CN115193250A - Method and device for removing peculiar smell gas through multistage catalytic oxidation - Google Patents
Method and device for removing peculiar smell gas through multistage catalytic oxidation Download PDFInfo
- Publication number
- CN115193250A CN115193250A CN202210935328.7A CN202210935328A CN115193250A CN 115193250 A CN115193250 A CN 115193250A CN 202210935328 A CN202210935328 A CN 202210935328A CN 115193250 A CN115193250 A CN 115193250A
- Authority
- CN
- China
- Prior art keywords
- fluidized bed
- circulating fluidized
- catalyst
- waste gas
- gas
- 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
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
- B01D53/86—Catalytic 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
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
-
- 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
- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
-
- 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
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention provides a method and a device for removing odor gas by multistage catalytic oxidation, which adopt the process flows of dry filtration, electrochemical catalytic coupling and circulating fluidized bed catalytic oxidation; the device comprises a dry-type filtering device, an electrochemical catalytic coupling device and a circulating fluidized bed catalytic oxidation device, wherein a dry-type filtering component is arranged in the dry-type filtering device, and a DBD plasma module and a catalyst fixed bed are arranged in the electrochemical catalytic coupling device; the circulating fluidized bed catalytic oxidation device comprises a circulating fluidized bed device box body, and a circulating fluidized bed body and a catalyst regeneration box are arranged in the circulating fluidized bed device box body. The invention utilizes the reaction of a strong oxidizing substance and the odor; the strong oxidizing group is coupled with the normal temperature catalyst, so that the reaction activation energy is reduced, and the purification efficiency is improved; by utilizing the circulating fluidized bed device, the contact area of the catalyst and the odor gas is increased, the reaction time is prolonged, and the generation of secondary pollutants such as ozone is avoided while the purification efficiency is improved.
Description
The technical field is as follows:
the invention belongs to the technical field of environmental pollutant treatment, and particularly relates to a method and a device for removing odor gas through multistage catalytic oxidation.
Background art:
the odor is a substance causing unpleasant or unpleasant odor of a human body, and is a pollution problem sensed through olfaction. In recent years, the problem of odor pollution has attracted much attention among people, and environmental complaints caused by malodor/odor pollution are serious. The air pollution prevention and control law stipulates that 'an enterprise business unit and other production operators generate peculiar smell gas in production and operation activities, should select sites scientifically, set reasonable protection distance, and install a purification device or take other measures to prevent the emission of the peculiar smell gas'. Therefore, the odor treatment is not slow.
The odor components of the odor gas are complex, most odor gases have low odor threshold values and are toxic and harmful, for example, the odor threshold value of hydrogen sulfide is 0.0012, and the low-concentration hydrogen sulfide is contacted for a long time, so that neurasthenia syndrome, animal and plant nerve functional disorders and the like can be caused. Therefore, the requirement on the purification efficiency of the treatment technology is high for the odor gas with a low odor threshold value. The common treatment technologies in the market at present include an adsorption method, an absorption method, a combustion method, a biological method and the like. The conventional adsorption method and the absorption method have low purification efficiency, are difficult to meet market demands and cannot thoroughly solve the problem that peculiar smell disturbs residents; although the combustion method and the biological method have high purification efficiency, the problems of high investment cost and operation cost and the like are difficult to popularize in a large range. Therefore, research and development of odor treatment technology with high purification efficiency and low investment and operation cost become the focus of attention of technicians. Based on this, the invention provides a device and a method for removing odor gas by multi-stage catalytic oxidation, so as to solve the above problems.
The invention content is as follows:
the invention aims to provide a method and a device for removing peculiar smell gas by multistage catalytic oxidation, provides a combined process of dry filtration, electrochemical catalytic coupling and circulating fluidized bed catalytic oxidation, designs a peculiar smell gas treatment device with high purification efficiency and low investment and operation cost, and can solve the problems of low purification efficiency, high cost and easy generation of secondary pollution in the peculiar smell gas treatment process.
The invention adopts the following technical scheme:
the invention provides a method for removing odor gas by multistage catalytic oxidation, which comprises the following steps:
s1, pretreatment: pretreating peculiar smell waste gas by a dry filtering device to remove dust-containing particles and liquid drops in the waste gas;
s2, electrochemical catalytic coupling reaction: mixing the pretreated peculiar smell waste gas with atomized hydrogen peroxide, allowing the mixture to enter a DBD plasma reaction area, and generating high-activity free radical substances through the action of high-energy ions and background gas generated by double-medium barrier discharge to react with the peculiar smell waste gas and degrade the peculiar smell waste gas; the undegraded peculiar smell waste gas passes through a catalyst fixed bed, and the high-activity free radical substance is coupled with a normal-temperature catalyst, so that the reaction activation energy is reduced, and the peculiar smell waste gas is further degraded;
s3, catalytic reaction of a circulating fluidized bed: after the peculiar smell waste gas is subjected to electrochemical catalytic coupling reaction, most pollutants are degraded, and a small amount of the peculiar smell waste gas which is not completely reacted and active substances enter a circulating fluidized bed reactor, are further degraded under the action of a catalyst and are then discharged.
Further, in S2, the concentration of the exhaust gas with the peculiar smell of the inlet air and the power of the DBD plasma module are controlled in a linkage mode, and the power supply current is automatically adjusted according to the concentration of the exhaust gas with the peculiar smell, so that the power of the DBD plasma module is adjusted; and in S3, the reacted catalyst enters a catalyst regeneration device through a cyclone separator for heating regeneration, and the regenerated catalyst enters the circulating fluidized bed reactor again for recycling.
The invention provides a device for removing odor gas by multistage catalytic oxidation, which comprises a dry-type filtering device, an electrochemical catalytic coupling device and a circulating fluidized bed catalytic oxidation device which are sequentially communicated; a dry-type filtering component is arranged in the dry-type filtering device; a DBD plasma module and a catalyst fixed bed are sequentially arranged in the electrochemical catalytic coupling device along the gas flowing direction, and a normal-temperature catalyst is arranged in the catalyst fixed bed; the circulating fluidized bed catalytic oxidation device comprises a circulating fluidized bed device box body, wherein one or more groups of circulating fluidized bed bodies are arranged in the circulating fluidized bed device box body, and a catalyst is arranged in the circulating fluidized bed body. The method comprises the following steps of firstly enabling the peculiar smell waste gas to be treated to enter a dry-type filtering device, removing dust-containing particles and liquid drops in the waste gas under the action of a dry-type filtering component, then enabling the peculiar smell waste gas to enter an electrochemical catalytic coupling device, oxidizing the peculiar smell waste gas by a strong oxidant generated by a DBD plasma module, then enabling the peculiar smell waste gas to enter a catalyst fixed bed, further degrading the waste gas by coupling the strong oxidant with a normal-temperature catalyst, finally enabling the peculiar smell waste gas to enter a circulating fluidized bed catalytic oxidation device, degrading the waste gas by a circulating fluidized bed body, and discharging the degraded waste gas out of the device.
Furthermore, the dry type filtering device and the electrochemical catalytic coupling device are integrated to form an integrated device box body, and the dry type filtering component, the DBD plasma module and the catalyst fixed bed are sequentially distributed in the integrated device box body; and the integrated device box body is provided with an access hole.
Furthermore, a hydrogen peroxide storage tank, a booster pump and a spray pipe are arranged at the top of the electrochemical catalytic coupling device, and the spray pipe is connected with an atomizing nozzle; the atomization nozzle is arranged in the electrochemical catalytic coupling device; hydrogen peroxide in the hydrogen peroxide storage tank is sprayed inside the electrochemical catalytic coupling device through a booster pump, a spray pipe and an atomizing nozzle.
Furthermore, an odor concentration detector is arranged in the electrochemical catalytic coupling device and used for detecting odor concentration.
Furthermore, a transformer and a power cabinet are arranged in the electrochemical catalytic coupling device and used for supplying power to the DBD plasma module.
Furthermore, the inside venturi structure that is provided with of electrochemistry catalysis coupling device, DBD plasma module sets up in the venturi structure, can accelerate the face wind speed when waste gas passes through to the cooling of DBD plasma module heat dissipation.
Further, a catalyst regeneration device is also arranged in the circulating fluidized bed device box body; the catalyst regeneration device comprises a catalyst regeneration box, a cyclone separator and an electric heating plate; the circulating fluidized bed body is vertically arranged, the bottom of the circulating fluidized bed body is provided with an air inlet, and the top of the circulating fluidized bed body is provided with an air outlet; the cyclone separator is communicated with an air outlet of the circulating fluidized bed body, the catalyst regeneration box is arranged below the cyclone separator, the electric heating plate is arranged in the catalyst regeneration box, and the bottom of the catalyst regeneration box is communicated with the circulating fluidized bed body; the waste gas enters the circulating fluidized bed body for treatment, the treated waste gas and the catalyst in the circulating fluidized bed body enter the cyclone separator through the gas outlet, the gas is discharged upwards, the catalyst enters the catalyst regeneration box and is regenerated under the action of the electric heating plate, and the regenerated catalyst enters the circulating fluidized bed body again.
Furthermore, a spiral conveyor is arranged between the catalyst regeneration box and the circulating fluidized bed body, and the regenerated catalyst enters the circulating fluidized bed body through the spiral conveyor.
Furthermore, the circulating fluidized bed device box body is provided with a second waste gas inlet and a second waste gas outlet, the second waste gas inlet is arranged at the bottom of the circulating fluidized bed device box body, and the second waste gas outlet is arranged at the top of the bottom of the circulating fluidized bed device box body.
Furthermore, a filter screen and a static pressure box are arranged in the circulating fluidized bed device box body, the filter screen is installed below the circulating fluidized bed body, and the static pressure box is arranged below the filter screen.
The invention has the beneficial effects that:
(1) The method adopts an electrochemical catalytic coupling technology to treat the odor gas, utilizes the strong oxidizing radicals to couple the normal-temperature catalyst, reduces the reaction activation energy, and improves the purification efficiency of the odor gas, and compared with the traditional adsorption and absorption method, the method has the advantages of simple equipment, small occupied area, low investment cost and the like;
(2) According to the invention, the DBD plasma module and the inlet odor concentration detector are controlled in a linkage manner, and the power can be controlled by automatically adjusting the power supply current, so that the purification efficiency is ensured and the energy-saving effect is realized to the maximum extent;
(3) The invention adopts the circulating fluidized bed technology, increases the contact area of gas and fixed catalyst, prolongs the reaction time, increases the catalytic reaction airspeed, reduces the catalyst usage amount, and can effectively reduce the investment and operation cost;
(4) The circulating fluidized bed adopts the granular activated carbon to load the catalyst, and simultaneously adopts electric heating to heat, thereby realizing the regeneration of the catalyst, improving the purification efficiency, accelerating the decomposition rate of active substances such as ozone and the like, and avoiding the problem of secondary pollution.
Description of the drawings:
FIG. 1 is a schematic flow diagram of an embodiment of the present invention;
FIGS. 2-3 are schematic diagrams of a dry filter device and an electrochemical catalytic coupling device according to an embodiment of the present invention;
FIGS. 4-5 are schematic diagrams of a circulating fluidized bed catalytic oxidation unit according to an embodiment of the present invention;
the labels in the figures are:
1. a dry filtration device; 2. an electrochemical catalytic coupling device; 3. a circulating fluidized bed catalytic oxidation unit; 31. an integrated device box body; 32. an access hole; 41. a hydrogen peroxide storage tank; 42. a booster pump; 43. a spray pipe; 44. an atomizing spray head; 5. an odor concentration detector; 6. a dry filter assembly; 71. a venturi structure; 72. a transformer; 73. a power supply cabinet; 74. a DBD plasma module; 8. a fixed bed of catalyst; 9. a second exhaust gas inlet; 10. a second exhaust gas outlet; 11. a circulating fluidized bed device box body; 12. a static pressure box; 131. circulating the fluidized bed body; 132. a particulate catalyst; 133. a cyclone separator; 134. a catalyst regeneration tank; 135. an electrical heating plate; 136. a screw conveyor; 137. filtering with a screen; 14. a first exhaust gas inlet; 15. a first exhaust outlet.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a method for removing odor gas through multistage catalytic oxidation, including the following steps:
pretreatment: pretreating peculiar smell waste gas by a dry filtering device to remove dust-containing particles and liquid drops in the waste gas; the concentration of dust particles in the pretreated waste gas is lower than 1mg/m 3 。
(II) electrochemical catalytic coupling reaction: mixing the pretreated peculiar smell waste gas with atomized hydrogen peroxide, allowing the mixture to enter a DBD plasma reaction area, and generating high-energy ions and O by double-medium barrier discharge 2 、H 2 O 2 、N 2 And the like, generate high-activity free radical substances such as O, OH, N and the like, and react with the ammonia, hydrogen sulfide and other peculiar smell waste gases to degrade; passing the undegraded off-flavor exhaust gas through a fixed catalyst bed, O, OH, N, O 3 The high-activity free radical substances are coupled with the normal-temperature catalyst, so that the reaction activation energy is reduced, and the peculiar smell waste gas is further degraded; the treated air volume is controlled to be 10000-15000 m 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. The reaction space velocity of the catalyst at normal temperature is controlled to be 10000-20000 h -1 . The wind speed of the DBD plasma reaction module surface is controlled to be 3-5 m/s, the power is controlled to be 4-18 kw, the concentration of the air inlet odor and the power of the DBD plasma module are controlled in a linkage mode, and the power is adjusted by automatically adjusting the power supply current according to the odor concentration.
(III) circulating fluidized bed catalytic reaction: after the peculiar smell waste gas is subjected to electrochemical catalytic coupling reaction, most pollutants are degraded, and a small amount of incompletely reacted peculiar smell waste gas and O 3 When active substances enter a circulating fluidized bed reactor,further degraded by the catalyst and then discharged from the top of the apparatus. The catalytic reaction temperature is controlled to be 50-80 ℃, the air speed of the reaction surface of the circulating fluidized bed is controlled to be more than 4m/s, and the reaction space velocity is controlled to be 50000-120000 h -1 . The reacted catalyst enters a catalyst regeneration device through a cyclone separator for heating and regeneration, and the regenerated catalyst enters the circulating fluidized bed reactor again for recycling.
Example 2
Referring to fig. 2 to 5, an embodiment of the present invention provides a device for removing odor gas through multi-stage catalytic oxidation, including a dry filtering device 1, an electrochemical catalytic coupling device 2, and a circulating fluidized bed catalytic oxidation device 3, which are sequentially communicated; the dry filter device 1 and the electrochemical catalytic coupling device 2 are integrated into a whole to form an integrated device box 31. In other embodiments of the present invention, the dry filter device 1 and the electrochemical catalytic coupling device 2 may be separately disposed to form two independent structures that are communicated with each other.
Electrochemical catalytic coupling integrated device
Referring to fig. 2 to 3, in the present embodiment, the dry filter device 1 and the electrochemical catalytic coupling device 2 are integrated to form an integrated device housing 31, and the dry filter assembly 6, the DBD plasma module 74 and the catalyst fixed bed 8 are sequentially disposed along a gas flow direction in the integrated device housing 31 to form a pretreatment region, an electrochemical oxidation region and a catalyst degradation region. Wherein, the dry type filtering component 6 is a G4+ F7 combined type filtering component; a normal-temperature catalyst is arranged on the catalyst fixed bed 8; the integrated device case 31 is provided with a first exhaust gas inlet 14 and a first exhaust gas outlet 15, the first exhaust gas inlet 14 being provided on the side close to the dry filter assembly 6, and the first exhaust gas outlet 15 being provided on the side close to the catalyst fixed bed 8. The integrated device box 31 is provided with an access hole 32, so that the equipment can be conveniently overhauled.
In this embodiment, the top of the integrated device box 31 is provided with a hydrogen peroxide storage tank 41 (8-40L), a booster pump 42 and a spray pipe 43 which are made of stainless steel, the spray pipe 43 is connected with an atomizer 44, the backpressure of the atomizer 44 is selected to be 0.5-1 MPa, the atomizer 44 is arranged inside the integrated device box 31, and hydrogen peroxide in the hydrogen peroxide storage tank 41 is sprayed in an electrochemical catalytic coupling area through the booster pump 42, the spray pipe 43 and the atomizer 44 to form vaporific hydrogen peroxide.
In this embodiment, an odor concentration detector 5 is disposed in the electrochemical catalytic coupling area in the integrated device housing 31 for detecting the odor concentration. A transformer 72 and a power cabinet 73 are also arranged in the integrated device box 31 for supplying power to the DBD plasma module 74. In the embodiment, 2 layers of DBD plasma units are arranged in the electrochemical oxidation area, 4 DBD plasma modules are arranged in each unit, and each 4 DBD plasma modules are driven by 1 group of power cabinets and 1 group of transformers; be equipped with PLC control system in the power cabinet, can with foul smell concentration detection appearance chain control, can realize the regulation to power according to foul smell concentration automatically regulated supply current, can play energy-conserving effect well.
In this embodiment, a venturi structure 71 is disposed inside the electrochemical catalytic coupling device 2, and the DBD plasma module 74 is disposed inside the venturi structure 71. The waste gas and hydrogen peroxide are mixed and then enter a DBD plasma electrochemical oxidation area which is designed to be a Venturi structure 71, so that the surface air speed of the waste gas passing through can be accelerated, the DBD plasma module 74 is cooled by heat dissipation, and O caused by temperature rise in the early stage is avoided 3 Etc. are lost and cannot effectively react with odorous gases.
A catalyst fixed bed 8 is designed behind the DBD plasma, high-energy ions and active substances are coupled with a normal-temperature catalyst to oxidize and remove odor gas, the reaction activation energy is reduced, and the decomposition effect of the plasma on the odor gas such as ammonia, hydrogen sulfide and the like is further enhanced. The components of the normal-temperature catalyst material mainly comprise manganese ore type manganese oxide doped with potassium, magnesium, calcium, iron and other ions, and are compounded with metal oxides such as copper oxide, nickel oxide and the like to form a solid solution, the activity of the catalyst is enhanced by ion doping and solid solution modification technologies, the catalyst carrier is honeycomb-shaped, and the material can be an alumina carrier or cordierite.
The peculiar smell waste gas to be treated firstly enters a pretreatment area through a first waste gas inlet 14, dust-containing particles and liquid drops in the waste gas are removed under the action of a dry type filtering assembly 6, then enters an electrochemical oxidation area, is mixed with hydrogen peroxide, is oxidized by a strong oxidant generated by a DBD plasma module 74, then enters a catalyst fixed bed 8, is further degraded by coupling the strong oxidant with a normal-temperature catalyst, and finally is discharged into a circulating fluidized bed reaction device through a first waste gas outlet 15.
(II) circulating fluidized bed catalytic oxidation device
Referring to fig. 4 to 5, the circulating fluidized bed catalytic oxidation device 3 comprises a circulating fluidized bed device box body 11, the circulating fluidized bed device box body 11 is provided with a second waste gas inlet 9 and a second waste gas outlet 10, the second waste gas inlet 9 is arranged at the bottom of the circulating fluidized bed device box body 11, and the second waste gas outlet 10 is arranged at the top of the bottom of the circulating fluidized bed device box body 11; one or more groups of circulating fluidized bed bodies 131 and catalyst regeneration devices are arranged in the circulating fluidized bed device box body 11, and granular catalysts 132 are arranged in the circulating fluidized bed bodies 131.
In this embodiment, the catalyst regeneration device includes a catalyst regeneration tank 134, a cyclone 133, and an electric heating plate 135; the circulating fluidized bed body 131 is vertically arranged, the bottom of the circulating fluidized bed body is provided with an air inlet, and the top of the circulating fluidized bed body is provided with an air outlet; the cyclone separator 133 is communicated with the air outlet of the circulating fluidized bed body 131, the catalyst regeneration box 134 is arranged below the cyclone separator 133, the electric heating plate 135 is arranged inside the catalyst regeneration box 134, and the bottom of the catalyst regeneration box 134 is communicated with the circulating fluidized bed body 131; the waste gas enters the circulating fluidized bed body 131 for treatment, the treated waste gas and the granular catalyst 132 in the circulating fluidized bed body 131 enter the cyclone separator 133 through the gas outlet, the gas is discharged upwards, the granular catalyst 132 enters the catalyst regeneration box 134 for regeneration under the action of the electric heating plate 135, and the regenerated granular catalyst 132 enters the circulating fluidized bed body 131 again; a screw conveyor 136 is arranged between the catalyst regeneration box 134 and the circulating fluidized bed 131, and the regenerated catalyst enters the circulating fluidized bed 131 through the screw conveyor 136.
In this embodiment, a filter screen 137 and a static pressure box 12 are arranged in the circulating fluidized bed device box body 11, the filter screen 137 is installed below the circulating fluidized bed body 131, and the static pressure box 12 is arranged below the filter screen 137.
As shown in fig. 4-5, a small amount of odorous gas and O remain after the odorous waste gas is subjected to electrochemical catalytic coupling reaction 3 The active substances enter a circulating fluidized bed device box body 11 from a waste gas inlet 9, enter a circulating fluidized bed body 131 after being stabilized by a static pressure box 12, and a stainless steel filter screen 137 is arranged at an inlet of the circulating fluidized bed body 131; the granular catalyst 132 is in a suspended state under the action of wind force, so that the contact area of the exhaust gas and the granular catalyst 132 is increased, and the reaction time is prolonged; the purified gas enters the cyclone separator 133, the airflow changes from linear motion to circular motion, the granular catalyst 132 generates centrifugal force under the rotation action, when the particles collide with the wall of the cyclone separator 133, the particles fall down along the wall under the action of gravity, the purified gas is discharged from the top of the cyclone separator 133, and the top is provided with a stainless steel wire mesh to prevent the granular catalyst 132 from being blown out; the falling granular catalyst 132 enters a catalyst regeneration box 134, electric heating plates 135 are arranged on two sides of the box body, the heating temperature is controlled to be 50-80 ℃, and the catalyst regeneration is realized; the regenerated granular catalyst 132 is fed into the circulating fluidized bed for recycling by the screw conveyor 136.
In this embodiment, the granular catalyst 132 is loaded on the activated carbon adsorbent, and the main components of the granular catalyst 132 are activated manganese oxide, copper oxide, aluminum oxide, and auxiliary materials. A small amount of off-flavor gases and O adsorbed in the pores of the particulate catalyst 132 3 The active substances are decomposed under the action of the catalyst, the temperature of the regenerated granular catalyst 132 reaches 50-80 ℃, and researches show that the half-life of decomposition at 70 ℃ is 17min when ozone generated by taking air as a gas source is used, so that the self decomposition rate of the ozone is accelerated under the action of high temperature, and secondary pollution such as ozone in tail gas is avoided.
The scheme utilizes strong oxidizing substances such as hydroxyl free radicals (oxidation potential 2.80 eV), oxygen atoms (oxidation potential 2.42 eV), ozone (oxidation potential 2.07 eV) and the like to react with odor gases such as ammonia, hydrogen sulfide and the like; the strong oxidizing group is coupled with the normal temperature catalyst, so that the reaction activation energy is reduced, and the purification efficiency is improved; by utilizing the circulating fluidized bed device, the contact area of the catalyst and the odor gas is increased, the reaction time is prolonged, and the generation of secondary pollutants such as ozone is avoided while the purification efficiency is improved.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention, it should be noted that, for those skilled in the art, several modifications and decorations without departing from the principle of the present invention should be regarded as the protection scope of the present invention.
Claims (10)
1. The method for removing the odor gas by multistage catalytic oxidation is characterized by comprising the following steps:
s1, pretreatment: pretreating the peculiar smell waste gas by a dry type filtering device to remove dust-containing particles and liquid drops in the waste gas;
s2, electrochemical catalytic coupling reaction: mixing the pretreated peculiar smell waste gas with atomized hydrogen peroxide, allowing the mixture to enter a DBD plasma reaction area, and generating high-activity free radical substances through the action of high-energy ions and background gas generated by double-medium barrier discharge to react with the peculiar smell waste gas and degrade the peculiar smell waste gas; the undegraded peculiar smell waste gas passes through a catalyst fixed bed, and the high-activity free radical substance is coupled with a normal-temperature catalyst, so that the reaction activation energy is reduced, and the peculiar smell waste gas is further degraded;
s3, catalytic reaction of a circulating fluidized bed: after the peculiar smell waste gas is subjected to electrochemical catalytic coupling reaction, most pollutants are degraded, and a small amount of incompletely reacted peculiar smell waste gas and active substances enter the circulating fluidized bed reactor, are further degraded under the action of a catalyst in the circulating fluidized bed reactor and are discharged.
2. The method for removing the odor gas through the multistage catalytic oxidation as claimed in claim 1, wherein in S2, the concentration of the exhaust odor of the intake air and the power of the DBD plasma module are controlled in a linkage manner, and the power supply current is automatically adjusted according to the concentration of the exhaust odor, so as to adjust the power of the DBD plasma module;
and in S3, the reacted catalyst enters a catalyst regeneration device through a cyclone separator for heating regeneration, and the regenerated catalyst enters the circulating fluidized bed reactor again for recycling.
3. A device for removing peculiar smell gas by multistage catalytic oxidation is characterized in that,
comprises a dry-type filtering device (1), an electrochemical catalytic coupling device (2) and a circulating fluidized bed catalytic oxidation device (3) which are communicated in sequence;
a dry type filtering component (6) is arranged in the dry type filtering device (1);
a DBD plasma module (74) and a catalyst fixed bed (8) are sequentially arranged in the electrochemical catalytic coupling device (2) along the gas flowing direction, and a normal-temperature catalyst is arranged in the catalyst fixed bed (8);
the circulating fluidized bed catalytic oxidation device (3) comprises a circulating fluidized bed device box body (11), wherein one or more groups of circulating fluidized bed bodies (131) are arranged in the circulating fluidized bed device box body (11), and catalysts are arranged in the circulating fluidized bed bodies (131).
4. The apparatus for removing offensive odor gas by multistage catalytic oxidation according to claim 3,
the dry type filtering device (1) and the electrochemical catalytic coupling device (2) are integrated to form an integrated device box body (31), and the dry type filtering component (6), the DBD plasma module (74) and the catalyst fixed bed (8) are sequentially distributed in the integrated device box body (31);
and the integrated device box body (31) is provided with an access hole (32).
5. The apparatus for removing offensive odor gas by multistage catalytic oxidation according to claim 3,
the top of the electrochemical catalytic coupling device (2) is provided with a hydrogen peroxide storage tank (41), a booster pump (42) and a spray pipe (43), and the spray pipe (43) is connected with an atomizing nozzle (44);
the atomizing spray head (44) is arranged inside the electrochemical catalytic coupling device (2);
hydrogen peroxide in the hydrogen peroxide storage tank (41) is sprayed inside the electrochemical catalytic coupling device (2) through a booster pump (42), a spray pipe (43) and an atomizing nozzle (44).
6. The apparatus for removing offensive odor gas by multistage catalytic oxidation according to claim 3,
and an odor concentration detector (5) is arranged in the electrochemical catalytic coupling device (2) and is used for detecting odor concentration.
7. The apparatus for removing offensive odor gas by multistage catalytic oxidation according to claim 3,
the inside venturi structure (71) that is provided with of electrochemistry catalysis coupling device (2), DBD plasma module (74) sets up in venturi structure (71), can accelerate the face wind speed when waste gas passes through to cool down to DBD plasma module (74) heat dissipation.
8. The apparatus for removing offensive odor gas by catalytic oxidation in multiple stages according to claim 3,
a catalyst regeneration device is also arranged in the circulating fluidized bed device box body (11);
the catalyst regeneration device comprises a catalyst regeneration box (134), a cyclone separator (133) and an electric heating plate (135);
the circulating fluidized bed body (131) is vertically arranged, the bottom of the circulating fluidized bed body is provided with an air inlet, and the top of the circulating fluidized bed body is provided with an air outlet;
the cyclone separator (133) is communicated with an air outlet of the circulating fluidized bed body (131), the catalyst regeneration box (134) is arranged below the cyclone separator (133), the electric heating plate (135) is arranged in the catalyst regeneration box (134), and the bottom of the catalyst regeneration box (134) is communicated with the circulating fluidized bed body (131);
the waste gas enters the circulating fluidized bed body (131) for treatment, the treated waste gas and the catalyst in the circulating fluidized bed body (131) enter the cyclone separator (133) through the gas outlet, the gas is discharged upwards, the catalyst enters the catalyst regeneration box (134) for regeneration under the action of the electric heating plate (135), and the regenerated catalyst enters the circulating fluidized bed body (131) again.
9. The apparatus for removing offensive odor gas by multistage catalytic oxidation according to claim 3,
the circulating fluidized bed device box body (11) is provided with a second waste gas inlet (9) and a second waste gas outlet (10), the second waste gas inlet (9) is arranged at the bottom of the circulating fluidized bed device box body (11), and the second waste gas outlet (10) is arranged at the top of the bottom of the circulating fluidized bed device box body (11).
10. The apparatus for removing offensive odor gas by multistage catalytic oxidation according to claim 3,
a filter screen (137) and a static pressure box (12) are arranged in a circulating fluidized bed device box body (11), the filter screen (137) is installed below a circulating fluidized bed body (131), and the static pressure box (12) is arranged below the filter screen (137).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210935328.7A CN115193250A (en) | 2022-08-05 | 2022-08-05 | Method and device for removing peculiar smell gas through multistage catalytic oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210935328.7A CN115193250A (en) | 2022-08-05 | 2022-08-05 | Method and device for removing peculiar smell gas through multistage catalytic oxidation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115193250A true CN115193250A (en) | 2022-10-18 |
Family
ID=83585802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210935328.7A Pending CN115193250A (en) | 2022-08-05 | 2022-08-05 | Method and device for removing peculiar smell gas through multistage catalytic oxidation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115193250A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116651194A (en) * | 2023-05-26 | 2023-08-29 | 上海沃德鑫丰环保科技有限公司 | Exhaust gas treatment method and device |
-
2022
- 2022-08-05 CN CN202210935328.7A patent/CN115193250A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116651194A (en) * | 2023-05-26 | 2023-08-29 | 上海沃德鑫丰环保科技有限公司 | Exhaust gas treatment method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105521705A (en) | Method for treating organic waste gas through low-temperature plasma concerted catalysis | |
| CN108543418B (en) | Slot type waste gas purifying device capable of being combined in multiple stages | |
| CN206778161U (en) | A kind of fitting space air purifying device of automatic control transfusion | |
| CN202778234U (en) | Combined-type organic waste gas treatment device | |
| CN107029527A (en) | A kind of fitting space peculiar smell purification method and device | |
| CN107469597A (en) | A kind of waste gas waste water coupling purification system and its purification method based on electrochemistry | |
| CN104383812A (en) | VOCs (volatile organic chemicals) low-temperature plasma combined treatment system | |
| CN103055669A (en) | Exhaust purification treatment method and device | |
| CN106823798A (en) | A kind of ultrasonic synergistic ultraviolet light cleaning organic waste gas device and processing method | |
| CN104043321A (en) | System for purifying exhaust gas generated during baking of enamelled wires | |
| CN107569987A (en) | A kind of processing method and processing device of middle low concentration VOCs gases | |
| CN206965478U (en) | A kind of photoelectricity ion deodorizing device | |
| CN115193250A (en) | Method and device for removing peculiar smell gas through multistage catalytic oxidation | |
| CN205760609U (en) | A kind of device for low-temperature plasma synergistic catalysis treatment organic exhaust gas | |
| CN110772981A (en) | Waste gas purification system for rubber tire | |
| CN218459131U (en) | Device for removing peculiar smell gas through multistage catalytic oxidation | |
| CN115722052B (en) | Device and method for removing volatile organic compounds in industrial waste gas | |
| CN111514744A (en) | Handle organic waste gas's multistage catalytic oxidation tower | |
| CN110917842A (en) | Multiple-effect-in-one organic waste gas purification method and system | |
| CN207102274U (en) | Gas cleaning plant | |
| CN202105577U (en) | Organic waste gas treatment device | |
| CN203315988U (en) | Combined waste gas purifier | |
| CN204320098U (en) | VOCs low-temperature plasma multiple treating system | |
| CN215311444U (en) | Low-concentration and large-air-volume organic waste gas purification device | |
| CN204275780U (en) | For the energetic ion generator of the plasma handling system of waste gas |
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 |