EP3645479A1 - Four à chaux vertical - Google Patents

Four à chaux vertical

Info

Publication number
EP3645479A1
EP3645479A1 EP18823504.8A EP18823504A EP3645479A1 EP 3645479 A1 EP3645479 A1 EP 3645479A1 EP 18823504 A EP18823504 A EP 18823504A EP 3645479 A1 EP3645479 A1 EP 3645479A1
Authority
EP
European Patent Office
Prior art keywords
kiln
vertical shaft
lime
burner section
walls
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.)
Withdrawn
Application number
EP18823504.8A
Other languages
German (de)
English (en)
Other versions
EP3645479A4 (fr
Inventor
Christoffer GABRIELSSON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Faeltkalk AB
Original Assignee
Faeltkalk AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Faeltkalk AB filed Critical Faeltkalk AB
Publication of EP3645479A1 publication Critical patent/EP3645479A1/fr
Publication of EP3645479A4 publication Critical patent/EP3645479A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/005—Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any of groups F27B1/00 - F27B15/00
    • F27B17/0016—Chamber type furnaces

Definitions

  • the present disclosure relates to a vertical lime kiln, specifically adapted for allowing mobility and reuse of the material used for constructing the kiln.
  • the present disclosure also relates to a corresponding method for production of lime from limestone using such a kiln.
  • a rotary kiln In modern production of lime from limestone, a rotary kiln is used.
  • the rotary kiln is typically provided as a long, straight tubular steel vessel that is lined on the inside with refractory material.
  • the kiln rotates about an axis at an angle of a few degrees, such as 3° to 5°, to the horizontal, and rests on trunnions which rotate the tubular shell.
  • Limestones are introduced to a calcining chamber in the rotary kiln at the upper end and are decomposed, by heat, to calcium oxide which is extracted at the lower end.
  • a burner is attached at the lower end and burning fuel, such as oil, natural gas, or coal provides heat to the lower end of the calcining chamber of the rotary kiln. Combustion products and carbon dioxide are removed from the upper end of the rotary vessel.
  • a vertical lime kiln for the production of lime from limestone
  • the kiln comprising a base section arranged at a ground surface, a burner section arranged onto the base section, wherein the burner section comprises a horizontal passage for receiving a solid fuel material, and a vertical shaft arranged onto the burner section, having a rectangular shape and provided with laterally spaced walls, wherein the vertical shaft is adapted to receive the lime stone, wherein the burner section comprises a vertical opening extending upwardly into a lower portion of the vertical shaft, and the vertical shaft comprises a plurality of bridge portions extending over the horizontal passage, the bridge portions being arranged with a predefined spacing in the longitudinal direction of the horizontal passage there-between, such that heat generated within the burner section travels between the bridge sections and upwardly within the vertical shaft.
  • the lime kiln is formed as a rectangular, specifically simplifying the selection of material used for forming the vertical shaft of the lime kiln.
  • an e.g. wood fired burner section below the vertical shaft.
  • the plurality of bridge sections will allow the formation of a cavity, formed above the burning e.g. wood and below the limestones.
  • the bridge sections may in some embodiments of the present disclosure be formed from e.g. a plurality of firebricks as will be discussed below in relation to the detailed description of the present disclosure.
  • the vertical shaft may be formed as a sandwiched construction, preferably comprising an inner layer of firebricks.
  • the sandwiched construction may comprise a layer of autoclaved aerated concrete (AAC), such as AAC blocks or panels.
  • AAC autoclaved aerated concrete
  • the ACC blocks or panels are in accordance to the present disclosure arranged facing away from the vertical shaft, i.e. formed as an outer layer in relation to the firebricks of the walls of the vertical shaft.
  • the AAC blocks or panels allows for an improved stability of the walls of the vertical shaft. It should be understood that it in accordance to the present disclosure may be possible to stack the bricks and block without using any mortar. This allows the kiln to be easily dismounted and possibly reused at another site.
  • the sandwiched construction of the vertical walls are formed to comprise an inner layer of firebricks, a mid-layer of AAC and an outer layer of an insulation board.
  • a sheet metal material for further increasing the stability of the lime kiln, it may be possible to arrange e.g. a sheet metal material to enclose an outside surface of the walls of the vertical shaft.
  • a sheet metal material comprises a corrugated sheet metal.
  • the sheet metal material may in a possible embodiment be joined to the outside surface of the walls of the vertical shaft using some form of e.g. metal straps holding the sandwiched construction together.
  • an inlet portion of the burner section is preferred to allow an inlet portion of the burner section to extending horizontally outside of the vertical shaft.
  • Such an implementation typically allows for easy “pre-burning” of e.g. the firewood before “pushing” the now burning firewood into the horizontal passage of the burner section.
  • using two separate horizontal passages allows for e.g. an increased amount of e.g. firewood to be simultaneously burnt.
  • the lime kiln provided in accordance to the present disclosure may in some embodiments be equipped with one or a plurality of digital temperature sensors for e.g. continuously tracking a temperature within the kiln during operation of the kiln.
  • a first temperature sensor is arranged in a bottom section of the vertical shaft and a second temperature sensor is arranged at a top section of the vertical shaft.
  • a method for the production of lime from limestone comprising providing a vertical lime kiln as disclosed above, stacking limestones within the vertical shaft, and burning firewood within the burner section.
  • the process may further comprise tracking a temperature within the vertical shaft using the above mentioned first and second temperature sensors.
  • the temperature sensors may e.g. be connected to a computing device, such as a laptop, where temperature curves may be illustrated to a user of the kiln within a graphical user interface (GUI).
  • GUI graphical user interface
  • the GUI may also show predefined temperature profiles for the first and the second temperature sensor, allowing the user to adjust the amount of wood being burnt such that the measured temperatures stays within the predefined temperature profiles.
  • a removable roof at a top of the vertical shaft it may be provided a removable roof.
  • the removable roof may for example be formed from a super wood board.
  • the super wood board may be positioned such that a draft through the burner section and the vertical shaft is adjusted, thereby allowing control of the temperature within the vertical shaft.
  • Fig. 1 provides a conceptual illustration of a vertical lime kiln according to a currently preferred embodiment of the present disclosure.
  • the lime kiln 100 comprises a base section 102 arranged at a ground surface.
  • the lime kiln 100 further comprises a burner section 104 arranged onto the base section 102, where the burner section comprises a first 106 and a second 108 horizontal passage for receiving a burning fuel material, such as firewood.
  • a vertical shaft 110 arranged onto the burner section 104, where the vertical shaft 110 has a rectangular shape and is provided with laterally spaced walls 112, wherein the vertical shaft is adapted to receive a plurality of lime stones 114 that are to be arranged within the vertical shaft 110.
  • the plurality of limestones 114 are stacked onto a plurality of purposely provided bridge sections 116 extending over the horizontal passages 106, 108.
  • the burner section 104 further comprises a vertical opening extending upwardly into a lower portion of the vertical shaft 1 10, i.e. such that heat generated by e.g. wood being burnt within the horizontal passages 106, 108 is allowed to travel upwardly within the vertical shaft 110 for heating the limestones 114.
  • the plurality of bridge sections 116 are provided with a predefined spacing, e.g. at least 20 centimeters apart, thereby allowing a suitable cavity to be formed for giving the burning e.g. wood adequate spacing for optimizing the burning process.
  • the walls 112 of the vertical shaft 110 comprised with the lime kiln 100 may preferably be formed as a sandwiched construction, comprising a layer of firebricks 118 facing the inside of the vertical shaft.
  • the firebricks 118 are adapted to withstand a temperature around 1000 °C where the calcination process of limestone is taking place for the formation of lime (also referred to as quicklime or calcium oxide).
  • the sandwiched walls 112 further comprises a layer of autoclaved aerated concrete (AAC), such as AAC blocks 120.
  • AAC autoclaved aerated concrete
  • Both the firebricks 118 and the AAC blocks 120 are stacked as a stretcher bond or using any suitable known process for brickwork. It should however be understood that it in accordance to the present disclosure may be possible to stack the bricks and block without using any mortar. This allows the kiln 100 to be easily dismounted and reused at another site.
  • the ACC blocks 120 are arranged to facing away from the vertical shaft 100, i.e. formed as an outer layer in relation to the firebricks 118 of the walls 112 of the vertical shaft 110.
  • the sandwiched walls 112 further comprises a layer of a vermiculite board 122, providing insulation of the vertical shaft 110 during operation of the kiln 100.
  • a layer of a corrugated sheet metal 124 for "holding the walls 112 together", i.e. without having to resort to the use of e.g. mortar for securing bricks, blocks and boards together.
  • the walls 112 may be constructed slightly differently without departing from the scope of the present disclosure. That is, it may for example be possible to refrain from using the ACC blocks 120 and instead stacking e.g. two layers of firebricks 118. Similarly, it may in some embodiments be possible to refrain from using the vermiculite board 122, possibly with only a small reduction of the efficiency of the kiln 100. The same of course account for the corrugated sheet metal 124, which may be optional and/or may be substituted by another material.
  • the kiln 100 comprises a front section 126, providing an extension to the horizontal passages 106, 108. Passages 128, 130 of the front section 126 may be used for "starting" the firewood burning process. Once the firewood is sufficiently on fire, the now burning firewood may be "pushed" into the horizontal passages 106, 108 such that the heat generated will affect the limestones 114 such that the calcination process is performed.
  • an entry portion of the passages 128, 130 may be provided with heat resistant concrete slabs 132, 134. In some embodiments of the present disclosure this may be preferred to ensure that e.g. firebrick comprised with the front section 126 is kept safe from the extreme that may be generated at the entry portion of the passages 128, 130.
  • the concrete slabs 132, 134 are preferably adapted to have a width that matches a width of a plurality of firebricks stacked at the front section 126.
  • the front section 126 is provided with an outer layer of corrugated sheet metal.
  • the kiln 100 may optionally be provided with a "roof, e.g. provided as one or a plurality of heat resistant boards 136 that may be removably arranged onto a top surface 138 of the walls 112. It may, instead of using the heat resistant boards 136, alternatively be possible to use a layer of bricks for providing the "roof functionality".
  • a "roof e.g. provided as one or a plurality of heat resistant boards 136 that may be removably arranged onto a top surface 138 of the walls 112. It may, instead of using the heat resistant boards 136, alternatively be possible to use a layer of bricks for providing the "roof functionality".
  • the base section 102 is firstly formed, possibly comprising packed gravel at the ground surface. Secondly, the front section 126 and the burner section 104 and the bridge portions 116 are formed. Then the walls 112 are constructed, staring with stacking the firebricks 118 and then the ACC blocks 120.
  • the vermiculite boards 122 and the layer of the corrugated sheet metal 124 is arranged outside of the ACC blocks 120 for insulation and stability.
  • the limestones 114 are then carefully stacked on top of the bridge portions 116.
  • the stacking process starts by first placing the "largest” limestones 114 onto the bridge portions, followed by the "smaller” limestones 114. It is preferred to stack limestones 114 all the way up to the
  • a firewood fire is stated within the front section 126. Once the fire is burning "enough” the burning firewood is, as mentioned above, pushed inside of the horizontal passages 106, 108. The heat inside of the vertical shaft 110 will then increase, up to e.g. 1000 °C for calcination of the limestones 114.
  • the process may as be monitored using a plurality of temperature sensors (not shown) with the purpose to keep the temperature within the vertical shaft 110 within a predetermined temperature range.
  • the heat resistant boards 136 may be maneuvered at the top of the walls 112 for controlling the burn speed, thereby also controlling the temnperature within the vertical shaft 110.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

La présente invention concerne un four à chaux vertical, particulièrement conçu pour permettre une mobilité et une réutilisation du matériau utilisé pour construire le four. La présente invention concerne également un procédé correspondant de production de chaux à partir de calcaire à l'aide d'un tel four.
EP18823504.8A 2017-06-26 2018-05-23 Four à chaux vertical Withdrawn EP3645479A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1750819A SE540217C2 (en) 2017-06-26 2017-06-26 A vertical lime kiln
PCT/SE2018/050520 WO2019004892A1 (fr) 2017-06-26 2018-05-23 Four à chaux vertical

Publications (2)

Publication Number Publication Date
EP3645479A1 true EP3645479A1 (fr) 2020-05-06
EP3645479A4 EP3645479A4 (fr) 2020-11-11

Family

ID=63792072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18823504.8A Withdrawn EP3645479A4 (fr) 2017-06-26 2018-05-23 Four à chaux vertical

Country Status (3)

Country Link
EP (1) EP3645479A4 (fr)
SE (1) SE540217C2 (fr)
WO (1) WO2019004892A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111732351B (zh) * 2020-06-29 2021-08-20 东北大学 一种具有高低错落分布燃烧室的套筒石灰窑
CN112159125A (zh) * 2020-11-16 2021-01-01 开远市龙石工贸有限公司 自动给煤立式环保石灰窑
CN112556401B (zh) * 2020-12-09 2024-03-22 余松涛 一种旋转竖窑
CN113173717A (zh) * 2021-05-20 2021-07-27 江西福得利碳酸钙业有限责任公司 一种氧化钙生产工艺及其制备装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US375896A (en) * 1888-01-03 Limekiln
US3356351A (en) * 1965-09-10 1967-12-05 Union Carbide Corp Vertical lime kiln
EP1148311B1 (fr) * 2000-04-11 2005-11-09 Maerz Ofenbau AG Procédé de cuisson d'un matériau contenant des carbonates
CN201694956U (zh) * 2009-11-26 2011-01-05 承德阜泰工贸有限公司 一种新型气烧竖窑
CN204550403U (zh) * 2015-04-27 2015-08-12 淄博万方窑炉工程有限责任公司 环形石灰竖窑

Also Published As

Publication number Publication date
EP3645479A4 (fr) 2020-11-11
WO2019004892A1 (fr) 2019-01-03
SE1750819A1 (sv) 2018-05-02
SE540217C2 (en) 2018-05-02

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