CN115751924B - Center cylinder returning steam rotary dryer, method and system - Google Patents
Center cylinder returning steam rotary dryer, method and system Download PDFInfo
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- CN115751924B CN115751924B CN202310010549.8A CN202310010549A CN115751924B CN 115751924 B CN115751924 B CN 115751924B CN 202310010549 A CN202310010549 A CN 202310010549A CN 115751924 B CN115751924 B CN 115751924B
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Abstract
The invention provides a central cylinder returning steam rotary dryer, a method and a system, which belong to the technical field of drying for eliminating liquid from solid materials or products, wherein the dryer at least comprises: the device comprises a cylinder body and at least one return pipe in the inner cavity of the cylinder body, wherein the first end of the return pipe is communicated with the inner cavity of the cylinder body at the feeding side of the cylinder body, and the second end of the return pipe is communicated with the inner cavity at the discharging side of the cylinder body; the inner cavity of the cylinder body comprises a mixing section, a heat exchange section and a discharging section, the mixing section is positioned at the feeding side of the cylinder body, and a mixing internal part is fixed on the inner wall of the cylinder body of the mixing section; the heat exchange section is positioned between the mixing section and the discharging section, and a heat exchange tube is fixed in the inner cavity of the cylinder body of the material exchange section; the invention adopts the self-returning structure of the central cylinder, has no influence on the external diameter of the cylinder body, further reduces the diameters of all parts of the cylinder body rotary driving structure, and can effectively reduce the occupied area.
Description
Technical Field
The invention relates to the technical field of drying for eliminating liquid from solid materials or products, in particular to a central cylinder returning steam rotary dryer, a method and a system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The steam rotary dryer is widely applied to drying of various block-shaped and powdery materials, a heat exchange tube is arranged in a cylinder body, the materials pass through the cylinder body outside the heat exchange tube, independent heat exchange media (common steam) pass through the heat exchange tube, the heat exchange media are not contacted with the materials, and indirect heat exchange is carried out between the heat exchange media and the materials through the heat exchange tube so as to realize material drying.
In the calcined soda industry, a self-return type steam rotary calciner is usually adopted, and mainly comprises a feeder, a furnace end, a furnace body, a furnace tail, a discharging device, a supporting device and a transmission device, wherein a return pipe is arranged outside a cylinder body of the dryer, materials enter the dryer from the furnace end, and the return pipe is connected with the furnace tail and the furnace end to realize the mixing of dry and wet materials.
The inventor finds that the existing self-basic steam rotary calciner has the following problems:
(1) The rotation of the cylinder body generally needs the cooperation of rotary driving structures such as a riding wheel blocking device, a rear rolling ring, a riding wheel device, a front rolling ring, a transmission device, a large gear ring and the like, and the mode of arranging a return pipe on the outer side of the cylinder body increases the overall outer diameter of the cylinder body, so that the size and the strength of each rotary driving structure are increased, and the cost is increased; the external return pipe is required to bear the mechanical force of the whole cylinder body, and has higher stress requirement on the return pipe; meanwhile, the whole occupied area of the dryer is increased, and the civil engineering cost is increased;
(2) The self-return type steam rotary calciner adopts a mode of combining a furnace end and a furnace body, a return pipe is connected with the furnace body and the furnace end, spans from a furnace tail to the furnace end, has high requirement on accuracy during assembly, is easy to leak otherwise, and has poor stability; when the furnace body is overhauled, the furnace end is required to be disassembled and assembled again, and the tightness after assembly is influenced again; the installation and maintenance difficulties are high;
(3) The return pipes of the self-return type steam rotary calciner are distributed outside the cylinder body at certain intervals, the cylinder body is required to rotate to a certain angle to enable materials to return into the cylinder body, the mode that the materials return into the cylinder body is in a discontinuous state, and the return materials and wet materials cannot be in continuous contact, so that the mixing effect is affected. Moreover, the self-alkali-returning type steam rotary calciner mostly adopts a straight pipe steam rotary dryer, and the material is contacted with the heat exchange pipe in a cross flow manner after entering the furnace body, so that the impact effect on the heat exchange pipe is large, and particularly when the material with high abrasiveness is treated, the abrasion of the heat exchange pipe is serious;
(4) Patent CN114183998A discloses a steam rotary integrated machine and a method for drying high-humidity high-viscosity materials, which discloses that a material guide plate and a material shoveling plate are arranged at the position of a material inlet on the inner wall of a cylinder, however, the material shoveling plate only has the function of lifting the materials, the lifted materials are scattered by a cleaning chain and then move forwards under the action of the material guide plate, and under the condition that the material mixing section is arranged to be shorter, the sufficient material mixing cannot be realized only by means of scattering the materials by means of shoveling.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a central cylinder returning steam rotary dryer, a method and a system, which adopt a central cylinder self returning structure, have no influence on the external diameter of a cylinder, further reduce the diameters of all parts of a cylinder rotary driving structure and can effectively reduce the occupied area; the rotary driving structure of the cylinder body is characterized in that all parts of the rotary driving structure of the cylinder body are arranged outside the cylinder body, and the material returning pipe does not need to bear the mechanical force of the whole cylinder body, so that the structural stability is improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the first aspect of the invention provides a central drum return steam rotary dryer.
A central drum return steam rotary dryer comprising: the device comprises a cylinder body and at least one return pipe in the inner cavity of the cylinder body, wherein the first end of the return pipe is communicated with the inner cavity of the cylinder body at the feeding side of the cylinder body, and the second end of the return pipe is communicated with the inner cavity at the discharging side of the cylinder body;
the barrel inner chamber includes compounding section, heat exchange section and ejection of compact section, and the compounding section is located barrel charge-in side, is fixed with the compounding internals on the barrel inner wall of compounding section, and the heat exchange section is located between compounding section and the ejection of compact section, and the barrel inner chamber internal fixation of reloading section has the heat exchange tube.
As an alternative implementation mode, an overflow end plate is arranged between the heat exchange section and the discharging section, overflow holes and discharge holes are formed in the overflow end plate, and the discharge holes are distributed at the edge positions of the overflow end plate at intervals.
As an alternative implementation manner, the second end of the return pipe is provided with at least one return valve for controlling the flow rate of the return material.
As an alternative implementation, a helical blade for pushing the material from the material side to the feed side is provided in the return pipe.
As an alternative implementation manner, the material mixing internal part comprises a material guiding plate, a material returning plate and a cleaning chain, wherein the material guiding plate and the material returning plate are spiral plates with a certain inclination angle, the material guiding plate is used for lifting and throwing materials and driving the materials to move towards the heat exchange section when the cylinder rotates, and the material returning plate is used for lifting and throwing the materials and enabling part of the materials to move towards the feeding side of the cylinder when the cylinder rotates.
As an alternative implementation mode, the material mixing internals comprise three components of a material guiding plate, a material returning plate and a cleaning chain, wherein the material guiding plate and the material returning plate respectively comprise at least one size, and the three component strips of the material guiding plate, the material returning plate and the cleaning chain are uniformly arranged on the inner wall of the cylinder body according to set intervals.
As an optional implementation manner, the discharging section is located at the discharging side of the cylinder, a discharging cover is arranged at the position of the discharging section of the cylinder, and at least one first through hole for discharging the drying materials and at least one second through hole for discharging the drying tail gas are arranged on the cylinder in the discharging cover.
As an optional implementation manner, the material mixing internal part comprises at least one component of a material guiding plate, a material returning plate and a cleaning chain, wherein the material guiding plate and the material returning plate respectively comprise at least one size, and the components are uniformly arranged on the inner wall of the cylinder body according to a set interval.
As an optional implementation mode, a plurality of knocking devices are fixed on the outer wall of the cylinder body of the mixing section, one knocking ball is arranged in each knocking device, and each knocking ball knocks the cylinder body once every time the cylinder body rotates for one circle.
As a further limitation, a first fixed base is arranged on the inner wall of the cylinder, and the mixing material internal piece is detachably fixed on the first fixed base.
As a further limitation, a first fixed base is arranged on the inner wall of the cylinder, and the mixing material internal part is directly fixed on the first fixed base.
As an optional implementation manner, a second fixed base is arranged on the inner wall of the cylinder body, and the mixing material overflow plate is detachably fixed on the second fixed base.
As an alternative implementation mode, a second fixed base is arranged on the inner wall of the cylinder body, and the mixing material overflow plate is directly fixed on the second fixed base.
As an optional implementation mode, a mixing overflow plate is fixed on the inner wall of the cylinder body between the mixing section and the heat exchange section, when the heat exchange pipe is an annular heat exchange pipe, the mixing overflow plate is arranged in a partition mode along the circumferential direction in the inner cavity of the cylinder body, and the number of the partitions of the mixing overflow plate is the same as that of the annular heat exchange pipe.
As an optional implementation mode, a mixing overflow plate is fixed on the inner wall of the cylinder body between the mixing section and the heat exchange section, and when the heat exchange pipe is an annular heat exchange pipe, the mixing overflow plate is arranged in a partition mode along the circumferential direction in the inner cavity of the cylinder body.
As an optional implementation manner, the device also comprises a retaining roller device, a rear rolling ring, a riding roller device, a front rolling ring, a transmission device and a large gear ring, wherein the rear rolling ring, the front rolling ring and the large gear ring are sequentially arranged on the outer side of the cylinder;
the riding wheel blocking device is connected with the rear rolling ring, the riding wheel device is connected with the front rolling ring, and the transmission device is connected with the large gear ring; the end of the discharging side of the cylinder body is communicated with a steam chamber, and a rotary joint is arranged on an opening of one end of the steam chamber far away from the cylinder body.
The second aspect of the invention provides an operation method of the central cylinder returning steam rotary dryer.
The invention relates to an operation method of a central cylinder returning steam rotary dryer, which comprises the following steps of:
wet materials enter the cylinder body through the feeding port;
the wet materials sequentially pass through the mixing section, the heat exchange section and the discharging section and then are output to dry materials through the discharging cover; wherein, the mixing section receives the dry material of the discharging section through the return pipe so as to realize the mixing of the dry material and the wet material.
The third aspect of the invention provides a central cylinder returning steam rotary drying system, which comprises the central cylinder returning steam rotary dryer of the first aspect of the invention.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the central cylinder returning steam rotary dryer, the method and the system, the central cylinder returning structure is adopted, and the traditional steam rotary dryer is upgraded and improved, so that the steam rotary dryer has the returning and mixing functions.
2. According to the central cylinder returning steam rotary dryer, the method and the system, the provided central cylinder returning structure can replace a traditional external returning device, and independent returning conveying equipment and mixing equipment are not needed to be additionally arranged, so that the equipment is more compact, occupied space is reduced, and equipment investment, civil engineering cost and operation cost are reduced.
3. According to the central cylinder returning steam rotary dryer, the method and the system, the central cylinder returning structure is adopted, an independent returning device is omitted, the failure rate can be reduced, and the stability of a drying system is improved.
4. According to the central cylinder returning steam rotary dryer, the method and the system, the mixing internal parts are fixed in the cylinder body, so that the disturbance of materials in the cylinder can be enhanced, and the mixing effect of dry materials and wet materials can be enhanced.
5. The invention adopts the central cylinder material returning pipe, the material returning device is arranged in the cylinder body, the outside diameter of the cylinder body is not influenced, the diameters of the rolling ring and the gear ring are consistent with those of a common steam rotary dryer, the diameters of the rolling ring and the gear ring are reduced, the occupied area can be reduced, the manufacturing cost is reduced, and the transportation and installation difficulty is reduced.
6. The material returning device is arranged in the cylinder, the rolling ring and the gear ring can be fixed on the outer surface of the cylinder, and the material returning pipe does not need to bear the mechanical force of the whole cylinder, so that the stress structure of the dryer is good; the strength requirement on the central return pipe is low, and the design, the processing and the manufacturing are easy.
7. According to the invention, through the conveying of the spiral blades in the central cylinder, the materials can be uniformly distributed in the material returning pipe, the material returning mode is continuous, the feeding state of the returned dry materials is the same as that of the wet materials fed continuously, the continuous contact of the dry materials and the wet materials is facilitated, the possibility of the contact between the wet materials and the surfaces of the parts in the cylinder is reduced, and the sticking of the materials in the cylinder is prevented.
8. According to the central cylinder returning steam rotary dryer disclosed by the first aspect of the invention, the traditional furnace end is eliminated, the equipment is more compact, a large flange and a large dynamic seal for connecting the furnace end are not needed, and the investment of the furnace end part is reduced; the stability of the cylinder body is improved, leakage points are reduced, and the running environment can be improved.
9. The material mixing internals of the invention are arranged by adopting the combination of the material guide plates and the material return plates with various types, so that the movement of dry and wet materials in a material mixing section can be greatly enhanced, and good material mixing effect is ensured; the compounding section has set up detachable compounding internals and compounding overflow plate, can nimble change compounding internals, can make things convenient for the installation and the change of heat exchange tube again.
10. The material mixing internal part comprises the material guide plate, the material returning plate and the cleaning chain, wherein the material guide plate and the material returning plate are spiral plates with certain inclination angles, the material guide plate is used for lifting and throwing materials and driving the materials to move towards the heat exchange section when the cylinder rotates, and the material returning plate is used for lifting and throwing the materials and enabling part of the materials to move towards the feeding side of the cylinder when the cylinder rotates, so that a better material mixing effect is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of an external return process provided in the background;
fig. 2 is a schematic structural diagram of a central drum return steam rotary dryer provided in embodiment 1 of the present invention;
FIG. 3 is a detailed schematic view of the rotary joint at position A in FIG. 2 provided in embodiment 1 of the present invention;
fig. 4 is a detailed schematic diagram of the riding wheel device at position B in fig. 2 provided in embodiment 1 of the present invention;
FIG. 5 is a detailed schematic of the transmission at position C in FIG. 2 provided in embodiment 1 of the present invention;
FIG. 6 is a detailed schematic diagram of the riding wheel device at the D position in FIG. 2 provided in embodiment 1 of the present invention;
FIG. 7 is a detailed schematic diagram of the heat exchange tube at position E in FIG. 2 provided in example 1 of the present invention;
FIG. 8 is a detailed schematic of the steam chamber at position F in FIG. 2 provided in example 1 of the present invention;
fig. 9 is a schematic structural view of a central tube return tube according to embodiment 1 of the present invention;
FIG. 10 is a schematic diagram of a mixing internal part according to embodiment 1 of the present invention;
wherein, 1, a feeder; 2. a steam rotary dryer; 3. a discharging device; 4. air locking discharge valve; 5. a hoist; 6. a return control valve; 7. a return conveyor; 8. a mixer; 9. a cylinder; 10. a central cylinder return pipe; 11. a return valve; 12. a mixing internal part; 13. a material mixing overflow plate; 14. a heat exchange tube; 15. a supporting roller device; 16. a rear rolling ring; 17. a riding wheel device; 18. a front rolling ring; 19. a transmission device; 20. a large gear ring; 21. a discharge cover; 22. a manhole; 23. a steam chamber; 24. a rotary joint; 25. a knocking device; 26. a helical blade; 27. a first material guide plate; 28. a second material guide plate; 29. a material guide plate III; 30. cleaning a chain; 31. a first material returning plate; 32. a second material returning plate; 33. and a returning charge plate III.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1:
except for the self-returning basic steam rotary calciner mentioned in the background art, the material returning process of the steam rotary dryer commonly used at present is external material returning, namely, a part of dry materials are returned to the material feeding end of the dryer by using conveying equipment outside the dryer, and the dry materials and the wet materials are fully mixed by mixing equipment and then are jointly fed into the dryer, as shown in figure 1, the material returning process comprises a feeder 1, a steam rotary dryer 2, a discharger 3, an air locking discharge valve 4, a lifter 5, a material returning control valve 6, a material returning conveyor 7 and a mixer 8; the external material returning process realizes the mixing of returned materials and dry and wet materials, but needs to additionally add a plurality of devices, and mainly has the following problems: (1) The independent material returning and conveying equipment and the material mixing equipment for dry and wet materials are required to be additionally arranged, so that the investment and the operation cost are increased; (2) Because the material returning equipment is more, the occupied area and the occupied space are increased, and the civil engineering cost is increased; (3) The failure rate of the drying system is increased, and single equipment damage can affect the overall performance of the drying system, even causing production interruption.
In view of the problems existing in the prior art, embodiment 1 of the present invention provides a central drum returning steam rotary dryer, as shown in fig. 2, 3, 4, 5, 6, 7 and 8, a drum 9, a heat exchange tube 14, a riding wheel device 15, a rear rolling ring 16, a riding wheel device 17, a front rolling ring 18, a transmission device 19, a large gear ring 20, a discharge cover 21, a steam chamber 23 and a rotary joint 24, wherein the rear rolling ring 16, the front rolling ring 18 and the large gear ring 20 are sequentially arranged on the outer side of the drum 9, the riding wheel device 15 is connected with the rear rolling ring 16, the riding wheel device 17 is connected with the front rolling ring 18, and the transmission device 19 is connected with the large gear ring 20;
in the embodiment, 1 central cylinder return pipe 10 is arranged in the cylinder 9, the central cylinder return pipe 10 is fixed at the central position of the cylinder 9, the first end of the central cylinder return pipe 10 is communicated with the inner cavity of the cylinder 9 at the feeding side of the cylinder 9, and the second end of the central cylinder return pipe 10 is communicated with the inner cavity at the discharging side of the cylinder 9, so that dry materials can be conveyed from the discharging end to the feeding end;
it will be appreciated that in other embodiments, the number of the central cylinder return pipes 10 may be more (e.g., 2 or 3 or more), and those skilled in the art may adapt to the specific dryer size, and will not be described in detail herein.
The inlet of the central cylinder return pipe 10 is provided with a return valve 11, and the return dry material quantity can be adjusted through the opening of the return valve 11 so as to achieve the purpose of controlling the return ratio;
as shown in fig. 9, a spiral blade 26 is arranged in the central cylinder return pipe 10, the spiral blade 26 has a certain height and an inclination angle, and under the rotation action of the cylinder 9, the material can be pushed from the discharge end to the feed end of the dryer.
The difference between the dryer of the embodiment and the traditional self-returning type steam rotary calciner is that the central cylinder material returning structure is adopted, the equipment cylinder 9 has no material returning pipe, and the furnace end device and the discharging cover 21 of the self-returning type steam rotary calciner have more compact structure; meanwhile, the equipment does not have a large flange and a large dynamic seal for connecting the furnace end, so that the investment of the furnace end part is reduced; the stability of the cylinder 9 is improved; meanwhile, leakage points are reduced, and the running environment can be improved.
According to the functional division, from the feeding end to the discharging end, the whole cylinder 9 can be divided into a mixing section, a heat exchange section and a discharging section;
the compounding section is located the feed side of central section of thick bamboo returning charge steam rotary dryer, and the compounding section is fixed with compounding internals 12 in a section of thick bamboo, and compounding internals 12 are by stock guide, returning charge board and clean chain 30 constitution.
The material guiding plate and the material returning plate are spiral plates with certain inclination angles, and the material guiding plate has the functions of pushing materials from a material feeding end to a material discharging end, and meanwhile, the materials can be lifted and thrown, so that the flow of the materials in the cylinder 9 is enhanced; the material returning plate has the functions of reversely conveying materials, returning a part of the materials from the discharging side to the feeding side, and simultaneously, lifting and throwing the materials to strengthen the flow of the materials in the cylinder 9; through the conveying and throwing actions of the material guide plate and the material returning plate, dry and wet materials can move vigorously in the cylinder 9, and good mixing is achieved.
The device can be divided into a first type model, a second type model, a third type model and the like according to different inclination angles, widths and lengths; the material guiding plates and the material returning plates with different types are arranged in the cylinder 9 according to a certain rule and form a material mixing internal part 12 together with the cleaning chain; the reasonably arranged material mixing internal parts 12 can obviously disturb the materials in the cylinder, strengthen the movement amplitude of the materials, enable the dry materials and the wet materials to be better mixed, clean the materials adhered in the cylinder by the cleaning chain, and prevent the unmixed wet materials from being adhered in the cylinder 9;
as shown in fig. 10, the mixing internals 12 comprise: the material guiding plate I27, the material guiding plate II 28, the material guiding plate III 29, the cleaning chain 30, the material returning plate I31, the material returning plate II 32 and the material returning plate III 33, wherein the material guiding plate I comprises three types of material guiding plates and three types of material returning plates, and better material mixing is realized.
In the embodiment, a plurality of knocking devices 25 are arranged on the outer wall of the barrel 9 of the mixing section, one knocking ball is arranged in each knocking device 25, and each knocking ball knocks the barrel 9 once every time the barrel 9 runs for one circle; the materials adhered on the inner wall of the cylinder 9 and the inner mixed material piece 12 fall off under the knocking action, so that the materials are further prevented from adhering and scarring in the cylinder 9.
The central cylinder returning steam rotary dryer of the embodiment can be a straight pipe type steam rotary dryer or a ring pipe type steam rotary dryer.
In this embodiment, the inner wall of the barrel 9 of the mixing section is provided with a first fixing base, the mixing internals 12 are all detachable structures and are fixed on the first fixing base by bolts, and the structure can avoid interference between the mixing internals 12 and the heat exchange tube 14, thereby facilitating convenient installation and replacement of the heat exchange tube 14.
It will be appreciated that in other embodiments, for smaller sized drum return steam rotary dryers, the mixing internals 12 may be made in a non-removable configuration, while the discharge end plate may be made as a flange, the discharge end plate may be removed, and the heat exchange tubes 14 installed or replaced from the discharge side of the bowl 9.
It will be appreciated that the mixing inner member 12 may be formed by only one or two inner members in addition to the three structures of the guide plate, the return plate and the chain, and other inner structures with mixing function besides the above structures are also included in the scope of the present invention.
The rear part of the mixing section is provided with a mixing overflow plate 13, the function of the mixing overflow plate is to increase the height of a material layer of the mixing section, increase the filling rate, facilitate better mixing of dry materials and wet materials, the mixing overflow plate 13 is also of a detachable structure, and the mixing overflow plate 13 is arranged in a partitioned manner in the circumferential direction;
when used in a loop type steam rotary dryer, the number of zones is consistent with the number of zones of the annular heat exchange tube 14; the direction of the material mixing overflow plate 13 in the circumferential direction is consistent with the arrangement direction of the annular heat exchange tubes 14, the material mixing overflow plate 13 is fixed on a second fixed base on the inner wall of the cylinder 9 through bolts, the direction of the second fixed base is consistent with the tube supporting direction of the annular heat exchange tubes 14, and the structure design can avoid interference between a supporting seat of the material mixing overflow plate 13 and the annular heat exchange tubes 14, so that the installation and the replacement of the annular heat exchange tubes 14 are convenient;
when the device is used for a straight pipe type steam rotary dryer, the number of the subareas is based on convenience in maintenance.
It will be appreciated that in other embodiments, the mixing overflow plate 13 may be of alternative construction, and may be selected for non-use depending on the characteristics of the material.
The heat exchange section is positioned in the middle of the dryer, is an arrangement area of the heat exchange tubes 14, provides a heat exchange surface for material heat exchange, and is an effective heat exchange area of the steam rotary dryer.
The ejection of compact section is located central section of thick bamboo returning charge steam rotary dryer rear portion, this position is equipped with ejection of compact cover 21, be equipped with a plurality of through-holes on the barrel 9 in the ejection of compact cover 21, the barrel 9 is all discharged from barrel 9 through-holes to the material after drying and dry tail gas, dry material is discharged from the discharge gate of ejection of compact cover 21 below, dry tail gas is discharged from the gas outlet of ejection of compact cover 21 top, be equipped with observation hole and manhole 22 on the ejection of compact cover 21, can observe the desiccator ejection of compact condition from the observation hole, perhaps overhaul in entering the desiccator from manhole 22.
An overflow end plate is arranged between the heat exchange section and the discharging section, and an overflow hole and a discharge hole are arranged on the overflow end plate, wherein the structure of the overflow hole is the same as that of a traditional ring pipe split type steam rotary dryer, the height of the overflow hole is adjustable, and the dried materials are discharged from the overflow hole.
As an optional implementation manner, the discharge holes are arranged at the bottom of the overflow end plate, and 3-5 discharge holes are uniformly distributed circumferentially (those skilled in the art can select according to specific working conditions, and are not repeated here).
In the embodiment, the rear part of the discharging side is communicated with the steam chamber 23, and the steam chamber 23 and the rotary joint 24 realize the distribution of steam and condensed water. So, whole central section of thick bamboo returning charge steam rotary dryer constitutes a complete whole, except possessing the dry function of traditional ring canal split type steam rotary dryer, still possesses returning charge, compounding's function to the characteristics that traditional ring canal split type steam rotary dryer compact structure, heat transfer area are big, heat exchange tube 14 easy to assemble and change have been reserved.
More specifically, the present embodiment provides the following application examples:
sodium chloride drying device with capacity of 40 ten thousand tons/year. The water content of the feed is 3%, the water content of the product is 0.1%, the feed temperature is 50 ℃, and the heating steam pressure is 0.8MPa (G).
The traditional steam rotary dryer without self-returning function is adopted for drying, and the material flow is as follows: blendor proposal → screw feeder → steam rotary dryer → product discharge valve → transfer screw conveyor. Wherein, transport screw conveyer middle part and be equipped with the returning charge discharge gate, the returning charge flow is: variable-frequency discharge valve-return screw conveyor (or scraper conveyor) -return bucket elevator-mixer. In addition to the dryer, at least 7 conveyor apparatuses are required, the total assembly machine power of which is about 110kW.
Adopts a central cylinder returning steam rotary dryer, and the material flow is as follows: screw feeder-central cylinder returning steam rotary dryer-product discharge valve-transfer screw conveyor. Because the central cylinder returning steam rotary dryer has the functions of returning and mixing materials, no additional returning equipment is needed. Except for the dryer, the drying system only requires 3 conveying devices, and the total assembly machine power of the conveying devices is about 30kW. Because the dryer with the self-returning function is adopted, the process is simplified, the number of conveying equipment is reduced, and the energy consumption is greatly reduced.
Example 2:
the embodiment 2 of the invention provides an operation method of a central cylinder returning steam rotary dryer, which comprises the following steps of:
wet materials enter the cylinder 9 through a feed port;
the wet materials sequentially pass through the mixing section, the heat exchange section and the discharging section and then are output to dry materials through the discharging cover 21; wherein, the mixing section receives the dry material of the discharging section through the return pipe so as to realize the mixing of the dry material and the wet material.
Example 3:
the embodiment 3 of the invention provides a central cylinder returning steam rotary drying system, which comprises the central cylinder returning steam rotary dryer in the embodiment 1 of the invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides a central section of thick bamboo returning charge steam rotary dryer which characterized in that:
comprising the following steps: the device comprises a cylinder body and at least one return pipe in the inner cavity of the cylinder body, wherein the first end of the return pipe is communicated with the inner cavity of the cylinder body at the feeding side of the cylinder body, and the second end of the return pipe is communicated with the inner cavity at the discharging side of the cylinder body;
the inner cavity of the cylinder body comprises a mixing section, a heat exchange section and a discharging section, the mixing section is positioned at the feeding side of the cylinder body, mixing internals are fixed on the inner wall of the cylinder body of the mixing section, the heat exchange section is positioned between the mixing section and the discharging section, and a heat exchange pipe is fixed in the inner cavity of the cylinder body of the material exchange section;
the material mixing internal part comprises a material guide plate, a material returning plate and a cleaning chain, wherein the material guide plate and the material returning plate are spiral plates with a certain inclination angle, the material guide plate is used for lifting and throwing materials and driving the materials to move towards the heat exchange section when the cylinder rotates, and the material returning plate is used for lifting and throwing the materials and enabling part of the materials to move towards the feeding side of the cylinder when the cylinder rotates;
the inner cavity of the cylinder body is provided with the material mixing overflow plates in a partitioning mode along the circumferential direction, the number of the partitioning areas of the material mixing overflow plates is the same as that of the annular heat exchange tubes, and the direction of the material mixing overflow plates in the circumferential direction is consistent with the arrangement direction of the annular heat exchange tubes.
2. The central drum return steam rotary dryer of claim 1 wherein:
the second end of the return pipe is provided with at least one return valve for controlling the flow of the return material, and a spiral blade for pushing the material from the material side to the feeding side is arranged in the return pipe.
3. The central drum return steam rotary dryer of claim 1 wherein:
an overflow end plate is arranged between the heat exchange section and the discharging section, overflow holes and discharge holes are formed in the overflow end plate, and the discharge holes are distributed at the edge positions of the overflow end plate at intervals.
4. The central drum return steam rotary dryer of claim 1 wherein:
the discharging section is positioned at the discharging side of the cylinder body, a discharging cover is arranged at the position of the discharging section of the cylinder body, and at least one first through hole for discharging the drying materials and at least one second through hole for discharging the drying tail gas are arranged on the cylinder body in the discharging cover.
5. The central drum return steam rotary dryer of claim 1 wherein:
a plurality of knocking devices are fixed on the outer wall of the cylinder body of the mixing section, one knocking ball is arranged in each knocking device, and each knocking ball at least knocks the cylinder body once when the cylinder body rotates for one circle.
6. The central drum return steam rotary dryer of claim 1 wherein:
the inner wall of the cylinder body is provided with a first fixed base, and the mixing internal part is detachably fixed on the first fixed base; or the inner wall of the cylinder body is provided with a first fixed base, and the mixing internal parts are directly fixed on the first fixed base.
7. The central drum return steam rotary dryer of claim 1 wherein:
the inner wall of the barrel is provided with a second fixed base, and the mixing overflow plate is detachably fixed on the second fixed base.
8. The central drum return steam rotary dryer of claim 1 wherein:
the inner wall of the barrel is provided with a second fixed base, and the mixing overflow plate is directly fixed on the second fixed base.
9. The central drum return steam rotary dryer of claim 1 wherein:
the inner wall of the cylinder body between the mixing section and the heat exchange section is fixedly provided with mixing overflow plates, the inner cavity of the cylinder body is provided with mixing overflow plates in a partitioning mode along the circumferential direction, and the number of the partitions of the mixing overflow plates is the same as that of the annular heat exchange tubes.
10. The central drum return steam rotary dryer of claim 1 wherein:
the device also comprises a retaining riding wheel device, a rear rolling ring, a riding wheel device, a front rolling ring, a transmission device and a large gear ring, wherein the rear rolling ring, the front rolling ring and the large gear ring are sequentially arranged on the outer side of the cylinder;
the riding wheel blocking device is connected with the rear rolling ring, the riding wheel device is connected with the front rolling ring, and the transmission device is connected with the large gear ring; the end of the discharging side of the cylinder body is communicated with a steam chamber, and a rotary joint is arranged on an opening of one end of the steam chamber far away from the cylinder body.
11. The operation method of the center cylinder returning steam rotary dryer is characterized by comprising the following steps of:
use of a central drum return steam rotary dryer according to any one of claims 1-10, comprising the following process: wet materials enter the cylinder body through the feeding port; the wet materials sequentially pass through the mixing section, the heat exchange section and the discharging section and then are output to dry materials through the discharging cover; wherein, the mixing section receives the dry material of the discharging section through the return pipe so as to realize the mixing of the dry material and the wet material.
12. The utility model provides a central section of thick bamboo returning charge steam gyration drying system which characterized in that:
a centre barrel return steam rotary dryer comprising any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310010549.8A CN115751924B (en) | 2023-01-05 | 2023-01-05 | Center cylinder returning steam rotary dryer, method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310010549.8A CN115751924B (en) | 2023-01-05 | 2023-01-05 | Center cylinder returning steam rotary dryer, method and system |
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| CN115751924A CN115751924A (en) | 2023-03-07 |
| CN115751924B true CN115751924B (en) | 2023-04-28 |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201772706U (en) * | 2010-03-23 | 2011-03-23 | 曲靖市雨明科技有限责任公司 | Roller dryer |
| KR101243986B1 (en) * | 2012-08-23 | 2013-03-19 | 주식회사 화성테크윈 | Drying apparatus for waste material |
| CN203572158U (en) * | 2013-12-05 | 2014-04-30 | 重庆市酉阳县酉好化肥有限公司 | Knocking type rotary dryer |
| CN108592611A (en) * | 2018-06-29 | 2018-09-28 | 山东科院天力节能工程有限公司 | A method of it being used for the steam rotary drying system of ammonium salt and prepares ammonium salt |
| CN209197359U (en) * | 2018-11-30 | 2019-08-02 | 湖南省湘衡盐化有限责任公司 | A kind of drying system based on steam rotary dryer |
| CN217504157U (en) * | 2021-11-18 | 2022-09-27 | 中国纺织科学研究院有限公司 | Paddle type dryer |
| CN114183998A (en) * | 2021-12-10 | 2022-03-15 | 山东天力能源股份有限公司 | Steam rotation all-in-one machine and method for drying high-humidity and high-viscosity materials |
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