CN1307673A

CN1307673A - Burner

Info

Publication number: CN1307673A
Application number: CN99808003A
Authority: CN
Inventors: 艾伯·奥尔森
Original assignee: FLSmidth and Co AS
Current assignee: FLSmidth and Co AS
Priority date: 1998-12-10
Filing date: 1999-12-07
Publication date: 2001-08-08
Anticipated expiration: 2019-12-07
Also published as: KR20010053453A; CN1140719C; KR100583037B1; DK173612B1; DE69902297D1; WO2000034713A1; AU753552B2; ES2177338T3; BR9911570A; EP1137898A1; ATE221174T1; DK199801632A; AU1971600A; DE69902297T2; EP1137898B1

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 kind of burner; it is used for solid, liquid and/or gas combustion are joined in the combustion zone of kiln such as rotary kiln; thereby produce clinker or similar products; this burner comprises one or a lot of guiding fuel and pipe initial air, substantially concentric; outermost pipe disposes fireproof casing, thereby the protection burner avoids being subjected to the gas of heating kiln.

Known the sort of burner mentioned above a kind of in PCT/EP98/00145, and PCT/EP98/00145 had by the application's applicant, and its content is believed to comprise in this application.

When for example using this burner to make cement in rotary kiln, usually run into dust-laden kiln gas body there, the upside place that has been presented near the outside tube of the burner at its tip tends to form very continually deposit.Within about a few hours, these deposits can form cone-shaped mountain-be elevated to several meters height-this cone-shaped mountain to be made of the grog dust of local melting basically.These deposits cause the certain operations problem, because they can partial occlusion air spray orifice, therefore change the shape and the direction of flame, and this must cause that under hostile environment flame can collide the inner liner in the kiln, may cause the lining remarkable minimizing in service life.Under aforesaid sedimental on a large scale situation, the burner pipe can bear excessive mechanical load, and this load can cause burner to damage.

The known fact is can address the above problem by removing these deposits termly.When reaching this time point, standing procedure is long by artificial use, the tubulose spray gun is removed these deposits, and this spray gun disposes with the nozzle near the high-pressure injection water of 300bar.Usually the spray gun that inserts by the peep hole on the kiln hood must produce with deposit and closely contact.When these deposits of water impact, high temperature causes vapour explosion.This just vapour explosion causes these deposit efflorescence.

Said method has many shortcomings.With regard to regard to operating personnel's injury, strong vapour explosion causes the accident.For this reason, must require the operator to dress necessary protective device.Because these deposits are formed at the place, tip of burner pipe, and the length of this burner pipe generally can be 8-10 rice, therefore handling this long spray gun is not to be easy to task by this less peep hole.In many cases, need two people to operate this spray gun.Because current may can impact lining rather than deposit because of carelessness, therefore there are the various danger of the fireproof casing of infringement burner pipe.In order to ensure the validity of this method, therefore must be with 2 or 3 hours interval and remove deposit often, continually, this makes this method waste the plenty of time.

The another kind of method of having attempted is included in water pistol forever is set in the burner pipe.This has eliminated harm and has saved time-consuming manually-operated.But if water impact is applied in the zone of expansion, this method shows it is inappropriate, because it shows that having only realization to remove these deposits effectively is only effectively.

At last, at DE19628487A1 the third method has been described.Burner described in described public publication comprises auxiliary outside tube, and this outside tube is arranged on its place, tip and axially and vertically has many nozzle openings.This pipe is connected on the pneumatically-operated aerojet device, and by clocklike at interval driving the aerojet device, thereby attempt to remove these deposits.But it is impossible that this method is removed all deposits, just may remove the deposit that is positioned at tightly near nozzle opening.

The purpose of this invention is to provide a kind of burner, can remove deposit and not have above-mentioned any shortcoming by means of this burner.

According to the present invention, realize above-mentioned purpose by the sort of burner of in introduction, being mentioned, it is characterized in that: it comprises tumbler, by this tumbler, the most external pipe can be rotated around the longitudinal axis of burner at least.

Therefore can realize: can avoid the sediment pile at burner upside place during operation, because when pipe rotates, any this dust deposit thing will be removed.The obvious advantage of another of this method is, because the rotation of pipe makes the wearing and tearing that cause from product flows and the width of cloth penetrate heat and be uniformly distributed on the whole circumference direction of burner, and the product influence of flowing to the downside lining of burner has under normal circumstances also reduced.This has prolonged the service life of this burner, has therefore improved the stream factor of kiln.

This whirligig can be made of any suitable device that can imagine, but it preferably should belong to frame for movement, for example in the mode of gear.This tumbler can manually-operated or is used the motor of Long-distance Control to operate.

Installing under the situation of motor to tumbler, motor should be arranged to suitably to rotary speed of pipe, and this rotary speed per hour is in 0.25 to 5 scope of changeing, and preferably per hour 1 encloses.

In its most basic structure, burner includes only a pipe, and this pipe is used for guiding fuel and initial air.But, preferably burner comprises the burner pipe, this burner pipe comprises the inside tube that one or more and this burner pipe is set together with one heart, and described these pipes form many ring ducts, thereby guides respectively and burner oil and initial air.In this embodiment of burner of the present invention, to be rotated around the longitudinal axis of burner be possible to the most external pipe at least, but burner can also be shaped and allows whole burner to be rotated around its longitudinal axis.

In a preferred embodiment, burner comprises jacket layer pipe (jacket pipe), and this jacket layer pipe is around this burner pipe arranged concentric, and in this embodiment, the jacket layer pipe can be rotated around the longitudinal axis of burner at least.

Comprising at burner under the situation of jacket layer pipe, is possible thereby the guiding of a part of initial air stream is cooled off the jacket layer pipe by a gap that is arranged between burner pipe and the jacket layer pipe.The air of guiding by burner pipe and jacket layer pipe flow needed combustion air flow on the best constitution theory 2% and 4% between.

In addition, the jacket layer pipe can dispose porose, thereby the air that makes into stream changes direction, and the air stream of coming in helps limiting the degree that is deposited on the dust on the burner.

This burner also comprises: one or many burner guns are used for guiding and atomizing of liquids or gaseous fuel; And one or many pipes, be used for guiding and the auxiliary solid fuel of injection.

Referring now to accompanying drawing the present invention is described in further detail, wherein:

Fig. 1 is the partial cut away side views of burner of the present invention, and

Fig. 2 is the front cross-sectional view of said burner.

Fig. 1 and 2 shows a kind of burner 1, and this burner is used at kiln such as rotary kiln mixed combustion oil and fine coal, thereby makes clinker or similar products.Burner 1 belongs to known configurations basically and comprises center protection pipe 2, and independently the spray gun (not shown) is installed in this protection pipe, thus guiding fuel oil and atomized fuel oil.

Two pipes 3 and 4 arrange that around protection pipe 2 pipe 3 and 4 forms ring duct 6 between them with one heart, thus guiding and injection fine coal and AIR MIXTURES.In order to cool off unshowned oil atomizer gun and to make it not be subjected to effect of dust, guide therefore for total initial air stream in a small amount and make it to spray by manage 3 and protection pipe 2 between the gap.Except protection pipe 2, to supply with auxiliary other fuel be possible thereby insert one or many pipes in pipe 3.

Burner pipe 7 arranges around pipe 4 that with one heart this burner pipe 7 combines with pipe 4 and forms ring duct 9, thus the remainder of guiding initial air stream.Shown in the burner outermost comprise jacket layer pipe 11, this jacket layer pipe 11 externally disposes fireproof casing 12 and supporting by packing ring 13 foremost at it.Have guide ring 15 in the inside of jacket layer pipe, this guide ring 15 leans against on the packing ring suitably.The rear end of pipe 11 is supported by roller 19.Pipe 11 rotates by means of gear 21.Be inserted through at the jacket layer pipe on the position of kiln wall 32 and have spring load closing plate 25.This closing plate has prevented to suck sewing of air in the stove in the slit everywhere from kiln, allows jacket layer pipe 11 to be rotated simultaneously.Also have, the spring load of closing plate 25 will guarantee that above-mentioned guide ring 15 leans against on the packing ring, so that the jacket layer pipe is fixing in the axial direction, and irrelevant with vertical thermal expansion.

Burner pipe 7 has many borings 31, thereby fraction initial air stream is by cooling off in these boring 31 gaps 33 that can export between burner pipe and the jacket layer pipe.The cooling air stream that under normal circumstances constitutes the theoretical combustion air stream of 2-4% should guide by this gap basically backward, thereby makes it to minimize to the feasible scope of the influx in the cold air that enters in the kiln.On the other hand, jacket layer pipe 11 can form with many holes 35, thereby comes transfer air by fireproof casing.

By means of use gear 21 rotation pipes by artificial or company's motor (built-on motor) (not shown), can avoid on the jacket layer pipe, forming deposit.The rotary speed that is applied should be such: this pipe per hour rotates a complete turn at least.Can produce rotation with constant rotary speed or with discontinuous speed.

Claims

1. a burner (1); it is used for a solid; thereby liquid and/or gaseous fuel join and make clinker or similar products in the combustion zone of kiln such as rotary kiln; this burner (1) comprises one or more pilot fuel and initial air; substantially concentric pipe (2; 3; 4; 7); outermost pipe disposes fireproof casing (12); thereby the protection burner is avoided heating kiln gas; it is characterized in that: it comprises tumbler (21); by this tumbler (21), the most external pipe can be rotated around the longitudinal axis of burner at least.

2. burner as claimed in claim 1 is characterized in that: described whirligig be mechanical device as mode with gear (21), and can manually-operated or use the motor of Long-distance Control to operate.

3. burner as claimed in claim 2 is characterized in that: described motor is arranged to rotary speed of pipe, and this rotary speed per hour is in 0.25 to 5 scope of changeing, and preferably per hour about 1 circle.

4. burner as claimed in claim 3, it is characterized in that: it comprises burner pipe (7), this burner pipe (7) comprises the inside tube (2,3,4) that one or more is set together with this burner pipe with one heart, described these pipes form many ring ducts, thereby guide respectively and burner oil and initial air.

5. burner as claimed in claim 4 is characterized in that: it is configured to whole burner and is rotated around its longitudinal axis.

6. as the arbitrary described burner of claim 1-5, it is characterized in that: it comprises jacket layer pipe (11), and this jacket layer pipe is around described burner pipe (7) arranged concentric, and this jacket layer pipe can be rotated around the longitudinal axis of burner at least.

7. burner as claimed in claim 6 is characterized in that: it comprises the gap (33) that is positioned between burner pipe (7) and the jacket layer pipe (11), by this gap come to a part of initial air conductance to, thereby cool off this jacket layer pipe.

8. burner as claimed in claim 7 is characterized in that: guide above-mentioned circulation of air cross needed combustion air flow on gap (33) this air stream constitution theory between burner pipe and the jacket layer pipe 2 and 4% between.

9. burner as claimed in claim 8 is characterized in that: above-mentioned jacket layer pipe (11) forms porose (35), thereby the air that makes into stream changes direction.

10. burner as claimed in claim 9 is characterized in that it comprises: one or more burner gun is used for guiding and atomizing of liquids or gaseous fuel; And one or many pipes, be used for guiding and the auxiliary solid fuel of injection.