Oil removal type double-inner-cone tandem oil-alcohol separation device and use method thereof

Abstract

The invention discloses an oil removal type double-inner-cone tandem oil-alcohol separation device and a use method thereof, and belongs to the technical field of separation devices. The oil-alcohol separation device comprises an inlet buffer cavity, a flow guide cavity, a separation cavity, an outlet buffer cavity and a collection cavity, the separation cavity is internally provided with tandem type double inner cones, and the tandem type double inner cones are internally provided with diesel oil flow channels; a diesel flow guide groove is formed in the outlet buffer cavity, the cone bottom of the tandem type double inner cone is connected with the groove bottom of the diesel flow guide groove, a double-inner-cone diesel side outlet is formed in the side face of the end, close to the diesel flow guide groove, of the tandem type double inner cone, a crude glycerin outlet pipeline and a diesel outlet pipeline are arranged in the collecting cavity, and the diesel outlet pipeline is communicated with the diesel flow channel. The oil-alcohol separation device provided by the invention can realize the effects of embedded installation in a conveying pipeline and separation while conveying, and the device is simple and compact in overall structure, free of moving parts and capable of realizing long-period operation.

Description

Technical Field

[0001] The invention relates to the technical field of separation devices, and in particular to an oil removal type double inner cone series oil-alcohol separation device and a use method thereof. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance the understanding of the overall background of the invention and should not be necessarily regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Biodiesel is recognized as a high-quality liquid alternative fuel because of its renewable, low-carbon and clean nature. The transesterification method is currently the most widely used and mature method for preparing biodiesel in the industry. During the reaction, the raw oil and short-chain alcohol (methanol, ethanol, etc.) are transferred to produce fatty acid alkyl esters through acyl transfer under the action of a catalyst. In addition to the target product biodiesel, the reaction product also includes crude glycerol (glycerol). Crude glycerol is a high-value-added chemical that can be converted into propylene glycol, diglyceride, acetol and a variety of other products through thermochemical conversion.

[0004] At present, the separation of biodiesel and crude glycerol in the biodiesel preparation process is mainly carried out by the sedimentation separation method. The separation device of this method occupies a large area and takes a long time. In the liquid-liquid heterogeneous separation technology and equipment, the hydrocyclone has become a widely used separation equipment due to its simple and compact structure and high processing efficiency. Traditional hydrocyclones are divided into two types: tangential and axial flow inlets; the axial flow inlet is more compact than the tangential inlet, and the inlet can be designed in the axial direction, which is conducive to realizing the separation process without affecting pipeline transportation; but the opposite settings of the overflow and underflow outlets of the traditional axial flow hydrocyclone make it difficult to achieve the effect of immediate delivery and separation. Therefore, how to optimize the design of the axial flow hydrocyclone without affecting the separation efficiency has become a key issue in achieving efficient separation of oleyl alcohol in the transportation process of the oleyl alcohol mixture. Summary of the invention

[0005] In view of this, the present invention provides an oil-removing double inner cone series oil-alcohol separation device and a method of using the same. The oil-alcohol separation device provided by the present invention can be embedded in a conveying pipeline, can separate oil and alcohol during product transportation (i.e., transport and separate), and does not affect the transportation direction of the pipeline. The overall structure of the device is simple and compact.

[0006] In the first aspect, the present invention provides an oil-removing double inner cone series oil-alcohol separation device, comprising an inlet buffer chamber, a guide chamber, a separation chamber, an outlet buffer chamber and a collection chamber arranged in sequence along the liquid conveying direction; a guide structure is provided in the guide chamber;

[0007] A series of double inner cones are arranged in the separation chamber, and a diesel flow channel is arranged inside the series of double inner cones; the radial diameter of the series of double inner cones increases first and then decreases along the liquid conveying direction; the radial diameter of the series of double inner cones is smaller than the inner diameter of the separation chamber;

[0008] A diesel guide groove is arranged in the outlet buffer cavity, the cone bottom of the series-type double inner cone is connected to the groove bottom of the diesel guide groove, and the cone bottom diameter of the series-type double inner cone is smaller than the groove bottom diameter of the diesel guide groove; a double inner cone diesel side outlet is arranged on the side surface of one end of the series-type double inner cone close to the diesel guide groove; the double inner cone diesel side outlet is communicated with the diesel flow channel;

[0009] The collecting chamber comprises a crude glycerin outlet pipeline and a diesel outlet pipeline, and the diesel outlet pipeline is communicated with the diesel flow channel.

[0010] Preferably, the guide chamber, separation chamber and outlet buffer chamber are cylindrical shell structures with the same diameter; the inlet buffer chamber, guide chamber, separation chamber, outlet buffer chamber and collection chamber are connected by flanges.

[0011] Preferably, the guide cavity includes a guide weir, a guide vane and a guide cone which are sequentially arranged along the liquid conveying direction.

[0012] Furthermore, the guide weir is a semi-ellipsoidal structure; the guide blades form a spiral flow channel, and the outer diameter of the spiral flow channel is smaller than the inner diameter of the guide cavity.

[0013] Furthermore, the tip of the guide cone faces the diesel flow channel, and the axis of the guide cone and the axis of the diesel flow channel are located on the same straight line; the guide cone and the series-connected double inner cone are separated by a set distance.

[0014] Preferably, the series-connected double inner cones are threadedly connected to the diesel outlet pipe via a connecting component; the diesel guide groove has an opening facing the series-connected double inner cones, and its diameter is smaller than the inner diameter of the outlet buffer chamber.

[0015] Preferably, the diesel outlet pipe comprises a parallel section, a bent section and a vertical section in sequence along the liquid conveying direction, the axis of the parallel section is on the same straight line as the axis of the diesel flow channel; the axis of the vertical section is perpendicular to the axis of the diesel flow channel.

[0016] Preferably, the collecting chamber includes an annular isolation plate, the diesel outlet pipe passes through the interior of the annular isolation plate, and the plane where the annular isolation plate is located is perpendicular to the axis of the outlet buffer chamber; a plurality of crude glycerin outlet pipe inlet holes are arranged on the annular isolation plate, and the plurality of crude glycerin outlet pipe inlet holes are connected to a plurality of crude glycerin outlet pipes.

[0017] Furthermore, the multiple crude glycerol outlet pipes are spiral structures, and one end of the multiple crude glycerol outlet pipes away from the annular isolation plate is connected to the crude glycerol outlet buffer chamber, and one end of the crude glycerol outlet buffer chamber away from the multiple crude glycerol outlet pipes is connected to the crude glycerol terminal outlet pipe.

[0018] In a second aspect, the present invention provides a method for using the above-mentioned oil removal type double inner cone series oil-alcohol separation device, comprising:

[0019] After the ester exchange reaction is completed, the biodiesel and glycerol mixture enters the inlet buffer chamber for buffering and then flows into the diversion chamber, where it is diverted under the action of the diversion structure; the diverted liquid enters the separation chamber, where the biodiesel and glycerol are separated by the series-connected double inner cones arranged in the separation chamber; a portion of the separated biodiesel flows into the diesel flow channel from the upper end of the series-connected double inner cones, and a portion flows into the diesel flow channel through the double inner cone diesel side outlet, and is finally discharged through the diesel outlet pipe; the separated crude glycerol is discharged through the crude glycerol outlet pipe.

[0020] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0021] (1) The deoiling double inner cone serial oil-alcohol separation device provided by the present invention eliminates the design of the overflow and underflow outlets facing each other in the traditional axial flow hydrocyclone, and designs the traditional overflow pipe for discharging crude oil, i.e., the diesel flow channel, inside the serial double inner cone, so as to achieve the effect of immediate delivery and separation, that is, the separation of oil and alcohol (biodiesel and glycerol) can be achieved directly during the pipeline transportation process after the oil alcoholysis reaction is completed. The separation device of the present invention can be embedded in the transportation pipeline, and the separation device does not affect the transportation direction of the pipeline. The overall structure of the device is simple and compact, without moving parts, and can achieve long-term operation.

[0022] (2) The oil-removing double inner cone series oil-alcohol separation device provided by the present invention has a modular structure, and key components are designed to be detachable, which can reduce the cost of operation and maintenance while realizing the applicability of the separation device in multiple occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation of the present invention. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 Schematic diagram of the overall structure of the oil removal type double inner cone series oil-alcohol separation device according to Example 1 of the present invention;

[0025] Figure 2is a schematic structural diagram of the inlet buffer chamber of Example 1 of the present invention;

[0026] Figure 3 is a schematic diagram of the front structure of the flow guide cavity according to Example 1 of the present invention;

[0027] Figure 4 is a top view of the flow guide cavity of Example 1 of the present invention;

[0028] Figure 5 It is a structural schematic diagram of a series-type double inner cone, a connecting component and a diesel guide groove of Example 1 of the present invention;

[0029] Figure 6 Schematic diagram of the position of the double inner cone diesel side outlet of Example 1 of the present invention;

[0030] Figure 7 is a schematic diagram of the internal thread of the connecting component of Example 1 of the present invention;

[0031] Figure 8 Schematic diagram of the position of the annular isolation plate and the inlet hole of the crude glycerol outlet pipe in the collecting chamber of Example 1 of the present invention;

[0032] Fig. 9 is a schematic structural diagram of the collection chamber of Example 1 of the present invention;

[0033] In the figure, 1, inlet buffer chamber; 2, guide chamber; 3, separation chamber; 4, series double inner cone; 5, outlet buffer chamber; 6, collecting chamber; 7, first flange; 8, second flange; 9, third flange; 10, fourth flange; 11, internal thread; 12, oil-alcohol mixture inlet; 13, inlet buffer chamber cone section; 14, inlet buffer chamber column section; 15, guide weir; 16, spiral flow channel; 17, guide vane; 18, guide chamber shell; 19, guide cone; 20, upper inner cone; 21, diesel flow channel; 22, lower inner cone; 23, connecting component; 24, diesel guide groove; 25, double inner cone diesel side outlet; 26, diesel outlet; 27, crude glycerin outlet pipe inlet hole; 28, crude glycerin outlet pipe; 29, crude glycerin outlet buffer chamber; 30, crude glycerin terminal outlet pipe; 31, crude glycerin outlet; 32, diesel outlet pipe; 33, annular isolation plate. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] The technical solution of the present invention is further described below in conjunction with specific embodiments and drawings.

[0036] Example 1

[0037] This embodiment provides an oil removal type double inner cone series oil-alcohol separation device, such as Figure 1 As shown, it includes an inlet buffer chamber 1, a guide chamber 2, a separation chamber 3, an outlet buffer chamber 5 and a collection chamber 6 which are sequentially arranged along the liquid conveying direction. The inlet buffer chamber 1, the guide chamber 2, the separation chamber 3, the outlet buffer chamber 5 and the collection chamber 6 are detachably connected by a first flange 7, a second flange 8, a third flange 9 and a fourth flange 10; the guide chamber 2, the separation chamber 3 and the outlet buffer chamber 5 are cylindrical shell structures with the same diameter. The deoiling type double inner cone series oil-alcohol separation device is preferably arranged vertically.

[0038] like Figure 2 As shown, the inlet buffer chamber 1 comprises an oil-alcohol mixture inlet 12, an inlet buffer chamber cone section 13 and an inlet buffer chamber column section 14; the plane where the oil-alcohol mixture inlet 12 is located is perpendicular to the liquid conveying direction.

[0039] like Figure 3 and Figure 4 As shown, the guide cavity 2 is designed with a guide weir 15, a guide blade 17, a guide cavity shell 18 and a guide cone 19. The guide weir 15 is a semi-ellipsoidal structure, with its convex end facing the oil-alcohol mixture inlet 12. The guide weir 15 and the guide cone 19 are connected by a cylindrical section (the cylindrical section is represented by a gray line in the figure and is blocked by the spiral flow channel 16). The maximum radial diameter of the guide weir 15 and the guide cone 19 is the same as the diameter of the cylindrical section. The axes of the guide weir 15, the cylindrical section and the guide cone 19 are located on the same straight line as the axis of the guide cavity 2. The outer side of the cylindrical section is formed by the guide blade 17 to form a spiral flow channel 16, and the outer diameter of the spiral flow channel 16 is smaller than the inner diameter of the guide cavity shell 18. The spiral flow channel 16 mainly plays a guiding role. Under the action of the spiral flow channel 16, the biodiesel with higher density moves toward the axis, and the glycerol with higher density moves radially toward the wall.

[0040] like Figure 1 and Figure 5 As shown, a series of double inner cones 4 are arranged in the separation chamber 3, and a diesel flow channel 21 is arranged inside the series of double inner cones 4. The axis of the diesel flow channel 21, the axis of the series of double inner cones 4 and the axis of the separation chamber 3 are located on the same straight line. The tip of the guide cone 19 faces the diesel flow channel 21, and a small portion of biodiesel in a spatial position close to the axis flows into the diesel flow channel 21 along the guide cone 19 under the action of the guide cone 19.

[0041] The top of the series-connected double inner cone 4 is at a set distance from the drainage cone 19. The radial diameter of the series-connected double inner cone 4 increases first and then decreases along the liquid conveying direction, and is divided into an upper inner cone 20 and a lower inner cone 22. The maximum radial diameter of the series-connected double inner cone 4 is smaller than the inner diameter of the separation chamber 3, so that the crude glycerol flows along the wall. Since the radial diameter of the upper inner cone 20 of the series-connected double inner cone 4 is continuously increased, it can form an inner vortex of biodiesel at the bottom of the upper inner cone 20, and make part of the biodiesel flow into the diesel flow channel 21 along the upper inner cone 20.

[0042] like Figure 5 and Figure 6 As shown, a diesel guide groove 24 is arranged in the outlet buffer chamber 5, and the diameter of the diesel guide groove 24 is smaller than the inner diameter of the outlet buffer chamber 5, so that the crude glycerol can continue to rotate and flow downward along the wall surface. The opening of the diesel guide groove 24 faces the series double inner cone 4. Preferably, a conical section and a cylindrical section are arranged in sequence inside the diesel guide groove 24 along the liquid conveying direction. The conical section can play a certain guiding effect, so that the biodiesel can smoothly enter the diesel guide groove 24, and the cylindrical section plays a role of collection and transition. The cone bottom of the series double inner cone 4 is connected to the groove bottom of the diesel guide groove 24, and the cone bottom diameter of the series double inner cone 4 is smaller than the groove bottom diameter of the diesel guide groove 24. The biodiesel that has not been separated at the upper inner cone 20 enters the diesel guide groove 24 under the drainage effect of the lower inner cone 22. The tandem double inner cone 4 is provided with a double inner cone diesel side outlet 25 on one end side near the diesel guide groove 24. The double inner cone diesel side outlet 25 is communicated with the diesel flow channel 21, so the biodiesel stored in the diesel guide groove 24 continuously enters the diesel flow channel 21. The design of the upper inner cone 20 and the lower inner cone 22 can achieve two-stage separation.

[0043] At least one double inner cone diesel side outlet 25 is provided, and the groove height of the diesel guide groove 24 is greater than the opening size of the double inner cone diesel side outlet 25 to prevent biodiesel from overflowing.

[0044] The series double inner cone 4 is connected to the diesel outlet pipe 32 through a connecting component 23, and an internal thread 11 is provided in the connecting component 23. Figure 7 As shown, the diesel outlet pipe 32 is provided with external threads, such as Figure 8 As shown, the two are connected by threads, and the internal diesel flow channel 21 is connected to the diesel outlet pipe 32. The diesel guide groove 24 is arranged in the connecting component 23.

[0045] like Figure 8 and Fig. 9As shown, the collecting chamber 6 is provided with an annular isolation plate 33, and the plane where the annular isolation plate 33 is located is perpendicular to the axis of the outlet buffer chamber 5. The diesel outlet pipe 32 passes through the annular isolation plate 33. The diesel outlet pipe 32 includes a parallel section, a bending section and a vertical section in the direction of liquid delivery. The axis of the parallel section is located on the same straight line as the axis of the diesel flow channel 21; the axis of the vertical section is perpendicular to the axis of the diesel flow channel 21, which reduces the impact on the pipeline layout of pipeline delivery. The diesel outlet 26 is provided at one end of the vertical section away from the bending section.

[0046] The annular isolation plate 33 is provided with a plurality of crude glycerin outlet pipe inlet holes 27, which are connected to a plurality of crude glycerin outlet pipes 28. The plurality of crude glycerin outlet pipes 28 are spiral structures, and the spiral rotation direction is consistent with the rotation direction of the guide vane 17. The horizontal section and the bent section of the diesel outlet pipe 32 are located in the gap between the plurality of crude glycerin outlet pipes 28, which improves the compactness of the equipment.

[0047] One end of the multiple crude glycerol outlet pipes 28 away from the annular isolation plate 33 is connected to the crude glycerol outlet buffer chamber 29. The crude glycerol outlet buffer chamber 29 provides a certain buffer for the crude glycerol after the swirl flow, thereby improving the flow field stability of the subsequent transportation process. One end of the crude glycerol outlet buffer chamber 29 away from the multiple crude glycerol outlet pipes 28 is connected to the crude glycerol terminal outlet pipe 30, and finally discharged through the crude glycerol outlet 31. The plane where the crude glycerol outlet 31 is located is perpendicular to the liquid transportation direction.

[0048] The oil removal type double inner cone series oil-alcohol separation device provided in this embodiment can be directly embedded in the product conveying pipeline without the need for rearranging the pipeline.

[0049] Example 2

[0050] This embodiment provides a method for using the oil removal type double inner cone series oil-alcohol separation device of embodiment 1, comprising the following steps:

[0051] After the ester exchange reaction is completed, the biodiesel and glycerol mixture enters the inlet buffer chamber 1 from the oil-alcohol mixture inlet 12, flows through the inlet buffer chamber cone section 13 and the inlet buffer chamber column section 14 in sequence and enters the guide chamber 2; under the guidance of the guide weir 15 at the upper part of the guide chamber 2, it flows into the spiral flow channel 16 formed by the guide blades 17, forms a vortex under its action, and then flows into the separation chamber 3. Under the influence of the density difference between oil and alcohol, biodiesel gradually moves toward the axis, while glycerol moves radially toward the wall. A portion of the biodiesel flows into the diesel flow channel 21 along the lower guide cone 19 of the guide chamber 2, and the remaining biodiesel forms an inner vortex at the bottom of the upper inner cone 20 of the series-connected double inner cone 4 during the axial movement, and flows into the diesel flow channel 21 along the upper inner cone 20; the biodiesel that has not been separated at the upper inner cone 20 continues to move axially into the lower section of the separation chamber 3, and the biodiesel that has not been separated rotates along the lower inner cone 22 until it flows into the diesel guide groove 24, and enters the diesel flow channel 21 from the double inner cone diesel side outlet 25, and then flows into the diesel outlet pipe 32, and is discharged from the diesel outlet 26.

[0052] The separated glycerin flows along the wall of the separation chamber 3 into the annular area between the outlet buffer chamber 5 and the connecting component 23, then enters the multiple crude glycerin outlet pipes 28 of the spiral structure through the crude glycerin outlet pipe inlet 27 on the annular isolation plate 33, then enters the crude glycerin outlet buffer chamber 29, and finally flows through the crude glycerin terminal outlet pipe 30 and flows out from the crude glycerin outlet 31.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil removal type double inner cone series oil-alcohol separation device, characterized in that: It includes an inlet buffer chamber, a guide chamber, a separation chamber, an outlet buffer chamber and a collection chamber which are sequentially arranged along the liquid conveying direction; a guide structure is arranged in the guide chamber; A series of double inner cones are arranged in the separation chamber, and a diesel flow channel is arranged inside the series of double inner cones; the radial diameter of the series of double inner cones increases first and then decreases along the liquid conveying direction; the radial diameter of the series of double inner cones is smaller than the inner diameter of the separation chamber; A diesel guide groove is arranged in the outlet buffer cavity, the cone bottom of the series-type double inner cone is connected to the groove bottom of the diesel guide groove, and the cone bottom diameter of the series-type double inner cone is smaller than the groove bottom diameter of the diesel guide groove; a double inner cone diesel side outlet is arranged on the side surface of one end of the series-type double inner cone close to the diesel guide groove; the double inner cone diesel side outlet is communicated with the diesel flow channel; The collecting chamber comprises a crude glycerin outlet pipeline and a diesel outlet pipeline, and the diesel outlet pipeline is communicated with the diesel flow channel.

2. The oil removal type double inner cone series oil-alcohol separation device according to claim 1, characterized in that: The guide chamber, separation chamber and outlet buffer chamber are cylindrical shell structures with the same diameter; the inlet buffer chamber, guide chamber, separation chamber, outlet buffer chamber and collection chamber are connected by flanges.

3. The oil removal type double inner cone series oil-alcohol separation device according to claim 1, characterized in that: The guide cavity includes a guide weir, a guide vane and a guide cone which are sequentially arranged along the liquid conveying direction.

4. The oil removal type double inner cone series oil-alcohol separation device according to claim 3, characterized in that: The guide weir is a semi-ellipsoidal structure; the guide blades form a spiral flow channel, and the outer diameter of the spiral flow channel is smaller than the inner diameter of the guide cavity.

5. The oil removal type double inner cone series oil-alcohol separation device according to claim 3, characterized in that: The tip of the guide cone faces the diesel flow channel, and the axis of the guide cone and the axis of the diesel flow channel are located on the same straight line; the guide cone and the series-connected double inner cone are separated by a set distance.

6. The oil removal type double inner cone series oil-alcohol separation device according to claim 1, characterized in that: The serial double inner cones are threadedly connected to the diesel outlet pipe through a connecting component; the diesel guide groove has an opening facing the serial double inner cones, and its diameter is smaller than the inner diameter of the outlet buffer chamber.

7. The oil removal type double inner cone series oil-alcohol separation device according to claim 1, characterized in that: The diesel outlet pipeline includes a parallel section, a bent section and a vertical section in sequence along the liquid conveying direction. The axis of the parallel section is on the same straight line as the axis of the diesel flow channel; the axis of the vertical section is perpendicular to the axis of the diesel flow channel.

8. The oil removal type double inner cone series oil-alcohol separation device according to claim 1, characterized in that: The collecting chamber includes an annular isolation plate, the diesel outlet pipe passes through the inside of the annular isolation plate, and the plane where the annular isolation plate is located is perpendicular to the axis of the outlet buffer chamber; a plurality of crude glycerin outlet pipe inlet holes are arranged on the annular isolation plate, and the plurality of crude glycerin outlet pipe inlet holes are connected to a plurality of crude glycerin outlet pipes.

9. The oil removal type double inner cone series oil-alcohol separation device according to claim 8, characterized in that: The multiple crude glycerol outlet pipes are spiral structures, and one end of the multiple crude glycerol outlet pipes away from the annular isolation plate is connected to the crude glycerol outlet buffer chamber, and one end of the crude glycerol outlet buffer chamber away from the multiple crude glycerol outlet pipes is connected to the crude glycerol terminal outlet pipe.

10. The method for using the oil removal type double inner cone series oil-alcohol separation device according to any one of claims 1 to 9, characterized in that: include: After the transesterification reaction, the biodiesel and glycerol mixture enters the inlet buffer chamber for buffering and then flows into the diversion chamber, where it is diverted under the action of the diversion structure. The diverted liquid enters the separation chamber, and the biodiesel and glycerin are separated by the series-connected double inner cones arranged in the separation chamber; part of the separated biodiesel flows into the diesel flow channel from the upper end of the series-connected double inner cones, and part flows into the diesel flow channel through the double inner cone diesel side outlet, and is finally discharged through the diesel outlet pipe; the separated crude glycerin is discharged through the crude glycerin outlet pipe.

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