Leak-proof integrated sealing structure of ammonia oxidation furnace packing frame

Abstract

The utility model discloses a kind of leak-proof ammonia oxidation furnace packing frame integrated type sealing structure, it is related to ammonia oxidation furnace technical field, to solve the current sealing mode can make packing frame due to temperature sharp change leads to deformation, cause fastening bolt fracture, lead to the technical problem of not tight sealing, including sealing plate, the sealing plate includes sealing part, the side end of the sealing part is equipped with connecting groove, the connecting groove extends from the upper end of sealing part to the middle position of sealing part, the lower end of the sealing part is equipped with thickening part, the section of the thickening part is triangularly arranged, the lower end of the thickening part is upwardly inclined inclined plane, the upper end of the thickening part is equipped with limiting part, the upper end of the limiting part is equipped with support part.The utility model has the advantages that by arc-shaped sealing plate ring welding, unique limiting groove design, solve packing frame deformation and bolt fracture problem, eliminate not tight sealing, guarantee the advantage of equipment stable operation.

Description

Technical Field

[0001] This utility model relates to the field of ammonia oxidation furnace technology, and more specifically, to an integrated sealing structure for a leak-proof ammonia oxidation furnace packing frame. Background Technology

[0002] The ammonia oxidation furnace is a key piece of equipment in the catalytic oxidation of ammonia. It is mainly used to oxidize a mixture of ammonia and air to nitric oxide under the action of a catalyst, a crucial step in the production of chemical products such as nitric acid. Its structure typically includes a furnace body, a catalyst layer, and a gas distribution device. The furnace temperature needs to be precisely controlled at around 800℃ to ensure reaction efficiency. The equipment materials must be heat-resistant and corrosion-resistant; a platinum-rhodium alloy mesh is a common catalyst. During operation, the equipment must ensure uniform gas mixing and stable flow to achieve efficient ammonia conversion. It is also equipped with a safety protection system to prevent explosions and other dangerous situations, making it vital in chemical production.

[0003] Traditional ammonia oxidizer designs separate the packing frame from the furnace body, using asbestos gaskets and bolts for sealing. However, ammonia oxidation reactions occur at temperatures above 900℃, leading to rapid temperature changes that deform the packing frame, causing bolt breakage and resulting in a poor seal. This can cause the gasket between the packing frame and the furnace to fail, allowing some of the ammonia-air mixture to bypass the platinum mesh catalyst and pass through the packing frame gasket, forming ammonium salts in subsequent reactions. This poses a potential safety risk and wastes the liquid ammonia used for nitric acid production. Therefore, we propose an integrated sealing structure for the ammonia oxidizer packing frame to prevent leakage. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide an integrated sealing structure for the packing frame of an ammonia oxidation furnace that prevents leakage, so as to solve the technical problem that the current sealing method causes the packing frame to deform due to rapid temperature changes, resulting in the breakage of fastening bolts and thus poor sealing.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an integrated sealing structure for a leak-proof ammonia oxidation furnace packing frame, including a sealing plate, the sealing plate including a sealing part, a connecting groove being provided on one side end of the sealing part, the connecting groove extending from the upper end of the sealing part to the middle position of the sealing part, a thickened part being provided at the lower end of the sealing part, the cross-section of the thickened part being triangular, the lower end of the thickened part being an upwardly inclined slope, a limiting part being provided at the upper end of the thickened part, and a supporting part being provided at the upper end of the limiting part.

[0006] Preferably, the sealing plate is arranged in an arc shape along the short axis direction, and there are a plurality of sealing plates, which form a ring.

[0007] Preferably, a connecting part is provided on the side of the sealing part away from the connecting groove, the height of the connecting part from top to bottom is the same as the height of the connecting groove, and the size of the connecting part is adapted to the size of the connecting groove.

[0008] Preferably, the limiting part is arc-shaped along the long axis, the limiting part is located inside the sealing part, and a limiting groove is formed between the limiting part and the sealing part.

[0009] Preferably, the support portion is bent inward along its long axis, the tail of the support portion is horizontal, and ventilation holes are evenly distributed on the support portion.

[0010] Preferably, a support groove is provided on the lower end face of the tail of the support part, and a support strip is provided on one side end of the support part, the size of the support strip being adapted to the size of the support groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention utilizes a sealing plate structure, employing several arc-shaped sealing plates along the short axis to form a ring structure. These plates are continuously and tightly welded to the contact area between the packing frame and the ammonia oxidation furnace, replacing the traditional bolt connection method. Furthermore, a limiting groove is formed between the limiting part and the sealing part. During the welding of the packing frame, the lower end of the packing frame can be inserted into the limiting groove, providing a dual function: supporting the packing frame and limiting and fixing it. This effectively restricts the lower edge of the packing frame, resisting deformation caused by temperature changes and ensuring a good fit between the packing frame and the sealing structure. This further strengthens the sealing effect and avoids the problem of bolt breakage due to deformation caused by rapid temperature changes in the packing frame. It fundamentally eliminates the phenomenon of incomplete sealing, effectively preventing leakage of ammonia-air mixture and eliminating the safety hazards caused by the formation of ammonium salts due to leakage. Simultaneously, it reduces the loss of liquid ammonia used in nitric acid production, solving the problem that current sealing methods cause deformation of the packing frame due to rapid temperature changes, leading to bolt breakage and incomplete sealing.

[0013] This invention also features a thickened section with an upward-sloping lower end. This design precisely guides and directs the ammonia-air mixture as it rises, resulting in a more uniform gas distribution within the furnace. Simultaneously, it promotes further mixing of the ammonia-air mixture, ensuring the ammonia-to-air ratio is more aligned with the ideal reaction conditions. This creates superior gas conditions for the subsequent oxidation reaction on the platinum mesh catalyst. Furthermore, the thickened design enhances the support strength of the lower part of the sealing plate, providing greater stability and reliability of the entire sealing structure at high temperatures, ensuring the continuous and stable operation of the ammonia oxidation furnace. Additionally, the support section, located inside the packing frame, provides stable auxiliary support after the platinum mesh catalyst is installed, ensuring the catalyst remains stable during operation and preventing vibration or displacement from affecting the catalytic effect. Attached Figure Description

[0014] Figure 1 This is a front view structural diagram of the present utility model;

[0015] Figure 2 This is a bottom view of the structure of this utility model;

[0016] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 4 This is a partial front view structural schematic diagram of the present invention;

[0018] Figure 5 This is a partial bottom view of the structure of this utility model.

[0019] The following are the labels in the diagram: 100, sealing plate; 101, sealing part; 102, connecting groove; 103, connecting part; 104, thickened part; 105, limiting part; 106, limiting groove; 107, supporting part; 108, supporting groove; 109, supporting strip. Detailed Implementation

[0020] like Figures 1 to 5As shown, this utility model relates to an integrated sealing structure for a leak-proof ammonia oxidation furnace packing frame, including a sealing plate 100. The sealing plate 100 includes a sealing part 101. A connecting groove 102 is provided on one side of the sealing part 101, extending from the upper end of the sealing part 101 to the middle position. A thickened part 104 is provided at the lower end of the sealing part 101. The cross-section of the thickened part 104 is triangular, and the lower end of the thickened part 104 is an upwardly inclined surface. A limiting part 105 is provided at the upper end of the thickened part 104, and a supporting part 107 is provided at the upper end of the limiting part 105. This utility model's sealing structure, through the annular welding of the arc-shaped sealing plate 100 and the unique limiting groove 106 design, solves the problems of packing frame deformation and bolt breakage, eliminating incomplete sealing. The thickened part 104 guides flow and promotes mixing, while the supporting part 107 assists in stabilization, improving reaction efficiency, reducing raw material loss, eliminating safety hazards, and ensuring stable equipment operation.

[0021] Specifically, the sealing plate 100 is arranged in an arc shape along its short axis, and several sealing plates 100 are arranged to form a ring. The sealing plates 100 are made of stainless steel. The ring of sealing plates 100 can be welded around the packing frame and into contact with the ammonia oxidation furnace. 2520 stainless steel plates (δ=3-5mm) are used for continuous and tight welding to achieve a tight seal. This method provides better sealing compared to bolted connections and prevents bolt breakage that could lead to a poor seal.

[0022] Furthermore, a connecting portion 103 is provided on the side of the sealing part 101 facing away from the connecting groove 102. The height of the connecting portion 103 from top to bottom is the same as the height of the connecting groove 102, and the size of the connecting portion 103 is adapted to the size of the connecting groove 102. When the sealing plates 100 are welded, a single-piece welding method is adopted until the welding forms a ring. During the process, the connecting portion 103 of the sealing part 101 can be inserted into the connecting groove 102. At the same time as welding, adjacent sealing plates 100 can be connected to each other, which can ensure the overall strength of the sealing structure after welding.

[0023] It is worth noting that the limiting part 105 is arc-shaped along its long axis and is located inside the sealing part 101. A limiting groove 106 is formed between the limiting part 105 and the sealing part 101. When the packing frame is welded to the sealing plate 100, the lower end of the packing frame can be inserted into the limiting groove 106 between the limiting part 105 and the sealing part 101. This not only supports the packing frame but also limits its position. After the lower end of the packing frame is limited, it can effectively prevent the packing frame from deforming during use.

[0024] It is worth noting that the support portion 107 is curved inward along its long axis, and its tail is horizontal. Ventilation holes are evenly distributed on the support portion 107. The lower end of the thickened portion 104 is an upward-sloping surface. When the ammonia-air mixture rises, the slope at the lower end of the thickened portion 104 guides and directs its flow, ensuring a more uniform gas distribution within the furnace. This also facilitates further mixing of the ammonia-air mixture during flow, bringing the ammonia-to-air ratio closer to the ideal reaction state. This provides better gas conditions for the subsequent oxidation reaction on the platinum mesh catalyst, thereby improving the conversion rate of ammonia and the efficiency of nitric oxide generation.

[0025] It is worth noting that a support groove 108 is provided on the lower end face of the support part 107, and a support strip 109 is provided on one side end of the support part 107. The size of the support strip 109 is adapted to the size of the support groove 108. The support part 107 is located inside the packing frame. After the platinum mesh catalyst is installed, the support part 107 can provide auxiliary support for the platinum mesh catalyst to ensure the stability of the platinum mesh catalyst. Secondly, the thickening of the thickened part 104 can ensure the strength of the lower support of the sealing plate 100.

[0026] Working Principle: This embodiment provides an integrated sealing structure for a leak-proof ammonia oxidizer packing frame. In use, several arc-shaped sealing plates 100 along their minor axis are welded together around the inner wall of the ammonia oxidizer to form a ring. During welding, the connecting part 103 of the sealing part 101 is inserted into the connecting groove 102 of the adjacent sealing plate 100. This not only achieves the interconnection between the sealing plates 100 but also ensures the overall strength of the sealed structure after welding, preventing sealing failure due to temperature changes. When welding the packing frame, the lower end of the packing frame is inserted into the limiting groove 106 between the limiting part 105 and the sealing part 101. The limiting groove 106 supports and limits the packing frame, effectively limiting the lower end of the packing frame and preventing deformation due to temperature changes during use, thereby ensuring... To ensure a good sealing effect, during use after welding, when the ammonia-air mixture rises in the ammonia oxidation furnace, the upward-sloping surface at the lower end of the thickened part 104 guides and directs the gas flow, promoting a more uniform gas distribution within the furnace. This also helps further mix the ammonia-air mixture, making the ammonia-air ratio more suitable for the ideal reaction state. This creates better gas conditions for the subsequent oxidation reaction on the platinum mesh catalyst, thereby improving the conversion rate of ammonia and the generation efficiency of nitric oxide. Furthermore, the support part 107, located inside the packing frame, provides auxiliary support after the platinum mesh catalyst is installed, ensuring its stability. Simultaneously, the thickened design of the thickened part 104 enhances the support strength of the lower part of the sealing plate 100, further ensuring the stable operation of the entire sealing structure under high-temperature conditions and effectively preventing leakage.

[0027] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A leak-proof integrated sealing structure for an ammonia oxidation furnace packing frame, characterized in that, The sealing plate (100) includes a sealing part (101). A connecting groove (102) is provided on one side of the sealing part (101). The connecting groove (102) extends from the upper end of the sealing part (101) to the middle position of the sealing part (101). A thickened part (104) is provided at the lower end of the sealing part (101). The cross-section of the thickened part (104) is triangular. The lower end of the thickened part (104) is an upwardly inclined slope. A limiting part (105) is provided at the upper end of the thickened part (104). A supporting part (107) is provided at the upper end of the limiting part (105).

2. The integrated sealing structure for a leak-proof ammonia oxidizer packing frame according to claim 1, characterized in that, The sealing plate (100) is arranged in an arc shape along the short axis direction, and there are a plurality of sealing plates (100), which together form a ring.

3. The integrated sealing structure for a leak-proof ammonia oxidation furnace packing frame according to claim 2, characterized in that, The sealing part (101) is provided with a connecting part (103) on the side opposite to the connecting groove (102). The height of the connecting part (103) from top to bottom is the same as the height of the connecting groove (102), and the size of the connecting part (103) is adapted to the size of the connecting groove (102).

4. The integrated sealing structure for a leak-proof ammonia oxidation furnace packing frame according to claim 3, characterized in that, The limiting part (105) is arc-shaped along the long axis direction. The limiting part (105) is located inside the sealing part (101). A limiting groove (106) is formed between the limiting part (105) and the sealing part (101).

5. The leak-proof integrated sealing structure for an ammonia oxidizer packing frame according to claim 4, characterized in that, The support part (107) is bent inward along the long axis, the tail of the support part (107) is horizontal, and ventilation holes are evenly provided on the support part (107).

6. The leak-proof integrated sealing structure for an ammonia oxidizer packing frame according to claim 5, characterized in that, The lower end face of the support part (107) is provided with a support groove (108), and a support bar (109) is provided on one side end of the support part (107). The size of the support bar (109) is adapted to the size of the support groove (108).

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