CN202305439U - Coal ash and calorific value measuring system - Google Patents
Coal ash and calorific value measuring system Download PDFInfo
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- CN202305439U CN202305439U CN2011204002614U CN201120400261U CN202305439U CN 202305439 U CN202305439 U CN 202305439U CN 2011204002614 U CN2011204002614 U CN 2011204002614U CN 201120400261 U CN201120400261 U CN 201120400261U CN 202305439 U CN202305439 U CN 202305439U
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- 239000010883 coal ash Substances 0.000 title claims abstract description 50
- 239000003245 coal Substances 0.000 claims abstract description 162
- 238000005259 measurement Methods 0.000 claims abstract description 90
- 230000005251 gamma ray Effects 0.000 claims abstract description 64
- 239000002956 ash Substances 0.000 claims description 79
- 230000007246 mechanism Effects 0.000 claims description 47
- 230000009977 dual effect Effects 0.000 claims description 42
- 238000004364 calculation method Methods 0.000 claims description 34
- 238000004891 communication Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 15
- 238000012937 correction Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 229910052640 jadeite Inorganic materials 0.000 description 4
- 239000002366 mineral element Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 235000015170 shellfish Nutrition 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model provides a coal ash and calorific value measuring system. Two double-energy gamma ray transmission measuring devices are arranged in front of an inlet of coal combustion equipment and behind an outlet of the coal combustion equipment respectively, so that attenuation coefficients of coal and coal ash can be measured respectively; the coal ash and/or the calorific value are calculated by combining the attenuation coefficients of the coal and the coal ash; and therefore, the real-time measurement requirements can be met, the influence of high atomic number element content variation on coal ash and calorific value measurement is also eliminated, the coal ash measurement is not affected by variation in coal type, and the measurement accuracy is improved.
Description
Technical field
The utility model relates to the coal detection range, relates in particular to the measuring system and the measuring method thereof of a kind of ash content of coal and thermal value.
Background technology
Dual energy gamma ray transmissive method is the method for the measurement ash content of coal of present widespread use; Through measuring the attenuation coefficient of coal stream for the gamma ray of two different-energies in the dual energy gamma ray transmissive measurement mechanism; Calculate ash content of coal, and then can extrapolate the thermal value of coal through the ash content of coal value.This method is in real time quick, be convenient to operation, can be applied to preferably the coal source fixing use coal yard institute.
But the shortcoming of this method is: measurement result receives the influence of high atomic number element changes of contents in the coal bigger, and for example the variation of constituent contents such as the iron in the coal, calcium will directly influence the measurement result of ash content.For coals such as fuel-burning power plant sources complicated use coal unit because used coal is from a plurality of mines and producing region, generally speaking, its high atomic number element changes of contents is bigger, therefore uses this method measurement ash content of coal, error is bigger.And this problem is difficult to solve through demarcation, because utilize the ash content calculating parameter of demarcating, is accurately to institute's timing signal ature of coal only, and ature of coal utilizes the calculation of parameter ash content of this demarcation to produce than mistake after changing.And in practical application, that ature of coal changes is normally irregular, be difficult to predict, thus give this ash content measuring equipment in the coal source complicated situation down application bring very big difficulty.Usefulness coal units such as fuel-burning power plant are one of last links of coal utilization, and its energy resource consumption data are to estimate the truest foundation of coal utilization field effects of energy saving and emission reduction, require its measurement data accurately necessary.
Therefore, to the coal applying unit, need the measuring system and the measuring method of a kind of ash content of coal and thermal value, both the coal variable effect can accurately be measured, do not received to requirement of real time again.
The utility model content
The utility model is intended to one of solve the problems of the technologies described above at least.For this reason; The utility model proposes a kind of ash content of coal and measurement of calorific value system; Be requirement of real time, realize eliminate the influence of high atomic number again, make the measurement of ash content of coal and thermal value accurately, not receive the influence of coal variation ash content of coal and measurement of calorific value.
The utility model proposes a kind of ash content of coal and measurement of calorific value system on the one hand, comprises at least two dual energy gamma ray transmissive measurement mechanisms and calculation element.Wherein, at least one said dual energy gamma ray transmissive measurement mechanism is arranged on before the coal burning equipment entrance, is used to measure first attenuation coefficient of unburned coal for the gamma ray of said dual energy gamma ray transmissive measurement mechanism; At least one said dual energy gamma ray transmissive measurement mechanism is arranged on after the coal burning equipment outlet, is used to measure coal ash behind the said coal burning for second attenuation coefficient of the gamma ray of said dual energy gamma ray transmissive measurement mechanism; Said at least two dual energy gamma ray transmissive measurement mechanisms are connected with said calculation element respectively; So that said first and second attenuation coefficients are transferred to said calculation element; Said calculation element calculates the ash content and/or the thermal value of said coal according to said first and second attenuation coefficients.
Said first attenuation coefficient receives influencing jointly of combustible element and mineral matter element content in the coal; Said second attenuation coefficient only receives the influence of the oxide of mineral matter element; High atomic number element in the coal (like iron, calcium) changes of contents exerts an influence in first attenuation coefficient and second attenuation coefficient simultaneously; And the variation of ash content of coal only exerts an influence in first attenuation coefficient; Therefore utilize said second attenuation coefficient, can deduct the part that influenced by the high atomic number element changes of contents in said first attenuation coefficient, thereby calculate ash value and heating value accurately.
According to an embodiment of the utility model, said at least two dual energy gamma ray transmissive measurement mechanisms are connected with said calculation element respectively through cable or radio communication.
According to an embodiment of the utility model, said at least one said dual energy gamma ray transmissive measurement mechanism is arranged on the transport tape into said coal burning equipment conveying coal.
According to an embodiment of the utility model, said at least one said dual energy gamma ray transmissive measurement mechanism is arranged on the coal ash transport tape that is connected with said coal burning equipment outlet.
An embodiment according to the utility model; Said at least one said dual energy gamma ray transmissive measurement mechanism is arranged near the coal ash sample devices the outlet of said coal burning equipment, is used to measure said second attenuation coefficient of the coal ash of the said coal burning equipment output that said coal ash sample devices gathers.
An embodiment according to the utility model; Generate coal ash from the position of measuring said first attenuation coefficient to the burning back according to coal; And outputed to the system operation time of the position of measuring said second attenuation coefficient, the time in corrective delay of said ash content of coal measuring system is set; Said calculation element with said first attenuation coefficient that records through a said corrective delay times prior, calculates ash content of coal and thermal value according to current said second attenuation coefficient that records.Through the time in corrective delay of system is set, guarantee that first attenuation coefficient and second attenuation coefficient are to the measurement of same coal heap.Owing to utilize said second attenuation coefficient, deduct the part that influenced by the high atomic number element changes of contents in said first attenuation coefficient, thereby calculate ash value and heating value accurately.
According to an embodiment of the utility model, said calculation element is according to current said first attenuation coefficient that records, and the mean value of said second attenuation coefficient that records in the current time set time section forward, calculates ash content of coal and thermal value.Said set time section can be adjusted according to the actual conditions of application scenario.
The utility model proposes the measuring method of a kind of ash content of coal and thermal value on the other hand; May further comprise the steps: before coal gets into the coal burning equipment entrance, measure first attenuation coefficient of unburned coal for the gamma ray of said measurement mechanism through at least one dual energy gamma ray transmissive measurement mechanism; After coal ash is exported said coal burning equipment outlet, through second attenuation coefficient of the coal ash after at least one dual energy gamma ray transmissive measurement mechanism measurement burning for the gamma ray of said measurement mechanism; Said first attenuation coefficient and said second attenuation coefficient are transferred to calculation element respectively, and said calculation element calculates the ash content and/or the thermal value of said coal according to said first and second attenuation coefficients.
According to an embodiment of the utility model, generate coal ash from the position of measuring said first attenuation coefficient to the burning back according to coal, and outputed to the time delay of the position of measuring said second attenuation coefficient, the time in corrective delay of measuring system is set; Said calculation element with said first attenuation coefficient that records through a said corrective delay times prior, calculates the ash content and the thermal value of coal according to current said second attenuation coefficient that records.Through the time in corrective delay of system is set, guarantee that first attenuation coefficient and second attenuation coefficient are to the measurement of same coal heap.Owing to utilize said second attenuation coefficient, deduct the part that influenced by the high atomic number element changes of contents in said first attenuation coefficient, thereby calculate ash value and heating value accurately.
According to an embodiment of the utility model, said calculation element is according to current said first attenuation coefficient that records, and the mean value of said second attenuation coefficient that records in the current time set time section forward, calculates ash content of coal and thermal value.Said set time section can be adjusted according to the actual conditions of application scenario.
The method that the utility model provides a kind of ash content of coal and measurement of calorific value system and uses this systematic survey ash content of coal and thermal value; Through before the coal burning equipment entrance and after the outlet of coal burning equipment, dual energy gamma ray transmissive measurement mechanism being set respectively; To measure the attenuation coefficient of coal and coal ash respectively; Attenuation coefficient in conjunction with coal and coal ash calculates ash content of coal and thermal value, has both satisfied the real-time measurement requirement, realizes eliminating the influence of high atomic number to ash content of coal and measurement of calorific value again; The influence that makes the measurement of ash content of coal and thermal value not changed by coal improves accuracy of measurement.The utility model is applicable to coal application places or the equipment that produces coal ash, for example generating plant, heating boiler etc.
Additional aspect of the utility model and advantage part in the following description provide, and part will become obviously from the following description, or recognize through the practice of the utility model.
Description of drawings
Above-mentioned and/or additional aspect of the utility model and advantage obviously with are easily understood becoming the description of embodiment from combining figs, wherein:
Fig. 1 is ash content of coal and the measurement of calorific value system schematic of the utility model embodiment;
Fig. 2 is ash content of coal and the measurement of calorific value method flow diagram of the utility model embodiment.
Embodiment
Describe the embodiment of the utility model below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the utility model, and can not be interpreted as restriction the utility model.
Hereinafter the different structure that provides many various embodiment or example to be used for realizing the utility model disclosed.In order to simplify disclosing of the utility model, hereinafter the parts and the setting of specific examples are described.Certainly, they only are example, and purpose does not lie in restriction the utility model.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and purpose clearly, itself not indicate the relation between various embodiment that discuss of institute and/or the setting.In addition, various specific technology and examples of material that the utility model provides, but those of ordinary skills can recognize the property of can be applicable to of other technologies and/or the use of other materials.In addition; First characteristic of below describing second characteristic it " on " structure can comprise that first and second characteristics form the embodiment of direct contact; Can comprise that also additional features is formed on the embodiment between first and second characteristics, such first and second characteristics possibly not be direct contacts.
Need to prove that in addition, term " first ", " second " only are used to describe purpose, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more a plurality of these characteristics can be shown or impliedly comprised to the characteristic that is limited with " first ", " second " clearly.In addition, in the description of the utility model, except as otherwise noted, the implication of " a plurality of " is two or more.
Fig. 1 is ash content of coal and the measurement of calorific value system schematic of the utility model embodiment.This ash content of coal and measurement of calorific value system comprise two dual energy gamma ray transmissive measurement mechanisms 110 and 120 and calculation element 150.Wherein, dual energy gamma ray transmissive measurement mechanism 110 is arranged on before the coal burning equipment 100 inlet A, is used to measure first attenuation coefficient of unburned coal for the gamma ray of dual energy gamma ray transmissive measurement mechanism; Dual energy gamma ray transmissive measurement mechanism 120 is arranged on after the coal burning equipment 100 outlet B, is used to measure coal ash after the burning for second attenuation coefficient of the gamma ray of dual energy gamma ray transmissive measurement mechanism.Dual energy gamma ray transmissive measurement mechanism 110 is connected with calculation element 150 respectively with 120; First and second attenuation coefficients so that it is recorded transfer to calculation element 150; Calculation element 150 calculates the ash content and/or the thermal value of coal according to first and second attenuation coefficients.Particularly, energy gamma ray transmissive measurement mechanism 110 can be connected with calculation element 150 respectively through cable or radio communication with 120.
Be pointed out that the dual energy gamma ray transmissive measurement mechanism of the utility model embodiment is conventionally known to one of skill in the art, it comprises the gamma ray of two kinds of different-energies, at this its structure function is repeated no more.In addition; Present embodiment is an example with two dual energy gamma ray transmissive measurement mechanisms only; For the situation that has many coal transport tapes to the coal supply of coal burning equipment; Need dual energy gamma ray transmissive measurement mechanism be installed at every coal transport tape, promptly before coal burning equipment 100 inlet A, a plurality of dual energy gamma ray transmissive measurement mechanisms be set.
In the utility model embodiment; Coal burning equipment 100 is boiler, and the inlet A place of boiler 100 is connected with coal transport tape 130, is used for treating that burning coal is delivered to boiler 100; The outlet B place of boiler 100 is connected with coal ash transport tape 140, is used for the coal ash after the burning from boiler 100 outputs.So preferably, dual energy gamma ray transmissive measurement mechanism 110 is arranged on the coal transport tape 130, and dual energy gamma ray transmissive measurement mechanism 120 is arranged on the coal ash transport tape 140.In another embodiment of the utility model; Can the coal ash after the coal ash sample devices is used to gather coal burning be installed in 100 outlets of coal burning equipment; Dual energy gamma ray transmissive measurement mechanism 120 can be arranged on the said coal ash sample devices, to measure second attenuation coefficient.In embodiment of the utility model; Generate coal ash from the position of measuring first attenuation coefficient to the burning back according to coal; And outputed to the system operation time of the position of measuring second attenuation coefficient, the time in corrective delay of said ash content of coal measuring system is set; Calculation element 150 with first attenuation coefficient that records through a corrective delay times prior, calculates ash content of coal and thermal value according to current second attenuation coefficient that records.Through the time in corrective delay of system is set, guarantee that first attenuation coefficient and second attenuation coefficient are to the measurement of same coal heap.Owing to utilize second attenuation coefficient, deduct the part that influenced by the high atomic number element changes of contents in first attenuation coefficient, thereby calculate ash value and heating value accurately.
In another embodiment of the utility model, calculation element 150 is according to current first attenuation coefficient that records, and the mean value of second attenuation coefficient that records in the current time set time section forward, calculates ash content of coal and thermal value.Said set time section can be confirmed and adjustment according to the actual conditions of application scenario.
According to ash content of coal and the measurement of calorific value system of the utility model embodiment, the utility model further proposes the measuring method of a kind of ash content of coal and thermal value, and with reference to Fig. 2, this method may further comprise the steps:
Step S01: before coal gets into coal burning equipment 100 inlet A, measure first attenuation coefficient of the preceding coal of burning for the gamma ray of said measurement mechanism 110 through at least one dual energy gamma ray transmissive measurement mechanism 110;
Step S02: after coal ash is exported said coal burning equipment 100 outlet B, through second attenuation coefficient of the coal ash after at least one dual energy gamma ray transmissive measurement mechanism 120 measurement burning for the gamma ray of said measurement mechanism 120;
Step S03: first attenuation coefficient and second attenuation coefficient are transferred to calculation element 150 respectively, and calculation element 150 calculates the ash content and the thermal value of coal according to first and second attenuation coefficients.Concrete computing method are following:
First attenuation coefficient comprises the attenuation coefficient of two different-energy gamma rays of said dual energy gamma ray to coal; Be made as UL and UH respectively; UL represents the attenuation coefficient of low energy gamma ray to coal, and UH represents the attenuation coefficient of another high-energy gamma ray to coal.If said low energy gamma ray is UmLC to the mass attenuation coefficient of combustible element in the coal, be UmLM to the mass attenuation coefficient of coal Mineral Elements in Jadeite Shellfish.If said high-energy gamma ray is UmHC to the mass attenuation coefficient of combustible element in the coal, be UmHM to the mass attenuation coefficient of coal Mineral Elements in Jadeite Shellfish.If coal mineral content is x, then combustible content is 1-x.Formula below existing:
UL=[(1-x) * UmLC+x*UmLM] * pd formula (1),
UH=[(1-x) * UmHC+x*UmHM] * pd formula (2),
According to physics law, UmHC ≈ UmHM ≈ UH formula (3)
Wherein pd is the mass thickness of tested coal.
Second attenuation coefficient comprises the attenuation coefficient of two different-energy gamma rays to coal ash, is made as VL and VH respectively, and VL represents the attenuation coefficient of low energy gamma ray to coal ash, and VH represents the attenuation coefficient of another high-energy gamma ray to coal ash.If said low energy gamma ray is VmLO to the mass attenuation coefficient of oxygen element in the coal ash, be VmLM to the mass attenuation coefficient of coal ash Mineral Elements in Jadeite Shellfish.If said high-energy gamma ray is VmHO to the mass attenuation coefficient of oxygen element in the coal ash, be VmHM to the mass attenuation coefficient of coal ash Mineral Elements in Jadeite Shellfish.If variable y makes it equal the ratio of oxygen element content and content of mineral substances in the coal ash.Formula below existing:
VL=[y*VmLO+VmLM] * pd/ (1+y) formula (4),
VH=[y*UmHO+VmHM] * pd/ (1+y) formula (5),
According to physics law, VmHO ≈ VmHM ≈ VH ≈ UH formula (6)
Because combustible mainly is a carbon in the coal, carbon is adjacent with the oxygen element atomic number, therefore has
VmLO ≈ UmLC formula (7)
Ash content of coal then equals the coal mineral and is converted into percentage by weight behind the oxide, so ash content
Ad=x* (1+y) * 100 formula (8)
Can derive the ash content computing formula according to as above formula:
Ad=(UL/UH-C)/(VL/VH-C) * 100, C=UmLC/UH wherein, C is approximately constant, can confirm through Theoretical Calculation or on-the-spot control experiment.
Because above-mentioned derivation and physical model exist approximate, the therefore actual formula that uses can increase correction factor, to optimize measurement result.
One of actual ash content computing formula is:
Ad=A1* (UL/UH)/(VL/VH-C1)-B1/ (VL/VH-C1)-D1, wherein Ad is an ash content, A1, B1, D1 are constant, confirm that through on-the-spot control experiment C1 can get the constant that equates with C, also can confirm through on-the-spot control experiment.
Another actual ash content computing formula is:
Ad=A2* (UL/UH-C2)/(VL/VH-C2)+B2, wherein Ad is an ash content, A2, B2, C2 are constant, confirm through on-the-spot control experiment.
Two actual ash content computing formula of using listing above are merely example; Can not be interpreted as limitation to the utility model; Those skilled in the art are according to actual conditions; Ash content correction principle and method above utilizing, the formula that the form of deriving there are differences is also contained in the protection domain of the utility model.
Can learn according to top ash content computing formula; The tested coal ash that measures second attenuation coefficient; Should be that the tested coal that measures first attenuation coefficient produces in theory, could utilize said first and second attenuation coefficient correct calculation ash content of coal and the thermal values like this.Because coal from being transfused to said combustion apparatus, generates coal ash to the burning back and is exported, there is system operation time, if carry out strict ash content correction calculation, carry out the ash content correction calculation with regard to this system operation time of considered.Ash content that calculates like this and thermal value will lag behind a period of time, but still have the production effect of instructing, and have more meaning for analytic combustion energy saving of system efficient.
Another kind of ash content correcting scheme is; Utilize first attenuation coefficient of current measurement, and since the current time, a period of time forward at interval in the mean value of (as 10～30 minutes) said second attenuation coefficient of measuring; Carry out the ash content correction calculation, also can obtain measurement result preferably.This is because in the short time interval; Ature of coal takes place less than the probability of about-face; The mean value that is said second attenuation coefficient can be represented the reality second attenuation coefficient value in the following short period, and littler through the error of second attenuation coefficient after average, and is more favourable to measuring.
The method that the utility model provides a kind of ash content of coal measuring system and uses this systematic survey ash content of coal; Through before the coal burning equipment entrance and after the outlet of coal burning equipment, dual energy gamma ray transmissive measurement mechanism being set respectively; To measure the attenuation coefficient of coal and coal ash respectively; Attenuation coefficient in conjunction with coal and coal ash calculates ash content of coal and/or thermal value, has both satisfied the real-time measurement requirement, has realized eliminating the influence that high atomic number is measured ash content of coal again; Make ash content of coal measure the influence that not changed by coal, improve accuracy of measurement.
In addition; Be pointed out that; Measure the device of coal ash second attenuation coefficient in the above-mentioned measurement mechanism, be installed in after the device of measuring coal first attenuation coefficient, but according to the method for this corrections ash content measurement; The device of measuring coal ash second attenuation coefficient also can be installed in before the device of measuring coal first attenuation coefficient perhaps non-coal burning equipment application scenario.For example the cleans ash of coal washery is measured; A device of measuring coal first attenuation coefficient is installed on the cleaned coal belt conveyor, and the laboratory of coal washery is per hour all to the cleaned coal sampling, to adopt coal sample division and carry out chemical analysis; Therefore can utilize the residue coal sample; It is fired into coal ash, the second attenuation coefficient measurement mechanism is installed in the laboratory, second attenuation coefficient of measuring is used to proofread and correct cleans ash measures.
Although illustrated and described the embodiment of the utility model; Those having ordinary skill in the art will appreciate that: under the situation of principle that does not break away from the utility model and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, the scope of the utility model is limited claim and equivalent thereof.
Claims (7)
1. ash content of coal and measurement of calorific value system is characterized in that, comprising: at least two dual energy gamma ray transmissive measurement mechanisms and calculation element, wherein:
At least one said dual energy gamma ray transmissive measurement mechanism is arranged on before the coal burning equipment entrance, is used to measure first attenuation coefficient of the preceding coal of burning for the gamma ray of said dual energy gamma ray transmissive measurement mechanism;
At least one said dual energy gamma ray transmissive measurement mechanism is arranged on after the outlet of said coal burning equipment, is used to measure coal ash behind the said coal burning for second attenuation coefficient of the gamma ray of said dual energy gamma ray transmissive measurement mechanism;
Said at least two dual energy gamma ray transmissive measurement mechanisms are connected with said calculation element respectively; So that said first and second attenuation coefficients are transferred to said calculation element; Said calculation element calculates the ash content and the thermal value of said coal according to said first and second attenuation coefficients.
2. ash content of coal as claimed in claim 1 and measurement of calorific value system is characterized in that, said at least two dual energy gamma ray transmissive measurement mechanisms are connected with said calculation element respectively through cable or radio communication.
3. ash content of coal as claimed in claim 1 and measurement of calorific value system is characterized in that, said at least one said dual energy gamma ray transmissive measurement mechanism is arranged on the transport tape into said coal burning equipment conveying coal.
4. ash content of coal as claimed in claim 1 and measurement of calorific value system is characterized in that, said at least one said dual energy gamma ray transmissive measurement mechanism is arranged on the coal ash transport tape that links to each other with said coal burning equipment outlet.
5. ash content of coal as claimed in claim 1 and measurement of calorific value system; It is characterized in that; Said at least one said dual energy gamma ray transmissive measurement mechanism is arranged near the coal ash sample devices the outlet of said coal burning equipment, is used to measure said second attenuation coefficient of the coal ash of the said coal burning equipment output that said coal ash sample devices gathers.
6. ash content of coal as claimed in claim 1 and measurement of calorific value system; It is characterized in that; Become coal ash after from the position of measuring said first attenuation coefficient to burning and output to the system operation time of the position of measuring said second attenuation coefficient according to said coal, the time in corrective delay of said ash content of coal and measurement of calorific value system is set; Said calculation element with said first attenuation coefficient that records through a said corrective delay times prior, calculates ash content of coal and thermal value according to current said second attenuation coefficient that records.
7. ash content of coal as claimed in claim 1 and measurement of calorific value system; It is characterized in that; Said calculation element is according to current said first attenuation coefficient that records; And the mean value of said second attenuation coefficient that records in the current time set time section forward, calculate ash content of coal and thermal value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507613A (en) * | 2011-10-19 | 2012-06-20 | 清华大学 | Measuring system of ash content and heat productivity of coal, and measuring method thereof |
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| CN102507613A (en) * | 2011-10-19 | 2012-06-20 | 清华大学 | Measuring system of ash content and heat productivity of coal, and measuring method thereof |
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