Installation location of the hydrogen analyzer
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Hydrogen analyzers are generally installed on the outlet pipeline at the top of the quench tower; why cannot they be installed on the outlet pipeline of the hydrogenation reactor? It’s all after the reaction; I don’t quite understand. Please, experts, explain it to me. Thank you; extra points appreciated
Those that are not installed after the hydrogenation reactor result in high temperatures after the reactor, a high moisture content in the process gas, and harsh operating conditions; therefore, they are generally not placed here. Currently, there are two common types of pipelines for the hydrogen analyzer in designs: the process gas from the top of the quench tower and the purified exhaust gas from the top of the absorption tower. These two outlets generally exist simultaneously. The usage is as follows: the outlet at the top of the quench tower is used only during startup for the pre-sulfurization of the hydrogenation reactor and during cyclic temperature rise, in order to measure the hydrogen content in the recycle gas ； Once the device is operating normally, it should be switched as soon as possible to exhaust gas purification at the top of the absorption tower. The reason for this setting is as follows: Hydrogen sulfide in the process gas can interfere with the analysis performed by the hydrogen analyzer. The pre-treatment section of such analyzers typically includes facilities for removing hydrogen sulfide. However, the high concentration of hydrogen sulfide in the process gas at the top of the quench tower increases the frequency at which these hydrogen sulfide removal facilities need to be replaced. Therefore, during normal operation, it is necessary to switch to using the exhaust gas purified at the top of the absorption tower.
The function of an online hydrogen analyzer is to measure the hydrogen content in the exhaust gas exiting the quench tower; this content should generally be between 1% and 2% to ensure that the liquid sulfur in the exhaust gas treatment system is completely reduced to hydrogen sulfide, thereby preventing the liquid sulfur from solidifying as it cools down in the quench tower and causing blockages there.
The second floor is correct; it is related to the outlet temperature of the hydrogenation catalyst and the medium. Moreover, during operation, there is some catalyst dust at the outlet of the hydrogenation reactor, which can be quite harmful to the on-line instruments as well. The solid content in the gas at the top of the quench tower is practically zero
The second floor is correct; it is related to the outlet temperature of the hydrogenation catalyst and the medium. Moreover, during operation, there is some catalyst dust at the outlet of the hydrogenation reactor, which can be quite harmful to the on-line instruments as well. The solid content in the gas at the top of the quench tower is practically zero