Method for detecting sulfur trioxide in coal ash

A technology of sulfur trioxide and coal ash, applied in the preparation of test samples, measuring devices, sampling, etc., can solve problems such as low results, achieve high accuracy and precision, improve accuracy and precision, and shorten The effect of testing time

Inactive Publication Date: 2017-04-05
SHANDONG ELECTRIC POWER RES INST +1
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The instrument is automated, but the poss

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  • Method for detecting sulfur trioxide in coal ash
  • Method for detecting sulfur trioxide in coal ash
  • Method for detecting sulfur trioxide in coal ash

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[0048] Example 1

[0049] A method for determining sulfur trioxide in coal ash includes the following steps:

[0050] 1. Treatment of coal ash samples and standard products:

[0051] Step (1): Weigh a certain amount of general analysis coal ash sample in the ash dish, and send the ash dish into the muffle furnace at a temperature not exceeding 100°C. Under the condition of natural ventilation and a 15mm gap in the furnace door, take 30 minutes Slowly rise to 500℃, keep at this temperature for 30min, raise to (815±10)℃, burn at this temperature for 2h.

[0052] Step (2): Take out and cool, use an agate mortar to grind the coal ash sample to a particle size of 0.075mm, then place it in a ash dish and burn it at (815±10)°C for 30 minutes until the quality is constant. Put into the ash sample bag.

[0053] Step (3): Take out an appropriate amount of anhydrous calcium sulfate, burn it at 500°C for 2h, and put it in a desiccator to cool to room temperature.

[0054] Step (4): Take the prepar...

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Abstract

The invention discloses a method for detecting sulfur trioxide in coal ash. The method comprises the following steps: processing a coal ash sample and a standard substance, establishing a standard curve, and detecting the sample; the processing step of the coal ash sample and the standard substance comprises: grinding a calcined and cooled coal ash sample into 0.070-0.080 mm by using an agate mortar, and calcining the ground coal ash sample until the mass is constant; the standard substance is a substance needed by establishment of the standard curve, and the standard substance is anhydrous calcium sulfate; the establishment of the standard curve is realized through detecting the anhydrous calcium sulfate with different masses by an infrared detector; and the detection step of the sample is completed through calculating the content of sulfur trioxide in the coal ash sample through combining a result of the detection of the processed coal ash sample by the infrared detector with the established standard curve. The method shortens the test time and reduces the test workload on the basis of guaranteeing the accuracy of the test result.

Description

technical field [0001] The invention belongs to the field of thermal power generation and relates to the detection of coal ash, in particular to a method for measuring sulfur trioxide in coal ash. Background technique [0002] Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants. The main oxide composition of fly ash in thermal power plants in my country is: SiO 2 、Al 2 o 3 , FeO, Fe 2 o 3 , CaO, TiO 2 Wait. The main source of fly ash is thermal power plants and urban central heating boilers fueled by pulverized coal, of which more than 90% are wet ash, which has lower activity than dry ash, and consumes water and electricity, pollutes the environment, and is not conducive to comprehensive use. Fly ash is mainly used in construction and other fields. Adding fly ash to concrete saves a lot of cement and fine aggregate; it increases the decorative properties of concrete. At p...

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Application Information

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IPC IPC(8): G01N1/28G01N21/3563
CPCG01N1/286G01N21/3563G01N2001/2866
Inventor 王超冷述博刘颖琳王东路于磊李翠
Owner SHANDONG ELECTRIC POWER RES INST
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