1 问题的提出近年来,制冷行业发展迅速,建在城区的冷冻厂、冰棍厂(简称冷库)日益增多。据不完全统计,锦州市城区有冷库30～40座。这些冷库规模较小、储量不大,制冷装置多为二手的旧设备,使用的制冷剂大多为有毒的氨气(其毒性为中度危害程度)。由于这些冷库多位于人员密集的集贸市场或居民 1 Issues raised In recent years, the rapid development of the refrigeration industry, built in urban areas, frozen plants, popsicle factory (cold storage) is increasing. According to incomplete statistics, there are 30 to 40 cold stores in Jinzhou City. These cold storage small, small reserves, the refrigeration equipment is mostly used second-hand equipment, most of the refrigerant used is toxic ammonia (its toxicity is moderate degree of harm). As these cold storage and more concentrated in the bazaars or residents