CN216987080U

CN216987080U - High-efficient low temperature plasma catalytic oxidation organic waste gas treatment facility

Info

Publication number: CN216987080U
Application number: CN202123308660.0U
Authority: CN
Inventors: 薛云龙; 李其倩; 薛云珠; 贵传震; 薛廷中
Original assignee: Henan Zhongshun Filtration Research Institute Co ltd
Current assignee: Henan Zhongshun Filtration Research Institute Co ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-07-19
Anticipated expiration: 2031-12-27

Abstract

A high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment device comprises a shell with a columnar reaction cavity, wherein a discharge port communicated with the reaction cavity is arranged at the upper part of the shell, an air inlet is arranged at the lower part of the shell, a gas distributor is arranged at the bottom of the reaction cavity, the inner end of the air inlet is communicated with the gas distributor, and the outer end of the air inlet is communicated with an air supplementing channel and a waste gas channel; the catalytic oxidation units are sequentially arranged at the positions above the gas distributor in the reaction cavity from bottom to top, and a water cooling system is arranged between every two adjacent catalytic oxidation units. The waste gas is catalytically oxidized by the catalytic oxidation units, the waste gas treatment amount is large, the waste gas can be randomly designed within the range of 20-20000m cultivation/h, and the waste gas is sufficiently and efficiently treated; the discharge formed by the low-temperature plasma and the catalytic process of the catalytic element have synergistic effect, and the heat generated by catalytic oxidation and ionization discharge can be fully utilized to improve the catalytic effect.

Description

High-efficient low temperature plasma catalytic oxidation organic waste gas treatment facility

Technical Field

The utility model relates to the field of wastewater and waste gas treatment, in particular to high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment equipment.

Background

Volatile Organic Compounds (VOCs) are an important source of atmospheric pollutants. A large amount of VOCs are discharged into the atmosphere and undergo complex physical and chemical reactions with NOx, SOx, O3 and the like, so that haze is generated, and serious harm is brought to human health.

The low temperature plasma is the fourth state of matter following the solid, liquid, gaseous state, and when the applied voltage reaches the ignition voltage of the gas, the gas is broken down, creating a mixture of electrons, various ions, atoms, and radicals. Although the electron temperature is high in the discharge process, the heavy particle temperature is low, and the whole system is in a low-temperature state, so that the system is called low-temperature plasma. The low-temperature plasma catalytic oxidation internally generates particles rich in extremely high chemical activity, such as high-energy electrons, ions, free radicals, excited-state molecules and the like. The pollutant in the waste gas reacts with the active groups with higher energy and is finally converted into substances such as CO2, H20 and the like, thereby achieving the aim of purifying the waste gas.

However, the existing low-temperature plasma catalytic oxidation organic waste gas treatment process and equipment have low efficiency and cannot meet the requirements of the current market.

SUMMERY OF THE UTILITY MODEL

Aiming at the requirements in the prior art, the utility model provides a high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment device.

A high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment device comprises a shell with a columnar reaction cavity, wherein a discharge port communicated with the reaction cavity is formed in the upper part of the shell, an air inlet is formed in the lower part of the shell, a gas distributor is arranged at the bottom of the reaction cavity, the inner end of the air inlet is communicated with the gas distributor, and the outer end of the air inlet is communicated with an air supplementing channel and a waste gas channel; the device comprises a reaction cavity, a plurality of stages of catalytic oxidation units, a water cooling system, a temperature sensor, a catalytic oxidation unit, a high-efficiency plasma generator, a medium barrier discharge structure, a plurality of stages of catalytic oxidation units, a plurality of water cooling systems and a plurality of gas distribution units, wherein the catalytic oxidation units are sequentially arranged in the reaction cavity from bottom to top, the water cooling systems are arranged between every two adjacent catalytic oxidation units, each catalytic oxidation unit comprises an electrode element, a temperature sensor and a catalytic oxidation element which are sequentially arranged from bottom to top, the electrode elements are the high-efficiency plasma generator, electrodes in the high-efficiency plasma generator are arranged in parallel and are of the medium barrier discharge structure, a gap between the electrodes in the high-efficiency plasma generator is 2mm-5mm, and the gap is vertically arranged; the catalytic oxidation element comprises a three-dimensional containing cavity formed by a stainless steel sintering net and a catalyst filled with active carbon or alumina as a carrier in the three-dimensional containing cavity.

Further comprises the following steps: the water cooling system comprises a plate heat exchanger or a tube heat exchanger, and the plate heat exchanger or the tube heat exchanger is arranged in the cross section of the reaction cavity.

Further: the vertical section of the three-dimensional containing cavity is of a U-shaped structure, the inner side wall of the three-dimensional containing cavity forms an air outlet at the opening of the U-shaped structure, the catalytic oxidation element is detachably and fixedly connected below the distribution plate, the air outlet is communicated with through holes uniformly distributed on the distribution plate, and the distribution plate is horizontally arranged and is fixedly and hermetically connected with the inner wall of the reaction cavity along the edge. The catalyst is manufactured in a three-dimensional structure, so that the regeneration is convenient, the flow resistance can be reduced, and the catalytic oxidation effect is improved.

Further: the electrode group of the electrode element is inserted in the reaction cavity.

Further: and the bottom of the shell is provided with a liquid discharge channel communicated with the bottom of the reaction cavity and used for periodically discharging waste liquid brought into the reaction cavity by waste gas.

The utility model has the beneficial effects that: through the high-efficiency plasma generator dielectric barrier discharge, the electrodes are arranged in a parallel structure, no spark is generated, mixed gas passes through an electrode gap of 2-5mm, energy is saved, the efficiency is high, waste gas cannot contact with the electrodes, and the problem of corrosion cannot occur. The waste gas is catalytically oxidized by the plurality of catalytic oxidation units, the waste gas treatment amount is large, the waste gas treatment can be randomly designed within the range of 20-20000m for rapid harvest/h, and the waste gas treatment is sufficient and efficient; the discharge formed by the low-temperature plasma and the catalytic process of the catalytic element have a synergistic effect, so that the heat generated by catalytic oxidation and ionization discharge can be fully utilized to improve the catalytic effect, and the temperature of the system is controlled by a water cooling system, so that the safety of equipment is guaranteed. Air is supplemented into the waste gas inlet, so that sufficient oxygen is ensured to participate in oxidation, and the phenomena of smoke generation and carbonization caused by incomplete reaction are avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of the structure of the area A in FIG. 1;

FIG. 3 is an enlarged view of the area B in FIG. 1;

fig. 4 is an enlarged view of the structure of the region C in fig. 1.

In the figure, 1, a housing; 11. an outlet port; 12. an air inlet; 121. an exhaust gas passage; 122. a gas supply channel; 123. a blower; 124. a flow meter; 2. a gas distributor; 21. a liquid discharge channel; 3. a catalytic oxidation unit; 31. an electrode element; 32. a temperature sensor; 33. a catalytic oxidation element; 331. sintering the stainless steel mesh; 332. a catalyst; 333. a distribution plate; 4. and a water cooling system.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the utility model. The terms of orientation such as left, center, right, up, down, etc. in the examples of the present invention are only relative concepts to each other or are referred to the normal use state of the product, and should not be considered as limiting.

An efficient low-temperature plasma catalytic oxidation organic waste gas treatment device is shown in fig. 1, and comprises a shell 1 with a columnar reaction cavity, wherein a discharge port 11 communicated with the reaction cavity is arranged at the upper part of the shell 1, an air inlet 12 is arranged at the lower part of the shell 1, a gas distributor 2 is arranged at the bottom of the reaction cavity, the inner end of the air inlet 12 is communicated with the gas distributor 2, the outer end of the air inlet 12 is communicated with an air supplementing channel 122 and a waste gas channel 121, a flow meter 124 is arranged on the waste gas channel 121, a blower 123 is arranged at the port at the outer end of the air supplementing channel 122, and according to waste gases with different flow rates measured by the flow meter 124, the blower 123 is controlled to supplement different amounts of control, so that enough oxygen is ensured to participate in the oxidation of the waste gases; the catalytic oxidation units 3 are sequentially arranged at positions, located above the gas distributor 2, in the reaction cavity from bottom to top, a water cooling system 4 is arranged between every two adjacent catalytic oxidation units 2, each catalytic oxidation unit 3 comprises an electrode element 31, a temperature sensor 32 and a catalytic oxidation element 33 which are sequentially arranged from bottom to top, each electrode element 31 is a high-efficiency plasma generator, electrodes in the high-efficiency plasma generators are arranged in parallel and are of a dielectric barrier discharge structure, gaps between the electrodes in the high-efficiency plasma generators are 2mm-5mm, and the gaps are vertically arranged; the catalytic oxidation element 33 comprises a three-dimensional accommodating cavity formed by a stainless steel sintering net 331 and a catalyst 332 filled with activated carbon or alumina as a carrier in the three-dimensional accommodating cavity.

Wherein the water cooling system 4 comprises a plate heat exchanger or a tube heat exchanger, and the plate heat exchanger or the tube heat exchanger is arranged in the cross section of the reaction chamber. The vertical section of three-dimensional holding chamber is the U-shaped structure, three-dimensional holding intracavity side wall forms the gas outlet at the opening part of U-shaped structure, catalytic oxidation component 33 can dismantle fixed connection in the below of distributing plate 333, the gas outlet with evenly distributed's through-hole is linked together on the distributing plate 333, distributing plate 333 level set up and its border with the inner wall of reaction chamber is fixed and sealing connection. The electrode group of the electrode element 31 is inserted into the reaction chamber, and the bottom of the shell 1 is provided with a liquid discharge channel 21 communicated with the bottom of the reaction chamber for periodically discharging waste liquid brought into the reaction chamber by waste gas.

In addition, the control system can control the start and stop of each stage of catalytic oxidation unit according to the waste gas flow detected by the flowmeter, so that the energy is saved and the consumption is reduced while the treatment effect is ensured, and the control device can be controlled through field control or remote monitoring. The control system sets automatic control, remote control, central control and field control according to the process program, and the equipment does not need special person to watch.

A high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment method is disclosed, as shown in fig. 1, fig. 2 and fig. 3, waste gas passes through a gas distributor 2 and then is discharged after sequentially passing through a plurality of oxidation catalytic units 3, wherein each catalytic oxidation unit 3 comprises an electrode element 31, a catalytic oxidation element 33 and a temperature sensor 32 positioned between the electrode element 31 and the catalytic oxidation element 33, a water cooling system 4 is arranged between two adjacent catalytic oxidation units 3, and the treatment steps when the waste gas passes through each stage of catalytic oxidation unit 3 and the water cooling system 4 are as follows:

step 1: the electrode element 31 performs excitation, bond breaking reaction and oxidation reaction on the pollution molecules in the waste gas through the generated plasma to obtain primary reaction gas;

step 2: enriching the primary reaction gas and the heat generated by the reaction, keeping the temperature at 100-120 ℃, and directly contacting with a catalytic oxidation element 33 for further catalytic oxidation to obtain secondary reaction gas which generates temperature rise again and is subjected to catalytic oxidation;

and step 3: cooling the secondary reaction gas by a water cooling system 4, and keeping the temperature of the cooled secondary reaction gas within the range of 100-120 ℃ to obtain a treatment gas;

and 4, step 4: the treatment gas is directly passed into the next catalytic oxidation unit 3 or discharged.

The chemical reaction process in which the waste gas and the air participate is as follows:

the first process comprises the following steps: direct bombardment of high-energy electrons, excited molecules and chain scission;

and a second process: o2+ e- -2O- -by oxidation with O atoms or ozone;

the third process: oxidation of OH free radicals H2O + e- -OH + H H2O + O- -2OH H + O2- -OH + O;

the process four is as follows: molecular fragmentation and oxidation reaction;

and a fifth process: catalytic oxidation to generate CO2 and H2O;

when the concentration of the pollutant molecules in the waste gas reaches a certain threshold value, the pollutant molecules are mixed with air in the waste gas and then are introduced into the distributor, and when the waste gas is mixed with the air, the mixture ratio is carried out according to the content of the substances in the components of the waste gas and the oxygen content in the air, so that enough oxygen ions participate in the chemical reaction when the chemical bonds of all the substances in the waste gas are opened. The electrode element adopts a high-efficiency plasma generator, the high-efficiency plasma generator discharges electricity in a dielectric barrier mode with high frequency of 40KHz and high voltage of 15KV, electrodes in the high-efficiency plasma generator are arranged in parallel, and a gap between the two electrodes is 2-5mm, so that energy is saved, and efficiency is high. The high-efficiency plasma technology mainly depends on high-energy electron bombardment, oxygen atom and hydroxyl oxidation to remove pollutant molecules, the reaction of the process is extremely fast, the starting and the stopping are very fast, the process can be started along with the use, and a large amount of time and energy can be saved.

The catalytic oxidation element comprises a three-dimensional containing cavity formed by a stainless steel sintering net and a catalyst which is filled with activated carbon or alumina as a carrier in the three-dimensional containing cavity, so that the reacted mixed gas enters the three-dimensional containing cavity from the side wall of the stainless steel sintering net on one side of the three-dimensional containing cavity, and then the side wall of the stainless steel sintering net on the other side of the three-dimensional containing cavity is discharged out of the containing cavity. The high-efficiency active carbon and metal oxide are used as active catalytic materials, and a three-dimensional framework technology is adopted, so that the number and the distribution uniformity of micropores are improved under the high-temperature condition, higher specific surface area and active surface are obtained, and the catalyst has a special chemical structure and a crystal structure and can be subjected to electronic coupling with an oxidant at normal temperature and normal pressure, so that stable hydroxyl free radicals (-OH) or peroxide free radicals (-OOR) are generated. The free radicals have very strong oxidation performance and can react with organic matters under the condition of plasma, organic free radicals generated in the reaction can continuously participate in-OH chain reaction, or organic peroxide free radicals are generated and then further undergo oxidative decomposition reaction until the organic matters are degraded into final products of CO2 and H2O, so that the aim of oxidative decomposition of the organic matters is fulfilled.

The foregoing shows and describes the general principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, and such changes and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a high-efficient low temperature plasma catalytic oxidation organic waste gas treatment facility which characterized in that: the device comprises a shell with a columnar reaction cavity, wherein a discharge port communicated with the reaction cavity is arranged at the upper part of the shell, an air inlet is arranged at the lower part of the shell, an air distributor is arranged at the bottom of the reaction cavity, the inner end of the air inlet is communicated with the air distributor, and the outer end of the air inlet is communicated with an air supplementing channel and a waste gas channel; the reaction cavity is internally provided with a plurality of catalytic oxidation units which are sequentially arranged from bottom to top at the position above the gas distributor, a water cooling system is arranged between two adjacent catalytic oxidation units, each catalytic oxidation unit comprises an electrode element, a temperature sensor and a catalytic oxidation element which are sequentially arranged from bottom to top, the electrode elements are efficient plasma generators, the electrodes in the efficient plasma generators are arranged in parallel and are of dielectric barrier discharge structures, gaps between the electrodes in the efficient plasma generators are 2mm-5mm, and the gaps are vertically arranged.

2. The high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment equipment according to claim 1, characterized in that: the catalytic oxidation element comprises a three-dimensional containing cavity formed by a stainless steel sintering net and a catalyst filled in the three-dimensional containing cavity and taking active carbon or alumina as a carrier.

3. The high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment equipment according to claim 1, characterized in that: the water cooling system comprises a plate heat exchanger or a tube heat exchanger, and the plate heat exchanger or the tube heat exchanger is arranged in the cross section of the reaction cavity.

4. The high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment equipment according to claim 2, characterized in that: the vertical section of the three-dimensional containing cavity is of a U-shaped structure, the inner side wall of the three-dimensional containing cavity forms an air outlet at the opening of the U-shaped structure, the catalytic oxidation element is detachably and fixedly connected below the distribution plate, the air outlet is communicated with through holes uniformly distributed on the distribution plate, and the distribution plate is horizontally arranged and is fixedly and hermetically connected with the inner wall of the reaction cavity along the edge.

5. The high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment equipment according to claim 1, characterized in that: the electrode group of the electrode element is inserted in the reaction cavity.

6. The high-efficiency low-temperature plasma catalytic oxidation organic waste gas treatment equipment according to claim 1, characterized in that: and the bottom of the shell is provided with a liquid discharge channel communicated with the bottom of the reaction cavity and used for periodically discharging waste liquid brought into the reaction cavity by waste gas.