Patent GB-434393-A (GB)
Title: Improvements in and relating to the production of carbon-black
IPC: C09C1/52
Filed: 1935-01-15
Abstract: <PICT:0434393/III/1> <PICT:0434393/III/2> In an apparatus for the continuous production of carbon black by the incomplete combustion of carbonaceous materials and deposition on a cooled surface, the materials are burnt in a multi-flame flat burner having parallel rows of flames arranged below a grate-shaped cooler consisting of parallel tubes traversed by a cooling medium, the grate being approximately double the length of the burner and being moved to and fro with controllable pauses, during which it remains stationary with one of its two halves alternately above the burner.  Collecting vessels 2 are arranged at each end of frame 1, the upper openings of each occupying one third of the length of the upper surface of the frame, and above them transverse brushes 3 are arranged.  Between the inner edges of the collecting vessels is arranged a horizontal flat burner 4 consisting of parallel tubes 5 branching off symmetrically from a feed pipe 6, and having a large number of burner openings distributed in longitudinal rows 7 (see Fig. 2).  The ends of the burner tubes are flattened and are held between the side bars of the burner frame by corrugated sheet metal insertions, which allow them to expand longitudinally while retaining their relative positions.  The feed pipe 6, having expansion members 11, leads to a container 12 for the raw material, e.g. naphthalene, which is heated by a burner 15. Pipes 16 and 17 are provided to supply air or an incombustible gas, and a combustible gas, preferably rich in carbon, such as illuminating gas.  The pipe 6 may be heated if desired by a burner 18.  The container 12 is movable along a guide 19 so that it can be raised or lowered without altering its vertical position.  The cooler frame 24 is two-thirds the length of the frame 1 and travels along it on rails 20.  The cooling tubes 31 are in the form of triangular prisms having upper stiffening ribs 30, and are secured in similarly shaped recesses in the crossbars 25 of the frame 24.  The securing bolts are arranged to permit longitudinal expansion and contraction of the tubes.  The tubes are arranged immediately above the rows 7 of burner holes.  S-shaped expansion members 32 are welded on both ends of the tubes 31 and open into transverse distributing tubes 33 by which water is circulated via pipes 34.  A partition wall 35 is inserted opposite the inlets of the middle tubes 32 to promote even circulation.  The cooler is moved to and from one end of frame 1 to the other by means of rack-and-pinion reversing gear 36 and motor 37, and is arranged to stop alternately with one of its half-lengths above the burner 4 for a definite period.  On movement of the frame, the carbon deposited during that period is brushed into collectors 2. The size of the flames is controlled by the pressure of air or other gas forced into the container 12, and also by the distance of the container from the burner frame. The spaces between the cooler tubes are so arranged that air has free passage to and from the burners without disturbing the deposited carbon.  The atmospheric air reaching the burners may be preheated if desired and it may also be controlled by a suction hood arranged above the burners.  A machine fitted with 1000 flames of 0,5 mm. diameter can treat 4 kgm. of commercial naphthalene per hour of continuous work and produce 2 kgm. of carbon black.