Modern Gasworks Practice

THE PRELIMINARY PURIFICATION OF COAL GAS 509 To-day, the washer introducing the principis of wire-drawing and bubbling has come into very general use, for not only is such apparatus efficient from the point of view of the removal of the gaseous impurities, but it provides an admirable means of eliminating tar where this may have travelled forward to the wet plant. There are numerous types of this style of washer, but probably the most noteworthy is that designed by the late Sir George Livesey, and employed extensively throughout Fig. 312.— The Livesey Washer. the world. The apparatus is shown in Fig. 312. It consists of a rectangular cast-iron outer case, the upper portion of which forms an inlet chamber. To the lower flanges of the inlet chamber is fastened a series of wrought-iron pear-shaped tubes, an enlarged section of which is shown in Fig. 313. It will be noticed that whereas the space between tlicse tubes is in. communication with the inlet chamber, the interior of the tubes is coimected with the outlet chamber. Thus the gas has free access to the intermediate spaces, passes downwards through them, and depresses