Coal-fired flue gas pollutant emission detection system and method based on spectrum technology

Abstract

The invention relates to the technical field of gas pollutant pretreatment, in particular to a coal-fired flue gas pollutant emission detection system and method.The coal-fired flue gas pollutant emission detection system comprises a pretreatment module, a filtering module and a flue gas spectrum analysis module which are sequentially arranged in the flowing direction of a flue gas pipe, and the flue gas spectrum analysis module is used for measuring component data in flue gas; the pretreatment module comprises a temperature measurement module for measuring a real-time temperature value of flue gas in real time, an adsorbate measurement module for measuring a real-time adsorption value corresponding to water vapor and an adhesive in the flue gas, and a conversion airway module for controlling the flue gas pipe to be communicated with the flue gas spectrum analysis module based on the real-time temperature value and the real-time adsorption value; the system further comprises a processing module, the processing module is used for sending an adjusting instruction to the filtering module based on the real-time temperature value and the real-time adsorption value, and the filtering module adjusts the flue gas flowing track in the flue gas pipe based on the adjusting instruction. Interference in the flue gas detection process is reduced, the stability of a spectrum analysis assembly is guaranteed, and the flue gas component detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas pollutant pretreatment, and in particular to a system and method for detecting coal-fired flue gas pollutant emissions based on spectroscopy technology. Background Art

[0002] Coal-fired flue gas emissions contain a variety of pollutants, which pose a serious threat to the environment and human health. For example, sulfur dioxide and nitrogen oxides can cause acid rain, which has a serious impact on air quality; particles with a diameter of less than or equal to 10 microns can enter the human body through the respiratory system, posing a threat to people's health, etc. Therefore, it is necessary to use online monitoring systems, flue gas sampling and analysis, and other detection technologies to monitor and evaluate the concentration and emission of pollutants in flue gas in real time, so as to provide a scientific basis for the formulation of effective pollution control measures.

[0003] Among the existing flue gas detection technologies, spectral detection technology is different from traditional flue gas analysis methods. Spectral detection does not need to detect each pollutant separately, and can analyze multiple chemical components in the flue gas at the same time, greatly improving the detection efficiency and comprehensiveness. At the same time, spectral detection does not require chemical reactions or physical treatments on samples, and will not interfere with the normal emission of flue gas, but monitor the composition and concentration of flue gas in real time. Therefore, spectral detection has broad application prospects in coal-fired flue gas emissions.

[0004] However, pollutants in the flue gas will absorb, scatter or reflect the light emitted by the spectrometer, causing changes in the spectral signal; especially in high humidity environments, because sulfur dioxide is easily soluble in water, water vapor will significantly affect the accuracy of ultraviolet differential absorption spectroscopy in measuring sulfur dioxide. At the same time, pollutants in the flue gas may be deposited on the surface of the sensor, causing the sensor performance to deteriorate. Pollutants may also change the optical properties of the sensor, and long-term pollutant deposition may cause aging, wear or corrosion of spectrometer components, thereby affecting the stability and accuracy of the system. Therefore, the present invention provides a coal-fired flue gas pollutant emission detection system and method based on spectral technology to improve the accuracy of subsequent flue gas detection processes. Summary of the invention

[0005] To solve the above problems, the present invention provides a system and method for detecting coal-fired flue gas pollutant emissions based on spectral technology, which is used to reduce interference received during the flue gas detection process, ensure the stability of the spectral analysis component, and improve the accuracy of flue gas component detection.

[0006] In order to achieve the above-mentioned object, the technical solution of the present invention is as follows: a coal-fired flue gas pollutant emission detection system based on spectral technology, comprising a pretreatment module, a filtering module and a flue gas spectral analysis module arranged in sequence along the flow direction of the flue gas pipe;

[0007] The pre-processing module includes a temperature measurement module, an adsorbate measurement module and a conversion airway module; the temperature measurement module is used to measure the real-time temperature value of the flue gas in real time; the adsorbate measurement module is used to measure the real-time adsorption value corresponding to the water vapor and the adsorbate in the flue gas, and the adsorbate measurement module is also used to rotate based on the weight of the water vapor and the adsorbate in the flue gas; the conversion airway module is used to control the connection between the flue gas pipe and the flue gas spectrum analysis module based on the real-time temperature value and the real-time adsorption value;

[0008] Also included is a processing module, the processing module is used to send an adjustment instruction to the filtering module based on the real-time temperature value and the real-time adsorption value;

[0009] The flue gas spectrum analysis module is vertically connected to the flue gas pipe, and is used to measure component data in the flue gas and send the component data to the processing module for storage;

[0010] The filter module is used to adjust the flow trajectory of smoke in the smoke pipe based on the adjustment instruction.

[0011] The technical principle of the above scheme is as follows: the components are arranged in sequence according to the direction of smoke flow in the smoke pipe. First, the real-time temperature value and real-time adsorption value are measured by the temperature measurement module and the adsorbent measurement module to understand the smoke situation in real time and provide basic comparison conditions for subsequent adjustment and control. First, the water vapor and adhesion in the smoke are processed by the filter module, and the conversion airway module is controlled by the processing module, so that the smoke spectrum analysis module can analyze the components of the smoke under appropriate conditions.

[0012] The above scheme has the following beneficial effects:

[0013] 1. This solution can directly obtain real-time information of the flue gas by directly contacting the components with the flue gas in the flue duct, and then directly connect the flue gas spectrum analysis module, which has the advantage of easy maintenance and is convenient for direct analysis and processing of the flue gas.

[0014] 2. This scheme utilizes the characteristics of water vapor and adhesions in the flue gas. While using the adsorbent measurement module to measure the flue gas, it also achieves preliminary processing of the water vapor and adhesions in the flue gas to reduce the influencing factors in the flue gas, reduce the corrosion interference that may be caused by the adhesions in the flue gas, and affect the subsequent detection performance of the flue gas spectrum analysis module. At the same time, it reduces the detection interference of water vapor in subsequent measurements to improve the detection accuracy of the flue gas spectrum analysis module.

[0015] 3. This solution can not only slow down the flow rate of the smoke by adjusting the flow trajectory of the smoke in the smoke pipe through the filtering module to facilitate the detection and processing by the smoke spectrum analysis module, but also use the water vapor and adhesion in the smoke for sedimentation, reduce the interference received during the smoke detection process, and improve the accuracy of smoke component detection.

[0016] Furthermore, the adsorbent measurement module includes a plurality of arc-shaped condensation plates, and the condensation plates and the flow direction of the flue gas pipe are parallel to each other;

[0017] The two sides of the condensing plate are fixedly connected with a rotating shaft, the rotating shaft and the smoke pipe are rotatably matched, and a torsion spring is sleeved on the rotating shaft to keep the condensing plate in a parallel state in normal state;

[0018] A condensing tube is arranged circumferentially in the condensing plate, and an adjustment space is opened at the center of the rotating shaft, the adjustment space is connected to the condensing tube, and a plurality of bimetallic strips are arranged circumferentially in the adjustment space, which are deformed based on the temperature change of the adjustment space and the outside world, and the bimetallic strips are arranged in a ring with the condensing tube as the center;

[0019] When the temperature difference between the temperature in the flue gas pipe and the temperature in the adjustment space increases, the diameter of the adjustment space of the adjacent bimetallic strips increases.

[0020] Beneficial effect: When the flue gas in the flue gas pipe flows through the condensation plate, the water vapor and adhesion in the flue gas are condensed and adsorbed on the condensation plate based on the cooling effect of the condensation tube inside the condensation plate, so that the content of water vapor and adhesion in the flue gas is reduced to reduce the impact on the subsequent flue gas spectrum analysis module. At the same time, the diameter of the space is adjusted through the temperature change characteristics of the bimetallic strip to ensure the condensation effect of the condensation plate.

[0021] Furthermore, a light source for emitting parallel light and a photosensitive component whose resistance value changes based on the light intensity are provided in the flue gas pipe, and the light source and the photosensitive component are symmetrically arranged with the adsorbent measurement module as the center;

[0022] When the condensation plate and the flue gas pipe are in a horizontal state, the condensation plate blocks the light source; when the condensation plate rotates, part of the light source irradiates the photosensitive component;

[0023] The processing module is also used to record and store the corresponding relationship between the resistance change of the photosensitive component and the real-time adsorption value.

[0024] Beneficial effects: The rotation of the condensation plate is determined by the change in the resistance of the photosensitive component, so as to determine the content of water vapor and adhesions in the flue gas at the current time, and then determine the size of the real-time adsorption value to facilitate the subsequent control of the filtration module; at the same time, based on the real-time adsorption value, it can be determined whether to start the conversion airway module to enable the flue gas spectrum analysis module to perform gas detection, so as to reduce the interference with the detection accuracy of the flue gas spectrum analysis module when the content of water vapor and adhesions in the flue gas is high.

[0025] Further, the filter module includes a plurality of staggered baffles, a heat exchange tube is opened in the baffle, the heat exchange tube is connected to the condenser tube, a drive shaft is connected to one side of the baffle, a drive member is coaxially fixedly connected to the drive shaft, and the drive member is electrically connected to the processing module;

[0026] The processing module is also used to obtain the corresponding real-time adsorption value based on the change in resistance value, compare the real-time adsorption value with the set first standard value, and if the real-time adsorption value is greater than the first standard value, calculate the phase difference ratio between the real-time adsorption value and the first standard value, and then compare the real-time temperature value with the set second standard value. If the real-time temperature value is greater than the second standard value, calculate the adjustment ratio between the real-time temperature value and the second standard value, increase the phase difference ratio based on the adjustment ratio to generate a first adjustment instruction, and then send the first adjustment instruction to the driver; if the real-time temperature value is less than the second standard value, calculate the adjustment ratio between the real-time temperature value and the second standard value, reduce the phase difference ratio based on the adjustment ratio to generate a second adjustment instruction, and then send the second adjustment instruction to the driver; if the real-time adsorption value is less than the first standard value, send a hold instruction to the driver.

[0027] Beneficial effect: Based on the comparison between the real-time temperature value and the real-time adsorption value, they are compared with the first standard value and the second standard value respectively to generate corresponding first adjustment instructions and second adjustment instructions to control the driving member to drive the baffle to rotate, so as to form a number of obstacles in the smoke pipe to adjust the flow trajectory of the smoke in the smoke pipe, thereby increasing the contact area between the baffle and the smoke, so as to realize secondary treatment of water vapor and adhesion in the smoke.

[0028] Furthermore, a pressure sensor is provided on one side of the baffle plate close to the adsorbent measurement module, and the pressure sensor is used to measure the real-time pressure data of the smoke blowing on the baffle plate, and send the real-time pressure data to the processing module;

[0029] The processing module is also used to compare the real-time pressure data with the set start value. If the real-time pressure data is greater than the start value, a standby instruction is sent to the airway conversion module. If the real-time pressure data is less than the start value, a start instruction is sent to the airway conversion module.

[0030] Beneficial effect: By comparing the real-time pressure data with the start value, it is possible to determine whether the current wind force interferes with the rotation of the baffle, so as to reduce the influence of wind force during the rotation of the baffle, resulting in excessive or insufficient rotation angles.

[0031] Furthermore, the processing module is also used to compare the component data with the set rated type. If the component data is consistent with the rated type, an adjustment instruction corresponding to the rated type is sent to the driver; if the component data is inconsistent with the rated type, a maintenance instruction is sent to the driver.

[0032] Beneficial effect: Different treatment methods are adopted according to the specific components in the flue gas, so as to improve the treatment efficiency of the flue gas containing the rated type through the filtering module and improve the measurement accuracy of the flue gas containing the rated type.

[0033] Furthermore, the processing module also includes a time recording module, which is used to record the continuous cleaning time, compare the continuous cleaning time with the set rated time, and send a cleaning instruction to the processing module if the continuous cleaning time is greater than the rated time; if the continuous cleaning time is less than the rated time, send a maintenance instruction to the processing module;

[0034] The processing module is also used to obtain the real-time pressure data of the current time based on the cleaning instruction and compare it with the set first parameter. If the real-time pressure data is greater than the first parameter, the real-time temperature value is compared with the set second parameter. If the real-time temperature value is greater than the second parameter, the processing module sends a reset instruction to the airway conversion module and the filter module, and at the same time, the processing module sends a stop instruction to the flue gas spectrum analysis module;

[0035] If the real-time temperature value is less than the second parameter, or the real-time pressure data is less than one of the first parameters, a waiting instruction is sent to the airway conversion module, the filter module and the flue gas spectrum analysis module.

[0036] Beneficial effects: First, the cleaning time is recorded to achieve regular cleaning of the inside of the flue pipe, reducing the impact of impurities attached to the surface of each module in the flue pipe. The gas inside the current flue pipe is detected through the real-time temperature value, and the wind that reaches the appropriate temperature is blown on the surface of each module to achieve cleaning of each module, so as to ensure the detection accuracy of the subsequent flue gas spectrum analysis module.

[0037] Furthermore, the processing module is also used to compare the real-time adsorption value with the set third parameter when the real-time pressure data is greater than the first parameter. If the real-time adsorption value is less than the third parameter, the processing module sends a reset instruction to the airway conversion module and the filter module, and the processing module sends a stop instruction to the flue gas spectrum analysis module; if the real-time adsorption value is greater than the third parameter, a cleaning adjustment instruction is sent to the airway conversion module and the filter module, and the processing module sends a stop instruction to the flue gas spectrum analysis module.

[0038] Beneficial effect: By obtaining the real-time adsorption value at the current time, the working condition of the conversion airway module can be adjusted, thereby reducing the damage to the flue gas spectrum analysis module caused by flue gas impurities driven by strong wind, thereby reducing the impact of each sensor in the flue gas spectrum analysis module, and extending the use time and recognition accuracy of the flue gas spectrum analysis module.

[0039] Furthermore, the flue gas spectrum analysis module further includes an optical path adjustment module, which is used to adjust the optical path length between the flue gas spectrum analysis module and the ventilation port;

[0040] The processing module is also used to compare the real-time adsorption value with the set rated value. If the real-time adsorption value is greater than the rated value, an optical path increase instruction is sent to the optical path adjustment module; if the real-time adsorption value is less than the rated value, an optical path reduction instruction is sent to the optical path adjustment module.

[0041] Beneficial effect: When the smoke comes into contact with the smoke spectrum analysis module, the light path is adjusted by changing between the light path and the light intensity to reduce the influence of the measurement result of the smoke spectrum analysis module.

[0042] Further, a method for detecting coal-fired flue gas pollutant emissions based on spectral technology, according to the above-mentioned coal-fired flue gas pollutant emission detection system, comprises the following steps: step 1, sequentially arranging the pretreatment module, the filtering module and the flue gas spectrum analysis module according to the order of flue gas flow in the flue pipe;

[0043] Step 2: The temperature measurement module in the flue gas pipe obtains the real-time temperature value, and the processing module determines the resistance change of the photosensitive component by the degree of shielding of the light source by the condensation plate, and confirms the real-time adsorption value by the corresponding relationship between the resistance change of the photosensitive component and the real-time adsorption value. The control panel controls the baffle to adjust the flow trajectory of the flue gas in the flue gas pipe based on the real-time temperature value and the real-time adsorption value;

[0044] Step 3: The control panel controls the airway conversion module based on real-time pressure data to connect the flue gas pipe with the flue gas spectrum analysis module; then controls the airway conversion module, the filter module and the flue gas spectrum analysis module based on the cleaning time, the real-time temperature value and the real-time adsorption value to achieve flue gas pipe cleaning.

[0045] Beneficial effects: The flow trajectory of the flue gas is adjusted through the filtering module to reduce the influence of water vapor and adhesion during the flue gas detection process. At the same time, through the determination of real-time temperature value and real-time adsorption value, the natural flow of the flue gas is used to clean the flue gas pipe and the flue gas spectrum analysis module to reduce the interference of adhesion that may remain on the surface of the flue gas spectrum analysis module, so as to ensure the stability of the spectrum analysis component and improve the accuracy of flue gas component detection.

[0046] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of an embodiment of a coal-fired flue gas pollutant emission detection system based on spectroscopy technology of the present invention;

[0048] Figure 2 It is a schematic diagram of the main view of the flue gas duct in the embodiment of the coal-fired flue gas pollutant emission detection system based on spectral technology of the present invention;

[0049] Figure 3 It is a side view schematic diagram of a flue gas duct in an embodiment of the coal-fired flue gas pollutant emission detection system based on spectral technology of the present invention;

[0050] Figure 4 for Figure 1 Schematic diagram of the transverse axis.

[0051] The figure marks in the drawings of the specification include: 1. flue gas pipe; 2. temperature measurement module; 3. adsorbent measurement module; 31. rotating shaft; 32. condenser; 33. bimetallic strip; 4. filter module; 41. pressure sensor; 5. airway conversion module; 6. flue gas spectrum analysis module; 7. light source; 71. photosensitive component. DETAILED DESCRIPTION

[0052] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The following is further described in detail through specific implementation methods:

[0056] Embodiment 1:

[0057] As attached Figures 1 to 4As shown: a coal-fired flue gas pollutant emission detection system based on spectral technology, including a pretreatment module, a filtering module 4 and a flue gas spectral analysis module 6 arranged in sequence along the flow direction of the flue gas pipe 1.

[0058] The pretreatment module includes a temperature measurement module 2, an adsorbent measurement module 3 and an airway conversion module 5; the temperature measurement module 2 is used to measure the real-time temperature value of the flue gas in real time. In this embodiment, the temperature measurement module 2 is a temperature sensor, which is a prior art and will not be described in detail in this embodiment.

[0059] The adsorbent measuring module 3 is used to measure the real-time adsorption values ​​corresponding to the water vapor and the adherents in the flue gas, and the adsorbent measuring module 3 is also used to rotate based on the weight of the water vapor and the adherents in the flue gas; wherein, the adsorbent measuring module 3 includes a plurality of arc-shaped condensation plates, and the flow direction of the condensation plates and the flue gas pipe 1 are parallel to each other; a rotating shaft 31 is fixedly connected to both sides of the condensation plate, the rotating shaft 31 is matched with the flue gas pipe 1 for rotation, and a torsion spring (not shown in the figure) is sleeved on the rotating shaft 31 for keeping the condensation plate in a parallel state in normal state; a condensation tube 32 is arranged circumferentially inside the condensation plate, and an adjustment space is opened at the center of the rotating shaft 31, the adjustment space is connected with the condensation tube 32, and a plurality of bimetallic strips 33 that are deformed based on the temperature changes of the adjustment space and the outside are arranged circumferentially inside the adjustment space, and the bimetallic strips 33 are arranged in a ring with the condensation tube 32 as the center; when the temperature difference between the temperature in the flue gas pipe 1 and the temperature in the adjustment space increases, the diameter of the adjustment space of the adjacent bimetallic strips 33 becomes larger.

[0060] For example, when the flue gas in the flue gas pipe 1 flows through the condensation plate, based on the cooling effect of the condensation tube 32 inside the condensation plate, the water vapor and adhesion in the flue gas are condensed and adsorbed on the condensation plate, so that the weight of the condensation plate increases and overcomes the resistance of the torsion spring to move downward, so as to increase the flue gas resistance between the condensation plate and the inside of the flue gas pipe 1, slow down the flow speed of the flue gas, so that the water vapor and adhesion condense and adsorb on the condensation plate, so that the content of water vapor and adhesion in the flue gas decreases, so as to reduce the impact on the subsequent flue gas spectrum analysis module 6. At the same time, when the temperature in the flue gas pipe 1 gradually increases, the diameter of the adjustment space is increased through the temperature change characteristics of the bimetallic strip 33, so as to cool down the excessive condensate in the condensation tube 32 to ensure the condensation effect of the condensation plate.

[0061] A light source 7 for emitting parallel light and a photosensitive component 71 whose resistance changes based on light intensity are provided in the flue gas pipe 1. The light source 7 and the photosensitive component 71 are symmetrically arranged with the adsorbent measuring module 3 as the center. When the condensation plate and the flue gas pipe 1 are in a horizontal state, the condensation plate blocks the light source 7. When the condensation plate rotates, part of the light source 7 irradiates the photosensitive component 71.

[0062] The airway conversion module 5 is used to control the connection between the flue gas pipe 1 and the flue gas spectrum analysis module 6 based on the real-time temperature value and the real-time adsorption value. In this embodiment, the airway conversion module 5 is a solenoid valve, which is a prior art and will not be described in detail in this embodiment.

[0063] It also includes a processing module, which is used to send adjustment instructions to the filtering module 4 based on the real-time temperature value and the real-time adsorption value. The processing module is also used to record and store the corresponding relationship between the resistance change of the photosensitive component 71 and the real-time adsorption value.

[0064] The flue gas spectrum analysis module 6 is vertically connected to the flue gas pipe 1 and is used to measure component data in the flue gas and send the component data to the processing module for storage. The flue gas spectrum analysis module 6 is a prior art and will not be described in detail in this embodiment.

[0065] The filter module 4 is used to adjust the flow trajectory of the flue gas in the flue pipe 1 based on the adjustment instructions. The filter module 4 includes a plurality of staggered baffles, and a heat exchange tube is opened in the baffle. The heat exchange tube is connected to the condenser tube 32. A drive shaft is connected to one side of the baffle. The drive shaft is coaxially clamped with a drive member. The drive member is a motor. The drive member is electrically connected to the processing module, and adjacent drive shafts are connected by chains.

[0066] The processing module is also used to obtain the corresponding real-time adsorption value based on the change in resistance value, compare the real-time adsorption value with the set first standard value, and if the real-time adsorption value is greater than the first standard value, calculate the phase difference ratio between the real-time adsorption value and the first standard value, and then compare the real-time temperature value with the set second standard value. If the real-time temperature value is greater than the second standard value, calculate the adjustment ratio between the real-time temperature value and the second standard value, increase the phase difference ratio based on the adjustment ratio to generate a first adjustment instruction, and then send the first adjustment instruction to the driver; if the real-time temperature value is less than the second standard value, calculate the adjustment ratio between the real-time temperature value and the second standard value, reduce the phase difference ratio based on the adjustment ratio to generate a second adjustment instruction, and then send the second adjustment instruction to the driver; if the real-time adsorption value is less than the first standard value, send a hold instruction to the driver.

[0067] For example, during the rotation of the baffle of the filter module 4, the real-time adsorption value is compared to determine the impurity concentration content of the flue gas at the current time, so as to generate a first adjustment instruction to control the rotation of the baffle, and then the temperature influence at the current time is determined by the real-time temperature value, so as to generate a second adjustment instruction to readjust the original baffle rotation amplitude, and form a number of obstacles in the flue pipe 1 to adjust the flow trajectory of the flue gas in the flue pipe 1, thereby increasing the contact area between the baffle and the flue gas, so as to achieve secondary processing of water vapor and adhesions in the flue gas, so as to reduce the influencing factors in the flue gas, reduce the corrosion interference that may be caused by adhesions in the flue gas, and affect the subsequent detection performance of the flue gas spectrum analysis module 6, and at the same time reduce the detection interference of water vapor in subsequent measurements, so as to improve the detection accuracy of the flue gas spectrum analysis module 6.

[0068] A pressure sensor 41 is provided on one side of the baffle plate close to the adsorbent measuring module 3. The pressure sensor 41 is used to measure the real-time pressure data of the smoke blowing on the baffle plate, and send the real-time pressure data to the processing module; the processing module is also used to compare the real-time pressure data with the set starting value. If the real-time pressure data is greater than the starting value, a standby instruction is sent to the airway conversion module 5; if the real-time pressure data is less than the starting value, a start instruction is sent to the airway conversion module 5.

[0069] The processing module also includes a time recording module, which is used to record the continuous cleaning time and compare the continuous cleaning time with the set rated time. If the continuous cleaning time is greater than the rated time, a cleaning instruction is sent to the processing module; if the continuous cleaning time is less than the rated time, a maintenance instruction is sent to the processing module.

[0070] The processing module is also used to obtain the real-time pressure data of the current time based on the cleaning instruction and compare it with the set first parameter. If the real-time pressure data is greater than the first parameter, the real-time temperature value is compared with the set second parameter. If the real-time temperature value is greater than the second parameter, the processing module sends a reset instruction to the airway conversion module 5 and the filter module 4, and at the same time the processing module sends a stop instruction to the flue gas spectrum analysis module 6; if the real-time temperature value is less than the second parameter, or the real-time pressure data is less than one of the first parameters, a wait instruction is sent to the airway conversion module 5, the filter module 4 and the flue gas spectrum analysis module 6.

[0071] For example, during long-term operation, impurities in the flue gas will gradually accumulate and affect the subsequent measurement of the real-time adsorption value. First, the cleaning time is recorded to achieve regular cleaning of the inside of the flue pipe 1 to reduce the impact of impurities attached to the surfaces of each module in the flue pipe 1.

[0072] By comparing the real-time temperature values, it is determined whether the wind temperature at the current time can affect the falling of impurities attached to the surface of each component. By detecting the gas inside the current flue gas pipe 1, the wind reaching the appropriate temperature is blown on the surface of each module, thereby achieving the cleaning work of each module to ensure the detection accuracy of the subsequent flue gas spectrum analysis module 6.

[0073] The processing module is also used to compare the real-time adsorption value with the set third parameter when the real-time pressure data is greater than the first parameter. If the real-time adsorption value is less than the third parameter, the processing module sends a reset instruction to the airway conversion module 5 and the filter module 4, and the processing module sends a stop instruction to the flue gas spectrum analysis module 6; if the real-time adsorption value is greater than the third parameter, a cleaning adjustment instruction is sent to the airway conversion module 5 and the filter module 4, and the processing module sends a stop instruction to the flue gas spectrum analysis module 6.

[0074] For example, during the continuous flow of smoke in the smoke, the greater the wind force, the faster the flow rate of substances or impurities in the smoke, which makes the smoke impurities cause greater erosion damage to the smoke spectrum analysis module 6. By obtaining the real-time adsorption value at the current time, the working condition of the conversion airway module 5 is adjusted to reduce the damage to the smoke spectrum analysis module 6 caused by smoke impurities driven by strong wind, thereby reducing the impact of each sensor in the smoke spectrum analysis module 6, so as to extend the service life and recognition accuracy of the smoke spectrum analysis module 6.

[0075] A method for detecting coal-fired flue gas pollutant emissions based on spectral technology, according to the above-mentioned coal-fired flue gas pollutant emission detection system, comprises the following steps: step 1, sequentially arranging the pretreatment module, the filtering module 4 and the flue gas spectrum analysis module 6 according to the flue gas flow sequence in the flue gas pipe 1;

[0076] Step 2: Based on the temperature measurement module 2 in the flue gas pipe 1, the real-time temperature value is obtained. The processing module then determines the resistance change of the photosensitive component 71 through the degree of shielding of the light source 7 by the condensation plate. The real-time adsorption value is confirmed through the corresponding relationship between the resistance change of the photosensitive component 71 and the real-time adsorption value. The control panel controls the baffle to adjust the flow trajectory of the flue gas in the flue gas pipe 1 based on the real-time temperature value and the real-time adsorption value.

[0077] Step 3: The control panel controls the airway conversion module 5 based on the real-time pressure data to connect the flue gas pipe 1 with the flue gas spectrum analysis module 6; and then controls the airway conversion module 5, the filter module 4 and the flue gas spectrum analysis module 6 based on the cleaning time, the real-time temperature value and the real-time adsorption value to achieve the cleaning of the flue gas pipe 1.

[0078] The principle and effect of this detection method are the same as those of the above embodiment, and will not be described in detail in this embodiment.

[0079] Embodiment 2:

[0080] The difference from Example 1 is that the processing module is also used to compare the component data with the set rated type. If the component data is consistent with the rated type, an adjustment instruction corresponding to the rated type is sent to the driver; if the component data is inconsistent with the rated type, a maintenance instruction is sent to the driver.

[0081] For example, during the long-term operation of the processing module, different processing methods are adopted according to the specific components in the flue gas, so as to reduce the repeated comparison process of the processing module, so as to improve the processing efficiency of the flue gas containing the rated type through the filtering module 4, so as to reduce the interference received during the flue gas detection process, and thus improve the measurement accuracy of the flue gas containing the rated type.

[0082] Embodiment 3:

[0083] The difference from Example 2 is that the flue gas spectrum analysis module 6 also includes an optical path adjustment module (not shown in the figure), which is used to adjust the optical path length between the flue gas spectrum analysis module 6 and the ventilation port; the processing module is also used to compare the real-time adsorption value with the set rated value. If the real-time adsorption value is greater than the rated value, an optical path increase instruction is sent to the optical path adjustment module; if the real-time adsorption value is less than the rated value, an optical path reduction instruction is sent to the optical path adjustment module.

[0084] For example, when the smoke comes into contact with the smoke spectrum analysis module 6, the particulate matter and gas components in the smoke will absorb part of the light, resulting in a decrease in the light intensity. The longer the optical path (optical path), the greater the degree of light absorption, and the weaker the light intensity received by the smoke analysis. Weaker light intensity may not accurately reflect the actual concentration of various components in the smoke, while the shorter the optical path, the higher the light intensity, which affects the measurement results of the smoke spectrum analysis module 6.

[0085] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A coal-fired flue gas pollutant emission detection system based on spectral technology, characterized in that: It comprises a pre-treatment module, a filtering module (4) and a flue gas spectrum analysis module (6) which are arranged in sequence along the flow direction of the flue gas pipe (1); The pre-processing module comprises a temperature measurement module (2), an adsorbent measurement module (3) and an airway conversion module (5); the temperature measurement module (2) is used to measure the real-time temperature value of the flue gas in real time; The adsorbent measurement module (3) is used to measure the real-time adsorption values ​​corresponding to the water vapor and the adherents in the flue gas, and the adsorbent measurement module (3) is also used to rotate based on the weight of the water vapor and the adherents in the flue gas; the airway conversion module (5) is used to control the flue gas pipe (1) to communicate with the flue gas spectrum analysis module (6) based on the real-time temperature value and the real-time adsorption value; It also includes a processing module, which is used to send an adjustment instruction to the filtering module (4) based on the real-time temperature value and the real-time adsorption value; The smoke spectrum analysis module (6) is vertically connected to the smoke pipe (1), and the smoke spectrum analysis module (6) is used to measure component data in the smoke and send the component data to the processing module for storage; The filter module (4) is used to adjust the flow trajectory of smoke in the smoke pipe (1) based on the adjustment instruction.

2. The coal-fired flue gas pollutant emission detection system based on spectral technology according to claim 1 is characterized in that: The adsorbent measurement module (3) comprises a plurality of arc-shaped condensation plates, wherein the condensation plates and the flow direction of the flue gas pipe (1) are parallel to each other; A rotating shaft (31) is fixedly connected to both sides of the condensation plate, the rotating shaft (31) and the smoke pipe (1) are rotatably matched, and a torsion spring is sleeved on the rotating shaft (31) for keeping the condensation plate in a parallel state in a normal state; A condensation tube (32) is arranged circumferentially inside the condensation plate, and an adjustment space is opened at the center of the rotating shaft (31), the adjustment space is connected to the condensation tube (32), and a plurality of bimetallic strips (33) are arranged circumferentially inside the adjustment space. The bimetallic strips (33) are deformed based on the temperature change of the adjustment space and the outside world, and the bimetallic strips (33) are arranged in a ring shape with the condensation tube (32) as the center. When the temperature difference between the temperature in the smoke pipe (1) and the temperature in the adjustment space increases, the diameter of the adjustment space of the adjacent bimetallic strips (33) increases.

3. The coal-fired flue gas pollutant emission detection system based on spectral technology according to claim 2 is characterized in that: A light source (7) for emitting parallel light and a photosensitive component (71) whose resistance value changes based on light intensity are provided in the flue gas pipe (1); the light source (7) and the photosensitive component (71) are symmetrically arranged with the adsorbent measuring module (3) as the center; When the condensation plate and the smoke pipe (1) are in a horizontal state, the condensation plate blocks the light source (7); when the condensation plate rotates, part of the light source (7) illuminates the photosensitive component (71); The processing module is also used to record and store the corresponding relationship between the resistance change of the photosensitive component (71) and the real-time adsorption value.

4. The coal-fired flue gas pollutant emission detection system based on spectral technology according to claim 3 is characterized in that: The filter module (4) comprises a plurality of staggered baffles, each of which has a heat exchange tube formed therein, the heat exchange tube being in communication with the condenser tube (32), a drive shaft being connected to one side of the baffle, a drive member being coaxially fixedly connected to the drive shaft, and the drive member being electrically connected to the processing module; The processing module is also used to obtain the corresponding real-time adsorption value based on the change in resistance value, compare the real-time adsorption value with a set first standard value, and if the real-time adsorption value is greater than the first standard value, calculate the difference ratio between the real-time adsorption value and the first standard value, and then compare the real-time temperature value with a set second standard value, and if the real-time temperature value is greater than the second standard value, calculate the adjustment ratio between the real-time temperature value and the second standard value, increase the difference ratio based on the adjustment ratio to generate a first adjustment instruction, and then send the first adjustment instruction to the driving member; If the real-time temperature value is less than the second standard value, then calculating the adjustment ratio between the real-time temperature value and the second standard value, reducing the phase difference ratio based on the adjustment ratio to generate a second adjustment instruction, and then sending the second adjustment instruction to the driving member; If the real-time adsorption value is less than the first standard value, a holding instruction is sent to the driving member.

5. The coal-fired flue gas pollutant emission detection system based on spectral technology according to claim 4 is characterized in that: A pressure sensor (41) is provided on one side of the baffle plate close to the adsorbent measurement module (3), and the pressure sensor (41) is used to measure real-time pressure data of the smoke blowing on the baffle plate, and send the real-time pressure data to the processing module; The processing module is also used to compare the real-time pressure data with the set start value, and if the real-time pressure data is greater than the start value, send a standby instruction to the airway conversion module (5); if the real-time pressure data is less than the start value, send a start instruction to the airway conversion module (5).

6. The coal-fired flue gas pollutant emission detection system based on spectral technology according to claim 5 is characterized in that: The processing module is also used to compare the component data with the set rated type. If the component data is consistent with the rated type, an adjustment instruction corresponding to the rated type is sent to the driver; if the component data is inconsistent with the rated type, a maintenance instruction is sent to the driver.

7. The coal-fired flue gas pollutant emission detection system based on spectral technology according to claim 6 is characterized in that: The processing module also includes a time recording module, which is used to record the continuous cleaning time and compare the continuous cleaning time with the set rated time. If the continuous cleaning time is greater than the rated time, a cleaning instruction is sent to the processing module; if the continuous cleaning time is less than the rated time, a maintenance instruction is sent to the processing module; The processing module is also used to obtain the real-time pressure data at the current time based on the cleaning instruction and compare it with the set first parameter. If the real-time pressure data is greater than the first parameter, the real-time temperature value is compared with the set second parameter. If the real-time temperature value is greater than the second parameter, the processing module sends a reset instruction to the airway conversion module (5) and the filter module (4), and at the same time, the processing module sends a stop instruction to the flue gas spectrum analysis module (6); If the real-time temperature value is less than the second parameter, or the real-time pressure data is less than one of the first parameters, a waiting instruction is sent to the airway conversion module (5), the filter module (4) and the flue gas spectrum analysis module (6).

8. The coal-fired flue gas pollutant emission detection system based on spectral technology according to claim 7 is characterized in that: The processing module is also used to compare the real-time adsorption value with a set third parameter when the real-time pressure data is greater than the first parameter; if the real-time adsorption value is less than the third parameter, the processing module sends a reset instruction to the airway conversion module (5) and the filter module (4), and at the same time, the processing module sends a stop instruction to the flue gas spectrum analysis module (6); if the real-time adsorption value is greater than the third parameter, a cleaning adjustment instruction is sent to the airway conversion module (5) and the filter module (4), and at the same time, the processing module sends a stop instruction to the flue gas spectrum analysis module (6).

9. The coal-fired flue gas pollutant emission detection system based on spectral technology according to claim 8 is characterized in that: The flue gas spectrum analysis module (6) further comprises an optical path adjustment module, the optical path adjustment module being used to adjust the optical path length between the flue gas spectrum analysis module (6) and the ventilation port; The processing module is also used to compare the real-time adsorption value with the set rated value. If the real-time adsorption value is greater than the rated value, an optical path increase instruction is sent to the optical path adjustment module; if the real-time adsorption value is less than the rated value, an optical path reduction instruction is sent to the optical path adjustment module.

10. A method for detecting coal-fired flue gas pollutant emissions based on spectral technology, characterized in that: The method for detecting the emission of coal-fired flue gas pollutants of the coal-fired flue gas pollutant emission detection system according to any one of claims 1 to 9 comprises the following steps: step 1, sequentially arranging the pretreatment module, the filtering module (4) and the flue gas spectrum analysis module (6) according to the order of flue gas flow in the flue gas pipe (1); Step 2: Based on the temperature measurement module (2) in the flue gas pipe (1), a real-time temperature value is obtained. The processing module then determines the resistance change of the photosensitive component (71) by the degree of shielding of the light source (7) by the condensation plate. The real-time adsorption value is confirmed by the corresponding relationship between the resistance change of the photosensitive component (71) and the real-time adsorption value. The control panel controls the baffle to adjust the flow trajectory of the flue gas in the flue gas pipe (1) based on the real-time temperature value and the real-time adsorption value. Step 3: The control panel controls the airway conversion module (5) based on the real-time pressure data to connect the flue gas pipe (1) with the flue gas spectrum analysis module (6); and then controls the airway conversion module (5), the filter module (4) and the flue gas spectrum analysis module (6) based on the cleaning time, the real-time temperature value and the real-time adsorption value to achieve flue gas pipe (1) cleaning.

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