Boiler water quality monitoring device

Abstract

The utility model relates to industrial boiler water quality detection technical field, is a kind of boiler water quality monitoring device, it includes first sample cup, pH value detection equipment, calibration column, phosphate radical analyzer, conductivity detection equipment, sodium ion detection equipment, first sample cup, pH value detection equipment import respectively fixed intercommunication have first, second sampling pipeline, fixed intercommunication have sample pipeline between first sample cup and calibration column, fixed intercommunication have reagent pipeline between reagent tank and calibration column, fixed intercommunication have mixed solution pipeline between calibration column export and phosphate radical analyzer, sample pipeline, reagent pipeline, mixed solution pipeline, desalted water pipeline are respectively installed with peristaltic pump. The utility model is reasonable and compact, convenient to use, its operation time is controlled to peristaltic pump by PLC controller, and each detection equipment's digital display screen is monitored in real time by online monitoring camera, reach the purpose of on-line detection boiler water quality, with safe, labor-saving, simple, efficient characteristics.

Description

Technical Field

[0001] This utility model relates to the field of industrial boiler water quality testing technology, and is a boiler water quality monitoring device. Background Technology

[0002] In the operation of large coal-fired boilers such as coal-fired boilers in thermal power plants and circulating fluidized bed boilers in heavy oil thermal recovery steam injection stations in oil fields, boiler water quality monitoring, especially the detection of phosphate ions, pH, boiler water conductivity, and sodium ions in steam in boiler feedwater, is particularly critical.

[0003] The loose sludge (calcium phosphate / magnesium phosphate) formed by the reaction of phosphates (such as Na3PO4) with calcium and magnesium ions in boiler water can prevent hard scale from depositing on the heating surface. The ferric phosphate formed by the reaction of phosphates and iron forms a passivation protective film on the metal surface, which is used for scale control and passivation protection in boilers and to inhibit corrosion of pipelines and equipment. If the acidity or alkalinity of boiler feedwater is too high or too low, it can easily lead to corrosion or caustic embrittlement. The content of impurities in boiler water can be determined based on the conductivity test results, so as to control the blowdown and prevent scaling and steam-water azeotropy. Sodium ions are common cations in boiler water. The sodium ion content in steam (steam generated by the boiler) is one of the most sensitive indicators for judging the degree of boiler water pollution carried by steam (steam-water azeotropy or mechanical carry-over).

[0004] Boiler water quality must be routinely tested every four hours. Currently, boiler water quality monitoring and analysis are primarily done manually. After sampling the boiler water, personnel take samples to a specialized laboratory for testing phosphate, pH, conductivity, and sodium ions. However, the boiler water quality monitoring process suffers from the following problems: low efficiency and timeliness of manual testing; reliance on operator experience for reagent preparation and operational standardization, leading to significant human error; fragmented monitoring of multiple parameters, making data integration difficult; and lack of process monitoring, making it impossible to trace the testing process. Summary of the Invention

[0005] This utility model provides a boiler water quality monitoring device that overcomes the shortcomings of the prior art. It can effectively solve the problems of time lag, large human error, difficulty in integrating multi-parameter data, and lack of traceability in the existing boiler water quality monitoring process.

[0006] The technical solution of this utility model is achieved through the following measures: A boiler water quality monitoring device includes a first sample cup, a pH value detection device, a calibration column, a reagent tank, and a phosphate analyzer. The inlet of the first sample cup is fixedly connected to a first sampling pipeline. A second sampling pipeline is fixedly connected between the first sampling pipeline and the inlet of the pH value detection device. A sample pipeline is fixedly connected between the outlet of the first sample cup and the upper inlet of the calibration column. A reagent pipeline is fixedly connected between the outlet of the reagent tank and the lower inlet of the calibration column. A mixed liquid pipeline is fixedly connected between the outlet of the calibration column and the upper inlet of the phosphate analyzer. A demineralized water pipeline is fixedly connected to the top inlet of the phosphate analyzer. A first sewage pipeline is fixedly connected to the bottom outlet of the phosphate analyzer. A second sewage pipeline is fixedly connected between the outlet of the pH value detection device and the first sewage pipeline.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] The sample pipeline, reagent pipeline, mixed solution pipeline, and demineralized water pipeline are respectively equipped with a first peristaltic pump, a second peristaltic pump, a third peristaltic pump, and a fourth peristaltic pump.

[0009] The pH testing device mentioned above includes a second sample cup and a pH meter. The pH meter is fixed by a first bracket and inserted into the second sample cup.

[0010] The inlet pipelines of the first, second, third, and fourth peristaltic pumps are respectively fixedly equipped with a first metering column, a second metering column, a third metering column, and a fourth metering column.

[0011] The above also includes a conductivity testing device. The inlet of the conductivity testing device is fixedly connected to a third sampling pipeline. The bottom outlet of the conductivity testing device is fixedly connected to a third sewage pipeline. The conductivity testing device includes a third sample cup and a conductivity analyzer. The conductivity analyzer is fixed by a second bracket and inserted into the third sample cup.

[0012] The above also includes a sodium ion detection device. The top inlet of the sodium ion detection device is fixedly connected to a steam condensate pipeline, and a desuperheater and pressure reducer are fixedly installed on the steam condensate pipeline. The bottom outlet of the sodium ion detection device is fixedly connected to a fourth sewage pipeline between the first sewage pipeline and the third sewage pipeline. The sodium ion detection device includes a fourth sample cup and a sodium meter. The sodium meter is fixed by a third bracket and inserted into the fourth sample cup.

[0013] The aforementioned phosphate analyzer, pH meter, conductivity analyzer, and sodium meter are respectively equipped with an analytical digital display screen, a first digital display screen, a second digital display screen, and a third digital display screen.

[0014] The above also includes a PLC controller, an online monitoring camera, and the first, second, third, and fourth peristaltic pumps are all electrically connected to the PLC controller. There is one or more online monitoring cameras, which are used to monitor the digital display screen, the first digital display screen, the second digital display screen, and the third digital display screen of the phosphate analyzer.

[0015] This utility model has a reasonable and compact structure and is easy to use. It controls the running time of the peristaltic pump through a PLC controller, while an online monitoring camera monitors the digital display screens of each detection device in real time, so as to achieve the purpose of online detection of boiler water quality, ensuring that the boiler water quality meets relevant requirements, preventing boiler corrosion, scaling, salt accumulation, and steam pollution, thereby ensuring the safe, efficient, and economical operation of the boiler. It has the characteristics of safety, labor saving, simplicity, and high efficiency. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the process flow of this utility model.

[0017] Appendix Figure 2 This is a schematic diagram of the pH value detection device in this utility model.

[0018] Appendix Figure 3 This is a schematic diagram of the conductivity testing equipment of this utility model.

[0019] Appendix Figure 4 This is a schematic diagram of the sodium ion detection device of this utility model.

[0020] Appendix Figure 1 The codes in the diagram are as follows: 1 for the first sample cup, 2 for the pH detection device, 3 for the calibration column, 4 for the reagent tank, 5 for the phosphate analyzer, 6 for the first sampling line, 7 for the second sampling line, 8 for the sample line, 9 for the reagent line, 10 for the mixed solution line, 11 for the demineralized water line, 12 for the first wastewater line, 13 for the second wastewater line, 14 for the first peristaltic pump, 15 for the second peristaltic pump, 16 for the third peristaltic pump, 17 for the fourth peristaltic pump, 18 for the conductivity detection device, 19 for the third sampling line, 20 for the third wastewater line, 21 for the sodium ion detection device, 22 for the steam condensate line, 23 for the desuperheater and pressure reducer, and 24 for the fourth wastewater line.

[0021] Appendix Figure 2 The codes in the code are as follows: 25 is the second sample cup, 26 is the pH meter, 27 is the first support, and 28 is the first digital display screen.

[0022] Appendix Figure 3 The codes are as follows: 29 is the third sample cup, 30 is the conductivity analyzer, 31 is the second support, and 32 is the second digital display screen.

[0023] Appendix Figure 4 The codes are as follows: 33 is the fourth sample cup, 34 is the sodium meter, 35 is the third support, and 36 is the third digital display screen. Detailed Implementation

[0024] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0025] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.

[0026] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0027] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0028] Example 1: As shown in the attached document Figure 1 As shown, the boiler water quality monitoring device includes a first sample cup 1, a pH value detection device 2, a calibration column 3, a reagent tank 4, and a phosphate analyzer 5. The inlet of the first sample cup 1 is fixedly connected to a first sampling pipeline 6. The first sampling pipeline 6 and the inlet of the pH value detection device 2 are fixedly connected to a second sampling pipeline 7. The outlet of the first sample cup 1 and the upper inlet of the calibration column 3 are fixedly connected to a sample pipeline 8. The outlet of the reagent tank 4 and the lower inlet of the calibration column 3 are fixedly connected to a reagent pipeline 9. The outlet of the calibration column 3 and the upper inlet of the phosphate analyzer 5 are fixedly connected to a mixed liquid pipeline 10. The top inlet of the phosphate analyzer 5 is fixedly connected to a demineralized water pipeline 11. The bottom outlet of the phosphate analyzer 5 is fixedly connected to a first sewage pipeline 12. The outlet of the pH value detection device 2 and the first sewage pipeline 12 are fixedly connected to a second sewage pipeline 13.

[0029] The above-mentioned boiler water quality monitoring device can be further optimized and / or improved according to actual needs:

[0030] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 As shown, a first peristaltic pump 14, a second peristaltic pump 15, a third peristaltic pump 16, and a fourth peristaltic pump 17 are respectively fixedly installed on the sample line 8, the reagent line 9, the mixed solution line 10, and the demineralized water line 11.

[0031] In this invention, boiler feedwater enters the first sample cup 1 and pH detection device 2 through the first sampling pipeline 6 and the second sampling pipeline 7, respectively. The first peristaltic pump 14 extracts the boiler feedwater sample from the first sample cup 1, and the second peristaltic pump 15 extracts the vanadium molybdate solution from the reagent tank 4. The samples are then sent to the calibration column 3 for mixing. The resulting mixture is then sent to the phosphate analyzer 5 by the third peristaltic pump 16. The phosphate analyzer 5 operates to detect and obtain phosphate ion content data.

[0032] As required, the boiler feedwater in the first sampling pipeline 6 and the second sampling pipeline 7 is a continuous flow of water to achieve real-time monitoring of the boiler feedwater quality. The boiler feedwater samples after being tested by the pH value detection device 2 and the phosphate analyzer 5 are discharged through the first sewage pipeline 12 and the second sewage pipeline 13 respectively and then collected centrally.

[0033] As needed, the phosphate analyzer 5 is mainly based on spectrophotometry. It detects the absorbance of the colored substance generated by the reaction of phosphate ions with molybdate (such as ammonium molybdate) in the sample solution under acidic conditions. According to Lambert-Beer's law (absorbance is proportional to solution concentration and optical path length), the concentration of phosphate is calculated through a standard curve or formula.

[0034] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figures 1 to 2 As shown, the pH value detection device 2 includes a second sample cup 25 and a pH meter 26. The pH meter 26 is fixed by a first bracket 27 and inserted into the second sample cup 25.

[0035] The pH meter 26 operates by measuring the potential difference between the measuring electrode and the reference electrode in the boiler feedwater in the second sample cup 25, and calculating the pH value using the linear relationship between hydrogen ion concentration and potential difference. The core components include a hydrogen ion-sensitive glass electrode and a reference electrode that provides a stable potential, following the Nernst Equation to achieve accurate pH measurement of the boiler feedwater.

[0036] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 1 As shown, a first metering column, a second metering column, a third metering column, and a fourth metering column are fixedly installed on the inlet pipelines of the first peristaltic pump 14, the second peristaltic pump 15, the third peristaltic pump 16, and the fourth peristaltic pump 17, respectively.

[0037] As needed, the first, second, third, and fourth metering columns are respectively equipped with a first peristaltic pump 14, a second peristaltic pump 15, a third peristaltic pump 16, and a fourth peristaltic pump 17. During phosphate ion detection, the first peristaltic pump 14 generates negative pressure by squeezing the tubing to extract the boiler feedwater sample from the first sample cup 1. Then, positive pressure is generated by squeezing the tubing to push the boiler feedwater sample into the first metering column. By controlling the rotation speed and running time of the first peristaltic pump 14, the repeated delivery and quantitative measurement of the boiler feedwater sample volume are achieved. The metering principles of the second, third, and fourth metering columns are the same as those of the first metering column.

[0038] Example 5: It differs from Examples 1 to 4 in that, as shown in the appendix... Figure 1 , 3 As shown, it also includes a conductivity detection device 18. The inlet of the conductivity detection device 18 is fixedly connected to a third sampling pipeline 19. The bottom outlet of the conductivity detection device 18 is fixedly connected to a third sewage pipeline 20 between the second sewage pipeline 13 and the third sewage pipeline 20. The conductivity detection device 18 includes a third sample cup 29 and a conductivity analyzer 30. The conductivity analyzer 30 is fixed by a second bracket 31 and inserted into the third sample cup 29.

[0039] As needed, boiler water flows continuously into conductivity testing equipment 18 via the third sampling pipeline 19.

[0040] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 , 4 As shown, it also includes a sodium ion detection device 21. The top inlet of the sodium ion detection device 21 is fixedly connected to a steam condensate pipeline 22. A de-cooling and pressure reducing device 23 is fixedly installed on the steam condensate pipeline 22. The bottom outlet of the sodium ion detection device 21 is fixedly connected to a second sewage pipeline 13 between the first sewage pipeline 12 and the third sewage pipeline 20. A fourth sewage pipeline 24 is fixedly connected to the second sewage pipeline 13 between the bottom outlet of the sodium ion detection device 21 and the first sewage pipeline 12 and the third sewage pipeline 20. The sodium ion detection device 21 includes a fourth sample cup 33 and a sodium meter 34. The sodium meter 34 is fixed by a third bracket 35 and inserted into the fourth sample cup 33.

[0041] The sodium ion content in steam is an important basis for judging the degree of boiler water pollution carried in the steam generated by the boiler (boiling or mechanically carried). Usually, the steam sample is cooled into steam condensate by desuperheater 23 and then sent to sodium meter 34 for detection.

[0042] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figures 1 to 4 As shown, the phosphate analyzer 5, pH meter 26, conductivity analyzer 30, and sodium meter 34 are respectively equipped with an analysis digital display screen, a first digital display screen 28, a second digital display screen 32, and a third digital display screen 36.

[0043] Example 8: It differs from Examples 1 to 7 in that: as shown in the appendix Figures 1 to 4 As shown, it also includes a PLC controller and an online monitoring camera. The first peristaltic pump 14, the second peristaltic pump 15, the third peristaltic pump 16, and the fourth peristaltic pump 17 are all electrically connected to the PLC controller. There is one or more online monitoring cameras, which are used to monitor and analyze the digital display screen, the first digital display screen 28, the second digital display screen 32, and the third digital display screen 36.

[0044] As required, calibration column 3 is a flow calibration column of model RX-500mL provided by Shanghai Longmeng Machinery (Rongxing Pump Industry) Co., Ltd., phosphate analyzer 5 is an HK-208 phosphate analyzer provided by Beijing Huakeyi Electric Instrument Research Institute, pH meter 26 is an HK-3C benchtop precision pH meter provided by Beijing Huakeyi Electric Instrument Research Institute, conductivity analyzer 30 is an HK-307 benchtop conductivity analyzer provided by Beijing Huakeyi Electric Instrument Research Institute, sodium meter 34 is an HK-51 benchtop sodium meter provided by Beijing Huakeyi Electric Instrument Research Institute, and the online monitoring camera is a DS-7804N provided by Ruizhi Electronic Technology Service Center of Karamay District.

[0045] In this invention, the first sample cup 1, pH value detection device 2, calibration column 3, reagent box 4, phosphate analyzer 2, first peristaltic pump 14, second peristaltic pump 15, third peristaltic pump 16, fourth peristaltic pump 17, conductivity detection device 18, and sodium ion detection device 21 are all installed indoors. The online monitoring camera is fixedly installed on the indoor wall, close to the area of ​​the phosphate analyzer 5, pH meter 26, conductivity analyzer 30, and sodium meter 34 that need to be monitored.

[0046] As needed, a phosphate ion detection program is set up. The PLC controller controls the running time of the first peristaltic pump 14, the second peristaltic pump 15, the third peristaltic pump 16, and the fourth peristaltic pump 17. The time interval is set by the time relay in the PLC controller to achieve accurate and cyclical operation of the phosphate ion detection program. The first peristaltic pump 14 extracts 50 mL of water sample from the first sample cup 1 into the calibration column 3. The second peristaltic pump 15 extracts 5 mL of 5% (mass concentration) vanadylmolybdic acid solution into the calibration column 3. After the water sample and reagent are mixed for 3 minutes, the third peristaltic pump 16 extracts 50 mL of the mixed sample into the phosphate analyzer 5 for detection. After 10 minutes, the fourth peristaltic pump 17 extracts 50 mL of desalinated water and sends it into the phosphate analyzer 5 for washing for 30 seconds. The phosphate ion detection program is then completed. The phosphate ion detection program is cycled again every 4 hours.

[0047] As needed, the monitoring information from the online monitoring camera can be transmitted in real time. After the phosphate analyzer 5, pH meter 26, conductivity analyzer 30, and sodium meter 34 test the sample, the test data are displayed on the analysis digital display screen, the first digital display screen 28, the second digital display screen 32, and the third digital display screen 36, respectively. The online monitoring camera monitors the analysis digital display screen, the first digital display screen 28, the second digital display screen 32, and the third digital display screen 36 in real time, which makes it convenient for analysts to centrally integrate the multiple parameters obtained from decentralized monitoring. At the same time, it enables effective traceability of the boiler water quality testing process and test results.

[0048] Depending on the needs, the pipelines and equipment of this boiler water quality monitoring device may also be equipped with conventional valves, thermometers, and pressure gauges known and commonly used in the field, according to production requirements. The PLC controller can be a Siemens S7-1500, which is equipped with a Yokogawa CS3000 DCS control system.

[0049] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0050] The usage process of this utility model embodiment is as follows: First, boiler feedwater enters the first sample cup 1 and pH value detection device 2 through the first sampling pipeline 6 and the second sampling pipeline 7, respectively. Boiler water enters the conductivity detection device 18 through the third sampling pipeline 19, and steam condensate enters the sodium ion detection device 21 through the steam condensate pipeline 22. The pH value detection device 2, conductivity detection device 18, and sodium ion detection device 21 operate, and the first digital display screen 28, the second digital display screen 32, and the third digital display screen 36 display the pH value, conductivity, and sodium ion concentration detection data, respectively. Next, the first peristaltic pump 14 delivers the required amount of boiler feedwater sample into the calibration column 3, mixes it with the vanadium molybdate solution, and then enters the phosphate analyzer 5 through the third peristaltic pump 16. Finally, the phosphate analyzer 5 operates, and the analysis digital display screen displays the phosphate detection data.

Claims

1. A boiler water quality monitoring device, characterized in that... The apparatus includes a first sample cup, a pH measuring device, a calibration column, a reagent tank, and a phosphate analyzer. A first sampling line is fixedly connected to the inlet of the first sample cup. A second sampling line is fixedly connected between the first sampling line and the inlet of the pH measuring device. A sample line is fixedly connected between the outlet of the first sample cup and the upper inlet of the calibration column. A reagent line is fixedly connected between the outlet of the reagent tank and the lower inlet of the calibration column. A mixed solution line is fixedly connected between the outlet of the calibration column and the upper inlet of the phosphate analyzer. A demineralized water line is fixedly connected to the top inlet of the phosphate analyzer. A first wastewater line is fixedly connected to the bottom outlet of the phosphate analyzer. A second wastewater line is fixedly connected between the outlet of the pH measuring device and the first wastewater line.

2. The boiler water quality monitoring device according to claim 1, characterized in that... The sample line, reagent line, mixed solution line, and demineralized water line are respectively equipped with a first peristaltic pump, a second peristaltic pump, a third peristaltic pump, and a fourth peristaltic pump.

3. The boiler water quality monitoring device according to claim 1 or 2, characterized in that... The pH testing device includes a second sample cup and a pH meter. The pH meter is fixed by a first bracket and inserted into the second sample cup.

4. The boiler water quality monitoring device according to claim 3, characterized in that... The inlet pipelines of the first, second, third, and fourth peristaltic pumps are respectively fixedly equipped with a first metering column, a second metering column, a third metering column, and a fourth metering column.

5. The boiler water quality monitoring device according to claim 1, 2, or 4, characterized in that... It also includes a conductivity testing device, the inlet of which is fixedly connected to a third sampling pipeline, and the bottom outlet of the conductivity testing device is fixedly connected to a third sewage pipeline. The conductivity testing device includes a third sample cup and a conductivity analyzer, and the conductivity analyzer is fixed by a second bracket and inserted into the third sample cup.

6. The boiler water quality monitoring device according to claim 3, characterized in that... It also includes a conductivity testing device. The inlet of the conductivity testing device is fixedly connected to a third sampling pipeline. The bottom outlet of the conductivity testing device is fixedly connected to a third sewage pipeline. The conductivity testing device includes a third sample cup and a conductivity analyzer. The conductivity analyzer is fixed by a second bracket and inserted into the third sample cup.

7. The boiler water quality monitoring device according to claim 5, characterized in that... It also includes a sodium ion detection device. The top inlet of the sodium ion detection device is fixedly connected to a steam condensate pipeline, and a desuperheater and pressure reducer are fixedly installed on the steam condensate pipeline. The bottom outlet of the sodium ion detection device is fixedly connected to a fourth sewage pipeline between the first sewage pipeline and the third sewage pipeline. The sodium ion detection device includes a fourth sample cup and a sodium meter. The sodium meter is fixed by a third bracket and inserted into the fourth sample cup.

8. The boiler water quality monitoring device according to claim 6, characterized in that... It also includes a sodium ion detection device. The top inlet of the sodium ion detection device is fixedly connected to a steam condensate pipeline, and a desuperheater and pressure reducer are fixedly installed on the steam condensate pipeline. The bottom outlet of the sodium ion detection device is fixedly connected to a fourth sewage pipeline between the first sewage pipeline and the third sewage pipeline. The sodium ion detection device includes a fourth sample cup and a sodium meter. The sodium meter is fixed by a third bracket and inserted into the fourth sample cup.

9. The boiler water quality monitoring device according to claim 7 or 8, characterized in that... The phosphate analyzer, pH meter, conductivity analyzer, and sodium meter are equipped with analytical digital display screens, a first digital display screen, a second digital display screen, and a third digital display screen, respectively.

10. The boiler water quality monitoring device according to claim 9, characterized in that... It also includes a PLC controller and an online monitoring camera. The first, second, third, and fourth peristaltic pumps are all electrically connected to the PLC controller. There is one or more online monitoring cameras, which are used to monitor the digital display screen, the first digital display screen, the second digital display screen, and the third digital display screen of the phosphate analyzer.

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