Sampling probe

Abstract

The sampling probe is assembled in a flue with a built-in power source and comprises a return valve and a gas chamber defined by the interior of the return valve, a filter is installed in the gas chamber, the gas chamber is provided with a sample gas port and a return port which are communicated with the gas chamber, and the sample gas port and the return port are both communicated with the flue; the return valve is arranged at the joint of the return port and the gas chamber, and when the return valve is opened, the sample gas port, the gas chamber, the return port and the flue are connected to form a circulation loop. The gas chamber where the sample gas does not pass through and the gas chamber subjected to back flushing operation contain a large amount of air, when the return valve is opened, the power source arranged in the flue drives the sample gas to enter the gas chamber from the return port, the newly entering sample gas is mixed with the internal air and then returns to the flue through the sample gas port, and certain circulation time can be preset; and the step of detecting the sample gas can be entered. Through the arrangement, the influence on the sample gas can be eliminated, and the accuracy of a sample gas detection result is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas sampling of CEMS, and in particular relates to a sampling probe. Background Art

[0002] CEMS is a system used to monitor waste gas emissions during industrial production. It can monitor and record gas and particulate emission data from emission sources in real time. CEMS is mainly used to monitor atmospheric pollutant emissions from industrial enterprises, including sulfur dioxide, nitrogen oxides, particulate matter, etc., to ensure that corporate emissions meet environmental standards and regulatory requirements. CEMS is equipped with a sampling probe, which is at the forefront of the entire CEMS system. The normal operation of the sampling probe is directly related to the measurement accuracy and stability of the entire CEMS system.

[0003] When the sampling probe used in the related technology is first used, the internal air chamber is filled with air. If the sample gas to be tested enters the sampling probe directly from the flue, the air will affect the proportion of the content of various substances in the sample gas, affecting the accuracy of the sample gas detection, and the detection result has a large error. Secondly, as the sampling probe is used, the dirt in the air chamber will accumulate. The related technology usually injects compressed air into the air chamber to drive the internal dirt back to the flue. At this time, the air chamber is full of air, which affects the detection accuracy of the subsequent sample gas. Utility Model Content

[0004] The technical purpose of the utility model is to provide a sampling probe, aiming to solve the reasons for poor accuracy and large error in sample gas detection.

[0005] In order to solve the above technical problems, the utility model is implemented as follows: a sampling probe is installed in a flue with a built-in power source, comprising:

[0006] An air chamber is formed by internal enclosure, a filter is installed in the air chamber, a sample gas port and a return port are opened in the air chamber, and the sample gas port and the return port are both in communication with the flue;

[0007] The reflux valve is arranged at the connection between the reflux port and the air chamber. When the reflux valve is opened, the sample gas port, the air chamber, the reflux port and the flue are connected to form a circulation loop.

[0008] In some embodiments of the utility model, the sampling probe also includes an exhaust valve, the air chamber is also provided with an exhaust port connected thereto, the exhaust valve is arranged in the exhaust port, the sampling probe has a sampling state and a reflux state, when the sampling probe is in the sampling state, the exhaust valve is opened, the reflux valve is closed, the sample gas port, the air chamber and the exhaust port are connected in sequence to form a one-way sampling passage, when the sampling probe is in the reflux state, the exhaust valve is closed, and the reflux valve is opened.

[0009] In some embodiments of the present utility model, the sampling probe further comprises a stop valve and a calibration port, wherein the stop valve is arranged at the connection between the sample gas port and the gas chamber, and the calibration port is used to transmit the calibration gas into the gas chamber;

[0010] The sampling probe also has a calibration state. When the sampling probe is in the calibration state, the stop valve is closed, the reflux valve is closed, the exhaust valve is opened, and the calibration port, the air chamber and the exhaust port are connected to form a one-way calibration passage.

[0011] When the sampling probe is in the sampling state and the reflux state, the stop valve is opened.

[0012] In some embodiments of the present invention, the sampling probe further includes a valve body assembly, the valve body assembly includes the stop valve and a pneumatic actuator, and the pneumatic actuator includes a rotating shaft drivingly connected to the stop valve.

[0013] In some embodiments of the present invention, the stop valve is a ball valve.

[0014] In some embodiments of the present invention, the valve body assembly further includes a five-position three-way valve, which is connected to the pneumatic actuator and controls the gas input into the pneumatic actuator.

[0015] In some embodiments of the present invention, a heating element is provided around the outer peripheral wall of the air chamber.

[0016] In some embodiments of the present invention, a heat-insulating element is provided on the outer peripheral wall of the heating element.

[0017] Compared with the prior art, the sampling probe in the utility model has the following beneficial effects:

[0018] The present application proposes a sampling probe, which is installed in a flue with a built-in power source, including a reflux valve and an air chamber formed by an internal enclosure, a filter is installed in the air chamber, and the air chamber is provided with a sample gas port and a reflux port connected thereto, and both the sample gas port and the reflux port are connected to the flue; the reflux valve is arranged at the connection between the reflux port and the air chamber, and when the reflux valve is opened, the sample gas port, the air chamber, the reflux port and the flue are connected to form a circulation loop. The air chamber that has not passed the sample gas and the air chamber after the backwash operation both contain a large amount of air. When the reflux valve is opened, the power source built into the flue drives the sample gas to enter the air chamber from the reflux port, and the newly entered sample gas is mixed with the internal air and then returns to the flue through the sample gas port. A certain cycle time can be preset, and when the internal and external sample gas contents are balanced, the sample gas detection step can be entered. Such a setting can eliminate the influence on the sample gas and improve the accuracy of the sample gas detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the exploded structure of the sampling probe in one embodiment of the utility model;

[0020] Figure 2 yes Figure 1 A schematic cross-sectional view of a sampling probe in one direction;

[0021] Figure 3 yes Figure 1 Side view of the sampling probe from another direction.

[0022] In the accompanying drawings, each reference numeral represents:

[0023] 100. Sampling probe; 11. Air chamber; 111. Filter; 112. Sample gas port; 113. Reflux port; 114. Exhaust port; 115. Calibration port; 12. Reflux valve; 13. Stop valve; 14. Pneumatic actuator; 141. Rotating shaft; 15. Five-position three-way valve; 16. Exhaust valve; 17. Heating element; 18. Insulation element; 19. Casing. DETAILED DESCRIPTION

[0024] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] Please refer to Figures 1 to 3 The present application proposes a sampling probe 100, which is installed in a flue with a built-in power source, including a reflux valve 12 and an air chamber 11 formed by an internal enclosure, a filter 111 is installed in the air chamber 11, and the air chamber 11 is provided with a sample gas port 112 and a reflux port 113 connected thereto, and both the sample gas port 112 and the reflux port 113 are connected to the flue; the reflux valve 12 is arranged at the connection between the reflux port 113 and the air chamber 11, and when the reflux valve 12 is opened, the sample gas port 112, the air chamber 11, the reflux port 113 and the flue are connected to form a circulation loop.

[0028] The air chamber 11 that has not passed the sample gas and the air chamber 11 after the back-blowing operation both contain a large amount of air. When the reflux valve 12 is opened, the power source (not shown) built into the flue (not shown) drives the sample gas to enter the air chamber 11 from the reflux port 113. The newly entered sample gas is mixed with the internal air and then returns to the flue through the sample gas port 112. A certain cycle time can be preset. When the internal and external sample gas contents are balanced, the sample gas detection step can be entered. This setting can eliminate the influence on the sample gas and improve the accuracy of the sample gas detection results.

[0029] Specifically, the sampling probe 100 also includes an exhaust valve 16, and the air chamber 11 is also provided with an exhaust port 114 connected thereto. The exhaust valve 16 is arranged in the exhaust port 114. The sampling probe 100 has a sampling state and a reflux state. When the sampling probe 100 is in the sampling state, the exhaust valve 16 is opened, the reflux valve 12 is closed, and the sample gas port 112, the air chamber 11 and the exhaust port 114 are connected in sequence to form a one-way sampling passage. When the sampling probe 100 is in the reflux state, the exhaust valve 16 is closed, and the reflux valve 12 is opened.

[0030] The exhaust port 114 can be connected to the detection device (not shown) in the CEMS system to detect the exhausted gas. The exhaust valve 16 is used to control the on / off state of the exhaust port 114 and the gas chamber 11. When the sampling probe 100 needs to enter a reflux state, the exhaust valve 16 is closed, so that the internal sample gas and air cannot enter the detection device, thereby ensuring that the detection accuracy of the detection device is not affected.

[0031] Please refer to Figure 2 When the sampling probe 100 enters the sampling state, the detection device detects the incoming gas, and the sample gas enters the gas chamber 11 through the sample gas port 112, and is then transmitted to the detection device from the exhaust port 114. The reflux valve 12 is closed to prevent the sample gas from returning to the flue. The coordinated switching states of the exhaust valve 16 and the reflux valve 12 can be quickly switched under different working conditions, and ensure the smooth progress of the gas sampling and processing process, thereby achieving better technical effects and application value. It is suitable for occasions where frequent gas sampling and discharge are required, and improves the efficiency and reliability of the sampling probe 100.

[0032] In this embodiment, the sampling probe 100 also includes a stop valve 13 and a calibration port 115. The stop valve 13 is arranged at the connection between the sample gas port 112 and the gas chamber 11, and the calibration port 115 is used to transmit the calibration gas to the gas chamber 11; the sampling probe 100 also has a calibration state. When the sampling probe 100 is in the calibration state, the stop valve 13 is closed, the reflux valve 12 is closed, the exhaust valve 16 is opened, and the calibration port 115, the gas chamber 11 and the exhaust port 114 are connected to form a one-way calibration passage; when the sampling probe 100 is in the sampling state and the reflux state, the stop valve 13 is opened.

[0033] The calibration gas is a standard gas with a determined composition and content, which is different from the sample gas content. By comparing the test results of the two, the purpose of testing with the control experimental method is achieved. While testing the sample gas, the accuracy of the current detection device is also determined. If the test results of the calibration gas are different from the calibration results, the detection device can be adjusted.

[0034] During the calibration process, the stop valve 13 is closed, which effectively prevents the calibration gas from entering the flue from the gas chamber 11, avoids the mixing of the calibration gas and the sample gas and affects the detection result of the sample gas, and greatly reduces the deviation between the analysis result of the sample gas by the detection device and the actual sample value.

[0035] In this embodiment, the calibration port 115 can be directly connected to an air cavity with compressed air and calibration gas, and the gas input is controlled by a power source in the air cavity. When the sampling probe 100 is in a reflux state, the calibration port 115 can input compressed air into the air chamber 11, driving the dirt and gas in the air chamber 11 back into the flue from the sample gas port 112. The calibration port 115 can switch the input gas according to the use status of the sampling probe 100, thereby simplifying the internal structure of the sampling probe 100 and improving the use efficiency of the calibration port 115.

[0036] In order to realize the control of the stop valve 13, the sampling probe 100 also includes a valve body assembly, which includes the stop valve 13 and the pneumatic actuator 14, and the pneumatic actuator 14 includes a rotating shaft 141 that is connected to the stop valve 13 in a transmission manner. When gas is introduced into the pneumatic actuator 14, the cylinder in the pneumatic actuator 14 will be affected by the air pressure, thereby driving the rotating shaft 141 to move according to a preset trajectory, realizing the transmission of the stop valve 13, so that the stop valve 13 is opened and closed. In this way, the stop valve 13 is precisely controlled, making the switching between the sampling state and the calibration state in the sampling probe 100 more stable and reliable, and also improving the switching response speed and automation level of the sampling probe 100.

[0037] In some embodiments, the types of the stop valve 13, the reflux valve 12, and the exhaust valve 16 may be the same or different. In this embodiment, the stop valve 13 is a ball valve. The ball valve has a simple structure and can be fully opened or closed by rotating. It is easy to operate and can quickly realize the switch control of the fluid medium. It is flexible in rotation and has a large open passage area, which is conducive to a larger fluid flux passing through the sampling probe 100 when it is in the reflux state.

[0038] At the same time, the internal path of the ball valve is a spherical structure, the passage is unobstructed, the resistance of the fluid passing through is small, which can reduce energy consumption and is suitable for occasions requiring small fluid resistance. In addition, the sealing ring of the ball valve is usually made of elastic material, which can achieve good sealing performance and avoid air and liquid leakage problems, and is suitable for occasions with high sealing requirements.

[0039] Furthermore, the valve body assembly also includes a five-position three-way valve 15, which is connected to the pneumatic actuator 14 and controls the gas input into the pneumatic actuator 14. The shut-off valve 13 needs a specific rotation angle and position to maintain the open state and the closed state. Especially for the shut-off valve 13 of the ball valve type, the five-position three-way valve 15 can realize the precise control of the action of the pneumatic actuator 14. By controlling the flow direction and pressure of the gas source inside the valve, the action speed and position of the pneumatic actuator 14 can be accurately adjusted, which meets the high-precision requirements for the shut-off valve 13 and improves the accuracy and stability of the state switching of the sampling probe 100.

[0040] In this embodiment, a heating element 17 is provided around the outer wall of the air chamber 11. The heating element 17 is used to ensure that the temperature of the sample gas and the calibration gas does not decrease after entering the air chamber 11, so as to avoid condensation of water vapor. The heating element 17 can be in the form of a heating wire or a heating blanket attached to the outer wall of the air chamber 11.

[0041] Furthermore, the outer wall of the heating element 17 is provided with a heat-insulating element 18 to reduce the heat generated by the heating element 17 from being conducted to the outside, reduce the temperature loss, and maintain the temperature in the air chamber 11. The heat-insulating element 18 can be filled with heat-insulating materials, such as asbestos, polyurethane, polystyrene, etc.

[0042] In this embodiment, the sampling probe 100 further includes a housing 19 mounted on the outermost side, which is waterproof and dustproof to ensure the accuracy and stability of the sampling data. The housing 19 can also provide sufficient mechanical support for the sampling probe 100 to ensure that it will not be deformed or damaged during the sampling process, thereby ensuring the effectiveness and reliability of the sampling.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sampling probe, mounted in a flue with a built-in power source, characterized in that: include: An air chamber is formed by internal enclosure, a filter is installed in the air chamber, a sample gas port and a return port are opened in the air chamber, and the sample gas port and the return port are both in communication with the flue; The reflux valve is arranged at the connection between the reflux port and the air chamber. When the reflux valve is opened, the sample gas port, the air chamber, the reflux port and the flue are connected to form a circulation loop.

2. The sampling probe according to claim 1, characterized in that: The sampling probe also includes an exhaust valve, and the air chamber is also provided with an exhaust port connected thereto, and the exhaust valve is arranged in the exhaust port. The sampling probe has a sampling state and a reflux state. When the sampling probe is in the sampling state, the exhaust valve is opened and the reflux valve is closed. The sample gas port, the air chamber and the exhaust port are connected in sequence to form a one-way sampling passage. When the sampling probe is in the reflux state, the exhaust valve is closed and the reflux valve is opened.

3. The sampling probe according to claim 2, characterized in that: The sampling probe further comprises a stop valve and a calibration port, wherein the stop valve is arranged at the connection between the sample gas port and the gas chamber, and the calibration port is used to transmit the calibration gas into the gas chamber; The sampling probe also has a calibration state. When the sampling probe is in the calibration state, the stop valve is closed, the reflux valve is closed, the exhaust valve is opened, and the calibration port, the air chamber and the exhaust port are connected to form a one-way calibration passage. When the sampling probe is in the sampling state and the reflux state, the stop valve is opened.

4. The sampling probe according to claim 3, characterized in that: The sampling probe further comprises a valve body assembly, wherein the valve body assembly comprises the stop valve and a pneumatic actuator, and the pneumatic actuator comprises a rotating shaft drivingly connected to the stop valve.

5. The sampling probe according to claim 4, characterized in that: The stop valve is a ball valve.

6. The sampling probe according to claim 4 or 5, characterized in that: The valve body assembly further comprises a five-position three-way valve, which is connected to the pneumatic actuator and controls the gas input into the pneumatic actuator.

7. The sampling probe according to claim 1, characterized in that: A heating element is arranged around the outer peripheral wall of the air chamber.

8. The sampling probe according to claim 7, characterized in that: The outer peripheral wall of the heating element is sleeved with a heat-insulating element.

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