Design analysis of turbines for co-generating micro-power plant working in accordance with organic Rankine's cycle

Abstract

Problems faced by designers of such turbines are associated with very small volumetric flow rate of working medium. It leads to small values of height of flow-part blades (hence to increased loss of flow rate) and high values of rotor speed, namely from a few dozen to over a hundred thousand rpm, usually.In all the considered variants the power plants operated on the Solkatherm ® SES36 working medium. Calulations were performed in compliance with the power plant schematic diagram shown in Fig. 1, for four values of the cycle's thermal power: 25 kW, 50 kW, 75 kW and 100 kW. Particular variants, depending on a heat power value, differred from each other only by value of working medium flow rate, and its parameters at turbine inlet, as well as pressure behind the turbine were the same for all the considered cases:-the pressure at turbine inlet, p 0 = 1464 kPa,-the temperature at turbine inlet, t 0 = 140 0 C, -the pressure behind the turbine, p 2 = 189 kPa.Within the frame of performed design analyses the following types of microturbines were taken into account:

Design analysis of ORC micro-turbines making use of thermal energy of oceans

“…In this situation attempts are to be made for the turbine cycle units to be properly optimised. Main attention was focused here on optimisation of the design parameters of the turbine working with selected low-boiling media [14].…”

Analysis of selection suitable low boiling media for micro CHP power plant

“…Zależy to od temperatury górnej czynnika T_3 i ciśnienia p_3. W układach, w których wykorzystywane są czynniki suche, ekspansja z punktu 3 do 4 zawsze kończy się w obszarze pary przegrzanej [11]. Płyny o prostszej budowie molekularnej są czynnikami mokrymi, natomiast bardziej skomplikowane wykazują tendencję przebiegu krzywej nasycenia drugiego rodzaju.…”

Gas Turbine Cycle with External Combustion Chamber for Prosumer and Distributed Energy Systems

“…R&D works are conducted towards the optimization of the biochemical processes of the bioreactor depending on the type of plant biomass and the use of biogas in the fuel cell [45,46]. The disadvantage of the domestic power generation sector is the relatively low efficiency of energy production from coal, and in the case of dispersed power engineering, the efficiencies of small power plants are even lower, and thermal power plants based on circuits with organic agents achieve efficiencies of only a dozen or so percent [47][48][49][50]. In addition, there is the issue of high carbon dioxide emissions [51].…”