CN108483950A - A kind of high activity MgO roasting techniques and its dedicated unit - Google Patents
A kind of high activity MgO roasting techniques and its dedicated unit Download PDFInfo
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- CN108483950A CN108483950A CN201810346798.3A CN201810346798A CN108483950A CN 108483950 A CN108483950 A CN 108483950A CN 201810346798 A CN201810346798 A CN 201810346798A CN 108483950 A CN108483950 A CN 108483950A
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- mgo
- gas
- calcinator
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- 230000000694 effects Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 61
- 238000001354 calcination Methods 0.000 claims abstract description 41
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 38
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 38
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims description 38
- 239000002994 raw material Substances 0.000 claims description 28
- 239000000428 dust Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 8
- 239000000779 smoke Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000012716 precipitator Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 4
- 235000012054 meals Nutrition 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000008439 repair process Effects 0.000 abstract description 3
- 238000003860 storage Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 102
- 239000007789 gas Substances 0.000 description 37
- 235000014380 magnesium carbonate Nutrition 0.000 description 27
- 238000004519 manufacturing process Methods 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- PFRUBEOIWWEFOL-UHFFFAOYSA-N [N].[S] Chemical compound [N].[S] PFRUBEOIWWEFOL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 235000019580 granularity Nutrition 0.000 description 1
- 150000002680 magnesium Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
Abstract
The present invention discloses a kind of high activity MgO roasting techniques and device, the roasting technique are：Magnesium carbonate powder is first contacted into mixing with hot wind, heat is absorbed, so that temperature of charge is preheated to about 350 DEG C, then calcined through eddy flow, MgO and CO are calcination into 800 DEG C ~ 1000 DEG C temperature ranges2Mixture, MgO and CO after cooling2Mixture enters separator and realizes Conveyance, collects the powder to get off and enters finished bin storage, and the exhaust gas of effusion through chimney is discharged into air after being handled by emission-control equipment.The present invention changes that existing high activity MgO calciner plant equipment investments are big, operation cycle is short, repair density is big, heat consumption is high, product quality fluctuates big disadvantage, a kind of high activity MgO roasting techniques and its dedicated unit are developed, which has the advantages that small investment, equipment are simple, service life is long, maintenance difficulty is low, firing heat consumption is low, Product Activity stability is good.
Description
Technical field
It is the present invention relates to light-burned MgO roasting kilns technology, more particularly to a kind of to roast work using the high activity MgO of magnesite
Skill and its dedicated unit.
Background technology
Light-burned MgO is by magnesite (MgCO3) formed by calcining, grinding.Magnesite (MgCO3) theoretical decomposition temperature
It is 560 DEG C；When temperature is less than 560 DEG C, magnesite cannot decompose, and cause raw burn；When temperature is higher than 560 DEG C, magnesite starts point
Solution, the MgO granularities of generation are small, and activity is high；With the raising of calcination temperature, MgO compact crystallizations, activity becomes smaller.
The roasting of light-burned MgO is a kind of chemical reaction process, MgCO3It is thermally decomposed into MgO and CO2, burning and underburnt all can
Lead to the reduction of MgO activity, or even loses activity.
Activity and the calcination temperature of MgO has direct relation, in order to improve the activity of MgO, the side of general multi-purpose low temperature calcination
Method.The industrialized production overwhelming majority of current light-burned MgO uses kiln process.
Shaft kiln production Technology equipment falls behind, and calcination temperature is higher (about 1200 DEG C~1300 DEG C), with bulk material
The mode of (100mm~300mm) magnesite raw material layering tiling stacking is calcined in kiln, and gas-solid reaction contact area is small, calcining
Time is long, raw outer burnt in product, and surface calcining excessively easily causes material " dead roasting ", and inside calcining, which is not thorough, causes material " to be owed
Burn ", it is difficult to produce high activity MgO, production process is observed in flame-observing hole by operator, breaks up, screen discharging, automation
Degree is low, and in exhaust gas dust emission concentration it is high (>500mg/Nm3), it is a kind of very backward MgO production methods.
The Chinese patent literature of publication number CN102674408A discloses a kind of continuous production side of light calcined magnesia kiln
Method is realized the continuous production of light calcined magnesia using a kind of three-dimensional combustion system cooperation continuous gas supply, overcome existing
Stop the thermal loss in kiln start-up course in shaft kiln production technology, improves energy utilization rate.This method is simply by adding coal
Gas storage tank improves the duration of gas supply, but still uses bulky grain magnesite for raw material, does not change fundamentally
The small defect of gas-solid reaction contact area not can significantly reduce although improving the unit-hour output of shaft kiln production magnesia
The firing heat consumption of light calcined magnesia, can not Effective Regulation light calcined magnesia Product Activity.
The Chinese patent literature of publication number CN106431021A discloses a kind of preparation method of concrete magnesia,
It is to use bulky grain magnesite (10mm~150mm) for raw material, with 800 DEG C~1100 DEG C of calcination temperature, in rotary kiln device
The middle MgO for carrying out industrialized production different activities.When this method production MgO, still using bulky grain magnesite as raw material, calcining
When reaction, gas-solid reaction contact area is small, and the uneven and heat transfer efficiency that conducts heat is low, lacks preheating step, and exhaust gas exhaust temperature is high,
It is difficult to realize the recycling of waste heat, the firing heat consumption of MgO is high.It is set in addition, calcined by rotary kiln equipment is a kind of rotation of large size
It is standby, it takes up a large area, total investment expenses are high, and rotary kiln furnace lining is easy to fall off in rotation process, and service life is short, maintenance cost
With height.
The Chinese patent literature of publication number CN101306924A discloses light-burning magnesium powder for rotary kiln method and device, using grain
The powder magnesite that diameter is 0~4mm is raw material, in a manner of downflow type heat exchange, the calcining preparation MgO in rotary kiln.It is this
When method produces MgO, although reducing the particle size of magnesite raw material, gas-solid reaction contact area is increased, improves biography
Thermal uniformity and efficiency, but this production technology lacks preheating step, exhaust gas exhaust temperature is high, and utilization rate of waste heat is low, it is difficult to
The apparent firing heat consumption for lowering MgO, and the light-burning magnesium powder being burnt into cannot be used directly, also need with grinding machine grinding at 0.08mm with
Under fine powder could use.Since this production technology uses rotary kiln for calciner, equally exist take up a large area, furnace lining
Easy to fall off in rotation process, the shortcomings of service life is short, maintenance cost is high.
The Chinese patent literature of publication number CN106007415A discloses a kind of suspension flash preparation light-burned oxidation of high activity
Magnesium complexes use fine powder magnesite for raw material, and light-burned MgO is prepared by calciner of suspension kiln.But the equipment of the invention
Structure is excessively complicated, huge, and cost of equipment is high, and general enterprises are powerlessly purchased, it is difficult to a wide range of to promote and apply.
Invention content
The present invention overcomes in the prior art that the equipment investment of high activity MgO calciner plants is big, operation cycle is short, repair density
Greatly, heat consumption is high, product quality fluctuates big shortcoming, provides that a kind of small investment, equipment is simple, service life is long, repair is difficult
Spend low, firing heat consumption is low, Product Activity stability is good high activity MgO roasting techniques and its dedicated unit.
The present invention uses following roasting technique：Magnesium carbonate powder is first contacted into mixing with hot wind, heat is absorbed, makes material temperature
Degree is preheated to about 350 DEG C, then is calcined through eddy flow, and MgO and CO are calcination into 800 DEG C~1000 DEG C temperature ranges2Mixture,
MgO and CO after cooling2Mixture enters separator and realizes Conveyance, collects the powder to get off and enters finished bin storage,
The exhaust gas of effusion through chimney is discharged into air after being handled by emission-control equipment.
The magnesium carbonate powder contacts mixing with hot wind, is carried out in preheating furnace.Magnesium carbonate powder is first passed through into conveying
Equipment contacts mixing with hot wind, absorbs heat, keep magnesium carbonate powder pre- in air-flow preheating furnace from air-flow preheating furnace bottom feeding
Heat, preheated magnesium carbonate powder are escaped with hot gas from air-flow preheating furnace top discharge mouth.
The eddy flow calcining is carried out in spiral flow calcinator, and entering eddy flow by the feed inlet at the top of spiral flow calcinator forges
Stove is burnt, magnesium carbonate carries out being calcination into MgO and CO in eddy flow calcining2Mixture.
In above-mentioned technique, to accurately control calcination temperature, in the entrance of spiral flow calcinator, middle part and exit and gas
It flows the entrance of preheating furnace and exit is equipped with temperature control detector, and by the combustion system at temperature data and each position
Gas quantity data carry out coordinated signals by computer system, to ensure the stability of calcination temperature.
In above-mentioned technique, the combustion system of heat effect, combustion system position are played in the preheating furnace and spiral flow calcinator
In four channels, one of channel is located at preheating furnace lower part, and main to play a part of to preheat magnesium carbonate raw meal powder, the other three is logical
Road distribution plays calcining and decomposing magnesium carbonate raw meal powder positioned at the upper, middle and lower three of spiral flow calcinator；It is generated in cooling
Hot-air is sent to the combustion fan inlet of combustion system by air hose and carries out UTILIZATION OF VESIDUAL HEAT IN.It is burnt to reduce high activity MgO products
At heat consumption, the hot-air produced at cooling device is sent by air hose to the combustion fan inlet of combustion system and carries out waste heat profit
With.
In above-mentioned technique, for the dust discharge amount for reducing in production process, gas material mixture is defeated using the air-flow with pipeline
It send system conveying to leak to reduce dust, and roof scrubber is equipped with to reduce dust row in the silo roof of raw material cabin and finished bin
Put concentration.
The high activity MgO roasts dedicated unit, including the burning of raw material cabin, air-flow preheating furnace, spiral flow calcinator, multichannel
System, cooling device, separator, emission-control equipment, finished bin, chimney and hygrosensor, wherein raw material cabin pass through defeated
It send equipment to preheat furnace bottom feed inlet with air-flow to be connected, air-flow preheating furnace discharge port and the feed inlet phase at the top of spiral flow calcinator
Even, the discharge port of spiral flow calcinator bottom is connected with the hot side feed inlet of cooling device, the cold side discharge port of cooling device with divide
Upper feed inlet from device is connected, and the top gas outlet of separator is connected with the air inlet of emission-control equipment, at exhaust gas
The gas outlet of reason device is connected with chimney, and the bottom discharge mouth of separator is connected by conveying equipment with finished bin.
It is equipped with screw conveyor in above-mentioned apparatus, between raw material cabin and air-flow preheating furnace, bucket elevator, feeding bin, quantitatively feeds
Expect screw machine, the magnesium carbonate component in raw material cabin first passes through screw conveyor and bucket elevator is sent to feeding bin, then passes through feeding bin
The quantitative feeding serew machine of bottom is sent to preheating in air-flow preheating furnace.
In above-mentioned apparatus, air-flow preheats furnace bottom and is equipped with combustion chamber, and combustion chamber is by a set of combustion system heat supply.
In above-mentioned apparatus, spiral flow calcinator is equipped with three sets of combustion systems, be located at the top of spiral flow calcinator, middle part and
Bottom makes the temperature in spiral flow calcinator can guarantee uniformity.
In above-mentioned apparatus, the cooling device is double pipe heat exchanger, and the gas material in spiral flow calcinator after calcining and decomposing is mixed
Close object entered in heat exchanger by bottom discharge mouth, cold wind is blown into through air blower from heat exchanger cold side, the hot-air after heat exchange from
Hot wind is provided to four sets of combustion systems respectively by air hose after the effusion of heat exchanger hot side, carries out UTILIZATION OF VESIDUAL HEAT IN.
In above-mentioned apparatus, the separator be rotoclone collector, by rotoclone collector by MgO powder after cooling with
CO2The mixture of gas carries out gas solid separation, collects the MgO powder to get off and is sent into finished bin from rotoclone collector bottom, whirlwind is received
The gas being discharged at the top of dirt device is divided into two-way through system fan, and a routing return fan is sent to the heating system progress of air-flow preheating furnace
UTILIZATION OF VESIDUAL HEAT IN, after a routing is located at the bag filter dedusting of finished product silo roof, then through smoke stack emission.
In above-mentioned apparatus, the emission-control equipment is bag filter, the dust-laden tail that will first be isolated in separator
After gas dedusting, then pass through smoke stack emission.To ensure to be less than the temperature in use of cloth bag into the gas temperature of bag filter, in bag
Cold blast sliding valve is housed at formula dust-precipitator entrance air hose.
In above-mentioned apparatus, for the dust concentration for reducing in production process, raw material cabin top and finished bin top are equipped with storehouse
Push up deduster.
In above-mentioned apparatus, to accurately control calcination temperature, in the entrance of spiral flow calcinator, middle part and exit and gas
It flows the entrance of preheating furnace and exit is equipped with temperature control detector, and by the combustion system at temperature data and each position
Gas quantity data carry out coordinated signals by computer system, to ensure the stability of calcination temperature.
Compared with prior art, beneficial effects of the present invention are：(1), equipment gross investment is few, and floor space is small：With daily output
For the calciner of 500 tons of light-burned MgO, calciner plant output investment ratio calcined by rotary kiln device of the invention few 50% or so accounts for
Ground area is only 1/5th of calcined by rotary kiln device；(2) calciner plant of the invention does not have in addition to wind turbine and conveying equipment
Large-scale rotating machinery, furnace lining are in static arrangement, and not easily to fall off, service life is long, and maintenance difficulty is low, and expense is few；(3), this hair
Bright calcine technology is calcined using fine-powdered (0~0.08mm) magnesite as raw material through air-flow preheating and eddy flow, gas-solid reaction contact
Area is big, and heat transfer efficiency is high, and calcination temperature field is stablized, and the light-burned MgO activity of firing is high, and good product quality takes full advantage of cold
But the hot wind at device and separator, improves utilization rate of waste heat, hence it is evident that reduce firing heat consumption；(4), to the pollution of environment
It is small：The calcine technology burning of the present invention is complete, and excess air coefficient is low, and the oxygen content in exhaust gas is low, nitrogen sulfur compound production quantity
It is few, and whole system closure is good, and dust-precipitator is equipped at material stock, and the dust content being discharged into air is respectively less than 30mg/
Nm3。
Description of the drawings
Fig. 1 show a kind of high activity MgO roasting techniques of the present invention and its dedicated unit structural schematic diagram.
In figure：1, raw material cabin；11, screw conveyor；12, bucket elevator；13, feeding bin；14, quantitative feeding serew machine；15、
Silo roof dust-precipitator；2, air-flow preheating furnace；3, spiral flow calcinator；4, multichannel combustion system；5, cooling device；51, air blower；6、
Separator；7, emission-control equipment；8, finished bin；81, silo roof dust-precipitator；9, chimney；10, hygrosensor.
Specific implementation mode
To keep present disclosure more obvious and easy to understand, the present invention is done into one with reference to the accompanying drawings and detailed description
Walk explanation.
A kind of high activity MgO roastings dedicated unit, as shown in Figure 1, including raw material cabin (1), air-flow preheating furnace (2), eddy flow
Calcining furnace (3), multichannel combustion system (4), cooling device (5), separator (6), emission-control equipment (7), finished bin
(8), chimney (9) and hygrosensor (10), wherein raw material cabin (1) are fed by conveying equipment and air-flow preheating furnace (2) bottom
Mouth is connected, and air-flow preheating furnace (2) discharge port is connected with the feed inlet at the top of spiral flow calcinator (3), spiral flow calcinator (3) bottom
Discharge port is connected with the hot side feed inlet of cooling device (5), and the cold side discharge port of cooling device (5) is upper with separator (6)
Portion's feed inlet is connected, and the top gas outlet of separator (6) is connected with the air inlet of emission-control equipment (7), exhaust-gas treatment dress
The gas outlet for setting (7) is connected with chimney (9), and the bottom discharge mouth of separator (8) passes through conveying equipment and finished bin (8) phase
Even.
In above-mentioned apparatus, screw conveyor (11), bucket elevator (12), feeding bin are equipped between raw material cabin and air-flow preheating furnace
(13), quantitative feeding serew machine (14), raw material is sent by screw conveyor and bucket elevator to feeding bin, then passes through feeding bin bottom
Quantitative feeding serew machine send to preheating in air-flow preheating furnace.
In above-mentioned apparatus, air-flow preheats furnace bottom and is equipped with combustion chamber, and combustion chamber is by a set of combustion system heat supply.
In above-mentioned apparatus, spiral flow calcinator is equipped with three sets of combustion systems, be located at the top of spiral flow calcinator, middle part and
Bottom makes the temperature in spiral flow calcinator can guarantee uniformity.
In above-mentioned apparatus, the cooling device (5) is double pipe heat exchanger, by air blower (51) by cold wind from heat exchanger
Cold side is blown into, and the hot-air after heat exchange provides heat to four sets of combustion systems respectively after the effusion of heat exchanger hot side by air hose
Wind carries out UTILIZATION OF VESIDUAL HEAT IN.
In above-mentioned apparatus, the separator (6) is rotoclone collector, by rotoclone collector by MgO powder after cooling
Gas solid separation is carried out with the mixture of gas, the MgO powder to get off is collected and is sent into finished bin, cyclone dust collection from rotoclone collector bottom
The gas being discharged at the top of device is divided into two-way through system fan, and a routing return fan is sent more than the heating system to air-flow preheating furnace carries out
Heat utilization, after a routing is located at the bag filter dedusting of finished product silo roof, then through smoke stack emission.
In above-mentioned apparatus, the emission-control equipment (7) is bag filter, the dust-laden that will first be isolated in separator
After tails dedusting, then pass through smoke stack emission.To ensure to be less than the temperature in use of cloth bag into the gas temperature of bag filter,
Cold blast sliding valve is housed at bag filter entrance air hose.
In above-mentioned apparatus, for the dust concentration for reducing in production process, roof scrubber (15) is equipped at the top of raw material cabin,
Roof scrubber (81) is equipped at the top of finished bin.
In above-mentioned apparatus, to accurately control calcination temperature, in the entrance of spiral flow calcinator, middle part and exit and gas
It flows the entrance of preheating furnace and exit is equipped with temperature control detector, and by the combustion system at temperature data and each position
Gas quantity data carry out coordinated signals by computer system, to ensure the stability of calcination temperature.
It is described below by the technological process for producing high activity MgO Application Examples to the calciner using the present invention,
The roasting technique of the present invention is further elaborated.
It is using apparatus of the present invention production high activity MgO roasting techniques：
The magnesium carbonate powder handled well is sent by conveying equipment to raw material cabin and is stored, is stored in raw material cabin powder by spiral
Conveyer, bucket elevator are sent to feeding bin, then are sent by quantitative feeding serew machine to being preheated in air-flow preheating furnace.It is preheated in air-flow
In stove, magnesium carbonate powder contacts mixed from air-flow preheating furnace bottom feeding with the hot wind come from air-flow preheating furnace heating system
Close, absorb heat, temperature of charge is made to be preheated to about 350 DEG C, the control of preheating heater outlet temperature at 350 DEG C, temperature and preheating furnace
The gas consumption of combustion system carries out coordinated signals by computer system.Preheated magnesium carbonate powder and hot gas are from air-flow
Preheating furnace top discharge mouth escapes, and enters spiral flow calcinator by the feed inlet at the top of spiral flow calcinator, magnesium carbonate is forged in eddy flow
It is calcined in burning, calcining furnace is equipped with three sets of combustion systems, is located at the top, middle part and bottom of calcining furnace, makes calcining
Temperature in stove can guarantee uniformity, and magnesium carbonate is made to resolve into MgO and CO at a constant temperature2, MgO and CO2Gas is by forging
Burn the lower part discharge of stove.To accurately control calcination temperature, in the entrance of spiral flow calcinator, middle part and exit and air-flow
The entrance of preheating furnace and exit are equipped with temperature control detector, and by the combustion of temperature data and the combustion system at each position
Tolerance data carry out coordinated signals by computer system, to ensure the stability of calcination temperature.MgO and CO2The mixing of gas
Object is sent to double pipe heat exchanger by pipe-line system, and in the cold side of casing type heat exchanging, preheating furnace and calcining furnace are burnt by air blower
The combustion air heating that system needs, after so that the high-temperature gas containing MgO powder is down to about 200 DEG C, is sent in rotoclone collector, will
MgO powder is collected, then is delivered to MgO finished bins by air-flow.The gas of rotoclone collector discharge is divided into two after system fan
Road, a routing return air fan send the heating system to air-flow preheating furnace to carry out UTILIZATION OF VESIDUAL HEAT IN, and a routing is positioned at MgO finished product silo roofs
After bag filter dedusting, then through dedusting fan importing smoke stack emission, collects the MgO powder to get off and fall directly into MgO finished bins.
Cold blast sliding valve is housed, to ensure that the gas temperature into sack cleaner uses temperature less than cloth bag at bag filter entrance air hose
Degree.
Claims (12)
1. a kind of high activity MgO roasting techniques, which is characterized in that magnesium carbonate powder is first contacted into mixing with hot wind, absorbs heat,
So that temperature of charge is preheated to about 350 DEG C, then calcined through eddy flow, be calcination into 800 DEG C~1000 DEG C temperature ranges MgO and
CO2Mixture, MgO and CO after cooling2Mixture enters separator and realizes Conveyance, collects the powder to get off and enters into
Product storehouse stores, and the exhaust gas of effusion through chimney is discharged into air after being handled by emission-control equipment.
2. it is pre- according to the method described in claim 1, it is characterized in that, the magnesium carbonate powder contacts mixing with hot wind
It is carried out in hot stove.Magnesium carbonate powder is first preheated into furnace bottom feeding from air-flow by conveying equipment, mixing is contacted with hot wind, is absorbed
Heat makes magnesium carbonate powder be preheated in air-flow preheating furnace, and preheated magnesium carbonate powder preheats furnace roof with hot gas from air-flow
Portion's discharge port effusion.
3. according to the method described in claim 1, it is characterized in that, the eddy flow calcining be to be carried out in spiral flow calcinator, lead to
The feed inlet crossed at the top of spiral flow calcinator enters spiral flow calcinator, magnesium carbonate carry out being calcination into eddy flow calcining MgO and
CO2Mixture.
4. according to the method in claim 2 or 3, which is characterized in that accurately control calcination temperature, in spiral flow calcinator
The entrance and exit of entrance, middle part and exit and air-flow preheating furnace are equipped with temperature control detector, and will be warm
The gas quantity data of degrees of data and the combustion system at each position carry out coordinated signals by computer system, to ensure calcination temperature
Stability.
5. according to the method described in claim 1, it is characterized in that, playing heat effect in the preheating furnace and spiral flow calcinator
Combustion system, combustion system is located in four channels, and one of channel is located at preheating furnace lower part, and main rise preheats magnesium carbonate
The effect of raw meal powder, the distribution of the other three channel play calcining and decomposing magnesium carbonate raw material positioned at the upper, middle and lower three of spiral flow calcinator
The effect of powder, the hot-air generated in cooling are sent to the combustion fan inlet of combustion system by air hose and carry out UTILIZATION OF VESIDUAL HEAT IN.
6. according to the method described in claim 1, it is characterized in that, gas material mixture is defeated using the flow delivery systems with pipeline
It send and is leaked with reducing dust, and roof scrubber is equipped with to reduce dust emission concentration in the silo roof of raw material cabin and finished bin.
7. the dedicated unit of the high activity MgO roasting techniques described in claim 1, which is characterized in that
At raw material cabin, air-flow preheating furnace, spiral flow calcinator, multichannel combustion system, cooling device, separator, exhaust gas
Device, finished bin, chimney and hygrosensor are managed,
Wherein raw material cabin preheats furnace bottom feed inlet with air-flow by conveying equipment and is connected, and air-flow preheating furnace discharge port is forged with eddy flow
The feed inlet for burning furnace roof portion is connected, and the discharge port of spiral flow calcinator bottom is connected with the hot side feed inlet of cooling device, cooling dress
The cold side discharge port set is connected with the upper feed inlet of separator, the top gas outlet of separator and emission-control equipment
Air inlet is connected, and the gas outlet of emission-control equipment is connected with chimney, the bottom discharge mouth of separator by conveying equipment and
Finished bin is connected.
8. dedicated unit according to claim 7, which is characterized in that be equipped with spiral transferring between raw material cabin and air-flow preheating furnace
Machine, bucket elevator, feeding bin, quantitative feeding serew machine are sent, the magnesium carbonate component in raw material cabin first passes through screw conveyor and bucket carries
Machine is sent to feeding bin, then is sent by the quantitative feeding serew machine of feeding bin bottom to preheating in air-flow preheating furnace.
9. dedicated unit according to claim 7, which is characterized in that air-flow preheats furnace bottom and is equipped with combustion chamber, combustion chamber
By a set of combustion system heat supply.
10. dedicated unit according to claim 7, which is characterized in that spiral flow calcinator is equipped with three sets of combustion systems, respectively
Positioned at the top, middle part and bottom of spiral flow calcinator, the temperature in spiral flow calcinator is made to can guarantee uniformity.
11. dedicated unit according to claim 7, which is characterized in that the cooling device is double pipe heat exchanger, eddy flow
Gas material mixture in calcining furnace after calcining and decomposing is entered by bottom discharge mouth in heat exchanger, and cold wind is cold from heat exchanger through air blower
It is side-blown enter, hot-air after heat exchange gives four sets of combustion systems offer hot winds respectively after the effusion of heat exchanger hot side by air hose,
Carry out UTILIZATION OF VESIDUAL HEAT IN.
12. dedicated unit according to claim 7, which is characterized in that the separator is rotoclone collector, passes through rotation
Wind dust-precipitator is by MgO powder after cooling and CO2The mixture of gas carries out gas solid separation, collects the MgO powder to get off and is received from whirlwind
Finished bin is sent into dirt device bottom, and the gas being discharged at the top of rotoclone collector is divided into two-way through system fan, and a routing return fan is sent
Heating system to air-flow preheating furnace carries out UTILIZATION OF VESIDUAL HEAT IN, and a routing is after the bag filter dedusting of finished product silo roof, then passes through
Smoke stack emission；
In the bag filter, first by after the dust-containing tail gas dedusting isolated in separator, then pass through smoke stack emission.It is true
The temperature in use for being less than cloth bag into the gas temperature of bag filter is protected, cold wind is housed at bag filter entrance air hose
Valve.
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Application publication date: 20180904 |