Dry digestion ash-making system

Abstract

The utility model relates to the technical field of dry-process slaked lime, in particular to a dry-process slaked lime making system which comprises a quick lime bin, the quick lime bin is connected with a feeding device through a pipeline, the feeding device is connected with a feed port of a slaked lime bin, and a discharge port of the slaked lime bin is connected with a slaked lime bin through a pipeline. The feeding port is located on one side of the top of the digestion bin, a spraying pipe is arranged on the top of the side wall of the digestion bin, one end of the spraying pipe is close to the feeding port, and the other end of the spraying pipe penetrates through the side wall of the digestion bin and extends outwards to be connected with a water supply tank. The spray pipe is arranged at the top of the side wall of the slaking bin, so that the contact area between slaking water and quicklime is larger, the reaction is more sufficient, the quality of generated calcium hydroxide is improved, the calcium hydroxide with high quality and pure components is obtained, and the resource waste caused by overlarge dosage of the calcium hydroxide in the flue gas desulfurization process is avoided.

Description

Technical Field

[0001] This utility model relates to the field of dry slaking lime technology, and in particular to a dry slaking lime production system. Background Technology

[0002] Industrial flue gas emitted from ironmaking, rolling, and sintering processes in steel plants contains large amounts of pollutants such as SO2. The main SO2 treatment technology in steel plants employs semi-dry desulfurization processes. In the desulfurization tower, SO2 in the flue gas reacts with the absorbent calcium hydroxide (Ca(OH)2) to produce calcium sulfite (CaSO3) and calcium sulfate (CaSO4), thus achieving desulfurization. Ca(OH)2 can be prepared by slaking quicklime, that is, through the chemical reaction between quicklime and water to generate Ca(OH)2, completing the lime slaking reaction.

[0003] Dry slaking and lime production is a common process for Ca(OH)2 preparation. However, most dry slaking and lime production systems currently use water pipes that enter from the top and flow through grooves. During lime production, the reaction between the slaking water and quicklime is insufficient, and the effect cannot meet the requirements of the desulfurization and lime production process. This leads to an increase in material and water consumption, resulting in a waste of resources.

[0004] Therefore, a dry digestion and ash-making system with a more complete digestion reaction is needed. Utility Model Content

[0005] The purpose of this invention is to provide a dry slaking and ash-making system that enables quicklime to come into full contact with water, thus making the reaction more complete.

[0006] This utility model provides a dry slaking and ash production system, including a quicklime silo. The quicklime silo is connected to a feeding device via a pipe. The feeding device is connected to the inlet of the slaking silo. The outlet of the slaking silo is connected to the hydrated lime silo via a pipe. The inlet is located on one side of the top of the slaking silo. A spray pipe is provided on the top of the side wall of the slaking silo. One end of the spray pipe is close to the inlet, and the other end extends outward through the side wall of the slaking silo and connects to a water supply tank.

[0007] Preferably, a plurality of atomizing nozzles are connected to the spray pipe, and the atomizing nozzles are fan-shaped nozzles.

[0008] Preferably, the outlet of the atomizing nozzle is inclined upward, with an angle of 60-70° between it and the horizontal plane.

[0009] Preferably, the feeding device includes a rotary feeder connected to the bottom of the quicklime silo, the discharge end of the rotary feeder is connected to a weighing trough, and the weighing trough is connected to the feed inlet of the digestion silo through a first feeder.

[0010] Preferably, a second feeder is provided between the outlet of the digestion chamber and the quicklime silo.

[0011] Preferably, a first partition and a second partition are horizontally arranged from top to bottom inside the digestion chamber. The first partition and the second partition divide the interior of the digestion chamber into a primary digestion chamber, a secondary digestion chamber, and a tertiary digestion chamber. A channel is provided between the end of the first partition away from the feed inlet and the inner wall of the digestion chamber. A channel is also provided between the end of the second partition near the feed inlet and the inner wall of the digestion chamber. The discharge port is located at the bottom of the digestion chamber, away from the feed inlet.

[0012] Preferably, the material conveying direction in the primary digestion chamber, the secondary digestion chamber, and the tertiary digestion chamber is parallel to the axis of the spray pipe.

[0013] Preferably, the primary digester, the secondary digester, and the tertiary digester are all equipped with screw conveyors.

[0014] Preferably, the primary digestion chamber, the secondary digestion chamber, and the tertiary digestion chamber are all equipped with temperature measuring devices.

[0015] Preferably, the temperature measuring device is a bimetallic thermometer.

[0016] Beneficial effects:

[0017] This invention increases the contact area between the digester water and quicklime by installing a spray pipe on the top of the side wall of the digester, allowing for a more complete reaction and improving the quality of the generated calcium hydroxide. This results in high-quality, pure calcium hydroxide and avoids resource waste caused by excessive calcium hydroxide usage during flue gas desulfurization. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a side view of the spray device of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-Quicklime silo, 2-Rotary feeder, 3-Weighing trough, 4-First feeder, 5-Digestion silo, 6-Spray pipe, 7-Atomizing nozzle, 8-Baffle, 9-Screw conveyor, 10-Second feeder, 11-Water tank, 12-Slaked lime silo, 13-First-stage digestion silo, 14-Second-stage digestion silo, 15-Third-stage digestion silo. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1

[0027] like Figure 1-2As shown, a dry slaking and lime-making system includes a quicklime silo 1. The quicklime silo 1 is connected to a feeding device via a pipe. The feeding device includes a rotary feeder 2 connected to the bottom of the quicklime silo 1. The discharge end of the rotary feeder 2 is connected to a weighing trough 3. The weighing trough 3 is connected to the inlet of a slaking chamber 5 via a first feeder 4. The inlet is located on one side of the top of the slaking chamber 5. The weighing trough 3 allows for better control of the feed rate into the slaking chamber 5, facilitating the control of the entire reaction process by the operators.

[0028] A spray pipe 6 is installed on the top of the side wall of one side of the digestion chamber 5. One end of the spray pipe 6 is close to the feed inlet, and the other end extends outward through the side wall of the digestion chamber 5 to connect to the water supply tank 11. Several atomizing nozzles 7 are connected to the spray pipe 6, facing the other side of the digestion chamber 5. The atomizing nozzles 7 are fan-shaped nozzles, which cover a wider area. The outlet of the atomizing nozzles 7 is inclined upward, with an angle of 60-70° with the horizontal plane. Preferably, the angle between the atomizing nozzles 7 and the horizontal plane is 70°. The above-mentioned inclination angle of the atomizing nozzles 7 can make the digested water rise upward when sprayed, and spray a longer distance to fully contact the quicklime in the digestion chamber 5. The digestion chamber 5 is horizontally divided into a first partition 8 and a second partition 8 from top to bottom, which divide the interior of the digestion chamber 5 into a primary digestion chamber 13, a secondary digestion chamber 14, and a tertiary digestion chamber 15. A channel is provided between the end of the first partition 8 furthest from the inlet and the inner wall of the digestion chamber 5, and a channel is also provided between the end of the second partition 8 closest to the inlet and the inner wall of the digestion chamber 5. The outlet is located at the bottom of the digestion chamber 5, furthest from the inlet. Each of the primary digestion chamber 13, secondary digestion chamber 14, and tertiary digestion chamber 15 is equipped with a screw conveyor 9, and the material conveying direction is parallel to the axis of the spray pipe 6. The quicklime material moves downwards in a serpentine pattern within the digestion chamber 5 until it is discharged from the outlet.

[0029] Temperature measuring devices are installed inside the primary digestion chamber 13, secondary digestion chamber 14, and tertiary digestion chamber 15. These devices use bimetallic thermometers. During the dry digestion and ash production process, the temperature in the primary digestion chamber 13 is controlled at 100-120℃, the temperature in the secondary digestion chamber 14 at 120-140℃, and the temperature in the tertiary digestion chamber 15 at 100-120℃. The first feeder 4 provides quicklime to the digestion chamber 5 at a rate of 4 t / h. These parameters ensure better contact between the quicklime and the digestion water, resulting in a more complete reaction and higher quality calcium hydroxide, which helps reduce the amount of calcium hydroxide used in subsequent flue gas desulfurization and conserves resources.

[0030] The outlet pipe of digestion chamber 5 is connected to slaked lime chamber 12; a second feeder 10 is provided between the outlet of digestion chamber 5 and slaked lime chamber 12 to facilitate the storage of calcium hydroxide obtained from the reaction.

[0031] Work process:

[0032] Quicklime is output from quicklime silo 1, conveyed to weighing tank 3 by rotary feeder 2, and weighed after obtaining the target weight of quicklime. Then, it is fed into digestion silo 5 through first feeder 4. At the same time, atomizing nozzle 7 is turned on, and screw conveyors 9 in primary digestion silo 13, secondary digestion silo 14 and tertiary digestion silo 15 start to work. Quicklime is displaced under the action of screw conveyor 9 and fully contacts the digestion water in primary digestion silo 13. Then, it enters the lower digestion silo through the channel until the reaction is completed and calcium hydroxide is obtained. Calcium hydroxide is discharged from digestion silo 5 through the discharge port and stored in slaked lime silo 12.

[0033] During the reaction, the temperature inside the primary digestion chamber 13, the secondary digestion chamber 14, and the tertiary digestion chamber 15 can be detected by a bimetallic thermometer, and the rotation speed of each layer of screw conveyor 9 can be adjusted according to the detected temperature, so that the temperature inside each digestion chamber meets the requirements.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dry digestion and ash production system, characterized in that, It includes a quicklime silo, which is connected to a feeding device via a pipe. The feeding device is connected to the inlet of the digestion silo, and the outlet of the digestion silo is connected to the hydrated lime silo via a pipe. The inlet is located on one side of the top of the digestion silo, and a spray pipe is provided on the top of the side wall of the digestion silo. One end of the spray pipe is close to the inlet, and the other end extends outward through the side wall of the digestion silo to connect to a water supply tank.

2. The dry digestion and ash production system according to claim 1, characterized in that, The spray pipe is connected to several atomizing nozzles, and the atomizing nozzles are fan-shaped nozzles.

3. The dry digestion and ash production system according to claim 2, characterized in that, The atomizing nozzle outlet is inclined upwards, with an angle of 60-70° between it and the horizontal plane.

4. The dry digestion and ash production system according to claim 1, characterized in that, The feeding device includes a rotary feeder connected to the bottom of the quicklime silo, the discharge end of the rotary feeder is connected to a weighing trough, and the weighing trough is connected to the inlet of the digestion silo through a first feeder.

5. The dry digestion and ash production system according to claim 1, characterized in that, A second feeder is provided between the outlet of the digestion chamber and the quicklime silo.

6. The dry digestion and ash production system according to claim 1, characterized in that, The digestion chamber is horizontally arranged from top to bottom with a first partition and a second partition, which divide the interior of the digestion chamber into a primary digestion chamber, a secondary digestion chamber, and a tertiary digestion chamber. A channel is provided between the end of the first partition away from the feed inlet and the inner wall of the digestion chamber, and a channel is provided between the end of the second partition near the feed inlet and the inner wall of the digestion chamber. The discharge port is located at the bottom of the digestion chamber away from the feed inlet.

7. The dry digestion and ash production system according to claim 6, characterized in that, The material conveying direction in the primary digestion chamber, the secondary digestion chamber, and the tertiary digestion chamber is parallel to the axis of the spray pipe.

8. The dry digestion and ash production system according to claim 6, characterized in that, The primary digester, the secondary digester, and the tertiary digester are all equipped with screw conveyors.

9. The dry digestion and ash production system according to claim 6, characterized in that, Temperature measuring devices are installed inside the primary digestion chamber, the secondary digestion chamber, and the tertiary digestion chamber.

10. The dry digestion and ash production system according to claim 9, characterized in that, The temperature measuring device is a bimetallic thermometer.

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