Efficient crude benzene condensing and cooling system

Abstract

The utility model discloses an efficient crude benzene condensation cooling system which comprises a benzene steam discharge pipe and a condenser, a precooler is arranged on the outer side of the benzene steam discharge pipe in a penetrating mode, a first cold water inlet is formed in the top of the precooler, and a first cold water outlet is formed in the bottom of the precooler. Distribution plates are symmetrically arranged in the precooler above and below the benzene steam discharge pipe, a plurality of distribution holes are uniformly formed in the distribution plates, a plurality of heat conduction fins are arranged at the top and the bottom of the benzene steam discharge pipe in the precooler, the heat conduction fins penetrate through the distribution plates, the benzene steam discharge pipe is communicated with the condenser through a transition taper pipe, and the benzene steam discharge pipe is communicated with the condenser through the transition taper pipe. A gas-liquid separation assembly is arranged in the condenser below the transition taper pipe, a tube nest cooling assembly is arranged in the condenser above the transition taper pipe, an exhaust port is formed in the top of the condenser, and a liquid outlet is formed in the bottom of the condenser. The pre-cooler and the condenser are matched for use, so that the condensation efficiency of benzene steam can be remarkably improved, and the condensation efficiency can also be remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coolers, and in particular relates to a crude benzene high-efficiency condensation cooling system. Background Art

[0002] Crude benzene is an important raw material and is widely used in the synthesis of various chemicals. In the coke oven gas distillation production process, crude benzene needs to be condensed and cooled to fully condense and cool the crude benzene recovered from the reaction gas, and then processed. The role of the crude benzene condenser cooler is to realize this process, that is, the reaction gas flows through the cooler, the crude benzene is liquefied in the condenser, and then further cooled through the cooling process to reach the ideal temperature and pressure. The crude benzene condenser cooler is a common chemical equipment, mainly used in various crude benzene processing. Under normal circumstances, crude benzene passes through the absorption liquid and then enters the condenser. After the condensation process, it becomes liquid, and then undergoes cooling treatment to reach the ideal temperature and pressure, thereby obtaining high-quality products. In existing technologies, crude benzene vapor generated during the distillation of coke oven gas is primarily cooled using a shell-and-tube heat exchanger. The crude benzene vapor enters the heat exchanger's tubes, and cold water enters the tubes. The cold water cools the crude benzene vapor in the heat exchange tubes, condensing it into liquid. However, this shell-and-tube heat exchanger has the following drawbacks: First, the fixed structure of the shell-and-tube heat exchanger results in a small heat exchange area, making it incapable of fully cooling the crude benzene vapor and resulting in low condensation efficiency. Second, the high benzene content in the exhaust gas after condensation by the shell-and-tube heat exchanger prevents the crude benzene vapor from being completely condensed. This results in a high benzene content in the exhaust gas discharged after condensation, resulting in a waste of resources and a low crude benzene recovery rate. Therefore, it is necessary to develop a high-efficiency crude benzene condensation and cooling system with a rational structural design that can both improve condensation effect and efficiency. Summary of the Invention

[0003] The purpose of the utility model is to provide a crude benzene high-efficiency condensation cooling system with reasonable structural design, which can improve the condensation effect and the condensation efficiency.

[0004] The purpose of the utility model is achieved in this way, including a benzene vapor discharge pipe and a condenser, the outside of the benzene vapor discharge pipe is penetrated by a precooler, the top of the precooler is provided with a first cold water inlet, the bottom of the precooler is provided with a first cold water outlet, distribution plates are symmetrically provided in the precooler above and below the benzene vapor discharge pipe, a plurality of distribution holes are evenly distributed on the distribution plate, and a plurality of heat-conducting fins are provided on the top and bottom of the benzene vapor discharge pipe located in the precooler, the heat-conducting fins are arranged through the distribution plate, the benzene vapor discharge pipe is connected to the condenser through a transition cone tube, a gas-liquid separation component is provided in the condenser below the transition cone tube, a tube-in-tube cooling component is provided in the condenser above the transition cone tube, an exhaust port is provided on the top of the condenser, and a liquid drain port is provided at the bottom.

[0005] Compared with the existing technology, the advantages of this device are: first, a precooler is set on the outside of the steam discharge pipe of this device, and the precooler can pre-condense the benzene steam in the benzene steam discharge pipe. After the cooling water enters the precooler and is evenly distributed through the upper distribution plate, the cooling water can be evenly and fully contacted with the steam discharge pipe, thereby improving the cooling effect of the benzene steam discharge pipe. In this process, the heat-conducting fins set can transfer the heat of the benzene steam discharge pipe to the precooler, increase the heat exchange area, and thus improve the condensation effect of the benzene steam; second, the structure of the condenser is optimized, and the benzene steam is condensed after the precooler. After the benzene vapor enters the condenser, the gas-liquid separation component can perform gas-liquid separation on the pre-cooled benzene vapor, separate the benzene liquid in the pre-cooled benzene vapor, and reduce the benzene content in the benzene vapor. At the same time, the shell and tube cooling component can condense and cool the benzene vapor after gas-liquid separation again. After condensation and cooling by the shell and tube cooling component, the benzene vapor can be thoroughly condensed to achieve efficient recovery of benzene. The coordinated use of the precooler and the condenser can not only significantly improve the condensation efficiency of the benzene vapor, but also significantly improve the condensation efficiency, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0007] In the figure: 1-benzene vapor discharge pipe, 2-condenser, 21-exhaust port, 22-drain port, 23-separation cone, 24-buffer plate, 25-folded edge, 26-water storage box, 27-partition, 28-air guide pipe, 29-condenser, 210-first cold water inlet, 211-second cold water outlet, 212-support plate, 3-precooler, 31-first cold water outlet, 32-second cold water outlet, 33-distribution plate, 34-distribution hole, 35-heat conducting fin, 36-rotating rod, 37-spiral blade, 38-driving mechanism, 4-transition cone. DETAILED DESCRIPTION

[0008] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the scope of protection of the present invention.

[0009] like Figure 1 As shown, the utility model includes a benzene vapor discharge pipe 1 and a condenser 2, a precooler 3 is provided on the outside of the benzene vapor discharge pipe 1, a first cold water inlet 31 is provided on the top of the precooler 3, and a first cold water outlet 32 is provided on the bottom of the precooler 3, and distribution plates 33 are symmetrically provided in the precooler 3 above and below the benzene vapor discharge pipe 1, and a plurality of distribution holes 34 are evenly distributed on the distribution plate 33, and a plurality of heat-conducting fins 35 are provided on the top and bottom of the benzene vapor discharge pipe 1 located in the precooler 3, and the heat-conducting fins 35 are arranged through the distribution plate 33, the benzene vapor discharge pipe 1 is connected to the condenser through a transition cone 4, a gas-liquid separation component is provided in the condenser 2 below the transition cone 4, and a tube-in-tube cooling component is provided in the condenser 2 above the transition cone 4, an exhaust port 21 is provided on the top of the condenser 2, and a drain port 22 is provided at the bottom.

[0010] The working process of this device is: in the process of the benzene vapor generated by distillation entering the condenser 2 through the steam discharge pipe 1, the precooler 3 arranged on the outside of the steam discharge pipe 1 can precool the steam discharge pipe 1. When in use, the cooling water enters the precooler 3 through the first cold water inlet 31, and after being evenly distributed by the upper distribution plate 33 in the precooler 3, the cooling water is evenly distributed between the two distribution plates 33 through the upper distribution plate 33. At this time, the cooling water will precool the benzene vapor in the steam discharge pipe 1. After absorbing heat, the temperature of the cooling water rises, and then it flows into the lower part of the precooler 3 through the lower distribution plate 33, and is discharged from the precooler 3 through the first cold water outlet 32. The temperature of the benzene vapor after the cooling water absorbs heat is reduced. At this time, the benzene vapor with reduced temperature will pass through the transition cone Tube 4 enters the condenser 2. After the cooled benzene vapor enters the condenser 2, the gas-liquid separation component provided can perform gas-liquid separation on the pre-cooled benzene vapor, separate the benzene liquid in the pre-cooled benzene vapor, and reduce the benzene content in the benzene vapor. After gas-liquid separation, the benzene vapor rises in the condenser 2 and enters the tube-in-tube cooling component. The tube-in-tube cooling component can condense and cool the benzene vapor after gas-liquid separation again. After condensation and cooling by the tube-in-tube cooling component, the benzene in the benzene vapor condenses to form liquid and gathers at the lower part of the condenser 2 and is discharged through the drain port 22, while the tail gas that does not contain benzene after cooling is discharged from the exhaust port 21. The coordinated use of the precooler 3 and the condenser 2 can not only significantly improve the condensation efficiency of the benzene vapor, but also significantly improve the condensation efficiency.

[0011] Furthermore, the gas-liquid separation component includes a separation cone hopper 23 and a buffer plate 24. The separation cone hopper 23 is a cone structure with a large upper end and a small lower end. The upper end of the separation cone hopper 23 is fixedly connected to the inner wall of the condenser 2, and the buffer plate 24 is located below the separation cone hopper 23. The buffer plate 24 is fixedly connected to the separation cone hopper 23 through a pull rod. A gap is left between the outer side of the buffer plate 24 and the condenser 2. After the benzene vapor enters the condenser 2, the benzene liquid in the benzene vapor will flow to the separation cone hopper 23 by its own gravity, and fall onto the buffer plate 24 through the middle hole of the separation cone hopper 23 by gravity, so that the benzene liquid It collides with the buffer plate 24 and achieves the purpose of sufficient gas-liquid separation through collision separation. The separated benzene liquid is discharged from the drain port 22, and the benzene vapor enters the upper tube cooling component. Preferably, in order to achieve a better gas-liquid separation effect, the edge of the buffer plate 24 is provided with a downward-bent edge 25, and the separation cone bucket 23 and the buffer plate 24 are at least two groups. Each group of separation cone buckets 23 and buffer plates 24 are distributed in the upper and lower parts of the precooler 3. The arrangement of the separation cone buckets 23 and the buffer plates 24 can realize multiple collisions of benzene vapor in the condenser 2, thereby fully improving the effect of gas-liquid separation.

[0012] Furthermore, the tube cooling assembly includes a water storage box 26, a partition 27 and a plurality of air guide pipes 28. The water storage box 26 is sealed and installed in the condenser 2. The partition 27 is fixedly installed in the condenser 2 below the water storage box 26. The plurality of air guide pipes 28 are evenly distributed and pass through the partition 27 and the water storage box 26. A condensing pipe 29 is coaxially arranged on the outside of each air guide pipe 28. The upper end of the condensing pipe 29 is connected to the bottom of the water storage box 26. A gap is left between the lower end of the condensing pipe 29 and the partition 27. A second cold water inlet 210 connected to the water storage box 26 is provided on the upper part of the condenser 2. A second cold water outlet 211 is provided on the condenser 2 between the lower end of the condensing pipe 29 and the partition 27. After gas-liquid separation, the second cold water outlet 211 is provided on the condenser 2. After separation from the components, the benzene-containing gas flows upward into each air duct 28, and flows upward in the air duct 28. At this time, cooling water is transported to the water storage box 26 through the second cold water inlet 210. The cooling water enters the water storage box 26 and enters each condenser 29 after distribution. The cooling water flows downward in the condenser 29, and can perform heat exchange treatment on the benzene-containing steam in the corresponding air duct 28. After condensation and cooling treatment by the cooling water, the benzene in the benzene-containing steam condenses into benzene liquid and falls into the lower part of the condenser 2, and the steam is discharged from the upper end of the air duct 28, and the cooling water that absorbs heat is discharged from the lower part of the condenser 29, falls on the partition 27, and is finally discharged through the second cold water inlet 211. Preferably, in order to facilitate the timely discharge of cooling water from the second cold water outlet 211, a support plate 212 is provided in the condenser 2 near the lower end of the condenser tube 29, and the condenser tube 29 is provided through the support plate 212. The partition 27 is arranged at an angle in the condenser 2, and the second cold water outlet 211 is provided on the lower side of the partition 27.

[0013] Furthermore, in order to improve the precooling effect of the cooling water in the precooler 3, a rotating rod 36 is rotatably installed in the precooler 3 above and below the distribution plate 33, and a spiral blade 37 is installed on the rotating rod 36. The outer side of the precooler 3 is provided with a driving mechanism 38 that is transmission-connected to the rotating rod 36. The driving mechanism 38 is the structure used in the prior art. The driving mechanism 39 drives the rotating rod 36 to rotate, and then drives the spiral blade 37 to rotate. During the rotation process, the spiral blade 37 can stir the cold water entering the precooler 3, so that the cold water can fully contact the benzene vapor discharge pipe 1, the purpose of which is to improve the condensation of benzene vapor.

[0014] In order to prolong the contact time between the benzene vapor and the cooling water and improve the precooling effect of the precooler 3, the diameter of the transition cone 4 gradually decreases along the flow direction of the benzene vapor.

Claims

1. A crude benzene high-efficiency condensation cooling system, comprising a benzene vapor discharge pipe (1) and a condenser (2), characterized in that: A precooler (3) is provided on the outside of the benzene steam discharge pipe (1), a first cold water inlet (31) is provided on the top of the precooler (3), a first cold water outlet (32) is provided on the bottom of the precooler (3), distribution plates (33) are symmetrically provided in the precooler (3) above and below the benzene steam discharge pipe (1), a plurality of distribution holes (34) are evenly distributed on the distribution plates (33), and the benzene steam discharge pipe (1) located in the precooler (3) is provided with a plurality of distribution holes (34). A plurality of heat-conducting fins (35) are provided at the top and the bottom, and the heat-conducting fins (35) are arranged through the distribution plate (33). The benzene vapor discharge pipe (1) is connected to the condenser through the transition cone (4). A gas-liquid separation component is provided in the condenser (2) below the transition cone (4), and a tube cooling component is provided in the condenser (2) above the transition cone (4). The top of the condenser (2) is provided with an exhaust port (21), and the bottom is provided with a liquid discharge port (22).

2. A crude benzene efficient condensation cooling system according to claim 1, characterized in that: The gas-liquid separation component includes a separation cone bucket (23) and a buffer plate (24). The separation cone bucket (23) is a cone structure with a larger upper end and a smaller lower end. The upper end of the separation cone bucket (23) is fixedly connected to the inner wall of the condenser (2). The buffer plate (24) is located below the separation cone bucket (23). The buffer plate (24) is fixedly connected to the separation cone bucket (23) through a pull rod. A gap is left between the outer side of the buffer plate (24) and the condenser (2).

3. A crude benzene efficient condensation cooling system according to claim 2, characterized in that: The edge of the buffer plate (24) is provided with a folded edge (25) bent downward.

4. A crude benzene efficient condensation cooling system according to claim 2, characterized in that: There are at least two groups of separation cone buckets (23) and buffer plates (24), and each group of separation cone buckets (23) and buffer plates (24) is arranged in an upper and lower distribution in the precooler (3).

5. The crude benzene efficient condensation cooling system according to claim 1, characterized in that: The tube cooling assembly comprises a water storage box (26), a partition (27) and a plurality of air guide pipes (28). The water storage box (26) is sealed and installed in the condenser (2). The partition (27) is fixedly installed in the condenser (2) below the water storage box (26). The plurality of air guide pipes (28) are evenly distributed and penetrate the partition (27) and the water storage box (26). A condensing pipe (29) is coaxially arranged on the outside of each air guide pipe (28). The upper end of the condensing pipe (29) is connected to the bottom of the water storage box (26). A gap is left between the lower end of the condensing pipe (29) and the partition (27). A second cold water inlet (210) connected to the water storage box (26) is provided on the upper part of the condenser (2). A second cold water outlet (211) is provided on the condenser (2) between the lower end of the condensing pipe (29) and the partition (27).

6. A crude benzene efficient condensation cooling system according to claim 5, characterized in that: A support plate (212) is provided in the condenser (2) near the lower end of the condensation tube (29), and the condensation tube (29) is provided through the support plate (212).

7. The crude benzene efficient condensation cooling system according to claim 5, characterized in that: The partition (27) is arranged obliquely in the condenser (2), and the second cold water outlet (211) is arranged on a lower side of the partition (27).

8. The crude benzene efficient condensation cooling system according to claim 1, characterized in that: Rotating rods (36) are rotatably installed in the precooler (3) above and below the distribution plate (33), and spiral blades (37) are installed on the rotating rods (36). A driving mechanism (38) connected to the rotating rods (36) is provided on the outside of the precooler (3).

9. The crude benzene efficient condensation cooling system according to claim 1, characterized in that: The diameter of the transition cone (4) gradually decreases along the flow direction of the benzene vapor.

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