Method and apparatus for particle recycling in multiphase chemical reactors

a chemical reactor and multi-phase technology, applied in the details of gasification processes, combustible gas production, fuel gas production, etc., can solve the problems of inability to reach dipleg, rapid and easy eroded, and insufficient, so as to reduce the quantity of ash, simplify the gasification system, and reduce the effect of capital investmen

Inactive Publication Date: 2013-11-28
SYNTHESIS ENERGY SYST
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AI Technical Summary

Benefits of technology

[0010]As discussed above, fly ash was routinely returned to the gasifier in an attempt to recycle and reuse the carbon contained therein and reduce ash quantity, but the results have not been satisfactory. The present invention allows the gasification systems to be simplified and capital investment reduced, and the limitation on fines content in feedstock removed or at least relaxed.

Problems solved by technology

As discussed above, fly ash was routinely returned to the gasifier in an attempt to recycle and reuse the carbon contained therein and reduce ash quantity, but the results have not been satisfactory.
Due to the high temperature and high particle velocity within the high temperature zone, the dipleg cannot reach the high temperature zone, or it would be quickly and easily eroded.

Method used

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  • Method and apparatus for particle recycling in multiphase chemical reactors
  • Method and apparatus for particle recycling in multiphase chemical reactors
  • Method and apparatus for particle recycling in multiphase chemical reactors

Examples

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example 1

[0043]A pneumatic gas conveying system was used to delivery the fine fly ash, collected from a baghouse with or without an operational second-stage cyclone, into a high temperature (higher than the hemisphere temperature, or T3, for the fly ash) zone, which is also O2-rich (>10%), of the gasifier.

[0044]Pneumatic Convey System Design A fully automatic programmable logic control (PLC) system was used, and interlock protections were designed. The connection to gasifier was through a D80 pipe installed with an angle of approximately 45° to the vertical center pipe (5) and enters through the distribution plate or grid board.

[0045]Control experiments were performed wherein the fly ash was not returned to the high-temperature zone. Specifically, a coal gasification system, as described in FIG. 1, was operated for 48 hours, wherein the fly ash were not returned to the gasifier.

[0046]The system was then operated for 72 hours, wherein the fly ash was returned to the high-temperature region vi...

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Abstract

Method and apparatus for recycling fine ash particles for a multiphase chemical reactor (MCR), wherein coal is partially oxidized in the MCR to produce an exit gas stream in which fine ash particles are entrained, and wherein the MCR comprises a high temperature region with a temperature at or above a fusion temperature of the fine ash particles, wherein substantially all of the fine ash particles from the exit gas stream are returned to the high temperature region, to achieve improved carbon conversion and reduction in fly ash quantity.

Description

FIELD[0001]The present invention relates to a method and apparatus for collecting and recycling fine solids in a multiphase chemical reactor, e.g. a fluidized bed reactor, an entrained-flow bed reactor, and a fixed bed reactor, in particular as it is used in gasification of coal, biomass and municipal solid waste.BACKGROUND OF THE INVENTION[0002]In industrial chemical engineering, several types of reactors are commonly used to carry out a variety of multiphase chemical reactions. Fixed bed reactors (counter-current or co-current), fluidized bed reactors, and entrained-flow bed reactors are typical multiphase reactors. They are often used in gasification of coal, biomass and municipal solid waste (MSW).[0003]Specifically, a counter-current fixed bed (“up draft”) gasifier comprises a fixed bed of carbonaceous fuel (e.g. coal, biomass or MSW) through which the gasification agent (steam, carbon dioxide, oxygen and / or air) flows in counter-current configuration. A co-current fixed bed (“...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10J3/84
CPCC10J3/84C10J3/482C10J3/523C10J3/721C10J2300/0916C10J2300/093C10J2300/0959C10J2300/0976C10J2300/1631C10J2300/1634
Inventor XU, CHUNFAWU, LONG
Owner SYNTHESIS ENERGY SYST
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