Vessel for storing particulate matter and discharge device for use in the same

A vessel for storing particulate matter, comprising a main part having a bottom portion, said main part having a first flange positioned at or near a lower rim of the bottom portion, the vessel further comprising at least one discharge device, which discharge device comprises a converging outer shell and a permeable, converging inner shell with an upper rim positioned in the outer shell, the outer shell having a second flange at or near an upper rim of the outer shell, the discharge device being connected to the main part of the vessel by means of the first flange and the second flange;

• wherein the inner shell is secured at or near its upper rim to an inner wall of the outer shell of the discharge device, wherein the main part of the vessel has an inner wall and an element for matching the inner wall of the main part of the vessel to the inner wall of the inner shell of the discharge device wherein the element is attached to the inner wall of the first flange;
• wherein the outer shell comprises, at a bottom portion thereof, a third flange having a central opening and wherein a lower end portion of the inner shell is essentially cylindrical and is positioned in line with the central opening of the third flange and/or extends through this opening;
• wherein the cylindrical lower portion of the inner shell and the outer shell define a cavity, the vessel further comprising a stuffing box assembly positioned between the cylindrical lower portion of the inner shell and the outer shell, which assembly seals said cavity.