Online trace iron determination device and method based on phenanthroline spectrophotometry

Abstract

The invention discloses an online trace iron determination device and method based on phenanthroline spectrophotometry. The online trace iron determination device comprises a detection system, a dosing system and a control system. The detection system comprises a flow pump, a heater, a cooler, a concentration column, a first flow cell, a second flow pump, a second flow cell, a third flow pump, a visible light detector, a first waste liquid pool and a second waste liquid pool. The dosing system comprises a hydrochloric acid medicine tank, a hydroxylamine hydrochloride medicine tank, a phenanthroline medicine tank, an ammonia water medicine tank, an ammonium acetate medicine tank, a first micro pump, a second micro pump, a third micro pump, a fourth micro pump, a fifth micro pump and a tee joint. The control system comprises an interlocking control display screen, a first flow pump control module, a second flow pump control module, a third flow pump control module, a first micro pump control module, a second micro pump control module, a third micro pump control module, a fourth micro pump control module and a fifth micro pump control module. According to the invention, online trace iron detection of a thermal power plant water vapor system can be realized, The device and the method have the characteristics of rapidness, accuracy, reliability and the like, and greatly improve thedetection limit.

Description

technical field [0001] The invention relates to the technical field of water chemistry detection in power plants, in particular to an online trace iron determination device and method based on o-phenanthroline spectrophotometry. Background technique [0002] The water vapor quality of a thermal power plant is an important parameter for operation control, and the iron content of corrosion products in the water vapor system is the only chemical monitoring index for evaluating the corrosion degree of water vapor system equipment. For high parameter units, the expected value of iron content at the inlet of the water vapor system economizer is required to be less than 3 μg / L , the minimum detection limit of o-phenanthroline spectrophotometry is 5 μg / L, and manual sampling and laboratory analysis are required, which takes a long time, and the measurement results are time-delayed and cannot be measured online. If there is corrosion in the water vapor system, it cannot be processed i...

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Problems solved by technology

[0002] The water vapor quality of a thermal power plant is an important parameter for operation control, and the iron content of corrosion products in the water vapor system is the only chemical monitoring index for evaluating the corrosion degree of water vapor system equipment. For high-parameter units, the expected value of iron content at the inlet of the water vapor system economizer is required to be less than 3 μg / L , the minimum detection limit of o-phenanthroline spectrophotometry is 5 μg / L, and manual sampling and laboratory analysis are required, which takes a long time, and the measurement results are time-delayed and cannot be measured online. If there is corrosion in the water vapor system, it cannot be processed in time

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