EP3726133A1 - Dispositif de combustion du charbon pulvérisé - Google Patents

Dispositif de combustion du charbon pulvérisé Download PDF

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Publication number
EP3726133A1
EP3726133A1 EP20164103.2A EP20164103A EP3726133A1 EP 3726133 A1 EP3726133 A1 EP 3726133A1 EP 20164103 A EP20164103 A EP 20164103A EP 3726133 A1 EP3726133 A1 EP 3726133A1
Authority
EP
European Patent Office
Prior art keywords
coal dust
downpipe
combustion device
rotary valve
conveying
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.)
Withdrawn
Application number
EP20164103.2A
Other languages
German (de)
English (en)
Inventor
Kemal Omerbegovic
Torsten Martini
Kurt Dietmar Zimmer
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.)
Benninghoven GmbH and Co KG
Original Assignee
Benninghoven GmbH and Co KG
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 Benninghoven GmbH and Co KG filed Critical Benninghoven GmbH and Co KG
Publication of EP3726133A1 publication Critical patent/EP3726133A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F23K2203/00—Feeding arrangements
    • F23K2203/006—Fuel distribution and transport systems for pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/008—Feeding devices for pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/10—Supply line fittings
    • F23K2203/104—Metering devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/20—Feeding/conveying devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/20—Feeding/conveying devices
    • F23K2203/201—Feeding/conveying devices using pneumatic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/03001—Airlock sections in solid fuel supply lines

Definitions

  • the invention relates to a pulverized coal combustion device.
  • the performance of a burner in which coal dust is burned depends, among other things, on the amount of coal dust fed into the burner and burned there.
  • a metering device is used to meter the amount of coal dust into the burner.
  • Dosing devices are known from JP H08-14531 A and JP S54-137869 A .
  • the invention is based on the object of improving the controllability of the burner and in particular expanding the control range of the burner, in particular in a lower load range of the control range.
  • a pulverized coal combustion device according to the features of claim 1.
  • the essence of the invention is that a connecting line with a downpipe is connected to a metering unit, which is designed in particular as a rotary valve, the downpipe being inclined relative to the vertical having arranged sliding surface.
  • the downpipe enables targeted braking of the coal dust released from the metering unit, so that the coal dust is released evenly and in a controlled manner from the rotary valve and conveyed to a burner unit via the connecting line.
  • the burner behavior of the burner unit is thereby improved.
  • the dosing unit is used to dose the amount of coal dust to be dispensed, which is burned in the burner unit.
  • the downpipe of the connecting line is connected to an outlet opening of the rotary valve.
  • a uniform discharge of the coal dust is given, in particular, when the area of the outlet opening increases essentially, in particular precisely, continuously along the direction of rotation of the rotary valve of the rotary valve. It is also possible that the area of the outlet opening does not increase continuously along the direction of rotation of the cellular wheel.
  • the increase in the cross-sectional area of the outlet opening along the direction of rotation can be inconstant and in particular have at least one local maximum.
  • the outlet opening has, in particular, a contour that is concave at least in sections.
  • the outlet opening is designed to be concave in a transition area between an initial section and an end section.
  • the axis of rotation of the cellular wheel is oriented in particular perpendicular to the outlet opening.
  • a downpipe according to claim 2 ensures an uncomplicated arrangement of the same.
  • the connection of the rotary valve with an underlying, in particular horizontally oriented conveying line is improved.
  • the downpipe is designed as an inclined cylinder tube.
  • the pipe longitudinal axis of the downpipe can also be non-linear in sections, in particular kinked or curved.
  • the downpipe can have several linear sections with different inclinations.
  • a conveying cross-sectional area according to claim 3 enables the coal dust discharged from the rotary valve to be brought together to the conveying line.
  • the cross-sectional conveying surface has in particular a slot-shaped, round or oval contour.
  • the outer contour of the cross-sectional conveying surface is convex.
  • the slide surface is designed like a channel.
  • a configuration of the conveying cross-sectional area according to claim 4 enables an advantageous manufacture of the downpipe. The manufacturing effort is reduced.
  • a conveying cross-sectional area according to claim 5 enables an advantageous conveyance of the coal dust. In particular, accumulations of material within the delivery pipe are avoided.
  • An embodiment of the downpipe according to claim 6 favors an automatic, gravity-induced conveyance of the coal dust through the downpipe.
  • An angle of inclination of the slide surface according to claim 7 ensures trouble-free, gravity-related conveyance of the coal dust.
  • the slope of the slide surface is linear.
  • a sliding surface according to claim 8 promotes the flowing movement of the coal dust along the downpipe.
  • the slide surface is designed like a channel.
  • the sliding surface can have a semicircular or oval contour, for example. Other, in particular kink-free, contours for the sliding surface are also possible.
  • a delivery line according to claim 9 enables a direct connection of the rotary valve with the burner unit.
  • the downpipe is connected directly to the delivery line.
  • a deflection of the coal dust flow along the connection line in particular a 90 ° deflection.
  • the delivery line and the downpipe form a T-piece.
  • Coal dust combustion device marked as a whole with 1 comprises a metering unit in the form of a rotary valve 2 for metering a quantity of coal dust.
  • the pulverized coal combustion device 1 comprises a burner unit (not shown in the figures) for burning the metered quantity of pulverized coal.
  • the pulverized coal combustion device 1 comprises a connecting line 3 which connects the metering unit 2 to the burner unit.
  • An intermediate container 4 is arranged above the dosing unit 2.
  • the intermediate container 4 is connected to a coal dust silo, not shown. Coal dust is temporarily stored in the coal dust silo and conveyed into the intermediate container 4.
  • the coal dust silo is arranged above the intermediate container 4.
  • the intermediate container 4 is arranged concentrically to the rotary valve 2.
  • the intermediate container 4 is designed to taper along the force of gravity, in particular conically, in order to enable the coal dust to be conveyed automatically into the rotary valve 2.
  • the intermediate container 4 is connected to the rotary valve 2 via a flange connection 5.
  • the intermediate container 4 is placed on an upper housing cover 31 of the rotary valve 2 and connected to it by means of the flange connection 5.
  • a separating base 6 is arranged on the intermediate container 4, which separates the outlet opening 7 at least in some areas.
  • the intermediate container is through the partition base 6 4 separated from the rotary valve 2.
  • the dividing base 6 is formed by the upper housing cover 31 of the rotary valve 2.
  • the partition base 6 is semicircular and essentially covers half of the outlet opening 7. Via the other half, which is not covered by the partition base 6, coal dust can pass directly from the intermediate container 4 via the outlet opening 7 into the rotary valve 2.
  • the agitator 8 loosens and conveys the coal dust evenly into the rotary valve 2 below.
  • the rotary valve 2 is a vertical rotary valve.
  • the cellular wheel sluice 2 has a cellular wheel 9 with twenty cell walls 10.
  • the cell walls 10 are also referred to as rotor blades.
  • a cellular wheel chamber 11 is formed between two rotor blades 10.
  • the cellular wheel 9 has twenty cellular wheel chambers 11.
  • the cellular wheel chambers 11 are designed identically and in particular have an identical size.
  • the bucket wheel 9 is arranged in a housing 12 of the bucket wheel sluice 2.
  • the housing 12 is designed essentially as a tubular cylinder, the cylinder axis being oriented vertically.
  • the cellular wheel 9 is mounted in the housing 12 so that it can rotate about an axis of rotation 17.
  • the axis of rotation 17 is in particular identical to the cylinder axis of the housing 12.
  • the axis of rotation 17 is particularly oriented vertically.
  • the axis of rotation 17 is in particular identical to the agitator axis of the agitator 8.
  • the housing 12 has an inlet opening 13 in order to feed coal dust from the intermediate container 4 into the rotary valve 2.
  • the inlet opening 13 corresponds to the outlet opening 7.
  • the inlet opening 13 is identical to the outlet opening 7.
  • a lower housing cover 15 is attached to the housing 12 at a lower flange connection 14 on the housing 12.
  • the lower housing cover 15 is separate in Fig. 8 shown.
  • the lower housing cover 15 has an outlet opening 16 through which the coal dust is discharged evenly from the rotary valve 2.
  • the cellular wheel 9 is driven by a frequency-controlled gear motor 18 via a chain, not shown, which runs in a chain housing 19.
  • the base load for the geared motor is approximately 1 min -1 .
  • the gear motor 18 is driven at 20 min -1 .
  • the agitator 8 is rigidly connected to the cellular wheel 9. A rotation of the star feeder 9 causes the agitator 8 to rotate instantaneously.
  • the geared motor 18 is held by means of a motor mount 20.
  • the outlet opening 16 is arranged on the front side on the cellular wheel 9 and in particular on the cellular wheel chambers 11.
  • the outlet opening 16 is in Essentially teardrop-shaped or pipe-shaped.
  • the outlet opening 16 is made in one piece.
  • the outlet opening 16 has a leading start section 22 and a trailing end section 23 along the direction of rotation 21 of the cellular wheel 9.
  • the starting section 22 has a radial extension r A which is smaller than a radial extension r E of the end section 23.
  • the starting section 22 and the end section 23 are connected to one another in one piece. It is basically conceivable to separate the starting section 22 from the end section 23 from one another by a separating web. In this case, the outlet opening 16 would be designed in two parts.
  • the starting section 22 extends along an angle of rotation w A.
  • the end section 23 extends in the direction of rotation by an angle of rotation w E.
  • the angle of rotation w A of the initial section 22 is 15 °.
  • the angle of rotation w E of the end section 23 is 30 °.
  • the radial extension r A of the starting section 22 is designed to increase, in particular to increase continuously, along the direction of rotation 21.
  • the starting section 22 is designed essentially as a U opening in the direction of rotation 21.
  • the end section 23 is designed to be essentially circular.
  • the bucket wheel chambers 11 are delimited in the radial direction by the bucket wheel 9 and the housing 12.
  • the radial extension r A of the initial section 22 is less than 50% of the radial extension r K of the cellular wheel chamber 11.
  • the radial extension According to the exemplary embodiment shown, r E of the end section 23 corresponds to the radial extent r K of the cellular wheel chamber 11.
  • the expansion of the angle of rotation of the cellular wheel chamber 11 is also referred to as the chamber width w K.
  • the chamber width w K is 15 °.
  • the angle of rotation w A of the initial section 22 is as large as the chamber width w K.
  • the angle of rotation w E of the end section 23 is twice the chamber width w K.
  • the connecting line 3 is connected to the outlet opening 16.
  • the connecting line 3 comprises an essentially vertically oriented downpipe 24 and a delivery line 25.
  • the delivery line 25 is connected to the burner, not shown.
  • the delivery line 25 is arranged essentially horizontally.
  • the delivery line 25 is designed as a diffuser 26 in the area in which the downpipe 24 is coupled.
  • the pipe cross-sectional area of the diffuser 26 decreases along the conveying direction 27. Upstream in relation to the conveying direction 27, a conveying fan (not shown) is connected to the diffuser 26 in order to provide a conveying air flow.
  • a first compressed air line 28 is connected to the delivery line 25 and is guided via an outer jacket wall into the intermediate container 4 above the lower housing cover 15 and through it.
  • the first compressed air line 28 opens into the rotary valve 2 above the outlet opening 16.
  • an opening of the first compressed air line 28 is aligned and in particular concentric with the outlet opening 16.
  • first compressed air line 28 compressed air can flow through the cellular wheel chamber 11, which is located in the area of the outlet opening 16, from above in order to improve emptying of the cellular wheel chamber 11 and in particular to ensure complete emptying of the cellular wheel chamber 11.
  • the first compressed air line 28 opens into a first air inlet 29 on the rotary valve 2.
  • the first air inlet 29 is arranged in alignment with the end section 23.
  • the first air inlet opening 29 is oriented perpendicular to the axis of rotation 17.
  • the conveying air supplied through the first air inlet opening 29 is oriented parallel to the axis of rotation 17 and enables the coal dust to be blown out in an improved manner.
  • the coal dust is conveyed vertically, that is, parallel to the axis of rotation 17, out of the rotary valve 2.
  • a second compressed air line 30 is also connected to the rotary valve.
  • the second, additional compressed air line 30 is passed through a side opening in the upper housing cover 31 of the rotary valve 2.
  • a second air inlet opening 32 is provided in the upper housing cover 31.
  • the second supply air opening 32 is oriented perpendicular to the axis of rotation 17, so that the air supplied via the second compressed air line 30 flows from above into the respective cellular wheel chamber 11.
  • the second air inlet opening 32 is arranged in alignment with the outlet opening 16, in particular with the starting section 22.
  • the second air inlet opening 32 is arranged in front of the first air inlet opening 29 along the direction of rotation 21. According to the exemplary embodiment shown, the second air inlet opening 32 is arranged in front of the first air inlet opening 29 at an angle of rotation w with respect to the axis of rotation 17 of 15 °.
  • the angle of rotation offset between the second air inlet opening 32 and the first air inlet opening 29 of the chamber width w K that is to say 15 ° according to the exemplary embodiment shown.
  • the angle of rotation offset between the second air inlet 32 and the first air inlet 29 corresponds to the angle of rotation w A of the starting section 22.
  • the angle of rotation offset is at least 80% of the angle of rotation w A of the starting section 22, in particular at least 90% of the angle of rotation w A of the starting section 22 and at least 95% of the angle of rotation w A of the starting section 22.
  • a suction opening 33 to which a suction line 34 is connected, is arranged on an outer cylindrical surface of the housing 12 of the cellular wheel 2. Leakage air can be sucked out of the rotary valve 2 via the suction opening 33 and the suction line 34, which air is produced during the rotary movement of the rotary valve 9. The leakage air is in particular sucked out of the cellular wheel chamber 11 before the cellular wheel chamber 11 is again filled with coal dust from the intermediate container 4.
  • the suction opening 33 is arranged downstream of the first air supply opening 29 and the second air supply opening 32.
  • a Venturi nozzle 35 is integrated into the suction line 34 in order to promote the suction process of the leakage air from the rotary valve 2.
  • the suction line 34 opens into the delivery line 25.
  • the suction line 34 opens into the delivery line 34 in relation to the delivery direction 27 in the area in which the downpipe 24 opens into the delivery line 25.
  • the first compressed air line 28 is connected upstream of the downpipe 24 and the suction line 34 to the delivery line 25.
  • An injector 36 is integrated in the delivery line 25.
  • the injector 36 is arranged upstream with respect to the conveying direction 27 with respect to the downpipe 24 and the opening of the suction line 34 into the conveying line 25.
  • the injector 36 is arranged downstream with respect to the connection of the first compressed air line 28 in the conveying line 25.
  • the downpipe 24 has an upper connection plate 37 facing the rotary valve 2. With the connection plate 37, the downpipe 24 is fastened, in particular flanged, to the rotary valve 2, in particular to the lower housing cover 15 in the area of the outlet opening 16.
  • the downpipe 24 has a substantially elongated cross-sectional shape.
  • the oblong hole-shaped contour of the cross-sectional conveying surface of the downpipe 24 comprises two oppositely arranged semicircular arcs 39 which are connected to one another by two straight sections 40 lying in between.
  • the cross-sectional area of the downpipe 24 is larger than the outlet opening 16.
  • the outlet opening 16 is completely covered by the cross-sectional area of the downpipe 24 in the area of the connection plate 37. All of the coal dust discharged from the rotary valve 2 via the outlet opening 16 reaches the downpipe 24 directly.
  • the downpipe 24 has a pipe longitudinal axis 38 which is oriented vertically. A conveying cross-sectional area of the Downpipe 24 decreases continuously along the downward conveying direction.
  • the cross-sectional conveying surface is designed to be double-symmetrical, with a first axis of symmetry running perpendicular to the straight sections 40 and the second axis of symmetry running perpendicular to the first axis of symmetry.
  • the contour of the cross-sectional conveying surface is in particular designed without kinks. The risk of coal dust adhering in kink areas of the downpipe 24 is avoided.
  • the circular arc-shaped contour sections of the downpipe 24 are implemented by two half-tubes 41 which are connected to one another by two triangular sheet metal inserts 42.
  • the two half-tubes 41 are oriented at an angle of inclination m to one another.
  • the angle of inclination m is 10 °.
  • the angle of inclination m is advantageously set in a range between 2 ° and 30 °, in particular in a range from 5 ° to 20 °.
  • At least one of the half-tubes 41 is inclined with respect to the vertical.
  • This half-tube 41 which is inclined relative to the vertical, has on its inside a sliding surface 43 for the coal dust.
  • the sliding surface is designed like a channel and in particular has a semicircular contour.
  • Lignite dust is discharged from the pulverized coal silo (not shown) into the intermediate container 4.
  • the coal dust in the intermediate container 4 is loosened by means of the agitator 8.
  • the loosened coal dust is fed into the rotary valve 2 by means of the agitator 8 through the inlet opening 13 in the upper housing cover 31 promoted and filled to the cellular wheel chambers 11, which are located below the inlet opening 13.
  • the cellular wheel 9 is driven via the gear motor 18 and the chain arranged in the chain housing 19.
  • the gear motor 18 is frequency-controlled.
  • the coal dust in the cellular wheel chambers 11 is conveyed to the outlet opening 16.
  • Compressed air is supplied via the second supply air opening 32 in the area of the starting section 22. This ensures that the coal dust is set in motion and thus remains fluid. Clogging of the coal dust is avoided. Because the initial section 22 has a comparatively small radial extent r A , the coal dust can be discharged evenly via the outlet opening 16 from the rotary valve 2 into the downpipe 24. This state is in Fig. 5 shown.
  • the amount of compressed air that is supplied via the first compressed air line 28 and / or via the second compressed air line 30 is variably adjustable.
  • the leakage air resulting from the emptying of the bucket wheel chamber 11 is sucked out of the respective bucket wheel chamber 11 via the suction opening 33 and the suction line 34 from the bucket wheel sluice 2 and fed to the delivery line 25.
  • the suction behavior is improved by the Venturi nozzle 35 integrated in the suction line 34.
  • a suction flow is generated in the suction line 34 through the Venturi nozzle 35.
  • the downpipe 24 serves as a slide. This prevents the discharged coal dust from falling vertically downward into the conveying line 25 without braking.
  • the coal dust is fed through the inclined sliding surface 43 of the downpipe 24 in a targeted and uniform manner on the conveying line 25.
  • the coal dust discharged via the downpipe 24 of the conveying line 25 and the leakage air sucked off via the suction line 34 pass in the conveying line 25 into the injector 36, which in particular has an injector nozzle (not shown).
  • the injector 36 which in particular has an injector nozzle (not shown).
  • the pulverized coal combustion device 1 ensures a uniform and continuous supply of pulverized coal from the rotary valve 2 into the burner 3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
EP20164103.2A 2019-04-18 2020-03-19 Dispositif de combustion du charbon pulvérisé Withdrawn EP3726133A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019205733.0A DE102019205733A1 (de) 2019-04-18 2019-04-18 Kohlenstaubverbrennungsvorrichtung

Publications (1)

Publication Number Publication Date
EP3726133A1 true EP3726133A1 (fr) 2020-10-21

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Application Number Title Priority Date Filing Date
EP20164103.2A Withdrawn EP3726133A1 (fr) 2019-04-18 2020-03-19 Dispositif de combustion du charbon pulvérisé

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EP (1) EP3726133A1 (fr)
DE (1) DE102019205733A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1772290A (en) * 1926-05-01 1930-08-05 Int Comb Eng Corp Apparatus for feeding pulverized fuel to furnaces
JPS54137869A (en) 1978-04-19 1979-10-25 Babcock Hitachi Kk Ep ash feeder
JPH0814531A (ja) 1994-06-30 1996-01-19 Ebara Corp 固体燃焼物の供給装置
EP1900659A1 (fr) * 2006-09-13 2008-03-19 Schenck Process GmbH Dispositif de décharge de produits en vrac à partir d'un conteneur de produits en vrac
WO2018196479A1 (fr) * 2017-04-26 2018-11-01 中冶赛迪工程技术股份有限公司 Dispositif d'alimentation de transport pneumatique et structure de raccordement de tuyau de transfert

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1772290A (en) * 1926-05-01 1930-08-05 Int Comb Eng Corp Apparatus for feeding pulverized fuel to furnaces
JPS54137869A (en) 1978-04-19 1979-10-25 Babcock Hitachi Kk Ep ash feeder
JPH0814531A (ja) 1994-06-30 1996-01-19 Ebara Corp 固体燃焼物の供給装置
EP1900659A1 (fr) * 2006-09-13 2008-03-19 Schenck Process GmbH Dispositif de décharge de produits en vrac à partir d'un conteneur de produits en vrac
WO2018196479A1 (fr) * 2017-04-26 2018-11-01 中冶赛迪工程技术股份有限公司 Dispositif d'alimentation de transport pneumatique et structure de raccordement de tuyau de transfert

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