Maintenance-free online measurement system and method for key parameters of desulfurization slurry of power plant

Abstract

The invention discloses a maintenance-free online measurement system and method for key parameters of desulfurization slurry of a power plant, an outlet of a desulfurization slurry pipeline is divided into two paths after passing through a desulfurization slurry electromagnetic valve, one path is communicated with an inlet of a ceramic membrane filter, and the other path is communicated with a flushing water pipeline through a conventional flushing water electromagnetic valve; the flushing water pipeline is communicated with a water outlet of the ceramic membrane filter through the backwashing water electromagnetic valve, the water outlet of the ceramic membrane filter is communicated with an inlet of the chloride ion flow cell, and a water outlet of the chloride ion flow cell is communicated with an inlet of the pH flow cell; the pH flow cell is internally provided with a pH selective electrode, the chloride ion flow cell is internally provided with a chloride ion selective electrode, the system and the method can realize real-time measurement of chloride ions and pH of slurry, and the accuracy and the stability are relatively high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of desulfurization, and relates to a maintenance-free online measurement system and method for key parameters of desulfurization slurry of a power plant. BACKGROUND

[0002] As a mainstream desulfurization technology for coal-fired power plants, the core reaction of wet flue gas desulfurization (WFGD) occurs in limestone-gypsum slurry. The chlorine ion concentration and pH value of the slurry directly determine the desulfurization efficiency and equipment safety: the chlorine ion has strong corrosiveness, and when its concentration exceeds 20,000 ppm, it will accelerate the corrosion of the equipment, inhibit the decomposition of limestone, cause abnormal fluctuations of the pH value of the slurry, and thus reduce the desulfurization efficiency and increase the risk of gypsum scaling; and if the pH value exceeds the critical interval of 5.0-5.8, the desulfurization rate will be suddenly reduced or the pipeline will be blocked, significantly increasing the operating cost. Therefore, rapid and accurate monitoring of the chlorine ion and the pH value has decisive significance for equipment corrosion prevention, process optimization, and wastewater discharge up to standard.

[0003] At present, the chlorine ion in the desulfurization slurry generally relies on traditional manual detection methods, which exposes serious defects: the laboratory personnel need to take samples on site regularly, and obtain data through tedious titration operations, which takes a long time and is affected by human factors, and the measurement deviation of the chlorine ion is large; more seriously, the limited detection frequency causes a large number of monitoring blind spots, and cannot capture process transient fluctuations. Although the pH value of the slurry can be measured online by the real electrode method, it still faces three failure difficulties: the high-concentration gypsum particles in the slurry continuously erode the electrode, causing the pH glass electrode to break, and the average service life is only 3-5 months; the measuring pipeline is easily blocked by suspended matter deposition, causing response delay or even complete failure of the measurement system; finally, the cumulative error of the electrode daily drift is large under the high-temperature slurry environment, and the operation and maintenance personnel need to frequently calibrate and maintain to ensure the accuracy of the measurement results. SUMMARY

[0004] The purpose of the present application is to overcome the above-mentioned shortcomings of the prior art, and to provide a maintenance-free online measurement system and method for key parameters of desulfurization slurry of a power plant, which can realize real-time measurement of the chlorine ion and the pH value of the slurry, and has high accuracy and stability.

[0005] To achieve the above-mentioned purpose, the present application discloses a maintenance-free online measurement system for key parameters of desulfurization slurry of a power plant, which comprises a desulfurization slurry pipeline, a ceramic membrane filter, a flushing water pipeline, a chlorine ion flow cell, a pH flow cell, a first chlorine ion standard solution tank, a second chlorine ion standard solution tank, a first pH standard solution tank, and a second pH standard solution tank.

[0006] The outlet of the desulfurization slurry pipeline is divided into two ways after a desulfurization slurry solenoid valve, one of which is connected with the inlet of the ceramic membrane filter, and the other is connected with a flushing water pipeline through a positive washing water solenoid valve, the flushing water pipeline is connected with the water outlet of the ceramic membrane filter through a backwashing water solenoid valve, the water outlet of the ceramic membrane filter is connected with the inlet of the chloride ion flow cell, the water outlet of the chloride ion flow cell is connected with the inlet of the pH flow cell, the outlet of the first chloride ion standard solution tank and the outlet of the second chloride ion standard solution tank are connected with the inlet of the chloride ion flow cell through a chloride ion standard solution electric pump, and the outlet of the first pH standard solution tank and the outlet of the second pH standard solution tank are connected with the inlet of the pH flow cell through a pH standard solution electric pump.

[0007] The pH selective electrode is arranged in the pH flow cell, and the chloride ion selective electrode is arranged in the chloride ion flow cell.

[0008] The maintenance-free power plant desulfurization slurry key parameter on-line measurement system further improves that:

[0009] Further, the controller is connected with the pH selective electrode and the chloride ion selective electrode through a secondary meter.

[0010] Further, the flushing drainage solenoid valve is arranged at the bottom outlet of the ceramic membrane filter.

[0011] Further, the outlet of the chloride ion flow cell is connected with a drainage pipe, and the drainage pipe is provided with a chloride drainage solenoid valve.

[0012] Further, the water outlet of the chloride ion flow cell is connected with the inlet of the pH flow cell through a pH measurement solenoid valve.

[0013] Further, the water outlet of the ceramic membrane filter is connected with the inlet of the chloride ion flow cell through a chloride ion measurement solenoid valve.

[0014] Further, the outlet of the first chloride ion standard solution tank is connected with the inlet of the chloride ion standard solution electric pump through a first chloride ion standard solution solenoid valve, the outlet of the second chloride ion standard solution tank is connected with the inlet of the chloride ion standard solution electric pump through a second chloride ion standard solution solenoid valve, and the outlet of the chloride ion standard solution electric pump is connected with the inlet of the chloride ion flow cell.

[0015] Further, the outlet of the first pH standard solution tank is connected with the inlet of the pH standard solution electric pump through a first pH standard solution solenoid valve, the outlet of the second pH standard solution tank is connected with the inlet of the pH standard solution electric pump through a second pH standard solution solenoid valve, and the outlet of the pH standard solution electric pump is connected with the inlet of the pH flow cell.

[0016] Further, the controller is connected with the desulfurization slurry solenoid valve, the positive washing water solenoid valve, the flushing drainage solenoid valve, the backwashing water solenoid valve, the chloride ion measurement solenoid valve, the chloride ion standard solution electric pump, the first chloride ion standard solution solenoid valve, the second chloride ion standard solution solenoid valve, the chlorine drainage solenoid valve, the pH measurement solenoid valve, the pH standard solution electric pump, the first pH standard solution solenoid valve and the second pH standard solution solenoid valve.

[0017] The application discloses a kind of maintenance-free power plant desulfurization slurry key parameter on-line measurement method, comprising the following steps:

[0018] Close positive washing water solenoid valve, backwashing water solenoid valve, flushing drainage solenoid valve, first chloride ion standard solution solenoid valve, second chloride ion standard solution solenoid valve, chloride ion standard solution electric pump, chlorine drainage solenoid valve, first pH standard solution solenoid valve, second pH standard solution solenoid valve, pH standard solution electric pump, open desulfurization slurry solenoid valve, chloride ion measurement solenoid valve, pH measurement solenoid valve, desulfurization slurry is filtered by ceramic membrane filter and suspended particles are filtered, filtrate is sequentially measured by chloride ion flow cell and pH flow cell.

[0019] The application has the following beneficial effects:

[0020] The maintenance-free power plant desulfurization slurry key parameter on-line measurement system and method described in the application, when specifically operated, desulfurization slurry is filtered by ceramic membrane filter and suspended particles are filtered, filtrate is sequentially measured by chloride ion flow cell and pH flow cell, realizing on-line measurement of power plant desulfurization slurry chloride ion and pH and automatic maintenance of measurement system, reducing the erosion of particles to electrode through pre-filter, effectively prolonging the service life of electrode, preventing system pipeline blockage by periodically flushing and removing pipeline deposits, ensuring long-term efficient operation of measurement system, automatically checking chloride table and pH table at regular intervals, effectively finding the case that instrument measurement is inaccurate, and based on double-point standard solution closed-loop calibration, ensuring that measurement error is less than given value, effectively improving the measurement accuracy of desulfurization slurry chloride ion and pH, and reducing the operation and maintenance workload of power plant staff. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings accompanying the specification of the application form part hereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application and the explanation thereof serve the purpose of explaining the application, and do not constitute an improper limitation on the application. In the drawings:

[0022] Figure 1 It is a structural diagram of the application.

[0023] Wherein, 1 is a desulfurization slurry solenoid valve, 2 is a positive washing water solenoid valve, 3 is a controller, 4 is a ceramic membrane filter, 5 is a flushing drainage solenoid valve, 6 is a backwashing water solenoid valve, 7 is a chloride ion measurement solenoid valve, 8 is a chloride ion selective electrode, 9 is a chloride ion flow cell, 10 is a chloride ion standard solution electric pump, 11 is a first chloride ion standard solution solenoid valve, 12 is a second chloride ion standard solution solenoid valve, 13 is a first chloride ion standard solution tank, 14 is a second chloride ion standard solution tank, 15 is a chlorine drainage solenoid valve, 16 is a secondary meter, 17 is a pH measurement solenoid valve, 18 is a pH selective electrode, 19 is a pH flow cell, 20 is a pH standard solution electric pump, 21 is a first pH standard solution solenoid valve, 22 is a second pH standard solution solenoid valve, 23 is a first pH standard solution tank, and 24 is a second pH standard solution tank. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] In the description of the present application, it should be understood that the terms "include" and "contain" indicate the existence of described features, whole, steps, operations, elements and / or components, but do not exclude the existence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0026] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, unless otherwise clear from the context, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0027] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0028] It should be understood that, although the terms first, second, third, etc. can be used herein to describe various ranges or elements, these ranges or elements should not be limited by these terms. These terms are only used to distinguish one range or element from another. For example, a first range could be termed a second range without departing from the scope of the embodiments of the present application, similarly, a second range could be termed a first range.

[0029] The word "if" can be interpreted to mean "upon" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [a stated condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining" or "upon detecting [the stated condition or event]" or "in response to detecting [the stated condition or event]," depending on the context.

[0030] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Generally, components of the embodiments of the present application described here and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based upon the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application.

[0031] Various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the drawings. These diagrams are not drawn to scale, in which some details are exaggerated for the purpose of clarity, and some details can be omitted. The shapes of various regions, layers, and their relative sizes and positional relationships shown in the diagrams are only exemplary, and in actuality, they can deviate due to manufacturing tolerances or technical limitations, and a person skilled in the art can additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0032] Reference Figure 1The maintenance-free power plant desulfurization slurry key parameter on-line measuring system comprises a desulfurization slurry electromagnetic valve 1, a positive washing water electromagnetic valve 2, a controller 3, a ceramic membrane filter 4, a flushing drainage electromagnetic valve 5, a backwashing water electromagnetic valve 6, a chloride ion measuring electromagnetic valve 7, a chloride ion selective electrode 8, a chloride ion flow cell 9, a chloride ion standard solution electric pump 10, a first chloride ion standard solution electromagnetic valve 11, a second chloride ion standard solution electromagnetic valve 12, a first chloride ion standard solution storage tank 13, a second chloride ion standard solution storage tank 14, a chloride drainage electromagnetic valve 15, a secondary meter 16, a pH measuring electromagnetic valve 17, a pH selective electrode 18, a pH flow cell 19, a pH standard solution electric pump 20, a first pH standard solution electromagnetic valve 21, a second pH standard solution electromagnetic valve 22, a first pH standard solution storage tank 23 and a second pH standard solution storage tank 24.

[0033] The outlet of the desulfurization slurry pipeline is divided into two routes after the desulfurization slurry electromagnetic valve 1, one of which is connected with the inlet of the ceramic membrane filter 4, and the other is connected with the flushing water pipeline through the positive washing water electromagnetic valve 2, the flushing water pipeline is connected with the water outlet of the ceramic membrane filter 4 through the backwashing water electromagnetic valve 6, the flushing drainage electromagnetic valve 5 is arranged at the bottom outlet of the ceramic membrane filter 4, the water outlet of the ceramic membrane filter 4 is connected with the inlet of the chloride ion flow cell 9 through the chloride ion measuring electromagnetic valve 7, the water outlet of the chloride ion flow cell 9 is connected with the inlet of the pH flow cell 19 through the pH measuring electromagnetic valve 17, the outlet of the chloride ion flow cell 9 is connected with a drainage pipe, the drainage pipe is provided with the chloride drainage electromagnetic valve 15, the outlet of the first chloride ion standard solution storage tank 13 is connected with the inlet of the chloride ion standard solution electric pump 10 through the first chloride ion standard solution electromagnetic valve 11, the outlet of the second chloride ion standard solution storage tank 14 is connected with the inlet of the chloride ion standard solution electric pump 10 through the second chloride ion standard solution electromagnetic valve 12, the outlet of the first pH standard solution storage tank 23 is connected with the inlet of the pH standard solution electric pump 20 through the first pH standard solution electromagnetic valve 21, the outlet of the second pH standard solution storage tank 24 is connected with the inlet of the pH standard solution electric pump 20 through the second pH standard solution electromagnetic valve 22, and the outlet of the pH standard solution electric pump 20 is connected with the inlet of the pH flow cell 19.

[0034] The pH selective electrode 18 is arranged in the pH flow cell 19, the chloride ion selective electrode 8 is arranged in the chloride ion flow cell 9, and the controller 3 is connected with the pH selective electrode 18 and the chloride ion selective electrode 8 through the secondary meter 16.

[0035] The controller 3 is connected with the desulfurization slurry solenoid valve 1, the positive washing water solenoid valve 2, the flushing drainage solenoid valve 5, the backwashing water solenoid valve 6, the chloride ion measurement solenoid valve 7, the chloride ion standard solution electric pump 10, the first chloride ion standard solution solenoid valve 11, the second chloride ion standard solution solenoid valve 12, the chlorine drainage solenoid valve 15, the pH measurement solenoid valve 17, the pH standard solution electric pump 20, the first pH standard solution solenoid valve 21 and the second pH standard solution solenoid valve 22, and the desulfurization slurry solenoid valve 1, the positive washing water solenoid valve 2, the flushing drainage solenoid valve 5, the backwashing water solenoid valve 6, the chloride ion measurement solenoid valve 7, the chloride ion standard solution electric pump 10, the first chloride ion standard solution solenoid valve 11, the second chloride ion standard solution solenoid valve 12, the chlorine drainage solenoid valve 15, the pH measurement solenoid valve 17, the pH standard solution electric pump 20, the first pH standard solution solenoid valve 21 and the second pH standard solution solenoid valve 22 are controlled by the controller 3.

[0036] The maintenance-free power plant desulfurization slurry key parameter on-line measurement method comprises the following steps:

[0037] 1) Measurement stage: close the positive washing water solenoid valve 2, the backwashing water solenoid valve 6, the flushing drainage solenoid valve 5, the first chloride ion standard solution solenoid valve 11, the second chloride ion standard solution solenoid valve 12, the chloride ion standard solution electric pump 10, the chlorine drainage solenoid valve 15, the first pH standard solution solenoid valve 21, the second pH standard solution solenoid valve 22 and the pH standard solution electric pump 20, open the desulfurization slurry solenoid valve 1, the chloride ion measurement solenoid valve 7 and the pH measurement solenoid valve 17, the desulfurization slurry is filtered through the ceramic membrane filter 4 to remove suspended particles, and the filtrate is sequentially measured through the chloride ion flow cell 9 and the pH flow cell 19;

[0038] It should be noted that the desulfurization slurry chloride ion and pH measurement are continuous measurements, and the whole measurement process lasts for 30 min, and then enters the flushing stage;

[0039] 2) Flushing stage: close the desulfurization slurry solenoid valve 1, the backwashing water solenoid valve 6, the chloride ion measurement solenoid valve 7, the first chloride ion standard solution solenoid valve 11, the second chloride ion standard solution solenoid valve 12, the chloride ion standard solution electric pump 10, the chlorine drainage solenoid valve 15, the pH measurement solenoid valve 17, the first pH standard solution solenoid valve 21, the second pH standard solution solenoid valve 22 and the pH standard solution electric pump 20, open the positive washing water solenoid valve 2 and the flushing drainage solenoid valve 5, use the flushing water to wash the ceramic membrane filter 4, then close the positive washing water solenoid valve 2, open the backwashing water solenoid valve 6, and use the flushing water to backwash the ceramic membrane filter 4;

[0040] It should be noted that the whole flushing process lasts for 10 min, wherein the positive washing and backwashing each lasts for 5 min, and then the measurement stage is carried out;

[0041] 3) Chlorine meter calibration phase: close desulfurization slurry solenoid valve 1, positive washing water solenoid valve 2, backwashing water solenoid valve 6, flushing drain solenoid valve 5, chlorine ion measurement solenoid valve 7, pH measurement solenoid valve 17, close second chlorine ion standard solution solenoid valve 12, first pH standard solution solenoid valve 21, second pH standard solution solenoid valve 22, pH standard solution electric pump 20, open first chlorine ion standard solution solenoid valve 11, chlorine ion standard solution electric pump 10, chlorine drain solenoid valve 15, continuously pump chlorine ion standard solution 1 into chlorine ion flow cell 9, after 1 min, controller 3 reads chlorine ion standard solution measurement value 1, then close first chlorine ion standard solution solenoid valve 11, open second chlorine ion standard solution solenoid valve 12, continuously pump chlorine ion standard solution 2 into chlorine ion flow cell 9, after 1 min, controller 3 reads chlorine ion standard solution measurement value 2, and calculates the measurement error of the chlorine meter by the following formula:

[0042]

[0043] Wherein, δ Z is the measurement error of the chlorine meter, S i is the chlorine ion standard solution measurement value, S b is the chlorine ion standard solution value.

[0044] It should be noted that the concentrations of chlorine ion standard solution 1 and chlorine ion standard solution 2 are 5000 ppm and 20000 ppm respectively, and when the measurement error of the chlorine meter in the two times is within the pre-set qualified range, the pH meter calibration phase is entered, otherwise, the chlorine meter is calibrated based on the test results;

[0045] 4) pH meter calibration phase: close desulfurization slurry solenoid valve 1, positive washing water solenoid valve 2, backwashing water solenoid valve 6, flushing drain solenoid valve 5, chlorine ion measurement solenoid valve 7, chlorine drain solenoid valve 15, pH measurement solenoid valve 17, close second pH standard solution solenoid valve 22, first chlorine ion standard solution solenoid valve 11, second chlorine ion standard solution solenoid valve 12, chlorine ion standard solution electric pump 10, open first pH standard solution solenoid valve 21, pH standard solution electric pump 20, continuously pump pH standard solution 1 into pH flow cell 19, after 1 min, controller 3 reads pH standard solution measurement value 1, then close first pH standard solution solenoid valve 21, open second pH standard solution solenoid valve 22, continuously pump pH standard solution 2 into pH flow cell 19, after 1 min, controller 3 reads pH standard solution measurement value 2, and calculates the measurement error of the pH meter by the following formula:

[0046] δ B = S i - S b

[0047] Wherein, δ B is the measurement error of the pH meter, S i is the pH standard solution measurement value, S bThe pH standard solution value.

[0048] It should be noted that the pH values of the pH standard solution 1 and the pH standard solution 2 are 4.00 and 6.86 respectively, when the measurement errors of the pH meter during the two test processes are within the pre-set qualified range, the measurement stage is resumed, otherwise, the chlorine meter is calibrated based on the test results;

[0049] It should be noted that the calibration of the chlorine meter and the pH meter is performed once every other week.

[0050] It should be noted that the present application can realize real-time measurement of slurry chloride ions and pH and periodic maintenance of the system, greatly improving the accuracy of the measurement results and the stability of the measurement system, and reducing the workload of the operation and maintenance personnel.

[0051] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0052] It should be understood that the application is not limited to the precise construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application should only be limited by the appended claims.

[0053] The above is only the preferred embodiment of the present application, not any limitation on the present application, any simple modification, change and equivalent structure change of the above embodiment according to the technical essence of the present application are still within the protection scope of the technical solution of the present application.

Claims

1. A maintenance-free online measurement system for key parameters of desulfurization slurry in power plants, characterized in that, It includes a desulfurization slurry pipeline, a ceramic membrane filter (4), a flushing water pipeline, a chloride ion flow tank (9), a pH flow tank (19), a first chloride ion standard solution storage tank (13), a second chloride ion standard solution storage tank (14), a first pH standard solution storage tank (23), and a second pH standard solution storage tank (24); The outlet of the desulfurization slurry pipeline is divided into two paths after passing through the desulfurization slurry solenoid valve (1). One path is connected to the inlet of the ceramic membrane filter (4), and the other path is connected to the flushing water pipeline via the forward wash water solenoid valve (2). The flushing water pipeline is connected to the outlet of the ceramic membrane filter (4) via the backwash water solenoid valve (6). The outlet of the ceramic membrane filter (4) is connected to the inlet of the chloride ion flow tank (9). The outlet of the chloride ion flow tank (9) is connected to the inlet of the pH flow tank (19). The outlet of the first chloride ion standard solution storage tank (13) and the outlet of the second chloride ion standard solution storage tank (14) are connected to the inlet of the chloride ion flow tank (9) via the chloride ion standard solution electric pump (10). The outlet of the first pH standard solution storage tank (23) and the outlet of the second pH standard solution storage tank (24) are connected to the inlet of the pH flow tank (19) via the pH standard solution electric pump (20). The pH flow cell (19) is equipped with a pH selective electrode (18), and the chloride ion flow cell (9) is equipped with a chloride ion selective electrode (8).

2. The maintenance-free online measurement system for key parameters of desulfurization slurry in power plants according to claim 1, characterized in that, It also includes a controller (3), which is connected to the pH selection electrode (18) and the chloride ion selection electrode (8) via a secondary meter (16).

3. The maintenance-free online measurement system for key parameters of desulfurization slurry in power plants according to claim 2, characterized in that, A flushing drain solenoid valve (5) is provided at the bottom outlet of the ceramic membrane filter (4).

4. The maintenance-free online measurement system for key parameters of desulfurization slurry in power plants according to claim 3, characterized in that, It also includes a drain pipe, the outlet of the chloride ion flow cell (9) is connected to the drain pipe, and the drain pipe is equipped with a chlorine drainage solenoid valve (15).

5. The maintenance-free online measurement system for key parameters of desulfurization slurry in power plants according to claim 4, characterized in that, The outlet of the chloride ion flow cell (9) is connected to the inlet of the pH flow cell (19) via a pH measuring solenoid valve (17).

6. The maintenance-free online measurement system for key parameters of desulfurization slurry in power plants according to claim 5, characterized in that, The outlet of the ceramic membrane filter (4) is connected to the inlet of the chloride ion flow cell (9) via the chloride ion measuring solenoid valve (7).

7. The maintenance-free online measurement system for key parameters of desulfurization slurry in power plants according to claim 6, characterized in that, The outlet of the first chloride ion standard solution storage tank (13) is connected to the inlet of the chloride ion standard solution electric pump (10) via the first chloride ion standard solution solenoid valve (11). The outlet of the second chloride ion standard solution storage tank (14) is connected to the inlet of the chloride ion standard solution electric pump (10) via the second chloride ion standard solution solenoid valve (12). The outlet of the chloride ion standard solution electric pump (10) is connected to the inlet of the chloride ion flow cell (9).

8. The maintenance-free online measurement system for key parameters of desulfurization slurry in power plants according to claim 7, characterized in that, The outlet of the first pH standard solution tank (23) is connected to the inlet of the pH standard solution electric pump (20) via the first pH standard solution solenoid valve (21). The outlet of the second pH standard solution tank (24) is connected to the inlet of the pH standard solution electric pump (20) via the second pH standard solution solenoid valve (22). The outlet of the pH standard solution electric pump (20) is connected to the inlet of the pH flow cell (19).

9. The maintenance-free online measurement system for key parameters of desulfurization slurry in power plants according to claim 8, characterized in that, The controller (3) is connected to the desulfurization slurry solenoid valve (1), the forward wash water solenoid valve (2), the flushing drainage solenoid valve (5), the backwash water solenoid valve (6), the chloride ion measuring solenoid valve (7), the chloride ion standard solution electric pump (10), the first chloride ion standard solution solenoid valve (11), the second chloride ion standard solution solenoid valve (12), the chloride drainage solenoid valve (15), the pH measuring solenoid valve (17), the pH standard solution electric pump (20), the first pH standard solution solenoid valve (21), and the second pH standard solution solenoid valve (22).

10. A maintenance-free online measurement method for key parameters of desulfurization slurry in power plants, characterized in that, The maintenance-free online measurement system for key parameters of desulfurization slurry in power plants according to claim 9 includes the following steps: Close the forward wash water solenoid valve (2), backwash water solenoid valve (6), flushing drain solenoid valve (5), first chloride ion standard solution solenoid valve (11), second chloride ion standard solution solenoid valve (12), chloride ion standard solution electric pump (10), chloride drain solenoid valve (15), first pH standard solution solenoid valve (21), second pH standard solution solenoid valve (22), and pH standard solution electric pump (20). Open the desulfurization slurry solenoid valve (1), chloride ion measuring solenoid valve (7), and pH measuring solenoid valve (17). The desulfurization slurry is filtered through the ceramic membrane filter (4) to remove suspended particles. The filtrate is then measured sequentially through the chloride ion flow cell (9) and the pH flow cell (19).

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