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Method and apparatus for ash cooling

Inactive Publication Date: 2014-10-23
SYNTHESIS ENERGY SYST
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Benefits of technology

The present invention provides a method and apparatus for gasification of high temperature, high pressure flowing solids. The invention solves the technical problem of handling costly and unreliable high temperature, high pressure flowing solids and improves the efficiency of the gasification process. The gasification system includes a high temperature ash cooler and a second ash cooler device connected to the high temperature ash cooler to further lower the temperature of the ash to ambient temperature, or a depressurizing device connected to the second ash cooler to reduce the pressure of the ash to ambient pressure. Such improvements provide a safer, cost-effective, and reliable solution for gasification of high temperature, high pressure flowing solids.

Problems solved by technology

As discussed above, handling high temperature, high pressure flowing solids is not only costly but also not reliable.
Some attempts have been made to make improvement, but the results have not been satisfactory.
Additionally, these improved cooling solutions also result in waste of thermal energy and water recourse.

Method used

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  • Method and apparatus for ash cooling
  • Method and apparatus for ash cooling
  • Method and apparatus for ash cooling

Examples

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Embodiment Construction

[0040]A fluidized bed gasifier, as shown in FIG. 3, comprises a vessel housing a headspace 2 above a fluidized bed 1 of the solid material being gasified and a conical perforated gas distribution grid 7 below the bed through which the gasifying medium is introduced at sufficient velocity to fluidize the solid feed material in the gasifier. The gasifying medium (steam and / or oxygen) is introduced into the gasifier from the plenum space 4 through the grid 7 to fluidize and partially oxidize the solid feed stock.

[0041]A passage such as a pipe 6 (“center jet pipe”) in the center region at the bottom of the grid cone introduces oxidant with diluting gas to the bed. Gas velocity of the centre jet pipe 6 is normally greater than the average superficial velocity of gas in the fluidized bed 1. An ash discharge device 5 comprising an annular passage is provided around this center jet pipe 6 for coal ash agglomerated withdrawal and also for provision of additional gas, such as steam, which may...

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Abstract

Systems and methods for step-wise cooling high pressure and high temperature ash discharged from the gasifier used for gasification of carboneous materials, wherein a high pressure cooler cools the ash under the operating pressure of the gasifier, which may be followed by a depressurizer which brings the cooled ash to safe-handling temperature. A low temperature ash cooler may also be optionally used. Also provided is a system where a wet scrubber is used to clean the syngas from the gasifier, the waste water blow down from the scrubber is used to cool the hot ash either in the high temperature ash cooler, or the low temperature ash cooler. Steam generated in the ash coolers is supplied back to the gasifier to reduce steam consumption.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 786,614, filed Mar. 15, 2013, which is incorporated by reference herein in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to coal gasification using fluidized bed reactor. More specifically, the present invention relates to a method and apparatus for cooling and handling high temperature and high pressure ash discharged from a fluidized bed gasification reactor. The present invention also relates to a method and apparatus for using waste water from a syngas scrubber in the cooling of hot ash discharged from the gasifier.BACKGROUND OF THE INVENTION[0003]Gasification of carbon containing or carbonaceous materials is used to produce syngas, a mixture of carbon monoxide, hydrogen, carbon dioxide, and other components. Various types of gasifiers are known and used, including a moving bed gasifier, entrained flow gasifier, and fluidized bed gasifi...

Claims

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Application Information

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IPC IPC(8): C10J3/72
CPCC10J3/72C10J3/482C10J3/523C10J3/84C10K1/024
Inventor WINTER, JOHN D.
Owner SYNTHESIS ENERGY SYST
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