Method for generating a negative pressure in a coke oven chamber during the discharging and charging processes

Abstract

A method for extracting flue gases from a coke oven chamber, wherein the flue gases that develop briefly during the process of discharging and charging the coke cake from and to the coke oven chamber are extracted by a vacuum generated in the headspace above the coke cake. The vacuum in the headspace above the coke oven chamber is generated via channels through the lateral walls of the coke oven chamber or in the coke cake. The vacuum is generated in the secondary heating chamber and, by way of example, can be extracted again from a vacuum supply tank which, for the time that the coke oven chamber doors are open, is connected to the secondary heating chamber by opening shut-off devices in the connecting line. The method avoids the undesirable emission of flue gases into the atmosphere. A device whereby the method can be carried out is also disclosed.

1 . Method for generating a negative pressure in a coke oven chamber during the process of coke pushing and coal charging, wherein
 the coke oven chamber is filled with a layer of coal for coal carbonization, whereby flue gases are generated, and   after coal charging, the coal is heated-up for coal carbonization, and wherein   these volatile coal constituents are partially oxidized by means of sub-stoichiometrically supplied air directly above the coal charge in an oven free space intended to serve this purpose, and wherein a combustion system for combustion of non-burned volatile coal constituents as well as gases generated during partial oxidation is arranged beneath the coke oven chamber, and wherein   the coke oven chamber in its side walls or in the coke cake or in the side walls and in the coke cake contains channels and wherein these channels connect the upper coke-free section of the coke oven chamber on the gas side with the combustion system beneath the coke oven chamber,   wherein   a negative pressure is generated through these channels in the oven free space above the coal cake, said negative pressure serving the purpose of aspirating the flue gases from the oven free space which evolve during the temporary coal charging or coke pushing procedure.   
     
     
         2 . Method for controlling the negative pressure in a coke oven chamber during the process of coke pushing and coal charging according to  claim 1 , wherein the procedure for generating the negative pressure starts 5 minutes prior to opening the doors and is terminated 30 minutes after closing the doors. 
     
     
         3 . Method for controlling the negative pressure in a coke oven chamber during the process of coke pushing and coal charging according to  claim 1 , wherein the negative pressure is generated in the combustion system beneath the coke oven chamber, with the coke oven chamber being located at the end side in the direction of suction, and that the negative pressure in the oven free space above the coke cake is aspirated through the channels. 
     
     
         4 . Method for controlling the negative pressure in a coke oven chamber during the process of coke pushing and coal charging according to  claim 1 , wherein the negative pressure in the combustion system is generated by a negative pressure-containing vacuum line arranged outside the coke oven chamber, the negative pressure being aspirated via a branch line in the oven free space above the coke cake via the channels. 
     
     
         5 . Method for controlling the negative pressure in a coke oven chamber during the process of coke pushing and coal charging according to  claim 1 , wherein the negative pressure is generated in the combustion system beneath the coke oven chamber by way of a blower, with the coke oven chamber being located at the end side in the direction of suction, said blower aspirating the negative pressure in the combustion system beneath the coke oven chamber via separate channels, and that the negative pressure is controlled by way of a regulating device. 
     
     
         6 . Method for controlling the negative pressure in a coke oven chamber during the process of coke pushing and coal charging according to  claim 1 , wherein the negative pressure in the combustion system beneath the coke oven chamber is thus generated by a vacuum receiver tank which is linked to the secondary heating space via a lockable secondary channel which is shortly connected to the secondary heating space for the process of suction so that a negative pressure in the oven free space above the coke cake is aspirated via the channels, said coke oven chamber being arranged at the end side in the direction of suction. 
     
     
         7 . Device for generating a negative pressure in a coke oven chamber during the process of coke pushing and coal charging, said device comprised of:
 a coke oven chamber that can be charged with a coke cake destined for carbonization, there being an oven free space above the coke cake in which the coal destined for carbonization is warmed-up after charging, and wherein   the side walls or the coke cake or the side walls and the coke cake accommodate channels which are suitable for aspirating a negative pressure, and wherein   a combustion system for combustion of non-burned volatile coal constituents as well as gases generated on partial oxidation is arranged beneath the coke oven chamber, and wherein   the coke oven chamber in its side walls or in the coke cake or in the side walls and in the coke cake contains channels and wherein these channels connect the upper coke-free section of the coke oven chamber on the gas side with the combustion system beneath the coke oven chamber,   wherein   the combustion system beneath the coke oven chamber is equipped with outward-leading secondary channels through which the combustion system can be charged with a negative pressure, so that   the oven free space above the coke cake can be charged with a negative pressure via the combustion system and the channels, and wherein   at least one of the outward-leading secondary channels is equipped with a regulating device.   
     
     
         8 . Device for controlling a negative pressure in a coke oven chamber during the process of coke pushing and coal charging according to  claim 7 , wherein the regulating device is a slide gate. 
     
     
         9 . Device for controlling a negative pressure in a coke oven chamber during the process of coke pushing and coal charging according to  claim 7 , wherein the regulating device is a spindle. 
     
     
         10 . Device for controlling a negative pressure in a coke oven chamber during the process of coke pushing and coal charging according to  claim 7 , wherein the regulating device is a flap.