Dry quenching coke boiler superheater tube protection device
By installing anti-wear covers on the outside of the superheater tubes in a dry quenching coke boiler, the corrosion and erosion problems of the tubes in the high-temperature flue gas environment are solved, improving the tubes' corrosion resistance, erosion resistance, and oxidation resistance, extending their service life, and reducing the frequency of tube rupture.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUATAI YONGCHUANG (BEIJING) TECH CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-31
AI Technical Summary
In the high-temperature flue gas environment, the superheater tubes of dry quenching coke boilers are susceptible to corrosion, erosion and high-temperature oxidation, which leads to frequent tube ruptures, affecting safety and service life.
A wear-resistant cover plate is installed on the outside of the furnace tube. The wear-resistant cover plate is coaxially arranged with the furnace tube, is semi-circular, and has a gap of 0.5-1.5mm. It is made of stainless steel and coated with a nickel-chromium alloy layer on the outside. The protective layer is made of austenitic stainless steel. The connection joint is located outside the furnace to prevent coke particles from scouring and high-temperature flue gas from directly contacting it.
It effectively blocks the scouring of coke particles and high-temperature oxidation, reduces chemical corrosion, extends the service life of furnace tubes, and reduces the number of tube ruptures.
Smart Images
Figure CN224580253U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of furnace tube protection technology, and in particular to a furnace tube protection device for a dry quenching coke boiler superheater. Background Technology
[0002] Dry quenching technology is an advanced coke processing technology. Compared to traditional wet quenching methods, it significantly improves coke quality and recovers the sensible heat of red-hot coke. The dry quenching boiler, as one of the core pieces of equipment in this technology, is crucial to the overall system efficiency and energy recovery. A dry quenching boiler mainly consists of a preheater, evaporator, superheater, and economizer. The superheater is located inside the furnace, and saturated steam is introduced into its tubes to exchange heat with the high-temperature flue gas inside the boiler. This further heats the saturated steam generated by the evaporator, converting it into superheated steam to improve steam quality and work capacity. Because the superheater tubes are situated in the high-temperature flue gas environment, the chemical components and coke particles in the flue gas can easily damage the surface of the superheater tubes due to corrosion, erosion, or high-temperature oxidation, leading to tube rupture and posing a safety hazard.
[0003] Therefore, there is an urgent need to design a technical solution that can improve the corrosion resistance, erosion resistance, and high-temperature oxidation resistance of superheater tubes in dry quenching coke boilers, increase the service life of superheater tubes, and reduce the number of tube ruptures during their service life. Utility Model Content
[0004] The purpose of this invention is to provide a protective device for superheater tubes in a dry quenching coke boiler, which solves the problems existing in the prior art. It can improve the corrosion resistance, erosion resistance and high-temperature oxidation resistance of superheater tubes in dry quenching coke boilers, increase the service life of superheater tubes, and reduce the number of tube ruptures during the service life.
[0005] To achieve the above objectives, this utility model provides the following solution:
[0006] This utility model provides a protective device for the superheater tubes of a dry quenching coke boiler, comprising:
[0007] A wear-resistant cover plate is installed on the outside of the furnace tube of the superheater of a dry quenching coke boiler, and there is a gap between the wear-resistant cover plate and the furnace tube; the wear-resistant cover plate is located on the side of the furnace tube closer to the flue gas.
[0008] Preferably, the wear-resistant cover plate is arranged coaxially with the furnace tube, and the radial cross-section of the wear-resistant cover plate is semi-circular.
[0009] Preferably, the gap between the wear-resistant cover plate and the outer wall of the furnace tube is 0.5-1.5 mm.
[0010] Preferably, the thickness of the wear-resistant cover plate is 2-6mm.
[0011] Preferably, the superheater of the dry quenching coke boiler is made of austenitic stainless steel.
[0012] Preferably, the wear-resistant cover is made of stainless steel.
[0013] Preferably, the connection joint between the furnace tubes of the dry quenching coke boiler superheater and the header of the dry quenching coke boiler superheater is located outside the dry quenching coke boiler.
[0014] Preferably, the outer side of the furnace tube is coated with a protective layer.
[0015] Preferably, the protective layer is a nickel-chromium alloy layer.
[0016] Preferably, the superheater of the dry quenching coke boiler is made of aluminized alloy steel.
[0017] The present invention achieves the following technical advantages over the prior art:
[0018] This invention provides an anti-wear cover plate on the outside of the furnace tubes of the superheater in a dry quenching coke boiler. The anti-wear cover plate can prevent coke powder particles in the flue gas from directly contacting the outer wall of the furnace tubes, reducing the erosion of the outer wall of the furnace tubes by the coke powder particles. In addition, the anti-wear cover plate can also play a certain role in blocking and buffering high-temperature flue gas, preventing high-temperature flue gas from directly contacting the outer wall of the furnace tubes, reducing the problems of high-temperature oxidation and chemical corrosion of the furnace tubes, thereby improving the service life of the furnace tubes and reducing the number of tube ruptures during their service life. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the superheater tube arrangement of a dry quenching coke boiler in one or more embodiments of the present invention.
[0021] Figure 2 for Figure 1 A schematic diagram of the radial section at point A.
[0022] In the diagram: 1-Dry quenching coke boiler, 2-Flue gas inlet, 3-High temperature superheater, 4-Low temperature superheater, 5-Furnace tube, 6-Wear-resistant cover plate. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] The purpose of this invention is to provide a protective device for superheater tubes in a dry quenching coke boiler, which solves the problems existing in the prior art. It can improve the corrosion resistance, erosion resistance and high-temperature oxidation resistance of superheater tubes in dry quenching coke boilers, increase the service life of superheater tubes, and reduce the number of tube ruptures during the service life.
[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] In existing dry quenching coke boilers, the superheater tubes are directly exposed to the high-temperature flue gas environment inside the furnace. Because the superheater tubes are located in this environment, the chemical components and coke particles in the flue gas can easily cause damage to the surface of the superheater tubes due to corrosion, erosion, or high-temperature oxidation, leading to tube rupture and posing a safety hazard. To address this problem, this invention provides a protective device for the superheater tubes of a dry quenching coke boiler. (Reference) Figure 1 and Figure 2 As shown, it includes an anti-wear cover plate 6, which is disposed on the outside of the superheater tubes of the dry quenching coke boiler 1, and there is a gap between the anti-wear cover plate 6 and the tubes 5; the anti-wear cover plate 6 is located on the side of the tubes 5 closest to the flue gas. (Combined with...) Figure 1The dry quenching coke boiler 1 has a flue gas inlet 2 at one end of its upper part for introducing high-temperature flue gas. A high-temperature superheater 3 and a low-temperature superheater 4 are arranged sequentially from top to bottom inside the boiler. The upper sidewall of the furnace tube 5 of the high-temperature superheater 3 is directly exposed to the high-temperature flue gas environment, making it susceptible to scouring, chemical corrosion, and high-temperature oxidation by coke powder particles in the flue gas, potentially leading to tube rupture. This invention provides an anti-wear cover 6 on the upper outer side of the furnace tube 5 of the dry quenching coke boiler superheater. The anti-wear cover 6 can prevent direct contact between coke powder particles in the flue gas and the outer wall of the furnace tube 5, reducing the scouring effect of coke powder particles on the outer wall of the furnace tube. Furthermore, the anti-wear cover 6 can also provide a certain degree of barrier and buffering effect on the high-temperature flue gas, preventing direct contact between the high-temperature flue gas and the outer wall of the furnace tube 5, reducing the high-temperature oxidation and chemical corrosion of the furnace tube 5, thereby improving the service life of the furnace tube and reducing the number of tube ruptures during its service life. Since the radial section of the anti-wear cover plate 6 is semi-circular, it only serves to shield the side of the furnace tube 5 that is close to the high-temperature flue gas, preventing the side wall of the furnace tube from being directly eroded by the high-temperature flue gas. However, it will not completely shield the furnace tube 5 from the anti-wear cover plate 6, so it will not affect the heat exchange function between the saturated steam in the furnace tube and the high-temperature flue gas in the boiler.
[0027] In one embodiment, the wear-resistant cover plate 6 is coaxially arranged with the furnace tube 5, located on the upper part of the furnace tube 5. The length of the wear-resistant cover plate 6 is equal to the length of the furnace tube 5, and the radial cross-section of the wear-resistant cover plate 6 is semi-circular. The gap between the wear-resistant cover plate 6 and the outer wall of the furnace tube 5 is 0.5-1.5mm. This gap is used for thermal expansion to compensate for the difference in the coefficients of thermal expansion between the two. If the gap between the wear-resistant cover plate 6 and the furnace tube 5 is too small, it will affect thermal expansion and the performance of the wear-resistant cover plate 6. If the gap is too large, it will also lead to excessively high temperature on the contact side. If the thickness of the wear-resistant cover plate 6 is too small, it will lead to a short service life. If the thickness of the wear-resistant cover plate 6 is too large, it will lead to excessively high temperature on the outer side of the wear-resistant cover plate 6 in contact with the flue gas, resulting in accelerated wear. Therefore, the thickness of the wear-resistant cover plate 6 in this embodiment is 2-6mm.
[0028] In one embodiment, the superheater material of the dry quenching coke boiler is the existing austenitic stainless steel TP321H or TP347H. These stainless steel materials exhibit high allowable stress, high temperature resistance, and good oxidation resistance in high-temperature flue gas. For example, at a steam pipe outer wall temperature of approximately 600°C and 540°C, the allowable stress remains as high as 58.7 MPa, while the wall temperature of alloy steel material 12Cr1MoVG cannot exceed 580°C. This improves the ability of the superheater tubes of the dry quenching coke boiler to adapt to complex operating conditions such as wear, high-temperature sulfur corrosion, and overheating, thus extending the boiler's service life.
[0029] The wear-resistant cover plate 6 is made of stainless steel. In one embodiment, the material of the wear-resistant cover plate 6 can be 310S (0Cr25Ni20) or 309S (0Cr23Ni13). Since the superheater tubes inside the dry quenching coke boiler 1 are made of austenitic stainless steel, while the superheater header outside the furnace is still made of alloy steel such as 12Cr1MoVG or 15CrMoG, the weld joint between the superheater tubes 5 and the header involves "dissimilar steel welding." To quickly identify dissimilar steel welding joint problems, all these joints are left outside the furnace of the dry quenching coke boiler 1; that is, the connection joint between the superheater tubes 5 and the superheater header of the dry quenching coke boiler is located outside the dry quenching coke boiler 1. This allows for rapid detection of dissimilar steel welding problems in the superheater tubes, facilitating quick handling and preventing the accident from escalating and causing more serious economic losses.
[0030] In one embodiment, a protective layer formed by spraying a nickel-chromium alloy layer onto the outside of the furnace tube 5 is provided to improve its wear resistance.
[0031] In another embodiment, the material of the superheater furnace tubes is increased to stainless steel, or alloy steel is aluminized to make a dry quenching coke boiler superheater, thereby improving its wear resistance and corrosion resistance.
[0032] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A protection device for a superheater tube of a dry quenching boiler, characterized in that: include: A wear-resistant cover plate is installed on the outside of the furnace tube of the superheater of a dry quenching coke boiler, and there is a gap between the wear-resistant cover plate and the furnace tube; the wear-resistant cover plate is located on the side of the furnace tube closer to the flue gas.
2. The dry quenching boiler superheater tube shield according to claim 1, characterized in that: The wear-resistant cover plate is arranged coaxially with the furnace tube, and the radial cross-section of the wear-resistant cover plate is semi-circular.
3. The dry quenching boiler superheater tube shield of claim 1, wherein: The gap between the wear-resistant cover plate and the outer wall of the furnace tube is 0.5-1.5mm.
4. The dry quenching boiler superheater tube shield of claim 1, wherein: The thickness of the wear-resistant cover plate is 2-6mm.
5. The dry quenching boiler superheater tube shield of claim 1, wherein: The superheater of the dry quenching coke boiler is made of austenitic stainless steel.
6. The dry quenching boiler superheater tube shield of claim 1, wherein: The wear-resistant cover is made of stainless steel.
7. The dry quenching boiler superheater tube shield of claim 1 wherein: The connection joint between the furnace tubes of the dry quenching coke boiler superheater and the header of the dry quenching coke boiler superheater is located outside the dry quenching coke boiler.
8. The dry quenching boiler superheater tube shield of claim 1, wherein: The furnace tube is coated with a protective layer on the outside.
9. The dry quenching boiler superheater tube shield of claim 8, wherein: The protective layer is a nickel-chromium alloy layer.
10. The dry quenching boiler superheater tube shield of claim 1, wherein: The superheater of the dry quenching coke boiler is made of aluminized alloy steel.