Flux addition as a filter conditioner
First Claim
1. An improved process for gasification of a carbonaceous material, comprising:
- a. providing a gasification reactor, wherein said reactor converts carbonaceous feedstock to produce a mixture product comprising a first gaseous product stream and char,wherein said gaseous product stream comprises H2, and CO,b. passing said mixture product through an initial separating device, whereby some of said char is removed from said gaseous product stream,c. introducing a coarse particulate fluxing agent into the gaseous product stream downstream from said initial separating device, wherein said coarse particulate fluxing agent has an average size range between 5 microns and 30 microns,d. providing a particle filtration unit comprising a plurality of filter elements downstream from the point of introduction of said coarse particulate fluxing agent,e. depositing a thin layer of the fluxing agent onto and within the pores of the filter elements to condition the filter elements and decrease the subsequent permeability of the filter elements to entrained char particles, while maximizing permeability of the filter elements to synthesis gas;
f. periodically removing a mixture comprising filter-cake from the filter elements by back-pulsing, wherein said filter-cake comprises coarse particulate fluxing agent and char,g. forming a mixture comprising the removed char of step (b) and the removed filter-cake of step (f), then routing this mixture to the gasification reactor of step (a).
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Accused Products
Abstract
Improvements in a gasification system and process for gasifying carbonaceous feedstock with improved energy efficiency. Improved methods and systems for more efficient removal of particulates from a raw synthesis gas while simultaneously providing a novel mechanism for fluxing agent addition to the gasification reactor. A conditioning agent, in the form of coarse fluxing agent particles, is added to the raw synthesis gas upstream from the particle filtration unit. The conditioning agent allows more rapid turnaround of the filtration unit following filter element replacement, extend filter life, facilitates the removal of filter cake from the particle filters, and combines with removed filter cake for recycling to the gasifier. Addition of fluxing agent via this route eliminates the need to premix fluxing agent with the carbonaceous feedstock, thereby maximizing the rate of feedstock addition to the gasification reactor.
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Citations
10 Claims
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1. An improved process for gasification of a carbonaceous material, comprising:
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a. providing a gasification reactor, wherein said reactor converts carbonaceous feedstock to produce a mixture product comprising a first gaseous product stream and char, wherein said gaseous product stream comprises H2, and CO, b. passing said mixture product through an initial separating device, whereby some of said char is removed from said gaseous product stream, c. introducing a coarse particulate fluxing agent into the gaseous product stream downstream from said initial separating device, wherein said coarse particulate fluxing agent has an average size range between 5 microns and 30 microns, d. providing a particle filtration unit comprising a plurality of filter elements downstream from the point of introduction of said coarse particulate fluxing agent, e. depositing a thin layer of the fluxing agent onto and within the pores of the filter elements to condition the filter elements and decrease the subsequent permeability of the filter elements to entrained char particles, while maximizing permeability of the filter elements to synthesis gas; f. periodically removing a mixture comprising filter-cake from the filter elements by back-pulsing, wherein said filter-cake comprises coarse particulate fluxing agent and char, g. forming a mixture comprising the removed char of step (b) and the removed filter-cake of step (f), then routing this mixture to the gasification reactor of step (a). - View Dependent Claims (2, 3, 4, 5, 6)
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7. An improved process for gasification of a carbonaceous material, comprising:
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a. providing a gasification reactor comprising a first stage for partially combusting the carbonaceous material to produce heat and a first mixture product, and an unfired second stage for pyrolyzing the mixture product, wherein said reactor converts carbonaceous feedstock to produce a mixture product comprising a first gaseous product stream and a solid particulate stream, wherein said first gaseous product stream comprises H2 and CO, and wherein said solid particulate stream comprises char; b. passing said mixture product through an initial separating device, whereby some of said char is removed from said gaseous product stream, c. introducing a coarse particulate fluxing agent into the gaseous product stream downstream from said initial separating device, wherein said coarse particulate fluxing agent has an average size range between 5 microns and 30 microns, d. providing a particle filtration unit comprising a plurality of filter elements downstream from the point of introduction of said coarse particulate fluxing agent, e. depositing a thin layer of the fluxing agent onto and within the pores of the filter elements to condition the filter elements and decrease the subsequent permeability of the filter elements to entrained char particles, while maximizing permeability of the filter elements to synthesis gas; f. periodically removing a mixture comprising filter-cake from the filter elements by back-pulsing, wherein said filter-cake comprises coarse particulate fluxing agent and char. g. forming a mixture comprising the removed char of step (b) and the removed filter-cake of step (f), then routing this mixture to the gasification reactor of step (a). - View Dependent Claims (8, 9, 10)
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Specification