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Systems and methods for power plant coupling to produce clean coal

A power plant, clean technology, applied in the direction of steam generation method using heat carrier, etc., to achieve the effect of reducing pollutant emissions, reducing investment, and stabilizing furnace temperature

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 achieve the combination of power plant power generation and clean coal production, and to balance the stable production of the two, and to provide a system and method for power plant coupled production of clean coal

Method used

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  • Systems and methods for power plant coupling to produce clean coal
  • Systems and methods for power plant coupling to produce clean coal
  • Systems and methods for power plant coupling to produce clean coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (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;

[0064] (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. ;

[0065] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0066] (4) The first and second pyrolysis gases are merged into return air (temperature 450°C), and returned to the burner of the power plant boiler through the induced draft device for power generation; the first and second flue gas are merged into return flue gas ( 800℃) into the power plant boiler for power generation; the total flow of return air and return flue gas is 12000Nm 3 / h;

[0067] The total flow rate of the first flue gas and the...

Embodiment 2

[0070] (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;

[0071] (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;

[0072] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0073] (4) The first and second pyrolysis gases are merged into return air (temperature 350°C), and returned to the burner of the power plant boiler through the induced draft device for power generation; the first and second flue gas are merged into return flue gas ( 900℃) into the power plant boiler for power generation; the total...

Embodiment 3

[0077] (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;

[0078] (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;

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

[0080] (4) The first and second pyrolysis gases are merged into return air (temperature 400°C), and returned to the burner of the power plant boiler through the induced draft device for power generation; the first and second flue gas are merged into return flue gas ( 750℃) into the power plant boiler fo...

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Abstract

The invention relates to the field of coupling power generation and coal-burning clean production in power plants, and discloses a system and method for coupling power plants to produce clean coal. The method comprises: (1) indirectly heating the raw coal with the first flue gas of 800-1200°C from the power plant boiler to carry out coal conversion, the final conversion temperature of the coal conversion is 500-640°C, and the conversion time is 10-60min , to obtain the first flue gas, the first pyrolysis gas and the converted coal; (2) use the second flue gas from the power plant boiler to indirectly heat the converted coal to remove impurities from the coal, and the final removal of impurities from the coal The impurity temperature is 650-750°C, and the impurity removal time is 10-60 minutes to obtain the second flue gas, the second pyrolysis gas and the de-impurity coal; (3) the first pyrolysis gas and the second pyrolysis gas are merged into a The wind returns to the boiler of the power plant; (4) dry-cooling the de-miscellaneous coal to obtain clean coal. Realize the normal power generation and production of power plants, and at the same time produce low-rank raw coal into clean coal.

Description

technical field [0001] The invention relates to the field of coupling power generation and coal-fired clean production in power plants, in particular to a system and method for coupling 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 of the top 10 m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B1/18
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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