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A gasification method and system with fly ash regasification

A technology for regasification and gasification of coal gas, which is applied to the gasification of granular/powdered fuels, the manufacture of combustible gases, and the petroleum industry. It can solve problems such as difficult disposal, environmental pollution, and large production of gasification fly ash The effect of reducing equipment investment and enriching the pore structure

Active Publication Date: 2022-08-02
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gasification fly ash belongs to general solid waste, if not properly disposed of, it will cause environmental pollution
Therefore, fluidized bed coal gasification technology urgently needs to solve the bottleneck problem of large amount of gasification fly ash and difficult disposal.

Method used

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  • A gasification method and system with fly ash regasification
  • A gasification method and system with fly ash regasification
  • A gasification method and system with fly ash regasification

Examples

Experimental program
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Effect test

Embodiment 1

[0081] The invention provides a gasification method with fly ash regasification, figure 1 It is a system flow chart of a gasification method with fly ash regasification provided according to an embodiment of the present invention, such as figure 1 As shown, the method specifically includes:

[0082] (1) Passing the fuel and the main gasification agent into the circulating fluidized bed gasifier for gasification reaction to generate primary products; the reaction temperature of the circulating fluidized bed gasifier is between 850°C and 1200°C, specifically, During the operation of the gasifier, the maximum temperature at the bottom of the furnace is controlled to be 50-150°C lower than the softening temperature of the fuel ash in a weak reducing atmosphere to avoid over-temperature slagging at the bottom of the furnace. The fuel ash refers to the residue left after the fuel is completely burned and gasified.

[0083] The above-mentioned fuels are all solid fuels that can be ...

Embodiment 2

[0095] figure 2 It is a system flow chart of a gasification method with fly ash regasification provided according to another embodiment of the present invention, such as figure 2 As shown, this method is roughly the same as figure 1 The method shown is the same except that:

[0096] The first particle size fly ash with a temperature within the first temperature range, the auxiliary gasification agent, and the second particle size fly ash with a temperature within the second temperature range are passed into the fly ash gasifier to carry out gasification reaction. In the ash activator, the high temperature gas is introduced while the activation reaction is carried out, that is, the first particle size fly ash whose temperature is in the first temperature range, the second particle size fly ash whose temperature is in the second temperature range, and the high temperature gas are introduced into the ash activator. A fly ash activator, so that in the fly ash activator, a high...

Embodiment 3

[0101] The gasification method with fly ash regasification of the present invention specifically includes:

[0102] (1) pass fuel and main gasification agent into circulating fluidized bed gasifier to carry out gasification reaction to generate primary product;

[0103] (2) Passing the primary product into the first-stage gas-solid separation device to generate a mixture of coal gas and fly ash and carbon-containing particles with a temperature within the first temperature range, and returning the carbon-containing particles to the circulating fluidized bed through a return device gasifier;

[0104] (3) the mixture of coal gas and fly ash whose temperature is in the first temperature range is passed into the secondary gas-solid separation device for separation, and the first particle size fly ash whose temperature is in the first temperature range is obtained; also obtain the temperature in the second A mixture of coal gas and fly ash of a second particle size within a temper...

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Abstract

The present invention relates to the technical field of fuel gasification, in particular, to a gasification method and system with fly ash regasification. The gasification method with fly ash regasification includes: passing fuel and main gasification agent into a circulating fluidized bed gasifier for gasification reaction to generate a mixture of coal gas and fly ash whose temperature is within a first temperature range The mixture of coal gas and fly ash with temperature in the first temperature range is separated to obtain the first particle size fly ash with temperature in the first temperature range and the coal gas and the second particle size in the first temperature range The mixture of fly ash; the mixture of the coal gas with the temperature in the first temperature range and the fly ash of the second particle size is passed into the main cooling and dust removal system for cooling and separation, and the coal gas with the temperature in the second temperature range and the temperature in the second temperature range are obtained. Fly ash with the second particle size within the temperature range; pass the fly ash with the first particle size within the first temperature range and the fly ash with the second particle size within the second temperature range into the fly ash activator.

Description

technical field [0001] The present invention relates to the technical field of fuel gasification, in particular, to a gasification method and system with fly ash regasification. Background technique [0002] Fluidized bed gasification technology includes bubbling fluidized bed gasification technology and circulating fluidized bed gasification technology. The operating temperature of the fluidized bed gasification technology is moderate (for example, generally 850-1100° C.), and widely sieved pulverized coal is used as the raw material (for example, the particle size is generally 0-10 mm). Compared with entrained bed gasification technology, fluidized bed gasification technology has the advantages of low cost of coal preparation, wide adaptability of raw materials, less pollutant emission, less equipment investment, low operation and maintenance costs, and significant economic benefits. However, the gas generated by the fluidized bed gasifier will entrain a large number of f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/56C10J3/84
CPCC10J3/56C10J3/84
Inventor 张海霞吕清刚朱治平湛月平王小芳王东宇
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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