Coking drum

Abstract

Coking drum 3, 4, especially for the manufacture of petroleum coke, which has an approximately cylindrical basic body, at least one inlet and at least two outlets, wherein there is arranged as shut-off member ( 11 ) at least at one outlet and/or at the or one inlet, a bridging pipe slide valve having two shut-off plates 27, 28.

1 . Coking drum, especially for the manufacture of petroleum coke, which has an approximately cylindrical basic body, at least one inlet and at least one outlet and a further access opening, 
 wherein there is arranged as shut-off member, at the outlet and/or at or near to the inlet and/or at the access opening, a bridging pipe slide valve having two shut-off plates.    
   
   
       2 . Coking drum according to  claim 1 , 
 in which associated with the two shut-off plates are wholly metallic sealing seats which are parallel to each other.    
   
   
       3 . Coking drum according to  claim 1 , 
 in which the sealing seat faces associated with the sealing scats have a wear-resistant and corrosion-resistant hard-armouring.    
   
   
       4 . Coking drum according to  claim 1 , 
 in which the two shut-off plates are movably mounted in a spectacle-shaped plate box.    
   
   
       5 . Coking drum according to  claim 1 , 
 in which a bridging pipe which, when the bridging pipe slide valve is in an open position, connects to each other two pipe sockets, which are arranged at the side of the bridging pipe slide valve facing the interior of the coking drum and at the opposite side thereto, is formed as a hollow cylinder, especially a circular cylinder, having a smooth surface.    
   
   
       6 . Coking drum according to  claim 1 , 
 in which the bridging pipe has a wear-resistant and corrosion-resistant hard-armouring or coating on its inner face, or is hardened.    
   
   
       7 . Coking drum according to  claim 1 , 
 in which the shut-off plates are, in the closed position, pressed against sealing faces by wedge members, which are centred by means of a cone.    
   
   
       8 . Coking drum according to  claim 1 , 
 in which a slide valve associated with the shut-off plates is provided with guide plates which are in permanent metallic contact with the plate box.    
   
   
       9 . Coking drum according to  claim 1 , 
 in which a control rod associated with the shut-off plates is inserted fluid-tight into the slide valve housing and that in the case of at least one bridging pipe slide valve there is provided on the slide valve housing a connection for connecting to a pressurised gas source, especially a flushing or shut-off steam source, by way of which the pressurised gas is provided for flushing or for additional sealing of the slide valve housing.    
   
   
       10 . Coking dry according to  claim 1 , 
 in which hoods having a columnar cup for receiving a drive are flange-mounted on the slide valve housing.    
   
   
       11 . Coking drum according to  claim 1 , 
 in which the bridging pipe slide valve has a compensator which compensates for gaps and for alignment inaccuracies when the bridging pipe slide valve is in an open position.    
   
   
       12 . Coking drum according to  claim 11 , 
 in which the compensator comprises a wavelike-curved pipe portion having a concavity extending over the circumference, the wavelike-curved pipe portion as outer pipe portion, extending coaxially above an inner pipe portion, which is joined in fixed manner to only one of the two sealing rings whilst being axially movable in relation to the other sealing ring.    
   
   
       13 . Coking process, especially for coking residues from the vacuum distillation of crude oil, 
 in which the material to be coked is heated in a furnace and is fed to a coking drum in which the actual coking operation takes place.    in which in the coking drum there is used as a shut-off member at least one bridging pipe slide valve having two shut-off plates.    
   
   
       14 . Coking process according to  claim 13 , 
 in which, for additional sealing of the coking drum, at least one bridging pipe slide valve is acted on by pressurised gas, especially flushing or shut-off steam.    
   
   
       15 . Coking process according to  claim 13 , 
 in which there is established in the interior of a slide valve housing, especially when the shut-off plates are in a closed position, a gas pressure that is greater than the pressure prevailing in the coking drum.    
   
   
       16 . Coking process according to  claim 13 , 
 in which, when the or each bridging pipe slide valve is being opened, use is made of the pressure prevailing inside the coking drum to push the shut-off plate facing the interior away from the valve scat, and consequently the force required to open the shut-off member is reduced.