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Modified Multiple Element Injector

IP.com Disclosure Number: IPCOM000226806D
Publication Date: 2013-Apr-22
Document File: 5 page(s) / 456K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention relates to coal gasifiers and in particular, injector for combustion of pulverized coal. The injector design uses multi-element injection to rapidly mix the coal with hot steam and oxygen while rapidly dispersing the coal across the reactor’s cross-section. The invention is a modification to angle a portion of the face of the injector where the triplets are located so that they are mutually orthogonal about the centerline of the injector, as opposed to the current flat design. The new design is intended to produce significant spreading of the inner sprays and recirculation zones without necessarily making the injector tip significantly larger. In addition to potentially improving the efficiency of the injector, the smaller possible size may also reduce cost, coolant requirements, and may also help move the initial flame propagating zones away from the wall of the refractory, towards the middle of the gasifier.

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MODIFIED MULTIPLE ELEMENT INJECTOR

BACKGROUND

The invention relates to coal gasifiers and in particular, injector for combustion of pulverized coal. The injector design uses multi-element injection to rapidly mix the coal with hot steam and oxygen while rapidly dispersing the coal across the reactor’s cross-section. Problems with injectors for coal combustion include improvements in operational efficiency, durability and life of components including the injector itself, and the refractory liner of the gasifier. This invention is a modified multi-element gasification injector developed by Rocketdyne (US8308829), referred to as the "Rapid Mix Injector" (RMI) shown in Fig. 1. 

FIG. 1: Original annular triplet injector in cross section

BRIEF DESCRIPTION OF DRAWINGS

Modified multiple element injector is disclosed with reference to the following drawings.

Figure 1 shows the original annular triplet injector in cross section.

Figure 2 is a cross section of the modified multiple element injector.

Figure 3A shows inner and outer toroidal recirculation zones of the gasifier.

Figure 3B shows the inner toroidal zones ahead of the injector nozzles.

Figure 4 is a cross-sectional view showing slanted face and multiple recirculation zones.

Figures 5 shows possible simplified projected views of face of injector.

 


DETAILED DESCRIPTION

The RMI (Fig. 1) uses multiple sets of 2-on-1 orifices (oxygen-fuel-oxygen or CO2-fuel-CO2), referred to as "triplets," to produce multiple toroidal recirculation zones. The invention is a modification to angle a portion of the face of the injector where the triplets are located so that they are mutually orthogonal about the centerline of the injector, as shown in Fig. 2. The toroidal recirculation zones produced using the modified injector are shown in Fig. 3A and 3B.

FIG. 2: Cross section of the modified multiple element injector

FIG 3B: Inner toroidal zones ahead of the injector nozzles

 

FIG 3A:          Inner and outer toroidal recirculation zones of the gasifier

 

This concept can be utilized with a wide variety of mixing elements, including but not limited to, for example, 1-on-1, 4-on-1, 6-on-1, designs, etc.  Placing elements on faces that are at an angle to a centerline is particularly advantageous for a circumferential design.  For instance, if the injector is built with elements aligned along more than one circumference, the angles of the faces of each could be modified to produce optimum mixing and recirculation, taking into account size constraints of the gasifier, the injector, and the elements.

Another option is...