CN116046873A - Online monitoring system and method for chloride ions of desulfurization slurry - Google Patents
Online monitoring system and method for chloride ions of desulfurization slurry Download PDFInfo
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- CN116046873A CN116046873A CN202310067022.9A CN202310067022A CN116046873A CN 116046873 A CN116046873 A CN 116046873A CN 202310067022 A CN202310067022 A CN 202310067022A CN 116046873 A CN116046873 A CN 116046873A
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Abstract
The invention discloses a desulfurization slurry chloride ion on-line monitoring system and method, comprising a slurry inlet pipeline, a slurry inlet flow regulating valve, slurry pretreatment equipment, a measurement flow cell, a chloride ion electrode, a transmitter and a controller; the system and the method can realize on-line monitoring of the content of chloride ions in the desulfurization slurry, and the measurement accuracy is higher.
Description
Technical Field
The invention belongs to the field of power generation technology water quality monitoring, and relates to a system and a method for on-line monitoring of chloride ions in desulfurization slurry.
Background
In a wet desulfurization system of a power plant, the content of chloride ions in desulfurization slurry is one of main monitoring and control indexes in the operation of the desulfurization system, and the problems of corrosion of equipment of the desulfurization system, low desulfurization efficiency, poor gypsum quality and the like caused by the fact that the content of chloride ions in the desulfurization slurry is too high in a limestone-gypsum wet flue gas desulfurization process. In order to maintain the normal operation of the system, the chloride ion content in the slurry needs to meet certain requirements, and the chloride ion concentration of the slurry is generally maintained at 20000mg/L. When the measured value is low, the problem that chloride ions exceed the standard cannot be found, and corrosion of desulfurization equipment and related equipment is caused; when the measured value is higher, the actual control value is lower, the adding amount of limestone slurry is greatly increased, the operation cost of desulfurization equipment is increased, the discharge amount of desulfurization wastewater is increased, and the operation burden and the cost of zero-discharge equipment are increased. Therefore, the accurate monitoring of the content of the chloride ions is of great significance for safe and economic operation of the desulfurization system.
At present, the following problems exist in measuring the chloride ion content in desulfurization slurry:
1) The chloridion in the desulfurization slurry is mainly measured by a manual analysis method by periodically sampling every day by an inspector. The manual analysis method is complex in operation, greatly increases the workload of the staff, and the measurement accuracy is limited by the analysis level of the staff and is difficult to ensure.
2) Because the desulfurization slurry has complex components and contains a large amount of suspended matters and sludge, the measurement accuracy and the service life of the instrument are greatly influenced.
3) The desulfurization slurry has complex components and F contained therein - 、S 2- 、Br - And the like can cause interference on the measurement of chloride ions, and influence the accuracy of the measurement of the chloride ions.
Therefore, no instrument suitable for on-line monitoring of chloride ions in desulfurization slurry exists at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a system and a method for on-line monitoring of chloride ions in desulfurization slurry.
In order to achieve the purpose, the online monitoring system for the chloridion of the desulfurization slurry comprises a slurry inlet pipeline, a slurry inlet flow regulating valve, slurry pretreatment equipment, a measuring flow cell, chloridion electrodes, a transmitter and a controller;
the slurry inlet pipeline is communicated with an inlet on the side surface of the bottom of the slurry pretreatment equipment through a slurry inlet flow regulating valve, a water outlet on the side surface of the slurry pretreatment equipment is communicated with an inlet of the measurement flow cell, a chloride ion electrode is inserted into the measurement flow cell, a stirrer is arranged in the measurement flow cell, and the chloride ion electrode is connected with a transmitter and a controller.
The slurry pretreatment device comprises a slurry pretreatment device, a slurry pretreatment device and a slurry pretreatment device, wherein the slurry pretreatment device comprises a slurry pretreatment device, a slurry pretreatment device and a slurry pretreatment device, and further comprises a measurement flow cell inlet diverter valve and a measurement flow cell inlet valve, wherein an outlet of the slurry pretreatment device is communicated with an inlet of the measurement flow cell inlet diverter valve and an inlet of the measurement flow cell inlet valve, and an outlet of the measurement flow cell inlet valve is communicated with an inlet of the measurement flow cell.
The system also comprises a chloride ion standard solution box and a chloride ion standard solution metering pump, wherein the outlet of the chloride ion standard solution box is communicated with the measuring flow cell through the chloride ion standard solution metering pump.
Still include high-purity water tank and high-purity water metering pump, the export of high-purity water tank is linked together with the measurement flow cell through high-purity water metering pump, and the export of flush tank is linked together with the measurement flow cell through the flush pump.
And a water outlet at the top of the slurry pretreatment equipment is communicated with a measurement flow cell through a supernatant metering pump.
The inside filter screen that is equipped with of thick liquid pretreatment equipment, thick liquid pretreatment equipment bottom drain department is provided with the bottom blowoff valve, and the delivery port of thick liquid pretreatment equipment side and the delivery port at top are located the upside of filter screen, the entry of thick liquid pretreatment equipment is located the downside of filter screen.
The bottom drain outlet of the measuring flow cell is communicated with a bottom drain valve of the measuring flow cell.
The water outlet on the side surface of the measuring flow cell is communicated with a flow cell water outlet valve.
The system and the method for on-line monitoring of the chloride ions of the desulfurization slurry comprise the following steps:
the desulfurization slurry enters slurry pretreatment equipment through a slurry inlet flow regulating valve to carry out solid-liquid separation, the separated clear liquid enters a measurement flow cell, the chloride ion content in the flow cell is measured and measured through a chloride ion electrode, and a chloride ion measured value is displayed through a transmitter and a controller, so that the on-line measurement of the desulfurization slurry is realized.
The system and the method for on-line monitoring of the chloride ions of the desulfurization slurry comprise the following steps:
1) The clear liquid obtained after the slurry is subjected to solid-liquid separation by the slurry pretreatment equipment enters a measuring flow cell, the chloride ion content of the solution in the flow cell is measured and measured through a chloride ion electrode to serve as a calibration point 1, and the potential value of the standard point 1 is recorded as E1 after the data is stable, and the chloride ion concentration is C1;
2) Washing a measurement flow cell, after washing, sending 10mL of clear liquid after solid-liquid separation into the measurement flow cell, then injecting pure water into the measurement flow cell to dilute the clear liquid to 100mL, measuring the diluted solution through a chloride ion electrode as a calibration point 2, and recording the potential value of the calibration point as E2 and the chloride ion concentration as C2 after the data are stable;
3) Adding 10mL of a chloride ion standard solution with the concentration of 100g/L into a measurement flow cell, measuring the solution through a chloride ion electrode to serve as a calibration point 3, and recording the potential value of the standard solution as E3 after the data are stable, wherein the chloride ion concentration is C3;
calculating the calibrated electrode potential E, calculating the content of chloride ions after calibration according to the calibrated electrode potential E, wherein,
E1-E2＝-k·lg(C1/C2)＝-k
E2-E3＝-k·lg(C2/C3)
C3＝(100C2+10×100000)/110
E2＝E0’-k·lg(C2/35000)
E＝E0’-k·lg(C Cl /35000)。
the invention has the following beneficial effects:
according to the system and the method for on-line monitoring of chloride ions in the desulfurization slurry, in a normal measurement state, the desulfurization slurry firstly enters the slurry pretreatment equipment to carry out solid-liquid separation on the slurry, clear liquid enters the measurement flow cell and is measured through the chloride ion electrode, so that on-line monitoring of the content of chloride ions in the desulfurization slurry is realized; when calibration is needed, the clear liquid is diluted and concentrated, and the measured value of the original clear liquid is calibrated according to the diluted and concentrated measured value of the solution, so that the automatic calibration of the desulfurization slurry chloride ion on-line monitoring system is realized, and the measurement accuracy is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a flowchart of a third embodiment.
The device comprises a slurry inlet flow regulating valve 1, slurry pretreatment equipment 2, a supernatant metering pump 3, a filter screen 4, a bottom drain valve of pretreatment equipment 5, a measuring flow cell inlet flow dividing valve 6, a measuring flow cell inlet valve 7, a measuring flow cell 8, a chloride ion electrode 9, a stirrer 10, a measuring flow cell bottom drain valve 11, a flow cell water outlet valve 12, a chloride ion standard solution metering pump 13, a high-purity water metering pump 14, a flushing water pump 15, a chloride ion standard solution tank 16, a high-purity water tank 17, a flushing water tank 18, a transmitter 19 and a controller, wherein the slurry inlet flow regulating valve is a slurry inlet;
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Example 1
Referring to fig. 1, the online monitoring system for the chloride ions of the desulfurization slurry according to the present invention comprises a slurry inlet pipeline, a slurry inlet flow regulating valve 1, a slurry pretreatment device 2, a supernatant metering pump 3, a filter screen 4, a bottom drain valve 5 of the pretreatment device, a measurement flow cell inlet diverter valve 6, a measurement flow cell inlet valve 7, a measurement flow cell 8, a chloride ion electrode 9, a stirrer 10, a measurement flow cell bottom drain valve 11, a flow cell outlet valve 12, a chloride ion standard solution metering pump 13, a high purity water metering pump 14, a flushing water pump 15, a chloride ion standard solution tank 16, a high purity water tank 17, a flushing water tank 18, a transmitter and a controller 19;
the slurry inlet pipeline is communicated with an inlet on the side surface of the bottom of the slurry pretreatment equipment 2 through a slurry inlet flow regulating valve 1, a water outlet on the side surface of the slurry pretreatment equipment 2 is communicated with an inlet of a measuring flow cell inlet flow dividing valve 6 and an inlet of a measuring flow cell inlet valve 7, and an outlet of the measuring flow cell inlet valve 7 is communicated with an inlet of a measuring flow cell 8;
the chloride ion electrode 9 is connected with a transmitter and a controller 19, and the transmitter and the controller 19 are connected with the control ends of the supernatant metering pump 3, the measuring flow cell inlet diverter valve 6, the measuring flow cell inlet valve 7, the stirrer 10, the measuring flow cell bottom blow-down valve 11, the flow cell water outlet valve 12, the chloride ion standard solution metering pump 13, the high-purity water metering pump 14 and the flushing water pump 15;
the outlet of the chloride ion standard solution box 16 is communicated with the measuring flow cell 8 through a chloride ion standard solution metering pump 13;
the outlet of the high-purity water tank 17 is communicated with the measuring flow cell 8 through the high-purity water metering pump 14, and the outlet of the flushing water tank 18 is communicated with the measuring flow cell 8 through the flushing water pump 15;
the water outlet at the top of the slurry pretreatment equipment 2 is communicated with a measurement flow cell 8 through a supernatant metering pump 3;
a filter screen 4 is arranged in the slurry pretreatment equipment 2 for carrying out solid-liquid separation on the desulfurization slurry, a bottom drain valve is arranged at a bottom drain outlet of the slurry pretreatment equipment 2, and the concentrated slurry is discharged through the bottom drain valve 5 of the pretreatment equipment, wherein a water outlet on the side surface and a water outlet on the top of the slurry pretreatment equipment 2 are positioned on the upper side of the filter screen 4, and an inlet of the slurry pretreatment equipment 2 is positioned on the lower side of the filter screen 4;
the slurry inlet flow regulating valve 1, the measuring flow cell inlet flow dividing valve 6, the measuring flow cell inlet valve 7, the measuring flow cell bottom blow-down valve 11 and the flow cell water outlet valve 12 are all electromagnetic valves;
the supernatant metering pump 3, the chloride ion standard solution metering pump 13, the high-purity water metering pump 14, the flushing water pump 15 and the stirrer 10 are all driven by stepping motors;
the transmitter and controller 19 integrates system control and numerical display, and the instrument has an automatic temperature compensation function;
the chloride ion electrode 9 is inserted into the measuring flow cell 8, a stirrer 10 is arranged in the measuring flow cell 8, a bottom drain outlet of the measuring flow cell 8 is communicated with a measuring flow cell bottom drain valve 11, and a water outlet on the side surface of the measuring flow cell 8 is communicated with a flow cell water outlet valve 12.
Example two
The invention relates to an online monitoring system and an online monitoring method for chloride ions of desulfurization slurry, comprising the following steps:
the slurry inlet flow regulating valve 1, the measuring flow cell inlet valve 7 and the flow cell outlet valve 12 are opened, the blow-down valve 11 at the bottom of the measuring flow cell is closed, the desulfurization slurry enters the slurry pretreatment equipment 2 through the slurry inlet flow regulating valve 1 for solid-liquid separation, clear liquid enters the measuring flow cell 8 through the measuring flow cell inlet valve 7, the chloride ion content in the measuring flow cell 8 is measured through the chloride ion electrode 9, the chloride ion measured value is displayed through the transmitter and the controller 19, and the measured slurry is discharged through the flow cell outlet valve 12, so that the on-line measurement of the desulfurization slurry is realized.
Example III
Referring to fig. 2, the system and method for on-line monitoring of chloride ions in desulfurization slurry according to the present invention comprises the steps of:
1) Opening a slurry inlet flow regulating valve 1, a measuring flow cell inlet valve 7 and a flow cell outlet valve 12, closing a drain valve 11 at the bottom of the measuring flow cell, enabling clear liquid after solid-liquid separation of slurry through a slurry pretreatment device 2 to enter a measuring flow cell 8 through the measuring flow cell inlet valve 7, measuring the chloride ion content in the measuring flow cell 8 through a chloride ion electrode 9 to serve as a calibration point 1, and recording a potential value E1 and a chloride ion concentration C1 after data are stable;
2) Opening a slurry inlet flow regulating valve 1 and a measuring flow cell inlet flow dividing valve 6, closing a measuring flow cell inlet valve 7 and a flow cell outlet valve 12, opening a measuring flow cell bottom blow-down valve 11, and opening a flushing water pump 15 to flush a measuring flow cell 8; after the cleaning is finished, closing a drain valve 11 at the bottom of the measuring flow cell, opening a supernatant metering pump 3, pumping 10mL of clear liquid into the measuring flow cell 8 through the supernatant metering pump 3, starting a high-purity water metering pump 14, simultaneously opening a stirrer 10, diluting the clear liquid in the measuring flow cell 8 to 100mL, measuring the diluted solution as a calibration point 2, and recording the potential value of E2 and the chloride ion concentration of C2 after the data are stable;
3) Starting a chloridion standard solution metering pump 13, adding 10mL of chloridion standard solution with the concentration of 100g/L into a measuring flow cell 8, measuring the solution through a chloridion electrode 9 to serve as a calibration point 3, recording the potential value of the standard solution E3 after the data is stable, and finishing automatic calibration when the chloridion concentration is C3;
4) After the automatic calibration is finished, the blow-down valve 11 at the bottom of the measuring flow cell is opened, the flushing water pump 15 is started, the measuring flow cell 8 is cleaned, and after the cleaning is finished, the measuring mode is automatically entered.
5) The calculation formula is as follows:
E1-E2＝-k·lg(C1/C2)＝-k
E2-E3＝-k·lg(C2/C3)
C3＝(100C2+10×100000)/110
E2＝E0’-k·lg(C2/35000)
the values of k and E0' are obtained and according to the formula: e=e0' -k·lg (C Cl /35000), the chloride ion content after calibration is calculated from the electrode potential value E after calibration.
Table 1 shows the chlorine ion content of different desulphurized slurries measured according to the calibration and measurement methods of the present invention, compared with the manual titration measurements.
TABLE 1
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The system and the method for on-line monitoring of the chloride ions of the desulfurization slurry are characterized by comprising a slurry inlet pipeline, a slurry inlet flow regulating valve (1), slurry pretreatment equipment (2), a measurement flow cell (8), a chloride ion electrode (9), a transmitter and a controller (19);
the slurry inlet pipeline is communicated with an inlet on the side surface of the bottom of the slurry pretreatment equipment (2) through a slurry inlet flow regulating valve (1), a water outlet on the side surface of the slurry pretreatment equipment (2) is communicated with an inlet of a measurement flow cell (8), a chloride ion electrode (9) is inserted into the measurement flow cell (8), a stirrer (10) is arranged in the measurement flow cell (8), and the chloride ion electrode (9) is connected with a transmitter and a controller (19).
2. The on-line monitoring system and method for desulfurization slurry chloride ions according to claim 1, further comprising a measuring flow cell inlet diverter valve (6) and a measuring flow cell inlet valve (7), wherein the outlet of the slurry pretreatment device (2) is communicated with the inlets of the measuring flow cell inlet diverter valve (6) and the measuring flow cell inlet valve (7), and the outlet of the measuring flow cell inlet valve (7) is communicated with the inlet of the measuring flow cell (8).
3. The on-line monitoring system and method for chloride ions in desulfurization slurry according to claim 1, further comprising a chloride ion standard solution tank (16) and a chloride ion standard solution metering pump (13), wherein an outlet of the chloride ion standard solution tank (16) is communicated with the measuring flow cell (8) through the chloride ion standard solution metering pump (13).
4. The online monitoring system and method for the chloride ions of the desulfurization slurry according to claim 1, further comprising a high-purity water tank (17) and a high-purity water metering pump (14), wherein an outlet of the high-purity water tank (17) is communicated with the measurement flow cell (8) through the high-purity water metering pump (14), and an outlet of the flushing water tank (18) is communicated with the measurement flow cell (8) through a flushing water pump (15).
5. The on-line monitoring system and method for chloride ions in desulfurization slurry according to claim 1, wherein a water outlet at the top of the slurry pretreatment equipment (2) is communicated with a measuring flow cell (8) through a supernatant metering pump (3).
6. The online monitoring system and method for desulfurization slurry chloride ions according to claim 5, wherein a filter screen (4) is arranged in the slurry pretreatment equipment (2), a bottom drain valve is arranged at a bottom drain outlet of the slurry pretreatment equipment (2), a water outlet on the side surface and a water outlet on the top of the slurry pretreatment equipment (2) are positioned on the upper side of the filter screen (4), and an inlet of the slurry pretreatment equipment (2) is positioned on the lower side of the filter screen (4).
7. The on-line monitoring system and method for chloride ions in desulfurization slurry according to claim 1, wherein a bottom drain outlet of the measurement flow cell (8) is communicated with a bottom drain valve (11) of the measurement flow cell.
8. The on-line monitoring system and method for chloride ions in desulfurization slurry according to claim 1, wherein a water outlet on the side surface of the measuring flow cell (8) is communicated with a flow cell water outlet valve (12).
9. The online monitoring system and method for the chloride ions of the desulfurization slurry are characterized by comprising the following steps:
the desulfurization slurry enters slurry pretreatment equipment (2) through a slurry inlet flow regulating valve (1) for solid-liquid separation, the separated clear liquid enters a measurement flow cell (8), the chloride ion content in the measurement flow cell (8) is measured through a chloride ion electrode (9), and the chloride ion measurement value is displayed through a transmitter and a controller (19), so that the on-line measurement of the desulfurization slurry is realized.
10. The online monitoring system and method for the chloride ions of the desulfurization slurry are characterized by comprising the following steps:
1) The clear liquid obtained after the solid-liquid separation of the slurry through the slurry pretreatment equipment (2) enters a measuring flow cell (8), the chloride ion content of the solution in the measuring flow cell (8) is measured through a chloride ion electrode (9) to be used as a calibration point 1, and the potential value of the standard point is recorded as E1 after the data is stable, and the chloride ion concentration is C1;
2) Washing a measurement flow cell (8), after washing, conveying 10mL of clear liquid after solid-liquid separation into the measurement flow cell (8), then injecting pure water into the measurement flow cell (8) to dilute the clear liquid to 100mL, measuring the diluted solution through a chloride ion electrode (9) as a calibration point 2, and recording the potential value of the diluted solution as E2 and the chloride ion concentration as C2 after the data are stable;
3) Adding 10mL of a chloride ion standard solution with the concentration of 100g/L into a measurement flow cell (8), measuring the solution through a chloride ion electrode (9) to serve as a calibration point 3, and recording the potential value of the standard solution as E3 and the chloride ion concentration as C3 after the data are stable;
calculating the calibrated electrode potential E, calculating the content of chloride ions after calibration according to the calibrated electrode potential E, wherein,
E1-E2＝-k·lg(C1/C2)＝-k
E2-E3＝-k·lg(C2/C3)
C3＝(100C2+10×100000)/110
E2＝E0’-k·lg(C2/35000)
E＝E0’-k·lg(C Cl /35000)。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116559250A (en) * | 2023-05-12 | 2023-08-08 | 华电电力科学研究院有限公司 | Online detection device and method for chloride ions of desulfurization slurry of thermal power plant |
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| CN116559250A (en) * | 2023-05-12 | 2023-08-08 | 华电电力科学研究院有限公司 | Online detection device and method for chloride ions of desulfurization slurry of thermal power plant |
| CN116559250B (en) * | 2023-05-12 | 2024-02-27 | 华电电力科学研究院有限公司 | Online detection device and method for chloride ions of desulfurization slurry of thermal power plant |
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