Pretreatment device for online detection

Abstract

The application relates to the technical field of detection equipment, in particular to a pretreatment device for online detection, which comprises a protective sleeve, a sampling feed pipe and a filter head. The protective sleeve is arranged at the top of a slurry tank and extends into the slurry below the slurry surface by a certain distance, and a plurality of through holes are arranged in the circumferential direction of the part of the protective sleeve arranged in the slurry. The sampling feed pipe penetrates into the protective sleeve and is connected with a sampling detector. The filter head is arranged in the protective sleeve and in the slurry, and is connected with the sampling feed pipe. The pretreatment device provided by the application can continuously provide the online sampling detector with clear liquid meeting the requirements, can make the online sampling detector timely feedback the pollutant concentration in the phosphogypsum slurry and the like, and can further provide accurate data support for the chemical reagent adding amount in the resource chemical modification process of the phosphogypsum and the like.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and in particular to a pretreatment device for online testing. Background Technology

[0002] Phosphogypsum is a major industrial solid waste generated during the production of phosphoric acid. Studies show that approximately 4.5 to 5.0 tons of phosphogypsum are produced as a byproduct for every ton of phosphoric acid produced. The main chemical component of phosphogypsum is calcium sulfate dihydrate (CaSO4·2H2O), but associated pollutants such as soluble phosphates and fluorides are easily leached into the soil by rainwater, causing ecological problems. Chemical modification is considered a reliable and effective method for the resource utilization of phosphogypsum. The process principle involves using chemical agents to transform the soluble phosphates and fluorides in phosphogypsum into stable, insoluble chemical precipitates.

[0003] Online monitoring is an effective means of precisely controlling the amount of chemical reagents added during the chemical modification process of phosphogypsum resource recovery. However, the amount of chemical reagents added during the modification process has always been difficult to control precisely, relying on manual sampling and analysis as the basis for reagent addition for a long time. Manual sampling suffers from long analysis times and difficulty in timely response, leading to increased modification costs when adding too much, and unsatisfactory results when adding too little. Using online monitoring can reduce the labor intensity of personnel and enable timely response.

[0004] However, since phosphogypsum slurry is a liquid-solid mixture, it must undergo liquid-solid separation pretreatment before entering the online detector. However, current liquid-solid separation devices often experience clogging problems when applied to the online detection of phosphogypsum slurry, thus affecting the achievement of accurate real-time detection. Summary of the Invention

[0005] This application provides a pretreatment device for online detection, which solves the problem that liquid-solid separation devices cannot perform real-time and accurate detection due to blockage.

[0006] This application provides a preprocessing apparatus for online detection, comprising: A protective sleeve is provided at the top of the slurry tank and extends a certain distance below the surface of the slurry. The portion of the protective sleeve located inside the slurry has multiple through holes in its circumferential direction. A sampling feed tube extends through the protective sleeve and is connected to the sampling detector. A filter head is located inside the protective sleeve and within the slurry, and the filter head is connected to the sampling feed pipe.

[0007] In one possible design, a backwash pipe is also included, which is connected to the sampling feed pipe.

[0008] In one possible design, the backwash pipe is equipped with a backwash electric valve, and the backwash pipe is connected to a process water source or a compressed air source.

[0009] In one possible design, a sampling pump is provided between the sampling feed pipe and the sampling detector.

[0010] In one possible design, both the backwash electric valve and the sampling pump are electrically connected to the controller.

[0011] In one possible design, the slurry is a phosphogypsum slurry.

[0012] In one possible design, the filter head is provided with filter holes, the pore size of which is 400-500 mesh.

[0013] In one possible design, the end of the protective sleeve located within the phosphogypsum slurry is 300mm-400mm away from the surface of the phosphogypsum slurry.

[0014] In one possible design, multiple through holes are evenly distributed along the axial direction of the protective sleeve, and the diameter of the through holes is 50mm-80mm.

[0015] In one possible design, both the protective sleeve and the sampling feed tube are made of stainless steel.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: The pretreatment device provided in this application can continuously provide the online sampling and detection instrument with the required clear liquid, enabling the online sampling and detection instrument to promptly report the concentration of pollutants in slurries such as phosphogypsum slurry, thereby providing accurate data support for the amount of chemical agents added during the resource-based chemical modification process of phosphogypsum.

[0017] The pretreatment device provided in this application, through the rational design of the structure and connection relationship of the protective sleeve, sampling feed pipe, filter head, and backwash pipe, can prevent the device from clogging, thereby ensuring the real-time and accurate detection of the concentration of pollutants in slurries such as phosphogypsum slurry. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1This is a schematic diagram of the pretreatment device for online detection of phosphogypsum slurry provided in an embodiment of this application. Detailed Implementation

[0020] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The solid particles in phosphogypsum slurry are relatively small, typically ranging from 35 to 400 mesh. When using existing liquid-solid separation devices for online detection of phosphogypsum slurry, clogging problems frequently occur, affecting the accuracy of real-time detection of pollutant concentrations in the phosphogypsum slurry. Consequently, this affects the accuracy of chemical reagent addition during the chemical modification process of phosphogypsum resource utilization.

[0022] Therefore, this application provides a pretreatment device for online detection, which can be used for pretreatment of phosphogypsum slurry for online detection. In other embodiments, this pretreatment device can also be used for pretreatment of other slurries for online detection, which will not be exemplified here. Please refer to... Figure 1 Taking phosphogypsum slurry as an example, this application provides a pretreatment device for online detection of phosphogypsum slurry. The pretreatment device includes a protective sleeve 4, a sampling feed pipe 6, and a filter head 5. The protective sleeve 4 isolates most of the solid particles in the phosphogypsum slurry 1, allowing only trace amounts of solid particles and the clear liquid in the phosphogypsum slurry 1 to enter the protective sleeve 4. The filter head 5 filters out the trace amounts of solid particles entering the protective sleeve 4, allowing only the clear liquid in the protective sleeve 4 to enter the sampling feed pipe 6. The sampling feed pipe 6 delivers the clear liquid in the phosphogypsum slurry 1 to the sampling and analysis instrument 8 in the sampling and analysis cabin for real-time detection and analysis.

[0023] Specifically, the protective sleeve 4 is fixed to the top of the phosphogypsum slurry tank 2. The top of the protective sleeve 4 extends to the outside of the phosphogypsum slurry tank 2, while the bottom of the protective sleeve 4 extends a certain distance below the surface of the phosphogypsum slurry 1. Simultaneously, multiple through holes 41 are provided circumferentially at the bottom of the protective sleeve 4, i.e., the portion extending into the phosphogypsum slurry 1. In some embodiments, the distance between the end of the protective sleeve 4 within the phosphogypsum slurry 1 and the surface of the phosphogypsum slurry 1 is 300mm-400mm, to allow sufficient clear liquid to enter the protective sleeve 4. Furthermore, the multiple through holes 41 are uniformly arranged along the axial direction of the protective sleeve 4, and the diameter of the through holes 41 is 50mm-80mm. This isolates most of the solid particles in the phosphogypsum slurry 1 while preventing the solid particles in the phosphogypsum slurry 1 from clogging the through holes 41, thereby facilitating the smooth entry of clear liquid into the protective sleeve 4.

[0024] Specifically, the sampling feed pipe 6 penetrates into the protective sleeve 4. One end of the sampling feed pipe 6 extends into the clear liquid in the protective sleeve 4, while the other end of the sampling feed pipe 6 extends to the outside of the phosphogypsum slurry tank 2 and is connected to the sampling detector 8 through the sampling pump 7 and the sampling discharge pipe 9, so as to pump the clear liquid in the protective sleeve 4 into the sampling detector 8 for real-time monitoring of the pollutant concentration in the phosphogypsum slurry 1.

[0025] Specifically, the filter head 5 is located inside the clear liquid within the protective sleeve 4 and is fixed to the end of the sampling feed pipe 6. In some embodiments, the filter head 5 is provided with multiple filter holes, the pore size of which is in the range of 400-500 mesh, that is, the pore size of the filter holes is smaller than the particle size of the solid particles in the phosphogypsum slurry 1, which can effectively isolate the trace solid particles entering the protective sleeve 4 outside the sampling feed pipe 6.

[0026] In some embodiments, the pretreatment device further includes a backwash pipe 11, one end of which is connected to the sampling feed pipe 6 via a T-connector, and the other end of which is connected to a process water source or a compressed air source. Meanwhile, a backwash electric valve 10 is fixed on the backwash pipe 11 to facilitate the periodic rinsing of solid particles attached to the filter head 5, preventing solid particles from clogging the filter holes on the filter head 5 and the through holes 41 on the protective sleeve 4. This allows for the continuous supply of clean liquid to the online sampling and detection instrument 8, thereby ensuring the real-time and accurate detection of contaminant concentrations in the phosphogypsum slurry.

[0027] In some embodiments, both the backwash electric valve 10 and the sampling pump 7 are electrically connected to a controller (not shown) to facilitate automatic control of the sampling and detection cycle.

[0028] In some embodiments, the protective sleeve 4 and the sampling feed pipe 6 are both made of stainless steel to prevent the phosphogypsum slurry from corroding the protective sleeve 4 and the sampling feed pipe 6.

[0029] In some embodiments, an agitator 3 is fixedly installed on the phosphogypsum slurry tank 2 to prevent the phosphogypsum slurry 1 from settling and to facilitate the real-time replenishment of the clear liquid entering the protective sleeve 4, thereby facilitating the real-time and accurate detection of the contaminant concentration in the phosphogypsum slurry.

[0030] The working process of this utility model is as follows: When sampling pump 7 is turned on, phosphogypsum slurry 1 in phosphogypsum slurry tank 2 enters the protective sleeve 4 through the through hole 41 on the protective sleeve 4 in a timely manner. Under the filtration of filter head 5, the clear liquid enters the sampling feed pipe 6 and is sent to the sampling and detection instrument 8 for analysis through the sampling discharge pipe 9. The solid particles in phosphogypsum slurry 1 are trapped on the outside of the protective sleeve 4 and filter head 5. After sampling and testing are completed, the backwash electric valve 10 on backwash pipe 11 is automatically opened. Process water or compressed air enters the filter head 5 and protective sleeve 4 through sampling feed pipe 6 to backwash the filter head 5 and protective sleeve 4 to prevent the filter head 5 and protective sleeve 4 from being blocked. After rinsing, the next round of sampling is immediately started. This cycle is repeated to achieve efficient and accurate detection.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A pretreatment device for online detection, characterized in that, include: A protective sleeve is provided at the top of the slurry tank and extends a certain distance below the surface of the slurry. The portion of the protective sleeve located inside the slurry has multiple through holes in its circumferential direction. A sampling feed tube extends through the protective sleeve and is connected to the sampling detector. A filter head is located inside the protective sleeve and within the slurry, and the filter head is connected to the sampling feed pipe.

2. The pretreatment device for online detection according to claim 1, characterized in that, It also includes a backwash pipe, which is connected to the sampling feed pipe.

3. The pretreatment device for online detection according to claim 2, characterized in that, The backwash pipe is equipped with a backwash electric valve, and the backwash pipe is connected to a process water source or a compressed air source.

4. The pretreatment apparatus for online detection according to claim 3, characterized in that, A sampling pump is provided between the sampling feed pipe and the sampling detector.

5. The pretreatment apparatus for online detection according to claim 4, characterized in that, Both the backwash electric valve and the sampling pump are electrically connected to the controller.

6. The pretreatment apparatus for online detection according to any one of claims 1-5, characterized in that, The slurry is a phosphogypsum slurry.

7. The pretreatment apparatus for online detection according to claim 6, characterized in that, The filter head is provided with filter holes, and the pore size of the filter holes is 400-500 mesh.

8. The pretreatment apparatus for online detection according to claim 6, characterized in that, The distance between the end of the protective sleeve located in the phosphogypsum slurry and the surface of the phosphogypsum slurry is 300mm-400mm.

9. The pretreatment apparatus for online detection according to claim 6, characterized in that, The plurality of through holes are evenly distributed along the axial direction of the protective sleeve, and the diameter of the through holes is 50mm-80mm.

10. The pretreatment apparatus for online detection according to claim 6, characterized in that, Both the protective sleeve and the sampling feed tube are made of stainless steel.

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