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US3672812A - Fuel burner unit for mounting in a common air box - Google Patents

Fuel burner unit for mounting in a common air box Download PDF

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Publication number
US3672812A
US3672812A US93625A US3672812DA US3672812A US 3672812 A US3672812 A US 3672812A US 93625 A US93625 A US 93625A US 3672812D A US3672812D A US 3672812DA US 3672812 A US3672812 A US 3672812A
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US
United States
Prior art keywords
air
duct
burner
primary
burner unit
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.)
Expired - Lifetime
Application number
US93625A
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English (en)
Inventor
Knud Erik Bendixen
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.)
Burmeister and Wain AS
Burmeister and Wains Motorog Maskinfabrik AS
Original Assignee
Burmeister and Wains Motorog Maskinfabrik AS
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 Burmeister and Wains Motorog Maskinfabrik AS filed Critical Burmeister and Wains Motorog Maskinfabrik AS
Application granted granted Critical
Publication of US3672812A publication Critical patent/US3672812A/en
Assigned to BURMEISTER & WAIN ENERGI A/S, A COMPANY OF DENMARK reassignment BURMEISTER & WAIN ENERGI A/S, A COMPANY OF DENMARK ASSIGNS THE ENTIRE INTEREST AS OF SEPTEMBER 19, 1980 Assignors: BURMEISTER & WAIN A/S
Assigned to BURMEISTER & WAIN A/S reassignment BURMEISTER & WAIN A/S CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE MARCH 16, 1978 Assignors: B & W MOTOR A/S
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel

Definitions

  • a fuel burner unit designed to be connected to a common air supply box in parallel with one or more like burner units.
  • the burner comprises a duct system for conveying combustion air from the air box to the burner head and includes a single annular outer duct connected at its front end to the air box and at its rear end to individual inner ducts for primary and secondary combustion air, respectively.
  • the volume ratio between primary and secondary air is determined by an adjustable, but normally fixed bafile device at the rear outlet end of the outer duct.
  • the total amount of combustion air supplied to each burner is controlled by a valve device located at the inlet end of the annular outer duct.
  • the present invention relates to a fuel burner unit for boilers, furnaces and other heat exchanging apparatus, and of the type which is intended to be mounted in an air box common to several units and which has at least two parallel flow ducts for the supply of primary and secondary combustion air. It is well-known that an almost completely or essentially stoichiometric combustion is advantageous by yielding flue or exhaust gases with a low sulphur trioxide content and, thereby, permits low smoke or flue temperatures without risk of corrosion damages.
  • a fuel burner unit for boilers, furnaces and other heat exchanging apparatus and of the type which is intended to be mounted in an air box common to several units and which has at least two parallel flow ducts for the supply of primary and secondary combustion air.
  • Boilers have been constructed having a completely separate and relatively long air supply duct for each burner, i.e. without a common air box, but this represents a complicated and expensive solution from a constructional point of view and, moreover, presents difficulties with respect to the desired automatic control of the firing plant.
  • a fuel burner unit comprising an open front end and a closed rear end, duct means for supplying fuel to said burner front end, at least two parallel duct means for supplying primary and secondary combustion air, respectively, to said burner front end, an annular duct surrounding said two duct means and connected thereto at its rear end,
  • fixed air distributor means for said primary and secondary air duct means located at the rear end of said annular duct, means at the front end of said annular duct for connecting the duct to an air box common to a plurality of burner units, adjustable air valve means at said front end of said annular duct, means for measuring the air flow rate through said annular duct, and means for adjusting said air valve means in dependence upon the measured air flow rate.
  • the flow rate measuring means may be adapted to measure the difference between the static pressure at the valving means and at a location intermediate the ends of the duct, respectively, as this pressure difference depends on the air velocity in the duct and, hence, on the air flow rate.
  • a measuring chamber connected to the measuring means, which chambercommunicates with the annular duct but is otherwise closed, adjacent and downstream of the valving means at the front end of the annular duct.
  • the annular duct may be designed as a Venturi nozzle, and the static pressure intermediate the ends of the duct may be measured at the narrowest cross section of the nozzle, whereby a certain recovery of the pressure drop in the constriction of the nozzle is ensured which favourably affects the economy of operation of the burner.
  • an orifice restrictor or diaphragm may alternatively be mounted in the annular duct and the measuring means may be connected on the upstream and the downstream side of the orifice restrictor, respectively.
  • FIG. 1 shows a longitudinal section through an embodiment of the burner unit according to the invention mounted in a common air box
  • FIGS. 2 and 3 show two corresponding longitudinal sections through modified embodiments of the burner unit
  • FIG. 4 shows a cross section along the line 44 in FIG. 1,
  • FIG. 5 shows a schematic damper control
  • burner units shown in the drawings are designed for being mounted in an air box 7 common to several burner units, which box extends along a combustion chamber 15 (not shown in detail) and is provided with means (not shown) for supplying combustion air in the requisite amount thereto.
  • Each burner unit comprises a centrally located supply duct or line 16 for the fuel which may be of any type, liquid, gaseous or pulverized solid fuel.
  • a centrally located supply duct or line 16 for the fuel which may be of any type, liquid, gaseous or pulverized solid fuel.
  • the fuel line 16 In the front end of the fuel line 16, that is to say at the left-hand side of FIGS. 1, 2 and 3, there may be provided means (not shown) for distributing and/or atomizing the fuel into the combustion chamber 15. Such means may be of any known type.
  • the air necessary for the combustion of the fuel is supplied to the burner head or front end' via two separate ducts, viz a central duct 1 surrounding the supply line 16 and through which primary air is supplied, and a secondary air duct 2 surrounding the duct 1 coaxially.
  • turbulators 3 and 4 are schematically shown, which turbulators may consist of inclined or curved plates which impart a suitable rotation to the two air streams before they enter the combustion chamber through a primary air nozzle 5 and a secondary air nozzle 6, respectively.
  • the tubulators 3 and 4 may be fixed or they may be adjustable with the aid of moving means (not shown).
  • annular flow duct 9 is defined between the external wall of the burner unit and the secondary air duct 2, and the front end of the flow duct 9 communicates with the air box 7 via a conically constricted inlet 8.
  • an air distribution means in the form of an annular baifie device 10 is mounted comprising a central sleeve 17, which is guided on the wall of duct 1, and an annular baffie plate 18, the outermost edge of which is curved so as to extend into the discharge or rear end of duct 9.
  • the bafile device 10 divides the air stream coming from the duct 9 into a primary air stream which continues through the internal duct 1, and a secondary air stream flowing through duct 2, respectively.
  • the sleeve 17 may be displaceable in its longitudinal direction along the wall of the duct 1, so that it is possible to vary the ratio between the cross-sectional areas through which the air flows from duct 9 into each of the ducts 1 and 2, and hence, the mutual ratio between the volumes of primary and secondary air.
  • the battle device 10 may remain stationary since an adjustment of the said ratio normally only is required when there are significant changes in the operational conditions.
  • Duct 9 including the inlet 8 is shaped as a Venturi nozzle, and in the constricted section thereof there is an aperture 19 in the outer wall of the duct for connecting a schematically indicated differential pressure gauge 20.
  • the other measuring point of gauge 20 is constituted by a similar aperture 21 in the peripheral wall of a measuring chamber 13 which wall is closed except for the aperture 21 and is coaxial with the ducts 1, 2 and 9.
  • the chamber 13 is located closely adjacent and downstream of an annular damper or valve 14 which is mounted in the air box 7 coaxially with the burner unit and which may be displaced axially to vary the inflow cross section area of the duct inlet 8.
  • the measuring chamber 13 communicates, via one or more apertures 22 in its end wall, with the inlet 8.
  • the pressure gauge 20 senses the difference between the static pressure prevailing in the measuring chamber 13 and, hence, immediately downstream of the damper 14, and the pressure at the narrowest section of the duct 9. Consequently, the differential pressure measured will indicate the total air volume passing through duct 9 per unit of time since the cross sectional area at the measuring point 19 is known.
  • the said differential pressure which, in FIG. 1, is indicated schematically in the form of a liquid column Ap, may in a manner known per se be utilized as input signal in a control system (see FIG. 5) for continuously adjusting the damper 14 in such a way that the total volume of air supplied to each burner is kept at a predetermined value which, in turn, depends on the amount of fuel supplied via the line 16.
  • FIG. 2 corresponds, so far as important elements are concerned, to that shown in FIG. 1, and for these elements, the same reference numerals are employed as in FIG. 1.
  • FIG. 3 shows an embodiment which, like that shown in FIG. 2, is distinguished by a short structural length of the complete burner unit, but in which the total air volume supplied is measured by measuring the dilferental pressure across an orifice restrictor 12 or apertured diaphragm located in the annular duct between the inlet 8 and the bafile device 10.
  • the measuring points of the differential pressure gauge 20 are located on the downstream side of the orifice restrictor 12 and in the measuring chamber 13 described above, respectively, but the latter measuring point might also be located directly on the upstream side of the orifice restrictor in the outer wall of the annular air duct.
  • a fuel burner unit comprising an open front end and a closed rear end, duct means for supplying fuel to said burner front end, at least two parallel duct means for supplying primary and secondary combustion air, respectively, to said burner front end, an annular enclosure surrounding said two duct means, air distributor means located at the rear end of said annular enclosure to divide an incoming stream for said primary and secondary air duct means, means at the front end of said annular enclosure for connecting it to an air box, adjustable air valve means at said front end of said annular enclosure, means for measuring the air flow rate through said annular enclosure, and means for adjusting said air valve means in dependence upon the measured air fiow rate.
  • a fuel burner unit as claimed in claim 1, wherein said flow rate measuring means comprises means for sensing the difference between the static air pressure in the region of said air valve means and at a location intermediate the front and rear ends of said annular enclosure.
  • a fuel burner unit as claimed in claim 2 comprising means defining a measuring chamber located adjacent and downstream said air valve means and communicating with said annular enclosure and with said flow rate measuring means.
  • measuring chamber is annular and comprises a closed peripheral wall coaxially surrounding said duct means and having an apertured end wall facing said rear end.
  • a fuel burner unit as claimed in claim 2 comprising an apertured diaphragm located intermediate the ends of said annular enclosure, said intermediate location being situated at the downstream side of said diaphragm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Air Supply (AREA)
US93625A 1969-12-09 1970-11-30 Fuel burner unit for mounting in a common air box Expired - Lifetime US3672812A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK650769AA DK120810B (da) 1969-12-09 1969-12-09 Brænderaggregat til indbygning i en fælles luftkasse.

Publications (1)

Publication Number Publication Date
US3672812A true US3672812A (en) 1972-06-27

Family

ID=8148818

Family Applications (1)

Application Number Title Priority Date Filing Date
US93625A Expired - Lifetime US3672812A (en) 1969-12-09 1970-11-30 Fuel burner unit for mounting in a common air box

Country Status (8)

Country Link
US (1) US3672812A (no)
JP (1) JPS5018618B1 (no)
DE (1) DE2059020C3 (no)
DK (1) DK120810B (no)
FI (1) FI52000C (no)
GB (1) GB1283629A (no)
NO (1) NO128345B (no)
SE (1) SE356119B (no)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788796A (en) * 1973-05-09 1974-01-29 Babcock & Wilcox Co Fuel burner
US3796536A (en) * 1971-04-26 1974-03-12 Matsushita Electric Ind Co Ltd Liquid fuel burner
US4081233A (en) * 1975-06-19 1978-03-28 Matsushita Electric Industrial Co., Ltd. Combustion device
DE2742393A1 (de) * 1976-09-22 1978-03-30 Ishikawajima Harima Heavy Ind Brenner
US4171946A (en) * 1976-02-27 1979-10-23 Pietro Fascione Burner for combustible fluids
US4443182A (en) * 1981-11-10 1984-04-17 Hauck Manufacturing Company Burner and method
US20040003596A1 (en) * 2002-04-26 2004-01-08 Jushan Chin Fuel premixing module for gas turbine engine combustor
US20090016150A1 (en) * 2007-07-13 2009-01-15 Emile Mimran Ice cream and topping mixing attachment

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51157415U (no) * 1975-06-10 1976-12-15
JPS528019U (no) * 1975-07-02 1977-01-20
JPS5393311U (no) * 1976-12-28 1978-07-29
AU5639780A (en) * 1979-03-23 1980-09-25 Kintyre Enterprises Ltd. Fuel burner
GB2136554B (en) * 1983-03-15 1986-06-11 Volcano Company Limited Oil burner and a method of effecting combustion therein
IT1238713B (it) * 1990-04-20 1993-09-01 Ente Naz Energia Elettrica Bruciatore perfezionato per olio e gas combustibili a bassa produzione di ossidi di azoto.
JP3388792B2 (ja) * 1993-01-13 2003-03-24 新日本石油株式会社 バーナ

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796536A (en) * 1971-04-26 1974-03-12 Matsushita Electric Ind Co Ltd Liquid fuel burner
US3788796A (en) * 1973-05-09 1974-01-29 Babcock & Wilcox Co Fuel burner
US4081233A (en) * 1975-06-19 1978-03-28 Matsushita Electric Industrial Co., Ltd. Combustion device
US4171946A (en) * 1976-02-27 1979-10-23 Pietro Fascione Burner for combustible fluids
DE2742393A1 (de) * 1976-09-22 1978-03-30 Ishikawajima Harima Heavy Ind Brenner
US4443182A (en) * 1981-11-10 1984-04-17 Hauck Manufacturing Company Burner and method
US20040003596A1 (en) * 2002-04-26 2004-01-08 Jushan Chin Fuel premixing module for gas turbine engine combustor
US6968692B2 (en) * 2002-04-26 2005-11-29 Rolls-Royce Corporation Fuel premixing module for gas turbine engine combustor
US20090016150A1 (en) * 2007-07-13 2009-01-15 Emile Mimran Ice cream and topping mixing attachment

Also Published As

Publication number Publication date
FI52000B (no) 1977-01-31
SE356119B (no) 1973-05-14
DE2059020A1 (de) 1971-06-24
NO128345B (no) 1973-10-29
GB1283629A (en) 1972-08-02
DE2059020C3 (de) 1980-05-08
FI52000C (fi) 1977-05-10
JPS5018618B1 (no) 1975-07-01
DE2059020B2 (de) 1979-07-12
DK120810B (da) 1971-07-19

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