Styrene production efficient heat exchange device capable of automatically descaling

Abstract

The utility model belongs to the technical field of corollary equipment for styrene production, and particularly relates to an efficient heat exchange device for styrene production, which can automatically descale and comprises a shell, a left sealing plate is arranged at the left end of the shell, a right sealing plate is arranged at the right end of the shell, a plurality of heat exchange tubes are distributed in an inner cavity of the shell, and one end of each heat exchange tube is communicated with the left sealing plate in a sealing mode. A scraping plate is arranged in an inner cavity of the shell, penetrating holes are formed in the scraping plate in a one-to-one correspondence mode with the heat exchange pipes, the heat exchange pipes are arranged in the corresponding penetrating holes in a matched and penetrating mode, and the scraping plate can be arranged on the heat exchange pipes in a matched and sleeved mode and make contact with the heat exchange pipes in a matched and sliding mode in a reciprocating mode; the right water inlet channel communicates with the left plate face of the right sealing plate from the outer surface of the right sealing plate and communicates with the inner cavity of the shell.

Description

Technical Field

[0001] The utility model belongs to the technical field of styrene production supporting equipment, and particularly relates to a high-efficiency heat exchange device for styrene production which can automatically remove scale. Background Art

[0002] The industrial production of styrene is to use benzene and ethylene as raw materials to first undergo an alkylation reaction under certain conditions to produce ethylbenzene, and then dehydrogenate the ethylbenzene under certain conditions. After the dehydrogenation product is cooled, it is separated from oil and water to obtain styrene. Since styrene will undergo polymerization at high temperatures, the produced styrene needs to be quickly cooled down through a heat exchanger in a timely manner. At present, after many heat exchangers have been running for a long time, the surface of the heat transfer tubes in the heat exchanger will be covered with a layer of scale. The scale will reduce the heat exchange efficiency between the heat transfer tube and the coolant, thereby increasing the risk of styrene polymerization. Summary of the invention

[0003] In order to solve the above technical problems, the utility model provides a high-efficiency heat exchange device for styrene production with automatic descaling, comprising a cylindrical shell, the inner cavity of the shell is in the shape of a regular cylinder with the axial direction being horizontal in the left and right directions, and is coaxially arranged with the shell, the left end of the shell is provided with a left sealing plate with a vertical plate surface for forming a seal with the left port of the inner cavity of the shell, and the right end of the shell is provided with a right sealing plate with a vertical plate surface for forming a seal with the right port of the inner cavity of the shell,

[0004] A hemispherical left cover body coaxially arranged with the shell body is provided on the left side of the shell body, and the hemispherical left cover body is sealed and covered on the left sealing plate outside the shell body, so as to surround and form a left cavity on the left sealing plate, and a feeding pipe coaxially arranged with the hemispherical left cover body is sealed and connected to the hemispherical left cover body along its own axial level to the right and is further connected to the left cavity; a hemispherical right cover body coaxially arranged with the shell body is provided on the right side of the shell body, and the hemispherical right cover body is sealed and covered on the right sealing plate outside the shell body, so as to surround and form a right cavity on the right sealing plate, and a discharging pipe coaxially arranged with the hemispherical right cover body is sealed and connected to the hemispherical right cover body along its own axial level to the left and is further connected to the right cavity.

[0005] A water inlet connecting the inner cavity of the shell and the outside is provided at the top right of the shell, and a first channel is independently provided in the left sealing plate. The first channel extends vertically upward and then horizontally to the right from the bottom of the left sealing plate edge along its own transmission direction and is connected to the right plate surface of the left sealing plate (close to the bottom of the inner cavity of the shell), thereby communicating with the inner cavity of the shell.

[0006] Several heat exchange tubes with lengths in the horizontal direction are evenly distributed in the inner cavity of the shell. The left end of the heat exchange tube is sealed through the left sealing plate and connected to the left cavity; the right end of the heat exchange tube is sealed through the right sealing plate and connected to the right cavity.

[0007] A scraper with a vertical plate surface is coaxially embedded in the inner cavity of the shell. A plurality of through holes with axial directions horizontal to the left and right and connecting the left and right plate surfaces of the scraper are opened on the scraper corresponding to the heat exchange tubes one by one. The heat exchange tubes are coaxially inserted into the corresponding through holes. The scraper is located between the water inlet and the right sealing plate in the horizontal direction. The scraper can be coaxially fitted in the inner cavity of the shell and sleeved to contact each heat exchange tube for reciprocating sliding.

[0008] A second channel is independently opened in the right sealing plate. The second channel extends vertically downward from the top of the edge of the right sealing plate along its own transmission direction, then extends horizontally to the left and is connected to the left plate surface of the right sealing plate (at the same time, away from the bottom and top of the inner cavity of the shell), thereby communicating with the inner cavity of the shell.

[0009] The beneficial effect of this scheme is that: when the heat exchange device is in normal heat exchange operation, the second channel remains closed, and the material containing the product styrene enters the left cavity, each heat exchange tube, and the right cavity from the feed pipe from left to right, and finally leaves through the discharge pipe; at the same time, after the cooling water enters the shell through the water inlet, it flows from right to left in the inner cavity of the shell to exchange heat with the materials in each heat exchange tube to cool the materials, and finally leaves the shell from the first channel and enters the collection pool (not drawn in the attached figure) for recycling. After working for a long time, a layer of scale will be covered on the surface of the heat exchange tube, which reduces the heat exchange efficiency between the material in the heat exchange tube and the cooling water flowing in the shell.

[0010] In this regard, in this solution, a scraper is provided in the inner cavity of the shell. The scraper is located between the water inlet and the right sealing plate in the horizontal direction. When the device is in normal heat exchange operation, the water inlet continuously injects water into the inner cavity of the shell. Figure 1 As shown, the water pressure of the water injection will continuously make the scraper close to or even parallel to the right inner cavity wall (right sealing plate) of the shell;

[0011] When it is necessary to clean the scale on the surface of the heat exchange tube, close the water inlet (at this time, the outside of the heat exchange tube in the shell cavity is filled with water), open the second channel, and inject water into the shell cavity through the second channel, so that the water storage on the right side of the scraper in the shell gradually increases, thereby squeezing the scraper to the left, so that the scraper cooperates with the shell cavity to slide from right to left, as shown in the attached figure. Figure 3 , since the scraper is also coaxially sleeved on each heat exchange tube, the scraper scrapes the scale on the surface of each heat exchange tube into the accumulated water (in the space on the left side of the scraper) through the perforated edges on the left plate surface during the sliding process, and is pushed out of the shell through the first channel together with the accumulated water by the scraper (for this part of the outflowing water with a high scale content, it can be collected and discharged separately to avoid it from entering the collection pool), until the scraper is sufficiently close to the left inner cavity wall (left sealing plate) of the shell, as shown in the attached figure. Figure 4The first channel is connected to the left inner cavity wall of the shell, that is, the water outlet of the shell is set on the left inner cavity wall thereof, which can avoid the accumulation of water between the left cavity wall of the shell and the scraper and prevent it from flowing out and hindering the scraper, so that the scraper can be sufficiently close to the left cavity wall of the shell during the above sliding, so that the entire surface of the heat exchange tube is basically scraped by the scraper;

[0012] At this time, stop injecting water into the shell through the second channel, and instead inject water into the shell through the first channel to push the scraper to slide rightward in cooperation with the inner cavity of the shell (during this process, the accumulated water on the right side of the scraper in the inner cavity of the shell is discharged through the second channel in turn), until the scraper returns to its initial position, that is, sufficiently close to the right inner cavity wall of the shell, so that normal heat exchange based on the water inlet and the first channel can continue normally. Then stop injecting water into the shell through the first channel, reopen the water inlet to allow cooling water to enter the shell from the water inlet, and still flow out from the first channel for normal heat exchange.

[0013] In the above scale cleaning process, the water continuously injected into the inner cavity of the shell through the second channel and the first channel is also cold water, so it also has a cooling and heat exchange effect on the materials in each heat exchange tube, so there is no need to stop the transportation of materials.

[0014] In summary, the scraper structure of the present invention is simple in design, and the scale is scraped off by directly contacting the scraper on the surface of each heat exchange tube. Compared with non-contact cleaning methods such as ultrasound, the present invention is more guaranteed in cleaning effect to ensure heat exchange efficiency. The entire process is carried out by injecting water into the inner cavity of the shell to control the sliding of the scraper in the shell, which is easy to operate. At the same time, the inner cavity of the shell (outside the heat exchange tube) can be kept basically filled with water throughout the process, so that the scraped scale can be dispersed in the water and automatically flow out of the shell with the water flow, without the need to manually clean the inside of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front sectional view of a high-efficiency heat exchange device for styrene production with automatic descaling according to the utility model (attached Figure 1 The observation angle is along the Figure 2 A-A in the figure is cut downwards);

[0016] Figure 2 This is a schematic diagram of the matching structure between the scraper and the shell in the high-efficiency heat exchange device for styrene production with automatic descaling of the utility model (the upper half of the shell, the upper half of the scraper and the entire left sealing plate are cut away);

[0017] Figure 3 For the attached Figure 1 On the basis of, the scraper is matched in the inner cavity of the shell and coaxially sleeved on each heat exchange tube, and the schematic diagram when sliding from right to left;

[0018] Figure 4 For the attached Figure 1 On the basis of, the scraper is matched in the inner cavity of the shell and coaxially sleeved on each heat exchange tube, and slides to the left to be sufficiently close to the left inner cavity wall of the shell.

[0019] Among them, 10 is a shell, 11 is a left sealing plate, 111 is a first channel, 12 is a right sealing plate, 121 is a second channel, 13 is a water inlet, 16 is a heat exchange tube, 17 is a scraper, 171 is a perforation, and 18 is a threaded mounting hole on the shell for fixing the left sealing plate.

[0020] 20—hemispherical left cover, 21—left cavity,

[0021] 30—feed pipe,

[0022] 40—hemispherical right cover body, 41—right cavity body,

[0023] 50—discharge pipe, 60—fastening bolt, 70—fastening nut. DETAILED DESCRIPTION

[0024] It should be noted that the directional qualifiers "left", "right", "horizontal" and "vertical" used in the description of the present invention refer to the attached Figure 1 , 3 , and 4, the directions "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] As attached Figure 1 As shown, the utility model of the high-efficiency heat exchange device for styrene production with automatic descaling comprises a cylindrical shell 10, the inner cavity of the shell 10 is in the shape of a regular cylinder with the axial direction being horizontal in the left and right directions, and is coaxially arranged with the shell 10, a left sealing plate 11 with a vertical plate surface for sealing the left port of the inner cavity of the shell 10 is coaxially fixed on the left end of the shell 10, and a right sealing plate 12 with a vertical plate surface for sealing the right port of the inner cavity of the shell 10 is coaxially fixed on the right end of the shell 10.

[0026] A hemispherical left cover 20 is provided on the left side of the shell 10 and is coaxially arranged with the shell 10. The hemispherical left cover 20 is sealed and covered on the left plate surface of the left sealing plate 11 outside the shell 10, so as to surround and form a left cavity 21 on the left sealing plate 11. A feeding pipe 30 is coaxially arranged with the hemispherical left cover 20 and is sealed and connected to the hemispherical left cover 20 horizontally along its own axial direction to the right and is further connected to the left cavity 21; a hemispherical right cover 40 is provided on the right side of the shell 10 and is coaxially arranged with the shell 10. The hemispherical right cover 40 is sealed and covered on the right plate surface of the right sealing plate 12 outside the shell 10, so as to surround and form a right cavity 41 on the right sealing plate 12. A discharging pipe 50 is coaxially arranged with the hemispherical right cover 40 and is sealed and connected to the hemispherical right cover 40 horizontally along its own axial direction to the left and is further connected to the right cavity 41.

[0027] A water inlet 13 connecting the inner cavity of the shell 10 and the outside is provided at the top right of the shell 10; a first channel 111 is independently provided in the left sealing plate 11, and the first channel 111 extends vertically upward and then horizontally to the right from the bottom of the edge of the left sealing plate 11 along its own transmission direction and is connected to the right plate surface of the left sealing plate 11 (close to the bottom of the inner cavity of the shell 10), thereby being connected to the inner cavity of the shell 10.

[0028] A plurality of heat exchange tubes 16 are evenly distributed in the inner cavity of the shell 10, and the length direction is horizontal to the left and right. The left end of the heat exchange tube 16 is sealed through the left sealing plate 11 and further communicated with the left cavity 21 outwardly; the right end of the heat exchange tube 16 is sealed through the right sealing plate 12 and further communicated with the right cavity 41 outwardly.

[0029] A scraper 17 with a vertical plate surface is coaxially embedded in the inner cavity of the shell 10. The scraper 17 is provided with a plurality of through holes 171 with the axial direction being horizontal in the left and right directions and connecting the left and right plate surfaces of the scraper 17, one by one corresponding to the heat exchange tubes 16. The heat exchange tubes 16 are coaxially penetrated in the corresponding through holes 171. The scraper 17 is located between the water inlet 13 and the right sealing plate 12 in the horizontal direction of the left and right directions. The scraper 17 can be coaxially matched in the inner cavity of the shell 10 and matched with the sleeve to contact each heat exchange tube 16 for reciprocating sliding. Figure 2 ,

[0030] A second channel 121 is independently opened in the right sealing plate 12. The second channel 121 extends vertically downward from the top of the edge of the right sealing plate 12 along its own transmission direction, then extends horizontally to the left and is connected to the left plate surface of the right sealing plate 12 (at the same time, away from the bottom and top of the inner cavity of the shell 10), thereby communicating with the inner cavity of the shell 10.

[0031] When the heat exchange device is in normal heat exchange operation, the second channel 121 remains closed, and the material containing the product styrene enters the left cavity 21, each heat exchange tube 16, and the right cavity 41 from the feed pipe 30 from left to right, and finally leaves through the discharge pipe 50; at the same time, after the cooling water enters the shell 10 through the water inlet 13, it flows from right to left in the inner cavity of the shell 10 to exchange heat with the materials in each heat exchange tube 16 to cool the materials, and finally leaves the shell 10 from the first channel 111 and enters the collection pool (not shown in the attached figure) for recycling. After working for a long time, the surface of the heat exchange tube 16 will be covered with a layer of scale, which reduces the heat exchange efficiency between the material in the heat exchange tube 16 and the cooling water flowing in the shell 10.

[0032] In this regard, in this solution, a scraper 17 is provided in the inner cavity of the shell 10. The scraper 17 is located between the water inlet 13 and the right sealing plate 12 in the horizontal direction. When the device is in normal heat exchange operation, the water inlet 13 continuously injects water into the inner cavity of the shell 10. Figure 1 As shown, the water pressure of the water injection will continue to make the scraper 17 approach or even press against the right inner cavity wall (right sealing plate 12) of the housing 10 in parallel;

[0033] When it is necessary to clean the scale on the surface of the heat exchange tube 16, the water inlet 13 is closed (at this time, the outside of the heat exchange tube 16 in the inner cavity of the shell 10 is filled with water), the second channel 121 is opened, and water is injected into the inner cavity of the shell 10 through the second channel 121, so that the water storage on the right side of the scraper 17 in the shell 10 gradually increases, thereby squeezing the scraper 17 to the left, so that the scraper 17 cooperates with the inner cavity of the shell 10 to slide from right to left, as shown in the attached figure. Figure 3 Since the scraper 17 is also coaxially sleeved on each heat exchange tube 16, the scraper 17 scrapes the scale on the surface of each heat exchange tube 16 into the accumulated water (located on the left side of the scraper 17 in the inner cavity of the shell 10) through the circumference of each perforation 171 on the left plate surface during the sliding process, and is pushed out of the shell 10 through the first channel 111 by the scraper 17 together with the accumulated water (this part of the outflow water with a high scale content can be collected and discharged separately to avoid it from entering the collection pool), until the scraper 17 is sufficiently close to the left inner cavity wall (left sealing plate 11) of the shell 10, as shown in the attached figure. Figure 4 The first channel 111 is connected to the left inner wall of the shell 10, that is, the water outlet of the shell 10 is arranged on the left inner wall of the shell 10, which can avoid the accumulation of water between the left inner wall of the shell 10 and the scraper 17 and prevent it from flowing out and hindering the scraper 17, so that the scraper 17 can be sufficiently close to the left inner wall of the shell 10 during the above sliding, so that the entire surface of the heat exchange tube 16 is basically scraped by the scraper 17;

[0034] At this time, stop injecting water into the shell 10 through the second channel 121, and instead inject water into the shell 10 through the first channel 111 to push the scraper 17 to slide rightward in cooperation with the inner cavity of the shell 10 (during this process, the accumulated water in the inner cavity of the shell 10 on the right side of the scraper 17 is discharged through the second channel 121 in turn), until the scraper 17 returns to its initial position, that is, sufficiently close to the right inner cavity wall of the shell 10, so that normal heat exchange based on the water inlet 13 and the first channel 111 can continue normally. Then stop injecting water into the shell 10 through the first channel 111, and reopen the water inlet 13 to allow cooling water to enter the shell 10 from the water inlet 13, and still flow out from the first channel 111 for normal heat exchange.

[0035] During the scale cleaning process, the water continuously injected into the inner cavity of the shell 10 through the second channel 121 and the first channel 111 is also cold water, so it also has a cooling and heat exchange effect on the materials in each heat exchange tube 16, so there is no need to stop the transportation of materials.

[0036] In summary, the scraper 17 of the present invention has a simple structural design, and the scraper 17 directly contacts the surface of each heat exchange tube 16 to scrape off the scale. Compared with non-contact cleaning methods such as ultrasound, the present invention is more guaranteed in cleaning effect to ensure the heat exchange efficiency. Water is injected into the inner cavity of the shell 10 to control the sliding of the scraper 17 in the shell 10, which is easy to operate. At the same time, the inner cavity of the shell 10 (the outside of the heat exchange tube 16) can be kept basically filled with water throughout the process, so that the scraped scale can be dispersed in the water and automatically flow out of the shell 10 with the water flow, without the need to manually clean the inside of the shell 10.

Claims

1. A high-efficiency heat exchange device for styrene production with automatic descaling, characterized in that: The heat exchange device comprises a shell (10), wherein a left sealing plate (11) is provided at the left end of the shell (10) for sealing a left port of an inner cavity of the shell (10), and a right sealing plate (12) is provided at the right end of the shell (10) for sealing a right port of an inner cavity of the shell (10). A hemispherical left cover (20) is provided on the left side of the shell (10), and the hemispherical left cover (20) is sealed and covered on the left sealing plate (11) outside the shell (10), so as to surround and form a left cavity (21) on the left sealing plate (11), and a feed pipe (30) is sealed and connected to the hemispherical left cover (20) and is further connected to the left cavity (21); a hemispherical right cover (40) is provided on the right side of the shell (10), and the hemispherical right cover (40) is sealed and covered on the right sealing plate (12) outside the shell (10), so as to surround and form a right cavity (41) on the right sealing plate (12), and a discharge pipe (50) is sealed and connected to the hemispherical right cover (40) and is further connected to the right cavity (41). A water inlet (13) is provided on the right side of the shell (10) for connecting the inner cavity of the shell (10) and the outside. A first channel (111) is independently provided in the left sealing plate (11). The first channel (111) extends from the outer surface of the left sealing plate (11) along its own transmission direction and is connected to the right plate surface of the left sealing plate (11), thereby being connected to the inner cavity of the shell (10). A plurality of heat exchange tubes (16) are distributed in the inner cavity of the shell (10); one end of the heat exchange tube (16) in the length direction is sealed through the left sealing plate (11) and is connected to the left cavity (21); the other end of the heat exchange tube (16) in the length direction is sealed through the right sealing plate (12) and is connected to the right cavity (41). A scraper (17) is provided in the inner cavity of the shell (10), and the scraper (17) is located between the water inlet (13) and the right sealing plate (12) in a left-right and upward direction. The scraper (17) can be sleeved and contacted on each of the heat exchange tubes (16) to slide back and forth. A second channel (121) is independently opened in the right sealing plate (12), and the second channel (121) extends from the outer surface of the right sealing plate (12) along its own transmission direction and is connected to the left plate surface of the right sealing plate (12) and thus communicates with the inner cavity of the shell (10).

2. The high-efficiency heat exchange device for styrene production capable of automatic descaling as claimed in claim 1, characterized in that: The inner cavity of the shell (10) is in the shape of a regular cylinder with the axial direction being horizontal in the left and right directions.

3. The high-efficiency heat exchange device for styrene production capable of automatic descaling as claimed in claim 2, characterized in that: The scraper (17) is coaxially embedded in the inner cavity of the shell (10); the scraper (17) can be coaxially fitted in the inner cavity of the shell (10) and sleeved in contact with each of the heat exchange tubes (16) to slide back and forth.

4. The high-efficiency heat exchange device for styrene production capable of automatic descaling as claimed in claim 1, characterized in that: The scraper (17) is provided with a plurality of through holes (171) corresponding to the heat exchange tubes (16) and connected to the left and right plate surfaces of the scraper (17). The heat exchange tubes (16) are coaxially inserted into the corresponding through holes (171), thereby achieving the matching sleeve arrangement of the scraper (17) on each of the heat exchange tubes (16).

5. The high-efficiency heat exchange device for styrene production capable of automatic descaling as claimed in claim 1, characterized in that: One end of the first channel (111) is connected to the bottom of the edge of the left sealing plate (11) along its own transmission direction, and the other end is connected to a position on the right plate surface of the left sealing plate (11) close to the bottom of the inner cavity of the shell (10).

6. The high-efficiency heat exchange device for styrene production capable of automatic descaling as claimed in claim 5, characterized in that: The first channel (111) extends vertically upwards and then horizontally rightwards from the bottom of the plate edge of the left sealing plate (11) along its own transmission direction and is connected to the right plate surface of the left sealing plate (11).

7. The high-efficiency heat exchange device for styrene production capable of automatic descaling as claimed in claim 1, characterized in that: The water inlet (13) is opened at the top of the shell (10).

8. The high-efficiency heat exchange device for styrene production capable of automatic descaling as claimed in claim 1, characterized in that: The second channel (121) is connected to the topmost point of the edge of the right sealing plate (12) at one end along its own transmission direction, and is connected to a position on the left plate surface of the right sealing plate (12) at the other end, while being away from the bottom and top of the inner cavity of the shell (10).

9. The high-efficiency heat exchange device for styrene production capable of automatic descaling as claimed in claim 8, characterized in that: The second channel (121) extends vertically downward from the top of the plate edge of the right sealing plate (12) along its own transmission direction, then extends horizontally to the left and is connected to the left plate surface of the right sealing plate (12).

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