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

A power plant, clean technology, applied in solid fuel, petroleum industry, fuel and other directions, can solve the problem of reducing the cleaning project of civil bulk coal, achieve the effect of stabilizing furnace temperature, simplifying production process and reducing investment

Active Publication Date: 2021-04-30
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 stable production of the two. It provides a method and system for power plant power generation coupled production of 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. It can not only use the flue gas of the coal-fired power plant to process low-quality coal to produce clean coal, but also use the waste gas produced by clean coal production to extract tar, and then return the gas to the power plant for power generation. Reduce the coal consumption of the power plant; it can also save the heat source of clean coal production and the construction of the purification treatment device for the generated gas, simplify the process, reduce the construction investment of civil loose coal cleaning projects, and give full play to the synergistic benefits of power plants and clean coal production; can get coal tar

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) put 5000Nm 3 / h of the first flue gas (900°C) and 4500kg of raw coal (lignite, particle size 20mm) are directly contacted in a countercurrent manner in the rotary kiln, and the coal conversion is carried out for 45min, and the final conversion temperature is 600°C, and the first raw coal is obtained. gas and converted coal;

[0070] (2) put 5000Nm 3 The second flue gas (900°C) per hour is in direct contact with the converted coal in a countercurrent manner in the rotary kiln, and the coal is decontaminated for 35 minutes. The final decontamination temperature is 650°C to obtain the second raw coal gas and decontaminated coal;

[0071] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0072] (4) Carry out tar removal by condensation after the first and second raw gas are combined to obtain tar products; the gas obtained at the same time is used as return air (12000Nm 3 / h, temperature 450°C) is returned to the burner of the power plant boiler throu...

Embodiment 2

[0076] (1) Will 6500Nm 3 / h of the first flue gas (1000°C) and 4000kg of raw coal (non-caking coal, particle size of 1mm) are directly contacted in a fluidized bed in a countercurrent manner, and the coal conversion is carried out for 30 minutes, and the final conversion temperature is 500°C. The first raw gas and converted coal;

[0077] (2) 3500Nm 3 The second flue gas (1000°C) per hour is in direct contact with the converted coal in a countercurrent manner in the rotary kiln, and the coal is decontaminated for 30 minutes, and the final decontamination temperature is 700°C to obtain the second raw gas and decontaminated coal;

[0078] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0079] (4) After the first and second raw gas are combined, the tar is removed by condensation to obtain a tar product; the gas obtained at the same time is used as return air (11000Nm 3 / h, temperature 350°C) is returned to the burner of the power plant boiler through the induc...

Embodiment 3

[0083] (1) Will 6000Nm 3 / h of the first flue gas (950°C) and 5000kg of raw coal (long-flame coal, particle size 3mm) are directly contacted in a countercurrent manner in the moving bed, and the coal conversion is carried out for 40 minutes, and the final conversion temperature is 550°C, and the first - raw gas and converted coal;

[0084] (2) 4000Nm 3 The second flue gas (950°C) per hour is in direct contact with the converted coal in a countercurrent manner in the rotary kiln, and the coal is decontaminated for 30 minutes, and the final decontamination temperature is 650°C to obtain the second raw coal gas and decontaminated coal;

[0085] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0086] (4) After the first and second raw gas are combined, the tar is removed by condensation to obtain a tar product; the gas obtained at the same time is used as return air (10500Nm 3 / h, temperature 400°C) is returned to the burner of the power plant boiler through th...

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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 comprises: (1) directly heating the raw coal with the first flue gas from the power plant boiler at 800-1200°C to carry out coal conversion, the final conversion temperature of the coal conversion is 500-640°C, and the conversion time is 10-60 minutes, Obtain the first raw coal gas and converted coal; (2) directly heat the converted coal with the second flue gas of 800-1200° C. from the power plant boiler to remove impurities from the coal, and the final removal temperature of the coal to remove impurities is 650~750°C, the impurity removal time is 10~60min, and the second raw coal gas and the impurity-removed coal are obtained; (3) tar is removed after the first raw coal gas and the second raw coal gas are merged to obtain tar and coal gas; The gas is returned to the burner of the power plant boiler in the form of return air for power generation; (4) dry-cooling the de-miscellaneous coal to obtain clean coal. It realizes the normal power generation production of the power plant and at the same time produces low-rank raw coal 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): C10L5/02C10L9/08
Inventor 次东辉麻林苌亮杜万斗高浩华李君张峰孙任晖陈薇
Owner CHNA ENERGY INVESTMENT CORP LTD
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