Corrosion-resistant microcrystalline silicon nitride coupon structure

Abstract

The utility model relates to the technical field of cement production, and discloses a corrosion-resistant microcrystalline silicon nitride hanging piece structure which comprises a plurality of hanging pieces which are arranged in a circumferential mode, sequentially connected in a hanging mode from top to bottom and form an inner cylinder of a preheater, and the hanging pieces are silicon nitride microcrystalline hanging pieces. When two vertically adjacent hanging pieces are matched and hung, the inner convex block at the top of the lower-layer hanging piece is hung on the outer convex block at the bottom of the upper-layer hanging piece; every two vertically adjacent hanging pieces are matched and hung and then are fixed through a bolt A; a heat-resistant steel inner cylinder is replaced by the silicon nitride microcrystal hanging piece inner cylinder, and only a damaged hanging piece needs to be replaced during replacement. The problems that a traditional ceramic hanging piece is short in service life, large in installation difficulty and not easy to replace are solved, the service life of the inner cylinder of the preheater is prolonged, and the production cost of cement is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of cement production, and in particular relates to a corrosion-resistant microcrystalline silicon nitride hanging sheet structure. Background Art

[0002] In the cement production industry, the preheater is the key equipment for clinker burning during cement production, and the preheater inner cylinder is its core component. In the past, the traditional inner cylinder was made of heat-resistant steel.

[0003] In order to reduce the wear of the cyclone, a hanging plate structure is generally installed on the inner wall of the cyclone so that the hanging plate contacts the cement raw material instead of the cyclone to reduce the wear of the cyclone. The hanging plate structure is fixed to the inner wall of the cyclone by multiple bolts, and the bolts are exposed to the outside, which will cause the bolts to rust, making the installation and replacement of the hanging plate more troublesome.

[0004] With the upgrading and iteration of cement technology and the development of the coordinated disposal of solid and hazardous waste, the working environment of the cyclone has become worse. Due to its high ambient temperature (about 1000℃), severe corrosion (containing harmful gases such as sulfur, acid, and alkali), and the high-speed scouring of the airflow of powder floating in the air, the heat-resistant steel inner tube quickly creeps, softens, and deforms, and the surface peels off until it fails and falls off. Generally, it needs to be replaced every 8-10 months, otherwise it will cause a large area of ​​falling and blockage, causing parking accidents. The traditional technology of hanging plate installation is inconvenient for the replacement of hanging plates.

[0005] Aiming at the working environment of the preheater and the problems that may be encountered when the inner cylinder of the preheater is made of ceramic material, a corrosion-resistant microcrystalline silicon nitride hanging sheet structure is proposed. Utility Model Content

[0006] In order to make up for the deficiencies of the prior art, the utility model proposes a corrosion-resistant microcrystalline silicon nitride hanging sheet structure.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A corrosion-resistant microcrystalline silicon nitride hanging sheet structure, comprising a plurality of hanging sheets arranged in a circle and sequentially hung from top to bottom to form an inner cylinder of a preheater, wherein the hanging sheets are silicon nitride microcrystalline hanging sheets;

[0009] When two adjacent hanging pieces are hung together, the inner protrusion on the top of the lower hanging piece is hung on the outer protrusion on the bottom of the upper hanging piece; the two adjacent hanging pieces are fixed by bolts A after being hung together.

[0010] Silicon nitride microcrystalline hanging sheets have the characteristics of high strength and corrosion resistance, and their service life can be increased by 2 to 3 times compared with heat-resistant steel.

[0011] Preferably, the main body of the hanging piece is an S-shaped hanging plate, an upper notch for cooperating with the outer convex block is formed between the hanging plate and the inner convex block, and a lower notch for cooperating with the inner convex block is formed between the hanging plate and the outer convex block.

[0012] Preferably, two holes for inserting the matching bolts A are respectively provided at the upper and lower ends of the hanging plate.

[0013] The design of the S-shaped hanging plate and the coordination of the upper and lower notches make the hanging pieces more tightly connected and provide better structural stability. The holes opened at the upper and lower ends of the hanging plate are convenient for the insertion and fixation of the bolts A, making the installation of the hanging pieces easier and faster.

[0014] Preferably, the installation gaps between adjacent hanging plates are filled with raw meal powder as the cement production system operates.

[0015] Preferably, the hanging plate at the top end of the inner tube of the preheater is threadedly connected to the metal cone sleeve through bolts B.

[0016] Preferably, the hanging piece at the bottom end of the inner cylinder of the preheater is circumferentially welded to the connecting block, and the welding height is 6 mm.

[0017] Compared with the prior art, the technical effects and advantages of the utility model are:

[0018] The corrosion-resistant microcrystalline silicon nitride hanging piece has the characteristics of high strength, high bending resistance, and corrosion resistance. Its service life can be increased by 2 to 3 times compared with heat-resistant steel, which reduces the production cost of cement. The inner tube of the silicon nitride microcrystalline hanging piece is an ideal replacement product for the heat-resistant steel inner tube. It solves the problems of short service life, difficult installation, and difficult replacement of traditional ceramic hanging pieces, increases the service life of the inner tube of the preheater, and reduces the production cost of cement;

[0019] The hanging plate of the hanging type connection is designed in a plate-like design, which avoids the blockage of the preheater caused by the scattering of the inner tube itself. When replacing, you only need to replace the damaged hanging plate, which correspondingly improves the production efficiency. Since the plate-like hanging plate composed of silicon nitride microcrystalline hanging plates is light in weight, no professional tools and lifting equipment are required during installation, which reduces labor intensity, can be installed in a very short time, and is very convenient for maintenance;

[0020] The installation gap of the hanging plate is filled with raw material powder as the system runs. The cyclone has gas-solid separation and the heat exchange efficiency reaches the efficiency of the integral inner cylinder, which reduces heat support, lowers energy consumption, reduces dust emissions, reduces the load of electric dust collector, and is more beneficial to the environment. Silicon nitride sleeve protection is used to prevent metal parts from wear, corrosion and rust. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of the hanging piece of the utility model;

[0022] Figure 2 It is a side view of the hanging piece of the utility model;

[0023] Figure 3 This is the front view of the hanging piece of the utility model;

[0024] Figure 4 It is a top view of the inner cylinder of the preheater of the utility model;

[0025] Figure 5 For this utility model Figure 4 Section view along the middle line HH.

[0026] In the figure: 1, hanging piece; 101, inner protrusion; 102, outer protrusion; 103, hanging plate; 104, upper notch; 105, lower notch; 106, hole position; 2, bolt A; 3, bolt B; 4, metal cone sleeve; 5, connecting block. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The following is combined with Figures 1 to 5 To further explain this application in detail,

[0029] The embodiment of the present application discloses a corrosion-resistant microcrystalline silicon nitride hanging sheet structure, comprising a plurality of hanging sheets 1 arranged in a circle and sequentially hung from top to bottom to form a preheater inner cylinder. The top view of the preheater inner cylinder is shown in FIG. Figure 4 As shown, the hanging piece 1 is a silicon nitride microcrystalline hanging piece;

[0030] When two adjacent hanging plates 1 are hung together, the inner protrusion 101 at the top of the lower hanging plate 1 is hung on the outer protrusion 102 at the bottom of the upper hanging plate 1; the two adjacent hanging plates 1 are hung together and fixed by bolts A2.

[0031] The preheater is a key equipment in cement production, and the inner cylinder is its core component. The traditional inner cylinder is made of cast heat-resistant steel, but this material is prone to creep softening and deformation under the high-intensity working environment of the cyclone. The harsh working environment of the cyclone causes the heat-resistant steel inner cylinder to fail quickly and requires frequent replacement. In order to solve this problem, a silicon nitride microcrystalline hanging plate has been developed. The hanging plate 1 has the characteristics of high strength and corrosion resistance, and its service life can be increased by 2 to 3 times compared with heat-resistant steel. The silicon nitride microcrystalline hanging plate inner cylinder is an ideal replacement product for the heat-resistant steel inner cylinder. The development of the silicon nitride microcrystalline hanging plate solves the problems of short service life, difficult installation, and difficult replacement of traditional ceramic hanging plates 1. The application of silicon nitride microcrystalline hanging plates is expected to reduce the production cost of cement and improve production efficiency.

[0032] The main body of the hanging piece 1 is an S-shaped hanging plate 103, an upper notch 104 for cooperating with the outer protrusion 102 is formed between the hanging plate 103 and the inner protrusion 101, and a lower notch 105 for cooperating with the inner protrusion 101 is formed between the hanging plate 103 and the outer protrusion 102.

[0033] The upper and lower ends of the hanging plate 103 are respectively provided with two holes 106 for the mating bolts A2 to penetrate.

[0034] The design of the S-shaped hanging plate 103 and the coordination of the upper notch 104 and the lower notch 105 make the hanging plates 1 more tightly connected and provide better structural stability. The holes 106 opened at the upper and lower ends of the hanging plate 103 facilitate the insertion and fixation of the bolts A2, making the installation of the hanging plate 1 easier and faster. Due to the design of the hanging plate 1 structure, replacement and installation are more convenient, reducing the cost and time of maintenance and replacement. The improved durability of the inner tube means reduced downtime, thereby improving the overall efficiency of the cement production line. Although the silicon nitride material itself is relatively expensive, in the long run, due to its durability and reduced maintenance costs, it can reduce the overall cost of cement production.

[0035] The installation gaps between adjacent hanging plates 1 are filled with raw material powder as the cement production system operates.

[0036] The movement of the raw meal powder in the inner cylinder of the preheater will fill the gaps between the hanging plates 1, thereby reducing air flow resistance and improving heat exchange efficiency. The raw meal powder filling the gaps helps to reduce air leakage in the preheater, improves thermal energy utilization efficiency, and reduces energy consumption. The filling effect of the raw meal powder can enhance the stability of the structure of the hanging plates 1, reduce vibration or looseness that may be caused by the existence of gaps, reduce wear between the hanging plates 1, and extend the service life of the inner cylinder.

[0037] The hanging plate 1 at the top end of the inner tube of the preheater is threadedly connected to the metal cone sleeve 4 through bolts B3.

[0038] The threaded connection between the bolt B3 and the metal cone sleeve 4 provides a strong connection strength, ensuring the stability and safety of the top hanging piece 1. If the top hanging piece 1 needs to be replaced, the threaded connection design makes disassembly and installation more convenient and quick. The tight threaded connection helps to reduce the leakage of heat and raw materials and improve the preheating efficiency.

[0039] The hanging piece 1 at the bottom end of the inner tube of the preheater is circumferentially welded to the connecting block 5, and the welding height is 6 mm.

[0040] The circumferential welding provides a firm connection with the connecting block 5, and enhances the overall structural strength of the hanging plate 1. The appropriate welding height can ensure that the hanging plate 1 will not loosen due to vibration during long-term operation. The circumferential welding helps the raw material powder to form a uniform laminar flow on the surface of the hanging plate 1, thereby improving the heat exchange efficiency. The stability of the welded connection helps to extend the service life of the inner cylinder of the preheater and reduce the frequency of maintenance and replacement due to connection problems.

[0041] The installation requirements for silicon nitride microcrystal hanging pieces are as follows:

[0042] The installation of silicon nitride microcrystalline hanging pieces must ensure that the overall circumference is φ3900±10mm, the entire circle of the base must be level, and the base bolts must be tightened in place.

[0043] 1. Ensure that the material, specification and quantity of the preheater hanging plate 1 meet the requirements of the design drawings.

[0044] 2. Before installing the preheater hanging piece 1, clean the inside of the preheater to ensure that it is clean and free of debris.

[0045] 3. According to the requirements of the design drawings, place the preheater hanging plate 1 at the designed position and adjust its horizontality and verticality.

[0046] 4. Hang the preheater hanging piece 1 at the installation location and secure it.

[0047] 5. During the fixing process, attention should be paid to the stability and verticality of each position of the preheater hanging plate 1, and corresponding measures should be taken to adjust it.

[0048] 6. The gaps reserved between structures need to be checked during the installation of the hanging piece 1 and processed according to the design requirements.

[0049] 7. After the installation is completed, a comprehensive inspection is required, including the horizontality, verticality, fixity and other aspects of the hanging piece 1 to ensure that the installation quality of the preheater hanging piece 1 meets the design requirements.

[0050] The silicon nitride microcrystalline hanging sheet has extremely high corrosion resistance and wear resistance, and can resist corrosion and wear in harsh working environments, thereby extending the service life of the inner tube and reducing the need for frequent replacement. The design of the S-shaped hanging plate 103 and the coordination of the upper notch 104 and the lower notch 105 provide better structural stability and reduce the frequency of maintenance and replacement due to vibration or looseness. The holes 106 opened at the upper and lower ends of the hanging plate 103 are convenient for the insertion and fixation of the bolts A2, making the installation of the hanging sheet 1 easier and faster, and reducing the cost and time of maintenance and replacement.

[0051] The filling effect of the raw material powder can enhance the stability of the structure of the hanging piece 1, reduce the vibration or looseness that may be caused by the existence of gaps, and also reduce the air leakage in the preheater, thereby improving the utilization efficiency of thermal energy. The top hanging piece 1 is threadedly connected to the metal cone sleeve 4 by bolts B3, which provides a strong connection strength, ensures the stability and safety of the top hanging piece 1, and helps to reduce the leakage of heat and raw materials. The bottom hanging piece 1 is circumferentially welded to the connecting block 5, with a weld height of 6 mm, which provides a firm connection with the connecting block 5 and enhances the overall structural strength of the hanging piece 1.

[0052] In summary, the above design solves the problems of easy wear, rapid corrosion, frequent replacement and difficult installation of traditional inner tube materials by improving corrosion resistance and wear resistance, enhancing structural stability, simplifying the installation and replacement process, reducing air leakage and improving heat exchange efficiency, as well as enhancing the overall structural strength. It thereby improves the performance and service life of the inner tube of the preheater, reduces cement production costs and improves production efficiency.

[0053] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A corrosion-resistant microcrystalline silicon nitride hanging sheet structure, characterized in that: It comprises a plurality of hanging pieces (1) which are arranged in a circle and are hung in sequence from top to bottom to form an inner cylinder of a preheater, wherein the hanging pieces (1) are silicon nitride microcrystalline hanging pieces; When the upper and lower adjacent hanging plates (1) are connected in coordination, the inner protrusion (101) at the top of the lower hanging plate (1) is connected to the outer protrusion (102) at the bottom of the upper hanging plate (1); after the upper and lower adjacent hanging plates (1) are connected in coordination, they are fixed by bolts A (2); The main body of the hanging piece (1) is an S-shaped hanging plate (103), an upper notch (104) for cooperating with the outer protrusion (102) is formed between the hanging plate (103) and the inner protrusion (101), and a lower notch (105) for cooperating with the inner protrusion (101) is formed between the hanging plate (103) and the outer protrusion (102).

2. The corrosion-resistant microcrystalline silicon nitride hanging sheet structure according to claim 1, characterized in that: The upper and lower ends of the hanging plate (103) are respectively provided with two holes (106) for inserting the matching bolts A (2).

3. The corrosion-resistant microcrystalline silicon nitride hanging sheet structure according to claim 1, characterized in that: The hanging piece (1) at the top end of the inner tube of the preheater is threadedly connected to the metal cone sleeve (4) through a bolt B (3).

4. The corrosion-resistant microcrystalline silicon nitride hanging sheet structure according to claim 1, characterized in that: The hanging piece (1) at the bottom end of the inner cylinder of the preheater is circumferentially welded to the connecting block (5).

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