CN112870918A - Processing system and method - Google Patents
Processing system and method Download PDFInfo
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- CN112870918A CN112870918A CN202110057431.1A CN202110057431A CN112870918A CN 112870918 A CN112870918 A CN 112870918A CN 202110057431 A CN202110057431 A CN 202110057431A CN 112870918 A CN112870918 A CN 112870918A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
- B01D53/10—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds with dispersed adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention provides a treatment system and a treatment method, which are used for treating smelting flue gas and comprise a removal mechanism, a cooling mechanism, a treatment mechanism and a recovery mechanism, wherein the removal mechanism comprises a first dust remover provided with a switching valve, the switching valve guides active carbon collected in the first dust remover into a smelting furnace or a reaction tower again, the treatment mechanism comprises a second dust remover provided with a detection device, and the detection device detects gas discharged by the second dust remover and feeds back the result to the treatment mechanism. According to the system and the method for treating the flue gas, the switching valve leads the activated carbon collected in the first dust remover to be reintroduced into the smelting furnace or the reaction tower, so that the treatment efficiency is improved, the detection device enables the treatment process to adjust the addition of the reactant according to the tail gas emission standard, and the problems that in the prior art, the addition of the reactant cannot be adjusted according to the tail gas emission standard during the treatment of the smelting flue gas, and in addition, the activated carbon after reaction is not recycled, so that the treatment cost of the flue gas is high and the treatment efficiency is low are solved.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a treatment system and a treatment method.
Background
With the rapid development of electronic information technology, when electronic products are produced in the electronic information industry, a large amount of copper-containing waste such as waste circuit boards is also produced, and when the copper-containing waste is recovered by using a smelting furnace, a large amount of smelting smoke is produced, and if the smelting smoke is not effectively treated, the smelting smoke can cause great harm to the environment.
The smelting flue gas generated by the smelting furnace is complex high-temperature dust-containing flue gas containing hydrogen chloride, hydrogen bromide, sulfur dioxide, nitrogen oxide and dioxin.
In the prior art, the addition of reactants cannot be adjusted according to the standard of discharged tail gas in the treatment of smelting flue gas, and in addition, activated carbon after reaction is not recycled, so that the treatment cost of the flue gas is high and the efficiency is low.
Disclosure of Invention
Based on this, the invention aims to provide a treatment system and a treatment method, which are used for solving the problems that in the prior art, the treatment cost of the flue gas is high and the efficiency is low because the addition of reactants cannot be adjusted according to the standard of the discharged tail gas and the activated carbon after the reaction is not recovered.
The invention provides a treatment system for treating smelting flue gas, which comprises a removal mechanism, a cooling mechanism connected to one end of the removal mechanism, a treatment mechanism connected to the other end of the removal mechanism, and a recovery mechanism respectively connected with the cooling mechanism and the treatment mechanism, wherein the removal mechanism comprises a reaction tower, a first dust remover connected to one end of the reaction tower, and an active carbon injection device connected to the other end of the reaction tower, the active carbon injection device provides active carbon required by the work for the reaction tower, the first dust remover is connected with the treatment mechanism, the bottom of the first dust remover is provided with a switching valve, the switching valve is respectively connected with a smelting furnace and the reaction tower, and the active carbon collected in the first dust remover is reintroduced into the smelting furnace or the reaction tower, the treatment mechanism comprises a second dust remover, the top of the second dust remover is provided with a detection device, the detection device detects the gas discharged by the second dust remover and feeds back the result to the processing mechanism, the removal mechanism further comprises a quenching tower, one end of the quenching tower is connected to the cooling mechanism, and the other end of the quenching tower is connected to the reaction tower.
The invention also provides a flue gas treatment method, which adopts the treatment system and comprises the following steps:
the smelting flue gas is cooled by the waste heat boiler to form first flue gas and first smoke dust;
the first flue gas is dedusted by the third deduster to form first dedusting gas and second smoke dust;
the first dedusting gas enters the quenching tower, and cooling liquid is input into the quenching tower from the outside and forms first cooling gas after being cooled with the first dedusting gas;
the first cooling gas enters the reaction tower, the activated carbon spraying device sprays activated carbon into the reaction tower through a first fan and a Venturi ejector, the activated carbon is mixed with the first cooling gas to remove toxic substances in the activated carbon, a second dedusting gas and activated carbon containing the toxic substances are formed, and the activated carbon containing the toxic substances is dedusted and collected through the first deduster;
opening a switching valve, and enabling the activated carbon collected by the first dust remover to reenter the reaction tower through a conveyor or enter a smelting furnace to be used as fuel again;
the second dedusting gas passes through the first deduster, is blown into the flue gas mixer through a second fan, and is sent into the washing tower through the flue gas mixer;
the ozone generated by the ozone generator is sprayed into the flue gas mixer through the ozone distributing device, is mixed with the second dedusting gas to be oxidized into high-order nitrogen oxides, and then is sent into the washing tower;
pumping the alkali liquor in the alkali liquor tank into the washing tower through the delivery pump, and reacting with the high-order nitrogen oxide to form washing liquid and first clean gas;
the cleaning solution is discharged into the recovery device through the discharge pump for recovery, and the first clean gas enters a second dust remover from bottom to top for treatment to form second clean gas;
detecting whether the second clean gas meets the standard through a detection device, and determining to increase or decrease the addition of the alkali liquor and the ozone according to the detection condition;
and the first smoke dust and the second smoke dust enter a leaching tank through a first conveyor and a second conveyor to be mixed, reaction liquid in the leaching tank reacts, and then a bromine salt is formed through a filter press, and the bromine salt enters a recovery device to recover bromine.
According to the system and the method for treating the flue gas, the switching valve is arranged on the first dust remover, so that the activated carbon collected in the first dust remover is led into the smelting furnace or the reaction tower again, the treatment efficiency is improved, further, the detection device is arranged on the second dust remover, the addition amount of the reactant can be adjusted according to the tail gas emission standard in the treatment process, and the problems that in the prior art, the addition amount of the reactant cannot be adjusted according to the tail gas standard of emission in the treatment of the smelting flue gas, in addition, the activated carbon after reaction is not recovered, the treatment cost of the flue gas is high, and the efficiency is low are solved.
Further, desorption mechanism still includes first fan, the active carbon injection device includes the active carbon feed bin, locates the measuring conveyer, the venturi sprayer of the bottom of active carbon feed bin, the one end of venturi sprayer even in measuring conveyer, the other end are connected first fan.
Furthermore, the treatment mechanism further comprises a washing device and an ozone denitration device connected to one end of the washing device, the second dust remover is connected to the other end of the washing device, the ozone denitration device is connected with the first dust remover, the washing device comprises a washing tower and a plurality of working pumps, and the working pumps are communicated with the washing tower.
Further, the ozone denitration device comprises an ozone gas distribution device, an ozone generator connected with one end of the ozone gas distribution device, and a flue gas mixer connected with the other end of the ozone gas distribution device, the processing mechanism further comprises a second fan, one end of the second fan is connected with the first dust remover, and the other end of the second fan is connected with the flue gas mixer.
Furthermore, the washing tower is provided with a lye tank, and the working pump comprises a delivery pump, a circulating pump and a discharge pump, wherein the delivery pump is connected with the lye tank, and the discharge pump is connected with the recovery mechanism.
Furthermore, the cooling mechanism comprises a waste heat boiler and a third dust remover which are communicated with each other, a first conveyor and a second conveyor are respectively arranged at the bottoms of the waste heat boiler and the third dust remover, the first conveyor and the second conveyor are both connected with the recovery mechanism, one end of the third dust remover is connected with the waste heat boiler, and the other end of the third dust remover is connected with the quenching tower.
Further, retrieve the mechanism and include leaching device and recovery unit, leaching device includes leaching tank and pressure filter, leaching tank connects first conveyer with the second conveyer, the pressure filter with recovery unit links to each other.
Further, the recovery device comprises a bromine recovery device, and the bromine recovery device is respectively connected with the filter press and the discharge pump.
Drawings
FIG. 1 is a schematic diagram of a processing system according to a first embodiment of the present invention;
FIG. 2 is a schematic structural view of a removing mechanism in the first embodiment of the present invention;
FIG. 3 is a schematic structural view of a cooling mechanism according to a first embodiment of the present invention;
FIG. 4 is a schematic structural view of a processing mechanism according to a first embodiment of the present invention;
FIG. 5 is a schematic structural view of an ozone denitration apparatus according to a first embodiment of the present invention;
FIG. 6 is a schematic structural view of a recovery mechanism according to a first embodiment of the present invention;
FIG. 7 is a flow chart of a processing method according to a second embodiment of the present invention;
description of the main element symbols:
| removing |
100 | |
221 |
| |
200 | |
310 |
| |
300 | |
320 |
| |
400 | |
330 |
| |
110 | |
311 |
| |
120 | Lye |
321 |
| Activated |
130 | |
322 |
| |
140 | Circulating |
323 |
| |
121 | |
324 |
| |
122 | Ozone |
331 |
| |
150 | |
332 |
| Activated |
131 | |
333 |
| |
132 | |
334 |
| Venturi |
133 | |
410 |
| |
210 | |
420 |
| |
220 | |
411 |
| |
211 | |
412 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, there is shown a treatment system according to a first embodiment of the present invention, which comprises a removing mechanism 100, a cooling mechanism 200 connected to one end of the removing mechanism 100, and a treatment mechanism 300 connected to the other end of the removing mechanism 100, respectively, and a recycling mechanism 400, wherein the recycling mechanism 400 is connected to the cooling mechanism 200 and the treatment mechanism 300, respectively. As can be appreciated, the interconnection of each mechanism can make the treatment process continuous and the operation steps simpler.
Referring to fig. 2, which is a schematic view illustrating a removing mechanism according to a first embodiment of the present invention, the removing mechanism 100 includes a reaction tower 110, a first dust remover 120 connected to one end of the reaction tower 110, and an activated carbon injector 130 connected to the other end of the reaction tower 110, the activated carbon injector 130 supplies activated carbon required for operation to the reaction tower 110, the first dust remover 120 is connected to a processing mechanism 300, and has a switching valve 121 at the bottom, the switching valve 121 is connected to the smelting furnace and the reaction tower 110, respectively, and reintroduces the activated carbon collected in the first dust remover 120 into the smelting furnace or the reaction tower 110, the removing mechanism 100 further includes a quenching tower 140, one end of the quenching tower 140 is connected to a cooling mechanism 200, and the other end is connected to the reaction tower 110.
In this embodiment, the removing mechanism further comprises a first fan 150, and the activated carbon injection device 130 comprises an activated carbon bin 131, a metering conveyor 132, and a venturi injector 133. The venturi eductor 133 is connected at one end to the metering conveyor 132 and at the other end to the first fan 150. As can be understood, the metering conveyor 132 sends the activated carbon in the activated carbon bin 131 into the venturi ejector 133, and the activated carbon is sprayed into the reaction tower through the venturi ejector 133, so that an activated carbon layer is formed on the surface of the filter element of the first dust remover 120, and dioxin in the flue gas is better adsorbed; the activated carbon collected by the first dust remover 120 can be circulated into the reaction tower for multiple times through the switching valve 121, so that the use efficiency of the activated carbon is improved, and the activated carbon after the multiple circulation can be returned to the smelting furnace to be used as fuel, so that the cost of flue gas treatment is reduced, and the efficiency of flue gas treatment is improved.
Referring to fig. 3, which is a schematic structural diagram of a cooling mechanism according to a first embodiment of the present invention, a cooling mechanism 200 includes a waste heat boiler 210 and a third dust collector 220 that are communicated with each other, a first conveyor 211 and a second conveyor 221 are respectively disposed at bottoms of the waste heat boiler 210 and the third dust collector 220, the first conveyor 211 and the second conveyor 221 are both connected to a recovery mechanism 400, one end of the third dust collector 220 is connected to the waste heat boiler 210, and the other end is connected to a quenching tower 140. It can be understood that smelting flue gas generated in the smelting furnace is cooled by the waste heat boiler 210, enters the third dust remover 220 for dust removal, and then enters the quenching tower 140 for quenching operation, and the first conveyor 211 and the second conveyor 221 can more conveniently convey smoke dust in the waste heat boiler 210 and the third dust remover 220 to the recovery mechanism 400.
Referring to fig. 4 and 5, which are schematic structural diagrams illustrating a processing mechanism and an ozone denitration device according to a first embodiment of the present invention, the processing mechanism 300 includes a second precipitator 310, a detection device 311 is disposed on a top of the second precipitator 310, the detection device 311 detects gas discharged from the second precipitator 310 and feeds back the result to the processing mechanism 300, the processing mechanism 300 further includes a washing device, an ozone denitration device 330 connected to one end of the washing device, the second precipitator 310 is connected to the other end of the washing device, the ozone denitration device 330 is connected to the first precipitator 120, the washing device includes a washing tower 320 and a plurality of working pumps, and the working pumps are communicated with the washing tower 320. It can be understood that detection device 311 detects the sulfur dioxide of emission, nitrogen oxide, hydrogen chloride, the content of hydrogen bromide, the addition of alkali lye in the decision scrubbing tower, from this can the pertinence add alkali lye, avoid excessive addition alkali lye, cause the waste, the running cost has been reduced, the nitrogen oxide content that detects according to detection device 311 decides the injection volume of ozone, from this can the pertinence spout ozone, avoid excessive spout ozone, cause the waste, further reduction the running cost.
Specifically, the washing column 320 is provided with a lye tank 321, and the working pump includes a transfer pump 322 connected to the lye tank 321, a circulation pump 323, and a discharge pump 324 connected to the recovery mechanism 400. It can be understood that the circulating pump 323 can circulate the alkali liquor in the washing tower 320 for multiple reactions, which improves the utilization rate of the alkali liquor, thereby reducing the cost of flue gas treatment and improving the efficiency of flue gas treatment.
Further, the ozone denitration device 330 includes an ozone distribution device 331, an ozone generator 332 connected to one end of the ozone distribution device 331, and a flue gas mixer 333 connected to the other end of the ozone distribution device 331, the ozone denitration device 330 further includes a second fan 334, one end of the second fan 334 is connected to the first dust remover 120, and the other end is connected to the flue gas mixer 333, it can be understood that the second fan 334 blows the ozone generated by the ozone generator 332 into the flue gas mixer 333, and then enters the washing tower 320, so that the nitrogen oxide in the flue gas is oxidized into high-valence nitrogen oxide more quickly, and the reaction with the alkali liquor in the washing tower 320 is facilitated.
Referring to fig. 6, which is a schematic structural diagram of a recycling mechanism according to a first embodiment of the present invention, the recycling mechanism 400 includes a leaching device 410 and a recycling device 420, the leaching device 410 includes a leaching tank 411 and a filter press 412, the leaching tank 411 is connected to the first conveyor 211 and the second conveyor 221, the filter press 412 is connected to the recycling device 420, the recycling device 420 includes a bromine recycling device, and the bromine recycling device is connected to the exhaust pump 324, it can be understood that the leaching tank 411 is used for leaching bromine salts in the flue dust collected by the waste heat boiler 210 and the third dust collector 220, and the bromine recycling device can recycle the washing liquid discharged from the washing tower 320 through the exhaust pump 324 more quickly.
In this embodiment, preferably, the first dust collector 120 is one of a bag dust collector, a ceramic filter dust collector and a filter cartridge dust collector; the second dust collector 310 is a wet electric dust collector; the third dust collector 220 is one of a high-temperature metal filter dust collector, a high-temperature ceramic filter dust collector, and a high-temperature electrostatic bag dust collector.
In summary, in the processing system in the above embodiment of the present invention, the switching valve is disposed on the first dust remover, so that the activated carbon collected in the first dust remover is reintroduced into the smelting furnace and the reaction tower, thereby improving the processing efficiency, and further, the detection device is disposed on the second dust remover, so that the addition amount of the reactant can be adjusted according to the exhaust emission standard during the processing process, thereby solving the problems in the prior art that the addition amount of the reactant cannot be adjusted according to the exhaust emission standard during the processing of the smelting flue gas, and in addition, the activated carbon after the reaction is not recovered, so that the processing cost of the flue gas is high and the efficiency is low.
Referring to fig. 7, a processing method according to a second embodiment of the present invention is shown, in which the processing system is adopted, and the method includes:
s101, cooling smelting flue gas by a waste heat boiler to form first flue gas and first smoke dust;
in the steps, the smelting flue gas is sent into a waste heat boiler 100 to be cooled to 500-650 ℃ to obtain first flue gas; the temperature is controlled to be 500-650 ℃, and the secondary synthesis temperature of the dioxin in the flue gas can be avoided on the basis of maximally utilizing the heat energy of the flue gas.
S102, dedusting the first flue gas by a third deduster to form first dedusting gas and second flue dust;
in the steps, after the third dust remover is used for removing the smoke dust in the first flue gas, the catalytic action of the smoke dust on the secondary synthesis of the dioxin can be effectively avoided, the secondary synthesis of the dioxin in the subsequent flue gas cooling process is inhibited, the situation that the smoke dust blocks the pores of the activated carbon is avoided, and the adsorption effect of the activated carbon in the subsequent reaction tower and the second dust remover is improved.
S103, feeding the first dust removal gas into a quenching tower, inputting cooling liquid into the quenching tower from the outside, and cooling the cooling liquid and the first dust removal gas to form first cooling gas;
in the steps, the first dedusting gas is sent into a quenching tower, cooling liquid is sprayed into the quenching tower from the outside, and the temperature of the flue gas is reduced from 500-650 ℃ to 150-200 ℃ within 1 second.
S104, enabling the first cooling gas to enter a reaction tower, enabling an activated carbon spraying device to spray activated carbon into the reaction tower through a first fan and a Venturi ejector, mixing the activated carbon with the first cooling gas to remove toxic substances in the activated carbon, and forming second dedusting gas and activated carbon containing the toxic substances, wherein the activated carbon containing the toxic substances is dedusted and collected by a first deduster;
in the above steps, the first cooling gas enters the reaction tower, and the first cooling gas and the activated carbon are fully contacted in the reaction tower and the first dust remover through the sprayed activated carbon to remove dioxin in the flue gas, and then the activated carbon adsorbed with dioxin is removed in the first dust remover to obtain second dust removal gas; through rapid cooling and almost no smoke dust in the first cooling gas, the first cooling gas quickly crosses over the secondary synthesis temperature of the dioxin, and the secondary synthesis of the dioxin is effectively avoided; the sprayed activated carbon is fully contacted with the first cooling gas in the reaction tower and the first dust remover to adsorb dioxin in the first cooling gas, and because the first cooling gas does not contain dust basically, the activated carbon is sprayed, so that an activated carbon layer is formed on the surface of the filter element of the first dust remover to better adsorb the dioxin in the flue gas.
S105, opening a switching valve, and enabling the activated carbon collected by the first dust remover to reenter the reaction tower through a conveyor or be used as fuel in the smelting furnace;
in the above steps, the activated carbon collected by the first dust remover can be recycled to the reaction tower for many times through the switching valve, so that the use efficiency of the activated carbon is improved, and the activated carbon after being recycled for many times is returned to the smelting furnace to be used as fuel.
S106, the second dedusting gas passes through the first deduster, is blown into the flue gas mixer through a second fan, and is sent into the washing tower through the flue gas mixer;
in the above steps, the second dedusting gas enters the washing device for washing under the suction of the second fan, and the acidic components such as sulfur dioxide, hydrogen chloride, hydrogen bromide, nitrogen oxide and the like in the second dedusting gas are removed.
S107, spraying ozone generated by an ozone generator into the flue gas mixer through an ozone gas distribution device, mixing the ozone with second dedusting gas to be oxidized into high-order nitrogen oxide, and then sending the high-order nitrogen oxide into the washing tower;
in the above step, the ozone generator sprays ozone into the second dedusting gas, so as to oxidize the low-valent nitrogen oxides in the second dedusting gas into high-valent nitrogen oxides, such as nitrogen dioxide and dinitrogen pentoxide, so as to react with the alkali liquor in the washing device for removal.
S108, pumping the alkali liquor in the alkali liquor tank into the washing tower through a delivery pump, and reacting with the high-order nitrogen oxide to form washing liquid and first clean gas;
s109, discharging the cleaning solution into a recovery device through a discharge pump for recovery, and allowing the first clean gas to enter a second dust remover from bottom to top for treatment to form second clean gas;
in the above steps, the first clean gas is sent into the second dust remover to remove small liquid drops carried by the first clean gas, and a second clean gas is obtained. The second dust remover is used for removing small liquid drops in the flue gas, so that the first clean gas can be further purified, and bromine carried by the small liquid drops can be recovered.
S110, detecting whether the second clean gas meets the standard through a detection device, and determining to increase or decrease the addition of the alkali liquor and the ozone according to the detection condition;
in the above steps, the adding amount of the alkali liquor in the washing tower is determined according to the contents of the sulfur dioxide, the nitrogen oxide, the hydrogen chloride and the hydrogen bromide discharged by the detection device, so that the alkali liquor can be added in a targeted manner, excessive addition of the alkali liquor is avoided, waste is caused, the operation cost is reduced, the spraying amount of the ozone is determined according to the content of the nitrogen oxide detected by the detection device, the ozone can be sprayed in a targeted manner, excessive spraying of the ozone is avoided, waste is caused, and the operation cost is further reduced.
And S111, the first smoke dust and the second smoke dust enter a leaching tank through a first conveyor and a second conveyor to be mixed, reaction liquid in the leaching tank reacts, then bromine salt is formed through a filter press, and the bromine salt enters a recovery device to be recovered.
In the above steps, the first smoke dust and the second smoke dust collected by the exhaust-heat boiler and the third dust remover are sent to the leaching device through the first conveyor and the second conveyor, and after the smoke dust is leached in the leaching tank of the leaching device, the solid-liquid separation is carried out through the filter press to obtain leaching liquid; and (4) feeding the leachate and the washing liquid of the washing device into a bromine recovery device to recover bromine.
In summary, in the processing method in the above embodiments of the present invention, the switching valve is disposed on the first dust remover, so that the activated carbon collected in the first dust remover is reintroduced into the smelting furnace or the reaction tower, thereby improving the processing efficiency, and further, the detection device is disposed on the second dust remover, so that the addition amount of the reactant can be adjusted according to the exhaust emission standard during the processing process, thereby solving the problems in the prior art that the addition amount of the reactant cannot be adjusted according to the exhaust emission standard during the processing of the smelting flue gas, and in addition, the activated carbon after the reaction is not recovered, so that the processing cost of the flue gas is high and the efficiency is low.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A treatment system for treating smelting flue gas is characterized by comprising a removal mechanism, a cooling mechanism connected to one end of the removal mechanism, a treatment mechanism connected to the other end of the removal mechanism, and a recovery mechanism respectively connected with the cooling mechanism and the treatment mechanism, wherein the removal mechanism comprises a reaction tower, a first dust remover connected to one end of the reaction tower, and an activated carbon injection device connected to the other end of the reaction tower, the activated carbon injection device provides activated carbon required by work for the reaction tower, the first dust remover is connected with the treatment mechanism, a switching valve is arranged at the bottom of the first dust remover, the switching valve is respectively connected with a smelting furnace and the reaction tower, and reintroduces the activated carbon collected in the first dust remover into the smelting furnace or the reaction tower, the treatment mechanism comprises a second dust remover, a detection device is arranged at the top of the second dust remover, the detection device detects the gas discharged by the second dust remover and feeds back the result to the processing mechanism, the removal mechanism further comprises a quenching tower, one end of the quenching tower is connected to the cooling mechanism, and the other end of the quenching tower is connected to the reaction tower.
2. The processing system of claim 1, wherein the removal mechanism further comprises a first fan, the activated carbon injection device comprises an activated carbon bin, a metering conveyor arranged at the bottom of the activated carbon bin, and a venturi injector, one end of the venturi injector is connected to the metering conveyor, and the other end of the venturi injector is connected to the first fan.
3. The treatment system of claim 2, wherein said treatment means further comprises a scrubber, an ozone denitrator connected to one end of said scrubber, said second precipitator connected to the other end of said scrubber, said ozone denitrator connected to said first precipitator, said scrubber comprising a scrubber tower and a plurality of working pumps, said working pumps being in communication with said scrubber tower.
4. The treatment system of claim 3, wherein the ozone denitration device comprises an ozone distribution device, an ozone generator connected to one end of the ozone distribution device, and a flue gas mixer connected to the other end of the ozone distribution device, and the treatment mechanism further comprises a second fan, one end of the second fan is connected to the first dust remover, and the other end of the second fan is connected to the flue gas mixer.
5. The treatment system according to claim 4, wherein the washing tower is provided with a lye tank, and the working pump comprises a transfer pump connected to the lye tank, a circulation pump, and a discharge pump connected to the recovery mechanism.
6. The treatment system according to any one of claims 1 to 5, wherein the cooling mechanism comprises a waste heat boiler and a third dust remover which are communicated with each other, a first conveyor and a second conveyor are respectively arranged at the bottoms of the waste heat boiler and the third dust remover, the first conveyor and the second conveyor are both connected with the recovery mechanism, one end of the third dust remover is connected with the waste heat boiler, and the other end of the third dust remover is connected with the quenching tower.
7. The treatment system of claim 6, wherein the recovery mechanism comprises a leaching device and a recovery device, the leaching device comprises a leaching tank and a filter press, the leaching tank is connected with the first conveyor and the second conveyor, and the filter press is connected with the recovery device.
8. The treatment system of claim 7, wherein the recovery device comprises a bromine recovery device, the bromine recovery device being connected to the filter press and the drain pump, respectively.
9. A method for treating flue gas, using the treatment system of any one of claims 1 to 8, the method comprising:
the smelting flue gas is cooled by the waste heat boiler to form first flue gas and first smoke dust;
the first flue gas is dedusted by the third deduster to form first dedusting gas and second smoke dust;
the first dedusting gas enters the quenching tower, and cooling liquid is input into the quenching tower from the outside and forms first cooling gas after being cooled with the first dedusting gas;
the first cooling gas enters the reaction tower, the activated carbon spraying device sprays activated carbon into the reaction tower through a first fan and a Venturi ejector, the activated carbon is mixed with the first cooling gas to remove toxic substances in the activated carbon, a second dedusting gas and activated carbon containing the toxic substances are formed, and the activated carbon containing the toxic substances is dedusted and collected through the first deduster;
opening a switching valve, and enabling the activated carbon collected by the first dust remover to reenter the reaction tower through a conveyor or enter a smelting furnace to be used as fuel again;
the second dedusting gas passes through the first deduster, is blown into the flue gas mixer through a second fan, and is sent into the washing tower through the flue gas mixer;
the ozone generated by the ozone generator is sprayed into the flue gas mixer through the ozone distributing device, is mixed with the second dedusting gas to be oxidized into high-order nitrogen oxides, and then is sent into the washing tower;
pumping the alkali liquor in the alkali liquor tank into the washing tower through the delivery pump, and reacting with the high-order nitrogen oxide to form washing liquid and first clean gas;
the cleaning solution is discharged into the recovery device through the discharge pump for recovery, and the first clean gas enters a second dust remover from bottom to top for treatment to form second clean gas;
detecting whether the second clean gas meets the standard through a detection device, and determining to increase or decrease the addition of the alkali liquor and the ozone according to the detection condition;
and the first smoke dust and the second smoke dust enter a leaching tank through a first conveyor and a second conveyor to be mixed, reaction liquid in the leaching tank reacts, and then a bromine salt is formed through a filter press, and the bromine salt enters a recovery device to recover bromine.
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| CN202110057431.1A CN112870918A (en) | 2021-01-15 | 2021-01-15 | Processing system and method |
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| CN202110057431.1A CN112870918A (en) | 2021-01-15 | 2021-01-15 | Processing system and method |
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