A coupled ultrasonic tail gas treatment device system

Abstract

The utility model provides a kind of tail gas treatment device system of coupling ultrasonic wave, the tail gas treatment device system includes reaction tower, absorption liquid collection pool, absorption liquid circulating pool and automation control unit;The reaction tower and absorption liquid collection pool are connected by bottom absorption liquid conveying pipeline;The reaction tower and absorption liquid circulating pool are connected by overflow pipe;The top of the reaction tower is provided with exhaust port, and bottom is provided with ultrasonic absorption unit;Spraying device is provided between the exhaust port and ultrasonic absorption unit;The automation control unit is used to control the operation of the tail gas treatment device system.The utility model greatly improves the absorption rate of harmful components in tail gas in absorption liquid by combining the cavitation effect of ultrasonic wave and the countercurrent contact of conventional reaction tower, and then improves the utilization rate of absorption liquid;Reduce the equipment volume, reduce energy consumption.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology, and in particular relates to a tail gas treatment device system coupled with ultrasonic waves. Background Technology

[0002] Chemical plants generate nitrogen oxide waste gas during the production of various chemical products, such as nitric acid, nitrobenzene, nitrogen fertilizer, and the preparation of various nitrates by reacting nitric acid with metals. Nitrogen oxides mainly include ammonia monoxide and nitrogen dioxide. These waste gases have a great damaging effect on the environment. They are one of the main substances that form acid rain, an important substance that forms photochemical smog in the atmosphere, and an important factor that consumes ozone. Therefore, they must be treated. Reasonable disposal and resource utilization of waste gases can reduce treatment costs to a certain extent.

[0003] Existing methods for treating nitrogen oxide emissions generally include: selective non-catalytic reduction (SCR), selective catalytic reduction (SNCR), adsorption, and absorption. SNCR and SCR methods use ammonia or urea as reducing agents at high temperatures, with or without a catalyst, to reduce nitrogen oxides to nitrogen and water, ultimately resulting in harmless emissions. These methods are generally used in thermal power plants for nitrogen oxide treatment. Adsorption is generally suitable for situations with low nitrogen oxide levels. Absorption uses water, alkali, or acid for absorption and conversion, with alkali solutions being commonly used. It has the advantages of wide applicability and simple equipment, but the absorption product is a mixed solution of nitric acid and nitrite, which is difficult to separate and purify, posing a challenge for those skilled in the art.

[0004] CN 221062266U discloses a tail gas alkaline treatment device, which discloses the use of an alkaline scrubbing tower combined with a circulation system to treat tail gas; CN 207478319U discloses an ultrasonic boiler tail gas desulfurization device, which discloses the use of ultrasound to enhance gas-liquid mixing efficiency and is suitable for boiler tail gas desulfurization; CN 108380018A discloses a nitrogen oxide absorption device and a method for separating absorption products using the device, which discloses the separation and recovery of nitrogen oxides through a multi-stage alkaline absorption tower and a reaction unit, and the process route is complementary to the alkaline scrubbing method.

[0005] While the aforementioned patents disclose exhaust gas treatment devices such as spray towers or packed towers, these devices offer limited improvement in gas-liquid mass transfer efficiency and require optimization of the reaction process using physical enhancement methods. Therefore, it is necessary to provide a novel exhaust gas treatment device to further improve exhaust gas treatment efficiency. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a tail gas treatment device system coupled with ultrasonic waves. This invention, by combining the cavitation effect of ultrasonic waves with a conventional reaction tower, significantly improves the absorption rate of harmful components in the tail gas in the absorbent liquid, increases the utilization rate of the absorbent liquid, reduces equipment size, and decreases energy consumption.

[0007] To achieve this objective, the present invention adopts the following technical solution: This utility model provides a tail gas treatment device system coupled with ultrasonic waves, the tail gas treatment device system including a reaction tower, an absorbent collection tank, an absorbent circulation tank, and an automatic control unit; The reaction tower and the absorbent collection tank are connected by a bottom absorbent delivery pipe; the reaction tower and the absorbent circulation tank are connected by an overflow pipe. The top of the reaction tower is equipped with an exhaust port, and the bottom is equipped with an ultrasonic absorption unit. A spraying device is provided between the exhaust port and the ultrasonic absorption unit. The automated control unit is used to control the operation of the exhaust gas treatment system.

[0008] This invention combines the cavitation effect of ultrasound with a conventional reaction tower, which greatly improves the absorption efficiency of harmful components in exhaust gas and increases the utilization rate of the absorbent liquid. In addition, by integrating the ultrasound and the reaction tower, the equipment size is further reduced and energy consumption is decreased.

[0009] In this invention, the exhaust gas to be treated is introduced through an ultrasonic absorption unit (bottom of the tower), and the absorption liquid and the exhaust gas to be treated are contacted and reacted (countercurrent contact) through a spray device, so as to reduce the content of harmful components in the exhaust gas. Furthermore, the ultrasonic absorption unit induces cavitation in the absorbent liquid. The principle behind this is that when ultrasound propagates in a liquid, it creates alternating high-pressure and low-pressure regions. In the low-pressure region, small bubbles in the liquid expand rapidly, while in the high-pressure region, they contract sharply until they burst. This cavitation effect of ultrasound can break bubbles into numerous micro- and nano-sized bubbles, which can be uniformly dispersed in the absorbent liquid, achieving a surface area 10 to 10,000 times larger than before. This increases the reaction efficiency between harmful components and the absorbent liquid, thereby accelerating the reaction and absorption of exhaust gas and the absorbent liquid.

[0010] As a preferred technical solution of this utility model, the ultrasonic absorption unit includes an aeration device and an ultrasonic device; Preferably, the ultrasonic device is disposed between the aeration device and the exhaust port.

[0011] Preferably, the aeration device is connected to a pressurized blower via a main ventilation pipe.

[0012] Preferably, the pressurizing fan is provided with an air inlet.

[0013] In this invention, the pressurizing blower includes a pressurizing Roots blower. The exhaust gas to be treated is pressurized by the pressurizing blower and then enters the ventilation main pipe, and then enters the aeration device at the bottom of the tower, so that the gas enters the absorption liquid in the form of bubbles. In addition, the exhaust gas to be treated is exhaust gas that has undergone cooling and dust removal treatment.

[0014] As a preferred embodiment of this invention, the aeration device includes an aeration network pipe.

[0015] Preferably, a plurality of aeration heads are evenly distributed on the aeration network pipe.

[0016] As a preferred technical solution of this utility model, the ultrasonic device includes at least 4 ultrasonic transducer plates that are staggered and fixedly arranged on the inner wall of the reaction tower. The number of ultrasonic transducer plates is ≥ 4, for example, it can be 4, 5 or 6, etc., but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0017] Preferably, a plurality of ultrasonic transducers are evenly distributed on the ultrasonic transducer plate.

[0018] It is worth noting that the ultrasonic transducer plate described in this utility model is a commercially available product.

[0019] In this invention, the exhaust gas, pressurized by a blower, passes through several aeration heads, causing the gas introduced into the absorbent liquid to rise in the form of dense and uniformly distributed bubbles to the staggered ultrasonic transducer plates. The cavitation effect of the ultrasonic transducer plates breaks the bubbles into even smaller bubbles (micro-nano scale). Because the bubbles are smaller, their rising speed in the absorbent liquid becomes slower, thereby prolonging the residence time of harmful components in the exhaust gas with the absorbent liquid (increasing from the original 0.5-1 second to 30 seconds or even several minutes). Furthermore, the micro-nano scale bubbles further increase the contact area between the harmful components in the exhaust gas and the absorbent liquid, which can increase or decrease the contact area by 10-10 times. 4 Furthermore, the local high temperature and pressure generated by cavitation further promote the absorption reaction between harmful tissues and the absorbent, thereby increasing the absorption efficiency to over 70-90%.

[0020] As a preferred technical solution of this utility model, in the direction away from the ultrasonic device, the reaction tower is sequentially provided with a packing layer and a demister.

[0021] Preferably, the spraying device is disposed between the packing layer and the demister.

[0022] In this invention, the demister is used to remove mist droplets (mist droplets generated by the absorbent liquid due to ultrasonic action) from the exhaust gas, while the packing layer can increase the contact area and contact time between the exhaust gas and the absorbent liquid, thereby further improving the exhaust gas treatment efficiency.

[0023] Preferably, a conical absorbent guide ring is fixedly provided on the side wall of the packing layer.

[0024] Preferably, an absorbent collection funnel is provided between the conical absorbent guide ring and the ultrasonic device.

[0025] Preferably, the outlet of the absorbent collection funnel penetrates the side wall of the reaction tower and is connected to the absorbent collection tank.

[0026] In this invention, the conical absorbent guide ring guides the absorbent flowing down the wall to the absorbent collection funnel below. The absorbent collected in the funnel is then sent to the absorbent collection pool, thereby achieving the collection of the absorbent after spray absorption.

[0027] As a preferred embodiment of this invention, the spraying device is connected to the spraying pump via a spraying pipe.

[0028] Preferably, the spray pump is installed inside the absorbent circulation tank.

[0029] Preferably, the spraying device has a sprinkler-like shape, which can further expand the spraying area.

[0030] As a preferred technical solution of this utility model, the automated control unit includes a control motherboard, a pH detection device, and an alkali addition module.

[0031] Preferably, the pH detection device is installed on the overflow pipe.

[0032] Preferably, the alkali addition module is installed on top of the absorbent circulation tank.

[0033] Preferably, the control motherboard is connected to the pH detection device, the alkali addition module, the ultrasonic absorption unit, and the spraying device, respectively.

[0034] It is worth noting that this utility model does not limit the specific structure of the control motherboard, pH detection device and alkali addition module, as long as the safe operation of the device can be achieved. More specifically, the pH detection device can realize the real-time detection of the acidity and alkalinity of the absorption liquid, the alkali addition module can realize the replenishment of alkali in the absorption liquid circulation tank, and the control motherboard can realize the control of the switching of the ultrasonic device, spray device and alkali addition module in the device system.

[0035] In this invention, the circulation path of the absorbent liquid includes: when the liquid level at the bottom of the reaction tower rises to the overflow pipe, the absorbent liquid enters the circulation pool, and then the spray pump in the circulation pool is used to transport it to the spray decoration through the spray pipe to spray the packing layer, forming a closed loop of spray head - packing layer - collection funnel - absorbent liquid collection pool - bottom of reaction tower - transducer plate - circulation pool - circulation pump - spray pipe - spray device; The process of controlling the pH value of the absorbent includes: installing a pH detection device on the overflow pipe to detect the pH value of the absorbent entering the circulation tank; taking the treatment of nitrogen oxides in the exhaust gas as an example, when the pH value is <9, the control unit controls the alkali addition module to add alkali, and when the pH value is >13, the alkali addition module stops adding alkali, thus realizing automatic control of the pH value of the absorbent; at the same time, the control unit also provides power control for the ultrasonic transducer plate, power supply and start / stop control for the circulation pump motor and Roots blower; The flow path of the exhaust gas in the exhaust gas treatment system includes: the exhaust gas is pressurized and transported to the aeration device by a pressurizing fan; the exhaust gas enters the reaction tower in the form of small bubbles through the aeration head; the bubbles move upward together with the absorbent liquid entering the collection tank; they move upward through the tortuous path formed by the ultrasonic device and split into small bubbles; the small bubbles rise to the absorbent liquid surface at the bottom of the reaction tower and burst; the gas inside the bursting bubbles comes into countercurrent contact with the sprayed absorbent liquid; the gas after passing through the packing layer rises further to the demister layer, removes the mist droplets in the gas, and is discharged through the discharge port.

[0036] The exhaust gas treatment method using the above-mentioned exhaust gas treatment device system with coupled ultrasonic waves includes the following steps: (1) After the exhaust gas is pressurized by the Roots blower, it is transported to the aeration network pipe through the ventilation main pipe; after the exhaust gas passes through the aeration head, it forms a number of bubbles; after the bubbles are ultrasonically treated by the ultrasonic device, they form a number of small bubbles. (2) When the small bubble in step (1) reaches the surface of the absorbent liquid at the bottom of the reaction tower, it breaks. After the bubble breaks, the gas inside the bubble comes into contact with the absorbent liquid in the opposite direction. After passing through the packing layer, the gas rises further to the demister layer, removes the mist droplets generated by the ultrasonic action of the absorbent liquid, and then discharges through the outlet.

[0037] Preferably, after pressurization in step (1), the exhaust gas pressure is 1.6 to 1.8 atmospheres, approximately 162.12 to 182.38 kPa. For example, it can be 163 kPa, 165 kPa, 170 kPa, 175 kPa, 180 kPa, or 182.38 kPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0038] Preferably, the ultrasonic device includes an ultrasonic transducer plate.

[0039] Preferably, the operating frequency of the ultrasonic transducer plate is 20~40kHz, for example, it can be 20kHz, 24kHz, 28kHz, 32kHz, 36kHz or 40kHz, but is not limited to the listed values. Other values ​​not listed within the range are also applicable.

[0040] Preferably, the power density of the ultrasonic transducer plate is 0.5~2W / cm². 2 For example, it could be 0.5 W / cm 2 0.8W / cm 2 1.1W / cm 2 1.4W / cm 2 1.7W / cm 2 Or 2W / cm 2 This applies to, but is not limited to, the listed values; other unlisted values ​​within the range are also applicable.

[0041] The exhaust gas treatment device system coupled with ultrasonic waves provided by this utility model can be used to treat nitrogen oxides, sulfur oxides or volatile organic compounds (VOcs) in the exhaust gas after dust removal and cooling.

[0042] The numerical range described in this utility model includes not only the point values ​​listed above, but also any point values ​​within the numerical range not listed above. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific point values ​​included in the range.

[0043] The system refers to an equipment system, device system, or production device.

[0044] Compared with the prior art, the present invention has the following beneficial effects: (1) By combining the cavitation effect of ultrasound with a conventional reaction tower, this utility model greatly improves the absorption rate of harmful components in the exhaust gas in the absorbent liquid, increases the utilization rate of the absorbent liquid, reduces the equipment volume, and reduces energy consumption. (2) By setting up a conical guide plate, a collection funnel and a collection pool, this utility model realizes that the absorbent liquid used for spraying enters from the bottom of the reaction tower, ensuring that the gas and liquid entering the tower are in the same direction, and also enabling the gas and liquid to flow along the designed path, improving the working efficiency of the ultrasonic transducer plate, reducing the motor used for alkali liquid guidance, saving equipment investment and maintenance costs, making the equipment structure more compact and reducing the space occupied. (3) This utility model reduces the volume of gas bubbles entering the tower by using an ultrasonic absorption unit, increases the contact area with the absorbent liquid, reduces the speed at which bubbles rise, and also increases the contact time between the gas and the absorbent liquid, thereby maximizing the reaction efficiency between harmful components in the exhaust gas and the absorbent liquid. (4) This utility model further promotes the cavitation effect by rationally designing the distribution structure of the ultrasonic transducer plate, thereby increasing the specific surface area of ​​the bubbles by 10-10%. 4 The residence time is increased to more than 10 times the original, and the local high temperature of cavitation effect accelerates the reaction rate of harmful components in the exhaust gas with the absorbent liquid. (5) This utility model utilizes an automated control unit to achieve automated operation of the entire equipment. Attached Figure Description

[0045] Figure 1 A schematic diagram of the exhaust gas treatment device system with coupled ultrasonic waves provided by this utility model; Figure 2 A top view of the ultrasonic transducer plate provided by this utility model; Figure 3 A top view of the aeration network pipe provided by this utility model; Wherein: 1000 is the reaction tower, 1001 is the exhaust port, 1002 is the demister, 1003 is the packing layer, 1004 is the conical absorbent guide ring, and 1005 is the absorbent collection funnel; 2000 is the absorbent collection tank, 2001 is the air inlet, 2002 is the pressurizing fan, 2003 is the main ventilation pipe, 2004 is the aeration network pipe, 2005 is the aeration head, 2006 is the ultrasonic transducer plate, 2007 is the ultrasonic transducer, 3000 is the absorbent circulation tank, 3001 is the spray pump, 3002 is the spray pipe, 3003 is the spray device, 3004 is the overflow pipe, 4001 is the control main board, 4002 is the alkali addition module, and 4003 is the pH detection device. Detailed Implementation

[0046] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0049] In one specific embodiment, this utility model provides an exhaust gas treatment device system coupled with ultrasonic waves, such as... Figure 1 As shown, the exhaust gas treatment device system includes: a reaction tower 1000, an absorbent collection tank 2000, an absorbent circulation tank 3000, and an automatic control unit; The reaction tower 1000 and the absorbent collection tank 2000 are connected by a bottom absorbent delivery pipe; the reaction tower 1000 and the absorbent circulation tank 3000 are connected by an overflow pipe 3004. The top of the reaction tower 1000 is provided with an exhaust port 1001, and the bottom is provided with an ultrasonic absorption unit; a spray device 3003 is provided between the exhaust port 1001 and the ultrasonic absorption unit. The automated control unit is used to control the operation of the exhaust gas treatment system; The ultrasonic absorption unit includes an aeration device and an ultrasonic device; the ultrasonic device is disposed between the aeration device and the exhaust port 1001; the aeration device is connected to the pressurizing fan 2002 through the main ventilation pipe 2003; the pressurizing fan 2002 is provided with an air inlet 2001. The aeration device includes an aeration network pipe 2004; such as Figure 2 As shown, several aeration heads 2005 are evenly distributed on the aeration network pipe 2004; The ultrasonic device includes at least four ultrasonic transducer plates 2006 that are staggered and fixedly arranged on the inner wall of the reaction tower; such as Figure 3 As shown, a plurality of ultrasonic transducers 2007 are evenly distributed on the ultrasonic transducer plate 2005. In the direction away from the ultrasonic device, the reaction tower 1000 is sequentially provided with a packing layer 1003 and a demister 1002; the spraying device 3003 is disposed between the packing layer 1003 and the demister 1002; a conical absorbent guide ring 1004 is fixedly provided on the side wall of the packing layer 1003. An absorbent collection funnel 1005 is provided between the conical absorbent guide ring 1004 and the ultrasonic device; the outlet of the absorbent collection funnel 1005 passes through the side wall of the reaction tower 1000 and is connected to the absorbent collection tank 2000. The spraying device 3003 is connected to the spraying pump 3001 via the spraying pipe 3002; the spraying pump 3001 is installed inside the absorption liquid circulation tank 3000. The automated control unit includes a control motherboard 4001, a pH detection device 4003, and an alkali addition module 4002; the pH detection device 4003 is installed on the overflow pipe 3004; the alkali addition module 4002 is installed on the top of the absorption liquid circulation tank 3000; the control motherboard 4001 is connected to the pH detection device 4003, the alkali addition module 4002, the ultrasonic absorption unit, and the spraying device.

[0050] Example 1 This embodiment provides a tail gas treatment device system coupled with ultrasonic waves, such as... Figure 1 As shown, the exhaust gas treatment device system includes: a reaction tower 1000, an absorbent collection tank 2000, an absorbent circulation tank 3000, and an automatic control unit; The reaction tower 1000 and the absorbent collection tank 2000 are connected by a bottom absorbent delivery pipe; the reaction tower 1000 and the absorbent circulation tank 3000 are connected by an overflow pipe 3004. The top of the reaction tower 1000 is provided with an exhaust port 1001, and the bottom is provided with an ultrasonic absorption unit; a spray device 3003 is provided between the exhaust port 1001 and the ultrasonic absorption unit. The automated control unit is used to control the operation of the exhaust gas treatment system; The ultrasonic absorption unit includes an aeration device and an ultrasonic device; the ultrasonic device is disposed between the aeration device and the exhaust port 1001; the aeration device is connected to the pressurizing fan 2002 through the main ventilation pipe 2003; the pressurizing fan 2002 is provided with an air inlet 2001. The aeration device includes an aeration network pipe 2004; such as Figure 2 As shown, several aeration heads 2005 are evenly distributed on the aeration network pipe 2004; The ultrasonic device includes four ultrasonic transducer plates 2006 that are staggered and fixedly installed on the inner wall of the reaction tower; such as Figure 3 As shown, a plurality of ultrasonic transducers 2007 are evenly distributed on the ultrasonic transducer plate 2005. In the direction away from the ultrasonic device, the reaction tower 1000 is sequentially provided with a packing layer 1003 and a demister 1002; the spraying device 3003 is disposed between the packing layer 1003 and the demister 1002; a conical absorbent guide ring 1004 is fixedly provided on the side wall of the packing layer 1003. An absorbent collection funnel 1005 is provided between the conical absorbent guide ring 1004 and the ultrasonic device; the outlet of the absorbent collection funnel 1005 passes through the side wall of the reaction tower 1000 and is connected to the absorbent collection tank 2000. The spraying device 3003 is connected to the spraying pump 3001 via the spraying pipe 3002; the spraying pump 3001 is installed inside the absorption liquid circulation tank 3000. The automated control unit includes a control motherboard 4001, a pH detection device 4003, and an alkali addition module 4002; the pH detection device 4003 is installed on the overflow pipe 3004; the alkali addition module 4002 is installed on the top of the absorption liquid circulation tank 3000; the control motherboard 4001 is connected to the pH detection device 4003, the alkali addition module 4002, the ultrasonic absorption unit, and the spraying device.

[0051] Example 2 This embodiment provides an exhaust gas treatment device system coupled with ultrasonic waves. The only difference between this exhaust gas treatment device system and Embodiment 1 is that: In this embodiment, the number of ultrasonic transducers is adjusted to one.

[0052] Example 3 This embodiment provides an exhaust gas treatment device system coupled with ultrasonic waves. The only difference between this exhaust gas treatment device system and Embodiment 1 is that: This embodiment omits the inclusion of the filler layer.

[0053] Example 4 This embodiment provides an exhaust gas treatment device system coupled with ultrasonic waves. The only difference between this exhaust gas treatment device system and Embodiment 1 is that: This embodiment omits the setting of the conical absorbent guide ring.

[0054] Example 5 This embodiment provides an exhaust gas treatment device system coupled with ultrasonic waves. The only difference between this exhaust gas treatment device system and Embodiment 1 is that: This embodiment omits the aeration device in the ultrasonic absorption unit.

[0055] Example 6 This embodiment provides an exhaust gas treatment device system coupled with ultrasonic waves. The only difference between this exhaust gas treatment device system and Embodiment 1 is that: This embodiment omits the installation of a pressurizing fan.

[0056] Comparative Example 1 This comparative example provides an exhaust gas treatment device system coupled with ultrasonic waves, the only difference between the exhaust gas treatment device system and Example 1 is: This comparative example omits the inclusion of the ultrasonic device in the ultrasonic absorption unit.

[0057] Comparative Example 2 This comparative example provides an exhaust gas treatment device system coupled with ultrasonic waves, the only difference between the exhaust gas treatment device system and Example 1 is: This comparative example omits the installation of the absorbent collection funnel and absorbent collection tank; that is, the absorbent is directly collected at the bottom of the reaction tower after passing through the spray device.

[0058] Comparative Example 3 This comparative example provides an exhaust gas treatment device system coupled with ultrasonic waves, the only difference between the exhaust gas treatment device system and Example 1 is: This comparative example omits the installation of the spraying device.

[0059] Comparative Example 4 This comparative example provides an exhaust gas treatment device system coupled with ultrasonic waves, the only difference between the exhaust gas treatment device system and Example 1 is: This comparative example omits the settings for the automation control unit.

[0060] Comparative Example 5 This comparative example provides an exhaust gas treatment device system coupled with ultrasonic waves, the only difference between the exhaust gas treatment device system and Example 1 is: This comparative example omits the overflow pipe and absorbent circulation tank, and installs the pH detection device and alkali addition module on the top of the absorbent collection tank, and places the spray pump inside the absorbent collection tank.

[0061] Application examples The exhaust gas treatment device system with coupled ultrasonic waves provided in the above embodiments and comparative examples is used to treat nitrogen oxides in exhaust gas. The absorbent used in the treatment process is an alkaline solution, and the ultrasonic transducer plate operates at a frequency of 20~40kHz with a power density of 0.5~2W / cm³. 2 When the pH value of the alkaline solution in the circulation tank is <9, the control unit controls the alkali addition module to add alkali; when the pH value is >13, the alkali addition module stops adding alkali.

[0062] Based on the treatment effect, the exhaust gas treatment device system with coupled ultrasonic waves provided in the above embodiments and comparative examples was analyzed, and the analysis results are as follows: (1) As can be seen from Example 1, the device system provided by this utility model can achieve efficient treatment of nitrogen oxides, with an absorption efficiency of up to 97-99%; (2) Analysis of Examples 1 and 2 shows that when the number of ultrasonic transducers is reduced, the residence time of the exhaust gas in the alkaline solution is shortened, which in turn affects the absorption of nitrogen oxides. (3) Analysis of Examples 1 and 3 shows that omitting the filler layer leads to a 15-25% decrease in absorption efficiency; (4) Analysis of Examples 1 and 4 shows that if the conical absorbent guide ring is omitted, more than 50% of the spray liquid will return to the bottom of the reaction tower and enter the circulation pool through the overflow pipe. This results in more than 50% of the absorbent liquid not undergoing ultrasonic action and low-efficiency circulation (spray head - reaction tower overflow pipe - circulation pool - circulation pump - spray head), which in turn affects the absorption efficiency of the tail gas. (5) Analysis of Examples 1, 5 and Comparative Example 1 shows that the ultrasonic absorption unit realizes the aeration of the exhaust gas. If the aeration device is omitted, the bubbles entering the absorption liquid will be too large, the rising speed will be fast, the ultrasonic action time will be short, and the ultrasonic efficiency will be low. If the ultrasonic device is omitted, the absorption efficiency of the reaction tower will decrease by 75% to 85%. In order to make the exhaust gas meet the emission standards, more than three layers of packing material need to be added. If the emission standards still cannot be met, one or more reaction towers need to be connected in series, which will increase the treatment cost and is not conducive to industrial application. (6) Analysis of Example 1 and Comparative Examples 2-5 shows that the setting of any structure in the device system of this utility model will affect the absorption efficiency of harmful components in the exhaust gas. Omitting the absorption liquid collection tank will lead to a decrease in absorption efficiency and severe backmixing. Omitting the spray device will lead to a decrease in absorption efficiency and require thickening of the demister baffle layer; Omitting the automated control unit will increase labor costs; in addition, unstable pH control of the absorption solution will lead to unstable absorption efficiency. Omitting the absorption liquid circulation tank will result in low overall system efficiency and system malfunction.

[0063] In summary, this invention, by combining the cavitation effect of ultrasound with the countercurrent contact of a conventional reaction tower, significantly improves the absorption rate of harmful components in the exhaust gas in the absorbent liquid, increases the utilization rate of the absorbent liquid, reduces equipment size, and decreases energy consumption.

[0064] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A tail gas treatment device system coupled with ultrasonic waves, characterized in that, The exhaust gas treatment device includes a reaction tower, an absorbent collection tank, an absorbent circulation tank, and an automated control unit. The reaction tower and the absorbent collection tank are connected by a bottom absorbent delivery pipe; the reaction tower and the absorbent circulation tank are connected by an overflow pipe. The top of the reaction tower is equipped with an exhaust port, and the bottom is equipped with an ultrasonic absorption unit. A spraying device is provided between the exhaust port and the ultrasonic absorption unit. The automated control unit is used to control the operation of the exhaust gas treatment system.

2. The exhaust gas treatment device system with coupled ultrasonic waves according to claim 1, characterized in that, The ultrasonic absorption unit includes an aeration device and an ultrasonic device; the ultrasonic device is disposed between the aeration device and the exhaust port. The aeration device is connected to a booster fan via a main air pipe; The pressurized blower is equipped with an air inlet.

3. The exhaust gas treatment device system with coupled ultrasonic waves according to claim 2, characterized in that, The aeration device includes an aeration network pipe; The aeration network pipe has several aeration heads evenly distributed on it.

4. The exhaust gas treatment device system with coupled ultrasonic waves according to claim 2, characterized in that, The ultrasonic device includes at least four ultrasonic transducer plates that are staggered and fixed to the inner wall of the reaction tower. Several ultrasonic transducers are evenly distributed on the ultrasonic transducer plate.

5. The exhaust gas treatment device system with coupled ultrasonic waves according to claim 1, characterized in that, In the direction away from the ultrasonic device, the reaction tower is sequentially equipped with a packing layer and a demister; the spraying device is located between the packing layer and the demister. A conical absorbent guide ring is fixedly provided on the side wall of the packing layer.

6. The exhaust gas treatment device system with coupled ultrasonic waves according to claim 5, characterized in that, An absorbent collection funnel is provided between the conical absorbent guide ring and the ultrasonic device; The outlet of the absorbent collection funnel penetrates the side wall of the reaction tower and is connected to the absorbent collection pool.

7. The exhaust gas treatment device system with coupled ultrasonic waves according to claim 1, characterized in that, The spraying device is connected to the spraying pump via a spraying pipe; The spray pump is installed inside the absorption liquid circulation tank.

8. The exhaust gas treatment device system with coupled ultrasonic waves according to claim 1, characterized in that, The automated control unit includes a control motherboard, a pH detection device, and an alkali addition module.

9. The exhaust gas treatment device system with coupled ultrasonic waves according to claim 8, characterized in that, The pH detection device is installed on the overflow pipe; The alkali addition module is installed on top of the absorption liquid circulation tank.

10. The exhaust gas treatment device system with coupled ultrasonic waves according to claim 8, characterized in that, The control board is connected to the pH detection device, the alkali addition module, the ultrasonic absorption unit, and the spraying device, respectively.

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