Direct air-cooling heating and power cogeneration unit peak regulation system based on heat storage tank

Abstract

The invention provides a direct air-cooling heating and power cogeneration unit peak regulation system based on a heat storage tank. The peak regulation system comprises a boiler, a steam turbine, a direct air-cooling radiator, an exhaust device, a heat exchanger and the heat storage tank, the steam output end of the boiler is connected with the input end of the steam turbine, the steam output endof the steam turbine is connected with the input end of the direct air-cooling radiator and one input end of the heat exchanger through pipelines, the condensate water output end of the direct air-cooling radiator and one output end of the heat exchanger are connected with the input end of the exhaust device through pipelines, the output end of the exhaust device is connected with the input end of the boiler through an inlet pipeline, the heat storage tank is connected with the other input end of the heat exchanger through a cold water pipeline, the other output end of the heat exchanger is connected with the heat storage tank through a hot water pipeline, the hot water pipeline is connected with the inlet pipeline through a first branch, and the cold water pipeline is connected with theinlet pipeline through a second branch. The peak regulation system not only can reduce the back pressure of the unit and improve the output of the unit when the ambient temperature in summer is high,but also realizes the peak regulation operation of the direct air-cooling heat and power cogeneration unit in winter, thereby improving the economical efficiency of the unit.

Description

technical field [0001] The invention belongs to the technical field of direct air-cooled heat and power cogeneration units, and in particular relates to a peak regulation system of direct air-cooled heat and power cogeneration units based on heat storage tanks. Background technique [0002] There are two cooling methods for steam turbine exhaust in thermal power plants: wet cooling and air cooling. In the water-scarce areas of the north, air cooling is mainly used. Air cooling systems generally use air to directly cool steam turbine exhaust or use air to cool and circulate. The water indirectly cools the exhaust steam of the steam turbine to form a closed system, which does not have the water consumption loss of the wet circulating cooling water, so that the total water consumption of the whole plant of the power plant is reduced by about 80%. The early air-cooled units mainly used the direct air-cooled system. The antifreeze performance of the direct air-cooled unit is bett...

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Problems solved by technology

[0003] At present, when the direct air-cooling unit operates at peak load in summer, some units will carry out peak cooling system transformation to reduce back pressure. Common methods include: peak spray cooling, external peak cooling system (evaporative cooler, surface cooling device); the peak spray mainly uses high-pressure desalted water to atomize through the nozzle, and then sprays it into the air at the inlet of the radiator to reduce the air temperature, but this method is limited by the environmental conditions, and it is easy to cause fouling on the surface of the air-cooled radiator Aging phenomenon, the external peak cooling system requires additional heat exchangers and cooling devices (evaporative coolers, surface coolers), the system requires a large investment, requires a large land area, and the system is relatively complex

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