A freeze drying vessel for a freeze drying system having a freezing vessel that generates frozen product particles by freezing drops of fluid product, comprising: a freeze drying chamber having a drying chamber inlet that receives the frozen product particles, a vacuum port through which the drying chamber is evacuated to a first vacuum pressure and a drying chamber outlet; a plurality of sloped horizontal shelves that receive the frozen particles, wherein the shelves are arranged vertically in the drying chamber to provide top and bottom shelves and a plurality of shelves between the top and bottom shelves, wherein said plurality of sloped shelves comprise first (358, 362, 366, 370) shelves arranged with a slope downwards in a first direction and second (360, 364, 368, 372) shelves arranged with a slope downwards in a second direction, the first and second directions being opposite to each other; a plurality of connecting members (374, 376, 378, 380, 382, 384, 386, 386, 388) comprising at least one first (374, 378, 382, 386) connecting member and at least one second (376, 380, 384, 388) connecting member, wherein the at least one first (374, 378, 382, 386) connecting member is attached to at least two shelves taken only among the first shelves and the at least one second (376, 380, 384, 388) connecting member is attached to at least two shelves taken only among the second shelves, the at least one first connecting member being different from the at least one second connecting member; a plurality of vibration elements (396, 398, 400, 402) located outside the drying chamber and comprising at least one first (396, 398) vibration element and at least one second (400, 402) vibration element, wherein the at least one first connecting member and the at least one second connecting member are attached to the first and the second vibration element respectively, the at least one first vibration element being different from the at least one second vibration element, and wherein each vibration element is configured to vibrate an associated connecting member and consequently the attached shelves having only the slope in the same downward direction, wherein the plurality of sloped shelves heat the frozen particles to promote sublimation of the frozen particles and simultaneously vibrate in such a manner to cause the frozen particles to advance along the plurality of sloped shelves and to drop downward from shelf to shelf forming freeze dried product in powder form which is discharged through the drying chamber outlet. a freeze drying chamber having a drying chamber inlet that receives the frozen product particles, a vacuum port through which the drying chamber is evacuated to a first vacuum pressure and a drying chamber outlet; a plurality of sloped horizontal shelves that receive the frozen particles, wherein the shelves are arranged vertically in the drying chamber to provide top and bottom shelves and a plurality of shelves between the top and bottom shelves, wherein said plurality of sloped shelves comprise first (358, 362, 366, 370) shelves arranged with a slope downwards in a first direction and second (360, 364, 368, 372) shelves arranged with a slope downwards in a second direction, the first and second directions being opposite to each other; a plurality of connecting members (374, 376, 378, 380, 382, 384, 386, 386, 388) comprising at least one first (374, 378, 382, 386) connecting member and at least one second (376, 380, 384, 388) connecting member, wherein the at least one first (374, 378, 382, 386) connecting member is attached to at least two shelves taken only among the first shelves and the at least one second (376, 380, 384, 388) connecting member is attached to at least two shelves taken only among the second shelves, the at least one first connecting member being different from the at least one second connecting member; a plurality of vibration elements (396, 398, 400, 402) located outside the drying chamber and comprising at least one first (396, 398) vibration element and at least one second (400, 402) vibration element, wherein the at least one first connecting member and the at least one second connecting member are attached to the first and the second vibration element respectively, the at least one first vibration element being different from the at least one second vibration element, and wherein each vibration element is configured to vibrate an associated connecting member and consequently the attached shelves having only the slope in the same downward direction, wherein the plurality of sloped shelves heat the frozen particles to promote sublimation of the frozen particles and simultaneously vibrate in such a manner to cause the frozen particles to advance along the plurality of sloped shelves and to drop downward from shelf to shelf forming freeze dried product in powder form which is discharged through the drying chamber outlet.