低温载冷剂乙二醇和丙二醇水溶液的工程应用

Engineering Application of Low-temperature Secondary Refrigerant Ethylene Glycol and Propylene Glycol Aqueous Solutions

低温载冷剂乙二醇和丙二醇水溶液在低温制冷系统中应用越来越广泛,了解其特性,对于工程应用和安全运行十分必要。本文对乙二醇和丙二醇水溶液的热物理性能、腐蚀性、安全与环保性能、经济性进行了对比分析,针对工程常见的问题提出了解决措施。结果表明:乙二醇水溶液的抗冻能力、管道阻力降、传热性能优于丙二醇水溶液,经济性更好;乙二醇低毒,不易生物降解,其水溶液的毒性和刺激性更大,腐蚀性强;丙二醇无毒,易生物降解,其水溶液更安全、环保。

The low-temperature secondary refrigerant ethylene glycol and propylene glycol aqueous solutions are widely used in low-temperature refrigerating system.It is necessary to understand their characteristics for engineering applications and safe operation.A comparative analysis was conducted on the thermal physical properties,corrosiveness,safety and environmental protection performance,and economy of ethylene glycol and propylene glycol aqueous solutions,and solutions were proposed for common engineering problems.The results show that the frost resistance,pipeline resistance drop,and heat transfer performance of ethylene glycol aqueous solution are superior to those of propylene glycol aqueous solution,good economy;Ethylene glycol has low toxicity and is not easily biodegradable,the toxicity and irritation of aqueous solutions are greater,strong corrosiveness;Propylene glycol is non-toxic,easily biodegradable,and its aqueous solution is safer and more environmentally friendly.