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我厂原有预冷蔬菜的冷却池二个,它的作用是利用冷却池中冷却水将热烫后的蔬菜迅速冷却至5℃左右,再送入冻结装置速冻。冷却水采用氨为制冷剂的双头螺旋管式蒸发冷却,供液为直接供液形式。使用几年来效果不理想,每天冷却水从20℃降至5℃约需1～2小时。且较难控制供液量,供液少了,氨蒸气返回压缩机的过热度太高;供液多了,容易造成湿行程,压缩机发生倒霜事故,因此决定改进供液形式。限于该冷却池属单一小冷却设备,开始我曾考虑改用重力供液型式,但由于它是利用
I plant the original cooling two pre-cooling vegetables, and its role is to use the cooling water in the cooling pool after the blanched vegetables quickly cooled to about 5 ℃, and then into the freezing device frozen. Cooling water using ammonia as the refrigerant double helix tube evaporative cooling, the liquid supply for the direct form. The use of several years of unsatisfactory results, daily cooling water from 20 ℃ to 5 ℃ takes about 1 to 2 hours. And more difficult to control the amount of liquid supply, less liquid supply, ammonia vapor return compressor overheating is too high; for more liquid, easy to cause wet stroke, the compressor down accident, and therefore decided to improve the liquid form. Due to the fact that the cooling pool is a single small cooling device, I started to consider the use of gravitropic liquid type, but since it is utilized