Process of purifying exhaust gases produced by combustion of was

Details Process of purifying exhaust gases produced by combustion of was Process of purifying exhaust gases produced by combustion of was

1994-12-16

1996-11-19

Lewis, Michael

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

423240R, 42324308, B01D 5350, B01D 5364

Patent

active

055759823

ABSTRACT:
The process purifies exhaust gas produced by combustion of waste materials including garbage, industrial wastes and/or sewage sludge. The exhaust gas is contaminated particularly with dust, SO.sub.2, HCl, HF, Hg, mercury compounds, and dioxins and furans and can be expected to have an oxygen content. In the process, the exhaust gas is treated in a spray absorber with a suspension of Ca(OH).sub.2 ; the exhaust gas is subsequently filtered in two successive filteration stages; the exhaust gas leaving the first filtering stage still has an SO.sub.2 content of from 20 to 500 mg/sm.sup.3 ; activated carbon, preferably hearth furnace coke, is introduced into the exhaust gas stream before the second filtering stage; and the exhaust gas is finally scrubbed with a mixture which contains water and NaOH, Na.sub.2 CO.sub.3, Ca(OH).sub.2 and CaCO.sub.3 in a dissolved or suspended state.

REFERENCES:
patent: 4789532 (1988-12-01), Jons et al.
patent: 5238665 (1993-08-01), Lerner
patent: 5439508 (1995-08-01), Mayer-Schwinning

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