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Fluorine-containing exhaust gas treatment device and method

A waste gas treatment device and technology for waste gas treatment, which are applied in chemical instruments and methods, separation methods, dispersed particle separation, etc. The effect of reducing calcium content, reducing long-term operating costs, and improving exhaust gas absorption

Inactive Publication Date: 2015-07-01
XINDI ENERGY ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] 1) The existing lye preparation scheme is complex and cumbersome, and there are potential safety hazards;
[0019] 2) There is a large amount of quicklime waste, which is easy to block the tower;
[0020] 3) The primary water consumption is large, and the waste liquid cannot be recycled reasonably;
[0021] 4) The content of calcium hydroxide in the calcium fluoride filter residue is high, and the cost of recycling fluorine resources is high
[0033] The prior art does not disclose the same or very close technical solutions as the efficient and economical device for removing fluorine-containing waste gas in this application

Method used

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  • Fluorine-containing exhaust gas treatment device and method
  • Fluorine-containing exhaust gas treatment device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] see figure 1 , a fluorine-containing waste gas treatment device, which includes quicklime storage tank 1, screw feeder 2, lye tank 3, agitator 4, waste gas absorption towers 5 and 6, sediment collection tank 7, waste liquid filter device 9, lye pump 8. Waste liquid pump 10, lye distributor 11 and 12. The lye distributors 11 and 12 made up of lye nozzles are respectively arranged at the radial center above the waste gas absorption towers 5 and 6, and a gas phase distributor (made of Raschig ring fillers) is arranged below the lye distributors. Filling layer with a thickness of 20cm).

[0089] The quicklime (calcium oxide) sent into the factory area is sent to the quicklime storage tank 1 by means of pneumatic conveyance, and the outlet of the lower part of the storage tank is equipped with a frequency conversion screw feeder 2, and the feeding speed is automatically adjusted according to the amount of limestone, and the limestone is fed through a closed channel. Mix wi...

Embodiment 2

[0093] Such as figure 2 As shown, this embodiment is basically the same as Embodiment 1, the difference is that the tower top lye spray adopts upper and lower two-stage sprays, including the first-stage lye distributor 11 arranged in the waste gas absorption towers 5 and 6 respectively and 12, secondary lye distributors 13 and 14, their respective spray volumes are 1 to 3m 3 / min, the total spray volume is about 3~4m 3 / min, the amount of fluorine-containing waste gas introduced is 30-40m 3 / min, multi-stage purification and absorption of exhaust gas.

[0094] Sampling from the top discharge gas of exhaust gas absorption tower 5 or 6, and analyzing by gas chromatography, the HF content is lower than 0.15mg / m 3 . It shows that the absorption of HF is relatively thorough.

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Abstract

The invention discloses a fluorine-containing exhaust gas treatment device and method. The method comprises A, continuously preparing alkaline liquor from quicklime or calcium oxide by conveying quicklime in a quicklime storage tank into an alkaline liquor tank by a quicklime continuous feeding device and carrying out continuous adjustable preparation of alkaline liquor, B, carrying out exhaust gas absorption by distributing the prepared alkaline liquor down by an alkaline liquor distribution device above the interior of an exhaust gas absorption tower so that the alkaline liquor countercurrent contacts with fluorine-containing exhaust gas fed from the bottom of the exhaust gas absorption tower, discharging the gas without HF from the top of the exhaust gas absorption tower after contacting, and returning the waste liquid flowing out of a discharge outlet at the bottom of the exhaust gas absorption tower to the alkaline liquor tank, and C, treating the waste liquid by feeding precipitates on the bottom of the alkaline liquor tank into a precipitate treatment device such as a filtration device and carrying out treatment. The fluorine-containing exhaust gas treatment device and method have the advantages of environmental friendliness, safety and good exhaust-gas treatment effects.

Description

technical field [0001] The invention relates to a device and method for treating waste gas containing fluorine. More specifically, it relates to a device and a method for absorbing fluorine-containing waste gas by spraying lye prepared with quicklime. The fluorine-containing waste gas is waste gas from the process of preparing nitrogen fluoride, for example, from 4 HF and HF are used as raw materials to prepare NF by electrolysis 3 Fluorine-containing waste gas from the gas process. Background technique [0002] A large amount of waste gas containing acid gases is generated in industrial boilers. Exhaust gases containing acid gases are also produced in conventional electrolysis furnaces. In addition, waste gas will be generated during the preparation of nitrogen fluoride, for example, in the process of NH 4 HF and HF are used as raw materials to prepare NF by electrolysis 3 Fluorine-containing waste gas will be produced in the process of gas. [0003] With the rapid p...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/68
Inventor 辛军丁建梅韩海波
Owner XINDI ENERGY ENG TECH
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