CN111228979A - Advanced automatic control method and control device for PSR (polymer dispersed particulate reactor) polymer denitration dosage - Google Patents
Advanced automatic control method and control device for PSR (polymer dispersed particulate reactor) polymer denitration dosage Download PDFInfo
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Abstract
An advanced automatic control method for PSR high-molecular denitration dosage comprises the following steps: step S1: acquiring the actual main steam flow and the flue gas temperature of a denitration reaction furnace mouth in the denitration reaction furnace; step S2: a feed-forward signal for a NOx governor by the main steam flow value; step S3: calculating a difference value between an actual measured value and a preset value of NOX through a PID (proportion integration differentiation) loop to obtain a corresponding PSR high-molecular spray dose; step S4, inputting the PSR high molecular spray dose value into a weighing system; obtaining the actual weight of the denitration agent through a weighing system; step S5, obtaining the numerical value of the frequency conversion loop through the PSR high molecular spray dose; the numerical value of the variable frequency loop is used for adjusting the frequency set value of the variable frequency adjusting loop of the screw feeder; after the related devices of the PSR system are controlled and optimized, the full-automatic start-stop control of the PSR system devices and the automatic control of the NOx emission concentration can be realized, and the NOx emission concentration of the tail flue of the boiler can be effectively adjusted in time.
Description
Technical Field
The invention relates to the technical field of nitrogen-containing industrial waste gas pollution treatment, in particular to an advanced automatic control method and a control device for PSR (polymer dispersed particulate reactor) high-polymer denitration dosage.
Background
The air pollution in China is serious, and according to data estimation, the main air pollutants discharged by fire coal, such as smoke dust, SO2, NOx, CO2 and the like, account for about 96 percent of the total fuel combustion discharge. Wherein, the S02 of the coal emission accounts for 87% of the total emission of various pollution sources, and the NOx accounts for 6% of the total emission of various pollution sources. SO2 and NOx are the main causes of acid rain, which is extremely harmful in different ways to aquatic ecosystems, terrestrial ecosystems, corrosive materials and to human health, and has become one of the major environmental problems facing the world. In order to solve the problem of acid rain, practical and effective measures are adopted in all countries around the world to control the emission of S02 and NOx;
the traditional denitration process is to estimate the concentration of NOx in advance, calculate the demand of the denitration agent according to the estimated value, and finally send the denitration agent into a reaction furnace through equipment for denitration reaction, but the demand of the denitration agent obtained through estimation is inaccurate, the reaction rate is influenced when the denitration agent is too little and too much, and meanwhile, different dosage of the denitration agent is required at different temperatures in the reaction process, so that how to control the usage of the denitration agent is the most urgent problem at present.
Disclosure of Invention
The invention aims to provide an advanced automatic control method and a control device for PSR high-molecular denitration dosage aiming at the defects in the background art, and solves the problems;
in order to achieve the purpose, the invention adopts the following technical scheme:
an advanced automatic control method for PSR high-molecular denitration dosage comprises the following steps:
step S1: acquiring the actual main steam flow and the flue gas temperature of a denitration reaction furnace mouth in the denitration reaction furnace; the first acquisition module is used for acquiring an NOx concentration value according to the measurement of the CEMS system and recording the NOx concentration value as a measured value.
Step S2: a feed forward signal for a NOx governor from a measurement of the main steam flow;
step S3: obtaining the corresponding PSR high-molecular spray amount through a PID loop according to the difference value between the actual measured value and the preset value of the NOX;
step S4, inputting the PSR high-molecular spray dose value into a corresponding weighing system; obtaining the actual weight of the denitration agent through the weighing system;
step S5, obtaining the numerical value of the frequency conversion loop through the PSR high molecular spray dose; the numerical value of the variable frequency loop is used for adjusting the frequency set value of the variable frequency adjusting loop of the screw feeder;
step S6, obtaining a corresponding air volume loop value through the PSR high molecular spray dose; the air volume loop numerical value is used for setting specific air volume in the denitration reaction furnace;
step S7, obtaining the working frequency of the corresponding Roots blower according to the numerical value of the air volume loop;
step S8: and obtaining a corrected value of the PSR high-polymer spray amount according to the flue gas temperature of the denitration reaction furnace mouth, wherein the corrected value is used for correcting the PSR high-polymer spray amount, and then adjusting the frequency of the variable-frequency adjusting loop through the corrected value.
Preferably, before the step S2 is executed, the steps S2 to S8 are executed according to whether the main steam flow rate and the flue gas temperature of the denitration reaction furnace mouth obtained in the step S1 reach a threshold value.
Preferably, before the step S1, a PSR macromolecule spraying amount is preset; and obtaining the corresponding preset frequency conversion loop numerical value, the preset air volume and the frequency of the frequency conversion regulating loop through the preset PSR high-molecular spray amount.
Preferably, if the difference between the preset frequency conversion loop numerical value and the frequency conversion loop numerical value or between the preset air volume loop numerical value and the air volume loop numerical value is larger than a set threshold value, the difference is converted into the frequency of the frequency conversion regulation loop of the manual screw feeder and the working frequency of the Roots blower; if the difference between the preset NOx concentration and the actual NOx concentration measurement is greater than the threshold, the NOx regulating circuit is automatically switched to manual regulation.
Preferably, the NOX concentration value is measured by a CEMS system.
An advanced automatic control device for PSR high-molecular denitration dosage comprises:
a first acquisition unit: the system is used for acquiring the main steam flow and the flue gas temperature of the denitration reaction furnace mouth;
a second acquisition unit: the method is used for obtaining specific numerical values of a feedback NOX numerical value, a PSR high-molecular spray quantity, an air quantity loop numerical value, the working frequency of the Roots blower, a frequency conversion loop numerical value and a correction value.
Preferably, the first obtaining unit includes a first obtaining module and a second obtaining module;
the first acquisition module is used for acquiring an NOX concentration value according to the measurement of the CEMS system and recording the NOX concentration value as a measurement value;
and the second acquisition module is used for acquiring the flue gas temperature of the denitration reaction furnace mouth according to the thermocouple.
Preferably, the second acquiring unit includes: the system comprises a first calculation module and a second calculation module;
a first calculation module: the system comprises a first acquisition module, a second acquisition module, a first control module and a second control module, wherein the first acquisition module is used for acquiring a main steam flow measured value of the first control module and acquiring a feed-forward numerical value of an NOX regulation loop according to the main steam flow measured value parameter;
a second calculation module: and the PSR high-molecular spray quantity control module is used for receiving the measured value of the NOX of the first acquisition module and obtaining the PSR high-molecular spray quantity through the PID loop according to the difference value between the measured value of the NOX and the preset value of the NOX.
Preferably, the second acquiring unit includes: the third calculation module and the fourth calculation module;
a third calculation module: the device is used for receiving the PSR high-molecular spray dose in the second calculation module and obtaining the numerical value of the air volume loop according to the parameter of the PSR high-molecular spray dose;
a fourth calculation module: the third calculation module is used for receiving the air volume loop value in the third calculation module and obtaining the working frequency of the Roots blower according to the parameter of the air volume loop value;
preferably, the second acquiring unit further includes: a fifth calculation module and a sixth calculation module;
a fifth calculation module: the PSR high-molecular spray quantity calculating module is used for receiving the PSR high-molecular spray quantity in the second calculating module and obtaining a numerical value of the frequency conversion loop according to parameters of the PSR high-molecular spray quantity;
a sixth calculation module: and the PSR high-molecular spray quantity correction module is used for receiving the flue gas temperature in the second acquisition module and obtaining a correction value of the PSR high-molecular spray quantity according to the flue gas temperature parameter of the denitration reaction furnace mouth.
Has the advantages that: after the control optimization is carried out on the related equipment of the PSR system, the full-automatic start-stop control of the PSR system equipment and the automatic control of the NOx emission concentration can be realized, the labor cost can be saved, and the control precision can be improved; can effectively adjust the NOX emission concentration of the tail flue of the boiler in time and ensure that the emission reaches the standard.
Drawings
The drawings are further illustrative of the invention and the content of the drawings does not constitute any limitation of the invention.
FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention;
FIG. 2 is a data flow diagram of the control method of one embodiment of the present invention determined before startup;
FIG. 3 is a flow chart of an implementation of a control method according to an embodiment of the present invention;
FIG. 4 is a line graph of main steam flow versus feed forward signal relationship at step S2;
FIG. 5 is a line graph showing the relationship between the difference between the actual NOx measured value and the preset value and the PSR high molecular weight spray in step S3;
FIG. 6 is a line graph showing the relationship between the PSR high molecular weight spraying amount and the frequency of the variable frequency regulating loop of the screw feeder in the step S5;
FIG. 7 is a line graph showing the relationship between the PSR high molecular weight spray and the air volume in step S6;
FIG. 8 is a line graph showing the relationship between the air volume and the frequency of the Roots blower in step S7;
FIG. 9 is a line graph showing the relationship between the flue gas temperature and the correction value in step S8;
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode with reference to the attached drawings 1-9.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An advanced automatic control device for PSR high-molecular denitration dosage comprises: a first obtaining unit and a second obtaining unit; as shown in fig. 1;
the first acquisition unit: the system is used for acquiring the main steam flow and the flue gas temperature of the denitration reaction furnace mouth;
the second acquisition unit: the method is used for obtaining specific numerical values of NOX feedback numerical values, PSR high-molecular spray quantity, air quantity loop numerical values, the working frequency of the Roots blower, frequency conversion loop numerical values and correction values.
The first acquisition unit is used for acquiring data of judgment conditions before the PSR high-molecular denitration dosage advanced automatic control method is started;
the second acquisition unit is used for receiving the data of the first acquisition unit; and the specific numerical values of the PSR high-molecular spray dose, the air volume loop numerical value, the working frequency of the Roots blower, the frequency conversion loop numerical value and the correction value are calculated through the data of the first acquisition unit.
Preferably, the first obtaining unit includes a first obtaining module and a second obtaining module;
preferably, the second acquiring unit includes: the device comprises a first calculation module, a second calculation module, a third calculation module, a fourth calculation module, a fifth calculation module and a sixth calculation module;
an advanced automatic control method for PSR high-molecular denitration dosage comprises the following steps: as shown in fig. 3;
step S1: acquiring the actual main steam flow and the flue gas temperature of a denitration reaction furnace mouth in the denitration reaction furnace;
the first acquisition module is used for acquiring an NOX concentration value according to the measurement of the CEMS system and recording the NOX concentration value as a measurement value;
and the second acquisition module is used for acquiring the flue gas temperature of the denitration reaction furnace mouth according to the thermocouple.
Step S2: a feed-forward signal for a NOx regulation loop via the main steam flow value;
a feedback value is obtained through a first calculation module, the first calculation module is used for receiving a measured value of the main steam flow of the first acquisition module and obtaining a feedforward value according to a measured value parameter of the main steam flow; the functional data for main steam flow for NOx trim loop feed forward values are shown in Table 1; the main steam flow is also used for judging whether the automatic control method starts one of the parameters; the measurement value is a condition for judging whether the denitration system is started; and if the measured value is lower, the denitration working system does not meet the input condition, and the automatic control system does not need to be started. The automatic control method does not need to be started until the measured value meets a certain value.
TABLE 1
Step S3: obtaining the corresponding PSR high-molecular spray amount according to the difference between the actual measured value and the preset value of the NOX;
obtaining the PSR high-molecular spray dose through a second calculation module; the second calculation module is used for receiving the NOX measured value of the first acquisition module and obtaining the PSR high-molecular spray amount according to a difference parameter between the NOX measured value and a preset value of the main steam flow; the functional relationship between the difference between the actual measured value and the preset value of the NOX and the PSR high-molecular spray amount is shown in Table 2, and the curve diagram of the relationship between the difference between the actual measured value and the preset value of the main steam flow and the PSR high-molecular spray amount is shown in FIG. 5; the preset value (SV) is an NOx emission concentration value set when the denitration working system works; said measured value (PV) is the actual NOx concentration value measured by the CEMS system; the PSR high molecular spray dose needing to be adjusted can be obtained through the Difference (DV) between the measured value and the preset value.
TABLE 2
Step S4, inputting the PSR high-molecular spray dose value into a corresponding weighing system; obtaining the actual weight of the denitration agent through the weighing system;
obtaining the PSR high-molecular spray amount needing to be adjusted through the step S3; the PSR high-molecular spray amount needing to be adjusted can be obtained through the weighing and feeding system, and the actual weight of the denitration agent needing to be adjusted can be obtained.
Step S5, obtaining the numerical value of the frequency conversion loop through the PSR high molecular spray dose; the numerical value of the variable frequency loop is used for adjusting the frequency set value of the variable frequency adjusting loop of the screw feeder;
obtaining a frequency value of a variable frequency regulation loop of the screw feeder through the fifth calculation module, wherein the fifth calculation module is used for receiving the PSR high polymer spray amount in the second calculation module and obtaining the PSR high polymer spray amount according to parameters of the PSR high polymer spray amount; the frequency function relationship between the PSR high-molecular spray dose and the screw feeder is shown in table 3, and the frequency relationship line graph between the PSR high-molecular spray dose and the variable-frequency regulation loop of the screw feeder is shown in fig. 6; the actual weight of the denitration agent after adjustment is obtained in the step S4; the invention is a control method of a compensation system, NOx in the denitration reaction is constantly changed, and the amount of a denitration agent is required to be adjusted through the real-time amount of the NOx; the actual weight of the denitrifier obtained in the step S4 is the weight of the denitrifier output by the screw feeder at a certain frequency; the weight of the needed denitration agent is changed; it is then necessary to readjust the frequency of the variable-frequency regulation loop of the screw feeder according to the weight of the denitrifier obtained in step S4.
| X coordinate | Y coordinate | ||
| Name (R) | Flow rate of spray | Frequency of feed | |
| Unit of | Kg/ | Hz | |
| 1 | 0 | 0 | |
| 2 | 5 | 3 | |
| 3 | 10 | 6 | |
| 4 | 15 | 8 | |
| 5 | 20 | 10 | |
| 6 | 25 | 13 | |
| 7 | 30 | 15 | |
| 8 | 35 | 17 | |
| 9 | 40 | 20 | |
| 10 | 45 | 23 | |
| 11 | 50 | 26 | |
| 12 | 60 | 30 |
TABLE 3
Step S6, obtaining a corresponding air volume loop value through the PSR high molecular spray dose; the air volume loop numerical value is used for setting specific air volume in the denitration reaction furnace;
obtaining specific air volume through a third calculation module; the third calculation module is used for receiving the PSR high-molecular spray dose in the second calculation module and obtaining the air volume loop value according to the parameter of the PSR high-molecular spray dose; the functional relationship between the PSR high-molecular spray dose and the air volume is shown in Table 4; a graph showing a relationship between the PSR high molecular spray amount and the air volume is shown in fig. 7, the reactor in the denitration operation system is a large operation body, and if the denitration agent needs to be sufficiently dispersed and introduced into the reactor, the denitration agent needs to be blown off by wind force and introduced into the reactor, so that the amount of the denitration agent determines the magnitude of the air volume, which varies according to the denitration agent.
TABLE 4
Step S7, obtaining the working frequency of the corresponding Roots blower according to the numerical value of the air volume loop;
the working frequency of the Roots blower is obtained through a fourth calculation module; the fourth calculation module is used for receiving the air volume loop value in the third calculation module and obtaining the working frequency of the Roots blower according to the parameter of the air volume loop value;
the functional relationship between the air quantity and the working frequency of the Roots blower is shown in Table 5, and the curve diagram of the relationship between the air quantity and the frequency of the Roots blower is shown in FIG. 8; adjusting the working frequency of the Roots blower for controlling the air quantity according to the change of the required air quantity in the step S6; and the Roots blower is used for providing air volume.
| X coordinate | Y coordinate | ||
| Name (R) | Air volume set value | Frequency of the fan | |
| Unit of | m3/ | Hz | |
| 1 | 0 | 0 | |
| 2 | 60 | 10 | |
| 3 | 70 | 13 | |
| 4 | 80 | 15 | |
| 5 | 90 | 18 | |
| 6 | 100 | 20 | |
| 7 | 200 | 25 | |
| 8 | 300 | 28 | |
| 9 | 400 | 30 | |
| 10 | 500 | 34 | |
| 11 | 600 | 37 | |
| 12 | 700 | 40 |
TABLE 5
Step S8: and the variable-frequency regulating loop obtains a corrected value of the PSR high-polymer spray amount according to the flue gas temperature of the denitration reaction furnace mouth, the corrected value is used for correcting the PSR high-polymer spray amount, and then the frequency of the variable-frequency regulating loop is regulated through the corrected value.
And obtaining a correction value through a sixth calculation module, wherein the sixth calculation module is used for receiving the flue gas temperature in the second acquisition module and obtaining the correction value of the PSR high-molecular spray amount according to the parameters of the flue gas temperature of the denitration reaction furnace mouth.
The functional relationship between the flue gas temperature and the correction value is shown in table 6; the relationship line graph of the flue gas temperature and the correction value is shown in FIG. 9; temperature is also one of the factors affecting the reaction rate of the denitrating agent; so the final weight correction is carried out on the denitrifier according to the flue gas temperature at the intersection of the reaction furnace; meanwhile, the temperature is also one of the judgment conditions for the input of the PSR denitration system, and the temperature and the main steam flow jointly judge whether the PSR system is started or not.
| X coordinate | Y coordinate | |
| Name (R) | Temperature of flue gas | Spray correction value |
| Unit of | m3/h | Kg/ |
| 1 | 800 | 0 |
| 2 | 850 | 0 |
| 3 | 860 | 1 |
| 4 | 870 | 2 |
| 5 | 880 | 3 |
| 6 | 890 | 4 |
| 7 | 900 | 5 |
| 8 | 920 | 7 |
| 9 | 940 | 8 |
| 10 | 960 | 9 |
| 11 | 980 | 10 |
| 12 | 1000 | 10 |
TABLE 6
Preferably, before the step S2 is executed, it is determined whether to execute the steps S2 to S8 according to the main steam flow rate and the flue gas temperature of the denitration reaction furnace mouth obtained in the step S1, as shown in fig. 2
The main steam flow as in said step S2 is a feed forward signal as a NOX governor; if the judgment value of the flow of the main steam flow is determined by the specific size of the reaction furnace, no clear limitation is made in the invention, and when the main steam flow meets the corresponding amount, whether the flue gas temperature reaches the threshold temperature or not is judged. The threshold temperature of the flue gas temperature is 850 ℃, because the temperature is 850 ℃; the denitration agent in the reaction furnace can fully react, the reaction rate is improved, and as shown in fig. 2, when the temperature is lower than 850 ℃, the denitration agent in the reaction furnace is not fully reacted, so that the advanced automatic control method for the PSR high-molecular denitration dosage needs to be started when the main steam flow and the flue gas temperature simultaneously meet corresponding conditions.
Preferably, before the step S1, a PSR macromolecule spraying amount is preset; and obtaining the corresponding preset frequency conversion loop numerical value, the preset air volume and the frequency of the frequency conversion regulating loop through the preset PSR high-molecular spray amount.
The working personnel need to pre-adjust the concentration of NOX before starting the advanced automatic control method of the PSR polymer denitration dosage, the deviation between the actual measurement concentration value of NOX measured by the CEMS system and the preset value passes through the PID loop, the required PSR polymer spray dosage is calculated, then the preset frequency conversion loop value, the preset air volume and the frequency of the frequency conversion adjusting loop are calculated through the PSR polymer spray dosage, and automatic adjustment and setting are carried out. When the deviation between the set value and the process value of any regulating loop is large, the regulating loop is automatically switched to manual regulation, if the regulating loop is not switched to manual regulation, an overlarge difference value causes that the integral of the calculation function in the step S3 and the subsequent steps is saturated, and the integral saturation indicates that the calculation of an executing mechanism for executing calculation of the corresponding value reaches the limit; if the deviation cannot be eliminated, the difference value is increased and increased because of the integration effect, although the operation result obtained by the pipe function is increased or decreased, the actuator has no corresponding action.
Preferably, if the difference between the preset frequency conversion loop numerical value and the frequency conversion loop numerical value or between the preset air volume loop numerical value and the air volume loop numerical value is too large, the frequency is converted into the frequency of the frequency conversion adjusting loop of the manual adjusting screw feeder and the working frequency of the Roots blower.
Two situations exist when the difference between the preset frequency conversion loop numerical value and the frequency conversion loop numerical value or between the preset air volume loop numerical value and the air volume loop numerical value is too large; one is that there is a large difference between the calculated preset value and the measured value; and the other is that the working condition mutation occurs in the denitration working system. If the advanced automatic control method for the PSR polymer denitration dosage cannot judge which condition occurs, the advanced automatic control method for the PSR polymer denitration dosage is continuously used for automatic adjustment; if a large difference exists between the preset value and the measured value, the integral of the function is saturated as a result; in case of abrupt working condition, the risk of working may occur, and both of them are big problems and need attention.
Preferably, the measured NOX concentration value is measured by a CEMS system.
CEMS is an abbreviation for Continuous Emission Monitoring System, and can monitor the concentration and total Emission of gaseous pollutants SO2, NOx, CO2, and the like. CEMS is mainly used for measuring flue gas velocity, flue gas temperature, flue gas pressure, flue gas oxygen content, flue gas humidity etc. for the calculation of emission total amount and the conversion of relevant concentration calculate NOx concentration, CEMS has little influence to moisture, dust, and the connection of flue gas detector and gas chamber has adopted the light borer to connect, makes like this change convenience and maintenance cost than lower advantage.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. An advanced automatic control method for PSR high-molecular denitration dosage is characterized by comprising the following steps:
step S1: acquiring the actual main steam flow and the flue gas temperature of a denitration reaction furnace mouth in the denitration reaction furnace;
step S2: deriving a feed-forward signal for a NOx governor from an actual measurement of NOx in the main steam flow;
step S3: obtaining the corresponding PSR high-molecular spray amount according to the difference between the actual measured value and the preset value of the NOX;
step S4, inputting the PSR high-molecular spray dose value into a corresponding weighing system; obtaining the actual weight of the denitration agent through the weighing system;
step S5, obtaining the numerical value of the frequency conversion loop through the PSR high molecular spray dose; the numerical value of the variable frequency loop is used for adjusting the frequency set value of the variable frequency adjusting loop of the screw feeder;
step S6, obtaining a corresponding air volume loop value through the PSR high molecular spray dose; the air volume loop numerical value is used for setting specific air volume in the denitration reaction furnace;
step S7, obtaining the working frequency of the corresponding Roots blower according to the numerical value of the air volume loop;
step S8: and the NOX regulating circuit obtains a corrected value of the PSR high-molecular spray amount according to the flue gas temperature of the denitration reaction furnace mouth, the corrected value is used for correcting the PSR high-molecular spray amount, and the frequency of the variable-frequency regulating circuit is regulated through the corrected value.
2. The advanced automatic control method for the denitration dosage of the PSR polymer as claimed in claim 1, wherein:
before the step S2 is executed, according to whether the main steam flow rate and the flue gas temperature of the denitration reaction furnace mouth obtained in the step S1 reach a threshold, if the threshold is reached, the steps S2 to S8 are executed.
3. The advanced automatic control method for the denitration dosage of the PSR polymer as claimed in claim 1, wherein:
presetting a PSR high-molecular spray dose before the step S1; and obtaining the corresponding preset frequency conversion loop numerical value, the preset air volume and the frequency of the frequency conversion regulating loop through the preset PSR high-molecular spray amount.
4. The advanced automatic control method for the denitration dosage of the PSR polymer as claimed in claim 3, wherein:
if the difference value between the preset frequency conversion loop numerical value and the frequency conversion loop numerical value or between the preset air volume loop numerical value and the air volume loop numerical value is larger than the set threshold value, converting automatic adjustment into manual adjustment of the frequency conversion adjustment loop of the screw feeder and the working frequency of the Roots blower; and if the difference value between the preset NOx concentration and the actual NOx concentration measured value is larger than the set threshold value, automatically switching the NOx adjusting circuit into manual adjustment.
5. The advanced automatic control method for the denitration dosage of the PSR polymer as claimed in claim 1, wherein:
the NOX concentration value is measured by the CEMS system.
6. The utility model provides an advance automatic control device of dosage for PSR polymer denitration which characterized in that includes:
a first acquisition unit: the system is used for acquiring the main steam flow and the flue gas temperature of the denitration reaction furnace mouth;
a second acquisition unit: the method is used for obtaining specific numerical values of NOX feedback numerical values, PSR high-molecular spray quantity, air quantity loop numerical values, the working frequency of the Roots blower, frequency conversion loop numerical values and correction values.
7. The advanced automatic control device for the denitration dosage of the PSR polymer as claimed in claim 6, wherein:
the first acquisition unit comprises a first acquisition module and a second acquisition module;
the first acquisition module is used for acquiring an NOX concentration value according to the measurement of the CEMS system and recording the NOX concentration value as a measurement value;
and the second acquisition module is used for acquiring the flue gas temperature of the denitration reaction furnace mouth according to the thermocouple.
8. The advanced automatic control device for the denitration dosage of the PSR polymer as claimed in claim 6, wherein:
the second acquisition unit includes: the system comprises a first calculation module and a second calculation module;
a first calculation module: the system comprises a first acquisition module, a second acquisition module, a first control module and a second control module, wherein the first acquisition module is used for acquiring a main steam flow measured value of the first control module and acquiring a feed-forward numerical value of an NOX regulation loop according to the main steam flow measured value parameter;
a second calculation module: and the system is used for receiving the NOx measured value of the first acquisition module and obtaining the PSR high molecular injection quantity through the PID loop according to the difference value between the NOx measured value and the NOx precalculated value.
9. The advanced automatic control device for the denitration dosage of the PSR polymer as claimed in claim 6, wherein:
the second acquisition unit includes: the third calculation module and the fourth calculation module;
a third calculation module: the device is used for receiving the PSR high-molecular spray dose in the second calculation module and obtaining the numerical value of the air volume loop according to the parameter of the PSR high-molecular spray dose;
a fourth calculation module: and the third calculation module is used for receiving the numerical value of the air volume loop in the third calculation module and obtaining the working frequency of the Roots blower according to the parameter of the numerical value of the air volume loop.
10. The advanced automatic control device for the denitration dosage of the PSR polymer as claimed in claim 6, wherein:
the second acquisition unit further includes: a fifth calculation module and a sixth calculation module;
a fifth calculation module: the PSR high-molecular spray quantity calculating module is used for receiving the PSR high-molecular spray quantity in the second calculating module and obtaining a numerical value of the frequency conversion loop according to parameters of the PSR high-molecular spray quantity;
a sixth calculation module: and the PSR high-molecular spray quantity correction module is used for receiving the flue gas temperature in the second acquisition module and obtaining a correction value of the PSR high-molecular spray quantity according to the flue gas temperature parameter of the denitration reaction furnace mouth.
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