Novel high-temperature flue gas flue pipe
Through the multi-section steel pipe connection structure and the design of high-temperature castable, the problem of smaller diameters and cracks caused by expansion and contraction of high-temperature flue pipes is solved, extending service life and reducing maintenance and downtime costs.
Patent Information
- Application Number
- CN202422229639.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-11
AI Technical Summary
The existing high-temperature flue pipes have smaller diameters and cracks due to thermal expansion and contraction, which affects sealing and drying efficiency, and frequent replacements lead to high maintenance and downtime costs.
It adopts a multi-section steel pipe connection structure, and each section of the steel pipe is equipped with a smoke pipe body, a steel pipe body, a fixed bracket and a welded flange. The high-temperature casting material fills the gap, the fixed bracket provides support, and the welded flange connection. The thickness of the high-temperature casting material reaches 80mm to keep the heat insulated and prevents flue gas from conducting.
It improves the service life of flue pipes, reduces maintenance and downtime costs, simplifies the installation and maintenance process, and reduces material costs.
Smart Images
Figure CN223064384U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a novel high-temperature flue gas duct pipe. Background Art
[0002] During the production process of carbon molecular sieve, materials are carbonized and roasted at high temperature in a carbonization furnace, and combustible gases such as volatile organic compounds are burned in an incinerator. The flue gas temperature in the incinerator can reach 1000 - 1200 °C. The high-temperature flue gas is induced by an end fan and enters the furnace chamber (between the furnace lining and the furnace shell) of a drying furnace through a flue duct pipe. The high-temperature flue gas heats the powdery materials (phenolic foam, the raw material of carbon molecular sieve) in the drying furnace lining to remove moisture (as Figure 1 shown). Due to the too high temperature of the high-temperature flue gas and the total length of the flue duct pipe being about 50 meters, the stainless steel pipe of 310S material used for the flue pipe is wrapped with refractory fiber cotton on the outer layer of the pipe. Since the temperature of the flue gas pipe is 1000 - 1200 °C, the stainless steel pipe expands and deforms due to heat. The carbonization furnace and the pipe need to be shut down for maintenance every month. The pipe cools down from high temperature to normal temperature and then rises from normal temperature to high temperature every month. The stainless steel flue duct pipe experiences expansion and contraction every month and is severely damaged. Some parts of the whole pipe are squeezed and deformed, the diameter of the flue duct pipe becomes smaller, and some have cracks, resulting in insufficient sealing of the whole system, insufficient air induction by the fan, reduced drying efficiency, affecting the production capacity of the drying process, and the whole flue duct pipe needs to be replaced every 6 - 8 months. Each replacement takes 5 - 7 days, and the shutdown cost, pipe material cost, and construction cost are too high. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is: to provide a novel high-temperature flue gas duct pipe, aiming to solve the defects of expansion and contraction caused by the pipe heating and cooling, resulting in a smaller diameter and cracks, improve the service life of the pipe, and reduce the maintenance cost and the shutdown cost caused by replacing the pipe.
[0004] To solve the above technical problem, the technical solution of the utility model is: a novel high-temperature flue gas duct pipe, which is composed of multiple sections of steel pipes connected to each other. Each section of the steel pipe is provided with a flue pipe body, high-temperature casting material, steel pipe body, fixed support, and welding flange; the flue pipe body is located inside the steel pipe body and is used for transporting high-temperature gas; the steel pipe body is located outside the flue pipe body and is coaxial and concentric with the flue pipe body; the high-temperature casting material is located between the steel pipe body and the flue pipe body and fills the gap between the steel pipe body and the flue pipe body; the fixed support is located between the steel pipe body and the flue pipe body and supports the gap between the flue pipe body and the steel pipe body; the welding flange is located at both ends of the flue pipe body and the steel pipe body and is fixedly connected to the end faces of the flue pipe body and the steel pipe body for connecting two adjacent steel pipes.
[0005] Further, the length of each section of the steel pipe is 1.5 - 2 meters, facilitating the filling of the high-temperature casting material between the smoke pipe body and the steel pipe body.
[0006] Further, the high-temperature casting material is a mixture of anti-corrosion casting material and liquid phosphoric acid.
[0007] Further, the high-temperature casting material is flush with the welded flange inside the steel pipe.
[0008] Further, the thickness of the high-temperature casting material inside the steel pipe is 80 - 100 mm.
[0009] Further, a plurality of fixing brackets are provided, symmetrically distributed in a ring inside the steel pipe and distributed along the axial direction of the steel pipe.
[0010] Further, each of the fixing brackets is formed by arranging two steel bars in a "V" shape, with the opening fixedly connected to the outer wall of the smoke pipe body, and the tip of the "V" fixedly connected to the inner wall of the steel pipe body.
[0011] Further, the steel pipe body and the smoke pipe body are made of Q235B spiral seam steel pipe or straight seam steel pipe or 304 stainless steel pipe.
[0012] Compared with the prior art, a new type of high-temperature flue gas duct provided by the present utility model has the following advantages: since the length of each section of the steel pipe is 1.5 - 2 meters and welded flanges are provided at both ends, it is convenient for installation and maintenance. When filling the high-temperature casting material, it is flush with the flange, preventing high-temperature flue gas from conducting to the flange. The thickness of the high-temperature casting material reaches at least 80 mm, which can play a heat preservation role. After the 1200°C flue gas passes through the 80-mm-thick high-temperature casting material and conducts to the steel pipe, it is ≤260°C. Before filling the high-temperature casting material, "V"-shaped fixing brackets are welded on the inner wall of the steel pipe to provide support and strengthening for the high-temperature casting. Using the inner lining of high-temperature casting material in the steel pipe can effectively reduce the steel material, and ordinary steel can meet the requirements, reducing the cost of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 Shows a schematic diagram of the application scenario of the present utility model.
[0014] Figure 2 Shows a main sectional view of each section of the steel pipe of the present utility model.
[0015] Figure 3 Shows a left sectional view of each section of the steel pipe of the present utility model.
[0016] Wherein: 1. Smoke pipe body, 2. High-temperature casting material, 3. Steel pipe body, 4. Fixing bracket, 5. Welded flange. DETAILED DESCRIPTION OF THE INVENTION
[0017] In one embodiment, as Figure 2 shown, a new type of high-temperature flue gas duct is composed of multiple sections of steel pipes connected to each other. Each section of the steel pipe is provided with a flue pipe body 1, a high-temperature castable 2, a steel pipe body 3, a fixed support 4, and a welding flange 5; the flue pipe body 1 is located inside the steel pipe body 3 and is used for transporting high-temperature gas; the steel pipe body 3 is located on the periphery of the flue pipe body 1 and is coaxial and concentric with the flue pipe body 1; the high-temperature castable 2 is located between the steel pipe body 3 and the flue pipe body 1 and fills the gap between the steel pipe body 3 and the flue pipe body 1; the fixed support 4 is located between the steel pipe body 3 and the flue pipe body 1 and supports the gap between the flue pipe body 1 and the steel pipe body 3; the welding flange 5 is located at both ends of the flue pipe body 1 and the steel pipe body 3 and is fixedly connected to the end faces of the flue pipe body 1 and the steel pipe body 3 and is used for connecting two adjacent steel pipes.
[0018] Further, the length of each section of the steel pipe is 1.5 - 2 meters, which is convenient for filling the high-temperature castable 2 between the flue pipe body 1 and the steel pipe body 3.
[0019] Further, the high-temperature castable 2 adopts a mixture of anti-corrosion castable and liquid phosphoric acid.
[0020] Further, the high-temperature castable 2 is flush with the welding flange 5 inside the steel pipe.
[0021] Further, the thickness of the high-temperature castable 2 inside the steel pipe is 80 - 100 mm.
[0022] Further, a plurality of the fixed supports 4 are provided and are annularly and symmetrically distributed inside the steel pipe and are distributed along the axial direction of the steel pipe.
[0023] Further, each of the fixed supports 4 is formed by arranging two steel bars in a "V" - shaped structure. The opening is fixedly connected to the outer wall of the flue pipe body 1, and the tip of the "V" is fixedly connected to the inner wall of the steel pipe body 3.
[0024] Further, the steel pipe body 3 and the flue pipe body 1 adopt Q235B spiral - welded steel pipes or straight - welded steel pipes or 304 stainless steel pipes.
[0025] The present utility model is not limited to the above - mentioned specific embodiments. Those of ordinary skill in the art, starting from the above - mentioned concept, without creative labor, the various transformations made all fall within the protection scope of the present utility model.
Claims
1. A new type of high-temperature flue gas duct, which is composed of multiple sections of steel pipes connected to each other, is characterized in that Each section of the steel pipe is provided with a flue pipe body, high-temperature casting material, steel pipe body, fixed support and welding flange; the flue pipe body is located inside the steel pipe body and is used for conveying high-temperature gas; the steel pipe body is located on the periphery of the flue pipe body and is coaxial and concentric with the flue pipe body; the high-temperature casting material is located between the steel pipe body and the flue pipe body and fills the gap between the steel pipe body and the flue pipe body; the fixed support is located between the steel pipe body and the flue pipe body and supports the gap between the flue pipe body and the steel pipe body; the welding flange is located at both ends of the flue pipe body and the steel pipe body and is fixedly connected to the end faces of the flue pipe body and the steel pipe body and is used for connecting two adjacent steel pipes.
2. A novel high-temperature flue gas duct according to claim 1, characterized in that, The length of each section of the steel pipe is 1.5 - 2 meters, which is convenient for filling the high-temperature casting material between the flue pipe body and the steel pipe body.
3. A novel high-temperature flue gas duct according to claim 1, characterized in that, The high-temperature casting material adopts a mixture of anti-corrosion casting material and liquid phosphoric acid.
4. A novel high-temperature flue gas duct according to claim 1, characterized in that, The high-temperature casting material is flush with the welding flange inside the steel pipe.
5. A novel high-temperature flue gas duct according to claim 4, characterized in that, The thickness of the high-temperature casting material inside the steel pipe is 80 - 100 mm.
6. A novel high-temperature flue gas duct according to claim 1, characterized in that A plurality of fixed supports are provided and are annularly and symmetrically distributed inside the steel pipe and are distributed along the axial direction of the steel pipe.
7. A novel high-temperature flue gas duct according to claim 6, characterized in that, Each fixed support is formed by arranging two steel bars in a "V" - shaped structure, the opening is fixedly connected to the outer wall of the flue pipe body, and the tip of the "V" is fixedly connected to the inner wall of the steel pipe body.
8. A novel high-temperature flue gas duct according to claim 1, characterized in that, The steel pipe body and the flue pipe body adopt Q235B spiral - welded steel pipe or straight - welded steel pipe or 304 stainless steel pipe.