A device for thermal treatment comprises at least a preheater, a calciner, and a materials cooler, wherein a solids stream is guided into the preheater, from the preheater into the calciner, from the calciner into the materials cooler, and out of the materials cooler, wherein a gas stream is guided into the materials cooler, from the materials cooler into the calciner, from the calciner into the preheater, and out of the preheater, wherein the device comprises a combustion chamber, wherein the gas stream from the materials cooler is guided at least partially through the combustion chamber into the calciner, wherein a residence time device is arranged between the combustion chamber and the calciner.

A device for thermal treatment comprises at least a preheater, a calciner, and a materials cooler, wherein a solids stream is guided into the preheater, from the preheater into the calciner, from the calciner into the materials cooler, and out of the materials cooler, wherein a gas stream is guided into the materials cooler, from the materials cooler into the calciner, from the calciner into the preheater, and out of the preheater, wherein the device comprises a combustion chamber, wherein the gas stream from the materials cooler is guided at least partially through the combustion chamber into the calciner, wherein a residence time device is arranged between the combustion chamber and the calciner.

A steel making plant includes an electric arc furnace and a fume collection and treatment system. The system includes a first primary suction line fluidically connected to the electric arc furnace to suck fumes generated in the electric arc furnace. A secondary suction line is for ventilating the environment surrounding the electric arc furnace by a suction hood. A filtration apparatus is for filtering emissions collected by the fume collection and treatment system before they are discharged into the atmosphere. The electric arc furnace is powered by a continuous charging system. A fume cooling apparatus, a dust collecting device and a denox selective catalytic reduction apparatus are arranged in sequence along the first primary suction line, starting from the electric arc furnace. The secondary suction line flows into the first primary suction line downstream of the denox selective catalytic reduction apparatus and upstream of the filtration apparatus.

A steel making plant includes an electric arc furnace and a fume collection and treatment system. The system includes a first primary suction line fluidically connected to the electric arc furnace to suck fumes generated in the electric arc furnace. A secondary suction line is for ventilating the environment surrounding the electric arc furnace by a suction hood. A filtration apparatus is for filtering emissions collected by the fume collection and treatment system before they are discharged into the atmosphere. The electric arc furnace is powered by a continuous charging system. A fume cooling apparatus, a dust collecting device and a denox selective catalytic reduction apparatus are arranged in sequence along the first primary suction line, starting from the electric arc furnace. The secondary suction line flows into the first primary suction line downstream of the denox selective catalytic reduction apparatus and upstream of the filtration apparatus.

A furnace tube and a using method of the same are provided. The furnace tube includes a chamber for processing a wafer; a normal-pressure gas intake device and a low-pressure gas intake device configured to supply gas to the chamber, wherein each of the normal-pressure gas intake device and the low-pressure gas intake device is independently connected to the chamber; a normal-pressure control device and a low-pressure control device configured to control an air pressure in the chamber, wherein each of the normal-pressure control device and the low-pressure control device is configured to independently control the air pressure in the chamber; and a normal-pressure gas injection pipe located inside the chamber and connected to the normal-pressure gas intake device, and a low-pressure gas injection pipe located inside the chamber and connected to the low-pressure gas intake device.

A furnace tube and a using method of the same are provided. The furnace tube includes a chamber for processing a wafer; a normal-pressure gas intake device and a low-pressure gas intake device configured to supply gas to the chamber, wherein each of the normal-pressure gas intake device and the low-pressure gas intake device is independently connected to the chamber; a normal-pressure control device and a low-pressure control device configured to control an air pressure in the chamber, wherein each of the normal-pressure control device and the low-pressure control device is configured to independently control the air pressure in the chamber; and a normal-pressure gas injection pipe located inside the chamber and connected to the normal-pressure gas intake device, and a low-pressure gas injection pipe located inside the chamber and connected to the low-pressure gas intake device.