Partial oxidation of sewage sludge
A process is described comprising: (1) splitting a stream of dewatered sewage sludge having a solids content in the range of about 17-40 wt.% into a first stream and a second stream; (2) drying the first stream of dewatered sewage sludge to produce a stream of dried sewage sludge having a solids content in the range of about 75-99 wt.%: (3) grinding the dried sewage sludge from (2) to a particle size so that 100 wt% passes through ASTM E11 Standard Sieve Designation 1.40 mm; (4) mixing about 2-8 parts by dry weight aqueous slurry of solid carbonaceous fuel having a solids content of about 50-70 wt. % with each part by weight of said second stream of dewatered sewage sludge from (1); (5) heating the solid carbonaceous fuel-sewage slurry from (4) to a temperature of about 140-212 F; and mixing together 3-9 parts by dry weight of the solid carbonaceous fuel-sewage sludge slurry from (4) with each part by weight of dried sewage sludge from (2) to produce a pumpable fuel slurry comprising sewage sludge and solid carbonaceous fuel and having a solids content in the range of about 45-70 wt. %; and (6) reacting the fuel slurry from (5) in the reaction zone of a partial oxidation gas generator at a temperature in the range of about 1800-3500 F and a pressure in the range of about 1-35 atmospheres, and in the presence of free-oxygen containing gas, thereby producing a hot raw effluent gas stream of synthesis gas, reducing gas or fuel gas; (7) cooling, cleaning and purifying said raw effluent gas stream to produce a stream of fuel gas; (8) burning the fuel gas from (7) with air in a combustor of a gas turbine, and passing the hot exhaust gas through an expansion turbine which drives an electric generator; and (9) passing the hot exhaust gas from (8) in indirect heat exchange with water to produce steam for use in drying said first stream of dewatered sewage sludge in (2) and/or for heating said solid carbonaceous fuel-sewage slurry is (5) by indirect heat exchange.
- Assignee:
- Texaco Inc., White Plains, NY (United States)
- Patent Number(s):
- US 5230211; A
- Application Number:
- PPN: US 7-685338
- OSTI ID:
- 6156313
- Resource Relation:
- Patent File Date: 15 Apr 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CARBONACEOUS MATERIALS
COPROCESSING
GASIFICATION
DUAL-PURPOSE POWER PLANTS
DESIGN
FUEL GAS
COMBUSTION
SYNTHESIS
SEWAGE SLUDGE
COGENERATION
COMMINUTION
DRYING
FUEL SLURRIES
FUEL SUPPLIES
GAS TURBINES
HEAT EXCHANGERS
OXIDATION
PARTICLE SIZE
REFUSE-FUELED POWER PLANTS
WATER REMOVAL
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
CHEMICAL REACTIONS
DEUS
DISPERSIONS
ENERGY SUPPLIES
ENERGY SYSTEMS
EQUIPMENT
FLUIDS
FUELS
GAS FUELS
GASES
MACHINERY
MATERIALS
MIXTURES
POWER GENERATION
POWER PLANTS
PROCESSING
REMOVAL
SEWAGE
SIZE
SLUDGES
SLURRIES
STEAM GENERATION
SUSPENSIONS
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
TURBINES
TURBOMACHINERY
WASTES
090900* - Biomass Fuels- Processing- (1990-)
092000 - Biomass Fuels- Combustion- (1990-)
320304 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Waste Heat Recovery & Utilization