Ammonia is used in the production of ammonia water, nitrogen fertilizer (urea, ammonium bicarbonate, etc.), compound fertilizer, nitric acid, ammonium salt, soda ash, etc. It is widely used in chemical industry, light industry, chemical fertilizer, pharmaceutical, synthetic fiber and other fields. Nitrogen-containing inorganic salts and organic intermediates, sulfonamides, polyurethane, polyamide fibers and nitrile rubber all need ammonia as raw materials. In addition, liquid ammonia is commonly used as a refrigerant, and ammonia can also be used as a biofuel to provide energy.