CN102515231A - Apparatus and method for production of high temperature alumina with circulating fluidized bed roasting furnace - Google Patents
Apparatus and method for production of high temperature alumina with circulating fluidized bed roasting furnace Download PDFInfo
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Abstract
The invention provides an apparatus and a method for production of high temperature alumina with a circulating fluidized bed roasting furnace, which belongs to the technical field of chemical engineering. The apparatus comprises a Venturi flash dryer, a dust collector, a pneumatic elevator pump, a primary cyclone separator, a first-grade preheating cyclone separator, a second-grade preheating cyclone separator, a third-grade preheating cyclone separator, a circulating fluidized bed roasting furnace, a high temperature cyclone separator and a cooling system. The method comprises the following steps: conveying an aluminum hydroxide raw material to the Venturi flash dryer, then to the dust collector and then to the primary cyclone separator; allowing the aluminum hydroxide raw material to be sequentially conveyed to the first-grade preheating cyclone separator, the second-grade preheating cyclone separator and the third-grade preheating cyclone separator for preheating and gas-solid separation and finally allowing the aluminum hydroxide raw material to be conveyed to the circulating fluidized bed roasting furnace for roasting and to be converted into alpha alumina at high temperature. The apparatus and the method provided in the invention enable the heated material to be suspended in air flow, heat exchange to be drastically carried out, temperature distribution of the material to be more uniform, heat consumption to be reduced and roasting to be more uniform.
Description
Technical field
The invention belongs to chemical technology field, particularly a kind of device and method of circulating fluidized bed stoving oven production high temperature alumina.
Background technology
High temperature alumina is to be main raw material with the commercial alumina hydrate, is transformed through roasting dehydration, crystalline phase.The high temperature alumina outward appearance is white powder or fine sand shape, and mobile better stable performance is insoluble in the acid-base solution, is the ceramic of a kind of of many uses, excellent performance, price economy.Along with the swift and violent emergence of high-tech industry, the Application Areas of high temperature alumina has also obtained rapid expansion.High temperature alumina has fusing point height (2040 ℃), unreactiveness is strong and be used for refractory materials, refractory castable etc.; Have high-temp and high-strength, excellent electrical insulating property etc. and as the starting material of ceramics such as automobile spark plug, electronic substrates, cutter; Have characteristics such as good thermostability, high firmness, wear resistance are good and be mainly used in the raw materials for production of grinding, attrition resistant engineering machinery part and high alumina ceramic.Statistics shows that the market capacity that high temperature alumina is used for the non-metallurgy industry of ceramic material, wear-resistant material etc. accounts for about 25% of extraordinary aluminum oxide total amount, and application prospect is boundless.
It generally is that the white lake raw material is carried out roasting again through after the cooling cylinder cooling at a certain temperature through rotary kiln that high temperature alumina is produced, and obtains high temperature alumina, and rotary kiln belongs to the revolving drum kind equipment.Firebrick lining and heat-exchanger rig are arranged in the cylindrical shell, and with the low speed revolution, material and hot flue gas are generally countercurrent flow, and material added from high-end (the claiming cold junction or kiln tail end again) of kiln.Because cylindrical shell tilts to install, material is moving when circumferentially rolling vertically in the kiln when revolution, and burner sprays into fuel at low side (claiming hot junction or kiln hood end again), and flue gas is discharged by tail end; Material obtains heating in moving process, process physics and chemical transformation become specification product and draw off from low side.
Traditional way as the production high temperature alumina; Rotary kiln takes up an area of all relatively large in investment and construction; Hear rate is high; The defective of aspects such as maintenance cost is big, exhaust pollutant composition height no longer adapts to requirement energy-conservation under the new situation, that reduce discharging, lower consumption, thereby has restricted the development of high temperature alumina industry.
Summary of the invention
Go up the problem that exists to existing high temperature alumina preparation, the present invention provides a kind of device and method of circulating fluidized bed stoving oven production high temperature alumina.
The device of circulating fluidized bed stoving oven production high temperature alumina of the present invention comprises Venturi flash dryer, dust-precipitator, air lift mud pump, elementary cyclonic separator, 1 grade of preheating cyclonic separator, 2 grades of preheating cyclonic separators, 3 grades of preheating cyclonic separators, circulating fluidized bed stoving oven, high temperature cyclone separator and cooling systems; The top discharge mouth of Venturi flash dryer is communicated with the opening for feed of dust-precipitator; The discharge port of dust-precipitator is communicated with the opening for feed of air lift mud pump; The top discharge mouth of air lift mud pump is communicated with the opening for feed of elementary cyclonic separator; The discharge port of elementary cyclonic separator is communicated with the opening for feed of 1 grade of preheating cyclonic separator, and the discharge port of 1 grade of preheating cyclonic separator is communicated with the opening for feed of 2 grades of preheating cyclonic separators, and the discharge port of 2 grades of preheating cyclonic separators is communicated with the opening for feed of 3 grades of preheating cyclonic separators; The discharge port of 3 grades of preheating cyclonic separators is communicated with the last opening for feed of circulating fluidized bed stoving oven; The discharge port of circulating fluidized bed stoving oven is communicated with the opening for feed of high temperature cyclone separator, and the sidepiece of circulating fluidized bed stoving oven is provided with first inlet mouth, and the bottom is provided with second inlet mouth; The high temperature cyclone separator bottom is provided with U type material returning device, and the returning charge leg of U type material returning device is communicated with the recycle feed mouth of circulating fluidized bed stoving oven, and the sealing leg of U type material returning device is communicated with cooling system.
In the said apparatus; The air outlet of elementary cyclonic separator is communicated with first inlet mouth of circulating fluidized bed stoving oven; The air outlet of 1 grade of preheating cyclonic separator is communicated with the inlet mouth of Venturi flash dryer; The air outlet of 2 grades of preheating cyclonic separators is communicated with the opening for feed of 1 grade of preheating cyclonic separator, and the air outlet of 3 grades of preheating cyclonic separators is communicated with the opening for feed of 2 grades of preheating cyclonic separators.
In the said apparatus, the opening for feed of Venturi flash dryer connects the outlet of screw feeder, and the import of screw feeder connects feed bin.
In the said apparatus, cooling system comprises 1 grade of cooling cyclonic separator, 2 grades of cooling cyclonic separators, 3 grades of cooling cyclonic separators, 4 grades of cooling cyclonic separators, 1 grade of fluidizing cooler and 2 grades of fluidizing coolers; The opening for feed of 1 grade of cooling cyclonic separator is communicated with the discharge port of high temperature cyclone separator; The discharge port of 1 grade of cooling cyclonic separator is communicated with the opening for feed of 2 grades of cooling cyclonic separators; The discharge port of 2 grades of cooling cyclonic separators is communicated with the opening for feed of 3 grades of cooling cyclonic separators; The discharge port of 3 grades of condensing surface cyclonic separators is communicated with the opening for feed of 4 grades of cooling cyclonic separators; The discharge port of 4 grades of cooling cyclonic separators is communicated with the opening for feed of 1 grade of fluidizing cooler, and the discharge port of 1 grade of fluidizing cooler is communicated with the opening for feed of 2 grades of fluidizing coolers.
In the said apparatus; The air outlet of 1 grade of cooling cyclonic separator is communicated with first inlet mouth of circulating fluidized bed stoving oven; The air outlet of 2 grades of cooling cyclonic separators is communicated with the opening for feed of 1 grade of cooling cyclonic separator; The air outlet of 3 grades of cooling cyclonic separators is communicated with the opening for feed of 2 grades of cooling cyclonic separators, and the air outlet of 4 grades of cooling cyclonic separators is communicated with the opening for feed of 3 grades of cooling cyclonic separators.
In the said apparatus; 1 grade of fluidizing cooler is provided with fluidized wind blast inlet, fluidized wind air outlet, air-cooled pipeline blast inlet and air-cooled pipeline air outlet; The fluidized wind air outlet of 1 grade of fluidizing cooler is communicated with the blast inlet of 4 grades of cooling cyclonic separators, and the air-cooled pipeline air outlet of 1 grade of fluidizing cooler is communicated with second blast inlet of circulating fluidized bed stoving oven; 2 grades of fluidizing coolers are provided with water-in, water outlet, fluidized wind air outlet and fluidized wind blast inlet, and the fluidized wind air outlet of 2 grades of fluidizing coolers is communicated with the blast inlet of 4 grades of cooling cyclonic separators.
The method of work of the device of circulating fluidized bed stoving oven production high temperature alumina of the present invention is:
The white lake raw material that 1, will contain attached water places feed bin, is transferred in the Venturi flash dryer again, and the hot gas that transmits through 1 grade of preheating cyclonic separator carries out drying, forms water vapour and Aluminium Hydroxide; The hot gas flow velocity is 30 ~ 40m/s; The weight content of attached water is 5 ~ 8% in the white lake raw material;
2, Aluminium Hydroxide and water vapour carry out gas solid separation from the discharge port entering dust-precipitator of Venturi flash dryer, and the solid Aluminium Hydroxide is transferred to through air lift mud pump and carries out gas solid separation in the elementary cyclonic separator;
3, the isolated solid of elementary cyclonic separator is transferred to successively in 1 grade of preheating separator, 2 grades of preheating separators and 3 grades of preheating separators and is carried out preheating and gas solid separation; Be transferred at last in the circulating fluidized bed stoving oven; Feed warm air makes material be in fluidized state and carries out roasting from circulating fluidized bed stoving oven bottom; Material gets in the high temperature cyclone separator in company with air-flow and carries out the high temperature gas solid separation in the roasting process; Solid materials after the separation turns back to roasting once more in the circulating fluidized bed stoving oven through the returning charge leg of U type material returning device; Solid materials through after at least 5 circulations, is discharged the entering cooling system from the sealing leg of U type material returning device in circulating fluidized bed stoving oven and high temperature cyclone separator; White lake removes a water molecules and forms gamma-alumina in this process, becomes αYang Hualv through pyrolytic conversion again.
In the aforesaid method, the isolated gas of elementary cyclonic separator gets into the circulating fluidized bed stoving oven; 1 grade of isolated gas of preheating cyclonic separator gets into the Venturi flash dryer; 2 grades of isolated gases of preheating cyclonic separator get into 1 grade of preheating cyclonic separator; 3 grades of 2 grades of preheating cyclonic separators of gas entering that the preheating separator separates goes out; The isolated gas of high temperature cyclone separator gets into 3 grades of preheating cyclonic separators.
In the aforesaid method, get into 1 grade of cooling cyclonic separator, 2 grades of cooling cyclonic separators, 3 grades of cooling cyclonic separators and 4 grades of cooling cyclonic separators successively from the isolated solid materials of high temperature cyclone separator and cool off and gas solid separation; In 1 grade of fluidizing cooler, feed fluidization air, and in the air cooling pipeline of 1 grade of fluidizing cooler bubbling air; In the cooling water pipeline of 2 grades of fluidizing coolers, feed water, and feed fluidization air to 2 grades of fluidizing coolers; 4 grades of isolated cooling solid materials of cooling cyclonic separator get into 1 grade of fluidizing cooler; Under the fluidized wind effect, be fluidized state and carry out air cooling; Get into 2 grades of fluidizing coolers then, discharge after be lower than 80 ℃ through water-cooled being fluidized state under the fluidization air effect.
In the aforesaid method; Get into the circulating fluidized bed stoving oven from 1 grade of isolated gas of cooling cyclonic separator; Get into the opening for feed of 1 grade of cooling cyclonic separator from 2 grades of isolated gases of cooling cyclonic separator; Get into the opening for feed of 3 grades of cooling cyclonic separators from 3 grades of isolated gases of cyclonic separator, get into the opening for feed of 3 grades of cooling cyclonic separators from 4 grades of isolated gases of cooling cyclonic separator, bubbling air cools off in 4 grades of cooling cyclonic separators simultaneously.
In the aforesaid method, the fluidization air of from 1 grade of fluidizing cooler, discharging gets into 4 grades of cooling cyclonic separators, the air admission circulating fluidized bed stoving oven after interior being heated of discharging of the cooling duct of 1 grade of fluidizing cooler; 2 grades of 4 grades of cooling cyclonic separators of fluidizing agent entering that fluidizing cooler is discharged.
In the aforesaid method, the temperature when circulating fluidized bed stoving oven and high temperature cyclone separator circulate roasting is 1400 ± 50 ℃, and the residence time of solid materials in circulating fluidized bed stoving oven and high temperature cyclone separator is 20 ~ 30s; Temperature when 1 grade of preheating cyclonic separator, 2 grades of preheating cyclonic separators and 3 grades of preheating cyclonic separator separation of material is followed successively by 340 ± 10 ℃, 630 ± 50 ℃ and 1100 ± 50 ℃, and the temperature of Aluminium Hydroxide is controlled at 145 ± 10 ℃.
In the aforesaid method, the temperature when 1 grade of cooling cyclonic separator, 2 grades of cooling cyclonic separators, 3 grades of cooling cyclonic separators and 4 grades of cooling cyclonic separators cool off material is followed successively by 1320 ± 50 ℃, 1210 ± 50 ℃, 1050 ± 50 ℃ and 990 ± 50 ℃; 2 grades of fluidizing cooler drop temperatures are less than 80 ℃.
In the aforesaid method, weight content >=95% of αYang Hualv from the isolated solid materials of high temperature cyclone separator.
Device of the present invention adopts the method for fluosolids roasting; The material of heating is suspended in air-flow; The surface-area that hot gas flow contacts with particle increases greatly; The particulate all surface can obtain heating simultaneously, and heat exchanging process can acutely carry out, and the material of suspension just can obtain heating in a short period of time; Because the disturbance of material and air-flow is strong, material temperature distributes also more even simultaneously; Thereby with traditional technology mutually specific fuel consumption reduce more than 30%, roasting is more even; This device and method is compared the investment that needs with conventional art can save 15 ~ 20%, takes up an area of to be 1/5th of rotary kiln baking device, and can reduce environmental influence, and maintenance cost is merely 35% of rotary kiln; Device of the present invention flows material backward in the past, air from after forward with material countercurrent flow, material and air realization counterflow heat exchange in flow process; The heat that multistage cooling system reclaims aluminum oxide on the one hand is set, thereby warm-up combustion-supporting air reduces hear rate simultaneously, also be convenient to safety of products conveying and storage.
Description of drawings
Fig. 1 is the apparatus structure synoptic diagram of the circulating fluidized bed stoving oven production high temperature alumina in the embodiment of the invention;
Among the figure 1, feed bin, 2, the Venturi flash dryer, 3, dust-precipitator, 4, air lift mud pump; 5, elementary cyclonic separator, 6,1 grades of preheating cyclonic separators, 7,2 grades of preheating cyclonic separators, 8,3 grades of preheating cyclonic separators; 9, circulating fluidized bed stoving oven, 10, high temperature cyclone separator, 11,1 grades of cooling cyclonic separators, 12,2 grades of cooling cyclonic separators; 13,3 grades of cooling cyclonic separators, 14,4 grades of cooling cyclonic separators, 15,1 grades of fluidizing coolers, 16,2 grades of fluidizing coolers; 17, cooling water pipeline, 18, air line, 19, U type material returning device.
Embodiment
The flow of the air lift mud pump that adopts in the embodiment of the invention is 25t/h.
Dry moment accomplished when the white lake in the embodiment of the invention in the entering Venturi flash dryer carried out drying by hot blast.
The solids concn of dust-precipitator discharging flue gas is≤50mg/Nm in the embodiment of the invention
3
The air quantity that gets into 1 grade of fluidizing cooler air line in the embodiment of the invention is 0.35N m with the gas-solid ratio that gets into the white lake in the Venturi flash dryer
3/ kg.
The air quantity that gets into 4 grades of cooling cyclonic separators in the embodiment of the invention is 0.35N m with the gas-solid ratio that gets into the white lake in the Venturi flash dryer
3/ kg.
The fluidization air that gets into 1 grade of fluidizing cooler and 2 grades of level fluidizing coolers in the embodiment of the invention is 0.25N m with the gas-solid ratio that gets into the white lake in the Venturi flash dryer
3/ kg.
Embodiment 1
The device of circulating fluidized bed stoving oven production high temperature alumina is as shown in Figure 1; Feed bin 1 outlet is communicated with Venturi flash dryer 2 through screw feeder; The top discharge mouth of Venturi flash dryer 2 is communicated with the opening for feed of dust-precipitator 3; The discharge port of dust-precipitator 3 is communicated with the opening for feed of air lift mud pump 4, and the top discharge mouth of air lift mud pump 4 is communicated with the opening for feed of elementary cyclonic separator 5, and the discharge port of elementary cyclonic separator 5 is communicated with the opening for feed of 1 grade of preheating cyclonic separator 6; The discharge port of 1 grade of preheating cyclonic separator 6 is communicated with the opening for feed of 2 grades of preheating cyclonic separators 7; The discharge port of 2 grades of preheating cyclonic separators 7 is communicated with the opening for feed of 3 grades of preheating cyclonic separators 8, and the discharge port of 3 grades of preheating cyclonic separators 8 is communicated with the last opening for feed of circulating fluidized bed stoving oven 9, and the discharge port of circulating fluidized bed stoving oven 9 is communicated with the opening for feed of high temperature cyclone separator 10; The sidepiece of circulating fluidized bed stoving oven 9 is provided with first inlet mouth, and the bottom is provided with second inlet mouth;
The air outlet of elementary cyclonic separator 5 is communicated with first inlet mouth of circulating fluidized bed stoving oven 9; The air outlet of 1 grade of preheating cyclonic separator 6 is communicated with the inlet mouth of Venturi flash dryer 2; The air outlet of 2 grades of preheating cyclonic separators 7 is communicated with the opening for feed of 1 grade of preheating cyclonic separator 6, and the air outlet of 3 grades of preheating cyclonic separators 7 is communicated with the opening for feed of 2 grades of preheating cyclonic separators 6;
High temperature cyclone separator 10 bottoms are provided with U type material returning device 19, and the returning charge leg of U type material returning device 19 is communicated with the recycle feed mouth of circulating fluidized bed stoving oven 9, and the sealing leg of U type material returning device 19 is communicated with the opening for feed of 1 grade of cooling cyclonic separator 11;
The discharge port of 1 grade of cooling cyclonic separator 11 is communicated with the opening for feed of 2 grades of cooling cyclonic separators 12; The discharge port of 2 grades of cooling cyclonic separators 12 is communicated with the opening for feed of 3 grades of cooling cyclonic separators 13; The discharge port of 3 grades of condensing surface cyclonic separators 13 is communicated with the opening for feed of 4 grades of cooling cyclonic separators 14; The discharge port of 4 grades of cooling cyclonic separators 14 is communicated with the opening for feed of 1 grade of fluidizing cooler 15, and the discharge port of 1 grade of fluidizing cooler 15 is communicated with the opening for feed of 2 grades of fluidizing coolers 16;
The air outlet of 1 grade of cooling cyclonic separator 11 is communicated with first inlet mouth of circulating fluidized bed stoving oven 9; The air outlet of 2 grades of cooling cyclonic separators 12 is communicated with the opening for feed of 1 grade of cooling cyclonic separator 11; The air outlet of 3 grades of cooling cyclonic separators 13 is communicated with the opening for feed of 2 grades of cooling cyclonic separators 12, and the air outlet of 4 grades of cooling cyclonic separators 14 is communicated with the opening for feed of 3 grades of cooling cyclonic separators 13;
1 grade of fluidizing cooler 15 is provided with fluidized wind blast inlet, fluidized wind air outlet, cooling duct blast inlet and cooling duct air outlet; The fluidisation air outlet is communicated with the blast inlet of 4 grades of cooling cyclonic separators 14, and the cooling duct air outlet is communicated with second inlet mouth of circulating fluidized bed stoving oven 9;
2 grades of fluidizing coolers 16 are provided with water-in, water outlet, fluidized wind air outlet and fluidized wind blast inlet, and the fluidized wind air outlet is communicated with the blast inlet of 4 grades of cooling cyclonic separators 14;
Method of work is:
The white lake raw material that will contain attached water places feed bin, is transferred in the Venturi flash dryer again, and the hot gas that transmits through 1 grade of preheating cyclonic separator carries out drying, forms water vapour and Aluminium Hydroxide; The hot gas flow velocity is 30m/s; The weight content of attached water is 5% in the white lake raw material;
Aluminium Hydroxide and water vapour carry out gas solid separation from the discharge port entering dust-precipitator of Venturi flash dryer, the solid Aluminium Hydroxide is transferred to through air lift mud pump and carries out gas solid separation in the elementary cyclonic separator;
The isolated solid of elementary cyclonic separator is transferred in 1 grade of preheating separator, 2 grades of preheating separators and 3 grades of preheating separators successively carries out preheating and gas solid separation; Be transferred at last in the circulating fluidized bed stoving oven; Feed warm air makes material be in fluidized state and carries out roasting from circulating fluidized bed stoving oven bottom; Material gets in the high temperature cyclone separator in company with air-flow and carries out the high temperature gas solid separation in the roasting process; Solid materials after the separation turns back to roasting once more in the circulating fluidized bed stoving oven through U type material returning device; Solid materials through after 5 circulations, is discharged the entering cooling system from U type material returning device in circulating fluidized bed stoving oven and high temperature cyclone separator; White lake removes a water molecules and forms gamma-alumina in this process, becomes αYang Hualv through pyrolytic conversion again;
The isolated gas of elementary cyclonic separator gets into the circulating fluidized bed stoving oven; 1 grade of isolated gas of preheating cyclonic separator gets into the Venturi flash dryer; 2 grades of isolated gases of preheating cyclonic separator get into 1 grade of preheating cyclonic separator; 3 grades of 2 grades of preheating cyclonic separators of gas entering that the preheating separator separates goes out; The isolated gas of high temperature cyclone separator gets into 3 grades of preheating cyclonic separators;
The solid materials of discharging from U type material returning device gets into 1 grade of cooling cyclonic separator, 2 grades of cooling cyclonic separators, 3 grades of cooling cyclonic separators and 4 grades of cooling cyclonic separators successively and cools off and gas solid separation; In 1 grade of fluidizing cooler, feed fluidization air, and in the air line of 1 grade of fluidizing cooler bubbling air; In the cooling water pipeline of 2 grades of fluidizing coolers, feed water, and feed fluidization air to 2 grades of fluidizing coolers; 4 grades of isolated cooling solid materials of cooling cyclonic separator get into 1 grade of fluidizing cooler; Under the fluidization air effect, be fluidized state and carry out air cooling; Get into 2 grades of fluidizing coolers then, discharge after be lower than 80 ℃ through water-cooled being fluidized state under the fluidization air effect;
Get into the circulating fluidized bed stoving oven from 1 grade of isolated gas of cooling cyclonic separator; Get into the opening for feed of 1 grade of cooling cyclonic separator from 2 grades of isolated gases of cooling cyclonic separator; Get into the opening for feed of 3 grades of cooling cyclonic separators from 3 grades of isolated gases of cyclonic separator; Get into the opening for feed of 3 grades of cooling cyclonic separators from 4 grades of isolated gases of cooling cyclonic separator, bubbling air cools off in 4 grades of cooling cyclonic separators simultaneously;
The fluidization air of from 1 grade of fluidizing cooler, discharging gets into 4 grades of cooling cyclonic separators, the air admission circulating fluidized bed stoving oven after the air of discharging in the cooling duct of 1 grade of fluidizing cooler is heated; 2 grades of 4 grades of cooling cyclonic separators of fluidizing agent entering that fluidizing cooler is discharged;
The maturing temperature of circulating fluidized bed stoving oven and the temperature of high temperature cyclone separator are 1400 ± 50 ℃, and the residence time of solid materials in circulating fluidized bed stoving oven and high temperature cyclone separator is 20s; Temperature when 1 grade of preheating cyclonic separator, 2 grades of preheating cyclonic separators and 3 grades of preheating cyclonic separator separation of material is followed successively by 340 ± 10 ℃, 630 ± 50 ℃ and 1100 ± 50 ℃, and the temperature of Aluminium Hydroxide is controlled at 145 ± 10 ℃;
Temperature when 1 grade of cooling cyclonic separator, 2 grades of cooling cyclonic separators, 3 grades of cooling cyclonic separators and 4 grades of cooling cyclonic separators cool off material is followed successively by 1320 ± 50 ℃, 1210 ± 50 ℃, 1050 ± 50 ℃ and 990 ± 50 ℃; 2 grades of fluidizing cooler drop temperatures are 70 ℃;
The weight content 95% of αYang Hualv from the isolated solid materials of high temperature cyclone separator.
Embodiment 2
The device of circulating fluidized bed stoving oven production high temperature alumina is with embodiment 1;
Method of work is with embodiment 1; Difference is: the hot gas flow velocity is 35m/s; The weight content of attached water is 6% in the white lake raw material; Solid materials circulates through 6 times in circulating fluidized bed stoving oven and high temperature cyclone separator; The residence time of solid materials in circulating fluidized bed stoving oven and high temperature cyclone separator is 25s; 2 grades of fluidizing cooler drop temperatures are 75 ℃; The weight content 96% of αYang Hualv from the isolated solid materials of high temperature cyclone separator.
Embodiment 3
The device of circulating fluidized bed stoving oven production high temperature alumina is with embodiment 1;
Method of work is with embodiment 1; Difference is: the hot gas flow velocity is 40m/s; The weight content of attached water is 8% in the white lake raw material; Solid materials circulates through 7 times in circulating fluidized bed stoving oven and high temperature cyclone separator; The residence time of solid materials in circulating fluidized bed stoving oven and high temperature cyclone separator is 30s; 2 grades of fluidizing cooler drop temperatures are 75 ℃; The weight content 97% of αYang Hualv from the isolated solid materials of high temperature cyclone separator.
Claims (6)
1. the device of a circulating fluidized bed stoving oven production high temperature alumina is characterized in that comprising Venturi flash dryer, dust-precipitator, air lift mud pump, elementary cyclonic separator, 1 grade of preheating cyclonic separator, 2 grades of preheating cyclonic separators, 3 grades of preheating cyclonic separators, circulating fluidized bed stoving oven, high temperature cyclone separator and cooling systems;
The top discharge mouth of Venturi flash dryer is communicated with the opening for feed of dust-precipitator; The discharge port of dust-precipitator is communicated with the opening for feed of air lift mud pump; The top discharge mouth of air lift mud pump is communicated with the opening for feed of elementary cyclonic separator; The discharge port of elementary cyclonic separator is communicated with the opening for feed of 1 grade of preheating cyclonic separator, and the discharge port of 1 grade of preheating cyclonic separator is communicated with the opening for feed of 2 grades of preheating cyclonic separators, and the discharge port of 2 grades of preheating cyclonic separators is communicated with the opening for feed of 3 grades of preheating cyclonic separators; The discharge port of 3 grades of preheating cyclonic separators is communicated with the last opening for feed of circulating fluidized bed stoving oven; The discharge port of circulating fluidized bed stoving oven is communicated with the opening for feed of high temperature cyclone separator, and the sidepiece of circulating fluidized bed stoving oven is provided with first inlet mouth, and the bottom is provided with second inlet mouth;
The high temperature cyclone separator bottom is provided with U type material returning device, and the returning charge leg of U type material returning device is communicated with the recycle feed mouth of circulating fluidized bed stoving oven, and the sealing leg of U type material returning device is communicated with cooling system.
2. the device of circulating fluidized bed stoving oven production high temperature alumina according to claim 1; The air outlet that it is characterized in that described elementary cyclonic separator is communicated with first inlet mouth of circulating fluidized bed stoving oven; The air outlet of 1 grade of preheating cyclonic separator is communicated with the inlet mouth of Venturi flash dryer; The air outlet of 2 grades of preheating cyclonic separators is communicated with the opening for feed of 1 grade of preheating cyclonic separator, and the air outlet of 3 grades of preheating cyclonic separators is communicated with the opening for feed of 2 grades of preheating cyclonic separators.
3. based on the device of the described recirculating fluidized bed roaster of claim 1 production high temperature alumina; It is characterized in that described cooling system comprises 1 grade of cooling cyclone separator; 2 grades of cooling cyclone separators, 3 grades of cooling cyclone separators, 4 grades of cooling cyclone separators, 1 grade of fluidizing cooler and 2 grades of fluidizing coolers; The charging aperture of 1 grade of cooling cyclone separator is communicated with the discharging opening of high temperature cyclone separator; The discharging opening of 1 grade of cooling cyclone separator is communicated with the charging aperture of 2 grades of cooling cyclone separators; The discharging opening of 2 grades of cooling cyclone separators is communicated with the charging aperture of 3 grades of cooling cyclone separators; The discharging opening of 3 grades of condenser cyclone separators is communicated with the charging aperture of 4 grades of cooling cyclone separators; The discharging opening of 4 grades of cooling cyclone separators is communicated with the charging aperture of 1 grade of fluidizing cooler, and the discharging opening of 1 grade of fluidizing cooler is communicated with the charging aperture of 2 grades of fluidizing coolers.
4. the method for a circulating fluidized bed stoving oven production high temperature alumina is characterized in that adopting the described device of claim 1, carries out according to the following steps:
The white lake raw material that (1) will contain attached water places feed bin, is transferred in the Venturi flash dryer again, and the hot gas that transmits through 1 grade of preheating cyclonic separator carries out drying, forms water vapour and Aluminium Hydroxide; The hot gas flow velocity is 30 ~ 40m/s; The weight content of attached water is 5 ~ 8% in the white lake raw material;
(2) Aluminium Hydroxide and water vapour carry out gas solid separation from the discharge port entering dust-precipitator of Venturi flash dryer, and the solid Aluminium Hydroxide is transferred to through air lift mud pump and carries out gas solid separation in the elementary cyclonic separator;
(3) the isolated solid of elementary cyclonic separator is transferred to successively in 1 grade of preheating separator, 2 grades of preheating separators and 3 grades of preheating separators and is carried out preheating and gas solid separation; Be transferred at last in the circulating fluidized bed stoving oven; Feed warm air makes material be in fluidized state and carries out roasting from circulating fluidized bed stoving oven bottom; Material gets in the high temperature cyclone separator in company with air-flow and carries out the high temperature gas solid separation in the roasting process; Solid materials after the separation turns back to roasting once more in the circulating fluidized bed stoving oven through U type material returning device; Solid materials through after at least 5 circulations, is discharged the entering cooling system from U type material returning device in circulating fluidized bed stoving oven and high temperature cyclone separator; White lake removes a water molecules and forms gamma-alumina in this process, becomes αYang Hualv through pyrolytic conversion again.
5. the method for a kind of circulating fluidized bed stoving oven production high temperature alumina according to claim 4; It is characterized in that the temperature when circulating fluidized bed stoving oven and high temperature cyclone separator circulate roasting is 1400 ± 50 ℃, the residence time of solid materials in circulating fluidized bed stoving oven and high temperature cyclone separator is 20 ~ 30s; Temperature when 1 grade of preheating cyclonic separator, 2 grades of preheating cyclonic separators and 3 grades of preheating cyclonic separator separation of material is followed successively by 340 ± 10 ℃, 630 ± 50 ℃ and 1100 ± 50 ℃.
6. the method for a kind of circulating fluidized bed stoving oven production high temperature alumina according to claim 4 is characterized in that weight content >=95% of αYang Hualv from the isolated solid materials of high temperature cyclone separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110434054.5A CN102515231B (en) | 2011-12-22 | 2011-12-22 | Apparatus and method for production of high temperature alumina with circulating fluidized bed roasting furnace |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201110434054.5A CN102515231B (en) | 2011-12-22 | 2011-12-22 | Apparatus and method for production of high temperature alumina with circulating fluidized bed roasting furnace |
Publications (2)
| Publication Number | Publication Date |
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| CN102515231A true CN102515231A (en) | 2012-06-27 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103466672A (en) * | 2013-07-04 | 2013-12-25 | 中国神华能源股份有限公司 | Crystallized aluminum chloride roasting system and method |
| CN104730210A (en) * | 2013-12-24 | 2015-06-24 | 贵阳铝镁设计研究院有限公司 | Testing device for extracting aluminum oxide from aluminum chloride crystal |
| CN106219584A (en) * | 2016-07-18 | 2016-12-14 | 沈阳鑫博工业技术股份有限公司 | A kind of reduce the device and method of alpha-aluminium oxide content in metallurgical-grade aluminum oxide |
| CN106495195A (en) * | 2016-12-05 | 2017-03-15 | 沈阳鑫博工业技术股份有限公司 | A kind of multifunctional roasting device and control method |
| CN108147799A (en) * | 2017-12-27 | 2018-06-12 | 杨松 | A kind of recirculating fluidized bed roasting revolution all-in-one oven |
| CN109432934A (en) * | 2018-12-30 | 2019-03-08 | 福建龙净环保股份有限公司 | A kind of gas cleaning integrated system and aluminium oxide calcining process system |
| CN109556414A (en) * | 2017-09-27 | 2019-04-02 | 沈阳铝镁设计研究院有限公司 | A kind of residual-heat utilization method and device of Aluminium hydroxide roasting furnace product |
| CN110316748A (en) * | 2019-08-22 | 2019-10-11 | 中国科学院过程工程研究所 | A kind of roasting system and the method for producing Alpha-alumina |
| CN111233018A (en) * | 2020-03-18 | 2020-06-05 | 清华大学 | Aluminum hydroxide roasting system and low-nitrogen roasting method thereof |
| CN113816408A (en) * | 2021-10-14 | 2021-12-21 | 周运刚 | System for utilize high temperature alumina feeding to smelt white alundum |
| CN113945092A (en) * | 2021-10-15 | 2022-01-18 | 沈阳鑫博工业技术股份有限公司 | Sealing valve device suitable for production of bifunctional alumina powder and use method |
| CN115010164A (en) * | 2022-05-31 | 2022-09-06 | 张绪祎 | System and method for preparing cerium dioxide by dehydrating and burning wet cerium carbonate material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103466672A (en) * | 2013-07-04 | 2013-12-25 | 中国神华能源股份有限公司 | Crystallized aluminum chloride roasting system and method |
| CN103466672B (en) * | 2013-07-04 | 2016-01-20 | 中国神华能源股份有限公司 | A kind of crystal aluminum chloride roasting system and method |
| CN104730210A (en) * | 2013-12-24 | 2015-06-24 | 贵阳铝镁设计研究院有限公司 | Testing device for extracting aluminum oxide from aluminum chloride crystal |
| CN106219584A (en) * | 2016-07-18 | 2016-12-14 | 沈阳鑫博工业技术股份有限公司 | A kind of reduce the device and method of alpha-aluminium oxide content in metallurgical-grade aluminum oxide |
| CN106495195A (en) * | 2016-12-05 | 2017-03-15 | 沈阳鑫博工业技术股份有限公司 | A kind of multifunctional roasting device and control method |
| CN106495195B (en) * | 2016-12-05 | 2017-09-05 | 沈阳鑫博工业技术股份有限公司 | A kind of multifunctional roasting device and control method |
| CN109556414A (en) * | 2017-09-27 | 2019-04-02 | 沈阳铝镁设计研究院有限公司 | A kind of residual-heat utilization method and device of Aluminium hydroxide roasting furnace product |
| CN109556414B (en) * | 2017-09-27 | 2020-06-12 | 沈阳铝镁设计研究院有限公司 | Method and device for utilizing waste heat of aluminum hydroxide roasting furnace product |
| CN108147799A (en) * | 2017-12-27 | 2018-06-12 | 杨松 | A kind of recirculating fluidized bed roasting revolution all-in-one oven |
| CN108147799B (en) * | 2017-12-27 | 2020-01-14 | 杨松 | Roasting and rotating integrated furnace of circulating fluidized bed |
| CN109432934A (en) * | 2018-12-30 | 2019-03-08 | 福建龙净环保股份有限公司 | A kind of gas cleaning integrated system and aluminium oxide calcining process system |
| CN110316748A (en) * | 2019-08-22 | 2019-10-11 | 中国科学院过程工程研究所 | A kind of roasting system and the method for producing Alpha-alumina |
| CN111233018A (en) * | 2020-03-18 | 2020-06-05 | 清华大学 | Aluminum hydroxide roasting system and low-nitrogen roasting method thereof |
| CN113816408A (en) * | 2021-10-14 | 2021-12-21 | 周运刚 | System for utilize high temperature alumina feeding to smelt white alundum |
| CN113945092A (en) * | 2021-10-15 | 2022-01-18 | 沈阳鑫博工业技术股份有限公司 | Sealing valve device suitable for production of bifunctional alumina powder and use method |
| CN113945092B (en) * | 2021-10-15 | 2024-03-08 | 沈阳鑫博工业技术股份有限公司 | Sealing valve device suitable for production of difunctional alumina powder and use method |
| CN115010164A (en) * | 2022-05-31 | 2022-09-06 | 张绪祎 | System and method for preparing cerium dioxide by dehydrating and burning wet cerium carbonate material |
| CN115010164B (en) * | 2022-05-31 | 2024-04-19 | 华清燚能(北京)科技有限公司 | System and method for preparing cerium dioxide by adopting cerium carbonate wet material through dehydration and burning |
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