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Investment and Economic analysis Investment costs are evaluated at around 540k€. The proposed waste heat recovery solution improves the efficiency of the biogas plant from 39 to 42%. It is interesting from two points of view: 1. With the same amount of biogas the annual production of electricity goes from 14 600MWh to 15 800MWh; 2. In France electricity from biogas can be sold at a price which depends on the efficiency of the plant: improving it by 3% leads to an increase of around 2 €/ MWh in the electricity tariff for the entire plant (engine and ORC) Thus, the ORC installation increases the existing tariff and therefore existing revenue by 25k€ and the additional electricity produced by the ORC module give an additional earning of 85k€. The Payback time for the investment is therefore below 5 years. A very interesting figure for energy suppliers, which is why several projects are already under development or running in France, Netherlands and USA. Ex-Works Transport Assembly Total Recovery heat exchanger ORC module Cooling tower Mechanical auxiliaries Civil works Project costs Conclusion 10 5 400 5 25 5 10 5 0 0 0 0 5 20 10 415 5 35 5 20 20 20 0 30 Total 445 20 45 540 This paper presents two case studies of waste heat recovery projects: valorization of hot gases from a coking plant in a steel mill and valorisation of exhaust from a biogas engine. The first one suffers from a low electricity price in the targeted country (France) but should be viable in the coming years or immediately by targeting other European countries. The second one is already economically viable due to a special feed-in-tariff or equivalent supporting measure. Other industrial sectors, which may be targeted are the glass industry (hot gas leave the furnace at around 400°C), and cement industry (one study showed that 40% of the energy used in the cement industry was lost in waste heat2). Nevertheless the first targeted projects should preferentially be located in countries where industries suffer from high electricity costs or electricity supply problems (electricity grid failure, damageable variations of electricity frequency) and where operating a dependable in-house system for electricity production is a solution. Exhaust gases from large diesel engines producing electricity on non-connected grids (e.g. on island for example) can also power an ORC module in order to improve the efficiency of these systems and reduce fuel consumption:PDF Image | Waste heat recovery projects using ORC
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