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Clean coal gas production method

A production method and coal gas technology, applied in the field of coal gasification, can solve the problems of difficulty in ash removal, limitations of equipment and boiling conditions, and high amount of carryover, and achieve the effects of reducing the number of large equipment, facilitating factory production, and improving heat recovery

Active Publication Date: 2014-04-16
CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the early fluidized bed heat recovery process used a one-stage waste pot process, which had low thermal efficiency, and a large amount of waste heat (>200°C part) needed to be washed to cool down, equipment and boiling conditions were limited, the gasification intensity was low and the amount of solids carried out was large. Difficulty in ash removal
Regardless of the early or current fluidized bed gasification technology, there are low gasification efficiency, high amount of carryover, incomplete dust removal, and direct water cooling is required for dust removal and cooling. Water and gas are in direct contact for heat and mass transfer, reducing the gas to normal temperature
This method has simple process, better cooling effect, and general direct cooling dust removal effect (the dust content in the gas is still up to 100mg / m 3 ), and the dust in the gas is discharged into the cooling water, and another water treatment and sedimentation facility is required for treatment, but it cannot be completely removed, resulting in the circulation of black and ash water in the recycled use after cooling; directly resulting in large investment in fine dust removal and water treatment facilities, Low efficiency, difficult operation and management

Method used

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Effect test

Embodiment 1

[0033] Such as Figure 1-4 The method for producing clean gas by using the present invention as shown includes pneumatically transporting qualified pulverized coal to the coal scuttle 1, then to the coal storage tank 2, and sending it into the gasifier at 90° in three directions via the coal feeder 4 The three coal inlets 601-603 of 6 that are 90° to each other enter the gasifier 6. The gasification agent oxygen and steam are introduced into the mixer 3 through the outside, and are divided into two paths to enter the primary gasification zone and the secondary gasification zone (the other path with a higher pressure mixed gasification agent also enters the secondary gasification zone) for Complex reactions such as oxidation and reduction produce gas.

[0034]The direction and angle of primary gasification agent injection is an important factor to realize the vortex to hold up the pulverized coal, which is equivalent to the tornado effect; however, due to the single-point coal...

Embodiment 2

[0043] Such as Figure 1-3 The device for producing clean gas as shown includes a gasifier 6, the gasifier 6 is connected to a medium-pressure waste heat boiler 11 through a reflux cyclone 7 and a high-temperature cyclone 8 in sequence, and the medium-pressure waste heat boiler 11 is connected to a low-pressure waste heat boiler 20 through a metal membrane dust collector 17, and the low-pressure waste heat boiler 21 is connected to a cooler 22. The gasifier 6 is an inverted ladder structure, the lower end of which is a truncated cone structure, and the truncated cone structure is provided with three coal feeding ports 601-603 at 90° to each other, a dust return port 604, and three sets of coal hoppers. , the coal storage tank system can provide stable operation for the coal feeder; multi-point coal feeding provides convenience for the uniform distribution of solid materials, which can make the material layer thin and even, fully contact with the gasification agent, and achieve...

Embodiment 3

[0045] The concrete technical scheme of the present invention is described further below in conjunction with implementation example:

[0046] Raw gas generation part, the output is 50000Nm 3 In the ladder-type gasification furnace 6 of / h·unit, oxygen and steam are fed into the gasification furnace 6 evenly and in layers in the mixer 3, so that the solid material is fully boiled and the gasification reaction is carried out in time, and the reaction temperature reaches 950°C. In the secondary gasification zone, under the condition of uniform solid material, the pressure gasification agent has changed the defect that the original gasification agent cannot reach the center, making the gas-solid reaction more complete, and the reaction temperature can reach 1050°C. Part of the gas continues to react at the top of the furnace. The main components of the gas are: CO, 34%; H 2 , 40%; CO 2 , 23%; CH 4 , 2%, N 2 , 1% to achieve uniform and high-efficiency gasification of the whole ...

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Abstract

The invention discloses a clean coal gas production method. The clean coal gas production method is characterized in that the production method comprises the procedures of powdered coal gasification, dedusting in high-temperature segment and indirect cooling. The clean gas production method is composed of high-efficiency coal gas generation, heat recovery, high-temperature dedusting, and ash-free water cooling, therefore, the product gas can meet the requirement of the clean coal gas.

Description

technical field [0001] The invention relates to the field of coal gasification, in particular to a clean gas production method. Background technique [0002] With the promotion of modern coal mining technology, the output of pulverized coal and low-rank coal is increasing year by year. How to use advanced technology to utilize this kind of coal reasonably, efficiently and without pollution is a big topic worth studying. In addition to clean and complete combustion and oxidation conversion into secondary energy that has been industrialized, it is currently considered that a better way is to produce clean gas from coal gasification, which can then be used in industry and other industries. [0003] Fluidized bed technology has been used in my country for many years. It has low requirements for raw materials, simple raw material processing, particle size ≤ 10mm, moisture content ≤ 8%, can use low-quality coal (such as lignite, long-flame coal) as raw material, and the gas produc...

Claims

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Application Information

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IPC IPC(8): C10J3/48C10J3/86C10K1/02
Inventor 郭俊成
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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