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Method for recycling flue gas waste heat of thermal power plant boiler

A boiler flue gas and waste heat recovery technology, which is applied in combustion methods, preheating, lighting and heating equipment, etc., can solve the problems of low quality of flue gas waste heat and the influence of boiler efficiency, achieve good economic and social benefits, improve The effect of recycling efficiency and reducing energy consumption in power generation

Inactive Publication Date: 2012-05-16
上海成信设施科技有限公司 +1
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  • Abstract
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Problems solved by technology

In this method, the temperatures at both ends of the heat exchanger 81 are generally 115°C and 90°C respectively, and the temperature difference is 25°C. Similarly, the quality of the waste heat of the flue gas is not high, and the heat exchanger 81 can only be used for heating and desulfurization after the temperature is low. The flue gas does not affect the improvement of boiler efficiency

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  • Method for recycling flue gas waste heat of thermal power plant boiler
  • Method for recycling flue gas waste heat of thermal power plant boiler
  • Method for recycling flue gas waste heat of thermal power plant boiler

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Embodiment Construction

[0024] Such as image 3 As shown, in the method for recovery and utilization of waste heat from boiler flue gas in a thermal power plant, the fan 11 and the air preheater 12 are connected in series to the cold air channel of the boiler 10, the air preheater 12, the dust collector 13, the induced draft fan 14, the booster The flue of the fan 15 and the desulfurization tower 16 is connected in series to the exhaust flue of the boiler 10 and the chimney 17. The boiler 10 provides the steam of the steam turbine 20, and the condensed water of the steam turbine 20 returns to the boiler 10 through the heat recovery system 22. The heat recovery system 22 includes condensate boiler 23, a plurality of low-pressure condensed water heaters 25 and high-pressure condensed water heaters 24 connected in series. In this method, the first heat exchanger 5 is connected in parallel on the air preheater 12 of the exhaust flue of the boiler 10, and the first heat exchanger 5 is connected in parallel...

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Abstract

The invention discloses a method for recycling flue gas waste heat of a thermal power plant boiler. A first heat exchanger is connected in parallel to an air pre-heater of a boiler exit flue, the heat exchange medium input / output end of the first heat exchanger is connected with a high-pressure condensed water heater through a flow control valve, and the high-pressure condensed water is heated, so that steam extraction of high-quality steam of a steam turbine is reduced. By the method, the recycling efficiency of the exhaust waste heat of the boiler is effectively improved, the work efficiency of the boiler and the steam turbine is improved, the energy consumption of power generation is reduced, and good economic benefits and social benefits are obtained.

Description

technical field [0001] The invention relates to a method for recovering and utilizing waste heat of boiler flue gas in a thermal power plant. Background technique [0002] The air preheater of a thermal power plant is a heat exchanger. The high-temperature flue gas discharged from the boiler economizer exchanges heat with the cold air before entering the boiler, but the air flow rate is smaller than the flue gas flow rate. The air side of the air preheater The heat exchange with the flue gas side is asymmetrical, and the high-grade flue gas waste heat is not fully and effectively utilized, but is discharged from the chimney; under the background of vigorously advocating energy saving and emission reduction, how to reduce the smoke emission of coal-fired boilers such as thermal power plants? It is of great significance to save energy and protect the environment by reducing heat energy loss. [0003] The exhaust smoke loss in the operation of the thermal power plant boiler is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D11/06F23L15/00F23J15/08
CPCY02E20/34
Inventor 袁一军王金旺
Owner 上海成信设施科技有限公司
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