Internal circulation loop reactor and equipment

Abstract

The utility model relates to the technical field of waste alkali liquor treatment in the petrochemical industry production process, in particular to an internal circulation loop reactor and equipment. The internal circulation loop reactor comprises a housing, the top of which is provided with a tail gas outlet and the bottom of which is provided with a discharge port; the plurality of guide cylinders are the same in structure and are sequentially arranged in the housing from bottom to top; the guide cylinder comprises a cylinder body, a sieve plate and a guide wall, the sieve plate is arranged on the bottom end face of the cylinder body, and the guide wall is arranged on the edge of the bottom end face of the cylinder body and inclines outwards; the gas-liquid mixture conveying assembly comprises a gas-liquid outlet end, and the gas-liquid outlet end extends into the guide cylinder through the housing so as to convey a gas-liquid mixture into the guide cylinder; and gaps are formed between the adjacent guide cylinders and at the guide walls, so that part of gas and part of liquid can flow downwards along the guide walls. Kinetic energy needed by circulation is smaller, and more energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste alkali solution treatment in the petrochemical production process, in particular to an internal circulation loop reactor and equipment. Background Art

[0002] Waste alkali liquid is a waste liquid containing a large amount of pollutants produced by the use of NaOH solution to absorb H2S, alkali-washed oil and cracked gas in the petrochemical production process. Because it contains inorganic and organic sulfides such as sulfides and mercaptans, the waste alkali liquid has an unpleasant odor. Waste alkali liquid is highly alkaline. If it is not properly pretreated, high-concentration waste alkali liquid will inhibit the growth and reproduction of microorganisms after entering the sewage biochemical treatment system. In severe cases, it can cause a large number of microorganisms to die, thereby affecting the normal operation of the sewage treatment plant and the compliance of the total wastewater discharge. The main components of the waste liquid pollutants are odorous and toxic sulfides (Na2S, mercaptans, thiophenols and thioethers, etc.), phenols, sodium salts of cyclohexane acids, oils, heterocyclic aromatic hydrocarbons and free sodium hydroxide residues from the reaction. The types and concentrations of its pollutants vary greatly depending on the type of crude oil processed and the processing process. The treatment of waste alkali liquid has always been a core issue that plagues water pollution control in my country's refineries and ethylene plants.

[0003] With the increase in high-sulfur crude oil processing volume and the continuous expansion of the scale of ethylene plants, the discharge of waste alkali liquid has also increased. The treatment of waste alkali liquid has attracted the attention of researchers.

[0004] Therefore, there is an urgent need for an internal circulation loop reactor to treat waste alkali liquor. Utility Model Content

[0005] The utility model aims to provide an internal circulation loop reactor, which can solve the problem of treatment of waste alkali liquid.

[0006] The utility model provides an internal circulation loop reactor in a first aspect, comprising:

[0007] The cover shell has an exhaust gas outlet at the top and a material discharge port at the bottom;

[0008] A plurality of guide tubes having the same structure, wherein the plurality of guide tubes are sequentially arranged in the housing from bottom to top;

[0009] The guide cylinder comprises a cylinder body, a sieve plate and a guide wall, wherein the sieve plate is arranged on the bottom end surface of the cylinder body, and the guide wall is arranged on the edge of the bottom end surface of the cylinder body and is inclined outwards;

[0010] The gas-liquid mixture transmission component comprises a gas-liquid outlet, wherein the gas-liquid outlet extends into the guide tube through the housing so as to transport the gas-liquid mixture into the guide tube; wherein,

[0011] Between adjacent guide tubes, gaps are formed at the guide walls so that part of the gas and part of the liquid can flow downward along the guide walls.

[0012] In some practicable embodiments, the top of the housing is an arched wall, and the exhaust gas outlet is disposed in the central area of ​​the top wall; the bottom of the housing is an arched wall, and the discharge port is disposed in the central area of ​​the bottom wall.

[0013] In some embodied embodiments, the plurality of guide tubes include a first section of guide tube, a second section of guide tube, a third section of guide tube and a fourth section of guide tube, and the first section of guide tube, the second section of guide tube, the third section of guide tube and the fourth section of guide tube are sequentially arranged in the cover shell from bottom to top.

[0014] In some embodied embodiments, between the first and second flow guide tube sections, a gap with an outlet inclined downward is formed by the flow guide wall of the second flow guide tube section and the top edge of the cylinder body of the first flow guide tube section, so that part of the gas and part of the liquid can flow downward along the flow guide wall.

[0015] In some embodiments, the gas-liquid mixture transmission component includes a pipeline and an explosion disk;

[0016] The explosion disk is disposed in the bottommost flow guide tube among the plurality of flow guide tubes, and the explosion disk is communicated with one end of the pipeline so that the explosion disk forms the gas and liquid outlet.

[0017] In some practicable embodiments, a plurality of circular holes are provided on the sieve plate, and the circular holes of the sieve plate provided on the connected guide cylinder are staggered.

[0018] In some embodiments, the sieve plate is provided with 21 circular holes.

[0019] In some practicable embodiments, the free end of the guide wall is spaced a certain distance from the inner wall of the casing.

[0020] In some practicable embodiments, the sieve plate is provided on a top end surface of the topmost flow guide tube among the plurality of flow guide tubes.

[0021] The second aspect of the utility model provides a device, which includes the aforementioned internal circulation loop reactor.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides an internal circulation loop reactor, in which a multi-section guide tube is arranged in a housing, and a sieve plate and a guide wall are arranged on each guide tube. After the gas-liquid mixture enters the lowest guide tube through the gas-liquid outlet of the gas-liquid mixture transmission component, it moves upward in the multi-section guide tube. During the movement, the sieve plate is used to redistribute the gas-liquid mixture so as to fully back-mix and avoid the phenomenon of bias flow. The guide wall is used to make part of the gas and part of the liquid flow down along the guide wall, and then gradually rise with the injection kinetic energy of the gas to form a circulating flow, and continuously react with the intake air. From bottom to top, the gas-liquid ratio gradually increases, the oxygen content in the gas is gradually consumed, and the oxygen content gradually decreases. The top layer is basically pure air with oxygen consumed. The air utilization rate is high and the liquid content of the tail gas is low, which is easier to handle. In addition, the overall lifting height of the liquid is low, the kinetic energy required for the circulation is smaller, and it is more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the structure of an internal circulation loop reactor of the utility model;

[0026] Figure 2 The utility model is a schematic diagram of the sieve plate structure of an internal circulation loop reactor.

[0027] Description of reference numerals:

[0028] 1. Cover; 11. Exhaust gas outlet; 12. Discharge port;

[0029] 2. guide tube; 21. first section guide tube; 211. cylinder; 212. sieve plate; 213. guide wall; 22. second section guide tube; 23. third section guide tube; 24. fourth section guide tube;

[0030] 3. Gas-liquid mixture transmission component; 31. Pipeline; 32. Explosion disk. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The usual treatment method for waste alkali liquor is to use oxygen in the air to oxidize the sulfide in the ethylene waste alkali liquor into sodium thiosulfate or sulfate, thereby eliminating the odor in the ethylene waste alkali liquor, and at the same time oxidize part of the organic matter into carbon dioxide, reducing the COD concentration in the ethylene waste alkali liquor.

[0035] The airlift loop reactor is a gas-liquid two-phase reactor and a gas-liquid-solid three-phase reactor developed as a chemical reactor and a biochemical reactor. The airlift loop reactor uses the jet kinetic energy of the reaction gas and the circulating flow of the liquid to stir the reaction materials, so it has the advantages of simple structure, low cost, easy sealing, low energy consumption, and will not damage biological cells due to mechanical stirring. It is widely used in chemical industry, petrochemical industry, biochemical industry, food industry, pharmaceutical engineering and environmental protection. After the structural dimensions of the airlift loop reactor are properly designed, a good circulation intensity of the circulation flow can be obtained, a good circulation is formed in the airlift loop reactor, and the stirring of the solid catalyst particles is promoted. Therefore, the airlift loop reactor is very beneficial for mixing, diffusion, heat transfer and mass transfer between reactants. It is suitable for processing large-volume high-viscosity fluids and heat-sensitive biological substances. It can also be used for heterogeneous chemical reactions between gas-liquid two-phase or gas-liquid-solid three-phase. According to the form of the downcomer of the airlift loop reactor, the loop reactor can be divided into two types: internal loop reactor and external loop reactor.

[0036] The treatment of waste alkali liquid is a gas-liquid oxidation reaction process, and a loop reactor can be used as a good method. Therefore, the utility model provides a multi-layer internal circulation loop reactor to achieve the purpose of better treating waste alkali liquid.

[0037] like Figure 1 As shown, Figure 1 The direction of the arrow in the middle is the flow direction of the gas-liquid mixture. In a first aspect, the utility model provides an internal circulation loop reactor, comprising a housing 1, a plurality of guide tubes 2 and a gas-liquid mixture transmission component 3.

[0038] The top of the housing 1 is provided with an exhaust outlet 11, and the bottom is provided with a discharge port 12. The housing 1 is a barrel-shaped structure, and the two ends of the housing 1 can be designed into an arched structure as needed, that is, the top of the housing 1 is an arched wall, and the center area of ​​the top wall is provided with an exhaust outlet 11; the bottom of the housing 1 is an arched wall, and the center area of ​​the bottom wall is provided with a discharge port 12. The arched structure facilitates the convergence of gas and liquid.

[0039] A plurality of guide tubes 2 having the same structure are arranged in sequence from bottom to top in the housing 1 .

[0040] Specifically, the plurality of guide tubes 2 may include a first section guide tube 21, a second section guide tube 22, a third section guide tube 23 and a fourth section guide tube 24, which are sequentially arranged from bottom to top in the housing 1. The first section guide tube 21, the second section guide tube 22, the third section guide tube 23 and the fourth section guide tube 24 each include a cylinder 211, a sieve plate 212 and a guide wall 213, the sieve plate 212 is arranged on the bottom end surface of the cylinder 211, and the guide wall 213 is arranged on the edge of the bottom end surface of the cylinder 211 and is inclined outward. That is to say, between the first section guide tube 21 and the second section guide tube 22, the guide wall 213 of the second section guide tube 22 and the top edge of the cylinder body 211 of the first section guide tube 21 form a gap with an outlet inclined downward, so that part of the gas and part of the liquid can flow downward along the guide wall 213.

[0041] The gas-liquid mixture transmission component 3 includes a gas-liquid outlet end, which extends through the housing 1 to the first section flow guide cylinder 21 so as to transport the gas-liquid mixture into the first section flow guide cylinder 21 .

[0042] Specifically, the gas-liquid mixture transmission component 3 includes a pipeline 31 and an explosion disk 32; the explosion disk 32 is located in the bottommost guide tube 2 among the multiple guide tubes 2, and the explosion disk 32 is connected to one end of the pipeline 31 so that the explosion disk 32 forms a gas-liquid outlet.

[0043] It should be noted that one end of the pipeline 31 is connected to the outlet of the gas-liquid mixture through the explosion disk 32, so that the gas-liquid mixture passes through the pipeline 31, reaches the explosion disk 32, and then enters the first section of the guide tube 21 through the explosion disk 32. The explosion disk 32 is used to explode in the first section of the guide tube 21 to allow the gas and liquid to fully react and mix.

[0044] like Figure 2 As shown, it should be noted that a plurality of circular holes are provided on the sieve plate 212, and the circular holes of the sieve plate 212 provided on the connected guide cylinder 2 are staggered. This allows the gas-liquid mixture to be redistributed on the sieve plate 212, fully back-mixed, and avoids the phenomenon of biased flow. Further, in order to adapt to the size of the cylinder 211 and avoid excessive or insufficient gas-liquid mixing, 21 circular holes are provided on the sieve plate 212.

[0045] Finally, it should be noted that the end of the guide wall 213 away from the guide cylinder, that is, the free end, is spaced a certain distance from the inner wall of the housing 1. In order to form a gap between the free end of the guide wall 213 and the inner wall of the housing 1, it is convenient for gas and liquid to flow. The guide wall 213 can be made of the same material as the cylinder 211 and be integrally constructed for easy processing.

[0046] The utility model provides an internal circulation loop reactor, which can form gaps between adjacent guide tubes 2 at the guide walls 213 so that part of the gas and part of the liquid can flow downward along the guide walls 213 .

[0047] In one embodiment, a sieve plate 212 is disposed at the top end surface of the topmost flow guide tube 2 among the plurality of flow guide tubes 2. That is, the sieve plate 212 is disposed at the top end surface of the fourth section flow guide tube 24 to further improve the gas-liquid mixing reaction.

[0048] In summary, the internal circulation loop reactor provided by the utility model can be composed of four sections, each section has a structure similar to the guide tube 2, each section has a layer of sieve plate 212 at the bottom, each sieve plate 212 has 21 circular holes evenly distributed, and the gas-liquid mixture is redistributed on the sieve plate 212 to fully backmix and avoid the phenomenon of biased flow.

[0049] After the gas-liquid mixture enters the first section guide tube 21, it flows upward together with the gas flotation. Because there is a certain resistance at the sieve plate 212, the sieve plate 212 plays a role of redistribution and diversion. Most of the gas and part of the liquid will enter the sieve plate 212 and continue to rise, and a small part of the gas and part of the liquid will flow down along the guide wall 213, and then form a circular flow as the injection kinetic energy of the gas gradually rises, and continuously react with the intake air.

[0050] The gas-liquid ratio of the internal circulation loop reactor increases gradually from bottom to top, the oxygen content in the gas is gradually consumed, and the oxygen content gradually decreases. The top layer is basically pure air with oxygen consumed. The air utilization rate is high and the liquid content of the tail gas is low, which is easier to handle. In addition, the overall lifting height of the liquid is low, the kinetic energy required for circulation is smaller, and it is more energy-saving.

[0051] The gas-liquid ratio of the reaction liquid in the lower draft tube 2 is small, and the single cycle reaction time is short, but the gas oxygen content is large, the liquid flow rate is large, the flow rate is fast, and the number of cycles is large; the gas-liquid ratio of the reaction liquid in the upper draft tube 2 is large, and the single cycle reaction time is long, but the oxygen content is small, and the number of cycles is small. Overall, the reaction degree of the internal circulation loop reactor is uniform everywhere, and there is no dead zone. And because the flow rate at the water inlet is large, the reaction liquid can be better mixed with the water inlet, and the mixing effect is better.

[0052] The second aspect of the utility model provides a device, which includes the aforementioned internal circulation loop reactor.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An internal circulation loop reactor, characterized in that: include: The cover shell has an exhaust gas outlet at the top and a material discharge port at the bottom; A plurality of guide tubes having the same structure, wherein the plurality of guide tubes are sequentially arranged in the housing from bottom to top; The guide cylinder comprises a cylinder body, a sieve plate and a guide wall, wherein the sieve plate is arranged on the bottom end surface of the cylinder body, and the guide wall is arranged on the edge of the bottom end surface of the cylinder body and is inclined outwards; The gas-liquid mixture transmission component comprises a gas-liquid outlet end, wherein the gas-liquid outlet end extends into the guide tube through the housing so as to transport the gas-liquid mixture into the guide tube; wherein, Between adjacent guide tubes, gaps are formed at the guide walls so that part of the gas and part of the liquid can flow downward along the guide walls.

2. The internal circulation loop reactor according to claim 1, characterized in that: The top of the housing is an arched wall, and the exhaust gas outlet is arranged in the central area of ​​the top wall; the bottom of the housing is an arched wall, and the discharge port is arranged in the central area of ​​the bottom wall.

3. The internal circulation loop reactor according to claim 1, characterized in that: The plurality of guide tubes include a first section guide tube, a second section guide tube, a third section guide tube and a fourth section guide tube, and the first section guide tube, the second section guide tube, the third section guide tube and the fourth section guide tube are sequentially arranged in the cover shell from bottom to top.

4. The internal circulation loop reactor according to claim 3, characterized in that: Between the first section flow guide tube and the second section flow guide tube, the flow guide wall of the second section flow guide tube and the top edge of the cylinder body of the first section flow guide tube form a gap with an outlet inclined downward, so that part of the gas and part of the liquid can flow downward along the flow guide wall.

5. The internal circulation loop reactor according to claim 1, characterized in that: The gas-liquid mixture transmission component includes a pipeline and a gas explosion disk; The explosion disk is disposed in the bottommost flow guide tube among the plurality of flow guide tubes, and the explosion disk is communicated with one end of the pipeline so that the explosion disk forms the gas and liquid outlet.

6. The internal circulation loop reactor according to claim 1, characterized in that: The sieve plate is provided with a plurality of circular holes, and the circular holes of the sieve plate provided on the connected guide cylinder are staggered.

7. The internal circulation loop reactor according to claim 6, characterized in that: The sieve plate is provided with 21 circular holes.

8. The internal circulation loop reactor according to claim 1, characterized in that: The free end of the guide wall is spaced a certain distance from the inner wall of the housing.

9. The internal circulation loop reactor according to claim 1, characterized in that: The sieve plate is provided on the top end surface of the topmost flow guide tube among the plurality of flow guide tubes.

10. A device, characterized in that: The device comprises the internal circulation loop reactor according to any one of claims 1 to 9.

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