NOVELTY - A system for thermal cracking of hydrocarbons comprising mass, comprises first cracking device for thermal separation of a mass comprising hydrocarbons in gaseous fraction, a distillation device connected with discharge of first cracking device, second cracking device connected with discharge of first cracking device for thermal separation of charred product flow, first gasification device connected with discharge of second cracking device for gasification of part of heavy liquid fraction, and second gasification device for gasification of a part of rest fraction.    USE - As system for thermal cracking of a hydrocarbons comprising mass (claimed), for producing different products from biomass, waste and other combustible materials; as a fuel or as a feedstock for chemical processes e.g. methanol production, and as a fuel for boilers or transportation.    ADVANTAGE - The system provides relatively efficient system. With the process the quality and quantity of the produced liquid products can be controlled and varied for the production of products in different qualities and quantities, and the synthesis gas produced, contains practically no tar. Thus avoiding clogging problems.    DETAILED DESCRIPTION - A system for the thermal cracking of a hydrocarbons comprising mass, comprises a first cracking device for the thermal separation of a mass comprising hydrocarbons in at least a gaseous fraction and a charred product flow, where the first cracking device comprises first heating unit for heating the mass, a distillation device connected with the discharge of the cracking device for the separation of a gaseous fraction originating from the cracking device in at least a heavy liquid fraction and at least a light fraction, where at least one discharge of the distillation device is connected with the inlet of the cracking device for leading back at least a part of the heavy liquid fraction from the distillation device to the cracking device, where the distillation device comprises at least one discharge for discharging the light fraction, a second cracking device connected with the discharge of the first cracking device for the thermal separation of the charred product flow originating from the first cracking device in at least a heavy liquid fraction and a rest fraction, where the second cracking device comprises second heating unit for heating the charred product flow, a first gasification device connected with the discharge of the second cracking device for the gasification of at least a part of the heavy liquid fraction originating from the separation device to a first gas fraction, where the first gasification device comprises third heating unit, a second gasification device connected with the discharge of the first gasification device for the gasification of at least a part of the rest fraction formed in the second cracking device to a second gas fraction, using the first gas fraction, where the second gasification device is provided with a discharge for discharging at least a part of the first gas fraction and at least a part of the second gas fraction. An INDEPENDENT CLAIM is included for method for the thermal cracking of a mass comprising hydrocarbons, in particular using a system, involving leading a mass comprising hydrocarbons in the first cracking device, separating the mass in at least gaseous fraction and a charred product flow by means of heating of the mass in the cracking device, leading at least a part of the gaseous fraction to a distillation device, separating by means of distillation of the gaseous fraction in the distillation device in at least a heavy liquid fraction and at least a light fraction, removing from the distillation device at least a part of the light fraction, leading back from the distillation device to the first cracking device of at least a part of the heavy liquid fraction, leading the charred product flow to the second cracking device, separating in the second cracking device, the charred product flow in at least a heavy liquid fraction and a rest fraction by means of heating of the charred product flow, leading at least a part of the heavy liquid fraction to the first gasification device, converting at least a part of the heavy liquid fraction in a gas fraction by means of heating of the heavy liquid fraction, leading at least a part of the first gas fraction to the second gasification device, heating the rest fraction in the second gasification device by bringing the rest fraction in contact with at least a part of the first gas fraction, where at least a part of the rest fraction will be converted in a second gas fraction, and discharging at least a part of the first gas fraction and at least a part of the second gas fraction.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view of a system for thermal cracking of a hydrocarbons comprising mass.