METHOD AND PLANT FOR PRODUCTION OF A FUEL GAS FROM WASTE

摘要

A method and plant for thermal treatment and chemical transformation of waste comprising natural and synthetic carbonaceous materials for generation of a fuel gas for further use is described. Pyrolysis gas and solid waste from a thermolysis and pyrolysis reactor (40), is further processed to produce a fuel gas having a substantially stable WOBBE index.

主权项

1. A method for thermal treatment and chemical transformation of waste comprising natural and synthetic carbonaceous materials for generation of a fuel gas for further use, the method comprising the following steps:
a. adjusting the humidity of the carbonaceous materials to a predetermined level by drying or introduction of water or steam into the carbonaceous material, b. introduction of the humidified carbonaceous material into thermolysis and pyrolysis reactor(s), in which the materials are thermally treated to produce a raw pyrolysis and thermolysis gas and a carbonaceous solid rest, c. introduction of the carbonaceous solid rest from step b) and steam into a conversion unit to cause partial gasification of solid carbonaceous material therein to produce a synthesis gas comprising hydrogen, CO and CO2 that is withdrawn and introduced into a second scrubbing section and a solid rest that is withdrawn for further treatment or disposal, d. introducing the raw thermolysis and pyrolysis gas from step b) into a first gas cleaning unit where the gas is separated into a first light oil fraction having a boiling range from 170 to 350° C. at atmospheric pressure, and a scrubbed raw gas fraction mainly comprising H, CO, CO2 and hydrocarbons having a boiling range below 170° C., e. introducing the scrubbed raw gas fraction into a first gas separation unit where the raw gas is separated into a hydrogen enriched gas fraction and a and a low hydrogen fraction, f. introduction of the low hydrogen fraction into the conversion unit to be converted together with the solids therein, g. introducing the hydrogen enriched fraction into the second separation unit, wherein the hydrogen enriched fraction and the synthesis gas of step c) are separated in a second light oils fraction, having a boiling range of 100 to 200° C. at atmospheric pressure, and a synthesis gas fraction that is withdrawn through a synthesis gas line wherein the method further comprises h. recycling of the first light oils fraction from step d) into the thermolysis and pyrolysis reactor(s).