Uniform gas distribution gas inlet device and reactor comprising same

Abstract

According to the gas inlet device for uniform gas distribution and the reactor comprising the same, the number and position distribution of the first sub-gas inlets in the first gas inlet pipe of the gas inlet device are optimized, and the included angle between the adjacent first sub-gas inlets is gradually reduced along the line from the first total gas inlet to the direction far away from the first total gas inlet; the first sub-air inlets in the large-air-flow area close to the first main air inlet are arranged at large intervals, the air stream action range of the large air flow is expanded, the first sub-air inlets in the small-air-flow area away from the first main air inlet are arranged at small intervals, the air stream action range of the small air flow is reduced, and therefore the air inlet pressure difference of the different first sub-air inlets is reduced; the gas inlet device uniformly distributes gas, so that uniform gas flow can be formed in the reactor provided with the gas inlet device, the physical and chemical reaction effect in the reactor is enhanced, and the working efficiency of the reactor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical reactor equipment, and particularly relates to an air intake device for uniformly distributing gas and a reactor comprising the same. Background Art

[0002] Introducing air flow into the reaction vessel is a common method to promote the diffusion of substances in the reaction vessel and enhance the reaction effect, and the uniformity of the introduced air flow is an important factor in ensuring the enhancement effect. Under normal circumstances, the reaction vessel needs to be equipped with multiple molecular air inlets at the bottom, but the gas generally comes from a single gas source and is transported to the corresponding position through a ring pipe or a branch pipe. During the transportation process, due to differences in distance, position and pipeline direction, there is inevitably a certain pressure loss, resulting in differences in pressure and gas volume at each molecular air inlet, and it is more obvious in large-scale equipment, resulting in the gas phase not being evenly distributed in the reaction vessel, resulting in poor enhancement of the reaction effect. At present, there have been studies on reactors that can evenly distribute gas, but most of them are equipped with uniform air inlets, and the problem of uneven gas distribution caused by the above-mentioned pressure loss is not taken into account.

[0003] For example, CN11369484B discloses a gas-solid fluidized bed reactor with uniform gas distribution, wherein the air inlet distributor includes: an air inlet main pipe, an oblique air inlet pipe, an upward air inlet pipe, an oblique air inlet valve, and an upward air inlet valve. The oblique air inlet pipe and the upward air inlet pipe are both connected to the air inlet main pipe 1, and the upward air inlet pipe is embedded in the oblique air inlet pipe and fixed by welding. The height of the upward air inlet pipe is higher than that of the oblique air inlet pipe. The reactor also requires changes to the shape and structure of the reactor body, and the structure is complex and has low applicability.

[0004] In view of the above situation, the present invention mainly aims at how to obtain an air intake device and a reactor that can evenly distribute air, so as to make the airflow in the reactor more uniform, thereby enhancing the reaction effect and improving the working efficiency of the reactor. Utility Model Content

[0005] In response to the problems existing in the prior art, the purpose of the present invention is to provide an air intake device with uniform gas distribution and a reactor containing the same. By optimizing the number, diameter and position distribution of the neutron air inlets of the air intake device, the air flow rate at different positions in the reactor is changed, so that a more uniform upward airflow is formed in the reactor, thereby enhancing the reaction effect and improving the working efficiency of the reactor.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, the utility model provides an air intake device with uniform air distribution, the air intake device comprising an air intake pipe; the air intake pipe comprising a first air intake pipe, the first air intake pipe comprising a first annular pipe and a first main air inlet arranged at any position around the first annular pipe; the inner wall of the first annular pipe circumferentially extends n non-uniformly distributed first sub-air inlets in a direction away from the outer wall of the first annular pipe, and the first sub-air inlets are symmetrically distributed along the axis of the first main air inlet; around the circumferential direction, from the first main air inlet away from the first main air inlet, the angle between adjacent first sub-air inlets along the line gradually decreases.

[0008] The air intake device for uniform air distribution described in the present invention is configured to extend n non-uniformly distributed first sub-air inlets circumferentially from the inner wall of the first annular tube in a direction away from the outer wall of the first annular tube, and to be designed to surround the circumferential direction, with the angles between adjacent first sub-air inlets along the line gradually decreasing from the first total air inlet away from the first total air inlet, so that in the large air volume area close to the first total air inlet, the first sub-air inlets are spaced apart widely, their positions are more dispersed, and the range of action of the large air streams is expanded; in the small air volume area away from the first total air inlet, the first sub-air inlets are spaced apart relatively closely, their positions are more concentrated, and the range of action of the small air streams is reduced, thereby avoiding the phenomenon that the pressure and air volume of each first sub-air inlet are different due to pressure loss caused by different positions and pipeline directions, thereby achieving uniform air distribution.

[0009] The air intake device for uniform air distribution provided by the utility model has strong applicability and can be installed in various reactors to provide uniform and stable airflow.

[0010] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved.

[0011] Preferably, the position distribution of the first sub-air inlets includes: starting from the first main air inlet, the first sub-air inlets distributed on the same side of the axis of the first main air inlet are numbered 1, 2, 3, 4, ..., x-1 and x in sequence.

[0012] Preferably, with the center of the first annular tube as the center of the circle, the angle between each of the first sub-inlet and the first main inlet is P x =(2x-1)A+(n / 2-x)b, the unit is degrees, where A=360° / 2n, b is the offset angle, x is the number of the first sub-air inlet, and n is the number of the first sub-air inlets.

[0013] Preferably, the offset angle b is 5-20% of A, for example, 5%, 10%, 15% or 20%.

[0014] The present invention further prefers that the offset angle b is 5 to 20% of A, which is beneficial to a smaller intake pressure difference at each first sub-air inlet position and a more uniform air distribution of the air intake device; if the offset angle is small, the air flow uniformity is almost the same as when the first sub-air inlets are evenly set, that is, there is a pressure difference and the air flow is not uniform enough; if the offset angle is large, there is still a pressure difference and the air flow is also uneven.

[0015] Preferably, the number n of the first sub-air inlets is ≥4, for example, it can be 4, 5, 6, 7, 8, 9, 10, 11 or 12.

[0016] Preferably, in the circumferential direction, the diameter of the first sub-air inlet gradually decreases in the direction from the first main air inlet away from the first main air inlet.

[0017] The present invention further prefers that in the circumferential direction, the diameter of the first sub-air inlet gradually decreases from the first main air inlet away from the first main air inlet, and cooperates with the above-mentioned unevenly distributed first sub-air inlets to make the air flow rate close to the first main air inlet larger and the effective range expanded, and the air flow rate away from the first main air inlet smaller and the effective range reduced, thereby reducing the air intake pressure difference at different positions and forming a more uniform airflow in the reactor.

[0018] Optionally, the air intake device further includes at least one second air intake pipe provided on the lower side of the first air intake pipe, for example, there may be one, two or three second air intake pipes.

[0019] Optionally, the air intake device is provided with a second air intake pipe below the first air intake pipe.

[0020] Optionally, the second air intake pipe includes a second annular pipe and a second main air intake port on the second annular pipe.

[0021] Optionally, m evenly distributed second sub-air inlets extend from the inner wall of the second annular tube in a direction away from the outer wall of the second annular tube.

[0022] Preferably, the center lines of the second annular tube coincide with the center lines of the first annular tube.

[0023] Preferably, the number m of the second sub-air inlets is ≥3, for example, it can be 3, 4, 5 or 6.

[0024] Preferably, the diameters of the second sub-air inlets are the same.

[0025] The air intake device for uniform air distribution in the present invention may, according to the actual needs of the reaction, optionally add at least one second air intake pipe on the lower side of the first air intake pipe, and the position distribution of the second sub-air inlet in the second air intake pipe may be arranged in the same manner as the position distribution of the first sub-air inlet according to the actual needs of the reaction, or may be arranged in a traditional uniform distribution manner.

[0026] In a second aspect, the present invention provides a reactor for uniform gas distribution, wherein the reactor is provided with the air intake device for uniform gas distribution as described in the first aspect.

[0027] The uniform gas distribution device in the present invention is provided with the uniform gas distribution air intake device described in the first aspect, so that a uniform upward airflow is formed in the reactor, which is conducive to the full progress of the physical and chemical reaction in the reactor and improves the working efficiency of the reactor.

[0028] Preferably, the air inlet device is arranged in a reactor, and the reactor comprises a cylinder and a feed pipe.

[0029] Preferably, the feed pipe is arranged on the upper side of the first annular pipe.

[0030] Preferably, the length of the first sub-air inlet from the inner wall of the cylinder is 5-50% of the radius of the cylinder, for example, it can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%.

[0031] Preferably, the height h1 of the first annular tube from the bottom of the cylinder accounts for 10-20% of the total height h of the cylinder, for example, 10%, 12%, 15%, 18%, or 20%. Preferably, the distance between the second sub-air inlet and the inner wall of the cylinder accounts for 60-80% of the radius of the cylinder, for example, 60%, 65%, 70%, 75%, or 80%.

[0032] Preferably, the height h2 of the second annular tube from the bottom of the cylinder accounts for 5-15% of the total height h of the cylinder, for example, 5%, 8%, 10%, 12%, or 15%. The reactor with uniform gas distribution provided by the present invention optimizes the distances of the first and second sub-inlets from the inner wall of the cylinder, with the first sub-inlet closer to the inner wall and the second sub-inlet closer to the center of the cylinder; and simultaneously optimizes the heights of the first and second annular tubes, thereby making the overall airflow in the reactor more uniform and more conducive to the progress of physical and chemical reactions.

[0033] The numerical range described in the present invention includes not only the point values ​​listed above, but also any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0034] The following is a detailed description of the method for using the air intake device and the reactor provided by the present invention.

[0035] Taking the air intake device in which a second air intake pipe is provided at the lower side of the first annular tube as an example, according to the gas phase flow rate required for the reaction, the number of first sub-air inlets of the first annular tube and their position distribution are selected, and whether to set a second annular tube and the number of second sub-air inlets of the second annular tube and their position distribution are selected. Then, the first air intake pipe and the second air intake pipe in the air intake device are installed on the cylinder. According to the gas phase introduction direction required for the reaction, the installation height position of the first air intake pipe and the second air intake pipe is selected. Then, according to the gas phase flow rate required for the reaction, the gas introduction flow rate and flow velocity of the first total air inlet and the second total air inlet are adjusted, so as to achieve uniform gas distribution of the air intake device, form a uniform and stable airflow in the reactor, and enhance the physical and chemical reaction effect in the reactor.

[0036] The uniform gas distribution air inlet device provided by the present invention is suitable for various cylindrical reactors, and the provided uniform gas distribution reactor is suitable for various reactions requiring stable airflow, including processes in which gas is used as a raw material to participate in the reaction, such as CO2 and SO2 replenishment, or in which gas is only used to enhance diffusion, such as liquid-liquid extraction and separation.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) The utility model provides an air intake device for uniform air distribution, which provides n non-uniformly distributed first sub-air inlets in the air intake pipe and adjusts the direction from the first main air inlet away from the first main air inlet so that the angles between adjacent first sub-air inlets along the line gradually decrease, so that the intervals between the first sub-air inlets in the large air volume area close to the first main air inlet increase, thereby expanding the scope of action of the large air volume gas streams, and the intervals between the first sub-air inlets in the small air volume area away from the first main air inlet decrease, thereby reducing the scope of action of the small air volume gas streams, thereby achieving more uniform air distribution, and the said device for uniform air distribution has a wide range of application and can be applied to various types of cylindrical reactors.

[0039] (2) The present invention provides a reactor with uniform gas distribution, which realizes the uniformity of the overall air flow inside the reactor by setting the air intake device for uniform gas distribution described in the first aspect and adjusting the position of the air intake device in the cylinder and the length of the first sub-air inlet and the second sub-air inlet in the air intake device from the center of the reactor, which is more conducive to the progress of physical and chemical reactions in the reactor and improves the working efficiency of the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1This is a schematic diagram of the structure of the first air intake pipe and the position distribution of the first sub-air intake port in the air intake device for uniform air distribution provided in Example 1 of the present invention; wherein x represents the number of the first sub-air intake port, P x represents the angle between the first sub-inlet numbered x and the line along the first main air inlet;

[0041] Figure 2 This is a schematic structural diagram of a reactor for uniform gas distribution provided in Example 1 of the present invention;

[0042] Explanation of the accompanying reference numerals: 1. First air inlet pipe; 11. First annular pipe; 12. First main air inlet; 13. First sub-air inlet; 2. Cylinder; 3. Feed pipe. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0044] It should be understood that in the description of the present invention, the terms "upper," "lower," "inner," "outer," "bottom," "top," "horizontal," and "center" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are used solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Terms such as "first" and "second" do not indicate the importance of components and therefore should not be construed as limiting the present invention. The specific dimensions used in this embodiment are intended only to illustrate the technical solution and do not limit the scope of protection of the present invention.

[0045] 1. Implementation

[0046] Example 1

[0047] This embodiment provides an air intake device for uniformly distributing air, the air intake device comprising an air intake pipe;

[0048] like Figure 1 As shown, the air intake pipe includes a first air intake pipe 1, which includes a first annular pipe 11 and a first main air intake port 12 provided at any position around the first annular pipe 11; the inner wall of the first annular pipe 11 extends circumferentially to form eight non-uniformly distributed first sub-air intake ports 13 in a direction away from the outer wall of the first annular pipe 11, and the first sub-air intake ports 13 are symmetrically distributed along the axis of the first main air intake port 12;

[0049] In the circumferential direction, from the first main air inlet 12 away from the first main air inlet 12 , the angle between adjacent first sub-air inlets 13 along the line gradually decreases, and the diameter of the first sub-air inlet 13 gradually decreases;

[0050] Taking the first main air inlet 12 as the starting point, the first sub-air inlets 13 distributed on the same side of the axis of the main air inlet are numbered 1, 2, 3 and 4 in sequence; with the center of the first annular tube 11 as the center of the circle, the angle between each of the first sub-air inlets 13 and the line along the first main air inlet 12 is Px = (2x-1)A + (n / 2-x)b, in degrees, where A = 360° / 2n, b is 10% of A, x is the number of the first sub-air inlet 13, and n is 8. Then, the angles between the first sub-air inlets 13 numbered 1, 2, 3 and 4 and the line along the first main air inlet 12 are 29.25°, 72°, 114.75° and 157.5°, respectively; the diameters of the first sub-air inlets 13 numbered 1, 2, 3 and 4 are 20 mm, 18 mm, 16 mm and 15 mm, respectively;

[0051] This embodiment also provides a reactor for uniform gas distribution, such as Figure 2 As shown, the air inlet device is arranged in the reactor, and the reactor comprises a cylinder 2 and a feed pipe 3; the cylinder 2 has a diameter of 3m and a height of 10m;

[0052] The distance between the first sub-air inlet 13 and the inner wall of the cylinder 2 is 10% of the radius of the cylinder 2, which is 15 cm; the height h1 of the first annular tube 11 from the bottom of the cylinder 2 is 10% of the total height h of the cylinder 2, which is 1 m.

[0053] The uniform gas distribution provided in this embodiment provides highly uniform gas flow in the reactor.

[0054] Example 2

[0055] This embodiment provides an air intake device for uniformly distributing air, the air intake device comprising an air intake pipe;

[0056] The air intake pipe includes a first air intake pipe, the first air intake pipe including a first annular pipe and a first main air intake port provided at any position around the first annular pipe; the inner wall of the first annular pipe extends circumferentially away from the outer wall of the first annular pipe to form 12 unevenly distributed first sub-air intake ports, and the first sub-air intake ports are symmetrically distributed along the axis of the first main air intake port;

[0057] In the circumferential direction, from the first main air inlet away from the first main air inlet, the angle between adjacent first sub-air inlets along the line gradually decreases, and the diameter of the first sub-air inlet gradually decreases;

[0058] Taking the first main air inlet as the starting point, the first sub-air inlets distributed on the same side of the axis of the main air inlet are numbered 1, 2, 3, 4, 5 and 6 in sequence; taking the center of the first annular tube as the center of the circle, the angle between each of the first sub-air inlets and the line along the first main air inlet is Px = (2x-1)A + (n / 2-x)b, in degrees, where A = 360° / 2n, b is 5% of A, x is the number of the first sub-air inlet, and n is 12. Then the angles between the first sub-air inlets numbered 1, 2, 3, 4, 5 and 6 and the line along the first main air inlet are 18.75°, 48°, 77.25°, 106.5°, 135.75° and 165° respectively; the diameters of the first sub-air inlets numbered 1, 2, 3, 4, 5 and 6 are 20 mm, 19 mm, 18 mm, 17 mm, 16 mm and 15 mm respectively;

[0059] The air intake device is provided with a second air intake pipe on the lower side of the first air intake pipe; the second air intake pipe includes a second annular pipe and a second main air intake port on the second annular pipe; the inner wall of the second annular pipe extends into 6 evenly distributed second sub-air intake ports away from the outer wall of the second annular pipe; the center lines of the second annular pipe and the first annular pipe coincide; the diameter of each of the second sub-air intake ports is the same, which is 18 mm.

[0060] This embodiment also provides a reactor for uniform gas distribution, wherein the gas inlet device is arranged in the reactor, and the reactor comprises a cylinder and a feed pipe; the cylinder has a diameter of 3m and a height of 10m;

[0061] The length of the first sub-air inlet from the inner wall of the cylinder accounts for 20% of the radius of the cylinder, which is 30 cm; the distance of the second sub-air inlet from the inner wall of the cylinder accounts for 80% of the radius of the cylinder, which is 120 cm; the height h1 of the first annular tube from the bottom of the cylinder accounts for 20% of the total height h of the cylinder, which is 2 m; the height h2 of the second annular tube from the bottom of the cylinder accounts for 15% of the total height h of the cylinder, which is 1.5 m.

[0062] The gas flow in the reactor with uniform gas distribution provided in this embodiment is highly uniform, and the degree of uniformity is comparable to that in Example 1.

[0063] Example 3

[0064] This embodiment provides an air intake device, wherein the angle P is the angle between each of the first sub-air inlets and the first main air inlet. x =(2x-1)A+(n / 2-x)b, where b is 30% of A, the rest are the same as in Example 1.

[0065] This embodiment provides a reactor, which is the same as that of Embodiment 1 except that it is provided with the air inlet device provided in this embodiment.

[0066] Since the position of each first sub-air inlet in the air intake device provided in this embodiment is offset to a large extent in the direction away from the first total air inlet, the effective range of the large air volume area close to the first total air inlet is too large, and the effective range of the small air volume area away from the first total air inlet is too small. There is still a pressure difference between the two, resulting in poor air distribution uniformity of the air intake device. Compared with Example 1, the overall air flow uniformity in the reactor is poor.

[0067] 2. Comparative Example

[0068] Comparative Example 1

[0069] This comparative example provides an air intake device, which is the same as that of Example 1 except that the first sub-air inlets are evenly distributed.

[0070] This comparative example also provides a reactor, which is equipped with the air inlet device provided in this comparative example, and the rest is the same as Example 1.

[0071] Due to the uniform distribution of the first sub-air inlet in the air intake device provided in this comparative example, the air flow range of the large air volume area close to the first total air inlet and the small air volume area far away from the first total air inlet is the same. The influence of the pressure difference caused by the different positions of different sub-air inlets on the uniformity of the air flow is not taken into account, resulting in poor air flow uniformity in the reactor, which is not conducive to physical and chemical reactions.

[0072] Comparative Example 2

[0073] This comparative example provides an air intake device, wherein the angle between each of the first sub-air inlets and the first main air inlet is P x =(2x-1)A+(n / 2-x)b replaced by P x =(2x-1)A-(n / 2-x)b, the rest are the same as in Example 1.

[0074] This comparative example provides a reactor, which is the same as Example 1 except that it is provided with an air inlet device provided in this comparative example.

[0075] Since the central angle P between each of the first sub-inlet ports and the first main inlet port in the air intake device provided in this comparative example is x=(2x-1)A-(n / 2-x)b, that is, the position distribution of the first sub-air inlet is shifted toward the first total air inlet, that is, the first sub-air inlets in the large air volume area close to the first total air inlet are closely spaced and the distribution is more concentrated, while the first sub-air inlets in the small air volume area far away from the second total air inlet are widely spaced and the distribution is more dispersed, resulting in a smaller range of action of the gas stream in the large air volume area and a larger range of action of the gas stream in the small air volume area, which leads to greater differences in the air inlet pressures at different positions of the reactor and uneven airflow distribution in the reactor.

[0076] In summary, the uniformly distributed gas intake device and the reactor containing the same provided by the present invention optimize the position distribution and diameter size of the first sub-air inlet in the air intake device, so that the gas flow in the large gas volume area close to the first total air inlet has a larger range of action, and the gas flow in the small gas volume area far away from the first total air inlet has a smaller range of action, and the pressure difference between the two is reduced. The height of the position of the air intake device on the cylinder and the distance between its sub-air inlet and the center of the cylinder are optimized, so that the overall airflow in the reactor is more uniform, which is beneficial to enhancing the physical and chemical reaction effect in the reactor.

[0077] The applicant declares that while the above-described embodiments illustrate the detailed structural features of the present invention, the present invention is not limited to these detailed structural features, nor does it imply that the present invention must rely on these detailed structural features in order to be implemented. Persons skilled in the art should understand that any improvements to the present invention, equivalent replacements for selected components, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. An air intake device for uniform air distribution, characterized in that: The air intake device includes an air intake pipe; The air intake pipe includes a first air intake pipe, the first air intake pipe including a first annular pipe and a first main air intake port provided at any position around the first annular pipe; n non-uniformly distributed first sub-air intake ports are circumferentially extended from an inner wall of the first annular pipe in a direction away from an outer wall of the first annular pipe, and the first sub-air intake ports are symmetrically distributed along an axis of the first main air intake port; Around the circumferential direction, in a direction from the first main air inlet away from the first main air inlet, the angle between adjacent first sub-air inlets along the line gradually decreases.

2. The air intake device for uniform air distribution according to claim 1, characterized in that: The position distribution of the first sub-air inlets includes: starting from the first main air inlet, the first sub-air inlets distributed on the same side of the axis of the first main air inlet are numbered 1, 2, 3, 4, ..., x-1 and x in sequence; With the center of the first annular tube as the center of the circle, the angle between each of the first sub-inlet and the first main inlet is P x =(2x-1)A+(n / 2-x)b, in degrees, where A=360° / 2n, b is the offset angle, x is the number of the first sub-inlet, and n is the number of the first sub-inlet; The offset angle b is 5 to 20% of A; The number n of the first sub-air inlets is ≥4.

3. The air intake device for uniform air distribution according to claim 1, characterized in that: In the circumferential direction, the diameter of the first sub-air inlet gradually decreases from the first main air inlet away from the first main air inlet.

4. A reactor for uniform gas distribution, characterized in that: The reactor for uniform gas distribution is provided with an air inlet device for uniform gas distribution as claimed in any one of claims 1 to 3.

5. The reactor for uniform gas distribution according to claim 4, characterized in that: The air inlet device is arranged in a reactor, and the reactor comprises a cylinder and a feed pipe.

6. The reactor for uniform gas distribution according to claim 5, characterized in that: The distance between the first sub-air inlet and the inner wall of the cylinder is 5-50% of the radius of the cylinder.

7. The reactor for uniform gas distribution according to claim 5, characterized in that: The height h1 of the first annular tube from the bottom of the cylinder accounts for 10-20% of the total height h of the cylinder.

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