Využití energie stlačeného zemního plynu v expanzní turbíně s předehřevem nad 150°C

Abstract

As part of my doctoral studies, I dealt with the possibility of using the pressure of compressed natural gas distributed by RWE Transgas, as for electricity generation. This research builds on bachelor and master's thesis. At present, gas pressure energy overwhelmingly obstructs throttles without further usage. Respectively, in rare instances, to reduce the pressure of gas utilizes expansion turbines with preheating to 120 °C. The dissertation deal with an increase in power expansion turbine feed gas preheat to a temperature above 150 °C with heat output expanded gas. To preheat the gas I use compressed gas to heat the recuperative heat exchanger. Reheat the gas to the desired temperature do I combusting natural gas. Boiler for hot gas will serve simultaneously as a heat source. This preheating, while maintaining the flow parameters of the gas, we get more power expansion turbine. During doctoral studies we protect this technology utility model No. 27275. The advantage of the production of electricity in the reduction of gas pressure the overall efficiency of transformation of primary fuel chemical energy into electricity with an efficiency of around 60% with the formation of the minimum waste heat. Due to the use recuperation exchanger which transforms heat expanded natural gas to the inlet gas, the overall efficiency of production of mechanical or electrical energy almost constant at various temperatures preheating above 150 °C. Recognising this, I used a second option, the regulation of electricity generation and, at constant electric power at normal flow of fluctuating gas reduction station. Due to the preheating temperatures up to 340 °C, may be used for preheating the gas and utilize waste heat or heat from less calorific fuels. The disadvantage of this pressure energy use for power generation is state legislation that does not allow a distributor of natural gas actually sell the electricity produced. The project pre seed CZ.1.05/3.1.00/14.0318 in cooperation with Mattech Ltd. Ostrava, was made by test-line microexpansion turbines, which are currently located in the premises of the Technical University of Ostrava. This line will serve to teach new students after minor modifications can be used to test new microexpansion turbines