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System for utilizing flue gas waste heat of coal-fired boiler

A flue gas waste heat, coal-fired boiler technology, applied in the direction of preheating, combustion methods, feed water heaters, etc., can solve the problems of high size requirements of low-temperature economizers, failure to meet cooling requirements, low cooling range, etc., to achieve improved Effective utilization, solving the shortage of installation space, and reducing the effect of flue gas temperature

Inactive Publication Date: 2019-08-23
山西中源科扬节能服务有限公司
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Problems solved by technology

[0004] The currently used low-temperature economizers are arranged between the air preheater and the ESP or after the induced draft fan. These two arrangements have high requirements on the size of the low-temperature economizer and have great limitations. For some boiler tail flue gas For those with higher temperature, due to the size limitation of the low-temperature economizer, it cannot meet the cooling requirements at all, and the cooling range is relatively low

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  • System for utilizing flue gas waste heat of coal-fired boiler

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Embodiment Construction

[0018] In order to understand the technical solution of the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings.

[0019] Such as figure 1 The coal-fired boiler flue gas waste heat utilization system shown includes boiler 1, air preheater 2, primary low-temperature economizer 4, electrostatic precipitator 5, induced draft fan 6, secondary low-temperature economizer 7, desulfurization tower 8 and Chimney 9; the flue gas outlet of the boiler 1 is connected with the flue gas inlet of the air preheater 2, and the flue gas outlet of the air preheater 2 is connected with the inlet flue of the first-stage low-temperature economizer 4, The outlet flue of the first-stage low-temperature economizer 4 communicates with the flue gas inlet of the electrostatic precipitator 5, and the flue gas outlet of the electrostatic precipitator 5 communicates with the flue gas inlet of the induced draft fan 6, and the indu...

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Abstract

The invention discloses a system for utilizing flue gas waste heat of a coal-fired boiler. The system comprises a boiler, an air preheater, a first-stage low-temperature economizer, an electric dust remover, an induced draft fan, a second-stage low-temperature economizer, a desulfurizing tower and a chimney, wherein the boiler, the air preheater, the first-stage low-temperature economizer, the electric dust remover, the induced draft fan, the second-stage low-temperature economizer, the desulfurizing tower and the chimney are sequentially connected; the two-stage low-temperature economizer andthe one-stage low-temperature economizer both communicate with a side water supply system; the side water supply system comprises a water supply port and a water outlet; a water inlet of the two-stage low-temperature economizer communicates with the water supply port of the side water supply system; a water outlet of the two-stage low-temperature economizer communicates with a water inlet of theone-stage low-temperature economizer through a pipeline; and a water outlet of the one-stage low-temperature economizer communicates with the water outlet of the side water supply system. By means ofthe system, space is saved, a large amount of fuel gas waste heat at the tail of the boiler is recovered, and the dust removal rate of the dust remover and the efficiency of the desulfurizing tower are improved.

Description

technical field [0001] The invention relates to the technical field of industrial flue gas purification and waste heat recovery, in particular to a coal-fired boiler flue gas waste heat utilization system. Background technique [0002] With the rapid growth of China's national economy, the requirements for waste heat recovery of flue gas at the tail of industrial boilers in various regions are also growing rapidly. At the same time, the waste heat recovery equipment of flue gas is also being further improved. The development of waste heat recovery plays a vital role. [0003] Under the current form of energy saving and emission reduction, the secondary reheating technology of coal-fired units and the near-zero emission standard of flue gas have emerged as the times require. The standard stipulates that the emission concentration of smoke and dust should be less than 5-10 mg / Nm3. In order to meet this standard, low-temperature Electrostatic precipitator technology, that is, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/36F23J15/02
CPCF22D1/36F23J15/02F23J2215/20
Inventor 张朝晖张海任海聪刘占江胡天亮
Owner 山西中源科扬节能服务有限公司
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