Can we remove the S3 filter at the bottom of the thermal regeneration tower?
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As is well known, in a low-temperature methanol washing system, an S3 filter is installed at the outlet of the left chamber at the bottom of the regeneration tower. Its purpose is to filter the methanol flowing from this chamber into the lean methanol tank, thereby preventing impurities and corrosive substances from clogging the E10 heat exchanger. It also avoids the problems caused by frequent blockages of the filter screen at the inlet of the lean methanol pump, which could lead to pump failure Recently, I’ve seen that some manufacturers’ design drawings do not include this filter! Please discuss whether it is feasible! !
We don’t have one; the process might be different from yours. There’s no tank for poor methanol at the bottom of the tower either – instead, the mixture is sent directly via a pump to the methanol-water separation tower for water separation. It’s the Lurgi process.
Are your S1 and S3 the same size? Don’t these two filters need to be cleaned during normal production? And if cleaning is needed, how is it done? Is E10 a coiled heat exchanger? What is the capacity of the P5 pump?
It’s certainly possible to remove it, but it causes a lot of trouble – for example, the pump filters tend to get clogged, which leads to frequent need to reverse the pump’s operation and reduces its lifespan... I’ve also seen processes that don’t use filters; in those cases, they have to clean the filters of the cold-zone pumps regularly... I think it’s more convenient to use filters
Early methanol washing units basically did not have this filter; it was added later, and now filters are included in designs in China. However, this filter rarely gets clogged under normal conditions; it is only prone to clogging when the liquid level in the regeneration tower fluctuates significantly. So the impact on the lean methanol pump is not significant. We also added this filter later on; it hasn’t been used for over two years now. So I think it’s optional.
It should have a theory; that way, the absorption effect is better, otherwise the pressure difference increases. Impact effect.
Early methanol washing systems basically did not have this filter; it was added later. Nowadays, domestic designs include such filters, so it’s best not to remove them. If removed, there is no major problem, but it will increase energy consumption and similar issues~~~
You asked, \"Are your S1 and S3 the same size?\" Don’t these two filters need to be cleaned during normal production? And if cleaning is needed, how is it done? Is E10 a coiled heat exchanger? What is the capacity of the P5 pump? ” 1. Our S1 and S3 designs are not the same size. The filtration precision of S1 is 2.5 um, while that of S3 is 250 um. S3 has not been cleaned except once after the initial startup and water circulation process was completed; S1, on the other hand, needs to be cleaned frequently – at most twice a day in the dirtiest conditions. After modifications were made (involving the use of high-temperature condensate to flush the filter), it now needs to be cleaned once every one to two days! 2. Our E10 is a coiled heat exchanger, and the S3 mechanism was designed to prevent debris from entering the E10 and causing blockages. However, the filtering precision of S3 is so low that it fails to provide any actual filtering effect! So I think there are issues with the precision selection of the several filter elements designed in the system, and improvements are needed! 3. The actual capacity of the P5 pump is 135 m3/h; if it operates at the designed flow rate, the cleaning frequency for S1 would be even higher. Currently, we keep its flow rate around 40 m3/h! This post was last edited by yichaoshan2005 on 2009-4-18 16:39.]
This is based on domestic operational experience and practices; the technology provider does not offer such a setting. It doesn’t do much when you first start driving.
I wonder what use it is when driving? When the vehicle was first driven, the system was clean, and a large portion of the solid impurities in the methanol in the system were corrosion products. This isn’t a temporary filter.
During operation, the filters located between Tower 4’s left ventricle and E10 were cleaned quite frequently. A 100-mesh filter was used; this wasn’t part of the original design – it was added later as a requirement. This approach helps to reduce the frequency of cleaning the pre-filter before the lean methanol pump, as well as the number of times the pump itself needs to be cleaned. During operation, the two filters at the outlet at the bottom of Tower 4, S1/S3, were also cleaned frequently, especially S1
In my opinion, the capacity of your P5 pumps is designed to be too high, and their operating costs are high. Another question is, wasn’t the methanol filtered when you were cleaning S1? If there is no filtration, won’t the coiled heat exchanger get clogged over time?
Indeed, I also feel that the design capacity of our P5 pumps is on the high side, which leads to increased energy consumption. Since there is only one S1 filter, its cost is high; during cleaning, a bypass route must be used. The issue you mentioned certainly exists as well, but the cleaning time is very short, so it will be ready for use again in no time!