Portable flue gas sampling gun

Abstract

The utility model discloses a portable flue gas sampling gun which comprises a sampling gun barrel, a first filtering structure arranged at the first end of the sampling gun barrel, a connector arranged at the second end of the sampling gun barrel and a hole blocking plate connected to the outer wall of the sampling gun barrel in a sleeving mode. The minimum distance between the edge end of the hole blocking plate and the center of the movable hole blocking plate is larger than or equal to the radius of a measuring hole, and the connector is used for outputting a sample obtained by the sampling gun barrel. By arranging the first filtering structure at the first end of the sampling gun barrel, the possibility that dust enters the sampling gun barrel is reduced, the phenomena of gun barrel blockage, equipment damage and the like caused by the dust can be effectively solved, the detection accuracy is improved, the outer wall of the sampling gun barrel is sleeved with the hole blocking plate, air can be prevented from being sucked into a flue through a gap between the sampling gun and a detection hole, and the detection efficiency is improved. And the detection accuracy is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke treatment, in particular to a portable smoke sampling gun. Background Art

[0002] The flue gas of coal-fired power plants contains a large amount of nitrogen oxides, which are harmful to the environment and human health. Denitrification facilities can effectively remove nitrogen oxides from flue gas and are an essential part of coal-fired flue gas treatment. Denitrification flue gas detection plays an important role in the stable operation of denitrification facilities, ensuring denitrification efficiency and verifying the overhaul effect of denitrification facilities.

[0003] The denitrification facility is arranged before the dust removal facility. The large amount of dust contained in the flue gas will block the sampling tube of the flue gas sampling gun and even damage the flue gas analysis equipment, affecting the accuracy of flue gas detection. The diameter of the flue gas sampling gun is smaller than the diameter of the measuring hole. Since the denitrification flue is in a negative pressure state, during the detection process, air will be sucked into the flue through the gap between the sampling gun and the measuring hole. The inhaled air will cause flow field disturbance at the measuring point and dilute the flue gas, reducing the accuracy of the detection.

[0004] In order to effectively obtain the distribution of flue gas components, it is necessary to adjust the insertion length of the sampling gun to detect multiple measuring points in the measuring hole. Inaccurate adjustment of the insertion length of the sampling gun will deviate from the sampling measuring point, resulting in poor representativeness of the obtained test data and reduced accuracy of the test.

[0005] The existing portable flue gas sampling gun, such as CN204536055U, has the following structural features: a flue gas sampling tube with adjustable length is provided, a plurality of sampling holes are evenly distributed on the side wall of the flue gas sampling tube in the same axial direction, and a filter is provided in each sampling hole; wireless temperature sensing probes are provided on the side wall of the flue gas sampling tube at the same axial position as the sampling holes; a wireless receiver is provided corresponding to the wireless temperature sensing probe, and a signal processing module is provided to obtain a temperature detection signal output by the wireless receiver; the front end of the flue gas sampling tube is closed, and the rear end is connected to the flue gas analyzer through a rubber tube, and a pre-pump preprocessor is provided in the rubber tube.

[0006] However, in actual use, the filter set in the sampling hole has an obvious filtering effect on dust with larger particles, but it cannot avoid the problem of inaccurate detection caused by a large amount of tiny dust. The sampling device cannot block the gap between the sampling gun and the measuring hole. The air will be sucked into the flue through the gap. The inhaled air will cause flow field disturbances at the measuring point and dilute the flue gas, reducing the accuracy of the detection. In addition, there are no scale lines on the sampling device, and the extension length of the sampling gun cannot be effectively adjusted so that the sampling gun can accurately reach the measuring point. The obtained detection data is less representative, which reduces the accuracy of the detection. Utility Model Content

[0007] The purpose of the utility model is to provide a portable flue gas sampling gun, which is used to extract flue gas in facilities such as denitrification during the operation of a coal-fired power plant. The extracted flue gas is used to detect the composition of the flue gas. This can solve the problem of detection inaccuracy caused by dust, air inhalation and deviation of the sampling gun from the measuring point during the flue gas detection process, and effectively improve the accuracy of the detection data.

[0008] In order to solve the above technical problems, an embodiment of the utility model provides a portable smoke sampling gun, including a sampling gun barrel, a first filtering structure arranged at the first end of the sampling gun barrel, a connecting head arranged at the second end of the sampling gun barrel, and a baffle plate sleeved on the outer wall of the sampling gun barrel, the minimum distance between the edge end of the baffle plate and the center of the baffle plate is greater than or equal to the radius of the measuring hole, and the connecting head is used to output the sample obtained by the sampling gun barrel.

[0009] It also includes a second filtering structure arranged at the second end of the sampling gun barrel, the second filtering structure includes a filter cavity and a second filter core, the second filter core is arranged in the filter cavity, and is used for filtering the sample output from the second end of the sampling gun barrel, the filter cavity is bolted to the second end of the sampling gun barrel, and the outlet end of the connector passes through the bottom through hole of the filter cavity.

[0010] Wherein, the first filtering structure comprises a filter gun nozzle and a first filter core, the first filter core is arranged in the filter gun nozzle, and the filter gun nozzle is bolted to the first end of the sampling gun barrel.

[0011] Among them, the first filter element and the second filter element are any one of a ceramic filter element, a PP filter element, a wire-wound filter element, and an activated carbon filter element. The diameter of the filtered particles of the first filter element is less than or equal to 30 μm, and the diameter of the filtered particles of the second filter element is less than or equal to 0.5 μm.

[0012] Among them, the hole-blocking plate is a movable hole-blocking plate, which is slidably connected to the outer wall of the sampling gun barrel, the outer wall of the sampling gun barrel is provided with a sliding slot, and the inner wall of the through hole of the movable hole-blocking plate is provided with a protrusion, and the protrusion of the movable hole-blocking plate is engaged with the outer wall of the sampling gun barrel through the sliding slot.

[0013] The movable baffle plate has a length of 50mm-150mm, a width of 50mm-150mm, a thickness of 3mm-15mm, and a diameter of the central circular hole of 15.1mm-35.2mm.

[0014] Wherein, it also includes scale lines arranged on the outer side wall of the sampling gun barrel along the length direction of the sampling gun barrel.

[0015] The scale lines are scale lines arranged alternately with solid lines and dotted grooves with a width of 2mm-2.5mm and a depth of 0.2mm-0.25mm.

[0016] Among them, the sampling gun barrel is a C2507 ferrite-austenite stainless steel sampling gun barrel or an aluminum alloy sampling gun barrel, the filter gun nozzle is a C2507 ferrite-austenite stainless steel filter gun nozzle or an aluminum alloy filter gun nozzle, and the filter cavity is a C2507 ferrite-austenite stainless steel filter cavity or an aluminum alloy filter cavity.

[0017] Wherein, the length of the sampling gun barrel is 1000mm-5000mm, the outer diameter of the sampling gun barrel is 15mm-35mm, and the inner diameter of the sampling gun barrel is 12mm-33mm.

[0018] Compared with the prior art, the portable smoke sampling gun provided by the embodiment of the utility model has the following advantages:

[0019] The portable flue gas sampling gun provided by the embodiment of the utility model reduces the possibility of dust entering the sampling gun barrel by arranging a first filtering structure at the first end of the sampling gun barrel, which can effectively solve the problems of gun barrel blockage and equipment damage caused by dust, and improve the detection accuracy. The baffle plate is sleeved on the outer wall of the sampling gun barrel to prevent air from being sucked into the flue through the gap between the sampling gun and the measuring hole, thereby effectively improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of an embodiment of a portable smoke sampling gun provided by the utility model;

[0022] Among them, there are a filter gun nozzle-1, a first ceramic filter element-2, a sampling gun barrel-3, a movable orifice plate-4, a filter cavity-5, a second ceramic filter element-6, a connector-7 and a scale line-8. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of an embodiment of a portable smoke sampling gun provided by the utility model.

[0025] In a specific embodiment, the portable smoke sampling gun includes a sampling gun barrel 3, a first filtering structure arranged at the first end of the sampling gun barrel 3, a connector 7 arranged at the second end of the sampling gun barrel 3, and a baffle plate sleeved on the outer wall of the sampling gun barrel 3, the minimum distance between the edge end of the baffle plate and the center of the baffle plate 4 is greater than or equal to the radius of the measuring hole, and the connector 7 is used to output the sample obtained by the sampling gun barrel 3.

[0026] By setting a first filtering structure at the first end of the sampling gun barrel 3, the possibility of dust entering the sampling gun barrel 3 is reduced, which can effectively solve the problems of gun barrel blockage and equipment damage caused by dust, and improve the detection accuracy. A baffle plate is sleeved on the outer wall of the sampling gun barrel 3 to prevent air from being sucked into the flue through the gap between the sampling gun and the measuring hole, effectively improving the detection accuracy.

[0027] In order to further reduce the impact of dust particles, in one embodiment, the portable smoke sampling gun also includes a second filtering structure arranged at the second end of the sampling gun barrel 3, the second filtering structure includes a filter cavity 5 and a second filter element, the second filter element is arranged in the filter cavity 5, and is used to filter the sample output from the second end of the sampling gun barrel 3. The filter cavity 5 is bolted to the second end of the sampling gun barrel 3, and the outlet end of the connecting head 7 passes through the bottom through hole of the filter cavity 5.

[0028] The sample passing through the sampling gun barrel 3 is filtered again by the filter cavity 5 and the second filter core of the second filter structure, thereby reducing the output of dust particles and further improving the filtering effect.

[0029] It should be noted that the second filter structure can filter finer dust than the first filter structure. If a second filter structure with stronger filtering ability is directly set in the place of the first filter structure, the filter screen will be easily clogged. The two-level filtering system in this application can effectively solve the problems of gun barrel clogging and equipment damage caused by dust, and improve the detection accuracy.

[0030] It should be pointed out that, according to other requirements, more levels of filtering structures can be set in the portable smoke sampling gun by pre-setting or multi-stage cascading.

[0031] In the present application, there is no limitation on the structures of the first filter structure and the second filter structure, as well as the material and filtering capacity of the filter element.

[0032] In one embodiment, the first filtering structure includes a filter gun nozzle 1 and a first filter core, the first filter core is arranged in the filter gun nozzle, and the filter gun nozzle is bolted to the first end of the sampling gun barrel 3.

[0033] By arranging the first filter element in the filter gun mouth, the filter gun mouth is bolted to the first end of the sampling gun barrel 3, so as to facilitate the removal and replacement of the filter element. The filter gun mouth structure can improve the accuracy of sampling.

[0034] It should be pointed out that the present application includes but is not limited to the above-mentioned filter gun nozzle structure, and does not limit the connection structure between it and the sampling gun barrel 3. In addition to bolt connection, a clamping structure or the like can also be used.

[0035] The present application does not limit the material and filtration diameter of the first filter element and the second filter element. In one embodiment, the first filter element and the second filter element are any one of a ceramic filter element, a PP filter element, a wire-wound filter element, and an activated carbon filter element. The diameter of the filtered particles of the first filter element is less than or equal to 30 μm, and the diameter of the filtered particles of the second filter element is less than or equal to 0.5 μm.

[0036] The present application can also select filter elements of other materials, or combine multiple different filter elements as needed.

[0037] In the present application, the gap between the sampling gun barrel 3 and the measuring hole is closed by a baffle plate to ensure that external air does not enter and dilute the gas in the sample area, thereby improving the accuracy of the test. In order to further improve the flexibility of the test depth, in one embodiment, the baffle plate is a movable baffle plate 4, and the movable baffle plate 4 is slidably connected to the outer wall of the sampling gun barrel 3. The outer wall of the sampling gun barrel 3 is provided with a sliding slot, and the inner wall of the through hole of the movable baffle plate 4 is provided with a protrusion, and the protrusion of the movable baffle plate 4 is engaged with the outer wall of the sampling gun barrel 3 through the sliding slot.

[0038] By slidingly connecting the movable baffle plate 4 with the outer wall of the sampling gun barrel 3, the measurement of samples at different depths can be achieved without using different sampling gun barrels 3, which greatly reduces the test cost and improves the test efficiency.

[0039] The movable baffle plate 4 of the present application is slidably connected to the outer wall of the sampling gun barrel 3, which is not limited to the above-mentioned connection structure, and other structures can also be used.

[0040] The present application does not limit the material and size of the movable baffle plate 4. In one embodiment, the movable baffle plate 4 has a length of 50mm-150mm, a width of 50mm-150mm, a thickness of 3mm-15mm, and a central circular hole diameter of 15.1mm-35.2mm.

[0041] Furthermore, in order to improve the accuracy of the test, in one embodiment, the portable smoke sampling gun further includes a scale line 8 arranged on the outer side wall of the sampling gun barrel 3 along the length direction of the sampling gun barrel 3 .

[0042] By setting the scale line 8, the penetration depth of the portable flue gas sampling gun can be precisely controlled, thereby improving the test accuracy.

[0043] In order to further improve the convenience of reading, in a rear forty miles, the scale lines 8 are scale lines 8 arranged alternately with solid lines and dotted grooves with a width of 2mm-2.5mm and a depth of 0.2mm-0.25mm.

[0044] The material of the sampling gun barrel 3 and the filtering structure is not limited in the present application. In one embodiment, the sampling gun barrel 3 is a C2507 ferrite-austenite stainless steel sampling gun barrel 3 or an aluminum alloy sampling gun barrel 3, the filtering gun nozzle 1 is a C2507 ferrite-austenite stainless steel filtering gun nozzle 1 or an aluminum alloy filtering gun nozzle 1, and the filtering chamber 5 is a C2507 ferrite-austenite stainless steel filtering chamber 5 or an aluminum alloy filtering chamber 5.

[0045] The present application includes but is not limited to the use of stainless steel and aluminum alloy for the material manufacturing of the sampling gun.

[0046] The present application does not limit the size of the sampling barrel 3. In one embodiment, the length of the sampling barrel 3 is 1000mm-5000mm, the outer diameter of the sampling barrel 3 is 15mm-35mm, and the inner diameter of the sampling barrel 3 is 12mm-33mm.

[0047] In the present application, parameters such as the length of the sampling barrel 3 can be designed accordingly according to different testing occasions.

[0048] In one embodiment, the portable smoke sampling gun comprises a filter gun nozzle 1, a first ceramic filter element 2, a sampling gun barrel 3, a movable baffle plate 4, a filter cavity 5, a second ceramic filter element 6, a connector 7 and a scale line 8.

[0049] The filter gun nozzle 1 and the sampling gun barrel 3 are connected by threads, which is convenient for disassembling and replacing the first ceramic filter element 2; the sampling gun barrel 3 and the filter cavity 5 are connected by threads, which is convenient for disassembling and replacing the second ceramic filter element 6. The movable orifice plate 4 can move along the length direction of the sampling gun barrel 3, and is used to block the gap between the sampling gun and the measuring hole when detecting measuring points of different depths.

[0050] The filter gun nozzle, the first ceramic filter element and the filter cavity, and the second ceramic filter element constitute the secondary filtration system of the sampling gun. The filter gun nozzle and the first ceramic filter element are primary filtration, which can filter out particles with a particle size greater than 30μm in the flue gas, avoid clogging or scaling of the sampling gun barrel, and at the same time reduce the filtration pressure of the second ceramic filter element 6 and increase its service life; the filter cavity and the second ceramic filter element constitute secondary filtration, which can effectively filter dust particles with a particle size greater than 0.5μm, avoid damage to the flue gas analysis equipment, and at the same time, play a role in stabilizing the flow of flue gas, avoid drastic changes in detection data caused by periodic impact of flue gas, and improve detection stability.

[0051] The filter gun nozzle, sampling gun barrel and filter chamber are made of C2507 ferrite-austenite (duplex) stainless steel, which provides high mechanical strength for the sampling gun while ensuring its resistance to pitting corrosion, crevice corrosion, uniform corrosion and stress corrosion cracking.

[0052] The sampling gun barrel 3 has a length of 1000mm-5000mm, an outer diameter of 15mm-35mm, and an inner diameter of 12mm-33mm. The movable baffle plate 4 has a length of 50mm-150mm, a width of 50mm-150mm, a thickness of 3mm-15mm, and a central circular hole diameter of 15.1mm-35.2mm.

[0053] The scale lines 8 are solid lines and dotted grooves with a width of 2mm and a depth of 0.2mm, which are used to accurately display the length of the sampling gun inserted into the measuring hole. A single dotted line indicates that the length of the sampling gun inserted into the measuring hole is 500mm. A single solid line indicates that the length of the sampling gun inserted into the measuring hole is 1000mm. The length of the sampling gun inserted indicated by multiple scale lines is the cumulative result of each scale line. For example, one solid line and one dotted line indicate that the length of the sampling gun inserted is 1000mm+500mm=1500mm.

[0054] When the sampling gun is used, the filter gun nozzle 1, the first ceramic filter element 2, and the sampling gun barrel 3 are inserted into the measuring hole, and the insertion length is determined by the scale line 8, and the movable hole-blocking plate 4 is pushed toward the filter gun nozzle 1 until the measuring hole is blocked. When the measuring hole contains multiple measuring points, the sampling gun insertion length can be accurately adjusted by the scale line 8 when changing the measuring point, and the movable hole-blocking plate 4 can be pushed until the measuring hole is completely blocked.

[0055] In summary, the portable flue gas sampling gun provided by the embodiment of the utility model reduces the possibility of dust entering the sampling gun barrel by setting a first filtering structure at the first end of the sampling gun barrel, which can effectively solve the problems of barrel blockage and equipment damage caused by dust, and improve the detection accuracy. A baffle plate is sleeved on the outer wall of the sampling gun barrel to prevent air from being sucked into the flue through the gap between the sampling gun and the measuring hole, thereby effectively improving the detection accuracy.

[0056] The portable smoke sampling gun provided by the utility model is introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A portable smoke sampling gun, characterized in that: It includes a sampling gun barrel, a first filtering structure arranged at the first end of the sampling gun barrel, a connector arranged at the second end of the sampling gun barrel, and a baffle plate sleeved on the outer wall of the sampling gun barrel, the minimum distance between the edge end of the baffle plate and the center of the baffle plate is greater than or equal to the radius of the measuring hole, and the connector is used to output the sample obtained by the sampling gun barrel.

2. The portable smoke sampling gun according to claim 1, characterized in that: It also includes a second filter structure arranged at the second end of the sampling gun barrel, the second filter structure includes a filter cavity and a second filter core, the second filter core is arranged in the filter cavity, and is used to filter the sample output from the second end of the sampling gun barrel. The filter cavity is bolted to the second end of the sampling gun barrel, and the outlet end of the connector passes through the bottom through hole of the filter cavity.

3. The portable smoke sampling gun according to claim 2, characterized in that: The first filtering structure comprises a filter gun nozzle and a first filter core, wherein the first filter core is arranged in the filter gun nozzle, and the filter gun nozzle is bolted to the first end of the sampling gun barrel.

4. The portable smoke sampling gun according to claim 3, characterized in that: The first filter element and the second filter element are any one of a ceramic filter element, a PP filter element, a wire-wound filter element, and an activated carbon filter element. The diameter of the filtered particles of the first filter element is less than or equal to 30 μm, and the diameter of the filtered particles of the second filter element is less than or equal to 0.5 μm.

5. The portable smoke sampling gun according to claim 1, characterized in that: The hole-blocking plate is a movable hole-blocking plate, which is slidably connected to the outer wall of the sampling gun barrel. The outer wall of the sampling gun barrel is provided with a sliding slot, and the inner wall of the through hole of the movable hole-blocking plate is provided with a protrusion. The protrusion of the movable hole-blocking plate is engaged with the outer wall of the sampling gun barrel through the sliding slot.

6. The portable smoke sampling gun according to claim 5, characterized in that: The length of the movable baffle plate is 50mm-150mm, the width is 50mm-150mm, the thickness is 3mm-15mm, and the diameter of the central circular hole is 15.1mm-35.2mm.

7. The portable smoke sampling gun according to claim 6, characterized in that: It also includes scale lines arranged on the outer side wall of the sampling gun barrel along the length direction of the sampling gun barrel.

8. The portable smoke sampling gun according to claim 7, characterized in that: The scale lines are scale lines arranged alternately with solid lines and dotted grooves with a width of 2mm-2.5mm and a depth of 0.2mm-0.25mm.

9. The portable smoke sampling gun according to claim 4, characterized in that: The sampling gun barrel is a C2507 ferrite-austenite stainless steel sampling gun barrel or an aluminum alloy sampling gun barrel, the filter gun nozzle is a C2507 ferrite-austenite stainless steel filter gun nozzle or an aluminum alloy filter gun nozzle, and the filter cavity is a C2507 ferrite-austenite stainless steel filter cavity or an aluminum alloy filter cavity.

10. The portable smoke sampling gun according to claim 9, characterized in that: The length of the sampling gun barrel is 1000mm-5000mm, the outer diameter of the sampling gun barrel is 15mm-35mm, and the inner diameter of the sampling gun barrel is 12mm-33mm.

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