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一、国外合成氨厂的发展概况 (一)1966年以后,随着原料路线的改变和化工机械设备研制工作的进展,国外合成氨厂逐渐向大型化发展。1968年国外已投产的318个合成氨厂中,20万吨/年以上规模的工厂共40个,占总数的12.6％(其中30万吨/年的工厂16个,占总数的5％);而1968年正在建造和设计的121个合成氨厂中,20万吨/年以上规模的工厂共49个,占总数的40.5％(其中30万吨/年的工厂共22个,占总数的18.2％)。1968～1970年国外建设的83个以天然气和石油为原料的合成氨厂中,600～1650吨/日的工厂有53个,占总数的63.8％(其中900～1100吨/日的工厂有23个,占总数的27.7％)。1971年美、英、法、
First, the overview of the development of foreign ammonia plant (A) After 1966, with the change of raw material routes and the development of chemical machinery and equipment work, the foreign ammonia plant gradually to large-scale development. Of the 318 ammonia plants that have been put into operation in foreign countries in 1968, 40 were 200,000 tons / year or more, accounting for 12.6% of the total (16 of them 300,000 tons / year, accounting for 5% of the total); and Of the 121 ammonia plants being built and designed in 1968, 49 plants with a capacity of 200,000 tons / year or more accounted for 40.5% of the total (22 of them 300,000 tons / year, accounting for 18.2% of the total) . Of the 83 ammonia-based ammonia plant built overseas from 1968 to 1970, 53 plants with a total capacity of 600 to 1,650 tons / day accounted for 63.8% of the total (of which, 23 plants at 900 to 1,100 tons / day , Accounting for 27.7% of the total). 1971 United States, Britain, France,