A stirring device for caustic recovery causticizing reaction convenient to clean

Abstract

The utility model relates to papermaking equipment technical field, concretely relates to a kind of alkali recovery causticization reaction stirring device convenient to clean, including rack, rack one end is equipped with top cover, top cover top is fixedly installed motor, motor output end passes through top cover and is fixedly connected with stirring shaft, top cover bottom is equipped with stirring drum, stirring shaft surface is equipped with cleaning mechanism, cleaning mechanism includes annular box, annular box is fixedly connected with two mounting plates, multiple installation slots are opened in mounting plate inner side, fixed box is fixedly connected in installation slot interior, multiple ultrasonic vibration son are fixedly connected in fixed box interior.The utility model is through mounting plate, fixed box and ultrasonic vibration son, stirring shaft drives ultrasonic vibration son rotation, ultrasonic vibration son makes it emit ultrasonic wave, makes solution and solid deposit vibration in stirring drum interior, makes solid deposit broken and loose, mounting plate and wedge strip stick to stirring drum inner wall rotation, the solid deposit that loosens is scraped down, reach the purpose of real-time cleaning solid deposit.

Description

Technical Field

[0001] This utility model relates to the field of papermaking equipment technology, and more specifically, to an alkali recovery and causticization reaction stirring device that is easy to clean. Background Technology

[0002] In the chemical pulping and papermaking process, large amounts of sodium hydroxide and sodium sulfide are added to cook the plant raw materials. The black liquor produced after cooking contains a large amount of organic matter dissolved from the raw materials and residual chemical alkali. Alkali recovery involves using a series of complex processes (evaporation and concentration, combustion, causticization, etc.) to burn off the organic matter to generate energy, while converting the residual sodium salts back into the alkali needed for cooking and recycling them for reuse. Sodium carbonate, which cannot be used directly for cooking, is converted into sodium hydroxide needed for cooking through the "causticization" of lime. At the same time, calcium carbonate precipitate is a byproduct. The causticization reaction is generally carried out in a stirring device.

[0003] The existing mixing device has the following problems during use: Firstly, the causticization reaction produces calcium carbonate precipitate, which easily adheres to the inner wall of the stirring device. The subsequent cleaning process often involves cleaning the solid deposit by acid washing or manual scraping. However, the solid deposit usually has to wait until the causticization reaction is over and the solid deposit has firmly adhered to the inner wall of the stirring device before it can be cleaned, which increases the difficulty of cleaning. In addition, the acid washing method generates other waste liquids, which need to be treated separately, increasing costs. The manual method increases the workload of the staff. Secondly, after the solid deposits adhering to the inner wall of the stirring device are cleaned off, large lumps of deposits are sometimes formed. These lumps of deposits usually settle at the bottom of the stirring device and are discharged from the slag discharge port. However, sometimes the lumps of deposits are large in size and can easily block the slag discharge port. In view of this, we propose a stirring device for alkali recovery causticization reaction that is easy to clean. Utility Model Content

[0004] This invention addresses the technical problems existing in the prior art by providing an easy-to-clean alkali recovery and causticization reaction stirring device to solve the problems of existing solutions.

[0005] To achieve the above objectives, this utility model provides an easy-to-clean alkali recovery causticization reaction stirring device, including a frame, a top cover installed at one end of the frame, a motor fixedly installed on the top of the top cover, a stirring shaft fixedly connected to the output end of the motor through the top cover, and a stirring cylinder installed at the bottom of the top cover. The stirring cylinder is fixedly connected to the frame. A cleaning mechanism for cleaning solid deposits on the inner wall of the stirring cylinder is provided on the surface of the stirring shaft. A holding mechanism for placing the cleaned-off blocky deposits is provided below the cleaning mechanism, wherein: The cleaning mechanism includes an annular box, the inner wall of which is fixedly connected to the center of the stirring shaft. Two mounting plates are fixedly connected to the annular box, and the two mounting plates are symmetrically arranged on both sides of the annular box. Multiple mounting grooves are opened on the inner side of the mounting plates, and a fixing box is fixedly connected inside the mounting groove. Multiple ultrasonic transducers are fixedly connected inside the fixing box. The outer side of the mounting plate is in contact with the center of the inner wall of the stirring drum.

[0006] The beneficial effects of this utility model are: 1) In this easy-to-clean alkali recovery causticization reaction stirring device, the stirring shaft rotates via a mounting plate, a fixed box, and an ultrasonic transducer, causing the fixed box and ultrasonic transducer to rotate continuously along a circular trajectory inside the stirring drum. Simultaneously, the ultrasonic transducer is activated to emit ultrasonic waves, causing the solution inside the stirring drum to vibrate, which in turn causes the solid deposits to vibrate, breaking and loosening them. Some of the solid deposits fall directly off the inner wall of the stirring drum. The mounting plate and wedge strip rotate along the inner wall of the stirring drum, scraping off the loose solid deposits. This facilitates the cleaning of solid deposits adhering to the inner wall of the stirring drum, achieving the purpose of real-time cleaning of solid deposits, avoiding the generation of other waste liquids during acid washing, reducing costs, and reducing the workload of staff.

[0007] 2) In this easy-to-clean alkali recovery causticization reaction stirring device, blocky or granular solid deposits sink under the action of gravity through the filter box and fall into the filter box. After the filter box is lifted away from the stirring drum by the stirring shaft and other structures, the screw is rotated by rotating the screw cap, so that the screw is separated from the connecting block. The connecting block and the filter box can then be removed from under the fixed block to clean the solid deposits in the filter box. This can minimize the blockage of the slag discharge port.

[0008] Based on the above technical solution, the present invention can be further improved as follows: As a further improvement to this technical solution, multiple protrusions are fixedly connected to the surface of the fixing box.

[0009] The beneficial effect of adopting the above-mentioned further solution is that when the ultrasonic transducer emits ultrasonic waves through the bump, it causes the fixed box to vibrate. The bump becomes a high-energy concentration area and a cavitation enhancement area, which can more efficiently transfer acoustic energy to the liquid. The number of cavitation bubbles and the intensity of their collapse near the bump will increase significantly, thereby greatly improving the cleaning efficiency.

[0010] As a further improvement to this technical solution, the mounting plate is fixedly connected to two wedge-shaped strips, which are symmetrically arranged on both sides of the mounting plate.

[0011] The beneficial effect of adopting the above-mentioned further solution is that, through the wedge strip, the stirring shaft rotates, which drives the annular box and the mounting plate to rotate, and in turn drives the fixed box and the wedge strip to rotate. During the rotation of the fixed box, the ultrasonic transducer emits ultrasonic waves, which break up the solids deposited on the inner wall of the stirring drum and loosen them. The wedge strip adheres to the inner wall of the stirring drum and continuously scrapes off the loose solid deposits on the inner wall of the stirring drum, thereby achieving the purpose of cleaning.

[0012] As a further improvement to this technical solution, the cleaning mechanism also includes a support ring, the outer wall of which is fixedly connected to the lower part of the inner wall of the mixing drum, an annular groove is provided on the top of the support ring, and a slider is fixedly connected to one end of the bottom of the mounting plate, the slider slidingly engaging with the annular groove.

[0013] The beneficial effect of adopting the above-mentioned further solution is that the shape of both ends of the slider is set as an inclined surface. The inclined surface can scoop up the solid deposits that fall into the annular groove, avoiding the accumulation of solid deposits in the annular groove and causing blockage. Through the support ring, the annular groove and the slider, the mounting plate rotates with the stirring shaft, so that the slider slides along the annular groove, improving the structural stability of the mounting plate when rotating.

[0014] As a further improvement to this technical solution, the holding mechanism includes two fixing blocks, the top ends of the two fixing blocks are respectively fixedly connected to the other ends of the bottom of the two mounting plates, the bottom of the fixing blocks are provided with slots, the slots are inserted with connecting blocks, and the bottoms of the two connecting blocks are fixedly connected with filter boxes.

[0015] The beneficial effect of adopting the above-mentioned further solution is that, through the filter box, the scraped solid deposits fall into the filter box and are not discharged from the outlet of the stirring drum along with the cleaning liquid, thus preventing the outlet of the stirring drum from becoming blocked.

[0016] As a further improvement to this technical solution, a screw is threadedly connected to one side of the fixing block, one end of the screw passes through the fixing block and the connecting block and contacts the slot, and a nut is fixedly connected to the other end of the screw.

[0017] The advantage of adopting the above-mentioned further solution is that by rotating the screw and the nut, the screw can be disengaged from the connecting block, and the filter box can be removed for cleaning and maintenance.

[0018] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2A schematic diagram showing the structure of the cleaning mechanism and the holding mechanism of this utility model lifting the container away from the mixing drum; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This utility model Figure 2 A magnified view of part A; Figure 5 This utility model Figure 3 A magnified view of part B.

[0020] The meanings of the labels in the diagram are as follows: 1. Frame; 2. Top cover; 3. Motor; 4. Stirring shaft; 5. Stirring drum; 6. Cleaning mechanism; 61. Annular box; 62. Mounting plate; 63. Mounting groove; 64. Fixing box; 65. Ultrasonic vibrator; 66. Protrusion; 67. Wedge strip; 68. Support ring; 69. Sliding block; 610. Annular groove; 7. Container mechanism; 71. Fixing block; 72. Slot; 73. Connecting block; 74. Filter box; 75. Screw; 76. Cap. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-5 As shown, this embodiment provides an easy-to-clean alkali recovery causticization reaction stirring device, including a frame 1, a top cover 2 installed at one end of the frame 1, a motor 3 fixedly installed on the top of the top cover 2, and the power cord and other wiring of the motor 3 buried inside the frame 1. The motor 3 is model RF77-195.24-Y5.5-4P. The output end of the motor 3 passes through the top cover 2 and is fixedly connected to a stirring shaft 4. A stirring cylinder 5 is installed at the bottom of the top cover 2 and is fixedly connected to the frame 1. The frame 1 includes a support and a cylinder, etc. The top cover 2 is installed on the support. The cylinder extends, causing the top cover 2, motor 3, and stirring shaft 4 to move out of the stirring cylinder 5. A cleaning mechanism 6 is provided on the surface of the stirring shaft 4 for cleaning solid deposits on the inner wall of the stirring cylinder 5. A holding mechanism 7 is provided below the cleaning mechanism 6 for placing the cleaned-off blocky deposits. The cleaning mechanism 6 includes an annular box 61, the inner wall of which is fixedly connected to the center of the stirring shaft 4. A conductive slip ring is installed at the connection between the stirring shaft 4 and the annular box 61, and the conductive slip ring is fixed to the inner wall of the stirring drum 5 by a bracket. Figure 3As shown, the connection method can be welding or bolting. The annular box 61 is fixedly connected to two mounting plates 62, which are symmetrically arranged on both sides of the annular box 61. Multiple mounting grooves 63 are opened on the inner side of the mounting plates 62. Fixing boxes 64 are fixedly connected inside the mounting grooves 63. Multiple ultrasonic transducers 65 are fixedly connected inside the fixing boxes 64. The mounting plates 62 have cavities inside. After the external power supply is electrically connected to the conductive slip ring, the output end of the conductive slip ring is connected to the wire. The wire is buried in the annular box 61 and the cavity and is electrically connected to the ultrasonic transducers 65 to supply power to the ultrasonic transducers 65. The ultrasonic generator and power supply accessories for the ultrasonic transducers 65 can be installed in the annular box 61. The relevant wiring can be buried inside the annular box 61 and the mounting plates 62. The ultrasonic transducers 65 are controlled to start and stop through the control center. The model of the ultrasonic transducers 65 is PLS-4QXHNQ-3840. The outer side of the mounting plate 62 is in contact with the center of the inner wall of the stirring cylinder 5.

[0023] Furthermore, multiple protrusions 66 are fixedly connected to the surface of the fixed box 64. When the ultrasonic transducer 65 emits ultrasonic waves through the protrusions 66, it causes the fixed box 64 to vibrate. The protrusions 66 become high-energy concentrated areas and cavitation enhancement areas, which can more efficiently transfer acoustic energy to the liquid. The number of cavitation bubbles and the intensity of their collapse near the protrusions 66 will increase significantly, thereby greatly improving the cleaning efficiency.

[0024] Furthermore, the mounting plate 62 is fixedly connected to two wedge-shaped strips 67, which are symmetrically arranged on both sides of the mounting plate 62. Through the wedge-shaped strips 67, such as... Figure 4 As shown, the stirring shaft 4 rotates, driving the annular box 61 and the mounting plate 62 to rotate, which in turn drives the fixed box 64 and the wedge strip 67 to rotate. During the rotation of the fixed box 64, the ultrasonic transducer 65 emits ultrasonic waves, breaking up the solids deposited on the inner wall of the stirring drum 5 and loosening them. The wedge strip 67 adheres to the inner wall of the stirring drum 5 and continuously scrapes off the loose solid deposits on the inner wall of the stirring drum 5, achieving the purpose of cleaning.

[0025] Furthermore, the cleaning mechanism 6 also includes a support ring 68. The outer wall of the support ring 68 is fixedly connected to the lower part of the inner wall of the mixing drum 5. An annular groove 610 is provided on the top of the support ring 68. A slider 69 is fixedly connected to one end of the bottom of the mounting plate 62. The slider 69 slides in cooperation with the annular groove 610. Both ends of the slider 69 are shaped as inclined surfaces. The inclined surfaces can scoop up solid deposits that fall into the annular groove 610, preventing solid deposits from accumulating in the annular groove 610 and causing blockage. Through the support ring 68, the annular groove 610 and the slider 69, the mounting plate 62 rotates with the mixing shaft 4, so that the slider 69 slides along the annular groove 610, improving the structural stability of the mounting plate 62 when rotating.

[0026] Furthermore, the holding mechanism 7 includes two fixing blocks 71, the tops of which are fixedly connected to the other ends of the bottoms of the two mounting plates 62 respectively. The bottom of the fixing blocks 71 has a slot 72, and a connecting block 73 is inserted into the slot 72. The bottoms of the two connecting blocks 73 are fixedly connected to a filter box 74. The filter box 74 is circular, and the outer wall of the filter box 74 coincides with the inner wall of the support ring 68. The filter box 74 and other structures are made of corrosion-resistant materials. Through the filter box 74, the scraped solids fall into the filter box 74 and are not discharged from the outlet of the stirring drum 5 along with the cleaning liquid, thus preventing the outlet of the stirring drum 5 from being blocked.

[0027] Furthermore, a screw 75 is threadedly connected to one side of the fixing block 71. One end of the screw 75 passes through the fixing block 71 and the connecting block 73 and contacts the slot 72. The other end of the screw 75 is fixedly connected to a nut 76. Through the screw 75 and the nut 76, such as Figure 5 As shown, rotating the screw cap 76 drives the screw 75 to rotate, causing the screw 75 to disengage from the connecting block 73, allowing the filter box 74 to be removed for cleaning and maintenance.

[0028] In summary, the working principle of this solution is as follows: When the stirring device is working, the motor 3 is started, and the motor 3 rotates, which drives the stirring shaft 4 to rotate to promote the causticization reaction. As the causticization reaction proceeds, calcium carbonate solid deposits are continuously produced and adhere to the inner wall of the stirring drum 5. When the stirring shaft 4 rotates, it drives the annular box 61 and the mounting plate 62 to rotate, which in turn drives the fixed box 64 and the ultrasonic transducer 65 to rotate continuously along the annular trajectory inside the stirring drum 5. At the same time, the ultrasonic transducer 65 is activated to emit ultrasonic waves, which causes the solution inside the stirring drum 5 to vibrate, thereby causing the solid deposits to vibrate, breaking and loosening the solid deposits. Some of the solid deposits fall directly off the inner wall of the stirring drum 5. The mounting plate 62 and the wedge strip 67 rotate along the inner wall of the stirring drum 5 to scrape off the loose solid deposits, thus facilitating the cleaning of the solid deposits attached to the inner wall of the stirring drum 5. After the solid deposits are cleaned off the inner wall of the mixing drum 5, the blocky or granular solid deposits sink under the action of gravity and fall into the filter box 74. After the filter box 74 is lifted away from the mixing drum 5 by the structure such as the stirring shaft 4, the rotating cap 76 drives the screw 75 to rotate, so that the screw 75 is separated from the connecting block 73. Then the connecting block 73 and the filter box 74 can be removed from under the fixing block 71 to clean the solid deposits in the filter box 74.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cleaning-friendly alkali recovery causticization reaction stirring device, comprising a frame (1), a top cover (2) installed at one end of the frame (1), a motor (3) fixedly installed on the top of the top cover (2), a stirring shaft (4) fixedly connected to the output end of the motor (3) through the top cover (2), and a stirring cylinder (5) installed at the bottom of the top cover (2), the stirring cylinder (5) being fixedly connected to the frame (1), characterized in that: The surface of the stirring shaft (4) is provided with a cleaning mechanism (6) for cleaning solid deposits on the inner wall of the stirring cylinder (5), and a holding mechanism (7) for placing the cleaned-off blocky deposits is provided below the cleaning mechanism (6), wherein: The cleaning mechanism (6) includes an annular box (61), the inner wall of which is fixedly connected to the center of the stirring shaft (4). The annular box (61) is fixedly connected to two mounting plates (62), which are symmetrically arranged on both sides of the annular box (61). Multiple mounting slots (63) are opened on the inner side of the mounting plates (62). A fixing box (64) is fixedly connected inside the mounting slots (63). Multiple ultrasonic transducers (65) are fixedly connected inside the fixing box (64). The outer side of the mounting plate (62) is in contact with the center of the inner wall of the stirring cylinder (5).

2. The easy-to-clean alkali recovery causticization reaction stirring device according to claim 1, characterized in that: The surface of the fixing box (64) is fixedly connected with multiple protrusions (66).

3. The easy-to-clean alkali recovery causticization reaction stirring device according to claim 1, characterized in that: The mounting plate (62) is fixedly connected to two wedge-shaped strips (67), and the two wedge-shaped strips (67) are symmetrically arranged on both sides of the mounting plate (62).

4. The easy-to-clean alkali recovery causticization reaction stirring device according to claim 1, characterized in that: The cleaning mechanism (6) also includes a support ring (68), the outer wall of which is fixedly connected to the lower part of the inner wall of the mixing drum (5), and an annular groove (610) is provided on the top of the support ring (68). A slider (69) is fixedly connected to one end of the bottom of the mounting plate (62), and the slider (69) slides in cooperation with the annular groove (610).

5. The easy-to-clean alkali recovery causticization reaction stirring device according to claim 1, characterized in that: The holding mechanism (7) includes two fixing blocks (71), the top of the two fixing blocks (71) are fixedly connected to the other end of the bottom of the two mounting plates (62), the bottom of the fixing blocks (71) is provided with a slot (72), a connecting block (73) is inserted into the slot (72), and a filter box (74) is fixedly connected to the bottom of the two connecting blocks (73).

6. The easy-to-clean alkali recovery causticization reaction stirring device according to claim 5, characterized in that: A screw (75) is threadedly connected to one side of the fixing block (71). One end of the screw (75) passes through the fixing block (71) and the connecting block (73) and contacts the slot (72). A nut (76) is fixedly connected to the other end of the screw (75).

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