Heating system and method by using power plant steam turbine bearing cooling water through heat pump

Abstract

The invention belongs to a heating system and method by using a power plant bearing cooling water heat pump in the field of energy. The system comprises a steam turbine, a steam turbine bearing cooling system, a steam absorption heat pump, a water-water heat exchanger, a low-pressure heater, a heating network heater, corresponding pipelines and auxiliary equipment. The system uses power plant bearing cooling water as a low-temperature heat source of the absorption heat pump and uses medium-pressure steam applying work in a steam turbine unit as a driving heat source of the heat pump; the heatsources exchange heat in the absorption heat pump system; discharged water is transferred to a regenerative heating system of the steam turbine unit to be used as boiler feed water; heat which is obtained by the heat pump system from a high-temperature heat source is solely supplied to heat users in winter or is coupled with a traditional cogeneration system to be supplied to heat users in winter; and the condensed water of the steam turbine unit is heated through a regenerative heater of the water-water heat exchanger in summer to improve the temperature of boiler feed water. Therefore, the bearing temperature of the power plant steam turbine unit is lowered, the safe operation of the steam turbine unit is realized and the thermal economy of the steam turbine unit is improved by outputting heat for heating through the heat pump.

Description

technical field [0001] The invention belongs to the field of energy, and particularly relates to a heating system and method for a steam turbine bearing cooling water heat pump in a power plant. The system reduces the bearing temperature of the steam turbine unit bearing in the power plant through the operation of the steam turbine bearing cooling water heat pump in the power plant and realizes the safe operation of the unit. On the one hand, the obtained heat is output to the outside through the heat pump for heat supply, which realizes the cascade utilization of energy and improves the thermal economy of the steam turbine unit system. technical background [0002] The bearing cooling of the steam turbine unit in a thermal power plant is one of the problems that affect the safety of the unit operation. When the steam turbine is running at high speed, the internal friction of the bearing will generate a lot of heat. If the bearing temperature is too high, it will cause the un...

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Problems solved by technology

In actual operation, the cooling water system here needs the external environment to cool down and lower the temperature, and a large amount of heat is wasted into the environment. On the other hand, in summer, due to the high ambient temperature, the cooling effect is poor, and the cooling effect of the bearing is often not good enough to affect the entire steam turbine. group run

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