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Colloquium FLUID DYNAMICS 2012 Institute of Thermomechanics AS CR, v.v.i., Prague, October 24 - 26, 2012 DESCRIPTION OF ORC MICROTURBINE FLOW p.1 Andrey Rusanov1, Piotr Lampart2, Jerzy Głuch2, Sebastian Bykuć2, Mariusz Szymaniak2, Daniel Stępniak2 1Institute of Mechanical Engineering Problems, National Ukrainian Academy of Science in Kharkov, 2Institute of Fluid-Flow Machinery, Polish Academy of Sciences in Gdańsk A promising technology for small scale cogeneration systems is Organic Rankine Cycle (ORC) where electricity is produced by a generator driven by a turbine operating on vapours of special low-boiling liquids. A new 100 kW ORC facility is built at IFFM with a multistage axial turbine working on MDM (Octamethyltrisiloxane). Fig. 1 shows a diagram of the cycle and a model of the test rig. Main components of this cogeneration cycle are ecological boiler fit to combust different kinds of biomass or biofuels, intermediate heat cycle to extract heat from flue gases to thermal oil as a heat carrier, evaporator, turbine with a low boiling liquid as a working medium, recuperator, condenser and circulating pumps for the working medium and thermal oil. In the presented heat cycle, electric energy is a by-product and amounts to less than 20% of the total supplied heat. Behind the turbine, the remaining superheat and condensation heat of the working medium is used for heating water for the district heating network. The solution offers a possibility to apply low temperature heat sources, allows utilisation of different types of fuels and modular construction, which facilitates adaptation of the CHP unit to the required power range. One can think of micro CHP units dedicated for individual households of total heat capacity up to 20kWt and electric power up to 4kWe as well as small CHP modules dedicated for communal energy centres of total heat capacity 500kWt and electric power 100kWe (maximum up to 5 MWt and 1 MWe, respectively). Fig. 1. The ORC cycle for MDM and the model test rig. A number of turbine designs (multi-stage axial turbine and single stage radial/axial turbine) have been selected for 3000, 9000 and 14000 rpm generators. The turbine and generator are placed in a hermetical casing and are lubricated by the liquid of the working medium. The blading system for the 9000 rpm turbine design (mass flow rate 1.5 kg/s, inlet pressure 12 bar) consists of 7 stator/rotor stages (Fig. 2).PDF Image | DESCRIPTION OF ORC MICROTURBINE FLOW
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