CN110604989A

CN110604989A - Modified plastic extruder flue gas purification device and method

Info

Publication number: CN110604989A
Application number: CN201910866698.8A
Authority: CN
Inventors: 李云飞; 周永毅
Original assignee: Guangzhou Purple Cape Environmental Protection Technology Co Ltd
Current assignee: Guangzhou Purple Cape Environmental Protection Technology Co Ltd
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2019-12-24

Abstract

The invention discloses a modified plastic extruder flue gas purification device which comprises a plurality of connecting pipes, a closed collection device, a chain type dust remover, a composite photocatalysis device, a spraying and washing device, a gas distribution device and an odor controller, wherein the closed collection device, the chain type dust remover, the composite photocatalysis device, the spraying and washing device, the gas distribution device and the odor controller are sequentially communicated through the connecting pipes, waste gas is controlled in a fixed area by the closed collection device and enters the chain type dust remover through the connecting pipes, the waste gas is filtered by the chain type dust remover to remove grease and dust, then enters the composite photocatalysis device to decompose organic matters, then enters the spraying and washing device to be washed for preliminary deodorization, and the waste gas after preliminary deodorization enters the gas distribution device and the odor controller to be thoroughly deodorized. The modified plastic extruder flue gas purification device has a good exhaust gas purification effect on large air quantity medium and high concentration waste gas, and the exhaust gas monitoring concentration is far lower than the environmental protection emission standard. The invention also relates to a modified plastic extruder flue gas purification method.

Description

Modified plastic extruder flue gas purification device and method

Technical Field

The invention relates to waste gas purification, in particular to a modified plastic extruder flue gas purification device.

Background

The modified plastic extruder is generally a twin-screw extruder and a granulator, and the waste gas contains smoke, dust, VOC (volatile organic compounds) (hydrocarbons such as benzene, toluene, ethylbenzene and the like) and stink. The pollution intensity of the waste gas is large, the emission is large, the pollution components are complex and changeable, 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.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the modified plastic extruder flue gas purification device which can aim at the characteristics of waste gas diversity, variability, high pollution concentration, large treatment capacity and the like.

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

the utility model provides a modified plastics extruder gas cleaning device, includes a plurality of connecting pipes, airtight collection device, chain formula dust remover, compound photo-catalytic device, sprays washing device, gas distribution device and peculiar smell controller, airtight collection device, chain formula dust remover, compound photo-catalytic device, spray washing device, gas distribution device and peculiar smell controller pass through the connecting pipe communicates in proper order, airtight collection device with waste gas control at fixed region and pass through the connecting pipe gets into chain formula dust remover, waste gas warp get into after chain formula dust remover filters and gets into compound photo-catalytic device decomposes the organic matter, gets into again and sprays washing device washing preliminary deodorization, and waste gas after preliminary deodorization gets into again gas distribution device reaches the peculiar smell controller thoroughly deodorizes.

Furthermore, the closed collecting device comprises a gas collecting hood and a collecting air pipe, the collecting air pipe is communicated with the gas collecting hood, and the gas collecting hood is communicated with the chain type dust remover.

Furthermore, a chain of the chain type dust collector is additionally provided with glass fiber filter cloth and high-efficiency air filter cotton, and when the waste gas passes through a filter layer formed by the glass fiber filter cloth and the high-efficiency air filter cotton, particulate matters, dust and grease in the gas are intercepted.

Further, the chain type dust remover further comprises two differential pressure meters, an alarm and a scraper, wherein the two differential pressure meters are arranged at the front section and the rear section of the filter layer, when the differential pressure of the two differential pressure meters exceeds a set range, the alarm gives an alarm, and meanwhile, the scraper is started and scrapes the intercepted objects on the filter layer back and forth so as to restore normal work.

Further, the composite photocatalytic structure comprises a pretreatment section, the pretreatment section comprises a plurality of modularized composite fibers, and the composite fibers adsorb harmful chemical gases in waste gases.

Further, the composite photocatalytic structure comprises a composite photocatalytic section, the composite photocatalytic section comprises a high-energy ultraviolet lamp, and waste gas is irradiated by a high-energy ultraviolet lamp beam to decompose organic matters.

Further, the ultraviolet wavelength of the high-energy ultraviolet lamp is 182nm, 254nm or 365 nm.

Further, the spraying and washing device comprises a cross-flow washing tank, a packed bed positioned in the cross-flow washing tank, a spraying structure positioned at the top of the packed bed and a circulating water tank, wherein in the cross-flow washing tank, waste gas horizontally passes through one or more packed beds to be purified, the packed bed is cleaned from the top, cleaning liquid is sprayed on the top of the packed bed and flows through the packed bed to enter the circulating water tank, and NEW BIO-C deodorizing liquid is added into the circulating water tank.

Further, the gas distribution device distributes gas to the peculiar smell controller, the peculiar smell controller comprises a deodorization diaphragm, deodorization microparticles are uniformly distributed on the surface of the deodorization diaphragm, the deodorization microparticles can rapidly and actively capture odor gas molecules in the air and wrap the odor particles to generate non-covalent combination, and sedimentation is generated due to the increase of specific gravity after combination.

A modified plastic extruder flue gas purification method comprises the following steps:

and (3) sealing and collecting: the waste gas of the modified plastic extruder is controlled in a fixed area by a gas collecting hood and a collecting air pipe and is sent to each waste gas treatment unit for purification under the action of a centrifugal fan;

primary filtration treatment: the chain of the chain type dust collector is additionally provided with glass fiber filter cloth and high-efficiency air filter cotton, and when waste gas passes through a filter layer formed by the glass fiber filter cloth and the high-efficiency air filter cotton, particulate matters, dust and grease in the gas are intercepted;

performing composite photocatalysis: decomposing organic matters in the waste gas under the irradiation of a lamp of a high-energy ultraviolet lamp beam;

and (3) washing with odor liquid: collecting and conveying the waste gas to a multi-stage cross-flow washing tank, wherein in the cross-flow washing tank, the gas horizontally passes through one or more packing beds to be purified, the packing is cleaned from the top, cleaning liquid is sprayed on the top of the packing and flows through the packing to enter a circulating water tank, and NEW BIO-C deodorizing liquid or hydrogen peroxide is added into the circulating water tank, so that various pollutants in the waste gas can be effectively removed;

and (3) dehydration treatment: when the gas with mist rises and passes through the spraying washing layer, the mist collides with the chemical washing layer and is attached to the surface of the chemical washing layer due to the inertia effect of rising mist, 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;

gas distribution and deodorization: the deodorization microparticles are uniformly distributed on the surface of the deodorization membrane, can quickly and actively capture odor gas molecules in the air, wrap the odor particles and generate non-covalent bonding, and generate sedimentation due to the increase of specific gravity after bonding;

discharging: the height of the flue is increased by more than 15 meters through a chimney for discharging.

Compared with the prior art, the modified plastic extruder flue gas purification device disclosed by the invention has the characteristics of diversity, variability, high pollution concentration, large treatment air volume and the like of the modified plastic extruder flue gas, and a treatment process is selected in a targeted manner so as to ensure that the waste gas can be discharged up to the standard after passing through the device.

1. The modified plastic extruder flue gas purification device is convenient to install and occupies a small area on site;

2. the operation process of the modified plastic extruder flue gas purification device is safe, stable and reliable, and the operation and maintenance are convenient;

3. the multiple treatment processes are combined into integrated equipment, and the borne waste gas concentration and component load are large;

4. the targeted selection treatment process for the components of the waste gas can better control the operation and maintenance cost of the system;

5. the equipment is made of stainless steel, so that the appearance and the service life of the system are guaranteed to the maximum extent;

6. the tail end of the waste gas treatment system is designed with a dry neutralization method (industrial deodorization membrane), which not only ensures the cost index of the discharged waste gas, but also can effectively control the odor concentration of the discharge outlet.

Drawings

FIG. 1 is a perspective view of a modified plastic extruder flue gas purification device of the present invention;

FIG. 2 is a flow chart of the flue gas purification method of the modified plastic extruder of the invention.

In the figure: 10. sealing the collection device; 20. a chain type dust remover; 30. a composite photocatalytic device; 40. a spray washing device; 50. a gas distribution device; 60. a odor controller; 70. a medium-low pressure centrifugal fan; 80. and (4) a chimney.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on 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 to 2, the modified plastic extruder flue gas purification device of the present invention includes a closed collection device 10, a chain type dust collector 20, a composite photocatalytic device 30, a spray washing device 40, a gas distribution device 50, a odor controller 60, a middle and low pressure centrifugal fan 70, and a chimney 80. The closed collecting device 10, the chain type dust collector 20, the composite photocatalysis device 30, the spraying and washing device 40, the gas distribution device 50, the odor controller 60, the medium-low pressure centrifugal fan 70 and the chimney 80 are sequentially communicated through connecting pipes.

The closed collecting device 10 comprises a gas collecting hood and a collecting air pipe, wherein the collecting air pipe is communicated with the gas collecting hood, and the gas collecting hood is communicated with the chain type dust remover 20.

The chain type dust collector 20 belongs to mechanical type filtration, the chain is attached with glass fiber filter cloth and high-efficiency air filter cotton, loose and porous filter materials are filled in a chain frame to be used as filter layers, when gas containing floccules, dust particles, particulate matters and grease mixtures passes through the filter layers, the gas and the filter layers are subjected to inertial collision and diffusion settlement and are directly intercepted, and the dust particles are trapped through the surfaces of the filter materials, so that the purification effect is achieved.

The chain type dust collector 20 is mainly characterized in that a chain frame, glass fiber filter cotton and active carbon filter cotton are arranged on a filter surface through which waste gas passes in a relatively closed space. Wherein the chain frame mainly plays a role in supporting and driving, and the glass fiber filter cotton and the active carbon filter cotton play a key role in filtering. The front section and the rear section of the filtering layer of the device are respectively provided with a differential pressure meter, and the differential pressure between the two sections sets the fluctuation range. When the waste gas containing grease, dust and particles passes through the filter layer, most of the grease, dust and particles in the waste gas are intercepted on the filter layer and are repeatedly filtered and intercepted, so that the intercepted objects on the filter layer are more and more, the permeability of the filter layer is smaller and smaller, and the pressure difference between the front section and the rear section of the filter layer is more and more. When the pressure difference exceeds a set range, the alarm of the electric control system is sounded, and meanwhile, a slag scraping plate in the device is started, and the trapped matter on the filter layer is scraped back and forth to restore normal work.

The composite photocatalytic device 30 is divided into a high-efficiency pretreatment section and a composite photocatalytic section, which are generally integrated, so that the floor space 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.

Ultraviolet lamp with specific wavelength is used as light energy donor for photocatalytic oxidation, and the photocatalyst nano particle can be excited to generate electron-hole pair and hole decomposing catalyst under the irradiation of ultraviolet light with certain wavelength. TiO2₂The photocatalytic oxidation is active hydroxyl (OH) and other active oxidation species (O)^2-，·OOH，H₂O₂) The result of the combined action. In TiO₂The OH group generated on the surface has high reactivity and reaction energy higher than that of various chemical bond energies in organic matters, and is added with O₂ ^-，·OOH，H₂O₂The synergistic effect of the active oxidation substances can quickly and effectively decompose the organic substances.

The rough reaction mechanism is:

H₂S+O₂、O^2-、O²⁺→SO₃+H₂O

NH₃+O₂、O^2-、O²⁺→NOx+H₂O

VOCs+O₂、O^2-、O²⁺→SO₃+CO₂+H₂O

the ultraviolet wavelength of the high-energy ultraviolet lamp is 182nm, 254nm or 365 nm.

The spray scrubber 40 comprises a multi-stage cross-flow scrubber in which the gas is purified after passing horizontally through one or more packed beds. The filler is cleaned from the top, and the cleaning liquid is sprayed on the top of the filler and flows into the circulating water tank after flowing through the filler. NEW BIO-C deodorizing liquid or hydrogen peroxide is added into the circulating water tank, so that various pollutants in the waste gas can be effectively removed.

The NEW BIO-C deodorizing liquid contains deodorizing particles, and the surfaces of the deodorizing particles can not only effectively adsorb peculiar smell molecules in the air, but also promote the change of the spatial configuration of the adsorbed peculiar smell 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+SO₄ ^2-+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

NH₂+NH₃→R-NH₂+N₂+H₂O

the gas distribution device 50 distributes gas to the odor controller 60, the Vaportek odor controller 60 is a core device, and the Vaportek deodorization membrane is a main deodorization unit. The VP deodorization microparticles are uniformly distributed on the surface of the membrane, and are brought out by utilizing air convection power to rapidly eliminate odor, and meanwhile, other external substances cannot be inhaled, 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.

When the modified plastic extruder flue gas purification device is used, the waste gas is controlled in a fixed area by the gas collecting hood and the collecting air pipe of the closed collecting device 10, and is sent to each waste gas treatment unit for purification under the action of the centrifugal fan, so as to achieve the aim of environment-friendly emission. The collected waste gas is sent to a pretreatment section for primary treatment under the action of a suction opening, a conveying air pipe and a fan. Floccules, particles, dust, grease and smoke in the waste gas are removed through the pretreatment of the chain type dust remover 20; most importantly, the method has the functions of removing grease and dust and provides conditions for lower-level treatment.

The pretreated flue gas is sent to a composite photocatalysis device 30, and under the lamp irradiation of a high-energy ultraviolet lamp beam, the photocatalytic oxidation of TiO2 is formed as a result of the combined action of active hydroxyl (OH) and other active oxidation substances (O2-,. OOH, H2O 2). OH groups generated on the surface of TiO2 have high reaction activity and reaction energy higher than that of various chemical bond energies in organic substances, and the synergistic effect of O2-,. OOH and H2O2 active oxidation substances is added, so that the organic substances can be rapidly and effectively decomposed (the main effect is to remove easily decomposed and oxidized waste gas components (benzene, toluene, xylene, non-methane total hydrocarbons, VOCs and the like, and only has good disinfection and deodorization effects) in a part of waste gas.

The exhaust gas treated by the composite photocatalytic device 30 is sent to a spray washing device 40 (also called as a deodorizing liquid washing device) for further treatment. Adding small amount of absorbent (New Bio-C plant extract) into the spray circulation solution. The odorous gas is fully contacted with the New Bio-C plant extract, and the odorous particles in the air or in the water are absorbed and removed by the New Bio-C plant extract. The treatment system can treat part of water-soluble components and biodegradable components in the waste gas, and can effectively reduce the concentration of peculiar smell.

The washed waste gas belongs to a gas-liquid mixing state, and most of water vapor in the gas needs to be removed through the treatment of a high-efficiency dehydration and dehumidification layer in order to avoid influencing the next treatment working section. 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, and the gravity sedimentation is achieved. (the main function is to intercept floccules in the gas and remove most of water vapor in the gas)

The odor gas pretreated by the previous stages still has the biggest odor pollution problem. At this time, the Vaportek odor controller 60 is adopted, and a medium-low pressure centrifugal fan 70 is used for blowing air (realizing variable frequency control), so that the deodorizing microparticles in the odor controller 60 are taken away, odor gas molecules in the air are rapidly and actively captured, and the odor particles are wrapped. Vaportek particles are natural oily deodorizing molecules, and the particles are in non-covalent combination with odor molecules through intermolecular nonpolar interaction, so that the molecules are greatly stabilized, the activity and the irritation of the molecules are reduced, and the odor is thoroughly removed. (main function: removal of malodors in exhaust gas to the point of emission).

The treated waste gas reaching the standard is discharged by being led to a height of more than 15 meters through a chimney 80.

The invention also relates to a modified plastic extruder flue gas purification method, which comprises the following steps:

primary filtration treatment: the chain of the chain type dust collector 20 is attached with glass fiber filter cloth and high-efficiency air filter cotton, and when waste gas passes through a filter layer formed by the glass fiber filter cloth and the high-efficiency air filter cotton, particulate matters, dust and grease in the gas are intercepted;

discharging: the height is increased by more than 15 meters through a chimney 80 for discharging.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims

1. The utility model provides a modified plastics extruder gas cleaning device, includes a plurality of connecting pipes, its characterized in that: modified plastics extruder gas cleaning device still includes airtight collection device, chain formula dust remover, compound photo-catalytic device, sprays washing device, gas distribution device and peculiar smell controller, airtight collection device, chain formula dust remover, compound photo-catalytic device, spray washing device, gas distribution device and peculiar smell controller pass through the connecting pipe communicates in proper order, airtight collection device with exhaust gas control at fixed area and pass through the connecting pipe gets into chain formula dust remover, waste gas warp get into after chain formula dust remover filters and gets into compound photo-catalytic device decomposes the organic matter, gets into again and sprays washing device washing preliminary deodorization, and waste gas after preliminary deodorization gets into again the gas distribution device reaches the peculiar smell controller is thoroughly deodorized.

2. The modified plastic extruder flue gas purification device of claim 1, wherein: the closed collecting device comprises a gas collecting hood and a collecting air pipe, the collecting air pipe is communicated with the gas collecting hood, and the gas collecting hood is communicated with the chain type dust remover.

3. The modified plastic extruder flue gas purification device of claim 1, wherein: the chain of the chain type dust collector is additionally provided with glass fiber filter cloth and high-efficiency air filter cotton, and when the waste gas passes through a filter layer formed by the glass fiber filter cloth and the high-efficiency air filter cotton, particulate matters, dust and grease in the gas are intercepted.

4. The modified plastic extruder flue gas purification device of claim 3, wherein: the chain type dust remover further comprises two differential pressure meters, an alarm and a slag scraping plate, wherein the two differential pressure meters are arranged at the front section and the rear section of the filter layer, when the differential pressure of the two differential pressure meters exceeds a set range, the alarm gives an alarm, and meanwhile, the slag scraping plate is started and scrapes trapped objects on the filter layer back and forth so as to restore normal work.

5. The modified plastic extruder flue gas purification device of claim 1, wherein: the composite photocatalytic structure comprises a pretreatment section, wherein the pretreatment section comprises a plurality of modularized composite fibers, and the composite fibers adsorb harmful chemical gases in waste gases.

6. The modified plastic extruder flue gas purification device of claim 5, wherein: the composite photocatalytic structure comprises a composite photocatalytic section, the composite photocatalytic section comprises a high-energy ultraviolet lamp, and waste gas is irradiated by a high-energy ultraviolet lamp beam to decompose organic matters.

7. The modified plastic extruder flue gas purification device of claim 6, wherein: the ultraviolet wavelength of the high-energy ultraviolet lamp is 182nm, 254nm or 365 nm.

8. The modified plastic extruder flue gas purification device of claim 1, wherein: the spraying and washing device comprises a cross-flow washing tank, a packed bed positioned in the cross-flow washing tank, a spraying structure positioned at the top of the packed bed and a circulating water tank, wherein in the cross-flow washing tank, waste gas horizontally passes through one or more packed beds to be purified, the packed bed is cleaned from the top, cleaning liquid is sprayed at the top of the packed bed and flows through the packed bed to enter the circulating water tank, and NEW BIO-C deodorizing liquid is added into the circulating water tank.

9. The modified plastic extruder flue gas purification device of claim 1, wherein: the gas distribution device is to peculiar smell controller gas distribution, peculiar smell controller includes deodorization diaphragm, deodorization microparticle evenly distributed in deodorization diaphragm surface, the deodorization microparticle can initiatively catch the foul smell gas molecule in the air rapidly to live the foul smell particle parcel and take place non-covalent bonding, owing to the increase of combining the back proportion, produce and subside.

10. The method for purifying the smoke of the modified plastic extruder is characterized by comprising the following steps of: