Single-shaft heating steam turbine unit capable of running as steam-extraction turbine unit, back-pressure turbine unit and pure condensing turbine unit

Abstract

The invention relates to a single-shaft heating steam turbine unit, in particular to a single-shaft heating steam turbine unit capable of running as a steam-extraction turbine unit, a back-pressure turbine unit and a pure condensing turbine unit, which solves the problems that steam-extraction heating amount is small and atmospheric heat pollution is increased when a steam-extraction condensing unit is used as a heating unit and the problem of poor economic benefit because a back-pressure turbine cannot run under the condition of small or no heating amount when a back-pressure turbine unit is used as the heating unit. The invention provides two schemes that: first, a steam-extraction condensing turbine is provided with a high pressure cylinder and an independent low pressure cylinder, wherein the high pressure cylinder and the independent low pressure cylinder are connected through an SSS clutch; and the exhaust stream end of the high pressure cylinder is provided with a heating extraction port of the high pressure cylinder; and second, the steam-extraction condensing turbine is provided with an independent low pressure cylinder, a high pressure cylinder and an intermediate pressure cylinder, wherein the intermediate pressure cylinder and the independent low pressure cylinder are connected through an SSS clutch; and the exhaust stream end of the intermediate pressure cylinder is provided with a heating extraction port of the intermediate pressure cylinder. The single-shaft heating steam turbine unit runs flexibly, increases the heating amount by over 20 percent, and is suitable for the heating units of all power.

Description

technical field [0001] The invention relates to a single-shaft heating steam turbine unit. Background technique [0002] Existing large-scale steam extraction and condensing steam turbines have one or more independent low-pressure cylinders connected to the condenser, and the heating and heating are exhausted from the medium-pressure cylinders. During steam extraction operation, a certain amount of cooling steam needs to enter the condenser through the low-pressure cylinder to ensure the normal operation of the steam turbine. This part of the steam does work with low efficiency, and brings a lot of heat into the condenser and discharges it to the atmosphere. This extraction and condensing operation mode not only reduces the heat supply of extraction steam, but also increases thermal pollution to the atmosphere, which is very uneconomical. However, the back pressure machine is used for heat supply, and the heat supply determines the power generation. When there is little o...

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Problems solved by technology

[0003] In order to solve the problem that the use of the extraction condensing unit as the heating unit not only reduces the amount of heat supplied by extraction steam, but also increases the heat pollution to the atmosphere, and the use of the back pressure machine unit as the heating unit exists when the heat supply is less Or when there is no back pressure machine, the back pressure machine cannot operate, resulting in the problem of poor economic benefits; and then a single-shaft heating steam turbine unit that can be used as extraction, back pressure, and pure condensation operation is proposed.

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