To provide a method for reducing the amount of sulfur compounds contained in the gas that are produced when coke is burnt by air existed in a pre-chamber of coke dry quenching equipment. This method comprises the step of throwing lime into the coke dry quenching equipment(101), wherein the lime(181a) is thrown into a pre-chamber(105) into which red-hot coke(151) is also thrown, wherein the lime(181b) is positioned in a bucket and/or bucket truck(102) for moving and throwing the red-hot coke into the coke dry quenching equipment, wherein gas in a partial or all space inside the pre-chamber of the coke dry quenching equipment has a temperature of 1,000 to 1,100 deg.C, wherein 10 wt.% of lime has a grain size of less than 10 mm, wherein an amount of the lime thrown into the pre-chamber is 25to 640 g/ton of coke, wherein the lime is thrown into the pre-chamber between intermittent throwing operations of the red-hot coke, or thrown into the pre-chamber along with the red-hot coke at the same time, wherein the lime is thrown into the pre-chamber through a coke feeding opening(104) positioned on an upper part of the coke dry quenching equipment or one or more of lime feeding openings(185) positioned on the pre-chamber, wherein the lime is thrown into the pre-chamber by a carrier gas of nitrogen gas and/or circulation gas(107), and wherein the lime is thrown into the bucket and/or bucket truck before, when and/or after the red-hot coke is loaded on the bucket and/or bucket truck.