Steam Reforming Ammonia Plants

In addition the investment cost for conventional water electrolysis is rather high, about 1 000 DM/kWe] in 1989. This would give a total investment for a world-size plant capacity 1 200 t/d of ammonia, which is about 2.5 times the value of a natural-gas-based steam reforming ammonia plant [590],... 

Table 33. Examples of aMPF.A process options in steam reforming ammonia plants ...

After bulk removal of the carbon oxides has been accomplished by shift reaction and C02 removal, the typical synthesis gas in steam reforming ammonia plants still contains 0.2-0.5 vol% CO and 0.005-0.2 vol% C02. In partial oxidations the residual CO content after the shift conversion is usually higher, around 1.5-2.5%. These compounds and any water present have to be removed down to a very low ppm level, as all oxygen-containing substances are poisons for the ammonia synthesis catalyst [735). 

Figure 104. Block diagram and gas temperature profile for a steam reforming ammonia plant...

Table 36. Development of ilie nei energy consumption of natural gas based steam reforming ammonia plants (rea plant data) in GJ/t NH ...

Steam Reforming Ammonia Plants. Table 42 summarizes the achievable emission values for steam reforming ammonia plants [1323]. 

Mohri, T., Takemura, K., and Shibasaki, T., Application of advanced material for catalyst tubes for steam reformers. Ammonia Plant Safety, 33 86-100 (1993). 

TABLE 9.8. The First US Steam Reforming Ammonia Plants." ... 

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