CN104101200B - A kind of thick-layer grain drying system of be coupled alternating temperature alternation air-flow and vibration and method - Google Patents
A kind of thick-layer grain drying system of be coupled alternating temperature alternation air-flow and vibration and method Download PDFInfo
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- CN104101200B CN104101200B CN201410354431.8A CN201410354431A CN104101200B CN 104101200 B CN104101200 B CN 104101200B CN 201410354431 A CN201410354431 A CN 201410354431A CN 104101200 B CN104101200 B CN 104101200B
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- temperature
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- wind pushing
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Classifications
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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
- 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
Description
Technical field
The present invention relates to the grains such as cereal and deposit technical field, refer to a kind of thick-layer grain drying system and method for be coupled alternating temperature alternation air-flow and vibration especially.
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 grain dry means fall behind, it is estimated that the cereal had every year up to grain yield 5% is 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, China's total output of grain in 2013 60194 ten thousand tons, loses up to 3009.7 ten thousand tons.And l.0kg moisture falls in China's drying needs energy consumption 5000-8000kJ, this index of developed country is only 3344-4598kJ, and China's grain dry energy consumption is about the twice of developed country.
The essence of grain dry is the transmittance process of the complicated caloic coupling of granular system under drying medium effect, and in dry run, make the water capacity of cereal be reduced to about 14%, is beneficial to safe storage.At present, the grain dry technology of practical application mainly contains stacking bed, fluid bed, spouted bed drying and these technology combination.
Fluidized bed drying method has the high advantage of rate of drying, and spouted bed drying method has the low advantage of energy consumption; But the limitation of spouted bed drying method be can be spouted bed height less, and the drier being specifically designed to spouted bed drying method be 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 structure advantage simple, cheap, easy to use; And major defect to be the uniformity of grain dry lower, paddy layer top is larger with the moisture difference of bottom.Adopt air direction reversals to improve the low problem of the grain dry uniformity in prior art, but when thickness of bed layer reaches 20cm, its rate of drying can decline.
In fluidized bed drying method, cereal-granules strenuous exercise, can contact fully with drying medium, fully exchange between particle, and the heat and mass efficiency between particle and drying medium is high, and cereal-granules layer homogeneous temperature, substantially increases drying efficiency and drying quality.Existing fluidized bed drying method, stacking bed drying means of comparing can reduce the energy consumption of 50%.But in the Grain Drying Process later stage, the wet diffusion of cereal-granules inside is control procedure, and the facilitation of power consumption too high in fluidized bed drying method to dry run reduces greatly, and the high-quality of fluidized bed drying method causes energy resource consumption high.In addition, cereal continues to be in the hygroscopic water homogenising that fluidization is unfavorable for cereal-granules inside, easily in cereal-granules, causes stress.When cereal-granules surf zone humidity is lower than critical value, particle may be caused to burst, cause grain quality to reduce.
Introducing vibration in prior art in fluidized bed drying method can make stratum granulosum have good mobility under lower than the wind speed of critical fludization velocity, and improving heat exchange efficiency, reduction heat exhaustion and power consumption further, existing achievement in research shows that its energy consumption is about 55% of Conventional fluidization bed drying method.Uniform drying sex chromosome mosaicism when but vibra fluidized bed drying method still can not solve thick-layer, particularly large thick-layer is dry.In addition, although wind speed is little needed for the fluidized bed drying method that the wind speed required for vibra fluidized bed drying method excites than friction, but for ensureing the fluidisation of stratum granulosum, the reduction of wind speed is limited, its heat provided as drying medium still may remove heat required for process beyond cereal-granules moisture, and particularly the phase is even more serious after drying process.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind ofly can either save thick-layer grain drying system and the method that the energy can improve again grain dry 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 the top temperature measurement device, the bottom temperature detector of bottom, the middle part thermal detector at middle part that are arranged at Grain-Layer top to be dried in hothouse; Wherein said supply air system comprises heater, pressure fan, temperature control module, air blowing 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 connect described air blowing control module with make described air blowing control module according to the testing result of described system for detecting temperature control described pressure fan be described top wind pushing hole or the end wind pushing hole air-supply.
Wherein, described pressure fan connects described top wind pushing hole, end wind pushing hole by commutator, to make 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 fans double-heater pattern, thus simplifies handoff procedure.
Wherein, described heater is provided with temperature-regulating module to adjust the heating-up temperature of described heater.
Wherein, vibrating mechanism is provided with in described hothouse to apply vibration to the thick-layer cereal in described hothouse.If do not needed continuous discharge then 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 detecting waste gas humidity with the dust humidity detection system according to humidity regulation waste gas circulation amount.
Meanwhile, the embodiment of the present invention also proposed a kind of thick-layer method for drying cereal of be coupled alternating temperature alternation air-flow and vibration, comprising:
Forward high-temperature dry air is sent into until the temperature that middle part thermal detector records reaches default baking temperature to hothouse; Gas temperature is reduced warm tempering gas in sending into, until the temperature that the thermal detector of opposite end records also reaches default baking temperature; Now change gas direction, reverse high-temperature dry air is sent into hothouse until the temperature that middle part thermal detector records reaches default baking temperature; Gas temperature is reduced warm tempering gas in sending into, until the temperature that the thermal detector of opposite end records also reaches default baking temperature; Repetition like this, until cereal water capacity reaches default water capacity in hothouse.
Concrete, described method is:
Step 1, pressure fan is utilized to send into high temperature drying air-flow to the top wind pushing hole of described hothouse or end wind pushing hole 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; When after the baking temperature that the thermal detector of the opposite side relative with current wind pushing hole also reaches default, stop blowing to current wind pushing hole;
Step 2, pressure fan is utilized 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 the wind pushing hole of pressure fan to described opposite side to pass into middle temperature tempering air-flow; After the thermal detector of the wind pushing hole side in step 1 also reaches default baking temperature, stop blowing to the wind pushing hole of described opposite side;
Whether step 3, the cereal judged in described hothouse reach default water capacity, and if it is step terminates, if otherwise return 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 lower than the temperature of described high temperature drying air-flow 0.1 DEG C ~ 10 DEG C.
Wherein, described method also comprises: can apply vibration when drying to described thick-layer cereal, and if do not needed continuous discharge then can not apply vibration, but uniform drying decreases.
Wherein, described method also comprises: the internal circulating load regulating waste gas according to the humidity of dried waste gas.
Wherein, described method also comprises: dried waste gas, before entering air, 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, control to enter the heat of hothouse, gas flow temperature and airflow direction according to the Heat and Mass Transfer Characteristics of cereal-granules inside, heat input is matched with grain dry dynamic process.Utilize the air-flow of direction-changeable and temperature to carry out drying to cereal, better dry mass, higher drying efficiency, lower energy consumption for drying can be obtained.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 the advantage such as continuous drying.Adopt air-flow alternating temperature to control in the present invention, introduce tempering process, mild wet part gradient of cereal-granules inside, reduces the stress in cereal-granules, and then decreases quick-fried waist and the rupture event of cereal-granules, ultimately improve product quality.Adopt alternation gas flow optimized in the present invention, while improving dry mass, retaining by changing airflow direction the heat that can be used for drying, improving energy utilization rate to greatest extent.
Accompanying drawing explanation
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 process schematic when utilizing the method for the embodiment of the present invention to carry out drying to thick-layer wheat.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is directed to the problem that existing method for drying cereal energy consumption is large, particularly waste the problem of mass energy when thick-layer cereal or large thick-layer grain dry, a kind of thick-layer method for drying cereal of be coupled alternating temperature alternation air-flow and vibration is provided.
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 the top temperature measurement device, the bottom temperature detector of bottom, the middle part thermal detector at middle part that are arranged at Grain-Layer top to be dried in hothouse; Wherein said supply air system comprises heater, pressure fan, temperature control module, air blowing 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 connect described air blowing control module with make described air blowing control module according to the testing result of described system for detecting temperature control described pressure fan be described top wind pushing hole or the end wind pushing hole air-supply.Concrete also comprises the dust humidity detection system being arranged at gas exhaust piping, for detecting the humidity of waste gas, can regulate the internal circulating load of waste gas according to this humidity.Wherein, in order to realize commutation air-supply, described pressure fan connects described top wind pushing hole, end wind pushing hole by commutator, to make the air outlet of described pressure fan and described top wind pushing hole or end wind pushing hole conducting.
Owing to not only will realize commutation air-supply in the present invention, also need the temperature constantly changing 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 with reference to following method.
In order to continuous drying, be provided with vibrating mechanism in described hothouse to vibrate the thick-layer cereal in described hothouse.If do not require continuity drying and discharging, in dry run, also vibration can not be introduced.
Wherein, described hothouse also comprises the dust humidity detection system being arranged at gas exhaust piping, for detecting the humidity of dry rear waste gas, can regulate the internal circulating load of waste gas, thus reduce the waste of waste gas residual heat according to this humidity.
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 when dry run starts as required bottom hothouse, also first can 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, and the alternating temperature realizing dry run controls.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 vibrated in the present invention or special vibrator, vibration frequency can within the scope of 0Hz ~ 150Hz continuously adjustabe.In the present invention, in hothouse, cereal thickness is 2mm ~ 1500mm.In the present invention, the lower end of hothouse and upper end have bellows, have air distribution plate between bellows and hothouse, have fluidization technology heat and mass evenly, heat and mass transfer coefficient advantages of higher.There is airflow-reversing valve in hothouse front end in the present invention, realize the forward in dry run and inverted draft drying.The internal circulating load of waste gas can be regulated according to the humidity of dried waste gas in the present invention.The present invention in exhaust, utilizes new wind to reclaim the waste heat of waste gas by heat exchanger, realizes waste heat recovery to greatest extent before entering air, improves energy utilization rate.The present invention before entering air, also can utilize heat pump techniques to reclaim sensible heat and the latent heat of exhaust in 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 also proposed a kind of application the coupling alternating temperature alternation air-flow of system and thick-layer method for drying cereal of vibration as described in front any one, comprising:
Step 1, pressure fan is utilized to send high temperature drying air-flow to the top wind pushing hole of described hothouse or end wind pushing hole 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; When after the baking temperature that the thermal detector of the opposite side relative with current wind pushing hole also reaches default, stop blowing to current wind pushing hole;
Step 2, the wind pushing hole of pressure fan to the relative opposite side of the current wind pushing hole in step 1 is utilized to send high temperature drying air-flow; 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 the wind pushing hole of pressure fan to described opposite side to pass into middle temperature tempering air-flow; After the thermal detector of the wind pushing hole side in step 1 also reaches default baking temperature, stop blowing to the wind pushing hole of described opposite side;
Whether step 3, the cereal judged in described hothouse reach default water capacity, and if it is step terminates, if otherwise return 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 lower than the temperature of described high temperature drying air-flow 0.1 DEG C ~ 10 DEG C.
Wherein, described method also comprises: can apply vibration when drying to described thick-layer cereal, and if do not needed continuous discharge then can not apply vibration, but uniform drying decreases.
Wherein, described method also comprises: the internal circulating load regulating waste gas according to the humidity of dried waste gas.
Wherein, described method also comprises: dried waste gas, before entering air, utilizes new wind to reclaim the waste heat of waste gas by heat exchanger, realizes waste heat recovery to greatest extent.
First to blow from end wind pushing hole, method of the present invention is specially:
First end wind pushing hole from below passes into the high temperature drying air-flow required for drying to hothouse Grain-Layer; After temperature point temperature in portion's reaches the baking temperature of setting in the drying chamber, change into and pass into middle temperature tempering air-flow, the bottom Grain-Layer tempering on the spot that high-temperature heating is crossed; And the heat of high temperature cereal-granules is cemented out raising own temperature by middle warm air, for the cereal-granules on dry kiln top.
After top Grain-Layer reaches a high temperature, after namely hothouse upper temp measuring point temperature reaches the baking temperature of setting, changing airflow direction and gas flow temperature, pass into high temperature drying air-flow from top wind pushing hole, realizing from heating in the other direction and dried grain layer.After hothouse middle portion temperature measuring point temperature reaches the baking temperature of setting, again change into from top wind pushing hole to hothouse pass into middle temperature tempering air-flow to top cereal carry out tempering and heat displacement, until hothouse temperature of lower measuring point temperature reaches the baking temperature of setting.
Repeat said process, namely experience high temperature positive draft, middle temperature positive draft, high temperature inverted draft, the cyclic drying of middle temperature inverted draft and tempering process successively, until cereal reaches default water capacity (can be 13%).
Below by way of several instantiation, the present invention is further described.
Under the alternating temperature alternation air-flow grain dry pattern that the present invention proposes, we claim each one-way gas flow dry run to be 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) often airflow direction is changed through an arid cycle.
The startup stage that dry plan can being divided into and the operation phase, the startup stage that first arid cycle being, arid cycle is subsequently the operation phase, and to move in circles operation according to established rule.Dry first to carry out positive draft, dry run specifically as shown in Figure 3: startup stage (in Fig. 3 t1 to t6 moment), the flow process of first arid cycle that this stage is alternation alternating temperature drying mode when bringing into operation.
First steps A, cereal are successively heated by unidirectional heat wind streamwise, form temperature wave distribution as shown in t1 to the t3 moment in Fig. 3, hot blast temperature T hot blast, environment temperature T normal temperature.
Step B, when portion's temperature point reaches T hot blast in the drying chamber, reduce temperature of incoming flow to T tempering, as shown in t3, t4 moment in Fig. 3.
Step C, subsequently temperature are that the middle temperature tempering air-flow of T tempering is heated by bottom cereal-granules in the bed reaching T hot blast, and the top bed of T normal temperature is in for heating rear portion, bed cereal-granules temperature wave progressively advances to top, as shown in t4 to the t6 moment in Fig. 3 along airflow direction.Now the cereal bed on top is in T tempering, realizes ventilation tempering process.
Under above-mentioned heating mode, before each one-way gas flow dry run, the half period utilizes bed cereal in bottom in heated-air drying hothouse, and the later half cycle reduces Incoming gas temperature, and utilizes the amount of stored heat dry rear portion bed cereal of bottom bed cereal.Compared with thin layer grain dry, in this dry run, heat is used for thick-layer grain dry, can reduce the temperature of emission gases to greatest extent, realize energy-conservation effect.But the cooling of later half cycle hothouse bottom bed cereal must meet simultaneously:
(1) wind-warm syndrome becomes after T tempering from T hot blast, and original place to lower the temperature thermal requirement needed for hydrofuge that the heat that provides must meet the top bed cereal being in T normal temperature in the bottom cereal bed of T hot blast;
(2) wind-warm syndrome becomes after T tempering from T hot blast, and heating-up temperature and speed must meet the temperature and time requirement of hothouse bottom bed cereal tempering process.
Operation phase (in Fig. 3 t7 to t9 moment), this stage is the flow process of each arid cycle after system enters normal operating phase.
Step D, after the superiors' cereal-granules reaches T hot blast in hothouse, as the t6 moment in Fig. 3, change airflow direction and gas flow temperature maintains 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, when 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 realize the alternation alternating temperature dry run of cereal.
In dry run, introduce vibration, by controlling vibration condition and the flow conditions of granular system, realizing the DYNAMIC DISTRIBUTION and the convective motion that control particle, improve uniform drying or improve thickness of feed layer further.
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.
Build the thick-layer grain dry experimental bench of a set of coupling alternating temperature alternation air-flow and vibration, comprise hothouse, airflow-reversing device, air-supply arrangement, heater, vibrating device, waste-heat recovery device etc.Wheat is put into, material bed thickness 15cm in hothouse.
First open vibrating device, amplitude and vibration frequency are separately fixed at 1mm and 30Hz.
Open blower fan and electric heater, gas flow temperature is adjusted to 60 DEG C, air velocity is adjusted to 1m/s simultaneously;
When hothouse middle portion temperature measuring point reaches 59.8 DEG C, changing gas flow temperature is 40 DEG C;
Change airflow direction when reaching 59.8 DEG C along the hothouse distalmost end temperature in this dry gas stream direction, and gas flow temperature is adjusted to 60 DEG C;
Changing gas flow temperature when hothouse middle portion temperature measuring point reaches 59.8 DEG C is again 40 DEG C;
When reaching 59.8 DEG C along the hothouse distalmost end temperature in this dry gas stream direction, again changing airflow direction, and gas flow temperature is adjusted to 60 DEG C;
Continuous repetition said process, until the water capacity of wheat lower than 13% time experiment terminate.
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, under the prerequisite not departing from 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 (6)
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| JPH01219491A (en) * | 1988-02-26 | 1989-09-01 | Iseki & Co Ltd | Control system for cereals grain drier |
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