초록 ▼

Municipal sanitary sewage sludge is disposed of by an improved partial oxidation process without polluting the environment. Aqueous slurries of sewage sludge are upgraded by being sheared without heating, concentrated if necessary, and then mixed with a supplemental fuel, preferably coal. In one emb

Municipal sanitary sewage sludge is disposed of by an improved partial oxidation process without polluting the environment. Aqueous slurries of sewage sludge are upgraded by being sheared without heating, concentrated if necessary, and then mixed with a supplemental fuel, preferably coal. In one embodiment, the aqueous slurry of sewage sludge and the supplemental coal and/or petroleum coke are introduced into a shearing mixer for simultaneous shearing and mixing together. A pumpable aqueous slurry of sewage sludge-coal and/or petroleum coke is thereby produced having an increased amount of total solids and an increased heat content (HHV) as well as containing an increased amount of sewage sludge for reacting with free-oxygen containing gas in a free-flow partial oxidation gas generator. Hot quench water or steam produced by cooling the hot raw effluent stream of synthesis gas, reducing gas or fuel gas from the gasifier may provide heat for indirect heat exchange with other streams in the process.

대표청구항 ▼

A process for the partial oxidation of sewage sludge comprising: (1) shearing without heating a concentrated aqueous slurry of sewage sludge obtained from sewage and comprising combustible and non-combustible materials and having a solids content of at least 3 wt.%, at a shear rate of at least 3400

A process for the partial oxidation of sewage sludge comprising: (1) shearing without heating a concentrated aqueous slurry of sewage sludge obtained from sewage and comprising combustible and non-combustible materials and having a solids content of at least 3 wt.%, at a shear rate of at least 3400 per minute for a period in the range of about 5 to 180 minutes to produce a pumpable aqueous slurry of sewage sludge; (2) dewatering the sheared pumpable aqueous slurry of sewage sludge from (1) to a solids content in the range of about 25 to 50 wt. %; (3) mixing the pumpable sheared aqueous slurry of sewage sludge from (2) having a higher heating value (HHV) of at least 3,000 Btu/lb (dry basis) with a supplemental solid fuel comprising particles of coal and/or petroleum coke having a higher heating value (HHV) of at least about 8,000 Btu/lb (dry basis) to produce a pumpable aqueous sewage sludge-coal and/or petroleum coke slurry having a solids content in the range of about 30 to 65 wt. %, and having a higher heating value (HHV) of at least about 6,000 Btu/lb (dry basis); and (4) reacting said pumpable aqueous sewage sludge-coal and/or petroleum coke slurry from (3) in the reaction zone of a partial oxidation gas generator at a temperature in the range of about 1800°F. to 2800°F. and a pressure in the range of about 1-35 atmospheres, and in the presence of a free-oxygen containing gas, thereby producing a hot raw effluent stream of synthesis gas, reducing gas or fuel gas.