Abstract: A method for producing a lightweight ceramic aggregate, particularly from coal ash, according to the invention is characterized in that the raw material mixture of the total moisture content preferably below 20% by weight consisting of power station ashes originating from combusting coal, or ashes from combusting coal in a mixture with biomass ash, or ashes from co-combusting biomass with coal and phosphogypsum in an amount of up to 50% by weight, taken from dumps and/or from direct dump from a power station or a heat and power station, the raw materials from the dumps preferably being heated up in winter by a mixture of atmospheric air and exhaust gases from the step of burning and sintering, with a content of non-burnt coal above 6% by weight, agglomeration promoting agents like silty non-organic materials, preferably bentonite, preferably in an amount of up to 4% by weight, clay preferably up to 6% by weight, organic waste materials like used paints and lacquers, after-fermentation sludge in an amount pref

Abstract: A method for producing a lightweight ceramic aggregate, particularly from coal ash, according to the invention is characterized in that the raw material mixture of the total moisture content preferably below 20% by weight consisting of power station ashes originating from combusting coal, or ashes from combusting coal in a mixture with biomass ash, or ashes from co-combusting biomass with coal and phosphogypsum in an amount of up to 50% by weight, taken from dumps and/or from direct dump from a power station or a heat and power station, the raw materials from the dumps preferably being heated up in winter by a mixture of atmospheric air and exhaust gases from the step of burning and sintering, with a content of non-burnt coal above 6% by weight, agglomeration promoting agents like silty non-organic materials, preferably bentonite, preferably in an amount of up to 4% by weight, clay preferably up to 6% by weight, organic waste materials like used paints and lacquers, after-fermentation sludge in an amount pref

Abstract: A counter-current shaft dryer with moving shelves for drying agglomerates of a small mechanical strength having a vertical shaft, which comprises a top charging zone, a multi-level drying zone, preferably comprising from two thru six levels and a bottom discharging zone. An outlet stub pipe or outlet collector of drying gases situated between the bottom discharging zone and the drying zone. An outlet stub pipe or outlet collector of moist gases situated between the drying zone and the top charging zone. Shelves of the charging zone and the discharging zone are made of a number of rectangular not perforated sheet metal plates. Shelves of the drying zone are made of a number of rectangular perforated sheet metal plates. Every rectangular metal sheet plate shelf is attached along its long edge to parallel pins mounted swiveling to walls of the shaft, transverse against the axis of the shaft.

Abstract: A counter-current shaft dryer with moving shelves for drying agglomerates of a small mechanical strength having a vertical shaft, which comprises a top charging zone, a multi-level drying zone, preferably comprising from two thru six levels and a bottom discharging zone. An outlet stub pipe or outlet collector of drying gases situated between the bottom discharging zone and the drying zone. An outlet stub pipe or outlet collector of moist gases situated between the drying zone and the top charging zone. Shelves of the charging zone and the discharging zone are made of a number of rectangular not perforated sheet metal plates. Shelves of the drying zone are made of a number of rectangular perforated sheet metal plates. Every rectangular metal sheet plate shelf is attached along its long edge to parallel pins mounted swiveling to walls of the shaft, transverse against the axis of the shaft.

Abstract: A serpentine type evaporator for use in a refrigeration circuit, which comprises a serpentine flat tube including a plurality of spaced essentially parallel planar portions and a plurality of bent portions, fins interposed between opposed outer surfaces of the serpentine flat tube, an inlet header pipe connected to one end of the serpentine flat tube, an inlet pipe connected to the inlet header pipe, an outlet header pipe connected to the other end of the serpentine flat tube, and an outlet pipe connected to the outlet header pipe. At least one of the inlet pipe and the outlet pipe are connected perpendicularly to one of said inlet header pipe or the outlet header pipe.