Lockout valve
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Why are quick-close/quick-open valves used for lock-holding punching valves instead of PV-regulated valves? Rapid closing and opening can cause excessive pressure fluctuations in the system
During hopper stamping, it is isolated from the gasification furnace, so there are no fluctuations. The hopper is equipped with programming; it automatically shuts down when the pressure reaches a certain level
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Let me give an example: the operating pressure of the gasification furnace is 65 MPa. Under normal conditions, the lockhopper is connected to the gasification furnace, meaning the pressure is 6.5 MPa. When the lockhopper is in operation, it first gets disconnected from the gasification furnace, after which the appropriate procedures are followed. The pressure in the lockhopper is released into the lockhopper flushing water tank, and this process needs to be fast, not exceeding a set time – I believe it’s around 30 seconds. Only after pressure release can slag removal take place. If pressure control valves are used, the pressure release time will definitely increase, resulting in more slag accumulating inside the gasification furnace. This can affect water quality to a lesser extent, but in more severe cases, it can cause significant amounts of water and ash to end up in the raw gas, even leading to serious clogging of the outlets. Therefore, on-off valves should be used, and the faster the switching time, the better!