Regenerative steam exhaust system of primary reheating unit steam turbines

Abstract

The invention provides a regenerative steam exhaust system of primary reheating unit steam turbines, and belongs to the field of thermal power plant equipment. The regenerative steam exhaust system ofthe primary reheating unit steam turbines comprises a steam turbine set, a nine-stage non-adjustable steam extraction set and first-stage adjustable extract steam, the steam turbine set comprises a plurality of steam turbines, the steam turbines are connected with non-adjustable extract steam corresponding in the nine-stage non-adjustable steam extraction set, the steam turbine set comprises thehigh-pressure steam turbine, the medium-pressure steam turbine and the low-pressure steam turbine, the first-stage adjustable extract steam is connected with the high-pressure steam turbine, the first-stage adjustable extract steam is further connected with a mark-zero high-pressure heater, and the mark-zero high-pressure heater and all stages of heaters are sequentially connected through a watersupply pipeline. According to the regenerative steam exhaust system of the primary reheating unit steam turbines, heat rate is good, compared with nine-stage regeneration unit, fuel saving is obvious,the unit fuel cost is greatly saved, through actual engineering calculation, a single million unit is provided with a regenerative steam extraction system of "9+1" stages, the comprehensive benefit of 20 years is about 30 million yuan, and the economic benefit is remarkable.

Description

technical field [0001] The invention relates to the field of thermal power plant equipment, in particular to a heat recovery steam extraction system for a steam turbine of a primary reheat unit. Background technique [0002] In recent years, the government has attached great importance to energy saving, land saving, and environmental protection. The high price of coal has also brought increasing pressure on power generation companies. Major domestic power generation companies have put forward high energy saving requirements for power plants. Consumption reduction and environmental protection goals. The heat extraction system of the steam turbine of the primary reheat unit uses steam to heat the boiler feed water to reduce the loss of the cold source. It is the most basic component of the thermal system and the system that has the greatest impact on the thermal economy of the steam turbine. Its optimization has a significant impact on the thermal economy of the whole plant. ...

AI Technical Summary

Problems solved by technology

With the increase of the feed water temperature of the newly built unit, the increase of the number of heat recovery stages of the steam turbine, the thermal economy of the steam turbine at full load has been significantly improved, but the thermal economy of the unit in the medium and low load conditions has not been greatly improved.

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