distributor mounting structure for phenylethanol vaporizer

Abstract

This utility model provides a distributor installation structure for a phenylethanol vaporizer, which ensures that liquid phenylethanol is reliably diffused into the area where the heat exchange tubes are arranged, thus ensuring reliable vaporization of phenylethanol. Its features include: a horizontally arranged preheating vaporization cylinder; the preheating vaporization cylinder includes a first tube box, a tube sheet, and a first cylinder body; the tube sheet is installed between the opposing ends of the first tube box and the first cylinder body and fixed by a flange structure; several inlets are arranged sequentially at intervals along the length direction at the bottom of the first cylinder body; a large-diameter sleeve outlet is provided at the top of the first cylinder body; U-shaped heat exchange tube assemblies are arranged inside the preheating vaporization cylinder body, and the U-shaped heat exchange tube assemblies include multiple sets of U-shaped heat exchange tubes; the several inlets include liquid inlets and gas inlets; the liquid inlets directly introduce room-temperature liquid phenylethanol, and the gas inlets introduce gaseous phenylethanol that has been vaporized at high temperature; a distribution plate is arranged on the area corresponding to the length region of all inlets.

Description

Technical Field

[0001] This utility model relates to the technical field of phenylethanol vaporization, specifically to the distributor installation structure of a phenylethanol vaporizer. Background Technology

[0002] Propylene oxide (PO) is an important organic chemical raw material, widely used in polyurethane, unsaturated polyester resins, and other fields. Styrene (SM) is also an important basic organic raw material, with extensive applications in synthetic rubber, engineering plastics, and other areas. The PO / SM co-production process, as an advanced production technology, combines the production of styrene and propylene oxide through a co-oxidation method, achieving efficient resource utilization and cost reduction. In the PO / SM co-production process, ethylbenzene peroxidation produces ethylbenzene peroxide, which then reacts with propylene to produce propylene oxide and phenethyl alcohol. The dehydration reaction of phenethyl alcohol is a key step in the preparation of styrene. Currently, phenethyl alcohol dehydration is mainly carried out through gas-phase dehydration. The gas-phase dehydration reaction of phenethyl alcohol occurs under certain temperature and catalyst conditions, where phenethyl alcohol undergoes intramolecular dehydration to produce styrene and water. The reaction equation is as follows: The reaction takes place under gas-phase conditions, and solid acid catalysts, such as molecular sieves and alumina, are generally used. However, in existing phenylethanol vaporizers, liquid phenylethanol enters the cylinder through an inlet during vaporization. After gaining energy through heat exchange tubes, the liquid phenylethanol vaporizes and flows out from the upper gas outlet. During this process, the flow of liquid phenylethanol cannot reliably and evenly cover the surface of the corresponding heat exchange tubes of the arranged heat exchangers. Consequently, some liquid phenylethanol, due to insufficient heat exchange, directly enters the reactor in liquid form, resulting in residual liquid phenylethanol in the catalytic reactor. This directly causes the originally preset catalytic reaction yield to fall below the preset level. Therefore, how to prevent liquid phenylethanol from entering the catalytic reactor is an urgent technical problem to be solved. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a distributor installation structure for a phenylethanol vaporizer, which ensures that liquid phenylethanol is reliably diffused into the area where the heat exchange tubes are arranged, thereby ensuring reliable vaporization of phenylethanol and minimizing or eliminating liquid entry into the catalytic reactor.

[0004] The distributor mounting structure of the phenylethanol vaporizer is characterized in that it includes a horizontally arranged preheating vaporization cylinder.

[0005] The preheating vaporization cylinder includes a first tube box, a tube sheet, and a first cylinder. The first tube box includes a medium input cavity and a medium output cavity for the inflow and outflow of high-temperature medium. The tube sheet is installed between the opposing ends of the first tube box and the first cylinder and is fixed by a flange structure. U-shaped heat exchange tube through holes are arranged on the tube sheet. Several feed ports are arranged sequentially at intervals along the length direction at the bottom of the first cylinder. The top of the first cylinder is provided with an upwardly protruding large-diameter sleeve discharge port. The bottom of the first cylinder is provided with a drain port corresponding to the far end of the first tube box.

[0006] The preheating vaporization cylinder is equipped with a U-shaped heat exchange tube assembly, which includes multiple sets of U-shaped heat exchange tubes.

[0007] The feed inlets include a liquid feed inlet and a gas feed inlet. The liquid feed inlet directly introduces room temperature liquid phenylethanol, and the gas feed inlet introduces gaseous phenylethanol that has been vaporized at high temperature.

[0008] Distribution plates are arranged on the surface area corresponding to the length region of all inlets. The distribution plates are located below the U-shaped heat exchange tube at the lowest position. The distribution plates have a mesh structure. The distribution plates uniformly mix liquid phenylethanol and gaseous phenylethanol and then pass them through the heat exchange section of the upper U-shaped heat exchange tube.

[0009] Its further features are:

[0010] The number of feed ports is five, which are arranged sequentially along the bottom length of the first cylinder in the order of first liquid feed port, first gas feed port, second liquid feed port, second gas feed port and third liquid feed port. The liquid inlet diameter is larger than the gas inlet diameter. The gas phase phenylethanol is used to drive the liquid phase phenylethanol to be evenly dispersed to the heat exchange end of the U-shaped heat exchange tube to ensure sufficient vaporization and heat exchange of the liquid phase phenylethanol.

[0011] The inlet end of each U-shaped heat exchange tube is located in the medium inlet cavity of the first tube box, and the outlet end of each U-shaped heat exchange tube is located in the medium outlet cavity of the first tube box. The heat exchange sections of the U-shaped heat exchange tubes are distributed in the area above several feed inlets.

[0012] The distribution plate includes a flat plate portion, vertical connecting plates at both ends, and side strips on both sides. The bottom of the vertical connecting plates is arranged in the shape of the inner wall of the first cylinder. The bottom of the vertical connecting plates at both ends is welded to the corresponding position of the lower inner wall of the first cylinder. The bottom of the side strips is welded to the lower inner wall of the first cylinder. The flat plate portion is laid flat along the length direction. The flat plate portion is located directly above all the feed inlets and completely covers the surface area of ​​all the feed inlets. The flat plate portion is evenly distributed with mesh holes.

[0013] The plate portion is 80-100 mm higher than all feed ports, which ensures that liquid phenylethanol and gaseous phenylethanol are mixed uniformly.

[0014] The U-shaped heat exchange tubes of the U-shaped heat exchange tube assembly are provided with several spaced support plates at their straight extension positions. Each support plate is provided with corresponding through holes for the passage of the U-shaped heat exchange tubes. The bottom of the support plate is provided with a clearance groove corresponding to the area of ​​the distribution plate.

[0015] The rear of the last support plate is also equipped with a tube bundle fixing device, which is set at the bend end of the tube bundle of the U-shaped heat exchange tube group to provide downward restraint force, firmly fix the tube bundle in the design position, and prevent it from being lifted, detached from the support or displaced.

[0016] After adopting the above technical solution, several feed ports are arranged sequentially at intervals along the length of the bottom of the first cylinder. Liquid phenylethanol and gaseous phenylethanol are fed in through the corresponding feed ports, which makes the feed dispersed into the cavity. Then, the liquid phenylethanol and gaseous phenylethanol are uniformly mixed by the distribution plate and then passed through the heat exchange section of the upper U-shaped heat exchange tube. This makes the liquid phenylethanol reliably diffused into the area where the heat exchange tube is arranged, ensuring that the phenylethanol is reliably vaporized and ensuring that little or no liquid enters the catalytic reactor. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention;

[0018] Figure 2 This is a side view of the present invention;

[0019] Figure 3 for Figure 1 Sectional view along axis AA;

[0020] The names corresponding to the serial numbers in the diagram are as follows:

[0021] Preheating vaporization cylinder 100;

[0022] First tube box 10, medium input cavity 11, medium output cavity 12, transverse partition 13, medium input interface 14, medium output interface 15, tube sheet 20, first cylinder 30, large diameter sleeve outlet 31, drain port 32, first liquid inlet 33, first gas inlet 34, second liquid inlet 35, second gas inlet 36, third liquid inlet 37, saddle 38, U-shaped heat exchange tube assembly 40, U-shaped heat exchange tube 41, distribution plate 50, flat plate part 51, vertical connecting plate 52, side strip 53, tube bundle fixing device 60, support plate 61, through hole 611, clearance groove 612. Detailed Implementation

[0023] See the distributor installation structure of the phenylethanol vaporizer. Figures 1-3 It includes a horizontally arranged preheating vaporization cylinder 100;

[0024] The preheating vaporization cylinder 100 includes a first tube box 10, a tube sheet 20, and a first cylinder 30. The first tube box 10 includes a medium input cavity 11 and a medium output cavity 12 for the inflow and outflow of high-temperature medium. The tube sheet 20 is arranged between the opposing ends of the first tube box 10 and the first cylinder 30 and is fixed by a flange structure. U-shaped heat exchange tube through holes are arranged on the tube sheet 20. Several feed ports are arranged sequentially at intervals along the length direction at the bottom of the first cylinder 30. The top of the first cylinder 30 is provided with an upwardly protruding large-diameter sleeve discharge port 31. The bottom of the first cylinder 30 is provided with a drain port 32 corresponding to the far end of the first tube box.

[0025] The preheating vaporization cylinder 100 is equipped with a U-shaped heat exchange tube assembly 40, which includes multiple sets of U-shaped heat exchange tubes 41.

[0026] Several feed ports include a liquid feed port and a gas feed port. The liquid feed port directly introduces room temperature liquid phenylethanol, and the gas feed port introduces gaseous phenylethanol that has been vaporized at high temperature.

[0027] Distribution plates 50 are arranged on the surface area corresponding to the length region of all inlets. The distribution plates 50 are located below the U-shaped heat exchange tube 41 at the lowest position. The distribution plates 50 have a mesh structure. The distribution plates 50 uniformly mix the liquid phenylethanol and gaseous phenylethanol and then pass them through the heat exchange section of the upper U-shaped heat exchange tube 41.

[0028] In a specific embodiment, there are five inlets, which are arranged sequentially along the bottom length of the first cylinder 30 in the order of first liquid inlet 33, first gas inlet 34, second liquid inlet 35, second gas inlet 36, and third liquid inlet 37. The liquid inlet diameter is larger than the gas inlet diameter. The gas phase phenylethanol is used to drive the liquid phase phenylethanol to be evenly dispersed to the heat exchange end of the U-shaped heat exchange tube 41 to ensure sufficient vaporization and heat exchange of the liquid phase phenylethanol.

[0029] The input end of each U-shaped heat exchange tube 41 is located in the medium input cavity 11 of the first tube box 10, and the output end of each U-shaped heat exchange tube 41 is located in the medium output cavity 12 of the first tube box 10. The heat exchange sections of the U-shaped heat exchange tube 41 are distributed in the area above several feed inlets.

[0030] In specific implementation, the distribution plate 50 includes a flat plate portion 51, vertical connecting plates 52 located at both ends, and side strips 53 located on both sides. The bottom of the vertical connecting plates 52 is arranged in the shape of the inner wall of the first cylinder 30. The bottom of the vertical connecting plates 52 located at both ends is welded to the corresponding position of the lower inner wall of the first cylinder 30. The bottom of the side strips 53 is welded to the lower inner wall of the first cylinder 30. The flat plate portion 51 is laid flat along the length direction. The flat plate portion 51 is located directly above all the feed inlets and completely covers the surface area of ​​all the feed inlets. The flat plate portion 51 is evenly distributed with mesh holes.

[0031] The plate section 51 is 80-100mm higher than all inlets, which ensures that liquid phenylethanol and gaseous phenylethanol are mixed evenly.

[0032] In specific implementation, a number of spaced support plates 61 are arranged at the straight extension positions of the U-shaped heat exchange tube 41 of the U-shaped heat exchange tube group 40. Each support plate 61 has a corresponding through hole 611. The bottom of the support plate 61 is provided with an avoidance groove 612 corresponding to the area of ​​the distribution plate 50.

[0033] The rear of the last support plate 61 is also provided with a tube bundle fixing device 60, which is set at the bend end of the tube bundle of the U-shaped heat exchange tube group 40 to provide downward restraint force, firmly fix the tube bundle in the design position, and prevent it from being lifted, detached from the support or displaced.

[0034] In specific implementation, the first tube box 10 is divided into a medium input chamber 11 and a medium output chamber 12 by a transverse partition 13. The medium input chamber 11 is provided with a medium input interface 14, and the medium output chamber 12 is provided with a medium output interface 15.

[0035] The bottom of both ends of the first cylinder 30 along its length is provided with saddles 38, which facilitates the reliable placement of the entire vaporizer.

[0036] Its working principle is as follows: Several feed ports are arranged sequentially at intervals along the length of the bottom of the first cylinder. Liquid phenylethanol and gaseous phenylethanol are fed in through the corresponding feed ports, which makes the feed dispersed into the cavity. Then, the liquid phenylethanol and gaseous phenylethanol are uniformly mixed by the distribution plate and then passed through the heat exchange section of the upper U-shaped heat exchange tube. This makes the liquid phenylethanol reliably diffused into the area where the heat exchange tube is arranged, ensuring that phenylethanol is reliably vaporized and ensuring that little or no liquid enters the catalytic reactor.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A distributor mounting structure for a phenylethanol vaporizer, characterized in that: It includes a horizontally arranged preheating vaporization cylinder; The preheating vaporization cylinder includes a first tube box, a tube sheet, and a first cylinder. The first tube box includes a medium input cavity and a medium output cavity for the inflow and outflow of high-temperature medium. The tube sheet is installed between the opposing ends of the first tube box and the first cylinder and is fixed by a flange structure. U-shaped heat exchange tube through holes are arranged on the tube sheet. Several feed ports are arranged sequentially at intervals along the length direction at the bottom of the first cylinder. The top of the first cylinder is provided with an upwardly protruding large-diameter sleeve discharge port. The bottom of the first cylinder is provided with a drain port corresponding to the far end of the first tube box. The preheating vaporization cylinder is equipped with a U-shaped heat exchange tube assembly, which includes multiple sets of U-shaped heat exchange tubes. The feed inlets include a liquid feed inlet and a gas feed inlet. The liquid feed inlet directly introduces room temperature liquid phenylethanol, and the gas feed inlet introduces gaseous phenylethanol that has been vaporized at high temperature. Distribution plates are arranged on the surface area corresponding to the length region of all inlets. The distribution plates are located below the U-shaped heat exchange tube at the lowest position. The distribution plates have a mesh structure. The distribution plates uniformly mix liquid phenylethanol and gaseous phenylethanol and then pass them through the heat exchange section of the upper U-shaped heat exchange tube.

2. The distributor mounting structure for the phenylethanol vaporizer according to claim 1, characterized in that: The number of feed inlets is five, which are arranged sequentially along the bottom length of the first cylinder in the order of first liquid feed inlet, first gas feed inlet, second liquid feed inlet, second gas feed inlet, and third liquid feed inlet. The liquid inlet diameter is larger than the gas inlet diameter.

3. The distributor mounting structure for the phenylethanol vaporizer according to claim 2, characterized in that: The inlet end of each U-shaped heat exchange tube is located in the medium inlet cavity of the first tube box, and the outlet end of each U-shaped heat exchange tube is located in the medium outlet cavity of the first tube box. The heat exchange sections of the U-shaped heat exchange tubes are distributed in the area above several feed inlets.

4. The distributor mounting structure for the phenylethanol vaporizer according to claim 2, characterized in that: The distribution plate includes a flat plate portion, vertical connecting plates at both ends, and side strips on both sides. The bottom of the vertical connecting plates is arranged in the shape of the inner wall of the first cylinder. The bottom of the vertical connecting plates at both ends is welded to the corresponding position of the lower inner wall of the first cylinder. The bottom of the side strips is welded to the lower inner wall of the first cylinder. The flat plate portion is laid flat along the length direction. The flat plate portion is located directly above all the feed inlets and completely covers the surface area of ​​all the feed inlets. The flat plate portion is evenly distributed with mesh holes.

5. The distributor mounting structure for the phenylethanol vaporizer according to claim 4, characterized in that: The flat plate portion is 80-100mm higher than all feed inlets.

6. The distributor mounting structure for the phenylethanol vaporizer according to claim 4, characterized in that: The U-shaped heat exchange tubes of the U-shaped heat exchange tube assembly are provided with several spaced support plates at their straight extension positions. Each support plate has corresponding through holes, and the bottom of the support plate has a clearance groove corresponding to the area of ​​the distribution plate.

7. The distributor mounting structure for the phenylethanol vaporizer according to claim 6, characterized in that: The rear of the last support plate is also equipped with a tube bundle fixing device, which is installed at the bend end of the tube bundle of the U-shaped heat exchanger tube assembly.

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