CN104894323A - Air cooling device and method of breathable material - Google Patents
Air cooling device and method of breathable material Download PDFInfo
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- CN104894323A CN104894323A CN201510287941.2A CN201510287941A CN104894323A CN 104894323 A CN104894323 A CN 104894323A CN 201510287941 A CN201510287941 A CN 201510287941A CN 104894323 A CN104894323 A CN 104894323A
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Abstract
The invention relates to the technical field of cooling of breathable materials, and provides an air cooling device and method of the breathable materials. The air cooling device of the breathable material is characterized in that a plurality of layers of material falling plates are arranged, and material falling holes in adjacent material falling plates are in staggered distribution along the projection in the vertical direction, so that the falling height of the materials every time is the height of each material falling chamber, and the problems that the height fall of the materials is large, and the pulverization rate is high are solved. On the basis of the device and method, rakes which move relative to the materials are arranged in the material falling chambers, and the materials are stirred by the rakes to do gathering or scattering motion, so that the strokes of the materials under the same height condition are longer; the materials are in full contact with cooling gas, the cooling time is longer, and therefore the heat exchange efficiency is improved. In addition, the device is vertically arranged, and therefore the occupied area is small.
Description
Technical field
The present invention relates to the cooling technology field of the material with ventilation property, particularly relate to a kind of air-cooling apparatus and method of ventilative material, be more specially the air-cooling apparatus and method that are applicable to direct-reduced iron.
Background technology
Iron And Steel Industry is mainstay of the national economy industry, and its energy-output ratio is large, and pollutant discharge amount is also large, while providing high-quality steel to society, also brings great effect to physical environment.Wherein, iron and steel enterprise's energy consumption and waste discharge mainly concentrate on system for blast furnace ironmaking, and therefore people have carried out the research of a large amount of non-blast furnace ironmaking novel process, and make some progress.Wherein developing the swiftest and the most violent is Direct Reduction Technology and smelting reduction technology.
Wherein, Direct Reduction Technology refers to coal, gas or liquid fuel for the energy and reductive agent, and lower than the ironmaking production technique under temperature of fusion, reduction of iron ore being become solid iron, its product is direct-reduced iron (i.e. DRI, direct reduced iron), also claim sponge iron.This product, without fusing, still keeps ore profile, because reduction oxygen loss forms a large amount of pore, examines under a microscope likeness in form sponge and gains the name.Direct-reduced iron iron-holder is generally more than 90%, and chemical composition stability, foreign matter content is low, is not only the substitute of steel scrap, the steel of production high-quality especially, the indispensable raw material of Clean Steel.In addition, make steel with addition of direct-reduced iron be control, the Main Means of harmful element in dilution steel.Therefore, direct-reduced iron improves steel product quality, increase rolling shapes, the indispensable raw material of the development compact flow process of ferrous metallurgy.
Cooling is an extremely important link in direct-reduction process for making iron, the roasting of direct-reduction ferrous products come out of the stove after temperature very high, be about 1100 DEG C.For ensureing that belt function carries out conveying delivery to direct-reduced iron, less than 150 DEG C need be cooled to.Be different from general metallurgical product, high-temperature direct reduced iron goods, when running into sky G&W, can produce vigorous oxidation burning, the iron restored be become metal oxide again, thus causes finished metal rate significantly to reduce and Pulverization ratio significantly increases.
The method of cooling of current direct-reduced iron has: immersion cooling, the cooling of interior spray water cooling cylinder and the cooling of outer spray water cooling cylinder.Immersion cooling is cooling of being soaked in tank by direct-reduced iron, and the direct-reduced iron of high temperature drops into the danger forming bumping in water.In addition, immersion cooling and the cooling of interior spray water cooling cylinder all exist that Pulverization ratio is high, yield rate is low, water content is high needs the problems such as redrying, easily generation secondary oxidation.The cooling of outer spray water cooling cylinder carries out heat exchange by cooling barrel due to heat-eliminating medium, and rate of heat exchange is lower, the cooling water that needs consumption a large amount of, energy consumption are high.And also all there is based on the refrigerating unit of the multiple direct-reduced iron of these three kinds of method and technology personnel propositions the defect caused based on aforesaid method.Further, all there is the problem that cannot utilize waste heat in above-mentioned three kinds of methods.
In view of this, application number is that the patent of 201110346488.X is proposed a kind of rare gas element that uses and carried out the device cooled by thermopnore.The thermopnore that this device sets up multilayer to turn back in a straight tube erect, direct-reduced iron relies on self gravitation fold return motion from top to down, and rare gas element enters cylindrical shell from bottom, discharges from top through after multilayer thermopnore.This device direct-reduced iron height fall is large, and Pulverization ratio is higher.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is just to provide a kind of air-cooling apparatus and method of ventilative material, is convenient to carry out high efficiente callback to the waste heat of material, and material Pulverization ratio is low.When this ventilative material air-cooling apparatus is applicable to the cooling of direct-reduced iron, on the basis that material Pulverization ratio is low, the shortcoming that immersion cooling, the cooling of interior spray water cooling cylinder and outer spray water cooling cylinder cooling technology exist can be avoided.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of air-cooling apparatus of ventilative material, comprise the turning axle that material tower, claw, rotary drive unit and the axis along described material tower distribute; The top board of described material tower offers opening for feed and venting port, the base plate of described material tower offers discharge gate and inlet mouth; Be provided with polylith feeding plate in described material tower, described material tower is longitudinally divided into multiple material feeding chamber by described feeding plate; Described feeding plate offers material falling hole and air holes, and the material falling hole projection in the horizontal plane on adjacent described feeding plate is in staggered distribution; The described claw being convenient to blanking is respectively arranged with in material feeding chamber described in each; Described turning axle one end connects described rotary drive unit, and the other end extend into described material tower inside and is connected with described claw.
Preferably, sealing unit is provided with between the housing of described turning axle and described material tower.
Preferably, described sealing unit is hydraulic seal unit, comprises and to be fixedly connected with described material tower and to be positioned at the week annular liquid flume to the periphery of described turning axle, and be fixed on the circular seal lid coordinated on described turning axle and with described annular liquid flume.
Preferably, described opening for feed and discharge gate are all connected with rotary seal valve.
Preferably, the described material falling hole on adjacent described feeding plate lays respectively at central position and the position, outer of described feeding plate.
Preferably, the arranged direction of the claw in adjacent described material feeding chamber is contrary.
Preferably, the claw in each described material feeding chamber is distributed on the concentric(al) circles of axle centered by described turning axle.
Preferably, described claw is connected with described turning axle by connecting rod.
The present invention also provides a kind of air cooling approach of ventilative material, adopts ventilative material air-cooling apparatus of the present invention to carry out, comprises the following steps:
S1: the ventilative material of high temperature is injected by opening for feed in the material feeding chamber of material tower; Meanwhile, cooling gas is passed into material tower from inlet mouth, cooling gas is discharged by venting port after the air holes on feeding plate;
S2: start rotary drive unit, turning axle drives claw to rotate, and makes to there is relative movement between claw and material, and then is entered in next material feeding chamber by the material falling hole of layout straggly by material, and discharge eventually through discharge gate;
S3, finally will carry out waste heat recovery from venting port expellant gas through the laggard waste heat pot of dedusting, then enter gas quench system after being pressurizeed by recirculation blower, and cooled gas is passed in the inlet mouth of described ventilative material air-cooling apparatus, so circulate.
Preferably, the rotating speed of described turning axle is 3-5 rev/min; The described cooling gas passed into is rare gas element.
(3) beneficial effect
Technical scheme of the present invention has following beneficial effect: ventilative material air-cooling apparatus of the present invention, by arranging multilayer feeding plate, and the projection that the material falling hole on adjacent feeding plate is vertically gone up is in staggered distribution, thus the height of drop making material each is the height of each material feeding chamber, and then solve the problem that height of materials drop is large, Pulverization ratio is high.
On this basis; the claw that there is relative movement between material is provided with in material feeding chamber; under the stirring of claw, material produces and gathers or disjuctive movement; thus the stroke of material is longer in equal height situation; thus material fully contacts with cooling gas; cooling time is elongated, therefore improves heat exchange efficiency.In addition, this device is vertically arranged, thus floor space is little.
When ventilative material air-cooling apparatus of the present invention is used for the cooling of direct-reduced iron, because the medium of cooling is rare gas element, avoid direct-reduced iron to contact with air or water in process of cooling, solving material needs redrying and the problem that secondary oxidation easily occurs.And the rare gas element after using can enter waste heat pot and carry out waste heat recovery, solves the unrenewable problem of high-temperature direct reduced iron.
In preferred version of the present invention, adopt hydraulic seal unit to seal between the shell of turning axle and material tower, thus improve the stopping property of device, solve the problem of the secondary oxidation of the direct-reduced iron brought in Air infitration material feeding chamber.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the air-cooling apparatus of ventilative material of the present invention;
Fig. 2 is the cross-sectional schematic at A-A, C-C place in Fig. 1;
Fig. 3 is the cross-sectional schematic at B-B place in Fig. 1;
In figure: 1, opening for feed; 2, venting port; 3, claw; 4, tower is expected; 5, inlet mouth; 6, discharge gate; 7, Double layer rotating seal valve; 8, the first layer feeding plate; 9, second layer feeding plate; 10, third layer feeding plate; 11, material falling hole; 12, air holes; 13, turning axle; 14, CD-ROM drive motor; 15, hydraulic seal unit; 16, connecting rod.
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are described in further detail.Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.
In describing the invention, it should be noted that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " vertically ", " level ", " top ", " end ", " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
Without loss of generality, the present embodiment is described for the air-cooling apparatus being applicable to direct-reduced iron.Should be understood that, the air-cooling apparatus of the present embodiment can also be applicable to the cooling that other exists the ventilative material of background technology associated problem, the especially bulk material such as particulate state, bulk.
Refer to Fig. 1, the ventilative material air-cooling apparatus of the present embodiment, comprise the turning axle 13 that material tower 4, claw 3, rotary drive unit and the axis along described material tower 4 distribute; Be provided with polylith feeding plate in described material tower 4, described material tower 4 is longitudinally divided into multiple material feeding chamber by described feeding plate.Only illustrate in accompanying drawing that feeding plate is the situation of three layers, in obvious the application the quantity of feeding plate not by this illustrated case restriction and can be any multilayer.
In the present embodiment, the top board of material tower 4 offers opening for feed 1 and offer discharge gate 6 on the base plate of material tower 4.Under the height prerequisite not increasing ventilative material air-cooling apparatus, by arranging multilayer feeding plate, the dropping process segmentation of direct-reduced iron can be made, and then each height of drop of direct-reduced iron equals the height of corresponding material feeding chamber, avoids the problem that direct-reduced iron height fall is large, Pulverization ratio is high.Direct-reduced iron falls into lower one deck material feeding chamber by the material falling hole 11 that feeding plate is arranged after entering material tower 4 material feeding chamber topmost by opening for feed 1, and eventually through discharge gate 6 discharger.
Wherein it should be noted that, skip certain layer of feeding plate in order to avoid direct-reduced iron and directly enter lower one deck material feeding chamber, even direct situation of discharging from discharge gate 6 occurs, control the degradation rate of direct-reduced iron, and extend its stroke in device inside, the projection that material falling hole 11 on adjacent feeding plate is vertically gone up is in staggered distribution, and there is not lap when also namely the material falling hole 11 of adjacent layers feeding plate is projected in same level.
On this basis, for the ease of the blanking of direct-reduced iron, the claw 3 being convenient to blanking is provided with in every layer of material feeding chamber, claw 3 and material feeding chamber radial direction are at an angle, and the material feeding chamber relative to direct-reduced iron place rotates, and then continuously direct-reduced iron is expelled in lower one deck material feeding chamber, reach the object of inner discharge and prolongation material stroke.
Particularly, the concrete installation direction of the claw 3 in every layer of material feeding chamber determines according to the position of material falling hole 11.Material falling hole 11 in the present embodiment on the first layer feeding plate 8 is arranged on base plate central position, thus the claw 3 corresponding with it needs direct-reduced iron toward central blanking hole 11 location push; Material falling hole 11 on second layer feeding plate 9 is arranged on position, base plate outer, thus the claw 3 corresponding with it needs direct-reduced iron toward base plate outer location push; Material falling hole 11 on third layer feeding plate 10 is arranged on base plate central position, thus the situation about arranging with first time feeding plate of claw 3.In that case, the arranged direction of the claw 3 in adjacent described material feeding chamber is contrary, refers to Fig. 2 and Fig. 3.
Under the stirring of claw 3, direct-reduced iron is gathered or is scattered; therefore there is the motion of horizontal direction, thus in equal height situation, the stroke of direct-reduced iron is longer, thus direct-reduced iron fully contacts with cooling gas; cooling time is elongated, therefore improves heat exchange efficiency.In addition, with regard to the present embodiment, the third layer bed of material in the first layer bed of material in the first layer material feeding chamber, the second layer bed of material in second layer material feeding chamber and third layer material feeding chamber can be tied and mix evenly by claw 3, ensure that the ventilative homogeneity of each bed of material, thus ensure that the resistance uniformity of cooling draught.
It should be noted that, the setting of material falling hole 11 is not limited to the situation of the present embodiment act, as long as can ensure the height of drop that direct-reduced iron is each and cooling stroke.
In order to realize above-mentioned claw 3 rotating relative to material feeding chamber, be provided with the turning axle 13 that the axis along described material tower 4 distributes.Described turning axle 13 one end connects rotary drive unit, and the other end extend into described material tower 4 inside and is connected with described claw 3.Preferably by connecting rod 16, described claw 3 is fixed on described turning axle 13, and the claw 3 in each described material feeding chamber is distributed on the concentric(al) circles of axle centered by described turning axle 13.In addition, preferably but must not rotate fixed cell be CD-ROM drive motor 14.
The problem of the secondary oxidation of the direct-reduced iron brought in Air infitration material feeding chamber, arranges sealing unit between turning axle 13 and the shell of material tower 4.The present embodiment hydraulic seal unit 15 of providing a kind of sealing effectiveness desirable on this basis.Be described for the situation that turning axle 13 is extend in material feeding chamber by the top board of material tower 4, now on top board, be provided with annular liquid flume, turning axle 13 stretches in material tower 4 along the central axis of described annular liquid flume, and turning axle 13 is fixed with the circular seal lid coordinated with described annular liquid flume.Described circular seal lid extend in described annular liquid flume, thus drives described circular seal to cover to rotate in described annular liquid flume when turning axle 13 rotates.
In order to cool the direct-reduced iron in material feeding chamber, material tower 4 base plate of the present embodiment offers inlet mouth 5, and the top board of material tower 4 offers venting port 2.Cooling gas is entered in material tower 4 by inlet mouth 5, and enters into corresponding material feeding chamber by the air holes 12 that each layer feeding plate is offered, and finally discharges from venting port 2.Wherein, the air holes 12 on preferred base plate is uniformly distributed, and to make cooling gas can pass the bed of material uniformly, avoids the phenomenon occurring altering wind, and direct-reduced iron is cooled evenly.
In order to protect the direct-reduced iron at opening for feed 1 and discharge gate 6 place, the opening for feed 1 of the present embodiment is all connected with rotary seal valve with discharge gate 6, and preferred multiple rotary seal valve series connection, be Double layer rotating seal valve 7 in the present embodiment.
The ventilative material air-cooling apparatus of the present embodiment is vertically arranged, solves the problem that floor space is excessive.
The present embodiment also provides a kind of air cooling approach of direct-reduced iron, comprises the following steps:
S1: the ventilative material of high temperature is injected by opening for feed 1 in the material feeding chamber of material tower 4; Meanwhile, cooling gas is passed into material tower 4 from inlet mouth 5, cooling gas is discharged by venting port 2 after the air holes 12 on feeding plate;
S2: start rotary drive unit, turning axle 13 drives claw 3 to rotate, and makes to there is relative movement between claw 3 and material, and then is entered in next material feeding chamber by the material falling hole 11 of material by layout straggly, and discharges eventually through discharge gate 6;
S3, finally will carry out waste heat recovery from venting port 2 expellant gas through the laggard waste heat pot of dedusting, then enter gas quench system after being pressurizeed by recirculation blower, and cooled gas is passed in the inlet mouth 5 of described ventilative material air-cooling apparatus, so circulate.
Wherein, the rotating speed of preferred described turning axle 13 is 3-5 rev/min; The described cooling gas passed into is rare gas element.
Particularly, the initial temperature of direct-reduced iron is about 1100 DEG C, and it by entering the first layer material feeding chamber from opening for feed 1 after Double layer rotating seal valve 7, and forms the first layer bed of material.The first layer bed of material is gathered at the effect Xia Xiang center of claw 3, and is entered in second layer material feeding chamber by the material falling hole 11 of central position, and forms the second layer bed of material.The claw 3 corresponding with the second layer bed of material rotates, and makes it scatter to surrounding, and drops to third layer material feeding chamber from the material falling hole 11 of surrounding, and form the third layer bed of material, the third layer bed of material is gathered at the effect Xia Xiang center of claw 3 equally, and is discharged by discharge gate 6.The temperature of the direct-reduced iron of final discharge is lower than 150 DEG C.
Meanwhile, the inertia cooling gas of low temperature enters into the bottom of material tower 4 from inlet mouth 5, move upward, cool simultaneously to the direct-reduced iron of high temperature through the air holes 12 on third layer feeding plate 10.Inertia cooling gas is discharged from venting port 2 successively after second layer material feeding chamber and the first layer material feeding chamber.Inertia cooling gas after heat exchange carries out waste heat recovery through the laggard waste heat boiler of dedusting, then enters refrigerating unit after being pressurizeed by recirculation blower and recycle.
Adopt rare gas element to cool direct-reduced iron in the present embodiment, avoid pelletizing and contact with air or water in process of cooling, solve direct-reduced iron secondary oxidation and contain water problem; Further, rare gas element can enter waste heat boiler and carry out waste heat recovery after dedusting, solves the unrenewable problem of direct-reduced iron heat.
Above embodiment is only for illustration of the present invention, but not limitation of the present invention.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, various combination, amendment or equivalent replacement are carried out to technical scheme of the present invention, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (10)
1. an air-cooling apparatus for ventilative material, is characterized in that, comprises the turning axle that material tower, claw, rotary drive unit and the axis along described material tower distribute; The top board of described material tower offers opening for feed and venting port, the base plate of described material tower offers discharge gate and inlet mouth; Be provided with polylith feeding plate in described material tower, described material tower is longitudinally divided into multiple material feeding chamber by described feeding plate; Described feeding plate offers material falling hole and air holes, and the material falling hole projection in the horizontal plane on adjacent described feeding plate is in staggered distribution; The described claw being convenient to blanking is respectively arranged with in material feeding chamber described in each; Described turning axle one end connects described rotary drive unit, and the other end extend into described material tower inside and is connected with described claw.
2. the air-cooling apparatus of ventilative material according to claim 1, is characterized in that, is provided with sealing unit between the housing of described turning axle and described material tower.
3. the air-cooling apparatus of ventilative material according to claim 2, it is characterized in that, described sealing unit is hydraulic seal unit, comprise and to be fixedly connected with described material tower and to be positioned at the week annular liquid flume to the periphery of described turning axle, and be fixed on the circular seal lid coordinated on described turning axle and with described annular liquid flume.
4. the air-cooling apparatus of ventilative material according to claim 1, is characterized in that, described opening for feed and discharge gate are all connected with rotary seal valve.
5. the air-cooling apparatus of ventilative material according to claim 1, is characterized in that, the described material falling hole on adjacent described feeding plate lays respectively at central position and the position, outer of described feeding plate.
6. the air-cooling apparatus of ventilative material according to claim 5, is characterized in that, the arranged direction of the claw in adjacent described material feeding chamber is contrary.
7. the air-cooling apparatus of ventilative material according to claim 1, is characterized in that, the claw in each described material feeding chamber is distributed on the concentric(al) circles of axle centered by described turning axle.
8. the air-cooling apparatus of ventilative material according to claim 7, is characterized in that, described claw is connected with described turning axle by connecting rod.
9. an air cooling approach for ventilative material, is characterized in that, adopts the ventilative material air-cooling apparatus in claim 1-8 described in any one to carry out, comprises the following steps:
S1: the ventilative material of high temperature is injected by opening for feed in the material feeding chamber of material tower; Meanwhile, cooling gas is passed into material tower from inlet mouth, cooling gas is discharged by venting port after the air holes on feeding plate;
S2: start rotary drive unit, turning axle drives claw to rotate, and makes to there is relative movement between claw and material, and then is entered in next material feeding chamber by the material falling hole of layout straggly by material, and discharge eventually through discharge gate;
S3, finally will carry out waste heat recovery from venting port expellant gas through the laggard waste heat pot of dedusting, then enter gas quench system after being pressurizeed by recirculation blower, and cooled gas is passed in the inlet mouth of described ventilative material air-cooling apparatus, so circulate.
10. method according to claim 9, is characterized in that, the rotating speed of described turning axle is 3-5 rev/min; The described cooling gas passed into is rare gas element.
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| CN201510287941.2A CN104894323B (en) | 2015-05-29 | 2015-05-29 | A kind of air-cooling apparatus of ventilative material and method |
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| CN201510287941.2A CN104894323B (en) | 2015-05-29 | 2015-05-29 | A kind of air-cooling apparatus of ventilative material and method |
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| CN104894323B CN104894323B (en) | 2017-03-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109506483A (en) * | 2018-11-16 | 2019-03-22 | 东北大学 | A kind of vanadium slag exhaust heat recovering method and device |
| CN109612286A (en) * | 2018-12-10 | 2019-04-12 | 东北大学 | A kind of vanadium slag waste heat recycling system and its application method |
| CN112856966A (en) * | 2021-01-22 | 2021-05-28 | 王子龙 | Preparation method of composite protein pig feed |
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| GB2005388A (en) * | 1977-07-01 | 1979-04-19 | Dessau Zementanlagenbau Veb | A method of and an apparatus for effecting heat exchange between a cooling gas and granular material |
| CN103088213A (en) * | 2011-11-04 | 2013-05-08 | 中冶长天国际工程有限责任公司 | Device and method for cooling direct reduction iron |
| CN103225959A (en) * | 2013-04-10 | 2013-07-31 | 中建材（合肥）粉体科技装备有限公司 | Air cooler |
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2015
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| US3836131A (en) * | 1973-12-26 | 1974-09-17 | Mildrex Corp | Apparatus for cooling a moving bed of solid, gas permeable particles |
| GB2005388A (en) * | 1977-07-01 | 1979-04-19 | Dessau Zementanlagenbau Veb | A method of and an apparatus for effecting heat exchange between a cooling gas and granular material |
| CN103088213A (en) * | 2011-11-04 | 2013-05-08 | 中冶长天国际工程有限责任公司 | Device and method for cooling direct reduction iron |
| CN103225959A (en) * | 2013-04-10 | 2013-07-31 | 中建材（合肥）粉体科技装备有限公司 | Air cooler |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109506483A (en) * | 2018-11-16 | 2019-03-22 | 东北大学 | A kind of vanadium slag exhaust heat recovering method and device |
| CN109612286A (en) * | 2018-12-10 | 2019-04-12 | 东北大学 | A kind of vanadium slag waste heat recycling system and its application method |
| CN112856966A (en) * | 2021-01-22 | 2021-05-28 | 王子龙 | Preparation method of composite protein pig feed |
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