Degassing device and dust monitoring equipment for optical dust monitors

Abstract

The present invention provides a degassing device and dust monitoring equipment for an optical dust monitor, comprising: a detection chamber, provided with an air inlet and an air outlet arranged opposite each other; a detection chamber cover disposed at the periphery of a gas detection area, defining the gas detection area's fully open structure as a semi-enclosed structure; and a heating vaporization tube, wherein two ports extending along the heating vaporization tube are respectively an air outlet port and a gas collection port, and the air outlet port is connected to the air inlet. The overall structure of the present invention is simple and can eliminate the influence of water vapor in the measured gas on dust measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of dust monitoring, and in particular to a degassing device for an optical dust monitor and dust monitoring equipment. Background Art

[0002] Laser forward scattering dust monitor is a dust monitoring device widely used in the field of environmental protection. However, its measurement results will be seriously interfered by water vapor.

[0003] To address this problem, the industry currently offers two main technical solutions: high-temperature heating and dilution. Both of these solutions are based on extraction methods and require complex fan systems, heating controls, and monitoring systems. These systems are complex, bulky, and expensive, and also present various challenges with isokinetic sampling.

[0004] The in-situ laser forward scattering dust monitor on the market has a simple system and is inexpensive, but can only be used in dry flue gas environments. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a degassing device and dust monitoring equipment for an optical dust meter, which has a simple overall structure and can eliminate the influence of water vapor in the measured gas on dust measurement.

[0006] In order to solve the above technical problems, the present invention provides a degassing device for an optical dust monitor, wherein the optical dust monitor includes a probe rod having a gas detection area with a fully open structure. The degassing device includes:

[0007] The detection chamber is provided with an air inlet and an exhaust port arranged opposite to each other, and the detection chamber cover is arranged at the periphery of the gas detection area, defining the fully open structure of the gas detection area into a semi-enclosed structure;

[0008] The heating gasification pipe has two ports in the extension direction thereof, namely a gas outlet port and a gas collection port, and the gas outlet port is connected to the gas inlet port.

[0009] Preferably, the detection chamber is tubular, and two ends of the detection chamber in the extension direction are sleeved on the probe rod.

[0010] Preferably, the heating vaporization tube includes a heat-insulating tube and a water vapor heater, the heat-insulating tube is connected to the detection chamber, and the water vapor heater is arranged in the heat-insulating tube.

[0011] Preferably, the water vapor heater includes a uniform heat conductive member and a heating element, one of the uniform heat conductive member and the insulation tube is connected to the detection chamber, the uniform heat conductive member is arranged in the insulation tube, and the heating element is arranged between the insulation tube and the uniform heat conductive member.

[0012] Preferably, the uniform heat conducting member and the heating element are both tubular, and the uniform heat conducting member, the heating element and the heat insulating tube are concentrically arranged in sequence from the inside to the outside.

[0013] Preferably, the detection chamber is made of metal material, is welded to the heat-distributing member, and is indirectly connected to the probe rod via a heat insulating member.

[0014] Preferably, the degassing device further includes a temperature sensor and a controller. The temperature sensor is provided on the heating and vaporizing pipe, and the controller is communicatively connected to the heating and vaporizing pipe and the temperature sensor respectively.

[0015] Preferably, the temperature sensor is embedded in the heating gasification tube.

[0016] Preferably, a mounting groove is provided on the heating gasification tube, and the temperature sensor is located in the mounting groove and adhered to the heating gasification tube via thermally conductive adhesive.

[0017] The present invention also provides a dust monitoring device, comprising an optical dust monitor and the degassing device for the optical dust monitor.

[0018] As described above, the degassing device and dust monitoring equipment for an optical dust monitor of the present invention have the following beneficial effects: the detection chamber cover is arranged at the periphery of the gas detection area, defining the fully open structure of the gas detection area into a semi-enclosed structure, and the gas outlet port of the heating vaporization tube is connected to the gas inlet of the detection chamber. With this arrangement, when the measured gas flows through the heating vaporization tube, the heating vaporization tube heats the measured gas, vaporizing the water vapor in the measured gas, thereby eliminating the effect of the water vapor in the measured gas on dust measurement. Therefore, the degassing device for an optical dust monitor of the present invention has a simple overall structure, can eliminate the effect of water vapor in the measured gas on dust measurement, and enables the optical dust monitor to be applied in the field of wet flue gas monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a perspective view of the optical dust monitor of the present invention;

[0020] Figure 2 Shown is a perspective view of the dust monitoring device of the present invention;

[0021] Figure 3 Shown is a perspective view of a degassing device for an optical dust monitor;

[0022] Figure 4 Shown is a perspective view of the inspection chamber;

[0023] Figure 5 Shown is a front view of a heat dissipating and conducting member;

[0024] Figure 6 Shown is a connection diagram of the heated vaporization tube, temperature sensor, and controller.

[0025] Component number description

[0026] 1 Optical dust monitor

[0027] 11 Probe

[0028] 12 Gas detection area

[0029] 2 Inspection Chamber

[0030] 21 Air Inlet

[0031] 22 Exhaust port

[0032] 3 Heating gasification tube

[0033] 31 Insulated pipe

[0034] 32 Steam Heater

[0035] 321 Heat Distributing Parts

[0036] 322 heating element

[0037] 33 outlet port

[0038] 34 Gas collection port

[0039] 4 Temperature Sensors

[0040] 5 Controller DETAILED DESCRIPTION

[0041] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0042] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0043] Figure 1 In the figure, direction A is the flow direction of the gas being measured (such as smoke and exhaust gas).

[0044] like Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 As shown, the present invention provides a degassing device for an optical dust monitor. The optical dust monitor 1 includes a probe rod 11, and a gas detection area 12 with a fully open structure is opened on the probe rod 11. The degassing device includes:

[0045] The detection chamber 2 is provided with an air inlet 21 and an air outlet 22 arranged opposite to each other. The detection chamber 2 is covered at the periphery of the gas detection area 12, defining the fully open structure of the gas detection area 12 into a semi-enclosed structure;

[0046] The heating gasification pipe 3 has two ports in the extending direction thereof, namely a gas outlet port 33 and a gas collection port 34 , and the gas outlet port 33 is connected to the gas inlet port 21 .

[0047] In the present invention, the detection chamber 2 is covered at the periphery of the gas detection area 12, defining the fully open structure of the gas detection area 12 as a semi-enclosed structure, and the gas outlet port 33 of the heating gasification tube 3 is connected to the gas inlet 21 of the detection chamber 2. With such an arrangement, when the gas to be measured (such as flue gas) flows through the heating gasification tube 3, the heating gasification tube 3 heats the gas to be measured, vaporizing the water vapor in the gas to be measured, thereby eliminating the influence of the water vapor in the gas to be measured on the dust measurement. Therefore, the degassing device for the optical dust meter of the present invention has a simple overall structure, can eliminate the influence of the water vapor in the gas to be measured on the dust measurement, and enables the optical dust meter to be applied to the field of wet flue gas monitoring.

[0048] like Figure 4 As shown, in order to facilitate the assembly of the detection chamber 2 on the probe rod 11, the detection chamber 2 is tubular, and the two ends of the detection chamber 2 in the extension direction are sleeved on the probe rod 11. Furthermore, the ends of the detection chamber 2 are fixed to the probe rod 11 by connecting members (such as screws).

[0049] like Figure 3 As shown, to improve the vaporization degree of water vapor, the heating vaporization tube 3 includes an insulated tube 31 and a water vapor heater 32. The insulated tube 31 is connected to the detection chamber 2, and the water vapor heater 32 is disposed within the insulated tube 31. The insulated tube 31 prevents the heat within the heating vaporization tube 3 from dissipating into the surrounding environment, thereby completely vaporizing the water vapor in the gas being measured.

[0050] like Figure 4 and Figure 5As shown, in order to simplify the structure of the water vapor heater 32, the water vapor heater 32 includes a uniform heat conductor 321 and a heating element 322. One of the uniform heat conductor 321 and the insulation tube 31 is connected to the detection chamber 2. The uniform heat conductor 321 is arranged in the insulation tube 31, and the heating element 322 is arranged between the insulation tube 31 and the uniform heat conductor 321. The uniform heat conductor 321 can evenly transfer the heat emitted by the heating element 322 to the gas being measured, thereby effectively vaporizing the water vapor in the gas being measured. The heating element 322 can be one of a heating wire, a heating mica, a heating rod, and a thermocouple.

[0051] To evenly heat the gas being measured, the uniform heat conducting member 321 and the heating element 322 are both tubular, with the uniform heat conducting member 321, the heating element 322, and the insulating tube 31 being concentrically arranged from the inside out. Furthermore, the inner wall of the uniform heat conducting member 321 is smooth, which prevents dust from adhering to the uniform heat conducting member 321.

[0052] To further maintain the temperature of the gas detection area 12 above the ambient temperature, the detection chamber 2 is made of metal, welded to a uniform heat conductor 321, and indirectly connected to the probe 11 via a thermal insulator. This further eliminates the effect of moisture in the measured gas on dust measurement. The thermal insulator (e.g., asbestos insulation) prevents heat from the detection chamber 2 from being transferred to the probe 11, ensuring its proper operation.

[0053] like Figure 6 As shown, to control the heating temperature of the measured gas, the degassing device further includes a temperature sensor 4 and a controller 5. The temperature sensor 4 is disposed on the heating vaporization tube 3, and the controller 5 is communicatively connected to the heating vaporization tube 3 and the temperature sensor 4, respectively. The heating temperature control logic can utilize a conventional PID temperature control algorithm. The controller 5 can be an ARM processor, an FPGA, an MCU, or a PLC.

[0054] In order to improve the sensitivity of the temperature sensor 4, the temperature sensor 4 is embedded in the heating and vaporizing tube 3. Furthermore, the heating and vaporizing tube 3 is provided with a mounting groove, and the temperature sensor 4 is located in the mounting groove and adhered to the heating and vaporizing tube 3 via a thermally conductive adhesive (e.g., thermally conductive silicone).

[0055] As a manufacturing process of the above-mentioned degassing device:

[0056] The above-mentioned detection chamber 2 is made of stainless steel (such as 316L), and its surface is shot peened to release residual stress after welding.

[0057] The uniform heat conductor 321 is fixed to the detection chamber 2 by spot welding, and conducts the heat generated by the heating element 322 to the gas under test in the gas detection area 12. The uniform heat conductor 321 is made of brass, with a thermal conductivity of 400 W / (m·K) and a temperature resistance of 1083°C.

[0058] The stainless steel inspection chamber 2 and the brass heat-distributing conductive element 321 are connected using welding technology. In the brass and stainless steel welding process, silver fiber is used as a filler. The copper material is first heated to a predetermined temperature, allowing the silver fiber to adhere. The welding torch is then swung toward the stainless steel to achieve the desired weld.

[0059] The present invention also provides a dust monitoring device, comprising an optical dust monitor and a degassing device for the optical dust monitor. The optical dust monitor can be a laser dust monitor, and further, can be a laser forward scattering dust monitor.

[0060] As a specific technical effect of the above-mentioned degassing device for optical dust monitor:

[0061] When the water vapor percentage of the flue gas (that is, the percentage of the volume of water vapor in the wet-based flue gas to the total volume of the flue gas, measured in %) is as high as 20%, the temperature is controlled at 600°C. Since the flue gas flows through the heating vaporization tube 3 first, the water vapor in the flue gas is quickly vaporized. At the same time, the flue gas expands rapidly due to heat, forming local high pressure in the detection chamber 2, preventing the surrounding cold and wet flue gas from entering the gas detection area 12, and the smoke temperature in the gas detection area 12 can reach above 200°C, fully ensuring that there is no liquid water in the gas detection area 12, thereby avoiding the influence of wet flue gas on dust measurement.

[0062] In summary, the degassing device and dust monitoring equipment for an optical dust meter of the present invention have a simple overall structure and can eliminate the influence of water vapor in the measured gas on dust measurement. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A degassing device for an optical dust monitor, the optical dust monitor (1) comprising a probe (11), a gas detection area (12) in a fully open structure being provided on the probe (11), characterized in that: The degassing device comprises: A detection chamber (2) is provided with an air inlet (21) and an air outlet (22) arranged opposite to each other. The detection chamber (2) is covered at the periphery of the gas detection area (12), defining the fully open structure of the gas detection area (12) as a semi-enclosed structure. The detection chamber (2) is tubular, and two ends of the detection chamber (2) in the extension direction are sleeved on the probe rod (11). The detection chamber (2) is indirectly connected to the probe rod (11) through a heat insulating member. A heating vaporization pipe (3) is provided. Two ports in the extending direction of the heating vaporization pipe (3) are respectively an air outlet port (33) and an air collection port (34). The air outlet port (33) is connected to the air inlet (21). The heating vaporization pipe (3) comprises an insulation pipe (31) and a water vapor heater (32). The insulation pipe (31) is connected to the detection chamber (2). The water vapor heater (32) is arranged in the insulation pipe (31). The water vapor heater (32) comprises a uniform heat conduction member (321) and a heating element (322). The uniform heat conduction member (321) is arranged in the insulation pipe (31). The heating element (322) is arranged between the insulation pipe (31) and the uniform heat conduction member (321). The uniform heat conduction member (321) is connected to the detection chamber (2).

2. The degassing device for an optical dust monitor according to claim 1, characterized in that: The uniform heat conducting member (321) and the heating element (322) are both tubular, and the uniform heat conducting member (321), the heating element (322) and the heat insulating tube (31) are concentrically sleeved in sequence from the inside to the outside.

3. The degassing device for an optical dust monitor according to claim 2, characterized in that: The detection chamber (2) is made of metal material, is welded to the uniform heat conducting member (321), and is indirectly connected to the probe rod (11) via a heat insulating member.

4. The degassing device for an optical dust monitor according to claim 1, characterized in that: The degassing device further comprises a temperature sensor (4) and a controller (5); the temperature sensor (4) is arranged on the heating and gasification pipe (3); and the controller (5) is communicatively connected to the heating and gasification pipe (3) and the temperature sensor (4), respectively.

5. The degassing device for an optical dust monitor according to claim 4, characterized in that: The temperature sensor (4) is embedded in the heating and gasification tube (3).

6. The degassing device for an optical dust monitor according to claim 5, characterized in that: The heating and gasification pipe (3) is provided with a mounting groove, and the temperature sensor (4) is located in the mounting groove and is bonded to the heating and gasification pipe (3) via heat-conducting glue.

7. A dust monitoring device, characterized in that: The invention comprises an optical dust monitor and a degassing device for the optical dust monitor according to any one of claims 1 to 6.

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