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Device and method for recovery and purification of nitrogen-hydrogen mixed tail gas for heat treatment of cold-rolled steel plates

A nitrogen-hydrogen mixed gas and nitrogen-hydrogen mixed technology is applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., and can solve the problems of large investment, high energy consumption in the production process, and high requirements for raw material pretreatment

Active Publication Date: 2019-05-31
DALIAN ZHONGDING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High requirements for raw material pretreatment, high energy consumption and large investment in the production process

Method used

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  • Device and method for recovery and purification of nitrogen-hydrogen mixed tail gas for heat treatment of cold-rolled steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) continuous annealing furnace tail gas

[0064] Epitaxy tail gas volume: 1500m 3 / h Temperature: 150°C Pressure: 0.03 atmospheres

[0065] Main composition: N 2 97.5%, H 2 2.4%, O 2 0.1%, the rest is a small amount of carbon dioxide, water, etc.

[0066] (2) Catalyst

[0067] Catalytic deoxidation CTC-1 noble metal catalyst (active component is palladium, carrier is alumina, active component accounts for 0.2% to 0.5% of the carrier component)

[0068] Noble metal catalyst use space velocity: 5000h -1

[0069] The total amount of precious catalyst loaded: 0.04m 3

[0070] Catalytic deoxidation tower aspect ratio: 5

[0071] (3) Process flow

[0072] Continuously anneal the exhaust gas (1500m 3 / h) (wherein the oxygen content is 0.1%) is passed into the water cooler for cooling, then pressurized by the first-stage booster fan, and then enters the water and dust collector and the front buffer tank. Then the mixed gas is boosted to 0.03Mpa ~ 0.05Mpa by the s...

Embodiment 2

[0076] (1) continuous annealing furnace tail gas

[0077] Exhaust gas volume: 2000m 3 / h Temperature: 150°C Pressure: 0.03 atmospheres

[0078] Main composition: N 2 97%, H 2 3%, O 2 ≤100ppm, the rest is a small amount of carbon dioxide, water, etc.

[0079] (2) Catalyst (same as in Example 1) noble metal catalyst using space velocity: 5000h -1

[0080] The total amount of precious catalyst loaded: 0.02m 3

[0081] Catalytic deoxidation tower aspect ratio: 6

[0082] (3) steps

[0083] Will exhaust exhaust (2000m 3 / h) (in which the oxygen content is less than or equal to 100ppm,) the exhaust gas of the continuous annealing furnace (1500m 3 / h) (wherein the oxygen content is 0.01%) is passed into the water cooler for cooling, then pressurized by the first-stage booster fan, and then enters the water and dust collector and the front buffer tank. Then the mixed gas is boosted to 0.03Mpa ~ 0.05Mpa by the secondary booster fan to provide the pressure for subsequent puri...

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Abstract

The invention provides a device and method for recycling and purifying nitrogen and hydrogen mixed tail gas in heat treatment of cold-roll steel sheets. According to components and impurities which are contained in the tail gas in heat treatment of the cold-roll steel sheets and the index requirement on nitrogen and hydrogen for heat treatment of the cold-roll steel sheets, a technical route comprising the steps of tail gas pretreatment, high pressure fan pressurization, catalytic deoxidation, water cooling, terminal purification, control over front-end pipeline pressure through mixed gas backflow and explosion-proof measure adoption is adopted. The method is particularly suitable for achieving recovery and purification and cyclic utilization of the nitrogen and hydrogen mixed tail gas in heat treatment of the cold-roll steel sheets and has good economic benefit and environmental protection benefit.

Description

technical field [0001] The invention belongs to the field of steel rolling production and application, and in particular relates to a method for recovering and preparing high-purity gas from the vented tail gas of a continuous steel rolling annealing furnace, that is, a device and method for recovering, purifying and recycling nitrogen-hydrogen mixed tail gas for heat treatment of cold-rolled steel plates. Background technique [0002] Nitrogen and hydrogen are chemical raw materials and new clean energy. In the metallurgical industry, nitrogen is a protective gas for continuous casting, continuous rolling, and steel annealing; combined nitrogen blowing on the top and bottom of converter steelmaking, sealing of converter steelmaking, blast furnace top Sealing, gas for pulverized coal injection in blast furnace ironmaking, etc.; in metal heat treatment, nitrogen-based atmosphere heat treatment with nitrogen odor as the basic component is a new technology and new technology for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/00B01D46/00
Inventor 乐韵高嵩于洋赵霖刘皖南王珅丛卫军邱长春
Owner DALIAN ZHONGDING CHEM