Straw pulping black liquor alkali recovery evaporation crystallization equipment

Abstract

The utility model belongs to straw technical field, concretely relates to a kind of straw pulping black liquor alkali recovery evaporation crystallization equipment, including evaporation crystallization kettle, the center end of evaporation crystallization kettle is equipped with stirring motor, the bottom of evaporation crystallization kettle is equipped with discharge gate, three supports are welded around the discharge gate at equal intervals, the utility model, when using, two springs will push the one end of inner disc upward, so that inner disc can rotate in the inside of outer disc by the side lever of both sides. So the side of inner disc equipped with extension mouth will be turned down, at this moment, when black liquor alkali crystallization in evaporation crystallization kettle is discharged, it will fall on guide pad. Then black liquor alkali crystallization rolls to extension mouth along the inclination angle of inner disc and guide pad, at this moment, black liquor alkali crystallization recovery personnel only need to place the container prepared in advance at the bottom of extension mouth, can realize the function of automatic recovery black liquor alkali crystallization, to improve the convenience when evaporation crystallization kettle crystallization recovery is used.

Description

Technical Field

[0001] This utility model belongs to the field of straw technology, specifically relating to a straw pulping black liquor alkali recovery evaporation crystallization device. Background Technology

[0002] Straw pulping black liquor refers to the dark black waste liquor produced during the pulping process using straw (such as rice straw, wheat straw, corn stalks, etc.) as raw material and employing either the alkaline or sulfate process. In addition to organic components such as lignin and hemicellulose degradation products, this waste liquor also contains a large amount of alkaline substances, collectively referred to as straw pulping black liquor alkali.

[0003] Directly discharging the alkali from the black liquor of straw pulping into the natural environment would damage the surrounding ecosystem. Therefore, evaporation crystallization kettles are used to crystallize the black liquor, effectively removing the alkali. However, currently, the short distance between the outlet and the ground in evaporation crystallization kettles prevents direct discharge for recycling. This necessitates the construction of specialized pipeline discharge systems, further complicating the recycling process. Utility Model Content

[0004] The purpose of this invention is to provide an evaporation and crystallization device for recovering alkali from straw pulping black liquor. This addresses the problem that directly discharging alkali from straw pulping black liquor into the natural environment can damage the surrounding ecosystem. Therefore, evaporation and crystallization kettles are used to crystallize the straw pulping black liquor, effectively removing the alkali. However, currently, the small distance between the discharge port and the ground in evaporation and crystallization kettles prevents direct discharge for recovery. This necessitates the construction of a dedicated pipeline discharge system, further complicating the recovery process.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a straw pulping black liquor alkali recovery evaporation and crystallization device, including an evaporation and crystallization kettle, a stirring motor installed at the center end of the evaporation and crystallization kettle, a discharge port installed at the bottom of the evaporation and crystallization kettle, and three supports welded at equal intervals around the discharge port, with the top of the supports welded to the bottom of the evaporation and crystallization kettle;

[0006] An outer plate is installed between the three brackets, and an inner plate is movably installed inside the outer plate. The diameter of the inner plate is smaller than the inner diameter of the outer plate. A guide pad is adhered to the inner wall of the inner plate. The diameter of the guide pad is adapted to the inner diameter of the inner plate. The surface of the guide pad has a beveled structure.

[0007] In order to ensure that the black liquor alkali crystals in the evaporation crystallization kettle can fall accurately into the guide pad during subsequent recovery, as a straw pulping black liquor alkali recovery evaporation crystallization device of this utility model, preferably, the center end of the guide pad is located at the bottom of the discharge port, and the lower end of the guide pad is located at the opening on one side of the inner plate.

[0008] In order to allow the inner disc to rotate inside the outer disc, thereby allowing the inner disc to tilt to one side, in the present invention, a side rod is preferably fixedly installed on the inner wall on both sides of the horizontal midline of the inner disc, and the other end of the side rod is movably inserted into the inner wall of the outer disc.

[0009] An extension opening is attached to the opening on one side of the inner disk, and the other end of the extension opening extends into a rectangular opening. The rectangular opening is located on one side of the outer wall of the outer disk and connects the inner and outer sides of the outer disk.

[0010] In order to ensure that the maximum upward height of the inner plate can be constrained by the L-shaped plate, as a straw pulping black liquor alkali recovery evaporation crystallization device of this utility model, preferably, three recesses are evenly opened on the outer wall of the outer plate, and each recess is connected to a corresponding bracket.

[0011] One of the recesses has an L-shaped plate on one side of its top, the bottom of which is welded to the surface of the outer disk, and the lateral end of which is located above one side of the inner disk.

[0012] In order for the spring to be able to push one end of the inner disk upward in its normal state, as a straw pulping black liquor alkali recovery evaporation crystallization device of this utility model, preferably, the bottom of the end of the inner disk away from the extension port is connected to the top of the two springs, and the bottom of the two springs is connected to the inner wall of the outer disk.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] During operation, two springs push one end of the inner disc upwards, allowing it to rotate inside the outer disc via side rods. This causes the side of the inner disc with the extension opening to flip downwards. As the black liquor alkali crystals are discharged from the evaporation crystallizer, they fall onto the guide pad. The crystals then roll towards the extension opening along the inclined angle of the inner disc and guide pad. The personnel responsible for black liquor alkali crystal recovery simply place a pre-prepared container at the bottom of the extension opening to automatically recover the crystals, thus improving the convenience of crystal recovery during use. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall assembly structure provided for an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the outer disk provided in an embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the structure provided in this application embodiment, showing the inner disc remaining horizontally inside the outer disc when the spring is compressed.

[0019] Figure 4 This is a schematic diagram of the extension port distribution structure provided in an embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the guide pad structure provided in an embodiment of this application.

[0021] In the diagram: 1. Evaporation crystallization kettle; 2. Stirring motor; 3. Discharge port; 4. Support; 5. Outer plate; 51. L-shaped plate; 52. Notch; 53. Rectangular opening; 6. Inner plate; 61. Side rod; 62. Extension port; 63. Spring; 7. Guide pad. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-5 The present invention provides the following technical solution: a straw pulping black liquor alkali recovery evaporation crystallization equipment, including an evaporation crystallization kettle 1, a stirring motor 2 installed at the center end of the evaporation crystallization kettle 1, a discharge port 3 installed at the bottom of the evaporation crystallization kettle 1, and three supports 4 welded at equal intervals around the discharge port 3, with the top of the supports 4 welded to the bottom of the evaporation crystallization kettle 1.

[0024] When in use, the black liquor containing alkali produced during straw pulping is guided into the interior of the evaporation crystallization kettle 1. The black liquor can be transported into the evaporation crystallization kettle 1 by pipeline or added manually. The specific implementation can be adjusted according to the actual operation.

[0025] Next, the evaporation crystallization kettle 1 is started. At this time, under the action of the stirring motor 2, the alkali in the straw pulping black liquor inside the evaporation crystallization kettle 1 will slowly crystallize. After the evaporation crystallization kettle 1 has finished processing, the discharge port 3 is opened, and the alkali crystals in the evaporation crystallization kettle 1 will be discharged from the discharge port 3. In this way, the function of recovering alkali crystals from straw pulping black liquor is completed.

[0026] An outer plate 5 is installed between the three brackets 4. An inner plate 6 is movably installed inside the outer plate 5. The diameter of the inner plate 6 is smaller than the inner diameter of the outer plate 5. A guide pad 7 is adhered to the inner wall of the inner plate 6. The diameter of the guide pad 7 is matched with the inner diameter of the inner plate 6. The surface of the guide pad 7 has a beveled structure.

[0027] Preferably, the center end of the guide pad 7 is located at the bottom of the discharge port 3, and the lower end of the guide pad 7 is located at the opening on one side of the inner plate 6.

[0028] In practical use, when the alkali crystals in the black liquor of straw pulping are discharged from the discharge port 3, the alkali crystals will roll along the opening on the side of the guide pad 7 facing the inner plate 6, which facilitates the subsequent recycling operation of receiving alkali crystals.

[0029] Preferably, a side rod 61 is fixedly installed on the inner walls on both sides of the transverse center line of the inner disk 6, and the other end of the side rod 61 is movably inserted into the inner wall of the outer disk 5;

[0030] An extension opening 62 is attached to the opening on one side of the inner plate 6. The other end of the extension opening 62 extends into the rectangular opening 53. The rectangular opening 53 is opened on one side of the outer wall of the outer plate 5 and connects the inner and outer sides of the outer plate 5.

[0031] In practical use, the discharge channel constructed between the extension port 62 and the rectangular port 53 ensures that when alkali crystals flow through the extension port 62, no alkali crystals will fall into the area outside the inner plate 6, thereby improving the recovery efficiency.

[0032] Preferably, the outer plate 5 has three equally spaced notches 52 on its outer wall, and each notch 52 is connected to a corresponding bracket 4. After the notch 52 is connected to the bracket 4, the outer plate 5 can be fixed to the bracket 4 by welding or bolts.

[0033] One of the notches 52 has an L-shaped plate 51 on one side of its top end. The bottom of the L-shaped plate 51 is welded to the surface of the outer plate 5, and the lateral end of the L-shaped plate 51 is located above one side surface of the inner plate 6.

[0034] Preferably, the bottom of the inner disc 6 at the end away from the extension port 62 is connected to the top of the two springs 63, and the bottom of the two springs 63 is connected to the inner wall of the outer disc 5.

[0035] During use, the two springs 63 push one end of the inner plate 6 upwards, allowing the inner plate 6 to rotate inside the outer plate 5 via the side rods 61 on both sides, thus tilting the inner plate 6. When one end of the inner plate 6 reaches its highest point, the bottom of the L-shaped plate 51 restricts the inner plate 6, keeping it in its current position.

[0036] With the inner plate 6 having the extension port 62 facing downwards, the black liquor alkali crystals in the evaporation crystallizer 1 will fall onto the guide pad 7 after being discharged from the outlet 3. The guide pad 7 is made of rubber, which reduces the impact force when the black liquor alkali crystals fall, thereby improving the stability of the black liquor alkali crystals after falling onto the guide pad 7.

[0037] Then the black liquor alkali crystals roll along the inclined angle of the inner plate 6 and the guide pad 7 towards the extension port 62. At this time, the black liquor alkali crystal recovery personnel only need to place the pre-prepared container at the bottom of the extension port 62 to realize the function of automatically recovering the black liquor alkali crystals, thereby improving the convenience of using the evaporation crystallizer 1.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A straw pulping black liquor alkali recovery evaporation crystallization device, comprising an evaporation crystallization kettle (1), characterized in that, A stirring motor (2) is installed at the center end of the evaporation crystallization kettle (1), and a discharge port (3) is installed at the bottom of the evaporation crystallization kettle (1). Three supports (4) are welded at equal intervals around the discharge port (3), and the top of the supports (4) is welded to the bottom of the evaporation crystallization kettle (1). An outer plate (5) is installed between the three brackets (4). An inner plate (6) is movably installed inside the outer plate (5). The diameter of the inner plate (6) is smaller than the inner diameter of the outer plate (5). A guide pad (7) is adhered to the inner wall of the inner plate (6). The diameter of the guide pad (7) is adapted to the inner diameter of the inner plate (6). The surface of the guide pad (7) is a beveled structure.

2. The straw pulping black liquor alkali recovery evaporation crystallization equipment according to claim 1, characterized in that: The center end of the guide pad (7) is located at the bottom of the discharge port (3), and the lower end of the guide pad (7) is located at the opening on one side of the inner plate (6).

3. The straw pulping black liquor alkali recovery evaporation crystallization equipment according to claim 1, characterized in that: A side rod (61) is fixedly installed on the inner walls on both sides of the transverse midline of the inner disc (6), and the other end of the side rod (61) is movably inserted into the inner wall of the outer disc (5).

4. The straw pulping black liquor alkali recovery evaporation crystallization equipment according to claim 1, characterized in that: An extension opening (62) is attached to the opening on one side of the inner disk (6). The other end of the extension opening (62) extends into the rectangular opening (53). The rectangular opening (53) is opened on one side of the outer wall of the outer disk (5) and connects the inner and outer sides of the outer disk (5).

5. The straw pulping black liquor alkali recovery evaporation crystallization equipment according to claim 1, characterized in that: The outer wall of the outer plate (5) has three equally spaced notches (52), and each notch (52) is connected to a corresponding bracket (4).

6. The straw pulping black liquor alkali recovery evaporation crystallization equipment according to claim 5, characterized in that: One of the notches (52) has an L-shaped plate (51) on one side of its top end. The bottom of the L-shaped plate (51) is welded to the surface of the outer disk (5), and the lateral end of the L-shaped plate (51) is located above one side surface of the inner disk (6).

7. The straw pulping black liquor alkali recovery evaporation crystallization equipment according to claim 1, characterized in that: The bottom of the inner disc (6) away from the extension port (62) is connected to the top of the two springs (63), and the bottom of the two springs (63) is connected to the inner wall of the outer disc (5).

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