System and method for recovering and utilizing waste heat of smoke after wet desulphurization

A wet desulfurization, flue gas waste heat technology, applied in the direction of heat exchanger type, climate sustainability, reduction of greenhouse gases, etc., to achieve the effects of good water quality, elimination of white smoke plumes, and improved energy utilization efficiency

Pending Publication Date: 2019-11-08
HUANENG POWER INT INC +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a system and method for recovering and utilizing waste heat of flue gas after wet desulfurization, so as to solve the technical problems existing in the prior art

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  • System and method for recovering and utilizing waste heat of smoke after wet desulphurization

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Embodiment approach

[0038] see figure 1 As shown, the present invention provides a flue gas waste heat recovery and utilization system after wet desulfurization, including a coal-fired boiler 1, a wet desulfurization tower 4, a flash tower 6, an absorption heat pump 9, a steam turbine 10 and a heat network heater 11;

[0039] The smoke outlet of the coal-fired boiler 1 is connected to the smoke inlet of the wet desulfurization tower 4;

[0040] The steam outlet of the coal-fired boiler 1 is connected to the steam inlet of the steam turbine 10;

[0041] A steam extraction port is provided in the middle of the steam turbine 10, and the steam extraction port communicates with the heat network heater 11 and the absorption heat pump 9 respectively;

[0042] The bottom outlet of the wet desulfurization tower 4 is connected to the inlet of the flash tower 6 through the first slurry pump 5, and the cold slurry outlet of the flash tower 6 is connected to the upper inlet of the wet desulfurization tower 4...

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Abstract

The invention discloses a system and method for recovering and utilizing waste heat of smoke after wet desulphurization. The system comprises a coal-fired boiler, a wet desulphurization tower, a flashevaporation tower, an absorbing type heat pump, a steam turbine and a heating net heater. A smoke outlet of the coal-fired boiler communicates with a smoke inlet of the wet desulphurization tower. Asteam outlet of the coal-fired boiler is connected with a steam inlet of the steam turbine. A steam drawing opening is formed in the middle portion of the steam turbine and communicates with the heating net heater and the absorbing type heat pump. An outlet of the bottom of the wet desulphurization tower communicates with an inlet of the flash evaporation tower through a first slurry pump. A coldslurry outlet of the flash evaporation tower communicates with an inlet in the upper portion of the wet desulphurization tower through a second slurry pump. A negative pressure steam outlet of the flash evaporation tower is connected with a negative pressure steam inlet of the absorbing type heat pump. The system can recover heat of desulfurization slurry in the wet desulphurization tower, the waste heat of the smoke after desulphurization is recovered in depth, the energy utilization efficiency is improved, the heat supply ability of a unit is improved, and the system has remarkable economicbenefits.

Description

technical field [0001] The invention belongs to the field of energy saving and emission reduction of thermal power generation, and in particular relates to a system and method for recovering and utilizing waste heat of flue gas after wet desulfurization. Background technique [0002] The content of water vapor in the flue gas after wet desulfurization of coal-fired cogeneration units is high, and the latent heat of condensation of water vapor is high, resulting in a huge loss of exhaust heat. The deep recovery and utilization of the waste heat of the flue gas including the latent heat of condensation of water vapor can greatly improve the heat supply capacity of the cogeneration unit; at the same time, the water consumption of the unit can be effectively reduced by using the moisture formed by the condensation of water vapor in the flue gas. [0003] The wet desulfurization tower of most coal-fired cogeneration units is close to the critical point of water balance. At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28C3/08F23J15/06F23J15/02F01D15/10B01D3/06
CPCB01D3/06F01D15/10F23J15/02F23J15/06F28C3/08Y02E20/30Y02P70/10
Inventor 周贤彭烁钟迪王保民许世森
Owner HUANENG POWER INT INC
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