【Weekly Topic】Regarding the vibration of the slag lock hopper
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In fluidized bed gasification technology, whether it is water-coal slurry or dry coal powder, there is a slag discharge hopper at the bottom of the gasifier. The slag discharge hopper system operates automatically under the control of a PLC logic program, and it goes through five cyclic steps: slag collection, pressure relief, slag discharge, flushing, and pressure charging. During the lock-hopper cycling process, vibration and loud noises in the lock hopper generally occur. Let’s share our thoughts on the reasons for the vibration in the lock cylinder and what solutions are available. As usual, there are rewards for replies!
You know what that feeling is once you experience it up close; I thought an earthquake had occurred
Add expansion joints and spring supports to reduce pipeline vibration. At the same time, extending the operating time of the lower valve can help alleviate the situation
The lockbox support has been replaced with a spring support, and it is held in place at the top by spring rods; as a result, the vibrations are minimal, though some noise is inevitable.
This post was last edited by pyp222 on 2017-8-18 at 21:35. I have some insights I’d like to share with everyone. During slag discharge from a certain project’s lock hopper, when the lower slag closing mechanism was activated, there was significant vibration at the check valve of flush valve 13, along with considerable noise. Later, the maximum liquid level in the flush water tank was adjusted to ensure that it reached the minimum level required for flushing (so that the liquid level in the tank dropped below 10% during the process of opening and closing the lower slag closing mechanism). After this adjustment, almost no more vibration could be heard at that check valve, and the result was very good. Each device has its own characteristics; what works for my project may not work for other devices. But you can give it a try – there might be some pleasant surprises
It’s a good approach, but there are too many spelling mistakes.....
The lockbox support uses spring supports as the main element, with expansion joints serving as supplementary support; it seems that there isn’t much vibration
Control is achieved by reducing or eliminating the vibration source and minimizing the transmission of vibrations. Support and reinforcement serve to reduce transmission; essentially, they do not weaken or eliminate the vibration source
Eliminate vibration sources and extend the operating time of the lower valve
The vibration in the lock hopper is likely due, in part, to sudden changes in pressure within it. I haven’t been on site very often, so I don’t have much experience; I think controlling the rate of pressure change could help reduce this issue. For example, by slowing down the operation of the valves or improving the interlocking mechanisms related to valve pressure
Generally, the lock hopper vibrates in two situations: one is when the pressure in the lock hopper is released, and the other is during slag discharge