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Fixed bed-fluidized bed serially connected gasification method and apparatus

A technology of fixed bed gasifier and fluidized bed gasifier, which is applied in the manufacture of combustible gas, petroleum industry, joint combustion mitigation, etc. It can solve the problems affecting the continuous stability of biomass gasification production, affecting the use of gas, and carbon conversion Low efficiency and other problems, to achieve the effect of increasing calorific value and effective gas content, low cost, and increasing content

Active Publication Date: 2009-05-27
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional fluidized bed gasification method has a high carbon content in the ash, resulting in low carbon conversion
[0005] The existing fixed-bed gasifiers that use biomass or coal as raw materials generally have a high tar content in the product gas, which seriously affects the use of coal gas
In addition, due to the periodicity of biomass growth, it also brings periodicity in the supply of biomass raw materials, which affects the continuous stability of biomass gasification production

Method used

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  • Fixed bed-fluidized bed serially connected gasification method and apparatus
  • Fixed bed-fluidized bed serially connected gasification method and apparatus

Examples

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Embodiment 1

[0020] Such as figure 1 As shown, the present invention includes a fixed bed gasifier 1 , a fluidized bed gasifier 2 and a cyclone separator 3 .

[0021] The fixed-bed gasifier 1 in this embodiment is a gas upward gasifier. A fixed-bed material inlet 11 is arranged on the top of the fixed-bed gasifier 1. A fixed-bed gas outlet 12 is arranged on the upper part of the fixed-bed gasifier 1. A conventional rotary grate 13 is provided at the lower part of the bed gasifier 1 , and a fixed bed ash outlet 14 is provided at the bottom of the fixed bed gasifier 1 . A fixed bed gasification agent inlet 15 is arranged above the fixed bed ash outlet 14 and below the rotary grate 13, and the rotary grate 13 can evenly distribute the gasification agent.

[0022] The top of the fluidized bed gasifier 2 is provided with a manhole 21 for maintenance, the upper part of the fluidized bed gasifier 2 is provided with a fluidized bed gas outlet 22, and the lower part of the fluidized bed gasifier 2...

Embodiment 2

[0026] Such as figure 2 As shown, the fixed-bed gasifier 1 in this embodiment is a gas down-flow gasifier, and this embodiment is basically the same as Embodiment 1, the difference is that the fixed-bed gasification agent inlet 15' is set at the fixed-bed In the middle of the gasifier 1, instead of the lower part, the number of fixed bed gasification agent inlets 15' is 2 to 4; the fixed bed gas outlet 12' is set at the lower part of the fixed bed gasifier 1, located Above grate 13.

Embodiment 3

[0028] Such as figure 1 As shown, taking the device structure of Example 1 as an example, the fixed-bed fluidized-bed serial gasification method of the present invention is described, which includes the following steps:

[0029]1) The biomass gasification raw material with a particle size of 13-50 mm is fed downward into the fixed bed gasifier 1 in normal operation from the fixed bed material inlet 11 at the top of the fixed bed gasifier 1, and the superheated steam and air The mixed gas is sent upwards from the fixed bed gasification agent inlet 15 at the lower part of the fixed bed gasifier 1, and is evenly distributed into the fixed bed gasifier 1 through the rotary grate 13, so that the bulk gasification raw material and gasification agent are in a fixed state. The pyrolysis and gasification reaction is carried out by countercurrent contact in the bed gasifier 1 to produce tar-rich gas and ash. The ash is discharged from the fixed bed ash outlet 14, and the gas passes thro...

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Abstract

The invention relates to a method and a device for gasification, in particular to the method and the device for serial gasification of a fixed bed and a fluidized bed, wherein the method comprises the following steps: 1) feeding a gasification raw material with the particle size of between 13 and 50 millimeters and a gasification agent to a fixed bed gasifier to perform gasification reaction so as to generate coal gas and ash content, discharging the ash content from an ash discharging opening of the fixed bed, and introducing the coal gas to the lower part of a dense phase zone of a fluidized bed gasifier; 2) feeding a thin particle shapeed coal gasification raw material with the particle size of between 0.5 and 8 millimeters and the gasification agent into a fluidized bed gasifier to perform gasification reaction with the vertically raising coal gas so as to generate the coal and the ash content, discharging the ash content from the ash discharging opening of the fluidized bed, and introducing the coal gas into a cyclone separator; and 3) performing gas-solid separation on the coal gas in the cyclone separator, outputting the coal gas from a coal gas outlet of the cyclone separator, and sending back solid particles carried by the coal gas to the fluidized bed gasifier through a dipleg of the cyclone separator to perform the gasification reaction continuously. The method and the device have quite important significance on improving the economic benefit and reducing the sewage treatment cost for the medium and small-sized coal chemical enterprises in China.

Description

technical field [0001] The invention relates to a gasification method and device, in particular to a fixed-bed fluidized-bed serial gasification method and device. Background technique [0002] With the economic development, the demand for industrial gas and synthetic gas in my country is increasing day by day. Coal gasification technology is widely used in metallurgy, chemical industry, building materials, machinery and other industrial industries and civil gas. Coal gasification technology is mainly divided into fixed bed, fluidized bed and entrained bed gasification, atmospheric pressure coal gasification mainly adopts fixed bed and fluidized bed. [0003] Atmospheric fixed bed gasification technology is mainly based on mixed generator, UGI (UGI (atmospheric fixed bed coal gasification), water gas furnace, two-stage mixed generator, two-stage water gas furnace, etc., which have the advantages of simple operation, less investment Larger and lower equipment cost. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/00
CPCY02E20/18
Inventor 董卫果文芳徐春霞杨宗仁王鹏邓一英戢绪国张科达
Owner CCTEG CHINA COAL RES INST
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