Application of triple eccentric butterfly valve in petrochemical plant
On large-diameter pipelines, the cost of using a shut-off valve is very high and zero leakage cannot be achieved. In the case of emergency shutdown, a shut-off valve must be installed beside the shut-off valve. Although the V-shaped ball valve can also achieve cut-off (zero leakage) and regulation, the cost is also much higher than that of the triple eccentric butterfly valve.
At present, butterfly valves above DN300 mm have gradually replaced gate valves. Compared with gate valves, butterfly valves have the characteristics of short opening and closing time, small operating torque, small installation space and light weight. Taking DN1 000mm as an example, the butterfly valve is about 2t and the gate valve is about 35t, and the butterfly valve is easy to combine with various driving devices, and has good durability and reliability. Because triple eccentric butterfly valve has significant advantages compared with globe valve, ball valve and gate valve, triple eccentric butterfly valve has been successfully applied in many occasions in petrochemical industry.
- The triple eccentric butterfly valve integrates adjustment and shut-off (to achieve zero leakage), and has a successful typical application in polyethylene equipment. The reactor cooling water temperature regulation loop of the polyethylene plant is the most important part of the plant. Whether the temperature regulation loop can run smoothly directly determines whether the entire polyethylene plant can run safely and smoothly. The temperature-adjusting water pipeline is of large diameter (above DN450 mm). Under normal working conditions, the triple-eccentric butterfly valve is used as a control valve because of its high control ratio, which is more stable and reliable than ordinary control valves. Butterfly valves can also act as a shut-off and are completely shut-off (zero leakage). From the actual application situation, not only the investment cost is saved, but also the control is particularly stable.
- The coke cleaning valve at the outlet of the cracking furnace of the ethylene plant is a kind of valve with harsh operating conditions in the petrochemical industry. Carbon particles in the process medium may accumulate on the sealing surface of the valve, causing the sealing surface to bite, so that the valve cannot be opened normally, or even shortened. service life of the valve. Compared with other types of valves, triple eccentric butterfly valve is the most ideal choice due to its unique structural characteristics.
- The cutting and adjustment of the inlet pipeline of the flue gas turbine of the catalytic cracking unit of each refinery, due to the large diameter of the process pipeline and the high temperature flue gas (up to 750℃) as the process medium, the valves used are mainly triple eccentric butterfly valves, and the valve size of the domestic device is the largest It has reached DN1 800mm, equipped with hydraulic actuator and the closing time is less than 05 s; others such as the main fan inlet and outlet pipes and vent valves, air compressor inlet and outlet pipes, torch venting valves, oil slurry pump inlet and outlet, various high, medium and low pressure steam pipelines A large number of triple-eccentric butterfly valves are also used for adjustment and cut-off. Liquefied petroleum gas is very easy to leak. To meet the large flow capacity and avoid leakage, it is more reliable to use a triple eccentric butterfly valve on the main line of the tank inlet and outlet. In addition, in the sulfur recovery unit, the liquid sulfur that needs to be transported in a molten state is currently a triple-eccentric butterfly valve with a steam jacket.
As the crystallization of the latest valve technology, the triple eccentric butterfly valve has various valve advantages and avoids various valve disadvantages. It has been valued by the majority of users and designers and has been widely used.
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