Gas boilers include gas water boilers, gas hot water boilers, and gas steam boilers, among which the gas hot water boiler is also known as gas heating and gas bathing boilers. As the name implies, gas boilers refer to boilers that use gas as fuel. Compared to oil boilers and electric boilers, gas boilers are the most economical choice, so most people opt for gas boilers as steam, heating, and bathing equipment.

Gas boilers include models such as the KS-Q Gas Water Boiler, CLHS (CWNS) Gas Hot Water Boiler, and LHS (WNS) Gas Steam Boiler. Among them, gas hot water boilers encompass both heating and bathing boilers. With the completion of the national "West Gas to East" project, gas boilers have gradually become the top choice for many.

The "Special Equipment Safety Supervision Regulations" defines boilers as equipment that utilizes various fuels, electricity, or other energy sources to heat the contained liquid to certain parameters and output thermal energy. The scope includes pressure steam boilers with a volume of 30L or more; pressure hot water boilers with an outlet water pressure of 0.1MPa or more (gauge pressure) and a rated power of 0.1Mw or more; and organic heat carrier boilers. [1]

Burner

The construction of the gas burner consists of the following 5 systems:

1. Air Supply System

The function of the air supply system is to deliver air of a certain wind speed and volume into the combustion chamber, its main components include: the housing, fan motor,

Fan blades, air gun fire tube, air door controller, air door dampers, cam adjustment mechanism, diffuser disk.

2. Ignition System

The function of the ignition system is to ignite the mixture of air and fuel, with main components including: ignition transformer, ignition electrode, and high-voltage ignition cable. A safer type of ignition system is the electronic pulse igniter, widely used by manufacturers like Zuyi Energy-saving Gas Boilers. It is convenient and time-saving, requiring only a finger press, and offers high safety, preventing accidents caused by accidental extinguishing. In case of a flame-out, the control system can promptly close the solenoid valve and shut off the gas supply.

3. Monitoring System

The function of the monitoring system is to ensure the safe and stable operation of the burner, with main components including flame sensors, pressure sensors, and temperature sensors (as shown in the following diagram).

 

4. Fuel System

The function of the fuel system is to ensure the fuel required for the burner's combustion. The fuel system of an oil-burning burner mainly consists of: fuel pipes and fittings, fuel pumps, solenoid valves, nozzles, heavy oil preheaters. For gas burners, the main components include: filters, regulators, solenoid valve groups, ignition solenoid valve groups, and fuel butterfly valves.

5. Electric Control System

The electrical control system serves as the command and coordination center for the aforementioned systems. The main control components are programmable controllers, which vary depending on the type of burner. Common programmable controllers include the LFL series, LAL series, LOA series, and LGB series. The primary distinction lies in the different timing of each program step.

Steps and Standards for Water Quality Testing of Gas Boilers

1. Determination of Chloride Content

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

Determination of Alkalinity

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

Measurement of 3 hardness

Pipette 100ml of boiler water into a 250ml conical flask, add a few grains of Lohmann 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, and record 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 per liter for steam ovens

Water heater 0.6 mmol per liter

Determination of pH Level

Measure with pH test strips

Standard: pH: 10-12

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