Abstract: A grate block for a combustion grate, wherein consecutive grate blocks are arranged one over the other in a staircase manner and rearrange to convey the combustible material during combustion by means of pushing motions performed in relation to each other. The grate block includes a block body including an upper wall forming a bearing surface, along which wall the combustible material is conveyed, and a front wall forming a push surface, which has first air supply openings formed by a first air supply channel for feeding air to the combustion grate, and a lower bearing edge intended to come into contact with the bearing surface of a grate block located adjacent in the pushing direction S. Further air supply channels, which traverse and are directed obliquely with respect to the direction of the first air supply channels, are arranged in the upper and front walls for cooling the walls.

Abstract: A helical screw conveyor unit, worm shaft, worm extruder and method for providing a worm shaft, wherein the helical screw conveyor unit is an exchangeable element for a helicoidally or spirally winding helix of a worm shaft, having a main body with a helicoidally winding helix element, wherein the helical screw conveyor unit is serviced with little outlay on servicing, the top side of the lateral surface is concavely curved in shell-like form about the longitudinal axis, and the main body has a radial opening for the leadthrough of a fastening region of a worm shaft shank, the helix element has at most one half of one helix turn, the the main body lateral surface has an inner surface for being seated on the fastening region, and the helical screw conveyor unit has at least one fastening element for detachably fastening the main body to the fastening region.

Abstract: A process for removing CO2 from a methane-containing gas, having the steps of providing a methane-containing gas containing at least CO2 as an impurity, cooling the gas to remove CO2 from the methane-containing gas by freezing out same, and additionally reducing the CO2 concentration of the gas using a pressure temperature swing adsorption apparatus (PTSA), whereby a methane-enriched product gas is obtained. At least a part of the product gas is then used as treatment gas and is passed through the PTSA for treatment of the PTSA, whereby CO2 is absorbed by the treatment gas and is removed from the PTSA as a CO2-enriched treatment gas. The treatment gas is then recycled and admixed with the methane containing gas.

Abstract: A grate block including a block body formed as a cast part with a rear end and a front end that lies opposite the rear end in the conveying direction. The block body includes an upper wall which forms an outer rear bearing surface, running at least in part parallel to a longitudinal axis of the block body, for the waste that is to be treated, wherein the bearing surface defines a substantially horizontal plane. The block body further includes a raised nose arranged in the region of front end, which nose has an outer front bearing surface with a middle part that rises in the manner of a ramp in the conveying direction. The raised nose includes, following the outer front bearing surface, an apex and, after the apex in the conveying direction, a declining end portion with a discharge surface that drops away in a substantially arcuate manner.

Abstract: A cooled grate block as part of a grate for a system for thermally treating waste, including: a block body in the form of a cast part having an outer supporting face for the waste to be treated; a flat cavity situated directly below the supporting face, for receiving a cooling fluid; a fluid feed line and a fluid discharge line, which are connected to the cavity; at least one deflection element, which is arranged in the cavity to direct a cooling fluid within the cavity from the fluid feed line to the fluid discharge line; and a valve element situated in the end region of the cavity, for distributing the cooling fluid fed into the cavity through the fluid feed line.

Abstract: A grate block including a block body formed as a cast part with a rear end and a front end that lies opposite the rear end in the conveying direction. The block body includes an upper wall which forms an outer rear bearing surface, running at least in part parallel to a longitudinal axis of the block body, for the waste that is to be treated, wherein the bearing surface defines a substantially horizontal plane. The block body further includes a raised nose arranged in the region of front end, which nose has an outer front bearing surface with a middle part that rises in the manner of a ramp in the conveying direction. The raised nose includes, following the outer front bearing surface, an apex and, after the apex in the conveying direction, a declining end portion with a discharge surface that drops away in a substantially arcuate manner.

Abstract: A fixed bed arrangement formed as an insert for a reactor for catalytic conversion of reaction media, in particular for catalytic methanation of a gas mixture including hydrogen and carbon dioxide, having a receiving chamber, which extends axially within an outer sleeve, and through which reaction media flows during the reactor operation for receiving a catalyst material, and a heat exchanger arrangement having a fluid flow path for a temperature control fluid, which fluid flow path is spatially separated from the receiving chamber, for removing and supplying heat from/to the process. The outer sleeve is formed by the heat exchanger arrangement, at least in regions. The fixed bed arrangement includes a reactor for the catalytic reaction of reaction media having a pressure chamber for receiving reaction media, and such a fixed bed arrangement inserted into the pressure chamber.

Abstract: A grate block for a combustion grate including a block body having an upper wall which forms a bearing surface and along which the combustible material is to be conveyed and a front wall which has a lower bearing edge, the bearing edge being designed to come into contact with the bearing surface of an adjacent grate block in a feed direction, wherein the upper wall has an air supply opening formed by an air supply channel. The air supply opening is at least partially surrounded by a thickened portion which protrudes from the bearing surface, forms a protective channel extending the air supply channel, and is designed to prevent liquid from flowing into the air supply opening.

Abstract: A grate block for a combustion grate, wherein consecutive grate blocks are arranged one over the other in a staircase manner and rearrange to convey the combustible material during combustion by means of pushing motions performed in relation to each other. The grate block includes a block body including an upper wall forming a bearing surface, along which wall the combustible material is conveyed, and a front wall forming a push surface, which has first air supply openings formed by a first air supply channel for feeding air to the combustion grate, and a lower bearing edge intended to come into contact with the bearing surface of a grate block located adjacent in the pushing direction S. Further air supply channels, which traverse and are directed obliquely with respect to the direction of the first air supply channels, are arranged in the upper and front walls for cooling the walls.

Abstract: An anaerobic biogas plant for the digestion of fresh organic digestion substrate. The digester having an entry section with an inlet at a first end, a rear section at a second, opposite end, and a middle section arranged between the entry section and the rear section. The digester further includes a stirring unit comprising a shaft extending in the direction from the first end to the second end and having at least one agitating arm for mixing the substrate within the digester. The middle section of the digester includes a main outlet and the rear section includes an additional outlet. The digester further includes a separate return line leading from the additional outlet back to the entry section of the digester for allowing a direct return of a minor fraction of digested substrate removed from the rear section back into the entry section of the digester.

Abstract: A biogas plant includes a fermenter, a biogas processing unit and a thermal engine. The biogas processing unit includes a gas separation unit and a compression unit for the separation of raw biogas from the fermenter into two gas streams, whereby the first gas stream includes a product gas that is enriched in biomethane with respect to the composition of the raw biogas and the second gas stream includes a residual gas that is enriched with carbon dioxide with respect to the composition of the raw biogas and has a biomethane concentration of less than 20%. The thermal engine produces energy that is used for operation of the compression unit.

Abstract: A grate block for a combustion grate, wherein consecutive grate blocks are arranged in a staircase and are designed to rearrange and convey the combustible material during combustion through pushing motions. The grate block includes a block body, an upper wall forming a supporting surface, and an extension parallel to a longitudinal axis L of the body. The supporting surface drops into a pushing surface formed by a front wall, which has at least one air supply opening for supplying air to the combustion grate, which extends at a right angle or slant to the pushing surface. In the lowest region of the front wall, formed as a foot, which lays on the supporting surface of a grate block, is adjacent in the pushing direction. The front resting edge of the pushing surface is arranged in a plane E extending at a right angle to the longitudinal axis L.

Abstract: A screw press includes a press chamber in which a screw shaft is mounted such that the screw shaft is surrounded by a screen jacket and is rotatable about a screw shaft axis. The screen jacket is fastened to a screen jacket holding device including at least one beam running through the press chamber. The screen jacket is formed of a plurality of multipart screen baskets configured to receive a plurality of screen basket inserts, each multipart screen basket of the plurality of multipart screen baskets includes a semi-cylindrical first screen basket half shell and a semi-cylindrical second screen basket half shell. At least one pivot hinge is disposed between the first screen basket half shell and the second screen basket half shell. A basket lug is disposed on the first screen basket half shell and the second screen basket half shell.

Abstract: A process for optimizing the operation of a plug-flow fermenter for the anaerobic fermentation of organic wastes, wherein the plug-flow fermenter comprises a horizontally oriented fermenter tank and a stirrer, which stirrer comprises a stirrer shaft which traverses the interior of the fermenter tank in an axial manner and multiple paddles which are arranged on the stirrer shaft and protrude radially and also a drive, and the fermentation material is moved in the fermenter tank by means of the stirrer.

Abstract: A construction method of a fermenter, which has a fermenter cage and a fermenter shell made of metal, for use in a biogas plant, wherein the fermenter shell surrounds the fermenter cage making the fermenter shell gas-tight. The fermenter cage is formed by a plurality of cage rings, wherein each cage ring is supported on at least one cage-retaining device having at least one rolling device in such a way that the entire fermenter cage is rotatably supported about a longitudinal axis, wherein the fermenter cage is lined with a plurality of rows of shell plates by way of rotation about the longitudinal axis and the shell plates are permanently fastened to the inner surfaces of the plurality of cage rings and thus the fermenter shell is formed.

Abstract: A method generates superheated steam using heat generated in a boiler of an incineration plant. The pre-superheated steam is fed to a final superheater that includes a plurality of final superheater pipes through which the pre-superheated steam is guided and is finally superheated in the process. The final superheater pipes (are arranged at least partially in at least one cavity (formed in an interior of a wall element of the boiler and/or of a bulkhead arranged in the boiler. The cavity is closed off on a boiler side at least partially by a refractory material layer and is flowed over by flue gas released during combustion. A secondary medium flows through the cavity and is heated via heat transfer from the flue gas via the refractory material layer. The heated secondary medium is fed via a secondary medium feed line to a secondary heat exchanger.

Abstract: A process for optimizing the operation of a plug-flow fermenter for the anaerobic fermentation of organic wastes, wherein the plug-flow fermenter comprises a horizontally oriented fermenter tank and a stirrer, which stirrer comprises a stirrer shaft which traverses the interior of the fermenter tank in an axial manner and multiple paddles which are arranged on the stirrer shaft and protrude radially and also a drive, and the fermentation material is moved in the fermenter tank by means of the stirrer.

Abstract: A method for cooling solid residues of a combustion process, which are deposited onto the conveying surface of a conveyor belt of a conveying device and are conveyed in the direction of a solid residue outlet, wherein during conveying heat is transferred from the solid residues to a gaseous coolant. The method is characterized in that the conveyor belt is acted upon by coolant only on its side oriented away from the conveying surface, the conveyor belt is essentially impermeable to the coolant and at least part of the coolant heated by contact with the conveyor belt is extracted on that side oriented away from the conveying surface.

Abstract: A method processes slag occurring in a combustion chamber. An incineration grate is formed at least in its end region that is facing the slag-removing device as a separating grate, which has openings, via which the chamber is connected to a fine-slag discharge chamber, and at least one fine fraction of the slag is ejected through the openings into the discharge chamber and discharged in a substantially dry state, and the remaining coarse fraction is fed to the slag-removing device and discharged. In this case, the average particle size of the at least one fine fraction is smaller than the average particle size of the coarse fraction. The separating grate has at least in certain regions air feeds that are distributed over its entire width and via which air is fed in a controlled manner to the slag, and the air feeds are isolated from the openings and formed separately.

Abstract: A biogas plant fermenter supply method increases total throughput of substrate through fermenter chambers while not changing the number of fermenter chambers. An inoculum fermenter chamber is supplied with raw fermentation substrate and fermenting for a dwell time, returning part of the substrate fermented in the inoculum fermenter chamber in the form of a self-inoculating substrate to the inoculum fermenter chamber by a return path, the part being mixed with the raw fermentation substrate, and supplying a fast fermenter chamber coupled to the inoculum fermenter chamber with an additional part of the substrate fermented in the inoculum fermenter chamber in the form of a fast fermenter inoculation substrate and mixing the additional part with fast fermenter raw substrate of an amount per unit of time, wherein fermented output substrate is removed from the fast fermenter chamber after a dwell time of the substrate mixture introduced into the fast fermenter chamber.