Jacket structure of polyvinyl chloride resin reaction kettle

Abstract

The utility model discloses a jacket structure of a polyvinyl chloride resin reaction kettle, and relates to the technical field of jacket structures of polymerization kettles. The jacket structure of the polyvinyl chloride resin reaction kettle comprises a reaction kettle body, a jacket is arranged on the side wall of the reaction kettle body, and supporting legs are uniformly distributed at the lower end of the reaction kettle body; the inner sides of the supporting legs are fixedly connected with the side wall of the reaction kettle body, and the jackets on the two sides of the supporting legs stretch across the supporting legs through bridging structures. According to the structure, the supporting legs are directly welded on the outer side wall of the reaction kettle, and the jacket is externally arranged and stretches across the supporting legs, so that when the jacket needs to be overhauled, the supporting legs are prevented from being cut for repair welding of the jacket, the overhaul efficiency is improved, equipment accidents are prevented, leakage points are easy to find, the overhaul difficulty and strength are reduced, the maintenance cost is saved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of the jacket structure of a polymerization kettle, in particular to a jacket structure of a polyvinyl chloride resin reaction kettle. Background Art

[0002] At present, during the production process of micro-suspension polyvinyl chloride in China, vertical polymerization kettles are mainly used as reaction devices, and its main heat exchange structure is as follows: a large number of semi-circular pipe jackets are welded on the outer wall of the vertical polymerization kettle, and the legs are evenly distributed and welded on the semi-circular pipe jacket on the outer wall of the polymerization kettle. During the polyvinyl chloride reaction process, the reaction conditions are controlled by introducing cold and hot circulating water into the jacket on the outer wall of the polymerization kettle, as Figure 1 shown. However, during the actual production process of special polyvinyl chloride resin, the jacket inside the leg of the vertical polymerization kettle will corrode and leak with the increase of the service life. During maintenance, a part of the leg of the polymerization kettle needs to be cut open to find the leakage point. Rust removal, grinding, and repair welding are carried out on the leakage point of the jacket, and anti-corrosion is carried out in time. After repair welding, in order to maintain the original leg strength, the cut part is welded back again, resulting in an increase in maintenance costs, an increase in manual maintenance intensity, an impact on the on-site environment, affecting the stable operation of production safety, and thus affecting product quality; moreover, the strength of the I-beam after repair welding will also decrease, and over time, it will form a safety hazard. Summary of the Utility Model

[0003] In order to solve the above technical problems, the utility model provides a jacket structure of a polyvinyl chloride resin reaction kettle, which avoids cutting the leg for repairing and welding the jacket, and improves the maintenance efficiency.

[0004] To achieve this technical purpose, the utility model adopts the following scheme: the jacket structure of a polyvinyl chloride resin reaction kettle includes a reaction kettle body, a jacket is arranged on the side wall of the reaction kettle body, and legs are evenly distributed at the lower end of the reaction kettle body; the inner side of the legs is fixedly connected to the side wall of the reaction kettle body, and the jackets on both sides of the legs straddle over the legs in a cross-connection structure.

[0005] Compared with the prior art, the beneficial effect of the utility model lies in that: in this structure, the legs are directly welded on the outer side wall of the reaction kettle, and the jacket is externally arranged and straddles over the legs. When the jacket needs to be maintained, cutting the legs for repairing and welding the jacket is avoided, the maintenance efficiency is improved, equipment accidents are prevented, the leakage point is easy to find, the maintenance difficulty and intensity are reduced, the maintenance cost is saved, and the cost is reduced.

[0006] Furthermore, the end parts of each layer of jacket on both sides of the legs are respectively blocked, connection holes are opened on the jacket tube walls outside the blocked ends, and the two connection holes are connected through a U-shaped tube to form a cross-connection structure to straddle over the legs.

[0007] Furthermore, the U-shaped tube is a seamless steel tube with good sealing performance. Description of the Drawings

[0008] Figure 1 The leg and jacket structures of a reactor in the prior art

[0009] Figure 2 A schematic cross-sectional view of the jacket structure of a polyvinyl chloride resin reactor provided by an embodiment of the present invention

[0010] Figure 3 A schematic side view of the jacket structure of a polyvinyl chloride resin reactor provided by an embodiment of the present invention

[0011] The markings in the figure are: 1, the reactor body; 2, the jacket; 3, the leg; 4, the bridging structure Specific embodiments

[0012] To fully understand the purpose, features and effects of the present invention, the present invention will be described in detail by means of the following specific embodiments, but the present invention is not limited thereto

[0013] As Figure 2 and Figure 3 shown, a jacket structure of a polyvinyl chloride resin reactor provided by the present invention includes a reactor body 1, a jacket 2 and a leg 3. A spiral round tube jacket 2 is welded to the outer side wall of the reactor body 1. Legs 3 are respectively arranged in the circumferential direction at the lower part of the reactor body 1. The inner side wall of the leg 3 is directly welded and fixed to the side wall of the reactor body 1. The jacket at the position where the leg 3 is located is set as a bridging structure 4

[0014] Both ends of each layer of the jacket 2 fixed to the outer wall of the reactor body 1 on both sides of the leg 3 are welded and sealed with a sealing plate. Connecting holes are opened on the jacket tube wall outside the sealing plate. Two connecting holes on the same layer are connected by a U-shaped tube. The U-shaped tube straddles the outside of the leg to form a bridging structure 4

[0015] Actual on-site manufacturing process

[0016] The outrigger 3 is composed of I-beams. The I-beam outriggers are evenly distributed and welded on the outer wall of the reactor body 1. Several φ108 semi-circular pipe jackets are welded on the outer wall of the vertical reactor body 1 in a spiral shape. The spiral semi-circular pipe jacket passing through the outrigger 3 stops welding at a distance of 10 cm from the outrigger, and then spiral welding is restarted at the other end of the outrigger 3. After the spiral welding of the semi-circular pipe jacket is completed, the semi-circular pipes on both sides of the outrigger 3 are connected. Specifically: (1) The semi-circular pipe jackets on both sides of the outrigger are welded and sealed with steel plates, and then holes are drilled on the semi-circular pipe bodies on both sides of the outrigger; (2) Two seamless steel pipes with a diameter of φ89 and a length of 35 cm are respectively welded on the round holes of the semi-circular pipes on both sides of the outrigger, and the seamless steel pipes are perpendicular to the semi-circular pipe jackets; (3) One end of the two φ89 seamless steel pipes is welded on the semi-circular pipe jacket, and the other end is welded with two 45° elbows with a diameter of DN80; (4) The other ends of the two 45° elbows are welded with a section of φ89 seamless steel pipe to be connected, forming a bridging structure to bridge the outrigger. During maintenance, the bridging structure can be directly repaired, which is simple in operation, time-saving and labor-saving.

[0017] Finally, it should be noted that the above-listed are only the preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. If these modifications and variations fall within the scope of the claims of the present invention and its equivalent technologies, they should be considered as within the protection scope of the present invention.

Claims

1. A jacket structure for a polyvinyl chloride resin reactor, comprising a reactor body, a jacket is arranged on the side wall of the reactor body, and legs are evenly distributed at the lower end of the reactor body; characterized in that: The inner side of the supporting leg is fixedly connected to the side wall of the reactor body, and the jackets on both sides of the supporting leg are spanned over the supporting leg in a bridging structure.

2. The jacket structure of the polyvinyl chloride resin reactor according to claim 1, characterized in that: The ends of each layer of jacket on both sides of the supporting leg are blocked respectively, and connecting holes are opened on the jacket pipe wall outside the blocked end. The two connecting holes are connected by a U-shaped pipe to form a bridging structure to bridge the supporting leg.

3. The jacket structure of the polyvinyl chloride resin reactor according to claim 1, characterized in that: The U-tube is a seamless steel tube.

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