How much are Hetian gas boilers?

Recently, a customer reached out to us inquiring about the operation process of a gas boiler. In response to this question, our technical staff provided an explanation.

1. Heating and Drying Phase

After coal enters the furnace and is heated, the moisture in the coal begins to vaporize and evaporate. When the gas boiler temperature reaches 100-105°C on the same day, the moisture has completely evaporated, and the coal is fully dried. The duration of the heating stage varies depending on the amount of moisture in the coal; the more moisture, the longer the drying stage.

2. Formation of coke from volatilized matter逸出挥发物形成焦炭阶段

As temperatures continue to rise, the dry coal begins to decompose, releasing combustible gases known as volatiles. After the volatiles are released from the natural gas boiler, the remaining solid material is called coke, which, aside from ash, is almost entirely carbon. Sometimes, there is also a small amount of sulfur, and this portion of carbon and sulfur is sometimes referred to as fixed carbon.

3. Volatile fraction ignition stage

On the day, when the volatile substances from the gas boiler mix with the air to reach a certain concentration, the volatiles ignite and burn, releasing a large amount of heat and heating the coke, creating conditions for the combustion of the coke.

4. Ash and slag formation stage from coke combustion

As the volatiles approach complete combustion, coke begins to burn, which is a chemical reaction between solid fuel and oxygen in the air. The combustion of coke is slow and takes a long time to burn out, accounting for about 90% of the total combustion time. When the outer shell of the coke burns off and forms ash that hinders oxygen from diffusing into the core of the coke, combustion will cease, resulting in slag.

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 boiler and gas bathing boiler. Gas boilers, as the name implies, refer to boilers that use gas as fuel. Compared to oil-fired and electric boilers, gas boilers are the most economical. Therefore, most people choose gas boilers as equipment for steam, heating, and bathing.

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 gas heating boilers and gas 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" define 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 Distribution System

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

Fan impeller, air gun nozzle, damper controller, damper blade, 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 Zhuoyi Energy-Saving for gas boilers. It's convenient and time-saving, requiring only a finger press to ignite, and offers high safety, preventing accidents caused by accidental extinguishing. In case of flameout, the control system can promptly close the solenoid valve to cut 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 figure).

4. Fuel System

The function of the fuel system is to ensure the fuel required for the burner's combustion. The main components of the fuel system for oil burners include: fuel lines and connectors, fuel pumps, solenoid valves, nozzles, and heavy oil preheaters. For gas burners, the main components are: filters, regulators, solenoid valve arrays, ignition solenoid arrays, and fuel butterfly valves.

5. Electric Control System

The electrical control system serves as the command and coordination center for the aforementioned systems, primarily controlled by programmable controllers. Different programmable controllers are available for various burners, with common types including the LFL series, LAL series, LOA series, and LGB series. The main difference lies in the varying time intervals of the program steps.