EP1137898A1 - Burner - Google Patents

Burner

Info

Publication number
EP1137898A1
EP1137898A1 EP99963405A EP99963405A EP1137898A1 EP 1137898 A1 EP1137898 A1 EP 1137898A1 EP 99963405 A EP99963405 A EP 99963405A EP 99963405 A EP99963405 A EP 99963405A EP 1137898 A1 EP1137898 A1 EP 1137898A1
Authority
EP
European Patent Office
Prior art keywords
burner
pipe
burner according
kiln
conducting
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
EP99963405A
Other languages
German (de)
French (fr)
Other versions
EP1137898B1 (en
Inventor
Ib Ohlsen
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8106718&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1137898(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by FLSmidth and Co AS filed Critical FLSmidth and Co AS
Publication of EP1137898A1 publication Critical patent/EP1137898A1/en
Application granted granted Critical
Publication of EP1137898B1 publication Critical patent/EP1137898B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • 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
    • 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

  • the present invention relates to a burner for introducing solid, liquid and/or gaseous fuel into a burning zone of a kiln, such as a rotary kiln for manufacturing cement clinker or similar products, which burner comprises one or several substantially concentric pipes for conducting fuel and primary air, where the outermost pipe may be equipped with a refractory lining to protect the burner against the hot kiln atmosphere .
  • the above-mentioned method involves a number of disadvantages.
  • the intensive steam explosions pose hazards in terms of injury to operating personnel. For this reason, it is an essential requirement that the operator is wearing the necessary protective outfit.
  • the deposits are formed at the pointed end of the burner pipe, the length of which may typically be from eight to ten metres, it may not be an easy task to manoeuvre the long lance through the small observation hole. In many cases, two persons are needed to operate the lance.
  • the deposits must be removed frequently, quite often at intervals down to two or three hours, and this makes the method very time-consuming.
  • the burner described in said publication comprises an additional, outer pipe which is equipped at its pointed end with a number of nozzle openings in the axial and radial direction.
  • the pipe is connected to a pneumatically operated air blaster, and the deposits can purportedly be removed by activating the air blaster at regular intervals.
  • this method will be able to remove all deposits, probably removing only deposits located in immediate proximity of the nozzle openings.
  • this is achieved by means of a burner of the kind mentioned in the introduction, and being characterized in that it comprises a turning means by means of which at least the outermost pipe can be rotated about the longitudinal axis of the burner.
  • the turning means may consist of any conceivable suitable type but preferably it should be of a mechanical design, for example in the form of a toothed gearing.
  • the turning means may be operated manually or using a motor which may be remote-controlled. In cases where the turning device is motorized, the motor should appropriately be set to give the pipe with a rotational speed within the range of 0.25 to 5 revolutions per hour, preferably at around 1 revolution per hour.
  • the burner comprises only one pipe for conducting fuel and primary air.
  • the burner comprises a burner pipe which incorporates one or several inner pipes located concentrically with the burner pipe, said pipes forming a number of annular ducts for separate conducting and injection of fuel and primary air.
  • the outermost pipe it will be possible at least for the outermost pipe to rotate about the longitudinal axis of the burner, but the burner may also be configured to allow the entire burner to rotate about its longitudinal axis .
  • the burner may comprise a jacket pipe which is arranged concentrically around the burner pipe, and in this embodiment at least the jacket pipe can be made to rotate about the longitudinal axis of the burner.
  • the burner comprises a jacket pipe
  • the airflow which is directed through the burner pipe and the jacket pipe may advantageously constitute between 2 and 4 per cent of the theoretically required combustion airflow.
  • the jacket pipe may be equipped with holes for diverting the incoming airflow which may contribute towards restricting the level of dust being deposited on the burner.
  • the burner may further comprise one or several burner lances for conducting and injecting liquid or gaseous fuel and one or several pipes for conducting and injecting supplementary solid fuels.
  • Fig.l shows a partial sectional side view of a burner according to the invention.
  • Fig. 2 shows a sectional view of the front section of the same burner.
  • a burner 1 which is intended for combined firing on oil and pulverized coal in a kiln, such as a rotary kiln for manufacturing cement clinker or similar products.
  • the burner 1 is essentially of a known design and comprises a central protective pipe 2 in which a separate lance, not shown, may be fitted for conducting and atomizing the fuel oil.
  • a burner pipe 7 Arranged concentrically around the pipe 4 is a burner pipe 7 which in conjunction with the pipe 4 forms an annular duct 9 for conducting the remaining part of the primary airflow.
  • Outermost the shown burner comprises a jacket pipe 11 which is externally equipped with a refractory lining 12 and being supported at its foremost end by spacers 13.
  • Inside the jacket pipe there is a guide ring 15 which lies true against the spacers.
  • the rear end of the pipe 11 is supported by rollers 19.
  • the pipe 11 can be rotated by means of a tooth gearing 21.
  • a spring- loaded closing plate 25 At the location where the jacket pipe is inserted through the kiln wall 23 there is a spring- loaded closing plate 25.
  • the closing plate will prevent in-leakage of false air while allowing, at the same time, the jacket pipe 11 to rotate.
  • the spring loading of the closing plate 25 will ensure that the aforementioned guide ring 15 lies true against the spacers so that the jacket pipe is fixed in the axial direction
  • the burner pipe 7 has a number of drilled holes 31 through which a small portion of the primary airflow can be directed out into the gap 33 between the burner pipe and the jacket pipe for cooling.
  • This cooling airflow which will normally constitute 2-4 per cent of the theoretical combustion airflow should essentially be directed backwards through the gap in order to minimize to practicable extent the inflow of cold air into the kiln.
  • the jacket pipe 11 may be formed with a number of holes 35 for diverting the air through the refractory lining.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Gas Burners (AREA)
  • Incineration Of Waste (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Glass Compositions (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

A description is provided of a burner (1) for introducing solid, liquid and/or gaseous fuel into a burning zone of a kiln, such as a rotary kiln for manufacturing cement clinker or similar products, which burner (1) comprises one or several substantially concentric pipes (2, 3, 4, 7) for conducting fuel and primary air, where the outermost pipe may comprise a refractory lining (12) to protect the burner against the hot kiln atmosphere. The burner is distinguished in that it comprises a turning means (21) by means of which at least the outermost pipe can be rotated about the longitudinal axis of the burner. It is hereby obtained that build-up of deposits on the upper side of the burner during operation can be avoided, and that the abrasion and radiant heat arising from the product flow will be evenly distributed across the entire circumference of the burner.

Description

BURNER
The present invention relates to a burner for introducing solid, liquid and/or gaseous fuel into a burning zone of a kiln, such as a rotary kiln for manufacturing cement clinker or similar products, which burner comprises one or several substantially concentric pipes for conducting fuel and primary air, where the outermost pipe may be equipped with a refractory lining to protect the burner against the hot kiln atmosphere .
From PCT/EP98/00145 which is held by the applicant of the present application, and the content of which being regarded as comprised by the present application, a burner of the kind mentioned above is known.
When using burners of this type in, for example, a rotary kiln for manufacturing cement where a dust-laden kiln atmosphere is often encountered, it has shown that deposits tend to be formed quite frequently on the upper side of the outer pipe of the burner near its pointed end. Within a matter of hours, such deposits may develop into pyramidal mountains - rising to a height of several metres - which essentially consist of partially molten clinker dust. Such deposits may cause operational problems since they may partially block the air nozzle, thereby altering the shape and direction of the flame, which entails that under adverse circumstances the flame may impinge on the internal lining in the kiln, potentially leading to a substantial reduction of the service life of the lining. In case of extensive deposits, as noted above, the burner pipe may be subjected to excessive stress loads, which may cause the burner to break down.
It is a well-known fact that the mentioned problem can be solved on the basis of regular removal of deposits. Up to this point in time, it has been standard practice to remove the deposits manually using a long, tubular lance, equipped with a nozzle for injecting water at high pressure, approximately 300 bar. The lance, which is normally inserted through one of the observation holes in the kiln hood, must be brought into close contact with the deposits. When the water jet impacts the deposits, the high temperature will cause a steam explosion to take place. It is this steam explosion which causes the deposits to disintegrate.
The above-mentioned method involves a number of disadvantages. The intensive steam explosions pose hazards in terms of injury to operating personnel. For this reason, it is an essential requirement that the operator is wearing the necessary protective outfit. Since the deposits are formed at the pointed end of the burner pipe, the length of which may typically be from eight to ten metres, it may not be an easy task to manoeuvre the long lance through the small observation hole. In many cases, two persons are needed to operate the lance. There is a distinct risk of damage to the refractory lining of the burner pipe due to the fact that the water jet may inadvertently impact the lining instead of the deposits. To ensure effectiveness of this method, the deposits must be removed frequently, quite often at intervals down to two or three hours, and this makes the method very time-consuming.
Another method which has been attempted involves permanent installation of the water lance inside the burner pipe. This will dispense with the hazardous and time-consuming manual operation. However, this method has turned out to be unsuitable as it appears that effective removal of the deposits can only be achieved if water jet impacting is applied over an extended area.
Finally, a third method has been described in DE-19628487-
Al . The burner described in said publication comprises an additional, outer pipe which is equipped at its pointed end with a number of nozzle openings in the axial and radial direction. The pipe is connected to a pneumatically operated air blaster, and the deposits can purportedly be removed by activating the air blaster at regular intervals. However, it is unlikely that this method will be able to remove all deposits, probably removing only deposits located in immediate proximity of the nozzle openings.
It is the objective of the present invention to provide a burner by means of which deposits can be removed without any of the aforementioned disadvantages.
According to the invention this is achieved by means of a burner of the kind mentioned in the introduction, and being characterized in that it comprises a turning means by means of which at least the outermost pipe can be rotated about the longitudinal axis of the burner.
It is hereby obtained that build-up of deposits on the upper side of the burner during operation can be avoided since any such dust deposits will be dislodged when the pipe is rotated. Another significant advantage of the method is that the abrasion and radiant heat arising from the product flow which will normally have a degrading effect on the lining on the lower side of the burner will be evenly distributed across the entire circumference of the burner because of the rotation of the pipe. This will prolong the service life of the burner, thus enhancing the run factor of the kiln.
The turning means may consist of any conceivable suitable type but preferably it should be of a mechanical design, for example in the form of a toothed gearing. The turning means may be operated manually or using a motor which may be remote-controlled. In cases where the turning device is motorized, the motor should appropriately be set to give the pipe with a rotational speed within the range of 0.25 to 5 revolutions per hour, preferably at around 1 revolution per hour.
In its most basic design, the burner comprises only one pipe for conducting fuel and primary air. However, it is preferred that the burner comprises a burner pipe which incorporates one or several inner pipes located concentrically with the burner pipe, said pipes forming a number of annular ducts for separate conducting and injection of fuel and primary air. In such an embodiment of the burner according to the invention, it will be possible at least for the outermost pipe to rotate about the longitudinal axis of the burner, but the burner may also be configured to allow the entire burner to rotate about its longitudinal axis .
In a preferred embodiment the burner may comprise a jacket pipe which is arranged concentrically around the burner pipe, and in this embodiment at least the jacket pipe can be made to rotate about the longitudinal axis of the burner.
In cases where the burner comprises a jacket pipe it will be possible to direct a portion of the primary airflow through a gap provided between the burner pipe and the jacket pipe in order to cool off the jacket pipe. The airflow which is directed through the burner pipe and the jacket pipe may advantageously constitute between 2 and 4 per cent of the theoretically required combustion airflow.
Furthermore, the jacket pipe may be equipped with holes for diverting the incoming airflow which may contribute towards restricting the level of dust being deposited on the burner. The burner may further comprise one or several burner lances for conducting and injecting liquid or gaseous fuel and one or several pipes for conducting and injecting supplementary solid fuels.
The invention will now be described in further details with reference to the drawing, being diagrammatical, and where
Fig.l shows a partial sectional side view of a burner according to the invention, and
Fig. 2 shows a sectional view of the front section of the same burner.
In Fig. 1 and 2 is shown a burner 1 which is intended for combined firing on oil and pulverized coal in a kiln, such as a rotary kiln for manufacturing cement clinker or similar products. The burner 1 is essentially of a known design and comprises a central protective pipe 2 in which a separate lance, not shown, may be fitted for conducting and atomizing the fuel oil.
Arranged concentrically around the protective pipe 2 are two pipes 3 and 4 which form between them an annular duct 6 for conducting and injecting a mixture of pulverized coal and air. In order to cool the not shown oil lance and to keep it free from dust a small amount of the total primary airflow may be conducted and injected through the gap between pipe 3 and the protective pipe 2. In addition to the protective pipe 2, it will be possible to insert in the pipe 3 one or several pipes for feeding supplementary alternative fuels.
Arranged concentrically around the pipe 4 is a burner pipe 7 which in conjunction with the pipe 4 forms an annular duct 9 for conducting the remaining part of the primary airflow. Outermost the shown burner comprises a jacket pipe 11 which is externally equipped with a refractory lining 12 and being supported at its foremost end by spacers 13. Inside the jacket pipe there is a guide ring 15 which lies true against the spacers. The rear end of the pipe 11 is supported by rollers 19. The pipe 11 can be rotated by means of a tooth gearing 21. At the location where the jacket pipe is inserted through the kiln wall 23 there is a spring- loaded closing plate 25. The closing plate will prevent in-leakage of false air while allowing, at the same time, the jacket pipe 11 to rotate. Also, the spring loading of the closing plate 25 will ensure that the aforementioned guide ring 15 lies true against the spacers so that the jacket pipe is fixed in the axial direction regardless of thermal longitudinal expansion.
The burner pipe 7 has a number of drilled holes 31 through which a small portion of the primary airflow can be directed out into the gap 33 between the burner pipe and the jacket pipe for cooling. This cooling airflow which will normally constitute 2-4 per cent of the theoretical combustion airflow should essentially be directed backwards through the gap in order to minimize to practicable extent the inflow of cold air into the kiln. Alternatively, the jacket pipe 11 may be formed with a number of holes 35 for diverting the air through the refractory lining.
During operation formation of deposits on the jacket pipe can be avoided by rotating the pipe using the tooth gearing 21, either manually or using a built-on motor, not shown. The applied rotational speed should be such that the pipe completes at least one full revolution per hour. Rotation may take place at a constant rotational speed or at a discontinuous speed.

Claims

Claims
1. A burner (1) for introducing solid, liquid and/or gaseous fuel into a burning zone of a kiln, such as a rotary kiln for manufacturing cement clinker or similar products, which burner (1) comprises one or several substantially concentric pipes (2, 3, 4, 7) for conducting fuel and primary air, where the outermost pipe may be equipped with a refractory lining (12) to protect the burner against the hot kiln atmosphere characterized in that it comprises a turning means (21) by means of which at least the outermost pipe can be rotated about the longitudinal axis of the burner.
2. A burner according to claim 1, characterized in that the turning means is mechanical, for example in the form of a tooth gearing (21) and being operable manually or by means of a motor which may be remote-controlled.
3. A burner according to claim 2, characterized in that the motor is set to give the pipe a rotational speed within the range of 0.25 to 5 revolutions per hour, preferably at around 1 revolution per hour.
4. A burner according to claim 3, characterized in that it comprises a burner pipe (7) which incorporates one or several inner pipes (2, 3, 4) located concentrically with the burner pipe, said pipes forming a number of annular ducts for separate conducting and injection of fuel and primary air.
5. A burner according to claim 4, characterized in that it is configured so that the entire burner is able to rotate about its longitudinal axis.
6. A burner according to any of the claims 1-5, characterized in that it comprises a jacket pipe (11) which is arranged concentrically around the burner pipe (7) and in that at least this jacket pipe can be made to rotate about the longitudinal axis of the burner.
7. A burner according to claim 6, characterized in that it comprises between the burner pipe (7) and the jacket pipe (11) a gap 33 through which a portion of the primary airflow is directed in order to cool off the jacket pipe.
8. A burner according to claim 7, characterized in that the airflow which is directed through the gap (33) between the burner pipe and the jacket pipe constitutes between 2 and 4 per cent of the theoretically required combustion airflow.
9. A burner according to claim 8, characterized in that the jacket pipe (11) is formed with holes (35) for diverting the incoming airflow.
10. A burner according to claim 9, characterized in that it comprises one or several burner lances for conducting and injecting liquid or gaseous fuel and one or several pipes for conducting and injecting supplementary solid fuels.
EP99963405A 1998-12-10 1999-12-07 Burner Revoked EP1137898B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK163298 1998-12-10
DK199801632A DK173612B1 (en) 1998-12-10 1998-12-10 Burner
PCT/EP1999/009569 WO2000034713A1 (en) 1998-12-10 1999-12-07 Burner

Publications (2)

Publication Number Publication Date
EP1137898A1 true EP1137898A1 (en) 2001-10-04
EP1137898B1 EP1137898B1 (en) 2002-07-24

Family

ID=8106718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99963405A Revoked EP1137898B1 (en) 1998-12-10 1999-12-07 Burner

Country Status (10)

Country Link
EP (1) EP1137898B1 (en)
KR (1) KR100583037B1 (en)
CN (1) CN1140719C (en)
AT (1) ATE221174T1 (en)
AU (1) AU753552B2 (en)
BR (1) BR9911570A (en)
DE (1) DE69902297T2 (en)
DK (1) DK173612B1 (en)
ES (1) ES2177338T3 (en)
WO (1) WO2000034713A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO180206C (en) * 1992-11-30 1997-03-05 Elkem Aluminium Structural parts for aluminum electrolysis cells
CN108571898A (en) * 2017-03-14 2018-09-25 南京凯盛国际工程有限公司 Rotary kiln burner protective device
CN109323256A (en) * 2018-09-30 2019-02-12 四川德胜集团钒钛有限公司 A kind of high vanadium titanium furnace charge rotary kiln burner

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK169446B1 (en) * 1991-04-19 1994-10-31 Smidth & Co As F L Rotary furnace burner and method of forming a burner flame with the burner
US6128648A (en) * 1994-11-23 2000-10-03 International Business Machines Corporation Information handling system and method for maintaining coherency between network servers and mobile terminals
DK173204B1 (en) * 1997-03-07 2000-03-13 F.L.Smidth & Co A/S is in an oven Proceed and burn to introduce burning

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0034713A1 *

Also Published As

Publication number Publication date
KR20010053453A (en) 2001-06-25
ATE221174T1 (en) 2002-08-15
CN1140719C (en) 2004-03-03
BR9911570A (en) 2001-03-20
ES2177338T3 (en) 2002-12-01
CN1307673A (en) 2001-08-08
AU1971600A (en) 2000-06-26
DK199801632A (en) 2000-06-11
DK173612B1 (en) 2001-04-30
DE69902297T2 (en) 2003-03-20
WO2000034713A1 (en) 2000-06-15
EP1137898B1 (en) 2002-07-24
AU753552B2 (en) 2002-10-24
KR100583037B1 (en) 2006-05-24
DE69902297D1 (en) 2002-08-29

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