CN210894193U - Accuracy inspection system of online pH table of power plant steam system - Google Patents
Accuracy inspection system of online pH table of power plant steam system Download PDFInfo
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- CN210894193U CN210894193U CN201920860413.5U CN201920860413U CN210894193U CN 210894193 U CN210894193 U CN 210894193U CN 201920860413 U CN201920860413 U CN 201920860413U CN 210894193 U CN210894193 U CN 210894193U
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Abstract
An accuracy test system for an online pH meter of a steam system of a power plant comprises a standard conductivity meter connected with the online pH meter to be tested in parallel and a data acquisition and processing system connected with the output end of the standard conductivity meter; the detection method comprises the following steps: 1) connecting a standard conductivity meter nearby with a detected online pH meter in parallel, wherein a water sample is the water sample when the detected online pH meter normally measures, and a data acquisition and processing system acquires a conductivity measurement value of the standard conductivity meter; 2) the data acquisition and processing system converts the conductivity measurements of the standard conductivity meter to a pH; 3) the data acquisition and processing system calculates the error of the detected online pH meter according to the converted pH value and the indication value of the detected online pH meter, and if the error exceeds the standard, the data acquisition and processing system carries out online calibration on the detected online pH meter; the utility model discloses need not use low conductivity pH standard water sample preparation facilities to produce standard water sample, also need not dismantle the examined online pH table, whole testing process is simple, convenient, swift.
Description
Technical Field
The utility model belongs to the online chemical instrument inspection field of power plant steam system relates to an accuracy inspection method of online pH table of power plant steam system.
Background
The online pH meter is a key chemical meter in chemical supervision of a water vapor system of a power plant, so that the online pH meter is ensured to be accurately measured, the measured value is controlled to be within a qualified range, and the corrosion problem of thermal equipment can be effectively prevented. The measurement accuracy of the online pH meter of the water vapor system is influenced by not only online factors (flowing potential, a ground loop and the like) but also pure water factors (liquid junction potential, temperature compensation and the like), so that the DL/T677 plus 2018 'Power plant online chemical instrument test regulation' stipulates that an online test method is adopted for the online pH meter with the conductivity value of the measured water vapor system being not more than 100 mu S/cm. At present, the online accuracy test method of the online pH meter is a method for generating a standard water sample by using a low-conductivity pH standard water sample preparation device, and the online pH meter to be tested needs to be disassembled.
Disclosure of Invention
The utility model provides a simple and reliable power plant steam system online pH table accuracy test system need not use low conductivity pH standard water sample preparation facilities to produce standard water sample, also need not dismantle and is examined online pH table.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the accuracy testing system for the online pH meter of the water vapor system of the power plant comprises a standard conductivity meter 1 connected with the online pH meter to be tested in parallel and a data acquisition and processing system 2 connected with the output end of the standard conductivity meter 1.
The utility model discloses a power plant steam system accuracy test system's of online pH table inspection method, including following step:
1) the method comprises the following steps of connecting a standard conductivity meter 1 nearby with a detected online pH meter in parallel, wherein a water sample is the water sample when the detected online pH meter normally measures, the standard conductivity meter 1 and the detected online pH meter respectively measure the conductivity and the pH value of the water sample at the same time, and a data acquisition and processing system 2 acquires the conductivity measurement value of the standard conductivity meter 1;
2) the data acquisition and processing system 2 converts the conductivity measurements of the standard conductivity meter 1 in the principle of: the water quality purity of a water vapor system of a power plant is very high, a small amount of ammonia is contained, and a corresponding theoretical value between the pH value and the conductivity of low-concentration ammonia-containing pure water can be calculated through thermodynamic data, so that the conductivity measurement value of the standard conductivity meter 1 can be directly converted into the pH value;
3) and the data acquisition and processing system 2 calculates the whole machine indication value error of the detected online pH meter according to the converted pH value and the indication value of the detected online pH meter, if the error exceeds the standard, and performs online calibration on the detected online pH meter according to the specification of the detected online pH meter.
Compared with the prior art, the utility model have following advantage:
(1) the standard water sample is generated without using a low-conductivity pH standard water sample preparation device, and the time (more than 30 min) for waiting for a standard water sample flushing system is saved.
(2) The detected on-line pH meter does not need to be disassembled, the normal water sample measurement function of the detected pH meter during detection is not influenced, and the whole detection process is simple, convenient and quick.
Drawings
Fig. 1 is a schematic view of the inspection system of the present invention.
Wherein, 1 is a standard conductivity meter, and 2 is a data acquisition and processing system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the system for checking the accuracy of the online pH meter of the steam system of the power plant comprises: the standard conductivity meter 1 is connected with the pH meter to be detected in parallel, and the output end of the standard conductivity meter 1 is connected with the data acquisition and processing system 2.
The method for checking the accuracy of the online pH meter of the water vapor system of the power plant comprises the following steps:
1) and (3) connecting the standard conductivity meter 1 nearby with the detected online pH meter in parallel, wherein the water sample is the water sample when the detected online pH meter normally measures, and the standard conductivity meter 1 and the detected online pH meter respectively measure the conductivity and the pH value of the water sample at the same time. Conductivity measurements from the standard conductivity meter 1 are collected by the data acquisition and processing system 2.
2) The data acquisition and processing system 2 converts the conductivity measurements of the standard conductivity meter 1 in the principle of: the water quality purity of a water vapor system of a power plant is very high, a small amount of ammonia is contained, and the corresponding theoretical value between the pH value and the conductivity of the low-concentration ammonia-containing pure water can be calculated through thermodynamic data, so that the conductivity measurement value of the standard conductivity meter can be directly converted into the pH value.
3) And the data acquisition and processing system 2 calculates the whole machine indication value error of the detected online pH meter according to the converted pH value and the indication value of the detected online pH meter, if the error exceeds the standard, and performs online calibration on the detected online pH meter according to the specification of the detected online pH meter.
The utility model discloses final purpose provides a simple reliable steam system online pH table accuracy test method and system for power plant's chemical instrumentation operation maintainer, only with very short time, just can realize the online inspection of the online pH table accuracy of steam system, improves the measurement accuracy of online pH table, and is significant to preventing that steam system metal from corroding, guaranteeing generating set safety and economy operation.
Claims (1)
1. The utility model provides an accuracy test system of online pH table of power plant steam system which characterized in that: the online pH meter detection system comprises a standard conductivity meter (1) connected with a detected online pH meter in parallel and a data acquisition and processing system (2) connected with the output end of the standard conductivity meter (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920860413.5U CN210894193U (en) | 2019-06-10 | 2019-06-10 | Accuracy inspection system of online pH table of power plant steam system |
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| CN201920860413.5U CN210894193U (en) | 2019-06-10 | 2019-06-10 | Accuracy inspection system of online pH table of power plant steam system |
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| CN210894193U true CN210894193U (en) | 2020-06-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208328A (en) * | 2019-06-10 | 2019-09-06 | 西安热工研究院有限公司 | A kind of Test of accuracy system and method for the online pH table of power plant water-steam system |
| CN112946027A (en) * | 2021-03-11 | 2021-06-11 | 烟台方心水处理设备有限公司 | pH on-line detection method for super-alkaline electrolyzed water |
-
2019
- 2019-06-10 CN CN201920860413.5U patent/CN210894193U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208328A (en) * | 2019-06-10 | 2019-09-06 | 西安热工研究院有限公司 | A kind of Test of accuracy system and method for the online pH table of power plant water-steam system |
| CN112946027A (en) * | 2021-03-11 | 2021-06-11 | 烟台方心水处理设备有限公司 | pH on-line detection method for super-alkaline electrolyzed water |
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