Improving energy efficiency the trigenerational cycle

The relevance of the study is due to the low efficiency of using the heat of combustion of fuel in modern industrial, energy and heating installations.

This article is aimed at improving energy efficiency in the design of trinegeration installations, as well as improving existing trigeneration systems.

The existing installation has a highly efficient approach in the energy sector, which is aimed at the one-time production of electricity, heat and cold from a local centralized location. A popular technological solution for creating trigeneration systems is a combination of gas-piston power plants and absorption chillers, in which the energy of the exhaust gases is used to generate cold.

In this regard, this article is aimed at revealing the possibilities of using the heat of the exhaust gases of the cogeneration plant, including the latent heat of the formation of water vapor contained in the flue gases.

In this study, the key component is the method of utilization of hot exhaust gases of a gas turbine system, which in turn consists in the transfer of heat from hot gases through a steam compression heat pump that provides regenerative heat exchange.

The temperature of the hot gases that come out of the gas turbine can be about 450oC, and these gases usually contain a sufficient amount of heat, which makes heat recovery economically feasible. As a rule, the output gases are fed into an indirect contact heat exchanger containing water that evaporates. The resulting water vapor is fed to a steam turbine connected to a generator that produces electricity, and the expanded steam exits the turbine. The expanded steam condenses in a condenser, which is usually supplied with cooling water from a reservoir connected, for example, with a grate.

During cold weather, the air temperature may fall below the freezing point of the water, leading to freezing of the cooling water and steam condensate, thus preventing the operation of the condenser and cooling tower. When this happens, the operation of the heat recovery cycle should stop.

The main approach to solving this problem is the utilization of the heat of the exhaust gases of the co-generation plant using a steam compressor heat pump, which in turn increases the energy efficiency of the trigeneration of the cogeneration plant by reducing exergetic losses. To analyze the effectiveness of the cycle, the method of exergetic analysis was used.

The materials of the article are of practical value for designers of integrated heat supply systems.

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