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Brown coal pre-drying-air preheating-waste heat utilization composite coal-fired power generation system

A technology for preheating air and power generation systems, applied in the direction of preheating, combustion methods, steam applications, etc., can solve the problems of ineffective and full utilization of power generation resources, complicated power generation processes, energy waste, etc., and achieve energy density improvement and reduction Effects of smoke exhaust loss and equipment investment reduction

Inactive Publication Date: 2013-09-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, the separate setting of the lignite drying system and the power generation system leads to the complexity of the power generation process and the inconvenience of operation and management, and the power generation resources cannot be fully utilized effectively, resulting in energy waste

Method used

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  • Brown coal pre-drying-air preheating-waste heat utilization composite coal-fired power generation system

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Embodiment Construction

[0017] The present invention provides a lignite pre-drying-preheating air-waste heat utilization composite coal-fired power generation system, which will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0018] figure 1 Shown is a schematic diagram of the structure of the composite coal-fired power generation system. The system is mainly composed of lignite drying system 101 connected with steam turbine recuperation system and air preheating system 102, flue gas heating condensate system 103 connected with steam turbine recuperation system and air preheating system 102, steam turbine reheating system and steam turbine power generation device Connected structure, so that the dried lignite can be directly burned to generate electricity.

[0019] The lignite drying system 101 is composed of the dryer 2 connected to the separator 3 through the dry tail gas pipeline, the coal feeder 1 is fixed on the upper part of the d...

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Abstract

The invention discloses a brown coal pre-drying-air preheating-waste heat utilization composite coal-fired power generation system, and belongs to the power station energy-saving field. The system is mainly characterized in that a brown coal drying system is connected with a steam turbine regenerative system and an air preheating system, a smoke heat-setting water system is connected with the steam turbine regenerative system and the air preheating system, the steam turbine regenerative system is connected with a steam turbine generating device, the air preheating system is connected between the brown coal drying system and a boiler rear smoke channel, then whole-course heating of air is finished, and brown coal can be directly burned for power generation after being dried. Energy density of the brown coal is increased, boiler efficiency is improved, heat and moisture in dried tail gas are recycled, temperature of air in an inlet of an air pre-heater is increased, meanwhile, a smoke-water heat exchanger arranged in a hearth division smoke channel recycles smoke heat, coal consumption of a unit is expected to be greatly reduced, and therefore the efficient, energy-saving, water-saving and emission-reducing effects are achieved.

Description

technical field [0001] The invention belongs to the field of power station energy-saving equipment, and in particular relates to a composite coal-fired power generation system of lignite pre-drying-preheating air-waste heat utilization. Background technique [0002] my country's proven lignite resources amount to more than 130 billion tons, accounting for 13% of the country's coal reserves. Lignite is the youngest coal among raw coals. Its volatile content is generally 40% to 50%, the total moisture can reach 20% to 50%, the air-dried base moisture is 10% to 20%, and the low calorific value is generally only 7 to 15MJ. / kg. Because lignite has the characteristics of high volatile matter, high moisture, high ash content, low calorific value, low ash melting point, and easy spontaneous combustion, its mining and utilization are greatly restricted. Therefore, despite its low price, lignite is generally only used as a low-grade fuel. Combustion power generation near the place o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K17/06F23L15/00F22D1/00
CPCY02E20/34
Inventor 徐钢许诚杨勇平方亚雄杨志平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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