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河北冀南磷化工业公司磷铵车间为实现废水零排放，在对生产用水、排放废水进行水平衡计算的基础上，得知磷铵混合冷凝器的冷却水量占排放废水的６３％。采取设置３台冷却器，将各处废水降温冷却（其中第２台冷却器用于蒸发液氨，以节省蒸汽），然后进入循环水池、循环利用，实现了废水零排放；降低了耗水量，吨磷铵耗水由１０．１５吨降为３．３吨，年节水２０万吨，价值２０多万元；吨磷铵耗烟煤下降３６．７ ｋｇ，年可节省烟煤１４７０吨（标煤），价值 ２９万元。
Based on the water balance calculation of production water and waste water discharge, the workshop of ammonium phosphate plant of Hebei Jinan Iron and Steel Phosphorus Chemical Industry Co., Ltd. realized that the cooling water of the ammonium phosphate mixed condenser accounts for 63% of the discharge wastewater. By setting three coolers to cool down the waste water throughout the project (of which the second cooler is used to evaporate liquid ammonia to save steam), and then into the circulating water tank, recycling, to achieve zero discharge of waste water; reduce water consumption, tons Phosphorus ammonium water consumption reduced from 10.15 tons to 3.3 tons, the annual saving 200,000 tons, the value of more than 20 million yuan; tons of phosphorus ammonium consumption of bituminous coal decreased 36.7 kg, can save 1470 tons of bituminous coal (standard coal) , The value of 290000 yuan.