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On-line testing method for sodium analyzer

A detection method and sodium meter technology, which is applied in the field of online sodium meter detection, can solve problems such as failure to improve steam quality, steam turbine blade salt accumulation, inability to timely and accurately reflect water quality changes, and hidden dangers of unit safety and economic operation. Achieve the effects of enhancing measurement reliability, reducing measurement errors, and reducing corrosion

Inactive Publication Date: 2011-11-02
ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER +1
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Problems solved by technology

This shows that the current online sodium meter detection method cannot accurately reflect the changes in water quality in a timely manner, and cannot improve the steam quality and reduce the salt accumulation on the turbine blades, especially when the value is too small, which undoubtedly brings great harm to the safe and economical operation of the unit. Hidden danger

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  • On-line testing method for sodium analyzer
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  • On-line testing method for sodium analyzer

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Embodiment Construction

[0008] 1. Statistical analysis of the measurement results of the known sodium ion concentration when concentrated ammonia water and diisopropylamine are used as alkalization reagents, see Table 1.

[0009] Table 1

[0010]

[0011] Since the background water of the prepared sodium standard solution is demineralized water, the closer the measurement error is to the sodium ion content of the background water, the higher the measurement accuracy of the instrument and the better the reliability. It can be drawn from Table 1 that as alkalization reagents, diisopropylamine and concentrated ammonia water can make the pH value of the water sample after alkalization 3 greater than the pNa value. The error varies. When concentrated ammonia water is used as an alkalizing reagent, the difference between the measurement error and the sodium ion of the background water is as high as 4.83; when diisopropylamine is used as an alkalizing reagent, the measured data of the instrument is rela...

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Abstract

The invention provides an on-line testing method for a sodium analyzer. 65-75wt% diisopropylamine and 45-55wt% diisopropylamine are respectively used as the alkali agents for air-ventilating and alkali-adding on-line testing for the sodium analyzer and air-evacuating and alkali-adding on-line testing for the sodium analyzer. The method is capable of not only meeting the requirement of the sodium ions testing for water alkalinity but also reducing the instrument testing error so as to improve the instrument testing reliability. In addition, the correct values of sodium ions testing can help an operator to discover the problems of aqueous vapor quality control and adjust the work mode promptly, thereby reducing the corrosion, scale formation and salification of each machine set each year, so as to avoid an economic loss of millions of Yuan, have a significant importance in the safe and economical operation of a power plant as well as save energy and reduce consumption.

Description

1. Technical field [0001] The invention relates to a method for supervising steam quality in a thermal system of a thermal power plant, in particular to a method for detecting an online sodium meter. 2. Background technology [0002] The sodium ion content in the thermal system of a thermal power plant is an important control parameter for monitoring steam quality, identifying leakage of condensers, monitoring the working conditions of cation exchangers, and performing raw water analysis. It can directly reflect the degree of salt accumulation corrosion of thermal equipment. Therefore, in order to prevent scaling, salt accumulation, slow down the corrosion of metal parts in the system, and ensure the safe and economical operation of the system, the sodium ion content in the water vapor system of the power plant must be strictly controlled and monitored online. At present, sodium meters are commonly used for online measurement, Undertake the task of real-time monitoring of so...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 车小云郑敏聪徐红斌侯昌伟
Owner ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER
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