Coke-oven charges

Coke oven charging Hydrocarbons, carbon, coal dust Aspiration systems to draw pollutants into oven, venturi scrubbers... 

Partial briquetting of coke oven charges The essential difference between the partial briquetting of coke oven charges and the formed coke processes is the densification of only part of the coke oven feed by briquetting. The briquettes are subsequently mixed with loose coal and charged into conventional (slot-type) coke ovens (Figure 410). 

J. T. Price, J. F. Gransden, and W. R. Leeder, Canadian R D studies of partially briquetted coke oven charges , CANMET Report 82-8E, 1981. 

Parallel to the efforts to develop a process in which formed coke is produced as a new commodity, the partial briquetting of coke oven charges was introduced (Fig. 6.10-31). 

Ferrous metal processing Coke by-product plants Coke ovens—charging, top side, and door leaks 11/15/00 12/31/92 (To be deUsted) 12/04/92 10/27/93 L Various... 

In the CIS pitch coke is made by carbonizing a hard coke-oven pitch in modified coke ovens. The hard pitch has an R-and-B softening point of 140—150°C and is made by air-blowing a mixture of medium-soft pitch and recycled coking oils. This feedstock is charged in the molten state over a period of 5 h and coked for 17—18 h at 1250—1300°C. The coke yield is 70%. Oils, which are recycled, amount to 20% by weight of the pitch fed. The gas yield... 

Fig. 4. Parameters in a coking cycle where (—) represents coke oven wall pressure ( ) coal charge center temperature (—) coke mass lateral contraction ...

Coke plants By-product-ovens charging Smoke, particulates (dust) Pipe-line charging, careful charging techniques, portable hooding and scrubber or baghouses... 

Steel mills Blast furnaces charging, pouring CO, fumes, smoke, particulates (dust) Good maintenance, seal leaks use of higher ratio of pelletized or sintered ore CO burned in waste-heat boilers, stoves, or coke ovens cyclone, scrubber, and baghouse... 

Coal-based pitches are predommantly byproducts of metallurgical coke operations in recovery-type coke ovens. The volatile products from the coke oven are recovered and processed, in simplest terms, into gas, light oils, and tar. The quantity and character of the materials are influenced by the type of coal charge, the design of the cokmg equipment, and the temperature and time profile of carboni2ation. Table 1 shows a typical yield of products from the... 

Thermal conductivity and heat capacity In practical applications, refractory materials processing high thermal capacity as well as low thermal conductivity are required, depending upon (of course) the functional requirements. In most situations, a refractory that serves as a furnace wall should have a low thermal conductivity in order to retain as much as heat as possible. However, a refractory used in the construction of the walls of muffles or retorts or coke ovens should have a high thermal conductivity in order to transmit as much heat as possible to the interior. The charge remains separated from flame in these specific examples of installations. 

Estimates also were made for 65 coke plants in 12 states. Coke ovens produce benzene as a by-product, but not all of it can be recovered. It has been estimated that benzene contributes about two-thirds of one percent of the coal gas generated. Potential points of emissions from one type of coke battery are illustrated in Figure 7. Emissions from coke ovens were derived from estimated emission factors (based on coke oven product assays and benzene yields) and coal charging rates. 

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