Mixture and apparatus for blending non-aqueous slurries

Abstract

The disclosures described herein provide for a gasification feedstock which includes a mixture of a solid feedstock with a liquid feedstock. The solid feedstock includes a heating value of less than approximately 20 Megajoules / kilogram (MJ / kg), expressed on a wet basis. The non-aqueous liquid feedstock includes a heating value of greater than approximately 14 MJ / kg, expressed on a wet basis. The resulting feedstock is useful as a gasification fuel.

Description

BACKGROUND OF THE INVENTION[0001]The subject matter disclosed herein relates to the gasification of slurry. More specifically, disclosed embodiments of the invention relate to the preparation and delivery of feed slurries to a gasifier.[0002]Fossil fuels, such as coal or petroleum, may be gasified for use in the production of electricity, chemicals, synthetic fuels, or for a variety of other applications. Gasification involves reacting a carbonaceous fuel with sub stoichiometric amounts of oxygen at high temperature and pressure to produce syngas, a gaseous fuel containing primarily carbon monoxide and hydrogen, which burns much more efficiently and cleaner than the fuel in its original state.[0003]Known gasification processes overcome the challenge of feeding solid carbonaceous fuels, such as coal, into a high pressure gasifier by grinding the coal to a fine powder and mixing the powder with water to form an aqueous coal slurry that can be transported into the gasifier using conven...

AI Technical Summary

Benefits of technology

This patent is related to a system and method for gasifying a mixture of solid and liquid feedstocks to create a gasification feedstock. The technical effects of the invention include the ability to utilize low-quality solid feedstocks and high-quality liquid feedstocks to create a high-quality gasification feedstock. This improves the overall efficiency of the gasification process and reduces the amount of waste and cost. The system includes a feedstock mixing tank and a control system to adjust the ratio of solid and liquid feedstocks to achieve the desired gasification feedstock. This technology can be used in various applications such as industrial gasification and power generation.

Problems solved by technology

First, the fuel itself must have a relatively high gross heating value.

But this degrades the product syngas composition by shifting more of the gas to carbon dioxide and water and away from the more desirable carbon monoxide and hydrogen products.

In addition, many of them may have high internal moisture content, so they produce aqueous slurries with lower solids content.

Both of these factors make lignites and sub bituminous coals less desirable feeds for gasifiers.

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