What procedures should be followed to address this situation after shutting down a four-nozzle gasification furnace?
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When the system is shut down and pressure is released, as the pressure drops (to around 10 kilograms) and reaches the stage where the black water switches from high pressure to low pressure, if it is found that the pipelines leading to the vaporizer and the water scrubber tower, as well as those leading to vacuum (or other tanks or vessels), are not functional, what should be done in such a situation? At this point, the system pressure is still declining slowly. What can be done to prevent a flood?
Cut open the workpiece, and add a little less water
Switch to the preheating water circulation mode and stop the main circulation, then carry out inspection and clearance!
It can indeed solve the problem of rising liquid levels in the gasifier and wash tower. However, there is still some concern: at this point the system pressure might still be several kilograms; even if that pressure is gone, the gasification unit/wash tower still contains a large amount of syngas. Could this syngas leak into the slag tank as water flows back to it through the preheating seal tank, creating a safety hazard? Since this is basically similar to draining directly into the slag pool using a lock hopper, there is concern that the gas might come into contact with air.