Coal mine slurry flocculation collaborative grading mixing sedimentation device and method

Abstract

According to the coal mine slurry flocculation collaborative graded mixing and settling device and method, by arranging a graded mixing structure of the preliminary mixing barrel, the premixing unit and the main mixing unit, preliminary mixing, premixing and main mixing from top to bottom are achieved, and multi-gradient accurate mixing is achieved; the pre-mixing unit constructs a strong shear flow field through composite motion of revolution and rotation to complete macroscopic dispersion of a flocculation agent; by arranging the spiral mixing unit, a continuous shear flow field is formed, and the mixing uniformity is improved; when the spiral mixing units rotate, the pushing effect of the crossed spiral mixing blades, the jet flow effect of the jet flow holes and the flow channel restraining effect of the flow guide plates are coupled, a composite reinforced flow field of axial conveying, radial shearing and local jet flow is constructed in the premixing barrel, and forced shearing dispersion and macroscopic premixing of a flocculation agent and coal mine slurry are achieved. And by adjusting the rotating speed of the hybrid driving unit, the fluid with different solid content rates and viscosities can be adapted, and flexible regulation and control of a flow field are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal slurry treatment and fluid mixing equipment, and particularly relates to a coal slurry flocculation and grading mixing and settling device and method. BACKGROUND

[0002] In the fields of coal washing, separation and tailings treatment, the flocculation treatment of coal slurry is a key link to improve resource utilization. The mixing effect of flocculants and coal slurry directly determines the flocculation form, settling rate and dewatering efficiency, and further affects the energy consumption and environmental protection indicators of subsequent processes. The existing coal slurry flocculation mixing device still has the following problems in actual application: first, the mixing gradient is single, and the traditional mixing structure is difficult to realize precise gradient mixing of flocculants and coal slurry, resulting in uneven flocculation and disordered particle size distribution; second, the flow field regulation flexibility is insufficient, and the fixed structure cannot dynamically adjust the disturbance intensity according to the solid content and viscosity of the coal slurry, and high solid content coal slurry is prone to have mixing dead angles, and low solid content coal slurry is prone to damage the formed flocculation due to excessive disturbance. SUMMARY

[0003] In order to solve the above technical problems, the present application provides a coal slurry flocculation and grading mixing and settling device and method.

[0004] The first aspect of the present application provides a coal slurry flocculation and grading mixing and settling device, comprising a preliminary mixing cylinder, an outer cylinder, an inner cylinder, a rack, a mixing drive assembly, a pre-mixing unit, a main mixing unit, a settling unit and a discharge unit. The preliminary mixing cylinder and the outer cylinder are sequentially arranged on the rack from top to bottom; the top of the preliminary mixing cylinder is provided with a cover plate, and the side is provided with a coal slurry inlet and a reagent inlet; the bottom of the preliminary mixing cylinder forms a discharge port communicated with the outer cylinder; the mixing drive assembly comprises a mixing drive unit and a first stirring shaft; the mixing drive unit is arranged on the cover plate; the first stirring shaft is in transmission connection with the mixing drive unit and extends into the outer cylinder through the preliminary mixing cylinder; The premixing unit comprises an outer gear ring, a planetary gear, a sun gear, a baffle, a flow guide pipe, a premixing cylinder and a spiral mixing unit; the outer gear ring is arranged on the upper portion of the side wall of the outer cylinder; the baffle is arranged on the first stirring shaft, and a flow channel for fluid to pass through is formed on the baffle; the sun gear is arranged on the first stirring shaft; the planetary gear is arranged below the baffle and is in meshing transmission with the outer gear ring and the sun gear; the premixing cylinder is arranged below the planetary gear; the spiral mixing unit is arranged in the premixing cylinder; the flow guide pipe is arranged below the baffle, one end of the flow guide pipe is in communication with the flow channel, and the other end of the flow guide pipe is in communication with the premixing cylinder; the inner cylinder is arranged inside the outer cylinder; the main mixing unit is arranged in the inner cylinder and is below the premixing unit; the sedimentation unit is arranged below the main mixing unit; and the discharging unit is arranged below the sedimentation unit.

[0005] In some embodiments of the present application, the spiral mixing unit comprises a support and a mixing blade assembly arranged on the support; the support is rotationally arranged in the premixing cylinder; and the mixing blade assembly comprises a plurality of cross spiral mixing blades with diameters arranged according to a preset rule.

[0006] In some embodiments of the present application, a plurality of jet holes are formed on each of the cross spiral mixing blades and are distributed at intervals.

[0007] In some embodiments of the present application, a flow guide plate is arranged on each of the cross spiral mixing blades; and the density of the flow guide plates arranged on each of the cross spiral mixing blades can be the same or different.

[0008] In some embodiments of the present application, the main mixing unit comprises, from top to bottom, a first flow guide stirring blade assembly, a first spiral blade, a reverse transmission assembly, a second spiral blade and a second flow guide stirring blade assembly; the first flow guide stirring blade assembly and the first spiral blade are arranged around the first stirring shaft; one end of the reverse transmission assembly is in transmission connection with the first stirring shaft, and the other end of the reverse transmission assembly is in transmission connection with a second stirring shaft; and the second spiral blade and the second flow guide stirring blade assembly are arranged around the second stirring shaft.

[0009] In some embodiments of the present application, from top to bottom, the diameter of the first spiral blade gradually decreases, and the diameter of the second spiral blade gradually increases.

[0010] In some embodiments of the present application, the first flow guide stirring blade assembly and the second flow guide stirring blade assembly each comprise a plurality of flow guide spiral blades, and each flow guide spiral blade spirally extends around an axis in the same direction.

[0011] In some embodiments of the present application, the main mixing unit further comprises an adjustable angle guide vane assembly; the adjustable angle guide vane assembly comprises a plurality of groups of adjustable angle guide vanes arranged in sequence along the axial direction; each group comprises a plurality of adjustable angle guide vanes arranged circumferentially around the rotation axis.

[0012] In some embodiments of the present application, the lower part of the inner cylinder is funnel-shaped, and the settling unit is arranged in the funnel-shaped space of the inner cylinder; the settling unit comprises a plurality of layers of settling grids arranged at intervals; from top to bottom, the intervals of the settling grids gradually decrease.

[0013] In a second aspect of the present application, a method for the coal slurry flocculation and grading mixed settling device is provided, and the method comprises the following steps: Step S1, the coal slurry enters the primary mixing cylinder from the coal slurry inlet; the flocculation agent enters the primary mixing cylinder from the agent inlet; the coal slurry and the agent are preliminarily contacted in the primary mixing cylinder to form an initial mixed fluid; Step S2, the mixing driving unit drives the first stirring shaft and the sun gear, and drives the second stirring shaft to rotate, and then drives the planetary gear and the spiral mixing unit to revolve and rotate; the initial mixed fluid of the coal slurry and the agent enters the pre-mixing cylinder through the flow channel, the cross-spiral mixing blade realizes axial conveying of the fluid, the jet hole generates local jet disturbance, the guide vane forms a continuous shear flow field, and the axial conveying-radial shearing-local jet composite flow field is coupled to realize forced shearing dispersion and mixing of the initial mixed fluid, and a pre-mixed fluid is formed; Step S3, the pre-mixed fluid enters the inner cylinder, and the main mixing is realized by the first guide stirring vane assembly, the first spiral vane, the second spiral vane, and the second guide stirring vane assembly in sequence; the directions of the first spiral vane and the second spiral vane are opposite, the diameter of the first spiral vane gradually decreases, the diameter of the second spiral vane gradually increases, the initial dispersion pushing, the middle micro-homogenization, and the end stable conveying of the fluid are realized; the adjustable angle guide vane assembly divides the main fluid into a plurality of secondary fluids; Step S4, the fluid first passes through the upper layer of the settling grid with a larger interval, the large particle size flocculation body completes coarse settling, and then passes through the lower layer of the settling grid with a smaller interval, and the small particle size particles complete settling; Step S5, the discharge unit stably guides the slurry after settling and separation to the discharge port for discharge.

[0014] Compared with the prior art, the coal slurry flocculation and grading mixing and settling device has the following advantages and beneficial effects: the coal slurry flocculation and grading mixing and settling device can realize preliminary mixing, pre-mixing and main mixing from top to bottom, and realize multi-gradient accurate mixing of the flocculating agent and the coal slurry through the grading mixing structure of the preliminary mixing cylinder, the pre-mixing unit and the main mixing unit; the pre-mixing unit can accurately guide the fluid after preliminary mixing into the pre-mixing cylinder through the flow guide pipe, and can complete macroscopic dispersion of the flocculating agent through the combined motion of revolution and rotation formed by the outer gear ring, the planet wheel and the sun gear; the spiral mixing unit is arranged to form a continuous shear flow field, further strengthen the dispersion of the flocculating agent and improve the uniformity of mixing; when the spiral mixing unit rotates, the pushing action of the cross spiral mixing blades, the jet action of the jet holes and the flow channel constraint action of the flow guide plates are coupled to build a composite reinforced flow field of “axial transport, radial shear and local jet” in the pre-mixing cylinder, realize forced shear dispersion and macroscopic pre-mixing of the flocculating agent and the coal slurry, and further improve the uniformity of mixing; the rotation speed of the mixing driving unit can be adjusted to adapt to fluids with different solid content and viscosity, and realize flexible regulation and control of the flow field.

[0015] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present text. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings that form a part of this text are used to provide a further understanding of the present text, the illustrative embodiments of the present text and their descriptions are used to explain the present text, and do not constitute an improper limitation on the present text. In the drawings: Figure 1 is a front view of the coal slurry flocculation and grading mixing and settling device provided by an exemplary embodiment of the present application; Figure 2 is a sectional view of the coal slurry flocculation and grading mixing and settling device provided by an exemplary embodiment of the present application; Figure 3 is a structural schematic view of the pre-mixing unit provided by an exemplary embodiment of the present application; Figure 4 is a bottom view of the pre-mixing unit provided by an exemplary embodiment of the present application; Figure 5 is a sectional view of the pre-mixing unit provided by an exemplary embodiment of the present application; Figure 6 is a structural schematic view of the spiral mixing unit provided by an exemplary embodiment of the present application; Figure 7 is a front view of the spiral mixing unit provided by an exemplary embodiment of the present application; Figure 8Figure 1 is a structural schematic diagram of a primary mixing unit, a settling unit and a discharge unit provided by an exemplary embodiment of the present application; Figure 9 Figure 6 is a structural schematic diagram of an adjustable angle guide vane assembly provided by an exemplary embodiment of the present application.

[0017] In the figure: 10, preliminary mixing cylinder; 20, outer cylinder; 30, inner cylinder; 40, frame; 50, mixing driving assembly; 60, preliminary mixing unit; 70, primary mixing unit; 80, settling unit; 90, discharge unit; 101, cover plate; 102, coal slurry inlet; 103, reagent inlet; 501, mixing driving unit; 502, first stirring shaft; 601, outer gear ring; 602, planetary wheel; 603, sun gear; 604, baffle; 605, guide pipe; 606, preliminary mixing cylinder; 607, helical mixing unit; 6071, support; 6072, cross helical mixing blade; 6073, jet hole; 6074, guide vane; 701, first guide stirring blade assembly; 702, first helical blade; 703, reverse transmission assembly; 704, second helical blade; 705, second guide stirring blade assembly; 706, adjustable angle guide vane assembly; 7061, adjustable angle guide vane; 7062, adjustable angle connecting rod assembly; 7063, fixed support; 801, settling grid; 901, discharge driving unit; 902, discharge blade. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other at will.

[0019] In the fields of coal washing, separation and tailings treatment, the flocculation treatment of coal slurry is a key link to improve resource utilization. The mixing effect of flocculants and coal slurry directly determines the shape of flocculation, settling rate and dewatering efficiency, and further affects the energy consumption and environmental protection indicators of subsequent processes. The existing flocculation mixing device for coal slurry still has the following problems in practical application: first, the mixing gradient is single, and the traditional mixing structure cannot realize precise gradient mixing of flocculants and coal slurry, resulting in uneven flocculation and disordered particle size distribution; second, the flow field regulation flexibility is insufficient, and the fixed structure cannot dynamically adjust the disturbance intensity according to the solid content and viscosity of the coal slurry, and high solid content coal slurry is prone to mixing dead angle, and low solid content coal slurry is prone to excessive disturbance to the formed flocculation.

[0020] Based on this, the example embodiment of the present application provides a coal slurry flocculation and grading mixing and settling device, which can realize preliminary mixing, pre-mixing and main mixing from top to bottom through the grading mixing structure of the preliminary mixing cylinder, the pre-mixing unit and the main mixing unit, and realize multi-gradient precise mixing of flocculants and coal slurry; the pre-mixing unit can accurately guide the fluid after preliminary mixing into the pre-mixing cylinder by setting the flow guide pipe, and can construct a strong shear flow field through the compound motion of revolution and rotation by setting the outer gear ring, the planet wheel and the sun gear, and complete the macro dispersion of flocculants; by setting the spiral mixing unit, a continuous shear flow field is formed to further strengthen the dispersion of flocculants and improve the uniformity of mixing; when the spiral mixing unit rotates, the pushing action of the cross spiral mixing blade, the jet action of the jet hole and the flow channel constraint action of the flow guide plate are coupled to construct a composite reinforced flow field of "axial transport, radial shear and local jet" in the pre-mixing cylinder, realize the forced shear dispersion and macro pre-mixing of flocculants and coal slurry, and further improve the uniformity of mixing; by adjusting the speed of the mixing drive unit, the fluid with different solid content and viscosity can be adapted to realize flexible regulation of the flow field.

[0021] Embodiment 1: An example embodiment of the present application provides a coal slurry flocculation and grading mixing and settling device, as shown in Figure 1 and 2 The mixing and settling device includes a preliminary mixing cylinder 10, an outer cylinder 20, an inner cylinder 30, a rack 40, a drive assembly, a pre-mixing unit 60, a main mixing unit 70, a settling unit 80 and a discharge unit 90; it can realize preliminary mixing, pre-mixing and main mixing from top to bottom, and realize multi-gradient precise mixing of flocculants and coal slurry.

[0022] The primary mixing barrel 10 and the outer barrel 20 are sequentially arranged on the frame 40 from top to bottom. Preferably, the primary mixing barrel 10 has a whole funnel-shaped configuration, the top of which is provided with a cover plate 101, the side of which is provided with a coal slurry inlet 102 and a reagent inlet 103, and the bottom of which forms a discharge port communicated with the outer barrel 20. The coal slurry inlet 102 and the reagent inlet 103 are both arranged in a tangential direction, which can make full use of the kinetic energy of the fluid when pumped in, so that the coal slurry and the reagent can be cut in at a high speed along the tangential direction of the inner wall of the primary mixing barrel 10. Under the driving of the tangential velocity component, a high-speed rotating flow field is induced in the primary mixing barrel 10, forming a cyclone. In this flow field, the strong centrifugal force and interlayer shear force force the coal slurry and the reagent to produce strong turbulent diffusion instantaneously. This high-speed circular motion not only greatly increases the specific surface area of the coal slurry and the flocculating agent, but also effectively prevents the local agglomeration or short-circuit flow phenomenon of the reagent in a low-speed state, thereby realizing rapid dispersion and preliminary contact during the downward spiral flow of the fluid, significantly shortening the time required for homogeneous preliminary mixing in a macroscopic sense, and providing a good fluid basis for subsequent fine mixing.

[0023] The mixing driving assembly 50 includes a mixing driving unit 501, a first stirring shaft 502; preferably, the mixing driving unit 501 is an electric motor, and the mixing driving unit 501 is arranged on the cover plate 101; the first stirring shaft 502 is in transmission connection with the mixing driving unit 501 and penetrates through the primary mixing barrel 10 and extends into the outer barrel 20.

[0024] As shown in Figures 3 to 5 The premixing unit 60 includes an outer gear ring 601, a planetary gear 602, a sun gear 603, a baffle 604, a flow guide pipe 605, a premixing barrel 606, and a spiral mixing unit 607; the outer gear ring 601 is arranged on the upper part of the side wall of the outer barrel 20; the baffle 604 is arranged on the first stirring shaft 502, and a flow channel for fluid passing through is formed on the baffle 604; the flow guide pipe 605 is arranged below the baffle 604, one end of which is communicated with the flow channel, and the other end is communicated with the premixing barrel 606; the fluid passes through the flow channel of the baffle 604 into the flow guide pipe 605, and finally into the premixing barrel 606. The fluid entering the premixing barrel 606 flows downward along the cross spiral mixing blades 6072 under the action of gravity.

[0025] The sun gear 603 is fixedly arranged on the first stirring shaft 502, as a core power transmission component, the sun gear 603 can rotate synchronously at a high speed following the first stirring shaft 502, and the torque of the first stirring shaft 502 is transmitted to the periphery; the planetary gear 602 is arranged below the baffle 604, and is in precise meshing transmission with the outer gear ring 601 fixed on the outer side and the sun gear 603 rotating on the inner side; the planetary gear system structure makes the planetary gear 602 obtain the rotating power transmitted by the sun gear 603, and is limited by the track of the outer gear ring 601, so as to generate a complex motion track of rotation around the axis and revolution around the main shaft, and a high-frequency disturbance dynamic flow field is constructed. Preferably, the planetary gears 602 are arrayed in three in the circumferential direction, and are uniformly arranged around the first stirring shaft 502. The structural layout plays a role of forced flow guiding and space segmentation in fluid mechanics, can physically cut and accurately distribute the large fluid flow completed by upstream preliminary mixing before entering the premixing area, and divide the fluid flow into three independent flow channels without interference; each fluid flow enters and is limited in the dedicated premixing cylinder 606 to complete the intensive mixing in a small volume range, and the shear energy density of the unit volume fluid is significantly improved by using the reduced mixing space; the mixing and settling device forms an ordered multi-stage mixing mode of “converging-shunting-independent processing-reconverging” in the overall process, the shunting processing mechanism effectively avoids the short circuit flow and mixing dead angle problems easily occurring in the traditional single large cavity mixing, and can ensure that the coal slurry and the reagent are fully contacted, penetrated and sheared at the microscopic level, so that the uniformity of mixing and the completeness of flocculation reaction are significantly improved.

[0026] The premixing cylinder 606 is fixedly arranged below the planetary gear 602; the spiral mixing unit 607 is arranged in the premixing cylinder 606; the spiral mixing unit 607 includes a support 6071, a mixing blade assembly arranged on the support 6071, and a support bearing arranged on the inner wall of the premixing cylinder 606, the inner ring of the support bearing is connected with the support 6071, and the upper end of the support 6071 is rotatably arranged in the planetary gear 602 through the bearing, so that the support 6071 is rotatably arranged in the premixing cylinder 606, and thus the mixing blade assembly can rotate relative to the premixing cylinder 606.

[0027] The mixing blade assembly includes a plurality of cross-spiral mixing blades 6072 with diameters arranged according to a preset rule. Preferably, from top to bottom, the diameters of the cross-spiral mixing blades 6072 gradually increase first and then gradually decrease. Figure 5As shown, the diameter of the inner cavity of the premixing cylinder 606 also changes adaptively with the diameter of the cross spiral mixing blades 6072, so that the spacing between the diameter of the cross spiral mixing blades 6072 and the inner wall of the premixing cylinder 606 is the same, and thus, with the gradient arrangement of the diameter of the cross spiral mixing blades 6072, the inner cavity structure of the premixing cylinder 606 is adapted, and a variable cross-section flow channel that alternately arranges according to the "contraction-expansion-contraction" rule in the axial direction is constructed in the premixing cylinder 606. When the fluid is forced to enter the premixing cylinder 606 from the top, the fluid is accelerated and compressed when passing through the contraction area and is decelerated and diffused when passing through the expansion area, constrained by the continuous change of the flow channel cross-sectional area. The flow rate of the fluid and the internal pressure periodically and sharply fluctuate with the change of the diameter of the flow channel, and the frequent alternation of the speed gradient forces the fluid layers to be strongly stretched, extruded and dislocated, thereby realizing deep variable gradient mixing, breaking the laminar flow constraint and improving the uniformity of mixing. At the same time, the diameter change profile of the cross spiral mixing blades 6072 and the inner wall profile of the premixing cylinder 606 are highly accurately profiled and fitted, so that the spacing between them remains constant throughout the axial length. This constant micro-gap fit ensures that the edges of the cross spiral mixing blades 6072 can exert continuous strong shearing and scraping action on the near-wall fluid, which can completely eliminate the mixing blind area caused by excessive gap or flow field stagnation, effectively prevent material from sticking to the wall, and avoid the formation of mixing dead angles.

[0028] The unique cross spiral arrangement of the cross spiral mixing blades 6072 can force the fluid to flow in an orderly manner along the complex spiral flow channel enclosed by the cross spiral mixing blades 6072, thereby prolonging the effective path length of the fluid flow and increasing the residence time of the fluid in the mixing zone to enhance the mixing effect. Preferably, as shown in FIG. 6B, the cross spiral mixing blades 6072 are arranged in a staggered manner along the axial direction of the premixing cylinder 606, and the cross spiral mixing blades 6072 are arranged in a staggered manner along the axial direction of the premixing cylinder 606. Figure 6As shown, the blades of two adjacent cross spiral mixing blades 6072 are connected in a staggered cross manner in space, breaking the smoothness of the traditional continuous spiral and forming a non-continuous stepped flow channel; wherein the end of the former cross spiral mixing blade 6072 and the front end of the latter cross spiral mixing blade 6072 partially overlap in the axial projection plane, and this overlapping structure builds a physical cutting barrier at the fluid transition interface, effectively preventing fluid short circuiting. When the fluid flows from upstream through the former cross spiral mixing blade 6072 and enters the latter cross spiral mixing blade 6072, due to the forced deflection of the preset flow guide angle of the latter cross spiral mixing blade 6072, the flow direction and velocity vector of the fluid change abruptly, so that the fluid originally flowing in the single flow channel of the former cross spiral mixing blade 6072 is mechanically cut and forced to flow into different adjacent flow channels when it impacts into the latter cross spiral mixing blade 6072. This fluid redistribution mechanism breaks the original laminar flow line distribution of the fluid and induces radial mixing, so as to greatly improve the mixing effect of the fluid; the fluid passing through the multiple cross spiral mixing blades 6072 arranged continuously in the axial direction will undergo a high-frequency, multi-level "split-shifting-recombination" process, that is, multiple split mixing and recombination, and this exponential liquid phase interface generation rate can make multiple component fluids realize interfacial penetration and sufficient mixing at the micro level in a very short time, further improving the mixing effect.

[0029] When the mixing driving unit 501 drives the sun gear 603 to rotate, the planetary gear 602 can perform revolution around the sun gear 603 and rotation around its own axis, so as to drive the cross spiral mixing blade 6072 to perform revolution and rotation, and construct a strong shear flow field through the combined motion of revolution and rotation, so as to complete the macro dispersion of the flocculating agent. When the planetary gear 602 drives the premixing cylinder 606 to perform revolution around the center of the first stirring shaft 502 through mechanical meshing transmission, the centrifugal inertia field generated by revolution forces the fluid in the premixing cylinder 606 to form a whole spiral flow along the circumferential direction. This large-scale macro motion drives the fluid to migrate and circulate in a large range in the whole mixing cavity, effectively preventing the solid particles from settling and eliminating the macro concentration gradient. At the same time, the cross spiral mixing blade 6072 located in the premixing cylinder 606 is driven to rotate around its own axis at high speed, and the high-speed relative motion between the blade edge and the fluid generates strong radial shear action and high-frequency turbulent pulsation. After the two motion vectors are superimposed and interfered with each other in space, a high-energy three-dimensional coupled flow field of "revolution circulation + rotation shear" is constructed in the premixing cylinder 606. The flow field realizes the rapid macro diffusion and homogenization of the agent in the matrix by using revolution circulation, and realizes the micro dispersion by breaking the fluid laminar boundary layer and crushing the fine agglomerates by using rotation shear. The two work together to greatly improve the dispersion uniformity and mass transfer efficiency of the agent in the coal slurry. At the same time, by adjusting the output speed of the mixing driving unit 501 through frequency conversion, the speed of revolution and rotation can be linearly adjusted synchronously, so as to accurately adapt to fluid working conditions with different solid contents and different viscosities according to the rheological properties of the fluid, for example, increasing the speed for high-viscosity fluid to enhance the shear viscosity breaking ability, or optimizing the speed for low-solid content fluid to avoid excessive turbulence, so as to realize flexible and adaptive regulation of the mixing flow field strength.

[0030] When the fluid flows along the cross spiral mixing blade 6072 from top to bottom, combined with the combined motion of revolution and rotation, the cross spiral mixing blade 6072 can be driven to rotate relative to the premixing cylinder 606, so as to realize strong shear on the fluid, further mix the fluid, and improve the mixing uniformity of the fluid.

[0031] Preferably, as Figure 6 and 7As shown, a plurality of jet holes 6073 are formed on each cross spiral mixing blade 6072 at intervals along the direction of the blade surface. When the fluid flows through the cross spiral mixing blade 6072, the significant pressure gradient established between the pressure surface and the suction surface of the blade during rotation drives part of the fluid to accelerate and spray out through the jet holes 6073. The generated transverse high-speed jet can strongly penetrate the boundary layer main flow along the surface of the cross spiral mixing blade 6072, break the stability of the laminar flow, and achieve cross-regional material exchange and forced convection of the fluid in the radial depth direction on both sides of the cross spiral mixing blade 6072. At the same time, the jet holes 6073 can effectively balance the pressure difference before and after the blade as a "bleeding channel" for pressure release, thereby significantly reducing the hysteresis and overall flow resistance of the high-viscosity material flow, preventing the material from accumulating on the blade surface, and reducing the stirring power consumption. On the other hand, the speed mutation and shearing effect of the fluid when passing through the jet holes 6073 can form high-frequency jet disturbance effects and micro-scale vortices (such as Karman vortex street) at the outlet of the jet holes 6073 and their wake, thereby greatly increasing the collision probability of the fluid, strengthening the local turbulent intensity and micro-dispersion effect.

[0032] Each cross spiral mixing blade 6072 is provided with a flow guide plate 6074. The number of flow guide plates 6074 provided on each cross spiral mixing blade 6072 can be the same or different. The flow guide plate 6074 is plate-shaped and is inclined along the flow direction of the fluid on the cross spiral mixing blade 6072. The first end is fixed on the cross spiral mixing blade 6072, and the second end extends in the flow direction of the fluid and protrudes from the surface of the cross spiral mixing blade 6072. Preferably, the angle between the flow guide plate 6074 and the cross spiral mixing blade 6072 is 15-45°, which can guide the fluid to complete axial transport along the predetermined flow channel, avoid the formation of local mixing dead zones in the cavity, and at the same time, the gap between the flow guide plate 6074 and the cross spiral mixing blade 6072 can form a continuous shear flow field, strengthening the micro-dispersion effect of the material. When the fluid collides with the flow guide plate 6074, vortex can be generated, and the inclined plate surface can guide the fluid to peel off to prevent viscous fluid from adhering. The density of the flow guide plates 6074 provided on cross spiral mixing blades 6072 with different diameters can be the same or different. Preferably, the density of the flow guide plates 6074 provided on the mixing blade with a larger diameter is smaller, which can reduce the fluid resistance, quickly break the fluid stratification, achieve macro-level mixing, and at the same time avoid more energy consumption. The density of the vortex generating component 3026 provided on the cross spiral mixing blade 6072 with a smaller diameter is larger, which can generate high-frequency vortices to achieve fine mixing.

[0033] The strong axial volume pushing effect generated by the rotating cross helix mixing blade 6072, the high-speed transverse penetrating jet effect excited by the blade pressure difference of the jet hole 6073, and the physical cutting and flow channel restriction effect of the guide plate 6074 on the fluid boundary layer are deeply coupled in the dynamics mechanism. The synergistic superposition of these three forces in the space-time dimension reconstructs a complex reinforced flow field in the limited space of the premixing cylinder 606, which integrates "axial forced transport to ensure flux, radial multi-level shear to break agglomeration, and local high-frequency jet disturbance to strengthen micro-mass transfer" in one. This complex flow field efficiently realizes the forced shear dispersion and macroscopic homogenization premixing of the flocculating agent and the coal slurry by continuously breaking the flow lines, inducing large-scale vortexes to break into micro-scale vortexes, and significantly increasing the effective collision frequency between fluid elements, thereby completely eliminating the mixing dead zone and local concentration gradient, and further greatly improving the overall uniformity and stability of the mixing system.

[0034] The inner cylinder 30 is arranged inside the outer cylinder 20; the main mixing unit 70 is arranged in the inner cylinder 30 and below the premixing unit 60. As shown in Figure 8 The main mixing unit 70 includes, from top to bottom, a first guide flow stirring blade assembly 701, a first helical blade 702, a reverse transmission assembly 703, a second helical blade 704, and a second guide flow stirring blade assembly 705; the first guide flow stirring blade assembly 701 and the first helical blade 702 are arranged around the first stirring shaft 502; one end of the reverse transmission assembly 703 is in transmission connection with the first stirring shaft 502, and the other end is in transmission connection with the second stirring shaft; the second helical blade 704 and the second guide flow stirring blade assembly 705 are arranged around the second stirring shaft.

[0035] Preferably, the reverse transmission assembly 703 comprises a fixed cover and a gear transmission assembly arranged inside the fixed cover, the fixed cover being arranged on the side wall of the inner cylinder 30. Through the transmission of the reverse transmission assembly 703, the second stirring shaft can rotate in the direction opposite to that of the first stirring shaft 502; in this way, the second helical blade 704 and the second guide stirring blade assembly 705 can rotate in the direction opposite to that of the first guide stirring blade assembly 701 and the first helical blade 702, so as to induce strong axial propulsion flow and high-intensity radial shear action of the fluid, thereby constructing a complex helical shear mixing flow field; in the limited space of the inner cylinder 30, under the synergistic action of the specific rotation direction of the blades and the reverse rotation driving, two macroscopic flow fields of upward and downward convection and mutual extrusion are forcedly formed, wherein the first guide stirring blade assembly 701 and the first helical blade 702 drive the fluid to accelerate downward, forming a strong downward flow field, and the second helical blade 704 and the second guide stirring blade assembly 705 drive the fluid upward in the opposite direction, forming an upward opposing flow field; the two streams of fluid with huge kinetic energy and opposite directions of motion collide and impact each other violently at the intersection interface, and the kinetic energy of the fluid is instantaneously converted into high-frequency turbulent pulsation energy, thereby forming a high-turbulence mixing area with high shear rate and high energy dissipation rate at the collision center, and the fluid elements in this area undergo chaotic motion and rapid mass exchange, break the flow dead zone, and improve the overall uniformity and dispersion efficiency of the mixing.

[0036] From top to bottom, the diameter of the first helical blade 702 gradually decreases, and the diameter of the second helical blade 704 gradually increases, so that the initial dispersion and pushing of the material, the micro-homogenization in the middle section, and the stable conveying at the end can be realized. Preferably, the first guide stirring blade assembly 701 and the second guide stirring blade assembly 705 each comprise a plurality of guide helical blades, and each guide helical blade extends spirally around the axis in the same rotation direction.

[0037] As Figure 8 and 9As shown, the main mixing unit 70 further comprises an adjustable angle deflector assembly 706; the outer side of the first deflector stirring blade assembly 701 and the first helical blade 702 can be provided with the adjustable angle deflector assembly 706, and the outer side of the second helical blade 704 and the second deflector stirring blade assembly 705 can also be provided with the adjustable angle deflector assembly 706 at the same time, and the lower adjustable angle deflector assembly 706 can be symmetrically arranged with the upper adjustable angle deflector assembly 706. The adjustable angle deflector assembly 706 comprises a plurality of groups of adjustable angle deflectors 7061 arranged in sequence along the axial direction; the projection of the plurality of groups of adjustable angle deflectors 7061 in the axial direction is partially overlapped; the arc-shaped surface and staggered layout of the adjustable angle deflector 7061 divide the main flow into a plurality of secondary flow fields, strengthen the interphase mass transfer through flow shear and flow convergence effect, and can realize high-precision homogeneous mixing of the coal slurry and the flocculating agent and uniform coagulation of the flocculation. Each group comprises a plurality of adjustable angle deflectors 7061 arranged circumferentially around the rotation axis, and the adjustable angle deflector 7061 is preferably arc-shaped and has a gradually changing diameter, and the adjustable angle deflectors 7061 of each group form a funnel-like space to allow the pre-mixed fluid to quickly enter around the first deflector stirring blade assembly 701, so as to guide the fluid to the direction close to the first deflector stirring blade assembly 701 and the first helical blade 702, so that the fluid is fully stirred and mixed by the first deflector stirring blade assembly 701 and the first helical blade 702.

[0038] As shown in the example, Figure 9 As shown, the adjustable angle deflector assembly 706 further comprises an adjustable angle connecting rod assembly 7062 and a fixed support 7063, wherein the fixed support 7063 is fixed on the inner cylinder 30, one end of the adjustable angle connecting rod assembly 7062 is connected to the fixed support 7063, and the other end is connected to the adjustable angle deflector 7061; adjusting the adjustable angle connecting rod assembly 7062 can adjust the inclination angle of the adjustable angle deflector 7061, so as to construct a dynamically adaptive flow field based on the rheological properties of the material flow, and the operator can accurately adjust the inclination angle of the adjustable angle deflector 7061 to reconstruct the flow field boundary conditions according to the real-time changes of the physical parameters such as the solid content and viscosity of the coal slurry; for example, when mixing high-viscosity or shear-thickening fluid, the angle can be adjusted to be larger (i.e. the angle of attack of the adjustable angle deflector 7061 relative to the incoming flow is reduced), the flow path of the fluid is optimized, the windward projection area and shape resistance of the fluid flowing through the adjustable angle deflector 7061 are effectively reduced, and the along-the-way pressure loss caused by high viscosity is inhibited, thereby significantly reducing the flow resistance and system power consumption under the premise of ensuring flowability; while in the large flow or low viscosity working condition, the angle can be adjusted to be smaller (i.e. the angle of attack is increased), the local resistance coefficient of the fluid flow is increased, and the high-speed fluid is forced to have severe flow separation and velocity vector mutation on the surface of the adjustable angle deflector 7061, so as to efficiently convert the huge kinetic energy of the fluid into turbulent energy for dispersing the material, thereby greatly enhancing the shear strength and micro-mixing efficiency inside the flow field.

[0039] The sedimentation unit 80 is arranged below the main mixing unit 70. The lower part of the inner cylinder 30 is funnel-shaped, and the sedimentation unit 80 is arranged in the funnel-shaped space of the inner cylinder 30; the sedimentation unit 80 comprises a plurality of layers of spaced-apart sedimentation grids 801; preferably, the spacing of the sedimentation grids 801 gradually decreases from top to bottom. The fluid after the main mixing enters the variable cross-section sedimentation space, and the funnel-shaped sedimentation space serves as a flow field stabilizing and buffering area, dynamically regulates the apparent flow velocity of the fluid by using the continuous change of the cross-sectional area, induces the fluid to smoothly transition from a high-turbulence mixing state to a stable laminar flow sedimentation state, and maximizes the reduction of fluid disturbance on the sedimentation process. The fluid first flows through the upper layer of large-spacing sedimentation grids 801, which physically divides the macroscopic flow into a plurality of wide laminar flow channels, and under the premise of ensuring the large flux of high solid content fluid passing without blocking, uses the characteristics of large particle size flocs with fast settling velocity to make them quickly overcome the fluid drag and slide down the wall in the wide flow channel, completing the preliminary solid-liquid separation and coarse sedimentation; then the fluid flows through the lower layer of small-spacing sedimentation grids 801, which constructs a high-density narrow laminar flow channel, significantly reduces the vertical distance required for particle sedimentation based on the "shallow pool theory", and at the same time, the narrow flow channel increases the viscous resistance of flow, effectively inhibits the generation of micro-scale vortices to maintain a laminar flow state with extremely low Reynolds number, thereby greatly extending the relative residence time and effective sedimentation path of micro-fine particles in the sedimentation zone, realizing the accurate capture and deep purification of low-settling-rate fine particles, and finally completing the continuous fractional sedimentation operation from coarse particles to fine particles.

[0040] As Figure 2As shown, the lower part of the outer cylinder 20 is provided with a baffle, the side wall of the outer cylinder 20 forms a discharge port, and the discharge unit 90 is arranged below the sedimentation unit 80. The sedimentation unit 80 comprises a discharge driving unit 901 and a discharge blade 902. The discharge driving unit 901 is a motor arranged below the baffle. The discharge blade 902 is arranged in the outer cylinder 20 and is in transmission connection with the discharge driving unit 901. Preferably, the discharge blade 902 is cross-shaped. The discharge driving unit 901 outputs stable torque to drive the discharge blade 902 to continuously rotate at the bottom of the sedimentation zone. On the one hand, the rotating discharge blade 902 can apply controllable light mechanical disturbance to the highly concentrated and settled sediment slurry at the bottom, destroy the thixotropic gel structure or particle bridging formed inside the high-concentration particle accumulation body due to static placement through shearing action, effectively overcome the static friction and adhesion between particles, thereby preventing the solid-phase particles from being hardened, solidified or forming an "arch bridge" to block the discharge port due to excessive compaction, and ensuring that the sediment material always maintains a rheological state with flowability. On the other hand, by using the mechanical thrust and scraping action generated when the discharge blade 902 rotates, the large yield stress and wall friction resistance of the high-concentration slurry can be overcome, and the viscous slurry after sedimentation and separation can be stably guided and forced to converge to the discharge port along the bottom flow guide surface, thereby realizing continuous, uniform and smooth clean discharge of high-solid and high-viscosity slurry, and avoiding poor discharge or dead angle residue.

[0041] Example 2: An example embodiment of the present application provides a method of the coal slurry flocculation and grading mixed sedimentation device as described in example 1, the method comprising the following steps: Step S1, the coal slurry enters the primary mixing cylinder 10 from the coal slurry inlet 102; the flocculating agent enters the primary mixing cylinder 10 from the agent inlet 103; the coal slurry and the agent are preliminarily contacted in the primary mixing cylinder 10 to form an initial mixed fluid; the coal slurry inlet 102 and the agent inlet 103 are both arranged in a tangential direction, so that the coal slurry and the agent can enter in a tangential direction along the inner wall of the primary mixing cylinder 10, forming a rotating flow field in the primary mixing cylinder 10, so that the coal slurry and the agent are quickly dispersed and preliminarily contacted in the circular motion, shortening the preliminary mixing time.

[0042] Step S2, the mixed driving unit 501 drives the first stirring shaft 502 and drives the sun gear 603 and the second stirring shaft to rotate, and then drives the planetary gear 602 and the spiral mixing unit 607 to revolve and rotate; the initial mixed fluid of the coal slurry and the medicament passes through the flow channel and enters the premixing cylinder 606, the cross spiral mixing blade 6072 realizes the axial conveying of the fluid, the jet hole 6073 generates local jet disturbance, the flow guide plate 6074 forms a continuous shear flow field, and the axial conveying-radial shear-local jet composite flow field is coupled to realize the forced shear dispersion and mixing of the initial mixed fluid, and the premixed fluid is formed; in this process, the initial mixed fluid is divided into three independent flow channels; each fluid completes the intensive mixing in the dedicated premixing cylinder 606, so that the mixing and settling device forms a multi-stage mixing mode of "converging-dividing-independent processing-reconverging" as a whole, which can ensure that the coal slurry and the medicament are fully mixed and the uniformity of the mixing is improved.

[0043] Step S3, the premixed fluid enters the inner cylinder 30 and realizes main mixing by passing through the first flow guide stirring blade assembly 701, the first spiral blade 702, the second spiral blade 704 and the second flow guide stirring blade assembly 705 in sequence; the first spiral blade 702 and the second spiral blade 704 are opposite in direction, the upper part forms a downward flow field, the lower part forms an upward flow field, the two oppositely flowing fluids collide violently to form a high-turbulence mixing area, and the uniformity of the mixing is improved; and the diameter of the first spiral blade 702 gradually decreases and the diameter of the second spiral blade 704 gradually increases, so that the initial dispersion and pushing of the fluid, the micro-homogenization in the middle and the stable conveying at the end are realized; at the same time, the adjustable angle flow guide plate assembly 706 divides the main fluid into multiple secondary fluids, strengthens the interphase mass transfer through the shearing and mixing effects of the flow, and cooperatively realizes the high-precision homogeneous mixing of the coal slurry and the medicament and the uniform coagulation of the flocculation body; Step S4, after the main mixing, the mixed fluid first passes through the upper layer of the large-spacing settling grid, and the large-particle-size flocculation body completes the coarse settling; passes through the lower layer of the small-spacing settling grid, prolongs the settling path of the small-particle-size particles, realizes the accurate capture of the fine particles, and completes the fractional settling; Step S5, the discharge unit 90 stably guides the settled and separated slurry to the discharge port for discharge.

[0044] In this application, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that the articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or include the elements inherent to such articles or devices. Without more limitations, the elements defined by the statement "comprising" do not exclude the presence of other identical elements in the articles or devices including the elements.

[0045] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the present disclosure without departing from the spirit and scope of the application. Accordingly, it is intended that such additions and modifications be included within the scope of the application. It is the following claims, including any amendments thereto, which define the scope of the application.

[0046] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A coal slurry flocculation and synergic classification mixing and settling device, characterized in that, It comprises a preliminary mixing cylinder (10), an outer cylinder (20), an inner cylinder (30), a frame (40), a driving assembly, a pre-mixing unit (60), a main mixing unit (70), a sedimentation unit (80) and a discharging unit (90); The preliminary mixing cylinder (10) and the outer cylinder (20) are sequentially arranged on the frame (40) from top to bottom; the top of the preliminary mixing cylinder (10) is provided with a cover plate (101), and the side is provided with a coal slurry inlet (102) and a medicament inlet (103); the bottom of the preliminary mixing cylinder (10) forms a discharge port communicated with the outer cylinder (20); the mixing driving assembly (50) comprises a mixing driving unit (501) and a first stirring shaft (502); the mixing driving unit (501) is arranged on the cover plate (101); the first stirring shaft (502) is in transmission connection with the mixing driving unit (501) and extends into the outer cylinder (20) through the preliminary mixing cylinder (10); The pre-mixing unit (60) comprises an outer gear ring (601), a planetary wheel (602), a sun gear (603), a baffle (604), a flow guide pipe (605), a pre-mixing cylinder (606) and a spiral mixing unit (607); the outer gear ring (601) is arranged on the upper portion of the side wall of the outer cylinder (20); the baffle (604) is arranged on the first stirring shaft (502), and a flow channel for fluid passing through is formed on the baffle (604); the sun gear (603) is arranged on the first stirring shaft (502); the planetary wheel (602) is arranged below the baffle (604) and is in meshing transmission with the outer gear ring (601) and the sun gear (603); the pre-mixing cylinder (606) is arranged below the planetary wheel (602); the spiral mixing unit (607) is arranged in the pre-mixing cylinder (606); the flow guide pipe (605) is arranged below the baffle (604), one end of which is communicated with the flow channel, and the other end is communicated with the pre-mixing cylinder (606); the inner cylinder (30) is arranged inside the outer cylinder (20); the main mixing unit (70) is arranged in the inner cylinder (30) below the pre-mixing unit (60); the sedimentation unit (80) is arranged below the main mixing unit (70); and the discharging unit (90) is arranged below the sedimentation unit (80).

2. The coal slurry flocculation and synergic classification mixing and settling device according to claim 1, characterized in that, The spiral mixing unit (607) comprises a bracket (6071) and a mixing blade assembly arranged on the bracket (6071); the bracket (6071) is rotationally arranged in the pre-mixing cylinder (606); the mixing blade assembly comprises a plurality of cross spiral mixing blades (6072) with diameters arranged according to a preset rule.

3. The coal slurry flocculation and synergic classification mixing and settling device according to claim 2, characterized in that, A plurality of jet holes (6073) are formed on each cross spiral mixing blade (6072) in a spaced distribution.

4. The coal slurry flocculation and synergic classification mixing and settling device according to claim 2, characterized in that, Each of the cross spiral mixing blades (6072) is provided with a guide plate (6074); the density of the guide plates (6074) provided on each of the cross spiral mixing blades (6072) can be the same or different.

5. The coal slurry flocculation synergic classification mixing and settling device according to claim 1, characterized in that, The main mixing unit (70) comprises, from top to bottom, a first guide stirring blade assembly (701), a first spiral blade (702), a reverse transmission assembly (703), a second spiral blade (704), and a second guide stirring blade assembly (705); the first guide stirring blade assembly (701) and the first spiral blade (702) are arranged around the first stirring shaft (502); one end of the reverse transmission assembly (703) is in transmission connection with the first stirring shaft (502), and the other end is in transmission connection with the second stirring shaft; the second spiral blade (704) and the second guide stirring blade assembly (705) are arranged around the second stirring shaft.

6. The coal slurry flocculation and synergic classification mixing and settling device according to claim 5, characterized in that, From top to bottom, the diameter of the first spiral blade (702) gradually decreases, and the diameter of the second spiral blade (704) gradually increases.

7. The coal slurry flocculation and synergic classification mixing and settling device according to claim 5, characterized in that, The first guide stirring blade assembly (701) and the second guide stirring blade assembly (705) each comprise a plurality of guide spiral blades, and each guide spiral blade spirally extends around an axis in the same rotation direction.

8. The coal slurry flocculation synergic classification mixing and settling device according to claim 5, characterized in that, The main mixing unit (70) further comprises an adjustable-angle guide plate assembly (706); the adjustable-angle guide plate assembly (706) comprises a plurality of groups of adjustable-angle guide plates (7061) arranged in sequence in the axial direction; each group comprises a plurality of adjustable-angle guide plates (7061) arranged in a circumferential direction around a rotation axis.

9. The coal slurry flocculation synergic classification mixing and settling device according to claim 1, characterized in that, The lower part of the inner cylinder (30) is funnel-shaped, and the sedimentation unit (80) is arranged in the funnel-shaped space of the inner cylinder (30); the sedimentation unit (80) comprises a plurality of layers of spaced-apart sedimentation grids (801); from top to bottom, the spacing of the sedimentation grids (801) gradually decreases.

10. A method of coal slurry flocculation synergic classification mixing sedimentation apparatus as claimed in any one of claims 1 to 9, characterized in that, The method comprises the following steps: Step S1, the coal slurry enters the preliminary mixing cylinder (10) from the coal slurry inlet (102); the flocculating agent enters the preliminary mixing cylinder (10) from the agent inlet (103); the coal slurry and the agent preliminarily contact in the preliminary mixing cylinder (10) to form an initial mixed fluid; Step S2, the mixing drive unit (501) drives the first stirring shaft (502) and the sun gear (603) and the second stirring shaft to rotate, thereby driving the planet wheel (602) and the spiral mixing unit (607) to revolve and rotate; the initial mixed fluid of the coal slurry and the agent enters the pre-mixing cylinder (606) through the flow channel, the cross spiral mixing blade (6072) realizes axial transportation of the fluid, the jet hole (6073) generates local jet disturbance, the guide plate (6074) forms a continuous shear flow field, and coupling forms a composite flow field of axial transportation-radial shear-local jet, realizes forced shear dispersion and mixing of the initial mixed fluid, and forms a pre-mixed fluid; Step S3, the premixed fluid enters the inner cylinder (30) and sequentially passes through the first flow guide stirring blade assembly (701), the first spiral blade (702), the second spiral blade (704) and the second flow guide stirring blade assembly (705) to realize main mixing; the directions of the first spiral blade (702) and the second spiral blade (704) are opposite, the diameter of the first spiral blade (702) gradually decreases, the diameter of the second spiral blade (704) gradually increases, the initial dispersion pushing, the middle micro-homogenization and the end stable conveying of the fluid are realized; the adjustable angle flow guide plate assembly (706) divides the main fluid into multiple secondary fluids; Step S4, the fluid first passes through the upper layer of the large-pitch settling grid, the large-particle-size flocculation body completes coarse settling, and then passes through the lower layer of the small-pitch settling grid, and the small-particle-size particles complete settling; Step S5, the discharge unit (90) stably guides the slurry after settling and separation to the discharge port for discharge.

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