Abstract
For many years, the Department of Power Engineering and Turbomachinery of the Silesian University of Technology has been using a small-capacity (about 500 kWe) steam-gas power plant. Based on many years of experience in operation of this power plant utilizing the Velox-type gas-steam system, an idea arose to modify this type of thermal power cycle to create a combined heat and power (CHP) plant of small capacity, dedicated for distributed heat and power production or production process steam with high temperature. Previous thermodynamic and economic analysis of that type of low-power CHP plant confirmed many advantages of using this type of solution in low-power engineering. The new idea is to add a throttle valve between the economizer and the evaporator for the reference cycle of the gas-steam Velox-type CHP plant. It was further assumed that water would partially be vaporized on the valve. This paper presents a thermodynamic and economic analysis of this type of a system with an added throttle valve. Downstream the valve, the evaporated water fraction is fed directly into the steam superheater. It is determined how such a retrofit affects the system thermodynamic and economic characteristics. The system is modelled in the EBSILON® Professional 14 software.
Highlights
The first power system using a gas-steam turbine combination was the one where a steam generator was incorporated into the gas turbine system to replace the classical combustion chamber
Considering the amount of generated steam, the Velox steam generator has a compact design and a relatively small heat transfer surface, especially in the evaporator. This is due to the fact that the heat exchange process in the combustion chamber takes place in overpressure, which intensifies the heat transfer between exhaust gases and water and steam in the tubes of the evaporator or steam superheaters
Using the experience gained so far from the operation of the Velox-type gas-steam system at the Department of Power Engineering and Turbomachinery of the Silesian University of Technology [4] and the technological progress which, among others, makes it possible to use materials enabling production of steam with much higher parameters than in the early days of this type of combined cycles, an idea originated to modify the system to create a lowpower combined heat and power (CHP) plant intended for distributed heat and electricity generation or production of high-temperature process steam
Summary
The first power system using a gas-steam turbine combination was the one where a steam generator was incorporated into the gas turbine system to replace the classical combustion chamber. The high velocity of exhaust gases in such a system enables effective utilization of the combustion chamber [1] The use of such combined systems in professional power engineering contributed to the. Using the experience gained so far from the operation of the Velox-type gas-steam system at the Department of Power Engineering and Turbomachinery of the Silesian University of Technology [4] and the technological progress which, among others, makes it possible to use materials enabling production of steam with much higher parameters than in the early days of this type of combined cycles, an idea originated to modify the system to create a lowpower combined heat and power (CHP) plant intended for distributed heat and electricity generation or production of high-temperature process steam. All the analyses presented are performed using the EBSILON® Professional 14 software
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