An electrostatic spray drying system for drying liquid into powder comprising: an elongated structural body supported in upright position; a closure arrangement at opposite upper and lower ends of the elongated body for forming a drying chamber within said elongated body; one of said closure arrangements including a drying gas inlet for coupling to a drying gas source and for directing drying gas into said drying zone; an electrostatic spray nozzle assembly supported in one of the closure arrangements (14,18); said electrostatic spray nozzle assembly including a nozzle body having a discharge spray tip assembly at a downstream end thereof for directing liquid to be dried into said drying zone; said electrostatic spray nozzle assembly having a liquid inlet for coupling to a supply of liquid to be discharged into the drying zone and an electrode for coupling to an electrical source for electrically charging liquid passing through said spray nozzle assembly for discharge from said discharge spray tip assembly into said drying zone; and characterized in that the system comprises a non-structural non-metallic liner disposed within said elongated body in spaced relation to an inner wall surface of the elongated body for defining an internal drying zone within said elongated body; a circumferentially disposed support is provided for releasably supporting said liner within said elongated structural body and for enabling selective removal and replacement of the liner following usage of the electrostatic spray drying system; wherein said circumferentially disposed support includes a plurality of circumferentially spaced non-metallic stand offs for supporting said liner in electrically isolated relation to the elongated structural body. an elongated structural body supported in upright position; a closure arrangement at opposite upper and lower ends of the elongated body for forming a drying chamber within said elongated body; one of said closure arrangements including a drying gas inlet for coupling to a drying gas source and for directing drying gas into said drying zone; an electrostatic spray nozzle assembly supported in one of the closure arrangements (14,18); said electrostatic spray nozzle assembly including a nozzle body having a discharge spray tip assembly at a downstream end thereof for directing liquid to be dried into said drying zone; said electrostatic spray nozzle assembly having a liquid inlet for coupling to a supply of liquid to be discharged into the drying zone and an electrode for coupling to an electrical source for electrically charging liquid passing through said spray nozzle assembly for discharge from said discharge spray tip assembly into said drying zone; and characterized in that the system comprises a non-structural non-metallic liner disposed within said elongated body in spaced relation to an inner wall surface of the elongated body for defining an internal drying zone within said elongated body; a circumferentially disposed support is provided for releasably supporting said liner within said elongated structural body and for enabling selective removal and replacement of the liner following usage of the electrostatic spray drying system; wherein said circumferentially disposed support includes a plurality of circumferentially spaced non-metallic stand offs for supporting said liner in electrically isolated relation to the elongated structural body.