This article mainly discusses the common problems of poor bactericide effect by addingchlorine and water quality spoilage existed in circulating water in ammonia plant.

Through analysis of the circulating ammonia pump s actual operation,with the impeller cutting theory of the centrifugal pump,after the detailed theoretical analysis and computation,cutted the three circulating ammonia pumps impeller.

Practicability of district heating using heat pumps with circulating water of power plant as heat source;