EP0118455A1 - Pulverized solid fuel burning apparatus. - Google Patents
Pulverized solid fuel burning apparatus.Info
- Publication number
- EP0118455A1 EP0118455A1 EP83901967A EP83901967A EP0118455A1 EP 0118455 A1 EP0118455 A1 EP 0118455A1 EP 83901967 A EP83901967 A EP 83901967A EP 83901967 A EP83901967 A EP 83901967A EP 0118455 A1 EP0118455 A1 EP 0118455A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- firing
- conduit
- ignition chamber
- solid fuel
- burner
- 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
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
- B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
Definitions
- the invention is concerned with systems and methods for pulverizing solid fuels, such as coal or other fossil fuels, and for burning such pulverized fuels suspended in a stream of air.
- burner systems for large industrial furnaces have been developed to burn pulverized coal fed from grinding mills using air as a
- Pulverizing and burning systems are normally equipped with coal-drying equipment in advance of feed to the pulverizing ⁇ 5 mill or at least the carrier air is preheated.
- Burners for pulverized solid fuels suspended in air have, in some instances, utilized a conical deflector rigidly mounted in a predetermined fixed position at the discharge end of and extending downstream from the firing conduit of the burner.
- Pulverizers utilizing a staged impeller for impacting friable solid material to be ground and for throwing the impacted material outwardly against other stationary impacting members in an environment of turbulent air flow which promotes autogenous attrition of solid particles are well known in the pulverizing of materials such as lithopone, titanium oxide, cocoa, sulfur, talc and the like in instances where impalpable powders of five micron size or less are desired.
- materials such as lithopone, titanium oxide, cocoa, sulfur, talc and the like in instances where impalpable powders of five micron size or less are desired.
- Primary objectives in the making of the present invention were to provide for effective pulverization of even wet coal in a system for pulverizing and burning solid fuels, principally in connection with industrial furnaces such as those used to heat gypsum-processing kettles and steam boilers, and in connection with rotary kilns and metallurgical furnaces; to enable use of ambient air as the carrier in contrast to the usual preheated air, and to accomplish effective drying of the wet material by means of heat generated internally of the pulverizer; to provide for substantially instantaneous ignition of the pulverized fuel in the burner and rapid heating to operating temperature for effective flame propagation; to provide for much higher turndown ratios than possible with presently available equipment; to provide for easily obtaining desired flame shapes for particular purposes; and to provide for optimum overall operation of such a system by utilizing observation of firing conditions in the ignition chamber of the burner to govern firing conditions.
- the invention eliminates or substantially alleviates disadvantages of present solid fuel pulverizing and burning systems and provides for turndown ratios of fifteen to one or higher, as contrasted with the three to one of presently available equipment.
- the burner of the invention has valved, fuel-firing nozzle means, preferably in the form of a movably positioned, double-taper-ended valve element at the discharge end of a firing conduit for the pulverized solid fuel and in line with stream flow therethrough to create turbulence and control the quantity of the stream of air-suspended, pulverized, solid fuel fired into the ignition chamber of a furnace and the shape and character of the resulting flame.
- the quantity and velocity of fuel passed to the burner is largely controlled by the amounts of air and solid fuel material fed to the pulverizer.
- the pulverizer is unique in the drying action exerted on the solid fuel as it is being pulverized internally of the pulverizer by the inherent operating conditions therein.
- Setting of the burner valve is determined for maximum operative effectiveness under actual operating conditions by observation of such operating conditions.
- Substantially instantaneous ignition is achieved on the basis of an initial valve setting in conjunction with a fluid-fueled pilot igniter, and rapid flame propagation is insured by reason of a heat retaining and reflecting ignition chamber of refractory material, which, in accordance with the invention, is cast to form as an integral block and through which flame-observation peep holes extend from the front of the burner. Observation of flame characteristics enable setting of the valve for optimum operation.
- the pulverized coal may be consumed at selected rates, and the plume of flame may have a wide range of shapes and sizes and may have oxidizing or reducing characteristcs and temperatures to met the requirements of various industrial processing or space heating uses.
- FIG. 1 is a fragmentary top plan view of an installation of a coal pulverizing and burning system of the invention in connection with a gypsum- processing kettle;
- Fig. 2 a front elevation of the system of Fig. 1;
- Fig. 3 a vertical section partly in elevation as taken on the line 3-3 of Fig. 1;
- Fig. 4 a fragmentary, axial, vertical section through the burner portion of the system as taken on the line 4-4 of Fig. 2 and drawn to a larger scale;
- Fig. 5 a vertical section taken on the line 5-5 of Fig. 4;
- FIG. 6 a vertical section taken on the line 6-6 of Fig. 4j
- Fig. 7 a vertical section taken on the line 7-7 of Fig. 4;
- Fig. 8 a vertical section through the pulverizer portion of the system as taken on the line 8-8 of Fig. 3 and drawn to a larger scale;
- Fig. 9 a horizontal section through the respective coal and air inlet conduits of the pulverizer portion of the system as taken on the line 9-9 of Fig. 3;
- Fig. 10 a horizontal section through the pulverizer portion of the system as taken on the line 10-10 of Fig. 8;
- Fig. 11 a similar horizontal section as taken on the line 11-11 of Fig. 8; and Fig. 12, a similar horizontal section as taken on the line 12-12 of Fig. 8, hidden portions below being shown by broken lines.
- the system of the invention is applied to the usual furnace portion 10, Figs. 1 and 3, of a conventional gypsum processing kettle 11, enabling such furnace to be fired with finely pulverized coal, about eighty percent of which is of forty micron particle size and all of which will pass a standard two hundred mesh screen.
- Pulverized coal of this fineness is supplied on a continuous basis by a pulverizer 12 through a conduit 13 to a burner 14 attached to a forwardly protruding part 10a of the furance 10 by means of a plate 14a which may or may not be provided as a part of burner 14.
- a blower 15 supplies ambient
- Ambient primary air is supplied to pulverizer 12 through a conduit 17, Fig. 3, and run-of-the-mine coal (maximum size about two inches) is supplied through a conduit 18.
- Tertiary air for helping to support combustion at and beyond the burner may be supplied through a series of openings 19, Figs. 2, 3, and 4, provided in the front of the furnace circumf erentially of the burner proper.
- the pulverizer component of the present system is unique in a system of this kind in that, although machine impact is a factor, fineness of grind is achieved largely autogenously under drying conditions by particle-to-particle attrition.
- the downdraft pulverizer 12 herein specifically illustrated and described is believed to be new in and of itself and is claimed herein per se as a subcombination. However, other pulverizers of this general kind can be employed in this system so long as they perform in accordance with the teachings hereof.
- down-draft pulverizer 12 The details of down-draft pulverizer 12 are shown in Figs. 8-12.
- a diametrically split, cylindrical housing 20, having bottom and top walls 21 and 22, respectively, is supported in vertical position by a stand 23.
- the two semi-circular sections of such housing are secured together by means of outwardly projecting flanges 20a and bolts 20b.
- Journaled in the bottom and top walls by bearings 24 and 25 are opposite ends, respectively, of a rotatable impeller shaft 26 to which are affixed, in mutually spaced relationship, a series of impellers 27, 28, 29, 30, and 31 representing successive pulverizing stages from the upper inlet end of the housing to the lower discharge end thereof.
- the impellers are preferably all imperforate, circular plates of uniform diameter, leaving respective, relatively narrow, annular spaces 32 between their circumferences and the inside cylindrical wall of the housing. They are mounted on shaft 26 by means of respective splined collars 33 and set screws (not shown).
- a series of horizontal, annular partitions 34 extend inwardly between mutually adjacent impellers of respective sets of same from circumferential securement to the inside face of housing 20, to direct flow toward the impeller axis in opposition to centrifugal force exerted by the impellers.
- the impellers are spaced from the respective partitions 34 to provide flow passages 35 therebetween as continuations of the annular spaces 32.
- An electric motor 36 supported from housing 20 by bracket 37 drives impeller shaft 26 through a belt and pulley drive 38.
- Uppermost impeller 27 has four radial bars 27a dividing the upper surface of its plate into quarter sections, as illustrated in Fig. 10. Bars 27a extend from the circumference of the plate inwardly toward, but short of, its 0 collar 33 so as to leave an annular space 39 surrounding the collar.
- This impeller is designed to receive, mix and distribute inflowing air and coal, as well as to shatter coal pieces by impact of the bars 27a thereagainst and by impact of the coal pieces against the housing wall and against each other as they are thrown outwardly by centrifugal force.
- 5 Inlet openings 40 and 41, Fig. 9, are provided through top wall 22 of housing 20 for connection with respective supply conduits 42 and 43, Fig. 3.
- One is for the supply of ambient primary air, the other for the supply of run- of-the-mine coal or other solid fuel which may be utilized in any given instance. They are preferably provided at diametrically opposite sides of impeller shaft 26. For best distribution of the air entering through its opening, such opening is preferably elongate rectangular in shape, with the longitudinal sides concavely curved toward the impeller axis, as illustrated in Fig. 9. Since it is desirable that the primary air and fuel supplies be interchangeable, both of the openings and conduits leading thereinto are ⁇ > preferably identical. Where, as here, the opening 41 and supply conduit 43 are used to supply the solid fuel, deflector skirts 44 may be provided to reduce the size of the fuel inlet opening relative to that for the air.
- Solid fuel is conveyed to its supply conduit through a tramp iron detector (not shown) to avoid damage to the pulverizer.
- a tramp iron detector (not shown) to avoid damage to the pulverizer.
- the spacings between the several impellers may be uniform, but in the illustrated instance are varied as shown in Fig. 8.
- Second stage impeller 28 has six radial bars 28 a, Fig. 11, instead of four, and impellers 29 and 30 of the third and fourth stages have four bars each, 29a and 30a, respectively, Fig. 8, the same as impeller 27 of the first stage.
- the fifth, Le. final, stage effects discharge of the pulverized solid fuel suspended in air through a tangential discharge conduit 45, Fig. 12, which is connected by conduit 13 to burner 14.
- Impeller 31 of such fifth stage has four relatively thin and tall, air motivating vanes 31a placed radially on the upper surface of its imperforate plate similarly to but instead of the thicker and lower impact bars of the other impellers.
- vanes 31a extends over much of the height of the discharge outlet so as to sweep the pulverized fuel and carrier air therethrough.
- the inside cylindrical walls of housing 20 are preferably covered by a thick ceramic lining 46 to resist abrasion and consequent wear, as well as to aid in pulverization, and there are preferably provided mutually spaced, vertical, impact bars 47 secured to such inside cylindrical walls and projecting into the annular spaces 32 of stages second through fi th.
- a downwardly-turned lip 34a is preferably provided as an addition to the uppermost annular partition 34.
- the turbulent air and solid fuel particle mix is funneled from the first stage onto the second stage, where it comes under the influence of a greater number of activating bars than in the first stage and then follows a sinuous or serpentine course as it passes through the several succeeding stages.
- Burner 14 as here illustrated, Figs. 4-7, comprises a firing nozzle which includes a firing conduit 48, connected at one end to conduit 13 leading from pulverizer 12 and having a firing orifice 49 at the downstream end.
- Such firing orifice is advantageously defined by an inturned lip 48a sloping downstream, so as to direct the outflowing stream of carrier air and suspended solid fuel particles against a valve element 50, which is preferably double-taper-ended, as at 50a and 50b, and positioned in-line with flow of
- OMPI material to impart maximum turbulence to the emerging stream.
- the angles of the tapered ends of the valve element may be varied for particular applications.
- Valve element 50 is secured to one end of an operating rod 51, which extends backwardly through firing conduit 48 and outwardly thereof through a packing gland 51a in the wall of an elbow 52 in the conduit.
- a handle 51b on the exposed end of rod 51 provides for convenient manipulation in either pushing or pulling such rod to position valve element 50 either farther away from or closer to firing orifice 49 to change flame shape for particular purposes and to otherwise control operating characteristics.
- a set screw 51c provides for locking valve element 50 in adjusted position.
- Operating rod 51 is slidably supported by mutually spaced spiders 53 within firing conduit 48, which have vanes 53a angled to impart swirl to the stream of carrier air and suspended solid fuel particles.
- Concentric with and surrounding firing conduit 48 is a secondary air conduit 54 extending in cantilever fashion from securement to burner plate 14a and having conduit 16 connected in flow, communication therewith.
- the downstream end, Le. firing orifice 49, of conduit 48 and the downstream end 54a of conduit 54 open into an ignition chamber 55 of the burner, which is defined by heat retaining and reflecting refractory material 56, to provide a divergent inlet portion 55a in which valve element is positioned, and a discharge portion 55b of uniform diameter.
- Such material is advantageously a commercial refractory produced in powder form under the proprietary name of "Krusite" by A. P. Green Refractories Co., and is mixed with water and cast into final form as an integral block.
- Firing conduit 48 is slidable within and along secondary air conduit 54 to place firing orifice 49 at variable distances from, or right at, the downstream end of secondary air conduit 54.
- a section of flexible pipe 57 in conduit 13 accommodates the movement of the firing conduit, and a set screw 58 provides for locking it in its adjusted position.
- the flow velocity in firing conduit 48 is sufficient to suspend enough pulverized coal particles to render the primary mixture in such conduit too fuel-rich for effective eombusion, or at least sufficiently rich in coal particle content relative to air content for a low flame propagation rate such as will prevent flashback.
- the weight of air in the primary mixture may range from
- a vane 59 may be pivotally mounted at the entrance of secondary air from conduit 16 into conduit 54 for selective angular orientation, so that an adjustable swirling component of velocity is imparted to the secondary air as it enters conduit 54. This swirling component persists through ignition chamber 55 to help shape the flame plume. Making use of valve 16 a, the operation may induce more pronounced swirls to aid the valved firing nozzle to produce correspondingly more full, but shorter plumes, and vice versa.
- firing conduit 48 For start-up of the furnace, the position of firing conduit 48 is first adjusted relative to secondary air conduit 54 in accordance with firing conditions, and valve element 50 is positioned about three inches from firing orifice 49. Motor 36 of pulverizer 12 and blower 15 supplying secondary air to burner 14 are energized.
- the flame from an igniter torch 60 is directed into the highly turbulent mixture of air and pulverized solid fuel in ignition chamber 55 by way of an igniting passage 61, which extends from the front of the burner through plate 14a and the block of refractory material 56 and opens into the ignition chamber. Ignition should take place instantaneously.
- torch 60 is kept burning for about five minutes while the refractory material 56 is being brought to operating temperature and during observation of flame propagation. In the present instance, observation is carried out manually through peep passages 62, Fig. 4, which, like igniting passage 61, extend from the front of the burner through plate 14a and the block of refractory material 56 to open into ignition chamber 55.
- valve element 50 is established by movement thereof from its initial position either toward or away from nozzle firing orifice 49.
- firing conduit 48 it is not usually necessary to readjust the position of firing conduit 48 to relocate its firing orifice 49 relative to the annular discharge orifice of secondary air conduit 54 at its end 54a, that can be done if found expedient in order to establish optimum conditions for flame propagation in and beyond ignition chamber 55.
- refractory block 56 becomes heated to a temperature of from about 2000 to 3000° F, and serves as a continuing source of ignition heat for the fuel feed to the burner.
- valve element 50 is positioned, as previously indicated, by manipulation of rod 51 to adjust flow of the primary fuel mixture into the ignition chamber.
- the supply of secondary air is then adjusted by means of valve 16 a for the desired coal to air ratio.
- the combustion energy provided by the system is controlled and maintained by input of fuel and air.
- the operator usually first adjusts the flame in this manner and then makes whatever further adjustments therein and to the setting of vane 59 and to valve 16a that may be required to modify flame swirl to achieve shape of flame plume suitable for the particular application. If necessary, he may analyze the furnace exhaust gases to determine the oxidizing or reducing character of the flame.
- the capability of the burner of the invention to accommodate large variations in coal consumption for achieving various desired results in the operation of a furnace or boiler is believed to come largely from thorough mixing of pulverized coal and air in both the pulverizer and the firing nozzle of the burner and by the reliability of continuing ignition.
- Coal feed rates to the burner can be successfully adjusted over a turndown range of 15:1, or higher, with stable combustion and without flameout or flashback.
- the shape, temperature, and oxidizing or reducing potential of the flame plume may be varied widely and controlled closely.
- the shorter, more expansive plume preferred for boiler heating is readily achieved with the lower coal firing rates, the flow of secondary air being adjusted for relatively rapid combustion.
- the longer plume preferred in industrial process furnaces is achieved with higher coal firing rates.
- the firing conduit 48 of the firing nozzle may be four inches in diameter, rec ⁇ rculat ⁇ on conduit 54 six inches in diameter, firing orifice 49 three and one-half inches in diameter, portion 55b of ignition chamber 55 fourteen inches in diameter, and the overall length of the ignition chamber twenty-four inches.
- the firing nozzle may incorporate manifolding to accommodate two or more burners simultaneously utilizing a single pulverizer, or more than one firing nozzle may be served by a single pulverizer.
- an ultraviolet scanner such as a Honeywell "Mini Peeper", No. C7027A-1023, is installed in each passage 62.
Abstract
Un système de pulvérisation et de combustion de combustible solide, tel du charbon ou autres combustibles fossiles, se caractérisant par un rapport d'atténuation possible allant au moins jusqu'à 1 à 15, comprend un pulvérisateur unique (12) pouvant exécuter une pulvérisation aussi bien autogène que par impact, et un brûleur unique (14) comprenant un ajutage de mise à feu à soupape possédant une conduite de mise à feu (48) pourvue d'un orifice de mise à feu (49) et d'une alimentation réglable d'air secondaire (16, 16a, 54, 59). Un élément de vanne mobile (50), ayant de préférence la forme d'un corps à extrémité biconique, disposé en aval de l'orifice de mise à feu (49), fait passer un courant turbulent d'air primaire et secondaire mélangé, dans lequel sont suspendues des particules de combustible pulvérisé, dans une chambre d'allumage (55) et règle la forme de la flamme.A system for spraying and combustion of solid fuel, such as coal or other fossil fuels, characterized by a possible attenuation ratio of at least up to 1 to 15, comprises a single sprayer (12) capable of performing spraying also well autogenous than impact, and a single burner (14) comprising a valve firing nozzle having a firing line (48) provided with a firing orifice (49) and an adjustable supply secondary air (16, 16a, 54, 59). A movable valve element (50), preferably in the form of a body with a biconical end, arranged downstream of the firing orifice (49), passes a turbulent stream of mixed primary and secondary air, in which pulverized fuel particles are suspended, in an ignition chamber (55) and regulates the shape of the flame.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37834782A | 1982-05-14 | 1982-05-14 | |
US378347 | 1995-01-25 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0118455A1 true EP0118455A1 (en) | 1984-09-19 |
EP0118455A4 EP0118455A4 (en) | 1985-07-30 |
EP0118455B1 EP0118455B1 (en) | 1987-06-03 |
Family
ID=23492768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83901967A Expired EP0118455B1 (en) | 1982-05-14 | 1983-04-11 | Pulverized solid fuel burning apparatus |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0118455B1 (en) |
KR (1) | KR910006233B1 (en) |
AU (3) | AU566176B2 (en) |
CA (1) | CA1203435A (en) |
DE (1) | DE3371938D1 (en) |
WO (1) | WO1983004085A1 (en) |
ZA (1) | ZA833054B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4734960A (en) * | 1984-05-03 | 1988-04-05 | Bougard Jacques L | Equipment for direct fuel firing |
DE4302430A1 (en) * | 1993-01-29 | 1994-08-04 | Dkm Deutsche Kohle Marketing | Process for energy generation from solid fuels and combination burners |
US9039407B2 (en) | 2006-11-17 | 2015-05-26 | James K. McKnight | Powdered fuel conversion systems and methods |
JP2010510469A (en) | 2006-11-17 | 2010-04-02 | サマーヒル バイオマス システムズ インコーポレイテッド | Powdered fuel, powdered fuel dispersion, and powdered fuel related combustion devices |
CA2720970A1 (en) * | 2008-04-07 | 2009-10-15 | James K. Mcknight | Powdered fuel conversion systems and methods |
WO2015069784A1 (en) * | 2013-11-08 | 2015-05-14 | Zheng Shi | Adjusting the flame characteristic within a combustor |
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DE364C (en) * | 1877-09-05 | C. MEHLER, Maschinenfabrikant in Aachen | Crushing machine for ores, stones and the like | |
FR589749A (en) * | 1924-02-09 | 1925-06-04 | Pulverizer for pulverized coal installations | |
US1676511A (en) * | 1926-02-01 | 1928-07-10 | Int Comb Eng Corp | Pulverized-fuel burner |
US1713297A (en) * | 1928-03-26 | 1929-05-14 | Olston Otto | Centrifugal air-float pulverizer |
US1721879A (en) * | 1928-11-20 | 1929-07-23 | Hazlehurst Henry Edward | Pulverized fuel burner |
GB329963A (en) * | 1929-02-27 | 1930-05-27 | John Graves Mckean | Improvements in and relating to fronts for furnaces |
GB317710A (en) * | 1928-08-18 | 1930-10-30 | George Francis Pettinos | Improvements in grinding mills |
GB352516A (en) * | 1930-02-12 | 1931-07-13 | Arthur Docking | Improvements in or relating to powdered fuel burners |
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GB1086519A (en) * | 1964-04-25 | 1967-10-11 | Steinmueller Gmbh L & C | Improvements relating to pulverized coal firing systems |
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FR2348438A1 (en) * | 1976-04-16 | 1977-11-10 | Colmant Cuvelier | Burner for powdery fuel - has coaxial air and fuel passages injecting into cylindrical chamber with conical ends |
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US1541903A (en) * | 1924-04-25 | 1925-06-16 | Raymond Brothers Impact Pulver | Means for pulverizing, feeding, and burning fuel |
US2392331A (en) * | 1940-11-27 | 1946-01-08 | Henry G Lykken | Pulverizing and classifying machine |
US2440285A (en) * | 1943-04-28 | 1948-04-27 | Henry G Lykken | Pulverizing and classifying machine having a rotor comprising superimposed sections |
US2497088A (en) * | 1943-08-17 | 1950-02-14 | Henry G Lykken | Vortical classifying machine |
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US4173189A (en) * | 1977-01-21 | 1979-11-06 | Combustion Engineering, Inc. | Boiler cold start using pulverized coal in ignitor burners |
US4221174A (en) | 1978-05-16 | 1980-09-09 | Combustion Engineering, Inc. | Direct ignition of a fluctuating fuel stream |
US4318355A (en) * | 1979-09-12 | 1982-03-09 | Nelson Wilbert K | Burner structure for particulate fuels |
US4241673A (en) * | 1979-11-05 | 1980-12-30 | Combustion Engineering, Inc. | Direct ignition of pulverized coal |
US4321034A (en) * | 1980-04-03 | 1982-03-23 | Clearfield Machine Company | Coal burners, rotary furnaces incorporating the same and methods of operating |
-
1983
- 1983-04-11 DE DE8383901967T patent/DE3371938D1/en not_active Expired
- 1983-04-11 AU AU16049/83A patent/AU566176B2/en not_active Expired
- 1983-04-11 EP EP83901967A patent/EP0118455B1/en not_active Expired
- 1983-04-11 WO PCT/US1983/000570 patent/WO1983004085A1/en active IP Right Grant
- 1983-04-25 CA CA000426626A patent/CA1203435A/en not_active Expired
- 1983-04-29 ZA ZA833054A patent/ZA833054B/en unknown
- 1983-05-13 KR KR1019830002080A patent/KR910006233B1/en not_active IP Right Cessation
-
1987
- 1987-08-18 AU AU77153/87A patent/AU601469B2/en not_active Expired
- 1987-08-18 AU AU77154/87A patent/AU601470B2/en not_active Expired
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Publication number | Priority date | Publication date | Assignee | Title |
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DE364C (en) * | 1877-09-05 | C. MEHLER, Maschinenfabrikant in Aachen | Crushing machine for ores, stones and the like | |
FR589749A (en) * | 1924-02-09 | 1925-06-04 | Pulverizer for pulverized coal installations | |
US1676511A (en) * | 1926-02-01 | 1928-07-10 | Int Comb Eng Corp | Pulverized-fuel burner |
US1841587A (en) * | 1927-12-03 | 1932-01-19 | Drake Non Clinkering Furnace B | Combustion of pulverized or similar fuel |
US1713297A (en) * | 1928-03-26 | 1929-05-14 | Olston Otto | Centrifugal air-float pulverizer |
GB317710A (en) * | 1928-08-18 | 1930-10-30 | George Francis Pettinos | Improvements in grinding mills |
US1721879A (en) * | 1928-11-20 | 1929-07-23 | Hazlehurst Henry Edward | Pulverized fuel burner |
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GB795887A (en) * | 1954-07-26 | 1958-06-04 | Bayer Ag | Method of and device for burning fuels |
GB1086519A (en) * | 1964-04-25 | 1967-10-11 | Steinmueller Gmbh L & C | Improvements relating to pulverized coal firing systems |
US3934522A (en) * | 1974-11-01 | 1976-01-27 | The Detroit Edison Company | Coal burning system |
FR2348438A1 (en) * | 1976-04-16 | 1977-11-10 | Colmant Cuvelier | Burner for powdery fuel - has coaxial air and fuel passages injecting into cylindrical chamber with conical ends |
Non-Patent Citations (1)
Title |
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See also references of WO8304085A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU601470B2 (en) | 1990-09-13 |
KR910006233B1 (en) | 1991-08-17 |
EP0118455B1 (en) | 1987-06-03 |
ZA833054B (en) | 1984-01-25 |
AU566176B2 (en) | 1987-10-08 |
WO1983004085A1 (en) | 1983-11-24 |
AU7715487A (en) | 1987-11-26 |
CA1203435A (en) | 1986-04-22 |
DE3371938D1 (en) | 1987-07-09 |
EP0118455A4 (en) | 1985-07-30 |
AU1604983A (en) | 1983-12-02 |
AU601469B2 (en) | 1990-09-13 |
AU7715387A (en) | 1987-11-26 |
KR840004566A (en) | 1984-10-22 |
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