A dual-phase flow field coupling-based anti-blocking washing tower device

Abstract

The application discloses a kind of based on two-phase flow field coupling's anti-blocking washing tower device, including upper tower, lower tower, gas path component, cooler, circulating pump and reflux pump, lower tower includes second air inlet, guide vane, second spray part, injector and second anti-swirl device, second air inlet is opened in the tower body side wall of lower tower, the air inlet end of second air inlet is connected with drying machine, guide vane is fixed in the inner wall of tower body, and guide surface is vertically opposite with second air inlet;Second spray part is connected with first anti-swirl device by circulating pump, the bottom center of lower tower is opened second water outlet, second water outlet is connected with second anti-swirl device, second anti-swirl device is connected with reflux pump, one end of reflux pump is connected with injector by reflux pipe, and the second anti-swirl device is opposite below injector.The application realizes anti-blocking and efficiency by the synergistic effect of baffle and second spray part, injector and second spray part overcome baffle resistance, and when the particle content increases, washing efficiency also increases.

Description

Technical Field

[0001] This invention relates to the field of gas purification equipment technology, specifically to an anti-clogging scrubbing tower device based on two-phase flow field coupling. Background Technology

[0002] PTA is a petroleum derivative and a raw material for the production of polyester fibers. It plays a crucial role in the aromatics-polyester industry chain, and the PTA plant is recognized in the industry as one of the most complex chemical plants. Inert gases, water vapor, small amounts of PTA dust, acetic acid vapor, and methanol gas are emitted upwards through the PTA dryer chimney and enter the PTA dryer scrubbing tower, where multiple liquid sprays are used to wash away entrained solids.

[0003] Washing towers typically employ a segmented structure with upper and lower sections to achieve countercurrent contact between PTA material and the washing medium. This removes trace impurities such as 4-carboxybenzaldehyde and metal ions, ensuring the whiteness and purity of the finished PTA product and thus meeting the stringent requirements of downstream polyester polymerization processes.

[0004] However, the coolers in existing scrubbing towers often become clogged, resulting in high-temperature exhaust gas and unstable airflow, which exacerbates the generation of reaction byproducts and the accumulation of impurities within the tower. Adding interception mechanisms can easily increase the internal pressure of the scrubbing tower, and the aforementioned clogging problem will be further aggravated when the PTA particle content increases. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide an anti-clogging scrubbing tower device based on two-phase flow field coupling, thereby improving the scrubbing efficiency of the scrubbing tower.

[0006] The objective of this invention is achieved through the following technical solution: A clog-resistant scrubbing tower device based on two-phase flow field coupling includes an upper tower, a lower tower, a gas path assembly, a cooler, a circulating pump, and a reflux pump, wherein the gas path assembly is located between the upper tower and the lower tower; The upper tower includes a first anti-cyclone device, a first spray element, and an air outlet. The air outlet is located at the top of the upper tower, and the outlet end of the air outlet is connected to the dryer processor. The first spray element is located below the air outlet. The first anti-cyclone device is connected to the cooler via a circulating pump, and the cooler is connected to the first spray element. The lower tower includes a second air inlet, a guide plate, a second spray element, an ejector, and a second anti-cyclone device. The second air inlet is opened on the side wall of the lower tower body, and the air inlet end of the second air inlet is connected to the dryer. The guide plate is fixed to the inner wall of the tower body, and the guide surface of the guide plate is perpendicular to and directly opposite the second air inlet. The second spray element is connected to the circulating pump, and the outlet is opened at the center of the bottom of the lower tower. The second anti-cyclone device is connected to the return pump through the outlet, and the return pump is connected to the ejector. The second anti-cyclone device is directly below the ejector.

[0007] Preferably, the gas path assembly includes a tray, a chimney, and a first air inlet. One end of the tray is connected to the upper tower, and the other end of the tray is connected to the lower tower. The first air inlet is located at the center of the tray and is connected to the chimney. The chimney is located inside the upper tower. The side of the tray has a water outlet connected to the first anti-cyclone device. Preferably, the second spray element is of the side-by-side type.

[0008] Preferably, the second spray component includes a washing main pipe, connecting pipes, and nozzles. The washing main pipe is connected to the outlet of the circulation pump. The connecting pipes are arranged in several rows, and each row of connecting pipes is connected to the spray washing main pipe. Each row of connecting pipes is provided with multiple nozzles, and the number of nozzles on at least two rows of connecting pipes is different from each other.

[0009] Preferably, the spraying rate of the second spraying component is 39T / H.

[0010] Preferably, the injector includes a nozzle and a short connector. The neck of the nozzle is arc-shaped, the lower end of the nozzle faces the second anti-cyclone device, the upper end of the nozzle is welded to the short connector, and the upper end of the short connector is connected to the return pipe by a thread.

[0011] Preferably, the injection rate of the injector is 22T / H.

[0012] Preferably, the upper tower further includes a tower tray, which is fixedly connected to the inner wall of the upper tower body.

[0013] Preferably, the outlet of the return pump is connected to the downstream user end.

[0014] Preferably, the inlet of the circulating pump is connected to an external water source.

[0015] The present invention has the following advantages and beneficial effects compared with the prior art: (1) The present invention achieves anti-clogging and improved washing efficiency through the synergistic effect of baffle and second spray component. The baffle guides the concentrated flow of gas and solid, preventing particles from surging upward and clogging the cooler, while forming a downward converging airflow, so that solid particles are concentrated and rush to the lower tower spray coverage area under the airflow, greatly increasing the probability of liquid-solid collision; combined with the parallel multi-nozzle spray layout, the converged airflow and spray liquid counteract each other, improving washing efficiency.

[0016] (2) In this application, the spray volume of the parallel spraying components is set to 39T / H and the spray volume of the ejector is 22T / H, which overcomes the problem of increased resistance of the baffle in the washing tower, effectively offsets the airflow resistance brought by the baffle, and jointly ensures the stability of the pressure inside the lower tower.

[0017] (3) By setting up an ejector and a second spraying component, the ejector and the parallel spraying form an opposing layout of spraying downwards and rushing upwards, and the washing range of the two overlaps greatly. The jet generated by the ejector and the spraying liquid work together to form a bidirectional fluid shearing force. At the same time, the particles intercepted by the baffle increase the flow energy of the gas-solid mixture, providing additional kinetic energy support for the opposing flow. As the particle content increases, the overall kinetic energy of the gas-solid flow increases synchronously, further enhancing the opposing shearing effect. Therefore, the washing efficiency can be improved as the particle content increases, avoiding the problem of further clogging caused by the increase of PTA particle content. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process flow of the anti-clogging scrubbing tower of the present invention; Figure 2 This is a schematic diagram of a side-by-side nozzle. Figure 3 This is a schematic diagram of the injector; Figure 4 A schematic diagram of the air intake for the dryer; The markings of the components in the attached diagram: 1-Upper tower, 11-First anti-cyclone device, 12-First spray component, 13-Tower tray, 2-Lower tower, 21-Second air inlet, 22-Guide plate, 23-Second spray component, 231-Washing header, 232-Connecting pipe, 233-Nozzle, 24-Ejector, 241-Injector nozzle, 242-Short connector, 25-Second anti-cyclone device, 3-Gas path assembly, 31-Tray, 32-Chimney, 4-Cooler, 5-Circulation pump, 6-Return pump; Detailed Implementation

[0019] The invention's objective will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the implementation of the invention is not limited to the following embodiments.

[0020] Example 1 A clog-resistant scrubbing tower device based on two-phase flow field coupling includes an upper tower 1, a lower tower 2, a gas path assembly 3, a cooler 4, a circulating pump 5, and a reflux pump 6; the upper tower 1 includes a first anti-cyclone device 11, a first spray element 12, and a tower tray 13; the lower tower 2 includes a second air inlet 21, a guide plate 22, a second spray element 23, an ejector 24, and a second anti-cyclone device 25; the second spray element 23 includes a scrubbing header 231, a connecting pipe 232, and a nozzle 233; the ejector 24 includes a spray nozzle 241 and a short connector 242; the gas path assembly 3 includes a tray 31, a chimney 32, and a first air inlet.

[0021] The upper tower 1 has an outlet at the top, which is connected to the dryer processor. A first spray element 12 is located below the outlet. A tower tray 13 is fixedly connected to the inner wall of the left side of the tower body, and a tray 31 is connected to the bottom. A first air inlet is located at the center of the tray 31, which is connected to a chimney 32. The chimney 32 is located inside the upper tower 1. The gas washed by the lower tower 2 enters the upper tower 1 through the chimney 32.

[0022] A water outlet is provided at the right end of tray 31. The first anti-cyclone device 11 is connected to the first water inlet of the circulating pump 5 through the water outlet. The second water inlet of the circulating pump 5 is connected to external water source. When the liquid level of the upper and lower towers 2 is low, external process water is used for replenishment. The first water outlet of the circulating pump 5 is connected to the first spray element 12 through the cooler 4, and the second water outlet of the circulating pump 5 is connected to the second spray element 23. Part of the liquid in the upper tower 1 is pumped by the circulating pump 5 to the cooler 4 for cooling and then circulated as the spray liquid of the upper tower 1, and the other part is used as the spray washing water of the lower tower 2.

[0023] The second air inlet 21 is located on the side wall of the lower tower 2. The inlet end of the second air inlet 21 is connected to the dryer, and the outlet end of the second air inlet 21 is connected to the lower tower 2. The horizontal axis fixed end of the guide plate 22 is fixedly connected to the inner wall of the tower body. The longitudinal axis guide surface of the guide plate 22 is perpendicular to the second air inlet 21, so that after the drying gas enters the lower tower 2, it is transported downward through the guide surface. The entrained airflow is blocked by the left, right and upper baffles and can only flow downward, preventing the solid particles entrained by the flash vapor from directly running to the upper tower 1, which would cause more impurities in the water of the upper tower 1.

[0024] The second spray element 23 is located at the center of the lower tower 2. The inlet end of the washing main pipe 231 is connected to the outlet of the circulating pump 5. The connecting pipes 232 are arranged in 5 rows, with two pipes in each row, for a total of 10 connecting pipes 232. Each connecting pipe 232 is connected to the washing main pipe 231. Each connecting pipe 232 in the first and fifth rows is equipped with 3 nozzles 233, and each connecting pipe 232 in the second, third, and fourth rows is equipped with 4 nozzles 233, for a total of 36 nozzles 233. This allows the spray volume of the second spray element 23 to reach 39T / H. The high-intensity spray liquid collides with the airflow gathered by the guide plate 22, improving the washing efficiency.

[0025] A second outlet is opened at the center of the bottom of the lower tower 2. The second outlet is connected to the second anti-cyclone device 25. The second anti-cyclone device 25 is connected to the inlet of the return pump 6. The first outlet of the return pump 6 is connected to the downstream user end. The second outlet of the return pump 6 is connected to the ejector 24 through the return pipe. The lower part of the ejector 24 is directly opposite the second anti-cyclone device 25. The liquid in the lower tower 2 flows into the outlet pipe through the second anti-cyclone device 25, and is then pumped out by the return pump 6. Part of it flows back to the lower tower 2, and part of it goes to the downstream user.

[0026] The injector 24 includes a nozzle 241 and a short connector 242. The neck of the nozzle 241 is arc-shaped, with its lower end facing the second anti-cyclone device 25 and its upper end welded to the short connector 242. The upper end of the short connector 242 is connected to the return pipe by a thread, so that the injection rate of the injector 24 is 22T / H. The jet generated by the injector 24 works in conjunction with the spray liquid generated by the second spraying component 23 to form a bidirectional fluid shear force, which strongly peels off the particles that have formed on the tank wall.

[0027] By adding baffles and optimizing the spray structure of the lower tower 2, the solid impurities carried by the dryer gas are washed down evenly and without blind spots in the lower tower 2 of the washing tower. This reduces the wall fouling and the degree and frequency of scaling and clogging in the cooler 4 of the upper tower 1. Furthermore, it ensures that the temperature of the spray water in the tray 13 of the upper tower 1 is low enough after cooling, so that the solids carried by the flash vapor are cooled and precipitated, thus being washed down and meeting the spray washing requirements.

[0028] The above-described specific embodiments are preferred embodiments of the present invention and are not intended to limit the present invention. Any other changes or equivalent substitutions made without departing from the technical solution of the present invention are included within the protection scope of the present invention.

Claims

1. A clog-resistant scrubbing tower device based on two-phase flow field coupling, characterized in that, It includes an upper tower (1), a lower tower (2), a gas path assembly (3), a cooler (4), a circulation pump (5) and a reflux pump (6), wherein the gas path assembly (3) is located between the upper tower (1) and the lower tower (2); The upper tower (1) includes a first anti-cyclone device (11), a first spray element (12), and an air outlet. The air outlet is located at the top of the upper tower (1), and the air outlet end is connected to the dryer processor. The first spray element (12) is located below the air outlet. The first anti-cyclone device (11) is connected to the cooler (4) via a circulating pump (5), and the cooler (4) is connected to the first spray element (12). The lower tower (2) includes a second air inlet (21), a guide plate (22), a second spray element (23), an injector (24), and a second anti-cyclone device (25). The second air inlet (21) is located on the side wall of the lower tower (2). The air inlet end of the second air inlet (21) is connected to the dryer. The guide plate (22) is fixed to the inner wall of the tower body, and the guide surface of the guide plate (22) is perpendicular to the second air inlet (21). The second spray element (23) is connected to the circulating pump (5), and an outlet is opened at the bottom center of the lower tower (2). The second anti-cyclone device (25) is connected to the return pump (6) through the outlet. The return pump (6) is connected to the ejector (24), and the lower part of the ejector (24) is directly opposite the second anti-cyclone device (25). The second spray element (23) is a parallel type. The second spray element (23) includes a washing main pipe (231), connecting pipes (232) and nozzles (233). The washing main pipe (231) is connected to the outlet of the circulation pump (5). The connecting pipes (232) are arranged in several rows, and each row of the connecting pipes (232) is connected to the washing main pipe (231). Each row of the connecting pipes (232) is provided with multiple nozzles (233), and the number of nozzles (233) on at least two rows of the connecting pipes (232) is [not specified]. The spray amounts are different. The spray amount of the second spray element (23) is 39T / H. The sprayer (24) includes a spray nozzle (241) and a short connector (242). The neck of the spray nozzle (241) is arc-shaped. The lower end of the spray nozzle (241) is directly opposite the second anti-cyclone device (25). The upper end of the spray nozzle (241) is welded to the short connector (242). The upper end of the short connector (242) is connected to the return pipe by a thread. The spray amount of the sprayer (24) is 22T / H.

2. The anti-clogging scrubbing tower device based on two-phase flow field coupling according to claim 1, characterized in that, The gas path assembly (3) includes a tray (31), a chimney (32) and a first air inlet. One end of the tray (31) is connected to the upper tower (1), and the other end of the tray (31) is connected to the lower tower (2). The first air inlet is provided at the center of the tray (31) and is connected to the chimney (32). The chimney (32) is located in the tower body of the upper tower (1). The side of the tray (31) is provided with a water outlet connected to the first anti-cyclone device (11).

3. The anti-clogging scrubbing tower device based on two-phase flow field coupling according to claim 1, characterized in that, The upper tower (1) also includes a tower tray (13), which is fixedly connected to the inner wall of the upper tower (1).

4. The anti-clogging scrubbing tower device based on two-phase flow field coupling according to claim 1, characterized in that, The outlet of the reflux pump (6) is connected to the downstream user end.

5. The anti-clogging scrubbing tower device based on two-phase flow field coupling according to claim 1, characterized in that, The inlet of the circulating pump (5) is connected to an external water source.

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