CN210894193U - An accuracy test system for on-line pH meter of water vapor system in power plant - Google Patents
An accuracy test system for on-line pH meter of water vapor system in power plant Download PDFInfo
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Abstract
一种发电厂水汽系统在线pH表的准确性检验系统，该系统包括与被检在线pH表并联连接的标准电导率表，与标准电导率表输出端连接的数据采集和处理系统；检验方法为：1)将标准电导率表就近与被检在线pH表并联连接，水样为被检在线pH表正常测量时的水样，由数据采集和处理系统采集标准电导率表的电导率测量值；2)数据采集和处理系统将标准电导率表的电导率测量值转换为pH值；3)数据采集和处理系统根据转换后的pH值和被检在线pH表的示值，计算出被检在线pH表的误差，如误差超标，则对被检在线pH表进行在线校准；本实用新型不需要使用低电导率pH标准水样制备装置产生标准水样，也不需要拆卸被检在线pH表，整个检验过程简单、方便、快捷。
An accuracy inspection system for an online pH meter of a water vapor system in a power plant, the system includes a standard conductivity meter connected in parallel with the tested online pH meter, and a data acquisition and processing system connected with the output end of the standard conductivity meter; the inspection method is as follows: : 1) Connect the standard conductivity meter in parallel with the tested online pH meter nearby, the water sample is the water sample when the tested online pH meter is normally measured, and the conductivity measurement value of the standard conductivity meter is collected by the data acquisition and processing system; 2) The data acquisition and processing system converts the conductivity measurement value of the standard conductivity meter into pH value; 3) The data acquisition and processing system calculates the detected online pH value according to the converted pH value and the indicated value of the tested online pH meter. If the error of the pH meter exceeds the standard, the online pH meter to be tested is calibrated online; the utility model does not need to use a low-conductivity pH standard water sample preparation device to generate standard water samples, nor does it need to disassemble the tested online pH meter, The whole inspection process is simple, convenient and fast.
Description
技术领域technical field
本实用新型属于发电厂水汽系统在线化学仪表检验领域，涉及一种发电厂水汽系统在线pH表的准确性检验方法。The utility model belongs to the field of on-line chemical instrument inspection of a water vapor system of a power plant, and relates to a method for testing the accuracy of an on-line pH meter of a water vapor system of a power plant.
背景技术Background technique
在线pH表是发电厂水汽系统化学监督中的关键化学仪表，确保在线pH表测量准确，并控制其测量值在合格范围内，可有效防止热力设备的腐蚀问题。水汽系统的在线pH表测量准确性不仅受在线因素(流动电位、地回路等)影响，还受纯水因素(液接电位、温度补偿等)影响，所以DL/T 677-2018《发电厂在线化学仪表检验规程》规定对于测量水汽系统电导率值不大于100μS/cm的在线pH表，应采用在线检验方法。目前，在线pH表的在线准确性检验方法是使用低电导率pH标准水样制备装置产生标准水样法，需要拆卸被检在线pH表。The online pH meter is the key chemical instrument in the chemical supervision of the water vapor system of the power plant. It ensures the accurate measurement of the online pH meter and controls the measured value within the qualified range, which can effectively prevent the corrosion of thermal equipment. The measurement accuracy of the online pH meter of the water vapor system is not only affected by online factors (flow potential, ground loop, etc.), but also by pure water factors (liquid junction potential, temperature compensation, etc.), so DL/T 677-2018 "Power Plant Online" "Chemical Instrument Inspection Regulations" stipulates that for the online pH meter measuring the conductivity value of the water vapor system not greater than 100μS/cm, the online inspection method should be adopted. At present, the online accuracy test method of the online pH meter is to use a low-conductivity pH standard water sample preparation device to generate a standard water sample, which requires disassembly of the online pH meter to be inspected.
发明内容SUMMARY OF THE INVENTION
本实用新型提供了一种简单可靠的发电厂水汽系统在线pH表准确性检验系统，不需要使用低电导率pH标准水样制备装置产生标准水样，也不需要拆卸被检在线pH表。The utility model provides a simple and reliable online pH meter accuracy test system for the water vapor system of a power plant, which does not require the use of a low-conductivity pH standard water sample preparation device to generate standard water samples, nor does it need to disassemble the detected online pH meter.
为达到上述目的，本实用新型采用如下技术方案：To achieve the above object, the utility model adopts the following technical solutions:
一种发电厂水汽系统在线pH表的准确性检验系统，包括与被检在线pH表并联连接的标准电导率表1，与标准电导率表1输出端连接的数据采集和处理系统2。An accuracy inspection system for an online pH meter of a water vapor system in a power plant, comprising a standard conductivity meter 1 connected in parallel with the tested online pH meter, and a data acquisition and
本实用新型所述的发电厂水汽系统在线pH表的准确性检验系统的检验方法，包括以下步骤：The inspection method of the accuracy inspection system of the online pH meter of the water vapor system of the power plant according to the utility model comprises the following steps:
1)将标准电导率表1就近与被检在线pH表并联连接，水样为被检在线pH表正常测量时的水样，标准电导率表1和被检在线pH表分别同时测量水样电导率和pH值，由数据采集和处理系统2采集标准电导率表1的电导率测量值；1) Connect the standard conductivity meter 1 with the tested online pH meter in parallel, and the water sample is the water sample when the tested online pH meter is normally measured. The standard conductivity meter 1 and the tested online pH meter measure the conductivity of the water sample at the same time. rate and pH value, the conductivity measurement value of the standard conductivity table 1 is collected by the data acquisition and
2)数据采集和处理系统2对标准电导率表1的电导率测量值进行转换，原理为：发电厂水汽系统的水质纯度很高，含有少量氨，通过热力学数据可计算得到低浓度含氨纯水的pH值和电导率之间的对应理论值，即可直接将标准电导率表1的电导率测量值转换为pH值；2) The data acquisition and
3)数据采集和处理系统2根据转换后的pH值和被检在线pH表的示值，计算出被检在线pH表的整机示值误差，如误差超标，按照被检在线pH表说明书，对被检在线pH表进行在线校准。3) The data acquisition and
本实用新型与现有技术相比具有如下优点：Compared with the prior art, the utility model has the following advantages:
(1)不需要使用低电导率pH标准水样制备装置产生标准水样，省去等待标准水样冲洗系统的时间(30min以上)。(1) There is no need to use a low-conductivity pH standard water sample preparation device to generate a standard water sample, which saves the time (more than 30 minutes) waiting for the standard water sample to flush the system.
(2)不需要拆卸被检在线pH表，不影响被检pH表在检验期间的测量正常水样功能，整个检验过程简单、方便、快捷。(2) There is no need to disassemble the tested online pH meter, and it does not affect the normal water sample measurement function of the tested pH meter during the inspection. The entire inspection process is simple, convenient and fast.
附图说明Description of drawings
图1为本实用新型检验系统示意图。FIG. 1 is a schematic diagram of the inspection system of the present invention.
其中，1为标准电导率表，2为数据采集和处理系统。Among them, 1 is the standard conductivity meter, and 2 is the data acquisition and processing system.
具体实施方式Detailed ways
下面结合附图对本实用新型做进一步详细描述：Below in conjunction with accompanying drawing, the utility model is described in further detail:
参考图1，本实用新型所述的发电厂水汽系统在线pH表准确性检验系统包括：标准电导率表1与被检在线pH表并联连接，标准电导率表1的输出端与数据采集和处理系统2相连。Referring to Figure 1, the power plant water vapor system online pH meter accuracy test system of the present invention includes: a standard conductivity meter 1 is connected in parallel with the tested online pH meter, and the output end of the standard conductivity meter 1 is connected with data acquisition and processing.
本实用新型所述的发电厂水汽系统在线pH表准确性检验方法包括以下步骤：The method for checking the accuracy of the on-line pH meter of the water vapor system of the power plant according to the present invention comprises the following steps:
1)将标准电导率表1就近与被检在线pH表并联连接，水样为被检在线pH表正常测量时的水样，标准电导率表1和被检在线pH表分别同时测量水样电导率和pH值。由数据采集和处理系统2采集标准电导率表1的电导率测量值。1) Connect the standard conductivity meter 1 with the tested online pH meter in parallel, and the water sample is the water sample when the tested online pH meter is normally measured. The standard conductivity meter 1 and the tested online pH meter measure the conductivity of the water sample at the same time. rate and pH. The conductivity measurements of the standard conductivity meter 1 are acquired by the data acquisition and
2)数据采集和处理系统2对标准电导率表1的电导率测量值进行转换，原理为：发电厂水汽系统的水质纯度很高，含有少量氨，通过热力学数据可计算得到低浓度含氨纯水的pH值和电导率之间的对应理论值，即可直接将标准电导率表的电导率测量值转换为pH值。2) The data acquisition and
3)数据采集和处理系统2根据转换后的pH值和被检在线pH表的示值，计算出被检在线pH表的整机示值误差，如误差超标，按照被检在线pH表说明书，对被检在线pH表进行在线校准。3) The data acquisition and
本实用新型最终目的是为电厂化学仪表运行维护人员提供一种简单可靠的水汽系统在线pH表准确性检验方法及系统，只用很短的时间，就能实现水汽系统在线pH表准确性的在线检验，提高在线pH表的测量准确性，对于防止水汽系统金属腐蚀、保证发电机组安全经济运行具有重要意义。The ultimate purpose of the utility model is to provide a simple and reliable method and system for checking the accuracy of the online pH meter of the water vapor system for the operation and maintenance personnel of the chemical instrument of the power plant. It is of great significance to prevent the metal corrosion of the water vapor system and ensure the safe and economical operation of the generator set to improve the measurement accuracy of the online pH meter.
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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 |
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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 |
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