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System for recycling afterheat and condensed water of desulfurized tail flue gas

A recovery system and flue gas waste heat technology, applied in the field of energy conservation and environmental protection, can solve problems such as low desulfurization efficiency

Inactive Publication Date: 2013-10-16
NORTH UNITED POWER CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cost of activated coke dry desulfurization for 2×600MW units is roughly 700-800 million, and the desulfurization efficiency is low

Method used

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  • System for recycling afterheat and condensed water of desulfurized tail flue gas

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Embodiment Construction

[0009] The technical idea of ​​the present invention is to install a waste heat and condensate recovery system in the outlet flue of the desulfurization tower to reduce the flue gas temperature and condense water vapor at the same time, and the water can be recovered through a special device.

[0010] see figure 1 , this embodiment presents a specific structure of a desulfurization tail flue gas waste heat and condensate recovery system, including a first condensing heat exchanger 1 and a second condensing heat exchanger 2 arranged on the outlet flue of the desulfurization tower, and the second condensing heat exchanger A high-efficiency demister 3 is arranged behind the heat exchanger 2, a cooling circulating water pump 4 is connected to the second condensing heat exchanger 2, and a cooling water outlet is connected to the first condensing heat exchanger 1; the first condensing heat exchanger 1 , The bottom of the second condensing heat exchanger 2 and the high-efficiency dem...

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Abstract

The invention discloses a system for recycling afterheat and condensed water of desulfurized tail flue gas. The system for recycling the afterheat and the condensed water of the desulfurized tail flue gas comprises a first condensing heat exchanger and a second condensing heat exchanger which are arranged on a desulphurizing tower outlet flue, wherein an efficient defogger is arranged behind the second condensing heat exchanger; a circulating cooling water pump is connected onto the second condensing heat exchanger; a cooling water outlet is connected onto the first condensing heat exchanger; condensed water recyclers are connected to the bottoms of the first condensing heat exchanger, the second condensing heat exchanger and the efficient defogger respectively; cooling water conveyed by the circulating cooling water pump enters the second condensing heat exchanger from the upper part, of the second condensing heat exchanger to be in a countercurrent contact with desulfurized flue gas for heat exchange, is drained from the cooling water outlet on the first condensing heat exchanger, and is finally drained through the efficient defogger. The system can be used for recycling the afterheat and the condensed water of the desulfurized tail flue gas in a power plant, so that the system has a great significance in water conservation and energy conservation of the power plant.

Description

technical field [0001] The invention belongs to the field of energy saving and environmental protection, and in particular relates to a recovery system for waste heat and condensed water of flue gas at the tail of desulfurization. Background technique [0002] Among the desulfurization methods of the power plant, the investment of the wet desulfurization system is low, and the cost of the limestone-gypsum wet desulfurization 2×600MW unit is about 160-180 million, and the desulfurization efficiency is very high. However, the cost of activated coke dry desulfurization for 2×600MW units is roughly 700-800 million, and the desulfurization efficiency is low. Due to the limitation of water index in the northern arid region, power plants may be forced to use only dry desulfurization. Therefore, if the water consumption of wet desulfurization can be greatly reduced or even zero water consumption can be achieved, wet desulfurization technology can also be used in water-scarce areas,...

Claims

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Application Information

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IPC IPC(8): F23J15/06
CPCY02E20/30
Inventor 王自宽梁志福谭厚章张方炜牛问哲李英伟边广平冯润富张利清刘羽平孙所清李佩陈海霞王廷王广戌熊英莹詹扬彭红文王德义
Owner NORTH UNITED POWER CO LTD
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