The advanced coal chemical plant is gradually replacing the fixed bed technology.As for synthetic ammonia and urea plants with longer production line,their total withdrawal will cause huge loss to the enterprises.In order to make up for the loss,under the precondition of air head substitution,the subsequent utilization of synthetic ammonia and urea plants will bring benefits to the enterprises in a certain period of time.In the advanced coal gasification technologies,ammonia synthesis unit is often the bottleneck in the production capacity of the whole ammonia plant,and there is still a certain capacity of the gasification and purification units that cannot be utilized.Therefore,the excess gasification and purification capacity in the advanced coal chemical industry is combined with the fixed bed follow-up units to transform and utilize to achieve the production of synthetic ammonia and urea at a small increase in investment.
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