| 摘要 |
<p>The invention relates to furnace, comprising a device and a method generating a reducing atmosphere for annealing furnaces. The furnace according to the invention for heating up sheet steel parts to the austenitic temperature between 850°C and 950°C [850°F and 1742°F] has an interior and a furnace roof as well as a device that is installed vertically in the furnace roof in such a way that one part of the device projects into the furnace opposite from the z-direction, while the other part projects out of the furnace, whereby, on the part projecting out of the furnace, the device has a connection piece through which a nitrogen-oxygen mixture can be fed in as well as another connection piece through which coal granules can be fed in, and there is a gas-permeable floor at the bottom of the part of the device that projects into the furnace and that is located opposite from the z-direction. Here, the gas-permeable floor of the device can capture the coal granules that were fed in, a process in which the floor remains gas-permeable. The device projects so far towards the interior of the furnace that a temperature of at least 750°C [1382°F] is established inside the device at the level of the gas-permeable floor when the temperature in the interior of the furnace is at least 850°C [1562°F]. Consequently, during operation of the furnace, the temperature inside the device at the level of the gas-permeable floor is at or above the self-ignition temperature of the coal granules.</p> |
