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First, the boiler system dedicated intelligent frequency control valve selection.
1, water valve: the main, sub boiler feedwater control valve control requirements: control of boiler water to maintain the steam boiler level and steam flow. Operating conditions: When the boiler starts the valve pressure difference up to 10-30MP, the flow is smaller, the normal operation of small pressure, flow, flow adjustable ratio of 75: 1-100: 1. The operation of regulating valve frequent . In order to solve the frequent use of intelligent control valve regulating motor control valve frequency, two action time set at 1 second or more, the soft start time can be set to 1 to 8 seconds. Intelligent variable frequency electric control valve requirements: Body material for the WCB / WC9 (Note that the general water to dissolve the oxygen which will be added to deal with hydrazine, it will SATELLITE6 alloy or other similar alloy Adverse reactions, so it is best not to 316 + STELLITE surfacing method to deal with the valve trim, direct selection of 416 stainless steel). Regulating valve with fast tracking, to overcome the static fine tuning features. Fault status is selected as fault. Electric actuator driven valve should be used by file.
2, the minimum flow boiler feed pump valve control requirements: the boiler feed pump start and run safely, eliminating the flow is too small, increasing the temperature, water erosion caused by strong cavitation damage. Working conditions: pressure drop of 16-35MP, is the most pressure-tolerant valve system in the power plant, the flow is generally 30% of normal flow. Intelligent frequency conversion electric control regulating valve requirements: Intelligent variable frequency electric control valve, twice Set the operation time to 1 second or longer, and set the soft start time slightly longer. Anti-cavitation, anti-blocking structure, V-class seal, the pump starts and stops running continuously when the valve, the valve is usually open for failure. Valve material for WCB / WC9 can also choose 416 stainless steel. Electric actuator driven valve should be used by file.
3, high / low heater trap water heater hydrophobic, condensate water heater hydrophobic control requirements: control the position of condensate heater, timely discharge of condensate, the high water discharge, the normal water level hydrophobic. Condition conditions: medium is saturated water, the pressure between the control valve heater is generally 0.6-3MP kg, the last level of the trap directly connected to the condenser or deaerator. Intelligent variable frequency electric control valve requirements: anti flash flashing, V or VI level seal, the valve is usually open for failure.
4, deaerator water level control valve control requirements: to provide flow to maintain the normal deaerator water level, by adding steam to improve the water temperature to eliminate the dissolved gas. Condition conditions: Start phase flow is smaller, the pressure is larger, the normal flow, pressure is small, the condition is similar to the water valve. Intelligent variable frequency electric control valve requirements: Effective at lower flow anti-cavitation.
5, the temperature control valve (desuperheater) control requirements: high-pressure water jet into the steam to make the steam temperature to control requirements. Condition conditions: medium is water, the pressure difference is bigger. Intelligent variable frequency electric control regulating valve requirements: Types can be diverse, single double seat, ball valve, self-contained type and folder-type butterfly valve.
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 steam; to provide a bypass steam turbine, the steam turbine can work independently. Condition conditions: high temperature and pressure steam temperature and pressure reduction. Valve intelligent frequency control electric door adjustment requirements: with heat sink, thermal shock, noise reduction, rapid response.
Second, heat transfer station system dedicated intelligent frequency control valve
1, heat station steam - steam flow control Control requirements: the high temperature steam to a certain temperature and pressure of steam to plate heat exchanger outlet temperature, control the amount of steam input for heat exchange station energy saving operation. Condition conditions: high temperature steam decompression operation. Intelligent variable frequency electric control valve requirements: with heat sink, thermal shock, noise reduction, rapid response.
2, heat exchange station water - water flow control control requirements: outlet temperature of the plate heat exchanger, control the amount of hot water into the plate heat exchanger, more than the amount of water by-pass back to the boiler room for heat exchange Station energy-saving operation. Condition conditions: high temperature water operation. Intelligent variable frequency electric control valve requirements: split-type three-way valve, thermal shock, noise reduction, rapid response.
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