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2023-07-06 0 Views

: The principle of the sulfur meter

The sulfur determination device consists of an air purifier, a controller, an incinerator, an electrolytic cell and a stirrer. Hr1Textile Testing Instruments, Testing Equipment Manufacturer


It is mainly used to determine the total sulfur content in coal, steel and various minerals. The preferred basic equipment. Hr1Textile Testing Instruments, Testing Equipment Manufacturer


Analysis principleHr1Textile Testing Instruments, Testing Equipment Manufacturer


The coal sample is burned in the purified air flow under the high temperature condition of 1150 °C, and all the sulfur in the coal is removed and destroyed. It is decomposed by combustion and carried by the airflow into the electrolytic cell where it combines with water to form H2SO3 as it destroys the dynamic equilibrium of the original iodine-iodide ion pair in the electrolytic cell;Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The device outputs power immediately. Iodine is generated by the electrolysis of potassium iodide solution to restore the original dynamic equilibrium represented by the coulometric titration in IOS214-1996.Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The amount of current needed to restore the original dynamic equilibrium is directly related to the amount of burned and decomposed sulfur in the coal sample, which can be measured and calculated by the microprocessor. So we can determine the total sulfur content in coal. Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The coal sample is burned in the cleaned air flow at a high temperature of 1150 °C, whereby various forms of sulfur in the coal are decomposed into SO2 and a small amount of SO3 and escape. The reaction is as follows:Hr1Textile Testing Instruments, Testing Equipment Manufacturer


Coal (organic matter) + O2→CO2 ↑+H2O+SO2 ↑+CI2 ↑+...Hr1Textile Testing Instruments, Testing Equipment Manufacturer


4FeS2+11O2→2Fe2O3 +8SO2 ↑Hr1Textile Testing Instruments, Testing Equipment Manufacturer


2ΜSO4→2MO+2SO2 ↑+O2 ↑ (M refers to metal elements)Hr1Textile Testing Instruments, Testing Equipment Manufacturer


2SO2+O2→ 2SO3 ↑Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The generated SO2 and a small amount of SO3 are brought into the electrolysis cell by the air flow and combine with water to form H2SO3 and a small amount of H2SO4, which destroy the equipotential bondingof iodine-potassium iodide pair, and the device instantly dissolves potassium iodide and generates iodine through automatic electrolysis to titrate H2SO3 through oxidation. Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The reaction formula is:Hr1Textile Testing Instruments, Testing Equipment Manufacturer


anode;2I-–2e→I2Hr1Textile Testing Instruments, Testing Equipment Manufacturer


cathode;2H++ 2e → H2Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The reaction formula of the iodine oxidation H2SO3 is: I2+H2SO3+H2O→2I-+H2SO4+2H+Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The generated iodine consumption Through electrolysis, the current collected by the controller and the corresponding milligrams of sulfur calculated. The total sulfur content (%) in the coal can be calculated by dividing the milligrams of sulfur contained in the coal sample by the weight (mg) of the coal sample. Hr1Textile Testing Instruments, Testing Equipment Manufacturer


Principle of the methodHr1Textile Testing Instruments, Testing Equipment Manufacturer


According to the principle of coulometric titration, the coal sample is put into the purified air stream under the high temperature condition 1150 ℃ and the effect of the catalyst. During combustion, all forms of sulfur are burned into charcoal, and into SO2 and a littleAmount S decomposesO3 gas;Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The cleaned air stream is fed into the electrolytic cell to produce H2SO3 or a small amount of H2SO4. H2SO3 is immediately oxidized to H2SO4 by I2 (Br2) in the electrolyte. The result is: The I2(Br2) of the system decreases while the I(Br) increases;Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The equilibrium state of the electrolyte is destroyed, the potential between the indicating electrodes increases, the instrument automatically judges the start of electrolysis and controls the magnitude and time of the corresponding electrolyte current, so that the I2 (Br2) generated at the electrolytic electrode is equal to the amount consumed by the H2SO3 reaction, so that the electrolyte rebalances status and repeats the process until the end of the test. Hr1Textile Testing Instruments, Testing Equipment Manufacturer


The instrument calculates the total sulfur content in the sample according to Faraday's law of electrolysis based on the integration of the Str consumed by the electrolysis to produce I2 (Br2).Oms. Hr1Textile Testing Instruments, Testing Equipment Manufacturer

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