CN104101200A - Deep-bed grain drying system and method employing coupling of variable-temperature alternating airflow and vibration - Google Patents
Deep-bed grain drying system and method employing coupling of variable-temperature alternating airflow and vibration Download PDFInfo
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
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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
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
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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
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Abstract
The invention provides a deep-bed grain drying system and method employing coupling of variable-temperature alternating airflow and vibration. According to the system and the method, heat entering a drying room and temperature, speed and direction of air entering the drying room are controlled according to the characteristics of a heat transfer medium in grains, so that heat input is matched with the grain drying kinetic process. The method includes: charging forward high-temperature dry air into the drying room until a temperature that a middle temperature measurer measures reaches a preset drying temperature; deceasing the temperature of the forward high-temperature dry air, and charging intermediate-temperature temper air until a temperature that an opposite-end temperature measurer measures reaches the preset drying temperature; changing the air direction, charging reverse high-temperature dry air into the drying room until a temperature that a middle temperature measurer measures reaches the preset drying temperature; decreasing the air temperature, and charging intermediate-temperature temper air until a temperature that the opposite-end temperature measurer measures reaches the preset drying temperature; performing the cycle until moisture content of the grains in the drying room reaches preset moisture content.
Description
Technical field
The present invention relates to the grains such as cereal and deposit technical field, refer to especially a kind of thick-layer grain drying system and method for be coupled alternating temperature alternation air-flow and vibration.
Background technology
For this populous nation of China, the agricultural byproducts such as grain are extremely important strategic materials always, are related to national economy.Although Shi Chan grain big country of China, because the dry means of cereal fall behind, it is estimated and have every year up to the cereal of grain yield 5% owing to having little time to dry or airing does not reach safe moisture and causes and go mouldy, germinate.According to official statistics numeral, 60,194 ten thousand tons of China's total output of grains in 2013, loss is up to 3009.7 ten thousand tons.And China is dry falls l.0kg moisture needs energy consumption 5000-8000kJ, and this index of developed country is only 3344-4598kJ, and China's cereal energy consumption for drying is about the twice of developed country.
The dry essence of cereal is the transmittance process of the complicated caloic coupling of granular system under drying medium effect, and in dry run, makes the water capacity of cereal be reduced to 14% left and right, is beneficial to safe storage.At present, the cereal dry technology of practical application mainly contains the combination of stacking bed, fluid bed, spouted bed drying and these technology.
Fluidized bed drying method has the advantage that rate of drying is high, and spouted bed drying method has the advantage that energy consumption is low; But the limitation of spouted bed drying method be can be spouted bed height less, and the drier that is specifically designed to spouted bed drying method is difficult to amplify, because of practical application before this more be fluidized bed drying method.
And the equipment that stacking bed (or claiming fixed bed) drying means uses has advantage simple in structure, cheap, easy to use; And the major defect uniformity that to be cereal dry is lower, the moisture of paddy layer top and bottom is poor larger.Available technology adopting commutation is ventilated and is improved the problem that cereal drying uniformity is low, but in the time that thickness of bed layer reaches 20cm, its rate of drying can decline.
In fluidized bed drying method, cereal-granules strenuous exercise, can contact with drying medium fully, fully exchange between particle, and the heat and mass efficiency between particle and drying medium is high, and cereal-granules layer temperature is even, has greatly improved drying efficiency and drying quality.Existing fluidized bed drying method, the stacking bed drying means of comparing can reduce by 50% energy consumption.But in the Grain Drying Process later stage, the wet diffusion of cereal-granules inside is control procedure, and power consumption too high in fluidized bed drying method reduces greatly to the facilitation of dry run, and the high-quality of fluidized bed drying method causes energy resource consumption high.In addition, cereal continues to be unfavorable in fluidization the hygroscopic water homogenising of cereal-granules inside, easily in cereal-granules, causes stress.When cereal-granules surf zone humidity is during lower than critical value, may cause particle explosion, cause grain quality to reduce.
In prior art, in fluidized bed drying method, introducing vibration can make stratum granulosum under the wind speed lower than critical fludization velocity, have good mobility, and further improving heat exchange efficiency, reduction heat exhaustion and power consumption, existing achievement in research shows that its energy consumption is about 55% of normal flow fluidized bed drying method.But vibra fluidized bed drying method still can not solve thick-layer, the particularly large thick-layer uniform drying problem when dry.In addition, although the required wind speed of fluidized bed drying method that the needed wind speed of vibra fluidized bed drying method excites than friction is little, but for ensureing the fluidisation of stratum granulosum, reducing of wind speed is limited, its heat providing as drying medium still may exceed cereal-granules moisture and remove the needed heat of process, particularly even more serious in the dry run later stage.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of thick-layer grain drying system and the method that can either save the energy and can improve again cereal drying effect and drying efficiency.
For solving the problems of the technologies described above, embodiments of the invention provide a kind of thick-layer grain drying system of be coupled alternating temperature alternation air-flow and vibration, comprise hothouse, and the top of described hothouse and bottom are respectively equipped with top wind pushing hole and end wind pushing hole; Also comprise system for detecting temperature, supply air system; Wherein said system for detecting temperature comprises and is arranged at the top temperature measurement device at Grain-Layer to be dried top in hothouse, the bottom thermal detector of bottom, the middle part thermal detector at middle part; Wherein said supply air system comprises heater, pressure fan, temperature control module, air-supply control module; Wherein said pressure fan respectively with top wind pushing hole and end wind pushing hole conducting, described temperature control module connects described system for detecting temperature, and connects described air-supply control module so that described air-supply control module is described top wind pushing hole or the air-supply of end wind pushing hole according to pressure fan described in the testing result control of described system for detecting temperature.
Wherein, described pressure fan connects described top wind pushing hole, end wind pushing hole by commutator, so that the air outlet of described pressure fan and described top wind pushing hole or end wind pushing hole conducting.
Wherein, described supply air system can also adopt two blower fan double-heater patterns, thereby simplifies handoff procedure.
Wherein, described heater is provided with temperature-regulating module to adjust the heating-up temperature of described heater.
Wherein, in described hothouse, be provided with vibrating mechanism and apply vibration with the thick-layer cereal in described hothouse.If do not needed continuous discharge can not apply vibration, but uniform drying decreases.
Wherein, described hothouse also connects the heat exchanger for reclaiming waste gas residual heat.
Wherein, described hothouse also comprises gas exhaust piping, and described gas exhaust piping is provided with for detection of waste gas humidity with according to the dust humidity detection system of humidity regulation waste gas circulation amount.
Meanwhile, the embodiment of the present invention has also proposed a kind of thick-layer method for drying cereal of be coupled alternating temperature alternation air-flow and vibration, comprising:
Hothouse is sent into forward high temperature drying gas until the temperature that middle part thermal detector records reaches default baking temperature; Gas temperature is reduced and sends into middle temperature tempering gas, until the temperature that the thermal detector of opposite end records also reaches default baking temperature; Now change gas direction, hothouse is sent into reverse high temperature drying gas until the temperature that middle part thermal detector records reaches default baking temperature; Gas temperature is reduced and sends into middle temperature tempering gas, until the temperature that the thermal detector of opposite end records also reaches default baking temperature; So repeat, until cereal water capacity reaches default water capacity in hothouse.
Concrete, described method is:
Step 1, utilize top wind pushing hole or the end wind pushing hole of pressure fan to described hothouse to send into high temperature drying air-flow to the thick-layer cereal in described hothouse; Read the Current Temperatures reading of middle part thermal detector, after the temperature reading of described middle part thermal detector reaches default baking temperature, utilize pressure fan to pass into middle temperature tempering air-flow to current wind pushing hole; After the thermal detector of the opposite side relative with current wind pushing hole also reaches default baking temperature, stop current wind pushing hole to blow;
Step 2, utilize pressure fan to send into high temperature drying air-flow to the wind pushing hole of the relative opposite side of the current wind pushing hole in step 1; Read the Current Temperatures reading of middle part thermal detector, after the temperature reading of described middle part thermal detector reaches default baking temperature, utilize pressure fan to pass into middle temperature tempering air-flow to the wind pushing hole of described opposite side; After the thermal detector of wind pushing hole one side in step 1 also reaches default baking temperature, stop the wind pushing hole of described opposite side to blow;
Step 3, judge whether the cereal in described hothouse reaches default water capacity, and if it is step finishes, if otherwise return to step 1.
Wherein, the temperature of described high temperature drying air-flow is 60 DEG C～200 DEG C; The temperature of described middle temperature tempering air-flow is 25 DEG C～80 DEG C.
Wherein, the temperature of described high temperature drying air-flow is 60 DEG C～200 DEG C; And described default baking temperature than the temperature of described high temperature drying air-flow low 0.1 DEG C～10 DEG C.
Wherein, described method also comprises: when dry, can apply vibration to described thick-layer cereal, if do not needed continuous discharge can not apply vibration, but uniform drying decreases.
Wherein, described method also comprises: the internal circulating load that regulates waste gas according to the humidity of dried waste gas.
Wherein, described method also comprises: dried waste gas, before entering atmosphere, utilizes new wind to reclaim the waste heat of waste gas by heat exchanger, realizes waste heat recovery to greatest extent.
The beneficial effect of technique scheme of the present invention is as follows:
In such scheme, enter heat, gas flow temperature and the airflow direction of hothouse according to the Heat and Mass Transfer Characteristics control of cereal-granules inside, heat input is matched with cereal Drying Dynamics process.Utilize the air-flow of direction-changeable and temperature to be dried cereal, can obtain better dry mass, higher drying efficiency, lower energy consumption for drying.The present invention has that high, the dry and tempering process of unit volume drying equipment output is unifiedly connected, energy consumption is low, rate of drying is fast, dry products quality is high, can continuous drying etc. advantage.In the present invention, adopt the control of air-flow alternating temperature, introduce tempering process, mild wet part of gradient of cereal-granules inside, has reduced the stress in cereal-granules, and then has reduced the quick-fried waist of cereal-granules and the situation of breaking, and has finally improved product quality.In the present invention, adopt the control of alternation air-flow, in improving dry mass, can be used for dry heat by changing airflow direction reservation, improve to greatest extent energy utilization rate.
Brief description of the drawings
Fig. 1 is the structural representation of the coupling alternating temperature alternation air-flow of the embodiment of the present invention and the thick-layer grain drying system of vibration;
Fig. 2 is the structural representation after the system commutation air-supply in Fig. 1;
Fig. 3 is the process schematic diagram while utilizing the method for the embodiment of the present invention to be dried thick-layer wheat.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is directed to the large problem of existing method for drying cereal energy consumption, the problem of particularly wasting mass energy at thick-layer cereal or large thick-layer cereal when dry, provides a kind of thick-layer method for drying cereal of be coupled alternating temperature alternation air-flow and vibration.
As depicted in figs. 1 and 2, the coupling alternating temperature alternation air-flow of the embodiment of the present invention and the thick-layer method for drying cereal of vibration comprise: for solving the problems of the technologies described above, embodiments of the invention provide a kind of thick-layer grain drying system of be coupled alternating temperature alternation air-flow and vibration, comprise hothouse, the top of described hothouse and bottom are respectively equipped with top wind pushing hole and end wind pushing hole; Also comprise system for detecting temperature, supply air system; Wherein said system for detecting temperature comprises and is arranged at the top temperature measurement device at Grain-Layer to be dried top in hothouse, the bottom thermal detector of bottom, the middle part thermal detector at middle part; Wherein said supply air system comprises heater, pressure fan, temperature control module, air-supply control module; Wherein said pressure fan respectively with top wind pushing hole and end wind pushing hole conducting, described temperature control module connects described system for detecting temperature, and connects described air-supply control module so that described air-supply control module is described top wind pushing hole or the air-supply of end wind pushing hole according to pressure fan described in the testing result control of described system for detecting temperature.The concrete dust humidity detection system that is arranged at gas exhaust piping that also comprises, for detection of the humidity of waste gas, can regulate according to this humidity the internal circulating load of waste gas.Wherein, in order to realize commutation air-supply, described pressure fan connects described top wind pushing hole, end wind pushing hole by commutator, so that the air outlet of described pressure fan and described top wind pushing hole or end wind pushing hole conducting.
Owing to not only will realizing commutation air-supply in the present invention, also need constantly to change the temperature of air-supply, therefore described heater is provided with temperature-regulating module to adjust the heating-up temperature of described heater.Concrete method of temperature control can be with reference to following method.
For continuous drying, in described hothouse, be provided with vibrating mechanism and vibrate with the thick-layer cereal in described hothouse.If do not require that continuity is dried and discharging, also can not introduce vibration in dry run.
Wherein, described hothouse also comprises the dust humidity detection system that is arranged at gas exhaust piping, for detection of the humidity of waste gas after dry, can regulate according to this humidity the internal circulating load of waste gas, thereby reduces the waste of waste gas residual heat.
Wherein, described hothouse also connects the heat exchanger for reclaiming waste gas residual heat, to utilize waste heat to carry out other application, prevents energy waste.
First the present invention can pass into heated air stream from hothouse bottom as required in the time that dry run starts, and also can first pass into heated air stream from hothouse top.
Wherein, in the present invention, origin of heat comprises electricity, coal, oil and gas, and can regulate heating load according to dry demand, realizes the alternating temperature control of dry run.Cereal described in the present invention comprises wheat, paddy rice, barley, Chinese sorghum, mung bean, buckwheat etc.In the present invention, dry indoor air velocity can pass through Frequency Converter Control, and wind speed range is at 0.1m/s～20m/s.The source involving vibrations motor or the special vibrator that in the present invention, vibrate, vibration frequency can be adjustable continuously within the scope of 0Hz～150Hz.In the present invention, in hothouse, cereal bed thickness is 2mm～1500mm.In the present invention, the lower end of hothouse and upper end have bellows, between bellows and hothouse, have air distribution plate, have fluidization technology heat and mass evenly, heat and mass transfer coefficient advantages of higher.In the present invention, have airflow-reversing valve at hothouse front end, forward and the inverted draft realized in dry run are dried.In the present invention, can regulate according to the humidity of dried waste gas the internal circulating load of waste gas.The present invention, before exhaust is entering atmosphere, utilizes new wind to reclaim the waste heat of waste gas by heat exchanger, realizes waste heat recovery to greatest extent, improves energy utilization rate.The present invention, before exhaust is entering atmosphere, also can utilize heat pump techniques to reclaim sensible heat and the latent heat of exhaust simultaneously.The present invention has insulating at hothouse and pipeline outer wall, can reduce hothouse and pipeline and environment heat exchange, reduces thermal losses.
Meanwhile, the embodiment of the present invention has also proposed the coupling alternating temperature alternation air-flow of a kind of application system as described in front any one and the thick-layer method for drying cereal of vibration, comprising:
Step 1, utilize top wind pushing hole or the end wind pushing hole of pressure fan to described hothouse to send high temperature drying air-flow to the thick-layer cereal in described hothouse; Read the Current Temperatures reading of middle part thermal detector, after the temperature reading of described middle part thermal detector reaches default baking temperature, utilize pressure fan to pass into middle temperature tempering air-flow to current wind pushing hole; After the thermal detector of the opposite side relative with current wind pushing hole also reaches default baking temperature, stop current wind pushing hole to blow;
Step 2, utilize pressure fan to send high temperature drying air-flow to the wind pushing hole of the relative opposite side of the current wind pushing hole in step 1; Read the Current Temperatures reading of middle part thermal detector, after the temperature reading of described middle part thermal detector reaches default baking temperature, utilize pressure fan to pass into middle temperature tempering air-flow to the wind pushing hole of described opposite side; After the thermal detector of wind pushing hole one side in step 1 also reaches default baking temperature, stop the wind pushing hole of described opposite side to blow;
Step 3, judge whether the cereal in described hothouse reaches default water capacity, and if it is step finishes, if otherwise return to step 1.
Wherein, the temperature of described high temperature drying air-flow is 60 DEG C～200 DEG C; The temperature of described middle temperature tempering air-flow is 25 DEG C～80 DEG C.
Wherein, the temperature of described high temperature drying air-flow is 60 DEG C～200 DEG C; And described default baking temperature than the temperature of described high temperature drying air-flow low 0.1 DEG C～10 DEG C.
Wherein, described method also comprises: when dry, can apply vibration to described thick-layer cereal, if do not needed continuous discharge can not apply vibration, but uniform drying decreases.
Wherein, described method also comprises: the internal circulating load that regulates waste gas according to the humidity of dried waste gas.
Wherein, described method also comprises: dried waste gas, before entering atmosphere, utilizes new wind to reclaim the waste heat of waste gas by heat exchanger, realizes waste heat recovery to greatest extent.
First to blow as example from end wind pushing hole, method of the present invention is specially:
First pass into dry needed high temperature drying air-flow from the end wind pushing hole of below to hothouse Grain-Layer; At hothouse middle part, temperature point temperature reaches after the baking temperature of setting, changes into and passes into middle temperature tempering air-flow, the bottom Grain-Layer tempering on the spot that high-temperature heating is crossed; And middle warm air cements out the heat of high temperature cereal-granules to improve self temperature, for the cereal-granules on dry kiln top.
After top Grain-Layer reaches a high temperature, hothouse upper temp measuring point temperature reaches after the baking temperature of setting, changes airflow direction and gas flow temperature, passes into high temperature drying air-flow from top wind pushing hole, realizes from heating in the other direction and dried grain layer.When hothouse middle part, temperature point temperature reaches after the baking temperature of setting, again change into pass into from top wind pushing hole to hothouse warm tempering air-flow top cereal is carried out to the displacement of tempering and heat, until hothouse temperature of lower measuring point temperature reaches the baking temperature of setting.
Repeat said process, experience successively cyclic drying and the tempering process of high temperature positive draft, middle temperature positive draft, high temperature inverted draft, middle temperature inverted draft, until cereal reaches default water capacity (can be 13%).
By several instantiations, the present invention is further described below.
Under the alternating temperature alternation air-flow cereal drying mode proposing in the present invention, we claim that each one-way gas flow dry run is an arid cycle, and its operation characteristic comprises following two features:
(1), within each arid cycle, drying medium temperature becomes T tempering from T hot blast;
(2) every through changing airflow direction an arid cycle.
The startup stage that dry plan can being divided into and the operation phase, first arid cycle, the startup stage of being, be the operation phase arid cycle subsequently, and according to the established rule operation that moves in circles.Be dried as example first to carry out positive draft, dry run specifically as shown in Figure 3: startup stage (t1 to t6 moment in Fig. 3), the flow process of first arid cycle that this stage is alternation alternating temperature drying mode while bringing into operation.
First steps A, cereal are successively heated by unidirectional heat wind streamwise, form temperature wave as shown in t1 to the t3 moment in Fig. 3 and distribute, hot blast temperature T hot blast, environment temperature T normal temperature.
Step B, in the time that hothouse middle part temperature point reaches T hot blast, reduce temperature of incoming flow to T tempering, as shown in t3, t4 moment in Fig. 3.
Step C, temperature is that the middle temperature tempering air-flow of T tempering is heated by bottom cereal-granules in the bed that reaches T hot blast subsequently, and for heating rear portion in the top of T normal temperature bed, bed cereal-granules temperature wave progressively advances to top along airflow direction, as shown in t4 to the t6 moment in Fig. 3.Now the cereal bed on top, in T tempering, is realized cooling tempering process.
Under above-mentioned heating mode, before each one-way gas flow dry run, the half period is utilized bottom bed cereal in heated-air drying hothouse, and the later half cycle is reduced incoming flow gas temperature, and utilizes the dry rear portion of the amount of stored heat bed cereal of bottom bed cereal.Compared with dry with thin layer cereal, in this dry run, heat is dry for thick-layer cereal, can reduce to greatest extent the temperature of emission gases, realizes energy-conservation effect.But the cooling of later half cycle hothouse bottom bed cereal must meet simultaneously:
(1) wind-warm syndrome is after T hot blast becomes T tempering, formerly must meet the hydrofuge institute calorific requirement requirement in the top of T normal temperature bed cereal in the bottom of the T hot blast cereal bed heat providing of lowering the temperature;
(2) wind-warm syndrome is after T hot blast becomes T tempering, and heating-up temperature and speed must meet the temperature and time requirement of hothouse bottom bed cereal tempering process.
Operation phase (t7 to t9 moment in Fig. 3), this stage is the flow process that system enters each arid cycle after normal operating phase.
Step D, reach after T hot blast when the superiors' cereal-granules in hothouse, as the t6 moment in Fig. 3, change airflow direction and gas flow temperature and maintain T hot blast, in hothouse, supplement moisture evaporation institute consumption of calorie in last cycle cereal, as the t7 moment in Fig. 3.
Step e, in the time that middle part temperature point reaches T hot blast, reduce temperature of incoming flow to T tempering, as shown in t8, t9 moment in Fig. 3.
Step F, in dry run subsequently, the above-mentioned running of mirror image can be realized the alternation alternating temperature dry run of cereal.
In dry run, introduce vibration, by controlling vibration condition and the flow conditions of granular system, realize DYNAMIC DISTRIBUTION and the convective motion of controlling particle, improve uniform drying or further improve thickness of feed layer.
It is below the thick-layer method for drying cereal that an example specifically describes coupling alternating temperature alternation air-flow provided by the invention and vibration.
The thick-layer cereal drying experiment platform of building a set of coupling alternating temperature alternation air-flow and vibration, comprises hothouse, airflow-reversing device, air-supply arrangement, heater, vibrating device, waste-heat recovery device etc.In hothouse, put into wheat, material bed thickness 15cm.
First open vibrating device, amplitude and vibration frequency are separately fixed to 1mm and 30Hz.
Open blower fan and electric heater simultaneously, gas flow temperature is adjusted to 60 DEG C, air velocity is adjusted to 1m/s;
In the time that hothouse middle part temperature point reaches 59.8 DEG C, changing gas flow temperature is 40 DEG C;
In the time that the hothouse distal-most end temperature along this dry gas stream direction reaches 59.8 DEG C, change airflow direction, and gas flow temperature is adjusted to 60 DEG C;
In the time that hothouse middle part temperature point reaches 59.8 DEG C again, changing gas flow temperature is 40 DEG C;
In the time that the hothouse distal-most end temperature along this dry gas stream direction reaches 59.8 DEG C, again change airflow direction, and gas flow temperature is adjusted to 60 DEG C;
Constantly repeat said process, until the experiment lower than 13% time of the water capacity of wheat finishes.
By this drying means drying wheat, the dry mass of wheat is high, and rate of drying is fast, and energy consumption for drying is low.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (13)
1. the be coupled thick-layer grain drying system of alternating temperature alternation air-flow and vibration, comprises hothouse, it is characterized in that, the top of described hothouse and bottom are respectively equipped with top wind pushing hole and end wind pushing hole; Also comprise system for detecting temperature, supply air system; Wherein said system for detecting temperature comprises and is arranged at the top temperature measurement device at Grain-Layer to be dried top in hothouse, the bottom thermal detector of bottom, the middle part thermal detector at middle part; Wherein said supply air system comprises heater, pressure fan, temperature control module, air-supply control module; Wherein said pressure fan respectively with top wind pushing hole and end wind pushing hole conducting, described temperature control module connects described system for detecting temperature, and connects described air-supply control module so that described air-supply control module is described top wind pushing hole or the air-supply of end wind pushing hole according to pressure fan described in the testing result control of described system for detecting temperature.
2. the thick-layer grain drying system of coupling alternating temperature alternation air-flow according to claim 1 and vibration, it is characterized in that, described pressure fan connects described top wind pushing hole, end wind pushing hole by commutator, so that the air outlet of described pressure fan and described top wind pushing hole or end wind pushing hole conducting.
3. the thick-layer grain drying system of coupling alternating temperature alternation air-flow according to claim 1 and vibration, is characterized in that, described supply air system can also adopt two blower fan double-heater patterns, thereby simplifies handoff procedure.
4. the thick-layer grain drying system of coupling alternating temperature alternation air-flow according to claim 1 and vibration, is characterized in that, described heater is provided with temperature control module to adjust the heating-up temperature of described heater.
5. the thick-layer grain drying system of coupling alternating temperature alternation air-flow according to claim 1 and vibration, is characterized in that, is provided with vibrating mechanism and vibrates with the thick-layer cereal in described hothouse in described hothouse.
6. the thick-layer grain drying system of coupling alternating temperature alternation air-flow according to claim 1 and vibration, is characterized in that, described hothouse also connects the heat exchanger for reclaiming waste gas residual heat.
7. the thick-layer grain drying system of coupling alternating temperature alternation air-flow according to claim 1 and vibration, it is characterized in that, described hothouse also comprises gas exhaust piping, and described gas exhaust piping is provided with for detection of waste gas humidity with according to the dust humidity detection system of humidity regulation waste gas circulation amount.
8. the be coupled thick-layer method for drying cereal of alternating temperature alternation air-flow and vibration, comprising:
Step 1, utilize top wind pushing hole or the end wind pushing hole of pressure fan to described hothouse to send into high temperature drying air-flow to the thick-layer cereal in described hothouse; Read the Current Temperatures reading of middle part thermal detector, after the temperature reading of described middle part thermal detector reaches default baking temperature, utilize pressure fan to pass into middle temperature tempering air-flow to current wind pushing hole; After the thermal detector of the opposite side relative with current wind pushing hole also reaches default baking temperature, stop current wind pushing hole to blow;
Step 2, utilize pressure fan to send into high temperature drying air-flow to the wind pushing hole of the relative opposite side of the current wind pushing hole in step 1; Read the Current Temperatures reading of middle part thermal detector, after the temperature reading of described middle part thermal detector reaches default baking temperature, utilize pressure fan to pass into middle temperature tempering air-flow to the wind pushing hole of described opposite side; After the thermal detector of wind pushing hole one side in step 1 also reaches default baking temperature, stop the wind pushing hole of described opposite side to blow;
Step 3, judge whether the cereal in described hothouse reaches default water capacity, and if it is step finishes, if otherwise return to step 1.
9. the thick-layer method for drying cereal of coupling alternating temperature alternation air-flow according to claim 8 and vibration, is characterized in that, the temperature of described high temperature drying air-flow is 60 DEG C～200 DEG C; The temperature of described middle temperature tempering air-flow is 25 DEG C～80 DEG C.
10. the thick-layer method for drying cereal of coupling alternating temperature alternation air-flow according to claim 8 and vibration, is characterized in that, the temperature of described high temperature drying air-flow is 60 DEG C～200 DEG C; And described default baking temperature than the temperature of described high temperature drying air-flow low 0.1 DEG C～10 DEG C.
The thick-layer method for drying cereal of 11. coupling alternating temperature alternation air-flows according to claim 8 and vibration, is characterized in that, described method also comprises: when dry, can apply vibration to described thick-layer cereal.
The thick-layer method for drying cereal of 12. coupling alternating temperature alternation air-flows according to claim 8 and vibration, is characterized in that, described method also comprises: the internal circulating load that regulates waste gas according to the humidity of dried waste gas.
The thick-layer method for drying cereal of 13. coupling alternating temperature alternation air-flows according to claim 8 and vibration, it is characterized in that, described method also comprises: dried waste gas, before entering atmosphere, utilizes new wind to reclaim the waste heat of waste gas by heat exchanger, realizes waste heat recovery to greatest extent.
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| CN201410354431.8A CN104101200B (en) | 2014-07-23 | 2014-07-23 | A kind of thick-layer grain drying system of be coupled alternating temperature alternation air-flow and vibration and method |
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| CN105135856A (en) * | 2015-08-12 | 2015-12-09 | 北京科技大学 | Variable-temperature alternating airflow crossflow type thick-layer wet material drying system and method |
| CN108709410A (en) * | 2018-03-26 | 2018-10-26 | 无锡东宝科技发展有限公司 | cheese dehydration dryer |
| CN113639531A (en) * | 2021-08-25 | 2021-11-12 | 安徽金锡机械科技有限公司 | Hot air supply system for grain drying machine and grain drying machine |
| CN114442703A (en) * | 2020-11-04 | 2022-05-06 | 中国科学院理化技术研究所 | Control method and control system of closed drying system |
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| CN105135856A (en) * | 2015-08-12 | 2015-12-09 | 北京科技大学 | Variable-temperature alternating airflow crossflow type thick-layer wet material drying system and method |
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| CN114442703A (en) * | 2020-11-04 | 2022-05-06 | 中国科学院理化技术研究所 | Control method and control system of closed drying system |
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| CN113639531B (en) * | 2021-08-25 | 2022-09-16 | 安徽金锡机械科技有限公司 | Hot air supply system for grain drying machine and grain drying machine |
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| CN104101200B (en) | 2016-01-20 |
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