GB625879A - Improvements in or relating to gas-fired coke ovens or retorts - Google Patents

Abstract

625,879. Coke ovens. HEAT EXCHANGERS, Ltd., MELHUISH, H., and RUDORFF, D. W. A. F. March 6, 1947, No. 6331. [Class 51 (ii)] [Also in Group XIII] A gas fired coke oven installation comprises a battery of coking chambers or ovens disposed between rows of firing flues, a direct contact regenerative heater or heaters for air, or air and lean gas, constructed as a separate unit or units and operating to supply air, or air and lean gas, at a constant or substantially constant temperature or temperatures, and between the firing flues and the heat transfer regions of the heater or heaters supply and delivery passages or ducts individual throughout their length to air, or air and lean gas, and waste gases respectively. A group of heaters arranged in parallel may be provided common to a number of batteries of ovens, each group comprising at least one heater in excess of normal requirements andnormally out of service. In one form, Fig. 2, nozzles 5 in the intake ends of the flow portions 2 of the firing flues are connected by pipes 6 to distributing pipes 7 connected to a main supply duct 8 for rich gas. Preheated air is supplied from a duct 11 via pipes 10 and 9, and the combustion products from the return positions 3 of the flues are delivered through pipes 12 and 13 to the main waste gas duct 14. Dampers, not shown, may be provided for regulating the supply of air and gas to individual flues. The regenerator comprises an upper heated chamber 17 having an outlet 19 and a connection 18 to the duct 14, and a lower heating chamber 20 having an air inlet 22 and a connection 23 to the duct 11, the regenerative material being fed into the chamber 17 and falling by gravity into the chamber 20 from which it is returned by a conveyer 21. In a second form, Fig. 3, there are two lower heating chambers 20, 24, the feed to which is controlled by valves 25, 26. Both chambers may be used to preheat air or gas, or the chamber 20 may be used to preheat air, as in Fig. 2, and the chamber 24 to preheat lean gas which enters through a pipe 27 and leaves through a pipe 28 connected to the duct 8. In order that both chambers may preheat the same fluid and supply it to the duct 11 or 8, valve-controlled cross pipes may be provided for connecting together the pipes 22, 27 and 23, 28. The regenerator may comprise a number of upper heated chambers from which the regenerative material is fed to a common duct leading to a number of heating chambers. One or more of the upper chambers may be cut out of service as desired. Alternatively, each heating chamber may have an upper heated chamber individual thereto, and means may be provided for regulating the supply of combustion products to each upper chamber. Fig. 4 shows a regenerator similar to that described in Specification 618,632, [Group XIII], which comprises a horizontally-disposed tunnel in which regenerative material is circulated by impellers 30, the heated portion 170 being separated from the heating portion 200 by restrictions 29. The tunnel may be bifurcated for a portion of its length to provide two heating chambers and the arrangement may be such that equal or unequal and variable amounts of regenerative material are fed through the two limbs. Valvecontrolled cross ducts may connect the two chambers. The pipes 7, 10 and 13 may be arranged longitudinally or transversely of the coking chambers and together with the mains 8, 11 and 14 may be disposed in a tunnel under the platforms 15 supporting the battery of ovens. The regenerator or regenerators may be arranged at the sides of the battery or in the tunnel.