一、问题的提出 我厂是一座年产15万吨合成氨,耗煤焦30万余吨的大型化肥企业。煤、焦原料约占产品成本60％左右。近几年来,由于煤、焦连续几次提价,产品成本逐年上升,主要产品相继出现亏损,各级领导非常关注,几次组织有关人员研究应用价值工程方法,探讨原料搭配问题,消化原料涨价因素,以降低成本,增加企业盈利。 二、VE对象的选择 在原料紧张,大幅度涨价情况下,煤、焦比例搭配,是影响合成氨的产量和成本的关键。因而,利用现实能供应的煤焦资源,并充分利用边角余料,按照 First, the issue put forward I plant is an annual output of 150,000 tons of synthetic ammonia, coal consumption of more than 30,000 tons of large-scale fertilizer companies. Coal, coke raw materials account for about 60% of product costs. In recent years, coal, coke several consecutive price increases, product costs increased year by year, the major products have a loss, leaders of all levels are very concerned about the organization of personnel several times to study the value of engineering methods to explore raw materials with the problem of digestion raw materials up Price factors to reduce costs and increase corporate profits. Second, the choice of VE object In the raw material tension, a substantial price increase, coal, coke ratio with the impact of the key to the output and cost of ammonia. Therefore, the use of realistic supply of char resources, and make full use of more than expected corner, according to