Online measurement and calibration system for pH and density of desulfurization slurry of power plant

Abstract

The invention discloses a power plant desulfurization slurry pH and density on-line measurement and calibration system which is characterized in that an outlet of a desulfurization slurry inlet valve and an outlet of a cleaning water inlet valve are combined through a pipeline and then are divided into two paths, one path is communicated with an inlet of a # 1 pH measurement buffer tank through a slurry inlet valve of the # 1 pH measurement buffer tank, and the other path is communicated with an outlet of a # 2 pH measurement buffer tank through a slurry outlet valve of the # 2 pH measurement buffer tank; the other path is communicated with a # 2 densimeter through a # 1 densimeter slurry inlet valve, a # 1 densimeter and a # 2 densimeter slurry inlet valve; a # 1 pH electrode and a # 2 pH electrode are inserted into the # 1 pH measurement buffer tank, an outlet in the side face of the top of the # 1 pH measurement buffer tank is communicated with an inlet of the # 2 pH measurement buffer tank, a # 3 pH electrode is inserted into the # 2 pH measurement buffer tank, and the system guarantees the measurement accuracy of the pH meter and the densitometer and is long in service life.

Description

Technical Field

[0001] The invention belongs to the field of water quality monitoring of power generation technology, and relates to an online measurement and calibration system for pH and density of desulfurization slurry in a power plant. Background Art

[0002] Flue gas treatment is one of the important means for my country to solve air quality problems and promote green economic development. At present, the limestone-gypsum wet flue gas desulfurization process is the most widely used desulfurization technology. In order to ensure the safe and reliable operation of the entire desulfurization system, a large number of instruments are required to detect various parameters of the system. The absorption tower is the core equipment of the wet flue gas desulfurization process. The density and pH value of the desulfurization slurry in the tower are important bases for judging the operation of the desulfurization tower and the corresponding operation adjustments of the operators, which are closely related to the desulfurization efficiency and the stable operation of the system.

[0003] At present, the pH and density in the desulfurization slurry are monitored online by online pH meters and online density meters. Most desulfurization slurry pH meters are direct-insertion type, that is, the pH electrode is directly inserted into the measured slurry pipeline. The concentrated slurry contains a large amount of limestone particles and other solid impurities, and the flow rate is very high, which will cause serious scouring damage to the pH electrode. The pH meter has low measurement accuracy and requires frequent manual calibration. The electrode life is short and the electrode needs to be replaced frequently. Generally, the electrode needs to be replaced every 3-5 months. The operating cost is high, which is not conducive to the efficient, economical and safe operation of the desulfurization system. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an online measurement and calibration system for pH and density of desulfurization slurry in a power plant, which ensures the accuracy of measurement of pH meter and density meter and has a long service life.

[0005] To achieve the above-mentioned purpose, the present invention discloses an online measurement and calibration system for pH and density of desulfurization slurry in a power plant, including a desulfurization slurry inlet valve, a cleaning water inlet valve, a #1 pH measurement buffer tank slurry inlet valve, a #1 pH measurement buffer tank, a #1 density meter slurry inlet valve, a #1 density meter, a #2 density meter slurry inlet valve, a #2 density meter and a #2 pH measurement buffer tank;

[0006] The outlet of the desulfurization slurry inlet valve and the outlet of the cleaning water inlet valve are connected through a pipeline and divided into two routes, one of which is connected to the inlet of the #1 pH measurement buffer tank through the #1 pH measurement buffer tank slurry inlet valve, and the other is connected to the #2 density meter through the #1 density meter slurry inlet valve, the #1 density meter and the #2 density meter slurry inlet valve;

[0007] #1pH electrode and #2pH electrode are inserted into #1pH measurement buffer tank, the outlet on the top side of #1pH measurement buffer tank is connected with the inlet of #2pH measurement buffer tank, and #3pH electrode is inserted into #2pH measurement buffer tank.

[0008] The further improvement of the on-line measurement and calibration system for pH and density of desulfurization slurry in power plant of the present invention is:

[0009] Furthermore, it also includes a controller, which is connected to the #1 pH electrode, the #2 pH electrode, the #3 pH electrode, the #1 density meter and the #2 density meter.

[0010] Furthermore, the controller is connected to a pH and density multi-parameter measurement display.

[0011] Furthermore, it also includes a #1 density meter slurry outlet valve, which is connected to the pipeline between the #1 density meter and the #2 density meter slurry inlet valve.

[0012] Furthermore, a #1pH measurement buffer tank bottom drain valve is provided at the bottom outlet of the #1pH measurement buffer tank.

[0013] Furthermore, the outlet on the top side of the #1 pH measurement buffer tank is connected to the inlet of the #2 pH measurement buffer tank via the #2 pH measurement buffer tank slurry inlet valve.

[0014] Furthermore, a #2pH measurement buffer tank bottom drain valve is provided at the bottom outlet of the #2pH measurement buffer tank.

[0015] Furthermore, it also includes a slurry outlet valve of the #1pH measurement buffer tank, which is connected to a pipeline between the slurry inlet valve of the #2pH measurement buffer tank and the outlet on the top side of the #1pH measurement buffer tank.

[0016] The power plant desulfurization slurry pH and density online measurement and calibration system of the present invention comprises a desulfurization slurry inlet valve, a cleaning water inlet valve, a #1 pH measurement buffer tank slurry inlet valve, a #1 pH measurement buffer tank, a #1 density meter slurry inlet valve, a #1 density meter, a #2 density meter slurry inlet valve, a #2 density meter and a #2 pH measurement buffer tank;

[0017] The outlet of the desulfurization slurry inlet valve and the outlet of the cleaning water inlet valve are connected through a pipeline and divided into two routes, one of which is connected to the inlet of the #1 pH measurement buffer tank through the #1 pH measurement buffer tank slurry inlet valve, and the other is connected to the #2 density meter through the #1 density meter slurry inlet valve, the #1 density meter and the #2 density meter slurry inlet valve;

[0018] A #1pH electrode and a #2pH electrode are inserted into the #1pH measurement buffer tank, an outlet on the top side of the #1pH measurement buffer tank is connected to an inlet of the #2pH measurement buffer tank, and a #3pH electrode is inserted into the #2pH measurement buffer tank;

[0019] Also included is a controller, which is connected to the #1 pH electrode, the #2 pH electrode, the #3 pH electrode, the #1 density meter, and the #2 density meter;

[0020] It also includes a #1 pH measurement buffer tank slurry outlet valve, which is connected to a pipeline between the #2 pH measurement buffer tank slurry inlet valve and the outlet on the top side of the #1 pH measurement buffer tank.

[0021] The further improvement of the on-line measurement and calibration system for pH and density of desulfurization slurry in power plant of the present invention is:

[0022] Furthermore, the controller is connected to a pH and density multi-parameter measurement display.

[0023] The present invention has the following beneficial effects:

[0024] During specific operation, the online measurement and calibration system for pH and density of desulfurization slurry in a power plant described in the present invention uses the pH value measured by the #3 pH electrode as a standard value for comparison with the #1 pH electrode and the #2 pH electrode. When the error exceeds a preset range, the instrument is automatically calibrated. The data measured by the #2 density meter is used as a standard value for comparison with the measured data measured by the #1 density meter. When the error exceeds a preset range, the instrument is automatically calibrated. At the same time, flushing water is introduced to clean the management and the instrument, thereby ensuring the accuracy of the pH meter and the density meter measurements and having a long service life.

[0025] Furthermore, by setting up a pH measurement buffer tank, the impact of desulfurization slurry on the pH electrode can be reduced, the service life of the electrode can be extended, and the measurement accuracy of the instrument can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the present invention.

[0027] Among them, 1 is the desulfurization slurry inlet valve, 2 is the cleaning water inlet valve, 3 is the #1 pH measurement buffer tank slurry inlet valve, 4 is the #1 pH measurement buffer tank, 5 is the #1 pH electrode, 6 is the #2 pH electrode, 7 is the #1 pH measurement buffer tank bottom drain valve, 8 is the #1 pH measurement buffer tank slurry outlet valve, 9 is the #2 pH measurement buffer tank slurry inlet valve, 10 is the #2 pH measurement buffer tank, 11 is the #3 pH electrode, 12 is the #2 pH measurement buffer tank bottom drain valve, 13 is the #1 density meter slurry inlet valve, 14 is the #1 density meter, 15 is the #1 density meter slurry outlet valve, 16 is the #2 density meter slurry inlet valve, 17 is the #2 density meter, 18 is the pH and density multi-parameter measurement display, and 19 is the controller. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0030] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0031] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to 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: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0032] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0033] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0036] Embodiment 1

[0037] The power plant desulfurization slurry pH and density online measurement and calibration system of the present invention comprises a desulfurization slurry inlet valve 1, a cleaning water inlet valve 2, a #1 pH measurement buffer tank slurry inlet valve 3, a #1 pH measurement buffer tank 4, a #1 density meter slurry inlet valve 13, a #1 density meter 14, a #2 density meter slurry inlet valve 16, a #2 density meter 17 and a #2 pH measurement buffer tank 10; the outlet of the desulfurization slurry inlet valve 1 and the outlet of the cleaning water inlet valve 2 are connected by a pipeline and then divided into two paths, one of which is connected to the inlet of the #1 pH measurement buffer tank 4 through the #1 pH measurement buffer tank slurry inlet valve 3, and the other is connected to the #2 density meter 17 through the #1 density meter slurry inlet valve 13, the #1 density meter 14 and the #2 density meter slurry inlet valve 16; A #1 pH electrode 5 and a #2 pH electrode 6 are inserted into the #1 pH measurement buffer tank 4, the outlet on the top side of the #1 pH measurement buffer tank 4 is connected to the inlet of the #2 pH measurement buffer tank 10, and a #3 pH electrode 11 is inserted into the #2 pH measurement buffer tank 10; it also includes a controller 19, the controller 19 is connected to the #1 pH electrode 5, the #2 pH electrode 6, the #3 pH electrode 11, the #1 density meter 14 and the #2 density meter 17; it also includes a #1 pH measurement buffer tank slurry outlet valve 8, the #1 pH measurement buffer tank slurry outlet valve 8 is connected to the pipeline between the #2 pH measurement buffer tank slurry inlet valve 9 and the outlet on the top side of the #1 pH measurement buffer tank 4, and the controller 19 is connected to a pH and density multi-parameter measurement display 18.

[0038] Embodiment 2

[0039] refer to Figure 1 The power plant desulfurization slurry pH and density online measurement and calibration system of the present invention comprises a desulfurization slurry inlet valve 1, a cleaning water inlet valve 2, a #1 pH measurement buffer tank slurry inlet valve 3, a #1 pH measurement buffer tank 4, a #1 pH electrode 5, a #2 pH electrode 6, a #1 pH measurement buffer tank bottom drain valve 7, a #1 pH measurement buffer tank slurry outlet valve 8, a #2 pH measurement buffer tank slurry inlet valve 9, a #2 pH measurement buffer tank 10, a #3 pH electrode 11, a #2 pH measurement buffer tank bottom drain valve 12, a #1 density meter slurry inlet valve 13, a #1 density meter 14, a #1 density meter slurry outlet valve 15, a #2 density meter slurry inlet valve 16, a #2 density meter 17, a pH and density multi-parameter measurement display 18 and a controller 19;

[0040] The outlet of the desulfurization slurry inlet valve 1 and the outlet of the cleaning water inlet valve 2 are connected by a pipeline and divided into two paths, one of which is connected to the inlet of the #1 pH measurement buffer tank 4 through the #1 pH measurement buffer tank slurry inlet valve 3, and the other is connected to the #2 density meter 17 through the #1 density meter slurry inlet valve 13, the #1 density meter 14 and the #2 density meter slurry inlet valve 16; the #1 density meter slurry outlet valve 15 is connected to the pipeline between the #1 density meter 14 and the #2 density meter slurry inlet valve 16.

[0041] #1pH electrode 5 and #2pH electrode 6 are inserted into #1pH measuring buffer tank 4, a #1pH measuring buffer tank bottom drain valve 7 is provided at the bottom outlet of #1pH measuring buffer tank 4, the outlet on the top side of #1pH measuring buffer tank 4 is connected with the inlet of #2pH measuring buffer tank 10 via #2pH measuring buffer tank slurry inlet valve 9, a #3pH electrode 11 is inserted into #2pH measuring buffer tank 10, and a #2pH measuring buffer tank bottom drain valve 12 is provided at the bottom outlet of #2pH measuring buffer tank 10.

[0042] As an embodiment of the present invention, the #1 pH measurement buffer tank slurry outlet valve 8 is connected to the #2 pH measurement buffer tank slurry inlet valve 9 and the pipeline between the outlet on the top side of the #1 pH measurement buffer tank 4 .

[0043] As an embodiment of the present invention, the controller 19 is connected to the pH and density multi-parameter measurement display 18, the #1 pH electrode 5, the #2 pH electrode 6, the #3 pH electrode 11, the #1 density meter 14 and the #2 density meter 17, and the data collected by the #1 pH electrode 5, the #2 pH electrode 6, the #3 pH electrode 11, the #1 density meter 14 and the #2 density meter 17 are obtained through the controller 19.

[0044] Embodiment 3

[0045] The present embodiment discloses a method for online measurement and calibration of pH and density of desulfurization slurry in a power plant. The method is implemented based on the system for online measurement and calibration of pH and density of desulfurization slurry in a power plant. The system for online measurement and calibration of pH and density of desulfurization slurry in a power plant comprises a desulfurization slurry inlet valve 1, a cleaning water inlet valve 2, a slurry inlet valve 3 of a #1 pH measurement buffer tank, a #1 pH measurement buffer tank 4, a #1 pH electrode 5, a #2 pH electrode 6, a bottom drain valve 7 of a #1 pH measurement buffer tank, a slurry outlet valve 8 of a #1 pH measurement buffer tank, a slurry inlet valve 9 of a #2 pH measurement buffer tank, a #2 pH measurement buffer tank 10, a #3 pH electrode 11, a bottom drain valve 12 of a #2 pH measurement buffer tank, a slurry inlet valve 13 of a #1 density meter, a #1 density meter 14, a slurry outlet valve 15 of a #1 density meter, a slurry inlet valve 16 of a #2 density meter, a pH and density multi-parameter measurement display 18 and a controller 19.

[0046] Specifically, the method for online measurement and calibration of pH and density of desulfurization slurry in a power plant comprises the following steps:

[0047] During operation, the desulfurization slurry inlet valve 1 is opened, the cleaning water inlet valve 2 is closed, the slurry inlet valve 3 of the #1 pH measurement buffer tank is opened, the bottom sewage valve 7 of the #1 pH measurement buffer tank is closed, the slurry outlet valve 8 of the #1 pH measurement buffer tank is opened, and the slurry inlet valve 9 of the #2 pH measurement buffer tank is closed. The desulfurization slurry enters the #1 pH measurement buffer tank 4 from the lower left through the slurry inlet valve 3 of the #1 pH measurement buffer tank, and the pH value of the slurry is measured through the #1 pH electrode 5 and the #2 pH electrode 6. The measurement data is transmitted to the pH and density multi-parameter measurement display 18. After the measurement, the slurry is discharged through the slurry outlet valve 8 of the #1 pH measurement buffer tank, and the pH measurement of the desulfurization slurry is completed. The slurry inlet valve 13 of the #1 density meter is opened, the density of the desulfurization slurry is measured through the #1 density meter 14, and the measurement data is transmitted to the pH and density multi-parameter measurement display 18. After the measurement, the slurry is discharged through the slurry outlet valve 15 of the #1 density meter, and the density measurement of the desulfurization slurry is completed.

[0048] This system can be controlled to operate in continuous or intermittent measurement mode. Taking intermittent measurement as an example, the measurement time is set to 5 minutes, the cleaning time is 1 minute, and the residence time is 10 minutes, that is, the opening time of the desulfurization slurry inlet valve 1 is 5 minutes. After 5 minutes, the desulfurization slurry inlet valve 1 is closed, the cleaning water inlet valve 2 is opened, and the bottom drain valve 7 of the #1 pH measurement buffer tank is opened. The other valve states remain unchanged to achieve the cleaning of the pH measurement buffer tank, pH electrode and density meter. After cleaning for 1 minute, the cleaning water inlet valve 2 is closed to end the cleaning. Keep in this state for 10 minutes. After 10 minutes, the measurement program is automatically started and the above measurement and cleaning process is repeated. After each measurement of intermittent measurement, the pH meter and density meter are cleaned to avoid damage to the instrument caused by long-term flushing of the desulfurization slurry and improve the measurement accuracy of the instrument.

[0049] The system can set a regular calibration time. When the system reaches the set calibration time, the automatic calibration program will be automatically started. At this time, the desulfurization slurry inlet valve 1 is opened, the cleaning water inlet valve 2 is closed, the #1pH measurement buffer tank slurry inlet valve 3 is opened, the #1pH measurement buffer tank bottom drain valve 7 is closed, the #1pH measurement buffer tank slurry outlet valve 8 is closed, the #2pH measurement buffer tank slurry inlet valve 9 is opened, and the #2pH measurement buffer tank bottom drain valve 12 is closed. The desulfurization slurry enters the #1pH measurement buffer tank 4 from the lower left through the #1pH measurement buffer tank slurry inlet valve 3, and the slurry pH is measured by the #1pH electrode 5 and the #2pH electrode 6, and the measurement data is transmitted to the pH and density multi-parameter measurement display 18. After the measurement, the slurry enters the #2pH measurement buffer tank 10 through the #2pH measurement buffer tank slurry inlet valve 9, and the slurry pH is measured by the #3pH electrode 11, and the measurement data is transmitted to the pH and density multi-parameter measurement display 18. The pH value measured by the #3pH electrode 11 is compared with the #1pH electrode 5 and the #2pH electrode 6 as the standard value. When the error exceeds the preset range, the instrument is automatically calibrated. Similarly, the #1 densitometer slurry inlet valve 13 is opened, the desulfurization slurry density is measured through the #1 densitometer 14, and the measured data is transmitted to the pH and density multi-parameter measurement display 18. After the measurement, the slurry enters the #2 densitometer 17 through the #2 densitometer slurry inlet valve 16 to measure the slurry density, and the measured data is transmitted to the pH and density multi-parameter measurement display 18. The measured data of the #2 densitometer 17 is used as the standard value to compare with the measured data of the #1 densitometer 14. When the error exceeds the preset range, the instrument is automatically calibrated. After the calibration is completed, the cleaning program is automatically started to clean the #1 pH measurement buffer tank 4, the #1 pH electrode 5, the #2 pH electrode 6, the #2 pH measurement buffer tank 10, the #3 pH electrode 11, the #1 densitometer 14 and the #2 densitometer 17. After the cleaning is completed, the measurement program is automatically entered.

[0050] It should be noted that by setting up a pH measurement buffer tank, the impact of desulfurization slurry on the pH electrode can be reduced, the service life of the electrode can be extended, and the measurement accuracy of the instrument can be improved.

[0051] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0052] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An online measurement and calibration system for pH and density of desulfurization slurry in a power plant, characterized in that: It comprises a desulfurization slurry inlet valve (1), a cleaning water inlet valve (2), a #1 pH measurement buffer tank slurry inlet valve (3), a #1 pH measurement buffer tank (4), a #1 density meter slurry inlet valve (13), a #1 density meter (14), a #2 density meter slurry inlet valve (16), a #2 density meter (17) and a #2 pH measurement buffer tank (10); The outlet of the desulfurization slurry inlet valve (1) and the outlet of the cleaning water inlet valve (2) are connected through a pipeline and then divided into two paths, one of which is connected to the inlet of the #1 pH measurement buffer tank (4) through the #1 pH measurement buffer tank slurry inlet valve (3), and the other is connected to the #2 density meter (17) through the #1 density meter slurry inlet valve (13), the #1 density meter (14) and the #2 density meter slurry inlet valve (16); A #1 pH electrode (5) and a #2 pH electrode (6) are inserted into the #1 pH measurement buffer tank (4); an outlet on the top side of the #1 pH measurement buffer tank (4) is connected to an inlet of a #2 pH measurement buffer tank (10); and a #3 pH electrode (11) is inserted into the #2 pH measurement buffer tank (10).

2. The on-line measurement and calibration system for pH and density of desulfurization slurry in power plant according to claim 1 is characterized in that: The device also includes a controller (19), which is connected to the #1 pH electrode (5), the #2 pH electrode (6), the #3 pH electrode (11), the #1 density meter (14) and the #2 density meter (17).

3. The on-line measurement and calibration system for pH and density of desulfurization slurry in power plant according to claim 2 is characterized in that: The controller (19) is connected to a pH and density multi-parameter measurement display (18).

4. The on-line measurement and calibration system for pH and density of desulfurization slurry in power plant according to claim 1 is characterized in that: It also includes a #1 density meter slurry outlet valve (15), which is connected to the pipeline between the #1 density meter (14) and the #2 density meter slurry inlet valve (16).

5. The on-line measurement and calibration system for pH and density of desulfurization slurry in power plant according to claim 1, characterized in that: A #1 pH measurement buffer tank bottom drain valve (7) is provided at the bottom outlet of the #1 pH measurement buffer tank (4).

6. The on-line measurement and calibration system for pH and density of desulfurization slurry in power plant according to claim 1, characterized in that: The outlet on the top side of the #1 pH measurement buffer tank (4) is connected to the inlet of the #2 pH measurement buffer tank (10) via the #2 pH measurement buffer tank slurry inlet valve (9).

7. The on-line measurement and calibration system for pH and density of desulfurization slurry in power plant according to claim 1, characterized in that: A #2pH measurement buffer tank bottom drain valve (12) is provided at the bottom outlet of the #2pH measurement buffer tank (10).

8. The on-line measurement and calibration system for pH and density of desulfurization slurry in power plant according to claim 1, characterized in that: It also includes a #1 pH measurement buffer tank slurry outlet valve (8), which is connected to a pipeline between a #2 pH measurement buffer tank slurry inlet valve (9) and an outlet on the top side of the #1 pH measurement buffer tank (4).

9. An online measurement and calibration system for pH and density of desulfurization slurry in a power plant, characterized in that: It comprises a desulfurization slurry inlet valve (1), a cleaning water inlet valve (2), a #1 pH measurement buffer tank slurry inlet valve (3), a #1 pH measurement buffer tank (4), a #1 density meter slurry inlet valve (13), a #1 density meter (14), a #2 density meter slurry inlet valve (16), a #2 density meter (17) and a #2 pH measurement buffer tank (10); The outlet of the desulfurization slurry inlet valve (1) and the outlet of the cleaning water inlet valve (2) are connected through a pipeline and then divided into two paths, one of which is connected to the inlet of the #1 pH measurement buffer tank (4) through the #1 pH measurement buffer tank slurry inlet valve (3), and the other is connected to the #2 density meter (17) through the #1 density meter slurry inlet valve (13), the #1 density meter (14) and the #2 density meter slurry inlet valve (16); A #1 pH electrode (5) and a #2 pH electrode (6) are inserted into the #1 pH measurement buffer tank (4); an outlet on the top side of the #1 pH measurement buffer tank (4) is connected to an inlet of the #2 pH measurement buffer tank (10); and a #3 pH electrode (11) is inserted into the #2 pH measurement buffer tank (10); It also includes a controller (19), which is connected to the #1 pH electrode (5), the #2 pH electrode (6), the #3 pH electrode (11), the #1 density meter (14) and the #2 density meter (17); It also includes a #1 pH measurement buffer tank slurry outlet valve (8), which is connected to a pipeline between a #2 pH measurement buffer tank slurry inlet valve (9) and an outlet on the top side of the #1 pH measurement buffer tank (4).

10. The on-line measurement and calibration system for pH and density of desulfurization slurry in power plant according to claim 9, characterized in that: The controller (19) is connected to a pH and density multi-parameter measurement display (18).

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