Pipeline dosing device
The design of the dual-chamber alternating mixing and stirring mechanism solves the problem of uneven mixing of naphtha and alkali solution, achieving high-precision constant volume and ratio mixing, and improving the efficiency and effectiveness of the naphtha desulfurization process.
Patent Information
- Application Number
- CN202423155032.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-20
AI Technical Summary
In existing technologies, the mixing of naphtha and alkaline solution is uneven and the material ratio is inaccurate, which affects the desulfurization effect.
The pipeline dosing device adopts a dual-chamber alternating mixing system. It feeds and adds chemicals alternately through independent first and second mixing chambers, combined with a stirring mechanism to achieve constant volume and ratio mixing. The horizontal shaft drives the stirring frame to stir, ensuring uniform mixing.
This method achieves high-precision mixing of naphtha and alkali solution, improves mixing efficiency, ensures that materials enter the reaction tank quickly, avoids affecting production schedule, and enhances desulfurization effect.
Smart Images
Figure CN223628544U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of dosing and mixing, in particular to a pipeline dosing device. BACKGROUND
[0002] In the production of naphtha, the pre-sequence material preparation of the desulfurization process includes the mixing of naphtha and lye. The lye needs to be premixed through a pipeline or a front-end mixing tank before the desulfurization feed. Whether the mixing of naphtha and lye is uniform and whether the material ratio is accurate in this step determines the subsequent desulfurization effect.
[0003] In the existing facilities, the mixing is mostly achieved by monitoring the material flow rate and controlling the amount of lye added to achieve the required mixing ratio with naphtha. However, due to the small amount of lye added, there is always some error in real-time mixing based on flow in dynamic processing, and even if a static mixer is used, the mixing effect is still not good. SUMMARY
[0004] The purpose of the utility model is to provide a pipeline dosing device which has high dosing accuracy, good mixing effect, and does not affect the production progress in continuous operation.
[0005] To achieve the above purpose, the following technical solutions are used:
[0006] A pipeline dosing device includes a premixing barrel arranged horizontally, a partition plate arranged in the middle of the premixing barrel to separate it, a first mixing chamber and a second mixing chamber with equal capacity arranged on both sides of the partition plate, a first distribution pipe and a first dosing pipe connected to the top of the first mixing chamber, a first discharge pipe connected to the bottom of the first mixing chamber, a second distribution pipe and a second dosing pipe connected to the top of the second mixing chamber, and a second discharge pipe connected to the bottom of the second mixing chamber. The openings of the first distribution pipe and the second distribution pipe are staggered, the openings of the first discharge pipe and the second discharge pipe are staggered, and a stirring mechanism is arranged in each of the first mixing chamber and the second mixing chamber.
[0007] The stirring mechanism includes a horizontal shaft and a stirring frame. The horizontal shaft penetrates the middle of the premixing barrel horizontally and is rotatably installed with the premixing barrel. The stirring frame includes two parts arranged in the first mixing chamber and the second mixing chamber respectively. The stirring frame is fixed on the horizontal shaft, and the stirring frame includes multiple blades.
[0008] The blade is a flat blade, multiple raised buckets are arranged in a matrix on the blade, a bucket mouth is arranged on the end face of the side close to the horizontal shaft of the bucket, and the bucket mouth is arranged on the side away from the blade.
[0009] The shape of the bucket is an arc triangular pyramid.
[0010] The adjacent horizontal rows of the buckets are staggered.
[0011] The amount of the feed and the amount of the additive added into the first mixing cavity and the second mixing cavity are equal respectively each time.
[0012] The bottom of the mixing cavity is downwardly inclined from one end of the premixing cylinder to the baffle, so that the bottom center of the premixing cylinder is the lowest point, and the first discharge pipe and the second discharge pipe are arranged close to the baffle.
[0013] Valves with independent control liquid paths are arranged on the first discharge pipe, the second discharge pipe, the first distribution pipe, the second distribution pipe, the first additive pipe and the second additive pipe respectively.
[0014] The first additive pipe and the second additive pipe are communicated with the alkali tank respectively.
[0015] The upper end of the first distribution pipe and the upper end of the second distribution pipe are connected with a feed pipe through a tee pipe, and the feed pipe is communicated with the naphtha conveying pipeline.
[0016] Compared with the prior art, the utility model has the beneficial effects that:
[0017] Through the two mixing cavities arranged independently, alternating feeding, adding and discharging are carried out respectively, so that alternating proportioning and mixing are realized, the mixed material can quickly enter the reaction tank, the efficiency is improved and the production progress of the next link is not affected. Meanwhile, through the constant-volume mixing cavities, the material and the additive are added quantitatively respectively, so that the dynamic adding is more accurate, the constant volume and the constant ratio are realized, and the adding precision is improved. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is the overall view of the utility model.
[0019] Figure 2 It is the internal structure schematic view of the utility model.
[0020] Figure 3 It is the internal structure schematic view of the utility model. Figure 2 It is the X part enlarged view of the utility model.
[0021] Figure 4 It is the schematic view of the stirring frame of the utility model.
[0022] Reference signs shown in the drawings:
[0023] 1, premixing cylinder; 2, feed pipe; 3, first mixing cavity; 4, first distribution pipe; 5, first additive pipe; 6, first discharge pipe; 7, second mixing cavity; 8, second distribution pipe; 9, second additive pipe; 10, second discharge pipe; 11, horizontal shaft; 12, mounting ring frame; 13, fixed frame; 14, blade; 15, bucket; 16, bucket mouth; 17, baffle. DETAILED DESCRIPTION
[0024] The utility model will be further explained below in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the present application.
[0025] The instruments, reagents, materials and the like involved in the following examples are conventional instruments, reagents, materials and the like existing in the prior art, and can be obtained through regular commercial channels if not specifically stated. The experimental methods, detection methods and the like involved in the following examples are conventional experimental methods, detection methods and the like existing in the prior art if not specifically stated.
[0026] Embodiment:
[0027] The alkaline solution and the naphtha will indeed react after mixing, which is mainly used for removing sulfides in naphtha. The active sulfides such as H2S and RSH in naphtha will react with the alkaline solution (usually NaOH) to generate the corresponding sodium salt and dissolve in the alkaline solution, thereby achieving the purpose of desulfurization. The mixing is usually carried out by rapid mixing in the pipeline. Since the proportion of the alkaline solution is small, there is a common problem of poor mixing effect.
[0028] The present example adopts the characteristics of double-cavity alternating mixing. The main structure includes a premixing cylinder 1. The premixing cylinder 1 is arranged transversely. A partition plate 17 is arranged in the center of the premixing cylinder 1 to divide it. The two sides of the partition plate 17 divide the premixing cylinder 1 into two mixing cavities arranged in parallel and symmetrically, which are a first mixing cavity 3 and a second mixing cavity 7, respectively. The capacities of the two mixing cavities are constant L.
[0029] First and second discharge pipes 6 and 10 are arranged in parallel on the two sides of the partition plate 17, respectively. The top end of the first discharge pipe 6 is in communication with the first mixing cavity 3. The top end of the second discharge pipe 10 is in communication with the second mixing cavity 7. Electrically controlled discharge valves are respectively installed on the first and second discharge pipes 6 and 10 to control the pipeline passage.
[0030] The bottom of the mixing cavity is inclined downward from one end of the premixing cylinder 1 to the partition plate 17, so that the bottom center of the premixing cylinder 1 is the lowest point. The positions close to the partition plate 17 of the first and second mixing cavities 3 and 7 are the lowest points of them, respectively, which is beneficial to the emptying of the liquid.
[0031] A feeding pipe 2 and a dosing pipe are arranged above the premixing cylinder 1.
[0032] The two medicine pipes are communicated with the first mixing cavity 3 and the second mixing cavity 7 respectively at the bottom end, and the medicine pipes are communicated with the liquid alkali tank to realize the addition of alkali liquid into the premixing barrel 1.
[0033] One end of the feeding pipe 2 is communicated with the naphtha material delivery pipeline to input the naphtha raw material into the premixing barrel 1.
[0034] The other end of the feeding pipe 2 is connected with the first distribution pipe 4 and the second distribution pipe 8 through a three-way pipe, and the first distribution pipe 4 and the second distribution pipe 8 are respectively provided with electrically controlled distribution valves for opening and closing the pipeline communication.
[0035] The first distribution pipe 4 and the second distribution pipe 8 are alternately connected and not connected at the same time, and the first discharge pipe 6 and the second discharge pipe 10 are alternately connected and not connected at the same time, so that the first mixing cavity 3 and the second mixing cavity 7 are alternately connected to the naphtha and the alkali liquid for mixing and then alternately discharged to realize continuous mixing and feeding.
[0036] The middle part of the premixing barrel 1 is transversely penetrated by a transverse shaft 11 which is rotationally connected thereto, one end of the transverse shaft 11 is exposed outside the premixing barrel 1 and is rotationally driven based on the motor. The transverse shaft 11 is respectively provided with a stirring frame in the two mixing cavities, the stirring frame includes a mounting ring 12 which is sleeved on the transverse shaft 11, both ends of the mounting ring 12 are respectively provided with a vertical fixing frame 13, the fixing frame 13 is a rod and is provided with a mounting groove in the inside, the fixing frame 13 is three and is arranged in an annular array relative to the mounting ring, a blade 14 is fixedly installed between the fixing frames 13, the blade 14 is a flat blade 14 which can effectively bring up the material upward and stir, the blade 14 is three, both sides of the blade 14 are inserted into the mounting grooves in the inside of the fixing frame 13 and are fixed by screws, a plurality of convex buckets 15 are arranged on the blade 14, the convex direction of the bucket 15 is opposite to the material facing surface (the surface which is in contact with the material during overturning) of the blade 14, the bucket 15 is a bucket-shaped shell structure and is an open structure on the material facing surface of the blade 14, a bucket mouth 16 is arranged on the side end surface of the bucket 15 close to the transverse shaft 11, the shape of the bucket 15 is an arc triangular pyramid shape, so that the liquid is more easily concentrated to the bucket mouth 16. The adjacent transverse rows of the buckets 15 are arranged in a staggered manner, which is beneficial to the dispersion of the material.
[0037] Through the rotation of the horizontal shaft 11, the two stirring frames in the two mixing cavities can be driven to perform stirring actions, reducing the configuration of motors and transmission assemblies. Through the up-and-down stirring of the blades 14, the materials can be well mixed at the same time of feeding. In the process of being pushed upward by the blades 14, the liquid is respectively shunted through the matrix-arranged hopper 16, realizing the cutting of the liquid material and the mixing with the liquid material below, and improving the stirring and mixing effects.
[0038] When the device is actually operated, the sequence is as follows:
[0039] The first material distribution pipe 4 is connected to the quantitative naphtha L', and the first dosing pipe 5 adds the alkali L" at the same time of feeding. The feeding is mixed at the same time of stirring. After the feeding is completed, the first material distribution pipe 4 and the first dosing pipe 5 are closed, and the first discharge pipe 6 can be opened to discharge the materials;
[0040] When the first discharge pipe 6 discharges the materials, the second material distribution pipe 8 and the second dosing pipe 9 are opened to respectively add the naphtha L' and the alkali L" to the second mixing cavity 7. The adding process is continuously stirred. After the feeding is completed, the second material distribution pipe 8 and the second dosing pipe 9 are closed, and the second discharge pipe 10 can be opened to discharge the materials;
[0041] The feeding and discharging of the first mixing cavity 3 and the second mixing cavity 7 are alternately performed, so that on the one hand, continuous production can be realized without reserving time for mixing materials, and the mixed materials can quickly enter the reaction tank for reaction, avoiding the incompatibility of long waiting time for the reaction.
[0042] The capacities of the two mixing cavities are the same, and the sum of L' and L" is equal to or less than L. The naphtha and the alkali added through the two mixing cavities are respectively set quantitatively, realizing high-precision proportional control, and avoiding the problem of poor accuracy caused by dynamic dosing based on flow.
[0043] In summary, the device has the advantages of constant volume and constant ratio, high-precision batching, double-cavity alternating operation, and efficient and uniform mixing, and is very suitable for the premixing process before desulfurization.
[0044] It should be understood that the use described above is not limited to the examples described above. After the feeding of the mixing cavity is completed, the stirring can also be continuously performed for a certain time. The specific process and requirements are determined. Based on the control of the electric control valve on the pipeline, the operation and parameter setting can be flexible, and the application range is wide.
Claims
1. A pipe dosing device, characterized in that The premixing barrel is horizontally arranged, and a partition plate is arranged in the middle of the premixing barrel to separate the premixing barrel into a first mixing cavity and a second mixing cavity with equal volume on the two sides of the partition plate; the top of the first mixing cavity is connected with a first material distribution pipe and a first medicine adding pipe, and the bottom of the first mixing cavity is connected with a first discharging pipe; the top of the second mixing cavity is connected with a second material distribution pipe and a second medicine adding pipe, and the bottom of the second mixing cavity is connected with a second discharging pipe; the opening of the first material distribution pipe and the second material distribution pipe is staggered, and the opening of the first discharging pipe and the second discharging pipe is staggered; and a stirring mechanism is arranged in each of the first mixing cavity and the second mixing cavity.
2. A pipe dosing device according to claim 1, characterised in that The stirring mechanism comprises a horizontal shaft and a stirring frame, the horizontal shaft is horizontally arranged through the middle of the premixing barrel and is rotatably arranged in the premixing barrel, the stirring frame is arranged in each of the first mixing cavity and the second mixing cavity, the stirring frame is fixed on the horizontal shaft, and the stirring frame comprises a plurality of blades.
3. A pipe dosing device according to claim 2, characterised in that The blade is a flat blade, a plurality of convex buckets are arranged on the blade in a matrix, the bucket is provided with a bucket mouth on the side end face close to the horizontal shaft, and the bucket mouth is arranged on the side away from the blade.
4. The inline chemical injection apparatus of claim 3, wherein, The shape of the bucket is an arc triangular pyramid.
5. The inline chemical injection apparatus of claim 3, wherein, The buckets in adjacent rows are arranged in a staggered manner.
6. The inline chemical injection apparatus of claim 1, wherein, The amount of feed and the amount of medicine added in the first mixing cavity and the second mixing cavity are equal respectively each time.
7. The inline chemical feeder of claim 1 wherein, The bottom of the mixing cavity is inclined downward from one end of the premixing barrel to the partition plate, so that the bottom center of the premixing barrel is the lowest point, and the first discharging pipe and the second discharging pipe are arranged close to the partition plate.
8. The inline chemical feeder of claim 1 wherein, Valves for independently controlling the liquid paths are arranged on the first discharging pipe, the second discharging pipe, the first material distribution pipe, the second material distribution pipe, the first medicine adding pipe and the second medicine adding pipe respectively; The first medicine adding pipe and the second medicine adding pipe are communicated with a lye tank respectively; The upper end of the first material distribution pipe and the upper end of the second material distribution pipe are connected with a feeding pipe through a three-way pipe, and the feeding pipe is communicated with a naphtha conveying pipeline.