An online sampling system

Abstract

An online sampling system comprises a first sampling pipe, an expansion tank, the first sampling pipe is used for being fixed on equipment or pipeline, and an upstream end extends into medium, a downstream end of the first sampling pipe is connected with the expansion tank through a two-position valve, a first valve is arranged between the first sampling pipe and the two-position valve, a third interface of the two-position valve forms a waste outlet, a top of the expansion tank is provided with an exhaust port, and opening and closing are controlled through a second valve, the top of the expansion tank is connected with a negative pressure source through a third valve, a side wall of the expansion tank is connected with a first interface of a four-way joint through a fourth valve, a second interface of the four-way joint is upward, forms a gas phase sampling port, and a fourth interface of the four-way joint is downward, forms a liquid phase sampling port. The utility model discloses simple structure, convenient and safe operation, and can realize online continuous sampling.

Description

Technical Field

[0001] This utility model relates to the chemical industry, and in particular to an online sampling system. Background Technology

[0002] In the chemical industry, media sampling is typically done manually or intermittently mechanically, requiring on-site worker operation. This is unfavorable and inconvenient for multiple samplings at the same time or across different time periods, as it would otherwise require significant manpower and time. Furthermore, if the media within the equipment or pipelines are toxic, corrosive, or other hazardous chemicals, the safety risks to on-site personnel will be greatly increased.

[0003] Therefore, how to design a simple, safe and reliable online sampling system is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an online sampling system that is simple in structure, convenient and safe to operate, and capable of continuous online sampling.

[0005] The technical solution of this utility model is: an online sampling system, including a first sampling tube and an expansion tank. The first sampling tube is used to fix itself on equipment or pipeline, and its upstream end extends into the medium. The downstream end of the first sampling tube is connected to the expansion tank via a two-position valve. A first valve is provided between the first sampling tube and the two-position valve. The third port of the two-position valve forms a waste discharge port. An exhaust port is provided on the top of the expansion tank, and its opening and closing are controlled by a second valve. The top of the expansion tank is connected to a negative pressure source via a third valve. The side wall of the expansion tank is connected to the first port of a four-way valve via a fourth valve. The second port of the four-way valve faces upward to form a gas phase sampling port, and the fourth port of the four-way valve faces downward to form a liquid phase sampling port.

[0006] The first sampling tube includes a connecting tube, a fixed sleeve, and an adjusting tube. The connecting tube and the adjusting tube are threaded to both ends of the fixed sleeve to form the downstream end and the upstream end of the first sampling tube.

[0007] A connecting flange is provided at the downstream end of the connecting pipe, and the upstream end of the regulating pipe has a 45° sharp angle.

[0008] A fifth valve is installed on the pipeline between the third valve and the negative pressure source. A first connecting pipe is installed on this pipeline, which is connected to the cleaning water source / purging air source, and a sixth valve is installed to control its opening and closing.

[0009] The third port of the four-way valve forms a second connecting pipe, which is connected to the cleaning water source / purging air source, and a seventh valve is provided to control its opening and closing.

[0010] The gas phase sampling port of the four-way valve is equipped with an eighth valve to control its opening and closing, and the liquid phase sampling port of the four-way valve is equipped with a ninth valve to control its opening and closing.

[0011] The expansion tank is equipped with a safety valve, a level gauge, and a pressure transmitter.

[0012] The above technical solution has the following beneficial effects; 1. The online sampling system includes a first sampling tube and an expansion tank. The first sampling tube is used to extract media from equipment or pipelines, and the expansion tank is used to temporarily store the extracted media and release media pressure to ensure sampling safety. The first sampling tube is fixed to the equipment or pipeline, with its upstream end extending into the media. The downstream end of the first sampling tube is connected to the expansion tank via a two-position valve. A first valve is installed between the first sampling tube and the two-position valve. The third port of the two-position valve forms a waste discharge port. The media in the equipment or pipeline can enter the expansion tank through the first valve and the two-position valve, and residual media in the expansion tank can also be discharged through the third port of the two-position valve. The top of the expansion tank is provided with an exhaust port, which is controlled by a second valve. The top of the expansion tank is connected to a negative pressure source via a third valve. The negative pressure source evacuates the expansion tank, and by controlling the first valve, the time and timing of media extraction can be controlled, enabling multiple samplings at the same time or multiple samplings at different time periods. The side wall of the expansion tank is connected to the first port of a four-way valve via a fourth valve. The second port of the four-way valve faces upward, forming a gas phase sampling port, and the fourth port faces downward, forming a liquid phase sampling port. By opening the fourth valve, the medium in the expansion tank is discharged through the second port (gas phase) or the fourth port (liquid phase) of the four-way valve. It can be applied in petrochemical, chemical, pharmaceutical chemical, and fine chemical industries. It is mainly used for continuous online automatic sampling of the medium inside equipment or pipelines. It is suitable for general gaseous and liquid media, and is also suitable for sampling hazardous media.

[0013] 2. The first sampling tube includes a connecting tube, a fixed sleeve, and an adjusting tube. The connecting tube and the adjusting tube are threaded to both ends of the fixed sleeve to form the downstream end and upstream end of the first sampling tube, so that the depth of the adjusting tube in the equipment or pipeline can be adjusted to meet the actual sampling requirements.

[0014] 3. A fifth valve is installed on the pipeline between the third valve and the negative pressure source. A first connecting pipe is installed on this pipeline, connecting it to the cleaning water / purge air source, and a sixth valve controls its opening and closing. The third port of the four-way valve forms a second connecting pipe, connected to the cleaning water / purge air source, and a seventh valve controls its opening and closing. After sampling is completed, by closing or opening the corresponding valves and introducing pressurized water or air into the sampling system through the first and second connecting pipes, the remaining medium in the sampling system is discharged through the third port of the two-position valve, achieving cleaning, avoiding medium residue, ensuring the stability of the sampling system, and ensuring sampling accuracy.

[0015] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. Attached Figure Description

[0016] Figure 1 This is a connection diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the first sampling tube of this utility model.

[0017] In the attached diagram, 1 is the first sampling tube, 101 is the connecting tube, 102 is the fixed sleeve, 103 is the regulating tube, 2 is the expansion tank, 3 is the two-position valve, 4 is the waste discharge port, 5 is the exhaust port, 6 is the negative pressure source, 7 is the four-way valve, 8 is the gas phase sampling port, 9 is the liquid phase sampling port, 10 is the connecting flange, 11 is the first connecting tube, 12 is the second connecting tube, 13 is the pressure transmitter, 14 is the level gauge, a is the first valve, b is the second valve, c is the third valve, d is the fourth valve, e is the fifth valve, f is the sixth valve, g is the seventh valve, h is the eighth valve, and i is the ninth valve. Detailed Implementation

[0018] See Figure 1 and Figure 2This is a specific embodiment of an online sampling system. The online sampling system includes a first sampling tube 1 and an expansion tank 2. To facilitate observation of the liquid level in the expansion tank and ensure its safety, the expansion tank 2 is equipped with a safety valve, a pressure transmitter 13, and a level gauge 14. The first sampling tube 1 is used to fix itself to equipment or pipelines, and its upstream end extends into the medium. In this embodiment, the first sampling tube 1 includes a connecting pipe 101, a fixing sleeve 102, and an adjusting pipe 103. The connecting pipe 101 and the adjusting pipe 103 are threaded to both ends of the fixing sleeve 102, forming the downstream end and upstream end of the first sampling tube, respectively. A connecting flange 10 is provided at the downstream end of the connecting pipe 101, and the upstream end of the adjusting pipe 103 has a 45° sharp angle. The first sampling tube is fixed to the equipment or pipeline through the connecting flange 10, so that the connecting pipe, fixing sleeve, and adjusting pipe are all located inside the equipment or pipeline, making the extension length of the upstream end of the first sampling tube adjustable and improving sampling adaptability. The downstream end of the first sampling tube 1 is connected to the expansion tank 2 via a two-position valve 3. Obviously, the expansion tank is positioned above the first sampling tube, and a first valve a (usually a ball valve) is installed between the first sampling tube 1 and the two-position valve 3. The third port of the two-position valve 3 forms a waste discharge port 4. An exhaust port 5 is provided at the top of the expansion tank 2, and its opening and closing are controlled by a second valve b (which can be a regulating valve). The top of the expansion tank 2 is connected to a negative pressure source 6 via a third valve c (usually a ball valve). In this embodiment, a fifth valve e (a regulating valve) is installed on the pipe between the third valve c and the negative pressure source 6. This fifth valve is also a regulating valve. A first connecting pipe 11 is installed on this pipe, connecting to a cleaning water / purge air source, and a sixth valve f (a regulating valve) is installed to control its opening and closing. The side wall of the expansion tank 2 is connected to the first port of a four-way valve 7 via the fourth valve d. The fourth valve is a switch valve, and the second port of the four-way valve 7 faces upward to form a gas phase sampling port 8. The fourth port of the four-way valve 7 faces downward to form a liquid phase sampling port 9. In this embodiment, the third port of the four-way valve 7 forms a second connecting pipe 12, which is connected to the cleaning water source / purge air source. A seventh valve g is set to control its opening and closing. The seventh valve is a regulating valve. The gas phase sampling port 8 of the four-way valve 7 is set to be controlled by an eighth valve h, and the liquid phase sampling port 9 of the four-way valve is set to be controlled by a ninth valve i. Both the eighth and ninth valves are ball valves.

[0019] To improve ease of use, the two-position valve, level gauge, pressure transmitter, sixth valve, fifth valve, on / off valve, and seventh valve can be electrically connected to the central control room to achieve interlocking.

[0020] The working principle of this utility model is as follows: Based on the liquid level of the medium, adjust the length of the first sampling tube, install the first sampling tube into the equipment or pipeline, and fix it with a connecting flange, extending the regulating tube into the medium. Connect the first and second ports of the two-position valve, turn on the negative pressure source, and simultaneously open the first, third, and fifth valves. Utilize the negative pressure to draw the medium into the expansion tank. Control the fifth valve to achieve online sampling. Open the switching valve. Depending on the type of medium, if it is a gaseous medium, open the eighth and ninth valves, and transport the gaseous medium to the supporting equipment through the second port of the four-way valve; if it is a liquid medium, open the eighth and ninth valves, and transport the liquid medium to the supporting equipment through the fourth port of the four-way valve. After sampling, close the eighth, ninth, fifth, and first valves. Connect the second and third ports of the two-position valve, and open the sixth and seventh valves. Use a water or gas source to force the remaining medium to drain through the third port of the two-position valve.

Claims

1. An online sampling system, characterized in that: Includes the first sampling tube (1) and the expansion tank (2). The first sampling tube (1) is used to be fixed on the equipment or pipeline, and its upstream end extends into the medium. The downstream end of the first sampling tube (1) is connected to the expansion tank (2) via a two-position valve (3). A first valve (a) is provided between the first sampling tube (1) and the two-position valve (3). The third interface of the two-position valve (3) forms a waste discharge port (4). The expansion tank (2) is provided with an exhaust port (5) at the top, and its opening and closing are controlled by a second valve (b). The top of the expansion tank (2) is connected to a negative pressure source (6) via a third valve (c). The side wall of the expansion tank (2) is connected to the first interface of a four-way valve (7) via a fourth valve (d). The second interface of the four-way valve (7) faces upward to form a gas phase sampling port (8), and the fourth interface of the four-way valve (7) faces downward to form a liquid phase sampling port (9).

2. The online sampling system according to claim 1, characterized in that: The first sampling tube (1) includes a connecting tube (101), a fixed sleeve (102), and an adjusting tube (103). The connecting tube (101) and the adjusting tube (103) are threaded onto both ends of the fixed sleeve (102) to form the downstream end and the upstream end of the first sampling tube.

3. The online sampling system according to claim 2, characterized in that: The downstream end of the connecting pipe (101) is provided with a connecting flange (10), and the upstream end of the regulating pipe (103) has a 45° sharp angle.

4. The online sampling system according to claim 1, characterized in that: A fifth valve (e) is installed on the pipeline between the third valve (c) and the negative pressure source (6). A first connecting pipe (11) is installed on the pipeline, which is connected to the cleaning water source / purging air source, and a sixth valve (f) is installed to control its opening and closing.

5. The online sampling system according to claim 1, characterized in that: The third interface of the four-way (7) forms a second connecting pipe (12), which is connected to the cleaning water source / purging air source, and is equipped with a seventh valve (g) to control its opening and closing.

6. The online sampling system according to claim 1, characterized in that: The gas sampling port (8) of the four-way (7) is equipped with an eighth valve (h) to control its opening and closing, and the liquid sampling port (9) of the four-way is equipped with a ninth valve (i) to control its opening and closing.

7. The online sampling system according to claim 1, characterized in that: The expansion tank (2) is equipped with a safety valve, a level gauge (14), and a pressure transmitter (13).

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