Process for combustion of sulfur-containing carbonaceous materials
First Claim
1. A process for burning a combustible, sulfur-containing carbonaceous material, while reducing the formation of noxious materials exhausted to the atmosphere comprising introducing said carbonaceous material, oxygen and marble having a particle size in the range of from about 300 sieve up to about 4 sieve into a combustion zone, said marble being introduced at a feed rate in a stoichiometric ratio of CaO to S in a range of from about 1.0 to about 2.0 to 1.0, maintaining a temperature sufficient to ignite said oxygen and said carbonaceous material in said combustion zone and forming solid by-products of combustion and retarding and reducing simultaneously the formation of SOx and NOx, wherein at least 75% of SOx emission is removed and wherein NOx emission are more than 50% below the NOx emissions using limestone and reducing carbon in said solid by-products to a range of from about 20% up to about 50% by weight of the carbon content using limestone, based on the weight of said solid by-products, including carbon, and exhausting the gaseous by-products of combustion.
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Abstract
In a process for burning a combustible, sulfur-containing carbonaceous material such as coal, municipal waste, or tires, recrystallized metamorphic CaCO3 is introduced into the combustion zone along with the fuel. The amount of SO2 and NO2 generated is substantially reduced as compared to conventional processes and, even with no post-scrubbing equipment, the emission levels compare favorably to the emission levels of state-of-the-art power plants using the same coal with extensive emission controls. The present process also acts to convert sulfur resident in coal into elemental sulfur and loose sulfur compounds and to reduce the particulate output.
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12 Claims
- 1. A process for burning a combustible, sulfur-containing carbonaceous material, while reducing the formation of noxious materials exhausted to the atmosphere comprising introducing said carbonaceous material, oxygen and marble having a particle size in the range of from about 300 sieve up to about 4 sieve into a combustion zone, said marble being introduced at a feed rate in a stoichiometric ratio of CaO to S in a range of from about 1.0 to about 2.0 to 1.0, maintaining a temperature sufficient to ignite said oxygen and said carbonaceous material in said combustion zone and forming solid by-products of combustion and retarding and reducing simultaneously the formation of SOx and NOx, wherein at least 75% of SOx emission is removed and wherein NOx emission are more than 50% below the NOx emissions using limestone and reducing carbon in said solid by-products to a range of from about 20% up to about 50% by weight of the carbon content using limestone, based on the weight of said solid by-products, including carbon, and exhausting the gaseous by-products of combustion.
Specification