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Tail gas recovery process and device for protective gas in hot-dip galvanizing production line

A tail gas recovery and production line technology, applied in hot dip plating process, metal material coating process, coating and other directions, can solve the problems of unstable protective gas pressure, pollute the environment, low resource utilization rate, etc., and solve the problem of resource utilization rate Low environmental pollution, cost saving, and the effect of solving pressure instability

Active Publication Date: 2017-08-08
LANGFANG GUANGHUI GAS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the defects of low resource utilization and environmental pollution existing in the hot-dip galvanizing production line in the prior art, and further provide an energy-saving and environment-friendly tail gas recovery process and device for the protective gas of the hot-dip galvanizing production line
[0005] Another technical problem solved by the present invention is to overcome the defect of unstable shielding gas pressure in the hot-dip galvanizing production line in the prior art, and then provide a kind of tail gas that can ensure the good stability of the whole production line. Recovery process and device

Method used

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  • Tail gas recovery process and device for protective gas in hot-dip galvanizing production line
  • Tail gas recovery process and device for protective gas in hot-dip galvanizing production line

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The tail gas recovery process of the protective gas of the hot-dip galvanizing production line described in this embodiment, such as figure 1 shown, including the following steps:

[0054] (1) The relative pressure of the tail gas of the protective gas of the hot-dip galvanizing production line is adjusted to 1k Pa;

[0055] (2) the tail gas after step (1) pressure regulation is sent into the cyclone separator with a speed of 10 m / s to carry out gas-solid separation, and collect the gas phase;

[0056] (3) cooling the gas phase obtained in step (2) to 30°C;

[0057] (4) step (3) gas phase after cooling is carried out boosting treatment;

[0058] (5) At 120°C, the volumetric space velocity is 5000h -1 Under the condition that adopts palladium catalyst deoxidizer to carry out deoxidation treatment to the gas phase after step (4) boosting;

[0059] (6) Using molecular sieve as desiccant, at 10°C, volumetric space velocity is 1000h -1 The gas phase after step (5) deoxi...

Embodiment 2

[0062] The tail gas recovery process of the protective gas of the hot-dip galvanizing production line described in this embodiment, such as figure 1 shown, including the following steps:

[0063] (1) Adjust the relative pressure of the tail gas of the protective gas of the hot-dip galvanizing production line to 0.01k Pa;

[0064] (2) the tail gas after the step (1) pressure regulation is sent into the cyclone separator with a speed of 20 m / s to carry out gas-solid separation, and collect the gas phase;

[0065] (3) The gas phase obtained in step (2) is cooled to 20° C., and then the cooled gas phase is further cooled to 8.5° C. to completely remove solid matter and saturated water vapor in the gas phase; Hydrogen is mixed until the volume content of hydrogen in the mixed gas is 20%;

[0066] (4) pressurizing the mixed gas in step (3);

[0067] (5) At 80°C, the volumetric space velocity is 5000h -1 Under the condition that adopts palladium catalyst deoxidizer to carry out d...

Embodiment 3

[0071] The tail gas recovery process of the protective gas of the hot-dip galvanizing production line described in this embodiment, such as figure 1 shown, including the following steps:

[0072] (1) Adjust the relative pressure of the tail gas of the protective gas of the hot-dip galvanizing production line to 0.5k Pa;

[0073] (2) the tail gas after step (1) pressure regulation is sent in the cyclone separator with the speed of 30 m / s and carries out gas-solid separation, collects gas phase;

[0074] (3) cooling the gas phase obtained in step (2) to 10°C;

[0075] (4) step (3) gas phase after cooling is carried out boosting treatment;

[0076] (5) Heating the gas phase after step (4) to 90°C, and then at 100°C, the volume space velocity is 5000h -1 Under certain conditions, the heated gas phase is deoxidized using a palladium catalyst deoxidizer, and the temperature of the deoxidized gas phase is lowered to 35°C;

[0077] (6) Using molecular sieve as desiccant, at 22°C, ...

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Abstract

The invention provides a tail gas recovery process and device for hot galvanizing production line protection gas. The process includes the steps that gas-solid separation, cooling dehydration, pressure boosting, deoxygenation and drying are sequentially conducted on tail gases under the condition that the pressure of a tail gas outlet is controlled to be slightly higher than atmospheric pressure, so that tail gas recovery and purification are achieved; and then an obtained product gas is sent to a hot galvanizing production line for recycling. In this way, the demand quantity of liquid ammonia and the demanded electricity for ammonia decomposition on the hot galvanizing production line are greatly lowered. The process has the advantages of saving energy and being friendly to the environment. According to the process, a large pressure difference is formed between a protection gas inlet and the tail gas outlet, so that continuous and stable pressure is provided for the whole hot galvanizing production line; and the stability of the hot galvanizing production line is improved. All components of the device are conventional devices in the prior art and can be directly assembled for use. The device has the advantages of being simple in structure, convenient to install and low in energy consumption.

Description

technical field [0001] The invention relates to the field of galvanizing production, in particular to a tail gas recovery process and device for protective gas in a hot-dip galvanizing production line. Background technique [0002] Hot-dip galvanizing, also known as hot-dip galvanizing or hot-dip galvanizing, is an effective metal anti-corrosion method, and it is also the most widely used steel surface treatment method with the best performance-price ratio in the world today. Hot-dip galvanizing technology plays an inestimable and irreplaceable role in corrosion reduction, life extension, energy saving and material saving of steel, making hot-dip galvanized steel widely used in transmission line towers, communication towers, municipal lighting, electrified railways, transportation, shipbuilding, construction and other industries Has a very wide range of applications. According to statistics, 40% of the world's annual zinc production is used for hot-dip galvanizing, and hot-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/26
CPCC23C2/06C23C2/26
Inventor 张磊
Owner LANGFANG GUANGHUI GAS EQUIP
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