Expansion type boiler waste heat recovery system

By adopting a multi-layer insulation structure and a composite desulfurizer design in the boiler waste heat recovery system, the problem of flue gas heat loss is solved, efficient waste heat recovery and desulfurization are achieved, equipment operating costs are reduced, and energy utilization is improved.

CN120819786APending Publication Date: 2025-10-21HANGZHOU HANGMIN XIAOCHENG THERMAL POWER CO LTD
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Patent Information

Application Number
CN202510960998.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-12
Publication Date
2025-10-21

AI Technical Summary

Technical Problem

Traditional boiler waste heat recovery systems suffer from significant flue gas heat loss during flue gas treatment, resulting in reduced waste heat recovery efficiency and increased equipment operating costs.

Method used

A multi-stage dust removal module, a flue gas desulfurization module and a heat exchanger module are used. A multi-layer insulation structure is formed through the aerogel layer between the inner and outer stainless steel tubes and the insulation layer of the fine filter box. Combined with the ceramic fiber layer in the Venturi pipe and the insulation cotton layer in the stainless steel casing, the heat loss of the flue gas is reduced. Composite desulfurizers and heat-conducting plates and fins are used for high-temperature desulfurization and waste heat recovery, and the circulation system of the oil storage tank circulation pump is combined for secondary heat utilization.

Benefits of technology

Effectively maintain flue gas temperature, improve waste heat recovery efficiency, reduce equipment operating costs, achieve coordinated optimization of desulfurization and waste heat recovery, and improve energy utilization.

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Abstract

The invention relates to an expansion type boiler waste heat recovery system, and relates to the technical field of boiler waste heat recovery, the expansion type boiler waste heat recovery system comprises a multi-stage dust removal module, a flue gas desulfurization module, a heat exchanger module and a waste heat recovery assembly, the multi-stage dust removal module comprises an inner stainless steel pipe, and one end of the inner stainless steel pipe is fixedly connected with a flue gas inlet pipe through a flange. By arranging the inner stainless steel pipe, the outer stainless steel pipe and the aerogel layer between the inner stainless steel pipe and the outer stainless steel pipe and cooperating with the heat preservation layer in the fine filtering box, a multi-layer heat preservation structure is formed, heat loss of flue gas in the dust removal process is effectively reduced, and the flue gas temperature is guaranteed; meanwhile, a ceramic fiber layer in the Venturi pipeline and a heat preservation cotton layer on the inner side of the stainless steel sleeve can further isolate heat, it is ensured that flue gas is kept at a high temperature in the dust removal, desulfurization and heat exchange processes, good conditions are created for follow-up waste heat recovery, the waste heat recovery efficiency is improved, and the situation that the follow-up technological process is affected due to the too low temperature is avoided; and the equipment operation cost and energy consumption are reduced.
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