Method for testing content of impurity cations in ammonia water reagent for water supply treatment of power plant
A technology for water supply treatment and testing methods, applied in measuring devices, material separation, instruments, etc., can solve the problems of long consumption time, low work efficiency, large amount of test operations, etc., and achieve high efficiency, convenient operation and high accuracy. Effect
Pending Publication Date: 2021-10-08
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology
[0005] The above-mentioned different cation content determination processes need to draw standard working curves separately, and change the test conditions of the instruments one by one. The whole process of test operation is large, time-consuming, data processing is complicated, work efficiency is low, and operability that affects the accuracy of test data is prone to occur. question
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0039] The concrete process of this embodiment is:
[0040] 1) Use the subtraction method to weigh 20g of ammonia water sample, put it in a beaker, then evaporate and concentrate in a fume hood, do not boil and splash during the evaporation process, concentrate to 5mL and then cool, then transfer to a 100mL volumetric flask with high-purity water;
[0041] 2) Debugging the ion chromatograph, wherein the debugging water is deionized water with a resistivity of 18.3MΩ·cm.
[0042] 3) Set working conditions, among which, cation analysis column: IonPac CS12A, CG12A, 2mm; methanesulfonic acid eluent: isocratic leaching: 0-20min, 18mmol / L MSA; suppressor: CSRS 2mm, automatic suppression mode; Flow rate: 0.30mL / min; injection volume: 25μL.
[0043] 4) Prepare standard stock solution;
[0044] Sodium ion standard stock solution (as Na + Meter: 1000mg / L): Weigh 2.542g of sodium chloride, and then dissolve to 1L.
[0045] Magnesium ion standard stock solution (as Mg 2+ Calculation:...
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Abstract
The invention discloses a method for testing the content of impurity cations in an ammonia water reagent for water supply treatment of a power plant, which comprises the following steps: weighing an ammonia water sample, and preparing to-be-tested ammonia water by using the ammonia water sample; debugging the ion chromatograph; setting working conditions; mixing the sodium ion standard stock solution, the magnesium ion standard stock solution, the potassium ion standard stock solution and the calcium ion standard stock solution, and diluting to a constant volume to obtain an intermediate mixed standard solution; preparing N groups of mixed standard working solutions with different concentrations; analyzing each group of mixed standard working solutions with different concentrations by using an ion chromatograph, recording the appearance time of the mixed standard working solutions on the corresponding spectrogram, and then drawing a standard working curve by taking the peak area or the peak height as the ordinate and the concentration as the abscissa; and determining the cation content in the to-be-tested ammonia water according to the standard working curve. The method can accurately and quickly determine the cation content in the ammonia water reagent.
Description
technical field [0001] The invention relates to a test method, in particular to a test method for the content of impurity cations in ammonia water reagents for water treatment in power plants. Background technique [0002] The anticorrosion of the thermal system of thermal power plants often adopts the method of adding ammonia to the feed water to increase the pH value of the feed water within the appropriate alkaline range, thereby controlling the corrosion rate of metal materials in the water supply system, preventing acid corrosion caused by free carbon dioxide, and reducing feed water. and boiler water corrosion products, to ensure the qualified rate of unit steam water quality. [0003] However, if the ammonia water contains excessive cations (mainly referring to Na + 、K + , Mg 2+ , Ca 2+ ), these impurities will enter the furnace along with the pH adjustment process, and then directly affect the water vapor quality in the furnace. After long-term cycle operation, i...
Claims
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IPC IPC(8): G01N30/02G01N30/06G01N30/86
CPCG01N30/02G01N30/06G01N30/8641G01N2030/047
Inventor 王海莲郭丹彭章华王梦娇刘雨程
Owner XIAN THERMAL POWER RES INST CO LTD