CN108585555B - Industrial powder clinker homogeneous calcination preparation equipment and preparation method - Google Patents

Industrial powder clinker homogeneous calcination preparation equipment and preparation method Download PDF

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Publication number
CN108585555B
CN108585555B CN201810667025.5A CN201810667025A CN108585555B CN 108585555 B CN108585555 B CN 108585555B CN 201810667025 A CN201810667025 A CN 201810667025A CN 108585555 B CN108585555 B CN 108585555B
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suspension
pipeline
rotary kiln
furnace
stage cyclone
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CN108585555A (en
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柴东先
王宏彪
郭勇
刘虎
候维红
苑立东
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Wuhan Ujoin Building Material Technology Co ltd
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Wuhan Ujoin Building Material Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/02—Lime
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C04B2/108—Treatment or selection of the fuel therefor

Abstract

The invention provides a homogeneous calcination preparation device for industrial powder clinker, which comprises a mill, a lifter, a suspension preheater, a hollow suspension furnace, a rotary kiln and a grate cooling dust collector, and provides a homogeneous calcination method for preparing the industrial powder clinker by using the homogeneous calcination preparation device for the industrial powder clinker. By using the hollow suspension furnace as the decomposing furnace, the full decomposition of carbonate in the decomposing furnace is improved, and the homogeneous calcination of the powder clinker is realized, so that the powder clinker product with uniform product and stable property is obtained.

Description

Industrial powder clinker homogeneous calcination preparation equipment and preparation method
Technical Field
The invention relates to a homogeneous calcination preparation method of industrialized powder clinker, in particular to a technology for realizing the stable calcination of industrialized powder clinker by combining a suspension preheater, a hollow suspension furnace, a rotary kiln and a grate cooling dust collector.
Background
The powder clinker is an important industrial raw material at present, such as magnesium oxide, calcium oxide and the like. The calcined finished product of the common clinker is a sphere with irregular size, a solid phase is wrapped by a liquid phase component of the calcined clinker to form a ball, and the powder clinker is formed by grinding, so that the finished product can be prepared only by high energy consumption. The powder clinker obtained by calcining raw materials with little or no liquid-phase components can meet the industrial requirements without secondary grinding.
In industry, the production method of powder clinker is usually to use raw materials of carbonate ore, through the methods of crushing, suspension preheating and calcining, and finally to collect the powder clinker. For example, in a conventional fluidized bed furnace, preheated air in the lower part of the furnace blows up ore particles, the ore particles are suspended in a hearth to fluidize raw materials, and the fluidized raw materials are heated and decomposed by hot gas injected from the side part of the furnace body. But the process has large energy consumption, short retention time of materials in the furnace, incomplete decomposition of the materials, small grain development size and small activity regulation space. And on the basis of suspension preheating and calcining, people develop a predecomposition kiln technology, a decomposing furnace is additionally arranged between a suspension preheater and a rotary kiln, 30-60% of fuel is added into the decomposing furnace, so that the combustion heat release process of the fuel and the heat absorption decomposition process of raw materials are simultaneously and very quickly carried out in a suspension state or a fluidized state, the decomposition reaction of carbonate is basically completed before the raw materials enter the rotary kiln, and the calcining efficiency of a kiln system is greatly improved. A great deal of research is carried out on the process of producing the powder clinker by the suspension preheating, the decomposing furnace and the calcining. As disclosed in patent publication No. CN102603216A, an active lime calcination system is disclosed, comprising: a predecomposition oven for receiving a limestone feedstock to be calcined and predecomposing the limestone feedstock; the rotary kiln is used for receiving the material containing the pre-decomposition products from the pre-decomposition furnace, outputting the formed active lime and simultaneously providing the first flue gas to the pre-decomposition furnace. Wherein the calcining system further comprises a pre-decomposition furnace combustion device which is used for generating second flue gas and supplying the second flue gas into the pre-decomposition furnace, so that the limestone raw material is pre-decomposed in the pre-decomposition furnace under the action of the first flue gas and the second flue gas. However, the technical scheme does not comprise a step of suspension preheating, so that the sufficient contact and decomposition uniformity of the materials and a heat source is reduced, the grain growth and activity regulation space of the clinker is limited, and the decomposition efficiency is lower. Patent document No. CN101987783A discloses a method for producing active limestone powder by calcining limestone with gas in a suspension state preheating decomposing furnace, in which the decomposing and calcining processes are completed in a decomposing chamber and the active preparation process is completed in a five-stage cyclone, but the above technical scheme has no part of a rotary kiln, the retention time of the material in the decomposing chamber and the cyclone is short, the material cannot be kept warm for a long time, the crystal grain of the material is not fully developed, the calcination is not thorough, the decomposition efficiency is low, and the clinker activity regulation space is small. Patent publication No. CN106220004A discloses a rotary kiln production line for directly calcining powdered lime, which comprises a pre-suspension device, a decomposing furnace and a rotary kiln, wherein the decomposing furnace is connected with a fourth-stage cyclone cylinder and the rotary kiln, preheated raw materials enter the decomposing furnace for decomposition, and then are conveyed to the rotary kiln for calcination, and finally powdered lime clinker is obtained. However, the technical scheme does not limit the specific structure of the decomposing furnace, and the five-stage cyclone cylinder only plays a role in air supply, so that the utilization rate is low.
The inventor finds that the suspension preheating, the decomposing furnace and the rotary kiln are organically combined, the uniform heating of powder can be effectively improved, the activity of the formed product is uniform, the cooling speed is controlled by the grate cooling dust collector, and the powder clinker is classified in a dust removal mode to obtain the powder clinker with different fineness, so the technical scheme of the publication No. CN106220004A is preferable. However, the above technical solutions still have certain technical problems. The decomposition is an important ring, and only when the carbonate in the decomposition furnace is fully decomposed, the oxide powder in the rotary kiln is calcined to obtain more uniform product activity; on the contrary, the carbonate enters the rotary kiln to be calcined, so that the activity of the powder is not uniform, and the distribution range is large. However, if the powder is decomposed in a better suspension state, the powder is heated uniformly, and the sufficient decomposition of the carbonate can be effectively controlled, so that the structure of the decomposing furnace needs to be improved, a connecting pipeline between the decomposing furnace and the preheater is prolonged to form a structure of 'furnace body + pipeline', the volume of the decomposing furnace is enlarged, and meanwhile, the structure in the furnace is improved, the retention time of the material in the furnace is prolonged, and the material is sufficiently decomposed in a hollow suspension manner in the decomposing furnace. Secondly, in the scheme, the raw materials enter the decomposing furnace from the fourth-stage cyclone cylinder and then enter the rotary kiln, the fifth-stage cyclone cylinder does not play a role in suspension preheating, and high-temperature airflow entering the fifth-stage cyclone cylinder from the rotary kiln only passes through the fifth-stage cyclone cylinder and is not effectively utilized. Therefore, the material flow direction needs to be improved: the material enters the central control suspension furnace from the fourth-stage cyclone cylinder of the suspension preheater for suspension decomposition, then is conveyed into the fifth-stage cyclone cylinder, enters the fifth-stage cyclone cylinder through the inlet pipeline (heat exchange pipeline) under the action of the ascending hot air flow, is continuously decomposed in the process, and then enters the rotary kiln from the material outlet of the fifth-stage cyclone cylinder to be calcined into clinker powder. Meanwhile, the inlet pipeline of the fifth stage cyclone is longer, so that the heat exchange utilization rate of the fifth stage cyclone can be effectively improved, the decomposition time is prolonged, the full decomposition of carbonate is facilitated, and a product with stable activity can be obtained in the calcining step.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an industrialized homogeneous calcination preparation method of powder clinker, which promotes the sufficient decomposition of carbonate in a decomposing furnace and realizes the homogeneous calcination of the powder clinker, thereby obtaining the powder clinker product with uniform product and stable property.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a preparation device for uniformly calcining industrial powder clinker, which comprises a mill 1, wherein the mill 1 is connected with a suspension preheater 3 through a lifter 2, a material outlet of a fifth-stage cyclone of the suspension preheater 3 is communicated with a calcining chamber in a rotary kiln 7, a material outlet of a fourth-stage cyclone of the suspension preheater 3 is communicated with a hollow suspension furnace 4, a material outlet of the hollow suspension furnace 4 is communicated with the upper part of the fifth-stage cyclone of the suspension preheater 3 through a first pipeline 41, and a first hot air pipeline 71 of the rotary kiln 7 is connected with the bottom of the hollow suspension furnace 4; the first pipeline 41 is a bent pipeline, and the second hot air flow pipeline 72 of the rotary kiln 7 is communicated with the first pipeline 41 at the bent position; the outlet of the calcining chamber of the rotary kiln 7 is connected with a cold grate dust collector 5; one path of the fuel bin 6 is communicated with a combustion chamber of the rotary kiln 7, the other path is communicated with the hollow suspension furnace 4, the hollow suspension furnace 4 is in an on-line type, and the suspension decomposition of the powder is realized through the hot air flow at the bottom and the fuel combustion.
The industrial powder clinker homogeneous calcining preparation equipment has the following working mode: the mill 1 grinds raw meal, the raw meal is conveyed to the suspension preheater 3 through the lifter 2, the raw meal is conveyed to a first-stage cyclone cylinder of the suspension preheater 3 by a second-stage cyclone cylinder heat flow of the suspension preheater 3, then the raw meal is conveyed to a second-stage cyclone cylinder of the suspension preheater 3 by a third-stage cyclone cylinder heat flow of the suspension preheater 3 from a first-stage cyclone cylinder material outlet of the suspension preheater 3, the raw meal is conveyed to the hollow suspension furnace 4 from a fourth-stage cyclone cylinder material outlet of the suspension preheater 3 for suspension decomposition, then the raw meal is conveyed to a fifth-stage cyclone cylinder of the suspension preheater 3, the decomposition is continued under the heat supply of a hot air flow of the first pipeline 41, then the raw meal reaches the rotary kiln 7 from a material outlet of the fifth-stage cyclone cylinder of the suspension preheater 3 to be calcined into cooked meal powder, finally, the cooling speed is controlled by the grate cooler 5, and the, obtaining the powder clinkers with different fineness.
Furthermore, the rotary kiln 7 adopts a rotary kiln with the diameter not less than 2.5m of kiln cylinder.
Furthermore, the grate cooling dust collector 5 adopts the combination of a grate cooler and a cloth bag dust collection.
Further, the fuel in the fuel bin 6 is gas fuel, liquid fuel or solid fuel, such as coal gas, gasoline, coal powder, etc.
Further, the raw material is any raw material whose powder clinker can not be sintered, such as magnesite and limestone.
Further, the powder clinker is magnesium oxide or calcium oxide.
Further, the temperature of the hollow suspension furnace is 700-1000 ℃, preferably 800-900 ℃; the temperature of the rotary kiln is 900-1500 ℃, preferably 950-1250 ℃. However, no matter the temperature of the rotary kiln and the hollow suspension furnace is selected, the temperature of the rotary kiln is higher than that of the hollow suspension furnace in the same production process.
Further, the second aspect of the present invention provides a preferred structure of the above hollow suspension furnace 4, comprising an inner chamber 42 and an outer chamber 43; the bottom of the inner chamber 42 is conical without a top; the bottom of the inner cavity 42 is connected with a first hot air flow pipeline 71; the top of the outer cavity 43 is higher than the inner cavity, the bottom of the outer cavity is an inclined plane, and the lowest point of the outer cavity is a material outlet and is connected with the first pipeline 41; the top of the outer cavity 43 is provided with a second pipeline 44 extending into the middle part of the inner cavity and communicated with a material outlet of a fourth-stage cyclone cylinder of the suspension preheater 3; the top of the outer cavity 43 is also provided with a third hot air flow pipeline 45 which is communicated with the upper part of a fifth stage cyclone cylinder of the suspension preheater 3; the first duct 41 is a bent duct, and the first duct 41 communicates with the second hot gas flow duct 72 at the bent point.
The decomposition process of the preheated raw materials in the hollow suspension furnace is as follows: the preheated raw meal enters the middle part of the inner cavity 42 of the hollow suspension furnace from the material outlet of the fourth-stage cyclone of the suspension preheater 3 through a second pipeline 44; the preheated raw material is decomposed in a suspension way under the action of hot air flow at the bottom of the inner cavity 42 of the hollow suspension furnace, gradually deposits in the outer cavity 43, reaches the material outlet and the first pipeline 41 under the action of the inclined surface at the bottom of the outer cavity 43, is conveyed to the fifth-stage cyclone cylinder of the suspension preheater 3 under the action of hot air flow in the second hot air flow pipeline 72, is continuously decomposed under the action of hot air flow in the fifth-stage cyclone cylinder of the suspension preheater 3, and then reaches the rotary kiln 7 from the material outlet of the fifth-stage cyclone cylinder of the suspension preheater 3 to be calcined into cooked material powder.
The hot air flow in the inner cavity of the hollow suspension furnace 4 comprises hot air flow entering the inner cavity through a first hot air flow pipeline 71 of the rotary kiln 7, and the hollow suspension furnace 4 forms hot air flow through fuel combustion; the hot air flow in the fifth stage cyclone of the suspension preheater 3 comprises hot air flow entering the fifth stage cyclone through the second hot air flow pipeline 72 of the rotary kiln 7 and hot air flow entering the fifth stage cyclone through the third hot air flow pipeline 45 of the hollow suspension furnace 3.
Further, the third aspect of the present invention provides a method for preparing industrial powder clinker by using the industrial powder clinker homogeneous calcination preparation device, comprising the steps of raw material grinding, raw material lifting, suspension preheating, decomposition and calcination, wherein the raw material is subjected to suspension preheating in the suspension preheater 3, then carbonate decomposition is performed in the fifth stage cyclone cylinders of the hollow suspension furnace 4 and the suspension preheater 3, the decomposed material is calcined in the rotary kiln 7 to obtain powder clinker, and finally the cooling speed is controlled by the grate cooling dust collector 5, and the powder clinker is classified in a dust removal manner to obtain powder clinker with different fineness.
Compared with the prior art, the invention has the beneficial effects that:
(1) the hollow suspension furnace is used as raw material decomposition equipment, and compared with a conventional decomposition furnace, the hollow suspension furnace can effectively improve the decomposition uniformity, so that the uniformity and the stability of a final product are improved.
(2) The fifth-stage cyclone is also used as a decomposing device, so that the utilization rate of the fifth-stage cyclone can be effectively improved, the decomposing time is prolonged under the same condition, the full decomposition of carbonate is facilitated, and a product with stable activity can be obtained in the calcining step.
(3) The temperature of hot air flow of the rotary kiln is higher than that of the hollow suspension furnace, the hot air flow of the rotary kiln can be fully utilized by improving the structure and the connection mode of the hollow suspension furnace, and the decomposition rate of carbonate reaches more than 95 percent.
(4) The industrialized stable calcination method of the powder clinker is provided by organically combining suspension preheating, hollow suspension decomposition, rotary kiln calcination and grate cooling dust collectors.
Drawings
FIG. 1 is a schematic structural diagram of an industrial powder clinker homogeneous calcination preparation device of the present invention;
FIG. 2 is a schematic view of a preferred hollow suspension furnace according to the present invention;
wherein:
1-grinding machine, 2-lifting machine, 3-suspension preheater, 4-hollow suspension furnace, 5-grate cooling dust collector, 6-bunker, 7-rotary kiln, 71-first hot air pipeline, 72-second hot air pipeline, 41-first pipeline, 42-inner cavity, 43-outer cavity, 44-second pipeline and 45-third hot air pipeline.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, an industrial homogeneous calcination preparation apparatus for powdered clinker comprises a mill 1, wherein the mill 1 is connected with a suspension preheater 3 through a lifter 2, a material outlet of a fifth stage cyclone of the suspension preheater 3 is communicated with a calcination chamber in a rotary kiln 7, a material outlet of a fourth stage cyclone of the suspension preheater 3 is communicated with a hollow suspension furnace 4, a material outlet of the hollow suspension furnace 4 is communicated with the upper part of the fifth stage cyclone of the suspension preheater 3 through a first pipeline 41, a first hot air pipeline 71 of the rotary kiln 7 is connected with the bottom of the hollow suspension furnace 4, a second hot air pipeline 72 of the rotary kiln 7 is connected with the first pipeline 41, and the first pipeline 41 is a bent pipeline; the outlet of the calcining chamber of the rotary kiln 7 is connected with a cold grate dust collector 5; one path of the fuel bin 6 is communicated with a combustion chamber of the rotary kiln 7, the other path is communicated with the hollow suspension furnace 4, the hollow suspension furnace 4 is in an on-line type, and the suspension decomposition of the powder is realized through the hot air flow at the bottom and the fuel combustion.
The industrial powder clinker homogeneous calcining preparation equipment has the following working mode: the mill 1 grinds raw meal, the raw meal is conveyed to the suspension preheater 3 through the lifter 2, the raw meal is conveyed to a first-stage cyclone cylinder of the suspension preheater 3 by a second-stage cyclone cylinder heat flow of the suspension preheater 3, then the raw meal is conveyed to a second-stage cyclone cylinder of the suspension preheater 3 by a third-stage cyclone cylinder heat flow of the suspension preheater 3 from a first-stage cyclone cylinder material outlet of the suspension preheater 3, the raw meal is conveyed to the hollow suspension furnace 4 from a fourth-stage cyclone cylinder material outlet of the suspension preheater 3 for suspension decomposition, then the raw meal is conveyed to a fifth-stage cyclone cylinder of the suspension preheater 3, the decomposition is continued under the heat supply of a hot air flow of the first pipeline 41, then the raw meal reaches the rotary kiln 7 from a material outlet of the fifth-stage cyclone cylinder of the suspension preheater 3 to be calcined into cooked meal powder, finally, the cooling speed is controlled by the grate cooler 5, and the, obtaining the powder clinkers with different fineness.
Example 2
As shown in fig. 1, an industrial homogeneous calcination preparation apparatus for powdered clinker comprises a mill 1, wherein the mill 1 is connected with a suspension preheater 3 through a lifter 2, a material outlet of a fifth stage cyclone of the suspension preheater 3 is communicated with a calcination chamber in a rotary kiln 7, a material outlet of a fourth stage cyclone of the suspension preheater 3 is communicated with a hollow suspension furnace 4, a material outlet of the hollow suspension furnace 4 is communicated with the upper part of the fifth stage cyclone of the suspension preheater 3 through a first pipeline 41, a first hot air pipeline 71 of the rotary kiln 7 is connected with the bottom of the hollow suspension furnace 4, a second hot air pipeline 72 of the rotary kiln 7 is connected with the first pipeline 41, and the first pipeline 41 is a bent pipeline; the outlet of the calcining chamber of the rotary kiln 7 is connected with a cold grate dust collector 5; one path of the fuel bin 6 is communicated with a combustion chamber of the rotary kiln 7, and the other path is communicated with the hollow suspension furnace 4.
Wherein the structure of the hollow suspension furnace 4 is shown in fig. 2 and comprises an inner cavity 42 and an outer cavity 43; the bottom of the inner chamber 42 is conical without a top; the top of the outer cavity 43 is higher than the inner cavity, the bottom of the outer cavity is an inclined plane, and the lowest point of the outer cavity is a material outlet and is connected with the first pipeline 41; the top of the outer cavity 43 is provided with a second pipeline 44 extending into the middle part of the inner cavity and communicated with a material outlet of a fourth-stage cyclone cylinder of the suspension preheater 3; the top of the outer cavity 43 is also provided with a third hot air flow pipeline 45 which is communicated with the upper part of a fifth stage cyclone cylinder of the suspension preheater 3; the first duct 41 is a bent duct, and the first duct 41 communicates with the second hot gas flow duct 72 at the bent point.
The industrial powder clinker homogeneous calcining preparation equipment has the following working mode: mill 1 grinds the raw meal, carries suspension preheater 3 through lifting machine 2, and suspension preheater 3's second level cyclone heat flow carries the raw meal to suspension preheater 3's first order cyclone, then from suspension preheater 3's first order cyclone material outlet, is carried suspension preheater 3's second level cyclone by suspension preheater 3's third level cyclone heat flow, and so on in proper order. The preheated raw meal enters the middle part of the inner cavity 42 of the hollow suspension furnace from the material outlet of the fourth-stage cyclone of the suspension preheater 3 through a second pipeline 44; the preheated raw material is decomposed in a suspension way under the action of hot air flow at the bottom of the inner cavity 42 of the hollow suspension furnace, gradually deposits in the outer cavity 43, reaches the material outlet and the first pipeline 41 under the action of the inclined surface at the bottom of the outer cavity 43, is conveyed to the fifth-stage cyclone cylinder of the suspension preheater 3 under the action of hot air flow in the second hot air flow pipeline 72, is continuously decomposed under the action of hot air flow in the fifth-stage cyclone cylinder of the suspension preheater 3, and then reaches the rotary kiln 7 from the material outlet of the fifth-stage cyclone cylinder of the suspension preheater 3 to be calcined into cooked material powder. And finally, controlling the cooling speed by a grate cooling dust collector 5, and grading the powder clinker in a dust removal mode to obtain the powder clinker with different fineness.
Example 3
The industrial homogeneous calcination method of the CaO powder clinker comprises the following steps: the industrial powder clinker homogeneous calcination preparation equipment used in the embodiment 2 comprises the following steps: grinding limestone into limestone powder with 70-100 meshes, conveying the limestone powder into a suspension preheater 3 by using a chain elevator for suspension preheating, decomposing the limestone powder into CaO powder in fifth-stage cyclones of the hollow suspension furnace 4 and the suspension preheater 3, calcining the CaO powder in a rotary kiln 7 to obtain powder clinker, controlling the cooling speed by using a grate cooler 5, and grading the powder clinker in a dust removal mode to obtain the powder clinker with different fineness. Wherein the temperature of the hollow suspension furnace 4 is controlled to be 900 ℃, the temperature of the rotary kiln 7 is controlled to be 1250 ℃, the fuel adopts coal gas, the grate cooling dust collector 5 controls the air speed by frequency conversion, the temperature is reduced by more than 850 ℃ for 10min, the dust collection fineness is controlled within 5 percent (0.08mm of screen residue), and the calcium oxide powder clinker with the fineness of 3.56 percent is obtained. And (3) sufficiently calcining a small amount of CaO powder at the discharge port of the fifth-stage cyclone of the suspension preheater 3, and calculating the decomposition rate of the CaO powder according to the weight change, wherein the decomposition rate is 98.48 percent by calculation.
Example 4
The industrialized MgO powder clinker homogeneous calcining method comprises the following steps: the industrial powder clinker homogeneous calcination preparation equipment used in the embodiment 2 comprises the following steps: grinding magnesite into magnesite powder of 70-100 meshes, conveying the magnesite powder to a suspension preheater 3 by using a chain type elevator for suspension preheating, then decomposing the magnesite powder into MgO powder in a fifth-stage cyclone cylinder of the hollow suspension furnace 4 and the suspension preheater 3, then calcining the MgO powder in a rotary kiln 7 to obtain powder clinker, finally controlling the cooling speed by a grate cooling dust collector 5, and grading the powder clinker in a dust removal mode to obtain the powder clinker with different fineness. Wherein the temperature of the hollow suspension furnace 4 is controlled to be 800 ℃, the temperature of the rotary kiln 7 is controlled to be 950 ℃, the fuel adopts coal gas, the grate cooling dust collector 5 controls the air speed by frequency conversion, the temperature is reduced to be more than 850 ℃ for 10min, the dust collection fineness is controlled within 5 percent (0.08mm of screen residue), and the calcium oxide powder clinker with the fineness of 3.28 percent is obtained. A small amount of MgO powder at the discharge port of the fifth-stage cyclone of the suspension preheater 3 is taken and fully calcined, and the decomposition rate of the MgO powder is calculated according to the weight change, and is 99.13 percent by calculation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The industrial powder clinker homogeneous calcination preparation equipment is characterized by comprising a mill (1), wherein the mill (1) is connected with a suspension preheater (3) through a lifter (2), a material outlet of a fifth-stage cyclone cylinder of the suspension preheater (3) is communicated with a calcination chamber in a rotary kiln (7), a material outlet of a fourth-stage cyclone cylinder of the suspension preheater (3) is communicated with a hollow suspension furnace (4), a material outlet of the hollow suspension furnace (4) is communicated with the upper part of the fifth-stage cyclone cylinder of the suspension preheater (3) through a first pipeline (41), a first hot air pipeline (71) of the rotary kiln (7) is connected with the bottom of the hollow suspension furnace (4), a second hot air pipeline (72) of the rotary kiln (7) is connected with the first pipeline (41), and the first pipeline (41) is a bent pipeline; the outlet of the calcining chamber of the rotary kiln (7) is connected with a cold dust collector (5); one path of the fuel bin (6) is communicated with a combustion chamber of the rotary kiln (7), the other path is communicated with the hollow suspension furnace (4), the hollow suspension furnace (4) is in a kiln online type, and the suspension decomposition of powder is realized through hot airflow at the bottom and fuel combustion;
the structure of the hollow suspension furnace (4) comprises an inner cavity (42) and an outer cavity (43); the bottom of the inner cavity (42) is conical without a top; the bottom of the inner cavity (42) is connected with a first hot air flow pipeline (71); the top of the outer cavity (43) is higher than the inner cavity, the bottom of the outer cavity is an inclined plane, and the lowest point of the outer cavity is a material outlet and is connected with the first pipeline (41); the top of the outer cavity (43) is provided with a second pipeline (44) extending into the middle part of the inner cavity and communicated with a material outlet of a fourth-stage cyclone cylinder of the suspension preheater (3); the top of the outer cavity (43) is also provided with a third hot air flow pipeline (45) which is communicated with the upper part of a fifth-stage cyclone cylinder of the suspension preheater (3); the first pipeline (41) is a bent pipeline, and the first pipeline (41) is communicated with the second hot air flow pipeline (72) at a bent point.
2. An apparatus as claimed in claim 1, wherein the rotary kiln (7) is a rotary kiln having a diameter of not less than 2.5 m.
3. The equipment as claimed in claim 1, characterized in that the grate cooler dust collector (5) combines a grate cooler with a cloth bag dust removal.
4. The apparatus according to claim 1, characterized in that the fuel in the fuel silo (6) is a gaseous fuel, a liquid fuel or a solid fuel.
5. The apparatus of claim 1, wherein the powder clinker is magnesium oxide or calcium oxide.
6. The apparatus according to claim 1, wherein the temperature of the hollow suspension furnace (4) is 700 ℃ and 1000 ℃, the temperature of the rotary kiln (7) is 900 ℃ and 1500 ℃, and the temperature of the rotary kiln (7) is higher than the temperature of the hollow suspension furnace (4) in the same production process.
7. A homogeneous calcination method for preparing industrial powder clinker by using the equipment of any one of claims 1 to 6, characterized by comprising the steps of grinding raw meal, lifting raw meal, preheating in suspension, decomposing and calcining, wherein the raw meal is preheated in suspension in the suspension preheater (3), then carbonate decomposition is carried out in the fifth stage cyclone cylinders of the hollow suspension furnace (4) and the suspension preheater (3), the decomposed material is calcined in the rotary kiln (7) to obtain powder clinker, finally the cooling speed is controlled by a grate cooler (5), and the powder clinker is classified in a dust removal mode to obtain powder clinker with different fineness.
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