CN213493734U

CN213493734U - Catalyst gel preparation facilities

Info

Publication number: CN213493734U
Application number: CN202120763019.7U
Authority: CN
Inventors: 华凤男
Original assignee: Guizhou Tailida Technology Co ltd
Current assignee: Guizhou Tailida Technology Co ltd
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2021-06-22
Anticipated expiration: 2031-04-14

Abstract

The utility model discloses a catalyst gel preparation facilities. The device comprises a reaction kettle and a stirring device. The reaction kettle comprises a kettle body and a reaction chamber formed by enclosing the kettle body, wherein the top of the kettle body is provided with a feed inlet, an exhaust port and a stirring device connector which are communicated with the reaction chamber, and the bottom of the kettle body is provided with a discharge port communicated with the reaction chamber. The stirring device comprises a stirring shaft rod and a stirrer connected to the stirring shaft rod, the stirring shaft rod extends to the reaction chamber through a stirring device connecting port, and the stirrer comprises an anchor stirrer connected to the bottom end of the stirring shaft rod and a paddle stirrer located on the top side of the anchor stirrer.

Description

Catalyst gel preparation facilities

Technical Field

The utility model belongs to the technical field of catalyst preparation equipment, concretely relates to catalyst gel preparation facilities.

Background

The metal oxide catalyst is generally prepared by a precipitation method, a coprecipitation method, and a gel sol method. The preparation processes usually adopt nitrate as a raw material, and the production process also involves operations such as filtration, washing and the like. The process has long flow, and the loss of raw materials of metal salts is large because of the difference of pH values of precipitates formed by different kinds of metal salts, and the discharge of waste water containing metal ions and nitrates is also caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a catalyst gel preparation facilities aims at promoting metal ion's in the raw materials utilization efficiency, reduces wastewater discharge simultaneously.

The utility model provides a catalyst gel preparation facilities, it includes:

the reaction kettle comprises a kettle body and a reaction chamber formed by enclosing the kettle body, wherein the top of the kettle body is provided with a feed inlet, an exhaust port and a stirring device connector which are communicated with the reaction chamber, and the bottom of the kettle body is provided with a discharge outlet communicated with the reaction chamber;

agitating unit, including stirring axostylus axostyle and connect the agitator on stirring axostylus axostyle, stirring axostylus axostyle is extended to reaction chamber by the agitating unit connector, and the agitator is including connecting the anchor agitator in stirring axostylus axostyle bottom and being located the oar agitator towards the top side of anchor agitator.

In any embodiment of the present invention, the distance between the anchor stirrer and the bottom of the reaction vessel is 5cm to 10 cm.

In any embodiment of the present invention, the ratio of the outer diameter of the anchor stirrer to the inner diameter of the kettle body is (0.85-0.95): 1.

The utility model discloses in any embodiment, the stirring axostylus axostyle is connected with more than two sets of oar formula agitators in self direction of height, and every group oar formula agitator includes more than two stirring paddle leaf along the circumference distribution of stirring axostylus axostyle.

In any embodiment of the present invention, the stirring blade may be selected from one or more of a straight blade paddle and a folding blade paddle.

The utility model discloses in any embodiment, the central axis of stirring axostylus axostyle coincides with the central axis of the cauldron body.

In any embodiment of the present invention, the anchor agitator is of a U-shaped configuration. One of more than two groups of paddle type stirrers, which is relatively close to the anchor type stirrer, can be positioned in the U-shaped structure of the anchor type stirrer, and the ratio of the length of the stirring paddle in the paddle type stirrer to the inner diameter of the kettle body is (0.25-0.4): 1.

In any embodiment of the utility model, one group of the more than two groups of paddle type stirrers which are relatively close to the anchor type stirrer is higher than the anchor type stirrer, and the ratio of the length of the stirring paddle in the paddle type stirrers to the inner diameter of the kettle body is (0.35-0.45): 1.

In any embodiment of the present invention, the ratio of the length of the stirring blades of the remaining two or more paddle stirrers to the inner diameter of the kettle body is (0.35-0.45): 1.

The utility model discloses in any embodiment, agitating unit still includes the motor of being connected with the stirring axostylus axostyle, and the motor is inverter motor.

In any embodiment of the utility model, the kettle body comprises an inner wall and an outer wall sleeved outside the inner wall, and an interlayer is formed between the inner wall and the outer wall, wherein the interlayer is used for the circulation of a heating medium; or a coil pipe surrounding the inner wall is arranged in the interlayer and is used for circulating the heating medium.

The utility model discloses in any embodiment, the bottom of the cauldron body is protruding circular arc structure, and protruding circular arc structure includes central part and the side part around central part in its footpath, and the discharge gate is located side part.

The utility model discloses in any embodiment, the internal face of the cauldron body is provided with the baffle corresponding to the discharge gate, and the discharge gate can be closed or opened to the baffle.

In any embodiment of the utility model, the discharge port is connected with a back washing pipeline.

In any embodiment of the present invention, the apparatus further comprises a reducing agent inlet, wherein the reducing agent inlet is located at the top of the kettle body and is communicated with the reaction chamber; or the reducing agent inlet is positioned at the side part of the kettle body and is communicated with the reaction chamber; or the stirring shaft rod is of a hollow structure, and the stirring shaft rod is provided with an opening communicated with the reaction chamber.

In any embodiment of the present invention, the diameter of the exhaust port is 25% -40% of the inner diameter of the reaction kettle.

In any embodiment of the present invention, the device further comprises a condenser connected to the exhaust port.

The utility model discloses in any embodiment, the device still includes the solution and prepares the jar, and the solution is prepared the jar and is connected with the feed inlet, and the solvent import of the jar is prepared to the solution is connected with the comdenstion water exit linkage of condenser.

In any embodiment of the present invention, the apparatus further comprises a gas purification device connected to the noncondensable gas outlet of the condenser. In some embodiments, the gas purification device is a NOx redox device, and the reductant inlet of the NOx redox device is connected to the ammonia storage device.

According to the utility model discloses a catalyst gel preparation facilities can implement the technology of preparation catalyst gel of evaporation hydrolysis. Nitrate raw materials are added into the reaction kettle through a feeding hole, gel is formed through evaporation and hydrolysis, and gas phase substances formed in the evaporation and hydrolysis process are discharged through an exhaust port. The device is provided with a stirring device which comprises an anchor stirrer connected with a stirring shaft rod and positioned at the bottom end and a paddle stirrer positioned at the side of the anchor stirrer and facing to the top part, so that the reaction system can be fully mixed, and the smooth heat and mass transfer in the whole process of forming gel is ensured.

The device for preparing the catalyst gel can save the operations of filtering and washing in the traditional preparation process, so the production process is simple, particularly the utilization efficiency of metal ions in raw materials is high, the loss is small, meanwhile, the generation of waste liquid containing metal ions and soluble nitrate is remarkably reduced or even basically eliminated, and the problem of waste liquid treatment is effectively relieved. Furthermore, the evaporated water can be recycled after being cooled, so that resources are saved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a catalyst gel preparation apparatus provided by the present invention.

Fig. 2 is a schematic structural diagram of another catalyst gel preparation apparatus provided by the present invention.

Fig. 3 is a schematic structural diagram of another catalyst gel preparation apparatus provided by the present invention.

Fig. 4 is a schematic structural diagram of another catalyst gel preparation apparatus provided by the present invention.

Fig. 5 is a schematic structural diagram of another catalyst gel preparation apparatus provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present invention more clear, features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "above" and "below" are inclusive; "plural" and "several" mean two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships only for convenience in describing the present invention and to simplify the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

The above summary of the present invention is not intended to describe each disclosed embodiment or every implementation of the present invention. The following description more particularly exemplifies illustrative embodiments. At various points throughout this application, guidance is provided through a list of embodiments that can be used in various combinations. In each instance, the list is merely a representative group and should not be construed as exhaustive.

The invention creatively provides a process for preparing catalyst gel by evaporation hydrolysis, which can improve the utilization efficiency of metal ions in raw materials and reduce the discharge of waste water. In order to realize the process, a catalyst gel preparation device is also provided. Fig. 1 shows a schematic structural diagram of a catalyst gel preparation apparatus of the present invention. Referring to fig. 1, the present invention provides a catalyst gel preparation apparatus, which comprises a reaction kettle 100 and a stirring apparatus 200.

The reaction kettle 100 comprises a kettle body 110 and a reaction chamber 120 enclosed by the kettle body 110. The top T of the kettle body 110 is provided with a feed inlet 111, an exhaust port 112 and a stirring device connecting port 113 which are communicated with the reaction chamber 120. The bottom B of the kettle 110 is provided with a discharge port 114 communicated with the reaction chamber 120.

The stirring device 200 includes a stirring shaft 210 and a stirrer 220 connected to the stirring shaft 210. The stirring shaft 210 extends from the stirring device connection port 113 to the reaction chamber 120, and the stirrer 220 includes an anchor stirrer 221 connected to the bottom end of the stirring shaft 210 and a paddle stirrer 222 located on the side of the anchor stirrer 221 facing the top portion T.

According to the utility model discloses a catalyst gel preparation facilities can implement the technology of preparation catalyst gel of evaporation hydrolysis. Nitrate raw materials are added into the reaction kettle 100 through a feeding hole 111, gel is formed through evaporation and hydrolysis, and gas phase substances formed in the evaporation and hydrolysis process are discharged through an exhaust hole 112. The stirring device 200 is arranged in the device, and the stirring device 200 comprises an anchor stirrer 221 connected with the stirring shaft rod 210 and positioned at the bottom end and a paddle stirrer 222 positioned at the side, facing to the top T of the kettle body 110, of the anchor stirrer 221, so that the reaction system can be fully mixed, and the smooth heat and mass transfer in the whole process of gel formation is ensured.

In some embodiments, the central axis of the agitator shaft 210 coincides with the central axis of the kettle body 110. Thus, the stirring device 200 can sufficiently stir the materials in the kettle body 110, so that the materials can realize efficient heat and mass transfer, and the smooth reaction is promoted. In these embodiments, the stirring device connection port 113 may be located at a middle position of the top T of the kettle body 110. Thus, the stirring shaft 210 extends from the stirring device connection port 113 to the reaction chamber 120 such that the central axis thereof coincides with the central axis of the reaction vessel 100.

In some embodiments, the distance L1 between the anchor agitator 221 and the bottom B of the tank 110 is 5cm to 10 cm. This further improves the mixing of the materials.

In some embodiments, the ratio D1/D2 of the outer diameter D1 of the anchor agitator 221 to the inner diameter D2 of the kettle body 110 is (0.85-0.95): 1. D1/D2 is in a proper range, can fully stir the materials, and can prevent the abrasion between the anchor stirrer 221 and the kettle body 110.

In some embodiments, the stirring shaft 210 has two or more sets of paddle stirrers 222 connected thereto in the height direction thereof, and each set of paddle stirrers 222 includes two or more stirring blades 222a distributed along the circumferential direction of the stirring shaft 210. The stirring blade 222a may be one or more selected from straight blade paddles and folded blade paddles.

In some embodiments, the anchor agitator 221 is a U-shaped structure. Referring to fig. 1, one of the more than two sets of paddle stirrers 222, which is relatively close to the anchor stirrer 221, is disposed higher than the anchor stirrer 221. Further alternatively, the ratio L3/D2 of the length L3 of the stirring blade 222a of the set of paddle stirrers 222 relatively close to the anchor stirrer 221 to the inner diameter D2 of the kettle body 110 is (0.35-0.45): 1. The length of the stirring blade 222a is the dimension of the stirring blade 222a from the stirring shaft 210 to the free end thereof.

Referring to fig. 2, in other embodiments, more than two sets of paddle stirrers 222, one set relatively close to the anchor stirrer 221, may be located within the U-shaped configuration of the anchor stirrer 221. Further alternatively, the ratio L3/D2 of the length L3 of the stirring blade 222a in the set of paddle stirrers 222 to the inner diameter D2 of the kettle body 110 may be (0.25-0.4): 1.

In some embodiments, the ratio L3 '/D2 of the length L3' of the stirring blades 222a of the remaining paddle stirrers 222, excluding the set of paddle stirrers 222 near the anchor stirrer 221, to the inner diameter D2 of the kettle body 110 is (0.35-0.45): 1.

In the device, the stirring device 200 is reasonably designed, so that the materials can be mixed at a molecular level, the utilization rate of metal ions can be further improved, particularly, the device is favorable for obtaining gel with more uniform physicochemical properties, and finally the catalyst with better uniform stability is obtained.

In some embodiments, the stirring device 200 further comprises a motor 300 connected to the stirring shaft 210. The output shaft of the motor 300 may be connected to the stirring shaft 210 through a coupling, or may be connected to the stirring shaft 210 through a gear assembly to drive the stirring shaft 210 to rotate, thereby driving the stirrer 220 to perform a stirring function.

In some embodiments, the motor 300 is a variable frequency motor. As the viscosity of the material is gradually increased along with the process of the evaporation hydrolysis, the variable frequency motor is beneficial to the stirring device 200 to effectively stir the material, thereby ensuring the high-efficiency mass transfer in the whole process of gel formation.

In some embodiments, the autoclave body 110 may include an inner wall 115 and an outer wall 116 sleeved outside the inner wall 115, and an interlayer is formed between the inner wall 115 and the outer wall 116. The interlayer can be used for the circulation of the heating medium. Alternatively, a coil 117 surrounding the inner wall is provided in the sandwich layer, and the coil 117 is used for circulating the heating medium. The heating medium can be selected from heat transfer oil, hot water, steam, etc.

The inner wall 115 and outer wall 116 may be formed of materials known in the art. Such as stainless steel. In some embodiments, the inner wall surface of the inner wall 115 may be lined with an enamel or teflon resin. The inner liner layer can play a role in corrosion prevention.

In some embodiments, a reducing agent solution is also added during the evaporative hydrolysis reaction. The reducing agent solution can inhibit metal ions from being NO₃ ^﹣Oxidizing to improve the composition of the gel and thus the composition and performance of the catalyst.

Both the nitrate feedstock and the reducing agent solution may be added to the reaction chamber 120 from the feed port 111. In these embodiments, the feed port 111 is connected to a nitrate raw material supply device and a reducing agent solution supply device, respectively.

In other embodiments, the tank 110 may further include a reductant inlet 118. The reductant solution is added to the reaction chamber 120 from the reductant inlet 118. In these embodiments, the feed port 111 is connected to a nitrate source material supply device, and the reducing agent inlet 118 is connected to a reducing agent solution supply device.

Referring to fig. 1, as an example, the reducing agent inlet 118 may be located at the top T of the kettle body 110 and communicate with the reaction chamber 120. Optionally, the stirring device connection port 113 is located at the middle position of the top T of the kettle body 110. The feed port 111, the exhaust port 112, and the reducing agent inlet 118 are distributed on the periphery side of the agitator connection port 113.

Referring to fig. 3, as another example, the reducing agent inlet 118 may also be located at a side portion of the kettle body 110 and communicate with the reaction chamber 120. Alternatively, more than two reducing agent inlets 118 may be distributed along the circumferential direction of the kettle body 110. A feed nozzle 400 may be installed at the reducing agent inlet 118, the feed nozzle 400 being connected to a reducing agent solution supply device. In some embodiments, the central axis of the feed nozzle 400 forms an angle of 40 to 80 degrees with the central axis of the kettle body 110. Optionally, the included angle is 50 to 70 degrees.

Referring to fig. 4, a flow guide channel 211 is disposed in the stirring shaft 210, and an opening 212 communicating the reaction chamber 120 and the flow guide channel 211 is formed on the stirring shaft 210. The guide passage 211 is formed by extending the top end surface of the agitating shaft 210 by a predetermined depth in the length direction of the agitating shaft 210. The number of locations of the apertures 212 may be set as desired. In some embodiments, the opening 212 may be disposed between the anchor stirrer 221 and the paddle stirrer 222 relatively close to the anchor stirrer 221. Further alternatively, two openings 212 may be oppositely arranged along the circumference of the stirring shaft 210. In other embodiments, the openings 212 may also be disposed between two adjacent sets of paddle stirrers 222.

In some embodiments, the bottom B of the kettle body 110 is in a convex arc structure, the convex arc structure comprises a central portion B1 and a side portion B2 surrounding the central portion B1 in the radial direction of the convex arc structure, and the discharge port 114 is located at the side portion B2. The inventor has found that, compared with the arrangement of the outlet 114 in the central portion B1, the position of the outlet 114 in the side portions B2 can reduce the evaporation of the viscous material caused by the accumulation of the viscous material in the central portion B1, which is beneficial to the consistency of the gel and can reduce the phenomenon of blocking the outlet 114 to facilitate the discharging.

In some embodiments, the inner wall surface of the kettle body 110 is provided with a baffle 119 corresponding to the discharge port 114, and the baffle 119 can close or open the discharge port 114. During the gel preparation process, the baffle 119 closes the discharge port 114, preventing the material from entering and blocking the discharge port 114. After the gel is prepared, the baffle 119 is opened, and the material can be conveniently discharged.

The configuration of the baffle 119 may be selected as appropriate. As one example, the baffle 119 is pivotally coupled to the inner wall 115. Optionally, the baffle 119 may be provided with a connecting rod, and the inner wall 115 may be provided with a connecting hole, wherein the connecting rod may be rotatably connected to the connecting hole. Optionally, the connecting rod also passes through the outer wall 116 to connect to a turning handle (not shown). The shutter 119 may be conveniently rotated or locked by rotating the handle to close or open the discharge port 114.

Referring to fig. 5, in some embodiments, discharge port 114 may also be connected to a backwash conduit 500. The inside of the reaction vessel 100 can be washed by the back-washing pipe 500.

In some embodiments, the diameter of the exhaust port 112 is 25% to 40%, optionally 30% to 35%, of the inner diameter of the kettle body 110. This facilitates the evaporation of gaseous substances (e.g. water vapour, such as NOx, NH) produced by the hydrolysis process₃Equal decomposition products, etc.) in time to promote the formation of gel.

In some embodiments, the apparatus further comprises a condenser 600 connected to the exhaust port 112. The condenser 600 is used to condense gas phase substances to recycle evaporated water.

In some embodiments, the device further comprises a solution formulation tank 700. The solution preparation tank 700 may be a nitrate solution preparation tank 710 or a reducing agent solution preparation tank 720. The nitrate solution preparation tank 710 is connected to the feed port 111. A nitrate solution storage tank may also be provided between the nitrate solution preparation tank 710 and the feed port 111. The reducing agent solution preparation tank 720 is connected to the feed port 111 or the reducing agent inlet 115. A reducing agent solution storage tank may also be provided between the reducing agent solution preparation tank 720 and the feed port 111 or the reducing agent inlet 115 connected thereto.

In these embodiments, the solvent inlet of the solution formulating tank 700 may be connected with the condensed water outlet of the condenser 600. The condensed water thus formed by condensation in the condenser 600 is reused for solution preparation.

In some embodiments, the apparatus further comprises a gas purification apparatus 800 connected to the non-condensable gas outlet of the condenser 700. NOx and NH are generated in the process of reduction, evaporation and hydrolysis₃And the like. By removing these gases through the gas purification apparatus 800, environmental pollution can be avoidedAnd (6) dyeing.

In some embodiments, the gas cleaning device 800 is a NOx oxidation reduction device. In the NOx oxidation-reduction apparatus, it is possible to utilize, for example, NH under the action of a catalyst₃Reducing NOx to N with reducing gas₂. The catalyst may be a known catalyst for NOx reduction, for example, a redox catalyst containing copper oxide or cobalt oxide. The NOx redox device may employ an electrical heating device to control the reaction temperature. The reaction temperature is generally 400 ℃ to 450 ℃.

The reductant inlet of the NOx redox device may also be connected to an ammonia storage device 900. Thus, the reducing gas NH can be supplemented when needed₃。

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A catalyst gel preparation apparatus, comprising:

the reaction kettle comprises a kettle body and a reaction chamber formed by enclosing the kettle body, wherein the top of the kettle body is provided with a feed inlet, an exhaust port and a stirring device connecting port which are communicated with the reaction chamber, and the bottom of the kettle body is provided with a discharge outlet communicated with the reaction chamber;

a stirring device comprising a stirring shaft and a stirrer connected to the stirring shaft, the stirring shaft extending from the stirring device connection port to the reaction chamber, the stirrer comprising an anchor stirrer connected to a bottom end of the stirring shaft and a paddle stirrer located towards the top side of the anchor stirrer.

2. The catalyst gel preparation apparatus according to claim 1, wherein the distance between the anchor agitator and the bottom of the reaction tank is 5cm to 10 cm; and/or the presence of a gas in the gas,

the ratio of the outer diameter of the anchor stirrer to the inner diameter of the kettle body is (0.85-0.95): 1.

3. The catalyst gel preparation apparatus according to claim 1 or 2, wherein the stirring shaft rod is connected with two or more sets of paddle stirrers in a height direction thereof, each set of paddle stirrers including two or more stirring blades distributed in a circumferential direction of the stirring shaft rod;

the stirring paddle is selected from more than one of straight blade paddle and folding blade paddle.

4. The catalyst gel preparation apparatus according to claim 3, wherein a central axis of the stirring shaft coincides with a central axis of the tank body, and the anchor stirrer has a U-shaped structure in which,

one of more than two groups of paddle stirrers, which is relatively close to the anchor stirrer, is positioned in the U-shaped structure of the anchor stirrer, and the ratio of the length of the stirring blade in the paddle stirrer to the inner diameter of the kettle body is (0.25-0.4): 1; alternatively, the first and second electrodes may be,

one of the more than two groups of paddle type stirrers, which is relatively close to the anchor type stirrer, is higher than the anchor type stirrer, and the ratio of the length of the stirring paddle in the paddle type stirrers to the inner diameter of the kettle body is (0.35-0.45): 1.

5. The catalyst gel preparation apparatus according to claim 4, wherein the ratio of the length of the stirring blade of the remaining two or more groups of the blade stirrers to the inner diameter of the tank body is (0.35 to 0.45): 1.

6. The apparatus of claim 1, wherein the agitator further comprises a motor connected to the agitator shaft, the motor being a variable frequency motor.

7. The catalyst gel preparation apparatus according to claim 1, wherein the kettle body comprises an inner wall and an outer wall sleeved outside the inner wall, an interlayer is formed between the inner wall and the outer wall, wherein,

the interlayer is used for the circulation of a heating medium; alternatively, the first and second electrodes may be,

and a coil pipe surrounding the inner wall is arranged in the interlayer and is used for circulating a heating medium.

8. The catalyst gel preparation apparatus according to claim 1, wherein the bottom of the kettle body has a convex arc structure including a central portion and side portions surrounding the central portion in a radial direction thereof, and the discharge port is located in the side portions; and

the inner wall surface of the kettle body is provided with a baffle corresponding to the discharge port, and the baffle can close or open the discharge port.

9. The apparatus of claim 1, wherein the outlet is connected to a backwash line.

10. The catalyst gel preparation apparatus of claim 1, further comprising a reducing agent inlet, wherein,

the reducing agent inlet is positioned at the top of the kettle body and is communicated with the reaction chamber; alternatively, the first and second electrodes may be,

the reducing agent inlet is positioned on the side part of the kettle body and is communicated with the reaction chamber; alternatively, the first and second electrodes may be,

the stirring shaft lever is of a hollow structure, and the stirring shaft lever is provided with an opening communicated with the reaction chamber.

11. The catalyst gel preparation apparatus according to claim 1, wherein the diameter of the exhaust port is 25 to 40% of the inner diameter of the reaction vessel.

12. The catalyst gel preparation apparatus of claim 1, further comprising a condenser connected to the exhaust port.

13. The catalyst gel preparation apparatus according to claim 12, further comprising a solution preparation tank connected to the feed port, a solvent inlet of the solution preparation tank being connected to a condensed water outlet of the condenser; and/or the presence of a gas in the gas,

the condenser is characterized by further comprising a gas purification device connected to a non-condensable gas outlet of the condenser, the gas purification device is an NOx oxidation-reduction device, and a reducing agent inlet of the NOx oxidation-reduction device is connected with the ammonia gas storage device.