EP1136776A2 - Dispositif pour injecter des carburants solides atomisés dans un four de cimenterie - Google Patents

Dispositif pour injecter des carburants solides atomisés dans un four de cimenterie Download PDF

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Publication number
EP1136776A2
EP1136776A2 EP01200982A EP01200982A EP1136776A2 EP 1136776 A2 EP1136776 A2 EP 1136776A2 EP 01200982 A EP01200982 A EP 01200982A EP 01200982 A EP01200982 A EP 01200982A EP 1136776 A2 EP1136776 A2 EP 1136776A2
Authority
EP
European Patent Office
Prior art keywords
burner
air
solid fuel
piping
flows
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
Application number
EP01200982A
Other languages
German (de)
English (en)
Other versions
EP1136776B1 (fr
EP1136776A3 (fr
Inventor
Roberto Rizzi
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.)
Italcementi SpA
Original Assignee
Italcementi SpA
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Publication date
Application filed by Italcementi SpA filed Critical Italcementi SpA
Publication of EP1136776A2 publication Critical patent/EP1136776A2/fr
Publication of EP1136776A3 publication Critical patent/EP1136776A3/fr
Application granted granted Critical
Publication of EP1136776B1 publication Critical patent/EP1136776B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/34—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/32—Arrangement of devices for charging
    • F27B7/3205—Charging
    • F27B2007/3211—Charging at the open end of the drum
    • F27B2007/3217—Charging at the open end of the drum axially, optionally at some distance in the kiln
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners

Definitions

  • the object of the present invention is a device for injecting solid fuels into a cement kiln.
  • the device object of the invention is suitably designed for burners operating with both two fuels (solid and liquid fuels), and with three fuels (gaseous, liquid and solid fuels), in particular with different combinations of the three fossil fuels.
  • a possible solid fuel for such kilns is, for example, atomised coal.
  • nitric oxides are the most important gaseous pollutants produced during the combustion and emitted by the exhausted smokes to the environment in the different industrial production processes.
  • NO x Without going to the heart of the different (thermal, fuel and prompt) mechanisms of formation of the NO x , it is useful to note that the main formation of NO x depends on the fuel, on its nitrogen content, on the air excess, of the air pre-heating, on the flame temperature, and in cement kilns, on other typical parameters of the production process.
  • the air distribution and at first the aerodynamics along the burner axis affect the fuel fire point.
  • purpose of the present invention is that of realising a device which should allow solving the above disadvantages, thus optimising the combustion conditions.
  • a further purpose of the present invention is that of providing a burner which should be capable of guaranteeing an improved operation with respect to similar burners in terms of a further reduction of NO x emissions.
  • the device for injecting atomised solid fuels according to the invention is designed to be installed at the output mouth of a burner 11, coaxially to the central portion of the same burner 11.
  • Such central portion of burner 11 consists of a nozzle for liquid fuels 5, and of piping for injecting the solid fuel 1 and for injecting the inside air 4.
  • Figure 1 shows device 10 installed on burner 11, in turn inserted into a kiln 12 for clinker 13; there is also visible the coal injected by such burner 11.
  • device 10 relating to the present invention thus comprises an annular piping 1, which is coaxial to the liquid fuel nozzle 5.
  • the annular piping 1 has the purpose of concentrating the solid fuel dust into physically separate flows with different transport air/fuel ratios.
  • annular piping is divided into sectors 1a and 1b, which converge towards the mouth of burner 11 so as to allow the formation of alternate flows rich in solid fuel, and poor flows, as it shall be better illustrated in the following description.
  • Device 10 also exhibits a coaxial piping 2, outside the other coaxial piping, which has the purpose of shaping the flame, imparting the desired length to it, by confining the fuel flow and generating an effective and efficient inside recycle zone (which shall be indicated with the abbreviation IRZ in the following description).
  • the coaxial piping 2 can also be provided with a swirler for generating a rotational air flow.
  • Device 10 also exhibits an outside baffle 3 which actively helps to maintain the primary and secondary air flows as separate as necessary for preventing the re-entering of secondary air at high temperature in the IRZ.
  • the separation of primary and secondary air flows is sufficient for controlling the first stages of the combustion process relating to the NO x formation.
  • the inclination angle of baffle 3 can vary in the range 0° and 60° with respect to the longitudinal axis of burner 11.
  • the ratio between the greatest diameter of baffle 3 and the outside diameter of burner 11 varies in the range between 1.5 and 3.5.
  • baffle 3 As regards the length of baffle 3, it varies in the range between 100 mm and 800 mm, with respect to the profile of the mouth of burner 11, according to a plane passing through the axis of burner 11.
  • baffle 3 is a truncated cone realised and/or coated with refractory material of a suitable thickness, shape and union of the type used for coating burner 11.
  • coaxial piping 4 into burner 11 it can be provided or not according to different aspects, such as the capacity of burner 11, the type of solid fuel, the number of fuels to be used, the need of changing the shape of flame 14, and else.
  • Such coaxial piping 4 can also be provided with swirler for better performing the functionalities it is intended for.
  • the swirler of coaxial piping 2 and 4 varies from 0° to 60° with respect to the longitudinal axis of the burner in the view plane of figure 3.
  • These axial or radial flows are controlled through devices capable of ensuring a variable ratio between the two moments, guaranteeing the control of the air mixing with the fuel, and changing the flows for the purpose of generating an effective IRZ of smokes produced by the combustion.
  • the annular piping 1 consists of a group of at least 3 sectors (indicated with reference numeral 1a) converging towards the burner mouth, alternating with as many sectors, provided or not with swirler, and indicated with reference numeral 1b.
  • Such portion is sized so as to be arranged into an anulus coaxial to the burner axis and to the liquid fuel nozzle 5.
  • figure 2 shows a case with 4 sectors, provided with the coaxial piping 4.
  • the solid fuel dust is divided into various flows characterised by different local transport air/fuel ratios.
  • the transport air of the solid fuel dust feeds the device for injecting fuels with rich solid fuel flows at the periphery of the duct, and poor solid fuel flows at the centre.
  • the particular geometry of the annular piping 1 makes the rich flows enter directly into the free sectors 1a of the annular piping 1, whereas the poor ones flow - through swirler or not - into the other sectors 1b.
  • composition of the two-phase mixture in the proximity of the burner mouth depends on the features of the mixing process set by the particular aerodynamics induced by the coal nozzle, and in particular generated by the geometry of the coaxial piping 2 and 4, if present.
  • Such composition is the base parameter for controlling NO x , unburnt emissions, and the flame stability.
  • the outflow sectors of the transport air/solid fuel mixture are, at the input of device 10, substantially equivalent to 100% of the annular outlet section area, whereas the output section of the different flows varies from 100% to 50%, in function of the different industrial applications.
  • the device (figure 4) in according to the present invention consists of:
  • the operating conditions were:
  • Figure 5 shows the nitrogen oxide and free lime concentrations, as a function of the oxygen percentage at the kiln back-end, both in the case of the burner according to the present invention and of the one according to the standard low NO x design.
  • an effective and efficient flame internal recycle zone has been realised for keeping the temperature peaks under control, for reducing the time of permanence of the fuel into the air at a high temperature and producing a reducing zone or, which is the same - an excess of fuel into the ignition zone.
  • the geometry of the burner mouth has a primary importance for controlling the combustion and thus, the NO x production.
  • oxygen poor areas and fuel rich areas have been formed in the combustion zone, thus reducing the time of permanence of the fuel in the oxygen rich areas and preventing an excessive IRZ close to the burner mouth from producing local overheating phenomena which may damage the same burner.
  • the materials, shapes and sizes of the illustrated details can be of any type according to the requirements, and the same can be replaced with other technically equivalent details.
EP01200982A 2000-03-22 2001-03-16 Dispositif pour injecter des carburants solides atomisés dans un four de cimenterie Expired - Lifetime EP1136776B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI000598 2000-03-22
IT2000MI000598A IT1316825B1 (it) 2000-03-22 2000-03-22 Dispositivo per l'iniezione di combustibili solidi in formapolverizzata in un forno da cemento

Publications (3)

Publication Number Publication Date
EP1136776A2 true EP1136776A2 (fr) 2001-09-26
EP1136776A3 EP1136776A3 (fr) 2002-08-14
EP1136776B1 EP1136776B1 (fr) 2006-05-10

Family

ID=11444579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01200982A Expired - Lifetime EP1136776B1 (fr) 2000-03-22 2001-03-16 Dispositif pour injecter des carburants solides atomisés dans un four de cimenterie

Country Status (6)

Country Link
EP (1) EP1136776B1 (fr)
AT (1) ATE325997T1 (fr)
CY (1) CY1105525T1 (fr)
DE (1) DE60119417D1 (fr)
ES (1) ES2263545T3 (fr)
IT (1) IT1316825B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3882548A1 (fr) 2020-03-20 2021-09-22 Primetals Technologies Germany GmbH Tube de brûleur, module de tube de brûleur et unité de brûleur

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE570045C (de) * 1928-05-02 1933-02-10 Pierre Jules Justinien Andrieu Verfahren und Brenner zur Verbrennung gasfoermiger, fluessiger oder staubfoermiger Brennstoffe, insbesondere zur Beheizung von Zementdrehrohroefen
US3944142A (en) * 1974-03-22 1976-03-16 Foster Wheeler Energy Corporation Split stream burner assembly
GB2162303A (en) * 1984-07-06 1986-01-29 Leipzig Energiekombinat Burner for coal and/or oil
DE3614176A1 (de) * 1985-10-24 1987-04-30 Inst Energieversorgung Turbulenzbrenner und verfahren zur verbrennung von kohlenstaub und/oder heizoel
EP0421903A2 (fr) * 1989-10-04 1991-04-10 ENTREPRISE GENERALE DE CHAUFFAGE INDUSTRIEL PILLARD. Société anonyme dite: Procédé d'exploitation d'un brûleur et brûleurs pour four tubulaire tournant
EP0711952A2 (fr) * 1994-11-14 1996-05-15 Mitsubishi Jukogyo Kabushiki Kaisha Brûleur à charbon pulvérisé
EP0836048A1 (fr) * 1996-10-08 1998-04-15 Ansaldo Energia S.P.A. Brûleur
EP0926435A1 (fr) * 1997-12-24 1999-06-30 Entreprise Generale De Chauffage Industriel Pillard Amélioration aux brûleurs à combustible solide

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE570045C (de) * 1928-05-02 1933-02-10 Pierre Jules Justinien Andrieu Verfahren und Brenner zur Verbrennung gasfoermiger, fluessiger oder staubfoermiger Brennstoffe, insbesondere zur Beheizung von Zementdrehrohroefen
US3944142A (en) * 1974-03-22 1976-03-16 Foster Wheeler Energy Corporation Split stream burner assembly
GB2162303A (en) * 1984-07-06 1986-01-29 Leipzig Energiekombinat Burner for coal and/or oil
DE3614176A1 (de) * 1985-10-24 1987-04-30 Inst Energieversorgung Turbulenzbrenner und verfahren zur verbrennung von kohlenstaub und/oder heizoel
EP0421903A2 (fr) * 1989-10-04 1991-04-10 ENTREPRISE GENERALE DE CHAUFFAGE INDUSTRIEL PILLARD. Société anonyme dite: Procédé d'exploitation d'un brûleur et brûleurs pour four tubulaire tournant
EP0711952A2 (fr) * 1994-11-14 1996-05-15 Mitsubishi Jukogyo Kabushiki Kaisha Brûleur à charbon pulvérisé
EP0836048A1 (fr) * 1996-10-08 1998-04-15 Ansaldo Energia S.P.A. Brûleur
EP0926435A1 (fr) * 1997-12-24 1999-06-30 Entreprise Generale De Chauffage Industriel Pillard Amélioration aux brûleurs à combustible solide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3882548A1 (fr) 2020-03-20 2021-09-22 Primetals Technologies Germany GmbH Tube de brûleur, module de tube de brûleur et unité de brûleur
EP3882547A1 (fr) * 2020-03-20 2021-09-22 Primetals Technologies Germany GmbH Tube de brûleur, module de tube de brûleur et unité de brûleur

Also Published As

Publication number Publication date
DE60119417D1 (de) 2006-06-14
ITMI20000598A0 (it) 2000-03-22
EP1136776B1 (fr) 2006-05-10
ITMI20000598A1 (it) 2001-09-22
CY1105525T1 (el) 2010-07-28
EP1136776A3 (fr) 2002-08-14
ES2263545T3 (es) 2006-12-16
IT1316825B1 (it) 2003-05-12
ATE325997T1 (de) 2006-06-15

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