Cooling intake system for steam turbine condensation and pumping back heat supply and intelligent control method

Abstract

The invention relates to a cooling intake system for steam turbine condensation and pumping back heat supply and an intelligent control method. The cooling intake system comprises a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a heating network heater, a desuperheater, a steam-water separator, a separation water storage box, a dewatering box and a steam condenser.The cooling intake system is reasonable in design, simple in structure and reliable in performance, and can effectively recool cooling steam firstly according to the pressure and the temperature of the cooling steam needed by the steam turbine low-pressure cylinder; the cooling steam is lower in temperature after recooling, so that the low-pressure cylinder can be preferably cooled; and the intelligent operation in the recooling process of the cooling steam is realized, so that the quality of the cooling steam before entering the steam turbine low-pressure cylinder is precisely controlled, and the operation safety of the steam turbine low-pressure cylinder is guaranteed.

Description

technical field [0001] The invention relates to a cooling steam intake system and an intelligent control method for condensing and pumping back heating of a steam turbine. Background technique [0002] At present, my country's policies are gradually emphasizing the promotion of new energy sources and reducing the proportion of thermal power units. For thermal power plants, the exhaust steam of the steam turbine is usually discharged directly through air cooling or water cooling, which causes a huge loss at the cold end. For example, the energy utilization rate of a 300MW subcritical pure condensing unit is about 38%, of which the loss at the cold end accounts for about 45%. After using steam extraction for heating, the energy utilization rate of the unit increases to 60%, but there is still 20% of condensing low-temperature waste heat This part of the heat is difficult to use directly due to its low grade. At the same time, as the power grid accommodates new energy power, ...

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Problems solved by technology

However, if the cooling steam is re-cooled before entering the low-pressure cylinder, the low-pressure cylinder can be cooled better; however, when the cooling steam is re-cooled, there is no effective cooling steam inlet system and control method, which often leads to The humidity of the cooling steam is too high, which poses a great hidden danger to the operation safety of the low-pressure cylinder; how to take effective measures to ensure that the humidity of the cooling steam entering the low-pressure cylinder can meet the requirements. At present, there are no good technical measures in this regard

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