CN205209195U - Take phase change energy storage heat exchanger tube bundles's heated air circulation drying system - Google Patents
Take phase change energy storage heat exchanger tube bundles's heated air circulation drying system Download PDFInfo
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- CN205209195U CN205209195U CN201520938906.8U CN201520938906U CN205209195U CN 205209195 U CN205209195 U CN 205209195U CN 201520938906 U CN201520938906 U CN 201520938906U CN 205209195 U CN205209195 U CN 205209195U
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- heat
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- accumulation energy
- heat transfer
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The utility model relates to a take heat recovery's energy -saving drying system. A take phase change energy storage heat exchanger tube bundles's heated air circulation drying system, including the hot -blast furnace, drying cabinet and connect the two pipeline, introduces at the phase change energy storage heat transfer district that arranges in drying cabinet one side after the air heat transfer in the stove in flue gas and the circulating line, three subregion under during the heat transfer district divide into with baffle no. 1 and baffle no. 2, the flue gas is introduced the heat transfer inferior segment, phase change energy storage heat exchanger tube bundles by in the running through of misalignment down the multiseriate heat exchange tube group in heat transfer district become, it is 50~80 DEG C phase change material to pack phase transition temperature in the heat exchange tube, behind the air and the interior flue gas heat transfer of stove in the circulation intake stack, the center district that gets into phase transition heat transfer district from the left side is further endothermic, then get into the drying chamber from the right side, distinguish with the entering of the circulation air -out behind material heat and mass transfer phase transition heat transfer in the drying chamber and distinguish the heat transfer, back hydrofuge gets into the stove interior conduit through circulating fan after mending wind, form complete circulation. The simple structure of this system can realize dry complete period heat recovery and utilize simultaneously.
Description
Technical field
The utility model relates to a kind of hot air drying system, particularly a kind of energy-efficient drying system with heat recovery.
Background technology
Different dry objects has different drying means, and what wherein the drying of industrial and agricultural products was the most frequently used is heated-air drying mode, has simple, the advantage of wide adaptability.But the thermal efficiency of hot blast cross-flow drying system is lower, and evenly heat efficiency only has about 55%, and heat recovery is few, the EGT that dryer section is discharged is higher, at 40 DEG C ~ 60 DEG C.The dry major part of the agricultural product of China adopts coal as thermal source, insufficient with the heat exchange of dry air, still has 110 DEG C ~ 130 DEG C during fume emission, even have up to 150 DEG C, this partial heat has also discharged in vain.In addition, dried temperature of charge is often higher, and also need to pass into dry air and cool, also some heat can utilize.To this, researcher recycles in heat recovery and damp-heat air dehumidifying and does a lot.Find that the EGT of the dryer section discharge of drying system is at 40 DEG C ~ 60 DEG C, relative humidity average out to 20% ~ 50%, the EGT that cooling section is discharged is at 10 DEG C ~ 40 DEG C, and relative humidity on average 10% ~ 40%, but has often only reclaimed the hot waste gas of dryer section in actual utilization.In heat recovery equipment, take tubular heat exchanger, the mode of heat pump carried out recuperation of heat, although the simple small investment of tubular heat exchanger, but heat exchange efficiency is not high, and energy-saving effect is undesirable; Although heat pump fractional energy savings in recuperation of heat is high, invests relatively high, but also will consume a part of high-quality electric energy, usually the good energy-conserving effect when dry initial humidity is higher, when the middle and later periods, humidity was lower, effect is bad, even unsuitable start.In dehumidifying recycles, heat dehumidifier often more expensive, effect is not remarkable; Cool-down dehumidification does not have too large meaning again.For the problem such as the temperature and humidity difference of several difference heat to be recycled, recovery time be inconsistent, not yet there is the solution of an economical rationality.
Summary of the invention
The problem such as the utility model is lower for heat recovery efficiency, recovery time and temperature are not mated, arrange that in hothouse side embedded phase change heat-storing device carries out heat recovery, the heat reclaimed comprises flue gas heat, dry waste gas and cooling section waste gas three class, and the temperature counterpart achieving several waste heat is recycled.
The technical solution of the utility model is as follows: a kind of heat-wind circulate drying system with phase-change accumulation energy heat-exchanging tube bundle, comprise hot-blast stove, drying box and the air channel both connection, hot-blast stove can coal-fired or living beings, air in the flue gas and the circulation intake stack that produce restrain by flue gas heat exchange and is carried out heat exchange, flue-gas temperature reduction after heat exchange, EAT rising, but because heat exchange efficiency is not high, the temperature of flue gas is still higher, still has more than 80 DEG C, and direct discharge can cause thermal loss.Therefore it is introduced the phase-change accumulation energy heat transfer zone being arranged in drying box side through smoke discharging pipe by smoke exhaust fan, heat transfer zone dividing plate one and dividing plate two are divided into upper, middle and lower three sub regions, flue gas enters from smoke inlet above, after carrying out heat exchange with phase-change accumulation energy heat-exchanging tube bundle, discharge from outlet, phase-change heat-exchange is restrained the multiple row heat exchanger tube running through upper, middle and lower heat transfer zone arranged by mistake and is formed, heat exchanger tube slightly tilts, the angle of about 10 ° is presented with vertical, filling phase transition temperature in pipe is that the phase-change material of 60 ~ 80 DEG C is (as paraffin, add the barium hydroxide etc. of 6% barium chloride), the shape of cross section of heat exchanger tube can be band inner fin, also can be light pipe.Because flue-gas temperature is higher, heat transfer makes it to undergo phase transition to phase-change material, after the phase-change material fusing of heat exchanger tube lower region, inside can form free convection slowly, because heat exchanger tube has certain gradient, more convenient thawing liquid up flows, make solid liquid interface gradually on move, melt region constantly expand.And after the air circulated in intake stack and flue gas heat exchange, temperature promotes to some extent, then enters the middle district of phase inversion hot-zone, because its temperature is lower than the phase transition temperature of phase-change material, the liquid melted can be made to solidify releasing heat, and circulation air intake enters hothouse after absorbing heat further.After there is complicated heat and mass in hothouse, form the circulation air-out of different temperatures humidity in different phase, the early stage of drying air intake heat is absorbed in a large number, and the state of air-out is low temperature and high relative humidity, middle and later periods air-out state is higher temperatures low humidity, still has heat to utilize.Circulation air-out enters district on phase inversion hot-zone, or transferring heat to phase-change material is in sensible heat endothermic phase by it, for the preparation that heats up early stage is carried out in phase transformation; The higher phase-change material that allows of temperature occurs to melt store heat, and the liquid state phase change material of generation runs downwards under gravity, makes district in phase-change heat-exchange be in melting state.Simultaneously arrange and mend wind humidity-discharging device recycling wind pipeline, impose a condition and carry out mending new wind and hydrofuge, then entered in stove by circulating fan and heat, form a complete circulation.Visible, in the process, the exhaust fumes that temperature is the highest and the minimum circulation air-out of temperature all with phase inversion heat pipe heat exchanging, energy is stored in wherein as far as possible, and the air intake that circulates needs to take away the heat in phase-change accumulation energy pipe, make EAT higher, utilize dry run to carry out more fast.Phase after the drying, even can realize not adding fuel, air intake without the need to flue gas heat exchange, but directly in phase-change accumulation energy pipe, obtain heat, until phase-change material all solidifies.At the end of drying, need cooling heat dissipation, now close stove combustion, often opened by benefit fresh wind port, air intake is normal temperature, takes away the heat of material, and leaving air temp is higher also can be kept at district on phase-change heat-exchange by this portion of energy, is next round dry materials deposit heat.
Heat recovering process needs good control, to realize Energy harvesting optimization, can at smoke discharging pipe, the intake stack that circulates, recycle set temperature sensor on wind pipeline, when detecting that the temperature difference of circulation air intake and circulation air-out is less, the exhaust air rate that fuel supplies or turns down smoke exhaust fan can be reduced, when the time detects the second half section of falling rate of drying, stove combustion can be stopped, supplying heat by phase-change thermal storage completely.
This system can realize dry complete period heat recovery and heat release simultaneously utilizes, and the phase-change accumulation energy heat-exchanger rig of interpolation can simultaneously at different section energy storage and exoergic, and structure is simple, drives without the need to exterior power.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, utility model is described further.
Fig. 1 is the front view of the heat-wind circulate drying system of band phase-change accumulation energy heat-exchanging tube bundle;
Fig. 2 is the top view of the heat-wind circulate drying system of band phase-change accumulation energy heat-exchanging tube bundle;
Fig. 3 is front view and the A-A sectional view of phase-change accumulation energy heat exchanger tube.
In figure: 1-shoot door 2-fire door 3-hot-blast stove 4-circulating fan 5-smoke exhaust fan 6-smoke discharging pipe
7-circulation intake stack 8-recycles wind pipeline 9-phase-change accumulation energy heat-exchanging tube bundle 10-dividing plate one
11-drying box 12-dividing plate two 13-heat-exchanging tube bundle bracing ring 14-flue gas heat exchange is restrained
15-exhanst gas outlet 16-smoke inlet 17-mends fresh wind port 18-and mends wind humidity-discharging device
19-moisture exhausting port 20-phase-change accumulation energy heat exchanger tube fin 21-phase-change accumulation energy heat exchanger tube upper cover.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.
Fig. 1 ~ 2 are the major-minor view of the heat-wind circulate drying system of band phase-change accumulation energy heat-exchanging tube bundle, and Fig. 3 is the structure chart of phase-change accumulation energy heat exchanger tube.A kind of heat-wind circulate drying system with phase-change accumulation energy heat-exchanging tube bundle, comprise hot-blast stove 3, drying box 11 and the air channel both connection, hot-blast stove can coal-fired or living beings, and at below blow-on door 2 below and shoot door 1, the air in the flue gas of generation and circulation intake stack is restrained 14 by flue gas heat exchange and carried out heat exchange, after heat exchange, flue-gas temperature reduces, EAT raise, but due to heat exchange efficiency not high, the temperature of flue gas is still higher, still have more than 80 DEG C, direct discharge can cause thermal loss.Therefore it is introduced the phase-change accumulation energy heat transfer zone being arranged in drying box side through smoke discharging pipe 6 by smoke exhaust fan 5, heat transfer zone dividing plate 1 and dividing plate 2 12 are divided into upper, middle and lower three sub regions, on dividing plate one and dividing plate two, perforate allows smoke discharging pipe 6 and phase-change accumulation energy heat-exchanging tube bundle 9 pass, and dividing plate 2 12 is welded with the diameter heat-exchanging tube bundle bracing ring 13 that match more bigger than heat exchanger tube and tube bank is fixed; Or directly heat-exchanging tube bundle 9 and dividing plate 1 or dividing plate 2 12 are fixed stifled real in perforation place spot welding.Flue gas enters from the smoke inlet 16 be positioned at above, after carrying out heat exchange, discharges from the outlet 15 be positioned at below with phase-change accumulation energy heat-exchanging tube bundle 9.Phase-change heat-exchange is restrained the multiple row heat exchanger tube running through upper, middle and lower heat transfer zone arranged by mistake and is formed, and heat exchanger tube slightly tilts, and presents the angle of about 10 ° with vertical.Filling phase transition temperature in phase inversion heat pipe is that the phase-change material of 50 ~ 80 DEG C is (as paraffin, add the barium hydroxide etc. of 6% barium chloride), determine according to the temperature of three strands of air-flows in dry run, the discarded flue-gas temperature of originally directly draining is made to exceed phase transition temperature about 20 DEG C ~ 50 DEG C, to improve heat accumulation power efficiency, when dry run most, EAT and leaving air temp are lower than phase transition temperature, later stage, leaving air temp was higher than phase transition temperature, the filling rate of phase-change material is about 0.7 ~ 0.9, determine according to the coefficient of expansion of phase-change material, fill rear with threaded heat exchanger tube upper cover 21 screwing hermetic connected.The shape of cross section of heat exchanger tube can be with inner fin 20, also can be light pipe, arranges that inner fin can augmentation of heat transfer, effectively can improve the low problem of phase-change material thermal conductivity factor.
Because flue-gas temperature is higher, heat transfer makes it to undergo phase transition to phase-change material, after the phase-change material fusing of heat exchanger tube lower region, inside can form free convection slowly, the thawing cognition that temperature is higher moves up, and because heat exchanger tube has certain gradient, more convenient thawing liquid up flows, make solid liquid interface gradually on move, melt region constantly expand.And after the air circulated in intake stack 8 and flue gas heat exchange, temperature promotes to some extent, then enters the middle district of phase inversion hot-zone, because its temperature is lower than the phase transition temperature of phase-change material, the liquid melted can be made to solidify releasing heat, and circulation air intake enters hothouse after absorbing heat further.After there is complicated heat and mass in hothouse, form the circulation air-out of different temperatures humidity in different phase, the early stage of drying air intake heat is absorbed in a large number, and the state of air-out is low temperature and high relative humidity, middle and later periods air-out state is higher temperatures low humidity, still has heat to utilize.Circulation air-out enters district on phase inversion hot-zone, or transferring heat to phase-change material is in sensible heat endothermic phase by it, for the preparation that heats up early stage is carried out in phase transformation; The higher phase-change material that allows of temperature occurs to melt store heat, and the liquid state phase change material of generation runs downwards under gravity, makes district in phase-change heat-exchange be in melting state.Simultaneously arrange and mend wind humidity-discharging device 18, mend fresh wind port 17 and moisture exhausting port 19 recycling wind pipeline 7, impose a condition and carry out mending new wind and hydrofuge, then entered in stove by circulating fan 4 and heat, form a complete circulation.
Visible, in the process, the exhaust fumes that temperature is the highest and the minimum circulation air-out of temperature all with phase inversion heat pipe heat exchanging, energy is stored in wherein as far as possible, and the air intake that circulates needs to take away the heat in phase-change accumulation energy pipe, make EAT higher, utilize dry run to carry out more fast.Phase after the drying, even can realize not adding fuel, air intake without the need to flue gas heat exchange, but directly in phase-change accumulation energy pipe, obtain heat, until phase-change material all solidifies.At the end of drying, need cooling heat dissipation, now close stove combustion, often opened by benefit fresh wind port, air intake is normal temperature, takes away the heat of material, and leaving air temp is higher also can be kept at district on phase-change heat-exchange by this portion of energy, is next round dry materials deposit heat.
The control system of heat recovering process comprises signal measurement, collection and change and send, at smoke discharging pipe, the intake stack that circulates, recycle wind pipeline and enter phase-change accumulation energy heat transfer zone place set temperature sensor and humidity sensor, when detecting that the temperature difference of circulation air intake and circulation air-out is within 10 DEG C, the exhaust air rate that fuel supplies or turns down smoke exhaust fan can be reduced, when the time detects the second half section of falling rate of drying, stove combustion can be stopped, supplying heat by phase-change thermal storage completely.
Claims (7)
1. the heat-wind circulate drying system with phase-change accumulation energy heat-exchanging tube bundle, comprise hot-blast stove (3), drying box (11) and the smoke discharging pipe (6) both connection, circulation intake stack (7) and recycle wind pipeline (8), air in the flue gas that stove combustion produces and circulation intake stack (7) is restrained (14) by flue gas heat exchange and is carried out heat exchange, it is characterized in that: introduce by smoke exhaust fan (5) the phase-change accumulation energy heat transfer zone being arranged in drying box side with the flue gas after circulation intake stack (7) heat exchange through smoke discharging pipe (6), heat transfer zone dividing plate one (10) and dividing plate two (12) are divided into upper, middle and lower three sub regions, on dividing plate one and dividing plate two, perforate allows smoke discharging pipe (6) and phase-change accumulation energy heat-exchanging tube bundle (9) pass, smoke inlet (16) is positioned at before dividing plate two, outlet (15) is positioned on the rear facade of lower heat transfer zone, the multiple row heat exchanger tube running through upper, middle and lower heat transfer zone that phase-change accumulation energy heat-exchanging tube bundle (9) is arranged by mistake forms, heat exchanger tube and vertical present the angle of about 10 °, the phase-change material that phase transition temperature is 50 ~ 80 DEG C is filled in heat exchanger tube, after air in circulation intake stack (8) and flue gas heat exchange, enter district phase inversion hot-zone to absorb heat further from left side, then drying box (11) is entered from right side, enter from the right side in district phase inversion hot-zone with the circulation air-out after material heat and mass in hothouse, mend wind humidity-discharging device (18) with entering after phase-change accumulation energy heat-exchanging tube bundle (9) heat exchange to be provided with, mend the wind pipe (7) of fresh wind port (17) and moisture exhausting port (19), the heating of stove interior conduit is entered again by circulating fan (4), form a complete circulation.
2. the heat-wind circulate drying system of band phase-change accumulation energy heat-exchanging tube bundle according to claim 1, is characterized in that: the phase transition temperature of the phase-changing energy storage material of filling in phase-change accumulation energy heat-exchanging tube bundle (9) is lower than the flue-gas temperature after heat exchange in stove 20 DEG C ~ 50 DEG C.
3. the heat-wind circulate drying system of band phase-change accumulation energy heat-exchanging tube bundle according to claim 1, it is characterized in that: phase-change accumulation energy heat transfer zone base plate is welded with the diameter heat-exchanging tube bundle bracing ring (13) that match more bigger than heat exchanger tube, phase-change accumulation energy heat-exchanging tube bundle (9) is determined through dividing plate one (10) and dividing plate two (12) time point solid welding.
4. the heat-wind circulate drying system of band phase-change accumulation energy heat-exchanging tube bundle according to claim 1, it is characterized in that: the filling rate of phase-change material is still to have the inter-air space of 10% ~ 20% to be as the criterion, with threaded heat exchanger tube upper cover (21) screwing hermetic connected after having filled phase-change material after phase-change material thawing.
5. the heat-wind circulate drying system of band phase-change accumulation energy heat-exchanging tube bundle according to claim 1, is characterized in that: hot-blast stove can fire coal, living beings, oil, natural gas.
6. the heat-wind circulate drying system of band phase-change accumulation energy heat-exchanging tube bundle according to claim 1, is characterized in that: with the inner fin (20) of augmentation of heat transfer in every root heat exchanger tube of phase-change accumulation energy heat-exchanging tube bundle (9).
7. the heat-wind circulate drying system of band phase-change accumulation energy heat-exchanging tube bundle according to claim 1, it is characterized in that: also comprise control system, sent by signal measurement, collection and change and form with executing agency, at smoke discharging pipe, the intake stack that circulates, recycle wind pipeline and enter phase-change accumulation energy heat transfer zone place set temperature sensor and humidity sensor, control algolithm is when detecting that the temperature difference of circulation air intake and circulation air-out is within 10 DEG C, can reduce the exhaust air rate that fuel supplies or turns down smoke exhaust fan; When the time detects the second half section of falling rate of drying, stove combustion can be stopped, supplying heat by phase-change thermal storage completely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520938906.8U CN205209195U (en) | 2015-11-23 | 2015-11-23 | Take phase change energy storage heat exchanger tube bundles's heated air circulation drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520938906.8U CN205209195U (en) | 2015-11-23 | 2015-11-23 | Take phase change energy storage heat exchanger tube bundles's heated air circulation drying system |
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| CN205209195U true CN205209195U (en) | 2016-05-04 |
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| CN201520938906.8U Expired - Fee Related CN205209195U (en) | 2015-11-23 | 2015-11-23 | Take phase change energy storage heat exchanger tube bundles's heated air circulation drying system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766844A (en) * | 2015-11-23 | 2017-05-31 | 云南师范大学 | Hot air circulation drying system with phase-change accumulation energy heat-exchanging tube bundle |
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2015
- 2015-11-23 CN CN201520938906.8U patent/CN205209195U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766844A (en) * | 2015-11-23 | 2017-05-31 | 云南师范大学 | Hot air circulation drying system with phase-change accumulation energy heat-exchanging tube bundle |
| CN106766844B (en) * | 2015-11-23 | 2018-12-25 | 云南师范大学 | Hot air circulation drying system with phase-change accumulation energy heat-exchanging tube bundle |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160504 Termination date: 20161123 |
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| CF01 | Termination of patent right due to non-payment of annual fee |