Regarding the issues encountered during sampling from the side line of the hydrogen sulfide concentration tower in low-temperature methanol washing

The colleague, acting as a heat source for the tower (of course at a very low temperature), returned to the lower part of the tower. It can also be understood as the liquid from the “upper column” entering the “lower column” after being heated to continue with the stripping process. Ensure the gas is fully resolved.

It can also serve as a return flow function!

Heat can be recovered from this liquid stream to purify CO2

This pipeline is mainly used to supply cooling capacity to Tower C1~! There is also the effect of flash vaporized carbon dioxide; this stream can also reduce the load on the hot zone! It enables the recovery of cooling capacity; this line is also used for concentrating hydrogen sulfide

This line in the 3-tower system is primarily used to transfer the cooling capacity from the upper tower to the system, while simultaneously heating the rich methanol; it also facilitates the desorption of some CO2 from the rich methanol so that it can enter T2, thereby increasing the amount of CO2 produced in the system and concentrating hydrogen sulfide； When this methanol enters the lower column, nitrogen stripping causes more CO2 to be released, along with hydrogen sulfide, while additional cooling is obtained. 【I think the rich methanol that enters the lower tower is mainly due to desorption; both CO2 and H2S get desorbed. This methanol serves as feed material and does not play a role in reflux.] ； The upper tower is primarily used to desorb CO2 while absorbing H2S, in order to prevent the H2S level in the exhaust gases from exceeding permissible limits.】

Provides cooling capacity, generates more CO2, concentrates H2S, prevents cooling energy from flowing to the hot area, and reduces the load on that area!

Does the hydrogen sulfide concentration tower refer to a stripping tower (regeneration tower)? Everyone says it’s for cooling, but why do I think it’s for heating? This post was last edited by ghhan on 2009-3-6 12:37.]

The hydrogen sulfide concentration tower is that nitrogen stripping tower, namely Tower T3； The thermal regeneration tower is the tower in which methanol-rich fluid is regenerated using a reboiler, namely Tower T4.

This stream is the one with the lowest temperature in the entire system; after going through a small cycle during which it recovers the cold energy and is heated, it enters the bottom of the second tower, where it further recovers carbon dioxide while also serving to concentrate hydrogen sulfide

This methanol is the coldest methanol used in low-temperature methanol washing; it provides cooling capacity for E8 to cool the lean methanol used in the washing process, and it also supplies cooling power to E6 to cool the rich methanol obtained from the polishing section and main washing section of tower C1, whose temperature has increased due to CO2 absorption, thereby ensuring that the parameters of the purified gas at the top of the tower meet the required standards

This post was last edited by Long Dou Shi on 2012-6-13 21:09. Why is the condenser tower the source of cooling capacity for the entire process unit? Is it the exothermic reaction of nitrogen stripping that causes the temperature of the methanol solution to drop? Solve

It is the decomposition of CO2 that lowers the temperature of methanol.