CN110756038A - Dry-method defluorination and dust removal flue gas purification system and method - Google Patents
Dry-method defluorination and dust removal flue gas purification system and method Download PDFInfo
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Abstract
The invention discloses a dry defluorination dust removal flue gas purification system and a dry defluorination dust removal flue gas purification method, wherein a first feed opening and a second feed opening are arranged at the bottom end of an alumina storage tank in the system; the first feed opening is sequentially communicated with a first air extraction chamber, a first air locker, a first mixer and a spray gun, the first mixer is communicated with a first compressed air conveying pipeline, and an outlet of the spray gun is communicated with a flue; the flue behind the outlet of the spray gun is sequentially communicated with a venturi tube reactor, a dust remover, a Roots blower and the bittern smoke; the second feed opening is sequentially communicated with a second air extracting chamber, a second air locking device and a second mixer, a second compressed air conveying pipeline is communicated with the second mixer, and an outlet of the second mixer is communicated with the Venturi tube reactor. The defluorination efficiency of the system can reach 99.7 percent, the reaction rate is high, and the system is suitable for non-aluminum industries; the method is simple, no waste water is generated, and when the HF concentration is increased in a pulse mode, the spray gun is started to spray alumina, so that the emission requirement can be met.
Description
Technical Field
The invention relates to the field of environmental protection and dust removal, in particular to a system and a method for purifying flue gas by dry defluorination and dust removal.
Background
The existing flue gas in non-aluminum industry contains HF and SO2、CO、NOX、CO2、SIF4Of equal composition, dust containing gaseous fluoride willSeriously polluting the atmospheric environment and influencing the physical health of field operators. With the increasing improvement of national environmental protection requirements on the production operating environment and smoke emission standards of factories, system configuration of relevant treatment facilities by manufacturers is urgently required due to the condition of environmental protection one-ticket disclaimer, and the research and development of the defluorination and high-efficiency dust removal system for fluorine-containing flue gas can meet the requirements of the manufacturers on the production operating environment and the smoke emission standards.
The existing wet-method defluorination and dust removal method is mostly adopted, a large amount of water needs to be added by adopting a wet-method process, and wastewater is easily generated, so that secondary pollution is caused, and the method is not suitable for arid areas. In addition, the efficiency of defluorination and dust removal for the flue gas is low, and the increasingly strict environmental protection requirement at present cannot be met.
At present, a VRI reactor is generally adopted, a feeding part of the VRI reactor is a hollow cone porous hole, so that alumina powder entering the VRI reactor is easily distributed unevenly, adsorption is incomplete, environmental protection data reach the standard and discharge is unstable, and the possibility of blockage exists. The VRI reactor has a porous circular cross section, and is worn seriously after being used for a period of time, the service function is reduced, and the defluorination efficiency is reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a system and a method for purifying flue gas by dry-method defluorination and dust removal, wherein the defluorination efficiency of the system can reach 99.7 percent, the flow rate of the flue gas is 15-22 m/s, the temperature of the flue gas is 120-; the method is simple, no waste water is generated, and when the HF concentration is increased in a pulse mode, the spray gun is started to spray alumina, so that the emission requirement can be met.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
A dry defluorination dust removal flue gas purification system comprises: the device comprises an aluminum oxide storage tank, a Venturi tube reactor, a flue, a dust remover, a Roots blower and bittern; the bottom end of the alumina storage tank is provided with a first feed opening and a second feed opening;
the first feed opening is sequentially communicated with a first air extraction chamber, a first air locker, a first mixer and a spray gun, the first mixer is communicated with a first compressed air conveying pipeline, and an outlet of the spray gun is communicated with a flue; the flue behind the outlet of the spray gun is sequentially communicated with a venturi tube reactor, a dust remover, a Roots blower and the bittern smoke;
the second feed opening is sequentially communicated with a second air extracting chamber, a second air locking device and a second mixer, the second mixer is communicated with a second compressed air conveying pipeline, and an outlet of the second mixer is communicated with the Venturi tube reactor.
Preferably, a third compressed air conveying pipeline is communicated with the venturi tube reactor.
Preferably, the dust remover is a bag-type dust remover.
Preferably, an HF detector is arranged on a flue between the dust remover and the Roots blower.
Preferably, the device also comprises a fluorine-carrying alumina storage tank, and a discharge hole of the dust remover is sequentially communicated with a third air extraction chamber, a third air locker, a third mixer and the fluorine-carrying alumina storage tank; a fourth compressed air conveying pipeline is communicated with the third mixer;
and a discharge port of the fluorine-carrying alumina storage tank is sequentially communicated with a fourth air extraction chamber, a fourth air locker and a fourth mixer, an outlet of the fourth mixer is communicated with the Venturi tube reactor, and a fifth compressed air conveying pipeline is communicated with the fourth mixer.
(II) a dry-method defluorination dust removal flue gas purification method, which comprises the following steps:
step 2, mixing the alumina powder in the alumina storage tank and the compressed air in the second compressed air conveying pipeline through a second mixer, and then conveying the mixture into the venturi tube reactor;
step 4, the defluorinated flue gas and the fluorine-carrying alumina are sent into a dust remover for gas-solid separation to obtain purified gas; the purified gas is discharged from the smoke furnace, and the solid is discharged from a discharge hole of the dust remover and collected.
Preferably, in the step 1, the flow velocity of the flue gas in the flue is 15-22 m/s, and the temperature in the flue is 120-150 ℃.
Preferably, the method also comprises a step 5, mixing the solid discharged from the discharge port of the dust remover with compressed air in a fourth compressed air conveying pipeline through a third mixer and then conveying the mixture into a fluorine-carrying alumina storage tank, mixing the substance discharged from the outlet of the fluorine-carrying alumina storage tank with compressed air in a fifth compressed air conveying pipeline through a fourth mixer and then conveying the mixture into the venturi reactor for adsorption.
Compared with the prior art, the invention has the beneficial effects that:
(1) the dry-method defluorination and dust removal flue gas purification system obtained by the invention has the defluorination efficiency reaching 99.7 percent, the flue gas flow rate of 15-22 m/s, the flue gas temperature of 120-.
(2) Using powdered Al2O3The product of the reaction with HF is AlF3And H2O, water is water vapor at the smoke temperature of 120 ℃, the reaction does not need to be added with water, secondary pollution containing waste water is not generated, and the method is particularly suitable for arid areas. By adopting the spray gun, when the HF concentration is increased in a pulse mode, the spray gun is started to spray alumina, so that the emission requirement can be met.
(3) The Venturi tube reactor adopted by the invention is provided with two alumina feed inlets, the inside of the Venturi tube reactor is in an open circular tube shape, the alumina is quickly blown away by compressed air and high-speed airflow from the throat of the Venturi tube reactor to be fully mixed with flue gas, the contact is full and the adsorption is thorough, and the HF removal efficiency is higher than that of a VRI reactor. The venturi reactor feed section is round tubular and has no attrition conditions, and thus defluorination efficiency is not affected thereby. The alumina put into the flue in unit time of the VRI reactor is less than the input amount of the venturi reactor, and the defluorination efficiency under the same working condition is lower than that of the venturi reactor. The HF removing efficiency of the venturi reactor can reach 99.7 percent, which is higher than 99.2 percent of that of a VRI reactor.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a diagram of a system for purifying flue gas by dry defluorination and dust removal according to the present invention;
in the figure: 1, an alumina storage tank; 101 a first feed opening; 102 a second feed opening; 103 a dust remover at the top of the bin; 104 a gasification plate; 2 a first pumping chamber; 3 a first airlock; 4 a first mixer; 5, a spray gun; 6, a flue; 7 a first compressed air delivery duct; 8 a second pumping chamber; 9 a second airlock; 10 a second mixer; 11 a second compressed air delivery duct; 12 a venturi reactor; 13 a dust remover; 1301 a return air chute; 14 Roots blower; 15, smoking bittern; 16 a third compressed air delivery conduit; a 17 HF detector; 18-load fluorine-containing alumina storage tank; 19 a third pumping chamber; 20 a third airlock; 21 a third mixer; 22 a fourth compressed air delivery conduit; 23 a fourth pumping chamber; 24 a fourth airlock; 25 a fourth mixer; 26 a fifth compressed air delivery conduit; 27 waste collection bag.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Referring to fig. 1, a dry defluorination and dust removal flue gas purification system according to an embodiment of the present disclosure includes: the device comprises an alumina storage tank 1, a venturi tube reactor 12, a flue 6, a dust remover 13, a Roots blower 14 and bittern smoke 15; the bottom end of the alumina storage tank 1 is provided with a first feed opening 101 and a second feed opening 102; the first feed opening 101 is sequentially communicated with a first air extracting chamber 2, a first air locker 3, a first mixer 4 and a spray gun 5, the first mixer 4 is communicated with a first compressed air conveying pipeline 7, and an outlet of the spray gun 5 is communicated with a flue 6; the flue 6 positioned behind the outlet of the spray gun 5 is sequentially communicated with a venturi tube reactor 12, a dust remover 13, a Roots blower 14 and bittern smoke 15; the second feed opening 102 is sequentially communicated with a second extraction chamber 8, a second air locker 9 and a second mixer 10, the second mixer 10 is communicated with a second compressed air conveying pipeline 11, and an outlet of the second mixer 10 is communicated with the venturi reactor 12.
In the above embodiment, the alumina storage tank 1 is used for storing fresh alumina powder, and the bottom end of the alumina storage tank 1 is provided with the first feed opening 101 and the second feed opening 102; the gasification plate 104 is arranged on the alumina storage tank 1 to prevent hardening of the alumina storage tank 1, and compressed air is blown to prevent hardening of the alumina material and prevent the alumina material from falling smoothly; the top of the alumina storage tank 1 is provided with a bin top dust remover 13103 which prevents the generation of raise dust during the charging process and discharges the dust outdoors. The first feeding hole 101 is sequentially connected with a manual gate valve, a first air extracting chamber 2, a first air locker 3, a manual gate valve, a first mixer 4 and a spray gun 5 through pipelines, the pipelines and all the parts are connected by flanges, and the first mixer 4 is also connected with a first compressed air conveying pipeline 7. The second feed opening 102 is sequentially connected with a manual gate valve, a second extraction chamber 8, a second air locker 9, a manual gate valve, a second mixer 10 and a venturi tube reactor 12 through pipelines, and the second mixer 10 is also connected with a second compressed air conveying pipeline 11. The air lock makes compressed air flow towards the falling direction of the material, and the air lock needs to control air return through the air extraction chamber.
Fresh alumina powder is fed into the first mixer 4 through the first feed opening 101, compressed air in the first compressed air conveying pipeline 7 and the alumina powder are fully and uniformly mixed in the first mixer 4, the mixed alumina powder is fed into the spray gun 5 (the spray gun 5 is welded with the flue 6 and is standby equipment for spraying alumina) by utilizing the strength of the compressed air, and then the mixed alumina powder is sprayed into the flue 6 to perform adsorption with fluorine-containing flue gas. The alumina powder is fed into the second mixer 10 through the second feed opening 102, the compressed air in the second compressed air conveying pipeline 11 and the alumina powder are fully and uniformly mixed in the second mixer 10, and the mixed alumina powder is fed into the venturi reactor 12 by utilizing the pneumatic force of the compressed air. A waste collecting bag 27 is arranged below the venturi reactor 12 and is used for collecting fluorine-carrying alumina without defluorination efficiency and discharging waste. Pneumatic conveying is adopted for conveying the alumina, the pressure balance of each branch is required to be ensured, and the balance is required to be adjusted through a pressure reducing valve.
The venturi tube reactor 12 can continuously defluorinate the recycled fluorine-carrying alumina, and the fresh alumina reacts with HF; the fluorine-carrying alumina and fresh alumina are added in proportion, which is beneficial to the economy of the consumption of reaction materials. After the venturi tube reactor 12, the flue 6 is connected with the dust remover 13 through a flange, a return air chute 1301, a fluorine-carrying alumina circulation regulating valve, a manual gate valve, a roots blower 14 and the like are arranged below a filter bag of the dust remover 13, the return air chute 1301 is connected with main body equipment of the dust remover 13 in a full-welding mode, the fluorine-carrying alumina circulation regulating valve is connected with a pipeline below the return air chute 1301 in a flange mode, the manual gate valve is connected with the pipeline below the regulating valve in a flange mode, and the roots blower 14 is connected with the pipeline below the return air chute 1301 in a flange mode.
In the presence of Hydrogen Fluoride (HF), SO2、CO、NOX、CO2、SIF4Etc., the boiling point of HF is the highest at 19.5 ℃, and condensation and evaporation of gases are caused by intermolecular van der waals forces. The minimum level energy required for the gas to be adsorbed is equivalent to the energy for the gas to be condensed into liquid, and when the gas difficult to liquefy has small adsorption capacity; therefore, hydrogen fluoride is most easily adsorbed.
Alumina (Al)2O3) Is a porous structure substance with large internal surface area, which provides contact opportunity between the adsorbate and the adsorbent, so that the larger the specific surface area is, the larger the capacity for receiving adsorption is, and the adsorption quantity is increased along with the increase of the specific surface area. The adsorption effect of alumina mainly depends on gamma-type alumina, so that the content of gamma-type alumina is proportional to the adsorption amount. In order to improve the removal efficiency of HF in the flue gas, high gamma-Al is adopted as much as possible2O3Content of Al2O3。
The reaction equation is as follows: al (Al)2O3+6HF＝2AlF3+3H2O
The principle of adsorption reaction: the adsorption of hydrogen fluoride by alumina is mainly based on chemical adsorption and secondary to physical adsorption. As a result of chemisorption, a monomolecular adsorbed compound was formed on the surface of alumina. The process is that the dust remover 13 is started after the draught fan is started, the action of the draught fan enables the flue gas of the front-end process to enter the flue 6 and pass through the venturi tube reactor 12, the newly added alumina and the flue gas are fully mixed, the adsorption reaction is carried out to adsorb the hydrogen fluoride in the flue gas, the solid materials such as fluorine-carrying alumina dust and the like enter the reaction channel together with the flue gas after the reaction, the adsorption reaction is carried out again, the solid materials enter the air chamber of the bag-type dust remover through the ash bucket, the adsorption is stopped on the outer surface of the filter bag, the alumina (also called as fluorine-carrying alumina) adsorbing the hydrogen fluoride and the flue gas with high fluorine concentration react again, and therefore higher fluorine purification.
The working principle of filtration is as follows: the fluorine-containing flue gas is firstly fed by a venturi tube reactor 12 on a vertical tube section, and fresh alumina and fluorine-carrying alumina are added, so that the first reaction and adsorption of the purification system are called. The smoke enters the air inlet channel of the dust remover 13, so that the smoke uniformly passes through the descending flue 6 arranged in the box body, enters the dust chamber of the box body of each dust remover 13 through the air inlet channel and the dust hopper, the air flow speed is reduced along with the expansion of the section, the air flow is deflected downwards, coarse particle dust directly falls into the dust hopper due to inertial sedimentation, and fine dust enters the filter chamber along with the air flow; the lower part of the ash bucket is provided with the fluidized bed, so that the storage and discharge of the alumina powder can be integrated into a whole, and a certain alumina storage space is provided. The return air chute 1301 is blown by air blown by the Roots blower 14 at the bottom, alumina in the ash bucket is fully mixed, and fresh alumina and fluorine-containing alumina act and adsorb and react again, which is called as secondary reaction and adsorption. When fine particles reach the surface of the filter bag, dust is accumulated on the surface of the filter bag, a certain amount of alumina is generally controlled on the surface area of the filter bag during ash removal, and when new particles are adsorbed by the attraction of an induced draft fan, the adsorbed particles react with the original alumina particles again, which is called as a third adsorption reaction. The filtered gas is then discharged to the atmosphere via a blower.
Referring to FIG. 1, a third compressed air delivery conduit 16 is connected to the venturi reactor 12 according to one embodiment of the present invention.
In the above embodiment, the third compressed air delivery pipe 16 introduces air into the venturi reactor, which is beneficial to the sufficient contact reaction of the substances in the venturi reactor and improves the defluorination efficiency.
Referring to fig. 1, according to one embodiment of the present invention, the dust collector 13 is a bag-type dust collector.
In the above embodiment, the bag-type dust collector is used for mixing the purified gas with the fluorine-carrying Al2O3Gas-solid separation is carried out, and the alumina powder is subjected to adsorption reaction with unreacted HF gas and fluoride gas (fluosilicic acid).
Referring to fig. 1, according to an embodiment of the present invention, an HF detector 17 is provided on the flue 6 between the dust remover 13 and the roots blower 14.
In the above embodiment, the HF detector 17 is connected to the hole previously left in the flue 6 between the dust remover 13 and the roots blower 14 in a manner of a sleeve, the HF detector 17 is used to detect the HF concentration in the flue gas after the dust remover 13 is applied, calculate the alumina consumption by a chemical reaction equation based on the detected HF concentration, and select the alumina flow rate corresponding to the lance 5.
Referring to fig. 1, according to an embodiment of the present invention, the present invention further comprises a fluorine-carrying alumina storage tank 18, and a discharge port of the dust remover 13 is sequentially communicated with a third air pumping chamber 19, a third air lock 20, a third mixer 21 and the fluorine-carrying alumina storage tank 18; a fourth compressed air conveying pipeline 22 is communicated with the third mixer 21; and a discharge port of the fluorine-carrying aluminum oxide storage tank 18 is sequentially communicated with a fourth extraction chamber 23, a fourth air locker 24 and a fourth mixer 25, an outlet of the fourth mixer 25 is communicated with the venturi tube reactor 12, and a fifth compressed air conveying pipeline 26 is communicated with the fourth mixer 25.
In the above embodiment, the transportation of the fluorine-carrying alumina in the fluorine-carrying alumina tank 18 is the same as that of the alumina, and the two have the same blanking structure. Fresh alumina becomes fluorine-carrying alumina after adsorbing fluoride, and the efficiency of the fluorine-carrying alumina for adsorbing hydrogen fluoride is far higher than that of the fresh alumina, so that the fluorine-carrying alumina is recycled to participate in adsorption reaction, and the adsorption reaction efficiency can be effectively improved. The fluorine-carrying dust collected by the dust remover 13 passes through a discharge valve to an aluminum fluoride storage tank, and the collected fluorine-carrying dust can be recycled in the electrolytic aluminum industry without secondary pollution.
(II) a dry-method defluorination dust removal flue gas purification method, which comprises the following steps:
And 2, mixing the alumina powder in the alumina storage tank 1 and the compressed air in the second compressed air conveying pipeline 11 through a second mixer 10, and then conveying the mixture into the venturi reactor 12.
And 3, fully adsorbing the fluorine-carrying aluminum oxide and the aluminum oxide powder with the flue gas in the Venturi tube reactor 12 to obtain the defluorinated flue gas and the fluorine-carrying aluminum oxide.
Step 4, the defluorinated flue gas and the fluorine-carrying alumina are sent into a dust remover 13 for gas-solid separation to obtain purified gas; the purified gas is discharged from the smoke oven, and the solids are discharged from the discharge port of the dust collector 13 and collected.
And 5, mixing the solid discharged from the discharge port of the dust remover 13 and the compressed air in the fourth compressed air conveying pipeline 22 through the third mixer 21, conveying the mixture into the fluorine-carrying aluminum oxide storage tank 18, mixing the substance discharged from the outlet of the fluorine-carrying aluminum oxide storage tank 18 and the compressed air in the fifth compressed air conveying pipeline 26 through the fourth mixer 25, and conveying the mixture into the venturi reactor 12 for adsorption.
The reactable temperature range of the alumina and the hydrogen fluoride is 120-150 ℃, and the optimal reaction temperature is 120 ℃; because the reaction is to spray alumina into the flue 6 at a high speed instantly by means of the formation of the Venturi reactor, the Venturi reactor needs to be installed on the vertical flue 6, the flow rate of flue gas needs to be 15-22 m/s, and the length of the flue 6 needs to ensure that the reaction time of alumina and HF is at least 1 s; the reaction rate of the reaction is particularly fast and the reaction is completed within 1 s.
The dry defluorination and dust removal flue gas purification system comprises a first defluorination system, a dust removal system, a pneumatic conveying system and a second defluorination system, and achieves standard emission of small flue gas amount in non-aluminum industry by dry defluorination and dust removal through mutual cooperation of the four systems.
Wherein, the first defluorination system comprises an alumina storage tank 1, a first air extraction chamber 2, a first air lock 3, a manual gate valve, a first mixer 4, a spray gun 5, a second air extraction chamber 8, a second air lock 9, a manual gate valve, a second mixer 10, a venturi tube reactor 12, a flue 6, a pneumatic transmission pipeline and the like. The first defluorination system is used for introducing alumina powder, compressed air and flue gas into the venturi tube reactor 12, and removing fluoride in the flue gas through the adsorption action of the alumina powder and the flue gas.
The dust removal system comprises a bag-type dust remover, a return air chute 1301, a fluorine-carrying alumina circulation regulating valve, a third air extraction chamber 19, a third air locker 20, a manual gate valve, a Roots blower 14, an HF detector 17 and the like. The dust removal system is used for purifying the gas purified by the first defluorination system and the fluorine-carrying Al2O3Gas-solid separation is carried out, and the alumina powder is subjected to adsorption reaction with unreacted HF gas and fluoride gas (fluosilicic acid).
The second defluorination system comprises a fluorine-carrying alumina storage tank 18, a fourth extraction chamber 23, a fourth airlock 24, a fourth mixer 25 and the like. The second system of taking off fluorine is arranged in passing through the unloading valve with the year fluorine dust that the dust pelletizing system was collected to aluminium fluoride holding vessel, and the year fluorine alumina cycle who collects is used and is participated in the adsorption reaction, can effectively improve adsorption reaction efficiency.
The gas delivery system comprises a first compressed air delivery conduit 7, a second compressed air delivery conduit 11, a third compressed air delivery conduit 16, a fourth compressed air delivery conduit 22 and a fifth compressed air delivery conduit 26. Fresh alumina is sprayed into the series connection through a pneumatic conveying systemIn a spray gun 5 and a Venturi tube of a flue 6, fresh alumina reacts with HF gas in flue gas to produce AlF3And water.
Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The dry defluorination and dust removal flue gas purification system is characterized by comprising: the device comprises an alumina storage tank (1), a Venturi tube reactor (12), a flue (6), a dust remover (13), a Roots blower (14) and bittern smoke (15); the bottom end of the alumina storage tank (1) is provided with a first feed opening (101) and a second feed opening (102);
the first feed opening (101) is sequentially communicated with a first air extraction chamber (2), a first air locker (3), a first mixer (4) and a spray gun (5), the first mixer (4) is communicated with a first compressed air conveying pipeline (7), and an outlet of the spray gun (5) is communicated with a flue (6); a flue (6) positioned behind the outlet of the spray gun (5) is sequentially communicated with a venturi tube reactor (12), a dust remover (13), a Roots blower (14) and bittern (15);
the second feed opening (102) is sequentially communicated with a second air extracting chamber (8), a second air locking device (9) and a second mixer (10), the second mixer (10) is communicated with a second compressed air conveying pipeline (11), and an outlet of the second mixer (10) is communicated with the venturi tube reactor (12).
2. The system for the purification of flue gas by dry defluorination and dust removal according to claim 1, wherein said venturi reactor (12) is connected with a third compressed air delivery pipe (16).
3. The dry defluorination and dust removal flue gas purification system according to the claim 1, wherein an HF detector (17) is arranged on the flue (6) between the dust remover (13) and the Roots blower (14).
4. The dry defluorination and dust removal flue gas purification system according to claim 1, further comprising a fluorine-carrying alumina storage tank (18), wherein a third air extraction chamber (19), a third air lock (20), a third mixer (21) and the fluorine-carrying alumina storage tank (18) are sequentially communicated with a discharge port of the dust remover (13); a fourth compressed air conveying pipeline (22) is communicated with the third mixer (21);
the discharge hole of the fluorine-carrying aluminum oxide storage tank (18) is sequentially communicated with a fourth air extraction chamber (23), a fourth air locker (24) and a fourth mixer (25), the outlet of the fourth mixer (25) is communicated with the Venturi tube reactor (12), and a fifth compressed air conveying pipeline (26) is communicated with the fourth mixer (25).
5. The system for the purification of flue gas by dry defluorination and dust removal according to claim 1, wherein said dust remover (13) is a cloth bag dust remover.
6. A dry-method defluorination dust removal flue gas purification method is characterized by comprising the following steps:
step 1, mixing alumina powder in an alumina storage tank and compressed air in a first compressed air conveying pipeline through a first mixer, and then conveying the mixture into a spray gun, spraying the mixed substances into a flue through the spray gun, adsorbing the substances with smoke in the flue to form fluorine-carrying alumina, and feeding the fluorine-carrying alumina into a venturi tube reactor through the flue;
step 2, mixing the alumina powder in the alumina storage tank and the compressed air in the second compressed air conveying pipeline through a second mixer, and then conveying the mixture into the venturi tube reactor;
step 3, fully adsorbing the fluorine-carrying aluminum oxide and the aluminum oxide powder with the flue gas in the Venturi tube reactor to obtain the defluorinated flue gas and the fluorine-carrying aluminum oxide;
step 4, the defluorinated flue gas and the fluorine-carrying alumina are sent into a dust remover for gas-solid separation to obtain purified gas; the purified gas is discharged from the smoke furnace, and the solid is discharged from a discharge hole of the dust remover and collected.
7. The method for purifying the dry defluorination dust removal flue gas as claimed in claim 6, wherein in the step 1, the flow velocity of the flue gas in the flue is 15-22 m/s, and the temperature in the flue is 120-150 ℃.
8. The dry defluorination and dust removal flue gas purification method according to claim 6, further comprising a step 5, wherein the solids discharged from the discharge port of the dust remover and the compressed air in the fourth compressed air delivery pipeline are mixed by a third mixer and then sent into the fluorine-carrying alumina storage tank, and the substances discharged from the outlet of the fluorine-carrying alumina storage tank and the compressed air in the fifth compressed air delivery pipeline are mixed by a fourth mixer and then sent into the venturi reactor for adsorption.
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| CN201911016479.7A Pending CN110756038A (en) | 2019-10-24 | 2019-10-24 | Dry-method defluorination and dust removal flue gas purification system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111514722A (en) * | 2020-04-29 | 2020-08-11 | 陕西中节能环保科技有限公司 | Integrated treatment system and method for defluorination, dust removal, desulfurization and denitrification of industrial kiln flue gas |
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| US4213945A (en) * | 1977-03-02 | 1980-07-22 | Dr. C. Otto & Comp. G.M.B.H. | Process and apparatus to purify waste industrial gases |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111514722A (en) * | 2020-04-29 | 2020-08-11 | 陕西中节能环保科技有限公司 | Integrated treatment system and method for defluorination, dust removal, desulfurization and denitrification of industrial kiln flue gas |
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Application publication date: 20200207 |