Heat insulation structure of heating furnace tube outer wall temperature measuring element

Abstract

The utility model relates to a heat insulation structure of a temperature measuring element on the outer wall of a furnace tube of a heating furnace, which is a heat insulation structure for ensuring that a certain space is not influenced by other heat sources in a coke tower in the working process of the petrochemical coke tower. The device mainly comprises a fixing device, an asbestos layer 8, an outer powdery aluminum oxide layer 2, an outer high-temperature glue layer 7, a high-temperature-resistant stainless steel metal layer 6, an inner high-temperature glue layer 5 and an inner powdery aluminum oxide layer 3. All the heat insulation material layers are organically matched to form a multi-layer heat insulation layer, so that the multi-layer heat insulation layer can effectively insulate outside heat in an environment with the temperature of 600 DEG C or above. And the heat insulation layer can be matched with other systems by processing the shape of the high-temperature-resistant stainless steel metal layer, so that the heat insulation layer is only influenced by heat of a certain surface or several surfaces, and the working efficiency of the matched system can be obviously improved.

Description

Technical Field

[0001] This utility model relates to a heat insulation structure for a temperature measuring element on the outer wall of a heating furnace tube, belonging to the field of heat insulation technology. Specifically, it is a structure that organically combines multiple heat insulation material layers to effectively isolate heat, especially in the process of working in a petrochemical coke tower where it is necessary to ensure that a certain space is not affected by other heat sources inside the coke tower. Background Technology

[0002] Currently, thermal insulation plays a crucial role in engineering and applications as an important component across various fields. In the petrochemical industry, effective thermal insulation design protects equipment from external temperature fluctuations and prevents overheating or cooling, thus extending equipment lifespan and improving efficiency. However, in practical applications, the selection of insulation materials, thermal effects, installation methods, and environmental adaptability are all factors that must be fully considered when designing insulation layers. Improper design can lead to decreased insulation performance and even safety hazards. Therefore, designing a high-performance insulation structure to improve equipment performance has become a challenge for petrochemical companies. Common insulation methods include selecting insulation materials, applying insulating coatings, and external wall insulation. Using high-efficiency insulation materials is one of the most common heat insulation methods, but in high-temperature conditions, choosing only high-efficiency insulation materials is not enough to achieve effective heat insulation. Heat insulation coatings are materials applied to surfaces to reduce heat absorption and conduction, but the application of these coatings requires high technical skills and professional construction personnel to ensure uniform application and effective performance. External wall insulation refers to adding a heat insulation layer, such as external wall insulation boards, to the surface of building exterior walls, which can effectively reduce heat conduction through the building exterior walls. However, it only isolates external heat and does not affect heat transfer within the building. Furthermore, due to the large surface area of ​​the building, its implementation cost is also high. The internal conditions of petrochemical coke towers are complex. Most monitoring systems, while monitoring coke oven tubes, need to shield the heat emitted by other furnace tubes. Coke oven tubes are used in high-temperature reactors and heating equipment. These pipes can withstand high temperatures to ensure the safe and efficient operation of chemical production processes. Therefore, the health status of coke oven tubes must be monitored in real time. However, interference from external heat sources such as heating furnaces during the testing process can affect the actual monitoring results and consequently the safety of the entire coke tower. Therefore, it is essential to ensure that the coke oven tubes are unaffected by external heat sources while the monitoring system is monitoring them in order to accurately assess their health status. Thus, the design of the insulation layer for external heat sources on the coke oven tubes is crucial.

[0003] Currently, there are several methods for heat insulation:

[0004] 1. Man Yuanli (Man Yuanli. Quantitative Analysis of Energy Consumption Reduction Effect of Nanomaterials in Preheaters [J]. Cement, 2024, (05): 48-50.) proposed a heat insulation method. He theoretically calculated and compared the heat dissipation of the outer surface when using calcium silicate board and nanoboard in the inner heat insulation layer, respectively, and quantitatively analyzed the energy consumption reduction effect of nanomaterials. However, the price of nanomaterials is higher than that of traditional materials, and the cost is large. It is not suitable for large-area application scenarios. In addition, the heat insulation performance and durability of nanomaterials will be affected under high temperature application conditions. Furthermore, some nanomaterials may experience performance degradation or material damage due to environmental factors during long-term use. Some nanomaterials may also release harmful substances during operation, posing potential risks to the environment and health.

[0005] 2. Zhang Zhongli (Zhang Zhongli, Zhou Lixin, Hu Jinhua. Thermal protection method of multilayer thermal insulation materials [J]. Rocket Propulsion, 2023, 49(02): 51-56.) proposed a thermal insulation method that uses high-temperature resistant thermal insulation oxide ceramics, aluminum silicate fiber and flame-retardant silicone rubber to form a planar thermal insulation board, which can effectively insulate heat; however, the fiber thermal insulation material determines that it can only be made into a simple planar or arc-shaped thermal insulation material, and cannot change its shape according to external conditions, so its shape adaptability with other systems is not high. In addition, the cost of this planar thermal insulation board is too high, which will reduce the economy in many industrial applications.

[0006] Currently, there are many heat insulation methods available, but most of them rely on designing a high-cost heat-resistant material to achieve the purpose of heat insulation. Their application costs are high, and the manufacturing process is difficult, thus hindering their widespread use. Furthermore, other multi-layered heat insulation materials have a simple structural design and cannot be adapted to specific application environments. Utility Model Content

[0007] To address the aforementioned problems, this invention proposes a heat insulation structure for the temperature sensing element on the outer wall of a heating furnace tube. This structure comprises multiple layers of different heat insulation materials organically combined to form a multi-layered insulation layer. This structure not only allows operation in high-temperature environments but also offers low cost, ease of installation, and flexible design, enabling highly efficient heat insulation of specific local spaces within a coke tower. Furthermore, integrating this insulation structure with other systems can significantly extend the system's lifespan and improve its overall performance.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0009] A heat insulation structure for a temperature sensing element on the outer wall of a heating furnace tube, characterized in that:

[0010] It mainly includes a fixing device, an asbestos layer 8, an outer powdered alumina layer 2, an outer high-temperature adhesive layer 7, a high-temperature resistant stainless steel metal layer 6, an inner high-temperature adhesive layer 5, and an inner powdered alumina layer 3.

[0011] A layer of asbestos 8 is laid as the first insulation layer;

[0012] On the inner surface of the first heat insulation layer, a high-temperature adhesive is first coated and then powdered alumina is coated to form an outer powdered alumina layer 2 as the second heat insulation layer.

[0013] After coating the inner surface of the second heat insulation layer with the outer high-temperature adhesive layer 7, the high-temperature resistant stainless steel metal layer 6 is bonded as the third heat insulation layer.

[0014] After coating the inner surface of the third heat insulation layer with the inner high-temperature adhesive layer 5, powdered alumina is then coated to form the inner powdered alumina layer 3 as the fourth heat insulation layer; the composite structure of the four heat insulation layers constitutes the heat insulation structure; the heat insulation structure is bent into a U-shape, and the monitoring system placement space 4 is formed in the center of the fourth heat insulation layer, and the monitoring system is placed inside.

[0015] The heat insulation structure of the temperature measuring element on the outer wall of the furnace tube of the heating furnace is described above, wherein the high-temperature resistant stainless steel metal layer is a 06Cr25Ni20 stainless steel metal layer.

[0016] The heat insulation structure of the temperature measuring element on the outer wall of the furnace tube of the heating furnace is described above, wherein: the high-temperature adhesive layer is an AB type high-temperature adhesive layer.

[0017] The aforementioned heat insulation structure for a temperature measuring element on the outer wall of a heating furnace tube includes: multiple repeated arrangements and combinations of various heat insulation layers;

[0018] Alternatively, the second and third insulation layers can be combined and repeated, and then connected with AB-type high-temperature adhesive.

[0019] The heat insulation structure of the temperature measuring element on the outer wall of the furnace tube of the heating furnace is described above, wherein: the fixing device includes steel bar 9 and steel plate 1 for restricting the horizontal movement of the sensor.

[0020] The heat insulation structure of the temperature measuring element on the outer wall of the furnace tube of the heating furnace is described above, wherein: multiple steel bars 9 are provided.

[0021] The steel plate 1 is bent in a shape corresponding to the heat insulation structure and is fastened to the outside of the heat insulation structure. The heat insulation structure is then fixed to the furnace tube 11 of the heating furnace by means of tie-up straps and bolts by means of connecting holes provided on the steel bars 9; or fixed to the inner surface of the coke tower.

[0022] The aforementioned heat insulation structure for a temperature measuring element on the outer wall of a heating furnace tube, wherein: the monitoring system is a temperature measuring element.

[0023] The aforementioned heat insulation structure for a temperature sensing element on the outer wall of a heating furnace tube, wherein the temperature sensing element is a high-temperature sensor.

[0024] This utility model has the following beneficial technical effects:

[0025] This invention organically combines multiple layers of insulation materials to form a multi-layer insulation structure that can still function normally at 600℃. It features low cost, high plasticity, high heat resistance and insulation, a wide operating temperature range, and low thermal efficiency. Compared to traditional insulation methods, it reduces economic costs and solves the problem of most insulation methods being heavily restricted by environmental conditions. By isolating other heat sources, the internal monitoring system can measure more accurate data and significantly extend its lifespan. Furthermore, compared to other insulation designs, this invention requires no subsequent maintenance, greatly reducing the workload for staff. Attached Figure Description

[0026] Figure 1 Here is a schematic diagram of the cross-sectional structure of this utility model:

[0027] Figure 2 This is an exploded structural diagram of some components of this utility model:

[0028] Figure 3 Here is a schematic diagram of the steel bar structure of this utility model:

[0029] Explanation of the attached figures: 1. Steel plate; 2. Outer layer of powdered alumina; 3. Inner layer of powdered alumina; 4. Space for monitoring system placement; 5. Inner layer of high-temperature adhesive; 6. High-temperature resistant stainless steel metal layer; 7. Outer layer of high-temperature adhesive; 8. Asbestos layer; 9. Steel bar; 10. High-temperature sensor; 11. Furnace tube. Detailed Implementation

[0030] See Figure 1As shown, inside a petrochemical coke tower, a heat insulation structure for a temperature measuring element on the outer wall of a heating furnace tube, according to this invention, is installed. It mainly includes a steel plate 1 for fixing the device, an outer layer of powdered alumina 2, an inner layer of powdered alumina 3, an inner high-temperature adhesive layer 5, a high-temperature resistant stainless steel metal layer 6, an outer high-temperature adhesive layer 7, and an asbestos layer 8. The asbestos layer serves as the first heat insulation layer, the high-temperature adhesive surface coated with powdered alumina serves as the second heat insulation layer, the high-temperature resistant stainless steel metal layer serves as the third heat insulation layer, and the high-temperature adhesive surface coated with powdered alumina again serves as the fourth heat insulation layer. The temperature generated by the external heat source is sequentially isolated by the first to fourth heat insulation layers, allowing the monitoring system in the placement space 4 to monitor the open surfaces of the heat insulation structure, thus obtaining more accurate data.

[0031] The specific embodiments of this utility model are further explained below with reference to the accompanying drawings:

[0032] See Figure 1 As shown, the present invention provides a heat insulation structure for a temperature measuring element on the outer wall of a heating furnace tube, which mainly includes, from the outside to the inside, a fixing device, an asbestos layer 8, an outer powdered alumina layer 2, an outer high-temperature adhesive layer 7, a high-temperature resistant stainless steel metal layer 6, an inner high-temperature adhesive layer 5, and an inner powdered alumina layer 3.

[0033] A layer of asbestos 8 is laid as the first insulation layer;

[0034] On the inner surface of the first heat insulation layer, a high-temperature adhesive is first coated and then powdered alumina is coated to form an outer powdered alumina layer 2 as the second heat insulation layer.

[0035] After coating the inner surface of the second heat insulation layer with the outer high-temperature adhesive layer 7, the high-temperature resistant stainless steel metal layer 6 is bonded as the third heat insulation layer.

[0036] After coating the inner surface of the third insulation layer with the inner high-temperature adhesive layer 5, powdered alumina is then coated to form the inner powdered alumina layer 3, which serves as the fourth insulation layer. The composite structure of these four insulation layers constitutes the insulation structure. This insulation structure is bent into a U-shape, with the monitoring system placement space 4 located within the central fourth insulation layer. Through this organically combined insulation design of the four insulation layers, the purpose of stably isolating external heat is achieved.

[0037] The high-temperature resistant stainless steel metal layer is 06Cr25Ni20 stainless steel, which has excellent high-temperature resistance and is not easily deformed or faded at high temperatures, with a maximum service temperature of up to 1200℃. Furthermore, 06Cr25Ni20 stainless steel has high corrosion resistance and can resist the erosion of chemical substances inside petrochemical coking towers.

[0038] The aforementioned AB-type high-temperature adhesive is SL8306 adhesive, which is flame-retardant, heat-resistant, and easy to use. Its operating temperature range is -40 to 1500℃.

[0039] The aforementioned asbestos insulation material is a natural fibrous silicate mineral. The fiber bundles are composed of very long and thin fibers that can be separated from each other. These characteristics enable the asbestos layer to maintain high strength and rigidity even under high temperature environments, thereby effectively preventing heat conduction.

[0040] The high-temperature adhesive surface is coated with powdered alumina by thoroughly mixing AB-type high-temperature adhesive in a ratio of A:B = 1:2, and then completely covering the surface layer of the mixed high-temperature adhesive with powdered alumina. This ensures that the powdered alumina does not fall off and also serves to insulate against heat.

[0041] The high-temperature resistant stainless steel metal layer has a highly malleable shape, and its surface is not limited to a flat or arc surface. It can be processed into the required shape according to needs while maintaining its heat insulation effect. Therefore, it has high compatibility when used with other equipment.

[0042] The aforementioned insulation system can be nested multiple times, with the second and third insulation layers repeatedly overlapping, and can be connected with high strength using AB-type high-temperature adhesive, thereby further improving the insulation effect.

[0043] The fixing device consists of a steel plate 1 and steel bars 9 with holes at both ends. The steel plate 1 has a bending shape corresponding to the heat insulation structure and is fastened to the outside of the heat insulation structure. The steel plate 1 restricts the outward expansion of asbestos and constrains the horizontal movement of the sensor. The steel bars are bolted to the furnace tube by means of steel bar straps, or the steel bars can be directly fixed to the inner surface of the coke tower by bolting through the through holes at both ends. The temperature measuring element of the monitoring system is a high-temperature sensor.

Claims

1. A heat insulation structure for a temperature sensing element on the outer wall of a heating furnace tube, characterized in that: It mainly includes a fixing device, an asbestos layer (8), an outer powdered alumina layer (2), an outer high-temperature adhesive layer (7), a high-temperature resistant stainless steel metal layer (6), an inner high-temperature adhesive layer (5), and an inner powdered alumina layer (3). Lay a layer of the aforementioned asbestos (8) as the first insulation layer; On the inner surface of the first heat insulation layer, a high-temperature adhesive is first coated and then powdered alumina is coated to form an outer powdered alumina layer (2) as the second heat insulation layer. After coating the inner surface of the second heat insulation layer with the outer high-temperature adhesive layer (7), the high-temperature resistant stainless steel metal layer (6) is bonded as the third heat insulation layer; After coating the inner surface of the third heat insulation layer with the inner high-temperature adhesive layer (5), powdered alumina is then coated to form the inner powdered alumina layer (3) as the fourth heat insulation layer; the composite structure of the above four heat insulation layers constitutes the heat insulation structure; the heat insulation structure is bent into a U-shape, and the monitoring system placement space (4) is formed in the center of the fourth heat insulation layer, and the monitoring system is placed inside.

2. The heat insulating structure of a temperature measuring element for the outer wall of a furnace tube of a heating furnace according to claim 1, characterized in that: The high-temperature resistant stainless steel metal layer is a 06Cr25Ni20 stainless steel metal layer.

3. The heat insulating structure of a temperature measuring element for the outer wall of a furnace tube of a heating furnace according to claim 1, characterized in that: The high-temperature adhesive layer is an AB type high-temperature adhesive layer.

4. The heat insulating structure of a temperature measuring element for the outer wall of a furnace tube of a heating furnace according to claim 1, characterized in that: Each insulation layer is repeatedly arranged and combined; or the second and third insulation layers are repeatedly arranged and connected by AB-type high-temperature adhesive.

5. The heat insulating structure of a temperature measuring element for the outer wall of a furnace tube of a heating furnace according to claim 1, characterized in that: The fixing device includes a steel bar (9) and a steel plate (1) that restricts the horizontal movement of the sensor.

6. A heat shield structure for a temperature measuring element on the outer wall of a furnace tube of a heating furnace as defined in claim 5, characterized in that: Multiple steel bars (9) are provided.

7. The heat shield structure for a temperature measuring element on the outer wall of a furnace tube of a heating furnace according to claim 5, characterized in that: The steel plate (1) is bent in a shape corresponding to the heat insulation structure and is fastened to the outside of the heat insulation structure. The steel bars (9) are then tied together by cable ties. The heat insulation structure is fixed to the furnace tube (11) of the heating furnace by bolting through connecting holes on the steel bars (9); or it is fixed to the inner surface of the coke tower.

8. The heat shield structure for a temperature measuring element on the outer wall of a furnace tube of a heating furnace according to claim 1, characterized in that: The monitoring system is a temperature measuring element.

9. The heat shield structure for a temperature measuring element on the outer wall of a furnace tube of a heating furnace according to claim 8, characterized in that: The temperature sensing element is a high-temperature sensor.

Images