Method and device for evaluating the effect of coal-fired catalysts used in cement burning systems

Abstract

The present invention relates to the field of catalyst technology, and in particular to a method and device for evaluating the effect of a coal-fired catalyst for a cement burning system. The evaluation method includes: performing a thermogravimetric-differential scanning calorimetry test on a coal-fired catalyst sample to be evaluated to obtain the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample; according to the ignition index value, combustion intensity value, burnout performance value and activation energy value of the coal-fired catalyst sample, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value, the evaluation index value corresponding to the coal-fired catalyst sample is calculated; the catalytic effect of the coal-fired catalyst sample is determined according to the evaluation index value; the larger the evaluation index value corresponding to the coal-fired catalyst sample, the better the catalytic effect of the coal-fired catalyst sample. It can be seen that the evaluation method of the present invention takes into account multiple performance indicators in multiple combustion stages, so that the final evaluation result is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of catalysts, and in particular to a method and a device for evaluating the effect of a coal-fired catalyst used in a cement burning system. Background Art

[0002] Coal is used as a fuel for cement production. The carbon emissions from producing each ton of cement clinker are about 865.5kg, of which about 193kg are emissions from coal consumption for clinker production. Reducing energy consumption and carbon emissions in cement production has always been the goal pursued by the cement industry. Reducing energy consumption and carbon emissions from cement production by reducing coal consumption for clinker production has attracted much attention in recent years. In addition to improving coal combustion technology from a process perspective, the use of coal-fired catalysts has also attracted great attention.

[0003] Coal-fired catalytic technology and products were first used in industrial boiler industries such as thermal power generation and heating. In recent years, the cement industry has carried out a certain scale of industrial application at 3000t / d~5000t / d. The application results show that the use of coal-fired catalysts has a significant effect on coal saving, the stability of clinker production has increased significantly, the strength of cement clinker at all ages has increased to varying degrees, the qualified rate of f~CaO has increased significantly, the burnability of cement raw materials has been greatly improved, and the eutectic point has been reduced by 50~100℃. The flue gas composition at the outlet of the decomposition furnace and the smoke chamber at the end of the kiln has been significantly improved, and the NOx and CO contents have been significantly reduced. The economic and environmental benefits of the application of coal-fired catalysts in the cement industry are significant.

[0004] The combustion reaction of coal includes many very complex physical and chemical reactions. The national standard "Evaluation Method of the Combustion-Assisting Effect of Coal Combustion Aids" calculates the carbon residue difference based on the carbon residue rate of the coal sample before and after the addition of the catalyst, and uses the carbon residue difference as an indicator for evaluating the combustion-assisting effect of the catalyst. Since the entire combustion reaction in the cement burning system is composed of multiple stages, if the carbon residue difference is used as the only evaluation indicator of the combustion-assisting effect of the coal-fired catalyst, the evaluation result is not accurate enough. Therefore, the existing evaluation method is not completely suitable for evaluating the catalytic effect of coal-fired catalysts in cement burning systems. Summary of the invention

[0005] The invention provides a method for evaluating the effect of a coal-fired catalyst used in a cement burning system, which is used to solve the technical problem that the evaluation of the catalytic effect of the coal-fired catalyst in the prior art is not accurate enough.

[0006] In one aspect, the present invention provides a method for evaluating the effect of a coal-fired catalyst for a cement burning system, comprising:

[0007] Conducting a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated to obtain an ignition index value, a combustion intensity value, a burnout index value, and an activation energy value of the coal-fired catalyst sample;

[0008] Calculate the evaluation index value corresponding to the coal-fired catalyst sample according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value;

[0009] The catalytic effect of the coal-fired catalyst sample is determined according to the evaluation index value; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample is, the better the catalytic effect of the coal-fired catalyst sample is.

[0010] According to a method for evaluating the effect of a coal-fired catalyst for a cement burning system provided by the present invention, the weights corresponding to the ignition index value and the burnout index value are both greater than the weights corresponding to the combustion intensity value and the activation energy value, and the weight corresponding to the activation energy value is the smallest.

[0011] According to a method for evaluating the effect of a coal-fired catalyst for a cement burning system provided by the present invention, the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value are 0.3471, 0.1983, 0.3471 and 0.1075 respectively.

[0012] According to a method for evaluating the effect of a coal-fired catalyst for a cement burning system provided by the present invention, the ignition index value, the combustion intensity value, the burnout index value and the activation energy value of the coal-fired catalyst sample are obtained, comprising:

[0013] The ignition index value is calculated by the following formula (1):

[0014]

[0015] In formula (1), D i Indicates the ignition index value, (dw / dt) max Indicates the maximum burning rate, rate, t h represents the maximum burning rate time, t i Indicates the time of ignition;

[0016] The combustion intensity value is calculated by the following formula (2):

[0017] I=H / W (2)

[0018] In formula (2), I represents the combustion intensity value, H represents the distance between the peak tip and the baseline of the heat flow rate curve, and W represents the peak width when H reaches half height twice;

[0019] The burnout index value is calculated by the following formula (3);

[0020]

[0021] In formula (3), Δt 1 / 2 represents the time period corresponding to when the burning rate reaches half of the maximum burning rate, t f Indicates burnout time;

[0022] The activation energy value is obtained by linear fitting the following formula (4):

[0023]

[0024] In formula (4), E represents the activation energy value, a represents the conversion rate, T represents the ambient temperature, β represents the heating rate, A represents the pre-exponential factor, and R represents the universal gas constant.

[0025] On the other hand, the present invention also provides a method for determining a coal-fired catalyst, which is used to determine a target catalyst with the best catalytic effect from a plurality of candidate catalysts, comprising:

[0026] Obtaining the evaluation index value corresponding to each candidate catalyst;

[0027] Determine the catalyst with the largest evaluation index value among the plurality of candidate catalysts as the target catalyst;

[0028] Wherein, obtaining the evaluation index value corresponding to each candidate catalyst includes:

[0029] For each of the plurality of candidate catalysts, the following process is performed:

[0030] Performing a thermogravimetric-differential scanning calorimetry test on the candidate catalyst to obtain an ignition index value, a combustion intensity value, a burnout index value, and an activation energy value of the coal-fired catalyst sample;

[0031] According to the ignition index value, combustion intensity value, burnout index value and activation energy value of the candidate catalyst, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value, the evaluation index value corresponding to the candidate catalyst is calculated.

[0032] A method for determining a coal-fired catalyst according to the present invention further includes:

[0033] After obtaining the ignition index value, combustion intensity value, burnout index value and activation energy value corresponding to each candidate catalyst, the ignition index value, combustion intensity value and burnout index value are determined as positive indicators, and the activation energy value is determined as a negative indicator;

[0034] The positive indicator and the negative indicator are respectively standardized;

[0035] According to the standardized ignition index value, combustion intensity value, burnout index value and activation energy value and the corresponding weights, the evaluation index value corresponding to each candidate catalyst is calculated.

[0036] According to a method for determining a coal-fired catalyst provided by the present invention, the forward index and the reverse index are respectively standardized, including:

[0037] For the same positive indicator of the multiple candidate catalysts, the following formula (5) is used for standardization:

[0038]

[0039] In formula (5), It represents the minimum value of the same positive indicator among multiple candidate catalysts; Indicates the maximum value of the same positive indicator; x ii Represents the value to be standardized, y ij Indicates the value after normalization;

[0040] The reverse indexes of the plurality of candidate catalysts are standardized using the following formula (6):

[0041]

[0042] In formula (6), y ij represents the standardized value, It indicates the maximum value of the same reverse indicator among multiple candidate catalysts. Indicates the minimum value of the same reverse indicator among multiple candidate catalysts; x ij Represents the value to be normalized.

[0043] According to a method for determining a coal-fired catalyst provided by the present invention, the evaluation index value corresponding to the candidate catalyst is calculated according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the candidate catalyst, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value, including:

[0044] The evaluation index value corresponding to the catalyst to be selected is calculated using the following formula (7);

[0045]

[0046] Formula (7), x i represents any one of the ignition index value, combustion intensity value, burnout index value and activation energy value, w iIndicates the weight corresponding to any one of the ignition index value, combustion intensity value, burnout index value and activation energy value, n = 4. On the other hand, the present invention also provides an effect evaluation device for a coal-fired catalyst used in a cement burning system, comprising:

[0047] A testing unit, used for performing a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated, so as to obtain an ignition index value, a combustion intensity value, a burnout index value and an activation energy value of the coal-fired catalyst sample;

[0048] The processing unit is used to calculate the evaluation index value corresponding to the coal-fired catalyst sample according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, as well as the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value.

[0049] The evaluation unit is used to determine the catalytic effect of the coal-fired catalyst sample according to the evaluation index value corresponding to the coal-fired catalyst sample; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample, the better the catalytic effect of the coal-fired catalyst sample.

[0050] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-mentioned methods for evaluating the effect of a coal-fired catalyst for a cement burning system.

[0051] The method for evaluating the effect of a coal-fired catalyst for a cement burning system provided by the present invention first performs a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated to obtain the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample; then, according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value, the evaluation index value corresponding to the coal-fired catalyst sample is calculated; finally, the catalytic effect of the coal-fired catalyst sample is determined according to the evaluation index value; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample, the better the catalytic effect of the coal-fired catalyst sample. It can be seen that the evaluation method of the present invention takes into account multiple performance indicators in multiple combustion stages, so that the final evaluation result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 A schematic flow chart of a method for evaluating the effect of a coal-fired catalyst for a cement burning system provided by an embodiment of the present invention;

[0054] Figure 2 Thermogravimetric-differential scanning calorimetry curve diagram of the combustion process of the coal-fired catalyst sample according to the embodiment of the present invention;

[0055] Figure 3 The thermogravimetric-derivative thermogravimetric curve diagram of the combustion process of the coal-fired catalyst sample according to the embodiment of the present invention;

[0056] Figure 4 A linear fitting diagram related to the activation energy value provided by an embodiment of the present invention;

[0057] Figure 5 A schematic diagram of the structure of a coal-fired catalyst effect evaluation device provided in an embodiment of the present invention;

[0058] Figure 6 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] In order to solve the technical problem that the catalytic effect of coal-fired catalysts is not accurately evaluated by using a single indicator in the prior art, the evaluation method provided by the present invention obtains the ignition index value, combustion intensity value, burnout index value and activation energy value in the coal combustion process after using the coal-fired catalyst according to the characteristics that the combustion of coal in the cement burning system is divided into multiple combustion stages, and then calculates the evaluation index value corresponding to the coal-fired catalyst according to the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value. The evaluation index value obtained in this way is more accurate. Therefore, the catalytic effect of the coal-fired catalyst sample determined according to the evaluation index value is also more accurate.

[0061] At present, a small number of studies use single indicators such as ignition temperature, ignition time, heat release, ignition performance, and burnout time to evaluate the effect of coal-fired catalysts. Evaluation with a single indicator cannot fully reflect the effect of coal-fired catalysts, and the importance of each stage of the combustion reaction to the cement burning system is different. The evaluation of coal-fired catalysts for cement burning systems should comprehensively consider the effects of catalysts on each combustion stage of coal to obtain an objective and relatively comparable comprehensive indicator. Based on the characteristics of coal used in cement burning systems, the present invention proposes to use laboratory thermogravimetry-differential scanning calorimetry (TG-DTG) experiments and use comprehensive indicators to evaluate the catalytic effect of coal-fired catalysts.

[0062] The following specific embodiments will be used to describe in detail the effect evaluation method of the coal-fired catalyst for cement burning system provided by the present invention. It is understood that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0063] Embodiment 1:

[0064] Figure 1 The present invention provides a flow chart of a method for evaluating the effect of a coal-fired catalyst for a cement burning system. The method for evaluating the effect of a coal-fired catalyst can be performed by software and / or hardware devices. For example, the hardware device can be an embedded device, or a personal computer, or a server. For example, see Figure 1 As shown, the method for evaluating the effect of the coal-fired catalyst for cement burning system may include:

[0065] S101. Perform a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated to obtain the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample.

[0066] For example, the test conditions for the thermogravimetric-differential scanning calorimetry test of the coal-fired catalyst sample to be evaluated are: the experimental atmosphere is air atmosphere, the ventilation volume is 50ml / min, the heating rate is 10K / min, and the temperature range is 30-900°C. During the thermogravimetric-differential scanning calorimetry (TG-DSC) test, various parameters related to the fire index value, the combustion intensity value, the burnout index value and the activation energy value are collected in real time.

[0067] For example, during the thermogravimetric-differential scanning calorimetry test, the maximum combustion rate, the time of burning at the maximum combustion rate, the ignition time, the change of the test environment temperature, and the heating rate are collected, and then the ignition index value, the combustion intensity value, the burnout index value and the activation energy value of the coal-fired catalyst sample to be evaluated are obtained based on the obtained parameters and the following method, specifically including:

[0068] The ignition index value is calculated by the following formula (1):

[0069]

[0070] In formula (1), D i Indicates the ignition index value, that is, D i Characterizes ignition performance, (dw / dt) max Indicates the maximum burning rate in % / min, t h Indicates the maximum burning rate time (i.e. the time from the start of the test to the time when the maximum burning rate is reached), in min, t i Indicates the ignition time (i.e. the duration of the entire ignition process), in min.

[0071] The combustion intensity value is calculated by the following formula (2), and the combustion intensity represents the instantaneous heat release intensity or the concentration of heat release;

[0072] I=H / W (2)

[0073] In formula (2), I represents the combustion intensity value, that is, I represents the degree of concentrated heat release, H is the distance between the peak tip and the baseline of the heat flow rate curve, and the unit is mW / mg, and W represents the peak width when H reaches half height twice, that is, W specifically refers to the time period from the first time H reaches 1 / 2H to the second time H reaches 1 / 2H, and the unit is min.

[0074] The burnout index value D is calculated by the following formula (3): f , D f Characterize burnout performance;

[0075]

[0076] Figure 2 is a TG-DSC curve diagram of the combustion process of the coal-fired catalyst sample according to an embodiment of the present invention, Figure 3 This is a TG-DTG (thermogravimetric) curve of the combustion process of the coal-fired catalyst sample of the embodiment of the present invention. Please refer to Figure 2 and Figure 3 , in formula (3), Δt 1 / 2 It represents the time taken for the burning rate to reach half of the maximum burning rate from the minimum burning rate, t f Indicates the burn time.

[0077] The following formula (4) is linearly fitted to obtain the activation energy value. The activation energy value E represents the difficulty of the combustion chemical reaction. The combustion kinetic model is:

[0078]

[0079] In formula (4), a represents the conversion rate, T represents the ambient temperature, β represents the heating rate, A represents the pre-exponential factor, and R represents the universal gas constant. Specifically, Figure 4 ,by right Plot the graph and perform a linear fit on the graph. The slope of the fitting result is The intercept is Thus, the activation energy value E is obtained.

[0080] S102. Calculate the evaluation index value corresponding to the coal-fired catalyst sample according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, as well as the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value.

[0081] Among them, the evaluation indicators should include the various stages of coal macro-combustion to characterize the difficulty of micro-chemical reactions. The indicator weights should be objectively assigned according to the importance of each evaluation indicator to the comprehensive evaluation.

[0082] For example, after a large number of experiments and verifications, the ignition index and the burnout performance index are the most important for the evaluation of the entire combustion process, the combustion intensity value is the second most important for the comprehensive evaluation, and the activation energy value is the least important for the comprehensive evaluation among the four indicators. Therefore, in this embodiment, the weights corresponding to the ignition index value and the burnout index value are the same, and both are greater than the weights corresponding to the combustion intensity value and the activation energy value, and the weight corresponding to the activation energy value is the smallest.

[0083] For example, the weights of the ignition index value, the combustion intensity value, the burnout index value and the activation energy value are 0.3471, 0.1983, 0.3471 and 0.1075 respectively. The weights of these four items are compared relatively to obtain the following Table 1, which shows the weights of the ignition index value, the combustion intensity value, the burnout index value and the activation energy value.

[0084] Table 1: Weight value table

[0085]

[0086] In the above weight value table, 1 represents that the importance of each item in the first column is equal to the corresponding item in the first row, that is, when the four items in the first column and the four items in the first row are compared respectively, their importance is the same; 3 represents that the importance of each item in the first column is stronger than the corresponding item in the first row; 2 represents that the ratio of the importance of each item in the first column to the corresponding item in the first row is between the above two items; 1 / 2 and 1 / 3 represent the reciprocal numbers of the ratios of the importance of each item in the first column to the corresponding items in the first row.

[0087] For example, this embodiment uses a linear weighted comprehensive method to calculate the evaluation index value f(x), that is, xi is any one of the above four indicators, w i is the weight corresponding to any index value, and the linear weighted comprehensive method expression of the comprehensive evaluation model is:

[0088]

[0089] S103. Determine the catalytic effect of the coal-fired catalyst sample according to the evaluation index value; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample is, the better the catalytic effect of the coal-fired catalyst sample is.

[0090] The method for evaluating the effect of the coal-fired catalyst of this embodiment takes into account multiple performance indicators in multiple combustion stages based on the characteristics that the combustion of coal in the cement burning system is divided into multiple combustion stages, so that the final evaluation result is more accurate.

[0091] Embodiment 2:

[0092] The present embodiment provides a method for determining a coal-fired catalyst, which is used to determine a target catalyst with the best catalytic effect from a plurality of candidate catalysts. The method includes: obtaining an evaluation index value corresponding to each candidate catalyst; and determining the catalyst with the largest evaluation index value among the plurality of candidate catalysts as the target catalyst.

[0093] The step of obtaining the evaluation index value corresponding to each candidate catalyst specifically includes: for each of the multiple candidate catalysts, performing the following processing:

[0094] A thermogravimetric-differential scanning calorimetry test is performed on the selected catalyst to obtain the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample; based on the ignition index value, combustion intensity value, burnout index value and activation energy value of the selected catalyst, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value, the evaluation index value corresponding to the selected catalyst is calculated.

[0095] Optionally, after obtaining the ignition index value, combustion intensity value, burnout index value and activation energy value corresponding to each candidate catalyst, the ignition index value, combustion intensity value and burnout index value are first determined as positive indicators, and the activation energy value is determined as a negative indicator. Then, the positive indicators and negative indicators are standardized respectively; finally, according to the standardized ignition index value, combustion intensity value, burnout index value and activation energy value and the corresponding weights, the evaluation index value corresponding to each candidate catalyst is calculated.

[0096] Optionally, the positive indicator and the negative indicator are standardized separately, including:

[0097] For the same positive indicator of multiple candidate catalysts, the following formula (5) is used for standardization:

[0098]

[0099] In formula (5), It represents the minimum value of the same positive indicator among multiple candidate catalysts; Indicates the maximum value of the same positive indicator; x ij Represents the value to be standardized, y ij Indicates the value after normalization.

[0100] For the reverse indicators of multiple candidate catalysts, the following formula (6) is used for standardization:

[0101]

[0102] In formula (6), y ij represents the standardized value, It indicates the maximum value of the same reverse indicator among multiple candidate catalysts. Indicates the minimum value of the same reverse indicator among multiple candidate catalysts; x ij Represents the value to be normalized.

[0103] For example, assuming that there are five catalysts to be selected, when the ignition index values ​​of the five catalysts to be selected are standardized, since the ignition index value is a positive indicator, it is determined to use the above formula (5) to standardize the ignition index value of each of the five catalysts to be selected. is the minimum ignition index value of the five candidate catalysts. is the maximum value of the ignition index values ​​of the five candidate catalysts. It can be understood that when x ij When x is the maximum value among the ignition index values ​​of the five candidate catalysts, the standardized value is 1. ij When it is the minimum value among the ignition index values ​​of the five candidate catalysts, the standardized value is 0. Through the standardization method of this embodiment, the standardized values ​​of all indicators of each candidate catalyst are between 0 and 1, which facilitates the comparison of the catalytic performance of each candidate catalyst.

[0104] Optionally, according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the candidate catalyst, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value, the evaluation index value corresponding to the candidate catalyst is calculated, specifically including:

[0105] The evaluation index value corresponding to the catalyst to be selected is calculated using the following formula (7);

[0106]

[0107] Formula (7), x i represents any one of the ignition index value, combustion intensity value, burnout index value and activation energy value, w i Indicates the weight corresponding to any one of the ignition index value, combustion intensity value, burnout index value and activation energy value, n=4.

[0108] Among them, the method of obtaining the ignition index value, combustion intensity value, burnout index value and activation energy value corresponding to each candidate catalyst in this embodiment is the same as that in the above embodiment, and will not be repeated here.

[0109] It can be seen that by adopting the coal-fired catalyst determination method of this embodiment, the comprehensive catalytic performance of each catalyst can be quantified, thereby quickly determining the catalyst with the best catalytic performance.

[0110] Embodiment three:

[0111] This example uses copper nitrate, potassium nitrate, sodium chloride, potassium permanganate and ferric nitrate to evaluate the catalytic combustion effect of each catalyst. The amount of each catalyst added is 1% of the mass of the coal sample.

[0112] According to the proportion of catalyst added to coal powder, weigh chemical reagents and place them in a beaker. Add a certain amount of ultrapure water to make a solution or suspension. Weigh the corresponding proportion of coal sample and add it. Stir to make it completely soaked. Seal the prepared catalytic coal sample to prevent sample contamination. The content of the solution is 20g coal powder, 0.2g chemical reagents and 15ml ultrapure water.

[0113] After the coal sample loaded with coal-fired catalyst is statically precipitated for 12 hours, it is placed in a 105°C oven for 8 hours to allow it to reach an air-dried state again. The catalytic coal sample that has reached an air-dried state is ground in an agate mortar, passed through a 175-mesh square hole sieve, and stored in a desiccator.

[0114] Under the same test environment, a thermogravimetric-differential scanning calorimetry (TG-DSC) experiment was performed on each coal-fired catalyst sample, and the data were recorded. The experimental conditions were that about 10 mg of catalytic coal sample was taken each time for the experiment, the experimental atmosphere was air atmosphere, the ventilation volume was 50 ml / min, the heating rate was 10 K / min, the temperature range was 30-900 ° C, and the experimental crucible was an alumina crucible.

[0115] After testing, the evaluation index matrix consisting of the ignition index value, combustion intensity value, burnout index value and activation energy value corresponding to multiple coal-fired catalyst samples is obtained as follows:

[0116]

[0117] Among them, the matrix X YM In the figure, the first row is the test sample without any catalyst added, and the second to sixth rows are the test samples with copper nitrate, potassium nitrate, sodium chloride, potassium permanganate and ferric nitrate added. The four columns from left to right represent the ignition index value, combustion intensity value, burnout index value and activation energy value.

[0118] The above evaluation index matrix X is standardized by the above embodiment 1. YM After standardization, the following standardized evaluation index matrix is ​​obtained:

[0119]

[0120] The evaluation index values ​​are:

[0121] U YM =Y YM ×W

[0122] The above standardized evaluation index matrix Y is obtained YM The corresponding evaluation index values ​​are:

[0123] U YM ={0.3182 0.8890 0.8575 0.5817 0.5031 0.3281}

[0124] Among them, from left to right are the evaluation index values ​​corresponding to the samples without additives, copper nitrate, potassium nitrate, sodium chloride, potassium permanganate and ferric nitrate.

[0125] The above evaluation index values ​​are normalized to obtain:

[0126]

[0127] From the above It can be obtained that the catalytic effect of chemical reagents on bituminous coal is:

[0128] 1%Cu(NO3)2>1%KNO3>1%NaCl>1%KMnO4>1%Fe(NO3)3

[0129] It can be seen that among the evaluation indicators of adding 1% copper nitrate, the ignition index (D i ) and activation energy (E) are not optimal, but the catalytic effect of the comprehensive evaluation is the best among the five catalysts. When 1% ferric nitrate is added, the effect of reducing the activation energy (E) is the best, but the catalytic effect of the comprehensive evaluation is the lowest among the five catalysts. It can be seen that the comprehensive evaluation method of this embodiment can more comprehensively reflect the catalytic effect of the coal-fired catalyst compared with the single indicator evaluation.

[0130] Embodiment 4:

[0131] This example uses copper nitrate, sodium chloride, cerium nitrate, iron nitrate and zinc oxide to evaluate the catalytic combustion effect of each catalyst. The amount of each catalyst added is 1% of the mass of the coal sample.

[0132] According to the proportion of catalyst added to coal powder, weigh the chemical reagent and put it in a beaker, add a certain amount of ultrapure water to make a solution or suspension, weigh the corresponding proportion of coal sample and add it, stir to make it completely soaked, and seal the prepared catalytic coal sample to prevent sample contamination. The content of the solution is 20g coal powder, 0.2g chemical reagent and 15ml ultrapure water.

[0133] The coal sample loaded with the coal-fired catalyst is placed in a 105°C oven for 8 hours to allow it to reach an air-dried state again. The air-dried catalytic coal sample is ground in an agate mortar, passed through a 175-mesh square-hole sieve, and stored in a desiccator.

[0134] A thermogravimetric-differential scanning calorimetry (TG-DSC) experiment was carried out on the experimental samples, and the data was recorded. The experimental conditions were as follows: about 10 mg of catalytic coal samples were taken each time, the experimental atmosphere was air atmosphere, the ventilation volume was 50 ml / min, the heating rate was 10 K / min, the temperature range was 30-900 °C, and the experimental crucible was an alumina crucible.

[0135] After testing, the evaluation index matrix consisting of the ignition index value, combustion intensity value, burnout index value and activation energy value corresponding to multiple coal-fired catalyst samples is obtained as follows:

[0136]

[0137] Among them, the matrix X MYM In the figure, the first row is the test sample without any catalyst added, and the second to sixth rows are the test samples with copper nitrate, sodium chloride, cerium nitrate, iron nitrate and zinc oxide added. The four columns from left to right represent the ignition index value, combustion intensity value, burnout index value and activation energy value.

[0138] The above evaluation index matrix X is standardized by the above embodiment 1. WYM After standardization, the following standardized evaluation index matrix is ​​obtained:

[0139]

[0140] The evaluation index values ​​are:

[0141] U WYM =Y WYM ×W

[0142] The above standardized evaluation index matrix Y is obtainedWYM The corresponding evaluation index value is

[0143] U WYM ={0 0.9299 0.8728 0.6679 0.6271 0.3941}

[0144] Among them, from left to right are the evaluation index values ​​corresponding to the samples without additives, copper nitrate, sodium chloride, cerium nitrate, iron nitrate and zinc oxide.

[0145] The above evaluation index values ​​are normalized to obtain:

[0146]

[0147] According to the above The catalytic effect of chemical reagents on anthracite can be obtained as follows:

[0148] 1%Cu(NO3)2>1%NaCl>1%Ce(NO3)3>1%Fe(NO3)3>1%ZnO

[0149] It can be seen that the combustion intensity (I) and activation energy (E) are not the best among the evaluation indicators of the catalyst with 1% copper nitrate, but the comprehensive evaluation of the catalytic effect is the best among the five catalysts. When 1% sodium chloride is added, the effect of reducing the activation energy (E) is the best, and the effect of reducing the burnout index (D f ) has the best improvement effect, but the catalytic effect of the comprehensive evaluation is lower than that of copper nitrate among the five catalysts. It can be seen that the comprehensive evaluation method of this embodiment can more comprehensively reflect the catalytic effect of the coal-fired catalyst compared with the single index evaluation.

[0150] The effect evaluation device of the coal-fired catalyst for cement burning system provided by the present invention is described below. The effect evaluation device of the coal-fired catalyst described below and the effect evaluation method of the coal-fired catalyst for cement burning system described above can be referenced to each other.

[0151] Figure 5 A schematic diagram of the structure of a coal-fired catalyst effect evaluation device provided in an embodiment of the present invention, such as Figure 5 The coal-fired catalyst effect evaluation device 50 comprises:

[0152] The testing unit 501 is used to perform a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated, so as to obtain the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample.

[0153] Processing unit 502 is used to calculate the evaluation index value corresponding to the coal-fired catalyst sample based on the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, as well as the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value.

[0154] The evaluation unit 503 is used to determine the catalytic effect of the coal-fired catalyst sample according to the evaluation index value corresponding to the coal-fired catalyst sample; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample, the better the catalytic effect of the coal-fired catalyst sample.

[0155] Optionally, the testing unit 501 is specifically used for:

[0156] The ignition index value is calculated by the following formula (1):

[0157]

[0158] In formula (1), D i Indicates the ignition index value, (dw / dt) max Indicates the maximum burning rate, rate, t h represents the maximum burning rate time, t i Indicates the time of ignition;

[0159] The combustion intensity value is calculated by the following formula (2):

[0160] I=H / W (2)

[0161] In formula (2), I represents the combustion intensity value, H is the distance between the peak tip and the baseline of the heat flow rate curve, and W represents the peak width when H reaches half height twice.

[0162] The burnout index value is calculated by the following formula (3);

[0163]

[0164] In formula (3), Δt 1 / 2 represents the time period corresponding to when the burning rate reaches half of the maximum burning rate, t f Indicates burnout time;

[0165] The activation energy value is obtained by linear fitting the following formula (4):

[0166]

[0167] In formula (4), E represents the activation energy value, a represents the conversion rate, T represents the ambient temperature, β represents the heating rate, A represents the pre-exponential factor, and R represents the universal gas constant.

[0168] Optionally, the evaluation unit 502 is specifically used to: after obtaining the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, divide the ignition index value, combustion intensity value, burnout index value and activation energy value into positive indicators and reverse indicators; standardize the positive indicators and reverse indicators respectively; and calculate the evaluation index value corresponding to the coal-fired catalyst sample according to the standardized ignition index value, combustion intensity value, burnout index value and activation energy value and the corresponding weights.

[0169] The coal-fired catalyst effect evaluation device 50 provided in an embodiment of the present invention can execute the technical solution of the coal-fired catalyst effect evaluation method in any of the above-mentioned embodiments. Its implementation principle and beneficial effects are similar to the implementation principle and beneficial effects of the coal-fired catalyst effect evaluation method. Please refer to the implementation principle and beneficial effects of the coal-fired catalyst effect evaluation method, and no further details will be given here.

[0170] Figure 6 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 6 As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630 and a communication bus 640, wherein the processor 610, the communication interface 620 and the memory 630 communicate with each other through the communication bus 640. The processor 610 may call the logic instructions in the memory 630 to execute the effect evaluation method of the coal-fired catalyst for the cement burning system, the method comprising: performing a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated to obtain the ignition index value, the combustion intensity value, the burnout index value and the activation energy value of the coal-fired catalyst sample; calculating the evaluation index value corresponding to the coal-fired catalyst sample according to the ignition index value, the combustion intensity value, the burnout index value and the activation energy value of the coal-fired catalyst sample, and the weights corresponding to the ignition index value, the combustion intensity value, the burnout index value and the activation energy value; determining the catalytic effect of the coal-fired catalyst sample according to the evaluation index value; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample, the better the catalytic effect of the coal-fired catalyst sample.

[0171] In addition, the logic instructions in the above-mentioned memory 630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0172] On the other hand, the present invention also provides a computer program product, which includes a computer program, and the computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the effect evaluation method of the coal-fired catalyst for the cement burning system provided by the above-mentioned methods, and the method includes: performing a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated to obtain the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample; calculating the evaluation index value corresponding to the coal-fired catalyst sample according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value; determining the catalytic effect of the coal-fired catalyst sample according to the evaluation index value; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample, the better the catalytic effect of the coal-fired catalyst sample.

[0173] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the effect evaluation method of a coal-fired catalyst for a cement burning system provided by the above-mentioned methods, the method comprising: performing a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated to obtain the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample; calculating the evaluation index value corresponding to the coal-fired catalyst sample according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value; determining the catalytic effect of the coal-fired catalyst sample according to the evaluation index value; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample, the better the catalytic effect of the coal-fired catalyst sample.

[0174] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0175] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the effect of a coal-fired catalyst used in a cement burning system, characterized in that: include: Conducting a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated to obtain an ignition index value, a combustion intensity value, a burnout index value, and an activation energy value of the coal-fired catalyst sample; Calculate the evaluation index value corresponding to the coal-fired catalyst sample according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value; Determine the catalytic effect of the coal-fired catalyst sample according to the evaluation index value; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample is, the better the catalytic effect of the coal-fired catalyst sample is; The weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value are 0.3471, 0.1983, 0.3471 and 0.1075 respectively.

2. The method for evaluating the effect of a coal-fired catalyst for a cement burning system according to claim 1, characterized in that: The weights corresponding to the ignition index value and the burnout index value are both greater than the weights corresponding to the combustion intensity value and the activation energy value, and the weight corresponding to the activation energy value is the smallest.

3. The method for evaluating the effect of a coal-fired catalyst for a cement burning system according to claim 1, characterized in that: The obtaining of the ignition index value, the combustion intensity value, the burnout index value and the activation energy value of the coal-fired catalyst sample comprises: The ignition index value is calculated by the following formula (1): In formula (1), D i Indicates the ignition index value, (dw / dt) mac represents the maximum burning rate, t h represents the maximum burning rate time, ti represents the ignition time; The combustion intensity value is calculated by the following formula (2); I=H / W(2) In formula (2), I represents the combustion intensity value, H represents the distance between the peak tip and the baseline of the heat flow rate curve, and W represents the peak width when H reaches half height twice; The burnout index value is calculated by the following formula (3); In formula (3), Δt 1 / 2 represents the time period corresponding to when the burning rate reaches half of the maximum burning rate, t f Indicates burnout time; The activation energy value is obtained by linear fitting the following formula (4): In formula (4), E represents the activation energy value, a represents the conversion rate, T represents the ambient temperature, β represents the heating rate, A represents the pre-exponential factor, and R represents the universal gas constant.

4. A method for determining a coal-fired catalyst, for determining a target catalyst with the best catalytic effect from a plurality of candidate catalysts, characterized in that: include: Obtaining the evaluation index value corresponding to each candidate catalyst; Determine the catalyst with the largest evaluation index value among the plurality of candidate catalysts as the target catalyst; Wherein, obtaining the evaluation index value corresponding to each candidate catalyst includes: For each of the plurality of candidate catalysts, the following process is performed: A thermogravimetric-differential scanning calorimetry test is performed on the candidate catalyst to obtain the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample; according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the candidate catalyst, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value, the evaluation index value corresponding to the candidate catalyst is calculated; the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value are: 0.3471, 0.1983, 0.3471 and 0.1075, respectively.

5. The method for determining a coal-fired catalyst according to claim 4, characterized in that: Also includes: After obtaining the ignition index value, combustion intensity value, burnout index value and activation energy value corresponding to each candidate catalyst, the ignition index value, combustion intensity value and burnout index value are determined as positive indicators, and the activation energy value is determined as a negative indicator; The positive indicator and the negative indicator are respectively standardized; According to the standardized ignition index value, combustion intensity value, burnout index value and activation energy value and the corresponding weights, the evaluation index value corresponding to each candidate catalyst is calculated.

6. The method for determining a coal-fired catalyst according to claim 5, characterized in that: The step of respectively standardizing the positive indicator and the negative indicator comprises: For the same positive indicator of the multiple candidate catalysts, the following formula (5) is used for standardization: In formula (5), It represents the minimum value of the same positive indicator among multiple candidate catalysts; Indicates the maximum value of the same positive indicator; x ij Represents the value to be standardized, y ij Indicates the value after normalization; The reverse indexes of the plurality of candidate catalysts are standardized using the following formula (6): In formula (6), y ij represents the standardized value, It indicates the maximum value of the same reverse indicator among multiple candidate catalysts. Indicates the minimum value of the same reverse indicator among multiple candidate catalysts; x ij Represents the value to be normalized.

7. The method for determining a coal-fired catalyst according to claim 4, characterized in that: The step of calculating the evaluation index value corresponding to the candidate catalyst according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the candidate catalyst and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value comprises: The evaluation index value corresponding to the catalyst to be selected is calculated using the following formula (7); Formula (7), x i represents any one of the ignition index value, combustion intensity value, burnout index value and activation energy value, w represents the weight corresponding to any one of the ignition index value, combustion intensity value, burnout index value and activation energy value, and n=4.

8. An effect evaluation device for coal-fired catalysts used in cement burning systems, characterized in that: include: A testing unit, used for performing a thermogravimetric-differential scanning calorimetry test on the coal-fired catalyst sample to be evaluated, so as to obtain an ignition index value, a combustion intensity value, a burnout index value and an activation energy value of the coal-fired catalyst sample; A processing unit, for calculating the evaluation index value corresponding to the coal-fired catalyst sample according to the ignition index value, combustion intensity value, burnout index value and activation energy value of the coal-fired catalyst sample, and the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value; the weights corresponding to the ignition index value, combustion intensity value, burnout index value and activation energy value are: 0.3471, 0.1983, 0.3471 and 0.1075 respectively; The evaluation unit is used to determine the catalytic effect of the coal-fired catalyst sample according to the evaluation index value corresponding to the coal-fired catalyst sample; wherein, the larger the evaluation index value corresponding to the coal-fired catalyst sample, the better the catalytic effect of the coal-fired catalyst sample.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for evaluating the effect of a coal-fired catalyst for a cement burning system as claimed in any one of claims 1 to 7 is implemented.

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