CN113332843A - Process for deodorizing and deslagging casting flue gas - Google Patents
Process for deodorizing and deslagging casting flue gas Download PDFInfo
- Publication number
- CN113332843A CN113332843A CN202110542034.3A CN202110542034A CN113332843A CN 113332843 A CN113332843 A CN 113332843A CN 202110542034 A CN202110542034 A CN 202110542034A CN 113332843 A CN113332843 A CN 113332843A
- Authority
- CN
- China
- Prior art keywords
- absorption tower
- medicament
- gas
- deslagging
- deodorizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000003546 flue gas Substances 0.000 title claims abstract description 31
- 238000005266 casting Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 22
- 230000001877 deodorizing effect Effects 0.000 title claims abstract description 20
- 238000010521 absorption reaction Methods 0.000 claims abstract description 118
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000007789 gas Substances 0.000 claims abstract description 68
- 239000003814 drug Substances 0.000 claims abstract description 61
- 239000003595 mist Substances 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 239000007921 spray Substances 0.000 claims abstract description 38
- 238000012856 packing Methods 0.000 claims abstract description 32
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 25
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000945 filler Substances 0.000 claims abstract description 23
- 238000001179 sorption measurement Methods 0.000 claims abstract description 23
- 238000005507 spraying Methods 0.000 claims abstract description 20
- 239000000779 smoke Substances 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 238000004332 deodorization Methods 0.000 claims abstract description 11
- 239000002699 waste material Substances 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims description 15
- 239000003054 catalyst Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000002808 molecular sieve Substances 0.000 claims description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 4
- 239000003517 fume Substances 0.000 claims 5
- 238000000889 atomisation Methods 0.000 abstract description 5
- 239000000428 dust Substances 0.000 description 22
- 238000011282 treatment Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 13
- 239000000126 substance Substances 0.000 description 10
- 239000010815 organic waste Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 150000001555 benzenes Chemical class 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- QPUYECUOLPXSFR-UHFFFAOYSA-N 1-methylnaphthalene Chemical compound C1=CC=C2C(C)=CC=CC2=C1 QPUYECUOLPXSFR-UHFFFAOYSA-N 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 150000002576 ketones Chemical class 0.000 description 2
- 150000002632 lipids Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- GJCOSYZMQJWQCA-UHFFFAOYSA-N 9H-xanthene Chemical compound C1=CC=C2CC3=CC=CC=C3OC2=C1 GJCOSYZMQJWQCA-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 150000002240 furans Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- QDLAGTHXVHQKRE-UHFFFAOYSA-N lichenxanthone Natural products COC1=CC(O)=C2C(=O)C3=C(C)C=C(OC)C=C3OC2=C1 QDLAGTHXVHQKRE-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- 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
-
- 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
- B01D53/79—Injecting reactants
-
- 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
- B01D53/86—Catalytic processes
- B01D53/864—Removing carbon monoxide or hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
- B01D2257/7027—Aromatic hydrocarbons
-
- 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
- B01D2258/025—Other waste gases from metallurgy plants
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a casting flue gas deodorization and deslagging process, which comprises the following steps: atomizing and absorbing: the reagent solution is atomized by an atomization nozzle in the first absorption tower; the flue gas is adsorbed and reacted by the atomized medicament in the first absorption tower to form gas containing water mist; spray defogging: the reagent solution is sprayed by a spraying device arranged at the upper part of a multi-layer packing layer in a second absorption tower, and the treated water-containing mist enters from the bottom of the second absorption tower and is subjected to adsorption reaction and water mist removal by the reagents in and above the multi-layer packing layer to form benzene-containing gas; deodorizing: the benzene-containing gas is subjected to adsorption reaction by an adsorption filler in the deodorization device to form gas to be discharged; deslagging: the second absorption tower is conveyed back to the medicament tank through the bottom medicament solution; the medicament groove is provided with a separation net for preventing waste residue from entering a liquid inlet of the pump; the medicine solution in the medicine tank is circularly conveyed to the atomizing nozzle and the spraying device through the pump. The process can effectively treat the casting smoke and reach the emission standard.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment, and particularly relates to a process for deodorizing and deslagging casting flue gas.
Background
With the development of casting technology, resin sand molds such as self-hardening furan resin and phenolic resin sand are widely adopted in China for casting, so that the production period is shortened, the production efficiency is improved, and the appearance quality of castings is also improved. However, when the resin sand mold is cast and cooled, very dense smoke can be emitted, smoke components comprise smoke dust and CO due to baking of high-temperature molten aluminum, molten iron and molten steel, decomposed organic substances and resin oily volatile matters with high viscosity can be generated, the resin oily volatile matters and the smoke dust can be mixed to generate black greasy matters with very strong viscosity and high flammability, the black greasy matters can be easily adhered to the pipe wall of a ventilation dust removal pipeline and a filter bag of a bag type dust collector, resistance of the filter bag can be increased until the filter bag is blocked after a long time, and accordingly the filtering function is disabled. Therefore, in the casting industry of China, on a resin sand molding production line, the smoke of a pouring section and a cooling gallery is generally directly discharged by a fan without a dust remover, so that pollution transfer is caused, the indoor environment is cleaned, the atmosphere is polluted, and the emission does not reach the standard. The organic waste gas mixed in the air not only causes environmental pollution, but also harms human health, and the organic waste gas pollution in the casting production becomes one of the focus problems of industry attention. The method solves the problem of organic waste gas pollution in casting production by adopting an economic and effective method, and has important practical significance for sustainable development of casting industry and ecological civilization construction of China.
At present, the treatment problem of organic waste gas containing other components generated in a foundry (namely, smoke dust can be effectively filtered and harmful gas can be effectively treated) is not reported, and the organic waste gas pollution treatment work of the foundry is just started.
However, in the industries of petroleum, chemical industry, printing and the like, various economic and effective treatment methods are available for treating organic waste gas. However, due to the characteristics of low organic matter concentration and low gas production of organic waste gas in the casting industry, it is difficult to directly use the organic waste gas treatment methods in the industries.
Disclosure of Invention
The invention provides a process for deodorizing and deslagging casting flue gas, which can effectively treat harmful gas in the casting flue gas and waste residues generated by the harmful gas, and reaches the emission standard.
The technical scheme of the invention is as follows:
a process for deodorizing and deslagging casting flue gas comprises the following steps:
atomizing and absorbing: the medicament solution is atomized by an atomizing nozzle arranged at the upper part in the first absorption tower; the flue gas is subjected to adsorption reaction by the atomized medicament in the first absorption tower to form gas containing water mist;
spray defogging: the reagent solution is sprayed by a spraying device arranged at the upper part of a plurality of packing layers in a second absorption tower, and the water-containing mist gas treated by the first absorption tower enters from the bottom of the second absorption tower and is subjected to adsorption reaction and water mist removal by the reagents in and above the plurality of packing layers to form benzene-containing gas;
deodorizing: the benzene-containing gas passing through the second absorption tower is subjected to adsorption reaction by adsorption packing in the deodorization device to form gas to be discharged;
deslagging: the second absorption tower conveys the medicament solution back to the medicament groove through a liquid outlet arranged at the bottom; the medicament groove is internally provided with a separation net, and the liquid outlet and the liquid inlet of the pump are positioned at two sides of the separation net to prevent waste residues from entering the liquid inlet of the pump; and the medicament solution in the medicament tank is circularly conveyed to the atomizing nozzle and the spraying device through a pump.
Preferably, the bottom of the first absorption tower and/or the bottom of the second absorption tower are/is provided with a cyclone separator.
Preferably, the second absorption tower comprises a plurality of layers of packing layers arranged at intervals, and each layer of packing layer is correspondingly provided with different spray header devices.
Preferably, the spray header device comprises a fire-fighting spray header and a water mist nozzle, the water forms an umbrella-shaped water flow layer through the fire-fighting spray header, and the water forms a granular water mist or fog with the diameter of 0.01-0.15mm through the water mist nozzle.
Preferably, the upper part of the second absorption tower is provided with an air outlet, the lower part of the second absorption tower is provided with an air inlet, and the fire-fighting spray header is arranged above the uppermost layer of the packing of the second absorption tower.
Preferably, the water mist nozzle comprises a spiral nozzle and a solid cone nozzle; preferably, the spiral nozzle is disposed above the solid cone nozzle.
Preferably, the filler layer is selected from annular filler, spherical filler and water curtain filler, and is preferably water curtain filler.
Preferably, a plurality of the atomizer nozzles are arranged in the first absorption tower at intervals along the horizontal direction, a plurality of the atomizer nozzles are arranged at intervals along the vertical direction, and the atomizer nozzles are high-pressure nozzles.
Preferably, the number of the medicament tanks is one or more, the medicament solutions in the medicament tanks are the same or different, and the medicament solutions entering the first absorption tower and the second absorption tower from the medicament tanks are the same or different; a first liquid discharge port is formed in the bottom of the first absorption tower, and the medicine solution in the first absorption tower is conveyed to a second absorption tower or a medicine tank through the first liquid discharge port; and a second liquid outlet is formed in the bottom of the second absorption tower, and the medicine solution in the second absorption tower is conveyed to the medicine tank through the second liquid outlet.
Preferably, the adsorption filler filled in the deodorization device comprises activated carbon and a molecular sieve, and a normal-temperature catalyst is loaded in the adsorption filler.
Compared with the prior art, the invention has the following beneficial effects:
the process of the invention comprises the steps of treating cast flue gas through two absorption towers, a deodorization device and a reagent tank which are connected in series, and combining a top atomizer to form reagent spray from a reagent solution so as to be fully contacted with the flue gas, wherein on one hand, the reagent spray is contacted and reacts with gas in the flue gas to remove harmful gas, on the other hand, the reagent spray is contacted and condensed with dust to further reduce dust, and on the other hand, the second absorption tower is provided with different spray headers to further react and remove the harmful gas and a small amount of dust; the second absorption tower further absorbs and demists; removing unreacted benzene series in the first two wet absorption towers by a deodorization device to realize deodorization; the deslagging is realized by arranging a separation net in the medicament groove, and the recycling of the medicament is realized;
secondly, the dust is primarily separated at the bottom of the first absorption tower and/or the second absorption tower through a cyclone separator at the bottom of the tower, the gas forms spiral airflow, the gas flow rate is reduced, and the retention time is increased for subsequent atomization and dust removal;
the second absorption tower of the invention forms water flow to react with gas through a fire-fighting spray head by selecting different spray heads, and on the other hand, water mist can be removed through non-mist water flow adsorption; the fire sprinkler head is preferably arranged above the uppermost layer of packing (closer to the outlet than other sprinkler devices), preventing water mist from entering the subsequent stage; the water mist nozzle is adopted to form water mist or fog which can further contact and react with gas, so that the absorption effect is improved;
the solid nozzle is mainly in a fog shape and is used for reacting with gas, the spiral nozzle is mainly in a large-droplet water fog or water flow and large-droplet water fog and is used for reacting with the gas and adsorbing the water fog, static electricity is generated by the flow of the water body sprayed by the spiral nozzle to further demist, the spiral nozzle is arranged above the solid cone nozzle, and the spiral nozzle is preliminarily demisted and connected with a follow-up fire-fighting spray head to demist while absorption is enhanced, so that the demisting effect can be enhanced;
the filler of the invention is water curtain filler, liquid flows from top to bottom along the fiber shape on the filler after dropping on the water curtain filler, a layer of water film is formed integrally, and simultaneously, the liquid is contacted with the entering gas, thus the full contact of gas and liquid can be realized, and the gas pressure passing through the water curtain is reduced, thereby the requirement of the power of the fan is low, and the running cost is low.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
FIG. 1 is a flow chart of the deodorizing and deslagging process of the casting flue gas in the embodiment of the utility model;
FIG. 2 is a schematic structural diagram of a first absorption tower according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a second absorption tower according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of another second absorption tower according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a spraying device of the second absorption tower according to the embodiment of the present invention;
fig. 6 is a schematic structural view of another spraying device of the second absorption tower according to the embodiment of the present invention;
fig. 7 is a schematic structural view of another spraying device of the second absorption tower according to the embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. In practice, the invention will be understood to cover all modifications and variations of this invention provided they come within the scope of the appended claims.
For a better illustration of the invention, the invention is described in detail below with reference to the accompanying figures 1-7.
Examples
Referring to fig. 1, a process for deodorizing and deslagging casting flue gas comprises the following steps:
atomizing and absorbing: the medicament solution is atomized by an atomizing nozzle arranged at the upper part in the first absorption tower 1; the flue gas is subjected to adsorption reaction by the atomized medicament in the first absorption tower to form gas containing water mist;
spray defogging: the reagent solution is sprayed by a spraying device arranged at the upper part of a plurality of packing layers in a second absorption tower, and the water-containing mist gas treated by the first absorption tower enters from the bottom of the second absorption tower and is subjected to adsorption reaction and water mist removal by the reagents in and above the plurality of packing layers to form benzene-containing gas;
deodorizing: the benzene-containing gas passing through the second absorption tower is subjected to adsorption reaction by adsorption packing in the deodorization device to form gas to be discharged;
deslagging: the second absorption tower conveys the medicament solution back to the medicament groove through a liquid outlet arranged at the bottom; the medicament groove is internally provided with a separation net, and the liquid outlet and the liquid inlet of the pump are positioned at two sides of the separation net to prevent waste residues from entering the liquid inlet of the pump; and the medicament solution in the medicament tank is circularly conveyed to the atomizing nozzle and the spraying device through a pump.
Through two absorption towers 1, 2 of establishing ties, combine 1 upper portion atomizer 12 of first absorption tower to form the medicament solution and spray, contact with the flue gas fully, on the one hand, the gaseous reaction in medicament spray contact and the flue gas reaches and gets rid of harmful gas, on the other hand medicament spray contacts and condenses with the dust and reaches further dust fall effect, second absorption tower 2 sets up different spray set 22 through multilayer packing layer 24, form rivers respectively, water smoke mainly plays and continues to remove dust, the reaction, rivers mainly play and remove water smoke and have the reaction concurrently, the dust fall effect, harmful gas and a small amount of dirt can be detached in further reaction, and can get rid of water smoke. The first two towers realize the absorption of dust and gas with high water solubility; after the flue gas is absorbed by the two wet absorption towers, the benzene series substances have short retention time in the two absorption towers and poor absorption effect due to low water solubility, and a deodorization device is arranged for further treatment. The adsorption filler filled in the deodorization device comprises activated carbon and a molecular sieve, a catalyst such as a normal-temperature catalyst is loaded in the adsorption filler, and gas enters gaps of the adsorption filler and is catalyzed by the catalyst in the gaps. By the process, the flue gas can be fully treated, the flue gas treatment rate reaches 90%, and benzene series is removed.
Referring to fig. 4, when the bottom of the second absorption tower is provided with the cyclone separator 4, the gas inlet 25 at the bottom of the second absorption tower is communicated with the gas inlet of the cyclone separator 4, the gas from the first absorption tower enters the cyclone separator 4 through the gas inlet 25, enters the second absorption tower 2 from the top opening of the cyclone separator 4 after cyclone separation, is treated by the multilayer packing layer 24, is discharged from the gas outlet 21, and can be emptied or introduced into the next treatment device.
The first absorption tower bottom opening 13 may serve as a gas inlet, and the upper opening 14 may serve as a gas outlet; conversely, the first absorption tower bottom opening 13 may serve as an air outlet and the upper opening 14 may serve as an air inlet. When the tower bottom 1 of the first absorption tower is provided with a cyclone separator, not shown in the figure, referring to fig. 4, the bottom opening 13 of the first absorption tower can be used as an air inlet, the bottom opening 13 is also communicated with the air inlet of the cyclone separator, the upper opening 14 can be used as an air outlet, the casting smoke enters the cyclone separator through the bottom opening 13, enters the first absorption tower 1 from the top opening of the cyclone separator after cyclone separation, and is discharged from the upper opening 14 and introduced into the second absorption tower 2 after the spraying action in the first absorption tower 1.
The first absorption tower 1 separates dust through the cyclone separator at the bottom of the tower and/or the second absorption tower separates dust through the cyclone separator at the bottom of the tower, and the gas forms spiral airflow, the gas flow speed is reduced, the retention time is increased for subsequent atomization and dust removal, most of the liquid medicament in the first/second absorption tower flows into the cyclone separator from the gas outlet of the cyclone separator, and flows to the bottom of the first/second absorption tower from the conical lower opening of the cyclone separator, and the liquid medicament in the cyclone separator can also play a certain dust-settling role.
Leading to pipe 11 has a plurality ofly along horizontal direction interval arrangement in the first absorption tower 1 atomizer 12, leading to pipe along vertical direction interval arrangement have a plurality ofly atomizer 12 through atomizer 12's setting for can be full of medicament water smoke in the first absorption tower, and form multistage absorption state along the entering direction of flue gas. Further preferably, the atomizer 12 is a high pressure atomizer, and atomizes the liquid medicament sufficiently to form a mist with smaller particles, so as to improve absorption and dust removal efficiency.
The second absorption tower 2 can form the medicament solution into different water flow/water mist states through different spraying devices 22 to achieve water absorption and mist elimination effects, specifically, referring to fig. 5-7, the spraying devices 22 can include a fire sprinkler 231 and water mist nozzles 232 and 233, the medicament solution forms umbrella-shaped water flow through the fire sprinkler 231, the water body of the umbrella-shaped water flow is large in thickness, reacts with gas and is more beneficial to removing water mist, a schematic diagram of the fire sprinkler head structure can refer to fig. 5, and of course, other fire sprinkler heads with proper structures can be selected according to needs; the water outlets of the fire-fighting spray header 231 form an umbrella-shaped water flow layer which covers the tower body completely, gas containing water mist enters the water flow layer, the water mist is absorbed by the water flow layer to realize a good de-misting effect, and the airflow resistance of the water flow layer is small; in a more preferred embodiment, a plurality of fire-fighting spray headers arranged in parallel can be combined to form a thicker water flow layer which completely covers the tower body, and the absorption and demisting effects of the thick water flow layer are better. If the follow-up odour removal device that still is provided with catalytic oxidation of second absorption tower, the catalytic effect of catalyst can receive the water smoke influence in it, perhaps needs to reach "white that disappears" that discharges the requirement, then need strengthen the interior water smoke effect of second absorption tower, preferably, can with the fire sprinkler head set up in the top of the superiors of second absorption tower packs, is closer to the gas outlet than other spray set to ensure the water smoke effect of gaseous last process in the second absorption tower.
The agent solution forms 0.01-0.15mm granular water mist or fog through the water mist nozzles 232 and 233, so that water mist drops in the smoke are adsorbed on one hand, and the agent solution reacts with the gas on the other hand. Alternatively, the water mist nozzles include, but are not limited to, a spiral nozzle 232, a solid cone nozzle 233. The chemicals at the spiral nozzle are mainly large-droplet water mist or water flow and large-droplet water mist, and are used for reacting with gas and adsorbing the water mist, and the water flow sprayed by the spiral nozzle generates static electricity to further demist, and the structural schematic diagram of the spiral nozzle is shown in fig. 6. The medicament solution is atomized at the solid cone nozzle, mainly used for reacting with gas, and the structural schematic diagram of the solid cone nozzle can be seen in fig. 7. The spiral nozzle and the solid cone nozzle are not limited in position in the tower, and certainly, in order to achieve the optimal demisting effect, the fire sprinkler head is arranged above the top layer mainly used for demisting, the spiral nozzle can be preferably arranged above the solid cone nozzle, so that preliminary demisting of the spiral nozzle can be connected with the demisting of the follow-up fire sprinkler head in a progressive mode, and the demisting effect is enhanced.
The types of the spraying devices 22 and the number of layers of the packing layer 24 can be set according to requirements, and when the packing layer 24 can be set into two layers for the lower standard flue gas treatment emission requirement, the spraying devices 22 can select two of the fire-fighting spray header 231, the spiral nozzles 232 and the solid cone nozzles 233 according to requirements; when the emission standard of flue gas treatment is higher, and the packing layer 24 is provided with three or more layers, the spraying device 22 can select at least two of the fire-fighting spray header 231, the spiral nozzle 232 and the solid cone nozzle 233 according to the requirement; if a better demisting effect is needed, the fire-fighting spray header can be selected to be combined with other spray devices for use, and the fire-fighting spray header is arranged above the uppermost layer of the filler.
The fire-fighting spray header 231 is generally used in the field of fire protection, the spiral nozzle 232 is generally used for large-scale dust removal in large-scale coal power plants, the solid cone nozzle 233 is generally used for spraying agricultural pesticides, and through the deep research on casting flue gas, the applicant combines and distributes spray devices in different fields for casting flue gas treatment, and designs and obtains an absorption tower more suitable for treating the casting flue gas. The fire sprinkler head 231, the spiral nozzle 232 and the solid cone nozzle 233 have specific structure, model, size and other parameters, which can be selected according to specific requirements, and are not specifically developed here.
For each packing layer 24, the packing can be selected from the existing packing such as annular packing, spherical packing, water curtain packing and the like, and is preferably the water curtain packing certainly, liquid flows from top to bottom along the fiber on the packing after dropping on the water curtain packing, so that a layer of water film is integrally formed, and simultaneously, the liquid is contacted with the entering gas, the gas and the liquid can be fully contacted, moreover, the gap width resistance of the water curtain is consistent, the wind resistance is small, the pressure drop of the gas passing through the water curtain is greatly reduced, and therefore, the requirement on the power of the fan is low, and the running cost is low.
A first liquid discharge port is formed at the bottom of the first absorption tower, the first absorption tower has less medicament solution, and the medicament solution in the first absorption tower can be conveyed to a second absorption tower or a medicament tank through the first liquid discharge port; and a second liquid outlet is formed in the bottom of the second absorption tower, and the medicine solution in the second absorption tower is conveyed to the medicine tank through the second liquid outlet.
The medicament tank 3 is provided with a separation net (not shown in the figure), the first liquid discharge port/the second liquid discharge port is separated from the liquid inlet of the pump by the separation net, salt generated by reaction in the first absorption tower and the second absorption tower and dust particles in smoke subsided to form solid waste residue, and the solid waste residue enters the medicament tank through the liquid discharge port, and the solid waste residue can be prevented from entering the liquid inlet of the pump by the arrangement of the separation net.
Furthermore, in order to reduce energy consumption, only one pump can be arranged to be connected with the first absorption tower and the atomization nozzles and the spraying devices corresponding to the second absorption tower, so that energy consumption is reduced, different pipe diameters or valve opening degrees of the pipelines are further selected through the pipelines, different water flow rates and different pressures of the pipelines can be realized to match the corresponding atomization nozzles and the corresponding spraying devices, and water flow or water mist can be conveniently and properly formed, for example, the pipe diameter of the pipeline of the fire-fighting spray header or the valve opening degree is larger than that of other pipelines.
In the above embodiment, as shown in fig. 1, the chemical tank 3 is provided as one, the chemical solution in the chemical tank is the same, and the chemical solution entering the first absorption tower and the second absorption tower from the chemical tank is the same. Of course, in other embodiments (not shown), the reagent tank is provided in a plurality of, for example, two reagent tanks, where the reagent solutions in the two reagent tanks are different, and the reagent solutions entering the first absorption tower and the second absorption tower from the reagent tanks are also different.
By the invention, three-stage treatment is formed, and different types of substances can be respectively treated at different stages. The first-stage spray tower can treat alcohols, alkenes and naphthenes; the secondary spray tower can treat ketone, phenol, lipid, anhydride and furan; the tertiary molecular sieve catalyst treats benzene series, aldehydes, methyl naphthalene, xanthene, nitrogen oxides and carbon oxides, and the primary and secondary treatments are incomplete and escape to tertiary gas. Or the first-stage spray tower can treat ketones, phenols, lipids, acid anhydrides and furans by interchanging medicament solutions; the secondary spray tower can treat alcohols, alkenes and naphthenes. The two absorption towers are provided with the same or different medicaments according to different high-temperature resin cracking components so as to realize effective absorption of cracked flue gas. The three-stage treatment of the invention forms a comprehensive scheme to ensure stable and economical operation in various concentrations of gases at high peaks and low valleys.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A process for deodorizing and deslagging casting flue gas is characterized by comprising the following steps:
atomizing and absorbing: the medicament solution is atomized by an atomizing nozzle arranged at the upper part in the first absorption tower; the flue gas is subjected to adsorption reaction by the atomized medicament in the first absorption tower to form gas containing water mist;
spray defogging: the reagent solution is sprayed by a spraying device arranged at the upper part of a plurality of packing layers in a second absorption tower, and the water-containing mist gas treated by the first absorption tower enters from the bottom of the second absorption tower and is subjected to adsorption reaction and water mist removal by the reagents in and above the plurality of packing layers to form benzene-containing gas;
deodorizing: the benzene-containing gas passing through the second absorption tower is subjected to adsorption reaction by adsorption packing in the deodorization device to form gas to be discharged;
deslagging: the second absorption tower conveys the medicament solution back to the medicament groove through a liquid outlet arranged at the bottom; the medicament groove is internally provided with a separation net, and the liquid outlet and the liquid inlet of the pump are positioned at two sides of the separation net to prevent waste residues from entering the liquid inlet of the pump; and the medicament solution in the medicament tank is circularly conveyed to the atomizing nozzle and the spraying device through a pump.
2. The process for deodorizing and deslagging casting fumes according to claim 1, wherein a cyclone is provided at the bottom of the first absorption tower and/or the bottom of the second absorption tower.
3. The process for deodorizing and deslagging casting fume according to claim 1, wherein the second absorption tower comprises a plurality of packing layers arranged at intervals, and each packing layer is correspondingly provided with different spray header devices.
4. The process of claim 3, wherein the spray header assembly comprises a fire spray header through which the water is formed into an umbrella-shaped water flow layer, and a water mist nozzle through which the water is formed into a granular water mist or mist of 0.01-0.15 mm.
5. The process of claim 4, wherein the second absorption tower is provided with an air outlet at the upper part and an air inlet at the lower part, and the fire sprinkler is arranged above the uppermost packing of the second absorption tower.
6. The process for deodorizing and deslagging casting fumes according to claim 4 or 5, wherein said water mist nozzles comprise spiral nozzles, solid cone nozzles; preferably, the spiral nozzle is disposed above the solid cone nozzle.
7. The process for deodorizing and deslagging casting fumes according to claim 1, wherein the filler layer is selected from annular fillers, spherical fillers and water curtain fillers, preferably water curtain fillers.
8. The process for deodorizing and deslagging casting fume according to claim 1, wherein a plurality of said atomizing nozzles are arranged in said first absorption tower at intervals along a horizontal direction, and a plurality of said atomizing nozzles are arranged at intervals along a vertical direction, and said atomizing nozzles are high-pressure nozzles.
9. The process for deodorizing and deslagging casting smoke according to claim 1, wherein the number of the reagent tanks is one or more, the reagent solutions in the reagent tanks are the same or different, and the reagent solutions entering the first absorption tower and the second absorption tower from the reagent tanks are the same or different; a first liquid discharge port is formed in the bottom of the first absorption tower, and the medicine solution in the first absorption tower is conveyed to a second absorption tower or a medicine tank through the first liquid discharge port; and a second liquid outlet is formed in the bottom of the second absorption tower, and the medicine solution in the second absorption tower is conveyed to the medicine tank through the second liquid outlet.
10. The process for deodorizing and deslagging casting flue gas according to claim 1, wherein the adsorption filler filled in the deodorizing device comprises activated carbon and a molecular sieve, and a normal-temperature catalyst is loaded in the adsorption filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110542034.3A CN113332843A (en) | 2021-05-18 | 2021-05-18 | Process for deodorizing and deslagging casting flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110542034.3A CN113332843A (en) | 2021-05-18 | 2021-05-18 | Process for deodorizing and deslagging casting flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113332843A true CN113332843A (en) | 2021-09-03 |
Family
ID=77469190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110542034.3A Pending CN113332843A (en) | 2021-05-18 | 2021-05-18 | Process for deodorizing and deslagging casting flue gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113332843A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202237761U (en) * | 2011-09-15 | 2012-05-30 | 常州天兴环保科技有限公司 | Multi-medium absorbing and deodorizing waste gas treating equipment |
| CN103272463A (en) * | 2013-05-23 | 2013-09-04 | 杭州国泰环保科技有限公司 | Process for treating malodorous gases in sludge |
| CN203990287U (en) * | 2014-07-29 | 2014-12-10 | 杭州绿然环保设备有限公司 | A kind of spray column |
| CN204710096U (en) * | 2015-05-04 | 2015-10-21 | 中起重工（大连）有限公司 | A kind of spray type desulfurization absorption tower |
| US20160361685A1 (en) * | 2014-07-06 | 2016-12-15 | Millenium Synthfuels Corporation | Exhaust gas clean-up system for fossil fuel fired power plant |
| CN107308797A (en) * | 2017-08-29 | 2017-11-03 | 哈尔滨蔚蓝环保设备制造有限公司 | A kind of flue gas circulating fluidized bed desulfurization and wet type desulfurizing combination minimum discharge technique |
| CN108479369A (en) * | 2018-04-24 | 2018-09-04 | 中国石油化工股份有限公司 | A kind of ultra-clean discharge ammonia desulfuration equipment and technique |
| CN110368798A (en) * | 2019-08-12 | 2019-10-25 | 郑州金泉矿冶设备有限公司 | For handling the complete set of equipments of high concentration nitrogen oxide |
| CN210786806U (en) * | 2019-08-21 | 2020-06-19 | 太仓华庆汽车配件有限公司 | Coating waste gas treatment equipment |
| CN212091628U (en) * | 2020-04-14 | 2020-12-08 | 江苏和顺环保有限公司 | Processing system of tail gas that produces in laboratory waste liquid is placed or is dealt with process |
| CN112316643A (en) * | 2020-11-03 | 2021-02-05 | 宁波大千纺织品有限公司 | Waste gas treatment device of setting machine |
-
2021
- 2021-05-18 CN CN202110542034.3A patent/CN113332843A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202237761U (en) * | 2011-09-15 | 2012-05-30 | 常州天兴环保科技有限公司 | Multi-medium absorbing and deodorizing waste gas treating equipment |
| CN103272463A (en) * | 2013-05-23 | 2013-09-04 | 杭州国泰环保科技有限公司 | Process for treating malodorous gases in sludge |
| US20160361685A1 (en) * | 2014-07-06 | 2016-12-15 | Millenium Synthfuels Corporation | Exhaust gas clean-up system for fossil fuel fired power plant |
| CN203990287U (en) * | 2014-07-29 | 2014-12-10 | 杭州绿然环保设备有限公司 | A kind of spray column |
| CN204710096U (en) * | 2015-05-04 | 2015-10-21 | 中起重工（大连）有限公司 | A kind of spray type desulfurization absorption tower |
| CN107308797A (en) * | 2017-08-29 | 2017-11-03 | 哈尔滨蔚蓝环保设备制造有限公司 | A kind of flue gas circulating fluidized bed desulfurization and wet type desulfurizing combination minimum discharge technique |
| CN108479369A (en) * | 2018-04-24 | 2018-09-04 | 中国石油化工股份有限公司 | A kind of ultra-clean discharge ammonia desulfuration equipment and technique |
| CN110368798A (en) * | 2019-08-12 | 2019-10-25 | 郑州金泉矿冶设备有限公司 | For handling the complete set of equipments of high concentration nitrogen oxide |
| CN210786806U (en) * | 2019-08-21 | 2020-06-19 | 太仓华庆汽车配件有限公司 | Coating waste gas treatment equipment |
| CN212091628U (en) * | 2020-04-14 | 2020-12-08 | 江苏和顺环保有限公司 | Processing system of tail gas that produces in laboratory waste liquid is placed or is dealt with process |
| CN112316643A (en) * | 2020-11-03 | 2021-02-05 | 宁波大千纺织品有限公司 | Waste gas treatment device of setting machine |
Non-Patent Citations (2)
| Title |
|---|
| 代端明: "《北京市<大气污染物综合排放标准>实施技术指南》", 中国矿业大学出版社 * |
| 宋晓辉等: "《铝合金粉材生产技术》", 31 August 2008, 冶金工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102895871B (en) | A kind of waste gas purification apparatus | |
| CN208436600U (en) | A kind of bituminous mixing plant exhaust treatment system | |
| CN202876643U (en) | Waste gas purifying treatment device | |
| CN104624006B (en) | A kind of multistage filtering formula waste gas purification apparatus | |
| CN104226107A (en) | Composite bed treatment method and equipment of waste gas | |
| WO2017219623A1 (en) | Online cyclic regeneration organic waste gas treatment method and device | |
| CN104606996B (en) | Adsorption filtration and atomizing purification device suitable for industrial exhaust gas treatment | |
| CN105107348B (en) | It is a kind of to react complete set of equipments for handling the strong oxygen catalysis of the multiphase of VOC organic exhaust gas | |
| CN109432944A (en) | Spray the purification concentration cycles method and system of exhaust gas | |
| CN112221286A (en) | Deep absorption tower for flue gas treatment, flue gas treatment system and process | |
| CN205965456U (en) | Organic waste gas integrated treating equipment | |
| CN101745297B (en) | Exhaust gas processing device of garbage incineration furnace | |
| CN207871896U (en) | A kind of intermediate pollution equipment for treating industrial waste gas | |
| CN105498495A (en) | Device for treating waste gas by Fenton oxidation | |
| CN205730822U (en) | A kind of organic exhaust gas centralized processor | |
| CN214051026U (en) | Casting flue gas treatment facility | |
| CN113332843A (en) | Process for deodorizing and deslagging casting flue gas | |
| CN202725010U (en) | Device for removing trace acidic gas in indoor air | |
| CN212283463U (en) | Oil chemical refining tail gas purification device | |
| CN205261689U (en) | Striking STREAMING fume purification device | |
| CN210544375U (en) | VOC gas purification and reuse device | |
| CN204469523U (en) | A kind of industrial foul waste gas purifier | |
| CN208678695U (en) | A kind of spraying lacquer spraying waste gas processing system | |
| CN208229612U (en) | A kind of organic exhaust gas type absorption purification tower | |
| CN208512147U (en) | Exhaust treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210903 |