Selection of oil pressure valves for fixed-bed gas generation
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In current gas generation processes, a seat valve is generally used at the top of the downward dust collector for the gas flowing downward; however, some suggest that a hydraulic gate valve should be installed before the dust collector. Which option is more suitable?
According to current views, the inlet and outlet valves should be as close as possible to the furnace body in order to reduce the dead space. Whether seat valves or gate valves are used for the downstream gas valve, it should be installed near the furnace body; in the case of a single furnace with a single waste pot, the downstream gas should be connected to the inlet of the waste pot. If the pipeline ahead of the downward gas dust collector is long, the downward valve should be moved forward; no additional valves are required. In the case of centralized recovery, each furnace should be equipped with a main gas valve to facilitate isolation of individual furnaces.
The downflow valve installed in front of the downflow gas dust collector should be placed as close as possible to the gas furnace body, inside the room near the ash bin, in order to reduce the dead zone in the downflow pipe. A gate valve should be used; a seat plate valve cannot be used as it creates high resistance.
The upstream and downstream valves are placed near the furnace body primarily to reduce waste from steam being blown in both directions. An overhead valve is usually installed for the upward flow, while if a seat-type valve is used for the downward flow, it is generally mounted on the downstream dust collector; this arrangement facilitates installation and reduces the need for elbows. If a gate valve is used for the downward flow, it should be placed as close as possible to the central tube. In cases where a seat-type valve is already installed on the downstream dust collector, there is no need to add another gate valve in front of it, as this would create additional points of failure and increase maintenance costs, which is not conducive to stable operation. The downward dust collector is generally not very far from the central pipe either (about 8 meters), and this is much better than those without a roof valve, where the upward valve is installed on the upper dust collector.
The third floor truly belongs to the technical team – their views are practical, and I agree with that. Just do whatever is convenient; there’s no need to strive for anything in particular.