Small ammoxidation furnace waste heat recovery complete device

Abstract

The utility model discloses waste heat recovery complete equipment for a small ammoxidation furnace, and belongs to the technical field of ammoxidation furnaces. The waste heat recovery complete equipment comprises a furnace end and a furnace body, the furnace end comprises a maneuvering device, a catalyst basket, an ignition device and a rotating device; the catalyst basket comprises four identical right-angle sectors, the linear edge of each right-angle sector wraps an L-shaped steel plate, the right-angle sectors are connected through bolts, welding bolts for lifting lugs are reserved in each right-angle sector, and the lifting lugs and the furnace end are of a bolt detachable structure. The catalyst basket is composed of four identical right-angle sectors, the length of each L-shaped plate is reduced, bending deformation in the later high-temperature using process due to the too long length is avoided, meanwhile, parts are conveniently maintained and replaced in a split mode, and resources are saved; a lifting lug of the catalyst basket adopts a bolt detachable structure, so that the catalyst net is convenient to mount and use; meanwhile, the catalyst baskets are connected through bolts, and welding bolts are reserved for lifting lugs of the catalyst baskets, so that later maintenance, replacement and lifting are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of ammonia oxidation furnaces, and in particular relates to a complete set of waste heat recovery equipment for a small-sized ammonia oxidation furnace. Background Art

[0002] Nitric acid is an important chemical raw material, widely used in fertilizers, pesticides, explosives, dyes, salt, etc. As one of the core key equipment in the nitric acid production process, the ammonia oxidation reaction waste heat recovery furnace has a highly integrated process, complex equipment structure, high reaction temperature, and a large amount of heat released during the reaction. Long-term high temperature in the furnace will cause warping and deformation of components, resulting in gaps or damage, which will force the reaction to stop and affect production. Therefore, optimizing the ammonia oxidation reaction and waste heat recovery equipment is of great significance to the long-term development of the nitric acid industry. Summary of the invention

[0003] In order to solve the above technical problems, the utility model discloses a complete set of waste heat recovery equipment for a small ammonia oxidation furnace.

[0004] In order to achieve the above purpose, the specific technical solution of this application is as follows:

[0005] A complete set of waste heat recovery equipment for a small ammonia oxidation furnace comprises a furnace head and a furnace body; the furnace head comprises a motorized device, a catalyst basket, an ignition device, and a rotating device; the catalyst basket comprises four identical right-angle sectors, the straight edge of each right-angle sector is wrapped with an L-shaped steel plate, each right-angle sector is connected by bolts, each right-angle sector is reserved with a welding bolt for a lifting ear, and the lifting ear and the furnace head adopt a bolt-detachable structure.

[0006] Based on the above technical features, further, the rotating device is connected to the motorized device through a main shaft, and the main shaft is a steel pipe with a diamond-shaped cross-section.

[0007] Based on the above technical features, further, the furnace body includes a water-cooled wall, a spiral coil and a coil support, and the spiral coil includes a pre-evaporator, a superheater and an evaporator arranged from top to bottom.

[0008] Based on the above technical features, further, the furnace head and the furnace body are flange-connected.

[0009] Based on the above technical features, preferably, the right-angle fan-shaped material is Alloy 600 alloy.

[0010] Based on the above technical features, preferably, the outer shells of the furnace head and the furnace body are both made of stainless steel.

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

[0012] The catalyst basket is composed of 4 identical right-angled sectors, which reduces the length of each L-shaped plate to avoid bending and deformation during high-temperature use due to its length. Even if deformation occurs, it is convenient to repair and replace parts in sections, saving resources.

[0013] The lifting lugs of the catalyst basket are bolt-detachable, which is convenient for the installation and use of the catalyst net; at the same time, each catalyst basket is connected by bolts, and each reserved lifting lug is welded with bolts, which is convenient for later maintenance, replacement and lifting;

[0014] The main shaft of the rotating device adopts a diamond-shaped steel pipe design to increase rigidity and avoid eccentric deformation during high-temperature operation in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a complete set of waste heat recovery equipment for a small ammonia oxidation furnace according to the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of a burner head in a complete set of waste heat recovery equipment for a small ammonia oxidation furnace according to the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of a catalyst basket in a complete set of waste heat recovery equipment for a small-scale ammonia oxidation furnace according to the utility model;

[0018] List of Figure Symbols:

[0019] 1. Furnace head; 2. Furnace body; 3. Motorized device; 4. Rotating device; 5. Main shaft; 6. Flange; 7. Catalyst basket; 701. Right-angle fan; 702. L-shaped steel plate; 8. Ignition device; 9. Spiral coil; 10. Lifting ear; 11. Water-cooled wall; 12. Coil support. DETAILED DESCRIPTION

[0020] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0021] It should be noted that the words "up", "down", "left", "right", "front" and "rear" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0022] like Figure 1 As shown, a small-scale ammonia oxidation furnace waste heat recovery complete set device comprises a furnace head 1 and a furnace body 2; the furnace head 1 and the furnace body 2 are sealed and connected by a flange 6. Preferably, the shells of the furnace head 1 and the furnace body 2 are both made of stainless steel.

[0023] The furnace head includes a motorized device 3, a catalyst basket 7, an ignition device 8, and a rotating device 4. The rotating device 4 is connected to the motorized device 3 through a main shaft 5, and the main shaft 5 is a thickened steel pipe with a diamond-shaped cross section, so as to avoid the problem of eccentric deformation of the rotating device during high-temperature operation in the later stage, ensure the concentricity of the main shaft and the furnace head during assembly, and take optimization measures from all aspects.

[0024] like Figure 2-Figure 3 As shown, the catalyst basket 7 includes four identical right-angled sectors 701, and the straight edge of each right-angled sector 701 is wrapped with an L-shaped steel plate 702. Each right-angled sector 701 is connected by bolts, and each right-angled sector is reserved with a lifting ear 10 for welding bolts, and the lifting ear 10 and the furnace head 1 adopt a bolt-detachable structure. The catalyst basket is designed in four pieces to reduce the length of each L-shaped plate to avoid bending and deformation during high-temperature use due to the long length. Even if deformation occurs, it is convenient to repair and replace parts in pieces, saving resources. Secondly, the lifting ear of the catalyst basket adopts a bolt-detachable structure, which is convenient for the installation and use of the catalyst net; at the same time, each catalyst basket is connected by bolts, and each reserved lifting ear is welded with bolts, which is convenient for later maintenance, replacement and lifting. Preferably, the material of the right-angled sector is Alloy 600 with a thickness of 2mm.

[0025] like Figure 1 As shown, the furnace body 2 includes a water-cooled wall 11, a spiral coil 9 and a coil support 12. The spiral coil 9 includes a pre-evaporator, a superheater and an evaporator arranged from top to bottom. The pre-evaporator is used to protect the superheater to reduce the direct heat radiation of high temperature to the superheater and avoid the problem of superheater explosion.

[0026] It should be noted that the drawings only illustrate the technical ideas of the present invention, and the protection scope of the present invention cannot be limited by this shape. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A complete set of waste heat recovery equipment for a small ammonia oxidation furnace, characterized by: It includes a furnace head and a furnace body; the furnace head includes a motorized device, a catalyst basket, an ignition device, and a rotating device; the catalyst basket includes four identical right-angled sectors, the straight edge of each right-angled sector is wrapped with an L-shaped steel plate, each right-angled sector is connected by bolts, each right-angled sector is reserved with a welding bolt for a lifting ear, and the lifting ear and the furnace head adopt a bolt-detachable structure.

2. A complete set of waste heat recovery equipment for a small-scale ammonia oxidation furnace according to claim 1, characterized in that: The rotating device is connected to the motorized device via a main shaft, and the main shaft is a steel pipe with a diamond-shaped cross section.

3. A complete set of waste heat recovery equipment for a small-scale ammonia oxidation furnace according to claim 1, characterized in that: The furnace body comprises a water-cooled wall, a spiral coil and a coil support, and the spiral coil comprises a pre-evaporator, a superheater and an evaporator arranged from top to bottom.

4. A complete set of waste heat recovery equipment for a small-scale ammonia oxidation furnace according to claim 1, characterized in that: The furnace head is flange-connected to the furnace body.

5. A complete set of waste heat recovery equipment for a small-scale ammonia oxidation furnace according to claim 1, characterized in that: The material of the right-angle sector is Alloy 600 alloy.

6. A complete set of waste heat recovery equipment for a small-scale ammonia oxidation furnace according to claim 1, characterized in that: The shells of the furnace head and the furnace body are both made of stainless steel.

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