Utilization and conversion of unclaimed thermal energy in heat supply systems of district boiler
Currently, there is an active tendency to use the combined power plants generate heat and electricity, especially in areas that are not within range of the large thermal power plants. Heat Supply organizations operating district heating plants are often beneficial to sacrifice a certain amount of heat, and in consequence of this natural gas as the main fuel for the benefit of generating electricity for their own consumption. For the production of electricity on heat supply source most widely using schemes with gas piston (HCP) and gas turbine (GT) units. The cogeneration unit provides electricity. The task of generating heat more efficiently can give a modem gas boiler, having efficiency at the level of 89-92 %. Using the gas piston unit and the gas turbine unit entails the removal of heat for their efficient operation. This heat is advisable to convert to electricity. For the utilization of unclaimed heat actively apply units operating on organic Rankine cycle (ORC). These units can dispose the thermal energy of the different heat transfer fluids, so they are compatible with a wide range of main power equipment. For existing boiler plant in Kazan was proposed scheme for utilization of heat of exhaust flue gases and the cooling system of the gas piston unit with using a ORC-installation. To evaluate the efficiency of the boiler room together with the installation was proposed the mathematical definition of dependence energetic efficiency of the scheme. Results showed that with the use of CRO-installation of such boilers is possible to increase his efficiency by up of 9,7 %.