Device and method for measuring concentration of slaked lime slurry on line

Abstract

The invention relates to the technical field of slurry concentration on-line measurement, and discloses a slaked lime slurry concentration on-line measurement device and a slaked lime slurry concentration on-line measurement method, the slaked lime slurry concentration on-line measurement device comprises a slurry on-line measurement main loop, a prepared water measurement branch, a chemical cleaning circulation branch and a controller; slaked lime slurry to be measured is introduced into the slurry online measurement main loop, and treated slurry is discharged; the prepared water measuring branch is connected with the slurry online measuring main loop; the chemical cleaning circulation branch is connected in parallel with the slurry on-line measurement main loop; and the prepared water measuring branch is connected with the chemical cleaning circulating branch. Compared with the existing manual measurement, the method can quickly, stably and accurately realize the measurement of the concentration of the slaked lime slurry, and is beneficial to the intelligent operation of a lime softening, coagulation and clarification treatment system.

Description

Technical Field

[0001] The present invention relates to the technical field of slurry concentration online measurement, and in particular to a slaked lime slurry concentration online measurement device and method. Background Art

[0002] Urban reclaimed water often undergoes lime softening, coagulation, and clarification treatment to effectively remove colloids, organic matter, and total phosphorus from the water, and to reduce alkalinity and hardness to achieve a softening effect before it can be used as cooling water makeup or a source for demineralized water equipment. During the actual operation of lime softening, coagulation, and clarification treatment, problems such as uneven slaked lime powder feeding and unstable slaked lime slurry concentration often lead to inadequate treatment results and poor effluent quality. This results in a high workload for lime coagulation and clarification system operation and maintenance, and seriously impacts the operational stability of subsequent cooling equipment, membrane treatment processes, and other equipment. Therefore, obtaining the slaked lime slurry concentration is of great significance for the stable operation and automatic control of lime softening, coagulation, and clarification treatment.

[0003] While a mature method, manual testing and monitoring require personnel, increasing operational labor costs and making the process cumbersome. Furthermore, long inspection intervals prevent timely monitoring of the lime softening, coagulation, and clarification process. Operational control lags, making it unable to accommodate frequent load fluctuations. This can easily lead to substandard treatment results and poor effluent quality. Furthermore, manual testing and monitoring methods are subject to significant human influence, making them difficult to adapt to automated or intelligent operations, posing a potential safety hazard. Summary of the Invention

[0004] To solve the existing problems, the present invention provides an online measurement device and method for slaked lime slurry concentration, which aims to stably measure the slaked lime slurry concentration online without manual intervention, ensure timely, stable and accurate monitoring of the slaked lime slurry concentration, and overcome the problem that the sensor is scaled and the reading cannot reflect the stable concentration of the flowing slurry in real time; periodically perform lime softening, coagulation and clarification treatment operations, and monitor and feedback the clarification results in real time; the present invention provides a timely control reference for the long-term continuous operation of slaked lime slurry, thereby improving the role of standardized water supply and stabilizing water quality.

[0005] In order to achieve the above objectives, in a first aspect, the present invention provides the following technical solutions.

[0006] A device for online measurement of slaked lime slurry concentration comprises a slurry online measurement main circuit, a preparation water measurement branch, a chemical cleaning circulation branch and a controller; the slaked lime slurry to be measured is introduced into the slurry online measurement main circuit and the treated slurry is discharged; the preparation water measurement branch is connected to the slurry online measurement main circuit; the chemical cleaning circulation branch is connected in parallel to the slurry online measurement main circuit; and the preparation water measurement branch is connected to the chemical cleaning circulation branch.

[0007] As a further improvement of the present invention, the slurry online measurement main circuit includes a sampling electric valve, a sampling pump, a detection sensor and a slurry discharge electric valve in sequence; the sampling electric valve, the sampling pump, the detection sensor and the slurry discharge electric valve are all electrically connected to the controller.

[0008] As a further improvement of the present invention, the prepared water measurement branch is connected to the slurry online measurement main circuit between the sampling electric valve and the sampling pump; the prepared water measurement branch includes a prepared water storage tank and a prepared water electric valve; the prepared water electric valve is electrically connected to the controller.

[0009] As a further improvement of the present invention, the chemical cleaning circulation branch is connected to the slurry online test main circuit before the sampling pump and after the detection sensor; the chemical cleaning circulation branch includes a cleaning agent circulation solenoid valve and a cleaning agent addition branch in sequence; the cleaning agent circulation solenoid valve is electrically connected to the controller.

[0010] As a further improvement of the present invention, the cleaning agent adding branch includes a cleaning agent pump, a cleaning agent solenoid valve and a cleaning agent storage tank in sequence; the cleaning agent pump and the cleaning agent solenoid valve are both electrically connected to the controller.

[0011] In a second aspect, the present invention further discloses an online measurement method based on the concentration of slaked lime slurry, when the slaked lime slurry to be measured flows through the detection sensor, the detection sensor is turned on; After the detection sensor has been measuring continuously for a period of time, close the sampling electric valve, then open the prepared water electric valve and flush the detection sensor with prepared water; After the prepared water is used to flush the detection sensor for the set time, the corresponding detection sensor reading of the prepared water is compared with the set value c0; if the reading is higher than the set value, the detection sensor is chemically cleaned. After the chemical cleaning is carried out for a period of time, the corresponding detection sensor reading of the prepared water is compared with the set value c0. If the reading is still higher than the set value, a fault alarm is issued; if the reading is lower than or equal to the set value, the chemical cleaning is completed and the detection sensor measurement of the slaked lime slurry to be tested is returned.

[0012] As a further improvement of the present invention, the continuous measurement period of the detection sensor is 2 hours.

[0013] As a further improvement of the present invention, the prepared water is slaked lime slurry with a concentration of a set value c0.

[0014] As a further improvement of the present invention, the set value c0 is 0.2%.

[0015] As a further improvement of the present invention, the chemical cleaning time is 5 minutes.

[0016] The present invention has the following beneficial effects: This measuring device realizes the integration of measurement, flushing and cleaning by setting up a slurry online measurement main circuit, a prepared water measurement branch and a chemical cleaning circulation branch, thereby improving the system integration and operating efficiency; at the same time, the separation of the main circuit and the branch circuit realizes functional decoupling, which facilitates troubleshooting and component replacement.

[0017] Optionally, a sampling electric valve, sampling pump, detection sensor and slurry discharge electric valve ensure the smooth flow and accurate measurement of the slurry, avoiding bubbles or blockages that interfere with the measurement results; dynamically adjust the opening and closing of the valves to enhance the system's responsiveness while reducing equipment complexity.

[0018] Preferably, the preparation water storage tank and the preparation water electric valve shorten the flushing preparation time and do not need to empty the main circuit, making the flushing process more convenient and controllable, further improving the measurement accuracy; the independent storage tank and valve design avoids the mixing of preparation water and the slurry to be measured, affecting the calibration accuracy.

[0019] Optionally, the cleaning agent circulation solenoid valve and cleaning agent addition branch realize automatic cleaning, reduce manual operation, improve cleaning efficiency and convenience of equipment maintenance; the chemical cleaning circulation branch is connected before the sampling pump and after the detection sensor, which helps the cleaning agent to act directly on the sensor surface and improve the scale removal efficiency.

[0020] Optionally, the cleaning agent pump, cleaning agent solenoid valve and cleaning agent storage tank ensure the precise addition and recycling of cleaning agent, which not only saves cleaning agent but also improves the cleaning effect; the pump and solenoid valve are linked to ensure that the cleaning agent is added in a quantitative manner on demand, reducing waste and the risk of secondary pollution; the modular storage tank design supports flexible replacement of cleaning agent types to adapt to different scaling components.

[0021] This measurement method provides an online method for measuring the concentration of slaked lime slurry, capable of monitoring concentration changes in real time. It effectively solves sensor structure or drift problems through water flushing and chemical cleaning, ensures the accuracy of the detection sensor, and avoids measurement errors caused by sensor contamination. By comparing the configured water reading with the set value, it automatically triggers cleaning or alarms, reducing errors in manual judgment and improving system reliability. It supports continuous automatic measurement for up to 2 hours, breaking through the intermittent limitations of manual detection and meeting the needs of real-time production control.

[0022] Preferably, the continuous measurement period of the detection sensor is set to 2 hours, which balances the measurement frequency and equipment loss; the interval time not only ensures the timeliness of data update, but also prevents the interference of slurry flow stratification on the measurement.

[0023] Preferably, slaked lime slurry with a concentration of set value c0 is used as the preparation water to ensure the standardization of the flushing process, eliminate the sensor residual error caused by solvent differences, and avoid measurement errors caused by inconsistent flushing media; the flushing process is closer to the actual slurry characteristics, avoiding pure water flushing causing sudden damage to the sensor's sensitive elements.

[0024] Preferably, the set value c0 is clearly set to 0.2%, which provides a specific concentration reference value, facilitates actual operation and calibration, and improves the accuracy and consistency of measurement; fixed values set based on experience can simplify the operation and maintenance process and reduce the complexity of manual parameter setting.

[0025] Preferably, the chemical cleaning time is set to 5 minutes, taking into account both the adequacy of chemical cleaning and the corrosion resistance requirements of the equipment to avoid corrosion of the sensor for too long; the cleaning process is completed quickly to reduce the impact on the continuity of online monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are merely schematic and are used to facilitate understanding of the present invention. They are not intended to limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 This is a connection diagram of an online measurement device for slaked lime slurry concentration according to an embodiment; Figure 2 A step diagram of an online method for measuring the concentration of slaked lime slurry according to an embodiment; Among them, 1. Sampling electric valve; 2. Sampling pump; 3. Cleaning agent storage tank; 4. Cleaning agent solenoid valve; 5. Detection sensor; 6. Slurry discharge electric valve; 7. Cleaning agent circulation solenoid valve; 8. Controller; 9. Chemical cleaning circulation branch; 10. Preparation water electric valve. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0028] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Calcium ions Ca in slaked lime solution (saturated calcium hydroxide solution) 2+ Easy to react with CO3 in fluid 2- 、SO4 2- The anions combine to form insoluble salts such as calcium carbonate CaCO3 and calcium sulfate CaSO4, which are deposited on the sensor surface to form a dense scale layer. 2+ The concentration is about 1.8 g / L at 25 ° C. When the temperature drops or the concentration exceeds this value, the precipitation is accelerated. The activity product of the ions in the solution exceeds the solubility product constant (such as K of CaCO3). sp ≈4.5×10 -9 ), the scaling rate is significantly increased. Based on the above mechanism, the present invention adopts real-time sampling, dynamic detection and automatic cleaning methods to effectively alleviate the scaling effect of slaked lime slurry on sensors, ensuring the efficient and controllable implementation of the water softening water treatment process.

[0031] Example 1 like Figure 2As shown, an online measuring device for slaked lime slurry concentration of the present invention includes a sampling unit, a cleaning unit, and a control and detection unit. The sampling unit includes a sampling electric valve 1, a sampling pump 2, and a preparation water electric valve 10. The sampling electric valve 1 and the preparation water electric valve 10 are respectively connected to the inlet main pipe of the sampling pump 2 through pipelines; the cleaning unit includes a cleaning agent storage tank 3, a cleaning agent solenoid valve 4 and a chemical cleaning circulation branch 9. The outlet and inlet of the cleaning agent solenoid valve 4 are respectively connected to the chemical cleaning circulation branch 9 and the cleaning agent storage tank 3 through pipelines, and the chemical cleaning circulation branch 9 is connected to the inlet main pipe of the sampling pump 2; the control and detection unit includes a detection sensor 5, a slurry discharge electric valve 6, a cleaning agent circulation solenoid valve 7 and a controller 8. The inlet of the detection sensor 5 is connected to the outlet of the sampling pump 2 through a pipeline, and the slurry discharge electric valve 6 and the cleaning agent circulation solenoid valve 7 are connected to the outlet main pipe of the detection sensor 5 through a pipeline; the sampling electric valve 1, sampling pump 2, cleaning agent solenoid valve 4, detection sensor 5, slurry discharge electric valve 6 and cleaning agent circulation solenoid valve 7 are all electrically connected to the controller 8. The sampling electric valve 1, sampling pump 2, detection sensor 5 and slurry discharge electric valve 6 ensure the smooth flow and accurate measurement of the slurry, avoiding bubbles or blockages that interfere with the measurement results; dynamically adjust the valve opening and closing to enhance the system's response capability while reducing equipment complexity.

[0032] The cleaning agent can be a sulfamic acid solution or citric acid plus a corrosion inhibitor. The sulfamic acid solution can be selected at a concentration of 5-10% (below 60°C) and is suitable for mixed scales of calcium carbonate and calcium sulfate. This solution has a high dissolution rate for specific deposits, but is accompanied by some slower corrosion. Citric acid plus a corrosion inhibitor can be prepared by adding 0.5% corrosion inhibitor to a citric acid solution (pH = 3-4). This solution is suitable for microporous scale on sensor surfaces. This solution has a milder removal and dissolution effect and can prevent electrode oxidation.

[0033] Based on the above measuring device, its specific working process is as follows: Open the sampling electric valve 1, sampling pump 2 and slurry discharge electric valve 6. After the sampling pump 2 sends the slaked lime slurry to be tested into the detection sensor 5 for about 1 minute, open the detection sensor 5 to measure the concentration of the slaked lime slurry; after continuous measurement for 2 hours, close the sampling electric valve 1, open the preparation water electric valve 10, and rinse the detection sensor 5 with preparation water. After 2 minutes, if the concentration of slaked lime slurry measured by the detection sensor 5 is greater than a certain set value c0 (for example, c0 is set to 0.2%), chemical cleaning is carried out (close the preparation water electric valve 10, open the cleaning agent solenoid valve 4 for about 10 seconds, close the cleaning agent solenoid valve 4 and the slurry discharge valve 6). Drain the electric valve 6, open the cleaning agent circulation solenoid valve 7, and carry out circulation cleaning for 5 minutes. Then, open the slurry discharge electric valve 6 and the preparation water electric valve 10, and rinse for 2 minutes. Then, open the detection sensor 5 for measurement, close the preparation water electric valve 10 and the cleaning agent circulation solenoid valve 7. If the detection sensor 5 measures that the slaked lime slurry concentration is still greater than the set value c0, a fault alarm is issued, otherwise self-cleaning is completed). After the cleaning is completed, continue to monitor the concentration of the slaked lime slurry to be measured online; otherwise, close the preparation water electric valve 10, open the sampling electric valve 1, and continue to monitor the concentration of the slaked lime slurry to be measured online.

[0034] The method of the present invention can conveniently realize simultaneous online measurement of slaked lime slurry concentration without manual intervention.

[0035] The following combination Figure 1 and Figure 2 The specific embodiments of the present invention are further described.

[0036] As attached Figure 2 As shown, the sampling electric valve 1, the sampling pump 2 and the slurry discharge electric valve 6 are opened. The sampling pump 2 sends the slaked lime slurry to be tested into the detection sensor 5 for about 1 minute, and then the detection sensor 5 is opened to measure the concentration of the slaked lime slurry.

[0037] After 2 hours of continuous measurement, the sampling electric valve 1 is closed, the preparation water electric valve 10 is opened, and the detection sensor 5 is rinsed with preparation water. After 2 minutes, if the detection sensor 5 measures that the slaked lime slurry concentration is greater than a certain set value c0 (such as c0 is set to 0.2%), chemical cleaning is performed (close the preparation water electric valve 10, open the cleaning agent solenoid valve 4 for about 10 seconds, close the cleaning agent solenoid valve 4 and the slurry discharge electric valve 6, open the cleaning agent circulation solenoid valve 7, perform circulation cleaning for 5 minutes, open the slurry discharge electric valve 6 and the preparation water electric valve 10, rinse for 2 minutes, open the detection sensor 5 for measurement, close the preparation water electric valve 10 and the cleaning agent circulation solenoid valve 7, if the detection sensor 5 measures that the slaked lime slurry concentration is still greater than the set value c0, a fault alarm is issued, otherwise self-cleaning is completed). After cleaning is completed, online monitoring of the slaked lime slurry concentration to be measured continues; otherwise, close the preparation water electric valve 10, open the sampling electric valve 1, and continue to monitor the slaked lime slurry concentration to be measured online.

[0038] Example 2 As attached Figure 2 As shown, the sampling electric valve 1, the sampling pump 2 and the slurry discharge electric valve 6 are opened. The sampling pump 2 sends the slaked lime slurry to be tested into the detection sensor 5 for about 90 minutes, and then the detection sensor 5 is opened to measure the concentration of the slaked lime slurry.

[0039] After 2 hours of continuous measurement, the sampling electric valve 1 is closed, the preparation water electric valve 10 is opened, and the detection sensor 5 is rinsed with preparation water. After 2 minutes, if the detection sensor 5 measures that the concentration of slaked lime slurry is greater than a certain set value c0 (such as c0 is set to 0.1%), chemical cleaning is performed (close the preparation water electric valve 10, open the cleaning agent solenoid valve 4 for about 10 seconds, close the cleaning agent solenoid valve 4 and the slurry discharge electric valve 6, open the cleaning agent circulation solenoid valve 7, perform circulation cleaning for 5 minutes, open the slurry discharge electric valve 6 and the preparation water electric valve 10, rinse for 2 minutes, open the detection sensor 5 for measurement, close the preparation water electric valve 10 and the cleaning agent circulation solenoid valve 7, if the detection sensor 5 measures that the concentration of slaked lime slurry is still greater than the set value c0, a fault alarm is issued, otherwise self-cleaning is completed). After cleaning is completed, online monitoring of the slaked lime slurry concentration to be measured continues; otherwise, close the preparation water electric valve 10, open the sampling electric valve 1, and continue to monitor the slaked lime slurry concentration to be measured online.

[0040] In Example 2, a magnetizing device can be installed to magnetize the slaked lime slurry to reduce the formation of hard scale. The magnetic field acts on the calcium ions Ca through the Lorentz force. 2+ and carbonate ions CO3 2-This disrupts the binding pathway, causing CaCO3 to preferentially form metastable aragonite rather than dense calcite. Aragonite crystals are orthorhombic, with a needle-like or flocculent structure. Their low surface energy makes them difficult to adhere to pipe walls and easily washed away by water. Calcite, on the other hand, is hexagonal and forms dense, hard, and massive scale.

[0041] The magnetic field strength of the magnetizing device is greater than 0.1 T, which can significantly change the crystallization path. However, a magnetic field strength greater than 0.5 T may increase the energy consumption of the equipment. The magnetized slaked lime solution increases the flow rate of the solution in the pipe, and the turbulent flow and magnetic field can accelerate the removal of loose scale.

[0042] When the calcium ion concentration is too high, such as higher than 200 mg / L, the magnetization inhibition effect decreases and a softening pretreatment with a detergent is required.

[0043] For solutions with high iron content, the descaling effect of the magnetization device will be weakened. To address this problem, additional filtration pretreatment equipment can be added to reduce the iron ion content in the solution.

[0044] The value of C0 can be determined based on the specific application after lime softening, coagulation, and clarification. A concentration of 0.1%-0.2% can be used as an indicator level for rough treatment and is applicable to water supply before cooling water treatment, improving wastewater utilization. It can be used to neutralize acidic wastewater, reducing the subsequent treatment load. For the exothermic neutralization reaction, the mixing volume should be controlled to avoid damage to the container and personal injury. It can be used to disinfect livestock and poultry houses, inactivating some bacteria and viruses such as E. coli, and reducing the risk of cross-infection. It can also be used to neutralize acidic soils, improving the efficiency of calcium absorption by crops, and is particularly suitable for calcium-loving plants. It can be used for brushing on tree trunks. A 0.1% solution forms an alkaline barrier, repelling trunk-boring pests such as longhorn beetle larvae and reducing the attachment of insect eggs.

[0045] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment alone, but also includes any changes, replacements and other implementation methods that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online measuring device for slaked lime slurry concentration, characterized in that: The invention comprises a slurry online measurement main circuit, a preparation water measurement branch circuit, a chemical cleaning circulation branch circuit (9) and a controller (8); the slurry online measurement main circuit is fed with slaked lime slurry to be measured and the treated slurry is discharged; the preparation water measurement branch circuit is connected to the slurry online measurement main circuit; the chemical cleaning circulation branch circuit (9) is connected in parallel to the slurry online measurement main circuit; the preparation water measurement branch circuit is connected to the chemical cleaning circulation branch circuit (9).

2. The online measuring device for slaked lime slurry concentration according to claim 1, characterized in that: The slurry online measurement main circuit comprises a sampling electric valve (1), a sampling pump (2), a detection sensor (5) and a slurry discharge electric valve (6) in sequence; the sampling electric valve (1), the sampling pump (2), the detection sensor (5) and the slurry discharge electric valve (6) are all electrically connected to a controller (8).

3. The online measuring device for slaked lime slurry concentration according to claim 2, characterized in that: The prepared water measurement branch is connected to the slurry online measurement main circuit between the sampling electric valve (1) and the sampling pump (2); the prepared water measurement branch includes a prepared water storage tank and a prepared water electric valve (10); the prepared water electric valve (10) is electrically connected to the controller (8).

4. The online measuring device for slaked lime slurry concentration according to claim 3, characterized in that: The chemical cleaning circulation branch (9) is connected to the slurry online test main circuit before the sampling pump (2) and after the detection sensor (5); the chemical cleaning circulation branch (9) includes a cleaning agent circulation solenoid valve (7) and a cleaning agent addition branch in sequence; the cleaning agent circulation solenoid valve (7) is electrically connected to the controller (8).

5. An online measuring device for slaked lime slurry concentration as claimed in claim 4, characterized in that: The cleaning agent adding branch comprises a cleaning agent pump, a cleaning agent solenoid valve (4) and a cleaning agent storage tank (3) in sequence; the cleaning agent pump and the cleaning agent solenoid valve (4) are both electrically connected to the controller (8).

6. A method for online measurement of slaked lime slurry concentration, characterized in that: The following steps are involved: When the slaked lime slurry to be tested flows through the detection sensor (5), the detection sensor (5) is turned on; After the detection sensor (5) continuously measures for a period of time, the sampling electric valve (1) is closed, and then the prepared water electric valve is opened to flush the detection sensor (5) with prepared water; After the prepared water is used to flush the detection sensor (5) for a set time, the reading of the detection sensor (5) corresponding to the prepared water is compared with the set value c0; if the reading is higher than the set value, the detection sensor (5) is chemically cleaned. After the chemical cleaning is performed for a period of time, the reading of the detection sensor (5) corresponding to the prepared water is compared with the set value c0. If the reading is still higher than the set value, a fault alarm is issued; if the reading is lower than or equal to the set value, the chemical cleaning is completed and the detection sensor (5) is returned to measure the slaked lime slurry to be tested.

7. The method for online measurement of slaked lime slurry concentration according to claim 6, characterized in that: The continuous measurement period of the detection sensor (5) is 2 hours.

8. The method for online measurement of slaked lime slurry concentration according to claim 6, wherein: The prepared water is a slaked lime slurry with a concentration of a set value c0.

9. The method for online measurement of slaked lime slurry concentration according to claim 8, characterized in that: The set value c0 is 0.2%.

10. The method for online measurement of slaked lime slurry concentration according to claim 6, characterized in that: The chemical cleaning time is 5 minutes.

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