Continuous exhaust unit flue gas system

Abstract

The invention provides a flue gas system for a continuous annealing unit. The flue gas system comprises a heat pipe waste heat recovery device, a water supply system, a flue gas pipeline and an induced draft fan, wherein one end of the flue gas pipeline is connected with an exhaust port of the continuous annealing unit, the other end of the flue gas pipeline is connected with the induced draft fan which is connected with a chimney, the heat pipe waste heat recovery device is arranged in the flue gas pipeline, and the water supply system is connected with the heat pipe waste heat recovery device which provides low-pressure steam for a factory. According to the flue gas system for the continuous annealing unit, sensible heat in flue gas of the continuous annealing unit can be converted into the low-pressure steam to be used by units of the factory under the condition that an original combustion control mode is unchanged, usage of external steam can be reduced, and energy saving and emission reduction can be achieved.

Description

technical field [0001] The invention relates to a flue gas waste heat recovery system, in particular to a flue gas system of a continuous aeration unit. Background technique [0002] In the prior art, the heating section of the general continuous cooling unit is divided into 8 heating zones, and the flue gas is divided into two independent flues (that is, 4 zones and 1 flue gas channel) to be discharged through the chimney of the induced draft fan. The heating zone adopts the radiant heating method, that is, the gas burns in the radiant tube, and the steel strip is heated through the radiant tube. The general flue gas discharge temperature is between 400°C and 700°C. Because this heating method has negative pressure on the combustion in the radiant tube The control requirements are extremely high, so the flue gas exhausted by general heating furnaces has not been recovered for waste heat. [0003] figure 1 It is a structural schematic diagram of the flue gas system of the ...

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Problems solved by technology

[0004] The main disadvantages of the above-mentioned existing flue gas system of the continuous cooling unit are as follows: the sensible heat in the exhaust flue gas is not used, and a large amount of waste heat resources are wasted; At 400°C, a certain amount of cold air needs to be added to ensure the stable, safe and reliable operation of the induced draft fan 1'. This situation will increase the output of the fan and cause power waste

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