baffle-type small particle catalyst dosing equipment

Abstract

This invention relates to the field of pneumatic catalyst dispensing equipment, and particularly to a baffle-type small-particle catalyst dispensing equipment. It includes: a catalyst retention device comprising a horizontally arranged feed pipe; a Venturi tube feed device comprising a Venturi tube and a storage pipe, the upper end of the storage pipe being vertically connected to the feed pipe, and the lower end of the storage pipe being vertically connected to the Venturi tube; the catalyst retention device further includes two or more baffle plates, the upper end of which is fixed to the upper inner wall of the feed pipe, and the lower end is inserted into the storage pipe. Multiple through holes are evenly distributed on the baffle plates, solving the technical problem of how to stably and accurately dispense catalyst.

Description

Technical Field

[0001] This invention relates to the field of catalyst delivery equipment relying on pneumatic conveying, and more particularly to a baffle-type small particle catalyst delivery equipment. Background Technology

[0002] Solid particle conveying is a problem in fields such as petrochemicals, environmental protection, mining and metallurgy, and power. Generally, solid particle conveying methods include mechanical conveying, pneumatic conveying, and liquid conveying. When conveying solid particles to a closed system, pneumatic conveying and liquid conveying can be used.

[0003] In liquid transport methods, a slurry preparation process is usually required, and slurry is injected into the equipment. This process has disadvantages such as complex procedures, a large number of equipment, high power consumption, severe wear of pumps and motors, short operating cycles, large maintenance workload, and high operating costs. Common equipment used in liquid transport methods includes metering and solenoid valve control. For example, the paper "Design and Implementation of a Multi-channel High-Precision Chemical Dosing Device" introduces a chemical dosing scheme; the paper "Mechanism and Improvement Measures of Chemical Dosing for Methanol Recovery Pretreatment in Changqing Gas Field" describes how frequent flow rate adjustments to the dosing pump in actual production can easily damage the pump, and the flow rate becomes unstable after adjustment.

[0004] In pneumatic conveying systems, fine solid particles are carried by high-speed airflow, and the transport of these particles is never completed. Fluidized beds generally use this method for catalyst addition. Existing technologies use Venturi tubes as the main component. For example, a Venturi tube is installed below the feed pipe. The high-speed airflow creates negative pressure through the throat of the Venturi tube, drawing out the material. However, the specific structure of the Venturi tube has not been improved or mentioned. Although many technicians recognize that the high-speed airflow through the throat of the Venturi tube generates negative pressure that can attract particles and improve system performance, they have not conducted further in-depth research on the Venturi tube. In solving the problem of how to accurately add catalyst, existing technologies mostly use mechanical turntables. However, after a period of use, the gaps between the rotating parts of such mechanical designs will wear and increase, causing small catalyst particles to leak out from the gaps, resulting in excessive catalyst entering the reactor and affecting the normal operation of the reactor.

[0005] Existing catalyst dosing devices fail to address two major problems: First, catalyst blockage in the feed pipe obstructs the flow, preventing the high-speed airflow in the venturi throat from carrying away a measured amount of catalyst, resulting in insufficient catalyst dosing. Second, the gas supply system is unstable, with fluctuating airflow levels, leading to inconsistent catalyst dosing. The harm caused by excessive catalyst dosing is greater than that of insufficient dosing, for the following reasons:

[0006] According to the working principle of a fluidized bed reactor, the catalyst needs to be continuously added to the reactor through a feed pipe. Designers will determine the optimal amount of catalyst to be added based on actual conditions to maximize the efficiency and performance of the fluidized bed reactor. However, in actual production, if the airflow in the catalyst feeding equipment fluctuates (increases or decreases), it will cause fluctuations in the amount and rate of catalyst added, thus affecting the normal operation of the reactor.

[0007] Regarding catalyst injection amount: If the catalyst injection amount is less than the amount required for the unit's designed production capacity, it will reduce the unit's production capacity, but will not affect the product quality; if the catalyst injection amount is too much, exceeding the amount required for the unit's designed production capacity, the heat generated by the polymerization reaction will exceed the heat removal capacity of the reactor's heat exchanger, causing overheating inside the reactor, resulting in agglomeration, clogging of the distribution plate and discharge port, and causing the unit to shut down; in addition, exceeding the designed production capacity will cause the reactor's raw material feeding and powder discharge capacity to be mismatched, making the unit unable to operate. Summary of the Invention

[0008] To address the shortcomings of the existing technology, the purpose of this invention is to provide a baffle-type small particle catalyst dispensing device to solve the technical problem of how to stably and accurately dispense catalyst.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A baffle-type small particle catalyst dosing device includes:

[0011] The catalyst retention device includes a horizontally arranged feed pipe;

[0012] A venturi tube feeding device includes a venturi tube and a storage tube, wherein the upper end of the storage tube is vertically connected to the feeding tube and the lower end of the storage tube is vertically connected to the venturi tube.

[0013] The feature is that the catalyst retention device further includes two or more flow baffles, the upper end of which is fixed to the upper inner wall of the feed pipe, and the lower end is inserted into the storage pipe, and multiple through holes are evenly distributed on the flow baffles.

[0014] The flow baffle is seamlessly welded to the upper inner wall of the feed pipe, and the lower part of the flow baffle is rectangular.

[0015] Furthermore, the plurality of flow-blocking plates are arranged parallel to each other and perpendicular to the feed pipe.

[0016] Furthermore, the multiple flow-blocking plates are parallel to each other, and the flow-blocking plates are at a certain angle to the feed pipe, and are arranged in an inclined distribution.

[0017] Furthermore, the multiple flow deflectors are not parallel to each other, but are arranged at a certain angle, and are set in an angled distribution form.

[0018] The Venturi tube is equipped with a gasbag at the outlet of the storage tube to dynamically adjust the supply of catalyst.

[0019] Furthermore, the storage pipe is divided into three parts from top to bottom: a thick pipe, a reducing pipe, and a thin pipe. The thick pipe is connected to the feeding pipe, and the thin pipe is connected to the Venturi tube.

[0020] The Venturi tube is an insertion type Venturi tube, comprising a first tapered tube and a second tapered tube connected in sequence. The first tapered tube has an extended first straight tube, and the second tapered tube has an extended second straight tube.

[0021] The inner diameter of the second straight tube is smaller than that of the first straight tube so that the second straight tube can be inserted into the first straight tube, and a throat is formed at the connection between the second straight tube and the first straight tube.

[0022] Furthermore, the airbag is located at the throat below the thin tube and connected to the second straight tube, with a through hole in the center of the airbag.

[0023] The airbag is hemispherical.

[0024] Furthermore, the gas volume V in the airbag 气 The area S of the capillary tube after the airbag inflates 阴影 The relationship satisfies an exponential function, and the exponential function is as follows:

[0025]

[0026] Where r is the radius of the airbag, V 气 S represents the volume of gas entering the airbag. 阴影 The area to be blocked is m, which is a constant.

[0027] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0028] 1. This invention provides a baffle-type small particle catalyst dosing device, which uses gas pressure as a power source to achieve the goal of precise catalyst dosing. It solves the technical problem of catalyst blockage in the feed pipe, resulting in poor feed flow, and the inability of the high-speed airflow in the venturi throat to carry away a quantitative amount of catalyst, thus causing insufficient catalyst dosing. It also solves the technical problem of unstable operation of the gas supply section, with the supply airflow being sometimes large and sometimes small, resulting in unstable catalyst dosing. Thus, it ensures stable catalyst dosing and stable various reaction indicators of the fluidized bed.

[0029] 2. The baffle-type small particle catalyst injection equipment provided by this invention has many application scenarios. This catalyst injection method using this equipment is particularly suitable for fluidized bed reactors. It can also be applied at the intersection of two pipes, where the fluid volume in the second pipe is dynamically adjusted by using an airbag.

[0030] 3. The baffle-type small particle catalyst injection device provided by the present invention controls the gas flow rate of the venturi tube to be constant, so that the amount of catalyst blown into the reactor per unit time is determined, thereby simplifying the control indicators and improving the control level of the device. When the gas in the venturi tube fluctuates, the injection device can achieve dynamic adjustment.

[0031] 4. The baffle-type small particle catalyst dosing device provided by the present invention has fewer sealing points because it does not have a reagent sampling and measuring mechanism, thus preventing catalyst leakage and reducing environmental pollution.

[0032] 5. The feeding principle of the baffle-type small particle catalyst feeding device provided by this invention is unique, and it is very convenient to feed the storage pipe. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the filling device structure with vertically arranged baffles, as shown in an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the filling equipment structure with the baffle plate arranged at an angle according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the filling equipment structure with the baffles arranged in an angle according to an embodiment of the present invention;

[0037] Figure 4 for Figure 1 , Figure 2 , Figure 3 A magnified view of the grate section when the airflow in the Chinese-language nozzle of the filling equipment is too large;

[0038] Figure 5 This is a partial enlarged view of the feed pipe and the first baffle plate;

[0039] Figure 6 The graph shows the air intake volume Vair of the airbag versus the shaded area Sshaded.

[0040] in:

[0041] 1-Feeding tube;

[0042] 11-Baffle plate;

[0043] 111 - First baffle plate;

[0044] 112 - Second baffle plate;

[0045] 113 - Third baffle plate;

[0046] 114 - Fourth baffle plate;

[0047] 115 - Fifth baffle plate;

[0048] 116 - Sixth choke plate;

[0049] 117 - Seventh choke plate;

[0050] 118 - Eighth choke plate;

[0051] 119 - Through hole;

[0052] 2-Storage pipe;

[0053] 21-Thick pipe;

[0054] 22-Reducer;

[0055] 23-Thin tube;

[0056] 3-Venturi tube;

[0057] 31-First tapered tube;

[0058] 311 - First Straight Pipe;

[0059] 32 - Second tapered tube;

[0060] 321 - Second straight pipe;

[0061] 33-Throat;

[0062] 4-Airbag. Detailed Implementation

[0063] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims.

[0064] Certain terms are used in this specification and the following claims to refer to specific components or parts. Those skilled in the art will understand that users or manufacturers may use different names or terms to refer to the same component or part. This specification and the following claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout this specification and the following claims are open-ended and should be interpreted as "including but not limited to". Furthermore, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0065] It should be noted that in the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and "about", or "approximately", "substantially", "left and right", etc., indicating the orientation or positional relationship or parameters, are all based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, a specific size, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] This invention provides a baffle-type small particle catalyst dosing device, comprising:

[0067] The catalyst retention device includes a horizontally arranged feed pipe 1; a Venturi tube feed device including a Venturi tube 3 and a storage pipe 2, wherein the upper end of the storage pipe 2 is vertically connected to the feed pipe 1, and the lower end of the storage pipe 2 is vertically connected to the Venturi tube 3; the catalyst retention device also includes two or more baffle plates 11, the upper end of which is fixed to the upper inner wall of the feed pipe 1, and the lower end is inserted into the storage pipe 2, wherein the baffle plate 11 has a plurality of through holes 119 evenly distributed on it. In this embodiment of the invention, the function of the catalyst retention part is to allow the airflow in the feed pipe 1 to pass through and retain the catalyst in the storage pipe 2; wherein, the baffle plate 11 is seamlessly welded to the upper inner wall of the feed pipe 1, the lower part of the baffle plate 11 is rectangular, and the baffle plate 11 has a plurality of small-diameter through holes 119 evenly distributed on it, the number of baffle plates 11 being determined according to the diameter of the through holes and the dust content of the airflow, and the number of baffle plates is greater than or equal to two.

[0068] Specifically, the plurality of flow-blocking plates 11 are arranged parallel to each other and perpendicular to the feed pipe 1, such as... Figure 1As shown, the flow baffle in the filling device provided in this embodiment of the invention may include a first flow baffle 111, a second flow baffle 112 and a third flow baffle 113. The first flow baffle 111, the second flow baffle 112 and the third flow baffle 113 are vertically distributed and welded to the upper inner wall of the feeding pipe.

[0069] Specifically, the plurality of flow-blocking plates are parallel to each other, and the flow-blocking plates form a certain angle with the feed pipe, such as... Figure 2 As shown, the flow baffles in the dispensing device provided in this embodiment of the invention may include a fourth flow baffle 114, a fifth flow baffle 115, and a sixth flow baffle 116, which are arranged in an inclined configuration within the feed pipe 1. This inclined configuration results in more turbulent airflow because the axis of the through-holes on the flow baffles is not parallel to the axis of the feed pipe 1, thus improving catalyst retention compared to the vertical arrangement described above.

[0070] Specifically, the multiple baffles are not parallel, but form a certain angle, such as... Figure 3 The flow baffles in the dispensing device provided in this embodiment of the invention may include a seventh flow baffle 117 and an eighth flow baffle 118, which are arranged at a certain angle. This angled arrangement results in more turbulent airflow because the axis of the through-holes on the flow baffles is not parallel to the axis of the feed pipe 1, and the through-holes on the two flow baffles are staggered. This leads to a more skewed effect on catalyst retention. During use, the better the catalyst retention effect of the flow baffles, the fewer baffles need to be installed, thus saving equipment costs. However, it should be noted that the number of flow baffles must be determined based on actual operating conditions, catalyst particle size, and other parameters, and should be at least two.

[0071] In the venturi tube 3 of the baffle-type small particle catalyst filling device provided in this embodiment of the invention, an airbag 4 is provided at the position opposite to the outlet of the storage tube 2 for dynamically adjusting the supply of catalyst.

[0072] The storage pipe 2 is divided into three parts from top to bottom: a thick pipe 21, a reducing pipe 22, and a thin pipe 23. The thick pipe 21 is connected to the feeding pipe 1, and the thin pipe 23 is connected to the venturi tube 3. Specifically, the venturi tube 3 is an insertion type venturi tube, including a first tapered pipe 31 and a second tapered pipe 32 connected in sequence. The first tapered pipe 31 has an extending first straight pipe 311, and the second tapered pipe 32 has an extending second straight pipe 321. The inner diameter of the second straight pipe 321 is smaller than that of the first straight pipe 311 so that the second straight pipe 321 can be inserted into the first straight pipe 311. A throat 33 is formed at the connection between the second straight pipe 321 and the first straight pipe 311.

[0073] In the baffle-type small particle catalyst dosing device provided in this embodiment of the invention, the feed pipe 1 is connected to the coarse pipe 21, the throat 33 is connected to the fine pipe 23, and the tapered pipe 32 is connected to the throat 33. The connection method can be threaded connection or welding, with threaded connection being preferred. The feed pipe 1 contains an airflow rich in catalyst particles, and the composition of the gas is selected according to the catalyst requirements to ensure that the catalyst is not deactivated. The baffle plate is located above the storage pipe 2, and the baffle plate 11 is welded to the inner wall of the feed pipe 1. The upper part of the baffle plate is seamlessly welded to the feed pipe 1, and the lower part of the baffle plate is rectangular and inserted into the coarse pipe 23.

[0074] In this embodiment of the invention, the airbag 4 is located at the throat 33 below the thin tube 23 and is connected to the second straight tube 321. A through hole is opened in the center of the airbag 4.

[0075] The airbag 4 is hemispherical, and the gas volume V inside the airbag is... 气 The area S of the capillary tube after the airbag inflates 阴影 The relationship satisfies an exponential function, and the exponential function is as follows:

[0076]

[0077] Where r is the radius of the airbag, V 气 S represents the volume of gas entering the airbag. 阴影 The area to be blocked is m, which is a constant.

[0078] In this embodiment of the invention, the thin tube 23 is connected to the thick tube 21 via a reducing tube 22. The particulate catalyst falls into the throat 33 through the thick tube 21, the reducing tube 22, and the thin tube 23, where it is carried away by the high-speed gas flowing through the throat 33 and finally enters the reactor. The gas flow in the Venturi tube 3 originates from the conical tube 32. The composition of the gas flow depends on the catalyst and the internal environment of the reactor, with nitrogen being preferred. The conical tube 32 is connected to the throat 33, and an air bladder 4 is connected to the conical tube 32. The air bladder 4 is located directly below the thin tube 23, and has a central through-hole. The size of the hole is determined based on the rubber material and design requirements. When the airflow meets the design standards, the gas from the conical tube 32 can pass through the through hole with minimal kinetic energy loss. If the airflow from the conical tube 32 is too large, the airbag 4 will expand rapidly due to the wind pressure, gradually blocking the outlet of the thin tube 23, and the amount of catalyst coming out of the thin tube 23 will decrease accordingly. If the airflow from the conical tube 32 is too small, the airbag 4 will collapse, making the outlet of the thin tube 23 larger, and the amount of catalyst coming out of the thin tube 23 will increase, thus keeping the amount of catalyst entering the reactor within the design range.

[0079] In this embodiment of the invention, the airbag 4 is hemispherical, and the gas volume V in the airbag 4 is... 气 The area S of the capillary tube after the airbag inflates 阴影 The relationship satisfies an exponential function, and the exponential function is as follows:

[0080]

[0081] Where r is the radius of the airbag, V 气 S represents the volume of gas entering the airbag. 阴影 The area to be blocked is m, which is a constant.

[0082] This invention utilizes the ability of the airbag 4 to expand and contract with the airflow, thereby changing the size of the outlet of the thin tube section 23. This prevents significant changes in the amount of catalyst blown into the reactor after large airflow variations. It also enables the Venturi tube 3 to dynamically adjust the catalyst supply when the airflow suddenly changes. This design can also be applied in other situations, such as installing the airbag 4 at pipe intersections. If the amount of medium added to pipe A is too large, the airflow to pipe B can be increased, causing the airbag 4 to expand and block the outlet of pipe A. This indirectly reduces the amount of medium added to pipe A, ultimately achieving the goal of adjusting the mixing ratio of the fluid media in pipes A and B, providing a new control method for dynamically adjusting the mixing ratio of media in the dosing equipment.

[0083] In this application, the airbag is hemispherical, with a radius of r and a volume of V. 半球 as follows:

[0084]

[0085]

[0086] After the airbag inflates, it will obstruct the vertically oriented thin tube segment. The obstructed area is the maximum horizontal cross-sectional area of ​​the airbag, and its area is calculated using the following formula:

[0087]

[0088] achievable

[0089] The area covered by the airbag is:

[0090]

[0091] Because the airbag is made of a selected type of rubber with a constant elastic modulus, the expansion volume of the airbag follows a linear law, meaning the ratio of the volume of gas entering the airbag to the volume of the airbag is a constant, specifically:

[0092]

[0093] 0 < k < 1

[0094] From this, we can further conclude that:

[0095]

[0096] If constant

[0097]

[0098] Therefore, we can conclude that:

[0099]

[0100] Consulting a mathematics handbook reveals that it is a variation of a power function (where the independent variable Vi remains constant, and the dependent variable Si... 阴影 (Proportional enlargement or reduction), specifically manifested as:

[0101] When 0 < m < 1, the dependent variable S 阴影 Reduced by a factor of m;

[0102] When m > 1, the dependent variable S 阴影 Magnify by m times.

[0103] Although the curve of the above function changes on the Y-axis, the growth trend of the curve still conforms to the curve pattern of the power function.

[0104] Since 0 < k < 1, then 0 < m < 1.

[0105] In power functions In the middle, the index For x≥0, 0<m<1, we can obtain Figure 3 The curve shown has the X-axis representing the intake air volume (V) and the Y-axis representing the intake air volume (S). 阴影

[0106] τ represents the optimal air intake rate during normal operation of the fluidized bed reactor, at which point the catalyst injection rate is at its optimal level.

[0107] It can be seen that the catalyst Q falling from the (vertical) thin tube section 落 The more, the more it is affected by airflow V 气 The more catalyst is blown into the reactor, the more it affects catalyst Q. 落 The factor is the size of the airbag, that is, the effect of the airbag on the material outlet of the thin tube section.

[0108] Based on the trend of the curve, it can be seen that when V 气 When S becomes smaller 阴影 It will descend rapidly (the airbag contracts rapidly), thus significantly weakening the airbag's shielding effect on the (vertical) capillary segment, further allowing more catalyst to fall from the capillary segment. So, although V 气 The size has decreased, but the amount of catalyst falling from the narrow tube section has increased, thus ensuring that the total amount of catalyst added to the fluidized bed reactor remains stable; achieving the dynamic adjustment function of the injection equipment.

[0109] Based on the growth trend of the curve, it can be seen that when V 气 When S increases, 阴影 Growth is slow (gasbag volume increases slowly); although the gasbag's shielding effect on the (vertical) capillary segment is slightly enhanced (catalyst addition will be slightly reduced), the catalyst drop volume Q... 落 It did not decrease significantly, and its relationship with V 气 The values ​​are roughly the same before the increase. Therefore, although V... 气 The volume has increased considerably, but the amount of catalyst falling from the thinner tube section has not increased significantly, thus ensuring that the total amount of catalyst added to the fluidized bed reactor has not increased substantially.

[0110] Among them, airbag 4 is one of the key innovations of this technical solution, and the specific reasons are as follows:

[0111] During the design phase, designers determine an optimal catalyst dosage based on specific conditions, and also design an optimal air intake τ for the catalyst loading equipment to ensure optimal reactor performance. However, in practical applications, the air intake of the catalyst loading equipment inevitably fluctuates. This necessitates that new catalyst loading equipment possess a certain degree of adjustability to ensure that the catalyst dosage does not fluctuate significantly with changes in airflow (magnitude).

[0112] Based on the above analysis, it can be seen that the change in airbag volume has a power-law relationship with the obstruction of the thin tube feed inlet; specifically, it manifests as follows:

[0113] When the airflow decreases, the volume of the airbag decreases rapidly (the blocking effect weakens quickly), causing a rapid increase in the amount of catalyst falling through the (vertical) capillary tube. This allows for rapid adjustment of the amount of catalyst added, thus ensuring that the overall amount of catalyst added remains stable. Moreover, this type of airbag is highly sensitive to decreases in airflow and has a large adjustment margin.

[0114] When the airflow increases, the volume of the airbag increases slowly (the blocking effect increases slowly), so that the amount of catalyst falling at the (vertical) capillary tube does not increase significantly, thus ensuring that the overall amount of catalyst added tends to be stable.

[0115] The volume change of this gasbag structure follows a power function relationship, which is a key finding of this invention. This gasbag structure is highly sensitive to a decrease in airflow, responding rapidly and providing excellent dynamic regulation; however, it is not sensitive to an increase in airflow, ensuring that the catalyst dosage does not increase indefinitely with increased airflow. This provides a safety guarantee for stable equipment operation and effectively avoids serious reactor malfunctions due to excessive catalyst addition. Because the gasbag only expands slightly when the airflow increases significantly, the amount of catalyst falling remains essentially the same as before; thus cleverly avoiding the problem of excessive catalyst addition in the fluidized bed reactor when the airflow is too high.

[0116] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A baffle-type small particle catalyst dosing device, including: The catalyst retention device includes a horizontally arranged feed pipe; A venturi tube feeding device includes a venturi tube and a storage tube, wherein the upper end of the storage tube is vertically connected to the feeding tube and the lower end of the storage tube is vertically connected to the venturi tube. The feature is that the catalyst retention device further includes two or more flow baffles, the upper end of which is fixedly connected to the inner wall of the upper side of the feed pipe, and the lower end is inserted into the storage pipe, and multiple through holes are evenly distributed on the flow baffles; The multiple flow-blocking plates are not parallel to each other and are arranged at a certain angle, and are set in an angled distribution form. The Venturi tube is equipped with an air bladder at the outlet of the storage tube to dynamically adjust the supply of catalyst. The storage pipe is divided into three parts from top to bottom: a thick pipe, a reducing pipe, and a thin pipe. The thick pipe is connected to the feeding pipe, and the thin pipe is connected to the Venturi tube. The gas volume V in the airbag 气 The area S of the capillary tube after the airbag inflates 阴影 The relationship satisfies an exponential function, and the exponential function is as follows: Where r is the radius of the airbag, V 气 S represents the volume of gas entering the airbag. 阴影 The area to be blocked is m, which is a constant.

2. The baffle-type small particle catalyst dosing device according to claim 1, characterized in that: The flow baffle is seamlessly welded to the upper inner wall of the feed pipe, and the lower part of the flow baffle is rectangular.

3. The baffle-type small particle catalyst dosing device according to claim 1 or 2, characterized in that: The plurality of flow-blocking plates are arranged parallel to each other and perpendicular to the feed pipe.

4. The baffle-type small particle catalyst dosing device according to claim 1 or 2, characterized in that: The multiple flow-blocking plates are parallel to each other, and the flow-blocking plates are at a certain angle to the feed pipe, and are arranged in an inclined distribution.

5. The baffle-type small particle catalyst dosing device according to claim 1, characterized in that: The Venturi tube is an insertion type Venturi tube, comprising a first tapered tube and a second tapered tube connected in sequence, wherein the first tapered tube has an extended first straight tube and the second tapered tube has an extended second straight tube; The inner diameter of the second straight tube is smaller than that of the first straight tube so that the second straight tube can be inserted into the first straight tube, and a throat is formed at the connection between the second straight tube and the first straight tube.

6. The baffle-type small particle catalyst dosing device according to claim 5, characterized in that: The airbag is located at the throat below the thin tube and is connected to the second straight tube. A through hole is opened in the center of the airbag.

7. The baffle-type small particle catalyst dosing device according to claim 1 or 6, characterized in that: The airbag is hemispherical.

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