Activated coke(AC)is known as an effective adsorbent for SOxand air toxic materials in flue gas treatment.The bed resistance is an important factor influencing the performance of the AC fixed bed.In this paper

we deduced the theoretical formula for calculating the bed resistance using a simplified packing model.Furthermore

a fixed AC bed system was built to solve the formula.The bed resistances of two types of active cokes(AC-5

AC-9)were tested in the flow of air.Thus

the empirical formulas were obtained by means of linear fitting

that isΔp/uL=3 742u+704

Δp/uL=2 212u+303

for AC-5and AC-9separately.The feasibility and reliability of the formulas were verified

with most of errors lower than 3%.It is worth mentioning that both of the formulas should be corrected according to practice.