Burning-resistant pipe end flame arrester with low-temperature catalytic VOCs (Volatile Organic Compounds) removal function

Abstract

The invention relates to a burning-resistant pipe end flame arrester with a low-temperature catalytic VOCs (volatile organic compounds) removal function, which relates to the field of pipe end flame arresters and comprises a main valve body, a flame arrester auxiliary valve body and a honeycomb ceramic flame arresting disc arranged between the main valve body and the flame arrester auxiliary valve body. The fire-retardant disc assembly comprises a honeycomb ceramic fire-retardant disc with a catalysis function and a fire-retardant disc fixing support used for installing the honeycomb ceramic fire-retardant disc. The ceramic material and the high-density straight-hole mesh structure are adopted, so that the thermal shock resistance and high-temperature strength of the metal fire-retardant disc are remarkably improved, and the metal fire-retardant disc can bear long-time combustion, the highest use temperature as high as 1700 DEG C and the short-time high-temperature impact of 700 DEG C.

Description

Technical Field

[0001] This invention relates to the field of pipe-end flame arresters, and in particular to a burn-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function. Background Technology

[0002] A pipe-end flame arrester is a device used to prevent external flames from entering equipment or pipelines containing flammable gases, or to stop the spread of flames between equipment and pipelines. It mainly consists of two parts: a shell and a flame arresting plate, with the flame arresting plate being the primary component responsible for preventing flame propagation. Taking a common corrugated flame arrester as an example, its flame arresting plate is made by rolling thin stainless steel corrugated strips and flat strips together into a disc shape. Its flame-arresting capacity depends on the size of the triangular cross-sectional holes formed by the corrugations on the flame arresting plate and the thickness of the flame arresting plate.

[0003] When the flame passes through the flame arrestor plate, it is divided into several smaller flames by these triangular cross-section holes. This increases the contact area between the flame and the channel wall, enhances heat transfer, and lowers the flame temperature below the ignition point, thus preventing flame spread. Furthermore, due to the wall effect, when the combustible gas passes through the narrow channel of the flame arrestor element, the probability of free radicals colliding with the channel wall increases, reducing the number of free radicals participating in the reaction. When the flame arrestor channel narrows to a certain extent, collisions between free radicals and the channel wall become dominant. Because the number of free radicals decreases sharply, the propagation of the flame to unburned gas is suppressed.

[0004] A flame arrester is a flame arrester that prevents flame propagation during and after the burning process. Its burning performance is tested according to the methods specified in ISO 16852. A flame arrester should be able to withstand 120 minutes of burning without any backfire. It is mainly used in oil storage tanks, tanks or pipelines transporting or discharging flammable gases, such as flares, heating and combustion systems, petroleum gas recovery systems, or other flammable gas systems.

[0005] The flame-arresting layer inside these flame arresters is typically corrugated, formed by pressing stainless steel strips or copper-nickel alloy materials. The size of the corrugations is determined by the gas properties and the flame-arresting velocity. A common structure is shown in the attached diagram. Figure 1 As shown.

[0006] Corrugated plates and flat plates with different corrugations are wound together to form fire-resistant layers with different specifications of pores. The fire-resistant layers are formed by triangular pores of the same size. The height of the corrugations is designed according to the flame speed to be blocked. Therefore, the manufacturing process is relatively simple. It can prevent deflagration and detonation flames from passing through and is widely used.

[0007] Existing technologies have the following shortcomings (taking corrugated flame arresters as an example): 1) The pipes or pipe-end flame arresters of the metal flame arrestor plate are not resistant to prolonged combustion.

[0008] The heat generated by combustion within the pipeline will scorch the flame arrestor element and the metal components such as the housing. Test data shows that within a very short time after combustion begins, the surface temperature of the flame arrestor plate at the unprotected end reaches several hundred degrees Celsius. The scorching heat will rapidly transfer from the unprotected end to the protected end, causing the flame arrestor element at the protected end to reach a high temperature. The scorching metal surface becomes the ignition source, and the high-temperature metal flame arrestor element will ignite the medium at the protected end, turning the flame arrestor into an ignition source. Therefore, combustion occurring on a pipeline flame arrestor is extremely dangerous. Pipeline flame arrestors should have a burn resistance of at least 120 minutes. Currently, metal flame arrestor plates are not resistant to prolonged combustion. Therefore, it is necessary to add temperature monitoring instruments. When the temperature exceeds the normal operating temperature +60K, or exceeds the maximum permissible operating temperature +20K, interlocking emergency measures (cutting off the gas supply, diluting the medium, inert gas purging, etc.) should be activated to extinguish the fire and protect the flame arrestor.

[0009] 2) Existing metal corrugated flame arresters are difficult to manufacture and have a low yield rate.

[0010] The corrugated metal flame arrestor is composed of smooth steel strips and corrugated steel strips bonded together. The production process requires specialized winding equipment; generally, the corrugated steel strips are produced first, and then wound together with the smooth steel strips, resulting in relatively low production efficiency.

[0011] The wall effect is the main mechanism by which corrugated plate flame arresters prevent flame propagation. However, due to the straight-channel structure of corrugated plate flame arresters, they can only adapt to flammable gases with different maximum test safety gaps (mesg) by adjusting the size of the pores. Therefore, they have particularly high requirements for the uniformity of the pores and the mechanical properties of the material, which also increases the difficulty of processing and results in a low yield.

[0012] 3) Metal corrugated flame arresters have poor long-term pressure resistance.

[0013] Corrugated flame arrestor cores are mainly made of ultra-thin steel strips. Without stress relief, the material deforms significantly, making it difficult to guarantee the uniformity of porosity and material properties. In long-term pressurized environments, especially those with corrosive media, traditional corrugated flame arrestor cores commonly suffer from blockages or corrosion perforations. This leads to increased system pressure drop, reduced flame arresting efficiency, and increased safety hazards, causing serious consequences for the production process.

[0014] 4) Waste gas generated during chemical production processes contains a large amount of flammable and explosive components. Flame arresters are often designed into VOCs waste gas collection and treatment systems. However, when flame arresters are used to extinguish flames, they cannot perform environmentally friendly treatment of the waste gas, thus posing a potential VOCs pollution hazard.

[0015] 5) Large-diameter flame arrestor plates: Metal flame arrestor plates are heavy and difficult to disassemble, replace, or clean online. Summary of the Invention

[0016] This invention proposes a burn-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function to solve the following field problems: (1) To achieve long-term fire resistance of flame arresters, reduce additional interlocking emergency measures, and improve on-site safety; (2) After the combustion of toxic and harmful gases in the pipeline or at the pipe end, direct discharge or secondary treatment is required, which will cause pollution or make environmental protection treatment more difficult and increase the cost of environmental protection treatment. (3) Design a non-metallic fire arrestor plate to solve the problem that metal fire arrestor plates need to be selected with different anti-corrosion metal materials for different media, resulting in high cost and low efficiency. (4) It solves the problem of difficult machining of flame arrestor plates, enables rapid and mass production, and greatly improves production efficiency; (5) Enables rapid online replacement or cleaning of the flame arrestor plate; To achieve the above objectives, the present invention provides a heat-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function, comprising a main valve body and a flame arrester sub-valve body, and a honeycomb ceramic flame arrester plate disposed between the main valve body and the flame arrester sub-valve body. The flame arrester plate assembly includes the honeycomb ceramic flame arrester plate with catalytic function and a flame arrester plate fixing bracket for mounting the honeycomb ceramic flame arrester plate.

[0017] Preferably, the fire arrestor plate fixing bracket has a fire arrestor plate assembly mounting bolt on one side, which can be loosened to pull out the fire arrestor plate assembly as a whole.

[0018] Preferably, the honeycomb ceramic fire-retardant plate adopts a porous thin-walled structure.

[0019] Preferably, the honeycomb ceramic fire-retardant plate has a straight hole structure.

[0020] Preferably, the honeycomb ceramic fire-retardant plate is provided with honeycomb ceramic and foam ceramic.

[0021] Preferably, the honeycomb ceramics and foam ceramics are grown through coating, impregnation, co-precipitation, and in-situ phase-controlled growth.

[0022] Preferably, the honeycomb ceramic fire-retardant plate is made of materials including cordierite, mullite, and cordierite.

[0023] In summary, the present invention has the following beneficial technical effects: (1) The pipe or pipe end flame arrester of the metal flame arrestor plate is resistant to long-term combustion. The ceramic material and high-density straight hole mesh structure, due to the characteristics of porous thin wall, greatly increases the geometric surface area of ​​the carrier and improves the thermal shock resistance. The triangular hole is designed according to the MESG gap requirements in ISO16852. The thermal shock resistance of ceramic carriers is increasing, and the temperature of thermal shock damage is also increasing. This gives the product very high thermal shock resistance and high temperature strength. The maximum operating temperature of the honeycomb ceramic heat storage product is ≥1700℃, and it is resistant to high temperature: short-term resistance to 700°C high temperature shock; (2) The flame arrestor plate is designed as a “catalyst-loaded straight-hole honeycomb ceramic” to purify the combustion industrial waste gas, and to solve the problem of VOCs generated by the combustion of waste gas from the source, thereby improving the on-site environmental protection capabilities. (3) Change the processing and production method of metal flame arrestor plates and adopt non-metal flame arrestor plates to significantly reduce the cost of flame arrestors; (4) The quick-change flame arrestor plate assembly structure enables the flame arrestor plate to be quickly replaced or cleaned online. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a common structure mentioned in the background section; Figure 2 This is a schematic diagram of the structure of a heat-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function according to the present invention.

[0025] Reference numerals in the attached drawings: 1. Flame arrestor plate assembly; 2. Honeycomb ceramic flame arrestor plate; 3. Flame arrestor plate assembly mounting bolts; 4. Flame arrestor secondary valve body; 5. Main valve body. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] This invention discloses a heat-resistant pipe-end flame arrester with low-temperature catalytic volatile organic compound (VOCs) removal function. The flame arrester comprises the following key components: a detachable and removable flame arrestor plate assembly 1, a honeycomb ceramic flame arrestor plate 2 with low-temperature catalytic function, mounting bolts 3 for installing the flame arrestor plate assembly, a secondary valve body 4, and a main valve body 5. The flame arrestor plate is located between the main valve body 5 and the secondary valve body 4.

[0028] The flame arrestor plate assembly 1 consists of a honeycomb ceramic flame arrestor plate 2 with catalytic function and a flame arrestor plate fixing bracket. When cleaning or replacing the flame arrestor plate, simply loosen the corresponding mounting bolts to remove the entire flame arrestor plate assembly 1. After necessary processing, the assembly can be pushed back in and reused; the entire process is simple and quick.

[0029] The honeycomb ceramic flame arrestor plate 2 features a straight-pore structure, enabling catalytic activity, and is made from a variety of materials. The main materials include cordierite, mullite, and composite matrices made from cordierite. Depending on the specific mold design requirements, honeycomb ceramic products of different sizes, shapes, and structures can be custom-produced. These honeycomb ceramics, serving as catalyst carriers, exhibit excellent molding stability during manufacturing, preventing cracking and ensuring the complete release of organic components. In addition to excellent wear resistance, these honeycomb ceramics also possess a certain degree of mechanical strength, enabling them to withstand multiple regenerations and reuses, thereby extending product lifespan and improving economic efficiency.

[0030] The design, which combines ceramic materials with a high-density straight-hole mesh structure, significantly increases the geometric surface area of ​​the carrier due to its porous and thin-walled characteristics, and also significantly improves its thermal shock resistance. This design strictly adheres to the minimum effective gap (MESG) requirements of the International Organization for Standardization (ISO) 16852 standard, employing a specific layout of triangular holes to optimize heat exchange efficiency and structural stability.

[0031] The ceramic carrier exhibits a significant improvement in thermal shock resistance, with its thermal shock failure temperature threshold also increasing. This means that the carrier can maintain structural integrity and functionality when faced with rapid temperature changes, and is less prone to cracking or damage. Furthermore, the carrier maintains its mechanical strength even at high temperatures, ensuring reliability and durability under extreme operating conditions.

[0032] In summary, this ceramic material and its high-density straight-pore mesh structure not only optimize heat exchange efficiency but also significantly enhance the product's application potential in harsh environments. These characteristics enable the product to exhibit excellent thermal shock resistance and high-temperature strength in high-temperature industrial applications, making it an ideal key material choice for high-temperature environments.

[0033] The maximum operating temperature of honeycomb ceramic heat storage products can reach 1700 degrees Celsius or higher, a characteristic that gives them excellent application potential in extreme high-temperature environments. In addition to stable operation under continuous high-temperature conditions, honeycomb ceramic heat storage also possesses short-term high-temperature shock resistance, capable of withstanding instantaneous high temperatures up to 700 degrees Celsius without performance degradation. This short-term high-temperature resistance not only demonstrates the thermal stability of honeycomb ceramic materials but also showcases their reliability in the face of sudden high-temperature situations.

[0034] This invention utilizes high-quality honeycomb ceramics and foam ceramics as substrates, and through carefully designed surface modification treatments, these materials can be loaded with catalytically active components using various techniques. These techniques include coating, impregnation, co-precipitation, and in-situ phase-controlled growth to achieve effective loading of catalytically active components. The resulting flame arrestor disc can effectively achieve the medium-to-low temperature catalytic decomposition of volatile organic compounds (VOCs) during gas combustion. This flame arrestor disc is particularly suitable for treating various organic waste gases containing benzene, alkanes, alkenes, alcohols, aldehydes, ketones, phenols, ethers, acids, esters, and other compounds.

[0035] Under appropriate process conditions and operating parameters, these flame arresters can significantly improve the removal efficiency of VOCs in the system, thereby effectively reducing the emission of organic pollutants, improving air quality, and protecting the environment.

[0036] Furthermore, the straight-hole honeycomb ceramic flame arrestor plate 2 is recyclable, which not only avoids the risk of secondary pollution but also prevents the generation of solid waste. This recyclable characteristic further highlights the superiority of the straight-hole honeycomb ceramic flame arrestor plate 2 in terms of environmental protection and resource conservation. Through recycling and reuse, not only is the environmental impact reduced, but the economic efficiency and sustainability of the material are also improved, which is in line with the current development trend of green chemical processes and circular economy.

[0037] This invention relates to an innovative safety accessory for storage tanks: a heat-resistant pipe-end flame arrester with low-temperature catalytic removal of volatile organic compounds (VOCs). The core flame arrestor disc employs a "catalyst-loaded straight-hole honeycomb ceramic" structural design. This design not only endows the flame arrester with short-term resistance to 700°C high-temperature impact, ensuring its heat-resistant flame-arresting function under extreme conditions, but also achieves highly efficient VOCs catalytic decomposition performance through careful structural design and material selection.

[0038] The flame arrester's flame arrestor disc structure uses high-quality straight-pore honeycomb ceramic as the carrier material. This material undergoes professional surface modification treatment to enhance its bonding force with catalytically active components and catalytic efficiency. Subsequently, through various advanced material technologies such as coating, impregnation, co-precipitation, and in-situ crystal phase-controlled growth, low-temperature catalytically active components are loaded onto the honeycomb ceramic surface. These active components can effectively perform medium- and low-temperature catalytic decomposition of VOCs in pipeline combustion or pipe-end combustion, thereby reducing harmful gas emissions and improving the safety and environmental friendliness of the combustion process.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fire-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function, characterized in that, It includes a main valve body (5) and a flame arrester sub-valve body (4), and a honeycomb ceramic flame arrester plate (2) disposed between the main valve body (5) and the flame arrester sub-valve body (4). The flame arrester plate assembly (1) includes the honeycomb ceramic flame arrester plate (2) with catalytic function and a flame arrester plate fixing bracket for installing the honeycomb ceramic flame arrester plate (2).

2. The fire-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function according to claim 1, characterized in that, The fire arrester plate fixing bracket is provided with a fire arrester plate assembly mounting bolt (3) on one side, which can be loosened to pull out the fire arrester plate assembly (1) as a whole.

3. A fire-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function according to claim 1, characterized in that, The honeycomb ceramic fire arrestor plate (2) adopts a porous thin-walled structure.

4. A fire-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function according to claim 3, characterized in that, The honeycomb ceramic fire-retardant plate (2) has a straight hole structure.

5. A fire-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function according to claim 1, characterized in that, The honeycomb ceramic fire arrestor plate (2) is provided with honeycomb ceramic and foam ceramic.

6. A fire-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function according to claim 5, characterized in that, Cellular ceramics and foam ceramics are grown through coating, impregnation, co-precipitation, and in-situ phase regulation.

7. A fire-resistant pipe-end flame arrester with low-temperature catalytic VOCs removal function according to claim 1, characterized in that, The honeycomb ceramic fire arrestor plate (2) uses materials including cordierite, mullite and cordierite.

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