A dynamic sealing structure and rotary kiln equipment

Abstract

The present invention provides a dynamic sealing structure and a rotary kiln equipment, belonging to the field of sealing technology. The dynamic sealing structure includes a kiln tail, a material discharge hood, a sealing mechanism, a guiding mechanism and a balancing device. The material discharge hood includes a material discharge hood cylinder and a material discharge hood end face connected thereto, the material discharge hood cylinder is sleeved on the outer side of the circumferential wall of the kiln tail, and the material discharge hood end face is spaced apart from the end face of the kiln tail. The sealing mechanism is arranged between the material discharge hood cylinder and the kiln tail and is connected to the inner wall of the material discharge hood cylinder. The guiding mechanism is arranged between the inner wall of the material discharge hood cylinder and the outer side of the kiln tail and is located on one side or both sides of the sealing mechanism along the axial direction of the rotary kiln, and there is a rotation gap between the guiding mechanism and the kiln tail, and the balancing device is connected to the outer side of the material discharge hood cylinder. The dynamic sealing structure has a good overall sealing effect, is suitable for coal or oil shale or biomass pyrolysis rotary kiln, and can improve the problem of poor sealing due to the vibration of the rotary kiln. The above rotary kiln equipment has strong practicality and broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing, and particularly relates to a dynamic sealing structure and rotary kiln equipment. Background Art

[0002] The most widely used seal for rotary kilns is fish scale seal, which is sufficient for relatively safe sealing in kiln environments such as lime kilns. However, for pyrolysis coal, the gas is both toxic and has major safety issues, which requires strict sealing. Not only does the material hood need to be strictly sealed with the rotary kiln, but the material port on the material hood and the receiving bin port must be absolutely sealed, and the gas outlet on the material hood and the gas pipeline port must be strictly sealed.

[0003] The axis of a rotary kiln cannot be a straight line, and its rotation is accompanied by vibration. How to ensure the sealing between the material discharge hood and the rotary kiln, as well as the sealing between the material discharge port on the material discharge hood and the receiving silo port, and the sealing between the gas outlet on the material discharge hood and the gas pipeline port when the rotary kiln vibrates has become the focus of research.

[0004] When a rotary kiln is started up, the straightness of its axis is often the worst, and the kiln's vibration is also the largest. However, as the rotary kiln runs for a long time, the straightness will tend to be a straight line, and the vibration of the rotary kiln will become smaller and smaller. However, due to the large difference in local temperature of the kiln body, the straightness of the rotary kiln is always in a poor state, and the vibration of the rotary kiln is always large. Large vibration is extremely unfavorable for sealing, and larger sealing compensation is required. Unlike ordinary seals, ordinary seals usually do not require larger sealing compensation for vibration problems, while rotary kilns for pyrolysis coal or biomass require sealing compensation for larger vibrations. Summary of the invention

[0005] One of the purposes of the present invention is to provide a dynamic sealing structure with good overall sealing effect, which is suitable for coal, oil shale or biomass pyrolysis rotary kiln and can improve the problem of poor sealing due to rotary kiln jumping in the prior art.

[0006] Another object of the present invention is to provide a rotary kiln device, which has strong practicality and broad application prospects.

[0007] The present invention solves the technical problem by adopting the following technical solutions:

[0008] The embodiment of the present invention provides a dynamic sealing structure, which includes a kiln tail, a material discharge hood, a sealing mechanism, a guiding mechanism and a balancing device.

[0009] The material lowering cover comprises a material lowering cover cylinder and a material lowering cover end face connected to the material lowering cover cylinder. The material lowering cover cylinder is sleeved on the outer side of the circumferential wall of the kiln tail, and the material lowering cover end face is spaced apart from the end face of the kiln tail.

[0010] The sealing mechanism is arranged between the material lowering cover cylinder and the kiln tail and is connected with the inner wall of the material lowering cover cylinder.

[0011] The guide mechanism is arranged between the inner wall of the material discharge cover cylinder and the outer side of the kiln tail and is located on one side or both sides of the sealing mechanism along the axis direction of the rotary kiln. There is a rotation gap between the guide mechanism and the kiln tail to make the sealing mechanism coaxial with the kiln tail.

[0012] The balancing device is connected to the outer side of the lower material cover cylinder and is used to control the lower material cover to apply a force not greater than 10% of the gravity of the lower material cover to the kiln tail in any direction.

[0013] Optionally, the distance between the end surface of the lower material cover and the end surface of the kiln tail in the axial direction of the kiln tail is 0.3-2.0m.

[0014] Optionally, the guide mechanism is located on both sides of the sealing mechanism along the axial direction of the rotary kiln.

[0015] Optionally, the rotation gap is greater than the sum of the cylindricity error of the kiln tail and the cylindricity error of the discharge cover cylinder.

[0016] Furthermore, the sealing mechanism includes at least one rubber sealing ring.

[0017] Optionally, when the number of rubber sealing rings is greater than 1, a plurality of rubber sealing rings are arranged at intervals along the axial direction of the kiln tail.

[0018] Optionally, the sealing mechanism is a herringbone rubber sealing ring having two sealing lips.

[0019] Optionally, the concession or compensation of the sealing lip is within 6 mm.

[0020] Furthermore, the dynamic sealing structure also includes a sealing smooth sliding belt arranged on the outside of the kiln tail, a first ring plate is connected between the smooth sliding belt and the end face of the kiln tail, a second ring plate is connected to the end of the end face of the smooth sliding belt away from the kiln tail, a first gap is provided between the second ring plate and the outer wall of the kiln tail, and a plurality of adjustment parts for adjusting the size of the first gap are provided along the circumferential direction between the second ring plate and the outer wall of the kiln tail.

[0021] Optionally, the outer wall of the kiln tail between the first ring plate and the second ring plate is provided with multi-head spiral blades or inclined plates forming an angle with the axis of the kiln tail.

[0022] Optionally, a second gap is provided between the multi-start spiral blades and the inner side wall of the smooth sliding belt or between the inclined plate and the inner side wall of the smooth sliding belt.

[0023] Optionally, a cooling nozzle is provided on the outer side of the end surface of the adjusting member away from the kiln tail.

[0024] Furthermore, the sealing mechanism and the guiding mechanism are arranged between the material discharge cover cylinder and the smooth sliding belt, and the sealing lip edge of the "human" rubber sealing ring contacts and seals with the smooth sliding belt.

[0025] Optionally, when the number of the "human" rubber sealing rings is greater than 1, a first spacer ring is provided between two adjacent "human" rubber sealing rings, and a second spacer ring is provided on the outer side of the outermost "human" rubber sealing ring.

[0026] Optionally, the guide mechanism is composed of two guide slip rings, which are respectively arranged on the outside of the second spacer ring, and a third gap is arranged between the guide slip rings and the smooth sliding belt.

[0027] Optionally, a fixing piece is provided on the outer side of the guide slip ring, and the fixing piece includes a step on the inner wall of the fixing slip ring or the lower material cover cylinder.

[0028] Optionally, the guide slip ring is a wear-resistant copper slip ring.

[0029] Optionally, the herringbone rubber sealing ring is provided with a first oil hole for filling lubricating oil.

[0030] Optionally, the guide slip ring is provided with a second oil hole for filling with lubricating oil.

[0031] Furthermore, the dynamic sealing structure also includes a discharge system, which is arranged below the cylinder of the discharge hood. The discharge system includes a discharge port, a discharge port sealing mechanism and a receiving material bin port. The discharge port is located between the end face of the kiln tail and the end face of the discharge hood. One end of the discharge port is connected to the bottom of the cylinder of the discharge hood, and the other end is connected to the receiving material bin port through the discharge port sealing mechanism; the discharge port sealing mechanism is filled with liquid low-temperature alloy.

[0032] Optionally, the low-temperature alloy filled in the sealing mechanism of the feed port includes lead, tin and bismuth; preferably, the low-temperature alloy filled in the sealing mechanism of the feed port consists of lead, tin and bismuth.

[0033] Furthermore, the dynamic sealing structure also includes a gas outlet system, which includes a gas outlet, a gas outlet sealing mechanism and a gas pipeline opening. The gas outlet is arranged on the lower material hood, one end of the gas outlet is connected to the lower material hood, and the other end is connected to the gas pipeline opening through the gas outlet sealing mechanism. The gas outlet sealing mechanism is filled with liquid low-temperature alloy.

[0034] Optionally, the gas outlet is arranged at the top of the cylinder of the lower material cover and is connected with the lower material cover.

[0035] Optionally, the gas outlet is arranged on the end surface of the lower material hood and is connected with the lower material hood.

[0036] Optionally, the gas outlet is arranged on one side or both sides of the cylinder of the lower material cover and is connected with the lower material cover.

[0037] Optionally, the gas outlet system and the material discharging system share a material discharging system.

[0038] Optionally, the low-temperature alloy filled in the gas outlet sealing mechanism includes lead, tin and bismuth; preferably, the low-temperature alloy filled in the gas outlet sealing mechanism consists of lead, tin and bismuth.

[0039] Furthermore, the balancing device includes a lifting lug connected to the outer wall of the lower material cover cylinder, a plurality of lifting lugs are arranged at intervals, the positions of the plurality of lifting lugs are all located outside the center of gravity of the lower material cover and all the lifting lugs are not on the same side of the center of gravity of the lower material cover.

[0040] Furthermore, each lifting eye is connected to a steel cable with adjustable length, and the other ends of all the steel cables away from the lifting eyes are connected to a steel ring.

[0041] Optionally, a first tensioner pointing upwards is connected above the steel ring.

[0042] Optionally, the first tensioner is a pulley mechanism or a constant force spring hanger.

[0043] Optionally, the balancing device further comprises a frame arranged on both sides and above the lower material cover, and the frame is used to withstand the tension generated by the first tensioner.

[0044] Furthermore, the balancing device also includes at least one pair of second horizontal tensioners arranged between the two sides of the cylinder of the lower material cover and the frame, and the tension of each pair of second horizontal tensioners in the horizontal direction is equal in magnitude and opposite in direction.

[0045] Optionally, the second horizontal tensioner is a pulley mechanism or a constant force spring hanger.

[0046] Optionally, the value of the tension of the second horizontal tensioner is not greater than 5% of the gravity of the lower material hood.

[0047] The embodiment of the present invention further provides a rotary kiln device, which includes the above-mentioned dynamic sealing structure.

[0048] The beneficial effects of the dynamic sealing structure and rotary kiln equipment in this application include:

[0049] The dynamic sealing structure provided in the present application realizes that the axis of the material lowering hood coincides with the axis of the rotary kiln, or the deviation is within a small range, by setting a guide mechanism, so that the eccentricity between the sealing ring and the kiln tail is small in the entire circumferential direction, the sealing compensation is uniform, the bias pressure is prevented, and the service life of the sealing ring is extended. In addition, a sealing structure is set between the cylinder of the material lowering hood and the kiln tail, so that the overall sealing effect of the dynamic sealing structure is good, and by setting a balancing device, the friction of the guide mechanism can be reduced, making the guide mechanism and the sealing mechanism more durable. The above-mentioned dynamic sealing structure is suitable for coal or oil shale or biomass pyrolysis rotary kiln, and can improve the problem of poor sealing due to the vibration of the rotary kiln in the prior art. The rotary kiln equipment including the above-mentioned dynamic sealing structure is highly practical and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 A schematic structural diagram of a dynamic sealing structure provided in Example 1 of the present application;

[0052] Figure 2 A left side view of the dynamic sealing structure provided in Example 1;

[0053] Figure 3 A schematic structural diagram of a dynamic sealing structure provided in Example 2 of the present application;

[0054] Figure 4 A left side view of the dynamic sealing structure provided in Example 2;

[0055] Figure 5 A schematic structural diagram of a dynamic sealing structure provided in Example 3 of the present application;

[0056] Figure 6 This is a schematic structural diagram of the dynamic sealing structure provided in Example 4 of the present application.

[0057] Icons: 1-kiln tail; 11-smooth sliding belt; 12-first ring plate; 13-multi-head spiral blades; 14-adjusting part; 15-second ring plate; 16-cooling nozzle; 2-feeding hood; 21-feeding hood cylinder; 22-feeding hood end face; 3-discharging system; 31-feeding port; 32-feeding port sealing mechanism; 33-receiving silo port; 4-sealing mechanism; 41-"human" rubber sealing ring; 4101-sealing lip; 42-first spacer ring; 43-first oil hole; 44-second spacer ring; 5-guide mechanism; 51-guide sliding ring; 52-second oil hole; 53-fixed sliding ring; 6-balancing device; 61-steel cable; 62-steel ring; 63-first tensioner; 64-frame; 65-second tensioner; 7-gas outlet system; 71-gas outlet; 72-gas outlet sealing mechanism; 73-gas pipeline port. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0061] In addition, the term "vertical" does not mean that the component is required to be absolutely vertical, but can be slightly tilted. For example, "vertical" only means that its direction is more vertical than "horizontal", which does not mean that the structure must be completely vertical, but can be slightly tilted.

[0062] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The specific description is given below.

[0064] The present application proposes a dynamic sealing structure, which includes a kiln tail, a material discharge hood, a sealing mechanism, a guiding mechanism and a balancing device.

[0065] The material lowering cover comprises a material lowering cover cylinder and a material lowering cover end face connected to the material lowering cover cylinder. The material lowering cover cylinder is sleeved on the outer side of the circumferential wall of the kiln tail. The material lowering cover end face and the end face of the kiln tail are spaced apart in the axial direction of the kiln tail. For example, the spacing may be 0.3-2.0m, specifically 0.3m, 0.5m, 1m, 1.5m or 2m, etc. The size of the above spacing distance is related to the diameter size and the size of the discharge amount of the rotary kiln. The larger the diameter of the rotary kiln and the larger the discharge amount, the larger the distance; conversely, the smaller the distance.

[0066] The sealing mechanism is arranged between the material lowering cover cylinder and the kiln tail and is connected with the inner wall of the material lowering cover cylinder.

[0067] Optionally, the sealing mechanism may include at least one rubber sealing ring. When the number of rubber sealing rings is greater than 1, the plurality of rubber sealing rings are spaced apart along the axial direction of the kiln tail. In some embodiments, the sealing mechanism is a "human" rubber sealing ring having two sealing lips. Preferably, the yielding or compensating property of the sealing lips can reach within 6 mm. The two lips of the "human" rubber sealing ring are sealing parts with relatively large yielding properties, which can play a role in compensating the sealing gap.

[0068] The guide mechanism is arranged between the inner wall of the material discharge cover cylinder and the outer side of the kiln tail and is located on one side or both sides of the sealing mechanism along the axis direction of the rotary kiln, preferably on both sides of the sealing mechanism, which is more conducive to the stability of the seal. There is a rotation gap between the guide mechanism and the kiln tail so that the sealing mechanism and the kiln tail are coaxial.

[0069] Preferably, the rotation gap is larger than the sum of the cylindrical error of the kiln tail and the cylindrical error of the material cover, so that the guide mechanism and the kiln tail can rotate relative to each other without getting stuck. The guide mechanism is not only used to control the relatively uniform gap between the material cover and the kiln tail over the entire circumference, but also used to control the coaxiality of the center of the sealing mechanism and the kiln tail.

[0070] Furthermore, the dynamic sealing structure also includes a sealed smooth sliding belt arranged on the outer side of the kiln tail to reduce the friction coefficient with the wear-resistant copper sliding ring and the rubber seal. A first ring plate is connected between the smooth sliding belt and the end face of the kiln tail, and the first ring plate, the sealed smooth sliding belt and the kiln tail are welded and sealed.

[0071] One end of the end surface of the smooth sliding belt away from the kiln tail is connected to a second ring plate, a first gap is provided between the second ring plate and the outer wall of the kiln tail, and a plurality of adjusting members for adjusting the size of the first gap are provided between the second ring plate and the outer wall of the kiln tail along the circumferential direction. The second ring plate can be provided so that the back of the smooth sliding belt can maintain the effect of proper cooling water cooling at the lowest end. Optionally, the adjusting member can be an adjusting block or an adjusting bolt, the purpose of which includes adjusting the coaxiality of the smooth sliding belt and the kiln tail. The number of adjusting blocks or adjusting bolts is limited, and there is more space between every two adjusting blocks or adjusting bolts.

[0072] It is worth noting that in the present application, the first ring plate and the second ring plate are arranged as an insulation layer rather than a closed cavity. Through the above arrangement, the temperature of the smooth sliding belt can be relatively low, and both the rubber sealing material and the lubricating oil can better play their role and performance.

[0073] Further, the outer wall of the kiln tail between the first ring plate and the second ring plate is provided with a multi-head spiral blade or an inclined plate that forms an angle with the axis of the kiln tail. For reference, the multi-head spiral blade is welded to the outer wall of the kiln tail, or the inclined plate is welded to the outer wall of the kiln tail. The multi-head spiral blade forms an angle of 5-30°, such as 15°, with the axis of the kiln tail. Similarly, the inclined plate can also form an angle of 5-10°, such as 6°, with the axis of the kiln tail.

[0074] A second gap is provided between the multi-head spiral blades and the inner side wall of the smooth sliding belt or between the inclined plate and the inner side wall of the smooth sliding belt.

[0075] A cooling nozzle is provided on the outer side of the end surface of the adjusting member away from the kiln tail. Cooling water or cooling air can be passed through the cooling nozzle to achieve a better cooling effect of the heat insulation layer. The function of the multi-head spiral blade or inclined plate includes pushing the water or cooling air sprayed from the cooling nozzle to the first ring plate during the rotation of the rotary kiln to make the cooling flow more uniform.

[0076] The purpose of setting the angle of the multi-head spiral blades or inclined plates is that during the rotation of the kiln, the coolant entering from the first gap can smoothly enter the second gap along the multi-head spiral blades or inclined plates, thereby playing a role in cooling and heat insulation.

[0077] Furthermore, the sealing mechanism and the guiding mechanism are both arranged between the material discharging cover cylinder and the smooth sliding belt, and the sealing lip of the "human" rubber sealing ring contacts and seals with the smooth sliding belt, so that when there is a large deviation (such as 5mm) between the axis of the material discharging cover cylinder and the axis of the smooth sliding belt, the sealing performance can still be compensated and ensured. When the number of "human" rubber sealing rings is greater than 1, a first spacer ring (middle spacer ring) is arranged between two adjacent "human" rubber sealing rings, and a second spacer ring is arranged on the outer side of the outermost "human" rubber sealing ring along the axis direction of the rotary kiln.

[0078] The guide mechanism is composed of two guide slip rings, which are respectively arranged on the outside of the second spacer ring. A third gap (rotation gap) is set between the guide slip ring and the smooth belt to prevent the relative rotation jamming phenomenon between the guide slip ring and the smooth belt due to the cylindrical error. For example, the cylindrical error of the kiln tail is 0.2mm, and the cylindrical error of the material cover cylinder is 0.3mm. The rotation gap is preferably set to 0.6-0.8mm, which can avoid the rotation jamming phenomenon between the material cover and the kiln tail, and at the same time, it will not cause too large a gap and lose the guiding function. The guiding function here is to control the coaxiality of the center of the "human" shaped rubber sealing ring of the sealing mechanism and the kiln tail, which is conducive to protecting the rubber seal and keeping it in a good sealing state.

[0079] The guide slip ring can be a wear-resistant copper slip ring. The fixed slip ring jumps with the jumping of the kiln tail, that is, it jumps with the jumping of the smooth sliding belt when it rotates. The fixed slip ring controls the "human" shaped rubber sealing ring to jump with the fixed slip ring. The setting of the guide mechanism-wear-resistant copper slip ring can prevent the sealing ring and the smooth sliding belt from biasing and wearing, so that the rubber seal can be used for a longer time.

[0080] Furthermore, a fixing piece is provided on the outer side of the guide slip ring, and the fixing piece includes a step that fixes the slip ring or the inner wall of the lower material cover cylinder.

[0081] For reference, the herringbone rubber seal ring is provided with a first oil hole for filling lubricating oil. The guide slip ring is provided with a second oil hole for filling lubricating oil. The provision of the first oil hole and the second oil hole can increase the lubricity of the corresponding structure, reduce friction, and increase service life.

[0082] Based on the above, by setting the guide mechanism, the axis of the material discharge hood can be coincident with the axis of the rotary kiln, or the deviation can be within a smaller range, so that the eccentricity between the sealing ring and the kiln tail is small in the entire circumferential direction, the sealing compensation is uniform, the bias pressure is prevented, and the service life of the sealing ring is extended.

[0083] Furthermore, the dynamic sealing structure also includes a discharge system arranged below the discharge hood cylinder, the discharge system including a discharge port, a discharge port sealing mechanism and a receiving material bin port, the discharge port is located between the end face of the kiln tail and the end face of the discharge hood, one end of the discharge port is connected to the bottom of the discharge hood cylinder, and the other end is connected to the receiving material bin port through the discharge port sealing mechanism (for example, through a flange sealing connection); the discharge port sealing mechanism is similar to a water seal structure, which is filled with liquid low-temperature alloy.

[0084] Optionally, the liquid low-temperature alloy filled in the sealing mechanism of the feed port may include lead, tin and bismuth. Preferably, the low-temperature alloy filled in the sealing mechanism of the feed port is composed of lead, tin and bismuth. The above three metals not only have low melting points and relatively large densities, but also the melting point of the alloy formed is even lower, less than 100°C, and are relatively ideal materials for liquid seals with ambient temperatures above 300°C.

[0085] It is worth mentioning that in the present application, the liquid low-temperature alloy is filled in the sealing mechanism of the discharge port because during operation, the liquid low-temperature alloy is in a liquid state and the liquid can flow. The gas temperature during operation and the ambient temperature around the sealing mechanism can ensure that the low-temperature alloy is in a liquid state. The density of the liquid low-temperature alloy is about 10 times that of water. Usually, the gas in the kiln body is under positive pressure, and the pressure difference is generally not more than 8000Pa. Then, the liquid level difference inside and outside the discharge sealing mechanism is relatively small. Generally, the liquid level difference is not more than 80mm, which is 10 times smaller than the liquid level difference when using water for sealing. The melting temperature of the liquid alloy does not exceed 100°C. Water cannot make a seal in an environment with a temperature greater than 300°C, and safety is fully assured.

[0086] A reliable seal is provided between the material discharge port provided on the material discharge cover and the material receiving bin port, thereby effectively preventing gas leakage.

[0087] Furthermore, the dynamic sealing structure also includes a gas outlet system, which includes a gas outlet, a gas outlet sealing mechanism and a gas pipeline opening. The gas outlet is arranged on the material lowering cover (specifically arranged at the top of the material lowering cover cylinder), one end of the gas outlet is connected to the material lowering cover, and the other end is connected to the gas pipeline opening through the gas outlet sealing mechanism. The gas outlet sealing mechanism is filled with liquid low-temperature alloy.

[0088] A reliable seal is arranged between the gas outlet arranged on the material discharge hood and the gas pipeline opening, thereby further effectively preventing gas leakage.

[0089] For reference, the gas outlet is arranged at the top of the cylinder of the lower material cover and is connected to the lower material cover. Alternatively, the gas outlet is arranged at the end surface of the lower material cover and is connected to the lower material cover. Alternatively, the gas outlet is arranged on one side or both sides of the cylinder of the lower material cover and is connected to the lower material cover. In the present application, the gas outlet system and the discharge system can share a discharge system.

[0090] As an alternative, the low temperature alloy filled in the gas outlet sealing mechanism may include lead, tin and bismuth. Preferably, the low temperature alloy filled in the gas outlet sealing mechanism consists of lead, tin and bismuth.

[0091] Furthermore, a balancing device is connected to the upper outer part of the lower material cover cylinder, and the balancing device is used to control the lower material cover to apply as little force as possible to the kiln tail in any direction, so as to reduce the friction and wear between the guide slip ring and the smooth sliding belt as much as possible, and at least control the force applied to the kiln tail to be no more than 10% of the weight of the lower material cover, and more preferably, control the lower material cover to apply no more than 5% of the weight of the lower material cover to the kiln tail in any direction. It is worth noting that the smaller the applied force, the more the friction of the guide mechanism can be reduced, and the more durable the guide mechanism and the sealing mechanism are.

[0092] Optionally, the balancing device includes a plurality of (such as 3 or 4, etc.) connected lifting ears arranged on the outer wall of the lower material cover cylinder, the plurality of lifting ears are arranged at intervals (that is, there is a certain distance between the lifting ears), the positions of the plurality of lifting ears are all located outside the center of gravity of the lower material cover, and all the lifting ears are not on the same side of the center of gravity of the lower material cover. If there are two lifting ears on both sides of the axis of the lower material cover, the two lifting ears are symmetrically arranged with respect to the vertical line of the center of gravity of the lower material cover. The lifting ears can be arranged on the upper part of the outer wall of the lower material cover cylinder, or on the side, or on the bottom, and can be arranged according to specific circumstances. Relatively speaking, it is relatively simple to arrange the lifting ears on the upper part, but there may be a possibility that the round shape of the lower material cover cylinder body is elongated up and down. This tendency can be reduced by strengthening the rigidity of the lifting ears; the lifting ears are arranged on the side, and from the perspective of force, the tendency to form an ellipse is relatively small; the lifting ears are arranged on the bottom, and from the perspective of force, the tendency to form an ellipse is relatively small, but the lifting is relatively complicated.

[0093] The arrangement of three or four lifting ears is conducive to the adjustment of the balance of the lower material cover, including the symmetry adjustment and axis adjustment of the lower material cover.

[0094] For reference, in order to avoid the gas outlet system, a pair of symmetrical lifting ears are set on the end face of the lower material hood cylinder close to the lower material hood, and a lifting ear is set on the top of the end face of the lower material hood cylinder away from the lower material hood. The positions of the three lifting ears are respectively located on the outside of the center of gravity of the lower material hood, and the above three lifting ears are not on one side of the center of gravity of the lower material hood.

[0095] Furthermore, each lifting eye is connected to a steel cable with adjustable length, and the other ends of all the steel cables away from the lifting eyes are connected to a steel ring.

[0096] Optionally, a first tensioner pointing upward is connected above the steel ring. When the lower material cover is suspended, the adjustable length of the steel cable is adjusted to make the axis of the lower material cover parallel to the axis of the inclined rotary kiln, and the tension of the first tensioner is equal to the gravity of the lower material cover.

[0097] When the lower material cover is suspended, three adjustable length steel cables are adjusted to make the two sides of the lower material cover symmetrical about the vertical line, and make the axis of the lower material cover parallel to the axis of the inclined rotary kiln. The tension of the first tensioner is equal to the gravity of the lower material cover.

[0098] In some embodiments, the first tensioner is a pulley mechanism or a constant force spring hanger, and correspondingly, the tension of the first tensioner is the tension of the counterweight or the constant force spring hanger arranged through the pulley mechanism.

[0099] Among them, the constant force spring hanger is designed according to the principle of moment balance. Under the permitted load displacement, its load moment and spring force remain balanced. It is suitable for pipelines and equipment with thermal displacement in industry, and can obtain constant support force, so it will not bring additional stress to pipelines and equipment. This structure is compact.

[0100] Furthermore, the balancing device also includes a frame arranged on both sides and above the lower material cover, and the frame is used to withstand the tension generated by the first tensioner.

[0101] Furthermore, the balancing device also includes at least one pair of second horizontal tensioners arranged between the two sides of the cylinder of the lower material cover and the frame, and the tension of each pair of second horizontal tensioners in the horizontal direction is equal in magnitude and opposite in direction.

[0102] Preferably, the pulling force of the second horizontal tensioner is no more than 5% of the weight of the lower material cover, so that the stability of the lower material cover can be controlled with a smaller force.

[0103] In some embodiments, the second horizontal tensioner may also be a pulley mechanism or a constant force spring hanger. Correspondingly, the tension of the second tensioner is the tension of the counterweight or the constant force spring hanger arranged by the pulley mechanism.

[0104] Based on the above, by setting a balancing device, the lower material cover is in a state of force balance, or the force applied by the lower material cover to the rotary kiln is within 5% of the gravity of the lower material cover, thereby reducing the force between the lower material cover and the tail of the rotary kiln, and then reducing the friction between the guide mechanism and the sealing mechanism and the tail of the rotary kiln, extending the service life of the guide mechanism, and correspondingly extending the service life of the sealing ring.

[0105] The dynamic sealing structure provided in the present application can simultaneously meet the sealing between the material discharge hood and the rotary kiln, the sealing between the material discharge port on the material discharge hood and the receiving material bin port, the sealing between the gas outlet on the material discharge hood and the gas pipeline port, and can also balance the force between the material discharge hood and the rotary kiln to reduce friction resistance.

[0106] In addition, the present application also provides a rotary kiln device, which includes the above-mentioned dynamic sealing structure, that is, the kiln tail, material discharge hood, sealing structure, guide structure, material discharge system, balancing device and other structures in the rotary kiln equipment are arranged with reference to the above-mentioned dynamic sealing structure.

[0107] Example 1

[0108] like Figure 1 , Figure 2 As shown, this embodiment provides a dynamic sealing structure for a coal or biomass pyrolysis rotary kiln, including a kiln tail 1, a material hood 2 and a discharging system 3. The material hood 2 is welded by a material hood cylinder 21 and a material hood end face 22.

[0109] The kiln tail 1 includes a sealed smooth sliding belt 11 arranged on the outer side of the kiln tail 1, a first ring plate 12 is arranged between the inner wall of the sealed smooth sliding belt 11 and the end face of the kiln tail 1, the first ring plate 12 is welded and sealed with the sealed smooth sliding belt 11 and the kiln tail 1, and a second ring plate 15 is arranged and connected to the other end face of the sealed smooth sliding belt 11 away from the end face of the kiln tail 1. There is a gap between the second ring plate 15 and the outer wall of the kiln tail 1, and a plurality of adjusting members 14 (adjusting blocks) are arranged on the circumferential wall between the second ring plate 15 and the outer wall of the kiln tail 1 to adjust the gap between the inner wall of the sealed smooth sliding belt 11 and the outer wall of the kiln tail 1. A multi-head spiral blade 13 is arranged between the first ring plate 12 and the second ring plate 15 and on the outer wall of the kiln tail 1, which forms an angle of 15° with the axis of the kiln tail 1, and the multi-head spiral blade 13 is welded to the outer wall of the kiln tail 1, and there is a gap between the multi-head spiral blade 13 or the inclined plate and the inner side wall of the sealed smooth sliding belt 11. A cooling nozzle 16 is arranged outside the adjusting member 14 at the end surface away from the kiln tail 1, and cooling water flows through the cooling nozzle 16.

[0110] The material lowering cover cylinder 21 is sleeved on the outer side of the circumference of the sealed smooth belt 11, and the material lowering cover end face 22 of the material lowering cover 2 is away from the end face of the kiln tail 1, and the distance between the material lowering cover end face 22 of the material lowering cover 2 and the end face of the kiln tail 1 is 1.0m. A sealing mechanism 4 and a guide mechanism 5 are arranged between the inner wall of the material lowering cover cylinder 21 and the sealed smooth belt 11, and the guide mechanism 5 is composed of two guide sliding rings 51, and the sealing mechanism 4 is composed of two "human" rubber sealing rings 41, and the "human" rubber sealing ring 41 has two sealing lips 4101 with a yield or compensation within 6mm, and the sealing lips 4101 are in contact and sealed with the smooth belt 11. A first spacer ring 42 is arranged between the two "human" rubber sealing rings 41, and a second spacer ring 44 is arranged on both sides of the two "human" rubber sealing rings 41, and a guide sliding ring 51 is arranged on the outer side of the two second spacer rings 44, and a rotation gap is arranged between the guide sliding ring 51 and the smooth belt 11.

[0111] A fixed slip ring 53 is arranged outside the guide slip ring 51 (wear-resistant copper slip ring), a first oil hole 43 filled with lubricating oil is arranged on the herringbone rubber seal ring, and a second oil hole 52 filled with lubricating oil is arranged on the guide slip ring 51.

[0112] A balancing device 6 is provided on the upper outer side of the material cover cylinder 21, which is used to control the material cover 2 to apply a force not greater than 5% of the gravity of the material cover 2 to the kiln tail 1 in any direction. The discharge system 3 is provided below the material cover cylinder 21, and the discharge system 3 includes a discharge port 31, a discharge port sealing mechanism 32, and a receiving material bin port 33. The discharge port 31 is between the guide mechanism 5 and the end face of the kiln tail 1, and one end is connected to the bottom end of the material cover cylinder 21, and the other end is connected to the receiving material bin port 33 through the discharge port sealing mechanism 32, which is a flange sealed connection; the discharge port sealing mechanism 32 is filled with three low melting point alloys of lead, tin and bismuth.

[0113] A gas outlet system 7 is also provided on the lower material cover 2, and the gas outlet system 7 includes a gas outlet 71, a gas outlet sealing mechanism 72, and a gas pipeline port 73. The gas outlet 71 is provided at the top end of the lower material cover cylinder 21 and is a straight section. The gas pipeline port 73 is above the gas outlet 71. The gas outlet sealing mechanism 72 is between the gas outlet 71 and the gas pipeline port 73. The lower end of the gas outlet 71 is welded to the top end of the lower material cover cylinder 21. The upper end of the gas outlet 71 is connected to the lower end of the gas outlet sealing mechanism 72 through a flange. The upper end of the gas outlet sealing mechanism 72 is connected to the gas pipeline port 73 through a flange. The gas outlet sealing mechanism 72 is filled with three low melting point alloys of lead, tin and bismuth.

[0114] The balancing device 6 is arranged above the lower material cover cylinder 21, and a pair of symmetrical lifting ears are arranged on the lower material cover cylinder 21 near the lower material cover end face 22 of the lower material cover 2, and a lifting ear is arranged on the lower material cover cylinder 21 at the top of the lower material cover end face 22 away from the lower material cover 2, and the positions of the three lifting ears are respectively located outside the center of gravity of the lower material cover 2, and all the lifting ears are not on one side of the center of gravity of the lower material cover 2.

[0115] The three lifting ears are respectively connected to an adjustable length steel cable 61, the other end of all the adjustable length steel cables 61 is connected to a steel ring 62, and a first upward tensioner 63 is connected above the steel ring 62. When the lower material cover 2 is lifted, the three adjustable length steel cables 61 are adjusted to make the two sides of the lower material cover 2 symmetrical about the vertical line, and make the axis of the lower material cover 2 parallel to the axis of the inclined kiln tail 1. The tension of the first tensioner 63 is equal to the gravity of the lower material cover 2. The balancing device 6 also includes a frame 64 arranged on both sides and above the lower material cover 2, which is used to withstand the tension generated by the first tensioner 63. The first tensioner 63 is a constant force spring hanger, one end of the constant force spring hanger is connected to the steel ring 62, and the other end is connected to the frame 64.

[0116] The balancing device 6 also includes at least one pair of second tensioners 65 of equal size and opposite direction in the horizontal direction arranged between the two sides of the lower material cover cylinder 21 and the frame 64. The second tensioner 65 is a constant force spring hanger. One end of the constant force spring hanger is connected to one side of the lower material cover cylinder 21, and the other end is connected to the frame 64. The tension value is not greater than 5% of the gravity of the lower material cover 2.

[0117] Example 2

[0118] like Figure 3 , Figure 4 As shown, the difference between this embodiment and embodiment 1 is that:

[0119] (1) The adjusting member 14 is an adjusting bolt;

[0120] (2) The outer wall of the kiln tail 1 is provided with inclined plates instead of spiral blades;

[0121] (3) Cooling air is passed through the cooling nozzle 16;

[0122] (4) The distance between the end surface 22 of the lower material cover 2 and the end surface of the kiln tail 1 is 0.8 m;

[0123] (5) The gas outlet 71 is disposed on the end surface 22 of the lower material cover 2, and the gas outlet 71 is a 90° elbow that changes from horizontal to upward;

[0124] (6) The first tensioner 63 in the balancing device 6 is a pulley mechanism.

[0125] Example 3

[0126] like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that:

[0127] (1) The gas outlet 71 is arranged on both sides of the material discharging cover cylinder 21, and the gas outlet 71 is a 90° elbow that changes from horizontal to downward, the gas pipeline opening 73 is below the gas outlet 71, and the gas outlet sealing mechanism 72 is between the gas outlet 71 and the gas pipeline opening 73. One end of the gas outlet 71 is welded to the side of the material discharging cover cylinder 21, and the other end of the gas outlet 71 is connected to the upper end of the gas outlet sealing mechanism 72 through a flange, and the lower end of the gas outlet sealing mechanism 72 is connected to the gas pipeline opening 73 through a flange;

[0128] (2) The balancing device 6 is provided with four lifting ears (not shown in the figure) above the lower material cover cylinder 21. In order to make the lower material cover 2 balanced and stable, a pair of symmetrical lifting ears are provided on the lower material cover cylinder 21 close to the lower material cover end face 22 of the lower material cover 2, and a pair of lifting ears are provided on the lower material cover cylinder 21 away from the lower material cover end face 22 of the lower material cover 2. The positions of the four lifting ears are respectively located outside the center of gravity of the lower material cover 2, and all the lifting ears are not on one side of the center of gravity of the lower material cover 2. The lifting ears are respectively connected to an adjustable length steel cable 61, and the other end of all the steel cables 61 is connected to a steel ring 62. A first upward tensioner 63 is connected above the steel ring 62. When the lower material cover 2 is suspended, the four adjustable length steel cables 61 are adjusted to make the axis of the lower material cover 2 parallel to the axis of the inclined kiln tail 1;

[0129] (3) The second tensioner 65 is a pulley mechanism.

[0130] Example 4

[0131] like Figure 6 As shown, the difference between this embodiment and embodiment 1 is that:

[0132] The gas outlet system 7 and the discharge system 3 are combined into one, and share the same discharge system 3. The gas is separated after reaching the discharge bin.

[0133] Comparative Example 1

[0134] In order to adapt to high-temperature sealing, the sealing mechanism uses graphite packing, which causes two problems: first, the gas cannot be sealed; second, in order to seal, the graphite packing is pressed tightly, resulting in the kiln body being unable to rotate.

[0135] Comparative Example 2

[0136] In order to make the lower material cover exert less force on the rotary kiln, four pressure springs are arranged under the lower material cover. Since the four pressure springs cannot balance the gravity of the lower material cover, and even the difference is far from that, the guide slip ring is seriously worn, and the guiding protection of the sealing mechanism cannot be provided, resulting in the rubber sealing ring having a short sealing life.

[0137] Comparative Example 3

[0138] The feed port system, the gas outlet system and the feed cover are fixedly connected, so that the feed cover has no space to move, and the guide slip ring cannot play a guiding role, resulting in excessive wear of the rubber sealing ring and loss of sealing function.

[0139] In summary, the dynamic sealing structure provided by the present application has a good overall sealing effect, is suitable for coal or biomass pyrolysis rotary kiln, and can improve the problem of poor sealing due to rotary kiln jumping in the prior art. The rotary kiln equipment including the above dynamic sealing structure has strong practicality and broad application prospects.

[0140] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dynamic sealing structure, characterized in that: It includes kiln tail, material discharge cover, sealing mechanism, guiding mechanism and balancing device; The lower material cover comprises a lower material cover cylinder and an end surface of the lower material cover connected to the lower material cover cylinder, the lower material cover cylinder is sleeved on the outer side of the circumferential wall of the kiln tail, and the end surface of the lower material cover is spaced apart from the end surface of the kiln tail; The sealing mechanism is arranged between the lower material cover cylinder and the kiln tail and is connected to the inner wall of the lower material cover cylinder; The guide mechanism is arranged between the inner wall of the lower material cover cylinder and the outer side of the kiln tail and is located on one side or both sides of the sealing mechanism along the axis direction of the rotary kiln. There is a rotation gap between the guide mechanism and the kiln tail so that the sealing mechanism and the kiln tail are coaxial. The balancing device is connected to the outer side of the lower material cover cylinder and is used to control the lower material cover to apply a force not greater than 10% of the gravity of the lower material cover to the kiln tail in any direction; The dynamic sealing structure also includes a discharge system, which is arranged below the barrel of the material discharge cover. The discharge system includes a discharge port, a discharge port sealing mechanism, and a receiving material bin port. The discharge port is located between the end surface of the kiln tail and the end surface of the material discharge cover. One end of the discharge port is connected to the bottom of the barrel of the material discharge cover, and the other end is connected to the receiving material bin port through the discharge port sealing mechanism. The discharge port sealing mechanism is filled with liquid low-temperature alloy. The low-temperature alloy filled in the feed port sealing mechanism includes lead, tin and bismuth.

2. The dynamic sealing structure according to claim 1, characterized in that: The distance between the end surface of the lower material cover and the end surface of the kiln tail in the axial direction of the kiln tail is 0.3-2.0m.

3. The dynamic sealing structure according to claim 1, characterized in that: The guide mechanism is located on both sides of the sealing mechanism along the axial direction of the rotary kiln.

4. The dynamic sealing structure according to claim 1, characterized in that: The rotation gap is larger than the sum of the cylindricity error of the kiln tail and the cylindricity error of the lower material cover cylinder.

5. The dynamic sealing structure according to claim 1, characterized in that: The sealing mechanism comprises at least one rubber sealing ring.

6. The dynamic sealing structure according to claim 5, characterized in that: When the number of the rubber sealing rings is greater than 1, the plurality of rubber sealing rings are arranged at intervals along the axial direction of the kiln tail.

7. The dynamic sealing structure according to claim 5, characterized in that: The sealing mechanism is a herringbone rubber sealing ring with two sealing lips.

8. The dynamic sealing structure according to claim 7, characterized in that: The concession or compensation of the sealing lip is within 6 mm.

9. The dynamic sealing structure according to claim 1, characterized in that: The dynamic sealing structure also includes a sealing smooth sliding belt arranged on the outside of the kiln tail, a first ring plate is connected between the smooth sliding belt and the end face of the kiln tail, a second ring plate is connected to the end of the smooth sliding belt away from the end face of the kiln tail, a first gap is provided between the second ring plate and the outer wall of the kiln tail, and a plurality of adjustment parts for adjusting the size of the first gap are provided between the second ring plate and the outer wall of the kiln tail along the circumferential direction.

10. The dynamic sealing structure according to claim 9, characterized in that: The outer wall of the kiln tail between the first ring plate and the second ring plate is provided with multi-head spiral blades or inclined plates forming an angle with the axis of the kiln tail.

11. The dynamic sealing structure according to claim 10, characterized in that: A second gap is provided between the multi-start spiral blades and the inner side wall of the smooth sliding belt or between the inclined plate and the inner side wall of the smooth sliding belt.

12. The dynamic sealing structure according to claim 9, characterized in that: A cooling nozzle is arranged on the outer side of the end surface of the adjusting member away from the kiln tail.

13. The dynamic sealing structure according to claim 9, characterized in that: The sealing mechanism and the guiding mechanism are arranged between the lower material cover cylinder and the smooth sliding belt.

14. The dynamic sealing structure according to claim 9, characterized in that: The sealing mechanism is a "human" rubber sealing ring with two sealing lips, and the sealing lips of the "human" rubber sealing ring are in contact and sealed with the smooth sliding belt.

15. The dynamic sealing structure according to claim 14, characterized in that: When the number of the "human" rubber sealing rings is greater than 1, a first spacer ring is provided between two adjacent "human" rubber sealing rings, and a second spacer ring is provided on the outer side of the outermost "human" rubber sealing ring.

16. The dynamic sealing structure according to claim 15, characterized in that: The guide mechanism is composed of two guide slip rings, which are respectively arranged on the outer sides of the second spacer ring, and a third gap is arranged between the guide slip rings and the smooth sliding belt.

17. The dynamic sealing structure according to claim 16, characterized in that: A fixing piece is arranged on the outer side of the guide slip ring, and the fixing piece includes a step on the inner wall of the fixing slip ring or the lower material cover cylinder.

18. The dynamic sealing structure according to claim 17, characterized in that: The guide slip ring is a wear-resistant copper slip ring.

19. The dynamic sealing structure according to claim 7, characterized in that: The "human" rubber sealing ring is provided with a first oil hole for filling lubricating oil.

20. The dynamic sealing structure according to claim 16, characterized in that: The guide slip ring is provided with a second oil hole for filling lubricating oil.

21. The dynamic sealing structure according to claim 1, characterized in that: The low-temperature alloy filled in the feed port sealing mechanism consists of lead, tin and bismuth.

22. The dynamic sealing structure according to claim 1, characterized in that: The dynamic sealing structure also includes a gas outlet system, which includes a gas outlet, a gas outlet sealing mechanism and a gas pipeline opening. The gas outlet is arranged on the lower material cover, one end of the gas outlet is connected to the lower material cover, and the other end is connected to the gas pipeline opening through the gas outlet sealing mechanism. The gas outlet sealing mechanism is filled with liquid low-temperature alloy.

23. The dynamic sealing structure according to claim 22, characterized in that: The gas outlet is arranged at the top of the cylinder of the lower material cover and is connected with the lower material cover.

24. The dynamic sealing structure according to claim 22, characterized in that: The gas outlet is arranged on the end surface of the lower material cover and is connected with the lower material cover.

25. The dynamic sealing structure according to claim 22, characterized in that: The gas outlet is arranged on one side or both sides of the cylinder of the lower material cover and is connected with the lower material cover.

26. The dynamic sealing structure according to claim 22, characterized in that: The coal gas outlet system and the discharging system share a discharging system.

27. The dynamic sealing structure according to claim 26, characterized in that: The low-temperature alloy filled in the gas outlet sealing mechanism consists of lead, tin and bismuth.

28. The dynamic sealing structure according to claim 1, characterized in that: The balancing device comprises a lifting lug connected to the outer wall of the lower material cover cylinder, a plurality of the lifting lugs are arranged at intervals, the positions of the plurality of lifting lugs are all located outside the center of gravity of the lower material cover and all the lifting lugs are not on the same side of the center of gravity of the lower material cover.

29. The dynamic sealing structure according to claim 28, characterized in that: Each of the lifting ears is connected to a steel cable with adjustable length, and the other ends of all the steel cables away from the lifting ears are connected to a steel ring.

30. The dynamic sealing structure according to claim 29, characterized in that: A first tensioner pointing upward is connected above the steel ring.

31. The dynamic sealing structure according to claim 30, characterized in that: The first tensioner is a pulley mechanism or a constant force spring hanger.

32. The dynamic sealing structure according to claim 30, characterized in that: The balancing device further comprises a frame arranged on both sides and above the lower material cover, and the frame is used to bear the tension generated by the first tensioner.

33. The dynamic sealing structure according to claim 32, characterized in that: The balancing device further comprises at least one pair of second horizontal tensioners arranged between the two sides of the cylinder of the lower material cover and the frame, and the tensions of each pair of the second horizontal tensioners in the horizontal direction are equal in magnitude and opposite in direction.

34. The dynamic sealing structure according to claim 33, characterized in that: The second horizontal tensioner is a pulley mechanism or a constant force spring hanger.

35. The dynamic sealing structure according to claim 34, characterized in that: The pulling force of the second horizontal tensioner is not greater than 5% of the gravity of the lower material cover.

36. A rotary kiln device, characterized in that: The rotary kiln equipment comprises a dynamic sealing structure as described in any one of claims 1-35.

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