Heat-power cogeneration system employing steam heat accumulator

Abstract

The invention discloses a heat-power cogeneration system employing a steam heat accumulator, comprising a superheating steam furnace, a back pressure turboset, a generator set, the steam heat accumulator, a steam consumer, a drainage pump, a drainage water tank, a water feed pump and a heat exchange type heat pump, wherein a low-pressure steam consumer outlet and a high-pressure steam consumer outlet are connected to the drainage pump respectively; the outlet of the drainage pump is connected to the drainage water tank; the outlet of the drainage water tank is connected to the water feed pump; a temperature-decreased pressure reducer outlet is connected to a low-pressure steam consumer through a pressure reducer; the outlet of the back pressure turboset is connected to a high-pressure steam consumer through a booster. The heat-power cogeneration system provided by the invention solves the problem of fluctuation of the steam pressure at the inlet of the back pressure turboset along with the fluctuation of the steam pressure at the outlet, and thereby is stable in power generation; two steam pipelines of high pressure and low pressure are provided to perfectly meet the requirements of different users for steam; therefore, actual requirements of the users are met; and the utilization rate of the steam is increased, while the pollution is reduced.

Description

technical field [0001] The invention relates to a cogeneration system of heat and power using a steam accumulator, which belongs to the technical field of cogeneration of heat and power. Background technique [0002] At present, most of the waste heat generated by my country's metallurgical plants, cement plants and other factories is connected in parallel with the public heat network through steam accumulators to provide heat for users, or directly pulled to the user's end through mobile heat storage vehicles. Studies have shown that using part of the waste heat to generate electricity and implementing cogeneration can increase the utilization rate of waste heat by at least 5%. Because of this, my country's cogeneration has developed rapidly in recent years. During the "Eleventh Five-Year Plan" period, the installed capacity of newly added heat supply units in the country was about 60 million kilowatts. By 2010, the total installed capacity of heat supply units will reach 1...

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Problems solved by technology

Although the steam utilization rate of the back pressure steam turbine is high, the outlet steam can be directly supplied to the user, but because the fluctuation of the inlet steam pressure is determined by the fluctuation of the outlet steam pressure, it is generally used in parallel with the condensing steam turbine or the extraction condensing turbine , but the inlet of the back-pressure steam turbine needs superheated steam, while other steam turbines need ordinary steam, and complex equipment is required in the middle, and the cost is high; there is another way that the back-pressure steam turbine is connected in parallel with the steam heat accumulator, although the solution The problem of the back-pressure steam turbine is solved, but the outlet is low-pressure steam, which obviously does not consider the actual needs of high-pressure steam users

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