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special tariff. In this case, the tariff applies to electricity produced via the recovery of heat from engines or micro-turbines running on biogas. We will focus in particular on a project valorising thermal energy from a Jenbacher JMS 612 biogas engine. Heat source characteristics Biogas engines have two sources of thermal energy at two levels of temperatures: Exhaust gas: generally at a temperature above 400°C: it can be cooled down to 180 ° C without any risk of condensation of corrosive components. Potentially recoverable thermal energy represents roughly 20% of the input power ; Engine cooling loop (hot water at 90°C): depending on the engine size, the potentially recoverable thermal energy represents roughly 25% of the input power. These two sources can be recovered by ORC technology. Exhaust gas can be used to run a high temperature module (like Tri-O-Gen) with a high conversion ratio (around 20%). The water loop combined with the exhaust gas can also be used to run a module operating at a lower temperature (like Calnetix) As with the coke plant project, a bypass loop is installed on the exhaust to allow recovery of thermal energy without disturbing the biogas engine operation. Project sizing The engine studied produces around 1 450kWe with an efficiency of 39%. The amount of recoverable energy in exhaust gases is around 800kWth between 470 and 180°C. This energy is in our case lost as no potential thermal consumer has been identified. The characteristics are sufficient to consider the installation of a high temperature ORC module such as the one proposed by the Dutch manufacturer Tri-O-Gen (see the picture on page 8) to improve electrical production by 8%. The module produces 160kWe gross (145kWe net) at full load with an efficiency of 20% using Toluene as the working fluid. Toluene does not require specific safety devices as the module contains a relatively small amount of fluid (~300l) and the manufacter has already taken all the necessary measures to avoid leakages. The installation requires a cooling loop between 35 and 50°C (using a dry cooling tower). A particularity of this module is the possibility to avoid the usual intermediate loop between the heat source and the module: the exhaust directly feeds the evaporator.PDF Image | Waste heat recovery projects using ORC
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