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NOVEL TRENCH DESIGN WITH CONTINUOUS FLUSHES FOR USE IN SOLIDS GASIFICATION PLANTS

IP.com Disclosure Number: IPCOM000228850D
Publication Date: 2013-Jul-10
Document File: 3 page(s) / 64K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a new trench network design with continuous flushes for use in solids gasification plant. The bottom and walls of the trench network are designed to a smooth cylindrical surface with a steeper angle than the conventional flat bottom design The discharge manifold of the area sump pump is designed to redistribute the working inventory of the area sump to the farthest point on the trench in such a way that the trenches are being flushed continuously such that solids cannot accumulate along these trenches. The continuous flow through the trenches avoids the formation of ice that obstructs flow and also increases the capacity of the trench to accumulate solids compared to the flat bottom design. By the improved design, time wasted on cleaning the length of the trench network and potential safety issues arising from leaving an open trench or grating unattended are minimized.

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NOVEL TRENCH DESIGN WITH CONTINUOUS FLUSHES FOR USE IN SOLIDS GASIFICATION PLANTS

BACKGROUND

This invention relates generally to trench design and more particularly to an improved trench network with continuous flushes for area sumps in solids gasification plant. In general, each area sump is typically designed with at least one pump for pumping the excess working inventory (water and solids) of that sump to a disposal or recycle destination. These pumps and their manifolding are directed to several disposal destinations when the pump is operated based on the operating level of the sump.

Each area sump comprises a trench network which is a series of low point, below grade, flat bottom chutes with 90 degree sides to route liquids and solids towards the area sump from those areas that are defined as area pads. Based on the design of the trench network, the liquids are allowed to gravity flow into the area sump for trapping and accumulating solids that are to be removed manually. This removal process requires removal of grating that covers these trenches which poses a serious safety issue if the exposed trench section is not barricaded properly. But with the existing flat bottom trench design efficient disposal of solids is not achievable. Thus to overcome the above drawbacks of resource requirement, time taken to remove grating and to mitigate safety issues and for a significant improvement on an overall design, a novel trench network with continuous flushes is proposed.

DRAWINGS

Novel trench design with continuous flushes for use in solids gasification plants is disclosed with reference to the following drawings in which:

Figure 1 shows the proposed trench cross section along with existing design.

Figure 2 illustrates pumped circulation for continuous flushing of trenches in gasification plant.

DETAILED DESCRIPTION

The invention proposes a new trench network design with continuous flushes for use in solids gasification plant. The bottom and walls of the trench network are designed with a smooth cylindrical surface with a steeper angle than the conventional flat bottom design, as shown in Fig. 1, for example. The discharge manifold of the area sump pump is designed to redistribute the working inventory of the area sump to the farthest point on the trench in such a way that the trenches are being flushed continuously such that solids cannot accumulate along these trenches, as shown in Fig. 2. A series of pumps is used to pump the sump water ...