This method can be used in the laboratory to test the presence of NH3 or ammonia. Industrially, the weak alkalinity of ammonia is used to absorb sulfuric acid industrial tail gas to prevent environmental pollution. When the ammonia water is small, insoluble weak alkali or amphoteric hydroxide is produced. When the ammonia water is excessive, the insoluble substances are converted into complex ions and dissolved. One of the reasons for volatilization is the decomposition of ammonia monohydrate.
In addition to the direct impact of liquid ammonia leakage on the human body, that is, the explosive boiling phenomenon caused by the rapid boiling of the liquid and a large amount of overheating. At present, most of the refrigeration system projects in China's cold storage, food processing, beer, beverage, and petrochemical projects use ammonia as the refrigerant. In addition, there are other refrigerants such as halogenated chlorofluorocarbons and carbon dioxide. The price is cheap, the required volume of the heat exchanger is smaller, the pipe fittings are smaller, and the cost is saved.
In addition, the special pungent odor of ammonia can be detected by the human sense of smell when it is small, which is also helpful for early detection of leakage. The key issue of ammonia refrigeration system is safety. In terms of safe evacuation distance, ammonia refrigeration system safety and protection, automatic ammonia leakage detection and accidental ventilation, etc., make a comprehensive plan to prevent and reduce the hazards of ammonia leakage.