CN102735313B - Method for determining middle material level curve of continuous passive nuclear material level gage - Google Patents
Method for determining middle material level curve of continuous passive nuclear material level gage Download PDFInfo
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- CN102735313B CN102735313B CN201210203684.6A CN201210203684A CN102735313B CN 102735313 B CN102735313 B CN 102735313B CN 201210203684 A CN201210203684 A CN 201210203684A CN 102735313 B CN102735313 B CN 102735313B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/288—X-rays; Gamma rays or other forms of ionising radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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Abstract
The invention relates to the technical field of passive nuclear material level measurement, in particular to a method for determining a middle material level curve of a continuous passive nuclear material level gage. The method adopts a direct method and comprises the following steps that firstly, the continuous passive nuclear material level gage is arranged in a selected position; then, the material level is determined in other measurement modes, and the intensity of gamma rays corresponding to different material levels are measured in different material levels according to the measurement precision requirement; and finally, the material levels are determined according to the practically measured gamma ray intensity, and a reckoning method or a reference method can also be adopted for replacing the direct method. The method has the advantages that the blanks in the prior art are filled, the method applicable to the continuous passive nuclear material level gage for determining the material level and gamma ray intensity relationship is provided, firm foundation is provided for accurately determining the material level, the method capable of realizing the mutual replacement among the direct method, the fitting prediction method and the reference method according to the practical measurement conditions is provided, the selectivity during the user measurement according to the practical measurement conditions is improved, and the method can also be used as a checking method for improving the data reliability.
Description
[technical field]
The present invention relates to passive nucleon level gauging technical field, specifically the method for material level curve in the passive nucleon level-sensing device of a kind of definite continous way.
[background technology]
In industries such as chemical industry, metallurgy, coal, electric power, in the process of convey materials, often need to measure the material level in hopper, feed bin.
The existing method of utilizing gamma rays to measure thing position mainly contains two kinds: a kind of is traditional nucleon level-sensing device with radioactive source, the automatic charge level control device of one as disclosed in domestic patent CN202230393, its essence is and utilize the symmetrical gamma ray post in left and right to measure the material level in material level storehouse, another kind is not to be with radioactive source, utilize the natural gamma rays of tested material and environment measure thing position without radioactive source nucleon level-sensing device, be called for short passive nucleon level-sensing device, passive nucleon level-sensing device makes just to utilize without radioactive source the gamma radiation in gamma radiation and the tested container place environment of tested material self to realize non-cpntact measurement thing position and becomes effectively simple and feasible, make originally need to use the field of nucleon level-sensing device to be replaced by passive nucleon level-sensing device, greatly reduce the usage quantity of radioactive source, remove high radioactive source handling cost from, reduce radiation risk.
Passive nucleon level-sensing device can be divided into again to switching regulator and two kinds of forms of continous way according to the alarm mode of level gauging.The passive nucleon level-sensing device of switching regulator is the level meter that can only differentiate height of materials and whether reach desired location output switching signal; And continous way level meter refers to the level meter that can tell concrete height of materials and export one or more continuous material level signals.
For the passive nucleon level-sensing device of continous way, material level curve is the corresponding relation curve of height of materials and gamma ray intensity, and therefore definite aligning of material level curve really judges that material level plays very crucial effect.As domestic patent CN200810017274 provides a kind of desirable computing method that are not inconsistent very much with reality, be used for calculating the corresponding curve of thing position and the radioactive intensity measuring.The method is for convenience of calculation, first body radioactive source is simplified to plane redicaotire active Source, the position of the measurement point of next body radioactive source side is reduced to plane redicaotire active Source overhead a bit, last again any ideal situation of plane overhead, expand in the practical application that does not meet this ideal model, the variation tendency of the curve calculating is thus at measurement point during near material interface, with actual be contrary, so there is no practical value.
The and for example a kind of disclosed method of utilizing natural radioactive measurement thing position of domestic patent CN03115824, its method is in the situation of known material level, increase gradually material, the gamma rays of continuous coverage simultaneously activity, obtain height of materials and gamma rays activity point one to one, connecting all measurement points, to obtain a continuous curve be material level curve.The applicable prerequisite of the method is known material level, and knows the material level in each moment, but under actual conditions, the method is difficult to realize reason three: the first, conventionally can not promptly and accurately know material level; The second,, in order to obtain gamma ray intensity value more accurately, need certain response time; The 3rd, due to the randomness of gamma rays, actual measurement to gamma ray intensity value be a scope.
[summary of the invention]
The object of the invention is to make up the deficiencies in the prior art, a kind of method that can precisely determine material level curve in the passive nucleon level-sensing device of continous way is provided.
For achieving the above object, design the method for material level curve in the passive nucleon level-sensing device of a kind of definite continous way, comprise measurement mechanism and computing module, it is characterized in that the method adopts direct method, comprises following steps:
(a) passive continous way nucleon level-sensing device is arranged on to select location, makes its setting height(from bottom) meet the requirement for height of warning, installation direction will make gamma horse ray detector wherein can survey the gamma ray intensity of tested material and tested container;
(b) a known material level place arbitrarily in measurement range, records gamma ray intensity and variation range thereof that the passive nucleon level-sensing device of continous way measures, obtains a line segment in material level and gamma ray intensity plane;
(c) according to required measuring accuracy, change material level, record gamma ray intensity and variation range thereof that the passive nucleon level-sensing device of continous way measures, obtain another line segment in material level and gamma ray intensity plane;
(d) repeating step (c);
(e) connect the maximum point of the line segment obtaining, then connect the smallest point of the line segment obtaining, obtain the variation tendency of the gamma ray intensity that different material levels are corresponding, i.e. a thicker material level curve;
(f) according to this material level curve, obtain the scope of material level according to the gamma ray intensity of actual measurement, its intermediate value is exactly tested material level.
The method adopts predication method to substitute direct method, comprises following steps:
(a) linear fit is calculated, when material full (material level is H), measures gamma ray intensity Nh; When material empty (material level is L), measure gamma ray intensity Nl, when actual measurement, when the gamma ray intensity measuring is N, material level is now according to computing formula h=L+ (H-L) * (N-Nl)/(Nh-Nl) calculate.
(b) curve is calculated, measure and expect empty two the gamma ray intensity values of full and material, repeatedly change again material level, utilize running fix method to determine this material level value, measure gamma ray intensity that should material level simultaneously, obtain multiple material levels empty of full including material of material and the corresponding point of gamma ray intensity, these points of recycling Cubic Curve Fitting, obtain the relation curve of gamma ray intensity and material level, when actual measurement, with the gamma ray intensity value measuring and this relation curve, calculate corresponding material level.
The method adopts with reference to method and substitutes direct method, comprises following steps:
(a) near environmental radiation resemblance tested container, selection can determine material level, tested material, the similar container of dress same, and passive continous way nucleon level-sensing device is arranged on to the position similar to the measuring position of tested container;
(b) measure gamma ray intensity Nh and the Nl of the full and material of material when empty, gamma ray intensity Nh and Nl when full and material is empty as the material at actual tested container place.
(c) passive continous way nucleon level-sensing device is installed back to the select location of tested container, actual measurement gamma ray intensity N, and with just now definite material sky, material surjection line strength Nh and Nl, obtain actual material level h=L+ (H-L) * (N-Nl)/(Nh-Nl) according to predication method.
Described predication method is applicable to determine full material and the situation of expecting empty two states completely in tested container, comprises situation that can not determine concrete middle material level, obtains the corresponding relation of gamma ray intensity and material level.
Describedly be applicable to all situations with reference to method, comprise and can not determine actual material level, can not determine that material in tested container is full, the situation of material dummy status.
Described predication method and be a thicker curve with reference to the material level curve in method, the corresponding gamma ray intensity scope of each material level; Each gamma ray intensity measuring also corresponding material level scope on this curve, this scope is exactly the measuring accuracy of the passive nucleon level-sensing device of this continous way;
The running fix method of using in curve in described predication method, under a certain material level state, from the top down or the from bottom to top passive nucleon level-sensing device of mobile continous way, measure gamma ray intensity simultaneously, obtain one group of data that change, in these group data, the measuring position of the maximum passive nucleon level-sensing device of the corresponding continous way of number of the difference of adjacent two data is exactly actual material level.
The present invention compared with prior art, make up the blank of prior art, definite material level of the passive nucleon level-sensing device of continous way and the method for gamma ray intensity relation of being applicable to is provided, for Accurate Determining material level provides solid foundation, the present invention proposes direct method, matching predication method and with reference to the three kinds of methods that can mutually replace according to actual measurement situation of method, both increase the selectivity according to actual measurement situation when user measures, can be used as again the confidence level of method of inspection raising data.
[brief description of the drawings]
Fig. 1 is the passive nucleon level-sensing device internal hardware structural representation the present invention relates to;
Fig. 2 is the passive nucleon level-sensing device application schematic diagram the present invention relates to;
Fig. 3 is the material level curve map that the embodiment of the present invention measures;
The passive nucleon level-sensing device of the 1. material passive nucleon level-sensing device 4. of 2. tested container 3. support in figure
[embodiment]
The present invention will be further described by reference to the accompanying drawings, and the method can realize professional and technical personnel in the field.
The proposition of the inventive method is in order to be applicable to continous way level-sensing device, wish the accurate thing of variation, the continuous wave output position signal along with height of materials, the basic scheme of design is: install and meet the passive nucleon level-sensing device of continous way that sensitivity requires in the measurement point position determining, within definite response time, measure gamma ray intensity, definite gamma ray intensity measuring and the relation curve of thing position, the gamma ray intensity value arriving according to actual measurement, exports tested material level.
The realization of the direct method that the present invention proposes will first be determined material level in conjunction with additive method, method is not limited to Mobile Method and hammering method, according to measuring accuracy requirement, gamma ray intensity scope corresponding to the different material levels of repeated measurement, record gamma ray intensity and variation range thereof that the passive nucleon level-sensing device of continous way measures, obtain thus a point on material level curve, and then in all sorts of ways, change material level, repeat above-mentioned steps, can obtain again the another one point on material level curve, so repeatedly repeat, can obtain many points, these points are linked up, just can obtain the variation range of the gamma ray intensity that different controlling levels are corresponding.In fact obtain like this be a comparison " slightly ", the corresponding gamma ray intensity scope of each material level, the also material level curve of a corresponding material level scope of each gamma ray intensity value.Find abundant point to make the curve smoothing linking up as far as possible, met the accuracy requirement of the passive nucleon level-sensing device of continous way by material level scope corresponding to the gamma ray intensity value measuring.Then judge material level scope according to the gamma ray intensity of actual measurement.
Method provided by the invention is applied in continous way flying dust level-sensing device, measure the material level of electric precipitator or sack cleaner ash bucket, electric precipitator used or sack cleaner ash bucket are illustrated in figure 2 the shape of falling rectangular pyramid steel plate structure, height 5-8 rice, inclination angle 60 is spent, outside is provided with the insulation material that 20-40cm is thick and protects the color steel of insulation material, inner tested material is the temperature that forms after coal dust firing at the flying dust of 135-450 DEG C, in view of the temperature of flying dust, stickiness and fall grey impulsive force and stronger gamma radiation thereof, it is ideal in the position monitoring of ash bucket ash, adopting method of the present invention.
The passive nucleon level-sensing device using in embodiment mainly comprises as shown in Figure 1: (1) gamma ray detectors, select NaI scintillation detector, for measuring the gamma ray intensity of tested material and tested container place environment; (2) signal processing module, for the treatment of collected gamma ray intensity signal, send alerting signal, remove alerting signal according to predefined switching point in conjunction with software, or according to the electronic circuit of the relation output continuous material level signal of the gamma ray intensity obtaining in advance and material level; (3) material level signal output module, for the electronic circuit of the alerting signal of signal processing module output, alarm release signal, the output of material level signal, can be light, sound, I/O mouth, relay, analogue quantity output circuit, communication interface etc.; (4) supplementary module, comprises mounting bracket, improves the ray shielding device, cable splice, antenna of signal to noise ratio (S/N ratio), for the handheld device of the relation curve parameter of configuration switch point or gamma ray intensity and material level, for the communication facilities of exchange message between passive nucleon level-sensing device etc.; (5) software, for controlling gamma detector, processes gamma signal output alarm signal, releasing alerting signal or continuous material level signal, realizes the set of all correlative codes of communication or man-machine conversation etc. function.
Adopt direct method measuring process as follows:
(a) continous way flying dust level-sensing device is arranged on to 3/4 position of bin length, makes the detection direction of continous way flying dust level-sensing device aim at ash bucket, and start to measure gamma ray intensity;
(b) change material level, with other level gauging device measurings and confirm material level, record gamma ray intensity that the passive nucleon level-sensing device of continous way measures and the variation range in the time that confidence level is 99% thereof, obtain a line segment on material level curve;
(c) repeating step (b), until there are the data of enough accuracy, wants more than 50 times conventionally;
(d) connect the line segment obtaining, obtain the variation tendency of the gamma ray intensity that different material levels are corresponding, i.e. material level curve, according to this material level curve, the corresponding material level scope of each gamma ray intensity value, lid scope is exactly measuring accuracy;
(e), according to the gamma ray intensity N of actual measurement and above-mentioned material level curve, obtain current ash position scope.
Owing to confirming that material level is more difficult, but can confirm that material is full and expect empty these two states, just adopt predication method to measure, step is as follows:
(a) continous way flying dust level-sensing device is arranged on to 3/4 position of bin length, makes the detection direction of continous way flying dust level-sensing device aim at ash bucket, and start to measure gamma ray intensity;
(b) in the time of the full sky of ash bucket (ash position is L), records the empty gamma ray intensity Nl of material;
(c) in the time rule of thumb confirming that ash bucket is full up (ash position is H), records the empty gamma ray intensity Nh of material;
(d) in the time of actual measurement, the relation of the gamma ray intensity N measuring and ash position h now: h=L+ (H-L) * (N-Nl)/(Nh-Nl), and input continous way flying dust level-sensing device;
(e), according to the gamma ray intensity N of actual measurement and above-mentioned material level curve, obtain current ash position scope.
Sometimes, the also more difficult acquisition of the full value of material, uses with reference to method and measures the full value of material, then use predication method, and step is as follows:
(a) continous way flying dust level-sensing device is arranged on to 3/4 position of bin length, makes the detection direction of continous way flying dust level-sensing device aim at ash bucket;
(b) in the time of the full sky of ash bucket (material level is L), record the empty gamma ray intensity Nl of material;
(c) continous way flying dust level-sensing device is lifted down, differing heights place below installation site, keeps same distance with ash bucket, measures facing to ash bucket.Judge ash position by running fix method, confirm that ash position, to after over half, in ash bucket the latter half, finds the region that gamma ray intensity is the strongest, be approximately the full gamma ray intensity Nh of material with this strongest gamma ray intensity;
(d) continous way flying dust level-sensing device is installed back to installation site, the relation of the gamma ray intensity N measuring and ash position h now: h=L+ (H-L) * (N-Nl)/(Nh-Nl), and input continous way flying dust level-sensing device;
(e) continous way flying dust level-sensing device, in installation site, according to the gamma ray intensity N of actual measurement and above-mentioned relation formula, obtains ash position h.
Obtain material level curve as shown in Figure 3 according to said method, along with the increase of controlling level, gamma ray activity is in rising trend, the corresponding gamma ray intensity scope of each material level H (A1, A2), when actual measurement, often measure a gamma ray intensity value A, it is corresponding is also the scope (H1, H2) of a material level, that is measuring accuracy.Direct method, matching predication method and can mutually replace according to actual measurement operating mode with reference to three kinds of methods of method, also can be used as the method for inspection, improves the confidence level of data.
Claims (3)
1. a method for material level curve in the passive nucleon level-sensing device of definite continous way, is characterized in that the method adopts predication method, comprises following steps:
(a) linear fit is calculated, in the time that material is full, material level is H, measures gamma ray intensity Nh; In the time that material is empty, material level is L, measures gamma ray intensity Nl, and when actual measurement, when the gamma ray intensity measuring is N, material level is now according to computing formula h=L+ (H-L) * (N-Nl)/(Nh-Nl) calculate;
(b) curve is calculated, measure and expect empty two the gamma ray intensity values of full and material, repeatedly change again material level, utilize running fix method to determine this material level value, measure gamma ray intensity that should material level simultaneously, obtain multiple material levels empty of full including material of material and the corresponding point of gamma ray intensity, these points of recycling Cubic Curve Fitting, obtain the relation curve of gamma ray intensity and material level, when actual measurement, with the gamma ray intensity value measuring and this relation curve, calculate corresponding material level.
2. the method for material level curve in the passive nucleon level-sensing device of a kind of definite continous way as claimed in claim 1, it is characterized in that described predication method is applicable to determine full material and the situation of expecting empty two states completely in tested container, comprise the situation of concrete middle material level, obtain the corresponding relation of gamma ray intensity and material level.
3. the method for material level curve in the passive nucleon level-sensing device of a kind of definite continous way as claimed in claim 1, the described running fix method in described curve reckoning, is characterized in that:
(a) under a certain material level state, the from the top down or from bottom to top passive nucleon level-sensing device of mobile continous way is measured gamma ray intensity simultaneously, obtains one group of data that change;
(b) in these group data, the measuring position of the maximum passive nucleon level-sensing device of the corresponding continous way of number of the difference of adjacent two data is exactly actual material level.
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| CN201210203684.6A CN102735313B (en) | 2012-06-19 | 2012-06-19 | Method for determining middle material level curve of continuous passive nuclear material level gage |
| PCT/CN2012/080196 WO2013189124A1 (en) | 2012-06-19 | 2012-08-16 | Method of determining material-level curve in continuous-type passive nucleonic level gauge |
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| CN201210203684.6A CN102735313B (en) | 2012-06-19 | 2012-06-19 | Method for determining middle material level curve of continuous passive nuclear material level gage |
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| CN104089681A (en) * | 2014-07-03 | 2014-10-08 | 胡桂标 | Portable level gage |
| CN104390677B (en) * | 2014-11-08 | 2018-03-13 | 胡桂标 | The background radiation amendment measuring method and its system of passive nuclear level sensing device |
| CN104482996B (en) * | 2014-12-24 | 2019-03-15 | 胡桂标 | The material kind of passive nuclear level sensing device corrects measuring system |
| CN104568061A (en) * | 2015-01-14 | 2015-04-29 | 上海沃纳机电科技有限公司 | Multi-probe passive nuclear level meter |
| CN108387293A (en) * | 2018-06-05 | 2018-08-10 | 上海云鱼智能科技有限公司 | The passive nuclear level sensing device of combined type mechanically and its measurement method |
| CN113375757B (en) * | 2020-03-27 | 2022-12-02 | 洛森自动化科技（上海）有限公司 | Method for measuring material level by applying curve simulation and nuclear radiation principle |
| CN114166157B (en) * | 2021-12-08 | 2023-10-20 | 国能锅炉压力容器检验有限公司 | Intelligent quantitative method for oxide skin in tube according to ray intensity curve |
| CN115178339B (en) * | 2022-04-11 | 2023-04-25 | 北京智冶互联科技有限公司 | Automatic control method and device for rolling operation, electronic equipment and medium |
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| WO2013189124A1 (en) | 2013-12-27 |
| CN102735313A (en) | 2012-10-17 |
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