A rotary kiln sealing water-cooled head and its optimized design method

Abstract

The present invention relates to the technical field of rotary kilns, and discloses a rotary kiln sealed water-cooled head and an optimization design method thereof, including: a head main body, on which there is a water-cooled channel for cooling the outer side surface of the head main body, and the length of the head main body meets the design conditions; the design conditions are: the working temperature of the sealing ring assembly arranged outside the head main body is less than the set working temperature, and its highest working temperature is a preset percentage of the set working temperature. By restricting the length of the head main body through the design conditions, while reducing the length of the head main body, the physical properties of the sealing ring assembly under any operating condition can be ensured, the sealing effect and its service life can be guaranteed; moreover, after the length of the head main body is reduced, its weight can be reduced and the cost of manufacturing the sealed water-cooled head can be lowered; compared with the prior art, although the temperature of the sealing ring assembly after cooling has increased, it does not affect its physical properties, and at the same time, the cooling energy consumption of the water-cooled channel can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary kilns, and more specifically, to a rotary kiln sealed water-cooled head and an optimization design method thereof. Background Art

[0002] The water-cooled head of a rotary kiln is an important component in the rotary kiln equipment. It is located at both ends of the rotary kiln and mainly functions to seal the kiln body, prevent material leakage, and cool the kiln head. The water-cooled head is cooled by circulating water, which can effectively reduce the temperature of the kiln head, protect the sealing ring from being damaged by high temperature, and improve the service life at the same time.

[0003] The existing water-cooled head design uses inner water cooling to reduce the operating temperature of the sealing ring. Generally, a lower temperature is beneficial to improving the sealing effect of the sealing ring. Specifically, the influence of different temperatures on the performance of the sealing ring is as follows:

[0004] At 100 °C, the silicone rubber sealing ring can maintain a physical strength of up to 85%.

[0005] At 150 °C, the silicone rubber sealing ring can maintain a physical strength of up to 75%.

[0006] At 200 °C, the silicone rubber sealing ring can generally be maintained at a physical strength of 60% - 70%.

[0007] At about 250 °C, the silicone rubber sealing ring can still maintain a physical strength of about 50%.

[0008] In the prior art, in order to improve the sealing effect of the sealing ring, the water-cooled head needs to work at a lower temperature, so that the length of the water-cooling structure of the water-cooled head needs to adapt to the size of the sealing ring to ensure the requirements of the sealing ring for the overall length of the water-cooled head. However, the length of the above-mentioned water-cooled head will increase its own weight, thereby increasing the manufacturing cost of the water-cooled head, and the energy consumption of water cooling will also increase accordingly.

[0009] Therefore, it is necessary to propose a rotary kiln sealed water-cooled head and an optimization design method thereof to at least partially solve the problems existing in the prior art. Summary of the Invention

[0010] To at least partially solve the above problems, the present invention provides a rotary kiln sealed water-cooled head, including: a head body, on which a water-cooling channel is provided for cooling the outer side surface of the head body, and the length of the head body satisfies the design conditions; the design conditions are: the operating temperature of the sealing ring assembly provided on the outer side of the head body is less than the set operating temperature, and its highest operating temperature is a preset percentage of the set operating temperature.

[0011] Preferably, the head body includes: a heat-insulating inner ring, outside which a sealing outer ring is sleeved, one end of the heat-insulating inner ring and one end of the sealing outer ring being connected by a first heat-insulating side ring; a water-cooling inner ring is sleeved between the heat-insulating inner ring and the sealing outer ring, one end of the water-cooling inner ring and the other end of the heat-insulating inner ring being connected by a second heat-insulating side ring, a water-cooling retaining ring being provided between the other end of the water-cooling inner ring and the sealing outer ring, a water-blocking fixing ring being provided outside the other end of the sealing outer ring, and a mounting flange being provided outside one end of the water-cooling inner ring.

[0012] Preferably, an annular water-cooling channel is formed among the water-cooling inner ring, the sealing outer ring and the water-cooling retaining ring.

[0013] Preferably, heat-insulating fillers are provided between the water-cooling inner ring and the heat-insulating inner ring and between the sealing outer ring and the heat-insulating inner ring.

[0014] Preferably, the set working temperature is 100 degrees Celsius.

[0015] Preferably, the distance between the sealing ring assembly and the water-blocking fixing ring is a first set distance;

[0016] The condition satisfied by the first set distance is that when the water-cooling channel does not axially coincide with the first sealing ring, the highest working temperature reached by the sealing ring assembly is a preset percentage of the set working temperature;

[0017] Wherein, the sealing ring assembly includes: a first sealing ring and a second sealing ring, and the second sealing ring is arranged axially close to the water-cooling channel.

[0018] Preferably, the distance between the first heat-insulating side ring and the water-cooling retaining ring is a second set distance;

[0019] The condition satisfied by the second set distance is that when the furnace tube on which the head body is installed is at any operating temperature, it does not affect the cooling effect of the water-cooling channel on the sealing ring assembly, so that the working temperature of the sealing ring assembly is always less than the set working temperature.

[0020] Preferably, the axial length of the water-cooling channel is a third set distance;

[0021] The condition satisfied by the third set distance is that when the water-cooling channel does not axially coincide with the first sealing ring, the highest working temperature reached by the sealing ring assembly is a preset percentage of the set working temperature.

[0022] An optimization design method for a rotary kiln sealing water-cooled head, which is applied to the rotary kiln sealing water-cooled head of the present invention, includes:

[0023] Establish an initial three-dimensional model of the assembly of the head body and the sealing ring assembly;

[0024] Optimize the initial three-dimensional model, and perform simulation analysis on the optimized three-dimensional model under multiple different operating conditions to obtain the optimized simulation analysis results; among them, the operating conditions include: the operating temperature of the furnace tube where the head body is installed; the optimized simulation analysis results include: the maximum working temperature of the seal ring assembly under multiple different operating conditions;

[0025] Judge whether the maximum working temperature of the seal ring assembly reaches a preset percentage of the set working temperature;

[0026] If not, continue to optimize and perform simulation analysis on the optimized three-dimensional model until the maximum working temperature of the seal ring assembly in the simulation analysis results reaches a preset percentage of the set working temperature;

[0027] If so, the minimum length of the corresponding head body is the final optimization result.

[0028] Preferably, when performing optimization and simulation analysis, the optimization design variables, optimization constraint conditions, and optimization objectives are as follows:

[0029] The optimization design variables include: the distance between the first heat insulation side ring and the water-cooled baffle ring, and the axial length of the water-cooled channel;

[0030] The optimization constraint conditions include: when the water-cooled channel does not coincide with the first seal ring, the maximum working temperature reached by the seal ring assembly is a preset percentage of the set working temperature, and, under any operating condition, the working temperature of the seal ring assembly is always less than the set working temperature;

[0031] The optimization objective includes: minimizing the length of the head body.

[0032] Compared with the prior art, the present invention at least includes the following beneficial effects:

[0033] For the rotary kiln sealed water-cooled head and its optimization design method of the present invention, by constraining the length of the head body through design conditions, while reducing the length of the head body, it can ensure the physical properties of the seal ring assembly under any operating condition of the furnace tube, ensure the sealing effect and the service life of the seal ring assembly; and, after the length of the head body is reduced, its weight can be reduced, and the cost of manufacturing the sealed water-cooled head can be reduced; compared with the prior art, although the temperature of the seal ring assembly after cooling has increased, it does not affect its physical properties, and at the same time, the cooling energy consumption of the water-cooled channel can be reduced.

[0034] For the rotary kiln sealed water-cooled head and its optimization design method of the present invention, other advantages, objectives, and features of the present invention will be partially reflected by the following description, and partially will be understood by those skilled in the art through the research and practice of the present invention. Brief Description of the Drawings

[0035] The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the accompanying drawings:

[0036] Figure 1 It is a schematic structural diagram of the rotary kiln sealing water-cooled head described in the present invention installed at the furnace head;

[0037] Figure 2 It is a front structural schematic diagram of the rotary kiln sealing water-cooled head described in the present invention installed at the furnace head;

[0038] Figure 3 is Figure 2 a schematic cross-sectional view at A-A;

[0039] Figure 4 is Figure 3 an enlarged structural schematic diagram at B;

[0040] Figure 5 It is a schematic cross-sectional structure diagram of the rotary kiln sealing water-cooled head described in the present invention;

[0041] Figure 6 It is a structural schematic diagram of the rotary kiln sealing water-cooled head described in the present invention;

[0042] Figure 7 It is a schematic diagram for optimization and simulation analysis in the optimization design method of the rotary kiln sealing water-cooled head described in the present invention;

[0043] Figure 8 It is a schematic diagram of simulation analysis of the water-cooled head in the prior art at an operating temperature of 1200 °C;

[0044] Figure 9 It is a schematic diagram of simulation analysis of the water-cooled head in the prior art at an operating temperature of 1100 °C;

[0045] Figure 10 It is a schematic diagram of simulation analysis of the water-cooled head in the prior art at an operating temperature of 1000 °C;

[0046] Figure 11 It is a schematic diagram of simulation analysis of the water-cooled head in the prior art at an operating temperature of 900 °C;

[0047] Figure 12 It is a schematic diagram of simulation analysis of the water-cooled head in the prior art at an operating temperature of 800 °C;

[0048] Figure 13 It is a schematic diagram of simulation analysis of the water-cooled head in the prior art at an operating temperature of 700 °C;

[0049] Figure 14Schematic diagram of the simulation analysis of the water-cooled head in the prior art at an operating temperature of 600 °C;

[0050] Figure 15 Schematic diagram of the simulation analysis of the water-cooled head in the prior art at an operating temperature of 500 °C;

[0051] Figure 16 Schematic diagram of the simulation analysis of the water-cooled head in the prior art at an operating temperature of 400 °C;

[0052] Figure 17 Schematic diagram of the simulation analysis of the optimized water-cooled head of the present invention at an operating temperature of 1200 °C;

[0053] Figure 18 Schematic diagram of the simulation analysis of the optimized water-cooled head of the present invention at an operating temperature of 1100 °C;

[0054] Figure 19 Schematic diagram of the simulation analysis of the optimized water-cooled head of the present invention at an operating temperature of 1000 °C;

[0055] Figure 20 Schematic diagram of the simulation analysis of the optimized water-cooled head of the present invention at an operating temperature of 900 °C;

[0056] Figure 21 Schematic diagram of the simulation analysis of the optimized water-cooled head of the present invention at an operating temperature of 800 °C;

[0057] Figure 22 Schematic diagram of the simulation analysis of the optimized water-cooled head of the present invention at an operating temperature of 700 °C;

[0058] Figure 23 Schematic diagram of the simulation analysis of the optimized water-cooled head of the present invention at an operating temperature of 600 °C;

[0059] Figure 24 Schematic diagram of the simulation analysis of the optimized water-cooled head of the present invention at an operating temperature of 500 °C;

[0060] Figure 25 Schematic diagram of the simulation analysis of the optimized water-cooled head of the present invention at an operating temperature of 400 °C. Detailed implementation manners

[0061] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, so that those skilled in the art can implement it according to the description in the specification.

[0062] It should be understood that the terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0063] As Figures 1 - 4 shown, the present invention provides a rotary kiln sealing water-cooled head, comprising: a head main body 1, on which a water-cooling channel 2 for cooling the outer side surface of the head main body 1 is provided, and the length of the head main body 1 meets the design conditions; the design conditions are: the operating temperature of the sealing ring assembly 3 provided outside the head main body 1 is less than the set operating temperature, and its maximum operating temperature is a preset percentage of the set operating temperature.

[0064] The head main body 1 is installed at the end of the furnace tube, i.e., at the position of the furnace head 15. A sealing ring assembly 3 is sleeved outside it. The furnace tube is sealed by the head main body 1 and the sealing ring assembly 3 to prevent material leakage; the outer side wall of the head main body 1 is cooled through the water-cooling channel 2, thereby reducing the temperature of the sealing ring assembly 3; for the reduction of the length of the head main body 1, mainly the length of the water-cooling channel 2 is reduced. Since circulating cooling water needs to be introduced into the water-cooling channel 2, the reduction of the length of the water-cooling channel 2 can minimize the weight of the head main body 1;

[0065] In order to reduce the length of the head main body 1 and at the same time ensure the physical properties (i.e., physical strength) of the sealing ring assembly 3, the length of the head main body 1 needs to meet the design conditions to ensure that the sealing ring assembly 3 can work normally under various operating conditions of the furnace tube and ensure its service life; among them, the set operating temperature is: the temperature corresponding to keeping the physical strength of the sealing ring assembly 3 at 85%; the maximum operating temperature of the sealing ring assembly 3 is: under multiple operating conditions of the furnace tube, the maximum operating temperature of the sealing ring assembly 3, which is a preset percentage of the set operating temperature, and the preset percentage can be taken between 50% and 90%.

[0066] By restricting the length of the head main body 1 through the design conditions, it is possible to reduce the length of the head main body 1 while ensuring the physical properties of the sealing ring assembly 3 under any operating condition of the furnace tube, ensuring the sealing effect and the service life of the sealing ring assembly 3; moreover, after the length of the head main body 1 is reduced, its weight can be reduced, and the cost of manufacturing the sealing water-cooled head can be lowered; compared with the prior art, although the temperature of the sealing ring assembly 3 after cooling has increased, it does not affect its physical properties, and at the same time, the cooling energy consumption of the water-cooling channel 2 can be reduced.

[0067] As Figure 5 and Figure 6As shown, in one embodiment, the head body 1 includes: a heat-insulating inner ring 4, with a sealing outer ring 5 sleeved on its outer side. One end of the heat-insulating inner ring 4 and one end of the sealing outer ring 5 are connected by a first heat-insulating side ring 6; a water-cooling inner ring 7 is sleeved between the heat-insulating inner ring 4 and the sealing outer ring 5. One end of the water-cooling inner ring 7 is connected to the other end of the heat-insulating inner ring 4 by a second heat-insulating side ring 8. A water-cooling retaining ring 9 is provided between the other end of the water-cooling inner ring 7 and the sealing outer ring 5. A water-blocking fixing ring 10 is provided on the outer side of the other end of the sealing outer ring 5. An installation flange 11 is provided on the outer side of one end of the water-cooling inner ring 7.

[0068] Further, an annular water-cooling channel 2 is formed among the water-cooling inner ring 7, the sealing outer ring 5 and the water-cooling retaining ring 9.

[0069] As Figure 5 shown, further, heat-insulating fillers 12 are provided between the water-cooling inner ring 7 and the heat-insulating inner ring 4 and between the sealing outer ring 5 and the heat-insulating inner ring 4.

[0070] When installing the head body 1, the first heat-insulating side ring 6 is in contact sealing with the burner head 15. The sealing ring assembly 3 is fixed by a mounting member fixed on the burner head 15 and sleeved on the outer side of the sealing outer ring 5. When the furnace tube is not operating and at room temperature, the sealing ring assembly 3 does not coincide axially with the water-cooling channel 2.

[0071] When the furnace tube is operating, circulating cooling water is introduced into the water-cooling channel 2 to cool the head body 1. The heat-insulating fillers 12 can be made of heat-insulating cotton. For the part where the sealing outer ring 5 does not coincide axially with the water-cooling channel 2, heat insulation is mainly achieved through the heat-insulating cotton, reducing the heat transfer from the inside of the head body 1 to the sealing outer ring 5, and thus reducing the heat transferred to the sealing ring assembly 3; in addition, during actual operation, a cooling atmosphere is introduced to the outer side of one end of the head body 1 close to the first heat-insulating side ring 6, which can also cool the sealing outer ring 5 and reduce the heat transferred to the sealing ring assembly 3. Moreover, the first heat-insulating side ring 6 is made of stainless steel plate, and its heat can be transferred to the water-cooling channel 2, also achieving the purpose of cooling.

[0072] Therefore, when the furnace tube is operating, the furnace tube will expand, causing the sealing ring assembly 3 to move axially. When the sealing ring assembly 3 does not completely coincide axially with the water-cooling channel 2, the working temperature of the sealing ring assembly 3 can be made less than the set working temperature by the above-described method of reducing heat transfer of the outer sealing ring 5. When the furnace tube expansion causes the sealing ring assembly 3 to completely coincide axially with the water-cooling channel 2, the sealing ring assembly 3 is mainly cooled by the water-cooling channel 2. Since the higher the operating temperature of the furnace tube, the greater its expansion, the greater the moving distance of the sealing ring assembly 3. Therefore, when the operating temperature of the furnace tube is higher, the length of the axial coincidence between the sealing ring assembly 3 and the water-cooling channel 2 is longer, and the cooling effect is better. When the operating temperature of the furnace tube is lower, the length of the axial coincidence between the sealing ring assembly 3 and the water-cooling channel 2 is shorter, or even no coincidence occurs. At this time, mainly through heat insulation and the indirect cooling of the water-cooling channel 2, the heat transfer to the sealing ring assembly 3 is reduced, so that the working temperature of the sealing ring assembly 3 can always be less than the set working temperature under any operating conditions of the furnace tube, ensuring the physical properties of the sealing ring assembly 3.

[0073] Further, the set working temperature is 100 degrees Celsius.

[0074] Since the material of the sealing ring assembly 3 is usually selected as silicone rubber, when it works at 100 degrees Celsius, its physical strength can still reach about 85%. Therefore, when designing the reduction of the length of the head body 1, the working temperature of the sealing ring assembly 3 being lower than 100 degrees Celsius can ensure its physical properties and thus ensure the sealing performance.

[0075] In one embodiment, the distance between the sealing ring assembly 3 and the water-blocking fixing ring 10 is a first set distance;

[0076] The condition satisfied by the first set distance is that when the water-cooling channel 2 does not coincide axially with the first sealing ring 13, the highest working temperature reached by the sealing ring assembly 3 is a preset percentage of the set working temperature; wherein, the preset percentage is preferably 65%;

[0077] Among them, the sealing ring assembly 3 includes: a first sealing ring 13 and a second sealing ring 14, and the second sealing ring 14 is arranged axially close to the water-cooling channel 2.

[0078] The first sealing ring 13 is a foamed sealing ring, and the second sealing ring 14 is an L-shaped sealing ring, and a plurality of L-shaped sealing rings are arranged axially.

[0079] During the operation of the furnace tube, it will expand, causing the seal ring assembly 3 to move. The higher the operating temperature of the furnace tube, the closer the first seal ring 13 is to the water-cooling channel 2. Therefore, the first set distance can be set according to the expansion distance of the furnace tube in the axial direction. Moreover, at different operating temperatures of the furnace tube, the working temperatures of the seal ring assembly 3 are different. Before the seal ring assembly 3 coincides with the first seal ring 13 in the axial direction, its highest working temperature can be reached. By setting the highest working temperature as a preset percentage of the set working temperature, the axial length of the water-cooling channel 2 can be minimized as much as possible, thereby achieving the purpose of reducing the length and weight of the head body 1.

[0080] In one embodiment, the distance between the first heat-insulating side ring 6 and the water-cooling retaining ring 9 is a second set distance;

[0081] The condition satisfied by the second set distance is that when the furnace tube on which the head body 1 is installed is at any operating temperature, it will not affect the cooling effect of the water-cooling channel 2 on the seal ring assembly 3, so that the working temperature of the seal ring assembly 3 is always less than the set working temperature.

[0082] Since during the operation of the furnace tube, the furnace head 15 will transfer heat to the head body 1 and thus to the water-cooling channel 2. If the second set distance is too small, the speed of heat transfer to the water-cooling channel 2 will be faster, which will undoubtedly increase the cooling energy consumption; if the second set distance is too large, the cooling effect of the water-cooling channel 2 on the outer seal ring 5 that is not in direct contact with it for cooling will be poor, which will affect the cooling effect of the seal ring assembly 3 when it does not coincide with the water-cooling channel 2 in the axial direction. Therefore, an appropriate second set distance needs to be selected so that at any operating temperature of the furnace tube, the working temperature of the seal ring assembly 3 can always be less than the set working temperature and will not affect the cooling effect of the water-cooling channel 2 on the seal ring assembly 3.

[0083] In one embodiment, the axial length of the water-cooling channel 2 is a third set distance;

[0084] The condition satisfied by the third set distance is that when the water-cooling channel 2 does not coincide with the first seal ring 13 in the axial direction, the highest working temperature reached by the seal ring assembly 3 is a preset percentage of the set working temperature.

[0085] In the design process of reducing the length and weight of the sealed water-cooled head, mainly the axial length of the water-cooling channel 2 is reduced. The design of the third set distance enables the sealing ring assembly 3 to be completely non-coaxial with the water-cooling channel 2 axially when the furnace tube is not operating. As the operating temperature of the furnace tube rises and the sealing ring assembly 3 moves (towards the water-cooling channel 2 until complete coincidence), the better the cooling effect of the water-cooling channel 2 on the sealing ring assembly 3. Therefore, in the stage when the sealing ring assembly 3 reaches the highest working temperature and before the first sealing ring 13 coincides with the water-cooling channel 2, only by making the highest working temperature reached by the sealing ring assembly 3 be a preset percentage of the set working temperature in this stage can the length of the water-cooling channel 2 be minimized as much as possible while ensuring the physical properties of the sealing ring assembly 3.

[0086] As Figure 7 shown, the present invention also discloses an optimized design method for the rotary kiln sealed water-cooled head, which is applied to the rotary kiln sealed water-cooled head described in the present invention and includes:

[0087] Establish an initial three-dimensional model of the head body 1 and the sealing ring assembly 3 assembled;

[0088] Optimize the initial three-dimensional model and conduct simulation analysis on the optimized three-dimensional model under multiple different operating conditions to obtain the optimized simulation analysis results; among them, the operating conditions include: the operating temperature of the furnace tube on which the head body 1 is installed; the optimized simulation analysis results include: the highest working temperature of the sealing ring assembly 3 under multiple different operating conditions;

[0089] Judge whether the highest working temperature of the sealing ring assembly 3 reaches a preset percentage of the set working temperature;

[0090] If not, continue to optimize and conduct simulation analysis on the optimized three-dimensional model until the highest working temperature of the sealing ring assembly 3 in the simulation analysis results reaches a preset percentage of the set working temperature;

[0091] If so, the minimum length of the corresponding head body 1 is the final optimization result.

[0092] The initial three-dimensional model can select the structural dimensions of the head body 1 in the prior art and optimize it, that is, optimize the axial length of the water-cooling channel 2 and the distance between the first heat-insulating side ring 6 and the water-cooling retaining ring 9. The purpose is to reduce the length of the head body 1 in the initial three-dimensional model. Then, conduct simulation analysis on the optimized initial three-dimensional model, that is, simulate and analyze the temperature changes and distributions of the head body 1 and the sealing ring assembly 3 under multiple operating conditions, and the highest working temperature of the sealing ring assembly 3 can be obtained. Then, judge its highest working temperature to determine whether further optimization is needed, so as to obtain the final optimization result of the head body 1.

[0093] Further, when performing optimization and simulation analysis, the optimization design variables, optimization constraint conditions, and optimization objectives are as follows:

[0094] The optimization design variables include: the distance between the first heat insulation side ring 6 and the water-cooled retaining ring 9, and the axial length of the water-cooled channel 2;

[0095] The optimization constraint conditions include: when the water-cooled channel 2 does not coincide with the first sealing ring 13, the highest working temperature reached by the sealing ring assembly 3 is a preset percentage of the set working temperature, and, under any operating condition, the working temperature of the sealing ring assembly 3 is always less than the set working temperature;

[0096] The optimization objectives include: minimizing the length of the head body 1.

[0097] By setting the optimization design variables, optimization constraint conditions, and optimization objectives, it is possible to continuously optimize the distance between the first heat insulation side ring 6 and the water-cooled retaining ring 9, and the axial length of the water-cooled channel 2, so as to obtain the minimum length of the head body 1 that meets the optimization constraint conditions, so that when the furnace tube is operating, the head body 1 can effectively cool down the sealing ring assembly 3, and at the same time ensure the sealing effect, achieving the purpose of reducing the length and weight of the head body 1 and saving manufacturing costs.

[0098] The following is a simulation analysis of the water-cooled head in the prior art and the water-cooled head after the optimization design of the present invention. By controlling variables for simulation, the water-cooling effect can be obtained by comparing the simulation data of the two; Fixed variables: The water-cooled heads in the prior art and the optimized water-cooled heads use the same material and specifications; Variables: The water-cooled heads in the prior art and the optimized water-cooled heads are both simulated at different operating temperatures. Since their lengths are different, the temperature at the corresponding position of the head body 1 during simulation is also a variable for simulation, that is, as shown in the following table:

[0099]

[0100] Among them, the convection coefficient W / ( ) is watts per (square meter degree).

[0101] The simulation data of the water-cooled head in the prior art is as shown in the following table (simulation parameters: diameter is 1650 mm, refractory thickness is 125 mm - 40 mm):

[0102]

[0103] The corresponding simulation analysis results in the above table are as Figures 8 - 16 shown. In the figure, position 1 represents the highest temperature of the foaming sealing ring, and position 2 represents the temperature at the end of the sealing surface of the water-cooled head; In the figure, Temp represents temperature and Celsius represents degrees Celsius.

[0104] The simulation data of the water-cooled head after the optimized design of the present invention are shown in the following table (simulation parameters: diameter is 1650 mm, refractory thickness is 125 mm - 40 mm):

[0105]

[0106] The corresponding simulation analysis results in the above table are as Figures 17 - 25 shown. In the figure, position 1 represents the highest temperature of the L-shaped sealing ring, position 2 represents the highest temperature of the foaming sealing ring, and position 3 represents the temperature at the end of the sealing surface of the water-cooled head; in the figure, Temp represents temperature and Celsius represents degrees Celsius.

[0107] Through the simulation analysis of the water-cooled head in the prior art and the water-cooled head after the optimized design of the present invention, the following comparison table is obtained:

[0108]

[0109] For the water-cooled head after the optimized design of the present invention, when the temperature is lower than 800 °C, since the length of the water-cooling channel 2 only accounts for a part of the total length of the head body 1, when the contact surface between the sealing ring assembly 3 and the head body 1 has not axially coincided with the water-cooling channel 2, it will cause the temperature in this area to be relatively high. However, as the temperature gradually rises, the furnace tube expands due to the thermal expansion effect, and the sealing ring assembly 3 finally fits tightly with the water-cooling channel 2, which means that under the high-temperature operating state, the sealing ring assembly 3 can continuously be protected by the lowest temperature at the water-cooling channel 2.

[0110] In the lower operating temperature range, although the sealing ring assembly 3 is not directly in contact with the water-cooling channel 2, the heat insulation cotton configured inside the head body 1 effectively isolates the heat transfer of the furnace tube to the outer surface of the head body 1, significantly reducing the external temperature; in addition, the low-temperature nitrogen gas injected into the sealing structure (the sealing structure where the sealing ring assembly 3 is located) not only enhances the protection effect but also can further reduce the temperature of the sealing surface of the water-cooled head; particularly crucial is that the stainless steel plate used for the sealing surface of the water-cooled head, with its good heat conduction performance, quickly conducts the heat at the non-directly water-cooled end to the water-cooled section (water-cooling channel 2), realizing the effective dissipation of heat, thereby ensuring that the working area of the sealing ring assembly 3 always maintains a lower temperature state, that is, lower than the set working temperature, guaranteeing the stable operation and sealing performance of the equipment.

[0111] In the simulation analysis of the optimized water-cooled head, the maximum temperature of its foaming sealing ring reached 65 °C, which is 25 °C higher than that of the water-cooled head in the prior art. However, this temperature is still far below the maximum temperature threshold that the silicone rubber sealing ring can withstand, ensuring that even at a relatively high operating temperature, the sealing ring assembly 3 can still maintain excellent physical properties. Since the silicone rubber sealing ring can still retain up to 85% of its physical strength at 100 °C, the optimized water-cooled head still exhibits good stability and reliability even when the temperature increases slightly.

[0112] Considering that the operating temperature of the rotary kiln equipment is up to about 1000 °C during actual operation, the temperature of the sealing ring assembly 3 of the optimized water-cooled head can be stabilized below 40 °C at this time, which hardly has any adverse effect on the performance of the sealing ring assembly 3, ensuring the continuous stability of the performance. More significantly, the optimized water-cooled head has achieved a 40% weight reduction in design, not only maintaining the stability of the sealing performance but also significantly reducing the production cost, providing strong support for the lightweight and cost-effectiveness of the rotary kiln.

[0113] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0114] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0115] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the present invention, the present invention is not limited to the specific details and the examples shown and described herein.

Claims

1. A rotary kiln sealed water-cooled head, characterized in that: include: A head body (1) is provided with a water cooling channel (2) for cooling the outer side surface of the head body (1), and the length of the head body (1) meets the design conditions so that the length of the head body (1) is minimized; the design conditions are: the working temperature of the sealing ring assembly (3) arranged on the outer side of the head body (1) is lower than the set working temperature, and the maximum working temperature thereof is a preset percentage of the set working temperature; The head body (1) comprises: a heat-insulating inner ring (4), an outer side of which is sleeved with a sealing outer ring (5), one end of the heat-insulating inner ring (4) and one end of the sealing outer ring (5) are connected via a first heat-insulating side ring (6); a water-cooling inner ring (7) is sleeved between the heat-insulating inner ring (4) and the sealing outer ring (5), one end of the water-cooling inner ring (7) and the other end of the heat-insulating inner ring (4) are connected via a second heat-insulating side ring (8), a water-cooling retaining ring (9) is provided between the other end of the water-cooling inner ring (7) and the sealing outer ring (5), a water retaining fixing ring (10) is provided on the outer side of the other end of the sealing outer ring (5), and a mounting flange (11) is provided on the outer side of one end of the water-cooling inner ring (7); An annular water cooling channel (2) is formed between the water cooling inner ring (7), the sealing outer ring (5) and the water cooling baffle ring (9); The distance between the sealing ring assembly (3) and the water retaining fixing ring (10) is a first set distance; The condition satisfied by the first set distance is that: when the water cooling channel (2) does not overlap with the first sealing ring (13) in the axial direction, the maximum operating temperature reached by the sealing ring assembly (3) is a preset percentage of the set operating temperature; The sealing ring assembly (3) comprises: a first sealing ring (13) and a second sealing ring (14), wherein the second sealing ring (14) is arranged close to the water cooling channel (2) in the axial direction; The distance between the first heat-insulating side ring (6) and the water-cooling baffle ring (9) is a second set distance; The second set distance satisfies the condition that: when the furnace tube on which the end cap body (1) is installed is at any operating temperature, it will not affect the cooling effect of the water cooling channel (2) on the sealing ring assembly (3), so that the operating temperature of the sealing ring assembly (3) is always lower than the set operating temperature; The axial length of the water cooling channel (2) is a third set distance; The condition satisfied by the third set distance is that when the water cooling channel (2) does not overlap with the first sealing ring (13) in the axial direction, the maximum operating temperature reached by the sealing ring assembly (3) is a preset percentage of the set operating temperature.

2. The rotary kiln sealing water-cooling head according to claim 1, characterized in that: A heat-insulating filler (12) is provided between the water-cooled inner ring (7) and the heat-insulating inner ring (4), and between the sealing outer ring (5) and the heat-insulating inner ring (4).

3. The rotary kiln sealing water-cooling head according to claim 1, characterized in that: The set working temperature is 100 degrees Celsius.

4. An optimization design method for a rotary kiln sealing water-cooling head, applied to the rotary kiln sealing water-cooling head according to any one of claims 1 to 3, characterized in that: include: Establishing an initial three-dimensional model of the assembly of the head body (1) and the sealing ring assembly (3); The initial three-dimensional model is optimized, and simulation analysis is performed on the optimized three-dimensional model under multiple different operating conditions to obtain optimized simulation analysis results; wherein the operating conditions include: the operating temperature of the furnace tube on which the head body (1) is installed; the optimized simulation analysis results include: the maximum operating temperature of the sealing ring assembly (3) under multiple different operating conditions; Determining whether the maximum operating temperature of the sealing ring assembly (3) reaches a preset percentage of the set operating temperature; If not, the optimized three-dimensional model is continuously optimized and simulated until the maximum operating temperature of the sealing ring assembly (3) in the simulation analysis result reaches a preset percentage of the set operating temperature; If so, the corresponding minimum length of the head body (1) is the final optimization result.

5. The optimization design method for the rotary kiln sealing water cooling head according to claim 4 is characterized in that: When performing optimization and simulation analysis, the optimization design variables, optimization constraints, and optimization objectives are as follows: The optimized design variables include: the distance between the first heat-insulating side ring (6) and the water-cooling baffle ring (9), and the axial length of the water-cooling channel (2); The optimization constraint conditions include: when the water cooling channel (2) does not overlap with the first sealing ring (13), the maximum operating temperature reached by the sealing ring assembly (3) is a preset percentage of the set operating temperature, and under any operating condition, the operating temperature of the sealing ring assembly (3) is always lower than the set operating temperature; The optimization objectives include: the length of the head body (1) is minimized.

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