Nephelometry based method for detecting iron content in thermodynamic media

Abstract

The invention relates to a method for detecting the iron content in thermodynamic media such as water and steam and particularly relates to a nephelometry based method for detecting the iron content in the thermodynamic media. The method overcomes the technology bias of technicians in the field and adopts nephelometry to substitute for spectrophotometry to detect the iron content in the thermodynamic media. The nephelometry is simple in detection procedure, short in detection time and fast in detection speed, the detection of a sample can be finished in tens of seconds, the requirements for a plurality of points to be sampled and the quick change of the iron content in the water sample at the starting phase of a unit can be met, the quality of the water and the steam can be supervised timely and effectively, used chemical reagents are only used when a correlative equation of the iron content and the turbidity is obtained, and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to a method for detecting iron content in thermal media such as water and steam, in particular to a method for detecting iron content in thermal media based on a turbidity method. Background technique [0002] During the start-up stage of thermal power plant units (especially units during infrastructure construction), cold and hot water flushing should be carried out in sequence according to the commissioning regulations. standard; for this reason, it is necessary to detect the iron content in the thermal medium (water, steam) according to the commissioning regulations and corresponding industry standards. The standard method for iron content detection is spectrophotometry. All the iron in the sample is converted into trivalent iron ions, and then the color is developed with the corresponding developer, and then compared with a series of standard samples of known concentration by spectrophotometry to obtain the iron content. For ...

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Problems solved by technology

[0003] The spectrophotometric method to detect the iron content in the thermal medium has the main disadvantages of complicated procedures, long test time (generally about 20 minutes for a single sample test without a standard sample), and potential pollution; There are many points (including condensate water, feed water, drain water, boiler water, saturated steam, superheated steam, etc.), the iron content in water samples changes rapidly, and the time lag in the results of iron measurement by spectrophotometry is long. It is difficult to monitor the quality of water vapor in time, which affects the unit start-up, needs to be improved for rapid detection of iron content in water samples