An industrial furnace high-temperature flue gas detection device

Abstract

The utility model discloses an industrial furnace high temperature flue gas detection device belongs to flue gas detection technical field, including sampling pipeline, the sampling pipeline includes the connecting section and sampling section of being connected, the connecting section is used for connecting the flue gas pipeline, the sampling section is close to the side of connecting section and is provided with annular pipeline, and annular pipeline connects water supply equipment, and its inside flows cooling water, annular pipeline is located around the outer wall or inner wall of sampling section and extends along the axial direction of sampling section, annular pipeline is connected with atomizing spray head, and the nozzle of atomizing spray head is located in the inside of sampling section, the side of sampling section away from connecting section is provided with sampling mouth, and the sampler is put into sampling. The utility model discloses through annular pipeline cooperation atomizing spray head and increases the heat exchange area, avoids the situation that the local quenching caused by traditional injection assembly direct injection leads to the pipe material thermal stress cracking.

Description

Technical Field

[0001] This utility model relates to the field of flue gas detection technology, and more specifically, to a high-temperature flue gas detection device for industrial furnaces and kilns. Background Technology

[0002] According to laws and regulations, polluting enterprises are required to conduct regular self-environmental monitoring. Industries such as chemical, metal smelting, and food processing often face high flue gas temperatures (usually close to 300℃), while most testing agencies on the market are equipped with particulate matter samplers that can only conduct continuous sampling at temperatures below 180℃. Therefore, there is a problem that flue gas testing cannot be carried out using currently available mainstream instruments.

[0003] Air pollutant detection requires calculating pollutant concentrations under specific operating conditions based on emission requirements. To enable continuous sampling, existing technologies typically involve cooling the flue gas. For example, conventional processes use spray towers to cool the flue gas before testing; however, the construction and operation costs of such spray towers are high, making them unaffordable for many companies.

[0004] For example, Chinese patent document CN210740446U discloses a flue gas quencher, which includes a quenching liquid injection assembly, an air inlet pipe, a mixing throat, and a diffuser. The air inlet pipe and the diffuser are installed at the upper and lower ends of the mixing throat, and the quenching liquid injection assembly is installed on the mixing throat. The quenching liquid injection assembly sprays quenching liquid into the inner cavity of the mixing throat through the side wall of the mixing throat.

[0005] However, the quenching liquid injection assembly in the aforementioned patent documents injects quenching liquid into the inner cavity of the mixing throat, which can cause localized sudden cooling of the pipe wall and may lead to thermal stress cracking of the pipe material. Utility Model Content

[0006] The purpose of this invention is to provide a high-temperature flue gas detection device for industrial furnaces and kilns, which solves the problem in the prior art where the injection of quenching liquid into the mixing throat cavity by the quenching liquid injection component causes localized sudden cooling of the pipe wall, which may lead to thermal stress cracking of the pipe material.

[0007] To achieve the above objectives, this utility model provides a high-temperature flue gas detection device for industrial furnaces and kilns, including a sampling pipe. The sampling pipe includes a connecting section and a sampling section connected together, and the connecting section is used to connect to the flue gas pipe.

[0008] A ring-shaped pipe is provided on the side of the sampling section near the connecting section. The ring-shaped pipe is connected to a water supply device and cooling water flows inside it. The ring-shaped pipe is arranged around the outer or inner wall of the sampling section and extends along the axial direction of the sampling section. An atomizing nozzle is connected to the ring-shaped pipe, and the nozzle of the atomizing nozzle is located inside the sampling section.

[0009] The sampling section has a sampling port on the side away from the connecting section, for inserting the sampler to take samples.

[0010] Furthermore, the sampling segment is set approximately horizontally.

[0011] Furthermore, a drain outlet is provided at the end of the sampling section near the sampling port, and the sampling section is inclined downward relative to the horizontal plane at an angle not exceeding 5°.

[0012] Furthermore, the length of the sampling segment is at least nine times the inner diameter of its pipe.

[0013] Furthermore, the annular pipe is equipped with a speed regulating valve and a pressure regulating valve to regulate the flow rate and volume of cooling water in the annular pipe.

[0014] Furthermore, the nozzle orifice diameter of the atomizing nozzle is 0.1mm to 0.5mm.

[0015] Furthermore, at least two atomizing nozzles are provided, and the nozzles of the two atomizing nozzles are arranged opposite each other.

[0016] Furthermore, the sampling port is located on the side of the sampling section, facing the sampling personnel.

[0017] Furthermore, the sampling port can be a square, rectangular, or circular port.

[0018] Furthermore, the sampler is provided with a filler on its exterior, which fills the contact gap between the sampler and the edge of the sampling port when the sampler is inserted into the sampling port.

[0019] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0020] This invention relates to a high-temperature flue gas detection device for industrial furnaces and kilns. Cooling water flows inside a ring-shaped pipe to cool the flue gas just entering the sampling section. The ring-shaped pipe is arranged around the outer or inner wall of the sampling section and extends axially along the sampling section, increasing the heat exchange area between the ring-shaped pipe and the sampling section. The ring-shaped pipe, in conjunction with an atomizing nozzle, further increases the heat exchange area, avoiding the thermal stress cracking of the pipe material caused by localized sudden cooling resulting from direct injection in traditional spray components. The sampling port is located a considerable distance from the connecting section, allowing sufficient time and travel for the flue gas to be cooled by the preceding ring-shaped pipe and atomizing nozzle, enabling the sampler to perform continuous sampling at a suitable temperature (below 180°C).

[0021] It is obvious that the elements or features described in the above individual embodiments can be used alone or in combination in other embodiments. Attached Figure Description

[0022] The dimensions and scales in the accompanying drawings do not represent the actual dimensions and scales of the product. The drawings are for illustrative purposes only, and some non-essential elements or features have been omitted for clarity.

[0023] Figure 1 This is a schematic diagram of the sampling pipe in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the sampling pipe in an embodiment of this utility model.

[0025] Explanation of reference numerals in the attached figures

[0026] 100. Sampling pipe; 110. Connecting section; 120. Sampling section; 121. Drain outlet; 130. Sampling port; 200. Circular pipe; 210. Atomizing nozzle. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely preferred embodiments of the present invention. Those skilled in the art can conceive of other ways to implement the present invention based on the preferred embodiments, and such other ways also fall within the scope of the present invention.

[0028] Reference Figures 1-2 This embodiment provides a high-temperature flue gas detection device for industrial furnaces and kilns, including a sampling pipe 100. The sampling pipe 100 includes a connecting section 110 and a sampling section 120 connected together. The connecting section 110 is used to connect to the flue gas pipe. The flue gas in the flue gas pipe enters the sampling section 120 through the connecting section 110, which facilitates subsequent sampling.

[0029] A ring-shaped pipe 200 is installed on the side of the sampling section 120 near the connecting section 110. The ring-shaped pipe 200 is connected to a water supply device, and cooling water flows inside the ring-shaped pipe 200 to cool the flue gas that has just entered the sampling section 120. The ring-shaped pipe 200 is arranged around the outer or inner wall of the sampling section 120 and extends along the axial direction of the sampling section 120, which can increase the heat exchange area between the ring-shaped pipe 200 and the sampling section 120. An atomizing nozzle 210 is connected to the ring-shaped pipe 200, and the nozzle of the atomizing nozzle 210 is located inside the sampling section 120. Under high pressure, the nozzle of the atomizing nozzle 210 breaks the cooling water into droplets, increasing the contact between the cooling water and the flue gas and improving the cooling efficiency. The ring-shaped pipe 200 and the atomizing nozzle 210 increase the heat exchange area and avoid the situation of local sudden cooling caused by direct injection of traditional injection components, which can lead to thermal stress cracking of the pipe material.

[0030] A sampling port 130 is provided on the side of the sampling section 120 away from the connecting section 110 for inserting the sampler for sampling. The sampling port 130 is far from the connecting section 110, which allows the flue gas sufficient time and travel through the preceding annular pipe 200 and atomizing nozzle 210 for cooling, enabling the sampler to perform continuous sampling at a suitable temperature (below 180°C).

[0031] It should be noted that the annular pipe 200 is either attached to the surface of the sampling section 120 or positioned at a certain distance from the surface of the sampling section 120. Preferably, the annular pipe 200 is attached to the surface of the sampling section 120, resulting in higher heat exchange efficiency.

[0032] To improve the representativeness of flue gas sampling, it is necessary to reduce interference from eddies or turbulence during flue gas flow. In some embodiments, the sampling section 120 is positioned approximately horizontally. Airflow within a horizontally positioned duct generally forms a stable and uniform velocity distribution more easily than within a vertically positioned duct. The length of the sampling section 120 is at least nine times its duct inner diameter, which can reduce eddy or turbulence interference and improve sampling representativeness. Specifically, the sampling section 120 is 9 m long and has an inner diameter of 0.3 m.

[0033] Understandably, the spray from the atomizing nozzle 210 cools the flue gas, and the cooling water generated by the spray deposition needs to be discharged promptly. In some embodiments, a drain outlet 121 is provided at the end of the sampling section 120 near the sampling port 130. The sampling section 120 is inclined downward relative to the horizontal plane, with an inclination angle not exceeding 5°. The inclination angle can be 1.5°, 2°, 2.5°, 3°, 3.75°, 4°, etc. By using a smaller downward inclination angle to make the sampling section 120 tilt downward, the position of the drain outlet 121 is lower, and the deposited cooling water can slide out from the drain outlet 121 under the action of gravity. The wastewater from cooling is discharged through the drain outlet 121 at the end of the pipe and connected to the sewage network for treatment at the sewage treatment plant.

[0034] Furthermore, to reduce the impact of thermal shock on the sampling pipe 100, in some embodiments, the annular pipe 200 is equipped with a speed regulating valve and a pressure regulating valve to adjust the flow rate and velocity of the cooling water in the annular pipe 200. By controlling the flow rate and velocity of the cooling water, gradient temperature control can be achieved, thereby gradually cooling the flue gas.

[0035] It should be noted that the atomizing nozzle 210 adopts a high-pressure orifice structure, and the nozzle orifice diameter of the atomizing nozzle 210 is 0.1mm to 0.5mm. Water is broken into droplets under high pressure through the extremely small orifice nozzle. There are no heat-sensitive elements inside the spray head, and the spray is continuous.

[0036] In some embodiments, such as Figure 2As shown, at least two atomizing nozzles 210 are provided, and the nozzles of the two atomizing nozzles 210 are arranged opposite each other. The oppositely arranged atomizing nozzles 210 cause the droplets to collide at high speed in the central area of ​​the pipe, further breaking them into finer particles, increasing the contact surface area with the flue gas, and accelerating the evaporation and heat absorption process. The opposing sprays from the two atomizing nozzles 210 create strong turbulence in the pipe, which promotes forced mixing of water mist and flue gas through velocity and pressure differences, avoiding uneven local temperature drop or wet bottom phenomenon.

[0037] To facilitate flue gas sampling, in some embodiments, the sampling port 130 is located on the side of the sampling section 120, facing the sampling personnel. This allows the sampling personnel to more easily calibrate the depth and angle at which the sampler extends into the sampling section 120. The sampling port 130 can be square, rectangular, or circular to accommodate samplers of different shapes, providing sufficient space to adjust the insertion angle. A filler is provided on the outside of the sampler, which fills the edge contact gap between the sampler and the sampling port 130 when the sampler is inserted into the sampling port 130. The filler increases the seal of the sampling port 130, reduces the entry of outside air into the sampling section 120, and improves sampling accuracy.

[0038] In the description of this utility model, it should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The scope of protection of this utility model is defined only by the claims. Thanks to the teachings of this utility model, those skilled in the art will readily recognize that alternative structures to the disclosed structure can be used as feasible alternative implementations, and that the disclosed implementations can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. A high-temperature flue gas detection device for industrial furnaces and kilns, comprising a sampling pipe (100), wherein the sampling pipe (100) includes a connecting section (110) and a sampling section (120) connected together, wherein the connecting section (110) is used to connect to a flue gas pipe; Its features are, A ring pipe (200) is provided on the side of the sampling section (120) near the connecting section (110). The ring pipe (200) is connected to a water supply device and cooling water flows inside it. The ring pipe (200) is arranged around the outer or inner wall of the sampling section (120) and extends along the axial direction of the sampling section (120). An atomizing nozzle (210) is connected to the ring pipe (200), and the nozzle of the atomizing nozzle (210) is located inside the sampling section (120). The sampling section (120) has a sampling port (130) on the side away from the connecting section (110) for inserting the sampler for sampling.

2. The high-temperature flue gas detection device for industrial furnaces and kilns according to claim 1, characterized in that, The sampling segment (120) is set roughly horizontally.

3. The high-temperature flue gas detection device for industrial furnaces and kilns according to claim 2, characterized in that, The sampling section (120) is provided with a drain outlet (121) at the end near the sampling port (130). The sampling section (120) is inclined downward relative to the horizontal plane, and the inclination angle does not exceed 5°.

4. The high-temperature flue gas detection device for industrial furnaces and kilns according to claim 2, characterized in that, The length of the sampling section (120) is at least 9 times the inner diameter of its pipe.

5. The high-temperature flue gas detection device for industrial furnaces and kilns according to claim 1, characterized in that, The annular pipe (200) is equipped with a speed regulating valve and a pressure regulating valve to regulate the flow rate and flow volume of cooling water in the annular pipe (200).

6. The high-temperature flue gas detection device for industrial furnaces and kilns according to claim 1, characterized in that, The nozzle orifice diameter of the atomizing nozzle (210) is 0.1mm to 0.5mm.

7. The high-temperature flue gas detection device for industrial furnaces and kilns according to claim 6, characterized in that, At least two atomizing nozzles (210) are provided, and the nozzles of the two atomizing nozzles (210) are arranged opposite to each other.

8. The high-temperature flue gas detection device for industrial furnaces and kilns according to claim 2, characterized in that, The sampling port (130) is located on the side of the sampling section (120) and faces the sampling personnel.

9. The high-temperature flue gas detection device for industrial furnaces and kilns according to claim 8, characterized in that, The sampling port (130) can be square, rectangular, or circular.

10. The high-temperature flue gas detection device for industrial furnaces and kilns according to claim 1, characterized in that, The sampler is provided with a filler on its exterior, which fills the edge contact gap between the sampler and the sampling port (130) when the sampler is inserted into the sampling port (130).

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