A refractory lining structure for a hydrogen-based shaft furnace high-temperature gas duct
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOSTEEL LUOYANG INSTITUTE OF REFRACTORIES RESEARCH CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-08-07
AI Technical Summary
[0002]在氢基竖炉生产过程中，高温气体管道需承受高温、还原气体腐蚀等复杂工况；传统的耐火衬里结构存在隔热性能不足、耐腐蚀性差、使用寿命短等问题，导致管道易损坏，影响生产连续性，且维修成本高；在高温还原气体环境下耐火材料中的氧化物易被还原发生质变，降低隔热效果，甚至破损可能引发管道超温，造成管道泄漏等安全隐患；因此，亟需一种性能优异的耐火衬里结构来满足氢基竖炉高温气体管道的使用要求
[0008]This utility model proposes a refractory lining structure suitable for high-temperature gas pipelines in hydrogen-based vertical furnaces. Using the above-mentioned technical solution, a high-temperature anti-corrosion coating forms a dense protective film in a high-temperature and reducing gas environment, preventing corrosive media from contacting the pipeline shell. Insulating castable fills the pipeline shell, utilizing its low thermal conductivity to reduce heat transfer. The soft insulating fiber paper adheres tightly to the outer wall of the pipeline bricks, reducing heat loss. The interlocking convex and concave structures of the pipeline bricks, with approximately 2mm of refractory mortar filling between layers, prevent longitudinal displacement during the thermal expansion and contraction of the high-temperature shell from damaging the pipeline, ensuring the integrity of the lining structure.
Smart Images
Figure CN224607312U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of hydrogen-based vertical furnaces, specifically to a refractory lining structure suitable for high-temperature gas pipelines in hydrogen-based vertical furnaces, used to ensure the stability and safety of high-temperature gas pipelines during the transport of reducing gas. Background Technology
[0002] In the production process of hydrogen-based vertical shaft furnaces, high-temperature gas pipelines need to withstand complex conditions such as high temperatures and corrosion from reducing gases. Traditional refractory lining structures have problems such as insufficient heat insulation performance, poor corrosion resistance, and short service life, which makes the pipelines prone to damage, affecting the continuity of production and resulting in high maintenance costs. In the high-temperature reducing gas environment, the oxides in the refractory materials are easily reduced and undergo qualitative changes, reducing the heat insulation effect, and even damage may cause the pipeline to overheat, resulting in pipeline leaks and other safety hazards. Therefore, there is an urgent need for a high-performance refractory lining structure to meet the usage requirements of high-temperature gas pipelines in hydrogen-based vertical shaft furnaces. Utility Model Content
[0003] The purpose of this invention is to provide a refractory lining structure suitable for high-temperature gas pipelines in hydrogen-based vertical shaft furnaces, which can improve the heat insulation and corrosion resistance of high-temperature gas pipelines, extend the service life of pipelines, ensure the stable operation of hydrogen-based vertical shaft furnace production, and reduce maintenance costs.
[0004] To achieve the above objectives, this utility model adopts the following technical solution: A refractory lining structure suitable for high-temperature gas pipelines in hydrogen-based vertical shaft furnaces is disclosed. The refractory lining structure is disposed on the inner wall surface of the gas pipeline shell. The refractory lining structure has a stabilizing layer for enhancing structural stability and sealing, which is composed of multiple interlocking pipe bricks. A layer of heat-insulating refractory fiber paper is wrapped around the outside of the stabilizing layer. The heat-insulating refractory fiber paper forms a first heat-insulating layer. An heat-insulating castable material constituting a second heat-insulating layer is disposed on the outside of the first heat-insulating layer. A high-temperature anti-corrosion coating that effectively resists the corrosion of reducing gases is coated on the outside of the second heat-insulating layer, and the high-temperature anti-corrosion coating is coated on the inner wall surface of the gas pipeline shell. The stabilizing layer, heat-insulating refractory fiber paper, heat-insulating castable material, and high-temperature anti-corrosion coating are disposed from the inside to the outside on the inner wall surface of the gas pipeline shell.
[0005] The aforementioned thermal insulation castable is fixed by anchors welded to the inner wall of the gas pipeline shell.
[0006] The heat-insulating and fire-resistant fiber paper is wrapped in plastic film at the factory to prevent the fiber paper from getting damp and damaged during the pouring construction, thus reducing the heat insulation effect.
[0007] The joints between the pipe bricks are filled with 2mm of refractory mortar.
[0008] This utility model proposes a refractory lining structure suitable for high-temperature gas pipelines in hydrogen-based vertical furnaces. Using the above-mentioned technical solution, a high-temperature anti-corrosion coating forms a dense protective film in a high-temperature and reducing gas environment, preventing corrosive media from contacting the pipeline shell. Insulating castable fills the pipeline shell, utilizing its low thermal conductivity to reduce heat transfer. The soft insulating fiber paper adheres tightly to the outer wall of the pipeline bricks, reducing heat loss. The interlocking convex and concave structures of the pipeline bricks, with approximately 2mm of refractory mortar filling between layers, prevent longitudinal displacement during the thermal expansion and contraction of the high-temperature shell from damaging the pipeline, ensuring the integrity of the lining structure. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the structure of this utility model.
[0010] Figure 2 This is a cross-sectional view of the structure of this utility model.
[0011] In the diagram: 1. Stabilizing layer, 2. Thermal insulation and fire-resistant fiber paper, 3. Thermal insulation castable, 4. High-temperature anti-corrosion coating, 5. Gas pipeline shell. Detailed Implementation
[0012] The present invention will be described in detail with reference to the accompanying drawings and specific embodiments: like Figure 1 As shown, a refractory lining structure suitable for high-temperature gas pipelines in hydrogen-based vertical shaft furnaces is provided on the inner wall surface of the gas pipeline shell 5. The refractory lining structure has a stabilizing layer 1 to enhance structural stability and sealing, the stabilizing layer being composed of multiple interlocking pipe bricks. A layer of heat-insulating refractory fiber paper 2 is wrapped around the outside of the stabilizing layer 1; the heat-insulating refractory fiber paper 2 forms a first insulation layer; the heat-insulating fiber paper is soft and can tightly adhere to the outer wall of the pipe bricks, reducing heat loss; a second insulation layer is provided on the outside of the first insulation layer. The insulation layer consists of an insulating castable 3; the insulating castable 3 is filled inside the pipe shell, utilizing its low thermal conductivity to reduce heat transfer; the outer side of the second insulation layer is coated with a high-temperature anti-corrosion coating 4 that effectively resists the corrosion of reducing gases, and the high-temperature anti-corrosion coating 4 is coated on the inner wall surface of the gas pipe shell. The high-temperature anti-corrosion coating forms a dense protective film in a high-temperature and reducing gas environment, preventing corrosive media from contacting the pipe shell; the stabilizing layer, the insulating refractory fiber paper, the insulating castable 3, and the high-temperature anti-corrosion coating are arranged from the inside to the outside on the inner wall surface of the gas pipe shell.
[0013] The aforementioned thermal insulation castable is fixed by anchors welded to the inner wall of the gas pipeline shell.
[0014] The heat-insulating and fire-resistant fiber paper is wrapped in plastic film at the factory to prevent the fiber paper from getting damp and damaged during the pouring construction, thus reducing the heat insulation effect.
[0015] The joints between the pipe bricks are filled with 2mm of refractory mortar to prevent longitudinal displacement from damaging the pipe during the thermal expansion and contraction of the high-temperature shell, thus ensuring the integrity of the lining structure.
Claims
1. A refractory lining structure suitable for high-temperature gas pipelines in hydrogen-based vertical shaft furnaces, wherein the refractory lining structure is disposed on the inner wall surface of the gas pipeline shell; characterized in that; The refractory lining structure has a stabilizing layer to enhance structural stability and sealing, which is composed of multiple interlocking pipe bricks. A layer of heat-insulating refractory fiber paper is wrapped around the outside of the stabilizing layer, forming a first insulation layer. An insulating castable forming a second insulation layer is disposed on the outside of the first insulation layer. A high-temperature anti-corrosion coating effectively resists the corrosion of reducing gases is applied to the outside of the second insulation layer, and this high-temperature anti-corrosion coating is applied to the inner wall of the gas pipe shell. The stabilizing layer, heat-insulating refractory fiber paper, insulating castable, and high-temperature anti-corrosion coating are arranged from the inside out on the inner wall of the gas pipe shell.
2. The refractory lining structure for high-temperature gas pipelines in hydrogen-based vertical furnaces as described in claim 1, characterized in that; The aforementioned thermal insulation castable is fixed by anchors welded to the inner wall of the gas pipeline shell.
3. The refractory lining structure for high-temperature gas pipelines in hydrogen-based vertical furnaces as described in claim 1, characterized in that; The joints between the pipe bricks are filled with 2mm of refractory mortar.