A dust leakage and gas backflow prevention hood for a suspension roaster and a use method thereof

Abstract

The present application relates to the field of ore fluidization magnetization roasting, and particularly provides a dust leakage and gas backflow prevention hood for a suspension roasting furnace and a use method, the hood comprises a wind cover, a fixing plate and a core pipe; a gas cavity is formed in the wind cover, a plurality of wind cover air outlets are uniformly arranged on the wind cover in the circumferential direction of the wind cover body, and the gas cavity is in communication with the wind cover air outlets; the core pipe is arranged in the gas cavity of the wind cover, a core pipe gas channel coaxial with the core pipe is formed in the longitudinal direction of the core pipe, the core pipe gas channel is located in the gas cavity, one end of the core pipe gas channel is a core pipe air outlet, the core pipe air outlet is in communication with the gas cavity, the other end of the core pipe gas channel is a core pipe air inlet, and shunt pipes in communication with the core pipe gas channel are arranged on both sides of the core pipe gas channel; the shunt pipes are arranged in an inclined downward manner; the inclination directions of adjacent shunt pipes on the left and right sides are different, and the inclination directions of adjacent shunt pipes on the same side are the same; the hood for the suspension roasting furnace has good dust leakage and gas backflow prevention performance, and ensures stable, efficient and safe operation of the suspension magnetization roasting furnace.

Description

Technical Field

[0001] This invention relates to the field of fluidized magnetized roasting of ores, and more particularly to a wind cap for a suspension roasting furnace that prevents slag leakage and gas backflow, and its method of use. Background Technology

[0002] Suspension magnetization roasting technology can greatly improve the beneficiation grade and recovery rate of refractory iron ore in industrial production. The air distribution device is one of the important components of the suspension magnetization roasting furnace. The performance of the air distribution device plays an important role in the roasting and reduction reaction of mineral materials in the reaction chamber, as well as other complex physicochemical reactions such as mineral transformation, multiphase flow, and heat and mass transfer, ensuring the stable and efficient operation of the suspension magnetization roasting furnace.

[0003] As a key component of the air distribution system in a suspension magnetized roasting furnace, the air cap's function is to utilize its structure and resistance characteristics to introduce the reactant gas into the furnace at a certain velocity, generating a good fluidization effect and thus ensuring thorough mixing of the reactant gas with the material particles. The air cap is crucial for the stable operation of the suspension magnetized roasting furnace.

[0004] There are many types of air caps on the market. Taking the most common bell-shaped air cap as an example, its main structure consists of an outer cover and an inner core tube. When the suspension roasting furnace stops running, the air cap will no longer discharge exhaust gas, causing high-temperature fine mineral particles to accumulate at the bottom of the reduction chamber due to gravity. If coking occurs in the suspension roasting furnace, it is necessary to shut down the furnace urgently. At this time, the air cap will quickly stop ventilation, so a large number of high-temperature fine mineral particles that are stuck together may enter the air cap holes. In addition, during the operation of the suspension roasting furnace, the vortex formed between the core tube and the air cover inside the air cap, and at the outlet of the air cover, can also easily bring the material in the reduction chamber into the air cap. Long-term accumulation can easily lead to blockage of the air cap holes, causing a lot of trouble for subsequent troubleshooting.

[0005] Furthermore, traditional wind caps are connected to the core tube via bolts or welding. Maintenance requires entering the reduction chamber to remove each wind cap individually, a cumbersome, labor-intensive, and costly process. Additionally, the internal threaded structure and welded parts of the wind cap are prone to deformation and melting under the high-temperature environment of the levitation magnetization roasting furnace, shortening its lifespan and severely impacting the safe and stable operation of the furnace.

[0006] In the working environment of a levitation magnetized roasting furnace, abnormal increases in outlet pressure or abnormal decreases in inlet pressure frequently occur. These abnormalities can easily lead to backflow of gas or flame within the pipeline, posing a risk of combustion and explosion. Therefore, developing a device to prevent the backflow of combustible gas is an urgent need.

[0007] A new type of air cap not only solves the above problems, but also has good anti-slag leakage and anti-backflow properties, ensuring the stable, efficient and safe operation of the suspension magnetization roasting furnace. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a wind cap for a suspension roasting furnace that prevents slag leakage and gas backflow. The wind cap includes a wind hood, a fixing plate, and a core tube. An air chamber is formed within the wind hood, and multiple wind hood outlet holes are evenly arranged along the circumference of the wind hood body, with the air chamber communicating with the wind hood outlet holes. A core tube is installed within the air chamber of the wind hood, and a core tube air passage, coaxial with the core tube, is formed along the longitudinal direction of the core tube. The core tube air passage is located within the air chamber, with one end serving as the core tube air outlet communicating with the air chamber, and the other end as the core tube air inlet. Diverter pipes communicating with the core tube air passage are arranged on both sides of the core tube air passage.

[0009] The bottom of the shroud is connected to a fixing plate with bolt holes. The outer wall of the core tube has threaded blind holes that match the bolt holes along its circumferential direction. The bolts pass through the bolt holes and are screwed into the threaded blind holes to connect the fixing plate to the core tube.

[0010] The wind shield and the fixing plate are integrally formed.

[0011] The top of the air chamber is designed with an inverted V-shaped structure.

[0012] The air outlet of the hood is set at an angle downwards.

[0013] The diversion pipe is inclined downwards; the inclination directions of adjacent diversion pipes on the left and right sides are different, while the inclination directions of adjacent diversion pipes on the same side are the same.

[0014] A method for using a wind cap for a suspension roasting furnace that prevents slag leakage and gas backflow includes the following steps:

[0015] S1. Install the hood, fixing plate and core tube. Weld the hood and fixing plate into a single structure. Then, pass the bolts through the bolt holes on the fixing plate and screw them into the blind bolt holes on the outer wall of the core tube to complete the installation of the hood.

[0016] S2. The reducing gas generated by the suspension roasting furnace enters the core tube through the core tube inlet. It first enters the distribution tube through the core tube gas passage inside the core tube and moves counterclockwise upward along the distribution tube.

[0017] S3. The reducing gas generated by the suspension roasting furnace passes through the diversion pipe, enters the gas chamber through the gas outlet of the core tube, and is discharged from the air outlet of the air hood through the gas chamber.

[0018] The present invention has the following advantages over the prior art:

[0019] 1. The air outlet of the hood in this invention is set at an angle downward, which effectively solves the problem of easy clogging of the hood and prevents material from accumulating in the air chamber, thus ensuring the efficient operation of the hood.

[0020] 2. The inner side of the top of the shroud of the present invention is set as an inverted V structure, which effectively reduces the problem of slag leakage and energy loss caused by the vortex formed by the collision of reducing gas and the inner side of the top of the shroud.

[0021] 3. The wind cap and fixing plate of this invention are integral structures, which effectively solves the problems of deformation and loosening of the threads and welds of the wind cap inside the furnace due to high temperature. In addition, this structure also facilitates the fixing and installation of the wind cap.

[0022] 4. The flow-diverting structure of the core tube of this invention enables the reducing gas to flow unidirectionally from the bottom to the top, effectively solving the problems of slag leakage from the air cap and the backflow of reducing gas. Attached Figure Description

[0023] Figure 1 This is a front view of a vent cap structure for a suspension roasting furnace that prevents slag leakage and gas backflow, according to a specific embodiment of the present invention.

[0024] Figure 2 This is a top view of a vent cap for a suspension roasting furnace that prevents slag leakage and gas backflow, according to a specific embodiment of the present invention.

[0025] Figure 3 This is a diagram showing the forward gas flow direction of a vent cap core tube for a suspension roasting furnace that prevents slag leakage and gas backflow, according to a specific embodiment of the present invention.

[0026] Figure 4 This is a reverse gas flow diagram of the core tube of a suspension roasting furnace for preventing slag leakage and gas backflow in a specific embodiment of the present invention.

[0027] In the diagram: 1. Fan shroud; 2. Fan shroud air outlet; 3. Core tube; 4. Core tube air inlet; 5. Air chamber; 6. Core tube air outlet; 7. Diverter tube; 8. Threaded blind hole; 9. Bolt; 10. Fixing plate. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figures 1-2As shown, a hood for a suspension roasting furnace that prevents slag leakage and gas backflow is provided. The hood includes a hood 1, a fixing plate 10, and a core tube 3. An air chamber 5 is provided inside the hood 1. Multiple air outlet holes 2 are evenly arranged on the hood 1 along the circumference of the hood body, and the air chamber 5 is connected to the air outlet holes 2. The core tube 3 is provided inside the air chamber 5 of the hood 1. A core tube air passage coaxial with the core tube 3 is provided along the longitudinal direction of the core tube 3. The core tube air passage is located inside the air chamber 5. One end of the core tube air passage is a core tube air outlet 6, which is connected to the air chamber 5. The other end is a core tube air inlet 4. Diverter pipes 7 connected to the core tube air passage are provided on both sides of the core tube air passage.

[0030] The bottom of the shroud 1 is connected to a fixing plate 10. The fixing plate 10 is provided with bolt holes, and the outer wall of the core tube 3 is provided with bolt blind holes 8 that match the bolt holes along its circumferential direction. The bolt passes through the bolt holes and is screwed into the threaded blind holes 8 to connect the fixing plate 10 and the core tube 3.

[0031] The wind cover 1 and the fixing plate 10 are integrally formed structures.

[0032] The top of the air chamber 5 is designed with an inverted V-shaped structure.

[0033] The air outlet 2 of the hood is set at an angle downwards.

[0034] The diversion pipe 3 is inclined downward; the inclination directions of adjacent diversion pipes 3 on the left and right sides are different, while the inclination directions of adjacent diversion pipes 3 on the same side are the same.

[0035] The following is in conjunction with the appendix Figures 1-4 This invention describes one implementation process:

[0036] S1. Install the hood 1, fixing plate 10, and core tube 3. Weld the hood 1 and fixing plate 10 into a single structure. Then, pass the bolts through the bolt holes on the fixing plate 10 and screw them into the bolt blind holes 8 on the outer wall of the core tube 3 to complete the installation of the hood. The hood 1 and fixing plate 10 are a single structure. This design facilitates the fixing and installation of the hood 1 and effectively avoids the problems of deformation and loosening of the internal threads and spot welded structure of the hood 1 under the high temperature and high pressure environment of the suspension magnetization roasting furnace.

[0037] S2. When the reducing gas generated by the suspension roasting furnace enters the core tube 3 through the core tube inlet 4, it first enters the diversion pipe 7 through the core tube gas passage inside the core tube 3. In this embodiment, the cross-section of the diversion pipe 7 is an elliptical structure. The reducing gas moves counterclockwise upward along the elliptical structure. When it is output from the core tube outlet 6, the reducing gas can pass through the core tube 3 unimpeded. When the reducing gas is input from the core tube outlet 6 and output from the core tube inlet 4, the reducing gas in the diversion pipe 7 will "collide" with the reducing gas in the core tube gas passage, causing energy loss. After being "collided" by multiple diversion pipes 7, the reducing gas has difficulty passing through the core tube 3. The diversion pipes 7 are arranged on both sides of the core tube gas passage and the diversion pipes 7 are inclined downward, which can make the reducing gas flow unidirectionally from the bottom to the top, effectively solving the problem of slag leakage from the air cap 1 and the problem of reducing gas backflow.

[0038] S3. The reducing gas generated by the suspension roasting furnace enters the gas chamber 5 through the core tube outlet 6 and is discharged from the air hood outlet 2 through the air chamber 5. The air hood 1 is designed with an inverted V structure, which effectively reduces the slag leakage and energy loss caused by the vortex generated by the collision of reducing gas with the inner top of the air hood 1. It better controls the gas flow, improves the efficiency of the system, and reduces the waste of resources. At the same time, the inverted V structure can also increase the stability of the air hood 1 and improve its wind resistance. The air hood outlet 2 is set at an angle downward to prevent external dust from entering the gas chamber 5 and to ensure that the material inside the gas chamber 5 can be discharged in time to prevent blockage.

[0039] Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify or replace some or all of the technical features described in the foregoing embodiments. These modifications or substitutions will not fundamentally cause the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wind cap for a suspension roasting furnace that prevents slag leakage and gas backflow, characterized in that, include: The wind hood (1), the fixing plate (10), and the core tube (3) are provided. An air chamber (5) is provided inside the wind hood (1). Multiple air outlet holes (2) are evenly arranged on the wind hood (1) along the circumference of the wind hood body, and the air chamber (5) is connected to the air outlet holes (2). The core tube (3) is provided in the air chamber (5) of the wind hood (1). A core tube air passage coaxial with the core tube (3) is provided along the longitudinal direction of the core tube (3). The core tube air passage is located in the air chamber (5), and one end is the core tube air outlet. The outlet (6) of the core tube is connected to the air chamber (5), and the other end is the inlet (4) of the core tube. A shunt pipe (7) connected to the core tube air passage is provided on both sides of the core tube air passage. The cross section of the shunt pipe (7) is elliptical. The shunt pipe (7) is inclined downward. The inclination direction of the adjacent shunt pipes (7) on the left and right sides is different. The inclination direction of the adjacent shunt pipes (7) on the same side is the same. The inlet and outlet ends of the shunt pipe (7) are connected to the core tube (3).

2. The air cap for a suspension roasting furnace that prevents slag leakage and gas backflow according to claim 1, characterized in that: The bottom of the hood (1) is connected to a fixing plate (10). The fixing plate (10) has bolt holes, and the outer wall of the core tube (3) has a threaded blind hole (8) that matches the bolt holes along its circumferential direction. The bolt passes through the bolt hole and is screwed into the threaded blind hole (8) to connect the fixing plate (10) and the core tube (3).

3. The air cap for a suspension roasting furnace that prevents slag leakage and gas backflow according to claim 1, characterized in that: The wind shield (1) and the fixing plate (10) are integrally formed structures.

4. The air cap for a suspension roasting furnace that prevents slag leakage and gas backflow according to claim 1, characterized in that: The top of the air cavity (5) is designed with an inverted V-shaped structure.

5. The air cap for a suspension roasting furnace that prevents slag leakage and gas backflow according to claim 1, characterized in that: The air outlet (2) of the hood is set at an angle downward.

6. A method of using the air cap for a suspension roasting furnace that prevents slag leakage and gas backflow as described in any one of claims 1-5: S1. Install the wind cover (1), the fixing plate (10) and the core tube (3). Weld the wind cover (1) and the fixing plate (10) into a single structure. Then, pass the bolt through the bolt hole on the fixing plate (10) and screw it into the threaded blind hole (8) on the outer wall of the core tube (3) to complete the installation of the wind cap. S2. The reducing gas generated by the suspension roasting furnace enters the core tube (3) through the core tube inlet (4). It first enters the split tube (7) through the core tube gas passage in the core tube (3). The reducing gas moves counterclockwise upward along the split tube (7). S3. The reducing gas generated by the suspension roasting furnace passes through the diversion pipe (7), enters the gas chamber (5) through the gas outlet (6) of the core tube, and is discharged from the air outlet (2) of the air hood through the gas chamber (5).

Images