A tail gas condensation device for o-nitroaniline production

Abstract

This invention discloses a tail gas condensation device for the production of o-nitroaniline, relating to the field of o-nitroaniline production technology. It includes a cylindrical condenser tank with a conical condenser plate disposed on the lower side of the top. The condenser plate is vertically arranged with its cone tip facing downwards. Multiple first recesses are arranged on the lower surface of the condenser plate. A tail gas emitter is rotatably disposed below the condenser plate, with the exhaust area of ​​the emitter facing the conical surface of the condenser plate. The conical condenser plate increases the contact area between the tail gas and the condenser plate, and also guides the flow of the tail gas. The first recesses on the condenser plate increase the residence time of the tail gas on the condenser plate, while simultaneously increasing the heat dissipation area of ​​the condenser plate itself, thus improving the cooling effect on the tail gas.

Description

Technical Field

[0001] This invention relates to the field of o-nitroaniline production technology, specifically to a tail gas condensation device for o-nitroaniline production. Background Technology

[0002] The production of o-nitroaniline generates tail gases containing volatile components. These tail gases may contain unreacted raw materials (such as aniline, nitric acid, etc.), byproducts, water vapor, and some solvent volatiles. The purpose of the tail gas condensation unit is to reduce the temperature of the tail gas, causing the gaseous substances to condense into a liquid state, so that these substances can be recovered, treated, or controlled for emission. This reduces the pollution of the tail gas to the environment and may also allow for the recovery of valuable components, improving the economic efficiency and environmental friendliness of the production process.

[0003] Existing technologies also disclose technical solutions for exhaust gas condensation. For example, a Chinese patent application, publication number CN219922496U, discloses an exhaust gas condensation device, including a back plate assembly for placing a condensation bag and a heat dissipation assembly for cooling the condensation bag. The back plate assembly includes a back plate and a cover plate hinged to the back plate, with a gap between the back plate and the cover plate. A heat-conducting plate is provided on the inner wall of the back plate, and the heat dissipation assembly is provided on the outer wall of the back plate. The gap between the back plate and the cover plate can be adjusted in time according to the aeration rate of different fermentation specifications. The heat dissipation assembly is provided on the outer wall of the back plate, and the heat dissipation structure cooperates with the heat-conducting plate on the inner wall of the back plate to enhance the heat dissipation effect of the installation space.

[0004] The exhaust gas condensation device in the above application 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 is blown towards the back plate, the exhaust gas is immediately reflected away. The exhaust gas stays on the back plate for a short time, resulting in low condensation efficiency. Therefore, 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 this invention is: In the prior art, 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 is blown towards the back plate, the exhaust gas is immediately reflected away, and the exhaust gas stays on the back plate for a short time, resulting in low condensation efficiency.

[0006] The present invention can be achieved by the following technical solution: a tail gas condensation device for the production of o-nitroaniline, comprising a cylindrical condensation tank, a conical condensation plate arranged on the lower side of the top of the condensation tank, the condensation plate being vertically arranged with the cone tip facing downwards, a plurality of first recesses arranged on the lower surface of the condensation plate, and a tail gas emitter rotatably arranged below the condensation plate, with the exhaust area of ​​the tail gas emitter facing the conical surface of the condensation plate.

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

[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 that contacts the condenser plate is the base of the isosceles triangle.

[0009] A further technical improvement of the present invention is that: all of 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 condenser plate.

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

[0012] A further technical improvement of the present invention is that: a mounting plate is horizontally arranged at the bottom of the condenser plate, the mounting plate is detachably connected to the inner wall of the condenser tank, a support ring is fixed to the inner wall of the condenser tank, the support ring includes a horizontal ring in the horizontal direction 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 condenser tank, and the side of the mounting plate away from the guide plate is in close contact with the rubber layer.

[0013] A further technical improvement of the present invention is that: cooling water is filled above the condenser plate, the guide plate and the mounting plate; an annular water outlet pipe is provided at the center of the condenser plate; a water inlet pipe is fixed at the top of the annular water outlet pipe, and one end of the water inlet pipe extends out of the condenser tank and is connected to an external water supply system; multiple drain pipes are provided at the top of the condenser tank, 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 is connected to the bottom of the exhaust gas emitter, the bottom end of the rod is inserted through and rotatably mounted at the bottom of the condenser, and the rod is driven by a motor; an air intake hose is also connected to the bottom of the exhaust gas emitter, the other end of the air intake hose is inserted through the condenser and connected to an external air supply system.

[0015] A further technical improvement of the present invention is that a thin plate is fixed on the side of the exhaust gas emitter near the inner wall of the condenser, and the thin plate is arranged vertically.

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

[0017] 1. In this invention, the tail gas generated during the production of o-nitroaniline is sent into the condenser by the tail gas emitter, and flows directly towards the conical surface of the condenser plate, and flows upward along the conical surface of the condenser plate to achieve condensation of the tail gas. The conical condenser plate increases the contact area between the tail gas and the condenser plate on the one hand, and can guide the flow of the tail gas on the other hand. The first concave part on the condenser plate can increase the residence time of the tail gas on the condenser plate, and at the same time increase the heat dissipation area of ​​the condenser plate itself, thereby improving the cooling effect of the tail gas.

[0018] 2. In this invention, the baffle ring restricts the path of exhaust gas flow, thereby increasing the contact area and contact time between the exhaust gas and the condenser plate, and improving the condensation effect of the exhaust gas. Since the amount of exhaust gas decreases as it flows upward along the condenser plate, the size of the baffle ring is set in a decreasing manner to reduce manufacturing costs while ensuring the condensation effect. Attached Figure Description

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

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

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 3 This is a cross-sectional view of the condenser plate in this invention;

[0023] Figure 4 For the present invention Figure 3 Enlarged view of a portion of region A in the middle.

[0024] In the diagram: 1. Condenser tank; 2. Condenser plate; 3. First recess; 4. Exhaust gas emitter; 5. Baffle ring; 6. Second recess; 7. Heat dissipation fins; 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. Rod No. 1; 16. Motor; 17. Air inlet hose; 18. Thin plate. Detailed Implementation

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, 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] Please see Figures 1-4As shown, a tail gas condensation device for o-nitroaniline production includes a cylindrical condenser tank 1. A conical condenser plate 2 is provided on the lower side of the top of the condenser tank 1. The condenser plate 2 is vertically arranged with its cone facing downwards. A plurality of first recesses 3 are arranged on the lower surface of the condenser plate 2. A tail gas emitter 4 is rotatably arranged below the condenser plate 2, and the exhaust area of ​​the tail gas emitter 4 is directly opposite the conical surface of the condenser plate 2. During operation, the tail gas generated during the o-nitroaniline production process is sent into the condenser tank 1 by the tail gas emitter 4, and flows directly towards the conical surface of the condenser plate 2, and flows upwards along the conical surface of the condenser plate 2 to achieve condensation of the tail gas. The conical condenser plate 2 increases the contact area between the tail gas and the condenser plate 2 on the one hand, and can guide the flow of the tail gas on the other hand. The first recesses 3 on the condenser plate 2 can increase the residence time of the tail gas on the condenser plate 2, and at the same time increase the heat dissipation area of ​​the condenser plate 2 itself, thereby improving the cooling effect of the tail gas.

[0027] Furthermore, a plurality of baffle rings 5 ​​are arranged at intervals on the lower surface of the condenser plate 2, and the size of the baffle rings 5 ​​gradually decreases from bottom to top along the generatrix of the condenser plate 2. The baffle rings 5 ​​restrict the path of the exhaust gas flow, thereby increasing the contact area and contact time between the exhaust gas and the condenser plate 2, and improving the condensation effect of the exhaust gas. Since the amount of exhaust gas decreases as it flows upward along the condenser plate 2, the size of the baffle rings 5 ​​is set in a decreasing manner to reduce 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 that contacts the condenser plate 2 is the base of the isosceles triangle; after the exhaust gas is discharged from the exhaust gas emitter 4, it will flow upward along the conical surface of the condenser plate 2 and flow along the two waist surfaces of the baffle ring 5 with the cross-section of an isosceles triangle, so as to increase the contact area and contact time between the exhaust gas and the condenser plate 2 and improve the condensation effect of the exhaust gas.

[0029] Furthermore, all of the baffle rings 5 ​​have multiple second recesses 6 on their surfaces; the setting of the second recesses 6 further increases the contact area between the exhaust gas and the condenser plate 2, and increases the residence time of the exhaust gas on the condenser plate 2, thereby improving the condensation effect of the exhaust gas.

[0030] Furthermore, the upper surface of the condenser plate 2 is provided with a plurality of heat dissipation fins 7; the arrangement of the heat dissipation fins 7 improves the condensation effect of the condenser plate 2, so that the heat on the condenser plate 2 can be quickly transferred to the cooling water, ensuring the condensation effect of the condenser plate 2 itself.

[0031] Furthermore, a guide plate 8 is fixed to the outer periphery of the condenser plate 2. The guide plate 8 is arranged at an angle and forms an acute angle downward with the condenser plate 2. The guide plate 8 is designed to facilitate the downward flow of liquid after the exhaust gas at the guide plate 8 is condensed.

[0032] Furthermore, a mounting plate 9 is horizontally arranged at the bottom of the condenser plate 2. The mounting plate 9 is detachably connected to the inner wall of the condenser tank 1. A support ring 10 is fixed to the inner wall of the condenser tank 1. The support ring 10 includes a horizontal ring 101 in the horizontal direction 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 condenser tank 1. The side of the mounting plate 9 away from the guide plate 8 is in close contact with the rubber layer 11. By tightly contacting the outermost part of the mounting plate 9 with the rubber layer 11 on the support ring 10, the condenser plate 2 is installed on the condenser tank 1.

[0033] Furthermore, cooling water is filled above the condenser plate 2, the guide plate 8, and the mounting plate 9. An annular water outlet pipe 12 is located at the center of the condenser plate 2. An inlet pipe 13 is fixed to the top of the annular water outlet pipe 12, with one end of the inlet pipe 13 extending outside the condenser tank 1 and connected to an external water supply system. Multiple drain pipes 14 are located on the top of the condenser tank 1, and these drain pipes 14 are connected to an external water pumping system. In use, the external supply system inputs cold water from the inlet pipe 13 into the annular water outlet pipe 12, causing the cold water to accumulate at the center of the top of the condenser plate 2. The water begins to deposit and gradually fills the entire area above the condenser plate 2, guide plate 8, and mounting plate 9, keeping the condenser plate 2 in a cooling state. When the water temperature above the condenser plate 2, guide plate 8, and mounting plate 9 increases, the water can be pumped out from the drain pipe 14 through the pumping system, thus ensuring that the water above the condenser plate 2, guide plate 8, and mounting plate 9 remains in a cooling state. In the above, the annular water outlet pipe 12 is set at the center of the condenser plate 2, which greatly ensures the condensation effect of the condenser plate 2, because the exhaust gas content decreases from the cone-shaped part of the condenser plate 2 upwards.

[0034] Furthermore, the bottom of the exhaust gas emitter 4 is connected to a first rod 15, the bottom end of which passes through and is rotatably mounted at the bottom of the condenser tank 1. The first rod 15 is driven by a motor 16. The bottom of the exhaust gas emitter 4 is also connected to an air inlet hose 17, the other end of which passes through the condenser tank 1 and is connected to an external air supply system. During operation, the external air supply system inputs exhaust gas into the air inlet hose 17, allowing the exhaust gas to flow into the exhaust gas emitter 4 through the air inlet hose 17 and then flow from the exhaust gas emitter 4 to the condenser plate 2. Then, in conjunction with the motor 16, the first rod 15 and the exhaust gas emitter 4 are rotated, so that the exhaust gas discharged from the exhaust gas emitter 4 can contact different conical positions of the condenser plate 2, making full use of the condensation area of ​​the condenser plate 2.

[0035] Furthermore, a thin plate 18 is fixed on the side of the exhaust gas emitter 4 near the inner wall of the condenser tank 1, and the thin plate 18 is arranged vertically. When the motor 16 drives the first rod 15 to rotate, the exhaust gas emitter 4 will drive the thin plate 18 to rotate. The thin plate 18 fans the air around the exhaust gas emitter 4, causing some air to flow upward along the inner wall of the condenser tank 1, thereby blocking the exhaust gas from flowing along the condenser plate 2 and then flowing to the inner wall of the condenser tank 1.

[0036] In use, the external gas supply system introduces exhaust gas into the intake hose 17, allowing the exhaust gas to flow into the exhaust emitter 4 and then from the exhaust emitter 4 towards the condenser plate 2. Then, the motor 16 drives the first rod 15 and the exhaust emitter 4 to rotate, ensuring that the exhaust gas discharged from the exhaust emitter 4 can contact different conical surfaces of the condenser plate 2. This fully utilizes the condensation area of ​​the condenser plate 2. The exhaust gas flows directly towards the conical surface of the condenser plate 2 and upwards along the conical surface, achieving condensation of the exhaust gas. The conical shape of the condenser plate 2 increases the exhaust gas's surface area. The contact area between the exhaust gas and the condenser plate 2 serves two purposes: firstly, it increases the contact area and time between the exhaust gas and the condenser plate 2, and secondly, it increases the heat dissipation area of ​​the condenser plate 2, thus improving the cooling effect on the exhaust gas. The baffle ring 5 restricts the flow path of the exhaust gas, thereby increasing the contact area and time between the exhaust gas and the condenser plate 2, and improving the condensation effect. Since the amount of exhaust gas decreases as it flows upward along the condenser plate 2, the size of the baffle ring 5 is designed to decrease gradually, ensuring the condensation effect. Meanwhile, manufacturing costs are reduced; the second recess 6 further increases the contact area between the exhaust gas and the condenser plate 2, and increases the residence time of the exhaust gas on the condenser plate 2, thus improving the condensation effect of the exhaust gas; the heat dissipation fins 7 improve the condensation effect of the condenser plate 2, allowing the heat on the condenser plate 2 to be quickly transferred to the cooling water, ensuring the condensation effect of the condenser plate 2 itself; the guide plate 8 facilitates the downward flow of the exhaust gas after condensation at the guide plate 8; the external delivery system inputs cold water from the inlet pipe 13 into the annular outlet pipe 12, allowing the cold water to flow downwards after condensation. Deposits begin to accumulate at the top center of condenser plate 2 and gradually fill the entire area above condenser plate 2, guide plate 8, and mounting plate 9, keeping condenser plate 2 in a cooling state. When the water temperature above condenser plate 2, guide plate 8, and mounting plate 9 increases, this water can be pumped out from drain pipe 14 through a pumping system, thus ensuring that the water above condenser plate 2, guide plate 8, and mounting plate 9 remains in a cooling state. In the above, the annular water outlet pipe 12 is placed at the center of condenser plate 2, which greatly ensures the condensation effect of condenser plate 2, because the exhaust gas content decreases from the cone-shaped part of condenser plate 2 upwards.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A tail gas condensation device for the production of o-nitroaniline, characterized in that: The condenser includes a cylindrical condenser (1), a conical condenser plate (2) is provided on the lower side of the top of the condenser (1), the condenser plate (2) is arranged vertically with the cone head facing down, a plurality of first recesses (3) are arranged on the lower surface of the condenser plate (2), and an exhaust gas emitter (4) is rotatably arranged below the condenser plate (2), and the exhaust area of ​​the exhaust gas emitter (4) is directly opposite the conical surface of the condenser plate (2). The bottom of the exhaust gas emitter (4) is connected to a rod (15), the bottom end of the rod (15) is inserted through and rotatably set at the bottom of the condenser (1), and the rod (15) is driven by a motor (16). The bottom of the exhaust gas emitter (4) is also connected to an air intake hose (17), the other end of the air intake hose (17) is inserted through the condenser (1) and connected to the external gas supply system. The exhaust gas emitter (4) has a thin plate (18) fixed on one side near the inner wall of the condenser (1), and the thin plate (18) is arranged vertically.

2. The tail gas condensation device for o-nitroaniline production according to claim 1, characterized in that, The lower surface of the condenser plate (2) is also provided with a plurality of retaining rings (5) spaced apart, and the size of the retaining rings (5) gradually decreases from bottom to top along the generatrix of the condenser plate (2).

3. The tail gas condensation device for o-nitroaniline production according to claim 2, characterized in that, The cross-section of the retaining ring (5) is an isosceles triangle, and the side of the retaining ring (5) that contacts the condenser 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, All of the retaining rings (5) have multiple second recesses (6) on their surfaces.

5. The tail gas condensation device for o-nitroaniline production according to claim 1, characterized in that, The upper surface of the condenser plate (2) is provided with multiple heat dissipation fins (7).

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

7. A 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 condenser plate (2). The mounting plate (9) is detachably connected to the inner wall of the condenser tank (1). A support ring (10) is fixed to the inner wall of the condenser tank (1). The support ring (10) includes a horizontal ring (101) in the horizontal direction 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 condenser tank (1). The side of the mounting plate (9) away from the guide plate (8) is in close contact with the rubber layer (11).

8. A tail gas condensation device for o-nitroaniline production according to claim 7, characterized in that, Cooling water is filled above the condenser plate (2), the guide plate (8) and the mounting plate (9). An annular water outlet pipe (12) is provided at the center of the condenser plate (2). An inlet pipe (13) is fixed at the top of the annular water outlet pipe (12), and one end of the inlet pipe (13) extends out of the condenser tank (1) and is connected to the external water supply system. Multiple drain pipes (14) are provided at the top of the condenser tank (1), and the drain pipes (14) are connected to the external water pumping system.

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