Thermal power plant boiler exhaust smoke waste heat recovery and cyclic utilization system

By using multi-stage heat exchange components and an automatic control system, the problems of waste heat recovery depth and corrosion risk, unreasonable energy utilization, and lack of coordinated water resource utilization in the waste heat recovery system of boiler flue gas in thermal power plants have been solved. This has enabled efficient and safe cascade utilization of waste heat and energy matching, achieving the goals of energy saving, water saving, and environmental protection.

CN121474577APending Publication Date: 2026-02-06北方联合电力有限责任公司包头第一热电厂
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Patent Information

Application Number
CN202511570424.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-30
Publication Date
2026-02-06

AI Technical Summary

Technical Problem

Existing waste heat recovery systems for boiler flue gas in thermal power plants suffer from problems such as a contradiction between the depth of waste heat recovery and the risk of corrosion, unreasonable utilization of energy grade, poor system flexibility, and lack of coordinated utilization of water resources, resulting in energy waste and environmental thermal pollution.

Method used

It adopts multi-stage heat exchange components and automatic control system, including high-temperature, medium-temperature and deep recovery heat exchangers, combined with flue gas flow balancing module and working fluid flow distribution module to realize cascade waste heat recovery and energy matching, and is integrated with power plant water resource management, equipped with status monitoring and linkage control platform.

Benefits of technology

Significantly improves waste heat recovery efficiency, realizes cascaded energy utilization, enhances boiler combustion efficiency and turbine work, reduces water consumption, ensures efficient and safe operation of the system under various working conditions, and achieves energy-saving, water-saving and environmental protection effects.

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Abstract

The embodiment of the invention provides a heat-engine plant boiler exhaust smoke waste heat recovery and cyclic utilization system. The system comprises a boiler, an air supply assembly, a heat exchange assembly and a chimney, wherein the air supply assembly and the heat exchange assembly are connected to an air inlet of the boiler and a smoke exhaust pipeline respectively. The air supply assembly comprises an air feeder used for receiving cold air, a cold air conveying pipeline, an air preheater and a hot air pipeline, wherein the cold air conveying pipeline, the air preheater and the hot air pipeline are sequentially connected with an outlet of the air feeder, and an outlet of the hot air pipeline is connected with an air inlet of the boiler. The heat exchange assembly comprises a dust remover, an induced draft fan, a high-temperature heat exchanger, a medium-temperature heat exchanger and a deep recovery heat exchanger which are sequentially connected with a smoke exhaust pipeline of the boiler, an outlet of the deep recovery heat exchanger is connected with an inlet of the chimney, and the chimney is used for exhausting smoke subjected to heat exchange into the atmosphere. Stepped recovery of boiler exhaust smoke waste heat is achieved through the heat exchange assembly, energy matching is carried out through the smoke temperature grade, the waste heat recovery efficiency is greatly improved, and meanwhile efficient cyclic utilization of energy is achieved.
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