A double reheat steam turbine with parallel ultra-high pressure cylinders

Abstract

The present invention relates to the technical field of thermal power generating sets, in particular to a double reheat steam turbine with parallel ultra-high pressure cylinders, including a main steam turbine system and an auxiliary ultra-high pressure cylinder. The main steam turbine system includes an ultra-high pressure cylinder, a high pressure cylinder, a medium pressure Cylinder, the first reheater and the second reheater, the steam inlet of the ultra-high pressure cylinder is connected with the high-pressure steam pipeline, and the steam exhaust port is connected with the inlet of the first reheater through the first cold reheat steam pipeline; the auxiliary The steam inlet of the ultra-high pressure cylinder communicates with the high-pressure steam pipeline through the auxiliary steam inlet pipeline, and the steam exhaust port communicates with the first cold reheat steam pipeline through the auxiliary steam exhaust pipeline, and the auxiliary steam inlet pipeline is provided with an auxiliary steam inlet valve group; The outlet of the first reheater communicates with the steam inlet of the high-pressure cylinder; the exhaust outlet of the ultra-high pressure cylinder is connected with a first steam extraction pipeline leading to the first heater, and the first heater is connected in parallel with the first bypass. It can improve the economy of partial load, improve the economy of high load at the same time, and ensure the economy of rated load.

Description

technical field [0001] The invention relates to the technical field of steam turbines, in particular to a double reheat steam turbine with parallel ultra-high pressure cylinders. Background technique [0002] In recent years, under the influence of the macro economy, it has become normal to maintain low-speed growth in electricity consumption. At the same time, the capacity of my country's power grid has continued to expand, the energy structure has been continuously adjusted, and the proportion of renewable energy has steadily increased. In order to ensure the base load of renewable energy, thermal power units will participate in deep peak regulation, and it is an inevitable trend to operate under low-load conditions for a long time. The design focus of thermal power units has also changed, from the original guarantee of high efficiency at base load to that of ensuring high efficiency at full load. [0003] At present, the domestic power industry uses three different desig...

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Problems solved by technology

But at the same time, in order to meet the power generation capacity of the steam turbine unit, it is necessary to turn on the bypass in turn, which reduces the final feed water temperature and thermal cycle efficiency, and significantly reduces the economy of the steam turbine unit under high load conditions.

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