Flue gas detection equipment

Abstract

The utility model belongs to the technical field of test equipment, and particularly relates to flue gas detection equipment which comprises a flange plate connected with a flue gas pipeline, a probe fixing column is arranged at one end of the flange plate, and a first flow field compensation pressure measuring probe, a second flow field compensation pressure measuring probe and a flue gas sampling probe are arranged on the probe fixing column. The end, extending into the flue gas pipeline, of the first flow field compensation pressure tapping probe and the end, extending into the flue gas pipeline, of the second flow field compensation pressure tapping probe are each provided with a static pressure tapping opening perpendicular to the flue gas flow direction. The distance between the first flow field compensation pressure tapping probe and the second flow field compensation pressure tapping probe is smaller than the diameter of the probe fixing column, and the distance between the second flow field compensation pressure tapping probe and the flue gas sampling probe is smaller than the diameter of the probe fixing column. The device can solve the problems that sampling and working condition parameters are different in source and the pressure parameter acquisition stability is poor, and the accuracy of flue gas component concentration detection is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of test equipment, specifically relates to a flue gas detection equipment. BACKGROUND

[0002] In the field of industrial production waste gas emission monitoring, the composition concentration of flue gas characteristic pollutants is the core monitoring parameter and is also the key link of industrial fixed source waste gas online monitoring. At present, the mainstream industrial flue gas composition detection equipment usually sets up independent flue gas sampling units and working condition parameter collection units respectively, completes the standard dry state conversion of the detection result by collecting flue gas pressure, temperature and other parameters, and finally obtains accurate flue gas composition concentration data. However, there are still several outstanding problems in the actual application of the existing equipment: first, the flue gas sampling unit and the pressure and temperature collection unit adopt a split type independent installation structure, and during on-site installation, positioning deviation or inconsistent measuring points may easily lead to the fact that the composition sampling point and the working condition parameter collection point are not in the same measuring area, thereby causing the sampling data and the conversion parameters to be of different sources and affecting the accuracy of the flue gas composition standard dry concentration conversion; second, the split type design needs to open multiple installation holes in the flue duct wall, which not only makes the installation and wiring process complicated and the on-site construction difficult, but also exposes multiple groups of detection components to the high-temperature, high-dust and strong-corrosion flue gas environment independently, so that the protection capability is insufficient and problems such as wear, corrosion and blockage are likely to occur, which seriously affects the continuity of flue gas composition sampling and the stability of long-term operation of the equipment, and further shortens the service life of the equipment and increases the on-site operation and maintenance cost.

[0003] Chinese patent CN112557124A discloses a novel constant-speed sampling flue gas probe, which comprises a flange, a flue gas sampling mechanism, a flue gas pressure and flow rate measuring mechanism and a temperature detection mechanism arranged in cooperation with the flue gas sampling mechanism are installed on the flange, the flue gas sampling mechanism comprises a T-shaped nut, a T-shaped heat insulation sleeve, a stainless steel sampling pipe, a first annular connecting seat, a second annular connecting seat, a first annular mounting seat, a second annular mounting seat and a spiral electric heating wire. The patent has the advantages of simple structure, convenient maintenance, heating function, effective prevention of flue gas condensation blockage, guarantee of the continuity of flue gas sampling, detection of flue gas temperature, pressure and other working condition parameters, auxiliary realization of constant-speed sampling, applicability to multiple scenes such as flue gas collection, dust collection and ammonia measurement, and wide applicability. However, the patent uses a single pressure-taking pipe to realize flue gas pressure measurement, has no multidirectional pressure-taking or flow field compensation design, and the pressure-taking pipe is installed on the side of the sampling pipe through an external connecting plate, so that the measuring point flow field is easily affected by the disturbance of the sampling pipe, the disturbance such as bias flow and vortex in the flue duct cannot be offset, the collected pressure parameters have large fluctuation and poor stability, and thus the accuracy of the flue gas composition concentration conversion is affected, and the detection result cannot truly reflect the actual emission situation of the flue gas. SUMMARY

[0004] The purpose of this invention is to provide a flue gas detection device that can solve the problems of different sampling and operating parameters and poor stability of pressure parameter acquisition, thereby improving the accuracy of flue gas component concentration detection.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A flue gas detection device includes a flange connected to a flue gas duct. A probe fixing post is fixedly installed at one end of the flange. A first flow field compensation pressure tapping probe, a second flow field compensation pressure tapping probe, and a flue gas sampling probe are axially inserted through the probe fixing post. The end of the flue gas sampling probe that extends into the flue gas duct has a flue gas sampling port facing the flue gas flow direction. The ends of the first and second flow field compensation pressure tapping probes that extend into the flue gas ducts both have static pressure tapping ports perpendicular to the flue gas flow direction. The probe fixing post is cylindrical in shape. The distance between the first and second flow field compensation pressure tapping probes is less than the diameter of the probe fixing post, and the distance between the second flow field compensation pressure tapping probe and the flue gas sampling probe is less than the diameter of the probe fixing post.

[0007] Furthermore, the opening direction of the first flow field compensation pressure tapping probe is opposite to that of the second flow field compensation pressure tapping probe.

[0008] Furthermore, the probe mounting post is welded and fixedly connected to the flange.

[0009] Furthermore, the ends of the first flow field compensation pressure tapping probe, the second flow field compensation pressure tapping probe, and the flue gas sampling probe that are away from the flue gas duct are all installed through the flange.

[0010] Furthermore, both the end of the first flow field compensation pressure tapping probe away from the flue gas duct and the end of the second flow field compensation pressure tapping probe away from the flue gas duct are connected to a static pressure tapping pipe joint.

[0011] Furthermore, the end of the flue gas sampling probe furthest from the flue gas duct is connected to a flue gas sampling tube connector.

[0012] Furthermore, a temperature sensor mounting hole is provided through the flange.

[0013] Furthermore, the materials of the probe fixing column, the first flow field compensation pressure tapping probe, the second flow field compensation pressure tapping probe, and the flue gas sampling probe are all stainless steel.

[0014] Furthermore, the probe fixing column, the first flow field compensation pressure tapping probe, the second flow field compensation pressure tapping probe, and the flue gas sampling probe are integrally molded and set up.

[0015] Furthermore, the diameter of the probe fixing post is 10-20cm.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention integrates a flue gas sampling probe, a first flow field compensation pressure tapping probe, and a second flow field compensation pressure tapping probe, all axially connected within the same probe mounting column. This places the three probes within a compact, unified measurement area, resolving the data source discrepancies caused by positioning deviations and measurement point separations between sampling and pressure acquisition units in traditional split-type equipment. It ensures that flue gas samples and pressure parameters are collected from the same location within the flue, providing a common source of fundamental data for the standard-state conversion of flue gas component concentration. The coordinated placement of the first and second flow field compensation pressure tapping probes effectively counteracts uneven flow field disturbances such as flow deviations and eddies within industrial flues. This solves the problem of large fluctuations and poor stability in pressure parameters collected by a single pressure tapping tube in existing technologies, resulting in more stable and accurate static pressure parameters and further ensuring the reliability of flue gas component concentration detection results. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0019] Figure 2 This is a partial structural cross-sectional view of the present invention installed on a flue gas duct;

[0020] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0021] Figure 4 This is a schematic diagram of the structure of the present invention. Figure 3 ;

[0022] In the picture:

[0023] 1. Flue gas duct; 2. Flange; 3. Probe mounting post; 4. First flow field compensation pressure tapping probe; 5. Second flow field compensation pressure tapping probe; 6. Flue gas sampling probe; 7. Temperature sensor mounting hole. Detailed Implementation

[0024] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0025] Example 1

[0026] like Figures 1-4As shown, the flue gas detection equipment includes a flange 2 connected to a flue gas duct 1. A probe fixing post 3 is fixedly installed at one end of the flange 2. A first flow field compensation pressure tapping probe 4, a second flow field compensation pressure tapping probe 5, and a flue gas sampling probe 6 are axially inserted through the probe fixing post 3. The end of the flue gas sampling probe 6 that extends into the flue gas duct 1 is provided with a flue gas sampling port facing the flue gas flow direction. The ends of the first flow field compensation pressure tapping probe 4 and the second flow field compensation pressure tapping probe 5 that extend into the flue gas duct 1 are both provided with static pressure tapping ports perpendicular to the flue gas flow direction. The probe fixing post 3 is cylindrical in shape. The distance between the first flow field compensation pressure tapping probe 4 and the second flow field compensation pressure tapping probe 5 is less than the diameter of the probe fixing post 3. The distance between the second flow field compensation pressure tapping probe 5 and the flue gas sampling probe 6 is less than the diameter of the probe fixing post 3.

[0027] The opening direction of the first flow field compensation pressure tapping probe 4 is opposite to the opening direction of the second flow field compensation pressure tapping probe 5.

[0028] The probe fixing post 3 is welded and fixed to the flange 2.

[0029] The first flow field compensation pressure tapping probe 4, the second flow field compensation pressure tapping probe 5, and the flue gas sampling probe 6, all located at the end furthest from the flue gas duct 1, are all installed through the flange 2.

[0030] The end of the first flow field compensation pressure tapping probe 4 away from the flue gas duct 1 and the end of the second flow field compensation pressure tapping probe 5 away from the flue gas duct 1 are both connected to a static pressure tapping pipe joint.

[0031] The end of the flue gas sampling probe 6 furthest from the flue gas duct 1 is connected to a flue gas sampling tube connector.

[0032] A temperature sensor mounting hole 7 is provided through flange 2.

[0033] The materials of the probe fixing column 3, the first flow field compensation pressure tapping probe 4, the second flow field compensation pressure tapping probe 5, and the flue gas sampling probe 6 are all stainless steel.

[0034] The probe fixing post 3, the first flow field compensation pressure tapping probe 4, the second flow field compensation pressure tapping probe 5, and the flue gas sampling probe 6 are integrally formed.

[0035] The diameter of probe fixing post 3 is 10-20cm.

[0036] Working process and principle:

[0037] I. Equipment Installation

[0038] The device is sealed and fixedly connected to the flue gas duct 1 to be tested via flange 2, with the probe fixing post 3 extending vertically into the flue gas duct 1. This ensures that the flue gas sampling port of the flue gas sampling probe 6 is directly facing the airflow direction within the flue gas duct 1. The static pressure taps of the first flow field compensation pressure tap probe 4 and the second flow field compensation pressure tap probe 5 are perpendicular to the airflow direction. Simultaneously, the temperature sensor is inserted into the temperature sensor mounting hole 7 on flange 2, ensuring that the temperature sensor's sensing end is within the same measurement area as each probe within the flue gas duct 1. The static pressure taps at the ends of the first flow field compensation pressure tap probe 4 and the second flow field compensation pressure tap probe 5 are connected to the backend data acquisition system via piping. The flue gas sampling port at the end of the flue gas sampling probe 6 is connected to the backend flue gas composition analysis system via piping. The signal line of the temperature sensor is also connected to the backend data acquisition system.

[0039] II. Smoke Gas Sample Collection

[0040] When the flue gas flows normally in the flue gas duct 1, the flue gas flow is directly facing the flue gas sampling port at one end of the flue gas sampling probe 6 that extends into the duct. The flue gas directly enters the flue gas sampling probe 6 and is transmitted to the downstream flue gas component analysis system to provide a flue gas sample for flue gas component concentration detection.

[0041] III. Flue Gas Static Pressure Parameter Acquisition

[0042] When the flue gas flows through the static pressure taps of the first flow field compensation pressure tap 4 and the second flow field compensation pressure tap 5, the pressure taps are perpendicular to the flue gas flow direction, effectively avoiding interference from the flue gas dynamic pressure on the static pressure acquisition, thus achieving accurate acquisition of the flue gas static pressure. At the same time, the first flow field compensation pressure tap 4 and the second flow field compensation pressure tap 5 are arranged in a coordinated manner with opposite opening directions, which can effectively counteract the non-uniform flow field disturbances such as flow deviation and eddies in the flue gas duct 1, making the acquired static pressure parameters more stable and accurate. The acquired static pressure signals are synchronously transmitted to the back-end data acquisition system.

[0043] IV. Flue Gas Temperature Parameter Acquisition

[0044] The temperature sensor, inserted into the temperature sensor mounting hole 7, has its sensing end directly exposed to the flue gas in the flue gas duct 1. It collects flue gas temperature parameters in real time, and the temperature signal is transmitted to the back-end data acquisition system through the signal line, providing accurate temperature basis data for the standard state conversion of flue gas component concentration.

[0045] V. Data Processing and Concentration Conversion

[0046] The backend data acquisition system and the flue gas composition analysis system synchronously receive flue gas samples transmitted by flue gas sampling probe 6, static pressure parameters transmitted by the first flow field compensation pressure tapping probe 4 and the second flow field compensation pressure tapping probe 5, and temperature parameters transmitted by the temperature sensor. Using the same pressure and temperature operating parameters, the system performs standard state conversion of the component concentration of the flue gas sample, and finally obtains accurate detection results of the characteristic pollutant component concentration of the flue gas, thus completing the entire flue gas detection process.

Claims

1. A flue gas detection device, comprising a flange (2) connected to a flue gas duct (1), characterized in that, A probe fixing post (3) is fixedly installed at one end of the flange (2). A first flow field compensation pressure tapping probe (4), a second flow field compensation pressure tapping probe (5) and a flue gas sampling probe (6) are installed through the probe fixing post (3) along the axial direction. The end of the flue gas sampling probe (6) that extends into the flue gas pipe (1) is provided with a flue gas sampling port facing the flue gas flow direction. The end of the first flow field compensation pressure tapping probe (4) that extends into the flue gas pipe (1) and the end of the second flow field compensation pressure tapping probe (5) that extends into the flue gas pipe (1) are both provided with static pressure tapping ports perpendicular to the flue gas flow direction. The probe fixing post (3) is cylindrical in shape. The distance between the first flow field compensation pressure tapping probe (4) and the second flow field compensation pressure tapping probe (5) is less than the diameter of the probe fixing post (3). The distance between the second flow field compensation pressure tapping probe (5) and the flue gas sampling probe (6) is less than the diameter of the probe fixing post (3).

2. The flue gas detection device according to claim 1, characterized in that, The opening direction of the first flow field compensation pressure tapping probe (4) is opposite to the opening direction of the second flow field compensation pressure tapping probe (5).

3. The flue gas detection device according to claim 1, characterized in that, The probe fixing column (3) is welded and fixed to the flange (2).

4. The flue gas detection device according to claim 1, characterized in that, The first flow field compensation pressure tapping probe (4) is located at one end away from the flue gas duct (1), the second flow field compensation pressure tapping probe (5) is located at one end away from the flue gas duct (1), and the flue gas sampling probe (6) is located at one end away from the flue gas duct (1). All of these are installed through the flange (2).

5. The flue gas detection device according to claim 4, characterized in that, The end of the first flow field compensation pressure tapping probe (4) away from the flue gas duct (1) and the end of the second flow field compensation pressure tapping probe (5) away from the flue gas duct (1) are both connected to static pressure tapping pipe joints.

6. The flue gas detection device according to claim 4, characterized in that, The end of the flue gas sampling probe (6) away from the flue gas duct (1) is connected to a flue gas sampling pipe connector.

7. The flue gas detection device according to claim 1, characterized in that, A temperature sensor mounting hole (7) is provided through the flange (2).

8. The flue gas detection device according to claim 1, characterized in that, The materials of the probe fixing column (3), the first flow field compensation pressure tapping probe (4), the second flow field compensation pressure tapping probe (5), and the flue gas sampling probe (6) are all stainless steel.

9. The flue gas detection device according to claim 1, characterized in that, The probe fixing column (3), the first flow field compensation pressure tapping probe (4), the second flow field compensation pressure tapping probe (5) and the flue gas sampling probe (6) are integrally formed.

10. The flue gas detection device according to claim 1, characterized in that, The diameter of the probe fixing post (3) is 10-20cm.

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