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Gasification method with gas waste heat utilization

A technology of coal gas and waste heat, applied in the field of gasification, can solve problems such as uneconomical, life-affecting, dusty, etc., to avoid safety hazards and increase calorific value

Active Publication Date: 2011-05-04
中科清能燃气技术(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is a scheme of using nitrogen as an intermediate heat carrier to absorb heat from high-temperature gas and then preheat the air, but the nitrogen system is expensive, and the nitrogen cycle requires power consumption, so it is very uneconomical
In the prior art, there is also the use of regenerators and reversing valves for air preheating, but because the high-temperature gas contains a lot of dust, it is prone to wear and other problems that affect life, which is not ideal.

Method used

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  • Gasification method with gas waste heat utilization
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  • Gasification method with gas waste heat utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 The shown two-stage furnace gasification system applying the gasification method with gas waste heat utilization of the present invention includes a two-stage furnace gasifier hearth 1 , a superheater 4 and an air-steam heat exchanger 7 . Lump coal is put into the gasifier hearth 1 from the top of the furnace, and air A is introduced, the high-temperature gas G produced by gasification flows through the heater 4 to release heat, and the external saturated steam SS is passed through the superheater 4 to absorb heat and raise the temperature to superheat Steam S, the superheated steam S is passed into the air-steam heat exchanger 7 to preheat the air A. The preheated air A and part of the superheated steam S drawn from the superheater 4 are passed into the gasifier furnace 1; the steam S drawn from the air-steam heat exchanger 7 is supplied externally.

Embodiment 2

[0039] Such as figure 2 The shown circulating fluidized bed twin-bed gasification system applying the gasification method with gas waste heat utilization of the present invention includes a circulating fluidized bed boiler 10, a circulating fluidized bed gasifier hearth 1, a cyclone separator 2, The circulation loop formed by the feeder 3 also includes a tail heating surface 9, a superheater 4, an air-steam heat exchanger 7, and auxiliary systems such as a gas purification device and a bottom slag cooling device (the auxiliary system is not shown in the figure).

[0040] The dried sludge C is added to the hearth 1 of the circulating fluidized bed gasifier, and air A is introduced from the bottom thereof, and the high-temperature circulating ash produced by the circulating fluidized bed boiler 10 is also sent into the hearth 1 of the circulating fluidized bed gasifier , to provide heat for the pyrolysis reaction and gasification reaction, the gas G produced is drawn from the t...

Embodiment 3

[0043] Such as image 3 The shown circulating fluidized bed single bed gasification system applying the gasification method with gas waste heat utilization of the present invention includes a circulating fluidized bed gasification furnace furnace 1, a cyclone separator 2, and a feeder 3. The circulation circuit also includes superheater 4, evaporation heating surface 5, steam drum 51, economizer 6, air-steam heat exchanger 7, and auxiliary systems such as gas purification device and bottom slag cooling device (the auxiliary system is not shown in the figure out).

[0044] The biomass fuel C is added to the hearth 1 of the circulating fluidized bed gasifier, and oxygen-enriched air A and steam S are introduced from the bottom thereof, and the biomass fuel C is partially burned in the lower part of the hearth 1 to provide heat, so that the biomass fuel C is Pyrolysis reaction and gasification reaction occur at high temperature, and the gas G produced is led out from the top of ...

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PUM

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Abstract

The invention discloses a gasification method with gas waste heat utilization, and relates to gasification technology. The method comprises the following steps of: adding a carbon-containing fuel into a hearth of a gasification furnace, introducing a gasification agent and performing pyrolysis and gasification reaction to produce gas, wherein the gasification agent is air, oxygen-rich air, pure oxygen, or a combination of one of the air, the oxygen-rich air and the pure oxygen, and steam; and heating feed water or external steam by using the sensible heat of the gas produced by the gasification furnace to produce superheated steam, and preheating the air, the oxygen-rich air or the pure oxygen introduced into the hearth of the gasification furnace by using the superheated steam. By fully utilizing the waste heat of the gas, the method is simple and safe and has small investment, and the heat value of the gas produced through single bed gasification is greatly improved.

Description

technical field [0001] The invention relates to the technical field of gasification, and relates to a gasification method with waste heat utilization of coal gas. Background technique [0002] The gasification of carbon-containing fuels is usually carried out at a high temperature above 800°C. When the gas is discharged from the gasifier, the temperature is also as high as above 800°C. If it is directly sent to the purification system, a large amount of sensible heat will be lost, so it is necessary to recover the gas waste heat. In the prior art, the gasifier is usually equipped with a waste heat boiler to absorb the sensible heat of the gas and generate saturated steam. Except for a small part of the steam that can be used as the gasification agent of the gasifier, the rest of the steam is supplied externally. Although this method recovers the waste heat of the gas, due to the limited operating conditions of the gasifier, it is impossible to pass all the steam into the ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/54
CPCY02P20/129
Inventor 吕清刚高鸣朱治平王东宇宋国良那永洁
Owner 中科清能燃气技术(北京)有限公司