A device for improving the stability of the mother liquor distillation tower in soda ash production.

Abstract

This utility model discloses a device for improving the stability of a mother liquor distillation tower in soda ash production. The device includes a distillation tower and a pre-ash tank. The distillation tower comprises a preheating section and a distillation section from top to bottom. The inlet of the preheating section is connected to the top of the pre-ash tank via a horizontal pipeline. The distillation section is connected to the bottom of the pre-ash tank via a mixing liquid pipeline. The mixing liquid pipeline between the distillation section and the bottom of the pre-ash tank is L-shaped. The vertical line of the mixing liquid pipeline is installed between the stirring shaft and the tank wall inside the pre-ash tank, and the horizontal line is connected to the inlet of the distillation section. Compared with the prior art, this utility model modifies the existing pipeline paths of the distillation tower and pre-ash tank, effectively improving the prevention of blockages at the bottom of the pre-ash tank and in the mixing liquid pipeline, avoiding poor gas outlet and pressure fluctuations in the distillation tower, improving the stability of the distillation system in soda ash production, extending the equipment operating cycle, and reducing production costs.

Description

Technical Field

[0001] This utility model relates to the field of ammonia-soda process soda ash production technology, and in particular to a device for improving the stability of the mother liquor distillation tower in soda ash production. Background Technology

[0002] Soda ash is one of the basic raw materials in the chemical industry, widely used in glass, papermaking, textile printing and dyeing, detergents, food, and pharmaceutical industries. In the ammonia-soda process for producing soda ash, ammonia (NH3) exists as an intermediate medium, continuously circulating throughout the process. This circulation is achieved through an absorption-distillation process. Removing ammonia from the solution is a complex process requiring large-scale equipment. The pre-ash tank, as a key piece of equipment in the absorption-distillation process, primarily functions to thoroughly mix and react the preheated mother liquor with lime slurry in the distillation tower, converting the bound ammonium into free ammonia, which is then returned to the distillation tower for distillation to remove the free ammonia.

[0003] Due to the complex and unique working environment inside the pre-ash tank, calcium ions in the lime slurry easily combine with other anions, forming scale on the blades and affecting stirring efficiency. Furthermore, the lime slurry contains sand impurities, and to prevent excessive speed of the pre-ash tank's vibrating stirring shaft, some sand particles cannot be discharged with the mixing liquid in time, causing accumulation at the bottom of the tank and clogging the outlet. In addition, uneven mixing of the lime slurry and mother liquor, with lime slurry directly entering the mixing liquid pipeline, leads to large fluctuations in the pre-ash liquid flow rate due to the poor fluidity of the lime slurry. This results in significant pressure fluctuations in the distillation tower, affecting the ammonia content in the waste liquid and causing distillation tower blockage, thus impacting the long-term operation of the distillation tower.

[0004] Therefore, it is of great significance to explore a device that can improve the stability of the mother liquor distillation tower in soda ash production. Utility Model Content

[0005] The purpose of this invention is to provide a device for improving the stability of the mother liquor distillation tower in soda ash production. By modifying the existing pipeline routes of the distillation tower and the pre-ash tank, it can effectively improve the blockage at the bottom of the pre-ash tank and the mixing liquid pipeline, avoid poor gas outlet and pressure fluctuations in the distillation tower, improve the stability of the distillation system in soda ash production, extend the equipment operating cycle, and reduce production costs, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An apparatus for improving the stability of a mother liquor distillation tower in soda ash production includes a distillation tower and a pre-ash tank. The distillation tower includes a preheating section and a distillation section from top to bottom. The inlet of the preheating section and the top of the pre-ash tank are connected by a horizontal pipeline, and the distillation section is connected to the bottom of the pre-ash tank by a mixing liquid pipeline.

[0007] A further improvement to this invention is that the pre-ash bucket is 8–13 m high, 5–8 m in diameter, and has an effective volume of 157–550 m³. 3 The flow rates of the ammonia preheating mother liquor and lime slurry in the tank are 200–265 m³ / h. 3 / h.

[0008] A further improvement of this utility model is that a set of biased stirring device is installed inside the pre-ash bucket.

[0009] A further improvement of this utility model is that the biased stirring device includes a stirring shaft and a stirring paddle, and the axis of the stirring device is offset from the vertical center line of the pre-ash bucket by 2 to 3.5 m.

[0010] A further improvement of this utility model is that the stirring shaft is 10-15m long and the stirring paddle is 1-3m in diameter.

[0011] A further improvement of this utility model is that the mixing liquid pipeline between the distillation section and the bottom of the pre-ash tank is "L"-shaped, with the vertical pipeline of the mixing liquid pipeline installed between the stirring shaft and the tank wall inside the pre-ash tank, and the horizontal pipeline connected to the inlet of the distillation section.

[0012] A further improvement of this utility model is that a flushing water pipeline is installed on the horizontal section of the mixing liquid pipeline, and one end of the flushing water pipeline is connected to a water source.

[0013] A further improvement of this utility model is that a shut-off valve is installed on the flushing water pipeline.

[0014] The beneficial effects of this utility model are: This invention relates to a device for improving the stability of the mother liquor distillation tower in soda ash production. By modifying the existing pipeline routes of the distillation tower and pre-ash tank, it can effectively improve the blockage at the bottom of the pre-ash tank and the mixing liquid pipeline, avoid poor gas outlet and pressure fluctuations in the distillation tower, improve the stability of the distillation system in soda ash production, extend the equipment operating cycle, and reduce production costs.

[0015] This invention relates to a device for improving the stability of the mother liquor distillation tower in soda ash production. By increasing the relative height between the preheating section and the top outlet pipeline of the pre-ash tank, the operational flexibility of the entire distillation system can be improved, reducing system fluctuations in the event of a short-term rise in the liquid level of the pre-ash tank.

[0016] This invention relates to a device for improving the stability of the mother liquor distillation tower in soda ash production. By changing the blending liquid pipeline between the distillation section and the bottom of the pre-ash tank to an "L" shape, and by adding a flushing water pipeline to the blending liquid pipeline, it can effectively prevent scaling and blockage inside the blending liquid pipeline, avoid poor liquid discharge from the pre-ash tank, and prevent the liquid level from rising, which would cause fluctuations in the distillation system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] In the diagram: 1-Distillation tower, 101-Preheating section, 102-Distillation section, 2-Pre-ash bucket, 3-Horizontal pipeline, 4-Oblique flow stirring device, 401-Stirring shaft, 402-Stirring paddle, 5-Rinsing water pipeline, 6-Stop valve, 7-Blending liquid pipeline. Detailed Implementation

[0019] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1: As Figure 1 As shown, an apparatus for improving the stability of a mother liquor distillation tower in soda ash production includes a distillation tower 1 and a pre-ash tank 2. The distillation tower 1 includes a preheating section 101 and a distillation section 102 from top to bottom. The inlet of the preheating section 101 and the top of the pre-ash tank 2 are connected by a horizontal pipeline 3, and the distillation section 102 is connected to the bottom of the pre-ash tank 2 by a mixing liquid pipeline 7.

[0021] The pre-ash hopper 2 is 8-13m high, 5-8m in diameter, and has an effective volume of 157-550m³. 3 The flow rates of the ammonia preheating mother liquor and lime slurry in the tank are 200–265 m³ / h. 3 / h.

[0022] The pre-ash bucket 2 is equipped with a set of eccentric stirring device 4.

[0023] The biased stirring device 4 includes a stirring shaft 401 and a stirring paddle 402. The installation position of the stirring device is offset from the vertical center line of the pre-ash bucket 2 by 2 to 3.5m.

[0024] The stirring shaft 401 is 10-15m long, and the stirring paddle 402 is 1-3m in diameter.

[0025] The mixing liquid pipeline 7 between the distillation section 102 and the bottom of the pre-ash tank 2 is "L" shaped. The vertical pipeline of the mixing liquid pipeline 7 is installed between the stirring shaft 401 and the tank wall inside the pre-ash tank 2, and the horizontal pipeline is connected to the inlet of the distillation section 102.

[0026] Example 2: This example is a further improvement on Example 1. The main improvement is that in Example 1, the transport vehicle was inconvenient to push; while in this example, the above-mentioned defects can be avoided. Specifically: A flushing water pipeline 5 is installed on the horizontal section of the mixing liquid pipeline 7, and one end of the flushing water pipeline 5 is connected to a water source; a shut-off valve 6 is installed on the flushing water pipeline 5; in this embodiment, by changing the mixing liquid pipeline 7 between the distillation section 102 and the bottom of the pre-ash tank 2 to an "L" shape design, and by adding a flushing water pipeline 5 to the mixing liquid pipeline 7, it is possible to effectively avoid internal scaling and blockage of the mixing liquid pipeline 7, and to avoid poor liquid discharge and liquid level rise in the pre-ash tank 2, which would cause fluctuations in the distillation system.

[0027] Apart from the above, this embodiment is exactly the same as Embodiment 1, and will not be described again here.

[0028] The specific working principle of this utility model is as follows: During operation, the preheated mother liquor and ash slurry react in the pre-ash tank 2 to form a blended liquid, which is then sent to the distillation section 102 of the distillation tower 1 through the "L"-shaped blended liquid pipeline 7. The ammonia gas obtained after distillation is discharged from the pre-ash tank 2 through the horizontal pipeline 3. In addition, a flushing water pipeline 5 is installed on the blended liquid pipeline 7 to periodically flush the inside of the blended liquid pipeline 7, which can effectively prevent scaling and blockage inside the blended liquid pipeline 7, and avoid poor liquid discharge and liquid level rise in the pre-ash tank 2, which would cause fluctuations in the distillation system.

[0029] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for improving the stability of a mother liquor distillation tower in soda ash production, characterized in that: It includes a distillation column (1) and a pre-ash tank (2). The distillation column (1) includes a preheating section (101) and a distillation section (102) from top to bottom. The inlet of the preheating section (101) and the top of the pre-ash tank (2) are connected by a horizontal pipeline (3). The distillation section (102) is connected to the bottom of the pre-ash tank (2) by a mixing liquid pipeline (7).

2. The apparatus for improving the stability of the mother liquor distillation tower in soda ash production as described in claim 1, characterized in that: The pre-ash bucket (2) is 8-13m high, 5-8m in diameter, and has an effective volume of 157-550m³. 3 The flow rates of the ammonia preheating mother liquor and lime slurry in the tank are 200–265 m³ / h. 3 / h.

3. The apparatus for improving the stability of the mother liquor distillation tower in soda ash production as described in claim 1 or 2, characterized in that: The pre-ash bucket (2) is equipped with a set of eccentric stirring device (4).

4. The apparatus for improving the stability of the mother liquor distillation tower in soda ash production as described in claim 3, characterized in that: The biased stirring device (4) includes a stirring shaft (401) and a stirring paddle (402). The stirring device is installed at a position where the axis is offset from the vertical center line of the pre-ash bucket (2) by 2 to 3.5 m.

5. The apparatus for improving the stability of the mother liquor distillation tower in soda ash production as described in claim 4, characterized in that: The stirring shaft (401) is 10-15m long and the stirring paddle (402) is 1-3m in diameter.

6. The apparatus for improving the stability of the mother liquor distillation tower in soda ash production as described in claim 1, characterized in that: The mixing liquid pipeline (7) between the distillation section (102) and the bottom of the pre-ash tank (2) is "L" shaped. The vertical pipeline of the mixing liquid pipeline (7) is installed between the stirring shaft (401) and the tank wall inside the pre-ash tank (2), and the horizontal pipeline is connected to the inlet of the distillation section (102).

7. The apparatus for improving the stability of the mother liquor distillation tower in soda ash production as described in claim 1, characterized in that: The horizontal section of the mixing liquid pipeline (7) is equipped with a flushing water pipeline (5), and one end of the flushing water pipeline (5) is connected to a water source.

8. The apparatus for improving the stability of the mother liquor distillation tower in soda ash production as described in claim 7, characterized in that: A shut-off valve (6) is installed on the flushing water pipeline (5).

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