FLUE GAS HEAT RECOVERY UNIT Russian patent published in 2022 - IPC F22B1/18 

FIELD: heat power industry.

SUBSTANCE: invention can be used, in particular, for the utilization of heat from flue gases at thermal power plants (TPP) that utilize boiler systems. Flue gas heat recovery plant contains the main gas duct to which the first bypass flue is connected; the first shut-off and regulating device, the first stage of the gas-to-water surface heat exchanger, the second stage of the gas-to-water surface heat exchanger, exhaust fan and the second shut-off and regulating device are installed on the line of the duct in succession along the gas flow. The plant also contains a second bypass gas duct the inlet of which is connected to the first bypass gas duct between the first shut-off and regulating device and the first stage of the gas-to-water surface heat exchanger, and the outlet of the duct is connected to the first bypass gas duct between the second stage of the gas-to-water surface heat exchanger and the exhaust fan. Moreover, the third shut-off and regulating device is installed on the line of the second bypass gas duct; the device is connected to a resistance thermometer installed on the line of the first bypass gas duct between the second stage of the gas-to-water surface heat exchanger and the outlet of the second bypass gas duct. The plant also contains a make-up water pipeline on the line of which a pump is installed. Moreover, the outlet of the make-up water pipeline is connected to the inlet of the first discharge pipeline, on the lines of which the second stage of the gas-to-water surface heat exchanger and the first stage of the gas-to-water surface heat exchanger are installed in succession along the water flow. At the same time, the outlet of the first discharge pipeline is connected to the first inlet of the heating network feed tank. Moreover, the outlet of the make-up water pipeline is also connected to the inlet of the second discharge pipeline on the line of which at least one heat exchanger for heating water is installed. The outlet of the second discharge pipeline is connected to the second inlet of the heating network feed tank. Moreover, a hot well of the second stage of the gas-to-water surface heat exchanger is connected to the condensate pipeline.

EFFECT: automatic regulation of the flow of flue gases discharged from the main gas duct and supplied to the make-up water heating to reduce the likelihood of condensate in the first bypass gas duct in front of the exhauster, main gas duct and smoke stack, ensuring the separation of moisture from the flue gases discharged from the main gas flue.

1 cl, 1 dwg