Method and device for measuring insoluble iron content in thermal system of thermal power plant unit
A technology of insoluble iron and thermal power plants, which is applied in the direction of weighing by removing certain components, can solve the problems of high price, low iron content in soda water, and the inability to realize continuous iron monitoring, etc., and achieve low cost of equipment, The effect of continuous monitoring
Active Publication Date: 2018-01-02
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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Problems solved by technology
Therefore, although the indication value is accurate when the instrument is calibrated, it is difficult to simulate the insoluble colloidal iron oxide in the actual thermal system, resulting in the false impression that the iron content in the soda water of the thermal system is very low
[0007] 2) Continuous monitoring of iron cannot be realized. Power generation companies usually monitor once a week or two, and the data will be accidental
[0008] 3) Although the online iron meter can realize the continuous monitoring of iron, due to the immature technology development, the application range is small, and the price is expensive, and it is still limited to the monitoring of dissolved ionic iron
The overhaul period of the unit is long, and the daily detection of iron ion concentration cannot reflect the real source of scaling and salt accumulation, and cannot truly reflect the corrosion protection effect of the thermal system
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Embodiment 1
[0028] For a 600MW unit, the water supply adopts AVT(R) treatment method. During the unit overhaul inspection, it was found that the deposition rate of the water wall, economizer, and steam turbine blades was relatively high, and the scaling rate of the water wall toward the fire side was 95 g / (m 2 a), the fouling rate of the economizer to the smoke side is 73 g / (m 2 ·a), the maximum rate of salt accumulation on the blades of the high-pressure cylinder of the steam turbine is 5.4mg / (cm 2 • a). In order to reduce the deposition rate and improve the safety and economy of unit operation, after the unit is chemically cleaned, the feed water of the unit is subjected to oxidation treatment. After two years of oxidation treatment, the unit is overhauled and inspected. The scale rate is 34 g / (m 2 ·a), the fouling rate of the economizer to the smoke side is 29 g / (m 2 ·a), the maximum salt accumulation rate of the blades of the high-pressure cylinder of the steam turbine is 1.4mg / (c...
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Abstract
The invention relates to a method for measuring the content of insoluble iron in the thermal system of a thermal power plant unit, which includes the following steps: 1) A branch is set on the steam-water sampling pipeline to be measured in the thermal system, and a flow meter, micro Porous filter membrane and differential pressure transmitter; 2) Clean the branch pipeline, let the water sample enter the branch pipeline, record the pressure difference change or the weight gain of the microporous filter membrane under a certain cumulative flow rate, and follow the steps below The formula calculates the colloidal iron fouling index ICFDΔp or ICFDΔm: In the formula: Δp—pressure difference, Pa; S—the effective area of the water sample passing through the microporous membrane, cm2; V—the cumulative flow rate of the water sample passing through the microporous membrane, m3; Δm—the weight gain of the microporous membrane before and after the water sample passes through, g. The method and device of the invention can accurately, reliably and continuously monitor the content of non-soluble colloidal and granular iron oxide, and truly reflect the corrosion protection effect and deposition level of the thermal system.
Description
technical field [0001] The invention belongs to the technical field of boiler feed water treatment for coal-fired units, and in particular relates to a method and device for measuring the content of insoluble iron in a thermal system of a thermal power plant unit. Background technique [0002] Water vapor is the circulating working medium of the thermal equipment of thermal power generating units, and the quality of water vapor is of great significance to the corrosion protection, operating life and safe and economical operation of thermal equipment. GB / T 12145-2008 "Water Vapor Quality of Thermal Power Generating Units and Steam Power Equipment" clearly stipulates various indicators of soda water quality. Among them, the iron content in the thermal system represents the corrosion effect of the equipment, is one of the important indicators for monitoring, and is also one of the key tasks of chemical supervision. Unit overhaul inspection, water wall, economizer pipe cutting,...
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IPC IPC(8): G01N5/04
Inventor 吴文龙张小霓常亮
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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