Denitration catalyst state online evaluation method and system

Abstract

The invention provides a denitration catalyst state on-line evaluation method and system, and relates to the technical field of catalyst state detection.The method comprises the steps that ammonia gas and oxynitride of target gas are measured according to ammonia nitrogen measuring equipment, and relevance of measured data is analyzed; performing flue gas component monitoring according to section partition sampling devices arranged at an inlet, a middle layer and an outlet of the SCR region, analyzing an independent partition model and relevance, and determining a multi-partition ammonia nitrogen comparison result; evaluating the service life of the catalyst based on the ammonia nitrogen comparison result, and determining the service life change trend and the service life evaluation value of the catalyst; the state of the catalyst is determined according to the life change trend and the life index value, a corresponding replacement plan is made, and the catalytic efficiency of the denitration process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of catalyst state detection, and in particular to a method and system for online evaluation of denitration catalyst state. Background Art

[0002] At present, the ammonia injection system has become a must-have environmental protection facility in thermal power plants. As the core component of the SCR system, the catalyst's health and maintenance costs play an important role in both environmental risk assessment and economic evaluation. The catalyst's health evaluation and operation strategy exploration guidance require the support of the online state maintenance system. Regenerating or replacing the catalyst too early will cause a waste of funds, while replacing or regenerating it too late will not only waste the ammonia remover, but also pose an environmental risk.

[0003] Existing technologies for testing catalysts mainly include: inspection through shutdown; rough assessment through online differential pressure measurement, but neither of these two methods can conduct real-time health assessment of catalyst activity and blockage degree, and long-period interval inspections cannot support optimization of maintenance strategies; rough assessment conclusions cannot be managed in a refined manner, cannot compare the advantages and disadvantages of control behaviors during the operation process, and do not support guiding operation functions.

[0004] Therefore, the present invention provides a method and system for online evaluation of the state of a denitration catalyst. Summary of the invention

[0005] The present invention provides a method and system for online evaluation of the state of a denitrification catalyst, which is used to facilitate the reasonable detection of data of different partitions in the denitrification process through an ammonia nitrogen measuring device and a sampling device, and to determine the state and replacement plan by performing correlation analysis and life evaluation, thereby ensuring the efficient operation of the denitrification process.

[0006] The present invention provides a method for online evaluation of denitration catalyst status, comprising:

[0007] Step 1: Measure ammonia and nitrogen oxides in the target gas using an ammonia nitrogen measuring device, and analyze the correlation of the measured data;

[0008] Step 2: Monitor the flue gas composition according to the cross-sectional partition sampling devices arranged at the inlet, middle layer, and outlet of the SCR area, and analyze the independent partition model and the correlation to determine the multi-partition ammonia nitrogen comparison result;

[0009] Step 3: Evaluate the life of the catalyst based on the ammonia nitrogen ratio result to determine the life change trend and life evaluation value of the catalyst;

[0010] Step 4: Determine the state of the catalyst according to the life change trend and the life index value, and formulate a corresponding replacement plan.

[0011] Preferably, the target gas is measured for ammonia and nitrogen oxides using an ammonia nitrogen measuring device, and the correlation of the measured data is analyzed, including:

[0012] Continuous measurement of ammonia and nitrogen oxides at the target gas at the zone inlet and zone outlet based on ammonia nitrogen measuring equipment;

[0013] Draw an inlet image and an outlet image according to the continuous measurement results, and determine the changes of ammonia and nitrogen oxides at different measurement times based on the drawn inlet image and outlet image;

[0014] The correlation between ammonia and nitrogen oxides at different measurement times is analyzed according to the changes.

[0015] Preferably, the smoke composition is monitored according to the cross-sectional partition sampling devices arranged at the inlet, middle layer and outlet of the SCR area, and the independent partition model and the correlation are analyzed to determine the multi-partition ammonia nitrogen comparison result, including:

[0016] The smoke composition is monitored by using the cross-sectional sampling devices arranged at the entrance, middle layer and exit of the SCR area to determine the smoke composition of each partition at different measurement times;

[0017] According to the independent partition model, the smoke components of the corresponding partition are analyzed to determine the ammonia nitrogen composition ratio of the same partition at different measurement times;

[0018] Determine the effective coefficient of the ammonia nitrogen composition ratio in the same partition at different measurement times according to the correlation;

[0019] Determine the comparison partition according to the effectiveness coefficient of each partition at different measurement times and the smoke flow order of different partitions;

[0020] The ammonia nitrogen composition ratios of the comparison partitions are compared to determine the ammonia nitrogen comparison results of multiple partitions.

[0021] Preferably, the catalyst life is evaluated based on the ammonia nitrogen ratio result to determine the catalyst life change trend and life evaluation value, including:

[0022] Obtaining the ammonia nitrogen comparison result of the designated comparison area corresponding to the same measurement time, and calculating the first catalytic value according to the evaluation index matching the designated comparison area;

[0023]

[0024] Wherein, D1 represents the first catalytic value of the specified comparison area at the same measurement time; n1 represents the number of corresponding evaluation indicators; n2 represents the number of the specified comparison area at the same measurement time; y i1,i2+1 represents the catalyst usage value after ammonia nitrogen standardization based on the i2+1th region of the i1th evaluation index at the same measurement time; y i1,i2 represents the catalyst usage value after ammonia nitrogen standardization based on the i2th region of the i1th evaluation index at the same measurement time; Δy i1,i2 represents the catalytic standard quantity of the i2th region based on the i1th evaluation index at the same measurement time; (Δy i1,i2 ) ave represents all Δy based on the i1th evaluation index at the same measurement time i1,i2 The average amount of y i1,n2 represents the catalyst usage value after ammonia nitrogen standardization based on the n2th region of the i1th evaluation index at the same measurement time; y i1,1 It represents the catalyst usage value after ammonia nitrogen standardization based on the first area of ​​the i1th evaluation index at the same measurement time, and the specified comparison partitions are sorted in the order of catalysis, that is: y i1,i2+1 ≥y i1,i2 ;

[0025] Determine the influence coefficient of the corresponding partition according to the space coefficient of each partition in the corresponding specified comparison partition and the environmental coefficient at the corresponding measurement time;

[0026]

[0027] Among them, Y1 i2 represents the influence coefficient of the i2th partition; f1 i2 represents the actual sufficient catalytic coefficient of the i2th partition; f2 i2 represents the set sufficient catalytic coefficient of the i2th partition; Indicates that the i2th partition is based on f2 i2 The spatial coefficient of Indicates that the i2th partition is based on f2 i2 Environmental factor; represents the spatial weight of the i2th partition; represents the environmental weight of the i2th partition; σ1f2 i2 2 represents the variance of the spatial coefficients of all remaining partitions except the i2th partition in the corresponding specified comparison partition; σ2f2 i2 2 Indicates that the variance of all remaining partitions in the comparison partition except the i2th partition based on the environmental coefficient should be specified; min indicates the minimum value symbol;

[0028] Optimizing the first catalytic value based on all influence coefficients involved in the corresponding designated comparison partition at the same measurement time to obtain a second catalytic value D2;

[0029]

[0030] Among them, (Y1 i2 ) min Indicates all Y1 i2 The minimum value in ;

[0031] Determine the life evaluation value of the catalyst based on the second catalytic values ​​of all corresponding designated comparison partitions at the same measurement time;

[0032] Based on all the lifetime evaluation values, the lifetime variation trend of the catalyst is determined.

[0033] Preferably, the state of the catalyst is determined according to the life variation trend and the life evaluation value, and a corresponding replacement plan is formulated, including:

[0034] Comparing the lifetime variation trend with a historical variation trend set under the same measurement length to make a preliminary judgment on the state of the catalyst;

[0035] When in normal operating conditions, routine corrections are made to the life assessment values;

[0036] When in abnormal operating conditions, the flue gas temperature is introduced to correct the life assessment value;

[0037] A secondary judgment is made on the state of the catalyst according to the corrected life evaluation value;

[0038] Based on the preliminary judgment results and the secondary judgment results, the final state of the catalyst is determined, and a corresponding replacement plan is formulated based on the final state of the catalyst.

[0039] Preferably, determining the life variation trend of the catalyst according to all life evaluation values ​​includes:

[0040] Determine the minimum vector, current actual vector, and maximum vector under the same specified comparison partition;

[0041] According to the minimum vector, the current actual vector and the maximum vector, a comparison matrix of the same specified comparison partition is constructed, wherein the rows of the comparison matrix are the catalytic values ​​of different partitions at the same measurement time, and the columns of the comparison matrix are the catalytic values ​​of the same partition at that time of different measurement columns;

[0042] Analyze the comparison matrix, determine the effective value and regularity factor at each measurement moment, and draw a catalytic life curve corresponding to the specified comparison partition;

[0043] All catalytic life curves are fused according to the catalytic processes of all partitions involved in denitrification catalysis to obtain life change curves, which are input into the life analysis model to obtain the life change trend.

[0044] Preferably, determining the minimum vector, the current actual vector, and the maximum vector under the same specified comparison partition includes:

[0045] According to the preset catalytic error corresponding to the designated comparison partition in the denitration catalytic process and the influencing catalytic error based on different measurement moments, the corresponding life assessment value is adjusted downward or upward;

[0046] According to the downward adjustment results, the minimum vector corresponding to the specified contrast partition is constructed;

[0047] According to the upward adjustment results, the maximum vector corresponding to the specified nose drop partition is constructed;

[0048] The current actual vector is constructed by the life assessment value of the corresponding specified comparison partition at different measurement times.

[0049] The present invention provides a denitration catalyst state online evaluation system, comprising:

[0050] Correlation analysis module: measures ammonia and nitrogen oxides in the target gas according to the ammonia nitrogen measuring equipment, and analyzes the correlation of the measured data;

[0051] Partition comparison module: monitor the flue gas composition according to the cross-sectional partition sampling devices arranged at the entrance, middle layer and exit of the SCR area, analyze the independent partition model and the correlation, and determine the multi-partition ammonia nitrogen comparison results;

[0052] Life evaluation module: based on the ammonia nitrogen comparison result, the life evaluation of the catalyst is performed to determine the life change trend and life index value of the catalyst;

[0053] Status analysis module: determines the status of the catalyst according to the life change trend and life index value, and formulates a corresponding replacement plan.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] Ammonia nitrogen measuring equipment and sampling devices facilitate the reasonable detection of data in different partitions during the denitrification process, and through correlation analysis and life assessment, the status and replacement plan are determined to ensure the efficient operation of the denitrification process.

[0056] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0057] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0059] Figure 1 This is a flow chart of a method for online evaluation of denitration catalyst status in an embodiment of the present invention;

[0060] Figure 2 It is a structural diagram of a denitration catalyst status online evaluation system in an embodiment of the present invention. DETAILED DESCRIPTION

[0061] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0062] The embodiment of the present invention provides a method for online evaluation of denitration catalyst status, such as Figure 1 As shown, including:

[0063] Step 1: Measure ammonia and nitrogen oxides in the target gas using an ammonia nitrogen measuring device, and analyze the correlation of the measured data;

[0064] Step 2: Monitor the flue gas composition according to the cross-sectional partition sampling devices arranged at the inlet, middle layer, and outlet of the SCR area, and analyze the independent partition model and the correlation to determine the multi-partition ammonia nitrogen comparison result;

[0065] Step 3: Evaluate the life of the catalyst based on the ammonia nitrogen ratio result to determine the life change trend and life evaluation value of the catalyst;

[0066] Step 4: Determine the state of the catalyst according to the life change trend and the life index value, and formulate a corresponding replacement plan.

[0067] In this embodiment, the nitrogen oxygen measuring equipment refers to an integrated nitrogen oxygen measuring device, including an on-site instrument for nitrogen oxides and an on-site instrument for ammonia. The correlation refers to the use of ammonia-nitrogen co-measuring equipment to ensure that the target sample gases for ammonia and nitrogen oxide measurements are of the same source so that the measured data are consistent in time, thereby allowing data analysis to be correlated. For example, when the ammonia concentration is high and the nitrogen oxide concentration is also high, the correlation indicates that the catalyst performance is poor.

[0068] In this embodiment, the smoke components include: smoke volume, ammonia concentration and nitrogen oxide concentration. The independent partition model is pre-trained based on the smoke components of each partition, and the multi-partition ammonia nitrogen comparison result is determined after comparing the ammonia nitrogen component ratio of the compared partitions.

[0069] In this embodiment, the life assessment is to determine the first catalytic value based on the ammonia nitrogen ratio result and the corresponding evaluation index, optimize the first catalytic value based on the influence coefficient, obtain the second catalytic value, and then conduct an assessment. The life change trend refers to the life change trend of the catalyst, and the life assessment value is determined based on the second catalytic value.

[0070] In this embodiment, the state of the catalyst is preliminarily judged based on the life variation trend, and the life index value is secondarily judged. Finally, based on the preliminary judgment result and the second judgment result, the replacement plan is to replace the catalyst.

[0071] The beneficial effects of the above technical solution are: the ammonia nitrogen measuring equipment and the sampling device facilitate the reasonable detection of data in different partitions during the denitrification process, and the correlation analysis and life assessment are carried out to determine the status and replacement plan, thereby ensuring the efficient operation of the denitrification process.

[0072] The embodiment of the present invention provides an online evaluation method for the state of a denitration catalyst, which measures ammonia and nitrogen oxides in a target gas according to an ammonia nitrogen measuring device and analyzes the correlation of the measured data, including:

[0073] Continuous measurement of ammonia and nitrogen oxides at the target gas at the zone inlet and zone outlet based on ammonia nitrogen measuring equipment;

[0074] Draw an inlet image and an outlet image according to the continuous measurement results, and determine the changes of ammonia and nitrogen oxides at different measurement times based on the drawn inlet image and outlet image;

[0075] The correlation between ammonia and nitrogen oxides at different measurement times is analyzed according to the changes.

[0076] In this embodiment, the inlet image drawing is a time image drawing of the ammonia concentration and the nitrogen oxide concentration at the inlet, and the outlet image drawing is a time image drawing of the ammonia concentration and the nitrogen oxide concentration at the outlet. The change refers to the change of ammonia and nitrogen oxide at the inlet and outlet, for example, an increase or decrease in concentration.

[0077] In this embodiment, the correlation value refers to the positive correlation, negative correlation or no correlation between the concentrations of ammonia and nitrogen oxides at different measurement times.

[0078] The beneficial effect of the above technical solution is: through the ammonia nitrogen measuring equipment, ammonia and nitrogen oxides are continuously measured in the target gas at the regional inlet and the regional outlet, and inlet image drawing and outlet image drawing are performed to determine the changes in ammonia and nitrogen oxides, and then determine the correlation of the data, which lays the foundation for the subsequent determination of the multi-zone ammonia nitrogen comparison results.

[0079] The embodiment of the present invention provides an online evaluation method for the state of a denitration catalyst, which monitors the flue gas composition according to the cross-sectional partition sampling devices arranged at the inlet, middle layer, and outlet of the SCR area, and analyzes the independent partition model and the correlation to determine the multi-partition ammonia nitrogen comparison result, including:

[0080] The smoke composition is monitored by using the cross-sectional sampling devices arranged at the entrance, middle layer and exit of the SCR area to determine the smoke composition of each partition at different measurement times;

[0081] According to the independent partition model, the smoke components of the corresponding partition are analyzed to determine the ammonia nitrogen composition ratio of the same partition at different measurement times;

[0082] Determine the effective coefficient of the ammonia nitrogen composition ratio in the same partition at different measurement times according to the correlation;

[0083] Determine the comparison partition according to the effectiveness coefficient of each partition at different measurement times and the smoke flow order of different partitions;

[0084] The ammonia nitrogen composition ratios of the comparison partitions are compared to determine the ammonia nitrogen comparison results of multiple partitions.

[0085] In this embodiment, the ammonia nitrogen composition ratio refers to the composition ratio of ammonia and nitrogen oxides. For example, ammonia accounts for 10% of the flue gas composition, nitrogen oxides account for 10% of the flue gas composition, and the ammonia nitrogen composition ratio is 1.

[0086] In this embodiment, the effective coefficient is determined according to the correlation and the ammonia nitrogen component ratio based on the correlation component ratio coefficient table. The correlation component ratio coefficient table contains all correlations, ammonia nitrogen component ratios and effective coefficients, mainly for determining the corresponding effective coefficient through correlation and ammonia nitrogen component ratio.

[0087] In this embodiment, the smoke flow order refers to the smoke flowing from the inlet into the middle layer and then out of the outlet. The comparison partition is determined according to the order of the smoke flow order from front to back and the order of the effective coefficient from large to small. For example, according to the smoke flow order, the inlet and the middle layer are comparison partitions, and the middle layer and the inlet are not comparison partitions. The effective coefficient of the inlet is 2, and the effective coefficient of the middle layer is 1. The inlet and the middle layer are comparison partitions, and the middle layer and the inlet are not comparison partitions. If both conditions are met, the inlet and the middle layer are comparison partitions.

[0088] The beneficial effects of the above technical solution are: analyzing the flue gas components of the corresponding partitions through the independent partition model, determining the ammonia nitrogen composition ratio of the same partition at different measurement times, and determining the effective coefficient of the ammonia nitrogen composition ratio based on the correlation, and determining the comparison partitions for ammonia nitrogen composition ratio comparison according to the effective coefficient and the flue gas circulation sequence, and obtaining multi-partition ammonia nitrogen comparison results, which lays the foundation for subsequent life assessment.

[0089] The embodiment of the present invention provides a method for online evaluation of the state of a denitration catalyst, which evaluates the life of the catalyst based on the ammonia nitrogen comparison result, and determines the life change trend and life evaluation value of the catalyst, including:

[0090] Obtaining the ammonia nitrogen comparison result of the designated comparison area corresponding to the same measurement time, and calculating the first catalytic value according to the evaluation index matching the designated comparison area;

[0091]

[0092] Wherein, D1 represents the first catalytic value of the specified comparison area at the same measurement time; n1 represents the number of corresponding evaluation indicators; n2 represents the number of the specified comparison area at the same measurement time; y i1,i2+1 represents the catalyst usage value after ammonia nitrogen standardization based on the i2+1th region of the i1th evaluation index at the same measurement time; y i1,i2 represents the catalyst usage value after ammonia nitrogen standardization based on the i2th region of the i1th evaluation index at the same measurement time; Δy i1,i2 represents the catalytic standard quantity of the i2th region based on the i1th evaluation index at the same measurement time; (Δy i1,i2 ) ave represents all Δy based on the i1th evaluation index at the same measurement time i1,i2 The average amount of y i1,n2 represents the catalyst usage value after ammonia nitrogen standardization based on the n2th region of the i1th evaluation index at the same measurement time; y i1,1It represents the catalyst usage value after ammonia nitrogen standardization based on the first area of ​​the i1th evaluation index at the same measurement time, and the specified comparison partitions are sorted in the order of catalysis, that is: y i1,i2+1 ≥y i1,i2 ;

[0093] Determine the influence coefficient of the corresponding partition according to the space coefficient of each partition in the corresponding specified comparison partition and the environmental coefficient at the corresponding measurement time;

[0094]

[0095] Among them, Y1 i2 represents the influence coefficient of the i2th partition; f1 i2 represents the actual sufficient catalytic coefficient of the i2th partition; f2 i2 represents the set sufficient catalytic coefficient of the i2th partition; Indicates that the i2th partition is based on f2 i2 The spatial coefficient of Indicates that the i2th partition is based on f2 i2 Environmental factor; represents the spatial weight of the i2th partition; represents the environmental weight of the i2th partition; σ1f2 i2 2 represents the variance of the spatial coefficients of all remaining partitions except the i2th partition in the corresponding specified comparison partition; σ2f2 i2 2 Indicates that the variance of all remaining partitions in the comparison partition except the i2th partition based on the environmental coefficient should be specified; min indicates the minimum value symbol;

[0096] Optimizing the first catalytic value based on all influence coefficients involved in the corresponding designated comparison partition at the same measurement time to obtain a second catalytic value D2;

[0097]

[0098] Among them, (Y1 i2 ) min Indicates all Y1 i2 The minimum value in ;

[0099] Determine the life evaluation value of the catalyst based on the second catalytic values ​​of all corresponding designated comparison partitions at the same measurement time;

[0100] Based on all the lifetime evaluation values, the lifetime variation trend of the catalyst is determined.

[0101] In this embodiment, the evaluation index is an index obtained from the index mapping table that matches the partition situation included in the partition combination. For example, the final obtained index is: index 1, index 2 and index 3. At this time, the value of n1 is 3.

[0102] In this embodiment, the purpose of standardization is to ensure the uniformity of dimensions during the calculation process.

[0103] In this embodiment, y i1,i2+1 -y i1,i2 That is the comparison result of ammonia nitrogen between area i2+1 and area i2.

[0104] In this embodiment, the space coefficient refers to the ratio of the reaction space of the corresponding partition to the original space, and the environmental coefficient refers to the environmental factors that affect the reaction in the corresponding partition.

[0105] In this embodiment, the spatial weight of each partition is pre-set.

[0106] In this embodiment, the life assessment value is obtained based on matching the catalyst-assessment mapping table, which is based on matching the second catalyst value under the corresponding specified comparison partition with the table, and the table includes different catalyst values ​​and assessment values ​​matching the catalyst values, and can be directly obtained.

[0107] In this embodiment, the life span variation trend is obtained by analyzing based on a model, and the model is pre-trained.

[0108] The beneficial effects of the above technical solution are: by specifying the ammonia nitrogen comparison results and corresponding evaluation indicators of the comparison partitions, the first catalytic value is calculated, the first catalytic value is optimized based on the influence coefficient, and the second catalytic value is determined. According to all the second catalytic values ​​at the same measurement time, the life evaluation value and the life change trend are determined, which lays the foundation for the subsequent determination of the state of the catalyst.

[0109] The embodiment of the present invention provides a method for online evaluation of the state of a denitration catalyst, which determines the life change trend of the catalyst according to all life evaluation values, including:

[0110] Determine the minimum vector, current actual vector, and maximum vector under the same specified comparison partition;

[0111] According to the minimum vector, the current actual vector and the maximum vector, a comparison matrix of the same specified comparison partition is constructed, wherein the rows of the comparison matrix are the catalytic values ​​of different partitions at the same measurement time, and the columns of the comparison matrix are the catalytic values ​​of the same partition at that time of different measurement columns;

[0112] Analyze the comparison matrix, determine the effective value and regularity factor at each measurement moment, and draw a catalytic life curve corresponding to the specified comparison partition;

[0113] All catalytic life curves are input into the life analysis model according to the catalytic processes of all partitions involved in denitrification catalysis to obtain the life change trend.

[0114] In this embodiment, the comparison

[0115] In this embodiment, the effective value is: the variance among the minimum value, the current actual value and the maximum value at the same measurement time. The smaller the variance, the larger the corresponding effective value. When the variance is 0, the effective value is 1. When the variance is greater than b1 (set threshold), the effective value is 0. The remaining effective values ​​are: (b1-variance) / b1.

[0116] In this embodiment, the regularity factor refers to a curve obtained by plotting the effective value based on the two measurement moments before and after the corresponding effective value to determine whether the curve is a linear fit. If so, the regularity factor is 1. At this time, the evaluation value at the corresponding moment is retained unchanged. If not, the regularity factor is matched from the degree-factor table according to the degree of nonlinearity to screen those with regularity factors greater than 0.5 for retention and delete the rest to draw a catalytic life curve that matches the retained evaluation value.

[0117] In this embodiment, the life span variation trend refers to the variation trend of the catalyst state in the overall denitration process, and the model is obtained by training samples based on different curve conditions, catalytic processes and corresponding life span trends.

[0118] The beneficial effect of the above technical solution is: by determining different vectors for specified comparison partitions to construct a matrix, and then by analyzing the effective value and regularity factor, to draw the catalytic life curve, and based on the model analysis, it is convenient to ensure the reliability of trend acquisition and further improve the catalytic efficiency of the denitrification process.

[0119] The embodiment of the present invention provides a method for online evaluation of the state of a denitration catalyst, which determines the minimum vector, the current actual vector, and the maximum vector under the same specified comparison partition, including:

[0120] According to the preset catalytic error corresponding to the designated comparison partition in the denitration catalytic process and the influencing catalytic error based on different measurement moments, the corresponding life assessment value is adjusted downward or upward;

[0121] According to the downward adjustment results, the minimum vector corresponding to the specified contrast partition is constructed;

[0122] According to the upward adjustment results, the maximum vector corresponding to the specified nose drop partition is constructed;

[0123] The current actual vector is constructed by the life assessment value of the corresponding specified comparison partition at different measurement times.

[0124] In this embodiment, after obtaining the life evaluation value matching the second catalytic value at each measurement moment, the current actual vector (specified comparison partition 1) = [evaluation value at moment 1, evaluation value at moment 2, evaluation value at moment 3 ...] can be obtained;

[0125] In this embodiment, downward adjustment = the evaluation value at the corresponding moment - the evaluation error factor based on the preset catalytic error and the impact on the catalytic error;

[0126] Upward adjustment = evaluation value at the corresponding moment + evaluation error factor based on preset catalytic error and impact catalytic error;

[0127] The minimum vector thus obtained is: [the downward adjustment evaluation value at time 1, the downward adjustment evaluation value at time 2, the downward adjustment evaluation value at time 3...];

[0128] The maximum vector obtained is: [upward adjustment evaluation value at time 1 upward adjustment evaluation value at time 2 upward adjustment evaluation value at time 3 ...].

[0129] In this embodiment, the evaluation error factor is obtained based on matching the error-factor table, which includes different catalytic errors, errors affecting catalysis, etc. The preset catalytic error is constant, and the error affecting catalysis will gradually increase over time and can be directly matched. Both errors are pre-set by experts, and directly matching with the table means matching the existing factors.

[0130] The beneficial effect of the above technical solution is: by adjusting the evaluation value upward or downward, a basis is provided for later construction of a matrix, thereby ensuring the reliability of subsequent evaluations.

[0131] The embodiment of the present invention provides a method for online evaluation of the state of a denitration catalyst, which determines the state of the catalyst according to the life change trend and the life evaluation value, and formulates a corresponding replacement plan, including:

[0132] Comparing the lifetime variation trend with a historical variation trend set under the same measurement length to make a preliminary judgment on the state of the catalyst;

[0133] When in normal operating conditions, routine corrections are made to the life assessment values;

[0134] When in abnormal operating conditions, the flue gas temperature is introduced to correct the life assessment value;

[0135] A secondary judgment is made on the state of the catalyst according to the corrected life evaluation value;

[0136] Based on the preliminary judgment results and the secondary judgment results, the final state of the catalyst is determined, and a corresponding replacement plan is formulated based on the final state of the catalyst.

[0137] In this embodiment, the same measurement length refers to a length that is consistent with the duration formed by the measurement moments.

[0138] In this embodiment, the preliminary judgment is made based on the state of the catalyst corresponding to the similar portion of the lifetime variation trend and the historical variation trend concentration under the same measurement length.

[0139] In this embodiment, normal operating conditions refer to the situation when the ammonia concentration in the outlet zone is low and the nitrogen oxide concentration is high. The rest of the conditions are abnormal operating conditions. The conventional correction is to multiply the life assessment value by a conventional coefficient, for example, 1. The correction for abnormal operating conditions is to introduce the flue gas temperature function to correct the life assessment value.

[0140] In this embodiment, the secondary judgment is determined based on the life evaluation value and the life evaluation value standard range. For example, if the life evaluation value is within the life evaluation value standard range, it is judged that the catalyst is in a healthy state.

[0141] In this embodiment, the final state is determined based on the same parts of the preliminary judgment result and the secondary judgment result.

[0142] The beneficial effects of the above technical solution are: to make a preliminary judgment on the state of the catalyst through the life change trend and the historical change trend, to correct the life assessment value based on different operating conditions, to make a secondary judgment based on the corrected life assessment value, and based on the preliminary judgment result, to determine the final state of the catalyst and formulate a corresponding replacement plan, so as to detect the catalyst state in real time and ensure the high efficiency of the denitrification process.

[0143] The embodiment of the present invention provides a denitration catalyst status online evaluation system, such as Figure 2 As shown, including:

[0144] Correlation analysis module: measures ammonia and nitrogen oxides in the target gas according to the ammonia nitrogen measuring equipment, and analyzes the correlation of the measured data;

[0145] Partition comparison module: monitor the flue gas composition according to the cross-sectional partition sampling devices arranged at the entrance, middle layer and exit of the SCR area, analyze the independent partition model and the correlation, and determine the multi-partition ammonia nitrogen comparison results;

[0146] Life evaluation module: based on the ammonia nitrogen comparison result, the life evaluation of the catalyst is performed to determine the life change trend and life index value of the catalyst;

[0147] Status analysis module: determines the status of the catalyst according to the life change trend and life index value, and formulates a corresponding replacement plan.

[0148] The beneficial effects of the above technical solution are: the ammonia nitrogen measuring equipment and the sampling device facilitate the reasonable detection of data in different partitions during the denitrification process, and the correlation analysis and life assessment are carried out to determine the status and replacement plan, thereby ensuring the efficient operation of the denitrification process.

[0149] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for online evaluation of denitration catalyst status, characterized in that: include: Step 1: Measure ammonia and nitrogen oxides in the target gas using an ammonia nitrogen measuring device, and analyze the correlation of the measured data; Step 2: Monitor the flue gas composition according to the cross-sectional partition sampling devices arranged at the inlet, middle layer, and outlet of the SCR area, and analyze the independent partition model and the correlation to determine the multi-partition ammonia nitrogen comparison result; Step 3: Evaluate the life of the catalyst based on the ammonia nitrogen ratio result to determine the life change trend and life evaluation value of the catalyst; Step 4: Determine the state of the catalyst according to the life change trend and the life index value, and formulate a corresponding replacement plan.

2. A method for online evaluation of denitration catalyst status according to claim 1, characterized in that: The target gas is measured for ammonia and nitrogen oxides using the ammonia nitrogen measuring equipment, and the correlation of the measured data is analyzed, including: Continuous measurement of ammonia and nitrogen oxides at the target gas at the zone inlet and zone outlet based on ammonia nitrogen measuring equipment; Draw an inlet image and an outlet image according to the continuous measurement results, and determine the changes of ammonia and nitrogen oxides at different measurement times based on the drawn inlet image and outlet image; The correlation between ammonia and nitrogen oxides at different measurement times is analyzed according to the changes.

3. A method for online evaluation of denitration catalyst status according to claim 1, characterized in that: The flue gas composition is monitored according to the cross-sectional partition sampling devices arranged at the inlet, middle layer and outlet of the SCR area, and the independent partition model and the above correlation are analyzed to determine the multi-partition ammonia nitrogen comparison results, including: The smoke composition is monitored by using the cross-sectional sampling devices arranged at the entrance, middle layer and exit of the SCR area to determine the smoke composition of each partition at different measurement times; According to the independent partition model, the smoke components of the corresponding partition are analyzed to determine the ammonia nitrogen composition ratio of the same partition at different measurement times; Determine the effective coefficient of the ammonia nitrogen composition ratio in the same partition at different measurement times according to the correlation; Determine the comparison partition according to the effectiveness coefficient of each partition at different measurement times and the smoke flow order of different partitions; The ammonia nitrogen composition ratios of the comparison partitions are compared to determine the ammonia nitrogen comparison results of multiple partitions.

4. A method for online evaluation of denitration catalyst status according to claim 1, characterized in that: Based on the ammonia nitrogen comparison result, the life span of the catalyst is evaluated to determine the life span change trend and life span evaluation value of the catalyst, including: Obtaining the ammonia nitrogen comparison result of the designated comparison area corresponding to the same measurement time, and calculating the first catalytic value according to the evaluation index matching the designated comparison area; Wherein, D1 represents the first catalytic value of the specified comparison area at the same measurement time; n1 represents the number of corresponding evaluation indicators; n2 represents the number of the specified comparison area at the same measurement time; y i1, represents the catalyst usage value after ammonia nitrogen standardization based on the i2+1th region of the i1th evaluation index at the same measurement time; y i1, represents the catalyst usage value after ammonia nitrogen standardization based on the i2th region of the i1th evaluation index at the same measurement time; Δy i1, represents the catalytic standard quantity of the i2th region based on the i1th evaluation index at the same measurement time; (Δy i1, ) ave represents all Δy based on the i1th evaluation index at the same measurement time i1, The average amount of y i1, represents the catalyst usage value after ammonia nitrogen standardization based on the n2th region of the i1th evaluation index at the same measurement time; y i1, It represents the catalyst usage value after ammonia nitrogen standardization based on the first area of ​​the i1th evaluation index at the same measurement time, and the specified comparison partitions are sorted in the order of catalysis, that is: y i1, ≥y i1, ; Determine the influence coefficient of the corresponding partition according to the space coefficient of each partition in the corresponding specified comparison partition and the environmental coefficient at the corresponding measurement time; Among them, Y1 i2 represents the influence coefficient of the i2th partition; f1 i2 represents the actual sufficient catalytic coefficient of the i2th partition; f2 i2 represents the set sufficient catalytic coefficient of the i2th partition; Indicates that the i2th partition is based on f2 i2 The spatial coefficient of Indicates that the i2th partition is based on f2 i2 Environmental factor; represents the spatial weight of the i2th partition; represents the environmental weight of the i2th partition; σ1f2 i2 2 represents the variance of the spatial coefficients of all remaining partitions except the i2th partition in the corresponding specified comparison partition; σ2f2 i2 2 Indicates that the variance of all remaining partitions in the comparison partition except the i2th partition based on the environmental coefficient should be specified; min indicates the minimum value symbol; Optimizing the first catalytic value based on all influence coefficients involved in the corresponding designated comparison partition at the same measurement time to obtain a second catalytic value D2; Among them, (Y1 i2 ) min Indicates all Y1 i2 The minimum value in ; Determine the life evaluation value of the catalyst based on the second catalytic values ​​of all corresponding designated comparison partitions at the same measurement time; Based on all the lifetime evaluation values, the lifetime variation trend of the catalyst is determined.

5. The method for online evaluation of denitration catalyst status according to claim 1, characterized in that: The state of the catalyst is determined according to the life change trend and the life evaluation value, and a corresponding replacement plan is formulated, including: Comparing the lifetime variation trend with a historical variation trend set under the same measurement length to make a preliminary judgment on the state of the catalyst; When in normal operating conditions, routine corrections are made to the life assessment values; When in abnormal operating conditions, the flue gas temperature is introduced to correct the life assessment value; A secondary judgment is made on the state of the catalyst according to the corrected life evaluation value; Based on the preliminary judgment results and the secondary judgment results, the final state of the catalyst is determined, and a corresponding replacement plan is formulated based on the final state of the catalyst.

6. A method for online evaluation of denitration catalyst status according to claim 5, characterized in that: Based on all the life evaluation values, the life change trend of the catalyst is determined, including: Determine the minimum vector, current actual vector, and maximum vector under the same specified comparison partition; According to the minimum vector, the current actual vector and the maximum vector, a comparison matrix of the same specified comparison partition is constructed, wherein the rows of the comparison matrix are the catalytic values ​​of different partitions at the same measurement time, and the columns of the comparison matrix are the catalytic values ​​of the same partition at that time of different measurement columns; Analyze the comparison matrix, determine the effective value and regularity factor at each measurement moment, and draw a catalytic life curve corresponding to the specified comparison partition; All catalytic life curves are fused according to the catalytic processes of all partitions involved in denitrification catalysis to obtain life change curves, which are input into the life analysis model to obtain the life change trend.

7. A method for online evaluation of denitration catalyst status according to claim 6, characterized in that: Determine the minimum vector, current actual vector, and maximum vector under the same specified comparison partition, including: According to the preset catalytic error corresponding to the designated comparison partition in the denitration catalytic process and the influencing catalytic error based on different measurement moments, the corresponding life assessment value is adjusted downward or upward; According to the downward adjustment results, the minimum vector corresponding to the specified contrast partition is constructed; According to the upward adjustment results, the maximum vector corresponding to the specified nose drop partition is constructed; The current actual vector is constructed by the life assessment value of the corresponding specified comparison partition at different measurement times.

8. A denitration catalyst status online evaluation system, characterized in that: include: Correlation analysis module: measures ammonia and nitrogen oxides in the target gas according to the ammonia nitrogen measuring equipment, and analyzes the correlation of the measured data; Partition comparison module: monitor the flue gas composition according to the cross-sectional partition sampling devices arranged at the entrance, middle layer and exit of the SCR area, analyze the independent partition model and the correlation, and determine the multi-partition ammonia nitrogen comparison results; Life evaluation module: based on the ammonia nitrogen comparison result, the life evaluation of the catalyst is performed to determine the life change trend and life index value of the catalyst; Status analysis module: determines the status of the catalyst according to the life change trend and life index value, and formulates a corresponding replacement plan.

Images