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System and method for treating pulverized coal and calcium-based raw material

A pulverized coal, calcium-based technology, used in catalytic treatment of combustible gas, mechanical treatment of coal loaded into the furnace, calcium carbide, etc. The effect of high hydrogen content

Inactive Publication Date: 2017-05-10
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of hydrogen is expensive, so finding alternative atmospheres for hydrogen has become the focus of many researchers

Method used

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  • System and method for treating pulverized coal and calcium-based raw material
  • System and method for treating pulverized coal and calcium-based raw material

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Experimental program
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Effect test

preparation example Construction

[0044] The preparation method of the mixed coal powder and calcium-based raw material ball is as follows: firstly, the medium and low-rank coal and the calcium-based raw material are crushed and screened, and the middle and low-rank coal is crushed to <1 mm; the calcium-based raw material is crushed to <3 mm; then Mix coal powder, calcium-based raw material and binder, and press to form; the amount of binder added is 1.0wt%-10.0wt% of the mixed material; the mass ratio of calcium-based raw material to coal powder is 0.8-1.2:1 ;

[0045] The second step: raw gas purification: the raw gas produced by pyrolysis enters the gas purification unit, and is filtered through a solid bed and tar catalytic cracking to obtain clean gas; the tar catalytic cracking catalyst bed is CaO; the temperature of tar catalytic cracking is 700 -900°C;

[0046] The third step: coal hydrogenation gasification: the clean coal gas sent by the purification unit is used as the hydrogen source, and the hydr...

Embodiment 1

[0056] Using the system of the present invention, first crush and sieve the middle and low rank coal and limestone, crush the middle and low rank coal to <1mm; crush the limestone to <2mm; then mix the coal powder, limestone and binder, and press into shape , to obtain a mixed ball of coal powder and limestone; wherein, the amount of binder added is 1.0wt% of the mixed material, and the mass ratio of limestone to coal powder is 0.8:1.

[0057] Then the pulverized coal and limestone mixed balls are sent to the pyrolysis unit of the preheating furnace by a belt conveyor. The mixed pellets are pyrolyzed at 900°C for 20 minutes in the preheating furnace to obtain raw coal gas and high-temperature solid pellets; the raw coal gas is directly transported to the purification reactor at high temperature, and the temperature in the reactor is kept at 750°C. The raw coal gas first passes through the gas Distributor to ensure that the gas is evenly distributed in the reactor, and then thr...

Embodiment 2

[0059] This embodiment is the same as the system used in the above-mentioned embodiment 1, but the process conditions are different, as described below. Crushing and screening the middle and low rank coal and quicklime, crushing the middle and low rank coal to <1mm; crushing carbide slag to <3mm; then mixing coal powder, quicklime and binder, and pressing to form coal powder and quicklime Mixed ball; wherein, the amount of binder added is 10.0wt% of the mixed material, and the mass ratio of quicklime to coal powder is 1.2:1.

[0060] Then the pulverized coal and quicklime mixed balls are sent to the pyrolysis unit of the preheating furnace by a belt conveyor. The mixed pellets are pyrolyzed at 800°C for 15 minutes in the preheating furnace to obtain raw coal gas and high-temperature solid pellets; the raw coal gas is directly transported to the purification reactor at high temperature, and the temperature in the reactor is kept at 850°C. The raw coal gas first passes through t...

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Abstract

The invention relates to a system and a method for treating pulverized coal and a calcium-based raw material. The system comprises a pyrolysis unit, a gas purification unit, a hydrogasification unit and a calcium carbide smelting unit, wherein the pyrolysis unit comprises a pulverized coal and calcium-based raw material mixed pellet inlet, a raw coke oven gas outlet and a pyrolysis solid pellet outlet; the gas purification unit comprises a raw coke oven gas inlet and a purified coke oven gas outlet; the raw coke oven gas inlet is connected with the raw coke oven gas outlet; the hydrogasification unit comprises a pulverized coal spray nozzle, a purified coke oven gas spray nozzle, a coke residue outlet and an oil gas outlet; the purified coke oven gas spray nozzle is connected with the purified coke oven gas outlet; the calcium carbide smelting unit comprises a high-temperature solid pellet inlet, a calcium carbide furnace gas outlet and a calcium carbide outlet; the high-temperature solid pellet inlet is connected with the pyrolysis solid pellet outlet. According to the system and the method disclosed by the invention, by using the advantage of high quality and high hydrogen content of pyrolysis gas obtained by copyrolysis of coal and quick lime in a preheating furnace, the pyrolysis gas can be used as a hydrogen source of coal hydrogasification when calcium carbide is produced, so that the cost of the hydrogen source is reduced, and the thermal efficiency of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a system and method for processing coal powder and calcium-based raw materials. Background technique [0002] Coal hydrogasification refers to the process of reacting raw coal powder and hydrogen-containing reaction gas under high temperature and high pressure conditions (800°C-1000°C, 3MPa-8MPa) to generate methane-rich gas and light oil. Compared with traditional coal gasification, coal hydrogenation gasification has the characteristics of simple process, high thermal efficiency and low pollution, so it has been widely concerned and applied. However, hydrogen is expensive, so finding alternative atmospheres for hydrogen has become the focus of many researchers. [0003] According to prior art reports, powdery medium-low rank coal and powdery quicklime are mixed and pressed into balls, and then pyrolyzed in a preheating furnace to obtain high-temperature a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B53/00C10B43/00C10B37/00C10B57/18C10K1/02C10K3/02C10G1/00C10B27/00C01B32/942
CPCC10B27/00C10B37/00C10B43/00C10B53/00C10B53/04C10B57/18C10G1/002C10K1/02C10K3/023
Inventor 刘维娜丁力郭启海赵小楠吴道洪
Owner SHENWU ENVIRONMENTAL TECH CO LTD
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