CN102674716B - Cyclic calcining and decomposing process for powdered materials - Google Patents
Cyclic calcining and decomposing process for powdered materials Download PDFInfo
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- CN102674716B CN102674716B CN2012101508093A CN201210150809A CN102674716B CN 102674716 B CN102674716 B CN 102674716B CN 2012101508093 A CN2012101508093 A CN 2012101508093A CN 201210150809 A CN201210150809 A CN 201210150809A CN 102674716 B CN102674716 B CN 102674716B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Abstract
The invention discloses a cyclic calcining and decomposing process for powdered materials. The cyclic calcining and decomposing process comprises the following steps that: fine materials (water content: less than 2%, and particle size: less than 5 mm) are fed into a combustion chamber to be heated through a pre-heating pipeline from a raw material inlet pipeline, and then the fine materials are brought to a calcining and decomposing pipeline to be calcined and decomposed by a heat airflow, thereby obtaining products meeting the requirements; the airflow and the materials are separated in a cyclone cylinder, and the materials are discharged downwards through a discharge outlet (at the bottom of the cyclone cylinder) and a first air-lock discharge device, then the discharged materials are fed into second and third air-lock discharge devices through a three-way pipe; when the second air-lock discharge device is running, the materials are completely fed into a secondary air pipe, and brought to a cooling cyclone cylinder by an airflow to be separated with the airflow, then the airflow is fed into the combustion chamber through the raw material inlet pipeline and the preheating pipeline, and the materials are discharged from the bottom of the cooling cyclone cylinder; and when the third air-lock discharge device is running, the materials are completely fed into the preheating pipeline through the third air-lock discharge device and then subjected to cyclic calcining and decomposing again. According to the process disclosed by the invention, the effective utilization of ore resources is greatly improved, the equipment is simple, and qualified products can be produced stably.
Description
Technical field
The present invention relates to the powder calcining technology, particularly a kind of powder-material circulation calcining and decomposing technology.
Background technology
The mode of production of powder-material (as: powdery CaO, powdery CaOMgO, powdery MgO) all is to obtain by the block material of the macrobead of calcining is carried out fragmentation at present, just earlier go out oarse-grained block material by device fabrications such as rotary kiln, sleeve kiln, shaft furnaces, obtain meeting the powder-material that operation down requires thereby give broken and screening by all kinds of disintegrating apparatus again.This type of method of obtaining powder-material has following shortcoming:
1, its production unit is not to design at powdery unslaked lime specially, therefore also needs follow-up broken process to be replenished, and its process energy consumption is often higher, and has consumed valuable bulk material resource;
2, equipment such as rotary kiln, sleeve kiln, shaft furnace can only use larger particles as raw material, can't use the fine particle material as raw material, and can produce a large amount of fine particle material in the process of mining, transportation and ore dressing, so raw material resources can't obtain fully effectively utilizing.
In addition, the technology that also has a kind of device to adopt the multistage cyclone tube to be in series no doubt has the sufficient advantage of preheating but exists the shortcoming of system complex equally.Also have a kind of technology can only make material one-way movement in system, its calcination time relative fixed, rate of decomposition can't further improve
Summary of the invention
The object of the present invention is to provide a kind of powder-material circulation calcining and decomposing technology, make valuable lumpy material can bring into play bigger effect, less energy-consumption, improved the effective utilization to ore resource greatly, some fines that produce in mining, transportation, screening process can be fully utilized; And equipment is simple, has guaranteed that material can obtain maximum decomposition heat in system; Can stably produce qualified product.
For achieving the above object, technical scheme of the present invention is:
A kind of powder-material circulation calcining and decomposing technology, with water content less than 2%, granularity enters combustion chamber from the feed(raw material)inlet pipeline by preheating pipe less than the fine of 5mm and is heated, and brought into the calcining and decomposing pipeline by hot gas flow from bottom to top, material is obtained satisfactory product by calcining and decomposing in this process; After air-flow entered the whirlwind tube with material, air-flow and material were separated in the whirlwind tube, and the exhaust duct that air-flow upwards enters whirlwind tube top enters atmosphere; Material is then discharged downwards by whirlwind tube bottom discharge gate and the first lock gas dumping device, enters second, third lock gas dumping device by Y-tube, second, third lock gas dumping device interlocking; When the second lock gas dumping device operation and the 3rd lock gas dumping device when stopping, material all enters the secondary air channel that is connected in cooling whirlwind tube inlet pipeline from the second lock gas dumping device, brought in the cooling whirlwind tube by air-flow then, in cooling whirlwind tube, carry out separating of air-flow and material, air-flow enters the combustion chamber by feed(raw material)inlet pipeline, preheating pipe, material is discharged downwards from cooling whirlwind tube bottom discharge gate and the 4th lock gas dumping device, enter screening plant, be delivered to feed bin by e Foerderanlage again; When the 3rd lock gas dumping device operation and the second lock gas dumping device when stopping, the material calcining and decomposing that after the 3rd lock gas dumping device all enters preheating pipe, circulates again; Regulate different blanking amounts by the travelling speed of controlling second, third lock gas dumping device during operation, obtain the product of high de-agglomeration rate to satisfy the demands;
In the said process, air-flow enters cooling whirlwind tube, preheating pipe, combustion chamber, calcining and decomposing pipeline, whirlwind tube and exhaust duct successively from secondary air channel, forms the negative pressure recycle system;
Wherein, described cooling whirlwind tube upcast internal pressure is-5～-18mbar, temperature is controlled at 300 ~ 800 ℃, and flow rate control is at 5 ~ 15 meter per seconds;
Described calcining and decomposing manifold pressure is-10 ~-25mbar, flow rate control is at 8 ~ 20 meter per seconds, and temperature is controlled at 1000 ~ 1200 ℃;
Described whirlwind tube upcast internal pressure is-15～-30mbar, flow rate control is at 8 ~ 25 meter per seconds, and temperature is controlled at 500 ~ 700 ℃.
Further, the pressure that described preheating pipe enters combustion chamber place is-10 ~-20mbar, flow rate control is at 8 ~ 15 meter per seconds, and temperature is controlled at 600 ~ 900 ℃.
Also establish one in the airflow line of secondary air channel of the present invention and can prevent the tremie pipe of secondary air channel putty, and by screening plant, be delivered to feed bin by e Foerderanlage more again.
Have again, establish blower fan in the secondary air channel of the present invention, by the quantitative air inlet of blower fan.
In addition, the heating burner is established in described combustion chamber.
Air-flow of the present invention has following characteristics:
Air routing system negative pressure natural inflow, or by the quantitative air inlet of blower fan.
If natural inflow, then have the simple non-maintaining characteristics of equipment, but owing to be natural inflow, so air inlet can not be quantitative, thus system's " empty coal than " to keep more air surplus with guarantee gas-fired fully.
If the quantitative air inlet of blower fan then requires the blast inlet seal for pipe joints will get well the environmental pollution of avoiding local malleation to cause.In addition, because the longer middle-chain of airflow passes distance is more, therefore the system-wide control of leaking out is had relatively high expectations.Owing to powder-material is followed air-flow and moved, so its calcining and decomposing has in short-term characteristics fast, obtains the characteristics that effective calcining and decomposing system airflow will keep " low flow velocity " so will guarantee raw material.
Flow direction of material one of the present invention is: the feed(raw material)inlet → combustion chamber → calcining and decomposing pipeline → whirlwind tube → first lock gas dumping device → second lock gas dumping device → secondary air channel → cooling whirlwind tube → the 4th lock gas dumping device → screening plant → e Foerderanlage, last feeding warehouse.
Flow direction of material two is: the feed(raw material)inlet → combustion chamber → calcining and decomposing pipeline → whirlwind tube → first lock gas dumping device → the 3rd lock gas dumping device → preheating pipe → combustion chamber → calcining and decomposing pipeline → whirlwind tube → first lock gas dumping device → second lock gas dumping device → secondary air channel → cooling whirlwind tube → the 4th lock gas dumping device → screening plant → e Foerderanlage, last feeding warehouse.
Wherein " the first lock gas dumping device → the 3rd lock gas dumping device → preheating pipe → combustion chamber → calcining and decomposing pipeline → whirlwind tube → first lock gas dumping device " is the circulation calcining and decomposing process of material.
The present invention compared with prior art has following beneficial effect:
1. do not use the good lumpy material of calcining as raw material, make valuable lumpy material can bring into play bigger effect.
2. compare the lumpy material fragmentation is obtained powdery unslaked lime technology, the present invention has lower unit consumption of energy.
3. improved the effective utilization to ore resource greatly, some fines that produce in mining, transportation, screening process can be fully utilized.
4. compare original powder calcining technology, present device is simple, only designs a whirlwind tube and a cooling whirlwind tube; Raw material enters and is arranged in the burner place, has guaranteed that material can obtain maximum decomposition heat in system.
5. two lock gas dumping device are set under whirlwind tube lock gas dumping device again, lead to secondary air pipeline and preheating pipe respectively, and the material that leads to preheating pipe will can be adjusted the material ratio of circulation calcining and decomposing according to the rate of decomposition of product by calcining and decomposing again in the production operation.
6. pulverulent material calcining process of the present invention can be produced and meets necessarily required pulverulent material (as: powdery CaO, powdery CaOMgO, powdery MgO) material and use for the user.
Description of drawings
Fig. 1 is the synoptic diagram of the embodiment of the invention.
Embodiment
Referring to Fig. 1, a kind of powder-material circulation calcining and decomposing technology of the present invention, after the fine (granularity is generally less than 5mm) of water content lower (less than 2%) enters combustion chamber 3 from feed(raw material)inlet pipeline 1 by preheating pipe 2, namely entered and be heated the high temperature gas flow heating that burner 31 produces, and brought into calcining and decomposing pipeline 4 by hot gas flow from bottom to top, in the calcining and decomposing pipeline 4 (B point) pressure be-10 ~-25mbar, flow rate control is at 8 ~ 20 meter per seconds, 1000 ~ 1200 ℃ of temperature, material is obtained satisfactory product by calcining and decomposing in this process.
Air-flow is after material enters whirlwind tube 5, air-flow and material are separated in whirlwind tube 5, air-flow upwards enters the exhaust duct 6 at whirlwind tube 5 tops by upcast, whirlwind tube 5 upcast internal pressures are-15～-30mbar, flow rate control is at 8 ~ 25 meter per seconds, 500 ~ 700 ℃ of temperature (A point), and further by equipment such as cooling tower, sack cleaner and induced draft fans air-flow is entered atmosphere; Material then by discharging by whirlwind tube 5 bottom discharging mouths 51 and the first lock gas dumping device 7, enters the second lock gas dumping device 7 ' and the 3rd lock gas dumping device 7 by Y-tube 8 downwards ", second, third lock gas dumping device interlocking.
When the 7 ' operation of the second lock gas dumping device and the 3rd lock gas dumping device 7 " when stopping; material all enters the secondary air channel 11 that is connected in cooling whirlwind tube 9 inlet pipelines from the second lock gas dumping device 7 '; brought in the cooling whirlwind tube 9 by air-flow then; cooling whirlwind tube 9 upcasts (D point) internal pressure is-5～-18mbar; 300 ~ 800 ℃ of temperature, flow rate control is at 5 ~ 15 meter per seconds; In cooling whirlwind tube 9, carry out separating of air-flow and material, air-flow enters combustion chamber 3 by feed(raw material)inlet pipeline 1, preheating pipe 2, and material is discharged downwards from the 4th lock gas dumping device 10 of cooling whirlwind tube 9 bottoms, enters screening plant 12, again by e Foerderanlage 13, last feeding warehouse.
Because the second lock gas dumping device 7 ' and the 3rd lock gas dumping device 7 " what discharge is high-temperature material; and therefore the gas flow temperature that enters from secondary air channel 11 is heated by these materials; the temperature when it enters preheating pipe 2 in the preheating pipe is higher, and the air-flow of these comparatively high tempss can be used for the outside low-temperature material that drops into of preheating.
When the 3rd lock gas dumping device 7 " when operation and the second lock gas dumping device 7 ' stopped, material was from the 3rd lock gas dumping device 7 " calcining and decomposing again circulates after all entering preheating pipe 2; Can be by the control second lock gas dumping device 7 ' and the 3rd lock gas dumping device 7 during operation " travelling speed regulate different blanking amounts, purpose is to obtain the product of high de-agglomeration rate to satisfy the demands; The pressure that preheating pipe 2 enters 3 places, combustion chamber (C point) is-10～-20mbar, flow rate control is at 8 ~ 15 meter per seconds, and temperature is controlled at 600 ~ 900 ℃.
In the said process, air-flow enters under the situation of cooling whirlwind tube 9, preheating pipe 2, combustion chamber 3, calcining and decomposing pipeline 4, whirlwind tube 5 and exhaust duct 6 successively from secondary air channel 11, forms the negative pressure recycle system.
Further, also establish one in the airflow line of described secondary air channel 11 and can prevent the tremie pipe 14 of secondary air channel 11 putties, and pass through screening plant 16 to e Foerderanlage 13.
In addition, the all right blower fan 15 quantitative air feed of air-flow, bring secondary air channel 11 into, enter in the cooling whirlwind tube 9, enter preheating pipe 2 again, after enter combustion chamber 3, enter calcining and decomposing pipeline 4 then, enter whirlwind tube 5 and exhaust duct 6 again, further by equipment such as cooling tower, sack cleaner and induced draft fans air-flow is entered atmosphere.
The present invention can be widely used in industries such as metallurgy lime, anti-material, particularly has the enterprise of large-sized rotary kiln, shaft furnace, sleeve kiln plant, because these stoves often have a large amount of fines to produce.As long as stable particulate and coal gas or coal dust supply are arranged, just can use the present invention, it can make those fines that are difficult to utilize become can be for the pulverulent material of user's use.
Claims (4)
1. powder-material circulation calcining and decomposing technology, with water content less than 2%, granularity enters combustion chamber from the feed(raw material)inlet pipeline by preheating pipe less than the fine of 5mm and is heated, and brought into the calcining and decomposing pipeline by hot gas flow from bottom to top, material is obtained satisfactory product by calcining and decomposing in this process; After air-flow entered the whirlwind tube with material, air-flow and material were separated in the whirlwind tube, and the exhaust duct that air-flow upwards enters whirlwind tube top enters atmosphere; Material is then discharged downwards by whirlwind tube bottom discharge gate and the first lock gas dumping device, enters second, third lock gas dumping device by Y-tube, second, third lock gas dumping device interlocking; When the second lock gas dumping device operation and the 3rd lock gas dumping device when stopping, material all enters the secondary air channel that is connected in cooling whirlwind tube inlet pipeline from the second lock gas dumping device, brought in the cooling whirlwind tube by air-flow then, in cooling whirlwind tube, carry out separating of air-flow and material, air-flow enters the combustion chamber by feed(raw material)inlet pipeline, preheating pipe, material is discharged downwards from cooling whirlwind tube bottom discharge gate and the 4th lock gas dumping device, enter screening plant, be delivered to feed bin by e Foerderanlage again; When the 3rd lock gas dumping device operation and the second lock gas dumping device when stopping, the material calcining and decomposing that after the 3rd lock gas dumping device all enters preheating pipe, circulates again; Regulate different blanking amounts by the travelling speed of controlling second, third lock gas dumping device during operation, obtain the product of high de-agglomeration rate to satisfy the demands;
In the said process, air-flow enters cooling whirlwind tube, preheating pipe, combustion chamber, calcining and decomposing pipeline, whirlwind tube and exhaust duct successively from secondary air channel, forms the negative pressure recycle system;
Wherein, described cooling whirlwind tube upcast internal pressure is-5～-18mbar, temperature is controlled at 300～800 ℃, and flow rate control is at 5～15 meter per seconds;
The pressure that described preheating pipe enters combustion chamber place is-10～-20mbar, flow rate control is at 8～15 meter per seconds, and temperature is controlled at 600～900 ℃;
Described calcining and decomposing manifold pressure is-10～-25mbar, flow rate control is at 8～20 meter per seconds, and temperature is controlled at 1000～1200 ℃;
Described whirlwind tube upcast internal pressure is-15～-30mbar, flow rate control is at 8～25 meter per seconds, and temperature is controlled at 500～700 ℃.
2. powder-material circulation calcining and decomposing technology as claimed in claim 1 is characterized in that, also establishes one in the airflow line of described secondary air channel and can prevent the tremie pipe of secondary air channel putty, and by screening plant, be delivered to feed bin by e Foerderanlage again.
3. powder-material circulation calcining and decomposing technology as claimed in claim 1 or 2 is characterized in that, establishes blower fan in the described secondary air channel, by the quantitative air inlet of blower fan.
4. powder-material circulation calcining and decomposing technology as claimed in claim 1 is characterized in that the heating burner is established in described combustion chamber.
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| CN102674716B true CN102674716B (en) | 2013-09-04 |
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| CN105347704B (en) * | 2015-12-03 | 2017-10-27 | 洛阳建材建筑设计研究院有限公司 | A kind of production method of oil shale tailing particles suspension lime kiln |
| CN111251491B (en) * | 2018-12-03 | 2022-02-22 | 宁波优禾新材料科技有限公司 | A equipment for masterbatch production |
| CN111792855B (en) * | 2020-08-20 | 2024-01-30 | 辽宁博仕科技股份有限公司 | Straight barrel type light-burned magnesia suspension roasting device |
| CN114851433B (en) * | 2022-04-26 | 2023-03-24 | 四川绵阳兴合益新材料科技有限公司 | Solid-waste separation and recovery method for suspension polymerization expandable polystyrene |
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|---|---|---|---|---|
| CN101570405A (en) * | 2009-06-09 | 2009-11-04 | 宝山钢铁股份有限公司 | Method for removing formed ring of rotary kiln under high temperature by using forsterite and sodium silicate |
| CN101921072A (en) * | 2009-06-09 | 2010-12-22 | 宝山钢铁股份有限公司 | Method for removing ring formation of rotary kiln for active lime calcination |
| CN101921071A (en) * | 2009-06-09 | 2010-12-22 | 宝山钢铁股份有限公司 | Method for removing formed ring in rotary kiln coal powder injection |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101570405A (en) * | 2009-06-09 | 2009-11-04 | 宝山钢铁股份有限公司 | Method for removing formed ring of rotary kiln under high temperature by using forsterite and sodium silicate |
| CN101921072A (en) * | 2009-06-09 | 2010-12-22 | 宝山钢铁股份有限公司 | Method for removing ring formation of rotary kiln for active lime calcination |
| CN101921071A (en) * | 2009-06-09 | 2010-12-22 | 宝山钢铁股份有限公司 | Method for removing formed ring in rotary kiln coal powder injection |
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