Real-time online detection device and method for reducing atmosphere in near-wall area of water cooling wall of boiler

Abstract

The invention relates to the technical field of safety monitoring, in particular to a real-time online detection device and method for a reducing atmosphere in a near-wall area of a water-cooled wall of a boiler, and the device comprises a flue gas sampling module which is used for collecting an initial flue gas sample meeting a preset representative condition in the near-wall area of the water-cooled wall; the flue gas filtering module is connected with the flue gas sampling module and is used for filtering impurities in the initial flue gas sample to generate a flue gas sample to be detected; and the component measuring module is connected with the flue gas filtering module and is used for analyzing the concentration of at least one key reducing gas in the flue gas sample to be detected and generating a water-cooled wall high-temperature corrosion risk assessment report of the reducing gas in the near-wall area of the water-cooled wall of the boiler according to the concentration of at least one key reducing gas. According to the method, the concentration of key reducing gases such as carbonyl sulfide, hydrogen sulfide and carbon monoxide in the high-temperature reducing atmosphere of the near-wall area of the water-cooled wall can be monitored in real time, and a water-cooled wall high-temperature corrosion risk assessment report of the reducing gases of the near-wall area of the water-cooled wall of the boiler is generated.

Description

Technical Field

[0001] This application relates to the field of safety monitoring, and in particular to a real-time online detection device and method for reducing atmosphere in the near-wall region of a boiler water-cooled wall. Background Technology

[0002] The high-temperature reducing atmosphere (containing carbonyl sulfide COS, hydrogen sulfide H2S and carbon monoxide CO) in the near-wall region of the water-cooled wall is the main factor inducing sulfate / sulfide corrosion.

[0003] Among related technologies, the detection methods for high-temperature reducing atmosphere in the near-wall region of water-cooled walls mainly include laser spectroscopy (such as TDLAS (Tunable Diode Laser Absorption Spectroscopy)) for real-time online measurement of gas concentrations such as CO and H2S, electrochemical methods for direct measurement of corrosion rate, multi-point sampling combined with offline analysis to obtain key components, thermal parameter extrapolation to indirectly reflect the corrosion effect, and numerical simulation to construct corrosion prediction models.

[0004] However, in related technologies, the detection methods for high-temperature reducing atmosphere in the near-wall region of water-cooled walls mostly focus on the detection process, failing to effectively avoid the impact of flue gas temperature changes on the detection. Furthermore, in actual shutdown inspections, single spectral or electrochemical sensors are often used for measurement, resulting in the depth of high-temperature corrosion pits in water-cooled walls generally exceeding the design allowable value. Relying solely on detecting H2S / CO concentrations and assessing the corrosion status of water-cooled walls based on this significantly reduces effectiveness and accuracy, failing to accurately reflect the corrosion status of water-cooled walls and thus causing the protection strategy to fail, which urgently needs to be addressed. Summary of the Invention

[0005] This application provides a real-time online detection device and method for reducing atmosphere in the near-wall region of a boiler water-cooled wall. This addresses the problems in related technologies, where detection methods for high-temperature reducing atmosphere in the near-wall region of water-cooled walls often focus on the detection process, failing to effectively avoid the impact of flue gas temperature changes on the detection. Furthermore, these methods often employ single-spectral or electrochemical sensors, which can only detect the concentration of H2S / CO and assess the corrosion status of the water-cooled wall accordingly. This significantly reduces effectiveness and accuracy, failing to accurately reflect the corrosion status of the water-cooled wall and leading to the failure of protection strategies.

[0006] The first aspect of this application provides a real-time online detection device for the reducing atmosphere in the near-wall region of a boiler water-cooled wall, comprising: a flue gas sampling module for collecting an initial flue gas sample from the near-wall region of the water-cooled wall that meets preset representative conditions; a flue gas filtration module connected to the flue gas sampling module for filtering impurities in the initial flue gas sample to generate a flue gas sample to be tested; and a component measurement module connected to the flue gas filtration module for analyzing the concentration of at least one key reducing gas in the flue gas sample to be tested, and generating a high-temperature corrosion risk assessment report of the reducing gas in the near-wall region of the boiler water-cooled wall based on the concentration of the at least one key reducing gas, wherein the at least one key reducing gas includes at least one of carbonyl sulfide, hydrogen sulfide, and carbon monoxide.

[0007] Optionally, in one embodiment of this application, it further includes: an emission processing module for emitting the flue gas sample to be tested.

[0008] Optionally, in one embodiment of this application, the flue gas sampling module includes: at least one multi-layer composite sampling tube, wherein the multi-layer composite sampling tube includes, from the inside out, an inner lining layer, a gradient transition layer, an Inconel 625 base tube layer, a metal-clad MI heat tracing layer, a SiO2 aerogel insulation layer, and an Inconel 625 foil protective layer, and the preset representative conditions include the sampling port being located in the 0~10mm region of the water-cooled wall on the fire side.

[0009] Optionally, in one embodiment of this application, the flue gas filtration module includes: a dual-chamber housing, the cylindrical pressure-bearing structure of the housing having a built-in thermal expansion bellows to divide it into two independent semi-cylindrical chambers, and the two independent semi-cylindrical chambers sharing a top purified gas outlet; a metal fiber filter element, the metal fiber filter element including a gradient pore filter cartridge disposed in each chamber; and a backflushing cleaning unit, the backflushing cleaning unit including a Venturi nozzle disposed on the top of the metal fiber filter element for cleaning with nitrogen pulses.

[0010] Optionally, in one embodiment of this application, the flue gas filtration module further includes: a constant temperature heat tracing unit for maintaining the flue gas temperature within a preset range; and a sealed ash removal unit for providing sealed ash removal.

[0011] Optionally, in one embodiment of this application, the component measurement module includes: a laser system; a dual-channel Herriott cell; and a signal processing system.

[0012] A second aspect of this application provides a real-time online detection method for reducing atmosphere in the near-wall region of a boiler water-cooled wall, employing the real-time online detection device for reducing atmosphere in the near-wall region of a boiler water-cooled wall as described above. The method includes the following steps: collecting an initial flue gas sample from the near-wall region of the water-cooled wall; filtering impurities from the initial flue gas sample to generate a flue gas sample to be tested; generating an optical signal corresponding to at least one key reducing gas based on at least one key reducing gas in the flue gas sample to be tested and a laser; converting the optical signal corresponding to the at least one key reducing gas into an electrical signal corresponding to the at least one key reducing gas; and calculating the concentration of the at least one key reducing gas based on the electrical signal corresponding to the at least one key reducing gas.

[0013] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement a real-time online detection method for the reducing atmosphere in the near-wall region of a boiler water-cooled wall as described in the above embodiments.

[0014] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for real-time online detection of reducing atmosphere in the near-wall region of a boiler water-cooled wall.

[0015] A fifth aspect of this application provides a computer program product, including a computer program that, when executed, is used to implement the above-described method for real-time online detection of reducing atmosphere in the near-wall region of a boiler water-cooled wall.

[0016] The embodiments of this application can monitor in real time the concentration of key reducing gases such as carbonyl sulfide (COS), hydrogen sulfide (H2S), and carbon monoxide (CO) in the high-temperature reducing atmosphere near the water-cooled wall, and generate a high-temperature corrosion risk assessment report of the reducing gases in the near-wall area of ​​the boiler water-cooled wall. This system enables precise location and extraction of representative flue gas samples from the near-wall region of the water-cooled wall using a flue gas sampling module with high-temperature and corrosion-resistant sampling tubes. A flue gas filtration module efficiently removes dust and unburned coal particles from the flue gas, ensuring that subsequent precision analytical instruments are protected from contamination and wear, thus guaranteeing the accuracy of the test data. Finally, a component measurement module analyzes the concentrations of key reducing gases such as COS, H2S, and carbon monoxide (CO) in the filtered flue gas in real time online. Temperature control is maintained throughout the entire process from sampling to analysis to prevent chemical reactions of the tested flue gas components as the flue gas temperature decreases, effectively avoiding distortion of the reducing atmosphere concentration due to temperature fluctuations. This system achieves accurate real-time online measurement of key reducing gases in the high-temperature flue gas near the water-cooled wall of the furnace and provides COS concentration determination. This provides an important new basis for assessing and warning of high-temperature corrosion of the water-cooled wall, and provides crucial data support for timely implementation of targeted protective measures for the water-cooled wall, thereby effectively mitigating and preventing high-temperature corrosion of the water-cooled wall and ensuring the long-term safe, stable, and environmentally friendly operation of the boiler. This addresses the problems in related technologies, such as the fact that many methods for detecting high-temperature reducing atmosphere in the near-wall region of water-cooled walls focus on the detection process and fail to effectively avoid the impact of flue gas temperature changes on the detection. Furthermore, many methods use single-spectral or electrochemical sensors, which can only detect the concentration of H2S / CO and assess the corrosion status of the water-cooled wall accordingly. This significantly reduces the effectiveness and accuracy of the methods, making it impossible to accurately reflect the corrosion status of the water-cooled wall and thus leading to the failure of protection strategies.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of a real-time online detection device for reducing atmosphere in the near-wall region of a boiler water-cooled wall, according to an embodiment of this application. Figure 2 This is a schematic diagram of the structure of a real-time online detection device for reducing gases in the near-wall region of the water-cooled wall of a boiler furnace on the fire side, according to an embodiment of this application. Figure 3 This is a schematic diagram of the component measurement module structure according to one embodiment of this application; Figure 4This is a flowchart of a method for real-time online detection of reducing atmosphere in the near-wall region of a boiler water-cooled wall according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application.

[0019] Figure label: 10 - Real-time online detection device for reducing atmosphere in the near-wall zone of boiler water-cooled wall; 100 - Flue gas sampling module; 200 - Flue gas filtration module; 300 - Composition measurement module. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0021] The following describes a real-time online detection device and method for reducing atmosphere in the near-wall region of a boiler water-cooled wall, referring to the accompanying drawings. In contrast to the related technologies mentioned in the background section, the detection methods for high-temperature reducing atmosphere in the near-wall region of water-cooled walls often focus on the detection process, failing to effectively avoid the impact of flue gas temperature changes on the detection. Furthermore, they often employ single-spectral or electrochemical sensors, which can only detect the concentration of H2S / CO and assess the corrosion status accordingly, significantly reducing effectiveness and accuracy. This results in a failure to accurately reflect the corrosion status of the water-cooled wall, leading to the ineffectiveness of protection strategies. This application provides a real-time online detection device and method for reducing atmosphere in the near-wall region of a boiler water-cooled wall. In this device, the concentrations of key reducing gases such as carbonyl sulfide (COS), hydrogen sulfide (H2S), and carbon monoxide (CO) in the high-temperature reducing atmosphere near the water-cooled wall can be monitored in real time, generating a high-temperature corrosion risk assessment report for the reducing gases in the near-wall region of the boiler water-cooled wall. This system enables precise location and extraction of representative flue gas samples from the near-wall area of ​​the water-cooled wall using a flue gas sampling module with high-temperature and corrosion-resistant sampling tubes. A flue gas filtration module efficiently removes dust and unburned coal particles from the flue gas, ensuring that subsequent precision analytical instruments are protected from contamination and wear, thus guaranteeing the accuracy of the test data. Finally, a component measurement module analyzes the concentrations of key reducing gases such as COS, H2S, and carbon monoxide (CO) in the filtered flue gas in real time online. Temperature control is maintained throughout the entire process from sampling to analysis to prevent chemical reactions of the tested flue gas components as the flue gas temperature decreases, effectively avoiding distortion of the reducing atmosphere concentration due to temperature fluctuations. This system achieves accurate real-time online measurement of key reducing gases in the high-temperature flue gas near the water-cooled wall of the furnace and provides COS concentration determination. This provides an important new basis for assessing and warning of high-temperature corrosion of the water-cooled wall, and provides crucial data support for timely implementation of targeted protective measures, thereby effectively mitigating and preventing high-temperature corrosion of the water-cooled wall and ensuring the long-term safe, stable, and environmentally friendly operation of the boiler. This addresses the problems in related technologies, such as the fact that many methods for detecting high-temperature reducing atmosphere in the near-wall region of water-cooled walls focus on the detection process and fail to effectively avoid the impact of flue gas temperature changes on the detection. Furthermore, many methods use single-spectral or electrochemical sensors for measurement, which can only detect the concentration of H2S / CO and assess the corrosion status accordingly. This significantly reduces the effectiveness and accuracy of the methods, making it impossible to truly reflect the corrosion status of the water-cooled wall and thus leading to the failure of protection strategies.

[0022] Specifically, Figure 1 This is a schematic diagram of the structure of a real-time online detection device for the reducing atmosphere in the near-wall region of a boiler water-cooled wall, provided in an embodiment of this application.

[0023] like Figure 1 As shown, the real-time online detection device for the reducing atmosphere in the near-wall region of the boiler water-cooled wall includes: The flue gas sampling module 100 is used to collect initial flue gas samples from the near-wall region of the water-cooled wall that meet preset representative conditions.

[0024] Those skilled in the art will understand that in large coal-fired boilers, severe high-temperature corrosion can occur in the near-wall zone (typically 0-10 mm from the water-cooled wall surface) on the fire side of the water-cooled wall, leading to thinning of the water-cooled wall tubes, leakage, and even tube rupture accidents. The high-temperature reducing atmosphere (containing COS / H2S / CO) in the near-wall zone of the water-cooled wall is the main factor inducing sulfate / sulfide corrosion.

[0025] Therefore, the embodiments of this application can provide a real-time online detection device for the reducing atmosphere in the near-wall region of a boiler water-cooled wall to detect the high-temperature reducing atmosphere in the near-wall region of the water-cooled wall, and to prepare data for corrosion protection of the near-wall region of the boiler water-cooled wall.

[0026] Water-cooled walls here refer to boiler water-cooled walls. Boiler water-cooled walls are usually key heat-receiving components around the furnace of a boiler. They are generally made of seamless steel pipes and are mainly used to absorb the heat of the flames inside the boiler furnace, helping to protect the boiler furnace walls from high-temperature damage.

[0027] The near-wall region can be understood as a specific spatial range close to the boiler water-cooled wall. It is generally the area where the water-cooled wall is in direct contact with the flue gas and the reaction is most active. In this embodiment, the near-wall region can be, but is not limited to, the 0-10mm area of ​​the water-cooled wall facing the fire. Here, the fire-facing side refers to the side of the boiler water-cooled wall facing the flame in the boiler furnace. This side is directly exposed to high-temperature flame radiation, and the composition and temperature of the flue gas change most significantly on this side. Therefore, in this embodiment, flue gas sampling can be performed here to ensure that the sampled flue gas can truly reflect the true state of the flue gas in the near-wall region of the boiler water-cooled wall.

[0028] The high-temperature reducing atmosphere near the water-cooled wall is an overall environmental state composed of specific substances such as high-temperature reducing gases. In this application embodiment, the concentration of key reducing gases contained in the high-temperature reducing atmosphere near the water-cooled wall can be detected.

[0029] For ease of explanation, Figure 2 This is a schematic diagram of a real-time online detection device for reducing gases in the near-wall region of the water-cooled wall on the fire side of a boiler furnace, according to one embodiment of this application. It shows the position and arrangement of various modules and units. The following embodiments are all combined with... Figure 1 and Figure 2 Please provide an explanation.

[0030] In some embodiments, when this application detects reducing gases in the near-wall region of the boiler water-cooled wall in real time, it is necessary to collect an initial flue gas sample from the near-wall region of the water-cooled wall. The reducing gases detected in this application include, but are not limited to, key reducing gases such as carbonyl sulfide (COS), hydrogen sulfide (H2S), and carbon monoxide (CO) in the boiler flue gas, all of which are contained in the initial flue gas sample.

[0031] Furthermore, the initial flue gas samples collected in this application from the near-wall region of the water-cooled wall meet preset representative conditions. These preset representative conditions can be understood as pre-defined conditions that ensure the collected initial flue gas samples effectively represent the flue gas in the near-wall region of the boiler's water-cooled wall. For example, maintaining the temperature of the sampling tube of the initial flue gas sample within the same range as the flue gas temperature at the sampling port (typically 400℃-600℃) avoids condensation or pyrolysis distortion of reducing gases such as COS / H2S. It should be noted that the specific preset representative conditions can be set or adjusted by those skilled in the art according to actual conditions. The embodiments in this application are merely illustrative and do not constitute specific limitations.

[0032] This application embodiment can collect initial flue gas samples that meet certain representative conditions in the near-wall region of the boiler water-cooled wall. For example, the sampling tube and sampling port of the initial flue gas sample are kept at the same temperature to avoid distortion caused by condensation or pyrolysis of reducing gases, thus providing a reliable sample for the final accurate detection of reducing gases in the near-wall region of the boiler water-cooled wall.

[0033] Optionally, in one embodiment of this application, the flue gas sampling module 100 includes: at least one multi-layer composite sampling tube, wherein the multi-layer composite sampling tube includes, from the inside out, an inner lining layer, a gradient transition layer, an Inconel 625 base tube layer, a metal armored MI heat tracing layer, a SiO2 aerogel insulation layer and an Inconel 625 foil protective layer, and the preset representative conditions include that the sampling port is located in the 0~10mm region of the water-cooled wall on the fire side.

[0034] Based on the descriptions of other embodiments, it is understood that the initial flue gas sample in this application must meet certain representative conditions, including but not limited to maintaining the temperature range of the sampling tube and the flue gas temperature at the sampling port consistent.

[0035] In actual implementation, in order to keep the temperature of the sampling tube of the initial flue gas sample consistent with the temperature range of the flue gas at the sampling port, the sampling tube of the initial flue gas sample in this application may, but is not limited to, use a multi-layer composite sampling tube to jointly ensure the stability of the high-temperature flue gas and avoid the high-temperature flue gas from easily condensing or pyrolyzing during the transmission process, which would lead to gas concentration distortion and make the true concentration untraceable. In particular, COS is extremely unstable at room temperature and is very easy to undergo rapid hydrolysis or oxidative decomposition during the sampling process.

[0036] In the embodiments of this application, the sampling tube may be, but is not limited to, a multi-layer composite sampling tube. The multi-layer composite sampling tube includes, from the inside out: an inner lining layer, a gradient transition layer, an Inconel 625 base tube layer, a metal armored MI heat tracing layer, a SiO2 aerogel insulation layer, and an Inconel 625 foil protective layer, each of which is a pipe.

[0037] In this embodiment, the innermost liner of the multilayer composite sampling tube is made of reaction-bonded silicon carbide (RBSiC). The inner diameter Φ of the liner is 8-12mm, the tube wall thickness is 1.5-2.0mm, and the surface roughness Ra of the tube wall is ≤0.8μm, so as to effectively control the flue gas velocity in the sampling tube to ≤5m / s and prevent the corrosion and wear of the base tube layer by reducing gas and dust.

[0038] The outermost layer adjacent to the inner liner is a gradient transition layer. In this embodiment, the gradient transition layer is made of NiCrAlY + 40 vol% SiC, with a wall thickness of 0.2-0.5 mm. Here, NiCrAlY refers to a high-temperature protective alloy, composed of nickel (Ni), chromium (Cr), aluminum (Al), yttrium (Y), etc., capable of withstanding temperatures above 1000℃, exhibiting strong oxidation resistance while also forming good adhesion with the metal matrix. 40 vol% SiC here can be understood as the addition of 40% by volume of silicon carbide (SiC) particles to the NiCrAlY alloy (vol% here refers to volume percentage, not mass percentage). By adding SiC, this embodiment utilizes SiC's high hardness, high wear resistance, and high-temperature resistance to compensate for the insufficient hardness of NiCrAlY itself, allowing the gradient transition layer to simultaneously possess high-temperature resistance, oxidation resistance, wear resistance, and erosion resistance.

[0039] It should be noted that the gradient transition layer here can be understood as an intermediate coating with gradually changing composition. It can be used to connect the inner liner and the base tube layer with large differences in performance, so as to facilitate the cooperation between the inner liner and the base tube layer to effectively suppress the thermal stress of the multi-layer composite sampling tube.

[0040] The outermost layer adjacent to the gradient transition layer is the base pipe layer (Inconel 625 base pipe layer). In this embodiment, the base pipe layer may be, but is not limited to, using Inconel 625 alloy pipe, that is, pipe made of nickel-based superalloy Inconel 625. The pipe wall thickness may be, but is not limited to, 1.5-2.0 mm. It is mainly used to support the creep-resistant main skeleton of the flue gas sampling pipe, and to bear the structural support and basic load-bearing function of the flue gas sampling pipe. At the same time, it has good sulfur corrosion resistance.

[0041] The outermost layer adjacent to the base pipe layer is the heat tracing layer (metal-armored MI heat tracing layer). The main heating element of the heat tracing layer is a metal-armored MI cable (Mineral Insulated Cable). The pipe wall thickness is 5mm. The metal-armored MI cable can be used for active temperature compensation during the process of transporting flue gas from the sampling port to the testing equipment. For example, PID segmented temperature control can be used to keep the flue gas temperature constant, ensuring that the flue gas temperature in the pipe is always maintained between 400℃ and 600℃, and avoiding the condensation of gases such as COS and H2S due to temperature drop or pyrolysis due to local overheating.

[0042] Additionally, in the embodiments of this application, the metal-armored MI cable of the heat tracing layer may, but is not limited to, employ dual thermocouple redundancy: a pipe wall K-type thermocouple and a flue gas outlet thermocouple, and dynamically adjust the heat tracing cable power using a PID algorithm. The expression may, but is not limited to, be as follows:

[0043] in, This refers to the power of the heat tracing cable, measured in kW. =Set temperature - Actual measured temperature, control accuracy ±1℃; It is the proportional gain coefficient; It is the integral gain coefficient; It is the differential gain coefficient.

[0044] The insulation layer (SiO2 aerogel insulation layer) is a thermal insulation structure layer covering the outside of the heat tracing layer. In this embodiment, the insulation layer is made of silica (SiO2) aerogel felt, which is a flexible felt-like material made of silica (SiO2) aerogel. In this embodiment, the wall thickness of the insulation layer can be, but is not limited to, 15-25mm (SiO2 content > 99%, thermal conductivity < 0.02W / m·K). Silica aerogel felt has advantages such as ultra-thin and efficient insulation, high temperature resistance, and easy installation. It can prevent the heat inside the sampling tube (maintained by the heat tracing layer at 400℃-600℃) from dissipating to the external environment, avoid the temperature drop inside the tube due to excessive heat dissipation, keep the sampling tube at a constant temperature throughout, and ensure the authenticity of the flue gas sample.

[0045] The outermost layer adjacent to the insulation layer is a protective layer (Inconel 625 foil protective layer). In this embodiment, the protective layer is made of Inconel 625 foil. Inconel 625 foil refers to a thin sheet material rolled from Inconel 625 nickel-based alloy. It also possesses strong corrosion resistance and high temperature resistance, and due to its thinness, it has excellent high ductility and sealing properties. It can tightly wrap the curved parts of the sampling tube to form a seamless protective layer, preventing external media from seeping in through gaps and protecting all internal layers from external mechanical damage, corrosion, or dust intrusion. In this embodiment, the thickness of the protective layer can be, but is not limited to, 0.5-1.0 mm.

[0046] Furthermore, the preset representative conditions in this application embodiment include not only maintaining the temperature range of the sampling tube of the initial flue gas sample and the flue gas temperature at the sampling port consistent, but also requiring the sampling port position of the sampling tube to meet certain conditions, which can also be understood as the collection area of ​​the initial flue gas sample needing to meet certain conditions.

[0047] Specifically, the preset representative conditions in the embodiments of this application also include, but are not limited to, the sampling port of the initial flue gas sample being located in the 0-10mm area on the fire side of the water-cooled wall, so as to facilitate the precise positioning of the sampling port and ensure that the initial flue gas sample truly reflects the actual state of the active reaction area near the wall of the water-cooled wall, such as composition and temperature.

[0048] The embodiments of this application can combine multiple layers, including an inner lining layer, a gradient transition layer, an Inconel 625 base tube layer, a metal armored MI heat tracing layer, a SiO2 aerogel insulation layer, and an Inconel 625 foil protective layer, to form a composite sampling tube, which synergistically ensures the temperature and stability of the high-temperature flue gas sampling, i.e., the initial flue gas sample, in the near-wall area of ​​the boiler water-cooled wall.

[0049] The flue gas filtration module 200 is connected to the flue gas sampling module 100. The flue gas filtration module 200 is used to filter impurities in the initial flue gas sample and generate the flue gas sample to be tested.

[0050] In actual implementation, the initial flue gas sample collected directly from the near-wall area of ​​the boiler water-cooled wall may contain various impurities, and dust blockage and corrosive gases can easily damage optical components. Therefore, this application can filter the initial flue gas sample to remove impurities and generate a flue gas sample that can be used for subsequent flue gas analysis and detection.

[0051] For example, when initial flue gas sampling is performed in the 0-10mm region of the water-cooled wall facing the fire, the following issues may arise: Solid impurities, such as fly ash particles (inorganic mineral particles produced by incomplete combustion of fuels (such as coal and biomass)) directly related to high-temperature combustion and pipe wall reaction, carbon particles remaining from incomplete combustion of fuel (especially pulverized coal) on the fire side, and oxide scale that may form on the surface of the water-cooled wall or tiny detached particles from the pipe wall, etc., which enter the sample under the flushing of flue gas, etc. Gaseous interfering impurities, such as sulfur oxides generated by the combustion of sulfur elements in fuels like SO and SO3 at high temperatures on the fire side, and nitrogen oxides (NO) generated by the reaction of N2 and O2 in the air at high temperatures on the fire side, although these gases do not directly react with the reducing gases being detected, they occupy the partial pressure of the flue gas and may affect the range judgment of the detection instrument, as well as the presence of localized excess oxygen (O2) on the fire side due to uneven air distribution in the furnace. Liquid / condensed impurities, such as condensate formed from water vapor in the flue gas due to temperature changes or reactions, not only dilute the flue gas but may also dissolve gases such as H2S and SO2, leading to distortion of sample composition. Other impurities, such as sulfuric acid droplets formed by the combination of SO3 and water vapor, and nitric acid droplets formed by the reaction of NO2 and water, may generate sulfuric acid mist / nitric acid mist at high temperatures on the fire side. These exist in the form of aerosols and will adhere to the surface of the sampling tube or detection element after entering the sample, affecting the accuracy of detection.

[0052] This application embodiment can be equipped with a certain flue gas filtration module to filter out solid impurities, liquid interfering substances and gaseous interfering impurities that may exist in the initial flue gas sample. This prevents impurities from clogging the detection pipeline, contaminating the detection element or reacting with the target reducing gas (such as COS, H2S, CO). Finally, a pure and stable flue gas sample is generated, providing reliable data support for the real-time online detection of reducing gases in the near-wall area of ​​the boiler water-cooled wall, and ensuring that the detection results are true and reliable.

[0053] Optionally, in one embodiment of this application, the flue gas filtration module 200 includes: a dual-chamber housing, the cylindrical pressure-bearing structure of the housing having a built-in thermal expansion bellows to divide it into two independent semi-cylindrical chambers, and the two independent semi-cylindrical chambers sharing a top purified gas outlet; a metal fiber filter element, the metal fiber filter element including a gradient pore filter cartridge disposed in each chamber; and a backflushing cleaning unit, the backflushing cleaning unit including a Venturi nozzle disposed on the top of the metal fiber filter element for cleaning with nitrogen pulses.

[0054] In some embodiments, the flue gas filtration module 200 in this application includes, but is not limited to, a dual-chamber housing, a metal fiber filter element, and a backflushing cleaning unit.

[0055] Here, the dual-chamber shell refers to a cylindrical shell that is divided into two independent semi-cylindrical chambers by a built-in thermal expansion bellows in a cylindrical pressure-bearing structure, and the two independent semi-cylindrical chambers share the top purified gas outlet.

[0056] For example, the dual-chamber shell in this embodiment is a cylindrical shell made of nickel-based superalloy Inconel 625 with a thickness of 8-10mm. It can provide pressure protection and thermal expansion buffering. The cylindrical design and cylindrical pressure-bearing structure distribute the flue gas pressure more evenly, avoiding cracking due to the high pressure of the boiler flue gas, and providing stable pressure protection for the internal filter components. At the same time, the internally integrated bellows compensate for displacement. Through the built-in thermal expansion bellows, the thermal deformation caused by the thermal expansion of the shell and internal components due to the high flue gas temperature (400℃-600℃) can be absorbed by its own expansion and contraction, avoiding stress cracks in the shell due to thermal expansion and contraction, and preventing leakage of unfiltered flue gas due to chamber seal failure.

[0057] The dual-chamber shell features a dual-chamber semi-cylindrical structure. The entire cylindrical structure of the dual chambers is identical to the six-layer composite structure of the sampling tube, using an Inconel 625 matrix and an RBSiC (reactive sintered silicon carbide) liner. A partition separates the shell into two independent chambers, forming the dual-chamber semi-cylindrical structure. Each chamber independently houses a filter element, enabling separate coarse and fine filtration. This allows for the phased removal of impurities from the initial flue gas sample, improving filtration efficiency. The independent chamber design also prevents impurities from falling off one side and contaminating the filtered flue gas on the other, ensuring the purity of the sample. Furthermore, the chambers share a common gas collection chamber, meaning the purified gas from both chambers converges at the same top outlet. This reduces the retention of filtered flue gas within the chambers and prevents backflow mixing with unfiltered flue gas, ensuring rapid and stable output of the sample.

[0058] The upper part of the dual-chamber shell is the gas collection chamber, which is also made of nickel-based superalloy Inconel 625. The chamber wall thickness is 15-20mm. Since the dust in the flue gas has been removed from the dual-chamber shell, the gas collection chamber structure in this embodiment is similar to that of the sampling tube. It is a five-layer composite structure, which only lacks an inner lining layer compared to the sampling tube. The purified gas can be collected through a spiral flow guiding structure.

[0059] Furthermore, the filter elements in each chamber of the dual-chamber housing are metal fiber filter elements, and the metal fiber filter elements are connected to the chambers using quick-release high-temperature flanges. This allows for rapid installation and removal of the metal fiber filter elements via a dedicated snap-fit ​​or quick-locking structure. The filter element end integrates a highly corrosion-resistant nickel-based alloy Hastelloy C276 forged flange (outer diameter 220mm, sealing surface Ra (surface roughness) ≤0.8μm). The forging process enhances flange strength, preventing cracking under high temperature and pressure, and ensures a tight fit with the chamber end sealing surface, reducing leakage risk. The filter element includes an Ω-shaped bellows expansion joint (compensation ±3mm). Due to the high flue gas temperature, there may be a difference in thermal expansion between the filter element and the chamber. The bellows absorbs the ±3mm displacement deviation through its own expansion and contraction, preventing sealing failure or component damage due to thermal stress at the connection point, ensuring long-term sealing reliability. An Inconel is pre-embedded at the chamber end. The 625 flange seat has a built-in double sealing groove. The main seal is a flexible graphite metal spiral wound gasket, which combines the high-temperature sealing resistance of graphite with the strength of metal. It can adapt to high-temperature flue gas environments. The backup seal can be, but is not limited to, a ceramic fiber emergency gasket, so as to temporarily block flue gas leakage in the event of accidental failure of the main seal, avoid the accident from escalating, and improve system safety.

[0060] Furthermore, the metal fiber filter element in this embodiment is cylindrical, which maximizes the utilization of the chamber volume and allows the flue gas to flow evenly from the outside to the inside of the filter element (or vice versa), increasing the contact area between the flue gas and the filter element, improving filtration efficiency, and avoiding insufficient filtration due to excessively high local flow rates. The filter element base material (metal fiber) is Hastelloy C276 multi-layer gradient sintered fiber felt, ensuring the overall strength of the filter element and preventing deformation or damage due to flue gas scouring or pressure fluctuations. At the same time, the gradient pore size filter cartridge (5μm on the surface / 1μm on the inner layer) can capture impurities of different particle sizes in the flue gas, such as fly ash and carbon particles, from coarse to fine, achieving a dust and unburned coal powder particle capture efficiency of ≥99.98%.

[0061] The gradient pore size filter cartridge refers to a filter cartridge where the pore size gradually decreases from coarse to fine from the flue gas inlet side to the flue gas outlet side, rather than having uniform pores. Therefore, the inlet side (coarse pores) can first intercept larger particles in the flue gas, such as large fly ash particles and pipe wall debris, preventing large impurities from clogging the fine pores. Then, the outlet side (fine pores) precisely captures fine small-diameter dust particles, such as tiny carbon particles and aerosol particles, ensuring that the final output flue gas is almost free of solid impurities, achieving deep filtration. Furthermore, the gradient pore size filter cartridge is made of metal fiber, which can withstand high temperatures (flue gas temperatures of 400℃-600℃) and is corrosion-resistant (resistant to sulfur-containing flue gas erosion), preventing damage to the metal fiber filter element due to flue gas erosion or pressure fluctuations. Ultimately, the flue gas filtration module can achieve a dust collection efficiency of ≥99.98%, meeting the requirements for subsequent reducing gas detection of the flue gas sample and avoiding interference from impurities in the detection results.

[0062] The backflushing cleaning unit here refers to the Venturi nozzle installed on top of the metal fiber filter element, which can be cleaned by nitrogen pulses.

[0063] For example, the Venturi nozzle in the embodiments of this application may be, but is not limited to, a SiC ceramic Venturi nozzle, which is temperature resistant to >1600℃ and resistant to sulfur corrosion, thus avoiding cracking and wear of the nozzle due to high temperature or corrosion, and ensuring long-term spraying accuracy. During soot blowing, the 0.5MPa high-pressure nitrogen gas ejected from the SiC ceramic venturi nozzle is kept at a constant temperature of 600℃ via an electric heating pipeline. This ensures that the nitrogen gas has sufficient pressure to break down impurities adhering to the filter element surface. At the same time, the electric heating keeps the nitrogen gas temperature constant to match that of the flue gas, which can prevent condensation caused by the temperature difference when the low-temperature nitrogen gas comes into contact with the high-temperature filter element or flue gas, or cause damage to the filter element due to thermal expansion and contraction. The 0.5MPa, 600℃ nitrogen gas pulse (frequency 0.05-0.1Hz) passes through the nozzle throat (throat diameter 8±0.05mm), which can accelerate the nitrogen gas to a high speed of 340m / s, forming a strong airflow impact. This effectively removes dust, unburned coal powder and other impurities adsorbed on the filter element surface. The nitrogen gas is also directionally sprayed at a precise tilt angle of -0.5°, allowing the high-speed nitrogen gas flow to evenly cover the cylindrical surface of the filter element, cleaning from top to bottom without dead corners. This avoids local impurity residue that could cause local blockage of the filter element and ensures the overall filtration efficiency of the filter element.

[0064] This embodiment of the application can provide a stable and adaptable pressure-bearing space for flue gas filtration through a dual-chamber shell, realizing the separation of flue gas from coarse to fine. Combined with the corrosion-resistant, high-temperature-resistant, and highly efficient interception capabilities of the metal fiber filter element, it can deeply remove impurities from the flue gas. Finally, the ceramic venturi nozzle is used for cleaning to avoid filter element clogging. The three work together to ensure that it can work stably and continuously in the harsh environment of boiler flue gas, and can efficiently produce pure flue gas samples for testing, providing a strong guarantee for the accuracy and continuity of subsequent reducing gas detection.

[0065] Optionally, in one embodiment of this application, the flue gas filtration module 200 further includes: a constant temperature heat tracing unit for maintaining the flue gas temperature within a preset range; and a sealed ash removal unit for providing sealed ash removal.

[0066] In other embodiments, the flue gas filtration module of this application further includes a constant temperature heating unit and a sealed ash removal unit. The constant temperature heating unit is used to maintain the flue gas temperature within a preset range; the sealed ash removal unit is used to provide sealed ash removal. Here, the preset range refers to a pre-set temperature range. In this embodiment, the flue gas filtration module maintains the temperature consistently with the original sampling port flue gas temperature. Therefore, the preset range in this embodiment can be, but is not limited to, 400℃-600℃. It should be noted that the specific preset range can be set or adjusted by those skilled in the art according to actual needs. This embodiment is only illustrative and does not impose specific limitations.

[0067] Specifically, the constant temperature heating unit in this application embodiment can maintain the flue gas temperature by wrapping metal armored MI electric heating tape around the double chamber walls, ash hopper and gas collection chamber.

[0068] In other words, the constant temperature heating unit in this embodiment ensures that the temperature of the flue gas remains consistent with the flue gas temperature at the sampling port (400℃-600℃) throughout the entire process from entering the dual chamber to exiting the gas collection chamber, thus avoiding compositional distortion due to temperature changes.

[0069] The heat tracing area includes, but is not limited to, the walls of the double-chamber chamber, the ash hopper, and the gas collection chamber. The heat tracing element remains the metal-clad MI electric heat tracing cable, which is resistant to high temperatures and corrosion, can generate heat stably in the harsh environment around the boiler, and is highly safe, not failing due to high temperatures or flue gas corrosion. Furthermore, the temperature control logic of the metal-clad MI electric heat tracing cable in this constant temperature heat tracing unit is consistent with the PID algorithm used for power control of the heat tracing layer in the previous flue gas sampling module 100.

[0070] The sealed ash discharge unit includes a lower ash hopper in a dual-chamber structure, a piezoelectric vibrator, and a nitrogen-sealed rotary valve. This unit discharges impurities (dust, unburned coal powder) filtered by the metal fiber filter from the lower ash hopper in the dual-chamber structure while strictly preventing leakage and avoiding the entry of external air or the mixing of unfiltered flue gas with the purified flue gas. Furthermore, the ash hopper in this embodiment may, but is not limited to, adopt a 70° cone angle design (a large cone angle reduces ash accumulation). Combined with the piezoelectric vibrator at the bottom, it can break up clumps of ash. When impurities clump together in the ash hopper, the vibrator generates high-frequency vibrations to break up the clumps, ensuring that the impurities can slide down smoothly and preventing clogging of the ash hopper.

[0071] Finally, the nitrogen-sealed rotary valve at the bottom of the ash hopper can intermittently discharge impurities through the rotating valve core, while simultaneously introducing nitrogen to form a sealed air curtain, preventing external air from entering the ash hopper, avoiding air mixing with flue gas and affecting detection, and also preventing unfiltered flue gas from leaking from the ash discharge port, ensuring the sealing of the entire filtration system, and ultimately ensuring that the flue gas filtration module can achieve a leakage rate of <0.1%.

[0072] It should be noted that in the embodiments of this application, the sampling tube branches symmetrically at the end and enters the upper part of the ash hopper of the filter section.

[0073] This application embodiment can maintain stable flue gas temperature throughout the process by wrapping heat tracing tape around key parts of the dual-cavity shell, avoiding compositional distortion. Combined with the vibration breaking of agglomerates and the ash discharge of the sealed ash discharge unit, it can efficiently clean and filter impurities while ensuring no leakage of external air or unfiltered flue gas, ensuring reliable system sealing, and preventing dust and unburned coal powder particles in the flue gas from contaminating the analytical instruments and shortening the equipment life.

[0074] The component measurement module 300 is connected to the flue gas filtration module 200. The component measurement module 300 is used to analyze the concentration of at least one key reducing gas in the flue gas sample to be tested, and generate a high-temperature corrosion risk assessment report of the reducing gas in the near-wall area of ​​the boiler water-cooled wall based on the concentration of the at least one key reducing gas. The at least one key reducing gas includes at least one of carbonyl sulfide, hydrogen sulfide and carbon monoxide.

[0075] In some embodiments, after obtaining the filtered flue gas sample to be tested, this application can analyze and detect the flue gas sample to be tested.

[0076] In related technologies, the detection of high-temperature reducing atmosphere in the near-wall region of water-cooled walls often employs single-spectral or electrochemical sensors, which cannot simultaneously measure COS (especially in the mid-infrared band), H2S, and CO with high precision. Therefore, COS detection is often overlooked. However, under typical operating conditions of 600℃, the corrosion rate of COS on water-cooled wall metal can reach 5 to 10 times that of H2S (because the active sulfur atoms produced by its decomposition can more easily penetrate the metal oxide layer). Therefore, the reducing gas detected in the embodiments of this application includes COS.

[0077] For example, in this application embodiment, the component measurement module 300 can be used to analyze the concentration of at least one key reducing gas in the flue gas sample to be tested, and generate a high-temperature corrosion risk assessment report of the reducing gas in the near-wall region of the boiler water-cooled wall based on the concentration of the at least one key reducing gas, wherein the at least one key reducing gas includes at least one of carbonyl sulfide, hydrogen sulfide and carbon monoxide.

[0078] Furthermore, in order to simplify the analysis and measurement of the flue gas sample to be tested and reduce the transfer of contamination from the flue gas sample to be tested, the component measurement module 300 in this embodiment is connected to the flue gas filtration module 200, and the flue gas sample to be tested can be directly transferred to the component measurement module 300.

[0079] Additionally, after detecting the concentration of reducing gases in the near-wall region of the boiler water-cooled wall, the real-time online detection device for the reducing atmosphere in the near-wall region of the boiler water-cooled wall in this embodiment can also output a ternary spectrum of COS-H2S-CO concentration in real time as a high-temperature corrosion risk assessment report for the water-cooled wall, providing accurate data support for boiler corrosion prevention.

[0080] For example, this application can, but is not limited to, use COS as the core basis for judging corrosion risk. It can not only accurately capture the initial corrosion risk when the concentration is extremely low (e.g., ≤0.1ppm), but also provide timely warnings when the COS concentration exceeds 0.3ppm. Compared with the traditional method of only monitoring H2S, it can detect problems 2-3 hours earlier, thus gaining time for early prevention and control.

[0081] The component measurement module 300 in this embodiment can be directly connected to the flue gas filtration module 200 to accurately analyze the concentration of key reducing gases such as carbonyl sulfide, hydrogen sulfide, and carbon monoxide in the sample to be tested. It can also generate a high-temperature corrosion risk assessment report for the water-cooled wall, which not only provides data support for understanding the reducing gases in the near-wall area, but also provides early warning of corrosion risks, thus helping the boiler to operate safely.

[0082] Optionally, in one embodiment of this application, the component measurement module 300 includes: a laser system; a dual-channel Herriott cell; and a signal processing system.

[0083] In actual implementation, the component measurement module 300 in this application embodiment includes, but is not limited to, a laser system, a dual-channel Herriott cell, and a signal processing system. Figure 3 This is a schematic diagram of the structure of a component measurement module 300 according to an embodiment of this application, as shown below. Figure 3 As shown: (1) Laser system: The laser system in this application includes, but is not limited to, a laser, a laser controller, a modulation signal generator, and a combiner.

[0084] The lasers include, but are not limited to, two DFB lasers and one QCL laser. The DFB lasers (1578nm and 1567nm) are effective at targeting the near-infrared absorption peaks of H2S / CO; the QCL laser (4830nm) targets the strong mid-infrared absorption band of COS. Both emit narrow-linewidth (<0.01nm) lasers to precisely match the characteristic absorption wavelengths of the gas, and wavelength scanning is achieved through current tuning. This enables effective COS monitoring, overcoming the shortcomings of conventional sensors that cannot capture trace amounts of COS (actual concentrations often <50ppm) due to insufficient mid-infrared band coverage or low sensitivity.

[0085] The laser controller provides a low-noise constant current source to prevent laser intensity changes caused by current fluctuations, ensuring the stability of the detection signal is <0.01mA (i.e., the fluctuation range of the current provided by the laser controller to the laser will not exceed 0.01 mA). Simultaneously, the laser controller in this embodiment can integrate TEC temperature control (utilizing the temperature difference effect of a thermoelectric cooler to precisely control the temperature of the target component or device; in this embodiment, the temperature control accuracy is ±0.01℃), and receive modulation signals to drive the laser to perform high-frequency scanning (10kHz). This achieves precise control of the laser temperature, prevents wavelength drift caused by temperature changes, ensures that the laser wavelength always matches the gas absorption peak, rapidly completes wavelength scanning, and improves detection efficiency.

[0086] The modulation signal generator is mainly used to generate high-frequency triangular waves and sinusoidal modulation signals. The triangular wave is used to drive the laser to achieve a complete scan of the absorption spectrum, covering the gas absorption peak range and ensuring that the absorption signal can be captured. The sinusoidal wave is used in conjunction with wavelength modulation spectroscopy (WMS) technology to enhance the recognition of weak absorption signals, reduce background noise interference, and improve the detection sensitivity of low-concentration gases.

[0087] The multiplexer couples three laser beams (1578nm / 1567nm / 4830nm) to a single hollow fiber through a multi-channel fiber coupler, ensuring minimal laser energy loss and achieving optical loss of <10%. This ensures sufficient signal strength at the detection end without affecting detection accuracy, thereby enabling simultaneous detection of H2S, CO, and COS.

[0088] (2) Dual-channel Herriot pool: The dual-channel Herriott cell in this embodiment includes, but is not limited to, a flue gas channel and an optical channel. The combination of a flue gas channel (temperature control, long optical path) + an optical channel (anti-pollution, adjustable optical path) + a thermal isolation structure (heat insulation and leak prevention) allows the laser to fully react with the flue gas to capture weak absorption signals, while avoiding the influence of high temperature and corrosion of the flue gas on the optical components, providing a stable reaction space for the accurate detection of reducing gases such as H2S, COS, and CO.

[0089] The flue gas channel can, but is not limited to, adopt an axial through-hole design using an Inconel 625 straight pipe (100mm in diameter), with flange connections to the inlet / outlet. The flue gas within the channel maintains a low flow velocity, keeping it laminar (Reynolds number <2000) to avoid turbulence causing uneven gas distribution and ensuring uniform contact between the laser and the flue gas. Multiple laser reflections within the flue gas channel enhance absorption (reflection count >40), creating a long optical path (optical path >32m), allowing even low-concentration gases to fully absorb the laser and improving detection accuracy. The flue gas channel employs a four-layer composite structure (removing the inner lining and gradient transition layer from the six-layer composite structure of the sampling tube, as the flue gas has already been dust-removed and does not require wear-resistant treatment; the remaining four layers (Inconel 625 base pipe layer, metal-clad MI heat tracing layer, SiO2 aerogel insulation layer, and Inconel 625 foil protective layer and their internal / external arrangement) are consistent with the sampling tube). An external metal-clad MI maintains the flue gas temperature, preventing condensation or compositional changes. The power control of the heat tracing cable uses the same PID algorithm as the sampling module.

[0090] The optical channel can, but is not limited to, use a square tube with a cross-section of 60×160mm, and the cavity can, but is not limited to, be made of 304 stainless steel plated with gold. The incident / exit sapphire windows (two sapphire optical elements set at each end of the optical channel) respectively serve the functions of the laser entering and exiting the optical channel: the incident sapphire window, located at the laser entry end, is responsible for allowing the laser from the multiplexer (including multiple lasers for detecting H2S, CO, and COS) to enter the optical channel and begin its interaction with the flue gas; the exit sapphire window, located at the laser exit end, is responsible for allowing the laser, after multiple reflections and sufficient interaction with the flue gas, to exit and enter the subsequent detection elements to complete signal acquisition. Simultaneously, the optical channel is filled with 99.999% pure nitrogen gas, creating an inert environment. The optical path is transmitted within this inert gas environment, achieving physical isolation from the flue gas and preventing contamination or corrosion of the optical elements.

[0091] Furthermore, the optical path layout in the optical channel can, but is not limited to, employ a four-mirror reflection structure (four mirrors working together). All mirrors utilize a microcrystalline glass substrate with a gold-plated surface (Au), exhibiting a reflectivity >99.5%@1-5μm. This means the mirrors can reflect over 99.5% of the laser-emitted waves of H2S, CO, and COS in the 1-5μm wavelength range of the incident light, resulting in extremely low light energy loss. Further, the mirror lenses can, but are not limited to, be fixed using a metal-ceramic support. A graphite sealing gasket can be filled between the support and the cell to compensate for the thermal expansion difference between the support and the cell. Additionally, the terminal mirror in the four-mirror reflection structure (the last mirror the incident light passes through) can, but is not limited to, be mounted on a precision threaded micro-displacement platform (driven by a stepper motor, resolution ±0.01mm). By adjusting the mirror spacing (L), the number of reflections (N) can be changed, achieving continuous adjustment of the optical path (S=2N·L) within the range of 20-40 meters to accommodate the detection of different gas concentrations.

[0092] The optical channel in this embodiment also includes a thermal isolation structure, which can still be a sapphire window; a double-sided antireflective film with a thickness of 5 mm, a light transmission band of 0.15-5.5 μm, a light transmittance >95%, and resistance to high temperature of 650℃ and corrosion from sulfur-containing gases; and a metal bellows seal (leakage rate <10-9 Pa·m). 3 / s) and allows axial thermal expansion, mainly used to separate the flue gas channel and the optical channel to prevent flue gas leakage; the two sides of the window are provided with four composite heat insulation layers: the first layer is silicon carbide porous ceramic, the thickness can be but is not limited to 5mm; the second layer is nano ZrO2 aerogel, the thickness can be but is not limited to 8mm; the third layer is a vacuum radiation shielding layer, the thickness can be but is not limited to 2mm; the fourth layer is a microchannel nitrogen cooling plate, the thickness can be but is not limited to 10mm, which can achieve a thermal conductivity ≤0.03 W / (m·K) to control the temperature of the optical channel ≤100℃.

[0093] (3) Signal processing system: The signal processing system in this embodiment can, but is not limited to, capture H2S / CO near-infrared signals using an InGaAs detector (indium gallium arsenide photodetector, 900-1700nm) and simultaneously receive CO mid-infrared signals using an MCT detector (mercury cadmium telluride photodetector, 3-12μm). The optical signal resulting from the interaction of the laser and the gas is converted into an electrical signal (response time <1μs, signal-to-noise ratio >100dB). Both detectors integrate a thermoelectric cooler (TEC) to stabilize the temperature within the range of 25±2℃, preventing thermal deformation from affecting the optical path.

[0094] Furthermore, the signal processing system in this embodiment also includes a preamplifier. The preamplifier is designed with a low temperature drift (±0.1μV / ℃), meaning that for every 1 degree Celsius increase or decrease in temperature, the fluctuation range of the voltage signal output by the preamplifier will not exceed 0.1 microvolts (μV, 1μV=10). -6 V), thereby enabling low-noise amplification of the detector's weak electrical signal with a gain ≥60dB, thus suppressing cable capacitance interference.

[0095] In signal processing, the lock-in amplifier extracts the second harmonic (2f) signal amplified by the preamplifier, improving the signal-to-noise ratio by more than 100 times. Finally, the temperature-optical path coupling algorithm corrects the influence of temperature differences on gas absorption characteristics, outputting the true concentration data of the reducing gas. The expression can be, but is not limited to, the following:

[0096] in, This represents the actual concentration. For measuring concentration; Temperature inside the flue gas passage, in Kelvin (K). Temperature within the optical path channel, in Kelvin (K). The intensity of the spectral line at flue gas temperature, in cm. -1 / (molecule·cm -2 ); The intensity of the spectral line at the temperature within the optical path channel, in cm. -1 / (molecule·cm -2 ); The energy level for the transition to the next energy level is expressed in cm⁻¹. -1 ; is Planck's constant, with units of J·s; The speed of light is expressed in cm·s. -1 ; Boltzmann constant, in J·K -1 .

[0097] Through the above modules, the real-time online detection device for reducing atmosphere in the near-wall zone of the boiler water-cooled wall in this embodiment has an extremely fast response speed, capable of feeding back gas concentration changes in a very short time: the response time for detection with COS accuracy ≤ 0.1ppm is ≤ 50ms, and the response time for detection with H2S ≤ 2ppm and CO accuracy ≤ 5ppm is ≤ 100ms. It also supports real-time adjustment of boiler air distribution (e.g., adjusting the opening of secondary dampers) to control the concentration of harmful reducing gases within a safe range, preventing further corrosion. Finally, due to its multiple protections, the real-time online detection device for reducing atmosphere in the near-wall zone of the boiler water-cooled wall in this embodiment features long-term operation and high stability. After 8000 hours of continuous use, the deviation of the detection data remains very small, adapting to the boiler's need for long-term stable operation and rapidly changing operating conditions, continuously providing reliable corrosion prevention data.

[0098] The embodiments of this application can use a signal processing system to specifically capture optical signals corresponding to different gases and stably convert them into electrical signals. When amplifying weak signals, interference is minimized, effective signals are extracted and signal quality is improved. Finally, deviations are eliminated through correction, thereby outputting accurate data on the concentration of reducing gases in the near-wall region of the boiler water-cooled wall, providing a reliable basis for the high-temperature corrosion risk assessment of the boiler water-cooled wall.

[0099] Optionally, in one embodiment of this application, it further includes: an emission processing module for emitting the flue gas sample to be tested.

[0100] In some embodiments, after measuring the concentration data of reducing gas in the near-wall region of the boiler water-cooled wall, this application may also set up a certain emission treatment module to safely dispose of the residual flue gas, and discharge the residual flue gas in an environmentally friendly manner to avoid flue gas emission pollution.

[0101] In this embodiment, the emission treatment module includes, but is not limited to, a cooling unit, a power unit, and a purification unit.

[0102] The cooling unit mainly uses a shell-and-tube water-cooled heat exchanger to rapidly cool the flue gas from 600℃ to 60±5℃. The flue gas duct before the cooler (i.e., the shell-and-tube water-cooled heat exchanger) can be lined with SiO2 aerogel and Inconel 625 foil to insulate the flue gas and prevent it from cooling down before reaching the cooler, thus ensuring stable cooling efficiency.

[0103] The power unit can use a corrosion-resistant fan to ensure that the flow rate of flue gas in the entire system remains stable and will not affect the cooling, purification or subsequent detection effects due to sudden changes in flow rate.

[0104] The purification unit mainly treats the flue gas by using a 20% NaOH solution in the bubbling absorption tank. Microbubbles are used to allow the flue gas to come into full contact with the 20% NaOH solution, so that the SO2 (harmful component) in the flue gas can fully react with the NaOH. Ultimately, more than 99.9% of SO2 can be removed, ensuring that the SO2 concentration at the outlet is below 20mg / m³, which can meet the environmental protection emission requirements and avoid the direct emission of harmful gases and pollution of the environment.

[0105] Additionally, since the boiler generates vibration and high temperature during operation, the components in the real-time online detection device and method for reducing atmosphere in the near-wall region of the boiler water-cooled wall may expand, which may lead to flue gas leakage. Therefore, the embodiments of this application also incorporate multi-level collaborative design measures in the real-time online detection device for reducing atmosphere in the near-wall region of the boiler water-cooled wall to address this situation.

[0106] Specifically, in this embodiment of the application, a rigid silicon carbide support ring with a stiffness of 500 N / mm can be installed every 500 mm in the real-time online detection device for the reducing atmosphere in the near-wall area of ​​the boiler water-cooled wall to directly suppress the vibration amplitude; the metal fiber filter element cavity adopts a truss-type internal skeleton so that its own vibration frequency (85 Hz) can avoid the vibration frequency of the boiler (30-40 Hz) to prevent resonance with the boiler and damage to the components.

[0107] To address the issue of system components expanding and deforming due to high temperatures, this application embodiment employs an Ω-shaped bellows and flange disc spring assembly in the real-time online detection device for the reducing atmosphere near the boiler water-cooled wall to absorb thermal displacement and provide axial compensation, thus offsetting the axial expansion displacement of the components. Furthermore, a honeycomb wall panel (10mm pore size) is installed in the metal fiber filter element to disperse radial expansion stress and provide radial compensation. Finally, a SiO2 aerogel layer is used to block the outward diffusion of flue gas heat, preventing external components from being affected by high temperatures.

[0108] Finally, in the embodiment of this application, a nitrogen sealing valve and a combination of metal spiral wound gasket and spring accumulator are used in the real-time online detection device for the reducing atmosphere in the near-wall zone of the boiler water-cooled wall to prevent flue gas leakage. Even if the components are slightly deformed, the sealing effect can be guaranteed.

[0109] The embodiments of this application can ensure that the emission of residual flue gas meets environmental protection requirements by rapidly reducing the flue gas temperature through a cooling unit, maintaining stable system flow through a power unit, and efficiently removing harmful components from the flue gas through a purification unit. At the same time, the collaborative design of the real-time online detection device for the reducing atmosphere in the near-wall area of ​​the boiler water-cooled wall effectively solves the problems of vibration, thermal expansion and sealing, ensuring the long-term stable operation of the device and providing reliable support for subsequent flue gas detection and boiler safety.

[0110] The following describes the operation of the real-time online detection device for reducing atmosphere in the near-wall region of the boiler water-cooled wall according to a specific embodiment: 1. Flue gas sampling module 100 During installation, the sampling tube extends into the furnace and is fixed to the water-cooled wall detection hole via a flange. Before starting, the heating layer is powered on to make the flue gas temperature inside the sampling tube consistent with that at the sampling port, preventing the high-temperature flue gas from condensing or pyrolyzing. The heating layer maintains a constant flue gas temperature throughout the process. The flue gas flow rate is controlled at 1.5~2.0L / min and is adjusted by a corrosion-resistant fan.

[0111] 2. Flue gas filtration module 200 Flue gas enters the chamber, dust is captured by the filter element, and purified gas is output from the top. When the differential pressure sensor detects a resistance >3000Pa, it triggers backflushing cleaning: nitrogen pulse injection for 10s, and dust falls into the ash hopper; when the resistance <1500Pa, it stops; the vibrator starts intermittently, and the dust is discharged through the rotary valve.

[0112] Replace the filter element when the resistance is greater than 5000Pa; maintain a constant smoke temperature by providing continuous heating.

[0113] 3. Component Measurement Module 300 Before startup, check the N2 concentration in the optical channel; introduce nitrogen into the composite insulation layer microchannel cooling plate; and install the detector integrated semiconductor cooling chip. N2 flue gas enters the flue gas passage through the inlet and flows out through the outlet; the flue gas temperature is maintained constant throughout the process with heat tracing.

[0114] 4. Emission Treatment Module Start the fan; After cooling, the flue gas enters the absorption tank, where H2S and COS react with NaOH to generate Na2S, achieving a desulfurization efficiency >99.9%. The purified gas is discharged through the exhaust port, and the waste liquid is replaced regularly.

[0115] The real-time online detection device for reducing atmosphere in the near-wall zone of boiler water-cooled wall proposed in the embodiments of this application can monitor the concentration of key reducing gases such as carbonyl sulfide (COS), hydrogen sulfide (H2S), and carbon monoxide (CO) in the high-temperature reducing atmosphere in the near-wall zone of the water-cooled wall in real time, and generate a high-temperature corrosion risk assessment report of the reducing gases in the near-wall zone of the boiler water-cooled wall. This system enables precise location and extraction of representative flue gas samples from the near-wall area of ​​the water-cooled wall using a flue gas sampling module with high-temperature and corrosion-resistant sampling tubes. A flue gas filtration module efficiently removes dust and unburned coal particles from the flue gas, ensuring that subsequent precision analytical instruments are protected from contamination and wear, thus guaranteeing the accuracy of the test data. Finally, a component measurement module analyzes the concentrations of key reducing gases such as COS, H2S, and carbon monoxide (CO) in the filtered flue gas in real time online. Temperature control is maintained throughout the entire process from sampling to analysis to prevent chemical reactions of the tested flue gas components as the flue gas temperature decreases, effectively avoiding distortion of the reducing atmosphere concentration due to temperature fluctuations. This system achieves accurate real-time online measurement of key reducing gases in the high-temperature flue gas near the water-cooled wall of the furnace and provides COS concentration determination. This provides an important new basis for assessing and warning of high-temperature corrosion of the water-cooled wall, and provides crucial data support for timely implementation of targeted protective measures, thereby effectively mitigating and preventing high-temperature corrosion of the water-cooled wall and ensuring the long-term safe, stable, and environmentally friendly operation of the boiler. This addresses the problems in related technologies, such as the fact that many methods for detecting high-temperature reducing atmosphere in the near-wall region of water-cooled walls focus on the detection process and fail to effectively avoid the impact of flue gas temperature changes on the detection. Furthermore, many methods use single-spectral or electrochemical sensors for measurement, which can only detect the concentration of H2S / CO and assess the corrosion status accordingly. This significantly reduces the effectiveness and accuracy of the methods, making it impossible to truly reflect the corrosion status of the water-cooled wall and thus leading to the failure of protection strategies.

[0116] Next, referring to the accompanying drawings, a method for real-time online detection of reducing atmosphere in the near-wall region of a boiler water-cooled wall, according to an embodiment of this application, is described.

[0117] Figure 4 This is a flowchart of a real-time online detection method for the reducing atmosphere in the near-wall region of a boiler water-cooled wall, according to an embodiment of this application.

[0118] like Figure 4 As shown, the real-time online detection method for the reducing atmosphere in the near-wall region of the boiler water-cooled wall includes the following steps: In step S401, an initial flue gas sample is collected from the near-wall region of the water-cooled wall.

[0119] Step S402: Filter impurities from the initial flue gas sample to generate the flue gas sample to be tested.

[0120] Step S403: Based on at least one key reducing gas in the flue gas sample to be tested and the laser, generate an optical signal corresponding to at least one key reducing gas, convert the optical signal corresponding to at least one key reducing gas into an electrical signal corresponding to at least one key reducing gas, and calculate the concentration of at least one key reducing gas based on the electrical signal corresponding to at least one key reducing gas.

[0121] For example, this application can obtain an initial flue gas sample by sampling flue gas from the 0-10mm fire-facing region near the boiler water-cooled wall using a flue gas sampling module, and maintaining the flue gas temperature consistent with the sampling port temperature through a sampling tube. Then, this application can use a flue gas filtration module to filter impurities from the initial flue gas sample, obtaining a test flue gas sample suitable for component analysis, while maintaining the original flue gas temperature throughout the process. Finally, the test flue gas sample enters the component measurement module. At least one key reducing gas (COS and / or H2S and / or CO) in the test flue gas sample reacts with a laser emitted by a laser system, generating optical signals corresponding to different reducing gases. These optical signals are converted into corresponding electrical signals and analyzed to obtain the concentration data of the reducing gases. Additionally, based on this concentration data, a high-temperature corrosion risk assessment report of the reducing gases in the near-wall region of the boiler water-cooled wall can be generated, providing strong data support for water-cooled wall protection strategies.

[0122] It should be noted that the explanation of the aforementioned embodiment of the real-time online detection device and method for reducing atmosphere in the near-wall region of boiler water-cooled wall also applies to the real-time online detection method for reducing atmosphere in the near-wall region of boiler water-cooled wall in this embodiment, and will not be repeated here.

[0123] According to the real-time online detection method for reducing atmosphere in the near-wall region of boiler water-cooled wall proposed in the embodiments of this application, the concentration of key reducing gases such as carbonyl sulfide (COS), hydrogen sulfide (H2S), and carbon monoxide (CO) in the high-temperature reducing atmosphere in the near-wall region of the water-cooled wall can be monitored in real time, and a high-temperature corrosion risk assessment report of the reducing gases in the near-wall region of the boiler water-cooled wall can be generated. This system enables precise location and extraction of representative flue gas samples from the near-wall area of ​​the water-cooled wall using a flue gas sampling module with high-temperature and corrosion-resistant sampling tubes. A flue gas filtration module efficiently removes dust and unburned coal particles from the flue gas, ensuring that subsequent precision analytical instruments are protected from contamination and wear, thus guaranteeing the accuracy of the test data. Finally, a component measurement module analyzes the concentrations of key reducing gases such as COS, H2S, and carbon monoxide (CO) in the filtered flue gas in real time online. Temperature control is maintained throughout the entire process from sampling to analysis to prevent chemical reactions of the tested flue gas components as the flue gas temperature decreases, effectively avoiding distortion of the reducing atmosphere concentration due to temperature fluctuations. This system achieves accurate real-time online measurement of key reducing gases in the high-temperature flue gas near the water-cooled wall of the furnace and provides COS concentration determination. This provides an important new basis for assessing and warning of high-temperature corrosion of the water-cooled wall, and provides crucial data support for timely implementation of targeted protective measures, thereby effectively mitigating and preventing high-temperature corrosion of the water-cooled wall and ensuring the long-term safe, stable, and environmentally friendly operation of the boiler. This addresses the problems in related technologies, such as the fact that many methods for detecting high-temperature reducing atmosphere in the near-wall region of water-cooled walls focus on the detection process and fail to effectively avoid the impact of flue gas temperature changes on the detection. Furthermore, many methods use single-spectral or electrochemical sensors for measurement, which can only detect the concentration of H2S / CO and assess the corrosion status accordingly. This significantly reduces the effectiveness and accuracy of the methods, making it impossible to truly reflect the corrosion status of the water-cooled wall and thus leading to the failure of protection strategies.

[0124] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 501, the processor 502, and the computer program stored on the memory 501 and capable of running on the processor 502.

[0125] When the processor 502 executes the program, it implements the real-time online detection method for the reducing atmosphere in the near-wall region of the boiler water-cooled wall provided in the above embodiments.

[0126] Furthermore, electronic devices also include: Communication interface 503 is used for communication between memory 501 and processor 502.

[0127] The memory 501 is used to store computer programs that can run on the processor 502.

[0128] Memory 501 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0129] If the memory 501, processor 502, and communication interface 503 are implemented independently, then the communication interface 503, memory 501, and processor 502 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0130] Optionally, in a specific implementation, if the memory 501, processor 502, and communication interface 503 are integrated on a single chip, then the memory 501, processor 502, and communication interface 503 can communicate with each other through an internal interface.

[0131] Processor 502 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0132] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for real-time online detection of reducing atmosphere in the near-wall region of a boiler water-cooled wall.

[0133] This application also provides a computer program product, including a computer program that can run computer instructions. When the computer instructions are executed by a processor, they implement the real-time online detection method for reducing atmosphere in the near-wall region of the boiler water-cooled wall provided in this application.

[0134] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0135] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0136] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0137] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0138] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0139] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.

[0140] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0141] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A real-time online detection device for the reducing atmosphere in the near-wall region of a boiler water-cooled wall, characterized in that, include: The flue gas sampling module is used to collect initial flue gas samples from the near-wall region of the water-cooled wall that meet the preset representative conditions. A flue gas filtration module is connected to the flue gas sampling module. The flue gas filtration module is used to filter impurities in the initial flue gas sample to generate a flue gas sample to be tested. The component measurement module is connected to the flue gas filtration module. The component measurement module is used to analyze the concentration of at least one key reducing gas in the flue gas sample to be tested, and generate a high-temperature corrosion risk assessment report of the reducing gas in the near-wall area of ​​the boiler water-cooled wall based on the concentration of the at least one key reducing gas. The at least one key reducing gas includes at least one of carbonyl sulfide, hydrogen sulfide and carbon monoxide.

2. The apparatus according to claim 1, characterized in that, Also includes: An emission processing module is used to discharge the flue gas sample to be tested.

3. The apparatus according to claim 1, characterized in that, The flue gas sampling module includes: At least one multi-layer composite sampling tube, wherein the multi-layer composite sampling tube comprises, from the inside out, an inner liner, a gradient transition layer, an Inconel 625 base tube layer, a metal-clad MI heat tracing layer, a SiO2 aerogel insulation layer, and an Inconel 625 foil protective layer, and the preset representative conditions include the sampling port being located in the 0~10mm region of the water-cooled wall on the fire side.

4. The apparatus according to claim 1, characterized in that, The flue gas filtration module includes: The shell has a dual-chamber structure with a built-in thermal expansion bellows to divide it into two independent semi-cylindrical chambers, and the two independent semi-cylindrical chambers share a top purified gas outlet. A metal fiber filter element, the metal fiber filter element comprising a gradient pore filter cartridge disposed in each chamber; A back-flushing cleaning unit, comprising a Venturi nozzle disposed on top of the metal fiber filter element for cleaning with nitrogen pulses.

5. The apparatus according to claim 4, characterized in that, The flue gas filtration module also includes: The constant temperature heat tracing unit is used to maintain the flue gas temperature within a preset range; A sealed ash discharge unit is used to provide sealed ash discharge.

6. The apparatus according to claim 1, characterized in that, The component measurement module includes: Laser system; Dual-channel Herriott pool; Signal processing system.

7. A method for real-time online detection of reducing atmosphere in the near-wall region of a boiler water-cooled wall, characterized in that, The method employs a real-time online detection device for the reducing atmosphere in the near-wall region of the boiler water-cooled wall as described in any one of claims 1-6, wherein the method includes the following steps: Collect initial flue gas samples from the near-wall region of the water-cooled wall; Impurities in the initial flue gas sample are filtered out to generate a flue gas sample to be tested. Based on at least one key reducing gas in the flue gas sample to be tested and a laser, an optical signal corresponding to the at least one key reducing gas is generated, and the optical signal corresponding to the at least one key reducing gas is converted into an electrical signal corresponding to the at least one key reducing gas, so as to calculate the concentration of the at least one key reducing gas according to the electrical signal corresponding to the at least one key reducing gas.

8. An electronic device, characterized in that, include: The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the real-time online detection method for the reducing atmosphere in the near-wall zone of the boiler water-cooled wall as described in claim 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the real-time online detection method for the reducing atmosphere in the near-wall region of the boiler water-cooled wall as described in claim 7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed, it is used to implement the real-time online detection method for the reducing atmosphere in the near-wall region of the boiler water-cooled wall as described in claim 7.

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