Online vacuum sampling device for reaction kettle

Abstract

The utility model discloses an on-line vacuum sampling device for a reaction kettle, which comprises a sampling pipe, a flow cell, a main stop valve, a sampling valve, a sampling sight glass, a vacuum valve and a nitrogen valve, the upper end of the sampling pipe is connected with the lower end of the flow cell, and the side part of the flow cell is connected with an on-line PH meter and / or an on-line conductivity meter. The upper end of the flow cell is connected with the lower end of the main stop valve, the upper end of the main stop valve is connected with the lower end of the sampling sight glass, the vacuum valve and the nitrogen valve are respectively connected with the upper end of the sampling sight glass in parallel, and the sampling valve is connected on a pipeline between the main stop valve and the sampling sight glass. The flow cell is arranged, an online PH meter and / or an online conductivity meter can be installed, and online measurement can be achieved; the nitrogen is used for providing power for liquid to enter the sampling bottle instead of an existing gravity mode, so that part of complex pipelines are saved; the sampling valve is used for sampling instead of an existing bypass mode, so that part of pipelines are reduced, and cleaning dead angles are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of reaction kettles, and particularly relates to an on-line vacuum sampling device for a reaction kettle. Background Art

[0002] In industries such as chemical engineering, pharmaceuticals, and food, reaction kettles are used as reaction containers or devices. In order to detect the reaction degree in the reaction kettle and judge the reaction end point, sampling and analysis are required during the production process. There are generally two sampling methods. One is the traditional direct sampling from the sampling ports left at the upper or lower part of the reaction kettle, and the other is sampling using the vacuum principle. The existing vacuum sampling device (also called a vacuum sampler) of a reaction kettle has a relatively complex structure and a large processing difficulty; during sampling, after closing the vacuum, a sampling bottle is connected to a sampling sight glass and flows into the sampling bottle by gravity, which increases the connecting pipeline, has a complex design, and a high failure rate; moreover, it is difficult to measure the PH and / or conductivity of the sample during the sampling process. Content of the Utility Model

[0003] Therefore, the utility model provides an on-line vacuum sampling device for a reaction kettle to solve one or more of the technical problems such as the complex structure of the existing vacuum sampler, relatively more connecting pipelines, and inability to measure PH and / or conductivity online.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] An on-line vacuum sampling device for a reaction kettle includes a sampling pipe, a flow-through cell, a main cut-off valve, a sampling valve, a sampling sight glass, a vacuum valve, and a nitrogen valve. The upper end of the sampling pipe is connected to the lower end of the flow-through cell. An on-line PH meter and / or an on-line conductivity meter are connected to the side of the flow-through cell. The upper end of the flow-through cell is connected to the lower end of the main cut-off valve. The upper end of the main cut-off valve is connected to the lower end of the sampling sight glass. The vacuum valve and the nitrogen valve are respectively connected to the upper end of the sampling sight glass in a parallel manner. The sampling valve is connected to the pipeline between the main cut-off valve and the sampling sight glass.

[0006] Further, the on-line vacuum sampling device further includes a connecting flange, and the connecting flange is arranged on the periphery of the sampling pipe.

[0007] Further, the flow-through cell includes a cell body, and a communication cavity is arranged in the cell body. The cross-sectional area of the communication cavity is larger than the cross-sectional area of the sampling pipe.

[0008] Further, a temporary storage cavity is arranged inside the sampling sight glass. The lower port and the upper port of the temporary storage cavity are both in a flared shape and the large ends of the two flares face each other. A floating ball is arranged in the temporary storage cavity, and the diameter of the floating ball is adapted to the inner diameter of the temporary storage cavity.

[0009] Furthermore, the main cut-off valve, sampling valve, vacuum valve, and nitrogen valve are all automatic control valves.

[0010] The utility model has the following advantages:

[0011] A flow cell is configured, which can install an online pH meter and / or an online conductivity meter to enable online measurement; nitrogen is used to provide the power for the liquid to enter the sampling bottle instead of the existing gravity method, saving some complex pipelines; a sampling valve is used for sampling instead of the existing bypass method, reducing some pipelines and eliminating cleaning dead ends.

[0012] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and those of ordinary skill in the art can also obtain other implementation drawings according to the provided drawings without creative efforts.

[0014] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not intended to limit the limiting conditions for the implementation of the present utility model. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the efficacy that the present utility model can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0015] Figure 1 FIG. 1 is a schematic structural diagram of an on-line vacuum sampling device for a reaction kettle provided by an embodiment of the present utility model.

[0016] In the figure: 1 - connecting flange, 2 - sampling pipe, 3 - flow cell, 4 - main cut-off valve, 5 - sampling valve, 6 - sampling sight glass, 7 - vacuum valve, 8 - nitrogen valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature and not restrictive.

[0018] As shown in the figure, this embodiment provides an on-line vacuum sampling device for a reaction kettle, which includes a sampling pipe 2, a flow-through cell 3, a main cut-off valve 4, a sampling valve 5, a sampling sight glass 6, a vacuum valve 7 and a nitrogen valve 8. The upper end of the sampling pipe 2 is connected to the lower end of the flow-through cell 3. An on-line pH meter and / or an on-line conductivity meter are connected to the side of the flow-through cell 3. The upper end of the flow-through cell 3 is connected to the lower end of the main cut-off valve 4. The upper end of the main cut-off valve 4 is connected to the lower end of the sampling sight glass 6. The vacuum valve 7 and the nitrogen valve 8 are respectively connected to the upper end of the sampling sight glass 6 in a parallel manner. The sampling valve 5 is connected to the pipeline between the main cut-off valve 4 and the sampling sight glass 6.

[0019] It should be noted that the above "connection" is a broad connection, including direct connection, indirect connection, and connection and communication. In this embodiment, the sampling pipe 2 communicates with the flow-through cell 3, the flow-through cell 3 communicates with the main cut-off valve 4, the main cut-off valve 4 communicates with the sampling sight glass 6, the vacuum valve 7 and the nitrogen valve 8 respectively communicate with the sampling sight glass 6, and the sampling valve 5 communicates with the "pipeline between the main cut-off valve 4 and the sampling sight glass 6". The probe of the on-line pH meter and / or the on-line conductivity meter is located inside the flow-through cell 3, and the display part or the data transmission part is outside the flow-through cell 3. Among them, the data transmission part can be connected to the control end (referring to the controller or control circuit board of the reaction kettle) through a data line.

[0020] By adopting the above technical solution, a flow-through cell 3 is configured for the sampling device, which can install an on-line pH meter and / or an on-line conductivity meter to achieve on-line measurement. After the nitrogen valve 8 is opened, nitrogen presses the liquid buffered or temporarily stored in the sampling sight glass 6 into the sampling valve 5, and flows into the sampling bottle (or called sampling container) from the opened sampling valve 5. In this way, nitrogen is used to provide the power for the liquid to enter the sampling bottle, rather than the existing gravity-dependent method, saving some complex pipelines. The sampling valve 5 is used for sampling, rather than the existing bypass method, reducing some pipelines and also being able to eliminate the cleaning dead corners.

[0021] In this embodiment, the on-line vacuum sampling device further includes a connecting flange 1, and the connecting flange 1 is arranged on the periphery of the sampling pipe 2. The connecting flange 1 is used to connect with the flange of the sampling port of the reaction kettle, so that the sampling device can be fixed to the reaction kettle through the connecting flange 1. After installation, the lower end of the sampling pipe 2 should extend below the liquid level in the reaction kettle to ensure sampling, so the sampling pipe 2 has a certain length.

[0022] The flow cell 3 is a closed container for installing an on-line pH meter and / or an on-line conductivity meter. In this embodiment, the flow cell 3 includes a cell body provided with a communication cavity inside. The top of the cell body is provided with a liquid outlet for connecting to the main cut-off valve 4, the bottom of the cell body is provided with a liquid inlet for connecting to the sampling pipe 2, and an installation port for installing the on-line pH meter and / or the on-line conductivity meter is provided on the side of the cell body. The liquid outlet, the liquid inlet and the installation port are all communicated with the communication cavity. The flow area of the communication cavity is larger than that of the sampling pipe 2. Generally, the flow area of the communication cavity is the sum of the flow area of the sampling pipe 2 and the area of the probe of the on-line pH meter or the probe of the on-line conductivity meter, so as to prevent the probe in the communication cavity from obstructing the liquid flow.

[0023] In this embodiment, a temporary storage cavity is provided inside the sampling sight glass 6. The lower port and the upper port of the temporary storage cavity are both flared and the large ends of the two flares face each other. A floating ball is provided in the temporary storage cavity, and the diameter of the floating ball is adapted to the inner diameter of the temporary storage cavity. After evacuation, the liquid enters the temporary storage cavity from below, and the liquid drives the floating ball to move upward until the floating ball abuts against the upper flare. The floating ball cannot move upward continuously, and relies on the floating ball to block the upper flare to prevent the liquid from entering the upper evacuated pipeline. During sampling, nitrogen gas pushes the floating ball downward, and the floating ball pushes the liquid into the sampling valve 5 and then discharges it into the sampling bottle.

[0024] In this embodiment, the main cut-off valve 4, the sampling valve 5, the vacuum valve 7 and the nitrogen valve 8 are all automatic control valves. The main cut-off valve 4 is used to automatically connect or disconnect the sampling device from the reaction kettle. The sampling valve 5 is used to automatically sample the liquid into the sampling bottle. The vacuum valve 7 is used to automatically open and close the vacuum pipeline. The nitrogen valve 8 is used to automatically open and close the nitrogen pipeline or the cleaning water pipeline, with a high degree of automation.

[0025] The sampling principle is as follows:

[0026] The sampling device is installed on the top of the reaction kettle and is connected to the sampling port of the reaction kettle through the connecting flange 1. The sampling pipe 2 is inserted below the liquid level of the reaction kettle. During sampling, the vacuum valve 7 is opened and waited for a set time to make a certain vacuum degree reached inside the sampling sight glass 6. The main cut-off valve 4 is opened and waited for a set time to make a certain liquid level reached inside the sampling sight glass 6. During this process, the pH and / or conductivity of the material can be recorded by the on-line pH meter and / or the on-line conductivity meter inserted on the flow cell 3. The main cut-off valve 4 is closed, and the vacuum valve 7 is closed. The nitrogen valve 8 is opened, the sampling valve 5 is opened, and nitrogen gas pushes the liquid inside the sampling sight glass 6 through the sampling valve 5 into the sampling bottle. After sampling is completed, the sampling valve 5 is closed, the main cut-off valve 4 is opened to press the remaining liquid back into the reaction kettle. The main cut-off valve 4 is closed to complete one sampling.

[0027] In the description of this specification, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These 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, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0029] In this application, unless otherwise clearly specified and defined, terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal connection or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0031] The foregoing disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0032] As described above, the foregoing is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various changes or substitutions, and these should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An online vacuum sampling device for a reactor, characterized in that: It includes a sampling tube, a circulation pool, a main shut-off valve, a sampling valve, a sampling sight glass, a vacuum valve and a nitrogen valve. The upper end of the sampling tube is connected to the lower end of the circulation pool. The side of the circulation pool is connected with an online pH meter and / or an online conductivity meter. The upper end of the circulation pool is connected to the lower end of the main shut-off valve. The upper end of the main shut-off valve is connected to the lower end of the sampling sight glass. The vacuum valve and the nitrogen valve are respectively connected to the upper end of the sampling sight glass in parallel. The sampling valve is connected to the pipeline between the main shut-off valve and the sampling sight glass.

2. The online vacuum sampling device for a reactor according to claim 1, characterized in that: The online vacuum sampling device further comprises a connecting flange, and the connecting flange is arranged on the peripheral side of the sampling tube.

3. The online vacuum sampling device for a reactor according to claim 1, characterized in that: The circulation pool comprises a pool body, a connecting cavity is arranged in the pool body, and the flow area of ​​the connecting cavity is larger than the flow area of ​​the sampling tube.

4. The online vacuum sampling device for a reactor according to claim 1, characterized in that: A temporary storage chamber is provided inside the sampling mirror, the lower port and the upper port of the temporary storage chamber are both in a trumpet shape and the large ends of the two trumpets are arranged facing each other, a floating ball is provided in the temporary storage chamber, and the ball diameter of the floating ball is adapted to the inner diameter of the temporary storage chamber.

5. The online vacuum sampling device for a reactor according to claim 1, characterized in that: The main shut-off valve, sampling valve, vacuum valve and nitrogen valve are all self-controlled valves.

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