A new type of platinum net support device for ammonia oxidation furnace

Abstract

The utility model relates to a novel platinum net supporting device of ammonia oxidation furnace, it mainly applies chemical industry, nitric acid production. The utility model discloses bracket beam, support ring, lower cone body, furnace wall, support, a plurality of support lug and a plurality of bolts are provided with support ring in furnace wall, and bracket beam is installed in furnace wall inner side, and the lower part of furnace wall is provided with lower cone body, and the bottom of bracket beam is installed with support, a plurality of support lug are all fixed on support ring, and a plurality of bolts are all installed on support ring. The utility model has the advantages of reasonable structure design, safe and reliable, reduces maintenance cost and maintenance difficulty, improves the whole rigidity of support, avoids the collapse of support, satisfies the use demand.

Description

Technical Field

[0001] This utility model relates to a support device, and more particularly to a novel platinum mesh support device for an ammonia oxidation furnace, which is mainly used in the chemical industry and nitric acid production. Background Technology

[0002] The ammonia oxidation furnace is a key piece of equipment in nitric acid production. Its main function is to allow an ammonia-air mixture to enter from the top, where it is reacted with a platinum mesh catalyst in the middle to generate nitrogen oxides and water vapor, which then enter the next process unit from the bottom. The main reaction of ammonia oxidation is: 4NH₃ + 5O₂ = 4NO + 6H₂O; this is a strongly exothermic reaction with a reaction temperature of 760–820℃, a pressure of 0.1–1.0 MPa, a linear velocity through the platinum mesh greater than 0.3 m / s, and an oxygen-to-ammonia ratio (O₂ / NH₃) of 1.7–2.0. A gas distributor is installed at the top of the furnace, while the platinum mesh catalyst is placed in the middle. The platinum mesh is mounted on a bracket, which is placed directly in the positioning groove between the bracket beam and the support ring. A sound-absorbing plate is located at the bottom of the furnace.

[0003] The original structure, such as Figures 1-2 As shown, due to the long-term operation of the platinum mesh support device in a high-temperature environment of 760-820℃, and the existence of certain unreasonable aspects in the original structure, the following problems have occurred: 1) The original design directly cuts grooves (groove depth 35) and M20*30 bolt holes 1-2 on the support ring 1-1. These grooves and holes are prone to stress concentration, causing the support ring 1-1 to crack along the grooves and holes; 2) The lower end of the double-ended stud is severely engaged with the threaded hole of the support ring 1-1, causing the stud to deform and become impossible to remove properly when replacement is needed; 3) The bracket beam 1-3 undergoes significant deformation and bending in the long-term high-temperature working environment.

[0004] Therefore, it is particularly necessary to provide a novel platinum mesh support device for ammonia oxidation furnace with a reasonable structural design, improved overall support rigidity, and elimination of local stress concentration. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned shortcomings in the existing technology and provide a new type of platinum mesh support device for ammonia oxidation furnace with reasonable structural design, safety and reliability, reduced maintenance costs and maintenance difficulty, improved overall support rigidity, and prevention of support collapse.

[0006] The technical solution adopted by this utility model to solve the above problems is as follows: the novel platinum mesh support device for ammonia oxidation furnace includes a bracket beam, a support ring, a lower cone and a furnace wall. The support ring is provided inside the furnace wall, the bracket beam is installed on the inner side of the furnace wall, and the lower cone is provided at the lower part of the furnace wall. The device is characterized by further including a bracket, multiple lugs and multiple bolts. The bracket is installed at the bottom of the bracket beam, the multiple lugs are all fixed on the support ring, and the multiple bolts are all installed on the support ring.

[0007] Preferably, the present invention has 28 lugs, all of which are welded to the support ring.

[0008] Preferably, the bracket beam and the support frame of this utility model are connected to form a "well" shape.

[0009] Preferably, the bracket described in this utility model is an arched bracket.

[0010] Preferably, the bolts of this invention are welded to the positioning holes of the support ring.

[0011] Compared with the prior art, this utility model has the following advantages and effects: the overall structural design is reasonable, the oxidation furnace operates well, the frequency of maintenance is effectively reduced, and no collapse occurs; the support ears are welded to the support ring, which eliminates stress concentration in the support ring groove from a structural perspective, and only a few cracked support ears need to be replaced, which greatly reduces maintenance costs; the bolts are directly welded to the positioning holes, which eliminates stress concentration in the support ring holes from a structural perspective; the bracket beam and the arched support form a "well" shape, which improves the overall rigidity and meets the usage requirements. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure before the modification.

[0013] Figure 2 This is a schematic diagram of the cross-sectional structure of the modified front support ring.

[0014] Figures 1-2 In the middle: support ring 1-1, bolt hole 1-2, support beam 1-3.

[0015] Figure 3 This is a structural schematic diagram of an embodiment of the present utility model.

[0016] Figure 4 This is a cross-sectional structural diagram of the support ring in an embodiment of this utility model.

[0017] In the diagram: 1. Bracket beam; 2. Support ring; 3. Bolt; 4. Support lug; 5. Lower cone; 6. Furnace wall; 7. Support. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0019] Example

[0020] See Figures 3 to 4The new platinum mesh support device for ammonia oxidation furnace includes a bracket beam 1, a support ring 2, a lower cone 5, a furnace wall 6, a bracket 7, multiple lugs 4, and multiple bolts 3. The support ring 2 is installed inside the furnace wall 6, the bracket beam 1 is installed on the inner side of the furnace wall 6, the lower cone 5 is installed at the lower part of the furnace wall 6, the bracket 7 is installed at the bottom of the bracket beam 1, the multiple lugs 4 are all fixed on the support ring 2, and the multiple bolts 3 are all installed on the support ring 2.

[0021] In this embodiment, there are twenty-eight lugs, all of which are welded to the support ring.

[0022] In this embodiment, the bracket beam and the support are connected to form a "well" shape; the support is an arched support; and the bolts are welded to the positioning holes of the support ring.

[0023] The platinum mesh support device for the nitrate ammonia oxidation furnace in this embodiment provides stable support for the platinum mesh and does not affect the support of the platinum mesh after thermal deformation. The specific improvements and effects are as follows:

[0024] 1) The groove on the support ring body was eliminated and replaced with a support ear structure (28 in total). The support ear 4 is welded to the support ring 2, which eliminates the stress concentration in the groove of the support ring 2 from the structure. At the same time, only a few cracked support ears need to be replaced, which greatly reduces the maintenance cost.

[0025] 2) The bolt holes on the support ring were removed, and the single-headed bolt 3 was directly welded to the positioning hole; this structurally eliminated the stress concentration in the holes of the support ring 2.

[0026] 3) An arched support 7 is added to the bottom of the bracket beam 1 to form a "well" shape, thereby improving the overall rigidity.

[0027] Based on the above description, those skilled in the art are already able to implement it.

[0028] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, all of which should fall within the protection scope of this utility model.

Claims

1. A novel platinum mesh support device for an ammonia oxidation furnace, comprising a bracket beam (1), a support ring (2), a lower cone (5), and a furnace wall (6), wherein the support ring (2) is provided inside the furnace wall (6), the bracket beam (1) is installed on the inner side of the furnace wall (6), and the lower cone (5) is provided at the lower part of the furnace wall (6), characterized in that: It also includes a bracket (7), multiple lugs (4) and multiple bolts (3). The bracket (7) is installed at the bottom of the bracket beam (1), the multiple lugs (4) are fixed on the bracket ring (2), and the multiple bolts (3) are installed on the bracket ring (2).

2. The novel platinum mesh support device for an ammonia oxidation furnace according to claim 1, characterized in that: There are twenty-eight support ears (4), and all twenty-eight support ears (4) are welded to the support ring (2).

3. The novel platinum mesh support device for an ammonia oxidation furnace according to claim 1, characterized in that: The bracket beam (1) and the support (7) are connected to form a "well" shape.

4. The novel platinum mesh support device for an ammonia oxidation furnace according to claim 1, characterized in that: The support (7) is an arched support (7).

5. The novel platinum mesh support device for an ammonia oxidation furnace according to claim 1, characterized in that: The bolt (3) is welded to the positioning hole of the support ring (2).

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