Rectifying tower top backflow liquid collecting device

Abstract

The utility model discloses a rectifying tower top backflow liquid collecting device, which relates to the technical field of packed towers and comprises a rectifying tower body, the bottom of the rectifying tower body is communicated with an air inlet channel, the top end of the side face of the rectifying tower body is connected with a water inlet channel, and the top of the rectifying tower body is connected with an exhaust channel in a penetrating manner. A moisture detector is installed on the surface of the exhaust channel and detects moisture contained in gas exhausted from the rectifying tower body. The moisture detector is used for detecting moisture contained in gas exhausted from the rectifying tower body, when the moisture content of the exhausted gas exceeds a preset standard, the moisture detector sends a detection result to the external controller, the external controller sends a turn-off signal to the gas valve, and the gas valve is turned off. The gas discharged from the rectifying tower body is subjected to gas-liquid phase separation, and the reflux liquid at the top of the tower is recovered, so that the phenomenon that the gas phase remained in the liquid is easy to disturb the flowing gas phase in the redistribution process, and the heat exchange efficiency of the gas phase and the liquid phase is influenced can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of packed towers, and particularly relates to a rectifying tower top reflux liquid collecting device. Background Technique

[0002] A rectifying tower can form a phase interface where gas and liquid are in full contact, enabling the rapid and effective transfer of mass and heat. After contact mixing and mass transfer, the gas and liquid phases can be separated in time without entrainment. Rectifying towers can be classified into two categories according to the contact method: continuous contact type (packed tower) and stage-by-stage contact type (plate tower). Among them, in a packed tower, a certain height of packing is filled in a cylindrical shell, so that the liquid is evenly distributed on the top of the packing layer through a top spray device of the tower, and at the same time, it flows through the packing layer from top to bottom along the surface of the packing by gravity and is discharged from the bottom of the tower; the gas passes through the voids of the packing layer under the push of the pressure difference and flows from one end of the tower to the other end, enabling the gas and liquid to contact on the surface of the packing for mass and heat exchange, and the composition of the two phases changes continuously along the height of the tower. When heat transfer occurs between the gas and liquid phases in a packed rectifying tower, due to the difference in air pressure values between the inlet gas and the outlet gas, the gas at the outlet end is likely to carry liquid and overflow from the gas outlet end, and it is necessary to collect and process the reflux liquid.

[0003] The existing reflux liquid collecting devices are often reflux pipes, which redistribute the liquid by connecting to the top of the rectifying tower. However, the gas phase remaining in the redistributed liquid is likely to disturb the flowing gas phase during the redistribution process, affecting the heat exchange efficiency between the gas and liquid phases. Therefore, we propose a rectifying tower top reflux liquid collecting device that can reduce the gas phase disturbance. Content of the Utility Model

[0004] The purpose of the utility model is to provide a rectifying tower top reflux liquid collecting device to solve the problems raised in the above background technique.

[0005] To achieve the above object, the present utility model provides the following technical solution: A rectifying tower top reflux liquid collection device, including a rectifying tower body, the bottom of the rectifying tower body is connected with an air inlet channel, the air inlet channel passes gas into the interior of the rectifying tower body, the top end of the side of the rectifying tower body is connected with a water inlet channel, the water inlet channel passes water into the interior of the rectifying tower body, so that the vapor-liquid phase undergoes mass and heat exchange in the rectifying tower body, and the composition of the two phases changes continuously along the tower height. The top of the rectifying tower body is connected through and provided with an exhaust channel, and a moisture detector is installed on the surface of the exhaust channel. The moisture detector detects the moisture contained in the gas discharged from the rectifying tower body. When the moisture content of the discharged gas exceeds the preset standard, the moisture detector transmits the detection result to an external controller, and the external controller transmits a cut-off signal to the gas valve to close the gas valve, and performs gas-liquid separation on the gas discharged from the rectifying tower body. The top of the exhaust channel is connected with a three-way external discharge pipe, one end of the three-way external discharge pipe is connected with a reflux drainage pipe, the lower end of the reflux drainage pipe is detachably connected with a gas-liquid separation pipe, and a plurality of dispersion plates are welded on the inner wall of the gas-liquid separation pipe. The dispersion plates are used to disperse the gas-liquid mixture entering the gas-liquid separation pipe. The bottom of the gas-liquid separation pipe is communicated with a collection box, the top of the collection box is connected with a delivery pipe, the top of the collection box is provided with air holes, the end of the gas-liquid separation pipe is communicated with a gas return channel, one end of the gas return channel is communicated with the air inlet channel through a confluence pipe, the lower end of the gas-liquid separation pipe is connected with a drainage pipe, one end of the drainage pipe is communicated with the lower end of the rectifying tower body, and the lower end of the rectifying tower body is connected with a drainage pipe.

[0006] As a further scheme of the present utility model: A gas valve is installed at the upper end of the three-way external discharge pipe. The gas valve controls the air flow through the top opening of the three-way external discharge pipe, and can avoid the high-moisture gas from flowing back at the top opening of the three-way external discharge pipe and disturbing the mass and heat transfer of the gas-liquid phase.

[0007] As a further scheme of the present utility model: The reflux drainage pipe forms an acute angle with the horizontal plane. One end of the reflux drainage pipe is welded to the reflux port of the three-way external discharge pipe, and the three-way external discharge pipe passes the gas-liquid mixture with abnormal moisture content into the reflux drainage pipe.

[0008] As a further scheme of the present utility model: Heat dissipation fins are fixed on the surface of the reflux drainage pipe, and the heat dissipation fins are arranged in an equidistant circular array on the surface of the reflux drainage pipe. The heat dissipation fins can accelerate the condensation speed of the high-temperature moisture-containing gas.

[0009] As a further scheme of the present utility model: The gas-liquid separation pipe is a continuous S-shaped hollow pipe. One end of the gas-liquid separation pipe forms an arc-shaped pipe. The gas-liquid separation pipe is communicated with the gas return channel through the arc-shaped pipe. The gas return channels are linearly arranged at equal intervals in the vertical direction, and can uniformly recover the refluxed gas.

[0010] As a further solution of the present utility model: A first valve is installed at the connection between the manifold pipe and the intake passage. The first valve is a one-way valve, which can prevent gas from flowing back.

[0011] As a further solution of the present utility model: Multiple said dispersible tablets are symmetrically distributed and welded on the inner wall of the gas-liquid separation pipe. The dispersible tablets are triangular hard thin sheets, which can disperse the water vapor in the gas-liquid separation pipe and accelerate the escape of gas molecules in the liquid.

[0012] As a further solution of the present utility model: One end of the drain pipe is welded with a threaded joint, and a second valve is installed on the surface of the gas-liquid separation pipe. The second valve controls the on-off of the fluid in the gas-liquid separation pipe and controls the water body entering the collection box.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] 1. By installing a moisture detector on the surface of the exhaust passage, the moisture detector can detect the moisture contained in the gas discharged from the inside of the rectification tower body. When the moisture content of the discharged gas exceeds the preset standard, the moisture detector sends the detection result to the external controller, and the external controller sends a shut-off signal to the gas valve to close the gas valve, and performs gas-liquid separation on the gas discharged from the rectification tower body. By recycling the reflux liquid at the top of the tower, it is possible to avoid the gas phase remaining in the liquid from easily disturbing the flowing gas phase during the redistribution process and affecting the heat exchange efficiency of the gas-liquid phase.

[0015] 2. By controlling the airflow to pass through the top opening of the three-way exhaust pipe with the gas valve, it is possible to avoid the high-moisture gas from flowing back at the top opening of the three-way exhaust pipe and disturbing the mass and heat transfer of the gas-liquid phase. By symmetrically welding multiple said dispersible tablets on the inner wall of the gas-liquid separation pipe, the water vapor in the gas-liquid separation pipe can be dispersed, and the escape of gas molecules in the liquid can be accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structure diagram of the present utility model;

[0017] Figure 2 is the present utility model Figure 1 an enlarged view of A in;

[0018] Figure 3 is a bottom perspective structure diagram of the present utility model.

[0019] In the figure: 1. Rectifying column body; 2. Intake channel; 3. Water inlet channel; 4. Exhaust channel; 5. Moisture detector; 6. Three-way external discharge pipe; 7. Return flow diversion pipe; 8. Heat sink; 9. Gas valve; 10. Gas-liquid separation pipeline; 11. Dispersed tablets; 12. Gas return channel; 13. Confluence pipe; 14. First valve; 15. Drainage pipeline; 16. Second valve; 17. Threaded joint; 18. Collection box; 19. Delivery pipe; 20. Air hole. Detailed implementation mode

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1 - 3 , the present invention provides a technical solution: a rectifying column top reflux liquid collection device, including a rectifying column body 1, the bottom of the rectifying column body 1 is connected to an intake channel 2, the intake channel 2 introduces gas into the interior of the rectifying column body 1, the top side of the rectifying column body 1 is connected to a water inlet channel 3, the water inlet channel 3 introduces water into the interior of the rectifying column body 1, so that the vapor-liquid phase undergoes mass and heat exchange in the rectifying column body 1, and the composition of the two phases changes continuously along the height of the column. The top of the rectifying column body 1 is connected through an exhaust channel 4, and a moisture detector 5 is installed on the surface of the exhaust channel 4. The moisture detector 5 detects the moisture contained in the gas discharged from the rectifying column body 1. When the moisture content of the discharged gas exceeds the preset standard, the moisture detector 5 sends the detection result to an external controller, and the external controller sends a cut-off signal to the gas valve 9 to close the gas valve 9, and the gas discharged from the rectifying column body 1 is subjected to gas-liquid separation. The top of the exhaust channel 4 is connected to a three-way external discharge pipe 6, and a gas valve 9 is installed at the upper end of the three-way external discharge pipe 6. The gas valve 9 controls the air flow through the top opening of the three-way external discharge pipe 6, which can prevent the gas with high water content from flowing back at the top opening of the three-way external discharge pipe 6 and disturbing the mass and heat transfer of the gas-liquid phase. Controllers that switch valves according to received signals have been widely used in the prior art, and those skilled in the art can select a suitable model of controller according to the prior art.

[0022] One end of the three-way outer discharge pipe 6 is connected with a reflux drainage pipe 7. The lower end of the reflux drainage pipe 7 is detachably connected with a gas-liquid separation pipeline 10. A plurality of dispersion plates 11 are welded on the inner wall of the gas-liquid separation pipeline 10. The dispersion plates 11 are used to disperse the vapor-liquid mixture entering the gas-liquid separation pipeline 10. The bottom of the gas-liquid separation pipeline 10 is communicated with a collection box 18. The top of the collection box 18 is connected with a delivery pipe 19. An air hole 20 is opened at the top of the collection box 18. The end of the gas-liquid separation pipeline 10 is communicated with a gas reflux channel 12. One end of the gas reflux channel 12 is connected with the intake channel 2 through a confluence pipe 13. The lower end of the gas-liquid separation pipeline 10 is connected with a drainage pipeline 15. One end of the drainage pipeline 15 is communicated with the lower end of the distillation column body 1. The lower end of the distillation column body 1 is connected with the drainage pipeline 15.

[0023] Preferably, as Figure 1 shown, the reflux drainage pipe 7 forms an acute angle with the horizontal plane. One end of the reflux drainage pipe 7 is welded to the reflux port of the three-way outer discharge pipe 6. The three-way outer discharge pipe 6 feeds the vapor-liquid mixture with abnormal water content into the reflux drainage pipe 7.

[0024] Preferably, as Figure 2 shown, heat dissipation fins 8 are fixed on the surface of the reflux drainage pipe 7. The heat dissipation fins 8 are arranged in an equidistant circular array on the surface of the reflux drainage pipe 7. The heat dissipation fins 8 can accelerate the condensation speed of the high-temperature water-containing gas.

[0025] Preferably, as Figure 3 shown, the gas-liquid separation pipeline 10 is a continuous S-shaped hollow pipeline. One end of the gas-liquid separation pipeline 10 forms an arc-shaped pipeline. The gas-liquid separation pipeline 10 is communicated with the gas reflux channel 12 through the arc-shaped pipeline. The gas reflux channels 12 are arranged in an equidistant linear arrangement in the vertical direction, and can evenly recover the refluxed gas.

[0026] Preferably, as Figure 1 shown, a first valve 14 is installed at the connection between the confluence pipe 13 and the intake channel 2. The first valve 14 is a one-way valve, which can prevent gas backflow.

[0027] Preferably, as Figure 1 shown, a plurality of dispersion plates 11 are symmetrically distributed and welded on the inner wall of the gas-liquid separation pipeline 10. The dispersion plates 11 are triangular hard thin plates. The dispersion plates 11 can disperse the water vapor in the gas-liquid separation pipeline 10 and accelerate the escape of gas molecules in the liquid.

[0028] Preferably, as Figure 1 shown, a threaded joint 17 is welded at one end of the drainage pipeline 15. A second valve 16 is installed on the surface of the gas-liquid separation pipeline 10. The second valve 16 controls the on-off of the fluid in the gas-liquid separation pipeline 10 and controls the water body entering the collection box 18.

[0029] Working principle: During use, when the moisture detector 5 detects the moisture contained in the gas discharged from the rectification tower body 1 and the moisture content of the discharged gas exceeds the preset standard, the moisture detector 5 sends the detection result to the external controller. The external controller sends a shut-off signal to the gas valve 9 to close the gas valve 9, and conveys the gas discharged from the rectification tower body 1 into the reflux diversion pipe 7, and cools and condenses it through the heat sink 8, so that the hot air with moisture condenses and flows back. When the water vapor enters the gas-liquid separation pipe 10, the dispersing tablets 11 in the gas-liquid separation pipe 10 disperse the water vapor, which is beneficial for the gas to escape through the gas return channel 12. The escaped gas enters the intake channel 2 through the manifold 13 for recovery. Open the second valve 16, and the liquid-phase fluid at the separation flows into the collection tank 18 for storage. When the fluid stored inside the collection tank 18 exceeds the maximum storage capacity, it is discharged from the collection tank 18 through the delivery pipe 19 connected to the lift pump body.

[0030] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rectifying column top reflux liquid collecting device, comprising a rectifying column body (1), an air inlet channel (2) is connected to the bottom of the rectifying column body (1), and a water inlet channel (3) is connected to the top end of the side surface of the rectifying column body (1), characterized in that, An exhaust passage (4) is connected through the top of the rectifying column body (1). A moisture detector (5) is installed on the surface of the exhaust passage (4). The top of the exhaust passage (4) is connected to a three-way outer discharge pipe (6). One end of the three-way outer discharge pipe (6) is connected to a reflux drainage pipe (7). The lower end of the reflux drainage pipe (7) is detachably connected to a gas-liquid separation pipeline (10). A plurality of dispersion plates (11) are welded to the inner wall of the gas-liquid separation pipeline (10). The end of the gas-liquid separation pipeline (10) communicates with a gas reflux passage (12). One end of the gas reflux passage (12) is communicated with the intake passage (2) through a confluence pipe (13). The bottom of the gas-liquid separation pipeline (10) communicates with a collection box (18). The top of the collection box (18) is connected to a delivery pipe (19). An air hole (20) is opened at the top of the collection box (18). The lower end of the rectifying column body (1) is connected to a drainage pipeline (15).

2. The rectifying column top reflux liquid collection device according to claim 1, characterized in that: A gas valve (9) is installed at the upper end of the three-way outer discharge pipe (6). The gas valve (9) controls the airflow through the top opening of the three-way outer discharge pipe (6).

3. The rectifying column top reflux liquid collecting device according to claim 1, characterized in that: The reflux drainage pipe (7) forms an acute angle with the horizontal plane. One end of the reflux drainage pipe (7) is welded to the reflux port of the three-way outer discharge pipe (6).

4. A rectifying column top reflux liquid collecting device according to claim 1, characterized in that: Heat dissipation fins (8) are fixed on the surface of the reflux drainage pipe (7). The heat dissipation fins (8) are arranged in an equidistant circular array on the surface of the reflux drainage pipe (7).

5. A rectifying column top reflux liquid collecting device according to claim 1, characterized in that: The gas-liquid separation pipeline (10) is a continuous S-shaped hollow pipeline. An arc-shaped pipeline is formed at one end of the gas-liquid separation pipeline (10). The gas-liquid separation pipeline (10) communicates with the gas reflux passage (12) through the arc-shaped pipeline. The gas reflux passages (12) are arranged in an equidistant linear pattern in the vertical direction.

6. The rectifying column top reflux liquid collecting device according to claim 1, characterized in that: A first valve (14) is installed at the connection between the confluence pipe (13) and the intake passage (2). The first valve (14) is a one-way valve.

7. A rectifying column top reflux liquid collecting device according to claim 1, characterized in that: The plurality of dispersion plates (11) are symmetrically distributed and welded to the inner wall of the gas-liquid separation pipeline (10). The dispersion plates (11) are triangular hard thin plates.

8. A rectifying column top reflux liquid collecting device according to claim 1, characterized in that: A threaded joint (17) is welded to one end of the drainage pipeline (15). A second valve (16) is installed on the surface of the gas-liquid separation pipeline (10). The second valve (16) controls the on-off of the fluid in the gas-liquid separation pipeline (10).

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