Based on analysis of the development trend of ammonia synthesis technology,the author presents the direction of revamping for ammonia synthesis system in medium sized nitrogenous fertilizer plant.

In view of the practical situation for blowing gas recovery in M sized nitrogenous fertilizer plants connecting with the modification of process flow for gas making system,it is discussed in this paper the centralized recovery technology for blowing gas being applicable to M sized nitrogenous fertilizer plants and the economic and social benefits produced with the application of this technology.

This paper stated the reason and harm of producing waste gas,the way of dealing with and effects in small nitrogenous fertilizer factory.

Process on co-production of super-fine calcium -carbonate in nitrogenous fertilizer plant;

Through two kinds of thermodynamic analvsis on the freezing section ofameduim-sized nitrogenous fertilizer plant,this paper attempts to study,in not onlyquantity but also quality,the energy utilization ratio.

Process analog was made for heavy oil gasification procedure of middle sized nitrogen fertilizer plant using the HYSIM chemical process analog system, process analog is also made for gasifier through the mixed model calculated by gasifier analog.

A combination process with physicochemical-biochemical techniques to treat nitric fertilizer wastewater is introduced in this paper.