Process for recovering and purifying annealing furnace exhaust gas and device thereof

A tail gas recovery and annealing furnace technology, which is applied to the improvement of process efficiency, furnaces, manufacturing tools, etc., can solve the problems that the tail gas cannot meet the protection gas requirements and the impurity removal effect is poor, so as to improve the impurity removal effect, good dust removal effect, The effect of reducing the difficulty of impurity removal

Pending Publication Date: 2017-06-13
LANGFANG GUANGHUI GAS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, what the present invention aims to solve is that the existing annealing furnace tail gas recovery and purification process and its device have the defects of poor impurity removal effect and the purified tail gas is difficult to meet the requirements of prot

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  • Process for recovering and purifying annealing furnace exhaust gas and device thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0043] Example 1

[0044] This embodiment provides a process for recycling and purifying tail gas from an annealing furnace, which includes the following steps:

[0045] (1) Condensate the tail gas of the annealing furnace at 10°C, so that the emulsion and rolling oil are condensed into large particles, and the water vapor is condensed into liquid water to be removed. At the same time, the emulsion, rolling oil and liquid water will also be removed. Wrap and remove part of the dust in the exhaust gas, and collect the first exhaust gas;

[0046] (2) Perform the first filtration treatment on the first exhaust gas to ensure the filtration accuracy of 30μm, remove the larger dust, and further remove the emulsion and rolling oil, and collect the second exhaust gas;

[0047] (3) Add nitrogen to the second exhaust gas to obtain the third exhaust gas to ensure that the gauge pressure of the third exhaust gas is 1Kpa. On the one hand, it plays the role of buffering and stabilizing, so that the...

Example Embodiment

[0052] Example 2

[0053] This embodiment provides a process for recycling and purifying tail gas from an annealing furnace, which includes the following steps:

[0054] (1) Condensate the tail gas of the annealing furnace at 3°C, so that the emulsion and rolling oil are condensed into large particles, and water vapor is condensed into liquid water to be removed. At the same time, the emulsion, rolling oil and liquid water will also be removed. Wrap and remove part of the dust in the exhaust gas, and collect the first exhaust gas;

[0055] (2) Perform the first filtration treatment on the first exhaust gas to ensure the filtration accuracy of 10 μm, remove the larger dust, and further remove the emulsion and rolling oil, and collect the second exhaust gas;

[0056] (3) Add nitrogen to the second exhaust gas to obtain the third exhaust gas to ensure that the gauge pressure of the third exhaust gas is 2Kpa. On the one hand, it plays a role of buffering and stabilizing, so that the proce...

Example Embodiment

[0061] Example 3

[0062] This embodiment provides a process for recycling and purifying tail gas from an annealing furnace, which includes the following steps:

[0063] (1) Condensate the exhaust gas of the annealing furnace at 16°C, so that the emulsion and rolling oil are condensed into large particles, and water vapor is condensed into liquid water to be removed. At the same time, the emulsion, rolling oil and liquid water will also be removed. Wrap and remove part of the dust in the exhaust gas, and collect the first exhaust gas;

[0064] (2) Perform the first filtration treatment on the first exhaust gas to ensure that the filtration accuracy is 50μm, remove the larger dust, and further remove the emulsion and rolling oil, and collect the second exhaust gas;

[0065] (3) Add nitrogen to the second exhaust gas to obtain the third exhaust gas to ensure that the gauge pressure of the third exhaust gas is 0.5Kpa. On the one hand, it plays the role of buffering and stabilizing, so th...

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Abstract

The invention discloses a process for recovering and purifying annealing furnace exhaust gas and a device thereof. The process comprises the following steps: (1) carrying out condensation treatment of the annealing furnace exhaust gas, and collecting first exhaust gas; (2) carrying out first filtration treatment of the first exhaust gas, and collecting second exhaust gas; (3) supplementing nitrogen gas to the second exhaust gas, to obtain third exhaust gas; (4) carrying out second filtration treatment of the third exhaust gas, and collecting fourth exhaust gas; (5) successively carrying out heat treatment and deoxidation treatment of the fourth exhaust gas, and collecting fifth exhaust gas; and (6) carrying out adsorption treatment of the fifth exhaust gas, and collecting purified gas. Through the process and the supporting device, dust, emulsions, rolling oil, oxygen gas and other impurities in the annealing furnace exhaust gas can be effectively removed, the final purified gas meets protection gas requirements and can directly enter an annealing furnace for recycling, and the process and the device thereof have remarkable economic benefits and social environmental-protection benefits.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a process and a device for recovering and purifying tail gas from an annealing furnace, in particular to a process and a device for recovering, purifying and recycling the tail gas of a continuous annealing furnace for strip steel. Background technique [0002] At present, the protective gas used in the domestic continuous annealing furnace is a mixed gas of hydrogen and nitrogen, and its consumption in the working process is not large, but in order to ensure the slight positive pressure in the furnace, the protective gas must be continuously introduced to ensure the safety of the equipment Operation, while preventing air from entering the furnace and causing product quality defects. In the protective gas currently used, the proportion of hydrogen is 5-8%, and that of nitrogen is 92-95%. The protective gas with this ratio can effectively protect and reduce ...

Claims

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Application Information

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IPC IPC(8): B01D53/00B01D53/02B01D46/00B01D5/00C21D1/26C21D1/74C21D9/00
CPCB01D5/0057B01D5/0072B01D46/0012B01D53/00B01D53/002B01D53/005B01D53/02C21D1/26C21D1/74C21D9/0006B01D2257/104B01D2258/02Y02P10/20
Inventor 张磊李宝树张艺宁
Owner LANGFANG GUANGHUI GAS EQUIP
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