CN106980332A - A kind of detection method of grain storage state - Google Patents
A kind of detection method of grain storage state Download PDFInfo
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- CN106980332A CN106980332A CN201710368859.1A CN201710368859A CN106980332A CN 106980332 A CN106980332 A CN 106980332A CN 201710368859 A CN201710368859 A CN 201710368859A CN 106980332 A CN106980332 A CN 106980332A
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
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Abstract
The invention discloses a kind of detection method of grain storage state, comprise the following steps：(1) the grain electric capacity in pre-set space is determined；Temperature sensor is placed at the center of pre-set space, passes through the temperature of temperature sensor measurement temperature sensor in itself；(2) under original state, the grain moisture content in pre-set space is normal, and the grain grain internal and external temperature of the grain in pre-set space is consistent, and the grain in pre-set space reaches thermal balance with temperature sensor；When the temperature change that compared to original state, temperature sensor is measured less, and the grain electric capacity in the pre-set space measured judges that the grain in pre-set space produces fever phenomenon when substantially increasing；When the temperature change that compared to original state, temperature sensor is measured less, and the grain electric capacity in the pre-set space measured judges that the grain in pre-set space produces dew condensation phenomenon when dramatically increasing.The present invention, which can be analyzed rapidly and accurately, judges whether grain grain internal and external temperature is consistent, whether grain generates heat, whether condenses.
Description
Technical field
The present invention relates to grain storage field, a kind of detection method of grain storage state is related in particular to.
Background technology
China is a populous nation and grain-production big country, and grain security involves the interests of the state and the people.China's grain storage rule
Mould is big and storage time is long, determines the importance of grain storage quality.Grain storage state is specifically divided into cereal temperature, grain water
Divide, whether grain generates heat (i.e. grain temperature abnormality is high, the rotten feature of grain).When grain moisture content exceedes the corresponding safe moisture of grain temperature
When, grain may generate heat.Safe moisture under different temperatures is different, and universal law is grain Wen Yuegao, and safe moisture is lower.
Current China's grain storage industry has been popularized grain temperature and monitored on-line, and some include the cable of multiple temperature sensors and are with several meters
In interval insertion grain, the grain temperature detector survey grid network of multilayer multiple spot is formed.
The grain of longer-term storage (1-3) or safe production in summer balances phase under the conditions of actual controllable highest grain temperature with grain heap
It is reference index of the moisture corresponding to 65% as determination grain security moisture to humidity.Table 1 is provided by taking paddy as an example
Equilibrium water conten (selecting from, Wang Ruolan, grain and oil storage is learned, China Light Industry Press) under different humitures.Under normal circumstances, grain
Storehouse is in the winter time to grain storage ventilation to reduce grain temperature, closed silo after beginning of spring temperature of waiting for the coming year gets warm again after a cold spell, until next autumn and winter.
During this, grain is in cryopreservation environment, and its moisture and temperature are relatively sufficiently stable.But the factor such as gas leakage can make grain between Ao
Temperature is gradually increasing, and extra ventilation is needed if grain temperature is too high, to reduce grain temperature and suitably reduce moisture.Grain temperature is lower, safe water
Divide higher, economic value is higher.In addition, the infested key character gone mouldy of grain is that grain temperature rises, therefore the survey of grain temperature detector is
The main perception means of current grain information monitoring.
Paddy equilibrium water conten under the different humitures of table 1
The cable for measuring temperature installed in current grain storage Standard Ao is substantially the encapsulation temperature sensor in cable.
Cable for measuring temperature is inserted perpendicularly into grain, through grain bottom surface and surface.Each grain layer is detected positioned at the temperature sensor of different height
Temperature.
Temperature sensor has many kinds, as the contact temperature-measuring method that grain depot is used, and temperature sensor can be with circuit
It is that a resistor (thermistor), two kinds of metals weld together (thermocouple) etc..The temperature of sensor itself can change
Electrical potential difference between the resistance of resistor, two kinds of metals, change by detecting electrical parameter is counter to release temperature value.
It should be noted that the operation principle of temperature sensor determines that measured temperature is substantially the temperature of sensor itself.
Thermal balance only is reached in temperature sensor and environment, temperature reading is only ambient temperature value.Therefore only grain is passed with temperature
Sensor reaches after thermal balance that measured temperature is only cereal temperature.The temperature of only grain heating is diffused into temperature sensor
Position, it can just perceive grain overheat, and grain is the non-conductor of heat, have which results in cable for measuring temperature detection grain overheat
Certain hysteresis quality.
The content of the invention
The technical problems to be solved by the invention, which are to provide one kind and can rapidly and accurately analyze judgement, puts out cereal the outer temperature of intragranular
The detection method for the grain storage state whether whether degree is consistent, whether grain generates heat, condense.
In order to solve the above-mentioned technical problem, the present invention is adopted the following technical scheme that：A kind of detection method of grain storage state, bag
Include following steps：
(1) detection process
Determine the grain electric capacity in pre-set space；Temperature sensor is placed at the center of pre-set space, passes through TEMP
Device determines the temperature of temperature sensor in itself；
(2) deterministic process
Under original state, the grain moisture content in pre-set space is normal, the grain grain internal and external temperature one of the grain in pre-set space
Cause, the grain in pre-set space reaches thermal balance with temperature sensor；
When compared to original state, the temperature that temperature sensor is measured does not have significant change, and in the pre-set space measured
When grain electric capacity increases extremely, the internal and external temperature of the grain in judgement pre-set space is inconsistent；
When the temperature change that compared to original state, temperature sensor is measured less, and the grain in the pre-set space measured
When electric capacity substantially increases, judge that the grain in pre-set space produces fever phenomenon；
When the temperature change that compared to original state, temperature sensor is measured less, and the grain in the pre-set space measured
When electric capacity is dramatically increased, judge that the grain in pre-set space produces dew condensation phenomenon.
Further, pre-set space center place capacitance-type sensor for moisture content, by capacitance-type sensor for moisture content come
Determine the grain electric capacity in pre-set space, and the abnormal increase of the grain moisture content measured with capacitance-type sensor for moisture content, substantially increasing
Plus, dramatically increase and increase, substantially increase, dramatically increase to characterize the exception of grain electric capacity.
Further, capacitance-type sensor for moisture content is integrated with temperature sensor.
Further, if grain moisture content normal value is X, grain moisture content increases to (1.07~1.18) X and increased to be abnormal, grain
It is obvious increase that drinking water point, which increases to (1.19-1.38) X, and grain moisture content increases to more than 2.5X to dramatically increase.
Further, grain is paddy rice, and paddy rice moisture normal value is 14%, and it is abnormal increasing that paddy rice moisture, which increases to 15%,
Plus, it is substantially increase that paddy rice moisture, which increases to 17%, and paddy rice moisture increases to more than 40% to dramatically increase.
Further, grain is wheat, and wheat water content normal value is 12.5%, and it is exception that wheat water content, which increases to 13.5%,
Increase, it is substantially increase that wheat water content, which increases to 15%, and wheat water content increases to more than 40% to dramatically increase.
Further, grain is corn, and corn moisture normal value is 13%, and it is abnormal increasing that corn moisture, which increases to 15%,
Plus, it is substantially increase that corn moisture, which increases to 18%, and corn moisture increases to more than 40% to dramatically increase.
Beneficial effects of the present invention are：
The present invention is increased using grain dielectric constant as grain moisture content increases, and grain dielectric constant is with cereal temperature
The property for increasing and increasing, if grain grain internal and external temperature is inconsistent, moisture calculated value differs greatly when suitable with grain grain internal and external temperature,
Thus judge whether grain grain internal and external temperature is consistent；
The present invention is more than temperature sensor temperature sensing space using electric capacity space exploration, and moisture diffusion speed is more than temperature
Conduction of velocity, the grain dielectric constant property related to cereal temperature, if cereal temperature is than temperature sensor in pre-set space
Measured value is high, then the grain electric capacity measured can be higher, and the grain moisture content thus calculated is bright by the measured value before being overheated than grain
Aobvious to increase, more than the normal range (NR) of grain storage moisture, thus judging grain, whether moisture is too high, and whether grain generates heat；
The present invention using water dielectric constant high grain an order of magnitude the characteristics of, if grain surface has dew, survey
The grain electric capacity and grain moisture content calculating value obtained will significantly be higher by normal range (NR), thus judge whether grain condenses.
The present invention can rapidly and accurately detect electric capacity (moisture) change of grain and the electric capacity (water by measuring
Point) value, temperature value analysis judgement is put out cereal, and whether whether whether consistent, grain generate heat, condense the outer temperature of intragranular, so as to allow storage
Grain is safer, more high-quality.
The present invention can also judge grain is carrying out which kind of ventilating, the expected effect reached of ventilation.In conjunction with grain depot
Intelligent ventilating system ventilating can be made more efficient, more accurate so that realize energy-saving and emission-reduction, it is environment friendly and pollution-free.
Brief description of the drawings
Fig. 1 is the arrangement schematic diagram of silo inner sensor.
Fig. 2 is the relation and variation diagram of electric capacity, temperature and the moisture of embodiment 1.
Fig. 3 is the relation and variation diagram of electric capacity, temperature and the moisture of embodiment 2.
Fig. 4 is the relation and variation diagram of electric capacity, temperature and the moisture of embodiment 3.
In accompanying drawing the mark of each part for：Between 1 Ao, 2 cables, 21 measurement points, 3 data read modules.
Embodiment
The present invention is described in detail below in conjunction with embodiment.
The detection method of grain storage state of the present invention, comprises the following steps：
(1) detection process
Determine the grain electric capacity in pre-set space；Temperature sensor is placed at the center of pre-set space, passes through TEMP
Device determines the temperature of temperature sensor in itself；
(2) deterministic process
Under original state, the grain moisture content in pre-set space is normal, the grain grain internal and external temperature one of the grain in pre-set space
Cause, the grain in pre-set space reaches thermal balance with temperature sensor；
When compared to original state, the temperature that temperature sensor is measured does not have significant change, and in the pre-set space measured
When grain electric capacity increases extremely, the internal and external temperature of the grain in judgement pre-set space is inconsistent；
When the temperature change that compared to original state, temperature sensor is measured less, and the grain in the pre-set space measured
When electric capacity substantially increases, judge that the grain in pre-set space produces fever phenomenon；
When the temperature change that compared to original state, temperature sensor is measured less, and the grain in the pre-set space measured
When electric capacity is dramatically increased, judge that the grain in pre-set space produces dew condensation phenomenon.
Embodiment 1 is provided below, is described in detail by taking paddy rice as an example, the moisture value of normal warehouse paddy rice is in silo
14%, when moisture value is more than 17%, paddy rice can then generate heat, or even go mouldy.
Embodiment 1
The present embodiment places capacitance-type sensor for moisture content at the center of pre-set space, is surveyed by capacitance-type sensor for moisture content
Determine the grain electric capacity in pre-set space, and the abnormal increase of the grain moisture content measured with capacitance-type sensor for moisture content, substantially increase,
Dramatically increasing increases, substantially increases, dramatically increases to characterize the exception of grain electric capacity.So, easy reading and judgement.
Capacitance-type sensor for moisture content is substantially a capacitor, certain space around its electric field line covering sensor (
That is pre-set space), the grain electric capacity surveyed in pre-set space except with grain moisture content into monotropic function in addition to, also by grain dielectric constant
Influence, therefore grain electric capacity in surveyed pre-set space can also characterize the grain dielectric constant in the pre-set space.Referring to figure
2, grain moisture content is constant, and grain dielectric constant increases with the increase of grain temperature；Grain temperature is constant, and grain dielectric constant is with grain
The increase of moisture and increase.The computational methods of grain moisture content are that temperature and electric capacity are input quantity, and grain moisture content is output quantity.
It is determined that at a temperature of, grain dielectric constant can be considered constant, and the change of dielectric constant caused by temperature change can be mended by temperature
Method is repaid to correct.
The moisture distribution in grain in surveyed pre-set space in grain grain outwardly and inwardly.The moisture master of low moisture grain
It is distributed in grain intragranular portion.The hydrone in grain intragranular portion is fettered by other molecules around starch etc., free limited in rotation, even
Polar moment is smaller.As grain moisture content is raised, grain moisture content gradually expands to outside from grain intragranular portion.Outside moisture is with multilayer molecular
The form of film is present, and with the increase of moisture, the number of plies of molecular film gradually increases.The constraint that outside is subject to is fewer than inside, therefore
Dipole moment is bigger, and the dipole moment of the high-rise molecule of multilayer film is bigger than bottom, to the contribution of grain dielectric constant than grain intragranular portion
Moisture is big.It follows that as grain moisture content increases, grain dielectric constant (or grain electric capacity) is increased monotonically, and slope is in increasing
Plus trend.
There is balance, when local grain moisture content is too high, water in grain moisture content and grain heap between relative air humidity
Molecule can be diffused into air, and then is diffused into the grain on periphery, alternately, and range of scatter gradually expands.
Referring to Fig. 1, by taking (60 meters × 24 meters) 1 between standard silo Ao as an example, arrangement (6 × 13) surveys formula cable for totally 78 in it
2, cable is inserted perpendicularly into grain, through grain bottom surface and surface, and every cable has four measurement points 21, and each measurement point installs electricity
Appearance formula moisture transducer and temperature sensor, capacitance-type sensor for moisture content can be integrated with temperature sensor, convenient peace
Dress, the electric field line coverage of capacitance-type sensor for moisture content is that, using sensor as the centre of sphere, radius 25cm spheroid, cable top is set
There is data read module 3, facilitate reading.
Essence of the invention is to detect that object is inconsistent and detects grain storage using capacitance-type sensor for moisture content and temperature sensor
State.Capacitance-type sensor for moisture content measurement is the grain electric capacity in its electric field line covering space and the grain electric capacity by measuring
Calculate grain moisture content, temperature sensor measurement detection is the temperature of temperature sensor in itself, namely with outside temperature sensor
The grain surface temperature of surface contact.
The present invention is increased using grain dielectric constant as grain moisture content increases, and grain dielectric constant is with cereal temperature
The property for increasing and increasing, if grain grain internal and external temperature is inconsistent, difference when grain moisture content calculating value is suitable with grain grain internal and external temperature
It is larger, thus judge whether grain grain internal and external temperature is consistent；
The present invention is more than temperature sensor temperature sensing space, water using capacitance-type sensor for moisture content electric field line covering space
Diffusion velocity is divided to be more than temperature conduction speed, the grain dielectric constant property related to cereal temperature, if condenser type moisture is sensed
Cereal temperature is higher than the measured value of temperature sensor in device electric field line covering space, then the grain that capacitance-type sensor for moisture content is detected
Eating electric capacity can be higher, and the moisture value thus calculated significantly improves the measured value before being overheated than grain temperature, more than grain storage moisture
Normal range (NR), thus judging grain, whether moisture is too high, and whether grain generates heat；
The present invention using water dielectric constant high grain an order of magnitude the characteristics of, if there is dew in grain surface, electricity
The grain electric capacity and grain moisture content calculating value of appearance formula moisture transducer measurement will substantially be higher by normal range (NR), thus judge grain
Whether condense.
Referring specifically to Fig. 2, it is assumed that under original state, the grain moisture content in pre-set space is normal, the grain in pre-set space
Grain grain internal and external temperature it is consistent, the grain in pre-set space reaches thermal balance with temperature sensor, is set to a point (moisture values
14%)；
If the grain grain internal and external temperature of the grain in pre-set space is inconsistent, (i.e. grain produces heat by respiration, leads
Cause the grain intragranular portion temperature drift of grain), now grain intragranular portion temperature drift, grain dielectric constant also can be higher, but in high temperature
It is delivered to before temperature sensor, temperature sensor temperature does not have significant change (change is within 0.3 DEG C), but the default sky
Interior grain electric capacity increases because of temperature rising in grain, causes measuring grain moisture content value abnormal can increase and (is changed into b1 points, water
Score value 15%)；
If grain in pre-set space causes heating because moisture is too high, or even goes mouldy, infested, temperature is delivered in high temperature
Before sensor, temperature sensor measurement temperature change less (change is within 1 DEG C), but the grain electric capacity in the pre-set space
Because cereal temperature rises and increases, measuring grain moisture content value is caused substantially to increase and (be changed into b2 points, moisture value 17%)；
If the grain moisture condensation in pre-set space, because the dielectric constant of water is 25 DEG C of 80@, and grain is between 2-7, water
The high grain an order of magnitude of dielectric constant, before grain heating, less (change is at 1 DEG C for temperature sensor measurement temperature change
Within), the grain electric capacity in the pre-set space can dramatically increase and (be changed into b points, moisture value more than 40%), it is possible thereby to send out in advance
Existing problem.
Conclusion：According to the method, when moisture value is become by a points turns to b1 points (abnormal to increase), condenser type water can be detected
Whether the grain grain internal and external temperature of grain is consistent in sub-sensor electric field line covering space；When moisture value is become by a points, to turn to b2 points (bright
Aobvious increase) when, it can detect whether grain moisture content is higher in capacitance-type sensor for moisture content electric field line covering space, and whether grain is sent out
Heat, so go mouldy, infested；When moisture value is become by a points turns to b points (dramatically increasing), capacitance-type sensor for moisture content can be detected
Whether the grain in electric field line covering space condenses.
Inventor passes through follow-up study, draws：If grain moisture content normal value be X, grain moisture content increase to (1.07~
1.18) X increases to be abnormal, and it is obvious increase that grain moisture content, which increases to (1.19-1.38) X, and grain moisture content increases to more than 2.5X
To dramatically increase.
Specifically, for wheat, wheat water content normal value is 12.5%, and it is abnormal increasing that wheat water content, which increases to 13.5%,
Plus, it is substantially increase that wheat water content, which increases to 15%, and wheat water content increases to more than 40% to dramatically increase；It is beautiful for corn
Meter Shui Fen normal values are 13%, and it is abnormal increase that corn moisture, which increases to 15%, and it is substantially increase that corn moisture, which increases to 18%,
Corn moisture increases to more than 40% to dramatically increase.
During food storage, also frequently there is ventilating to adjust the environment temperature and grain moisture content of grain.It is logical
The economic indicator that wind operation is considered has two：One is energy consumption, that is, the expenditure such as spent electricity charge of divulging information；Two be moisture loss, i.e.,
The grain moisture content that ventilation is taken away.
The low-moisture principle of ventilation drop is, when air humidity is medium or relatively low, and air-flow passes through grain, promotes grain grain surface
Vapor volatilization.If increasing air humidity, it can be seen from table 1, the vapor in air can be progressed into grain, increase grain
Drinking water point, this ventilation is called conditioning and aeration.But conditioning and aeration is likely to result in grain grain surface sweating, triggers infested go mouldy.Condensation
Deng aqueous water dielectric constant (78 25 DEG C of@) compared with grain (2-7) poor an order of magnitude, there is obvious differentiation in capacitance.Increase
Need whether monitoring air inlet condenses during the conditioning and aeration added water point.When condensing, relatively dry air is passed through in time, is kept away
Exempt from grain heating.
Temperature sensor heat transfer is faster than grain, therefore in ventilation process, temperature reading declines must be than grain internal temperature
It hurry up, the former first reaches the temperature of air.As described above, grain dielectric constant is related to grain internal temperature, before ventilation
Grain moisture content difference may determine that whether grain grain internal temperature drops to requirement temperature afterwards (industry is referred to as " cold core "), it is to avoid excessively
Ventilation, reduces energy consumption.
Below by taking paddy rice as an example, then introduce capacitance-type sensor for moisture content and temperature sensor during two kinds of ventilatings
Measurement variation.
Embodiment 2
Reduce the force ventilation of grain temperature
As shown in figure 3, being a points (moisture value is 14%) before ventilation, after divulging information after a while, grain grain is outside have been cooled down
But internal temperature does not lower completely, being just changed into c points, (i.e. grain grain internal temperature is than grain grain external temperature and temperature sensor temperature
Degree declines slowly, therefore internal dielectric constant declines slowly.But moisture measurement value is according to sensor temperature and internal dielectric constant
Calculate, so moisture measurement value can increase, sensor temperature declines；15.5%) moisture value is；Treat that grain grain internal temperature is fallen
After coming, grain intragranular is outer and temperature sensor reaches thermal balance again, and c points can eventually become d points (moisture value is 13.5%), i.e. grain
Drinking water point is because ventilation produces partial loss.
Conclusion：According to the method, it can reflect to quicklook grain in cooling ventilation process, temperature sensor measurement
Variation of ambient temperature is very fast, but the grain intragranular portion temperature change of grain is slower, and when internal and external temperature is balanced, grain moisture content can slightly have
Reduction.
Embodiment 3
The conditioning and aeration moisturized
As shown in figure 4, when ventilation just starts, moisture concentrates on grain grain surface and outside, capacitance-type sensor for moisture content electric capacity
Increase, treats that moisture diffusion is arrived after grain intragranular portion, and grain intragranular portion's dielectric constant is outside smaller than grain grain, capacitance-type sensor for moisture content survey
The electric capacity obtained can be gradually reduced.Moisture measurement value first can substantially increase from initial value a points (moisture value is 13%) in this process
Add to e points (moisture value is 16%), after taper into and level off to the moisture actual value f points after adding water (moisture value is
14.5%).
Conclusion：According to the method, it can reflect to quicklook grain during conditioning and aeration, capacitance-type sensor for moisture content
The moisture value of measurement is because grain surface is born water and is substantially increased, and the change of grain internal moisture is slower, treats that free surface moisture is put down in grain
During weighing apparatus, capacitance-type sensor for moisture content measurement moisture value falls after rise and close to actual value.
It should be understood that example as described herein and embodiment are not intended to limit the invention, this area only for explanation
Technical staff can make various modifications or change according to it, within the spirit and principles of the invention, any modification for being made,
Equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (7)
1. a kind of detection method of grain storage state, it is characterised in that comprise the following steps：
(1) detection process
Determine the grain electric capacity in pre-set space；Temperature sensor is placed at the center of pre-set space, is surveyed by temperature sensor
Determine the temperature of temperature sensor in itself；
(2) deterministic process
Under original state, the grain moisture content in pre-set space is normal, and the grain grain internal and external temperature of the grain in pre-set space is consistent, in advance
If the grain in space reaches thermal balance with temperature sensor；
When compared to original state, the temperature that temperature sensor is measured does not have a significant change, and the grain in the pre-set space measured
When electric capacity increases extremely, the internal and external temperature of the grain in judgement pre-set space is inconsistent；
When the temperature change that compared to original state, temperature sensor is measured less, and the grain electric capacity in the pre-set space measured
Substantially during increase, judge that the grain in pre-set space produces fever phenomenon；
When the temperature change that compared to original state, temperature sensor is measured less, and the grain electric capacity in the pre-set space measured
When dramatically increasing, judge that the grain in pre-set space produces dew condensation phenomenon.
2. the detection method of grain storage state as claimed in claim 1, it is characterised in that place electric capacity at the center of pre-set space
Formula moisture transducer, the grain electric capacity in pre-set space is determined by capacitance-type sensor for moisture content, and pass with condenser type moisture
Abnormal increase, substantially increasing that the exception for the grain moisture content that sensor is measured increases, substantially increased, dramatically increasing to characterize grain electric capacity
Plus, dramatically increase.
3. the detection method of grain storage state as claimed in claim 2, it is characterised in that capacitance-type sensor for moisture content is passed with temperature
Sensor is integrated.
4. the detection method of grain storage state as claimed in claim 2, it is characterised in that set grain moisture content normal value as X, grain
Moisture increases to (1.07~1.18) X and increased to be abnormal, and it is obvious increase, grain water that grain moisture content, which increases to (1.19-1.38) X,
Dividing increases to more than 2.5X to dramatically increase.
5. the detection method of grain storage state as claimed in claim 2, it is characterised in that grain is paddy rice, paddy rice moisture is normal
It is worth for 14%, it is abnormal increase that paddy rice moisture, which increases to 15%, and it is substantially increase that paddy rice moisture, which increases to 17%, and paddy rice moisture increases
More than 40% is added to dramatically increase.
6. the detection method of grain storage state as claimed in claim 2, it is characterised in that grain is wheat, wheat water content is normal
It is worth for 12.5%, it is abnormal increase that wheat water content, which increases to 13.5%, and it is substantially increase, wheat water that wheat water content, which increases to 15%,
Dividing increases to more than 40% to dramatically increase.
7. the detection method of grain storage state as claimed in claim 2, it is characterised in that grain is corn, corn moisture is normal
It is worth for 13%, it is abnormal increase that corn moisture, which increases to 15%, and it is substantially increase that corn moisture, which increases to 18%, and corn moisture increases
More than 40% is added to dramatically increase.
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| CN110286144B (en) * | 2019-07-12 | 2020-07-21 | 吉林大学 | Grain heap condensation prediction method |
| CN114373289A (en) * | 2021-12-08 | 2022-04-19 | 航天信息股份有限公司 | Early warning and alarming system and method for grain condition |
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