Intensification of napthalene removal from coke-oven gas in the primary gas coolers
The coke-oven gas entering the primary coolers usually contains 9 to 11 g/m/sup 3/ of naphthalene; it leaves the coolers with 2 to 4 g/m/sup 3/, depending on the degree of cooling. In other words, most of the naphthalene in coke-oven gas is recovered during primary cooling, and very serious attention should be paid to making the coolers more efficient in the sense of minimizing the residual naphthalene content of the coke-oven gas. The current method of minimizing the residual naphthalene content of coke-oven gas is to lower the temperature at which it leaves the primary coolers. The equilibrium naphthalene content falls from 3.48 g/m/sup 3/ at 40/sup 0/C to only 1.29 g/m/sup 3/ at 30/sup 0/C. Naphthalene removal at gas temperatures below 50 to 52/sup 0/C is brought about by direct deposition on the heat transfer surfaces in the coolers, which seriously lowers their performance. Continuous irrigation of the gas spaces in primary gas coolers, using coal tar, is a more effective method of keeping the naphthalene content of the cooled coke-oven gas at a low level. Continuous tar irrigation does more than keeping the naphthalene content of the cooled gas down; it eliminates the problem of organizing perodic shutdowns for naphthalene deposit removal and it reduces the volume of effluent by eliminating the use of steam for purging purposes. The selection of the best irrigating medium has been invesigated by studying the equilibrium conditions in the system comprising naphthalene in the medium and naphthalene in the vapors over the medium.
- OSTI ID:
- 5823461
- Journal Information:
- Coke Chem., USSR (Engl. Transl.); (United States), Journal Name: Coke Chem., USSR (Engl. Transl.); (United States) Vol. 8; ISSN COKCA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Performance study on primary gas coolers with horizontal tubes
Efficient cooling of gas in coke battery gas mains
Related Subjects
010401* -- Coal & Coal Products-- Carbonization-- (-1987)
AMMONIA
AROMATICS
CLEANING
COAL GAS
COAL TAR
CONDENSED AROMATICS
COOLING
EQUILIBRIUM
EUROPE
FLUIDS
GASES
HEAT EXCHANGERS
HYDRIDES
HYDROCARBONS
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
NAPHTHALENE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PARTITION
PURIFICATION
REMOVAL
SPRAYS
TAR
TEMPERATURE DEPENDENCE
USSR