Export Steam Credit

As the export steam credit increases, the economics for the Modem plant become more favorable. For example, if the export steam credit were changed from 5 to 10 per M lbs (double the base case credit), the overall production cost would drop by 0,450 per M SCF of hydrogen for the Modem plant and 0,100 for the Old Style plant. The higher steam credit would increase the average annual savings for the Modem plant from 12.9 MM to 24.4 MM. 

Refiners have a number of different options to consider in addressing the demand for additional hydrogen. A comprehensive technical and economic evaluation of existing operations is required to determine the optimum 

Today s Modem hydrogen plants take advantage of numerous technological improvements and offer a much more efficient plant with lower overall life cycle cost. Once technical and economic evaluations are performed, it should not be surprising that the most economically attractive and most feasible approach may be to build a new hydrogen plant. 

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Economie parameters for each refinery are different. The major parameters that can significantly alter these results are the efifieiency of the existing plant, the feed and fuel price, and the export steam credit. The... 

The cost of feed and fuel is typically the largest component of the overall production cost of hydrogen. Feed and fuel usually account for more than 80% of the total before the steam credit is taken. The overall operating cost changes significantly as the natural gas price varies. Figure 10 shows the effect of varying the natural gas price. For this evaluation, the export steam credit to natural gas price ratio was held constant. 

In assessing the true cost benefits associated with a steam saving, the steam and power balance for the site utility system must be considered, together with the costs of fuel and power (or power credit in an export situation). In general, a surplus of steam resulting from a steam saving in a process demand can be exploited by... 

Imported energy only Excludes a potential positive credit of 0 to 0.72 GJ/t for low pressure steam (depending on export possibihties for low pressure steam). ... 

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