DE1950527A1 - Method and installation for the treatment of particulate matter on a moving carrier - Google Patents

Description

- "Patent Attorneys

Dr. Ing.Walter Abitz
Dr. Dieter F. Morf
Dr. Hans-Α. Browns

Munich co, Pienzenauerstr. 28

October 7, 1969 DS - 55653

ARTHUR G. MC KEE & COMPANY
23ΟΟ Chester Avenue / Cleveland, Ohio, V.St.A.

Process and system for the treatment of particulate! Good on a moving carrier

The invention relates to a method and a system for treatment of particulate! Good on a moving support and especially the handling of particulate! Good on a moving support in such a way that treatment gases passed through a bed of the goods on the carrier and through the carrier in several passages will.

Although the invention applies to various types of treatment plants and in connection with the treatment of various Kinds of particulate! Can be applied well, will

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it is primarily related to treatment a horizontal moving grate of particulate! - agglomerated exsenoxide material for the formation of thermoset pellets described, which have sufficient strength • and have hardness so that they can be handled, shipped, stored and can be fed into a blast furnace or other smelting plant.

In the production of such heat-hardened iron oxide pellets finely divided iron oxide or enriched ore

fc concentrate, fly ash or other ferrous material either alone or particles of solid fuel, fluxes or other substances mixed together with water, whereby a moist muddy mass is obtained, which then to green balls by suitable means known per se is shaped. If the balls, as is usual, 'so far are essentially spherical as possible, they are of a uniform desired size, usually with one Diameters from about 6.4 mm to about 25 mm (about 1/4 "to about 1 ") and preferably of a diameter between about 9.5 mm and about 12.7 mm (about 3/8 "and about 1/2">. 'that Pelleting requires heating these spheres under temperature and other conditions to dry and close them

* harden so that they can then be handled, shipped, can be stored and loaded into reduction furnaces by conventional means. Horizontal traveling grate pelletizing systems have found extensive use in pelletizing the green spheres to obtain thermoset pellets. " Other systems for forming pellets under pressure with or without water are also known and widely used.

The horizontal grate systems that have hitherto been built usually have a straight grate. Recently, it has been proposed to use pelletizing systems in which the grate is in a

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essentially circular horizontal path runs.

Both with straight and circular pelleting systems a moving, gas-permeable grate is provided, which transports the particulate material from a loading point from through several treatment zones to a discharge point. There are above and below the grate Gas compartments that serve to pass the gases through a bed of particulate matter on the grate and through the grate to convey the desired treatments, such as drying, heat-hardening and cooling, to the goods. With horizontal grate systems must have adequate seals between the moving grate and the gas spaces above and below of the grate can be provided in order to prevent undesired leakage of gas from or into the gas spaces. It is difficult to provide satisfactory seals in these locations, especially when there are significant pressure differentials exist. Furthermore, it was necessary to get the desired large volume of gas through the various treatment zones along the grate for the production of large volumes move, necessary to use large fans that usually must be made of heat-resistant materials so that they can withstand the high gas temperatures can. Such fans are expensive, require considerable power to operate, and are subject to heavy wear and tear and result in high maintenance costs.

If hot gases are taken from a zone on a grate for economic use of heat, diverted from the pelletizing plant and then fed back into another zone after passing through a fan, as is customary, great lengths of expensive pipeline routes had to be built up to now. which must be heat-resistant and adequately thermally insulated "in order to reduce heat losses to an acceptable minimum. The device for

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Expansion in these major pipelines is both expensive as well as by "the practical size of the machine that was built can be limited. . ·

With the help of the method and the plant according to the invention can avoid all of the above and other disadvantages will. In the method and the system according to the invention, treatment gas, for example air, flows through the grate a horizontal grate system four times or an even larger one even number of times. Therefore occurs with a current

ψ . quadruple pass, which is preferable, the gas down through the bed of particulate! .. well and through the grate in a first down draft cooling zone, then up through the grate and bed on top of it in a second up draft cooling zone, back down through the '.. grate in a downward pull hardening zone and then up through the grate in an upward pull drying zone, whereupon it can be directed to exhaust vents. It is therefore possible to provide on one side of the grate, preferably on the upper side, all the higher gas pressures that move the gas through the grate and the bed of material on it. As a result, it is possible to use seals that prevent the leakage

^ Prevent gases under higher pressure, only

to be provided on one side, for example on the top of the grate.

Therefore, if, for example, the system is a circular grate system which is designed so that the higher gas pressure prevails at the top of the grate, liquid seals, which are more likely to withstand higher gas pressures with the least possible leakage, only need to be provided against the top of the grate to seal the gas enclosures above the grate. Mechanical seals can then be used to seal the underside of the grate against the gas inclusions underneath it.

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It is also possible to have long ducts with insulation or are equipped in another way and so far for the transport of hot gases from one treatment zone to one others were required to be avoided largely, if not at all, as essentially all gases were to and through the heating tongues can get along the grate by passing through the enclosures above and below of the grate.

The invention therefore reduces the aforementioned sealing problems and enables the length of the outer lines to be reduced and the number of fans required to move the gas, and results in lower cost and one more effective investment.

The foregoing and other features of the invention result the aforementioned and other advantages are particularly effective in circular grate pelletizing plants, so that the invention follows in connection with such an installation is described, although the features of the invention are also advantageous can be used for systems with straight grates.

The foregoing and other advantages and features of the invention emerge from the following description of several preferred embodiments of the invention in FIG Connection with the accompanying drawings, namely show:

Fig. 1 is a perspective view of an embodiment a circular grate pelletizing system according to the invention;

FIG. 2 is a plan view of the system shown in FIG. 1 in FIG a somewhat schematic representation} '

Fig * 3 shows a schematic view of the grate of the plant, 'stretched in the state _i from which the grate, the on · fchlieefungen above and below the grate and

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the course of the gas flow in the system according to FIGS. 1 and 2 can be seen;

FIG. 4 shows a further schematic representation of the grate in FIG elongated form, which typical temperatures and Volume flow rates of the gas flow in different zones along the grate in the system according to FIG. 1 - represents 3, the numbers referring to the flow rates under normal conditions for Relate temperature and pressure;

Fig. 5 is a sectional view taken along line 5-5 in Fig. 2; Fig. 6 is a sectional view taken along line 6-6 in Fig. 2;

7 is a view on an enlarged scale of the lower one Part of Fig. 6 which seals the grate against the enclosures above and below the grate shows to prevent gas passage; '

8 shows an individual illustration on an enlarged scale an embodiment of the seal between the lower part of the grate and the gas containment below the grate can be used;

Fig. 9 is a plan view of parts of the grate and the adjacent system, from which in particular the ball feed and the pellet discharge points are visible on the grate;

10 is a side view in a somewhat schematic representation of the emptying text of the grate shown in FIG System that shows how the middle sections of the grate are emptied, where-

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in Fig. 10 corresponds essentially to the line 10-10 in Fig. 9;

11 shows an individual illustration of one of the seals below of the grate;

Figure 12 is a view taken on line 12-12 in Figure 11;

13 shows an individual representation in section of one of the transverse seals above the grate between two zones of the hood enclosure above the grate;

FIG. 1H is a view taken along line 14-IM in FIG. 13;

Fig. 15 'is a view in section across the grate of the sealing means at the point where the grate merges into the dryer hood;

Fig. 16 is a view of the seal shown in Fig. 15 means along line 16-16 in Figure 15;

17 is a sectional view along the direction of travel of the grate from the seal between the bed of hot pellets on the grate and the end of the cooling hood where the pellets leave the cooling hood, and

Fig. 18 is a sectional view of a further embodiment of the invention, in which the seals above and below the grate are in both cases Liquid seals are involved, FIG. 18 otherwise being similar to FIG. 7.

The system shown in Fig. 1.-18 (Fig. 1, 2 and 9) loading;

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sits a grate 1, which is circular in plan view and for revolving around a vertical axis A in a circular path in the direction indicated by the arrows is built. The grate 1 has a gas-permeable hearth 2 with standing, gas-impermeable side walls 3 and 4. The side walls 3 and 4 extend fully around the outer circumference and the inner circumference of the grate and form with it the stove a grate of a substantially U-shaped Cross-section. '■

The grate is supported by a rigid frame 5, which is rotatable about the axis A and has an element 6, which around the outer circumference of the system adjacent to the outer one Side walls 3 of the grate extends, and an element 7 that extends around the inner circumference of the plant adjacent to the inner Side wall 4 of the grate extends. The lower part of the Element 6 carries a circular rail 8, which runs on rotatable rollers 9 and is supported by these, which rollers are mounted in supports 11 which are spaced around are provided around the outer circumference of the system. The lower part of the element 7 supports a circular rail 12 which. runs on rollers 13, which are mounted on supports IU, which are arranged at intervals around the inner circumference of the system are. At least some of the outer rollers 9 are driven by shafts 15 via reduction gears 16 of motors 17 from (Fig. 1 and 6) driven.

The supports 11 and 14 are arranged on horizontal supports 18 of a stationary support frame 19 which has vertical uprights 21 and 22. Suitable green balls B, for example of the aforementioned type, are placed on the grate by a loading device 23 (FIGS. 1 and 9) at a loading point C, which balls are placed on the grate around the circumference of the system in the direction indicated by the arrows in Fig. 1 and in other · figures indicated direction around to a discharge

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place D wander, which is closely adjacent to loading station C. and to this upstream side is on which Discharge point the obtained pellets from the grate through below means described in more detail carried out x «; earth.

Stationary hoods 24, 25 and 26 (FIGS. 1 and 2) are carried by the stationary frame 19 above the grate 1, by an intermediate part 27 between the hoods 24 and 2 5 and an intermediate part 28 between the hoods 2 5 and 26 are connected to each other. Seals 29 and 30, described in more detail below, are attached to these intermediate hood parts CFig. 3) provided which separate the interior of adjacent hoods so that little, if any, gas above the Layer of pellets from one hood can get into an adjacent hood. A conventional seal 20 is on Entrance end of the hood 24 arranged to allow passage of gas above the layer of green spheres that are in to prevent the hood from entering, and one below described seal 3 3 is arranged at the outlet end of the hood 26 to exclude a gas passage above the bed Prevent pellets from leaving the hood.

A stationary V7indkasteri 32 extends immediately unter.den the grate over that part of the circumference of the system which is covered by the hoods and is closed at its ends 34 and 35 and further by partition walls 36, 37 and 38 with associated seals 39, HO and ¹ H, which will be described in more detail below, is divided in the wind box sections 42, 43, 44 and 45th The above-mentioned partition walls and seals prevent significant amounts of gas from directly below the grate from flowing out of a section of the junction box 32! The partitions 36 and 38 and the associated seals 39 and 41 are located essentially below the seals 2 9 and 30 * The seals and partitions below the grids with the

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Seals 2 9 and 30 above the grate subdivide the Hood and wind box parts of the system, between which the grate runs, in different treatment zones.

The hood 24 and the wind box section 4-2 associated therewith form a drying zone 46 in which the green balls are subjected to drying and preheating by hot gases which, with an upward pull, pass through the layer of balls on the grate while this be conveyed through the mentioned zone by the moving circular grate. The part '25a of the hood 25, which extends between the seal 29 and the intermediate part 27 to the wind box partition 37 and the seal 40 assigned to this over the assigned wind box section 43L, form a hardening zone 47 in which the preheated and predried green balls exposed to high temperatures in order to harden them or to subject them to heat hardening by oxide conversions, recrystallizations and grain growth in a manner known per se by the hot gases, which pass with a downward pull through the layer of balls on the grate when the latter migrates through zone 47. The hood section 2 5b, which forms the rest of the hood 25, and the associated wind box section 44 delimit a zone 48 in which the * heissen.hitzegehärteten pellets are pre-cooled by the passage of an upward draft of air through the layer of hot pellets on the through the Zone to be subjected to migrating rust. The hood portion 26 and the associated wind box portion 45 forming a final cooling zone _49} through which the pellets are conveyed through the traveling grate and from which they are discharged below the seal 33 '. ·.

As can be seen from Fi ^. 7 results., The wind box sections each from a metal jacket ": 51 and from an inner, hitsebe-

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permanent heat insulating refractory lining 52 educated. At points located at a distance from one another, the wind box is similarly designed to follow downwardly extending parts 53 for collecting dust from the gases and discharging the same through a shutter 51 into a channel 55, from which it is removed by a water stream can be provided.

The dome parts 24 and 26 have those shown in FIG Cross-sectional shape. Each has an outer metal jacket, which is lined with a heat-resistant, heat-insulating refractory material in the usual way and on, Support frame 19 is suspended. The lower edges of the hood side walls are the upper edges of the side walls of the grate 1 close together.

The cross-sectional shape of the hood part 25 is shown in FIG. 6. The hood part 25 has side walls 56, the The lower edges are closely adjacent to the upper edges of the grate side walls. The hood itself has an outer metal jacket 60 and is lined with a layer of heat-insulating, heat-resistant refractory material 57. The hood is carried by the frame 19.

Each side of the hood part 2 5 is provided with a plurality of burners 58 provided, for example with gas or oil burners through conventional means not shown with fuel will. Each of these burners is also supplied with primary combustion air through a branch line 59 which is connected to one of the lines 61 and 62 are in communication, which are connected to the cooling zone 49 via a line 31. These lines are preferably insulated in order to carry the heat of the hot air emerging from the mentioned zone Preserve, if desired, can also be tempering or

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Cooling air of ambient temperatures can be introduced into each conduit 61 and 62 through a transverse duct 50 which passes through a valve 70 shown in Figs. 2 and 3 is controlled.

1, 2, 3 and 4 show the means for handling the gases and the course of the gas flow into the system of FIGS. 1-18. Ambient air is initially passed into the system and into the system on the hood 26 of the cooling zone 49 a line 63 is introduced by means of a conventional blower 64 and a substantial superatmospheric pressure of the air in the hood 26 of, for example, about 508 mm (about 20 ") of water is maintained at normal conditions. The air passes down through the layer of hot pellets on the grate through, as well as through the grate into the wind box section 45, which is maintained at a lower but substantial superatmospheric pressure of, for example, about 127-254 mm (about 5-10 ") water column at normal conditions. From the section 45, the heated air takes, for example, a temperature between about 100 ⁰ C and about 500 ⁰ C laterally under or through the partition 38 into the wind box section 44 and then up through the grate and the bed of hot pellets on the grate the zone 48 in the hood part 2 5b, in which it preferably has a slightly above atmospheric pressure. ' This heated air makes its way laterally from the hood part 2 5b to the hood part 2 5a, in which it is preferably at about atmospheric pressure, and then down through the bed of green balls on the grate, which are thermoset into pellets by additional heat, which through the burner 58 is fed into the hardening zone 47.

In the zone 47 the heated gas increases above the grate, which also contains the combustion products and temperatures between about 1100 ° C and 1400 ⁰ C, has its way down through the balls on the grate, the lower heat curing

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into the wind box section 43, from which you take your VJeg laterally under or through the partition wall 36 in the VJindkastenabschnitt 4 · 2 and then up through the grate and the green balls on the grate in the drying zone 46 in the hood 24. The hood suction fan 65 contributes to the removal of the cooled gases and, for example, to a vent or chimney. A sub-atmospheric pressure of about −254 mm (about −10 ") of water under normal conditions and a gas temperature of about 80 ^° C. to 400 ^° C. and preferably about 150 ° C. can be maintained in the hood 24.

Fuel mixed with primary combustion air at a suitable temperature and supplied in the manner indicated above is conventionally burned in the burners 58 in secondary combustion air, that is, in the air passed through the grate and bed of pellets in zone 48 is supplied to the desired curing temperatures between 1100 ⁰ C to obtain und.1400 ⁰ C in the zone 47th As the gas passes from these temperatures down through the layer of balls on the grate in zone 47, it causes oxide conversions, recrystallization and grain growth surrounding the thermoset pellets, thereby obtaining pellets of the desired hardness and other properties . From the gas flow profile shown, only two fans 6 4 and 6 5 are required to achieve the gas flows described above through the system and the fourfold passage through the grate and the bed of balls or pellets on this. The highest superatmospheric pressure prevails in the cooling hood 26, into which ambient air is conveyed by the fan G4. The superatmospheric pressure in the direction of the gas flow becomes progressively lower and can even become a subatmospheric pressure in the drying hood 24.

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In addition, the gas flows in the opposite direction to the conveying direction of the green balls and the pellets obtained on the grate.

The ambient air introduced into the system shown initially comes into contact with the hot pellets and is heated, whereupon the heated gas has its V / Urme upstream side the trajectories of the green balls and pellets, where part of the gas is used for cooling, a part for "supplying heated secondary combustion air and a part for hardening the green balls.

Since in the system shown in Fig. 1-18, the maximum pressure is above the grate, it is possible to remove the seals, which provide higher gas pressure resistance, only above half of the grate. In such a system are therefore Viassereals 68 and 69 (Fig. 6, 7 and 8) on the Sides of the grate provided to prevent gases from leaking in to prevent the and from the joints of the grate and the hoods above the grate. Mechanical seals 71 and 72 are provided on the sides of the grate to prevent gases from leaking into and out of the connecting tunnels of the i.ostes and the VJindkasten sections below the roster, to prevent. ·

The viasner seals, which are intended to prevent the passage of gases between the grate and the hoods, have ring-shaped rotatable troughs 73 and 7H (FIG. 7) with a channel-shaped quo.rsc initt, which are gas-tight immediately adjacent to the outer wall or inner wall 3 and H, respectively the. 'lot; gate. are arranged and by the framework elonontp fi and 7 de :; rotating frame Γ>. been worn, of · den: '. r>_; : t tr-l'it. Dia :; '"» Deceit f (your two Viasr.or, which is circulated by- * ·, -'<·!'U.-tt · "it to I, to e. Ln nledrjn du» Ίι ;.; i'vs to prevent. Abi-.chirnungnv.vindo 7Γ> and 7C> p.rr.Lroekc.n: i i'.ii ··.-di.cht from the Un tr.rk-in ton te Lien dor So.item /. "Iuk» -Λον Ilaubop.

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into the water in the troughs. Preferably these walls extend continuously over the full length of all hoods from the beginning of the drying section to the end of the cooling section and are preferably at the ends of the hoods connected with transversely arranged conductor elements, which have a Gas escapes past the ends of the hoods over the water surface impede. The walls are preferably made with cross elements 77 provided in order to prevent sedimentation of sediment, which is deposited in removable channels or trays 78 end to an easy removal of deposited sediment to enable. Therefore, when the grate 1 rotates around its axis A, the troughs 73 and 74 move with it, while the walls 75 and 76 remain stationary and, in that they extend into the water, the joints of the grates and hoods effectively seal against the escape of hot gases despite a considerable superatmospheric gas pressure in the hood.

The mechanical seals 71 and 72 which serve to hold the grate against the window box sections below the grate are appropriate for the lower gas pressures that exist below the east. The in Fig. "7 and 8 The seals illustrated are of the type described in U.S. Patent 2,789,809 and the mechanical illustrated Seal is a sliding element 81, which in plan view is arcuate, attached to the upper part of each side of the wind box 32 by a fixed bracket 80 and extends the length of the wind box 32 on each side of the grate. Sealing strips 82, each of which is a Segment of an arc of a circle of suitable diameter are supported by bolts 83 extending in the circumferential direction are spaced from each other and are arranged in links 84 which are directed downward on the lower Share dor associated side wall 3 or M of the grate

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fearful fiends _; ielmissenzen on the Gleitelemen.t ^r 8> l ·. ^r liaben; '; ν: ϊ ·.'; ■ '· ■ / .. The lower "Di; öh ^ un ^ ppivl ^ e ^";^' ^: 'v-: gß -iri. Hpri Dt nhtnnp'R lf> i ste 8 $ i'st to-'Auf -lauf'e -and-.iSü.'öiLtb'le, · * - ¹ -; - "movement.

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Bar parts 95 on

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? Refractory material that is attached to a load-bearing structure which, as recited, can form a wall of one of the troughs 7 3 or 7 H attached to the cream.

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elements 6 and 7 are attached. The sidebar parts 95 and the emptying parts 94 of the cooker 2 are water-cooled tubular and rotatable shafts 99 as well as through water-cooled pipes 101 stored, which lead to the rotatable Frame 5 are stationary. Both the shaft and the tube are supported by the frame elements 6 and 7 of the frame 5 namely the former through camp 102. -

The side ledge portions 95 form (Figs. 7 and 18) one another spaced bar elements 103, the spacing of which is dimensioned in a manner known per se so that adequate gas permeation can take place, but these are arranged sufficiently closely adjacent to one another to prevent green balls or green pellets from falling through. Similarly, the emptying files 94 each (like Fig. 7 shows) formed by spaced bar elements 104, which the green balls or green pellets and have a sufficient distance from each other in a manner known per se so that an appropriate one Gas can pass between them, but are arranged sufficiently close to one another to prevent the To prevent bullets or pellets. Each drainage part 94 is rigidly attached to a rotatable shaft 99 and can, as shown in Fig. 10, inclined by a partial rotation of the shaft will. Each emptying part can also be brought to rest on one of the tubes 101, which is referred to on the rotatable frame 5 is stationary.

Each shaft 99 is given a partial opening for emptying the pellets by an arm 105 (Fig. G, 7th, 10 and IP) which is rigidly stretched on one end of the shaft 99 and a roller 106 at its other end. ^; gt., which engages in a guide 107 and moves in this, .welche-, on dom stationary frame. 19 adjacent to the discharge parts D of the Rostas yef eu '. i ■ ', L

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is. The guide 107 is shaped so that the wandering Frame 94 rotates and arms 105 take with it. The arms 105 successively engage the guide 107, so that the shafts 9 9 assigned to them perform a partial rotation un their axes and successively the movable .. Hearth parts 94 incline, so that the pellets on the parts 94 are emptied into a discharge chute 108, the under the full length and breadth over which it extends the hearth parts 94 tilt, extend and direct the pellets to a conveyor 109 (Fig. 1). Preferably lean like As shown in Figure 10, the parts 94 of the range are away from their direction of travel so that their pellet bearing tops are directed opposite to the direction of movement. This inverse inclination of the parts 9 4 as well as the position and extent the chute 108 ensure that everyone is at the discharge point D discharged pellets get into the chute 108.

The water cooling system for each of the shafts 99 and each Pipe 101 becomes air: best understandable in connection with FIGS. 6 and 18, in which only shaft 99 is shown. A trough 111 is provided which is separate from the trough 73 and from the frame element 6 on the outside of the rotatable frame 5 is worn. This trough 111 extends fully around the system and is filled with water through not shown appropriate conventional means supplied and kept filled. A hose 112 connects the lower part of this Trough with the inside "of the rotatable shaft 99 outside of the associated bearing 102. Another hose 113 is connected to the outer end of the shaft 99 and leads to the lower trough 152. The water therefore flows out of the trough 111 via the hose 112 to the shaft 9 by the effect of the gradient and through this and via hose 113 to lower trough 152. The water cooling system for each does not rotatable tube 101 is similar.

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As Figs. 11 and 12 show in which one, the gas collector wind box seals 40, a plate is disposed on the partition wall 37 which forms the wind box section 4 3 separates from the wind box section 4 4. The plate 114, which has an upper part 114a made of refractory material which is supported by a lower part -1.14b made of heat-resistant metal, is arranged under the traveling grate 1 and extends completely over the wind box 32 and is attached to its sides in a gas-tight manner, as shown in FIG. The leading edge 115 and the trailing edge

116 of the seal 40 are inclined downward. Each of the rotatable shafts 99 is enclosed in a protective cast housing worn and each of the tubes 101 is covered with a protective Cast housing 118 provided which cast housings completely surround the shafts 9 9 and the tubes 101. On every cast housing

117 and 118, a sealing wing 119 is attached extending downwardly therefrom. The wing 119 is flexible and carries a flange 191 at its end remote from the cast housings 117 and 118. The flange is due to it Flexibility in a gas-tight system strains and slides over the top of the plate 114. The sealing wings 119 extend extends substantially entirely over plate 114. Only one seal 40 has been described, but may the seals 39 and 41 as well as the seals under the entry and exit of the grate from the hoods in be designed in a similar manner.

The seal 29 of the system shown on the intermediate part 27 between the hoods 24 and 2 5 is with closer; details shown in FIG. Access to the inside of the hood 25 is formed by a door 123 which is suspended from the frame 19 by supports 124. The carriers 124 are on theirs upper ends of trolleys 12 5 attached to the frame 19-are attached so that the door 12 3 moves laterally

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can be, as shown in Fig. 14, giving access to the interior of the hood 2 5 for inspection or for repair work is obtained. The seal 2 9 is carried by two ■ double-T-beams 12 6, which are attached to the intermediate part 2 7 are attached and are above and completely over the Hearth 2 of the traveling grate 1 of the system extend. The girders 12 6 carry double-T girders 127, which extend in the conveying direction the pellets P on the stove of the grate of this system extend. Guide elements 128 and spacers 129 made of refractory material are suspended from each double T-beam 127 attached. The double T-beams 12 7 and the Leitele- ' elements 128 are provided in their number so sufficient that the guide elements and the spacers are essentially Extend completely over the hearth of the grate 1 from the side wall 3 to the side wall 4, as shown in FIG. The guiding elements therefore form spaced guide surfaces 131, the lower ends of which are the top of the wandering Bed of pellets P are closely spaced so that little or no gas is coming out of the over the top of the pellets Hood 25 to hood 24 exits. There are several rows of Guiding elements 12 8 provided to the direction effect through to help create a tortuous path through which the gases must pass.

The sealing means 30 between the hoods 25 and 26 can the sealing means 29 be identical.

The sealing means 20 of the system shown at the inlet of the grate in the dryer hood 24 are shown in FIGS. 15 and 16 shown. The seal 20 is made up of cross pieces 132 and 133 ^ otrnr; on, which is in a royal manner on the metal jacket the hood 24 are attached. The quor pieces 132 and 133 extend essentially over the grate 1. A number of support rods 134 hang from the cross pieces 132 and 13 3 after below and carry the three π I over-

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. 1350527

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lapping portions 135, 136 and 137 of gasket 20. Each section 135, 136 and 137 is supported by a flat top plate 138 and a number of downwardly hanging wings 139 formed. The. Guide vanes 139 ′ extend from the upper plate 138 to directly above it underneath moving bed B of green balls downwards. The three sections of the seal are designed and arranged so that their guide vanes extend substantially fully over the stove 2 and are further arranged so, ' that a tortuous path is obtained through which the gas or air would have to pass, so that practically the The passage of ambient air into the hood 24 or the escape of hot gases from the hood 24 is prevented.

The seal 33, which seals the outlet end of the hood 26, is shown in FIG. She has a body 140 of rectangular cross-section made of cast refractory Material that is essentially completely over the Grate 1 extends. It is on one of its edges on the outer shell 51 of the hood 26 pivotably mounted by a support 141, so that the outer surface 142 of the body 140 the top of the bed of pellets P emerging from the hood 26 step out, rests. The body 140 therefore seals the Hood 26 against the escape of hot gas to the ambient air and against the entry of ambient air into the hood 2 6 essentially from. The body 140 is preferably made of a plurality of blocks 144 of cast refractory material produced, each of which has one or more bores 145 and which against a support plate 146 through Screws 147 are tightened. The support plate 146 has a U-shaped holder on both of its longitudinal edges 149 140 provided, which extends over the full Lrings of the Body 140 extends. The bracket 140 above the one Edge 'of the plate 146 rests on the support 141, As the Body 140 is pivotally mounted on the support 141 is

^ = ¹¹¹ V 009848/1148 bad

DS - 55653

■ ω

it vertically movable so that its outer edge part 142 always has contact with the top of the bed of pellets P as it emerges from the hood 26. The hard pellets P, which touch the surface 142, can after longer Periods of time wear out the part 142 until the body 140 assumes the position shown in phantom in FIG. When the wear and tear is so advanced that the lower part of the body 140 is no longer effective the desired gas-tight seal can be maintained, the body 140 is removed from the bracket 141 and turned so that the other bracket 148 rests on the support 141 and the upper part of the body 140 then the Touches the top of the pellets P to form the desired seal.

Another arrangement for sealing the sides of the wind box 32 with the grate against the exit or entry of gases is shown in Fig. ' 18 shown. Two stationary troughs 151 and 152 are on the inner and outer one Boundary of the wind box 32 attached in a gas-tight manner. They extend fully around the perimeter of the facility. In each of the troughs 151 and 152, water is drawn up to a suitable one Height held. Downwardly extending shield walls 153 and 154 are gas-tight on the underside of the The upper troughs 73 and 74 are attached and their lower ends are immersed in the water of the associated troughs 151 and 152. The walls 153 and 154 therefore move with the Grate 1. Furthermore, the walls 153 and 154 are provided with cross pieces 155, which a sediment deposit in the troughs 151 and 152 prevent. All changed parts of the plant can be of the type previously described. A plant of the type shown in Fig. 18 is special advantageous when the gas pressures below the grate are considerable.

- 23 -

009946/1146

DS - SS6S3

The method and the system according to the invention enable important and new advantages through an increased thermal efficiency and a more effective and uniform ■ Treatment of particulate! Well on a horizontal Rust »The essentially gas-tight seals with water seals to seal the grate to the hoods above the grate and with mechanical seals for sealing of the grate with the wind box below the grate result in an effective use of the two types of seals and allow easier access to the system for maintenance and other purposes. When the treatment gas with an even number of passages, in particular with four passages, flows through the grate, it is possible the pressure differential that moves the gases in and out of the bed all on one side of the grate, for example at the top of the grate, as in the first embodiment described. It is therefore possible that the high pressure only seals on one side of the grate and only two fans need to be used to move the gases through the system according to the invention. The air flow shown with respect to the pellets on the Bed is in the system shown such that essentially all the air through all zones in counter-current ratio passes through, resulting in high heat recovery efficiency is obtained.

Although the system according to the invention in connection with the Use of migratory. Water troughs has been described, it should be mentioned that water troughs attached to d = n hoods and migrating sealing elements attached to the grate can also be used. In addition, other mechanical Seals can be provided as the continuously sliding seal of the type shown in FIG.

With the help of the system and procedures described, everyone can

^: ■ ^ Mvm ^ ' .- »-. ■■ λ -.; * ■

009845 / 1T4S

Arthur G. McKee & Comp.

The aforementioned advantages are achieved and the deficiencies described above, previous systems and processes are avoided. The invention is of course not limited to the systems and methods described, but can be used within experience various changes to its framework.

Explanation of symbols for FIG. 4; ■

a = b = 1416 in ⁵ / min h = 1246/3 m ^ / min

c = d = 113.3 nrVmin 'i »1019 m ⁵ / min

e = f = g = 56.6 m ^ / min k = 226.5 m ^ / min

1 = 622.6 m ^ / min

m = 169.9 mV

- new page 25 -

Claims (1)

DS - 556 5 3 P at e- η ta η s ρ r vl che: Process for the treatment of particulate! Well on a substantially horizontal gas permeable Traveling grate on which the particulate material is deposited is characterized in that the treatment gases through the material on the grate in each of at least four and an even number of zones lengthways of the grate is directed. 2. The method according to claim 1, characterized in that the number of zones is (4). 3. The method according to claim!, Characterized in that the treatment guests under pressure in the last of the zones initiated and withdrawn from the first zone. M-. Method according to claim 1, characterized in that a pump is only operated in the last zone , the treatment gases through the material on the grate to conduct, and an extraction device only in the first zone to extract the treatment gases. .5. Method according to claim 1, characterized in that the zones through which the material successively passes, through a dry zone, an Ilei ^ zone, > 2.ß - ■■ ^Saö original 0 0S8 4S / 114S 1350527 DS - 55653. . ■ if a pre-cooling zone and a cooling zone are formed v / earth. Method according to claim 5, characterized in that cooling air under pressure in the cooling zone and with a downward pull through the material and the grate in the mentioned zone is passed to the ma-. to cool the material and to warm the air, whereupon it is pulled through the material with an upward pull and the grate in the pre-cooling zone, with one facing down directional pull through the material and the grate in the Heating zone and passed through the material and the grate in the drying zone with an upward pull will. 7. Plant for the treatment of particulate material, marked by a substantially circular traveling grate with a gas-permeable base forming a floor Hearth part and standing side walls, a gas enclosure, which is arranged on one side of the traveling grate is, as well as a gas confinement that is on the other Side of the grate is arranged a continuous trough that contains liquid and from one Side of the grate and the gas enclosure is supported, a shield that extends from the one gas enclosure and from the grate into the mentioned liquid, in order to form a substantially gas-impermeable seal, a sealing element, which the gas confinement surrounds a sealing strip carried by the grate and in sliding contact with the sealing element held: is to a substantially gas-impermeable - 27 - Egg ar * 00984 6/1148 DS - 5.5653 To form a seal. 8. Plant according to claim 7, characterized in that the continuous trough is supported by the grate and the shield extends from the gas containment. 9. Plant according to claim 7, characterized in that the continuous trough is supported by the gas containment and the shield extends from the grate, 10. Plant according to claim 7 _{9 9} characterized in that the Gaseinschiiessung is stationary and the shield, and the seal member on each side of each of Gaseinschliessungen are arranged. 11. Plant according to claim 7, characterizedί that one the gas confinement is arranged above the grate and the trough, x ^ elche gas confinement is stationary is and extends over the grate> the stationary Shield is arranged on each side of the gas enclosure and the mentioned second gas enclosure is formed by pegs, which are placed below the grate are. 12. Plant for the treatment of »particulate! Well »marked through, a gas-permeable ·, essentially circular traveling grate, a device for support DS - 55653 of particulate! Good on the grate, a facility to form an even number of treatment zones which are consecutive on the grid in the direction the grate migration are arranged, a device by which air enters the last of the zones, and means for supplying cooling air to this last Zone under superatmospheric pressure sufficient to allow air to pass through the grate in bring each of the zones. 13. Plant according to claim 12, characterized in that the last-mentioned device by a pumping device is formed, which is operated at a pressure sufficient to allow the air to pass through the mentioned To bring zones without them passing through additional pumping devices. 14. Plant according to claim 12, characterized in that four zones are provided. 15. Plant according to claim IU, characterized ^ indicates that the Treatment zones Drying, heating, pre-cooling and cooling zones are. 16. Anlage.nach claim 12, characterized in that the treatment zones include a gas enclosure above the grate, a gas inlet below of the grate, a continuous liquid containing & 0H4S / 1US DS - 55653 * i Trough that is supported by the grate, a shield that from the gas lock above the grate into the liquid to form an essentially gas-impermeable seal extends, a sealing element, · which the gas confinement below the The grate surrounds, and a sealing strip carried by the grate and in sliding contact with the sealing element is held to form a substantially gas-impermeable seal. 17. Plant according to claim 12, characterized in that Seals are provided above and below the grate between the pre-cooling zone and the cooling zone, to prevent air from passing along the grate. 18. Plant according to claim 17, characterized in that additional seals between the heating zone and the Drying zones are provided above and below the grate. . 19. Plant according to claim 12, characterized in that the air which is under superatmospheric pressure flows in countercurrent to the movement of the goods on the grate 20. Plant for the treatment of particulate! Well, labeled through a gas-permeable traveling grate, a device for the deposition of particulate matter - 30 - 0 09846/1146 bad «win al DS - 55653 Well on the grate in a bed, gas containment hoods above the grate, gas confinement hoods below the grate, which gas confinements like that are designed and arranged that a drying zone, a heating zone, a pre-cooling zone and a cooling zone is obtained, a continuous trough which Contains liquid and is supported by the grate, a shield extending from the hood above the Grate extends into the liquid, a sealing element which surrounds the hood below the grate and is supported by this, a sealing strip which surrounds the grate and is supported by it, and is constructed and arranged to make sliding and gas-tight contact with the sealing element is maintained, a device for the supply of air to the cooling zone with a superatmospheric Pressure sufficient to allow air to pass through with ' a downward pull through the grate to bring the cooling zone and the air to a superatmospheric one A sealing device is used to keep pressure on the same side of the grate in the heating zone above and below the grate between the pre-cooling zone and the cooling zone, means for withdrawing gas from the cooling zone, and for conducting the same with an upward pull through the grate in the pre-cooling zone, a device for extraction of the gases from the heating zone after they have passed through the grate with a downward pull and to direct the gases with an upward pull through the grate in the drying zone, and means for evacuating gases from the drying zone after it has passed through the grate cind, and a device for delivering the goods ÖAD ORIGINAL 009 * 46/1146 DS ■ - 55653 after it has passed through the mentioned zones is. 21. Plant according to claim 20, characterized in that the gas containment hoods move away from the device for depositing particulate material on the grate extend to the device for discharging the goods from the grate. '. · 22. Horizontally arranged circular traveling grate machine, characterized by a circular grate, stationary gas-limiting hoods which are arranged above the grate and cover at least the largest part of the grate, a stationary gas-limiting wind box which is arranged below the grate in a chamber-forming relationship to the hood, Liquid seals, which interact between the circular grate and the lower area of the stationary hood, mechanical seals, cooperate between the circular grate and the upper area of the stationary wind box, whereby the chamber delimited by the hoods and the wind box is sealed at its edges from the surrounding atmosphere means which divide the annular chamber into at least four and even-numbered treatment zones, and one. Device for introducing air into the last of the mentioned zones under a transferring pressure * - which is sufficient to bring the air to pass through the grate in each of the mentioned zones, 3, circular grate machine according to claim 22, characterized in that SAD ORlOlNAL DS - 556 53 JJ that the last-mentioned device is formed by a pump device which operates with a pressure which is sufficient to bring the air to pass through the mentioned zones without them passes through additional pumping devices, and through a gas suction device only in the first of the Treatment zones. . . ~, 33 - 009845/1 US