350 mw high pressure heater water level control system improvement program

Abstract: the 350 mw high pressure heater water level control system improvement program information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The first phase of huaneng nantong power plant 2 units of 350 mw high pressure heater ( High plus) Water level control system, have been put into production after putting-in-service proactively difficult, the problem of poor quality water level regulation, and the disturbance, the water level is difficult to control, has the high water level. More flow meter manufacturers choose model price quote you are welcome to inquire, here are 350 mw high pressure heater water level control system improvement program details. The first phase of huaneng nantong power plant 2 units of 350 mw high pressure heater ( High plus) Water level control system, have been put into production after putting-in-service proactively difficult, the problem of poor quality water level regulation, and the disturbance, the water level is difficult to control, has the high water level high protections to add columns. Therefore, it is necessary to control and protection systems of high water level was improved and perfected. One, the introduction of system unit 1 a total of 6, 7, 8, 3 high vertical U tube surface. According to the conventional extraction, water supply circuit design, 6, 7, 8 high plus is a feed water bypass. High normal drain for water step by step, each with 1 road critical drain through the condenser. Each high and each with 1 water level transmitter, one on the water level controller ( Air help) 1 and the water level switch. Water level transmitter is used for the water level of the control centre room in display and high/low water level alarm. In situ water level controller according to the normal high water level control trap and critical trap, the pneumatic controller output ( 20. From 67 to 103. 35) KPa control signals. In the control signal ( 20. From 67 to 62. 21) KPa control normal trap range is 0 ~ 100% opening, in ( 62. 21-103. 35) KPa control critical trap range is 0 ~ 100% opening. Under different working conditions, by controlling the normal and critical trap trap gas solenoid valve on the road, to realize these two valve control mode switch. Normal electromagnetic valve of the steam trap by electric water level regulation, accept the control signals of the water level controller; Losing electricity makes normal trap shut. Critical electromagnetic valve of the steam trap loss of electricity in the water level regulation, accept the control signals of the water level controller; The electricity makes critical trap shut. No. 7 high and the control logic of trap as shown in figure 1 ( 6, and 8 similar) 。 Water level switch is used to detect water level three value signal, water level of three values that delay 20 s, shut down the high extraction non-return valve and extraction shutoff valves; The water level of three high value at the same time delay 1 min, make add water to go high three big bypass, three high plus all columns. Second, there is a problem ( 1) Water level controller because the water level control system with only 1 on the normal water level controller control and critical trap, trap and control characteristics of the two trap. Normal steam trap for normal high water level adjustment, require action smoothly and high accuracy; And critical trap for high water protection function, demand response quickly, so a water level controller is difficult to meet the normal steam trap and the different requirements of critical trap, so water level control quality is not ideal, causing high difficulty and putting-in-service proactively, and water level controller can not stand the disturbance in the running, when disturbance is often high water level protection action, affect the stable and economic operation of the unit. （ 2) High electromagnetic valve installation position and its control logic and critical water valve solenoid valve installed on the water level controller output control signal trachea, normal running, the solenoid valve is electricity, to cut off the control signal, critical trap shut. In one of the following situations happened when the solenoid valve losing electricity: 1) The high water level of high value; 2) High water level of three high value at a lower level; 3) Normal steam trap shut. The water level controller control gas signal to the desperate trap locator, critical trap in a state of adjustment. However, when one of the above three kinds of circumstances, high operation is in an urgent condition, but the water level of the controller output signal pass locator conversion magnification makes critical drain valve is open. So water level tends to rise quickly, sometimes to level three values and cut off the high addition of steam, add water to go high even bypass. Once is particularly serious water level controller failure, high added to hydrophobic, will lead to more serious consequences. （ 3) Water level switch is not sensitive reaction, water level switch, the three value even if the actual water level back to normal is not immediately restore in situ, thus a high water level signal of protection by mistake. （ 4) High water level protection logic high water level three high value when cut off the high steam added to delay and add water by-passing the delay time is too long, if caused by high leakage and high water level is high, may delay protection have led to the turbine inlet. Three, improvement plan and improvement effect ( 1) Eliminated pneumatic controller to DCS to realize the high water level adjusting to normal trap and the critical water valve replaced by DCS control, design of separate water level regulator. According to the normal steam trap and crisis different dynamic characteristics of the steam trap, setting their own parameters adjustment. Normal given value of the water level of the drain water level controller for normal water level, adjust the quality stable and accurate.

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