High-temperature corrosion prediction and service life evaluation method for boiler water wall
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A technology for high-temperature corrosion and life assessment, applied in combustion methods, weather resistance/light resistance/corrosion resistance, measuring devices, etc. Accuracy, assessing the effect of accurate results
Active Publication Date: 2020-02-14
JIANGSU FRONTIER ELECTRIC TECH +1
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The factors affecting high temperature corrosion of the water cooling wall are simply weighted and graded completely through mathematical methods, without
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specific Embodiment 1
[0026] to combine figure 1 , the present invention proposes a method for predicting high temperature corrosion of boiler water wall and evaluating its life, comprising the following steps:
[0027] Step 1. Establish and simplify the high temperature corrosion reaction model of the water wall, determine the main chemical reactions of the corrosion reaction and the main factors affecting the reaction rate.
[0028] Step 2, according to the reaction model established in step 1, combined with the reaction mechanism of the corrosion reaction, determine H 2 Diffusion rate and chemical reaction rate of S at the reaction interface.
[0029] Step 3, calculate the change of metal thickness during the corrosion process by the principle of conservation, and establish the functional relationship between the physical quantity of corrosion and time.
[0030] Step 4, according to the safe operation requirements of the water wall of the power plant boiler, establish the corrosion life evalua...
specific Embodiment 2
[0073] For a 630MW supercritical four-corner tangential circle coal-fired boiler, according to the measured data of its benchmark working conditions, H in the corrosive atmosphere 2 The concentration of S gas is selected as 180mg / Nm 3 , 120mg / Nm 3 , 60mg / Nm 3 ; The temperature of the wall surface of the water-cooled wall is selected from the temperature of the pipe wall under full-load operation, and its value is 723K; the initial thickness of the metal of the water-cooled wall is 0.0075m.
[0074] Substituting the above parameters, the functional relationship expression of the average metal corrosion rate X and time t can be obtained:
[0075] t=2.41×10 7 x 2 +0.418×10 7 X C o =180mg / Nm 3
[0076] t=3.61×10 7 x 2 +0.628×10 7 X C o =120mg / Nm 3
[0077] t=7.23×10 7 x 2 +1.26×10 7 X C o =60mg / Nm 3
[0078] At the same time, combined with the relevant provisions of boiler design specifications and supervision regulations, for conservative considerations, the m...
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Abstract
The invention discloses a high-temperature corrosion prediction and service life evaluation method for a boiler water wall. The method comprises the following steps that a water wall high-temperaturecorrosion reaction model is established, and a chemical reaction of the corrosion reaction and the influence factors influencing the reaction rate are determined; the diffusion rate and the chemical reaction rate of the H2S in the reaction interface are determined by combining the reaction mechanism of the corrosion reaction; the change rule of the thickness of a metal matrix of the boiler water wall in the corrosion process is calculated through the conservation principle, and a function relationship between the corrosion physical quantity and the time is established; and the corrosion service life evaluation criterion is established according to the safe operation requirement of the water wall of a power station boiler, and the maximum service life of the metal matrix of the water wall under the specified condition is calculated. According to the method, the mathematical model of the corrosion physical quantity which is changed along the time can be established based on the chemicalreaction mechanism and mathematical derivation and combined with mathematical statistics theory, moreover, the service life evaluation of a water wall pipeline is carried out, the influence weight ofthe temperature and the H2S concentration on the corrosion service life is comprehensively considered, and the high-temperature corrosion remaining service life time of the water wall pipeline is determined.
Description
technical field [0001] The invention relates to the technical field of safe operation of large-scale power plant boilers, in particular to a method for predicting high-temperature corrosion of a boiler water wall and evaluating its life. Background technique [0002] In order to reduce the emission of pollutants from coal-fired power plants, major power plants have generally carried out "ultra-low emission" transformation. Among them, in order to control the emission of NOX, the method of density difference combustion and air staged combustion is usually used to reduce the generation of NOX in the furnace, which is very easy to form a strong reducing atmosphere. Some power plants burn high-sulfur coal in order to reduce fuel costs. When the fuel is heated in a reducing atmosphere, a large amount of ferrous sulfide, atomic sulfur and hydrogen sulfide are released. Atomic sulfur and hydrogen sulfide gas can penetrate through the loose iron oxide layer and undergo sulfidation ...
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