Secondary reheating turbine with parallel superhigh pressure cylinders

Abstract

The invention relates to the technical field of thermal generator sets, in particular to a secondary reheating turbine with parallel superhigh pressure cylinders. The secondary reheating turbine comprises a main turbine system and an auxiliary superhigh pressure cylinder; the main turbine system comprises a superhigh pressure cylinder, a high pressure cylinder, a medium pressure cylinder, low pressure cylinders, a first reheater and a second reheater; a steam inlet of the superhigh pressure cylinder communicates with a high pressure steam pipeline, and a steam exhaust port communicates with the inlet of the first reheater by a first cold reheating steam pipeline; a steam inlet of the auxiliary superhigh pressure cylinder communicates with the high pressure steam pipeline by an auxiliary steam inlet pipeline, the steam exhaust port communicates with the first cold reheating steam pipeline by an auxiliary steam exhaust pipeline, and the auxiliary steam inlet pipeline is provided with an auxiliary steam inlet valve block; the outlet of the first reheater communicates with the steam inlet of the high pressure cylinder; the steam exhaust port of the superhigh pressure cylinder is connected to a first steam extracting pipeline leading to a first heater, and the first heater and a first bypass are connected in parallel. The economy of part of loads can be improved, the economy of high loads is improved, and the economy of rated loads is ensured.

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...

AI Technical Summary

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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