A protective boiler tube for circulating fluidized beds

Abstract

This utility model discloses a protective boiler tube for a circulating fluidized bed, comprising a boiler tube with multiple first arc-shaped protective plates uniformly fixedly installed on its outer wall surface, and second protective plates uniformly fixedly installed on its outer wall surface. Fixing strips are uniformly fixedly installed between the multiple first arc-shaped protective plates. A refractory and wear-resistant castable layer is fixedly connected to one side wall of the boiler tube, located within the grid between the first arc-shaped protective plates and the fixing strips. The advantages of this utility model include: a more reasonable and compact structural design, ease of processing, low manufacturing cost, good refractory and wear resistance, good compressive strength, good deformation resistance, more stable and reliable fixing, full protection of the boiler tube, extension of the boiler tube's service life, and economic and environmental benefits.

Description

Technical Field

[0001] This utility model relates to the technical field of circulating fluidized bed accessories, specifically a protective boiler embedded tube for circulating fluidized beds. Background Technology

[0002] In the operation of a circulating fluidized bed boiler, the sub-bed tubes serve as the main heating surface in the furnace, bearing approximately 30% of the load. The working environment is harsh, subjecting the sub-bed tubes to the combined effects of high-temperature flame burning and impact abrasion from high-temperature material particles, leading to two drawbacks: 1) The tube walls thin out rapidly. Statistics show that the wear and thinning of the tube walls near the fire end can reach approximately 2mm per year. This poses a serious threat to the continuous and safe operation of the boiler, increasing the workload of temporary maintenance and major overhauls, resulting in significant economic losses for the company; 2) It greatly increases the probability of sudden tube rupture accidents, forcing an emergency boiler shutdown for maintenance. Furthermore, boiler maintenance involves various hazardous operations, resulting in long maintenance cycles, high time and labor costs, severely restricting the company's production continuity.

[0003] To overcome the above shortcomings, the general solution is to increase the monitoring and inspection of the boiler's operating status by production personnel. Production personnel are required to conduct visual monitoring and inspection every shift. However, this method is time-consuming and cannot intuitively determine the amount of thinning of the boiler's buried tube wall, thus failing to effectively determine the actual usage status of the boiler's buried tube. This not only wastes manpower and resources but also fails to solve the problem at its root.

[0004] The existing boiler tubes have been reinforced with wear-resistant structures, but the structure is not securely fixed and the deformation resistance is not very good. Utility Model Content

[0005] The purpose of this utility model is to provide a protective boiler tube for circulating fluidized beds that has a more reasonable structural design, compact structure, is easy to process, has low processing and manufacturing costs, is fire-resistant and wear-resistant, has good pressure resistance, good deformation resistance, is more stable and reliable in fixing, fully protects the boiler tube, extends the service life of the boiler tube, and is economical and environmentally friendly.

[0006] This utility model discloses a protective boiler tube for a circulating fluidized bed, comprising a boiler tube, a plurality of first arc-shaped protective plates uniformly fixedly installed on the outer wall surface of the boiler tube, a second protective plate uniformly fixedly installed on the outer wall surface of the boiler tube, and fixing strips uniformly fixedly installed between the plurality of first arc-shaped protective plates.

[0007] The first and second arc-shaped protective plates are fixedly installed on the outer wall of the boiler tubes. They prevent direct contact between air bubbles in the boiler furnace and the outer wall of the boiler tubes, reducing the impact of air bubble tail vortex particles on the outer wall of the boiler tubes. They also eliminate the periodic air gap phenomenon on the outer wall of the boiler tubes and the resulting hammering effect, effectively protecting the outer wall of the boiler tubes and providing stable support for the protection of other structures. At the same time, the arc-shaped design can prevent deformation of the boiler tubes caused by long-term high-temperature environment, effectively preventing deformation of the boiler tubes and affecting normal operation. This arc-shaped design can provide comprehensive protection for the outer wall of the boiler tubes, and saves raw materials, making it economical and environmentally friendly. It is especially suitable for refractory and wear-resistant castable layers that are fixedly connected to only one side wall of the boiler tubes.

[0008] A refractory and wear-resistant castable layer is fixedly connected to one side wall of the boiler buried pipe. The refractory and wear-resistant castable layer is located on one side wall of the boiler buried pipe, within the grid between the first arc-shaped protective plate and the fixing strip.

[0009] A refractory and wear-resistant castable layer is fixedly connected to one side wall of the boiler's buried tubes, located at the front row of buried tubes near the boiler's fire end. Through the covering and protection of the refractory and wear-resistant castable, direct high-temperature burning and impact from high-temperature material particles in the boiler furnace on the outer wall of the front row of buried tubes near the fire end can be avoided, thus protecting the tubes and effectively solving the problem of large annual thinning and short service life of the tube walls. The refractory and wear-resistant castable layer is located within the grid between the first arc-shaped protective plate and the fixing strip, providing reinforcement and enhancing its durability. The refractory and wear-resistant castable layer is more firmly fixed, and the fixing strips can improve the strength of the outer wall of the boiler buried tubes. Together with the first arc-shaped protective plate and the second protective plate, a solid protective net can be formed on the outer wall of the boiler buried tubes. In combination with the refractory and wear-resistant castable layer, it can provide better protection for the outer wall of the front row of buried tubes near the fire end of the boiler, which will greatly improve the service life of the front row of buried tubes near the fire end of the boiler. It avoids the problem of sudden tube rupture safety accidents caused by cracks due to the sudden drop in the wall thickness of the front row of buried tubes near the fire end of the boiler.

[0010] A V-shaped anchoring strip is fixedly connected within the grid between the first arc-shaped protective plate and the fixing strip. The V-shaped anchoring strip is located on the outer wall surface of the refractory and wear-resistant castable layer.

[0011] The V-shaped anchoring strip consists of two steel plates with their openings facing upwards. The included angle between the two steel plates is 15°-30°, and a plug is fixedly connected at the intersection of the two steel plates.

[0012] Multiple V-shaped anchoring strips are installed on the outer wall of the refractory and wear-resistant castable layer. These strips reinforce the refractory and wear-resistant castable layer, effectively preventing it from falling off due to high-temperature baking after prolonged use. This further extends the service life of the refractory and wear-resistant castable layer, and consequently, the service life of the boiler's near-fire end front-row buried pipes, resulting in an economical and environmentally friendly system. The V-shaped anchoring strips can be fixed to the surface of the boiler's buried pipes using insert rods. The V-shape provides stable support for the refractory and wear-resistant castable layer, preventing it from falling off and extending its service life, thus extending the service life of the entire system – an economical and environmentally friendly system.

[0013] The bottom edge of the second protective sheet is flush with the bottom surface of the second protective sheet.

[0014] The beneficial effects of this utility model are:

[0015] 1) The first arc-shaped protective plate and the second protective plate are fixedly installed on the outer wall of the boiler tube. They can prevent the direct contact between the air bubbles in the boiler furnace and the outer wall of the boiler tube, reduce the impact of the air bubble tail vortex particles in the boiler furnace on the outer wall of the boiler tube, eliminate the periodic air gap phenomenon on the outer wall of the boiler tube and the resulting hammering effect, effectively protect the outer wall of the boiler tube, and provide stable support for the protection of other structures. At the same time, the arc-shaped structure design can prevent the deformation of the boiler tube caused by long-term high temperature environment, effectively prevent the deformation of the boiler tube from affecting normal operation. This arc-shaped structure design can provide comprehensive protection for the outer wall of the boiler tube, and save raw materials, which is economical and environmentally friendly. It is especially suitable for refractory and wear-resistant castable layers that are fixedly connected to only one side wall of the boiler tube.

[0016] 2) A refractory and wear-resistant castable layer is fixedly connected to one side wall of the boiler's buried tubes, located at the front row of buried tubes near the boiler's fire end. Through the covering and protection of the refractory and wear-resistant castable, direct high-temperature burning and impact from high-temperature material particles in the boiler furnace on the outer wall of the front row of buried tubes near the fire end can be avoided, thus protecting the tubes and effectively solving the problem of large annual thinning and short service life of the tube walls. The refractory and wear-resistant castable layer is located within the grid between the first arc-shaped protective plate and the fixing strip, providing reinforcement. The refractory and wear-resistant castable layer is more firmly fixed, and the fixing strips can improve the strength of the outer wall of the boiler buried tubes. Together with the first arc-shaped protective plate and the second protective plate, a solid protective net can be formed on the outer wall of the boiler buried tubes. In conjunction with the refractory and wear-resistant castable layer, it can provide better protection for the outer wall of the front row of buried tubes near the fire end of the boiler, which will greatly improve the service life of the front row of buried tubes near the fire end of the boiler. It avoids the problem of sudden tube rupture safety accidents caused by cracks due to the sudden drop in the wall thickness of the front row of buried tubes near the fire end of the boiler.

[0017] 3) Multiple V-shaped anchoring strips are installed on the outer wall of the refractory and wear-resistant castable layer. These strips reinforce the refractory and wear-resistant castable layer, effectively preventing it from falling off due to high-temperature baking after prolonged use. This further extends the service life of the refractory and wear-resistant castable layer, and consequently extends the service life of the front row of buried pipes near the boiler fire end, making it economical and environmentally friendly. The V-shaped anchoring strips can be fixed to the surface of the boiler buried pipes by inserting rods. The V-shape provides stable support for the refractory and wear-resistant castable layer, preventing it from falling off and extending its service life. This, in turn, extends the service life of the entire device, making it economical and environmentally friendly.

[0018] 4) This device has a low cost, is reliable in use, and has a simple implementation process. It effectively solves the problem of short service life of the front row of buried tubes at the near-fire end of the boiler, which restricts the continuous operation of the boiler. Using this technology will greatly improve the service life of the front row of buried tubes at the near-fire end of the boiler and avoid the problem of sudden tube rupture safety accidents caused by cracks due to the sudden drop in the wall thickness of the front row of buried tubes at the near-fire end of the boiler below the limit value. Attached Figure Description

[0019] Figure 1 This is the front view of the present invention;

[0020] Figure 2 This is a rear view of the present invention;

[0021] Figure 3 This is a front view of the installation of the boiler embedded tube, the first arc-shaped protective plate, and the second protective plate in this utility model;

[0022] Figure 4This is a rear view of the boiler embedded tube, the first arc-shaped protective plate, and the second protective plate installed in this utility model.

[0023] Figure 5 This is a schematic diagram of the boiler embedded tube structure in this utility model;

[0024] Figure 6 This is a schematic diagram of the V-shaped anchoring strip in this utility model.

[0025] In the diagram: 1. Boiler embedded pipe; 2. First arc-shaped protective plate; 3. Second protective plate; 4. Fixing strip; 5. V-shaped anchoring strip; 6. Insert rod; 7. Refractory and wear-resistant castable layer. Detailed Implementation

[0026] Example 1

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] This utility model includes a boiler embedded tube 1, a first arc-shaped protective plate 2, a second protective plate 3, a fixing strip 4, and a refractory and wear-resistant castable layer 6. The specific structure includes a boiler embedded tube 1, with multiple first arc-shaped protective plates 2 uniformly fixedly installed on the outer wall surface of the boiler embedded tube 1, and second protective plates 3 uniformly fixedly installed on the outer wall surface of the boiler embedded tube 1. Fixing strips 4 are uniformly fixedly installed between the multiple first arc-shaped protective plates 2.

[0029] A refractory and wear-resistant castable layer 6 is fixedly connected to one side wall of the boiler buried pipe 1. The refractory and wear-resistant castable layer 6 is located on one side wall of the boiler buried pipe 1, within the grid between the first arc-shaped protective plate 2 and the fixing strip 4.

[0030] The bottom edge of the second protective sheet 3 is flush with the bottom surface of the second protective sheet 3.

[0031] The fixing strip 4 is made of stainless steel, with a diameter of 8mm, a spacing of 10mm between each fixing strip 4, and a length of 500mm.

[0032] The first arc-shaped protective plate 2 and the second protective plate 3 are made of stainless steel.

[0033] The refractory and wear-resistant castable layer 6 is made of phosphate refractory and wear-resistant castable, with a thickness of 30mm and a length and width of 500mm.

[0034] Instructions for use: A first arc-shaped protective plate 2 and a second protective plate 3 are welded to the outer wall of the boiler buried tube 1. After cleaning the dust from the surface of the first arc-shaped protective plate 2 and the second protective plate 3, a fixing strip 4 is welded between the first arc-shaped protective plate 2 and the second protective plate 3. The refractory and wear-resistant castable layer 6 is located on one side wall of the boiler buried tube 1, that is, at the position of the front row of buried tubes near the fire end of the boiler, within the grid between the first arc-shaped protective plate 2 and the fixing strip 4. The refractory and wear-resistant castable layer 6 is tamped with a rubber mallet until it is flat and slurry is produced. After tamping, it is left to stand until the refractory and wear-resistant castable layer 6 is completely solidified. Through the protection of the refractory and wear-resistant castable layer 6, the high-temperature material particles in the furnace can be prevented from directly burning and impacting the outer wall of the front row of buried tubes near the fire end of the boiler. This can effectively solve the problem of large annual thinning of the tube wall and short service life of the front row of buried tubes near the fire end of the boiler.

[0035] Example 2

[0036] This utility model includes a boiler embedded pipe 1, a first arc-shaped protective plate 2, a second protective plate 3, a fixing strip 4, a V-shaped anchoring strip 5, an insert rod 501, and a fire-resistant and wear-resistant castable layer 6. The specific structure includes a boiler embedded pipe 1, with multiple first arc-shaped protective plates 2 uniformly fixedly installed on the outer wall surface of the boiler embedded pipe 1, and second protective plates 3 uniformly fixedly installed on the outer wall surface of the boiler embedded pipe 1. Fixing strips 4 are uniformly fixedly installed between the multiple first arc-shaped protective plates 2.

[0037] A refractory and wear-resistant castable layer 6 is fixedly connected to one side wall of the boiler buried pipe 1. The refractory and wear-resistant castable layer 6 is located on one side wall of the boiler buried pipe 1, within the grid between the first arc-shaped protective plate 2 and the fixing strip 4.

[0038] A V-shaped anchoring strip 5 is fixedly connected within the grid between the first arc-shaped protective plate 2 and the fixing strip 4. The V-shaped anchoring strip 5 is located on the outer wall surface of the refractory and wear-resistant castable layer 6.

[0039] The V-shaped anchoring strip 5 is composed of two steel plates with the opening direction facing upward. The included angle between the two steel plates is 15°-30°, and a plug rod 501 is fixedly connected at the intersection of the two steel plates.

[0040] The bottom edge of the second protective sheet 3 is flush with the bottom surface of the second protective sheet 3.

[0041] The fixing strip 4 is made of stainless steel, with a diameter of 8mm, a spacing of 10mm between each fixing strip 4, and a length of 500mm.

[0042] The first arc-shaped protective plate 2, the second protective plate 3, and the V-shaped anchoring strip 5 are made of stainless steel.

[0043] The refractory and wear-resistant castable layer 6 is made of phosphate refractory and wear-resistant castable, with a thickness of 30mm and a length and width of 500mm.

[0044] Instructions for use: A first arc-shaped protective plate 2 and a second protective plate 3 are welded to the outer wall of the boiler tube 1. After cleaning the dust from the surfaces of the first arc-shaped protective plate 2 and the second protective plate 3, a fixing strip 4 is welded between the first arc-shaped protective plate 2 and the second protective plate 3. The refractory and wear-resistant castable layer 6 is located on one side wall of the boiler tube 1, i.e., at the position of the front row of tubes near the fire end of the boiler. Drill holes in the outer wall of the boiler tube 1, within the grid between the first arc-shaped protective plate 2 and the fixing strip 4. Use a rubber mallet to tamp the covered refractory and wear-resistant castable layer 6 until it is flat and slurry is produced. Let it stand until the covered refractory and wear-resistant layer is fully tamped. Once the refractory and wear-resistant refractory layer 6 has completely solidified, the covering and protection provided by the refractory and wear-resistant refractory layer 6 can prevent high-temperature material particles in the furnace from directly burning and impacting the outer wall of the front row of buried pipes near the boiler's fire end, thus protecting the buried pipes near the fire end. After the covering refractory and wear-resistant refractory layer 6 has dried, the insert rod 501 set on the V-shaped anchoring strip 5 can be inserted into the drilled hole on the outer wall of the buried pipe 1. The refractory and wear-resistant refractory layer 6 can effectively solve the problem of large annual thinning of the pipe wall and short service life of the front row of buried pipes near the fire end of the boiler, extend the boiler's operating cycle, and improve the boiler's operational stability.

[0045] The V-shaped anchoring strip 5, located on the outer wall of the refractory and wear-resistant castable layer 6, reinforces the refractory and wear-resistant castable layer 6, effectively preventing it from falling off due to high-temperature baking after prolonged use. This further extends the service life of the refractory and wear-resistant castable layer 6, and consequently, the service life of the front-row buried pipes near the boiler's fire end, making it economical and environmentally friendly. The V-shaped anchoring strip can be fixed to the surface of the boiler's buried pipes using the insertion rod 501. The V-shape provides stable support for the refractory and wear-resistant castable layer, preventing it from falling off and extending its service life, thus extending the service life of the entire device, making it economical and environmentally friendly.

Claims

1. A protective boiler tube for a circulating fluidized bed, characterized in that: The boiler includes a buried pipe (1), on which multiple first arc-shaped protective plates (2) are uniformly fixedly installed on the outer wall surface, and second protective plates (3) are uniformly fixedly installed on the outer wall surface, and fixing strips (4) are uniformly fixedly installed between the multiple first arc-shaped protective plates (2).

2. A protective boiler tube for a circulating fluidized bed as described in claim 1, characterized in that: A refractory and wear-resistant castable layer (6) is fixedly connected to one side wall of the boiler buried pipe (1). The refractory and wear-resistant castable layer (6) is located on one side wall of the boiler buried pipe (1), in the grid between the first arc-shaped protective plate (2) and the fixing strip (4).

3. A protective boiler tube for a circulating fluidized bed as described in claim 2, characterized in that: A V-shaped anchoring strip (5) is fixedly connected in the grid between the first arc-shaped protective plate (2) and the fixing strip (4). The V-shaped anchoring strip (5) is located on the outer wall surface of the refractory and wear-resistant castable layer (6).

4. A protective boiler tube for a circulating fluidized bed as described in claim 3, characterized in that: The V-shaped anchoring strip (5) is composed of two steel plates with the opening direction facing upward. The included angle between the two steel plates is 15°-30°. A plug rod (501) is fixedly connected at the intersection of the two steel plates.

5. A protective boiler tube for a circulating fluidized bed as described in claim 4, characterized in that: The bottom edge of the second protective sheet (3) is flush with the bottom surface of the second protective sheet (3).

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