Oxidation tower for xylene production

Abstract

The utility model relates to an oxidation tower for xylene production, which is characterized in that a sleeve, a venturi tube and a gas outlet pipe which extend along the height direction and are sequentially connected are arranged in a tower body, the gas outlet pipe penetrates through an arc-shaped pore plate and extends to the lower part of the arc-shaped pore plate, and a gas inlet pipe which is positioned above the sleeve and is inserted into the sleeve is also arranged in the tower body; the other end of the gas inlet pipe hermetically extends to the outer side of the tower body. When the oxidation tower is used, raw materials fall down from top to bottom in the oxidation tower, air enters the tower body from the air inlet pipe and reaches the Venturi pipe through the sleeve, the flow speed of the air is increased after the air passes through the Venturi pipe, so that the flow of the air is accelerated, and finally, the air flows out from the bottom end of the air outlet pipe. As the exhaust valve communicated with the inner cavity of the tower body is arranged on the top surface of the tower body, air moves from bottom to top and is in contact with raw materials to scatter the raw materials, so that the heat exchange area of the raw materials is increased, the heat exchange time of the raw materials is shortened, the purity and yield of xylene are improved, and the use of a large amount of heat exchange media is reduced.

Description

Technical Field

[0001] The utility model relates to the field of xylene, in particular to the technical field of xylene production, and specifically refers to an oxidation tower for xylene production. Background Art

[0002] Xylene is a major petrochemical produced by catalytic reforming, the coking of coal into coke fuel. It makes up about 0.5-1% of crude oil and is found in small quantities in gasoline and jet fuel. Xylene is the main product as part of the BTX aromatics (xylenes, benzene and toluene) extracted from catalytic reforming, called "reformate". The mixture is a slightly greasy, colorless liquid used as a solvent. Xylene was named after its discovery in 1851 as a component of wood tar. Millions of tons are produced each year. In 2011 in Singapore, a global consortium began construction of the world's largest xylene plant.

[0003] In the production process of xylene, the light petroleum fraction mixed benzene is subjected to hydrogenation refining, catalytic reforming, and separation to obtain xylene, or the coking crude benzene is obtained by washing and fractionation.

[0004] Currently, xylene is often processed by hydrogenation reforming and gas-liquid separation. The advantage is low cost, but the disadvantage is long heat exchange time for raw materials, resulting in low purity and yield of xylene and large amount of heat exchange medium used. Utility Model Content

[0005] The utility model aims at the deficiencies of the prior art and provides an oxidation tower for xylene production, which breaks up the raw materials, reduces the heat exchange time of the raw materials, improves the purity and yield of xylene, and reduces the large-scale use of heat exchange medium.

[0006] The utility model is realized through the following technical scheme: an oxidation tower for xylene production, comprising a tower body provided with an arc-shaped orifice plate, wherein the tower body is provided with a sleeve, a venturi tube, and an air outlet pipe extending in the height direction and connected in sequence, the air outlet pipe penetrates the arc-shaped orifice plate and extends to the bottom of the arc-shaped orifice plate, the tower body is also provided with an air inlet pipe located above the sleeve and inserted into the sleeve, and the other end of the air inlet pipe is sealed and extends to the outside of the tower body.

[0007] When the utility model is in use, raw materials fall from top to bottom in the oxidation tower, and air enters into the tower body from the air inlet pipe and reaches the venturi tube through the sleeve. The air velocity increases after passing through the venturi tube, thereby accelerating the flow of air. Finally, the air flows out from the bottom end of the air outlet pipe. Since an exhaust valve connected to the inner cavity of the tower body is provided on the top surface of the tower body, the air moves from bottom to top, so the air contacts the raw materials and breaks up the raw materials, thereby increasing the heat exchange area of ​​the raw materials and reducing the heat exchange time of the raw materials, thereby improving the purity and yield of xylene and reducing the large-scale use of heat exchange medium.

[0008] Preferably, the air inlet pipe comprises a pipe body and a first pipe section connected to the bottom end of the pipe body, and the first pipe section extends into the venturi tube.

[0009] This preferred solution extends the first pipe section to the venturi tube, which facilitates the acceleration of air as it flows out of the air inlet pipe, and at the same time increases the distance between the bottom end of the air inlet pipe and the top end of the sleeve, so that the air will not flow out from the opening at the top end of the sleeve.

[0010] Preferably, the first pipe section is truncated cone-shaped, and the large diameter end of the first pipe section is located above the small diameter end.

[0011] This preferred solution facilitates the gathering of air flowing out of the first pipe section by setting the shape of the first pipe section.

[0012] Preferably, the sleeve is further provided with a plurality of first through-holes evenly arranged along the circumferential direction, and the air inlet pipe is provided with second through-holes corresponding to the first through-holes.

[0013] In this preferred solution, the first perforation and the second perforation are arranged to facilitate part of the air to be ejected directly from the side of the air inlet pipe to disperse the raw materials.

[0014] Preferably, the bottom end opening of the air outlet pipe is a bell mouth, and the large diameter end of the bell mouth is located below the small diameter end.

[0015] This preferred solution makes the air more divergent when it flows out by setting the bell mouth.

[0016] Preferably, the outer side of the tower body is also provided with a condensation layer which circumferentially surrounds the tower body, a condensation chamber is provided in the condensation layer, the condensation chamber is connected to a water inlet pipe and a water outlet pipe, and a heating layer is also connected to the inner circumferential surface of the tower body, the heating layer comprises a spirally extending spiral tube, the top end opening of the spiral tube is connected to a steam inlet pipe, and the bottom end opening of the spiral tube is connected to a steam outlet pipe.

[0017] When this preferred solution is used, the raw material can be heated up or cooled down.

[0018] The beneficial effects of the utility model are as follows: the raw materials fall from top to bottom in the oxidation tower, and the air enters the tower body from the air inlet pipe and reaches the venturi tube through the sleeve. The air velocity increases after passing through the venturi tube, thereby accelerating the flow of the air. Finally, the air flows out from the bottom end of the air outlet pipe. Since an exhaust valve connected to the inner cavity of the tower body is provided on the top surface of the tower body, the air moves from bottom to top, so the air contacts the raw materials and breaks up the raw materials, thereby increasing the heat exchange area of ​​the raw materials and reducing the heat exchange time of the raw materials, thereby improving the purity and yield of xylene and reducing the large-scale use of heat exchange medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the main view of the inner cavity of the tower body;

[0021] As shown in the figure:

[0022] 1. tower body, 2. arc-shaped orifice plate, 3. casing, 4. venturi tube, 5. air outlet pipe, 6. first pipe section, 7. first perforation, 8. air inlet pipe, 9. spiral tube, 10. condensation chamber. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0024] See attached Figure 1-2 The utility model discloses an oxidation tower for xylene production, comprising a tower body 1 provided with an arc-shaped orifice plate 2, and a tower cover of the tower body 1 is also provided with an exhaust valve.

[0025] The tower body 1 is provided with a sleeve 3, a venturi tube 4, and an air outlet pipe 5 extending in the height direction and connected in sequence. The air outlet pipe 5 passes through the arc-shaped orifice plate 2 and extends to the bottom of the arc-shaped orifice plate 2. The tower body 1 is also provided with an air inlet pipe 8 located above the sleeve 3 and inserted into the sleeve 3. The other end of the air inlet pipe 8 is sealed and extends to the outside of the tower body 1.

[0026] The air inlet pipe 8 includes a pipe body and a first pipe section 6 connected to the bottom end of the pipe body. The first pipe section 6 extends into the venturi tube 4. The first pipe section 6 is truncated cone-shaped, and the large diameter end of the first pipe section 6 is located above the small diameter end.

[0027] The sleeve 3 is also provided with a plurality of first through holes 7 evenly arranged along the circumferential direction, and the air inlet pipe 8 is provided with second through holes corresponding to the first through holes 7 .

[0028] The bottom end of the air outlet pipe 5 opens into a bell mouth, and the large diameter end of the bell mouth is located below the small diameter end.

[0029] The outer side surface of the tower body 1 is also provided with a condensation layer which circumferentially surrounds the tower body 1, and a condensation chamber 10 is provided in the condensation layer. The condensation chamber 10 is connected to a water inlet pipe and a water outlet pipe. A heating layer is also connected to the inner circumferential surface of the tower body 1, and the heating layer includes a spirally extending spiral tube 9, the top end opening of the spiral tube 9 is connected to a steam inlet pipe, and the bottom end opening of the spiral tube 9 is connected to a steam outlet pipe.

[0030] When the utility model is in use, the raw materials fall from top to bottom in the oxidation tower, and the air enters the tower body 1 from the air inlet pipe 8, and reaches the venturi tube 4 through the sleeve 3. The air velocity increases after passing through the venturi tube 4, thereby accelerating the flow of the air. Finally, the air flows out from the bottom end of the air outlet pipe 5. Since an exhaust valve connected to the inner cavity of the tower body 1 is provided on the top surface of the tower body 1, the air moves from bottom to top, so the air contacts the raw materials and breaks up the raw materials, thereby increasing the heat exchange area of ​​the raw materials, reducing the heat exchange time of the raw materials, thereby improving the purity and yield of xylene, and reducing the large-scale use of heat exchange medium.

[0031] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. An oxidation tower for xylene production, comprising a tower body (1) provided with an arc-shaped perforated plate (2), characterized in that: The tower body (1) is provided with a sleeve (3), a venturi tube (4), and an air outlet pipe (5) extending in a height direction and connected in sequence, the air outlet pipe (5) passing through the arc-shaped orifice plate (2) and extending to the bottom of the arc-shaped orifice plate (2), the tower body (1) is also provided with an air inlet pipe (8) located above the sleeve (3) and inserted into the sleeve (3), the other end of the air inlet pipe (8) extending to the outside of the tower body (1) in a sealed manner.

2. The oxidation tower for xylene production according to claim 1, characterized in that: The air inlet pipe (8) comprises a pipe body and a first pipe section (6) connected to the bottom end of the pipe body, wherein the first pipe section (6) extends into the venturi tube (4).

3. The oxidation tower for xylene production according to claim 2, characterized in that: The first pipe section (6) is in the shape of a truncated cone, and the large diameter end of the first pipe section (6) is located above the small diameter end.

4. The oxidation tower for xylene production according to claim 3, characterized in that: The sleeve (3) is also provided with a plurality of first through holes (7) evenly arranged in the circumferential direction, and the air inlet pipe (8) is provided with second through holes corresponding to the first through holes (7).

5. The oxidation tower for xylene production according to claim 1, characterized in that: The bottom end opening of the air outlet pipe (5) is in the form of a bell mouth, and the large diameter end of the bell mouth is located below the small diameter end.

6. The oxidation tower for xylene production according to claim 1, characterized in that: The outer side surface of the tower body (1) is also provided with a condensation layer which surrounds the tower body (1) in the circumferential direction, a condensation chamber (10) is provided in the condensation layer, the condensation chamber (10) is connected to a water inlet pipe and a water outlet pipe, and the inner circumferential surface of the tower body (1) is also connected to a heating layer, the heating layer comprises a spirally extending spiral tube (9), the top end opening of the spiral tube (9) is connected to a steam inlet pipe, and the bottom end opening of the spiral tube (9) is connected to a steam outlet pipe.

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