Air distribution plate and hydrocyanic acid reactor comprising same

Abstract

The utility model relates to an air distribution plate and a hydrocyanic acid reactor comprising the same, and belongs to the technical field of chemical equipment. The air distribution plate comprises a horizontally mounted distribution plate main body, an air distribution pipe vertically embedded in the distribution plate main body, and an inner wall supporting structure for connecting the distribution plate main body and the inner wall of the reactor, and the supporting beam structure is used for supporting the bottom of the distribution plate main body. The supporting beam structure is specifically an H-shaped steel supporting beam or a polygonal structure supporting beam. Compared with the prior art, the air distribution plate disclosed by the utility model can be used for spraying air in the vertical direction and uniformly diffusing the air, so that the air is more fully mixed with feed gas, a catalyst is fully fluidized, and the product conversion rate and the reactor performance are improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to an air distribution plate and a hydrogen cyanide reactor containing the distribution plate. Background Technology

[0002] Hydrogen cyanide, also known as formonitrile or hydrogen cyanide, is mainly produced industrially using the Angle process, and the hydrogen cyanide reactor is the core device in the hydrogen cyanide production process. In currently used hydrogen cyanide reactors, some air distribution plates have covered, non-axial air distribution pipes, resulting in horizontal airflow after the distribution pipe. This horizontal airflow easily causes the catalyst in the counter-fluidized state to settle on the cover after passing through the air distribution pipe, resulting in insufficient mixing of air and feed gas, which in turn leads to a decrease in product conversion rate and reactor performance. In addition, dead zones exist in catalyst fluidization, which can easily cause local overheating of the catalyst. Overheating can damage any nearby fluidized catalyst, such as calcining the surface of any nearby fluidized catalyst, thereby reducing the reaction surface area and catalyst activity. In severe cases, it may damage all the fluidized bed catalyst charge in the reactor.

[0003] Meanwhile, hydrogen cyanide reactors typically operate within a temperature range of 400-500℃. However, these reactors undergo periodic start-ups and shutdowns, routine maintenance, catalyst replacement, and emergency shutdowns. When the reactor transitions between ambient and normal operating temperatures, the internal temperature fluctuation can reach as high as 400-500℃. This temperature cycling between low and high temperatures can generate significant thermal stress on the reactor's structural components, especially between the air distribution plate and the reactor's inner wall. Because the inherent expansion and contraction of these structural components respond to temperature changes, the thermal deformation caused by these stresses accumulates over time, leading to mechanical failure, particularly at welded joints.

[0004] Furthermore, as the scale of chemical plants increases, the specifications of reactors are also enlarging, and the dimensions of their internal components also increase accordingly. For large-span air distribution plate support structures that bear heavy loads and significant deflection, using solid web plate support beams in the form of I-beams or H-beams not only results in heavy beams themselves but also hinders the rapid and uniform distribution of air between beams, thus affecting the uniform diffusion of air in the air distribution pipes.

[0005] The aforementioned problems all affect the thorough mixing of air with the methanol and ammonia feed gases above, thus impacting the conversion rate of hydrogen cyanide and the overall performance of the reactor. Therefore, to address the issues with the air distribution plate in the hydrogen cyanide reactor, a novel air distribution plate suitable for hydrogen cyanide reactors still needs to be developed. Utility Model Content

[0006] The purpose of this invention is to overcome the defects of the prior art by providing an air distribution plate and a hydrogen cyanide reactor containing the distribution plate.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] This utility model first provides an air distribution plate, installed inside a hydrogen cyanide reactor, the air distribution plate comprising:

[0009] The main body of the horizontally installed distribution plate;

[0010] An air distribution pipe is vertically embedded in the main body of the distribution plate; the air distribution pipe includes a vertically connected and vertically continuous section of equal diameter and a concentric section of different diameter, the top of the vertically connected section of equal diameter is unobstructed, and the concentric section of different diameter is located at the lower end of the vertically connected section of equal diameter and its diameter converges downward.

[0011] Inner wall support structure used to connect the main body of the distribution plate to the inner wall of the reactor;

[0012] And, a support beam structure for supporting the bottom of the main body of the distribution plate; the top of the support beam structure is fitted into the reinforcing rib plate inside the reactor, and the bottom of the support beam structure is installed on the reinforcing rib plate inside the reactor;

[0013] The supporting beam structure is specifically one of the following structures:

[0014] The H-beam support beam has multiple air circulation holes on its web.

[0015] A polygonal support beam includes an upper support plate, a lower support plate, and connecting rods that connect the upper and lower support plates. The connecting rods are arranged to form a continuous polygonal unit.

[0016] Furthermore, the axis of the air distribution pipe is parallel to the central axis of the reactor.

[0017] Furthermore, the air distribution pipes are evenly distributed on the main body of the distribution plate.

[0018] Furthermore, the inner wall support structure is preferably a support angle steel.

[0019] Furthermore, the supporting angle steel includes an integrally connected vertical section and a horizontal section, wherein the vertical section is connected to the inner wall of the reactor, and the horizontal section has a circular hole and is connected to the main body of the distribution plate through a threaded fastener.

[0020] Furthermore, the main body of the distribution plate is provided with radially elongated holes evenly distributed along the circumference to compensate for the radial expansion difference between the main body of the distribution plate and the inner wall of the reactor.

[0021] Furthermore, the reinforcing rib plate is provided with a T-shaped groove.

[0022] Furthermore, the upper end of the H-shaped steel support beam or the upper support plate of the polygonal structure support beam is engaged in the slot of the reinforcing rib plate, and a pad is provided between the pad and the bottom surface of the distribution plate body.

[0023] Furthermore, the connecting rod of the web of the H-beam support beam or the polygonal structure support beam extends downward from the slot.

[0024] Furthermore, a pad is provided between the lower end of the H-beam support beam or the lower support plate of the polygonal structure support beam and the support stiffener plate, and a fastening connection is achieved by threaded fasteners.

[0025] Furthermore, multiple air vents are provided at equal intervals along the centerline of the web.

[0026] Furthermore, the shape of the air circulation hole is any one of the following: triangle, square, rhombus, hexagon, circle, and ellipse.

[0027] Furthermore, the connecting rods are inclined, and the inclination directions of adjacent connecting rods are opposite, so that adjacent connecting rods form polygonal units with the shape of isosceles triangles or isosceles trapezoids.

[0028] This utility model also provides a hydrogen cyanide reactor, which includes an air distribution plate as described in any of the above claims, and a raw material gas distributor located above the air distribution plate.

[0029] Furthermore, a fluidization space is formed between the air distribution plate and the feed gas distributor to allow air and feed gas to mix and fully contact the catalyst.

[0030] Furthermore, the raw material gas distributor is provided with a number of nozzles, and the nozzles are arranged in a one-to-one correspondence with the air distribution pipes on the air distribution plate.

[0031] Compared with the prior art, the present invention has the following technical advantages:

[0032] (1) The air distribution pipe of this utility model has no obstruction at the top and the bottom diameter tapers downward, which allows the air to be sprayed upward without obstruction and form a strong and uniform turbulent mixture with the raw material gas from top to bottom, thereby minimizing the catalyst fluidization dead zone and improving the reaction performance. In addition, the distribution plate of this utility model is also stably installed through the inner wall support structure and various forms of support beams, ensuring the structural stability under high temperature and airflow impact.

[0033] (2) The air distribution plate of this utility model avoids the local low-speed zone or obstruction that may be formed by the top cover, effectively prevents the catalyst particles from settling and accumulating near the distribution pipe opening, promotes the catalyst in the entire bed at the bottom of the reactor to be in a good fluidization state, further avoids local overheating or sintering, and also prevents deactivation caused by long-term quiescence, so that the air and the raw material gas (such as ammonia, methane, etc.) and catalyst particles are in more sufficient contact and the reaction is more complete, which is conducive to improving the conversion rate of hydrogen cyanide and improving the overall performance of the reactor.

[0034] (3) The air distribution plate of this utility model has several radial elongated holes to compensate for the radial thermal deformation of the main body of the distribution plate and the inner wall of the reactor caused by temperature changes. This can effectively avoid mechanical failure caused by thermal stress, ensure safe operation of the reactor, improve the service life of the equipment, and reduce the risk of accidents.

[0035] (4) The H-beam support beam of this utility model has multiple air passage holes on its web, allowing some air to pass through, avoiding the formation of a large airflow blind zone below the support beam, and contributing to the uniform distribution of the overall airflow at the bottom of the reactor. The polygonal structure support beam forms a stable structure through polygonal units formed by interlaced connecting rods, and also has a certain guiding and redistribution effect on the airflow passing through it. Both the H-beam support beam and the polygonal structure support beam have the characteristics of being lightweight and having high load-bearing capacity, and can withstand larger spans and loads. This not only reduces the self-weight of the structure, but also facilitates the rapid and uniform distribution of air between the beams, thereby promoting the uniform diffusion of air flowing through the air distribution pipe.

[0036] (5) Through precise fluid dynamics and structural design, this utility model achieves a highly uniform distribution of air within the reactor, completely eliminating the fluidization dead zone of the catalyst, thereby ensuring the efficient and stable fluidization state of the catalyst. In addition, the one-to-one matching arrangement of the raw material gas nozzle and the air distribution pipe allows for more thorough mixing of air and raw material gas, greatly improving the product conversion rate and reactor performance, and providing an efficient, reliable, and energy-saving solution for the industrial synthesis reaction of hydrogen cyanide. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the air distribution plate in Embodiment 1 of this utility model.

[0038] Figure 2 This is a cross-sectional view of the main body of the distribution plate in Embodiment 1 of this utility model.

[0039] Figure 3 This is a schematic diagram of the H-shaped steel support beam in Embodiment 1 of this utility model.

[0040] Figure 4 This is a schematic diagram of the air distribution plate in Embodiment 2 of this utility model.

[0041] Figure 5 This is a schematic diagram of the polygonal support beam in Embodiment 2 of this utility model.

[0042] Figure 6 This is a partial structural schematic diagram of the hydrogen cyanide reactor in Embodiment 3 of this utility model.

[0043] Explanation of markings in the diagram:

[0044] 1-Distribution plate body, 11-Radial oblong hole;

[0045] 2-Air distribution pipe, 21-Vertical equal diameter section, 22-Concentric unequal diameter section,

[0046] 3-Inner wall support structure;

[0047] 4- H-beam support beam, 41- web, 42- air vent;

[0048] 5-Polygonal structure support beam, 51-Upper support plate, 52-Lower support plate, 53-Connecting rod;

[0049] 6-Reactor, 61-Reinforcing rib, 611-Slot, 62-Supporting rib;

[0050] 7-Plate;

[0051] 8-Raw material gas distributor, 81-Nozzle. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0053] In this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0054] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0055] The first aspect of this utility model provides an air distribution plate installed inside a hydrogen cyanide reactor. The air distribution plate includes a horizontally installed distribution plate body 1, an air distribution pipe 2 vertically embedded in the distribution plate body 1, an inner wall support structure 3 for connecting the distribution plate body 1 to the inner wall of the reactor 6, and a support beam structure for supporting the bottom of the distribution plate body 1.

[0056] The air distribution pipe 2 includes an integrally connected, vertically continuous equal-diameter section 21 and a concentric unequal-diameter section 22. The top of the vertically continuous equal-diameter section 21 is unobstructed, while the concentric unequal-diameter section 22 is located at the lower end of the vertically continuous equal-diameter section 21 and its diameter converges downwards. The purpose of the unobstructed structure is to ensure thorough mixing of air and feed gas, preventing catalyst from settling onto the obstruction cover, reducing the catalyst fluidization dead zone, promoting full catalyst fluidization, improving product conversion rate and reactor performance, while not reducing catalyst activation performance and saving catalyst.

[0057] The top of the support beam structure is fitted into the reinforcing rib plate 61 inside the reactor 6, and the bottom of the support beam structure is installed on the supporting rib plate 62 inside the reactor 6. Specifically, the support beam structure can be either an H-beam support beam 4 or a polygonal support beam 5. The H-beam support beam 4 has multiple air circulation holes 42 on its web 41. The polygonal support beam 5 includes an upper support plate 51, a lower support plate 52, and connecting rods 53 connecting the upper support plate 51 and the lower support plate 52. The connecting rods 53 are arranged to form continuous polygonal units.

[0058] In some specific embodiments, the axis of the air distribution pipe 2 is parallel to the central axis of the reactor 6.

[0059] In some specific embodiments, the air distribution pipes 2 are evenly distributed on the distribution plate body 1.

[0060] In some specific embodiments, the distance between the axes of adjacent air distribution pipes 2 is 150-400 mm, more preferably 200-300 mm.

[0061] In some specific embodiments, the diameter of the vertical equal diameter section 21 is DN20~DN50, and more preferably DN25~DN40.

[0062] In some specific embodiments, the diameter of the lowermost end of the concentric segment 22 is 0.1-0.6 times the diameter of the upper end, preferably 0.2-0.4 times.

[0063] In some specific embodiments, the inner wall support structure 3 is preferably a support angle steel.

[0064] In some specific embodiments, the supporting angle steel includes an integrally connected vertical section and a horizontal section, wherein the vertical section is connected to the inner wall of the reactor 6, and the horizontal section has a circular hole and is connected to the distribution plate body 1 through a threaded fastener.

[0065] In some specific embodiments, radial elongated holes 11 are uniformly opened along the circumference of the distribution plate body 1 to compensate for the radial expansion difference between the distribution plate body 1 and the inner wall of the reactor 6.

[0066] In some specific embodiments, the reinforcing rib plate 61 has a T-shaped groove 611.

[0067] In some specific embodiments, the upper end of the H-shaped steel support beam 4 or the upper support plate 51 of the polygonal structure support beam 5 is engaged in the slot 611 of the reinforcing rib plate 61, and a pad 7 is provided between the upper end of the H-shaped steel support beam 4 and the bottom surface of the distribution plate body 1.

[0068] In some specific embodiments, the web 41 of the H-beam support beam 4 or the connecting rod 53 of the polygonal structure support beam 5 extends downward from the slot 611.

[0069] In some specific embodiments, a pad 7 is provided between the lower end of the H-beam support beam 4 or the lower support plate 52 of the polygonal structure support beam 5 and the support stiffener plate 62, and a fastening connection is achieved by threaded fasteners.

[0070] In some specific embodiments, the spacing of the H-beam support beams 4 is 200-800mm, more preferably 400-600mm.

[0071] In some specific embodiments, the air circulation holes 42 are provided at equal intervals along the center line of the web 41.

[0072] In some more specific embodiments, the center-to-center spacing of the air circulation holes 42 is 150-450 mm, more preferably 300-400 mm.

[0073] In some specific embodiments, the shape of the air passage 42 is any one of triangle, square, rhombus, hexagon, circle, or ellipse.

[0074] In some specific embodiments, the connecting rod 53 is inclined and the inclination directions of adjacent connecting rods 53 are opposite, so that adjacent connecting rods 53 form polygonal units in the shape of isosceles triangles or isosceles trapezoids.

[0075] In some specific embodiments, the connecting rod 53 is an angle steel or a steel pipe.

[0076] A second aspect of this invention provides a hydrogen cyanide reactor. The hydrogen cyanide reactor includes an air distribution plate and a feed gas distributor 8 located above the air distribution plate.

[0077] In some specific embodiments, a fluidization space is formed between the air distribution plate and the raw material gas distributor 8 for mixing air and raw material gas and for full contact with the catalyst.

[0078] In some specific embodiments, the raw material gas distributor 8 is provided with a plurality of nozzles 81, and the nozzles 81 are arranged one-to-one with the air distribution pipes 2 on the air distribution plate. The air distribution pipes 2 in the hydrogen cyanide reactor are arranged one-to-one with the raw material gas nozzles 81, which promotes the rapid and thorough mixing of air and raw material gas, so that the catalyst can be completely fluidized by the mixed gas.

[0079] Each of the above embodiments can be implemented individually, or in any combination of two or more. The following detailed description of specific examples will further illustrate these embodiments.

[0080] Example 1:

[0081] This embodiment provides an air distribution plate suitable for a hydrogen cyanide reactor. For example... Figure 1 As shown, the air distribution plate is horizontally installed inside the hydrogen cyanide reactor, specifically including the distribution plate body 1, air distribution pipe 2, inner wall support structure 3, and support beam structure.

[0082] Figure 2 The lower semicircle is the overall top view of the main body 1 of the distribution plate. Figure 2 The upper semicircle is a schematic diagram of the bottom support of the main body 1 of the distribution plate. Figure 2 As can be seen, in this embodiment, radial elongated holes 11 are uniformly formed along the circumference of the distribution plate body 1. These holes are used to compensate for radial thermal deformation of the distribution plate body 1 and the inner wall of the reactor 6 caused by temperature changes. This effectively avoids mechanical failure caused by thermal stress, ensures safe operation of the reactor, improves equipment service life, and reduces the risk of accidents. In this embodiment, the width of the radial elongated hole 11 is W = d + 2c, where d is the bolt diameter and c is the clearance on one side, typically 1mm to 1.5mm. The length of the radial elongated hole 11 is L = W + 2e, where e is the maximum designed radial displacement, e = 2 to 4mm.

[0083] In this embodiment, the air distribution pipe 2 is uniformly embedded vertically into the horizontally installed distribution plate body 1, and the axis of the air distribution pipe 2 is parallel to the central axis of the reactor 6. The distance between the axes of adjacent air distribution pipes 2 is approximately 250 mm.

[0084] In this embodiment, the air distribution pipe 2 includes a vertically connected, uniformly sized section 21 and a concentrically sized section 22. The top of the uniformly sized section 21 is unobstructed, and the concentrically sized section 22 is located at the lower end of the uniformly sized section 21 with its diameter converging downwards. Air enters from the lower concentrically sized section 22 and exits upwards from the top of the uniformly sized section 21. The diameter of the uniformly sized section 21 is DN30, and the diameter of the lowermost end of the concentrically sized section 22 is approximately 0.2-0.4 times the diameter of the upper end. This embodiment innovatively sets the air distribution pipe 2 into a segmented structure with a "small inlet and large outlet." The small outlet throttles the air, reducing pressure drop and increasing kinetic energy, while the large outlet diffuses the kinetic energy, converting it into static pressure and reducing velocity. This not only prevents clogging and backflow into the air distribution pipe but also provides a stable pressure drop, protects the bed material, and ensures uniform airflow.

[0085] In this embodiment, the inner wall support structure 3 is used to connect the distribution plate body 1 and the inner wall of the reactor 6. The inner wall support structure 3 is preferably a support angle steel. The support angle steel includes an integrally connected vertical section and a horizontal section. The vertical section is welded to the inner wall of the reactor 6, and the horizontal section has a circular hole and is fastened to the distribution plate body 1 by threaded fasteners (including conventional studs, nuts, washers, etc.).

[0086] In this embodiment, the support beam structure is used to support the bottom of the distribution plate body 1. The top of the support beam structure is fitted into the reinforcing rib plate 61 inside the reactor 6, and the bottom of the support beam structure is installed on the support rib plate 62 inside the reactor 6. The reinforcing rib plate 61 has a T-shaped groove 611.

[0087] In this embodiment, an H-beam support beam 4 is used as the support beam structure. Multiple air circulation holes 42 are provided on the vertical web 41 of the H-beam support beam 4. The upper end of the H-beam support beam 4 is fitted into the slot 611 of the reinforcing rib plate 61, and a pad 7 is provided between it and the bottom surface of the distribution plate body 1. The web of the H-beam support beam 4 extends downward from the slot 611. A pad 7 is also provided between the lower end of the H-beam support beam 4 and the supporting rib plate 62, and a fastening connection is achieved through threaded fasteners.

[0088] like Figure 3 As shown, in this embodiment, multiple air circulation holes 42 are provided at equal intervals along the center line of the web 41. The shape of the air circulation holes 42 can be any one of triangle, square, rhombus, circle, or ellipse, for example... Figure 3 The structure is displayed as a hexagonal or circular structure. The diameter of the circular airflow hole 42 is approximately 200 mm. This support beam structure with airflow holes 42 is lightweight and has a high load-bearing capacity. Compared to solid web support beams in the form of I-beams or H-beams, it can withstand larger spans and loads, reducing the structural weight and facilitating rapid and uniform air distribution between beams, thus ensuring uniform diffusion of air flowing through the air distribution pipe 2.

[0089] Example 2:

[0090] This embodiment provides an air distribution plate suitable for a hydrogen cyanide reactor. The air distribution plate is horizontally installed inside the hydrogen cyanide reactor and specifically includes a distribution plate body 1, an air distribution pipe 2, an inner wall support structure 3, and a support beam structure.

[0091] Compared with Example 1, such as Figure 4 As shown, the support beam structure in this embodiment is a polygonal structure support beam 5. The polygonal structure support beam 5 includes an upper support plate 51, a lower support plate 52, and a connecting rod 53 connecting the upper support plate 51 and the lower support plate 52. The upper support plate 51 of the polygonal structure support beam 5 is engaged in the slot 611 of the reinforcing rib plate 61, and a pad 7 is provided between it and the bottom surface of the distribution plate body 1. The connecting rod 53 of the polygonal structure support beam 5 extends downward from the slot 611. A pad 7 is also provided between the lower support plate 52 of the polygonal structure support beam 5 and the supporting rib plate 62, and a fastening connection is achieved by threaded fasteners.

[0092] like Figure 5 As shown, the connecting rod 53 in this embodiment is an inclined steel pipe, and the inclination directions of adjacent connecting rods 53 are opposite, so that adjacent connecting rods 53 form polygonal units with the shape of isosceles triangle (adjacent tops or bottoms are closely arranged) or isosceles trapezoid (adjacent tops or bottoms are left with a certain distance), and finally arranged to form a continuous polygonal unit.

[0093] The aforementioned support beam structure forms a truss-like structure, characterized by its lightweight and high load-bearing capacity. Compared to solid web support beams in the form of I-beams or H-beams, it can withstand larger spans and loads. Furthermore, the polygonal units formed by the connecting rods 53 facilitate the rapid and uniform distribution of air between the beams, thereby ensuring the uniform diffusion of air flowing through the air distribution pipe 2.

[0094] Example 3:

[0095] This embodiment provides a hydrogen cyanide reactor, which includes the air distribution plate described in Embodiment 1 or Embodiment 2 above, and also includes a raw material gas distributor 8 located above the air distribution plate. Other device structures / components within the hydrogen cyanide reactor can be specifically configured according to actual needs, and are not specifically limited here.

[0096] In this embodiment, the feed gas distributor 8 is used to introduce high-temperature methanol and ammonia feed gas into the hydrogen cyanide reactor. A fluidization space is formed between the air distribution plate and the feed gas distributor 8 to allow air and feed gas to mix and fully contact the catalyst.

[0097] like Figure 6 As shown, the raw material gas distributor 8 in this embodiment is provided with a plurality of nozzles 81, and the nozzles 81 are arranged in a one-to-one correspondence with the air distribution pipes 2 on the air distribution plate.

[0098] In the hydrogen cyanide reactor of this embodiment, air enters from the bottom of the reactor and is uniformly sprayed out vertically through the air distribution pipe. The air mixes more thoroughly with the raw material gas, and the catalyst originally distributed on the air distribution plate is in a fluidized state. It forms a convection with the raw material gas sprayed from the raw material gas distributor 8 located on the upper part of the air distribution plate, and a thorough mixing reaction is carried out. This greatly improves the product conversion rate and reactor performance, and saves the amount of catalyst used.

[0099] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. An air distribution plate, installed inside a hydrogen cyanide reactor, characterized in that, The air distribution plate includes: The main body of the horizontally installed distribution plate (1); An air distribution pipe (2) is vertically embedded in the main body (1) of the distribution plate; the air distribution pipe (2) includes a vertically equal diameter section (21) and a concentric unequal diameter section (22) that are integrally connected and run vertically through each other. The top of the vertically equal diameter section (21) is unobstructed, and the concentric unequal diameter section (22) is located at the lower end of the vertically equal diameter section (21) and its diameter converges downward. Inner wall support structure (3) for connecting the main body of the distribution plate (1) and the inner wall of the reactor (6); And, a support beam structure for supporting the bottom of the distribution plate body (1); the top of the support beam structure is fitted into the reinforcing rib plate (61) inside the reactor (6), and the bottom of the support beam structure is installed on the support rib plate (62) inside the reactor (6); The supporting beam structure is specifically one of the following structures: The H-beam support beam (4) has multiple air circulation holes (42) on its web plate (41). The polygonal support beam (5) includes an upper support plate (51), a lower support plate (52), and a connecting rod (53) connecting the upper support plate (51) and the lower support plate (52). The connecting rods (53) are arranged to form a continuous polygonal unit.

2. An air distribution plate according to claim 1, characterized in that, The axis of the air distribution pipe (2) is parallel to the central axis of the reactor (6); The air distribution pipes (2) are evenly distributed on the main body of the distribution plate (1).

3. An air distribution plate according to claim 1, characterized in that, The inner wall support structure (3) is a supporting angle steel; The supporting angle steel includes a vertical section and a horizontal section that are integrally connected. The vertical section is connected to the inner wall of the reactor (6), and the horizontal section has a round hole and is connected to the main body of the distribution plate (1) through a threaded fastener.

4. An air distribution plate according to claim 1, characterized in that, The main body of the distribution plate (1) is provided with radial elongated holes (11) evenly distributed along the circumference to compensate for the radial expansion difference between the main body of the distribution plate (1) and the inner wall of the reactor (6).

5. An air distribution plate according to claim 1, characterized in that, The reinforcing rib (61) has a T-shaped groove (611) on it. The upper end of the H-shaped steel support beam (4) or the upper support plate (51) of the polygonal structure support beam (5) is fitted into the slot (611) of the reinforcing rib plate (61), and a pad (7) is provided between it and the bottom surface of the distribution plate body (1). The web (41) of the H-beam support beam (4) or the connecting rod (53) of the polygonal structure support beam (5) extends downward from the slot (611).

6. An air distribution plate according to claim 1, characterized in that, A pad (7) is provided between the lower end of the H-shaped steel support beam (4) or the lower support plate (52) of the polygonal structure support beam (5) and the support stiffener plate (62), and a fastening connection is achieved by threaded fasteners.

7. An air distribution plate according to claim 1, characterized in that, The air circulation holes (42) are provided at equal intervals along the center line of the web (41); The shape of the air circulation hole (42) is any one of triangle, square, rhombus, hexagon, circle, or ellipse.

8. An air distribution plate according to claim 1, characterized in that, The connecting rod (53) is inclined and the inclination directions of adjacent connecting rods (53) are opposite, so that adjacent connecting rods (53) form polygonal units with the shape of isosceles triangles or isosceles trapezoids.

9. A hydrogen cyanide reactor, characterized in that, The air distribution plate according to any one of claims 1-8 is further comprising a raw material gas distributor (8) located above the air distribution plate. The air distribution plate and the raw material gas distributor (8) form a fluidization space for mixing air and raw material gas and making full contact with the catalyst.

10. A hydrogen cyanide reactor according to claim 9, characterized in that, The raw material gas distributor (8) is provided with a number of nozzles (81), and the nozzles (81) are arranged in a one-to-one correspondence with the air distribution pipes (2) on the air distribution plate.

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