Flue gas-condensed water waste heat recycling system and method for deep peak regulation coal-fired power generating unit

By adopting a collaborative system of flue gas-condensate heat exchanger and absorption heat pump in coal-fired generator sets, combined with the cascade utilization of heat storage components, the problem of low waste heat recovery efficiency during low load operation in traditional systems is solved, efficient waste heat recovery and energy storage conversion is achieved, and peak shaving capacity and energy utilization efficiency of power plants are improved.

CN120140736APending Publication Date: 2025-06-13XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202510447844.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-10
Publication Date
2025-06-13

AI Technical Summary

Technical Problem

When the deep peak-shaving and low load operation of coal-fired generator sets, the traditional waste heat recovery system is low in efficiency, the latent heat of flue gas is difficult to utilize, and the low-temperature waste heat of condensate is difficult to efficiently recover and utilize.

Method used

The flue gas-condensate heat exchanger is used to coordinate with the absorption heat pump, and the waste heat of the flue gas is transferred to the condensate through the flue gas-condensate heat exchanger, and the temperature of the condensate is further increased by the absorption heat pump. Combined with the heat storage component, the flow direction of the condensate is controlled according to the temperature of the condensate to achieve step-by-step utilization of waste heat.

Benefits of technology

It improves the overall efficiency of waste heat recovery, converts intermittent waste heat into a dispatchable energy storage form, enhances the flexibility of energy utilization, matches power grid demand fluctuations, and improves the deep peak shaking capability and economy of power plants.

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Abstract

The invention discloses a flue gas-condensed water waste heat recycling system and method for a deep peak regulation coal-fired power generator set, and the system comprises a flue gas-condensed water heat exchanger which is used for receiving flue gas and condensed water generated by the coal-fired power generator set, and enabling the flue gas and the condensed water to exchange heat, so as to achieve the purpose that the waste heat of the flue gas is transferred to the condensed water; the absorption heat pump is connected with the flue gas-condensed water heat exchanger and is used for receiving the flue gas and the condensed water passing through the flue gas-condensed water heat exchanger so as to continuously transfer the waste heat of the flue gas to the condensed water; the deaerator is connected with the absorption heat pump and is used for receiving condensed water passing through the absorption heat pump; the heat storage assembly comprises a first heat storage unit and a second heat storage unit which are connected with the absorption heat pump, and a control valve arranged between the absorption heat pump and the first heat storage unit and the second heat storage unit; the control valve is used for controlling the flow direction of the condensation water according to the temperature of the condensation water passing through the absorption heat pump. The invention aims to fully utilize the waste heat of the hearth flue gas and the condensed water of the coal-fired power generating unit under the deep peak regulation working condition, convert the intermittent waste heat into a schedulable energy storage form, improve the energy utilization efficiency and the deep peak regulation capability of a power plant, and match the power grid demand fluctuation.
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