Tar removing device for external circulation rectifying tower

Abstract

The utility model discloses a tar removing device for an external circulation rectifying tower, which belongs to the technical field of rectifying towers and comprises a rectifying tower main body, a condenser and a reboiler, the rectifying tower main body is communicated with the condenser through a pipeline, the condenser is communicated with a return tank through a pipeline, and the return tank is communicated with the rectifying tower main body through a return pipe. The reboiler is communicated with the middle of the rectifying tower body through a reboiler gas phase pipe and communicated with the bottom of the rectifying tower body through a reboiler liquid phase pipe, the bottom of the rectifying tower body is communicated with the distillation retort through a heavy component discharging pipe, and the distillation retort is communicated with the reboiler gas phase pipe through a distillation retort gas phase pipe. A distillation retort vacuum pipe and a distillation retort discharge pipe are arranged at the upper part and the bottom of the distillation retort. According to the utility model, materials enter the distillation retort to generate an instant flash evaporation phenomenon, the generated material gas enters the reboiler gas phase pipe through the distillation retort gas phase pipe and returns to the rectifying tower main body, and the tar is left in the distillation retort, so that the tar produced by a finished product can be separated and purified, and the product quality is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of rectification columns, in particular to a tar removal device for an external circulation rectification column. Background Art

[0002] A negative pressure external circulation rectification column is a type of evaporator and a tower-type vapor-liquid contact device for rectification. By utilizing the property that each component in a mixture has different volatilities, that is, the vapor pressures of each component are different at the same temperature, the light components (low-boiling substances) in the liquid phase are transferred to the gas phase, while the heavy components (high-boiling substances) in the gas phase are transferred to the liquid phase, thereby achieving the purpose of separation. The rectification column is also a mass transfer and heat transfer device widely used in petrochemical production.

[0003] Chinese Patent with application number 201120324859.X and publication number CN202185164U discloses an external circulation vacuum rectification column. This rectification column cannot separate and reprocess the tar produced from the conversion material such as tricyanopyridine, making it difficult to ensure the quality of the finished product. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a tar removal device for an external circulation rectification column, which solves the problem that the existing rectification column cannot separate and reprocess the tar produced from the conversion material such as tricyanopyridine, making it difficult to ensure the quality of the finished product.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A tar removal device for an external circulation rectification column of the utility model includes a rectification column main body. A condenser and a reboiler are arranged outside the rectification column main body. The top of the rectification column main body is communicated with the condenser through a pipeline. The condenser is communicated with a reflux tank through a pipeline. The reflux tank is communicated with the rectification column main body through a reflux pipe, and a reflux pump is installed on the reflux pipe. One side of the reboiler is communicated with the middle part of the rectification column main body through a reboiler vapor pipe, and the other side of the reboiler is communicated with the bottom of the rectification column main body through a reboiler liquid pipe. The bottom of the rectification column main body is communicated with a distillation tank through a heavy component discharge pipe. The distillation tank is communicated with the reboiler vapor pipe through a distillation tank vapor pipe. A distillation tank vacuum pipe is arranged at the upper part of the distillation tank, and a distillation tank discharge pipe is arranged at the bottom of the distillation tank.

[0007] Further, a top product extraction pipe is also connected to the reflux pipe.

[0008] Still further, a delay discharge cut-off valve I and a delay discharge cut-off valve II are installed on the heavy component discharge pipe.

[0009] Furthermore, a bottom of the main body of the rectification column is also connected with a bottom product discharge pipe, and a bottom product discharge pump is installed on the bottom product discharge pipe.

[0010] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0011] In the present utility model, a bottom of the main body of the rectification column is connected with a distillation tank through a heavy component discharge pipe. When the material enters the distillation tank and is under the action of high temperature and high vacuum, an instantaneous flashing phenomenon will occur. The flashed material gas enters the vapor pipe of the reboiler through the vapor pipe of the distillation tank and returns to the main body of the rectification column, while the tar remains in the distillation tank. The present utility model can separate and purify the tar in the finished product to ensure the product quality. Description of the Drawings

[0012] The present utility model will be further described below in conjunction with the description of the drawings.

[0013] Figure 1 It is the front view of the external circulation rectification column tar removal device of the present utility model.

[0014] Description of the reference numerals: 1, main body of the rectification column; 2, condenser; 3, reboiler; 301, vapor pipe of the reboiler; 302, liquid pipe of the reboiler; 4, heavy component discharge pipe; 401, delay discharge cut-off valve I, 402, delay discharge cut-off valve II; 5, distillation tank; 501, vapor pipe of the distillation tank; 502, vacuum pipe of the distillation tank; 503, discharge pipe of the distillation tank; 6, reflux tank; 601, reflux pump; 602, reflux pipe; 603, top product discharge pipe; 701, bottom product discharge pipe; 702, bottom product discharge pump. Specific Embodiments

[0015] As Figure 1 shown, an external circulation rectification column tar removal device includes a main body of the rectification column 1. A condenser 2 and a reboiler 3 are arranged outside the main body of the rectification column 1. The top of the main body of the rectification column 1 is communicated with the condenser 2 through a pipeline. The condenser 2 is communicated with a reflux tank 6 through a pipeline. The reflux tank 6 is communicated with the main body of the rectification column 1 through a reflux pipe 602. A reflux pump 601 is installed on the reflux pipe 602. One side of the reboiler 3 is communicated with the middle of the main body of the rectification column 1 through a vapor pipe 301 of the reboiler. The other side of the reboiler 3 is communicated with the bottom of the main body of the rectification column 1 through a liquid pipe 302 of the reboiler. The bottom of the main body of the rectification column 1 is communicated with a distillation tank 5 through a heavy component discharge pipe 4. The distillation tank 5 is communicated with the vapor pipe 301 of the reboiler through a vapor pipe 501 of the distillation tank. The upper part of the distillation tank 5 is connected with a vacuum pipe 502 of the distillation tank. The bottom of the distillation tank 5 is connected with a discharge pipe 503 of the distillation tank.

[0016] The distillation tank 5 is used for distilling materials to separate tar. When the materials enter the distillation tank 5, due to the action of high temperature and high vacuum, an instantaneous flashing phenomenon will occur. The flashed material gas enters the reboiler gas-phase pipe 301 through the distillation tank gas-phase pipe 501 and returns to the main body 1 of the rectification column. The tar will remain in the distillation tank 5. By setting the distillation tank vacuum pipe 502, it is ensured that the mixed materials can be fully distilled, the pressure of the distillation tank 5 is the same as that of the main body 1 of the rectification column, and the materials can be discharged normally.

[0017] The light-phase materials at the top of the main body 1 of the rectification column enter the condenser 2 through a pipeline to be condensed into a liquid state. The liquid light-phase materials enter the reflux tank 6, and then under the action of the reflux pump 601, the liquid light-phase materials return to the main body 1 of the rectification column through the reflux pipe 602. A top product extraction pipe 603 is also connected to the reflux pipe 602. The liquid light-phase materials flowing out of the reflux tank 6 are sampled and detected through the top product extraction pipe 603. If they meet the standards, the valve at the bottom of the reflux tank 6 is opened to discharge the separated light-phase materials and collect them.

[0018] The heavy-phase materials at the bottom of the main body 1 of the rectification column contain heavy components, and the heavy components contain tar. For easily blocked and crystallized materials, a straight-through pipeline is selected. Therefore, the heavy-component discharge pipe 4 adopts a straight-through pipeline. The heavy-component discharge pipe 4 is welded to the bottom of the main body 1 of the rectification column. The heavy-component discharge pipe 4 is a jacketed pipeline, which includes an inner pipe and an outer pipe. The inner pipe is used to transport materials, and a time-delay discharge cut-off valve I 401 is installed on the inner pipe to maintain a timed and quantitative discharge of materials into the distillation tank 5. A time-delay discharge cut-off valve II 402 is installed on the outer pipe to ensure that during the discharge period, the action is opposite to that of the time-delay discharge cut-off valve I 401 to ensure the liquid level of the rectification column 1. The central control device controls the time-delay discharge cut-off valve I 401 and the time-delay discharge cut-off valve II 402 to perform automatic intermittent discharge setting. The central control device is an existing device, and its specific structure and working method will not be elaborated here. The materials will pass through the inner pipe to the time-delay discharge cut-off valve I 401. The time-delay discharge cut-off valve I 401 is in the closed state, and the time-delay discharge cut-off valve II 402 is in the open state. The materials cannot enter the distillation tank 5. When the set time is reached, the time-delay discharge cut-off valve I 401 is in the open state, and the time-delay discharge cut-off valve II 402 is in the closed state. The materials enter the distillation tank 5, and so on. The heavy components will intermittently and quantitatively enter the distillation tank 5 with high temperature and high vacuum.

[0019] The materials at the bottom of the main body 1 of the rectification column enter the reboiler 3 through the reboiler liquid-phase pipe 302. The materials are heated in the reboiler 3 to expand and even vaporize, and return to the main body 1 of the rectification column through the reboiler gas-phase pipe 301. The reboiler 3 is used to increase the evaporation temperature.

[0020] A bottom of the main rectifying tower 1 is further connected with a bottom product pipe 701, and a bottom product pump 702 is installed on the bottom product pipe 701; the heavy-phase material at the bottom of the main rectifying tower 1 is sampled and detected by using the bottom product pipe 701, and if it meets the standard, the heavy-phase material is pumped out through the bottom product pump 702 and collected.

[0021] The working process of the present utility model is as follows:

[0022] When using the rectifying tower, materials normally enter the rectifying tower and operate normally. After all parameters are stable, the vacuum pipe 502 of the distillation tank 5 is opened, and the vacuum degrees of the main rectifying tower 1 and the distillation tank 5 are the same; then the gas pipe 501 of the distillation tank is opened, and the control personnel put the delay discharging cut-off valve I 401 and the delay discharging cut-off valve II 402 into automatic interlock. The materials intermittently enter the distillation tank 5 through the heavy component discharging pipe 4, the discharging cut-off valve I 401, and the delay discharging cut-off valve II 402. The distillation tank 5 is heated, and the material gas enters the reboiler gas pipe 301 through the gas pipe 501 of the distillation tank and returns to the main rectifying tower 1, and the tar remains in the distillation tank 5. With the automatic intermittent discharging of the delay discharging cut-off valve I 401 and the delay discharging cut-off valve II 402, the distillation process is continuously repeated, the tar accumulates in the distillation tank 5, and the tar in the distillation tank 5 is regularly discharged and filled into barrels through the discharging pipe 503 of the distillation tank.

[0023] The embodiments described above are only descriptions of the preferred modes of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. An external circulation distillation tower tar removal device, comprising a distillation tower body (1), characterized in that: A condenser (2) and a reboiler (3) are arranged outside the distillation tower body (1); the top of the distillation tower body (1) is connected to the condenser (2) through a pipeline; the condenser (2) is connected to a reflux tank (6) through a pipeline; the reflux tank (6) is connected to the distillation tower body (1) through a reflux pipe (602); a reflux pump (601) is installed on the reflux pipe (602); one side of the reboiler (3) is connected to the distillation tower body (1) through a reboiler gas phase pipe (301). The middle part of the distillation tower (5) is connected, the other side of the reboiler (3) is connected to the bottom of the distillation tower body (1) through the reboiler liquid phase pipe (302), the bottom of the distillation tower body (1) is connected to the distillation tank (5) through the heavy component discharge pipe (4), the distillation tank (5) is connected to the reboiler gas phase pipe (301) through the distillation tank gas phase pipe (501), the upper part of the distillation tank (5) is provided with a distillation tank vacuum pipe (502), and the bottom of the distillation tank (5) is provided with a distillation tank discharge pipe (503).

2. The tar removal device of the external circulation distillation tower according to claim 1 is characterized in that: The reflux pipe (602) is also connected to a tower top extraction pipe (603).

3. The tar removal device of the external circulation distillation tower according to claim 1 is characterized in that: The heavy component discharge pipe (4) is provided with a delayed discharge cut-off valve I (401) and a delayed discharge cut-off valve II (402).

4. The tar removal device of the external circulation distillation tower according to claim 1 is characterized in that: The bottom of the distillation tower body (1) is also connected to a bottom extraction pipe (701), and a bottom extraction pump (702) is installed on the bottom extraction pipe (701).

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