The flow rate and atomization characteristics of sprayer have obvious influence on denitrification efficiency of the selective non-catalytic reduction(SNCR) system. The main factors influencing the flow rate and atomization characteristics of the SNCR internal-mixing sprayer

such as the liquid pressure

gas pressure and gasliquid ratio

were studied

especially the influence on the spray distance. The results show that

the liquid flow characteristic curve conforms to the exponential relationship of Q_w≈(p_w-p_3)0.5. The optimal design pressure of the gas in the sprayer is p_w≤p_a≤p_w+0.1 MPa. The atomized particle size got larger with the liquid pressure

and the spray range grew obviously. With an increase in the gas-liquid ratio

the atomized particle size got smaller

and the spray range shrinked. Considering the stiffness spray range problem

the gas-liquid ratio should be selected as 0.10. Moreover

a design gas-liquid ratio of less than 0.10(k ALR≤0.10) can significantly enlarge the spray range. Increasing the initial pressure of gas and liquid can not improve the spray distance significantly