Intelligent water quality standard recognition system and method for chemical supervision during startup

Abstract

The present invention discloses a water quality intelligent identification system and method for chemical supervision during the startup phase. The sample water intelligent switching unit is connected to the inlet of a laser particle counter, the outlet of the laser particle counter is connected to one end of a first valve, one end of a second valve and one end of a third valve, the other end of the first valve is connected to a fourth valve, the other end of the second valve is connected to the inlet of an online full iron analyzer, the outlet of the online full iron analyzer is connected to the fourth valve, the other end of the third valve is connected to the inlet of an online conductivity meter and the inlet of an online hardness meter, the outlet of the online hardness meter is connected to the fourth valve, the outlet of the online conductivity meter is connected to the inlet of an online pH meter, and the outlet of the online pH meter is connected to the fourth valve. The system and method can realize water quality identification at each key node during the startup phase, and ensure the timeliness and accuracy of chemical supervision.

Description

Technical Field

[0001] The present invention belongs to the field of chemical online monitoring and control of power plants, and relates to an intelligent water quality standard recognition system and method for chemical supervision during the startup phase. Background Art

[0002] Scientific and reliable chemical monitoring ensures the efficient operation of thermal power generating units. Water quality monitoring during the startup phase is a key component of chemical monitoring in power plants. When inadequate monitoring results in units being started blindly without meeting water vapor quality standards, large amounts of silicon and iron compounds can deposit on the heating surfaces. This not only affects heat transfer efficiency and reduces boiler efficiency, but can also cause corrosion and overheating tube bursts, causing irreversible damage to power plant equipment. Currently, with green and renewable energy being prioritized, frequent startups of thermal power units have become the new norm for thermal power plants. Therefore, the importance of chemical monitoring during unit startup is even more crucial.

[0003] During the startup phase, water quality indicators such as conductivity, pH, silica, sodium, total iron, and hardness must be monitored throughout the entire process. This allows for the identification of appropriate timing for condensate recovery and the completion of cold and hot flushes, ensuring that water quality meets the requirements for boiler ignition, turbine connection, and start-up. Surveys have shown that many power plants frequently start units before water quality meets standards. The slow response time of traditional manual sampling and testing is one of the main reasons for inadequate chemical monitoring during startup. For example, the determination of total iron requires boiling, digesting, and cooling the water sample before testing, which takes 40 to 60 minutes. Therefore, most power plants limit water quality testing to every two hours. This results in a 2-4 hour delay in operators determining whether water quality meets standards, wasting hundreds of tons of high-quality demineralized water for flushing. Even more seriously, when units are rushed into operation due to tight grid connection deadlines, operators are unable to respond to real-time water quality conditions, creating safety risks for the unit equipment. In addition, for test and laboratory personnel, even with the above test frequency, the workload is enormous, and the experimental work during the unit startup process has already overwhelmed them.

[0004] In order to solve the above problems, it is urgent to research and develop a water quality intelligent identification system for chemical supervision during the startup phase, to achieve rapid identification of water quality at key nodes during the startup phase, to ensure the timeliness and accuracy of chemical supervision, to reduce the probability of irreversible damage to boiler equipment due to chemical reasons, and at the same time to significantly shorten the startup time, reduce the startup flushing water consumption, and greatly reduce the testing workload of personnel, thus bringing considerable power generation benefits, water saving benefits and social benefits to the power plant. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a water quality intelligent identification system and method for chemical supervision during the startup phase. The system and method can realize water quality identification at each key node during the startup phase and ensure the timeliness and accuracy of chemical supervision.

[0006] To achieve the above-mentioned object, the water quality standard-compliant intelligent identification system for chemical supervision in the startup phase of the present invention comprises a multi-parameter online rapid water quality detection unit and a sample water intelligent switching unit, wherein the multi-parameter online rapid water quality detection unit comprises a laser particle counter, an online total iron analyzer, an online conductivity meter, an online pH meter, an online hardness meter, a first valve, a second valve, a third valve, and a fourth valve;

[0007] The sample water intelligent switching unit is connected to the inlet of the laser particle counter, the outlet of the laser particle counter is connected to one end of the first valve, one end of the second valve and one end of the third valve, the other end of the first valve is connected to the fourth valve, the other end of the second valve is connected to the inlet of the online total iron analyzer, the outlet of the online total iron analyzer is connected to the fourth valve, the other end of the third valve is connected to the inlet of the online conductivity meter and the inlet of the online hardness tester, the outlet of the online hardness tester is connected to the fourth valve, the outlet of the online conductivity meter is connected to the inlet of the online pH meter, and the outlet of the online pH meter is connected to the fourth valve.

[0008] The sample water intelligent switching unit is a six-inlet and one-outlet multi-way valve.

[0009] It also includes a control system, wherein the control system is connected to the sample water intelligent switching unit, the first valve, the second valve, the third valve and the fourth valve.

[0010] The third valve is connected to the inlet of the online conductivity meter and the inlet of the online hardness tester through a precision filter.

[0011] The method for intelligently identifying water quality compliance for chemical monitoring during the startup phase of the present invention comprises the following steps:

[0012] After the water sample enters the multi-parameter water quality online rapid detection unit, the first valve and the fourth valve are opened, and the number of particles in different particle size ranges in the water sample is detected online using a laser particle counter;

[0013] When the number of particulate matter in the water sample reaches the preset value, close the first valve and open the second and third valves at the same time. Use the online total iron analyzer, online conductivity meter, online pH meter and online hardness meter to detect the total iron content, conductivity, pH and hardness in the water sample to identify the water quality of the water sample.

[0014] The water sample passes through a precision filter to remove suspended impurities, and then enters the first valve, the second valve and the third valve.

[0015] It also includes: regularly flushing the multi-parameter water quality online rapid detection unit.

[0016] The present invention has the following beneficial effects:

[0017] The intelligent water quality identification system and method for chemical supervision during the startup phase described in the present invention, during specific operation, first utilizes a laser method to accurately measure the number of particles in different particle size ranges in the sample water online in real time. When the number of particles reaches a preset value, the total iron content, conductivity, pH and hardness of the sample water are then detected. This not only enables rapid and accurate identification of water quality at key nodes during the startup phase, but also reduces a large amount of unnecessary manual testing workload. It should be noted that the present invention can ensure the timeliness and accuracy of chemical supervision during the startup phase, reduce the probability of irreversible damage to boiler equipment due to chemical reasons, and at the same time significantly shorten the startup time, reduce startup flushing water consumption, and significantly reduce the testing workload of personnel, bringing considerable power generation and water-saving benefits to the power plant. It has a high degree of automation, does not require human intervention, and is extremely practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Among them, 1 is a multi-parameter online rapid water quality detection unit, 1-1 is a laser particle counter, 1-2 is an online total iron analyzer, 1-3 is a precision filter, 1-4 is an online conductivity meter, 1-5 is an online pH meter, 1-6 is an online hardness meter, 2 is a sample water intelligent switching unit, 3 is a control system, 4 is the first valve, 5 is the second valve, 6 is the third valve, and 7 is the fourth valve. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0021] The accompanying drawings illustrate schematic diagrams of the structures of the disclosed embodiments of the present invention. These figures are not drawn to scale; for the purpose of clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0022] refer to Figure 1 The water quality intelligent recognition system for chemical supervision in the startup stage described in the present invention includes a multi-parameter water quality online rapid detection unit 1, a sample water intelligent switching unit 2 and a control system 3; the multi-parameter water quality online rapid detection unit 1 includes a laser particle counter 1-1, an online total iron analyzer 1-2, a precision filter 1-3, an online conductivity meter 1-4, an online pH meter 1-5, an online hardness tester 1-6, a first valve 4, a second valve 5, a third valve 6 and a fourth valve 7.

[0023] The outlet of the laser particle counter 1-1 is connected to one end of the first valve 4, one end of the second valve 5 and one end of the third valve 6, the other end of the first valve 4 is connected to the fourth valve 7, the other end of the second valve 5 is connected to the inlet of the online total iron analyzer 1-2, the outlet of the online total iron analyzer 1-2 is connected to the fourth valve 7, the other end of the third valve 6 is connected to the inlet of the online conductivity meter 1-4 and the inlet of the online hardness tester 1-6 through the precision filter 1-3, the outlet of the online hardness tester 1-6 is connected to the fourth valve 7, the outlet of the online conductivity meter 1-4 is connected to the inlet of the online pH meter 1-5, and the outlet of the online pH meter 1-5 is connected to the fourth valve 7.

[0024] The sample water intelligent switching unit 2 is connected to the inlet of the laser particle counter 1-1.

[0025] It should be noted that the sample water intelligent switching unit 2 in the present invention is a six-input and one-output multi-way valve; the control system 3 is connected to the sample water intelligent switching unit 2, the first valve 4, the second valve 5, the third valve 6 and the fourth valve 7.

[0026] The method for intelligently identifying water quality compliance for chemical monitoring during the startup phase of the present invention comprises the following steps:

[0027] 1) According to the chemical supervision strategy during the startup phase, the control system 3 controls the water sample intelligent switching unit 2 to allow water samples at different key nodes during the startup phase to enter the multi-parameter water quality online rapid detection unit 1 to test the water quality of the water samples;

[0028] 2) When a certain water sample enters the multi-parameter water quality online rapid detection unit 1, the control system 3 opens the first valve 4 and the fourth valve 7, and uses the laser particle counter 1-1 to online detect the number of particles within different particle size ranges in the water sample, thereby realizing rapid identification of the water quality profile of the water sample;

[0029] 3) When the number of particulate matter in the water sample reaches a preset value, the control system 3 closes the first valve 4 and simultaneously opens the second valve 5 and the third valve 6. The online total iron analyzer 1-2, the online conductivity meter 1-4, the online pH meter 1-5 and the online hardness meter 1-6 are used to detect the total iron content, conductivity, pH and hardness in the water sample, ultimately achieving accurate identification of the water quality of the water sample. In this process, the precision filter 1-3 is used to remove suspended impurities in the water sample, reducing the impact of impurities on the accurate detection of indicators such as conductivity, pH and hardness, and on the other hand, it also helps to extend the service life of the instrument electrodes;

[0030] 4) After the unit is put into operation normally, the chemical supervision of the startup phase ends. At this time, the control system 3 controls the sample water intelligent switching unit 2 to allow the flushing water to enter the multi-parameter water quality online rapid detection unit 1, and simultaneously opens the first valve 4, the second valve 5, the third valve 6 and the fourth valve 7 to fully flush the measuring pipeline; when the flushing reaches the preset time, the fourth valve 7 is closed, the water quality meets the standard, and the intelligent identification system stops operating.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. An intelligent water quality recognition system for chemical supervision during the startup phase, characterized by: The invention comprises a multi-parameter water quality online rapid detection unit (1) and a water sample intelligent switching unit (2), wherein the multi-parameter water quality online rapid detection unit (1) comprises a laser particle counter (1-1), an online total iron analyzer (1-2), an online conductivity meter (1-4), an online pH meter (1-5), an online hardness meter (1-6), a first valve (4), a second valve (5), a third valve (6) and a fourth valve (7); The sample water intelligent switching unit (2) is connected to the inlet of the laser particle counter (1-1); the outlet of the laser particle counter (1-1) is connected to one end of the first valve (4), one end of the second valve (5) and one end of the third valve (6); the other end of the first valve (4) is connected to the fourth valve (7); the other end of the second valve (5) is connected to the inlet of the online full iron analyzer (1-2); the outlet of the online full iron analyzer (1-2) is connected to the fourth valve (7); the other end of the third valve (6) is connected to the inlet of the online conductivity meter (1-4) and the inlet of the online hardness meter (1-6); the outlet of the online hardness meter (1-6) is connected to the fourth valve (7); the outlet of the online conductivity meter (1-4) is connected to the inlet of the online pH meter (1-5); and the outlet of the online pH meter (1-5) is connected to the fourth valve (7).

2. The water quality standard-compliant intelligent identification system for chemical supervision during the startup phase according to claim 1 is characterized in that: The sample water intelligent switching unit (2) is a multi-way valve with six inlets and one outlet.

3. The water quality standard-compliant intelligent identification system for chemical supervision during the startup phase according to claim 1 is characterized in that: It also includes a control system (3), wherein the control system (3) is connected to the sample water intelligent switching unit (2), the first valve (4), the second valve (5), the third valve (6) and the fourth valve (7).

4. The water quality standard-compliant intelligent identification system for chemical supervision during the startup phase according to claim 1 is characterized in that: The third valve (6) is connected to the inlet of the online conductivity meter (1-4) and the inlet of the online hardness tester (1-6) via the precision filter (1-3).

5. An intelligent water quality identification method for chemical supervision during the startup phase, characterized in that: The following steps are involved: After the water sample enters the multi-parameter water quality online rapid detection unit (1), the first valve (4) and the fourth valve (7) are opened, and the number of particles within different particle size ranges in the water sample is detected online using a laser particle counter (1-1); When the amount of particulate matter in the water sample reaches a preset value, the first valve (4) is closed, and the second valve (5) and the third valve (6) are opened at the same time, and the total iron content, conductivity, pH and hardness in the water sample are detected by an online total iron analyzer (1-2), an online conductivity meter (1-4), an online pH meter (1-5) and an online hardness meter (1-6), so as to identify the water quality of the water sample.

6. The method for intelligently identifying water quality compliance for chemical supervision during the startup phase according to claim 5 is characterized in that: The water sample passes through precision filters (1-3) to remove suspended impurities, and then enters the first valve (4), the second valve (5) and the third valve (6).

7. The method for intelligently identifying water quality compliance for chemical monitoring during startup according to claim 5 is characterized in that: Also includes: The multi-parameter water quality online rapid detection unit (1) is flushed regularly.

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