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The aforementioned issues related to Biomass based ORC usage is summarized in table 2 and some considerations have been added to give important suggestions on cost reduction options.9 Items to be implemented Keep the maximum working pressure bellow 20 bars Maximum working temperature Reasons for cost reduction Less safety measures will be needed, less material cost Increases efficiencies Considerations Excessive superheat shall be prohibited to keep evaporator pressure high enough* However, in case of high available heat, to keep the evaporator max. pressure bellow 20 bars superheat will be done** Optimization should be performed. Excessive increase in not interesting.* Table 2: Cost reduction options in biomass ORC *For more details see chapter ΙΙ‐1. **Available heat source can be used in both evaporator and super heater. If more fraction of heat is used in evaporator, higher temperature and pressure in evaporator will be achieved. Since evaporator pressure above 20 bars will raise the cost of material and safety measures, if this pressure is reached in evaporator, more fraction of input heat will be used in super heater. Otherwise, it is interesting to limit the superheat. This can be done by designing the evaporator and super heater and pressure after the pump in a well manner. For super heating effect and adjusting pump pressure see chapters ΙΙ‐1 and ΙΙ‐6. 21 Comparison of ORC in biomass CHP plant with gasification and IC engines In biomass gasification, biomass will be converted to Hydrogen and Carbon Monoxide (Syngas) which is a suitable fuel. Gasification is an efficient and rather low cost energy conversion method to harness biomass energy and produce electricity.(For more information see APPENDIX: A‐2). 9 Ulli.Drescher, Dieter.Bru ̈ggemann, Fluid selection for the Organic Rankine Cycle (ORC) in biomass power and heat plants, Applied Thermal Engineering 27 (2007) 223–228. 12PDF Image | Exergy
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