Digestor for various calcium hydroxide

Abstract

The invention relates to the technical field of digestion engineering, and discloses a digester for various calcium hydroxide, which comprises a shell, the driving shaft is arranged in the shell; the deslagging assembly is arranged on the outer side of the driving shaft in a sleeving mode, and the deslagging assembly is located at one end of the interior of the shell; the reamer assembly is arranged on the outer side of the driving shaft in a sleeving manner; and the water sprinkling assembly is arranged right above the shell. Through the adjustable reamer, different digestion working condition requirements of high-activity ash and low-activity ash can be met at the same time, the production adaptability of the equipment to various products such as high-specific-surface-area calcium hydroxide and ash calcium is improved, through the deslagging assembly, under the action of the deslagging hopper, sediment slag can be cleaned in real time, the situation that the digestion space is occupied is avoided, and the production efficiency is improved. The production efficiency and the product quality stability are ensured, through the watering assembly, under the action of the dripping head and the spraying head, the spraying mode or the dripping mode can be switched according to different product requirements, and the low energy consumption and the high resource utilization rate in the production process are achieved.

Description

Technical Field

[0001] This invention relates to the field of digestive engineering technology, and more specifically, to a digester for various types of calcium hydroxide. Background Technology

[0002] Calcium hydroxide is an important inorganic chemical raw material, widely used in environmental desulfurization, building materials, metallurgy, food processing and chemical production. Industrially, it is usually necessary to prepare different varieties such as ordinary calcium hydroxide, high specific surface area calcium hydroxide and gray calcium. Since different varieties of calcium hydroxide have different requirements for digestion reaction conditions, existing production lines mostly adopt a dedicated configuration, that is, a set of digesters and its supporting equipment can only be used to produce a specific quality or type of calcium hydroxide.

[0003] Meanwhile, the cutters or reamers inside the digester are mostly designed with fixed structures and fixed angles, which makes them less adaptable to different digestion reaction conditions. They are unable to meet the high shear digestion requirements of high specific surface area calcium hydroxide and the long-term slow digestion requirements of ash calcium. Furthermore, they do not fully consider the problem of slag discharge during digestion, which reduces production efficiency and affects the stability of product quality. Moreover, they do not consider that the slag generated during digestion will occupy digestion space when it accumulates to a certain extent, affecting production capacity and quality.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0005] In view of the problems in the related technologies, the present invention proposes a digester for various types of calcium hydroxide to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by the present invention is as follows: A digester for various types of calcium hydroxide includes a shell; a drive shaft disposed inside the shell; a slag discharge assembly sleeved on the outside of the drive shaft, with the slag discharge assembly located at one end inside the shell; a reamer assembly sleeved on the outside of the drive shaft; and a water spraying assembly disposed directly above the shell.

[0007] Furthermore, in order to achieve automatic removal of residue, an inclined chute is provided at one end of the shell.

[0008] Furthermore, in order to meet the needs of different digestion conditions, the slag discharge assembly includes several connecting strips sleeved on the outside of the drive shaft, with a slag discharge hopper fixedly installed at one end of each connecting strip.

[0009] Furthermore, to meet the different digestion requirements of high-reactivity ash and low-reactivity ash, the reamer assembly includes an upper flange and a lower flange sleeved on the outside of the drive shaft, with a reamer seat disposed between the upper and lower flanges. The surface of the upper flange has several first mounting holes along a circular direction, and the surface of the lower flange has several second mounting holes along a circular direction; the first and second mounting holes are distributed at equal angular intervals on the upper and lower flanges. The reamer seat includes an adjusting block disposed on the outside of the drive shaft, the surface of which has several third mounting holes that mate with the first and second mounting holes; a reamer is disposed at the top of the adjusting block.

[0010] Furthermore, to enable switching between spray and drip modes for different product needs, the water spraying assembly includes a first water pipe positioned above the housing, a second water pipe positioned above the first water pipe, several support frames positioned between the first and second water pipes, and a connecting column positioned between the first water pipe and the housing. The first and second water pipes have Z-shaped cross-sections. Several spray heads are positioned below the first water pipe, and drip heads are positioned below the second water pipe.

[0011] Furthermore, in order to fix the second water pipe, the support frame includes a first half-ring symmetrically arranged above the first water pipe. The first half-rings are fixedly connected by a connecting plate. The top of the connecting plate is provided with a fixing strip, and the top of the fixing strip is provided with a second half-ring that cooperates with the second water pipe.

[0012] The beneficial effects of this invention are as follows: 1. Through the reamer assembly, the adjustable reamer can simultaneously meet the different digestion requirements of high-activity ash and low-activity ash, improving the equipment's adaptability to the production of various products such as high specific surface area calcium hydroxide and ash.

[0013] 2. Through the slag discharge component, the slag discharge hopper can clean up the settled slag in real time, avoiding the occupation of digestion space and ensuring the high efficiency of production and the stability of product quality.

[0014] 3. Through the water spraying components, the spraying or dripping modes can be switched according to different product needs under the action of dripping and spraying heads. Combined with the heat recovery circulation system, low energy consumption and high resource utilization can be achieved in the production process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a digester for various types of calcium hydroxide according to an embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the shell structure in a digester for various types of calcium hydroxide according to an embodiment of the present invention; Figure 4 yes Figure 3 A magnified view of a section at point B in the middle; Figure 5 This is a digester for various types of calcium hydroxide according to an embodiment of the present invention; Figure 6 This is a three-dimensional assembly schematic diagram of a reamer assembly in a digester for various types of calcium hydroxide according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the structure of a water spraying assembly in a digester for various types of calcium hydroxide according to an embodiment of the present invention; Figure 8 This is a partial cross-sectional view of a water spraying assembly in a digester for various types of calcium hydroxide according to an embodiment of the present invention; Figure 9 This is a schematic diagram illustrating a specific application of a digester for various types of calcium hydroxide according to an embodiment of the present invention.

[0017] In the picture: 1. Shell; 2. Drive shaft; 3. Slag discharge assembly; 301. Connecting strip; 302. Slag discharge hopper; 4. Reamer assembly; 401. Upper flange; 402. Lower flange; 403. Reamer seat; 404. First mounting hole; 405. Second mounting hole; 406. Adjusting block; 407. Third mounting hole; 408. Reamer; 5. Spraying assembly; 501. First water pipe; 502. Second water pipe; 503. Support frame; 5031. First half-ring; 5032. Connecting plate; 5033. Fixing strip; 5034. Second half-ring; 504. Spray head; 505. Drip head; 506. Connecting column; 6. Inclined chute; 7. Pre-digester; 8. Dust collector; 9. Scrubber; 10. Water replenishment tank; 11. Heating box; 12. Classifier; 13. Dryer; 14. Aging machine. Detailed Implementation

[0018] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0019] According to embodiments of the present invention, a digester for various types of calcium hydroxide is provided.

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-9 As shown, a digester for various types of calcium hydroxide according to an embodiment of the present invention includes a shell 1; a drive shaft 2 disposed inside the shell 1; a slag discharge assembly 3 sleeved on the outside of the drive shaft 2, with the slag discharge assembly 3 located at one end inside the shell 1; a reamer assembly 4 sleeved on the outside of the drive shaft 2; and a water spraying assembly 5 disposed directly above the shell 1. A sloping chute 6 is provided at one end of the shell 1.

[0021] In one embodiment, for the slag discharge assembly 3 and the reamer assembly 4, the slag discharge assembly 3 includes a plurality of connecting strips 301 sleeved on the outside of the drive shaft 2, and a slag discharge hopper 302 is fixedly provided at one end of each connecting strip 301. The reamer assembly 4 includes an upper flange 401 and a lower flange 402 sleeved on the outside of the drive shaft 2, and a reamer seat 403 is provided between the upper flange 401 and the lower flange 402. The surface of the upper flange 401 has a plurality of first mounting holes 404 along the circular direction, and the surface of the lower flange 402 has a plurality of second mounting holes 405 along the circular direction; the first mounting holes 404 and the second mounting holes 405 are distributed at equal angular intervals on the upper flange 401 and the lower flange 402. The reamer seat 403 includes an adjustment block 406 disposed on the outside of the drive shaft 2. The surface of the adjustment block 406 is provided with a plurality of third mounting holes 407 that cooperate with and connect with the first mounting hole 404 and the second mounting hole 405. A reamer 408 is provided at the top of the adjustment block 406 to meet the different digestion conditions of high-activity ash and low-activity ash.

[0022] It should be noted that the drive shaft 2 is driven by an externally connected motor, which is existing technology and will not be elaborated on here.

[0023] The working principle of the slag discharge assembly 3 and the reamer assembly 4 is as follows: First, different rotation speeds are selected according to the required quality of calcium hydroxide, as shown in Table 1: Table 1: Tachometer Pre-coating speed (revolutions / min) First-stage digestion speed (revolutions / min) Secondary digestion rotation speed (revolutions / min) Three-stage digestion speed (revolutions / min) Ordinary calcium hydroxide 40 30 20 15 High specific surface area calcium hydroxide 100 30 20 15 Gray calcium 25 20 18 15 Specifically, the staff pre-mixed calcium hydroxide into the pre-digester 7, and then drive the pre-digester 7 and drive shaft 2 to rotate via an external controller. When the calcium hydroxide, after being stirred by the pre-digester 7, falls into the shell 1, the reamer 408 continuously stirs and propels the calcium hydroxide under the rotation of the drive shaft 2. At the same time, the rotation of the drive shaft 2 drives the connecting bar 301 to rotate, which in turn drives the slag discharge hopper 302 to rotate. When the calcium hydroxide residue accumulates at the bottom of the shell 1, the rotating slag discharge hopper 302 continuously collects and scoops up the residue. When the slag discharge hopper 302 rotates to the top, under the action of gravity, the residue automatically falls onto the inclined chute 6 and flows into the next stage shell 1, ensuring the effective volume of the digestion space and avoiding the accumulation of slag that affects heat exchange and production capacity.

[0024] When it is necessary to adjust the angle of the reamer 408 to adapt to different digestion reaction conditions, the operator uses tools to remove the bolts fixing the reamer 408, thereby releasing the reamer 408 from the fixation. Then, the lower flange 402 is rotated to rotate the reamer 408 to the set angle. Finally, the bolts are passed through the first mounting hole 404, the second mounting hole 405, and the third mounting hole 407 to complete the fixation of the reamer 408.

[0025] In one embodiment, the sprinkler assembly 5 includes a first water pipe 501 disposed above the housing 1, a second water pipe 502 disposed above the first water pipe 501, a plurality of support frames 503 disposed between the first water pipe 501 and the second water pipe 502, and a connecting post 506 disposed between the first water pipe 501 and the housing 1. The cross-sections of the first water pipe 501 and the second water pipe 502 are Z-shaped. A plurality of spray heads 504 are disposed below the first water pipe 501, and a drip head 505 is disposed below the second water pipe 502. The support frame 503 includes a first semi-ring 5031 symmetrically disposed above the first water pipe 501, the first semi-rings 5031 being fixedly connected by a connecting plate 5032, a fixing strip 5033 being disposed at the top of the connecting plate 5032, and a second semi-ring 5034 cooperating with the second water pipe 502 being disposed at the top of the fixing strip 5033, thereby achieving low energy consumption and high resource utilization in the production process.

[0026] It should be noted that the first water pipe 501 and the second water pipe 502 are connected to an external water source and are supplied with water by a water pump. This is existing technology and will not be elaborated on here.

[0027] The working principle of the water spray component 5 is as follows: Different types of calcium hydroxide have different requirements for raw material quality, resulting in different water addition amounts and methods. It is necessary to ensure sufficient contact between the material and water within a reasonable timeframe to guarantee the uniformity of the reaction. (See Table 2.) Table 2: Water-to-Material Ratio Table project Use gray varieties Water addition ratio Digestion Moisture content of semi-finished products Ordinary calcium hydroxide Low impurities 0.4-0.6 dry method 1% High specific surface area calcium hydroxide High-purity, high-activity rotary kiln ash 0.6-0.7 Semi-dry method 10-20% Gray calcium High whiteness, stable activity, vertical kiln ash 0.5-0.6 dry method 1.5% For example, when producing high specific surface area calcium hydroxide, the staff sends a delivery signal to the external water source through an external controller, so that the first water pipe 501 and the second water pipe 502 supply water to the drip head 505 and / or the spray head 504, and accurately release the raw materials inside the shell 1, so that the materials can fully contact the water and thus ensure the uniformity of the reaction.

[0028] When producing ordinary calcium hydroxide and lime, the drip head 505 and spray head 504 are activated simultaneously to add an excessive amount of raw materials inside the shell 1, so as to avoid the formation of undigested and sluggish particles.

[0029] To facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process will be described in detail below.

[0030] In practical applications, depending on the target product to be produced, first adjust the angle of the reamer 408 (the working principle of the reamer assembly 4 is as described above), and adjust the rotational speed of the drive shaft 2 as shown in Table 1. Next, add the crushed raw material to the pre-digester 7 and add water to the water tank 10. Then, heat the water tank 10 to the required temperature through the heating box 11. When the water tank 10 reaches the preset stability, inject the hot water in the water tank 10 into the pre-digester 7, so that the material comes into initial contact with the water and releases some heat, starting the conversion reaction. Then, control the pre-digester 7 to transport the raw material into the shell 1 and start the drip head 505 and / or spray head. 504 (The working principle of the water spraying component 5 is as described above). Select the water spraying method according to the product to be produced, as shown in Table 2. When the product moves to the tail end in the shell 1, under the action of the drive shaft 2, the slag discharge hopper 302 continuously collects the residue remaining at the bottom of the shell 1 and falls into the next shell 1 for further digestion under the action of the inclined chute 6 (The working principle of the slag discharge component 3 is as described above). When the product falls into the last shell 1 for digestion, the dust-containing hot steam generated is sucked into the dust collector 8 for filtration. The filtered steam enters the scrubber 9 for water washing. The water vapor after water washing flows back to the water replenishment tank to achieve recycling.

[0031] The product digested in the last shell 1 enters the classifier for screening. The ordinary calcium hydroxide is screened at a mesh size of 200, the high specific surface area calcium hydroxide at a mesh size of 325, and the gray calcium at a mesh size between 325 and 500.

[0032] After screening, the products are processed using a dryer 13 or an aging machine 14 according to their characteristics. For example, high specific surface area calcium hydroxide has a high water content and needs to be dried. To ensure complete reaction, ash calcium needs to be aged to reduce the content of free calcium oxide. Ordinary calcium hydroxide is aged depending on the reaction conditions.

[0033] In summary, by utilizing the above-mentioned technical solutions of this invention, the reamer assembly 4, under the action of the adjustable reamer 408, can simultaneously meet the different digestion requirements of high-activity ash and low-activity ash, improving the equipment's adaptability to the production of various products such as high specific surface area calcium hydroxide and ash calcium. The slag discharge assembly 3, under the action of the slag discharge hopper 302, can clean the settled slag in real time, avoiding the occupation of digestion space and ensuring high production efficiency and stable product quality. The water spraying assembly 5 can switch between spraying or dripping modes according to different product requirements, and in conjunction with the heat recovery circulation system, achieves low energy consumption and high resource utilization in the production process.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A digester for various types of calcium hydroxide, characterized in that, include: Shell (1); The drive shaft (2) is disposed inside the housing (1); The slag discharge assembly (3) is sleeved on the outside of the drive shaft (2), and the slag discharge assembly (3) is located at one end inside the housing (1); The reamer assembly (4) is sleeved on the outside of the drive shaft (2); The water spraying assembly (5) is positioned directly above the housing (1).

2. The digester for various types of calcium hydroxide according to claim 1, characterized in that, One end of the housing (1) is provided with an inclined groove (6).

3. A digester for various types of calcium hydroxide according to claim 1, characterized in that, The slag discharge assembly (3) includes several connecting strips (301) sleeved on the outside of the drive shaft (2), and a slag discharge hopper (302) is fixedly provided at one end of the connecting strips (301).

4. A digester for various types of calcium hydroxide according to claim 1, characterized in that, The reamer assembly (4) includes an upper flange (401) and a lower flange (402) sleeved on the outside of the drive shaft (2), and a reamer seat (403) is provided between the upper flange (401) and the lower flange (402).

5. A digester for various types of calcium hydroxide according to claim 4, characterized in that, The surface of the upper flange (401) is provided with a plurality of first mounting holes (404) along the circular direction, and the surface of the lower flange (402) is provided with a plurality of second mounting holes (405) along the circular direction. The first mounting hole (404) and the second mounting hole (405) are distributed at equal angular intervals on the upper flange (401) and the lower flange (402).

6. A digester for various types of calcium hydroxide according to claim 5, characterized in that, The reamer holder (403) includes an adjustment block (406) disposed on the outside of the drive shaft (2). The surface of the adjustment block (406) is provided with a plurality of third mounting holes (407) that cooperate with and connect with the first mounting hole (404) and the second mounting hole (405). The top of the adjusting block (406) is provided with a reamer (408).

7. A digester for various types of calcium hydroxide according to claim 1, characterized in that, The water spraying assembly (5) includes a first water pipe (501) disposed above the housing (1), a second water pipe (502) disposed above the first water pipe (501), a plurality of support frames (503) disposed between the first water pipe (501) and the second water pipe (502), and a connecting column (506) disposed between the first water pipe (501) and the housing (1).

8. A digester for various types of calcium hydroxide according to claim 7, characterized in that, The cross-sections of the first water pipe (501) and the second water pipe (502) are Z-shaped.

9. A digester for various types of calcium hydroxide according to claim 8, characterized in that, A plurality of spray heads (504) are provided below the first water pipe (501), and a drip head (505) is provided below the second water pipe (502).

10. A digester for various types of calcium hydroxide according to claim 9, characterized in that, The support frame (503) includes a first half-ring (5031) symmetrically arranged above the first water pipe (501). The first half-rings (5031) are fixedly connected to each other by a connecting plate (5032). The top of the connecting plate (5032) is provided with a fixing strip (5033), and the top of the fixing strip (5033) is provided with a second half-ring (5034) that cooperates with the second water pipe (502).

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