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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 direction of steam generation using heat carrier, energy input, 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 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 at the same time. It can not only make full use of the flue gas of the coal-fired power plant to process inferior coal to produce clean coal, but also use the waste gas produced by clean coal production to extract tar, and then burn the gas in the boiler Obtain heat and return it to the power plant for power generation, reducing the coal consumption of the power plant; it can also save the construction of heat sources and tail gas treatment devices for clean coal production, 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

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

[0075] (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;

[0076] (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;

[0077] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0078] (4) After the first and second raw coal gas are combined, 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 hot air obtained is passed into a waste heat boiler to generate ste...

Embodiment 2

[0082] (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;

[0083] (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;

[0084] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0085] (4) After the first and second raw coal gas are combined, 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 hot air obtained is passed into a waste heat boiler to generate steam and ...

Embodiment 3

[0089] (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;

[0090] (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;

[0091] (3) dry-cooling the de-miscellaneous coal to obtain clean coal;

[0092] (4) After the first and second raw coal gas are combined, 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 hot air obtained is passed into a waste heat boiler to generate steam...

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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) directly heating raw coal by using first flue channel gas with a temperature of 800-1200 DEG C from a power plant boiler, and carrying out coal conversion to obtain first raw gas and converted coal, wherein the final conversion temperature of the coal conversion is 500-640 DEG C, and the conversion time is 10-60 min; (2) directly heating the converted coal by using second flue channel gas with a temperature of 800-1200 DEG C from the power plant boiler, and carrying out coal impurity removing to obtain second raw gas and impurity removed coal, wherein the final impurity removing temperature of the coal impurity removing is 650-750 DEG C, and the impurity removing time is 10-60 h; (3) merging the first raw gas and the second raw gas, and carrying out tarremoving to obtain tar and coal gas; (4) combusting the coal gas, carrying out heat exchange, and returning the obtained steam and the tail gas to the power plant boiler so as to be used for power generation; and (5) 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 isachieved while the low-grade raw coal is produced into the 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
CPCY02P20/129
Inventor 高浩华苌亮次东辉杜万斗麻林李君张峰孙任晖陈薇
Owner CHNA ENERGY INVESTMENT CORP LTD
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