The Study On Technological Transformation Scheme Of Expanding Production Capacity Of The Reforming System To 90kt/a, In Synthetic Ammonia Plant, Honghua Group

The production capacity of Soda ash, which producted through Hou's process manmufacture, is 340kt/a,which is the eighth largest in China, in Honghe chemical industrial co.Ltd,ZiGong. The total production capacity of the synthetic ammonia which is match the Soda system, is 120kt/a,half of which is contributed by the system which is adopted traditional two-stage reforming process. With the development of the economy of China, the quantity of Soda ash needed must be increasing year by year in China. So HongHua group determines to expand the Soda system to 420-450kt/a,and so we must corresponding to increase the production capacity of the synthetic ammonia system to 150kt/a.In the past twenty years, the domestic and foreign hydrocarbon steam reforming process technology has made remarkable strides, and been applied profitably in some domestic nitrogen fertilizer plants. In this paper, I'd studied comparatively the chief hydrocarbon steam reforming process and the reformer in technology technique, equipment characteristic,building period, investment etc. According as the natural gas resources, fund, and technique level etc of Honghua group, we decide to choose the process of the parallel auto-thermal reforming process to rebuild the system, and rises it's production capacity up to 90kt/a.This process realizes the semi self-heating equilibrium of the reforming system, and so the consume natural gas in ration ammonia is about 850Nm3/tNH3, therefore,the cost of the ammonia is cut down greatly when compared with the traditional two-stage reforming process.The temperature of the secondary reformer's blast chamber is circa 1200â–¡, so the condition of the operation is moderate, equipments hardly to be spoiled because of the overtemperature,and the system runs more steadily. In the system,the auto-thermal reformer is parallel connected with the first reformer,in both the first stage-reforming is completed.The first reformer's production capacity is 50kt/a,when the auto-thermal reformer is 40kt/a. Therefore,it's not necessary to rebuild the radiation section of the first reformer,there is only need to transform the convertion to meet the pre-heating requirement of main materiel.Comparing with the traditional two-stage reforming process,it can shorten the building period. The total funds of this scheme needs is about RMB 13 million yuan.Base on the comparative study of the foregoing two scheme,the conclusion is that it can economize funds,cut down the cost, have the high credibility and stabilization,while it meet the requirement of the increase production capacity, when we adopts the parallel auto-thermal reforming process and the high efficiency auto-thermal reformer to increase the new system's production capacity to 90kt/a.