Systems and Methods for Increasing Carbon Dioxide in Gasification
a carbon dioxide and gasification technology, applied in the field of gasification of carbonaceous materials, can solve the problems of large energy consumption during operation, and high cost of carbon dioxide converters, and achieve the effects of increasing the requirement of facility space, cost, and requiring plant resources
Inactive Publication Date: 2010-06-03
KELLOGG BROWN & ROOT LLC
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- Description
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Benefits of technology
The patent text describes a system and method for gasifying carbonaceous material by mixing it with water to create a slurried mixture. This mixture is then introduced into a gasifier where it is heated and converted to syngas. The gasifier system includes an oxidation zone and a gasification zone, which can be arranged in different configurations. The slurried mixture can be introduced to the gasifier without the need for additional equipment, such as lock hoppers or other solids introduction devices. The technical effect of this invention is to increase the carbon dioxide content of the gasified material, which can improve the efficiency and energy consumption of the gasification process.
Problems solved by technology
As such, carbon dioxide converters are expensive to operate and consume large amounts of energy during operation.
Furthermore, carbon dioxide converters add to facility space requirements, costs, and require plant resources.
Method used
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[0073]Embodiments of the present invention can be further described with reference to the following simulated examples. Table 1 summarizes the basic process conditions for various fees: a dry feed, i.e. no water added to the carbonaceous material; a 55% wt; a 62% wt; and a 70% wt carbonaceous material slurried with water, where water constitutes the balance of the mixture. Tables 2 and 3 illustrate the increase in CO2 and the decrease in CO as the water content is increased relative to a non-slurried process using air as the oxidant (Table 1) and oxygen as the oxidant (Table 2), according to one or more embodiments described above with reference to FIGS. 1-4.
TABLE 1Process Conditions70% wt62% wt55% wtCarbo-Carbo-Carbo-naceousnaceousnaceousDry FeedmaterialmaterialmaterialAir / Coal Ratio2.863.103.223.36Gasifier Temp ° C.982982982982Gasifier Pressure kPa3,6003,6003,6003,600HP Steam1.001.221.321.43
[0074]As shown in Table 1, the temperature of the gasifier is maintained at 982° C. and the...
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Abstract
Systems and methods for processing carbonaceous material are provided. In one or more embodiments, a carbonaceous material and water can be mixed to provide a slurried mixture. The water mixed with the carbonaceous material can be at least 90% liquid phase. At least a portion of the slurried mixture can be gasified in the presence of a combustion gas to provide carbonaceous solids and a syngas comprising hydrogen, carbon monoxide, and carbon dioxide. The syngas can be at a temperature of from about 400° C. to about 1,650° C. At least a portion of the carbonaceous solids can be selectively separated from the syngas to provide a syngas product and carbonaceous solids. At least a portion of the separated carbonaceous solids can be combusted in the presence of an oxidant to provide at least a portion of the combustion gas.
Description
BACKGROUND[0001]1. Field[0002]The present embodiments generally relate to the gasification of carbonaceous material. More particularly, the present embodiments relate to increasing carbon dioxide content of gasified carbonaceous material.[0003]2. Description of the Related Art[0004]The gasification of carbonaceous material typically involves reacting carbonaceous material in a gasifier in a reducing (oxygen-starved) atmosphere at high temperature and high pressure. The resulting syngas contains hydrogen, carbon monoxide, and carbon dioxide. Often at least a portion of the carbon monoxide, if not all, is then converted to carbon dioxide and removed before useful products can be recovered.[0005]Carbon monoxide is typically converted to carbon dioxide in one or more carbon dioxide converters, e.g. a high temperature shift converter followed by a low temperature shift converter. These shift converters require chemicals, catalyst, heat, and / or pressure. As such, carbon dioxide converters...
Claims
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IPC IPC(8): C10J3/48C10J3/46
CPCY02E20/185Y02E20/18C10J3/56C10K1/004C10K3/04C10J2300/0909C10J2300/0916C10J2300/093C10J2300/0943C10J2300/0946C10J2300/0956C10J2300/0959C10J2300/0976C10J2300/1612C10J2300/165C10J2300/1653C10J2300/1659C10J2300/1675C10J2300/1678C10J2300/1838Y02E50/32Y02E50/30Y02P20/145
Inventor AGRAWAL, RAVINDRA K.CHANDRASEKARAN, JAYACHANDRAN
Owner KELLOGG BROWN & ROOT LLC