A method for controlling the operating pressure of a recuperative steam turbine
A control method and technology of operating pressure, applied in steam engine installations, mechanical equipment, machines/engines, etc., can solve the problem of increasing the thermal stress of components, not being able to ensure the pressure of the deaerator and the back pressure of the regenerative steam turbine at the same time, and increasing the exhaust temperature, etc. question
Active Publication Date: 2020-11-17
XI AN JIAOTONG UNIV
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Problems solved by technology
The deaerator is a pressure vessel. Too high pressure of the deaerator will cause accidents. Too high back pressure of the reheating steam turbine will increase the exhaust steam temperature and increase the thermal stress of the components. Too low back pressure will cause the stress of the final diaphragm of the steam turbine to increase, seriously damage accidents
Therefore, it is very important to maintain the deaerator pressure and the back pressure of the recuperative steam turbine system within the allowable range, and simply adjusting the flow regulating valve or the steam inlet regulating valve cannot guarantee the pressure of the deaerator and the back pressure of the recuperative steam turbine at the same time. Back pressure up to control standard
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[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0018] Such as figure 1 As shown, one end of the regenerative steam turbine 16 drives the feedwater pump 10 , and the other end drives a small generator 15 . The speed of the regenerative steam turbine is fixed at 3000 r / min. The power generated by the recuperative steam turbine is much higher than the consumption power of the feed water pump during design, so under certain circumstances, the back pressure adjustment of the recuperative steam turbine 16 is not limited by the power of the recuperative steam turbine. The last stage of the regenerative steam turbine 16 is a hybrid low-pressure heater 7, and the steam flow rate entering the low-pressure heater 5 is adjusted through the flow regulating valve 6. The condensed water enters the deaerator 9 through the condensed water pump 8, and the steam extraction of the deaerator 9 It com...
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The invention provides a regenerative steam turbine operation pressure control method, and relates to the technical field of energy sources and power. The regenerative steam turbine operation pressurecontrol method is mainly used for solving the problem of pressure lifting of a deaerator due to the fact that the steam admission quantity of a regenerative steam turbine is higher than a steam usagequantity of a regenerative heater. A regenerative steam turbine system comprises a boiler, a main steam turbine, the regenerative steam turbine, a regenerative steam turbine steam admission regulating valve, an electric generator, a low-pressure heater, a high-pressure heater, a condenser, a flow regulating valve, the deaerator, a deaerator steam admission regulating valve and a feed water pump.It is ensured that the deaerator and backpressure of the regenerative steam turbine is in a reasonable range by judging the backpressure of the regenerative steam turbine and using different control strategies, by adopting the control mode, a control system can be simplified to a certain degree, the unit efficiency is improved, irreversible loss of the regenerative steam turbine system is reduced,and smooth operation of the regenerative steam turbine system is maintained.
Description
technical field [0001] The invention relates to the technical field of energy and power, in particular to a method for controlling the operating pressure of a regenerative steam turbine. Background technique [0002] With the increase of thermal power unit capacity and parameters, the degree of steam superheat increases significantly, leading to an increase in irreversible losses, which limits the improvement of the efficiency of high-parameter units. Passing high-parameter steam into the regenerative steam turbine, and using the regenerative steam turbine to provide steam extraction for high-pressure heaters and deaerators can significantly reduce steam superheat, reduce irreversible losses, and improve efficiency. [0003] However, since the regenerative steam turbine is a back-pressure turbine, the steam pressure is easily affected by the steam extraction volume of the regenerative heater, which adds a lot of difficulties to the power control and pressure control of the r...
Claims
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IPC IPC(8): F01K13/02F01K7/38
CPCF01K7/345F01K7/38F01K13/02
Inventor 刘继平张顺奇刘明严俊杰
Owner XI AN JIAOTONG UNIV