Discussion on the fuel for industrial boilers
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What are the differences between fuel used in industrial boilers, such as oil, kerosene, and natural gas? The main differences lie in the design of the boilers and their operating procedures. Please share your opinions.
These three types of fuel have different calorific values; during operation, a misting medium is slightly necessary, but it is not required for burning gas. Moreover, there is generally no shortage of kerosene.
The excess air coefficient for gaseous fuels is generally lower than that for liquids
Fuel generally needs to be atomized using steam or other gases, but gas does not. Boilers can be designed as positive-pressure or negative-pressure boilers. In positive-pressure boilers, a blower is used to introduce combustion air; the flue gas passes through the combustion chamber and then, after having its residual heat recovered, enters the chimney. The pressure inside the furnace and the oxygen content in the flue gas are typically controlled by baffles that direct air into the furnace as well as dampers on the blower. Negative-pressure furnaces generally use exhaust fans and blowers in combination to control the negative pressure inside the furnace; some burners are self-priming and therefore do not require a blower. Whether it is a positive-pressure furnace or a negative-pressure furnace, the oxygen content in the flue gas must be controlled. Thereby saving fuel gas or oil. Many small systems use variable-frequency motors to drive the exhaust fans, while large systems generally employ steam turbines for driving these fans in order to save energy; this allows the negative pressure in the furnace to be controlled based on the speed of the exhaust fans. If a variable-frequency motor is not used to drive the exhaust fan, a baffle can be installed at the inlet of the exhaust fan to control the negative pressure in the furnace.
Kerosene is generally used to start coal-fired boilers, but it is not used on a regular basis.
In accordance with the requirements of environmental impact assessments, all boilers in the urban area currently use fuel or gas, as the exhaust emissions from these types of boilers meet the specified standards.
Industrial boilers generally use diesel and natural gas; kerosene is practically useless.