A fixed feeding system applied to a CFB desulfurization process

Abstract

This utility model discloses a fixed feeding system for CFB desulfurization processes, relating to the field of desulfurization technology. It includes a fixed feeding controller; an inlet CEMS for monitoring SO2 concentration in the inlet flue gas; and weighing meters for hydrated lime and quicklime silos for monitoring raw material consumption. Through an exponential function model and multi-parameter closed-loop control, the system achieves precise matching between the hydrated lime feeding amount and actual demand, significantly reducing overfeeding and lowering system operating costs. An emergency control module can quickly respond to SO2 exceeding standards at the outlet. Combined with real-time concentration monitoring, it ensures stable compliance with environmental emission requirements even during fluctuations in operating conditions. The entire process requires no manual intervention, reducing maintenance workload and human error. All system components use industrial standard equipment, allowing direct adaptation to upgrades of existing CFB desulfurization systems without altering the main structure of the desulfurization tower. This results in low application costs and improved performance of the fixed feeding system.

Description

Technical Field

[0001] This utility model belongs to the field of desulfurization technology, specifically a fixed feeding system applied to CFB desulfurization process. Background Technology

[0002] CFB stands for Circulating Fluidized Bed, a highly efficient and mature fluidized bed reaction technology widely used in energy, chemical, and environmental protection fields, especially playing a core role in combustion and flue gas purification (such as desulfurization and denitrification). Circulating fluidized bed desulfurization is one of the mainstream technologies for industrial flue gas desulfurization. Its principle is as follows: the flue gas to be treated enters from the bottom of the desulfurization tower, is accelerated by the Venturi tube at the bottom of the tower, and then enters the circulating fluidized bed. The desulfurizing agent (slaked lime) and the flue gas form intense turbulence and mixing in the bed through airflow, so that the SO2 in the flue gas reacts fully with the slaked lime to achieve the desulfurization effect.

[0003] In actual operation, the operating conditions of CFB desulfurization systems are easily affected by factors such as boiler load changes and fluctuations in the sulfur content of raw coal, leading to frequent fluctuations in the SO2 concentration of the inlet flue gas. In existing technologies, the control of hydrated lime feeding mainly relies on two methods: one is manual adjustment of the feeding valve opening based on the outlet SO2 concentration, which depends on the operator's experience and has a lag time (5-10 minutes), easily resulting in overfeeding or underfeeding; the other is control based on the linear relationship between the inlet SO2 concentration and the feeding amount through a simple proportional controller. However, the actual desulfurization reaction is affected by many factors such as flue gas flow rate and temperature, and the linear relationship cannot accurately match the actual needs, resulting in low feeding accuracy (deviation ≥20%). Both methods have the problems of waste due to overfeeding of raw materials and unstable outlet SO2 concentration, which leads to increased system operating costs, makes it difficult to meet environmental emission requirements, and fails to meet people's needs. Utility Model Content

[0004] The present invention aims to solve the technical problems existing in the prior art; to this end, the present invention proposes a fixed feeding system for CFB desulfurization process.

[0005] A fixed feed system for CFB desulfurization process includes: Fixed feeding controller, used for data processing, model calculation and instruction output; Inlet CEMS is used to monitor the SO2 concentration in the inlet flue gas; Weighing meters for hydrated lime silos and quicklime silos are used to monitor the consumption of raw materials; The screw feeder for slaked lime silos is used to control the amount of raw materials fed into the slaked lime silo. Export CEMS is used to monitor SO2 concentration in the exported flue gas. The fixed feeding controller receives data from each monitoring device and controls the operating frequency of the screw feeder in the quicklime silo through a built-in algorithm, thereby achieving intelligent control of raw material feeding.

[0006] As a further embodiment of this utility model: the slaked lime silo weighing meter is connected to the slaked lime silo, the quicklime silo weighing meter is connected to the quicklime silo, the slaked lime silo screw feeder is connected to the desulfurization tower, the inlet CEMS is set at the inlet flue gas pipe of the desulfurization tower, the outlet CEMS is set on the chimney, and the desulfurization tower is connected to the chimney through a booster fan.

[0007] As a further embodiment of this utility model, the fixed feeding controller has a built-in data fitting module, a real-time calculation module, and an emergency control module.

[0008] As a further aspect of this invention: the data fitting module, by inputting historical operating data, fits the relationship between the inlet SO2 concentration and the raw material consumption into an exponential function: y=a*b nx+m +c; Where x is the inlet SO2 concentration, in mg / Nm³. 3 ; y represents the raw material consumption, in kg / h; a, b, n, m, and c are the fitting parameters.

[0009] As a further aspect of this utility model: the real-time calculation module receives real-time SO2 concentration data from the inlet CEMS, substitutes it into the exponential function formula to calculate the theoretical feed rate, and converts it into the operating frequency command of the slaked lime silo screw feeder.

[0010] As a further aspect of this invention: the emergency control module detects an SO2 concentration ≥35 mg / Nm³ at the outlet CEMS. 3 When the duration is ≥3min, the operating frequency of the slaked lime silo screw feeder is increased by 10Hz every 30s until the SO2 concentration of the outlet CEMS shows a downward trend.

[0011] As a further aspect of this utility model, the real-time calculation module of the fixed feeding controller is also used to calculate the average value of the SO2 concentration data collected by the inlet CEMS, substitute the average value into the exponential function formula, obtain the theoretical total consumption of quicklime for the day, and further convert it into the theoretical feeding amount per hour.

[0012] As a further embodiment of this utility model: the fixed feeding controller also includes a consumption comparison module; The consumption comparison module receives weight data from the weighing scales of the slaked lime silo and the quicklime silo, calculates the actual total consumption of raw materials for the day, and compares it with the theoretical total consumption for the day obtained by the real-time calculation module. If the actual consumption deviates from the theoretical consumption by ≥10%, then adjust the operating frequency adjustment step of the slaked lime silo screw feeder.

[0013] As a further embodiment of this utility model: both the inlet CEMS and the outlet CEMS use CEMS probes to monitor the SO2 concentration in the flue gas, and both the inlet CEMS and the outlet CEMS include CEMS probe boxes; Both the inlet CEMS and the outlet CEMS are equipped with protective components to protect the CEMS probes.

[0014] As a further embodiment of this utility model: the protective component includes: a protective cover, a cleaning component, a rotating structure, and a cooling structure; The protective cover is installed on the outside of the CEMS probe and filters dust and impurities in the flue gas. The protective cover is uniformly provided with filter holes. The cleaning component is movably disposed on the outside of the protective cover to clean the dust and impurities adhering to the protective cover. The cleaning component includes a first cleaning strip symmetrically disposed on the protective cover and a second cleaning strip disposed at the end of the protective cover away from the CEMS probe box. The inner side of the first cleaning strip is an arc-shaped surface that fits against the outer wall of the protective cover. The first cleaning strip and the second cleaning strip are provided with a connected cooling cavity. The two rotating structures are respectively installed inside the inlet CEMS and the outlet CEMS. The rotating structures are installed inside the CEMS probe box and control the cleaning component to rotate on the protective cover. The cooling structures are respectively installed inside the inlet CEMS and the outlet CEMS, and the flue gas entering the protective cover is cooled by cleaning components.

[0015] As a further embodiment of this utility model: the cooling structure includes a cooling base and a liquid storage tank; The cooling seat is connected to the cleaning component, and the cooling seat is provided with a cooling pipe that communicates with the cooling chamber. The cooling seat is rotatably mounted on the outside of the protective cover. The liquid storage tank is connected to the cooling base through a liquid guiding ring. The liquid guiding ring is equipped with a waterproof pump that controls the circulation of the coolant in the liquid storage tank in the cooling base and the cleaning component. The liquid storage tank is located on the inner bottom surface of the CEMS probe box, the liquid guiding ring is located on the outer wall of the cooling seat, both the liquid guiding ring and the cooling seat are circular ring structures, the liquid storage tank has through holes that match the liquid guiding ring, and the liquid storage tank has symmetrical sealing rings that fit with the liquid guiding ring. The liquid guiding ring is movably disposed inside the liquid storage tank. The waterproof pump can draw the coolant from the liquid storage tank into the cooling seat and then into the cleaning component, so that the cleaning component cools the protective cover and the gas near the protective cover.

[0016] As a further embodiment of this utility model: a cooling box is provided on the lower end face of the CEMS probe box, and a cooling pump is symmetrically provided inside the CEMS probe box to connect the cooling box and the storage tank. The cooling box is provided with a refrigeration device for cooling the coolant. This allows the cooling pump to introduce the high-temperature coolant in the storage tank into the cooling box for cooling, and to introduce the low-temperature coolant in the cooling box into the storage tank.

[0017] As a further embodiment of this utility model: the rotating structure includes a rotating gear ring vertically disposed on the outside of the cooling seat and a rotating gear for controlling the rotation of the rotating gear ring; The CEMS probe box has a mounting bracket on its inner top surface that is rotatably connected to the rotating gear, and a drive motor for controlling the rotation of the rotating gear is provided on the other side of the mounting bracket. Both the rotating gear ring and the rotating gear are offset from the cooling seat.

[0018] As a further embodiment of this utility model: the outer wall of the cooling seat is provided with a plurality of rotating limiting members in a circular array, the CEMS probe box is provided with a rotating support seat that is rotatably connected to the rotating limiting members, the rotating support seat is provided with a rotating groove for rotating the rotating limiting members, and the rotating support seat is provided with an insertion slot for inserting the rotating limiting members into the rotating groove.

[0019] Compared with the prior art, the beneficial effects of this utility model are: (1) This utility model adopts a fixed feeding system. Through the exponential function model and multi-parameter closed-loop control, it can achieve precise matching between the amount of quicklime fed and the actual demand, significantly reduce the overfeeding of raw materials, reduce the system operating cost, and the emergency control module can quickly respond to the problem of SO2 exceeding the standard at the outlet. Combined with real-time concentration monitoring, it can ensure that the environmental emission requirements can still be stably met when the operating conditions fluctuate. The whole process does not require manual intervention, reducing the workload of operation and maintenance and reducing human operation error. All components of the system adopt industrial standard equipment, which can be directly adapted to the transformation and upgrading of the existing CFB desulfurization system without modifying the main structure of the desulfurization tower. The application cost is low and the use effect of the fixed feeding system is improved.

[0020] (2) Through the protective components set in this utility model, the protective cover can protect the inlet CEMS and the outlet CEMS, and prevent dust and impurities in the flue gas from adhering to the CEMS probe, which would lead to a decrease in detection accuracy. Through the cleaning components, rotating toothed ring, rotating gear, mounting bracket and drive motor set in this utility model, the dust and impurities adhering to the protective cover can be cleaned, thereby improving the use effect of the protective cover. Through the cleaning components, cooling seat, liquid storage tank, liquid guiding ring, waterproof pump, cooling box, cooling pump and refrigeration equipment set in this utility model, the protective cover and cleaning components can be cooled, thereby preventing temperature fluctuations from affecting the measurement accuracy, and protecting the inlet CEMS and outlet CEMS from the impact, extending the service life of the inlet CEMS and outlet CEMS, and improving the use effect of the fixed feeding system. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of the present invention.

[0022] Figure 2 This is a partial structural diagram of the inlet CEMS and protective components in this utility model.

[0023] Figure 3 This is a cross-sectional view of the export CEMS and protective components in this utility model.

[0024] Figure 4 In this utility model Figure 3 Enlarged view of the structure at point A in the middle.

[0025] Figure 5 This is a partial structural diagram of the protective component in this utility model.

[0026] Figure 6 This is a partial structural diagram of the liquid guiding ring and waterproof pump in this utility model.

[0027] Figure 7 This is a partial structural diagram of the rotating structure in this utility model.

[0028] Figure 8 This is a partial structural diagram of the collection box and the feeding plate in this utility model.

[0029] In the diagram: 1. Fixed feeding controller; 2. Inlet CEMS; 3. Weighing scale for hydrated lime silo; 4. Weighing scale for quicklime silo; 5. Screw feeder for hydrated lime silo; 6. Outlet CEMS; 7. Desulfurization tower; 8. Protective cover; 9. Cleaning component; 10. Rotating structure; 11. Cooling structure; 12. Cooling seat; 13. Liquid storage tank; 14. Liquid guiding ring; 15. Waterproof pump; 16. Hydrated lime silo; 17. Quicklime silo; 18. Chimney; 19. Booster fan; 20. Sealing ring; 21. Cooling box; 22. Cooling pump; 23. Refrigeration equipment; 24. Rotating gear ring; 25. Rotating gear; 26. Mounting bracket; 27. Drive motor; 28. Rotation limit component; 29. ​​Rotating support seat; 30. Reinforcing ring. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0031] Example 1 Please see Figure 1 This application provides a fixed feeding system for CFB desulfurization process, including a fixed feeding controller 1, an inlet CEMS 2, a hydrated lime silo weighing meter 3, a quicklime silo weighing meter 4, a hydrated lime silo screw feeder 5, and an outlet CEMS 6. The fixed feed controller 1 adopts an industrial-grade PLC (such as Siemens S7-1200 series), which integrates a data fitting module, a real-time calculation module, an emergency control module and a consumption comparison module. It is installed in the desulfurization control room as the core control unit of the system. It is connected to other components via RS485 bus or Ethernet to realize data reception, calculation and instruction output. The SO2 concentration monitoring device selected for the inlet CEMS2 is installed in the flue gas inlet pipe of the desulfurization tower 7. The sampling frequency is 1 time / 5s, and the SO2 concentration data of the inlet flue gas is collected in real time and transmitted to the fixed feed controller 1. The lime silo weighing meter 3 uses a suspended strain gauge weighing sensor with an accuracy of ±0.5%. It is installed on the bottom support of the lime silo and directly measures the overall weight of the lime silo (including the silo body and materials). The weight data is collected every 10 seconds and transmitted to the fixed feeding controller 1. The actual consumption of lime is calculated by the weight change. Quicklime silo weighing meter 4: Its structure and function are the same as those of slaked lime silo weighing meter 3. It is installed at the bottom of quicklime silo 17 and is used to collect quicklime weight data to assist in calculating the total consumption of raw materials (quicklime is the raw material for slaked lime, and the material conversion efficiency can be verified by correlating the consumption). Screw feeder 5 for hydrated lime silo: adopts a variable frequency speed control screw feeder with a motor power of 2.2kW, installed below the outlet of hydrated lime silo 16, receives frequency control commands (frequency range 0-50Hz) from the fixed feeding controller 1, and controls the amount of hydrated lime fed by adjusting the motor speed. The correspondence between frequency and feeding amount is determined through prior calibration (e.g., 1Hz corresponds to a feeding amount of 3.4kg / h). The outlet CEMS6 is used to monitor the SO2 concentration of the flue gas at the outlet. Outlet CEMS6: Its structure is identical to inlet CEMS2. It is installed in the clean flue gas outlet pipe of desulfurization tower 7, sampling once every 5 seconds. It collects SO2 concentration data of the outlet flue gas in real time and transmits it to the fixed feed controller 1 to monitor whether the desulfurization effect meets the environmental standard (SO2 concentration ≤ 35 mg / Nm³). 3 ); The fixed feeding controller 1 receives data from each monitoring device and controls the operating frequency of the slaked lime silo screw feeder 5 through a built-in algorithm, thereby realizing intelligent control of raw material feeding.

[0032] The slaked lime bin weighing meter 3 is connected to the slaked lime bin 16, the quicklime bin weighing meter 4 is connected to the quicklime bin 17, the slaked lime bin screw feeder 5 is connected to the desulfurization tower 7, the inlet CEMS2 is set at the inlet flue gas pipe of the desulfurization tower 7, the outlet CEMS6 is set on the chimney 18, and the desulfurization tower 7 is connected to the chimney 18 through the booster fan 19.

[0033] The data fitting module, by inputting historical operating data, fits the relationship between inlet SO2 concentration and raw material consumption into an exponential function: y=a*b nx+m +c; Where x is the inlet SO2 concentration, in mg / Nm³. 3 ; y represents the raw material consumption, in kg / h; a, b, n, m, and c are the fitting parameters.

[0034] The real-time calculation module receives real-time SO2 concentration data from the inlet CEMS2, substitutes it into the exponential function formula to calculate the theoretical feed rate, and converts it into the operating frequency command of the slaked lime silo screw feeder 5.

[0035] The emergency control module detected an SO2 concentration ≥35 mg / Nm³ at the outlet CEMS6. 3 When the duration is ≥3min, the operating frequency of the screw feeder 5 in the quicklime silo is increased by 10Hz every 30s until the SO2 concentration at the outlet CEMS6 shows a downward trend.

[0036] The real-time calculation module of the fixed feeding controller 1 is also used to calculate the average value of the SO2 concentration data collected by the inlet CEMS2, substitute the average value into the exponential function formula, obtain the theoretical total consumption of quicklime for the day, and further convert it into the theoretical feeding amount per hour.

[0037] The fixed feeding controller 1 also includes a consumption comparison module; The consumption comparison module receives the weight data from the slaked lime silo weighing scale 3 and the quicklime silo weighing scale 4, calculates the actual total consumption of raw materials for the day, and compares it with the theoretical total consumption for the day obtained by the real-time calculation module. If the deviation between the actual consumption and the theoretical consumption is ≥10%, then adjust the operating frequency adjustment step of the screw feeder 5 in the slaked lime silo.

[0038] In this embodiment, model initialization before system startup involves inputting the target unit's historical operating data for the past three months into the fixed feed controller 1. The data must include the daily inlet SO2 concentration x (unit: mg / Nm³). 3 Coverage of 50–500 mg / Nm 3 The common operating conditions range), the corresponding daily total consumption of quicklime y (unit kg), and the effective data sample size ≥ 500 groups; The data fitting module uses the least squares method to fit historical data and generate an exponential function formula: y=a・bⁿˣ+m+c, where a, b, n, m, and c are fitting parameters (for example, a=0.85, b=1.02, n=0.01, m=20, c=5 obtained by fitting data from a certain unit). This formula is used to establish a quantitative correlation between inlet SO2 concentration and hydrated lime consumption.

[0039] In this embodiment, the system operates under real-time control during normal operation: the inlet CEMS2 collects inlet SO2 concentration data every 5 seconds and transmits it to the real-time calculation module of the fixed feed controller 1; the real-time calculation module calculates the average value of 12 consecutive sets of data (i.e., data within 1 minute) to obtain the average inlet SO2 concentration to avoid interference from instantaneous fluctuations; this average value is substituted into the exponential function formula to calculate the theoretical total consumption of quicklime for the day, which is further converted into the theoretical feed rate per hour (for example, the average inlet SO2 concentration for the day is 200 mg / Nm³). 3 Substituting into the formula, the total daily consumption is calculated to be 2880 kg, and the theoretical feed rate per hour is 120 kg / h. The real-time calculation module generates the operating frequency command (e.g., 120kg / h corresponds to 35Hz) for the slaked lime silo screw feeder 5 based on the theoretical feeding rate per hour and the previously calibrated "frequency-feeding rate" correspondence, and sends it to the feeder to achieve precise feeding.

[0040] In this embodiment, the emergency handling procedure for when the outlet SO2 concentration exceeds the standard is as follows: the outlet CEMS6 transmits the outlet SO2 concentration data to the emergency control module of the fixed feed controller 1 in real time; when the emergency control module detects that the outlet SO2 concentration is ≥35mg / Nm³, 3If the duration is ≥3 minutes (i.e., all 36 consecutive data sets exceed the standard), it is determined to be an "emission exceeding the standard condition," and the emergency mode is immediately activated: control the screw feeder 5 of the quicklime silo to increase its operating frequency by 10Hz every 30 seconds (e.g., from 35Hz to 45Hz), while continuously monitoring the change in SO2 concentration at the outlet; when the outlet CEMS6 detects a decreasing trend in SO2 concentration (a decrease of ≥2mg / Nm³ for 3 consecutive data sets), 3 The emergency control module stops frequency boosting and reverts to the frequency command of the real-time control phase.

[0041] In this embodiment, dynamic correction and continuous optimization are performed: the consumption comparison module of the fixed feeding controller 1 receives the weight data of the quicklime silo weighing meter 3 and the fast lime silo weighing meter 4 every 1 hour, and calculates the actual consumption of quicklime in the past 1 hour (calculated by the weight difference before and after). The actual consumption is compared with the theoretical feed rate obtained by the real-time calculation module. If the deviation is ≥10%, for example, theoretical 120kg / h, actual 135kg / h, deviation 12.5%, the frequency adjustment step of the screw feeder 5 in the quicklime silo is automatically adjusted (e.g., from 10Hz / 30s to 5Hz / 30s), and the corrected data is fed back to the data fitting module for subsequent optimization of model parameters.

[0042] Example 2 Based on Example 1, referring to Figure 2 - Figure 7 This is the second embodiment of the present invention. In this invention, both the inlet CEMS2 and the outlet CEMS6 use CEMS probes to monitor the SO2 concentration in the flue gas, and both the inlet CEMS2 and the outlet CEMS6 include CEMS probe boxes. Both the inlet CEMS2 and the outlet CEMS6 are equipped with protective components to protect the CEMS probes.

[0043] The protective components include: a protective cover 8, a cleaning component 9, a rotating structure 10, and a cooling structure 11; The protective cover 8 is installed on the outside of the CEMS probe and filters dust and impurities in the flue gas. The protective cover 8 is evenly provided with filter holes. The cleaning component 9 is movably disposed on the outside of the protective cover 8 to clean the dust and impurities adhering to the protective cover 8. The cleaning component 9 includes a first cleaning strip symmetrically disposed on the protective cover 8 and a second cleaning strip disposed at the end of the protective cover 8 away from the CEMS probe box. The inner side of the first cleaning strip is an arc-shaped surface that fits against the outer wall of the protective cover 8. The first cleaning strip and the second cleaning strip are provided with a connected cooling cavity. Two rotating structures 10 are respectively installed inside the inlet CEMS2 and the outlet CEMS6. The rotating structure 10 is installed inside the CEMS probe box and controls the cleaning component 9 to rotate on the protective cover 8. Cooling structures 11 are respectively installed inside the inlet CEMS2 and the outlet CEMS6, and the flue gas entering the protective cover 8 is cooled by cleaning components 9.

[0044] In this embodiment, the cooling structure 11 is activated to cool the flue gas at the protective cover 8 and the cleaning component 9, thereby effectively protecting the CEMS probe. The protective cover 8 can filter dust and impurities in the flue gas and allow the filtered flue gas to enter the CEMS probe, so that the inlet CEMS2 and outlet CEMS6 can monitor the SO2 concentration in the flue gas. Every once in a while, the rotating structure 10 is activated, which drives the cleaning component 9 to rotate on the protective cover 8, so that the cleaning component 9 can clean the impurities on the protective cover 8.

[0045] The cooling structure 11 includes a cooling base 12 and a liquid storage tank 13; The cooling seat 12 is connected to the cleaning component 9. The cooling seat 12 is provided with a cooling pipe that communicates with the cooling chamber. The cooling seat 12 is rotatably mounted on the outside of the protective cover 8. The liquid storage tank 13 is connected to the cooling base 12 through the liquid guide ring 14. The liquid guide ring 14 is equipped with a waterproof pump 15 that controls the circulation of the coolant in the liquid storage tank 13 in the cooling base 12 and the cleaning component 9.

[0046] In this embodiment, the waterproof pump 15 is started to draw the coolant in the storage tank 13 into the liquid guiding ring 14, and the coolant enters the cleaning component 9 through the liquid guiding ring 14 to cool the cleaning component 9. The cleaning component 9 cools the protective cover 8, thereby cooling the flue gas entering the protective cover 8, effectively protecting the inlet CEMS2 and outlet CEMS6, and extending the service life of the inlet CEMS2 and outlet CEMS6.

[0047] The liquid storage tank 13 is located on the inner bottom surface of the CEMS probe box, and the liquid guiding ring 14 is located on the outer wall of the cooling base 12. Both the liquid guiding ring 14 and the cooling base 12 are circular ring structures. The liquid storage tank 13 is provided with through holes that match the liquid guiding ring 14, and the liquid storage tank 13 is symmetrically provided with sealing rings 20 that fit with the liquid guiding ring 14. The liquid guiding ring 14 is movably disposed inside the liquid storage tank 13. The waterproof pump 15 can draw the coolant in the liquid storage tank 13 into the cooling seat 12 and then into the cleaning component 9, so that the cleaning component 9 cools the protective cover 8 and the gas near the protective cover 8.

[0048] In this embodiment, when the cooling seat 12 rotates, it causes the liquid guiding ring 14 to rotate, which in turn causes the waterproof pump 15 to rotate inside the liquid storage tank 13. The waterproof pump 15 is then activated to extract the coolant from the liquid storage tank 13 or to introduce the coolant from the cleaning component 9 into the liquid storage tank 13.

[0049] The lower end face of the CEMS probe box is provided with a cooling box 21. The interior of the CEMS probe box is symmetrically provided with a cooling pump 22 that connects the cooling box 21 and the liquid storage tank 13. The cooling pump 22 is provided with a cold water pipe that connects to the cooling box 21 and the liquid storage tank 13 respectively. The interior of the cooling box 21 is provided with a refrigeration device 23 for cooling the coolant. This allows the cooling pump 22 to introduce the high-temperature coolant in the liquid storage tank 13 into the cooling box 21 for cooling, and to introduce the low-temperature coolant in the cooling box 21 into the liquid storage tank 13.

[0050] In this embodiment, the cooling pump 22 is started to pump the coolant in the cooling tank 21 into the storage tank 13 to cool the high-temperature coolant in the storage tank 13. Another cooling pump 22 is started to introduce the high-temperature coolant in the storage tank 13 into the cooling tank 21. The refrigeration equipment 23 is started to cool the coolant in the cooling tank 21.

[0051] Example 3 Based on Example 2, referring to Figure 3 - Figure 5 and Figure 8 This is the third embodiment of the present invention. In this invention, the rotating structure 10 includes a rotating toothed ring 24 vertically disposed on the outside of the cooling seat 12 and a rotating gear 25 controlling the rotating toothed ring 24 to rotate. The rotating toothed ring 24 and the rotating gear 25 mesh with each other. The other end of the rotating toothed ring 24 is provided with a reinforcing ring 30 connected to the cooling seat 12. The top inner surface of the CEMS probe box is provided with a mounting bracket 26 that is rotatably connected to the rotating gear 25, and the other side of the mounting bracket 26 is provided with a drive motor 27 that controls the rotation of the rotating gear 25. Both the rotating gear ring 24 and the rotating gear 25 are offset from the cooling seat 12.

[0052] In this embodiment, the drive motor 27 is started, which drives the rotating gear 25 to rotate on the mounting bracket 26. The rotating gear 25 drives the rotating gear ring 24 to rotate, the rotating gear ring 24 drives the reinforcing ring 30 to rotate, and the reinforcing ring 30 drives the cooling seat 12 to rotate, so that the cooling seat 12 drives the cleaning component 9 to rotate.

[0053] The outer wall of the cooling base 12 is provided with a number of rotating limiting members 28 in a circular array. The CEMS probe box is provided with a rotating support 29 that is rotatably connected to the rotating limiting members 28. The rotating support 29 is provided with a rotating groove for the rotating limiting members 28 to rotate, and a plug slot for inserting the rotating limiting members 28 into the rotating groove. The protective cover 8 is fixedly installed on the CEMS probe box, and the cleaning member 9 is movably installed on the outside of the CEMS probe box.

[0054] In this embodiment, the drive motor 27 is started, and the cooling seat 12 is driven to rotate through the rotating gear 25 and the rotating gear ring 24. The rotation of the cooling seat 12 drives the rotating limiting member 28 to rotate, so that the rotating limiting member 28 rotates in the rotating groove, thereby improving the stability of the cooling seat 12 when it rotates.

[0055] The above embodiments are only used to illustrate the technical methods of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of this utility model without departing from the spirit and scope of the technical methods of this utility model.

Claims

1. A fixed feed system for CFB desulfurization process, characterized in that, include: A fixed feeding controller (1) is used for data processing, model calculation and instruction output; Inlet CEMS (2) is used to monitor SO2 concentration in inlet flue gas; Weighing meters (3) for hydrated lime silos and (4) for quicklime silos are used to monitor the consumption of raw materials. The screw feeder (5) for slaked lime silo is used to control the amount of raw material fed; Export CEMS (6) is used to monitor SO2 concentration in the flue gas at the outlet. The fixed feeding controller (1) receives data from each monitoring device and controls the operating frequency of the lime silo screw feeder (5) through a built-in algorithm to achieve intelligent control of raw material feeding.

2. The fixed feed system for CFB desulfurization process according to claim 1, characterized in that, The fixed feeding controller (1) has a built-in data fitting module, a real-time calculation module and an emergency control module.

3. A fixed feed system for CFB desulfurization process according to claim 2, characterized in that, The data fitting module, by inputting historical operating data, fits the relationship between inlet SO2 concentration and raw material consumption into an exponential function: y=a*b nx+m +c; Where x is the inlet SO2 concentration and y is the raw material consumption.

4. A fixed feed system for CFB desulfurization process according to claim 3, characterized in that, The real-time calculation module receives real-time SO2 concentration data from the inlet CEMS (2), substitutes it into the exponential function formula to calculate the theoretical feed amount, and converts it into the operating frequency command of the lime silo screw feeder (5).

5. A fixed feed system for CFB desulfurization process according to claim 4, characterized in that, The emergency control module detected an SO2 concentration ≥35 mg / Nm at the outlet CEMS (6). 3 When the duration is ≥3min, the operating frequency of the slaked lime silo screw feeder (5) is increased by 10Hz every 30s until the SO2 concentration of the outlet CEMS (6) shows a downward trend.

6. A fixed feed system for CFB desulfurization process according to claim 5, characterized in that, The real-time calculation module of the fixed feeding controller (1) is also used to calculate the average value of the SO2 concentration data collected by the inlet CEMS (2), substitute the average value into the exponential function formula, obtain the theoretical total hydrated lime consumption for the day, and further convert it into the theoretical feeding amount per hour.

7. A fixed feed system for CFB desulfurization process according to claim 6, characterized in that, The fixed feeding controller (1) also includes a consumption comparison module; The consumption comparison module receives the weight data from the slaked lime silo weighing scale (3) and the quicklime silo weighing scale (4), calculates the actual total consumption of raw materials on the day, and compares it with the theoretical total consumption on the day obtained by the real-time calculation module. If the actual consumption deviates from the theoretical consumption by ≥10%, then adjust the operating frequency adjustment step of the slaked lime silo screw feeder (5).

8. A fixed feed system for CFB desulfurization process according to claim 1, characterized in that, Both the inlet CEMS (2) and the outlet CEMS (6) use CEMS probes to monitor the SO2 concentration in the flue gas; Both the inlet CEMS (2) and the outlet CEMS (6) are equipped with protective components to protect the CEMS probe.

9. A fixed feed system for CFB desulfurization process according to claim 8, characterized in that, The protective components include: The protective cover (8) is installed on the outside of the CEMS probe and filters dust and impurities in the flue gas. The cleaning component (9) is movable outside the protective cover (8) to clean the dust and impurities adhering to the protective cover (8); A rotating structure (10) is respectively installed inside the inlet CEMS (2) and the outlet CEMS (6), and controls the cleaning component (9) to rotate on the protective cover (8); Cooling structures (11) are respectively installed inside the inlet CEMS (2) and the outlet CEMS (6), and the flue gas entering the protective cover (8) is cooled by cleaning components (9).

10. A fixed feed system for CFB desulfurization process according to claim 9, characterized in that, The cooling structure (11) includes: The cooling seat (12) is connected to the cleaning component (9) and is rotatably mounted on the outside of the protective cover (8); The liquid storage tank (13) is connected to the cooling seat (12) through the liquid guide ring (14). The liquid guide ring (14) is equipped with a waterproof pump (15) that controls the circulation of the coolant in the liquid storage tank (13) in the cooling seat (12) and the cleaning component (9).

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