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| Reducing residual solvent in exhaust by mineral oil absorption system |
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| DOI： |
| KeyWord:refrigeration system absorber residual solvent in exhaust leaching plant |
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| Abstract: |
| Through chemical simulation software Pro II, the process of reducing residual solvent in exhaust by mineral oil absorption system assisted with refrigeration technology in leaching plant was simulated and optimized, and it was used in 5 000 t/d soybean leaching plant. The results showed that the low-temperature water generated by refrigeration system could reduce the partial pressure of hexane in exhaust, which may reduce the absorber load. When the absorber inlet gas temperature reduced from 33 ℃ to 10 ℃, the total exhaust mass flowrate and hexane mass flowrate were reduced by 41.6% and 73.2%, respectively. Lowering the mineral oil temperature of absorber inlet, the residual solvent in exhaust first decreased and then increased, and reached the minimum value at 25 ℃. The total condensation load of refrigeration system of 5 000 t/d soybean leaching plant was 578 379 kJ/h, and the heat exchanging areas of vent gas condenser and mineral oil cooler were 90 m2 and 15 m2, respectively. Practical application results showed that controlling absorber gas inlet temperature 10 ℃ and mineral oil inlet temperature 25 ℃，the residual solvent in exhaust was reduced from 3 000 mg/m3 to 800 mg/m3, and residual solvent in exhaust was reduced by 73.3% |
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