Large temperature difference centralized heating system using power plant waste heat and work method

Abstract

The invention discloses a large temperature difference centralized heating system using power plant waste heat and a work method. A two-stage water-water heat exchanger and a two-stage power drive heat pump unit are arranged in a two-stage net heat exchange station, a circular cooling water waste heat recycling heat exchanger, a circular cooling water waste heat recycling electric heat pump unit,steam-water heat exchanger and a water-water heat exchanger are arranged in a first-stage pipe network heat exchange station, on the premise of ensuring the secondary network normal water supply temperature, water supply temperature of a primary heat network can be greatly reduced, steam consumption of a heat supply system is greatly reduced, and the use proportion of thermal power plant circularwater waste heat is greatly improved. Meanwhile, it is ensured that a secondary pipe network has the normal water supply temperature and water supply and returning temperature difference, the water supply temperature of the primary heat network is reduced to 80 DEG C, the water supply temperature of a secondary pipe network reaches about 70 DEG C, and the normal running flow of the secondary pipenetwork and energy-saving running of the circular water pump are ensured.

Description

technical field [0001] The invention relates to the field of central heat supply, in particular to the field of large temperature difference central heat supply using an electric heat pump to recycle and utilize waste heat from a power plant. Background technique [0002] Combined heat and power technology conforms to the energy utilization principle of "high energy and high use, low energy and low use", and is the most economical form of heat source for central heating systems. At present, the combined heat and power system mostly adopts the extraction condensing heating generator set. The characteristics of this unit are: the high-temperature and high-pressure steam produced by the power plant boiler first enters the steam turbine generator set to generate electricity, and after falling to a certain pressure, part of it is pumped out from the steam turbine and enters the heat exchange unit to heat the circulating water of the central heating system, which is used as the ce...

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Problems solved by technology

[0009] In order to overcome the low temperature of secondary network water supply, low efficiency of absorption heat pump unit, unstable unit performance, serious attenuation of refrigeration capacity, high equipment investment and complex system in the existing centralized heating technology using waste heat from power plants Defects, the present invention proposes a central heating system with a large temperature difference that can meet the parameter requirements of the central heating system, has stable performance and has high energy efficiency

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