Liquid ammonia intermediate tank for ethanolamine production

Abstract

The utility model discloses a liquid ammonia intermediate tank for ethanolamine production. The liquid ammonia intermediate tank comprises a tank body, limiting pipes are fixedly connected to one side and the bottom of the tank body, connecting pipes are inserted into the limiting pipes, flange plates are fixed to the ends, away from the tank body, of the connecting pipes, and sealing rubber strips are arranged between the surfaces of the connecting pipes and the tail ends of the limiting pipes; an outer annular groove is formed in the surface of the end, corresponding to the limiting pipe, of the connecting pipe, the position, corresponding to the outer annular groove, of the connecting pipe is sleeved with a flexible sealing pipe, a circle of inner annular groove is formed in the inner wall of the flexible sealing pipe, and a flexible sealing ring arranged at the position, corresponding to the outer annular groove, of the connecting pipe in a sleeving mode is installed in the inner annular groove. The limiting pipe is welded to the tank body, the spray gun head can conveniently stretch into the limiting pipe with the short length to conduct secondary spraying of an anti-corrosion coating, the limiting pipe and the connecting pipe are installed and connected through the flexible sealing pipe, the flexible sealing ring and the sealing rubber strip, elastic sealing is achieved, and the anti-corrosion effect is good. And the subsequent corrosion influence caused by direct welding in the prior art is avoided.

Description

Technical Field

[0001] This utility model relates to the field of chemical storage tank technology, specifically to a liquid ammonia intermediate tank for ethanolamine production. Background Technology

[0002] Ethanolamine is a general term for monoethanolamine, diethanolamine, and triethanolamine. At room temperature, they are all colorless, ammonia-smelling, hygroscopic, viscous liquids. They are commonly used in the production of detergents, textile auxiliaries, emulsifiers, petroleum product additives, pesticide and pharmaceutical intermediates, surfactants, leather softeners, oil and wax emulsifiers, and rubber auxiliaries. They have a wide range of applications and a large market demand.

[0003] Industrially, ethanolamine is produced by reacting ethylene oxide with an aqueous ammonia solution at 60–150°C and 3–15 MPa. Therefore, liquid ammonia is an important raw material. To ensure sufficient raw material, we need several intermediate liquid ammonia tanks to store the raw material and ensure the smooth production and processing of ethanolamine.

[0004] The existing intermediate tank and connecting pipe are directly welded together. During manufacturing, both the tank body and the connecting pipe are coated with anti-corrosion coatings inside and out, which can block and prevent liquid ammonia from corroding. However, when the tank body and the connecting pipe are welded together, the high temperature of welding will oxidize the anti-corrosion coating. The joint, which is originally silvery-white, turns black after welding. Small oxide particles can be felt by hand. During long-term contact with liquid ammonia, corrosion will occur at the joint and the corrosion area will gradually expand, damaging the tank body and affecting its use, which is a shortcoming. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a liquid ammonia intermediate tank for ethanolamine production, which solves the problem that welding between the tank body and connecting pipes of existing liquid ammonia intermediate tanks causes the anti-corrosion coating to fail, resulting in damage to the tank body and affecting its use.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] An intermediate tank for producing ethanolamine includes a tank body, with limiting tubes fixedly connected to one side and the bottom of the tank body. A connecting tube is inserted into the limiting tube, and a flange is fixed to the end of the connecting tube away from the tank body. A sealing strip is provided between the surface of the connecting tube and the end of the limiting tube.

[0008] The connecting pipe has an outer annular groove on one end of the limiting pipe. A flexible sealing pipe is fitted at the position of the connecting pipe corresponding to the outer annular groove. An inner annular groove is provided on the inner wall of the flexible sealing pipe. A flexible sealing ring is installed in the inner annular groove at the position of the connecting pipe corresponding to the outer annular groove. The flexible sealing pipe is inserted into the limiting pipe.

[0009] Preferably, the limiting tube is welded to the tank body, and the length of the limiting tube is 10-15 cm.

[0010] Preferably, the sealing strip is a solidified coating type structural sealant, and the coating thickness is not less than 0.5 cm.

[0011] Preferably, the axial length of the outer annular groove along the connecting pipe is greater than 15 cm.

[0012] Preferably, the axial length of the inner annular groove along the connecting pipe does not exceed 5 cm, and the inner annular groove is located inside the flexible sealing pipe near one end of the sealing strip.

[0013] Preferably, the flexible sealing tube is a low-density polyethylene sealing tube, and the flexible sealing ring is a low-density polyethylene sealing ring with a density lower than that of the flexible sealing tube.

[0014] Preferably, the limiting tube on the side of the tank is located at the upper part of the middle of the tank surface.

[0015] Preferably, the flexible sealing ring and the flexible sealing tube are interference-fitted between the limiting tube and the connecting tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The limiting tube of this invention is welded to the tank body. The shorter length of the limiting tube facilitates the insertion of the spray gun head into the interior for secondary spraying of the anti-corrosion coating, avoiding thermal oxidation damage to the original anti-corrosion coating caused by welding. The limiting tube and the connecting tube are connected by a flexible sealing tube, a flexible sealing ring, and a sealing strip to achieve elastic sealing. This eliminates the subsequent corrosion effects caused by direct welding in the prior art and solves the problem that welding between the tank body and the connecting tube of existing liquid ammonia intermediate tanks causes the anti-corrosion coating to fail, resulting in damage to the tank body and affecting its use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the tank body of this utility model at the location of the corresponding connecting pipe;

[0020] Figure 3 This is a cross-sectional view of the structure at the corresponding position of the connecting pipe of this utility model.

[0021] In the diagram: 1. Tank body; 2. Limiting pipe; 3. Connecting pipe; 4. Flange; 5. Sealing strip; 6. Outer annular groove; 7. Flexible sealing pipe; 8. Inner annular groove; 9. Flexible sealing ring. Detailed Implementation

[0022] 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.

[0023] like Figure 1-3 As shown, this utility model provides a technical solution: an intermediate liquid ammonia tank for ethanolamine production, including a tank body 1, with limiting tubes 2 fixedly connected to one side and the bottom of the tank body 1. The limiting tubes 2 on the side of the tank body 1 are located at the upper middle part of the surface of the tank body 1, and are used for feeding and discharging respectively. The limiting tubes 2 are welded to the tank body 1, and the length of the limiting tubes 2 is 10-15 cm. Due to the small length, after welding, the spray gun head is inserted to spray the anti-corrosion coating a second time, so as to avoid the original anti-corrosion coating being damaged by thermal oxidation caused by welding.

[0024] A connecting pipe 3 is inserted into the limiting pipe 2. A flange 4 is fixed to the end of the connecting pipe 3 away from the tank body 1. A sealing strip 5 is provided between the surface of the connecting pipe 3 and the end of the limiting pipe 2. The sealing strip 5 is a solidified coating type sealing structural adhesive, and the coating thickness is not less than 0.5 cm to improve the sealing effect.

[0025] The surface of the connecting pipe 3 corresponding to the limiting pipe 2 is provided with an outer annular groove 6. The outer annular groove 6 has an axial length of more than 15 cm along the connecting pipe 3. A flexible sealing pipe 7 is sleeved on the connecting pipe 3 at the position corresponding to the outer annular groove 6. An inner annular groove 8 is provided on the inner wall of the flexible sealing pipe 7. The inner annular groove 8 has an axial length of no more than 5 cm along the connecting pipe 3, and the inner annular groove 8 is located inside the flexible sealing pipe 7 near the end of the sealing strip 5.

[0026] A flexible sealing ring 9 is installed in the inner annular groove 8, which is sleeved at the position of the connecting pipe 3 corresponding to the outer annular groove 6. The flexible sealing pipe 7 is a low-density polyethylene sealing pipe, and the flexible sealing ring 9 is a low-density polyethylene sealing ring with a density lower than that of the flexible sealing pipe 7. It not only provides a sealing effect, but also has resistance to the corrosion of liquid ammonia. The flexible sealing pipe 7 is inserted into the limiting pipe 2. The flexible sealing ring 9 and the flexible sealing pipe 7 are interference-fitted between the limiting pipe 2 and the connecting pipe 3 to achieve a sealed installation.

[0027] Working principle:

[0028] By welding the limiting pipe 2 to the tank body 1, the shorter limiting pipe 2 allows the spray gun head to be inserted into the interior for secondary spraying of the anti-corrosion coating, avoiding the damage to the original anti-corrosion coating caused by welding due to thermal oxidation. The limiting pipe 2 and the connecting pipe 3 are connected by a flexible sealing pipe 7, a flexible sealing ring 9, and a sealing strip 5 to achieve elastic sealing. The flange 4 of the connecting pipe 3 is connected to the liquid ammonia conveying pipeline for loading and unloading. Since the liquid ammonia conveying pipeline is fixed, the connecting pipe 3 and the limiting pipe 2 only need to be sealed without rigid fixation to achieve a stable connection, eliminating the subsequent corrosion effects caused by direct welding in the existing technology.

[0029] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid ammonia intermediate tank for ethanolamine production, comprising a tank body (1), characterized in that: A limiting tube (2) is fixedly connected to one side and the bottom of the tank (1). A connecting tube (3) is inserted into the limiting tube (2). A flange (4) is fixed to one end of the connecting tube (3) away from the tank (1). A sealing strip (5) is provided between the surface of the connecting tube (3) and the end of the limiting tube (2). The connecting pipe (3) has an outer annular groove (6) on one end of the limiting pipe (2). A flexible sealing pipe (7) is sleeved at the position of the connecting pipe (3) corresponding to the outer annular groove (6). An inner annular groove (8) is provided on the inner wall of the flexible sealing pipe (7). A flexible sealing ring (9) is installed in the inner annular groove (8) at the position of the connecting pipe (3) corresponding to the outer annular groove (6). The flexible sealing pipe (7) is inserted into the limiting pipe (2).

2. The intermediate tank for liquid ammonia production of ethanolamine according to claim 1, characterized in that: The limiting tube (2) is welded to the tank body (1), and the length of the limiting tube (2) is 10-15 cm.

3. The intermediate tank for liquid ammonia production of ethanolamine according to claim 1, characterized in that: The sealing strip (5) is a solidified coating type sealing structural adhesive, and the coating thickness is not less than 0.5 cm.

4. The intermediate tank for liquid ammonia production of ethanolamine according to claim 1, characterized in that: The outer annular groove (6) has an axial length of more than 15 cm along the connecting pipe (3).

5. The intermediate tank for liquid ammonia production of ethanolamine according to claim 1, characterized in that: The inner annular groove (8) has an axial length of no more than 5 cm along the connecting pipe (3), and the inner annular groove (8) is located inside the flexible sealing pipe (7) near one end of the sealing strip (5).

6. The intermediate tank for liquid ammonia production of ethanolamine according to claim 1, characterized in that: The flexible sealing tube (7) is a low-density polyethylene sealing tube, and the flexible sealing ring (9) is a low-density polyethylene sealing ring with a density lower than that of the flexible sealing tube (7).

7. The intermediate tank for liquid ammonia production of ethanolamine according to claim 1, characterized in that: The limiting tube (2) on the side of the tank (1) is located at the upper part of the middle of the surface of the tank (1).

8. The intermediate tank for liquid ammonia production of ethanolamine according to claim 1, characterized in that: The flexible sealing ring (9) and the flexible sealing tube (7) are interference-fitted between the limiting tube (2) and the connecting tube (3).

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