CN102886197B - Treatment method for fluorine-containing waste gas - Google Patents
Treatment method for fluorine-containing waste gas Download PDFInfo
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- CN102886197B CN102886197B CN201210402123.9A CN201210402123A CN102886197B CN 102886197 B CN102886197 B CN 102886197B CN 201210402123 A CN201210402123 A CN 201210402123A CN 102886197 B CN102886197 B CN 102886197B
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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 special purpose device of a kind of waste gas containing fluoride improvement method and the method, belongs to green technology neck.
Background technology
Conventional waste gas containing fluoride improvement method has two kinds: dry method, wet method.Dry method refers to and adopts metal oxide (as Al
2o
3), lime stone, the method for the Adsorption of fluoride compounds such as lime; This method exists that investment is large, absorbent utilization rate is low, the difficult defect such as up to standard of pollutant emission, and the scope of application is less.Wet method refers to and adopts 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, due to after water in absorption equipment or alkali liquor absorption fluoride easily with waste gas by smoke stack emission to surrounding air.
Under the environmental protection standard improving constantly requires, in conventional soda solution grouting absorption technique, the waste gas unabsorbed dust of more water smoke, acid mist and wet method system of carrying under one's arms after absorbing, a small amount of pollutant still with toxic emission to environment, fluoride clearance cannot reach requirement, and fluoride day monitoring compliance rate cannot 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 adopted technical scheme.Corona polar line in electrostatic precipitator is ionized into negative ions portion gas between electrode, is dispersed in that dirt, mist and electronegative ion in 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 moves on corona polar line, and electronics and anion are shifted to receiving electrode, so the dirt after bear electricity, mist particle are also shifted to 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 NaOH pump, the NaOH solution in 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 cyclic water tank is by spray piping and shower nozzle, evenly be sprayed on hollow filling thing, the solution that fluoride in waste gas containing fluoride is ejected generates stable fluoride aqueous solution after absorbing neutralization, and fluoride aqueous solution enters cyclic water tank from top to bottom and recycles;
C, flue gas moisture and mist enter electrostatic precipitator from alkaline process dry load scrubbing tower top, by high-voltage D.C. generator, the DC high-voltage of 50-55 kilovolt are introduced on the corona polar line in electrostatic precipitator, make it produce corona discharge; Charged acid mist particle is first shifted on receiving electrode inwall, then along wall, falls in the waste collection tank of electrostatic precipitator;
Flue gas after D, purification is evacuated to chimney upper end by centrifugal blower and is disposed to environment;
Waste water regular update in E, cyclic water tank and waste collection tank, is disposed to waste water station and processes.
NaOH concentration of polymer solution in NaOH holding vessel of the present invention is 30%; When solution is full of cyclic water tank, solution PH=8～10 in cyclic water tank, when PH is less than 7, repeat A step.The NaOH concentration of polymer solution providing on the market is at present generally 30% or 50%, and in order to reach higher economic benefit, convenient transportation and carrying, avoids storing and use procedure can crystallization and blocking pipe is selected the NaOH solution that employing mass concentration is 30%.Solution in cyclic water tank is as circulation absorbent, and when solution is full of cyclic water tank, the solution PH in cyclic water tank is controlled at 8～10 scope, and the efficiency that at this moment absorbs pollutant is high, and is not easy crystallization in cyclic water tank, pipeline and shower nozzle.Solution peace in 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, solution PH=9 in cyclic water tank.Consider and absorb the efficiency of 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 waste gas containing fluoride that makes can stablize the device for waste gas containing fluoride improvement method that reaches 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 adopted technical scheme; Supporting cyclic water tank, hollow filling thing, water pump, spray piping, shower nozzle and the running water pipe of being provided 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 provided 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 arranged on 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 fiberglass receiving electrode, and described centrifugal blower is that fiberglass centrifugal blower, described chimney are fiber glass reinforced plastic chimneys.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 tool has the following advantages:
1, conduct electricity very well, demist efficiency is high.Demist efficiency can reach more than 99.7%, and outlet acid mist index can low 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 if the interior arcing of electric field can not ignited yet;
3, lightweight, intensity is high, appearance and size is stable, can not resemble plumbous receiving electrode because of the long phenomenon that causes the distortion of utmost point pipe service time, has extended the service life of equipment;
4, compact conformation, the surfaces externally and internally of each utmost point pipe becomes precipitation surface, does not have dead band between 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 that fluoride compliance rate is more than 96%, and fluoride can be stablized and reaches discharge standard.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the 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
Below in conjunction with embodiment, the present invention is described in further detail, 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 the 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 provided 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 provided 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 arranged on 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 the present embodiment, the steps include:
A, with NaOH pump F, the 30%NaOH solution in NaOH holding vessel E is delivered in the cyclic water tank 1 in 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 configuring in cyclic water tank 1 is by spray piping 4, shower nozzle 5, evenly be sprayed on hollow filling thing 2, the solution that fluoride is recycled in water tank 1 absorbs the stable fluoride aqueous solution of the rear generation of neutralization, 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 by corona polar line 8 in the DC high-voltage introducer of 55 kilovolts, make it produce corona discharge, maintain 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 encountered 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 dirt after electronics and bear electricity, mist particle moves to the contrary fiberglass receiving electrode 9 of electric polarity, charged acid mist particle, by under conducting oneself with dignity along the inwall of fiberglass receiving electrode 9, falls in the waste collection tank 10 of electric demisting device with conductive fiberglass reinforced plastic B,
Flue gas after D, 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, waste collection tank 10, is disposed to waste water station and processes; Solution PH in cyclic water tank 1 is less than 7 and the concentration of fluoride during higher than 500mg/L, upgrades, and repeats A step.
For making electrostatic precipitator high-efficiency operation, should make voltage high as far as possible in rated range; But guaranteeing that under the prerequisite for the treatment of effeciency,, in order to save electric energy, voltage general control is in certain scope.DC high-voltage effect with 55 kilovolts in the present embodiment is best.
In the present embodiment, record the fluoride compliance rate of the flue gas after the purification that is disposed to environment more than 96%, fluoride can be stablized and reaches discharge standard.
In addition, it should be noted that, the specific embodiment described in this description, its proportioning, title that technique is named etc. can be different.All equivalence or simple change of doing according to described structure, feature and the principle of patent design of the present invention, are included in the protection domain of patent of the present invention.Those skilled in the art can make various modifications or supplement 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 in order to limit protection scope of the present invention; any technical staff who is familiar with this technology, not departing 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 (4)
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: adopt the device of waste gas containing fluoride improvement method to carry out waste gas containing fluoride improvement, described device comprises 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 provided 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 provided 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 arranged on the bottom of chimney, described NaOH pump connects NaOH holding vessel and cyclic water tank, and waste gas containing fluoride improvement method comprises following steps:
With NaOH pump, the NaOH solution in 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 cyclic water tank is by spray piping and shower nozzle, evenly be sprayed on hollow filling thing, the solution that fluoride in waste gas containing fluoride is ejected generates stable fluoride aqueous solution after absorbing neutralization, and fluoride aqueous solution enters cyclic water tank from top to bottom and recycles;
Moisture and flue gas mist enters electrostatic precipitator from alkaline process dry load scrubbing tower top, by high pressure generator, the DC high-voltage of 50-55 kilovolt is introduced on the corona polar line in electrostatic precipitator, makes it produce corona discharge; Charged acid mist particle is first shifted on receiving electrode inwall, then along wall, falls in the waste collection tank of electrostatic precipitator;
Flue gas after purification is evacuated to chimney upper end by centrifugal blower and is disposed to environment;
Waste water regular update in cyclic water tank and waste collection tank, is disposed to waste water station and processes.
2. waste gas containing fluoride improvement method according to claim 1, is characterized in that: the NaOH concentration of polymer solution in described NaOH holding vessel is 30%; When solution is full of cyclic water tank, the pH in cyclic water tank is between 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 pH=9 in cyclic water tank.
4. waste gas containing fluoride improvement method according to claim 1, is characterized in that: described electrostatic precipitator is electric demisting device with conductive fiberglass reinforced plastic, and described receiving electrode is fiberglass receiving electrode, and described centrifugal blower is 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 true CN102886197B (en) | 2014-11-05 |
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| 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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| 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 |
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