Method for determining sulfur trioxide content in coal ash

Abstract

The invention discloses a method for determining SO3 content in coal ash, which comprises the following steps: acquiring a fly ash sample in a boiler, ashing the fly ash sample and determining the SO3content, wherein (1) the boiler is a one-dimensional flame furnace, and a boiler body consists of a tapered furnace top and an electric heating furnace of six levels which can control the wall temperature respectively; (2) during acquiring the sample, the working conditions of the boiler comprise that the feeding heat quantity is 23.03 MJ / h, the total feeding air quantity is 7.07 Nm<2> / h, the primary air rate is 54 percent, the primary air temperature is 22 DEG C, the secondary air rate is 46 percent, the secondary air temperature is 120 DEG C, and the volume thermal load of a hearth is 523 MJ / m<2>h; the electric heating control minimum wall temperatures of the levels are 900 DEG C at the first level, 1,100 DEG C at the second level, 1,200 DEG C at the third level, 1,200 DEG C at the fourth level, 1,100 DEG C at the fifth level and 1,000 DEG C at the sixth level respectively; and the feeding air coefficient is 1.25; and (3) the sample is sampled at a fly ash sampling hole of the sixthlevel of the boiler. The fly ash components determined by the method of the invention are closer to the actually burnt fly ash components in an electric power plant, and the determination result hasactual guidance meaning for the quality and utilization of the fly ash.

Description

technical field [0001] The invention relates to a method for measuring the content of sulfur trioxide in coal ash. Background technique [0002] At present, coal ash sample preparation and determination of sulfur trioxide in coal ash are carried out according to the national standard GB / T1574-1995 test method of "Compilation of Fuel Standards for Electric Power" (2nd Edition). In the process of coal ash preparation, after the coal sample is ashed according to the specified ashing conditions (the temperature of the muffle furnace is 815°C), the total sulfur (iron sulfide sulfur, organic sulfur and sulfate sulfur) in the coal can remove sulfate The sulfur is not decomposed and stored in the ash, and the rest of the sulfur enters the air after combustion and is discharged through the chimney of the muffle furnace. Then, during the analysis of the chemical composition of the coal ash, the coal ash was held at a high temperature of 1300° C. for 120 seconds, so that the sulfate s...

AI Technical Summary

Problems solved by technology

At present, the conditions of raw coal ashing used in the laboratory are different from those of the fly ash produced by the boiler operation. The existing standard detects that the sulfur trioxide in the ash is too high, which cannot represent the content of sulfur trioxide in the fly ash during the boiler operation.

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