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Flexible transformation system for low-load operation of coal-fired power plant boiler

A coal-fired power station, low-load technology, applied in the direction of combustible gas purification/retrofit, steam boiler, fluidized bed boiler, etc., can solve the problems of high tar output, poor adaptability of boiler raw materials, complex process, etc., to reduce emissions, Facilitate large-scale application and promotion, and reduce costs

Active Publication Date: 2022-01-21
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rich variety of biomass and its different physical and chemical properties, the raw material adaptability of the boiler is poor.
In addition, the traditional mixed combustion method also has problems such as complex process flow and high tar output in large-scale industrial application

Method used

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  • Flexible transformation system for low-load operation of coal-fired power plant boiler
  • Flexible transformation system for low-load operation of coal-fired power plant boiler
  • Flexible transformation system for low-load operation of coal-fired power plant boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Referring to Fig. 1(a), when the system is running, firstly, the wood pellets with a particle size of not more than 10 mm will be transported from the feed port to the gasification reactor 3 through the crushing and drying process, wherein the gasification reactor 3 is the positive In the high-pressure operation state, the high-temperature air that has been preheated in two stages enters the gasification reaction furnace 3 through the primary air inlet 37 and the secondary air inlet 2 respectively, to provide the required energy and gasification agent for the gasification reaction process, and the high-temperature air The temperature is 650°C. The high-temperature air preheated in two stages is also passed into the fully premixed water-cooled burner 28 to provide air for the combustion of the combustible gas. In addition, the high-temperature air that has undergone two-stage preheating is also passed into the carbon ash separation device 32 to provide high-temperature a...

Embodiment 2

[0054] Referring to Fig. 1(b), the difference from Example 1 is that the gasification reactor in this example operates under normal pressure or negative pressure. Therefore, in order to introduce the high-temperature combustible gas generated in the gasification reactor into the In a coal power plant boiler, an air preheater 22 and an induced draft fan 41 need to be arranged in sequence after the gaseous product outlet 6. The air preheater 22 can reduce the temperature of the combustible gas to 420~450°C. The outlet of the air preheater 22 is connected with the air inlet of the carbon ash separation device 32 through a pipeline, so as to provide high-temperature air flow for the carbon ash separation process of the carbon ash separation device 32, and the high-temperature air through two-stage preheating does not need into the carbon ash separation device. Others are the same as in Example 1.

[0055] By pyrolyzing and gasifying various biomass raw materials, combustible gase...

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Abstract

The invention discloses a flexibility transformation system for low-load operation of a coal-fired power plant boiler. The flexibility transformation system comprises a biomass gasification device and the coal-fired power plant boiler, the coal-fired power plant boiler comprises a boiler and a full-premixing water-cooling combustor, and a gas outlet of the biomass gasification device is connected with a gas inlet of the full-premixing water-cooling combustor through a gas pipeline; the full-premixing water-cooling combustor is arranged on the boiler wall of the boiler; the biomass gasification device is used for obtaining a gasification product by taking biomass particles as raw materials; the coal-fired power plant boiler is used for co-combusting combustible gas and fire coal to generate heat for heating water and generating high-temperature steam; various biomass raw materials are pyrolyzed and gasified to obtain combustible gas and solid coke; biomasses with different physicochemical properties are converted into gasified products with relatively uniform properties, so that the problem of adaptability of boiler raw materials is effectively solved; and the full-premixing water-cooling combustor directly combusts combustible gas, so that the yield of tar and the emission amount of nitric oxide are reduced.

Description

technical field [0001] The invention belongs to the technical field of coal-fired power station boilers, and in particular relates to a flexible transformation system for low-load operation of coal-fired power station boilers. Background technique [0002] Many coal-fired power stations consume a large amount of coal every year and emit a large amount of carbon dioxide, sulfur dioxide, and nitrogen oxides. The emission of these polluting gases and the greenhouse effect and acid rain caused by them will cause serious economic losses and environmental damage. Therefore, it is urgent to speed up the adjustment of my country's energy structure, reduce the load of coal-fired power plant boilers, and seek cleaner energy and more efficient energy utilization technologies. [0003] my country produces a large amount of biomass waste every year, such as crop straw, urban wood waste, waste furniture, branch wood and tree roots, etc., with a total output of up to 10 billion tons per ye...

Claims

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Application Information

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IPC IPC(8): F22B31/00F22B31/04F22B31/08F23D14/02F23D14/62F23L15/04C10J3/60C10B53/00C10B57/00C10K1/02
CPCF22B31/0007F22B31/04F22B31/08F23D14/02F23D14/62F23L15/04C10J3/60C10B53/00C10B57/00C10B57/005C10K1/026Y02E20/18Y02E20/34
Inventor 赵钦新邹立杨文君王云刚梁志远邵怀爽
Owner XI AN JIAOTONG UNIV
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