Cycle Tempo Research Articles

Novel integrations of molten salt cavity tubular solar central receiver with existing gas-fuelled conventional steam power plants

This paper introduces a new method to integrate the existing equipment of the AL-Hartha steam plant located in Basra, Iraq, using a molten salt cavity tubular solar central receiver (SCR). Cycle Tempo is used to simulate the existing natural gas-fuelled conventional steam power cycle with consideration of the heat and pressure losses. The heliostat field and the central receiver subsystems are coded using MATLAB. The model couples the heat balance with the temperature computation of the receiver walls for calculation and analysis of the thermal losses. The proposed modified codes are capable of calculating heat losses, evaluating the integrated power plant and satisfying a wide range of SCRs. The results are verified against plant data and previous works in the literature and good agreement is obtained. The results show the potential of using a molten salt cavity tubular for low-range temperature to integrate the economizer (EN) and air preheater, as well as the optimum scheme for the integration of the existing plant with an SCR. It is observed that the best improvement for the existing AL-Hartha steam plant and the integrated molten salt cavity tubular SCR can be achieved by integrating EN, and there is about 9.1% saving in gas fuel consumption.

Simulation of Solar Organic Rankine Cycle System Using Turbocharger with Cycle Tempo and Environmentally Friendly Fluid

Organic Rankine cycle (ORC) is a modified rankine cycle with working fluids, of organic material (Refrigerant). Refrigerant pentane has low boiling point, therefore ORC can be used in power plant which uses low temperature resources, such as solar thermal exhausted gases and geothermal wells. Organic Rankine Cycle (ORC) is used to convert heat energy into mechanical energy or electricity generated by a low temperature of the hot sun. The working fluid used is HCR12, HCR22, HCR134a and Pentane. Simulations performed with an organic Rankine cycle temperature and pressure with cycle tempo program. By programming the simulation cycle tempo and got the result on the maximum power a turbine to the conditions of the working fluid Pentane to the input turbine T = 700C and pressure = 2 bar can generate 2.07 kW. Turbocharger is one of the alternatives in the energy conversion of the energy of motion into electrical energy. Turbocharger rotation will be used to turn a generator and converts the energy of motion into electrical energy.

Simulation of existing gas-fuelled conventional steam power plant using Cycle Tempo

Simulation of a 200 MW gas-fuelled conventional steam power plant located in Basra, Iraq was carried out. The thermodynamic performance of the considered power plant is estimated by a system simulation. A flow-sheet computer program, "Cycle-Tempo" is used for the study. The plant components and piping systems were considered and described in detail. The simulation results were verified against data gathered from the log sheet obtained from the station during its operation hours and good results were obtained. Operational factors like the stack exhaust temperature and excess air percentage were studied and discussed, as were environmental factors, such as ambient air temperature and water inlet temperature. In addition, detailed exergy losses were illustrated and describe the temperature profiles for the main plant components. The results prompted many suggestions for improvement of the plant performance.

Energy and exergy analysis of kalina cycle system (KCS) 34 with mass fraction ammonia-water mixture variation

Further utilization of waste heat produced by power plant system will increase the efficiency of the whole power plant system. The Kalina Cycle offers alternative solution to generate additional power from waste heat or from low temperature geothermal resources. The modeling application on energy system is used to study the basic design of thermal system, which uses Kalina Cycle for further utilization of geothermal brine water. If this geothermal brine water were not used in the Kalina Cycle, it would be reinjected to the geothermal reservoir and its remaining energy content would have been wasted. The study of this process is done by Cycle Tempo 5.0 simulation software, to obtain the data of efficiency, energy and exergy that could be generated from the heat source. An ammonia-water mixture is used as a working fluid on Kalina cycle system (KCS) 34. In order to obtain the maximum power output and maximum efficiency, the system will be optimized on the mass fraction of working fluid and also on the turbine output pressure. The result of the study shows that the maximum efficiency and power output are achieved at 78% ammonia-water mixture.

Techno-economic prospects for CO2 capture from a Solid Oxide Fuel Cell–Combined Heat and Power plant. Preliminary results

Abstract Potentially low-cost CO 2 capture may facilitate pre-commercial solid oxide fuel cell (SOFC) technology entering the energy market. The aim of this study was to compare and evaluate the techno-economic performance of CO 2 capture from industrial SOFC-Combined Heat and Power plant (CHP). CO 2 is captured by using oxyfuel afterburner and conventional air separation technologies. The results were compared to both SOFC-CHP plants without CO 2 capture and conventional gas engines CHP without CO 2 capture. The system modeling was performed using Cycle Tempo software. Our results show that while SOFC-CHP without CO 2 capture requires a low SOFC stack production cost of about 310$ /kW to compete with conventional GE-CHP, SOFC-CHP with CO 2 capture using large scale air separation unit can compete with GE-CHP at higher stack production costs when the CO 2 price is above 37 $ /t CO 2 . CO 2 avoidance cost of 50 $ /t CO 2 can be achieved at a stack production cost of 410 $ /kWe. The results indicate that CO 2 capture, even with commercially available technologies, can economically facilitate SOFC entering the energy market in a carbon-constrained society.