Turning Process Waste Heat into Power Using Organic Rankine Cycle Technology

Industry sectors and business owners are continuously looking for ways to drive costs down by reducing their energy consumption to be more competitive.


To summarize, several parameters must be evaluated at the beginning of a waste heat recovery project:

The flow rate of the exhaust gas or other heat source forms.The temperature of the exhaust gas or other heat source forms.The composition of the exhaust gas or other heat source forms.

All these factors determine the total available thermal energy and are used to select optimal heat exchangers.

After identifying usable heat sources based upon the available heat source temperature and flow rate, the next step is to select an ORC technology vendor. Here are some essential factors to consider during the vendor selection process:

Proven technology.ORC system overall efficiency.System maintainability and total operating and maintenance costs.Auxiliary equipment selection and associated costs.Project lifecycle cost.System reliability and availability.

The other important aspect for any waste heat recovery project is to determine the accepted financial payback period. The economic potential of an ORC waste heat recovery system depends on the capital recovery, which in turn, depends on the annual energy (normally fuel or electricity) savings. Some facilities use the power generated by an ORC system internally in their manufacturing process to offset electricity costs. Some sell the electricity back to utility grid. Some do both. The final usage of the power determines whether the benefit or savings will be realized within the financial payback expectation, and it further dictates the total project budget.

Source: www.process-heating.com


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