Energy-saving effect of gas boilers is significantly better than that of other types. Gas boilers account for a high proportion in developed countries like Europe and the US. In China, due to historical reasons, coal-fired boilers dominate the market. With the severe air pollution in recent years, especially in the Beijing-Tianjin-Hebei region, as well as Shandong, Shanxi, and Henan, winter smog is extremely severe, severely affecting people's health. As public awareness grows, the understanding of smog deepens, and the Blue Sky Defense Project is underway with great momentum. The "coal-to-gas" project is a powerful weapon in this effort.

Steps and Standards for Water Quality Testing of Gas-Fired Boilers

Determination of Chloride Ion Content

Pipette 100ml of boiler water into a 250ml conical flask, add 2-3 drops of phenolphthalein indicator, which should turn pink. Then titrate with sulfuric acid until colorless. Add 2-3 drops of potassium ferricyanide indicator, and titrate with a standard silver nitrate solution until a date-red color is obtained. Record the volume of silver nitrate used, multiply by 35.5 to obtain the standard for chloride ions: chloride ions ≤ 400.

Determination of pH Level

Pipette 100ml of boiler water into a 250ml conical flask, add 2-3 drops of phenolphthalein indicator, the solution turns pink. Titrate with the standard sulfuric acid solution until the color just disappears, then add 2-3 drops of methyl orange indicator, continue titrating with sulfuric acid until the solution turns orange-red, record the volume of sulfuric acid consumed; this volume is equivalent to the alkalinity value.

Measurement of 3 Hardness

Pipet 100ml of boiler water into a 250ml conical flask, add a few grains of Loheng T indicator, then add 2-3 drops of ammonia-ammonium chloride buffer solution. Titrate with EDTA standard solution until the solution changes from wine red to blue, recording the volume of EDTA solution consumed. This volume is equivalent to the hardness value of the boiler water.

Standard: Hardness: less than or equal to 0.03 mmol/L for steam ovens

Water heater: 0.6 mmol per liter

pH Measurement

Determine using pH test strips

Standard: pH Level: 10-12

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