CN102735313A - 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 PDF

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CN102735313A
CN102735313A CN2012102036846A CN201210203684A CN102735313A CN 102735313 A CN102735313 A CN 102735313A CN 2012102036846 A CN2012102036846 A CN 2012102036846A CN 201210203684 A CN201210203684 A CN 201210203684A CN 102735313 A CN102735313 A CN 102735313A
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material level
gamma ray
ray intensity
curve
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CN102735313B (en
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郭云昌
朱敏娟
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郭云昌
朱敏娟
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Priority to PCT/CN2012/080196 priority patent/WO2013189124A1/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating 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
    • G01F23/28Indicating 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
    • G01F23/284Electromagnetic waves
    • G01F23/288X-rays; Gamma rays or other forms of ionising radiation
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/20Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level

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

The method of material level curve in the passive nucleon level-sensing device of a kind of definite continous way
[technical field]
The present invention relates to passive nucleon level gauging technical field, the method for material level curve in the passive nucleon level-sensing device of a kind of specifically 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, the feed bin.
Existing utilize the method for gamma rays measurement object position to mainly contain two kinds: a kind of is the nucleon level-sensing device of traditional band radioactive source; Like the disclosed a kind of automatic charge level control device of domestic patent CN202230393, its essence is that gamma ray post symmetrical about utilization measures the material level in the material level storehouse; Another kind then is not to be with radioactive source; Utilize the no radioactive source nucleon level-sensing device of the natural gamma rays measurement object position of tested material and environment; Be called for short passive nucleon level-sensing device; Passive nucleon level-sensing device makes the gamma radiation property and the gamma radiation property realization non-cpntact measurement thing position in the environment of tested container place that just utilize tested material self without radioactive source become simple effectively with feasible, makes script need to use the field of nucleon level-sensing device to be replaced by passive nucleon level-sensing device, has significantly reduced the usage quantity of radioactive source; Remove high radioactive source handling cost from, reduced the radiation risk.
Alarm mode according to level gauging can be divided into switching regulator and two kinds of forms of continous way with passive nucleon level-sensing device again.The passive nucleon level-sensing device of switching regulator is to differentiate the level meter whether height of materials reaches desired location and output switching signal; And the continous way level meter is meant 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, the material level curve is the corresponding relation curve of height of materials and gamma ray intensity, so definite aligning of material level curve judges that really material level plays very crucial effect.Like domestic patent CN200810017274 a kind of desirable computing method that are not inconsistent very much with reality are provided, have been used for calculating the corresponding curve of thing position and the radioactive intensity that measures.This method is for convenience of calculation; At first be simplified to planar radioactive source to the body radioactive source, the position of the measurement point of next body radioactive source side is reduced to the planar radioactive source sky a bit, and is last again overhead any the ideal situation in plane; Expand in the practical application that does not meet this ideal model; The variation tendency of the curve that calculates thus is at measurement point during near material interface, with actual be opposite, so there is not practical value.
The disclosed a kind of method of utilizing natural radioactive measurement thing position of and for example domestic patent CN03115824; Its method is under the situation of known material level; Increase material gradually; Simultaneously continuous coverage gamma rays activity obtains height of materials and gamma rays activity point one to one, and connecting all measurement points, to obtain a continuous curve be the material level curve.The suitable prerequisite of this method is known material level, and knows each material level constantly, but under actual conditions, this method is difficult to realize that reason has three: the first, can not promptly and accurately know material level usually; The second, in order to obtain gamma ray intensity value more accurately, need certain response time; The 3rd because the randomness of gamma rays, actual measurement to the gamma ray intensity value be a scope.
[summary of the invention]
The objective of the invention is to remedy the deficiency of prior art, a kind of method that can precisely confirm material level curve in the passive nucleon level-sensing device of continous way is provided.
For realizing above-mentioned purpose, 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 this method adopts direct method, comprises following steps:
(a) the passive nucleon level-sensing device of continous way is installed in select location, makes its setting height(from bottom) meet the requirement for height of warning, installation direction will make wherein gamma horse ray detector can survey the gamma ray intensity of tested material and tested container;
(b) the material level place that can know arbitrarily in measurement range, gamma ray intensity and variation range thereof that the passive nucleon level-sensing device of record continous way measures obtain a line segment on material level and the gamma ray intensity plane;
(c) according to required measuring accuracy, change material level, gamma ray intensity and variation range thereof that the passive nucleon level-sensing device of record continous way measures obtain another line segment on material level and the gamma ray intensity plane;
(d) repeating step (c);
(e) connect the maximum point of the line segment obtain, connect the smallest point of the line segment that obtains again, obtain the variation tendency of the corresponding gamma ray intensity of different material levels, a promptly 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.
This 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, during actual measurement, when the gamma ray intensity that measures is N, then the material level of this moment is according to computing formula h=L+ (H-L) * (N-Nl)/(Nh-Nl) calculate.
(b) curve fitting is calculated, measures full and empty two the gamma ray intensity values of material of material, repeatedly changes material level again; Utilize the running fix method to confirm this material level value; Measure simultaneously gamma ray intensity that should material level, obtain comprising material is full and material the is empty a plurality of material levels and the corresponding point of gamma ray intensity, utilize these points of cubic curve match again; Obtain the relation curve of gamma ray intensity and material level; During actual measurement,, calculate corresponding material level with the gamma ray intensity value that measures and this relation curve.
This method adopts with reference to method and substitutes direct method, comprises following steps:
(a) near environmental radiation resemblance tested container, selection can confirm material level, dress is with container a kind of tested material, similar, and the passive nucleon level-sensing device of continous way is installed in the position similar with 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) the passive nucleon level-sensing device of continous way is installed back the select location of tested container; Actual measurement gamma ray intensity N; And, obtain actual material level h=L+ (H-L) * (N-Nl)/(Nh-Nl) according to predication method with the material sky, material surjection line strength Nh and the Nl that confirmed just now.
Said predication method is applicable to can confirm full material and the situation of expecting empty two states fully in the tested container, comprises the situation of being not sure of concrete middle material level, obtains the corresponding relation of gamma ray intensity and material level.
Saidly be applicable to all situations, comprise and be not sure of actual material level, can not confirm that material in the tested container is full, the situation of material dummy status with reference to method.
Said predication method and be a thicker curve with reference to the material level curve in the method, the corresponding gamma ray intensity scope of each material level; Each gamma ray intensity that measures is also corresponding material level scope on this curve, and 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 the curve fitting in the described predication method; Be under a certain material level state; Move the passive nucleon level-sensing device of continous way from the top down or from bottom to top; Measure gamma ray intensity simultaneously, obtain one group of data that change, the measuring position of the passive nucleon level-sensing device of the pairing continous way of number of the difference maximum of adjacent two data is exactly actual material level in these group data.
The present invention compared with prior art; Remedied the blank of prior art; The definite material level that is applicable to the passive nucleon level-sensing device of continous way and the method for gamma ray intensity relation are provided, for accurately measuring material level solid foundation are provided, the present invention proposes direct method, match predication method and three kinds can be according to the method for actual measurement situation mutual alternative with reference to method; Both increased when the user measures according to the selectivity of actual measurement situation, can be used as the confidence level that the method for inspection improves data again.
[description of drawings]
Fig. 1 is the passive nucleon level-sensing device internal hardware structural representation that the present invention relates to;
Fig. 2 is that the passive nucleon level-sensing device that the present invention relates to is used synoptic diagram;
Fig. 3 is the material level curve map that the embodiment of the invention measures;
1. materials, 2. tested containers, 3. passive nucleon level-sensing device 4. passive nucleon level-sensing device supports among the figure
[embodiment]
In conjunction with accompanying drawing the present invention is further specified, this method can realize this area professional and technical personnel.
The proposition of the inventive method is in order to be applicable to the continous way level-sensing device; Hope is along with the variation of height of materials, export accurate thing position signal continuously; The basic scheme of design is: meet the passive nucleon level-sensing device of continous way that sensitivity requires confirming that good measurement point position is installed, in the response time of confirming, measure gamma ray intensity, the gamma ray intensity of confirming to measure and the relation curve of thing position; According to the gamma ray intensity value that actual measurement is arrived, export tested material level.
The realization of the direct method that the present invention proposes will combine additive method to confirm material level earlier, and method is not limited to the method for moving and hammering method, according to the measuring accuracy requirement; The corresponding gamma ray intensity scope of the different material levels of repeated measurement, gamma ray intensity and variation range thereof that the passive nucleon level-sensing device of record continous way measures obtain a point on the material level curve thus; And then in all sorts of ways, change material level, repeat above-mentioned steps; Can obtain the another one point on the material level curve again, repeat so repeatedly, can obtain many points; Link up these points, just can obtain the variation range of the corresponding gamma ray intensity of different controlling levels.In fact like this obtain be a comparison " slightly ", the also material level curve of a corresponding material level scope of the corresponding gamma ray intensity scope of each material level, each gamma ray intensity value.Find abundant point to make as far as possible and meet the accuracy requirement of the passive nucleon level-sensing device of continous way by the corresponding material level scope of the gamma ray intensity value that measures by the curve smoothing that links up.Judge the material level scope according to the gamma ray intensity of actual measurement then.
Method provided by the invention is applied in the continous way flying dust level-sensing device; Measure the material level of electric precipitator or sack cleaner ash bucket; Used electric precipitator or sack cleaner ash bucket are illustrated in figure 2 as the shape of falling rectangular pyramid steel plate structure, highly 5-8 rice, inclination angle 60 degree, outside are provided with the color steel of thick insulation material of 20-40cm and protection insulation material; Inner tested material is the temperature that forms behind the coal dust firing at 135-450 ℃ flying dust; In view of temperature, the stickiness of flying dust and the fall impulsive force of ash and stronger gamma radiation property thereof, it is very desirable in the position monitoring of ash bucket ash, adopting method of the present invention.
The passive nucleon level-sensing device that uses among the embodiment is as shown in Figure 1 mainly to be comprised: (1) gamma ray detectors, select the NaI scintillation detector for use, and be used to measure the gamma ray intensity of tested material and tested container place environment; (2) signal processing module; Be used to handle collected gamma ray intensity signal; Send alerting signal, remove alerting signal according to predefined switching point in conjunction with software, or export the electronic circuit of continuous material level signal according to the relation of gamma ray intensity that obtains in advance and material level; (3) material level signal output module is used 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, comprise mounting bracket, improve signal to noise ratio (S/N ratio) ray shielding device, cable splice, antenna, be used for the relation curve parameter of configuration switch point or gamma ray intensity and material level handheld device, be used for the communication facilities of exchange message between the passive nucleon level-sensing device etc.; (5) software is used to control gamma detector, handles gamma signal and output alarm signal, releasing alerting signal or continuous material level signal, realizes the set of all correlative codes of communication or man-machine conversation or the like function.
Adopt the direct method measuring process following:
(a) continous way flying dust level-sensing device is installed in 3/4 position of ash bucket height, makes the detection direction of continous way flying dust level-sensing device aim at ash bucket, and begin to measure gamma ray intensity;
(b) change material level, with other level gauging device measurings and confirm material level, write down gamma ray intensity that the passive nucleon level-sensing device of continous way measures and be 99% o'clock variation range, obtain a line segment on the material level curve in confidence level;
(c) repeating step (b) up to the data that enough accuracy is arranged, is wanted more than 50 times usually;
(d) connect the line segment obtain, obtain the variation tendency of the corresponding gamma ray intensity of different material levels, i.e. material level curve, according to this material level curve, the corresponding material level scope of each gamma ray intensity value, the lid scope is exactly a measuring accuracy;
(e), obtain current ash position scope according to the gamma ray intensity N of actual measurement and above-mentioned material level curve.
Owing to confirm relatively difficulty of material level, but can confirm full and empty these two states of material of material, just adopt predication method to measure, step is following:
(a) continous way flying dust level-sensing device is installed in 3/4 position of ash bucket height, makes the detection direction of continous way flying dust level-sensing device aim at ash bucket, and begin to measure gamma ray intensity;
(b) when the full sky of ash bucket (the ash position is L) records the empty gamma ray intensity Nl of material;
(c) when rule of thumb confirming that ash bucket is full up (the ash position is H) records the empty gamma ray intensity Nh of material;
(d) when actual measurement, the relation of the ash position h of the gamma ray intensity N that measures and this moment: h=L+ (H-L) * (N-Nl)/(Nh-Nl), and input continous way flying dust level-sensing device;
(e), obtain current ash position scope according to the gamma ray intensity N of actual measurement and above-mentioned material level curve.
Sometimes, the also difficult acquisition of the full value of material is used with reference to method and is measured the full value of material, uses predication method again, and step is following:
(a) continous way flying dust level-sensing device is installed in 3/4 position of ash bucket height, makes the detection direction of continous way flying dust level-sensing device aim at ash bucket;
(b) when 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 the installation site keeps same distance with ash bucket, measures facing to ash bucket.Judge the ash position with the running fix method, confirm that the ash position after over half, in ash bucket the latter half, finds the strongest zone of gamma ray intensity, 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 go back to the installation site, the relation of the ash position h of the gamma ray intensity N that measures and this moment: 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 according to the gamma ray intensity N of actual measurement and above-mentioned relation formula, obtains ash position h in the installation site.
Obtain material level curve as shown in Figure 3 according to said method, along with the increase of controlling level, the gamma ray activity is in rising trend; The corresponding gamma ray intensity scope of each material level H (A1, A2), during actual measurement; Whenever measure a gamma ray intensity value A; It is pairing also be a material level scope (H1, H2), that is measuring accuracy.Direct method, match predication method and can also can be used as the method for inspection according to actual measurement operating mode mutual alternative with reference to three kinds of methods of method improve the confidence level of data.

Claims (7)

1. the method for material level curve in the passive nucleon level-sensing device of definite continous way comprises measurement mechanism and computing module, it is characterized in that this method adopts direct method, comprises following steps:
(a) the passive nucleon level-sensing device of continous way is installed in select location, makes its setting height(from bottom) meet the requirement for height of warning, installation direction will make wherein gamma horse ray detector can survey the gamma ray intensity of tested material and tested container;
(b) the material level place that can know arbitrarily in measurement range, gamma ray intensity and variation range thereof that the passive nucleon level-sensing device of record continous way measures obtain a line segment on material level and the gamma ray intensity plane;
(c) according to required measuring accuracy, change material level, gamma ray intensity and variation range thereof that the passive nucleon level-sensing device of record continous way measures obtain another line segment on material level and the gamma ray intensity plane;
(d) repeating step (c);
(e) connect the maximum point of the line segment obtain, connect the smallest point of the line segment that obtains again, obtain the variation tendency of the corresponding gamma ray intensity of different material levels, a promptly 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.
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 is characterized in that this 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, during actual measurement, when the gamma ray intensity that measures is N, then the material level of this moment is according to computing formula h=L+ (H-L) * (N-Nl)/(Nh-Nl) calculate.
(b) curve fitting is calculated, measures full and empty two the gamma ray intensity values of material of material, repeatedly changes material level again; Utilize the running fix method to confirm this material level value; Measure simultaneously gamma ray intensity that should material level, obtain comprising material is full and material the is empty a plurality of material levels and the corresponding point of gamma ray intensity, utilize these points of cubic curve match again; Obtain the relation curve of gamma ray intensity and material level; During actual measurement,, calculate corresponding material level with the gamma ray intensity value that measures and this relation curve.
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 is characterized in that this method adopts with reference to the alternative direct method of method, comprises following steps:
(a) near environmental radiation resemblance tested container, selection can confirm material level, dress is with container a kind of tested material, similar, and the passive nucleon level-sensing device of continous way is installed in the position similar with 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) the passive nucleon level-sensing device of continous way is installed back the select location of tested container; Actual measurement gamma ray intensity N; And, obtain actual material level h=L+ (H-L) * (N-Nl)/(Nh-Nl) according to predication method with the material sky, material surjection line strength Nh and the Nl that confirmed just now.
4. the method for material level curve in according to claim 1 or claim 2 the passive nucleon level-sensing device of a kind of definite continous way; It is characterized in that said predication method is applicable to the situation that can confirm to expire material in the tested container and expect empty two states fully; Comprise the situation of being not sure of concrete middle material level, obtain the corresponding relation of gamma ray intensity and material level.
5. like the method for material level curve in claim 1 or the passive nucleon level-sensing device of 3 described a kind of definite continous ways; It is characterized in that saidly being applicable to all situations with reference to method; Comprise and be not sure of actual material level, can not confirm to expect in the tested container situation full, the material dummy status.
6. like the method for material level curve in claim 1 or the passive nucleon level-sensing device of 2 or 3 described a kind of definite continous ways, it is characterized in that:
(a) the material level curve is a thicker curve, the corresponding gamma ray intensity scope of each material level;
(b) each gamma ray intensity that measures 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.
7. the curve fitting in the passive nucleon level-sensing device of a kind of definite continous way as claimed in claim 2 in the method for material level curve is used the running fix method in calculating, it is characterized in that:
(a) under a certain material level state, move the passive nucleon level-sensing device of continous way from the top down or from bottom to top, measure gamma ray intensity simultaneously, obtain one group of data that change;
(b) measuring position of the passive nucleon level-sensing device of the pairing continous way of number of the difference maximum of adjacent two data is exactly actual material level in these group data.
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