CN221207506U - Catalytic oxidation device for organic waste gas - Google Patents

Abstract

The utility model provides an organic waste gas catalytic oxidation device, and relates to the field of organic waste gas purifying equipment. The organic waste gas catalytic oxidation device comprises an air inlet pipe, an air outlet pipe, a catalytic oxidation reaction box body, an air homogenizing component, a catalytic component, an air homogenizing component moving component, a box body bracket and a PLC control system. The wind-homogenizing component comprises a conical wind-homogenizing device and a grid-type wind-homogenizing plate, wherein a spoiler is arranged in the middle of the conical wind-homogenizing device, three layers of limiting grooves are formed in the box body, when the PLC system controls the electric telescopic rod to retract and fix the handle, the wind-homogenizing component can push the push rod according to real-time working conditions, the PLC control system controls the telescopic rod to push the push rod, when the push rod moves to two ends of the grooves, the wind-homogenizing component is clamped, the wind-homogenizing component is fixed, the effect of blocking and shunting the air flow with higher flow speed in the middle of the air inlet pipe is achieved, so that the wind-homogenizing device is convenient to install and high in practicability.

Description

Catalytic oxidation device for organic waste gas

Technical Field

The utility model relates to an exhaust gas purification technology, in particular to catalytic combustion organic exhaust gas purification equipment, and belongs to the technical field of exhaust gas purification equipment.

Background

The organic waste gas refers to waste gas containing gaseous organic matters generated during production, processing, transportation and the like. These exhaust gases are typically from petrochemical, chemical, printing and dyeing, pharmaceutical, painting, and the like industries. Since these exhaust gases contain a large amount of harmful substances such as phenol, formaldehyde, etc., which cause great harm to human health and environment, such as harmful substances in organic exhaust gases can cause respiratory diseases such as bronchitis, asthma, etc.; harmful substances in the organic waste gas can also influence the nervous system, so that symptoms such as headache, dizziness and the like are caused; harmful substances in the organic waste gas can also influence the immune system, so that the immunity is reduced and diseases are easy to infect; harmful substances in the organic waste gas can cause atmospheric pollution, so that the environmental problems such as acid rain and the like are caused; thus, effective abatement is required.

The treatment technology of organic waste gas is divided into several major categories, namely ① thermal destruction method: the thermal destruction method is a treatment method for directly and auxiliarily combusting organic gas or accelerating the chemical decomposition reaction of VOC by using a proper catalyst so as to finally reduce the concentration and the hazard of the organic matters. The thermal destruction method has better treatment effect on organic waste gas with lower concentration, and is mainly divided into two types, namely direct flame combustion and catalytic combustion. The heat treatment efficiency of the direct flame combustion on the organic waste gas is relatively high and can reach 99% in general. And catalytic combustion refers to accelerating the chemical reaction speed of the organic waste gas under the action of the catalytic bed layer. ② Low temperature plasma technology: the low-temperature plasma mainly utilizes discharge to generate particles with high reactivity to react with non-methane total hydrocarbon, so that the non-methane total hydrocarbon is decomposed into small molecular compounds, and VOC waste gas is removed. The plasma occupation area is small, the removal efficiency is high, the removal efficiency of aromatic hydrocarbon is high in particular, and the VOC gas with low concentration is generally treated. ③ Activated carbon adsorption: activated carbon adsorption is one of the most commonly used treatments of organic waste gases. The activated carbon is put into an activated carbon box, and the flue gas is adsorbed when passing through the activated carbon. The activated carbon is safe to adsorb and has good treatment effect on low-concentration VOC waste gas. However, in the case of high concentrations of VOCs, insufficient absorption can result in the minimum emission standard not being met. The activated carbon is replaced frequently, and the activated carbon needs to be replaced once in 2 weeks basically, so that the activated carbon is very tedious and the cost for treating the activated carbon after adsorption is high. ④ Biological treatment method: in terms of the basic principle of treatment, the biological treatment method is adopted to treat the organic waste gas, and the physiological process of microorganisms is used for converting harmful substances in the organic waste gas into simple inorganic matters, such as CO ₂、H₂ O, other simple inorganic matters and the like. ⑤ Absorption method: the absorption method refers to the method that harmful molecules in the organic waste gas are transferred into the absorbent through the contact of the absorbent and the organic waste gas, so as to realize the purpose of separating the organic waste gas. This treatment is a typical physicochemical process. After the organic waste gas is transferred into the absorbent, the harmful molecules in the absorbent are removed by adopting an analysis method, and then the harmful molecules are recovered, so that the absorbent can be reused and utilized. ⑥ Condensing and recycling method: at different temperatures, the saturation of the organic matters is different, the condensation recovery method takes advantage of the characteristic of the organic matters, and the organic matters in the steam environment are extracted in a condensation mode by reducing or increasing the pressure of the system. After condensation and extraction, the organic waste gas can be purified relatively high. The method has the defects that the operation difficulty is relatively high, the method is not easy to be completed by cooling water at normal temperature, and the condensate water needs to be cooled, so that more cost is required. The treatment method is mainly suitable for treating the organic waste gas with high concentration and relatively low temperature.

At present, the catalytic oxidation technology is an environment-friendly technology widely used for treating organic waste gas emission, and large catalytic combustion equipment comprises RTO and RCO, so that most industries adopt CO catalytic combustion equipment for treatment at present. The technical principle is that a catalyst is used for promoting the oxidation reaction of the organic waste gas at a proper temperature, and the organic waste gas is decomposed into harmless carbon dioxide and water, so that the catalytic combustion method is an environment-friendly purifying treatment method capable of carrying out harmless treatment on the organic waste gas. The light-off temperature and reaction temperature required for catalytic oxidation are lower, unlike general thermal combustion, and are typically flameless reactions at the catalyst surface.

Although the purification efficiency of catalytic oxidation technology often depends on the performance of the catalyst, the occurrence of uneven air uniformity in the catalytic oxidation equipment may affect the efficiency and performance of the reaction, as well as the life of the catalyst. For example, uneven temperature distribution can lead to local temperatures in the reaction that are too high or too low, thereby affecting the reaction rate and selectivity, and uneven flow distribution can lead to excessive loading of partial areas on the catalyst, thereby accelerating deactivation of the catalyst, being fragile, and further leading to safety problems and energy consumption cost problems.

The existing catalytic oxidation equipment can be provided with an air inlet pipe with an expansion port and directly introduce air due to the consideration of the floor occupation, so that the separation phenomenon of the air from the air inlet to the expansion port section can be caused, the air inlet speed of the middle part is too high, the impact on the middle catalyst is large, uniform air inlet cannot be realized, the catalyst deactivation is accelerated, the purification efficiency is low, and the cost for replacing the catalyst is increased.

Disclosure of utility model

The utility model aims to solve the technical problems that the gas at the gas inlet pipe of the existing catalytic oxidation device is unevenly introduced and has larger impact on the catalyst, so that the catalyst is deactivated and fragile, the purification efficiency is low, and the cost for replacing the catalyst is increased, thereby providing the catalytic oxidation device for the organic waste gas.

The technical scheme of the utility model is as follows:

An organic waste gas catalytic oxidation device comprises an air inlet pipe, an air outlet pipe, a catalytic oxidation reaction box body, an air homogenizing component, a catalytic component, an air homogenizing component moving component and a PLC control system. The catalytic oxidation reaction box body is provided with an air equalizing component and a catalytic assembly.

The wind-homogenizing component comprises a conical wind-homogenizing device and a grid-type wind-homogenizing plate, wherein the conical wind-homogenizing device comprises an arc structure, four layers of air inlet hole areas and turbulent flow strips, an air inlet hole is formed in the middle of the arc structure, the air inlet hole areas are located on the four walls of the conical wind-homogenizing device, four layers of air inlet hole areas are formed, the quantity distribution of the air inlet holes of each layer is inconsistent, the quantity is sequentially increased from the air inlet direction, the air inlet direction is parallel to the air flow direction, the aperture close to the air inlet pipe is smaller than the aperture of the air inlet pipe, namely the aperture of the air inlet hole in the first hole area A is smaller than the aperture of the air inlet hole in the second hole area B, and the aperture of the air inlet hole in the third hole area C is smaller than the aperture of the air inlet hole in the fourth hole area D. The turbulence strips are positioned in the middle of the four layers of air inlet hole areas and are fixed with the outer wall of the conical air homogenizing device. The grid type air equalizing plate is fixed with the conical air equalizing device, the area of the grid around the grid type air equalizing plate is larger than that of the middle part, and the holes of the grid in the middle are uniformly distributed.

Preferably, the uniform-air part moving assembly comprises a limiting groove, wherein the limiting groove is formed in the lower portion of the catalytic oxidation reaction box, and the limiting grooves are formed in four sides of the catalytic oxidation reaction box.

Preferably, four sides of the wind-homogenizing component are fixedly connected with four connecting handles, and the connecting handles comprise pushing blocks, electric telescopic rods and fixing handles, wherein the wind-homogenizing component, the fixing handles, springs and the pushing blocks are sequentially connected.

Preferably, a hole is formed in the middle of the fixing handle for fixing the electric telescopic rod and the pushing block.

Preferably, the catalytic assembly comprises a frame, a catalyst and an electric heating tube, wherein the frame is used for fixing the catalyst and the electric heating tube, and the catalyst can be a monolithic catalyst or an integrally-packed granular catalyst.

Preferably, the PLC control system is used for controlling the opening and closing of the valve and controlling the electric telescopic rod to be used for fixing the air equalizing component and the box body when the air equalizing component is moved during overhauling.

The utility model has the beneficial effects that: according to the utility model, the air equalizing component moving assembly and the catalytic assembly are simultaneously arranged in the organic waste gas catalytic oxidation device, the three-layer limiting groove is formed in the box body through the air equalizing component moving assembly, when the PLC system controls the electric telescopic rod to retract into the fixed handle with the push block, the air equalizing component can adjust the position according to real-time working conditions, then the PLC control system controls the telescopic rod to push the push block, when the push block moves to two ends of the groove, the air equalizing component is clamped, the air equalizing component is fixed at the moment, the installation work is finished at the moment, the installation is convenient, and the practicability is high. According to the utility model, the air entering the catalytic assembly can be effectively and uniformly distributed by arranging the air homogenizing component, and the air flowing at a relatively fast speed in the middle part of the air inlet pipe can be blocked and split due to the arrangement of the conical air homogenizing device, and the turbulence strips in the middle part can be used for realizing disturbance and split of the air flow, so that effective air homogenizing is realized.

Drawings

FIG. 1 is a schematic cross-sectional view of the present utility model;

FIG. 2 is a schematic view of the structure of the wind-homogenizing component of the present utility model;

FIG. 3 is a schematic illustration of an installation of the homothermal component displacement assembly of the present utility model;

Fig. 4 is a schematic view of the catalytic assembly structure of the present utility model.

The individual components in the figure are as follows:

The air inlet pipe 1, the air equalizing component 2, the catalytic assembly 3, the catalytic oxidation reaction box 4, the air outlet pipe 5, the grille 6, the conical air equalizing device 7, the connecting handle 8, the turbulent flow strip 9, the vent hole 10, the limiting groove 11, the fixing handle 12, the electric telescopic rod 13, the pushing block 14, the catalyst grille 15, the electric heater 16 and the fixing frame 17.

Detailed Description

The present utility model will be described in further detail with reference to specific examples, but embodiments of the present utility model are not limited thereto, and may be performed with reference to conventional techniques for process parameters that are not specifically noted.

Example 1

Referring to fig. 1-4, an organic waste gas catalytic oxidation device, including intake pipe 1, equal wind part 2, catalytic assembly 3, catalytic oxidation reaction box 4 and outlet duct 5, equal wind part 2, catalytic assembly 3 all install in catalytic oxidation reaction box 4, catalytic assembly 3 and box 4 fixed connection, equal wind part 2 links to each other through equal wind part removal subassembly, and box 4 inner wall is provided with spacing recess 11, equal wind part includes grid 6 and toper equal wind ware 7, and grid 6 is fixed in toper equal wind ware 7 upper portion, toper equal wind ware 7 includes vortex strip 9 and a plurality of air vent 10, equal wind part four sides have set up connection handle 8, connection handle 8 includes fixed handle 12, electric telescopic handle 13 and ejector pad 14, electric telescopic handle 13 is located fixed handle 12 and links to each other with ejector pad 14, can push away ejector pad 14 to spacing recess 11 both ends, and catalytic assembly includes catalyst grid 15, 16 and fixed frame 17, and the catalyst is placed on chucking catalyst grid 15.

In this embodiment, the ventilation holes 10 on the side surface of the conical air equalizer 7 gradually decrease from top to bottom, so that the side surface of the conical air equalizer 7 is distributed with a first hole site area a, a second hole site area B, a third hole site area C and a fourth hole site area D from top to bottom. And a spoiler 9 is arranged between the second hole site region B and the third hole site region C.

In this embodiment, the organic waste gas is input into the catalytic oxidation reaction box body 4 from the air inlet pipe 1 through the pipeline, and is disturbed and split through the air equalizing component 2, so that the organic waste gas is heated by the electric heater 16 after having a better air equalizing effect, uniformly enters the catalyst to fully perform catalytic oxidation reaction, is decomposed into the exhaust gas meeting the national waste gas emission standard, and flows out from the air outlet pipe 5 to be discharged.

In this embodiment, the inside of box 4 is provided with the equal wind part 2, can block the air current that middle speed is faster that intake pipe 1 got into through the setting of equal wind part 2 and slow down and reposition of redundant personnel, and the air current casting toper reposition of redundant personnel is to the uneven air vent 10 of quantity that sets up on the toper equal wind ware 2, and the aperture of mesh in the hole site district increases gradually, and that is first hole site district A mesh aperture < second hole site district B mesh aperture < third hole site C area mesh aperture < fourth hole site district D mesh aperture, and vortex strip 9 plays a disturbance and reposition of redundant personnel's effect in the middle part, and then makes the middle fast both sides slow air current to a fine equipartition effect, and the gas that reaches catalytic assembly 3 is evenly distributed, the moderate state of velocity of flow through grid 6 again at last.

In this embodiment, the four sides of the inner wall of the box body 4 are provided with limiting grooves 11, 3 gears are provided, an electric telescopic rod 13 on a connecting handle 8 is controlled by a PLC control system to shrink and drive a push block 14 to retract into a fixed handle 12, the electric telescopic rod 13 is controlled to stretch after moving to a proper gear, the push block 14 is pushed into two ends of the limiting grooves 11 to be clamped, a good fixing effect is achieved, a proper gear can be selected according to actual working conditions, for example, a scene with larger air quantity, the air homogenizing component 2 can be moved to the gear on the uppermost layer, a certain self-diffusion space is increased for air flow while resistance is reduced, and the air homogenizing component 2 can be moved to the lowest layer in the scene with smaller air quantity to achieve an air homogenizing effect.

In this embodiment, the catalytic oxidation reaction box 4 is internally provided with a catalyst grid 15 and a fixing frame 17, and the catalyst is fixed in the catalytic combustion reaction box 4 through the fixing frame, so as to ensure the stability and safety of the catalyst fixation.

In this embodiment, the electric heater 16 is in sealing connection with the catalytic combustion reaction box 4, and sealing gaskets are arranged between the air equalizing component 2 and the box 4 to prevent the leakage of organic waste gas in the box and pollute the environment.

In this embodiment, intake pipe 1, samming part 2, box 4, grid 15, fixed frame 17, outlet duct 5 and accessory are stainless steel, and the intensity of product is bigger, and the structure is more stable, and can not receive the higher influence of reaction temperature in the box.

Example 2

In this embodiment, hot air with the temperature required by catalytic combustion is introduced first, the hot air enters the catalytic oxidation reaction box 4 from the air inlet pipe 1, and is subjected to air equalization through the air equalization component 2, after passing through the air holes 10 with uneven numbers and the turbulence strips 9 with turbulence effect arranged on the conical air equalization device 7, the air flow is distributed to a certain extent, and then is subjected to small-amplitude uniform diffusion in the inner space of the conical air equalization device 7, and then is subjected to air equalization again through the grid 6 on the conical air equalization device 7, and at the moment, the hot air subjected to secondary air equalization is diffused into the integral catalyst in the catalytic oxidation reaction box 4 to perform heat exchange, and is output after the heat exchange. The above process continues until the catalyst temperature has risen to the desired catalytic temperature and has stabilized for a period of time before the organic exhaust gas can be introduced.

In this embodiment, because the working condition air quantity is larger, therefore, the air homogenizing component 2 is moved to the gear of the uppermost layer through the PLC control system, the organic waste gas enters from the air inlet pipe 1, the separation phenomenon is gradually generated after a small section of self-diffusion, the air flow is separated from the wall surface of the expansion section, the air flow presents the middle air speed to be faster, then the organic waste gas contacts with the air homogenizing component 2, the conical air homogenizing device 7 is shaped, the organic waste gas with the middle air speed to be faster can be dispersed along the expanded conical air homogenizing device 7 and enter into the air holes 10 with uneven quantity arranged on the wall of the conical air homogenizing device, and because the direction of the air holes 10 is parallel to the air flow inlet direction, the organic waste gas flowing in through the air holes 10 still flows vertically, then the organic waste gas with uniform distribution and moderate flow speed enters into the catalyst for reaction through the grid 6 on the conical air homogenizing device 7 for secondary air homogenizing, and flows out after reaction.

In this embodiment, since heating is not performed, a heat-insulating material with a good heat-insulating effect is arranged outside the device to wrap the device, so that heat of the device is ensured not to be lost, and the temperature of the catalytic combustion reaction is maintained.

In this embodiment, the exhaust gas to be treated can reach the temperature required by the catalytic combustion reaction without turning on the electric heater 16 to heat the exhaust gas.

Example 3

In this embodiment, the catalytic carrier is a cordierite honeycomb carrier, and the material is brittle, so that the catalytic carrier is easy to deactivate and break if being impacted by the airflow for a long time, and the catalytic performance is reduced.

In this embodiment, after organic waste gas gets into from intake pipe 1, blocks down and reposition of redundant personnel to organic waste gas through samming part 2, and the air current casting toper reposition of redundant personnel is to the uneven air vent 10 of quantity that sets up on the toper samming ware 2, and the aperture of mesh increases gradually in the hole site district, and the air current has more spaces to flowing all around, and vortex strip 9 plays a disturbance and the effect of reposition of redundant personnel in the middle part, and then makes the middle fast both sides slow air current to a fine samming effect, carries out the secondary samming through grid 6 at last, realizes that the organic that reaches catalytic assembly 3 is evenly distributed, the moderate state of velocity of flow. At the moment, the stress area of the catalyst is increased, the impact action of airflow is reduced, the service life and the catalytic performance of the catalyst are prolonged, and the treatment efficiency of the organic waste gas treated by the device is improved by 5% compared with that of the organic waste gas treated by the original equipment.

The above embodiments are merely three embodiments of the present utility model, and not limited thereto, and modifications and equivalents of some technical features of the above embodiments may be made by those skilled in the art, which fall within the scope of the present utility model.

Claims (10)

1. The catalytic oxidation device for the organic waste gas is characterized by comprising an air inlet pipe (1), an air homogenizing component (2), a catalytic assembly (3), a catalytic oxidation reaction box body (4), an air outlet pipe (5) and an air homogenizing component moving assembly; the air inlet pipe (1) is sequentially connected with the catalytic oxidation reaction box body (4) and the air outlet pipe (5), an air homogenizing component (2) and a catalytic assembly (3) are arranged inside the catalytic oxidation reaction box body (4), and the air homogenizing component (2) is connected with a limit groove (11) formed in the inner wall of the catalytic oxidation reaction box body (4) through a connecting handle (8); an electric heater (16) and a catalyst grid (15) are respectively arranged above the air equalizing component (2) through a fixed frame (17); the catalyst grille (15) is used for placing and fixing a catalyst, the fixing frame (17) is used for fixing the catalyst grille (15) and the electric heater (16), the electric heater (16) is in sealing connection with the catalytic oxidation reaction box body (4), and a sealing gasket is arranged between the air homogenizing component (2) and the box body (4).

2. The catalytic oxidation device for organic waste gas according to claim 1, wherein:

four connecting handles (8) are fixedly connected to the four sides of the wind equalizing component (2).

3. An organic waste gas catalytic oxidation device according to claim 2, wherein:

The connecting handle comprises a push block, an electric telescopic rod (13) and a fixed handle (12); the middle of the fixing handle is provided with a hole for fixing the electric telescopic rod and the pushing block; the fixed handle (12) is fixedly connected with the wind-homogenizing component (2); two ends of the fixed handle (12) are connected with an electric telescopic rod (13) and a pushing block (14); the wind equalizing component (2) pushes the pushing block (14) to the two ends of the limiting groove (11) through the electric telescopic rod (13) on the connecting handle (8) to be clamped and fixed.

4. The catalytic oxidation device for organic waste gas according to claim 1, wherein: the wind homogenizing component (2) comprises a grid-type wind homogenizing plate (6) and a conical wind homogenizing device (7), and the grid-type wind homogenizing plate (6) is fixedly connected with the conical wind homogenizing device (7).

5. The catalytic oxidation device for organic waste gas according to claim 1, wherein: the catalytic oxidation reaction box (4) inner wall is equipped with spacing recess (11), the equal wind part sets up connecting handle (8), is connected with spacing recess (11) chucking through connecting handle (8), equal wind part (2) carries out three and keeps off spacing removal through moving the subassembly.

6. The catalytic oxidation device for organic waste gas according to claim 4, wherein: the top end of the conical air equalizer (7) is provided with an arc structure; the arc structure is provided with a vent hole (10); the four walls of the conical air homogenizing device (7) are provided with an air inlet hole site area and a turbulent flow strip (9); the air inlet hole position areas are positioned on four walls of the conical air homogenizing device (7), four layers of air inlet hole position areas are arranged, the quantity distribution of each layer of air inlet holes is inconsistent, the quantity is sequentially increased from the air inlet direction, the air inlet direction is parallel to the air flow direction, and the aperture close to the air inlet pipe is smaller than the aperture far away from the air inlet pipe.

7. The catalytic oxidation device for organic waste gas according to claim 6, wherein: the ventilation holes (10) on the side surface of the conical air homogenizing device (7) are gradually reduced from top to bottom, so that a first hole site area A, a second hole site area B, a third hole site area C and a fourth hole site area D are distributed on the side surface of the conical air homogenizing device (7) from top to bottom.

8. The catalytic oxidation device for organic waste gas according to claim 7, wherein: and a turbulence strip (9) is arranged between the second hole site area B and the third hole site area C.

9. The catalytic oxidation device for organic waste gas according to claim 1, wherein: the catalytic assembly (3) comprises a catalyst, which may be a monolithic catalyst or a monolithic packed particulate catalyst.

10. The catalytic oxidation device for organic waste gas according to claim 1, wherein: the device also comprises a PLC control system, wherein the PLC control system is connected with the connecting handle (8) and controls the connecting handle (8) to stretch out and draw back.