Method and system for coupling power generation in power plants to produce clean coal

A power plant, clean technology, applied in the steam generation method using heat carrier, reducing greenhouse gases, climate sustainability, etc., to achieve the effect of reducing pollutant emissions, reducing coal consumption, and reducing investment

Active Publication Date: 2021-02-05
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 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 how to balance the production stability of the two, and provides a method and system for power plant power generation coupling to produce clean coal, which can realize the use of hot flue gas from the power plant. The production of clean coal does not affect the power generation production of the power plant at the same time, and coal tar can also be obtained

Method used

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  • Method and system for coupling power generation in power plants to produce clean coal
  • Method and system for coupling power generation in power plants to produce clean coal
  • Method and system for coupling power generation in power plants to produce clean coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] (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;

[0078] (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. ;

[0079] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0080](4) After the first and second pyrolysis gases are combined, the tar is removed to obtain a tar product; at the same time, the obtained coal gas is passed into a co-firing furnace for combustion, and the obtained hot air is passed into a waste heat boiler to exchange heat with boiler feed water to generate steam And tail gas, steam (temperature 800°C) is returned to the power plant boiler for power generation, and the tail gas is used as re...

Embodiment 2

[0084] (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;

[0085] (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;

[0086] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0087] (4) After the first and second pyrolysis gases are combined, the tar is removed to obtain a tar product; at the same time, the obtained coal gas is passed into a co-firing furnace for combustion, and the obtained hot air is passed into a waste heat boiler to exchange heat with boiler feed water to generate steam And tail gas...

Embodiment 3

[0091] (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;

[0092] (2) with 4000Nm 3 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;

[0093] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0094] (4) After the first and second pyrolysis gases are combined, the tar is removed to obtain a tar product; at the same time, the obtained coal gas is passed into a co-firing furnace for combustion, and the obtained hot air is passed into a waste heat boiler to exchange heat with boiler feed water ...

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Abstract

The invention relates to the field of power generation coupling of power plants and clean coal production, and discloses a method and system for power generation coupling production of clean coal in power plants. The method includes: (1) using the first flue gas from the power plant boiler to indirectly heat the raw coal for coal conversion, the final conversion temperature is 500-640°C, and the conversion time is 10-60 minutes to obtain the first flue gas, the first pyrolysis (2) Use the second flue gas from the power plant boiler to indirectly heat the dried coal to remove impurities from the coal. The final removal temperature is 650-750°C, and the removal time is 10-60 minutes to obtain the second flue gas , the second pyrolysis gas and the removal of miscellaneous coal; (3) remove the tar from the pyrolysis gas to obtain tar and coal gas; (4) burn the coal gas and exchange heat, and return the steam and tail gas obtained to the power plant boiler for power generation ; Combine the first flue gas and the second flue gas and return to the power plant boiler. While realizing the normal power generation and production of the power plant, low-rank raw coal is produced into clean coal.

Description

technical field [0001] The invention relates to the coupling field of power generation and clean coal production in power plants, in particular to a method and system for coupling power generation in power plants to produce clean coal. Background technique [0002] In China's energy consumption structure, coal consumption plays a major role. Among them, coal-fired power generation is the main form of coal consumption. However, due to coal-fired pollutant emissions and the impact of coal prices, coal-fired thermal power plants have experienced operating losses in power generation production 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 coal burning process is an important cause of smog. In recent years, the Beijing-Tianjin-Hebei region is the region with the most serious air pollution in my country, and 8 o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B1/18
CPCY02E20/30Y02P20/129
Inventor 杜万斗次东辉苌亮高浩华麻林李君张峰孙任晖陈薇
Owner CHNA ENERGY INVESTMENT CORP LTD
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