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Title: 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]

Abstract

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/supmore » 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.« less

Authors:
Publication Date:
Research Org.:
Wormser Engineering, Inc., Middleton, MA (USA)
OSTI Identifier:
5530739
Report Number(s):
DOE/MC/10484-T1
DOE Contract Number:  
ET-78-C-01-2859
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 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; THERMOCHEMICAL PROCESSES; 014000* - Coal, Lignite, & Peat- Combustion; 421000 - Engineering- Combustion Systems; 010406 - Coal & Coal Products- Pyrolysis & Cracking- (-1987)

Citation Formats

Dawson, W F. 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]. United States: N. p., 1980. Web.
Dawson, W F. 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]. United States.
Dawson, W F. Tue . "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]". United States.
@article{osti_5530739,
title = {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]},
author = {Dawson, W F},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5530739}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

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