Fuel conditions can significantly impact combustion performance of all types of boilers. Fuel conditions include temperature, pressure and particle size. Cooler temperatures, lower pressure and larger particle size contribute to less complete combustion and increased unburned carbon in the ash.
on the boiler are required to facilitate natural gas firing. Typical pulverized coal combustion requires 20% excess air, while natural gas firing requires only 10%, resulting in less total combustion air and less flue gas flow for natural gas filing than for pulverized coal.
Boiler Efficiency - an overview | ScienceDirect Topics
Boiler Efficiency and Combustion | Spirax Sarco
Mar 18, 2019 · Meanwhile, Miura's EX series of boilers can run on natural gas, propane, of #2 fuel oil, giving you several fuel options. One of the top benefits of a boiler that can run on multiple types of fuel is that it can help you to make adjustments to changing fuel costs. Prices can fluctuate so much that it's sometimes difficult to commit to one type of fuel all the time. When it comes to fuel for your boiler, it's …
The fuel savings as can be seen from the figure can be substantial depending on the boiler operating time. As expected the longer the boiler stands-by the larger are the fuel savings. Thus a boiler operating for 12 hours, firing typically for about one-third of a cycle has a fuel saving of 5.5% compared to 1.7% for 24 hours operation.
Fuel-rich mixtures - The danger of a fuel-rich mixture is that high concentrations of unburned fuel can build up. When this unburned fuel ignites, it can do so in a very rapid or explosive manner. Fuel-rich mixtures can occur any time that insufficient air is supplied for the amount of fuel being burned. Never add air to a dark smoky furnace.
Boiler Operations That Affect Efficiency (Part 2)
Fuel Reburning. Fuel reburning involves diverting 10–20% of a boiler's fuel input to create a secondary combustion zone downstream of the primary zone. In the secondary or reburn zone, NOx from the primary zone is reduced to elemental N 2. Additional air is …