The operation analysis of a geothermal turbine with a capacity of 8 MW
Students Name: Tarnavskyi Yurii Olehovych
Qualification Level: magister
Speciality: Thermal Power Plants
Institute: Institute of Power Engineering and Control Systems
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Tarnavs?kyy Y.O., Kuzyk M.P. (supervisor). The operation analysis of a geothermal turbine with a capacity of 8 MW. Master’s thesis. – Lviv Polytechnic National University, Lviv, 2020. For commercialization of GeoTES on low-boiling working environments it is required to significantly reduce the cost of equipment, which can be achieved only by increasing the serial number, which in turn necessitates the unification of equipment. The first big step in this direction was made by Ormat, which developed a serial power module with a nominal capacity of 1.2 MW with a unified turbine and automation system. When the temperature of thermal water changes, the largest electricity generation is achieved by the selection of the working fluid and the use of cascade thermal schemes with stepwise operation of the thermal potential. The disadvantages of this approach are the lack of optimal working environments for each temperature range (15-20 °C) of thermal waters and the inevitable deterioration of the efficiency. turbines, the need to replace the generator and change the design of heat exchange equipment when replacing the working fluid and changing the temperature of thermal water. However, today only modular installations are used on an industrial scale. Together with high-temperature steam hydrothermal vents in the areas of modern volcanism, the reserves of which have already been largely mastered both technologically (standard drilling methods, steam turbines with a pressure of 5-7 atm) and in terms of industrial use (up to 50 - 70% of explored reserves in developed countries), there are large reserves of medium-temperature (100-200 °C) thermal waters, the development of which is just beginning. If the extraction of thermal water, as a rule, is not associated with technical difficulties, the effective conversion of thermal energy into electricity requires the creation of special thermomechanical equipment. Traditional steam installations are not suitable at such temperatures of the heat source due to the low density of steam and, accordingly, the unacceptably large dimensions of the turbine. In addition, almost the entire turbine and condenser must operate in a vacuum area, which causes significant corrosion of the equipment due to air suction. The object of research is a geothermal turbine with a capacity of 8 MW. The subject of research is the design and principle of operation of a geothermal turbine with a capacity of 8 MW. The purpose and objectives of research. The aim of the work is to analyze the operation of a geothermal turbine with a capacity of 8 MW. To achieve this goal it was necessary to perform the following tasks: - to analyze the possibility of commercialization of GeoTPP on low-boiling working environments; - justify the choice of the working fluid and thermal scheme of the geothermal turbine; - calculate the thermal scheme of the geothermal turbine; - to develop a geothermal turbine project. In this master’s qualification work, an analysis of the operation of a geothermal turbine with a capacity of 8 MW was performed. The choice of the working fluid, thermal scheme and calculation of the thermal scheme is substantiated, the geothermal turbine working on the low-boiling mixed working body - water-ammonia mix, with a power of 8 MW using thermal waters in a wide range of temperatures of 100-200 °C is developed. The economics section shows that due to the changes, the efficiency increased from 0.8 to 0.84, which led to a reduction in the cost of 1000 kW of energy produced in the amount of UAH 6. and the annual economic effect amounted to 322912 UAH. The description of control and measuring devices of the turbine unit, their purpose and automatic protection of the turbine, which prevent the development of accidents in the event of an emergency situation on the turbine unit. Automatic protection commands take precedence over all other automatic or manual control commands. Keywords: geothermal turbine, control and measuring devices, working body, thermal scheme, low-boiling mixed working environments.