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Back Pressure Turbine

The Experts below are selected from a list of 183 Experts worldwide ranked by ideXlab platform

Totaro Goto – 1st expert on this subject based on the ideXlab platform

  • ion exchange membrane electrodialytic salt production using brine discharged from a reverse osmosis seawater desalination plant
    Journal of Membrane Science, 2003
    Co-Authors: Yoshinobu Tanaka, Reo Ehara, Sigeru Itoi, Totaro Goto


    Abstract Operating parameters of an ion-exchange membrane electrodialytic salt manufacturing plant (NaCl production capacity: 200,000 t per year) using brine discharged from a reverse osmosis (RO) seawater desalination plant are discussed. The results were compared with the data obtained from a salt manufacturing plant using seawater. The specifications of the electrodialyzer are: the thickness of the desalting cell, 0.05 cm; the flow-pass length in a desalting cell, 2 m; effective membrane area, 2 m 2 ; overall osmotic coefficient of a membrane pair, 30 cm 4 /(eq. h); and solution velocity at the inlets of desalting cells, 5 cm/s. The electrolyte concentration at the inlets of desalting cells was set at 1.5 eq./dm 3 , which is consistent with the electrolyte concentration of brine discharged from a reverse osmosis seawater desalination plant. The energy consumed in the salt manufacturing process was assumed to be supplied by a simultaneous heat-generating electric power unit using a BackPressure Turbine. The number of evaporators (evaporation pans) was selected to minimize the electric power shortfall of the salt manufacturing process but to be larger than zero. The electric power shortage was assumed to be made up by purchased electric power, which is generated by a condensing Turbine. The energy consumption in a salt manufacturing process was obtained by adding the generation energy in the BackPressure Turbine, the evaporation energy in the No. 1 evaporator in multiple-effect evaporators, the condensing energy in the heater in the No. 1 evaporator and purchased energy. The energy consumption in a salt manufacturing process using the brine discharged from a reverse osmosis seawater desalinating plant was 80% of the energy consumption in the process using seawater. The optimum current density at which the energy consumption is minimized was 3 A/dm 2 for both electrodialyses of brine discharged from the reverse osmosis desalination plant and of seawater.

M Z Abdullah – 2nd expert on this subject based on the ideXlab platform

  • analysis of biomass residue based cogeneration system in palm oil mills
    Biomass & Bioenergy, 2003
    Co-Authors: Z Husain, Z A Zainal, M Z Abdullah


    Abstract Palm oil mills in Malaysia operate on cogeneration system using biomass residue as fuel in the boiler. The boiler produces high Pressure and temperature steam which expands in a BackPressure steam Turbine and produces enough electric power for the internal needs of the mill. The exhaust steam from the Turbine goes to an accumulator which distributes the steam to various processes in the mill. The study were made on seven palm oil mills in the Perak state in Malaysia. The primary objectives of the study are to determine boiler and Turbine efficiencies, energy utilization factor, oil extraction rate and heat/power ratio for various palm oil mills working under similar conditions and adopting same processes. The palm oil industry is one of those rare industries where very little attempt is made to save energy. The energy balance in a typical palm oil mill is far from optimum and there is considerable scope for improvement. Bench-marking is necessary for the components in the mill. Energy-use bench-marking can give an overview of energy performance of the mills. The calculations were done to get net gain in power when Back Pressure Turbine is replaced by a condensing Turbine. It was found that the boiler and Turbine have low thermal efficiencies compared to conventional ones used in power plants due to non-homogeneity and non-uniform quality of the fuel. The extraction rate was around 0.188. The use of condensing Turbine increase the power output by 60% and the utilization factor was found to be 65% for the cogeneration system.

Zhihua Ge – 3rd expert on this subject based on the ideXlab platform

  • Energy and Exergy Evaluations of a Combined Heat and Power System with a High BackPressure Turbine under Full Operating Conditions
    Energies, 2020
    Co-Authors: Shifei Zhao, Weishu Wang, Zhihua Ge


    High BackPressure technology is a promising method for the waste heat recovery of exhaust steams in combined heat and power systems. In this research, a 300 MW coal-fired subcritical combined heat and power system was selected as the reference system, and modeled in EBSILON professional. Then, energy-based and exergy-based performances of the high BackPressure system and traditional combined heat and power system were compared under full operating conditions. Moreover, a novel exergy-based evaluation method, which considers the energy level of the heating supply, was proposed and applied to evaluate the two systems. Results show that: In design conditions, both the heating capacity and power output of the high BackPressure system were higher than those of the extraction condensing system, which led to 17.67% and 33.21% increments of the gross thermal efficiency and generation efficiency, respectively. Compared with the extraction condensing system, the exergy efficiencies of the high BackPressure system were 7.04–8.21% higher. According to the novel exergy-based evaluation, the exergy efficiencies for the generation of the high BackPressure system and extraction condensing system were 46.48% and 41.22%, respectively. This paper provides references for the thermodynamic performance evaluation of the combined heat and power system.

  • energy analysis of cascade heating with high Back Pressure large scale steam Turbine
    Energies, 2018
    Co-Authors: Zhihua Ge, Fuxiang Zhang, Jie He, Xiaoze Du


    To reduce the exergy loss that is caused by the high-grade extraction steam of traditional heating mode of combined heat and power (CHP) generating unit, a high BackPressure cascade heating technology for two jointly constructed large-scale steam Turbine power generating units is proposed. The Unit 1 makes full use of the exhaust steam heat from high BackPressure Turbine, and the Unit 2 uses the original heating mode of extracting steam condensation, which significantly reduces the flow rate of high-grade extraction steam. The typical 2 × 350 MW supercritical CHP units in northern China were selected as object. The boundary conditions for heating were determined based on the actual climatic conditions and heating demands. A model to analyze the performance of the high BackPressure cascade heating supply units for off-design operating conditions was developed. The load distributions between high BackPressure exhaust steam direct supply and extraction steam heating supply were described under various conditions, based on which, the heating efficiency of the CHP units with the high BackPressure cascade heating system was analyzed. The design heating load and maximum heating supply load were determined as well. The results indicate that the average coal consumption rate during the heating season is 205.46 g/kWh for the design heating load after the retrofit, which is about 51.99 g/kWh lower than that of the traditional heating mode. The coal consumption rate of 199.07 g/kWh can be achieved for the maximum heating load. Significant energy saving and CO2 emission reduction are obtained.