【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 080

High-pressure string to low-pressure string; the cyclic hydrogen desulfurization tower is connected to the rich liquid tank. Series connection at the outlet of the hydrogen feed pump inlet. Series connection at the outlet of the high-pressure injection pump inlet. New hydrogen machine outlet series inlet

①Only then does the pressure from the high-pressure separator flow into the low-pressure separator； ②New hydrogen compressor outlet bypass inlet ； ③Backflow into the inlet at the outlet of the reaction feed pump ； ④High-pressure injection pump outlet to inlet ； ⑤Circulating hydrogen desulfurization tower rich liquid flash tank ； ⑥Leak from the outlet to the inlet of the high-pressure lean amine liquid pump.

High-pressure separator in series with low-pressure separator； New hydrogen compressor outlet string

(1) The oil phase between the high-grade and low-grade streams, as well as the acidic water from both grades, is sent to the acidic water tank; the level of the high-grade liquid must be maintained at a certain height to prevent the gas phase from entering the low-grade stream； During shutdown, the high-level cut-off should not be left empty to prevent gas phase from entering the acidic water tank; during startup, the cut-off control valve manual valve can be opened only after establishing the high-level cut-off. (2) For the cross-line between the separator tank at the circulating hydrogen inlet and the separator tank at the new hydrogen compressor inlet, care should be taken during startup, shutdown, and operation to prevent sudden failures of the new hydrogen compressor, which could lead to high pressure leaking into the low-pressure system. During normal operation, all the cross-line valves at the top of the separator tank at the circulating hydrogen inlet should be closed, while the inlet valve of the separator tank at the new hydrogen compressor inlet should be kept fully open. (3) When the reaction feed pump, the fresh hydrogen compressor, and the water injection pump stop operating due to a fault, their outlet valves should be closed promptly to prevent high-pressure hydrogen from flowing back into the low-pressure system due to a faulty check valve. Additionally, attention should be paid to closing the two-way and manual valves of the fresh hydrogen compressor in a timely manner. (4) From the low-pressure tank to the distillation system, to prevent gas phase from entering the distillation system due to an excessively low level of liquid in the low-pressure tank.

1. High-pressure separator in series with low-pressure separator； 2. Outlet-to-inlet connection of the new hydrogen compressor ； 3. High-pressure injection pump outlet to inlet connection ； 4. Inlet connected in series at the outlet of the reaction feed pump ； 5. Desulfurization tower for circulating hydrogen compressor

(1) The oil phase between high and low scores, as well as the acidic water from high and low scores to the acidic water tank； (2) Interconnection between the circulating hydrogen inlet demister tank and the fresh hydrogen compressor inlet demister tank ； (3) When the reaction feed pump, fresh hydrogen compressor, and feed water pump fail and shut down ； (4) From the low-pressure tank to the distillation system.

①Only then does the pressure from the high-pressure separator flow into the low-pressure separator； ②New hydrogen compressor outlet bypass inlet ； ③Backflow into the inlet at the outlet of the reaction feed pump ； ④High-pressure injection pump outlet to inlet ； ⑤Circulating hydrogen desulfurization tower rich liquid flash tank ； ⑥Leak from the outlet to the inlet of the high-pressure lean amine liquid pump.