CN104213254A - Device to improve temperature field uniformity of pre-oxidation furnace - Google Patents
Device to improve temperature field uniformity of pre-oxidation furnace Download PDFInfo
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- CN104213254A CN104213254A CN201410389172.2A CN201410389172A CN104213254A CN 104213254 A CN104213254 A CN 104213254A CN 201410389172 A CN201410389172 A CN 201410389172A CN 104213254 A CN104213254 A CN 104213254A
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- oxidation furnace
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Abstract
The invention discloses a device to improve the temperature field uniformity of a pre-oxidation furnace. The pre-oxidation furnace comprises a furnace body; the internal space of the furnace body comprises compartments located at the two ends and a pre-oxidation area located in the central part; air outlets and air inlets are arranged on the lateral wall of the furnace body corresponding to the compartments; each air inlet is respectively communicated with the pre-oxidation area through a pipeline; air inlet pipes connected with the air inlets and exhaust pipes connected with the air outlets are arranged out of the furnace body; and exhaust reusing pipes are connected between the side walls of the exhaust pipes and the side walls of the air inlet pipes. Under the wind suction effect of a fresh supplement blower fan, part of the exhaust in the exhaust pipes through the exhaust reusing pipes enters in the air inlet pipes, so as to reduce the escaping of exhaust from filament bundle inlet and outlet, and reduce exhaust quantity of the exhaust fan; the exhaust is the high temperature gas, part of the exhaust through the exhaust reusing pipes enters into the air inlet pipes, and is mixed with fresh air to increase the temperature of the fresh air entering the furnace body, so as to improve the temperature uniformity of pre-oxidation furnace field, and ensure uniformity and fiber performance quality in the oxidation process.
Description
Technical field
The present invention relates to carbon fiber and manufacture field, be specifically related to a kind of device improving pre-oxidation furnace temperature field uniformity.
Background technology
Carbon fiber is a kind of tec fiber material developed rapidly the sixties in 20th century.Due to its high specific strength, high ratio modulus, and extremely excellent heat-resisting, the performance such as chemical resistance, rub resistance, be thus used widely in fields such as Aero-Space, the contour leading-edge field of national defense industry and senior sports goods, medicine equipments.In recent years, along with carbon fiber is produced and the development of application technology and progress, the reduction of carbon fiber price, make carbon fibre composite also obtain new application & development in general industry field, will be used widely in fields such as wind-power electricity generation, electric power facility, field facility, automobiles.
PAN base carbon fibre has the excellent properties such as density is little, quality light, high specific strength, high ratio modulus, thermal coefficient of expansion are little, high temperature resistant, corrosion-resistant, is therefore widely used as the reinforcement of various advanced composite material.Need in its preparation process through techniques such as pre-oxidation, carbonization, surface treatment and starchings, wherein pre-oxidation is the important pilot process producing carbon fiber.Its object is to make PAN precursor linear molecule chain change into heat-resisting trapezoidal-structure, trapezoidal-structure pyrolysis in high temperature cabonization process, polycondensation are converted into the random graphits structure of carbon fiber.
Pre-oxidation furnace kind is more, can be divided into three kinds according to air inlet mode: lateral blowing formula, vertical flow type and central authorities are to two ends bleed type.Often kind of oxidation furnace has respective pros and cons, and lateral blowing formula pre-oxidation furnace air intake direction is vertical with tow, is conducive to chemical reaction Small molecular and heat to be taken away instantaneously, but when body of heater is wider in burner hearth air intake/output end have certain wind speed difference and the temperature difference; Vertical flow type pre-oxidation furnace from roof of the furnace air intake, thus ensure that tow surface wind speed uniformity, but when there is multilayer in stove internal thread road and tow gap reduces, hot blast is difficult to pass through between tow, causes reaction Small molecular and heat not easily to be taken away; Central authorities compare above-mentioned two kinds to two ends bleed type pre-oxidation furnace, and not only can ensure tow surface wind speed uniformity but also can take away heat of reaction instantaneously, therefore pre-oxidation efficiency improves 25% than lateral blowing formula.
All kinds of pre-oxidation furnace two ends all have the gateway by tow, and when pre-oxidation furnace normally works, due to furnace interior positive pressure environment, therefore quovis modo pre-oxidation furnace all inevitably passes through the gateway of tow to workshop discharging waste gas.As shown in Figure 1, in order to address this problem, many producers are by installing jacket space and compartment 8 additional at the two ends of the body of heater 3 of pre-oxidation furnace, and furnace interior space is divided into three parts, the compartment being namely positioned at two ends and the pre-oxidation region connected with two compartments.The top of each compartment is provided with waste discharge blower fan 4, and compartment can store waste gas, prevents waste gas from directly being discharged to workshop by the gateway of tow, and arranging waste discharge blower fan can detach away the waste gas in compartment.The two ends of body of heater are also provided with air inlet and new wind supplements blower fan, and air inlet is by pipeline and pre-oxidation regional connectivity.
Such design can obtain certain effect, but when pre-oxidation furnace operate power is comparatively large, running time still has portion and escapes into workshop through after compartment from the gateway of tow time longer, especially for the pre-oxidation furnace of central authorities to two lateral blowing modes, waste gas after pre-oxidation from body of heater discharged to compartment, waste discharge power of fan in top will significantly improve could reduce the effusion of waste gas to workshop, and this is invisible too increases energy consumption; And when supplementary new wind enters pre-oxidation region from body of heater two ends, room temperature is generally because new air temperature is lower, temperature in pre-oxidation region then has 100 degree, therefore causes pre-oxidation region two ends temperature and pre-oxidation intra-zone temperature field comparatively large, have impact on the effect of tow pre-oxidation.
Summary of the invention
The present invention is directed to the problems referred to above, propose a kind of device improving pre-oxidation furnace temperature field uniformity.Effectively can reduce the effusion of pre-oxidation furnace waste gas, reduce waste discharge amount, reduce the temperature difference of two ends, pre-oxidation region and pre-oxidation intra-zone simultaneously, improve body of heater temperature field uniformity.
The technical scheme that the present invention takes is as follows:
A kind of device improving pre-oxidation furnace temperature field uniformity, described pre-oxidation furnace comprises body of heater, the inner space of body of heater comprises the compartment that two lay respectively at body of heater two ends, and the pre-oxidation region to be connected with two compartments, sidewall of the furnace body and compartment corresponding position are provided with for the exhaust outlet of waste discharge and the air inlet for supplementing new wind, each air inlet by pipeline respectively with pre-oxidation regional connectivity, the outside of described body of heater is provided with the air inlet pipe be connected with described air inlet and the waste pipe be connected with exhaust outlet, exhaust gas utilization pipe is connected with between the sidewall of described waste pipe and the sidewall of air inlet pipe.
During pre-oxidation furnace work, tow successively passes through compartment, pre-oxidation region and another compartment, tow carries out oxidation reaction in pre-oxidation region, cause portion (lateral blowing formula oxidation furnace and vertical flow type oxidation furnace) or whole waste gas (central authorities are to both sides bleed type oxidation furnace) to enter compartment by silk road junction because furnace interior exists airflow circulating system, last waste gas is discharged by exhaust outlet.By arranging the exhaust gas utilization pipe being communicated with described waste pipe and air inlet pipe, portion can enter air inlet pipe by exhaust gas utilization pipe, and enters pre-oxidation region after mixing with new wind, and this effectively can reduce the effusion of waste gas, reduces waste discharge amount, effectively can reduce energy consumption; Simultaneously because waste gas has certain temperature, contribute to the raising of the temperature of the new wind sending pre-oxidation region to, reduce the temperature difference between pre-oxidation area end and pre-oxidation intra-zone, improve pre-oxidation furnace temperature field uniformity, ensure that pre-oxidized fibers quality and improve working (machining) efficiency; And this apparatus structure is simple, cost is low.
As preferably, described exhaust gas utilization pipe is provided with and controls the unimpeded or closed switching device of exhaust gas utilization pipe.
Exhaust gas utilization pipe can be controlled according to actual conditions by arranging switching device.
As preferably, described switching device is motor-driven valve or hand-operated valve.
Hand-operated valve Operation and Maintenance is simple, and motor-driven valve can realize Automated condtrol.
As preferably, described exhaust outlet is arranged on the upper end of sidewall of the furnace body.
As preferably, described air inlet is arranged on the lower end of sidewall of the furnace body.
Described air inlet pipe is provided with new wind and supplements blower fan.
Described waste pipe is provided with waste discharge blower fan.
In order to make more waste gas enter air inlet pipe, as preferably, one end of described exhaust gas utilization pipe is closed on new wind and is supplemented blower fan, and the other end closes on waste discharge blower fan.
Described pre-oxidation furnace is that lateral blowing formula oxidation furnace, vertical flow type oxidation furnace or central authorities are to both sides bleed type oxidation furnace.
The invention has the beneficial effects as follows:
1, reduce waste discharge amount: opened by switching device, under new wind supplements fan induced draught effect, the portion in waste pipe can be entered air inlet pipe by exhaust gas utilization pipe, this can reduce waste gas and to overflow from the gateway of tow, reduce the waste discharge amount of waste discharge blower fan.
2, oxidation furnace temperature field uniformity is improved: because waste gas is high-temperature gas, portion enters air inlet pipe through exhaust gas utilization pipe, the temperature of the new wind entering pre-oxidation region can be improved when mixing with new wind, thus the temperature difference reduced between pre-oxidation area end and pre-oxidation intra-zone, improve pre-oxidation furnace temperature field uniformity, ensure that pre-oxidized fibers quality and improve working (machining) efficiency.
Accompanying drawing illustrates:
Fig. 1 is the structural representation that prior art has the pre-oxidation furnace of compartment;
Fig. 2 is the front view that the present invention improves the device of pre-oxidation furnace temperature field uniformity;
Fig. 3 is A-A sectional view in Fig. 2;
Fig. 4 is the structural representation that device that the present invention improves pre-oxidation furnace temperature field uniformity carries out partial cutaway.
In figure, each Reference numeral is:
1, new wind supplements blower fan, and 2, switching device, 3, body of heater, 4, waste discharge blower fan, 5, waste pipe, 6, exhaust gas utilization pipe, 7, air inlet pipe, 8, compartment, 9, pre-oxidation region.
Detailed description of the invention:
Below in conjunction with each accompanying drawing, device the present invention being improved to pre-oxidation furnace temperature field uniformity is described in detail.
As Fig. 2, 3, shown in 4, a kind of device improving pre-oxidation furnace temperature field uniformity, this pre-oxidation furnace is lateral blowing formula oxidation furnace, vertical flow type oxidation furnace or central authorities are to both sides bleed type oxidation furnace, the present embodiment is that central authorities are to both sides bleed type oxidation furnace, pre-oxidation furnace comprises body of heater 3, the inner space of body of heater comprises the compartment 8 that two lay respectively at body of heater two ends, and the pre-oxidation region 9 to be connected with two compartments, sidewall of the furnace body and compartment corresponding position are provided with for the exhaust outlet of waste discharge and the air inlet for supplementing new wind, exhaust outlet is arranged on the upper end of sidewall of the furnace body, air inlet is arranged on the lower end of sidewall of the furnace body, each air inlet is communicated with pre-oxidation region 9 respectively by pipeline.The outside of body of heater is provided with the air inlet pipe 7 be connected with air inlet and the waste pipe 5 be connected with exhaust outlet, air inlet pipe 7 is provided with new wind and supplements blower fan 1, waste pipe 5 is provided with waste discharge blower fan 4, exhaust gas utilization pipe 6 is connected with between the sidewall of waste pipe and the sidewall of air inlet pipe, one end of this exhaust gas utilization pipe 6 is closed on new wind and is supplemented blower fan 1, and the other end closes on waste discharge blower fan 4.
Exhaust gas utilization pipe 6 is provided with and controls the unimpeded or closed switching device 2 of exhaust gas utilization pipe, and switching device is prior art, as motor-driven valve or hand-operated valve, adopts hand-operated valve in the present embodiment.
In the present embodiment, 13 layers of tow are had in body of heater, because can not seal completely, each layer tow gateway place all has air flowing, and the air in workshop can enter body of heater by the gateway of tow, waste gas in body of heater also can discharge body of heater by tow gateway, by recording the wind direction at 13 tow gateways place, namely recording the quantity of air intake and the quantity of air-out, the number of the amount of waste gas effusion body of heater can be contrasted, namely the quantity of air-out is larger, and the amount of waste gas effusion body of heater is more; The quantity of air-out is fewer, and the amount of waste gas effusion body of heater is fewer.
In order to verify actual effect of the present invention, invention has been contrast test, as shown in following table 1,2:
Table 1
Table 2
In table 1,2, after switching device is opened, the total blast volume of waste discharge blower fan significantly reduces, and in each tow gateway, the quantity also corresponding minimizing of air-out, the present invention can significantly reduce waste discharge amount, can significantly reduce waste gas and overflow from body of heater.
The foregoing is only the preferred embodiments of the present invention; not thereby scope of patent protection of the present invention is namely limited; the equivalent structure transformation that every utilization description of the present invention and accompanying drawing content are done; directly or indirectly be used in the technical field that other are relevant, be all in like manner included in protection scope of the present invention.
Claims (9)
1. one kind is improved the device of pre-oxidation furnace temperature field uniformity, described pre-oxidation furnace comprises body of heater, the inner space of body of heater comprises the compartment that two lay respectively at body of heater two ends, and the pre-oxidation region to be connected with two compartments, sidewall of the furnace body and compartment corresponding position are provided with for the exhaust outlet of waste discharge and the air inlet for supplementing new wind, each air inlet by pipeline respectively with pre-oxidation regional connectivity, it is characterized in that, the outside of described body of heater is provided with the air inlet pipe be connected with described air inlet and the waste pipe be connected with exhaust outlet, exhaust gas utilization pipe is connected with between the sidewall of described waste pipe and the sidewall of air inlet pipe.
2. the device improving pre-oxidation furnace temperature field uniformity as claimed in claim 1, is characterized in that, described exhaust gas utilization pipe is provided with and controls the unimpeded or closed switching device of exhaust gas utilization pipe.
3. the device improving pre-oxidation furnace temperature field uniformity as claimed in claim 2, it is characterized in that, described switching device is motor-driven valve or hand-operated valve.
4. the device improving pre-oxidation furnace temperature field uniformity as claimed in claim 1, it is characterized in that, described exhaust outlet is arranged on the upper end of sidewall of the furnace body.
5. the device improving pre-oxidation furnace temperature field uniformity as claimed in claim 4, it is characterized in that, described air inlet is arranged on the lower end of sidewall of the furnace body.
6. the device improving pre-oxidation furnace temperature field uniformity as claimed in claim 1, it is characterized in that, described air inlet pipe is provided with new wind and supplements blower fan.
7. the device improving pre-oxidation furnace temperature field uniformity as claimed in claim 6, it is characterized in that, described waste pipe is provided with waste discharge blower fan.
8. the device improving pre-oxidation furnace temperature field uniformity as claimed in claim 7, it is characterized in that, one end of described exhaust gas utilization pipe is closed on new wind and is supplemented blower fan, and the other end closes on waste discharge blower fan.
9. the device improving pre-oxidation furnace temperature field uniformity as claimed in claim 1, is characterized in that, described pre-oxidation furnace is that lateral blowing formula oxidation furnace, vertical flow type oxidation furnace or central authorities are to both sides bleed type oxidation furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410389172.2A CN104213254A (en) | 2014-08-08 | 2014-08-08 | Device to improve temperature field uniformity of pre-oxidation furnace |
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| CN201410389172.2A CN104213254A (en) | 2014-08-08 | 2014-08-08 | Device to improve temperature field uniformity of pre-oxidation furnace |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106480553A (en) * | 2016-10-31 | 2017-03-08 | 哈尔滨天顺化工科技开发有限公司 | A kind of pre-oxidation device for carbon fiber production |
| CN111778587A (en) * | 2020-07-30 | 2020-10-16 | 广州赛奥碳纤维技术股份有限公司 | Large-scale pre-oxidation furnace porch structure |
| CN114481371A (en) * | 2022-02-11 | 2022-05-13 | 新创碳谷控股有限公司 | Lateral blowing oxidation furnace device |
| CN114775111A (en) * | 2022-05-16 | 2022-07-22 | 清华大学 | Carbon fiber pre-oxidation system and high-temperature tail gas backflow method |
| CN115522283A (en) * | 2022-09-30 | 2022-12-27 | 江苏鹰游纺机有限公司 | Method for solving chimney effect at inlet and outlet of oxidation furnace |
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| CN201952535U (en) * | 2010-12-22 | 2011-08-31 | 中国科学院山西煤炭化学研究所 | Pre-oxidation furnace for producing carbon fibers |
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| JP2000136441A (en) * | 1998-11-02 | 2000-05-16 | Mitsubishi Rayon Co Ltd | Horizontal heat treatment oven and heat treatment |
| CN2534520Y (en) * | 2002-03-04 | 2003-02-05 | 汪永斌 | Waste gas recycling diesel oil hot-blast stove |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106480553A (en) * | 2016-10-31 | 2017-03-08 | 哈尔滨天顺化工科技开发有限公司 | A kind of pre-oxidation device for carbon fiber production |
| CN111778587A (en) * | 2020-07-30 | 2020-10-16 | 广州赛奥碳纤维技术股份有限公司 | Large-scale pre-oxidation furnace porch structure |
| CN114481371A (en) * | 2022-02-11 | 2022-05-13 | 新创碳谷控股有限公司 | Lateral blowing oxidation furnace device |
| CN114775111A (en) * | 2022-05-16 | 2022-07-22 | 清华大学 | Carbon fiber pre-oxidation system and high-temperature tail gas backflow method |
| CN115522283A (en) * | 2022-09-30 | 2022-12-27 | 江苏鹰游纺机有限公司 | Method for solving chimney effect at inlet and outlet of oxidation furnace |
| CN115522283B (en) * | 2022-09-30 | 2024-03-08 | 江苏鹰游纺机有限公司 | Method for solving inlet and outlet chimney effect of oxidation furnace |
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Application publication date: 20141217 |