Structure for reducing corrosion and scouring of bayonet tube reactor

Abstract

The utility model relates to the technical field of bayonet tube reactors, in particular to a corrosion and erosion reducing structure of a bayonet tube reactor, which comprises a barrel, a central tube, a tube bundle and an emptying tube, an emptying port communicated with the inside and the outside is arranged on the lower portion of the barrel, the central tube is arranged in the middle of the barrel, and the upper portion of the tube bundle is positioned in the barrel. The tube bundle comprises a plurality of bayonet tubes arranged along the circumference and at least two supporting plates for fixing the bayonet tubes, an emptying tube is fixedly installed on the inner side of the lower portion of the cylinder and is in a semicircular shape with a leftward opening, and the lower end of the emptying tube is open and the upper end of the emptying tube is closed. The device is reasonable and compact in structure and convenient to use, and the blocking structure is arranged to block the gap between the rectangular groove and the inner side of the cylinder body, so that materials flow between the bayonet tubes in the tube bundle to be heated; and the problem that the service life of the bayonet tube reactor is greatly shortened due to the fact that materials severely wash the cylinder wall and the bayonet tube located at the position when flowing at a large gap between the rectangular groove and the inner side of the cylinder is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bayonet tube reactors, in particular to a bayonet tube reactor structure for reducing corrosion and erosion. Background Art

[0002] At present, the bayonet tube reactor has a vertical structure, a design pressure of 10.5MPa, a design temperature of 480℃, an upper spherical head welded to the cylinder, a heat exchange shell in the middle, and a bayonet tube bundle inside. The material flows from bottom to top through the bayonet tube to heat the material. The lower 530mm thick tube sheet is connected to the cylinder flange through 32 M100*935 hydraulic stud bolts. The bottom is the hot medium molten salt pipe box (such as the attached Figure 1 As shown). Considering that the thickness of the cylinder flange is 420mm, the height of the bayonet tube reactor's emptying port from the lower end of the cylinder is 680mm. Therefore, when emptying, the bottom of the cylinder cannot be naturally discharged. In order to completely discharge the materials of the bayonet tube reactor, a semicircular tube (fully welded) is buckled at the emptying port on the inner wall of the cylinder of the bayonet tube reactor. It is an emptying pipe with a height of 705mm and a distance of 50mm from the sealing surface of the flange at the bottom of the cylinder. The semicircular is sealed with a semicircular plate at the top of the emptying pipe (fully welded). When the bottom material is emptied, a pipeline is connected to the outside of the emptying port. Through the siphon principle, the liquid is discharged from the emptying pipe and the emptying port. However, when disassembling and assembling, the bolts at the flange position are removed, and the tube bundle, thick tube sheet, and hot medium molten salt tube box are moved downward from the bottom of the cylinder as a whole. The tube bundle is removed from the cylinder for cleaning. After cleaning, the tube bundle is loaded upward from the lower end of the cylinder. In order to avoid the drain pipe and facilitate installation, rectangular grooves are provided on all support plates of the tube bundle. The longitudinal gaps from the top of the drain pipe to the top of the bayonet tube are connected, so the material will flow upward from there. The gap is large, so the material flow is large, causing serious scouring of the cylinder wall and the outer wall of the bayonet tube at this place, and the material flowing upward from this place does not fully contact the bayonet tube, resulting in uneven temperature rise, which also affects the heating of the material. The bayonet tube reactor is normally used for more than 10 years, but at present, due to severe scouring, the tube bundle, hot medium molten salt tube box, etc. need to be replaced within less than four years of use, and the replacement cost is about 30 million. Therefore, the scouring problem greatly shortens the service life of the tube bundle and increases production costs. Summary of the invention

[0003] The utility model provides a bayonet tube reactor corrosion scouring reducing structure, which overcomes the above-mentioned shortcomings of the prior art and can effectively solve the problem that the service life of the bayonet tube reactor is greatly shortened due to the scouring of materials at the rectangular groove position in the existing bayonet tube reactor.

[0004] The technical scheme of the utility model is achieved through the following measures: a bayonet tube reactor structure for reducing corrosion and erosion, comprising a cylinder, a central tube, a tube bundle, and an emptying pipe, wherein the lower part of the cylinder is provided with an emptying port communicating with the inside and outside, the middle part of the cylinder is provided with a central tube, the upper part of the tube bundle is located in the cylinder, and the tube bundle is located outside the central tube, the tube bundle comprises a plurality of bayonet tubes arranged along the circumference and at least two support plates for fixing the bayonet tubes, an emptying pipe is fixedly installed on the inner side of the lower part of the cylinder, the emptying pipe is in a semicircular shape with an opening to the left, the lower end of the emptying pipe is open and the upper end is closed, and a rectangular groove penetrating from top to bottom is provided on each support plate corresponding to the position of the emptying pipe, the rectangular groove can allow the emptying pipe to pass through when the tube bundle is disassembled from the lower end of the cylinder, and a blocking structure is provided in the cylinder that can block the gap between the rectangular groove and the inner side of the cylinder and does not affect the passage of the emptying pipe.

[0005] The following are further optimizations and / or improvements to the above utility model technical solution:

[0006] Preferably, the blocking structure is a blocking tube, which is welded to the inner side of the cylinder corresponding to the position of the emptying tube. The upper end of the blocking tube is at the same height as the upper end of the bayonet tube, the blocking tube has the same shape as the emptying tube, and the blocking tube passes through four rectangular grooves.

[0007] Preferably, the plugging tube is welded to the inner side of the cylinder body by intermittent welding, the upper end of the plugging tube is open, and the lower end of the plugging tube is welded to the outer side of the upper end of the draining tube.

[0008] Preferably, the inner side of each rectangular groove is filled into a semicircular groove, and the gap between the semicircular groove and the blocking tube is 3 mm to 5 mm.

[0009] Preferably, the blocking tube is made of the same material as the barrel.

[0010] The utility model has a reasonable and compact structure and is easy to use. By arranging a blocking structure to block the gap between the rectangular groove and the inner side of the cylinder, the material is allowed to flow and be heated between the bayonet tubes in the tube bundle, thereby avoiding the problem that the gap between the rectangular groove and the inner side of the cylinder is large, causing the material to scour the cylinder wall and the bayonet tubes located there when flowing there, thereby greatly shortening the service life of the bayonet tube reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 This is a schematic diagram of the main cross-sectional structure of the vertical structure of the bayonet tube reactor.

[0012] Attached Figure 2 It is a schematic diagram of the main cross-sectional structure of the utility model.

[0013] Attached Figure 3 For attachment Figure 2 Schematic diagram of the top view of the middle tube bundle.

[0014] The codes in the attached drawings are: 1 is a cylinder, 2 is a bayonet tube, 3 is a thick tube plate, 4 is a flange, 5 is a heat medium molten salt tube box, 6 is an exhaust port, 7 is an exhaust pipe, 8 is a center tube, 9 is a rectangular groove, 10 is a plugging tube, and 11 is a support plate. DETAILED DESCRIPTION

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0017] The present invention is further described below in conjunction with the embodiments and drawings:

[0018] Embodiment 1: As attached Figure 2 , 3 As shown, the bayonet tube reactor corrosion erosion reduction structure includes a cylinder 1, a central tube 8, a tube bundle, and an emptying pipe 7. The lower part of the cylinder 1 is provided with an emptying port 6 that is connected to the inside and outside, and the middle part of the cylinder 1 is provided with a central tube 8. The upper part of the tube bundle is located inside the cylinder 1, and the tube bundle is located outside the central tube 8. The tube bundle includes a plurality of bayonet tubes 2 arranged along the circumference and at least two support plates 11 for fixing the bayonet tubes 2. An emptying pipe 7 is fixedly installed on the inner side of the lower part of the cylinder 1. The emptying pipe 7 is in a semicircular shape with an opening to the left, and the lower end of the emptying pipe 7 is open and the upper end is closed. A rectangular groove 9 that passes through from top to bottom is provided on each support plate 11 corresponding to the position of the emptying pipe 7. The rectangular groove 9 can allow the emptying pipe 7 to pass through when the tube bundle is disassembled from the lower end of the cylinder 1. A sealing structure is provided in the cylinder 1, which can block the gap between the rectangular groove 9 and the inner side of the cylinder 1 without affecting the passage of the emptying pipe 7.

[0019] The utility model has a reasonable and compact structure and is easy to use. It blocks the gap between the rectangular groove 9 and the inner side of the cylinder 1 by setting a blocking structure, forcing the material to flow between the bayonet tubes 2 in the tube bundle and heat evenly, thereby avoiding the problem that the gap between the rectangular groove 9 and the inner side of the cylinder 1 is large and the material flow is large, resulting in the serious scouring of the cylinder wall and the bayonet tube 2 located there when the material flows there, greatly shortening the service life of the bayonet tube reactor. The utility model can extend the service life of the tube bundle, reduce the replacement frequency, and reduce production costs.

[0020] According to actual needs, the above-mentioned bayonet tube reactor structure for reducing corrosion and erosion can be further optimized and / or improved:

[0021] Embodiment 2: As attached Figure 2 , 3As shown, the blocking structure is a blocking tube 10, and a blocking tube 10 is welded on the inner side of the cylinder 1 corresponding to the position of the emptying pipe 7, the upper end of the blocking tube 10 is at the same height as the upper end of the bayonet tube 2, the blocking tube 10 is the same shape as the emptying pipe 7, and the blocking tube 10 passes through four rectangular slots 9. By setting the blocking tube 10, the longitudinal gap above the emptying pipe 7 can be completely blocked, and a guiding effect can be provided during installation.

[0022] Embodiment 3: As attached Figure 2 , 3 As shown, the plugging tube 10 is welded to the inner side of the cylinder 1 by intermittent welding, the upper end of the plugging tube 10 is open, and the lower end of the plugging tube 10 is welded to the outer side of the upper end of the emptying pipe 7. The plugging tube 10 and the cylinder 1 are fixed by intermittent welding, and the upper end of the plugging tube 10 is opened, which is simpler. There is a gap between the plugging tube 10 and the cylinder 1, so that the material entering the plugging tube 10 can be discharged.

[0023] Embodiment 4: As attached Figure 2 , 3 As shown, the inner side of each rectangular groove 9 is filled into a semicircular groove, and the gap between the semicircular groove and the plugging tube 10 is 3mm to 5mm. By setting it in this way, the gap between the plugging tube 10 and the inner side of the rectangular groove 9 is reduced, the passage of materials is reduced and it is easy to install.

[0024] Embodiment 5: As attached Figure 2 , 3 As shown, the plugging tube 10 is made of the same material as the cylinder 1. By using the same material as the cylinder 1, the problem of weld cracking caused by different thermal expansion and contraction of the materials can be avoided.

[0025] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A bayonet tube reactor to reduce corrosion and erosion structure, characterized in that It includes a cylinder body, a central tube, a tube bundle, and an emptying pipe. The lower part of the cylinder body is provided with an emptying port connected inside and outside, the middle part of the cylinder body is provided with a central tube, the upper part of the tube bundle is located in the cylinder body, and the tube bundle is located outside the central tube. The tube bundle includes a plurality of bayonet tubes arranged along the circumference and at least two support plates for fixing the bayonet tubes. An emptying pipe is fixedly installed on the inner side of the lower part of the cylinder body. The emptying pipe is in a semicircular shape with an opening facing left. The lower end of the emptying pipe is open and the upper end is closed. A rectangular groove penetrating from top to bottom is provided on each support plate corresponding to the position of the emptying pipe. The rectangular groove can allow the emptying pipe to pass through when the tube bundle is disassembled and assembled from the lower end of the cylinder body. A sealing structure is provided in the cylinder body, which can block the gap between the rectangular groove and the inner side of the cylinder body without affecting the passage of the emptying pipe.

2. The bayonet tube reactor corrosion erosion reduction structure according to claim 1, characterized in that The blocking structure is a blocking pipe, which is welded on the inner side of the cylinder corresponding to the position of the emptying pipe. The upper end of the blocking pipe is at the same height as the upper end of the bayonet pipe. The blocking pipe has the same shape as the emptying pipe, and the blocking pipe passes through four rectangular grooves.

3. The bayonet tube reactor corrosion erosion reduction structure according to claim 1 or 2, characterized in that The plugging pipe is welded to the inner side of the cylinder by intermittent welding. The upper end of the plugging pipe is open, and the lower end of the plugging pipe is welded to the outer side of the upper end of the drain pipe.

4. The bayonet tube reactor corrosion erosion reduction structure according to claim 1 or 2, characterized in that The inner side of each rectangular groove is filled into a semicircular groove, and the gap between the semicircular groove and the plugging tube is 3mm to 5mm.

5. The bayonet tube reactor corrosion erosion reduction structure according to claim 3, characterized in that The inner side of each rectangular groove is filled into a semicircular groove, and the gap between the semicircular groove and the plugging tube is 3mm to 5mm.

6. The bayonet tube reactor corrosion erosion reduction structure according to claim 1, 2 or 5, characterized in that The plugging tube is made of the same material as the cylinder.

7. The bayonet tube reactor corrosion erosion reduction structure according to claim 3, characterized in that The plugging tube is made of the same material as the cylinder.

8. The bayonet tube reactor corrosion erosion reduction structure according to claim 4, characterized in that The plugging tube is made of the same material as the cylinder.

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