CN211716247U - Low-pressure gas constant-current device - Google Patents

Abstract

The utility model discloses a low-pressure gas constant flow device, which comprises a system gas tank, the system gas tank is connected to one side of a first container tank through a first connecting pipeline, a stop valve is arranged on the first connecting pipeline, and the first container The bottom of the tank is connected with the bottom of the second container tank through the second connection pipe, the first container tank and the second container tank are provided with an appropriate amount of liquid, the side of the first container tank is connected with the side surface of the second container tank through the third connection pipe, the second tank tank is The top of the container tank is connected with the pre-processing device through the fourth connection pipeline, and the pre-processing device is connected with the analytical instrument; the utility model not only ensures the constant air flow of the online gas analyzer, reduces the influence of the fluctuation of the gas source on the analytical instrument, but also has the advantages of gas The water washing function can clean and cool the gas, reduce the load of the pretreatment device, and also has a simple structure, convenient material acquisition, low cost and easy maintenance.

Description

A low pressure gas constant flow device

technical field

The utility model relates to the technical field of gas analysis, in particular to a low-pressure gas constant flow device.

Background technique

On-line gas analyzers are the eyes and ears of operators in chemical production. The instability of the gas source entering the analyzer will affect the stability and reliability of the on-line analyzer measurement, which will lead to misoperation by the operator, and the lesser ones will affect the process stability of the production device. In severe cases, it will lead to damage to process equipment and environmental pollution accidents. Therefore, the stability and reliability of the online analyzer measurement are very important, and whether the gas source can enter the analyzer continuously and constantly is even more important.

At present, most gas measurement devices on the market are not equipped with corresponding gas constant flow devices. They mainly rely on the manual shut-off valve before entering the analyzer preprocessing device to adjust the size of the inlet gas source, which lacks flexibility. The stability of gas flow cannot be guaranteed, which affects the stability and reliability of the measurement of the online analyzer. Although there are very few online gas analyzers equipped with constant flow devices, they are all composed of regulating valves, pressure sensors and PLCs. A control loop can ensure the constant current output of the gas. Although this device can ensure the constant current output of the gas, the input cost is high, and the production site environment is complex, which is easy to cause corrosion to electronic components, resulting in frequent failures, thereby affecting Stability and reliability of online analyzer measurements.

Therefore, it is necessary to design a low-pressure gas constant flow device to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of this utility model is to overcome the above-mentioned deficiencies, and to provide a low-pressure gas constant flow device, which not only solves the problem that the instability of the system gas in the daily production process affects the analysis instrument, but also has a simple structure, convenient material selection, low cost, and convenient maintain.

In order to solve the above-mentioned technical problems, the technical scheme adopted by the utility model is: a low-pressure gas constant flow device, comprising a system gas tank, the system gas tank is connected to one side of the first container tank through a first connecting pipeline, A connecting pipe is provided with a stop valve, the bottom of the first container is connected to the bottom of the second container through the second connecting pipe, the first container and the second container are provided with an appropriate amount of liquid, and the side of the first container passes through the third container. The connecting pipeline is connected with the side of the second container tank, the top of the second container tank is connected with the preprocessing device through the fourth connecting pipeline, and the preprocessing device is connected with the analytical instrument.

Preferably, the first container tank, the second container tank and each connecting pipeline are detachably connected.

Preferably, the connections between the first container can, the second container can and each connecting pipeline are sealed with a wire mouth type sealing cover.

Preferably, the liquid in the first container tank and the second container tank is water.

The beneficial effects of the present utility model:

1. Ensure the constant air flow of the online gas analyzer and reduce the impact of gas source fluctuations on the analyzer;

2. The device has the function of gas washing, which can clean and cool the gas and reduce the load of the pretreatment device;

3. The device has the advantages of simple structure, convenient material acquisition, low cost and easy maintenance.

Description of drawings

Figure 1 is a schematic structural diagram of a low-pressure gas constant-current device;

In the figure, the system gas tank 1, the first connecting pipeline 2, the first container tank 3, the stop valve 4, the second connecting pipeline 5, the second container tank 6, the third connecting pipeline 7, the fourth connecting pipeline 8, the pretreatment The device 9 and the analytical instrument 10 .

Detailed ways

The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , a low-pressure gas constant flow device includes a system gas tank 1, the system gas tank 1 is connected to one side of a first container tank 3 through a first connecting pipe 2, and the first connecting pipe 2 is provided with There is a stop valve 4, the bottom of the first container tank 3 is connected with the bottom of the second container tank 6 through the second connecting pipe 5, the first container tank 3 and the second container tank 6 are provided with an appropriate amount of liquid, and the side of the first container tank 3 passes through. The third connecting pipeline 7 is connected to the side of the second container tank 6 , and the top of the second container tank 6 is connected to the preprocessing device 9 through the fourth connecting pipeline 8 , and the preprocessing device 9 is connected to the analytical instrument 10 .

Preferably, the first container tank 3, the second container tank 6 and each connecting pipeline are detachably connected. Such a setup facilitates routine cleaning and maintenance.

Preferably, the connection between the first container tank 3, the second container tank 6 and each connecting pipeline is sealed with a wire mouth type sealing cover. Such a setup facilitates routine cleaning and maintenance.

Preferably, the liquid in the first container tank 3 and the second container tank 6 is water. Such an arrangement has a gas water washing function, which can clean and cool the gas and reduce the load of the pretreatment device 9 .

In this embodiment, the analytical instrument 10 adopts an on-line gas analyzer, and the pretreatment device 9 adopts a VOC pretreatment box. Water is used as the liquid in the first container tank 3 and the second container tank 6 . The shut-off valve 4 is fully open, which reduces the risk that impurities in the gas are easy to accumulate and block the valve because the valve is not fully opened and the gas flow rate is slow, ensuring that normal production is not affected.

The working principle of this embodiment is as follows: the process gas in the system gas tank 1 enters the first container tank 3 through the shut-off valve 4, and when the pressure in the first container tank 3 reaches saturation, the air pressure will be higher than the water at the level of the third connecting pipe 7 Pressed into the second container tank 6, the process gas is filled with the third connecting pipe 7 and then enters the pretreatment device 9 through the fourth connecting pipe 8 at the top of the second container tank 6. The height of the liquid level in the second container tank 6 is related to the system air pressure. is proportional to, thereby ensuring that the gas source flow into the analytical instrument 10 is constant. When the pressure of the system gas tank 1 rises, the process gas in the system gas tank 1 enters the first container tank 3 through the shut-off valve 4, and the gas flow rate through the third connection pipe 7 increases. When the gas flow rate through the third connection pipe 7 exceeds After the upper limit of the flow rate of the third connecting pipe 7, the water in the first container tank 3 will be completely pressed into the second container tank 6 through the second connecting pipe 5. At this time, the water in the second container tank 6 will form a liquid seal. The gas enters the pretreatment device 9 from the third connecting pipe 7 through the second container tank 6 through liquid sealing, and the outlet of the pretreatment device 9 is connected to the analytical instrument 10 . The first container tank 3 and the second container tank 6 form a communication device, the inlet pressure of the first container tank 3 increases or decreases, and the liquid level in the second container tank 6 increases or decreases accordingly, ensuring that the second container tank 6 The outlet gas flow is constant, so as to ensure that the gas flow into the analytical instrument 10 is constant.

The utility model not only ensures the constant air flow of the on-line gas analyzer and reduces the influence of the fluctuation of the gas source on the analyzer, but also has the function of gas washing, which can clean and cool the gas, reduce the load of the pretreatment device, and has a simple structure and can be made of materials. Convenience, low cost and easy maintenance.

The above-mentioned embodiments are only the preferred technical solutions of the present invention, and should not be regarded as limitations of the present invention. The embodiments and features in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present utility model shall take the technical solutions described in the claims, including the equivalent alternatives of the technical features in the technical solutions described in the claims, as the protection scope. That is, equivalent replacements and improvements within this scope are also within the protection scope of the present invention.

Claims (4)

1. A low-pressure gas constant-flow device comprises a system gas tank (1), and is characterized in that: the system gas tank (1) is connected with one side of the first container tank (3) through the first connecting pipeline (2), the stop valve (4) is arranged on the first connecting pipeline (2), the bottom of the first container tank (3) is connected with the bottom of the second container tank (6) through the second connecting pipeline (5), a proper amount of liquid is arranged in the first container tank (3) and the second container tank (6), the side of the first container tank (3) is connected with the side of the second container tank (6) through the third connecting pipeline (7), the top of the second container tank (6) is connected with the pretreatment device (9) through the fourth connecting pipeline (8), and the pretreatment device (9) is connected with the analytical instrument (10).

2. A low-pressure gas constant flow device according to claim 1, wherein: the first container tank (3), the second container tank (6) and each connecting pipeline are detachably connected.

3. A low-pressure gas constant flow device according to claim 2, wherein: the joints of the first container tank (3), the second container tank (6) and each connecting pipeline are sealed by sealing covers with screw threads.

4. A low-pressure gas constant flow device according to claim 1, wherein: the liquid in the first container tank (3) and the second container tank (6) is water.

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