EP1667797A1 - Improved acceleration nozzle for gas-solids suspension - Google Patents
Improved acceleration nozzle for gas-solids suspensionInfo
- Publication number
- EP1667797A1 EP1667797A1 EP03818693A EP03818693A EP1667797A1 EP 1667797 A1 EP1667797 A1 EP 1667797A1 EP 03818693 A EP03818693 A EP 03818693A EP 03818693 A EP03818693 A EP 03818693A EP 1667797 A1 EP1667797 A1 EP 1667797A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- acceleration nozzle
- acceleration
- gas outlet
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/06—Jet mills
- B02C19/065—Jet mills of the opposed-jet type
Definitions
- a tubular nozzle is used, the inside diameter of which is either throughout of the same size, or if higher speeds are aimed at, on the output side slightly tapering and on the inlet side slightly expanding.
- the content of solids of the gas-solids suspension must be relatively low. Therefore, quite a great lot of gas gets into the pulverizing chamber, which partly disturbs the actual pulverizing. In principle the pulverizing procedure needs no working gas. A part of working gas can be removed, after the particles in the nozzle have reached their optimum speed. So it would be desirable to find a means for steering the excess gas out before the pulverizing zone.
- the tapering of the flow channel of the head and at the same time the beginnings of the gas outlet channels are advantageously in the central area of the head.
- the flow channel tapers advantageously so that the decrease of its cross-section corresponds at least the to total cross-section of the inlets of the gas outlet channels and is about 20° of the cross-section of the beginning of the of the head flow channel.
- the length of the tapering head from the inlet hole of the gas inlet channels to the outlet of the head must be chosen mainly on the basis of consistency and properties of the material to get ground. If the pulverizing material is very light and fine the length of the tapering portion must be very short, while the material to be ground is of more coarse and heavier quality, the tapering part can be relatively long.
- a part of working gas gets out from the accelerating nozzles throughout said gas outlet channels so that they do not cause opposite disturbing gas flows in the pulverizing zone itself Due to the outlet gas channel the heads of nozzles can be taken quite close to each other without notable growth of back pressure. Due to these gas outlet channels less air comes to the collision area, which also has effect on that the exit of particles from the collision area slows causing the particles a pulverizing an impact more effect and longer pulverizing duration.
- the pulverizing chamber of the counterjet pulverizer is advisedly cylindrical as to its cross-section, in the one or both ends end of which there is the outlet of ground gas- solids suspension and the nozzles reach through the cylinder mantle.
- FIG. 4 shows the second embodiment of the pulverizing and the classification part of the counterjet pulverizer, the pulverizing chamber seen from the side and cut along the axis of the acceleration nozzles.
- acceleration nozzle 1 according to the invention is formed of a conventional nozzle 1, in the outlet end of which a tubular head 2 is arranged, the flow channel of which is at least as to its end portion tapering the flow direction and that in the wall of head 2, at the beginning of the tapering, several gas outlets 4 are made reaching diagonally from middle axis A of flow channel 3 to the outside. Gas outlets 4 are advantageously placed at regular intervals side by side in circular order so that the excess gas gets off nozzle 1, 2 evenly almost from the same place in the nozzle lengthwise direction.
- each gas outlet channel 4 forms an angle of about of 45° with middle axis A of the flow channel.
- Gas outlet channel 4 can as to its cross-section be circular or rectangular, and it can as to its cross-section be either throughout of the same size or as to its end portion extending as per figure 1.
- a thick spacer plate 6 is installed between the outlet ends of both acceleration nozzles 1,2 and at a distance from both of them so that pulverizing chamber 5 is partly divided into two sections.
- spacer plate 6 in front of both acceleration nozzles 1,2 a passing opening 7 is made, mainly as big as the outer circle of acceleration nozzles 1,2, which opening forms a pulverizing zone protected against disturbing gas flows.
- a notable amount of the gas from the outlet acceleration nozzle 1,2 leaves through the gap between head 2 of both acceleration nozzles and spacer plate 6, the width advantageously adjustable according to the material to be pulverized in changing the distance between heads 2 of acceleration nozzles 1.
- cylindrical pulverizing part 5 of the counterjet pulverizer according to figure 4 a cylindrical partition wall 6a is arranged concentrically, the other end of which is closed. Heads 2 of acceleration nozzles 1 protrude into pulverizing part 7a, formed inside this partition wall 6a, so much, that outlets 4 get outside this partition wall 6a so that the gas- fines suspension removed from acceleration nozzles 1,2 through gas out lets 4 gets into the space outside partition wall 6a of pulverizing part 5, from where it has to be removed as a separate flow D, whereas the gas suspension of ground material is removed from pulverizing part 7a in direction of arrow C for further processing. Accordingly, in this pulverizing chamber preliminary classification takes place at the same time. By control of the pressure outside partition wall 6a in pulverizing chamber 5 it is possible at the same time to adjust from acceleration nozzles 1,2 the portion of removing gas-fines of the total amount of gas-solids suspension fed through acceleration nozzles 1,2.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FI2003/000685 WO2005028115A1 (en) | 2003-09-19 | 2003-09-19 | Improved acceleration nozzle for gas-solids suspension |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1667797A1 true EP1667797A1 (en) | 2006-06-14 |
EP1667797B1 EP1667797B1 (en) | 2011-05-25 |
Family
ID=34355287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03818693A Expired - Lifetime EP1667797B1 (en) | 2003-09-19 | 2003-09-19 | Improved acceleration nozzle for gas-solids suspension |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1667797B1 (en) |
AT (1) | ATE510626T1 (en) |
AU (1) | AU2003262609A1 (en) |
WO (1) | WO2005028115A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2619880A1 (en) * | 1976-05-05 | 1977-11-24 | Gvnii Zementnoj Promy Niizemen | Solids injector for jet grinding unit - with an accelerating section comprising a cylindrical zone and one or more conical-shaped zones |
FI74222C (en) | 1985-09-18 | 1988-01-11 | Finnpulva Ab Oy | KVARNHUS FOER TRYCKAMMARKVARN. |
JPH03138084A (en) * | 1989-10-23 | 1991-06-12 | Brother Ind Ltd | Plasma cutting device |
FI86514C (en) * | 1990-12-19 | 1992-09-10 | Finnpulva Ab Oy | Mill chamber for a counter-jet mill |
US6138931A (en) * | 1999-07-27 | 2000-10-31 | Xerox Corporation | Apparatus and method for grinding particulate material |
DE10116483B4 (en) * | 2001-04-03 | 2006-08-17 | Josef Fischer | Device for crushing bulk material |
-
2003
- 2003-09-19 EP EP03818693A patent/EP1667797B1/en not_active Expired - Lifetime
- 2003-09-19 WO PCT/FI2003/000685 patent/WO2005028115A1/en active Application Filing
- 2003-09-19 AU AU2003262609A patent/AU2003262609A1/en not_active Abandoned
- 2003-09-19 AT AT03818693T patent/ATE510626T1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2005028115A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1667797B1 (en) | 2011-05-25 |
AU2003262609A1 (en) | 2005-04-11 |
WO2005028115A1 (en) | 2005-03-31 |
ATE510626T1 (en) | 2011-06-15 |
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