CN212622384U - On-line dissolved oxygen meter zero calibration system - Google Patents
On-line dissolved oxygen meter zero calibration system Download PDFInfo
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- CN212622384U CN212622384U CN202022165250.4U CN202022165250U CN212622384U CN 212622384 U CN212622384 U CN 212622384U CN 202022165250 U CN202022165250 U CN 202022165250U CN 212622384 U CN212622384 U CN 212622384U
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 239000001301 oxygen Substances 0.000 title claims abstract description 104
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 104
- 239000012086 standard solution Substances 0.000 claims abstract description 93
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 16
- 230000010287 polarization Effects 0.000 abstract description 12
- 239000003792 electrolyte Substances 0.000 abstract description 10
- 238000009825 accumulation Methods 0.000 abstract description 3
- 210000004027 cell Anatomy 0.000 description 36
- 230000000694 effects Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 210000003040 circulating cell Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The utility model provides an online dissolved oxygen meter zero calibration system, which comprises a flow cell and a standard solution cell; a dissolved oxygen sensor is arranged in the flow cell, the flow cell is connected with a water sample valve through a water sample pipe, and a sample discharge valve is arranged on the flow cell; the outlet of the standard solution pool is connected with one end of a standard solution pipeline, the other end of the standard solution pipeline is provided with an exhaust valve, the standard solution pipeline is communicated with a water sample pipe through a communicating pipe, and a standard solution valve is arranged on the communicating pipe; when the method is used for calibrating the zero point of the online dissolved oxygen meter, the dissolved oxygen sensor is prevented from contacting with air, and the polarization time of the sensor in a zero point standard solution is shortened. The flow cell has no air accumulation, the polarization time of the sensor is shortened, the sensor is in a sealed state during polarization, the zero standard solution is always kept in an oxygen-free state, and the background oxygen concentration of electrolyte in the sensor reaches the lowest point during zero calibration. The accuracy of the online dissolved oxygen meter is improved, and the zero calibration time is shortened.
Description
Technical Field
The utility model relates to a power plant steam circulation system online chemical instrumentation measures and calibrates the field, in particular to online dissolved oxygen meter calibration system at zero point.
Background
Accurate control of dissolved oxygen is an important means to prevent corrosion, scaling and salt accumulation in power plant thermal equipment. For a unit for the complete volatilization treatment of the feed water, the dissolved oxygen of the feed water is generally controlled to be less than 10 mug/L, otherwise, the corrosion of metal can be caused; for the unit for adding oxygen to the water, the dissolved oxygen must be controlled within a certain range to achieve the expected anticorrosion effect. To achieve this, the concentration of dissolved oxygen in the water vapor system must be accurately measured. Therefore, the accurate measurement of the dissolved oxygen in the water vapor system has important significance for the safe operation of the unit.
At present, the monitoring of the dissolved oxygen of the power plant mainly depends on an online dissolved oxygen meter, and the working error of the dissolved oxygen meter must meet the regulation in the electric power industry standard DL/T677-. The necessary condition that the working error is within the specified range is the accuracy of the zero point of the dissolved oxygen meter.
When the zero point of the dissolved oxygen meter is calibrated, the traditional calibration method easily causes the zero point to be higher, reduces the accuracy of the zero point of the meter, and causes the measured value to be lower and even causes the phenomenon that the measured value is zero. This is mainly due to the following reasons: when an online dissolved oxygen meter is used for measuring a low dissolved oxygen water sample, the background oxygen content of electrolyte in a dissolved oxygen sensor is extremely low, the traditional calibration method is that the dissolved oxygen sensor is taken out from a flow cell, a large number of oxygen molecules rapidly enter a sensor chamber through a breathable film, the background oxygen concentration of the electrolyte is increased to be more than 5000 [ mu ] g/L, and after the dissolved oxygen sensor is placed in a zero standard solution, the polarization time for consuming the background oxygen of the electrolyte is very long, so that the zero calibration time is prolonged, generally more than 24 hours, and the zero calibration of the meter is seriously influenced. In the traditional calibration method, the sealing property between a calibration container and a dissolved oxygen sensor is poor; when the dissolved oxygen sensor is mounted to the calibration container, it is difficult to exhaust air, causing air to accumulate in the calibration container. Because the sensor consumes the polarization time of the background oxygen of the electrolyte, the sealing performance between the calibration container and the dissolved oxygen sensor is poor and the air in the flow cell is gathered, when the dissolved oxygen sensor is polarized in the zero standard solution, the anaerobic state of the zero standard solution is difficult to ensure, and the zero calibration causes the zero to be higher; because the polarization time of the sensor consuming the background oxygen is long, the sealing performance between the calibration container and the dissolved oxygen sensor is poor and air in the circulating cell is gathered, the background oxygen concentration of electrolyte in the sensor is difficult to reach the lowest point when the zero point is calibrated, and the zero point is higher when the zero point calibration is carried out. Therefore, the traditional method for calibrating the zero point of the online dissolved oxygen meter has long calibration time and poor accuracy.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a calibration system and method at zero point of online dissolved oxygen meter avoids dissolved oxygen sensor and air contact, avoids the air gathering in the flow cell, and dissolved oxygen sensor seals in the flow cell, shortens the polarization time of consuming electrolyte background oxygen in the standard solution at zero point of sensor, realizes the quick and accurate calibration at zero point of online dissolved meter.
The utility model discloses a realize through following technical scheme:
an online dissolved oxygen meter zero calibration system comprises a flow cell and a standard solution cell;
a dissolved oxygen sensor is arranged in the flow cell, the flow cell is connected with a water sample valve through a water sample pipe, and a sample discharge valve is arranged on the flow cell;
the outlet of the standard solution pool is connected with one end of a standard solution pipeline, the other end of the standard solution pipeline is provided with an exhaust valve, the standard solution pipeline is communicated with a water sample pipe through a communicating pipe, and a standard solution valve is arranged on the communicating pipe;
when the dissolved oxygen meter is calibrated, the exhaust valve is used for exhausting gas in the communicating pipe and the standard solution pipeline, and standard solution in the standard solution pool is injected into the flow cell through the communicating pipe.
Preferably, the dissolved oxygen sensor is hermetically disposed in the flow cell.
Preferably, the standard liquid pipeline is provided with a one-way valve and is positioned on the standard liquid pipeline between the communicating pipe and the standard solution tank.
Preferably, the height of the standard solution pool is greater than the height of the flow-through pool.
Preferably, the height drop between the standard solution tank and the flow-through tank is at least 0.2 m.
Preferably, the volume of the standard solution pool is 5-10 times larger than the sum of the volumes of the flow-through pool, the water sample pipe and the communicating pipe.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a pair of online dissolved oxygen meter calibration system at zero point, because the dissolved oxygen meter is in online operating condition, consequently the dissolved oxygen sensor seals always and soaks in the water sample, and the difficult point of dissolved oxygen meter calibration lies in, and the sealed switching of water sample and zero point standard solution stops oxygen and enters into the circulation pond in. The utility model discloses a calibration system is when the calibration, utilize the zero standard solution in online water sample and the standard solution pond with communicating pipe and the gas in the mark liquid pipeline from discharge valve discharge, be in anaerobic environment in guaranteeing whole calibration system's the pipeline, then pass through mark liquid pipe with communicating pipe with the standard solution of zero point again and annotate to the circulation pond in, water sample in the circulation pond is replaced with this, realize water sample and the replacement of zero standard solution under anaerobic environment in the circulation pond, avoid dissolved oxygen sensor and air contact, just also avoid the oxygen in the air to pass through during the ventilated membrane gets into the sensor room, avoid the gathering of air in the circulation pond simultaneously, shorten sensor polarization time, make calibration time shorten to within an hour, can ensure when calibration zero that the background oxygen concentration in the sensor electrolyte reachs the minimum, improve the accuracy of zero point calibration.
Drawings
Fig. 1 is a schematic structural diagram of the calibration system of the present invention.
In the figure: the system comprises a dissolved oxygen transmitter 1, a dissolved oxygen sensor 2, a flow cell 3, a sample discharge valve 4, a water sample valve 5, a standard solution valve 6, a standard solution valve 7, a standard solution cell 8, a one-way valve 9 and an exhaust valve.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are provided for purposes of illustration and not limitation.
Referring to fig. 1, the system for calibrating the zero point of the online dissolved oxygen meter comprises a flow cell 3 filled with a water sample, a sample discharge valve 4, a water sample valve 5, a standard solution cell 7, an exhaust valve 9 and a standard solution valve 6.
Above-mentioned sealed dissolved oxygen sensor 2 that has in the circulation pond 3, circulation pond 3 is connected with water sample valve 5 through water sample pipe, and stock layout valve 4 sets up on the upper portion of circulation pond 3, and standard solution pond 7 is connected with the mark liquid pipeline, and mark liquid pipeline and water sample pipe are connected through communicating pipe, and mark liquid valve 6 sets up on communicating pipe, and discharge valve 9 sets up the end at mark liquid pipeline.
When the dissolved oxygen meter is calibrated, the exhaust valve 9 is used for exhausting air in the communicating pipe and the standard solution pipeline, and the standard solution in the standard solution tank 7 is injected into the flow cell 3 through the standard solution pipe and the communicating pipe.
This online dissolved oxygen meter calibration system at zero point, because the dissolved oxygen meter is in online operating condition, consequently the dissolved oxygen sensor seals always and soaks in the water sample, the difficult point of dissolved oxygen meter calibration just lies in, and the sealed switching of water sample and zero point standard solution in the flow cell 3 stops oxygen to enter into flow cell 3. The utility model discloses a calibration system is when the calibration, utilize the zero standard solution in online water sample and the standard solution pond 7 with communicating pipe and the gas in the mark liquid pipeline from discharge valve 9 discharge, be in anaerobic environment in guaranteeing whole calibration system's the pipeline, then pass through mark liquid pipe with communicating pipe with will zero standard solution again and annotate to flow cell 3 in, with this water sample in the replacement flow cell 3, realize the replacement of water sample and zero standard solution under anaerobic environment in flow cell 3, avoid dissolving oxygen sensor 2 and air contact, just also avoid oxygen in the air to pass through during the ventilated membrane gets into sensor 2 rooms, shorten 2 polarization time of sensor, realize the anaerobic calibration of dissolved oxygen meter, can ensure that the background oxygen concentration in the electrolyte of sensor 2 reachs the minimum when calibration zero, improve the accuracy of zero calibration.
The dissolved oxygen meter comprises a dissolved oxygen transducer 1 and a dissolved oxygen sensor 2, the flow cell 3 is a sealed cell, the dissolved oxygen sensor 2 is sealed in the flow cell 3, and the dissolved oxygen transducer 1 is positioned outside the flow cell 3. The existing calibration container and the dissolved oxygen sensor 2 have poor sealing performance, and when the dissolved oxygen sensor 2 is installed in the calibration container, air in the calibration container is difficult to exhaust, so that the air is gathered in the calibration container. In the calibration, oxygen in the air is dissolved into the zero standard solution, causing inaccurate calibration of the dissolved oxygen meter. The utility model discloses well adoption sealed flow cell 3 avoids the air to gather in flow cell 3, avoids the oxygen in the air to dissolve to standard solution at zero point, makes the calibration of dissolved oxygen meter be in complete anaerobic environment, improves the accuracy of calibration.
The three-way joints at the two ends of the communicating pipe are respectively communicated with the water sample pipe and the standard liquid pipeline, and the communicating pipe, the standard liquid pipeline and the exhaust valve 9 are respectively connected with one interface of the three-way joint; the other ends of the water sample valve 5, the water sample pipe and the communicating pipe are respectively connected with an interface of another tee joint.
Be provided with check valve 8 on the pipeline between standard solution pond 7 and the three-way valve, when the gas in the communicating pipe of discharging, adopt the gas in the water sample extrusion pipeline, adopt check valve 8 to seal standard solution pond 7 one-way, avoid the water sample to enter into standard solution pond 7, can utilize the standard solution in the standard solution pond 7 to discharge the air in the standard solution pipeline simultaneously, guarantee that whole calibration system's pipeline is in anaerobic state.
The standard solution tank 7 is funnel-shaped. The height of the standard solution pool 7 is larger than that of the flow-through pool 3, the zero standard solution in the standard solution pool 7 is replaced into the flow-through pool 3 by adopting the pressure difference, the zero standard solution is injected by adopting the pressure difference method, an external pressurizing tool is not needed, the structure is simple, and the operation is easy.
In order to enable the zero standard solution to quickly replace the water sample in the flow cell 3 and avoid reducing the concentration of the zero standard solution to the maximum extent, the height drop between the standard solution cell 7 and the flow cell 3 is 0.2m at the minimum.
Furthermore, the volume of the standard solution pool 7 is 5-10 times larger than the volume sum of the flow-through pool 3, the water sample pipe and the communicating pipe, so that the zero standard solution can be ensured to completely replace the water samples of the flow-through pool 3, the water sample pipe and the communicating pipe, and the concentration of the zero standard solution is ensured.
The following is a detailed description of the calibration method of the zero calibration system for the online dissolved oxygen meter provided by the present invention, and specifically includes the following steps:
step 1, closing a standard solution valve 6 and an exhaust valve 9, and filling a zero standard solution into a standard solution pool 7, wherein air accumulation exists in a pipeline between the standard solution valve 6, a one-way valve 8 and the exhaust valve 9.
And 2, closing the sample discharge valve 4, opening the water sample valve 5, the standard solution valve 6 and the exhaust valve 9, discharging the water sample from the exhaust valve 9 through the communicating pipe, and simultaneously discharging the zero standard solution from the exhaust valve 9 through the standard solution pipeline, so that air existing in the pipeline among the standard solution valve 6, the one-way valve 8 and the exhaust valve 9 is discharged from the exhaust valve 9.
When there is liquid flowing out of the gas outlet valve 9, or after a predetermined time of liquid flowing out, it can be determined that there is no gas in the line.
And 3, closing the water sample valve 5 and the exhaust valve 9, opening the sample discharge valve 4 and the standard solution valve 6, and allowing the zero standard solution to flow into the flow cell 3 under the action of pressure difference until the water sample in the flow cell 3 is completely replaced.
And 4, closing the sample discharge valve 4 and the standard solution valve 6, starting polarization of the dissolved oxygen sensor 2, and calibrating the zero point of the dissolved oxygen meter when the display value of the dissolved oxygen transmitter 1 is reduced to the minimum value.
Collect the liquid of stock layout valve 4 exhaust, when the volume of liquid is greater than 5 times of flow-through cell 3, water sample pipe and draught tube volume sum, when adopting the standard solution at zero point to replace because of the water sample in the flow-through cell 3, can not avoid producing and dissolve each other, but through control injection pressure and injection volume, can furthest avoid reducing the concentration of standard solution at zero point, simultaneously because standard solution at zero point is the supersaturation state, a small amount of dilution can be ignored, can not influence the calibration at zero point of dissolved oxygen meter.
Taking an economizer inlet dissolved oxygen meter of a 600MW supercritical DC furnace unit of a certain power plant as an example, the effects of different calibration methods are shown in Table 1.
TABLE 1 Effect of different calibration methods
| Calibration method | Calibrating time | Indicating value of instrument | Indication of standard instrument | Working error |
| General of | 24h | 0μg/L | 3.1μg/L | -3.1 |
| The utility model discloses | 1h | 3.2μg/L | 3.0μg/L | 0.2 |
Power industry Standard DL/T677 Specifications 2018 Online chemical instrumentation test procedure for Power plants: when the oxygen concentration of the water sample measured by the detected table is not more than 10 mu g/L, the working error is that delta is more than-1G< 1, obviously, after the conventional calibration method calibrated the zero point to the economizer import dissolved oxygen meter, made the instrument be in unqualified state, used the utility model discloses a method after the calibration, the instrument error was qualified.
According to the calibration method of the zero calibration system of the online dissolved oxygen meter, in the calibration process, the dissolved oxygen sensor 2 is sealed in the flow cell 3, the dissolved oxygen sensor 2 is not in contact with air, the polarization time of the dissolved oxygen sensor 2 for consuming the background oxygen in the zero standard solution is greatly shortened, meanwhile, no air is gathered in the flow cell 3, the zero standard solution is always kept in an oxygen-free state, the polarization time of the sensor 2 is further shortened, the background oxygen concentration of the electrolyte in the dissolved oxygen sensor 2 reaches the lowest point in the zero calibration process is also ensured, the accuracy of the zero calibration is improved, the working error of the meter is reduced, and the accuracy of the meter is improved; the time of zero point calibration is shortened, and accurate calibration of the online dissolved oxygen meter in a short time can be realized.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (6)
1. An online dissolved oxygen meter zero calibration system is characterized by comprising a flow cell (3) and a standard solution cell (7);
a dissolved oxygen sensor (2) is arranged in the flow cell (3), the flow cell (3) is connected with a water sample valve (5) through a water sample pipe, and a sample discharge valve (4) is arranged on the flow cell (3);
an outlet of the standard solution tank (7) is connected with one end of a standard solution pipeline, the other end of the standard solution pipeline is provided with an exhaust valve (9), the standard solution pipeline is communicated with a water sample pipe through a communicating pipe, and a standard solution valve (6) is arranged on the communicating pipe;
when the dissolved oxygen meter is calibrated, the exhaust valve (9) is used for exhausting gas in the communicating pipe and the standard solution pipeline, and standard solution in the standard solution pool (7) is injected into the flow cell (3) through the communicating pipe.
2. The system for zero calibration of an online dissolved oxygen meter according to claim 1, wherein the dissolved oxygen sensor (2) is hermetically disposed in the flow cell (3).
3. The system for calibrating the zero point of the online dissolved oxygen meter according to claim 1, wherein the standard liquid pipeline is provided with a check valve (8) and is positioned on the standard liquid pipeline between the communicating pipe and the standard solution tank (7).
4. The on-line dissolved oxygen meter zero calibration system according to claim 1, wherein the height of the standard solution tank (7) is greater than the height of the flow cell (3).
5. The on-line dissolved oxygen meter zero calibration system according to claim 4, wherein the height drop between the standard solution tank (7) and the flow-through tank (3) is at least 0.2 m.
6. The on-line dissolved oxygen meter zero calibration system according to claim 1, wherein the volume of the standard solution tank (7) is 5-10 times larger than the sum of the volumes of the flow-through tank (3), the water sample pipe and the communication pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022165250.4U CN212622384U (en) | 2020-09-27 | 2020-09-27 | On-line dissolved oxygen meter zero calibration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022165250.4U CN212622384U (en) | 2020-09-27 | 2020-09-27 | On-line dissolved oxygen meter zero calibration system |
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| CN212622384U true CN212622384U (en) | 2021-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067682A (en) * | 2020-09-27 | 2020-12-11 | 华能陕西秦岭发电有限公司 | An online dissolved oxygen meter zero point calibration system and method |
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- 2020-09-27 CN CN202022165250.4U patent/CN212622384U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067682A (en) * | 2020-09-27 | 2020-12-11 | 华能陕西秦岭发电有限公司 | An online dissolved oxygen meter zero point calibration system and method |
| CN112067682B (en) * | 2020-09-27 | 2025-03-11 | 大唐秦岭发电有限公司 | An online dissolved oxygen meter zero point calibration system and method |
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Address after: 714206 8th floor, block B, Xi'an Hongxiang building, No. 90, Xingqing Road, Beilin District, Xi'an City, Shaanxi Province Patentee after: Datang Qinling Power Generation Co.,Ltd. Address before: 714206 Luofu Industrial Park, Huayin City, Weinan City, Shaanxi Province Patentee before: HUANENG SHAANXI QINLING POWER GENERATION CO.,LTD. |