A process for gasifying a carbonaceous material, comprising the steps of: (a) providing a gasification reactor comprising a reactor upper section and a reactor lower section; (b) introducing a substantially dry solid carbonaceous feedstock stream, optionally selected from the group consisting of coal, lignite, petroleum coke and mixtures thereof, into the reactor upper section and reacting therein with a first mixture product from the reactor lower section, thereby forming a second mixture product, wherein the first mixture product comprises syngas, and wherein the second mixture product comprises a second solid product and a second gaseous product; (c) passing the second mixture product to a first separating device, wherein the second solid product is separated from the second gaseous product; (d) passing the separated second solid product into the reactor lower section; (e) passing the second gaseous product stream exiting the first separating device through a heat recovery unit, thereby lowering the temperature of the second gaseous product stream to provide a cooled second gaseous product and creating steam; (f) passing the steam produced in step (e) into the reactor lower section; (g) pulverizing a solid carbonaceous feedstock; (h) mixing the pulverized solid carbonaceous feedstock with the cooled second gaseous product of step (e) by means of a solid-gas mixer to form a warm solid-gas mixture, wherein said warm solid-gas mixture is maintained at a temperature in a range of 148°C (300°F) to 537°C (1000°F); (i) separating the warm solid-gas mixture in a second separating device to produce the substantially dry solid carbonaceous feedstock of step (b) and a separated second gaseous product; (j) passing the separated second gaseous product exiting the second separating device to a particulate filtering device, wherein a stream of residual solids, fines and particulates is removed and passed into the reactor upper section; and (k) combining a gas stream, the separated second solid product stream of step (d) and the steam produced in the heat recovery unit of step (e) in the reactor lower section and reacting them, thereby evolving heat and forming the first mixture product comprising syngas of step (b), wherein the gas stream comprises an oxygen supply selected from the group consisting of an oxygen-containing gas, steam, and mixtures thereof. (a) providing a gasification reactor comprising a reactor upper section and a reactor lower section; (b) introducing a substantially dry solid carbonaceous feedstock stream, optionally selected from the group consisting of coal, lignite, petroleum coke and mixtures thereof, into the reactor upper section and reacting therein with a first mixture product from the reactor lower section, thereby forming a second mixture product, wherein the first mixture product comprises syngas, and wherein the second mixture product comprises a second solid product and a second gaseous product; (c) passing the second mixture product to a first separating device, wherein the second solid product is separated from the second gaseous product; (d) passing the separated second solid product into the reactor lower section; (e) passing the second gaseous product stream exiting the first separating device through a heat recovery unit, thereby lowering the temperature of the second gaseous product stream to provide a cooled second gaseous product and creating steam; (f) passing the steam produced in step (e) into the reactor lower section; (g) pulverizing a solid carbonaceous feedstock; (h) mixing the pulverized solid carbonaceous feedstock with the cooled second gaseous product of step (e) by means of a solid-gas mixer to form a warm solid-gas mixture, wherein said warm solid-gas mixture is maintained at a temperature in a range of 148°C (300°F) to 537°C (1000°F); (i) separating the warm solid-gas mixture in a second separating device to produce the substantially dry solid carbonaceous feedstock of step (b) and a separated second gaseous product; (j) passing the separated second gaseous product exiting the second separating device to a particulate filtering device, wherein a stream of residual solids, fines and particulates is removed and passed into the reactor upper section; and (k) combining a gas stream, the separated second solid product stream of step (d) and the steam produced in the heat recovery unit of step (e) in the reactor lower section and reacting them, thereby evolving heat and forming the first mixture product comprising syngas of step (b), wherein the gas stream comprises an oxygen supply selected from the group consisting of an oxygen-containing gas, steam, and mixtures thereof.