Medium and low pressure industrial steam supply method and system for regulating medium and low pressure connecting butterfly valve combined with hot press

Abstract

The invention provides a medium-pressure and low-pressure industrial steam supply method and system through medium-pressure and low-pressure communication butterfly valve adjustment and hot press adoption. The system mainly comprises a turbine high pressure cylinder, a medium pressure cylinder, a low pressure cylinder, a generator, a hot press, a medium-pressure and low-pressure communication pipe butterfly valve, a reheat steam medium pressure cylinder steam inlet pipe, an industrial steam supply outlet pipe and accessories. Reheat steam and medium pressure cylinder exhaust steam can be matched for forming target parameter steam with the pressure between the pressure of the reheat steam and the pressure of the medium pressure cylinder exhaust steam through the hot press; when the load change of a unit is large and the load is lowered obviously, lowering of the pressure of the medium pressure cylinder exhaust steam cannot meet the steam extraction requirement, then the opening degree of the medium-pressure and low-pressure communication pipe butterfly valve is appropriately reduced so that the upstream pressure can be increased for meeting the requirement of the industrial steam extraction pressure, but the throttling loss is large through the method; when the load is lower than a certain value, little reheat steam and the medium pressure cylinder exhaust steam extracted through jetting of the hot press are matched for forming the target steam meeting the industrial steam supply requirement through the system, and therefore the purposes of energy conservation and emission reduction can be realized, and the economical efficiency of utilizing the system is higher than that of throttling by the medium-pressure and low-pressure communication butterfly valve.

Description

technical field [0001] The invention relates to medium and low pressure industrial steam supply in a power plant, in particular to a medium and low pressure industrial steam supply method and system for regulating a medium and low pressure connecting butterfly valve combined with a hot press. Background technique [0002] In today's society, energy conservation and environmental protection are becoming more and more important. With the adjustment of national policies year by year, energy conservation and environmental protection have been highly valued by all parties. Most of the 600MW and 1000MW thermal power generation units built in the early period are pure condensing units, and the thermal efficiency of cogeneration heating units is higher. It is much higher than the pure condensing unit, which is an important measure for energy saving. In addition to the guidance of national policies, more and more large-scale pure condensing units have been transformed into extraction ...

AI Technical Summary

Problems solved by technology

[0004] 1. Poor adaptability to unit load fluctuations

[0005] 2. When the load of the unit is low, the throttling loss is large and the energy saving benefit is poor

[0006] 3. Lack of more economical adjustment methods

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