Rotary hearth furnace material distribution system, rotary hearth furnace and rotary hearth furnace material distribution method

Abstract

This invention provides a rotary hearth furnace charging system, a rotary hearth furnace, and a rotary hearth furnace charging method. The rotary hearth furnace charging system includes multiple material guide chutes, a material layer height detection mechanism, and a control unit. The multiple material guide chutes charge material to the bottom of the rotary hearth furnace; the material layer height detection mechanism is used to detect the material layer height H at each material drop point on the bottom of the furnace. i The control unit is connected to the material guide chute and the material layer height detection mechanism respectively, and is used to: acquire the material layer height H at each material drop point at the bottom of the furnace detected by the material layer height detection mechanism. i And according to the material layer height H at each drop point i Control the feed width W of each feed chute i Where i = 1,...,n, and n is the number of the feed chutes. This invention can monitor the distribution of pellets at the furnace bottom in real time, thereby providing feedback on the material distribution in each feed chute and serving as a basis for further adjustments to the material flow distribution in each feed chute, thus improving the uniformity of material distribution in the rotary hearth furnace.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical technology, specifically relating to a rotary hearth furnace charging system and a rotary hearth furnace having the same, as well as a rotary hearth furnace charging method. Background Technology

[0002] Rotary hearth furnace process is currently the most widely used process for producing metallized pellets. It involves mixing iron-containing materials with carbon-containing materials, forming pellets, and placing them on the circular and rotating horizontal hearth of the rotary hearth furnace. As the furnace rotates, the pellets pass through different roasting zones, are heated and reduced, and are finally discharged from the furnace. After cooling, the metallized pellet product is obtained.

[0003] In the rotary hearth furnace process, pellets are laid flat on the furnace bottom and heated by radiant heat transfer from the furnace flames. To ensure sufficient reduction roasting of the pellets, it is best to control the uniform thickness of the feed layer in all areas of the furnace bottom, and maintain a feed layer height of 1-2 layers of pellets. If the feed layer in some areas of the furnace bottom is too thin, the effective utilization rate of the furnace bottom area will be reduced; if the feed layer in some areas of the furnace bottom is too thick, the pellets at the bottom of the feed layer in those areas will not be fully roasted, resulting in a decline in product quality and failure to meet production requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a rotary hearth furnace charging system, a rotary hearth furnace having the same, and a rotary hearth furnace charging method, so as to solve the problems of uneven charging and excessively thick or thin material layers in some areas of the prior art.

[0005] To achieve one of the above objectives, one embodiment of the present invention provides a rotary hearth furnace charging system, comprising:

[0006] Multiple feed chutes distribute material to the bottom of the rotary hearth furnace;

[0007] The material layer height detection mechanism is used to detect the material layer height H at each material drop point at the bottom of the furnace. i ;

[0008] The control unit is connected to the material guide chute and the material layer height detection mechanism respectively, and is used for:

[0009] The material layer height H at each material drop point at the bottom of the furnace is obtained from the material layer height detection mechanism. i And according to the material layer height H at each drop point i Control the feed width W of each feed chute i , where i = 1, ..., n, and n is the number of the feed chutes.

[0010] As a further improvement of one embodiment of the present invention, a distribution plate is provided at the inlet of the guide chute, and the distribution plate can rotate relative to the guide chute to adjust the feed width W of the guide chute. i The control unit is also used for:

[0011] Based on the material layer height H at each material drop point i Control the opening angle θ of the distribution plate at the inlet of each guide chute i .

[0012] As a further improvement to one embodiment of the present invention, the feed width W of the i-th guide chute is... i =SL·(cosθ) i -cosθ i-1 ),

[0013] Where S is the width of the guide chute, L is the length of the distribution plate, and θ i Let θ be the opening angle of the distribution plate at the inlet of the i-th guide chute. i-1 Let θ0 be the opening angle of the distribution plate at the inlet of the (i-1)th guide chute, where θ0 = 90°.

[0014] As a further improvement to one embodiment of the present invention, the rotary hearth furnace charging system further includes an alarm device, the control unit being connected to the alarm device and used for:

[0015] When the material layer height H at the material drop point i <H min And the feed width W of the guide chute corresponding to the material drop point i =W max If so, the alarm device will issue an alarm signal.

[0016] As a further improvement of one embodiment of the present invention, the rotary hearth furnace charging system further includes a charging port located at the outlet of the material guide chute, and there is a gap between the charging port and the material guide chute, the gap forming a mixing zone.

[0017] As a further improvement of one embodiment of the present invention, the material guide chutes are separated by material guide plates, and each material guide plate has a gap with the material feeding port, and the distance of the gap is 15-25cm.

[0018] As a further improvement of one embodiment of the present invention, the material layer height detection mechanism includes multiple detection units, wherein the detection unit is a weighted level gauge.

[0019] To achieve one of the above objectives, one embodiment of the present invention also provides a rotary hearth furnace, including a rotatable furnace bottom, and the rotary hearth furnace further includes the rotary hearth furnace charging system described above.

[0020] As a further improvement of one embodiment of the present invention, the rotary hearth furnace further includes an inner furnace wall and an outer furnace wall, the inner furnace wall and the outer furnace wall together form an annular furnace chamber, the material guide chute is located above the furnace chamber, and the discharge direction of the material guide chute is along the radial direction of the furnace chamber, and the material layer height detection mechanism is located above the furnace chamber and adjacent to the material guide chute.

[0021] As a further improvement of one embodiment of the present invention, the material guide chutes are separated by a material guide plate, the length of the material guide plate gradually increases along the circumference of the furnace, and the material distribution port extends from the inner furnace wall to the outer furnace wall.

[0022] As a further improvement of one embodiment of the present invention, the material guide chutes are separated by a material guide plate, and the material layer height detection mechanism includes 2n-1 detection units, each detection unit corresponding to the detection of the material layer height of a drop point. The 2i-1th detection unit is used to detect the material layer height of the drop point corresponding to the center of the i-th material guide chute, and the 2ith detection unit is used to detect the material layer height of the drop point corresponding to the material guide plate between the i-th material guide chute and the (i+1)-th material guide chute.

[0023] To achieve one of the above objectives, one embodiment of the present invention also provides a method for charging a rotary hearth furnace, comprising the steps of:

[0024] Detect the material layer height at each material drop point at the bottom of the furnace;

[0025] Determine the material layer height H at each drop point i Does the first preset condition (H) meet? min ≤H i ≤H max ;

[0026] If there is a material drop point, the height of the material layer H is... i If the first preset condition is not met, then determine the feed width W of the guide chute corresponding to the material drop point. i Does the second preset condition (W) meet? min <W i <W max ;

[0027] If the feed width W of the guide chute corresponding to the material drop point i The second preset condition is met, and the material layer height H at the material drop point is [missing information]. i >H max Then control the feed width W of the guide chute corresponding to the material drop point. i Decrease;

[0028] If the feed width W of the guide chute corresponding to the material drop point iThe second preset condition is met, and the material layer height H at the material drop point is [missing information]. i <H min Then control the feed width W of the guide chute corresponding to the material drop point. i Increase.

[0029] As a further improvement of one embodiment of the present invention, the feeding width W of the guide chute corresponding to the material drop point is controlled. i Specifically, reducing the angle of the material distribution plate at the inlet of the material guide chute is controlled to be smaller;

[0030] The feeding width W of the guide chute corresponding to the material drop point is controlled. i Specifically, this includes increasing the opening angle of the material distribution plate at the inlet of the material guide chute.

[0031] As a further improvement to one embodiment of the present invention, the rotary hearth furnace charging method further includes the following steps:

[0032] If there is a material drop point, the height of the material layer H is... i <H min And the feed width W of the guide chute corresponding to the material drop point i =W max If so, it is judged as a fault and the alarm device is controlled to issue an alarm signal;

[0033] Upon receiving an alarm signal, the system checks whether the material guide chute and the material distribution port are blocked.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows: The rotary hearth furnace charging system, the rotary hearth furnace having the same, and the rotary hearth furnace charging method of the present invention can monitor the distribution of pellets at the furnace bottom in real time by detecting the material layer height at each material drop point. This provides feedback on the material distribution of each guide chute and serves as a basis for adjusting the material flow distribution of each guide chute in the next step. This allows for targeted adjustment of the material flow of the guide chute corresponding to each material drop point based on the material layer height at each drop point, avoiding empty areas and areas with excessively thick material layers. This improves the uniformity of material distribution in the rotary hearth furnace, and enhances production efficiency, product quality, and automation. Attached Figure Description

[0035] Figure 1 This is a partial three-dimensional structural schematic diagram of a rotary hearth furnace according to an embodiment of the present invention;

[0036] Figure 2 yes Figure 1 Top view;

[0037] Figure 3 This is a partial structural cross-sectional view of a rotary hearth furnace according to an embodiment of the present invention;

[0038] Figure 4 It is a partial structural schematic diagram of a fabric system according to an embodiment of the present invention. Specific Embodiments

[0039] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included within the protection scope of the present invention.

[0040] Refer Figures 1 to 3 As shown, an embodiment of the present invention provides a rotary hearth furnace 100 for roasting and reducing pellets to produce metallized pellets.

[0041] The rotary hearth furnace 100 includes a furnace body 1 and a rotatable furnace bottom 2. The furnace body 1 includes an inner furnace wall 11 and an outer furnace wall 12. The inner furnace wall 11 and the outer furnace wall 合围出呈环形的炉膛,炉底2也呈环形,炉膛位于炉底2的上方,炉底2可相对炉膛转动,从而可以使平铺于炉底2的球团在随炉底2转动的过程中经过不同的焙烧区,进行加热还原,形成金属化球团成品。

[0042] Combined Figure 4 , the rotary hearth furnace cloth system 3 is further included. The cloth system 3 can specifically be used to control the feeding width of each material guiding chute 31 to facilitate regulating the cloth uniformity of the rotary hearth furnace 100.

[0043] The rotary hearth furnace cloth system 3 includes a material guiding chute 31, a material layer height detection mechanism 32, and a control unit.

[0044] Among them, a plurality of material guiding chutes 31 are provided and are used to cloth the furnace bottom 2 of the rotary hearth furnace 100. The pellet material flow is divided into multiple strands through the plurality of material guiding chutes 31 and then falls onto the furnace bottom 2. As the furnace bottom 2 rotates, it is finally distributed over the entire furnace bottom 2, so as to mass-produce metallized pellet products.

[0045] The material layer height detection mechanism 32 is used to detect the material layer height H at each material dropping point of the furnace bottom 2 i . The material layer height H i reflects the pellet distribution at each material dropping point. A large material layer height indicates pellet accumulation at that material dropping point, while a small material layer height indicates过少或者空缺 of pellets at that material dropping point. By detecting the material layer height at each material dropping point of the furnace bottom 2, the pellet distribution and distribution uniformity of the furnace bottom 2 can be fed back.

[0046] The control unit is respectively connected to the material guiding chute 31 and the material layer height detection mechanism 32 and is used for:

[0047] Obtain the material layer height H at each material dropping point of the furnace bottom 2 detected by the material layer height detection mechanism 32 It should be noted that there are some unclear or incorrect expressions in the original text, such as "合围出呈环形的炉膛" which is not a proper description. The above translation is based on the existing content as accurately as possible.i And according to the material layer height H at each drop point i Control the feed width W of each feed chute 31 i , where i = 1, ..., n, and n is the number of feed chutes 31.

[0048] In summary, by detecting the material layer height at each dropping point of the furnace bottom 2 through the material layer height detection mechanism 32, the distribution of pellets in the furnace bottom 2 can be monitored in real time. This provides feedback on the material distribution of each guide chute 31 and serves as a basis for adjusting the material flow distribution of each guide chute 31 in the next step. This allows for targeted adjustment of the material flow of the guide chute 31 corresponding to each dropping point based on the material layer height, avoiding empty areas and areas with excessively thick material layers. This improves the uniformity of material distribution in the rotary hearth furnace 100, thereby increasing production efficiency, product quality, and automation.

[0049] Furthermore, the control unit is also used for:

[0050] Determine the material layer height H at each drop point i Does the first preset condition (H) meet? min ≤H i ≤H max ;

[0051] If there is a material drop point, the height of the material layer H is... i If the first preset condition is not met, then the feed width W of the guide chute 31 corresponding to the material drop point is determined. i Does the second preset condition (W) meet? min <W i <W max ;

[0052] If the feeding width W of the guide chute 31 corresponding to the material drop point is... i The second preset condition is met, and the material layer height H at the material drop point is [missing information]. i >H max Then control the feeding width W of the guide chute 31 corresponding to the material drop point. i Decrease;

[0053] If the feeding width W of the guide chute 31 corresponding to the material drop point is... i The second preset condition is met, and the material layer height H at the material drop point is [missing information]. i <H min Then control the feeding width W of the guide chute 31 corresponding to the material drop point. i Increase.

[0054] Among them, H min and H max These are the lower and upper threshold values ​​for the material layer height at each material drop point in furnace bottom 2, respectively.min and W max These are the minimum and maximum threshold values ​​for the feed width of the feed chute 31, respectively.

[0055] If there is a material drop point, the height of the material layer H is... i >H max And the feeding width W of the guide chute 31 corresponding to the material drop point i If the material layer at the drop point is too thick, it indicates that the material layer is between the preset minimum threshold and the maximum threshold. In this case, the feeding width of the guide chute 31 corresponding to the drop point can be reduced to decrease the material layer thickness at the drop point.

[0056] If there is a material drop point, the height of the material layer H is... i <H min And the feeding width W of the guide chute 31 corresponding to the material drop point i If the material layer at the drop point is too thin or even lacking material, and the feed width of the guide chute 31 corresponding to the drop point is increased, the material layer thickness at the drop point can be increased.

[0057] In this way, the thickness of the material layer in each area of ​​the furnace bottom 2 can be adjusted in real time, thereby improving the uniformity of material distribution. On the one hand, it can avoid the situation where the material distribution in some areas of the furnace bottom 2 is too thin, resulting in a reduction in the effective utilization rate of the furnace bottom 2 area; on the other hand, it can solve the problem of insufficient roasting of pellets in the lower part of the material layer in some areas of the furnace bottom 2 due to the material distribution being too thick.

[0058] In this embodiment, the material guide chute 31 is located above the furnace chamber, and the discharge direction of the material guide chute 31 is along the radial direction of the furnace chamber. In this way, the material guide chute 31 can be distributed in the radial direction of the entire furnace chamber. During the rotation of the furnace bottom 2, the material flow is distributed from each material guide chute 31 to the furnace bottom 2, thereby realizing the distribution of material throughout the entire furnace bottom 2.

[0059] Furthermore, adjacent material guide chutes 31 are separated by material guide plates 34, the length of which gradually increases along the circumference of the furnace. This allows the outlets 311 of each material guide chute 31 to extend from the inner furnace wall 11 to the outer furnace wall 12, ensuring that material is distributed to all areas of the furnace bottom 2.

[0060] See Figures 1 to 4 In this embodiment, there are 7 material guide chutes, i.e., n=7. The discharge ports 311 of the 7 material guide chutes are arranged sequentially from the inner furnace wall 11 to the outer furnace wall 12. According to the order of the discharge ports 311 of the material guide chutes from the inner furnace wall 11 to the outer furnace wall 12, the 7 material guide chutes are designated as the 1st, 2nd, ..., 7th material guide chutes. As the converter rotates once, the entire furnace bottom 2 can be materialed.

[0061] Of course, in other embodiments, the number of material guide chutes 31 can also be set according to actual needs, specifically according to the radius of the furnace, the width of the material guide chutes 31, etc.

[0062] Preferably, the material layer height detection mechanism 32 is located above the furnace and adjacent to the material guide chute 31, so as to detect and provide feedback on the material distribution of each material guide chute 31 to the corresponding area of ​​the furnace bottom 2 in a timely manner, so as to adjust the feeding width of the material guide chute 31 in a timely manner, thereby improving the uneven material distribution of the rotary hearth furnace 100.

[0063] Preferably, the material layer height detection mechanism 32 is located behind the material guide chute 31, where "behind" refers to the rear of the furnace bottom 2 along the rotation direction.

[0064] Furthermore, a distribution plate 33 is provided at the inlet of the feed chute 31. The distribution plate 33 can rotate relative to the feed chute 31 to adjust the feed width W of the feed chute 31. i .

[0065] The control unit is also used to: determine the material layer height H at each drop point i Control the opening angle θ of the distribution plate 33 at the inlet of each material guide chute 31 i .

[0066] By controlling the opening angle θ of the distribution plate 33 at the inlet of each material guide chute 31 i The feed width W of each guide chute 31 can be controlled. i This allows for adjustment of the material flow rate in each guide chute 31, thereby achieving the desired material flow rate based on the material layer height H at each drop point. i The feed width W of the feed chute 31 i Adjustments were made.

[0067] The angle at which the material distribution plate 33 rotates relative to the guide chute 31 corresponds to the opening angle of the material distribution plate 33, and the opening angle θ of the material distribution plate 33 is... i =60°~120°.

[0068] In this embodiment, the end of the distribution plate of the i-th guide chute facing the guide chute is located between the i-th guide chute and the (i+1)-th guide chute, and the distribution plate of the i-th guide chute is correspondingly arranged with the guide plate between the i-th guide chute and the (i+1)-th guide chute, θ i =60°~120°, meaning that the angle between the distribution plate of the i-th material guide chute and the guide plate between the i-th and (i+1)-th material guide chute is 150°~210°. Thus, the distribution plate 33 at the inlet of each material guide chute 31 can rotate relative to its corresponding guide plate 34 to adjust the material flow rate of each material guide chute 31, thereby adjusting the material distribution at each material drop point in the furnace bottom 2, i.e., the material layer height.

[0069] Furthermore, the feed width W of the i-th feed chute i =SL·(cosθ) i -cosθ i-1 );

[0070] Where S is the width of the guide chute 31, L is the length of the distribution plate 33, and θ i Let θ be the opening angle of the distribution plate at the inlet of the i-th guide chute. i-1 Let θ0 be the opening angle of the distribution plate at the inlet of the (i-1)th guide chute, where θ0 = 90°.

[0071] Furthermore, the material layer height detection mechanism 32 includes multiple detection units 321. In this embodiment, there are 2n-1 detection units 321, each detection unit 321 corresponding to detect the material layer height of one drop point. The 2i-1th detection unit 321 is used to detect the material layer height of the drop point corresponding to the center of the ith guide chute 31, and the 2ith detection unit 321 is used to detect the material layer height of the drop point corresponding to the guide plate 34 between the ith guide chute 31 and the (i+1)th guide chute 31. In this way, each guide chute 31 corresponds to the detection of the material layer height of two drop points: one detects the material layer height of the drop point corresponding to the center of the guide chute 31, and the other detects the material layer height of the drop point corresponding to the guide plate 34 between two adjacent guide chute 31s. This not only avoids the material layer at the drop point corresponding to the center of the guide chute 31 being too thick, but also avoids the occurrence of material shortage or excessively thin material layer at the drop point corresponding to the guide plate 34 between two adjacent guide chute 31s.

[0072] Taking this embodiment as an example, 13 detection units 321 are set for the 7 material guide chutes 31. Among them, 7 detection units 321 are used to detect the material layer height of the drop point corresponding to the center of the 7 material guide chutes 31, and the other 6 detection units 321 are used to detect the material layer height of the drop point corresponding to the 6 guide plates 34 between the 7 material guide chutes 31.

[0073] Preferably, the detection unit 321 adopts a weighted level gauge, which can accurately measure the material level without being affected by the high temperature and dust in the furnace.

[0074] Furthermore, the control unit is also used for:

[0075] If the feeding width W of the guide chute 31 corresponding to the material drop point is... i The second preset condition is met, and the material layer height H at the material drop point is [missing information]. i >H max If the angle of the material distribution plate 33 at the inlet of the material guide chute 31 is increased, then the opening angle of the material distribution plate 33 at the inlet of the material guide chute 31 will be increased.

[0076] If the feeding width W of the guide chute 31 corresponding to the material drop point is... i The second preset condition is met, and the material layer height H at the material drop point is [missing information]. i <H min Then control the feeding width W of the guide chute 31 corresponding to the material drop point. i Increase.

[0077] In other words, by controlling the opening angle of the distribution plate 33 at the inlet of the material guide chute 31, the feed width of the material guide chute 31 can be adjusted, thereby quickly and effectively adjusting the material layer height at each drop point of the furnace bottom 2 to improve the uniformity of material distribution.

[0078] Furthermore, the rotary hearth furnace charging system 3 also includes a motor 35 and a computing unit. The motor 35 drives the distribution plate 33 to rotate, thereby improving the automation level of the rotary hearth furnace charging system 3 and achieving precise control of the rotation angle of the distribution plate 33. The computing unit is used to process W... i With θ i θ i-1 The conversion between the two is performed to facilitate the control unit in controlling the rotation angle of the material distribution plate 33.

[0079] Preferably, one revolution of the motor 35 corresponds to one degree of rotation of the material distribution plate 33, thereby improving control efficiency.

[0080] Furthermore, the control unit is connected to the motor 35 and is used for:

[0081] Based on the material layer height H at each material drop point i Control the number of rotations of the motor 35 corresponding to the material distribution plate 33 at the inlet of each material guide chute 31.

[0082] See Figures 1 to 2 Furthermore, the rotary hearth furnace charging system 3 also includes a charging port 36 located at the outlet of the charging chute 31. There is a gap between the charging port 36 and the charging chute 31, which can form a mixing zone. The material flow from each charging chute 31 can be mixed in this mixing zone, thereby avoiding the occurrence of material shortage at the locations where the charging plates 34 are set between the charging chute 31. This also avoids the situation where the material layer at the location of the furnace bottom 2 corresponding to the charging plates 34 is too thin or lacks material, which would lead to a reduction in the effective utilization rate of the furnace bottom 2 area and low production efficiency.

[0083] Preferably, there is a gap between each guide plate 34 and the material outlet 36, and the distance of the gap is 15-25cm. The setting of the gap can form a mixing zone between the material outlet 36 and all the guide chutes 31, and the mixing zone has enough space to allow the material flow to be fully mixed in the mixing zone, thereby avoiding the occurrence of material shortage.

[0084] Furthermore, the rotary hearth furnace charging system 3 also includes an alarm device, and the control unit is connected to the alarm device and is used for:

[0085] When the material layer height H at the material drop point i <H min And the feeding width W of the guide chute 31 corresponding to the material drop point i =W max If the system malfunctions, the alarm device will issue an alarm signal to remind the operator to check for system failure.

[0086] Among them, H min H represents the lower limit threshold for the material layer height at each material drop point in furnace bottom 2. i <H min This indicates that the material layer height at the material drop point is lower than the minimum standard, indicating a shortage or lack of material, which is detrimental to improving the effective utilization rate of the furnace bottom area; W max W is the maximum threshold value for the feed width of the feed chute 31. i =W max This indicates that the feed width of the feed chute 31 has reached its maximum value. In W i =W max Material layer height H i <H min If the material layer is too thin, it indicates a system malfunction, and it is necessary to check whether there is any blockage in the material guide chute 31 and the material distribution port 36.

[0087] One embodiment of the present invention also provides a rotary hearth furnace feeding method for controlling the feeding width of each feeding chute 31 to achieve uniform feeding of the rotary hearth furnace 100, improve the effective utilization rate of the furnace bottom area 2, and improve production efficiency and product quality.

[0088] Below, in conjunction with Figures 1 to 4 The rotary hearth furnace equipment shown herein introduces a preferred embodiment of the rotary hearth furnace charging method.

[0089] The rotary hearth furnace charging method includes the following steps:

[0090] Detect the material layer height at each material drop point on the furnace bottom 2;

[0091] Determine the material layer height H at each drop point i Does the first preset condition (H) meet? min ≤H i ≤H max ;

[0092] If there is a material drop point, the height of the material layer H is... i If the first preset condition is not met, then the feed width W of the guide chute 31 corresponding to the material drop point is determined. iDoes the second preset condition (W) meet? min <W i <W max ;

[0093] If the feeding width W of the guide chute 31 corresponding to the material drop point is... i The second preset condition is met, and the material layer height H at the material drop point is [missing information]. i >H max Then control the feeding width W of the guide chute 31 corresponding to the material drop point. i Decrease;

[0094] If the feeding width W of the guide chute 31 corresponding to the material drop point is... i The second preset condition is met, and the material layer height H at the material drop point is [missing information]. i <H min Then control the feeding width W of the guide chute 31 corresponding to the material drop point. i Increase.

[0095] In this way, the thickness of the material layer in each area of ​​the furnace bottom 2 can be adjusted in real time, thereby improving the uniformity of material distribution. On the one hand, it can avoid the situation where the material distribution in some areas of the furnace bottom 2 is too thin, resulting in a reduction in the effective utilization rate of the furnace bottom 2 area; on the other hand, it can solve the problem of insufficient roasting of pellets in the lower part of the material layer in some areas of the furnace bottom 2 due to the material distribution being too thick.

[0096] Furthermore, the feed width W of the guide chute 31 corresponding to the controlled drop point is... i Specifically, reducing the angle of the material distribution plate 33 at the inlet of the material guide chute 31 is reduced.

[0097] The feeding width W of the guide chute 31 corresponding to the material drop point is controlled. i Specifically, this includes increasing the opening angle of the material distribution plate 33 at the inlet of the material guide chute 31.

[0098] In other words, by controlling the opening angle of the distribution plate 33 at the inlet of the material guide chute 31, the feed width of the material guide chute 31 can be adjusted, thereby quickly and effectively adjusting the material layer height at each drop point of the furnace bottom 2 to improve the uniformity of material distribution.

[0099] Furthermore, the rotary hearth furnace charging method also includes the following steps:

[0100] If there is a material drop point, the height of the material layer H is... i <H min And the feeding width W of the guide chute 31 corresponding to the material drop point i =W max If so, it is judged as a fault and the alarm device is controlled to issue an alarm signal;

[0101] Upon receiving an alarm signal, the system checks whether the material guide chute 31 and the material distribution port 36 are blocked.

[0102] H i <H min This indicates that the material layer height at the material drop point is lower than the minimum standard, indicating a shortage or lack of material, which is detrimental to improving the effective utilization rate of the furnace bottom area; W max W is the maximum threshold value for the feed width of the feed chute 31. i =W max This indicates that the feed width of the feed chute 31 has reached its maximum value. In W i =W max Material layer height H i <H min If the material layer is too thin, it indicates a system malfunction. It is necessary to check whether there is any blockage in the material guide chute 31 and the material distribution port 36, so as not to affect production efficiency.

[0103] In summary, compared with the prior art, the rotary hearth furnace charging system 3, the rotary hearth furnace 100 having it, and the rotary hearth furnace charging method of the present invention have the following beneficial effects: By detecting the material layer height at each material drop point of the furnace bottom 2, the distribution of pellets at the furnace bottom 2 can be monitored in real time, thereby providing feedback on the material distribution of each guide chute 31 and providing a basis for adjusting the material flow distribution of each guide chute 31 in the next step. This allows for targeted adjustment of the material flow of the guide chute 31 corresponding to each material drop point based on the material layer height at each drop point, avoiding empty areas and areas with excessively thick material layers, thereby improving the uniformity of material distribution in the rotary hearth furnace 100, and improving production efficiency, product quality, and automation level.

[0104] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0105] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotary hearth furnace, comprising a rotatable furnace bottom, characterized in that, The rotary hearth furnace also includes an inner furnace wall, an outer furnace wall, and a rotary hearth furnace charging system. The inner furnace wall and the outer furnace wall together form an annular furnace chamber. The rotary hearth furnace charging system includes... Multiple feed chutes are used to distribute material onto the furnace bottom. A distribution plate is installed at the inlet of each feed chute, and the distribution plate can rotate relative to the feed chute to adjust the feed width W of the feed chute. i The material guide chute is located above the furnace chamber, and the discharge direction of the material guide chute is along the radial direction of the furnace chamber. The material guide chute is separated by a guide plate, and the length of the guide plate gradually increases along the circumference of the furnace chamber. The material layer height detection mechanism is used to detect the material layer height H at each material drop point at the bottom of the furnace. i It is located above the furnace and adjacent to the feed chute; The material feeding port is located at the outlet of the material guiding chute. The material feeding port extends from the inner furnace wall to the outer furnace wall. There is a gap between the material feeding port and the material guiding chute. The gap forms a mixing zone. There is a gap between each material guiding plate and the material feeding port. The distance of the gap is 15~25cm. The control unit is connected to the material guide chute and the material layer height detection mechanism respectively, and is used for: The material layer height H at each material drop point at the bottom of the furnace is obtained from the material layer height detection mechanism. i And according to the material layer height H at each drop point i Control the feed width W of each feed chute i and the opening angle θ of the distribution plate at the inlet of each guide chute. i , where i=1,...,n, and n is the number of the feed chutes.

2. The rotary hearth furnace according to claim 1, characterized in that, The feed width W of the i-th feed chute i =SL·(cosθ i -cosθ i-1 ), Where S is the width of the guide chute, L is the length of the distribution plate, and θ i Let θ be the opening angle of the distribution plate at the inlet of the i-th guide chute. i-1 Let θ0 be the opening angle of the distribution plate at the inlet of the (i-1)th guide chute, where θ0 = 90°.

3. The rotary hearth furnace according to claim 1, characterized in that, It also includes an alarm device, the control unit being connected to the alarm device and used for: When the material layer height H at the material drop point i <H min And the feed width W of the guide chute corresponding to the material drop point i =W max If so, the alarm device will issue an alarm signal.

4. The rotary hearth furnace according to claim 1, characterized in that, The material layer height detection mechanism includes multiple detection units, and the detection unit is a weighted level gauge.

5. The rotary hearth furnace according to claim 1, characterized in that, The material layer height detection mechanism includes 2n-1 detection units. Each detection unit is responsible for detecting the material layer height at a drop point. The 2i-1th detection unit is used to detect the material layer height at the drop point corresponding to the center of the i-th guide chute. The 2ith detection unit is used to detect the material layer height at the drop point corresponding to the guide plate between the i-th guide chute and the (i+1)-th guide chute.

6. A method for charging a rotary hearth furnace, characterized in that, The rotary hearth furnace is the rotary hearth furnace as described in any one of claims 1 to 5, and the material feeding method includes the following steps. Detect the material layer height at each material drop point at the bottom of the furnace; Determine the material layer height H at each drop point i Does the first preset condition (H) meet? min ≤H i ≤H max ; If there is a material drop point, the height of the material layer H i If the first preset condition is not met, then determine the feed width W of the guide chute corresponding to the material drop point. i Does the second preset condition (W) meet? min <W i <W max ; If the feed width W of the guide chute corresponding to the material drop point i The second preset condition is met, and the material layer height H at the drop point is... i >H max Then control the feed width W of the guide chute corresponding to the material drop point. i Decrease; If the feed width W of the guide chute corresponding to the material drop point i The second preset condition is met, and the material layer height H at the drop point is... i <H min Then control the feed width W of the guide chute corresponding to the material drop point. i Increase.

7. The rotary hearth furnace charging method according to claim 6, characterized in that, The feeding width W of the guide chute corresponding to the material drop point is controlled. i Specifically, reducing the angle of the material distribution plate at the inlet of the material guide chute is controlled to be smaller; The feeding width W of the guide chute corresponding to the material drop point is controlled. i Specifically, this includes increasing the opening angle of the material distribution plate at the inlet of the material guide chute.

8. The rotary hearth furnace charging method according to claim 6, characterized in that, It also includes steps, If there is a material drop point, the height of the material layer H i <H min And the feed width W of the guide chute corresponding to the material drop point i =W max If so, it is judged as a fault and the alarm device is controlled to issue an alarm signal; Upon receiving an alarm signal, the system checks whether the material guide chute and the material distribution port are blocked.

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