The control of pneumatic valve correct selection of the power industry

power is one of the most important energy sector, steam, wind power, hydropower, geothermal energy, tidal power, solar power, this paper focuses on the choice of some typical control pneumatic valve fuel, kerosene, gas and nuclear power plants. This common ground is to put the power plant steam, steam to drive a generator to produce electric power driven gas turbine water vapor, the difference is the energy change water into steam is: natural gas, fuel oil, coal, atomic pile. Structure similar to the power plant, we first combined cycle power plant as a simple example, pneumatic control valve selection in a brief description of different parts, and then stop. Is actually a power flow of water, steam cycle process simple point of view, and in the process control pneumatic valve is both simple and complex. Is a simple process is very simple, only two kinds of complex water and steam is water and steam temperature and pressure of volatility, as a series of problems: flashing, cavitation, erosion, noise, corrosion. But the first thing to consider is the control of the security and reliability of the pneumatic valve. We adhere to the system flow control pneumatic valve to expand. Vice boiler feed water, water zhu pneumatic valve, pneumatic valve water complex
control requirements: control boiler water level of boiler and steam flow. Working conditions: boiler start-up to - Kg pressure pneumatic valve, the flow in normal operation, flow, flow adjustable ratio: - : small, little pressure. Pneumatic valve requirements: WCB/WC pneumatic valve body material, for the cavitation resistance of pneumatic valve double pneumatic valve system requirements, V class water supply pneumatic valve composite well-off level the adornment of the need to use functions meet the needs of the boiler startup and normal operation. Pneumatic valve failure usually choose by, Note, the general solution of water to remove oxygen that would be to join the hydrazine treatment, the satellite, alloy or other similar adverse reactions, it is best not to use + stellite surfacing methods to cut stainless steel material can be used directly) 。 Pneumatic valve, boiler feed pump minimum flow cycle
control requirements: the boiler feed water pump start-up and safe operation and eliminating flow is too small, temperature increase, water pump cavitation damage. （ The power switch is the minimum flow control using the old type pneumatic valve, pneumatic valve) and the use of mechanical pump automatic cycle 。 Condition: in - Kilograms of pressure drop, is the world's largest power system pressure pneumatic valve, flow is generally normal flow %. Pneumatic valve requirements: resistance to cavitation, block structure, grade V seal level, the pump start and stop the runtime for pneumatic valve, the second after the normal pneumatic pump start switch valve pneumatic valve, pneumatic valve is usually a failure. Hydrophobic pneumatic valve, high/low water heater, water heater control requirements: control the location of condensed water heater, timely condensate, high water discharge, hydrophobic water is normal water level. Condition: medium for saturated water, heater control pneumatic valve differential pressure is commonly - between Kg, the final level of hydrophobic pneumatic valve connected directly to the condenser or deaerator. Pneumatic valve requirements: resistance to flash scour, V or VI seal level, pneumatic valve is usually a failure.
, deaerator water level control pneumatic valve ( DALC） Control requirements: provide traffic maintain the normal water level deaerator eliminated by adding steam temperature gas dissolved in the water. Conditions: a small start-up stage, larger pressure, normal flow, pressure difference, similar to feed water flow pneumatic valve conditions. Pneumatic valve requirements: low flow cavitation effect,
, temperature, and pneumatic valves ( Attemperator)
control requirements: the high-pressure water into steam injection steam temperature control requirements. Condition: medium is water, greater pressure, pneumatic valve requirements: a variety of types: type nozzle, auxiliary atomization type, self-contained and clamp.
, temperature and pressure safety pneumatic valve ( High and low pressure pneumatic valve circuit)
control requirements: the high temperature and high pressure steam to adjust to a certain temperature and pressure steam; To provide a bypass channel turbine, boiler and steam turbine's ability to work independently. Conditions: high temperature and high pressure steam temperature and pressure to reduce. Pneumatic valve requirements: thermal shock, noise reduction and rapid response. Keywords:
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