Taking a certain gas-fired heater as the research object

synergistic rules of NO

x

and CO

2

production under different proportions of biomass gas co-firing were studied. Results show that compared with pure gas combustion

co-firing biomass gas can reduce furnace flame center

peak temperature of furnace flue gas and outlet flue gas temperature of the convection chamber. When the co-firing ratio is 10%

the volume fraction of carbon d

ecreases by 25.3%

and the volume fraction of NO

x

at the outlet is reduced by 67.1%. When the co-firing ratio exceeds 10%

the outlet NO

x

production decreases slowly. When the co-firing ratio is 5%-10%

the CO

2

and NO

x

production shows a positive synergistic trend

while when the co-firing ratio is within the range of 15% to 30%

the generation amounts of CO

2

and NO

x

show a negative synergistic trend. Therefore

to synergistically reduce the generation amounts of CO

2

and NO

x

the optimal co-firing ratio is 10%. At this ratio

the furnace outlet volume fraction of CO

2

is the lowest(2.30%)

and the volume fraction of NO

x

emissions is 49.810

-6

.