CN110160041B - CFB boiler pollutant coupling control method and CFB boiler pollutant coupling control system - Google Patents
CFB boiler pollutant coupling control method and CFB boiler pollutant coupling control system Download PDFInfo
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- CN110160041B CN110160041B CN201910473238.9A CN201910473238A CN110160041B CN 110160041 B CN110160041 B CN 110160041B CN 201910473238 A CN201910473238 A CN 201910473238A CN 110160041 B CN110160041 B CN 110160041B
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- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 76
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 76
- 230000008878 coupling Effects 0.000 title claims abstract description 42
- 238000010168 coupling process Methods 0.000 title claims abstract description 42
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 27
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 150
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 123
- 235000019738 Limestone Nutrition 0.000 claims abstract description 73
- 239000006028 limestone Substances 0.000 claims abstract description 73
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 55
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 55
- 239000001301 oxygen Substances 0.000 claims abstract description 55
- 239000000356 contaminant Substances 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 abstract description 13
- 230000023556 desulfurization Effects 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 6
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000036284 oxygen consumption Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
Abstract
The invention provides a CFB boiler pollutant coupling control method and a CFB boiler pollutant coupling control system. The method comprises the following steps: s1, establishing a functional relation among emission concentrations of different pollutants in the operation process of the CFB boiler, wherein the pollutants comprise sulfur dioxide and nitrogen oxides; s2, applying the function relation to the relation among the oxygen quantity, the limestone adding quantity and the pollutant emission concentration to obtain the oxygen quantity and the limestone adding quantity when the pollutant emission concentration is the lowest and recording the oxygen quantity and the limestone adding quantity as optimal values; and S3, controlling the oxygen amount and the limestone addition amount to be optimal values. By obtaining CFB boiler SO2Emission concentration and NOxThe quantitative coupling relation of the emission concentration gives the optimal recommended value of the pollutant control concentration and the limestone adding amount, SO that the SO of the CFB boiler2Emission concentration and NOxThe emission concentration reaches the integral optimal value, the CFB pollutant control operation is guided, the operation intensity of operators is reduced, and the calcium-sulfur ratio of desulfurization in the furnace is reduced.
Description
Technical Field
The invention relates to the field of CFB boilers, in particular to a CFB boiler pollutant coupling control method and a CFB boiler pollutant coupling control system.
Background
At present, CFB boiler generator set often adopts in-furnace desulfurization to control SO2Discharging, i.e. adjusting the limestone adding amount by automatically and manually controlling the feeding machine frequency of the limestone through a limestone adding system, and adjusting SO by increasing or decreasing the molar ratio of calcium to sulfur2And (4) discharging the amount. In the aspect of denitration in the CFB unit furnace, the operation measures of controlling the operation oxygen quantity, the bed temperature, the graded air distribution and the like are adopted to reduce NOxThe concentration of the emission.
However, limestone added for CFB furnace desulfurization is specific to NOxThe generation of the sulfur has certain catalytic action, and the increase of the running oxygen quantity can also promote the desulfurization reaction to be carried out, SO that the SO is reduced2Emission concentration with simultaneous increase of NOxAnd (4) discharging the amount. Therefore, in actual operation, it is found that with the unit SO2Gradual reduction of emissions, NOxThe emissions are gradually increased and the concentration of both emissions exhibits the effect of "this trade off", as shown in figure 1. The above problems cause great difficulties in controlling the operation of the CFB contamination.
Disclosure of Invention
The invention mainly aims to provide a CFB boiler pollutant coupling control method and a CFB boiler pollutant coupling control system, so as to solve the problem that the CFB pollutant is difficult to control and operate in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a CFB boiler contaminant coupling control method, comprising the steps of: s1, establishing a functional relation among emission concentrations of different pollutants in the operation process of the CFB boiler, wherein the pollutants comprise sulfur dioxide and nitrogen oxides; s2, applying the function relation to the relation among the oxygen quantity, the limestone adding quantity and the pollutant emission concentration to obtain the oxygen quantity and the limestone adding quantity when the pollutant emission concentration is the lowest and recording the oxygen quantity and the limestone adding quantity as optimal values; and S3, controlling the oxygen amount and the limestone addition amount to be optimal values.
Further, the step of establishing the functional relationship comprises: s11, establishing a first functional relation C (NO)x)+K×C(SO2) Wherein, C (NO)x) Is the concentration of nitrogen oxides, C (SO)2) The emission concentration of sulfur dioxide; s12, sulfur dioxide emission concentration and nitrogen oxide emission concentration at different time points under the same load are applied to the functional relation to obtain K and M.
Further, step S11 includes: measuring the sulfur dioxide emission concentration and the nitrogen oxide emission concentration of the CFB boiler under different loads, and drawing a relation curve; respectively carrying out data fitting on the relation curves to obtain a plurality of functional relation formulas of the sulfur dioxide emission concentration and the nitrogen oxide emission concentration; and obtaining a first functional relation according to the rule among the functional relations.
Further, the step of obtaining the optimal values of the oxygen amount and the limestone addition amount comprises: s21, establishing a constraint condition according to the relation between the sulfur dioxide emission concentration and the nitrogen oxide emission concentration, and applying the constraint condition to the functional relation to obtain the optimal value of the sulfur dioxide emission concentration; and S22, applying the optimal value of the sulfur dioxide emission concentration to the relation among the oxygen quantity, the limestone adding quantity and the sulfur dioxide emission concentration to obtain the optimal value of the oxygen quantity and the optimal value of the limestone adding quantity.
Further, the constraint conditions are: controlling the emission concentration of nitrogen oxides to be 100-150 mg/Nm3。
According to another aspect of the present invention, there is provided a CFB boiler pollutant coupling control system electrically connected to a CFB boiler power plant, the CFB boiler power plant including a CFB boiler, a pollutant discharge line in communication with the CFB boiler, and a limestone conveying system, the pollutant coupling control system further including: the collecting unit is communicated with the pollutant discharge pipeline and is used for collecting the concentration of pollutants, and the pollutants comprise sulfur dioxide and nitrogen oxide; the first calculation unit is electrically connected with the acquisition unit and is used for establishing a functional relation among the emission concentrations of different pollutants; the second calculation unit is electrically connected with the first calculation unit and is used for applying the functional relation to the relation among the oxygen quantity, the limestone adding quantity and the pollutant emission concentration to obtain the oxygen quantity and the limestone adding quantity when the pollutant emission concentration is lowest and recording the oxygen quantity and the limestone adding quantity as optimal values; and the control unit is electrically connected with the CFB boiler, the limestone conveying system and the second calculation unit respectively and is used for controlling the oxygen amount and the limestone adding amount to be optimal values.
Further, the first calculation unit includes: a data fitting module electrically connected with the acquisition unit and used for establishing a first functional relation C (NO)x)+K×C(SO2) Wherein, C (NO)x) Is the concentration of nitrogen oxides, C (SO)2) The emission concentration of sulfur dioxide; and the first calculation module is electrically connected with the data fitting module and is used for applying the sulfur dioxide emission concentration and the nitrogen oxide emission concentration at different time points under the same load to the functional relation to obtain K and M.
Further, the second calculation unit includes: the second calculation module is electrically connected with the first calculation module and used for establishing a constraint condition according to the relation between the sulfur dioxide emission concentration and the nitrogen oxide emission concentration and applying the constraint condition to the functional relation so as to obtain the optimal value of the sulfur dioxide emission concentration; and the third calculation module is electrically connected with the second calculation module and is used for applying the optimal value of the sulfur dioxide emission concentration to the relation among the oxygen quantity, the limestone adding quantity and the sulfur dioxide emission concentration so as to obtain the optimal value of the oxygen quantity and the optimal value of the limestone adding quantity.
The technical scheme of the invention provides a CFB boiler pollutant coupling control method, which is implemented by acquiring SO of the CFB boiler2Emission concentration and NOxThe quantitative coupling relation of the emission concentration gives the optimal recommended value of the pollutant control concentration and the limestone adding amount, SO that the SO of the CFB boiler2Emission concentration and NOxThe emission concentration reaches the integral optimal value, the CFB pollutant control operation is guided, the operation intensity of operators is reduced, the calcium-sulfur ratio of desulfurization in the furnace is reduced, and the operation economy of a power plant is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a graph showing the relationship between the pollutant emission concentration of a CFB boiler and the change of oxygen in the prior art;
FIG. 2 is a flow chart illustrating a CFB boiler contaminant coupling control method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the relationship between the concentration of nitrogen oxide emissions and the concentration of sulfur dioxide emissions in a CFB boiler pollutant coupling control method according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating a method for controlling contaminant coupling in a CFB boiler according to an embodiment of the present invention;
FIG. 5 shows SO in the prior art2A quantitative relation diagram of the discharge concentration and the limestone adding amount exists;
FIG. 6 is a flow chart illustrating an implementation process of a pollutant coupling control system of a CFB boiler according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background section, limestone added to the prior art for CFB furnace desulfurization is responsible for NOxThe generation of the sulfur has certain catalytic action, and the increase of the running oxygen quantity can also promote the desulfurization reaction to be carried out, SO that the SO is reduced2Emission concentration with simultaneous increase of NOxEmissions, the above-mentioned problems, present major difficulties in controlling the operation of CFB pollutant operations.
In order to solve the above technical problem, the present invention provides a method for controlling contaminant coupling of a CFB boiler, as shown in fig. 2, comprising the following steps: s1, establishing a functional relation among emission concentrations of different pollutants in the operation process of the CFB boiler, wherein the pollutants comprise sulfur dioxide and nitrogen oxides; s2, applying the function relation to the relation among the oxygen quantity, the limestone adding quantity and the pollutant emission concentration to obtain the oxygen quantity and the limestone adding quantity when the pollutant emission concentration is the lowest and recording the oxygen quantity and the limestone adding quantity as optimal values; and S3, controlling the oxygen amount and the limestone addition amount to be optimal values.
In the method for controlling the pollutant coupling of the CFB boiler, the SO of the CFB boiler is obtained2Emission concentration and NOxThe quantitative coupling relation of the emission concentration gives the optimal recommended value of the pollutant control concentration and the limestone adding amount, SO that the SO of the CFB boiler2Emission concentration and NOxThe emission concentration reaches the integral optimal value, the CFB pollutant control operation is guided, the operation intensity of operators is reduced, the calcium-sulfur ratio of desulfurization in the furnace is reduced, and the power plant is improvedAnd (4) operation economy.
An exemplary embodiment of a CFB boiler contaminant coupling control method provided in accordance with the present invention will be described in more detail below. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art.
Applicants analyzed multiple sets of SO during field testing of multiple CFB power plants2With NOxThe emission concentration variation trend shows that the emission concentration variation trend and the emission concentration variation trend have strong negative correlation, and the numerical values of the emission concentration variation trend and the emission concentration variation trend have certain quantitative relation. SO as shown in FIG. 12With NOxThe numerical changes of the emission concentration and the emission concentration are mutually coupled, the trends are opposite, and the change amplitudes have a certain proportional relation.
Then, on a 300MW CFB boiler generator set, through on-site multi-group data analysis under different loads, the pollutant emission concentration presents a certain relation, as shown in FIG. 3. And fitting a function relation between the two through data sorting to obtain:
151MW load:
C(NOx)＝-0.142C(SO2)+142.17；
load of 192 MW:
C(NOx)＝-0.122C(SO2)+132.17；
wherein, C (NO)x) Is the concentration of nitrogen oxides, C (SO)2) The emission concentration of sulfur dioxide;
it can be seen that under different load conditions, when the oxygen amount, limestone addition amount and other factors change, although the concentrations of the two factors change, a proportionality coefficient K always exists, SO that the concentration of NOx and SO obtained after the proportion is converted2The sum of the concentrations is equal to a constant M, the proportionality coefficient K and the constant M slightly change with the load, and the change range is not large, namely the following relation is provided:
C(NOx)+K×C(SO2) Wherein, C (NO)x) Is the concentration of nitrogen oxides, C (SO)2) The concentration of the discharged sulfur dioxide is.
Therefore, in step S1, as shown in fig. 4, the step of establishing the functional relationship may include: s11, establishing a first functional relation C (NO)x)+K×C(SO2) Wherein, C (NO)x) Is the concentration of nitrogen oxides, C (SO)2) The emission concentration of sulfur dioxide; s12, sulfur dioxide emission concentration and nitrogen oxide emission concentration at different time points under the same load are applied to the functional relation to obtain K and M.
In a preferred embodiment, the step S11 includes: measuring the sulfur dioxide emission concentration and the nitrogen oxide emission concentration of the CFB boiler under different loads, and drawing a relation curve; respectively carrying out data fitting on the relation curves to obtain a plurality of functional relation formulas of the sulfur dioxide emission concentration and the nitrogen oxide emission concentration; and obtaining a first functional relation according to the rule among the functional relations.
After the above step S1, step S2 is executed: and applying the functional relation to the relation among the oxygen quantity, the limestone adding quantity and the pollutant emission concentration to obtain the oxygen quantity and the limestone adding quantity when the pollutant emission concentration is the lowest and recording the oxygen quantity and the limestone adding quantity as optimal values.
Can utilize SO for a period of time under different coal combustion conditions2Emission concentration and NOxAnd (3) carrying out data on the emission concentration, inputting the data into a power plant DCS, solving the values of K and M by calculating and fitting, and applying K, M to the relation between the oxygen amount, the limestone addition amount and the pollutant emission concentration to obtain the optimal values of the operation oxygen amount and the limestone addition amount. At the same time, quantitative description of SO2Emission concentration and NOxThe mutual relation of the discharged concentration can provide reference basis for the operation of adjusting the concentration of the pollutants on site, SO that SO is ensured2Emission concentration and NOxThe discharge concentration reaches a more ideal value at the same time.
In a preferred embodiment, as shown in fig. 4, the step of obtaining the optimal values of the oxygen amount and the limestone addition amount comprises: s21, establishing a constraint condition according to the relation between the sulfur dioxide emission concentration and the nitrogen oxide emission concentration, and applying the constraint condition to the functional relation to obtain the optimal value of the sulfur dioxide emission concentration; and S22, applying the optimal value of the sulfur dioxide emission concentration to the relation among the oxygen quantity, the limestone adding quantity and the sulfur dioxide emission concentration to obtain the optimal value of the oxygen quantity and the optimal value of the limestone adding quantity.
In the circulating fluidized bed, limestone is firstly decomposed into CaO and CO in an endothermic manner2Followed by CaO and SO2Carrying out reaction to realize in-furnace desulfurization, wherein the reaction formula is as follows:
CaCO3→CaO+CO2；
CaO+1/2O2+SO2→CaSO4。
in CFB power plants, SO is typically controlled by adjusting the amount of limestone added to the furnace by controlling the frequency of the limestone feed2Emission concentration, SO2The discharge concentration and the limestone adding amount have a specific quantitative relation, as shown in figure 5; on the other hand, the limestone desulfurization requires oxygen consumption, and the oxygen consumption is increased within a certain range, SO that the desulfurization is facilitated, and the SO is reduced2Discharge of SO2There is also a quantitative relationship between the concentration of the emissions and the amount of oxygen, as shown in FIG. 1.
For controlling NO in actual operation of CFB power plantXDischarge up to standard or make NO cooperate with SNCR denitration systemXThe ultra-low emission is achieved, the combustion effect and the operation economy are considered simultaneously, and NO can be discharged from a hearthXIs controlled at 100mg/Nm3～150mg/Nm3As the above-mentioned constraint in the range, a specific numerical value C (NO)x) Each power plant can be selected and determined according to the actual operation condition on site. Then adding C (NO)x) The SO under the operation condition can be obtained by substituting the function relation determined by the invention2Target value C (SO) for optimum emission concentration2) To thereby derive the optimum recommended target value for limestone addition. Meanwhile, quantitative optimization suggestions are made for the control value of the oxygen amount in operation. Thereby achieving the effects of reducing the addition of limestone, optimizing the operation oxygen amount and improving the operation economy of the power plant.
According to another aspect of the present invention, there is also provided a CFB boiler pollutant coupling control system electrically connected to a CFB boiler power plant, the CFB boiler power plant including a CFB boiler, a pollutant discharge line in communication with the CFB boiler, and a limestone conveying system, the pollutant coupling control system further including a collection unit, a first calculation unit, a second calculation unit, and a control unit.
The collecting unit is communicated with the pollutant discharge pipeline and is used for collecting the concentration of pollutants, wherein the pollutants comprise sulfur dioxide and nitrogen oxide; the first calculating unit is electrically connected with the collecting unit and is used for establishing a functional relation among the emission concentrations of different pollutants; the second calculating unit is electrically connected with the first calculating unit and is used for applying the functional relation to the relation among the oxygen quantity, the limestone adding quantity and the pollutant emission concentration to obtain the oxygen quantity and the limestone adding quantity when the pollutant emission concentration is lowest and recording the oxygen quantity and the limestone adding quantity as optimal values; the control unit is respectively electrically connected with the CFB boiler, the limestone conveying system and the second calculation unit and is used for controlling the oxygen quantity and the limestone adding quantity at optimal values.
In the pollutant coupling control system of the CFB boiler, SO passes through the CFB boiler2Emission concentration and NOxThe quantitative coupling relation of the emission concentration gives the optimal recommended value of the pollutant control concentration and the limestone adding amount, SO that the SO of the CFB boiler2Emission concentration and NOxThe emission concentration reaches the integral optimal value, the CFB pollutant control operation is guided, the operation intensity of operators is reduced, the calcium-sulfur ratio of desulfurization in the furnace is reduced, and the operation economy of a power plant is improved.
Preferably, the first calculating unit includes a data fitting module and a first calculating module, and the data fitting module is electrically connected to the collecting unit and is used for establishing the first functional relation C (NO)x)+K×C(SO2) Wherein, C (NO)x) Is the concentration of nitrogen oxides, C (SO)2) The emission concentration of sulfur dioxide; and the first calculation module is electrically connected with the data fitting module and is used for applying the sulfur dioxide emission concentration and the nitrogen oxide emission concentration at different time points under the same load to the functional relation to obtain K and M.
Preferably, the second calculating unit includes a second calculating module and a third calculating module, the second calculating module is electrically connected to the first calculating module, and is configured to establish a constraint condition according to a relationship between the emission concentration of sulfur dioxide and the emission concentration of nitrogen oxide, and apply the constraint condition to the functional relationship, so as to obtain an optimal value of the emission concentration of sulfur dioxide; and the third calculation module is electrically connected with the second calculation module and is used for applying the optimal value of the sulfur dioxide emission concentration to the relation among the oxygen quantity, the limestone adding quantity and the sulfur dioxide emission concentration so as to obtain the optimal value of the oxygen quantity and the optimal value of the limestone adding quantity.
The CFB boiler pollutant coupling control system of the present invention may also utilize a DCS control system in the existing CFB boiler generator set, as shown in fig. 6, in which a data fitting calculation module is added, and its general formula is:
C(NOx)+K×C(SO2)＝M (1)
wherein, C (NO)x) Is the concentration of nitrogen oxides, C (SO)2) The value of the emission concentration of sulfur dioxide can be real-time valued from the existing pollutant measuring system of the power plant by substituting multiple groups of C (NO) at different timesx)、C(SO2) The data fitting calculation is carried out to obtain K, M specific values, the formula (1) is determined accordingly, and K, M specific values are K1、M1For example, this gives the NO available for that periodxWith SO2The emission concentration coupling relation of (1):
C(NOx)+K1×C(SO2)＝M1(2)
by utilizing the relational expression (2), the optimal control suggested values of the current concentration and the limestone addition amount can be obtained and then displayed in a DCS picture or input into an automatic control system, so that the optimal coupling control of the pollutants of the CFB unit is realized.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
by obtaining CFB boiler SO2Emission concentration and NOxQuantitative coupling of emission concentrationGiving out optimal recommended values of pollutant control concentration and limestone addition SO as to ensure that the CFB boiler SO2Emission concentration and NOxThe emission concentration reaches the integral optimal value, the CFB pollutant control operation is guided, the operation intensity of operators is reduced, the calcium-sulfur ratio of desulfurization in the furnace is reduced, and the operation economy of a power plant is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A pollutant coupling control method for a CFB boiler is characterized by comprising the following steps:
s1, establishing a functional relation between emission concentrations of sulfur dioxide and nitrogen oxides in pollutants during operation of the CFB boiler, wherein the pollutants comprise the sulfur dioxide and the nitrogen oxides;
s2, applying the functional relation to the relation among oxygen quantity, limestone adding quantity and pollutant emission concentration to obtain the oxygen quantity and the limestone adding quantity when the pollutant emission concentration is lowest and recording as optimal values;
and S3, controlling the oxygen amount and the limestone addition amount at the optimal value, and mutually coupling the numerical changes of the emission concentrations of the sulfur dioxide and the nitrogen oxide in the functional relation, wherein the numerical changes have opposite trends, and the change amplitudes have a certain proportional relation.
2. The CFB boiler contaminant coupling control method of claim 1, wherein the step of establishing said functional relationship comprises:
s11, establishing a first functional relation C (NO)x)+K×C(SO2) Wherein, C (NO)x) For the nitrogen oxide emission concentration, C (SO)2) The sulfur dioxide emission concentration;
s12, the sulfur dioxide emission concentration and the nitrogen oxide emission concentration at different time points under the same load are applied to the functional relation to obtain K and M.
3. The CFB boiler contaminant coupling control method of claim 2, wherein said step S11 includes:
measuring the sulfur dioxide emission concentration and the nitrogen oxide emission concentration of the CFB boiler under different loads, and drawing a relation curve;
respectively carrying out data fitting on each relation curve to obtain a plurality of functional relation formulas of the sulfur dioxide emission concentration and the nitrogen oxide emission concentration;
and obtaining the first functional relation according to the rule among the functional relations.
4. A CFB boiler contaminant coupling control method according to any one of claims 1 to 3, wherein the step of obtaining optimal values of said oxygen amount and said limestone addition amount comprises:
s21, establishing a constraint condition according to the relation between the sulfur dioxide emission concentration and the nitrogen oxide emission concentration, and applying the constraint condition to the functional relation to obtain the optimal value of the sulfur dioxide emission concentration;
and S22, applying the optimal value of the sulfur dioxide emission concentration to the relation among oxygen quantity, limestone adding quantity and the sulfur dioxide emission concentration to obtain the optimal value of the oxygen quantity and the optimal value of the limestone adding quantity.
5. The CFB boiler contaminant coupling control method of claim 4, wherein the constraints are: controlling the emission concentration of the nitrogen oxide to be 100-150 mg/Nm3。
6. A CFB boiler contaminant coupling control system electrically connected to a CFB boiler generator set, the CFB boiler generator set including a CFB boiler, a contaminant discharge line in communication with the CFB boiler, and a limestone conveyance system, the contaminant coupling control system further comprising:
a collection unit in communication with the pollutant discharge line for collecting a concentration of the pollutant, the pollutant including sulfur dioxide and nitrogen oxides;
the first calculation unit is electrically connected with the acquisition unit and is used for establishing a functional relation between the emission concentrations of the sulfur dioxide and the nitrogen oxide;
the second calculation unit is electrically connected with the first calculation unit and is used for applying the functional relation to the relation among oxygen quantity, limestone adding amount and pollutant emission concentration to obtain the oxygen quantity and the limestone adding amount when the pollutant emission concentration is lowest and recording the oxygen quantity and the limestone adding amount as optimal values;
and the control unit is respectively and electrically connected with the CFB boiler, the limestone conveying system and the second calculation unit and is used for controlling the oxygen amount and the limestone adding amount to be in the optimal value, the numerical changes of the emission concentrations of the sulfur dioxide and the nitrogen oxide in the functional relation are mutually coupled, the trends are opposite, and the change amplitudes have certain proportional relation.
7. The CFB boiler contaminant coupling control system of claim 6, wherein the first calculation unit comprises:
a data fitting module electrically connected with the acquisition unit and used for establishing a first functional relation C (NO)x)+K×C(SO2) Wherein, C (NO)x) For the nitrogen oxide emission concentration, C (SO)2) The sulfur dioxide emission concentration;
and the first calculation module is electrically connected with the data fitting module and is used for applying the sulfur dioxide emission concentration and the nitrogen oxide emission concentration at different time points under the same load to the functional relation to obtain K and M.
8. The CFB boiler contaminant coupling control system of claim 7, wherein the second calculation unit comprises:
the second calculation module is electrically connected with the first calculation module and used for establishing a constraint condition according to the relation between the sulfur dioxide emission concentration and the nitrogen oxide emission concentration and applying the constraint condition to the functional relation so as to obtain the optimal value of the sulfur dioxide emission concentration;
and the third calculation module is electrically connected with the second calculation module and is used for applying the optimal value of the sulfur dioxide emission concentration to the relation among oxygen quantity, limestone addition and the sulfur dioxide emission concentration so as to obtain the optimal value of the oxygen quantity and the optimal value of the limestone addition.
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| CN107694300A (en) * | 2016-08-08 | 2018-02-16 | 中冶长天国际工程有限责任公司 | The ammonia spraying amount control method and device of active carbon desulfurization denitrating system |
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| CN107694300A (en) * | 2016-08-08 | 2018-02-16 | 中冶长天国际工程有限责任公司 | The ammonia spraying amount control method and device of active carbon desulfurization denitrating system |
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