CN116857672A - Real-time online monitoring system for combustion efficiency of coal-fired boiler - Google Patents
Real-time online monitoring system for combustion efficiency of coal-fired boiler Download PDFInfo
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- CN116857672A CN116857672A CN202310770213.1A CN202310770213A CN116857672A CN 116857672 A CN116857672 A CN 116857672A CN 202310770213 A CN202310770213 A CN 202310770213A CN 116857672 A CN116857672 A CN 116857672A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 142
- 238000012544 monitoring process Methods 0.000 title claims abstract description 82
- 238000013507 mapping Methods 0.000 claims description 17
- 238000010276 construction Methods 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 9
- 238000012986 modification Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 4
- 239000003245 coal Substances 0.000 description 29
- 230000009286 beneficial effect Effects 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/10—Correlation
Abstract
The invention provides a real-time on-line monitoring system for combustion efficiency of a coal-fired boiler, which comprises the following components: the on-line monitoring module is used for monitoring the current combustion parameters of the coal-fired boiler on line in real time and dividing the current combustion parameters to obtain allowable adjustment parameters and unallowable adjustment parameters; the curve prediction module is used for analyzing a combustion stability trend section of the coal-fired boiler at the current moment based on the allowable adjustment parameter and the non-allowable adjustment parameter; the curve dividing module is used for dividing the combustion stability trend section into sections and determining an efficiency qualified section and an efficiency unqualified section; the parameter determining module is used for locking the initial time point of the efficiency unqualified section and determining the combustion adjustment parameters corresponding to all the efficiency unqualified sections after the initial time point; and the efficiency compensation module is used for carrying out corresponding efficiency compensation treatment on the coal-fired boiler in time based on the combustion adjustment parameters corresponding to all the efficiency unqualified sections when the first future moment of the combustion stability trend section is reached. The combustion efficiency is effectively improved.
Description
Technical Field
The invention relates to the technical field of online monitoring, in particular to a real-time online monitoring system for the combustion efficiency of a coal-fired boiler.
Background
The coal-fired boiler is a boiler using coal as fuel, and is a thermal power device for heating heat medium water or other organic heat carriers (such as heat conducting oil and the like) to a certain temperature (or pressure) through combustion of the coal in a hearth, wherein the heat of the coal burnt by the fuel is converted to generate steam or become hot water, the steam or hot water generated in the heat conversion process is reduced due to incomplete combustion of the coal, and the heat generated by the coal is not completely and effectively converted, and a part of the heat is not consumed, so that the efficiency problem exists.
Therefore, the invention provides a real-time on-line monitoring system for the combustion efficiency of a coal-fired boiler.
Disclosure of Invention
The invention provides a real-time on-line monitoring system for the combustion efficiency of a coal-fired boiler, which is used for determining a combustion stability trend section by on-line monitoring different combustion parameters in the coal-fired boiler, and realizing the efficiency compensation of the coal-fired boiler at the future moment by dividing whether the efficiency is qualified or not so as to ensure the efficient combustion of the coal-fired boiler.
The invention provides a real-time on-line monitoring system for combustion efficiency of a coal-fired boiler, which comprises the following components:
the on-line monitoring module is used for monitoring the current combustion parameters of the coal-fired boiler on line in real time and dividing the current combustion parameters to obtain allowable adjustment parameters and allowable non-adjustable parameters;
the curve prediction module is used for analyzing the combustion stability trend section of the coal-fired boiler at the current moment based on the allowable adjustment parameter and the non-allowable adjustment parameter;
the curve dividing module is used for dividing the combustion stability trend section into sections and determining an efficiency qualified section and an efficiency unqualified section;
the parameter determining module is used for locking the initial time point of the unqualified efficiency section and determining combustion adjustment parameters corresponding to all the unqualified efficiency sections after the initial time point;
and the efficiency compensation module is used for carrying out corresponding efficiency compensation treatment on the coal-fired boiler in time based on the combustion adjustment parameters corresponding to all the efficiency unqualified sections when the first future moment of the combustion stability trend section is reached.
Preferably, the online monitoring module includes:
an index obtaining unit for obtaining an initial index of the coal-fired boiler;
the system comprises a set acquisition unit, a history index database and a control unit, wherein the set acquisition unit is used for respectively setting initial states to corresponding initial indexes according to the current combustion demand of the coal-fired boiler, and acquiring an index setting set of each initial index related to the current combustion demand from the history index database;
the number counting unit is used for counting a first number related to the variable state of the index and a second number related to the non-variable state of the index in the index setting set corresponding to the same initial index;
the state setting unit is used for setting a double state to the corresponding initial index and taking the double state as a secondary state when the ratio of the first number to the second number is in a preset range;
when the ratio of the first number to the second number is not in the preset range, if the ratio of the first number to the second number is larger than the maximum value of the preset range, setting an index variable state to the corresponding initial index and taking the index variable state as a secondary state;
otherwise, setting an index invariable state to the corresponding initial index and taking the index invariable state as a secondary state;
and the parameter determining unit is used for matching a relevant monitoring mode with a corresponding initial index according to the comparison result of the secondary state and the initial state, and carrying out corresponding online monitoring on the coal-fired boiler according to the monitoring mode to obtain the current combustion parameter.
Preferably, the parameter determination unit includes:
a sequence building block for building an index sequence based on a first index whose initial state is consistent with the secondary state and a second index whose initial state is inconsistent with the second state;
a function building block, configured to build a judging function B1 based on the index sequence:
wherein b i1 The value of the i 1-th sequence in the index sequence is 0 when the initial state is completely consistent with the secondary state, 1 when the initial state is completely inconsistent with the secondary state, and 0.5 when the initial state is not completely consistent with the secondary state; oc (oc) i1 Index weight representing an initial index corresponding to the i1 st sequence in the index sequences; n1 represents the total number of sequences existing in the index sequence, and each sequence value corresponds to an initial index; b1 represents a judgment function; n1 (b) i1 =1) represents all b i1 Satisfy b i1 Number of sequences=1; oc (oc) i2 Indicating that b is satisfied i1 Index weight of initial index corresponding to the i2 nd sequence of=1;
a comparison block for whenLess than a first preset value N01, < >>Less than a second preset value N02 and +.>If the initial state is smaller than the third preset value N03, taking the initial state originally set for each initial index as a final state;
otherwise, toAndperforming difference standard conversion to obtain final difference values A1, A2 and A3;
the difference value determining block is used for obtaining a maximum difference value according to max { A1, A2 and A3}, and screening a judgment type corresponding to the maximum difference value from the difference-type database to obtain a modification mode of the completely inconsistent state;
the state modifying block is used for carrying out partial state modification on the related completely inconsistent state according to the modifying mode and obtaining a final state;
the parameter acquisition block is used for determining a monitoring mode consistent with each initial index based on the index-state-monitoring mapping table, and carrying out corresponding online monitoring on the coal-fired boiler according to the monitoring mode to obtain the current combustion parameter.
Preferably, the online monitoring module further comprises:
the label setting unit is used for determining a first parameter corresponding to each index and setting a permission label or a non-permission label to be adjusted to the corresponding first parameter according to the final state of the corresponding index;
and the dividing unit is used for dividing the current combustion parameter into an allowable adjustment parameter and an allowable adjustment parameter according to the label setting result.
Preferably, the curve prediction module includes:
the first stabilizing unit is used for monitoring the first monitoring value which does not allow the parameter to be adjusted from the beginning of the use of the coal-fired boiler to the next moment in real time and determining the corresponding first stability;
the second stabilizing unit is used for monitoring the second monitoring value of the same allowable adjustment parameter from the beginning of the use of the coal-fired boiler to the current moment in real time, determining a corresponding change time point and further determining the second stability of the current moment;
the segment construction unit is used for determining a first stable point at the current moment according to the first stability of all the allowable adjustment parameters and the second stability of all the allowable adjustment parameters based on the current moment, simultaneously determining a left extending point and a right extending point according to the distribution of the variation period and the final variation time point of each allowable adjustment parameter, and constructing and obtaining a combustion stable trend segment.
Preferably, the segment construction unit includes:
a profile construction block for determining a distribution of a fluctuation period and a last fluctuation time point of each allowable adjustment parameter, and constructing a fluctuation profile based on the current time;
an initial segment determining block for locking a third distribution point distributed leftwards from the current moment and a third distribution point distributed rightwards from the current moment according to the fluctuation distribution map to construct an initial combustion segment;
a left-right determining block, configured to obtain a left stable point at each left moment according to a variable set from a third distribution point distributed leftwards to each left moment between the current moment point, and determine a right stable point at each right moment;
and the final segment determining block is used for constructing and obtaining a combustion stability trend segment based on the left stability point, the right stability point and the first stability point.
Preferably, the curve dividing module includes:
the efficiency conversion unit is used for acquiring the combustion efficiency under the stability at each moment in the combustion stability trend section according to the stability-efficiency mapping table;
and the efficiency comparison unit is used for comparing the combustion efficiency at each moment with the preset efficiency to obtain an efficiency qualified section and an efficiency unqualified section.
Preferably, the efficiency compensation module includes:
the dissimilarity determining unit is used for determining the dissimilarity of the combustion parameters corresponding to the next moment and each previous moment in the unqualified efficiency section;
and the efficiency compensation processing is used for determining a first parameter to be compensated at the current moment and a second parameter to be compensated at the first future moment based on the current moment according to all different conditions, so as to realize the efficiency compensation processing of the coal-fired boiler.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a real-time on-line monitoring system for combustion efficiency of a coal-fired boiler in accordance with an embodiment of the present invention;
FIG. 2 is a block diagram of a combustion stability trend segment in an embodiment of the present invention;
FIG. 3 is a variation distribution diagram of an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
The invention provides a real-time on-line monitoring system for combustion efficiency of a coal-fired boiler, as shown in fig. 1, comprising:
the on-line monitoring module is used for monitoring the current combustion parameters of the coal-fired boiler on line in real time and dividing the current combustion parameters to obtain allowable adjustment parameters and allowable non-adjustable parameters;
the curve prediction module is used for analyzing the combustion stability trend section of the coal-fired boiler at the current moment based on the allowable adjustment parameter and the non-allowable adjustment parameter;
the curve dividing module is used for dividing the combustion stability trend section into sections and determining an efficiency qualified section and an efficiency unqualified section;
the parameter determining module is used for locking the initial time point of the unqualified efficiency section and determining combustion adjustment parameters corresponding to all the unqualified efficiency sections after the initial time point;
and the efficiency compensation module is used for carrying out corresponding efficiency compensation treatment on the coal-fired boiler in time based on the combustion adjustment parameters corresponding to all the efficiency unqualified sections when the first future moment of the combustion stability trend section is reached.
In this embodiment, the ratio of the heat actually generated by burning coal to the heat theoretically generated by complete burning is the combustion efficiency, and on this basis, the current combustion amount of the coal-fired boiler needs to be monitored in real time, so as to obtain the combustion coal amount in unit time, the release heat of the combustion coal in unit time, the difference between the theoretical oxygen demand of complete burning of coal and the actual oxygen consumption of burning coal based on the different gas volumes generated by the coal-fired boiler in unit time, the addition amount of coal in unit time, the air intake of a fan and the like, and in the process of dividing the current combustion parameters, the requirements are mainly related to the requirements set in advance for the coal-fired boiler, for example, the requirements are related to the related combustion degree, for example, the combustion sufficiency of 80% needs to be achieved, then the fan of the boiler needs to be controlled to maintain a certain air intake and the sufficient oxygen amount in the coal-fired boiler is ensured, so that the acquisition of the combustion efficiency is performed, and at this time, the air intake and the sufficient oxygen can be taken as the permissible adjustment parameters, and the remaining parameters can be taken as permissible adjustment parameters.
In this embodiment, the combustion stability trend segment is constructed by including a point corresponding to the current time and points corresponding to the left and right sides, and includes stability conditions corresponding to the current time, past time and future time, where each stability point corresponds to one stability point, and the stability point is obtained by comprehensively analyzing allowable adjustment parameters and non-allowable adjustment parameters based on the time, and the specific analysis process is as follows:
the stable point refers to a corresponding stable value, because the combustion stability trend segment is a two-dimensional graph drawn, the abscissa is time, and the total coordinate is the stable value at different time, wherein the stable value is obtained as follows:
stable value = accumulated sum of multiplication of stable value of each allowable adjustment parameter and corresponding parameter weight + accumulated sum of multiplication of stable value of each allowable adjustment parameter and corresponding parameter weight, wherein the stable value of the allowable adjustment parameter is obtained from a demand-mapping table, and the demand-mapping table comprises different coal boilers, various allowable adjustment parameters matched with the set demand of the coal boilers and stable values of the parameters.
The stable value of the allowable adjustment parameter is obtained based on the change condition of the parameter period under the corresponding time according to the allowable adjustment parameter, and is obtained based on a preset parameter-period-time point-value mapping table in the period, wherein the table comprises different allowable adjustment parameters, repeated participation periods of the parameter and stable values of the parameter in different states under different time points in the corresponding period.
For example, the period 1 corresponds to time 1, 2, and 3, the coal usage amount is a1 at time 1, the coal usage amount is a2 at time 2, and the coal usage amount is a3 at time 3, so that the stable value corresponding to the case where the coal usage amount is a1 at time 1 is b1, the stable value corresponding to the case where the coal usage amount is a2 at time 2 is b2, and the stable value corresponding to the case where the coal usage amount is a3 at time 3 is b3, wherein the different usage amounts of coal are different states.
In this embodiment, the stability trend segment is also obtained by curve connection and drawing of some stability values, and the stability values and the corresponding combustion efficiency have a mapping relationship: the stable value is c 1-combustion efficiency f1, the stable value is c 2-combustion efficiency f2, and the like, the mapping relation is set in advance, and the combustion efficiency is higher corresponding to the larger the stable value.
As shown in fig. 2, the constructed combustion stability trend segment includes a current time, two left time and two right time, and at this time, the stability values at each time are mapped to obtain mapping efficiency, and compared with a preset efficiency to obtain an efficiency qualified segment and an efficiency unqualified segment. t1 is a first time on the left, t2 is a second time on the left, t1 is not a first time on the right, and t2 is not a second time on the right.
In this embodiment, if the time t2 in the stable trend segment is the initial time point of the efficiency failure segment, the combustion adjustment parameters of all the efficiency failure segments after the initial time are determined, that is, by adjusting what parameters, the efficiency is qualified, for example, the failure corresponding to the time t2 is not qualified.
The stable values at the two right moments are predicted and are obtained from the relevant mapping table again on the basis of the corresponding allowable adjustment parameters at each right moment, wherein each allowable adjustment parameter has its participation period.
In this embodiment, the first future time instant refers to the first of the two right hand time instants.
In this embodiment, since the combustion adjustment parameter is to adjust the subsequent parameter, for example, the combustion adjustment parameter is that the fuel coal amount is sufficient to ensure efficient combustion, or the combustion efficiency is ensured, or the discharge port is blocked after the furnace generates slag, which results in the reduction of the combustion efficiency, at this time, the slag can be used as the allowable adjustment parameter to clean the slag, for example, after the slag is cleaned at the next moment, the subsequent efficiency compensation for the coal-fired boiler can be ensured.
The beneficial effects of the technical scheme are as follows: the combustion stability trend section is determined by monitoring different combustion parameters in the coal-fired boiler on line, and the efficiency compensation of the coal-fired boiler at the future moment is realized by dividing whether the efficiency is qualified or not, so that the high-efficiency combustion of the coal-fired boiler is ensured.
The invention provides a real-time on-line monitoring system for the combustion efficiency of a coal-fired boiler, wherein the on-line monitoring module comprises:
an index obtaining unit for obtaining an initial index of the coal-fired boiler;
the system comprises a set acquisition unit, a history index database and a control unit, wherein the set acquisition unit is used for respectively setting initial states to corresponding initial indexes according to the current combustion demand of the coal-fired boiler, and acquiring an index setting set of each initial index related to the current combustion demand from the history index database;
the number counting unit is used for counting a first number related to the variable state of the index and a second number related to the non-variable state of the index in the index setting set corresponding to the same initial index;
the state setting unit is used for setting a double state to the corresponding initial index and taking the double state as a secondary state when the ratio of the first number to the second number is in a preset range;
when the ratio of the first number to the second number is not in the preset range, if the ratio of the first number to the second number is larger than the maximum value of the preset range, setting an index variable state to the corresponding initial index and taking the index variable state as a secondary state;
otherwise, setting an index invariable state to the corresponding initial index and taking the index invariable state as a secondary state;
and the parameter determining unit is used for matching a relevant monitoring mode with a corresponding initial index according to the comparison result of the secondary state and the initial state, and carrying out corresponding online monitoring on the coal-fired boiler according to the monitoring mode to obtain the current combustion parameter.
In this embodiment, the initial index is related to the parameter corresponding to the coal-fired boiler, and there is an index related to the actually generated heat, and at this time, it is necessary to determine the sufficient contact area of oxygen, the amount of coal, and the like of the coal-fired boiler.
In this embodiment, for example, the initial indicator 1 corresponds to the parameters 1 and 2, the initial indicator 2 corresponds to the parameters 3, 4 and 5, the initial indicator 3 corresponds to the parameters 7 and 8, and the initial indicator is set mainly for whether the parameters are allowed to be adjusted later.
In this embodiment, the current combustion demand refers to the need to satisfy a certain combustion probability or the like of the coal-fired boiler, or when the amount of coal used is 1 ton, the heat of y1 needs to be generated, and at this time, a set consistent with the demands needs to be searched, and the history index database contains combustion indexes corresponding to different combustion demands.
In this embodiment, after the current combustion demand is obtained, the initial indicator is automatically set to the current combustion demand, that is, adjustment is allowed and adjustment is not allowed.
For example, there are initial indicators 1, 2, 3:
results set according to requirements: initial index 1-allowing adjustment, initial index 2-allowing adjustment, initial index 3-not allowing adjustment;
acquiring an index setting set consistent with the current combustion demand from a historical index database:
history setting for initial index 1: adjustment permission, adjustment permission;
history setting of initial index 2: adjustment allowed, adjustment disallowed, adjustment allowed;
history setting of initial index 3: adjustment is allowed, not allowed;
in this embodiment, the preset range is 0.8-1.2, and the two states refer to two states of setting a variable state and an invariable state to the index.
In this embodiment, in order to determine the accuracy of the combustion efficiency of the subsequent mapping, and because under the same requirement, there may be a system error or the requirement may correspond to multiple realizable modes, it is required to combine the current initial index of the current coal-fired boiler with the history according to the current requirement, so as to effectively set different indexes, and ensure the accuracy of the subsequent stable determination.
In this embodiment, the minimum value of the preset range is 0.8, and the maximum value of the preset range is 1.2.
In this embodiment, the comparison result refers to the state consistency corresponding to the same initial indicator.
In this embodiment, after determining that the setting state is the last setting state of the index, the monitoring mode is matched to the index according to the type of the index and the setting state of the initial index.
In this embodiment, the monitoring mode refers to what equipment is required to monitor the parameter corresponding to the initial indicator and what time interval is required to monitor the parameter, and the result is obtained from the mapping table.
The beneficial effects of the technical scheme are as follows: by determining the initial index and setting variable states or non-variable states for different indexes according to current demands and historical demands, a basis is provided for determining the final state of the same initial index, the accuracy of the initial index corresponding to the final state is ensured, a stability reminding basis is determined for the follow-up, and the rationality of online monitoring is effectively ensured.
The invention provides a real-time on-line monitoring system for combustion efficiency of a coal-fired boiler, wherein the parameter determining unit comprises:
a sequence building block for building an index sequence based on a first index whose initial state is consistent with the secondary state and a second index whose initial state is inconsistent with the second state;
a function building block, configured to build a judging function B1 based on the index sequence:
wherein b i1 The value of the i 1-th sequence in the index sequence is 0 when the initial state is completely consistent with the secondary state, 1 when the initial state is completely inconsistent with the secondary state, and 0.5 when the initial state is not completely consistent with the secondary state; oc (oc) i1 Index weight representing an initial index corresponding to the i1 st sequence in the index sequences; n1 represents the total number of sequences existing in the index sequence, and each sequence value corresponds to an initial index; b1 represents a judgment function; n1 (bi1=1) represents all b i1 Satisfy b i1 Number of sequences=1; oc (oc) i2 Indicating that b is satisfied i1 Index weight of initial index corresponding to the i2 nd sequence of=1;
a comparison block forWhen (when)Less than a first preset value N01, < >>Less than a second preset value N02 and +.>If the initial state is smaller than the third preset value N03, taking the initial state originally set for each initial index as a final state;
otherwise, toAndperforming difference standard conversion to obtain final difference values A1, A2 and A3;
the difference value determining block is used for obtaining a maximum difference value according to max { A1, A2 and A3}, and screening a judgment type corresponding to the maximum difference value from the difference-type database to obtain a modification mode of the completely inconsistent state;
the state modifying block is used for carrying out partial state modification on the related completely inconsistent state according to the modifying mode and obtaining a final state;
the parameter acquisition block is used for determining a monitoring mode consistent with each initial index based on the index-state-monitoring mapping table, and carrying out corresponding online monitoring on the coal-fired boiler according to the monitoring mode to obtain the current combustion parameter.
In this example, the index sequence contains only 3 values, 1, 0, 0.5, respectively.
In this embodiment, for example, the sequence is [1 1 00 0.5 0.5 1 001 ], and the sequence is obtained by sequentially arranging the corresponding sequence values one by one according to the arrangement order of the initial indicators.
In this embodiment, incomplete agreement means that the corresponding initial indicator is in a double state, so that there will always be one identical state and one different state.
In this embodiment, after determining the current combustion demand, weights are set for different initial indicators, which are preset, the weights of the initial indicators corresponding to different demands are different, and
in this embodiment, different preset values are preset, the value of N01 is 0.3, the value of N02 is 0.3, and the value of N03 is 0.1N1;
the normalization processing of the difference value refers to normalizing the corresponding difference value to ensure the rationality of the subsequent comparison, and each case has a corresponding difference-standard mapping table:
for example,is 0.1, A1 is 1 based on the difference-map table in this case;
is 0.06, A2 of 1.2 is obtained based on the difference-map table in this case;
in this case, A3 is 0.9 based on the difference-to-map table, and A2 is set as the maximum difference value.
In this embodiment, the difference-type database includes different difference comparison cases and correction types corresponding to the difference comparison cases, i.e. judgment types, for example, only the database is called to include b i1 The historical state setting scheme including=1 to determine the final state of the index corresponding to the completely inconsistent state is equivalent to adopting a new mode to reasonably verify the completely inconsistent state.
In this embodiment, for example, the initial state of the initial index is: the variable state and the secondary state are invariable states, and at the moment, the states are completely consistent, and the final verification is carried out on the state of the initial index through the scheme, so that the final state of the index is determined.
In this embodiment, for example, the history state setting scheme (the one closest in time to the present moment) is called when N1 (b i1 On the premise of the condition of=1), the states of the corresponding parameters are obtained by matching.
In this embodiment, the index-state-monitoring map includes different initial indexes, a final state corresponding to the initial indexes, and a monitoring mode matched with the indexes and the states, and monitors the coal-fired boiler on line.
The beneficial effects of the technical scheme are as follows: according to the state comparison result, an index sequence is constructed, a judging function is constructed, different judging conditions in the judging function are compared with standard conditions to determine the existing final modification mode, the final state of the index in the completely inconsistent state is determined, the monitoring mode matched with the index is effectively obtained, and the accuracy of online monitoring is facilitated.
The invention provides a real-time online monitoring system for the combustion efficiency of a coal-fired boiler, wherein the online monitoring module further comprises:
the label setting unit is used for determining a first parameter corresponding to each index and setting a permission label or a non-permission label to be adjusted to the corresponding first parameter according to the final state of the corresponding index;
and the dividing unit is used for dividing the current combustion parameter into an allowable adjustment parameter and an allowable adjustment parameter according to the label setting result.
In this embodiment, for example, the index 1 corresponds to the parameters 1, 2, and 3, where the index 1 is an adjustment permission label, the parameters 1, 2, and 3 are adjustment permission parameters, and when the index is in a variable state, the corresponding label is an adjustment permission label, and vice versa.
The beneficial effects of the technical scheme are as follows: the variable and the invariable parameters are determined by determining the index and the parameters, so that the combustion efficiency is conveniently and effectively monitored, and the combustion efficiency of the boiler is improved.
The invention provides a real-time online monitoring system for combustion efficiency of a coal-fired boiler, wherein the curve prediction module comprises:
the first stabilizing unit is used for monitoring the first monitoring value which does not allow the parameter to be adjusted from the beginning of the use of the coal-fired boiler to the next moment in real time and determining the corresponding first stability;
the second stabilizing unit is used for monitoring the second monitoring value of the same allowable adjustment parameter from the beginning of the use of the coal-fired boiler to the current moment in real time, determining a corresponding change time point and further determining the second stability of the current moment;
the segment construction unit is used for determining a first stable point at the current moment according to the first stability of all the allowable adjustment parameters and the second stability of all the allowable adjustment parameters based on the current moment, simultaneously determining a left extending point and a right extending point according to the distribution of the variation period and the final variation time point of each allowable adjustment parameter, and constructing and obtaining a combustion stable trend segment.
In this embodiment, the time when the boiler starts to be used is t01, and the time is t (current), and at this time, t01 to t (current) are corresponding time periods, and since the effect of the adjustment parameter should not be allowed to be constant during the combustion process of the boiler, the stability thereof can be set to 1.
In this embodiment, the adjustment parameters are allowed to be continuously changed during the combustion process of the boiler, and generally, there is a certain change rule, that is, for example, the coal adding process takes 3 time points as one period, and the changing time points can be regarded as the coal adding at time point 1, the coal using at time point 2 a1, the coal using at time point 3 a2, and the coal adding at time point 4 again.
In this embodiment, the second stability is determined to determine whether there is consistent behavior at different points in time during the cycle, the more consistent the corresponding stability.
In this embodiment, the first stable point at the current moment is calculated according to the stability corresponding to all the non-allowable adjustment parameters and all the allowable adjustment parameters at the current moment, and the first stable point is consistent with the stable value.
In this embodiment, the variation period is a variation period of different variables determined by on-line monitoring according to history, and the variation period of different variables is different.
In this embodiment, the last change time point refers to a period start point or a period end point of the last period based on the same allowable adjustment parameter corresponding to the current time point, and is distributed on both sides of the current time point.
In this embodiment, the left extending point refers to the third distributing point distributed to the left at the present moment, the right extending point refers to the third distributing point distributed to the right at the present moment, and the third is preset, mainly for short-term acquisition, to realize high efficiency and short-term effectiveness of the subsequent future combustion efficiency compensation.
The beneficial effects of the technical scheme are as follows: the stability of the parameters which are not allowed to be adjusted and the stability of the parameters which are allowed to be adjusted are determined, so that the first stable point at the current moment is effectively obtained, the subsequent construction of the combustion stable trend section is facilitated, and the combustion efficiency is improved.
The invention provides a real-time on-line monitoring system for combustion efficiency of a coal-fired boiler, wherein the section construction unit comprises:
a profile construction block for determining a distribution of a fluctuation period and a last fluctuation time point of each allowable adjustment parameter, and constructing a fluctuation profile based on the current time;
an initial segment determining block for locking a third distribution point distributed leftwards from the current moment and a third distribution point distributed rightwards from the current moment according to the fluctuation distribution map to construct an initial combustion segment;
a left-right determining block, configured to obtain a left stable point at each left moment according to a variable set from a third distribution point distributed leftwards to each left moment between the current moment point, and determine a right stable point at each right moment;
and the final segment determining block is used for constructing and obtaining a combustion stability trend segment based on the left stability point, the right stability point and the first stability point.
As shown in fig. 3, a profile is shown, wherein the allowable adjustment parameters include: parameter 1, parameter 2 and parameter 3, wherein the dashed arrow represents the period of parameter 1, the solid arrow represents the period of parameter 2, the bold arrow represents the period of parameter 3, and the connection point with the same line is the corresponding change time point.
In this embodiment, 001, 002, 003 are three distribution points distributed leftward at the next moment, and 001 is taken as a third distribution point, 004, 005, 006 are three distribution points distributed rightward at the next moment, and 006 is taken as a third distribution point on the right side, so that the time period in which the combustion section is constructed is determined.
In this embodiment, after determining the left time period and the right time period, the stable value at each time is calculated according to the time points existing in the different time periods, and the calculated stable value is the same as the calculated stable value at the current time, and the predicted stable value is calculated on the right side according to the periodic variation condition.
In this embodiment, the left time period includes a minimum of 3 time points, and the right time period includes a minimum of 3 time points.
The beneficial effects of the technical scheme are as follows: the trend segment is effectively constructed by constructing a fluctuation distribution diagram, screening distribution points, constructing a combustion segment and determining stable points at each moment, and a foundation is provided for the follow-up improvement of combustion efficiency.
The invention provides a real-time on-line monitoring system for combustion efficiency of a coal-fired boiler, wherein the curve dividing module comprises:
the efficiency conversion unit is used for acquiring the combustion efficiency under the stability at each moment in the combustion stability trend section according to the stability-efficiency mapping table;
and the efficiency comparison unit is used for comparing the combustion efficiency at each moment with the preset efficiency to obtain an efficiency qualified section and an efficiency unqualified section.
In this embodiment, the stability-efficiency map is set in advance, and the corresponding combustion efficiency is different at different moments, and the preset combustion efficiency is set in advance, typically 89%.
In this embodiment, the qualified segment refers to a time point corresponding to the combustion efficiency and the preset efficiency.
The beneficial effects of the technical scheme are as follows: the combustion efficiency at the corresponding time is obtained according to the mapping table, and then the pass and fail sections are effectively determined through efficiency comparison.
The invention provides a real-time on-line monitoring system for combustion efficiency of a coal-fired boiler, wherein the efficiency compensation module comprises:
the dissimilarity determining unit is used for determining the dissimilarity of the combustion parameters corresponding to the next moment and each previous moment in the unqualified efficiency section;
and the efficiency compensation processing is used for determining a first parameter to be compensated at the current moment and a second parameter to be compensated at the first future moment based on the current moment according to all different conditions, so as to realize the efficiency compensation processing of the coal-fired boiler.
In this embodiment, each previous time instant refers to a time instant preceding the next time instant in the efficiency-based reject fraction,
such as: time 1 before: parameter 1 is r1, parameter 2 is r2, time 2 before: parameter 1 is r3, parameter 2 is r4, when: the parameter 1 is r5, the parameter 2 is r6, and the same or different corresponding parameters are obtained by comparing r1 with r5, r3 with r5, r2 with r6, and r4 with r 6.
In this embodiment, the first amount to be compensated is: parameter 1: r5 and r1, r5 and r3, parameter 2: the absolute value of the difference between r6 and r2, and between r6 and r 4;
in this embodiment, the compensation parameter for the first future time is predicted future time, parameter 1 is u1, parameter 2 is u2, and at this time, the second compensation parameter is: parameter 1: u1 and r5, parameter 2: the absolute value of the difference between u2 and r 6;
at this time, the final compensation result for the first future time is: parameter 1: max { r1, r3, r5} -u1, parameter 2: max { r2, r4, r5} -u2, if the results are all less than 0, no compensation is required, and if the results are all greater than 0, only compensation is performed according to the difference.
The beneficial effects of the technical scheme are as follows: the compensation quantity at the current moment and the future moment is determined by determining the difference of parameters at different moments, so that the coal burning efficiency is improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A real-time on-line monitoring system for combustion efficiency of a coal-fired boiler, comprising:
the on-line monitoring module is used for monitoring the current combustion parameters of the coal-fired boiler on line in real time and dividing the current combustion parameters to obtain allowable adjustment parameters and allowable non-adjustable parameters;
the curve prediction module is used for analyzing the combustion stability trend section of the coal-fired boiler at the current moment based on the allowable adjustment parameter and the non-allowable adjustment parameter;
the curve dividing module is used for dividing the combustion stability trend section into sections and determining an efficiency qualified section and an efficiency unqualified section;
the parameter determining module is used for locking the initial time point of the unqualified efficiency section and determining combustion adjustment parameters corresponding to all the unqualified efficiency sections after the initial time point;
and the efficiency compensation module is used for carrying out corresponding efficiency compensation treatment on the coal-fired boiler in time based on the combustion adjustment parameters corresponding to all the efficiency unqualified sections when the first future moment of the combustion stability trend section is reached.
2. The real-time on-line monitoring system for combustion efficiency of a coal-fired boiler according to claim 1, wherein the on-line monitoring module comprises:
an index obtaining unit for obtaining an initial index of the coal-fired boiler;
the system comprises a set acquisition unit, a history index database and a control unit, wherein the set acquisition unit is used for respectively setting initial states to corresponding initial indexes according to the current combustion demand of the coal-fired boiler, and acquiring an index setting set of each initial index related to the current combustion demand from the history index database;
the number counting unit is used for counting a first number related to the variable state of the index and a second number related to the non-variable state of the index in the index setting set corresponding to the same initial index;
the state setting unit is used for setting a double state to the corresponding initial index and taking the double state as a secondary state when the ratio of the first number to the second number is in a preset range;
when the ratio of the first number to the second number is not in the preset range, if the ratio of the first number to the second number is larger than the maximum value of the preset range, setting an index variable state to the corresponding initial index and taking the index variable state as a secondary state;
otherwise, setting an index invariable state to the corresponding initial index and taking the index invariable state as a secondary state;
and the parameter determining unit is used for matching a relevant monitoring mode with a corresponding initial index according to the comparison result of the secondary state and the initial state, and carrying out corresponding online monitoring on the coal-fired boiler according to the monitoring mode to obtain the current combustion parameter.
3. The real-time on-line monitoring system for combustion efficiency of coal-fired boiler according to claim 2, wherein the parameter determination unit comprises:
a sequence building block for building an index sequence based on a first index whose initial state is consistent with the secondary state and a second index whose initial state is inconsistent with the second state;
a function building block, configured to build a judging function B1 based on the index sequence:
wherein b i1 The value of the i 1-th sequence in the index sequence is 0 when the initial state is completely consistent with the secondary state, 1 when the initial state is completely inconsistent with the secondary state, and 0.5 when the initial state is not completely consistent with the secondary state; oc (oc) i1 Index weight representing an initial index corresponding to the i1 st sequence in the index sequences; n1 represents the total number of sequences existing in the index sequence, and each sequence value corresponds to an initial index; b1 represents a judgment function; n1 (b) i1 =1) represents all b i1 Satisfy b i1 Number of sequences=1; oc (oc) i2 Indicating that b is satisfied i1 Index weight of initial index corresponding to the i2 nd sequence of=1;
a comparison block for whenLess than a first preset value N01, < >>Less than a second preset value N02 and +.>If the initial state is smaller than the third preset value N03, taking the initial state originally set for each initial index as a final state;
otherwise, toAndperforming difference standard conversion to obtain final difference values A1, A2 and A3;
the difference value determining block is used for obtaining a maximum difference value according to max { A1, A2 and A3}, and screening a judgment type corresponding to the maximum difference value from the difference-type database to obtain a modification mode of the completely inconsistent state;
the state modifying block is used for carrying out partial state modification on the related completely inconsistent state according to the modifying mode and obtaining a final state;
the parameter acquisition block is used for determining a monitoring mode consistent with each initial index based on the index-state-monitoring mapping table, and carrying out corresponding online monitoring on the coal-fired boiler according to the monitoring mode to obtain the current combustion parameter.
4. The real-time on-line monitoring system for combustion efficiency of a coal-fired boiler of claim 1, wherein the on-line monitoring module further comprises:
the label setting unit is used for determining a first parameter corresponding to each index and setting a permission label or a non-permission label to be adjusted to the corresponding first parameter according to the final state of the corresponding index;
and the dividing unit is used for dividing the current combustion parameter into an allowable adjustment parameter and an allowable adjustment parameter according to the label setting result.
5. The real-time on-line monitoring system for combustion efficiency of a coal-fired boiler of claim 1, wherein the curve prediction module comprises:
the first stabilizing unit is used for monitoring the first monitoring value which does not allow the parameter to be adjusted from the beginning of the use of the coal-fired boiler to the next moment in real time and determining the corresponding first stability;
the second stabilizing unit is used for monitoring the second monitoring value of the same allowable adjustment parameter from the beginning of the use of the coal-fired boiler to the current moment in real time, determining a corresponding change time point and further determining the second stability of the current moment;
the segment construction unit is used for determining a first stable point at the current moment according to the first stability of all the allowable adjustment parameters and the second stability of all the allowable adjustment parameters based on the current moment, simultaneously determining a left extending point and a right extending point according to the distribution of the variation period and the final variation time point of each allowable adjustment parameter, and constructing and obtaining a combustion stable trend segment.
6. The real-time on-line monitoring system for combustion efficiency of coal-fired boiler as set forth in claim 5, wherein said segment construction unit includes:
a profile construction block for determining a distribution of a fluctuation period and a last fluctuation time point of each allowable adjustment parameter, and constructing a fluctuation profile based on the current time;
an initial segment determining block for locking a third distribution point distributed leftwards from the current moment and a third distribution point distributed rightwards from the current moment according to the fluctuation distribution map to construct an initial combustion segment;
a left-right determining block, configured to obtain a left stable point at each left moment according to a variable set from a third distribution point distributed leftwards to each left moment between the current moment point, and determine a right stable point at each right moment;
and the final segment determining block is used for constructing and obtaining a combustion stability trend segment based on the left stability point, the right stability point and the first stability point.
7. The real-time on-line monitoring system for combustion efficiency of coal-fired boiler according to claim 1, wherein the curve dividing module comprises:
the efficiency conversion unit is used for acquiring the combustion efficiency under the stability at each moment in the combustion stability trend section according to the stability-efficiency mapping table;
and the efficiency comparison unit is used for comparing the combustion efficiency at each moment with the preset efficiency to obtain an efficiency qualified section and an efficiency unqualified section.
8. The real-time on-line monitoring system for combustion efficiency of a coal-fired boiler of claim 1, wherein the efficiency compensation module comprises:
the dissimilarity determining unit is used for determining the dissimilarity of the combustion parameters corresponding to the next moment and each previous moment in the unqualified efficiency section;
and the efficiency compensation processing is used for determining a first parameter to be compensated at the current moment and a second parameter to be compensated at the first future moment based on the current moment according to all different conditions, so as to realize the efficiency compensation processing of the coal-fired boiler.
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