Dual-branch heat supply system of power-heat co-generation steam turbine

Abstract

The invention relates to the technical field of steam turbines, in particular to a dual-branch heat supply system of a power-heat co-generation steam turbine. The dual-branch heat supply system of the power-heat co-generation steam turbine comprises a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder and a reheater. A steam vent of the high-pressure cylinder communicates with an inlet of the reheater through a cold reheat steam pipeline. An outlet of the reheater communicates with a steam inlet of the intermediate-pressure cylinder through a heat reheat steam pipeline. The steam inlet of the intermediate-pressure cylinder is provided with a reheat steam inlet valve set. A first cold section steam extraction branch and a second cold section steam extraction branch which are connected in parallel are connected to the cold reheat steam pipeline. The first cold section steam extraction branch communicates with a first heat supply network and is provided with a first cold section steam extraction fast-closing adjusting valve. The second cold section steam extraction branch communicates with a second heat supply network and is provided with a second cold section steam extraction fast-closing adjusting valve. Through the two cold section steam extraction branches, steam of different parameters can be obtained through extraction and is introduced into the two heat supply networks with the steam extraction demand parameters matched with the parameters of the steam correspondingly, and simultaneous heat supply to the two heat supply networks is achieved.

Description

technical field [0001] The invention relates to the technical field of steam turbines, in particular to a dual-branch heat supply system for a steam turbine with combined heat and power supply. Background technique [0002] The steam turbine is one of the key power equipment in the construction of a power station, and it is an energy conversion device that converts thermal energy into mechanical energy and then into electrical energy. The high-temperature and high-pressure steam produced by the boiler converts the thermal energy and pressure potential energy into the mechanical energy of the steam turbine through the steam turbine, and drives the output shaft of the steam turbine rotor to do work. The mechanical energy is transmitted to the generator through the output shaft of the steam turbine rotor, thereby converting the mechanical energy into electrical energy . [0003] The gas-steam combined cycle refers to using the gas turbine as a pre-turbine, using the waste heat...

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Problems solved by technology

[0005] The existing heat and power combined cycle system only has one steam extraction pipeline to extract steam and send it to the heating network for heating, so it can only provide heat energy for one heating network, and cannot simultaneously provide heat for two heating networks with different extraction demand parameters. heating

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