Does the gas burner increase the gas cost? Experience shows that when the flue gas recirculation rate is 10-15%, the NOx emission concentration of the gas burner can be reduced by more than 40%. The flue gas recirculation rate of gas boilers is generally controlled at 10-20%. When a higher flue gas recirculation rate is used, the combustion will be unstable and the heat loss of incomplete combustion will increase.
There are two ways for flue gas circulation to participate in reburning: internal flue gas circulation and flue gas external recirculation.
The internal circulation of flue gas is generally used for ordinary low-nitrogen applications. The flow rate of the burner nozzle is used to generate the effect of smoking gas, so that a small amount of flue gas can participate in the combustion again, reducing the flame temperature, and the emission target value is below 80 mg/m3;
The external recirculation of flue gas is to greatly increase the flow of recirculated flue gas through the mechanical force of the fan, and the amount of recirculated flue gas can account for 15-10% of the total flue gas volume, which greatly reduces the flame temperature and lowers nitrogen oxidation. The target value is less than 30mg/m3
Gas burner flue gas recirculation combustion technology
The flue gas recirculation technology is a technology to reduce nitrogen oxides by reintroducing part of the boiler exhaust gas into the furnace and mixing it with natural gas and air for combustion.
Using flue gas recirculation technology, the combustion temperature in the core area of the boiler is reduced, and the excess air coefficient remains unchanged. Without reducing the efficiency of the boiler, the generation of nitrogen oxides is suppressed, and the goal of reducing nitrogen oxide emissions is achieved.
10%-25% of the exhaust gas of the gas burner is bowed back from the boiler exhaust main pipe to the front of the boiler through the FGR flue pipe, and the flue gas volume is adjusted through the adjusting damper on the FGR flue pipe; the combustion air enters the frequency conversion after passing through the fresh air filter The blower is boosted by the blower to the front end of the boiler; the fuel gas passes through the double shut-off valve valve group and the servo regulating valve to the front end of the boiler; the boiler exhaust gas and combustion-supporting air are mixed after passing through the mixer, and the fuel gas is sprayed out through a specially designed nozzle , To form a stable flame in the boiler
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