SU1760238A1 - Boiler plant - Google Patents

Abstract

Use: in boiler installations to reduce low temperature corrosion. SUMMARY OF THE INVENTION: The flue gases leaving the boiler unit 1 are directed to the gas duct 3, where heat is transferred in the heat exchanger 5, the heated path of which is connected by the inlet to the exit duct section, in contact heat exchange with the liquid supplied through the sprinkler 16, and in the air heater 7, after which are fed into the heat exchanger 5, are dried up and the smoke exhauster 9 is fed into the chimney 10. 1 sludge.

Description

The invention relates to a power system and can be used to protect chimneys from corrosion.

A boiler installation is known, which includes a boiler unit connected by a duct to a chimney, heat exchangers 1 installed in the duct.

In this design, the gases leaving the chimney are not dried at the exit of the flue duct, which does not exclude the possibility of low-temperature corrosion in the chimney.

Also known boiler installation, including the duct connected to the chimney, heat exchangers located in the duct, and the heated path located and the duct surface heat exchanger connected to the outlet of the chimney, and the output connected to an additional pipe to the outlet section of the duct 2. Located in the duct surface heat exchanger installed between contact and liquid heat exchangers.

The known design significantly reduces the amount of moisture entering the chimney; however, the location of the surface heat exchanger after the contact heat exchanger reduces the temperature difference on the surface heat exchanger and, therefore, leads to a decrease in the temperature of the gases entering the chimney. In addition, the location of the exhaust fan in the zone, wet flue gases leads to a decrease in its reliability.

The aim of the invention is to increase reliability by reducing the low temperature corrosion of the flue pipe.

The goal is achieved by those. that the surface heat exchanger is installed in front of the sprinkler, and the exhaust fan is after the above-mentioned heat exchanger.

The drawing shows schematically the boiler plant. It contains a regatta 1 boiler with a combustion device 2. a duct 3 with a pallet 4. In the duct 3, surface heat exchange is successively arranged00

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nick 6 and the air heater 7. The inlet of the surface heat exchanger 5 is connected via pipe 8 to the outlet section of the gas duct 3. And the output through the exhaust fan 9 is connected to the chimney 10 1 and chimney 10. The control unit 15 for the gates 13 and 14 is connected to an automation system (not shown) of the combustion device 2. A sprinkler 16 is installed above the gas heat exchanger 5, equipped with a liquid recirculation system, including second pump 17, the pallet 4 and the conduit 18.

The installation works as follows.

The flue gases leaving the boiler unit 1 are sent to the duct 3, where heat is transferred to the flue gases passing through the heated path of the surface heat exchanger 5. Then the flue gases give heat to the contact utilization heat exchanger 6 and the air preheater 7, on the surface of which also condenses moisture containing in flue gas

Dipee flue gases through the pipeline 8 are fed into the gas heat exchanger 5, are dried and the smoke exhauster 9 is fed into the chimney 10.

The outside air is drained and heated in the air preheater 7 and

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pipelines 11 and 12 are directed to the combustion device 2 and into the chimney 10. Depending on the mode of operation of the boiler plant, the amount of air supplied

through the air heater 7 into the combustion device 2 and into the chimney 10, it is controlled by the gates 13 and 14, controlled from the automatic combustion system through the control unit 15.

0 Since the flue gases go down the chimney

dried as much as possible in the heat exchanger 5. then the supply of dry outside air into the chimney significantly reduces the possibility of moisture condensation

5 on the walls of the chimney. The location of the exhauster at the outlet of the surface heat exchanger increases the reliability of its operation, since during operation of the dry flue gases, the conditions of the exhauster operation are significantly improved.

Claims (1)

Claims of the Invention A boiler plant comprising a sprinkler disposed in the duct and a top heat exchanger, the heated path of which is connected by its inlet to the outlet section of the duct and the outlet with a chimney and an exhaust fan. 0 by reducing the low-temperature corrosion, the surface heat exchanger is installed in front of the sprinkler, and the exhaust fan is installed after the mentioned heat exchanger along the gas flow.