Sampling probe protection device

Abstract

The utility model provides a sampling probe protection device which comprises a sampling probe rod, a heat tracing device is arranged on the periphery of the sampling probe rod, and a protection pipe is coaxially arranged outside the sampling probe rod; one end of the protection pipe is fixed to the chimney wall through the base, the other end of the protection pipe extends to the center of the chimney and is open, and the protection pipe inclines downwards at a certain angle with the chimney wall. One end of the sampling probe rod extends out of the protective tube; and the heat tracing device is arranged between the sampling probe rod and the protective tube. According to the protection device, the protection pipe inclining downwards is arranged, the sampling probe rod is coaxially arranged in the protection pipe, agglutination of water vapor in flue gas on the surface of the heat tracing device outside the sampling probe rod is reduced through the protection pipe, and the defects that due to the fact that the water content in the flue gas is too high and the water vapor is condensed outside the sampling probe rod, a heat tracing resistance wire insufficiently heats the probe rod, and the sampling probe rod cannot be heated sufficiently are overcome. And the measurement result is not stable.

Description

Technical Field

[0001] This application relates to the technical field of flue gas sampling, and particularly to a sampling probe protection device. Background Art

[0002] A Continuous Emission Monitoring System (CEMS) is a continuous automatic monitoring and metering analysis instrument installed at the exhaust gas discharge of polluting enterprises in response to the national pollution control and emission reduction policies to supervise and control the exhaust gas emissions of fixed pollution sources. This system mainly includes on-site flue gas measurement and sampling parts, sampling tracing pipeline parts, flue gas pretreatment parts, and data acquisition and processing parts. In actual production, after the sampling probe takes the gas sample, the sampled gas needs to be heated to completely vaporize the moisture in it, and ammonia, hydrogen chloride, etc. adsorbed in the water are completely released to reduce the measurement error. The existing method is to wind the tracing electric heating wire outside the sampling probe, so that the sampling probe can heat the sampled gas in time after taking the sample gas, preventing the water vapor from condensing on the inner wall of the sampling probe and causing inaccurate measurement data.

[0003] However, due to the large water content in the wet dust removal unit flue gas, this water vapor condenses on the outer wall of the heated probe. When the electric heating wire works, it will absorb a part of the heat. And the heating effect of the heated probe is limited. Under the influence of the moisture on the outer wall, it is impossible to completely heat the sampled gas in the pipe, resulting in unstable measurement parameters. In severe cases, the environmental protection data exceeds the standard. Utility Model Content

[0004] This application provides a sampling probe protection device to solve the problem that the excessive moisture content in the flue gas condenses outside the sampling probe, resulting in insufficient heating of the probe by the tracing resistance wire and unstable measurement results.

[0005] This application provides a sampling probe protection device, including a sampling probe. A tracing device is arranged on the outer periphery of the sampling probe, and a protection tube is coaxially arranged outside the sampling probe;

[0006] One end of the protection tube is fixed to the chimney wall through a base, and the other end extends into the center of the chimney and is open. And the protection tube is arranged obliquely downward at a certain angle with the chimney wall;

[0007] The sampling probe passes through the base and one end extends out of the protection tube;

[0008] The tracing device is arranged between the sampling probe and the protection tube.

[0009] Optionally, the tracing device includes a tracing resistance wire wound around the outer periphery of the sampling probe and a heat insulation layer wrapped outside the tracing resistance wire.

[0010] Optionally, an end cover is further arranged at the open end of the protection tube;

[0011] The cover surface of the end cap is a hollow structure, and a filter screen is arranged inside the cover surface; the sampling probe rod passes through the end cap and the filter screen;

[0012] The end cap and the protection tube are detachably connected.

[0013] Optionally, an opening is provided at a position on the side of the protection tube close to the base and is connected to a fan through an air duct;

[0014] The air duct passes through the chimney wall and is connected to a fan arranged outside the chimney.

[0015] Optionally, the air duct is spirally wound around the outer periphery of the protection tube.

[0016] Optionally, the heat insulation layer includes an outer protective shell and a heat-reflective inner lining close to the tracing resistance wire;

[0017] Heat insulation material is filled between the protective shell and the heat-reflective inner lining:

[0018] The heat insulation material is glass fiber, asbestos, rock wool, phenolic foam plastic or polyurethane foam plastic, and the heat-reflective inner lining is aluminum foil or a metal-coated polyester, polyimide film, etc.

[0019] Optionally, the angle at which the protection tube slopes downward is 5 to 30°.

[0020] The sampling probe protection device provided by the present application, by setting a protection tube that slopes downward and coaxially arranging the sampling probe rod inside the protection tube, reduces the condensation of water vapor in the flue gas on the surface of the tracing device outside the sampling probe rod, overcomes the drawback that excessive moisture content in the flue gas condenses outside the sampling probe rod, resulting in insufficient heating of the probe by the tracing resistance wire and unstable measurement results. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a sampling probe protection device provided by an embodiment of the present application;

[0023] Figure 2 It is a schematic side view structural diagram of a sampling probe protection device provided by an embodiment of the present application;

[0024] Figure 3 It is a schematic cross-sectional structural diagram of a tracing device provided by an embodiment of the present application;

[0025] Figure 4 Schematic structural diagram of the end cap provided by an embodiment of the present application;

[0026] Figure 5 Schematic structural diagram of the sampling probe protection device provided by another embodiment of the present application.

[0027] Explanation of reference numerals:

[0028] 1. Sampling probe rod; 2. Heating device; 3. Protection tube; 4. Base; 5. Air duct; 6. Fan; 21. Heating resistance wire; 22. Heat insulation layer; 31. End cap; 221. Protection shell; 222. Heat reflection inner lining. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts also belong to the scope of protection of the present application.

[0030] As Figure 1 and Figure 2 shown, the present application provides a sampling probe protection device, including a sampling probe rod 1. A heating device 2 is arranged on the outer periphery of the sampling probe rod 1, and a protection tube 3 is coaxially arranged outside the sampling probe rod 1;

[0031] One end of the protection tube 3 is fixed to the chimney wall through a base 4, and the other end extends into the center of the chimney and is open, and the protection tube 3 is arranged obliquely downward at a certain angle with the chimney wall;

[0032] The sampling probe rod 1 passes through the base 4 and one end extends out of the protection tube 3;

[0033] The heating device 2 is arranged between the sampling probe rod 1 and the protection tube 3.

[0034] In actual production, if one end of the protection tube 3 extending into the chimney is closed and only the sampling probe rod 1 passes through, during use, the pressure change in the protection tube 3 caused by the heating of the heating device 2 will cause deformation of the sampling probe rod 1 and the protection tube 3, affecting their service life. In addition, this closed setting is also not conducive to the maintenance of the heating device 2. Therefore, it must be set to be open. The protection tube 3 can be fixed to the inner wall or the outer wall of the chimney through the base 4.

[0035] In this application, the protective tube 3 is arranged obliquely downward, and the flue gas travels from bottom to top. Therefore, the water-containing flue gas entering the protective tube 3 collides with the inner wall of the protective tube 3, accelerating the condensation and aggregation of water vapor in the flue gas. In actual production, water will condense into droplets at a position about 20 cm from the front end of the protective tube 3 (i.e., the end far from the base 4) and then flow out.

[0036] The protective tube 3 is fixed to the inner wall of the chimney through the base 4 (when necessary, a support frame can be fixedly arranged on the outer periphery of the protective tube 3 to prevent the fracture of the protective tube 3). The base 4 is connected to the inner wall of the chimney by bolts. The protective tube 3 is arranged obliquely downward (such an arrangement not only facilitates the discharge of water condensed in the protective tube 3 but also facilitates the sampling probe 1 to take samples. The inclination angle is 5 - 30°). The sampling probe 1 passes through the inner wall of the chimney and the base 4, and the sampling probe 1 and the tracing device 2 are coaxially arranged in the protective tube 3 (there is a space between the tracing device 2 and the protective tube 3 to ensure the normal operation of each component and facilitate maintenance), and the sampling section of the sampling probe 1 extends out of the protective tube 3.

[0037] During use, the flue gas discharged into the chimney enters the sampling probe 1 through the air inlet hole at the end of the sampling probe 1 (the other end of the probe is connected to an air extraction device such as a vacuum pump, which can suck the flue gas in the chimney into the sampling probe 1). At the same time, the tracing device 2 is powered on to heat the sample gas in the sampling probe 1. The heated sample gas is introduced into the subsequent corresponding analysis equipment for component analysis.

[0038] During the working process, since one end of the protective tube 3 is in communication with the inside of the chimney and the protective tube 3 is arranged obliquely downward, it is inevitable that flue gas will enter the protective tube 3. The water vapor in the flue gas will condense when it enters the protective tube 3 (in actual application, water will condense at a distance of about 20 cm from the front end of the protective tube 3), thereby preventing the water vapor entering the protective tube 3 from adhering to the tracing device 2 and affecting its heating efficiency. Since the protective tube 3 is arranged obliquely, the condensed water obtained after condensation will drain out of the protective tube 3, thus preventing the condensed water from accumulating in the tube.

[0039] This application provides a sampling probe protection device. By setting the protective tube 3 obliquely downward and coaxially arranging the sampling probe 1 in the protective tube 3, the protective tube 3 reduces the condensation of water vapor in the flue gas on the surface of the tracing device 2 outside the sampling probe 1, overcoming the disadvantages that excessive moisture content in the flue gas condenses outside the sampling probe 1, resulting in insufficient heating of the probe by the tracing device 2 and unstable measurement results.

[0040] As Figure 3 shown, optionally, the tracing device 2 includes a tracing resistance wire 21 wound around the outer periphery of the sampling probe 1 and a heat insulation layer 22 wrapped outside the tracing resistance wire 21.

[0041] In this application, since a heat-insulating layer 22 is provided outside the tracing resistance wire 21, water vapor entering the protection tube 3 can be prevented from adhering to the tracing resistance wire 21, thus affecting its heating efficiency.

[0042] As Figure 4 shown, optionally, an end cover 31 is further provided at the open end of the protection tube 3;

[0043] The cover surface of the end cover 31 is a hollow structure, and a filter screen is provided on the inner side of the cover surface; the sampling probe 1 passes through the end cover 31 and the filter screen;

[0044] The end cover 31 and the protection tube 3 are detachably connected, such as by threaded connection, snap connection or plug connection.

[0045] In this application, when the flue gas enters the protection tube 3 through the end cover 31, the filter screen provided on the inner side of the end cover 31 can intercept some solid particles such as soot and water mist in the flue gas.

[0046] As Figure 5 shown, optionally, an opening is provided at a position on the side of the protection tube 3 close to the base 4 and is connected to a fan 6 through an air duct 5;

[0047] The air duct 5 passes through the chimney wall and is connected to a fan 6 provided outside the chimney.

[0048] In this application, the fan 6 introduces the outside air into the air duct 5 and blows it into the protection tube 3 through the air duct 5, which can make the inside of the protection tube 3 form a positive pressure, thereby preventing the flue gas in the chimney from entering the protection tube 3 and the fan 6.

[0049] During use, the flow rate of the air introduced into the protection tube 3 can be adjusted to be slightly greater than the flow rate of the flue gas flowing into the protection tube 3, so as to prevent the flow rate of the gas blown out of the protection tube 3 from being too large, and the gas blown out of the protection tube 3 is collected by the sampling probe 1, thus affecting the accuracy of the sampling of the sampling probe 1. Moreover, since the end of the protection tube 3 is provided with an end cover 31 and a filter screen, the flow rate of the blown-out gas can be slowed down. The reverse blowing air introduced by the fan 6 can prevent the flue gas in the chimney from entering the protection tube 3. In a feasible way, a 90° elbow is provided at the end of the protection tube 3 far from the base 4, and the sampling probe 1 passes through the bent part of the elbow. In this way, the air discharged from the protection tube 3 can be discharged through the elbow, which can prevent the air flow blown out of the protection tube 3 from affecting the sampling of the sampling probe 1. The elbow is preferably oriented towards the side.

[0050] As Figure 5 shown, optionally, the air duct 5 is spirally wound around the outer periphery of the protection tube 3.

[0051] In this application, the air duct 5 is spirally wound around the outer periphery of the protection pipe 3, and the heat of the flue gas can be used to preheat the air in the air duct 5, avoiding too low temperature of the air entering the air duct 5 and affecting the heating efficiency of the tracing device 2 for the sampling probe 1.

[0052] As Figure 3 shown, optionally, the heat insulation layer 22 includes an outer protective shell 221 and a heat-reflecting inner lining 222 closely attached to the tracing resistance wire 21;

[0053] Heat insulation material is filled between the protective shell 221 and the heat-reflecting inner lining 222:

[0054] The heat insulation material is glass fiber, asbestos, rock wool, phenolic foam plastic or polyurethane foam plastic, and the heat-reflecting inner lining 222 is aluminum foil or metal-coated polyester, polyimide film, etc.

[0055] In this application, the heat insulation material can reduce the dissipation of the heat generated by the tracing resistance wire 21, thus saving electric energy.

[0056] The heat-reflecting inner lining 222 of the heat insulation layer 22 can reflect the heat generated by the tracing resistance wire 21, so the thermal efficiency of the tracing resistance wire 21 can be further improved.

[0057] Optionally, the downward inclination angle of the protection pipe 3 is 5-30°.

[0058] In this application, the protection pipe 3 is arranged to incline downward at an angle of 5-30°. This arrangement not only facilitates the drainage of the water condensed in the protection pipe 3, but also facilitates the sampling of the sampling probe 1.

[0059] A sampling probe protection device has the following usage process:

[0060] Fix the protection pipe 3 on the inner wall of the chimney through the base 4 (when necessary, a support frame can be fixedly arranged on the outer periphery of the protection pipe 3 to prevent the protection pipe 3 from breaking). The base 4 is connected to the inner wall of the chimney by bolts. The protection pipe 3 is arranged to incline downward at an angle of 5-30° (this arrangement not only facilitates the drainage of the water condensed in the protection pipe 3, but also facilitates the sampling of the sampling probe 1). Pass the sampling probe 1 through the inner wall of the chimney and the base 4, and coaxially arrange the sampling probe 1 and the tracing device 2 in the protection pipe 3 (there is a space between the tracing device 2 and the protection pipe 3 to ensure the normal operation of each component and facilitate maintenance). Then cover the end cover 31 on the end of the protection pipe 3, and the sampling section of the sampling probe 1 extends out of the end cover 31.

[0061] During use, the flue gas discharged into the chimney enters the sampling probe 1 through the air inlet hole at the end of the sampling probe 1 (the other end of the probe is connected to an air extraction device such as a vacuum pump, which can suck the flue gas in the chimney into the sampling probe 1). At the same time, the heating resistance wire 21 is energized. After the heating resistance wire 21 is energized, it generates heat to heat the sample gas in the sampling probe 1. Since the heat insulation layer 22 is provided outside the heating resistance wire 21, it can prevent the water vapor entering the protection tube 3 from adhering to the heating resistance wire 21 and affecting its heating efficiency. Moreover, the heat-reflecting lining 222 of the heat insulation layer 22 can reflect the heat generated by the heating resistance wire 21, thus further improving the thermal efficiency of the heating resistance wire 21.

[0062] The heated sample gas is introduced into the subsequent corresponding analysis equipment for component analysis.

[0063] During the working process, since one end of the protection tube 3 is in communication with the chimney and the protection tube 3 is inclined downward, inevitably, some flue gas will enter the protection tube 3 through the hollow holes on the end cover 31. When the flue gas passes through the end cover 31 and enters the protection tube 3, the filter screen provided on the inner side of the end cover 31 can intercept some solid particles such as soot and water mist in the flue gas. Some of the water vapor that fails to be intercepted enters the protection tube 3 and will condense. Since the protection tube 3 is inclined, the condensed water obtained after condensation will drain from the protection tube 3, thus preventing the condensed water from accumulating in the tube.

[0064] When the water vapor content in the flue gas is relatively high, the fan 6 can be turned on to blow air into the air duct 5. The air duct 5 is spirally wound around the outer periphery of the protection tube 3, and the heat of the flue gas can be used to preheat the air in the air duct 5. The preheated air is introduced into the protection tube 3 through the opening near the base 4 of the protection tube 3 and blown out. During use, the flow rate of the air introduced into the protection tube 3 can be adjusted to be slightly greater than the flow rate of the flue gas flowing into the protection tube 3 to prevent the flow rate of the gas blown out of the protection tube 3 from being too large, so that the gas blown out of the protection tube 3 is collected by the sampling probe 1, thus affecting the sampling accuracy of the sampling probe 1. Moreover, since the end of the protection tube 3 is provided with an end cover 31 and a filter screen, the flow rate of the blown-out gas can be slowed down. The reverse blowing air introduced by the fan 6 can prevent the flue gas in the chimney from entering the protection tube 3. In an implementable manner, a 90° elbow is provided at the end of the protection tube 3, and the sampling probe 1 passes through the bent part of the elbow. In this way, the air discharged from the protection tube 3 can be discharged through the elbow, and the elbow is preferably oriented towards the side.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sampling probe protection device, comprising a sampling probe rod (1), wherein a heat tracing device (2) is arranged on the outer periphery of the sampling probe rod (1), and is characterized in that, A protective tube (3) is coaxially arranged outside the sampling probe rod (1). One end of the protective tube (3) is fixed to the chimney wall through a base (4), the other end extends towards the center of the chimney and is open, and the protective tube (3) is arranged obliquely downward at a certain angle with the chimney wall. The sampling probe rod (1) passes through the base (4) and one end extends out of the protective tube (3). The tracing device (2) is arranged between the sampling probe rod (1) and the protective tube (3).

2. The sampling probe protection device according to claim 1, wherein The tracing device (2) includes a tracing resistance wire (21) wound around the outer periphery of the sampling probe rod (1) and a heat insulation layer (22) wrapped outside the tracing resistance wire (21).

3. The sampling probe protection device according to claim 1, wherein An end cover (31) is further arranged at the open end of the protective tube (3). The cover surface of the end cover (31) is a hollow structure, and a filter screen is arranged on the inner side of the cover surface; the sampling probe rod (1) passes through the end cover (31) and the filter screen. The end cover (31) and the protective tube (3) are detachably connected.

4. The sampling probe protection device according to claim 1, characterized in that, An opening is provided at a position on the side of the protective tube (3) close to the base (4) and is connected to a blower (6) through an air duct (5). The air duct (5) passes through the chimney wall and is connected to a blower arranged outside the chimney.

5. The sampling probe protection device according to claim 4, wherein, The air duct (5) is spirally wound around the outer periphery of the protective tube (3).

6. The sampling probe protection device according to claim 2, characterized in that The heat insulation layer (22) includes an outer protective shell (221) and a heat reflection lining (222) closely attached to the tracing resistance wire (21). Heat insulation materials are filled between the protective shell (221) and the heat reflection lining (222). The heat insulation materials are glass fiber, asbestos, rock wool, phenolic foam plastic or polyurethane foam plastic; the heat reflection lining (222) is aluminum foil or metallized polyester.

7. The sampling probe protection device according to any one of claims 1 to 6, characterized in that, The downward inclination angle of the protective tube (3) is 5 to 30°.

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