A lime liquor feeding device for a methanol distillation section

Abstract

The utility model discloses a lime liquid feeding device for methanol distillation section belongs to chemical equipment technical field, and this device aims at solving the security hidden danger problem of steam backflow when feeding to negative pressure equipment, and lime liquid preparation tank, connecting pipeline and mixing assembly are connected, and connecting pipeline is connected with lime liquid preparation tank and methanol distillation kettle, and mixing assembly is arranged in lime liquid preparation tank, and protection assembly is arranged in connecting pipeline, and protection assembly includes mounting bracket, the seal plate that can slide in mounting bracket, the guide rod and fixed block that are fixedly connected with seal plate, and the spring that exerts pre -tightening force to seal plate. Mixing assembly includes driving motor, rotates the column, and the spiral stirring vane and the scraper that are fixed on rotating column. The utility model discloses through the automatic opening and closing of protection assembly, and effectively prevents the backflow of methanol steam, and through the synergies of mixing assembly, realizes the uniform preparation and anti -scale of lime liquid, improves the security and automation level of device.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a lime solution dosing device for methanol distillation. Background Technology

[0002] In the production and distillation purification of methanol, the methanol distillation section is a crucial step in ensuring product quality. In this section, lime is often added to the methanol distillation vessel to adjust the pH of the material or to remove certain impurities.

[0003] The initial method of addition was to directly add powdered lime to the methanol distillation vessel, but this method had obvious drawbacks. Due to the uneven dispersion and slow dissolution rate of the powder in the liquid, the reaction efficiency was low. More seriously, undissolved lime particles easily adhered to the high-temperature inner wall of the distillation vessel or the surface of the heat exchange tubes, forming hard scale that was difficult to remove, which seriously affected the heat transfer efficiency and normal operation of the equipment.

[0004] To address the aforementioned issues, existing technology has been improved by installing a separate preparation tank outside the methanol distillation vessel. Lime and water are pre-mixed into a homogeneous lime slurry, which is then transported into the distillation vessel. While this method improves the mixing effect, it introduces a more challenging safety problem.

[0005] Because methanol distillation kettles are often operated under high temperature and negative pressure, and are filled with flammable, explosive, and toxic methanol vapor, the connecting pipes used to transport lime slurry form a direct physical channel between the feed inlet and the atmospheric pressure lime slurry preparation tank. During feeding intervals or after feeding is completed, methanol vapor in the methanol distillation kettle can easily flow backward along the connecting pipes to the lime slurry preparation tank and further leak into the external environment. This not only causes contamination and loss of raw materials but also poses safety hazards such as fire, explosion, and poisoning.

[0006] Therefore, this utility model proposes a lime liquid addition device for methanol distillation to address the shortcomings of the prior art. Utility Model Content

[0007] To overcome the above shortcomings, this utility model provides a lime liquid addition device for methanol distillation, aiming to improve the problem that the existing lime addition device structure cannot simultaneously ensure uniform mixing of lime and safety during the addition process.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a lime slurry dosing device for a methanol distillation section, comprising: a lime slurry preparation tank, a mixing component disposed in the inner cavity of the lime slurry preparation tank, and a connecting pipe with one end connected to the lime slurry preparation tank and the other end connected to the methanol distillation kettle; and a protective component disposed in the connecting pipe, the protective component comprising a mounting frame, a sliding fit groove provided on the inner wall of the mounting frame, a sealing plate having its side edge slidingly fitted to the inner wall of the mounting frame along the sliding fit groove, a guide rod fixedly connected to one end of the sealing plate, a fixing block fixedly connected to the end of the guide rod away from the sealing plate, a spring having one end abutting against the end face of the fixing block, and the other end abutting against the inner wall of the mounting frame, the mixing component comprising a drive motor, the drive motor being drivenly connected to a rotating column vertically disposed in the inner cavity of the lime slurry preparation tank, a spiral stirring blade fixedly connected to the outer wall of the rotating column via a first connecting rod, and a scraper fixedly connected to the outer wall of the rotating column via a second connecting rod.

[0009] Preferably, the mounting bracket has an inlet and an outlet on its side wall.

[0010] Preferably, the outer wall of the scraper is in contact with the inner wall of the lime solution preparation tank.

[0011] Preferably, the lime slurry addition device for the methanol distillation section further includes a screw feeder disposed above the lime slurry preparation tank and a lime silo disposed above the feed end of the screw feeder; the feed end of the screw feeder is connected to the outlet of the lime silo, and the discharge end of the screw feeder extends into the inner cavity of the lime slurry preparation tank.

[0012] Preferably, a weighing module is provided at the bottom of the lime slurry preparation tank.

[0013] Preferably, the lime solution preparation tank has a water inlet on its side wall, and the water inlet is connected to the filtrate water delivery pipeline.

[0014] Preferably, the lime solution addition device for the methanol distillation section further includes an acid tank.

[0015] This utility model has the following beneficial effects:

[0016] 1. This utility model solves the problems of uneven dissolution and easy scaling on the tank wall caused by direct addition of lime or simple stirring in the prior art by setting a mixing component with both spiral stirring blades and scraper in the lime slurry preparation tank. It achieves the effect of both efficient preparation of uniform slurry and active scale prevention, ensuring the long-term stable operation of the device.

[0017] 2. This utility model solves the safety hazard of high temperature, toxic, flammable and explosive vapor backflow when feeding materials into negative pressure equipment by setting a protective component in the connecting pipe that opens by negative pressure and automatically resets by spring force. It achieves the effect of safe one-way conveying of slurry, effectively eliminates the risk of methanol vapor backflow, and significantly improves production safety. Attached Figure Description

[0018] Figure 1 This is a perspective view of a lime solution addition device for a methanol distillation section according to the present invention;

[0019] Figure 2 This is a schematic diagram of a lime solution preparation tank for a lime solution addition device in a methanol distillation section, as proposed in this utility model.

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is a schematic diagram of the connecting pipes of a lime solution addition device for a methanol distillation section according to the present invention.

[0022] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0023] Legend:

[0024] 1. Methanol distillation kettle; 2. Mixing assembly; 201. Drive motor; 202. Rotating column; 203. First connecting rod; 204. Spiral stirring blade; 205. Second connecting rod; 206. Scraper; 3. Protective assembly; 301. Mounting bracket; 302. Inlet; 303. Outlet; 304. Sealing plate; 305. Guide rod; 306. Fixing block; 307. Spring; 4. Acid tank; 5. Lime silo; 6. Screw feeder; 7. Lime solution preparation tank; 8. Weighing module; 9. Connecting pipe; 10. Filtrate water. Detailed Implementation

[0025] 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.

[0026] Reference Figures 1-5The present invention provides an embodiment of a lime slurry addition device for a methanol distillation process, comprising a lime slurry preparation tank 7, one end of a connecting pipe 9 connected to the lime slurry preparation tank 7, and the other end of the connecting pipe 9 connected to a methanol distillation kettle 1. The lime slurry preparation tank 7 is used to pre-mix lime and filtrate water 10 to prepare a slurry, the methanol distillation kettle 1 is used for the methanol distillation and purification process, and the connecting pipe 9 is used to transport the slurry prepared by the lime slurry preparation tank 7 to the methanol distillation kettle 1. A mixing component 2 is provided in the inner cavity of the lime slurry preparation tank 7, and a protective component 3 is provided in the connecting pipe 9.

[0027] Specifically, the protective component 3 includes a mounting bracket 301, the inner wall of which is provided with a sliding groove, the side edge of the sealing plate 304 is slidably fitted to the inner wall of the mounting bracket 301 along the sliding groove, one end of the sealing plate 304 is fixedly connected to a guide rod 305, the end of the guide rod 305 away from the sealing plate 304 is fixedly connected to a fixing block 306, one end of the spring 307 abuts against the end face of the fixing block 306, and the other end abuts against the inner wall of the mounting bracket 301, and the side wall of the mounting bracket 301 is provided with an inlet 302 and an outlet 303;

[0028] Furthermore, the mixing component 2 includes a drive motor 201, the output end of which is connected to a rotating column 202. The rotating column 202 is vertically arranged in the inner cavity of the lime slurry preparation tank 7. One end of the first connecting rod 203 is fixedly connected to the outer wall of the rotating column 202, and the other end is fixedly connected to a spiral stirring blade 204. One end of the second connecting rod 205 is fixedly connected to the outer wall of the rotating column 202, and the other end is fixedly connected to a scraper 206. The outer wall of the scraper 206 is in contact with the inner wall of the lime slurry preparation tank 7.

[0029] The mounting bracket 301 of the protective component 3 is fixed to the inner wall of the connecting pipe 9 by welding or flange connection. The interior of the mounting bracket 301 forms a cavity. An axially extending sliding groove is integrally formed on the inner wall of the mounting bracket 301. The side of the sealing plate 304 is provided with a guide block that matches the shape and size of the sliding groove. The guide block slides in the sliding groove, ensuring the high stability and anti-deflection ability of the sealing plate 304 during reciprocating motion.

[0030] Meanwhile, a guide rod 305 is fixedly connected to one end of the sealing plate 304 by bolts. A fixing block 306 is integrally formed at the other end of the guide rod 305 away from the sealing plate 304. The guide rod 305 is used to transmit the movement of the sealing plate 304. A spring 307 surrounds the outer periphery of the guide rod 305. One end of the spring 307 abuts against the end face of the fixing block 306 facing the sealing plate 304, and the other end of the spring 307 abuts against the inner wall of the mounting bracket 301. In the initial state, the spring 307 is in a pre-compressed state. The rebound force of the spring 307 pushes the fixing block 306, thereby causing the sealing plate 304 to seal against the inner wall of the mounting bracket 301, blocking the inlet 302. The opening and closing action of this protective component 3 is achieved by the negative pressure generated by the methanol distillation kettle 1 and the rebound force of the spring 307, without the need for an additional power source.

[0031] To achieve automatic feeding and precise proportioning of lime, a screw feeder 6 is installed above the lime slurry preparation tank 7. The feed end of the screw feeder 6 is connected to the outlet of the lime-lime silo 5 via a flange. The lime silo 5 is located above the feed end of the screw feeder 6 and is used to store powdered lime. The discharge end of the screw feeder 6 extends to the upper part of the inner cavity of the lime slurry preparation tank 7. A weighing module 8 is installed at the bottom of the lime slurry preparation tank 7. The weighing module 8 is used to monitor the total weight of the material in the lime slurry preparation tank 7 in real time. The amount of lime added is precisely controlled by controlling the start and stop of the screw feeder 6. In order to facilitate the addition of filtrate water 10, a water inlet is opened on the side wall of the lime slurry preparation tank 7. The water inlet is connected to the filtrate water 10 conveying system through a pipeline. The amount of filtrate water 10 injected can also be precisely controlled by the change in the reading of the weighing module 8. This lime slurry dosing device for the methanol distillation section can also be used in conjunction with an acid tank 4. The acid tank 4 is used to store acidic media for process needs.

[0032] Working principle: When preparing lime solution, lime in lime silo 5 is conveyed to lime solution preparation tank 7 by screw feeder 6. At the same time, filtrate water 10 is injected into lime solution preparation tank 7. The weight of lime and filtrate water 10 is monitored by weighing module 8 at the bottom of lime solution preparation tank 7 to ensure accurate proportioning. Then, drive motor 201 of mixing component 2 is started. Drive motor 201 drives rotating column 202 to rotate. Rotating column 202 drives spiral stirring blade 204 to rotate synchronously through first connecting rod 203. Spiral stirring blade 204 stirs the liquid in lime solution preparation tank 7 at high speed to accelerate lime dissolution and mixing. At the same time, rotating column 202 drives scraper 206 to rotate through second connecting rod 205. The outer wall of scraper 206 continuously scrapes the inner wall of lime solution preparation tank 7 to prevent lime from adhering and scaling.

[0033] When lime solution is added, the negative pressure inside the methanol distillation kettle 1 acts on the sealing plate 304 inside the protective assembly 3 through the connecting pipe 9. Under the action of negative pressure, the sealing plate 304 overcomes the elastic force of the spring 307 and slides along the inner wall of the mounting frame 301. The sliding of the sealing plate 304 drives the fixing block 306 to move synchronously through the guide rod 305, thereby compressing the spring 307. At this time, the lime solution flows into the mounting frame 301 through the inlet 302 and enters the methanol distillation kettle 1 through the outlet 303. When the negative pressure disappears, the compressed spring 307 rebounds and pushes the fixing block 306 to reset. The fixing block 306 drives the sealing plate 304 to slide in the opposite direction through the guide rod 305 until the sealing plate 304 completely seals the inlet 302, thereby effectively preventing the methanol vapor in the methanol distillation kettle 1 from flowing back into the lime solution preparation tank 7.

Claims

1. A lime solution addition device for a methanol distillation section, comprising: A lime slurry preparation tank (7) is provided with a mixing component (2) in its inner cavity; A connecting pipe (9) is provided, one end of which is connected to the lime solution preparation tank (7), and the other end is connected to the methanol distillation kettle (1). Its features are: The connecting pipe (9) is provided with a protective component (3), which includes: a mounting bracket (301), a sealing plate (304), and a spring (307). The inner wall of the mounting bracket (301) is provided with a sliding groove. The side of the sealing plate (304) slides along the sliding groove and is slidably fitted to the inner wall of the mounting bracket (301). One end of the sealing plate (304) is fixedly connected to a guide rod (305). The end of the guide rod (305) away from the sealing plate (304) is fixedly connected to a fixing block (306). One end of the spring (307) abuts against the end face of the fixing block (306), and the other end abuts against the inner wall of the mounting bracket (301). The mixing component (2) includes: a drive motor (201), a first connecting rod (203), the output end of the drive motor (201) is connected to a rotating column (202), the rotating column (202) is vertically arranged in the inner cavity of the lime liquid preparation tank (7), one end of the first connecting rod (203) is fixedly connected to the outer wall of the rotating column (202), and the other end is fixedly connected to a spiral stirring blade (204); a second connecting rod (205), one end of the second connecting rod (205) is fixedly connected to the outer wall of the rotating column (202), and the other end is fixedly connected to a scraper (206).

2. The lime solution addition device for a methanol distillation section according to claim 1, characterized in that: The mounting bracket (301) has an inlet (302) and an outlet (303) on its side wall.

3. The lime solution addition device for a methanol distillation section according to claim 1, characterized in that: The outer wall of the scraper (206) is in contact with the inner wall of the lime solution preparation tank (7).

4. A lime solution addition device for a methanol distillation section according to claim 1, characterized in that: A screw feeder (6) is provided above the lime slurry preparation tank (7). The feed end of the screw feeder (6) is connected to the outlet of the lime silo (5), and the discharge end of the screw feeder (6) extends into the inner cavity of the lime slurry preparation tank (7).

5. A lime solution addition device for a methanol distillation section according to claim 4, characterized in that: The lime bin (5) is located above the feed end of the screw feeder (6).

6. A lime solution addition device for a methanol distillation section according to claim 1, characterized in that: The bottom of the lime slurry preparation tank (7) is equipped with a weighing module (8).

7. A lime solution addition device for a methanol distillation section according to claim 1, characterized in that: The lime solution preparation tank (7) has an inlet on its side wall, which is connected to the pipeline for conveying filtrate water (10).

8. A lime solution addition device for a methanol distillation section according to claim 1, characterized in that: The methanol distillation section also includes an acid tank (4).

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