High-efficient combined heat and power generation system with joint heat supply under medium and low pressures

Abstract

The invention discloses a high-efficient combined heat and power generation system with joint heat supply under medium and low pressures. The system is composed of an overheat steam boiler, an extraction backpressure gas turbine, a generator, a steam feed pump, a deaerator, 1# / 2# high pressure heaters, shaft seal / water supplementing heaters, medium / low pressure heat supply main pipes, and medium / low pressure steam cooling devices. The system provides steam and electricity at medium and low pressures at the same time to meet the demand of different users and the step use of heat energy. By means of steam of low-grade heat energy, the steam feed pump is driven to replace a traditional electric feed pump, thus the high-grade power energy is saved. The chemical desalting water is comprehensively recycled, the water resource use is optimized. The chemical desalting water is heated step by step from the fourth grade through shaft seal gas leakage and low-grade heat energy steam to enter theoverheat steam boiler; the chemical desalting water after being heated grade by grade can generate high-grade high-temperature and high-level steam in the overheat steam boiler; the in-depth gradientutilization of heat energy improves the whole efficiency of the unit.

Description

technical field [0001] The invention belongs to the technical category of cogeneration of heat and power; in particular, it refers to a high-energy-efficiency cogeneration system of heat and power that adopts a steam-driven feed water pump and utilizes thermal energy in deep cascades for industrial users of medium and low pressure steam. Background technique [0002] In December 2015, the total installed capacity of power generation in China reached 1.53 billion KW. Thermal power, hydropower, nuclear power, wind power and solar energy and other new energy sources, the corresponding installed capacity and the proportion of the total installed capacity are 990 million KW, 65.56%, 320 million KW, 21.1%, 26.08 million KW, 1.7%, 1.72% 100 million KW, 11.64%. my country's resource endowment of "rich coal, poor oil, and little gas" determines that the coal-based power generation method will be maintained for a considerable period of time in the foreseeable future. Sustainable ene...

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Problems solved by technology

[0017] The above-mentioned intellectual property achievements include the structural design of steam turbine units, the application of heat pump combined with steam heat exchanger in cogeneration, the joint dispatch of back pressure cogeneration and pure condensing steam thermal power, and the application of steam accumulator in cogeneration. Discussion on the application, the research results are of reference value; there are limitations in the lack of exploration of supporting cogeneration in industrial agglomeration areas or industrial parks; therefore, it is necessary to make further innovative designs

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