System for co-firing cleaned coal and beneficiated organic-carbon-containing feedstock in a coal combustion apparatus
First Claim
1. A co-firing system for combusting coal and processed biomass in a coal combusting apparatus with less adverse by-products, comprising:
- a first chamber of a coal combusting apparatus configured to pulverize a coal feedstock comprising a processed biomass/cleaned coal blended compact aggregate that comprises at least 10 wt % of a coal having a sulfur content of at least 50 wt % less than that of the content of sulfur in the coal before it passed through a coal cleaning sub-system and at least 10 wt % of a processed biomass from a processed biomass system and to feed the pulverized cleaned coal feedstock into the coal combusting apparatus in a first concentration of feedstock;
a second chamber of the coal combusting apparatus configured to pulverize a processed biomass pellet feedstock from the processed biomass system and to feed the pulverized processed biomass pellet feedstock into the coal combusting apparatus in a second concentration of feedstock with the weight ratio of the first concentration to the second concentration between 1 to 9 and 9 to 1,wherein the processed biomass system is configured to make processed biomass from unprocessed organic-carbon-containing feedstock that includes free water, intercellular water, intracellular water, intracellular water-soluble salts, and at least some plant cells comprising cell walls that include lignin, hemicellulose, and microfibrils within fibrils , the processed biomass system comprising;
a beneficiation sub-system configured to convert the unprocessed organic-carbon-containing feedstock into a processed organic-carbon-containing feedstock with characteristics that include having an energy density of at least 17 MMBTU/ton (20 GJ/MT), a water content of less than 20 wt %, and a water-soluble intracellular salt content that is decreased more than 60 wt % on a dry basis from that of the unprocessed organic-carbon-containing feedstock;
a coal cleaning sub-system configured to convert un-cleaned coal into cleaned coal having a sulfur content at least 50 wt % less than that of the content of sulfur in the un-cleaned coal before it passed through the coal cleaning sub-system;
a blending sub-system configured to convert the cleaned coal and some of the processed biomass into processed biomass/cleaned coal blended compact aggregate with a weight ratio of cleaned coal to processed biomass ranging from 1 to 9 to 9 to 1; and
a pelletizing sub-system configured to convert some of the processed organic-carbon-containing feedstock into processed biomass pellets.
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Abstract
A co-firing process is described using cleaned coal and processed biomass to reduce adverse by-products in a coal combusting apparatus. The coal feedstock comprises an aggregate blend of cleaned coal and processed biomass. The biomass feedstock comprises processed biomass pellets. The total energy density is predetermined and can be similar to the coal component or higher than the coal component. The intracellular salt in the processed biomass is at least 60 wt % less for the processed organic-carbon-containing feedstock used to make the processed biomass pellets than that of the starting un-processed processed organic-carbon-containing feedstock. The cleaned coal has a sulfur content that is 50 wt % less than that of un-cleaned coal before it passed through the coal-cleaning sub-system.
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Citations
20 Claims
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1. A co-firing system for combusting coal and processed biomass in a coal combusting apparatus with less adverse by-products, comprising:
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a first chamber of a coal combusting apparatus configured to pulverize a coal feedstock comprising a processed biomass/cleaned coal blended compact aggregate that comprises at least 10 wt % of a coal having a sulfur content of at least 50 wt % less than that of the content of sulfur in the coal before it passed through a coal cleaning sub-system and at least 10 wt % of a processed biomass from a processed biomass system and to feed the pulverized cleaned coal feedstock into the coal combusting apparatus in a first concentration of feedstock; a second chamber of the coal combusting apparatus configured to pulverize a processed biomass pellet feedstock from the processed biomass system and to feed the pulverized processed biomass pellet feedstock into the coal combusting apparatus in a second concentration of feedstock with the weight ratio of the first concentration to the second concentration between 1 to 9 and 9 to 1, wherein the processed biomass system is configured to make processed biomass from unprocessed organic-carbon-containing feedstock that includes free water, intercellular water, intracellular water, intracellular water-soluble salts, and at least some plant cells comprising cell walls that include lignin, hemicellulose, and microfibrils within fibrils , the processed biomass system comprising; a beneficiation sub-system configured to convert the unprocessed organic-carbon-containing feedstock into a processed organic-carbon-containing feedstock with characteristics that include having an energy density of at least 17 MMBTU/ton (20 GJ/MT), a water content of less than 20 wt %, and a water-soluble intracellular salt content that is decreased more than 60 wt % on a dry basis from that of the unprocessed organic-carbon-containing feedstock; a coal cleaning sub-system configured to convert un-cleaned coal into cleaned coal having a sulfur content at least 50 wt % less than that of the content of sulfur in the un-cleaned coal before it passed through the coal cleaning sub-system; a blending sub-system configured to convert the cleaned coal and some of the processed biomass into processed biomass/cleaned coal blended compact aggregate with a weight ratio of cleaned coal to processed biomass ranging from 1 to 9 to 9 to 1; and a pelletizing sub-system configured to convert some of the processed organic-carbon-containing feedstock into processed biomass pellets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 20)
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10. A process of co-firing coal and processed biomass for combusting coal in a coal combusting apparatus with less adverse by-products comprising:
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passing un-cleaned coal through a coal cleaning sub-system to form cleaned coal having a sulfur content that is at least 50 wt % less than that of the content of sulfur in an un-cleaned coal; and making a processed biomass feedstock pellet in a processed biomass system via a processed biomass system process that comprises; inputting into the processed biomass a system comprising a first and a second subsystem an unprocessed organic-carbon-containing feedstock that includes free water, intercellular water, intracellular water, intracellular water-soluble salts, and at least some plant cells comprising cell walls that include lignin, hemicellulose, and microfibrils within fibrils; passing unprocessed organic-carbon-containing feedstock through the first subsystem, a beneficiation sub-system via a beneficiation sub-system process, to result in processed organic-carbon-containing feedstock with characteristics that include having an energy density of at least 17 MMBTU/ton (20 GJ/MT), a water content of less than 20 wt %, and a water-soluble intracellular salt content that is decreased more than 60 wt % on a dry basis from that of the unprocessed organic-carbon-containing feedstock; and passing the processed organic-carbon-containing feedstock through the second subsystem, a pelletizing sub-system via a pelletizing sub-system process, to result in pelletized processed biomass pellet feedstock; passing the cleaned coal with part of the processed biomass through a blending sub-system via a blending sub-system process to form a processed biomass/cleaned coal blended compact aggregate that comprises the processed biomass/cleaned coal blended compact aggregate and the processed biomass in a wt ratio of between 1 to 9 and 9 to 1; providing the processed biomass/cleaned coal blended compact aggregate to a first chamber of the coal combusting apparatus, the first chamber configured to pulverize coal and feed the coal into the coal combusting apparatus in a first concentration weight of feedstock; and providing part of the processed biomass pellet feedstock to a second chamber of the coal combusting apparatus, the second chamber configured to pulverize the processed biomass and feed the processed biomass into the coal combusting apparatus in a second concentration weight of feedstock with the ratio of the first concentration weight to the second concentration weight is between 1 to 9 and 9 to 1. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification