US3589314A - Method and device for pressure spraying and burning a coal dust-water mixture - Google Patents

Method and device for pressure spraying and burning a coal dust-water mixture Download PDF

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Publication number
US3589314A
US3589314A US841060A US3589314DA US3589314A US 3589314 A US3589314 A US 3589314A US 841060 A US841060 A US 841060A US 3589314D A US3589314D A US 3589314DA US 3589314 A US3589314 A US 3589314A
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United States
Prior art keywords
mixture
supply line
water
coal dust
pressure
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Expired - Lifetime
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US841060A
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English (en)
Inventor
Herbert Tratz
Aribert Fracke
Eduard Weber
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Siemens AG
Siemens Corp
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Siemens Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F23D1/005—Burners for combustion of pulverulent fuel burning a mixture of pulverulent fuel delivered as a slurry, i.e. comprising a carrying liquid

Definitions

  • Method of pressure spraying and burning a coal dust-water mixture includes heating the coal dust and the water contained in the mixture, prior to discharging the same from a nozzle at a pressure of several. atmospheres excess pressure, to a temperature that 111 ust below the water-vaponzmg chum 7 Drawing Figs temperature corresponding to the pressure produced up- [52] US. '110/28, stream of the nozzle so that the water is pressure-relieved and t 43 ll 1 l, 431/208, 431/210 vaporizes directly after passing through the nozzle; and device [51] Int. Cl. F23b 7/00 for carrying out the method.
  • we provide method of pressure spraying and burning a coal dust-water mixture which comprises heating the coal dust and the water contained in the mixture, prior to discharging the same from a nozzle at a pressure of several atmospheres excesspressure, to a temperature lying just below the water vaporizing temperature corresponding to the pressure produced upstream of the nozzle so that the water is pressure-relieved and vaporizes directly after passing through the nozzle.
  • the mixture supplied under pressure is heated to a temperature at which the water actually does not vaporize. Only directly after the water leaves the nozzle is it abruptly pressure-relieved and vaporized. High turbulence is simultaneously achieved thereby.
  • the device for carrying out the method of our invention comprises a supply line for the coal dust-water mixture, means for heating the supply line, and orifice means having an axial bore located at the outlet end of the supply line.
  • the nozzle proper is formed of a supply line for a coal dust-water mixture, and a plate closing the supply line at the outlet end thereof, a portion of the supply line adjacent the plate being formed with radical bores. The coal dust-water mixture is thereby blown radially out of the nozzle.
  • FIG. 1 is a schematic view of a novel system for carrying out the method of our invention
  • FIGS. 2 and 3 are fragmentary schematic views of the system of FIG. 1 showing respective modifications therein;
  • FIG. 4 is a longitudinal sectional view of a burner nozzle with an axial bore forming part of the systems of FIGS. 1 to 3;
  • FIG. 5 is a view corresponding to that of FIG. 4 showing a modified burner nozzle with radial bores
  • FIG. 6a is another view corresponding to those of FIGS. 4 and 5 showing a flow twisting member received in the burner nozzle;
  • FIG. 6b is a cross sectional view of FIG. 6a, taken along the line VI B-VI B in the direction of the arrows.
  • coal dust-water mixture is delivered directly from the mine or a central storage depot to the respective power plant.
  • FIG. 1 there is shown a system in a power plant wherein the coal dust-water mixture 3 is accumulated in a funnel-shaped supply vessel 1 from which it is to be supplied to the burners of a power plant upon demand.
  • the supply vessel 1 is advantageously provided with a stirring or agitating mechanism 2 by means of which the mixture is stirred either continuously or at specific time intervals in order to prevent settling of the coal dust.
  • the coal dust-water mixture 3 is withdrawn from the lower end of the supply vessel 1, as shown in FIG. 1, through transport line 4.
  • a pump 5 connected in the transport line 4 provides the mixture with the required transporting and injection pressure.
  • an adjustable valve 6 for additionally controlling the flow throughput or flow rate of the mixture.
  • the coal dust-water mixture 3 is then preheated in a heat exchanger 9 heated generally with superheated steam. Suitable inlet and outlet lines 10 and 11 are connected to the heat exchanger for circulating the required superheated steam therethrough. After leaving the heat exchanger 9, the coal dust-water mixture is then con ducted to a fuel nozzle 12 proper wherein it is heated in the embodiment of FIG. 1 by superheated steam passing through a heating tube 13, to a temperature which is not quite as high as the evaporating temperature of the water of the mixture corresponding to the respective pressure thereat. An inlet 14 and outlet 15 are connected to the heating tube 13 for circulating the superheated steam therethrough. A manometer 14 is connected to the transport line 4 behind.
  • the heating tube 13 for monitoring the pressure of the coal gaswater mixture heated in the heating tube 13.
  • the heated mixture then flows through an opening at the end of the nozzle 12 into a combustion chamber defined by walls 17.
  • the water entrained in the mixture abruptly expands due to the sudden reduction in pressure.
  • the volume increase accompanying the partial vaporization of the water causes the discharging liquid jet to be broken apart and to be very finely atomized or comminuted.
  • the coal dust-water mixture downstream of the heat exchanger 9 is heated in a nozzle 12 by a suitable electric heating device surrounding the nozzle 12.
  • a temperature sensing or measuring device 19 located downstream of the electric heater 18 controls a regulated voltage source 20 providing energy to the heater l8.
  • the final heating of the coal dust-water mixture is effected by superheated steam in a heating tube 13 as in the embodiment of FIG. 1.
  • the preheating of the mixture is not carried out in a separate heat exchanger such as in the embodiments of FIGS. 1 and 2, but rather the transport line 4 is passed over a heating surface 21 disposed in the boiler or combustion chamber 28 so that the coal dust-water mixture is preheated directly by the flue gases.
  • FIG. 4 A special embodiment of the burner of the invention is shown in FIG. 4 similar to that of FIG. 2 wherein the nozzle 12 is heated by an electric heater 18.
  • the coal dust-water mixture 3 is heated in the nozzle 12 of FIG.
  • a nozzle tube 12 is closed at its outlet end by a plate 22 having an axial bore 23 formed therein. After passing through this bore or orifice 23, the water entrained in the mixture expands due to the abrupt pressure release so that the discharging liquid jet is torn apart and very finely comminuted.
  • coal dust-water mixture be pressurerelieved only after it has been discharged from the nozzle 12. Evaporation and consequent drying of the coal dust-water mixture in the bore or orifice 23 proper of the nozzle is thereby prevented. For this reason the length of the bore must be kept very short. Due to the high heat of vaporization which is produced, the coal dust particles are moreover warmer than the surrounding atmosphere after the mixture has been pressure-relieved and expanded so that any water droplets clinging to the surface of the respective coal dust particles are largely evaporated afterwards. Desirable prerequisites for the ignition of the coal dust is thereby imparted thereto.
  • the burner nozzle 12 is heated by superheated steam as in the embodiments of FIGS. 1 and 3.
  • the superheated steam is conducted in countcrflow through an inlet line 14 into the heating tube 13 proper and is discharged therefrom through an outlet line 15.
  • the nozzle tube 12 is closed at the end thereof by a face plate 24.
  • radial bores 25 are formed in the nozzle tube 12 adjacent the face plate 24 so that the coal dust-water mixture is blown laterally or transversely out of the nozzle 12.
  • FIGS. 6a and 6b there is shown a burner nozzle corresponding substantially to that of FIG.
  • the twisting device is spaced from the radial bores 25 and is formed of inclined guide vanes 26 extending from an axially oriented flow body 27 to the inner wall surface of the nozzle 12.
  • Method of pressure spraying and burning a coal dustwater mixture which comprises heating the coal dust and the water contained in the mixture, prior to discharging the same from a nozzle at a pressure of several atmospheres excess pressure, to a temperature that is just below the water-vaporizing temperature corresponding to the pressure produced upstream of the nozzle, so that the water is pressure-relieved and vagorizesdirectly after passing through the nozzle.
  • Device for pressure spraying and burning a coal dustwater mixture comprising a supply line for the coal dust-water mixture, means for heating said supply line to a temperature just below vaporizing temperature of the water in said supply line, and orifice means at an end of said supply line for discharging the coal dust-water mixture in a spray.
  • said orifice means comprises a plate closing said end of said supply line, said plate being formed with an axial bore.
  • Device according to claim 2 including a flow-twisting device received in said supply line upstream of said orifice means.
  • System of pressure spraying and burning a coal dustwater mixture comprising coal dust-water mixture supply means, a supply line connecting said supply means to a combustion chamber, pump means disposed in said supply line for pressurizing the mixture therein, means for heating the mixture in the supply line to a temperature just below the vaporizing temperature of water at the prevailing pressure of the mixture in the supply line, and orifice means at the downstream end of said supply for discharging the mixture in pressure-relieved and vaporized form into said combustion chamber.
  • System according to claim 6 including a return line branching off from said supply line at a location downstream of said pump for returning excess mixture to said supply means.
  • said heating means comprises a heat exchanger traversable by superheated steam.
  • said heating means comprises an electric heater located adjacent said supply line.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
US841060A 1968-07-13 1969-07-11 Method and device for pressure spraying and burning a coal dust-water mixture Expired - Lifetime US3589314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681751700 DE1751700A1 (de) 1968-07-13 1968-07-13 Verfahren und Einrichtung zur Druckzerstaeubung und Verbrennung von Kohlenstaub-Wassergemischen

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US (1) US3589314A (fr)
BE (1) BE734277A (fr)
DE (1) DE1751700A1 (fr)
GB (1) GB1223369A (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682114A (en) * 1969-10-10 1972-08-08 Steinkohlen Elektrizitot Ag Method of atomizing a coal/water suspension and system therefor
US3876363A (en) * 1974-01-02 1975-04-08 Aqua Chem Inc Atomizing method and apparatus
US3938933A (en) * 1973-06-11 1976-02-17 Armas G C Fuel oil burning method
US4211174A (en) * 1978-08-07 1980-07-08 Whirlpool Corporation Wet oxidation of coal for generation of heat energy
EP0038011A1 (fr) * 1980-04-14 1981-10-21 Forschungszentrum Jülich Gmbh Brûleur pour la combustion d'une suspension de charbon dans l'eau
US4296888A (en) * 1980-02-28 1981-10-27 General Motors Corporation Powdered coal air dispersion nozzle
US4335684A (en) * 1979-04-16 1982-06-22 Thermo Electron Corporation Micronized coal-water fuel slurry for reciprocating internal-combustion engines
US4359861A (en) * 1978-01-17 1982-11-23 John Musacchia Gas turbine
US4558664A (en) * 1984-10-19 1985-12-17 The United States Of America As Represented By The United States Department Of Energy Superheated fuel injection for combustion of liquid-solid slurries
US5224851A (en) * 1992-05-08 1993-07-06 Shell Oil Company Low NOx burner
US5263850A (en) * 1992-02-05 1993-11-23 Boston Thermal Energy Corporation Emission control system for an oil-fired combustion process
US5380342A (en) * 1990-11-01 1995-01-10 Pennsylvania Electric Company Method for continuously co-firing pulverized coal and a coal-water slurry
US5513583A (en) * 1994-10-27 1996-05-07 Battista; Joseph J. Coal water slurry burner assembly
US5967061A (en) * 1997-01-14 1999-10-19 Energy And Environmental Research Corporation Method and system for reducing nitrogen oxide and sulfur oxide emissions from carbonaceous fuel combustion flue gases
US5988081A (en) * 1997-07-22 1999-11-23 Energy & Environmental Research Corporation Method and system for the disposal of coal preparation plant waste coal through slurry co-firing in cyclone-fired boilers to effect a reduction in nitrogen oxide emissions
US6164956A (en) * 1997-02-11 2000-12-26 Ge Energy & Environmental Research Corporation System and method for removing ash deposits in a combustion device
US7140873B1 (en) * 1999-03-01 2006-11-28 Michael J. House Multi all fuel processor system and method of pretreatment for all combustion devices
US20080182213A1 (en) * 2007-01-31 2008-07-31 Radek Masin Waste oil burning system
CN102250642A (zh) * 2011-06-03 2011-11-23 中国中煤能源股份有限公司 干煤粉湿式上料方法及使用该方法的上料系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8413622D0 (en) * 1983-06-16 1984-07-04 Boc Group Plc Combustion and burners

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229651A (en) * 1962-06-06 1966-01-18 Consolidation Coal Co Process for burning different sized particulate material in a pulverized fuel burner
US3357375A (en) * 1965-08-17 1967-12-12 Prenco Mfg Company Incineration of industrial waste, and apparatus
US3494309A (en) * 1968-07-08 1970-02-10 Prenco Mfg Co Nozzle means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229651A (en) * 1962-06-06 1966-01-18 Consolidation Coal Co Process for burning different sized particulate material in a pulverized fuel burner
US3357375A (en) * 1965-08-17 1967-12-12 Prenco Mfg Company Incineration of industrial waste, and apparatus
US3494309A (en) * 1968-07-08 1970-02-10 Prenco Mfg Co Nozzle means

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682114A (en) * 1969-10-10 1972-08-08 Steinkohlen Elektrizitot Ag Method of atomizing a coal/water suspension and system therefor
US3938933A (en) * 1973-06-11 1976-02-17 Armas G C Fuel oil burning method
US3876363A (en) * 1974-01-02 1975-04-08 Aqua Chem Inc Atomizing method and apparatus
US4359861A (en) * 1978-01-17 1982-11-23 John Musacchia Gas turbine
US4211174A (en) * 1978-08-07 1980-07-08 Whirlpool Corporation Wet oxidation of coal for generation of heat energy
US4335684A (en) * 1979-04-16 1982-06-22 Thermo Electron Corporation Micronized coal-water fuel slurry for reciprocating internal-combustion engines
US4296888A (en) * 1980-02-28 1981-10-27 General Motors Corporation Powdered coal air dispersion nozzle
EP0038011A1 (fr) * 1980-04-14 1981-10-21 Forschungszentrum Jülich Gmbh Brûleur pour la combustion d'une suspension de charbon dans l'eau
US4444126A (en) * 1980-04-14 1984-04-24 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Apparatus for combustion of a suspension of coal particles in water
US4558664A (en) * 1984-10-19 1985-12-17 The United States Of America As Represented By The United States Department Of Energy Superheated fuel injection for combustion of liquid-solid slurries
US5380342A (en) * 1990-11-01 1995-01-10 Pennsylvania Electric Company Method for continuously co-firing pulverized coal and a coal-water slurry
US5263850A (en) * 1992-02-05 1993-11-23 Boston Thermal Energy Corporation Emission control system for an oil-fired combustion process
US5224851A (en) * 1992-05-08 1993-07-06 Shell Oil Company Low NOx burner
US5513583A (en) * 1994-10-27 1996-05-07 Battista; Joseph J. Coal water slurry burner assembly
US5967061A (en) * 1997-01-14 1999-10-19 Energy And Environmental Research Corporation Method and system for reducing nitrogen oxide and sulfur oxide emissions from carbonaceous fuel combustion flue gases
US6164956A (en) * 1997-02-11 2000-12-26 Ge Energy & Environmental Research Corporation System and method for removing ash deposits in a combustion device
US5988081A (en) * 1997-07-22 1999-11-23 Energy & Environmental Research Corporation Method and system for the disposal of coal preparation plant waste coal through slurry co-firing in cyclone-fired boilers to effect a reduction in nitrogen oxide emissions
US6152054A (en) * 1997-07-22 2000-11-28 Ge Energy And Environmental Research Corp. Method and system for the disposal of coal preparation plant waste coal through slurry co-firing in cyclone-fired boilers to effect a reduction in nitrogen oxide emissions
US7140873B1 (en) * 1999-03-01 2006-11-28 Michael J. House Multi all fuel processor system and method of pretreatment for all combustion devices
US20080182213A1 (en) * 2007-01-31 2008-07-31 Radek Masin Waste oil burning system
CN102250642A (zh) * 2011-06-03 2011-11-23 中国中煤能源股份有限公司 干煤粉湿式上料方法及使用该方法的上料系统

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Publication number Publication date
DE1751700A1 (de) 1970-08-27
BE734277A (fr) 1969-11-17
GB1223369A (en) 1971-02-24

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