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Method and system for producing clean coal by coupling power generation in a power plant

A power plant, clean technology, applied in the steam generation method using heat carrier, lighting and heating equipment, fuel, etc., to achieve the effect of reducing investment, reducing coal consumption, and reducing pollutant emissions

Active Publication Date: 2021-02-26
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of how to realize the combination of power plant power generation and clean coal production, and to balance the stable production of the two, and to provide a method and system for power plant power generation coupled production of clean coal

Method used

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  • Method and system for producing clean coal by coupling power generation in a power plant
  • Method and system for producing clean coal by coupling power generation in a power plant
  • Method and system for producing clean coal by coupling power generation in a power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) put 5000Nm 3 / h of the first flue gas (900°C) indirectly heats 4,500kg of raw coal (lignite, with a particle size of 20mm) in the rotary kiln for 45 minutes of coal conversion, and the final conversion temperature is 600°C to obtain the first flue gas, the first pyrolysis gas and converted coal;

[0067] (2) put 5000Nm 3 / h of the second flue gas (900°C) indirectly heats the converted coal in the rotary kiln to remove impurities for 35 minutes. ;

[0068] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0069] (4) Combine the first and second pyrolysis gases and pass them into the co-firing furnace for combustion. The hot air obtained is passed into the waste heat boiler and boiler feed water for heat exchange to generate steam and tail gas, and the steam (temperature 800°C) is returned to the power plant boiler Used for power generation, the tail gas is used as return air (temperature 450°C) and returned to the boiler of the power plant through...

Embodiment 2

[0073] (1) Use 6500Nm 3 / h of the first flue gas (1000°C) indirectly heats 4000kg of raw coal (non-caking coal, particle size: 30mm) in the tower moving bed to carry out coal conversion for 30min, and the final conversion temperature is 500°C to obtain the first flue gas, first pyrolysis gas and converted coal;

[0074] (2) Use 3500Nm 3 / h of the second flue gas (1000°C) indirectly heats the converted coal in the rotary kiln to remove impurities for 30 minutes, and the final removal temperature is 700°C to obtain the second flue gas, the second pyrolysis gas and the coal;

[0075] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0076] (4) Combine the first and second pyrolysis gases and pass them into the co-firing furnace for combustion. The hot air obtained is passed into the waste heat boiler and boiler feed water for heat exchange to generate steam and tail gas, and the steam (temperature 900°C) is returned to the power plant boiler Used for power gen...

Embodiment 3

[0080] (1) Use 6000Nm 3 / h of the first flue gas (950°C) indirectly heats 5000kg of raw coal (long-flame coal, particle size: 3mm) in the tower-type moving bed, and carries out coal conversion for 40min, and the final conversion temperature is 550°C, and the first flue gas, first pyrolysis gas and converted coal;

[0081] (2) with 4000Nm3 The first flue gas (950°C) in the rotary kiln indirectly heats the converted coal in the rotary kiln for 30 minutes of coal removal, and the final removal temperature is 650°C to obtain the second flue gas, the second pyrolysis gas and the removal of impurities coal;

[0082] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0083] (4) Combine the first and second pyrolysis gases and pass them into the co-firing furnace for combustion. The hot air obtained is passed into the waste heat boiler and boiler feed water for heat exchange to generate steam and tail gas, and the steam (temperature 750°C) is returned to the power pla...

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Abstract

The invention relates to the field of coupling of power plant power generation and clean coal production, and discloses a method and a system for coupling power plant power generation and clean coal production. The method comprises: (1) indirectly heating raw coal by using first flue channel gas from a power plant boiler, and carrying out coal conversion to obtain first flue gas, first pyrolysis gas and converted coal, wherein the final conversion temperature is 500-640 DEG C, and the conversion time is 10-60 min; (2) indirectly heating the converted coal by using second flue channel gas fromthe power plant boiler, and carrying out coal impurity removing to obtain second flue gas, second pyrolysis gas and impurity removed coal, wherein the final impurity removing temperature is 650-750 DEG C, and the impurity removing time is 10-60 min; (3) merging the first flue gas and the second flue gas into return flue gas, feeding into the power plant boiler so as to be used for power generation, merging the first pyrolysis gas and the second pyrolysis gas, and sequentially carrying out combustion and heat exchange; and (4) carrying out dry cooling on the impurity removed coal to obtain clean coal. With the method and the system of the present invention, the normal power generation of the power plant is achieved while the low-grade raw coal is produced into the clean coal.

Description

technical field [0001] The invention relates to the field of coupling power generation of power plants and clean coal-fired production, in particular to a method and system for coupling power generation of power plants to produce clean coal. Background technique [0002] In China's energy consumption structure, coal consumption plays a major role. The power generation production of coal-fired thermal power plants has experienced operating losses in recent years, and the overall load rate of coal-fired power plants is low, which restricts the sustainable development of the power generation industry. [0003] In addition, the flue gas emission produced by the civil scattered coal combustion process is an important cause of smog. In order to deal with the increasingly severe air pollution problem, the state has successively issued policy documents and carried out actions to control the atmospheric environment. Compared with coal-fired power plants, about 300 million tons of c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B1/18F23J15/02C10B53/00C10B49/02C10B57/00C10L5/00
Inventor 杜万斗高浩华次东辉苌亮麻林李君张峰孙任晖陈薇
Owner CHNA ENERGY INVESTMENT CORP LTD
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