Efficient flue gas waste heat recovery device

By adopting spiral guide plates and a transmission pipe structure with decreasing diameter in the flue gas waste heat recovery device, the contact time between flue gas and circulating water is prolonged. Combined with the drive motor and pump components, the problem of low heat recovery efficiency in the existing device is solved, and efficient preheating of low-temperature economizer condensate and effective utilization of waste heat are achieved.

CN120651024APending Publication Date: 2025-09-16HUANENG (DALIAN) THERMAL POWER CO LTD
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Patent Information

Application Number
CN202510831070.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-20
Publication Date
2025-09-16

AI Technical Summary

Technical Problem

The existing flue gas waste heat recovery device has low heat recovery efficiency and fails to effectively utilize the flue gas waste heat in the condensate treatment of the low-temperature economizer, resulting in difficulty in raising the water temperature, which in turn affects the normal operation of the low-temperature economizer.

Method used

A high-efficiency flue gas waste heat recovery device is designed. By setting a spiral guide plate and a transmission pipe structure with decreasing diameter on the outer wall of the transmission pipe, the contact time between the flue gas and the circulating water is prolonged, and a driving motor is used to drive the flue gas pipe to rotate, thereby enhancing the heat exchange efficiency. At the same time, a circulating return pipe and a pump assembly are set to realize the reuse of heat.

Benefits of technology

It improves the heat conduction efficiency between flue gas and circulating water, and can increase the condensate temperature at the inlet of low-temperature economizer from 50℃ to 100℃-120℃, solving the blockage problem of low-temperature economizer and realizing efficient utilization of waste heat.

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Abstract

An efficient flue gas waste heat recovery device comprises a waste heat recovery assembly assembled with a flue gas outlet of an evaporator. The circulating pipe assembly is arranged on one side of the waste heat recovery assembly, the waste heat recovery assembly converts flue gas waste heat in the waste heat recovery assembly into available energy according to the heat exchange principle, and the preheating process of circulating water in the circulating pipe assembly is achieved; the waste heat recovery assembly comprises two supports and a plurality of barrels assembled between the two supports, two spiral flow guide plates are symmetrically distributed on the outer wall of a single transmission pipe, when a flue gas pipeline rotates, the two spiral flow guide plates can generate hedging vortexes of local areas in the corresponding barrels, the flow speed of circulating water is slowed down, and the heat exchange efficiency of the flue gas pipeline is improved. The process is performed synchronously as follows: the structural characteristic that the diameters of the transmission pipes are gradually reduced from the middle to the two ends enables the flue gas injected into the transmission pipes to decelerate step by step when passing through the middle parts of the plurality of transmission pipes, so that the contact time of the flue gas and circulating water is prolonged, and the heat conduction efficiency of the flue gas and the circulating water is improved.
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