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A process for gasification of solid feed material to produce a syngas includes: providing a plasma heated carbonaceous bed in a bottom section of a reactor vessel; forming a bed of deposited feed material on top of the carbonaceous bed; reacting the feed material with hot gases rising from the botto

A process for gasification of solid feed material to produce a syngas includes: providing a plasma heated carbonaceous bed in a bottom section of a reactor vessel; forming a bed of deposited feed material on top of the carbonaceous bed; reacting the feed material with hot gases rising from the bottom section; forming, in a middle section of the reactor vessel, a syngas mixture containing a varying quantity of unreacted particles of the feed material; allowing the syngas mixture to rise into a top section of the reactor vessel; and at least partially quenching, by injecting a quench fluid including water, steam, or a mixture thereof, in a second, upper part of the top section, at least some of the unreacted particles sufficiently to reduce the number of unreacted particles exiting the reactor vessel that are likely to be deposited on walls of external ductwork.

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1. A process for gasification of solid feed material to produce a syngas comprising: providing a plasma heated carbonaceous bed in a bottom section of a reactor vessel;feeding feed material into the reactor vessel to form a bed of deposited feed material on top of the carbonaceous bed in the bottom

1. A process for gasification of solid feed material to produce a syngas comprising: providing a plasma heated carbonaceous bed in a bottom section of a reactor vessel;feeding feed material into the reactor vessel to form a bed of deposited feed material on top of the carbonaceous bed in the bottom section;reacting the feed material with hot gases rising from the bottom section;forming, in a middle section of the reactor vessel, a syngas mixture containing a varying quantity of unreacted particles of the feed material;allowing the syngas mixture to rise into a top section of the reactor vessel including a conical part toward one or more syngas outlets in a roof of the reactor vessel;maintaining conditions in the vessel such that unreacted particles from the middle section are subjected to further reactions in a first, lower, part of the top section; andat least partially quenching, by injecting a quench fluid including water, steam, or a mixture thereof, through a plurality of quench fluid inlets in the roof into a quench zone in a second, upper part of the top section, at least some of the unreacted particles sufficiently to reduce the number of unreacted particles exiting the reactor vessel that are likely to be deposited on walls of external ductwork, wherein the quench zone is located in a cylindrical part between the conical part of the top section and the roof. 2. The process of claim 1, wherein: the quenching step reduces the temperature of the unreacted particles by about 150° C. to 300° C. before the unreacted particles reach one or more outlets of the reactor vessel. 3. The process of claim 1, wherein: the quenching step reduces the temperature of the syngas mixture that enters the top section at about 1000° C. to 1150° C. down to about 850° C. 4. The process of claim 1, wherein: at least some of the unreacted particles are made sufficiently solid such that the unreacted particles are not subject to stick to walls of the external ductwork. 5. The process of claim 1, wherein: steam included in the quench fluid assists in cracking heavy hydrocarbons in the syngas mixture. 6. The process of claim 1, wherein: the quench fluid is injected downwardly through a plurality of nozzles in a roof of the reactor vessel. 7. The process of claim 6, wherein: the nozzles are positioned adjacent to the syngas outlet. 8. The process of claim 7, wherein: the nozzles are positioned symmetrically around the outlet in the reactor vessel. 9. The process of claim 1, wherein: the quench fluid is injected through a plurality of nozzles and flows of the quench fluid through the nozzles is not uniform. 10. The process of claim 1, further comprising: a gas temperature sensing and fluid flow adjustment system configured to increase the volume of the injected quench fluid when hotter gas is encountered near at least one of the nozzles. 11. The process of claim 1, wherein: the quench fluid aids in conversion of any polycyclic aromatic hydrocarbons (PAHs) rising from the freeboard region into the quench zone to CO, CO2, H2 and/or H2O. 12. The process of claim 1, wherein: the steam serves as a motive gas to atomize water in the quench fluid. 13. The process of claim 1, wherein: the size of the quench zone in the reactor is a function of a droplet size of the quench fluid injected into, or formed in, the quench zone. 14. The process of claim 1, wherein: a rate of quench fluid injection is regulated in relation to a rate in which the feed material is introduced. 15. The process of claim 1, further comprising: monitoring temperature in two or more output ducts and adjusting quench fluid flow through nozzles to make syngas flow through the ducts more uniform. 16. The process of claim 1, wherein: the step of feeding feed material into the reactor vessel includes supplying feed material from one or more external feed sources through one or more feed ports in a wall of the middle section of the reactor vessel, said feed ports being located no higher than above, and proximate to, an upper surface of the bed of deposited feed material; andthe step of maintaining conditions in the vessel such that unreacted particles from the middle section are subjected to further reactions in a first, lower, part of the top section are performed in a manner to enhance reactivity of particulate matter within the feed material by proximity to the feed bed and prolonging residence time of the unreacted particles, promoting additional reactions thereof, before the syngas mixture reaches an outlet in the reactor vessel. 17. The process of claim 16, wherein: the feeding of feed material is performed in a substantially continuous and uniform manner. 18. The process of claim 16, wherein: the feeding of feed material includes use of one or more feed ports located immediately above the bed of deposited feed material and angled upwardly to avoid excess heating by the bed reactions of feed material in the feed ports. 19. The process of claim 16, wherein: the feeding of feed material includes using one or more feed ports configured to feed material directly into the bed of deposited feed material with substantial reaction of the feed material from the feed ports within the bed itself. 20. The process of claim 1, further comprising: replacing reacted carbonaceous material in the bottom section with additional carbonaceous material supplied through the one or more feed ports of a wall of the middle section. 21. A process for gasification of solid feed material to produce a syngas in a reactor vessel including a bottom section, a top section, and a middle section between the bottom section and the top section, the method comprising: providing a plasma heated carbonaceous bed in the bottom section of a reactor vessel;feeding feed material into the reactor vessel to form a bed of deposited feed material on top of the carbonaceous bed in the bottom section;reacting the feed material with hot gases rising from the bottom section;forming, in the middle section of the reactor vessel, a syngas mixture containing a varying quantity of unreacted particles of the feed material, wherein the middle section is configured as a truncated inverse cone that is wider adjacent the top section than adjacent the bottom section and configured to contain the bed of deposited feed material;allowing the syngas mixture to rise into the top section of the reactor vessel toward one or more syngas outlets in a roof of the reactor vessel, wherein the top section includes a conical part starting adjacent the middle section that has an overall configuration of a truncated cone that is wider at a higher end of the conical part than adjacent the middle section, the top section including a freeboard region in a lower part of the top section and a quench zone in an upper part of the top section, and wherein the middle section truncated inverse cone has a larger wall angle relative to a center line of the vessel than the wall angle of the conical part of the top section;maintaining conditions in the vessel such that unreacted particles from the middle section are subjected to further reactions in the lower part of the top section; andat least partially quenching, by injecting a quench fluid including water, steam, or a mixture thereof, through a plurality of quench fluid inlets in the roof into a quench zone in the upper part of the top section, at least some of the unreacted particles sufficiently to reduce the number of unreacted particles exiting the reactor vessel that are likely to be deposited on walls of external ductwork.