A crude benzene hydrogenation tail gas recovery and treatment equipment

Abstract

The invention discloses a crude benzene hydrogenation tail gas recovery and processing equipment, including a desulfurization tank, a hydrogen flash tank, an oxidation regeneration tank, an air compressor, an air compression tank, an oxygen flash tank, a plate-frame filter, and a sulfur melting kettle. The oxidation regeneration tank is provided with a guide tube, a motor, and a mesh plate. The guide tube is coaxially arranged with the tank body of the oxidation regeneration tank. The guide tube divides the space in the tank body into an internal oxidation reaction zone and an external sedimentation zone. The oxidation gas delivery pipe exhausts into the oxidation reaction zone. The mesh plate is interlaced with branches inside to form a plate-like structure. The motor drives the mesh plate to rotate in the oxidation reaction zone. The invention improves the oxidation regeneration efficiency and equipment safety of complex iron desulfurization.

Description

Technical Field

[0001] The invention relates to the technical field of crude benzene hydrogenation, in particular to a crude benzene hydrogenation tail gas recovery and processing device. Background Art

[0002] Crude benzene hydrogenation tail gas mainly refers to the high concentration of H 2 S acidic gas, due to H 2 S is a highly hazardous gas with characteristics such as toxicity and stench. Direct incineration will seriously corrode equipment. In addition, the hydrocarbon components and hydrogen content in the tail gas are very high. If it is burned through a torch, it will waste gas resources and produce acidic gas SO. 2 Discharge into the atmosphere will cause serious air pollution.

[0003] The complex iron treatment process is a kind of 2 The technology of large-scale desulfurization of S is that trivalent iron first oxidizes hydrogen sulfide into elemental sulfur under alkaline conditions, and at the same time, trivalent iron becomes divalent iron, and then oxygen is introduced to oxidize it back to trivalent iron, and the process is repeated for recycling. Oxidation regeneration is an extremely important part of the whole process. Common regeneration methods include bubble tower regeneration and tank jet regeneration, which are easily blocked by the generated elemental sulfur and have poor mass transfer effect. Patent 201811468468.8 discloses a regeneration device, regeneration system and

[0004] The regeneration method avoids the clogging problem of sulfur particles by setting a guide tube in the cylindrical reactor to divide the internal space into a degassing sedimentation zone, a sulfur particle enrichment zone, and an oxidation reaction zone. However, this method reduces the volume of the oxidation reaction zone. After the oxidizing gas enters the oxidation reaction zone, it floats directly and is not dispersed into small bubbles. The bubble diameter is large, the gas-liquid reaction contact surface is small, and the oxidation reaction efficiency needs to be further improved. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a crude benzene hydrogenation tail gas recovery and treatment device which avoids sulfur blockage in an oxidation regeneration tank and improves the efficiency of complex iron desulfurization oxidation regeneration.

[0006] The purpose of the present invention is achieved through the following technical solutions: a crude benzene hydrogenation tail gas recovery and processing equipment, including a desulfurization tank, a hydrogen flash tank, an oxidation regeneration tank, an air compressor, an air compression tank, an oxygen flash tank, a plate and frame filter, and a sulfur melting kettle. The desulfurization tank is connected to the inlet of the hydrogen flash tank through a desulfurization liquid discharge pipe. The desulfurization tank is also provided with a waste gas delivery pipe for transporting upstream acidic gas, a liquid replenishment pipe for transporting an additional desulfurizer, and a hydrogen recovery pipe. The hydrogen flash tank is provided with a hydrogen discharge pipe. The hydrogen flash tank is connected to the oxidation regeneration tank through a regeneration liquid delivery pipe. The air compression tank is connected to the oxidation regeneration tank through an oxidation gas delivery pipe. The oxidation regeneration tank is connected to the oxygen flash tank through a regeneration liquid discharge pipe. The oxidation regeneration tank is provided with a waste gas discharge pipe. The oxidation regeneration tank is discharged through a sulfur-rich liquid discharge pipe. It is connected to a plate and frame filter, and the filtered liquid of the plate and frame filter is connected to an oxidation regeneration tank through a recovery liquid pipe. The oxygen flash tank discharges the oxidizing gas through an oxygen discharge pipe. The oxygen flash tank is connected to a desulfurization tank through a flash liquid discharge pipe. The solid material discharge port of the plate and frame filter is connected to the inlet of the molten sulfur kettle. The liquid of the plate and frame filter is connected to the oxidation regeneration tank through a recovery liquid pipe. A guide tube, a motor and a mesh plate are provided on the oxidation regeneration tank. The guide tube is coaxially arranged with the tank body of the oxidation regeneration tank. The guide tube divides the space in the tank body into an internal oxidation reaction zone and an external sedimentation zone. The oxidizing gas delivery pipe exhausts gas into the oxidation reaction zone. The mesh plate is internally connected and staggered to form a plate-like structure. The motor drives the mesh plate to rotate in the oxidation reaction zone.

[0007] Preferably, a heating device for heating the desulfurizer in the guide tube is provided in the oxidation reaction zone, and a cooling device for cooling the elemental sulfur in the guide tube is provided in the sedimentation zone.

[0008] Preferably, a vortex tube is provided in the tank body, and the vortex tube includes a heat pipe for discharging hot air, a cold pipe for discharging cold air, and an air intake pipe for guiding the vortex movement of the gas. The heat pipe extends to the oxidation reaction zone, and a cooling pipe is provided at the end of the cold pipe. The cooling pipe extends to the sedimentation zone, and the air intake pipe is connected to the oxidation gas delivery pipe.

[0009] Preferably, a plurality of Venturi injectors are provided in the tank body, and the Venturi injectors are horizontally radially arranged with the central axis of the tank body as the center, and the spray ports of the Venturi injectors are toward the inner wall of the tank body. The Venturi injectors are located below the liquid surface of the desulfurizer and above the guide tube, the regeneration liquid delivery pipe is connected to the liquid inlet of the Venturi injector, and the cooling pipe is connected to the gas inlet of the Venturi injector.

[0010] Preferably, a centrifugal plate for rotating the desulfurizer is provided in the tank body, the centrifugal plate is located above the guide cylinder, and the centrifugal plate is coaxially arranged with the mesh plate.

[0011] Preferably, the centrifugal plate is a rectangular plate, the centrifugal plate is vertically arranged, and the centrifugal plate extends from the center of the tank body to the inner wall of the tank body.

[0012] Preferably, an annular flow partition is provided in the sedimentation zone, and a plurality of openings for allowing elemental sulfur particles to pass through are provided on the flow partition. The flow partition divides the upper part of the sedimentation zone into a countercurrent reaction zone, and the end of the cooling tube extends to the bottom of the countercurrent reaction zone.

[0013] Preferably, the area of ​​the flow partitioning plate that is not perforated is provided with a plurality of cone blocks for guiding the sedimentation of the elemental sulfur particles.

[0014] Preferably, the cooling pipe passes through the sedimentation zone, and a baffle is provided at the end of the cooling pipe, and the baffle guides the gas in the cooling pipe to be blown out horizontally from the center of the tank body to the inner wall.

[0015] Preferably, the baffle tube is C-shaped, the bottom end opening of the baffle tube is connected to the outlet of the cooling tube, and the gas in the baffle tube is directly discharged from bottom to top.

[0016] The present invention has the following advantages:

[0017] 1. The guide tube is arranged to divide the area inside the oxidation regeneration tank into an internal oxidation reaction zone and an external sedimentation zone, forming an annular flow. The desulfurizer discharged from the hydrogen flash tank contains a large number of elemental sulfur particles. Through the above arrangement, a large number of elemental sulfur particles can be preferentially allowed to enter the sedimentation zone for sedimentation, thereby reducing the power output pressure of the annular flow and further avoiding the problem of gas outlet blockage; the addition of the air compressor and the air compression tank can realize the high-pressure introduction of the oxidizing gas in the desulfurizer, thereby increasing the oxidizing gas content in the single desulfurizer and improving the gas-liquid reaction efficiency; the addition of the oxygen flash tank can realize the removal of excess oxygen in the regeneration liquid, thereby improving the safety and reliability of the device.

[0018] 2. The heating device installed in the oxidation reaction zone cooperates with the cooling device installed in the sedimentation zone to further promote the efficiency of oxidation regeneration, while accelerating the sedimentation efficiency of elemental sulfur particles, thereby improving the desulfurization capacity of the complex iron desulfurizer as a whole.

[0019] 3. The crude benzene hydrodesulfurization device of the present invention has a simple equipment structure, fewer components, and can operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structural connection of the present invention;

[0021] Figure 2 Schematic diagram of the cross-sectional structure of the oxidation regeneration tank of Example 1 of the present invention;

[0022] Figure 3 It is a schematic cross-sectional structural diagram of an oxidation regeneration tank according to Embodiment 2 of the present invention;

[0023] Figure 4 It is a schematic cross-sectional structure diagram of the oxidation regeneration tank of Example 3 of the present invention.

[0024] In the figure, 1, desulfurization tank; 11, waste gas delivery pipe; 12, liquid replenishment pipe; 13, hydrogen recovery pipe; 14, desulfurization liquid discharge pipe; 2, hydrogen flash tank; 21, hydrogen discharge pipe; 3, oxidation regeneration tank; 31, regeneration liquid delivery pipe; 32, oxidation gas delivery pipe; 33, regeneration liquid discharge pipe; 34, sulfur-rich liquid discharge pipe; 35, waste gas discharge pipe; 4, air compressor; 5, air compressor tank; 6, oxygen flash tank; 61, oxygen discharge pipe; 62, flash liquid discharge Tube; 7, plate and frame filter; 71, recovery liquid pipe; 8, molten sulfur kettle; 9, tank body; 91, guide tube; 92, vortex tube; 93, heat pipe; 94, air intake pipe; 95, cold pipe; 96, cooling pipe; 97, Venturi ejector; 98, mesh plate; 99, motor; 10, centrifugal plate; 101, flow partition; 102, opening; 103, cone block; 104, baffle tube; A, oxidation reaction zone; B, sedimentation zone; C, baffle zone; D, countercurrent reaction zone. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1, as Figure 1As shown, a crude benzene hydrogenation tail gas recovery and processing equipment comprises a desulfurization tank 1, a hydrogen flash tank 2, an oxidation regeneration tank 3, an air compressor 4, an air compression tank 5, an oxygen flash tank 6, a plate-frame filter 7, and a sulfur melting kettle 8. The desulfurization tank 1 is connected to the inlet of the hydrogen flash tank 2 through a desulfurization liquid discharge pipe 14. The desulfurization tank 1 is also provided with a waste gas delivery pipe 11 for transporting upstream acidic gas, a liquid replenishment pipe 12 for transporting an additional desulfurizer, and a hydrogen recovery pipe 13. The hydrogen flash tank 2 is provided with a hydrogen The gas discharge pipe 21, the hydrogen flash tank 2 is connected to the oxidation regeneration tank 3 through the regeneration liquid delivery pipe 31, the air compression tank 5 is connected to the oxidation regeneration tank 3 through the oxidation gas delivery pipe 32, the oxidation regeneration tank 3 is connected to the oxygen flash tank 6 through the regeneration liquid discharge pipe 33, the oxidation regeneration tank 3 is provided with a waste gas discharge pipe 35, the oxidation regeneration tank 3 is connected to the plate and frame filter 7 through the sulfur liquid discharge pipe 34, the filtered liquid of the plate and frame filter 7 is connected to the oxidation regeneration tank 3 through the recovery liquid pipe, the oxygen flash tank 6 discharges the oxidation gas through the oxygen discharge pipe 61, the oxygen flash tank 6 is connected to the desulfurization tank 1 through the flash liquid discharge pipe 62, the solid material discharge port of the plate and frame filter 7 is connected to the inlet of the molten sulfur kettle 8, the liquid of the plate and frame filter 7 is connected to the oxidation regeneration tank 3 through the recovery liquid pipe 71, the oxidation regeneration tank 3 is provided with a guide tube 91, a motor 99, and a mesh plate 98, the guide tube 91 is connected to the middle part of the tank body 9 through a support rod, and the guide tube 91 is coaxial with the tank body 9 of the oxidation regeneration tank 3. The guide tube 91 is configured to divide the space inside the tank body 9 into an internal oxidation reaction zone A and an external sedimentation zone B. The oxidation gas delivery pipe 32 extends to the bottom of the guide tube 91, and the oxidation gas delivery pipe 32 exhausts gas into the oxidation reaction zone A. The mesh plate 98 is internally connected and staggered into a plate-like structure. The mesh plate 98 extends horizontally to the inner wall of the guide tube 91. The motor 99 drives the mesh plate 98 to rotate in the oxidation reaction zone A through the rotating shaft, and the rising airflow is broken up by the mesh plate 98 and dispersed into small bubbles.

[0028] Furthermore, a heating device for heating the desulfurizer in the guide tube 91 is provided in the oxidation reaction zone A. The heating device can increase the temperature in the oxidation reaction zone. The increase in the oxidation reaction is beneficial to accelerating the gas-liquid reaction. A cooling device for cooling the elemental sulfur in the guide tube 91 is provided in the sedimentation zone B. The cooling device can cool the sedimentation zone, which is beneficial for the elemental sulfur particles to aggregate and grow from small particles to large particles. At the same time, the reduction in temperature slows down the violent movement of the liquid and accelerates the sedimentation rate of the elemental sulfur particles.

[0029] In some embodiments, the heating device is configured as an inner coil into which a hot fluid is passed, the cooling device is configured as an inner coil into which a cold fluid is passed, and the oxidation gas delivery pipe 32 extends directly to the bottom of the guide tube 91 .

[0030] In some embodiments, a plurality of vortex tubes 92 are provided in the tank body 9. The vortex tubes 92 are existing devices that generate vortices in high-speed airflow to separate cold and hot airflows. The plurality of vortex tubes 92 are arranged around the bottom edge of the guide tube 91. The vortex tubes 92 include a heat pipe 93 for discharging hot air, a cold pipe 95 for discharging cold air, and an intake pipe 94 for guiding the vortex movement of the gas. The heat pipe 93 extends to the oxidation reaction zone A, and a cooling pipe 96 is provided at the end of the cold pipe 95. The cooling pipe 96 extends to the sedimentation zone B. The intake pipe 94 is connected to the oxidation gas delivery pipe 32. The cooling pipe 96 is arranged close to the inner wall of the tank body 9. The cooling pipe 96 can be selected in a variety of shapes, and can be a dispersed inner coil or a hollow chamber plate structure, not limited to a single tube structure.

[0031] Further, such as Figure 2 As shown, a plurality of venturi injectors 97 are arranged in the tank body 9. The venturi injectors 97 are arranged horizontally and radially with the central axis of the tank body 9 as the center. The spray port of the venturi injector 97 faces the inner wall of the tank body 9. The venturi injector 97 is located below the liquid surface of the desulfurizer and above the guide tube 91. The regeneration liquid delivery pipe 31 is connected to the liquid inlet of the venturi injector 97. The cooling pipe 96 is connected to the gas inlet of the venturi injector 97. The venturi injector 97 injects the gas-liquid mixture toward the inner wall of the tank body 9 to form a baffle area C. The elemental sulfur particles in the baffle area C are accelerated to collide with the inner wall of the tank body 9. The closer to the inner wall of the tank body 9, the lower the temperature, which is more conducive to sedimentation. At the same time, the elemental sulfur particles are gathered at the edge of the inner wall, which is conducive to collision and contact to produce large particles, thereby further increasing the sedimentation rate.

[0032] Embodiment 2, as Figure 3 As shown, the difference between it and Example 1 is that a centrifugal plate 10 for rotating the desulfurizer is provided in the tank body 9, the centrifugal plate 10 is located above the guide tube 91, the centrifugal plate 10 is coaxially arranged with the mesh plate 98, the centrifugal plate 10 is a rectangular plate, the centrifugal plate 10 is vertically arranged, and the centrifugal plate 10 extends from the center of the tank body 9 to the inner wall of the tank body 9, and an annular flow partition 101 is provided in the sedimentation zone B. The flow partition 101 is provided with a plurality of openings 102 for allowing elemental sulfur particles to pass through. The flow partition 101 divides the upper part of the sedimentation zone B into a countercurrent reaction zone D. The setting of the countercurrent reaction zone D can extend the duration of the gas-liquid oxidation reaction and improve the single-cycle oxidation capacity. At the same time, the countercurrent movement can hinder the floating of bubbles, thereby further improving the reaction efficiency. The end of the cooling tube 96 extends to the bottom of the countercurrent reaction zone D, and the area of ​​the flow partition 101 without the opening 102 is provided with a plurality of cone blocks 103 for guiding the sedimentation of elemental sulfur particles.

[0033] Embodiment 3, as Figure 4As shown, the difference between it and Example 1 is that the cooling tube 96 passes through the sedimentation zone B, and a deflector 104 is provided at the end of the cooling tube 96 to accelerate the elemental sulfur to impact the inner wall. The deflector 104 guides the gas in the cooling tube 96 to be blown out horizontally from the center of the tank body 9 to the inner wall. The deflector 104 is C-shaped, and the bottom end opening of the deflector 104 is connected to the outlet of the cooling tube 96. The deflector 104 is vertically arranged, and the gas in the deflector 104 is directly discharged from bottom to top. The deflector 104 is located above the guide tube 91, and the gas therein is heated up after being heat transferred by the high-temperature desulfurizer below, forming a pressure state in which the upper part is a hot air flow and the lower part is a cold air flow, which can promote the discharge of gas in the cooling tubes 96 with different structures, so as to achieve the purpose of ensuring the normal operation of the vortex tube 92.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A crude benzene hydrogenation tail gas recovery and treatment device, comprising a desulfurization tank (1), a hydrogen flash tank (2), an oxidation regeneration tank (3), an air compressor (4), an air compression tank (5), an oxygen flash tank (6), a plate-frame filter (7), and a sulfur melting kettle (8), wherein the desulfurization tank (1) is connected to the inlet of the hydrogen flash tank (2) through a desulfurization liquid discharge pipe (14), and the desulfurization tank (1) is also provided with a waste gas delivery pipe (11) for transporting upstream acidic gas, a liquid replenishment pipe (12) for transporting an additional desulfurizer, and a hydrogen recovery pipe (13), and the hydrogen flash tank (2) is provided with a hydrogen The hydrogen flash tank (2) is connected to the oxidation regeneration tank (3) through the regeneration liquid delivery pipe (31), the air compression tank (5) is connected to the oxidation regeneration tank (3) through the oxidation gas delivery pipe (32), the oxidation regeneration tank (3) is connected to the oxygen flash tank (6) through the regeneration liquid discharge pipe (33), the oxidation regeneration tank (3) is provided with a waste gas discharge pipe (35), the oxidation regeneration tank (3) is connected to the plate and frame filter (7) through the sulfur-rich liquid discharge pipe (34), and the filtered liquid of the plate and frame filter (7) is connected to the oxidation regeneration tank ( 3), the oxygen flash tank (6) discharges the oxidizing gas through the oxygen discharge pipe (61), the oxygen flash tank (6) is connected to the desulfurization tank (1) through the flash liquid discharge pipe (62), the solid material discharge port of the plate and frame filter (7) is connected to the inlet of the molten sulfur kettle (8), and the liquid of the plate and frame filter (7) is connected to the oxidation regeneration tank (3) through the recovery liquid pipe (71), and the oxidation regeneration tank (3) is provided with a guide tube (91), a motor (99), and a mesh plate (98), and the guide tube (91) and the tank body (9) of the oxidation regeneration tank (3) are connected. The guide tube (91) is coaxially arranged to divide the space in the tank body (9) into an internal oxidation reaction zone and an external sedimentation zone. The oxidation gas delivery pipe (32) exhausts gas into the oxidation reaction zone. The mesh plate (98) is internally connected and staggered to form a plate-like structure. The motor (99) drives the mesh plate (98) to rotate in the oxidation reaction zone. A heating device for heating the desulfurizer in the guide tube (91) is provided in the oxidation reaction zone. A cooling device for cooling the elemental sulfur in the guide tube (91) is provided in the sedimentation zone. The invention is characterized in that: A vortex tube (92) is arranged in the tank body (9), and the vortex tube (92) comprises a heat pipe (93) for discharging hot gas, a cold pipe (95) for discharging cold gas, and an air intake pipe (94) for guiding the vortex movement of the gas. The heat pipe (93) extends to the oxidation reaction zone, and a cooling pipe (96) is arranged at the end of the cold pipe (95). The cooling pipe (96) extends to the sedimentation zone. The air intake pipe (94) is connected to the oxidation gas delivery pipe (32).

2. A crude benzene hydrogenation tail gas recovery and processing equipment according to claim 1, characterized in that: A plurality of Venturi injectors (97) are arranged in the tank body (9). The Venturi injectors (97) are arranged horizontally and radially with the central axis of the tank body (9) as the center. The spray ports of the Venturi injectors (97) face the inner wall of the tank body (9). The Venturi injectors (97) are located below the liquid surface of the desulfurizer and above the guide tube (91). The regeneration liquid delivery pipe (31) is connected to the liquid inlet of the Venturi injector (97), and the cooling pipe (96) is connected to the gas inlet of the Venturi injector (97).

3. A crude benzene hydrogenation tail gas recovery and processing equipment according to claim 1, characterized in that: A centrifugal plate (10) for causing the desulfurizer to rotate is arranged in the tank body (9); the centrifugal plate (10) is located above the guide cylinder (91); and the centrifugal plate (10) is coaxially arranged with the mesh plate (98).

4. A crude benzene hydrogenation tail gas recovery and processing equipment according to claim 3, characterized in that: The centrifugal plate (10) is a rectangular plate. The centrifugal plate (10) is arranged vertically. The centrifugal plate (10) extends from the center of the tank body (9) to the inner wall of the tank body (9).

5. The crude benzene hydrogenation tail gas recovery and processing equipment according to claim 3 is characterized in that: An annular flow partition (101) is provided in the sedimentation zone, and a plurality of openings (102) are provided on the flow partition (101) for allowing elemental sulfur particles to pass through. The flow partition (101) divides the upper part of the sedimentation zone into a countercurrent reaction zone, and the end of the cooling tube (96) extends to the bottom of the countercurrent reaction zone.

6. A crude benzene hydrogenation tail gas recovery and processing equipment according to claim 5, characterized in that: A plurality of cone blocks (103) for guiding the sedimentation of elemental sulfur particles are arranged in the area of ​​the flow partition (101) that is not provided with holes (102).

7. The crude benzene hydrogenation tail gas recovery and processing equipment according to claim 1 is characterized in that: The cooling pipe (96) passes through the settling area, and a baffle pipe (104) is provided at the end of the cooling pipe (96), wherein the baffle pipe (104) guides the gas in the cooling pipe (96) to be blown out horizontally from the center of the tank body (9) to the inner wall.

8. The crude benzene hydrogenation tail gas recovery and processing equipment according to claim 7 is characterized in that: The baffle tube (104) is C-shaped, and the bottom opening of the baffle tube (104) is connected to the outlet of the cooling tube (96), so that the gas in the baffle tube (104) is directly discharged from bottom to top.

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