Mobile machine stopping and starting water quality multi-parameter monitoring system and method

Abstract

The system comprises a manual sampling port, an overflow cup, a degassing hydrogen conductivity meter, an electrochemical pH regulation and control device, an optical measurement system, a medicine tank, a buffer solution storage tank and a color developing agent storage tank, the manual sampling port is communicated with an inlet of the overflow cup, and an outlet of the overflow cup is communicated with an inlet of the degassing hydrogen conductivity meter through the first sampling pump, the conductivity meter, the electric regeneration cation exchange device, the hydrogen conductivity meter and the degassing system; an outlet of the overflow cup is communicated with an inlet of an anode area in the electrochemical pH regulation and control device through a second sample injection pump, an outlet of the anode area in the electrochemical pH regulation and control device is communicated with an inlet of the optical measurement system through a dissolving oxidizer, and the system and the method can realize cooperative monitoring of multiple key water quality indexes in the machine stopping and starting process.

Description

Technical Field

[0001] This invention belongs to the field of power plant water sample monitoring technology, and relates to a mobile multi-parameter monitoring system and method for power plant start-stop water quality. Background Technology

[0002] Under the background of new power systems, power plants face problems such as deep peak shaving and frequent shutdowns and restarts. During shutdown and restart, it is necessary to promptly understand key indicators such as corrosive anions (characterized by hydrogen conductivity), corrosion products (characterized by total iron content), and pH to guide the adjustment of water conditions. Currently, hydrogen conductivity is measured using traditional ion exchange resin columns with conductivity meters. During the shutdown and restart phase, a high-flow-rate, long-duration flushing of the system is required to obtain stable measurement values. Even in laboratories with ion chromatographs, samples need to be taken back to the laboratory for offline measurement, which is prone to sample contamination and results in significant measurement lag. During the shutdown and restart phase, the total iron content in water vapor varies widely, ranging from 10 to 1000 μg / L. Generally, samples are taken back to the laboratory, acid-cooked, and then measured using graphite furnace atomic absorption or spectrophotometry. The wide range requires the selection of different measurement conditions or procedures. During the shutdown and restart phase, it is necessary to promptly obtain the total iron data of the water sample to guide the adjustment of water conditions, but the slow measurement speed cannot meet the requirements on site. In addition, the pH of water is a key indicator for corrosion prevention and control, and the inaccuracy of potentiometric pH measurement during the shutdown and restart phase is also a prominent problem. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mobile water quality multi-parameter monitoring system and method for start-up and shutdown, which can achieve coordinated monitoring of multiple key water quality indicators during start-up and shutdown.

[0004] To achieve the above objectives, this invention discloses a mobile start-stop water quality multi-parameter monitoring system, including a manual sampling port, an overflow cup, a degassed hydrogen conductivity meter, an electrochemical pH control device, an optical measurement system, a medicine tank, a buffer solution storage tank, and a colorimetric reagent storage tank. The manual sampling port is connected to the inlet of the overflow cup, and the outlet of the overflow cup is connected to the inlet of the degassed hydrogen conductivity meter via the first injection pump, conductivity meter, electro-regeneration cation exchange device, hydrogen conductivity meter and degassing system. The outlet of the overflow cup is connected to the inlet of the anode area in the electrochemical pH control device via the second injection pump, and the outlet of the anode area in the electrochemical pH control device is connected to the inlet of the optical measurement system via the dissolution oxidizer. The outlet of the medicine tank is connected to the inlet of the packing layer in the electrochemical pH control device via the outlet of the circulating pump, and the outlet of the packing layer in the electrochemical pH control device is connected to the inlet of the medicine tank; the outlet of the buffer solution storage tank is connected to the inlet of the optical measurement system via the cathode area in the electrochemical pH control device and the first dosing pump; the outlet of the colorimetric reagent storage tank is connected to the inlet of the optical measurement system via the second dosing pump.

[0005] Furthermore, it also includes a sewage outlet, the outlet of which is connected to the outlet of the degassed hydrogen conductivity meter.

[0006] Furthermore, it also includes a sewage pump, the outlet of which is connected to the sewage pump.

[0007] Furthermore, the electrochemical pH control device includes an anode region, a packing layer, and a cathode region, wherein the anode region and the packing layer are separated by an anion exchange membrane, and the cathode region and the packing layer are separated by a cation exchange membrane.

[0008] Furthermore, it also includes a first control system, which is connected to a conductivity meter, a hydrogen conductivity meter, and a degassed hydrogen conductivity meter.

[0009] Furthermore, it also includes a second control system, which is connected to the electrochemical pH control device, the dissolution oxidizer, the first dosing pump, the second dosing pump, and the sewage pump.

[0010] This invention discloses a method for monitoring multiple parameters of water quality in a mobile start-stop system, comprising the following steps: The flowing water sample from the manual sampling port enters the overflow cup. Excess water sample overflows and is discharged. The flowing water sample in the overflow cup is drawn by the first and second sampling pumps. One of the water samples is driven by the first sampling pump to the conductivity meter to measure the specific conductivity, and then enters the electro-regeneration cation exchange device to remove cations. Then it enters the hydrogen conductivity meter to measure the hydrogen conductivity. Subsequently, it enters the degassing system to remove inorganic carbonates from the water. The water effluent from the degassing system enters the degassing hydrogen conductivity meter to measure the degassing hydrogen conductivity. Another water sample enters the anode zone of the electrochemical pH control device via a second injection pump to adjust the pH of the water sample. It then enters the dissolving oxidizer to convert colloidal iron in the water into dissolved iron before entering the optical measurement system. The colorimetric reagent from the colorimetric reagent storage tank is added to the optical measurement system via a first dosing pump. The buffer solution from the buffer solution storage tank is added to the optical measurement system via a second dosing pump and the cathode zone of the electrochemical pH control device. The water sample, colorimetric reagent, and buffer solution react in the optical measurement system. Based on the measured photoelectric signal, the total iron content of the water sample is calculated.

[0011] Furthermore, the pH and ammonia content of the water sample were calculated based on the measurements from the conductivity meter and the hydrogen conductivity meter.

[0012] Furthermore, the CO2 content of the water sample was calculated based on the measured values ​​from the hydrogen conductivity meter and the degassed hydrogen conductivity meter.

[0013] Furthermore, the photoelectric signal is directly proportional to the total iron content of the water sample.

[0014] The present invention has the following beneficial effects: In practical operation, the mobile start-stop system and method for water quality multi-parameter monitoring described in this invention involves moving the equipment to the on-site steam and water sampling room. Water samples from the manual sampling port are collected in two streams from the overflow cup. One stream enters the multi-parameter collaborative measurement system, where conductivity, hydrogen conductivity, and degassed hydrogen conductivity are measured sequentially. Based on the measured values, pH, ammonia content, and CO2 content are calculated. The other stream of water sample enters the total iron measurement system under certain flow conditions, and sequentially passes through an electrochemical pH control device for sample acidification, avoiding the conventional method of adding hydrochloric acid. The process involves cleaning and acidifying the water sample. After acidification, the colloidal iron in the water sample is completely converted to a dissolved state by a dissolving oxidizer before being quantitatively introduced into the optical measurement system. This avoids conventional sampling, acidification, and boiling steps, and is a prerequisite for online monitoring of total iron. After the colloidal iron in the water sample is dissolved and converted, it enters the optical measurement system. A colorimetric system based on ferric sulfosalicylate is constructed by adding a colorimetric agent. The same measurement system can meet the measurement requirements of (0-1000) μg / L total iron in water samples, avoiding the problems of switching optical paths required by atomic absorption and photometry to meet measurement sensitivity. This invention allows a single instrument to perform comprehensive monitoring of multiple key water quality indicators, quickly and accurately diagnose water quality conditions during start-up and shutdown processes, and facilitates power plant operators to accurately judge water quality conditions through multiple indicators and promptly guide water condition adjustments, ensuring the safe and economical operation of thermal equipment. Attached Figure Description

[0015] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a structural diagram of the present invention.

[0016] Among them, 1 is the manual sampling port, 2 is the overflow cup, 3 is the first injection pump, 4 is the conductivity meter, 5 is the electro-regeneration cation exchange device, 6 is the hydrogen conductivity meter, 7 is the degassing system, 8 is the degassing hydrogen conductivity meter, 9 is the first control system, 10 is the electrochemical pH control device, 11 is the dissolution oxidizer, 12 is the optical measurement system, 13 is the first dosing pump, 14 is the second dosing pump, 15 is the colorimetric reagent storage tank, 16 is the buffer solution storage tank, 17 is the sewage pump, 18 is the second control system, 19 is the second injection pump, 20 is the reagent tank, and 21 is the circulation pump. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0019] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0020] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0021] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. 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.

[0022] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0025] refer to Figure 1 The mobile start-stop water quality multi-parameter monitoring system of the present invention includes a manual sampling port 1, an overflow cup 2, a first sampling pump 3, a conductivity meter 4, an electro-regeneration cation exchange device 5, a hydrogen conductivity meter 6, a degassing system 7, a degassing hydrogen conductivity meter 8, a first control system 9, an electrochemical pH adjustment device 10, a dissolving oxidizer 11, an optical measurement system 12, a first dosing pump 13, a second dosing pump 14, a colorimetric reagent storage tank 15, a buffer solution storage tank 16, a sewage pump 17, a second control system 18, a second sampling pump 19, a reagent tank 20, and a circulation pump 21. The manual sampling port 1 is connected to the inlet of the overflow cup 2. The outlet of the overflow cup 2 is connected to the inlet of the degassed hydrogen conductivity meter 8 via the first injection pump 3, conductivity meter 4, electro-regeneration cation exchange device 5, hydrogen conductivity meter 6 and degassing system 7. The outlet of the degassed hydrogen conductivity meter 8 is connected to the sewage outlet.

[0026] The outlet of overflow cup 2 is connected to the inlet of the anode region of electrochemical pH control device 10 via the second injection pump 19, and the outlet of the anode region of electrochemical pH control device 10 is connected to the inlet of optical measurement system 12 via dissolution oxidizer 11.

[0027] The outlet of the medicine tank 20 is connected to the inlet of the packing layer in the electrochemical pH control device 10 via the outlet of the circulation pump 21, and the outlet of the packing layer in the electrochemical pH control device 10 is connected to the inlet of the medicine tank 20; the outlet of the buffer solution storage tank 16 is connected to the inlet of the optical measurement system 12 via the cathode area in the electrochemical pH control device 10 and the first dosing pump 13; the outlet of the colorimetric reagent storage tank 15 is connected to the inlet of the optical measurement system 12 via the second dosing pump 14, and the outlet of the optical measurement system 12 is connected to the sewage pump 17.

[0028] The first control system 9 is connected to the conductivity meter 4, the hydrogen conductivity meter 6, and the degassed hydrogen conductivity meter 8.

[0029] The second control system 18 is connected to the electrochemical pH control device 10, the dissolution oxidizer 11, the first dosing pump 13, the second dosing pump 14, and the sewage pump 17.

[0030] The mobile start-stop water quality multi-parameter monitoring method of the present invention includes the following steps: The flowing water sample from the manual sampling port 1 continuously enters the overflow cup 2. Excess water sample overflows and is discharged. The flowing water sample from the overflow cup 2 is drawn in by the first sampling pump 3 and the second sampling pump 19, and enters the measurement system in two paths. One path of the water sample is driven by the first sampling pump 3 into the conductivity meter 4 to measure the specific conductivity, then enters the electro-regeneration cation exchange device 5 to remove cations such as ammonium, and then enters the hydrogen conductivity meter 6 to measure the hydrogen conductivity. Subsequently, it enters the degassing system 7 to remove inorganic carbonates from the water. The effluent from the degassing system 7 enters the degassed hydrogen conductivity meter 8 to measure the degassed hydrogen conductivity. The first control system 9 controls the input and output signals of the first sampling pump 3, conductivity meter 4, electro-regeneration cation exchange device 5, hydrogen conductivity meter 6, and degassed hydrogen conductivity meter 8. The other path of the water sample enters the anode area of ​​the electrochemical pH control device 10 through the second sampling pump 19 to adjust the pH of the water sample, and then enters the... The dissolved oxidizer 11 converts colloidal iron in the water into dissolved iron, which then enters the optical measurement system 12. The colorimetric reagent output from the colorimetric reagent storage tank 15 is added to the optical measurement system 12 through the first dosing pump 13. The buffer solution output from the buffer solution storage tank 16 is added to the optical measurement system 12 through the second dosing pump 14 and the cathode area of ​​the electrochemical pH control device 10. The water sample, colorimetric reagent, and buffer solution react in the optical measurement system 12. The measured photoelectric signal is transmitted to the second control system 18. The photoelectric detection signal is proportional to the total iron content of the water sample. The total iron content of the water sample is calculated and displayed. Finally, the reaction solution is discharged through the sewage pump 17. The first control system 18 controls the input and output signals of the electrochemical pH control device 10, the dissolved oxidizer 11, the optical measurement system 12, the first dosing pump 13, the second dosing pump 14, the sewage pump 17, and the second sample injection pump 19.

[0031] This invention can be moved to different water and steam measurement points in the power plant and connected to different manual sampling ports 1. After the water sample enters the overflow cup 2, it is sequentially passed through the conductivity meter 4, hydrogen conductivity meter 6, and degassed hydrogen conductivity meter 8 to measure the conductivity, hydrogen conductivity, and degassed hydrogen conductivity, respectively. The pH and ammonia content of the water sample are calculated based on the measured values ​​of the conductivity meter 4 and hydrogen conductivity meter 6, and the CO2 content of the water sample is calculated based on the measured values ​​of the hydrogen conductivity meter 6 and degassed hydrogen conductivity meter 8, thus completing the coordinated and rapid measurement of multiple indicators during the start-up and shutdown process.

[0032] The electrochemical pH control device 10 includes an anode region, a packing layer, and a cathode region. The anode region and the packing layer are separated by an anion exchange membrane, and the cathode region and the packing layer are separated by a cation exchange membrane. The chloride salt solution in the medicine tank 20 enters the packing layer through the circulation pump 21 and then returns to the medicine tank 20.

[0033] The buffer solution enters the cathode area of ​​the electrochemical pH control device 10 through the second dosing pump 14. After the strong base is added, a pH control solution consisting of strong base and buffer solution is formed. Then, the optical measurement system 12 is added, which can quickly and accurately adjust the pH of the reaction solution to the optimal pH range.

[0034] The working process of this invention is as follows: 1) Move the present invention to the site, connect the flowing water sample from the manual sampling port 1 to the overflow cup 2, discharge the excess water sample after overflow, and draw the flowing water sample from the overflow cup 2 through the first sampling pump 3 and the second sampling pump 19, and send it into the multi-parameter collaborative measurement system and the total iron measurement system in two separate paths.

[0035] One water sample enters the conductivity meter 4 through the first injection pump 3 to measure the specific conductivity, then enters the electro-regeneration cation exchange device 5 to remove cations such as ammonium, and then enters the hydrogen conductivity meter 6 to measure the hydrogen conductivity. After the hydrogen conductivity is measured, the water sample then enters the degassing system 7 to remove CO2 from the water, and then enters the degassing hydrogen conductivity meter 8 to measure the degassing hydrogen conductivity.

[0036] The first control system 18 receives measurement signals from the conductivity, hydrogen conductivity, and degassed hydrogen conductivity tables 8 and displays the measured values. It then calculates the pH and ammonia content of the water sample based on the measured conductivity and hydrogen conductivity values, and calculates the CO2 content of the water sample based on the measured hydrogen conductivity and degassed hydrogen conductivity values, thus completing the coordinated and rapid measurement of multiple indicators during the start-up and shutdown process.

[0037] After the measurement is completed, the values ​​of conductivity, hydrogen conductivity, degassed hydrogen conductivity, pH, ammonia content, and CO2 content are displayed.

[0038] The process for measuring total iron is as follows: The flow rate of the second injection pump 19 is controlled to be V1, and the sample is drawn from the overflow cup 2 at time t1. After passing through the anode area of ​​the electrochemical pH control device 10 and the dissolution oxidizer 11, the sample enters the optical measurement system 12 and is stirred and rinsed before being discharged through the sewage pump 17. The above steps are repeated to further rinse the entire measurement system.

[0039] Optical measurement steps: The second sample pump 19 is controlled to have a flow rate of V2, and the sample is drawn from the overflow cup 2 at time t2. The sample is then acidified by passing through the anode region of the electrochemical pH control device 10, making the pH value of the sample water less than 2. After acidification, the water sample passes through the dissolution oxidizer 11, where colloidal iron is completely converted to a dissolved state under the action of light waves of a specific wavelength and intensity. The sample is then quantitatively introduced into the optical measurement system 12. After stirring evenly, the lamp current of the optical measurement system 12 is adjusted to maintain a constant voltage value of V0. A colorimetric reagent is added to the optical measurement system 12 via the first dosing pump 13. After stirring evenly, the second dosing pump 14 is started, and the buffer solution is added to the optical measurement system 12 after passing through the cathode region of the electrochemical pH control device 10. A chemical reaction takes place within the system for a certain period, and the resulting photovoltage signal V1 is input to the second control system 18 for calculation to determine the total iron content of the water sample. After the reaction is complete, the second control system 18 activates the drain pump 17 to empty the water sample from the optical measurement system 12.

[0040] The specific principle of the electrochemical pH control device 10 for acidifying water samples is as follows: the electrochemical pH control device 10, the circulating pump 21, and the reagent tank 20 together constitute an online acid generation system. The electrochemical pH control device 10 consists of a cathode area, an intermediate packing layer, and an anode area. The cathode area and the intermediate packing layer are separated by a cation exchange membrane, and the anode area and the intermediate packing layer are separated by an anion exchange membrane. The reagent tank 20 contains a chloride ion salt solution. The chloride ion salt solution in the reagent tank 20 provides chloride ions and H+ ions ionized from the anode area to the anode area through the intermediate packing layer of the electrochemical pH control device 10. + It constitutes HCl, provides cations to the cathode region, and OH groups ionized in the cathode region. - A strong alkali is formed. The chloride salt solution in tank 20 flows through the packing layer via circulating pump 21 and returns to tank 20. The water sample passes through the anode zone at a certain flow rate V2. The HCl generated in the anode zone is added to the water sample to adjust the pH to below 2. The flow rate Vx and the pH of the water sample are related as follows: pH = aV x 3 + bV x 2 +cV x +d The higher the flow rate Vx, the higher the pH value of the water sample; the lower the flow rate Vx, the lower the pH value of the water sample. The reaction determines that the water sample obtains a suitable pH value by passing through the anode at a flow rate V2.

[0041] In addition, the buffer solution flows through the cathode region of the electrochemical pH control device 10 at a certain flow rate via the second dosing pump 14. The strong alkaline solution generated in the cathode region and the buffer solution constitute a buffer system based on a strong alkaline matrix. With the addition of the optical measurement system 12, the pH of the reaction solution can be quickly and accurately adjusted to the required range, thus providing both rapid and precise buffering.

[0042] Water samples containing colloidal iron converted to dissolved iron are introduced into optical measurement system 12. After adding colorimetric reagent A and buffer solution B to the water sample, a colorimetric system based on ferric sulfosalicylate is constructed. This same measurement system can meet the measurement requirements for total iron concentrations of (0-1000) μg / L in water samples. The photovoltage signal V0 before dosing and the photovoltage signal V after dosing are measured. X The difference X and the total iron content Y in the water sample show the following correlation: Y=e1x 2 +e2x+e0 The greater the difference in photovoltage signals, the higher the total iron content of the water sample; the smaller the difference in photovoltage signals, the lower the total iron content of the water sample. The invention is characterized by an optical measurement system 12 that can meet the measurement of (0-1000) μg / L total iron, with a wide range.

[0043] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0044] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0045] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A mobile start-stop system for monitoring multiple water quality parameters, characterized in that, It includes a manual sampling port (1), an overflow cup (2), a degassed hydrogen conductivity meter (8), an electrochemical pH control device (10), an optical measurement system (12), a medicine tank (20), a buffer solution storage tank (16), and a colorimetric reagent storage tank (15). The manual sampling port (1) is connected to the inlet of the overflow cup (2), and the outlet of the overflow cup (2) is connected to the inlet of the degassing hydrogen conductivity meter (8) via the first injection pump (3), conductivity meter (4), electro-regenerative cation exchange device (5), hydrogen conductivity meter (6) and degassing system (7). The outlet of the overflow cup (2) is connected to the inlet of the anode area in the electrochemical pH control device (10) via the second injection pump (19), and the outlet of the anode area in the electrochemical pH control device (10) is connected to the inlet of the optical measurement system (12) via the dissolution oxidizer (11). The outlet of the medicine tank (20) is connected to the inlet of the packing layer in the electrochemical pH control device (10) via the outlet of the circulation pump (21), and the outlet of the packing layer in the electrochemical pH control device (10) is connected to the inlet of the medicine tank (20); the outlet of the buffer solution storage tank (16) is connected to the inlet of the optical measurement system (12) via the cathode area in the electrochemical pH control device (10) and the first dosing pump (13); the outlet of the colorimetric reagent storage tank (15) is connected to the inlet of the optical measurement system (12) via the second dosing pump (14).

2. The mobile start-stop water quality multi-parameter monitoring system according to claim 1, characterized in that, It also includes a sewage outlet, and the outlet of the degassing hydrogen conductivity table (8) is connected to the sewage outlet.

3. The mobile start-stop water quality multi-parameter monitoring system according to claim 1, characterized in that, It also includes a sewage pump (17), and the outlet of the optical measurement system (12) is connected to the sewage pump (17).

4. The mobile start-stop water quality multi-parameter monitoring system according to claim 1, characterized in that, The electrochemical pH control device (10) includes an anode region, a packing layer and a cathode region, wherein the anode region and the packing layer are separated by an anion exchange membrane and the cathode region and the packing layer are separated by a cation exchange membrane.

5. The mobile start-stop water quality multi-parameter monitoring system according to claim 1, characterized in that, It also includes a first control system (9), which is connected to a conductivity meter (4), a hydrogen conductivity meter (6) and a degassed hydrogen conductivity meter (8).

6. The mobile start-stop water quality multi-parameter monitoring system according to claim 1, characterized in that, It also includes a second control system (18), which is connected to an electrochemical pH control device (10), a dissolution oxidizer (11), a first dosing pump (13), a second dosing pump (14), and a sewage pump (17).

7. A method for monitoring multiple parameters of water quality in a mobile start-stop system, characterized in that, The mobile start-stop water quality multi-parameter monitoring system according to claim 1 includes the following steps: The flowing water sample from the manual sampling port (1) enters the overflow cup (2). The excess water sample overflows and is discharged. The flowing water sample in the overflow cup (2) is drawn by the first sampling pump (3) and the second sampling pump (19). One of the water samples is driven by the first sampling pump (3) into the conductivity meter (4) to measure the specific conductivity. Then it enters the electro-regeneration cation exchange device (5) to remove cations. Then it enters the hydrogen conductivity meter (6) to measure the hydrogen conductivity. After that, it enters the degassing system (7) to remove inorganic carbonates from the water. The water from the degassing system (7) enters the degassing hydrogen conductivity meter (8) to measure the degassing hydrogen conductivity. Another water sample enters the anode area of ​​the electrochemical pH control device (10) through the second injection pump (19) to regulate the pH of the water sample, and then enters the dissolution oxidizer (11) to convert colloidal iron in the water into dissolved iron before entering the optical measurement system (12). The colorimetric reagent output from the colorimetric reagent storage tank (15) is added to the optical measurement system (12) through the first dosing pump (13). The buffer solution output from the buffer solution storage tank (16) is added to the optical measurement system (12) through the second dosing pump (14) and the cathode area of ​​the electrochemical pH control device (10). The water sample, colorimetric reagent and buffer solution react in the optical measurement system (12). The total iron content of the water sample is calculated based on the measured photoelectric signal.

8. The mobile start-stop system water quality multi-parameter monitoring method according to claim 7, characterized in that, The pH and ammonia content of the water sample were calculated based on the measured values ​​from the conductivity table (4) and the hydrogen conductivity table (6).

9. The mobile start-stop system water quality multi-parameter monitoring method according to claim 7, characterized in that, The CO2 content of the water sample was calculated based on the measured values ​​from the hydrogen conductivity table (6) and the degassed hydrogen conductivity table (8).

10. The mobile start-stop system water quality multi-parameter monitoring method according to claim 7, characterized in that, The photoelectric signal is directly proportional to the total iron content of the water sample.

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