In the Shell process, there is insufficient quenching air volume, resulting in high temperature of 13TI0019
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Our factory is equipped with Shell gasification process with an annual output of 500,000 tons of synthetic ammonia! After the load of our gasifier reached 90%, there was insufficient quenching air volume, causing 13TI0019 to overheat. The power of our factory's K1301 quench air compressor is 1250KW , the air pumping volume is 45KG/S (kilograms/second). Another problem is that the quenching air volume will gradually decrease during operation, from the initial 44.9KG/S to today's 41KG/S. The quenching air volume was originally not enough, and as a result, this situation still occurs. The post-quenching gas temperature after leaving the gasifier and the temperature of 13TI0019 are even worse! ! Depressed, the analysis may be that the filter at the inlet of K1301 is clogged. Our factory once stopped the car due to the clogged filter of K1301. I would like to ask all friends, do you have insufficient quenching air volume, and whether the problem I mentioned occurs.: The amount of chilled air will gradually decrease during normal operation! !
1. There should be no doubt that the design margin is too small. 2. Under the current situation, you can consider gradually reducing the set point of 13T0020 to its shutdown operation. As long as the KM1301 current can withstand it, it can also reduce the blockage of STR0006. For reference only.
The designed air volume of the compressor is a bit small, but it has no direct relationship with the gradual reduction of your quench air volume. You judge that it is caused by filter blockage. Is the pressure difference increasing, and is the gasification pressure stable? Is PV0076 closing slowly? First add some nitrogen to the quench line to observe, and then handle it if you judge it correctly.
It has never happened before, but if this happens, first check the process flow.
This post was last edited by shanxg on 2009-10-25 09:41. I was depressed. The day before yesterday, the gasification trip occurred because of the misoperation of the 16TI0010 temperature point. The change in the temperature trend at this point could not be found on the DCS trend. Finally, it was found on the ESD trend that it was due to the misoperation of the interlock interlock tripping due to the misoperation of the changed temperature point! ! But it started driving again 7 hours after jumping out of the car! ! !
The filter pressure difference has increased, and the gasifier system pressure is relatively stable. At 92% load, the gasifier pressure is 3.83MPA. In addition, we are forcing the nitrogen valve on the quench gas pipeline to be in a normally open state. Even under such operating conditions, it still shows that the quench gas volume is not enough! !
As mentioned above, there should be nothing wrong with the design. Is there a blockage in the pipe? ? ? If the flow rate gradually decreases, it should be because the filter is clogged or the pipe is clogged. You can ask the instrument to check the differential pressure gauge.
It is also possible that dust accumulation on the K1301 impeller causes the flow channel to narrow.
A similar situation has occurred here, mainly due to partial blockage of the pressure balance hole.
Generally this does not happen. If it does, it means there is a problem with your compressor. Replacing a compressor should solve the problem