Cooling air supply device for cold-strip steel continuous annealing furnace

Abstract

The invention provides a cooling air supply device for a cold-strip steel continuous annealing furnace. The cooling air supply device for the cold-strip steel continuous annealing furnace comprises a water cooled heat exchanger, and a circulating fan, wherein the outlet of the water cooled heat exchanger is connected with the inlet of the circulating fan through a front pipeline of the circulating fan; the outlet of the circulating fan is connected with a blowing cooling bellow inside the annealing furnace body through a high-hydrogen protective gas injection pipeline; the inlet of the water-cooled heat exchanger is connected with an exhaust port of the annealing furnace body through a protective gas extracting pipeline; a negative pressure-proof pipeline is arranged between the outlet and the inlet of the circulating fan; and the flow direction of the gas in the negative pressure-proof pipeline is the direction from the outlet of the circulating fan to the inlet of the circulating fan. By using the device, leakage of high-hydrogen concentration gas is reduced to the maximal extent by matching with a few of detecting instruments; energy consumption is reduced; expenses are saved; the operational safety of personnel around a circulating air duct is ensured; the chance that the air enters inside the air duct is reduced; and the security of high-hydrogen gas inside the circulating air duct is increased.

Description

technical field [0001] The invention belongs to the technical field of continuous annealing furnaces for cold-rolled strip steel, and in particular relates to a cooling air supply device for the continuous annealing furnace for cold-rolled strip steel. Background technique [0002] In the cold-rolled strip annealing furnace, in order to obtain a higher cooling rate, nitrogen-hydrogen protective gas with high hydrogen content is used for spray cooling in the fast cooling section, especially in large vertical annealing furnaces, the strip speed is fast, In order to achieve the cooling rate, the hydrogen concentration in the protective gas in the fast cooling section of some annealing furnaces reaches 50%. While the concentration of hydrogen gas is increasing, it brings the requirements for the airtightness and leakage prevention of the circulating air duct. On the one hand, it is necessary to minimize the leakage of high hydrogen protective gas to reduce the consumption of hyd...

AI Technical Summary

Problems solved by technology

However, the reliability of instruments has certain risks in different occasions and times. How to improve the air duct structure to reduce leakage points or increase leakage safety measures to reduce the dependence on instruments puts forward higher requirements for design considerations

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