US3831535A - Wood waste burner system - Google Patents

Wood waste burner system Download PDF

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US3831535A
US3831535A US00412474A US41247473A US3831535A US 3831535 A US3831535 A US 3831535A US 00412474 A US00412474 A US 00412474A US 41247473 A US41247473 A US 41247473A US 3831535 A US3831535 A US 3831535A
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Prior art keywords
wood
air
separator
chamber
conical section
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US00412474A
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A Baardson
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ROBBINS EH
MILL CONVERSION CONTRACTOR Inc
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MILL CONVERSION CONTRACTOR Inc
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Priority to US00412474A priority Critical patent/US3831535A/en
Priority to JP49020340A priority patent/JPS5078168A/ja
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Assigned to BAARDSON, ANDREW B., reassignment BAARDSON, ANDREW B., ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BUTTS, ROBERT, TRUSTEE FOR MILL CONVERSION CONTRACTOR. INC., BANKRUPT.
Assigned to ROBBINS, E.H. reassignment ROBBINS, E.H. ASSIGNMENT OF 1/2 OF ASSIGNORS INTEREST Assignors: BAARDSON, ANDREW B.
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/32—Incineration of waste; Incinerator constructions; Details, accessories or control therefor the waste being subjected to a whirling movement, e.g. cyclonic incinerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/10—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses
    • F23G7/105—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses of wood waste
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators

Definitions

  • the Present invention Provides a System y means of 51 1111. 1:1. F23g 7/00 which Waste Wood, as Well as the fumes emitted y [58] 116111 of Search 110/7 R, 7 A, 8 R, 8 A, heer being dried, are burned in Such a manner as to basically accomplish two things, namely, provide lar e 110/8 C, 102 g amounts of heat energy that was formerly wasted and, [56] References Cited secondly, substantially reduce the emission of pollut- UNITED STATES P E ants. hi $3 591?
  • the present invention relates to the lumber mill field in general and more particularly relates to a system for the effective utilization of wood waste material and other by-products of the lumber mill industry.
  • Lumber mills generate tons of waste wood daily and not all of it can be used for barkdust, chipboard or other commercial products. More particularly, in the manufacture and processing of lumber and lumber mill products, various kinds of wood materials are developed with which little can be done and which are therefore looked upon and treated as waste. For example, in a plywood mill, the surface of the plywood is finished by sanding the plywood and, as a result thereof, there is produced a sander dust that is difficult to handle because it is stringy, balls up, has a tendency to bridge, is difficult to measure quantitatively, presents a fire and explosion hazard, and is generally a nuisance to handle.
  • waste wood known as hog fuel, so called because it has been sized by being fed through a chipper or hog.
  • wood waste materials produced as by-products, such as bark, shavings, trimmings, sawdust, and the like. Some of the materials mentioned are usually wet or damp to one degree or another, such as the bark and sawdust, which further complicates the practical use of them. Accordingly, in the past, these materials have gone as waste wood and, in the main, have been gotten rid of by burning them in what are known as Wigwam burners. Unfortunately, however, one of the effects of this type of burning has been the injection or emission into the atmosphere of large amounts of pollutants, such as, smoke and ash, various kinds of chemical emissions, uncombustible particles, and the like.
  • the present invention provides such a system, the essence of the system lying in utilizing and consuming both the waste wood and the fumes as a fuel, the heat generated thereby being used to dry the veneer or raw wood, to operate a boiler, etc., with the remainder being fed into the atmosphere devoid of most pollutants. More particularly, in a system according to the present invention, the waste wood is first reduced to a dry powdery form so that it can be used as a fuel.
  • the products of combustion are then fed to a unit that separates out the impurities from the hot gases, a portion of the clean hot gases then being directed to the dryer from which the fumes are channeled back to the burner, as previously mentioned.
  • the remaining hot gases may either be vented to atmosphere or else use-d elsewhere as an energy source, such as to operate a boiler system or the like.
  • an object of the present invention to provide a system that makes effective use of waste wood and veneer or raw wood gas emissions as a fuel.
  • FIG. 1 is a block diagram of the basic units or components of a system according to the present invention
  • FIG. 2 illustrates the FIG. 1 embodiment in greater detail in that it breaks down the blocks in FIG. 1 to the apparatus included in them.
  • FIG. 3 is a cross-sectional view ofthe burner unit included in and playing such a vital role in a system according to the present invention, and illustrates the combustion and blending chambers therein.
  • FIG. 4 is a front view of one of the elements included in the construction of the FIG. 3' burner unit
  • FIG. 5 is a side view, partially in cross-section, of the wood fuel supply and dispersion apparatus included in the construction of the FIG. 3 burner unit;
  • FIG. 5(a) is an end-view of the FIG. 5 apparatus
  • FIG. 6 is an elevation view, partially in crosssection, of a reverse flow particulate separator that constitutes one of the basic units shown in FIG. 1.
  • FIG. 6(a) is a cross-sectional view of the FIG. 6 apparatus taken along the broken line AA and in the direction of the arrows at the ends thereof;
  • FIG. 7 is a block diagram showing a modification to a portion of the FIG. 1 system.
  • a system according to the invention is shown to basically comprise a metered wood fuel source 10 coupled on its input end to receive raw waste wood, such as the hog fuel, bark, shavings, etc., mentioned earlier, and coupled on its output end to a burner 11 having two chambers, namely, a combustion chamber 12 and a blending chamber 13.
  • the raw waste wood is dried and ground up in wood fuel source 10 to a fine powdery form, and thereafter metered out to the burner on the basis of need as determined by the operating conditions of the system.
  • the wood fuel along with an ample supply of air, is conveyed to combustion chamber 12 where it is combusted or burned.
  • combustion chamber 12 to assure total combustion of the wood and, also, for purposes of temperature control, an additional supply of air is fed to the combustion chamber by secondary air source 14.
  • secondary air source 14 to assure total combustion of the wood and, also, for purposes of temperature control.
  • the products of combustion out of combustion chamber 12 are fed to blending chamber 13, to which are also fed certain gaseous emissions from the veneer or other wood materials being dried in dryer 16. More particularly, as was previously mentioned, when veneer or other wood products are dried, they give off gaseous materials that are combustible. It is these gaseous emissions that are fed back to the blending chamber, as shown in the figure, when they are mixed with the products of combustion out of the combustion chamber and then burned. This final product of combustion then flows into a separator unit 17 which functions to filter out incombustible impurities from the hot gaseous emerging from the blending chamber, thereby leaving the gases substantially free from these impurities.
  • a major portion of the hot gases out of the separator Unit is directed through a damper 18 to the dryer, the remainder of the gases passing into the atmosphere.
  • the damper controls the amount of hot gases flowing to the dryer and is operated in response to the temperature signal applied to it via line 20, the damper thereby helping to maintain the proper temperature in the dryer.
  • a fuel metering signal that is developed in the separator unit and fed back to metered wood fuel source 10 via line 21.
  • the fuel metering signal controls or meters the amount of wood fuel that is fed to burner 11 for combustion and, therefore, controls the quantity and the temperature of these hot gases.
  • FIG. 1 system is presented in greater detail in FIG. 2 to which reference is now made, the same numerical designations being used in FIG. 2 as were used in FIG. 1 wherever appropriate.
  • the raw waste wood is fed by means of a high pressure air line 23 to a cyclone and rotary feeder mechanism 24.
  • the high pressure in the line forces the waste wood toward the system and a blower (not shown) is used at the far or input end of the line to supply the needed air pressure.
  • the cyclone and rotary feeder mechanism performs the dual function of retrieving the air or, stated differently, of separating the air from the wood, and of then feeding the wood to a shaker screen apparatus 25.
  • Cyclone and rotary feeder mechanism 24 is a standard piece of equipment frequently used in the lumber field and, therefore, its construction, operation and use is well known to those skilled in the art. Accordingly, suffice it to say that as the air and wood enter mechanism 24, the rotary feeder therein seals off the air and thereby prevents it from continuing with the wood to the shaker screen apparatus. The air that is thusly separated out is funnelled up through the center of the cyclone portion or member of mechanism 24 and out into line 26 which directs the air to a rotary feeder 27.
  • shaker screen 25 the raw waste wood is first shaken out to separate the finer wood material from the coarser pieces. In so doing, the fine particles of wood are discharged onto rotary feeder 27 where they are again mixed with the air coming from line 26 to be pneumatically conveyed to another cyclone and rotary feeder mechanism 28. As for the coarser pieces and chunks of wood in shaker screen 25, these are conveyed by a screw conveyor device 30 to a pulverator 31 which, as its name implies, literally hammers or pulverizes the wood into finer pieces.
  • the reduced wood is conveyed back to the shaker screen unit by a second screw conveyor 32 where the process is repeated, that is to say, the wood is shaken out with the finer particles passing through the screen and thereafter conveyed to rotary feeder 27, whereas the still coarse pieces of wood are returned to the pulverator for further size reduction.
  • This process is repeated until all of the raw wood is ultimately reduced to a relatively fine particle size and passed to rotary feeder 27.
  • shaker screen 25, as well as pulverator 31 and screw conveyors 30 and 32 are all well known in the art and, therefore, no further description of them is deemed necessary here.
  • the air in pressure line 26 picks up the fine particles of wood in rotary feeder 27 and conveys them to cyclone and rotary feeder mechanism 28 which functions in the same manner as cyclone and rotary feeder mechanism 24. Accordingly, mechanism 28 separates the air from the fine particles of wood which then pass into a large storage bin, the air continuing down the pressure line designated 34.
  • the particles of wood stored in bin 33 constitute the wood fuel mentioned in the earlier description of FIG. 1. Coupled to the storage bin is an endless chain type of device 35 that scoops up the wood in the bottom of the bin and conveys it to a feeder device 36 that is metered to provide the right amount of said wood fuel to burner ll.
  • the particles of wood feed to the feeder device are forced down duct 37 by the highpressure air coming from line 34, a fan 38 helping the process by pulling the air and the wood toward the burner.
  • the metering mechanism in feeder device 36 may be a motor-driven damper or any one of a number of other commerically available mechanisms that can be adapted for use herein. In any event, the metering mechanism acts acts in response to a signal from controls unit 40 to either reduce or increase the amount of wood fuel permitted to enter duct 37 according to the needs of the system. Of course, any wood fuel conveyed to feeder device 36 but which does not enter duct 37 is returned to storage bin 33.
  • the wood fuel is finely divided and, therefore, is held in suspension by the air as it moves or flows down ducts or pipes 37 and 41 toward burner 11.
  • the fuel and combustion air are introduced into combustion chamber 12 in such a way that a vortex flow is established therein to aid in the process of combustion, additional or secondary combustion air being supplied to the combustion chamber by means of fan 42 and pipe 43 for the reasons previously mentioned.
  • a natural gas or propane source is provided as a pilot light, for pre-heating purposes, and as a standby auxiliary fuel source.
  • the products of combustion out of chamber 12 are passed to blending chamber 13 to which are also fed the gas emissions originating in dryer 16. These emissions are fed to the blending chamber via duct 44, a dryer vent return air fan 45 being used to aid in this process by sucking the fumes from the dryer and feeding them directly into the blending chamber.
  • the final products of combustion coming from the blending chamber are then fed to separator 17 via a refractory lined duct 46 referred to as a blendalator, the function of the blendalator being to provide a transitional stage between the burner and the separator. Any combustion of the wood fuel and the emissions still remaining to be completed takes place in the blendalator, so that the blendalator insures that the process of combustion is fully completed before the product thereof is fed into the separator.
  • Separator 17, as mentioned earlier in connection with FIG. 1, separates or filters out the various uncombustible impurities that are part of the product of combustion and which may be of microscopic size, such as particles of iron and silica, with the result that the hot gases emerging from the separator are substantially pure.
  • a portion of these hot gases are then fed to dryer l6 and this is done via a duct47, the remainder of the hot gases being vented into the atmosphere through a stack 48 in which is located a damper mechanism for use in controlling the amount of hot gas to be vented and, therefore, the amount to be channeled to the dryer.
  • thermocouple sensing element is located in dryer 16 and this thermocouple device feeds a temperature signal to the control unit which, in response thereto, and by means of a pneumatic signal, operates the damper in stack 48 to vary the amount of hot gas flowing to the dryer according to its needs.
  • a thermocouple sensing element is also located in separator l7 and this thermocouple device likewise sends a temperature signal to the control unit.
  • the control unit applies an electrical signal to the metering mechanism in feeder device 36, the metering mechanism, in response thereto, operating to increase or decrease the amount of wood fuel out of the feeder device and, therefore, the amount of wood fuel fed to the burner.
  • burner 11 is a two-stage structure in which combustion chamber 12 constitutes the first stage and blending chamber 13 the second stage.
  • the burner is cylindrically-shaped and generally symetrical about its center line, the two chambers being lined with a refractory material, such as high alumina firebrick 50 lining the combustion chamber and castable fireclay 51 around the blending chamber.
  • a product deflector unit comprising a burner tube 53 that is coupled at its input end to burner fan 38 and at its output end to the chamber 54 in which the combustion of the wood fuel is initiated.
  • the burner tube is cylindrically-shaped and has a series of dispersion vanes 55 mounted peripherally around the inside of the tube near its input end, the dispersion vanes being positioned at such an angle that the combustion of combustion air and wood fuel held in suspension therein is deflected into a counterclockwise movement or rotation as it flows by the dispersion vanes into the burner tube.
  • One angle that has been found to be suitable for said purpose is the angle of 45 as formed by the plane of each vane and the center line of the burner tube.
  • dispersion vanes 55 are located at the input end of the burner tube.
  • deflector apparatus At the output end of the burner tube and extending partially into chamber 54 is deflector apparatus, generally designated 56, that comprises a nosecone section 57 at its forward end and a conical deflector section 58 at its rearward end, the two conical sections being separated by a pair of concentric pipe sections 60 and 61 respectively used for housing and support purposes.
  • a support base 62 Mounted within pipe 60 and abutting against nose-cone section 57 is a support base 62, a bolt 63 extending through this support base and the nosecone section as shown in FIG. 5.
  • a jamb nut 64 is tightly wound on the bolt so as to firmly or rigidly hold the nosecone section in place between the support base and the nut.
  • brackets 65 which are mounted between pipe 60 and the wall of burner tube 53, and is best shown in FIG. 5.
  • brackets 65 centrally fix the position of pipes 60 and 61 inside the burner tube and the pipes, in turn, aid in holding cone sections 57 and 58 in position.
  • a backing plate 66 is mounted on and covers the base of conical section 58, the junction between the plate and the conical section being filled in to form an annular concave-shaped fillet 67 that pro vides s smooth transition from the surface of the conical section to that of the plate.
  • fillet 67 plays an important role in the process of deflecting the wood fuel product as it passes through the burner tube on the way to the combustion chamber.
  • a deflector ring 68 that is held in position by the wall of burner tube 53 at the junction of conical section 58 and pipe 60, the ring being tapered or angled along its inside surface 68a so as to deflect gases and wood fuel passing through it toward conical section 58.
  • the entrance to combustion chamber 54 includes an entrance port 70 through which product deflector unit 52 extends toward the combustion chamber and at the input end of which there is mounted a gas ring burner 71.
  • the gas ring burner is illustrated in both FIGS. 3 and 4 and, as shown therein, is hollow, has openings or orifices 71a along its entire circular inner surface or periphery, and, by means of pipe 7 lb, is connected to natural gas or propane source 15.
  • the opening or passageway through the center of gas burner ring 71, the opening being designated 710 is approximately the same size or diameter as that of entrance port 70 to which it is adjacent. Accordingly, any gases flowing through ring opening 710 thereafter flow smoothly into entrance port 70.
  • the significance of gas burner ring 71 will be pointed out hereinbelow.
  • chamber 54 is enclosed by a wall of firebrick 50.
  • the said outer wall which is also the outer wall of combustion chamber 12, the said outer wall being designated 11a, is a passageway 72 that is connected to combustion air fan 42 by means of duct 43.
  • chamber 54 in a concentric arrangement, is chamber 54, firebrick wall 50, passageway 72 and outer burner wall 11.
  • air provided by air fan 42 flows through passageway 72 in the direction of the arrows therein and thereafter passes through gas burner ring 71 and entrance port 70 into chamber 54.
  • air is also supplied directly to the chamber by means of channels or passageways through firebrick wall 50, that interconnects chamber 54 with passageway 72, there being several such channels through the wall located at different points therealong both axially and circumferentially.
  • the channels shown in FIG. 3 are designated 73 and they are arranged in a sortof helical path around the wall of the chamber so as to produce a helical vortex type of flow pattern having a counterclockwise movement or rotation.
  • Exit port 74 located, as its name implies, at the output end of chamber 54. Exit port 74 leads to blending chamber 13 and the products of combustion leaving chamber 54 pass through port 74 on their way to the blending chamber.
  • Blending chamber 13 is similar to combustion chamber 12 in several respects in that it also includes a chamber 75 formed by a wall of refractory material 51 and with entrance and exit ports 76 and 77, respectively, at its input and output ends.
  • the blending chamber and what goes on inside it constitutes the second stage of burner 11 and, in this regard, it is therefore coupled to the combustion chamber by means of entrance port 76 which, as the figure illustrates, is in communications with exit port 74.
  • entrance port 76 which, as the figure illustrates, is in communications with exit port 74.
  • return vent fan 45 Coupled to this second stage is return vent fan 45 which, as previously indicated, feeds the combustible gases fromthe dryer to chamber 75.
  • dispersion vanes 55 cause the wood fuel to become evenly dispersed in the air that carries them so as to provide a uniform cross-sectional wood particle density.
  • the air and wood fuel combination moves down burner tube 53 in the aforementioned manner until it reaches nose cone section 57 where the center portion of this mass of air and wood is deflected outwardly and forced to pass through the space between pipe 61 and the burner tube wall.
  • the air and wood continues to turn in a counterclockwise direction as it moves forward through this space.
  • deflector ring 68 the outermost portion of it impinges upon deflecting surface 680 which forces it downwardly where, together with the other air and wood passing through this space, it impinges upon the forward part of conical section 58.
  • the air and wood particles still in a counterclockwise rotational movement, move along or follow the surface of the conical section until they reach backing plate 66 and fillet 67 where the entire mass of air and wood fuel is smoothly channeled or turned outwardly toward wall 50 in chamber 54.
  • the wood particles are ignited due to the high temperature at the walls surface, which temperature may be in the range between 2,2002,400 F.
  • the wood particles are deflected by the wall of chamber 54 and they then move into and through the chamber as they continue and complete the combustion process. During this period of time, the wood continues to move in a helical path toward exit port 74.
  • the products of combustion obtained in combustion chamber 12 pass through ports 74 and 76 into blending chamber 13 where, in chamber 75, these products of combustion are mixed with the combustible emissions coming from dryer 16. It should be mentioned at this point that while a portion of the wood fuel is consumed in the combustion chamber, another portion continues to burn as it enters chamber 75. Accordingly, the dryers fumes or emissions are ignited in the blending chamber and burn with the remaining wood fuel, the resultant output from the blending chamber going through exit port 77 and into blendalator 46 where any combustion of the wood fuel and the emissions still remaining to be completed takes place.
  • the blendalator is a transitional member that insures that the process of combustion is fully completed before the products thereof are fed into separator unit 117.
  • chamber 75 is larger than chamber 54 and, therefore, that the products of combustion expand as they enter chamber 75. It should further be mentioned that the heat generated in chamber 54 due to the burning of the wood fuel there is more intense than the heat generated in chamber 75. The overall effect, therefore, is that the temperature of chamber 75 is maintained between l,200- l ,600" F 800-l ,000 cooler than chamber 54. As in the blending chamber, the temperature in blendalator 46 will range between l,200-l ,600 F., as will the final products of combustion passing through the blendalator on their way to the separator.
  • Separator unit 17 is illustrated in detail in FIGS. 6 and 6(0) and, as shown therein, is shaped like a tank that includes a tank wall 80 lined along 'its inside surface with refractory brick 81.
  • the floor of the separator is also lined with this protective refractory brick.
  • On the floor of the separator is mounted a box 82 that extends from about the center of the floor to the separator wall. The box is completely enclosed except for an opening 820 through its top wall, at that end of the box that is at the center of the separator floor, and a door 821) at its extremity near the separator wall.
  • a plurality of directional louvres 84 that are mounted between top sup porting plates 85 and a bottom support member 86. As is indicated by the names given them, plates 85 and member 86 sandwich the louvres in between them and hold the louvres rigidly in place, As is shown in FIG. 6(a), the louvres are arranged in a circular pattern with the forward end of one louvre being parallel to and spaced from the rearward end of the next adjacent lou vre. Stated differently, the louvres are arranged so that air circulating on the outside of them will be forced to pass between them to the space inside of them.
  • a truncated conical section 87 Mounted between support member 86 and opening 82a in box 82 is a truncated conical section 87 that is coupled and held to member 86 by means of several support brackets 88 extending from the wall of the separator.
  • the conical section is open at both ends, the narrow end, which is the lower end, being superimposed on opening 82a so that any particulate matter falling or dropping down on the inside of the conical section will thereby enter the box.
  • another, much smaller, cone 89 is located and mounted at the bottom end of conical section 87 so that the two together resemble the letter W in the alphabet.
  • Cone 89 is held to cone 87 by means of bars 9 0 shown in FIG. 6(a) and as is also shown therein, the two conical sections form an annular or ring-shaped opening between them through which the abovesaid particulate matter passes to box 82.
  • the apex or top of cone 89 is closed.
  • the separator is a con tinuation of the blendalator and, therefore, is similarly designated.
  • the opening to the separator is hidden by member 46 and is not illustrated in FlGS. 6 and 6(a) for sake of clarity. Such an opening through the wall of the separator can surely be visualized by anyone skilled in the art.
  • the space between the wall of the separator and conical section 87 has been designated 91 and it is into this space, which acts like an expansion chamber, that the products of combustion are fed.
  • the space between the wall of the separator and louvres 84 have been designated 92, the space within the louvres being designated 93.
  • the hot gas entering the separator enters space 91 at a fairly high speed and enters in such a manner as to move in a counterclockwise direction around conical section 87. Because hot gases normally rise and, furthermore, because of the pressure behind it, the gas entering the separator moves up along conical section 87 in chamber 91, all the while rotating in a counterclockwise direction as it does so. Accordingly, the path followed by the gas is a helical one.
  • the primary function of the separator unit is to separate out various kinds of uncombustible inorganic matter, such as particles of iron, silica, and the like, and this is done in the hollow of conical section 87 by the centrifuge action produced there.
  • the particles collect, more or less, along the inner surface of the cone and fall or slide along it through opening 82a into box 82.
  • the box is, of course, periodically emptied of these accumulations through door 82b.
  • said apparatus includes a high-pressure air line for transporting the raw waste wood; a first cyclone and rotary feeder mechanism coupled to said air line, said cyclone and rotary feeder mechanism including first means for separating the air from the wood, and second means for thereafter feeding the wood to a shaker screen mechanism; a shaker screen mechanism for separating the fine particles of wood from the coarser pieces, said shaker screen mechanism including third means for discharging said fine wood particles into said air line for pneumatic conveyance to a second cyclone and rotary feeder mechanism, and fourth means for conveying said coarse pieces of wood to a pulverator; a pulverator for comminuting said coarse pieces of wood to produce fine particles thereof, said pulverator including fifth means for conveying said fine particles of wood back to said shaker screen mechanism which, in turn, discharges them by means of said third means into said air line for conveyance to said second cyclone and rotary feeder mechanism; a second cyclone and rotary feeder mechanism including sixth means for separating the
  • said burner includes a deflector unit coupled at its input end to said air line and storage bin to receive wood fuel suspended in air therefrom and coupled at its output end to said first chamber, said deflector unit including a plurality of dispersion vanes mounted at its input end and positioned at such an angle as to cause said air and wood fuel to move in a counterclockwise manner as it flows therethrough toward the output end of said deflector unit, and including deflector apparatus mounted at its output end to deflect said air and wood fuel outwardly toward the outer walls of said first chamber.
  • said means in said separator includes a hollow and truncated conical section that is open at its apex and base, said conical section being mounted inside said separator with its apex vertically beneath its base, a plurality of louvres mounted in a circular manner above the base of said conical section, and an outlet duct mounted substantially at the center of said louvre arrangement and extending through the roof of said separator, said duct being open at its two ends; said separator including input apparatus by means of which the products of combustion out of said second chamber are directed in a counterclockwise movement around the apex of said conical section and upwards therealong.
  • said apparatus includes a high-pressure air line for transporting the raw waste wood; a first cyclone and rotary feeder mechanism coupled to said air line, said cyclone and rotary feeder mechanism including first means for separating the air from the wood, and second means for thereafter feeding the wood to a shaker screen mechanism; a shaker screen mechanism for separating the fine particles of wood from the coarser pieces, said shaker screen mechanism including third means for discharging said fine wood particles into said air line for pneumatic conveyance to a second cyclone and rotary feeder mechanism, and fourth means for conveying said coarse pieces of wood to a pulverator; a pulverator for comminuting said coarse pieces of wood to produce fine particles thereof, said pulverator including fifth means for conveying said fine particles of wood back to said shaker screen mechanism which, in turn, discharges them by means of said third means into said air line for conveyance to said second cyclone and rotary feeder mechanism; a second cyclone and rotary feeder mechanism including sixth means for separating the
  • said apparatus includes a high-pressure air line for transporting the raw waste wood; a first cyclone and rotary feeder mechanism coupled to said air line, said cyclone and rotary feeder mechanism coupled to said air line, said cyclone and rotary feeder mechanism including first means for separating the air from the wood, and second means for thereafter feeding the wood to a shaker screen mechanism; a shaker screen mechanism for separating the fine particles of wood from the coarser pieces, said shaker screen mechanism including third means for discharging said fine wood particles into said air line for pneumatic conveyance to a second cyclone and rotary feeder mechanism, and fourth means for' conveying said coarse pieces of wood to a pulverator; a pulverator for comminuting said coarse pieces of wood to produce fine particles thereof, said pulverator including fifth means for conveying said fine particles of wood back to said shaker screen mechanism which, in turn, discharges them by means of said third means into said air line for conveyance to said second cyclone and rotary feeder mechanism; a
  • said burner includes a deflector unit coupled at its input end to said air line and storage bin to receive wood fuel suspended in air therefrom and coupled at its output end to said first chamber, said deflector unit including a plurality of dispersion vanes mounted at its input end and positioned at such an angle as to cause said air and wood fuel to move in a counterclockwise manner as it flows therethrough toward the output end of said deflector unit, and including deflector apparatus mounted at its output end to deflect said air and wood fuel outwardly toward the outer walls of said first chamber; and wherein said means in said separator includes a hollow and truncated conical section that is open at its apex and base, said conical section being mounted inside said separator with its apex vertically beneath its base, a plurality of louvres mounted in a circular manner above the base of said conical section, and an outlet duct mounted substantially at the center of said louvre arrangement and extending through the roof of said separator, said duct being open at
  • said apparatus includes a high-pressure air line for transporting the raw waste wood; a first cyclone and rotary feeder mechanism coupled to said air line, said cyclone and rotary feeder mechanism including first means for separating the air from the wood, and second means for thereafter feeding the wood to a shaker screen mechanism; a shaker screen mechanism for separating the fine particles of wood from the coarser pieces, said shaker screen mechanism including third means for discharging said fine wood particles into said air line for pneumatic conveyance to a second cyclone and rotary feeder mechanism, and fourth means for conveying said coarse pieces of wood to a pulverator; a pulverator for comminuting said coarse pieces of wood to produce fine particles thereof, said pulverator including fifth means for conveying said fine particles of wood back to said shaker screen mechanism which, in turn, discharges them by means of said third means into said air line for conveyance to said second cyclone and rotary feeder mechanism; a second cyclone and rotary feeder mechanism including sixth means for separating the
  • said system further includes a first network for metering the amount of wood fuel fed to said burner in accordance with the temperature conditions in said separator, said first network including a first heat-sensitive device mounted in said separator for monitoring the temperature therein, said first device being operable in response to said temperature conditions to produce a first signal corresponding thereto, and a second device included in said fourth means for metering the amount of wood fuel fed to said first chamber in response to said first signal; and wherein said system further includes a second network for metering the amount of hot gas fed to the dryer in accordance with the temperature conditions therein, said second network including a second heat-sensitive device mounted in the dryer for monitoring the temperature therein, said second device being operable in response to said temperature conditions to produce a second signal corresponding thereto, and a damper device mounted between the dryer and said separator, said damper device being operable in response to said second signal to meter the amount of hot gas flowing from said separator to the dryer in accordance with the temperature conditions therein.
  • said apparatus includes a high-pressure air line for transporting the raw waste wood; a first cyclone and rotary feeder mechanism coupled to said air line, said cyclone and rotary feeder mechanism including first means for separating the air from the wood, and second means for thereafter feeding the wood to a shaker screen mechanism; a shaker screen mechanism for separating the fine particles of wood from the coarser pieces, said shaker screen mechanism including third means for discharging said fine wood particles into said air line for pneumatic conveyance to a second cyclone and rotary feeder mechanism, and fourth means for conveying said coarse pieces of wood to a pulverator; a pulverator for comminuting said coarse pieces of wood to produce fine particles thereof, said pulverator including fifth means for conveying said fine particles of wood back to said shaker screen mechanism which, in turn, discharges them by means of said third means into said air line for conveyance to said second cyclone and rotary feeder mechanism; a second cyclone and rotary feeder mechanism including sixth means for
  • said deflector apparatus includes first and second conical sections at its forward and rearward ends, respectively, the base of said rearward conical section including structure to smoothly divert said air-suspended wood fuel radially outwardly toward the walls of said first chamher; and wherein said deflector apparatus further includes a deflector ring whose inside surface is angled to deflect any air-suspended wood fuel coming into contact with it toward said rearward conical section.
  • said burner further includes a supplementary air supply arrangement to provide additional air for combustion in said first chamber, said arrangement including a plurality of orifices through the wall of said first chamber and located in a generally helical path therealong, and a channel extending outside the wall of said first chamber and leading to the input end thereof, the air flowing through said orifices moving in a counterclockwise direction in said first chamber.
  • a supplementary air supply arrangement to provide additional air for combustion in said first chamber, said arrangement including a plurality of orifices through the wall of said first chamber and located in a generally helical path therealong, and a channel extending outside the wall of said first chamber and leading to the input end thereof, the air flowing through said orifices moving in a counterclockwise direction in said first chamber.
  • said burner further includes a supplementary air supply arrangement to provide additional air for combustion in said first chamber, said arrangement including a plurality of orifices through the wall of said first chamber and located in a generally helical path therealong, and a channel extending outside the wall of said first chamber and leading to the input end thereof, the air flowing through said orifices moving in a counterclockwise direction in said first chamber; and wherein said deflector apparatus includes first and second conical sections at its forward and rearward ends, respectively, the base of said rearward conical section including structure to smoothly divert said air-suspended wood fuel radially outwardly toward the walls of said first chamber; and wherein said deflector apparatus further includes a deflector ring whose inside surfact is angled to deflect any air-suspended wood fuel coming into contact with it toward said rearward conical section.
  • said separator includes a box that is coupled through an opening therein to the apex of said conical section, said separator further including structural means to cause the entering hot gases to flow around and up along said conical section in a counterclockwise direction and at an ever-increasing speed, through said louvres and down into the hollow of said conical section to produce a centrifuge action therein that separates out incombustible ingredients mixed with the hot gases, said ingredients falling through the apex of said conical section into said box.
  • said separator includes a box that is coupled through an opening therein to the apex of said conical section, said separator further including structural means to cause the entering hot gases to flow around and up along said conical section in a counterclockwise direction and at an ever-increasing speed, through said louvres and down into the hollow of said conical section to produce a centrifuge action therein that separates out incombustible ingredients mexed with the hot gases, said ingredients falling through the apex of said conical section into said box.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Incineration Of Waste (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Drying Of Solid Materials (AREA)
US00412474A 1973-11-02 1973-11-02 Wood waste burner system Expired - Lifetime US3831535A (en)

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Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51148854A (en) * 1975-06-13 1976-12-21 Uroko Seisakusho Co Ltd Temperature control method of hot air circulation type plai n board dryer having hot air generator by burning wood powder
US4184436A (en) * 1975-08-14 1980-01-22 Roland Palm Chip-firing unit
US4233914A (en) * 1978-10-02 1980-11-18 Wellons, Inc. Pressurized waste wood furnace system
US4235174A (en) * 1978-11-24 1980-11-25 Weyerhaeuser Company Heat recovery from wet wood waste
US4237780A (en) * 1979-01-30 1980-12-09 Andrew Truhan Hydrocarbon fume disposal system particularly for use in paint spray booths
FR2472139A1 (fr) * 1979-12-19 1981-06-26 Vernon Generateur de gaz chauds et son utilisation pour fournir des calories a un appareil utilisateur tel que four, sechoir, chaudiere
US4326382A (en) * 1980-10-24 1982-04-27 E. H. Robbins Power plant
US4377115A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Furnace for burning particulate wood waste material
US4377117A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Particulate waste wood firing system
WO1983003636A1 (en) * 1982-04-16 1983-10-27 Baardson, Andrew, B. Power plant
US4428308A (en) 1981-11-30 1984-01-31 Georgia Tech Research Institute Linear down-draft biomass gasifier
US4512267A (en) * 1984-01-24 1985-04-23 John Zink Company Methods and apparatus for combusting ash producing solids
US4532873A (en) * 1982-05-12 1985-08-06 Weyerhaeuser Company Suspension firing of hog fuel, other biomass or peat
US4566393A (en) * 1984-02-15 1986-01-28 Connell Ralph M Wood-waste burner system
US4580504A (en) * 1982-03-04 1986-04-08 Phillips Petroleum Company Method and apparatus for the recovery of hydrocarbons
US4589357A (en) * 1985-08-22 1986-05-20 Weyerhaeuser Company Method for reducing comminution energy of a biomass fuel
US4589356A (en) * 1985-08-22 1986-05-20 Weyerhaeuser Company Energy recovery from biomass using fuel having a bimodal size distribution
US4612865A (en) * 1984-07-26 1986-09-23 Rippelton N.V. Apparatus for the combustion of solid fuels
WO1987000604A1 (en) * 1985-07-18 1987-01-29 Weyerhaeuser Company Suspension firing of hog fuel, other biomass or peat
US5086715A (en) * 1989-06-29 1992-02-11 W&E Umwelttechnik Ag Process for incinerating heterogeneous combustible material
US5199363A (en) * 1989-09-21 1993-04-06 Phoenix Environmental, Ltd. Method and apparatus for making solid waste material environmentally safe using heat
US5481063A (en) * 1989-05-18 1996-01-02 A. Ahlstrom Corporation Treatment of process gases containing halogenous compounds
US5609113A (en) * 1994-09-27 1997-03-11 Fiber Fuel International, Inc. Particulate waste wood fuel, method for making particulate waste wood fuel, and a method for producing energy with particulate waste wood fuel
US5926968A (en) * 1996-11-12 1999-07-27 Georgia-Pacific Corporation Wood drying system
US6055915A (en) * 1997-04-04 2000-05-02 Bickell; Roy A. Wood residue disposal system
US6269755B1 (en) 1998-08-03 2001-08-07 Independent Stave Company, Inc. Burners with high turndown ratio
US20090199747A1 (en) * 2008-02-08 2009-08-13 Wood-Mizer Products, Inc. Biomass burner system
US20110126744A1 (en) * 2009-05-22 2011-06-02 Jincong Xu Explosive Combustion Device for Biological Materials
EP2479493A1 (fr) * 2011-01-21 2012-07-25 Exploitation Energetique de Sous Produits Industriels et Agricoles - Exedia Dispositif de combustion, unité d'incinération comprenant un tel dispositif de combustion, et procédé de mise en oeuvre d'un tel dispositif de combustion
US20120216417A1 (en) * 2009-10-23 2012-08-30 Truking Technology Limited Over Device of Tunnel-Type Sterilization Dryer
EP2375152A3 (de) * 2010-04-09 2014-04-09 Fritz Egger GmbH & Co. OG Vorrichtung und Verfahren zur Heißgaserzeugung mit integrierter Erhitzung eines Wärmeträgermediums
EP2929244A4 (en) * 2012-12-10 2016-11-02 Zilkha Biomass Power I Llc COMBUSTION ARRANGEMENT AND METHOD OF USE THEREOF
CN106705105A (zh) * 2017-01-20 2017-05-24 深圳华云环保科技发展有限公司 一种垃圾处理余热回收利用系统及方法
WO2018149651A1 (en) * 2017-02-17 2018-08-23 General Electric Technology Gmbh System and method for firing a biofuel

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5353034A (en) * 1976-10-23 1978-05-15 Mitsuo Kaneko Sawwdust combustion device
JPS58142512U (ja) * 1983-02-09 1983-09-26 菅谷　豊 鋸屑燃焼装置
JPS6149915A (ja) * 1984-08-16 1986-03-12 Showa Senpu Kk 粉粒状固体燃料用バ−ナ−装置
DE69027676T2 (de) * 1989-04-12 1996-11-21 Custom Engineering Materials Inc., Oceanside, Calif. Verbrennungsofen für komplette oxydierung der unreinheiten in einem gasstrom

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US3022753A (en) * 1955-01-11 1962-02-27 Jacksonville Blow Pipe Company Incinerator
US3064592A (en) * 1958-05-07 1962-11-20 Bauer Bros Co Bark processing
US3310009A (en) * 1964-03-05 1967-03-21 John H Jacobs Incinerator for refuse material
US3387574A (en) * 1966-11-14 1968-06-11 Combustion Eng System for pneumatically transporting high-moisture fuels such as bagasse and bark and an included furnace for drying and burning those fuels in suspension under high turbulence
US3675600A (en) * 1971-01-21 1972-07-11 Michel Lumber Co Recirculating dryer system

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Publication number Priority date Publication date Assignee Title
US2614513A (en) * 1950-03-28 1952-10-21 Hofft Company Inc Method of and vortex-type furnace for burning waste fuel
US3022753A (en) * 1955-01-11 1962-02-27 Jacksonville Blow Pipe Company Incinerator
US3064592A (en) * 1958-05-07 1962-11-20 Bauer Bros Co Bark processing
US3310009A (en) * 1964-03-05 1967-03-21 John H Jacobs Incinerator for refuse material
US3387574A (en) * 1966-11-14 1968-06-11 Combustion Eng System for pneumatically transporting high-moisture fuels such as bagasse and bark and an included furnace for drying and burning those fuels in suspension under high turbulence
US3675600A (en) * 1971-01-21 1972-07-11 Michel Lumber Co Recirculating dryer system

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51148854A (en) * 1975-06-13 1976-12-21 Uroko Seisakusho Co Ltd Temperature control method of hot air circulation type plai n board dryer having hot air generator by burning wood powder
US4184436A (en) * 1975-08-14 1980-01-22 Roland Palm Chip-firing unit
US4233914A (en) * 1978-10-02 1980-11-18 Wellons, Inc. Pressurized waste wood furnace system
US4235174A (en) * 1978-11-24 1980-11-25 Weyerhaeuser Company Heat recovery from wet wood waste
US4237780A (en) * 1979-01-30 1980-12-09 Andrew Truhan Hydrocarbon fume disposal system particularly for use in paint spray booths
FR2472139A1 (fr) * 1979-12-19 1981-06-26 Vernon Generateur de gaz chauds et son utilisation pour fournir des calories a un appareil utilisateur tel que four, sechoir, chaudiere
US4377117A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Particulate waste wood firing system
US4377115A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Furnace for burning particulate wood waste material
US4326382A (en) * 1980-10-24 1982-04-27 E. H. Robbins Power plant
US4428308A (en) 1981-11-30 1984-01-31 Georgia Tech Research Institute Linear down-draft biomass gasifier
US4580504A (en) * 1982-03-04 1986-04-08 Phillips Petroleum Company Method and apparatus for the recovery of hydrocarbons
WO1983003636A1 (en) * 1982-04-16 1983-10-27 Baardson, Andrew, B. Power plant
US4532873A (en) * 1982-05-12 1985-08-06 Weyerhaeuser Company Suspension firing of hog fuel, other biomass or peat
US4512267A (en) * 1984-01-24 1985-04-23 John Zink Company Methods and apparatus for combusting ash producing solids
US4566393A (en) * 1984-02-15 1986-01-28 Connell Ralph M Wood-waste burner system
US4612865A (en) * 1984-07-26 1986-09-23 Rippelton N.V. Apparatus for the combustion of solid fuels
WO1987000604A1 (en) * 1985-07-18 1987-01-29 Weyerhaeuser Company Suspension firing of hog fuel, other biomass or peat
US4589356A (en) * 1985-08-22 1986-05-20 Weyerhaeuser Company Energy recovery from biomass using fuel having a bimodal size distribution
US4589357A (en) * 1985-08-22 1986-05-20 Weyerhaeuser Company Method for reducing comminution energy of a biomass fuel
US5481063A (en) * 1989-05-18 1996-01-02 A. Ahlstrom Corporation Treatment of process gases containing halogenous compounds
US5086715A (en) * 1989-06-29 1992-02-11 W&E Umwelttechnik Ag Process for incinerating heterogeneous combustible material
US5199363A (en) * 1989-09-21 1993-04-06 Phoenix Environmental, Ltd. Method and apparatus for making solid waste material environmentally safe using heat
US5609113A (en) * 1994-09-27 1997-03-11 Fiber Fuel International, Inc. Particulate waste wood fuel, method for making particulate waste wood fuel, and a method for producing energy with particulate waste wood fuel
US6193768B1 (en) 1994-09-27 2001-02-27 Mcx Environmental Energy Corp. Particulate waste wood fuel, method for making particulate waste wood fuel, and a method for producing energy with particulate waste wood fuel
US5926968A (en) * 1996-11-12 1999-07-27 Georgia-Pacific Corporation Wood drying system
US6055915A (en) * 1997-04-04 2000-05-02 Bickell; Roy A. Wood residue disposal system
US6269755B1 (en) 1998-08-03 2001-08-07 Independent Stave Company, Inc. Burners with high turndown ratio
US20090199747A1 (en) * 2008-02-08 2009-08-13 Wood-Mizer Products, Inc. Biomass burner system
US20110126744A1 (en) * 2009-05-22 2011-06-02 Jincong Xu Explosive Combustion Device for Biological Materials
US20120216417A1 (en) * 2009-10-23 2012-08-30 Truking Technology Limited Over Device of Tunnel-Type Sterilization Dryer
US8726533B2 (en) * 2009-10-23 2014-05-20 Truking Technology Limited Over device of tunnel-type sterilization dryer
EP2375152A3 (de) * 2010-04-09 2014-04-09 Fritz Egger GmbH & Co. OG Vorrichtung und Verfahren zur Heißgaserzeugung mit integrierter Erhitzung eines Wärmeträgermediums
EP2479493A1 (fr) * 2011-01-21 2012-07-25 Exploitation Energetique de Sous Produits Industriels et Agricoles - Exedia Dispositif de combustion, unité d'incinération comprenant un tel dispositif de combustion, et procédé de mise en oeuvre d'un tel dispositif de combustion
FR2970764A1 (fr) * 2011-01-21 2012-07-27 Expl Energetique De Sous Produits Ind Et Agricoles Exedia Dispositif de combustion, unite d'incineration comprenant un tel dispositif de combustion, et procede de mise en oeuvre d'un tel dispositif de combustion
EP2929244A4 (en) * 2012-12-10 2016-11-02 Zilkha Biomass Power I Llc COMBUSTION ARRANGEMENT AND METHOD OF USE THEREOF
CN106705105A (zh) * 2017-01-20 2017-05-24 深圳华云环保科技发展有限公司 一种垃圾处理余热回收利用系统及方法
WO2018149651A1 (en) * 2017-02-17 2018-08-23 General Electric Technology Gmbh System and method for firing a biofuel

Also Published As

Publication number Publication date
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