CN205760633U - A kind of processing system of spodumene calcination rotary kiln kiln exit gas - Google Patents
A kind of processing system of spodumene calcination rotary kiln kiln exit gas Download PDFInfo
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- CN205760633U CN205760633U CN201620713244.9U CN201620713244U CN205760633U CN 205760633 U CN205760633 U CN 205760633U CN 201620713244 U CN201620713244 U CN 201620713244U CN 205760633 U CN205760633 U CN 205760633U
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Abstract
This utility model belongs to lithium and produces equipment technical field, is specifically related to the processing system of a kind of spodumene calcination rotary kiln kiln exit gas.This system includes rotary kiln, high temperature membrane defecator, catalytic denitration device, air cooler, desulfurizer and the tapping equipment being sequentially connected in series along flow direction of material.Processing system provided by the utility model is based on intermetallic compound filter membrane and the feature of other high temperature filtration films and the application of filtering high-temperature flue gas technology, the application technology of original SCR is innovated, gas cleaning is carried out in the fume high-temperature stage, flue gas after purification carries out SCR catalytic reaction and realizes denitration, then gas carries out desulfurization process, reaches discharge standard.
Description
Technical field
This utility model belongs to lithium and produces equipment technical field, is specifically related to a kind of spodumene calcination rotary kiln kiln exit gas
Processing system.
Background technology
Spodumene is the key industry raw mineral materials of current lithium chemicals.The lithiumations such as lithium bromide, lithium chloride, Lithium hydrate
Compound is widely used in air-conditioning, freezes, dehumidifies and air cleaning；Butyl lithium is used as main body anisotropic rubber and elastomeric polymerization is urged
Agent；Lithium base grease disguises standby, petrochemical equipment, precision instrument etc. for military machines；Lithium battery is used for cardiac pacing
The electronic devices such as device, sonifer, pocket calculator, flash lamp, accutron.Lithium metal and lithium material be also widely used in atomic energy,
The industrial departments such as Aeronautics and Astronautics, military affairs, metallurgy, electronics, glass, pottery, machine-building.The purposes of lithium is constantly expanding,
The new application of developing is for controllable thermonuclear fusion heap and Lithium carbonate solution fuel cell etc..Lithium is following " energy " metal,
It is expected to become to the important fuel of mankind's supply of long duration energy.
Spodumene has three kinds of crystal formations, and natural is referred to as α type spodumene；Through being heated to 1150 DEG C～1200 DEG C, can change
Become β type spodumene；β type spodumene can be transformed into the spodumene of γ type at higher temperatures.α type spodumene is monoclinic system,
Compact structure, chemical inertness is big, outside dehydrogenation fluoric acid hardly with various acid and alkali reactions, so lithium should not directly be carried.β type lithium brightness
Stone is tetragonal structure, owing to the physicochemical properties changing mineral of crystal formation also produce significantly change, can produce anti-with soda acid
Should, be suitable to the extraction of lithium.Therefore the crystal conversion roasting technique of spodumene is the whole basis putting forward lithium technique, crystal formation conversion roasting
Quality directly affect the response rate of lithium.
In carrying out roasting process, need rotary kiln exit gas is processed.Traditional process technique such as Fig. 1 institute
Show, and this defective workmanship be as follows:
1. nitrogen oxides is not processed by this vent gas treatment, will cause discharging the most up to standard, cause serious ring
Environment pollution；
2. electrostatic precipitation precision reduces, and effect is unstable so that in gas, dust content is higher, exceedes discharge standard；
3. electrostatic precipitation Maintenance Difficulty, efficiency is low；
4. in flue gas, dust content is many, all greatly improves desulphurization system efficiency and difficulty.
SCR (Selective Catalytic Reduction) is SCR technology, and the catalysis of current ammonia is also
Former method is ammonia nitrogen removal technology that should be with the most use.It does not has by-product, is formed without secondary pollution, and apparatus structure is simple, and takes off
Except efficiency is high (up to more than 90%), reliable, it is simple to the advantages such as maintenance.
The selectivity of such technology refers in the effect of catalyst with under oxygen existence condition, NH3Preferential and NOxOccur
Reduction elimination reaction, generates nitrogen and water, and the oxygen in flue gas of getting along well carries out oxidation reaction, and its dominant response formula is:
4NO+4NH3+O2→4N2+6H2O (1)
2NO2+4NH3+O2→3N2+6H2O (2)
In the case of there is no catalyst, above-mentioned chemical reaction be within the scope of the narrowest temperature (about 980 DEG C) enter
OK, when using catalyst, its reaction temperature can be controlled at 300～400 DEG C and carries out, and is equivalent to boiler economizer and air preheat
Flue-gas temperature between device so that it is well adapt to the tail gas denitration of power industry, and this technology is currently also mainly used in
Power industry.
Utility model content
For solving the deficiencies in the prior art, this utility model provides the place of a kind of spodumene calcination rotary kiln kiln exit gas
Reason system, solves lithium and produces the overall emission problem of tail gas, utilize and realize high temperature fume dust removal, denitration and desulfurization.
The technical scheme that this utility model solves above-mentioned technical problem is as follows:
This utility model additionally provides the processing system of a kind of spodumene calcination rotary kiln kiln exit gas, along flow direction of material,
Including the rotary kiln being sequentially connected in series, high temperature membrane defecator, catalytic denitration device, air cooler, desulfurizer and tapping equipment.
Flue gas enter high temperature membrane defecator, dust through high temperature filtration film intercept, intercepting efficiency up to more than 99.99%,
Clean gas enters SCR system and carries out denitration, and after denitration, gas enters desulphurization system after air cooler, and desulfurization fume can directly be arranged
Put.
Concrete, described high temperature membrane defecator at least include air inlet, gas outlet and be arranged on described air inlet and
The high temperature membrane being perpendicular to flow direction of material between described gas outlet.
Concrete, described high temperature membrane is intermetallic compound film, ceramic membrane, metal film or metal sintering film.Operating temperature
At 320～360 DEG C, thus the filtration of spodumene baking tail gases can be applicable to.
Concrete, the aperture of described high temperature membrane is 5～20 μm, porosity 30～45%.
Intermetallic compound film: the film formed by intermetallic compound.Intermetallic compound (intermetallic
Compound) compound being combined between metal and metal, metal and metalloid is referred to metallic bond or covalent bond form.
Atom in intermetallic compound follows the arrangement of certain ordering.Such as, Cu6Sn15、Cu3Sn、CuZn、InSb、
GaAs, CdSe etc. are intermetallic compounds.Such membrane material may be from prior art, such as, obtain by the way of purchase
Arrive, such as: the Al series metal compounds film (FeAl, TiAl, NiAl etc.) that Chengdu YiTai Science Co., Ltd produces.
Ceramic membrane: ceramic membrane (ceramic membrane), also known as inorganic ceramic film, is through special with inorganic ceramic material
The anisotropic membrane that technique is prepared and formed.Such membrane material may be from prior art, such as, obtain by the way of purchase, example
As: the high-temperature ceramics filter element of the fly-ash filter that bohr company produces, etc..
Metal film: with porous stainless steel as matrix, TiO2Pottery is compound inorganic of the metal-ceramic of film material
Film.Such membrane material may be from prior art, such as, obtain, such as by the way of purchase: the titanium, no that Xi'an Powerleader produces
Rust steel porous material, etc..
Metal sintering film: formed by metal sintered material (also known as sintered metal materials) material.Such membrane material may be from
Prior art, such as, obtain, such as: the sintered metal mesh porous material of Xi'an Powerleader by the way of purchase, etc..
Generally, processing system provided by the utility model is based on intermetallic compound filter membrane and other high temperature filtrations
The feature of film (such as ceramic membrane, metal sintering film etc.) and the application of filtering high-temperature flue gas technology, by the application technology of original SCR
Innovating, carry out gas cleaning in the fume high-temperature stage, the flue gas after purification carries out SCR catalytic reaction and realizes denitration, then
Gas carries out desulfurization process, reaches discharge standard.
The advantage of technical scheme provided by the utility model:
1. pair kiln exit gas filters, and is intercepted by the dust in flue gas, and clean gas carries out SCR system and urges
Change denitration, then carry out follow-up system and carry out desulfurization, until qualified discharge below；
2. having carried out high-temperature dust removal purification, catalyst decreases abrasion, is effectively increased the service life of catalyst；
3. reduce catalyst activity deterioration rate, improve denitration efficiency；
4. take full advantage of the heat of high-temperature flue gas, carry out dedusting at hot stage, it is not necessary to flue gas is reheated, fall
Low system operation cost.
Accompanying drawing explanation
Fig. 1 is the process chart of spodumene calcination rotary kiln kiln exit gas in prior art.
Fig. 2 is the system diagram of the processing system of spodumene calcination rotary kiln kiln exit gas provided by the utility model.
In accompanying drawing 2, the device representated by each label is as follows:
1, rotary kiln, 2, high temperature membrane defecator, 3, catalytic denitration device, 4, air cooler, 5, desulfurizer, 6, discharge dress
Put.
Detailed description of the invention
Being described principle of the present utility model and feature below, illustrated embodiment is served only for explaining this utility model,
It is not intended to limit scope of the present utility model.
In a detailed description of the invention, as in figure 2 it is shown, the process system of a kind of spodumene calcination rotary kiln kiln exit gas
System, along flow direction of material, including the rotary kiln 1 being sequentially connected in series, high temperature membrane defecator 2, catalytic denitration device 3, air cooler 4, takes off
Sulfur device 5 and tapping equipment 6.
The work process of this system is:
1) tail gas obtained after spodumene roasting is filtered by high temperature filtration, tail gas after being filtered.
Concrete, step 1) in: carry out high temperature filtration by high temperature membrane；After filtration, the temperature of tail gas is 320～360 DEG C；
After filtration, the dust concentration of tail gas is less than 30mg/m3。
On the one hand, spodumene roasting generally uses rotary kiln, and the temperature of kiln discharge flue gas is generally at 360～400 DEG C.This high temperature
Flue gas is through the high temperature filtration of high temperature membrane, and temperature still can maintain 320～360 DEG C.
On the other hand, after filtration, tail gas can be passed through catalytic denitration (SCR) system and carries out denitration.As it was noted above, such is anti-
The catalytic temperature answered can be controlled in 300～400 DEG C, and the tail gas of 320～360 DEG C after being filtered by afore-said hot, just with urge
The temperature changing denitration is adaptive, thus substantially without heat up or cooling process, the most temperature controlled in the case of,
Tail gas after filtration is directly carried out denitration.
Another further aspect, after high temperature filtration, filtration, in tail gas, dust greatly reduces, thus ensures in catalytic denitration system
The service life of catalyst.
2) step 1) tail gas carries out denitration by catalytic denitration after the filtration that obtains, obtains tail gas after denitration.
Concrete, step 2) in: after denitration, the temperature of tail gas is 300～330 DEG C；Denitration efficiency is more than or equal to 90%.
3) step 2) tail gas is lowered the temperature after the denitration that obtains, tail gas after being lowered the temperature.
Concrete, step 3) in: after cooling, the temperature of tail gas is 120～150 DEG C；Cooling method is air cooling.
4) step 3) tail gas carries out desulfurization after the cooling that obtains, obtains tail gas after desulfurization.
5) discharge.
Effect example 1
Along flow direction of material, processing system A of spodumene calcination rotary kiln kiln exit gas includes rotary kiln, the height being sequentially connected in series
Temperature film filter, catalytic denitration device, air cooler, desulfurizer and tapping equipment.
Kiln exit gas temperature 385～about 390 DEG C.High temperature membrane defecator: between air outlet temperature 350～355 DEG C, give vent to anger
Dust content is less than or equal to 10mg/m3, film is set to intermetallic compound film, selects the ferrum aluminum of Chengdu YiTai Science Co., Ltd
Intermetallic compound porous material filter element Φ 130 × 2500.
In emission: nitrogen oxide removal efficiency 92～93%, sulfide clearance is more than 98%.
Effect example 2
Along flow direction of material, processing system B of spodumene calcination rotary kiln kiln exit gas includes rotary kiln, the height being sequentially connected in series
Temperature film filter, catalytic denitration device, air cooler, desulfurizer and tapping equipment.
Kiln exit gas temperature 385～about 390 DEG C.High temperature membrane defecator: between air outlet temperature 348～355 DEG C, give vent to anger
Dust content is less than or equal to 15mg/m3, film is set to ceramic membrane, selects the Φ of Shandong Industrial Ceramic Design Institute Co., Ltd.
70 × 1500 high temperature gas cleaning ceramic elements.
In emission: nitrogen oxide removal efficiency 92～93%, sulfide clearance is more than 98%.
Effect example 3
Along flow direction of material, processing system C of spodumene calcination rotary kiln kiln exit gas includes rotary kiln, the height being sequentially connected in series
Temperature film filter, catalytic denitration device, air cooler, desulfurizer and tapping equipment.
Kiln exit gas temperature 385～about 390 DEG C.High temperature membrane defecator: between air outlet temperature 342～345 DEG C, give vent to anger
Dust content is less than or equal to 8mg/m3, film is set to metal film, selects western BaoDe Science Co., Ltd SG005 metal
Film.
In emission: nitrogen oxide removal efficiency 91～93%, sulfide clearance is more than 98%.
Effect example 4
Along flow direction of material, processing system C of spodumene calcination rotary kiln kiln exit gas includes rotary kiln, the height being sequentially connected in series
Temperature film filter, catalytic denitration device, air cooler, desulfurizer and tapping equipment.
Kiln exit gas temperature 385～about 390 DEG C.High temperature membrane defecator: between air outlet temperature 335～340 DEG C, give vent to anger
Dust content is less than or equal to 8mg/m3, film is set to metal sintering film, selects western BaoDe Science Co., Ltd NG006 gold
Belong to sintered membrane.
In emission: nitrogen oxide removal efficiency 92～94%, sulfide clearance is more than 98%.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all in this practicality
Within novel spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in guarantor of the present utility model
Within the scope of protecting.
Claims (5)
1. the processing system of a spodumene calcination rotary kiln kiln exit gas, it is characterised in that along flow direction of material, including going here and there successively
Rotary kiln, high temperature membrane defecator, catalytic denitration device, air cooler, desulfurizer and the tapping equipment of connection.
The processing system of spodumene calcination rotary kiln kiln exit gas the most according to claim 1, it is characterised in that: described height
Temperature film filter at least includes air inlet, gas outlet and is arranged on being perpendicular between described air inlet and described gas outlet
The high temperature membrane of flow direction of material.
The processing system of spodumene calcination rotary kiln kiln exit gas the most according to claim 1, it is characterised in that: described height
The operating temperature of temperature film filter is 320～360 DEG C.
The processing system of spodumene calcination rotary kiln kiln exit gas the most according to claim 1, it is characterised in that: described height
Temperature film is intermetallic compound film, ceramic membrane, metal film or metal sintering film.
The processing system of spodumene calcination rotary kiln kiln exit gas the most according to claim 1, it is characterised in that described height
Temperature film: aperture is 5～20 μm, and porosity is 30～45%.
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| CN106178933A (en) * | 2016-07-07 | 2016-12-07 | 四川思达能环保科技有限公司 | The processing method of a kind of spodumene calcination rotary kiln kiln exit gas and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106178933A (en) * | 2016-07-07 | 2016-12-07 | 四川思达能环保科技有限公司 | The processing method of a kind of spodumene calcination rotary kiln kiln exit gas and system |
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