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Discuss the application of the butterfly valve in chlor-alkali enterprises were
Discuss the application of the butterfly valve in chlor-alkali enterprises were
A factory in the industrial water, salt water, recycling brine, electrolyte, lye, hydrogen, sulfuric acid, chlorine, chlorine water system has been using cut-off valve, gate valve, diaphragm valve as process control valve. With the scale enlargement of the production, process control level unceasing enhancement, a factory for process control valve of the demand is higher and higher, in the above systems use years of cut-off valve, gate valve, diaphragm valve, because of its structure and material defects directly affect the safety and reliability, economic rationality, manipulability, etc., thus more and more can not adapt to the needs of the modern production. Such as: cut-off valve, gate valve existing valve core easy to fall off of the defects, The diaphragm valve diaphragm easy damage; Cut-off valve, gate valve stem place generally adopts packing seal, packing and vertical movement up and down the stem directly friction, such as valve often switch, the packing easy to wear, not only cause material leakage and pollution of the environment; Cut-off valve, gate valve actuator exposed, if the valve is not often switch or maintain undeserved, stem and drive the gaps between the nut is easy for rust or dust accumulation of foreign body caused by the valve opening and closing difficult, etc. To thoroughly solve the above problems, a factory technical personnel in each material to the characteristics of the system gradually choosing different seal deputy butterfly valve replace the original use of cut-off valve, gate valve, diaphragm valve, and has obtained the certain effect.
1 the advantages of butterfly valve
Butterfly valve and the cut-off valve, gate valve, diaphragm valve compared with has the following advantages: (1) structure is reasonable and easy to change, the same diameter conditions, the volume is smaller, lighter; (2) the valve opening and closing through the control handle or worm gear and worm gear drive valve rod, to make disc from 90 ° rotation movement, the valve is in the open or closed then; Not only the valve opening and closing rapidly, and control is simple, energy; (3) have larger channel flow section rate and good circulation characteristics; (4) the valve can be installed in any position to use, and are not affected by the flow direction of medium limit; (5) the rotation control handle or handwheel position, can adjust line medium flow, and have good cutting and regulating performance; (6) and the cut-off valve, gate valve, diaphragm valve, each valve compared with static seal point reduce two, effectively reduce the probability of valve leakage; (7) through the bolt seat fully adjustable, can be in field adjustable seat or replace seat and valve seat inside parts, do not need special tools, also don't have to remove the valve, convenient for daily maintenance; (8) drive closed in seat internal, completely avoid the outside corrosive gas and water erosion, without special maintenance, reduce the labor intensity of the operators.
2 use condition and effect evaluation
2.1 circulating water system
The original use of gate valve, due to the valve is not often switch and open put, stem and transmission between the nut to crack for rust or dust accumulation of foreign body caused by the valve opening and closing is difficult, especially Φ 300, Φ 400 specifications more ram valve sometimes need 2 ~ 3 people fit to switch valve. In addition, the valve size, quality is bigger, replacement valve for hoisting machinery fit. Instead of butyl rubber eye a ball iron seal deputy butterfly valve, not only the valve control, adjust easily, only one person can complete, and change the valve can not hoisting machinery fit.
2.2 brine, recycling brine, electrolyte system
The original use Φ 100 ~ 250 specifications of the gate valve. Because the system material itself has strong corrosive, strong permeability, the valve packing place easy leakage, and salt, even strengthen the daily inspection, maintenance, still cannot fundamentally solved. In addition the valve manufacturers usually use carbon steel material production valve core card, the valve core card easy to material corrosion, resulting in the valve core fall off. A factory refined salt water pump, mixed salt water pump, electrolytic liquid preheater and equipment import and export valve by valve core off times caused by system local short time parking replacement valves, safety in production to bring the unstable factors. After technical personnel according to system material corrosion characteristics, use of butyl rubber eye a ball iron seal deputy butterfly valves replace gate valve, and gradually promotion, eliminate the valve core is easy to fall off the unstable factors, leakage problem also solved.
2.3 chlorine gas compressor outlet valve
A factory original use cut-off valve, although sealing effect is good, but due to the structural constraint valve opening and closing time is long. There was a chloride press switch outlet valve for timely switch, chlorine break through water, causing a chlorine gas leakage. After the valve to the F4 a stainless steel sealing pair of butterfly valve, after several years of use, control personnel very highly. Agree that the valve switch easily, quickly, eliminate the chloride press switch valve switch for export in May cause of chlorine leakage incident.
2.4 lye conveying system
A factory to the company internal manufacturer delivery lye, first by Yang fluid machine measurement, and then the compressed air through the pipe the lye delivery in the past. Yang liquid device import and export valve original the cut-off valve. Since the 0.3 ~ 0.5 MPa compressed air delivery, delivery process cut-off valve packing place often leakage finished lye. On the one hand cause finished alkali loss, on the other hand also environmental pollution. Therefore, will lift fluid apparatus import and export valve to acrylonitrile butadiene a ball iron seal deputy butterfly valve, lye leakage problem has been completely resolved.
2.5 chlorine water system, sulfuric acid system, hydrogen system
Chlorine water system by the Φ 200 specifications of the polypropylene diaphragm valve. The valves are the shortcomings of diaphragm easily damaged, and huge volume. Will it into a butterfly. Considering the chlorine drying position of chlorine water environment and strong corrosive, choose F46 a reinforced polypropylene seal of butterfly valve material, the use of so far in good condition; Sulfuric acid pump import and export the original stainless steel core cast steel globe valve. But due to valve size, quality, control and replaced in large labor intensity. Then tried a F4 a stainless steel sealing pair of butterfly valve, by the use of good effect; Hydrogen pump import and export valve and back to the original valve are used by broad, post operation personnel reflect the original valve control and time-consuming, especially meet special event, the original valve for opening and closing speed slow and can't meet the production control, therefore affect technical personnel will import and export valve gradually to a butadiene-acrylonitrile rubber ball iron seal deputy butterfly valve, in order to meet the needs of the production control, get operator's high praise.
Three benefits
A factory in the industrial water, salt water, recycling brine, electrolyte, lye, hydrogen, sulfuric acid, chloride water system to switch to a different capable person is qualitative, not
