An online monitoring flue gas sampling dehumidification device

Abstract

The utility model discloses a kind of on-line monitoring flue gas sampling dehumidification device, including annular cover, dehumidification part, sampling shell;The annular cover is attached to the outer wall of flue pipe, and is communicated with the inside of flue pipe by several holes evenly opened;The dehumidification part is communicated with annular cover by first pipeline;The sampling shell for inserting sampling probe is communicated with the end of dehumidification part away from annular cover;The upper portion of the end of sampling shell away from dehumidification part is communicated with the flue pipe above annular cover by second pipeline.The utility model has the advantages that: by adopting the serpentine flue gas flow channel of multistage upper and lower staggered arrangement's flat plate cavity, the contact area and heat exchange time of cold wall and flue gas are greatly increased, can make water vapor in high-temperature flue gas fully, quickly condense and precipitate, and the dehumidification effect is superior to traditional single-stage or simple coil type dehumidifier, can provide continuous, stable dry sample gas for subsequent analytical instrument.

Description

Technical Field

[0001] This utility model relates to the field of flue gas sampling and dehumidification technology, and in particular to an online monitoring flue gas sampling and dehumidification device. Background Technology

[0002] Flue gas is a visible mixture of gases containing particulate matter, water vapor, and harmful substances produced during the combustion or pyrolysis of substances.

[0003] Online flue gas monitoring refers to an advanced technology that uses automated analytical instruments installed on flue gas ducts to continuously and in real time measure the concentration and emission parameters of pollutants (such as particulate matter, SO2, and NOx) in flue gas. When sampling flue gas for online monitoring, the presence of moisture can easily affect the monitoring results, leading to measurement biases and a lack of representativeness. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an online monitoring flue gas sampling and dehumidification device.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] An online monitoring flue gas sampling and dehumidification device includes an annular hood, a dehumidification section, and a sampling shell. The annular hood is fitted to the outer wall of a flue gas exhaust pipe and communicates with the inside of the exhaust pipe through a plurality of evenly spaced holes. The dehumidification section is connected to the annular hood through a first pipe. The end of the dehumidification section away from the annular hood is connected to a sampling shell for inserting a sampling probe. The upper part of the end of the sampling shell away from the dehumidification section is connected to the exhaust gas exhaust pipe above the annular hood through a second pipe.

[0007] Furthermore, the dehumidification section includes a dehumidification shell, a flat plate cavity, a connecting pipe, an inlet pipe, and an outlet pipe; several flat plate cavities are fixedly connected inside the dehumidification shell; adjacent flat plate cavities are arranged vertically at intervals, forming a serpentine flue gas flow channel inside the dehumidification shell; adjacent flat plate cavities are connected through corresponding connecting pipes; the inlet pipe passes through the dehumidification shell and connects to the flat plate cavity near the first pipe; the outlet pipe passes through the dehumidification shell and connects to the flat plate cavity near the sampling probe.

[0008] Furthermore, the lower end of the space separated by the flat plate cavity inside the dehumidification shell is connected to a corresponding number of drain pipes; the drain pipes are connected to the upper end of the liquid collection tank.

[0009] Furthermore, the flat plate cavity is provided with 13 chambers, with 6 chambers at the upper end and 7 chambers at the lower end of the dehumidification shell; the connecting pipe is provided with 12 pipes; and the drain pipe is provided with 8 pipes.

[0010] Furthermore, a valve is installed on the first pipeline.

[0011] Furthermore, the second pipeline is equipped with a fan.

[0012] The beneficial effects of this utility model are:

[0013] By employing a serpentine flue gas flow channel composed of multi-stage staggered flat plate cavities, the contact area and heat exchange time between the cold wall and the flue gas are greatly increased. This allows water vapor in the high-temperature flue gas to condense and precipitate fully and quickly, resulting in a dehumidification effect superior to traditional single-stage or simple coil dehumidifiers. This provides a continuous and stable dry sample gas for subsequent analytical instruments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 This is a partial structural schematic diagram of the present invention.

[0017] In the picture,

[0018] 1-Exhaust pipe, 2-Annular hood, 3-Dehumidification section, 4-Sampling shell, 5-First pipe, 6-Second pipe, 7-Sampling probe, 8-Liquid collection tank, 9-Drainage pipe;

[0019] 11-hole;

[0020] 31-Dehumidifier housing; 32-Flat plate cavity; 33-Connecting pipe; 34-Inlet pipe; 35-Outlet pipe;

[0021] 51-Valve;

[0022] 61-Wind fan. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Reference Figure 1-3As shown, an online monitoring flue gas sampling and dehumidification device includes an annular hood 2, a dehumidification section 3, and a sampling shell 4. The annular hood 2 is fitted to the outer wall of the exhaust pipe 1 and communicates with the interior of the exhaust pipe 1 through a plurality of evenly spaced holes 11. The dehumidification section 3 is connected to the annular hood 2 through a first pipe 5. The end of the dehumidification section 3 away from the annular hood 2 is connected to the sampling shell 4 for inserting a sampling probe 7. The upper part of the end of the sampling shell 4 away from the dehumidification section 3 is connected to the exhaust pipe 1 above the annular hood 2 through a second pipe 6. This device is used to fix on the outside of the exhaust pipe 1 to realize the process of multi-point circumferential introduction, graded dehumidification, isobaric flow stabilization, and clean sampling of the flue gas inside the pipe.

[0025] It should be noted that the annular cover 2 is detachably fixed to the outer wall of the exhaust pipe 1 by a flange or clamp, and its inner wall is tightly fitted to the outer wall of the exhaust pipe 1 to prevent air leakage. The first pipe 5 is preferably made of corrosion-resistant and high-temperature-resistant materials, such as PTFE (polytetrafluoroethylene) or stainless steel 316L. A valve 51 is provided on the first pipe 5. The valve 51 can be a manual ball valve or an electric regulating valve, used to control the on / off state and flow rate of the sampling airflow. Preferably, the valve 51 can be an SS-41GS4 type ball valve or an equivalent substitute. The dehumidification section 3 is the main space for flue gas dehumidification. The sampling shell 4 facilitates the insertion of the sampling probe 7. The dehumidified dry flue gas finally flows into the sampling shell 4, is extracted by the sampling probe 7 and sent to the downstream analyzer (such as a flue gas analyzer, model ULTRAMAT 23 or equivalent).

[0026] Specifically, the dehumidification unit 3 includes a dehumidification shell 31, a flat cavity 32, a connecting pipe 33, an inlet pipe 34, and an outlet pipe 35. The dehumidification shell 31 is a sealed container made of corrosion-resistant material (such as PP, PVDF, or stainless steel). Several flat cavities 32 are fixedly connected inside the dehumidification shell 31. The flat cavity 32 is preferably a hollow, flat rectangular cavity made of a material with high thermal conductivity (such as anodized aluminum or stainless steel), and a cooling medium (such as cooling water) can flow inside. Adjacent flat cavities 32 are arranged vertically at intervals, so that a serpentine flue gas flow channel 36 is formed inside the dehumidification shell 31. Adjacent flat cavities 32 are connected through corresponding connecting pipes 33. The inlet pipe 34 passes through the dehumidification shell 31 and connects to the flat cavity 32 near the first pipe 5. The outlet pipe 35 passes through the dehumidification shell 31 and connects to the flat cavity 32 near the sampling probe 7. The adjacent flat cavities 32 are arranged vertically at intervals and connected in series through the connecting pipe 33, thereby forming a tortuous serpentine flue gas flow channel 36 inside the dehumidification shell 31, which greatly increases the contact area and time between the flue gas and the cold wall.

[0027] Specifically, the lower end of the space separated by the flat plate cavity 32 inside the dehumidifier housing 31 is connected to a corresponding number of drain pipes 9; the drain pipes 9 are connected to the upper end of the liquid collection tank 8. The drain pipes 9 are preferably flexible, corrosion-resistant hoses (such as silicone or PTFE tubing), and their lower ends are all connected to a liquid collection tank 8. The liquid collection tank 8 can be made of transparent material for easy observation of the liquid level and is equipped with a liquid level alarm and a drain valve (not shown in the figure) to achieve automatic drainage. Preferably, there are 8 drain pipes 9, corresponding to the main condensate collection areas inside the dehumidifier housing.

[0028] In a preferred embodiment, there are 13 flat plate cavities 32, and 6 are arranged at the upper end and 7 at the lower end of the dehumidification shell 31 in an alternating pattern; there are 12 connecting pipes 33, which connect the 13 flat plate cavities 32 in series.

[0029] Specifically, the drain pipes 9 are preferably flexible, corrosion-resistant hoses (such as silicone or PTFE tubing), with their lower ends connected to a collection tank 8. The collection tank 8 can be made of transparent material for easy observation of the liquid level and is equipped with a liquid level alarm and a drain valve (not shown in the figure) to achieve automatic drainage. Preferably, there are eight drain pipes 9, corresponding to the main condensate collection areas inside the dehumidifier housing.

[0030] Specifically, the second pipe 6 is equipped with a fan 61. The fan 61 is preferably a miniature corrosion-resistant vacuum pump or an induced draft fan, used to generate negative pressure and return the sampled dried flue gas to the exhaust pipe 1. This has multiple benefits: first, it maintains flow within the sampling pipeline, preventing dead zones; second, returning the dehumidified sample gas does not affect the total flow rate of the exhaust pipe, ensuring the representativeness of the sampling; and third, the return gas is used to gently purge the sampling shell 4, preventing residual condensation. The fan 61 can be a KNF Neuberger NMP 830 series miniature diaphragm pump or an equivalent product.

[0031] The working principle of this utility model:

[0032] As the flue gas flows within the exhaust pipe 1, some of it enters the inner cavity of the annular shroud 2 through the holes 11 on the annular shroud 2. With the valve 51 on the first pipe 5 open and the fan 61 operating, the flue gas is drawn into the first pipe 5 and enters the serpentine flue gas flow channel 36 of the dehumidification section 3. While flowing through multiple low-temperature flat chambers 32, the flue gas is thoroughly cooled, and moisture condenses. The condensate is collected in the condensate tank 8 through the drain pipe 9. The dehydrated, dry flue gas continues to flow, entering the sampling shell 4 through the outlet pipe 35, and is finally extracted by the sampling probe 7 and sent to the analyzer for analysis. After sampling, most of the dry flue gas is drawn back to the upstream of the exhaust pipe 1 through the second pipe 6 by the fan 61, completing one cycle.

[0033] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. An on-line monitoring flue gas sampling dehumidification device, characterized by: It includes an annular cover (2), a dehumidifying part (3), and a sampling shell (4); the annular cover (2) is attached to the outer wall of the exhaust pipe (1) and is connected to the inside of the exhaust pipe (1) through a number of evenly opened holes (11); the dehumidifying part (3) is connected to the annular cover (2) through a first pipe (5); the end of the dehumidifying part (3) away from the annular cover (2) is connected to the sampling shell (4) for inserting a sampling probe (7); the upper part of the end of the sampling shell (4) away from the dehumidifying part (3) is connected to the exhaust pipe (1) above the annular cover (2) through a second pipe (6).

2. The online monitoring flue gas sampling and dehumidification device according to claim 1, characterized in that: The dehumidification unit (3) includes a dehumidification shell (31), a flat plate cavity (32), a connecting pipe (33), an inlet pipe (34), and an outlet pipe (35); several flat plate cavities (32) are fixedly connected inside the dehumidification shell (31); adjacent flat plate cavities (32) are arranged vertically at intervals, so that a serpentine flue gas flow channel (36) is formed inside the dehumidification shell (31); the adjacent flat plate cavities (32) are connected through corresponding connecting pipes (33); the inlet pipe (34) passes through the dehumidification shell (31) and connects to the flat plate cavity (32) on the side near the first pipe (5); the outlet pipe (35) passes through the dehumidification shell (31) and connects to the flat plate cavity (32) on the side near the sampling probe (7).

3. The online monitoring flue gas sampling and dehumidification device according to claim 2, characterized in that: The lower end of the space separated by the flat plate cavity (32) inside the dehumidification shell (31) is connected to a corresponding number of drain pipes (9); the drain pipes (9) are connected to the upper end of the liquid collection tank (8).

4. The online monitoring flue gas sampling and dehumidification device according to claim 3, characterized in that: The flat plate cavity (32) is provided with 13, and the dehumidification shell (31) is provided with 6 at the upper end and 7 at the lower end; the connecting pipe (33) is provided with 12; the drain pipe (9) is provided with 8.

5. The online monitoring flue gas sampling and dehumidification device according to any one of claims 1 to 4, characterized in that: A valve (51) is installed on the first pipe (5).

6. The online monitoring flue gas sampling and dehumidification device according to any one of claims 1 to 4, characterized in that: The second pipe (6) is equipped with a fan (61).

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