Method and system for determining sulfite in slurry of desulfurizing tower

Abstract

The invention relates to a method and system for determining sulfite in slurry of a desulfurizing tower, and relates to the technical field of sulfite determination, and the system comprises a desulfurizing tower outlet pipeline, a sampling unit, a preprocessing unit, an optical detection unit and a data processing unit. The device has the effect of measuring sulfite, the optical detection unit comprises an optical fiber probe, an automatic mechanism, a detector and other components, and the automatic mechanism can drive the optical fiber probe to turn over, so that the end part of the optical fiber probe can measure a sample, and the measurement accuracy is improved; the automatic mechanism comprises a base, a cup body, a conveying pipeline, a supporting frame, a driving mechanism and other assemblies, automatic pushing and overturning of the optical fiber probe can be achieved, the automation degree is high, using flexibility can be effectively improved, the operation process is simplified, manual participation steps are reduced, and the automatic mechanism is suitable for large-scale application and popularization.

Description

Technical Field

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

[0002] In industrial production, especially in coal-fired power plants, wet flue gas desulfurization technology is widely used to reduce sulfur dioxide emissions. One of the core equipment of this technology is the desulfurization tower, in which the slurry absorbs SO2 in the flue gas to generate calcium sulfite and a small amount of calcium sulfate. However, the presence of sulfite ions not only affects the operating efficiency of the entire system, but may also cause scaling, corrosion and other problems. Therefore, accurate determination of the sulfite content in the slurry is crucial to ensure the desulfurization effect. With the continuous improvement of environmental protection requirements, the real-time monitoring of the sulfite concentration in the desulfurization tower slurry is becoming increasingly urgent.

[0003] In order to solve similar problems, the prior art usually adopts a variety of methods to determine sulfite, and common methods include: Titration method: The sulfite concentration is determined by adding a standard solution for titration reaction. This method can obtain relatively accurate results, but the operation is cumbersome and time-consuming, and it is difficult to achieve online continuous monitoring.

[0004] Conductivity method: The sulfite concentration is indirectly estimated by measuring the change in the conductivity of the solution. This method is simple and fast, but it is less accurate because it is greatly affected by factors such as temperature and pH value.

[0005] Ultraviolet spectroscopy: Quantitative analysis is performed using the absorbance characteristics of sulfite at a specific wavelength. This non-contact measurement method has high accuracy, but the instrument is expensive and complex to maintain.

[0006] Chromatography: By separating and detecting the sulfite components in the sample, higher accuracy can be achieved, but the operation steps are complicated and not suitable for online monitoring.

[0007] Turbidimetric method: The concentration of sulfite is estimated by measuring the turbidity of the solution. It is simple and easy to use, but has low sensitivity and is easily affected by other suspended matter.

[0008] Although the above methods can meet the needs of sulfite determination under laboratory conditions to a certain extent, there are still obvious deficiencies in actual industrial applications. These methods are generally unable to achieve real-time online monitoring and are greatly affected by environmental factors, resulting in unstable results. In addition, most methods are complicated to operate and costly, making them inconvenient for large-scale promotion and application. These problems limit their scope of application and technical effects in actual industrial scenarios. Summary of the invention

[0009] The purpose of the present application is to provide a method and system for determining sulfite in desulfurization tower slurry to solve the problems raised in the above-mentioned background technology.

[0010] The present application provides a system for determining sulfite in desulfurization tower slurry, which adopts the following technical solution: comprising 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 preprocessing unit, the other end of the preprocessing unit is provided with an optical detection unit, and the optical detection unit is connected to a data processing unit; The sampling unit comprises an automatic valve and a sampling pipeline, and one end of the sampling pipeline is connected to the outlet pipeline of the desulfurization tower through the automatic valve.

[0011] By adopting the above technical solution, slurry samples on the outlet pipeline of the desulfurization tower can be regularly collected through the automatic valve, and transported to the pretreatment unit through the sampling pipeline for pretreatment.

[0012] Preferably, the pretreatment unit comprises a filter, a dilution pump and a heating device, the end of the sampling pipeline away from the automatic valve is connected to the filter, a heating device is provided at the bottom of the filter, and a dilution pump is provided between the filter and the heating device.

[0013] By adopting the above technical solution, the suspended matter and impurities in the sample can be effectively removed by the filter, the dilution pump can adjust the concentration of the sample to meet the requirements of optical detection, and the heating device heats the sample.

[0014] Preferably, the optical detection unit comprises a fiber optic probe, an automatic mechanism and a detector. The outer top end of the fiber optic probe is connected to the automatic mechanism, and the top end is provided with a detector.

[0015] By adopting the above technical solution, the optical fiber probe can be driven by an automatic mechanism. The optical fiber probe can emit a light source of a specific wavelength to the pretreated sample and receive a reflected light signal. The detector converts the received reflected light signal into an electrical signal and calculates the concentration of sulfite.

[0016] 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 the high-performance embedded computer is equipped with a wireless communication module.

[0017] By adopting the above technical solutions, the high-performance embedded computer has powerful data processing and storage capabilities, can process and analyze the received data, and output the final measurement results. The wireless communication module can transmit the data to the remote monitoring platform.

[0018] Preferably, the automatic mechanism includes a base, a cup body, a transport pipe, a support frame and a driving mechanism. A group of cup bodies are provided at the top middle end of the base, a group of transport pipes are provided at the top left end of the cup body, the other end of the transport pipe is connected to the heating device, a group of support frames are connected to the top right end of the base, the top of the support frame is connected to the driving mechanism, and the driving mechanism is connected to the outer top of the optical fiber probe.

[0019] By adopting the above technical solution, the transport pipeline can transport the processed sample into the cup body, and the driving mechanism drives the optical fiber probe to flip over to measure the sample.

[0020] Preferably, the driving mechanism includes a top mechanism, a linkage mechanism and a cleaning mechanism, the top end of the support frame is connected to the bottom end of the top mechanism, the left end of the top mechanism is provided with a linkage mechanism, and the bottom end of the linkage mechanism is connected to the cleaning mechanism.

[0021] By adopting the above technical solution, the top mechanism can drive the optical fiber probe to move left and right, the linkage mechanism can flip the optical fiber probe, and the cleaning mechanism can flip the end of the optical fiber probe.

[0022] Preferably, the top mechanism includes a top cylinder, a notch, a movable groove, a movable block, a movable wheel, a motor, a connecting frame and a connecting rod. The top of the support frame is connected to the bottom end of the top cylinder, a notch is provided at the top left end of the top cylinder, a movable groove is provided at the middle end of the bottom inner bottom of the top cylinder, a movable block is provided in the movable groove, the bottom left end of the movable block is connected to a movable wheel, and the bottom right end is connected to a motor, the motor driving shaft is connected to the rear middle end of the movable wheel through a belt, a group of connecting frames are provided at the front and rear middle ends of the left side of the top cylinder, and a group of connecting rods are connected to the bottom ends of the opposite surfaces of the two groups of connecting frames.

[0023] By adopting the above technical solution, the moving wheel and the moving block can be driven by the motor to move the optical fiber probe left and right along the moving groove.

[0024] Preferably, the linkage mechanism includes a bottom cabin, an electric push rod, a sliding kit, a rack, a connecting block 1, a flip sleeve, a gear, a connecting block 2 and a fixed rod. A bottom cabin is provided at the left end of the bottom of the top cylinder, and a group of electric push rods are provided in the bottom cabin. The left end of the output end of the electric push rod extends through and extends to the left end of the bottom cabin and is connected to a group of sliding kits. A group of racks are provided at the front and rear bottom ends of the left side of the sliding kit. The outer middle end of the connecting rod is connected to a group of flip sleeves through a connecting block 1. A group of gears are provided at the front and rear ends of the connecting block 1. The right bottom end of the flip sleeve is connected to a group of fixed rods through a connecting block 2.

[0025] 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 flip sleeve and the optical fiber probe placed therein to flip, thereby realizing the measurement of the sample.

[0026] Preferably, the cleaning mechanism includes a connecting sleeve, a connecting block three, a ring and a scraper. The right middle end of the connecting sleeve is connected to the bottom end of the fixed rod through the connecting block three. No less than two groups of rings are arranged at equal intervals on the left side of the connecting sleeve, and the inner sides of the rings are connected to scrapers.

[0027] By adopting the above technical solution, when the optical fiber probe is reset, the end passes through the scraper in the ring to scrape off the sample adhering to its outside, thereby avoiding the adhesion of sample contaminants to the optical fiber probe and affecting the normal use of the optical fiber probe and the accuracy of the measurement.

[0028] The present application provides a method for determining sulfite in desulfurization tower slurry, comprising the following steps: S1. The automatic valve is opened, and the slurry sample on the outlet pipe of the desulfurization tower is collected through the sampling pipeline; S2, the sampling pipeline sends the collected slurry sample into the filter for filtration, and dilutes and heats it through the dilution pump and the heating device; S3, the transport pipeline delivers the processed slurry sample into the cup body; S4, the motor drives the moving wheel to drive the optical fiber probe to move into the flip sleeve; S5, the electric push rod pushes the sliding kit and the rack to drive the flip sleeve and the optical fiber probe to flip; S6. Insert the optical fiber probe into the cup body, emit a light source of a specific wavelength and receive the reflected light signal to calculate the concentration of sulfite; S7, processing and analyzing the received data through a high-performance embedded computer, outputting the final measurement results, and transmitting the data to the monitoring center through a wireless communication module; S8, the electric push rod recycles the output end, driving the sliding kit, the flip sleeve and the optical fiber probe to reset; S9, the motor drives the moving wheel to move, driving the optical fiber probe to exit the flip sleeve and reset, and cleans and maintains it through the scraper to complete the measurement operation.

[0029] In summary, the present application includes at least one of the following beneficial technical effects: 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 under high temperature and high pressure environments. The sampling pipeline is made of acid- and alkali-resistant materials, with a smooth inner wall that is not easy to absorb impurities, ensuring the purity of the sample during transportation; 2. The pretreatment unit includes a filter, a dilution pump and a heating device. The filter is a microporous ceramic filter with a pore size of less than 5μm, which can effectively remove suspended matter 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 with a fast heating speed and high temperature control accuracy. 3. The optical detection unit includes a fiber optic probe, an automatic mechanism and a detector. The fiber optic probe uses multimode optical fiber, which has strong anti-interference ability and long transmission distance. The end of the fiber optic 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 fiber optic probe and can drive it to flip. The detector uses a photoelectric converter to convert the received reflected light signal into an electrical signal. 4. The data processing unit includes a high-performance embedded computer and a wireless communication module. The high-performance embedded computer has built-in dedicated software and has powerful data processing and storage capabilities. The wireless communication module is used to transmit data to the remote monitoring platform and supports multiple communication methods; 5. The automatic mechanism includes a base, a cup body, a transport pipe, a support frame and a driving mechanism. The driving mechanism includes a top mechanism, a linkage mechanism and a cleaning mechanism, which can realize automatic pushing, flipping and resetting of the optical fiber probe. It has strong flexibility, high degree of automation, and is more convenient and quick to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the working principle of this application; Figure 2 It is a schematic diagram of the overall structure of this application; Figure 3 It is a schematic diagram of the overall structure of the automatic mechanism of this application; Figure 4 It is a schematic diagram of the top mechanism structure of this application; Figure 5 It is a schematic diagram of the internal structure of the top mechanism of this application; Figure 6 It is a schematic diagram of the linkage mechanism structure of this application; Figure 7 It is a schematic diagram of the structure of the sliding kit of this application; Figure 8 It is a schematic diagram of the cleaning mechanism structure of this application; Description of reference numerals: 1. outlet pipe of desulfurization tower; 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; 42 511, 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, flip sleeve; 42527, gear; 42528, connecting block two; 42529, fixing rod; 42531, connecting sleeve; 42532, connecting block three; 42533, collar; 42534, scraper. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 -Attached Figure 8 , further details of this application are given.

[0032] A sulfite determination system in desulfurization tower slurry, referring to Figure 1-Figure 2 , including a desulfurization tower outlet pipeline 1 and a sampling unit 2 connected to the desulfurization tower outlet pipeline 1 for regular sampling, the other end of the sampling unit 2 is connected to a pretreatment unit 3 for pretreatment of the sample, the other end of the pretreatment unit 3 is provided with an optical detection unit 4 for measuring the sample, and the optical detection unit 4 is connected to a data processing unit 5 for data processing and transmission.

[0033] Specifically, the desulfurization tower outlet pipeline 1 is sampled by the sampling unit 2 , the sample is pre-processed by the pre-processing 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 .

[0034] Reference 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 outlet pipeline 1 of the desulfurization tower through the automatic valve 21, which is convenient for sampling.

[0035] Among them, the automatic valve 21 is made of corrosion-resistant stainless steel, has good sealing performance, and can work stably under high temperature and high pressure environment. The sampling pipeline 22 is made of acid and alkali resistant material with a smooth inner wall, which is not easy to absorb impurities, ensuring the purity of the sample during transportation.

[0036] The pretreatment unit 3 includes a filter 31, a dilution pump 32 and a heating device 33. The end of the sampling pipeline 22 away from the automatic valve 21 is fixedly connected to the filter 31, and 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 pre-treating the sample, and a dilution pump 32 is installed between the filter 31 and the heating device 33 to dilute the sample and adjust the solubility of the sample to meet the requirements of optical detection.

[0037] The filter 31 is a microporous ceramic filter with a pore size of less than 5 μm, which can effectively remove suspended matter and impurities in the sample. The heating device 33 is a PTC heating element with a fast heating speed and high temperature control accuracy.

[0038] The optical detection unit 4 includes a fiber optic probe 41, an automatic mechanism 42 and a detector 43. The outer top of the fiber optic probe 41 is connected to the automatic mechanism 42. The automatic mechanism 42 can drive the fiber optic probe 41 to automatically flip and detect the sample. The top of the fiber optic probe 41 is connected to the detector 43 through a line, which can process the received information.

[0039] Among them, the optical fiber probe 41 uses multi-mode optical fiber, which has strong anti-interference ability and long transmission distance, and the end of the optical fiber probe 41 is coated with an anti-pollution coating to reduce the adhesion of pollutants to the surface of the optical fiber probe 41. The detector 43 uses a photoelectric converter, which can convert the received reflected light signal into an electrical signal for easy processing.

[0040] The data processing unit 5 includes a high-performance embedded computer 51 and a wireless communication module 52 . The detector 43 is provided with the high-performance embedded computer 51 , and the high-performance embedded computer 51 is equipped with the wireless communication module 52 .

[0041] Among them, the high-performance embedded computer 51 has built-in dedicated software and has powerful data processing and storage functions. The wireless communication module 52 can transmit data to the remote monitoring platform and supports multiple communication methods.

[0042] Specifically, through the synergistic effect of the sampling unit 2, the pretreatment unit 3, the optical detection unit 4 and the data processing unit 5, real-time online monitoring of sulfite in the desulfurization tower slurry is achieved. The sampling unit 2 regularly collects slurry samples through the automatic valve 21 to ensure the freshness and representativeness of the samples. The pretreatment unit 3 filters, dilutes and heats the samples to eliminate the influence of impurities and temperature fluctuations, thereby improving the accuracy and stability of the detection. The optical detection unit 4 adopts an optical fiber probe 41 and an automatic mechanism 42 to perform automated non-contact measurement, thereby avoiding the complex operation and human errors in traditional methods. The data processing unit 5 intelligently analyzes and processes the collected data, outputs the final measurement results, and realizes remote monitoring through the wireless communication module 52.

[0043] Reference Figure 2-Figure 3 The automatic mechanism 42 includes a base 421, a cup body 422, a transport pipe 423, a support frame 424 and a driving mechanism 425. A group of cup bodies 422 for placing samples are placed at the top middle end of the base 421. A group of transport pipes 423 are provided at the top left end of the cup body 422. The other end of the transport pipe 423 is connected to the heating device 33 to transport samples. A group of support frames 424 are welded to the top right end of the base 421. The top of the support frame 424 is fixedly connected to the driving mechanism 425, and the driving mechanism 425 is connected to the outer top of the optical fiber probe 41.

[0044] Specifically, the transport pipe 423 can transport the processed sample into the cup body 422, and the driving mechanism 425 drives the optical fiber probe 41 to flip over to measure the sample.

[0045] Reference Figure 3-Figure 4 The driving mechanism 425 includes a top mechanism 4251, a linkage mechanism 4252 and a cleaning mechanism 4253. The top of the support frame 424 is fixedly connected to the bottom of the top mechanism 4251. The left end of the top mechanism 4251 is provided with a linkage mechanism 4252, and the bottom of the linkage mechanism 4252 is installed with a cleaning mechanism 4253.

[0046] Specifically, the top mechanism 4251 can drive the optical fiber probe 41 to move left and right, the linkage mechanism 4252 can flip the optical fiber probe 41, and the cleaning mechanism 4253 can flip the end of the optical fiber probe 41.

[0047] Reference Figure 4-Figure 5The 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 of the support frame 424 is fixedly connected to the bottom of the top cylinder 42511. A notch 42512 is provided at the top left end of the top cylinder 42511. When the optical fiber probe 41 is turned over, its top can pass through the notch 42512 to avoid collision with the top cylinder 42511. A moving groove 42513 is provided at the middle end of the inner bottom of the top cylinder 42511. A moving block 42514 is slidably connected in the moving groove 42513. The bottom left end of the moving block 42514 is rotatably connected to the moving wheel 42515. A group of electric motors are installed at the bottom right end. Machine 42516, the driving shaft of motor 42516 is connected to the rear middle end of moving wheel 42515 through a belt. The rotation of the driving shaft of motor 42516 can drive the moving wheel 42515 to rotate, and then drive the moving block 42514 to move in the moving groove 42513, wherein the top of the moving block 42514 is provided with a "U"-shaped groove corresponding to the top of the optical fiber probe 41, which can clamp and fix the optical fiber probe 41, and a group of auxiliary rollers are installed on the right bottom middle end of the moving block 42514 to improve the stability of the moving block 42514 when moving, and a group of inverted "L"-shaped connecting frames 42517 are fixedly connected to the front and rear middle ends of the left side of the top cylinder 42511, and a group of connecting rods 42518 are fixedly connected to the bottom ends of the opposite surfaces of the two groups of connecting frames 42517.

[0048] Specifically, the motor 42516 can drive the moving wheel 42515 to rotate, thereby driving the moving block 42514 and the optical fiber probe 41 to move left and right along the moving groove 42513.

[0049] Reference Figure 4 , Figure 6 and Figure 7The linkage mechanism 4252 includes a bottom cabin 42521, an electric push rod 42522, a sliding kit 42523, a rack 42524, a connecting block 1 42525, a flip sleeve 42526, a gear 42527, a connecting block 2 42528 and a fixing rod 42529. A group of bottom cabins 42521 is fixedly connected to the left end of the bottom 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 extends through and extends to the left end of the bottom cabin 42521, and is fixedly connected to a group of "U"-shaped sliding kits 42523. The front and rear ends of the sliding kit 42523 extend to the front and rear ends of the top cylinder 42511, and the front and rear ends of the top cylinder 42511 are provided with sliding grooves, and the front and rear ends of the sliding kit 42523 are fixedly connected with corresponding sliding grooves The slider can improve the stability of the sliding kit 42523 when it moves. The front and rear bottom ends of the left side of the sliding kit 42523 are fixedly connected with a group of racks 42524. The outer middle end of the connecting rod 42518 is connected with a group of flip sleeves 42526 through the connecting block 1 42525. The flip sleeve 42526 can be flipped around the connecting rod 42518 through the connecting block 1 42525, and the front and rear ends of the connecting block 1 42525 are fixedly connected with a group of gears 42527. The gear 42527 is a half gear and can be engaged with the rack 42524. When the rack 42524 moves left and right, the flip sleeve 42526 can be driven by the gear 42527 to rotate and flip. The right bottom end of the flip sleeve 42526 is fixedly connected with a group of fixed rods 42529 through the connecting block 2 42528.

[0050] Specifically, the electric push rod 42522 can push the sliding kit 42523 and the rack 42524 to move left and right, and the gear 42527 drives the flip sleeve 42526 and the optical fiber probe 41 placed therein to flip, so that the optical fiber probe 41 can be inserted into the cup body 422 to achieve the measurement of the sample.

[0051] Reference Figure 4 and Figure 8 The cleaning mechanism 4253 includes a connecting sleeve 42531, a connecting block three 42532, a ring 42533 and a scraper 42534. The connecting sleeve 42531 is semi-circular and has a through opening on its outer side to improve the aesthetics and reduce its dead weight. The right middle end of the connecting sleeve 42531 is fixedly connected to the bottom end of the fixing rod 42529 through the connecting block three 42532. No less than two groups of rings 42533 are installed at equal intervals on the left side of the connecting sleeve 42531. The inner side of the ring 42533 is fixedly connected with a scraper 42534. The scraper 42534 is made of rubber and can contact the outer side of the inverted optical fiber probe 41.

[0052] Specifically, when the fiber optic probe 41 is reset, the end passes through the scraper 42534 in the ring 42533 to scrape off the sample adhering to its outside, thereby preventing sample contaminants from adhering to the fiber optic probe 41 and affecting the normal use of the fiber optic probe 41 and the accuracy of the measurement.

[0053] The present application provides a method for determining sulfite in desulfurization tower slurry, comprising the following steps: 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 pipe 22; S2, the sampling pipeline 22 sends the collected slurry sample into the filter 31 for filtration, and dilutes and heats it through the dilution pump 32 and the heating device 33; S3, the transport pipeline 423 delivers 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 flip sleeve 42526; S5, the electric push rod 42522 pushes the sliding kit 42523 and the rack 42524, driving the flip sleeve 42526 and the optical fiber probe 41 to flip; S6, the optical fiber probe 41 is inserted into the cup body 422, and the concentration of sulfite is calculated by emitting a light source of a specific wavelength and receiving a reflected light signal; S7, processing and analyzing the received data through the high-performance embedded computer 51, outputting the final measurement results, and transmitting the data to the monitoring center through the wireless communication module 52; S8, the electric push rod 42522 retracts the output end, driving the sliding kit 42523, the flip sleeve 42526 and the optical fiber probe 41 to reset; S9, the motor 42516 drives the moving wheel 42515 to move, driving the optical fiber probe 41 to exit the flip sleeve 42526 and reset, and cleans and maintains it through the scraper 42534 to complete the measurement operation.

[0054] The present application provides a method and system for determining sulfite in desulfurization tower slurry. 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 under high temperature and high pressure environment. The sampling pipeline 22 is made of acid and alkali resistant materials, and the inner wall is smooth, which is not easy to adsorb impurities, thereby ensuring 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 size of less than 5μm, which can effectively remove suspended matter 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 is a PTC heating element with a fast heating speed and high temperature control accuracy. The optical detection unit 4 includes a fiber optic probe 41, an automatic mechanism 42 and a detector 43. The fiber optic probe 41 is made of multi-mode optical fiber, which has 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 adhesion 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 flip. The detector 43 adopts 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 built-in dedicated software and 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 transport 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 automatic pushing, flipping and resetting of the optical fiber probe 41, has strong flexibility, a high degree of automation, and is more convenient and quick to use.

[0055] The present application relates to a method and system for determining sulfite in desulfurization tower slurry, and to the technical field of sulfite determination, which 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, and 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 so that its end can measure the sample to improve the accuracy of the measurement. The automatic mechanism includes components such as a base, a cup body, a transport pipeline, a support frame, and a driving mechanism, which can realize automatic pushing and flipping of the optical fiber probe. The degree of automation is high, which can effectively improve the flexibility during use, simplify the operation process, and reduce the steps of manual participation, and is suitable for large-scale promotion and use.

[0056] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A system for determining sulfite in desulfurization tower slurry, characterized in that: It comprises a desulfurization tower outlet pipeline (1) and a sampling unit (2) connected to the desulfurization tower outlet pipeline (1), the other end of the sampling unit (2) is connected to a pre-processing unit (3), the other end of the pre-processing unit (3) is provided with an optical detection unit (4), and the optical detection unit (4) is connected to a data processing unit (5); The sampling unit (2) comprises an automatic valve (21) and a sampling pipeline (22), and one end of the sampling pipeline (22) is connected to the desulfurization tower outlet pipeline (1) via the automatic valve (21).

2. A system for determining sulfite in desulfurization tower slurry according to claim 1, characterized in that: The pretreatment unit (3) comprises a filter (31), a dilution pump (32) and a heating device (33); an end of the sampling pipeline (22) away from the automatic valve (21) is connected to the filter (31); a heating device (33) is provided at the bottom end of the filter (31); and a dilution pump (32) is provided between the filter (31) and the heating device (33).

3. The system for determining sulfite in desulfurization tower slurry according to claim 1, characterized in that: The optical detection unit (4) comprises 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 the top end is provided with a detector (43).

4. A system for determining sulfite in desulfurization tower slurry according to claim 3, characterized in that: The data processing unit (5) comprises a high-performance embedded computer (51) and a wireless communication module (52); the detector (43) is provided with a high-performance embedded computer (51); and the high-performance embedded computer (51) is equipped with a wireless communication module (52).

5. A system for determining sulfite in desulfurization tower slurry according to claim 3, characterized in that: The automatic mechanism (42) comprises a base (421), a cup body (422), a transport pipe (423), a support frame (424) and a driving mechanism (425); a group of cup bodies (422) are provided at the top middle end of the base (421); a group of transport pipes (423) are provided at the top left end of the cup body (422); the other end of the transport pipe (423) is connected to the heating device (33); a group of support frames (424) are connected at the top right end of the base (421); the top end of the support frame (424) is connected to the driving mechanism (425); and the driving mechanism (425) is connected to the outer top end of the optical fiber probe (41).

6. A system for determining sulfite in desulfurization tower slurry according to claim 5, characterized in that: The driving mechanism (425) comprises a top 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 mechanism (4251); the linkage mechanism (4252) is provided at the left end of the top mechanism (4251); and the bottom end of the linkage mechanism (4252) is connected to the cleaning mechanism (4253).

7. A system for determining sulfite in desulfurization tower slurry according to claim 6, characterized in that: The top mechanism (4251) comprises 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 of the support frame (424) is connected to the bottom of the top cylinder (42511); the top left end of the top cylinder (42511) is provided with a notch (42512); the middle end of the inner bottom of the top cylinder (42511) is provided with a moving groove (42513); ), a moving block (42514) is provided in the moving groove (42513), the bottom left end of the moving block (42514) is connected to a moving wheel (42515), and the bottom right end is connected to a motor (42516), the driving shaft of the motor (42516) is connected to the rear middle end of the moving wheel (42515) through a belt, and a group of connecting frames (42517) are provided at the front and rear middle ends of the left side of the top cylinder (42511), and the bottom ends of the opposite surfaces of the two groups of connecting frames (42517) are connected to a group of connecting rods (42518).

8. A system for measuring sulfite in desulfurization tower slurry according to claim 7, characterized in that: The linkage mechanism (4252) comprises a bottom cabin (42521), an electric push rod (42522), a sliding kit (42523), a rack (42524), a connecting block 1 (42525), a flip sleeve (42526), ​​a gear (42527), a connecting block 2 (42528) and a fixing rod (42529). A bottom cabin (42521) is provided at the left end of the bottom of the top cylinder (42511). A group of electric push rods (42522) are provided in the bottom cabin (42521). The output end of the electric push rod (42522) is connected to the left end of the bottom cabin (42521). The connecting rod (42518) extends to the left end of the bottom cabin (42521) and is connected to a set of sliding kits (42523). The left front and rear bottom ends of the sliding kit (42523) are both provided with a set of racks (42524). The outer middle end of the connecting rod (42518) is connected to a set of flip sleeves (42526) through a connecting block 1 (42525). The front and rear ends of the connecting block 1 (42525) are both provided with a set of gears (42527). The right bottom end of the flip sleeve (42526) is connected to a set of fixing rods (42529) through a connecting block 2 (42528).

9. A system for determining sulfite in desulfurization tower slurry according to claim 8, characterized in that: The cleaning mechanism (4253) comprises a connecting sleeve (42531), a connecting block three (42532), a collar (42533) and a scraper (42534); the right middle end of the connecting sleeve (42531) is connected to the bottom end of the fixing rod (42529) via the connecting block three (42532); at least two groups of collars (42533) are arranged at equal intervals on the left side of the connecting sleeve (42531); and the inner sides of the collars (42533) are all connected to scrapers (42534).

10. A method for determining sulfite in desulfurization tower slurry, according to any one of the systems for determining sulfite in desulfurization tower slurry according to claims 1-9, characterized in that: The steps include: S1, the automatic valve (21) is opened, and a 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 dilutes and heats it through the dilution pump (32) and the heating device (33); S3, the transport pipeline (423) delivers the processed slurry sample into the cup body (422); S4, the motor (42516) drives the moving wheel (42515), driving the optical fiber probe (41) to move into the flip sleeve (42526); S5, the electric push rod (42522) pushes the sliding kit (42523) and the rack (42524), driving the flip sleeve (42526) and the optical fiber probe (41) to flip; S6, inserting the optical fiber probe (41) into the cup body (422), emitting a light source of a specific wavelength and receiving a reflected light signal, thereby calculating the concentration of sulfite; S7, processing and analyzing the received data through a high-performance embedded computer (51), outputting the final measurement result, and transmitting the data to a monitoring center through a wireless communication module (52); S8, the electric push rod (42522) retracts the output end, driving the sliding kit (42523), the flip sleeve (42526) and the optical fiber probe (41) to reset; S9, the motor (42516) drives the moving wheel (42515) to move, driving the optical fiber probe (41) to exit the flip sleeve (42526) and reset, and cleans and maintains it through the scraper (42534), completing the measurement operation.

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