Horizontal type circulating fluidized bed gasification method and device

A technology of circulating fluidized bed and gasification device, which is applied in the direction of gasification process, granular/powdered fuel gasification, and production of combustible gas. Problems such as high carbon content, to achieve effective utilization, improve carbon conversion rate and cold gas efficiency

Pending Publication Date: 2017-12-26
国科洁能(北京)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Aiming at the problems of high carbon content in solid slag, large amount of fly ash in gas, and high carbon content in fly ash in existing circulating fluidized bed gasifiers in the pri

Method used

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  • Horizontal type circulating fluidized bed gasification method and device

Examples

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Embodiment 1

[0049] Example 1, coal with ash melting point (ST) of 1100°C is used, the gasification temperature of the first gasification chamber is 900°C, the operating temperature of the second gasification chamber is 1000°C, the gasification agent is preheated air, the preheating The hot air temperature is 600°C. The carbon content of the slag discharged from the first gasification chamber is 5%, and the carbon content of the fly ash exiting the second cyclone separator is reduced to below 13%.

Embodiment 2

[0050] Example 2, using coal with an ash melting point (ST) of 1200°C, the gasification temperature of the first gasification chamber is 1100°C, the operating temperature of the second gasification chamber is 1150°C, and the gasification agent is preheated air and superheated air The steam mixture, the preheated air temperature is 850°C, the superheated steam pressure and temperature are 9.8MPa and 600°C respectively. The carbon content of the slag discharged from the first gasification chamber is 4%, and the carbon content of the fly ash is reduced to 8%.

Embodiment 3

[0051] Example 3, using coal with an ash melting point (ST) of 1250°C, the gasification temperature of the first gasification chamber is 1050°C, the operating temperature of the second gasification chamber is 1200°C, and the gasification agent is oxygen-enriched air and superheated For the mixture of steam, the temperature of oxygen-enriched air is 200°C, and the temperature of superheated steam is 0.6MPa and 200°C. The carbon content of the slag discharged from the first gasification chamber is 4.5%, and the carbon content of the fly ash is reduced to 9.7%.

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Abstract

The invention provides a horizontal type circulating fluidized bed gasification method and device and relates to the technical field of solid carbon-containing fuel gasification. The method comprises the following steps: by adopting gasification in partitions, carrying out gasification reaction on solid carbon-containing fuel added into a first gasification chamber and a first gasifying agent in the first gasification chamber to generate raw coal gas, conveying the raw coal gas into a second gasification chamber, and separating unreacted carbon-containing solid substances and coal gas by virtue of an inertia separator; enabling the carbon-containing solid substances to fall into the second gasification chamber to be further gasified with a second gasifying agent in the second gasification chamber at gasification temperature higher than that of the first gasification chamber, so as to generate coal gas, then carrying out cyclone separation, then forming purified coal gas, outputting the purified coal gas, and returning a separated solid material to the first gasification chamber by virtue of a material returning device; and carrying out solid-state deslagging at the bottom of the first gasification chamber. The device mainly comprises the first gasification chamber, the second gasification chamber, the inertia separator, the cyclone separator, a vertical tube and the material returning device. The method and device which are provided by the invention have the advantages that the problems that carbon content of solid slag of an existing circulating fluidized bed gasification furnace is relatively high, fly ash content of coal gas is high and fly ash carbon content is high can be solved, carbon conversion rate and coal gas cooling efficiency are improved, and the carbon-containing fuel is utilized more effectively.

Description

technical field [0001] The invention relates to the technical field of gasification of solid carbon-containing fuels; in particular, it relates to a horizontal circulating fluidized bed gasification method and device, and belongs to the technical field of gasification of solid carbon-containing fuels to produce gas or syngas under fluidization. Background technique [0002] Chinese invention patent 201410117504.1, application date 2014.3.26, publication date 2014.7.9, publication number CN103911179A, name: coal gasification method and device; The carbon content of the gas is relatively high, the amount of fly ash in the gas is large, and the carbon content is high. And Chinese invention patent application 201510641319.7, application date 2015.9.30, publication date 2017.4.5, publication number CN106554826A, name: coal gasification method and device of circulating fluidized bed with fine powder ash fusion; it discloses the existing circulating fluidized Due to the low gasifi...

Claims

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Application Information

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IPC IPC(8): C10J3/56C10J3/54C10J3/72C10J3/84
CPCC10J3/54C10J3/56C10J3/721C10J3/725C10J3/84C10J2300/1603C10J2300/0913C10J2300/0976C10J2300/0956C10J2300/0959
Inventor 阳绍军
Owner 国科洁能(北京)科技有限公司
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