Method for cleaning a large tank for a flammable liquid and device for it

摘要

In the method for cleaning a large tank, a volumetric flow of gas is extracted by suction from the gas chamber (34) of the large tank (20) and burned in a combustion chamber system (48). At least part of the exhaust gas thereby produced is returned by way of an exhaust-gas line (60, 62) into the gas chamber (34), in which a subatmospheric pressure is maintained. By way of a suction-extraction line (73), a mass flow of residual sump matter (30) is removed from the large tank (20) and fed to a heat exchanger (56), which is connected by way of a circuit (54) to a heating coil (52) of the combustion chamber system (48). The heated mass flow of residual sump matter (30) is directed into the large tank (20) under a high pressure of at least 20 bar onto a partial region of the mass of residual sump matter (30) that is in the large tank (20) through injection nozzles (24) that end in the gas chamber (34) and are directed onto the residual sump matter (30). When this happens, the mass of residual sump matter (30) that is in the large tank (20) is gradually moved, heated and agitated, thereby forming aerosols, which are a constituent of the gas in the gas chamber (34) and are extracted by suction as a volumetric flow by way of the gas line (32).