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近年来,各地纷纷建起小型氮肥厂,据不完全统计,目前我国有碳酸氢铵氮肥厂1400多个,按合成氨产量划分,年产氨低于4.5万吨的小型氮肥厂占90％以上。其生产工艺基本一样,即用原煤燃烧造气发生CO—CO_2,经水洗、脱硫、精炼、转换与氨水中和,母液离心甩干成碳酸氢铵,成品装入塑料袋外运。生产过程中,由于设备系统的跑冒滴漏,精炼、合
In recent years, many small nitrogenous fertilizer plants have been built around the country. According to incomplete statistics, there are over 1,400 ammonium bicarbonate nitrogenous fertilizer plants in our country. According to the output of synthetic ammonia, small-sized nitrogenous fertilizer plants with an annual output of less than 45,000 tons of ammonia account for more than 90%. The production process is basically the same, that is, CO-CO_2 is produced from coal combustion and gasification, washed, desulfurized, refined, converted and neutralized with ammonia water, and the mother liquor is centrifuged and dried to be ammonium bicarbonate. The finished product is packed in plastic bags. Production process, due to dripping equipment leaching, refining, co-operation