Apparatus and method for testing resistance dew-point corrosion of evaluating material

Abstract

The present invention relates to a testing device and a testing method for evaluating the sulfuric acid dew point corrosion resistance quality of materials. The device adopts a structure that: an SO2 gas cylinder is connected with a drying tower and then is connected to a gas mixer through a flow meter; an air compressor passes through the drying tower, is connected with a bubbling bottle arranged in a constant temperature flume through the flow meter, and then is connected to the gas mixer; the mixer is serially connected with a heating furnace and a tail gas absorbing device; a ceramic crucible containing corrosion medium and a sample is placed inside the heating furnace 10. The device carries out evaluation through the weight change of the measured sample before and after an experiment, and the technical parameters during test are as follows: the air flow rate is 1000-2000 ml / min; the SO2 gas flow rate is 10-50 ml / min; the temperature of constant temperature water bath is controlled between 60 DEG C and 95 DEG C; the temperature of the heating furnace is controlled between 60 DEG C and 200 DEG C; the corrosion medium is concentrated sulfuric acid with the mass concentration of 80-90 percent; the experimental time is 24 hours.

Description

technical field [0001] The invention relates to a test device and a test method for evaluating the performance of anti-sulfuric acid dew point corrosion of materials. More specifically, the present invention quantitatively evaluates the pros and cons of different materials in terms of sulfuric acid dew point corrosion resistance by simulating the on-site working conditions of the convection section of the heating furnace, the economizer, and the boiler. technical background [0002] The gas after combustion of sulfur-containing fuel is used to heat the process medium or provide a certain amount of heat. Sulfur dioxide gas (SO 2 ), a part of the sulfur dioxide gas is oxidized to sulfur trioxide (SO 3 ), and then combined with water vapor in the gas to generate sulfuric acid (H 2 SO 4 ). Since the generated sulfuric acid will condense and cause corrosion at low temperature places such as exhaust gas preheaters, air preheaters, and flue ducts, this phenomenon is called sul...

AI Technical Summary

Problems solved by technology

The problem to be solved by the present invention is to establish a set of material dew point corrosion resistance evaluation device in the laboratory to overcome the inability of the existing laboratory to correctly evaluate the material dew point corrosion resistance

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