Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L9/00—Treating solid fuels to improve their combustion

Definitions

• the present invention relates to a method for demineralizing coal, and more particularly to a method for efficiently separating ⁇ components mixed in pulverized coal to obtain pulverized coal with high purity.
• pulverized coal is carbon particles, in which particles such as SiO 2 , CaO, and AI 2 O 3, that is, ash particles, are mixed as foreign matter.
• particles such as SiO 2 , CaO, and AI 2 O 3
• pulverized coal is put into water. The ash is separated and removed using the lipophilicity of the carbon particles, but the workability is poor with this method. Is difficult to adjust.
• An object of the present invention is to provide a method of demineralizing coal which has good workability and can easily adjust the ash separation accuracy.
• the present invention transports pulverized coal as an object to be treated in a stream of non-oxidizing gas, and operates the temperature and humidity of the non-oxidizing gas loaded with pulverized coal during operation.
• the ash particles are collected and separated by the difference in the intrinsic resistance of the carbon particles and the ash particles in the electrostatic precipitator, and the dry ash is collected.
• a method for demineralizing coal that expects to obtain high-purity pulverized coal on a non-oxidizing gas at a dust chamber outlet.
• any of carbon dioxide gas, nitrogen gas and inert gas, or any combination thereof can be used O
• the temperature and humidity of the non-oxidizing gas loaded with pulverized coal should not be preferably adjusted so as to increase the efficiency of separation of ash particles, for example, 10% and 100 ⁇ respectively. Adjust to 200 ° C.
• the drawing is a schematic configuration diagram showing a coal processing system for effectively implementing the present invention.
• (1) is a storage tank in which the coal to be treated is charged, and ( 2 ) is a storage tank (1).
• Dry electric dust collector installed downstream
• ( 3 ) is a carry-out passage from dry electricity (2)
• (4) is a blower interposed in the carry-out passage (3)
• (5) is a dry electric dust collector (2)
• (6) is a quantitative cut-out device arranged at the cut-out opening of the storage tank (1)
• ( 7) and (8) are the temperature control device and humidity control device installed in the carry-in passage (5), respectively.
• the loading passage (from one end of the storage tank (1) side of 5), carbon dioxide and nitrogen A medium from a non-oxidizing gas such as gas or inert gas is supplied.
• Arrow A in the figure indicates the flow of the medium, and pulverized coal that is continuously and quantitatively cut out from the storage tank (1) by the quantitative cutout device (6) is mixed with this medium.
• the pulverized coal is transported to the dust collecting chamber of the dry electric dust collector on the medium drawn by the blower ( 4 ), and the temperature controller (7) is located at a position before the dry electric dust collector (2).
• the temperature of the medium is adjusted to a predetermined temperature by a humidifier, and the humidity of the medium is increased by, for example, 10% or more by a humidity controller (8), and the medium is carried into the dust collection chamber.
• the specific resistance of carbon particles is generally / 0 (: ⁇ 10 4 [1'111], which is a low specific resistance, whereas the specific resistance Pa of ash particles is generally 10 4
• the specific resistance of the ash particles is minimum at about 50 to 60 ° C.) It increases with increasing temperature, reaches a maximum at about 100 to 200 ° C, and gradually decreases at higher temperatures. Temperature control
• the efficiency of collecting the ash particles in the dry dust (2) is improved by adjusting the temperature of the medium so that the ash particles are large (the specific resistance is reduced).
• the dry electric dust collector (2) can be operated by charging a high voltage, and the humidity of the medium is controlled by the humidity controller (8). Is adjusted and the dry electric precipitator (2) is charged with high voltage for operation. In other words, when the dry type ( 2 ) is operated by applying a high voltage, the electric field strength is higher, and thus the dust collection rate is improved and the ash separation efficiency is improved.
• mold powder coal as an object to be treated is transported in a stream of non-oxidizing gas, and the non-oxidizing gas loaded with pulverized coal during transport is transported.
• the temperature and humidity are adjusted and sent to the dry-type electrostatic precipitator.
• the ash particles are collected and separated in the dust-collecting chamber due to the difference in specific resistance between the carbon particles and the ash particles. Since high-purity pulverized coal with non-oxidizing gas is obtained at the outlet of the electrostatic precipitator, the workability of ash separation and removal is good and the separation accuracy can be easily adjusted.
• the dry electric dust collection chamber is filled with a non-oxidizing gas, ⁇ it is possible to explode even if a discharge phenomenon occurs regardless of whether dust coal enters the dust collection chamber. It can increase the purity of pulverized coal

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Electrostatic Separation (AREA)
• Solid Fuels And Fuel-Associated Substances (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

Family

ID=13762234

Family Applications (1)

Country Status (4)

Citations (3)

• 1982
  • 1982-04-14 WO PCT/JP1982/000120 patent/WO1983003619A1/ja active Application Filing
  • 1982-04-14 DE DE19823248881 patent/DE3248881T1/de not_active Ceased
  • 1982-04-14 GB GB08236845A patent/GB2127038B/en not_active Expired
  • 1982-04-14 BR BR8208076A patent/BR8208076A/pt unknown

Patent Citations (3)

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