Title of Invention

SPECIES INJECTION LANCE

Abstract

Accordingly there is provided an improved species injection lance for species injection through nozzle into a reactor, comprising; a main pipe having a predetermined inner diameter, the main pipe having sideway provisions to insert a lance pipe, the lance pipe on insertion forming an angle at an exit plane with respect to a centerline of the main pipe; and a nozzle rigidly fixed at a distal end of the main pipe. The lance pipe is inserted into the main pipe such that a tip of the lance pipe is fixed at a distance from an intersection of the centerlines of the lance pipe and the main pipe. The center line of the lance pipe makes on a angle from the centre line of the main pipe. The tip of the lance pipe is configured to have an angle in respect of the centerline of the lance pipe. The device features establishes a relationship of F = (? - a). For a typical configuration of the pipe and the nozzle; the insertion angle of the injection lance and the position of the tip of the lance, there exists an optimum angle of the lance exit plane ? with respect to the center line of the main pipe mid the nozzle, which gives the best possible dispersion of species and which causes minimum contact of species with the inner surface of main pipe and the nozzle. With this finding the development of the Invention proceeds. For a typical inlet diameter of the main pipe, an exit diameter of the nozzle, an insertion angle V of the injection lance and a distance 'd' of the tip of the lance with respect to the centreline of the main pipe, there exists an optimum position 'd' of the lance tip along the lance axis with respect to the centerline of the main pipe, which gives the best possible dispersion of species and which causes minimum contact of species with the inner surface of main pipe and the nozzle. The invention considers such a finding for crystatizing the Invention, As the spread of the pulverized species is almost the same for all angles of the lance exit plane, so it would be better to adopt an angle which gives the least contact angle at the inner surface of the nozzle.

Full Text

-2- FIELD OF INVENTION The invention relates to a species injection lance adapted for species injection in a nozzle. More specifically , the invention relates to an improved species injection lance for pulverized coal injection through tuyers into blast furnace. BACKGROUND OF THE INVENTION A species injection lance of the art generally constitutes a circular pipe consisting of a main pipe having a nozzle, and a small circular pipe (lance), which is transversely inserted in the main pipe. Lance pipe is used for injection of species into the main pipe. A distance is maintained between the tip of the lance pipe towards its discharge end, from the intersection of the center line of the lance pipe and the main pipe. The lance pipe can be inserted or retracted in the direction of its axis. Hence, the distance is variable. For a given nozzle , the angle of the lance tip plane with respect to the center line of the nozzle and the pipe, is normally decided ad-hoc basis to suit the immediate and physical working advantages. Further, the position of the lance tip along the lance axis with respect to the centerline of the nozzle is normally fixed on the basis of the available length of the lance. In other words, the lance tip angle and its distance from the intersections of centerlines, In the prior art, are decided arbitrarily. Such configuration of the lance results in inefficient dispersion of species and further causes fast erosion of nozzle body owing to impact of species. -3- OBJECTS OF THE INVENTION It is therefore an object of the invention to propose an improved injection lance which eliminates the disadvantages of the prior art. Another object of the invention is to propose an improved species injection tance, which achieves higher dispersion of species across the nozzle cross section. A still another object of the invention is to propose an improved species injection lance, which causes minimum erosion of nozzle body. A further object of the invention is to propose an improved species injection lance, which enables efficient mixing of injected species and fluid for achieving higher interactions of the species with the fluid. SUMMARY OF THE INVENTION Accordingly there is provided an improved species injection lance for species injection through nozzle into a reactor, comprising; a main pipe having a predetermined inner diameter, the main pipe having sideway provisions to Insert a lance pipe, the lance pipe on insertion forming an angle at an exit plane with respect to a centerline of the main pipe; and a nozzle rigidly fixed at a distal end of the main pipe. The lance pipe is inserted into the main pipe such that a tip of -4- the lance pipe is fixed at a distance from an intersection of the centerlines of the lance pipe and the main pipe. The center line of the lance pipe makes on a angle from the centre line of the main pipe. The tip of the lance pipe is configured to have an angle in respect of the centerline of the lance pipe. The device features establishes a relationship of F = (? - a). For a typical configuration of the pipe and the nozzle, the insertion angle of the injection lance and the position of the tip of the lance, there exists an optimum angle of the lance exit plane '?' with respect to the center tine of the main pipe and the nozzle, which gives the best possible dispersion of species and which causes minimum contact of species with the inner surface of main pipe and the nozzle. With this finding the development of the invention proceeds. For a typical inlet diameter of the main pipe, an exit diameter of the nozzle, an insertion angle 'a'of the injection lance and a distance 'd' of the tip of the lance with respect to the centreline of the main pipe, there exists an optimum position 'd' of the lance tip along the lance axis with respect to the centerline of the main pipe, which gives the best possible dispersion of species and which causes minimum contact of species with the inner surface of main pipe and the nozzle. The invention considers such a finding for crystatizing the invention. As the spread of the pulverized species is almost the same for all angles of the lance exit plane, so it would be better to adopt an angle which gives the least contact angle at the inner surface of the nozzle. -5- BRIEF DESC RIPTIOH OF THE ACCOMPANYING DRAWINGS Fig 1a - Schematically shows a cross-section of the species injection lance according to the invention. Fig 1b - Schematically shows a sectional view of the lance pipe according to the invention. Fig 2 - shows a schematic diagram of the species injection lance indicating the exit plane angle of the tip of the lance pipe,. Fig.3 - Cross-section of the nozzle at the discharge end schematically showing a) the dispersion of injected species and b) the contact angle 'b of species with the inner surface of the nozzle. Fig 4 - shows a graphical representation of variation of contact angle of species at the nozzle tip as a function of the exit plane angle of the lance. Fig 5 - shows a schematic graph on the coverage of, the injected species touching nozzle periphery as a functional of the lance exit plane angle. Fig 6 - Schematically shows a variation in contact angle at the discharge end of the nozzle with the variation of the lance exit plane angle (with lance tip fixed at 'd' mm away from the center line). -6- Fig 7 - Schematically shows a variation in contact angle at the nozzle tip as a function of the lance tip position from the enterline,(? - a ). Fig 8 - shows a variation of mass fraction of the species across the diameter at the nozzle exit plane with different angles of lance exit plane (lance tip positioned at the center line of main pipe). DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION Figure l(a) shows a cross-section of a circular pipe consisting of a main pipe (1) of inner diameter lDp' at the inlet and a> nozzle (3). A small circular pipe (2) (lance ) of inner diameter dP' is inserted in the main pipe (1) such that a center line (6) of the lance pipe (2) makes an angle 'a'from the centre line (4) of the main pipe (1). The tip (2a) of the lance pipe (2) toward the discharge end is at a distance 'd' away from the intersection (5) of the centerlines (4,6) of the lance pipe (2) and the main pipe (1). The lance pipe (2) can be inserted or retracted in the direction of its axis and the distance 'd' is, therefore, a variable. Figure - 1 (b) shows the exaggerated view of the cross-section of the lance pipe (2). The tip (2) of the lance pipe (2) towards the discharge end is cut in such a way that the normal to the cut plane (7) makes an angle 'F' (also referred to as exit plane angle) form the centertine (6) of the lance pipe (2). -7- In Figure-2, it is shown that the exit plane of the tip (2a) of the lance pipe (2) makes an angle 'F' from the centre line (4) of the main pipe (1) and the centerltne (6) of the lance pipe (2) is at an angle V from the center line axis of the main pipe (1). It may be noted, by difference, that the exit plane angle 'F'of the lance pipe (2) with respect to the centerline (4) of the main pipe (1) should be equal to (F + a). In other words, the tip (2a) of the lance pipe (2) is cut at an angle 'F' such that F= (? - a). A stream of fluid moves at a high velocity In the main pipe (1). The species is injected from the lance pipe (2) into the main pipe (1) and the species get mixed and dispersed in the stream of fluid. Figure-3 schematically shows the dispersion of species and the contact angle 'b' of the species with an inner surface of the nozzle (3). To achieve that the species develop minimum contact with the inner surface of the main pipe (1) and/or the nozzle (3) and to ensure that minimum wear of the i inner surface takes place, a contact angle 'b' of the species with the inner surface of nozzle (3) at the discharge end of the nozzle (3) is formed. The configured species injection lance can be used for injection of the species in of achieve maximum mixing efficiency a stream of high velocity fluid with a view of the species and for minimum damage to the inner surface of the pipe. For example, this configuration can be applied to pulverized coal injection through tuyeres into a blast furnace with minimum wear of a tuyere body and for achieving higher dispersion of pulverized coal across the tuyere cross-section. Higher dispersion of the pulverized coal should enable efficient mixing of pulverized coal and blast air for achieving higher combustion efficiency the of pulverized coal in the tuyere before entry of the pulverized coal particles into the blast furnace. -6-WE CLAIM 1. An improved species injection lance for pulverized coat injection through tuyeres into a blast furnace, comprising: - a main pipe (1) having a predetermined inner diameter (Dp)r the main pipe (1) having sideway provisions to insert a lance pipe (2), the lance pipe (2), on insertion forming an angle (e) at an exit plane with respect to a centerline of the main pipe (1); and - a nozzle (3) rigidly fixed at a distal end of the main pipe (1); characterized in that the lance pipe (2) is inserted into the main pipe (1) such that a tip (2a) of the tance pipe (2) is fixed at a distance (d) from an intersection (5) of the centerlines (4,6) of the lance pipe (2) and the main pipe (I), in that the center line (6) of the lance pipe (2) makes a angle (a) from the centre line (4) of the main pipe (1), in that the tip (2a) of the lance pipe (2) is configured to have an angle (?) in respect of the centerline (6) of the lance pipe, and in that the device features achieve a relationship of F = (? - a). 2. An improved species injection lance for species injection through nozzle into a reactor as substantially described herein with reference to the accompanying drawings.

Documents:

00653-kol-2006-abstract 2.pdf

00653-kol-2006-correspondence-1.1.pdf

00653-kol-2006-form-1-1.1.pdf

00653-kol-2006-form-9.pdf

0653-kol-2006 abstract.pdf

0653-kol-2006 claims.pdf

0653-kol-2006 description (complete).pdf

0653-kol-2006 drawings.pdf

0653-kol-2006 form-1.pdf

0653-kol-2006 form-3.pdf

0653-kol-2006 g.p.a.pdf

0653-kol2006 correspondence others.pdf

0653-kol2006 form-2.pdf

653-kol-2006 description (complete).pdf

653-kol-2006-abstract 1.1.pdf

653-KOL-2006-ABSTRACT-1.1.pdf

653-kol-2006-amanded claims.pdf

653-kol-2006-amanded pages of specification 1.1.pdf

653-kol-2006-amanded pages of specification 1.2.pdf

653-KOL-2006-AMANDED PAGES OF SPECIFICATION-1.2.pdf

653-kol-2006-amanded pages of specification.pdf

653-kol-2006-claims.pdf

653-kol-2006-correspondence 1.1.pdf

653-KOL-2006-CORRESPONDENCE 1.3.pdf

653-KOL-2006-CORRESPONDENCE-1.2.pdf

653-kol-2006-drawings 1.1.pdf

653-kol-2006-examination report reply recieved.pdf

653-KOL-2006-EXAMINATION REPORT.pdf

653-KOL-2006-FORM 18.pdf

653-KOL-2006-FORM 3.pdf

653-KOL-2006-FORM 9.pdf

653-KOL-2006-GPA.pdf

653-KOL-2006-GRANTED-ABSTRACT.pdf

653-KOL-2006-GRANTED-CLAIMS.pdf

653-KOL-2006-GRANTED-DESCRIPTION (COMPLETE).pdf

653-KOL-2006-GRANTED-FORM 1.pdf

653-KOL-2006-GRANTED-FORM 2.pdf

653-KOL-2006-GRANTED-LETTER PATENT.pdf

653-KOL-2006-GRANTED-SPECIFICATION.pdf

653-kol-2006-others.pdf

653-KOL-2006-REPLY TO EXAMINATION REPORT 1.2.pdf

653-kol-2006-reply to examination report-1.1.pdf

653-kol-2006-reply to examination report.pdf