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WO1983004085A1 - Bruleur de combustible solide pulverise - Google Patents

Bruleur de combustible solide pulverise Download PDF

Info

Publication number
WO1983004085A1
WO1983004085A1 PCT/US1983/000570 US8300570W WO8304085A1 WO 1983004085 A1 WO1983004085 A1 WO 1983004085A1 US 8300570 W US8300570 W US 8300570W WO 8304085 A1 WO8304085 A1 WO 8304085A1
Authority
WO
WIPO (PCT)
Prior art keywords
firing
conduit
ignition chamber
burner
solid fuel
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.)
Ceased
Application number
PCT/US1983/000570
Other languages
English (en)
Inventor
William H. Sayler
Justin Chad White
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tas Inc
T A S Inc
Original Assignee
Tas Inc
T A S Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tas Inc, T A S Inc filed Critical Tas Inc
Priority to JP58501978A priority Critical patent/JPS59500830A/ja
Priority to DE8383901967T priority patent/DE3371938D1/de
Publication of WO1983004085A1 publication Critical patent/WO1983004085A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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 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. 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;
  • 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.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

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.
PCT/US1983/000570 1982-05-14 1983-04-11 Bruleur de combustible solide pulverise Ceased WO1983004085A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP58501978A JPS59500830A (ja) 1982-05-14 1983-04-11 固体燃料粉砕／燃焼システム
DE8383901967T DE3371938D1 (en) 1982-05-14 1983-04-11 Pulverized solid fuel burning apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37834782A 1982-05-14 1982-05-14
US378,347 1982-05-14

Publications (1)

Publication Number Publication Date
WO1983004085A1 true WO1983004085A1 (fr) 1983-11-24

Family

ID=23492768

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1983/000570 Ceased WO1983004085A1 (fr) 1982-05-14 1983-04-11 Bruleur de combustible solide pulverise

Country Status (7)

Country Link
EP (1) EP0118455B1 (fr)
KR (1) KR910006233B1 (fr)
AU (3) AU566176B2 (fr)
CA (1) CA1203435A (fr)
DE (1) DE3371938D1 (fr)
WO (1) WO1983004085A1 (fr)
ZA (1) ZA833054B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165224A1 (fr) * 1984-05-03 1985-12-18 Jacques Léopold Bougard Equipement de chauffe directe
EP0608691A1 (fr) * 1993-01-29 1994-08-03 DKM DEUTSCHE KOHLE MARKETING GmbH Procédé pour la production d'énergie à partir de combustibles solides et brûleur mixte pour différents combustibles
WO2009126660A3 (fr) * 2008-04-07 2010-01-07 Mcknight James K Systèmes et procédés de conversion de combustible en poudre
US8100095B2 (en) 2006-11-17 2012-01-24 Mcknight James K Combustion devices for powdered fuels and powdered fuel dispersions
WO2015069784A1 (fr) * 2013-11-08 2015-05-14 Zheng Shi Ajustement de la caractéristique de flamme à l'intérieur d'une chambre de combustion
US9039407B2 (en) 2006-11-17 2015-05-26 James K. McKnight Powdered fuel conversion systems and methods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025172620A1 (fr) * 2024-02-17 2025-08-21 Laraqui Driss Système et procédé de combustion de particules métalliques pour application à la production de chaleur décarbonée

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1541903A (en) * 1924-04-25 1925-06-16 Raymond Brothers Impact Pulver Means for pulverizing, feeding, and burning fuel
US1676511A (en) 1926-02-01 1928-07-10 Int Comb Eng Corp Pulverized-fuel burner
GB329963A (en) 1929-02-27 1930-05-27 John Graves Mckean Improvements in and relating to fronts for furnaces
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
US2561388A (en) * 1945-08-20 1951-07-24 Microcyclomat Co Classifier units for friable material pulverizers
US2561564A (en) * 1948-08-23 1951-07-24 Comb Eng Superheater Inc Pulverizing mill separator, having whizzer and directional vanes
GB795887A (en) 1954-07-26 1958-06-04 Bayer Ag Method of and device for burning fuels
US3065919A (en) * 1960-09-06 1962-11-27 Colorado Mfg & Mining Co Inc Ore concentrator
US3071330A (en) * 1958-11-18 1963-01-01 Altenburger Maschinen G M B H Apparatus for fine grinding
US3873034A (en) * 1971-12-30 1975-03-25 Chisso Corp Apparatus for producing synthetic pulp
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
US4241673A (en) * 1979-11-05 1980-12-30 Combustion Engineering, Inc. Direct ignition of pulverized coal
US4318355A (en) * 1979-09-12 1982-03-09 Nelson Wilbert K Burner structure for particulate fuels
US4321034A (en) * 1980-04-03 1982-03-23 Clearfield Machine Company Coal burners, rotary furnaces incorporating the same and methods of operating

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE364C (de) * 1877-09-05 C. MEHLER, Maschinenfabrikant in Aachen Zerkleinerungsmaschine für Erze, Steine und dergl
FR589749A (fr) * 1924-02-09 1925-06-04 Pulvérisateur pour installations de charbon pulvérisé
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
GB352516A (en) * 1930-02-12 1931-07-13 Arthur Docking Improvements in or relating to powdered fuel burners
NL6412244A (fr) * 1964-04-25 1965-10-26
US3934522A (en) * 1974-11-01 1976-01-27 The Detroit Edison Company Coal burning system
FR2348438A1 (fr) * 1976-04-16 1977-11-10 Colmant Cuvelier Bruleur pour carburant pulverulent

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1541903A (en) * 1924-04-25 1925-06-16 Raymond Brothers Impact Pulver Means for pulverizing, feeding, and burning fuel
US1676511A (en) 1926-02-01 1928-07-10 Int Comb Eng Corp Pulverized-fuel burner
GB329963A (en) 1929-02-27 1930-05-27 John Graves Mckean Improvements in and relating to fronts for furnaces
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
US2561388A (en) * 1945-08-20 1951-07-24 Microcyclomat Co Classifier units for friable material pulverizers
US2561564A (en) * 1948-08-23 1951-07-24 Comb Eng Superheater Inc Pulverizing mill separator, having whizzer and directional vanes
GB795887A (en) 1954-07-26 1958-06-04 Bayer Ag Method of and device for burning fuels
US3071330A (en) * 1958-11-18 1963-01-01 Altenburger Maschinen G M B H Apparatus for fine grinding
US3065919A (en) * 1960-09-06 1962-11-27 Colorado Mfg & Mining Co Inc Ore concentrator
US3873034A (en) * 1971-12-30 1975-03-25 Chisso Corp Apparatus for producing synthetic pulp
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0118455A4 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165224A1 (fr) * 1984-05-03 1985-12-18 Jacques Léopold Bougard Equipement de chauffe directe
EP0608691A1 (fr) * 1993-01-29 1994-08-03 DKM DEUTSCHE KOHLE MARKETING GmbH Procédé pour la production d'énergie à partir de combustibles solides et brûleur mixte pour différents combustibles
US8100095B2 (en) 2006-11-17 2012-01-24 Mcknight James K Combustion devices for powdered fuels and powdered fuel dispersions
US9016216B2 (en) 2006-11-17 2015-04-28 James K. McKnight Methods of combustion of powdered fuels and powdered fuel dispersions
US9039407B2 (en) 2006-11-17 2015-05-26 James K. McKnight Powdered fuel conversion systems and methods
US9958158B2 (en) 2006-11-17 2018-05-01 James K. McKnight Powdered fuel conversion systems
WO2009126660A3 (fr) * 2008-04-07 2010-01-07 Mcknight James K Systèmes et procédés de conversion de combustible en poudre
KR101547583B1 (ko) 2008-04-07 2015-08-27 제임스 케이 맥나이트 분말연료 전환 시스템 및 방법
WO2015069784A1 (fr) * 2013-11-08 2015-05-14 Zheng Shi Ajustement de la caractéristique de flamme à l'intérieur d'une chambre de combustion

Also Published As

Publication number Publication date
AU566176B2 (en) 1987-10-08
AU7715487A (en) 1987-11-26
ZA833054B (en) 1984-01-25
EP0118455B1 (fr) 1987-06-03
EP0118455A4 (fr) 1985-07-30
AU7715387A (en) 1987-11-26
KR910006233B1 (ko) 1991-08-17
AU1604983A (en) 1983-12-02
CA1203435A (fr) 1986-04-22
KR840004566A (ko) 1984-10-22
EP0118455A1 (fr) 1984-09-19
AU601469B2 (en) 1990-09-13
AU601470B2 (en) 1990-09-13
DE3371938D1 (en) 1987-07-09

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