Transactions . the bed can be maintained whenbadly clinkering coals are used is a point not as yet well proved. Themanufacturers statement that a gas-making fire must not be disturbed is at least open to question on some western slacks. Water jacketingof the body has been introduced in American practice. Note should be made of the tendency of producer manufacturersabroad to build producers capable of handling very low-grade fuelscarrying over 30 per cent. ash. It was reported, by the Bm-eau ofMines who went over the situation in 1914-15, that, although theselower grade fuels could be worked.,
Transactions . the bed can be maintained whenbadly clinkering coals are used is a point not as yet well proved. Themanufacturers statement that a gas-making fire must not be disturbed is at least open to question on some western slacks. Water jacketingof the body has been introduced in American practice. Note should be made of the tendency of producer manufacturersabroad to build producers capable of handling very low-grade fuelscarrying over 30 per cent. ash. It was reported, by the Bm-eau ofMines who went over the situation in 1914-15, that, although theselower grade fuels could be worked., many plants preferred to pay a higher G. S. BROOKS AND C. C, NITCHIE 897 price for a fair grade of material. Undoubtedly we may look to thosecountries where good coals are becoming yearly more scarce, for sub-stantial producer development on badly clinkering fuels. It will likelybe some time before western plants are obliged to consider any suchhigh-ash coals. However, when some of the beds on the northern edge. tlV/f Fig. 34.—Section of Pintsch revolving eccentric-grate gas producer. of the IlHnois basin, for instance, are used, either preUminary washing ora change in producer practice will be necessary. The two changes in producer construction that have done the mostto allow these clinkering coals to be handled are: Water jackets in thewalls around the hot zone and revolving eccentric grates. In the first feature, lower fuel efficiencies may result from a hightransfer of heat at the jacket surface. However, this may well off-set VOL. Lxni.—57. 898 GAS-PRODUCER PRACTICE AT WESTERN ZINC PLANTS the disadvantage of a very wet blow, which would be required to make theclinker workable. Furthermore, high efficiencies are not probable onthis class of material. The second change, in respect to the agitation of the bed, is to bringthe grinding action into play well toward the bottom of the should be more positive than the shearing zone of the Chapman and
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
