Tail gas condensing device for o-nitroaniline production

Abstract

The invention discloses a tail gas condensing device for o-nitroaniline production, and relates to the technical field of o-nitroaniline production, the tail gas condensing device comprises a cylindrical condensing barrel, a conical condensing plate is arranged on the lower side of the top of the condensing barrel, the condensing plate is vertically arranged, and the conical head of the condensing plate faces downwards; a plurality of first concave parts are formed in the lower side surface of the condensation plate, a tail gas exhauster is further rotationally arranged below the condensation plate, and an exhaust area of the tail gas exhauster directly faces the conical surface of the condensation plate; due to the conical condensation plate, on one hand, the contact area between the tail gas and the condensation plate is increased, and on the other hand, the tail gas can be guided; and the first concave part on the condensation plate can increase the retention time of the tail gas on the condensation plate, and meanwhile, the heat dissipation area of the condensation plate is increased, so that the cooling effect on the tail gas is improved.

Description

Technical Field

[0001] The invention relates to the technical field of o-nitroaniline production, in particular to a tail gas condensing device for o-nitroaniline production. Background Art

[0002] In the production of o-nitroaniline, some tail gas containing volatile components will be generated. These tail gases may contain unreacted raw materials (such as aniline, nitric acid, etc.), by-products, water vapor, and some solvent volatiles. The function of the tail gas condensation device is to condense the gaseous substances in the tail gas into liquid by lowering the temperature of the tail gas, so as to recover, treat or control the emission of these substances. This will reduce the pollution of the tail gas to the environment, and it is also possible to recover valuable components, improving the economy and environmental protection of production.

[0003] The prior art also discloses technical solutions for exhaust gas condensation, such as a Chinese patent application with publication number CN219922496U that discloses an exhaust gas condensation device, including a back panel assembly for placing a condensation bag and a heat dissipation assembly for cooling the condensation bag; the back panel assembly includes a back panel and a cover panel hinged on the back panel, and a gap is provided between the back panel and the cover panel; a heat conduction plate is provided on the inner wall surface of the back panel, and the heat dissipation assembly is provided on the outer wall surface of the back panel; the gap between the back panel and the cover panel can be adjusted in time according to the ventilation volume of different fermentation specifications, and a heat dissipation assembly is provided on the outer wall surface of the back panel, and the heat dissipation structure cooperates with the heat conduction plate on the inner wall surface of the back panel to enhance the heat dissipation effect of the installation space.

[0004] The exhaust gas condensation device in the above application document has the following disadvantages when in use: the exhaust gas is condensed by contacting the exhaust gas with a low-temperature back plate. Since the surface of the back plate is flat, when the exhaust gas blows toward the back plate, the exhaust gas is immediately reflected away. The exhaust gas stays on the back plate for a short time, resulting in a low condensation efficiency of the exhaust gas. For this reason, the present invention provides an exhaust gas condensation device for the production of o-nitroaniline. Summary of the invention

[0005] The technical problem solved by the present invention is: in the prior art, the condensation of exhaust gas is achieved by contacting the exhaust gas with a low-temperature backplate. Since the surface of the backplate is flat, when the exhaust gas blows towards the backplate, the exhaust gas is immediately reflected and the exhaust gas stays on the backplate for a short time, resulting in low condensation efficiency of the exhaust gas.

[0006] The present invention can be implemented through the following technical scheme: a tail gas condensation device for the production of o-nitroaniline, comprising a cylindrical condensation barrel, a conical condensation plate is arranged on the lower side of the top of the condensation barrel, the condensation plate is arranged vertically and the cone head of the condensation plate faces downward, a plurality of first recesses are arranged on the lower surface of the condensation plate, and an exhaust gas discharger is rotatably arranged below the condensation plate, and the exhaust area of ​​the exhaust gas discharger faces the cone surface of the condensation plate.

[0007] A further technical improvement of the present invention is that a plurality of retaining rings are arranged at intervals on the lower surface of the condensation plate, and the size of the retaining rings along the generatrix direction of the condensation plate gradually decreases from bottom to top.

[0008] A further technical improvement of the present invention is that the cross section of the retaining ring is an isosceles triangle, and the side of the retaining ring in contact with the condensation plate is the base of the isosceles triangle.

[0009] A further technical improvement of the present invention is that all the retaining ring surfaces are provided with a plurality of second recesses.

[0010] A further technical improvement of the present invention is that a plurality of heat dissipation fins are arranged on the upper surface of the condensation plate.

[0011] A further technical improvement of the present invention is that a guide plate is fixed to the outer periphery of the condensation plate, the guide plate is arranged obliquely and forms an acute downward angle with the condensation plate.

[0012] A further technical improvement of the present invention is that a mounting plate is horizontally arranged at the bottom of the condensation plate, and the mounting plate is detachably connected to the inner wall of the condensation barrel. A support ring is fixed to the inner wall of the condensation barrel, and the support ring includes a horizontal ring and a vertical ring in the vertical direction. A rubber layer is fixed to the side of the vertical ring away from the inner wall of the condensation barrel, and the side of the mounting plate away from the guide plate is tightly attached to the rubber layer.

[0013] A further technical improvement of the present invention is that: cooling water is filled above the condensation plate, guide plate and mounting plate, an annular water outlet pipe is arranged at the center of the condensation plate, a water inlet pipe is fixed to the top of the annular water outlet pipe, and one end of the water inlet pipe extends out of the condensation barrel and is connected to an external water supply system; a plurality of drain pipes are arranged on the top of the condensation barrel, and the drain pipes are connected to an external water pumping system.

[0014] A further technical improvement of the present invention is that a rod No. 1 is connected to the bottom of the exhaust gas emitter, the bottom end of which passes through and is rotatably arranged at the bottom of the condensation barrel, and the rod No. 1 is driven by a motor. An air intake hose is also connected to the bottom of the exhaust gas emitter, the other end of which passes through the condensation barrel and is connected to the external gas supply system.

[0015] A further technical improvement of the present invention is that a thin plate is fixed to one side of the exhaust gas discharger close to the inner wall of the condensation barrel, and the thin plate is arranged vertically.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, the tail gas generated in the production process of o-nitroaniline is sent into the condensation barrel by the tail gas discharger, and flows directly toward the conical surface of the condensation plate, and flows upward along the conical surface of the condensation plate to realize the condensation of the tail gas. The conical condensation plate, on the one hand, increases the contact area between the tail gas and the condensation plate, and on the other hand, can realize the diversion of the tail gas; the first recess on the condensation plate can increase the residence time of the tail gas on the condensation plate, and at the same time increase the heat dissipation area of ​​the condensation plate itself, thereby improving the cooling effect of the tail gas.

[0018] 2. In the present invention, the setting of the baffle ring limits the flow path of the exhaust gas, thereby increasing the contact area and contact time between the exhaust gas and the condensation plate, and improving the condensation effect of the exhaust gas; because the amount of exhaust gas decreases as it flows upward along the condensation plate, the size of the baffle ring is set in a decreasing manner, thereby ensuring the condensation effect while reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0022] Figure 3 It is a cross-sectional schematic diagram of the condensation plate in the present invention;

[0023] Figure 4 For the present invention Figure 3 A partial enlarged view of area A.

[0024] In the figure: 1. condensation barrel; 2. condensation plate; 3. first recess; 4. exhaust gas discharger; 5. baffle ring; 6. second recess; 7. heat dissipation fin; 8. guide plate; 9. mounting plate; 10. support ring; 101. horizontal ring; 102. vertical ring; 11. rubber layer; 12. annular water outlet pipe; 13. water inlet pipe; 14. drain pipe; 15. No. 1 rod; 16. motor; 17. air intake hose; 18. thin plate. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] See also Figure 1-Figure 4As shown, a tail gas condensing device for the production of o-nitroaniline comprises a cylindrical condensing barrel 1, a conical condensing plate 2 is arranged on the lower side of the top of the condensing barrel 1, the condensing plate 2 is arranged vertically and the cone head of the condensing plate 2 faces downward, a plurality of first recesses 3 are arranged on the lower surface of the condensing plate 2, a tail gas discharger 4 is also rotatably arranged below the condensing plate 2, and the exhaust area of ​​the tail gas discharger 4 faces the cone surface of the condensing plate 2; when working, the tail gas generated in the production process of o-nitroaniline is sent into the condensing barrel 1 by the tail gas discharger 4, and flows directly to the cone surface of the condensing plate 2, and flows upward along the cone surface of the condensing plate 2 to realize the condensation of the tail gas, the conical condensing plate 2, on the one hand, increases the contact area between the tail gas and the condensing plate 2, and on the other hand, can realize the diversion of the tail gas; the first recess 3 on the condensing plate 2 can increase the residence time of the tail gas on the condensing plate 2, and at the same time increase the heat dissipation area of ​​the condensing plate 2 itself, thereby improving the cooling effect of the tail gas.

[0027] Furthermore, a plurality of retaining rings 5 ​​are arranged at intervals on the lower surface of the condensation plate 2, and the size of the retaining rings 5 ​​along the busbar direction of the condensation plate 2 gradually decreases from bottom to top; the setting of the retaining rings 5 ​​limits the flow path of the exhaust gas, thereby increasing the contact area and contact time between the exhaust gas and the condensation plate 2, thereby improving the condensation effect of the exhaust gas; because the amount of exhaust gas decreases as it flows upward along the condensation plate 2, the size of the retaining rings 5 ​​is set in a decreasing manner, thereby reducing manufacturing costs while ensuring the condensation effect.

[0028] Preferably, the cross-section of the baffle ring 5 is an isosceles triangle, and the side of the baffle ring 5 in contact with the condensation plate 2 is the base of the isosceles triangle; after the exhaust gas is discharged from the exhaust gas discharger 4, it will flow upward along the conical surface of the condensation plate 2, and flow along the two waist surfaces on the baffle ring 5 with an isosceles triangle cross-section, so as to increase the contact area and contact time between the exhaust gas and the condensation plate 2, thereby improving the condensation effect of the exhaust gas.

[0029] Furthermore, a plurality of second recesses 6 are provided on the surface of all the retaining rings 5; the provision of the second recesses 6 further increases the contact area between the exhaust gas and the condensation plate 2, and increases the residence time of the exhaust gas on the condensation plate 2, thereby improving the condensation effect on the exhaust gas.

[0030] Furthermore, a plurality of heat dissipation fins 7 are arranged on the upper surface of the condensation plate 2; the provision of the heat dissipation fins 7 improves the condensation effect of the condensation plate 2, so that the heat on the condensation plate 2 can be quickly transferred to the cooling water, thereby ensuring the condensation effect of the condensation plate 2 itself.

[0031] Furthermore, a guide plate 8 is fixed to the outer periphery of the condensation plate 2. The guide plate 8 is arranged obliquely and forms an acute angle downward with the condensation plate 2. The setting of the guide plate 8 facilitates the liquid of the exhaust gas flowing to the guide plate 8 to flow downward after condensation.

[0032] Furthermore, a mounting plate 9 is horizontally arranged at the bottom of the condensation plate 2, and the mounting plate 9 is detachably connected to the inner wall of the condensation barrel 1. A support ring 10 is fixed to the inner wall of the condensation barrel 1, and the support ring 10 includes a horizontal transverse ring 101 and a vertical ring 102 in the vertical direction. A rubber layer 11 is fixed to the side of the vertical ring 102 away from the inner wall of the condensation barrel 1, and the side of the mounting plate 9 away from the guide plate 8 is in close contact with the rubber layer 11; the installation of the condensation plate 2 on the condensation barrel 1 is achieved by making the outermost side of the mounting plate 9 in close contact with the rubber layer 11 on the support ring 10.

[0033] Furthermore, the top of the condensation plate 2, the guide plate 8 and the mounting plate 9 are filled with cooling water, and an annular water outlet pipe 12 is arranged at the center of the condensation plate 2, and an inlet pipe 13 is fixed to the top of the annular water outlet pipe 12, and one end of the inlet pipe 13 extends out of the condensation barrel 1 and is connected to the external water supply system; a plurality of drain pipes 14 are arranged on the top of the condensation barrel 1, and the drain pipes 14 are connected to the external water pumping system; when in use, the external delivery system inputs cold water from the inlet pipe 13 into the annular water outlet pipe 12, so that the cold water is at the center of the top of the condensation plate 2. It starts to deposit and gradually fills up the entire condensation plate 2, the guide plate 8 and the top of the mounting plate 9, so that the condensation plate 2 is in a cooling state. When the water temperature above the condensation plate 2, the guide plate 8 and the mounting plate 9 increases, the water can be pumped out from the drain pipe 14 through the pumping system, thereby ensuring that the water above the condensation plate 2, the guide plate 8 and the mounting plate 9 is in a cooling state; in the above, the annular water outlet pipe 12 is set at the center of the condensation plate 2, which greatly ensures the condensation effect of the condensation plate 2, because the exhaust gas content decreases from the cone head part of the condensation plate 2 upwards.

[0034] Furthermore, a rod No. 15 is connected to the bottom of the exhaust gas emitter 4, and the bottom end of the rod No. 15 passes through and is rotatably set at the bottom of the condensation barrel 1, and the rod No. 15 is driven by a motor 16. An air intake hose 17 is also connected to the bottom of the exhaust gas emitter 4, and the other end of the air intake hose 17 passes through the condensation barrel 1 and is connected to an external gas supply system; when working, the external gas supply system inputs the exhaust gas into the air intake hose 17, so that the exhaust gas flows into the exhaust gas emitter 4 through the air intake hose 17, and flows from the exhaust gas emitter 4 to the condensation plate 2; then the motor 16 is used to drive the rod No. 15 and the exhaust gas emitter 4 to rotate, so that the exhaust gas discharged from the exhaust gas emitter 4 can contact different conical positions of the condensation plate 2, thereby making full use of the condensation area of ​​the condensation plate 2.

[0035] Furthermore, a thin plate 18 is fixed to one side of the exhaust gas emitter 4 close to the inner wall of the condensation barrel 1, and the thin plate 18 is arranged vertically; when the motor 16 drives the No. 1 rod 15 to rotate, the exhaust gas emitter 4 will drive the thin plate 18 to rotate, and the thin plate 18 fans the air around the exhaust gas emitter 4, so that part of the air flows upward along the inner wall of the condensation barrel 1, thereby blocking the exhaust gas from flowing along the condensation plate 2 and then flowing to the inner wall of the condensation barrel 1.

[0036] When the present invention is in use, the external gas transmission system inputs the exhaust gas into the intake hose 17, so that the exhaust gas flows into the exhaust gas discharger 4 through the intake hose 17, and flows from the exhaust gas discharger 4 to the condensation plate 2; then the motor 16 drives the No. 1 rod 15 and the exhaust gas discharger 4 to rotate, so that the exhaust gas discharged from the exhaust gas discharger 4 can contact with different conical surface positions of the condensation plate 2, and fully utilizes the condensation area of ​​the condensation plate 2. The exhaust gas flows directly to the conical surface of the condensation plate 2 and flows upward along the conical surface of the condensation plate 2 to achieve condensation of the exhaust gas. The conical condensation plate 2, on the one hand, increases the tail gas volume. The contact area between the exhaust gas and the condensation plate 2 can also be increased, and on the other hand, the exhaust gas can be guided; the first recess 3 on the condensation plate 2 can increase the residence time of the exhaust gas on the condensation plate 2, and at the same time, the heat dissipation area of ​​the condensation plate 2 itself can be increased to improve the cooling effect of the exhaust gas; the setting of the baffle ring 5 limits the path of the exhaust gas flow, thereby increasing the contact area and contact time between the exhaust gas and the condensation plate 2, and improving the condensation effect of the exhaust gas; since the exhaust gas flows upward along the condensation plate 2, the amount of exhaust gas decreases as it flows upward, so the size of the baffle ring 5 is set to be decreasing, while ensuring the condensation effect. At the same time, the manufacturing cost is reduced; the second recess 6 is provided to further increase the contact area between the exhaust gas and the condensation plate 2, and increase the residence time of the exhaust gas on the condensation plate 2, thereby improving the condensation effect of the exhaust gas; the heat dissipation fins 7 are provided to improve the condensation effect of the condensation plate 2, so that the heat on the condensation plate 2 can be quickly transferred to the cooling water, thereby ensuring the condensation effect of the condensation plate 2 itself; the guide plate 8 is provided to facilitate the exhaust gas flowing to the guide plate 8 to flow downward after condensation; the external conveying system inputs cold water from the water inlet pipe 13 into the annular water outlet pipe 12, so that the cold water flows in the cooling water outlet pipe 13, and the cooling water flows in the cooling water outlet pipe 12; the cooling water flows in the cooling water outlet pipe 13, and the cooling water flows in the cooling water outlet pipe 12; the cooling water flows in the cooling water outlet pipe 13, and the cooling water flows in the cooling water outlet pipe 12; the cooling water flows in the cooling water outlet pipe 13, and the cooling water flows in the cooling water outlet pipe 12; the cooling water flows in the cooling water outlet pipe 12 ... Deposition begins at the center of the top of the condensation plate 2 and gradually fills up the entire condensation plate 2, the guide plate 8 and the top of the mounting plate 9, so that the condensation plate 2 is in a cooling state. When the water temperature above the condensation plate 2, the guide plate 8 and the mounting plate 9 increases, the water can be pumped out from the drain pipe 14 through the pumping system, thereby ensuring that the water above the condensation plate 2, the guide plate 8 and the mounting plate 9 is in a cooling state; in the above, the annular water outlet pipe 12 is set at the center of the condensation plate 2, which greatly ensures the condensation effect of the condensation plate 2, because the exhaust gas content decreases from the cone head part of the condensation plate 2 upwards.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A tail gas condensation device for o-nitroaniline production, characterized in that: It comprises a cylindrical condensation barrel (1), a conical condensation plate (2) is arranged on the lower side of the top of the condensation barrel (1), the condensation plate (2) is arranged vertically with the cone head of the condensation plate (2) facing downward, a plurality of first recesses (3) are arranged on the lower surface of the condensation plate (2), and an exhaust gas discharger (4) is rotatably arranged below the condensation plate (2), and the exhaust area of ​​the exhaust gas discharger (4) faces the cone surface of the condensation plate (2).

2. The tail gas condensation device for o-nitroaniline production according to claim 1, characterized in that: A plurality of retaining rings (5) are arranged at intervals on the lower surface of the condensation plate (2), and the size of the retaining rings (5) along the generatrix direction of the condensation plate (2) gradually decreases from bottom to top.

3. The tail gas condensing device for o-nitroaniline production according to claim 2, characterized in that: The cross section of the baffle ring (5) is an isosceles triangle, and the side of the baffle ring (5) in contact with the condensation plate (2) is the base of the isosceles triangle.

4. A tail gas condensation device for o-nitroaniline production according to claim 2 or 3, characterized in that: A plurality of second recesses (6) are formed on the surfaces of all the retaining rings (5).

5. The tail gas condensation device for o-nitroaniline production according to claim 1, characterized in that: A plurality of heat dissipation fins (7) are arranged on the upper surface of the condensation plate (2).

6. The tail gas condensation device for o-nitroaniline production according to claim 1, characterized in that: A guide plate (8) is also fixed to the outer periphery of the condensation plate (2); the guide plate (8) is arranged obliquely and forms an acute downward angle with the condensation plate (2).

7. The tail gas condensation device for o-nitroaniline production according to claim 6, characterized in that: A mounting plate (9) is horizontally arranged at the bottom of the condensation plate (2), and the mounting plate (9) is detachably connected to the inner wall of the condensation barrel (1). A support ring (10) is fixed to the inner wall of the condensation barrel (1), and the support ring (10) includes a horizontal ring (101) and a vertical ring (102) in the vertical direction. A rubber layer (11) is fixed to the side of the vertical ring (102) away from the inner wall of the condensation barrel (1), and the side of the mounting plate (9) away from the guide plate (8) is in close contact with the rubber layer (11).

8. The tail gas condensation device for o-nitroaniline production according to claim 7, characterized in that: The top of the condensation plate (2), the guide plate (8) and the mounting plate (9) are filled with cooling water; an annular water outlet pipe (12) is arranged at the center of the condensation plate (2); a water inlet pipe (13) is fixed to the top of the annular water outlet pipe (12); one end of the water inlet pipe (13) extends out of the condensation barrel (1) and is connected to an external water supply system; a plurality of drainage pipes (14) are arranged on the top of the condensation barrel (1), and the drainage pipes (14) are connected to an external water pumping system.

9. The tail gas condensation device for o-nitroaniline production according to claim 1, characterized in that: The bottom of the exhaust gas discharger (4) is connected to a rod (15), the bottom end of which penetrates through and is rotatably arranged at the bottom of the condensation barrel (1), and the rod (15) is driven by a motor (16). The bottom of the exhaust gas discharger (4) is also connected to an air intake hose (17), the other end of which penetrates through the condensation barrel (1) and is connected to an external gas supply system.

10. The tail gas condensation device for o-nitroaniline production according to claim 9, characterized in that: A thin plate (18) is fixed to one side of the exhaust gas discharger (4) close to the inner wall of the condensation barrel (1), and the thin plate (18) is arranged vertically.

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