GB 2 189 711 A SPECIFICATION revolutions of the drum is adjusted
so,thatthe bulk material having been collected in the lower range of Equipmentfor moistening and simultaneous mixing the drum is forwarded bythe contrifugal force tothe of pulverized andlor granular materials deflecting equipment having been arrangedfixedly 70 in the upper range; said deflector removesthe The invention relatesto an equipmentfor material from the innerwall of thedrum in orderto moistening and simultaneous mixing of pulverized form a dropping jet; in the range of said dropping jet and/or granular materials; the equipment according an impact rotor is arranged, whereas bulk material is to the invention can be succesfully applied forthe moistened by spraying the liquid into the dropping continuous moistening and simultaneous mixing of 75 jet.
material tending to calcination, as e.g. dry-fiyash, By means of this drum-mixer proper mixing can be building materials and form sand. obtained with a relatively small structural height, In general, in thermal power plants a mixing worm however, the structural parts contained and used to be applied for moistening the dry-flyash performing mixing and moistening are subjected to resulting from slug removal to achieve dustfree 80 a strong wear.
transport. In course of transport moistening must The aim of the invention isto develop an take place in said mixing worms. equipment, which is well suitable for equal and In spite of several measures aimed atthe proper moistening of materials tending to adhesion controlled charge of the dry-flyash and waterand and getting calcined, so e.g. dry-flyash, with a low control of the number or revolutions, unmoistened 85 energy requirement and long useful life.
zones in the dry-flyash occur, resulting in dust The design of the equipment is based on the formation in course of transport. In addition,these recognition, in so far as, if the inner surface of the mixing worms are subjected to a considerable wear, drum is made of an elastic material and it isfixed on accordingly, dry-flyash can be transported only in thetwo ends of the drum only,the elastic lining course of a continuous operation and with a certain 90 while being rotated-will inhibitthe adhesion of the reserve. Dueto the combined processes of mixing material.
and delivery requirement of electric energy is utmost Accordingly,the invention relates to an equipment high. In spite of said deficiencies, even newthermal for moistening and simultaneous mixing of power plants are equipped with these mixing pulverized and granular materials in a mixer-drum worms. 95 the axis of which encloses an acute anglewiththe The experiment, in sense of which moistening was horizontal, arranged rotatably between a fixedly performed in granulators, did not yield an improved positioned inflow opening and an outlet; the inner operation. surface of the drum is lined with an elastic material, It is usual to arrange agitating means in a vertical expediently rubber and the moistening liquid is fed tankfor mixing binding materials, e.g. cementwith 100 through nozzles into the inside of the drum.
filling materials and additives, as well as water. The equipment according to the invention is However, these mixers are not suitable for designed so,thatthe elastic lining isformed of one moistening dry-flyash, as duetothe small quantityof or more elastic strips, which arefixed symmetrically water, in course of moistening thedry-flyash, onthespaced profiles bearing up againstthem unmoistened flyash is also dischargedfrom thetank 105 looselyandfixed on thecarrying laths arranged resulting in dustformation in course oftransport. between said profiles, atthe inflowand outflowof Mixerswith a levelled arrangementare also the drum, respectively, along the innersurface known, e.g.for manufacturing liquid thereof; the nozzles of the water conduit are dyestuff-dispersion, with dyestuff powder is providedwith openings directedtothe inside ofthe admixed to the water usedforthe process. 110 drum; atthe inflowaperture of the inflow housea Duetothe inconsiderable water requirement these metering device measuring flow rate is arranged,the equipments are not suitable for moistening outputof which is connected to a switch-unit which dry-fiyash either, as also in this case unmoistened controlsthe liquid to befed through thewater zones in the dry-flyash areto be reckoned with. conduit in dependence of the material to be In orderto achieve complete moistening of the 115 moistened and charged into the drum.
whole material charged and to reduce wear of the With a preferred embodiment of the invention the different structural groups, from the Patent equipment is designed so, as the water conduit is Specification DD 135169 an equipmentforthe provided with at least one transverse pipe, on which continuous moistening of dusty materials is known, nozzles are arranged, the opening of which are with which in a vertical tank a rotating shaftwith 120 facing the surface of the drum and directed opposite wings is arranged, at the same time water is fed into totheflow.
the tank. Although, by means of this arrangement Another preferred embodiment of the invention the material charged can be properly moistened, due can be characterized in that at both ends of the to the considerable structural height space transverse pipe a nozzle each is arranged, the requirement of the equiprTlent is too large. 125 sprayer heads of which are directed to the sidewall of In the Patent Specification DE 2 641361 a the th row-off house.
drum-mixer is disclosed, being suitable for Afurther characteristic lies in thatthe nozzles are preparing bulk materials, which can be rotated arranged - seen from the inflow house- in the first around a horizontal or approximately horizontal two-third of the drum, in a mutual equal distance.
axis, having a chamber-type drum; number of 130 The equipment according to the invention can be 2 GB 2 189 711 A 2 realized so, that the profiles havean ellipticshape. thedesign of its interior.The rings22 aresupported Itisto be considered as advantageous, if the in bearingsonthe rollers 23. The drum 1 can be equipment according to the invention isformedso, driven bya chain sprocket (not illustrated here), thatthe nozzles in the f irst-third are providedwitha arranged atthe middleoratthe end ofthedrum 1.
spraying cone. 70 Figure 1 also shows the metering device 14 Afurther preferred embodiment of the invention measuring the material to be moistened and showsthe characteristic feature, in so far as inthe arranged atthe inflow opening 13 and thewater second third of the drum the nozzles areformedwith condult7 supplying the moistening liquid.
an umbrella-shaped spraying cone. Figures 2 & 2a illustrate in detail the inside of the With another preferred embodiment of the 75 drum 1. As it becomes obvious from the Figure, invention the nozzles are provided with sprayhead along the inner surface of the drum 1, expediently directed at an acute angle atthe sidewall of the symmetrically, several profiles 2having an elliptic throw-off house. shapewith this embodiment- are arranged so, asto Another characteristic of the equipment according matchtothe mantle of the drum 1,while betweenthe tothe invention lies in that the f lowmeter contains a 80 single profiles a gap each is left. Elastic strips 3 made house, in thetop of which inflow opening forthe expediently of rubber are bearing up againstthe material to be moistened is formed and a measuring single profiles 2 loosely and they are fixed ontothe probe measuring the quantity of the material to be carrier laths 4 lying in the gaps between the single moistened in arranged therein; on the sidewall of the profiles 2. Expediently, the carrier laths 4 are house outflow openings lying above each other are 85 arranged in the full length of the mantle of the drum formed and said outflow openings are connected to 1, however, the strips 3 are fixed onto the carrier similarly shaped opening on the wall of the laths 4 atthe two ends of the drum 1 only. This collecting funnel, simultaneously, said collecting becomes obvious from Figure 3. The elastic strips 3 funnel communicates with the input of the inflow are bearing up againstthe profiles 2 loosely, house, further, the bottom of the house has a bottom 90 however between thetwo ends of the drum 1 they plate made of a porous material, belowwhich an aretightened. Between the places of fixation of the air-box- provided with an air-supply opening - isto elastic strips 3, i.e. between the places, wherethe befound. strips 3 arefixed ontothe carrier laths 4, in thewall 5 The invention will be described in detail by means of the drum 1 a plurality of openings are formed.
of preferred embodiments merely byway of 95 Figure 3 (a) and (b) give a schematicview of thewater example, with reference to the accompanying conduit 7, a detailed illustration thereof is given in drawings, wherein: Figure 4. In Figure 3 one of the positions of the elastic Figure l is the schematic side view of equipment strip 3 while being in motion is indicated with a according to the invention; discontinuous line. Profiles 2 can be made of any Figure2 is a sectional end view of the drum 100 optional neutrally reacting material, if wanted, with withoutwater supply and Figure 2a shows an cavities.
enlarged detail; Figure 3 showsthe arrangement of thewater Figures3a &3b are schematical end and side conduit system in the drum 1. It can bewell seen that views of the drum, respectively; in the upper part of the drum 1, within the elastic Figure 4Mustrates the arrangement of the water 105 stripsthe conduit system forfeeding the liquid for distributing nozzles of the water conduit in the moistening the material having been introduced into interior of the drum; the drum 1 is arranged. The system includes one or Figure 5 illustrates a metering device; more expediently parallel water conduits 7, on which Figure 6gives an example for another possible several nozzles 6 are arranged, equally distributed in arrangement of the nozzles; and 110 the length of the inside of the drum 1 and the Figures 7(a) & (b) correspond to Figures 3(a) and spraying openings of said nozzles are directed atthe (b) but show a further embodiment of the invention. inside of the drum. At least one of the water conduits Figure 1 shows a schematic side view of a 7 is connected to a furthertransverse pipeline 10 preferred equipment according to the invention. The facing the surface of the drum 1, on which nozzles 9 material will be moistened in the drum 1 and 115 are arranged with spraying openings facing the forwarded therefrom. The axis of the drum 1 surface of the drum 1 and opposite to theflow.
deviates from the horizontal and encloses Viewed from the inflow house 12 the nozzles 6 are expediently an acute angle therewith. It is placed via arranged in an equal mutual distancefrom each rollers 23 on a base,with trunnions or rings 22. Atthe other in the first two-third of the drum 1, in thefirst frontof the drum 1, on an inflow housing 12 an 120 third they are provided with an acute spraying cone, inflow opening 13 is formed through which the in the second third with an umbrella-shaped material to be moistened isfed into the drum 1. spraying cone. From the drum 1 the moistened Expedientlythe inflow housing 12 isformed with a material is led into the throw-off house 8, wherein a slight conicity, while the partwith the larger further transverse pipeline 10 can be arranged and diameter is coupledto the drum 1. Atthe otherend of 125 on thetwo endsthereof nozzles 11 can be installed the drum 1 a discharge orthrow-off housing 8 is directed atthe sidewall of thethrow-off house 8 atan arranged, through which the moistened material is acute angle.
discharged forfurther use ortransport. As it isto be seen in Figure 1, material to be The drum 1 forms an important part of the moistened is introduced through the inflow opening equipment according to the invention, in particular, 130 13. Expediently, the opening 13 is led through a 3 GB 2 189 711 A 3 measuring device 14measuring the quantity of the pipe 10ontheupper part of the water conduit 7 and material having been charged intothedrum 1; in the nozzles9thereon staying oppositetothe dependence of the quantity of the materials charged direction of flow areformed with well bundled quantity of water introduced into the drum can be spraying cones; the task lies in to clean partlythe regulated respectively controlled. Example of the 70 pipes of the water conduit 7 from the adhering measuring device 14 is to be seen in Figure 5. material, partlyto lead furtherwater quantityto the The measuring device 14 contains a collecting material, simultaneously a lubricating film isformed funnel 20 on which outlet openings 17 are formed in on the wall of the throw-off house 8, as a different heights. The house 15 fitting closelyto the consequence adhesion to the moistened material collecting funnel 20 communicates with the 75 can be avoided.
openings 17; material is charged through the inf low Thus the nozzle system in the inside of the drum 1 opening 16 on the house 15, on the bottom of the performs simultaneously several functions. Partly it house 15 there is a porous base plate 18 arranged, moistens unformiy the material, partly it cleans expediently made of felt, ceramics or sintered metal continuouslythe innerwall of the drum 1 and the sheet, belowthe base plate 18 an air-box is to be 80 whole waterconduit 7. so the material to be found having an air-inflow opening. The measuring moistened cannot adhere on the different parts of probe 21 extends into the house 15. As a measuring the equipment. A special advantage lies in thatwear probe e.g. a capacitive detector may be used, or any of the single components does not exceed the usual other suitable detector, by the aid of which level of extent, frequent repair becomes superflupous, even the material in the house can be measured and which 85 at a high delivery output proper moistening and is able to generate a well processable signal. In dustf ree transport are ensured.
dependence of the material outflowfrom the The use of reference numbers in certain of the openings 17 of the house 15 water quantity supplied appended claims arefor illustration only and no through the water conduit 7 can bewell controlled. limitation of scope of the claims is intended thereby.
Figure 7 shows a further embodiment of the 90