Gas sampling probe

Abstract

The utility model relates to the technical field of sampling probes, in particular to a gas sampling probe. Comprising a heating cylinder, one end of a detection inlet pipe is installed in the heating cylinder, the other end of the detection inlet pipe extends to the outer side of the heating cylinder, one end of a return pipe is further installed in the heating cylinder, and the other end of the return pipe extends to the outer side of the heating cylinder. The return pipe is communicated with one end, positioned in the heating cylinder, of the detection inlet pipe; the whole detection probe is replaced by the heating cylinder, the detection inlet pipe and the return pipe are both located in the heating cylinder, and gas to be detected is heated when flowing through the heating cylinder, so that the gas to be detected is always kept in a gaseous state; the heating cylinder is in an electric heating state, and if various harmful gases are detected, the temperature of the heating cylinder is higher than the boiling point temperature of the gas with the highest boiling point.

Description

Technical Field

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

[0002] In industrial production, a lot of flue gas is generated. The flue gas needs to comply with relevant emission standards when it is discharged. Therefore, the flue gas needs to be tested before it is discharged to detect the concentration, total amount and other parameters of relevant pollutants in the flue gas. The sampling probe in the flue gas detection equipment is a very important part. During the detection, it is often necessary to pass the gas to be detected into the detection instrument through the sampling probe for detection.

[0003] At present, the sampling probe usually only has a simple collection and filtering function. The gas to be detected is sucked in by the air pump, or directly passed into the sampling probe. Although the structure of this probe is simple, when it detects some harmful gases with higher boiling points, the gas will be partially cooled when it contacts the sampling probe, causing the gas with higher boiling points to become liquid and remain on the inner wall of the sampling probe. Even if it is heated in the detection device, its content will be inaccurate, thus affecting the judgment. Utility Model Content

[0004] In view of the above-mentioned defects, the utility model provides a gas sampling probe to solve the problem that the sampling probe in the prior art cannot be heated.

[0005] The utility model is implemented using the following technical solutions: a gas sampling probe, comprising a heating tube, one end of a detection inlet pipe is installed in the heating tube, the other end of the detection inlet pipe extends to the outside of the heating tube, one end of a return pipe is also installed in the heating tube, the other end of the return pipe extends to the outside of the heating tube, and the return pipe is connected to one end of the detection inlet pipe located in the heating tube.

[0006] Furthermore, the part of the detection inlet tube located outside the heating tube is also installed with one end of a second dilution tube, the other end of the second dilution tube is connected to the first end of a second four-way valve, the second end of the second four-way valve is connected to one end of the first dilution tube, the other end of the first dilution tube is connected to one end of a dilution module, the other end of the dilution module is connected to one end of a vacuum tube, the other end of the vacuum tube extends to the outside of the heating tube, and the dilution module is fixedly installed in the heating tube.

[0007] Furthermore, one end of the dilution module away from the first dilution tube is also connected to one end of a heating tube, and the other end of the heating tube extends to the outside of the heating cylinder.

[0008] Furthermore, the portion of the heating tube located inside the heating tube is also connected to one end of a first dilution air tube and a second dilution air tube, and the other ends of the first dilution air tube and the second dilution air tube both extend to the outside of the heating tube.

[0009] Furthermore, a back-blowing pipe is installed at the third end of the second four-way valve, one end of a back-blowing branch pipe is installed on the first dilution tube, the other end of the back-blowing branch pipe is connected to the detection inlet pipe, and the back-blowing branch pipe is located on the inner side of the heating cylinder; a first back-blowing valve is installed on the second dilution tube, and a second back-blowing valve is installed on the first dilution tube.

[0010] Furthermore, an accumulator is installed at the fourth end of the second four-way valve.

[0011] Furthermore, an ejector is installed at the connection between the detection inlet pipe and the return pipe, one end of an ejector air pipe is installed on the ejector, and the other end of the ejector air pipe extends to the outside of the heating cylinder.

[0012] Furthermore, a differential pressure flowmeter is installed at one end of the detection inlet pipe close to the return pipe.

[0013] Furthermore, a calibration gas mechanism is installed at one end of the detection inlet pipe away from the return pipe.

[0014] Furthermore, electronic flow meters are installed on the standard gas mechanism, the second dilution tube, the detection inlet tube between the second standard gas tube, and the second dilution tube.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. This device replaces the entire detection probe with a heating tube. The detection inlet pipe and the return pipe are both located inside the heating tube. The gas to be detected is heated when it flows through the heating tube, thereby ensuring that the gas to be detected always remains in a gaseous state; the heating tube is electrically heated, and if multiple harmful gases are detected, the temperature of the heating tube must be higher than the boiling point of the gas with the highest boiling point.

[0017] 2. By adding a second dilution tube to the detection inlet pipe, dilution air is introduced into the second dilution tube. The dilution of the dilution air can prevent the detection data from fluctuating due to excessive concentration of harmful gases, thereby affecting the accuracy of the detection. After the dilution air is introduced, it is only necessary to introduce the dilution air and the gas to be detected in proportion, and then restore the obtained data according to the proportion.

[0018] 3. The accumulator can effectively maintain the balance of the pipeline pressure system, thereby protecting the safety of the device.

[0019] A gas sampling probe of the utility model is further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a structural schematic diagram of a gas sampling probe.

[0021] In the figure: 1-detection of inlet pipe;

[0022] 2- standard gas mechanism, 21- first standard gas pipe, 22- first four-way valve, 23- first inlet pipe, 24- first one-way valve, 25- SO2 inlet pipe, 26- second one-way valve, 27- first mixing pipe, 28- SO3 generator, 29- second standard gas pipe;

[0023] 3-heating cylinder; 4-differential pressure flow meter;

[0024] 5-return pipe, 51-injector;

[0025] 61-vacuum tube, 62-first dilution air tube, 63-second dilution air tube, 64-heating tube, 65-injection air tube, 66-air inlet tube;

[0026] 7-dilution module, 71-first dilution pipe, 72-backflush branch pipe;

[0027] 8-first back-blow valve, 81-back-blow pipe, 82-second four-way valve, 83-accumulator, 84-second back-blow valve, 85-second dilution pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific examples described here are only used to explain the utility model and are not used to limit the utility model.

[0029] like Figure 1 As shown, the utility model provides a gas sampling probe, including a heating tube 3, one end of a detection inlet pipe 1 is installed in the heating tube 3, the other end of the detection inlet pipe 1 extends out of the heating tube 3, one end of a return pipe 5 is also installed in the heating tube 3, the other end of the return pipe 5 extends out of the heating tube 3 and is connected to the detection device, and the return pipe 5 is connected to one end of the detection inlet pipe 1 located in the heating tube 3.

[0030] As a further illustration of this example, in the device, the portion of the detection inlet pipe 1 located outside the heating tube 3 is also equipped with one end of a second dilution tube 85, the other end of the second dilution tube 85 is connected to the first end of the second four-way valve 82, the second end of the second four-way valve 82 is also connected to one end of the first dilution tube 71, the other end of the first dilution tube 71 is located inside the heating tube 3 and is connected to one end of the dilution module 7, the other end of the dilution module 7 is connected to one end of the vacuum tube 61 and one end of the heating tube 64, the other ends of the vacuum tube 61 and the heating tube 64 both extend out of the heating tube 3, one end of the first dilution air tube 62 and the second dilution air tube 63 are also installed on the heating tube 64, and the connection between the first dilution air tube 62 and the second dilution air tube 63 and the heating tube 64 are both located inside the heating tube 3, and the ends of the first dilution air tube 62 and the second dilution air tube 63 away from the heating tube 64 both extend out of the heating tube. The first dilution air pipe 62 and the second dilution air pipe 63 are only different in diameter. Therefore, the first dilution air pipe 62 or the second dilution air pipe 63 can be selected according to the required dilution air content. When more dilution air is needed, a dilution air pipe with a larger diameter is used, otherwise, a dilution air pipe with a smaller diameter is used. During detection, if the content of pollutants in the gas to be detected is high and causes inaccurate data, the intervention of dilution air is required. Taking the first dilution air pipe 62 as an example, dilution air is introduced into the first dilution air pipe 62. The dilution air is generally ordinary air and can be introduced by an air pump connected to an external air pump or by any other method. Then, heated air is introduced from the heating pipe 64. The hot air and dilution air flow through the dilution pipe 64. When the module 7 is used, the space becomes larger, so that its flow rate is reduced, so that it can be fully mixed. The mixed hot dilution air flows through the first dilution tube 71 and the second dilution tube 85 and enters the detection inlet tube 1 to dilute the gas to be detected; wherein, the heated air can also be used as dilution air. When the temperature required for the gas to be detected is relatively low, it can be diluted only through the first dilution air tube 62 or the second dilution air tube 63. At this time, the heating tube 64 is no longer needed. When the temperature required for the gas to be detected is relatively high, it is necessary to use it in combination with the heating tube 64 to prevent the dilution air temperature from being too low. When it contacts the gas to be detected, the gas to be detected is cooled, thereby causing it to liquefy; an electronic flow meter is also installed on the second dilution tube 85 to control the inflow of dilution air.

[0031] As a further illustration of this example, an ejector 51 is also installed at the connection between the detection inlet pipe 1 and the return pipe 5, and one end of the ejector air pipe 65 is installed on the ejector 51, and the other end of the ejector air inlet pipe 66 extends to the outside of the heating tube 3; the ejector 51 is a conventional prior art, and the ejector air enters the ejector 51 from the ejector air pipe 65 at a high speed, thereby forming a negative pressure at the detection inlet pipe 1, increasing the intake flow rate of the detection inlet pipe 1, and can also drive the entry of the gas to be detected only through the ejector 51. The gas to be detected is sucked in under the action of the ejector 51, and then enters the detection device through the return pipe 5.

[0032] As a further illustration of this example, a back-blowing pipe 81 can also be connected to the third end of the second four-way valve 82, a first back-blowing valve 8 is installed on the first dilution pipe 71, a second back-blowing valve 84 is installed on the second dilution pipe 85, one end of a back-blowing branch pipe 72 is also connected to the first dilution pipe 71, the other end of the back-blowing branch pipe 72 is connected to the detection inlet pipe 1, and the back-blowing branch pipe 72 is entirely located in the heating tube 3; after the detection is completed or before the detection, back-blowing air is introduced into the back-blowing pipe 81 to remove impurities remaining in the device, thereby further increasing the detection accuracy of the device.

[0033] As a further illustration of this example, an accumulator 83 is also installed at the fourth end of the second four-way valve 82. The accumulator 83 can convert the pressure in the system into compression energy or potential energy for storage when the pressure increases. When the system needs it, it can convert the compression energy or potential energy into air pressure energy and release it to replenish the system, thereby maintaining the pressure balance of the device, making the device more stable, and thus improving the safety of the device.

[0034] As a further illustration of this example, a differential pressure flowmeter 4 is also installed on the detection inlet pipe 1 to monitor the flow of the detection inlet pipe; wherein the differential pressure flowmeter 4 is located at one end of the detection inlet pipe 1 close to the return pipe 5.

[0035] As a further illustration of this example, a standard gas mechanism 2 is also installed at the end of the detection inlet pipe 1 away from the return pipe 5, and the standard gas mechanism 2 is used to transport standard gas into the detection inlet pipe, so as to establish the traceability of the measurement; taking the common SO3 gas in industrial production as an example, the standard gas mechanism 2 includes a second standard gas pipe 29, one end of the second standard gas pipe 29 is connected to the end of the detection inlet pipe 1 away from the return pipe 5, the other end of the second standard gas inlet pipe 29 is connected to the first end of the first four-way valve 22, the second end of the first four-way valve 22 is connected to the air inlet pipe 66, the third end of the first four-way valve 22 is connected to one end of the first inlet pipe 23, and the first The other end of the inlet pipe 23 is connected to one end of the first mixing pipe 27, the other end of the first mixing pipe 27 is connected to the inlet of the SO3 generator 28, the outlet of the SO3 generator 28 is connected to one end of the first standard gas pipe 21, and the other end of the first standard gas pipe 21 is installed at the fourth end of the first four-way valve 22; the first check valve 24 and the SO2 inlet pipe 25 are also installed on the first inlet pipe 23, the first check valve 24 is located between the SO2 inlet pipe 25 and the first four-way valve 22, and the second check valve 26 is also installed on the first mixing pipe 27, and the SO2 inlet pipe is located between the first check valve 24 and the second check valve 26. Air enters from the air inlet pipe 66, mixes with SO2 gas, enters the SO3 generator 28, generates SO3 gas under the action of the catalyst, and then enters the detection inlet pipe.

[0036] As a further explanation of this example, electronic flow meters are installed on the second standard gas pipe 29, the second dilution pipe 85, the detection inlet pipe 1 between the second standard gas pipe 29, and the second dilution pipe 85 to control the content of each gas. The electronic flow meter here can be a commonly used flow meter, such as an MFC electronic flow meter.

[0037] When gas detection is required, it is necessary to carry out detection preparation work first, clean the pipeline through the backblowing tube 81, and then introduce standard gas for calibration, and then evacuate through the vacuum tube 61, and bring the end of the detection inlet pipe 1 away from the return pipe 5 close to the gas to be detected, and inhale the gas to be detected through the ejector 51, and the gas to be detected enters the return pipe 5 through the detection inlet pipe 1. The gas to be detected will be heated by the heating tube 3 in the detection inlet pipe 1 and the return pipe 5, so as to prevent the gas to be detected from liquefying. After passing through the return pipe 5, the gas to be detected enters the detection device to complete the detection.

[0038] In summary, the utility model provides a gas sampling probe, by replacing the entire detection probe with a heating tube 3, the detection inlet pipe 1 and the return pipe 5 are both located inside the heating tube 3, and the gas to be detected is heated when flowing through the heating tube 3, thereby ensuring that the gas to be detected always maintains a gaseous state; the heating tube 3 is in an electrically heated state, and if multiple harmful gases are detected, the temperature of the heating tube 3 must be higher than the boiling point of the gas with the highest boiling point; by adding a second dilution tube 85 to the detection inlet pipe 1, dilution air is introduced into the second dilution tube 85, and the dilution of the dilution air prevents the detection data from fluctuating due to excessive concentration of harmful gases, thereby affecting the accuracy of the detection; after the dilution air is introduced, it is only necessary to introduce the dilution air and the gas to be detected in proportion, and then restore the obtained data by the proportion; the accumulator 83 can effectively maintain the balance of the pressure system of the pipeline, thereby protecting the safety of the device.

[0039] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may still make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A gas sampling probe, characterized in that: The invention comprises a heating tube (3), wherein one end of a detection inlet pipe (1) is installed in the heating tube (3), and the other end of the detection inlet pipe (1) extends to the outside of the heating tube (3); one end of a return pipe (5) is also installed in the heating tube (3), and the other end of the return pipe (5) extends to the outside of the heating tube (3); the return pipe (5) is connected to one end of the detection inlet pipe (1) located in the heating tube (3).

2. The gas sampling probe according to claim 1, characterized in that: The portion of the detection inlet pipe (1) located outside the heating tube (3) is also equipped with one end of a second dilution tube (85); the other end of the second dilution tube (85) is connected to the first end of a second four-way valve (82); the second end of the second four-way valve (82) is connected to one end of a first dilution tube (71); the other end of the first dilution tube (71) is connected to one end of a dilution module (7); the other end of the dilution module (7) is connected to one end of a vacuum tube (61); the other end of the vacuum tube (61) extends to the outside of the heating tube (3); and the dilution module (7) is fixedly installed in the heating tube (3).

3. The gas sampling probe according to claim 2, characterized in that: One end of the dilution module (7) away from the first dilution tube (71) is also connected to one end of a heating tube (64), and the other end of the heating tube (64) extends to the outside of the heating cylinder (3).

4. The gas sampling probe according to claim 3, characterized in that: The portion of the heating tube (64) located inside the heating tube (3) is also connected to one end of a first dilution air tube (62) and a second dilution air tube (63), and the other ends of the first dilution air tube (62) and the second dilution air tube (63) both extend to the outside of the heating tube (3).

5. The gas sampling probe according to claim 2, characterized in that: A back-blowing pipe (81) is also installed at the third end of the second four-way valve (82); one end of a back-blowing branch pipe (72) is also installed on the first dilution pipe (71); the other end of the back-blowing branch pipe (72) is connected to the detection inlet pipe (1); the back-blowing branch pipe (72) is located on the inner side of the heating cylinder (3); a first back-blowing valve (8) is also installed on the second dilution pipe; and a second back-blowing valve (84) is also installed on the first dilution pipe (71).

6. The gas sampling probe according to claim 5, characterized in that: An accumulator (83) is also installed at the fourth end of the second four-way valve (82).

7. The gas sampling probe according to claim 1, characterized in that: An ejector (51) is also installed at the connection between the detection inlet pipe (1) and the return pipe (5), and one end of an ejector air pipe (65) is installed on the ejector (51), and the other end of the ejector air pipe (65) extends to the outside of the heating cylinder (3).

8. The gas sampling probe according to claim 1, characterized in that: A differential pressure flow meter (4) is installed at one end of the detection inlet pipe (1) close to the return pipe (5).

9. The gas sampling probe according to claim 2, characterized in that: A calibration gas mechanism (2) is also installed at one end of the detection inlet pipe (1) away from the return pipe (5).

10. The gas sampling probe according to claim 9, characterized in that: Electronic flow meters are installed on the detection inlet pipe (1) and the second dilution pipe (85) between the calibration gas mechanism (2), the second dilution pipe (85) and the second calibration gas pipe (29).

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