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A descending bed-fluidized bed series gasification method and device

A fluidized bed gasifier and fluidized bed technology, which is applied in the gasification process, granular/powder fuel gasification, and the manufacture of combustible gas, etc., can solve the problem of low processing efficiency, inability to form a stable bed, and low reaction temperature and other problems, to achieve the effect of complete decomposition

Active Publication Date: 2020-09-08
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many solid wastes are treated by using rotary kilns or mixing them with coal and sending them into fixed beds. The main problem of these two technologies is that the reaction temperature is too low. In addition to producing a large amount of difficult-to-treat tar, many solid wastes also contain chlorine. In rotary kilns It is easy to produce dioxin under the reaction conditions of fixed bed
Moreover, due to the poor thermal stability of solid waste itself, such as plastics and resins softened after being heated, a stable bed cannot be formed, so a large amount of coal must be mixed in the treatment process, and the treatment efficiency is very low

Method used

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  • A descending bed-fluidized bed series gasification method and device
  • A descending bed-fluidized bed series gasification method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A descending bed fluidized bed series gasification device ( figure 1 ), including a descending bed gasifier 1 and a fluidized bed gasifier 2. The inner diameter of the furnace chamber of the descending bed gasifier 1 gradually decreases from top to bottom, and the angle between the furnace wall and the central axis is 18°; the middle part of the furnace chamber of the descending bed gasifier is provided with a heat sink inclined downwards at 16° along the tangent line of the furnace wall. Unlock the raw material inlet 12 to increase the residence time of the material in the descending bed.

[0045] The top of the descending bed gasifier 1 is provided with a pulverized coal inlet 11, and the bottom is provided with a discharge outlet 13; the outside of the furnace chamber is provided with a water-cooled jacket 14, the lower part of the water-cooled jacket 14 is provided with a cooling water inlet 15, and the upper part is provided with a steam outlet 16.

[0046] The t...

Embodiment 2

[0050] A descending bed-fluidized bed series gasification device ( figure 2 ), differs from the device in Example 1 in that it also includes a cyclone separator 3, the inlet 31 of the cyclone separator 3 is connected with the synthesis gas outlet 21 of the fluidized bed gasifier 2, and the bottom of the cyclone separator 3 is connected with the flow The bottom of the fluidized bed gasifier 2 is connected; the top of the cyclone separator 3 is provided with a gas outlet 32, and the bottom of the cyclone separator 3 is connected to the bottom of the fluidized bed gasifier 2. The feed port 24 of the lower part.

Embodiment 3

[0052] A descending bed-fluidized bed series gasification method, adopting the device of embodiment 2, the steps are:

[0053] 1) Pulverized coal (particle size2 、CH 4 and water vapor) and ash; through energy calculation, ensure that the amount of pulverized coal can meet the subsequent pyrolysis reaction, adjust the amount of oxygen added, control the furnace temperature to be 50°C higher than the ash melting point of pulverized coal, and control the temperature of water vapor and oxygen at 5 ~10:1(kg / Nm 3 ) range.

[0054] 2) A mixture of low metamorphic coal and solid waste (mass ratio of low metamorphic coal to solid waste is 5:1, particle size 2 It is transported from the inlet 12 of the pyrolysis raw material in the middle of the furnace chamber, down 16° along the tangent line of the furnace wall, and enters the furnace chamber of the down-bed gasifier. CO 2 The mixed flow rate of coal with low degree of metamorphism and solid waste is 30-50m / s, CO 2 The carrier gas ...

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Abstract

The present invention relates to a kind of descending bed-fluidized bed serial gasification method and device, and its method is to spray coal powder from the top of descending bed, and O 2 Gasification reaction with water vapor, while providing heat for pyrolysis reaction; coal and / or solid waste with a particle size of less than 6mm are passed through the middle of the descending bed through CO 2 Carried along the tangential direction and inclined 5°~30°downwards, it is sent into the descending bed for pyrolysis, and the pyrolysis produces crude gas, tar and semi-coke; the pyrolysis products enter the fluidized bed and undergo gasification reaction with the gasification agent to form Syngas and ash. The device of the present invention has no special requirements on the thermal stability of raw materials. The method of the invention plays an important role in pyrolysis upgrading of coal with low degree of metamorphism and utilization of solid waste.

Description

technical field [0001] The invention belongs to the technical field of coal gasification and solid waste resource utilization, and relates to a descending bed-fluidized bed series gasification method and device. Background technique [0002] With the development of my country's coal chemical industry, more and more chemical companies use synthesis gas as raw material to synthesize various chemicals. Traditional coal gasification technologies are mainly divided into fixed bed, moving bed, fluidized bed and entrained bed gasification. With the consumption of high-quality coal resources in recent years, in order to meet the requirements of wider coal types and more efficient use of coal resources, it has begun to Explore the coupling or cascading process between different coal gasification technologies to achieve the purpose of reasonable recovery of heat and flexible adjustment of product components. The raw material reaction path in the traditional coal gasification process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/46C10J3/54C10J3/64C10J3/72C10J3/76C10J3/84
CPCC10J3/466C10J3/54C10J3/64C10J3/721C10J3/76C10J3/84C10J2300/0916C10J2300/093C10J2300/0946C10J2300/0959C10J2300/0976
Inventor 胡耀峰郝成浩王阳张宏科
Owner WANHUA CHEM GRP CO LTD