System to Lower Emissions and Improve Energy Efficiency on Fossil Fuels and Bio-Fuels Combustion Systems
Inactive Publication Date: 2012-04-12
ELDABBAGH FADI +1
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Benefits of technology
[0007]According to one aspect of the present invention there is provided a water heater system comprising: a hot water boiler having top, bottom and side walls; a flue connected to the top wall; a burner secured to a side wall of the first housing; a combustible feeder connected to the burner; an evaporator having a housing comprising an outlet, heat exchange elements located in the housing and a water discharge device spaced above the heat exchange elements, wherein the evaporator provides a source of humid air to the burner for increasing the combustion products dew point and to reduce NOx emissions when burned; and a heat recovery system connected to the flue wherein the heat is used for heating water used by the water discharge device.
Problems solved by technology
In the state of the art, such systems are limited to natural gas burners, because of the high water content of the flue gases.
Coal, however, produces flue gases with much less water than natural gas, and the resulting dew point is too low to use the steam pump design.
Method used
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Embodiment Construction
[0013]The invention relates to a water heater system in which hot water from a heat recovery system is used to warm and humidify a flow of intake air to the burner. The objectives are to reduce energy consumption and to reduce flame temperature so thermal and fuel NOx's will be reduced. An advantage of the present invention is that the amount of water and the temperature of the air are closed loop controlled to the maximum level before negative effects appear.
[0014]The following parameters play a role: condensation of water in the air piping, with presence of water droplets in the air; reduction of the O2 availability to sustain the combustion; and presence of combustion residues like soot.
[0015]The major source of NOx production from nitrogen-bearing fuels such, as certain coals and oil, is the conversion of fuel bound nitrogen to NOx during combustion. During combustion, the nitrogen bound in the fuel is released as a free radical, and ultimately forms free N2, or NO. Fuel NOx can...
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The present invention relates to a water heater system comprising: a hot water boiler having top, bottom and side walls; a flue connected to the top wall; a burner secured to a side wall of the first housing; a combustible feeder connected to the burner; an evaporator having a housing, the housing comprising an outlet, heat exchange elements located in the housing and a water discharge device spaced above the heat exchange elements, wherein the evaporator provides a source of humid air to the burner for increasing the combustion product dew point and to reduce NOx emission when burned; and a heat recovery system connected to the flue wherein the heat is used for heating water used by the water discharge device.
Description
FIELD OF THE INVENTION[0001]The present invention concerns a water heater system wherein the amount of water and the temperature of the air are closed loop controlled for reducing NOx production.BACKGROUND OF THE INVENTION[0002]In view of the rise in energy price, coal has become a cheap energy source in comparison to oil or natural gas. In hot water boilers, coal has been largely replaced by natural gas, electricity and oil as alternative fuel source, in part because coal is a heavy pollutant. However, because they are economical, the demand for hot water systems using coal burners has increased. Coal is economical, but generates amongst other things NOx, which are responsible for environmental problems like smog, acid rain, etc.[0003]It is well known that by humidifying the intake air of a natural gas burner, significant energy savings and NOx reduction can be achieved. However, to remain economical, such air humidifying systems are based on the Steam Pump principle, where energy ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F24H1/00
CPCF23D14/68F23L7/005F23L15/04Y02B30/14F24D12/02F24D2200/18F24H9/2035F23N5/003Y02B30/00Y02E20/34
Inventor ELDABBAGH, FADIMANDEVILLE, LUC
Owner ELDABBAGH FADI