Gas boiler structure:

   Hegu gas boilers are currently mainly available in the following types:WNSSeriesSZSSeries.WNSThe series of boilers is primarily composed of the boiler shell and the furnace body, featuring a second and third return螺纹烟管 heating surface design, also known as horizontal three-return boilers. What is meant by that is...“Wet back style” Boilers refer to the transition chamber of the boiler being moved into the internal drum, where the transition chamber's tube plate, back plate, and cylinder are all surrounded by boiler water.(Immersed in furnace water)Therefore, it is referred to as“Wet-back style”(Also known as water-backed style)。
   CurrentlyWNSThe series of regenerative chambers are all submerged in water, and they are all wet-back boilers. The dry-back boilers, however, do not have a fully water-enclosed smoke chamber. The Hekou gas boilers use wet-back structures. Additionally, to ensure the safe and economic operation of the boiler, auxiliary instruments, automatic control, and protection systems are also added.

    SZSThe series of boilers belong to the double-drum longitudinal firebox type, which are water-cooled wall boilers with upper and lower drums. Between the drum and the lower header, there are downcomers and water-cooled wall tubes, forming the framework of the combustion chamber.

Steps and Standards for Water Quality Testing of Gas Boilers

Determination of Chloride Ion Content

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

Determination of Alkalinity

Measure 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 just colorless, then add 2-3 drops of methyl orange indicator, continue titrating with sulfuric acid until orange-red, record the volume of sulfuric acid consumed; this value is equivalent to the alkalinity.

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. Record the volume of EDTA solution consumed. This value is equivalent to the boiler water hardness.

Standard: Hardness: Steam boiler ≤ 0.03 mmol/L

Hot water boiler: 0.6 mmol per liter

pH Measurement

Use pH test strips to measure

Standard: pH Value: 10-12

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