Safety protection system and method for cutting low-pressure cylinder operation of thermal power unit

Abstract

The invention belongs to the technical field of thermal power unit operation and relates to a safety protection system and method for the cutting low-pressure cylinder operation of a thermal power unit. The system comprises equipment of an original unit, and a hydraulic control butterfly valve of a middle-low cylinder steam guide pipe which can be completely closed is reformed; and a cooling steamsystem of a low-pressure cylinder is additionally arranged, a water spray desuperheating system of the low-pressure cylinder is reformed, and various pressure sensors, a flow measuring device and a galvanic couple resistor are additionally arranged. According to the safety protection method, a protection method for interlocking opening and allowing closing of the hydraulic control butterfly valveis designed; a protection method for interlocking closing of an extraction stop valve and an extraction check valve and a protection method for manual closing are designed; a protection method for interlocking opening and allowing closing of an extraction quick closing regulating valve is designed; a protection method for interlocking opening and interlocking closing of a cooling steam regulatingvalve is designed; and a protection method for interlocking opening and interlocking closing of a low-pressure cylinder water spray regulating valve and a protection method for high or low exhaust pressure of a medium-pressure cylinder are designed, so that the operation safety of a steam turbine unit is protected during the cutting cylinder process of the thermal power unit.

Description

Technical field [0001] The invention belongs to the technical field of the operation of a thermal power unit, and specifically relates to a thermal safety protection system and method for the operation of the thermal power unit with a low pressure cylinder removed. Background technique [0002] In recent years, large-scale coal-fired power generating units in neighboring cities in northern my country have been transformed into cogeneration units to provide heat to urban residents during the heating period. The power generation load of the units increases with the increase in heat supply. At the same time, new energy sources such as wind power and photovoltaics The installed capacity of electric power continues to grow rapidly. Wind power and photovoltaics provide a large amount of clean energy, but there are also the randomness and instability of their power output, which poses a huge challenge to the safe operation of the power system and the guarantee of power supply. At present...

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Problems solved by technology

[0006] During the operation mode of the steam turbine from the extraction condensing unit to the back pressure unit, if the coordination and cooperation of the hydraulic control butterfly valve, the quick-closing regulating valve of the extraction steam and the regulating valve of the cooling steam are not reasonable, or the exhaust pressure of the medium pressure cylinder and the inlet pressure of the low pressure Unreasonable control of parameters such as steam pressure and low-pressure cylinder exhaust temperature, or unreasonable control of low-pressure cylinder cooling steam flow and steam turbine exhaust temperature higher than the specified value will affect the safe operation of the steam turbine, causing the unit to stop or even be damaged sex accident

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