A method and system for determining sulfite in the slurry of a desulfurization tower

Abstract

The present application relates to a method and system for determining sulfite in the slurry of a desulfurization tower, belonging to the technical field of sulfite determination. It includes a desulfurization tower outlet pipeline, a sampling unit, a pretreatment unit, an optical detection unit, and a data processing unit. The present application has the effect of determining sulfite. The optical detection unit includes components such as an optical fiber probe, an automatic mechanism, and a detector. The automatic mechanism can drive the optical fiber probe to flip, enabling its end to measure the sample, improving the measurement accuracy. The automatic mechanism includes components such as a base, a cup body, a transportation pipeline, a support frame, and a driving mechanism, which can realize the automatic pushing and flipping of the optical fiber probe, with a high degree of automation, effectively improving the flexibility during use, simplifying the operation process, reducing the steps of manual participation, and being suitable for large-scale popularization and use.

Description

Technical Field

[0001] This application relates to the technical field of sulfite determination, and particularly to a method and system for determining sulfite in the slurry of a desulfurization tower. Background Art

[0002] In industrial production, especially in coal-fired power plants, in order to reduce sulfur dioxide emissions, wet flue gas desulfurization technology is widely used. One of the core devices of this technology is the desulfurization tower. The slurry in it generates calcium sulfite and a small amount of calcium sulfate by absorbing SO2 in the flue gas. However, the presence of sulfite ions will not only affect the operation efficiency of the entire system but also may cause problems such as scaling and corrosion. Therefore, accurately measuring the sulfite content in the slurry is crucial for ensuring the desulfurization effect. With the continuous improvement of environmental protection requirements, the demand for real-time monitoring of the sulfite concentration in the slurry of the desulfurization tower is becoming increasingly urgent.

[0003] To solve similar problems, existing technologies usually use a variety of methods to determine sulfite. Common methods include:

[0004] Titration method: The sulfite concentration is determined by adding a standard solution for a titration reaction. This method can obtain relatively accurate results, but the operation is cumbersome and time-consuming, and it is difficult to achieve on-line continuous monitoring.

[0005] Conductivity method: The sulfite concentration is indirectly estimated by measuring the change in the conductivity of the solution. This method is simple and fast to operate, but due to being greatly affected by factors such as temperature and pH value, the accuracy is low.

[0006] Ultraviolet spectroscopy method: Quantitative analysis is carried out by using the absorbance characteristics of sulfite at a specific wavelength. This non-contact measurement method has a high accuracy, but the instrument cost is high and the maintenance is complex.

[0007] Chromatography method: By separating and detecting the sulfite components in the sample, relatively high accuracy can be obtained, but the operation steps are complicated and it is not suitable for on-line monitoring.

[0008] Nephelometry method: The sulfite concentration is inferred by measuring the turbidity of the solution. It is simple and easy to perform, but the sensitivity is low and it is easily affected by other suspended solids.

[0009] Although the above methods can meet the sulfite determination requirements under laboratory conditions to a certain extent, there are still obvious deficiencies in actual industrial applications. These methods generally cannot achieve real-time on-line monitoring, and are greatly affected by environmental factors, resulting in unstable results. In addition, most of the methods have complex operations and high costs, and are not convenient for large-scale popularization and application. These problems limit their application scope and technical effects in actual industrial scenarios. Summary of the Invention

[0010] The purpose of this application is to provide a method and system for measuring sulfite in the slurry of a desulfurization tower to solve the problems raised in the above-mentioned background technology.

[0011] A sulfite measurement system in the slurry of a desulfurization tower provided by this application adopts the following technical solutions: It includes a desulfurization tower outlet pipeline and a sampling unit connected to the desulfurization tower outlet pipeline. The other end of the sampling unit is connected to a pretreatment unit, and the other end of the pretreatment unit is provided with an optical detection unit, and the optical detection unit is connected to a data processing unit;

[0012] The sampling unit includes an automatic valve and a sampling pipeline. One end of the sampling pipeline is connected to the desulfurization tower outlet pipeline through the automatic valve.

[0013] By adopting the above technical solutions, the slurry samples on the desulfurization tower outlet pipeline can be regularly collected through the automatic valve and transported to the pretreatment unit through the sampling pipeline for pretreatment.

[0014] Preferably, the pretreatment unit includes a filter, a dilution pump, and a heating device. The end of the sampling pipeline far from the automatic valve is connected to the filter. The bottom end of the filter is provided with a heating device, and a dilution pump is provided between the filter and the heating device.

[0015] By adopting the above technical solutions, the filter can effectively remove the suspended matter and impurities in the sample. The dilution pump can adjust the concentration of the sample to meet the requirements of optical detection, and the heating device performs heating treatment on the sample.

[0016] Preferably, the optical detection unit includes an optical fiber probe, an automatic mechanism, and a detector. The outer top end of the optical fiber probe is connected to the automatic mechanism, and a detector is provided at the top end.

[0017] By adopting the above technical solutions, the automatic mechanism can drive the optical fiber probe to move. The optical fiber probe can emit a light source with a specific wavelength to the pretreated sample and receive the reflected light signal. The detector converts the received reflected light signal into an electrical signal and calculates the concentration of sulfite.

[0018] Preferably, the data processing unit includes a high-performance embedded computer and a wireless communication module. The detector is provided with a high-performance embedded computer, and a wireless communication module is mounted on the high-performance embedded computer.

[0019] By adopting the above technical solutions, the high-performance embedded computer has powerful data processing capabilities and storage functions, can process and analyze the received data, output the final measurement results, and the wireless communication module can transmit the data to the remote monitoring platform.

[0020] Preferably, the automatic mechanism includes a base, a cup body, a transport pipeline, a support frame, and a drive mechanism. A set of cup bodies is provided at the middle top end of the base. A set of transport pipelines is provided at the left top end of the cup body. The other end of the transport pipeline is connected to a heating device. A set of support frames is connected to the right top end of the base. The top end of the support frame is connected to a drive mechanism, and the drive mechanism is connected to the outer top end of the fiber optic probe.

[0021] By adopting the above technical solution, the transport pipeline can transport the processed sample into the cup body, and the drive mechanism drives the fiber optic probe to flip to measure the sample.

[0022] Preferably, the drive mechanism includes a top end mechanism, a linkage mechanism, and a cleaning mechanism. The top end of the support frame is connected to the bottom end of the top end mechanism. The left end of the top end mechanism is provided with a linkage mechanism, and the bottom end of the linkage mechanism is connected to a cleaning mechanism.

[0023] By adopting the above technical solution, the top end mechanism can drive the fiber optic probe to move left and right, the linkage mechanism flips the fiber optic probe, and the cleaning mechanism can flip the end of the fiber optic probe.

[0024] Preferably, the top end mechanism includes a top cylinder, a notch, a moving groove, a moving block, a moving wheel, a motor, a connecting frame, and a connecting rod. The top end of the support frame is connected to the bottom end of the top cylinder. A notch is provided at the left top end of the top cylinder. A moving groove is provided at the middle bottom end inside the top cylinder. A moving block is provided in the moving groove. The left bottom end of the moving block is connected to a moving wheel, and the right bottom end is connected to a motor. The drive shaft of the motor is connected to the middle rear end of the moving wheel through a belt. A set of connecting frames is provided at the front and middle of the left side of the top cylinder, and a set of connecting rods is connected to the bottom ends of the opposite faces of the two sets of connecting frames.

[0025] By adopting the above technical solution, the motor can drive the moving wheel and the moving block to drive the fiber optic probe to move left and right along the moving groove.

[0026] Preferably, the linkage mechanism includes a bottom cabin, an electric push rod, a sliding kit, a rack, a connecting block one, a flipping sleeve, a gear, a connecting block two, and a fixing rod. A set of bottom cabins is provided at the left bottom end of the top cylinder. A set of electric push rods is provided inside the bottom cabin. The output end of the electric push rod extends through the left end of the bottom cabin and is connected to a set of sliding kits. A set of racks is provided at the front and bottom of the left side of the sliding kit. A set of flipping sleeves is connected to the middle outside of the connecting rod through a connecting block one. A set of gears is provided at the front and rear ends of the connecting block one. The right bottom end of the flipping sleeve is connected to a set of fixing rods through a connecting block two.

[0027] By adopting the above technical solution, the electric push rod can push the sliding kit and the rack to move, and the gear drives the flipping sleeve and the fiber optic probe placed therein to flip, realizing the measurement of the sample.

[0028] Preferably, the cleaning mechanism includes a connecting sleeve housing, a third connecting block, a collar and a scraper. The right middle end of the connecting sleeve housing is connected to the bottom end of the fixed rod through the third connecting block. At least two groups of collars are equidistantly arranged on the left side of the connecting sleeve housing, and scrapers are connected to the inner sides of the collars.

[0029] By adopting the above technical solution, when the optical fiber probe is reset, the end passes through the scraper in the collar, and the sample adhered to the outside thereof can be scraped off, avoiding the attachment of sample pollutants to the optical fiber probe, which affects the normal use of the optical fiber probe and the accuracy of the measurement.

[0030] The present application provides a method for determining sulfite in the slurry of a desulfurization tower, including the following steps:

[0031] S1. The automatic valve is opened, and the slurry sample on the outlet pipeline of the desulfurization tower is collected through the sampling pipeline.

[0032] S2. The sampling pipeline sends the collected slurry sample into the filter for filtration, and performs dilution and heating treatments through a dilution pump and a heating device.

[0033] S3. The transportation pipeline sends the treated slurry sample into the cup body.

[0034] S4. The motor drives the moving wheel to drive the optical fiber probe to move into the flipping sleeve.

[0035] S5. The electric push rod pushes the sliding sleeve and the rack to drive the flipping sleeve and the optical fiber probe to flip.

[0036] S6. The optical fiber probe is inserted into the cup body, and by emitting a light source with a specific wavelength and receiving the reflected light signal, the concentration of sulfite is calculated.

[0037] S7. The high-performance embedded computer processes and analyzes the received data, outputs the final measurement result, and transmits the data to the monitoring center through the wireless communication module.

[0038] S8. The electric push rod retracts its output end to drive the sliding sleeve, the flipping sleeve and the optical fiber probe to reset.

[0039] S9. The motor drives the moving wheel to move, driving the optical fiber probe to exit the flipping sleeve and reset, and performing cleaning and maintenance through the scraper to complete the measurement operation.

[0040] In summary, the present application includes at least one of the following beneficial technical effects:

[0041] 1. The sampling unit includes an automatic valve and a sampling pipeline. The automatic valve is made of corrosion-resistant stainless steel, has good sealing performance, and can work stably in high-temperature and high-pressure environments. The sampling pipeline is made of acid- and alkali-resistant materials, has a smooth inner wall, and is not easy to adsorb impurities, ensuring the purity of the sample during transportation.

[0042] 2. The pretreatment unit includes a filter, a dilution pump, and a heating device. The filter is a microporous ceramic filter with a pore diameter less than 5 μm, which can effectively remove suspended solids and impurities. The dilution pump is used to adjust the concentration of the sample to meet the requirements of optical detection. The heating device uses a PTC heating element, which has a fast heating rate and high temperature control accuracy.

[0043] 3. The optical detection unit includes an optical fiber probe, an automatic mechanism, and a detector. The optical fiber probe is a multimode optical fiber with strong anti-interference ability and long transmission distance. The end of the optical fiber probe is coated with an anti-pollution coating to reduce the adhesion of pollutants to its surface. The automatic mechanism is connected to the outer end of the optical fiber probe and can drive it to perform flipping activities. The detector uses a photoelectric converter to convert the received reflected light signal into an electrical signal.

[0044] 4. The data processing unit includes a high-performance embedded computer and a wireless communication module. The high-performance embedded computer is built-in with special software and has powerful data processing capabilities and storage functions. The wireless communication module is used to transmit data to a remote monitoring platform and supports multiple communication methods.

[0045] 5. The automatic mechanism includes a base, a cup body, a transportation pipeline, a support frame, and a driving mechanism. The driving mechanism includes a top mechanism, a linkage mechanism, and a cleaning mechanism, which can realize the automatic pushing, flipping, and resetting of the optical fiber probe, with strong flexibility, high automation, and more convenient and fast use. Description of the Drawings

[0046] Figure 1 is a schematic diagram of the working principle flow of this application;

[0047] Figure 2 is a schematic diagram of the overall structure of this application;

[0048] Figure 3 is a schematic diagram of the overall structure of the automatic mechanism of this application;

[0049] Figure 4 is a schematic diagram of the structure of the top mechanism of this application;

[0050] Figure 5 is a schematic diagram of the internal structure of the top mechanism of this application;

[0051] Figure 6 is a schematic diagram of the structure of the linkage mechanism of this application;

[0052] Figure 7It is a schematic diagram of the sliding kit structure of this application;

[0053] Figure 8 It is a schematic diagram of the cleaning mechanism structure of this application;

[0054] Description of reference numerals: 1. Desulfurization tower outlet pipe; 2. Sampling unit; 3. Pretreatment unit; 4. Optical detection unit; 5. Data processing unit; 21. Automatic valve; 22. Sampling pipeline; 31. Filter; 32. Dilution pump; 33. Heating device; 41. Optical fiber probe; 42. Automatic mechanism; 43. Detector; 51. High-performance embedded computer; 52. Wireless communication module; 421. Base; 422. Cup body; 423. Transport pipeline; 424. Support frame; 425. Driving mechanism; 4251. Top mechanism; 4252. Linkage mechanism; 4253. Cleaning mechanism; 42511. Top cylinder; 42512. Notch; 42513. Moving groove; 42514. Moving block; 42515. Moving wheel; 42516. Motor; 42517. Connecting frame; 42518. Connecting rod; 42521. Bottom cabin; 42522. Electric push rod; 42523. Sliding kit; 42524. Rack; 42525. Connecting block one; 42526. Flipping sleeve; 42527. Gear; 42528. Connecting block two; 42529. Fixed rod; 42531. Connecting sleeve housing; 42532. Connecting block three; 42533. Collar; 42534. Scraper. Detailed implementation manners

[0055] The following combines the attached Figure 1 - attached Figure 8 to further elaborate on this application in detail.

[0056] A system for determining sulfite in the slurry of a desulfurization tower, referring to Figure 1 - Figure 2 , includes a desulfurization tower outlet pipe 1 and a sampling unit 2 connected to the desulfurization tower outlet pipe 1 for regular sampling. The other end of the sampling unit 2 is connected to a pretreatment unit 3 that can preprocess the sample, and the other end of the pretreatment unit 3 is provided with an optical detection unit 4 that can measure the sample, and the optical detection unit 4 is connected to a data processing unit 5 that can perform data processing and transmission.

[0057] Specifically, the desulfurization tower outlet pipe 1 is sampled by the sampling unit 2, the sample is preprocessed by the pretreatment unit 3, the sample is measured and detected by the optical detection unit 4, and the sample data is processed by the data processing unit 5.

[0058] Referring to Figure 2 , the sampling unit 2 includes an automatic valve 21 and a sampling pipeline 22. One end of the sampling pipeline 22 is flange-connected to the desulfurization tower outlet pipe 1 through the automatic valve 21, which is beneficial for sampling.

[0059] Among them, the automatic valve 21 is made of corrosion-resistant stainless steel, has good sealing performance, and can work stably in high-temperature and high-pressure environments. The sampling pipeline 22 is made of acid- and alkali-resistant materials, has a smooth inner wall, is not easy to adsorb impurities, and ensures the purity of the sample during transportation.

[0060] The pretreatment unit 3 includes a filter 31, a dilution pump 32, and a heating device 33. One end of the sampling pipeline 22 far from the automatic valve 21 is fixedly connected to the filter 31. The sample can be filtered through the filter 31. The bottom end of the filter 31 is fixedly connected to a heating device 33 for pretreating the sample. A dilution pump 32 is installed between the filter 31 and the heating device 33 to dilute the sample and adjust the concentration of the sample to meet the requirements of optical detection.

[0061] Among them, the filter 31 is a microporous ceramic filter with a pore diameter less than 5μm, which can effectively remove suspended solids and impurities in the sample. The heating device 33 uses a PTC heating element, which has a fast heating rate and high temperature control accuracy.

[0062] The optical detection unit 4 includes an optical fiber probe 41, an automatic mechanism 42, and a detector 43. The outer top end of the optical fiber probe 41 is connected to the automatic mechanism 42. The automatic mechanism 42 can drive the optical fiber probe 41 to perform automatic flipping activities to detect the sample. The top end of the optical fiber probe 41 is connected to the detector 43 through a wire, and the detector 43 can process the received information.

[0063] Among them, the optical fiber probe 41 is a multimode optical fiber with strong anti-interference ability and long transmission distance. The end of the optical fiber probe 41 is coated with an anti-pollution coating to reduce the attachment of pollutants to the surface of the optical fiber probe 41. The detector 43 uses a photoelectric converter to convert the received reflected light signal into an electrical signal for easy processing.

[0064] The data processing unit 5 includes a high-performance embedded computer 51 and a wireless communication module 52. The high-performance embedded computer 51 is provided inside the detector 43, and the wireless communication module 52 is mounted on the high-performance embedded computer 51.

[0065] Among them, the high-performance embedded computer 51 has a dedicated software built-in, has powerful data processing capabilities and storage functions. The wireless communication module 52 can transmit data to a remote monitoring platform and supports multiple communication methods.

[0066] Specifically, through the coordinated action of the sampling unit 2, the pretreatment unit 3, the optical detection unit 4, and the data processing unit 5, the real-time on-line monitoring of sulfite in the desulfurization tower slurry is realized. The sampling unit 2 regularly collects slurry samples through the automatic valve 21, ensuring the freshness and representativeness of the samples. The pretreatment unit 3 filters, dilutes, and heats the samples, eliminating the influence of impurities and temperature fluctuations, and improving the accuracy and stability of the detection. The optical detection unit 4 uses an optical fiber probe 41 and an automatic mechanism 42 to perform automated non-contact measurement, avoiding the complex operation and human error existing in the traditional method. The data processing unit 5 intelligently analyzes and processes the collected data, outputs the final measurement result, and realizes remote monitoring through the wireless communication module 52.

[0067] Referring to Figure 2 - Figure 3 , the automatic mechanism 42 includes a base 421, a cup body 422, a transport pipeline 423, a support frame 424, and a driving mechanism 425. A set of cup bodies 422 for placing samples are placed at the middle top end of the base 421. A set of transport pipelines 423 are in contact with the left top end of the cup body 422. The other end of the transport pipeline 423 is communicated with the heating device 33 to transport the samples. A set of support frames 424 are welded to the right top end of the base 421. The top end of the support frame 424 is fixedly connected to the driving mechanism 425. The driving mechanism 425 is connected to the outer top end of the optical fiber probe 41.

[0068] Specifically, the transport pipeline 423 can transport the processed samples into the cup body 422, and the driving mechanism 425 drives the optical fiber probe 41 to flip to measure the samples.

[0069] Referring to Figure 3 - Figure 4 , the driving mechanism 425 includes a top end mechanism 4251, a linkage mechanism 4252, and a cleaning mechanism 4253. The top end of the support frame 424 is fixedly connected to the bottom end of the top end mechanism 4251. The left end of the top end mechanism 4251 is provided with the linkage mechanism 4252. The cleaning mechanism 4253 is installed at the bottom end of the linkage mechanism 4252.

[0070] Specifically, the top end mechanism 4251 can drive the optical fiber probe 41 to move left and right, the linkage mechanism 4252 flips the optical fiber probe 41, and the cleaning mechanism 4253 can flip the end of the optical fiber probe 41.

[0071] Referring to Figure 4 - Figure 5, the top mechanism 4251 includes a top cylinder 42511, a notch 42512, a moving groove 42513, a moving block 42514, a moving wheel 42515, a motor 42516, a connecting frame 42517 and a connecting rod 42518. The top end of the support frame 424 is fixedly connected to the bottom end of the top cylinder 42511. A notch 42512 is formed at the left top end of the top cylinder 42511. When the optical fiber probe 41 flips, its top end can pass through the notch 42512 to avoid bumping against the top cylinder 42511. A moving groove 42513 is formed at the middle of the inner bottom of the top cylinder 42511. A moving block 42514 is slidably connected in the moving groove 42513. A moving wheel 42515 is rotatably connected to the left bottom end of the moving block 42514. A set of motors 42516 is installed at the right bottom end. The driving shaft of the motor 42516 is connected to the middle rear end of the moving wheel 42515 through a belt. When the driving shaft of the motor 42516 rotates, it can drive the moving wheel 42515 to rotate, and then drive the moving block 42514 to move in the moving groove 42513. Among them, a "U"-shaped groove corresponding to the top end of the optical fiber probe 41 is provided at the top end of the moving block 42514, which can clamp and fix the optical fiber probe 41. A set of auxiliary rollers is installed at the middle of the right bottom of the moving block 42514, which can improve the stability of the moving block 42514 when it moves. A set of inverted "L"-shaped connecting frames 42517 are fixedly connected to the middle of the front and rear sides on the left side of the top cylinder 42511. A set of connecting rods 42518 are fixedly connected to the bottom ends of the opposite surfaces of the two connecting frames 42517.

[0072] Specifically, the motor 42516 can be driven to rotate the moving wheel 42515, driving the moving block 42514 and the optical fiber probe 41 to move left and right along the moving groove 42513.

[0073] Refer to Figure 4 , Figure 6 and Figure 7, the linkage mechanism 4252 includes a bottom cabin 42521, an electric push rod 42522, a sliding sleeve 42523, a rack 42524, a connecting block one 42525, a flipping sleeve 42526, a gear 42527, a connecting block two 42528 and a fixed rod 42529. A group of bottom cabins 42521 are fixedly connected to the bottom left end of the top cylinder 42511. A group of electric push rods 42522 are installed in the bottom cabin 42521. The left end of the output end of the electric push rod 42522 penetrates and extends to the left end of the bottom cabin 42521 and is fixedly connected to a group of "U"-shaped sliding sleeves 42523. The front and rear ends of the top of the sliding sleeve 42523 extend to the front and rear surfaces of the top cylinder 42511, and chutes are provided on the front and rear surfaces of the top cylinder 42511. Sliders corresponding to the chutes are fixedly connected to the front and rear surfaces in the sliding sleeve 42523, which can improve the stability of the sliding sleeve 42523 during movement. A group of racks 42524 are fixedly connected to the front, rear, and bottom ends on the left side of the sliding sleeve 42523. The middle outer end of the connecting rod 42518 is connected to a group of flipping sleeves 42526 through the connecting block one 42525. The flipping sleeve 42526 can be flipped around the connecting rod 42518 through the connecting block one 42525, and a group of gears 42527 are fixedly connected to the front and rear ends of the connecting block one 42525. The gears 42527 are semi-gears and can be meshed with the racks 42524. When the racks 42524 move left and right, the flipping sleeve 42526 can be driven to rotate and flip through the gears 42527. A group of fixed rods 42529 are fixedly connected to the right bottom end of the flipping sleeve 42526 through the connecting block two 42528.

[0074] Specifically, the electric push rod 42522 can push the sliding sleeve 42523 and the rack 42524 to move left and right, and drive the flipping sleeve 42526 and the optical fiber probe 41 placed therein to flip through the gear 42527, so that the optical fiber probe 41 can be inserted into the cup body 422 to realize the determination of the sample.

[0075] Refer to Figure 4 And Figure 8 , the cleaning mechanism 4253 includes a connecting sleeve housing 42531, a connecting block three 42532, a collar 42533 and a scraper 42534. The connecting sleeve housing 42531 is semi-circular and has a through port on its outer side, which can improve the aesthetics and reduce the self-weight. The right middle end of the connecting sleeve housing 42531 is fixedly connected to the bottom end of the fixed rod 42529 through the connecting block three 42532. Not less than two groups of collars 42533 are equidistantly installed on the left side of the connecting sleeve housing 42531. Scrapers 42534 are fixedly connected to the inner sides of the collars 42533. The scrapers 42534 are made of rubber and can contact the outer side of the optical fiber probe 41.

[0076] Specifically, when the fiber optic probe 41 is reset, the end passes through the scraper 42534 inside the collar 42533, and the sample adhered to the outside can be scraped off, avoiding the attachment of sample contaminants to the fiber optic probe 41 and affecting the normal use of the fiber optic probe 41 and the accuracy of the measurement.

[0077] The present application provides a method for determining sulfite in the slurry of a desulfurization tower, including the following steps:

[0078] S1. The automatic valve 21 is opened, and the slurry sample on the outlet pipe 1 of the desulfurization tower is collected through the sampling pipeline 22;

[0079] S2. The sampling pipeline 22 sends the collected slurry sample into the filter 31 for filtration, and performs dilution and heating treatments through the dilution pump 32 and the heating device 33;

[0080] S3. The transportation pipeline 423 sends the processed slurry sample into the cup body 422;

[0081] S4. The motor 42516 drives the moving wheel 42515 to drive the fiber optic probe 41 to move into the flipping sleeve 42526;

[0082] S5. The electric push rod 42522 pushes the sliding sleeve 42523 and the rack 42524 to drive the flipping sleeve 42526 and the fiber optic probe 41 to flip;

[0083] S6. The fiber optic probe 41 is inserted into the cup body 422, and by emitting a light source with a specific wavelength and receiving the reflected light signal, the concentration of sulfite is calculated;

[0084] S7. The high-performance embedded computer 51 processes and analyzes the received data, outputs the final measurement result, and transmits the data to the monitoring center through the wireless communication module 52;

[0085] S8. The electric push rod 42522 retracts its output end to drive the sliding sleeve 42523, the flipping sleeve 42526, and the fiber optic probe 41 to reset;

[0086] S9. The motor 42516 drives the moving wheel 42515 to move, driving the fiber optic probe 41 to exit the flipping sleeve 42526 and reset, and performing cleaning and maintenance through the scraper 42534 to complete the measurement operation.

[0087] The present application provides a method and system for determining sulfite in the slurry of a desulfurization tower. The sampling unit 2 includes an automatic valve 21 and a sampling pipeline 22. The automatic valve 21 is made of corrosion-resistant stainless steel, has good sealing performance, and can work stably in high-temperature and high-pressure environments. The sampling pipeline 22 is made of acid- and alkali-resistant materials, has a smooth inner wall, is not easy to adsorb impurities, and ensures the purity of the sample during transportation. The pretreatment unit 3 includes a filter 31, a dilution pump 32, and a heating device 33. The filter 31 is a microporous ceramic filter with a pore diameter less than 5 μm, which can effectively remove suspended solids and impurities. The dilution pump 32 is used to adjust the concentration of the sample to meet the requirements of optical detection. The heating device 33 uses a PTC heating element, which has a fast heating rate and high temperature control accuracy. The optical detection unit 4 includes an optical fiber probe 41, an automatic mechanism 42, and a detector 43. The optical fiber probe 41 is a multimode optical fiber, which has strong anti-interference ability and long transmission distance. The end of the optical fiber probe is coated with an anti-pollution coating to reduce the attachment of pollutants to its surface. The automatic mechanism 42 is connected to the outer end of the optical fiber probe 41 and can drive it to perform flipping activities. The detector 43 uses a photoelectric converter to convert the received reflected light signal into an electrical signal. The data processing unit 5 includes a high-performance embedded computer 51 and a wireless communication module 52. The high-performance embedded computer 51 has a dedicated software built-in, has powerful data processing capabilities and storage functions. The wireless communication module 52 is used to transmit data to a remote monitoring platform and supports multiple communication methods. The automatic mechanism 42 includes a base 421, a cup body 422, a transportation pipeline 423, a support frame 424, and a driving mechanism 425. The driving mechanism 425 includes a top mechanism 4251, a linkage mechanism 4252, and a cleaning mechanism 4253, which can realize the automatic pushing, flipping, and resetting of the optical fiber probe 41, with strong flexibility, high automation, and more convenient and fast use.

[0088] The present application relates to a method and system for determining sulfite in the slurry of a desulfurization tower, belonging to the technical field of sulfite determination. It includes a desulfurization tower outlet pipeline, a sampling unit, a pretreatment unit, an optical detection unit, and a data processing unit. The present application has the effect of determining sulfite. The optical detection unit includes components such as an optical fiber probe, an automatic mechanism, and a detector. The automatic mechanism can drive the optical fiber probe to perform flipping activities, so that its end can measure the sample, improving the measurement accuracy. The automatic mechanism includes components such as a base, a cup body, a transportation pipeline, a support frame, and a driving mechanism, which can realize the automatic pushing and flipping of the optical fiber probe, with a high degree of automation, effectively improving the flexibility during use, simplifying the operation process, reducing the steps of manual participation, and being suitable for large-scale popularization and use.

[0089] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A system for determining sulfite in the slurry of a desulfurization tower, characterized in that, It includes the desulfurization tower outlet pipe (1) and a sampling unit (2) connected to the desulfurization tower outlet pipe (1). The other end of the sampling unit (2) is connected to a pretreatment unit (3). The other end of the pretreatment unit (3) is provided with an optical detection unit (4). The optical detection unit (4) is connected to a data processing unit (5); The sampling unit (2) includes an automatic valve (21) and a sampling pipeline (22). One end of the sampling pipeline (22) is connected to the desulfurization tower outlet pipe (1) through the automatic valve (21); The pretreatment unit (3) includes a filter (31), a dilution pump (32) and a heating device (33). The end of the sampling pipeline (22) far from the automatic valve (21) is connected to the filter (31). The bottom end of the filter (31) is provided with a heating device (33), and a dilution pump (32) is arranged between the filter (31) and the heating device (33); The optical detection unit (4) includes an optical fiber probe (41), an automatic mechanism (42) and a detector (43). The outer top end of the optical fiber probe (41) is connected to the automatic mechanism (42), and a detector (43) is arranged at the top end; The data processing unit (5) includes a high-performance embedded computer (51) and a wireless communication module (52). A high-performance embedded computer (51) is arranged in the detector (43), and a wireless communication module (52) is mounted on the high-performance embedded computer (51); The automatic mechanism (42) includes a base (421), a cup body (422), a transport pipeline (423), a support frame (424) and a driving mechanism (425). A group of cup bodies (422) are arranged at the middle top end of the base (421). A group of transport pipelines (423) are arranged at the left top end of the cup body (422). The other end of the transport pipeline (423) is connected to the heating device (33). A group of support frames (424) are connected to the right top end of the base (421). The top end of the support frame (424) is connected to the driving mechanism (425). The driving mechanism (425) is connected to the outer top end of the optical fiber probe (41); The driving mechanism (425) includes a top-end mechanism (4251), a linkage mechanism (4252) and a cleaning mechanism (4253). The top end of the support frame (424) is connected to the bottom end of the top-end mechanism (4251). The left end of the top-end mechanism (4251) is provided with a linkage mechanism (4252). The bottom end of the linkage mechanism (4252) is connected to the cleaning mechanism (4253).

2. The sulfite determination system in the desulfurization tower slurry according to claim 1, wherein, The top mechanism (4251) includes a top cylinder (42511), a notch (42512), a moving groove (42513), a moving block (42514), a moving wheel (42515), a motor (42516), a connecting frame (42517) and a connecting rod (42518). The top end of the support frame (424) is connected to the bottom end of the top cylinder (42511). A notch (42512) is provided at the top left end of the top cylinder (42511). A moving groove (42513) is provided at the middle of the inner bottom of the top cylinder (42511). A moving block (42514) is provided in the moving groove (42513). A moving wheel (42515) is connected to the bottom left end of the moving block (42514), and a motor (42516) is connected to the bottom right end. The driving shaft of the motor (42516) is connected to the rear middle end of the moving wheel (42515) through a belt. A set of connecting frames (42517) are provided at the front and middle of the left side of the top cylinder (42511), and a set of connecting rods (42518) are connected to the bottom ends of the opposite surfaces of the two sets of connecting frames (42517).

3. The sulfite determination system in the desulfurization tower slurry according to claim 2, wherein, The linkage mechanism (4252) includes a bottom cabin (42521), an electric push rod (42522), a sliding sleeve (42523), a rack (42524), a connecting block one (42525), a flipping sleeve (42526), a gear (42527), a connecting block two (42528) and a fixed rod (42529). A set of bottom cabins (42521) are provided at the bottom left end of the top cylinder (42511). A set of electric push rods (42522) are provided in the bottom cabins (42521). The left end of the output end of the electric push rod (42522) penetrates and extends to the left end of the bottom cabin (42521) and is connected to a set of sliding sleeves (42523). A set of racks (42524) are provided at the front and bottom of the left side of the sliding sleeve (42523). A set of flipping sleeves (42526) are connected to the middle of the outer side of the connecting rod (42518) through a connecting block one (42525). A set of gears (42527) are provided at the front and rear ends of the connecting block one (42525). A set of fixed rods (42529) are connected to the bottom right end of the flipping sleeve (42526) through a connecting block two (42528).

4. The sulfite determination system in the desulfurization tower slurry according to claim 3, wherein, The cleaning mechanism (4253) includes a connecting sleeve housing (42531), a connecting block three (42532), a collar (42533) and a scraper (42534). The right middle end of the connecting sleeve housing (42531) is connected to the bottom end of the fixed rod (42529) through a connecting block three (42532). Not less than two sets of collars (42533) are equidistantly provided on the left side of the connecting sleeve housing (42531), and scrapers (42534) are connected to the inner sides of the collars (42533).

5. A method for determining sulfite in the slurry of a desulfurization tower, which is applied to a system for determining sulfite in the slurry of a desulfurization tower according to claim 4, and is characterized in that, It includes the following steps: S1. The automatic valve (21) is opened, and the slurry sample on the outlet pipeline (1) of the desulfurization tower is collected through the sampling pipeline (22). S2. The sampling pipeline (22) sends the collected slurry sample into the filter (31) for filtration, and performs dilution and heating treatments through the dilution pump (32) and the heating device (33); S3. The transport pipeline (423) sends the processed slurry sample into the cup body (422); S4. The motor (42516) drives the moving wheel (42515) to drive the optical fiber probe (41) to move into the flipping sleeve (42526); S5. The electric push rod (42522) pushes the sliding kit (42523) and the rack (42524) to drive the flipping sleeve (42526) and the optical fiber probe (41) to flip; S6. The optical fiber probe (41) is inserted into the cup body (422), emits a light source with a specific wavelength and receives the reflected light signal to calculate the concentration of sulfite; S7. The high-performance embedded computer (51) processes and analyzes the received data, outputs the final measurement result, and transmits the data to the monitoring center through the wireless communication module (52); S8. The electric push rod (42522) retracts its output end to drive the sliding kit (42523), the flipping sleeve (42526) and the optical fiber probe (41) to reset; S9. The motor (42516) drives the moving wheel (42515) to move, drives the optical fiber probe (41) to exit the flipping sleeve (42526) and reset, and performs cleaning and maintenance through the scraper (42534) to complete the measurement operation.

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