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Adjustable boiler air preheating system and method integrating heat regeneration and waste heat utilization

A technology of air preheating and air preheater, which is applied in the direction of preheating, combustion methods, steam application, etc., and can solve the problems of high cost, complexity, and large equipment investment in water production

Inactive Publication Date: 2015-11-25
郝江平
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Problems solved by technology

At present, due to the complexity of the indirect air-cooled peak cooling system, the investment in equipment is large, and the vacuum degree is generally only increased by about 2-5KPa, which is not economical.
Although the peak cooling method using spray water can greatly reduce equipment investment, the cost of desalinated water is too high and the economy is poor.

Method used

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  • Adjustable boiler air preheating system and method integrating heat regeneration and waste heat utilization

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Embodiment Construction

[0095] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0096] A new type of adjustable boiler air preheating system for comprehensive heat recovery and waste heat utilization proposed by the present invention, as attached figure 1 As shown, the main equipment of the system includes:

[0097] Air heater 2 before air preheating, flue gas cooler 7 after emptying, large condensate circulation branch pipe 9, condensate water circulation main pipe 12, condensate water main pipe 20, condensate small circulation branch pipe 24, low temperature stage low pressure heater 17 and high temperature stage Low pressure heater 15;

[0098] Both the air passage 25 and the flue gas passage 26 are connected to the air preheater 8; the flue gas in the flue gas passage 26 transfers part of the heat to the air in the air passage 25 through the air preheater 8;

[0099] The pre-empty air heater 2 is arranged o...

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Abstract

The invention belongs to the fields of thermal power generation and the like and particularly relates to an adjustable boiler air preheating system and method integrating heat regeneration and waste heat utilization. According to the adjustable boiler air preheating system and method, air preheating, waste heat utilization and regenerative heat cycling are made to be combined organically; heat-transmission cycling condensate water is divided into a large open cycle in which a bypass low-pressure heater extrudes a steam turbine to perform high-parameter steam extraction and a small closed cycle in which the low-pressure heater (or an added heat exchanger) is used for absorbing heat to increase low-parameter steam extraction; heat flow is divided according to the temperature level difference, heat source and cold source resources are dynamically and sufficiently used, optimal gradient utilization of heat energy in the power generation thermodynamic cycle is achieved, the energy use quality is improved, and energy losses are reduced. According to the adjustable boiler air preheating system and method, the operation mode of the system can be optimized and adjusted automatically according to the change of the operation condition so that gradient utilization of energy of different qualities can be achieved and energy losses can be reduced, and the thermodynamic cycle efficiency and the system economy are maximized.

Description

technical field [0001] The invention belongs to the field of thermal power generation, etc., and is particularly aimed at the technical fields of boiler air preheating, thermal system heat recovery cycle, boiler flue gas waste heat and steam turbine exhaust waste heat recovery and utilization, and specifically relates to a comprehensive heat recovery and waste heat utilization. Adjustment boiler air preheating system and method. Background technique [0002] The heat recovery cycle of thermal power generation can reduce the loss of cold source, reduce the average heat transfer temperature difference (reduce irreversibility and loss) to improve the efficiency of the thermodynamic cycle. Without affecting the boiler feed water temperature and the average heat transfer temperature difference between the extraction steam and the feed water, the greater the low parameter extraction steam, the greater the power generation and the smaller the cooling source loss. Usually limited...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L15/04F01K17/00F22D1/32F23J15/06
CPCY02E20/34
Inventor 郝江平魏绍清姜平
Owner 郝江平
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