新概念氨工艺简介及评述

TNTRODUCTION AND REVIEW OF THE NEW CONCEPTAMMONIA PROCESSES

新概念氨工艺流程（ＬＣＡ与ＫＲＥＳ）取消了建设费用高昂的传统直热式一段炉及其废热回收设施，二段炉废热回收系统由转化换热器代替。新工艺特点是：工艺流程短，设备结构简单，易于操作与维修，能量利用率高，工艺排放物少等。新建厂采用新工艺，其投资将明显降低，但若借以改造旧装置，则应具备良好的界外供汽条件并考虑高投入与低产出。

In new concept ammonia processes(both LCA and KRES)the expensive conventional fired primary reformer and its waste heat recovery facillities are canceled and the second reformer heat recovery facilities are replaced by a reforming heat exchangerThe new concept ammonia processes have the following featuress short process flow,simple eguipment construction,easy to operate,to control and to maintain,maximum energy efficiency and minimum process emission impact,etcThe lower capital cost shall be gained if this new process flow is used by a grassroot plantHowever,the conditions of steam supply outside plant fence and the status of low yield,high capital cost must be considered,if it is used to retrofit the existing ammonia plants