CN1283856C - Polyacrylonitrile precursor fluidized pre-oxidation furnace - Google Patents
Polyacrylonitrile precursor fluidized pre-oxidation furnace Download PDFInfo
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- CN1283856C CN1283856C CN 200510043259 CN200510043259A CN1283856C CN 1283856 C CN1283856 C CN 1283856C CN 200510043259 CN200510043259 CN 200510043259 CN 200510043259 A CN200510043259 A CN 200510043259A CN 1283856 C CN1283856 C CN 1283856C
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Abstract
The present invention relates to a novel fluidized preoxidation furnace for polyacrylonitrile raw yarn, which is composed of a wind distribution chamber, a fluidizing bed, an electric heating system, a pressurized air sealing cabin, a cyclone separator, a speed-regulation driving system, etc. Spherical particle active carbon, silica gel and an Al2O3 fluidizing medium are used for carrying out heat and mass transfer reaction, and the preoxidization treatment effect of the polyacrylonitrile carbon fiber is enhanced. The present invention has the advantages of high temperature rising speed, good temperature stability, high preoxidization speed, short preoxidization time, etc.
Description
Technical field
The invention belongs to the Carbon Fiber Technology field, be specially adapted to the pre-oxidation treatment of polyacrylonitrile fibril.
Background technology
In the production process of polyacrylonitrile-based carbon fibre, polyacrylonitrile fibril makes pre-oxygen silk through pre-oxidation, makes carbon fiber through charing again.Wherein pre-oxidation is a very important process, this is not only because complicated physics and chemical change take place in this process precursor, be a heat transfer and the coefficient process of mass transfer, and be accompanied by the variation of forming structure and thermomechanical property, the quality of direct relation carbon fiber, and pre-oxidation is in overall process, and the shared time is the longest, energy consumption is maximum, in carbon fiber production process, pre-oxidation is the key factor that the restriction carbon fiber is produced.Shorten preoxidation time, just can the corresponding raising output and the cost that cuts down the consumption of energy.Preoxidation process is an exothermal reaction process, the instantaneous reaction heat of draining is the key point that shortens preoxidation time, because accumulation of heat, overheated meeting cause and melt between the single fiber also, fracture of wire takes place when serious, even cause fire, when particularly producing large-tow carbon fiber, the instantaneous reaction heat of taking away seems even more important.
The pre-oxidation type of furnace mainly contains two kinds both at home and abroad at present, and a kind of is the orthoscopic pre-oxidation furnace, and second kind is the heated air circulation type pre-oxidation furnace.The orthoscopic pre-oxidation furnace adopts hot blast directly to heat polyacrylonitrile fibril, individual layer wire in the stove, and this type of furnace is simple, and the thermal efficiency is lower; The heated air circulation type pre-oxidation furnace adopts circulating air heating polyacrylonitrile fibril, to-and-fro thread in the stove, and type of furnace complexity, the thermal efficiency is higher.More than two kinds of type of furnaces all adopt gas-gas heat transfer type, though the heat and mass effect can satisfy process requirements, the process time is long, temperature homogeneity is low.
Summary of the invention
Polyacrylonitrile precursor fluidized pre-oxidation furnace of the present invention, its purpose are to solve that conventional polypropylene nitrile pre-oxidation furnace energy consumption is big, and temperature control precision is not high, and pre-oxidation speed is slow, production efficiency is low wait not enough.
Fluidization technology is research and the multiphase flow technology of handling mixing between mutually of solid particle and gas phase, liquid phase, gas-liquid in the industrial process, mass transfer, heat transfer, is solid particle shows similar fluid state under the fluid effect a kind of phenomenon.Characteristics such as the present invention utilizes the interaction between the particle and fluid in the fluidization operating process, and temperature is even in heat transfer, mass transfer, the bed are to reach the harsh requirement that solves the polyacrylonitrile fibril pre-oxidation process.
Polyacrylonitrile precursor fluidized pre-oxidation furnace of the present invention, divide device, air distribution plate, fluidization medium, cyclone separator, pressurization cabin, transmission mechanism etc. to form by body of heater, pre-cloth, it is characterized by: body of heater is welded by steel sheet material, inner fill insulant material, furnace chamber inside is divided into air compartment and fluid bed two parts by air distribution plate.The furnace chamber bottom is an air compartment, and the air compartment bottom is provided with between pre-ventilation terminal, pre-ventilation terminal and air distribution plate and is provided with heating element heater.Air distribution plate top is fluid bed, the inner fluidization medium of filling, and the fluidized gas at furnace chamber top is collected mouth, is connected to cyclone separator and exhaust outlet by pipeline, and furnace chamber two is provided with the wire mouth, wire mouth arranged outside pressurization cabin.
The fluidization medium of polyacrylonitrile precursor fluidized pre-oxidation furnace of the present invention is the globular solids particle, and they are Al
2O
3Hollow ball, activated carbon granule and silica gel particle.The diameter of solid particle diameter is 0.5mm-4.0mm, and these three kinds of particles both can use separately, also can mix use arbitrarily.These particles form fluid bed under the blowing of fluidizing gas, finish the pre-oxidation treatment of polyacrylonitrile fibril.
Polyacrylonitrile precursor fluidized pre-oxidation furnace of the present invention, the pre-ventilation terminal of furnace chamber bottom adopts double layer jacket structure, its architectural feature is that interior cover is the heat resisting pipe of closed at both ends, uniform all around aperture, connect air inlet pipe at the middle part, overcoat is a rectangular structure, uniform air outlet on the top plan, air inlet pipe passes jacket bottom, the binding site welded seal.Fluidized gas enters before the fluid bed, earlier through pre-ventilation terminal even distributing wind, makes blast uniformity in the air compartment.
The air distribution plate of polyacrylonitrile precursor fluidized pre-oxidation furnace of the present invention adopts the plate armature form, and air distribution plate adopts heat-resisting steel sheet and plate, the isometrical aperture that evenly distributes on it, and small aperture is 0.4mm-2.0mm, percent opening satisfies even distributing wind pressure drop requirement.Fluidized gas forms even blast on the air distribution plate surface, guarantees that the fluid bed fluidization is even.
Description of drawings
Fluidized pre-oxidation stove of the present invention as shown in Figure 1, by transmission mechanism 1 and 8, pressurization cabin 2 and 7, body of heater 3, cyclone separator 4, fluidized gas is collected mouth 5, blast pipe 6, pre-ventilation terminal air inlet pipe 9, pressurization cabin air inlet pipe 9 ', fluidization medium 1O, air distribution plate 11, heating 12, pre-ventilation terminal 13, precursor 14 is formed.
The structure of pre-ventilation terminal as shown in Figure 2, by overcoat 15, interior cover 17, air inlet pipe 9 is formed, overcoat top end face has perforate 16, and perforate 18 is arranged around the interior cover.Interior cover aperture total sectional area summation is greater than overcoat aperture total sectional area.
The air distribution plate structure as shown in Figure 3, plate body is made by heat resisting steel, uniform isometrical through hole on it.
Fluidized pre-oxidation stove of the present invention is when work, and a compressed air part is fed by pre-ventilation terminal air inlet pipe 9, enters pre-ventilation terminal, and a part is fed by pressurization cabin air inlet pipe 9 ', enters the pressurization cabin.After entering the compressed air interior cover perforate 18 of process and overcoat perforate 16 of pre-ventilation terminal; it is even that compressed air pressure becomes; compressed air through homogenising is heated to predetermined temperature by heating 12; and then evenly enter fluid bed and serve as fluidizing gas through air distribution plate 11; under the blowing of fluidizing gas; 10 boilings of graininess fluidization medium; be in fluidized state; heating precursor 14; precursor 14 is driven by transmission mechanism 1 and 8; fluidizing gas is carried out heat and mass in furnace chamber after; waste gas from the fluidized gas at body of heater top collect mouthfuls 5 be aggregated into cyclone separator 4 and carry out gas-solid separation after; discharge via blast pipe 9, in dust or fragmentary particle melt down, avoid air pollution.The compressed air that enters pressurization cabin 2 and 7 through pressurization cabin air inlet pipe 9 ' forms gas shield, stops fluidization medium excessive.
The specific embodiment
Embodiment 1: carrying out pre-oxidation with the 12K polyacrylonitrile fibril is example, and manufacturing and application specific embodiments of the invention are as follows:
Utilize heat resisting steel tubing and sheet material welding boring, process pre-ventilation terminal.Interior cover size φ 100 * 1400, the φ 3 that holes all around amounts to 300; 1490 millimeters * 150 millimeters * 150 millimeters of overcoat sizes, end face boring φ 2 amounts to 300.
Utilize heat-resisting steel sheet and plate boring processing air distribution plate, 0.8 millimeter in aperture, 10 millimeters of thicknesss of slab, long 1498 millimeters of plate, plate is wide 198 millimeters, percent opening 1%.
Utilize steel plate and insulation material finishing stove body case, 1500 millimeters * 200 millimeters * 700 millimeters of body of heater inner chamber effective dimensions, at the body of heater intracavity bottom pre-ventilation terminal is installed, body of heater and the sealing of air inlet pipe outer wall, above pre-ventilation terminal, heating is installed, the end picks out body of heater and sealing, air distribution plate is installed, all around with body of heater inner chamber inner wall sealing above heating.Above air distribution plate, fill activated carbon granule, particle diameter 1.5-1.8 millimeter, height is installed cyclone separator with to advance silk mouthful concordant on furnace chamber top, a pressurization cabin is installed entering silk mouthful both sides.
When polyacrylonitrile fibril is carried out fluidized pre-oxidation, carry a pressure-air part of coming to enter pre-ventilation terminal by high pressure positive blower through pre-ventilation terminal air inlet, air process heating heating behind pre-ventilation terminal cloth wind in air distribution plate enters the fluidization furnace chamber, is blown activated carbon particles and is in fluidized state again.Another part pressure-air feeds the pressurization cabin at fire door two ends; the particle that prevents boiling in the stove is gushed out from the wire mouth; isolate granule or active carbon dust behind the cyclone separator of fluidizing gas process body of heater top; discharge through blast pipe, as the fluidized gas or the cold pressure-air of preheating of follow-up fluidized bed furnace.Polyacrylonitrile fibril is rapidly heated to the pre-oxidation temperature through fluid bed under transmission mechanism drives, the cracking gas of pre-oxidation is simultaneously taken away by fluidizing gas.
After pre-oxidation furnace processing of the present invention, polyacrylonitrile fibril is reaching under the prerequisite of identical oxygen content, preoxidation time is more over half than shortening heat time heating time of traditional hot blast heating pre-oxidation furnace, production efficiency is enhanced about more than once, and thus obtained carbon fiber strength is suitable with traditional pre-oxidation process gained result.
Embodiment 2: carrying out pre-oxidation with the 3K polyacrylonitrile fibril is example, and manufacturing and application specific embodiments of the invention are as follows:
Utilize heat resisting steel tubing and sheet material welding boring, process pre-ventilation terminal.Interior cover size φ 100 * 1900, the φ 3 that holes all around amounts to 500; 1990 millimeters * 150 millimeters * 150 millimeters of overcoat sizes, end face boring φ 2 amounts to 500.
Utilize heat-resisting steel sheet and plate boring processing air distribution plate, 1.5 millimeters in aperture, 10 millimeters of thicknesss of slab, long 1998 millimeters of plate, plate is wide 198 millimeters, percent opening 1.2%.
Utilize steel plate and insulation material finishing stove body case, 2000 millimeters * 200 millimeters * 700 millimeters of body of heater inner chamber effective dimensions, at the body of heater intracavity bottom pre-ventilation terminal is installed, body of heater and the sealing of air inlet pipe outer wall, above pre-ventilation terminal, heating is installed, the end picks out body of heater and sealing, air distribution plate is installed, all around with body of heater inner chamber inner wall sealing above heating.Above air distribution plate, fill Al
2O
3Hollow ball, particle diameter 3.5-3.8 millimeter, height is installed cyclone separator with to advance silk mouthful concordant on furnace chamber top, a pressurization cabin is installed entering silk mouthful both sides.Method according to embodiment one is used.
After pre-oxidation furnace processing of the present invention, the 3K polyacrylonitrile fibril is reaching under the prerequisite of identical oxygen content, preoxidation time shortens more than 2/5ths than traditional hot blast heating pre-oxidation furnace heat time heating time, and thus obtained carbon fiber strength is suitable with traditional pre-oxidation process gained result.
Claims (2)
1, a kind of polyacrylonitrile precursor fluidized pre-oxidation furnace, divide device, air distribution plate, fluidization medium, cyclone separator, pressurization cabin, transmission mechanism etc. to form by body of heater, pre-cloth, it is characterized by: body of heater is welded by steel sheet material, inner fill insulant material, furnace chamber inside is divided into air compartment and fluid bed two parts by air distribution plate.The furnace chamber bottom is an air compartment, and the air compartment bottom is provided with between pre-ventilation terminal, pre-ventilation terminal and air distribution plate and is provided with heating element heater.Air distribution plate top is fluid bed, the inner fluidization medium of filling, and the fluidized gas at furnace chamber top is collected mouth, is connected to cyclone separator and exhaust outlet by pipeline, and furnace chamber two is provided with the wire mouth, wire mouth arranged outside pressurization cabin.
2, according to claims 1 described novel polyacrylonitrile precursor fluidized pre-oxidation furnace, it is characterized by fluidization medium is the globular solids particle, and they are Al
2O
3Hollow ball, activated carbon granule and silica gel particle.The diameter of solid particle diameter is 0.5mm-4.0mm, and these three kinds of particles both can use separately, also can mix use arbitrarily.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510043259 CN1283856C (en) | 2005-04-21 | 2005-04-21 | Polyacrylonitrile precursor fluidized pre-oxidation furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510043259 CN1283856C (en) | 2005-04-21 | 2005-04-21 | Polyacrylonitrile precursor fluidized pre-oxidation furnace |
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| CN1676690A CN1676690A (en) | 2005-10-05 |
| CN1283856C true CN1283856C (en) | 2006-11-08 |
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| CN 200510043259 Expired - Fee Related CN1283856C (en) | 2005-04-21 | 2005-04-21 | Polyacrylonitrile precursor fluidized pre-oxidation furnace |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100347356C (en) * | 2006-02-21 | 2007-11-07 | 肖忠渊 | Dedicated gas-liquid device for carbon fibre production line |
| CN108787338A (en) * | 2018-09-11 | 2018-11-13 | 佛山市金银河智能装备股份有限公司 | A kind of unicoater |
| CN113952898B (en) * | 2021-11-24 | 2023-09-12 | 浙江迦南科技股份有限公司 | Fluidized bed capable of adjusting air quantity of air inlet |
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