Characteristics of gaseous fuels such as natural gas, biogas, and town gas for gas-fired boilers
Characteristics of gaseous fuels such as natural gas, biogas, and town gas for gas-fired boilers include:
(1) Good Usability
– They readily mix with air during combustion, resulting in minimal flue gas losses and high boiler efficiency.
– The fuels contain low levels of sulfur and ash content, which prevents high-temperature coking and corrosion on heat transfer surfaces.
– High flue gas velocities allow for a compact boiler design with lower metal consumption.
(2) Flexible Operational Adjustability
– The calorific value of gases is easily adjustable, enabling the blending and use of two different fuels.
– A single boiler can be adapted to run on multiple fuel types.
– Gas-fired boilers have strong adaptability to fluctuations in heat load, making it easy to implement combustion adjustments.
(3) Lower Environmental Impact
– Direct use without preprocessing; operating environments tend to be quieter.
– Ash and sulfur contents are significantly lower than those found in coal and oil-based fuels, reducing the need to handle large quantities of ash residue.
– Gaseous fuels do not generate the same level of solid waste as coal combustion.
– Minimal soil pollution; flue gases contain low dust levels, thus causing less atmospheric pollution.
– The primary pollutants are nitrogen oxides produced during combustion.
(4) Convenience in Transportation and Use
– Mainly transported through pipelines, eliminating spillage, noise pollution, and other issues associated with vehicular transportation.
– Direct usage is possible without the necessity for pre-processing steps like pulverization required before burning coal.