With these methods, the urea quality reaches that of national fine grade, the corrosion of the converter and other HP equipment is obviously decreased, the ammonia consumption of per ton urea is reduced by a large degree, the condensate from hydrolysis and stripping is completely recovered, and the urea cost is lowered down in a large scale.

This paper analyzes the reasons why resulting in high ammonia consumption in urea plant,and takes corresponding measures by equipment and process in order to depress ammonia consumpting.

As a result, ammonia production capacity can be increased and ammonia consumption can be decreased.

The Synthetic ammonia process is transformed with old ammonia cooler to decrease outlet temperature of gasfor increasing production and reducing consumption of energy and raw materials.

Reliability analysis of freezer ammonia refrigeration system base on FMEA;

In this thesis, the author importantly clarified the process engineering of natural gas which used in the development of Sulige gas field, the process engineering is ammonia refrigeration and low temperature separation, dehydration and dealkylation, and analyzed the operation effect of the processing.