Venturi tube improved device for wet spraying

Abstract

The utility model relates to an improved Venturi tube device for wet spraying, which comprises a Venturi tube and a first spraying assembly, the inlet end of the Venturi tube is connected with a dust conveying pipe, the first spraying assembly comprises three nozzles which are arranged along the horizontal direction, and the three nozzles are connected with the dust conveying pipe. The three nozzles are arranged on the venturi tube close to the inlet end of the venturi tube, the three nozzles are located on the same circumference of the venturi tube, the circle centers of the three nozzles are located on the vertical central axis of the venturi tube, the included angle between every two adjacent nozzles on the same horizontal plane is 120 degrees, and the nozzles are communicated with the spraying turbid liquid conveying pipe; the second spraying assembly is located below the three nozzles and comprises an angle type spray head, the angle type spray head is communicated with the spraying liquid conveying pipe, and the distance between the angle type spray head and the three nozzles ranges from 75 mm to 125 mm. According to the utility model, the problems of shortened production cycle and high shutdown frequency caused by the disappearance of the dedusting and cooling effects of the venturi tube can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical process and engineering, in particular to an improved device for a venturi tube of wet spraying. Background Art

[0002] Glufosinate is a widely used herbicide. When preparing glufosinate, glufosinate is prepared by using glycine and phosphoric acid as raw materials to carry out acid-base neutralization, phosphorylation, phosphoric acid dehydration, condensation and other reactions in a reaction vessel to finally obtain a glufosinate compound.

[0003] In the production process of glufosinate intermediate MDP, solid particles and powders are generated due to side reactions, and these side reactions may contain unreacted raw materials or intermediates, as well as impurities generated by side reactions. In addition, part of the gas phase will precipitate in solid form after cooling, and the precipitated solids will gather and bridge in the equipment pipeline, blocking the pipeline. The cumulative effect will shorten the production time, and these impurities and precipitates may affect the purity and quality of the product, so they need to be removed from the system.

[0004] The solid particles and powders produced by the side reactions are generally removed by the following two methods: When the particle size of the solid particles and powders is greater than 2 μm, they are removed by a cyclone dust collector; when the particle size of the solid particles and powders is less than 2 μm, they are removed by wet dust removal, such as Figure 1 As shown, the wet dust removal device provided is a venturi tube wet dust removal device, and the wet dust removal device is a two-stage spray dust removal assembly designed in the venturi tube to spray and remove the dust sent into the venturi tube, wherein the first stage spray dust removal assembly includes three first spiral nozzles, and the three nozzles are distributed at 120° in the horizontal direction, and each group has an angle of 15° in the vertical direction. The nozzles are common spiral nozzles, and the second stage spray dust removal assembly is a second spiral nozzle, which is inserted into the center of the venturi tube 200mm below the venturi tube mouth in the form of an insertion tube, and the spiral nozzle is vertically downward. It is connected to the insertion tube and is located below the three first spiral nozzles. This group of nozzles is installed vertically downward in the wet dust removal device and can be used for short-term wet dust removal. However, after using this design for a period of time, the nozzles in the first-stage spray dust removal assembly are blocked one after another. When the upper nozzle is blocked, the dust removal and cooling effect is reduced, causing the second spiral nozzles in the second-stage spray dust removal assembly to be blocked one after another in about a week, thereby causing the dust removal and cooling effect of the Venturi tube to disappear, bringing heavier processing tasks to the subsequent work sections, and ultimately resulting in a shortened production cycle of the device, a high frequency of device shutdowns, and reduced production. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned problems existing in the prior art and to provide an improved device for a wet spraying venturi tube, which can avoid the problems of shortened production cycle and high parking frequency caused by the disappearance of the dust removal and cooling effect of the venturi tube.

[0006] The utility model provides a venturi tube improvement device for wet spraying, comprising a venturi tube, wherein the inlet end of the venturi tube is connected to a dust conveying pipe, and further comprising:

[0007] A first spray assembly, comprising three nozzles arranged in a horizontal direction, wherein the three nozzles are arranged on the venturi tube near the inlet end of the venturi tube, and the three nozzles are located on the same circumference of the venturi tube, and the center of the circle is located on the vertical central axis of the venturi tube, and the angle between two adjacent nozzles on the same horizontal plane is 120°, and each nozzle is connected to a spray turbid liquid delivery pipe;

[0008] The second spray assembly is located below the three nozzles, and the second spray assembly includes an angle spray head, the angle spray head is connected to the spray liquid delivery pipe, and the distance between the angle spray head and the three nozzles is 75-125mm.

[0009] Preferably, the nozzle is a flat nozzle.

[0010] Preferably, the opening thickness of the flat nozzle is 3-5 mm.

[0011] Preferably, the angle nozzle is a 90° angle nozzle, and the 90° angle nozzle is connected to the outlet of the spray liquid delivery pipe.

[0012] Preferably, the spray liquid delivery pipe is connected to the clear liquid output pipe after being recovered by the condenser.

[0013] Preferably, the outlet end of the venturi tube is connected with a discharge elbow.

[0014] Preferably, the inner diameter of the discharge elbow is smaller than the inner diameter of the Venturi tube.

[0015] Preferably, the distance between the three nozzles and the inlet end of the venturi tube is 0-500 mm.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model provides an improved device for a wet spraying venturi tube, which solves the problem that the dust removal and cooling effect of the device is reduced due to the successive clogging of the nozzles in the first-stage spray dust removal component, which in turn causes the nozzles in the second-stage spray dust removal component to be successively clogged in about a week, thereby causing the dust removal and cooling effect of the venturi tube to disappear, bringing heavier processing tasks to subsequent work sections, and ultimately leading to a shortened production cycle of the device, a high frequency of device shutdowns, and a reduction in production volume. This is because: the original three spray heads are replaced with three nozzles, so that the sprayed turbid liquid is not a mist liquid film, but a liquid layer with a certain thickness. The total liquid thickness formed by the nozzles in three directions is better than the previous design, which removes the larger impurity particles in the dust-containing gas phase. The recycled spray turbid liquid is still used here, which is the same as the previous design, but after the change, it is no longer like the previous nozzle, which is blocked at a high frequency; in addition, the nozzle in the second spray assembly is changed to an angle nozzle with a larger diameter, and the installation form is no longer installed vertically. After the liquid enters, a vortex is formed along the tangent of the angle nozzle, thereby forming a spraying area, reducing the pressure loss here, and the dust reduction and cooling effect at the venturi tube is significantly improved. The venturi tube is no longer blocked, which no longer affects the dust removal capacity of the plate tower of the next process unit, and meets the processing requirements that this unit should meet.

[0018] 2. The utility model avoids the problem of high frequency of cleaning after the entire Venturi pipeline needs to be disassembled and cleaned after blockage. Secondly, due to the reduced pressure drop after the improvement, there is no more accumulation of material inside the Venturi tube, which reduces the frequency of failure of subsequent unit circulation pumps and reduces equipment maintenance costs. At the same time, after the pressure drop is reduced, the initial end pressure of the system does not need to be increased, which significantly improves the cost reduction during the entire operation cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a venturi tube device for wet spraying before the technical improvement of the prior art;

[0020] Figure 2 The utility model is a schematic diagram of a venturi tube improvement device for wet spraying.

[0021] Description of reference numerals:

[0022] 1. Venturi tube, 2. Nozzle, 3. Angle nozzle, 4. Discharge elbow, 5. First spiral nozzle, 6. Second spiral nozzle, 7. Sealing tube. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-2, the specific implementation of the utility model is described in detail, but it should be understood that the protection scope of the utility model is not limited by the specific implementation. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] The inventors have discovered that the existing wet spraying venturi tube device has the problem that the dust removal and cooling effect of the venturi tube disappears, which leads to a shortened production cycle and a high frequency of shutdowns.

[0025] In order to solve the problems existing in the above-mentioned prior art, the utility model provides an improved device for a venturi tube of wet spraying.

[0026] Refer to the attached Figure 2 As shown, in the embodiment, an improved venturi tube device for wet spraying includes a venturi tube 1, the inlet end of the venturi tube 1 is connected to a dust conveying pipe, and also includes: a first spray assembly and a second spray assembly, wherein the first spray assembly includes three nozzles 2 arranged in a horizontal direction, the three nozzles 2 are arranged on the venturi tube 1 near the inlet end of the venturi tube 1, and the three nozzles 2 are located on the same circumference of the venturi tube 1, and the center of the circle is located on the vertical central axis of the venturi tube 1, the angle between two adjacent nozzles 2 on the same horizontal plane is 120°, each nozzle 2 is connected to the spray turbid liquid conveying pipe, and the outlets of the three nozzles 2 are all located in the venturi tube 1, and the inlets of the three nozzles 2 are located outside the venturi tube 1; the second spray assembly is located below the three nozzles 2, and the second spray assembly includes an angular nozzle 3, which is connected to the spray liquid conveying pipe.

[0027] Working principle:

[0028] The original three spray heads are replaced with three nozzles 2, so that the sprayed turbid liquid is not a mist liquid film, but a liquid layer with a certain thickness. The total thickness of the liquid formed by the three-directional nozzles 2 is better than the previous design, and the larger impurity particles in the dust-containing gas phase are removed. The recycled spray turbid liquid is still used here, which is the same as the previous design, but after the change, it is no longer like the previous nozzle, which is blocked at a high frequency; in addition, the angle nozzle 3 in the second spray assembly is changed to an angle nozzle with a larger diameter, and the installation form is no longer installed in a vertical form. After the liquid enters, a vortex is formed along the tangent of the angle nozzle 3, thereby forming a spray area, reducing the pressure loss here, and the dust reduction and cooling effect at the venturi tube 1 is significantly improved. The venturi tube 1 is no longer blocked, which no longer affects the dust removal capacity of the plate tower of the next process unit, and meets the processing requirements that this unit should meet.

[0029] Specifically, the distance between the three nozzles 2 and the angle nozzle 3 is 75-125 mm, and the optimal distance is 100 mm.

[0030] The purpose of this design is to compare the Figure 1 and attached Figure 2 It can be seen that the utility model shortens the longitudinal spacing of the sprays in the first spray assembly and the second spray assembly, making the spray area more concentrated. The original spray spacing was 1000mm, and the current spray spacing is 100mm. The benefit of this optimization is that the liquid film area formed by the longitudinal liquid is more concentrated, which is better for the gas-liquid two-phase exchange. The temperature difference between the liquid and the gas here is about 140°C. The concentration of the liquid film can effectively prevent a small area from being vaporized to form holes. The holes will cause the gas phase to short-circuit and cannot fully contact the liquid phase, thereby increasing the processing capacity of the next unit.

[0031] Specifically, nozzle 2 is a flat-mouth nozzle, so what is sprayed out is not a mist liquid film, but a liquid layer with a certain thickness. The total thickness of the liquid formed in three directions is better than the previous design, and it removes relatively large impurity particles in the dust-containing gas phase. It is the same as the previous design, but after the change, it is no longer like the previous nozzle. This is because the flat-mouth nozzle is not easy to gather particles, and the spiral nozzle is easy to gather particles, so it will not be blocked at a high frequency, and it can form a liquid film more effectively. Compared with other nozzles, it does not spray in a mist, but maintains a liquid film of a certain thickness.

[0032] Specifically, the opening thickness of the flat nozzle is 3-5 mm. Here, when the opening thickness of the flat nozzle is 3-5 mm, the thickness of the formed liquid layer is the thickest.

[0033] Specifically, the angle nozzle 3 is a 90° angle nozzle, and the inner diameter of the 90° angle nozzle is larger than the inner diameter of the spray liquid delivery pipe.

[0034] The nozzle is changed to a 90° angle nozzle with a larger diameter. It is no longer installed vertically. Instead, the 90° angle nozzle is threadedly connected to the outlet of the spray liquid delivery pipe. After the liquid enters, it does not need to turn, but directly forms a vortex along the tangent direction of the angle nozzle, thereby forming a spray area and reducing the pressure loss here.

[0035] The 90° angle nozzle of the utility model is installed differently from the previous spiral nozzle. The previous connection is that the second spiral nozzle is connected to the spray turbid liquid delivery pipe through a 90° short tube, so the material first enters the second spiral nozzle after a 90° deflection. Now the direct material is not installed with a 90° short tube, but the 90° angle nozzle is connected to the outlet thread of the spray liquid delivery pipe, so the liquid enters tangentially and is sprayed out by centrifugal force. Secondly, the aperture of this right-angle nozzle is higher than the previous spiral aperture, so the spraying area is larger.

[0036] Specifically, the spray liquid delivery pipe is connected to the output pipe of the clear liquid recovered by the condenser. Compared with the prior art, the spray liquid delivery pipe of the utility model is connected to the output pipe of the clear liquid recovered by the condenser, and the mass and heat transfer efficiency of the clear liquid recovered by the condenser is better, the dust removal and temperature reduction effect is obvious, and no clogging occurs.

[0037] Specifically, the outlet end of the venturi tube 1 is connected with a discharge elbow 4 .

[0038] The optimization and improvement here is made in consideration of the previous design defects. The outlet end of the improved venturi tube 1 is converted into a curved discharge, and no blind spot is left.

[0039] Specifically, the inner diameter of the discharge elbow 4 is smaller than the inner diameter of the venturi tube 1 .

[0040] The improvement here is to reduce the pipe diameter from 400mm to 350mm, increase the gas velocity, thereby improving the scouring of the elbow and reducing the bridging phenomenon caused by material accumulation. In the use after the improvement, the pressure drop of the entire Venturi is uniform, and the previous phenomenon of large pieces of material falling off and causing pump damage rarely occurs.

[0041] Specifically, the distance between the three nozzles 2 and the inlet end of the venturi tube 1 is 0-500 mm. This makes the liquid phase area more concentrated. If the distance between the two layers of liquid phase area is too large, and the temperature difference between the two sections remains unchanged, the spraying effect of the lower section will be weakened. (The two sections include the upper section and the lower section, the upper section here refers to the nozzle 2, and the lower section refers to the 90° angle nozzle).

[0042] Reference Figure 1 As shown in the figure, the direction of the spray liquid entering is above the three spray heads. The three spray heads are evenly distributed at 120° in the horizontal direction and 15° downward in the vertical direction. The three spray points form three longitudinal spray areas at their respective angles. The second spray point is below the three spray heads. There is only one spray head here. After the spray liquid comes in, it forms a conical spray liquid film inside the Venturi tube through the spray head in the vertical direction. The upper and lower spray heads are spiral spray heads of the same size, and the upper and lower spray liquids are both turbid liquids that are recycled. There is no difference between the two spray liquids. After this design has been used for a period of time, two problems have emerged. The first is that due to the angle of the first group of three nozzles, the thickness of the liquid film in the spraying area is insufficient. After contacting with the dust-laden gas, the mass transfer and heat transfer effects are poor, resulting in high local temperature, which leads to dust adhesion after uneven heating of a certain nozzle. After the cumulative effect occurs, the nozzle is quickly blocked, and the dust-laden gas entering is easily short-circuited; the second is that there is a blind end seal at the air outlet end of the Venturi tube at the bottom of the Venturi tube, which causes material accumulation and obvious bridging effect. It will fall off unexpectedly in large and hard pieces and enter the filter of the circulating pump of the next processing unit, causing damage to the pump and seal.

[0043] The utility model is to the above-mentioned Figure 1 The disadvantages of the given device are improved, the longitudinal spacing between the upper and lower groups of sprays is shortened, and the spray area is more concentrated. The original spray spacing is 1000mm, and the current spray spacing is 100mm. The benefit of this optimization is that the liquid film area formed by the longitudinal liquid is more concentrated. At the same time, the longitudinal angle is cancelled for the three groups of sprays above, and the nozzle is not used at the end, but a flat tube with a certain thickness is selected to be added. In this way, the spray is not a mist-like liquid film, but a liquid layer with a certain thickness. The total thickness of the liquid formed in the three directions is better than the previous design, and the larger impurity particles in the dust-containing gas phase are removed. The recycled spray turbid liquid is still used here, which is the same as the previous design, but after the change, it is no longer like the previous nozzle, and the high-frequency blockage phenomenon occurs; Figure 2 The nozzle shown is changed to a 90° angle nozzle with a larger diameter, and is no longer installed vertically. After the liquid enters, a vortex is formed along the tangent direction of the angle nozzle, thereby forming a spraying area, reducing the pressure loss here. At the same time, the spray liquid used here is no longer a turbid liquid, but a clear liquid recovered from the condenser. Overall comparison shows that the flow rate here is higher, the mass transfer and heat transfer efficiency is better, the dust removal and cooling effect is obvious, and no blockage occurs.

[0044] Figure 2 As shown in the figure, the previous device has been optimized and improved. Taking into account the previous design defects, the outlet end of the improved Venturi tube is converted to a bend discharge, leaving no blind spot, and at the same time the diameter is reduced from the previous 400mm to 350mm, thereby increasing the gas velocity, thereby increasing the scouring of the elbow and reducing the bridging phenomenon caused by material accumulation. In the use after the improvement, the pressure drop of the entire Venturi is uniform, and the pump damage caused by the falling of large pieces of material rarely occurs.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A venturi tube improvement device for wet spraying, comprising a venturi tube (1), wherein the inlet end of the venturi tube (1) is connected to a dust conveying pipe, characterized in that: Also includes: A first spray assembly comprises three nozzles (2) arranged in a horizontal direction, wherein the three nozzles (2) are arranged on the venturi tube (1) near the inlet end of the venturi tube (1), the three nozzles (2) are located on the same circumference of the venturi tube (1), the center of the circle is located on the vertical central axis of the venturi tube (1), the angle between two adjacent nozzles (2) on the same horizontal plane is 120°, and each nozzle (2) is connected to a spray turbid liquid delivery pipe; The second spray assembly is located below the three nozzles (2), and the second spray assembly comprises an angle spray head (3), the angle spray head (3) is connected to the spray liquid delivery pipe, and the distance between the angle spray head (3) and the three nozzles (2) is 75-125 mm.

2. The improved device for wet spraying venturi tube according to claim 1, characterized in that: The nozzle (2) is a flat nozzle.

3. The improved device for wet spraying venturi tube according to claim 2, characterized in that: The opening thickness of the flat nozzle is 3-5 mm.

4. The improved device for wet spraying venturi tube according to claim 1, characterized in that: The angled nozzle (3) is a 90° angled nozzle, and the 90° angled nozzle is connected to the outlet of the spray liquid delivery pipe.

5. The improved device for wet spraying venturi tube according to claim 1, characterized in that: The spray liquid delivery pipe is communicated with the clear liquid output pipe recovered by the condenser.

6. The improved device for wet spraying venturi tube according to claim 1, characterized in that: The outlet end of the venturi tube (1) is connected to a discharge elbow (4).

7. The improved device for wet spraying venturi tube according to claim 6, characterized in that: The inner diameter of the discharge elbow (4) is smaller than the inner diameter of the Venturi tube (1).

8. The improved device for wet spraying venturi tube according to claim 1, characterized in that: The distance between the three nozzles (2) and the inlet end of the venturi tube (1) is 0-500 mm.

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