Lime melting machine

Abstract

The utility model provides a lime slaking machine which comprises a lime inlet, a water inlet, a cylinder body, a motor, a propelling shoveling plate and a fixed cover, the lime inlet and the water inlet are arranged at the front end of the cylinder body, the motor, a rolling ring and a tug device are arranged on the outer side of the cylinder body, the propelling shoveling plate is arranged on the inner side of the cylinder body, the fixed cover is arranged at the rear end of the cylinder body, and the fixed cover comprises a circular rotary screen, a discharge port and a steam exhaust chimney. A steam exhaust chimney is arranged on the upper portion of the fixed cover, a discharging port is formed in the lower portion of the fixed cover, a circular rotary screen is arranged in the fixed cover and comprises an inner rotary screen body and an outer rotary screen body arranged outside the inner rotary screen body, and the outer rotary screen body comprises a first-stage rotary screen body close to the rear end of the barrel and a second-stage rotary screen body connected with the first-stage rotary screen body. Screen holes of the rotary screen are different in diameter, the outer hole diameter is larger than the inner hole diameter, blocking can be effectively prevented, the round rotary screen used by the lime slaking machine is of a two-layer three-level structure, lime milk good in dispersity can be extracted, grading treatment of solid particles is achieved, and the effect of saving energy is achieved while the raw material conversion rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of soda ash production, and more specifically, mainly relates to a ash disintegrating machine. Background Art

[0002] A lime slaker, also known as a lime slaker or quicklime slaker, is a specialized device that converts quicklime (calcium oxide) into lime milk. It is primarily used in soda ash production, steelmaking, chemicals, metallurgy, papermaking, and biopharmaceuticals. The soda ash production process consumes a large amount of lime milk, making the production of lime milk from quicklime slaker an essential step in the process.

[0003] In the prior art, a ash disintegrator primarily consists of a feed end, a cylinder, a power unit, a screening device, and a discharge end. The screening devices for ash disintegrators are primarily single-layer and double-layer rotary screens. During the ash disintegration process, solid impurities remaining after burning and unburned lime particles may be present. Therefore, a single-layer rotary screen can cause slag leakage, which in turn results in a high slag content in the lime milk discharged from the ash disintegrator outlet and causes clogging of the rotary screen filter. For example, utility model patent CN207221455U discloses a double-layer filter device for the discharge end of a ash disintegrator. While this device can separate the lime milk from solid impurities remaining after burning and unburned lime particles, reducing the slag content in the lime milk, it cannot recycle the unburned lime particles. Furthermore, the ash disintegrator releases a large amount of reaction heat during the digestion reaction of quicklime and water, and produces a large amount of dust during the production process, which pollutes the environment and affects the health of workers. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the present invention discloses a lime disintegrating machine to address the above-mentioned problems. The present invention utilizes a two-layer, three-stage rotary screen to extract lime milk with good dispersion and simultaneously achieves graded processing of solid particles, thereby improving the raw material conversion rate while saving energy. A spray device is also provided to recover ash powder and steam latent heat, preventing pollution to the factory building. It also achieves heat utilization, and the generated hot water can be recycled and reused.

[0005] In order to achieve the above technical objectives, the utility model proposes a lime disintegrating machine, including a lime inlet, a water inlet, a cylinder, a motor, a propulsion shovel, and a fixed cover. The front end of the cylinder is provided with a lime inlet and a water inlet, the outside of the cylinder is provided with a motor, a roller and a tugboat device, the inside of the cylinder is provided with a propulsion shovel, the rear end of the cylinder is provided with a fixed cover, the fixed cover includes a circular rotary screen, a discharge port and an exhaust chimney, the upper part of the fixed cover is provided with an exhaust chimney, the lower part of the fixed cover is provided with a discharge port, the inside of the fixed cover is provided with a circular rotary screen, the circular rotary screen includes an inner rotary screen and an outer rotary screen arranged outside the inner rotary screen, the outer rotary screen includes a first-level rotary screen close to the rear end of the cylinder and a second-level rotary screen connected to the first-level rotary screen.

[0006] Furthermore, the inner diameter of the first-stage rotary screen is 5mm-15mm, the inner diameter of the second-stage rotary screen is 30mm-50mm, the inner diameter of the inner rotary screen is 16mm-29mm, and the outer diameter of the screen is greater than or equal to the inner diameter.

[0007] For example, the first-stage rotary screen 71 has an inner pore diameter of 10 mm and an outer pore diameter of 12 mm, the second-stage rotary screen 72 has an inner pore diameter of 40 mm and an outer pore diameter of 48 mm, and the inner rotary screen 8 has an inner pore diameter of 20 mm and an outer pore diameter of 24 mm.

[0008] For example, the first-stage rotary screen 71 has an inner pore diameter of 5 mm and an outer pore diameter of 6 mm, the second-stage rotary screen 72 has an inner pore diameter of 30 mm and an outer pore diameter of 36 mm, and the inner rotary screen 8 has an inner pore diameter of 16 mm and an outer pore diameter of 19 mm.

[0009] For example, the first-stage rotary screen 71 has an inner pore diameter of 15 mm and an outer pore diameter of 18 mm, the second-stage rotary screen 72 has an inner pore diameter of 50 mm and an outer pore diameter of 60 mm, and the inner rotary screen 8 has an inner pore diameter of 29 mm and an outer pore diameter of 35 mm.

[0010] Furthermore, the circular rotary screen is provided with uniform mesh holes of varying diameters, with an outer aperture of bmm and an inner aperture of amm, where b = (1.05-1.3)*a. Typically, the openings of the rotary screen in a ash disintegrator are prone to clogging by solid particles. However, the present invention employs a method of providing a rotary screen with varying mesh holes. The rotary screen has a certain thickness, and the outer aperture is larger than the inner aperture, effectively preventing clogging. After solid particles pass through the inner aperture, the larger aperture allows them to pass more smoothly, reducing the likelihood of clogging and blockage.

[0011] Furthermore, a spiral belt is provided inside the secondary rotary screen, and a flat steel block is provided on the spiral belt. The spiral belt can push the solid to move backward more efficiently. The provision of the flat steel block can improve the material conveying effect, make the material conveying more uniform and stable, and reduce blockage and accumulation. The friction between the flat steel block and the material is relatively large, which helps to better push or pull the material to move along the spiral belt.

[0012] Furthermore, the discharge port includes a lime milk outlet, a waste rock outlet, and a return rock outlet. The lime milk outlet is set at the lower end of the first rotary screen, the waste rock outlet is set at the lower end of the second rotary screen, and the return rock outlet is set at the rear end of the inner rotary screen. The solid-liquid mixed slurry rotates with the cylinder to the circular rotary screen. Particles with smaller particle sizes and lime milk slurry can pass through the inner rotary screen and reach the outer rotary screen, where the lime milk is first screened out from the first rotary screen and flows out from the lime milk outlet. At this time, the screened lime milk has a lower solid content and higher dispersion, which can provide more active Ca(OH)2 more quickly, thereby increasing the reaction rate of the lime milk used in the subsequent ammonia distillation pre-ash barrel; particles with smaller particle sizes are screened out from the second rotary screen and fall directly from the waste rock outlet. The aperture of the second rotary screen is larger than that of the inner rotary screen, so stone jamming is less likely to occur here. Smaller particles are mostly solid impurities remaining after incineration, with the main component being SiO2 and the like, and are not worth incinerating again. Larger particles cannot pass through the inner rotating screen and rotate with the inner rotating screen to the top of the return stone outlet. They fall from the return stone outlet. Most of them are unburned lime particles, which are returned to the lime kiln for re-burning to improve the utilization rate of limestone.

[0013] Furthermore, a spray device is installed within the exhaust chimney to recover ash and steam latent heat, preventing pollution to the plant while also utilizing heat and recycling the generated hot water. The spray device includes several spray pipe inlets and hot water outlets. These inlets are located at different heights within the exhaust chimney, improving spray uniformity, ensuring spray density, and increasing ash recovery efficiency. The hot water outlet is located below the spray pipe inlet.

[0014] Furthermore, a washing water pipe is provided on the upper side of the outer rotary screen, and a washing water pipe is provided on the inner side of the inner rotary screen, for regularly flushing the clogged rotary screen holes.

[0015] Furthermore, a conical channel is set inside the lime inlet to prevent lime powder from returning to pollute the factory building. The propulsion plates in the cylinder are distributed in a stepped horizontal spiral, which pushes the lime and ash water to move to the rear end while turning the lime and ash water over to produce a better mixing effect.

[0016] Furthermore, the rolling ring is in direct contact with the tugboat device, and the number of tugboat devices is 2 or 3, which are located at the bottom of the ash dissolving machine. The rolling ring is fixed to the cylinder by countersunk screws, and the countersunk screw holes on the inside of the cylinder are plug-welded. The plug-welding treatment of the countersunk screw holes can eliminate the leakage of ash emulsion in the cylinder.

[0017] Furthermore, the material of the circular rotary screen is one of stainless steel, duplex steel, and fiberglass; the material of the cylinder is one of stainless steel and carbon steel; the material of the rolling ring is casting, which includes cast steel, etc. Wear-resistant casting can maintain good performance in long-term friction and wear environment, reduce component failure and replacement due to wear, and cast steel is preferred.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) The lime disintegrator uses a two-layer three-stage rotary screen to extract lime milk with good dispersion and realize the graded treatment of solid particles, which improves the raw material conversion rate and saves energy.

[0020] (2) The sieve holes of the ash machine are of different diameters. The outer pore diameter is larger than the inner pore diameter, which can effectively prevent clogging. After the solid particles pass through the inner pore diameter, the particles pass through more smoothly due to the increase in pore diameter, reducing the probability of stuck and blocked holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 This is a main diagram of the ash disintegrating machine according to an embodiment of the present utility model;

[0023] Figure 2 A partial side view of an ash dissolving machine according to an embodiment of the present invention;

[0024] Figure 3 This is a diagram of different diameter holes of the ash machine rotary screen according to an embodiment of the utility model.

[0025] The above drawings include the following reference numerals:

[0026] 1. Lime inlet; 2. Cylinder; 3. Pusher plate; 4. Wash water pipe; 5. Exhaust chimney; 6. Hot water outlet; 7. External rotary screen; 8. Internal rotary screen; 9. Water inlet; 10. Motor; 11. Lime milk outlet; 12. Waste rock outlet; 13. Return rock outlet; 14. Spray pipe inlet; 15. Fixed cover; 16. Spiral belt; 17. Roller ring; 18. Tugboat device; 71. First-stage rotary screen; 72. Second-stage rotary screen. DETAILED DESCRIPTION

[0027] To facilitate understanding of the present invention, the present invention will be described in more detail below, with preferred embodiments of the present invention provided. However, it should be understood that the embodiments are merely for the purpose of further explanation and should not be construed as limiting the present invention in any form, i.e., they are not intended to limit the scope of protection of the present invention.

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Example 1:

[0030] A lime disintegrating machine includes a lime inlet 1, a water inlet 9, a cylinder 2, a motor 10, a propulsion shovel 3, and a fixed cover 15. The cylinder 2 is made of either stainless steel or carbon steel. The lime inlet 1 and water inlet 9 are located at the front end of the cylinder 2. The motor 10, a roller 17, and a puller device 18 are located outside the cylinder 2. The propulsion shovel 3 is located inside the cylinder 2. The fixed cover 15 is located at the rear end of the cylinder 2. The fixed cover 15 includes a circular rotary screen, a discharge port, and an exhaust chimney 5. The exhaust chimney 5 is located at the top of the fixed cover 15, and the discharge port is located at the bottom of the fixed cover 15. The fixed cover 15 is located inside the fixed cover 15. The circular rotary screen includes an inner rotary screen 8 and an outer rotary screen 7 disposed outside the inner rotary screen 8. The outer rotary screen 7 includes a primary rotary screen 71 near the rear end of the cylinder 2 and a secondary rotary screen 72 connected to the primary rotary screen 71. The lime disintegrating machine uses two layers of three-stage rotary screens to extract lime milk with good dispersion and simultaneously achieves graded processing of solid particles, thereby improving the raw material conversion rate while saving energy.

[0031] Example 2:

[0032] A preferred embodiment of the present utility model: On the basis of Example 1, the circular rotary screen is provided with uniform sieve holes, and the sieve holes are different diameter holes. The inner pore diameter of the first-stage rotary screen 71 is 10 mm, and the outer pore diameter is 12 mm. The inner pore diameter of the second-stage rotary screen 72 is 40 mm, and the outer pore diameter is 48 mm. The inner pore diameter of the inner rotary screen 8 is 20 mm, and the outer pore diameter is 24 mm. Or the inner pore diameter of the first-stage rotary screen 71 is 5 mm, and the outer pore diameter is 6 mm. The inner pore diameter of the second-stage rotary screen 72 is 30 mm, and the outer pore diameter is 36 mm. The inner pore diameter of the inner rotary screen 8 is 16 mm, and the outer pore diameter is 19 mm. Or the inner pore diameter of the first-stage rotary screen 71 is 15 mm, and the outer pore diameter is 18 mm. The inner pore diameter of the second-stage rotary screen 72 is 50 mm, and the outer pore diameter is 60 mm. The inner pore diameter of the inner rotary screen 8 is 29 mm, and the outer pore diameter is 35 mm. The above aperture sizes are for better screening effects achieved in combination with specific working conditions. Other values ​​within the aperture size range can also be set in combination with specific working conditions.

[0033] The ash dissolving machine described in this utility model is applied to the 60,000-ton / year soda ash expansion project and can operate continuously and stably for 8,000 hours, meeting the continuous production requirements of soda ash with a low failure rate. The lime milk produced by this ash dissolving machine has a high dispersion, a fast reaction rate in the downstream reaction tank, a low solid content in the lime milk, and a small solid particle size, reducing the risk of downstream pipeline and equipment blockage and extending the operating cycle of the downstream ammonia distillation tower from 3 months to 1 year. The multi-stage rotary screen and the configuration of waste rock and return rock can separate return rock from waste rock, saving calcination energy and improving limestone utilization.

[0034] Example 3:

[0035] A preferred embodiment of the present utility model: On the basis of embodiment 1, a spiral belt is provided inside the secondary rotary screen 72, and the spiral belt 16 is fixed by evenly distributed flat steel blocks. The spiral belt 16 can more efficiently push the solid to move backward. The provision of flat steel blocks can improve the material conveying effect, make the material conveying more uniform and stable, reduce blockage and accumulation, and the friction between the flat steel blocks and the material is relatively large, which helps to better push or pull the material to move along the spiral belt.

[0036] Example 4:

[0037] A preferred embodiment of the present utility model: Based on Example 1, the discharge port is preferably set as a lime milk outlet 11, a waste rock outlet 12 and a return rock outlet 13, the lime milk outlet 11 is set at the lower end of the first rotary screen 71, the waste rock outlet 12 is set at the lower end of the second rotary screen 72, and the return rock outlet 13 is set at the rear end of the inner rotary screen 8. The solid-liquid mixed slurry rotates with the cylinder to the circular rotary screen. Particles with smaller particle size and lime milk slurry can pass through the inner rotary screen 8 and reach the outer rotary screen 7, where the lime milk is first screened out from the first-stage rotary screen 71 and flows out from the lime milk outlet 11. At this time, the screened lime milk has less solid content and higher dispersion, which can provide more active Ca(OH)2 more quickly, thereby improving the reaction rate of lime milk used in the subsequent ammonia distillation pre-ash barrel; particles with smaller particle size are screened out from the second-stage rotary screen 72 and fall directly from the waste rock outlet 12. Smaller particles are mostly solid impurities remaining after burning, with the main component being SiO2 and the like, and have no value for re-burning; larger particles cannot pass through the inner rotary screen 8, and rotate with the inner rotary screen 8 to above the return rock outlet 13, falling from the return rock outlet 13. Most of them are lime particles that have not been completely burned, and they are returned to the lime kiln for re-burning, thereby improving the utilization rate of limestone.

[0038] Example 5:

[0039] A preferred embodiment of the present invention, based on Example 1, incorporates a spray device within the exhaust chimney 5. The spray device comprises several spray pipe inlets 14 and a hot water outlet 6. These spray pipe inlets 14 are positioned at different heights within the exhaust chimney 5, improving spray uniformity, ensuring spray density, and increasing the efficiency of dust recovery. The spray device recovers the latent heat of the dust and steam, preventing contamination of the plant. It also utilizes heat, and the generated hot water can be recycled and reused.

[0040] Example 6:

[0041] A preferred embodiment of the present utility model: Based on embodiment 1, a washing pipe 4 is provided at the upper end of the outer rotating screen 7 and the inside of the inner rotating screen 8. The washing pipe 4 takes in water from the end of the fixed cover 15 and is used to regularly flush the blocked rotating screen holes.

[0042] Example 7:

[0043] A preferred embodiment of the present utility model is as follows: Based on embodiment 1, a conical channel is provided in the lime inlet 1, which prevents lime powder from returning to pollute the factory building. The propulsion plates in the cylinder 2 are distributed in a stepped and progressive horizontal spiral, which pushes the lime and the ash water to move toward the rear end while turning the lime and the ash water over to produce a better mixing effect.

[0044] During the use of a ash disintegrating machine in a certain project, a conical channel was not initially set at the lime inlet of the ash disintegrating machine. The burned limestone entered the ash disintegrating machine from the lime silo through the lime feeder. A large amount of dust was generated during the falling of the lime and sprayed out from the lime inlet. The dust was diffused near the ash disintegrating machine inlet, polluting the factory building, which was not conducive to workers' operation and inspection, and also caused a waste of lime raw materials. In order to solve the above problems, a conical channel was optimized and set. The inlet channel gradually narrowed, and most of the dust generated by the falling lime was blocked by the conical channel and could not be sprayed out from the inlet, solving the problem of polluting the factory building and saving lime raw materials.

[0045] Example 8:

[0046] A preferred embodiment of the present utility model: Based on Example 1, the rolling ring 17 is in direct contact with the tug device 18, the number of the tug devices 18 is 2 or 3, and is located at the bottom of the ash machine. The rolling ring 17 is fixed to the cylinder 2 by a countersunk screw, and the countersunk screw hole on the inner side of the cylinder 2 is plug-welded.

[0047] During the use of a ash disintegrator on a certain project, the initial design had the roller 17 fixed to the cylinder 2 with ordinary screws. This fixed position often caused lime milk to leak. The optimized design used countersunk screws for plug welding, which effectively solved the problem of lime milk leakage.

[0048] It should be noted that the above content is a further detailed description of the present invention in conjunction with specific implementation methods, and the specific implementation of the present invention cannot be considered to be limited to these descriptions; the dimensional data of this embodiment does not limit the technical solution of the present invention, but only illustrates several specific working conditions. For those skilled in the art of the present invention, simple improvements and modifications can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. A lime disintegrating machine, comprising a lime inlet (1), a water inlet (9), a cylinder (2), a motor (10), a propulsion shovel (3), and a fixed cover (15), wherein the front end of the cylinder (2) is provided with a lime inlet (1) and a water inlet (9), the outer side of the cylinder (2) is provided with a motor (10), a roller (17), and a tug device (18), the inside of the cylinder (2) is provided with a propulsion shovel (3), and the rear end of the cylinder (2) is provided with a fixed cover (15), characterized in that: A steam exhaust chimney (5) is provided on the upper portion of the fixed cover (15), a material discharge port is provided on the lower portion of the fixed cover (15), and a circular rotary screen is provided inside the fixed cover (15). The circular rotary screen comprises an inner rotary screen (8) and an outer rotary screen (7) arranged outside the inner rotary screen (8). The outer rotary screen (7) comprises a primary rotary screen (71) close to the rear end of the cylinder (2) and a secondary rotary screen (72) connected to the primary rotary screen (71).

2. The ash disintegrating machine according to claim 1, characterized in that: The inner pore diameter of the first-stage rotary screen (71) is 5mm-15mm, the inner pore diameter of the second-stage rotary screen (72) is 30mm-50mm, the inner pore diameter of the inner rotary screen (8) is 16mm-29mm, and the outer pore diameter of the pore is greater than or equal to the inner pore diameter.

3. The aperture according to claim 2, characterized in that: The circular rotary screen is provided with uniform sieve holes, which are different-diameter holes, with an outer pore diameter of bmm and an inner pore diameter of amm, where b=(1.05-1.3)*a.

4. The ash disintegrating machine according to claim 1, characterized in that: A spiral belt (16) is provided inside the secondary rotary screen (72), and a flat steel block is provided on the spiral belt.

5. The ash disintegrating machine according to claim 1, characterized in that: The discharge port comprises a lime milk outlet (11), a waste rock outlet (12) and a return rock outlet (13); the lime milk outlet (11) is arranged at the lower end of the first rotary screen (71); the waste rock outlet (12) is arranged at the lower end of the second rotary screen (72); and the return rock outlet (13) is arranged at the rear end of the inner rotary screen (8).

6. The ash disintegrating machine according to claim 1, characterized in that: A spray device is provided inside the exhaust chimney (5), and the spray device comprises a plurality of spray pipe inlets (14) and a hot water outlet (6). The plurality of spray pipe inlets (14) are provided at different heights inside the exhaust chimney (5), and the hot water outlet (6) is provided at the lower end of the spray pipe inlet (14).

7. The ash disintegrating machine according to claim 1, characterized in that: A washing water pipe (4) is provided on the upper side of the outer rotating screen (7), and a washing water pipe (4) is provided on the inner side of the inner rotating screen (8).

8. The ash disintegrating machine according to claim 1, characterized in that: The lime inlet (1) is provided with a conical channel, and the pushing plates (3) in the cylinder (2) are arranged in a stepped and progressive horizontal spiral.

9. The ash disintegrating machine according to claim 1, characterized in that: The rolling ring (17) is in direct contact with the tug device (18). The number of the tug devices (18) is 2 or 3 and is located at the bottom of the ash dissolving machine. The rolling ring (17) is fixed to the cylinder (2) by countersunk screws, and the countersunk screw holes on the inner side of the cylinder (2) are plug-welded.

10. The ash disintegrating machine according to claim 1, characterized in that: The material of the circular rotary screen is one of stainless steel, duplex steel and glass fiber reinforced plastic; And / or, the material of the cylinder (2) is one of stainless steel and carbon steel; And / or, the rolling ring (17) is made of a casting material, preferably cast steel.

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