Abstract
The chapter presents an innovative technical solution for the use of low-temperature excess heat from the combined heat and power (CHP) of gas engines using gas or liquid fuel for district heating, building heating or industry. The primary fuel efficiency of CHP gas engines for heat production can be significantly increased by using the low-temperature excess heat of the exhaust gasses and the cooling system of the CHP gas engine, which are released into the environment thereby also reducing CO2 emissions. District heating hot water systems generally work with higher temperatures of the heating water, which is transported to the heat consumer via the supply line, and the cooled heating water is returned to the CHP gas engine via the return line. In order to make use of the excess low-temperature heat of the exhaust gasses and the cooling system of the CHP gas engine, a condenser must be installed in the exhaust pipe in which the water vapor contained in the exhaust gasses condenses and a mixture of water and glycol is heated, which later leads to the evaporator of the high-temperature heat pump (HTHP). The cooled heating water is returned from the heat consumer via the district heating return pipe to a condenser of one or more HTHPs connected in series, where it is reheated and then sent to a CHP gas engine, where it is reheated to the final temperature. The Aspen plus software package is used to run a computer simulation of one or more HTHPs connected in series and parallel to the district heating system and to demonstrate the economics of using the excess heat from the exhaust gasses and the cooling system of the CHP gas engine.
Highlights
More efficient energy consumption, and reduced consumption of nonrenewable energy sources, can significantly reduce energy costs, mitigate climate change, improve the quality of life and reduce the EU’s dependence on imported oil and gas
High-temperature heat pumps use the excess heat of the exhaust gasses and the heat of the cooling system of the combined heat and power (CHP) gas engine and heat the return water of the district heating system
In order to use the excess heat of the exhaust gasses and the cooling system of the CHP gas engine, it is necessary to install a heat exchanger in the exhaust system, where they are further cooled by cooling and condensation of the water contained in the exhaust gasses
Summary
Reduced consumption of nonrenewable energy sources, can significantly reduce energy costs, mitigate climate change, improve the quality of life and reduce the EU’s dependence on imported oil and gas. In 2007, the EU set three main targets: a 20% reduction in greenhouse gas emissions (compared to 1990 levels), 20% of energy consumption from renewable sources in the EU and a 20% improvement in energy efficiency. Increasing the efficiency of new or existing heat generation plants is one of the priorities in line with the EU’s commitments to reduce GHG (greenhouse gases) emissions and achieve several environmental goals [1]. The objectives for the use of surplus low temperature energy sources in CHP gas engines are:. To implement a new l solution for the use of surplus low-temperature heat sources generated by the operation of CHP gas engines,. The need to use the excess low-temperature heat from CHP plants to increase the efficiency of the primary fuel,. Surplus low-temperature energy sources from CHP gas engines are used by high-temperature heat pumps to heat the return pipe water,. The requirement to comply with EU recommendations and requirements concerning energy efficiency and environmental protection
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