The present disclosure relates to a dry coal extrusion pump for coal gasification, and more particularly to a multiple moving wall arrangement therefor.
The coal gasification process involves conversion of coal or other carbon-containing solids into synthesis gas. While both dry coal and water slurry are used in the gasification process, dry coal pumping may be more thermally efficient than current water slurry technology. In order to streamline the process and increase the mechanical efficiency of dry coal gasification, the use of dry coal extrusion pumps has steadily become more common in dry coal gasification. Some currently available dry coal extrusion pumps suffer from internal shear failure zones and flow stagnation problems. The presence of failure zones may lead to decreased mechanical efficiency.
Various features will become apparent to those skilled in the art from the following detailed description of the disclosed non-limiting embodiment. The drawings that accompany the detailed description can be briefly described as follows:
The pump 10 generally includes an inlet 12, a passageway 14 and an outlet 16. The passageway 14 includes a multiple moving wall arrangement in which a moving wall 20A-20D (
Pulverized dry coal is introduced into pump at inlet 12, communicated through passageway 14, and expelled from pump 10 at outlet 16. The outlet 16 may be controlled through a rotatable valve 28. The moving walls 20A-20D drive the pulverized dry coal through passageway 14.
Referring to
Referring to
Referring to
Referring to
If the angle θ between the two driven moving walls 20A′, 20B′ is greater than zero, as described in U.S. Pat. No. 7,387,197, then the
It should be understood that other arrangements may alternatively be provided which, for example, alternate between the
It should be further understood that these arrangements contemplate small sections—such as the corners—which may be stationary, however, all sides of the passageway 14 will primarily be a “moving wall.”
It should be understood that relative positional terms such as “forward,” “aft,” “upper,” “lower,” “above,” “below,” and the like are with reference to the normal operational attitude of the vehicle and should not be considered otherwise limiting.
It should be understood that like reference numerals identify corresponding or similar elements throughout the several drawings. It should also be understood that although a particular component arrangement is disclosed in the illustrated embodiment, other arrangements will benefit herefrom.
Although particular step sequences are shown, described, and claimed, it should be understood that steps may be performed in any order, separated or combined unless otherwise indicated and will still benefit from the present disclosure.
The foregoing description is exemplary rather than defined by the limitations within. Various non-limiting embodiments are disclosed herein, however, one of ordinary skill in the art would recognize that various modifications and variations in light of the above teachings will fall within the scope of the appended claims. It is therefore to be understood that within the scope of the appended claims, the disclosure may be practiced other than as specifically described. For that reason the appended claims should be studied to determine true scope and content.
This disclosure was made with Government support under 2007LDA798PWR2007-42 awarded by The Department of Energy. The Government may have certain rights in this disclosure.
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