Method and system for pyrolysis

A system for pyrolysis of a pyrolyzable organic feed which produces a carbonaceous pyrolysis product, the system comprising:

• (i) a gas producer comprising a gasification zone and a producer gas outlet, wherein the gas producer is configured to:
• oxidise at least one carbon-containing feed in the presence of an oxidising gas in the gasification zone to form a producer gas;
• and
• discharge the producer gas from the gasification zone via the producer gas outlet,
• wherein a residual oxygen content of the producer gas is substantially depleted or maintained below a maximum predetermined amount by controlling a ratio of oxygen fed to the gasification zone to the carbon-containing feed,
• (ii) a pyrolyzer comprising a pyrolysis zone and one or more pyrolyzer gas outlets, wherein the pyrolyzer is configured to:
• feed the producer gas discharged from the gasification zone to the pyrolysis zone;
• pyrolyze a pyrolyzable organic feed in the pyrolysis zone by fluidizing the pyrolyzable organic feed in a flow of the producer gas to produce a carbonaceous pyrolysis product and a gas mixture comprising combustible components wherein the pyrolyzable organic feed and the carbonaceous pyrolysis product are fluidized in the pyrolysis zone for a residence time of at least 10 minutes;
• and
• discharge the gas mixture from the pyrolysis zone via the one or more pyrolyzer gas outlets, and
• (iii) a first combustor comprising a combustion zone, wherein the first combustor is configured to:
• receive the gas mixture discharged from the pyrolysis zone in the combustion zone;
• feed an oxygen-containing gas to the combustion zone;
• and
• combust at least a portion of the combustible components present in the gas mixture in the combustion zone to produce a combustion product gas,
• wherein the system is configured to discharge at least a portion of the carbonaceous pyrolysis product from the pyrolyzer as an unoxidized product from the system, wherein the discharged carbonaceous pyrolysis product is not oxidised in either the first combustor or the gas producer;
• wherein the combustible components in the gas mixture discharged from the pyrolysis zone and received in the combustion zone comprise both a non-condensable gas fraction of the pyrolysis gas and a vaporised condensable oil fraction of the pyrolysis gas, and
• wherein the system is configured to (i) combust the combustible components with excess oxygen in the first combustor or (ii) to partially combust the combustible components in the first combustor and to combust residual combustible components in the combustion product gas with excess oxygen in a further combustor.