Water-heat-power cogeneration system and method based on seawater desalination and cascade energy consumption

Abstract

The invention provides a water-heat-power cogeneration system and method based on seawater desalination and cascade energy consumption, and relates to the field of water-heat-power cogeneration. The system comprises a seawater desalination system, a gradient utilization system, an energy storage frequency modulation system and a station service system. The seawater desalination system is configured to desalinate drainage water of a secondary circulation cooling tower through desalination equipment to obtain desalted water and output the desalted water, and the desalination equipment takes power from the station service system; the gradient utilization system is configured to obtain steam output by a steam turbine generator unit for gradient utilization and output high-pressure industrial steam, medium-pressure industrial steam and low-pressure industrial steam respectively; and the station service system comprises working sections of two units and is connected with a back pressure machine and the energy storage frequency modulation system, and the back pressure machine and the energy storage frequency modulation system are merged into a station service network. Fresh water is prepared through seawater desalination, and the water supplementing requirement of the back pressure machine and a temperature and pressure reduction bypass system for supplying industrial steam to the outside is met. Power generated by a backpressure generator has access to the station service system, so that station service power is saved; the power for seawater desalination is from the station service system; and co-production of water, heat and power is realized.

Description

technical field [0001] The present disclosure relates to the field of cogeneration of water, heat and power, in particular to a system and method for cogeneration of water, heat and power based on seawater desalination and cascade energy use. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] With the saturation of the electricity market, it has become a development trend of the industry for thermal power plants to supply industrial steam and civil heating to the outside world. The condensed water used for supplying industrial steam to the outside world is usually not recovered, which will cause huge loss of steam water; sewage needs to be discharged for civil heating, and a large amount of steam water will also be lost. Therefore, the heat supply transformation and steam supply transformation of thermal power plants usually need to increa...

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Problems solved by technology

However, on the basis of the large unit (large power generation), a small backpressure machine (the power generation is relatively much smaller) is added, which prolongs the response time of the entire power plant (including the large unit and small backpressure machine) to the grid dispatching command, which is quite Because of increasing the complexity of power grid scheduling, the power grid usually

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