Multi-stage desulfurizing fluid-bed combustor for coal-fired hot gas generator systems. Topical report No. 2. Task 3. Burner-pyrolyzer interactions. Task 4. Pollution measurement. [COHOGG - Coal Hot Gas Generator; US Patent 4,051,791]
COHOGG is a Coal Hot Gas Generator designed to allow the replacement of an oil or gas burner with an environmentally acceptable coal burner. Fluid bed coal combustors cannot provide high enough temperatures for process burners or high temperature boilers because of the limiting temperatures for clinkering (approx. 2000/sup 0/F) and sulfur dioxide absorption (approx. 1600/sup 0/F). Wormser Engineering, Inc. is developing a unique line of coal FBC's known as Wormser Grates which have several notable advantages over the typical FBC. If a partially gasifying pyrolyzer is added to a Wormser Grate system, it is possible to generate high temperature, environmentally clean flame and therefore substitute for a gas or oil burner. Coal is fed to a pyrolyzer with a low percentage of stoichiometric air to provide the heat of pyrolysis and partially gasify the coal. The resultant gases are fed to an afterburner and the char is fed to a Wormser Grate, where it is burned with excess air to maintain the bed temperatures at the optima for combustion efficiency and SO/sub 2/ clean-up. The char burner combustion products with the excess air are fed to the afterburner where they burn the pyrolyzer gases to produce the approx. 3000/sup 0/F flame. The COHOGG system is highly efficient and low in cost. The high efficiency results from (a) no in-process gas clean-up requiring a large loss of sensible heat, and (b) high carbon utilization because only partial gasification occurs in the pyrolyzer and the upper bed in the Wormser Grate provides additional fines burn-up. The capital cost is low since the reactor sizes are similar to other gasification systems.
- Research Organization:
- Wormser Engineering, Inc., Middleton, MA (USA)
- DOE Contract Number:
- ET-78-C-01-2859
- OSTI ID:
- 5530739
- Report Number(s):
- DOE/MC/10484-T1
- Country of Publication:
- United States
- Language:
- English
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Multi-stage desulfurizing fluid-bed combustor for coal-fired hot gas generator systems: Topical report No. 3. Task 6. Modifications to Materials Handling Equipment. Task 7. Testing
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42 ENGINEERING
BOILERS
FUEL SUBSTITUTION
COAL
FLUIDIZED-BED COMBUSTION
PYROLYSIS
CHARS
FOSSIL-FUEL POWER PLANTS
RETROFITTING
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMBUSTION
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
OXIDATION
POWER PLANTS
PYROLYSIS PRODUCTS
THERMAL POWER PLANTS
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