Industrial flue gas continuous detection equipment based on self-checking

Abstract

The present invention relates to the technical field of flue gas collection and monitoring, and particularly to an industrial flue gas continuous detection device based on self-checking. The present invention is provided with a smoke collection box, an induction analysis module, a response module and a calibration module. The flue gas in the chimney is introduced into the flue gas probe through the air inlet channel. The spiral air pushing rod rotates to make the flue gas enter the flue gas probe. The induction analysis module screens the gas-solid gradual separation characteristic interval according to the change of flue gas temperature at different height points. The response module determines whether the spiral air pushing rod performs response adjustment and determines the adjustment method. The calibration module calibrates the adjustment method of the spiral air pushing rod. Furthermore, according to the difference in flue gas characteristics at different height points in the chimney, the response adjustment and calibration optimization of the detection device are realized to reduce the probability of blockage and improve the stability of continuous detection of the device.

Description

Technical Field

[0001] The invention relates to the technical field of smoke collection and monitoring, and in particular to industrial smoke continuity detection equipment based on autonomous verification. Background Art

[0002] In the industrial production process, industrial flue gas emission monitoring is extremely important. Industrial flue gas continuity detection equipment has become a key equipment to ensure environmental compliance and production process optimization. Traditional industrial flue gas continuity detection equipment faces many challenges. Due to differences in various factors such as the degree of fuel combustion in industrial production and the amount of flue gas generated, the position of the large-scale separation of gas and solid phases in the flue gas in the chimney will fluctuate. In the gas-solid two-phase flow environment, the gas and solid phases in the chimney produce violent turbulence and mixing under the action of the airflow, resulting in uneven and unstable flue gas temperature distribution, which brings great difficulties to the accurate detection of flue gas components and parameters. SO2, Gaseous pollutants such as sulfur dioxide and sulfur dioxide are easily lost due to temperature changes during transmission, and the heating effect will be significantly affected by the complex flow of gas and solid phases. In addition, the existing equipment lacks an autonomous calibration mechanism. During long-term operation, the operating status of the detection equipment is difficult to monitor and calibrate in real time, and it is impossible to ensure that the equipment is always in the best working condition. It is difficult to meet the needs of industrial production for high-precision and high-reliability flue gas detection. Therefore, the development of an industrial flue gas detection equipment that can be calibrated autonomously is of great practical significance.

[0003] For example, China Patent Publication No.: CN111912942A, the invention discloses an online monitoring system and monitoring method for furnace combustion flue gas, belonging to the field of flue gas monitoring, the system includes a sampling unit, a processing unit, a vacuum pump, an analysis unit, an analysis flow controller, a positive pressure gauge after the pump, a venting flow controller and an electronic control device. The vacuum pump is connected to the analysis unit through a pipeline. The positive pressure gauge after the pump is installed behind the air outlet of the vacuum pump, the analysis flow controller is installed on the pipeline at the air inlet of the analysis unit, and the air inlet of the venting flow controller is connected to the pipeline between the vacuum pump and the analysis unit. The electronic control device is electrically connected to the vacuum pump, the analysis flow controller, the positive pressure gauge after the pump and the venting flow controller respectively.

[0004] The prior art still has the following problems:

[0005] The existing technology does not take into account the separation of gas and solid phases in the chimney, which causes large particles to settle due to inertia, while fine particles move with the gas phase. The complex distribution of particles at the probe location leads to frequent blockage of the sampling branch pipe and the probe filter element. The existing technology cannot adjust the response of the detection equipment and optimize the calibration to reduce the probability of blockage according to the differences in flue gas characteristics at different heights in the chimney, thereby affecting the continuity of the detection stability of the equipment. Summary of the invention

[0006] To this end, the present invention provides an industrial flue gas continuous detection device based on autonomous verification to overcome the problems in the prior art that it cannot respond to the differences in flue gas characteristics at different height points in the chimney and cannot perform response adjustment and verification optimization on the detection device to reduce the probability of blockage.

[0007] To achieve the above object, the present invention provides an industrial flue gas continuous detection device based on autonomous verification, including:

[0008] A smoke sampling box, which is installed on the outer wall of the chimney and includes an air inlet channel and a flue gas probe to introduce the flue gas in the chimney into the flue gas probe through the air inlet channel. A spiral air pushing rod is arranged in the air inlet channel to make the flue gas enter the flue gas probe by rotation.

[0009] An induction and analysis module, which includes a plurality of temperature sensors arranged along the height direction on the inner wall of the chimney to obtain the flue gas temperature at different height points and a screening unit to screen the gas-solid separation characteristic interval section according to the change of the flue gas temperature at different height points.

[0010] A response module, which is respectively connected to the smoke sampling box and the induction and analysis module to determine whether to perform response adjustment on the spiral air pushing rod and determine the adjustment method according to the position distribution of the gas-solid separation characteristic interval section.

[0011] Among them, the adjustment method includes periodically changing the rotation direction of the spiral air pushing rod and setting a rotation pause period.

[0012] A verification module, which is respectively connected to the response module and the smoke sampling box to obtain the operating electrical signals of the spiral air pushing rod at consecutive marked times in sequence and verify the adjustment method of the spiral air pushing rod based on the signal intensity of the operating electrical signals.

[0013] Further, the spiral air pushing rod includes a spiral blade and a rotating rod that drives the spiral blade to rotate, and the spiral blade is attached to the inner wall of the air inlet channel.

[0014] Further, the screening unit is used to determine the change of the flue gas temperature at different height points. Among them,

[0015] The screening unit is used to calculate the difference in flue gas temperature between adjacent height points in the height dimension, construct a temperature difference fluctuation curve of the change of the flue gas temperature difference over time, and determine the temperature difference and slope corresponding to several data points on the temperature difference fluctuation curve.

[0016] Further, the screening unit is used to screen the gas-solid separation characteristic interval section. Among them,

[0017] The screening unit is used to calculate the Pearson coefficient, after removing the dimension of the slope, of the temperature differences corresponding to several data points in chronological order on the temperature difference fluctuation curve, screen out the temperature difference fluctuation curves for which the Pearson coefficient meets the coefficient screening conditions, and determine the gas-solid gradual separation characteristic interval segment according to the adjacent height points corresponding to the temperature difference fluctuation curve;

[0018] The coefficient screening condition is that the Pearson coefficient exceeds a preset coefficient threshold.

[0019] Further, the response module is used to determine the response adjustment of the spiral gas pushing rod and the adjustment method based on the determination result of the smoke sampling box within the gas-solid gradual separation characteristic interval segment.

[0020] Further, the adjustment method includes that the response module controls the spiral gas pushing rod to rotate in a first rotation direction for several operation cycles and rotate in a second rotation direction within a single operation cycle;

[0021] Wherein, at least one operation cycle of rotation pause period is set when switching from rotating in the first rotation direction to rotating in the second rotation direction.

[0022] Further, the first rotation direction is the direction in which the spiral gas pushing rod makes the flue gas enter the flue gas probe, and the second rotation direction is opposite to the rotation direction of the first rotation direction.

[0023] Further, the calibration module is also used to determine the marking time, wherein,

[0024] The calibration module is used to determine a single operation cycle in which the spiral gas pushing rod rotates in the second rotation direction, mark several moments at preset time intervals within the single operation cycle, and determine the marked moments as the marking time.

[0025] Further, the calibration module is used to obtain the operating electrical signals of the spiral gas pushing rod at several marked moments within a single operation cycle, and calculate the average signal intensity of the operating electrical signals corresponding to the several marked moments.

[0026] Further, the calibration module is used to calibrate the adjustment method of the spiral gas pushing rod according to the comparison between the average signal intensity and a preset signal intensity reference value, wherein,

[0027] If the average signal intensity exceeds the preset signal intensity reference value, the calibration module controls the spiral gas pushing rod to extend the operation duration of rotating in the second rotation direction, and the operation duration is positively correlated with the average signal intensity.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows. The present invention is provided with a smoke sampling box, an induction analysis module, a response module and a calibration module. The flue gas in the chimney is introduced into the flue gas probe through the air intake channel. The spiral air pushing rod rotates to make the flue gas enter the flue gas probe. The induction analysis module screens the gas-solid gradual separation characteristic interval according to the change of flue gas temperature at different height points. The response module determines whether the spiral air pushing rod performs response adjustment and determines the adjustment method. The calibration module calibrates the adjustment method of the spiral air pushing rod. Furthermore, according to the difference in flue gas characteristics at different height points in the chimney, the detection equipment is adjusted in response and calibrated and optimized to reduce the probability of blockage and improve the continuous detection stability of the equipment.

[0029] Furthermore, the present invention accurately determines the specific position of gas-solid two-phase separation in the chimney that is difficult to accurately grasp by analyzing the temperature difference and slope of flue gas at adjacent height points and combining Pearson coefficient screening. When the temperature difference of flue gas at adjacent height points in the height dimension is smaller and the negative value of the slope is larger, it means that there are special changes in the heat exchange and flow characteristics of the gas-solid two-phase in this interval. By accurately identifying the area with special phenomena, the pertinence of equipment adjustment is improved.

[0030] Furthermore, the present invention controls the spiral air pushing rod to rotate in the first rotation direction in several operating cycles through the response module, so that the flue gas can normally enter the flue gas probe to ensure sampling. And in a single operating cycle, it rotates in the second rotation direction, which can generate a reverse thrust to push the large particles that may accumulate in the probe inlet and sampling branch pipeline in the reverse direction, avoiding continuous accumulation of particles and causing blockage. At least one rotation pause period of the operating cycle is set to allow the air flow and particles to have a short static state. During the pause period, the particles originally attached to the pipe wall or filter element may fall due to factors such as gravity, and then rotate in the reverse direction, which is more conducive to cleaning these residual particles and further reducing the risk of blockage. Furthermore, according to the difference in flue gas characteristics at different height points in the chimney, the detection equipment is adjusted in response and calibrated and optimized to reduce the probability of blockage and improve the continuous detection stability of the equipment.

[0031] Furthermore, the present invention takes a single operating cycle in which the spiral air pushing rod rotates in the second rotation direction as the research object, marks several moments at preset time intervals as marking moments therein, and can understand the operating state of the spiral air pushing rod in the process of cleaning large particles in real time and accurately by obtaining the operating electrical signals at these marking moments. By calculating the average signal intensity of the operating electrical signals corresponding to the marking moments, the operating state of the equipment can be further quantified, and the degree of additional resistance received by the spiral air pushing rod during operation can be quantified. Furthermore, the subtle abnormalities in equipment operation can be captured more timely and accurately.

[0032] Further, when the average signal strength exceeds a preset reference value, it indicates that the spiral air pushing rod encounters a large resistance during operation. The reason is that a large number of large particles accumulate at the sampling branch pipeline or the probe filter element, resulting in an increase in the operating load of the equipment. The calibration module controls the spiral air pushing rod to extend the operating duration of rotation in the second rotation direction, which can clean the blocked part more fully, timely clean the accumulated particles, and avoid equipment failures caused by further aggravation of the blockage. Furthermore, according to the differences in the flue gas characteristics at different height points in the chimney, the detection equipment is adjusted in response and calibrated and optimized to reduce the probability of blockage and improve the stability of continuous detection of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of the smoke sampling box according to an embodiment of the present invention;

[0034] Figure 2 is a block diagram of the industrial flue gas continuous detection equipment based on self-calibration according to an embodiment of the present invention;

[0035] Figure 3 is a logic flowchart for the response module to determine whether to adjust the spiral air pushing rod;

[0036] Figure 4 is a logic flowchart for the calibration module to perform calibration;

[0037] In the figure, 1 - intake channel, 2 - flue gas probe, 3 - spiral air pushing rod, 31 - spiral blade, 32 - rotating rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0040] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0041] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Please refer to Figure 1 and Figure 2 as shown in Figure 1 which is a structural schematic diagram of the smoke sampling box of the embodiment of the present invention, Figure 2 and which is a device block diagram of the industrial flue gas continuous detection device based on self-check of the embodiment of the present invention. The industrial flue gas continuous detection device based on self-check of the present invention includes:

[0043] A smoke sampling box, which is installed on the outer wall of the chimney and includes an air inlet channel 1 and a flue gas probe 2 to introduce the flue gas in the chimney into the flue gas probe 2 through the air inlet channel 1. A spiral air pushing rod 3 is arranged in the air inlet channel to make the flue gas enter the flue gas probe 2 by rotation;

[0044] Specifically, the present invention does not limit the specific structure of the flue gas probe. Its internal includes components such as a ceramic filter element for filtering dust in the flue gas. The flue gas probe is widely used in the field of flue gas detection and will not be elaborated here.

[0045] An induction and analysis module, which includes a number of temperature sensors arranged along the height direction on the inner wall of the chimney to obtain the flue gas temperatures at different height points and a screening unit for screening the gas-solid separation characteristic interval section according to the change of the flue gas temperatures at different height points;

[0046] Specifically, the present invention does not limit the interval distance of the temperature sensors arranged along the height direction. In order to ensure that the temperature sensors have the utilization value of sectional comparison for the monitoring of the flue gas temperature in the chimney, it should be avoided that the interval distance is too large resulting in too large a temperature comparison difference, and it should also be avoided that the interval distance is too small resulting in unclear temperature differentiation. The value range of the interval distance of the temperature sensors arranged along the height direction can be [2, 5], and the interval unit is m. Preferably, the interval distance of the temperature sensors arranged along the height direction can be 3m.

[0047] Specifically, the present invention does not limit the specific structure of the temperature sensors. It can be an infrared temperature monitoring sensor, which is the prior art and will not be elaborated here.

[0048] A response module, which is respectively connected to the smoke collection box and the induction analysis module, is used to determine whether to adjust the response of the spiral air pushing rod 3 and the adjustment method according to the position distribution of the gas-solid separation characteristic interval;

[0049] Among them, the adjustment method includes periodically changing the rotation direction of the spiral air pushing rod 3 and setting a rotation pause period;

[0050] Specifically, the response module in the present invention can be composed of a microprocessor, a data storage module and a communication interface. The microprocessor is responsible for processing and calculating various data; the data storage module records historical data and preset parameters; the communication interface ensures stable data interaction with the smoke collection box and the induction analysis module, which will not be elaborated here.

[0051] A calibration module, which is respectively connected to the response module and the smoke collection box, is used to obtain the operating electrical signals of the spiral air pushing rod 3 at consecutive marked moments in time sequence, and calibrate the adjustment method of the spiral air pushing rod 3 based on the signal intensity of the operating electrical signals.

[0052] Specifically, the operating electrical signal in the present invention can be a current signal or a voltage signal. Preferably, a signal type of the operating electrical signal is provided here. Exemplarily, the operating electrical signal can be a current signal.

[0053] Specifically, the present invention does not limit the specific structure of the calibration module. It includes high-sensitivity current and voltage sensors, which can capture the current and voltage signals during the operation of the motor in real time, convert them into electrical signal data for analysis, a signal processor responsible for transmitting the electrical signal data, and the signal processor, which will not be elaborated here.

[0054] Specifically, please continue to refer to Figure 1 As shown, the spiral air pushing rod 3 includes a spiral blade 31 and a rotating rod 32 that drives the spiral blade 31 to rotate. The spiral blade 31 is attached to the inner wall of the air inlet channel 1.

[0055] In implementation, the rotating rod 32 that drives the spiral blade 31 to rotate is connected to a motor, and the motor is connected to the rotating rod 32 through a coupling to drive the rotating rod 32 to rotate. This is the prior art and will not be elaborated here.

[0056] Specifically, the screening unit is used to determine the change in the flue gas temperature at different height points, where

[0057] The screening unit is used to calculate the difference in the flue gas temperature between adjacent height points in the height dimension, construct a temperature difference fluctuation curve of the change in the flue gas temperature difference over time, and determine the temperature difference and slope corresponding to several data points on the temperature difference fluctuation curve.

[0058] Specifically, in the present invention, the screening unit can use the numerical differentiation method to determine the slopes corresponding to several data points on the temperature difference fluctuation curve. The numerical differentiation method approximates the derivative through finite differences to obtain the slope of the curve. This method is widely used in the calculation of the slope of curves and will not be elaborated here.

[0059] Specifically, the screening unit is used to screen the gas-solid gradual separation characteristic interval segment, where

[0060] the screening unit is used to calculate the Pearson coefficient of the temperature differences corresponding to several data points in time sequence on the temperature difference fluctuation curve and the slope after removing the dimension, screen out the temperature difference fluctuation curves that meet the coefficient screening conditions, and determine the gas-solid gradual separation characteristic interval segment according to the adjacent height points corresponding to the temperature difference fluctuation curve;

[0061] The coefficient screening condition is that the Pearson coefficient exceeds a preset coefficient threshold.

[0062] Exemplarily, the calculation process of the Pearson coefficient in the present invention can be as follows: The temperature differences at 5 moments in time sequence on the temperature difference fluctuation curve are obtained in advance as 1.8°C, 1.7°C, 1.5°C, 1.4°C, and 1.1°C respectively. The slopes corresponding to the data points at these 5 moments are -0.13, -0.17, -0.23, -0.26, and -0.34 respectively. By calculating the average value of the temperature differences at 5 moments and the average value of the slopes, the Pearson coefficient of the temperature differences corresponding to 5 moments in time sequence on the temperature difference fluctuation curve and the slope after removing the dimension can be calculated using the calculation formula of the Pearson coefficient. The calculation formula of the Pearson coefficient is prior art and will not be elaborated here.

[0063] In implementation, the preset coefficient threshold can be obtained according to historical experimental data. Calculate in advance the Pearson coefficient of the temperature differences corresponding to several moments in each interval segment of the chimney under the same working conditions after removing the dimension, calculate the average value of the Pearson coefficients of several interval segments, and determine the obtained average value of the Pearson coefficients as the preset coefficient threshold. Preferably, a value of the coefficient threshold is provided here, and the preset coefficient threshold is 0.9.

[0064] Those skilled in the art can understand that in the separation section of the gas-solid two-phase in the chimney, large particles will settle due to inertia, and fine particles will move with the gas phase. This separation process will affect the flue gas heat exchange at different heights, and then lead to changes in the flue gas temperature distribution. When the gas-solid separation phenomenon occurs, the difference in particle distribution at different height points causes changes in the heat transfer process, making the temperature difference between adjacent height points of the flue gas gradually decrease. At the same time, the change trend of this temperature difference will be manifested as an increasing negative value of the slope (i.e., the smaller the slope) on the temperature difference fluctuation curve. In the gas-solid separation region, due to the strong linear relationship between the temperature difference and the slope, their Pearson coefficient will show a specific numerical range. Therefore, the separation section of the gas-solid two-phase can be accurately screened out.

[0065] Specifically, the present invention accurately determines the specific position of the gas-solid two-phase separation in the chimney that is difficult to accurately grasp by analyzing the flue gas temperature difference and slope between adjacent height points and combining with the Pearson coefficient screening. When the flue gas temperature difference between adjacent height points in the height dimension is smaller and the negative value of the slope is larger, it means that there are special changes in the heat exchange and flow characteristics of the gas-solid two-phase in this section. By accurately identifying the area with special phenomena, the pertinence of equipment adjustment is improved.

[0066] Specifically, please refer to Figure 3 As shown, it is a logic flow chart for the response module of the embodiment of the present invention to determine whether to perform response adjustment on the spiral gas pushing rod. The response module is used to determine whether to perform response adjustment on the spiral gas pushing rod and determine the adjustment method based on the determination result of the sampling box in the gas-solid separation characteristic section;

[0067] Based on the determination result that the sampling box is not in the gas-solid separation characteristic section, the response module does not perform response adjustment on the spiral gas pushing rod;

[0068] In implementation, the spiral gas pushing rod uniformly introduces the flue gas in the chimney into the flue gas probe 2 at a preset rotation speed under normal working conditions, realizes continuous sampling of the flue gas, and transports the sampled gas through the sampling pipeline to the flue gas analyzer to calculate the content concentration values of sulfur dioxide, nitrogen oxides, etc. If the sampling box is not in the gas-solid separation characteristic section, the spiral gas pushing rod maintains the preset rotation speed without changing the rotation speed and without setting a rotation pause period. The rotation speed of the spiral gas pushing rod under normal working conditions is 60 revolutions per minute - 90 revolutions per minute.

[0069] Specifically, the adjustment method includes that the response module controls the spiral gas pushing rod to rotate in a first rotation direction in several operation cycles and rotate in a second rotation direction in a single operation cycle;

[0070] Wherein, at least one rotation pause period of the operation cycle is set during the rotation switching from the first rotation direction to the second rotation direction.

[0071] In implementation, the number of operation cycles of the spiral air pushing rod rotating in the first rotation direction can be set by those skilled in the art according to the monitoring requirements. Too many operation cycles of the spiral air pushing rod rotating in the first rotation direction may cause large-particle dust to enter the intake passage 1 and block the intake passage 1, affecting the continuity and accuracy of flue gas detection. Too few operation cycles of the spiral air pushing rod rotating in the first rotation direction may result in the failure to meet the timeliness of flue gas detection. The value range of the number of operation cycles of the spiral air pushing rod rotating in the first rotation direction can be set to [3, 5]. Preferably, the number of operation cycles of the spiral air pushing rod rotating in the first rotation direction is set to 5.

[0072] Specifically, if the cycle duration of one operation cycle in the present invention is too long, it will cause a large amount of dust to accumulate and enter the flue gas probe 2. The value range of the cycle duration of one operation cycle can be [5, 20], and the interval unit is min. Preferably, the cycle duration of one operation cycle is set to 8 min.

[0073] Specifically, the first rotation direction is the direction in which the spiral air pushing rod makes the flue gas enter the flue gas probe 2, and the second rotation direction is opposite to the rotation direction of the first rotation direction.

[0074] It can be understood that in the gas-solid two-phase flow in the chimney, there is a phenomenon that large particles settle due to inertia and fine particles move with the gas phase in the gas-solid separation characteristic interval section. This will make the particle distribution at the position of the probe complex and easily cause blockage of the sampling branch pipeline and the probe filter element. If the sampling box is in the gas-solid separation characteristic interval section, it means there is a high risk of blockage. At this time, it is necessary to make a response adjustment to the spiral air pushing rod to ensure the normal progress of flue gas sampling. Under normal circumstances, the spiral air pushing rod rotates in the first rotation direction, and using the pushing action of the spiral blade 31, a directional air flow is formed in the intake passage 1 to stably introduce the flue gas in the chimney into the flue gas probe 2, thereby realizing the collection of flue gas. When the spiral air pushing rod rotates in the second rotation direction, a reverse thrust will be generated. In the gas-solid separation characteristic interval section, due to the complex particle distribution, large particles may accumulate in the intake passage 1. Reverse rotation can push out these accumulated large particles in the reverse direction to prevent further accumulation and blockage, playing a role in cleaning and dredging.

[0075] Specifically, in the present invention, the response module controls the spiral air push rod to rotate in the first rotation direction in a plurality of operating cycles, so that the flue gas can normally enter the flue gas probe 2 to ensure the sampling. And in a single operating cycle, it rotates in the second rotation direction to generate a reverse thrust to push out the large particles that may accumulate in the probe inlet and the sampling branch pipeline in the reverse direction, avoiding the continuous accumulation of particles causing blockage. At least one rotation pause period of the operating cycle is set to allow the air flow and particles to have a short stationary state. During the pause period, the particles originally attached to the pipe wall or filter element may fall due to factors such as gravity, and then rotate in the reverse direction, which is more conducive to cleaning out these residual particles and further reducing the risk of blockage. Furthermore, according to the differences in the flue gas characteristics at different height points in the chimney, the detection equipment is adjusted in response and calibrated and optimized to reduce the probability of blockage and improve the continuous detection stability of the equipment.

[0076] Specifically, the calibration module is further used to determine the marked time, where

[0077] the calibration module is used to determine a single operating cycle in which the spiral air push rod rotates in the second rotation direction, and mark a plurality of moments at preset time intervals within the single operating cycle, and determine the marked moments as the marked time.

[0078] In implementation, it is necessary to select several detection moments of the current signal within the cycle duration of an operating cycle. The value range of the preset time interval can be [30, 60], and the interval unit is s. Preferably, for an operating cycle with a cycle duration of 8 min, the value of the preset time interval can be set to 40 s.

[0079] Specifically, the calibration module is used to obtain the operating electrical signals of the spiral air push rod at several marked moments within a single operating cycle, and calculate the average signal intensity of the operating electrical signals corresponding to the several marked moments.

[0080] Specifically, a single operating cycle in which the spiral air push rod rotates in the second rotation direction is selected as the research object because the rotation in the second rotation direction has the function of cleaning the large particles in the channel. The spiral air push rod will generate electrical signals related to its own operating state during operation, and the characteristics of these electrical signals will change with the change of the load of the spiral air push rod. Obtaining the operating electrical signals at several marked moments within a single operating cycle can comprehensively reflect the operating conditions of the spiral air push rod during the entire cleaning process. Calculating the average signal intensity of the operating electrical signals corresponding to these marked moments is to obtain a quantitative index that can represent the overall operating state of the spiral air push rod within the operating cycle. If the spiral air push rod encounters greater resistance, the motor needs to output more power, resulting in an increase in the intensity of the operating electrical signal, and the average signal intensity will also increase accordingly; conversely, if the operation is smooth, the average value will be within the normal range.

[0081] Specifically, the present invention takes a single operating cycle of the spiral air pushing rod rotating in the second rotation direction as the research object through the calibration module, marks several moments at preset time intervals as marking moments therein, and can understand the operating state of the spiral air pushing rod in the operation of cleaning large particles in real time and accurately by obtaining the operating electrical signals at these marking moments. By calculating the average value of the signal intensities of the operating electrical signals corresponding to the marking moments, the operating state of the equipment can be further quantified, and the degree of additional resistance suffered by the spiral air pushing rod during operation can be quantified. Furthermore, the subtle abnormalities in the equipment operation can be captured more timely and accurately.

[0082] Specifically, please refer to Figure 4 As shown, it is a logic flow chart for the calibration module of the embodiment of the present invention to perform calibration. The calibration module is used to calibrate the adjustment method of the spiral air pushing rod according to the comparison between the average value of the signal intensities and a preset signal intensity reference value. Among them,

[0083] If the average value of the signal intensities does not exceed the preset signal intensity reference value, the calibration module does not calibrate the adjustment method of the spiral air pushing rod;

[0084] If the average value of the signal intensities exceeds the preset signal intensity reference value, the calibration module controls the spiral air pushing rod to extend the operating duration of rotating in the second rotation direction, and the operating duration has a positive correlation with the average value of the signal intensities.

[0085] Specifically, the present invention can set the preset signal intensity reference value Rm according to the following experimental data;

[0086]

[0087] According to the above experimental data, the signal intensity reference value can be set according to the average value of the experimental results of 10 experiments. After calculation, the average value of the experimental results is 142.92 mA. Preferably, the signal intensity reference value Rm is set to 143 mA.

[0088] In implementation, the operating duration of the spiral air pushing rod rotating in the second rotation direction is controlled according to the average value of the signal intensities of the current signals. Exemplarily, to ensure that the operating duration of the adjusted spiral air pushing rod rotating in the second rotation direction meets the actual cleaning requirements, the adjusted operating duration should not be too large to avoid affecting the real-time performance of flue gas detection. The difference Rc after removing the dimension of the actual average value of the signal intensities and the signal intensity reference value can be calculated in advance. The operating duration t = [(Rc / Rm) + 1] × t0, where t0 is the duration of the operating cycle of the spiral air pushing rod rotating in the second rotation direction.

[0089] Specifically, under the condition that the average signal strength exceeds a preset reference value, the present invention indicates that the spiral air pushing rod encounters a relatively large resistance during operation. The reason is that a large number of large particles accumulate at the sampling branch pipeline or the probe filter element, resulting in an increase in the operating load of the equipment. The calibration module controls the spiral air pushing rod to extend the operating duration of rotation in the second rotation direction, which can more fully clean the blocked part and timely clean the accumulated particles, thus avoiding equipment failures caused by further aggravation of the blockage. Furthermore, according to the differences in the flue gas characteristics at different height points in the chimney, the detection equipment is adjusted and calibrated optimally to reduce the probability of blockage and improve the stability of the continuous detection of the equipment.

[0090] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0091] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An industrial flue gas continuity detection device based on autonomous verification, characterized in that: include: A smoke collecting box is installed on the outer wall of the chimney, and comprises an air inlet channel and a smoke probe, so as to introduce the smoke in the chimney into the smoke probe through the air inlet channel, and a spiral air push rod is arranged in the air inlet channel, which can rotate to make the smoke enter the smoke probe; The sensing analysis module includes a plurality of temperature sensors arranged on the inner wall of the chimney along the height direction to obtain the flue gas temperature at different height points, and a screening unit to screen the gas-solid separation characteristic interval according to the flue gas temperature change at different height points; The screening unit is used to calculate the flue gas temperature difference between adjacent height points in the height dimension, construct a temperature difference fluctuation curve of the flue gas temperature difference changing with time, and determine the temperature difference and slope corresponding to a number of data points on the temperature difference fluctuation curve; The screening unit is used to calculate the Pearson coefficient after removing the dimension of the temperature difference and slope corresponding to a number of data points in time series on the temperature difference fluctuation curve, screen out the temperature difference fluctuation curve whose Pearson coefficient meets the coefficient screening condition, and determine the gas-solid gradual separation characteristic interval according to the adjacent height points corresponding to the temperature difference fluctuation curve, and the coefficient screening condition is that the Pearson coefficient exceeds a preset coefficient threshold; A response module, which is connected to the smoke collection box and the induction analysis module respectively, and is used to determine whether the spiral air push rod should be adjusted in response and determine the adjustment method according to the position distribution of the gas-solid separation characteristic interval segment; Wherein, the adjustment method includes periodically changing the rotation direction of the spiral propeller and setting a rotation pause period; The verification module is connected to the response module and the smoke sampling box respectively, and is used to obtain the operating electrical signals of the spiral air push rod at consecutive marking moments in time sequence, and verify the adjustment mode of the spiral air push rod based on the signal strength of the operating electrical signals.

2. The industrial smoke continuity detection device based on autonomous verification according to claim 1 is characterized in that: The spiral thrust rod comprises a spiral blade and a rotating rod driving the spiral blade to rotate, and the spiral blade is in contact with the inner wall of the air inlet passage.

3. The industrial smoke continuity detection device based on autonomous verification according to claim 1 is characterized in that: The response module is used to determine the response adjustment of the spiral air push rod and determine the adjustment method based on the judgment result of the smoke collection box in the gas-solid gradual separation characteristic interval.

4. The industrial smoke continuity detection device based on autonomous verification according to claim 3 is characterized in that: The adjustment method includes the response module controlling the propeller to rotate in a first rotation direction in a plurality of operation cycles and in a second rotation direction in a single operation cycle; In which, a rotation pause period of at least one operation cycle is set when switching from rotating in the first rotation direction to rotating in the second rotation direction.

5. The industrial smoke continuity detection device based on autonomous verification according to claim 4 is characterized in that: The first rotation direction is the direction in which the spiral air pushing rod causes smoke to enter the smoke probe, and the second rotation direction is opposite to the first rotation direction.

6. The industrial smoke continuity detection device based on autonomous verification according to claim 4 is characterized in that: The verification module is also used to determine the marking time, wherein: The verification module is used to determine a single operation cycle in which the screw propeller rotates in the second rotation direction, and mark a number of moments at preset time intervals within the single operation cycle, and determine the marked moments as the marked moments.

7. The industrial smoke continuity detection device based on autonomous verification according to claim 6 is characterized in that: The verification module is used to obtain the operating electrical signals of the screw thrust rod at several marking moments in a single operating cycle, and calculate the average signal strength of the operating electrical signals corresponding to the several marking moments.

8. The industrial smoke continuity detection device based on autonomous verification according to claim 7 is characterized in that: The verification module is used to verify the adjustment mode of the screw propeller according to the comparison between the signal strength average value and the preset signal strength reference value, wherein: If the signal strength average value exceeds a preset signal strength reference value, the verification module controls the screw air thrust rod to extend the operating time of rotating in the second rotation direction, and the operating time is positively correlated with the signal strength average value.

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