Patent GB-190311750-A (GB)
Title: Method of and Apparatus for Purifying Coal Gas so as to Prevent Loss of Illuminants during the Operation.
Inventor: HOLMES EDWARD DARTFORD
Filed: 1903-05-22
Granted: 1903-08-20
Abstract: 11,750. Holmes, E. D., [Guldlin, O. N.]. May 22. Purifying gas; condensers. -Relates to a process and apparatus for extracting tar, ammoniacal liquor, and other byeproducts from coal gas without loss of volatile illuminating- constituents by absorption in the tar. The tar is first extracted by condensation and dry mechanical impact or precipitation at 90‹-120‹ F., and the ammonia compounds are extracted at about 60‹ F. The gas passes from the hydraulic main 2 through a primary tubular condenser 4, an exhauster 11, a mechanical tar extractor 12, a secondary tubular condenser 14, an ordinary multitubular water condenser 16, a washer 31, scrubbers 33, 34, and a purifier, not shown. The condensers are set upon stone or concrete foundations 30. The condensers 4, 14 comprise, respectively, upper and lower tube sheets or heads 5, 6 and 5<a>, 6<a>, vertical air and water tubes 7, inlet and outlet chambers 4<d>, 4<c> and 14<c>, 14<a>, baffle-plates 4<a>, and a hood and stack with a damper 9 or valve 10 operated by rods 10<c>. Air inlets 4@, 14<b>, controlled. by slides 4<e>, 14<e>, communicate with air tunnels 8, 8<a> formed in the foundations 30 and leading, preferably, outside the building. The upper sheets 5, 5<a> are secured below the tube ends, to form shallow water receptacles. The cold-water supply pipe 18 is connected to the chamber 16<a> of the condenser 16, and the outlet pipe 19 is connected to the chamber 16<b> and, by branch pipes 20, 19<a> and valves 21, 22, respectively, with the chambers 14<a>, 14<c>. An overflow pipe 23 is connected to the chamber 14<a> and, by branch pipes 24, 23<a> and valves 25, 26, respectively, with the chambers 4<c>, 4<d>. An overflow pipe 27 for hot water is connected to the chamber 4<c> and provided with a valve 28 and leads to a storage tank. The condensers 4, 14 may be cooled by the external air during a large part of the year, but both air and water may be used, or, as shown in Fig. 2, water only. The extractor 12 is, preferably, of the Pelouze & Andouin type, in which the tar is separated from the gas by impact in small streams against plane surfaces or plates. Rotary scrubbers of the kind described in Specification No. 7364, A.D. 1902, may be used instead of tower scrubbers. A separator tank 43 is connected with the main 2 by a tar pipe 2<a>, with the condenser 4 by a drain pipe 47, with a drain pot or tank 38 by a pipe 44, and with a separator tank 42, or directly to a tar well, by a pipe 45. The washer 31 is connected with the scrubber 33 by an overflow trap pipe 33<a>, and with the tank 38 by overflow pipe. The scrubbers 33, 34 are connected with a drain pot 37 communicating with the tank 38, and an ammoniawater pump 40 is connected with the tank 38 and the scrubber 33. The tanks 38, 42 are connected by a pipe 46. Sprinkling cr spraying devices may be arranged at the tops of the tubes 7. Water pits may be constructed in the air-inlet chambers of the foundations 30, for cooling the air. Where hollow foundations 30 cannot be constructed, the air inlets may be located on the sides of the chambers 4<a>, 14<c>, and, preferably, in the form of manholes with covers. The dampers and watersupply valves may be controlled by ordinary thermostat devices.