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

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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 protective gas, and then provide a kind of impurity removal effect and after purification. The tail gas recovery and purification process and device of the annealing furnace tail gas meet the requirements of the protective gas and can directly enter the annealing furnace for recycling

Method used

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

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Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment provides a process for recovering and purifying annealing furnace tail gas, including 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 for removal. At the same time, the emulsion, rolling oil and liquid water will also Wrap and remove part of the dust in the exhaust gas to collect the first exhaust gas;

[0046] (2) Carry out the first filtration treatment to the first tail gas, ensure that the filtration accuracy is 30 μm, remove the larger dust, and further remove the emulsion and rolling oil, and collect the second tail gas;

[0047] (3) Nitrogen is added to the second tail gas to obtain the third tail gas, and the gauge pressure of the third tail gas is guaranteed to be 1Kpa. On the one hand, it plays the role of buffering and stabilizing the pressure, so that the process pressure is stab...

Embodiment 2

[0053] This embodiment provides a process for recovering and purifying annealing furnace tail gas, including 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 the water vapor is condensed into liquid water for removal. At the same time, the emulsion, rolling oil and liquid water will also Wrap and remove part of the dust in the exhaust gas to collect the first exhaust gas;

[0055] (2) Carry out the first filtration treatment to the first tail gas, ensure that the filtration accuracy is 10 μm, remove the larger dust, and further remove the emulsion and rolling oil, and collect the second tail gas;

[0056] (3) Nitrogen is added to the second tail gas to obtain the third tail gas, and the gauge pressure of the third tail gas is guaranteed to be 2Kpa. On the one hand, it plays the role of buffering and stabilizing the pressure, so that the process pressure is sta...

Embodiment 3

[0062] This embodiment provides a process for recovering and purifying annealing furnace tail gas, including the following steps:

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

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

[0065] (3) Nitrogen is added to the second tail gas to obtain the third tail gas, and the gauge pressure of the third tail gas is guaranteed to be 0.5Kpa. On the one hand, it plays the role of buffering and stabilizing the pressure, so that the process pressure is ...

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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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