System for heating condensate water by extracting residual heat of power plant through heat pump

Abstract

The invention relates to a system for heating condensate water by extracting residual heat of a power plant through a heat pump, belonging to the technical field of thermoelectricity. The system comprises a boiler, a steam turbine, a condenser, a condensate water pump, a low-pressure bleeder heater, a deaerator, a high-pressure bleeder heater, a water-cooling tower, a water-circulating pump, a chemical water treater, a heat pump unit, a heat exchanger and a by-pass valve, wherein the boiler, the steam turbine, the condenser, the condensate water pump, the low-pressure bleeder heater, the deaerator and the high-pressure bleeder heater form a loop; and the condenser, the water-cooling tower, the heat pump unit, the heat exchanger and the by-pass valve form one loop. The invention can recover the heat energy in the cooling water of the power plant, reduces the evaporation capacity of the cooling circulating water, and saves energy and water.

Description

technical field [0001] The invention belongs to the technical field of thermoelectricity, in particular to the utilization of waste heat of power plants. Background technique [0002] In thermal power plants, the steam drives the steam turbine to generate electricity. The steam that drives the steam turbine to generate electricity becomes exhausted steam that can no longer do work after passing through the steam turbine. When it passes through the condenser, it is cooled by circulating cooling water into liquid water and then returns to the boiler for circulating cooling. The water removes the heat from the exhaust steam and discharges it to the atmosphere through the cooling water tower. [0003] Existing power plant systems such as figure 1 As shown, the system includes a boiler 1 connected by pipelines, a steam turbine 2, a condenser 3, a condensate pump 6, a low-pressure recuperation heater 7, a deaerator 8, a chemical water processor 9, a high-pressure recuperation hea...

AI Technical Summary

Problems solved by technology

In this way, not only a large amount of heat energy is discharged into the atmosphere, resulting in a great waste of energy and heat pollution to the air, but also because the cooling circulating water will evaporate in large quantities when passing through the cooling water tower, resulting in a large waste of water resources. Water pumps and cooling tower fans also consume a lot of electricity

[0006] Especially in summer, the temperature of the cooling circulating water after passing through the condenser can reach 40-50°C. It is not only a pity that the heat is released into the atmosphere, but also causes a large amount of water consumption due to the evaporation of water, and it is harmful to the city. cause serious heat pollution

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