METHOD FOR PRODUCING ACETYLENE AND SYNTHESIS GAS

摘要

The invention relates to a method for producing acetylene and synthesis gas by partially oxidizing hydrocarbons by means of oxygen. In said method, a first input flow containing one or more hydrocarbons and a second input flow containing oxygen are preheated separately from each other, mixed at a ratio of the mass flow rate of the second input flow to the mass flow rate of the first input flow corresponding to an oxygen number lambda less than or equal to 0.31, and fed via a burner block to a combustion chamber. The hydrocarbons are partially oxidized in the combustion chamber. A cracked gas is thereby obtained, which is quenched to 80 to 90 degrees Celsius downstream of the combustion chamber by injecting an aqueous quenching medium. A process water flow Iliq and a product gas flow Ig are obtained. The product gas flow is cooled down in a cooling column by means of direct heat exchange with cooling water in order to obtain a process water flow IIliq as a bottom flow, a product gas flow IIg as a top flow, and a side flow, which is depleted of soot in an electric filter. A process water flow IIIliq arises in the electric filter. The process water flows Iliq, IIliq, and IIIliq are merged and conducted via soot grooves having surface particle separators in order to obtain a merged process water flow IVliq. The method is characterized in that the merged process water flow IVliq is subjected to cleaning by means of partial evaporation in a single-stage flash tank, the merged process water flow IVliq being evaporated to a fraction of 0.01 wt% to 10 wt%, in relation to the total weight thereof, in order to obtain a cleaned process water flow Vliq, which is recycled into the method.