Fireproof structure of fused magnesia dust removal device
By setting up a fire resisting plate structure in the electromelting magnesium sand dust removal device, the problem of excessive flue gas temperature is solved, the effective extinguishing and temperature reduction of unburned graphite powder is achieved, and the safety and economicality of the equipment are improved.
Patent Information
- Application Number
- CN202422138732.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-02
AI Technical Summary
During the existing electromelting magnesium sand smelting process, the flue gas temperature is too high, resulting in the unburned graphite powder and high-temperature powder not being effectively extinguished, causing damage to the bag dust collector, affecting safe production and high cost.
A fire retardant plate is installed on the main pipeline of the electromelting magnesium sand dust removal device. The fire retardant plate is a rectangular steel plate, and the ventilation hole is 35 mesh. The branch pipeline is connected to the main pipeline. By reducing the flue gas wind speed and pressure, the fire retardant plate is used to intercept the unburned graphite powder and reduce the temperature.
Effectively extinguish unburned graphite powder, reduce flue gas temperature, reduce damage to bag dust collectors, extend replacement cycle, and reduce production costs.
Smart Images
Figure CN223138385U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electric fused magnesite furnace dust removal, and specifically relates to a fire prevention structure of an electric fused magnesia dust removal device. Background Art
[0002] Electric fused magnesia is usually made by high-temperature calcination of magnesite, brucite or magnesium hydroxide extracted from seawater. In the existing electric fused magnesia smelting process, a smelting temperature of over a thousand degrees is required, and a large amount of flue gas needs to be discharged. The discharged flue gas will have a very high temperature. During the high-temperature preparation process of electric fused magnesia, a dust removal device is needed to treat the dust-containing gas; when magnesite is used as the raw material, there is a decarbonization process, which includes two aspects. On the one hand, it is the thermal decomposition of magnesite ore. The main component of magnesite ore is magnesium carbonate (MgCO3): MgCO3 → MgO + CO2. On the other hand, since graphite powder additives (auxiliaries) are often added to the raw material magnesium oxide during the electric melting process, a triangular or star-shaped conducting line needs to be paved with graphite powder at the lower end of the three electrodes (graphite electrodes) during the start-up process of the electric melting furnace. During the power-on process, the graphite is burned out or completely burned to remove the graphite: C + O2 → CO2↑; due to the too high temperature in the flue gas, after passing through the pipeline and the cyclone separator, the temperature is not reduced to a suitable temperature, and a small amount of unextinguished burning graphite and high-temperature powder and ash powder fall into the bag filter together, causing damage to the filter bag, affecting safe production and causing unnecessary losses.
[0003] The existing process usually requires replacing the high-temperature resistant filter bag, but the price of the high-temperature resistant filter bag is generally expensive, and there is still a risk of burning damage when there is too much unextinguished graphite powder when the working condition deteriorates; or extending the pipeline, but this will change the positions of all equipment as a whole, and the cooling effect is not ideal.
[0004] Therefore, in order to solve the problem of too high temperature of the existing flue gas, it is necessary to improve and optimize the pipeline, reduce the flue gas temperature, and ensure safety at the same time. Content of the Utility Model
[0005] The purpose of the utility model is to provide a fire prevention structure of an electric fused magnesia dust removal device, including a main pipeline. One end of the main pipeline is connected to the smoke outlet of the electric fused magnesia furnace, and the other end is connected to the inlet of the cyclone separator. A number of branch pipelines are provided on the upper left and right sides of the main pipeline. A fire prevention plate is provided in the main pipeline and the branch pipelines. The fire prevention plate is a rectangular steel plate folded 90° along the midline of the long side. The two corners of the long side of the rectangular steel plate are fixedly connected through fire prevention plate support ribs. Fire prevention plate ventilation holes are opened on the fire prevention plate. The four corners of the fire prevention plate are fixedly connected to the main pipeline or the branch pipeline through fixing ribs. The four corners of the fire prevention plate are close to the cyclone separator side, and the midline folding angle of the fire prevention plate is close to the electric fused magnesia furnace side.
[0006] Further, the ratio of the short side length of the flame arrester to the diameter of the main pipeline is 1:2.
[0007] Further, the mesh number of the ventilation holes of the flame arrester is 35 meshes.
[0008] Further, the several branch pipelines are four branch pipelines, namely branch pipeline I, branch pipeline II, branch pipeline III and branch pipeline IV.
[0009] Further, the angles between branch pipeline I and branch pipeline IV and the horizontal plane are 45°, and the angles between branch pipeline II and branch pipeline III and the horizontal plane are 60°. Beneficial effects
[0010] The discharging device of the electric fused magnesia furnace dust collector of the present utility model has the following advantages:
[0011] 1. By adopting the upper interception feature, the unburned graphite powder is maximally extinguished with the minimum loss of the kinetic energy of the flue gas, and the temperature of the high-temperature powder is reduced, so as to reduce the temperature of the air outlet.
[0012] 2. The upper part of the branch pipeline is arranged to reduce the wind speed and pressure of the flue gas, thereby reducing the temperature inside the pipeline. Description of the drawings
[0013] Figure 1 It is the top view of the present utility model.
[0014] Figure 2 It is the right view of the present utility model. Specific embodiments
[0015] The following combines Figure 1 and Figure 2 to specifically describe the specific content of the present utility model through specific embodiments. The following is a specific embodiment:
[0016] 1. Equipment structure
[0017] A fire prevention structure for an electric fused magnesia dust removal device, including a main pipeline 1. One end of the main pipeline 1 is connected to the smoke outlet of an electric fused magnesia furnace, and the other end is connected to the inlet of a cyclone separator. On the upper left and right sides of the main pipeline, there are several branch pipelines 2. Through production practice, it is found that the temperature of the upper part of the main pipeline is higher than that of the lower part. Due to the relatively high wind speed, unburned graphite powder floats at a position closer to the upper part of the main pipeline. Reducing the wind speed and temperature of the upper part of the pipeline is the key to solving the problem of cloth bag burning loss. A fire retardant plate 3 is provided in the main pipeline 1 and the branch pipelines 2. The fire retardant plate is a rectangular steel plate folded 90° along the midline of the long side. The material of the fire retardant plate is stainless steel. The two corners of the long side of the rectangular steel plate are fixedly connected through fire retardant plate ribs 31. Fire retardant plate ventilation holes 32 are opened on the fire retardant plate. The four corners of the fire retardant plate are fixedly connected to the main pipeline or the branch pipeline through fixing ribs 4. The four corners of the fire retardant plate are close to the cyclone separator side, and the midline fold angle of the fire retardant plate is close to the electric fused magnesia furnace side.
[0018] The ratio of the short side length of the fire retardant plate 3 to the diameter of the main pipeline 1 is 1:2. The mesh number of the fire retardant plate ventilation holes 32 is 35 meshes. The particle size of most graphite powder is about 0.5 mm. Under the condition of ensuring the wind speed, try to intercept the burning graphite powder and let it fall to the bottom of the pipeline to cool down and extinguish.
[0019] The several branch pipelines 2 are four branch pipelines, namely branch pipeline I 21, branch pipeline II 22, branch pipeline III 23 and branch pipeline IV 24. The included angles between branch pipeline I 21 and branch pipeline IV 24 and the horizontal plane are 45°. The included angles between branch pipeline II 22 and branch pipeline III 23 and the horizontal plane are 60°. After improvement and testing, the inlet air temperature is 170 - 180 °C, the outlet air temperature is 100 °C, and the temperature at the bottom of the outlet is 70 - 80 °C, which is lower than the previous outlet temperature of 140 - 150 °C and the temperature at the bottom of the outlet of 120 - 130 °C. It basically meets the requirement that there is no unburned graphite powder falling at the outlet, and the replacement interval of the dust removal cloth bag is extended by 70%.
[0020] 2. Working principle
[0021] The flue gas discharged from the electric fused magnesia furnace enters the main pipeline and the branch pipelines on the upper part of the main pipeline. By reducing the pressure and wind speed in the pipeline, the temperature of the flue gas is reduced. At the same time, the unburned graphite powder and high-temperature powder in the flue gas are intercepted and fall by the fire retardant plate ventilation holes and extinguished, further reducing the temperature of the flue gas.
[0022] 3. Advantages of the embodiment
[0023] The advantages of this embodiment mainly include the following aspects:
[0024] (1) Adopting the upper interception feature, maximizing the extinguishing of unburned graphite powder with the least loss of flue gas kinetic energy, and reducing the temperature of the high-temperature powder, so as to reduce the temperature of the outlet.
[0025] (2) Installed at the upper part of the branch pipeline to reduce the wind speed and pressure of the flue gas, thereby reducing the temperature inside the pipeline.
[0026] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
Claims
1. Fire prevention structure of an electric fused magnesia dust removal device, including a main pipeline (1). One end of the main pipeline is connected to the smoke outlet of an electric fused magnesia furnace, and the other end is connected to the inlet of a cyclone separator. Its characteristic lies in that several branch pipelines (2) are arranged on the upper left and right sides of the main pipeline. A fire retardant plate (3) is arranged in the main pipeline (1) and the branch pipelines (2). The fire retardant plate is a rectangular steel plate folded 90° along the midline of the long side. Two corners of the long side of the rectangular steel plate are fixedly connected through fire retardant plate support ribs (31). Fire retardant plate ventilation holes (32) are opened on the fire retardant plate. Four corners of the fire retardant plate are fixedly connected to the main pipeline or the branch pipeline through fixing ribs (4). Four corners of the fire retardant plate are close to the cyclone separator side, and the midline fold angle of the fire retardant plate is close to the electric fused magnesia furnace side.
2. The fire prevention structure of the electrofused magnesia dust removal device according to claim 1, characterized in that, The ratio of the short side length of the fire retardant plate (3) to the diameter of the main pipeline (1) is 1:
2.
3. The fire prevention structure of the fused magnesia dust removal device according to claim 1, characterized in that, The mesh number of the fire retardant plate ventilation holes (32) is 35 meshes.
4. The fire prevention structure of the fused magnesia dust removal device according to claim 1, characterized in that, The several branch pipelines (2) are four branch pipelines, namely branch pipeline I (21), branch pipeline II (22), branch pipeline III (23) and branch pipeline IV (24).
5. The fire prevention structure of the fused magnesia dust removal device according to claim 4, characterized in that, The included angles between branch pipeline I (21) and branch pipeline IV (24) and the horizontal plane are 45°, and the included angles between branch pipeline II (22) and branch pipeline III (23) and the horizontal plane are 60°.