About chilled water for large air separation plants
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Chilled water in large-scale air separation units is mainly used to cool the air (wash it to 5-8°C). Generally, the cooling capacity of the chilled water should be provided by ice machines or ammonia cooling. Let’s discuss how to consider the normal operation of the air separation in case of shutdown and ammonia compressor accident for the solution that only uses ammonia cooling to provide cooling capacity.
You can consider not using this kind of equipment. You can make full use of the waste gas and use the waste gas from the cold box to cool the water. (I don’t know how big the large air separation you are talking about is.) This post was last edited by super1 on 2008-2-4 13:08 ]
What does Yuntianhua Co., Ltd. do? It takes 60,000 yuan to divide such a big space
The source of chilled water cooling has been cut off. How can we ensure normal operation? However, we can reduce the load and run it for a short period of time.
Generally, air separation uses the cooling capacity of the recycled pollutant nitrogen N2, but the temperature after reheating cannot cool the air to the required temperature. A separate ice machine or a small amount of chilled water in the pipe network needs to be added. As for the ammonia adding machine, our company has not adopted such a solution, and we don’t know much about safety.
For an air separation of 60,000, I wonder what the amount of nitrogen is? If it is in the petrochemical industry, the amount of nitrogen used may be relatively large? Exceeding the oxygen-to-nitrogen ratio 1: 1.4? In fact, it is a common method to use the waste gas from the device? However, if the nitrogen is rich, you can consider the method of partial nitrogen or incomplete nitrogen coming out of the plate to directly enter the nitrogen cooling tower for cooling, but this needs to be proposed at the beginning of the design. As for the method of reducing production without chilled water, everyone has their own successful experience. We can learn from each other, but the methods are the same.
study* study * :) :victory: :handshake
Generally speaking, equipment manufacturers will consider the normal operation of air separation during shutdown and ammonia compressor accidents, and will provide you with specific operation plans. In fact, there are many factories that only provide cooling capacity solutions for ammonia cooling. During startup, shutdown, and ammonia compressor accidents, the air temperature at the outlet of the air cooling tower is high, and the molecular sieve is not operating at the designed load. You only need to change the molecular sieve operating time (the equipment manufacturer determines it by calculating the carbon dioxide breakthrough time), and then change it to the original time after the ice machine is restored.