Exhaust gas treatment system

Abstract

The present invention discloses an exhaust gas treatment system for treating the exhaust gas generated by a sludge drying production line, which comprises an air inlet and a first gas-liquid mixing part. The air inlet is communicated with the first gas-liquid mixing part. The first gas-liquid mixing part includes a neutralization structure filled with a treatment liquid for treating exhaust gas, a first charging pipeline for the treatment liquid, and a first discharging pipeline for the treatment liquid. One side of the neutralization structure is communicated with the air inlet, and the other side of the neutralization structure is communicated with the first discharging pipeline. The exhaust gas can enter and pass through the neutralization structure and react with the treatment liquid. After being purified, it is discharged through the first discharging pipeline. This application utilizes the neutralization structure to increase the uniformity of the treatment liquid, ensuring that the pollutants in the exhaust gas are fully degraded. It solves the problem that due to excessive absorption of the exhaust gas, when the exhaust gas is transported into the water, the exhaust gas cannot continuously contact the liquid and is released before being completely neutralized with the liquid, resulting in a reduction in the absorption efficiency between the exhaust gas and the liquid and prone to secondary pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage sludge treatment, and particularly to an exhaust gas treatment system. Background Art

[0002] Sludge drying refers to the process of removing moisture from dewatered sludge through percolation or evaporation, etc. Sludge drying generally adopts thermal drying. After sludge dehydration, physical methods are used to further reduce the moisture content of the sludge, facilitating the transportation, stacking, utilization or further treatment of the sludge. When the sludge is dried, exhaust gas is generated. In order to avoid the impact of direct emission of exhaust gas on environmental pollution, an exhaust gas treatment system is used to neutralize and filter the generated exhaust gas, reducing the degree of environmental pollution caused by the exhaust gas. In the treatment system, the existing method uses water absorption to treat exhaust gas. The odor gas contacts with water and dissolves in water to achieve deodorization. It is only applicable to exhaust gas with water solubility and organized emission sources. The process is simple, easy to produce secondary pollution, and the treatment effect on mercaptan or fatty acid is not good. At the same time, during the absorption process of carrying the exhaust gas by using the water absorption method, due to excessive absorption of the exhaust gas, when the exhaust gas is transported into the water, the exhaust gas cannot continuously contact with the liquid, and the exhaust gas that is not completely neutralized with the liquid is directly discharged after being discharged, resulting in a reduction in the absorption efficiency between the exhaust gas and the liquid. Therefore, we propose an exhaust gas treatment system. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of low absorption rate and easy generation of secondary pollution in the prior art, and provide an exhaust gas treatment system.

[0004] The present invention solves the above technical problem through the following technical solutions:

[0005] An exhaust gas treatment system for treating the exhaust gas generated by a sludge drying production line, the exhaust gas treatment system includes a first gas-liquid mixing part and an air inlet, the air inlet is communicated with the first gas-liquid mixing part, and the feature is that the first gas-liquid mixing part includes a neutralization structure, a first charging pipeline and a first discharging pipeline, the neutralization structure is communicated with the air inlet and the first charging pipeline, so that the exhaust gas introduced from the air inlet and the treatment liquid introduced from the first charging pipeline carry out a neutralization reaction in the neutralization structure, and the first discharging pipeline is communicated with the neutralization structure.

[0006] In this solution, the exhaust gas is introduced into the neutralization structure in the first gas-liquid mixing part through the air inlet, the treatment liquid is charged into the neutralization structure in the first gas-liquid mixing part through the first charging pipeline, the exhaust gas and the treatment liquid react in the neutralization structure and are discharged through the first discharging pipeline after being purified, which is beneficial to the full reaction of the exhaust gas and the treatment liquid in the neutralization structure, and thus can improve the exhaust gas absorption rate and reduce secondary pollution.

[0007] Preferably, the neutralization structure includes at least one neutralization layer and a distribution pipeline. The distribution pipeline is in the same plane as and communicates with the first charging pipeline. The distribution pipeline is a plurality of concentric ring-shaped pipelines and has through holes. The through holes communicate the interior of the distribution pipeline and the neutralization layer. Each group of concentric distribution pipelines is in the same plane.

[0008] In this solution, when the treatment liquid flows into the neutralization layer from the first charging pipeline, the treatment liquid flows into the distribution pipeline through the first charging pipeline and fills into the neutralization layer through the through holes of the distribution channel, so that the treatment liquid flows into the neutralization layer, realizing the uniform distribution of the treatment liquid, improving the uniformity of the treatment liquid, and further improving the absorption rate.

[0009] Preferably, the distribution pipeline is arranged on the upper surface of each neutralization layer, and the through holes are arranged at the bottom and / or side surfaces of the distribution pipeline;

[0010] Or, the neutralization layer is provided with filling holes, and the filling holes communicate with the through holes.

[0011] In this solution, the distribution pipeline is laid on the upper surface of each neutralization layer, enabling the treatment liquid to uniformly enter each position of each layer over a larger area, improving the filling efficiency of the treatment liquid, and further improving the waste gas absorption rate.

[0012] In this solution, the through holes provide the treatment liquid for the filling holes. After a part of the treatment liquid in the filling holes reacts with the waste gas in contact, it flows out under the action of the waste gas pressure. When there are multiple filling holes in the neutralization layer, the multiple filling holes make the neutralization layer a hard or non-hard porous structure to achieve the uniform distribution of the treatment liquid, while increasing the contact area between the waste gas and the treatment liquid and further enhancing the absorption efficiency.

[0013] Preferably, the neutralization structure further includes a limiting sleeve and a limiting pin. The limiting sleeve is circumferentially sleeved on the outer edge of the neutralization layer. The limiting pin is arranged on the lower surface of each neutralization layer, and a limiting hole is arranged on the upper surface of each neutralization layer. The limiting pin passes through a plurality of the limiting holes.

[0014] In this solution, when there are multiple neutralization layers, the adjacent two limiting sleeves axially limit the two neutralization layers, and the limiting pin fixes the positions of the limiting sleeves by connecting the adjacent two limiting sleeves to perform radial and circumferential limiting on the limiting sleeves and the neutralization layers.

[0015] Preferably, the neutralization structure further includes a positioning plate. The positioning plate is fixedly connected to the neutralization layer, and the positioning plate is fixed in the limiting sleeve.

[0016] In this solution, the positioning plate is fixed in the limiting sleeve, and the limiting sleeve limits the positioning plate.

[0017] Preferably, the number of the first charging pipes is multiple, and the multiple first charging pipes penetrate through the neutralization layer and intersect at the center of the neutralization layer. The positioning plate is composed of two parts with the same shapes as the upper surfaces of the first charging pipes and the distribution pipes respectively, and the first charging pipes and the distribution pipes are fixed on the upper surface of the positioning plate.

[0018] In this solution, the multiple first charging pipes that penetrate through the neutralization layer and intersect at the center of the neutralization layer have a stable structure and a relatively high efficiency in transporting the treatment liquid, effectively improving the reaction absorption rate; the positioning plate composed of two parts with the same shapes as the upper surfaces of the first charging pipes and the distribution pipes respectively is conducive to fixing the first charging pipes and the distribution pipes on the positioning plate, and the first charging pipes and the distribution pipes fixed on the positioning plate can prevent the first charging pipes and the distribution pipes from being displaced significantly when the treatment liquid is introduced.

[0019] Preferably, the waste gas treatment system further includes a second gas-liquid mixing part. The upstream end of the first discharge pipe is communicated with the neutralization structure, and the downstream end is communicated with the second gas-liquid mixing part, and the second gas-liquid mixing part further treats the waste gas.

[0020] In this solution, the second gas-liquid mixing part is downstream of the first gas-liquid mixing part. The waste gas treated by the first gas-liquid mixing part is introduced into the second gas-liquid mixing part for further reaction, making the neutralization reaction more complete, so as to obtain a higher absorption rate.

[0021] Preferably, the second gas-liquid mixing part further includes a second charging pipe, a second discharge pipe, an air outlet pipe, a liquid storage cavity and a stirring device. The first discharge pipe leads into the liquid storage cavity, and the outlet height of the first discharge pipe is lower than the liquid level of the treatment liquid in the liquid storage cavity. The second charging pipe is connected to the liquid storage cavity and is used for introducing the treatment liquid. The stirring device is located at the bottom of the liquid storage cavity. The second discharge pipe leads from the liquid storage cavity to the outside of the waste gas treatment system, and the air outlet pipe leads from the liquid storage cavity to the outside of the waste gas treatment system.

[0022] In this solution, the waste gas treated once enters the liquid storage cavity in the second gas-liquid mixing part through the first discharge pipe, and the treatment liquid enters the liquid storage cavity through the second charging pipe. Since the outlet of the first discharge pipe is lower than the liquid level in the liquid storage cavity, the waste gas after the first-stage treatment will directly enter the treatment liquid in the liquid storage cavity for full reaction. A stirring device is arranged at the bottom of the liquid storage cavity to stir the treatment liquid for further full reaction. The second discharge pipe can discharge the treatment liquid in the liquid storage cavity to replace the treatment liquid in the liquid storage cavity and control the concentration of the treatment liquid in the liquid storage cavity.

[0023] Preferably, the second charging pipe includes a first pipe orifice and a second pipe orifice. The first pipe orifice is higher than the second pipe orifice, and the first pipe orifice and the second pipe orifice are connected by a U-shaped pipe. The treatment liquid enters the liquid storage cavity after passing through the first pipe orifice and the second pipe orifice in sequence.

[0024] In this solution, to prevent the waste gas in the liquid storage cavity from flowing back and polluting the charging part of the second charging pipe, the first pipe orifice is higher than the second pipe orifice and is connected by a U-shaped pipe, so that the liquid in the liquid storage cavity cannot flow to the first pipe orifice.

[0025] Preferably, the stirring device has a plurality of blades. The blades are higher than the pipe orifice of the first discharge pipe and have openings for the first discharge pipe to pass through.

[0026] In this solution, openings are provided in the blades so that the blades can avoid the first discharge pipe when rotating.

[0027] Preferably, the air outlet pipe leads from the liquid storage cavity to the outside and completely passes through the through hole of the first gas-liquid mixing part.

[0028] In this solution, when the treatment liquid reaches the saturation state, the waste gas is discharged from the air outlet pipe through the through hole of the first gas-liquid mixing part.

[0029] Preferably, the treatment system further includes a connecting pipe and a pump body. The connecting pipe is connected from the liquid storage cavity to the first charging pipe and leads to the neutralization layer, and the pump body is arranged in the connecting pipe.

[0030] In this solution, the use of the connecting pipe and the pump body can form a circulation space between the first gas-liquid mixing part and the second gas-liquid mixing part, improve the utilization rate of the treatment liquid and increase the treatment effect of the waste gas.

[0031] Preferably, the treatment system further includes a housing and a partition. The housing wraps the first gas-liquid mixing part and the second gas-liquid mixing part. The partition separates the first gas-liquid mixing part and the second gas-liquid mixing part. The housing has an upper cover, and an air outlet is provided on the upper cover. Through holes are provided on the partition for the first discharge pipe and the air outlet pipe to pass through.

[0032] In this solution, adding a housing to the outside of the first gas-liquid mixing part and the second gas-liquid mixing part can control the waste gas inside the housing, and the upper cover can facilitate subsequent maintenance and other uses; adding a partition between the first gas-liquid mixing part and the second gas-liquid mixing part can separate the two treatment parts; and through holes are provided on the partition for the first discharge pipe and the air outlet pipe to pass through.

[0033] The positive and progressive effects of the present invention are as follows: The waste gas is introduced into the neutralization structure in the first gas-liquid mixing part through the air inlet, the treatment liquid is filled into the neutralization structure in the first gas-liquid mixing part through the first filling pipeline, the waste gas and the treatment liquid react in the neutralization structure and are discharged through the first discharge pipeline after being purified, which is beneficial to the full reaction of the waste gas and the treatment liquid in the neutralization structure, and thus can improve the waste gas absorption rate and reduce secondary pollution. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of an exhaust gas treatment system in the present invention.

[0035] Figure 2 It is a schematic rear view structural diagram of an exhaust gas treatment system in the present invention.

[0036] Figure 3 It is a schematic sectional structural diagram of an exhaust gas treatment system in the present invention.

[0037] Figure 4 It is a schematic structural diagram of the neutralization structure in the present invention.

[0038] Figure 5 It is a schematic partial structural diagram of the neutralization structure in the present invention.

[0039] Description of the reference numerals: housing 1, partition 2, air inlet 3, upper cover 4, air outlet 5, outlet pipe 6, first discharge pipeline 7, motor 8, stirring device 9, second filling pipeline 10, connecting pipe 11, pump body 12, first gas-liquid mixing part 13, first filling pipeline 14, limiting sleeve 15, distribution pipeline 16, neutralization layer 17, positioning plate 18, limiting pin 19, support leg 20, liquid storage cavity 21. Detailed Description of the Invention

[0040] The present invention will be further described below by way of examples, but the present invention is not limited to the scope of the described examples.

[0041] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined. "Several" means one or more unless otherwise specifically defined.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Embodiment 1

[0046] As Figures 1-3 shown, an exhaust gas treatment system disclosed in an embodiment of the present application is used to treat the exhaust gas generated by a sludge drying production line. The exhaust gas treatment system includes a first gas-liquid mixing section 13 and an air inlet 3. The air inlet 3 is in communication with the first gas-liquid mixing section 13. The first gas-liquid mixing section 13 includes a neutralization structure, a first filling pipe 14, and a first discharge pipe 7. The neutralization structure is in communication with the air inlet 3 and the first filling pipe 14 so that the exhaust gas introduced from the air inlet 3 and the treatment liquid introduced from the first filling pipe 14 undergo a neutralization reaction in the neutralization structure. The first discharge pipe 7 is in communication with the neutralization structure. The exhaust gas enters the first gas-liquid mixing section 13 from the air inlet 3. Due to the pressure and fluidity of the gas, it contacts, mixes with, and reacts with the treatment liquid. After being purified, it is discharged from the first discharge pipe 7, which is beneficial for the exhaust gas to fully react with the treatment liquid in the neutralization structure, thereby improving the exhaust gas absorption rate and reducing secondary pollution.

[0047] The main components of the exhaust gas generated during the sludge drying process are malodorous gases such as ammonia and hydrogen sulfide. Currently, the common treatment technologies for malodorous gases are absorption methods, and the treatment liquid in the absorption method includes water, Na 2CO 3 Solutions, etc. The treatment liquid mentioned in this application is a solution capable of neutralizing harmful components in the waste gas. The type of treatment liquid can be selected according to the composition of the waste gas. The examples in this embodiment do not constitute a limitation to this application.

[0048] Such as Figure 3 and Figure 4 As shown, the neutralization structure includes at least one neutralization layer 17 and a distribution pipe 16. The distribution pipe 16 is in the same plane and communicates with the distribution pipe 16. The distribution pipe 16 is a plurality of concentric annular pipes and has through holes. The through holes connect the inside of the distribution pipe 16 and the neutralization layer 17. When the treatment liquid flows into the neutralization layer 17 from the first charging pipe 14, the treatment liquid flows into the distribution pipe 16 through the first charging pipe 14, and fills into the neutralization layer 17 through the through holes of the distribution channel, thereby enabling the treatment liquid to flow into the neutralization layer 17, realizing the uniform distribution of the treatment liquid, and improving the uniformity of the treatment liquid.

[0049] Such as Figure 5 As shown, the distribution pipe 16 is arranged on the upper surface of each neutralization layer 17, and the through holes are arranged at the bottom and / or side of the distribution pipe 16. Laying the distribution pipe 16 on the upper surface of each neutralization layer 17 enables the treatment liquid to uniformly enter each position of each layer over a larger area, improving the filling efficiency of the treatment liquid, and thus further improving the absorption rate.

[0050] In other alternative embodiments, the distribution pipe can also adopt other arrangement methods as long as it satisfies that the treatment liquid can enter the filling holes of the neutralization layer.

[0051] In this embodiment, the neutralization layer 17 is provided with filling holes. The filling holes communicate with the through holes on the distribution pipe 16. The through holes provide treatment liquid for the filling holes. After a part of the treatment liquid in the filling holes reacts with the waste gas in contact, it flows out under the action of the waste gas pressure. The filling holes enable the uniform distribution of the treatment liquid in the neutralization layer 17, and at the same time increase the contact area between the waste gas and the treatment liquid, further improving the absorption efficiency.

[0052] In this embodiment, there is no restriction on the number of filling holes in the neutralization layer 17. When there are multiple filling holes in the neutralization layer 17, the multiple filling holes are evenly distributed in the neutralization layer 17, making the neutralization layer 17 a rigid or non-rigid porous structure to realize the uniform distribution of the treatment liquid, and at the same time increase the contact area between the waste gas and the treatment liquid, further improving the absorption efficiency. Such as Figure 4As shown, the neutralization structure further includes a limiting sleeve 15 and a limiting pin 19. The limiting sleeve 15 is circumferentially sleeved on the outer edge of the neutralization layer 17. The limiting pin 19 is arranged on the lower surface of each neutralization layer 17, and a limiting hole is arranged on the upper surface of each neutralization layer 17. The limiting pin 19 passes through a plurality of limiting holes. When there are multiple neutralization layers 17, the adjacent two limiting sleeves 15 axially limit the space between the two neutralization layers 17, and the limiting pin 19 circumferentially and radially limits the limiting sleeve 15 and the neutralization layer by connecting the adjacent two limiting sleeves 15. When the multiple limiting sleeves 15 are sleeved and installed with each other, the limiting pin 19 limits the connection parts of the respective limiting sleeves 15, avoiding problems such as position deviation during the installation of the limiting sleeve 15, and increasing the convenience during the installation of the equipment. In other alternative embodiments, a plurality of neutralization layers 17 can share one limiting sleeve 15.

[0053] As Figure 5 shown, the neutralization structure further includes a positioning plate 18. The positioning plate 18 is fixedly connected to the neutralization layer 17 and is fixed in the limiting sleeve 15, which increases the stability of the neutralization layer 17 during installation and simultaneously avoids the problem of loosening of the neutralization layer 17 after installation.

[0054] As Figure 5 shown, the number of the first charging pipes 14 is multiple. The multiple first charging pipes 14 penetrate through the neutralization layer 17 and intersect at the center of the neutralization layer 17. The positioning plate 18 is composed of two parts with the same shapes as the upper surface of the first charging pipes 14 and the distribution pipes 16 respectively, and the first charging pipes 14 and the distribution pipes 16 are fixed on the upper surface of the positioning plate 18. The multiple first charging pipes 14 that penetrate through the neutralization layer 17 and intersect at the center of the neutralization layer 17 have a stable structure and a high efficiency in transporting the treatment liquid, effectively improving the reaction absorption rate. The fact that the positioning plate 18 is composed of two parts with the same shapes as the upper surface of the first charging pipes 14 and the distribution pipes 16 is conducive to fixing the first charging pipes 14 and the distribution pipes 16 on the positioning plate 18, and the fixation of the first charging pipes 14 and the distribution pipes 16 on the positioning plate 18 can prevent the first charging pipes 14 and the distribution pipes 16 from undergoing large displacements when the treatment liquid is introduced.

[0055] As Figures 1-3 shown, the first discharge pipe 7 leads to the liquid storage chamber. An air outlet pipe 6 is arranged above the liquid storage chamber and leads to the air outlet 5, and leads to the outside through the air outlet 5. After the waste gas passes through the first discharge pipe 7 and leads to the liquid storage chamber, it passes through the air outlet pipe 6 above the liquid storage chamber and leads to the outside through the air outlet 5, realizing the treatment of the waste gas.

[0056] As Figures 1-3As shown, the second charging pipe 10 leads to the liquid storage chamber. The second charging pipe 10 includes a first pipe orifice and a second pipe orifice. The first pipe orifice is higher than the second pipe orifice, and the first pipe orifice and the second pipe orifice are connected by a U-shaped pipe. The second discharge pipe leads from the liquid storage chamber to the outside. To prevent the waste gas in the liquid storage chamber from flowing back and polluting the charging part of the second charging pipe 10, the first pipe orifice is higher than the second pipe orifice and is connected by a U-shaped pipe. The treatment liquid enters the liquid storage chamber after passing through the first pipe orifice and the second pipe orifice in sequence, preventing the liquid in the liquid storage chamber from flowing to the position of the first pipe orifice. The second charging pipe 10 is the total charging inlet of the treatment liquid. When the treatment liquid is saturated, the saturation degree of the treatment liquid can be adjusted by supplementing the solute; or directly discharge the saturated treatment liquid from the second discharge pipe and charge new treatment liquid from the second charging pipe 10. This ensures that the waste gas is continuously absorbed and treated, improving the absorption efficiency.

[0057] As Figures 3-5 shown, the air outlet pipe 6 leads from the liquid storage chamber to the outside and the air outlet pipe 6 completely passes through the through hole of the first gas-liquid mixing part. The waste gas is discharged from the air outlet pipe 6 through the through hole of the first gas-liquid mixing part.

[0058] As Figures 1-3 shown, the treatment system further includes a connecting pipe 11 and a pump body 12. The connecting pipe 11 is connected from the liquid storage chamber to the first charging pipe 14 leading to the neutralization layer 17, and the pump body 12 is arranged in the connecting pipe 11. The pump body 12 is used to lead the treatment liquid from the liquid storage chamber to the neutralization layer 17.

[0059] As Figures 1-3 shown, the treatment system further includes a housing 1 and a partition plate 2. The housing 1 wraps the first gas-liquid mixing part and the liquid storage chamber. The housing 1 has an upper cover 4, and an air outlet 5 is arranged on the upper cover 4. The partition plate 2 separates the first gas-liquid mixing part and the liquid storage chamber, and through holes are left on the partition plate 2 for the first discharge pipe 7 and the air outlet pipe 6 to pass through, so that the waste gas can be controlled inside the housing 1. By arranging the upper cover 4, it is convenient for subsequent maintenance and other uses; the partition plate 2 divides the housing 1 into two parts. When the waste gas enters the housing 1 from the air inlet 3, due to the pressure and fluidity of the gas, it will contact, mix with the treatment liquid in the neutralization structure in the upper half part, and react, realizing the treatment of the harmful components in the waste gas and discharging from the lower half part.

[0060] As Figures 1-3 shown, specifically, bolts can be installed between the upper cover 4 and the housing 1. Through the mutual socketting and limitation between the upper cover 4 and the housing 1, the upper cover 4 can seal and limit the upper part of the housing 1. At the same time, by opening the upper cover 4, the materials installed inside the housing 1 can be repaired and processed.

[0061] As Figures 1-3 shown, support legs 20 are further arranged at the bottom of the housing 1, avoiding the direct contact of the bottom of the housing 1 with the ground, realizing noise reduction, and protecting the bottom of the housing 1.

[0062] In other alternative embodiments, the liquid storage chamber 21 and the air outlet pipe 6 may not be provided, and the waste gas is directly discharged through the first discharge pipe 7.

[0063] In the above embodiment, the waste gas enters the first gas-liquid mixing part 13 from the air inlet 3, reacts with the treatment liquid in the neutralization layer 17 through gas pressure and passes through the neutralization layer 17, and then is discharged into the liquid storage chamber 21 through the first discharge pipe 7. After sufficient reaction, the waste gas leaves the treatment liquid in the liquid storage chamber 21, reaches the air outlet 5 through the air outlet pipe 6 and is finally discharged to the outside. In other alternative embodiments, since there is no liquid storage chamber 21 and air outlet pipe 6, the waste gas is directly discharged to the outside through the first discharge pipe 7 after leaving the neutralization layer 17.

[0064] Embodiment 2

[0065] As Figures 1-3 shown, this embodiment provides another waste gas treatment system. The waste gas treatment system in this embodiment is basically the same as that in Embodiment 1, and the main difference is that in this embodiment, the liquid storage chamber is expanded into a second gas-liquid mixing part and a circulation structure is added.

[0066] As Figures 1-3 shown, the waste gas treatment system further includes a second gas-liquid mixing part. The upstream end of the first discharge pipe 7 is communicated with the neutralization structure, and the downstream end is communicated with the second gas-liquid mixing part. The waste gas processed by the first gas-liquid mixing part 13 is introduced into the second gas-liquid mixing part for further reaction, which can realize the secondary treatment of the waste gas and further improve the absorption efficiency of the waste gas.

[0067] As Figures 1-3 shown, the second gas-liquid mixing part further includes a second charging pipe 10, an air outlet pipe 6, a liquid storage chamber and a stirring device 9. The first discharge pipe 7 is introduced into the liquid storage chamber, and the outlet height of the first discharge pipe 7 is lower than the liquid level of the treatment liquid in the liquid storage chamber. The second charging pipe 10 is connected to the liquid storage chamber and is used to introduce the treatment liquid. The stirring device 9 is located at the bottom of the liquid storage chamber. The second discharge pipe leads from the liquid storage chamber to the outside of the waste gas treatment system, and the air outlet pipe 6 leads from the liquid storage chamber to the outside of the waste gas treatment system. The liquid storage chamber not only stores the treatment liquid but also conducts reactions. Driven by the motor 8, the stirring device 9 rotates to realize the full mixing of the waste gas and the treatment liquid, further improving the sufficiency and absorption rate of waste gas absorption. The characteristics and functions of the second charging pipe 10 and the second discharge pipe are the same as those in Embodiment 1.

[0068] In other alternative embodiments, the stirring device may not be provided, and the waste gas is directly introduced into the treatment liquid for reaction and then discharged.

[0069] As Figure 3As shown, the stirring device 9 has multiple blades. The blades are higher than the nozzle of the first discharge pipe 7 and have openings for the first discharge pipe 7 to pass through. Openings are provided on the blades to enable the blades to avoid the first discharge pipe 7 when rotating.

[0070] In other alternative embodiments, the structure of the stirring device is not limited to the multi-blade structure. In other alternative embodiments, the structure of the stirring device can adopt other structures, such as a single-blade structure or a turbine structure. As Figures 1-3 shown, the processing system further includes a circulation structure. The circulation structure includes a connecting pipe 11 and a pump body 12. The connecting pipe 11 is connected from the liquid storage chamber to the first charging pipe 14 leading to the neutralization layer 17, and the pump body 12 is arranged in the connecting pipe 11. Using the connecting pipe 11 and the pump body 12 can form a circulation space between the first gas-liquid mixing part 13 and the second gas-liquid mixing part, improving the utilization rate of the processing liquid and enhancing the treatment effect of the waste gas.

[0071] In other alternative embodiments, the circulation structure composed of the connecting pipe 11 and the pump body 12 may not be provided, and the same or different processing liquids can be freely introduced into the first gas-liquid mixing part 13 and the second gas-liquid mixing part.

[0072] As Figures 1-3 shown, the processing system further includes a housing 1 and a partition 2. The housing 1 encloses the first gas-liquid mixing part 13 and the second gas-liquid mixing part. The housing 1 has an upper cover 4, and an air outlet 5 is provided on the upper cover 4. The partition 2 separates the first gas-liquid mixing part 13 and the second gas-liquid mixing part, and through holes are provided on the partition 2 for the first discharge pipe 7 and the air outlet pipe 6 to pass through. Adding the housing 1 outside the first gas-liquid mixing part 13 and the second gas-liquid mixing part can control the waste gas inside the housing 1, and setting the upper cover 4 facilitates subsequent maintenance and other uses; adding the partition 2 between the first gas-liquid mixing part 13 and the second gas-liquid mixing part can separate the two processing parts; and through holes are provided on the partition 2 for the first discharge pipe 7 and the air outlet pipe 6 to pass through.

[0073] In the above embodiment, the waste gas enters the first gas-liquid mixing part 13 from the air inlet 3, reacts with the processing liquid in the neutralization layer 17 through gas pressure and passes through the neutralization layer 17, then is discharged into the second gas-liquid mixing part through the first discharge pipe 7, is stirred by the stirring device 9 in the liquid storage chamber 21 and reacts with the processing liquid, and then the waste gas and the processing liquid are pumped by the pump body 12 through the connecting pipe 11 to the first charging pipe 14 and recycled to the neutralization layer 17 again. After sufficient reaction, the waste gas leaves the processing liquid in the liquid storage chamber 21, reaches the air outlet 5 through the air outlet pipe 6 and is finally discharged to the outside.

[0074] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An exhaust gas treatment system for treating the exhaust gas generated by a sludge drying production line. The exhaust gas treatment system includes a first gas-liquid mixing part and an air inlet, and the air inlet is communicated with the first gas-liquid mixing part. It is characterized in that the first gas-liquid mixing part includes a neutralization structure, a first filling pipe and a first discharge pipe. The neutralization structure is communicated with the air inlet and the first filling pipe, so that the exhaust gas introduced from the air inlet and the treatment liquid introduced from the first filling pipe undergo a neutralization reaction in the neutralization structure, and the first discharge pipe is communicated with the neutralization structure; the neutralization structure includes at least one neutralization layer and a distribution pipe. The distribution pipe is in the same plane as and communicated with the first filling pipe. The distribution pipe is a plurality of concentric annular pipes and has through holes. The through holes communicate the inside of the distribution pipe and the neutralization layer. The distribution pipes on each neutralization layer are in the same plane. The number of the first filling pipes is multiple, and the multiple first filling pipes penetrate through the neutralization layer and intersect at the center of the neutralization layer; the upper surface of each neutralization layer is provided with the distribution pipe, and the through holes are arranged at the bottom and / or side surface of the distribution pipe; the neutralization layer is provided with filling holes, and the filling holes are communicated with the through holes; the neutralization structure further includes a limiting sleeve and a limiting pin. The limiting sleeve is circumferentially sleeved on the outer edge of the neutralization layer, the limiting pin is arranged on the lower surface of each neutralization layer, and a limiting hole is arranged on the upper surface of each neutralization layer. The limiting pin penetrates through the multiple limiting holes; the exhaust gas treatment system further includes a second gas-liquid mixing part. The upstream end of the first discharge pipe is communicated with the neutralization structure, and the downstream end is communicated with the second gas-liquid mixing part. A treatment liquid for performing a neutralization reaction with the exhaust gas is arranged in the second gas-liquid mixing part; the second gas-liquid mixing part further includes a second filling pipe, a second discharge pipe, an air outlet pipe, a liquid storage cavity and a stirring device. The first discharge pipe leads into the liquid storage cavity, and the outlet height of the first discharge pipe is lower than the liquid level of the treatment liquid in the liquid storage cavity. The second filling pipe is connected to the liquid storage cavity and is used for introducing the treatment liquid. The stirring device is located at the bottom of the liquid storage cavity. The second discharge pipe leads from the liquid storage cavity to the outside of the exhaust gas treatment system, and the air outlet pipe leads from the liquid storage cavity to the outside of the exhaust gas treatment system; the exhaust gas treatment system further includes a connecting pipe and a pump body. The pump body is arranged on the connecting pipe, and the connecting pipe communicates the inside of the liquid storage cavity and the first filling pipe.

2. The exhaust gas treatment system according to claim 1, It is characterized in that the neutralization structure further includes a positioning plate. The positioning plate is fixedly connected to the neutralization layer, and the positioning plate is fixed in the limiting sleeve.

3. The exhaust gas treatment system according to claim 2, It is characterized in that the positioning plate includes two parts whose upper surfaces are respectively the same as the shapes of the first filling pipe and the distribution pipe, and the first filling pipe and the distribution pipe are fixed on the upper surface of the positioning plate.

4. The exhaust gas treatment system according to claim 1, characterized in that, the second charging pipe includes a first pipe orifice and a second pipe orifice, the first pipe orifice is higher than the second pipe orifice, the first pipe orifice and the second pipe orifice are connected by a U-shaped pipe, and the treatment liquid enters the liquid storage cavity after passing through the first pipe orifice and the second pipe orifice in sequence; and / or, the stirring device has a plurality of blades, the blades are higher than the pipe orifice of the first discharge pipe and have openings for the first discharge pipe to pass through; and / or, the air outlet pipe leads from the liquid storage cavity to the outside and the air outlet pipe completely passes through the through hole of the first gas-liquid mixing part.

5. The exhaust gas treatment system according to claim 4, characterized in that, the exhaust gas treatment system further includes a housing and a partition board, the housing accommodates the neutralization structure in the first gas-liquid mixing part, the first discharge pipe, the liquid storage cavity in the second gas-liquid mixing part, the stirring device and the air outlet pipe, the partition board separates the neutralization structure and the liquid storage cavity, the housing has an upper cover, an air outlet is arranged on the upper cover, the air outlet pipe passes through the upper cover, the air outlet pipe is communicated with the air outlet, and through holes are left on the partition board for the first discharge pipe and the air outlet pipe to pass through.

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