Method and system for comprehensive utilization of tail heat of boiler

A boiler and heat technology, applied in the field of heat utilization method and utilization system of boiler tail, can solve the problems of high energy level heat waste, large temperature difference, etc., and achieve the effects of saving coal combustion, improving efficiency and reducing cold source loss

Inactive Publication Date: 2013-11-20
吕克庆
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature of the cold air at the inlet of the air preheater is about 20°C, and the temperature difference is very large, so there is a waste of high-energy heat

Method used

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  • Method and system for comprehensive utilization of tail heat of boiler

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Embodiment Construction

[0021] Attached below figure 1 The present invention will be further described.

[0022] The method for comprehensive utilization of heat at the tail of the boiler comprises the following steps:

[0023] (1) Use the final stage extraction steam of the steam turbine and / or the second final stage extraction steam to heat the cold air entering the boiler in the boiler air inlet duct 16 connected to the boiler after heat exchange by the heater 3, and heat the boiler cold air to 85~ 115°C; (2) The heated cold air in the heater 3 enters the air preheater 4 through the boiler air inlet duct 16; (3) The flue gas from the boiler economizer or denitration device passes through the outlet of the economizer / denitration device The flue 7 flows through the air preheater 4 and enters the flue 17 after the air preheater. This part of the flue gas exchanges heat with the cold air heated in the step (1) in the air preheater 4, and the other way flows through the feed water The economizer 6 en...

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Abstract

The invention relates to a method and system for comprehensive utilization of tail heat of a boiler. According to the method and system for comprehensive utilization of the tail heat of the boiler, low-level steam extraction is carried out by means of a turbine, in-boiler cold air in a boiler air inlet duct connected with the boiler is heated by extracted steam through a steam air heater, heated cold air in the steam air heater enters an air pre-heater through the boiler air inlet duct, heat exchange is carried out in the air pre-heater between part of smoke from a boiler economizer or a denitration device and the heated cold air, and the other part of smoke is used for heat exchange of part of supplied water through a water supply economizer. According to the method and system for comprehensive utilization of the tail heat of the boiler, the low-pressure steam is extracted to heat the cold air so that the heat of the steam is recovered to reduce cold source loss, part of the high-temperature smoke is saved at the same time, and the saved high-temperature smoke is used for heating part of the supplied water through an outlet flue of the economizer or an outlet flue the denitration device; high-level extraction steam of the turbine is saved due to the fact that the high-level smoke is used for heating part of the supplied water, the saved high-level extraction steam can continue to work in the turbine, and then the efficiency of the turbine is improved and fuel coal is saved.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a method and system for utilizing heat at the tail of a boiler. Background technique [0002] The biggest loss of thermal efficiency of steam turbines in thermal power plants is the loss of cold source of steam exhausted by steam turbines. For this reason, conventional steam turbines are designed with a heat recovery system, which recovers steam heat by heating condensate water and feed water through steam extraction of steam turbines, and reduces the loss of cold sources. Improve steam turbine thermal efficiency. However, the heat recovery system can only recover a small part of the steam, and most of the steam still needs to be condensed through the condenser, that is, the heat is lost through the heat exchange of the cooling tower or the air cooling tower. If the exhaust or extraction heat of the steam turbine can be recycled and the loss of the cold source c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/36F23L15/00F01K17/02F22D1/50
CPCY02E20/34
Inventor 吕克庆
Owner 吕克庆
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