Dust monitor

Abstract

The utility model discloses a dust monitor in the technical field of gas monitoring, a gas inlet pipe of the dust monitor is a straight pipe, the gas inlet pipe is vertically arranged at the top end of a measuring gas chamber, sample gas always keeps vertically flowing downwards in a section of sample gas inlet passage from the gas inlet pipe to the measuring gas chamber, and the direction of the sample gas is the same as that of gravity; the cutting effect of a sample gas inflow passage on particulate matters is reduced, so that the tested data is closer to the real emission concentration, and the authenticity of the data is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of particulate matter monitoring, and specifically relates to a dust monitor. Background Technique

[0002] With the gradual improvement of the requirements of the environmental protection industry, the particulate matter concentration limit values of pollution source emissions have been gradually reduced, resulting in that the existing dust monitors using the backscattering method can no longer meet the on-site test requirements. Therefore, a dust monitor with forward scattering and high-temperature extraction has been developed for the detection of ultra-low concentration particulate matter.

[0003] When monitoring ultra-low concentration particulate matter, the loss of particulate matter during the process of the sample gas passing through the measurement chamber will affect the accuracy of the dust measurement result. Traditional dust monitors only focus on the design of the optical path and do not consider the problem of particulate matter loss when collecting the sample gas.

[0004] In practical applications, when the sample gas passes through the sample gas inlet and circulation path with a right angle or a corner, under the action of inertial separation and gravity, a particulate matter cutting effect will occur, resulting in a difference between the measured value of the sample to be measured and the true concentration, and the particulate matter concentration of the pollution source emission cannot be truly reflected, thus leading to data distortion.

[0005] Based on this, the utility model designs a dust monitor to solve the above problems. Content of the Utility Model

[0006] To achieve the above object, the utility model provides the following technical solution: a dust monitor, including a measurement chamber, a gas path assembly and a monitoring assembly. The gas path assembly includes an inlet pipe installed on the top surface of the measurement chamber and an outlet pipe installed on the bottom surface of the measurement chamber. Both the inlet pipe and the outlet pipe are communicated with the inner cavity of the measurement chamber to form a sample gas inlet and circulation path for the flow of the sample gas. The inlet pipe is a straight pipe and is vertically installed on the top surface of the measurement chamber, and the top opening of the outlet pipe is located directly below the bottom end of the inlet pipe; the monitoring assembly is arranged on the measurement chamber to monitor the sample gas flowing through the measurement chamber.

[0007] As a further solution of the utility model, the inner cavity of the inlet pipe is divided into a first section and a second section from top to bottom, and the cross-sectional area of the first section is larger than that of the second section.

[0008] As a further solution of the utility model, a transition arc surface is provided between the first section and the second section.

[0009] As a further solution of the utility model, the top opening of the outlet pipe is larger than the bottom opening of the inlet pipe.

[0010] As a further solution of the present utility model, the monitoring component includes an optical path tube, a signal transmitting unit for emitting optical signals, and a signal receiving unit for receiving optical signals. There are two optical path tubes, which are respectively installed on both sides of the measurement chamber. The inner cavity of the optical path tube is communicated with the inner cavity of the measurement chamber to form an optical path for the optical signal to pass through. The signal transmitting unit and the signal receiving unit are respectively installed at one end of the two optical path tubes far away from the measurement chamber.

[0011] As a further solution of the present utility model, the bottom end of the intake pipe extends into the inner cavity of the measurement chamber and does not intersect with the optical path, so as to shorten the distance between the bottom end of the intake pipe and the optical path in the vertical direction.

[0012] As a further solution of the present utility model, the top end of the outlet pipe extends into the inner cavity of the measurement chamber and does not intersect with the optical path, so as to shorten the distance between the intake pipe and the outlet pipe in the vertical direction.

[0013] As a further solution of the present utility model, a calibration device is installed on the signal transmitting unit, and the calibration device is used to calibrate the range of the monitoring component.

[0014] As a further solution of the present utility model, the calibration device includes a motor and a baffle. The baffle is divided into multiple simulation areas for simulating the dust state. By controlling the rotation of the baffle through the motor, different simulation areas are rotated between the signal transmitting unit and the signal receiving unit to achieve multi-point calibration.

[0015] As a further solution of the present utility model, a maintenance panel is detachably installed on the front end face of the measurement chamber.

[0016] The present utility model has the following beneficial effects:

[0017] The intake pipe of this device is a straight pipe, and the intake pipe is vertically installed at the top of the measurement chamber. In the sample gas inlet flow path from the intake pipe to the measurement chamber, the sample gas always flows vertically downward, which is the same as the direction of gravity, reducing the cutting effect of the sample gas inlet flow path on the particulate matter, making the measured data closer to the true emission concentration and ensuring the authenticity of the data.

[0018] In addition to the purposes, features and advantages described above, the present utility model has other purposes, features and advantages. The present utility model will be further described in detail below with reference to the drawings. Description of the Drawings

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0020] Figure 1This is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 This is a schematic sectional view of the present utility model.

[0022] Legend description:

[0023] 1. Measuring gas chamber; 11. Maintenance panel; 2. Inlet pipe; 21. First section; 22. Second section; 3. Outlet pipe; 31. Jet sampling device; 4. Optical path tube; 5. Signal transmitting unit; 6. Signal receiving unit. Specific implementation manner

[0024] The following will describe in detail the embodiments of the present utility model with reference to the accompanying drawings. However, the present utility model can be implemented in many different ways defined and covered by the following.

[0025] Please refer to Figure 1-2 , the present utility model provides a dust monitor, which includes a measuring gas chamber 1, a gas path assembly and a monitoring assembly.

[0026] The gas path assembly includes an inlet pipe 2 provided on the top surface of the measuring gas chamber 1 for inputting sample gas into the measuring gas chamber 1 and an outlet pipe 3 provided on the bottom surface of the measuring gas chamber 1 for discharging the sample gas in the measuring gas chamber 1. Both the inlet pipe 2 and the outlet pipe 3 are communicated with the inner cavity of the measuring gas chamber 1 to form a sample gas inlet flow path for the sample gas to flow. The inlet pipe 2 is a straight pipe and is vertically installed at the top of the measuring gas chamber 1. The top opening of the outlet pipe 3 is located directly below the inlet pipe 2, so that the flow direction of the sample gas in the sample gas inlet flow path is the same as the gravity direction. When the sample gas passes through the measuring gas chamber 1, the flow direction remains unchanged and is consistent with the gravity direction all the time, effectively reducing the loss of dust in the sample gas due to gravity and inertial separation during the process of passing through the measuring gas chamber 1, making the measured data more accurate.

[0027] Specifically, a jet sampling device 31 is provided below the outlet pipe 3 for generating negative pressure to drive the sample gas to flow in the sample gas inlet flow path.

[0028] Specifically, the top opening of the outlet pipe 3 is located directly below the inlet pipe 2. Since the measurement of dust in the sample gas is completed in the measuring gas chamber 1, therefore, it is only necessary to ensure that the flow direction of the sample gas remains unchanged and is consistent with the gravity direction when passing through the measuring gas chamber 1. When the sample gas enters the outlet pipe 3, there is no need to pay attention to the loss problem of dust in the sample gas anymore. In this way, there is no limitation on the pipe body shape of the outlet pipe 3. However, the opening at the top of the outlet pipe 3 connecting to the inner cavity of the measuring gas chamber 1 needs to be located directly below the inlet pipe 2, so that the sample gas flows vertically downward into the outlet pipe 3 after leaving the inlet pipe 2, reducing the cutting effect on dust during the process of the sample gas passing through the measuring gas chamber 1, making the dust in the sample gas more concentrated, and further improving the accuracy of dust measurement.

[0029] As Figure 2 shown, in some examples, the top opening of the outlet pipe 3 is larger than the bottom opening of the inlet pipe 2. When the sample gas in the inlet pipe 2 enters the measurement chamber 1, it will diverge. Therefore, the opening at the top of the outlet pipe 3 needs to be larger than the opening at the bottom of the inlet pipe 2 so that the outlet pipe 3 can receive all the sample gas sent from the inlet pipe 2, preventing the sample gas from hitting the inner cavity wall of the measurement chamber 1 and scattering, ensuring the stability of the dust during the process of the sample gas passing through the measurement chamber 1 and improving the accuracy of dust measurement.

[0030] The monitoring component includes a signal transmitting unit 5 and a signal receiving unit 6. The signal transmitting unit 5 and the signal receiving unit 6 are respectively arranged on opposite sides of the measurement chamber 1. When installing the signal transmitting unit 5, the optical signal emitted by the signal transmitting unit 5 can vertically pass through the sample gas inlet and outlet passage, and the optical signal emitted by the signal transmitting unit 5 can just pass through the measurement chamber 1 and be received by the signal receiving unit 6. During measurement, the sample gas enters the measurement chamber 1 from the inlet pipe 2 and then leaves the measurement chamber 1 from the outlet pipe 3. Under the guidance of the inlet pipe 2, the sample gas will remain within a certain range when passing through the measurement chamber 1. The optical signal emitted by the signal transmitting unit 5 can just pass through the sample gas to realize the measurement of the dust in the sample gas in the measurement chamber 1.

[0031] As Figure 2 shown, in some examples, the inner cavity of the inlet pipe 2 is divided into a first section 21 and a second section 22 from top to bottom. The aperture of the first section 21 is larger than that of the second section 22 to reduce the diameter of the gas flow column when the sample gas enters the measurement chamber 1, making it easier for the dust in the sample gas to be monitored by the monitoring component and improving the measurement accuracy of low-concentration dust.

[0032] In this example, a transition arc surface is provided between the first section 21 and the second section 22 so that the sample gas can smoothly transition from the first section 21 to the second section 22.

[0033] As Figure 2As shown, in some examples, the bottom end of the intake pipe 2 and the top end of the exhaust pipe 3 both extend into the inner cavity of the measurement chamber 1, and neither the bottom end of the intake pipe 2 nor the top end of the exhaust pipe 3 intersects the optical path. When the sample gas leaves the intake pipe 2, it will diverge. The greater the height difference between the optical signal emitted by the signal emission unit 5 and the bottom end of the intake pipe 2, the greater the divergence degree of the sample gas itself when it flows to the position of the optical signal. Inserting the bottom end of the intake pipe 2 into the inner cavity of the measurement chamber 1 makes the bottom end of the intake pipe 2 closer to the optical signal emitted by the signal emission unit 5. When the optical signal passes through the sample gas, the divergence degree of the sample gas is smaller. At the same time, the exhaust pipe 3 protruding from the inner cavity wall of the measurement chamber 1 can further shorten the distance between the intake pipe 2 and the exhaust pipe 3, thereby shortening the flow distance of the sample gas in the measurement chamber and reducing the divergence degree of the sample gas, enabling the sample gas to enter the exhaust pipe 3 more quickly and preventing the sample gas from colliding and reflecting with the inner cavity wall of the measurement chamber 1 to disturb the air inside the measurement chamber, further improving the measurement accuracy.

[0034] Figure 1-2 An example of the monitoring component is shown. In this example, optical path tubes 4 are installed at both the left and right ends of the measurement chamber 1. The signal emission unit 5 and the signal reception unit 6 are respectively installed on the end faces of the two optical path tubes 4 away from the measurement chamber 1, realizing the modular design of the signal emission unit 5, the signal reception unit 6, and the measurement chamber 1, which is convenient for the maintenance of the signal emission unit 5, the signal reception unit 6, and the measurement chamber 1.

[0035] In some examples, a calibration device is installed on the signal emission unit 5, and the calibration device is used to calibrate the range of the monitoring component.

[0036] Specifically, the calibration device includes a motor and a shutter. The shutter is divided into multiple simulation areas for simulating the dust state. Different areas are used to simulate different dust states. By controlling the rotation of the shutter by the motor, different simulation areas are rotated between the signal emission unit 5 and the signal reception unit 6 to achieve multi-point calibration.

[0037] As Figure 1 shown, in some examples, a maintenance panel 11 is detachably installed on the front end face of the measurement chamber 1, which is convenient for cleaning the inner cavity of the measurement chamber 1.

[0038] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dust monitor, comprising a measurement chamber (1), a gas path assembly, and a monitoring assembly, characterized in that: The gas path assembly includes an intake pipe (2) installed on the top surface of the measurement chamber (1) and an outlet pipe (3) installed on the bottom surface of the measurement chamber (1). Both the intake pipe (2) and the outlet pipe (3) are communicated with the inner cavity of the measurement chamber (1) to form a sample gas inlet and circulation path for the flow of sample gas. The intake pipe (2) is a straight pipe and is vertically installed on the top surface of the measurement chamber (1). The top opening of the outlet pipe (3) is located directly below the intake pipe (2); The monitoring assembly is arranged on the measurement chamber (1) for monitoring the sample gas flowing through the measurement chamber (1).

2. The dust monitor according to claim 1, wherein: The inner cavity of the intake pipe (2) is divided into a first section (21) and a second section (22) from top to bottom, and the cross-sectional area of the first section (21) is larger than that of the second section (22).

3. The dust monitor according to claim 2, characterized in that: There is a transition arc surface between the first section (21) and the second section (22).

4. The dust monitor according to claim 1, wherein: The top opening of the outlet pipe (3) is larger than the bottom opening of the intake pipe (2).

5. The dust monitor according to claim 1, characterized in that: The monitoring assembly includes an optical path tube (4), a signal transmitting unit (5) for emitting optical signals, and a signal receiving unit (6) for receiving optical signals. There are two optical path tubes (4) which are respectively installed on both sides of the measurement chamber (1). The inner cavity of the optical path tube (4) is communicated with the inner cavity of the measurement chamber (1) to form an optical path for the optical signal to pass through. The signal transmitting unit (5) and the signal receiving unit (6) are respectively installed at one end of the two optical path tubes (4) far from the measurement chamber (1).

6. The dust monitor according to claim 5, wherein: The bottom end of the intake pipe (2) extends into the inner cavity of the measurement chamber (1) and does not intersect with the optical path, so as to shorten the distance between the bottom end of the intake pipe (2) and the optical path in the vertical direction.

7. The dust monitor according to claim 1, characterized in that: The top end of the outlet pipe (3) extends into the inner cavity of the measurement chamber (1) and does not intersect with the optical path, so as to shorten the distance between the intake pipe (2) and the outlet pipe (3) in the vertical direction.

8. A dust monitor according to claim 5, characterized in that: A calibration device is installed on the signal transmitting unit (5), and the calibration device is used to calibrate the range of the monitoring assembly.

9. The dust monitor according to claim 8, wherein: The calibration device includes a motor and a baffle. The baffle is divided into multiple simulation areas for simulating the dust state. By controlling the rotation of the baffle by the motor, different simulation areas are rotated between the signal transmitting unit (5) and the signal receiving unit (6) to achieve multi-point calibration.

10. A dust monitor according to claim 1, characterized in that: A maintenance panel (11) is detachably installed on the front end face of the measurement chamber (1).

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