The temperature and pressure reduction system key equipment, before and after the valve pressure difference is large, prone to leakage, noise and cavitation, automatic control will fail. In this paper, based on the operation data, process analysis of the system requirements on the control valve. And through the process parameter analysis, analysis of the calculation to determine the selection of products manufacturers. Finally, from the system before and after the transformation of our factory on the theoretical analysis to confirm the.
Technology conditions of process conditions and the transformation of the former
In the production process of my own steam, is a key equipment for temperature and pressure reduction device, the device will steam boiler production (not through a turbine case) from the 2.48MPA430OC temperature and pressure reduction to 0.35MPA170OC, to meet the needs of other steam unit; the reduction temperature on the pressure reducer valve and desuperheating water distribution valve for the temperature and pressure reducer factory facilities, model for the Y45Y100-DGL50 two-seat valve and JF61H-100DN32 for water distribution valve; since the company since the production equipment, continuous operation for more than 4 years, basically can meet the production requirements; but in the 4 year of operation period, we also found that there are some problems with the device, mainly manifested in the following aspects:
(1) the leakage of pressure reducing valve, especially in the steam passes through the turbine case, in this kind of condition, the valve should be completely closed, but because the two-seat valve structure itself and the quality of the products and other issues, the valve is still larger steam leakage in the fully closed position the energy, causing unnecessary loss, and increase the cost of production. In this paper.
(2) small regulating range: from the two-seat valve regulating characteristic that, adjusting range of the valve is relatively small; according to the actual operation process, boiler in low load operation (steam capacity at 10T/H), the valve can not complete the adjustment of the steam pressure, the steam flow is less than 1OT/H, unable to regulate the steam pressure.
(3) the low control precision, stability is poor: control valve and temperature reducing valve is used with servo amplifier angle stroke electric actuator, actuator and valve stem connected with the lever; servo amplifier models are too old, adjust the balance and stability of the complex, possibly due to electronic component and device for servo the amplifier and the feedback on the board without industrialization process, the environmental requirements are also higher, at high temperature and dust environment is not stable; coupling design of actuator and valve body is not reasonable, lever connection multi-pivot type although meet will enlarge the angle travel electric actuator output force, but the lever of the the nodes exists mechanical gap, unable to meet the requirements of control precision and control stability of the whole control system. So the control precision and stability of the two sets of valves are both poor, unable to meet the requirements of automatic production, since the drive has been in manual and operating conditions, low control accuracy.
(4) the daily repair capacity, operation difficulty: because the equipment of the control system has some defects in the selection, so there are always some problems in practical operation, are 2-3 times weekly repair, since and technology since the start of production is not automatically cast, increases the process operators operation difficulty.
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