Two ammonia chillers are connected in parallel and used simultaneously, but the ammonia storage tanks always end up one being full while the other is empty. How can this problem be solved?
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This unit uses two ammonia compressors and one lithium bromide unit as refrigeration equipment; under normal conditions, one lithium bromide unit and one ammonia compressor are sufficient to meet the process requirements, with one ammonia chiller serving as a backup. Now the lithium bromide unit is damaged, and both ammonia-cooled machines have to be operated simultaneously to meet the process requirements. Since they are connected in parallel, after some time one of the ammonia storage tanks always ends up full while the other is empty. As a result, one of the ammonia-cooled machines often operates under high load while the other operates under low load. How can we ensure that the liquid levels in the ammonia storage tanks of the two ammonia compressors are equal? How can this be solved?
Hehe, this is very simple – just install a connecting pipe under the two storage tanks
The capacities of the two ammonia compressors are different; this is certainly due to differences in liquid level. The inlet flow comes from the evaporator in both cases. The compressor with a higher capacity consumes more fluid, and therefore more fluid ends up in the liquid storage tank after cooling. The compressor with a lower capacity consumes less fluid, so over time, one will have too much fluid while the other will have too little. If it is possible to shut down the machine, the solution is as mentioned above, but this is only possible if the outlet pressures of your two ammonia compressors are the same. If shutdown is not possible, regularly drain the liquid level.
I’m an outsider, and I’ve also wondered whether a connecting pipe would work or not
Are these two units not of different power? If the suction pressure is the same, that shouldn’t be the case. Perhaps your evaporative condenser has a low utilization rate, and it is unable to liquefy all the gas compressed by the ammonia compressor