CN211800029U

CN211800029U - Bridge beam supports paint spraying line exhaust gas purification device

Info

Publication number: CN211800029U
Application number: CN201921676127.XU
Authority: CN
Inventors: 李云飞; 周永毅
Original assignee: Guangzhou Zike Environmental Protection Technology Co ltd
Current assignee: Zike Equipment Co ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-10-30
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a bridge beam supports line exhaust gas purification device that sprays paint, include according to inhaling of waste gas flow direction intercommunication in proper order and strain formula oil filter, first washing unit that sprays, second spray washing unit, dehydration defogging mechanism, compound photocatalysis mechanism, peculiar smell controller and centrifugal fan, first washing unit that sprays is used for spraying sodium hydroxide solution, the second spray washing unit is used for spraying deodorant liquid, dehydration defogging mechanism is used for dry waste gas, compound photocatalysis mechanism is arranged in detaching the volatile organic compound in the waste gas, the peculiar smell controller is used for detaching the little volatile molecule of molecular weight, still include with the chimney that centrifugal fan connects, centrifugal fan is suitable for extraction gas and discharges extraction gas from the chimney, and this bridge beam supports paint spraying line exhaust gas purification device can effectively detach the xylol that exists in the waste gas, Non-methane total alkane, stink and other pollutants, and has good waste gas treatment effect.

Description

Bridge beam supports paint spraying line exhaust gas purification device

Technical Field

The invention relates to the technical field of waste gas treatment, in particular to a waste gas purification device for a bridge support paint spraying line.

Background

When the bridge support is painted, a large amount of waste gas is generated, and the waste gas contains a large amount of paint mist, benzene, toluene, xylene, non-methane total alkane, stink and other pollutants. The generated waste gas has high temperature, large pollution, large discharge amount and complex and variable pollution components, particularly, the foul components in the waste gas easily cause great pollution to the surrounding environment and the plant area environment, and the phenomenon of disturbing residents is difficult to avoid. Aiming at the problem that a large amount of waste gas is generated during the paint spraying work of the bridge bearing, the treatment is carried out by adopting a dry neutralization method, a composite photocatalysis method, an ion deodorization method, an absorption method, an adsorption method, a microbial degradation method, a composite active oxygen method, a micronutrient decomposition method, a combustion method, a condensation method and the like at present, but the pollutants such as dimethylbenzene, non-methane total alkane, stink and the like in the waste gas cannot be well removed by adopting the above method, and the waste gas treatment effect is poor.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the waste gas purification device for the bridge support paint spraying line, which can effectively remove the pollutants such as dimethylbenzene, non-methane total alkane, stink and the like in the waste gas and has a good waste gas treatment effect.

The purpose of the invention is realized by adopting the following technical scheme:

the waste gas purification device comprises a suction filter type oil filter, a first spraying and washing device, a second spraying and washing device, a dehydration and demisting mechanism, a composite photocatalysis mechanism, an odor controller and a centrifugal fan which are sequentially communicated according to the flow direction of waste gas, wherein the first spraying and washing device is used for spraying a sodium hydroxide solution, the second spraying and washing device is used for spraying a deodorizing liquid, the dehydration and demisting mechanism is used for drying the waste gas, the composite photocatalysis mechanism is used for removing volatile organic compounds in the waste gas, the odor controller is used for removing volatile molecules with small molecular weight, the device further comprises a chimney connected with the centrifugal fan, and the centrifugal fan is suitable for extracting gas and discharging the extracted gas from the chimney.

Further, the first spray washing device comprises a first flow washing tank, a first packing layer, a first spray head, a first water pump and a first water tank, wherein the first packing layer is arranged in the first flow washing tank, the first spray head is arranged above the first packing layer, and the first flow washing tank, the first water pump and the first spray head are sequentially communicated; the first washing tank is communicated with the second spraying and washing device.

Furthermore, the second spray washing device comprises a second washing tank, a second packing layer, a second spray head, a second water pump and a second water tank, wherein the second packing layer is arranged in the second washing tank, the second spray head is arranged above the second packing layer, and the second washing tank, the second water pump and the second spray head are sequentially communicated; the first flow washing tank, the second flow washing tank and the dewatering and demisting mechanism are communicated in sequence according to the exhaust emission flow direction.

Further, the dehydration defogging mechanism is a dehydration defogger.

Further, the composite photocatalytic mechanism comprises an ultraviolet lamp, and the wavelength of the ultraviolet lamp can be 185nm, 254nm or 365 nm.

Further, the height of the chimney is equal to or greater than 15 m.

Further, the centrifugal fan is a medium-low pressure centrifugal fan.

Compared with the prior art, the invention has the beneficial effects that:

this application is through the suction filter formula oil filter that sets up, first washing device that sprays, second spray washing device, dehydration defogging mechanism, compound photocatalysis mechanism and peculiar smell controller to through multiple processing mode, effectively detach pollutants such as coating cloud, benzene, toluene, xylol, non-first total alkane and stench in the waste gas, compare current exhaust purification device and adopt single mode to handle waste gas, its exhaust-gas treatment is effectual, effectively avoids remaining harmful substance in the exhaust gas.

Drawings

FIG. 1 is a schematic structural diagram of an exhaust gas purification device of a bridge bearing painting line according to the present invention;

FIG. 2 is a flow chart of an exhaust gas purification device of a bridge bearing spray painting line according to the present invention;

FIG. 3 is a schematic structural view of a first spray washing device of the waste gas purification device of the bridge bearing spray painting line of the present invention;

fig. 4 is a schematic structural diagram of a second spray washing device of the waste gas purification device of the bridge bearing spray painting line of the invention.

The figure is as follows: 1. a suction filter type oil filter; 2. a first spray washing device; 21. a first flow-washing tank; 22. a first filler layer; 23. a first shower head; 24. a first water pump; 25. a first water tank; 3. a second spray washing device; 31. a second flow washing tank; 32. a second packing layer; 33. a second shower head; 34. a second water pump; 35. A second water tank; 4. a dewatering and demisting mechanism; 5. a composite photocatalytic mechanism; 6. a odor controller; 7. a centrifugal fan; 8. and (4) a chimney.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

As shown in fig. 1-4, the waste gas purification device for the bridge support spray painting line comprises a suction filter type oil filter 1, a first spray washing device 2, a second spray washing device 3, a dehydration demisting mechanism 4, a composite photocatalysis mechanism 5, an odor controller 6 and a centrifugal fan 7 which are sequentially communicated according to the flow direction of waste gas, wherein the first spray washing device 2 is used for spraying a sodium hydroxide solution, the second spray washing device 3 is used for spraying a deodorizing liquid, the dehydration demisting mechanism 4 is used for drying the waste gas, the composite photocatalysis mechanism 5 is used for removing volatile organic compounds in the waste gas, the odor controller 6 is used for removing molecules with small molecular weight and volatility, the waste gas purification device further comprises a chimney 8 connected with the centrifugal fan 7, and the centrifugal fan 7 is suitable for extracting gas and discharging the extracted gas from the chimney 8. Dehydration defogging mechanism 4 is the dehydration defroster in this application, and peculiar smell controller 6 is VP gas distribution equipment.

In operation, the exhaust gas is sent to the suction filter 1 for primary treatment under the action of the centrifugal fan 7. When waste gas containing paint mist aerosol particles passes through, the waste gas collides with the surface of a perforated box and a filter element sheet of an oil filtering module in a suction filtering type oil filter 1, large paint mist particles are adhered to the surface of the perforated box and the surface of the filter element sheet to realize oil-gas separation, dust and paint mist in the waste gas are further removed, then the waste gas is conveyed into a first spraying and washing device 2, the first spraying and washing device 2 sprays sodium hydroxide on the entering waste gas, the sodium hydroxide is in gas-liquid contact with odor molecules in the gas, so that the odor components in the gas phase are transferred to a liquid phase, and odor substances such as hydrogen sulfide, methyl mercaptan, methyl sulfide, methyl disulfide, lower fatty acid and the like in the waste gas are removed through neutralization, oxidation or other chemical reactions of chemical agents and the odor components; the exhaust gas treated by the first spray washing device 2 is sent to the second spray washing device 3. The second spraying and washing device 3 sprays a certain amount of NewBio-C plant extracting solution (namely deodorizing solution) to the entering waste gas, and odor gas in the waste gas is fully contacted with the NewBio-C plant extracting solution so as to be absorbed and removed by the NewBio-C plant extracting solution, and meanwhile, the odor concentration can be effectively reduced; the waste gas becomes the gas-liquid mixing state after being treated by the first spraying and washing device 2 and the second spraying device, and in order to avoid influencing the next treatment, the waste gas needs to be treated by the dehydration and demisting mechanism 4 so as to remove most of water vapor in the waste gas. In the treatment process, due to the inertia effect of the rising of the waste gas, the water vapor collides with the dehydration layer and is attached to the surface, so that the liquid drops are larger and larger, the gravity sedimentation is achieved, and the water vapor in the waste gas is removed; the waste gas treated by the dehydration demisting mechanism 4 is conveyed into a composite photocatalysis mechanism 5, and is subjected to photocatalytic oxidation under the irradiation of a lamp of a high-energy ultraviolet lamp beam in the composite photocatalysis mechanism 5 so as to rapidly and effectively decompose organic matters and remove easily decomposed and oxidized waste gas components such as benzene, toluene, xylene, non-methane total hydrocarbons, VOCs and the like in a part of waste gas; the exhaust gas is then conveyed to the odour control 6 for deodorising, after which it can be discharged through a chimney 8. At the moment, the components contained in the waste gas and polluting the environment are greatly reduced, and the emission concentration of the polluted gas is far lower than the environmental protection emission standard.

The core of suction filtration type oil filter 1 in this application is suction filtration chip, it is one kind and has special filtration adsorption material, SUS304 of high temperature resistant corrosion resistant is used to the shell, inside filter core chip adopts the alloy silk filter media, filter chip inside is the clearance extremely thin and be the special unit of labyrinth honeycomb formula design, be three-dimensional network structure, porosity is higher (greater than 95%), tensile strength is good and the moderate characteristics of aperture, thereby reduce the flow resistance, the deposit volume of having increaseed oil, the effectual contradiction of purifying and ventilating of having solved. When waste gas of oily aerosol particles passes through, the waste gas collides with the purification filter element sheet, large oily particles are adhered to the surface of the filter element sheet, most oily particles are adsorbed on the filter element sheet when the waste gas passes through the filter element, and residual oily molecules of fine particles are rapidly collided for many times due to rapid time change of filtering speed when passing through the inside of the labyrinth and superfine gap chip, and the oily molecules of the fine particles are adhered to the wall of the chip and are settled under the action of gravity in the advancing process of air flow to be purified.

The first spraying and washing device 2 adopts an alkali liquor absorption method to remove substances such as NH3, H2S and thiols and hard-to-decompose fatty acid in waste gas, and the specific principle is as follows, the spraying liquid in the first spraying and washing device 2 is NaOH solution, the NaOH solution has a good removing effect on hydrogen sulfide and ammonia gas, and the hydrogen sulfide and the ammonia gas can be dissolved in water and can react. The hydrosulfuric acid is weak acid, and is ionized in water in a grading way, and the hydrosulfuric acid is an aqueous solution of hydrogen sulfide gas, is a mixture and is volatile binary weak acid; ammonia is very soluble in aqueous solutions. The relevant reaction formula is as follows:

H2S+H2O＝HS-+H3O+

HS-+H2O＝S2-+H3O+

NH3+H2O＝NH3·H2O

the NaOH solution has a good treatment effect on hydrogen sulfide, and the reaction formula is as follows:

H2S +2NaOH Na2S + H2O (H2S in sufficient quantity)

H2S + NaOH + NaHS + H2O (H2S excess)

Therefore, NH3, H2S, and thiol substances and hard-to-decompose fatty acids in the exhaust gas treated by the first spray scrubber 2 are effectively removed.

Then the waste gas is conveyed to the second spraying and washing device 3, when the device works, the second spraying head 33 sprays NEWBIO-C deodorizing liquid, and as the NEWBIO-C deodorizing liquid contains deodorizing particles, the surfaces of the deodorizing particles can not only effectively adsorb odor molecules in the air, but also promote the change of the spatial configuration of the adsorbed odor molecules. The deodorizing particles can provide electrons for odor molecules to accelerate the reaction with the odor molecules; the surface energy can adsorb odor molecules in the air, and the three-dimensional structure in the odor molecules is changed and becomes unstable; meanwhile, odor molecules adsorbed on the surfaces of the deodorizing particles can also react with oxygen in the air. The detailed process is as follows:

acid-base reaction, for example, the deodorized particles contain trace alkaloid which can react with acidic odor molecules such as hydrogen sulfide. Unlike typical acid-base reactions, typical bases are toxic, inedible, and not biodegradable. The high-purity plant extract can be biodegraded and is nontoxic.

Catalytic oxidation reactions, such as hydrogen sulfide and other acidic gases, typically do not react with oxygen in the air. But can react with oxygen in the air under the catalysis of the plant extract. Taking the reaction of hydrogen sulfide as an example:

R-NH2+H2S→R-NH3++SH-

R-NH2+SH-+O2+H2O→R-NH3+SO42-+OH-

R-NH3++OH-→R-NH2+H2O

redox reactions, such as formaldehyde, are oxidative and available molecules in the vegetation liquor are reductive. They can be reacted directly. Reaction with formaldehyde and ammonia:

HR-NH2+HCHO→R-HN2+H-C＝CO2+H2O

R-NH2+NH3→R-NH2+N2+H2O

therefore, the malodorous substances such as hydrogen sulfide in the exhaust gas treated by the second spray washing device 3 can be effectively removed. However, after the NEWBIO-C deodorizing liquid reacts with the malodorous substance, a large amount of mist (i.e. water) is carried in the exhaust gas, so as to avoid the mist from affecting the subsequent purification of the exhaust gas.

Therefore, the waste gas after being treated by the second spray washing device 3 needs to enter the dehydration and demisting mechanism 4 to remove the mist therein. Specifically, after the exhaust gas enters the dewatering and demisting mechanism 4, the exhaust gas with the mist will rise at a certain speed and pass through the spray washing layer in the dewatering and demisting mechanism 4, and due to the inertia effect of the rising mist, the mist collides with the chemical washing layer and is attached to the surface of the chemical washing layer. The dispersion of the mist on the surface of the chemical cleaning layer and the gravity sedimentation of the mist enable the mist to form larger liquid drops which flow to the junction of the two filaments along the chemical cleaning layer. The wettability of the chemical washing layer, the surface tension of the liquid and the capillary action of the chemical washing layer enable the liquid drops to be larger and larger, and the liquid drops are separated from the chemical washing layer and fall down until the gathered liquid drops are large enough that the gravity generated by the liquid drops exceeds the resultant force of the rising force of the gas and the surface tension of the liquid. The gas is substantially free of entrainment after passing through the chemical scrubbing unit.

The mist in the gas is separated to improve the operation condition, optimize the process index, reduce the corrosion of the equipment, prolong the service life of the equipment, increase the treatment capacity, recover valuable materials, protect the environment, reduce the atmospheric pollution and the like. The structure is simple, the volume is small, the efficiency of dust removal and dehydration is high, the resistance is small, the weight is light, the installation, the operation and the maintenance are convenient, and the collection efficiency of the chemical washing device reaches 98 to 99.8 percent for the mist with the particle size of more than or equal to 3 to 5 um.

The waste gas after treatment enters the composite photocatalysis mechanism 5, and the composite photocatalysis mechanism 5 is divided into a high-efficiency pretreatment section and a composite photocatalysis section which are usually integrated, so that the occupied area and the installation workload can be effectively reduced. The high-efficiency pretreatment section is mainly formed by combining modularized professional composite fibers and mainly used for treating each component of waste gas so as to adsorb and remove harmful chemical gas in the waste gas, reduce the pressure of rear-end treatment and improve the waste gas treatment efficiency. In addition, besides the existing conventional composite photocatalytic mechanism 5, an integrated composite photocatalytic deodorization device with the patent application number of CN201120149173.1 can be selected; or, an integrated composite photocatalytic deodorization device with the patent application number of CN201720428147.X can also be selected.

Ultraviolet lamp with specific wavelength (the wavelength of the ultraviolet lamp can be 185nm, 254nm or 365 nm.) is used as light energy donor for photocatalytic oxidation, and the photocatalyst nanoparticles can be excited to generate electron-hole pairs under the irradiation of ultraviolet light with certain wavelength to decompose the catalyst. The photocatalytic oxidation of TiO2 is a result of the interaction of active hydroxyl groups (. OH) with other active oxidizing species (. O2-,. OOH, H2O 2). OH groups generated on the surface of TiO2 have high reactivity and higher reaction energy than various chemical bond energies in organic matters, and can quickly and effectively decompose the organic matters by the synergistic effect of O2-,. OOH and H2O2 active oxidation substances.

The rough reaction mechanism is:

H2S+O2、O2-、O2+→SO3+H2O

NH3+O2、O2-、O2+→NOx+H2O

VOCs+O2、O2-、O2+→SO3+CO2+H2O

obviously, the main function of the composite photocatalytic mechanism 5 is to further remove some organic matters such as benzene, toluene, xylene, non-methane total hydrocarbons, VOCs, etc. in the exhaust gas.

Wherein, peculiar smell controller 6 can select for use current conventional peculiar smell controller, and in order to improve the purifying effect, in this embodiment, peculiar smell controller 6 selects for use Vaportek peculiar smell controller (being VP gas distribution equipment), and Vaportek deodorization diaphragm is the main deodorization unit. Odor removing particles are uniformly distributed on the surface of the membrane through VP, and the odor is rapidly removed by utilizing the air convection power, and meanwhile, other external substances cannot be sucked, so that the naturalness of the plant extracting solution is kept forever. The deodorizing particles in the waste gas can quickly and actively capture the odor gas molecules in the air and wrap the odor particles. The common odor molecules are mostly small molecular organic matters (esters, alcohols, aromatic hydrocarbons and the like), and also comprise part of inorganic small molecules such as ozone, ammonia, hydrogen sulfide, hydrocarbons and the like, and the odor molecules have high activity on the surface of olfactory cells and strong irritation, and still have strong olfactory pollution capacity even under the premise that the concentration of each odor component reaches the standard and is discharged, namely the odor molecules have the characteristics of low pollution concentration and high odor intensity. Vaportek particles are natural oily deodorized molecules, and the particles are in non-covalent combination with odor molecules through intermolecular nonpolar interaction, so that the molecules are greatly stabilized, and the activity and the irritation of the molecules are reduced. Further, the increase in specific gravity after the binding is solved by the sedimentation effect. The process is different from chemical reaction process to generate a third substance and masking effect, does not cause secondary pollution, and can thoroughly remove odor.

The first spraying and washing device 2 comprises a first washing tank 21, a first packing layer 22, a first spraying head 23, a first water pump 24 and a first water tank 25, wherein the first packing layer 22 is arranged in the first washing tank 21, the first spraying head 23 is arranged above the first packing layer 22, and the first washing tank 21, the first water tank 25, the first water pump 24 and the first spraying head 23 are sequentially communicated; the first rinsing bath 21 communicates with the second spray rinsing device. It will be appreciated that the sodium hydroxide solution in the first water tank 25 may be pumped by the first water pump 24 to the first spray header 23 for cyclic spraying. Obviously, the first packing layer 22 is also used to ensure that the gas and the liquid are fully contacted and fully reacted; thus, first packing layer 22 is a gas-liquid mass transfer medium as a conventional option. When the waste gas is introduced into the first washing tank 21 from the first washing tank 21, preferably into the first packing layer 22, when the waste gas gradually rises from the first packing layer 22, the waste gas can basically fully contact and react with the spray liquid of the first spray header 23, and then the waste gas is introduced into the dewatering and demisting mechanism 4 from the upper part of the first washing tank 21. Similarly, the setting mode is only one of the setting modes of the first spraying washing device; according to the working principle of the first spraying and washing device, the existing conventional spraying equipment can be adopted to spray the waste gas; of course, compared with the conventional spraying equipment, the first spraying and washing device has the functions of fully contacting and fully reacting with the waste gas.

The second spray washing device 3 comprises a second washing tank 31, a second packing layer 32, a second spray head 33, a second water pump 34 and a second water tank 35, wherein the second packing layer 32 is arranged in the second washing tank 31, the second spray head 33 is arranged above the second packing layer 32, and the second washing tank 31, the second water tank 35, the second water pump 34 and the second spray head 33 are sequentially communicated; the first flow washing tank 21, the second flow washing tank 31 and the dehydration demisting mechanism 4 are communicated in sequence according to the exhaust emission flow direction.

It is understood that the deodorizing liquid in the second water tank 35 may be pumped to the second shower head 33 by the second water pump 34 to be cyclically sprayed. Obviously, the second packing layer 32 is also used to ensure that the gas and the liquid are fully contacted and fully reacted; thus, second packing layer 32 is a gas-liquid mass transfer medium as a conventional option. When the waste gas is introduced into the second washing tank 31 from the first washing tank 21, preferably into the second packing layer 32, when the waste gas gradually rises from the second packing layer 32, the waste gas can basically fully contact and react with the spray liquid of the second spray header 33, and then the waste gas is introduced into the dehydration and demisting mechanism 4 from the upper part of the second washing tank 31. Similarly, the setting mode is only one of the setting modes of the second spraying washing device; according to the working principle of the second spraying and washing device, the existing conventional spraying equipment can be adopted to spray the waste gas; of course, compared with the conventional spraying equipment, the second spraying and washing device has the functions of fully contacting and fully reacting with the waste gas.

Specifically, the height of the chimney 8 is equal to or greater than 15m to discharge the exhaust gas from a high place.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a bridge beam supports line exhaust gas purification device that sprays paint which characterized in that: the device comprises a suction filter type oil filter, a first spraying and washing device, a second spraying and washing device, a dehydration and demisting mechanism, a composite photocatalysis mechanism, an odor controller and a centrifugal fan which are sequentially communicated according to the flow direction of waste gas, wherein the first spraying and washing device is used for spraying a sodium hydroxide solution, the second spraying and washing device is used for spraying a deodorizing liquid, the dehydration and demisting mechanism is used for drying the waste gas, the composite photocatalysis mechanism is used for removing volatile organic compounds in the waste gas, the odor controller is used for removing volatile molecules with small molecular weight, and the device further comprises a chimney connected with the centrifugal fan, and the centrifugal fan is suitable for extracting gas and discharging the extracted gas from the chimney.

2. The exhaust gas purification device for the bridge bearing painting line according to claim 1, wherein: the first spray washing device comprises a first flow washing tank, a first packing layer, a first spray head, a first water pump and a first water tank, wherein the first packing layer is arranged in the first flow washing tank, the first spray head is arranged above the first packing layer, and the first flow washing tank, the first water pump and the first spray head are sequentially communicated; the first washing tank is communicated with the second spraying and washing device.

3. The exhaust gas purification device for the bridge bearing painting line according to claim 2, wherein: the second spray washing device comprises a second washing pool, a second packing layer, a second spray head, a second water pump and a second water tank, wherein the second packing layer is arranged in the second washing pool, the second spray head is arranged above the second packing layer, and the second washing pool, the second water tank, the second water pump and the second spray head are sequentially communicated; the first flow washing tank, the second flow washing tank and the dewatering and demisting mechanism are communicated in sequence according to the exhaust emission flow direction.

4. The exhaust gas purification device for the bridge bearing painting line according to claim 1, wherein: the dehydration demisting mechanism is a dehydration demister.

5. The exhaust gas purification device for the bridge bearing painting line according to claim 1, wherein: the composite photocatalytic mechanism comprises an ultraviolet lamp, and the wavelength of the ultraviolet lamp can be 185nm, 254nm or 365 nm.

6. The exhaust gas purification device for the bridge bearing painting line according to claim 1, wherein: the height of the chimney is equal to or greater than 15 m.

7. The exhaust gas purification device for the bridge bearing painting line according to claim 1, wherein: the centrifugal fan is a medium-low pressure centrifugal fan.