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TWO-ZONE FLUIDIZATION VESSEL DESIGN FOR GASIFIER FEED SYSTEM

IP.com Disclosure Number: IPCOM000228005D
Publication Date: 2013-Jun-03
Document File: 4 page(s) / 108K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention concerns coal gasification plant and feed system for solid-gas mixtures thereof. Fluidization vessels have been envisaged to ensure uniform mixing of the gas and coal particles and to transport the mixture in a stable manner. This is achieved by providing two separate fluid flow zones, a highly turbulent mixing zone and a lower transportation zone. The turbulent mixing zone has multiple air jets through which gas-solid mixtures are introduced to dilute the incoming concentrated gas-solid mixture and to ensure uniform mixing. The bottom zone is used to convey the mixture as it is separated from the mixing zone. In a second design, highly concentrated mixture (50% solids) enters the vessel in a counter-acting vortex near the top of the fluidization vessel, which ensures thorough mixing. The angle of impingement of the gas jets is used to control the residence time of the gas-solid mixture. Gas is added at various levels, dilutions and at suitable angles to maintain uniformity of the mixture as well as a stable and controlled flow rate.

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TWO-ZONE FLUIDIZATION VESSEL DESIGN FOR GASIFIER FEED SYSTEM

BACKGROUND

The invention concerns coal gasification plant and feed system for solid-gas mixtures thereof. In gasification plant, it is required to mix the gas feed with incoming concentrated gas-solid mixture so that diluted gas-solid mixture can be transported in a stable manner to the feed injector through conveyance pipe. In current designs, a transition vessel is used to mix solid and gas for transport through the conveyance pipe. However, settling of the solids to the bottom surface of the vessel cannot be completely avoided in this design. Moreover, mixing is ineffective as it does not fluidize the coal particles. Fluidizing type mixers for solid-gas feed are known as in US patents 403355, 4466082, 4834588 and 4502819. The present invention presents a two-zone fluidization vessel for gasification plant.

DRAWINGS

Two-zone fluidization vessel design for gasifier feed system is disclosed with reference to the drawings:

Figure 1 shows two-zone fluidization vessel design for turbulent mixing.

Figure 2 shows two-zone fluidization design with vortex mixing.

DETAILED DESCRIPTION

Fluidization vessels have been envisaged to ensure uniform mixing of the gas and coal particles and to transport the mixture through conveyance pipe in a stable manner. This is achieved by providing two separate fluid flow zones as shown in Fig. 1 and 2. In the first design shown in Fig. 1, the vessel has two zones, a highly turbulent mixing zone and a lower transportation zone. The turbulent mixing zone has multiple air jets through which gas-solid mixtures are introduced  to dilute the incoming concentrated gas-solid mixture and to ensure uniform mixing. The bottom zone will transport this mixture to the conveyance pipe in a stable manner since it is separated from the turbulent mixing zone. In a second design shown in Fig. 2, highly concentrated mixture (50% solids) enters the vessel in a counter-acting vortex near the top of the fluidization vessel.

In operation, concentrated (30% solids) gas-solid mixture enters the fluidization vessel from the top inlet. Within the fluidization vessel, gas mixtures at various solid dilutions are added as jets at different levels. Downward facing strong impinging multiple gas jets (20% dilution) around the periphery of the vessel help to dilute the gas-solid mixture. Upward facing gas jets of 40% solids concentration impinge on the downward moving gas-solid mixture. The counteracting gas jets give rise to re-circulating zones inside the Mixing Zone of the vessel, ensuring proper mixing of the coal particles with the gas. The gas-solid mixture comes out of the Mixing...