Patent EP-2166081-A2 (EP)
Inventor: CHOWDHURY RAJIB PAL
IPC: C12M1/107
Filed: 2008-11-06
Abstract: The biogas plant comprises a fermenter-container (2) with rectangular base form having a base wall, two oppositively lying longitudinal walls, two oppositively lying side walls and/or an upper cover. The fermenter container consists of rectangular support cage with a grid structure, vertical support (24) at the wall side, longitudinal carriers (33), cross girder and if necessary traction elements and/or stiffening element for forming its wall. The support cage is planked with plate elements for forming the longitudinal walls and side walls. The biogas plant comprises a fermenter-container (2) with rectangular base form having a base wall, two oppositively lying longitudinal walls, two oppositively lying side walls and/or an upper cover. The fermenter container consists of rectangular support cage with a grid structure, vertical support (24) at the wall side, longitudinal carriers (33), cross girder and if necessary traction elements and/or stiffening element for forming its wall. The support cage is planked with plate elements for forming the longitudinal walls and side walls. The base wall, the longitudinal walls and the side walls are coated and covered with interior film. The grid structure element of the support cage and the plate elements forms planking in non-mounting condition of a fermenter container-mounting assembly. The fermenter container is produced with staggered standardized size such as length of 24 m, width of 12 m and height of 4 m for an electric power of 150 kW of the biological plant and/or in size for 100 kW, 70 kW and 35 kW. The fermenter container and if necessary prefabricated heating power station and technical container belonging to fermenter container-construction kit and if necessary further device arranged near to the fermenter container are roofed with a pent roof as photovoltaic roof. The grid structure element of the support cage is formed from a base side lower longitudinal carriers and lower transverse carrier to produce a lower rectangle frame, from vertical supports that are mounted at the lower rectangle frames distanced against each other with a lower end area, and from upper longitudinal carriers and upper transverse carrier to produce an upper rectangle frame that is connected respectively with the upper end-area of the vertical support. A strap web is subjected in the base wall field of the lower rectangle frame and connects with parallel metal flat band, oppositively lying longitudinal carriers and transverse carrier in the area of the mounting position of the vertical support. In the upper horizontal plane of the upper rectangle frame between the longitudinal carriers and/or transverse carriers, supporting tubes and/or stainless steel ropes are subjected transverse to the carrier. Further transverse carriers are connected with the vertical supports parallel and distanced to lower rectangle frame and form a closed rectangle frame. Metal rods overlap in the side wall fields between the vertical supports in a side wall field or two or more side wall fields and are mounted to the supporting element and the tensioning element. The vertical support, the longitudinal carrier as steel-double-T-carrier and/or steel angle carrier are produced from metal or wood and are screwed together. The base wall of the fermenter container is formed through a plane mounting base or a non-reinforced lean concrete plate on which a heat insulation layer is laid out from heat insulation plate over the interior film. The strap web covers on both sides of the plant and is imbedded in lean concrete. The heat insulation layer and the interior film are laid out on the covering layer. The plate elements are water-tight sandwich panel as planking of the longitudinal walls and side walls, with integrated insulation material core and/or steel plate with heat insulation layer, casing, plastic plate, wood fiber plate or wood boards with heat insulation layer and casing. The plate elements are rectangular plates with a length corresponding to the fermenter container height and vertically directed from the interior to the side wall of the support cage or supported with a length corresponding to the width of side wall fields horizontally directed between the vertical supports. The fermenter container comprises a flow-longitudinal middle wall (13) distanced to the side walls, where the middle wall is prefabricated in fermenter container-mounting assembly as mounting module. An agitator is formed as an agitator mechanism or as rod stirrer for the construction of a ring-shaped substrate flow to flow longitudinal middle wall. Heating elements are subjected and/or integrated to the flow longitudinal middle wall. The heating elements are heating tube (34) passing on the flow-longitudinal middle wall, which consists of solid materials and/or flexible web mounted at a stand. The interior film is implemented as fabric reinforced PVC-film and/or as flexible polypropylene sealing web. The further building element exposing the fermenter groove area is produced from V4A steel or coated with epoxide resin. A double walled tent roof is equipped as upper cover of the fermenter container with integrated gas storage, and/or equipped in a height of the longitudinal wall and side walls in corresponding height of the flow-longitudinal middle wall along and/or transverse to the running harness set. The upper edge of the longitudinal wall and side wall is overlapped to the plate element edges of the planking by a profile strip at whose upper profile base, edges of the two roof membranes are mounted and connected to fermenter interior profile shank corresponding to the upper edge of the interior film.