US3900011A - Air supply means for a furnace - Google Patents

Air supply means for a furnace Download PDF

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Publication number
US3900011A
US3900011A US466503A US46650374A US3900011A US 3900011 A US3900011 A US 3900011A US 466503 A US466503 A US 466503A US 46650374 A US46650374 A US 46650374A US 3900011 A US3900011 A US 3900011A
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US
United States
Prior art keywords
sleeve
air
wall
passage
furnace
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
US466503A
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English (en)
Inventor
Hans Stenlund
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.)
Gotaverken Angteknik AB
Goetaverken Angteknik AB
Original Assignee
Goetaverken Angteknik AB
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 Goetaverken Angteknik AB filed Critical Goetaverken Angteknik AB
Application granted granted Critical
Publication of US3900011A publication Critical patent/US3900011A/en
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
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys

Definitions

  • the sleeve has a wider outer position and i a slanting middle portion, in which openings are [56 ⁇ References Cited provided. These openings normally serve to admit combustion air to pass by way of the sleeve, but their UNITED STATES PATENTS location permits tools to reach the clearance from 2,83 l Lange inside the sleeve 2.966109 l2/l960 Pegrum.
  • Cinder and ashes are in this manner blasted away from the passage.
  • the combustion within the furnace may be inspected through the sleeve, and occasionally tools may be introduced thereto for breaking away solidified combustion products clogging the air passage, or for lancing the fuel bed.
  • the clearance around the sleeve is very sensitive to being clogged, which occasionally occurs due to molten combustion residues. A throttling of the flow will disturb the air balance and it is necessary rapidly to remove the obstacle. With the old type of sleeve controlled air means the annular clearance was not available without removing the sleeve.
  • the present invention proposes an air supply means of above mentioned type, where the volume of air passing through the clearance remains constant, so a continuous blasting of the passage is obtained, while a regulation of the total volume supplied through the passage is obtained by governing the volume flowing by way of the sleeve.
  • the sleeve is designed in such a manner that the clearance around the mouth of the sleeve is accessible for cleaning.
  • FIG. I is a perspective view of the outside of a furnace wall
  • FIG. 2 shows a horizontal section through an air supply means.
  • the air supply means shown in the drawing is adapted to be used with a furnace for the combustion of cellulose black liquor.
  • the walls of the furnace are defined by water cooled tubes 10, which are interconnected by fins ll welded together to form a gas tight wall. By bending apart two adjacent tubes an opening for supplying air to the furnace will be obtained. A number of such openings are located in a row and are connected to an air box 12 fitted along the outside of the furnace wall.
  • a sleeve 13 which extends from the furnace wall right through the air box, being hermetically fitted to an opening in the wall, 14, of the air box remote from the furnace wall.
  • a lid 15 is fitted to close said opening.
  • each passage in the furnace wall there is an insert 16, having smooth internal walls defining a passage facilitating the flow of air.
  • the shape of the passage will be elongated, and the mating sleeve will mainly be defined by its two side walls.
  • the upper and lower walls interconnecting'the side walls are comparatively unimportant.
  • Each side wall includes an inward portion 17 and an outward portion 18.
  • the said portions of the two side walls are mutually parallel and the inward and the outward portions of a side wall are interconnected by an intermediate wall portion 19 located at an angle to the other portions.
  • the distance between the two outward portions 17 is somewhat less than the breadth of the passage through the insert 16, whereby clearances 20 are formed. Similar clearances are also provided along the upper and the lower walls of the sleeve. These clearances communicate with the air box, and in use a steady flow of air is obtained therethrough, which blasts away cinder and ash particles collecting in the passage.
  • the width of the clearances is initially selected with due consideration to known parameters, so a high degree of blasting efficiency is obtained.
  • intermediate wall portions 19 is provided with an opening 21 through which air may flow into the sleeve.
  • dampers 22 are movable forwards and backwards by means of a mechanism 23 including rods and a handle 24 extending outside the lid 15.
  • the lid further, is provided with an inspection window 25, and an opening 26 for the introduction of tools, said opening having an automatically closing cover.
  • dampers 22 When it is desirable to lance the fuel bed both dampers 22 are moved to closed position. The air will then pass through the clearances 20 only, which causes a sub-pressure within sleeve 13. This will prevent the preheated combustion air from blowing backwards through the sleeve, towards the operator.
  • the outer wall portions 18 are located at such distance from each other that the intermediate wall portions will be sufficiently angled to permit the introduction of a tool for clearing the clearances 20, from inside the sleeve, the tool passing through the nearest opening 21 along the outside of the inward wall portion 17. Clotted residues may occasionally collect in the clearances 20 and will not be removed merely by blasting. During such clearing operation it is preferable, momentarily to lower the pressure within the air box.
  • an air supply means for a furnace defined by walls having air passages, at least one air box fitted outside one of said walls and defined by at least one wall remote from the said one furnace wall for supplying air to a number of said passages, a control means at each of said passages including a sleeve having an end portion extending into the passage and having a narrower cross sectional area than that of the passage, to leave an annular clearance around its perimeter through which the air box communicates with the furnace, each of said sleeves extending from the said furnace wall to the said one air box wall, means for hermetically attaching each of the sleeves to the associated air box wall, an inspection opening being provided in the said one air box wall within the location where a sleeve is attached as well as means to close said inspection opening, air passage openings being provided in respective walls of each of said sleeves, adjustable closure means provided on each of the sleeves for cooperating therewith for regulating the flow of air to the furnace by way I of the sleeve, wherein each passage is elongated, being considerably higher than

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Paper (AREA)
US466503A 1973-05-25 1974-05-02 Air supply means for a furnace Expired - Lifetime US3900011A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7307367A SE375848B (pt) 1973-05-25 1973-05-25

Publications (1)

Publication Number Publication Date
US3900011A true US3900011A (en) 1975-08-19

Family

ID=20317590

Family Applications (1)

Application Number Title Priority Date Filing Date
US466503A Expired - Lifetime US3900011A (en) 1973-05-25 1974-05-02 Air supply means for a furnace

Country Status (8)

Country Link
US (1) US3900011A (pt)
JP (1) JPS5049874A (pt)
BR (1) BR7404250D0 (pt)
CA (1) CA1000564A (pt)
FI (1) FI54406C (pt)
FR (1) FR2230938B1 (pt)
GB (1) GB1434316A (pt)
SE (1) SE375848B (pt)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027604A (en) * 1974-10-07 1977-06-07 Gotaverken Angteknik Ab Means for governing the air supply to a furnace
US4099471A (en) * 1975-11-24 1978-07-11 Combustion Engineering, Inc. Apparatus for cleaning the air nozzles and regulating air flow thereto in chemical recovery boilers
US4653409A (en) * 1985-02-13 1987-03-31 Lt-Produkter Skutskar Ab Apparatus for regulating and cleaning an air passage in the wall of a furnace
US4848248A (en) * 1987-01-29 1989-07-18 L. & C. Steinmuller Gmbh Tuyere for the introduction of a reaction medium into a hot gas
US6672227B2 (en) * 2000-02-18 2004-01-06 Kvaerner Pulping Ab Arrangement for cleaning, airflow control and pushing away melt in air ports of incineration boilers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831535A (en) * 1953-12-28 1958-04-22 Peabody Engineering Corp Fuel burner
US2966209A (en) * 1956-05-28 1960-12-27 Babcock & Wilcox Ltd Flame responsive means
US3361419A (en) * 1966-05-10 1968-01-02 Selas Corp Of America Air preheating burner with furnace preheating passage cleaner means
US3742916A (en) * 1971-01-07 1973-07-03 Goetaverken Angteknik Ab Arrangement for cleaning an air passage in the wall of a refuse burning furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831535A (en) * 1953-12-28 1958-04-22 Peabody Engineering Corp Fuel burner
US2966209A (en) * 1956-05-28 1960-12-27 Babcock & Wilcox Ltd Flame responsive means
US3361419A (en) * 1966-05-10 1968-01-02 Selas Corp Of America Air preheating burner with furnace preheating passage cleaner means
US3742916A (en) * 1971-01-07 1973-07-03 Goetaverken Angteknik Ab Arrangement for cleaning an air passage in the wall of a refuse burning furnace

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027604A (en) * 1974-10-07 1977-06-07 Gotaverken Angteknik Ab Means for governing the air supply to a furnace
US4099471A (en) * 1975-11-24 1978-07-11 Combustion Engineering, Inc. Apparatus for cleaning the air nozzles and regulating air flow thereto in chemical recovery boilers
US4653409A (en) * 1985-02-13 1987-03-31 Lt-Produkter Skutskar Ab Apparatus for regulating and cleaning an air passage in the wall of a furnace
US4848248A (en) * 1987-01-29 1989-07-18 L. & C. Steinmuller Gmbh Tuyere for the introduction of a reaction medium into a hot gas
US6672227B2 (en) * 2000-02-18 2004-01-06 Kvaerner Pulping Ab Arrangement for cleaning, airflow control and pushing away melt in air ports of incineration boilers

Also Published As

Publication number Publication date
JPS5049874A (pt) 1975-05-02
FI106374A (pt) 1974-11-26
FI54406C (fi) 1978-11-10
SE375848B (pt) 1975-04-28
CA1000564A (en) 1976-11-30
GB1434316A (en) 1976-05-05
FR2230938B1 (pt) 1979-05-25
FR2230938A1 (pt) 1974-12-20
FI54406B (fi) 1978-07-31
BR7404250D0 (pt) 1975-01-07

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