In the thermoelectric industry, the use of control valve conditions more special. Power flow is just water, steam cycle, but in this process control valve selection is simple and complex. Simple refers to the process medium is simple, only water and steam two kinds of complex water and steam temperature and pressure fluctuations range, bringing a series of problems, such as: flash, cavitation, erosion, noise, corrosion and so on. But the first thing to consider is the safety and reliability of the control valve. 1, the water supply valve (main, with the boiler feed valve, water supply control valve) Control requirements: control of boiler water, to ensure that the amount of steam evaporation, to maintain the water level of the boiler (main and auxiliary boiler feed valve system contains two control valves, one Taiwan is used for boiler start-up, one for normal water supply. Working conditions: When the boiler is started, the pressure drop of the valve can reach 100-300 kg, the flow rate is smaller, the pressure difference is smaller during normal operation, the flow rate is large, the flow rate can be The ratio is from 75: 1 to 100: 1. The valve requirements are WCB / WC9, which require cavitation-mitigating, V-level closure ratings for the priming valve in a two-valve system and are required for the compound type priming valve and At the same time to meet the needs of boiler startup and normal operation .Selection of the general valve for the fault off. 2, the minimum flow pump feedwater circulation valve control requirements: the boiler feed pump start and stop the safe operation, eliminating the flow is too small, increasing temperature, Strong cavitation water damage to the pump. Old-fashioned power plants have the use of switch-type minimum flow control valve, as well as the use of mechanical pump automatic cycle valve. Operating conditions: pressure drop 160-350 kg, is the most pressure-tolerant valve in the power station system, the flow rate is 30% of the normal flow rate. Valve requirements: Anti-cavitation, anti-blocking structure, V grade sealing, continuous operation when the pump starts and stops, Pump normally closed after the closure of the valve, the valve is usually open fault. 3, high and low heater trap (water heater hydrophobic, condensate water heater hydrophobic) control requirements: control the position of condensate heater, the timely discharge of condensate , High water level discharge, the normal water level hydrophobic conditions conditions: saturated water, the control valve between the heater pressure is generally 6-30 kg, the last level of the trap directly connected to the condenser or deaerator. Flash scouring, V or VI level seal, the valve is usually open fault. 4, deaerator water level control valve control requirements: to provide the flow to maintain the normal deaerator water level, by adding steam to increase the water temperature to eliminate dissolved in water. Conditions: Start stage flow is small, large temperature differential pressure, normal flow, pressure is small, similar to the water supply valve conditions. : Anti-cavitation is effective at lower flow rate 5, Control requirements of the temperature reducing valve (desuperheater): The high-pressure water is injected into the steam to make the steam temperature reach the control requirements Condition: water, large pressure difference Valve requirements : Various types: nozzle type, auxiliary atomization type, self-contained type and folder type 6, temperature reducing valve (high and low pressure bypass valve) control requirements: the high temperature and high pressure steam to a certain temperature and pressure of steam, Provide a bypass to the steam turbine, the boiler can work independently of the turbine. Conditions: high temperature and high pressure steam. Valve requirements: thermal shock, noise reduction, rapid response.
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