CN111966060B - SCR ammonia injection control optimization method, device, equipment and storage medium - Google Patents
SCR ammonia injection control optimization method, device, equipment and storage medium Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 298
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 149
- 238000002347 injection Methods 0.000 title claims abstract description 117
- 239000007924 injection Substances 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005457 optimization Methods 0.000 title claims description 28
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 142
- 239000003245 coal Substances 0.000 claims abstract description 50
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000003546 flue gas Substances 0.000 claims abstract description 44
- 238000005507 spraying Methods 0.000 claims abstract description 29
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- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 22
- 230000023556 desulfurization Effects 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 4
- 230000003009 desulfurizing effect Effects 0.000 claims description 4
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- RZCJYMOBWVJQGV-UHFFFAOYSA-N 2-naphthyloxyacetic acid Chemical compound C1=CC=CC2=CC(OCC(=O)O)=CC=C21 RZCJYMOBWVJQGV-UHFFFAOYSA-N 0.000 description 1
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- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41845—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by system universality, reconfigurability, modularity
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/33—Director till display
- G05B2219/33273—DCS distributed, decentralised controlsystem, multiprocessor
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Abstract
The invention discloses a method, a device, equipment and a storage medium for controlling and optimizing SCR ammonia injection, wherein the method comprises the following steps: establishing a flue gas flow calculation model based on historical fire coal data of the thermal power generating unit, and inputting the current fire coal data of the thermal power generating unit into the calculation model to obtain the theoretical flue gas flow of the thermal power generating unit; calculating to obtain the theoretical ammonia spraying flow of the SCR denitration system according to the theoretical flue gas flow; calibrating the theoretical ammonia injection flow according to the collected concentration of the nitrogen oxide at the desulfurization outlet, the concentration of the nitrogen oxide at the outlet of the SCR denitration system and/or the operation parameter of the thermal power unit causing the concentration of the nitrogen oxide at the inlet of the SCR denitration system to change; and adjusting based on the calibrated theoretical ammonia injection flow. The invention enhances the automatic regulation capability and the working condition adaptability of the SCR ammonia injection system when the load of the coal-fired thermal power generating unit changes, reduces the phenomenon of excessive ammonia injection and reduces the ammonia escape amount.
Description
Technical Field
The invention relates to the technical field of denitration of coal-fired thermal power generating units, in particular to an SCR ammonia injection control optimization method, device, equipment and storage medium.
Background
Along with the increasing retry of the society on environmental protection, the NO of the coal-fired boilerXThe deep removal control of nitrogen oxides is imperative, and the Selective Catalytic Reduction (SCR) flue gas denitration technology is the technology for removing NO in coal-fired flue gas so farXOne of the most efficient methods. The principle of SCR is that under the action of catalyst, reducing agent NH3Selective introduction of NO at 290-XReduction to N2While almost no NH occurs3And O2Oxidation reaction of (3). Compared with a liquid absorption method, an activated carbon adsorption method, an electron beam method, a microbiological method, a non-selective catalytic reduction method and the like, the SCR has the advantages of simple device structure, high removal efficiency (up to more than 90%), large flue gas treatment capacity, reliable operation, convenience in maintenance and the like, so that the SCR is the most widely applied denitration technology at present.
Referring now to FIG. 1, the control method for SCR denitration system generally refers to the NO output from SCR denitration systemXThe concentration measuring point is a control target value, and the specific control idea is as follows: after the extraction type sampling, the smoke is dividedThe analyzer analyzes the smoke components and analyzes NOXThe concentration value is returned to DCS system (distributed control system) which uses the NOXThe concentration is a control target value, and a PID (proportion integration differentiation controller) program is adopted to carry out real-time adjustment on the ammonia spraying adjusting valve. NO in each area in flue can be caused by change of combustion working conditions of coal-fired thermal power generating unitXChange in concentration and NO on the current flueXThe measuring device is mostly an extraction type sampling device, and the sampling device and the flue gas component analysis device have hysteresis. Therefore, the automatic adjusting capability of the control method of the current SCR denitration system is poor, and the deviation is large.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an SCR ammonia injection control optimization method, device, equipment and storage medium.
In a first aspect of the present invention, an SCR ammonia injection control optimization method is provided, including the following steps:
establishing a flue gas flow calculation model based on historical fire coal data of the thermal power generating unit, and inputting the current fire coal data of the thermal power generating unit into the calculation model to obtain the theoretical flue gas flow of the thermal power generating unit;
calculating to obtain the theoretical ammonia spraying flow of the SCR denitration system according to the theoretical flue gas flow;
calibrating the theoretical ammonia injection flow according to the acquired nitrogen oxide concentration at the desulfurization outlet, the acquired nitrogen oxide concentration at the SCR denitration system outlet and/or the acquired thermal power unit operation parameters causing the nitrogen oxide concentration at the SCR denitration system inlet to change;
and adjusting based on the calibrated theoretical ammonia injection flow.
According to some embodiments of the invention, the fire coal data comprises: coal feed, boiler oxygen, and coal calorific value.
According to some embodiments of the invention, the computational model trains historical fire coal data based on a neural network model.
According to some embodiments of the invention, the thermal power generating unit operating parameters comprise: coal mill parameters, total air quantity parameters and burn-out air parameters.
According to some embodiments of the present invention, the calibrating the theoretical ammonia injection flow according to the collected nitrogen oxide concentration at the desulfurization outlet, the collected nitrogen oxide concentration at the SCR denitration system outlet, and/or the collected thermal power unit operating parameter that causes a change in the collected nitrogen oxide concentration at the SCR denitration system inlet includes:
calibrating the theoretical ammonia spraying flow once according to the concentration of the nitrogen oxide at the desulfurization outlet and the concentration of the nitrogen oxide at the outlet of the SCR denitration system;
and carrying out secondary calibration on the theoretical ammonia injection flow after the primary calibration according to the coal mill parameter, the total air quantity parameter and the burning air parameter.
According to some embodiments of the present invention, the calculating the theoretical ammonia injection flow rate of the SCR denitration system according to the theoretical flue gas flow rate specifically includes:
calculating the difference value between the concentration of the nitrogen oxide at the inlet of the SCR denitration system and the concentration set value of the nitrogen oxide at the outlet of the SCR denitration system;
and performing product operation on the calculated difference value, the set value of the concentration of the nitric oxide, the molar ratio of the ammonia nitrogen and the theoretical flue gas flow to obtain the theoretical ammonia spraying flow of the SCR denitration system.
In a second aspect of the present invention, there is provided an SCR ammonia injection control optimization device, including: the device comprises a theoretical flue gas flow calculating unit, a theoretical ammonia injection flow calculating unit, a calibration unit and an adjusting unit;
the theoretical flue gas flow calculation unit is used for establishing a flue gas flow calculation model based on historical fire coal data of the thermal power generating unit, inputting the current fire coal data of the thermal power generating unit into the calculation model, and obtaining the theoretical flue gas flow of the thermal power generating unit;
the theoretical ammonia injection flow calculating unit is used for calculating and obtaining the theoretical ammonia injection flow of the SCR denitration system according to the theoretical flue gas flow;
the calibration unit is used for calibrating the theoretical ammonia injection flow according to the acquired nitrogen oxide concentration at the desulfurization outlet, the acquired nitrogen oxide concentration at the SCR denitration system outlet and/or the acquired thermal power unit operation parameters causing the nitrogen oxide concentration at the SCR denitration system inlet to change;
and the adjusting unit is used for adjusting the theoretical ammonia spraying flow based on the calibrated theoretical ammonia spraying flow.
In a third aspect of the invention, an SCR ammonia injection control optimization device is provided, comprising at least one control processor and a memory for communicative connection with the at least one control processor; the memory stores instructions executable by the at least one control processor to enable the at least one control processor to perform a method of SCR ammonia injection control optimization according to the first aspect of the invention.
In a fourth aspect of the present invention, a computer-readable storage medium is characterized in that: the computer-readable storage medium stores computer-executable instructions for causing a computer to perform the method for SCR ammonia injection control optimization according to the first aspect of the present invention.
According to the embodiment of the invention, at least the following technical effects are achieved:
firstly, establishing a smoke gas flow calculation model based on historical fire coal data of a thermal power generating unit, carrying out data analysis, and obtaining theoretical smoke gas flow by inputting current fire coal data; then, calculating the theoretical flue gas flow to obtain the theoretical ammonia injection flow, and prejudging the ammonia injection flow of the SCR denitration system; and finally, calibrating the theoretical ammonia injection flow according to the concentration of the nitrogen oxide at the desulfurization outlet, the concentration of the nitrogen oxide at the outlet of the SCR denitration system and/or the operation parameters of the thermal power generating unit which cause the change of the concentration of the nitrogen oxide at the inlet of the SCR denitration system. The invention improves the NO of the SCR ammonia spraying control systemXThe automatic regulation capability and the working condition adaptability under the condition that the concentration changes at any time reduce the phenomenon of excessive ammonia injection and reduce the escape amount of ammonia.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a prior art SCR ammonia injection control system according to the present invention;
FIG. 2 is a schematic structural diagram of an SCR ammonia injection control system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for optimizing SCR ammonia injection control according to an embodiment of the present invention;
FIG. 4 is a block diagram of a method for optimizing SCR ammonia injection control according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an SCR ammonia injection control optimization device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an SCR ammonia injection control optimization device according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 2, the SCR ammonia injection control system mainly includes the following components: the device comprises a hearth, an SCR denitration system, an air preheater, a dust remover, a desulfurizing tower and a chimney.
The coal entering the hearth through the coal mill is combusted in the hearth to generate the coal containing high-concentration NOXThe flue gas has high concentration of NO after the flue gas is acted by an SCR denitration systemXIs reacted with, NOXConcentration is reduced to SCR denitration system outlet NOXThe concentration set value is horizontal, and finally the concentration set value reaches a chimney through an air preheater, a dust remover and a desulfurizing tower to be discharged. Wherein: the hearth inlet is provided with a coal feeding amount, a coal heat value and a coal mill starting and stopping measuring point, the hearth inlet is also provided with a total air quantity measuring point, a boiler oxygen amount measuring point and a burning air measuring point,the inlet of the SCR denitration system is provided with an inlet NO of the SCR denitration systemXThe outlet of the SCR denitration system is provided with an SCR denitration system outlet NOXA concentration measuring point and a desulfurization outlet NOXAnd (6) measuring the concentration. An ammonia spraying adjusting valve is arranged on an ammonia spraying pipeline at the inlet of the SCR denitration system and is used for adjusting the flow of ammonia spraying; and the ammonia spraying pipeline at the inlet of the SCR denitration system is also provided with a flowmeter for measuring the actual ammonia spraying flow.
Referring to fig. 2 to 4, in an embodiment of the present invention, an SCR ammonia injection control optimization method is provided, including the following steps:
s100, establishing a flue gas flow calculation model based on historical fire coal data of the thermal power generating unit, and inputting the current fire coal data of the thermal power generating unit into the calculation model to obtain the theoretical flue gas flow of the thermal power generating unit;
s200, calculating to obtain the theoretical ammonia spraying flow of the SCR denitration system according to the theoretical flue gas flow;
s300, calibrating theoretical ammonia spraying flow according to the collected nitrogen oxide concentration at the desulfurization outlet, the collected nitrogen oxide concentration at the SCR denitration system outlet and the collected thermal power unit operation parameters causing the nitrogen oxide concentration at the SCR denitration system inlet to change;
and S400, adjusting based on the calibrated theoretical ammonia injection flow.
In step S100 of this embodiment, the calculation model trains the input historical fire coal data through the neural network model, and inputs the acquired current fire coal data into the trained calculation model to obtain the output theoretical flue gas flow rate. As an alternative embodiment, the fire coal data herein includes: coal feed, boiler oxygen, and coal calorific value.
In step S200 of this embodiment, a specific process of calculating a theoretical ammonia injection flow rate of the SCR denitration system according to the theoretical flue gas flow rate is as follows:
s201, calculating a difference value between the concentration of nitrogen oxide at the inlet of the SCR denitration system and the concentration set value of nitrogen oxide at the outlet of the SCR denitration system;
s202, performing product operation on the calculated difference value, the set nitrogen oxide concentration value and the theoretical flue gas flow to obtain the theoretical ammonia spraying flow of the SCR denitration system.
The corresponding calculation formula is: theoretical ammonia injection flow rate (theoretical flue gas flow rate) (NO at inlet of SCR denitration systemXconcentration-NO at the outlet of SCR denitration systemXConcentration set value) ammonia nitrogen molar ratio.
In step S300 of this embodiment, the thermal power unit operating parameters causing the change of the concentration of nitrogen oxides at the inlet of the SCR denitration system include, but are not limited to: coal mill parameters, total air volume parameters and burnout air parameters, the specific process of step S300 is as follows:
s301, calibrating the theoretical ammonia spraying flow once according to the concentration of the nitrogen oxide at the desulfurization outlet and the concentration of the nitrogen oxide at the outlet of the SCR denitration system;
and S302, performing secondary calibration on the theoretical ammonia injection flow after primary calibration according to the coal mill parameter, the total air quantity parameter and the burning air parameter.
In step S301, the nox removal effect of the SCR nox removal system can be obtained by collecting NO at the outlet of the SCR nox removal systemXConcentration, but SCR denitration outlet NOXThe concentration is not necessarily measured accurately, since NO is present on this sectionXIt is not necessarily uniform in concentration; the desulfurizing tower has certain NO removalXThus this example uses NO at the desulfurization outletXConcentration and NO at outlet of SCR denitration systemXThe concentration is used for calibrating the theoretical ammonia injection flow once, so that the rationality of the theoretical ammonia injection flow is improved. The specific implementation process comprises the following steps: when SCR denitration outlet NOXThe concentration exceeds the limit value of 40mg/m3Or desulfurization outlet NOXThe concentration exceeds the limit value by 50mg/m3When the difference value of the theoretical ammonia injection flow and the corrected ammonia injection flow is increased, a corrected ammonia injection value is artificially increased, wherein the corrected ammonia injection value is 10% of the theoretical ammonia injection flow, and the theoretical ammonia injection flow is calibrated; when SCR denitration outlet NOXThe concentration is lower than the limit value of 40mg/m3And desulfurization outlet NOXThe concentration is 50mg/m below the limit value3And when the difference value between the two values is reduced, the corrected ammonia spraying value is set to be 0. It is noted that due to the NO at the outlet of the desulfurizationXPossibly in higher concentration than SCR denitration outlet NOXAt a concentration that may also be lower than the SCR denitration outlet NOXConcentration, here in the NO at the outlet of the desulfurizationXConcentration higher than SCR denitration outlet NOXThe concentration is explained.
In step S302, the variation of the coal mill, the total air volume and the burn-out air parameters can cause the NO at the inlet of the SCR denitration systemXThe concentration changes, so the embodiment performs secondary calibration on the theoretical ammonia injection flow after the primary calibration according to the changes of parameters of the coal mill, the total air volume and the burning air. The specific implementation process comprises the following steps: when the coal mill is started, the air quantity is increased by more than 5% and the burning air is closed, a feedforward value is artificially increased to the theoretical ammonia injection flow after primary calibration, wherein the feedforward value is 20% of the theoretical ammonia injection flow; and when the coal mill is started for 300S, the air quantity does not increase by more than 5% of the limit value, and the burnout air is started, the feedforward signal disappears, and the feedforward value is set to be 0.
In step S400 of this embodiment, the ammonia injection valve is actively adjusted according to the calibrated theoretical ammonia injection flow. The specific implementation process comprises the following steps: inputting the opening of the ammonia injection valve, the actual ammonia injection flow and the calibrated theoretical ammonia injection flow into a PID controller, calculating the deviation proportion (P) of input data by the PID controller, performing integral (I) and differential (D) calculation, and outputting an ammonia injection valve opening instruction; and the ammonia injection regulating valve regulates according to the opening instruction of the ammonia injection regulating valve.
The SCR ammonia injection control optimization method provided by the embodiment has the following beneficial effects:
the theoretical flue gas flow is obtained by inputting the currently collected coal-fired data such as the coal feeding amount, the boiler oxygen amount, the coal heat value and the like into a trained calculation model, and the theoretical flue gas flow is combined with the NO at the inlet of an SCR (selective catalytic reduction) denitration systemXConcentration, SCR denitration system outlet NOXCalculating a set value of the concentration and ammonia nitrogen molar ratio parameters to obtain theoretical ammonia spraying flow of the SCR denitration system, and realizing advanced prejudgment and calculation of the ammonia spraying flow; NO passing through desulfurization outletXConcentration, NO at outlet of SCR denitration systemXThe concentration, the coal mill parameter, the total air quantity parameter and the combustion air parameter calibrate the theoretical ammonia injection flow, and further improve the theoretical ammonia injection flowAnd (4) rationality. According to the embodiment, the automatic regulation capability and the working condition adaptive capability of the SCR ammonia injection system are enhanced when the load of the coal-fired thermal power generating unit changes through the advanced prejudgment and calibration of the ammonia injection flow, the excessive ammonia injection phenomenon is reduced, and the ammonia escape amount is reduced.
Referring to fig. 5, according to an embodiment of the present invention, there is provided an SCR ammonia injection control optimization apparatus, including: the device comprises a theoretical flue gas flow calculating unit, a theoretical ammonia injection flow calculating unit, a calibration unit and an adjusting unit;
the theoretical flue gas flow calculation unit is used for establishing a flue gas flow calculation model based on historical fire coal data of the thermal power generating unit, inputting the current fire coal data of the thermal power generating unit into the calculation model, and obtaining the theoretical flue gas flow of the thermal power generating unit;
the theoretical ammonia spraying flow calculation unit is used for calculating and obtaining the theoretical ammonia spraying flow of the SCR denitration system according to the theoretical flue gas flow;
the calibration unit is used for calibrating the theoretical ammonia injection flow according to the acquired nitrogen oxide concentration at the desulfurization outlet, the collected nitrogen oxide concentration at the SCR denitration system outlet and/or the collected thermal power unit operation parameters causing the change of the nitrogen oxide concentration at the SCR denitration system inlet;
and the adjusting unit is used for adjusting the theoretical ammonia injection flow based on the calibration.
It should be noted that, since the device of the present embodiment and the SCR ammonia injection control optimization method of the foregoing embodiment are based on the same inventive concept, the corresponding contents in the method embodiment are also applicable to the embodiment of the present device, and are not described in detail herein.
Referring to fig. 6, an embodiment of the present invention provides an SCR ammonia injection control optimization device, which may be any type of smart terminal, such as a mobile phone, a tablet computer, a personal computer, and the like.
Specifically, the apparatus includes: one or more control processors and memory, one control processor being exemplified in fig. 6. The control processor and the memory may be connected by a bus or other means, as exemplified by the bus connection in fig. 6.
The memory, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the SCR ammonia injection control optimization device in embodiments of the present invention. The control processor executes various functional applications and data processing of the SCR ammonia injection control optimization device by running non-transitory software programs, instructions and modules stored in the memory, so as to implement the SCR ammonia injection control optimization method of the above method embodiment.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to usage of a unit operation cost statistic device of the chemical-desalination water treatment system, and the like. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory remotely located from the control processor, and the remote memory may be connected to the SCR ammonia injection control optimization device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory and, when executed by the one or more control processors, perform the SCR ammonia injection control optimization method of the above-described method embodiments, e.g., performing method steps S100-S400 of fig. 3 described above.
Embodiments of the present invention also provide a computer-readable storage medium storing computer-executable instructions, which are executed by one or more control processors, for example, by one of the control processors in fig. 6, and may cause the one or more control processors to execute the SCR ammonia injection control optimization method in the above method embodiments, for example, execute the above-described method steps S100 to S400 in fig. 3.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Through the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by software plus a general hardware platform. Those skilled in the art will appreciate that all or part of the processes of the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in a computer readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. The SCR ammonia spraying control optimization method is applied to an SCR ammonia spraying control system, the SCR ammonia spraying control system comprises a hearth, an SCR denitration system, an air preheater, a dust remover, a desulfurizing tower and a chimney, and the method comprises the following steps:
establishing a flue gas flow calculation model based on historical fire coal data of the thermal power generating unit, and inputting the current fire coal data of the thermal power generating unit into the calculation model to obtain the theoretical flue gas flow of the thermal power generating unit;
calculating to obtain the theoretical ammonia spraying flow of the SCR denitration system according to the theoretical flue gas flow;
calibrating the theoretical ammonia injection flow once according to the concentration of the nitrogen oxides at the desulfurization outlet and the concentration of the nitrogen oxides at the outlet of the SCR denitration system, wherein the calibration once comprises the following steps: when the concentration of nitrogen oxides at the desulfurization outlet exceeds 40mg/m3The concentration of nitrogen oxides at the outlet of the SCR denitration system exceeds 50mg/m3When the difference between the concentration of the nitrogen oxide at the desulfurization outlet and the concentration of the nitrogen oxide at the outlet of the SCR denitration system is increased, a corrected ammonia injection value is added to the theoretical ammonia injection flow, and the corrected ammonia injection value is 10% of the theoretical ammonia injection flow;
and carrying out secondary calibration on the theoretical ammonia injection flow after the primary calibration according to parameters of the coal mill, parameters of total air volume and parameters of burning air, wherein the secondary calibration comprises the following steps: when the coal mill is started, the air volume is increased by 5% and the burning air is shut down, a feed-forward value is added to the theoretical ammonia injection flow after the primary calibration, and the feed-forward value is 20% of the theoretical ammonia injection flow after the primary calibration;
adjusting based on the calibrated theoretical ammonia injection flow: inputting the opening of the ammonia injection valve, the actual ammonia injection flow and the calibrated theoretical ammonia injection flow into a PID controller, and outputting an opening instruction of the ammonia injection valve through PID so that the ammonia injection regulating valve is regulated according to the opening instruction of the ammonia injection valve.
2. The SCR ammonia injection control optimization method of claim 1, wherein the fire coal data comprises: coal feed, boiler oxygen, and coal calorific value.
3. The SCR ammonia injection control optimization method of claim 2, wherein the computational model trains historical fire coal data based on a neural network model.
4. The SCR ammonia injection control optimization method according to claim 1, wherein the calculating of the theoretical ammonia injection flow rate of the SCR denitration system according to the theoretical flue gas flow rate specifically comprises:
calculating the difference value between the concentration of the nitrogen oxide at the inlet of the SCR denitration system and the concentration set value of the nitrogen oxide at the outlet of the SCR denitration system;
and performing product operation on the calculated difference value, the set value of the concentration of the nitric oxide, the molar ratio of the ammonia nitrogen and the theoretical flue gas flow to obtain the theoretical ammonia spraying flow of the SCR denitration system.
5. An SCR ammonia injection control optimization device, comprising: the device comprises a theoretical flue gas flow calculating unit, a theoretical ammonia injection flow calculating unit, a calibration unit and an adjusting unit;
the theoretical flue gas flow calculation unit is used for establishing a flue gas flow calculation model based on historical fire coal data of the thermal power generating unit, and inputting the current fire coal data of the thermal power generating unit into the calculation model to obtain the theoretical flue gas flow of the thermal power generating unit;
the theoretical ammonia injection flow calculating unit is used for calculating and obtaining the theoretical ammonia injection flow of the SCR denitration system according to the theoretical flue gas flow;
the calibration unit is used for calibrating the theoretical ammonia injection flow once according to the concentration of nitrogen oxides at the desulfurization outlet and the concentration of nitrogen oxides at the outlet of the SCR denitration system, and the calibration once comprises the following steps: when the concentration of nitrogen oxides at the desulfurization outlet exceeds 40mg/m3The concentration of nitrogen oxides at the outlet of the SCR denitration system exceeds 50mg/m3And when the difference between the concentration of the nitrogen oxide at the desulfurization outlet and the concentration of the nitrogen oxide at the outlet of the SCR denitration system is increased, adding a correction ammonia injection value for the theoretical ammonia injection flow, wherein the correction ammonia injection value is used for correcting the ammonia injection flowThe value is 10% of the theoretical ammonia injection flow;
the calibration unit is also used for carrying out secondary calibration on the theoretical ammonia injection flow after primary calibration according to parameters of a coal mill, total air quantity parameters and combustion air parameters, wherein the secondary calibration comprises the following steps: when the coal mill is started, the air volume is increased by 5% and the burning air is shut down, a feed-forward value is added to the theoretical ammonia injection flow after the primary calibration, and the feed-forward value is 20% of the theoretical ammonia injection flow after the primary calibration;
the adjusting unit is used for adjusting the theoretical ammonia spraying flow based on the calibrated theoretical ammonia spraying flow: inputting the opening of the ammonia injection valve, the actual ammonia injection flow and the calibrated theoretical ammonia injection flow into a PID controller, and outputting an opening instruction of the ammonia injection valve through PID so that the ammonia injection regulating valve is regulated according to the opening instruction of the ammonia injection valve.
6. An SCR ammonia injection control optimizing equipment which is characterized in that: comprises at least one control processor and a memory for communicative connection with the at least one control processor; the memory stores instructions executable by the at least one control processor to enable the at least one control processor to perform the method of optimizing SCR ammonia injection control of any one of claims 1-4.
7. A computer-readable storage medium characterized by: the computer-readable storage medium stores computer-executable instructions for causing a computer to perform the method for SCR ammonia injection control optimization of any one of claims 1 to 4.
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