Low-vacuum-operating circulating water heating system of steam turbine in thermal power plant

Abstract

The invention belongs to the technical field of concentrated heating system, in particular to a low-vacuum-operating circulating water heating system of a steam turbine in a thermal power plant. Currently, a steam-extraction and heat-exchange heating method is adopted, only 15 to 30 percent of steam generated in a boiler is used for heating, while over 70 percent is condensed with the heat thereof discharged into the air through circulating water from a cold water tower, so serious resource waste is caused. The invention provides the low-vacuum-operating circulating water heating system of the steam turbine in the thermal power plant, which comprises a condenser, a first-stage heat-supply-network cycle pump, a balance pipe, a second-stage heat-supply-network cycle pump and a peak heater, so a heat-supply area or a temperature and the load of the power plant can be adjusted flexibly. The heat released by condensed steam, which accounts for over 50 percent of the total heat and is discharged from the cold water tower of the thermal power plant in the prior art, is recycled; and the heating efficiency of the thermal power plant is increased from 50 percent to over 80 percent.

Description

Technical field: [0001] The patent of the present invention relates to the technical field of central heating, in particular to a low-vacuum circulating water heating system for steam turbines in thermal power plants. Background technique [0002] At present, the usual heat supply method in China is to use steam boiler or hot water boiler for heat supply; steam boiler is generally equipped with steam turbine generator, and the steam turbine adopts steam extraction unit, which generates power from high-grade steam and then extracts part of the steam to heat the heating medium water , In the steam turbine, more than 50% of the heat is taken away by the circulating cooling water in the condenser, and discharged into the atmosphere through the cooling tower cooling, resulting in a huge loss of cold source. Contents of the invention [0003] The purpose of the patent of the present invention is to provide a steam turbine circulating water heating system in a thermal power plant...

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Problems solved by technology

[0002] At present, the usual heat supply method in China is to use steam boiler or hot water boiler for heat supply; steam boiler is generally equipped with steam turbine generator, and the steam turbine adopts steam extraction unit, which generates power from high-grade steam and then extracts part of the steam to heat the heating medium water , more than 50% of the heat in the steam turbine is taken away by the circulating cooling water in the condenser, and discharged into the atmosphere through the cooling tower, resulting in a huge loss of cold source

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