Crystalline salt drying device
By using dual-axis reverse synchronous rotation and asymmetrical blade layout, combined with a reverse spiral guide groove design, the problem of dead zone at the edge of the hollow blade dryer was solved, achieving uniform drying of high-viscosity crystalline salt slurry and reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-03-27
AI Technical Summary
Existing hollow paddle dryers, due to the uniform length of the symmetrical paddles, cannot effectively reach the edge area of the drying chamber, causing material to accumulate and crystallize over time. In severe cases, this can lead to equipment jamming. Furthermore, adding fixed baffles increases energy consumption and has limited cleaning effect.
It adopts an asymmetric blade layout with dual-axis counter-rotating synchronous rotation, combined with a reverse spiral guide channel design. The long blades break up edge agglomerates, while the short blades and spiral guide channels work together to guide the material flow, forming a shear force field and avoiding synchronous accumulation.
It significantly improves the drying uniformity and efficiency of high-viscosity crystalline salt slurry, reduces edge dead zones, shortens drying time, and reduces unit energy consumption.
Smart Images
Figure CN224050900U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to drying equipment technical field especially relates to a crystalline salt drying device. BACKGROUND
[0002] As a kind of high-efficiency conduction type drying equipment, hollow paddle dryer is widely used in drying treatment of high viscosity material in chemical industry, environmental protection and other fields. Traditional hollow paddle dryer usually adopts symmetrical paddle layout, that is, all paddles on paddle shaft are consistent in length and uniformly distributed, and material is stirred and heat is transferred by paddle rotation.
[0003] However, the existing hollow paddle dryer cannot effectively reach the edge area of drying cavity due to the consistent length of symmetrical paddles, leading to long-term accumulation of material to form crystallization, and even causing equipment jam in serious cases. In the prior art, fixed baffle is additionally provided to guide material flow, but the interference between baffle and rotating paddle will lead to increased energy consumption, and the removal effect on edge dead zone is limited.
[0004] How to improve drying efficiency and reduce drying dead zone has become one of the technical problems to be solved at present. INVENTION CONTENTS
[0005] Therefore, the utility model provides a crystalline salt drying device.
[0006] The technical scheme of the utility model is realized as follows: the utility model provides a crystalline salt drying device, which comprises a drying cavity, a hollow paddle shaft and a driving device, two hollow paddle shafts are arranged in parallel and rotatably in the drying cavity, the driving device is in transmission connection with the two hollow paddle shafts and drives the two hollow paddle shafts to rotate reversely and synchronously, and long paddles and short paddles are alternately arranged on the hollow paddle shaft along the axial direction.
[0007] In the above implementation mode, the two hollow paddle shafts are in transmission connection through gear set, the hollow paddle shaft is hollow inside, used for passing heating medium, corresponding connecting structure is arranged on the outside of the drying cavity, used for communicating with the hollow paddle shaft, so as to provide heating medium, and the connection is dynamically sealed. The two parallel paddle shafts rotate reversely to form shear force field, enhance turbulent mixing effect of material, and avoid synchronous accumulation caused by same direction rotation. The long paddles extend to cavity wall to break edge agglomerate, the short paddles concentrate in central area, and long and short paddles are alternately used to realize axial sectional stirring. Bidirectional shear force is applied to material by double-shaft reverse motion, and viscosity reduction rate is improved by 20%-30%; the asymmetric paddle group eliminates edge dead zone of traditional symmetric paddle
[0008] In some implementation modes, the length ratio of long paddle to short paddle is (1.5-2.5):1.
[0009] In the above embodiments, the long paddle length covers 80%-95% of the radius of the drying cavity, and the area directly contacting the cavity wall breaks up the agglomerates; the short paddle length is limited to 40%-66% of the length of the long paddle, avoiding excessive stirring in the central region that causes particle breakage.
[0010] In some embodiments, a spiral flow guide groove is provided on the inner wall of the drying cavity, the depth of the spiral flow guide groove is 3-8 mm, and the spiral angle is 10°-30°.
[0011] In the above embodiments, a depth of 3-8 mm matches the flow characteristics of high-viscosity materials, too shallow (<3 mm) flow guides fail, and too deep (>8 mm) causes material to be retained; an angle of 10°-30° balances the axial thrust and circumferential resistance, meeting the laminar flow-transition flow state requirement of Reynolds number Re=100-500.
[0012] In some embodiments, the spiral direction of the spiral flow guide groove is opposite to the rotation direction of at least one hollow paddle shaft.
[0013] In the above embodiments, the reverse spiral design generates a thrust force opposite to the centrifugal force of the paddle, forming a "counter-current scouring" effect; fluid mechanics simulation shows that the shear rate of the inner wall of the flow guide groove is increased by 1.8-2.5 times when the rotation directions are opposite.
[0014] In some embodiments, the cross section of the spiral flow guide groove is arc-shaped, and the fillet radius of the groove bottom is not less than 1.5 mm.
[0015] In the above embodiments, the arc-shaped cross section reduces flow separation phenomena and reduces the probability of local vortex generation; a fillet radius of the groove bottom ≥1.5 mm prevents crack propagation caused by sharp corner stress concentration.
[0016] In some embodiments, the installation planes of adjacent long and short paddles on the same hollow paddle shaft are at an angle of 10°-30°.
[0017] In the above embodiments, the installation plane angle refers to the angle between the installation planes of adjacent long and short paddles on the same shaft (i.e., the staggered angle of the paddle roots in the circumferential direction of the shaft), and an angle of 10°-30° allows the adjacent long and short paddles to form a progressive stirring region in the circumferential direction, avoiding repeated stirring of the material that causes energy waste.
[0018] In some embodiments, the surfaces of the long and short paddles are covered with a polytetrafluoroethylene layer.
[0019] In the above embodiments, the surface energy of the PTFE coating is ≤18 mN / m, which is lower than the surface energy of salt crystals (about 50 mN / m), achieving a non-adhesion interface; the coating thickness is 0.1-0.3 mm, which takes into account the heat conduction and anti-sticking requirements.
[0020] In some embodiments, the edges of the long and short paddles are provided with sawtooth-shaped protrusions.
[0021] In the above embodiments, the sawtooth structure generates a local high-pressure area, promoting the breaking of salt slurry clumps; the protrusion height is 0.5-1.5mm, the interval is 3-5mm, and the balance between shear efficiency and wear resistance is optimized.
[0022] The utility model discloses have the following beneficial effects relative to the prior art:
[0023] The utility model discloses through the alternate layout of double-shaft reverse synchronous rotation and asymmetric paddle, combine reverse helical flow guide groove design, the drying uniformity and efficiency of high viscosity crystalline salt slurry have been improved significantly. Specifically, long paddle breaks the edge clump of drying cavity accurately, and short paddle cooperates helical flow guide groove and guides material directional flow, makes the area of edge dead zone reduce, and drying time shortens, has good application prospect. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.
[0025] Figure 1 It is the front view of crystalline salt drying device of the utility model;
[0026] Figure 2 It is Figure 1 It is the local enlarged view of part A;
[0027] Figure 3 It is the axial view of hollow paddle shaft in crystalline salt drying device of the utility model;
[0028] Figure 4 It is the axial view of the cooperation state of two hollow paddle shafts in crystalline salt drying device of the utility model.
[0029] In the drawing: 1-drying cavity, 2-hollow paddle shaft, 3-driving device, 11-flow guide groove, 21-long paddle, 22-short paddle, 23-polytetrafluoroethylene layer, 24-sawtooth-shaped protrusion. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0031] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0033] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of the present application belong. If the definitions set forth in this section are contrary to or otherwise inconsistent with the definitions set forth in the patents, patent applications, published patent applications, and other publications that are incorporated herein by reference, the definitions set forth in this section are preferred to the definitions incorporated herein by reference.
[0035] As shown in FIG. 1, Figure 1 The present application relates to a crystalline salt drying device, and particularly relates to a crystalline salt drying device. Figures 2-4 The crystalline salt drying device comprises a drying cavity 1, hollow paddle shafts 2 and a driving device 3. The two hollow paddle shafts 2 are arranged in parallel and rotatably in the drying cavity 1. The driving device 3 is in transmission connection with the two hollow paddle shafts 2 and drives the two hollow paddle shafts 2 to rotate reversely and synchronously. Long paddles 21 and short paddles 22 are alternately arranged on the hollow paddle shafts 2 along the axial direction.
[0036] In the above embodiment, two hollow paddle shafts 2 are arranged in parallel in the drying cavity 1, and reverse synchronous rotation is achieved through a gear box. Long paddles 21 and short paddles 22 are alternately welded on each shaft along the axial direction, the end of the long paddle is 2 mm away from the cavity wall, and the short paddle covers the central area. The reverse rotation of the double shafts forms a shear force field, and the material is subjected to bidirectional shear force, the long paddle breaks the edge agglomeration, and the short paddle prevents the center from accumulating, thereby cooperatively eliminating the dead zone.
[0037] In some embodiments, the length ratio of the long paddle 21 to the short paddle 22 is (1.5-2.5):1.
[0038] In the above embodiment, the length of the long paddle 21 is 1.5-2.5 times (preferably 2.0 times) the length of the short paddle 22, the end of the long paddle extends to 1-5 mm away from the cavity wall, and the length of the short paddle is not more than 1.2 times the diameter of the paddle shaft. The long paddle covers 80%-95% of the radius, directly contacts the cavity wall to break the agglomeration, and the length of the short paddle is limited to avoid excessive breaking in the center.
[0039] In some embodiments, a spiral flow guide groove 11 is arranged on the inner wall of the drying cavity 1, the depth of the spiral flow guide groove 11 is 3-8 mm, and the spiral angle is 10°-30°.
[0040] In the above embodiment, four spiral flow guide grooves 11 are processed on the inner wall of the drying cavity 1, the groove depth is 5 mm, the spiral angle is 20°, the groove width is 12 mm, and the flow guide grooves continuously extend from the feeding port 11 to the discharging port 12. The depth of 3-8 mm matches the flow characteristics of high-viscosity materials, and the angle of 10°-30° balances the axial propulsion force and the circumferential resistance.
[0041] In some embodiments, the spiral direction of the spiral flow guide groove 11 is opposite to the rotation direction of at least one hollow paddle shaft 2.
[0042] In the above embodiment, the left paddle shaft rotates clockwise, and the corresponding flow guide groove 11 is counterclockwise spiral; the right paddle shaft rotates counterclockwise, and the flow guide groove is in the same direction or the right flow guide groove is clockwise spiral, which is opposite to the rotation direction of the right paddle shaft. The reverse spiral generates a propulsion force opposite to the centrifugal force of the paddle, forms a “counter-current flushing”, and the shear rate of the inner wall of the flow guide groove is improved. The edge material has a lower backmixing rate, and the unit energy consumption is reduced.
[0043] In some embodiments, the cross section of the spiral flow guide groove 11 is arc-shaped, and the groove bottom radius is not less than 1.5 mm.
[0044] In the above embodiment, the arc-shaped cross section reduces flow separation and reduces local vortex, and the round angle is ≥1.5 mm to prevent stress concentration cracks.
[0045] In some embodiments, the installation planes of adjacent long paddles 21 and short paddles 22 on the same hollow paddle shaft 2 are at an angle of 10°-30°.
[0046] In the above embodiment, the included angle forms a spiral stirring track, and the material moves along a zigzag path; the staggered angle reduces the peak torque. The motor load fluctuation coefficient can be reduced, and the drying uniformity index is improved.
[0047] In some embodiments, the surfaces of the long blades 21 and the short blades 22 are covered with a polytetrafluoroethylene layer 23.
[0048] In the above embodiment, the polytetrafluoroethylene layer has a lower surface energy, which can reduce the adhesion of crystalline salt, and the thickness of the polytetrafluoroethylene layer should be controlled at about 0.2 mm, so as to avoid the decrease of the thermal conductivity coefficient.
[0049] In some embodiments, the edges of the long blades 21 and the short blades 22 are provided with serrated protrusions 24.
[0050] In the above embodiment, the serrations generate local high-pressure areas to break up the lumps.
[0051] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A drying apparatus for crystalline salt, characterized in that, The utility model relates to a kind of drying device, including: Dry cavity (1), hollow paddle shaft (2) and driving device (3), two hollow paddle shafts (2) are rotationally arranged in dry cavity (1) in parallel, driving device (3) is drivingly connected with two hollow paddle shafts (2), and two hollow paddle shafts (2) are driven to reverse synchronous rotation, long paddle (21) and short paddle (22) are alternatively arranged on the hollow paddle shaft (2) along the axis direction.
2. The crystalline salt drying apparatus of claim 1, wherein The length ratio of long paddle (21) and short paddle (22) is (1.5-2.5):
1.
3. The crystalline salt drying apparatus of claim 1, wherein The inner wall of the dry cavity (1) is provided with a spiral flow guide groove (11), the depth of the spiral flow guide groove (11) is 3-8mm, and the spiral angle is 10°-30°.
4. The crystalline salt drying apparatus of claim 3, wherein The spiral direction of the spiral flow guide groove (11) is opposite to the rotation direction of at least one hollow paddle shaft (2).
5. The crystalline salt drying apparatus of claim 3, wherein The cross section of the spiral flow guide groove (11) is arc-shaped, and the bottom corner radius is not less than 1.5mm.
6. The crystalline salt drying apparatus of claim 1, wherein, The installation plane angle of adjacent long paddle (21) and short paddle (22) on the same hollow paddle shaft (2) is 10°-30°.
7. The crystalline salt drying apparatus of claim 1, wherein The surface of the long paddle (21) and short paddle (22) is covered with a polytetrafluoroethylene layer (23).
8. The crystalline salt drying apparatus of claim 1, wherein, The edge of the long paddle (21) and short paddle (22) is provided with a serrated protrusion (24).