US4659305A - Flue gas recirculation system for fire tube boilers and b…
Boiler shall be factory-fabricated, factory-assembled and factory-tested, fire-tube condensing boiler with heat exchanger sealed pressure-tight, built on a steel base, including insulated jacket, flue-gas vent connections, combustion-air intake connections, water supply, dual inlet returns condensate drain connections, and controls.
Modeling of fire-tube boilers - Archive ouverte HAL
Jun 15, 1994 · Normal operating temperature in the combustion zone is approximately 2,000 - 3,000 degF. The boiler produces 4,500,000 lb/hr of steam for a General Electric steam turbine generator rated at 688 MWe. Figure 2-1 is a diagram of the process. Combustion air is supplied from two sources, the primary and secondary air systems.
In this work, the modeling of the heat transfer between flue gas and water in a fire-tube boiler is considered. In the literature, a comprehensive modeling for fire-tube boilers has not been treated. Generally, the few models found are focused to one aspect of the fire-tube boiler performance as the gas/fire side or the water/steam side, and
Difference Between Fire Tube Boiler and Water Tube Boiler [With PDF]
Plant Engineering | When to use electric steam boilers
This paper presents the design of a laboratory fire-tube steam boiler for eventual construction and use as a teaching aid and for research purposes. Thermodynamics, heat transfer and strength of materials analysis were conducted to estimate
A flue gas recirculation system for fire tube boilers includes a duct connected to the boiler gas discharge stack and to a fan. Another duct couples the fan to a specially designed burner in the boiler. Recirculated flue gas is injected downstream of the fuel/air mixture in the burner and cools the flame leading to substantially reduce the NO x content in the boiler stack emissions.
Steam boilers are used to generate steam. Steam boiler equipment typically has fuel/flue gas and water/steam sections. Based on the flow of flue gases and water/steam, they are classified as water-tube boilers and fire-tube boilers. In water-tube boilers, the shell side contains the fuel and hot flue gases and water flows inside the tubes.