What is a low NOx burner on a water heater?
An Ultra Low NOx gas water heater is one that emits a lower level of nitrogen oxide than a standard gas water heater. Some states and municipalities have requirements and standards to limit the maximum amount of NOx emissions for gas water heaters – particularly certain counties in California and in the state of Utah.
How do I reduce NOx emissions in my boiler?
Water or steam injection can be utilized to reduce NOx levels. By injecting water or steam into the flame, flame temperatures are reduced, thereby lowering thermal NOx formation and overall NOx levels.
Why is low NOx burner necessary?
Low NOx burners are designed to control fuel and air mixing at each burner in order to create larger and more branched flames. Peak flame temperature is thereby reduced, and results in less NOx formation. A reducing atmosphere follows where hydrocarbons are formed which react with the already formed NOx.
What is considered a low NOx burner?
Low NOx burner or “LNB” shall mean a burner that is designed to achieve a NOx emission rate of less than or equal to 0.040 lb NOx/mmBTU (HHV) when firing natural gas at 3% stack oxygen at full design load without air preheat, even if upon installation actual emissions exceed 0.040 lb NOx/mmBTU (HHV).
How do you reduce NOx in a burner?
Utilize Flue-Gas Recirculation for Lowering NOX Emissions Flue-gas recirculation (FGR) commonly is used to control thermal NOX. It does this by reducing the burner flame temperature and staging the combustion of air and fuel.
What makes a furnace low NOx?
In referring to furnaces, NOx is a quick term to refer to both nitrogen oxide and nitrogen dioxide. So, a low NOx furnace is one that has a reduced quantity of nitrogen oxide & nitrogen dioxide emissions.
What is a NOx water heater?
Ultra-low NOx water heaters In certain parts of California, any new water heater installed in a home must be an ultra-low NOx model. NOx stands for nitrogen oxides, which are gases that are released by machines that burn natural gas, including tank water heaters.
What is the difference between low NOx and ultra low NOx?
Difference between Low NOx and UltraLow NOx When it comes to Low NOx, it can reduce the emission of NOx to 30 pm. Low NOx equipment uses FGR and is able to maintain 3 to 5% excess oxygen with strong controls. The turndowns are less than the ratio of 8:1. For UltraLow NOx, the emissions are between 7 to 15 ppm.
What is low NOx vs Ultra low NOx?
Where are ultra low NOx water heaters required?
California
Low NOx commercial water heaters are required in Texas and ultra low NOx water heaters are required in most of California.
What causes high NOx in a boiler?
NOx emissions from boilers are influenced by many factors. The most significant factors are flame temperature the amount of nitrogen in the fuel, excess air level and combustion air temperature. Also, a longer residence time at high temperatures results in higher NOx.
What causes high NOx?
Engine Overheating – Inadequate engine cooling can will high NOx. If your vehicle’s cooling system is not working efficiently, (i.e. bad radiator, thermostat, hoses) high NOx will be created. Remember high NOx nitric oxide is created when an engine’s combustion chamber temperatures reach over 2500F.