Vacuum steam stripping desolventizing machine

Abstract

The utility model discloses a vacuum stripping desolventizing machine. A desolventizing gas phase outlet and a wet meal inlet are formed in the top of a barrel, a plurality of heating interlayers are arranged in an inner cavity of the barrel, a rotary valve is arranged at each layer of blanking port, the heating interlayer at the top is a pre-desolventizing interlayer, and a pre-desolventizing layer indirect steam inlet and a pre-desolventizing layer condensate water outlet are respectively formed in the circumference of the pre-desolventizing interlayer; a plurality of heating interlayers in the middle are mixing and removing interlayers, and a mixing and removing layer direct steam inlet, a mixing and removing layer indirect steam inlet and a mixing and removing layer condensate water outlet are respectively formed in the circumference of each mixing and removing interlayer; a direct steam inlet of each mixing and separating layer is connected with an outlet of a corresponding steam-jet pump, a power steam inlet of each steam-jet pump is connected with a live steam pipe, and an injection opening of each steam-jet pump is connected with an extraction opening in the side wall of the upper part of the next layer through an extraction pipe; a bottom layer indirect steam inlet and a bottom layer condensed water outlet are formed in the circumference of the bottom heating interlayer. The equipment is simple in structure, high in desolventizing efficiency and large in capacity, and the equipment investment is reduced.

Description

Technical Field

[0001] The utility model relates to a desolventizer, in particular to a vacuum stripping desolventizer, belonging to the technical field of wet meal desolventizing equipment, and is used for removing n-hexane from wet meal drained by a leacher in the oil processing industry. Background Art

[0002] After the materials on the leaching production line of an oil extraction plant are leached by a leacher, the materials contain a large amount of n-hexane. After discharging from the leacher, it is necessary to remove the n-hexane contained in the materials, so a device for removing the solvent from the materials is required. The conventional desolventizing equipment is a vertical desolventizer, which is an indirect and direct heating desolventizing equipment under a slightly negative pressure condition. The desolventizing condition is a slightly negative pressure state, and the main purpose is to keep the equipment from leaking water vapor and solvent vapor, which is not helpful for the desolventizing effect of the desolventizer. Therefore, the vertical desolventizer has a large diameter and a high height, and requires a large amount of power. However, the desolventizing effect is general, and only by increasing the desolventizing volume can the desolventizing effect be increased. For the development of large-scale equipment, only by increasing the equipment size can the desolventizing capacity be improved. The equipment cost is high, and the cost of auxiliary facilities is also high. There is no new technology to improve the desolventizing capacity of this equipment.

[0003] How to achieve efficient desolventization without unnecessarily increasing the equipment size is also a difficult problem that all production enterprises need to solve. Summary of the Utility Model

[0004] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and the title of the utility model of this application, to avoid obscuring the purpose of this part, the abstract, and the title of the utility model. However, such simplifications or omissions shall not be used to limit the scope of the utility model.

[0005] In view of the above and / or problems existing in the prior art, the present utility model is proposed.

[0006] The purpose of the present utility model is to overcome the problems existing in the prior art and provide a vacuum stripping desolventizer, which can simplify the equipment structure, has high desolventizing efficiency, large production capacity, and reduces equipment investment.

[0007] To solve the above technical problems, a vacuum stripping desolventizer of the present utility model includes a closed cylinder body. A desolventizing gas phase outlet and a wet meal inlet are provided at the top of the cylinder body. Inside the cylinder body, a plurality of disk-shaped heating interlayers are sequentially arranged from top to bottom. A stirring shaft is arranged along the axis of the cylinder body. Stirring wings for stirring the materials on each heating interlayer are arranged on the stirring shaft. Rotary valves are respectively provided at the material discharge ports of each heating interlayer. The top heating interlayer is a pre-desolventizing interlayer. A pre-desolventizing layer indirect steam inlet and a pre-desolventizing layer condensate outlet are respectively provided on the circumference of the pre-desolventizing interlayer.

[0008] Multiple heating interlayers in the middle are stripping interlayers. A direct steam inlet, an indirect steam inlet, and a condensate outlet are respectively provided on the circumference of each stripping interlayer.

[0009] Each direct steam inlet of the stripping interlayers is respectively connected to the outlet of the corresponding steam ejector pump. The motive steam inlet of each steam ejector pump is connected to the live steam pipe. The ejector ports of each steam ejector pump are respectively connected to the air extraction ports on the upper side wall of the next lower layer through air extraction pipes.

[0010] A bottom layer indirect steam inlet and a bottom layer condensate outlet are provided on the circumference of the bottom heating interlayer.

[0011] As an improvement of the present utility model, the stirring fins of each stripping layer are respectively provided with two upper and lower layers and are arranged staggeredly.

[0012] As a further improvement of the present utility model, inner cylinders erected upward are respectively provided on the outer periphery of each pre-stripping interlayer. An annular channel is provided between the outer periphery of the inner cylinder and the inner wall of the cylinder body. The outer peripheries of the heating interlayers below the pre-stripping interlayer are all connected to the cylinder body.

[0013] As a further improvement of the present utility model, middle partitions are respectively provided between the top plate and the bottom plate of each stripping interlayer. A plurality of circular holes are evenly provided on the middle partition. Circular steam pipes are respectively welded between each circular hole and the top plate as direct steam channels. A plurality of direct steam holes are respectively provided in the top plate regions corresponding to the tops of the circular steam pipes; the direct steam inlet of the stripping layer is arranged on the side wall of the stripping interlayer below the middle partition.

[0014] An indirect steam channel is formed between the top plate and the middle partition and on the outer periphery of each circular steam pipe. The indirect steam inlet of the stripping layer is arranged on the side wall of the interlayer between the middle partition and the top plate. The condensate outlet of the stripping layer is located on the middle partition or on the side wall of the interlayer close to the middle partition.

[0015] As a further improvement of the present utility model, the lower end of the stirring shaft is driven by a motor speed reducer. Each heating layer is respectively provided with a level sensor, a maintenance door, and a manhole door.

[0016] As a further improvement of the present utility model, there are two pre-stripping interlayers.

[0017] As a further improvement of the present utility model, there are four stripping interlayers.

[0018] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. The first, second, and third layers of this vacuum stripping and desolventizing machine are still in a slightly negative pressure state (-0.3 kPa to 0 kPa), preventing the leakage of solvent vapor and water vapor. The fourth, fifth, sixth, and seventh layers are in a negative pressure state (-3 kPa to -1 kPa); this is helpful for the removal of solvents: the material is desolventized under a vacuum state, and fresh steam is introduced for desolventizing in each layer, so that the desolventizing effect can be greatly improved. Thereby reducing the diameter, height, and power configuration of the equipment, thus reducing the equipment investment and improving the desolventizing effect of the equipment;

[0019] 2. The height of the first and second layer material layers is increased to twice the original designed height; the mixing and stripping interlayers of the third, fourth, fifth, and sixth layers can conduct indirect steam and direct steam simultaneously; the fourth, fifth, and sixth layers use steam jet pumps to evacuate the space of each layer to a negative pressure, and the negative pressure of the final stripping interlayer of the seventh layer is greater than that of traditional equipment; for equipment with the same output, the number of layers is two less than that of traditional equipment, simplifying the equipment structure and reducing the equipment investment;

[0020] 3. The stirring wings of the third, fourth, fifth, and sixth layers are arranged in a staggered manner up and down, and the stirring effect is better;

[0021] 4. The motive steam of the steam jet pump and the mixture of the extracted water vapor and solvent can be used as the direct steam for the upper layer desolventizing, which can greatly reduce the energy consumption and improve the stripping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. The drawings are only for reference and description, and are not used to limit the present utility model. Among them:

[0023] Figure 1 is the front view of the vacuum stripping and desolventizing machine of the present utility model;

[0024] Figure 2 is Figure 1 the top view of;

[0025] Figure 3 is the sectional view along B-B of the present utility model;

[0026] Figure 4 is the sectional view along C-C of the present utility model;

[0027] Figure 5 is the sectional view along D-D of the present utility model;

[0028] Figure 6This is an enlarged view of the mixing and stripping interlayer in the present utility model;

[0029] Figure 7 It is Figure 6 an enlarged sectional view at the circular steam pipe in

[0030] In the figure: 1. Desolventized gas phase outlet; 2. Wet meal inlet; 3. Pre-desolventizing interlayer; 4. Manhole door; 5. Indirect steam inlet for pre-desolventizing layer; 6. Condensate outlet for pre-desolventizing layer; 7. Stirring fin; 8. Level sensor; 9. Maintenance door; 10. Rotary valve; 11. Power steam inlet; 12. Steam jet pump; 13. Direct steam inlet for mixing and stripping layer; 14. Air extraction port; 15. Mixing and stripping interlayer; 15a. Middle partition board; 15b. Circular steam pipe; 15c. Direct steam hole; 16. Condensate outlet for mixing and stripping layer; 17. Indirect steam inlet for mixing and stripping layer; 18. Bottom heating interlayer; 19. Motor reducer. Specific embodiments

[0031] In the following description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating that the device must have a specific orientation.

[0032] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below with reference to specific drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model.

[0034] As Figures 1 to 5 shown, the vacuum steam stripping desolventizer of the present utility model includes a closed cylinder body. The top of the cylinder body is provided with a desolventized gas phase outlet 1 and a wet meal inlet 2. The inner cavity of the cylinder body is provided with a plurality of disc-shaped heating interlayers from top to bottom. The first and second heating interlayers are pre-desolventizing interlayers 3. The circumferences of the pre-desolventizing interlayers 3 are respectively provided with an indirect steam inlet 5 and a condensate outlet 6 for the pre-desolventizing layer. An inner cylinder is erected upward on the outer circumference of each pre-desolventizing interlayer 3. An annular channel is provided between the outer circumference of the inner cylinder and the inner wall of the cylinder body. The outer circumferences of the heating interlayers below the pre-desolventizing interlayer 3 are all connected to the cylinder body.

[0035] The third to the sixth heating interlayers are stripping interlayers 15. On the circumferences of the respective stripping interlayers 15, there are respectively provided a stripping layer direct steam inlet 13, a stripping layer indirect steam inlet 17, and a stripping layer condensate outlet 16.

[0036] On the circumference of the bottom heating interlayer 18, there are provided a bottom indirect steam inlet and a bottom condensate outlet.

[0037] A stirring shaft is provided along the axis of the cylinder body. On the stirring shaft, there are stirring vanes 7 for stirring the materials on each heating interlayer. The stirring vanes 7 of each stripping layer are respectively provided with two upper and lower layers and are arranged staggeredly; rotary valves 10 are respectively provided at the blanking openings of each heating interlayer.

[0038] The respective stripping layer direct steam inlets 13 are respectively connected to the outlets of the corresponding steam jet pumps 12. The motive steam inlets 11 of each steam jet pump 12 are connected to the live steam pipe. The ejector ports of each steam jet pump 12 are respectively connected to the air extraction ports 14 on the upper side wall of the next lower layer through air extraction pipes;

[0039] The lower end of the stirring shaft is driven by a motor reducer 19. Each heating layer is respectively provided with a level sensor 8, a maintenance door 9, and a manhole door 4.

[0040] The solvent-containing wet meal coming out of the extractor enters the tray of the first pre-stripping interlayer in the desolventizer through the wet meal inlet 2. After being agitated by the stirring vanes 7, it is leveled and the material is moved to the discharge port, and falls onto the second pre-stripping interlayer through the rotary valve 10. Then, after being agitated by the stirring vanes 7, it is flattened and moved to the discharge port and enters the third stripping layer. The first and second pre-stripping interlayers are heated by indirect steam. The inner cylinder erected on the outer periphery doubles the height of the material layers in the first and second layers to the original designed height.

[0041] When the material accumulation in the third layer reaches the set height of 900 mm, after the level sensor 8 detects the material level, the material is evenly discharged into the fourth layer by controlling the speed of the rotary valve, and so on until the material is discharged from the seventh layer of the desolventizer.

[0042] The seventh layer uses the steam jet pump 12 to draw the water vapor and solvent gas flashed from the hot meal into the stripping layer direct steam inlet 13 of the sixth stripping interlayer, and then sprays it into the material through the bottom plate direct steam spray holes; at the same time, the sixth layer of the interlayer is also designed with a stripping layer indirect steam inlet 17, and after introducing indirect steam, it provides heat for the material; under the negative pressure working condition of the material, through the combined action of indirect steam and direct steam, the stripping and desolvation of the solvent in the material are completed. And so on, the above-mentioned desolvation process is completed in the fifth and fourth layers of the material.

[0043] The material is stripped by indirect steam and direct steam under the slightly negative pressure working condition in the third layer. Through the above seven-layer desolvation, the solvent content in the material can be lower than 100 ppm. All the solvent gas and water vapor generated by desolvation are discharged from the equipment through the top gas phase port and enter the first evaporator.

[0044] This stripping machine has the ability of high-vacuum multi-effect stripping with small equipment, realizing the stripping requirements of traditional equipment that can only complete large-output production by increasing the diameter and the number of layers.

[0045] When this equipment is operating, indirect steam will be introduced into all interlayers. The mixing and stripping interlayers 15 of the third, fourth, fifth, and sixth layers are all provided with an indirect steam inlet 17 for the mixing and stripping layer and a direct steam inlet 13 for the mixing and stripping layer. Indirect steam is introduced through the indirect steam inlet 17 for the mixing and stripping layer, and direct steam and solvent gas ejected by the steam jet pump 12 are introduced through the direct steam inlet 13 for the mixing and stripping layer.

[0046] In the fourth, fifth, and sixth layers, the steam jet pump 12 is used to evacuate the space of each layer to a negative pressure. This layer receives the water vapor from the lower layer and the water vapor evaporated by this layer is drawn into the upper layer. The seventh layer is a negative-pressure air extraction layer, and its water vapor is drawn into the upper layer and the negative pressure of the seventh layer is greater than that of traditional equipment; the motive steam of the steam jet pump 12 and the mixed gas of the extracted water vapor and solvent are used as the direct steam for stripping in the upper layer.

[0047] On the shell above the material layer of the fourth, fifth, sixth, and seventh layers of this equipment, air extraction ports 14 are all provided. The air extraction ports 14 are connected to the suction port of the steam jet pump 12 through pipelines. The motive steam inlet 11 of the steam jet pump 12 is connected to direct steam. The outlet of the jet pump is connected to the direct steam inlet 13 of the mixing and stripping layer in the interlayer. When the direct steam introduced into the steam jet pump 12 evacuates the vacuum, the solvent gas and water vapor in the lower-layer material are sucked in and mixed together, and jointly enter the direct steam inlet 13 of the mixing and stripping layer in the upper interlayer for stripping the material containing solvent.

[0048] The level sensor 8 is used to detect the height of the material in the equipment, and the rotary valve 10 is controlled by a frequency converter to convey the material to the lower layer.

[0049] As Figure 6 、 Figure 7 shown, between the top plate and the bottom plate of each mixing and stripping interlayer 15 of the third, fourth, fifth, and sixth layers, middle partitions 15a are respectively provided. A plurality of circular holes are evenly provided on the middle partitions 15a. Circular steam pipes 15b are respectively welded between each circular hole and the top plate as direct steam channels. A plurality of direct steam holes 15c are respectively provided in the top plate regions corresponding to the tops of the circular steam pipes 15b. The direct steam inlet 13 for the mixing and stripping layer is arranged on the side wall of the mixing and stripping interlayer below the middle partition 15a. The direct steam and the solvent gas from the lower layer enter the direct steam channel below the middle partition 15a, then enter each circular steam pipe 15b, and are sprayed into the upper-layer material through the direct steam holes 15c on the top plate.

[0050] An indirect steam passage is formed between the top plate and the middle partition plate 15a and on the outer periphery of each circular steam pipe 15b. An indirect steam inlet for the mixing and stripping layer is provided on the side wall of the interlayer between the middle partition plate 15a and the top plate, and a condensate outlet 16 for the mixing and stripping layer is provided at the lower part of the indirect steam passage. After the indirect steam enters the indirect steam passage to indirectly heat the material, the condensate is discharged.

[0051] The direct steam passage and the indirect steam passage are arranged in an interleaved manner. The mixing and stripping interlayers of the third, fourth, fifth, and sixth layers can be passed with indirect steam and direct steam at the same time, so as to achieve the purpose of the simultaneous operation of direct steam and indirect steam.

[0052] The above is only a preferred and feasible embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. It is not intended to limit the patent protection scope of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Except for the above embodiments, without departing from the spirit and scope of the present invention, the present invention can also have other implementation manners. The present invention will also have various changes and improvements. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention. The protection scope required by the present invention is defined by the appended claims and their equivalents. The technical features not described in the present invention can be realized by or adopted the existing technologies, and will not be elaborated herein.

[0053] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

Claims

1. A vacuum stripping and desolventizing machine, comprising a closed cylinder body. A desolventizing gas phase outlet and a wet meal inlet are provided at the top of the cylinder body. Inside the cylinder body cavity, a plurality of disk-shaped heating interlayers are successively arranged from top to bottom. A stirring shaft is arranged along the axis of the cylinder body. Stirring wings for stirring the materials on each heating interlayer are provided on the stirring shaft. Rotary valves are respectively provided at the material discharge ports of each heating interlayer. It is characterized in that: The top heating interlayer is a pre-stripping interlayer. A pre-stripping layer indirect steam inlet and a pre-stripping layer condensate water outlet are respectively provided on the circumference of the pre-stripping interlayer; A plurality of middle heating interlayers are mixing and stripping interlayers. A mixing and stripping layer direct steam inlet, a mixing and stripping layer indirect steam inlet and a mixing and stripping layer condensate water outlet are respectively provided on the circumference of each mixing and stripping interlayer; Each mixing and stripping layer direct steam inlet is respectively connected to the outlet of a corresponding steam ejector pump. The motive steam inlet of each steam ejector pump is connected to the live steam pipe. The ejector ports of each steam ejector pump are respectively connected to the air extraction ports on the upper side wall of the next lower layer through air extraction pipes; A bottom layer indirect steam inlet and a bottom layer condensate water outlet are provided on the circumference of the bottom heating interlayer.

2. The vacuum stripping and desolventizing machine according to claim 1, wherein: The stirring wings of each mixing and stripping layer are respectively provided with two upper and lower layers and are arranged staggeredly.

3. The vacuum stripping and desolventizing machine according to claim 1, characterized in that: Inner cylinders erected upward are respectively provided on the outer circumferences of each pre-stripping interlayer. An annular channel is provided between the outer circumference of the inner cylinder and the inner wall of the cylinder body. The outer circumferences of each heating interlayer below the pre-stripping interlayer are all connected to the cylinder body.

4. The vacuum stripping and desolventizing machine according to claim 1, characterized in that: Middle partition plates are respectively provided between the top plates and the bottom plates of each mixing and stripping interlayer. A plurality of circular holes are evenly provided on the middle partition plates. Circular steam pipes are respectively welded between each circular hole and the top plate as direct steam channels. A plurality of direct steam holes are respectively provided in the top plate regions corresponding to the tops of the circular steam pipes; The mixing and stripping layer direct steam inlet is arranged on the side wall of the mixing and stripping interlayer below the middle partition plate; An indirect steam channel is formed between the top plate and the middle partition plate and on the outer circumferences of each circular steam pipe. The mixing and stripping layer indirect steam inlet is arranged on the side wall of the interlayer between the middle partition plate and the top plate. The mixing and stripping layer condensate water outlet is located on the middle partition plate or on the side wall of the interlayer close to the middle partition plate.

5. The vacuum stripping and desolventizing machine according to claim 1, wherein: The lower end of the stirring shaft is driven by a motor reducer. Each heating layer is respectively provided with a level sensor, a maintenance door and a manhole door.

6. The vacuum stripping and desolventizing machine according to any one of claims 1 to 5, characterized in that: There are two layers of the pre-stripping interlayer.

7. The vacuum stripping and desolventizing machine according to any one of claims 1 to 5, characterized in that: There are four layers of the mixing and stripping interlayer.

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