CN102886197A - Treatment method for fluorine-containing waste gas - Google Patents
Treatment method for fluorine-containing waste gas Download PDFInfo
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- CN102886197A CN102886197A CN2012104021239A CN201210402123A CN102886197A CN 102886197 A CN102886197 A CN 102886197A CN 2012104021239 A CN2012104021239 A CN 2012104021239A CN 201210402123 A CN201210402123 A CN 201210402123A CN 102886197 A CN102886197 A CN 102886197A
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Abstract
The invention provides a treatment method for fluorine-containing waste gas and belongs to the technical field of environmental protection. In the treatment method, an absorption packed washing tower for an alkaline process and an electric demister are combined for use. Part of the gas between electrodes is ionized into positive and negative ions by a corona polar line in the electric demister, and dust and mist dispersing in the gas collide with the electronegative ions to bear negative electricity; and according to the principle that like charges repel, but opposite charges attract, the positive ions move onto the corona polar line, while electrons and the negative ions move to a receiving electrode, so that dust and mist particles bearing the negative electricity also move to the glass fiber reinforced plastic receiving electrode. Compared with the prior art, the treatment method can ensure that the success rate of fluoride is above 96%, and the fluoride can stably reach the discharge standard.
Description
Technical field
The present invention is a kind of isolated plant of a kind of waste gas containing fluoride improvement method and the method, belongs to the green technology neck.
Background technology
Conventional waste gas containing fluoride improvement method has two kinds: dry method, wet method.Dry method refers to adopt metal oxide (such as Al
2O
3), lime stone, the method for the Adsorption of fluoride compounds such as lime; This method exists that investment is large, the absorbent utilization rate is low, the difficult defective such as up to standard of pollutant emission, and the scope of application is less.Wet method refers to adopt water, alkaline solution to absorb fluoride, finally makes pollutant be converted into the absorption process of the compound of stable state; This method advantage is that purge volume is little, the advantages such as continuously-running; But in running and since in the absorption equipment behind water or the alkali liquor absorption fluoride easily with waste gas by smoke stack emission to surrounding air.
Require lower at the environmental protection standard that improves constantly, in the conventional soda solution grouting absorption technique, the waste gas unabsorbed dust of more water smoke, acid mist and wet method system of after absorbing, carrying under one's arms, a small amount of pollutant still with toxic emission to environment, the fluoride clearance can't reach requirement, and fluoride day monitoring compliance rate can't reach more than 96%.
Chinese patent 91109344 is processed the method for waste gas containing fluoride, disclose a kind of four absorption towers and processed waste gas containing fluoride, but this method floor space is also larger.
Summary of the invention
The object of the present invention is to provide and a kind ofly can stablize the waste gas containing fluoride improvement method that reaches discharge standard, environment purification after waste gas containing fluoride is administered by the method.
It is that alkaline process dry load scrubbing tower and electrostatic precipitator are combined with that the present invention solves the problems of the technologies described above the technical scheme that adopts.Corona polar line in the electrostatic precipitator is ionized into negative ions to portion gas between electrode, is dispersed in that dirt, mist and electronegative ion in the gas collided and bear is electric; According to two like magnetic poles repel each other, the principle that there is a natural attraction between the sexes, cation is mobile on the corona polar line, and electronics and anion are then shifted to receiving electrode, so the dirt behind the bear electricity, mist particle are also shifted to the fiberglass receiving electrode.
The present invention comprises following steps:
Alkaline process dry load scrubbing tower is combined with electrostatic precipitator, comprises following steps:
A, with the NaOH pump NaOH solution in the NaOH holding vessel is delivered in the cyclic water tank of alkaline process dry load scrubbing tower, opened running water pipe, add running water to cyclic water tank, make solution be full of cyclic water tank;
B, waste gas containing fluoride are from bottom to top by alkaline process dry load scrubbing tower, solution with water pump in the cyclic water tank is by spray piping and shower nozzle, evenly be sprayed on the hollow filling thing, with the stable fluoride aqueous solution of rear generation, fluoride aqueous solution enters cyclic water tank from top to bottom and recycles in the solution absorption that fluoride in the waste gas containing fluoride is ejected;
C, flue gas moisture and mist enter electrostatic precipitator from alkaline process dry load scrubbing tower top, with on the corona polar line in the dc high-voltage introducing electrostatic precipitator of 50-55 kilovolt, make it produce corona discharge by high-voltage D.C. generator; Charged acid mist particle is shifted to first on the receiving electrode inwall, then falls in the waste collection tank of electrostatic precipitator along wall;
Flue gas after D, the purification is evacuated to the chimney upper end by centrifugal blower and is disposed to environment;
Waste water regular update in E, cyclic water tank and the waste collection tank is disposed to waste water station and processes.
NaOH concentration of polymer solution in the NaOH holding vessel of the present invention is 30%; When solution is full of cyclic water tank, the solution PH in the cyclic water tank=8～10, when PH less than 7 the time, repeat the A step.The NaOH concentration of polymer solution that provides on the market at present is generally 30% or 50%, and in order to reach higher economic benefit, convenient transportation and carrying is avoided storing and use procedure can crystallization and blocking pipe, and selecting the employing mass concentration is 30% NaOH solution.Solution in the cyclic water tank is as the circulation absorbent, and when solution was full of cyclic water tank, the solution PH in the cyclic water tank was controlled at 8～10 scope, and the efficient that at this moment absorbs pollutant is high, and is not easy crystallization in cyclic water tank, pipeline and shower nozzle.Solution peace in the cyclic water tank requires to upgrade, and guarantees the effect that waste gas containing fluoride is processed.
When described solution is full of cyclic water tank, the solution PH in the cyclic water tank=9.Consider the efficient that absorbs pollutant and prevent cyclic water tank, pipeline and shower nozzle intercrystalline, get PH=9 the best.
Another object of the present invention is to provide a kind of device that is used for waste gas containing fluoride improvement method that waste gas containing fluoride can be stablized reach discharge standard, environment purification.
It is that the device of this waste gas containing fluoride improvement method comprises alkaline process dry load scrubbing tower, electrostatic precipitator, centrifugal blower, chimney, NaOH holding vessel and NaOH pump that the present invention solves the problems of the technologies described above the technical scheme that adopts; Supporting cyclic water tank, hollow filling thing, water pump, spray piping, shower nozzle and the running water pipe of being equipped with of described alkaline process dry load scrubbing tower, described water pump connects cyclic water tank and spray piping, and described running water pipe is connected with cyclic water tank; Supporting high-voltage D.C. generator, corona polar line, receiving electrode and the waste collection tank of being equipped with of described electrostatic precipitator, described waste collection tank is below electrostatic precipitator, described chimney is connected with the upper end of electrostatic precipitator, described centrifugal blower is installed in the bottom of chimney, and described NaOH pump connects NaOH holding vessel and cyclic water tank.
Electrostatic precipitator of the present invention is electric demisting device with conductive fiberglass reinforced plastic, and described receiving electrode is the fiberglass receiving electrode, and described centrifugal blower is that fiberglass centrifugal blower, described chimney are fiber glass reinforced plastic chimneys.The glass-reinforced plastic material corrosion resistance is strong, the corrosion of the various diluted acids of ability, alkali, salt medium.Electric demisting device with conductive fiberglass reinforced plastic has following advantage:
1, conduct electricity very well, demist efficient is high.Demist efficient can reach more than 99.7%, and outlet acid mist index can be hanged down 5mg/nm3;
2, good flame resistance detects through national professional testing agency, and the oxygen index (OI) of material can reach more than 28%, the receiving electrode pipe even the interior arcing of electric field can not ignited yet;
3, lightweight, intensity is high, appearance and size is stable, can not resemble the plumbous receiving electrode because of the long phenomenon that causes the distortion of utmost point pipe service time, has prolonged the service life of equipment;
4, compact conformation, the surfaces externally and internally of each utmost point pipe becomes precipitation surface, does not have the dead band between the utmost point pipe, processes the flue gas of same scale, and its volume is little, and floor space is few.
The present invention compared with prior art can guarantee the fluoride compliance rate more than 96%, and fluoride can be stablized and reaches discharge standard.
Description of drawings
Fig. 1 is the overall structure schematic diagram of present embodiment.
Label declaration: alkaline process dry load scrubbing tower A, electric demisting device with conductive fiberglass reinforced plastic B, fiberglass centrifugal blower C, fiber glass reinforced plastic chimney D, NaOH holding vessel E, NaOH pump F, cyclic water tank 1, hollow filling thing 2, water pump 3, spray piping 4, shower nozzle 5, running water pipe 6, high-voltage D.C. generator 7, corona polar line 8, fiberglass receiving electrode 9, waste collection tank 10.
The specific embodiment
The present invention is described in further detail below in conjunction with embodiment, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment: as shown in Figure 1, the waste gas containing fluoride controlling device of present embodiment comprises alkaline process dry load scrubbing tower A, electric demisting device with conductive fiberglass reinforced plastic B, fiberglass centrifugal blower C, fiber glass reinforced plastic chimney D, NaOH holding vessel E and NaOH pump F.Wherein: supporting cyclic water tank 1, hollow filling thing 2, water pump 3, spray piping 4, shower nozzle 5 and the running water pipe 6 of being equipped with of alkaline process dry load scrubbing tower A, water pump 3 connects cyclic water tank 1 and spray piping 4, and running water pipe 6 is connected with cyclic water tank 1; Supporting high-voltage D.C. generator 7, corona polar line 8, fiberglass receiving electrode 9 and the waste collection tank 10 of being equipped with of electric demisting device with conductive fiberglass reinforced plastic B, waste collection tank 10 is below electric demisting device with conductive fiberglass reinforced plastic B, fiber glass reinforced plastic chimney D is connected with the upper end of electric demisting device with conductive fiberglass reinforced plastic B, fiberglass centrifugal blower C is installed in the bottom of fiber glass reinforced plastic chimney D, and NaOH pump F connects NaOH holding vessel E and cyclic water tank 1.
The waste gas containing fluoride improvement method of present embodiment the steps include:
A, with NaOH pump F the 30%NaOH solution among the NaOH holding vessel E is delivered in the cyclic water tank 1 among the alkaline process dry load scrubbing tower A, opened running water pipe 6, add running water to cyclic water tank 1, configure the NaOH solution of PH=9 and be full of cyclic water tank 1;
B, waste gas containing fluoride are from bottom to top by alkaline process dry load scrubbing tower A, the NaOH solution with water pump 3 of the PH=9 that configures in the cyclic water tank 1 is by spray piping 4, shower nozzle 5, evenly be sprayed on the hollow filling thing 2, fluoride is recycled in the solution absorption in the water tank 1 and the stable fluoride aqueous solution of rear generation, and solution enters cyclic water tank 1 from top to bottom and recycles;
C, moisture and flue gas mist enters electric demisting device with conductive fiberglass reinforced plastic B from the top of alkaline process dry load scrubbing tower A, electric demisting device with conductive fiberglass reinforced plastic B passes through high-voltage D.C. generator 7 with on the corona polar line 8 in 55 kilovolts the dc high-voltage introducer, make it produce corona discharge, keep an electrostatic field that is enough to make gas ionization, portion gas between electrode is ionized into negative ions, dirt, the particles such as mist are run into ion and are charged, according to two like magnetic poles repel each other, the principle that there is a natural attraction between the sexes, cation moves on corona polar line 8, and the dirt behind electronics and the bear electricity, the mist particle moves to the opposite fiberglass receiving electrode 9 of electric polarity; Charged acid mist particle descends along the inwall of fiberglass receiving electrode 9 by deadweight, falls in the waste collection tank 10 of electric demisting device with conductive fiberglass reinforced plastic B;
Flue gas after D, the purification is evacuated to fiber glass reinforced plastic chimney D by fiberglass centrifugal blower C and is disposed to environment;
Waste water regular update in E, the waste collection tank 10 is disposed to waste water station and processes; Solution PH in the cyclic water tank 1 upgrades less than 7 and the concentration of fluoride when being higher than 500mg/L, repeats the A step.
For making the electrostatic precipitator high-efficiency operation, should make voltage high as far as possible in rated range; But under the prerequisite that guarantees treatment effeciency, in order to save electric energy, the voltage general control is in certain scope.Dc high-voltage effect with 55 kilovolts in the present embodiment is best.
Record the fluoride compliance rate of the flue gas after the purification that is disposed to environment in the present embodiment more than 96%, fluoride can be stablized and reaches discharge standard.
In addition, need to prove, the specific embodiment described in this specification, its proportioning, title that technique is named etc. can be different.Allly conceive equivalence or the simple change that described structure, feature and principle are done according to patent of the present invention, be included in the protection domain of patent of the present invention.Those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, all should belong to protection scope of the present invention.
Although the present invention with embodiment openly as above; but it is not to limit protection scope of the present invention; any technical staff who is familiar with this technology not breaking away from change and the retouching of doing in the spirit and scope of the present invention, all should belong to protection scope of the present invention.
Claims (5)
1. a waste gas containing fluoride improvement method adopts alkaline process dry load scrubbing tower to absorb fluoride, finally makes pollutant be converted into the compound of stable state; It is characterized in that: alkaline process dry load scrubbing tower is combined with electrostatic precipitator, comprises following steps:
With the NaOH pump NaOH solution in the NaOH holding vessel is delivered in the cyclic water tank of alkaline process dry load scrubbing tower, opened running water pipe, add running water to cyclic water tank, make solution be full of cyclic water tank;
Waste gas containing fluoride is from bottom to top by alkaline process dry load scrubbing tower, solution with water pump in the cyclic water tank is by spray piping and shower nozzle, evenly be sprayed on the hollow filling thing, with the stable fluoride aqueous solution of rear generation, fluoride aqueous solution enters cyclic water tank from top to bottom and recycles in the solution absorption that fluoride in the waste gas containing fluoride is ejected;
Moisture and flue gas mist enters electrostatic precipitator from alkaline process dry load scrubbing tower top, with on the corona polar line in the dc high-voltage introducing electrostatic precipitator of 50-55 kilovolt, makes it produce corona discharge by high pressure generator; Charged acid mist particle is shifted to first on the receiving electrode inwall, then falls in the waste collection tank of electrostatic precipitator along wall;
Flue gas after the purification is evacuated to the chimney upper end by centrifugal blower and is disposed to environment;
Waste water regular update in cyclic water tank and the waste collection tank is disposed to waste water station and processes.
2. waste gas containing fluoride improvement method according to claim 1, it is characterized in that: the NaOH concentration of polymer solution in the described NaOH holding vessel is 30%; When solution was full of cyclic water tank, the A step when PH little 7, was repeated in the solution PH in the cyclic water tank=8～10.
3. waste gas containing fluoride improvement method according to claim 2 is characterized in that: when described solution is full of cyclic water tank, and the solution PH in the cyclic water tank=9.
4. a device that is used for claim 1 or 2 or 3 described waste gas containing fluoride improvement methods is characterized in that: comprise alkaline process dry load scrubbing tower, electrostatic precipitator, centrifugal blower, chimney, NaOH holding vessel and NaOH pump; Supporting cyclic water tank, hollow filling thing, water pump, spray piping, shower nozzle and the running water pipe of being equipped with of described alkaline process dry load scrubbing tower, described water pump connects cyclic water tank and spray piping, and described running water pipe is connected with cyclic water tank; Supporting high-voltage D.C. generator, corona polar line, receiving electrode and the waste collection tank of being equipped with of described electrostatic precipitator, described waste collection tank is below electrostatic precipitator, described chimney is connected with the upper end of electrostatic precipitator, described centrifugal blower is installed in the bottom of chimney, and described NaOH pump connects NaOH holding vessel and cyclic water tank.
5. the device of waste gas containing fluoride improvement method according to claim 4, it is characterized in that: described electrostatic precipitator is electric demisting device with conductive fiberglass reinforced plastic, described receiving electrode is the fiberglass receiving electrode, and described centrifugal blower is the fiberglass centrifugal blower, and described chimney is fiber glass reinforced plastic chimney.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210402123.9A CN102886197B (en) | 2012-10-22 | 2012-10-22 | Treatment method for fluorine-containing waste gas |
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| CN201210402123.9A CN102886197B (en) | 2012-10-22 | 2012-10-22 | Treatment method for fluorine-containing waste gas |
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| CN102886197B CN102886197B (en) | 2014-11-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105642095A (en) * | 2015-12-31 | 2016-06-08 | 安徽省绿巨人环境技术有限公司 | Device and method for treating fluoride-containing waste gas |
| CN108283852A (en) * | 2017-12-02 | 2018-07-17 | 新疆阜丰生物科技有限公司 | A method of administering fertilizer drying tail gas using plasma technology |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887410A (en) * | 2005-06-29 | 2007-01-03 | 财团法人工业技术研究院 | Method and equipment for treating gas containing fluorine-containing compounds |
| CN202460442U (en) * | 2011-12-21 | 2012-10-03 | 河南海力特机电制造有限公司 | Acid mist absorption processing device of high-pressure water mist |
-
2012
- 2012-10-22 CN CN201210402123.9A patent/CN102886197B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887410A (en) * | 2005-06-29 | 2007-01-03 | 财团法人工业技术研究院 | Method and equipment for treating gas containing fluorine-containing compounds |
| CN202460442U (en) * | 2011-12-21 | 2012-10-03 | 河南海力特机电制造有限公司 | Acid mist absorption processing device of high-pressure water mist |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105642095A (en) * | 2015-12-31 | 2016-06-08 | 安徽省绿巨人环境技术有限公司 | Device and method for treating fluoride-containing waste gas |
| CN108283852A (en) * | 2017-12-02 | 2018-07-17 | 新疆阜丰生物科技有限公司 | A method of administering fertilizer drying tail gas using plasma technology |
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| CN102886197B (en) | 2014-11-05 |
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