A continuous monitoring device and method for flue gas emissions

Abstract

The invention discloses a continuous monitoring device and a monitoring method for flue gas emissions, and relates to the technical field of flue gas emissions. The device realizes intake detection, cleaning of pipelines and multi-directional intake and exhaust of components through a U-shaped intake pipe, a preheating pipe, a first return air pipe, a first intake pipe, an air collecting chamber, a condensing pipe, a liquid collecting chamber and a second return air pipe, and utilizes intake and exhaust preheating and insulation to achieve insulation measurement inside an insulation shell, pipelines and components, effectively reducing interference from temperature, oil and particulate matter, and improving monitoring accuracy; a laser scattering sensor is used to measure the concentration and particle size of particulate matter, and an optical fiber measurement unit is used to monitor other components in the flue gas, and real-time monitoring of the flue gas and analysis of emission components are achieved by collecting released liquid and measuring substances dissolved in the liquid; the problem of low flue gas monitoring accuracy caused by easy interference with flue gas monitoring, easy fluctuation of detection data and lack of multi-operation mode switching technology of the detection device is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas emission, and in particular to a flue gas emission continuous monitoring device and a monitoring method. Background Art

[0002] The management of pollution sources such as industrial waste gas and traffic emissions has become a focus of attention in production activities. In order to effectively monitor and control pollutant emissions and ensure the quality of the atmospheric environment, continuous emission monitoring technology (CEMS) is widely used in industrial production and environmental protection. The application of this technology can not only monitor emission concentrations in real time to ensure that pollutant emissions meet relevant standards, but also provide timely and accurate emission data for environmental protection departments, so as to formulate effective control measures.

[0003] Although the continuous monitoring technology of flue gas emissions has made great progress and iterations, it still faces some technical and application challenges, which are specifically reflected in the following aspects:

[0004] Environmental interference: Other components in the flue gas (such as water vapor, dust, sulfide, etc.) may interfere with the monitoring results, resulting in data errors. In addition, the concentration fluctuation of gas components also makes it difficult to improve the monitoring accuracy.

[0005] When multiple detection devices are connected to the monitoring system and run in parallel or alternately, the existing monitoring system lacks the ability to monitor the flue gas in multiple modes in stages.

[0006] Moreover, the flue gas power of most existing monitoring systems is provided by flue gas sampling devices, air pumps, etc., which require additional electrical energy. When the flue gas emission continuous monitoring system is running for a long time, the flue gas power devices such as flue gas sampling devices and air pumps not only waste energy, but also in high temperature and corrosive environments, the reliability of their moving parts will decrease with the system installation and operation time, resulting in an increase in the number of maintenance times in the later stage of system operation and a decrease in system reliability.

[0007] In summary, it is found that the prior art has at least the following technical problems:

[0008] The existing flue gas emission detection system has the problems of low flue gas monitoring accuracy, such as the flue gas monitoring is easily disturbed, the detection data is prone to fluctuation, and the detection device lacks multi-operation mode switching technology. Summary of the invention

[0009] The purpose of the present invention is to provide a continuous monitoring device and method for flue gas emissions to solve the problems of low flue gas monitoring accuracy caused by the existing flue gas emission detection system, such as the flue gas monitoring is easily disturbed, the detection data is prone to fluctuations, and there is a lack of multi-operating mode switching of the detection device.

[0010] The various technical effects that can be produced by the preferred technical solutions among the various technical solutions provided by the present invention are described in detail below.

[0011] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0012] The present invention provides a device for continuously monitoring flue gas emissions, comprising an air intake fan without active power, a U-shaped air intake pipe, a filter, an air collecting chamber, an optical fiber measuring unit, an air source unit, a heat exchange radiator, a condenser, a liquid collecting chamber, a liquid sensing unit and a heat preservation shell; the U-shaped air intake pipe is installed on the outer wall of the exhaust pipe to be detected by a pull code, the air intake end of the U-shaped air intake pipe extends into the exhaust pipe, and the exhaust end of the U-shaped air intake pipe is connected to the exhaust pipe at the outer wall of the exhaust pipe; a telescopic pipe and a connecting seat are provided on the air intake end of the U-shaped air intake pipe; the rotating end of the air intake fan is rotatably connected to the connecting seat, and a torsion spring is installed on the rotating end. When the rising power of the smoke in the exhaust pipe is greater than the maximum required air intake amount of the air intake fan, the air intake fan rotates The rotating end flips upward, and the flipping angle of the intake fan is positively correlated with the rising power of the smoke in the smoke exhaust pipe, which is used to maintain the stable air intake amount at the intake end of the U-shaped intake pipe; the outlet end of the intake fan is connected to the telescopic tube, which is used to supply smoke into the U-shaped intake pipe; the U-shaped intake pipe is provided with an intake section, a middle section for collecting air and an exhaust section; a laser scattering sensor is provided on the intake section to measure the size data and concentration value of particles entering the smoke; the middle section for collecting air is connected to a preheating pipe at a bend near the intake section, and the preheating pipe is connected to the first air inlet of the air collecting chamber in a controllable opening and closing manner; the two sides of the filter are respectively connected to the first intake pipe and the second intake pipe in a controllable opening and closing manner, and the first intake pipe is connected to The air inlet side of the preheating tube is connected in parallel, and the second air inlet pipe is connected in parallel with the exhaust side of the preheating tube to communicate with the first air inlet; the measuring port of the air collecting chamber is connected to the optical fiber measuring unit; the first exhaust port of the air collecting chamber is connected to a first return air pipe that can be controlled to open and close, and the first return air pipe is connected to the middle section of the air collecting chamber, and the first return air pipe is arranged above the preheating tube; the second air inlet of the air collecting chamber is connected to the air source unit, which is used to fill the air collecting chamber with inert clean gas, exhaust the flue gas accumulated in the air collecting chamber, and perform gas flushing on the pipe of the U-shaped air inlet pipe and the blades of the air intake fan; the second exhaust port of the air collecting chamber is connected to a condenser that can be controlled to open and close, and the condenser is connected to the liquid collecting chamber for cooling the flue gas. The gas collects the released liquid into the liquid collecting chamber; a heat exchange radiator is installed outside the condenser tube to assist in cooling the passing flue gas; the top of the liquid collecting chamber is connected to a second air return pipe, and the second air return pipe is connected to the smoke exhaust pipe; the measuring end of the liquid sensor unit extends into the liquid collecting chamber to measure the type and content of the substance dissolved in the liquid; a drain valve is installed at the bottom of the liquid collecting chamber; the insulation shell wraps the U-shaped air inlet pipe, the filter, the air collecting chamber, the preheating pipe, the first air inlet pipe, the second air inlet pipe and the first air return pipe, and is used for insulation to keep the incoming flue gas at a high temperature, prevent the water in the flue gas from being released, and make the water-soluble acidic gas in the flue gas dissolve in the released water to avoid the formation of acidic liquid;Under the control of the opening and closing of the preheating pipe, the first air intake pipe, the second air intake pipe, the first air return pipe, the condensing pipe and the air source unit, the filter, the air collection chamber and the heat preservation shell are preheated, and the laser scattering sensor and the optical fiber measurement unit continuously measure the flue gas, and the liquid in the liquid collection chamber is periodically collected and measured by the liquid sensing unit, thereby realizing multi-mode graded measurement. ;

[0013] In one of the embodiments, along the vertical direction of the smoke exhaust pipe, the exhaust end of the U-shaped air intake pipe is always located above the air intake end of the U-shaped air intake pipe.

[0014] In one embodiment, the liquid sensing unit includes a pH sensor and an oxidation-reduction potential sensor, which are used to determine and measure the type and content of the acidic substance contained in the liquid collected in the liquid collecting chamber.

[0015] In one of the embodiments, the optical fiber measurement unit is used to measure the concentrations of sulfur dioxide, hydrogen sulfide, nitrogen oxides, carbon dioxide, and carbon monoxide contained in the flue gas collected in the gas collection chamber.

[0016] In one embodiment, the fiber optic measurement unit includes a plurality of fiber optic chemical sensors.

[0017] In one embodiment, the air source unit includes an air supply pipe, an air supply valve and an air tank; the two ends of the air supply pipe are respectively connected to the second air inlet of the air collecting chamber and the air tank; the air supply valve is installed on the air supply pipe to control the opening and closing of the air supply pipe.

[0018] In one of the embodiments, the condenser is connected to the lower part of the liquid collecting chamber; a liquid level sensor is installed in the liquid collecting chamber to monitor the liquid level in the liquid collecting chamber; when the liquid level in the liquid collecting chamber reaches the measurement level, the liquid sensing unit is started to measure; when the liquid level in the liquid collecting chamber reaches the drainage level and the measurement of the liquid sensing unit is stopped, the drain valve is controlled to open for drainage, and after the liquid level sensor sends back the lowest liquid level information, the drain valve is closed.

[0019] In one embodiment, a preheating air intake valve is installed on the preheating pipe; a first air intake valve is installed on the first air intake pipe, and a second air intake valve is installed on the second air intake pipe; a first exhaust valve is installed on the first return air pipe; a second exhaust valve is installed on the condenser pipe, and the second exhaust valve is arranged on the condenser pipe between the second exhaust port of the air collecting chamber and the heat exchange radiator.

[0020] In one embodiment, the filter includes a filter chamber and a collection tank, the air intake and exhaust sides of the upper portion of the filter chamber are respectively connected to the first air intake pipe and the second air intake pipe, and the lower portion of the filter chamber is detachably connected to the collection tank, and the collection tank is used to collect filtered oil and particulate matter.

[0021] A monitoring method is also provided, comprising the following steps: S1: in a first preheating mode, closing the first air inlet pipe, the second air inlet pipe, the condenser pipe and the air source unit, opening the preheating pipe and the first air return pipe, and dynamically passing flue gas to heat the preheating pipe, the first air return pipe and the air collecting chamber;

[0022] S2: In the second preheating mode, the preheating pipe, the condensing pipe and the gas source unit are closed, the first return air pipe, the first air inlet pipe and the second air inlet pipe are opened, and flue gas is dynamically introduced to heat the first air inlet pipe, the second air inlet pipe and the filter;

[0023] S3: The heat preservation shell absorbs the heat when the first preheating mode and the second preheating mode are running, and the temperature inside the heat preservation shell is increased, so that the heat preservation shell, the preheating pipe, the first return air pipe, the first air intake pipe, the second air intake pipe, the filter and the air collecting chamber inside the heat preservation shell reach the measurement temperature;

[0024] S4: In the first measurement mode: first, close the first air return pipe, the first air inlet pipe, the second air inlet pipe, the condenser pipe and the air source unit, and open the preheating pipe for at least 5 minutes; then open the first air return pipe, start the laser scattering sensor and the optical fiber measurement unit to perform preliminary continuous measurement of the flue gas;

[0025] S5: In the second measurement mode: first close the preheating tube, the first air inlet tube, the second air inlet tube and the condenser tube; open the first air return tube and the air source unit, and blow air into the air collecting chamber through the air source unit at least twice, each time for at least 3 seconds;

[0026] Then close the first air return pipe and the air source unit, open the first air inlet pipe and the second air inlet pipe for at least 10 minutes; then open the first air return pipe for at least 5 minutes, start the laser scattering sensor and the optical fiber measurement unit to perform secondary correction measurement on the flue gas, measure the data of the gas without oil, particulate matter and other impurities in the smoke, and reduce the influence of oil, particulate matter and other impurities mixed in the smoke directly measured in step S4;

[0027] S6: In the third measurement mode: first, close the preheating tube, the first air inlet tube, the second air inlet tube and the condenser tube; open the first air return tube and the air source unit, and blow air into the air collecting chamber through the air source unit at least twice, each time for at least 3 seconds;

[0028] Then close the preheating pipe, the first air return pipe, the air source unit and the condenser pipe, and open the first air inlet pipe and the second air inlet pipe for at least 10 minutes; then open the condenser pipe, the liquid collecting chamber starts to collect liquid, and the laser scattering sensor and the optical fiber measurement unit are started to continuously measure the flue gas; when the liquid level in the liquid collecting chamber reaches the measurement level, the liquid sensing unit is started to measure;

[0029] The laser scattering sensor and the optical fiber measurement unit are used to measure the periodic data of the flue gas under the negative pressure state of the liquid collection, and the type and content data of the water-soluble substances are obtained through the liquid sensing unit;

[0030] S7: The first measurement mode of step S4 is a preliminary continuous measurement to obtain continuous monitoring data; the second measurement mode of step S5 is a secondary correction measurement to measure the correction data without the influence of debris such as oil and particles;

[0031] When the continuous monitoring data acquired for more than 10 minutes in the measurement mode of step S4 shows an over-standard warning, the measurement mode of step S5 is started to acquire the corrected data. When the acquired corrected data does not show an over-standard warning for at least 5 minutes, the measurement mode is switched to the measurement mode of step S4;

[0032] The measurement mode of step S6 is performed at least three times from the start of the smoke exhaust pipe to the stop of the smoke exhaust pipe during the day to accurately obtain the data of water-soluble substances in the discharged smoke;

[0033] S8: The continuous intake and exhaust of the U-shaped intake pipe is used to continuously provide compensation for the heat lost during the operation of S4 to S6 for the insulation shell, the preheating pipe, the first return pipe, the first intake pipe, the second intake pipe, the filter and the air collecting chamber in the insulation shell, and maintain the measurement temperature of the insulation shell, the preheating pipe, the first return pipe, the first intake pipe, the second intake pipe, the filter and the air collecting chamber in the insulation shell in any measurement mode of S4 to S6.

[0034] The beneficial effects of the present invention are as follows:

[0035] The flue gas emission continuous monitoring device provided by the present invention adopts an air intake mechanism of an air intake fan without active power and a multi-mode hierarchical measurement technology, which can effectively reduce the interference of flue gas monitoring and reduce the fluctuation of detection data. It also adopts multi-mode hierarchical measurement to improve the accuracy of flue gas monitoring, solves the problems of the existing flue gas emission detection system, such as the flue gas monitoring is easily disturbed, the detection data is easily fluctuated, and the lack of a multi-detection device operation mode switching technology, which leads to low flue gas monitoring accuracy, and has the following significant beneficial effects:

[0036] (1) Improve monitoring accuracy and stability: By using laser scattering sensors and fiber optic measurement units, the concentration and particle size distribution of particulate matter in flue gas can be accurately measured, as well as the gas composition and concentration in flue gas, to ensure the accuracy of monitoring data. Especially in complex industrial emission environments, the multi-mode measurement function of the flue gas emission continuous monitoring device can effectively avoid data fluctuations caused by environmental interference (such as water vapor, oil, particulate matter, etc.), reduce errors, and improve monitoring accuracy.

[0037] (2) The design of the air intake fan without active power optimizes energy utilization: By changing the flip angle of the air intake fan, the air intake volume is automatically adjusted under different exhaust conditions, maintaining a stable flue gas flow entering the U-shaped air intake pipe and the air collecting chamber. In addition, the air intake and flipping actions of the air intake fan do not require external electric drive. The flue gas discharged from the exhaust pipe is reasonably used as power to drive the air intake fan, which greatly reduces energy consumption and effectively avoids the dependence of traditional power devices such as compressors and vacuum pumps on electricity, reducing the energy consumption and maintenance cost of the flue gas emission continuous monitoring device.

[0038] (3) Multi-mode hierarchical measurement to achieve flexible monitoring: The gas collection chamber and controllable pipeline opening and closing design enable the continuous monitoring device of flue gas emissions to perform multi-mode and phased monitoring. By controlling the opening and closing of the preheating pipe, and different intake pipes and return pipes, the continuous monitoring device of flue gas emissions can continuously, periodically, and phasedly monitor the flue gas components under different working modes. This design not only ensures the adaptability of the continuous monitoring device of flue gas emissions under various working conditions, but also improves the flexibility and detection accuracy of each component when monitoring flue gas, so that in actual applications, the continuous monitoring device of flue gas emissions can be adjusted and optimized according to the needs of flue gas detection.

[0039] (4) Avoid corrosion problems caused by dissolved pollutants and extend the life of the equipment: By setting up an insulation shell and an air source unit, the continuous monitoring device for flue gas emissions can maintain the temperature of the flue gas when it flows through the pipeline and the detected components, prevent the moisture in the flue gas from precipitating and reacting with the acid gas to form an acidic liquid, and avoid corrosion of the components. This design can not only improve the monitoring accuracy and prevent secondary pollution of the continuous monitoring device for flue gas emissions by pollutants, but also extend the service life of the continuous monitoring device for flue gas emissions and reduce the frequency of component damage and maintenance.

[0040] (5) Improve the reliability and maintainability of the system: The design of the continuous monitoring device for flue gas emissions reduces the use of mechanical components such as traditional air pumps, avoids the impact of high temperature and corrosive environment on mechanical components, and reduces the failure rate of the continuous monitoring device for flue gas emissions. At the same time, the combination of the liquid sensing unit and the liquid collecting chamber can monitor the type and content of pollutants dissolved in the liquid in the flue gas, helping the continuous monitoring device for flue gas emissions to accurately monitor water-soluble pollutants.

[0041] (6) Environmental protection and intelligence: The flue gas emission continuous monitoring device can monitor and analyze the flue gas in real time through intelligent calculations, generate accurate emission reports, provide reliable emission data support for environmental protection departments, and help formulate scientific and effective emission control measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a structural schematic diagram of the smoke emission continuous monitoring device of the present invention;

[0044] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A.

[0045] The reference numerals are as follows:

[0046] 00. Exhaust pipe;

[0047] 1. Intake fan;

[0048] 2. U-shaped air intake pipe; 21. telescopic pipe; 22. connecting seat; 23. air intake section; 24. air collecting middle section; 25. exhaust section; 26. laser scattering sensor; 261. transmitting end; 262. receiving end; 27. preheating pipe; 271. preheating air intake valve;

[0049] 3. filter; 31. first air inlet pipe; 311. first air inlet valve; 32. second air inlet pipe; 321. second air inlet valve; 33. filter chamber; 34. collection tank;

[0050] 4. Gas collecting chamber; 41. First air inlet; 42. First air outlet; 421. First air return pipe; 422. First air outlet valve; 43. Second air inlet; 44. Second air outlet; 45. Measuring port;

[0051] 5. Fiber optic measurement unit;

[0052] 6. Gas source unit; 61. Gas supply pipe; 62. Gas supply valve; 63. Gas tank;

[0053] 7. Heat exchange radiator;

[0054] 8. Condenser pipe; 81. Second exhaust valve;

[0055] 91. Liquid collecting chamber; 911. Second air return pipe; 912. Drain valve; 913. Liquid level sensor; 92. Liquid sensing unit; 93. Insulation shell. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0057] A specific embodiment provides a continuous monitoring device and method for flue gas emissions, which realizes intake detection, cleaning of pipes and components through a U-shaped intake pipe, a preheating pipe, a first return air pipe, a first intake pipe, an air collecting chamber, a condenser, a liquid collecting chamber and a second return air pipe, and utilizes intake and exhaust preheating and insulation to achieve insulation measurement inside the insulation shell, pipes and components, effectively reducing interference from temperature, oil and particulate matter and improving monitoring accuracy; a laser scattering sensor is used to measure the concentration and particle size of particulate matter, and an optical fiber measurement unit is used to monitor other components in the flue gas, and real-time monitoring of the flue gas and analysis of emission components are achieved by collecting the released liquid and measuring the substances dissolved in the liquid; the problem of low flue gas monitoring accuracy caused by easy interference with flue gas monitoring, easy fluctuation of detection data and lack of multi-operation mode switching technology of the detection device is effectively solved.

[0058] In addition, all the contents of the configurations shown in the following embodiments are not necessarily limited to the solutions of the inventions described in the claims.

[0059] The first implementation example of the continuous monitoring device for flue gas emissions is Figure 1 and Figure 2 As shown, it includes an air intake fan 1 without active power, a U-shaped air intake pipe 2, a filter 3, an air collecting chamber 4, an optical fiber measurement unit 5, an air source unit 6, a heat exchange radiator 7, a condenser 8, a liquid collecting chamber 91, a liquid sensing unit 92 and a heat preservation shell 93; the U-shaped air intake pipe 2 is installed on the outer wall of the exhaust pipe 00 to be detected by pulling a code, the air intake end of the U-shaped air intake pipe 2 extends into the exhaust pipe 00, and the exhaust end of the U-shaped air intake pipe 2 is connected to the exhaust pipe 00 at the outer wall of the exhaust pipe 00;

[0060] The U-shaped air intake pipe 2 is provided with an air intake section 23, an air collecting middle section 24 and an exhaust section 25; the air intake section 23 is provided with a laser scattering sensor 26 for measuring the size data and concentration value of the particles entering the flue gas; the air collecting middle section 24 is connected to a preheating pipe 27 at a bend near the air intake section 23, and the preheating pipe 27 is connected to the first air intake port 41 of the air collecting chamber 4 in a controllable opening and closing manner; the two sides of the filter 3 are respectively connected to the first air intake pipe 31 and the second air intake pipe 32 in a controllable opening and closing manner, the first air intake pipe 31 is connected in parallel with the air intake side of the preheating pipe 27, and the second air intake pipe 32 is connected in parallel with the exhaust side of the preheating pipe 27 to communicate with the first air intake port 41; the measuring port 45 of the gas collecting chamber 4 is connected to the optical fiber measuring unit 5; the first exhaust port 42 of the gas collecting chamber 4 is connected to the first return air pipe 421 which can be controlled to open and close, the first return air pipe 421 is connected to the gas collecting middle section 24, and the first return air pipe 421 is arranged above the preheating pipe 27; the second air inlet 43 of the gas collecting chamber 4 is connected to the gas source unit 6, which is used to fill the gas collecting chamber 4 with inert clean gas, exhaust the flue gas accumulated in the gas collecting chamber 4, and flush the pipe of the U-shaped air inlet pipe 2 and the blades of the air inlet fan 1 with gas; the second exhaust port 44 of the gas collecting chamber 4 is connected to the condenser pipe 8 which can be controlled to open and close, and the condenser pipe 8 is connected to the liquid collecting chamber 9 1 is connected to cool the flue gas and collect the released liquid into the liquid collecting chamber 91; a heat exchange radiator 7 is installed outside the condenser 8 to assist in cooling the passing flue gas; the top of the liquid collecting chamber 91 is connected to the second return air pipe 911, and the second return air pipe 911 is connected to the exhaust pipe 00; the measuring end of the liquid sensor unit 92 extends into the liquid collecting chamber 91 to measure the type and content of the substance dissolved in the liquid; a drain valve 912 is installed at the bottom of the liquid collecting chamber 91; the insulation shell 93 wraps the U-shaped air inlet pipe 2, the filter 3, the air collecting chamber 4, the preheating pipe 27, the first air inlet pipe 31, the second air inlet pipe 32 and the first return air pipe 421, It is used for heat preservation to keep the incoming flue gas at a high temperature, prevent the release of moisture in the flue gas, and make the water-soluble acidic gas in the flue gas dissolve in the released moisture to avoid the formation of acidic liquid; by controlling the opening and closing of the preheating tube 27, the first air inlet pipe 31, the second air inlet pipe 32, the first return air pipe 421, the condenser 8 and the air source unit 6, the filter 3, the air collecting chamber 4 and the insulation shell 93 are preheated, and the laser scattering sensor 26 and the optical fiber measurement unit 5 continuously measure the flue gas, and periodically collect the liquid in the liquid collecting chamber 91 and measure it through the liquid sensing unit 92, thereby realizing multi-mode graded measurement.

[0061] In the vertical direction of the smoke exhaust pipe 00, the exhaust end of the U-shaped air intake pipe 2 is always located above the air intake end of the U-shaped air intake pipe 2. The laser scattering sensor 26 is provided with a transmitting end 261 and a receiving end 262, both of which are arranged on the air intake section 23 of the U-shaped air intake pipe 2.

[0062] Regarding the air intake volume control of the U-shaped air intake pipe 2 and the air intake fan 1, specifically, a telescopic tube 21 and a connecting seat 22 are provided on the air intake end of the U-shaped air intake pipe 2; the rotating end of the air intake fan 1 is rotatably connected to the connecting seat 22 of the air intake end of the U-shaped air intake pipe 2, and a torsion spring is installed on the rotating end. When the rising power of the smoke in the smoke exhaust pipe 00 is greater than the maximum required air intake volume of the air intake fan 1, the air intake fan 1 flips upward around the rotating end, and the flipping angle of the air intake fan 1 is positively correlated with the rising power of the smoke in the smoke exhaust pipe 00, which is used to maintain the air intake volume of the air intake end of the U-shaped air intake pipe 2 stable; the air outlet end of the air intake fan 1 is connected to the telescopic tube 21 at the air intake end of the U-shaped air intake pipe 2, which is used to supply smoke into the U-shaped air intake pipe 2.

[0063] Since the air intake fan 1 is driven by the rising smoke in the exhaust pipe 00, when the smoke discharged in the exhaust pipe is larger, the speed of the air intake fan 1 is higher, and the amount of smoke entering the U-shaped air intake pipe 2 is larger;

[0064] When the exhaust pipe is discharged normally, the air intake of the air intake fan 1 remains stable, and the rising power of the smoke in the exhaust pipe 00 is less than or equal to the maximum required air intake of the air intake fan 1, the rising power of the smoke in the exhaust pipe 00 does not exceed the maximum torque of the torsion spring, and the air intake fan 1 is in horizontal air intake;

[0065] When the exhaust pipe increases the discharge flow rate, the air intake of the intake fan 1 gradually increases with the increase of the speed of the intake fan 1. The rising power of the smoke in the exhaust pipe 00 is greater than the maximum required air intake of the intake fan 1. The rising power of the smoke in the exhaust pipe 00 exceeds the maximum torque of the torsion spring. The flipping angle of the intake fan 1 increases with the increase of the rising power of the smoke in the exhaust pipe 00. The intake fan 1 is in an inclined air intake, and the air intake volume is also reduced. That is, the greater the flipping angle of the intake fan 1, the smaller the amount of smoke entering the telescopic tube 21; thereby keeping the amount of smoke entering the air collecting chamber 4 stable, reducing the measurement data fluctuations of the laser scattering sensor 26 and the optical fiber measurement unit 5, and improving the accuracy and precision of the measurement data.

[0066] Specifically, the opening and closing structures of the above-mentioned multiple pipelines are as follows: Figure 1 As shown, a preheating air intake valve 271 is installed on the preheating pipe 27; a first air intake valve 311 is installed on the first air intake pipe 31, and a second air intake valve 321 is installed on the second air intake pipe 32; a first exhaust valve 422 is installed on the first return air pipe 421; a second exhaust valve 81 is installed on the condenser 8, and the second exhaust valve 81 is arranged on the condenser 8 between the second exhaust port 44 of the air collecting chamber 4 and the heat exchange radiator 7.

[0067] The flue gas emission continuous monitoring device provided by the present invention adopts an air intake mechanism of an air intake fan 1 without active power and a multi-mode hierarchical measurement technology, which can effectively reduce the interference of flue gas monitoring and reduce the fluctuation of detection data. It also adopts multi-mode hierarchical measurement to improve the accuracy of flue gas monitoring, solves the problems of the existing flue gas emission detection system, such as the flue gas monitoring is easily disturbed, the detection data is easily fluctuated, and there is a lack of a multi-detection device operation mode switching technology, which leads to low flue gas monitoring accuracy. The device has the following significant beneficial effects:

[0068] (1) Improving monitoring accuracy and stability: By using the laser scattering sensor 26 and the optical fiber measurement unit 5, the concentration and particle size distribution of particulate matter in the flue gas can be accurately measured, as well as the gas composition and concentration in the flue gas, to ensure the accuracy of the monitoring data. Especially in complex industrial emission environments, the multi-mode measurement function of the flue gas emission continuous monitoring device can effectively avoid data fluctuations caused by environmental interference (such as water vapor, oil, particulate matter, etc.), reduce errors, and improve monitoring accuracy.

[0069] (2) The design of the air intake fan 1 without active power optimizes energy utilization: By changing the flip angle of the air intake fan 1, the air intake volume is automatically adjusted under different exhaust conditions, maintaining a stable flue gas flow rate entering the U-shaped air intake pipe 2 and the air collecting chamber 4. In addition, the air intake and flipping actions of the air intake fan 1 do not require external electric drive. The flue gas discharged from the exhaust pipe 00 is reasonably used as power to drive the air intake fan 1, which greatly reduces energy consumption and effectively avoids the dependence of traditional power devices such as compressors and vacuum pumps on electricity, reducing the energy consumption and maintenance cost of the flue gas emission continuous monitoring device.

[0070] (3) Multi-mode hierarchical measurement to achieve flexible monitoring: The gas collecting chamber 4 and the controllable pipeline opening and closing design enable the continuous monitoring device for flue gas emissions to perform multi-mode and staged monitoring. By controlling the opening and closing of the preheating tube 27 and different intake and return pipes, the continuous monitoring device for flue gas emissions can continuously, periodically, and stagedly monitor the flue gas components under different working modes. This design not only ensures the adaptability of the continuous monitoring device for flue gas emissions under various working conditions, but also improves the flexibility and detection accuracy of each component when monitoring flue gas, so that in actual applications, the continuous monitoring device for flue gas emissions can be adjusted and optimized according to the needs of flue gas detection.

[0071] (4) Avoiding corrosion problems caused by dissolution of pollutants and extending the life of the equipment: By providing the insulation shell 93 and the gas source unit 6, the continuous monitoring device for flue gas emissions can maintain the temperature of the flue gas when it flows through the pipeline and the detected components, preventing the moisture in the flue gas from precipitating and reacting with the acid gas to form an acidic liquid, thereby avoiding corrosion of the components. This design can not only improve the monitoring accuracy and prevent the secondary pollution of the continuous monitoring device for flue gas emissions by pollutants, but also extend the service life of the continuous monitoring device for flue gas emissions and reduce the frequency of component damage and maintenance.

[0072] (6) Improve the reliability and maintainability of the system: The design of the continuous monitoring device for flue gas emissions reduces the use of mechanical components such as traditional air pumps, avoids the impact of high temperature and corrosive environment on mechanical components, and reduces the failure rate of the continuous monitoring device for flue gas emissions. At the same time, the combination of the liquid sensor unit 92 and the liquid collecting chamber 91 can monitor the type and content of pollutants dissolved in the liquid in the flue gas, helping the continuous monitoring device for flue gas emissions to accurately monitor water-soluble pollutants.

[0073] (7) Environmental protection and intelligence: The flue gas emission continuous monitoring device can conduct real-time monitoring and data analysis of flue gas through intelligent calculations, generate accurate emission reports, provide reliable emission data support for environmental protection departments, and help formulate scientific and effective emission control measures.

[0074] In summary, the present invention improves the accuracy of flue gas monitoring by reducing the interference to flue gas monitoring, reducing the fluctuation of detection data, and adopting multi-mode graded measurement, thereby solving the problems of existing flue gas emission detection systems, such as easy interference to flue gas monitoring, easy fluctuation of detection data, and lack of multi-detection device operation mode switching technology, which leads to low flue gas monitoring accuracy. It thereby improves the accuracy of flue gas monitoring, optimizes energy utilization, increases the reliability of continuous flue gas emission monitoring devices, and reduces maintenance costs, and is of great significance to improving the level of industrial pollution monitoring.

[0075] As one optional implementation,

[0076] Regarding the function of the above-mentioned optical fiber measuring unit 5, the optical fiber measuring unit 5 is used to measure the concentrations of sulfur dioxide, hydrogen sulfide, nitrogen oxides, carbon dioxide, and carbon monoxide contained in the flue gas collected in the gas collecting chamber 4; in order to measure the above-mentioned sulfur dioxide, hydrogen sulfide, nitrogen oxides, carbon dioxide, and carbon monoxide, the optical fiber measuring unit 5 includes a plurality of optical fiber chemical sensors, which respectively measure nitrogen oxides, carbon dioxide, carbon monoxide and acidic gases such as hydrogen sulfide and sulfur dioxide.

[0077] Regarding the specific structure of the gas source unit 6, this embodiment Figure 1As shown, the air source unit 6 includes an air supply pipe 61, an air supply valve 62 and an air tank 63; the two ends of the air supply pipe 61 are respectively connected to the second air inlet 43 of the air collecting chamber 4 and the air tank 63; the air supply valve 62 is installed on the air supply pipe 61 to control the opening and closing of the air supply pipe 61.

[0078] Regarding the above-mentioned condenser 8, liquid collecting chamber 91, and liquid measuring steps, this embodiment is as follows: Figure 1 and Figure 2 As shown, the condenser 8 is connected to the lower part of the liquid collecting chamber 91; the liquid collecting chamber 91 is installed with a liquid level sensor 913 for monitoring the liquid level in the liquid collecting chamber 91; when the liquid level of the liquid collecting chamber 91 reaches the measurement level, the liquid sensing unit 92 is started to measure; when the liquid level of the liquid collecting chamber 91 reaches the drainage level and the measurement of the liquid sensing unit 92 is stopped, the drain valve 912 is controlled to open for drainage, and after the liquid level sensor 913 sends back the lowest liquid level information, the drain valve 912 is closed.

[0079] Regarding the structure of the filter 3 and the replaceable collection structure, this embodiment is as follows Figure 1 As shown, the filter 3 includes a filter chamber 33 and a collection tank 34. The air intake and exhaust sides of the upper part of the filter chamber 33 are connected to the first air intake pipe 31 and the second air intake pipe 32 respectively. The lower part of the filter chamber 33 is detachably connected to the collection tank 34. The collection tank 34 is used to collect the filtered oil and particulate matter.

[0080] During application, a detachable collecting tank 34 is designed. When the filter chamber 33 is full of oil and particulate matter collected in the flue gas, the collecting tank 34 can be directly removed and replaced for maintenance. At the same time, the filter element of the filter chamber 33 is also replaced from the port of the removed collecting tank 34, thereby ensuring the filtering performance of the filter 3, further improving the accuracy and precision of the measurement data of the optical fiber measurement unit 5 and the liquid level sensor 913, and preventing the oil and particulate matter in the flue gas from affecting the measurement data.

[0081] The second embodiment of the continuous monitoring device for flue gas emissions is different from the first embodiment in that the liquid sensing unit 92 includes a pH sensor and an oxidation-reduction potential (ORP) sensor, and the pH sensor and the oxidation-reduction potential sensor are combined for measuring and determining the type and content of the acidic substance contained in the liquid collected in the liquid collecting chamber 91.

[0082] When in use, the measuring end of the pH sensor is inserted into the solution to be tested, and a corresponding electrical signal is generated according to the pH value of the solution, thereby directly reading the pH value of the solution; the oxidation-reduction potential (ORP) sensor measures the information of the redox state in the liquid, and combined with the data obtained by the pH sensor, it is very useful to determine the presence and concentration of specific acidic substances through calculation and combined analysis, thereby measuring the type and content (concentration) of the acidic substances contained in the liquid collected in the liquid collection chamber 91.

[0083] The third embodiment of the flue gas emission continuous monitoring device is different from the first embodiment in that the liquid sensing unit 92 includes an ultrasonic sensor, which is used to determine and measure the type and content of the acidic substance contained in the liquid collected in the liquid collecting chamber 91.

[0084] When used, the ultrasonic sensor can analyze the composition of the mixture in the liquid based on the ultrasonic measurement principle and provide concentration or density information in real time, thereby measuring the type and content (concentration) of the acidic substance contained in the liquid collected in the liquid collection chamber 91.

[0085] Based on the above embodiment of the continuous monitoring device for flue gas emissions, a monitoring method is provided, comprising the following steps: S1: in a first preheating mode, closing the first air intake pipe, the second air intake pipe, the condenser pipe and the air source unit, opening the preheating pipe and the first air return pipe, and dynamically passing flue gas to heat the preheating pipe, the first air return pipe and the air collecting chamber;

[0086] S2: In the second preheating mode, the preheating pipe, the condensing pipe and the gas source unit are closed, the first return air pipe, the first air inlet pipe and the second air inlet pipe are opened, and flue gas is dynamically introduced to heat the first air inlet pipe, the second air inlet pipe and the filter;

[0087] S3: The heat preservation shell absorbs the heat when the first preheating mode and the second preheating mode are running, and the temperature inside the heat preservation shell is increased, so that the heat preservation shell, the preheating pipe, the first return air pipe, the first air intake pipe, the second air intake pipe, the filter and the air collecting chamber inside the heat preservation shell reach the measurement temperature;

[0088] S4: In the first measurement mode: first, close the first air return pipe, the first air inlet pipe, the second air inlet pipe, the condenser pipe and the air source unit, and open the preheating pipe for at least 5 minutes; then open the first air return pipe, start the laser scattering sensor and the optical fiber measurement unit to perform preliminary continuous measurement of the flue gas;

[0089] S5: In the second measurement mode: first close the preheating tube, the first air inlet tube, the second air inlet tube and the condenser tube; open the first air return tube and the air source unit, and blow air into the air collecting chamber through the air source unit at least twice, each time for at least 3 seconds;

[0090] Then close the first air return pipe and the air source unit, open the first air inlet pipe and the second air inlet pipe for at least 10 minutes; then open the first air return pipe for at least 5 minutes, start the laser scattering sensor and the optical fiber measurement unit to perform secondary correction measurement on the flue gas, measure the data of the gas without oil, particulate matter and other impurities in the smoke, and reduce the influence of oil, particulate matter and other impurities mixed in the smoke directly measured in step S4;

[0091] S6: In the third measurement mode: first, close the preheating tube, the first air inlet tube, the second air inlet tube and the condenser tube; open the first air return tube and the air source unit, and blow air into the air collecting chamber through the air source unit at least twice, each time for at least 3 seconds;

[0092] Then close the preheating pipe, the first air return pipe, the air source unit and the condenser pipe, and open the first air inlet pipe and the second air inlet pipe for at least 10 minutes; then open the condenser pipe, the liquid collecting chamber starts to collect liquid, and the laser scattering sensor and the optical fiber measurement unit are started to continuously measure the flue gas; when the liquid level in the liquid collecting chamber reaches the measurement level, the liquid sensing unit is started to measure;

[0093] The laser scattering sensor and the optical fiber measurement unit are used to measure the periodic data of the flue gas under the negative pressure state of the liquid collection, and the type and content data of the water-soluble substances are obtained through the liquid sensing unit;

[0094] S7: The first measurement mode of step S4 is a preliminary continuous measurement to obtain continuous monitoring data; the second measurement mode of step S5 is a secondary correction measurement to measure the correction data without the influence of debris such as oil and particles;

[0095] When the continuous monitoring data acquired for more than 10 minutes in the measurement mode of step S4 shows an over-standard warning, the measurement mode of step S5 is started to acquire the corrected data. When the acquired corrected data does not show an over-standard warning for at least 5 minutes, the measurement mode is switched to the measurement mode of step S4;

[0096] The measurement mode of step S6 is performed at least three times from the start of the smoke exhaust pipe to the stop of the smoke exhaust pipe during the day to accurately obtain the data of water-soluble substances in the discharged smoke;

[0097] S8: The continuous intake and exhaust of the U-shaped intake pipe is used to continuously provide compensation for the heat lost during the operation of S4 to S6 for the insulation shell, the preheating pipe, the first return pipe, the first intake pipe, the second intake pipe, the filter and the air collecting chamber in the insulation shell, and maintain the measurement temperature of the insulation shell, the preheating pipe, the first return pipe, the first intake pipe, the second intake pipe, the filter and the air collecting chamber in the insulation shell in any measurement mode of S4 to S6.

[0098] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. A continuous monitoring device for flue gas emissions, characterized in that: It includes an air intake fan without active power, a U-shaped air intake pipe, a filter, an air collecting chamber, an optical fiber measuring unit, an air source unit, a heat exchange radiator, a condenser, a liquid collecting chamber, a liquid sensing unit and a heat insulation shell; The U-shaped air intake pipe is installed on the outer wall of the smoke exhaust pipe to be detected through a pull code, the air intake end of the U-shaped air intake pipe extends into the smoke exhaust pipe, and the exhaust end of the U-shaped air intake pipe is connected to the smoke exhaust pipe at the outer wall of the smoke exhaust pipe; The air inlet end of the U-shaped air inlet pipe is provided with a telescopic pipe and a connecting seat; The rotating end of the air intake fan is rotatably connected to the connecting seat, and a torsion spring is installed on the rotating end. When the rising power of the smoke in the exhaust pipe is greater than the maximum required air intake of the air intake fan, the air intake fan turns upward around the rotating end. The turning angle of the air intake fan is positively correlated with the rising power of the smoke in the exhaust pipe, so as to maintain the air intake of the air intake end of the U-shaped air intake pipe stable. The air outlet end of the air intake fan is in communication with the telescopic pipe, and is used to supply smoke into the U-shaped air intake pipe; The U-shaped air intake pipe is provided with an air intake section, an air collecting middle section and an air exhaust section; the air intake section is provided with a laser scattering sensor for measuring the size data and concentration value of particles entering the flue gas; The middle section of the gas collection chamber is connected to a preheating pipe at a bend adjacent to the air inlet section, and the preheating pipe is connected to the first air inlet of the gas collection chamber in a controllable opening and closing manner; The two sides of the filter are respectively connected with a first air intake pipe and a second air intake pipe in a controllable opening and closing manner, the first air intake pipe is connected in parallel with the air intake side of the preheating pipe, and the second air intake pipe is connected in parallel with the exhaust side of the preheating pipe and communicates with the first air intake port; The measuring port of the gas collecting chamber is connected to the optical fiber measuring unit; The first exhaust port of the gas collecting chamber is connected to a first return air pipe which can be controlled to open and close, the first return air pipe is connected to the gas collecting middle section, and the first return air pipe is arranged above the preheating pipe; The second air inlet of the air collecting chamber is connected to the air source unit, and is used to fill the air collecting chamber with inert clean gas, exhaust the smoke accumulated in the air collecting chamber, and perform gas flushing on the pipe of the U-shaped air inlet pipe and the blades of the air intake fan; The second exhaust port of the gas collecting chamber is connected to a condenser pipe that can be controlled to open and close, and the condenser pipe is connected to the liquid collecting chamber, and is used to cool the flue gas and collect the released liquid into the liquid collecting chamber; a heat exchange radiator is installed outside the condenser pipe to assist in cooling the passing flue gas; the top of the liquid collecting chamber is connected to a second air return pipe, and the second air return pipe is connected to the smoke exhaust pipe; the measuring end of the liquid sensor unit extends into the liquid collecting chamber, and is used to measure the type and content of the substance dissolved in the liquid; a drain valve is installed at the bottom of the liquid collecting chamber; The heat-insulating shell wraps the U-shaped air inlet pipe, the filter, the air collecting chamber, the preheating pipe, the first air inlet pipe, the second air inlet pipe and the first air return pipe, and is used for heat preservation to keep the incoming flue gas at a relatively high temperature, prevent the release of water in the flue gas, and make the water-soluble acidic gas in the flue gas dissolve in the released water to avoid the formation of acidic liquid; By controlling the opening and closing of the preheating pipe, the first air inlet pipe, the second air inlet pipe, the first return air pipe, the condenser pipe and the air source unit, the filter, the air collecting chamber and the insulation shell are preheated, and the laser scattering sensor and the optical fiber measuring unit continuously measure the flue gas, and the liquid in the liquid collecting chamber is periodically collected and measured by the liquid sensing unit, thereby realizing multi-mode graded measurement.

2. The continuous monitoring device for flue gas emissions according to claim 1, characterized in that: Along the vertical direction of the smoke exhaust pipe, the exhaust end of the U-shaped air intake pipe is always located above the air intake end of the U-shaped air intake pipe.

3. The continuous monitoring device for flue gas emissions according to claim 1, characterized in that: The liquid sensing unit includes a pH sensor and an oxidation-reduction potential sensor, which are used to determine and measure the type and content of the acidic substance contained in the liquid collected in the liquid collecting chamber.

4. The continuous monitoring device for flue gas emissions according to claim 1, characterized in that: The optical fiber measuring unit is used to measure the concentrations of sulfur dioxide, hydrogen sulfide, nitrogen oxides, carbon dioxide and carbon monoxide contained in the flue gas collected in the gas collecting chamber.

5. The continuous monitoring device for flue gas emissions according to claim 4, characterized in that: The fiber optic measurement unit includes a plurality of fiber optic chemical sensors.

6. The continuous monitoring device for flue gas emissions according to claim 1, characterized in that: The gas source unit comprises an air supply pipe, an air supply valve and a gas tank; The two ends of the air supply pipe are respectively connected to the second air inlet of the air collecting chamber and the air tank; the air supply valve is installed on the air supply pipe to control the opening and closing of the air supply pipe.

7. The continuous monitoring device for flue gas emissions according to claim 1, characterized in that: The condenser is connected to the lower part of the liquid collecting chamber; The liquid collecting chamber is equipped with a liquid level sensor for monitoring the liquid level in the liquid collecting chamber; When the liquid level in the liquid collecting chamber reaches the measurement level, the liquid sensing unit is started for measurement; when the liquid level in the liquid collecting chamber reaches the drainage level and the measurement of the liquid sensing unit is stopped, the drainage valve is controlled to open for drainage, and after the liquid level sensor returns the minimum liquid level information, the drainage valve is closed.

8. The continuous monitoring device for flue gas emissions according to claim 1, characterized in that: The preheating pipe is provided with a preheating intake valve; the first intake pipe is provided with a first intake valve, the second intake pipe is provided with a second intake valve; the first return air pipe is provided with a first exhaust valve; The condenser is provided with a second exhaust valve, which is arranged on the condenser pipe between the second exhaust port of the air collecting chamber and the heat exchange radiator.

9. The continuous monitoring device for flue gas emissions according to claim 1, characterized in that: The filter includes a filter chamber and a collection tank. The air intake and exhaust sides of the upper portion of the filter chamber are respectively connected to the first air intake pipe and the second air intake pipe. The lower portion of the filter chamber is detachably connected to the collection tank. The collection tank is used to collect filtered oil and particulate matter.

10. A monitoring method for the flue gas emission continuous monitoring device according to claim 2, characterized in that: The following steps are involved: S1: In the first preheating mode, the first air inlet pipe, the second air inlet pipe, the condenser pipe and the air source unit are closed, the preheating pipe and the first air return pipe are opened, and the flue gas is dynamically introduced to heat the preheating pipe, the first air return pipe and the air collecting chamber; S2: In the second preheating mode, the preheating pipe, the condensing pipe and the gas source unit are closed, the first return air pipe, the first air inlet pipe and the second air inlet pipe are opened, and flue gas is dynamically introduced to heat the first air inlet pipe, the second air inlet pipe and the filter; S3: The heat preservation shell absorbs the heat when the first preheating mode and the second preheating mode are running, and the temperature inside the heat preservation shell is increased, so that the heat preservation shell, the preheating pipe, the first return air pipe, the first air intake pipe, the second air intake pipe, the filter and the air collecting chamber inside the heat preservation shell reach the measurement temperature; S4: In the first measurement mode: first, close the first air return pipe, the first air inlet pipe, the second air inlet pipe, the condenser pipe and the air source unit, and open the preheating pipe for at least 5 minutes; then open the first air return pipe, start the laser scattering sensor and the optical fiber measurement unit to perform preliminary continuous measurement of the flue gas; S5: In the second measurement mode: first close the preheating tube, the first air inlet tube, the second air inlet tube and the condenser tube; open the first air return tube and the air source unit, and blow air into the air collecting chamber through the air source unit at least twice, each time for at least 3 seconds; Then close the first air return pipe and the air source unit, open the first air inlet pipe and the second air inlet pipe for at least 10 minutes; open the first air return pipe for at least 5 minutes, start the laser scattering sensor and the optical fiber measurement unit to perform secondary correction measurement on the flue gas, measure the data of the gas without oil, particulate matter and debris in the smoke, and reduce the influence of oil, particulate matter and debris mixed in the smoke directly measured in step S4; S6: In the third measurement mode: first, close the preheating tube, the first air inlet tube, the second air inlet tube and the condenser tube; open the first air return tube and the air source unit, and blow air into the air collecting chamber through the air source unit at least twice, each time for at least 3 seconds; Then close the preheating pipe, the first air return pipe, the air source unit and the condenser pipe, and open the first air inlet pipe and the second air inlet pipe for at least 10 minutes; then open the condenser pipe, the liquid collecting chamber starts to collect liquid, and the laser scattering sensor and the optical fiber measurement unit are started to continuously measure the flue gas; when the liquid level in the liquid collecting chamber reaches the measurement level, the liquid sensing unit is started to measure; The laser scattering sensor and the optical fiber measurement unit are used to measure the periodic data of the flue gas under the negative pressure state of the liquid collection, and the type and content data of the water-soluble substances are obtained through the liquid sensing unit; S7: The first measurement mode of step S4 is a preliminary continuous measurement to obtain continuous monitoring data; the second measurement mode of step S5 is a secondary correction measurement to measure the correction data without the influence of oil, particles and debris; When the continuous monitoring data acquired for more than 10 minutes in the measurement mode of step S4 shows an over-standard warning, the measurement mode of step S5 is started to acquire the corrected data. When the acquired corrected data does not show an over-standard warning for at least 5 minutes, the measurement mode is switched to the measurement mode of step S4; The measurement mode of step S6 is performed at least three times from the start of the smoke exhaust pipe to the stop of the smoke exhaust pipe during the day to accurately obtain the data of water-soluble substances in the discharged smoke; S8: The continuous intake and exhaust of the U-shaped intake pipe is used to continuously provide compensation for the heat lost during the operation of S4 to S6 for the insulation shell, the preheating pipe, the first return pipe, the first intake pipe, the second intake pipe, the filter and the air collecting chamber in the insulation shell, and maintain the measurement temperature of the insulation shell, the preheating pipe, the first return pipe, the first intake pipe, the second intake pipe, the filter and the air collecting chamber in the insulation shell in any measurement mode of S4 to S6.

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