Sintering primary mixer composite dust treatment system and method thereof

Abstract

The application discloses a sintering primary mixer composite dust treatment system, which comprises a primary mixer (1), a feeding belt (2) and a discharging chute (3). The discharging chute (3) is arranged in the primary mixer (1). The feeding belt (2) extends into the feeding port of the primary mixer (1). The discharging end of the feeding belt (2) is connected with the feeding end of the discharging chute (3). The discharging chute is additionally arranged in the primary mixer and located at the discharging end of the feeding belt, so that the height difference of sintering raw materials during discharging is reduced, the generation of dust during discharging is reduced, and the dust pollution problem of the sintering primary mixer system is improved.

Description

Technical Field

[0001] This invention relates to the dust removal process of sintering mixers, specifically to a composite dust control system and method for sintering primary mixers, belonging to the technical field of sintering process equipment. Background Technology

[0002] The mixing process is one of the main processes in the sintering system. The purpose of mixing is twofold: first, to thoroughly mix the components in the batch to obtain sinter with a more uniform quality; and second, to wet and granulate the material to obtain a sintered mixture with suitable particle size and good permeability. Two-stage mixing involves sequentially mixing the batch on two separate machines. The primary task of primary mixing is to wet and homogenize the material, ensuring a uniform distribution of moisture, particle size, and components. When hot return ore is added, it also preheats the mixture. Secondary mixing, in addition to continuing the homogenization process, primarily focuses on granulation. Strengthening granulation during the mixing process allows fine particles to adhere to the core particles, forming pseudo-particles of a specific size. This improves the permeability of the sintered bed and achieves higher sintering productivity.

[0003] In the raw material preparation stage of sintering, quicklime (CaO) slaking is generally used, followed by the addition of water. This causes the calcium oxide to react chemically with the water to form calcium hydroxide, releasing a large amount of heat during the reaction. This process can enhance the sintering process, increase the material temperature, and reduce excessive moisture during sintering. The slaked lime has a colloidal surface, strong water absorption, and high binding force, which can improve the pelletizing properties of the sintered mixture. However, the use of quicklime slaking also presents a serious dust pollution problem in the primary sintering mixer. Quicklime slaking generates a large amount of water vapor, which carries a significant amount of dust with it, polluting the surrounding environment. The dust is characterized by high humidity, high concentration, low specific gravity, and fine particles. This part of the dust-laden gas is in a saturated state, and water vapor condenses into water in the pipes. The mixture of water and dust is in a colloidal state with strong adhesion, which easily clogs the dust collection pipes and causes adhesion to the dust collection equipment, affecting the normal operation of the dust collection system. In severe cases, it can paralyze the entire dust collection system in a short time, causing the dust-laden gas to overflow and the air to be filled with lime dust, which causes strong irritation to the human respiratory system. Over time, the surrounding area will be covered with white lime dust, causing serious environmental damage.

[0004] Currently, to prevent pipe blockage, the main method is to install water spray nozzles along the pipe from the dust removal point to the inlet pipe of the dust removal equipment to alleviate the blockage. However, the disadvantage of this method is that it consumes a lot of water, cannot completely avoid pipe blockage, and requires regular cleaning of the sediment at the low points or bends of the pipe.

[0005] Furthermore, the current selection of dust removal equipment mainly focuses on wet scrubbers or combinations of wet scrubbers and wet electrostatic precipitators. The highest dust removal efficiency of wet scrubbers is only 97%, which is insufficient to meet emissions standards of 20 mg / m³. 3 The requirement is that the dust collector inlet concentration must not exceed 670 mg / m³. 3 The actual dust collector inlet concentration is generally 8–15 g / m³. 3 The emissions are far higher than this value. Therefore, single-stage wet scrubbing cannot guarantee emission requirements. A two-stage wet scrubbing system or a wet scrubbing system connected in series with a wet electrostatic precipitator is needed to ensure emissions compliance. This configuration significantly increases equipment costs and floor space requirements. Existing dust removal technologies are all wet scrubbing systems, which require extensive system maintenance and regular cleaning of the dust collection pipes. Wet scrubbing systems generate a large amount of wastewater, which is typically pumped to a mixing tank. If the process water balance cannot be maintained, wastewater treatment will become a problem, and this wastewater may cause secondary pollution. The wet scrubbing systems used have low dust removal efficiency, making it difficult to meet current environmental emission requirements. Summary of the Invention

[0006] To address the adverse effects of quicklime digestion processes on the primary mixing of sintering processes in existing technologies, this invention proposes a composite dust control system and method for sintering primary mixers. In existing technologies, sintering raw materials are often directly conveyed into the primary mixer via a horizontally positioned feed belt. Due to the significant height difference between the feed belt and the bottom wall of the primary mixer, substantial dust is generated during the feeding process. Therefore, the composite dust control system for sintering primary mixers proposed in this invention includes a primary mixer, a feed belt, and a discharge chute. The discharge chute is located inside the primary mixer, with the feed belt extending into the feed inlet of the primary mixer, and the discharge end of the feed belt connected to the feed end of the discharge chute. By adding a discharge chute within the primary mixer and located at the discharge end of the feed belt, this invention reduces the height difference of the sintering raw materials during feeding, thereby reducing dust generation and improving the dust pollution problem of the sintering primary mixer system.

[0007] According to a first embodiment of the present invention, a composite dust control system for a sintering primary mixer is provided.

[0008] A composite dust control system for a sintering primary mixer is disclosed. The system includes a primary mixer, a feed belt, and a discharge chute. The discharge chute is located inside the primary mixer. The feed belt extends into the feed inlet of the primary mixer. The discharge end of the feed belt is connected to the feed end of the discharge chute.

[0009] In this invention, the discharge chute is disposed within the feed section of the primary mixer. Vertically, the discharge chute is located between the feed inlet of the primary mixer and the lowest point of the inner wall of the primary mixer.

[0010] Preferably, the discharge chute extends obliquely downward into the primary mixer, and along the material conveying direction, the downstream section of the discharge chute runs in the same direction as the rotation of the primary mixer.

[0011] The downstream section of the discharge chute mentioned here refers to the section of the discharge chute near the discharge end, that is, the last section (or discharge section) of the discharge chute along the material conveying direction.

[0012] In this invention, the downstream section of the discharge chute is arranged in a straight line, and the tangential angle between the straight line of the downstream section of the discharge chute and the circle containing the cross-section of the primary mixer is α, wherein the value of α ranges from 10 to 80°, preferably from 15 to 60°, and more preferably from 20 to 45°.

[0013] In this invention, the downstream section of the discharge chute is arc-shaped, and the arc of the downstream section of the discharge chute is in contact with the lower 1 / 4 arc of the circle containing the cross-section of the primary mixer.

[0014] In this invention, the inner wall of the primary mixer is provided with protrusions. Preferably, the protrusions are located at the feed section of the primary mixer, and the protrusions are arranged in a ring on the inner wall of the primary mixer.

[0015] Preferably, along the material conveying direction, within the primary mixer, the height of the protrusions in the upstream section is greater than or equal to the height of the protrusions in the downstream section. More preferably, the height of the protrusions at each location decreases sequentially.

[0016] Preferably, adjacent protrusions are interconnected, i.e., a recess is formed between two adjacent protrusions. Preferably, the protrusions are arc-shaped. More preferably, the recesses are also arc-shaped.

[0017] In this invention, a first water spraying device is provided inside the primary mixer. Preferably, the first water spraying device is provided with a first water spray volume detection device.

[0018] In this invention, a second water spraying device is provided above the feed belt. Preferably, the second water spraying device is located above the feed end of the feed belt. More preferably, the second water spraying device is provided with a second water spray volume detection device.

[0019] Preferably, the system also includes a dust collection hood, a dust collector, an exhaust fan, and a chimney. The dust collection hood is located at the feed inlet of the primary mixer. A dust collection duct extending from the dust collection hood connects to the chimney. The dust collector and exhaust fan are mounted on the dust collection duct, with the dust collector located upstream of the exhaust fan.

[0020] Preferably, the dust collection duct is equipped with a dust concentration detection device. Preferably, the dust collector is a baghouse dust collector.

[0021] Preferably, a first moisture detection device is installed at the feed inlet of the primary mixer.

[0022] Preferably, a second moisture detection device is installed at the discharge port of the primary mixer.

[0023] According to a second embodiment of the present invention, a method for controlling composite dust from a sintering primary mixer is provided.

[0024] A method for controlling composite dust from a sintering primary mixer, or a method for controlling composite dust from a sintering primary mixer using the system described in the first embodiment, the method comprising the following steps:

[0025] 1) The sintering raw materials are conveyed to the primary mixer via a feed belt. The sintering raw materials in the primary mixer are then discharged through a discharge chute to reduce dust generation during the discharge process.

[0026] 2) The sintering raw materials on the feeding chute roll down to the feeding section of the primary mixer. The sintering raw materials come into contact with the protrusions and depressions set in the primary mixer, further reducing the generation of dust.

[0027] 3) The first water spraying device installed in the primary mixer sprays water to treat the sintering raw materials, and the sintering raw materials are mixed evenly in the primary mixer to obtain sintering mixture.

[0028] Preferably, in step 1), before the sintering raw material enters the primary mixer, the sintering raw material is sprayed with water by a second water spraying device located above the feed belt.

[0029] In this invention, the method further includes:

[0030] 4) The dust-laden gas generated during the feeding process enters the dust removal pipeline through the dust collection hood. After being purified by the dust collector, the dust-laden gas is discharged to the chimney.

[0031] 5) During the dust removal process, the sintering raw material ash collected by the dust collector is returned to the feed belt.

[0032] In existing technologies, sintering raw materials are often directly conveyed to the primary mixer via a horizontally positioned feed belt. Due to the significant height difference between the feed belt and the bottom wall of the primary mixer, substantial dust is generated during the unloading process. Therefore, this invention proposes a composite dust control system for sintering primary mixers. This system includes a primary mixer, a feed belt, and a discharge chute. The discharge chute is located inside the primary mixer, with the feed belt extending into the feed inlet. The discharge end of the feed belt is connected to the feed end of the discharge chute. This invention reduces the height difference of the sintering raw materials during unloading by adding a discharge chute within the primary mixer and located at the discharge end of the feed belt. That is, after being conveyed to the primary mixer by the feed belt, the sintering raw materials continue to be unloaded through the discharge chute, thereby reducing dust generation during the unloading process and effectively improving the dust pollution problem of the sintering primary mixer system.

[0033] Generally, the feed belt is horizontally positioned, and its direction is difficult to adjust to specific needs. Therefore, this invention adds a discharge chute at the discharge end of the feed belt. Horizontally, the discharge chute is located within the feed section of the primary mixer. Vertically, the discharge chute is situated between the feed inlet of the primary mixer and the lowest point of the inner wall of the primary mixer. It should be noted that the specific structural orientation of the discharge chute in this invention can be designed and adjusted as needed. The discharge chute extends diagonally downwards into the primary mixer, and along the material conveying direction, the downstream section of the discharge chute follows the same direction as the rotation of the primary mixer. First, the feeding chute extends obliquely downwards into the primary mixer, which effectively reduces the height difference of the sintering raw materials during feeding, thus reducing dust generation. More importantly, the downstream section of the feeding chute in this invention runs in the same direction as the rotation of the primary mixer. This means that as the sintering raw materials are fed into the primary mixer through the feeding chute, they retain their inertia from the feeding chute and rotate with the primary mixer. This reduces the impact force of the sintering raw materials on the inner wall of the primary mixer when they are fed from the feeding chute, effectively suppressing dust generation during feeding and improving the problem of severe dust pollution in the sintering primary mixer system.

[0034] Specifically, the downstream section of the discharge chute can be arranged in a straight line. For example... Figure 3As shown, the tangential angle between the straight line containing the downstream section of the feeding chute and the circle containing the cross-section of the primary mixer is α, wherein the value of α ranges from 10 to 80°, preferably from 15 to 60°, and more preferably from 20 to 45°. When the tangential angle α is within the above range, the generation of dust during the feeding process can be effectively suppressed; when the tangential angle α deviates from the above range and is too small, the amount of dust generated will increase significantly, and the amount of dust may even double; when the tangential angle α deviates from the above range and is too large, it will hinder the feeding of sintering raw materials, and may even cause material blockage.

[0035] Alternatively, the downstream section of the discharge chute can also be arc-shaped. For example... Figure 4 As shown, the arc of the downstream section of the feeding chute is aligned with the lower quarter of the circle containing the cross-section of the primary mixer. This maximizes the reduction of the impact force of the sintering raw material on the inner wall of the primary mixer when it is fed from the feeding chute to the primary mixer. It is worth noting that the upper end of the portion of the downstream section of the feeding chute that aligns with the circle containing the cross-section of the primary mixer should not exceed the height of the center of the circle; otherwise, it will hinder the feeding chute's ability to carry and transport the sintering raw material. Similarly, the lower end should not exceed the lowest point of the circle; otherwise, it will affect the feeding of the sintering raw material.

[0036] As a preferred embodiment, the present invention also provides protrusions on the inner wall of the feeding section of the primary mixer. When the sintering raw material is fed into the primary mixer via a feeding belt or discharge chute, it rolls into the feeding section and first comes into contact with the protrusions. When the sintering raw material contacts the protrusions at the bottom of the inner wall of the primary mixer, due to the presence of the protrusions, the force on the sintering raw material is not entirely vertically upward, but rather obliquely upward. This obliquely upward force can be decomposed into a horizontal component and a vertical component, and the force causing dust generation during the feeding process is mainly the vertical component. In the prior art, the inner wall of the feeding section of the primary mixer often does not have a protrusion structure, in which case the force on the sintering raw material is entirely vertically upward. Clearly, the upward vertical force on the sintering raw material when the primary mixer has protrusions is less than the upward vertical force experienced by the primary mixer in the prior art when no protrusions are present. Therefore, adding a protruding structure to the inner wall of the feeding section of the primary mixer can effectively suppress dust generation during the feeding process, further solving the problem of severe dust pollution in the sintering primary mixer. Furthermore, the protruding structure on the inner wall of the primary mixer can also improve the mixing effect of the sintering material to a certain extent.

[0037] In this invention, considering that the primary mixer rotates during operation, the protrusions are arranged in a ring on the inner wall of the primary mixer's feed section. This ensures that the sintering raw material remains in contact with the protrusions throughout the feeding process, reducing dust generation. Furthermore, to facilitate the smooth conveying (or movement) of the sintering raw material within the primary mixer, the height of the protrusions in the upstream section is greater than or equal to the height of the protrusions in the downstream section along the material conveying direction. That is, the closer the protrusion is to the feed inlet of the primary mixer, the higher it is; the farther away from the feed inlet, the lower it is. To ensure that the sintering raw material rolls to different positions within the primary mixer during feeding and remains in contact with the protrusions to reduce dust generation, adjacent protrusions are interconnected, forming a recess between adjacent protrusions. Preferably, the protrusions are arc-shaped. Similarly, the recesses can also be arc-shaped.

[0038] In this invention, a first water spraying device is provided inside the primary mixer. This first water spraying device is mainly used to add water to wet and mix the sintering raw materials, ensuring a uniform distribution of moisture, particle size, and components in the sintering mixture. Simultaneously, by controlling the amount of water added by the first water spraying device inside the primary mixer, dust generation can be further suppressed to ensure the system's dust emission level. Preferably, this invention also includes a second water spraying device installed above the feed belt. Generally, sintering raw materials are fed onto the feed belt through a feed funnel. Dust is generated during the process of the sintering raw materials moving from the feed funnel to the feed belt, and dust is also generated during the conveying process on the feed belt. Therefore, this invention preferably adds a second water spraying device above the feed end of the feed belt to increase the moisture content of the sintering raw materials and alleviate dust pollution at the source. When the moisture content of the sintering raw material on the feed belt is increased, the dust generation can also be reduced when the sintering raw material is fed from the feed belt and the discharge chute to the primary mixer. As a result, the dust pollution situation of the entire system is greatly improved.

[0039] In this invention, the addition of a feeding chute and raised structure within the primary mixer, along with the coordinated water spraying of the first and second water spraying devices, effectively reduces dust generation in the sintering primary mixer system. To further ensure the system's dust emission level, this invention also includes a dust collection hood installed at the primary mixer's feed inlet. The dust collection hood is connected to the gas inlet of a dust collector via a dust collection pipe, and the gas outlet of the dust collector is connected in sequence to an exhaust fan and a chimney via pipes. The dust collector is not specifically limited, as long as it meets the dust removal requirements; for example, a baghouse dust collector can be used. The sintering raw material ash collected by the dust collector is returned to the feed conveyor belt for recycling.

[0040] In this invention, the first water spraying device is equipped with a first water spray volume detection device to control the water spray volume inside the primary mixer. The second water spraying device is equipped with a second water spray volume detection device to control the water spray volume on the feed belt. A first moisture detection device and a second moisture detection device are respectively installed at the feed inlet and discharge outlet of the primary mixer. A dust concentration detection device is also installed on the dust removal pipeline. That is, this invention effectively solves the dust pollution problem while ensuring a uniform mixing effect by real-time detection of the dust concentration at the gas inlet of the dust collector and the moisture content of the feed and discharge materials of the primary mixer. Based on the real-time detection results, the mixing effect and dust control of the primary mixer are evaluated, and the direction of the discharge section of the feed chute and the water spray volume of each water spraying device are adjusted accordingly.

[0041] Based on the aforementioned composite dust control system for a sintering primary mixer, this invention also proposes a method for dust control in a sintering primary mixer. This method mainly includes the following steps:

[0042] 1) A second water spraying device installed above the feed belt sprays water onto the sintering raw materials. The sintering raw materials after water spraying are conveyed to the primary mixer via the feed belt. The sintering raw materials in the primary mixer are then discharged through the discharge chute to reduce dust generation during the discharge process.

[0043] 2) The sintering raw materials on the feeding chute roll down to the feeding section of the primary mixer. The sintering raw materials come into contact with the protrusions and depressions set in the primary mixer, further reducing the generation of dust.

[0044] 3) The first water spraying device installed in the primary mixer sprays water to treat the sintering raw materials, and the sintering raw materials are mixed evenly in the primary mixer to obtain sintering mixture.

[0045] 4) The dust-laden gas generated during the feeding process enters the dust removal pipeline through the dust collection hood. After being purified by the dust collector, the dust-laden gas is discharged to the chimney.

[0046] 5) During the dust removal process, the sintering raw material ash collected by the dust collector is returned to the feed belt.

[0047] Compared with the prior art, the present invention has the following beneficial technical effects:

[0048] 1. This invention reduces the height difference of sintering raw materials during feeding by adding a discharge chute inside the primary mixer and located at the discharge end of the feed belt, thereby reducing dust generation during the feeding process and effectively improving the dust pollution problem of the sintering primary mixer system.

[0049] 2. In this invention, the downstream section of the feeding chute runs in the same direction as the rotation of the primary mixer along the material conveying direction. That is, the sintering raw material is fed into the primary mixer through the feeding chute. The sintering raw material continues to maintain its inertia on the feeding chute on the inner wall of the primary mixer and rotates with the primary mixer. This reduces the impact force of the sintering raw material on the inner wall of the primary mixer when it is fed from the feeding chute to the primary mixer, thereby effectively suppressing the generation of dust during the feeding process and further reducing the dust content.

[0050] 3. The present invention adds a protruding structure to the inner wall of the feeding section of the primary mixer to reduce the vertical upward force on the sintering raw material when it is fed to the bottom wall of the primary mixer, thereby further suppressing the generation of dust during the feeding process; in addition, the protruding structure set on the inner wall of the primary mixer can also improve the mixing effect of the sintering material to a certain extent.

[0051] 4. The present invention adds a water spray point above the feed end of the feed belt to increase the humidity of the material, alleviate dust pollution from the source, greatly reduce the dust generation when the material is fed from the feed hopper to the feed belt, and effectively suppress the generation of dust during the material conveying on the feed belt, thereby improving the dust pollution problem in the sintering primary mixing system.

[0052] 5. This invention monitors the dust concentration at the gas inlet of the dust collector in real time, and also monitors the moisture content of the feed and discharge materials of the primary mixer in real time. Based on the real-time monitoring results, the mixing effect and dust control of the primary mixer are evaluated, and the direction of the discharge section of the feed chute and the water spray volume of each water spraying device are adjusted accordingly, thereby effectively solving the dust pollution problem while ensuring the mixing effect. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of a composite dust control system for a sintering primary mixer according to the present invention;

[0054] Figure 2 This is a schematic diagram of the structure of the primary mixer of the present invention, which has protrusions inside;

[0055] Figure 3 This is a schematic diagram showing that the discharge section of the material chute in this invention is arranged in a straight line;

[0056] Figure 4 This is a schematic diagram showing that the discharge section of the material chute in this invention is arranged in an arc shape;

[0057] Figure 5 for Figure 2 Cross-sectional view of position AA in the middle;

[0058] Figure 6This is a schematic diagram showing that the height of the protrusion inside the primary mixer in this invention gradually decreases along the material conveying direction.

[0059] Figure label:

[0060] 1: Primary mixer; 101: Protrusion; 102: Recess; 2: Feed belt; 3: Discharge chute; 4: First water spray device; 401: First water spray volume detection device; 5: Second water spray device; 501: Second water spray volume detection device; 6: Dust collection hood; 7: Dust collector; 8: Exhaust fan; 9: Chimney; 10: Dust concentration detection device; 1101: First moisture detection device; 1102: Second moisture detection device; L: Dust collection pipe. Detailed Implementation

[0061] According to a first embodiment of the present invention, a composite dust control system for a sintering primary mixer is provided.

[0062] A composite dust control system for a sintering primary mixer is disclosed. The system includes a primary mixer 1, a feed belt 2, and a discharge chute 3. The discharge chute 3 is disposed inside the primary mixer 1. The feed belt 2 extends into the feed inlet of the primary mixer 1. The discharge end of the feed belt 2 is connected to the feed end of the discharge chute 3.

[0063] In this invention, the discharge chute 3 is disposed within the feed section of the primary mixer 1. In the vertical direction, the discharge chute 3 is located between the feed inlet of the primary mixer 1 and the lowest point of the inner wall of the primary mixer 1.

[0064] Preferably, the discharge chute 3 extends obliquely downward into the primary mixer 1, and along the material conveying direction, the downstream section of the discharge chute 3 runs in the same direction as the rotation of the primary mixer 1.

[0065] In this invention, the downstream section of the discharge chute 3 is arranged in a straight line, and the tangential angle between the straight line of the downstream section of the discharge chute 3 and the circle containing the cross-section of the primary mixer 1 is α, wherein: the value of α ranges from 10 to 80°, preferably from 15 to 60°, and more preferably from 20 to 45°.

[0066] In this invention, the downstream section of the discharge chute 3 is arc-shaped, and the arc of the downstream section of the discharge chute 3 is in contact with the lower 1 / 4 arc of the circle containing the cross-section of the primary mixer 1.

[0067] In this invention, a protrusion 101 is provided on the inner wall of the primary mixer 1. Preferably, the protrusion 101 is located at the feed section of the primary mixer 1, and the protrusion 101 is arranged in a ring on the inner wall of the primary mixer 1.

[0068] Preferably, along the material conveying direction, within the primary mixer 1, the height of the protrusion 101 located in the upstream section is greater than or equal to the height of the protrusion 101 located in the downstream section. Preferably, the height of the protrusion 101 at each position decreases sequentially.

[0069] Preferably, adjacent protrusions 101 are interconnected, that is, a recess 102 is formed between two adjacent protrusions 101. Preferably, the protrusions 101 are arc-shaped. More preferably, the recesses 102 are also arc-shaped.

[0070] In this invention, a first water spraying device 4 is provided inside the primary mixer 1. Preferably, the first water spraying device 4 is provided with a first water spray volume detection device 401.

[0071] In this invention, a second water spraying device 5 is provided above the feed belt 2. Preferably, the second water spraying device 5 is located above the feed end of the feed belt 2. More preferably, the second water spraying device 5 is provided with a second water spray volume detection device 501.

[0072] Preferably, the system also includes a dust collection hood 6, a dust collector 7, an exhaust fan 8, and a chimney 9. The dust collection hood 6 is located at the feed inlet of the primary mixer 1. A dust collection pipe L extending from the dust collection hood 6 is connected to the chimney 9. The dust collector 7 and the exhaust fan 8 are mounted on the dust collection pipe L, with the dust collector 7 located upstream of the exhaust fan 8.

[0073] Preferably, the dust collection duct L is equipped with a dust concentration detection device 10. Preferably, the dust collector 7 is a bag filter dust collector.

[0074] Preferably, a first moisture detection device 1101 is provided at the feed inlet of the primary mixer 1.

[0075] Preferably, a second moisture detection device 1102 is provided at the discharge port of the primary mixer 1.

[0076] Example 1

[0077] like Figure 1 As shown, a composite dust control system for a sintering primary mixer is disclosed. The system includes a primary mixer 1, a feed belt 2, and a discharge chute 3. The discharge chute 3 is disposed inside the primary mixer 1. The feed belt 2 extends into the feed inlet of the primary mixer 1. The discharge end of the feed belt 2 is connected to the feed end of the discharge chute 3.

[0078] Example 2

[0079] The same principle applies to Embodiment 1, except that the discharge chute 3 is located within the feed section of the primary mixer 1. In the vertical direction, the discharge chute 3 is located between the feed inlet of the primary mixer 1 and the lowest point of the inner wall of the primary mixer 1.

[0080] Example 3

[0081] The embodiment 2 is repeated, except that the discharge chute 3 extends obliquely downward into the primary mixer 1, and along the material conveying direction, the downstream section of the discharge chute 3 is aligned with the rotation direction of the primary mixer 1.

[0082] Example 4

[0083] like Figure 3 As shown, Embodiment 3 is repeated, except that the downstream section of the discharge chute 3 is arranged in a straight line, and the tangential angle α between the straight line containing the downstream section of the discharge chute 3 and the circle containing the cross-section of the primary mixer 1 is 45°.

[0084] Example 5

[0085] Example 3 is repeated, except that the downstream section of the discharge chute 3 is arranged in a straight line, and the tangential angle α between the straight line containing the downstream section of the discharge chute 3 and the circle containing the cross-section of the primary mixer 1 is 20°.

[0086] Example 6

[0087] like Figure 4 As shown, Embodiment 3 is repeated, except that the downstream section of the discharge chute 3 is arc-shaped, and the arc of the downstream section of the discharge chute 3 is in contact with the lower 1 / 4 arc of the circle containing the cross-section of the primary mixer 1.

[0088] Example 7

[0089] like Figure 2 and 5 As shown, Embodiment 4 is repeated, except that a protrusion 101 is provided on the inner wall of the primary mixer 1. The protrusion 101 is located at the feed section of the primary mixer 1, and the protrusion 101 is arranged in a ring on the inner wall of the primary mixer 1.

[0090] Example 8

[0091] like Figure 6 As shown, Example 7 is repeated, except that along the material conveying direction, in the primary mixer 1, the height of the protrusion 101 in the upstream section is greater than the height of the protrusion 101 in the downstream section, that is, the height of the protrusion 101 at each position decreases sequentially.

[0092] Example 9

[0093] The embodiment 8 is repeated, except that adjacent protrusions 101 are connected to each other, that is, a recess 102 is formed between two adjacent protrusions 101. The protrusions 101 are arranged in an arc shape.

[0094] Example 10

[0095] Repeat Example 9, except that the mixer 1 is equipped with a first water spray device 4.

[0096] Example 11

[0097] The same method as Embodiment 10 is used, except that a second water spraying device 5 is provided above the feed belt 2. The second water spraying device 5 is located above the feed end of the feed belt 2.

[0098] Example 12

[0099] The same as embodiment 11 is repeated, except that the first water spraying device 4 is equipped with a first water spray volume detection device 401.

[0100] Example 13

[0101] The embodiment 12 is repeated, except that the second water spraying device 5 is equipped with a second water spray volume detection device 501.

[0102] Example 14

[0103] The system repeats Embodiment 13, except that it also includes a dust collection hood 6, a dust collector 7, an exhaust fan 8, and a chimney 9. The dust collection hood 6 is located at the feed inlet of the primary mixer 1. A dust collection duct L extending from the dust collection hood 6 connects to the chimney 9. The dust collector 7 and the exhaust fan 8 are mounted on the dust collection duct L, with the dust collector 7 located upstream of the exhaust fan 8. The dust collector 7 is a baghouse dust collector.

[0104] Example 15

[0105] Repeat Example 14, except that the dust removal pipe L is equipped with a dust concentration detection device 10.

[0106] Example 16

[0107] Repeat Example 15, except that a first moisture detection device 1101 is provided at the feed inlet of the mixer 1.

[0108] Example 17

[0109] Repeat Example 16, except that a second moisture detection device 1102 is provided at the discharge port of the mixer 1.

[0110] Example 18

[0111] A method for controlling composite dust from a sintering primary mixer, using the system described in Example 17, includes the following steps:

[0112] 1) The sintering raw materials are conveyed to the primary mixer 1 via the feed belt 2. The sintering raw materials entering the primary mixer 1 are then discharged through the discharge chute 3 to reduce dust generation during the discharge process.

[0113] 2) The sintering raw material on the feeding chute 3 rolls down to the feeding section of the primary mixer 1. The sintering raw material comes into contact with the protrusions 101 and depressions 102 provided in the primary mixer 1, further reducing the generation of dust.

[0114] 3) The first water spraying device 4 installed in the primary mixer 1 sprays water to treat the sintering raw materials, and the sintering raw materials are mixed evenly in the primary mixer 1 to obtain sintering mixture.

[0115] Example 19

[0116] A method for controlling composite dust from a sintering primary mixer, using the system described in Example 17, includes the following steps:

[0117] 1) The second water spraying device 5, which is set above the feed belt 2, sprays water on the sintering raw material. The sintering raw material after water spraying is conveyed to the primary mixer 1 through the feed belt 2. The sintering raw material entering the primary mixer 1 is then discharged through the discharge chute 3 to reduce the generation of dust during the discharge process.

[0118] 2) The sintering raw material on the feeding chute 3 rolls down to the feeding section of the primary mixer 1. The sintering raw material comes into contact with the protrusions 101 and depressions 102 provided in the primary mixer 1, further reducing the generation of dust.

[0119] 3) The first water spraying device 4 installed in the primary mixer 1 sprays water to treat the sintering raw materials, and the sintering raw materials are mixed evenly in the primary mixer 1 to obtain sintering mixture.

[0120] Example 20

[0121] A method for controlling composite dust from a sintering primary mixer, using the system described in Example 17, includes the following steps:

[0122] 1) The second water spraying device 5, which is set above the feed belt 2, sprays water on the sintering raw material. The sintering raw material after water spraying is conveyed to the primary mixer 1 through the feed belt 2. The sintering raw material entering the primary mixer 1 is then discharged through the discharge chute 3 to reduce the generation of dust during the discharge process.

[0123] 2) The sintering raw material on the feeding chute 3 rolls down to the feeding section of the primary mixer 1. The sintering raw material comes into contact with the protrusions 101 and depressions 102 provided in the primary mixer 1, further reducing the generation of dust.

[0124] 3) The first water spraying device 4 installed in the primary mixer 1 sprays water to treat the sintering raw materials, and the sintering raw materials are mixed evenly in the primary mixer 1 to obtain sintering mixture.

[0125] 4) The dust-laden gas generated during the feeding process enters the dust removal pipe L through the dust suction hood 6. After being purified by the dust collector 7, the dust-laden gas is discharged to the chimney 9.

[0126] 5) During the dust removal process, the sintering raw material ash collected by the dust collector 7 is returned to the feed belt 2.

[0127] Application Example 1

[0128] The system described in Example 17 is used to control the dust generated in the sintering primary mixer system. In Example 17, the downstream section of the feeding chute 3 is arranged in a straight line, and the tangent-chord angle α between the straight line containing the downstream section of the feeding chute 3 and the circle containing the cross-section of the primary mixer 1 is 45°. The dust concentration is detected by a dust concentration detection device on the dust collection pipeline, and the dust concentration at the gas inlet of the dust collector is found to be 0.3 g / m³. 3 After being treated by the dust collector, the dust concentration was 9 mg / m³. 3 This means that it can achieve ultra-low dust emissions.

[0129] Comparative Example 1

[0130] The system described in Example 17 is also used to control the dust generated in the sintering primary mixer system. However, in this example, the tangential angle α between the straight line containing the downstream section of the feed chute 3 and the circle containing the cross-section of the primary mixer 1 is 5°. The dust concentration is detected by a dust concentration detection device on the dust collection pipeline, and the dust concentration at the gas inlet of the dust collector is found to be 1.0 g / m³. 3 After being treated by the dust collector, the dust concentration was 30 mg / m³. 3 It still cannot meet the requirement of dust concentration of 20mg / m³ 3 Emission requirements within the country.

[0131] Comparative Example 2

[0132] The system described in Example 17 is also used to control the dust generated in the sintering primary mixer system. However, in this example, no protrusions are provided on the inner wall of the feed section of the primary mixer. The dust concentration is detected by a dust concentration detection device on the dust collection pipeline, and the dust concentration at the gas inlet of the dust collector is found to be 0.6 g / m³. 3 After being treated by the dust collector, the dust concentration was 18 mg / m³. 3 Although the final dust concentration requirement of 20 mg / m³ was met. 3 The emission requirements are met, but the dust concentration is much higher than the dust concentration when the primary mixer in Application Example 1 has protrusions.

[0133] Therefore, by taking corresponding measures at the front end, the end end, and during the mixing process of sintering raw materials in the sintering primary mixer system, the dust pollution of the entire system is greatly improved.

Claims

1. A sintering primary mixer composite dust treatment system, comprising a primary mixer (1), a feeding belt (2) and a discharging chute (3); the discharging chute (3) is arranged in the primary mixer (1); the feeding belt (2) extends into the feeding port of the primary mixer (1); the discharge end of the feeding belt (2) is connected with the feeding end of the discharging chute (3); the discharging chute (3) is arranged in the feeding section of the primary mixer (1); in the vertical direction, the discharging chute (3) is located between the feeding port of the primary mixer (1) and the lowest point of the inner wall of the primary mixer (1); a protrusion (101) is arranged on the inner wall of the primary mixer (1); the protrusion (101) is located at the feeding section of the primary mixer (1), and the protrusion (101) is arranged in a ring shape on the inner wall of the primary mixer (1); adjacent protrusions (101) are connected with each other, that is, a recess (102) is formed between adjacent two protrusions (101).

2. The composite dust management system of claim 1, wherein: The discharging chute (3) extends into the primary mixer (1) obliquely downward, and along the material conveying direction, the trend of the downstream section of the discharging chute (3) is consistent with the rotation direction of the primary mixer (1).

3. The composite dust management system of claim 2, wherein: The downstream section of the discharging chute (3) is arranged in a straight line, and the chord angle between the straight line where the downstream section of the discharging chute (3) is located and the circle where the cross section of the primary mixer (1) is located is α, wherein: the value range of α is 10-80°.

4. The composite dust management system of claim 3, wherein: The value range of α is 15-60°.

5. The composite dust management system of claim 4, wherein: The value range of α is 20-45°.

6. The composite dust management system of claim 3, wherein: The downstream section of the discharging chute (3) is arranged in an arc shape, and the arc of the downstream section of the discharging chute (3) is consistent with the lower 1 / 4 arc of the circle where the cross section of the primary mixer (1) is located.

7. The composite dust management system of any one of claims 1-6, wherein: In the primary mixer (1), along the material conveying direction, the height of the protrusion (101) located at the upstream section is greater than or equal to the height of the protrusion (101) located at the downstream section.

8. The composite dust management system of claim 7, wherein: The height of the protrusion (101) at each position decreases in turn.

9. The composite dust management system of any one of claims 1-6, 8, wherein: The protrusion (101) is arranged in an arc shape.

10. The composite dust management system of claim 9, wherein: The recess (102) is also arranged in an arc shape.

11. The composite dust management system of any one of claims 1-6, 8, 10, wherein: The primary mixer (1) is provided with a first water spraying device (4); and / or The upper portion of the feeding belt (2) is provided with a second water spraying device (5).

12. The composite dust management system of claim 11, wherein: The first water spraying device (4) is provided with a first water spraying amount detection device (401); and / or The second water spraying device (5) is located above the feeding end of the feeding belt (2).

13. The composite dust management system of claim 12, wherein: The second water spraying device (5) is provided with a second water spraying amount detection device (501).

14. The composite dust management system of any one of claims 1-6, 8, 10, 12-13, wherein: The system further comprises a dust suction hood (6), a dust collector (7), a dust fan (8) and a chimney (9); the dust suction hood (6) is arranged at the feeding port of the primary mixer (1); the dust removal pipeline (L) drawn from the dust suction hood (6) is connected to the chimney (9); the dust collector (7) and the dust fan (8) are arranged on the dust removal pipeline (L), and the dust collector (7) is located upstream of the dust fan (8).

15. The composite dust management system of claim 14, wherein: The dust removal pipeline (L) is provided with a dust concentration detection device (10).

16. The composite dust management system of claim 14, wherein: The dust collector (7) is a bag dust collector.

17. The composite dust management system of any of claims 1-6, 8, 10, 12-13, 15-16, wherein: The feeding port of the primary mixer (1) is provided with a first moisture detection device (1101); and / or A second moisture detection device (1102) is arranged at the discharge port of the primary mixer (1).

18. A sintering primary mixer composite dust treatment method using the system of any one of claims 1-17, the method comprising the steps of: 1) The sintering raw material is transported into the primary mixer (1) through the feeding belt (2), and the sintering raw material entering the primary mixer (1) is further discharged through the discharge chute (3) to reduce the generation of dust during the discharging process; 2) The sintering raw material on the discharge chute (3) rolls down to the feeding section of the primary mixer (1), and the sintering raw material contacts the protrusions (101) and recesses (102) arranged in the primary mixer (1), further reducing the generation of dust; 3) The first water spraying device (4) arranged in the primary mixer (1) sprays water on the sintering raw material, and the sintering raw material is mixed in the primary mixer (1) to obtain the sintering mixed material.

19. The composite dust management method of claim 18, wherein: In step 1), before the sintering raw material enters the primary mixer (1), the second water spraying device (5) arranged above the feeding belt (2) sprays water on the sintering raw material.

20. The composite dust management method of claim 18 or 19, wherein: The method further comprises: 4) The dust-containing gas generated during the discharging process enters the dust removal pipeline (L) through the dust collection cover (6), and is discharged to the chimney (9) after being purified by the dust remover (7); 5) During the dust removal process, the sintering raw material ash collected by the dust remover (7) is returned to the feeding belt (2).

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