CN211216181U - Exhaust gas treatment system - Google Patents
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- CN211216181U CN211216181U CN201922048654.2U CN201922048654U CN211216181U CN 211216181 U CN211216181 U CN 211216181U CN 201922048654 U CN201922048654 U CN 201922048654U CN 211216181 U CN211216181 U CN 211216181U
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Abstract
The utility model provides a waste gas treatment system, waste gas treatment system includes micro-nano bubble generating device, air supply feeding device, pressurization processing device, catalytic oxidation reaction unit, forms micro-nano bubble catalytic oxidation system and treats the processing waste gas and degrade the desorption, the utility model forms regeneration micro-nano bubble through the pressurization processing of pressurization processing device, and forms micro-nano bubble catalytic oxidation system through catalytic oxidation reaction unit, degrades the desorption to the waste gas based on active oxygen or free radical, and the suitability is wide, can process water-soluble aldehyde, ketone VOCs and non-water-soluble benzene, various VOCs such as toluene VOCs, need not to treat waste gas and dehumidify, pretreatment measures such as concentration, can realize the high efficiency, low-cost catalytic oxidation degradation and desorption of VOCs organic waste gas under the milder condition, the operating efficiency is higher, the treatment cost is lower, the environment is protected, no toxicity is caused, and the degraded waste gas can be discharged after simple treatment.
Description
Technical Field
The utility model belongs to the technical field of exhaust-gas treatment, especially, relate to an exhaust-gas treatment system.
Background
Volatile Organic Compounds (VOCs) are pollutants commonly existing in indoor and outdoor air and industrial emissions, and have complex components, mainly including hydrocarbons, alcohols, aldehydes, lipids, halogenated hydrocarbons, polycyclic aromatic hydrocarbons with low boiling point, and the like. VOCs are important precursors formed by haze, ozone and the like, have the characteristics of irritation, toxicity, flammability, explosiveness and the like, and cause serious harm to environmental ecology and human health. Therefore, the treatment of the VOCs has become a hot problem in the current environmental protection field.
The VOCs treatment methods commonly used at present include absorption, condensation, adsorption, biological, thermal oxidation, plasma, electrochemical, membrane separation, photocatalysis and electron bed heating. However, the above methods have some disadvantages, for example, the adsorbent regeneration cost is high; the condensation method is suitable for recovering VOCs with high concentration and better economic benefit; the catalyst of the catalytic combustion method has selectivity, has secondary pollution risk and higher input cost; the manufacturing cost of the membrane separation method element is high, and the service life is short; the biological method equipment occupies a large space and is greatly influenced by temperature and impact load. For toxic, harmful and non-recyclable VOCs, the thermal oxidation method is a relatively thorough treatment method. At present, the oxidation method can be divided into a catalytic oxidation method and a thermal oxidation method, catalysts used in the catalytic oxidation method are mainly divided into a noble metal catalyst and a non-noble metal catalyst, the noble metal catalyst is distributed on a catalyst carrier in the form of ultrafine particles, the carrier is generally a metal or ceramic honeycomb and a bulk filler, the non-noble metal catalyst is mostly a catalyst prepared by mixing a transition element metal oxide and an adhesive and then preparing into various shapes, the thermal oxidation method can be divided into a thermal combustion type, a partition wall type and a heat accumulation type, and the main difference of the thermal oxidation method is different from a heat recovery mode, but the oxidation methods have the problems of high energy consumption, high input cost and the like. At present, the search for more efficient treatment methods is the main direction for treating VOCs in the future.
Therefore, how to provide an exhaust gas treatment system to solve the above problems is necessary.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an exhaust gas treatment system for solving the problems in the prior art that it is difficult to effectively treat the VOCs exhaust gas.
To achieve the above and other related objects, the present invention provides an exhaust gas treatment system, comprising:
the micro-nano bubble generating device is used for generating primary micro-nano bubbles;
the gas source supply device is communicated with the micro-nano bubble generation device and is used for providing a gas source required for generating the primary micro-nano bubbles into the micro-nano bubble device;
the pressurization processing device is communicated with the micro-nano bubble generating device, receives the primary micro-nano bubbles and performs pressurization processing on the primary micro-nano bubbles to form regenerated micro-nano bubbles;
the catalytic oxidation reaction device comprises a reaction chamber, a waste gas inlet and a clean gas outlet, wherein the reaction chamber is communicated with the pressurization treatment device to receive the regenerated micro-nano bubbles, a catalyst is added in the reaction chamber to form a micro-nano bubble catalytic oxidation system based on the regenerated micro-nano bubbles and the catalyst, the waste gas inlet is used for inputting waste gas to be treated into the reaction chamber to treat the waste gas to be treated based on the micro-nano bubble catalytic oxidation system, and the clean gas outlet is used for discharging purified gas obtained after the waste gas to be treated is treated by the micro-nano bubble catalytic oxidation system;
the reaction chamber is also communicated with the micro-nano bubble generating device so as to input the liquid in the reaction chamber into the micro-nano bubble generating device to be used as a liquid source required for generating the primary micro-nano bubbles.
Optionally, the micro-nano bubble generation device includes any one of a gas-liquid mixing pump and a porous plate.
Optionally, the gas source supply device comprises an ozone generator, and the ozone generator is communicated with a pipeline between the micro-nano bubble generation device and the catalytic oxidation reaction device.
Optionally, the pressurization processing device includes at least one of a pressurization pipe and a pressure tank, and when the pressurization processing device includes the pressurization pipe and the pressure tank, the pressurization pipe is disposed in series with the pressure tank.
Optionally, the pressurization processing device is communicated with the reaction chamber of the catalytic oxidation reaction device through a spray liquid circulation pipeline, the spray liquid circulation pipeline comprises a spray liquid release nozzle, and the spray liquid release nozzle comprises a swirl nozzle.
Optionally, the catalytic oxidation reaction device further comprises an acid-base concentration monitoring device communicated with the reaction chamber.
Optionally, the catalytic oxidation reaction device further comprises a gas-liquid separation device, the gas-liquid separation device is communicated with both the reaction chamber and the purified gas outlet, and the purified gas is discharged from the purified gas outlet through the gas-liquid separation device.
Optionally, the catalytic oxidation reaction device further comprises a heating device to heat the reaction chamber.
Optionally, the catalytic oxidation reaction device further includes an oxidant inlet for inputting an oxidant into the reaction chamber, the regenerated micro-nano bubbles, the catalyst and the oxidant constitute the micro-nano bubble catalytic oxidation system, wherein the oxidant includes at least one of hydrogen peroxide, ferric chloride, ferric sulfate, sodium ferrite, potassium ferrite, peracetic acid, sodium dichromate, potassium dichromate, chromic acid, nitric acid, potassium permanganate, sodium persulfate, potassium persulfate, ammonium persulfate, sodium ferrate, potassium ferrate, sodium hypochlorite, sodium percarbonate, sodium perborate, and potassium perborate.
Optionally, the catalyst in the catalytic oxidation reaction device includes at least one of a non-noble metal catalyst and a noble metal catalyst, wherein the non-noble metal catalyst includes at least one of ferric chloride, ferric sulfate, ferrous chloride, ferrous sulfate, cupric chloride and cupric sulfate, and the noble metal catalyst includes at least one of gold, platinum and palladium.
The utility model also provides an exhaust-gas treatment method, exhaust-gas treatment method includes following step:
providing an exhaust treatment system according to any of the preceding claims;
starting the waste gas treatment system and at least adding the catalyst into the reaction chamber of the catalytic oxidation reaction device to form the micro-nano bubble catalytic oxidation system;
and introducing the waste gas to be treated into the reaction chamber, treating the waste gas to be treated based on the micro-nano bubble catalytic oxidation system, and discharging the purified gas based on the purified gas outlet.
Optionally, the pressure for pressurizing the primary micro-nano bubbles based on the pressurizing device is between 0.1Mpa and 1.5 Mpa; the temperature of the liquid in the reaction chamber is controlled between 25 ℃ and 70 ℃; the gas source includes at least one of air, oxygen, and ozone.
Optionally, the process of generating the primary micro-nano bubbles based on the micro-nano bubble generation device further includes a step of controlling a ratio of the gas source to the liquid source, where the ratio of the gas source to the liquid source is controlled to be between 1:1 and 1: 20.
Optionally, the process of forming the micro-nano bubble catalytic oxidation system further includes a step of adding an oxidant, the regenerated micro-nano bubbles, the catalyst and the oxidant form the micro-nano bubble catalytic oxidation system, wherein the concentration of the oxidant is between 0.1% and 5%, and the oxidant includes at least one of hydrogen peroxide, ferric chloride, ferric sulfate, sodium ferrite, potassium ferrite, peroxyacetic acid, sodium dichromate, potassium dichromate, chromic acid, nitric acid, potassium permanganate, sodium persulfate, potassium persulfate, ammonium persulfate, sodium ferrate, potassium ferrate, sodium percarbonate, sodium perborate and potassium perborate.
Optionally, the catalyst in the catalytic oxidation reaction device includes at least one of a non-noble metal catalyst and a noble metal catalyst, wherein the non-noble metal catalyst includes at least one of ferric chloride, ferric sulfate, ferrous chloride, ferrous sulfate, cupric chloride and cupric sulfate, and the noble metal catalyst includes at least one of gold, platinum and palladium.
As above, the utility model discloses an exhaust-gas treatment system, pressurization through pressurization processing apparatus forms the micro-nano bubble of regeneration, and form micro-nano bubble catalytic oxidation system through catalytic oxidation reaction unit, based on active oxygen or free radical carry out the degradation desorption to waste gas, wide applicability, can handle aldehydes, water-soluble VOCs such as ketones, benzene class, water-insoluble VOCs such as toluenes, need not to treat waste gas (like VOCs waste gas) and dehumidify, pretreatment measures such as concentration, can realize VOCs organic waste gas's high efficiency under milder condition, low-cost catalytic oxidation degradation and desorption, the operating efficiency is higher, the treatment cost is lower, environmental protection is nontoxic, waste gas can discharge through simple processing.
Drawings
Fig. 1 shows a schematic structural diagram of each device of the waste gas treatment system of the present invention.
FIG. 2 is a flow chart of the method for treating waste gas according to the present invention.
Fig. 3 shows a scanning picture of the micro-nano bubble regeneration system of the present invention.
Description of the element reference numerals
100 micro-nano bubble generating device
101 ozone generator
102 pressure treatment device
103 catalytic oxidation reaction device
103a reaction chamber
103b waste gas inlet
103c clean gas outlet
S1-S3
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
As in the detailed description of the embodiments of the present invention, the cross-sectional views illustrating the device structure are not partially enlarged in general scale for convenience of illustration, and the schematic views are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
For convenience in description, spatial relational terms such as "below," "beneath," "below," "under," "over," "upper," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these terms of spatial relationship are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. Further, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.
In the context of this application, a structure described as having a first feature "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed in between the first and second features, such that the first and second features may not be in direct contact. In addition, the similar descriptions of "at least one" or "at least one" and the like indicate that one of a plurality of the elements may be selected, or that a combination of two or more of the plurality of the elements may be selected.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
As shown in fig. 1, the utility model provides an exhaust gas treatment system, exhaust gas treatment system includes: micro-nano bubble generation device 100, air supply feeding device, pressurization processing apparatus 102 and catalytic oxidation reaction unit 103, wherein:
the micro-nano bubble generating device 100 is configured to generate primary micro-nano bubbles, and a gas source and a liquid source are introduced into the micro-nano bubble generating device 100 and mixed to form the primary micro-nano bubbles, where the liquid source may be liquid from the catalytic oxidation reaction device 103, and this liquid may be liquid when exhaust gas to be processed is not processed, such as the liquid may be the catalyst already added in the reaction chamber 103a, and of course, may also be remaining liquid after the exhaust gas to be processed is processed by the micro-nano bubble catalytic oxidation system, that is, spray liquid circulating in the circulating exhaust gas processing system, that is, the reaction chamber 103a of the catalytic oxidation reaction device 103 is communicated with the micro-nano bubble generating device 100, and the liquid is input into the micro-nano bubble generating device 100 for recycling, in addition, an additional liquid may be added to the micro-nano bubble generation apparatus 100 to form a liquid source for generating the primary micro-nano bubbles, for example, the additional liquid may be water, and is selected according to actual requirements.
Specifically, in an example, the primary micro-nano bubbles may be generated by dispersing air, wherein the nano bubble generating device includes a gas-liquid separation pump (dissolved air pump), and of course, the micro-nano bubble generating device may also be other devices capable of generating micro-nano bubbles, such as a porous plate structure, and a cross section of the micro-nano bubble generating device belongs to a honeycomb structure. In an optional example, the gas-liquid separation pump is communicated with the gas source supply device and the catalytic oxidation reaction device 103, and the gas source and the liquid source realize rotational flow mixing in the gas-liquid separation pump, that is, primary bubble cutting is realized, so that the primary micro-nano bubbles after primary bubble cutting are obtained. In another example, the gas source and the liquid source are fed into the gas-liquid mixing pump in preset proportion based on the step of controlling the proportion of the gas source to the liquid source by the gas-liquid mixing pump, the dosage and adjustment can be realized by a gas flowmeter and a liquid flowmeter, and optionally, the proportion of the gas source to the liquid source is controlled to be between 1:1 and 1:20, preferably between 1:10 and 1: 15.
The gas source supply device is communicated with the micro-nano bubble generation device 100, and is configured to provide a gas source required for generating the primary micro-nano bubbles to the micro-nano bubble device, where the gas source supply device may be a device that realizes negative pressure inspiration, so that the gas source enters the bubble preparation system based on the negative pressure inspiration and enters the micro-nano bubble generation device, and of course, the gas source may also be provided to the micro-nano bubble generation device by pressure, where the gas source includes at least one of air, oxygen, and ozone, and the gas source supply device is adopted to input the gas source to the micro-nano bubble generation device 100, for example, in an optional example, the gas source is selected to be ozone, the gas source supply device is selected to be an ozone generator 101, and the ozone generator 101 inputs the gas source into the micro-nano bubble generation device 100, for example, the gas source is input into the gas-liquid separation pump, in a preferred embodiment, the gas source supply device (such as the ozone generator 101) is connected to a communicating pipeline between the micro-nano bubble generation device 100 and the catalytic oxidation reaction device 103, as shown in fig. 1, the gas source and the spray liquid are mixed in the communicating pipeline and then input into the micro-nano bubble generation device, so as to improve the generation efficiency of the primary micro-nano bubbles. Of course, in other examples, the gas source may also be directly input into the micro-nano bubble generating device 100 through a pipeline or the like.
The pressurization processing device 102 is communicated with the micro-nano bubble generating device 100, the pressurization processing device 102 receives the primary micro-nano bubbles and performs pressurization processing on the primary micro-nano bubbles to form the regenerated micro-nano bubbles, wherein the pressurization processing device 102 is provided in the present invention, and performs pressurization processing on the primary micro-nano bubbles output by the micro-nano bubble generating device 100, so as to convert the performance of the primary micro-nano bubbles based on the pressurization processing, so that the primary micro-nano bubbles become bubbles with the capability of forming active oxygen or free radicals, i.e. the regenerated micro-nano bubbles are formed, one example of which is shown in fig. 3, for example, the size of the primary micro-nano bubbles can be bubbles of tens of micrometers to millimeter scale, such as 100 μm-0.5mm, and the capability of forming free radicals is weaker, after the micro-nano bubbles are modified by adopting a pressurization treatment mode, the micro-nano bubbles can be hundreds of nanometers to dozens of micrometers in size, such as 100nm-20 micrometers, and can be 200nm, 500nm, 5 micrometers, 10 micrometers and the like, and have the capability of forming a large amount of active oxygen or free radicals, so that the generated active oxygen or free radicals can be utilized to perform catalytic oxidation degradation treatment on the subsequently input waste gas to be treated so as to remove the waste gas to be treated, after the pressurization treatment is performed, the generated micro-nano bubbles are increased in quantity and smaller in size, have the characteristics of long retention time in water, high interface zeta potential, self pressurization dissolution, large amount of free radicals released at the moment of fracture and the like, and can generate more active oxygen or free radicals, in addition, the pressurization and gas dissolution method realized by the pressurization device can be combined with a dispersed air method to obtain the regenerated micro-nano bubbles, the micro-nano bubble generation effect with low energy consumption and high efficiency is realized.
Specifically, in an example, the pressurization processing device 102 includes at least one of a pressurization pipeline and a pressure tank, when the pressurization processing device 102 is selected as the pressurization pipeline, one end of the pressurization pipeline is communicated with the micro-nano bubble generation device 100 to receive the primary micro-nano bubbles, and the other end outputs the regenerated micro-nano bubbles generated by the pressurization pipeline processing, when the pressurization processing device 102 is selected as the pressure tank, the communication between the pressure tank and the micro-nano bubble generation device 100 and the catalytic oxidation reaction device 103 can be realized through a communication pipeline, of course, in an example, the pressurization processing can be performed twice in a manner that the pressurization pipeline and the pressure tank are connected in series for use, the order of the serial connection of the two pressurization pipelines is actually selected, in other examples, the number of the pressure tank and the pressurization pipeline can be multiple, the arrangement mode can be selected according to the actual mode, if the mode that the two are arranged at intervals is selected, the generation effect of the regenerated micro-nano bubbles can be improved, and the waste gas treatment efficiency is improved.
Specifically, in an example, the pressure for pressurizing the primary micro-nano bubbles based on the pressurization processing device 102 is between 0.1Mpa and 1.5Mpa, preferably 0.5Mpa and 1.2Mpa, such as 0.25Mpa, 0.3Mpa, and 1.0Mpa, so that the primary micro-nano bubbles are converted into the regeneration micro-nano bubbles.
The catalytic oxidation reaction device 103 includes a reaction chamber 103a, the reaction chamber 103a is communicated with the pressurization processing device 102 to receive the regenerated micro-nano bubbles, the reaction chamber 103a may be a reaction tank, the catalytic oxidation reaction device 103 may be a purification tower, a catalyst is added to the reaction chamber 103a to form a micro-nano bubble catalytic oxidation system based on the received regenerated micro-nano bubbles and the catalyst, wherein the catalyst may be added in the reaction chamber 103a in advance, or may be added to the reaction chamber 103a after starting the exhaust gas treatment system, in one example, the catalytic oxidation reaction device 103 is provided with a catalyst inlet communicated with the reaction chamber 103a, and the catalyst is added from the catalyst inlet, in the present invention, regenerated micro-nano bubble is several hundred nanometers to tens of microns's yards, has that aquatic dwell time is long, interface zeta potential is high, self pressure boost dissolves, breaks the characteristics such as release free radical volume is big in the twinkling of an eye, can form a large amount of micro-nano bubble water that is rich in active oxygen, and is further, this application obtains regenerated micro-nano bubble above-mentioned effect can be very big enhancement after adding the catalyst, thereby can obtain micro-nano bubble catalytic oxidation system, based on micro-nano bubble catalytic oxidation system is right pending waste gas degrades, with the help of the catalyst improves the ability that active oxygen or free radical produced, and combines pressurization processing of pressurization processing apparatus 102 improves the efficiency of waste gas degradation, reduces the pollution, practices thrift the cost. In a preferred example, the catalytic oxidation reaction apparatus 103 further includes an oxidant inlet for inputting an oxidant into the reaction chamber 103a, the regenerated micro-nano bubbles, the catalyst and the oxidant constitute the micro-nano bubble catalytic oxidation system, and the addition of the catalyst and the oxidant can significantly improve the ability of the micro-nano bubbles to be converted into active oxygen or free radicals, and the micro-nano bubble catalytic oxidation system of this example combines with the pressurization treatment of the pressurization treatment apparatus 102 to prepare a large amount of micro-nano bubble water rich in active oxygen (the free radicals) and having super-strong oxidation ability by means of the micro-nano bubble generation apparatus 100, so as to treat the waste gas under a mild condition, such as to achieve high-efficiency, low-cost catalytic oxidation degradation and removal of VOCs organic waste gas The treatment cost is lower, and the method is an environment-friendly, energy-saving and efficient new technology, and can effectively make up for the defects of the existing oxidation method and other VOCs treatment technologies in the current market. Additionally, the utility model discloses utilize micro-nano bubble catalytic oxidation system has more extensive application for the micro-nano bubble of monomer, and the micro-nano bubble of monomer is limited to the VOCs effect, the utility model discloses can carry out the effective processing to multiple VOCs, in an example, pending waste gas includes VOCs (Volatile Organic Compounds), water-soluble VOCs such as aldehyde, ketone, non-water-soluble VOCs such as benzene, toluene all can handle difficult oxidative degradation's VOCs, wherein the utility model discloses it is right based on active oxygen or free radical pending waste gas is handled, and active oxygen or free radical redox potential are higher, the utility model discloses the VOCs kind that can oxidize is many.
Specifically, the catalyst comprises at least one of a non-noble metal catalyst and a noble metal catalyst, wherein the non-noble metal catalyst comprises at least one of ferric chloride, ferric sulfate, ferrous chloride, ferrous sulfate, copper chloride and copper sulfate, and the noble metal catalyst comprises at least one of gold, platinum and palladium. The catalyst can realize a catalytic function in a homogeneous catalysis mode or a heterogeneous catalysis mode, and in one example, the concentration range of the catalyst is between 5mg/L and 5g/L, for example, 1g/L or 3g/L is selected, so that the treatment of the generated micro-nano bubble catalytic oxidation system on VOCs is further facilitated.
In addition, the oxidant comprises at least one of hydrogen peroxide, ferric chloride, ferric sulfate, sodium ferrite, potassium ferrite, peroxyacetic acid, sodium dichromate, potassium dichromate, chromic acid, nitric acid, potassium permanganate, sodium persulfate, potassium persulfate, ammonium persulfate, sodium ferrate, potassium ferrate, sodium hypochlorite, sodium percarbonate, sodium perborate, and potassium perborate, wherein the concentration of the oxidant is between 0.1% and 5%, which can correspondingly increase the reaction rate, preferably between 0.5% and 1%.
As an example, the catalytic oxidation reaction device further includes a heating device, such as a heater, to heat the reaction chamber, and optionally, the catalytic oxidation reaction device further includes a temperature monitor to monitor the temperature of the liquid in the reaction chamber, in an example, the temperature of the liquid in the reaction chamber 103a is controlled between 25 ℃ and 70 ℃, preferably between 35 ℃ and 60 ℃, so that the exhaust gas treatment effect can be further improved.
The catalytic oxidation reaction device 103 further comprises a waste gas inlet 103b and a clean gas outlet 103c, the waste gas inlet 103b inputs waste gas to be treated into the reaction chamber 103a, so as to treat the waste gas to be treated based on the micro-nano bubble catalytic oxidation system, wherein the waste gas to be treated is introduced through the waste gas inlet 103b, in one example, the waste gas to be treated enters the reaction chamber 103a from the waste gas inlet 103b through a pipeline, an air outlet end of the pipeline directly extends into liquid of the reaction chamber 103a, such as directly extends into a catalyst which is added, and meanwhile, the regenerated micro-nano bubbles can be ejected from a spraying device above the reaction chamber 103a to form the micro-nano bubble catalytic oxidation system, so as to realize degradation of the waste gas to be treated, in one example, a plurality of spray heads are arranged in the reaction chamber 103a, the waste gas to be treated is sprayed out of the spray head and then contacts with the micro-nano bubble catalytic oxidation system, so that the contact area is enlarged, and the waste gas degradation efficiency is improved.
In addition, the purified gas obtained by processing the waste gas to be processed by the micro-nano bubble catalytic oxidation system is discharged from the purified gas outlet 103c, for example, in an example, the waste gas to be processed includes VOCs (Volatile Organic Compounds), the VOCs include at least one of water-soluble aldehyde VOCs, water-soluble ketone VOCs, water-insoluble benzene VOCs and water-insoluble toluene VOCs, and the VOCs are oxidized by the micro-nano bubble catalytic oxidation system to generate CO2、H2O and other intermediate degradation products, the purified gas includes all gases in the degradation products, such as CO2 gas, in one example, a gas-water separation device is further installed at the purified gas outlet 103c, an exhaust fan is arranged behind the gas-water separation device, so that discharged gas and water mist are separated, the phenomenon that the outlet gas carries water is reduced, the dryness of the discharged gas is improved, and the separated water mist is returned to the system and is firstly input into the micro-nano bubble generation unit for recycling, so that the operation cost is reduced. The VOCs include, but are not limited to, VOCs produced by chemical, petroleum, coating, printing, spraying, packaging, and the like, in one exampleThe concentration of VOCs in the exhaust gas treatment system is between 0ppm and 3000ppm, such as between 50 ppm and 1000ppm, and can be treated based on the exhaust gas treatment system.
As an example, the pressurization processing device 102 is communicated with the reaction chamber 103a of the catalytic oxidation reaction device 103 through a spray liquid circulation pipeline, wherein the spray liquid circulation pipeline includes a spray liquid release nozzle, the spray liquid release nozzle includes a swirl nozzle, in this example, based on the swirl nozzle, the micro-nano bubbles rich in active oxygen or free radicals after being processed by the pressurization processing device 102 can be cut, when the micro-nano bubble generating device 100 generates the primary micro-nano bubbles by using a dispersed air method, primary bubble cutting occurs, and after pressurization processing, secondary swirl mixing is performed to realize secondary bubble cutting, thereby maximally increasing the generation amount of the micro-nano bubbles, reducing the size of the micro-nano bubbles, reducing the energy consumption of equipment, and further facilitating improvement of the performance of the micro-nano bubble catalytic oxidation system of the present invention, the generation capacity of active oxygen or free radicals is improved, and the degradation and removal efficiency of waste gas is improved.
As an example, an acid-base concentration monitoring device, such as an acid-base concentration monitor, is further disposed in the catalytic oxidation reaction device 103 to monitor the concentration of the liquid acid or the liquid base in the reaction chamber 103a, so as to control the catalytic oxidation degradation system in an appropriate pH range, and an appropriate pH value can be adjusted according to each catalyst and oxidant, so as to ensure the catalytic oxidation effect.
In addition, as shown in fig. 2, the present invention further provides an exhaust gas treatment method, which comprises the following steps:
providing an exhaust gas treatment system according to any of the above aspects, wherein the connection relationship and the function and the purpose of the exhaust gas treatment system are described in the above description, and are not described herein again;
starting relevant devices in the waste gas treatment system, adding at least the catalyst into the reaction chamber 103a of the catalytic oxidation reaction device 103, introducing the gas source, wherein the gas source can be at least one of air, oxygen and ozone to form the micro-nano bubble catalytic oxidation system, the waste gas to be treated is introduced into the reaction chamber 103a, and the waste gas to be treated is treated based on the micro-nano bubble catalytic oxidation system, and the start of the relevant devices of the system and the adding sequence of various raw materials required for forming the micro-nano bubble catalytic oxidation system are selected according to the actual requirements, after the waste gas to be treated is degraded, the purified gas is discharged from the purified gas outlet 103c, and the remaining water mist flows back to the micro-nano bubble generating device 100 for recycling.
As an example, the pressure for pressurizing the primary micro-nano bubbles based on the pressurization processing device 102 is between 0.1Mpa and 1.5Mpa, preferably 0.5Mpa and 1.2Mpa, such as 0.25Mpa, 0.3Mpa and 1.0Mpa, so that the primary micro-nano bubbles are transformed into micro-nano bubbles with self-based forming capability.
As an example, the temperature of the liquid in the reaction chamber 103a is controlled to be between 25 ℃ and 70 ℃, preferably between 35 ℃ and 60 ℃, so that the exhaust gas treatment effect can be further improved. For example, the heating device and the temperature monitoring device may be provided in the exhaust gas treatment system, the liquid in the reaction chamber 103a is heated by the heating device, and the temperature monitoring device is used for monitoring to control the heating device.
As an example, the micro-nano bubble generation device 100 further comprises a step of controlling a ratio of the gas source to the liquid source, wherein the ratio of the gas source to the liquid source is controlled to be between 1:1 and 1:20, preferably between 1:10 and 1: 15.
Illustratively, the process for forming the micro-nano bubble catalytic oxidation system further comprises a step of adding an oxidant, wherein the regenerated micro-nano bubbles, the catalyst and the oxidant form the micro-nano bubble catalytic oxidation system, the concentration of the oxidant is between 0.1% and 5%, the reaction rate can be correspondingly increased, preferably between 0.5% and 1%, and the oxidant comprises at least one of hydrogen peroxide, ferric chloride, ferric sulfate, sodium ferrite, potassium ferrite, peroxyacetic acid, sodium dichromate, potassium dichromate, chromic acid, nitric acid, potassium permanganate, sodium persulfate, potassium persulfate, ammonium persulfate, sodium ferrate, potassium ferrate, sodium hypochlorite, sodium percarbonate, sodium perborate and potassium perborate.
In addition, the catalyst includes at least one of a non-noble metal catalyst and a noble metal catalyst, wherein the non-noble metal catalyst includes at least one of ferric chloride, ferric sulfate, ferrous chloride, ferrous sulfate, cupric chloride, and cupric sulfate, and the noble metal catalyst includes at least one of gold, platinum, and palladium. The catalyst can realize a catalytic function in a homogeneous catalysis mode or a heterogeneous catalysis mode, and in one example, the concentration range of the catalyst is between 5mg/L and 5g/L, for example, 1g/L or 3g/L is selected, so that the treatment of the generated micro-nano bubble catalytic oxidation system on VOCs is further facilitated.
By way of example, the waste gas to be treated comprises VOCs, the VOCs comprise at least one of water-soluble aldehyde VOCs, water-soluble ketone VOCs, water-insoluble benzene VOCs and water-insoluble toluene VOCs, and the VOCs are oxidized by the micro-nano bubble catalytic oxidation system to generate CO2、H2O and other intermediate degradation products.
The effects of the present invention will be described below with reference to specific examples.
Example 1:
a system for treating VOCs (volatile organic compounds) by catalytic oxidation of micro-nano bubbles comprises a micro-nano bubble generation device, a pressure tank, a reaction circulation unit, a VOCs gas distribution nozzle and a gas-water separator. Introducing air into the micro-nano bubble generating device to form micro-nano bubble water, wherein the flow of a micro-nano gas-liquid mixing pump is 1m3And/h, the liquid-gas ratio is 9:1, the micro-nano bubble water enters the reaction unit after being pressurized by the pressure tank, the pressure of the pressure tank is maintained at 0.4MPa, and 0.5% of ferric chloride is added into the reactor to form the micro-nano bubble aqueous solution with strong oxidizing property. VOCs gas passes through the gas distribution nozzle and is mixed with strong oxidizing micro-nano bubbles in the reactorAfter contacting with the aqueous solution, CO is generated by oxidation2、H2O and other degradation products, and the purified waste gas flows upwards and is discharged after passing through a gas-water separator.
The concentration of benzoyl chloride in the mixed gas of the inlet VOCs is 213ppm, the concentration of xylene is 105ppm and the concentration of styrene is 184 ppm. Treating the mixed VOCs, and measuring the concentration of benzoyl chloride at an outlet of the exhaust gas by a gas-water separation device to obtain the removal rate of 95.7%; the concentration of dimethylbenzene is 7ppm, and the removal rate reaches 93.3%; the concentration of styrene is 10ppm, and the removal rate reaches 94.5 percent.
Example 2:
a system for treating VOCs (volatile organic compounds) by catalytic oxidation of micro-nano bubbles comprises a micro-nano bubble generation device, a pressure tank, a reaction circulation unit, a VOCs gas distribution nozzle and a gas-water separator. Air is introduced into the micro-nano bubble generating device to form micro-nano bubble water, the flow of a micro-nano gas-liquid mixing pump is 1m3/h, the liquid-gas ratio is 10:1, the micro-nano bubble water enters the spraying unit after being pressurized by the pressure tank, the pressure of the pressure tank is maintained at 0.3MPa, and hydrogen peroxide is dripped into the reactor according to 150mL/h to form the micro-nano bubble water solution with strong oxidizing property. VOCs gas passes through the gas distribution nozzle, is contacted with the strong-oxidizing micro-nano bubble aqueous solution in the reactor and then is oxidized to generate CO2, H2O and other degradation products, and the purified waste gas flows upwards and is discharged after passing through the gas-water separator.
The concentration of n-butyl acetate, cyclohexanone and methyl methacrylate in the mixed gas of the inlet VOCs is 154ppm, 201ppm and 147ppm respectively. Treating the mixed VOCs, and measuring the concentration of n-butyl acetate in the waste gas at the outlet of the exhaust gas by a gas-water separation device to obtain 11ppm, wherein the removal rate reaches 92.8%; the concentration of cyclohexanone is 12ppm, and the removal rate reaches 94.0 percent; the concentration of methyl methacrylate is 9ppm, and the removal rate reaches 93.8 percent.
Example 3:
a system for treating VOCs (volatile organic compounds) by oxidizing and degrading micro-nano bubbles comprises a micro-nano bubble pump, a pressure tank, an ozone generator, a reaction circulation unit, a VOCs gas distribution nozzle and a gas-water separator. Introducing ozone gas into the micro-nano bubble generating device to form micro-nano bubble water, wherein the flow of a micro-nano gas-liquid mixing pump is 1m3/h, the liquid-gas ratio is 10:1, the concentration of ozone in inlet air is 20-180mg/L, the micro-nano bubble water enters a spraying unit after being pressurized by a pressure tank, the pressure of the pressure tank is maintained at 0.3MPa, and 1.0% of potassium ferrate is added into a reactor to form the micro-nano bubble solution with strong oxidizing property. VOCs gas passes through the gas distribution nozzle, is contacted with the strong-oxidizing micro-nano bubble aqueous solution in the reactor and then is oxidized to generate CO2, H2O and other degradation products, and the purified waste gas flows upwards and is discharged after passing through the gas-water separator.
The concentration of dimethylaniline, p-xylene and toluene in the mixed gas of the inlet VOCs is 189ppm, 145ppm and 223 ppm. Treating the mixed VOCs, and measuring the concentration of dimethylaniline in the exhaust gas at the outlet of the exhaust gas by passing the exhaust gas at the outlet through a gas-water separation device to obtain the removal rate of 95.2 percent; the concentration of p-xylene is 9ppm, and the removal rate reaches 93.7 percent; the toluene concentration was 11ppm, and the removal rate reached 95.1%.
The utility model does not need to carry out pretreatment measures such as dehumidification and concentration on the VOCs waste gas, in addition, a pressurizing and air dissolving method and a dispersed air method are integrated, the total amount of micro-nano bubbles is increased, the bubble size of the micro-nano bubbles is reduced, the low-energy consumption and high-efficiency micro-nano bubble generation effect is realized, the characteristics of long retention time, high interface zeta potential, self-pressurization dissolution and large quantity of radicals released in the moment of rupture in the micro-nano bubble water are utilized, a micro-nano bubble catalytic oxidation system is built, mass transfer enhancement is realized, a large amount of micro-nano bubble water with super-strong oxidation capacity is prepared, the waste gas removal efficiency is high, the efficient removal of VOCs is realized under a relatively mild condition, the problems that a micro-nano bubble generating device is complex in structure, high in energy consumption, low in bubble generation amount, poor in bubble stability, low in tolerance solid content and the like can be solved, the micro-nano bubble generating device is environment-friendly and non-toxic, and waste gas after degradation treatment can be discharged through simple treatment.
To sum up, the utility model provides an exhaust treatment device, pressurization through pressurization processing apparatus makes micro-nano bubble have the free radical forming ability, combine the micro-nano bubble catalytic oxidation system among the catalytic oxidation device, degrade the desorption to waste gas through the free radical, and wide applicability, can handle water-soluble aldehyde, ketone type VOCs, and water-insoluble benzene, toluene type VOCs etc., need not to treat waste gas (like VOCs waste gas) and dehumidify, pretreatment measures such as concentration, can realize VOCs organic waste gas's high efficiency under milder condition, low-cost catalytic oxidation degradation and desorption, the operating efficiency is higher, the treatment cost is lower, the environmental protection is nontoxic, degradation waste gas can discharge through simple processing. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An exhaust treatment system, comprising:
the micro-nano bubble generating device is used for generating primary micro-nano bubbles;
the gas source supply device is communicated with the micro-nano bubble generation device and is used for providing a gas source required for generating the primary micro-nano bubbles into the micro-nano bubble device;
the pressurization processing device is communicated with the micro-nano bubble generating device, receives the primary micro-nano bubbles and performs pressurization processing on the primary micro-nano bubbles to form regenerated micro-nano bubbles;
the catalytic oxidation reaction device comprises a reaction chamber, a waste gas inlet and a clean gas outlet, wherein the reaction chamber is communicated with the pressurization treatment device to receive the regenerated micro-nano bubbles, a catalyst is added in the reaction chamber to form a micro-nano bubble catalytic oxidation system based on the regenerated micro-nano bubbles and the catalyst, the waste gas inlet is used for inputting waste gas to be treated into the reaction chamber to treat the waste gas to be treated based on the micro-nano bubble catalytic oxidation system, and the clean gas outlet is used for discharging purified gas obtained after the waste gas to be treated is treated by the micro-nano bubble catalytic oxidation system;
the reaction chamber is also communicated with the micro-nano bubble generating device so as to input the liquid in the reaction chamber into the micro-nano bubble generating device to be used as a liquid source required for generating the primary micro-nano bubbles.
2. The exhaust gas treatment system according to claim 1, wherein the micro-nano bubble generating device includes any one of a gas-liquid mixing pump and a porous plate structure.
3. The exhaust gas treatment system of claim 1, wherein the gas source supply device comprises an ozone generator, and the ozone generator is communicated with a pipeline between the micro-nano bubble generation device and the catalytic oxidation reaction device.
4. The exhaust treatment system of claim 1, wherein the pressurized treatment device includes at least one of a pressurized conduit and a pressure tank, and when the pressurized treatment device includes the pressurized conduit and the pressure tank, the pressurized conduit is disposed in series with the pressure tank.
5. The exhaust gas treatment system of claim 1, wherein the pressurization treatment device is in communication with the reaction chamber of the catalytic oxidation reaction device through a spray liquid circulation line, wherein the spray liquid circulation line comprises a spray liquid release nozzle comprising a swirl nozzle.
6. The exhaust treatment system of claim 1, wherein the catalytic oxidation reaction device further comprises an acid-base concentration monitoring device in communication with the reaction chamber.
7. The exhaust gas treatment system according to claim 1, wherein the catalytic oxidation reaction device further includes a gas-liquid separation device that communicates with both the reaction chamber and the clean gas outlet, and the clean gas is discharged from the clean gas outlet via the gas-liquid separation device.
8. The exhaust treatment system of claim 1, wherein the catalytic oxidation reaction device further comprises a heating device to heat treat the reaction chamber.
9. The exhaust treatment system according to any one of claims 1 to 8, wherein the catalytic oxidation reaction device further comprises an oxidant inlet for inputting an oxidant into the reaction chamber, and the regenerated micro-nano bubbles, the catalyst and the oxidant constitute the micro-nano bubble catalytic oxidation system, wherein the oxidant includes any one of hydrogen peroxide, ferric chloride, ferric sulfate, sodium ferrite, potassium ferrite, peroxyacetic acid, sodium dichromate, potassium dichromate, chromic acid, nitric acid, potassium permanganate, sodium persulfate, potassium persulfate, ammonium persulfate, sodium ferrate, potassium ferrate, sodium hypochlorite, sodium percarbonate, sodium perborate, and potassium perborate.
10. The exhaust treatment system of claim 9, wherein the catalyst in the catalytic oxidation reaction device comprises any one of a non-precious metal catalyst and a precious metal catalyst, wherein the non-precious metal catalyst comprises any one of ferric chloride, ferric sulfate, ferrous chloride, ferrous sulfate, cupric chloride, and cupric sulfate, and the precious metal catalyst comprises any one of gold, platinum, and palladium.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112044443A (en) * | 2020-09-16 | 2020-12-08 | 东华大学 | Micro-nano bubble catalyst and preparation method and application thereof |
| CN112827348A (en) * | 2019-11-25 | 2021-05-25 | 中国科学院上海高等研究院 | Exhaust gas treatment system and exhaust gas treatment method |
| CN112844006A (en) * | 2020-12-28 | 2021-05-28 | 马边长和电力有限责任公司 | Yellow phosphorus tail gas purification method |
| WO2023117754A1 (en) | 2021-12-23 | 2023-06-29 | Röhm Gmbh | Process for producing alkyl methacrylates with higher yields and reduced emissions of volatile organic compounds |
| CN112827348B (en) * | 2019-11-25 | 2024-07-16 | 中国科学院上海高等研究院 | Exhaust gas treatment system and exhaust gas treatment method |
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2019
- 2019-11-25 CN CN201922048654.2U patent/CN211216181U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112827348A (en) * | 2019-11-25 | 2021-05-25 | 中国科学院上海高等研究院 | Exhaust gas treatment system and exhaust gas treatment method |
| CN112827348B (en) * | 2019-11-25 | 2024-07-16 | 中国科学院上海高等研究院 | Exhaust gas treatment system and exhaust gas treatment method |
| CN112044443A (en) * | 2020-09-16 | 2020-12-08 | 东华大学 | Micro-nano bubble catalyst and preparation method and application thereof |
| CN112844006A (en) * | 2020-12-28 | 2021-05-28 | 马边长和电力有限责任公司 | Yellow phosphorus tail gas purification method |
| WO2023117754A1 (en) | 2021-12-23 | 2023-06-29 | Röhm Gmbh | Process for producing alkyl methacrylates with higher yields and reduced emissions of volatile organic compounds |
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