热联合在合成氨节能降耗中的应用

Use of Heat Integration in Ammonia Production for Conservation of Energy and Raw Materials

合成氨生产既需要大量的能源作为其原料和动力支撑,又在制取氨的过程中消耗大量的电能、热能、机械能和化学能等,因而探讨合成氨生产过程系统的用能经济模式一直是化肥企业节能降耗的重点工作之一。通过2年多厂级间、装置间的热联合应用,以三环节能量综合优化方法和数理统计方法为基础,逐步摸索出1套适合化肥企业生产的蒸汽输入和输出量,不仅使合成氨装置的综合能耗和全厂综合能耗得到显著下降,节约了大量的天然气、电和水,而且有效降低了尿素生产成本,为企业的节能降耗、降低成本和增加效益起到了积极作用,同时提高了产品的市场竞争力。

The production of ammonia not only requires a lot of energy as a support for its raw materials and power, but also consumes a large amount of electrical, heat, mechanical and chemical energy in the process of manufacture of ammonia, so one of the major works of chemical fertillizer producers has always been to inquire into the economic pattern of energy consumption. After over two years of heat integration among plants and units, based on the methods of three-link energy saving com- prehensive optimization and methematical statistics, a set of steam input and output has been progres- sively found out, suitable for use in chemical fertilizer plants, thereby the overall energy consumption of the ammonia unit as well as that of the whole plant decreases markedly, saving a lot of natural gas, power and water, also the production cost of urea is effectively lowered, thus playing a positive role in the conservation of energy and raw materials, reduction in cost and improvement in benefit and product market competitiveness.