Abstract
The paper continues the study of reconversion of a 400 kW hot water boiler in a steam generator suitable to valorise the energy content of briquettes and pellets of agricultural biomass. After steam parameters selection (pressure, temperature, mass-flow rate), an overview of main steam machines types (axial, radial, screw, piston engine) is done. Further, a parallel design of most wide-spread ones (Laval, Curtis and radial) were performed, at different rotation speeds, in order to find the best configuration in respect with the flow section dimensions, internal efficiency and power (electrical and thermal) output. The results of the paper could be very useful for the investors in agricultural “waste-toenergy” projects in order to select appropriate technology and equipment.
Highlights
During last 15 years, the authors belong to a large research team who studied the biomass by-products in useful energy to be used locally or remote. One of these researches [1] was focused on mini thermal steam power plant able to give economic value to new energy willow crops developed in our Country
In a previous recent paper [2] we focused on the feasibility to convert a hot water boiler powered by solid biomass waste into a steam generator, in order to couple it with a condensing or backpressure steam turbine
Kubawara et al [8] present the design characteristics of a micro steam expander based on the screw principle, with outputs of 12-132 kW, with internal efficiencies of 60-70 %
Summary
During last 15 years, the authors belong to a large research team who studied the biomass by-products (solid, liquid and gaseous) in useful energy (thermal and electrical) to be used locally or remote One of these researches [1] was focused on mini thermal steam power plant able to give economic value to new energy willow crops developed in our Country. Kubawara et al [8] present the design characteristics of a micro steam expander based on the screw principle, with outputs of 12-132 kW, with internal efficiencies of 60-70 % Another manufacturer [9] gives the range of electric power for its products (50 – 200 kWe) and announces other advantages: Efficient operation in the conditions of wet steam Excellent ratio power/weight Working life min. Alford et al [10] offer a comprehensive analysis of a microturbine based upon an integral high speed air compressor, optimised by means of numerical modelling, designed, manufactured and tested in a wide range of conditions with good efficiency and endurance results
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