Flue gas waste heat utilization system for annealing furnace

Abstract

The invention discloses a flue gas waste heat utilization system for an annealing furnace. The flue gas waste heat utilization system for the annealing furnace comprises the annealing furnace, a heat exchanger connected with the annealing furnace, a flue and a discharge chimney, wherein an intake part with a dust removal function is arranged on the heat exchanger; a cooling furnace is arranged between the chimney and the heat exchanger; a water jet pump is connected above the cooling furnace; the water jet pump is connected with a water tank; a cooling water cooling device is connected below the cooling furnace; a filter device is arranged between the cooling furnace and the cooling water cooling device; a water suction pump is further connected to the cooling water cooling device; and the water suction pump is used for inputting water cooled in the cooling water cooling device into the water tank. Compared with the prior art, the flue gas waste heat utilization system for the annealing furnace, which is disclosed by the invention, is capable of effectively lowering a flue gas exhaust temperature of the annealing furnace, improving a recycling effect for flue gas heat energy, and removing dust and other impurities in a flue gas, thus preventing environmental pollution.

Description

technical field [0001] The invention relates to a flue gas waste heat recovery system, in particular to an annealing furnace flue gas waste heat recovery system. Background technique [0002] With the advancement of social progress and the advancement of energy conservation and emission reduction policies, various waste heat recovery equipment and systems have been continuously applied to effective energy-saving means. Although the annealing furnace flue gas waste heat recovery system has gradually matured and has been widely used It is used in actual production; and because the flue gas of the annealing furnace passes through the heat exchanger for one heat exchange, the temperature of the combustion exhaust gas of the annealing furnace has dropped to about 350°C. Due to the low temperature of the flue gas, the current part of the flue gas Most of the treatment methods are: or directly discharge, which will lead to a serious waste of heat energy; or mix a certain proportion...

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Problems solved by technology

[0002] With the advancement of social progress and the advancement of energy conservation and emission reduction policies, various waste heat recovery equipment and systems have been continuously applied to effective energy-saving means. Although the annealing furnace flue gas waste heat recovery system has gradually matured and has been widely used It is used in actual production; and because the flue gas of the annealing furnace passes through the heat exchanger for one heat exchange, the temperature of the combustion exhaust gas of the annealing furnace has dropped to about 350°C. Due to the low temperature of the flue gas, the current part of the flue gas Most of the treatment methods are: or directly discharge, which will lead to a serious waste of heat energy; or mix a certain proportion of air in the flue gas, reduce its temperature to about 250 ℃ and discharge, and there is also a lot of waste in this way. The thermal energy of the flue gas increases the problem of the load of the induced draft fan.

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