IRRIGATION-CONDENSATION TYPE FLUE GAS HEAT RECOVERY UNIT WITH IRRIGATION WATER HEATING Russian patent published in 2024 - IPC F22B1/18 

FIELD: heat power engineering.

SUBSTANCE: invention relates to heat engineering and can be used, in particular, for utilization of flue gas heat at thermal power plants (TPP) operating boiler plants. Installation for utilization of heat of flue gases contains the main gas duct, to which a bypass gas duct is connected, on the line of which there are installed in series along the gas flow: first shutoff and control device, smoke exhauster, gas-water surface heat exchanger, louvre separator and second shutoff and control device. Plant also includes a feed water pipeline, on the line of which the first pump is installed. Outlet of the feed water pipeline is connected to the inlet of the first header of the gas-water surface heat exchanger, the outlet of which is connected to the inlets of the tubes of the gas-water surface heat exchanger in the counterflow to the gas flow. At that, outlets of tubes of gas-water surface heat exchanger are connected to inlet of the second header of gas-water surface heat exchanger, the outlet of which is connected to inlet of discharge pipeline, the outlet of which is connected to make-up tank of heat network. Condensate collector of the gas-water surface heat exchanger is connected to a condensate discharge pipeline, on the line of which there are installed in series along the condensate flow: a hydraulic lock, a second pump and a three-way valve. Three-way valve is connected to the inlet of the condensate drain pipeline and to the inlet of the first irrigation system pipeline, on the line of which a water flow meter is installed. Three-way valve and the water flow meter are connected to the controller. At the same time on the line of the main gas duct between the inlet and outlet of the bypass gas duct there is a surface heat exchanger for reheating of irrigation water. Outlet of the first pipeline of the irrigation system is connected to the inlet of the first header of the surface heat exchanger of irrigation water reheating, the outlet of which is connected to the inlets of the tubes of the surface heat exchanger of the irrigation water reheating in the opposite direction to the gas flow. At that, the irrigation water reheating surface heat exchanger tubes outlets are connected to the irrigation water reheating surface heat exchanger second header inlet, the outlet of which is connected to the irrigation system second pipeline inlet, the outlet of which is connected to a sprinkler installed inside the housing of the gas-water surface heat exchanger above its tubes. At the same time the louvre separator tube for condensate drain is connected to the condensate discharge pipeline.

EFFECT: reduction of probability of occurrence of corrosion and erosion damages of smoke exhauster impeller, reduction of probability of occurrence of erosion and corrosion damages of outlet part of bypass gas duct and improvement of efficiency of utilization of heat of flue gases.

2 cl, 1 dwg