【Q&A Question 210】2018.08.04

Handling: ① Pump failure – switch to the backup pump to maintain production； ②Water supply interrupted; contact quickly for water supply ； ③If water supply is interrupted for a long time, reduce the feed rate or stop feeding ； ④During short-term water outages, the reaction temperature is appropriately increased by releasing waste hydrogen to maintain conversion rate and production. Generally, the stop time for water injection should not exceed 4 hours. After resuming water injection, the maximum injection volume should be maintained for a period of time. A device that allows for sequential branch-wise injection can be used to flush each branch for 10 minutes.

#Quick reply here: #1. The pump failed; switch to the backup pump to maintain production； 2. Water supply interrupted; contact promptly for water supply ； 3. If water supply is interrupted for an extended period, reduce the feed rate or stop feeding altogether ； 4. During short-term water interruptions, increase the reaction temperature appropriately to maintain conversion rate and production ； Generally, the time during which water injection is stopped should not exceed 4 hours; once water injection is resumed again

1) If the pump for injecting water stops operating, immediately close the outlet valve of that pump to prevent high pressure from leaking into the low-pressure system； 2) and immediately start the backup pump ； 3) Control the high-score threshold well ； 4) In the event of a water supply interruption, contact the upstream facility to supply water promptly ； 5) If there is a long-term water outage, reduce the feed rate or stop feeding.

When the reaction injection water is interrupted, the ammonium salts cannot be dissolved and carried away by water; over time, this can lead to severe scaling, causing a significant increase in the pressure difference between the hot and cold streams. This in turn affects the system’s pressure differences and increases the load on the recycle hydrogen compressor. Once the injection of water is interrupted, efforts should be made immediately to restore normal operation. If restoration is not possible after about 1 hour, the operation should be halted by reducing the flow rate.

Handling: ① Pump failure – switch to the backup pump to maintain production； ②Water supply interrupted; contact quickly for water supply ； ③If water supply is interrupted for a long time, reduce the feed rate or stop feeding ； ④During short-term water outages, the reaction temperature is appropriately increased by releasing waste hydrogen to maintain conversion rate and production. Generally, the stop time for water injection should not exceed 4 hours. After resuming water injection, the maximum injection volume should be maintained for a period of time. A device that allows for sequential branch-wise injection can be used to flush each branch for 10 minutes.

After the interruption of the reactive injection water, the following situations occurred: ① The inlet and outlet temperatures of the high-pressure air cooler increased； ②The water injection flow rate indicates zero ； ③The concentrations of NH3 and H2S in the recycled hydrogen increase ； ④The reaction temperature drops ； ⑤Prolonged cessation of water supply can cause the air-cooled ammonium salts to precipitate and become clogged, resulting in an increase in system pressure drop. Handling: ① Pump failure – switch to the backup pump to maintain production ； ②Water supply interrupted; contact quickly for water supply ； ③If water supply is interrupted for a long time, reduce the feed rate or stop feeding ； ④During short-term water outages, the reaction temperature is appropriately increased by releasing waste hydrogen to maintain conversion rate and production. Generally, the stop time for water injection should not exceed 4 hours. After resuming water injection, the maximum injection volume should be maintained for a period of time. A device that allows for sequential branch-wise injection can be used to flush each branch for 10 minutes.

1) If the pump for injecting water stops operating, immediately close the outlet valve of that pump to prevent high pressure from leaking into the low-pressure system； 2) and immediately start the backup pump ； 3) Control the high-score threshold well ； 4) In the event of a water supply interruption, contact the upstream facility to supply water promptly ； 5) If water supply is interrupted for an extended period, reduce the feed rate or stop feeding

1) If the pump for injecting water stops operating, immediately close the outlet valve of that pump to prevent high pressure from leaking into the low-pressure system； 2) and immediately start the backup pump ； 3) Control the high-score threshold well ； 4) In the event of a water supply interruption, contact the upstream facility to supply water promptly ； 5) If there is a long-term water outage, reduce the feed rate or stop feeding.

1) If the pump for injecting water stops operating, immediately close the outlet valve of that pump to prevent high pressure from leaking into the low-pressure system； 2) and immediately start the backup pump ； 3) Control the high-score threshold well ； 4) In the event of a water supply interruption, contact the upstream facility to supply water promptly ； 5) If there is a long-term water outage, reduce the feed rate or stop feeding.

1) If the pump for injecting water stops operating, immediately close the outlet valve of that pump to prevent high pressure from leaking into the low-pressure system； 2) and immediately start the backup pump ； 3) Control the high-score threshold well ； 4) In the event of a water supply interruption, contact the upstream facility to supply water promptly ； 5) If there is a long-term water outage, reduce the feed rate or stop feeding.