WO2024257890A1 - Procédé de modification et appareil de modification de matière première - Google Patents

Procédé de modification et appareil de modification de matière première Download PDF

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Publication number
WO2024257890A1
WO2024257890A1 PCT/JP2024/080084 JP2024080084W WO2024257890A1 WO 2024257890 A1 WO2024257890 A1 WO 2024257890A1 JP 2024080084 W JP2024080084 W JP 2024080084W WO 2024257890 A1 WO2024257890 A1 WO 2024257890A1
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WO
WIPO (PCT)
Prior art keywords
raw material
modifier
conveyance equipment
amount
conveyance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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PCT/JP2024/080084
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English (en)
Inventor
Takashi Kikkawa
Natsumi Taniyama
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Kurita Water Industries Ltd
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Kurita Water Industries Ltd
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Publication of WO2024257890A1 publication Critical patent/WO2024257890A1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
    • C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/2135—Humidity, e.g. moisture content
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/2201—Control or regulation characterised by the type of control technique used
    • B01F35/2203—Controlling the mixing process by feed-forward, i.e. a parameter of the components to be mixed is measured and the feed values are calculated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71705—Feed mechanisms characterised by the means for feeding the components to the mixer using belts

Definitions

  • the present invention relates to a modification method and a modification apparatus of a raw material and, particularly, a raw material in a wet state.
  • raw materials mineral raw materials and fuel
  • raw materials piled up in a raw material yard may contain water sprayed as a dust control measure or rainwater and tend to have a high moisture percentage.
  • raw materials carried by a bulk carrier or the like are discharged and transported to a raw material yard, raw materials stored under a hatchway during carriage tend to have a high moisture percentage.
  • Raw materials are usually conveyed by a belt conveyor (hereinafter, BC) upon discharge or conveyance from the raw material yard.
  • BC belt conveyor
  • Such raw materials with a high moisture percentage cause adhesion, clogging, blocking, and the like during a conveyance process.
  • coal for a coke oven with a high moisture percentage causes a decline in bulk density in the coke oven.
  • a modifier may be used for the purpose of failure prevention.
  • the modifier is sprayed on the raw material on the BC and the raw material and the modifier are mixed in a transfer part to exert a modifying effect.
  • a method of adding a modifier a method in which a person determines a conveyance amount or out-of-cargo based on appearance and changes a setting of an amount of chemical injection.
  • the BC does not necessarily constantly convey a raw material and may repetitively start and stop according to operational circumstances and a conveyance amount is also not constant.
  • conveyance of the raw material stops during replacing of a hatch, cleaning of a bucket, fixing a meandering BC, and the like.
  • operations involving unloaders used in discharge may switch between an operation using one unloader and an operation using two unloaders and, what is more, since a capability of each unloader differs, a conveyance amount varies. Since a discharge takes several days, it is difficult to manually control chemical injection by constant monitoring.
  • PTL1 describes a method of modifying a mineral raw material by adding a modifier to the mineral raw material, the method including steps of: continuously measuring a moisture percentage of the mineral raw material to be conveyed; calculating an additive amount of the modifier based on the moisture percentage; and adding the modifier in the additive amount to the mineral raw material, wherein adding the modifier prevents at least any of adhesion of the mineral raw material to conveyance equipment, clogging of the mineral raw material in the conveyance equipment, ej ection of the mineral raw material inside the conveyance equipment and to outside of the conveyance equipment, and a decline in bulk density of the mineral raw material.
  • PTL2 describes a chemical solution-adding apparatus which adds a chemical solution to a hydrous bulk material while the hydrous bulk material containing ore and coal is being discharged from a cargo ship onto a belt conveyor using a grab bucket of a bridge crane or an unloader and the hydrous bulk material is being conveyed to a yard by the belt conveyor, wherein the chemical solution-adding apparatus includes: adding means which adds a chemical solution; additive amount control means which controls an additive amount of the chemical solution; a sensor which gathers information for determining start and stop of addition of the chemical solution; a chemical solution tank which stores the chemical solution to be added; and a conveyance hose which conveys the chemical solution from the chemical solution tank to the adding means.
  • a content of the modifier in the raw material is controlled to reach a predetermined concentration regardless of whether a conveyance amount of the raw material on the BC is large or small.
  • the modifier is sprayed so as to reach the predetermined concentration when the conveyance amount is small, an inconvenience may occur in which the modifier adheres to the BC or other equipment, promotes adhesion of the raw material, and causes the raw material to adhere to the BC or causes clogging or the like of the raw material in a transfer chute part.
  • PTL2 discloses adding a chemical solution when a BC is operational and cargo is present on the BC.
  • a modifier is sprayed so as to reach a predetermined concentration when an amount of the cargo on the BC is small, an inconvenience may occur in which the modifier adheres to the BC or other equipment, promotes adhesion of a raw material, and causes the raw material to adhere to the BC or causes clogging or the like of the raw material in a transfer chute part.
  • An object of the present invention is to provide a modification method and a modification apparatus of a raw material which can be automated, which is capable of controlling an additive amount of a modifier to a raw material to an appropriate amount, and which is capable of suppressing adhesion of the modifier and the raw material to conveyance equipment (such as a BC).
  • the present invention provides [1] to [5] below.
  • a method of modifying a raw material that is conveyed by conveyance equipment by adding a modifier to the raw material including steps of:
  • a modification apparatus which modifies a raw material that is conveyed by conveyance equipment by adding a modifier to the raw material
  • the modification apparatus including: a moisture percentage measurement apparatus which continuously measures a moisture percentage of the raw material that is conveyed; a raw material measurement apparatus which continuously measures an amount of the raw material that is present at a specific position of the conveyance equipment; a start/stop measurement apparatus which continuously measures start and stop of the conveyance equipment; a control apparatus which calculates, based on the moisture percentage, a target concentration (A) of the modifier in a modifier-added raw material when it is assumed that the modifier has been added to the raw material; a control apparatus which determines whether or not addition of the modifier is necessary based on the amount of the raw material and the start and stop; a control apparatus which calculates, based on the amount of the raw material and the target concentration, a target additive amount (B) per unit time of the modifier; and a modifier adding apparatus which adds the target additive amount (B) to the raw material when addition of the modifier is necessary but which does
  • the modification method and the modification apparatus of a raw material according to the present invention can be automated and are capable of controlling an additive amount of a modifier to a raw material to an appropriate amount and suppressing adhesion of the modifier and the raw material to conveyance equipment (such as a BC).
  • FIG. 1 is a schematic view for explaining a modification method and a modification apparatus of a raw material according to the present invention.
  • the expression "preventing adhesion of the raw material to conveyance equipment" is used to mean not only a case where there is no adhesion whatsoever but to also include cases where even if partial adhesion occurs, the adhesion is suppressed enough to prevent conveyance of the raw material from being interrupted.
  • the expression “continuously measure” means continuously performing measurements instead of performing just one measurement and, for example, refers to a case where a measurement of an amount of the conveyed raw material or a moisture percentage of the conveyed raw material is performed a plurality of times at specific intervals.
  • the modification method of a raw material according to the present invention is a method of modifying the raw material that is conveyed by conveyance equipment by adding a modifier to the raw material, the method including steps of:
  • the modification method of a raw material according to the present invention can be automated and is capable of controlling an additive amount of a modifier to a raw material to an appropriate amount and suppressing adhesion of the modifier and the raw material to conveyance equipment (such as a BC).
  • a raw material means a mineral raw material or a mineral fuel.
  • Types of the raw material are not particularly limited and examples include coal, iron ore, metal ore other than iron ore, dust, slag, sludge, coke, sintered ore, and limestone.
  • One of these raw materials may be used independently or a mixture of two or more of these raw materials may be used.
  • a shape, a size, and the like of the raw material are not particularly limited, from the perspective of preventing clogging, a form that is less likely to clog such as a granulated shape with a particle size of one particle ranging from 0.1
  • the "raw material" to be an object of adding a modifier is a wet raw material containing moisture.
  • a “wet raw material” refers to a raw material which is in a humid state and which can be conveyed by a belt conveyor. While the moisture percentage of wet raw materials cannot be categorically set due to different types and shapes of raw materials, for example, in a case of coal with a particle size ranging from 0.1 gm to 10 mm, the moisture percentage is more than 9 percent by mass and preferably 11 percent by mass or more. In addition, for example, in a case of iron ore with a particle size ranging from 0.1 m to 10 mm, the moisture percentage is more than 7 percent by mass and preferably 9 percent by mass or more.
  • An origin of the moisture in the raw material is not particularly limited and the moisture may derive from the raw material itself or derive from rain that the raw material had come into contact with during conveyance or storage or from water sprayed as means of dust prevention.
  • the modifier is not particularly limited and examples include organic substances such as a super absorbent resin, a water-soluble polymer compound, a surfactant, and an organic solvent and inorganic substances such as dust and slag created at ironworks, coal, coke, iron ore, diatomaceous earth, and ceramics.
  • organic substances such as a super absorbent resin, a water-soluble polymer compound, a surfactant, and an organic solvent and inorganic substances such as dust and slag created at ironworks, coal, coke, iron ore, diatomaceous earth, and ceramics.
  • organic substances such as a super absorbent resin, a water-soluble polymer compound, a surfactant, and an organic solvent and inorganic substances such as dust and slag created at ironworks, coal, coke, iron ore, diatomaceous earth, and ceramics.
  • One of these substances may be used independently or each of two or more of these substances may be used independently, or a mixture of two or more of these substances may be used.
  • the modifier preferably contains at least one substance selected from the group consisting of super absorbent resins and water-soluble polymer compounds and more preferably contains a super absorbent resin.
  • the modifier preferably contains a surfactant.
  • a super absorbent resin according to the present invention is a resin defined in JIS K7223 (1996) and JIS K7224 (1996) as "a resin which absorbs a large amount of water and swells and which is a hydrophilic substance with a cross-linked structure that absorbs water by coming into contact with the water and, once having absorbed water, hardly loses the water even under pressure".
  • a super absorbent resin absorbs a large amount of water and has superior water retention ability.
  • the super absorbent resin described above When the super absorbent resin described above is added to and mixed with a wet raw material, the super absorbent resin absorbs at least a part of the moisture in the raw material. Accordingly, since a moisture percentage of a surface of the raw material decreases, slidability of the raw material increases on a contact surface of the conveyance equipment, and the raw material becomes less likely to adhere to the contact surface, adhesion of the raw material to the conveyance equipment, clogging of the raw material in the conveyance equipment, ejection of the raw material inside the conveyance equipment and to outside of the conveyance equipment, and the like can be prevented. Note that adherence of the raw material with respect to the contact surface of the conveyance equipment need only be suppressed and an entire amount of moisture in the raw material need not be absorbed by the super absorbent resin.
  • the super absorbent resin may be either a synthetic resin-based type or a nature-derived type and is not particularly limited
  • examples of the super absorbent resin include poly(meth)acrylic acid, a poly(meth)acrylate salt, a poly(meth)acrylic acid ester, poly(meth)acrylamide, polyalkyleneimine, polyoxyalkylene, polymaleic acid, and a copolymer or the like containing any of the monomers constituting these super absorbent resins.
  • "(meth)acrylic” means acrylic or methacrylic.
  • Examples of a monomer that constitutes the poly(meth)acrylate salt include sodium (meth)acrylate, potassium (meth)acrylate, and ammonium (meth)acrylate.
  • Examples of a monomer that constitutes the poly(meth)acrylic acid ester include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, hydroxyethyl (meth)acrylate, and 2-ethylhexyl (meth) acrylate.
  • Examples of a monomer that constitutes polyalkyleneimine include ethyleneimine and methylethyleneimine .
  • Examples of a monomer that constitutes polyoxyalkylene include ethylene oxide and propylene oxide.
  • Examples of other monomers that constitute the copolymers include vinyl sulfonic acid, styrenesulfonic acid, N-ethyl(meth)acrylamide, and vinylpyridine.
  • One of these super absorbent resins may be used independently or two or more of these super absorbent resins may be used in combination. From the perspectives of availability, high water absorption power, and the like, polyacrylic acid or sodium polyacrylate is suitably used and sodium polyacrylate is particularly preferable.
  • the super absorbent resin may be used in combination with an additional water-absorbing agent.
  • additional water-absorbing agent examples include silica gel, zeolite, and activated carbon.
  • the super absorbent resin As properties of the super absorbent resin, from the perspective of uniformly mixing with raw material and the perspective of handleability or the like, the super absorbent resin has a granulated or powder form with a particle size equivalent or smaller than the particle size of the raw material.
  • a super absorbent resin with a particle size preferably ranging from 10 to 1000 pm and more preferably ranging from 50 to 600 pm is used.
  • a liquid super absorbent resin dispersed in an organic solvent may be used or a liquid super absorbent resin may be used.
  • the organic solvent is not particularly limited, a high-boiling point solvent such as an aromatic organic solvent is preferably used.
  • a content of the super absorbent resin in active substances of the modifier preferably ranges from 5 to 100 percent by mass, more preferably ranges from 50 to 100 percent by mass, and even more preferably ranges from 90 to 100 percent by mass.
  • a water-soluble polymer compound according to the present invention absorbs a large amount of water and has superior water retention ability. In the present invention, being water-soluble refers to dissolution of 0.01 g or more in 100 g of water at 25°C.
  • the water-soluble polymer compound When the water-soluble polymer compound is added to and mixed with a wet raw material, the water-soluble polymer compound absorbs at least a part of the moisture in the raw material. Accordingly, since a moisture percentage of a surface of the raw material decreases, slidability of the raw material increases on a contact surface of the conveyance equipment, and the raw material becomes less likely to adhere to the contact surface, adhesion of the raw material to the conveyance equipment, clogging of the raw material in the conveyance equipment, ejection of the raw material inside the conveyance equipment and to outside of the conveyance equipment, and the like can be prevented. Note that adherence of the raw material with respect to the contact surface of the conveyance equipment need only be suppressed and an entire amount of moisture in the raw material need not be absorbed by the water-soluble polymer compound.
  • the water-soluble polymer compound may be an artificially-produced synthetic high polymer compound or a naturally-present natural high polymer compound and examples of the water-soluble polymer compound include a synthetic water-soluble polymer compound, semisynthetic water-soluble polymer compound, and a natural water-soluble polymer compound.
  • Examples of the synthetic water-soluble polymer compound include polyvinyl alcohol, polyvinylpyrrolidone, or a salt thereof, polyethylene oxide, polyvinyl methyl ether; a copolymer of (meth)acrylic acid, (meth)acrylamide, maleic anhydride, maleic acid, maleic acid amide, maleic acid imide, itaconic acid, crotonic acid, or fumaric acid or a salt thereof, and the like.
  • Examples of the salt thereof include salts with alkaline metals such as sodium and potassium.
  • Examples of the semisynthetic water-soluble polymer compound include a cellulose derivative such as viscose, methylcellulose, cationized cellulose, ethylcellulose, carboxymethylcellulose, and hydroxypropylcellulose; a starch derivative such as pregelatinized starch, carboxyl starch, dialdehyde starch, cationic starch, dextrin, and British gum; cationized guar gum, anionized guar gum, and methylglycol chitosan.
  • a cellulose derivative such as viscose, methylcellulose, cationized cellulose, ethylcellulose, carboxymethylcellulose, and hydroxypropylcellulose
  • a starch derivative such as pregelatinized starch, carboxyl starch, dialdehyde starch, cationic starch, dextrin, and British gum
  • cationized guar gum anionized guar gum
  • methylglycol chitosan examples of the semisyn
  • Examples of the natural water-soluble polymer compound include starch, mannan, guar gum, xanthan gum, sodium alginate, locust bean gum, pectin, dextran, gelatin, rhamsan gum, and gellan gum.
  • the water-soluble polymer compound may be any of anionic, cationic, nonionic, and amphoteric. Among these properties, anionic and nonionic with reduced toxicity to fish are preferable and anionic is further preferable. [0026]
  • the water-soluble polymer compound is preferably a synthetic water-soluble polymer compound.
  • the synthetic water-soluble polymer compound a homopolymer or a copolymer containing one or two or more anionic monomers and nonionic monomers as constituents is suitable.
  • an anionic group include a carboxylic acid (monomer) such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid; a sulfonic acid (monomer) such as styrenesulfonic acid, vinylsulfonic acid, and 3-allyloxy-2-hydroxypropanesulfonic acid, and the like.
  • examples of a nonionic group include acrylamide (monomer) and methacrylamide (monomer).
  • an acrylic acid-based and/or acrylamide-based polymer is further preferable.
  • examples of the acrylic acid-based and/or acrylamide-based polymer include an acrylic acid homopolymer, an acrylamide homopolymer, an acrylic acid/acrylamide copolymer, a partial hydrolysate of polyacrylamide, acrylic acid/acrylamide/2-acrylamide-2-methylpropanesulfonic acid, acrylic acid/maleic acid copolymer or a salt thereof, and the like and one of these substances may be used independently or two or more of these substances may be used in combination.
  • an acrylic acid/acrylamide copolymer, an acrylamide homopolymer, and a partial hydrolysate of polyacrylamide are all high molecular-weight and can be suitably used in the applications according to the present invention.
  • a weight average molecular weight of the acrylamide-based or acrylic acid-based polymer preferably ranges from 1,000,000 to 10,000,000 and more preferably ranges from 5,000,000 to 9,000,000 (intrinsic viscosity method).
  • a content in units of acrylic acid when producing the acrylic acid-based and/or acrylamide-based polymer is preferably 5 mol percent or higher and more preferably ranges from 20 to 100 mol percent with respect to a total amount (100 mol percent) of the used monomers.
  • a state when using the water-soluble polymer compound is not particularly limited and the water-soluble polymer compound is suitably used in a powder form, a liquid form, or an emulsion form.
  • the water-soluble polymer compound is suitably used in a powder form or an emulsion form which enables the water-soluble polymer compound to be used without adding moisture to an object to be conveyed.
  • a water-soluble polymer compound in the form of a water/oil emulsion can be manufactured by known methods (for example, JP S52-039417 B and JP S51-41090 A).
  • One of the water-soluble polymer compounds may be used independently or two or more of the water-soluble polymer compounds may be used in combination.
  • An acrylic acid/acrylamide copolymer, an acrylamide homopolymer, and a partial hydrolysate of polyacrylamide are all high molecular-weight and can also be suitably used from the perspective of efficiently conveying the raw material.
  • a content of the water- soluble polymer compound in active substances of the modifier preferably ranges from 5 to 80 percent by mass, more preferably ranges from 20 to 60 percent by mass, and even more preferably ranges from 30 to 50 percent by mass.
  • an anionic surfactant such as a dialkyl sulfosuccinic acid (suitably with an alkyl group having 8 to 16 carbons) or a salt thereof (for example, a sodium salt, an ammonium salt, a potassium salt, or a triethanolamine salt), a polyoxyethylene alkyl ether sulfate salt, or sodium alkane sulfonate, a nonionic surfactant such as a polyoxyethylene (POE) addition polymer or a salt thereof, and the like can be used.
  • a dialkyl sulfosuccinic acid suitably with an alkyl group having 8 to 16 carbons
  • a salt thereof for example, a sodium salt, an ammonium salt, a potassium salt, or a triethanolamine salt
  • a polyoxyethylene alkyl ether sulfate salt for example, a sodium salt, an ammonium salt, a potassium salt, or a triethanolamine salt
  • a nonionic surfactant such
  • One of these surfactants may be used independently or two or more of these surfactants may be used in combination. From the perspective of improving the bulk density of the raw material, an anionic surfactant is preferable and sodium alkane sulfonate is more preferable.
  • a content of the surfactant in active substances of the modifier preferably ranges from 5 to 100 percent by mass, more preferably ranges from 10 to 50 percent by mass, and even more preferably ranges from 20 to 30 percent by mass.
  • Conveyance equipment refers to, for example, conveyance equipment in a conveyance line that feeds a raw material along a predetermined line from a storage location of the raw material such as a raw material yard to a facility where the raw material is to be used and includes functions for temporarily storing the raw material such as a chute, a hopper, and a silo.
  • the conveyance equipment according to the present invention refers to equipment for conveying raw material in a conveyance facility and is to be distinguished from carriage by a ship, a truck, or the like and from conveyance by a bucket or the like.
  • an effect of preventing adhesion of the raw material, clogging of the raw material, and ejection of the raw material in the conveyance equipment and to outside of the conveyance equipment can be produced at locations in the conveyance equipment where an inconvenience due to adhesion and clogging readily occurs such as piping, a belt conveyor, a conveyor chain, a chute, a hopper, a silo, and a coke oven.
  • a wet raw material is susceptible to problems such as adhesion, clogging, and ejection in such conveyance equipment and when a problem occurs, the problem must be solved after stopping an operation of a line which is time- and labor-consuming.
  • the present invention when an additive amount of a modifier is calculated and the modifier is added in the additive amount to a raw material according to the method described below, slidability of the raw material on a contact surface of the conveyance equipment improves and, since adhesion, clogging, and ejection of the raw material are prevented, the raw material can be efficiently conveyed without having to stop the operation of the line.
  • Step (1) is a step of continuously measuring a moisture percentage of the raw material that is conveyed.
  • an interval of measuring the moisture percentage is not particularly limited and differs according to a type, properties, a conveyance amount, and the like of the raw material, when coal is used as the raw material and the conveyance amount ranges from 1 to 20 t/minute, the moisture percentage is preferably measured once every 0.1 to 60 seconds. While an interval of measuring the conveyance amount is not particularly limited and differs according to a type, properties, a conveyance speed, and the like of the raw material, when coal is used as the raw material and the moisture percentage the coal ranges from 5 to 25 percent by mass, the conveyance amount is preferably measured once every 0.1 seconds to 1 minute.
  • a measurement using a non-contact moisture meter is preferable from the perspective of continuous measurement.
  • the non-contact moisture meter include an infrared moisture meter, a microwave moisture meter, a neutron moisture meter, an electrical resistance moisture meter, and a capacitance moisture meter.
  • CM710e manufactured by NDC Technologies and the like can be adopted.
  • a period of time required to measure the moisture percentage of the raw material preferably ranges from 0.1 to 60 seconds and more preferably ranges from 1 to 10 seconds from the perspectives of productivity and adding the modifier in an appropriate additive amount corresponding to the moisture percentage of the raw material.
  • Step (2) is a step of continuously measuring an amount of the raw material that is present at a specific position of the conveyance equipment.
  • Examples of a method of measuring an amount of the raw material include load measurement apparatuses such as a load-cell load measurement apparatus and a Merrick load measurement apparatus and distance measurement apparatuses such as an optical distance measurement apparatus, a millimeter-wave distance measurement apparatus, and an ultrasonic distance measurement apparatus.
  • load measurement apparatuses such as a load-cell load measurement apparatus and a Merrick load measurement apparatus
  • distance measurement apparatuses such as an optical distance measurement apparatus, a millimeter-wave distance measurement apparatus, and an ultrasonic distance measurement apparatus.
  • an amount of the raw material is calculated based on a mass value of the raw material on the belt conveyor and a movement speed of the belt conveyor.
  • a distance sensor is installed in an upper part of the belt conveyor, and an amount of the raw material is calculated based on a difference between a distance from the distance sensor to a bottom part of the belt conveyor and a distance between the distance sensor and the raw material on the belt conveyor.
  • a period of time required to measure the amount of the raw material preferably ranges from 0.1 to 60 seconds and more preferably ranges from 1 to 10 seconds from the perspectives of productivity and adding the modifier in an appropriate additive amount corresponding to the moisture percentage of the raw material.
  • a position where the moisture percentage of the conveyed raw material and the amount of the raw material are measured is preferably installed on an upstream side of a position where the modifier is added and in a vicinity of the conveyance equipment such as a belt conveyor which conveys the raw material that is a measurement object.
  • the measurement of the moisture percentage may be performed before the measurement of the conveyance amount, the measurement of the amount of the raw material may be performed before the measurement of the moisture percentage, or the measurements of the moisture percentage and the amount of the raw material may be performed concurrently.
  • the measurement of the amount of the raw material is preferably performed before the measurement of the moisture percentage.
  • Step (3) is a step of continuously measuring start and stop of the conveyance equipment.
  • Examples of a method of measuring start and stop include a Merrick belt scale, a roller encoder, a belt conveyor operation motor, and current measurement using a vibration sensor or a sound sensor.
  • Step (4) is a step of calculating, based on the moisture percentage, a target concentration (A) of the modifier in a modifier-added raw material when it is assumed that the modifier has been added to the raw material.
  • the target concentration (A) of the modifier differs according to a type, properties, and the like of the raw material, for example, when the raw material is coal, since a moisture percentage of coal of less than approximately 7 percent by mass hardly causes adhesion of the raw material to the conveyance equipment, clogging of the raw material inside the conveyance equipment, and ejection of the raw material inside the conveyance equipment and to outside of the conveyance equipment and also attains relatively high bulk density, the target concentration (A) of the modifier is calculated as 0 percent by mass. In other words, excessive addition of the modifier is suppressed.
  • the target concentration (A) of the modifier can be calculated based on a reference value that is a suitable concentration of the modifier with respect to the moisture percentage of the raw material obtained in advance by a simulation or a calibration curve and on a measurement result of the moisture percentage of coal. The higher the moisture percentage of coal, the higher the target concentration (A) of the modifier.
  • the target concentration (A) of the modifier is calculated based on a measurement result of the moisture percentage of the raw material in the present invention, the addition of the modifier can be prevented from becoming excessive and a modifier cost can be reduced. Furthermore, when the reference value that is a suitable concentration of the modifier with respect to the moisture percentage of the raw material obtained in advance by a simulation or a calibration curve and the measurement result of the moisture percentage of the raw material significantly differ from each other, a determination that the raw material is not present on a belt conveyor can be made and the addition of the modifier can be stopped. [0039]
  • the target concentration (A) of the modifier differs according to a type and characteristics of the raw material and is calculated based on the moisture percentage of the raw material or based on the moisture percentage and the conveyance amount of the raw material
  • the target concentration (A) of the modifier preferably ranges from 0.001 to 50 percent by mass, more preferably ranges from 0.005 to 5 percent by mass, and even more preferably ranges from 0.01 to 0.5 percent by mass.
  • the target concentration (A) of the modifier preferably ranges from 0.001 to 50 percent by mass, more preferably ranges from 0.005 to 5 percent by mass, and even more preferably ranges from 0.01 to 0.5 percent by mass.
  • the target concentration (A) of the modifier preferably ranges from 0.001 to 50 percent by mass, more preferably ranges from 0.005 to 5 percent by mass, and even more preferably ranges from 0.05 to 0.5 percent by mass.
  • the target concentration (A) of the modifier preferably ranges from 0.001 to 50 percent by mass, more preferably ranges from 0.005 to 5 percent by mass, and even more preferably ranges from 0.01 to 0.5 percent by mass.
  • the target concentration (A) of the modifier preferably ranges from 0.001 to 50 percent by mass, more preferably ranges from 0.005 to 5 percent by mass, and even more preferably ranges from 0.01 to 0.5 percent by mass.
  • the target concentration (A) of the modifier preferably ranges from 0.001 to 50 percent by mass, more preferably ranges from 0.005 to 5 percent by mass, and even more preferably ranges from 0.05 to 0.5 percent by mass.
  • Step (5) is a step of determining whether or not addition of the modifier is necessary based on the start and stop and an amount of the raw material.
  • step (5) the following determinations are made. - (a) Start/stop is start and amount of the raw material is a predetermined amount or more: added.
  • a chemical injection of the modifier is performed either at several points or continuously with respect to a width direction of the belt conveyor since the chemical injection of the modifier is desirably performed so that the modifier becomes uniform with respect to the raw material, a width of the raw material is narrow and causes the modifier to be directly added onto the BC when the conveyance amount is less than the predetermined amount.
  • the modifier is not added in the case of (b) described above, the inconvenience can be avoided and an amount of use of the modifier can be suppressed.
  • Step (6) is a step of calculating, based on the amount of the raw material and the target concentration (A) of the modifier, a target additive amount (B) per unit time of the modifier.
  • the modifier can be added to the raw material without an excess or a deficiency.
  • the target additive amount (B) (ton/hr) per unit time of the modifier can be calculated using the following equation.
  • a conveyance apparatus such as a belt conveyor is an apparatus the conveyance speed of which cannot be changed
  • Z assumes a specific value.
  • the conveyance speed of the conveyance apparatus such as a belt conveyor can be changed, the conveyance speed is preferably measured with a conveyance speed measurement apparatus.
  • the modifier is not added when it is determined in step (5) that the modifier is not to be added.
  • Step (7) is a step of adding the target additive amount (B) of the modifier to the raw material when addition of the modifier is necessary but not adding the target additive amount (B) of the modifier to the raw material when addition of the modifier is not necessary.
  • the modifier can be added to the raw material without an excess or a deficiency only when it is necessary to add the modifier.
  • a position where the modifier is added to the raw material is preferably a position where the modifier can be added after the measurement position of the moisture percentage of the raw material and the measurement position of the amount of the raw material
  • the position is not particularly limited and may be midway during the conveyance of the raw material by the conveyance apparatus such as a belt conveyor or after the conveyance of the raw material.
  • the position where the modifier is added is preferably in a vicinity of the measurement positions of the moisture percentage and the amount of the raw material.
  • the modifier is preferably added at a position on an upstream side of the transfer part of the belt conveyor.
  • the modifier is preferably sprayed from above the raw material being conveyed by a belt conveyor or the like.
  • the modifier may be added at one location or added at two or more locations.
  • each component may be independently added or a mixture prepared in advance may be added.
  • a mixture of two or more components prepared in advance may be added, or after adding a mixture of two or more components prepared in advance, one component may be independently added.
  • a timing at which the modifier is added to the raw material after a measurement of the moisture percentage of the raw material is preferably within 10 minutes, more preferably within 5 minutes, and even more preferably within 1 minute.
  • the modifier can preferably be added in accordance with the fluctuation.
  • the raw material and the modifier are preferably mixed after adding the modifier to the raw material.
  • a mixing method is not particularly limited, a method which causes the raw material and the modifier to be mixed uniformly and which yields a mixture in which the raw material and the modifier are in contact with each other is preferable.
  • Examples of the mixing method include mixing at a transfer part of a belt conveyor and mixing using a kneader or heavy machinery.
  • the modifier can also be mixed by adding the modifier to a predetermined container storing the raw material and stirring and mixing the container.
  • the bulk density of the raw material to which the modifier has been added differs according to a type and characteristics of the raw material, from the perspective of contributing to the improvement of productivity of industrial products using the raw material, the bulk density is preferably more than 700 kg/m 3 and more preferably more than 750 kg/m 3 .
  • the modification apparatus is a modification apparatus which modifies a raw material that is conveyed by conveyance equipment by adding a modifier to the raw material, the modification apparatus including: a moisture percentage measurement apparatus which continuously measures a moisture percentage of the raw material that is conveyed; a raw material measurement apparatus which continuously measures an amount of the raw material that is present at a specific position of the conveyance equipment; a start/stop measurement apparatus which continuously measures start and stop of the conveyance equipment; a control apparatus which calculates, based on the moisture percentage, a target concentration (A) of the modifier in a modifier-added raw material when it is assumed that the modifier has been added to the raw material; a control apparatus which determines whether or not addition of the modifier is necessary based on the amount of the raw material and the start and stop; a control apparatus which calculates, based on the amount of the raw material and the target concentration, a target additive amount (B) per unit time of the modifier; and a modifier adding apparatus which adds the target additive amount (B) to the raw material when addition of
  • the start/stop measurement apparatus may be either a start/stop binary apparatus which measures whether the conveyance equipment has started or stopped and which does not measure a movement speed or a movement speed measurement apparatus of the conveyance equipment.
  • Fig. 1 is a schematic view illustrating an example of the modification apparatus according to an embodiment.
  • a start/stop measurement apparatus 2 is installed on a belt conveyor 1.
  • a raw material measurement apparatus 3 which continuously measures an amount of the raw material that is present at a specific position of the belt conveyor 1 and a moisture percentage measurement apparatus 4 are installed above the belt conveyor 1.
  • a modifier adding apparatus 6 is installed on a downstream side in a conveying direction of the apparatuses 2 to 4.
  • a control apparatus 5 is connected via wiring or wirelessly to the start/stop measurement apparatus 2, the raw material measurement apparatus 3, the moisture percentage measurement apparatus 4, and the modifier adding apparatus 6.
  • Automation can be realized by using the modification apparatus and preferably by implementing the modification method of a raw material according to the embodiment described earlier, an additive amount of a modifier to the raw material can be controlled to an appropriate amount, and adhesion of the modifier and the raw material to conveyance equipment (such as a BC) can be suppressed.
  • conveyance equipment such as a BC

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Control Of Conveyors (AREA)
  • Auxiliary Methods And Devices For Loading And Unloading (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Coke Industry (AREA)

Abstract

L'invention concerne un procédé de modification d'une matière première qui est transportée par un équipement de transport par ajout d'un modificateur à la matière première. Ledit procédé de modification comprend les étapes consistant à : (1) mesurer en continu un pourcentage d'humidité de la matière première ; (2) mesurer en continu une quantité de la matière première qui est présente à une position spécifique de l'équipement de transport ; (3) mesurer en continu le démarrage et l'arrêt de l'équipement de transport ; (4) calculer, sur la base du pourcentage d'humidité, une concentration cible (A) du modificateur dans une matière première ajoutée par un modificateur lorsqu'il est supposé que le modificateur a été ajouté à la matière première ; (5) déterminer si l'ajout du modificateur est nécessaire ou non sur la base de la quantité de la matière première et du démarrage et de l'arrêt ; (6) calculer, sur la base de la quantité de la matière première et de la concentration cible (A), une quantité d'additif cible (B) par unité de temps du modificateur ; et (7) ajouter la quantité d'additif cible (B) à la matière première lorsque l'ajout du modificateur est nécessaire.
PCT/JP2024/080084 2023-06-13 2024-06-11 Procédé de modification et appareil de modification de matière première Pending WO2024257890A1 (fr)

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Application Number Priority Date Filing Date Title
JP2023097140A JP2024178756A (ja) 2023-06-13 2023-06-13 原料の改質方法及び改質装置
JP2023-097140 2023-06-13

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WO2024257890A1 true WO2024257890A1 (fr) 2024-12-19

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JP (1) JP2024178756A (fr)
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5141090A (fr) 1974-08-07 1976-04-06 American Cyanamid Co
JPS5239417B1 (fr) 1971-07-12 1977-10-05
WO2015151524A1 (fr) * 2014-04-01 2015-10-08 Ｊｆｅスチール株式会社 Procédé de traitement de matériau en vrac contenant de l'eau, et dispositif d'ajout de floculant au matériau en vrac contenant de l'eau
JP2015196573A (ja) * 2014-04-01 2015-11-09 Ｊｆｅスチール株式会社 含水バラ物への薬液添加装置
JP2021167442A (ja) * 2020-04-09 2021-10-21 栗田工業株式会社 鉱物原料の改質方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5239417B1 (fr) 1971-07-12 1977-10-05
JPS5141090A (fr) 1974-08-07 1976-04-06 American Cyanamid Co
WO2015151524A1 (fr) * 2014-04-01 2015-10-08 Ｊｆｅスチール株式会社 Procédé de traitement de matériau en vrac contenant de l'eau, et dispositif d'ajout de floculant au matériau en vrac contenant de l'eau
JP2015196573A (ja) * 2014-04-01 2015-11-09 Ｊｆｅスチール株式会社 含水バラ物への薬液添加装置
JP2021167442A (ja) * 2020-04-09 2021-10-21 栗田工業株式会社 鉱物原料の改質方法
EP4134411A1 (fr) * 2020-04-09 2023-02-15 Kurita Water Industries Ltd. Procédé de modification d'une matière première minérale

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