CN103323571A - Method for positioning activities of Entomophthora in grain piles of grains stored in grain bin - Google Patents
Method for positioning activities of Entomophthora in grain piles of grains stored in grain bin Download PDFInfo
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- CN103323571A CN103323571A CN2013102972164A CN201310297216A CN103323571A CN 103323571 A CN103323571 A CN 103323571A CN 2013102972164 A CN2013102972164 A CN 2013102972164A CN 201310297216 A CN201310297216 A CN 201310297216A CN 103323571 A CN103323571 A CN 103323571A
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Abstract
The invention discloses a method for positioning activities of Entomophthora in grain piles of grains stored in a grain bin. According to characteristics of grain piles, monitoring layers are respectively selected and set in the vertical direction of the grain piles; carbon dioxide gas concentration monitoring points are arranged at certain interval on each monitoring layer; and through periodically detecting changes of the carbon dioxide gas concentration of each monitoring point and according to distribution of grain pile carbon dioxide gas concentration, key points and relative points of activities of Entomophthora in the grain piles are determined and activity spaces and parts of Entomophthora in the grain piles are positioned.
Description
Technical field
The invention belongs to the technical field of foodstuff preservation safety monitoring, specifically, relate to a kind of by measuring the gas concentration lwevel of silo China Oil and Food Import and Export Corporation heap privileged site, diffusion property according to carbon dioxide in the grain heap, grow in the grain heap, the movable position of entomophthora of metabolism positions, for the accurate harm of prevention and control grain storage entomophthora provides foundation.
Background technology
The grain reserves scale of China is large, and storage time is long, and storage period generation entomophthora harm activity is the phenomenon that is difficult to avoid.The usual earlier of entomophthora growth occurs in a certain zone of grain heap, then constantly to around expansion, finally cause the serious loss of grain storage, such as the bad change that causes grain apparent quality, edible quality and processing technology quality etc.Some mould that especially can in grain, grow, behind the growth certain hour, can also metabolism produce various poisonous secondary metabolites, the mycotoxins such as aflatoxin that have strong toxicity and carcinogenicity such as generation can cause to the health of humans and animals serious harm.Therefore, only have accurately, in time find the position of entomophthora early ambulant in the grain heap, targetedly early time treatment control, the safety of guarantee foodstuff preservation are carried out in the entomophthora activity that grain storage occurs.
At present, the foodstuff preservation industry generally adopts the method for temperature detection to the location of grain storage entomophthora harm activity, but because the conduction of velocity of temperature in the grain heap is slow, must relies on very dense to set up an office and could obtain the information of entomophthora activity, each silo need to arrange hundreds of monitoring points usually.Even so, the sensitivity of its monitoring is still undesirable, and when finding that some regional cereal temperature raises unusually, the entomophthora growth phenomenon that sense organ can be distinguished has appearred in grain that often should the zone.
The entomophthora activity can produce carbon dioxide in the grain, and carbon dioxide has preferably diffusivity in the grain heap simultaneously, changes by the gas concentration lwevel that detects the grain heap, can reach the purpose of entomophthora activity in the monitoring grain storage.Existing grain heap carbon dioxide detection method mainly contains two classes, and a class belongs to the pocket detector, by the operating personnel scene gas sample tube is inserted the grain heap, grain heap surface is carried out gas detect.This detection method is subjected to the manually restriction of insertion gas sample tube in the grain heap, generally only has about 0.5 meter, is difficult to obtain the entomophthora action message of whole silo.Another kind of is the gas pipe line at pre-buried different depth and position in grain heap, carbon dioxide in the grain heap is detected, but existing method is not set up an office targetedly in conjunction with the diffusion property of carbon dioxide in the grain heap, do not set up according to each monitoring point gas concentration lwevel yet and change the analytical approach that the movable position of entomophthora is positioned, general setting up an office of spacing can't be determined the accurate zone of entomophthora activity, the workload of intensive material consumption of setting up an office and monitoring is all excessive, is difficult to carry out in the grain storage practice.
Summary of the invention
Purpose of the present invention provides the method for entomophthora activity orientation in a kind of grain heap of silo foodstuff preservation just for existing weak point in the above-mentioned prior art.Method of the present invention is carried out the optimization setting of monitoring point according to the diffusion property of carbon dioxide in the grain heap, purpose is by minimum monitoring point being set and dropping into minimum monitoring amount, before entomophthora does not cause obvious destruction to grain storage and quality thereof, accurately find the movable position of entomophthora in the grain heap, prevent the grain storage loss that the entomophthora activity causes.
Purpose of the present invention can realize by following technique measures:
The method of entomophthora activity orientation is at grain heap privileged site the density of carbon dioxide gas monitoring point to be set in the grain heap of silo foodstuff preservation of the present invention, the density of carbon dioxide gas that regularly detects each monitoring point changes, pile the distribution of density of carbon dioxide gas according to grain, the position of entomophthora activity positioned during grain was piled.
The concrete measure of the inventive method is as follows:
A, the density of carbon dioxide gas monitoring point is set in grain heap: the grain bin bottom monitor layer that at first at position beyond wall 1 m-4 m, in the bottom section of silo terrace 0 m-1 m, is consisted of by several density of carbon dioxide gas monitoring points with the row, column spacing setting of 4 m-8 m, arrange with the spacing every 2 m-3 m in the grain bulk height direction afterwards that each monitoring point quantity of one deck and grain bin bottom monitor layer equates, the corresponding monitor layer in position, and the top layer monitor layer apart from grain heap surface distance more than or equal to 3 m;
B, the detection of carrying out grain heap density of carbon dioxide gas and the arrangement of detected value: the density of carbon dioxide gas that carries out each monitoring point take 5 d-10 d as the cycle detects, each detected value of each monitoring point and a front detected value are compared, select detected value greater than 1%, and this detected value is put the position of a front detected value large 0.2% than this, or the concentration increment size that detects of twice carbon dioxide in same monitoring point greater than 0.5% position as the locator key point; Relatively same layer is put the density of carbon dioxide gas of adjacent monitoring point with each locator key, selects respectively a more front detected value and increases and surpass 0.1% position as locating reference point; If it is adjacent to reach the position of locator key point index, determine that the larger position of detected value or gas concentration lwevel increment size is the locator key point, all the other are the location reference point;
C,, to the space orientation of entomophthora moving point: on the grain face centered by each locator key point, draw and the line of locating reference point, take each monitoring point density of carbon dioxide gas detected value as weight, according to the method for Calculating Torque during Rotary, the center of gravity position of each bar line of calculative determination; If it is adjacent that locator key point is not located reference point, locator key is selected and is the projection of entomophthora activity centre on the grain face; If the locator key point only has an adjacent positioned reference point to connect a line, then focus point namely is that the projection position on grain heap surface is selected in the entomophthora activity centre; If the locator key point has two lines of two location adjacent connections of reference point, then connect two focus points and make a new line, the weight calculation that recycles two the location reference point detected values center of gravity position of line that makes new advances is for select at the surperficial projection position of grain heap the entomophthora activity centre; 2 location reference points are adjacent to connect into many lines if locator key point surpasses, then line is made at adjacent center of gravity position, can form a zone at the grain face, this regional geometric center is in the grain heap the movable position of entomophthora correspondence at the projection position on grain heap surface; The area of space of entomophthora activity be arranged in the cylindricality zone of 3 meters of corresponding, tops, reference point plane of living in, location, the projection position of determining.
Beneficial effect of the present invention is as follows:
(1) the present invention has carried out the optimization of monitoring point according to the needs of entomophthora activity orientation in the grain heap, under can the prerequisite to entomophthora zone of action effective location in the grain heap, reduce as far as possible the setting of monitoring point, not only can significantly save the expense of the materials such as gas pipe line, and can reduce the human and material resources consumption that silo is layouted and density of carbon dioxide gas detects, the more important thing is accuracy and the reliability that can also improve detection.Because the inventive method is to detect by the gas that extracts in the grain heap, the gas that need to bleed first during each the detection and retain in the regular hour displacement pipeline, the inevitable gas by other source of the gas that is extracted in the grain heap replenishes, intensive layout bleed detection can affect this monitoring aspect gas componant, reduce sensitivity and the reliability of monitoring.
(2) the movable commitment of entomophthora in the grain heap is generally from a certain zonule, it is breathed the carbon dioxide that produces and also spreads gradually from growth site, except carbon dioxide proportion a little more than air, have outside the faint sinking tendency, diffusion in other direction does not have notable difference, therefore, utilize the poor accurate location that can carry out the movable position of entomophthora of density of carbon dioxide gas in the grain heap.According to the biological characteristics of entomophthora growth with to the density of infection of initial stage of growth to grain storage, interval detection time of 5 d-10 d can not affect the monitoring effect to stored grain safety.In order to locate accurately, regioselective key point and reference point are very important, regulation of the present invention compares each monitoring point detected value and a front detected value, select detected value greater than 1%, and this detected value is put the position of a front detected value large 0.2% than this, or the concentration increment size that detects of twice carbon dioxide in same monitoring point greater than 0.5% position as the locator key point.Because increasing of gas concentration lwevel is the sign of activity of entomophthora, can effectively get rid of the carbon dioxide background concentration variation that grain self is breathed.If it is many to meet the monitoring point of locator key point index, show that entomophthora occurs at multiple location, appear at the contiguous position that links to each other if meet the monitoring point of locator key point index, show that then the entomophthora Comparison of Gardening Activities seriously or expands to larger zone.The probability that the regional less that relates in the starting stage of entomophthora activity, monitoring point just in time are positioned at locator key point is very low, also needs to utilize the diffusion property of carbon dioxide in the grain heap that the Different Effects of periphery monitoring point, zone of action is carried out multipoint positioning.One-time detection increased and surpasses 0.1% position as the location reference point before the present invention adopted key point is adjacent and concentration detected value, movable and this distance less than this concentration change amplitude explanation entomophthora, gas concentration lwevel value to this point does not exert an influence, and does not consider its weight during the location yet.
(3) although by the analysis to the density of carbon dioxide gas detected value of each monitoring point, can show that the entomophthora activity is in the zone which monitoring point forms in the grain heap, but because less in the zone of entomophthora early ambulant, with respect to larger monitoring point apart from the interval, still can't determine accurately volume coordinate, press down mould method with the local desinsection of the general inserting tube dispenser of grain storage or single tube blower fan local dewatering and be difficult to the treatment effect that reaches desirable, even may the diffusion in pest activity zone or the water transport phenomenon of original high-moisture grain appear because treatment sites departs from far away, cause occurring more hidden danger.Therefore, improve the implementation result that the accuracy of entomophthora hazard area location is directly affected grain storage technique.The present invention is according to the research to the diffusion of grain heap carbon dioxide, find that gas has consistance aspect the transverse dispersion of grain heap, the monitoring point at a distance of the distance of entomophthora moving point with record the gas concentration lwevel relation of being inversely proportional to, so with the concentration value that detects as weight, adopt the method for Calculating Torque during Rotary, can be easily in the definite center of gravity of ruling and finding each bar line of grain face, determine further that again the entomophthora activity centre is at the projection position of grain face, the projection position of finding out the entomophthora activity just can be on the grain face be carried out accurately desinsection or is controlled mycostatic processing to position, space, place, realize the early stage accurately prevention and control to the activity of grain storage entomophthora.
Description of drawings
Fig. 1: 32 m * 24 m * 6 m(length * wide * height) (the monitoring point degree of depth is 3 m and 6 m for one of (32 m * 24 m * 6 m(length * wide * height) the silo monitoring point setting of one of the setting of silo monitoring point and detection data and detection data, the data top is adjacent 2 detected values in 3 m monitoring points among the figure, and the below is adjacent 2 detected values in 6 m monitoring points; Data unit is among the figure: %).
Fig. 2: locator key is selected, the silo entomophthora moving point grain face location map of two location reference points.
Fig. 3: 32 m * 24 m * 6 m(length * wide * height) the silo monitoring point arrange and detect data two (the monitoring point degree of depth is 3 m and 6 m, and the data top is adjacent 2 detected values in 3 m monitoring points among the figure, and the below is adjacent 2 detected values in 6 m monitoring points; Data unit is among the figure: %).
Fig. 4: locator key is selected, three location reference point silo entomophthora moving point grain face location map.
Embodiment
The present invention is further described below with reference to embodiment (accompanying drawing):
Embodiment 1: locator key point of entomophthora activity orientation 1(, two location reference points)
As shown in Figure 1,32 m * 24 m * 6 m(length * wide * height) the entomophthora movement monitoring of horizontal warehouse arranges planimetric map, this grain bulk height is 6 m, so establish two monitor layers, every one deck is established 12 monitoring points, it is distributed as: the monitoring point of close Cang Qiang is from wall distance 4 m, spacing 8 m between the monitoring point; The time interval of detecting is 7 days, the data mark of gained is the right side of each monitoring point in the drawings, wherein the top data are that (unit: %), the below data are the carbon dioxide concentration determination numerical value (unit: %) of 6 m monitoring points for the carbon dioxide concentration determination numerical value of 3 m monitoring points.The data of analyzing and testing, and with the detected value of each monitoring point and last detection data comparison, detected value is the lower floor of (4), (5) and (8) greater than 1% monitoring point, a more front detected value increase surpass 0.2% be the lower floor of (5) monitoring point, increased 1.21%; Before not having gas concentration lwevel, other once increase by 0.5% monitoring point, so only have (5) monitoring point to can be used as the locator key point.Compare each adjacent monitoring point of (5) monitoring point and the difference of a front detected value, increased value has above 0.1% monitoring point: (4) monitoring point increases 0.12%, (8) monitoring point increases 0.18%, and the carbon dioxide detected value of other monitoring points increases all less than 0.1%.With (4) and (8) monitoring point as the location reference point.
The method of location is by shown in Figure 2, in (5) monitoring point, grain heap surface to (4) and (8) position, monitoring point rule, go out the center of gravity position of line with the weight calculation of these 3 detected values, the distance of center of gravity position at a distance of (5) monitoring point that for example can calculate (5) and (8) monitoring point line is 8 m * 1.85/ (2.56+1.85)=3.36 m, and the distance of center of gravity position at a distance of (5) monitoring point that can calculate equally (5) and (4) monitoring point line is 2.71 m.Mark two center of gravity positions, and draw the center of gravity line at the grain face, again take the gas concentration lwevel detected value of (4) and (8) monitoring point as weight, can calculate the coordinate at the projection position of entomophthora activity centre on the grain face, namely be positioned at take (5) and the focus point of (8) monitoring point line as starting point, length is on the position of 41.2% center of gravity line.Because the entomophthora moving point is in lower floor, so in the cylindrical space of the movable position of concrete entomophthora below grain face projection position 3 m.
Embodiment 2: locator key point of entomophthora activity orientation 2(, three location reference points)
Fig. 3 is 32 m * 24 m * 6 m(length * wide * height) the entomophthora movement monitoring of horizontal warehouse arranges planimetric map, this grain bulk height is 6 m, establishes equally two monitor layers, and every one deck is established 12 monitoring points, it is distributed as: the monitoring point of close Cang Qiang is from wall distance 4 m, spacing 8 m between the monitoring point; The time interval of detecting is 7 days, the data mark of gained is the right side of each monitoring point in the drawings, wherein the top data are that (unit: %), the below data are the carbon dioxide concentration determination numerical value (unit: %) of 6 m monitoring points for the carbon dioxide concentration determination numerical value of 3 m monitoring points.The data of analyzing and testing, and with the detected value of each monitoring point and last detection data comparison, detected value is (8a) and lower floor (9a) greater than 1% monitoring point, the monitoring point that a more front detected value increases above 0.2% is the lower floor of (9a) monitoring point, increase 0.63%, once increase by 0.5% monitoring point before other do not have gas concentration lwevel: so only have (9a) monitoring point to can be used as the locator key point.Compare each adjacent monitoring point of (9a) monitoring point and the difference of a front detected value, increased value has above 0.1% monitoring point: (8a) monitoring point increases 0.17%, (11a) monitoring point increases 0.14%, (12a) monitoring point increases 0.16%, and the carbon dioxide detected value of other monitoring points increases all less than 0.1%.With (8a), (11a) and (12a) monitoring point as the location reference point.
The method of location is by shown in Figure 4, pile (9a) monitoring point, surface respectively to (8a) at grain, (11a) and (12a) position, monitoring point line, go out the center of gravity position of line with the weight calculation of these 3 detected values, the distance of center of gravity position at a distance of (9a) monitoring point that for example can calculate (9a) and (8a) monitoring point line is 8 m * 1.15/ (1.15+1.86)=3.01 m, the distance of center of gravity position at a distance of (11a) monitoring point that can calculate equally (9a) and (11a) monitoring point line is 7.57 m, and the center of gravity position of (9a) and (12a) monitoring point line is 2.64 m at a distance of the distance of (9a) monitoring point.Mark three center of gravity positions, and adjacent center of gravity position line is linked to each other, draw leg-of-mutton zone at the grain face, the geometric center of gravity of this delta-shaped region is exactly the projection position of entomophthora activity centre on the grain face.The entomophthora moving point is in grain heap lower floor, so the movable position of the entomophthora of this silo is in the following cylindrical space of grain face projection position 3 m.
Claims (1)
1. the method for entomophthora activity orientation during the grain of a silo foodstuff preservation is piled, it is characterized in that: the concrete measure of described method is as follows:
A, the density of carbon dioxide gas monitoring point is set in grain heap: the grain bin bottom monitor layer that at first at position beyond wall 1 m-4 m, in the bottom section of silo terrace 0 m-1 m, is consisted of by several density of carbon dioxide gas monitoring points with the row, column spacing setting of 4 m-8 m, arrange with the spacing every 2 m-3 m in the grain bulk height direction afterwards that each monitoring point quantity of one deck and grain bin bottom monitor layer equates, the corresponding monitor layer in position, and the top layer monitor layer is piled surface distance 〉=3 m apart from grain;
B, the detection of carrying out grain heap density of carbon dioxide gas and the arrangement of detected value: the density of carbon dioxide gas that carries out each monitoring point take 5 d-10 d as the cycle detects, each detected value of each monitoring point and a front detected value are compared, select detected value greater than 1%, and this detected value is put the position of a front detected value large 0.2% than this, or the concentration increment size that detects of twice carbon dioxide in same monitoring point greater than 0.5% position as the locator key point; Relatively same layer is put the density of carbon dioxide gas of adjacent monitoring point with each locator key, selects respectively a more front detected value and increases and surpass 0.1% position as locating reference point; If it is adjacent to reach the position of locator key point index, determine that the larger position of detected value or gas concentration lwevel increment size is the locator key point, all the other are the location reference point;
C, to the space orientation of entomophthora moving point: on the grain face centered by each locator key point, draw and the line of locating reference point, take each monitoring point density of carbon dioxide gas detected value as weight, according to the method for Calculating Torque during Rotary, the center of gravity position of each bar line of calculative determination; If it is adjacent that locator key point is not located reference point, locator key is selected and is the projection of entomophthora activity centre on the grain face; If the locator key point only has an adjacent positioned reference point to connect a line, then focus point namely is that the projection position on grain heap surface is selected in the entomophthora activity centre; If the locator key point has two lines of two location adjacent connections of reference point, then connect two focus points and make a new line, the weight calculation that recycles two the location reference point detected values center of gravity position of line that makes new advances is for select at the surperficial projection position of grain heap the entomophthora activity centre; 2 location reference points are adjacent to connect into many lines if locator key point surpasses, then line is made at adjacent center of gravity position, can form a zone at the grain face, this regional geometric center is in the grain heap the movable position of entomophthora correspondence at the projection position on grain heap surface; The area of space of entomophthora activity be arranged in the cylindricality zone of 3 meters of corresponding, tops, reference point plane of living in, location, the projection position of determining.
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| CN107356289A (en) * | 2017-07-18 | 2017-11-17 | 山东浪潮通软信息科技有限公司 | A kind of grain monitoring and pre-alarming method of the multisensor based on ZigBee |
| CN109007015A (en) * | 2018-06-15 | 2018-12-18 | 河南工业大学 | The method and its control device of grain storage mycotoxin pollution in accurate prevention and control silo |
| CN116380289A (en) * | 2023-05-24 | 2023-07-04 | 中央储备粮镇江直属库有限公司 | Automatic grain temperature monitoring and analyzing system for granary |
| CN118311214A (en) * | 2024-06-11 | 2024-07-09 | 北京良安科技股份有限公司 | Early warning method and device for mildew of grains in granary, storage medium and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107356289A (en) * | 2017-07-18 | 2017-11-17 | 山东浪潮通软信息科技有限公司 | A kind of grain monitoring and pre-alarming method of the multisensor based on ZigBee |
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| CN118311214A (en) * | 2024-06-11 | 2024-07-09 | 北京良安科技股份有限公司 | Early warning method and device for mildew of grains in granary, storage medium and electronic equipment |
| CN118311214B (en) * | 2024-06-11 | 2024-08-20 | 北京良安科技股份有限公司 | Early warning method and device for mildew of grains in granary, storage medium and electronic equipment |
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| CN103323571B (en) | 2014-12-17 |
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