Powder injection type drying decanter centrifuge

Abstract

The utility model relates to a horizontal screw centrifuge technical field discloses a kind of powder spraying type drying horizontal screw centrifuges, to solve the defect of overcoming the high moisture content of solid phase material of existing horizontal screw centrifuge easy to stick. The utility model is under the centrifugal field by superstrong instantaneous mixing and penetration: in the centrifugal field of up to hundreds even thousands of times gravity acceleration, dry powder particles spouted from powder spout can be "pressed into" the filter cake being extruded by screw conveyor dehydration with very high relative speed, this forced mixing under high G force, far more than ordinary mixer can compare, it can make dry powder instantaneously, uniformly penetrate into the micro-pore structure of filter cake, realize molecular level contact, greatly improve the reaction efficiency and hygroscopic efficiency of drying agent (such as quicklime, fly ash etc.), make the filter cake discharged solid rate significantly improve, and texture loose, uniform.

Description

Technical Field

[0001] This utility model relates to the field of horizontal screw centrifuge technology, and in particular to a powder spraying drying horizontal screw centrifuge. Background Technology

[0002] Horizontal screw discharge sedimentation centrifuges (referred to as horizontal screw centrifuges) are core solid-liquid separation equipment widely used in environmental protection, chemical, food and other industries. Their working principle utilizes the density difference between the solid and liquid phases. In the strong centrifugal force field generated by high-speed rotation, solid particles settle onto the inner wall of the drum, and are then pushed towards the discharge port by a differentially rotating screw conveyor, thus achieving continuous solid-liquid separation.

[0003] The existing technical solutions have the following shortcomings:

[0004] 1. High moisture content and high viscosity of filter cake: The solid material (filter cake) discharged from traditional horizontal screw centrifuges usually has a high moisture content and is in the form of a viscous mud cake, which is not easy to transport, store and process. It often requires large and energy-intensive downstream drying equipment (such as dryers, drying kilns, etc.).

[0005] 2. Material adhesion problem: For highly viscous materials, the filter cake is prone to adhering to the spiral blades and the inner wall of the drum, especially in the cone section (dry zone), which leads to a decrease in conveying efficiency, an increase in equipment torque, an increase in energy consumption, and even blockage and shutdown.

[0006] 3. High subsequent processing costs: The subsequent drying, solidification or modification of filter cake usually adopts external mixing equipment (such as mixer), which has disadvantages such as uneven mixing, dust, large footprint and long process flow.

[0007] Therefore, we need to design a spray-drying horizontal screw centrifuge to solve the problems mentioned above. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the defect of existing horizontal screw centrifuges where the solid material has a high water content and is prone to sticking. This utility model proposes a powder spraying drying horizontal screw centrifuge.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a powder spraying drying horizontal decanter centrifuge, including a horizontal decanter centrifuge body, a sealed outer shell connected to the top of the horizontal decanter centrifuge body, and a feed funnel fixed above the sealed outer shell; a slag discharge port and a liquid discharge port fixed below the horizontal decanter centrifuge body; a differential gear fixed to one side of the horizontal decanter centrifuge body, and a drum connected inside the horizontal decanter centrifuge body at the output end of the differential gear; a spiral transmission assembly connected inside the drum, and a first bearing fixed to the outer side of the spiral transmission assembly shaft; a flow buffer seat fixed above the drum, and a dry powder spraying system provided inside the flow buffer seat; and a feed port clamped on the other side of the horizontal decanter centrifuge body.

[0010] Preferably, the dry powder spraying system includes a flow-retarding plate, a flow-retarding groove, a flow-retarding protrusion, a through pipe, and a dry powder nozzle;

[0011] A flow-slowing plate is installed on the inner wall of the flow-slowing seat, and the two are distributed in a cross pattern. The flow-slowing plate has a flow-slowing groove inside, and the flow-slowing protrusion is distributed inside the flow-slowing groove. A through pipe is fixed below the flow-slowing seat, and its interior is connected to the interior of the flow-slowing seat. Multiple sets of dry powder nozzles are distributed below the flow-slowing seat.

[0012] Preferably, the cross-section of the flow-slowing protrusions is semi-circular, and they are arranged at equal intervals inside the flow-slowing channel.

[0013] Preferably, the dry powder nozzle is shaped like a trumpet, with a filter screen fixed below it, which is connected to the dry powder nozzle by a positioning block.

[0014] Preferably, the spiral blades of the spiral transmission assembly are covered with a wear-resistant layer, which is made by spraying tungsten carbide alloy, embedding ceramic sheets, or overlaying high-hardness alloy.

[0015] Preferably, a torque sensor is fixed to the outside of the differential to detect the pushing resistance of the screw conveyor assembly, and a solid phase moisture content sensor is fixed at the outlet of the slag discharge port below the main body of the horizontal screw centrifuge to detect the dryness of the discharged material.

[0016] Compared with the prior art, the beneficial effects of this utility model include:

[0017] 1. Super-strong instantaneous mixing and penetration under centrifugal force field: In a centrifugal force field with a gravitational acceleration of hundreds or even thousands of times, the dry powder particles sprayed from the spray nozzle are "pressed" into the filter cake being squeezed and dehydrated by the screw conveyor at an extremely high relative speed. This forced mixing under high G force is far superior to that of ordinary mixers. It enables the dry powder to penetrate into the micro-pore structure of the filter cake instantly and evenly, achieving molecular-level contact. This greatly improves the reaction efficiency and moisture absorption efficiency of the drying agent (such as quicklime, fly ash, etc.), resulting in a significant increase in the solid content of the discharged filter cake, and a loose and uniform texture.

[0018] 2. Integrated design, simplified process, and significantly reduced costs: The three steps of separation, mixing, and drying / modification are integrated into one device, which greatly simplifies the process flow, eliminates the need for a large downstream mixer, dryer and its auxiliary conveying equipment, significantly reduces the equipment footprint, infrastructure investment and operating energy consumption, and avoids dust pollution during material transfer. Attached Figure Description

[0019] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model from the front view;

[0021] Figure 2 This is a frontal cross-sectional view of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the flow-retardant plate of this utility model;

[0023] Figure 4 This is a three-dimensional structural diagram of the dry powder nozzle of this utility model.

[0024] The following are the labels in the diagram: 1. Feed hopper; 2. Sealed outer shell; 3. Horizontal screw centrifuge body; 4. Slag discharge port; 5. Liquid discharge port; 6. Differential gear; 7. Flow retarder seat; 8. Flow retarder plate; 9. First bearing; 10. Torque sensor; 11. Drum; 12. Positioning block; 13. Screw conveyor assembly; 14. Solid phase moisture content sensor; 15. Feed inlet; 16. Through pipe; 17. Dry powder nozzle; 18. Flow retarder protrusion; 19. Flow retarder groove; 20. Filter screen. Detailed Implementation

[0025] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0026] To address the technical problem of overcoming the drawback of existing horizontal screw centrifuges where solid materials with high moisture content tend to stick together, the following solution is disclosed, specifically as follows: Figures 1-4 As shown:

[0027] A powder spraying drying horizontal decanter centrifuge includes a horizontal decanter centrifuge body 3, a sealed outer shell 2 connected to the top of the horizontal decanter centrifuge body 3, and a feed funnel 1 fixed above the sealed outer shell 2. A slag discharge port 4 and a liquid discharge port 5 are fixed below the horizontal decanter centrifuge body 3. A differential gear 6 is fixed to one side of the horizontal decanter centrifuge body 3, and a drum 11 is connected inside the horizontal decanter centrifuge body 3 at the output end of the differential gear 6. A spiral conveying assembly 13 is connected inside the drum 11, and a first bearing 9 is fixed to the outside of the rotating shaft of the spiral conveying assembly 13. A flow-retarding seat 7 is fixed above the drum 11, and a dry powder spraying system is provided inside the flow-retarding seat 7. A feed inlet 15 is clamped on the other side of the horizontal decanter centrifuge body 3.

[0028] The dry powder spraying system includes a flow-retarding plate 8, a flow-retarding groove 19, a flow-retarding protrusion 18, a through pipe 16, and a dry powder nozzle 17;

[0029] The flow-slowing plate 8 is set on the inner wall of the flow-slowing seat 7, and the two are distributed in a cross pattern. The flow-slowing plate 8 has a flow-slowing groove 19 inside, and the flow-slowing protrusion 18 is distributed inside the flow-slowing groove 19. A through pipe 16 is fixed below the flow-slowing seat 7, and its interior is connected to the interior of the flow-slowing seat 7. Multiple sets of dry powder nozzles 17 are distributed below the flow-slowing seat 7.

[0030] Specifically, such as Figure 1 , Figure 2 As shown, the dry powder injection function is integrated into the interior of the horizontal screw centrifuge, and the key spatial relationship between the injection nozzle and the solid material conveying zone is defined. This is the basis for achieving internal mixing and drying. At the same time, the special physical environment inside the centrifuge enables the dry powder injection behavior to produce multiple synergistic effects as described in the subsequent claims.

[0031] The cross-section of the flow-slowing protrusions 18 is semi-circular, and they are arranged at equal intervals inside the flow-slowing channel 19.

[0032] Specifically, such as Figure 2 , Figure 3As shown, by using the flow-slowing protrusions 18 and the cross-distribution of the flow-slowing plates 8, the flow rate of dry powder can be slowed down, preventing a large amount of dry powder from directly impacting down and affecting the smooth progress of subsequent work.

[0033] The dry powder nozzle 17 is shaped like a trumpet, and a filter screen 20 is fixed below it. The filter screen 20 is connected to the dry powder nozzle 17 by a positioning block 12.

[0034] Specifically, such as Figure 2 , Figure 4 As shown, by using the dry powder nozzle 17 and the filter screen 20 in cooperation, the dry powder can be filtered to maintain its purity and improve the quality and efficiency of the discharge.

[0035] The spiral blades of the spiral transmission assembly 13 are covered with a wear-resistant layer, which is made by spraying tungsten carbide alloy, embedding ceramic sheets, or overlaying high-hardness alloy.

[0036] Specifically, such as Figure 2 As shown, by setting a wear-resistant layer, the core working parts that come into contact with the dry and hard mixture have sufficient wear resistance, which is the guarantee for the long-term reliable operation of this technology.

[0037] A torque sensor 10 is fixed on the outside of the differential 6 to detect the pushing resistance of the screw conveyor assembly 13. A solid phase moisture content sensor 14 is fixed at the outlet of the slag discharge port 4 below the main body 3 of the horizontal screw centrifuge to detect the dryness of the discharged material.

[0038] Specifically, such as Figure 2 As shown, torque reflects the instantaneous physical properties (viscosity, friction) of the mixture, while moisture content represents the final drying effect. The combination of the two provides the algorithm with a comprehensive, three-dimensional, and delay-free decision-making basis.

[0039] In this embodiment, firstly, feeding and separation: the wet material to be processed enters the high-speed rotating spiral conveyor assembly 13 through the feed port 15. Under the action of strong centrifugal force, the denser solid particles are thrown towards the inner wall of the drum 11 to form a filter cake ring; the less dense liquid phase forms a liquid ring and is continuously discharged through the drain port (5).

[0040] Secondly, solid phase conveying: the spiral conveyor assembly 13 rotates in the same direction at a speed slightly lower or higher than that of the drum 11 (i.e., differential speed), and its spiral blades push the filter cake deposited on the inner wall of the drum 11 toward the cone section (dry zone) of the drum 11 and the discharge port 4.

[0041] Finally, the solid phase moisture content sensor 14 located at the outlet of the slag discharge port 4 continuously detects the moisture content of the discharged filter cake in real time and sends the data to the intelligent control system. At the same time, the torque sensor 10 installed on the drive system monitors the pushing torque of the positioning block 12 in real time, reflecting the adhesion and friction state of the filter cake in the machine, and sends the data to the intelligent control system.

[0042] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A spray-drying decanter centrifuge comprising a decanter centrifuge body (3), characterized in that: A sealed outer shell (2) is connected to the top of the decanter centrifuge body (3), and a feed funnel (1) is fixed above the sealed outer shell (2). A slag discharge port (4) and a liquid discharge port (5) are fixed below the decanter centrifuge body (3). A differential (6) is fixed on one side of the decanter centrifuge body (3), and a drum (11) is connected inside the decanter centrifuge body (3) at the output end of the differential (6). A spiral transmission assembly (13) is connected inside the drum (11), and a first bearing (9) is fixed on the outer side of the shaft of the spiral transmission assembly (13). A flow-retarding seat (7) is fixed above the drum (11), and a dry powder injection system is installed inside the flow-retarding seat (7). A feed inlet (15) is clamped on the other side of the decanter centrifuge body (3).

2. The powder spraying drying horizontal decanter centrifuge according to claim 1, characterized in that: The dry powder spraying system includes a flow-retarding plate (8), a flow-retarding groove (19), a flow-retarding protrusion (18), a through pipe (16), and a dry powder nozzle (17); A flow-slowing plate (8) is disposed on the inner wall of the flow-slowing seat (7), and the two are distributed in a cross pattern. The flow-slowing plate (8) has a flow-slowing groove (19) inside, and the flow-slowing groove (19) has flow-slowing protrusions (18) distributed inside. A through pipe (16) is fixed below the flow-slowing seat (7), and its interior is connected to the interior of the flow-slowing seat (7). Multiple sets of dry powder nozzles (17) are distributed below the flow-slowing seat (7).

3. The powder spraying drying horizontal decanter centrifuge according to claim 2, characterized in that: The cross-section of the slow-flow protrusion (18) is semi-circular, and it is arranged at equal intervals inside the slow-flow groove (19).

4. The powder spraying drying horizontal decanter centrifuge according to claim 2, characterized in that: The dry powder nozzle (17) is shaped like a trumpet, and a filter screen (20) is fixed below it. The filter screen (20) is adsorbed and connected to the dry powder nozzle (17) by a positioning block (12).

5. The powder spraying drying horizontal decanter centrifuge according to claim 4, characterized in that: The spiral blades of the spiral transmission assembly (13) are covered with a wear-resistant layer, which is made by spraying tungsten carbide alloy, embedding ceramic sheets, or overlaying high-hardness alloy.

6. The powder spraying drying horizontal decanter centrifuge according to claim 1, characterized in that: A torque sensor (10) is fixed on the outside of the differential (6) to detect the pushing resistance of the screw conveyor assembly (13). A solid phase moisture content sensor (14) is fixed at the outlet of the slag discharge port (4) below the main body (3) of the horizontal screw centrifuge to detect the dryness of the discharged material.

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