Disc type circulating deodorization device

Abstract

A plurality of circulating steam stripping disc groups are arranged in a tower body, each group comprises a plurality of pairs of dispersing cones and collecting cones, each dispersing cone is positioned above the collecting cones, an oil collecting hopper is arranged below the collecting cone at the bottom, each group is provided with a central lifting pipe, the lower end of each central lifting pipe is immersed in the corresponding oil collecting hopper, and the lower end of each central lifting pipe is connected with the corresponding oil collecting hopper. The middle section of each central lifting pipe penetrates through the central hole of each conical disc, the upper port of each central lifting pipe is positioned below the cone top of the top dispersing cone, the outer edge of each collecting cone is respectively attached to the inner wall of the tower body, and an inner ring channel is arranged between the inner edge of each collecting cone and the outer wall of the central lifting pipe; the inner edge of each dispersion cone is attached to the outer wall of the central lifting pipe, and an outer ring channel is arranged between the outer edge of each dispersion cone and the inner wall of the tower body; a steam inlet pipe is arranged at the lower part of each circulating steam stripping disc group; and an outlet of each steam inlet pipe is positioned in the lower port of the corresponding central lifting pipe and is provided with a nozzle. The device is good in deodorization effect, small in resistance and good in vacuum degree.

Description

Technical Field

[0001] The utility model relates to a device for deacidifying, deodorizing and removing glycidyl ester of oil, in particular to a disc-type circulating deodorizing device, belonging to the technical field of complete deodorizing equipment. Background Art

[0002] Deodorization in the vegetable oil refining process is a high-temperature, high-vacuum steam distillation process, which not only removes free fatty acids and aldehydes, ketones, unsaturated hydrocarbons and other odor substances in the oil, but also removes peroxides, decomposition products produced by improper growth, transportation, and storage of oil, small molecular aromatic hydrocarbons, and pesticide residues. At the same time, the high-temperature process destroys some pigments and decomposes and removes them. Therefore, in addition to removing free fatty acids and odor components, increasing smoke point, reducing color, improving flavor, and extending shelf life, oil deodorization also needs to control the generation of harmful substances. At present, the public is paying more and more attention to food safety. Various countries have introduced corresponding laws and regulations to put forward higher requirements on the content of harmful substances such as trans fatty acids, glycidyl esters, trichloropropanol esters, plasticizers, gibbaralenone in refined oil. These harmful components have been proven to be strongly related to vacuum, temperature, time, stripping efficiency, and direct steam volume, but these conditions are mutually restricted and contradictory. In actual production, many indicators will lose sight of each other and it is difficult to meet all requirements; for example, high temperature and long time have a positive effect on removing free fatty acids, odor, plasticizers, gibbaralenone, improving smoke point, reducing color, etc., but the generation of harmful substances such as trans fatty acids, glycidyl esters, and deodorizing polymers will increase rapidly.

[0003] At present, the industry generally uses the double-tower variable temperature deodorization process, which uses the high temperature of the packed tower to quickly deacidify, deodorize, and remove harmful components; the low-temperature operation of the plate tower ensures the necessary reaction heat decolorization and thermal decomposition time, and controls the generation of harmful substances such as trans fatty acids, glycidyl esters, and deodorizing polymers.

[0004] The packed tower has the advantage of a large specific surface area. The oil is distributed in a thin film and contacts with water vapor in a countercurrent in a packing layer of a certain height. There is a certain contact time, so the stripping efficiency is high; however, there is gas phase resistance in the packing layer, and the vacuum of the lower packing becomes worse. High temperature and low vacuum will cause oil hydrolysis or polymer and harmful substances to form; the industry has confirmed that the amount of glycidyl ester generated is proportional to the deodorization temperature and time. The process of corn oil refining, deacidification and deodorization must avoid the hydrolysis of neutral oil, resulting in the generation of new free fatty acids. In the end, the stripping removal amount and the generation amount offset each other, and the overall removal efficiency is not high. In addition, in the production process of processing oil products that need to be frequently replaced, the packed tower has a large amount of liquid holding in the packing, oil remains in the packing layer, the emptying time is long and not thorough, and there is a phenomenon of mixing between the oil products after the oil change.

[0005] The plate tower provides the necessary residence time, and its main function is to decompose and remove small-molecular aromatic hydrocarbons, residual pesticides, and some pigments at high temperature; there is a certain oil level on each tower plate, and the stripping pump circulates to turn the bottom oil to the upper surface of the oil layer. The deodorization effect is only effective under the vacuum condition on the surface of the oil layer; but the existing stripping pump structure in the industry is a single flash cap exposed above the oil layer. The bottom oil is tumbled to the top of the oil layer and exposed to the vacuum environment for a limited time and surface area, and the stripping effect is often not good, so a longer residence time is required; and the steam of the circulating stripping pump of each oil tray of the plate tower cannot be reused as the stripping steam of the upper oil trays after a single stripping, and the utilization rate is not high.

[0006] There are various types of deodorization towers on the market, such as a combination tower of packing + plate tower, a single plate tower, and a complex deodorization tower system built by a packing tower through process pipelines. There is a lack of effective research and practice on the core components (packing, stripping pump) that truly improve the stripping efficiency, and the technical achievements of more than ten or twenty years ago are still used. For example:

[0007] The Chinese utility model patent with announcement number CN 209322825U discloses a vegetable oil refining deodorization tower system, which adopts the existing packed tower and plate tower in the prior art. The main technical problem solved is to improve the problem of low deodorization heat utilization rate, and does not involve the improvement of the packed tower and tower structure to improve the stripping efficiency.

[0008] The Chinese utility model patent with announcement number CN 211522141U discloses a deodorization tower system, the main device of which is still a packing + plate combination tower, and the main technical problem solved is the problem of vacuum gas phase capture and deodorization.

[0009] The Chinese utility model patent with announcement number CN 214654741U discloses a new deodorization tower for refineries and describes the structural improvement of the plate tower. It only improves the original small-hole jet stripping tube into a mammoth pump (also called a stripping pump) to improve the oil layer churning effect, and there are no other outstanding improvements.

[0010] The Chinese utility model patent with announcement number CN 215947229U discloses a deodorizing tower structure device, the core device of which still uses the existing structure of the packed tower and plate tower, and there is no improvement in the structure to improve efficiency. Utility Model Content

[0011] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0012] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0013] The utility model aims to overcome the problems existing in the prior art and provide a disc-type circulating deodorizing device with high gas-liquid contact frequency, large contact specific surface area, long contact time, good deodorizing effect, small gas phase resistance and good vacuum degree.

[0014] In order to solve the above technical problems, the utility model provides a disc-type circulating deodorizing device, including a tower body, an oil inlet is provided at the top of the tower body, an oil outlet is provided at the bottom of the tower body, a plurality of circulating steam stripping disc groups are provided along the height direction of the inner cavity of the tower body, each circulating steam stripping disc group includes a plurality of pairs of dispersion cones and collecting cones, each dispersion cone is located above the corresponding collecting cone, an oil collecting hopper is provided below the bottom collecting cone, each group is provided with a central lifting pipe along the axis of the tower body, the lower end of each central lifting pipe is immersed in the corresponding oil collecting hopper, and each central lifting pipe is provided with a plurality of pairs of dispersion cones and collecting cones, each dispersion cone is located above the corresponding collecting cone, and an oil collecting hopper is provided below the bottom collecting cone, each group is provided with a central lifting pipe along the axis of the tower body, and the lower end of each central lifting pipe is immersed in the corresponding oil collecting hopper. The middle section passes through the central holes of each dispersion cone and the collecting cone, the upper port of each central riser is located below the top of the top dispersion cone, the outer edge of each collecting cone is respectively attached to the inner wall of the tower body, and an inner ring channel is provided between the inner edge of each collecting cone and the outer wall of the central riser; the inner edge of each dispersion cone is attached to the outer wall of the central riser, and an outer ring channel is provided between the outer edge of each dispersion cone and the inner wall of the tower body; the lower part of each circulating stripping disc group is respectively provided with a steam inlet pipe, and the outlet of each steam inlet pipe is respectively located in the lower port of the corresponding central riser and is installed with a nozzle.

[0015] As an improvement of the utility model, each oil collecting hopper is provided with a coaxial oil collecting hopper outer cylinder and an oil collecting hopper inner cylinder, a channel is provided between the lower edge of each oil collecting hopper inner cylinder and the bottom wall of the oil collecting hopper, and a serrated overflow groove is provided on the top of each oil collecting hopper outer cylinder.

[0016] As a further improvement of the utility model, a vent is provided on the annular bottom wall between the outer tube of the oil collecting bucket and the inner tube of the oil collecting bucket, and each vent is connected to the vent main pipe through a vent valve and a vent short pipe, and the lower end of the vent main pipe is connected to the lower side wall of the tower body.

[0017] As a further improvement of the utility model, a steam injection pipe is provided in the lower oil cavity of the tower body.

[0018] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. It combines the functional features of a packed tower and a plate tower and effectively integrates them into one, thereby improving the vacuum degree at the bottom. Multiple pairs of diverging cones and collecting cones are strung together into a circulating stripping disc group, and a stripping pump is nested in the center of each disc group, in order to allow the oil film to contact the steam with countercurrent multiple times and ensure a certain vapor-liquid contact frequency, area and time. With this design, the oil film is always in a high vacuum environment during the downward flow under the action of gravity, and there is no air resistance to cause the vacuum to drop; steam is ejected through the nozzle to drive the oil to circulate up and down, and is also used for stripping steam of other stripping disc groups on the upper side; the greatest advantage of this improved circulating pump is that the oil film is exposed to the vacuum environment with the help of multiple pairs of umbrella cones.

[0019] 2. The stripping disc group has uniform distribution on the conical surface, thin and uniform wetting of the oil film on the conical surface, and the liquid holding capacity is greatly reduced relative to the packing layer. There is no dead angle of flow and no residue. It has good practicality in the semi-continuous deacidification and deodorization process of oil products that need to be replaced frequently. In addition, there is zero gap between the collecting cone and the tower body, and there is no bypass leakage of oil and steam, and no short circuit occurs, which further improves the efficiency of gas-liquid mass transfer.

[0020] 3. The oil layer in the oil collecting hopper at the bottom of the improved circulating pump is shallow, the vacuum degree is high, there is no static pressure loss of the oil layer liquid column, the residence time is short, and the oil is driven up by the circulating pump nozzle and dispersed downward by gravity. The liquid film is thin, the surface area is large, and there are multiple gas-liquid contacts under vacuum, which greatly enhances the efficiency. At the same time, it avoids the risks of oil hydrolysis or polymer and harmful substances generated by high temperature and low vacuum.

[0021] 4. The steam from a single set of circulating stripping discs is used for up and down circulation in the current oil layer, providing stripping steam in contact with the oil, and serving as stripping steam for other circulating stripping discs above it. The disc-type circulating deodorization device is equipped with many sets of circulating stripping discs according to process requirements, and the steam from the lower layer is reused in the upper disc group, which saves steam compared to the single use of existing plate towers.

[0022] 5. For occasions with large steam volume and the need to quickly remove residual components in the oil, the disc-type circulation deodorization device has greater advantages. The efficient mass transfer, high vacuum and short residence time of steam and oil in the process greatly reduce the chances of hydrolysis, polymerization or harmful reactions, and the amount of steam stripping removal is much greater than the amount generated in the process. For example, the removal of toxin glycidyl esters in the refining deodorization process, and the removal of free fatty acids, glycidyl esters and gibberellenone in the corn oil deodorization process, the removal rate has reached the international advanced level. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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 drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. The drawings are only provided for reference and explanation, not for limiting the present utility model. Among them:

[0024] Figure 1 It is a cross-sectional view of the disc-type circulation deodorization device of the utility model;

[0025] Figure 2 for Figure 1 Enlarged view of the lower part;

[0026] In the figure: 1. tower body; 2. oil inlet; 3. oil outlet; 4. dispersion cone; 5. collecting cone; 6. central lifting pipe; 7. steam inlet pipe; 8. nozzle; 9. outer cylinder of oil collecting hopper; 10. inner cylinder of oil collecting hopper; 11. vent valve; 12. vent main pipe; 13. steam injection pipe. DETAILED DESCRIPTION

[0027] In the following description of the utility model, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a specific direction.

[0028] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific figures. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] like Figure 1 , Figure 2 As shown, the disk-type circulating deodorizing device of the utility model comprises a tower body 1, an oil inlet 2 is arranged at the upper part of the tower body 1, an oil outlet 3 is arranged at the bottom of the tower body 1, and a plurality of circulating steam stripping disk groups are arranged in the inner cavity of the tower body along the height direction. Each circulating steam stripping disk group comprises a plurality of pairs of dispersion cones 4 and collecting cones 5, the top of each dispersion cone 4 faces upward and is located above the corresponding collecting cone 5, and the small end of each collecting cone 5 is downward.

[0031] Each circulating steam stripping disc group is provided with a central riser 6 along its own axis. The middle section of each central riser 6 passes through the central hole of each dispersion cone 4 and the collecting cone 5. The upper port of each central riser 6 is located below the cone top of the top dispersion cone 4. That is, the top dispersion cone 4 is a complete outer cone surface, and the center of the dispersion cone 4 below has a hole for the central riser 6 to pass through. The outer edge of each collecting cone 5 is respectively fitted to the inner wall of the tower body. The assembly of the collecting cone 5 and the tower body adopts a manufacturing method of pre-rolling and gradually tightening the embracing circle to ensure that there is zero gap between each layer of the collecting cone 5 and the tower body, and there is no bypass leakage of oil and steam and no short circuit. An inner ring channel is provided between the inner edge of each collecting cone 5 and the outer wall of the central riser 6.

[0032] The inner edge of each dispersion cone 4 is fitted to the outer wall of the central lifting pipe 6, and an outer ring channel is provided between the outer edge of each dispersion cone 4 and the inner wall of the tower body.

[0033] The oil inlet 2 at the top reaches the center of the top of the tower body radially, then turns downward and falls on the top of the dispersion cone 4, diffuses and flows downward along the outer cone surface of the dispersion cone 4, forms an oil curtain from the lower peripheral edge of the dispersion cone 4, and falls on the inner cone surface of the collecting cone 5 below, gathers and flows downward, and forms an oil curtain from the inner circle edge of the lower part of the collecting cone 5, and continues to fall on the outer cone surface of the dispersion cone 4 below. CFD is used to simulate the optimal dispersion angle of the dispersion cone.

[0034] The steam from below passes through the downward oil curtain on the inner periphery of the collecting cone, flows upward and inward and enters the inner annular channel between the collecting cone 5 and the central riser 6, continues to flow upward and outward, passes through the downward oil curtain on the outer periphery of the dispersion cone 4, enters the outer annular channel between the dispersion cone 4 and the inner wall of the tower body, then flows upward and inward again, passes through the oil curtain of the previous collecting cone 5, and so on.

[0035] An oil collecting hopper is provided below the bottom collecting cone 5. Each oil collecting hopper is provided with a coaxial oil collecting hopper outer cylinder 9 and an oil collecting hopper inner cylinder 10. A channel is provided between the lower edge of each oil collecting hopper inner cylinder 10 and the bottom wall of the oil collecting hopper. A serrated overflow groove is provided on the top of each oil collecting hopper outer cylinder 9.

[0036] The lower end of each central lifting pipe 6 is immersed in the center of the inner tube 10 of the oil collecting hopper, and the bottom is spaced from the bottom wall of the oil collecting hopper. The lower part of each circulating steam stripping disc group is provided with a steam inlet pipe 7, and the outlet of each steam inlet pipe 7 is located in the lower port of the corresponding central lifting pipe 6 and is installed with a nozzle 8. High-pressure steam enters the lower port of the central lifting pipe 6 and is sprayed upward from the nozzle 8. Since the inner cavity of the tower body is a vacuum environment,

[0037] The volume of steam is greatly magnified several times and flows upward rapidly, forming a huge stripping force, driving the oil in the oil collecting bucket to rush up along the central lifting pipe 6. After rushing out from the upper port of the central lifting pipe 6, it hits the inner wall of the top diffusion cone and splashes downward. In the process, free fatty acids and other substances are removed, and the steam continues to flow upward as the stripping steam for the upper plate group.

[0038] A steam injection pipe 13 is provided in the lower oil chamber of the tower body. After being stripped several times by the upper groups, the oil reaching the bottom of the tower body is stripped again by the injection steam to further complete the deodorization.

[0039] A vent is provided on the annular bottom wall between the oil collecting bucket outer tube 9 and the oil collecting bucket inner tube 10. Each vent is connected to the vent main pipe 12 through a vent valve 11 and a vent short pipe. The lower end of the vent main pipe 12 is connected to the lower side wall of the tower body. When changing the oil, open the vent valve 11 of each group, and the oil of each layer can flow to the lower part of the tower body through the vent main pipe 12.

[0040] The above description is only the preferred feasible embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model, but does not limit the scope of patent protection of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. In addition to the above embodiments, the utility model can also have other implementation modes without departing from the spirit and scope of the utility model. The utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents. The technical features not described in the utility model can be achieved by or using existing technologies, which will not be repeated here.

Claims

1. A disc-type circulating deodorizing device, comprising a tower body, an oil inlet is provided at the top of the tower body, and an oil outlet is provided at the bottom of the tower body, characterized in that: The inner cavity of the tower body is provided with a plurality of circulating steam stripping disc groups along the height direction, each circulating steam stripping disc group comprises a plurality of pairs of dispersion cones and collecting cones, each dispersion cone is located above the corresponding collecting cone, and an oil collecting hopper is provided below the bottom collecting cone, each group is provided with a central lifting pipe along the axis of the tower body, the lower end of each central lifting pipe is immersed in the corresponding oil collecting hopper, the middle section of each central lifting pipe passes through the central hole of each dispersion cone and the collecting cone, the upper port of each central lifting pipe is located below the cone top of the top dispersion cone, the outer edge of each collecting cone is respectively attached to the inner wall of the tower body, and an inner ring channel is provided between the inner edge of each collecting cone and the outer wall of the central lifting pipe; the inner edge of each dispersion cone is attached to the outer wall of the central lifting pipe, and an outer ring channel is provided between the outer edge of each dispersion cone and the inner wall of the tower body; the lower part of each circulating steam stripping disc group is provided with a steam inlet pipe, and the outlet of each steam inlet pipe is respectively located in the lower port of the corresponding central lifting pipe and is installed with a nozzle.

2. The disc-type circulation deodorizing device according to claim 1 is characterized in that: Each oil collecting hopper is provided with a coaxial oil collecting hopper outer cylinder and an oil collecting hopper inner cylinder, a channel is provided between the lower edge of each oil collecting hopper inner cylinder and the bottom wall of the oil collecting hopper, and a serrated overflow groove is provided on the top of each oil collecting hopper outer cylinder.

3. The disc type circulation deodorizing device according to claim 2 is characterized in that: A vent is provided on the annular bottom wall between the oil collecting bucket outer tube and the oil collecting bucket inner tube. Each vent is connected to a vent main pipe through a vent valve and a vent short pipe. The lower end of the vent main pipe is connected to the lower side wall of the tower body.

4. The disc-type circulation deodorizing device according to claim 1, 2 or 3, characterized in that: A steam injection pipe is arranged in the lower oil cavity of the tower body.

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