A double reflux jet enhanced premixing type liquid hydrocarbon desulfurization reactor, reaction system and method

Abstract

The application discloses a double reflux jet enhanced premixing type liquid hydrocarbon desulfurization reactor, a reaction system and a method, relates to the field of liquid hydrocarbon treatment, and the flow channel of the desulfurization reactor is provided with a premixing section and a full mixing section which are communicated with each other, the premixing section is provided with a double-layer premixing sleeve, the outlet of the inner sleeve is provided with a venturi type necking, a plurality of first reflux holes which can be used for refluxing the premixed liquid between the inner sleeve and the outer sleeve to the inner sleeve are further arranged on the sleeve wall of the inner sleeve, the outlet of the outer sleeve is provided with a horn-shaped flared opening, the horn-shaped flared opening and the desulfurization reactor shell form a second reflux hole, the starting end of the full mixing section is provided with a microporous dispersion structure, a part of the premixed liquid flowing out of the premixing section enters the full mixing section to be dispersed and mixed again, and the other part of the premixed liquid is blocked by the micropore dispersion structure and then is refluxed to the premixing flow section through the second reflux hole. The application is used for solving the technical problem that liquid hydrocarbon and absorbent two-phase contact is not sufficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of liquid hydrocarbon treatment, in particular to a double reflux injection enhanced premixing type liquid hydrocarbon desulfurization reactor, reaction system and method. BACKGROUND

[0002] With the continuous upgrading of environmental protection standards, the requirements of the state and local governments for SO2 emissions are becoming more and more stringent. The "Petroleum Refining Industrial Pollutant Discharge Standard" GB31570-2015 stipulates that: the existing enterprises sulfur recovery device shall execute the flue gas SO2 concentration emission limit value of 400mg / m 3 , 100mg / m 3 in key areas from July 1, 2017. Local governments have higher requirements for SO2 control, for example, according to the "Shandong Province Regional Atmospheric Pollutant Comprehensive Discharge Standard" DB37 / 2376-2013, it is required that the enterprises in the key control area of Shandong Province must execute the tail gas emission standard of sulfur dioxide limit value of 50mg / m 3 from January 1, 2020. It can be seen that the requirement for SO2 control will be more and more stringent. Therefore, it is urgent to control SO2 emission. In order to reduce the concentration of SO2, various measures are emerging in an endless stream, such as: liquid sulfur degassing process, two-stage absorption and two-stage regeneration, optimization of tail gas absorption operating conditions and high-efficiency desulfurizer, etc. But these measures are difficult to control SO2 in flue gas to less than 100mg / m 3 , and it is more difficult to achieve less than 50mg / m 3 .

[0003] The Chinese invention patent with application number 201811025464.2 discloses an internal circulation biological desulfurization reactor and method. The reactor main body is a cylindrical outer wall, which is divided into sulfur collection zone, water inlet zone and circulation reaction zone from bottom to top, and the sedimentation zone is arranged at the upper periphery of the cylindrical outer wall. The sulfur collection zone is provided with a sulfur discharge pipe, a spiral port, a sludge collection tank and an annular inclined plate; the water inlet zone is provided with a water inlet pipe, an aeration head, a gas guide pipe and a limiting rod; the circulation reaction zone is provided with an inner cylinder and a horn port; the sedimentation zone is provided with a sedimentation inclined surface, a mud flushing pipe, a water collecting port, an inclined plate and a water outlet pipe. The present application integrates sulfide oxidation and elemental sulfur separation into one, and has compact device structure and small land occupation. Through the optimization combination of the inner cylinder with the horn port, the gas stripping effect and the Venturi effect can be utilized to realize the high-efficiency internal circulation of the reaction liquid. The air provided by the aeration head passes through each zone in the cylindrical outer wall from bottom to top, and drives the reaction liquid in the inner cylinder to move upward, and the reaction liquid between the inner cylinder and the cylindrical outer wall moves downward, thereby generating internal circulation. In the process of desulfurization reaction of liquid hydrocarbon, the reaction mode of the internal circulation biological desulfurization reactor can improve the contact between the liquid hydrocarbon and the absorbent to some extent. In order to make the desulfurization of liquid hydrocarbon more thorough, the contact between the liquid hydrocarbon and the absorbent still needs to be improved. SUMMARY

[0004] The present application aims to provide a double reflux jet enhanced premixed liquid hydrocarbon desulfurization reactor, reaction system and method to solve the technical problem of insufficient contact between liquid hydrocarbon and absorbent.

[0005] To solve the above technical problems, the present application adopts the following specific scheme: a double reflux jet enhanced premixed liquid hydrocarbon desulfurization reactor, the desulfurization reactor is provided with a premixing section and a full mixing section which are in communication with each other in the flow channel, the liquid hydrocarbon inlet and the absorbent inlet of the desulfurization reactor are located at the starting end of the premixing section, and the mixed liquid outlet of the desulfurization reactor is arranged at the end of the full mixing section; the premixing section is provided with a double-layer premixing sleeve composed of an inner sleeve and an outer sleeve, and the double-layer premixing sleeve is coaxially distributed with the shell of the desulfurization reactor; the outlet of the inner sleeve is arranged in a Venturi type necking, and a plurality of first reflux holes are further arranged on the cylinder wall of the inner sleeve, which can allow the premixed liquid between the inner sleeve and the outer sleeve to reflux to the inner sleeve; the outlet of the outer sleeve is a flared trumpet shape, and the second reflux hole is formed between the flared trumpet shape and the shell of the desulfurization reactor, the starting end of the full mixing section is provided with a microporous dispersion structure, a part of the premixed liquid flowing out of the premixing section enters the full mixing section for dispersion and mixing again, and the other part of the premixed liquid is blocked by the microporous dispersion structure and then refluxes to the premixing flow section through the second reflux hole.

[0006] As a further optimization of the above technical solution, the inlet of the inner sleeve is a circular port with a throttling hole.

[0007] As a further optimization of the above technical solution, the absorbent inlet is connected with an absorbent nozzle arranged in the inner sleeve through a pipeline, and the jet direction of the absorbent nozzle is towards the outlet of the inner sleeve.

[0008] As a further optimization of the above technical solution, the first reflux hole is arranged around the absorbent nozzle.

[0009] As a further optimization of the above technical solution, the microporous dispersion structure is a porous medium and / or a Johnson net, and the porous medium is one or more of a Pall ring, a stepped ring, a matrix saddle or a metal ring matrix saddle.

[0010] As a further optimization of the above technical solution, the full mixing section includes a plurality of dispersion and mixing units, and each dispersion and mixing unit is composed of a dispersion section and a mixing section.

[0011] As a further optimization of the above technical solution, the full mixing section includes a primary dispersion mixing unit and a re-dispersion mixing unit, the primary dispersion mixing unit includes a primary dispersion section and a primary mixing section, and the microporous dispersion structure is arranged in the primary dispersion section; the re-dispersion mixing unit includes a re-dispersion section and a re-mixing section, and the re-dispersion section is filled with a cross-mixing body, the cross-mixing body includes a plurality of first connecting nets and a plurality of second connecting nets arranged vertically and crossly, and the plurality of first connecting nets are arranged in parallel and spaced apart, and the plurality of second connecting nets are arranged in parallel and spaced apart.

[0012] As a further optimization of the above technical solution, the first connecting net includes a plurality of first connecting plates arranged at intervals, and the plurality of first connecting plates are connected by first connecting elements; and the second connecting net includes a plurality of second connecting plates arranged at intervals, and the plurality of second connecting plates are connected by second connecting elements.

[0013] As a further optimization of the above technical solution, the primary dispersion section, the re-dispersion section, the primary mixing section and the re-mixing section are all variable-diameter structures, the primary dispersion section and the re-dispersion section are both convergent flow passages, and the primary mixing section and the re-mixing section are both divergent flow passages.

[0014] As a further optimization of the above technical solution, the ratio of the small diameter to the large diameter in the variable-diameter structure is not less than 0.7.

[0015] As a further optimization of the above technical solution, the acute angle formed by the conical generatrix of the variable-diameter structure and the horizontal line is α, and 45°≤α≤75°.

[0016] A double reflux jet enhanced premixed liquid hydrocarbon desulfurization reaction system includes a preliminary desulfurization unit and a deep desulfurization unit connected in sequence, and the preliminary desulfurization unit and the deep desulfurization unit each include a separator and the above-mentioned desulfurization reactor, the mixed liquid outlet of the desulfurization reactor is connected with the separator of the same desulfurization unit, and the separator of the preliminary desulfurization unit is connected with the desulfurization reactor of the deep desulfurization unit.

[0017] As a further optimization of the above technical solution, the desulfurization reactors of the preliminary desulfurization unit and the deep desulfurization unit are vertically arranged, and in the desulfurization reactors of the preliminary desulfurization unit and the deep desulfurization unit, the premixing section is located below the full mixing section.

[0018] As a further optimization of the above technical solution, the desulfurization reactors of the preliminary desulfurization unit and the deep desulfurization unit are vertically arranged, and in the desulfurization reactors of the preliminary desulfurization unit and the deep desulfurization unit, the premixing section is located below the full mixing section.

[0019] The application discloses a double reflux jetting reinforced premixing type liquid hydrocarbon desulfurization reaction method.

[0020] Compared with the prior art, the application has the following beneficial effects: the double reflux jetting reinforced premixing type liquid hydrocarbon desulfurization reaction system provided by the application sets a double-layer premixing sleeve in the desulfurization reactor from the perspective of strengthening the mixture and mass transfer, and the double-layer premixing sleeve plays a role in premixing the liquid hydrocarbon and the absorbent; through the double reflux of the liquid hydrocarbon and the absorbent, the contact time of the liquid hydrocarbon and the absorbent is prolonged, the turbulence degree of the premixing section is strengthened, and the mass transfer efficiency is improved.

[0021] The double reflux jetting reinforced premixing type liquid hydrocarbon desulfurization reaction system provided by the application sets an initial dispersion section, an initial mixing section, a secondary dispersion section and a secondary mixing section in the desulfurization reactor, so that the mixture flow is repeatedly dispersed and mixed, the turbulence degree of the mixture flow is improved, the contact area of the liquid hydrocarbon and the absorbent is increased, the mass transfer process is strengthened, the reaction degree is deepened, the desulfurization efficiency and the utilization rate of the absorbent are improved, the loss of the absorbent is reduced, and obvious economic benefits are achieved.

[0022] In the double reflux jetting reinforced premixing type liquid hydrocarbon desulfurization reaction system provided by the application, a special cross mixing body is arranged in the secondary dispersion section of the desulfurization reactor, the contact area of the absorbent and the liquid hydrocarbon is increased, the liquid hydrocarbon and the absorbent can be fully mixed in the reactor, and the mass transfer process is fully strengthened. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the example 1;

[0024] Figure 2 It is a structural schematic view of the example 2;

[0025] Figure 3 It is a structural schematic view of the example 3;

[0026] Figure 4 It is a structural schematic view of the cross mixing body;

[0027] Reference numerals: 1. Preliminary desulfurization reactor; 2. Throttling orifice; 3. Double-layer premixing sleeve; 4. Absorbent nozzle; 5. First reflux orifice; 6. Second reflux orifice; 7. Initial dispersion section; 8. Initial mixing section; 9. Cross-mixing body; 91. First connecting mesh; 911. First connecting plate; 912. First connecting element; 92. Second connecting mesh; 921. Second connecting plate; 922. Second connecting element; 10. Redispersion section; 11. Remixing section; 12. Preliminary separator; 13. Wire mesh; 14. Deep desulfurization reactor; 15. Deep separator. Detailed Implementation

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Parts not described or disclosed in detail in the following embodiments of the present invention should be understood as prior art known or should be known by those skilled in the art.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment is a double-reflux jet-enhanced premixed liquid hydrocarbon desulfurization reactor. The flow channel of the desulfurization reactor is provided with interconnected premixing section and fully mixing section from bottom to top. The liquid hydrocarbon inlet and absorbent inlet of the desulfurization reactor are both located at the beginning of the premixing section, that is, the lower end of the premixing section. The mixed liquid outlet of the desulfurization reactor is located at the end of the fully mixing section, that is, the upper end of the fully mixing section.

[0031] The premixing section is equipped with a double-layer premixing sleeve 3 consisting of an inner sleeve and an outer sleeve, and the double-layer premixing sleeve 3 is coaxially distributed with the shell of the desulfurization reactor. The double-layer premixing sleeve 3 is fixed in the premixing section by conventional technology in the field, and can be fixed to the inner wall of the shell of the desulfurization reactor (not shown in the figure) by connecting frame, connecting rod, etc.

[0032] The outlet of the inner sleeve is located at its upper end and is a Venturi-type constriction. The inner sleeve wall also has multiple first reflux holes 5, which allow the premixed liquid between the inner and outer sleeves to flow back into the inner sleeve. The first reflux holes 5 can be circular, triangular, or square. The inlet end of the inner sleeve is a circular opening with a throttling orifice 2.

[0033] The outlet of the outer sleeve is a funnel-shaped flare. A second reflux hole 6 is formed between the funnel-shaped flare and the shell of the desulfurization reactor. The starting end of the fully mixed section is located at its lower end. A microporous dispersion structure is provided at the starting end of the fully mixed section. A portion of the premixed liquid flowing out of the premixed section enters the fully mixed section for further dispersion and mixing. Another portion of the premixed liquid is blocked by the microporous dispersion structure and then flows back to the premixed section through the second reflux hole 6.

[0034] The pre-mixed liquid between the inner sleeve and the outer sleeve is backflowed into the inner sleeve through the first backflow hole 5, and the pre-mixed liquid blocked by the microporous dispersion structure is backflowed into the pre-mixing section through the second backflow hole 6. The double backflow of the mixed liquid in the pre-mixing section can enhance the turbulence degree of the mixture flow and strengthen the mass transfer process.

[0035] The absorbent inlet is connected to the absorbent nozzle 4 arranged in the inner sleeve through a pipeline, and the spraying direction of the absorbent nozzle 4 is towards the outlet of the inner sleeve. The first backflow hole 5 is arranged around the absorbent nozzle 4. The absorbent liquid sprayed by the absorbent nozzle 4 further increases the flow rate of the liquid in the inner sleeve and generates negative pressure, so that the mixed liquid is backflowed into the inner sleeve through the first backflow hole 5, the speed of the mixed liquid backflowing from the outer sleeve into the inner sleeve is increased, and the turbulence degree of the center area of the inner sleeve is further enhanced.

[0036] The microporous dispersion structure is a kind of porous medium or Johnson net, which can disperse the liquid hydrocarbon and the absorbent flowing in parallel from the pre-mixing section into small droplets; wherein the porous medium is one or more of the following: a Bauer ring, a stepped ring, a square saddle or a metal ring saddle.

[0037] The fully mixed section includes a plurality of dispersion mixing units, and each dispersion mixing unit is composed of a dispersion section and a mixing section. The specific number of dispersion mixing units in the fully mixed section is set according to the requirement of the desulfurization degree of the liquid hydrocarbon.

[0038] In this embodiment, the fully mixed section includes one primary dispersion mixing unit and one secondary dispersion mixing unit. The primary dispersion mixing unit includes a primary dispersion section 7 and a primary mixing section 8. The primary dispersion section 7 is a variable-diameter structure with a converging flow channel, and the diameter of the converging flow channel gradually shrinks from bottom to top. The microporous dispersion structure is arranged in the primary dispersion section 7, which can disperse the liquid hydrocarbon and the absorbent flowing in parallel from the pre-mixing section into small droplets. The primary mixing section 8 is an expanded flow channel, and the diameter of the expanded flow channel gradually increases from bottom to top. The primary mixing section 8 can slow down the flow rate of the mixture flow, so that the mixture flow is preliminarily mixed, and the initial conditions are provided for the secondary dispersion section 10 of the secondary dispersion mixing unit.

[0039] The secondary dispersion mixing unit includes a secondary dispersion section 10 and a secondary mixing section 11. The secondary dispersion section 10 and the secondary mixing section 11 are also variable-diameter structures. The secondary dispersion section 10 is a converging flow channel, and the inside of the secondary dispersion section 10 is filled with a cross-mixing body 9. The material of the cross-mixing body 9 is stainless steel, and preferably one or both of 304L and 316L. The cross-mixing body 9 can accelerate the mixture flow and forcibly disperse the mixture flow, so that the small droplets of the liquid hydrocarbon are broken into micro-droplets and dispersed in the absorbent. The secondary mixing section 11 is an expanded flow channel, which can slow down the flow rate of the mixture flow, prolong the residence time of the mixture flow in the flow channel of the desulfurization reactor, make the mixing of the liquid hydrocarbon and the absorbent more sufficient, and make the reaction more thorough, thereby reducing the sulfur content of the desulfurized liquid hydrocarbon.

[0040] As shown in Figure 4 The cross-mixer 9 comprises a plurality of first connecting nets 91 and a plurality of second connecting nets 92 arranged vertically and crossly, the plurality of first connecting nets 91 are arranged parallelly and spacedly, and the plurality of second connecting nets 92 are arranged parallelly and spacedly. In the embodiment, the interval of the plurality of first connecting nets 91 is 0.5-1mm, and the interval of the plurality of second connecting nets 92 is 0.5-1mm. It can be understood that the interval between the first connecting net 91 and the second connecting net 92 can be set and selected according to actual use requirements.

[0041] The first connecting net 91 comprises a plurality of first connecting plates 911 arranged spacedly, and the plurality of first connecting plates 911 are connected through first connecting elements 912. The second connecting net 92 comprises a plurality of second connecting plates 921 arranged spacedly, and the plurality of second connecting plates 921 are connected through second connecting elements 922. The first connecting element 912 and the second connecting element 922 are both cylindrical, and the length is 50-100μm. It can be understood that the specification of the first connecting element 912 and the second connecting element 922 can be set and selected according to actual use requirements.

[0042] The length of the first connecting plate 911 and the second connecting plate 921 is 0.5-2m. It can be understood that the length of the first connecting plate 911 and the second connecting plate 921 can be set and selected according to actual use requirements.

[0043] Through the simple change of the structure in the desulfurization reactor, the mixing and mass transfer of the mixture flow are more sufficient, and the desulfurization effect is effectively improved. It can be understood that the specific specification in the above variable-diameter structure can be flexibly selected according to actual needs, but in order to ensure the stability and installation firmness of the variable-diameter structure, the ratio of the small diameter to the large diameter in the variable-diameter structure (including the primary dispersion section 7, the primary mixing section 8, the secondary dispersion section 10, and the secondary mixing section 11) is usually not less than 0.7, and the angle between the conical generatrix at the variable-diameter position and the horizontal line (i.e. the small inner angle in the variable-diameter structure) is α, 45°≤α≤75°. At the same time, it can be understood that the variable-diameter structure can contain equal-diameter sections before and after the variable-diameter, or can not be provided with equal-diameter sections, which is flexibly selected and set by the person skilled in the art according to needs.

[0044] In use, the desulfurization reactor of the embodiment receives liquid hydrocarbons from light hydrocarbon recovery at the bottom of the desulfurization reactor and sends them to the double-layer premixing sleeve 3. A portion of the liquid hydrocarbons flows upward after being accelerated by the liquid hydrocarbon throttling hole 2 at the center of the inner sleeve, and another portion of the liquid hydrocarbons flows upward through the annular gap between the inner sleeve and the outer sleeve. Since the flow rate in the inner sleeve is high, a portion of the liquid hydrocarbons in the annular gap enters the center of the inner sleeve through the first backflow hole 5, thereby strengthening the turbulence in the center region. When the liquid hydrocarbons flow upward to the upper portion of the double-layer premixing sleeve 3, a portion of the liquid hydrocarbons flows downward to the bottom of the desulfurization reactor through the second backflow hole 6 between the double-layer premixing sleeve 3 and the shell of the desulfurization reactor due to the blocking of the primary dispersion section 7, thereby being fully mixed. The absorbent from the solvent regenerating device enters the nozzle 4 at the lower side of the desulfurization reactor through a pipeline and diffuses into the double-layer premixing sleeve 3 in the form of small droplets after passing through the nozzle 4 to be premixed with the liquid hydrocarbons in the double-layer premixing sleeve 3. Then, the liquid hydrocarbons flow upward to the primary dispersion section 7. The liquid hydrocarbons are dispersed into small droplets in the microporous dispersion structure and then accelerated through the convergent flow passage to enter the primary mixing section 8. Since the flow passage is expanded, the flow rate of the mixture stream is reduced. At this time, the small droplets of the liquid hydrocarbons are in substantial contact with the absorbent to perform primary desulfurization. Then, the substantially mixed and uniform mixture stream continues to flow upward to the secondary dispersion section 10. The mixture stream is accelerated again by passing through the convergent flow passage to violently impact the cross-mixing body 9. The liquid hydrocarbons carried by the absorbent are forced to be dispersed into micro-droplets. Then, the accelerated mixture stream enters the secondary mixing section 11 after being reduced in speed again by being expanded in diameter. At this time, the micro-droplets of the liquid hydrocarbons are in full contact with the absorbent to perform deep desulfurization. Finally, the mixed fluid flows out of the top of the desulfurization reactor to enter the subsequent link.

[0045] It should be noted that, in use, the desulfurization reactor of the embodiment uses a multifunctional enhancer as the absorbent. The multifunctional enhancer can eliminate foam and is also conducive to the formation of small droplets.

[0046] Embodiment 2

[0047] As shown in Figure 2 , the embodiment is a double-backflow jet-enhanced premixing type liquid hydrocarbon desulfurization reaction system, which includes a primary desulfurization unit and a deep desulfurization unit connected in sequence. Both the primary desulfurization unit and the deep desulfurization unit include a separator and the above-mentioned desulfurization reactor. The mixed liquid outlet of the desulfurization reactor is connected to the separator of the same desulfurization unit. The separator of the primary desulfurization unit is connected to the desulfurization reactor of the deep desulfurization unit.

[0048] In the embodiment, the number of the primary desulfurization unit and the deep desulfurization unit is one set. In actual application, if the emission requirement is higher, the number of the connection between the primary desulfurization unit and the deep desulfurization unit can be increased.

[0049] The preliminary desulfurization unit comprises a preliminary desulfurization reactor 1 and a preliminary separator 12, and the deep desulfurization unit comprises a deep desulfurization reactor 14 and a deep separator 15. The preliminary desulfurization reactor 1 and the deep desulfurization reactor 14 are both vertically arranged, and the premixing sections of the preliminary desulfurization reactor 1 and the deep desulfurization reactor 14 are both located below the fully mixing sections.

[0050] The mixed liquid outlet of the preliminary desulfurization reactor 1 is connected to the middle part of the preliminary separator 12 through a conveying pipeline. The preliminary separator 12 is used for separating the liquid hydrocarbon after desulfurization of hydrogen sulfide and the rich amine liquid adsorbing hydrogen sulfide in the mixed liquid. The upper part and the lower part of the preliminary separator 12 are both provided with metal wire meshes 13. The metal wire meshes 13 are mainly used for improving the separation efficiency. In the present application, the specific structure and material of the preliminary separator 12 and the metal wire meshes 13 are not specifically described and limited, as long as they can separate the desulfurized liquid hydrocarbon and the used absorbent. The absorbent separated by the preliminary separator 12 and the deep separator 15 enters a subsequent solvent regeneration device.

[0051] In the deep desulfurization reactor 14 and the deep separator 15 of the present embodiment, the cross mixing bodies 9 are all as shown in Figure 4 The interval of the plurality of first connecting elements 912 is 1 mm, and the interval of the plurality of second connecting elements 922 is 1 mm. The first connecting elements 912 and the second connecting elements 922 are both cylindrical and have a length of 100 μm. The first connecting plates 911 and the second connecting plates 921 have a length of 2 m. The material of the cross mixing rod is 316L.

[0052] The initial dispersion section 7 has a variable diameter structure with a narrow upper part and a wide lower part. The initial mixing section 8 has a variable diameter structure with a wide upper part and a narrow lower part. The re-dispersion section 10 has a variable diameter structure with a narrow upper part and a wide lower part. The re-mixing section 11 has a variable diameter structure with a wide upper part and a narrow lower part. The ratio of the small diameter to the large diameter of the above variable diameter structures is all 0.75, and the included angle α between the conical generatrix at the variable diameter part and the horizontal line is 60°.

[0053] The microporous dispersion structure filled in the initial dispersion section 7 is a Powell ring. The upper part and the lower part of the preliminary separator 12 are both provided with metal wire meshes 13.

[0054] The liquid hydrocarbon after desulfurization of hydrogen sulfide separated from the preliminary separator 12 is conveyed to the deep desulfurization reactor 14 through a pipeline, and further desulfurization reaction is carried out in the deep desulfurization reactor 14 and then flows into the deep separator 15 for separation. The preliminary desulfurization reactor 1 and the deep desulfurization reactor 14 have the same structure, and the preliminary separator 12 and the deep separator 15 also have the same structure. Therefore, the specific structure of the deep desulfurization unit will not be described here.

[0055] Example 3

[0056] The embodiment has the same main structure as that of the embodiment 2, and the difference is that in the embodiment 3, the premixing section of the deep desulfurization reactor 14 is located above the full mixing section thereof, the liquid hydrocarbon inlet and the absorbent inlet of the deep desulfurization reactor 14 are both located at the upper end thereof, and the mixed liquid outlet is located at the lower end thereof. Through the connection mode, the desulfurization reactor of the present application can be applied to the down-flow desulfurization reaction, and the application range is wide.

[0057] Embodiment 4

[0058] A double reflux jet enhanced premixing type liquid hydrocarbon desulfurization reaction method, which adopts the double reflux jet enhanced premixing type liquid hydrocarbon desulfurization reaction system of the embodiment 2 or 3, adopts the alcohol amine method to remove hydrogen sulfide in the preliminary desulfurization unit, and adopts the wet method alkali washing to remove mercaptan in the deep desulfurization unit.

[0059] The liquid hydrocarbon and the absorbent are first introduced into the preliminary desulfurization reactor 1, the absorbent is the amine liquid, the mixed liquid after the preliminary desulfurization reaction flows into the preliminary separator 12 for separation, the desulfurized liquid hydrocarbon after the separation flows into the deep desulfurization reactor 14, the absorbent is introduced into the deep desulfurization reactor 14, the absorbent is the alkali liquid, the mixed liquid after the deep desulfurization reaction flows into the deep separator 15 for separation, and the one-time desulfurization operation is completed.

[0060] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dual reflux jet enhanced premixed liquid hydrocarbon desulfurization reactor characterized by, The flow channel of the desulfurization reactor is provided with a premixing section and a full mixing section in communication with each other, the liquid hydrocarbon inlet and the absorbent inlet of the desulfurization reactor are located at the starting end of the premixing section, and the mixed liquid outlet of the desulfurization reactor is arranged at the end of the full mixing section; The premixing section is provided with a double-layer premixing sleeve (3) composed of an inner sleeve and an outer sleeve, and the double-layer premixing sleeve (3) is coaxially distributed with the shell of the desulfurization reactor; The outlet of the inner sleeve is arranged in a Venturi type necking, and a plurality of first backflow holes (5) are further arranged on the cylinder wall of the inner sleeve, which can allow the premixed liquid between the inner sleeve and the outer sleeve to backflow to the inner sleeve. The outlet of the outer sleeve is a horn-shaped flared opening, and the horn-shaped flared opening and the shell of the desulfurization reactor form a second backflow hole (6), the starting end of the full mixing section is provided with a microporous dispersion structure, a part of the premixed liquid flowing out of the premixing section enters the full mixing section for dispersion and mixing again, and another part of the premixed liquid is blocked by the microporous dispersion structure and then backflows to the premixing section through the second backflow hole (6); The full mixing section includes a plurality of dispersion and mixing units, and each dispersion and mixing unit is composed of a dispersion section and a mixing section. The full mixing section includes a primary dispersion and mixing unit and a secondary dispersion and mixing unit, the primary dispersion and mixing unit includes a primary dispersion section (7) and a primary mixing section (8), and the microporous dispersion structure is arranged in the primary dispersion section (7); the secondary dispersion and mixing unit includes a secondary dispersion section (10) and a secondary mixing section (11), and the secondary dispersion section (10) is filled with a cross-mixing body (9), the cross-mixing body (9) includes a plurality of first connecting nets (91) and a plurality of second connecting nets (92) arranged vertically and crossly, the plurality of first connecting nets (91) are arranged in parallel and spaced apart, and the plurality of second connecting nets (92) are arranged in parallel and spaced apart.

2. A dual reflux jet enhanced premixed liquid hydrocarbon desulfurization reactor according to claim 1, wherein, The inlet of the inner sleeve is a circular port with a throttle hole (2).

3. A dual reflux jet enhanced premixed liquid hydrocarbon desulfurization reactor according to claim 1, wherein, The absorbent inlet is connected with an absorbent nozzle (4) arranged in the inner sleeve through a pipeline, and the spraying direction of the absorbent nozzle (4) is towards the outlet of the inner sleeve.

4. A dual reflux jet enhanced premix liquid hydrocarbon desulfurization reactor according to claim 3, wherein, The first backflow hole (5) is arranged around the absorbent nozzle (4).

5. The dual reflux jet enhanced premixed liquid hydrocarbon desulfurization reactor according to claim 1, wherein, The microporous dispersion structure is a porous medium and / or a Johnson net, and the porous medium is one or more of a Bauer ring, a stepped ring, and a rectangular saddle.

6. A dual reflux jet enhanced premix liquid hydrocarbon desulfurization reactor according to claim 1, wherein, The first connecting net (91) includes a plurality of first connecting plates (911) arranged at intervals, and the plurality of first connecting plates (911) are connected by first connecting elements (912); the second connecting net (92) includes a plurality of second connecting plates (921) arranged at intervals, and the plurality of second connecting plates (921) are connected by second connecting elements (922).

7. The dual reflux jet enhanced premixed liquid hydrocarbon desulfurization reactor according to claim 1, wherein, The primary dispersion section (7), the secondary dispersion section (10), the primary mixing section (8), and the secondary mixing section (11) are all variable-diameter structures, the primary dispersion section (7) and the secondary dispersion section (10) are convergent flow channels, and the primary mixing section (8) and the secondary mixing section (11) are divergent flow channels.

8. A dual reflux jet enhanced premix liquid hydrocarbon desulfurization reactor according to claim 7, wherein, The ratio of the small diameter to the large diameter in the variable-diameter structure is not less than 0.

7.

9. A dual reflux jet enhanced premix liquid hydrocarbon desulfurization reactor according to claim 8, wherein, An acute angle formed by the conical generatrix of the variable-diameter structure and the horizontal line is α, and 45°≤α≤75°.

10. A dual reflux jet enhanced premixed liquid hydrocarbon desulfurization reaction system characterized by, The desulfurization system comprises a preliminary desulfurization unit and a deep desulfurization unit connected in sequence, and each of the preliminary desulfurization unit and the deep desulfurization unit comprises a separator and a desulfurization reactor as claimed in any one of claims 1 to 9, the mixed liquid outlet of the desulfurization reactor is connected with the separator of the same desulfurization unit, and the separator of the preliminary desulfurization unit is connected with the desulfurization reactor of the deep desulfurization unit.

11. A dual reflux jet enhanced premixed liquid hydrocarbon desulfurization reaction system according to claim 10, wherein, The desulfurization reactors of the preliminary desulfurization unit and the deep desulfurization unit are vertically arranged, and the premixing section is arranged below the full-mixing section in the desulfurization reactors of the preliminary desulfurization unit and the deep desulfurization unit.

12. A dual reflux jet enhanced premixed liquid hydrocarbon desulfurization reaction system according to claim 10, wherein, The desulfurization reactors of the preliminary desulfurization unit and the deep desulfurization unit are vertically arranged, and the premixing section is arranged below the full-mixing section in the desulfurization reactor of the preliminary desulfurization unit, and the premixing section is arranged above the full-mixing section in the desulfurization reactor of the deep desulfurization unit.

13. A dual reflux jet enhanced premixed liquid hydrocarbon desulfurization reaction method characterized by, The method adopts the double-reflux jet enhanced premixing type liquid hydrocarbon desulfurization reaction system as claimed in claim 11 or 12, first passes liquid hydrocarbon and amine liquid into the desulfurization reactor of the preliminary desulfurization unit to perform preliminary desulfurization reaction, flows the reacted mixed liquid into the separator of the preliminary desulfurization unit to perform separation, flows the separated desulfurized liquid hydrocarbon into the desulfurization reactor of the deep desulfurization unit, passes alkali liquid into the desulfurization reactor of the deep desulfurization unit, flows the reacted mixed liquid into the separator of the deep desulfurization unit to perform separation, and completes one desulfurization operation.

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