What is the procedure to take after a synthesis cycle machine trips during normal production?

Is 1# wlq1970 a syngas compressor? If so, this is the simplest approach in the synthesis unit: immediately disconnect the synthesis circuit and maintain the insulation and pressure in the synthesis tower ； The chiller can be put back into circulation operation immediately

During normal operation, after the synthesis cycle machine trips, the inlet and outlet valves of the cycle machine should be quickly closed, and the circuit valve should be opened. Open the vent valve to relieve pressure and turn off the cooling water. At the same time, quickly start the backup circulation unit and contact the previous section to reduce the flow rate, while keeping the temperature of the synthesis tower at normal levels.

1. Immediately close the loop pump bypass valve and the system main bypass valve. 2. Start the standby machine for operation. Points to note: 1. Contact the relevant party in a timely manner to reduce the load, in order to prevent overpressure and overheating. 2. Reduce the flow or close the ammonia release valve and the cold exchange ammonia release valve to prevent gas from leaking into the ammonia tank. 3. Reduce the flow or close the water supply valve for the waste heat exchanger and the ammonia supply valve for the ammonia cooler, to prevent the waste heat exchanger and ammonia cooler from becoming filled with liquid.

Well, there’s no exact answer to this. It depends on the size of the system and the level of load. If there is only one circulation machine, then in case of a shutdown at stage six, synthesis will definitely have to be stopped. If two machines are available and one shuts down, it may not be necessary to reduce the output, depending on the conditions of the system; it takes about 8 minutes to start up a backup circulation machine. Of course, it’s important to get this balance right. There’s not much to say else; one needs extensive experience and the ability to adapt, rather than simply jumping out of the car and calling for a reduction in speed or stopping to solve the problem.

In the ammonia synthesis process, the circulation volume is the largest. In our plant, the circulation section of the compressor is not separate; if a fault occurs, the compressor is also shut down.

1# wlq1970: Generally, the main valve is closed and the make-up air vent is opened. Close the ammonia valve, close the inlet and outlet of the circulator, and open the shortcut. Start the circulation pump to vent. Promptly start the backup circulation pump. Then synthesize the intake air. This is a program designed for machines that can start the cycle immediately

Insulate and maintain pressure in the synthesis tower, set the minimum speed of the refrigeration cycle, close the pressure relief valve, adjust the operating conditions of the system beforehand, and handle the recovery unit.

After the circulation pump trips, close its inlet and outlet valves, open the bypass valve, and relieve pressure from the circulation pump. To prevent the system from overpressuring, shut off the fresh gas valve and open the vent valve to release pressure; control the pressure in the synthesis drum based on the temperature of the catalyst bed to avoid overheating. Coordinate with the previous process to reduce consumption, and quickly activate the backup circulation machine; if no backup circulation machine is available, take emergency shutdown measures.

Different factories have different processes, so it’s hard to tell. We are Kellogg Process; after a shutdown of the syngas compressor, in addition to the issues related to the refrigeration cycle affecting the synthesis circuit mentioned above, it is also necessary to pay attention to the steam balance.

At the end of last month, the synthetic turbine in our plant stopped working. It happened to be my shift; I was in the gas production building when I suddenly heard the hissing sound of the safety valve in the ammonia intermediate tank. I ran over to the synthesis area and found that it was due to a turbine trip, which caused air to leak from the ammonia ejector into the ammonia intermediate tank. Since our plant uses turbine compressors, the flow rate is high, which causes the system pressure to rise rapidly. The ammonia cut-off valve is activated, and the plant is shut down immediately (the compressors in the previous section operate in bypass mode), while an exhaust valve is opened to release pressure. (There is also one turbine compressor and two reciprocating compressors available as backups.) Turbo compressors have a large flow rate and require a shielding gas to maintain pressure, while reciprocating compressors also need time to start up; therefore, for safety reasons, the gas supply is cut off first. In fact, it only takes 5 minutes of calming down to get ready to drive.