CN113740121A - Dioxin sampling system - Google Patents
Dioxin sampling system Download PDFInfo
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- CN113740121A CN113740121A CN202111051223.7A CN202111051223A CN113740121A CN 113740121 A CN113740121 A CN 113740121A CN 202111051223 A CN202111051223 A CN 202111051223A CN 113740121 A CN113740121 A CN 113740121A
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- sampling
- dioxin
- hot air
- sampling gun
- sampling system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N2001/2282—Devices for withdrawing samples in the gaseous state with cooling means
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
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- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
According to the novel dioxin sampling system provided by the invention, the requirement on a site power supply is reduced by utilizing the fact that a vortex tube has no moving part, meanwhile, compressed air is used as power by combining more valves in a boiler site, a sampling gun annular interlayer sleeved in the tail section inner cavity of the sampling gun outside a flue is introduced, the temperature of sampling flue gas is regulated, the characteristics of compressed air interfaces are reserved at multiple parts of a hearth and the flue, the effect of convenient taking is achieved, the advantages of rapid refrigeration and heating and the like can be realized without a refrigerant, a heating device, a refrigerating machine and accessory equipment of a dioxin collecting device in the prior art are cancelled, and the reliability, portability and adaptability of the arrangement of the dioxin collecting device are improved.
Description
Technical Field
The invention relates to the field of fixed source pollutant monitoring, in particular to a dioxin sampling system.
Background
In the existing dioxin sampling method, in order to ensure that water vapor in flue gas is not condensed inside a gun barrel in the constant-speed sampling process, a gun barrel heating device is generally required to be added.
In addition, a set of refrigerating machine, refrigerant and its auxiliary equipment are required to be added for separating and storing the water condensed from the exhaust gas when passing through the gas phase trapping device. However, due to the limitation of production site conditions, a generally provided test platform is small, a power supply interface is insufficient, especially for sampling for scientific research purposes, in order to analyze easily generated portions of dioxin and control measures, sampling may need to be performed at multiple points of the whole flue gas flow besides a chimney, and sampling points are often narrow in channels and platforms and free of power supply arrangement, so that the situation of difficult sampling is caused.
Disclosure of Invention
The invention provides a dioxin sampling system, aiming at the problem that dioxin is difficult to sample in the prior art.
The invention is realized by the following technical scheme:
a dioxin sampling system comprises a sampling gun, a vortex tube and a gas trapping device;
the tail end of the sampling gun is sequentially connected with a filter cylinder and an air trapping device;
the sampling gun tail section and the periphery of the filter cylinder are sleeved with a sampling gun annular interlayer to form a sealed sampling gun annular interlayer space;
the vortex tube is provided with a compressed air interface for accessing compressed air, a hot air outlet is accessed to one end of a filter cylinder in the annular interlayer space of the sampling gun through a hot air pipeline, and a cold air outlet is accessed to a cooling device arranged outside the air trapping device.
Furthermore, the cold air outlet is also provided with a cold air branch which is converged with the hot air pipeline.
Furthermore, one end of the sampling gun annular interlayer, which is far away from the filter cylinder, is provided with a heat preservation hot air outlet.
Furthermore, a pitot tube and a thermocouple are arranged on the lower side of the gun head at the end part of the sampling gun, the output end of the pitot tube is connected with a micro-manometer, and the output end of the thermocouple is connected with a thermocouple thermometer.
Further, the output end of the gas trapping device is sequentially connected with a flowmeter and a variable-frequency air pump; and the output ends of the micro-pressure meter, the thermocouple thermometer and the flow meter are connected into a terminal, and the output end of the terminal is connected into a variable-frequency air pump.
Further, still include the thermostated container, cooling device sets up inside the thermostated container.
Furthermore, the cooling device adopts a fin cooling pipe which is sleeved on the periphery of the gas trapping device.
Furthermore, a hot air outlet of the vortex tube is provided with a hot air temperature regulating valve, and a hot air opposite-air discharge valve and a hot air outlet shutoff valve are sequentially arranged on the hot air pipeline.
Further, sampling rifle annular intermediate layer inner wall is provided with the helical plate structure to set up with the laminating of sampling rifle outer wall.
Further, the sampling gun is provided with a flange for connecting with a flue.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the novel dioxin sampling device provided by the invention, the requirement on a site power supply is reduced by utilizing the fact that a vortex tube has no moving part, meanwhile, compressed air is used as power by combining more valves in a boiler site, a sampling gun annular interlayer sleeved in a tail section inner cavity of a sampling gun outside a flue is introduced, temperature regulation is carried out on sampling flue gas, compressed air interfaces are reserved at multiple parts of a hearth and the flue, the advantages of convenience in taking and use are achieved, rapid refrigeration and heating can be realized without a refrigerant and the like, a heating device, a refrigerator and accessory equipment of the dioxin sampling device in the prior art are omitted, and the reliability, portability and adaptability of the arrangement of the dioxin sampling device are improved.
Further, the annular interlayer of the sampling gun adjusts the temperature of the sampling gun through cold and hot air in the vortex tube, so that the temperature of the flue gas is reduced to a temperature range in which the filter cylinder normally works.
Furthermore, a pitot tube and a thermocouple are arranged at the end part of the sampling gun and used for monitoring the pressure and the temperature of the flue gas and providing reference for controlling the temperature of the flue gas in the annular interlayer of the sampling gun.
Furthermore, signals of the micro-pressure meter, the thermocouple thermometer and the flow measurement point are respectively introduced into the terminal, and a control instruction is sent to the variable-frequency air pump after the analysis and calculation of the terminal for the accurate control of the sampling flow.
Further, sampling rifle annular intermediate layer inner wall is provided with the helical plate structure to set up with the outer wall laminating of sampling rifle, when cold and hot wind gets into sampling rifle annular intermediate layer space, form the motion mode that encircles the sampling rifle flow, can increase the heat transfer coefficient of insulating air and barrel inner wall, improve heat conversion efficiency.
Drawings
Fig. 1 is a schematic diagram of a dioxin sampling system in an embodiment of the present invention.
In the figure: the device comprises a pitot tube 2, a thermocouple 3, a sampling gun 4, a flue wall surface 5, a flange 6, a heat preservation hot air outlet 7, a sampling gun annular interlayer 8, a filter cylinder 9, a hot air to air discharge valve 10, a hot air temperature regulating valve 11, a compressed air interface 12, a cold air outlet 13, a hot air outlet shutoff valve 14, a cold air to barrel temperature regulating valve 15, a micro-pressure gauge 16, a thermocouple thermometer 17, a constant temperature box 18, a finned cooling tube 19, an air trapping device 20, a flowmeter 21, a flow regulating valve 22, a variable frequency air suction pump 23, a terminal 24, a vortex tube 25 and a hot air outlet 26.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
The invention relates to a dioxin sampling system, as shown in figure 1, which comprises a sampling gun 4, a vortex tube 25 and a gas trapping device 20; the tail end of the sampling gun 4 is sequentially connected with a filter cylinder 9 and an air trapping device 20, and a sampling gun annular interlayer 8 is sleeved on the tail section of the outer side of a flue of the sampling gun 4 and the periphery of the filter cylinder 9 to form a sampling gun annular interlayer space; a cooling device is arranged outside the gas trapping device 20; the input end of the vortex tube 25 is connected with compressed air, the hot air outlet 26 is connected with one end of the filter cartridge 9 in the annular interlayer space of the sampling gun through a hot air pipeline, and the cold air outlet 13 is connected with a cooling device. Specifically, solid-phase particles in the flue gas are collected by the filter cartridge 9, and a gas phase is introduced into the gas collection device 20; meanwhile, the type of the vortex tube 25 is selected such that the pressure of a compressed air inlet is 0.4-0.7 Mpa, the temperature of a cold air outlet 13 is reduced by 20-45 ℃ compared with the temperature of the compressed air at the inlet of the vortex tube 25, and the temperature of a hot air outlet 26 is 125 ℃ at most.
Preferably, the air conditioning outlet 13 of vortex tube 25 still is provided with the hot-blast pipeline confluence of the air conditioning branch road and hot-blast outlet 26 of the same kind and inserts sampling rifle annular interlayer space, realize the cold and hot wind that can insert vortex tube 25 in sampling rifle annular interlayer space, a temperature for adjusting the sampling flue gas, wherein, 8 inner walls of sampling rifle annular interlayer are provided with the helical plate structure, and set up with the outer wall laminating of sampling rifle 4, when cold and hot wind gets into sampling rifle annular interlayer space, form the motion mode that flows around sampling rifle 4, can increase the heat transfer coefficient of heat preservation wind and barrel inner wall, improve thermal conversion efficiency.
In a preferred embodiment provided by the invention, a heat-preservation hot air outlet 7 is arranged at one end of the sampling gun annular interlayer 8, which is far away from the filter cylinder 9, and specifically, after cold and hot air of the vortex tube 25 enters the sampling gun annular interlayer 8 through the compressed air interface 12, the cold and hot air firstly passes through the filter cylinder 9 and then is discharged through the heat-preservation hot air outlet 7, so that the heat conversion time of the cold and hot air for adjusting the temperature of flue gas in the sampling gun annular interlayer 8 is prolonged.
Another preferred embodiment provided by the invention is that a pitot tube 2 and a thermocouple 3 are arranged on the lower side of the tip of the end part of the sampling gun 4, the output end of the pitot tube 2 is connected with a micro-pressure meter 16, the output end of the thermocouple 3 is connected with a thermocouple thermometer 17, specifically, the pitot tube 2 and the thermocouple 3 can be arranged close to the tip of the end part of the sampling gun 4, wherein the pitot tube 2 is used for measuring the total pressure and the static pressure of the flue gas flow at the tip of the end part of the sampling gun 4 to determine the gas flow velocity and feeding back the gas flow velocity to the micro-pressure meter 16, and the thermocouple 3 is used for measuring the temperature at the tip of the end part of the sampling gun 4 and feeding back to the thermocouple thermometer 17.
Another preferred embodiment of the present invention is that a thermostat 18 is provided outside the gas trapping device 20 and the cooling device; specifically, the cooling device can adopt a fin cooling tube 19, the fin cooling tube 19 is sleeved on the periphery of the gas trapping device 20, a cold air outlet 13 of the vortex tube 25 is connected to the fin cooling tube 19 and used for cooling the flue gas to be measured, and fins in the fin cooling tube can enhance the cooling effect and improve the heat absorption efficiency; at the same time, oven 18 provides a stable environment for subsequent testing accuracy.
Another preferred embodiment provided by the invention is that the system is provided with a flange 6 for connecting with a flue; meanwhile, the pitot tube 2 and the thermocouple 3 are fixedly arranged on the wall surface 5 of the flue through a flange 6, and the flange is extremely convenient to mount and dismount and is convenient to arrange on the wall surface 5 of the flue.
Another preferred embodiment provided by the invention is that a cold air outlet 13 of the vortex tube 25 is connected to the tail part of the sampling gun 4 through a hot air outlet shutoff valve 14, meanwhile, a hot air outlet 26 of the vortex tube 25 is provided with a hot air temperature regulating valve 11, and a hot air pipeline of the hot air outlet 26 is sequentially provided with a hot air opposite air discharge valve 10 and a hot air outlet shutoff valve 14; specifically, compressed air enters the vortex tube 25 through the compressed air interface 12, generated cold air is introduced into the fin cooling tube 19 through the cold air outlet 13, hot air is merged with cold air in a cold air branch through the hot air outlet 26, the merged cold air is introduced into the interlayer annular space 8 of the sampling gun 4 through a hot air pipeline for temperature adjustment, and the mixed cold air is discharged through the heat-insulation hot air outlet 7.
Specifically, the source of the compressed air can be instrument compressed air or plant compressed air in a plant area.
Another preferred embodiment provided by the present invention is that the output end of the gas trapping device 20 is sequentially connected to a flow meter 21 and a variable frequency air pump 23, and a flow regulating valve 22 is arranged between the flow meter 21 and the variable frequency air pump 23, wherein the flow regulating valve 22 can be automatically controlled to assist the variable frequency air pump 23 to accurately control the air pumping flow; the output ends of the micro-pressure meter 16, the thermocouple thermometer 17 and the flowmeter 21 are connected to a terminal 24, the output end of the terminal 24 is connected to a variable-frequency air pump 23, and specifically, the terminal 24 can be a microcomputer.
The above-mentioned contents only illustrate the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A dioxin sampling system is characterized by comprising a sampling gun (4), a vortex tube (25) and an air trapping device (20);
the tail end of the sampling gun (4) is sequentially connected with a filter cylinder (9) and an air trapping device (20);
a sampling gun annular interlayer (8) is sleeved on the tail section of the sampling gun (4) and the periphery of the filter cylinder (9) to form a sealed sampling gun annular interlayer space;
the vortex tube (25) is provided with a compressed air interface (12) for accessing compressed air, a hot air outlet (26) is accessed to one end of a filter cartridge (9) in the annular interlayer space of the sampling gun through a hot air pipeline, and a cold air outlet (13) is accessed to a cooling device arranged outside the air trapping device (20).
2. The dioxin sampling system according to claim 1, wherein the cold air outlet (13) is further provided with a cold air branch that merges with a hot air line.
3. The dioxin sampling system according to claim 1, wherein the end of the annular sandwich layer (8) of the sampling gun, which is far from the filter cartridge (9), is provided with a heat-insulating hot air outlet (7).
4. The dioxin sampling system according to claim 1, characterized in that a pitot tube (2) and a thermocouple (3) are arranged on the lower side of the tip of the sampling gun (4), the output end of the pitot tube (2) is connected with a micro-manometer (16), and the output end of the thermocouple (3) is connected with a thermocouple thermometer (17).
5. The dioxin sampling system according to claim 1, wherein the output end of the gas trap device (20) is connected with a flowmeter (21) and a variable-frequency air pump (23) in sequence; the output ends of the micro-pressure meter (16), the thermocouple thermometer (17) and the flow meter (21) are connected into a terminal (24), and the output end of the terminal (24) is connected into a variable-frequency air pump (23).
6. The dioxin sampling system according to claim 1, further comprising an oven (18), and the cooling means is provided inside the oven (18).
7. The dioxin sampling system according to claim 1 or 6, wherein the cooling means employs finned cooling tubes (19), and the finned cooling tubes (19) are fitted around the outer periphery of the gas trap device (20).
8. The dioxin sampling system according to claim 1, wherein the hot air outlet (26) of the vortex tube (25) is provided with a hot air temperature regulating valve (11), and a hot air to air exhaust valve (10) and a hot air outlet shutoff valve (14) are sequentially provided on the hot air line.
9. The dioxin sampling system according to claim 1, wherein the inner wall of the annular interlayer (8) of the sampling gun is provided with a spiral plate structure and is attached to the outer wall of the sampling gun (4).
10. A dioxin sampling system according to claim 1, characterized in that the sampling gun (4) is provided with a flange (6) for connection with a flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111051223.7A CN113740121A (en) | 2021-09-08 | 2021-09-08 | Dioxin sampling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111051223.7A CN113740121A (en) | 2021-09-08 | 2021-09-08 | Dioxin sampling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113740121A true CN113740121A (en) | 2021-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111051223.7A Pending CN113740121A (en) | 2021-09-08 | 2021-09-08 | Dioxin sampling system |
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| Country | Link |
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| CN (1) | CN113740121A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117705517A (en) * | 2023-12-08 | 2024-03-15 | 河北易高生物燃料有限公司 | Temperature-adjustable sampling system for measuring heavy metal content of flue gas and control method thereof |
-
2021
- 2021-09-08 CN CN202111051223.7A patent/CN113740121A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117705517A (en) * | 2023-12-08 | 2024-03-15 | 河北易高生物燃料有限公司 | Temperature-adjustable sampling system for measuring heavy metal content of flue gas and control method thereof |
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