CN107451408B - Coal-fired heating value data checking method - Google Patents

Abstract

The invention discloses a method for checking coal-fired calorific value data, which comprises the steps of carrying out parallel sample analysis on a target coal sample of a target ore point to obtain dry base ash and dry base high-order calorific value, obtaining the change rate and the average change rate of the dry base high-order calorific value along with the dry base ash, carrying out parallel sample analysis on the target coal sample corresponding to the intermediate value of the dry base ash and the dry base high-order calorific value again in different instruments to obtain related data in a formula, substituting the dry base ash of the target coal sample to be checked to obtain the dry base high-order calorific value, comparing the dry base high-order calorific value with the dry base high-order calorific value obtained by testing to determine whether the testing data needs to be rechecked.

Description

Coal-fired heating value data checking method

Technical Field

The invention relates to the field of data checking and analyzing, in particular to a coal-fired heating value data checking method.

Background

At present, the method for examining the calorific value of the coal is more, and the method for examining the calorific value of the coal related to industrial analysis is mostly an empirical formula method. The calorific values calculated by an empirical formula method are respectively an air-dry-based high-order calorific value and a dry ashless-based high-order calorific value, and the method has poor inspection precision (more than 1000J/g) and is not suitable for the requirements of the current coal market.

In order to avoid settlement disputes between supply and demand parties, the credibility of enterprises is improved, and the settlement data needs to be ensured to be very reliable. However, the calorific value data comes from experiments, so that various errors cannot be avoided, and some errors cannot be found in time, so that the calorific value data deviates from the true value, and economic loss is brought to enterprises.

In summary, how to effectively solve the problems of poor stability, incapability of meeting market requirements and the like during the examination of the calorific value of the coal is a problem which needs to be solved urgently by technical personnel in the field at present.

Disclosure of Invention

In view of the above, the present invention aims to provide a coal-fired calorific value data checking method to solve the problems of poor stability and incapability of meeting market requirements during coal-fired calorific value examination.

In order to achieve the purpose, the invention provides the following technical scheme:

a coal-fired heating value data checking method comprises the following steps:

carrying out parallel sample analysis on a plurality of target coal samples of a target ore point in a first ash analyzer and a first calorimeter to obtain a plurality of pairs of dry base ash A_dAnd a dry base high calorific value Q_gr,d；

According to adjacent said dry base ash A_dA rule that the difference is not less than a first threshold value, for a plurality of pairs of the dry base ashes A_dAnd the high calorific value Q of the drying group_gr,dSorting is carried out;

calculating the dry basis ash A_dAnd a dry base high calorific value Q corresponding thereto_gr,dRate of change X of_iAnd an average rate of change X;

when the change rate X is_iWhen the absolute value of the range difference with the average change rate X is larger than a second threshold value, the change rate X is determined_iCorresponding dry base ash A_dAnd a dry base high calorific value Q_gr,dDiscarding and repeatedly calculating the average change rate X;

for a plurality of pairs of the dry base ash A_dAnd the high calorific value Q of the drying group_gr,dThe coal sample corresponding to the intermediate value of (1) isPerforming parallel sample analysis in a second ash analyzer and a second calorimeter to obtain approved dry base ash and approved second dry base high calorific value, wherein when the dry base ash A in the first ash analyzer is_dAnd the approved dry base ash and the dry base ash A are added when the difference value between the approved dry base ash and the approved dry base ash is not more than a third threshold value_dTaking the average value to obtain (A)_d)_{It is known that}；

When the dry base high heating value Q in the first calorimeter_gr,dWhen the difference value between the approved second drying base high heating value and the approved second drying base high heating value is not more than a fourth threshold value, the approved second drying base high heating value and the drying base high heating value Q are used_gr,dTaking the average to obtain (Q)_gr,d)_{It is known that}；

According to formula Q_gr,d＝(Q_gr,d)_{It is known that}-X(A_d-(A_d)_{It is known that}) Dry base ash A of a target coal sample to be examined_dSubstituting to obtain the dry-based high-level calorific value Q of the target coal sample to be checked_gr,d；

And comparing the high heating value of the drying base of the target coal sample to be checked with the high heating value of the drying base obtained by testing, and determining whether the data needs to be rechecked.

Preferably, the comparing the high calorific value of the dry basis of the target coal sample to be examined with the high calorific value of the dry basis obtained by the assay to determine whether the data needs to be reviewed includes:

and carrying out subtraction operation on the dry basis high-order heating value of the target coal sample to be checked and the dry basis high-order heating value obtained by testing, judging whether the absolute value of the difference value is more than or equal to 360J/g, and if so, carrying out sample re-testing on the target coal sample.

Preferably, the method further comprises:

and judging whether the re-testing data of the target coal sample is consistent with the testing data result of the original target coal sample, and if not, determining that the coal quality of the target coal sample is changed.

Preferably, the target coal sample of the target ore point is in the first ash contentAnalyzing the parallel samples in the instrument and the first calorimeter to obtain a plurality of pairs of dry base ash A_dAnd a dry base high calorific value Q_gr,dPreviously, the method further comprises:

and classifying the target coal sample according to the conveying time and the ore points.

Preferably, the target coal sample of the target ore point is subjected to parallel sample analysis in a first ash analyzer and a first calorimeter to obtain a plurality of pairs of dry base ash A_dAnd a dry base high calorific value Q_gr,dPreviously, comprising:

measuring the calorific value of the benzoic acid for multiple times in a first calorimeter to obtain multiple benzoic acid calorific values;

averaging the plurality of benzoic acid heating values;

and judging whether the difference value between the average value and the standard heat value is not more than 50J/g, if so, the first calorimeter accords with the check standard.

According to the method for checking the coal-fired calorific value data, the target coal samples of the target ore points are subjected to parallel sample analysis to obtain the dry base ash content and the dry base high calorific value, the change rate and the average change rate of the dry base high calorific value and the dry base ash content are obtained, and the target coal samples corresponding to the intermediate values of the dry base ash content and the dry base high calorific value are subjected to parallel sample analysis again in different instruments to ensure the data accuracy.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic flow structure diagram of a coal-fired calorific value data checking method.

Detailed Description

The embodiment of the invention discloses a method for checking coal calorific value data, which aims to solve the problems that the coal calorific value is poor in stability and cannot meet market requirements during examination, and the like.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In a specific embodiment, the method for checking the coal-fired calorific value data provided by the invention comprises the following steps:

s11: carrying out parallel sample analysis on a plurality of target coal samples of a target ore point in a first ash analyzer and a first calorimeter to obtain a plurality of pairs of dry base ash A_dAnd a dry base high calorific value Q_gr,d；

Generally, before the instrument is used, the first ash analyzer and the first calorimeter need to be calibrated and checked, and the analysis coal sample needs to be less than 0.2mm to ensure the uniformity of the coal sample, otherwise, the out-of-tolerance phenomenon is easy to occur, and the representativeness is not good. Generally, at least 20 pairs of data are used, and can be set according to actual needs.

S12: according to adjacent dry base ash A_dDifference is not less than first threshold, for multiple pairs of dry base ash A_dAnd a dry base high calorific value Q_gr,dSorting is carried out;

according to the conditions: adjacent dry base ash A_dSorting the high heating values of the drying bases when the difference is not less than a first threshold, wherein the first threshold is set according to national standards, for example, in one embodiment, the first threshold is 0.5%, when the adjacent drying base ashes A are adjacent to each other_dWhen the difference is less than 0.5%, the group of dry base ashes A is added_dAnd a dry base high calorific value Q_gr,dAnd (5) discarding.

S13: according to the formula

And formula

Calculated dry basis ash A_dAnd a dry base high calorific value Q corresponding thereto_gr,dRate of change X of_iAnd an average rate of change X;

s14: when rate of change X_iWhen the absolute value of the range difference with the average change rate X is larger than a second threshold value, the change rate X is determined_iCorresponding dry base ash A_dAnd a dry base high calorific value Q_gr,dDiscarding, and repeatedly calculating the average change rate X;

for a plurality of pairs of well-ordered drying base high-order heating values A_dAnd dry base ash Q corresponding thereto_gr,dCalculating to obtain a heat value Q_gr,dWith A_dAnd calculating Q_gr,dWith A_dAverage rate of change X when X_iWhen the absolute value of the range difference between X and X is more than 120J/g, the set of change rates X_iCorresponding dry base ash A_dAnd a dry base high calorific value Q_gr,dAbandoning and recalculating to ensure the accuracy of the average change rate X.

S15: for pairs of dry base ashes A_dAnd a dry base high calorific value Q_gr,dThe coal sample corresponding to the intermediate value is subjected to parallel sample analysis in a second ash analyzer and a second calorimeter to obtain approved dry base ash and approved second dry base high-level calorific value, and when the dry base ash A in the first ash analyzer is used_dIf the difference from the approved dry base ash is not greater than a third threshold value, the approved dry base ash and the approved dry base ash A are added_dTaking the average value to obtain (A)_d)_{It is known that}；

S16: when the dry base in the first calorimeter generates high heat quantity Q_gr,dWhen the difference value between the approved second drying base high heating value and the approved second drying base high heating value is not more than the fourth threshold value, the approved second drying base high heating value and the drying base high heating value Q are used_gr,dTaking the average to obtain (Q)_gr,d)_{It is known that}；

In order to prevent the influence of errors caused by incorrect calibration of the instrument, a plurality of pairs A are used_dAnd Q_gr,dTaking the intermediate value, and adding A of the intermediate value_dAnd Q_gr,dAnd (3) putting the corresponding coal sample in other ash content meters and calorimeters for parallel sample analysis, and taking an average value of analysis results of several times. In other embodiments, the repeated verification of the third ash meter and the third calorimeter may be repeated, multiple times of verification are performed to ensure the accuracy of the data, and the data may be averaged. Obtaining the high-order calorific value of the approved dry base ash and the approved second dry base, taking at least two groups of data which are not out of tolerance as accurate data of the coal sample, or respectively averaging the data to obtain (A)_d)_{It is known that}And (Q)_gr,d)_{It is known that}。

S17: according to formula Q_gr,d＝(Q_gr,d)_{It is known that}-X(A_d-(A_d)_{It is known that}) Dry base ash A of a target coal sample to be examined_dSubstituting to obtain the dry-based high-level calorific value Q of the target coal sample to be checked_gr,d；

S18: and comparing the high heating value of the drying base of the target coal sample to be checked with the high heating value of the drying base obtained by the test to determine whether the test data needs to be rechecked.

Specifically, the method for determining whether the chemical examination data needs to be reexamined by comparing the high calorific value of the dry basis of the target coal sample to be examined with the high calorific value of the dry basis obtained by chemical examination comprises the following steps:

and carrying out subtraction operation on the dry basis high-order heating value of the target coal sample to be checked and the dry basis high-order heating value obtained by testing, judging whether the absolute value of the difference value is more than or equal to 360J/g, and if so, carrying out sample re-testing on the target coal sample.

The data is the difference value when the difference value between the target coal sample dry base ash and the reference coal sample dry base ash is not more than +/-10%, and of course, in other embodiments, the data can be set according to the accuracy requirement, and the data are within the protection scope of the invention. If yes, the air drying base moisture M in the target coal sample data is considered_adAir-dried base ash A_adAir drying base cartridge heating value Q_b,adOne data in the coal sample is large in error, and the target coal sample needs to be subjected to sample review.

Further, the method further comprises:

and judging whether the re-testing data of the target coal sample is consistent with the testing data result of the original target coal sample, and if not, determining that the coal quality of the target coal sample is changed.

Namely, whether the repeatability and the reproducibility exceed those specified by the national standard is determined, whether other errors are introduced in the testing process exists, if so, the coal quality of the target coal sample is considered to have changed, and then the correct testing result is determined again.

In one embodiment, a target coal sample of a target ore site is subjected to parallel sample analysis in a first ash analyzer and a first calorimeter to obtain a plurality of pairs of dry base ashes A_dAnd a dry base high calorific value Q_gr,dPreviously, the method further comprises:

and classifying the target coal sample according to the conveying time and the ore points. And classifying the target coal samples according to the batch, the time of entering the plant and the source of the coal sample mining points, and performing parallel sample analysis on the coal samples with the same conditions as the target coal samples to prevent larger errors in the checking process.

Specifically, a target coal sample of a target ore point is subjected to parallel sample analysis in a first ash analyzer and a first calorimeter to obtain a plurality of pairs of dry base ash A_dAnd a dry base high calorific value Q_gr,dPreviously, comprising:

measuring the calorific value of the benzoic acid for multiple times in a first calorimeter to obtain multiple benzoic acid calorific values;

averaging a plurality of benzoic acid heat values;

and judging whether the difference value between the average value and the standard heat value is not more than 50J/g, if so, conforming the first calorimeter to the checking standard.

The first calorimeter is calibrated, and the calorific value of the benzoic acid can be measured five times generally, and the measurement times can be selected automatically according to needs. In other embodiments, the test can be performed by using standard coal, the difference between the two calorific value test results of the parallel samples and the standard value is in an uncertain range, and when the difference between the newly calibrated heat capacity and the previous heat capacity is not more than 0.25%, the calorimetric system is not considered to have significant change.

In the effective range of heat capacity, all the instruments are used to make the same coal sample regularly or irregularly, and the system error of the instruments is eliminated. If the repeatability does not exceed 120J/g, no occasional error is considered. The calibration and calibration is performed before the other calorimeter, such as the second calorimeter, is used.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. A coal-fired heating value data checking method is characterized by comprising the following steps:

carrying out parallel sample analysis on a plurality of target coal samples of a target ore point in a first ash analyzer and a first calorimeter to obtain a plurality of pairs of dry base ash A_dAnd a dry base high calorific value Q_gr,d；

According to adjacent said dry base ash A_dA rule that the difference is not less than a first threshold value, for a plurality of pairs of the dry base ashes A_dAnd the high calorific value Q of the drying group_gr,dSorting is carried out;

calculating the dry basis ash A_dAnd a dry base high calorific value Q corresponding thereto_gr,dRate of change X of_iAnd an average rate of change X;

when the change rate X is_iWhen the absolute value of the range difference with the average change rate X is larger than a second threshold value, the change rate X is determined_iCorresponding stemDry base ash A_dAnd a dry base high calorific value Q_gr,dDiscarding and repeatedly calculating the average change rate X;

for a plurality of pairs of the dry base ash A_dAnd the high calorific value Q of the drying group_gr,dThe coal sample corresponding to the intermediate value is subjected to parallel sample analysis in a second ash analyzer and a second calorimeter to obtain approved dry base ash and approved second dry base high calorific value, and when the dry base ash A in the first ash analyzer is used, the dry base ash A is subjected to parallel sample analysis in the second ash analyzer and the second calorimeter_dWhen the difference value between the approved dry base ash content and the approved dry base ash content is not more than a third threshold value, the approved dry base ash content and the dry base ash content A corresponding to the coal sample corresponding to the intermediate value are used_dTaking the average value to obtain (A)_d)_{It is known that}；

When the dry base high heating value Q in the first calorimeter_gr,dWhen the difference value between the approved second drying base high heating value and the approved second drying base high heating value is not more than a fourth threshold value, the drying base high heating value Q corresponding to the coal sample corresponding to the approved second drying base high heating value and the intermediate value is used_gr,dTaking the average to obtain (Q)_gr,d)_{It is known that}；

According to formula Q_gr,d＝(Q_gr,d)_{It is known that}-X(A_d-(A_d)_{It is known that}) Dry base ash A of a target coal sample to be examined_dSubstituting to obtain the dry-based high-level calorific value Q of the target coal sample to be checked_gr,d；

And comparing the high heating value of the drying base of the target coal sample to be checked with the high heating value of the drying base obtained by the test to determine whether the test data needs to be rechecked.

2. The method according to claim 1, wherein the comparing the dry-based high calorific value of the target coal sample to be examined with the dry-based high calorific value obtained by the assay to determine whether the assay data needs to be reviewed comprises:

and carrying out subtraction operation on the dry basis high-order heating value of the target coal sample to be checked and the dry basis high-order heating value obtained by testing, judging whether the absolute value of the difference value is more than or equal to 360J/g, and if so, carrying out sample re-testing on the target coal sample.

3. The method of claim 2, further comprising:

and judging whether the re-testing data of the target coal sample is consistent with the testing data result of the original target coal sample, and if not, determining that the coal quality of the target coal sample is changed.

4. The method according to claim 3, characterized in that the target coal sample of the target ore point is subjected to parallel sample analysis in the first ash analyzer and the first calorimeter to obtain a plurality of pairs of dry base ashes A_dAnd a dry base high calorific value Q_gr,dPreviously, the method further comprises:

and classifying the target coal sample according to the conveying time and the ore points.

5. The method according to claim 4, characterized in that the target coal sample of the target ore point is subjected to parallel sample analysis in the first ash analyzer and the first calorimeter to obtain a plurality of pairs of dry base ashes A_dAnd a dry base high calorific value Q_gr,dPreviously, comprising:

measuring the calorific value of the benzoic acid for multiple times in a first calorimeter to obtain multiple benzoic acid calorific values;

averaging the plurality of benzoic acid heating values;

and judging whether the difference value between the average value and the standard heat value is not more than 50J/g, if so, the first calorimeter accords with the check standard.

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