Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1973-12-19
1976-03-30
Dority, Jr., Carroll B.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 27, 34 28, 34 35, 34 73, 34166, 34169, 34182, F26B 504
Patent
active
039464954
ABSTRACT:
Method and apparatus are described for the production of solid fuel and steam by drying moisture-containing solids, such as refuse and sludge cakes, in a multi-stage heating zone by using the moisture-containing solids as the feed-water in a direct contact countercurrent flow pressurized boiler. After vaporizing the bulk of the moisture in the heating zone of the boiler, the solid residue is further dried in a multi-stage flashing zone. From the upper end of the heating zone is removed a nearly saturated steam including the water vapor evaporated from the moisture-contained solids by the heat of cooling of the introduced superheated steam. A portion of the removed steam equal to the vaporized moisture is heated and then directed to a turbine, generating all the power required to operate the system. The bulk of the removed steam equal to the introduced superheated steam is compressed, reheated and recycled through the heating zone. The dried solid is removed at the lower end of the flashing zone and is incinerated, and the recovered heat is utilized to supply the heat required for said drying, and to produce saturated steam for heating purposes, or superheated steam for power generation.
In the latter case the heat of condensation of the turbine exhaust steam is utilized advantageously as a heat source in a distillation plant for fresh water production.
REFERENCES:
patent: 1408456 (1922-03-01), Harrison
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patent: 2062025 (1936-11-01), Harrington
patent: 2254867 (1941-09-01), Bonotto
patent: 3205664 (1965-09-01), Nettel
patent: 3325912 (1967-06-01), Bojner et al.
patent: 3438202 (1969-04-01), Roe
patent: 3564723 (1971-02-01), Passey et al.
Barish Benjamin J.
Dority Jr. Carroll B.
Schwartz Larry I.
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