CN101601499A - The method and apparatus of drying leaf-silk stage by stage - Google Patents
The method and apparatus of drying leaf-silk stage by stage Download PDFInfo
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- CN101601499A CN101601499A CNA2009100319868A CN200910031986A CN101601499A CN 101601499 A CN101601499 A CN 101601499A CN A2009100319868 A CNA2009100319868 A CN A2009100319868A CN 200910031986 A CN200910031986 A CN 200910031986A CN 101601499 A CN101601499 A CN 101601499A
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Abstract
The invention provides a kind of processing method and equipment of drying leaf-silk stage by stage, described method comprises two operation stages: the phase I is the fluidized drying stage, and the dry-heat air temperature is controlled at 110 ℃-160 ℃, makes about leaf silk fast dewatering to 15%; Second stage is a cylinder baking silk stage, and the barrel temperature is controlled at 60 ℃-100 ℃, is that about 15% leaf silk is dried the moisture about 12% with moisture; Described equipment comprises fluidized drying and two functional areas of cylinder baking silk, described fluidized drying functional areas involving vibrations fluid bed and the collection wind kuppe that is arranged at its top; Described cylinder baking silk functional areas comprise a baking silk cylinder, and the material inlet of baking silk cylinder is communicated with the groove that shakes.The present invention can effectively utilize the different drying property of constant rate drying period and falling rate drying period two middle periods in stage silk, under the prerequisite that does not improve leaf silk processing temperature, improves the filling value of leaf silk, reduces the fragrance loss of leaf silk in dry run simultaneously.
Description
Technical field:
The present invention relates in a kind of tobacco cutting production technology the leaf silk be carried out dry method, relate in particular to a kind of processing method of drying leaf-silk stage by stage.
The invention still further relates to a kind of equipment of realizing the above-mentioned processing method of drying leaf-silk stage by stage.
Background technology:
Leaf silk drying is the important procedure in the tobacco cutting production process.The operation target of leaf silk drying is the part moisture of removing in the leaf silk, improves the filling value of leaf silk, reduces the excitant and the assorted gas of leaf silk, improves the suction flavor of leaf silk.
Present leaves and tobacco drying method mainly contains two kinds of forms, tower tubular type pneumatic drying of cut tobacco and cartridge type baking silk.Tower tubular type pneumatic drying of cut tobacco is that the leaf silk is added in the drying tube continuously, in the process that the high-speed and high-temperature air-flow is carried, makes the moisture of leaf silk obtain evaporation, finally obtains the process of dried material.The dry tenacity of tower tubular type pneumatic drying of cut tobacco is big, and drying time is short, and treating capacity is big, thermal efficiency height, and the leaf silk finished product that obtains has bigger filling value.But the moisture of tower tubular type pneumatic drying of cut tobacco finished product and the fluctuation of temperature are bigger, and be harmonious relatively poor, temperature is higher in the whole process of producing high-grade leaf silk, the temperature of general air-flow is that processing temperature is too high, is difficult to keep this perfume (or spice) of leaf silk in the process between 160 ℃-260 ℃.Cartridge type baking silk is by heat exchange pattern, conducts the drying that realizes the leaf silk by the heat at a slow speed of cylinder barrel and leaf silk, and its PROCESS FOR TREATMENT temperature must be greater than 130 ℃, and the moisture that just can make the leaf silk is reduced to about 12% about by 20%-28%.The moisture of cartridge type baking silk finished product and the harmony of temperature are better, but the filling capacity of leaf silk is lower.A large amount of studies show that: for medium-to-high grade leaf silk, when the temperature of the leaf silk of leaf silk in process itself is higher than 100 ℃, dried leaf silk fragrance matter can obvious variation, and perfume quantity is reduction significantly.Existing drying means is difficult to solve the dehydrating amount of leaf silk and the contradiction that Ye Si fragrance is preserved.
For solving above technical problem, 200710148099.X the constant rate drying period at the leaf silk adopts different dry means with falling rate drying period, its first step adopts pneumatic conveying drying, to cut posterior lobe silk balancing water content to 20%, import in the pneumatic drier, pneumatic drier Zhong Yi district process gas temperature is controlled at 80～100 ℃, and two district's process gas temperature are controlled at 70～90 ℃, is that 20% leaf silk is dried to about 14～16% with moisture content; Second step was adopted roller drying, the leaf silk behind the pneumatic conveying drying is imported carry out the drying processing in the roller drier once more, and the barrel temperature is controlled at 70～80 ℃, made dry back moisture content of cut tobacco 12.0～13.0%.This technology combines traditional tubular type pneumatic conveying drying with drum-type drying, both improve the uniformity of handling posterior lobe silk moisture and the stability of temperature to reach, and reduces dry operating temperature again, reduces the purpose of the loss of leaf silk perfume quantity.But there is following shortcoming in this method:
1, the technological temperature in its pneumatic conveying drying step can not be realized the fast dewatering of high wet leaves silk at 80～100 ℃, so the filling value of its dry leaf silk is lower, it reduces drying process temperature is to be cost to reduce leaf silk filling capacity to keep leaf silk perfume quantity;
2, in its pneumatic conveying drying step, leaf silk and dry gas stream move in the same way, the even dispersion of leaf silk is not enough, the critical point of constant rate drying period and falling rate drying period can not fully reduce, the dry run of leaf silk enters falling rate drying period in advance, the temperature of leaf silk raises in heat transfer process, is unfavorable for the preservation of leaf silk fragrance.
Summary of the invention
Technical problem to be solved by this invention provides a kind of processing method of drying leaf-silk stage by stage, effectively utilize the different drying property of leaf silk of two drying stages of constant rate drying period and falling rate drying period, can be at the relative high temperature gas flow drying leaf-silk of constant rate drying period utilization, make full use of the cooling effect of high wet leaves silk moisture vaporization, under the prerequisite that does not improve leaf silk processing temperature, improve the filling value of leaf silk; When the leaf silk enters falling rate drying period, in time reduce the temperature of dry gas stream simultaneously, reduce leaf silk processing temperature, reduce the fragrance loss of leaf silk in dry run.
The processing method of drying leaf-silk stage by stage of the present invention comprises two operation stages, wherein, the phase I is to carry out constant rate of drying by fluidized drying, and the dry-heat air temperature is controlled at 110 ℃-160 ℃, making leaf silk fast dewatering to moisture is about 15%, leaf silk temperature≤100 ℃; Second stage is to carry out falling-rate periods of drying by cylinder baking silk, and the barrel temperature is controlled at 60 ℃-100 ℃, is that about 15% leaf silk is dried the moisture about 12% with moisture.
Fluidized drying of the present invention is meant that the leaf silk is the fluidised form motion, and in flow process, the leaf silk is dispersed in the hot blast by heated-air drying.
Through experimental results demonstrate, leaf silk drying was made up of two stages: constant rate drying period and falling rate drying period.And adopt two-stage stage drying pattern according to the different drying and dehydrating characteristics in two stages and the character of Ye Si, realize that the flexible dry drying process of " hot and humid, low temperature and low humidity " subregion control is a target of the present invention.
Phase I is the constant rate drying period of high wet leaves silk, and in this stage, the dry target of leaf silk is the moisture about fast dewatering to 15%, usually at 14%-15%.In this dry run, the surface of leaf silk is wetting by water institute all the time, the unbound water of leaf silk inside is easy to move to the surface, to replenish the moisture that the surface vaporization is lost, the rate of drying of constant rate of drying depends primarily on surperficial vaporization rate, relevant with temperature, humidity and the flow velocity of dry gas, and irrelevant with the character of leaf silk.Therefore, the leaf silk belongs to the surface vaporization control stage at constant rate drying period, and the temperature of leaf silk remains the wet-bulb temperature of air.Even if so be used for dry hot blast temperature between 110 ℃-160 ℃, the temperature of leaf silk remains at lower temperature levels (≤100 ℃).Therefore, the constant rate drying period of phase I can adopt fluidized drying, and this helps the fast dewatering of leaf silk, improves the filling value of leaf silk; Simultaneously, lower leaf silk temperature helps keeping the intrinsic fragrance and the qualitative characteristics of leaf silk in the dry run.
Second stage is the falling rate drying period of leaf silk.In this dry run, only need the moisture of dehydration 2%-4%, this dry target makes the low temperature drying of leaf silk become possibility, and the barrel temperature in this stage can be controlled between 60 ℃-90 ℃.In this stage, the moisture that moves to the surface from leaf silk inside has been not enough to replenish the moisture of surface vaporization, its saturated wetting state is no longer kept on leaf silk surface, at whole falling rate drying period, dry speed depends on the character of leaf silk, belong to leaf silk internal moisture and move the control stage, the temperature of leaf silk moves closer to the baking temperature in barrel in dry run, and the temperature of at this time controlling barrel will directly influence the aroma quality of finished product leaf silk.
The present invention passes through at the different phase in the leaf silk dry run, and take different drying processes, and in the fluidized drying operation of phase I, suitably improve the dry-heat air temperature, the uniformity of leaf silk drying is improved, keep the higher compactedness of dry posterior lobe silk, also effectively reduced the fragrance loss in the leaf silk dry run simultaneously.
For further improving drying efficiency, the present invention is in the fluidized drying stage, adopt the vibra fluidized bed drying mode, that is: be fed forward Ye Si and realize the fluidization in short distance of leaf silk by the groove vibration of shaking, hot blast is evenly upwards flowed by the groove bottom that shakes, and in being arranged at the collection wind kuppe on the groove top that shakes, finish heat exchange with the leaf silk, the moisture after the leaf silk thermal dehydration is discharged from collection wind kuppe top with hot blast.
Traditional tower tubular type pneumatic drier is when carrying out leaf silk drying, the direction of motion of leaf silk in hot-air flow is basic consistent with air-flow, therefore at the later stage of drying, when leaf silk movement velocity approaches air velocity, convective heat-transfer coefficient reduces greatly, drying efficiency reduces, and the time that the higher hot and humid gas of humidity and leaf wire connection are touched is longer, and the drying medium of high humility is unfavorable for the dehydration of leaf silk.The present invention adopts vibration thermopnore drying mode, make the leaf silk direction of motion keep vertical substantially with the hot-air flow direction all the time, make leaf silk materials and hot-air flow remain certain relative velocity in dry run, vibration also makes the boundary layer less turbulence increase, and convective heat-transfer coefficient increases greatly; Hot blast after humidity improves is simultaneously discharged fast, and the hot blast that is used for drying leaf-silk can remain on the level of a low humidity always, is more conducive to the leaf silk fast dewatering of high-moisture; In addition, in the vibrating transportation process, the leaf silk constantly overturns in drying, and the leaf silk is more even at the time ratio that dry section stops, and these all help the even drying of leaf silk, and whole pneumatic conveying drying process is strengthened, and also make the low temperature drying of leaf silk become possibility.
Second technical problem that the present invention will solve provides a kind of treatment facility of realizing the above-mentioned processing method of drying leaf-silk stage by stage.
The treatment facility of drying leaf-silk stage by stage of the present invention comprises two functional areas of fluidized drying and cylinder baking silk, described fluidized drying functional areas involving vibrations fluid bed and the collection wind kuppe that is arranged at its top; The bed body of described vibrated fluidized bed is the groove structure of shaking, and by fluidization and the conveying of groove vibration realizing leaf silk in short distance of shaking, the trench bottom that shakes is provided with hot-wind inlet, and collection wind kuppe top is provided with hot-blast outlet; Described cylinder baking silk functional areas comprise a baking silk cylinder, and the material inlet of baking silk cylinder is communicated with the groove that shakes.
The present invention is by improving the quick dewatering drying efficient of pipe tobacco, increase the filling capacity of pipe tobacco, utilize the characteristics of pipe tobacco material and the characteristics of drying and dehydrating simultaneously, by reducing the pipe tobacco temperature in the whole dry run, keep the content of the oxious component such as tar, smoking nicotine of the intrinsic fragrance of pipe tobacco and style and features and reduction cigarette.By implementing the present invention, can obtain following technique effect:
(1) effectively reduces the pipe tobacco temperature of drying process process, keep the intrinsic fragrance and the style and features of pipe tobacco, reduce the content of the oxious components such as tar, smoking nicotine of cigarette simultaneously;
(2) effectively realize the fast dewatering of high-moisture pipe tobacco, increase the filling capacity of pipe tobacco.
Description of drawings
Fig. 1 is a leaf silk drying stage curve;
Fig. 2 forms front view for realizing equipment of the present invention;
Fig. 3 is the vertical view of Fig. 2.
The specific embodiment
As shown in Figure 1, leaf silk drying was made up of two stages: constant rate drying period AB and falling rate drying period BC.The critical point B of constant rate drying period AB and falling rate drying period BC is not only relevant with the character of leaf silk, and the marked change with the difference of drying condition.The leaf silk is dispersed in the hot blast when dry, and with respect to the similar motion in the same way of piling up dry and tower tubular type pneumatic conveying drying middle period silk and air-flow of roller drying, the leaf silk moisture of this critical point correspondence can significantly be reduced to about 15%.So the drying of phase I adopts fluidized drying, help reducing the numerical value of the critical moisture content of leaf silk, reach the purpose of fast dewatering under the prerequisite that the leaf silk keeps low temperature.
The present invention has made full use of the different dry characteristics of constant rate of drying of leaf silk and falling rate drying period, takes corresponding dry means, implements leaf silk drying.The combination of two kinds of drying modes has realized the dry linking successively of the dry and meticulous formula of the extensive style of leaf silk, guaranteed that the leaf silk keeps lower temperature in the process of twice dehydration, under the prerequisite of guaranteeing the silk leaf expansion effect, keep intrinsic fragrance of pipe tobacco and style and features to greatest extent.
The preferred leaf silk of the present invention dry treatment process specifically may further comprise the steps:
1, with the leaf silk water balance after the chopping to about the 20%-24%, by flow controlling unit, the leaf silk is sent into drying equipment;
2, first section at drying equipment adopts the vibra fluidized bed drying mode to realize the fluidization in short distance of leaf silk fast; Evenly upwards sending into temperature by the groove bottom that shakes is 110 ℃-160 ℃ hot blast, upwards the hot blast that flows in collection wind kuppe and the leaf silk finish heat exchange; Moisture after the leaf silk thermal dehydration is discharged from collection wind kuppe top with hot blast; Moisture through the leaf silk after the fluidized drying is about 15%, and temperature is lower than 100 ℃, and the filling value of leaf silk can reach about 4.1-4.5.
3, the leaf silk after fluidized drying directly enters second section of drying equipment, i.e. roller drying section, and cylinder barrel temperature is controlled between 60 ℃-90 ℃, and dried leaf silk moisture is about 12%, and the temperature of leaf silk is about 40 ℃-50 ℃.The roller drying section directly is connected with the fluidized drying section, can avoid the temperature loss of the leaf silk in the phase transition process.
As shown in Figure 2, section drying cut tobacco device described in the utility model is a complete integral body, comprises two functional areas, and the left side is fluidized drying functional areas 1, and the right side is that cylinder baking silk 2, two functional areas, functions/drying district directly are communicated with.
As Fig. 2, shown in Figure 3, the form of vibra fluidized bed drying is adopted in described fluidized drying functional areas, and it comprises the groove 11 that shakes, and groove 11 tops that shake are provided with collection wind kuppe 12; Groove 11 bottoms that shake are evenly laid hot blast and are sent into mouthfuls 13; Hot blast outlet 14 is established at collection wind kuppe 12 tops, and the humidity of fluidized drying functional areas 1 outlet hot blast is bigger, and hot blast does not recycle.The troughstand face length of shaking degree is about 2 meters, and the fluidization of leaf silk and conveying are mainly finished by the groove that shakes, and realizes fluidization to guarantee the leaf silk in short distance.In the groove 11 vibrating transportation processes of shaking, the leaf silk constantly overturns in drying, and the leaf silk is more even at the time ratio that dry section stops, and these all help the even drying of leaf silk, and whole dry run is strengthened.In these functional areas, the drying medium of leaf silk is a hot blast, and hot blast is evenly upwards flowed by groove 11 bottoms that shake, and finishes heat exchanging process with the leaf silk in collection wind kuppe 12, and the moisture after the leaf silk thermal dehydration is discharged from collection wind kuppe 12 tops with hot blast.
As Fig. 2, shown in Figure 3, described cylinder baking silk functions/drying district 2 comprises baking silk cylinder 21, and cylinder 21 can adopt existing baking silk roller frame; The leaf silk inlet of cylinder 21 is communicated with the groove 11 that shakes.Leaf silk after fluidized drying directly enters in the baking silk cylinder 21 via the groove 11 that shakes.Because the basis of the effective fast dewatering of phase I leaf silk has been arranged, the dehydration task of the falling-rate periods of drying process of second stage reduces, and only needs the moisture of dehydration 2%-4%, and this dry target makes the low temperature drying of leaf silk become possibility.In this stage, the barrel temperature of baking silk cylinder 21 can be controlled between 60 ℃-90 ℃, finishes the leaf silk drying of second stage.
Claims (4)
1, a kind of processing method of drying leaf-silk stage by stage, comprise two operation stages of constant rate of drying and falling-rate periods of drying, it is characterized in that: the phase I is to carry out constant rate of drying by fluidized drying, the dry-heat air temperature is controlled at 110 ℃-160 ℃, make leaf silk fast dewatering, about leaf silk moisture to 15%, leaf silk temperature≤100 ℃; Second stage is to carry out falling-rate periods of drying by cylinder baking silk, and the barrel temperature is controlled at 60 ℃-100 ℃, is that about 15% leaf silk is dried the moisture about 12% with moisture.
2, the processing method of drying leaf-silk stage by stage according to claim 1, it is characterized in that: in the described fluidized drying stage, adopt the vibra fluidized bed drying mode to carry out leaf silk drying, that is: be fed forward Ye Si and realize the fluidization in short distance of leaf silk by the groove vibration of shaking, hot blast is evenly upwards flowed by the groove bottom that shakes, and in being arranged at the collection wind kuppe on the groove top that shakes, finish heat exchange with the leaf silk, the moisture after the leaf silk thermal dehydration is discharged from collection wind kuppe top with hot blast.
3, the processing method of drying leaf-silk stage by stage according to claim 1 and 2 is characterized in that: at described cylinder baking silk drying stage, the barrel temperature is controlled at 60 ℃-90 ℃.
4, a kind of realization is characterized in that as the equipment of claim 1 or the 2 described processing methods of drying leaf-silk stage by stage: comprise two functional areas of fluidized drying and cylinder baking silk; Described fluidized drying functional areas involving vibrations fluid bed and the collection wind kuppe that is arranged at its top; The bed body of described vibrated fluidized bed is the groove structure of shaking, and by fluidization and the conveying of groove vibration realizing leaf silk in short distance of shaking, the trench bottom that shakes is provided with hot-wind inlet, and collection wind kuppe top is provided with hot-blast outlet; Described cylinder baking silk functional areas comprise a baking silk cylinder, and the material inlet of baking silk cylinder is communicated with the groove that shakes.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101926500A (en) * | 2010-08-31 | 2010-12-29 | 江苏智思机械集团有限公司 | Section drying cut tobacco equipment and method |
| CN102845826A (en) * | 2012-10-17 | 2013-01-02 | 云南烟草科学研究院 | Method for drying tobacco shreds |
| CN104013089A (en) * | 2014-05-16 | 2014-09-03 | 中国烟草总公司郑州烟草研究院 | Hot air variable temperature tobacco shred drying device and warm-keeping drying test method thereof |
| CN105361229A (en) * | 2015-12-14 | 2016-03-02 | 贵州中烟工业有限责任公司 | Method for reducing cigarette tar release amount through cylinder wall temperature |
| CN105361230A (en) * | 2015-12-14 | 2016-03-02 | 贵州中烟工业有限责任公司 | Method for reducing tar release amount of cigarettes by adjusting opening degree of moisture exhaust air door |
| CN105361234A (en) * | 2015-12-14 | 2016-03-02 | 贵州中烟工业有限责任公司 | Cut-tobacco dryer with adjustable hot-air directions and method for adjusting same |
| CN105410982A (en) * | 2015-12-14 | 2016-03-23 | 贵州中烟工业有限责任公司 | Method for reducing cigarette tar release amount through opening degree of hot air damper |
| CN105495670A (en) * | 2015-12-14 | 2016-04-20 | 贵州中烟工业有限责任公司 | Method for reducing tar release amount of cigarettes through hot-blast temperature |
| CN105495671A (en) * | 2015-12-14 | 2016-04-20 | 贵州中烟工业有限责任公司 | Method for reducing tar release amount of cigarettes through drum rotation speed |
| CN105533788A (en) * | 2015-12-14 | 2016-05-04 | 贵州中烟工业有限责任公司 | Method for decreasing the amount of tar release of cigarette |
| CN105851871A (en) * | 2016-04-05 | 2016-08-17 | 东莞市食滋源食品有限公司 | Manufacturing technology of pastry |
| CN106490668A (en) * | 2016-12-14 | 2017-03-15 | 湖北中烟工业有限责任公司 | A kind of two benches cigarette leaves and tobacco drying unit and baking silk technique |
| CN112754054A (en) * | 2021-01-20 | 2021-05-07 | 浙江中烟工业有限责任公司 | Novel on-line drying method for heating cigarette tobacco shreds |
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2009
- 2009-06-26 CN CNA2009100319868A patent/CN101601499A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101926500A (en) * | 2010-08-31 | 2010-12-29 | 江苏智思机械集团有限公司 | Section drying cut tobacco equipment and method |
| CN102845826A (en) * | 2012-10-17 | 2013-01-02 | 云南烟草科学研究院 | Method for drying tobacco shreds |
| CN104013089B (en) * | 2014-05-16 | 2016-05-04 | 中国烟草总公司郑州烟草研究院 | A kind of pipe tobacco hot blast alternating temperature drying device and alternating temperature drying test method thereof |
| CN104013089A (en) * | 2014-05-16 | 2014-09-03 | 中国烟草总公司郑州烟草研究院 | Hot air variable temperature tobacco shred drying device and warm-keeping drying test method thereof |
| CN105361229A (en) * | 2015-12-14 | 2016-03-02 | 贵州中烟工业有限责任公司 | Method for reducing cigarette tar release amount through cylinder wall temperature |
| CN105361234A (en) * | 2015-12-14 | 2016-03-02 | 贵州中烟工业有限责任公司 | Cut-tobacco dryer with adjustable hot-air directions and method for adjusting same |
| CN105410982A (en) * | 2015-12-14 | 2016-03-23 | 贵州中烟工业有限责任公司 | Method for reducing cigarette tar release amount through opening degree of hot air damper |
| CN105495670A (en) * | 2015-12-14 | 2016-04-20 | 贵州中烟工业有限责任公司 | Method for reducing tar release amount of cigarettes through hot-blast temperature |
| CN105495671A (en) * | 2015-12-14 | 2016-04-20 | 贵州中烟工业有限责任公司 | Method for reducing tar release amount of cigarettes through drum rotation speed |
| CN105361230A (en) * | 2015-12-14 | 2016-03-02 | 贵州中烟工业有限责任公司 | Method for reducing tar release amount of cigarettes by adjusting opening degree of moisture exhaust air door |
| CN105533788A (en) * | 2015-12-14 | 2016-05-04 | 贵州中烟工业有限责任公司 | Method for decreasing the amount of tar release of cigarette |
| CN105851871A (en) * | 2016-04-05 | 2016-08-17 | 东莞市食滋源食品有限公司 | Manufacturing technology of pastry |
| CN106490668A (en) * | 2016-12-14 | 2017-03-15 | 湖北中烟工业有限责任公司 | A kind of two benches cigarette leaves and tobacco drying unit and baking silk technique |
| CN106490668B (en) * | 2016-12-14 | 2018-07-10 | 湖北中烟工业有限责任公司 | A kind of two benches cigarette leaves and tobacco drying unit and baking silk technique |
| CN112754054A (en) * | 2021-01-20 | 2021-05-07 | 浙江中烟工业有限责任公司 | Novel on-line drying method for heating cigarette tobacco shreds |
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Application publication date: 20091216 |