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A kind of autothermal pyrolysis method

A self-heating, pyrolysis technology, applied in special forms of dry distillation, direct heating dry distillation, gas dust removal, etc., can solve the problems of dangerous, high semi-coke temperature, spontaneous combustion in storage or transportation, etc., and achieve the effect of high-efficiency cascade utilization.

Active Publication Date: 2015-08-12
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The semi-coke produced by coal pyrolysis has a high temperature. If it cannot be cooled completely, it may spontaneously ignite during storage or transportation, causing danger.
At present, the cooling of semi-coke usually adopts the method of passing water or water vapor, such as a method for producing semi-coke, tar and gas from coal disclosed in Chinese patent application 201010587830.0, directly passing water or water vapor into semi-coke to make semi-coke The temperature of the coke out of the furnace is 100-180°C, but this method will produce waste water that is difficult to treat

Method used

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  • A kind of autothermal pyrolysis method
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  • A kind of autothermal pyrolysis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as figure 1 As shown, the fine coal A with a particle size ranging from 0 to 8mm is sent into the pyrolysis furnace 1 for pyrolysis, and the bottom of the pyrolysis furnace 1 is fed with air as a fluidizing gas. The fluidization velocity of the tower is 1.2-1.4m / s, and the ratio between the oxygen contained in the air and the coal is 0.05-0.15Nm 3 (oxygen) / kg (coal). The heat required for pyrolysis comes from the heat released from the combustion of part of the raw coal A; the reaction temperature in the pyrolysis furnace 1 is 700-750°C, and 60-75% of the volatiles in the coal are analyzed to produce gas C containing oil and gas and semi-coke D . Coal gas C entrains the fine powder of semi-coke D from the top of pyrolysis furnace 1 into the gas-solid separator 6, part of the separated semi-coke D returns to pyrolysis furnace 1, and the rest is discharged.

[0050] The high-temperature semi-coke D discharged from the bottom of the pyrolysis furnace 1 is sent into...

Embodiment 2

[0053] Such as figure 2 As shown, the fine coal A with a particle size ranging from 0 to 20 mm is sent into the pyrolysis furnace 1 for pyrolysis, and oxygen-enriched air and steam are fed into the bottom of the pyrolysis furnace 1 as fluidizing gas, and the fluidizing gas is heated The superficial fluidization velocity in the melting furnace 1 is 3.5-4.0m / s, and the ratio of the oxygen contained in the oxygen-enriched air to the coal is 0.2-0.35Nm 3 (oxygen) / kg (coal). The heat required for pyrolysis comes from the heat released from the combustion of part of the raw coal A; the reaction temperature in the pyrolysis furnace 1 is 1000-1050°C, and 80-95% of the volatiles in the coal are analyzed to produce gas C and semi-coke D. Coal gas C entrains the fine powder of semi-coke D from the top of pyrolysis furnace 1 into the gas-solid separator 6, part of the separated semi-coke D returns to pyrolysis furnace 1, and the rest is discharged. The separated coal gas C still entrai...

Embodiment 3

[0057] Such as image 3 As shown, the raw coal A of 0-15 mm is first sent into the drier 5 for drying. Then the dried fine coal B is sent into the pyrolysis furnace 1 for pyrolysis. The bottom of pyrolysis furnace 1 is fed with pure oxygen and steam as fluidization gas. The superficial fluidization velocity of fluidization gas in pyrolysis furnace 1 is 1.2-4.0m / s, and the ratio of oxygen to coal is 0.05-0.35Nm 3 (oxygen) / kg (coal). The heat required for pyrolysis comes from the heat released from the combustion of part of the coal; the reaction temperature in the pyrolysis furnace 1 is 700-1050°C, which can be realized by adjusting the amount of oxygen according to the requirements of the target product. Increasing the amount of oxygen can make the heat The temperature of the melting furnace 1 increases, and vice versa. 60-95% of the volatiles in the coal are analyzed to produce coal gas C and semi-coke D. Coal gas C entrains the fine powder of semi-coke D from the top of ...

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Abstract

The invention relates to a self-heating pyrolysis method. The self-heating pyrolysis method comprises the following steps of: feeding coal into a fluidized bed type pyrolysis furnace; introducing fluidifying gas at the bottom of the pyrolysis furnace, wherein the fluidifying gas contains oxygen, the oxygen content is sufficient for combustion of part of coal only, part of coal is combusted in the pyrolysis furnace and the oxygen is consumed while heat capable of heating the coal to a pyrolysis temperature is released, and the coal is pyrolyzed to produce semicoke and coal gas.

Description

technical field [0001] The invention relates to a coal conversion method, in particular to a coal pyrolysis and gasification method for preparing semi-coke and coal gas. Background technique [0002] my country's energy status is "more coal, less oil, and less gas". Direct combustion of coal to produce heat, electricity, and steam results in high energy consumption and serious environmental pollution. Transform coal into high-value gaseous, liquid and solid products through thermochemical conversion methods, and develop high-value coal cascade conversion and utilization processes that can produce gaseous fuels, solid semi-coke and other processed products, which will improve the utilization efficiency of coal resources, It is of great significance to reduce environmental pollution. [0003] At present, for the pyrolysis of coal, the main heat sources used are gas heat carrier, solid heat carrier or electric heating, so as to achieve the purpose of heating coal without intro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/04C10B49/10C10B57/10C10B57/02C10B39/02C10K1/02
CPCY02P20/129
Inventor 朱治平吕清刚那永洁高鸣孟广军王东宇刘秀如
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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