The resistance of the primary cooler is increasing rapidly
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In our plant, the primary coolers operate in a 2-on-1 configuration, and there have been frequent switchovers recently. Two or three days after washing, the resistance rises to over 1300 ； And there’s more tar residue ； The resistance before the fan after the initial cooling also reaches 1000 Pa… I’ve identified a few possible reasons; I hope everyone has different opinions and we can discuss them together. 1. The use of high-pressure ammonia water for coal charging results in a large amount of dust being carried in the gas, which causes blockages in the primary cooler. 2. The temperature of the primary cooler is kept low (our supervisor requires it to be below 21 degrees), leading to severe naphthalene formation. 3. We are currently removing the nozzles used for spraying liquid on the upper and lower sections of the condenser; so far, no blockages have been detected. 4. The spraying pressure of ammonia water in the rising pipe is sufficient, so there should be no problems. These are the reasons I can identify for now. Do anyone else have any suggestions? Let’s discuss it together. Moreover, why does this short section of pipe right before the fan have a resistance of 1000 after initial cooling (>﹏
Which pressure difference, before and after? Primary cooling? The resistance is around 1300.
Are there manholes for maintenance inspection along the pipeline from the cooler to the fan?
No, this pipeline is only about 50 meters long and has just one liquid drainage trap. It is currently being purged with steam. The effect is not very good……
Has the accumulation of naphthalene in the water seal become severe? It seems the water seal also doesn’t have an access port
There’s no need to rush; soon the density of tar ammonia solution will become similar, and the tar ammonia solution will no longer allow for separation between oil and water. As a result, the yield from the combined extraction of tar and other components will decrease. Please check if this is indeed the case – it has nothing to do with the processes involved in chemical product recovery.
This has happened to us before; if it’s a common issue, it might be due to too high a temperature in the furnace top area or insufficient coal being loaded. Find the cause earlier on, and it should be possible to resolve it.
Your analysis is not thorough enough. In the current coal gas pre-cooling processes used in coking operations across the country, the same problem exists: naphthalene forms on the shell side, and the negative-pressure pipelines for the coal gas gradually become clogged with naphthalene and narrow down This ultimately leads to frequent switching of the primary cooler, using methods such as steam cleaning, hot ammonia washing, or melting with hot gas. No matter which method is used, it only treats the symptoms, not the root cause! As a result, these all pose many drawbacks to the safe operation of fans, the normal production of coke ovens, and the thorough purification of gas produced after the machines. The problems you encounter in the gas primary cooling process are ones we have also faced over the course of several decades of production; we too went through many detours before eventually overcoming them. With our current primary cooling process, naphthalene does not accumulate over time, and there is no deposition of naphthalene or tar in the negative pressure pipeline behind the equipment. The primary cooling process operates efficiently over the long term, at low temperatures and with low energy consumption, thereby laying a solid foundation for maintaining stable pressure in the coke oven gas collection system, ensuring efficient gas transfer by the fans, and enabling further advanced purification of the gas. If you don’t believe it, you can come and take a look••••••