Exhaust structure with long service life and self-cleaning function

Abstract

The utility model relates to the field of kiln exhaust systems, in particular to an exhaust structure with a long service life and a self-cleaning function, which comprises an exhaust branch pipe, an exhaust main pipe communicated with the exhaust branch pipe and an exhaust chimney communicated with the exhaust main pipe. The main exhaust pipe is of a multi-section type, and the multiple sections of the main exhaust pipe are connected through expansion joints. Burners are arranged at the two ends of the main exhaust pipe and can spray flames of combustible gas into the main exhaust pipe. The multi-section type exhaust main pipe design is adopted, the thermal stress problem caused by temperature changes can be effectively solved, and therefore the service life of the exhaust system is prolonged. And burner devices are arranged at the two ends of the main exhaust pipe. The burners can spray flames of combustible gas into the main exhaust pipe, and the scale in the main exhaust pipe is burnt out by high-temperature combustion, so that the scale on the pipe wall is automatically removed, and the self-cleaning of the exhaust structure is realized. The function not only reduces the cleaning and maintenance cost, but also ensures that the exhaust pipeline is unobstructed for a long time.

Description

Technical Field

[0001] This utility model relates to the technical field of kiln exhaust systems, and in particular to an exhaust structure with long service life and self-cleaning function. Background Technology

[0002] In industrial production and kiln operations, exhaust systems play a crucial role. Traditional exhaust mechanisms often suffer from problems such as short service life, high cleaning and maintenance costs, and low exhaust efficiency. Especially in high-temperature and highly corrosive industrial environments, exhaust pipes are susceptible to thermal stress, scale buildup, and corrosion, leading to poor exhaust, system failure, and even safety hazards.

[0003] Existing exhaust systems typically employ a design with a fixed main exhaust pipe connected to a single branch pipe. However, this design faces several technical bottlenecks during long-term operation: 1. Thermal stress concentration and structural lifespan issues: When the kiln intermittently emits high-temperature exhaust gas, the main exhaust pipe is prone to deformation stress due to differences in thermal expansion coefficients. This is especially problematic at the connection between the main pipe and the branch pipe, where weld cracking and pipe creep deformation are likely to occur, leading to a short system lifespan. 2. Carbon buildup and maintenance challenges: Unburned tar and carbon black particles in the exhaust gas easily deposit on the low-temperature section of the pipe wall, forming a coking layer with a cumulative thickness exceeding 5mm. This not only reduces exhaust efficiency but also necessitates frequent shutdowns for mechanical decoking. 3. Lack of thermal compensation capability: The integrated main exhaust pipe design does not consider displacement compensation requirements between it and the branch pipe, making it difficult to effectively absorb displacement under complex thermal cycling conditions. Therefore, designing a novel exhaust structure that combines thermal stress compensation, online self-cleaning, and long lifespan is a problem that those skilled in the art need to consider. Utility Model Content

[0004] The purpose of this invention is to provide an exhaust structure with a long lifespan and self-cleaning function to solve the problems of poor thermal compensation, short service life and difficulty in cleaning of existing kiln exhaust mechanisms.

[0005] The technical solution of this utility model is: an exhaust structure with long service life and self-cleaning function, including an exhaust branch pipe, an exhaust main pipe connected to the exhaust branch pipe, and an exhaust chimney connected to the exhaust main pipe. The exhaust main pipe is multi-sectioned, and the multiple exhaust main pipe sections are interconnected by expansion joints.

[0006] Both ends of the exhaust pipe are equipped with burners, which can introduce combustible gas flames into the exhaust pipe.

[0007] The exhaust main pipe adopts a multi-section design, with expansion joints enabling flexible connections between sections. This effectively addresses thermal stress caused by temperature changes and facilitates maintenance. Burners are installed at both ends of the exhaust main pipe. Combustible gas flames are introduced through the burners, and the high-temperature combustion principle automatically removes scale buildup from the pipe walls, achieving self-cleaning of the exhaust structure. This also allows for uninterrupted operation, ensuring the kiln's production efficiency. The exhaust main pipe wall also features a layered design, with the inner layer made of high-quality, high-temperature-resistant material. This enhances the heat resistance of the pipe wall, further extending the service life of the exhaust main pipe.

[0008] Preferably, multiple exhaust branch pipes are provided and connected to the lower end of the main exhaust pipe; the end of the exhaust branch pipe away from the main exhaust pipe is connected to the kiln.

[0009] The exhaust chimney is located at the upper end of the exhaust main pipe and connected to the middle of the exhaust main pipe.

[0010] Preferably, both the main exhaust pipe and the branch exhaust pipe are constructed from high-temperature resistant materials.

[0011] Preferably, the exhaust main pipe and the exhaust branch pipe are connected by refractory mud sealing.

[0012] Preferably, each section of the exhaust main pipe is connected to one or more exhaust branch pipes.

[0013] Preferably, an exhaust pump is connected to the exhaust chimney.

[0014] Preferably, the wall of the exhaust pipe is layered, and the inner layer is made of a high-temperature resistant material.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] (1) A multi-section exhaust main pipe design is adopted, and the sections are flexibly connected through expansion joints. This effectively addresses the thermal stress caused by temperature changes, thereby extending the service life of the exhaust system. At the same time, in the event of a failure in the exhaust main pipe, it is not necessary to completely dismantle it, making maintenance and repair more convenient.

[0017] (2) Burner devices are installed at both ends of the exhaust pipe. These burners can introduce combustible gas flames into the exhaust pipe and automatically remove the scale on the pipe wall using the principle of high-temperature combustion, thus achieving self-cleaning of the exhaust structure. This function not only reduces cleaning and maintenance costs, but also ensures that the exhaust pipe remains unobstructed for a long time;

[0018] (3) The exhaust main pipe wall also adopts a layered design, with the inner layer made of high-quality high-temperature resistant material. This design not only enhances the heat resistance of the pipe wall, but also effectively prevents high-temperature exhaust gas from damaging the pipe wall, thereby further extending the service life of the exhaust main pipe. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of the exhaust structure with long life and self-cleaning function described in this utility model;

[0021] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0022] Figure 3 for Figure 1 Enlarged structural diagram at point B.

[0023] The components include: exhaust branch pipe 1, exhaust main pipe 2, exhaust chimney 3, expansion joint 4, and burner 5. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to specific embodiments:

[0025] like Figures 1-3 As shown, this utility model is applied to the exhaust system of a kiln, mainly composed of an exhaust branch pipe 1, an exhaust main pipe 2, an exhaust chimney 3, and an exhaust pump (not shown in the figure). The exhaust branch pipe 1 is connected to the kiln (not shown in the figure). During kiln operation, the exhaust gas enters the exhaust main pipe 2 through the exhaust branch pipe 1 under the negative pressure of the exhaust pump (not shown in the figure), and is finally discharged by the exhaust pump (not shown in the figure) to the air or gas treatment system. After prolonged use of the exhaust structure, unburned tar and carbon black particles will deposit on the low-temperature section of the pipe wall, forming a coking layer. This coking layer needs to be cleaned by spraying combustible gases such as methane through the burners. Specifically:

[0026] An exhaust structure with long service life and self-cleaning function includes an exhaust branch pipe 1, an exhaust main pipe 2 connected to the exhaust branch pipe 1, and an exhaust chimney 3 connected to the exhaust main pipe 2. The exhaust main pipe 2 is multi-segmented, and the multiple segments of the exhaust main pipe 2 are interconnected by expansion joints 4. Burners 5 are provided at both ends of the exhaust main pipe 2, and combustible gas flames can be introduced into the exhaust main pipe 2 through the burners 5. Depending on the kiln setup, each kiln or each segment of a multi-segment kiln in a row is connected to the upper end of the exhaust branch pipe 1; the exhaust main pipe 2 can be horizontally arranged, and the upper end of each exhaust branch pipe 1 is connected to the exhaust main pipe 2; the exhaust chimney 3 is connected at the center of the upper end of the exhaust main pipe 2, or it can be connected at any position other than the two ends of the exhaust main pipe 2 according to the actual space design; this allows the exhaust gas from all kilns to enter the exhaust main pipe 2 through the exhaust branch pipe 1 and finally be discharged through the exhaust chimney 3, achieving centralized emission and treatment of exhaust gas.

[0027] In this embodiment, both the main exhaust pipe 2 and the branch exhaust pipe 1 are constructed using high-temperature resistant materials. Compared to traditional metal pipes, this reduces the surface temperature of the pipe's outer wall, lowering the risk of burns during maintenance and repair. Furthermore, the use of refractory mortar to seal the connection between the main exhaust pipe 2 and the branch exhaust pipe 1 ensures the sealing and high-temperature resistance of the joint. It should be noted that in metal pipe systems, high-temperature burning of the internal tar can cause a rapid temperature rise, leading to deformation and cracks at connections or welds. Dismantling the chimney for this purpose requires shutdown, disrupting production and resulting in low cleaning efficiency.

[0028] In the multi-segment configuration of the exhaust main pipe 2, each segment is connected by an expansion joint 4. The expansion joint 4 has excellent expansion and contraction performance, effectively absorbing thermal stress caused by temperature changes and preventing damage to the exhaust main pipe 2 due to thermal expansion and contraction. Furthermore, the expansion joint 4 also has a certain degree of vibration damping and noise reduction, improving the overall performance of the exhaust structure. Each segment of the exhaust main pipe 2 connects to one or more exhaust branch pipes 1. If a fault occurs in one of the exhaust branch pipes 1 or its connection to the exhaust main pipe 2, only the corresponding segment of the exhaust main pipe 2 needs to be repaired or reinstalled, without the need for complete dismantling, thus reducing maintenance costs. This improves the flexibility and adaptability of the exhaust structure.

[0029] The exhaust pipe 2 is connected to burners 5 at both ends. After prolonged operation, when tar and other impurities accumulate in the exhaust pipe 2, they can be removed by introducing and igniting combustible gases such as natural gas or liquefied petroleum gas through the burners 5. The resulting high-temperature flame ablates and cleans the impurities, achieving self-cleaning of the exhaust structure. This function not only reduces cleaning and maintenance costs but also ensures the long-term unobstructed flow of the exhaust pipe. It should be noted that the kiln does not need to be shut down for cooling; the exhaust pipe can be cleaned while the kiln is in operation. The burners at both ends simultaneously spray flames for ablation, and the resulting gas is discharged through the exhaust chimney 3.

[0030] To further improve exhaust efficiency, the height and diameter of the exhaust chimney 3 are designed according to actual needs to ensure that exhaust gases can be fully diffused and meet environmental protection requirements, or can be quickly discharged to the exhaust gas treatment facility. Simultaneously, an exhaust pump (not shown in the figure) is connected to the exhaust chimney 3 to increase the exhaust gas emission speed and efficiency by increasing negative pressure. The exhaust pump (not shown in the figure) can be turned on or off as needed to adjust the exhaust gas emission volume.

[0031] The wall of the exhaust main pipe 2 can be formed by a single piece of high-temperature resistant material, or it can be layered, with the inner layer made of a high-temperature resistant material. The high-temperature resistant material can be ceramic, refractory brick, etc., which have good thermal shock resistance and high-temperature stability, effectively preventing damage to the pipe wall from high-temperature exhaust gases. In the layered design, the outer layer can be wrapped with other materials for protection and reinforcement, thereby improving the overall strength and durability of the exhaust main pipe 2.

[0032] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. An exhaust structure having a long life and a self-cleaning function, characterized by: The exhaust branch pipes, the exhaust main pipe communicated with the exhaust branch pipes, the exhaust chimney communicated with the exhaust main pipe, the exhaust main pipe being multi-sectioned, and the multi-sectioned exhaust main pipe being connected with each other through expansion joints; The burner is arranged at both ends of the exhaust main pipe, and the burner can pass the combustible gas flame into the exhaust main pipe.

2. The exhaust structure having a long life and a self-cleaning function according to claim 1, characterized in that: A plurality of exhaust branch pipes are arranged and communicated at the lower end of the exhaust main pipe, and the end of the exhaust branch pipe away from the exhaust main pipe is communicated with the kiln. The exhaust chimney is arranged at the upper end of the exhaust main pipe and connected with the middle part of the exhaust main pipe.

3. The exhaust structure having a long life and a self-cleaning function according to claim 1, characterized in that: The exhaust main pipe and the exhaust branch pipe are formed by masonry of high-temperature-resistant materials.

4. The exhaust structure having a long life and a self-cleaning function according to claim 1, characterized in that: The exhaust main pipe and the exhaust branch pipe are sealed and connected by refractory mortar.

5. The exhaust structure having a long life and a self-cleaning function according to claim 1, characterized in that: One or more exhaust branch pipes are connected with each section of the exhaust main pipe.

6. The exhaust structure having a long life and a self-cleaning function according to claim 1, characterized in that: The exhaust chimney is connected with the exhaust pump.

7. The exhaust structure having a long life and a self-cleaning function according to claim 1, characterized in that: The pipe wall of the exhaust main pipe is arranged in layers, and the inner layer is made of high-temperature-resistant material.

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