Nitrogen-hydrogen shielding gas separation system and method for steel rolling annealing furnace
A separation system and shielding gas technology, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of increasing the cost of the steel rolling process, energy waste, etc., and achieve improved utilization, reduced costs, and simple process control Effect
Pending Publication Date: 2020-08-28
WISDRI ENG & RES INC LTD
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Problems solved by technology
[0003] The purpose of the present invention is to overcome the problem that the nitrogen-hydrogen protective gas discharged from the existing continuous annealing furnace is directly ignited and released, causing energy waste and increasing the cost of the steel rolling process
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[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0025] In describing the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than in...
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The invention provides a nitrogen-hydrogen shielding gas separation system and method for a steel rolling annealing furnace. The system comprises a continuous annealing furnace, a cooler, a diffusionchimney, a catalytic deaerator, an adsorption regeneration type drying device and a membrane separator. A shielding gas exhaust port of the continuous annealing furnace is respectively connected withthe cooler and the diffusion chimney through branch pipelines, control valves are arranged on the branch pipelines, a gas outlet of the cooler is connected with a gas inlet of the catalytic deaerator,a gas outlet of the catalytic deaerator is connected with a gas inlet of the adsorption regeneration type drying device, a gas outlet of the adsorption regeneration type drying device is connected with a gas inlet of the membrane separator, and a hollow fiber polysulfone composite membrane is arranged in the membrane separator. After the nitrogen-hydrogen shielding gas is subjected to cooling, deoxidizing and drying treatment, the nitrogen-hydrogen shielding gas is subjected to nitrogen-hydrogen separation through a membrane separation technology, and the obtained hydrogen-rich mixed gas canbe recycled, so that the shielding gas is prevented from being directly ignited and diffused, energy sources are greatly saved, the steel rolling process cost is reduced, and energy conservation and emission reduction of an iron and steel plant are promoted.
Description
technical field [0001] The invention belongs to the technical field of recovery and utilization of nitrogen-hydrogen protective gas for steel rolling annealing furnaces, and in particular relates to a nitrogen-hydrogen protective gas separation system and method for steel rolling annealing furnaces. Background technique [0002] During the annealing process of the cold-rolled steel sheet in the continuous annealing furnace, a mixed gas of nitrogen and hydrogen is used as a protective gas to maintain a slight positive pressure and a reducing atmosphere in the continuous annealing furnace, so as to prevent the steel sheet from being oxidized by air at high temperature, and can Adjust steel properties. Hydrogen is an important secondary energy source. Since the nitrogen-hydrogen mixture usually has a low hydrogen content (usually 3-5%), the nitrogen-hydrogen protective gas is usually not recycled after use, but is ignited and released through the release chimney, which not only...
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IPC IPC(8): B01D53/86B01D53/46C21D1/26C21D1/74C21D9/00B01D53/26B01D53/22
CPCB01D53/261B01D53/22B01D53/86B01D53/46C21D1/74C21D1/26C21D9/00B01D2257/104
Inventor 施万玲吴炳成汪学军夏朝晖
Owner WISDRI ENG & RES INC LTD