Blockage in the drainage of the gasification scrubber tower

Is there a problem with dust removal earlier on? The large amount of dust carried along is causing issues with the water used for washing

What you’re saying is too general; I can only give you answers at a high level. 1. Measures to take later on involve enlarging the pipes or clearing them out, etc. 2. Measures to take in advance are to prevent blockages – as mentioned by someone else, things like dust might cause problems, so it’s necessary to install some kind of dust removal system beforehand

Increase the drainage volume of the scrubber tower and clean the pipelines during maintenance.

Blockage occurs only when the outflow is reduced; it rarely happens when the opening remains open.

The discharge pipeline for black water from the scrubber gets clogged, mainly during the initial stages of operation. If the circulation time of the black water is short when the plant is shut down, a large amount of dust accumulates in the scrubber. During maintenance, the bottom of the scrubber is not cleaned, and after feeding material in, due to low load and low furnace temperature, the coal slurry does not atomize properly and combustion is incomplete, resulting in a large amount of black ash being carried into the scrubber. As the furnace temperature rises, the temperature of the equipment and pipelines also increases, causing large amounts of scale to break off. After reaching 1.0 MPA, the black water is directed to the high-flash unit, and this is when the pipelines are prone to getting clogged； The solution is to increase the drainage volume after each stop; if there is enough time for maintenance, clean the bottom of the tower. Before starting up, open the drain valve at the bottom of the scrubber tower to check whether the pipeline in the first half is unobstructed. If it is blocked, close the shut-off valve on the black water pipeline of the scrubber tower and use the high-pressure boiler feed water from the gasification system to flush out the blockage at the bottom. If the blockage is in the latter part of the black water pipeline, close the angle valve and the upstream valve, then use the high-pressure boiler feed water from the sludge-water system to carry out a flush. There is also the issue of blocked pipelines during operation; this usually happens because of manual operation of the angle valves, and over time sediment builds up. As a result, the flow rate decreases, and if this isn’t noticed, the pipeline gets blocked. A bit messy;P

Indeed, all the blockages I’ve seen in wash towers occur at the beginning of operation, but they can be resolved through appropriate treatment.

I’ve gained new insights into design work recently – the conical-bottomed deflector plate has a significant impact. I’m not sure if there’s an issue with the height of your deflector plate; could you send me the drawings for that section?

Blockage of the black water discharge pipeline in the scrubber tower occurs mainly during the initial stage of operation; for example, when the system is shut down, the circulation time of the black water is short, which leads to significant accumulation of dust in the scrubber tower. During maintenance, the bottom of the scrubber tower is not cleaned, and after resuming operation, low load levels result in a large amount of black dust being carried into the scrubber tower. Large temperature fluctuations cause large amounts of scale to break off, leading to blockages. After 1.0 MPA, switch to dark water for high flash point; at this point the pipelines are prone to clogging ； The solution is to increase the drainage volume after each stop; if there is enough time for maintenance, clean the bottom of the tower. Before starting up, open the drain valve at the bottom of the scrubber tower to check whether the pipeline in the first half is unobstructed. If it is blocked, close the shut-off valve on the black water pipeline of the scrubber tower and use the high-pressure boiler feed water from the gasification system to flush out the blockage at the bottom. If the blockage is in the latter part of the black water pipeline, close the angle valve and the upstream valve, then use the high-pressure boiler feed water from the sludge-water system to carry out a flush.

Where is the high-pressure graywater from the slag water system connected, and is the backwashing effect good?