System for achieving economizer hot water recycling by adopting start circulation pump and working method

A technology of application start-up and economizer, applied in the direction of promoting water circulation, etc., can solve the problems of expensive circulating pumps and pipelines, high medium pressure, etc., and achieve the effects of easy operation, significant economic benefits, and cost reduction

Pending Publication Date: 2019-04-30
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, the hot water circulation function of the economizer has been realized by adding a circulation pump and pipeline, such as the Chinese patent application number 200920046007.1, where the medium pressure is high, and the circulation pump and pipeline are expensive

Method used

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  • System for achieving economizer hot water recycling by adopting start circulation pump and working method

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0018] Example.

[0019] see figure 1 , the application of the starting circulation pump in this embodiment to realize the economizer hot water recirculation system includes the starting circulation pump 2, the economizer recirculation pipeline 6, the starting separator 8, the water storage tank 9, and the inlet pipe of the economizer road 10 and economizer 11; start separator 8 and water storage tank 9 are connected to the inlet of economizer 11 through economizer inlet pipeline 10, start circulation pump 2 is set on economizer inlet pipeline 10, and The inlet pipeline 10 of the economizer is installed with the inlet shut-off valve 1 of the startup circulation pump, the outlet shut-off valve 3 of the startup circu...

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Abstract

The invention relates to a system for achieving economizer hot water recycling by adopting a start circulation pump and a working method, and belongs to the field of coal-fired power station boilers.The system comprises the start circulation pump, an economizer recycling pipeline, a start separator, a water storage tank, an economizer inlet pipeline and an economizer. The function of economizer hot water recycling is achieved by the start circulation pump matched with the boiler. A circulation pump is not additionally required, and only a simple pipeline and a valve are needed. The system issimple in structure, is easy to improve, and is low in cost. Cost required for the circulation pump is greatly reduced, and the cost is saved.

Description

technical field [0001] The invention relates to a system and working method for realizing hot water recirculation of an economizer by using a starting circulation pump, and belongs to the field of coal-fired power plant boilers. Background technique [0002] At present, the environmental protection situation is severe, and most coal-fired power plants have achieved ultra-low emissions. With the rapid development of wind power and solar energy, the available hours of coal-fired units have been greatly reduced, and some coal-fired units are in a state of shutdown or low-load operation. The unit boiler will operate under a load of less than 50%. However, under this low-load operation mode, the flue gas temperature of the denitrification system cannot meet the input conditions for denitrification, resulting in the failure of normal operation of the denitrification facilities and affecting the emission of nitrogen oxides. By recirculating the hot water of the economizer, the tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B37/34
CPCF22B37/34
Inventor 李鹏辉罗昌福祁博武田平杨博闻叶智张少勇沈诚
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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