The role of valves in the power industry
Electricity is one of Zui's important energy industries. Currently, there are steam, wind, hydro, geothermal, tidal power, and solar power. This article focuses on the selection of some typical control valves in fuel, kerosene, gas, and nuclear power plants. The common point of this type of power station is to vaporize water into steam, which uses steam to drive the gas turbine to drive the generator to generate electricity. The difference is that the energy for converting water into steam is different: natural gas, fuel oil, coal, and atomic reactor. The structure of various power stations is roughly the same. Let us briefly describe the selection of control valves by taking the combined cycle power plant as an example, and then briefly explain the different parts of each power station.
In simple terms, the power flow diagram is actually a circulation process of water and steam. The selection of the control valve in this process is simple and complicated. The simple process medium is simple, only water and steam. The complicated temperature and pressure fluctuation range of water and steam brings a series of problems such as flashing, cavitation, erosion, noise and corrosion. But the first thing to consider is the safety and reliability of the control valve.
Valve requirements: For the starter valve in the two-valve system, anti-cavitation is required, and the V-class is closed. For the composite-type water supply valve, the characteristic valve trim is required to meet the needs of the boiler start-up and normal operation. Generally, the valve selection is fault-off. It should be noted that the general feed water will be treated by adding hydrazine to eliminate the dissolved oxygen.
Control requirements: The boiler feed water pump is safely started and operated to eliminate the damage caused by the flow being too small, the temperature rise is increased, and the water is strongly cavitation. The old power station has a switch-type Zui small flow control valve, as well as a mechanical pump automatic circulation valve.
Valve requirements: anti-cavitation, anti-blocking structure, V-class sealing level, the valve works continuously when the pump starts and stops running, the valve closes after the pump starts normally, the valve is usually fault open.
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