Power station water vapor multi-parameter cooperative measurement system and measurement method

Abstract

The invention belongs to the field of power station water vapor monitoring, and relates to a power station water vapor multi-parameter collaborative measurement system and method, the measurement system comprises a water sample inlet, a water sample outlet, a first conductivity sensor, a cation removal device, a second conductivity sensor, a desalting device, a membrane exchange device and a third conductivity sensor; the water sample inlet is communicated with the cation removal device through the first conductivity sensor; the cation removal device is respectively communicated with the second conductivity sensor and the desalting device; the second conductivity sensor and the desalting device are connected to the membrane exchange device; the membrane exchange device is communicated with the water sample outlet; the outlet of the membrane exchange device is communicated with the water sample outlet through a third conductivity sensor. The invention provides the power station water vapor multi-parameter cooperative measurement system and the measurement method which are accurate in measurement result and timely in measurement process feedback.

Description

technical field [0001] The invention belongs to the field of power station water vapor monitoring, and relates to a power station water vapor multi-parameter collaborative measurement system and a measurement method. Background technique [0002] The water vapor quality standard of thermal power plants is an important basis for chemical supervision and an important means to ensure the safe and economical operation of power generation equipment. With the continuous operation of high-parameter, large-capacity units and new water treatment equipment in thermal power plants, the water vapor quality standard for thermal power plants (GB / T12145) puts forward higher requirements for the water vapor quality of thermal power plants. The specific conductivity, hydrogen conductivity, degassed hydrogen conductivity, pH, and ammonia content have detailed parameter requirements. [0003] For the specific conductivity, the determination of its value has a direct relationship with the flow...

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Problems solved by technology

The temperature of the boiling method is high and dangerous, and the measurement results need to be compensated accordingly to obtain the correct degassed hydrogen conductivity after compensation, which will inevitably affect the actual value of the degassed hydrogen conductivity

For the membrane method, when the content of carbon dioxide in the water vapor is relatively small, it cannot be completely removed, and it will also affect the measured value of the degassed hydrogen conductivity

Due to the extremely low content of carbon dioxide in the water vapor of the power station, it is difficult to completely remove it by boiling method and membrane method, and the conductivity of degassed hydrogen is also measured after removing cations from the water sample with a cation exchange resin column. There are also many problems in the measurement of hydrogen conductivity.

[0006] At the same time, pH is an important indicator to control the anticorrosion of the water vapor system, but the measurement accuracy of pH is poor, especially when the temperature deviates from the standard temperature, the pH measurement accuracy of ammonia-containing pure water is even worse, which will seriously affect the anticorrosion of the water vapor system equipment, and the pH electrode needs Regular replacement, high operation and maintenance costs

[0007] The ammonia content in the water vapor system is generally measured by the Nessler reagent method, which is highly toxic and the steps are cumbersome

[0008] In summary, the existing measurement methods, pH, specific conductivity, hydrogen conductivity and degassed hydrogen conductivity need to use four water samples and four online instruments for measurement, and due to many problems in the measurement process, pH, Specific conductivity, hydrogen conductivity and degassed hydrogen conductivity are difficult to measure accurately, which affects the safe operation of thermal equipment

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