What is the feasibility of using exhaust gas as backflow air in the melamine process?
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I found in an article that exhaust gas is used as the backflow air for heat filter purification – is this approach feasible? What are the specific requirements? Let’s discuss this together
It’s indeed difficult to maintain the pressure; the exhaust pressure should be lower than that of the hot air, otherwise it won’t blow
Reply 1# scmydeng: Don’t be too obsessed with patents; most of them are based on assumptions! Reverse blow for exhaust gas? The idea is good, but the valves will corrode, and there are also crystal formation issues. What boosting method should be used? Moreover, exhaust gas emission is an effective way to remove inert gases and impure gases from the system, so the amount of exhaust gas is very small.
The exhaust gas contains various impurities such as liquid urine; it is not merely a gas, and these impurities can clog the pressure measurement points.
Reply to 6# menglin2157: Which manufacturers are currently using carrier gas backflow, and what is the backflow pressure? Is it the gas coming from the carrier gas compressor? Is voltage boosting needed?
I think it’s difficult to ensure the necessary pressure. From the perspective of intermittent backwashing, it’s hard to find equipment that can generate sufficient pressure; it seems that centrifugal pumps are the only option, but their pressure levels generally don’t meet the requirements. The equipment that does meet these requirements is too expensive, while continuous operation consumes too much electricity, whereas intermittent start-stop cycles put too much strain on the machine. Also, if you don’t apply pressure, it will be difficult to ensure an effective backflow effect.
This method should be difficult to implement; it’s hard to ensure the right level of pressure, and either too high or too low pressure can have a negative impact on the filter screen
Let’s discuss using carbon dioxide as the backwash gas; the temperature and pressure conditions are suitable, but I’m not sure if it will have any impact on the process.