High back pressure coupling large temperature difference heating supply system for air cooling unit and operation method

Abstract

The invention relates to a high back pressure coupling large temperature difference heating supply system for an air cooling unit and an operation method, and belongs to the technical field of combined heat and power generation energy conservation. The high back pressure coupling large temperature difference heating supply system for the air cooling unit comprises a combined heat and power generation unit, a heating network origin station and a secondary heat exchanging station, the combined heat and power generation unit comprises a turbine, an air cooling island and a back pressure condenser, the heating network origin station comprises a heater for heating networks and a hydrophobic heat exchanger, and the secondary heat exchanging station comprises a hot water type absorbed type heat pump and a water-water heat exchanger. The back pressure condenser, the hydrophobic heat exchanger, the heater for the heating networks, the absorbed type heat pump and the water-water heat exchanger are sequentially mounted on a primary network water pipe loop, corresponding valves are opened or closed to realize primary network-water side switching connection in series and in parallel of the backpressure condenser and the hydrophobic heat exchanger and secondary network-water side switching connection in series and in parallel of the hot water type absorbed type heat pump and the water-waterheat exchanger. According to the high back pressure coupling large temperature difference heating supply system for the air cooling unit and the operation method, stepped warming and heating of primary network-water and secondary network-water is realized, the irreversible loss in the heat exchanging process is effectively reduced, and higher practical application value is achieved.

Description

technical field [0001] The invention relates to a high back pressure coupling large temperature difference heating system and an operation method for an air-cooling unit, belonging to the technical field of combined heat and power energy saving. Background technique [0002] With the deepening of smog control in China, the development of central heating and the shutdown of small heating boilers have increasingly become the consensus of the government and the people. The development of urban central heating requires a stable heat source. Therefore, it has become an effective method to transform the existing pure condensing unit or heating unit to improve the heating capacity or to tap and release the heating potential. After the steam discharged into the low-pressure cylinder by the steam turbine of the thermal power plant does work, it enters the condenser to form condensation heat. The condensation heat usually accounts for more than 30% of the total input heat of its prima...

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Problems solved by technology

The second is the patent "a central heating system with a large temperature difference" with the application number 200810101065.X. The main features of the system are (1) on the heat source side, the steam-type absorption heat pump is used to recover the waste heat of the low-temperature circulating water in the thermal power plant, reducing the waste heat of the thermal power plant. (2) On the secondary network side, the hot water absorption heat pump and the water-to-water heat exchanger are connected in series, and the water supply temperature of the secondary network cannot be changed into the hot water absorption heat pump or the water-to-water heat exchanger Adjust the water flow of the secondary network

[0004] The shortcomings of the above two technical measures are: (1) The absorption heat pump unit is installed close to the heat source to achieve large temperature difference heating, but in the heat exchange station far away from the heat source, it is impossible to effectively use the large temperature difference heat supply; ( 2) The method of using steam absorption heat pump to recover the waste heat of circulating water in thermal power plants requires a large investment, which is much higher than the direct low-vacuum heating method. (3) On the secondary network side, the hot water absorption heat pump and water-to-water heat exchanger For series connection, the water supply temperature of the secondary network cannot be adjusted by adjusting the flow rate

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