Efficient and energy-saving low-pressure cylinder full-cut heating and cooling system

Abstract

The invention relates to an efficient and energy-saving low-pressure cylinder full-cut heating and cooling system. The efficient and energy-saving low-pressure cylinder full-cut heating and cooling system comprises a water feed pump turbine, a steam turbine low-pressure cylinder, a steam turbine intermediate pressure cylinder, a heat supply network heater and a steam ejector, the heat supply network heater is connected with the steam turbine intermediate pressure cylinder, a steam turbine intermediate pressure four-section steam extraction pipeline is arranged on the steam turbine intermediatepressure cylinder, connected with the steam ejector through a first isolation valve and used for sending the superheated steam delivered by the steam turbine intermediate pressure four-section steamextraction pipeline into the steam ejector as a power steam source through the first isolation valve, the water feed pump turbine is connected with the steam ejector through a second isolation valve and used for sending the exhaust steam of the water feed pump turbine into the steam ejector as a low-pressure steam source through the second isolation valve, the steam ejector is connected with the steam turbine low-pressure cylinder and used for sending the power steam source and the low-pressure steam source to the steam turbine low-pressure cylinder after matching the pressure and temperatureso as to cool a low-pressure rotor and blades. The efficient and energy-saving low-pressure cylinder full-cut heating and cooling system can improve the utilization rate of energy of a thermal power unit.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a high-efficiency and energy-saving low-pressure cylinder full cut heat supply and cooling system. Background technique [0002] With the continuous advancement of central heating projects and auxiliary service measures in the north, the heat supply demand of cogeneration units continues to increase. However, the environmental protection problems caused by small boiler heating are more prominent, and large cities have paid more attention to the issue of clean heating in recent years. Improving the heating capacity of existing units without adding new units is the main means to solve the heating demand. At present, the low-pressure cylinder full-cut heating technology is widely used. [0003] In the working condition of full heat supply of the low-pressure cylinder, the exhaust steam of the feedwater pump steam turbine is the main heat load of the condenser, whic...

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Problems solved by technology

[0004] At present, in the heating condition of the low-pressure cylinder, the cooling steam of the low-pressure cylinder comes from the final exhaust steam of the medium-pressure cylinder. When the main steam flow rate remains unchanged, the cooling steam extracted by the middle exhaust will inevitably affect the heat supply capacity of the unit. , while generating redundant cold junction losses

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