Economic optimization of liquid chlorine refrigeration units.
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This post was last edited by sunjl1981 on 2013-1-6 at 21:40. The liquid chlorine production in our facility uses the medium-temperature and medium-pressure method (as stated in the technical documentation). The chlorine gas pressure is 0.38 MPa; screw compressors are used, with R22 as the refrigerant. The liquefaction temperature ranges from -10 to 5 degrees Celsius, with -4 degrees Celsius being the typical value. The inlet pressure for the compressor is between 0.15 and 0.46 MPa, with 0.30 MPa being the usual value. The excess chlorine is sent to a specialized company; this company also processes some of the compressed chlorine, and its price is the same as that for the excess chlorine. I wonder whether it is possible to reduce the liquefaction cost per ton of liquid chlorine by increasing the liquefaction temperature. # + + . hcbbs
The chlorine pressure used by the poster is already higher than that of many other manufacturers I’ve seen; accordingly, the liquefaction temperature is also high. The suction pressure of the compressor is high as well. The current setup is already quite efficient, yet further optimization is still possible. How can other manufacturers keep up? I wonder what measures the poster has taken to increase the liquefaction temperature. Could the poster explain in detail? It seems that when the liquefaction temperature is at -10, the suction pressure of the compressor becomes a bit lower – could this be due to a larger amount of liquid being produced? Communicate again
The key is to look at the liquefaction efficiency. There are several factors that affect the improvement of this efficiency: 1. Chlorine purity； 2. Hydrogen content in chlorine gas ； 3. Liquidation temperature ； 4. Chlorine pressure.
Reply 1# ttrock: Raising the liquefaction temperature can be used to reduce the liquefaction cost per ton of chlorine gas, but it is also necessary to consider the balance of the amount of exhaust gas, as an increase in liquefaction temperature leads to an increase in the amount of exhaust gas.