CN211339311U - High-temperature magnesium oxide calcining device - Google Patents
High-temperature magnesium oxide calcining device Download PDFInfo
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- CN211339311U CN211339311U CN201922308165.6U CN201922308165U CN211339311U CN 211339311 U CN211339311 U CN 211339311U CN 201922308165 U CN201922308165 U CN 201922308165U CN 211339311 U CN211339311 U CN 211339311U
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Abstract
A device for calcining magnesium oxide at high temperature belongs to the technical field of magnesium oxide calcination, and comprises a feeder, an air flow dryer, a first-stage cyclone preheater, a second-stage cyclone preheater, a third-stage cyclone preheater, a dust remover, an induced draft fan, a calciner, an automatic gas burner, a heat-preservation tempering furnace, a discharging device, a material collector and a cooling system. The utility model uses magnesite powder or light-burned magnesia powder as raw material, adopts a three-stage cyclone preheater group to complete the preheating treatment of the material, and realizes the drying and preheating process treatment of the material through high temperature calcination and thermal insulation tempering, wherein, the tail gas calcination is a dynamic material current-carrying mass transfer and heat transfer process, and when producing high-quality magnesia, the heat energy is effectively utilized, and the cost is saved; and can realize the production of magnesium oxide products with different quality indexes required by the field of building materials.
Description
Technical Field
The utility model belongs to the technical field of magnesium oxide calcines, in particular to use magnesite powder or light burned magnesium powder to carry out high temperature calcination production magnesium oxide's device as the raw materials.
Background
Magnesium-based cement produced by taking magnesium oxide as a base material is widely applied to building materials, decorative materials, packaging materials and the like, and the application fields are different, so that the physical and chemical performance use requirements of the magnesium oxide as the base material in each field are also different. Magnesite powder or light-burned magnesia powder rich in magnesia is used as a raw material, and magnesia of different quality classes can be produced by adjusting the temperature of a high-temperature calcination process and the heat preservation time of a quenched and tempered material, so that the requirements of application indexes in different fields are met.
The magnesium oxide is calcined at high temperature by using a powder material, and the calcining temperature is close to that of dead burned magnesium, so that the activity of the material is reduced to the maximum extent, and the use index requirement of a new building material can be met. At present, magnesite powder or light-burned magnesium oxide powder is taken as a production raw material to directly carry out high-temperature calcination production, and the equipment and the production method have no forming industrial case, so that the development of an industrial kiln to meet the production requirement of a novel building material becomes another important issue in the industrial field.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a high temperature calcined magnesia device, use magnesite powder or light calcined magnesia powder as raw materials, through high temperature calcination and heat preservation quenching and tempering, wherein, calcine the tail gas in order to realize that the material is dry, preheat the technology and handle, be dynamic material current-carrying mass transfer, heat transfer process, when producing high-quality magnesia, effectively utilize heat energy, practice thrift the cost; the method can realize the production of magnesium oxide products with different quality indexes required by the field of building materials, and the specific technical scheme is as follows:
a device for calcining magnesium oxide at high temperature comprises a feeder 1, an air flow dryer 2, a first-stage cyclone preheater 3, a second-stage cyclone preheater 4, a third-stage cyclone preheater 5, a dust remover 6, an induced draft fan 7, a calciner 8, an automatic gas burner 9, a heat-preservation tempering furnace 10, a discharging device 11, a material collector 12 and a cooling system 13, and is shown in figure 1;
the feeding machine 1 is connected with a side wall feeding port of the airflow dryer 2; an upper air port at the top end of the airflow dryer 2 is connected with a side wall feed inlet of the first-stage cyclone preheater 3 through a pipeline; the lower air port on the side wall of the airflow dryer 2 is connected with the air outlet at the top end of the second-stage cyclone preheater 4 through a pipeline; an air outlet at the top end of the first-stage cyclone preheater 3 is connected with an air inlet at the side wall of the dust remover 6 through a pipeline; an air outlet at the top end of the dust remover 6 is connected with an induced draft fan 7 through a pipeline;
a discharge port at the bottom of the first-stage cyclone preheater 3 is respectively connected with a feed port on the side wall of the second-stage cyclone preheater 4 and an air outlet at the top end of the third-stage cyclone preheater 5 through pipelines; the pipeline of the discharge port at the bottom of the first-stage cyclone preheater 3 is communicated with the discharge port at the bottom of the dust remover 6 through a pipeline;
a discharge hole at the bottom of the third-stage cyclone preheater 5 is connected with a feed hole at the top end of the calcining furnace 8 through a pipeline; the upper part of the side wall of the calcining furnace 8 is connected with an automatic gas burner 9;
a heat-preservation tempering furnace 10 is connected below the calcining furnace 8; a discharging device 11 is arranged below the heat-preservation tempering furnace 10, and a discharging port at the lower end of the discharging device 11 is connected with a cooling system 13 through a pipeline;
the side wall air outlet of the heat-preservation tempering furnace 10 is connected with the side wall air inlet of the material collector 12 through a pipeline; an air outlet at the top end of the material collector 12 is connected with a side wall feed inlet of the third-stage cyclone preheater 5 through a pipeline; the pipeline connecting the material collector 12 and the third-stage cyclone preheater 5 is communicated with the discharge hole at the bottom of the second-stage cyclone preheater 4 through a pipeline;
a scattering device is arranged inside the airflow dryer 2;
the calcining furnace 8 is connected with a combustion flue gas port of the automatic gas burner 9 through a flange;
the calcining furnace 8 is connected with the heat-preservation tempering furnace 10 through a flange;
the cooling system 13 is prior art;
the calcination method of the high-temperature magnesium oxide calcination device comprises the following stages:
stage 1: conveying a magnesite powder or light-burned magnesium oxide powder raw material into an airflow dryer 2 by using a feeder 1, starting a scattering device 13 and a second-stage cyclone preheater 4, and dispersing and drying free moisture of the material under the action of mechanical force of the scattering device 13 and hot air from an air outlet of the second-stage cyclone preheater 4 to form a dried material;
and (2) stage: starting a draught fan 7, carrying a current of a dry material under an airflow zone, entering a primary cyclone preheater 3, performing primary preheating treatment on the material, and performing gas-solid separation; the gas separated by the first-stage cyclone preheater 3 is mixed with a small amount of materials and enters the dust remover 6 from the air outlet at the top end of the first-stage cyclone preheater 3, the materials are dedusted by the dust remover 6, the clean gas enters the induced draft fan 7 through the air outlet at the top end of the dust remover 6, the exhaust gas is exhausted and emptied through the induced draft fan 8, and the small amount of materials are recycled and enter the second-stage cyclone preheater 4 through the discharge hole at the lower end of the dust remover 6; the materials separated by the first-stage cyclone preheater 3 enter the second-stage cyclone preheater 4 through a discharge hole at the lower end of the first-stage cyclone preheater 3, and the materials are subjected to second-stage preheating treatment in the second-stage cyclone preheater 4;
and (3) stage: discharging the material subjected to the second-stage preheating treatment from a discharge port at the lower end of the second-stage cyclone preheater 4, allowing the material to enter a third-stage cyclone preheater 5 through a pipeline, performing third-stage preheating treatment, and performing gas-solid separation; the hot gas separated by the third-stage cyclone preheater 5 circularly enters the second-stage cyclone preheater 4 through an air outlet at the top end of the third-stage cyclone preheater 5, and the hot gas is preheated and carries current for the material which enters the second-stage cyclone preheater 4 after gas-solid separation by the first-stage cyclone preheater 3; the materials separated by the third-stage cyclone preheater 5 enter the calciner 8 through a discharge port at the lower end of the third-stage cyclone preheater 5, and meanwhile, the automatic gas burner 9 is started to atomize and heat the materials under the action of combustion hot flue gas, and the calcination decomposition treatment of the materials is completed in the process of carrying flow operation in the calciner 8, so as to form the calcined materials;
and (4) stage: the calcined material falls into a heat-preservation tempering furnace 10 according to the gravity, and the heat preservation, homogenization and tempering are carried out on the material, wherein the heat required by the heat preservation tempering of the material comes from material calcining gas entering the heat-preservation tempering furnace 10 from a calcining furnace 8 and radiation heat generated by gas combustion of an automatic gas burner 9; discharging the heat-insulated, homogenized and tempered material from a discharge port at the lower end of a heat-insulated tempering furnace 10 into a discharging device 11;
and (5) stage: the heat preservation tempering furnace 10 discharges gas and carries a small amount of materials, the gas and the materials enter the material collector 12 through a pipeline on the side wall of the heat preservation tempering furnace 10, and gas-solid separation is carried out in the material collector 12; wherein, a small amount of materials separated by the material collector 12 are returned into the thermal insulation tempering furnace 10 from a discharge hole at the lower end of the material collector 12; the gas separated by the material collector 12 enters the third-stage cyclone preheater 5 from the air outlet at the top end of the material collector 12 to provide carrier gas and required heat for the third-stage preheating treatment in the stage 3 and the drying material in the stage 1; the heat energy realizes cyclic calcination utilization;
and 6: the material in the discharging device 11 enters a cooling system 13 through a pipeline for cooling treatment to obtain a magnesium oxide product;
the drying temperature of the materials in the airflow dryer 2 is 450-1000 ℃;
the preheating temperature of the materials in the first-stage cyclone preheater 3 is 350-900 ℃;
the preheating temperature of the materials in the second-stage cyclone preheater 4 is 500-1250 ℃;
the preheating temperature of the materials in the third-stage cyclone preheater 5 is 600-1350 ℃;
the calcining temperature of the material in the calcining furnace 8 is 1000-1750 ℃;
the heat preservation and tempering temperature of the material in the heat preservation and tempering furnace 10 is 800-1550 ℃, and the material tempering retention time is 30-120 minutes;
the temperature of the magnesium oxide product cooled by the cooling system is 70-80 ℃;
the magnesium oxide product particles are smaller than 150 meshes.
The utility model discloses a high temperature is calcined and is calcined magnesium oxide device, compared with the prior art, beneficial effect is:
the utility model relates to a novel kiln for calcining powdery materials (magnesite powder or light-burned magnesia powder) and producing magnesia by calcining the powder at high temperature. The material is atomized and heated under the action of combustion gas, and the calcination decomposition process treatment of the material is completed in the current-carrying operation process of the calcination gas, so that the material atomized and dispersed has large specific surface area, is fully heated in the calcination process, and has high heat transfer rate and uniform calcination treatment.
Second, the utility model discloses a thermal-insulation tempering furnace can set up thermal-insulation tempering technological parameter according to material rerum natura and product application performance index requirement, can produce the required multiple standard specification magnesium oxide of building material to satisfy building material market demand.
Thirdly, the utility model discloses be provided with air flow dryer to the inside device that breaks up that is provided with of air flow dryer is favorable to powdery material dispersion and material drying process in the current-carrying gas.
Fourthly, the utility model discloses a tertiary cyclone preheater group accomplishes the preheating of material, and the thermal cyclic utilization is all got from the material calcination to the required heat of material drying and preheating and the thermal cyclic utilization of exhaust tail gas behind the quenching and tempering technology. The heat utilization efficiency of the calcining furnace system can be improved to the maximum extent, so that the purposes of energy conservation and high efficiency of the device are achieved.
Fifthly, the utility model discloses the material after the quenching and tempering stove that keeps warm carries out airtight cooling treatment, and its purpose can guarantee product quality for stable product nature to avoid high temperature material and humid air contact and the matter that takes place to become.
Drawings
Fig. 1 is a schematic view of the device for calcining magnesium oxide at high temperature of the utility model: the method comprises the following steps of 1-feeding machine, 2-airflow dryer, 3-first stage cyclone preheater, 4-second stage cyclone preheater, 5-third stage cyclone preheater, 6-dust remover, 7-induced draft fan, 8-calcining furnace, 9-automatic gas burner, 10-heat preservation tempering furnace, 11-discharging device, 12-material collector and 13-cooling system.
Detailed Description
The present invention will be further described with reference to the following specific embodiments, but the present invention is not limited to these embodiments.
Example 1
A device for calcining magnesium oxide at high temperature comprises a feeder 1, an air flow dryer 2, a first-stage cyclone preheater 3, a second-stage cyclone preheater 4, a third-stage cyclone preheater 5, a dust remover 6, an induced draft fan 7, a calciner 8, an automatic gas burner 9, a heat-preservation tempering furnace 10, a discharging device 11, a material collector 12 and a cooling system 13, and is shown in figure 1;
the feeding machine 1 is connected with a side wall feeding port of the airflow dryer 2; an upper air port at the top end of the airflow dryer 2 is connected with a side wall feed inlet of the first-stage cyclone preheater 3 through a pipeline; the lower air port on the side wall of the airflow dryer 2 is connected with the air outlet at the top end of the second-stage cyclone preheater 4 through a pipeline; an air outlet at the top end of the first-stage cyclone preheater 3 is connected with an air inlet at the side wall of the dust remover 6 through a pipeline; an air outlet at the top end of the dust remover 6 is connected with an induced draft fan 7 through a pipeline;
a discharge port at the bottom of the first-stage cyclone preheater 3 is respectively connected with a feed port on the side wall of the second-stage cyclone preheater 4 and an air outlet at the top end of the third-stage cyclone preheater 5 through pipelines; the pipeline of the discharge port at the bottom of the first-stage cyclone preheater 3 is communicated with the discharge port at the bottom of the dust remover 6 through a pipeline;
a discharge hole at the bottom of the third-stage cyclone preheater 5 is connected with a feed hole at the top end of the calcining furnace 8 through a pipeline; the upper part of the side wall of the calcining furnace 8 is connected with an automatic gas burner 9;
a heat-preservation tempering furnace 10 is connected below the calcining furnace 8; a discharging device 11 is arranged below the heat-preservation tempering furnace 10, and a discharging port at the lower end of the discharging device 11 is connected with a cooling system 13 through a pipeline;
the side wall air outlet of the heat-preservation tempering furnace 10 is connected with the side wall air inlet of the material collector 12 through a pipeline; an air outlet at the top end of the material collector 12 is connected with a side wall feed inlet of the third-stage cyclone preheater 5 through a pipeline; the pipeline connecting the material collector 12 and the third-stage cyclone preheater 5 is communicated with the discharge hole at the bottom of the second-stage cyclone preheater 4 through a pipeline;
a scattering device is arranged inside the airflow dryer 2;
the calcining furnace 8 is connected with a combustion flue gas port of the automatic gas burner 9 through a flange;
the calcining furnace 8 is connected with the heat-preservation tempering furnace 10 through a flange;
the cooling system 13 is prior art;
the calcination method of the high-temperature magnesium oxide calcination device comprises the following stages:
the raw material processed by the pilot plant production line is magnesite powder, the particle of the magnesite powder is 180 meshes, the water content is 8 percent, the MgO content is 40.5 percent, the pilot plant production capacity is 500kg of over-burnt magnesia per hour, and the fuel is natural gas (8500 kcal/Nm)3)。
Stage 1: conveying a magnesite powder or light-burned magnesium oxide powder raw material into an airflow dryer 2 by using a feeder 1, starting a scattering device 13 and a second-stage cyclone preheater 4, and dispersing and drying free moisture of the material under the action of mechanical force of the scattering device 13 and hot air from an air outlet of the second-stage cyclone preheater 4 to form a dried material;
and (2) stage: starting a draught fan 7, carrying a current of a dry material under an airflow zone, entering a primary cyclone preheater 3, performing primary preheating treatment on the material, and performing gas-solid separation; the gas separated by the first-stage cyclone preheater 3 is mixed with a small amount of materials and enters the dust remover 6 from the air outlet at the top end of the first-stage cyclone preheater 3, the materials are dedusted by the dust remover 6, the clean gas enters the induced draft fan 7 through the air outlet at the top end of the dust remover 6, the exhaust gas is exhausted and emptied through the induced draft fan 8, and the small amount of materials are recycled and enter the second-stage cyclone preheater 4 through the discharge hole at the lower end of the dust remover 6; the materials separated by the first-stage cyclone preheater 3 enter the second-stage cyclone preheater 4 through a discharge hole at the lower end of the first-stage cyclone preheater 3, and the materials are subjected to second-stage preheating treatment in the second-stage cyclone preheater 4;
and (3) stage: discharging the material subjected to the second-stage preheating treatment from a discharge port at the lower end of the second-stage cyclone preheater 4, allowing the material to enter a third-stage cyclone preheater 5 through a pipeline, performing third-stage preheating treatment, and performing gas-solid separation; the hot gas separated by the third-stage cyclone preheater 5 circularly enters the second-stage cyclone preheater 4 through an air outlet at the top end of the third-stage cyclone preheater 5, and the hot gas is preheated and carries current for the material which enters the second-stage cyclone preheater 4 after gas-solid separation by the first-stage cyclone preheater 3; the materials separated by the third-stage cyclone preheater 5 enter the calciner 8 through a discharge port at the lower end of the third-stage cyclone preheater 5, and meanwhile, the automatic gas burner 9 is started to atomize and heat the materials under the action of combustion hot flue gas, and the calcination decomposition treatment of the materials is completed in the process of carrying flow operation in the calciner 8, so as to form the calcined materials;
and (4) stage: the calcined material falls into a heat-preservation tempering furnace 10 according to the gravity, and the heat preservation, homogenization and tempering are carried out on the material, wherein the heat required by the heat preservation tempering of the material comes from material calcining gas entering the heat-preservation tempering furnace 10 from a calcining furnace 8 and radiation heat generated by gas combustion of an automatic gas burner 9; discharging the heat-insulated, homogenized and tempered material from a discharge port at the lower end of a heat-insulated tempering furnace 10 into a discharging device 11;
and (5) stage: the heat preservation tempering furnace 10 discharges gas and carries a small amount of materials, the gas and the materials enter the material collector 12 through a pipeline on the side wall of the heat preservation tempering furnace 10, and gas-solid separation is carried out in the material collector 12; wherein, a small amount of materials separated by the material collector 12 are returned into the thermal insulation tempering furnace 10 from a discharge hole at the lower end of the material collector 12; the gas separated by the material collector 12 enters the third-stage cyclone preheater 5 from the air outlet at the top end of the material collector 12 to provide carrier gas and required heat for the third-stage preheating treatment in the stage 3 and the drying material in the stage 1; the heat energy realizes cyclic calcination utilization;
and 6: the material in the discharging device 11 enters a cooling system 13 through a pipeline for cooling treatment to obtain a magnesium oxide product;
the drying temperature of the materials in the pneumatic dryer 2 is 750 ℃;
the preheating temperature of the materials in the first-stage cyclone preheater 3 is 550 ℃;
the preheating temperature of the materials in the second-stage cyclone preheater 4 is 850 ℃;
the preheating temperature of the materials in the third-stage cyclone preheater 5 is 950 ℃;
the calcining temperature of the materials in the calcining furnace 8 is 1300 +/-30 ℃;
the heat preservation and tempering temperature of the material in the heat preservation and tempering furnace 10 is 1100 +/-30 ℃, and the material tempering retention time is 2 hours;
the temperature of the magnesium oxide product cooled by the cooling system is 80 ℃.
Oxygen produced by calcination in this exampleThe indexes of the magnesium oxide product are as follows: the content of magnesium oxide is 81 percent, the activity is 3 percent, the ignition loss is less than or equal to 1 percent, and the density is 3.2g/cm3The particle size is 180 meshes.
Example 2
A device for calcining magnesium oxide at high temperature comprises a feeder 1, an air flow dryer 2, a first-stage cyclone preheater 3, a second-stage cyclone preheater 4, a third-stage cyclone preheater 5, a dust remover 6, an induced draft fan 7, a calciner 8, an automatic gas burner 9, a heat-preservation tempering furnace 10, a discharging device 11, a material collector 12 and a cooling system 13, and is shown in figure 1;
the feeding machine 1 is connected with a side wall feeding port of the airflow dryer 2; an upper air port at the top end of the airflow dryer 2 is connected with a side wall feed inlet of the first-stage cyclone preheater 3 through a pipeline; the lower air port on the side wall of the airflow dryer 2 is connected with the air outlet at the top end of the second-stage cyclone preheater 4 through a pipeline; an air outlet at the top end of the first-stage cyclone preheater 3 is connected with an air inlet at the side wall of the dust remover 6 through a pipeline; an air outlet at the top end of the dust remover 6 is connected with an induced draft fan 7 through a pipeline;
a discharge port at the bottom of the first-stage cyclone preheater 3 is respectively connected with a feed port on the side wall of the second-stage cyclone preheater 4 and an air outlet at the top end of the third-stage cyclone preheater 5 through pipelines; the pipeline of the discharge port at the bottom of the first-stage cyclone preheater 3 is communicated with the discharge port at the bottom of the dust remover 6 through a pipeline;
a discharge hole at the bottom of the third-stage cyclone preheater 5 is connected with a feed hole at the top end of the calcining furnace 8 through a pipeline; the upper part of the side wall of the calcining furnace 8 is connected with an automatic gas burner 9;
a heat-preservation tempering furnace 10 is connected below the calcining furnace 8; a discharging device 11 is arranged below the heat-preservation tempering furnace 10, and a discharging port at the lower end of the discharging device 11 is connected with a cooling system 13 through a pipeline;
the side wall air outlet of the heat-preservation tempering furnace 10 is connected with the side wall air inlet of the material collector 12 through a pipeline; an air outlet at the top end of the material collector 12 is connected with a side wall feed inlet of the third-stage cyclone preheater 5 through a pipeline; the pipeline connecting the material collector 12 and the third-stage cyclone preheater 5 is communicated with the discharge hole at the bottom of the second-stage cyclone preheater 4 through a pipeline;
a scattering device is arranged inside the airflow dryer 2;
the calcining furnace 8 is connected with a combustion flue gas port of the automatic gas burner 9 through a flange;
the calcining furnace 8 is connected with the heat-preservation tempering furnace 10 through a flange;
the cooling system 13 is of the prior art;
the calcination method of the high-temperature magnesium oxide calcination device comprises the following stages:
the pilot production line has the processing raw material of light-burned magnesia powder with the grain size of 180 meshes, the water content of 8 percent and the MgO content of 40.5 percent, the pilot production capacity of 500kg of over-burned magnesia per hour, and the fuel of natural gas (8500 kcal/Nm/hr)3)；
Stage 1: conveying a magnesite powder or light-burned magnesium oxide powder raw material into an airflow dryer 2 by using a feeder 1, starting a scattering device 13 and a second-stage cyclone preheater 4, and dispersing and drying free moisture of the material under the action of mechanical force of the scattering device 13 and hot air from an air outlet of the second-stage cyclone preheater 4 to form a dried material;
and (2) stage: starting a draught fan 7, carrying a current of a dry material under an airflow zone, entering a primary cyclone preheater 3, performing primary preheating treatment on the material, and performing gas-solid separation; the gas separated by the first-stage cyclone preheater 3 is mixed with a small amount of materials and enters the dust remover 6 from the air outlet at the top end of the first-stage cyclone preheater 3, the materials are dedusted by the dust remover 6, the clean gas enters the induced draft fan 7 through the air outlet at the top end of the dust remover 6, the exhaust gas is exhausted and emptied through the induced draft fan 8, and the small amount of materials are recycled and enter the second-stage cyclone preheater 4 through the discharge hole at the lower end of the dust remover 6; the materials separated by the first-stage cyclone preheater 3 enter the second-stage cyclone preheater 4 through a discharge hole at the lower end of the first-stage cyclone preheater 3, and the materials are subjected to second-stage preheating treatment in the second-stage cyclone preheater 4;
and (3) stage: discharging the material subjected to the second-stage preheating treatment from a discharge port at the lower end of the second-stage cyclone preheater 4, allowing the material to enter a third-stage cyclone preheater 5 through a pipeline, performing third-stage preheating treatment, and performing gas-solid separation; the hot gas separated by the third-stage cyclone preheater 5 circularly enters the second-stage cyclone preheater 4 through an air outlet at the top end of the third-stage cyclone preheater 5, and the hot gas is preheated and carries current for the material which enters the second-stage cyclone preheater 4 after gas-solid separation by the first-stage cyclone preheater 3; the materials separated by the third-stage cyclone preheater 5 enter the calciner 8 through a discharge port at the lower end of the third-stage cyclone preheater 5, and meanwhile, the automatic gas burner 9 is started to atomize and heat the materials under the action of combustion hot flue gas, and the calcination decomposition treatment of the materials is completed in the process of carrying flow operation in the calciner 8, so as to form the calcined materials;
and (4) stage: the calcined material falls into a heat-preservation tempering furnace 10 according to the gravity, and the heat preservation, homogenization and tempering are carried out on the material, wherein the heat required by the heat preservation tempering of the material comes from material calcining gas entering the heat-preservation tempering furnace 10 from a calcining furnace 8 and radiation heat generated by gas combustion of an automatic gas burner 9; discharging the heat-insulated, homogenized and tempered material from a discharge port at the lower end of a heat-insulated tempering furnace 10 into a discharging device 11;
and (5) stage: the heat preservation tempering furnace 10 discharges gas and carries a small amount of materials, the gas and the materials enter the material collector 12 through a pipeline on the side wall of the heat preservation tempering furnace 10, and gas-solid separation is carried out in the material collector 12; wherein, a small amount of materials separated by the material collector 12 are returned into the thermal insulation tempering furnace 10 from a discharge hole at the lower end of the material collector 12; the gas separated by the material collector 12 enters the third-stage cyclone preheater 5 from the air outlet at the top end of the material collector 12 to provide carrier gas and required heat for the third-stage preheating treatment in the stage 3 and the drying material in the stage 1; the heat energy realizes cyclic calcination utilization;
and 6: the material in the discharging device 11 enters a cooling system 13 through a pipeline for cooling treatment to obtain a magnesium oxide product;
the drying temperature of the materials in the pneumatic dryer 2 is 850 ℃;
the preheating temperature of the materials in the first-stage cyclone preheater 3 is 750 ℃;
the preheating temperature of the materials in the second-stage cyclone preheater 4 is 1150 ℃;
the preheating temperature of the materials in the third-stage cyclone preheater 5 is 1250 ℃;
the calcining temperature of the materials in the calcining furnace 8 is 1600 plus or minus 30 ℃;
the heat preservation and tempering temperature of the material in the heat preservation and tempering furnace 10 is 1400 +/-30 ℃, and the material tempering retention time is 2 hours;
the temperature of the magnesium oxide product cooled by the cooling system is 80 ℃;
the indexes of the magnesium oxide product produced by calcination in this example are: the content of magnesium oxide is 81 percent, the activity is 0 percent, the ignition loss is less than or equal to 0.5 percent, and the density is 3.2g/cm3The particle size is 180 meshes.
Claims (3)
1. The high-temperature magnesium oxide calcining device is characterized by comprising a feeding machine (1), an airflow dryer (2), a first-stage cyclone preheater (3), a second-stage cyclone preheater (4), a third-stage cyclone preheater (5), a dust remover (6), an induced draft fan (7), a calcining furnace (8), an automatic gas burner (9), a heat-preservation tempering furnace (10), a discharging device (11), a material collector (12) and a cooling system (13);
the feeding machine (1) is connected with a side wall feeding port of the airflow dryer (2); an upper air inlet at the top end of the airflow dryer (2) is connected with a side wall feed inlet of the first-stage cyclone preheater (3) through a pipeline; a lower air inlet on the side wall of the airflow dryer (2) is connected with an air outlet at the top end of the second-stage cyclone preheater (4) through a pipeline; an air outlet at the top end of the first-stage cyclone preheater (3) is connected with an air inlet at the side wall of the dust remover (6) through a pipeline; an air outlet at the top end of the dust remover (6) is connected with an induced draft fan (7) through a pipeline;
a discharge port at the bottom of the first-stage cyclone preheater (3) is respectively connected with a feed port on the side wall of the second-stage cyclone preheater (4) and an air outlet at the top end of the third-stage cyclone preheater (5) through pipelines; the pipeline of the discharge port at the bottom of the first-stage cyclone preheater (3) is communicated with the discharge port at the bottom of the dust remover (6) through a pipeline;
a discharge port at the bottom of the third-stage cyclone preheater (5) is connected with a feed port at the top end of the calciner (8) through a pipeline; the upper part of the side wall of the calcining furnace (8) is connected with an automatic gas burner (9);
a heat-preservation tempering furnace (10) is connected below the calcining furnace (8); a discharging device (11) is arranged below the heat-preservation tempering furnace (10), and a discharging port at the lower end of the discharging device (11) is connected with a cooling system (13) through a pipeline;
the side wall air outlet of the heat-preservation tempering furnace (10) is connected with the side wall air inlet of the material collector (12) through a pipeline; an air outlet at the top end of the material collector (12) is connected with a side wall feed inlet of the third-stage cyclone preheater (5) through a pipeline; and a pipeline connected with the material collector (12) and the third-stage cyclone preheater (5) is communicated with a discharge port at the bottom of the second-stage cyclone preheater (4) through a pipeline.
2. A high temperature calcined magnesia according to claim 1, characterized in that the inside of the air dryer (2) is provided with a breaking-up device.
3. A high temperature calcined magnesia according to claim 1, characterized in that the calciner (8) is flanged to the combustion flue gas port of an automatic gas burner (9); the calcining furnace (8) is connected with the heat-preservation tempering furnace (10) through a flange.
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