Accurate denitration integration method and system for coal power peak regulation unit

Abstract

The present application relates to a kind of coal electricity peak shaving unit precision denitration integrated method and system, it is related to the field of precision denitration, it includes, obtaining the operating data in the process of boiler variable load, operating data include boiler load, NOx Concentration, flue gas flow distribution data, current ammonia injection amount, ammonia escape concentration and current angle of deflector;According to operating data, predict the deviation of denitration ammonia demand and generate ammonia production linkage instruction, calculate the positive ammonia injection correction amount of each ammonia injection subarea and the increase injection adjustment margin;When increase injection adjustment margin meets the demand, generate subarea ammonia injection linkage instruction, when there is target ammonia injection subarea, generate deflector angle linkage instruction in combination with subarea mismatch information, ammonia escape concentration and current angle of deflector, and limit to improve total ammonia injection amount when ammonia escape concentration reaches early warning threshold, to regulate ammonia production, subarea ammonia injection and deflector angle in linkage.This application has the effect of improving ammonia utilization.

Description

Technical Field

[0001] This invention relates to the field of precision denitrification, and in particular to an integrated method and system for precision denitrification in coal-fired power peak-shaving units. Background Technology

[0002] During deep peak shaving and rapid load change operations, the boiler load, flue gas flow rate, NOx concentration, and flue gas flow field of coal-fired power units fluctuate with the operating conditions. Selective catalytic reduction (CCR) denitrification systems typically reduce NOx emissions by injecting ammonia into the flue gas to react with NOx.

[0003] Existing denitrification systems typically adjust the ammonia production or injection rate based on parameters such as boiler load, NOx concentration, and flue gas flow rate to adapt to changes in unit operating conditions.

[0004] However, during variable load processes, flue gas flow distribution and NOx concentration distribution are prone to fluctuations, causing a mismatch between ammonia supply and local denitrification demand, resulting in insufficient ammonia utilization. Summary of the Invention

[0005] To improve the utilization rate of ammonia, this invention provides an integrated method and system for precise denitrification in coal-fired power peak-shaving units.

[0006] In a first aspect, the present invention provides an integrated method for precise denitrification of coal-fired power peak-shaving units, employing the following technical solution: An integrated method for precise denitrification in coal-fired power peak-shaving units includes: Acquire operating data during boiler load changes; The deviation in ammonia demand for denitrification within a preset time period is determined based on the operational data, and an ammonia production linkage instruction is generated based on the deviation in ammonia demand for denitrification and the preset lag time for ammonia production from urea hydrolysis. The positive ammonia injection correction amount for each ammonia injection zone is determined based on the operating data, and the additional injection adjustment margin for each ammonia injection zone is determined based on the current ammonia injection amount and the preset upper limit of the ammonia injection amount. When the positive ammonia injection correction amount of the ammonia injection zone does not exceed the corresponding increase injection adjustment margin, a zone ammonia injection linkage command is generated to adjust the ammonia injection amount of the ammonia injection zone. When there is a target ammonia injection zone where the positive ammonia injection correction exceeds the corresponding increase injection adjustment margin, a guide vane angle linkage command is generated based on the zone mismatch information between the target ammonia injection zone and the adjacent ammonia injection zone, the ammonia escape concentration, and the current angle of the guide vane. Among them, when the ammonia escape concentration reaches the preset ammonia escape warning threshold, the increase in the total ammonia injection is restricted. Adjust the ammonia production parameters according to the ammonia production linkage command, adjust the ammonia injection volume of each ammonia injection zone according to the zone ammonia injection linkage command, and adjust the guide plate angle according to the guide plate angle linkage command.

[0007] By adopting the above technical solution, during the boiler load change process, the deviation of future denitrification ammonia demand, the correction amount of each ammonia injection zone and the margin for additional injection can be determined based on the operating data, and the states that can be increased and are restricted can be distinguished. When there is a margin in a zone, local ammonia injection correction is performed. When the margin is exceeded, linkage adjustment is performed by combining mismatch information, ammonia escape concentration and guide plate angle to reduce simple additional injection, and the total ammonia injection amount is limited when ammonia escape reaches the warning level, thereby improving the utilization rate of ammonia.

[0008] Optionally, methods for generating deflector angle linkage commands include: Determine the partition mismatch information between the target ammonia injection zone and adjacent ammonia injection zones; The amount of ammonia injection exceeding the limit in the target ammonia injection zone is determined based on the difference between the positive ammonia injection correction amount and the corresponding increase injection adjustment margin. From the ammonia injection zones adjacent to the target ammonia injection zone, determine the candidate adjacent ammonia injection zones with increased injection adjustment margin; The deflection direction of the guide vane is determined based on the NOx concentration difference and flue gas flow rate difference between the target ammonia injection zone and the candidate adjacent ammonia injection zones. The initial angle correction amount is determined based on the ratio of the excess ammonia injection amount to the increase injection adjustment margin of the candidate adjacent ammonia injection zones. Based on the difference in flue gas flow between the target ammonia injection zone and the candidate adjacent ammonia injection zone, the initial angle correction amount is adjusted by increasing or decreasing to obtain the angle correction amount to be executed. The target angle is determined based on the deflection direction and the preset angle limit of the guide vane; Generate a guide vane angle linkage command based on the target angle and the current angle of the guide vane.

[0009] By adopting the above technical solution, when the positive ammonia injection correction amount of the target ammonia injection zone exceeds its injection adjustment margin, the deflection direction and angle correction amount of the guide vane can be determined by combining the NOx concentration difference, flue gas flow difference and the injection adjustment margin of the candidate adjacent ammonia injection zones. This ensures that the guide vane adjustment matches the ammonia injection over-limit state and the capacity of the adjacent zones, thereby reducing the problem of increased ammonia consumption caused by increased ammonia injection amount.

[0010] Optionally, after generating the deflector angle linkage command, before executing the deflector angle linkage command, the method further includes: The flue gas flow rate change of the target ammonia injection zone and the candidate adjacent ammonia injection zone is predicted based on the pre-established guide vane angle correction amount. Based on the change in flue gas flow rate of the target ammonia injection zone, recalculate the positive ammonia injection correction amount for the target ammonia injection zone; Based on the change in flue gas flow rate of the candidate adjacent ammonia injection zone, the positive ammonia injection correction amount of the candidate adjacent ammonia injection zone is recalculated, and it is determined whether the positive ammonia injection correction amount of the recalculated candidate adjacent ammonia injection zone exceeds its injection adjustment margin. If the recalculated forward ammonia injection correction amount still exceeds the injection adjustment margin, the angle correction amount is increased within the preset angle limit of the guide vane, and the guide vane angle linkage command is regenerated based on the increased angle correction amount. If the positive ammonia injection correction amount of the candidate adjacent ammonia injection zone after recalculation exceeds its injection adjustment margin, then a supplementary zone with injection adjustment margin is determined from other adjacent ammonia injection zones, and the supplementary zone is used as a new candidate adjacent ammonia injection zone to regenerate the guide vane angle linkage command. If the forward ammonia injection correction amount of the recalculated target ammonia injection zone falls back to within the corresponding injection adjustment margin, and the forward ammonia injection correction amount of the recalculated candidate adjacent ammonia injection zone does not exceed its injection adjustment margin, then the guide vane angle linkage command is executed.

[0011] By adopting the above technical solution, the impact of angle adjustment on the target ammonia injection zone and the candidate adjacent ammonia injection zone can be predicted before the baffle angle linkage command is executed, and the ammonia injection correction status of the two can be re-verified; when the target zone still does not alleviate the problem or the candidate adjacent zone is not fully supported, the angle can be corrected in time or the supplementary zone can be replaced, thereby reducing the problem of increased ammonia consumption caused by blindly increasing injection.

[0012] Optionally, when the ammonia slip concentration reaches a preset ammonia slip warning threshold and limits the increase in total ammonia injection, and the positive ammonia injection correction amount of the target ammonia injection zone exceeds the corresponding injection adjustment margin, the method for generating the guide vane angle linkage command further includes: Based on operational data, determine the risk path of ammonia blending between the target ammonia injection zone and at least one candidate ammonia-rich injection zone; Based on the NOx concentration, flue gas flow rate, and injection margin of the intermediate ammonia injection zone in the rich ammonia blending risk path, the intermediate ammonia snatching risk and ammonia escape amplification risk in the rich ammonia blending risk path are determined. When there is a risk of ammonia snatching or ammonia escape amplification in the rich ammonia blending risk path, an isolation type guide vane angle linkage command is generated to reduce the amount of flue gas exchange between the candidate rich ammonia injection zone and the target ammonia injection zone. Based on the predicted flue gas flow rate of the target ammonia injection zone after the execution of the path-isolated guide vane angle linkage command, the positive ammonia injection correction amount of the target ammonia injection zone is recalculated. When the recalculated positive ammonia injection correction amount still exceeds the injection adjustment margin, a localized deflector angle linkage command is generated based on the flue gas flow difference between the target ammonia injection zone and the adjacent ammonia injection zone, as well as the injection adjustment margin of the adjacent ammonia injection zone. This command is used to transfer part of the flue gas load of the target ammonia injection zone to the adjacent ammonia injection zone.

[0013] By adopting the above technical solution, when the total ammonia injection is limited and the injection capacity of the target ammonia injection zone is insufficient, it is possible to identify the risk path of ammonia-rich mixing and isolate the path when there is a risk of ammonia snatching or ammonia escape amplification. If the target zone is still not relieved after isolation, part of the flue gas load is transferred to an adjacent zone with injection margin, thereby reducing the risk of ammonia escape amplification or injection shortage caused by ammonia-rich mixing and reducing the problem of increased ammonia consumption caused by continued injection.

[0014] Optionally, methods for determining the intermediate ammonia grabbing risk and ammonia slip amplification risk of the ammonia-rich blending risk pathway include: The amount of ammonia injection exceeding the limit in the target ammonia injection zone is determined based on the difference between the positive ammonia injection correction amount and the corresponding increase injection adjustment margin. Based on the current ammonia injection rate, NOx concentration, and flue gas flow rate of the candidate ammonia-rich injection zone, the excess ammonia amount of the candidate ammonia-rich injection zone is determined, and whether the excess ammonia amount is allowed to be released is determined based on the comparison between the ammonia escape concentration and the ammonia escape warning threshold. The amount of ammonia consumed in the relay ammonia injection zone is determined based on the deviation of the NOx concentration in the relay ammonia injection zone from the target NOx concentration, the flue gas flow rate in the relay ammonia injection zone, and the conversion factor of the denitrification ammonia amount. The relay transmission rate is determined based on the amount of releasable surplus ammonia entering the relay ammonia injection zone, the relay ammonia consumption, and the flue gas exchange flow rate between the relay ammonia injection zone and the adjacent next-level ammonia injection zone. When the relay transmission volume calculated step by step along the ammonia-rich blending risk path is less than the ammonia injection limit of the target ammonia injection zone, it is determined that there is a risk of insufficient compensation in the ammonia-rich blending risk path. When the injection adjustment margin of any relay ammonia injection zone is less than the corresponding relay ammonia consumption, or when the positive ammonia injection correction amount of any relay ammonia injection zone after considering the relay ammonia consumption exceeds the corresponding injection adjustment margin, it is determined that there is a risk of relay ammonia snatching in the rich ammonia mixing risk path. When the amount of releasable surplus ammonia in the candidate ammonia-rich injection zone is greater than the ammonia injection limit in the target ammonia injection zone, and the difference between the ammonia escape concentration at the denitrification outlet and the ammonia escape warning threshold is less than the preset safety margin, it is determined that there is a risk of ammonia escape amplification in the ammonia-rich mixing risk path.

[0015] By adopting the above technical solution, the excess amount of ammonia injected into the target ammonia injection zone can be used as a benchmark. Combined with the amount of releaseable surplus ammonia in the candidate ammonia-rich injection zone, the amount of ammonia consumed in the relay injection zone, and the amount of ammonia transmitted through the relay, the risk path of ammonia mixing can be judged step by step. This can identify the risks of insufficient compensation, relay ammonia grabbing, and ammonia escape amplification, thereby reducing the problems of local ammonia deficiency transfer and increased ammonia consumption.

[0016] Optionally, methods for generating path-isolated deflector angle linkage commands include: Based on the adjacency relationship between candidate rich ammonia injection zones, relay ammonia injection zones and target ammonia injection zones in the rich ammonia blending risk path, the target guide plate affected by the rich ammonia blending risk path is determined. Based on the current angle of the target guide vane, the angle limit of the target guide vane, and the preset single adjustment step size, determine the angle correction direction and angle correction amount for reducing the amount of flue gas exchange on the path to reduce the risk of ammonia blending. Based on the angle correction direction and angle correction amount, generate path-isolated guide vane angle linkage commands; Based on the pre-established mapping relationship between the guide vane angle and the change in flue gas flow rate of each ammonia injection zone, the predicted flue gas flow rate of the target ammonia injection zone after the execution of the path-isolated guide vane angle linkage command is predicted. Based on the predicted flue gas flow rate of the target ammonia injection zone, recalculate the positive ammonia injection correction amount for the target ammonia injection zone; When the recalculated positive ammonia injection correction still exceeds the injection adjustment margin, a guide vane angle linkage command is generated based on the flue gas flow difference between the target ammonia injection zone and the adjacent ammonia injection zone, the injection adjustment margin of the adjacent ammonia injection zone, and the current angle of the guide vane. This command is used to reduce the flue gas flow of the target ammonia injection zone or to transfer part of the flue gas load of the target ammonia injection zone to the adjacent ammonia injection zone with the injection adjustment margin. This command is a localized load reduction type guide vane angle linkage command.

[0017] By adopting the above technical solution, the target guide vane can be determined according to the risk path of rich ammonia mixing, and a path isolation type guide vane angle linkage command can be generated by combining the current angle of the guide vane, the angle limit and the single adjustment step size, so as to reduce the amount of flue gas exchange on the risk path; if the target zone is still not relieved after isolation, a local load reduction type guide vane angle linkage command can be further generated, thereby reducing the increase in ammonia consumption caused by continued injection.

[0018] Optionally, after generating the baffle angle linkage command and before adjusting the ammonia production parameters according to the ammonia production linkage command, the following steps are also included: Based on the preset urea hydrolysis ammonia production lag time, determine the ammonia production response arrival time corresponding to the ammonia production linkage command; Based on the reduction amount of NOx load in the target ammonia injection zone between the current time and the ammonia production response time, according to the baffle angle linkage command, the equivalent ammonia reduction amount within the lag compensation window is determined. The amount of ammonia demand not covered is determined based on the deviation in ammonia demand for denitrification and the equivalent ammonia reduction within the delayed compensation window. When the amount of uncovered ammonia demand is less than or equal to the preset uncovered threshold, the ammonia increase adjustment in the ammonia production linkage command is stopped. When the uncovered ammonia demand exceeds the preset uncovered threshold, the ammonia production increment in the ammonia production linkage command is adjusted according to the uncovered ammonia demand. When the ammonia escape concentration reaches the preset ammonia escape warning threshold, the execution time of the ammonia increase adjustment content in the ammonia production linkage command is delayed, or the ammonia production increment or ammonia change rate in the ammonia production linkage command is reduced.

[0019] By adopting the above technical solution, the NOx load reduction generated by the baffle plate adjustment within the ammonia production lag window can be converted into an equivalent ammonia reduction before the ammonia production regulation is executed. Based on this, the ammonia production increase regulation can be corrected, stopped, or delayed, thus preventing the ammonia production system from continuing to increase ammonia according to the original demand after the baffle plate has formed compensation, thereby reducing the excessive ammonia injection caused by the ammonia production response lag.

[0020] Optionally, methods for determining the forward ammonia injection correction amount for each ammonia injection zone include: Based on the NOx concentration and flue gas flow distribution data of each ammonia injection zone, determine the required ammonia injection amount for denitrification in each zone. The initial ammonia injection correction amount for each ammonia injection zone is determined based on the difference between the required ammonia injection amount for denitrification in each zone and the current ammonia injection amount. Candidate ammonia-deficient zones are determined from each ammonia injection zone based on the initial ammonia injection correction amount, zone NOx concentration, target NOx concentration, and NOx concentration change slope. When the proportion of the number of candidate ammonia-deficient zones to the total number of ammonia injection zones reaches the preset ammonia deficiency ratio threshold, a total ammonia deficiency state is determined to exist. When there is a total ammonia deficiency, the initial ammonia injection correction amount of each candidate ammonia deficiency zone is proportionally corrected according to the deviation of ammonia demand for denitrification, so as to obtain the positive ammonia injection correction amount of each candidate ammonia deficiency zone. When the initial ammonia injection correction amount of the target ammonia injection zone is positive, and the initial ammonia injection correction amount of at least one adjacent ammonia injection zone is negative or less than the preset correction threshold, it is determined that there is a distributed mismatch state. When a distributed mismatch exists, the initial ammonia injection correction amount of the target ammonia injection zone is determined as the positive ammonia injection correction amount of the target ammonia injection zone, and the total ammonia injection increment control generated based on the denitrification ammonia demand deviation is suspended or delayed. The guide vane angle linkage command is generated first based on the zone mismatch information between the target ammonia injection zone and the adjacent ammonia injection zones.

[0021] By adopting the above technical solution, the positive ammonia injection correction amount can be determined according to the denitrification requirements and current ammonia injection status of each ammonia injection zone, and the total ammonia deficiency and the distribution mismatch can be distinguished. When the total ammonia deficiency occurs, the correction is made proportionally according to the deviation of the denitrification ammonia demand. When the distribution mismatch occurs, the total ammonia injection amount is adjusted by linkage through the guide plate rather than directly increasing the total ammonia injection amount, thereby reducing the problem of increased ammonia consumption caused by blindly increasing the injection.

[0022] Optionally, when the criteria for determining both total ammonia deficiency and distribution mismatch are simultaneously met, the following additional criteria may be included: The proportion of candidate ammonia-deficient zones, the sum of the initial ammonia injection correction for each candidate ammonia-deficient zone, and the deviation of ammonia demand for denitrification are normalized respectively, and the total ammonia deficiency index is determined based on the preset total ammonia deficiency weight. The differences in initial ammonia injection correction amount, NOx concentration, and flue gas flow rate between the target ammonia injection zone and adjacent ammonia injection zones are normalized respectively, and the distribution mismatch index is determined based on the preset distribution mismatch weight. When the distribution mismatch index is greater than the total ammonia deficiency index, the distribution mismatch control is prioritized, and the total ammonia injection increment control generated based on the denitrification ammonia demand deviation is suspended or postponed. The guide vane angle linkage command is generated based on the partition mismatch information between the target ammonia injection partition and the adjacent ammonia injection partition. When the total ammonia deficiency index is greater than or equal to the distribution mismatch index, the total ammonia deficiency control is prioritized, and ammonia production linkage instructions are generated or maintained based on the deviation of ammonia demand for denitrification.

[0023] By adopting the above technical solution, when total ammonia deficiency and distribution mismatch coexist, the priority control direction can be determined based on the total ammonia deficiency index and the distribution mismatch index, and it can be distinguished whether to implement ammonia production linkage or baffle adjustment. This avoids misjudging local distribution mismatch as overall ammonia deficiency and reduces the problem of increased ammonia consumption caused by blindly increasing the total ammonia injection.

[0024] Secondly, this invention provides an integrated precision denitrification system for coal-fired power peak-shaving units, employing the following technical solution: An integrated precision denitrification system for coal-fired power peak-shaving units includes: The memory stores a program for a control method for precise denitrification integration of a coal-fired power peak-shaving unit as described in any one of the above-mentioned methods; The processor loads and executes programs stored in memory.

[0025] By adopting the above technical solution, a precise denitrification integrated method for coal-fired power peak-shaving units is executed by the processor in the memory, thereby reducing the amount of ammonia injected, which can easily lead to an increase in ammonia consumption.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: 1. By combining ammonia production linkage, zoned ammonia injection linkage and guide plate angle linkage, the ammonia production lag, zoned ammonia injection capacity and ammonia escape constraint can be taken into account simultaneously during boiler load change, so that denitrification regulation no longer depends solely on increasing the total ammonia injection amount, and the ammonia utilization level under load change conditions is improved. 2. When the target ammonia injection zone is limited, by introducing candidate adjacent ammonia injection zones, ammonia injection over-limit, initial angle correction, angle correction to be executed, and target angle, the baffle adjustment can correspond to the receiving capacity of adjacent zones, reducing the situation of insufficient or excessive ammonia injection in local zones. 3. By identifying the risk path of ammonia-rich mixing when the ammonia escape concentration reaches the warning threshold and the target ammonia injection zone still exceeds the limit, and by isolating the path or reducing the load locally according to the risk of relay ammonia grabbing and the risk of ammonia escape amplification, the risk of ammonia escape amplification caused by the continued mixing of ammonia-rich flue gas can be reduced. Attached Figure Description

[0027] Figure 1 This is a scenario application diagram of a precise denitrification integrated method for coal-fired power peak-shaving units; Figure 2 This is a flowchart of a method for precise denitrification integration in coal-fired power peak-shaving units; Figure 3 This is a flowchart of the method for generating the guide vane angle linkage command. Detailed Implementation

[0028] This invention discloses an integrated method for precise denitrification of coal-fired power peak-shaving units.

[0029] Reference Figure 1 and Figure 2 An integrated method for precise denitrification in coal-fired power peak-shaving units includes: S100: Acquire operating data during boiler load changes. The operating data includes boiler load, NOx concentration, flue gas flow distribution data, current ammonia injection rate of each ammonia injection zone, ammonia escape concentration at the denitrification outlet, and current angle of the guide vane. The NOx concentration includes the zone NOx concentration corresponding to each ammonia injection zone.

[0030] Operational data refers to the set of data characterizing the operating status and adjustment conditions of the denitrification system during boiler load changes. Boiler load refers to the operating load of the boiler at the current moment. It is obtained by collecting the current main steam flow rate through a steam flow meter installed on the main steam pipeline and calculating the ratio of the current main steam flow rate to the rated main steam flow rate of the boiler under rated operating conditions.

[0031] NOx concentration refers to the concentration of nitrogen oxides in flue gas. The flue section is divided into multiple ammonia injection zones according to the arrangement of ammonia injection branches or ammonia injection grids, and flue gas NOx analyzers are set at the flue gas detection positions corresponding to each ammonia injection zone to collect the zone NOx concentration.

[0032] Flue gas flow distribution data refers to the proportion of flue gas flow in the corresponding flue gas area of ​​each ammonia injection zone. Flue gas velocity is collected by velocity detection devices set at the corresponding flue gas duct detection positions of each ammonia injection zone. The flue gas flow rate of each ammonia injection zone is determined by multiplying the flue gas flow rate of each ammonia injection zone by the corresponding flue gas duct cross-sectional area. Then, the flue gas flow distribution data is determined based on the ratio of flue gas flow rate of each ammonia injection zone to the total flue gas flow rate.

[0033] The current ammonia injection rate refers to the actual ammonia flow rate injected into the flue of each ammonia injection zone at the current moment. The actual ammonia flow rate collected by the ammonia injection flow rate detection device set on each ammonia injection branch is used as the current ammonia injection rate of the corresponding ammonia injection zone.

[0034] Ammonia slip concentration refers to the concentration of ammonia in the flue gas at the outlet of the denitrification reactor that did not participate in the denitrification reaction. It is obtained by collecting ammonia slip concentration detection devices installed on the flue gas duct at the outlet side of the denitrification reactor. The current angle of the guide plate refers to the current deflection angle of the guide plate relative to a preset reference angle. An angle detection device is installed on the guide plate's rotation axis, and the amount of deflection of the guide plate relative to its initial installation position is collected by the angle detection device as the current angle of the guide plate.

[0035] S101: Determine the deviation of ammonia demand for denitrification within a preset time period based on the operating data, and generate an ammonia production linkage command based on the deviation of ammonia demand for denitrification and the preset lag time for ammonia production by urea hydrolysis.

[0036] The preset time period refers to the predicted time window starting from the current sampling time. The preset urea hydrolysis ammonia production lag time refers to the time elapsed from the issuance of the ammonia production adjustment command to the effective change in the ammonia output of the ammonia production system. The denitrification ammonia demand deviation refers to the difference between the theoretical ammonia injection amount required to achieve the target NOx concentration within the preset time period and the currently available ammonia injection amount. The ammonia production linkage command refers to the control command used to adjust the operating parameters of the urea hydrolysis ammonia production equipment, which includes at least one of ammonia production increment, execution time, and ammonia production change rate.

[0037] Compare the NOx concentration of the zone at the current sampling time with that at the previous sampling time. Subtract the NOx concentration of the zone at the previous sampling time from the current NOx concentration and divide by the time interval to obtain the slope of the NOx concentration change. Multiply the slope of the NOx concentration change by the time interval and add it to the current NOx concentration to obtain the predicted NOx concentration. Then, based on the difference between the predicted NOx concentration and the target NOx concentration, multiply it sequentially by the flue gas flow rate of the ammonia injection zone and the preset conversion factor for denitrification ammonia quantity to determine the theoretical ammonia injection quantity for each ammonia injection zone. Subtract the sum of the theoretical ammonia injection quantities of each ammonia injection zone from the sum of the current ammonia injection quantities to obtain the denitrification ammonia demand deviation. Use this deviation as the ammonia production increment. Divide the ammonia production increment by the allowable ammonia production rate of the ammonia production equipment to obtain the ammonia production adjustment duration. Add the time interval to the current sampling time, subtract the urea hydrolysis ammonia production lag time and the ammonia production adjustment duration to obtain the execution time of the ammonia production linkage command.

[0038] S102: Determine the positive ammonia injection correction amount for each ammonia injection zone based on the operating data, and determine the increase injection adjustment margin for each ammonia injection zone based on the current ammonia injection amount and the preset upper limit of the ammonia injection amount.

[0039] The forward ammonia injection correction amount refers to the additional ammonia injection amount required for each ammonia injection zone based on the current ammonia injection amount. The preset upper limit of ammonia injection amount refers to the maximum ammonia injection amount allowed for the corresponding ammonia injection zone in advance. The excess amount of NOx concentration in each ammonia injection zone that exceeds the target NOx concentration is calculated. When the excess amount is positive, the excess amount, the flue gas flow rate of the corresponding ammonia injection zone, and the conversion factor of the denitrification ammonia amount are multiplied sequentially to obtain the required ammonia injection amount for denitrification in the zone. When the required ammonia injection amount for denitrification in the zone is greater than the current ammonia injection amount, the difference between the two is used as the forward ammonia injection correction amount; otherwise, the forward ammonia injection correction amount is set to zero.

[0040] The injection adjustment margin refers to the space that can still be increased between the current ammonia injection quantity and the upper limit of the ammonia injection quantity. The injection adjustment margin of the adjacent ammonia injection zone is obtained by subtracting the upper limit of the ammonia injection quantity of the adjacent ammonia injection zone from its current ammonia injection quantity.

[0041] S103: When the positive ammonia injection correction amount of the ammonia injection zone does not exceed the corresponding increase injection adjustment margin, a zone ammonia injection linkage command is generated to adjust the ammonia injection amount of the ammonia injection zone.

[0042] The zoned ammonia injection linkage command refers to the control command that adjusts the ammonia injection amount of the corresponding ammonia injection zone. The positive ammonia injection correction amount is converted into the valve opening adjustment amount of the corresponding ammonia injection branch to generate the zoned ammonia injection linkage command.

[0043] S104: When there is a target ammonia injection zone where the positive ammonia injection correction amount exceeds the corresponding increase injection adjustment margin, select the adjacent ammonia injection zone, and generate a guide vane angle linkage command based on the zone mismatch information between the target ammonia injection zone and the adjacent ammonia injection zone, the ammonia escape concentration, and the current angle of the guide vane.

[0044] The target ammonia injection zone refers to the ammonia injection zone where the forward ammonia injection correction exceeds the corresponding increase in injection adjustment margin. Adjacent ammonia injection zones are those adjacent to the target ammonia injection zone in the flue gas section. Zone mismatch information refers to the difference in denitrification requirements between the target ammonia injection zone and adjacent ammonia injection zones. The guide vane angle linkage command is the control command used to adjust the deflection state of the guide vane.

[0045] When the escape warning threshold is not reached, select the ammonia injection zones with a greater than zero injection adjustment margin from the adjacent ammonia injection zones of the target ammonia injection zone as candidate adjacent ammonia injection zones, and generate the guide vane angle linkage command according to the methods of S200 to S207.

[0046] A flow deflector is a device installed in the denitrification inlet flue to adjust the flow direction and zoned exchange rate of the flue gas and ammonia mixture after ammonia injection. The flow deflector is located between the ammonia injection port or ammonia injection grid and the catalyst inlet to guide the flue gas and ammonia mixture after the reaction. When a flow deflector angle linkage command is generated, the target flow deflector participating in this adjustment can be determined based on the zone mismatch information between the target ammonia injection zone and the adjacent ammonia injection zones. For flow deflectors corresponding to non-target flue gas flow paths, they are adjusted to a preset blocking angle or minimum flue gas exchange angle to limit the interference of non-target flue gas flow paths on the current flue gas flow distribution adjustment.

[0047] S105: When the ammonia escape concentration reaches the preset ammonia escape warning threshold, the total ammonia injection rate is limited.

[0048] The preset ammonia escape warning threshold refers to the concentration limit set in advance based on the safety requirements of the allowable emission limit for ammonia escape, used to judge the risk of ammonia escape at the denitrification outlet.

[0049] When the ammonia escape concentration reaches the preset ammonia escape warning threshold, it indicates that continuing to increase the total ammonia injection amount may lead to an increase in ammonia escape. At this time, the total ammonia injection amount is limited to within the current total ammonia injection amount, and the generation of ammonia increase control content for increasing the total ammonia injection amount is suspended.

[0050] S106: Adjust the ammonia production parameters according to the ammonia production linkage command, adjust the ammonia injection volume of each ammonia injection zone according to the zone ammonia injection linkage command, and adjust the guide plate angle according to the guide plate angle linkage command.

[0051] Before issuing the command, the ammonia escape concentration is used to determine whether the ammonia escape constraint is triggered. When the ammonia escape concentration reaches the preset ammonia escape warning threshold, the ammonia escape constraint is used as the priority control condition to pause, delay, or limit the ammonia increase adjustment in the ammonia production linkage command, and the ammonia production parameters are adjusted with the corrected ammonia production linkage command.

[0052] Reference Figure 3 The methods for generating guide vane angle linkage commands include: S200: Determine the NOx concentration difference, flue gas flow difference, and additional injection adjustment margin between the target ammonia injection zone and adjacent ammonia injection zones based on the zone mismatch information between the target ammonia injection zone and adjacent ammonia injection zones.

[0053] The NOx concentration difference refers to the difference in NOx concentration between the target ammonia injection zone and the adjacent ammonia injection zone. The flue gas flow rate difference refers to the difference in flue gas flow rate between the target ammonia injection zone and the adjacent ammonia injection zone.

[0054] Based on the zone mismatch information, the NOx concentration of the target ammonia injection zone is subtracted from the NOx concentration of the adjacent ammonia injection zone to obtain the NOx concentration difference; the flue gas flow rate of the target ammonia injection zone is subtracted from the flue gas flow rate of the adjacent ammonia injection zone to obtain the flue gas flow rate difference.

[0055] S201: Determine the amount of ammonia injection exceeding the limit in the target ammonia injection zone based on the difference between the positive ammonia injection correction amount and the corresponding increase injection adjustment margin.

[0056] Ammonia injection exceeding the limit refers to the portion of the forward ammonia injection correction that exceeds its injection adjustment margin. The difference between the forward ammonia injection correction and the corresponding injection adjustment margin is calculated. If the difference is positive, it is determined as the ammonia injection exceeding the limit for the target ammonia injection zone; if the difference is zero or negative, there is no ammonia injection exceeding the limit.

[0057] S202: Identify candidate adjacent ammonia injection zones with increased injection adjustment margin from adjacent ammonia injection zones.

[0058] Candidate adjacent ammonia injection zones refer to adjacent ammonia injection zones with an increased injection adjustment margin. Ammonia injection zones with an increased injection adjustment margin greater than zero are selected as candidate adjacent ammonia injection zones. When there are multiple candidate adjacent ammonia injection zones, the ammonia injection zone with the larger increased injection adjustment margin can be given priority.

[0059] S203: Determine the deflection direction of the guide vane based on the NOx concentration difference and flue gas flow rate difference between the target ammonia injection zone and the candidate adjacent ammonia injection zone.

[0060] The deflection direction refers to the direction in which the flow guide plate rotates relative to a preset reference angle, causing a change in the flue gas flow distribution between adjacent ammonia injection zones. The first direction is the direction in which the flue gas flow of the target ammonia injection zone decreases and the flue gas flow of the candidate adjacent ammonia injection zones increases after the flow guide plate deflects. The second direction is the direction in which the flue gas flow of the target ammonia injection zone increases and the flue gas flow of the candidate adjacent ammonia injection zones decreases after the flow guide plate deflects. The flow guide plate is determined to deflect in the direction of reducing the flue gas flow of the target ammonia injection zone and increasing the flue gas flow of the candidate adjacent ammonia injection zones.

[0061] S204: Determine the initial angle correction amount based on the ratio of the excess ammonia injection amount to the increase injection adjustment margin of the candidate adjacent ammonia injection zone.

[0062] The initial angle correction amount refers to the initial value of the target deflection amplitude of the guide vane determined based on the current ammonia injection over-limit amount and the receiving capacity of the candidate adjacent ammonia injection zone. The ammonia injection over-limit amount of the target ammonia injection zone is compared with the increased injection adjustment margin of the candidate adjacent ammonia injection zone to obtain the receiving ratio value, and the initial angle correction amount is obtained by querying a preset correspondence table. The initial angle correction amount is not accumulated with the current angle of the guide vane.

[0063] S205: Based on the difference in flue gas flow between the target ammonia injection zone and the candidate adjacent ammonia injection zone, the initial angle correction amount is increased or decreased to obtain the angle correction amount to be executed.

[0064] The angle correction amount to be executed refers to the target deflection amplitude of the guide vane determined by combining the flue gas flow difference. The absolute value of the flue gas flow difference is input into a preset correspondence table between flue gas flow difference and target deflection amplitude correction amount to obtain the angle compensation amount. The initial angle correction amount is then corrected based on the angle compensation amount to obtain the angle correction amount to be executed. The angle correction amount to be executed is not added to the current angle of the guide vane. The current angle of the guide vane is only used to determine the actual angle adjustment amount later.

[0065] All other things being equal, the larger the acceptance ratio, the greater the initial angle correction; once the deflection direction is determined, the greater the difference in flue gas flow rate, the greater the angle compensation.

[0066] S206: Determine the target angle based on the deflection direction and the preset angle limit of the guide vane.

[0067] The preset angle limit refers to the maximum angle range that the deflector is allowed to deflect in advance. The angle correction amount refers to the actual allowable adjustment amount of the deflector angle after being constrained by the angle limit.

[0068] Using a preset reference angle as the calculation reference, if the deflection direction is the first direction, the preset reference angle is added to the angle correction to be executed to obtain the target angle; if the deflection direction is the second direction, the preset reference angle is subtracted from the angle correction to be executed to obtain the target angle; when the target angle exceeds the preset angle limit, the target angle is restricted to the angle corresponding to the angle limit.

[0069] S207: Generates a guide vane angle linkage command based on the target angle and the current angle of the guide vane.

[0070] Subtract the current angle of the deflector from the target angle to obtain the actual angle adjustment amount, and generate a deflector angle linkage command based on the actual angle adjustment amount to control the deflector to deflect from the current angle to the target angle.

[0071] After generating the deflector angle linkage command, but before executing the deflector angle linkage command, the process also includes: S300: Predicts the flue gas flow rate changes of the target ammonia injection zone and candidate adjacent ammonia injection zones based on the pre-established guide vane angle correction.

[0072] The change in flue gas flow rate refers to the increase or decrease in flue gas flow rate in each ammonia injection zone relative to the flow rate before adjustment, after the guide vane angle is adjusted. The change is positive when the flue gas flow rate increases and negative when it decreases. A mapping table is pre-established between the guide vane angle correction and the change in flue gas flow rate in each ammonia injection zone. After generating the guide vane angle linkage command, the change in flue gas flow rate is obtained by querying the mapping table based on the angle correction.

[0073] S301: Based on the change in flue gas flow rate of the target ammonia injection zone, recalculate the positive ammonia injection correction amount for the target ammonia injection zone.

[0074] Add the current flue gas flow rate of the target ammonia injection zone to the flue gas flow rate change to obtain the predicted flue gas flow rate of the target ammonia injection zone after the baffle plate is adjusted; then, refer to the method for determining the ammonia injection amount required for denitrification in S102 above to determine the ammonia injection amount required for denitrification of the zone corresponding to the predicted flue gas flow rate, and subtract the newly determined ammonia injection amount required for denitrification of the zone from the current ammonia injection amount to obtain the positive ammonia injection correction amount.

[0075] S302: Based on the change in flue gas flow rate of the candidate adjacent ammonia injection zone, recalculate the positive ammonia injection correction amount of the candidate adjacent ammonia injection zone, and determine whether the recalculated positive ammonia injection correction amount of the candidate adjacent ammonia injection zone exceeds its injection adjustment margin.

[0076] The forward ammonia injection correction amount should be re-determined according to the method in S301.

[0077] S303: If the recalculated forward ammonia injection correction amount still exceeds the injection adjustment margin, the angle correction amount is increased within the preset angle limit of the guide vane, and the guide vane angle linkage command is regenerated based on the increased angle correction amount.

[0078] If the recalculated forward ammonia injection correction amount still exceeds the corresponding injection adjustment margin, then the angle correction amount is increased within the angle limit range according to the method for determining the angle correction amount in S204 to S206, and the guide vane angle linkage command is regenerated according to the method for generating the guide vane angle linkage command in S207.

[0079] S304: If the positive ammonia injection correction amount of the candidate adjacent ammonia injection zone after recalculation exceeds its injection adjustment margin, then a supplementary zone with injection adjustment margin is determined from other adjacent ammonia injection zones, and the supplementary zone is used as a new candidate adjacent ammonia injection zone to regenerate the guide vane angle linkage command.

[0080] The supplementary zone refers to other adjacent ammonia injection zones that still have an injection adjustment margin besides the current candidate adjacent ammonia injection zone. The ammonia injection zones with an injection adjustment margin greater than zero can be selected from the ammonia injection zones adjacent to the candidate adjacent ammonia injection zone as supplementary zones. The supplementary zone is then used as a new candidate adjacent ammonia injection zone, and the guide vane angle linkage command is regenerated according to the methods in S203 to S207.

[0081] S305: If the forward ammonia injection correction amount of the target ammonia injection zone after recalculation falls back to within the corresponding injection adjustment margin, and the forward ammonia injection correction amount of the candidate adjacent ammonia injection zone after recalculation does not exceed its injection adjustment margin, then execute the guide vane angle linkage command.

[0082] When the execution conditions are met, the guide vane angle linkage command is sent to the guide vane actuator to control the guide vane to deflect to the target angle.

[0083] When there is no adjacent ammonia injection zone that can be accepted, or when the target ammonia injection zone still exceeds the limit after the deflector reaches the angle limit, the current deflector compensation is stopped and an alarm is output; when multiple target ammonia injection zones exceed the limit at the same time, the adjustment order is determined from high to low according to the amount of ammonia exceeding the limit, the amount of NOx exceeding the standard, or the risk of ammonia escape; when multiple target ammonia injection zones compete for the same candidate adjacent ammonia injection zone, the increase adjustment margin of the candidate adjacent ammonia injection zone is allocated according to the proportion of ammonia exceeding the limit.

[0084] When the ammonia slip concentration reaches the preset ammonia slip warning threshold and limits the increase in total ammonia injection, and the positive ammonia injection correction amount of the target ammonia injection zone exceeds the corresponding injection adjustment margin, the method for generating the guide vane angle linkage command also includes: S400: Determine the risk path of ammonia blending between the target ammonia injection zone and at least one candidate ammonia injection zone based on operational data.

[0085] If the ammonia escape concentration reaches the ammonia escape warning threshold, it indicates that continuing to increase ammonia may amplify the risk of ammonia escape. If the positive ammonia injection correction amount of the target ammonia injection zone exceeds the corresponding injection adjustment margin, it indicates that the injection capacity of this zone is insufficient. Under the condition of keeping the total ammonia injection amount unchanged and freezing the ammonia injection increment of each ammonia injection zone, identify the risk path of ammonia-rich mixing so as to carry out path isolation or local load reduction control in the future.

[0086] Candidate rich ammonia injection zones refer to ammonia injection zones that still have a surplus of ammonia injection amount relative to the denitrification demand of the zone. The denitrification demand ammonia injection amount of each ammonia injection zone is determined according to the method in S102. The current ammonia injection amount of each ammonia injection zone is subtracted from the corresponding denitrification demand ammonia injection amount of the zone. If the difference is positive, the corresponding ammonia injection zone is determined as a candidate rich ammonia injection zone.

[0087] The ammonia-rich blending risk path refers to the lateral flue gas exchange path between the candidate ammonia-rich injection zone and the target ammonia injection zone, based on the lateral adjacency of the flue gas cross-section, partitions, adjustable exchange channels, and flue gas exchange direction. The relay ammonia injection zone refers to an ammonia injection zone located between the candidate ammonia-rich injection zone and the target ammonia injection zone, participating in the lateral exchange of ammonia-rich flue gas through adjacent adjustable exchange channels.

[0088] S401: Based on the NOx concentration, flue gas flow rate, and injection margin of the intermediate ammonia injection zone in the rich ammonia blending risk path, determine the intermediate ammonia snatching risk and ammonia escape amplification risk in the rich ammonia blending risk path.

[0089] Intermediate ammonia injection zone refers to the ammonia injection zone located between the candidate rich ammonia injection zone and the target ammonia injection zone. Intermediate ammonia rush risk refers to the risk that the intermediate ammonia injection zone consumes rich ammonia flue gas, making it difficult for the rich ammonia flue gas to effectively reach the target ammonia injection zone. Ammonia slip amplification risk refers to the risk that the rich ammonia flue gas may not be effectively consumed, potentially increasing ammonia slip at the denitrification outlet. The specific methods for determining the insufficient compensation risk, intermediate ammonia rush risk, and ammonia slip amplification risk will be disclosed in subsequent sections S500 to S505.

[0090] S402: When there is a risk of ammonia snatching or ammonia escape amplification in the rich ammonia blending risk path, a path isolation type baffle angle linkage command is generated to reduce the amount of flue gas exchange between the candidate rich ammonia injection zone and the target ammonia injection zone.

[0091] When there is a risk of ammonia snatching or ammonia escape amplification in the rich ammonia blending risk path, it is determined that the path is not suitable as a path for the rich ammonia flue gas to compensate for the flow of ammonia injection zone. A path isolation type guide vane angle linkage command is generated to adjust the guide vane corresponding to the path to the minimum exchange angle, so as to reduce the impact of the flue gas flow path corresponding to the path on other paths.

[0092] S403: Based on the predicted flue gas flow rate of the target ammonia injection zone after the execution of the path-isolated guide vane angle linkage command, recalculate the positive ammonia injection correction amount of the target ammonia injection zone.

[0093] Based on the deflection direction and angle correction amount in the path-isolated guide vane angle linkage command, the flue gas flow change of the target ammonia injection zone is determined according to the method of S300, and the predicted flue gas flow of the target ammonia injection zone is obtained accordingly; then, according to the method of S301, the positive ammonia injection correction amount of the target ammonia injection zone is recalculated.

[0094] S404: When the recalculated positive ammonia injection correction amount still exceeds the injection adjustment margin, a localized deflector angle linkage command is generated based on the flue gas flow difference between the target ammonia injection zone and the adjacent ammonia injection zone, as well as the injection adjustment margin of the adjacent ammonia injection zone, to transfer part of the flue gas load of the target ammonia injection zone to the adjacent ammonia injection zone.

[0095] When the target ammonia injection zone is still out of control, the flue gas flow rate of the target ammonia injection zone is subtracted from the flue gas flow rate of each adjacent ammonia injection zone to obtain the flue gas flow rate difference. The adjacent ammonia injection zones with a positive flue gas flow rate difference and an increased injection adjustment margin are identified as receiving zones. The guide vane angle linkage command for diverting the flue gas load to the receiving zone is generated according to the methods in S203 to S207.

[0096] Methods for determining the intermediate ammonia snatching risk and ammonia slip amplification risk in ammonia-rich blending risk pathways include: S500: Based on the current ammonia injection rate, NOx concentration, and flue gas flow rate of the candidate ammonia-rich injection zone, determine the amount of excess ammonia in the candidate ammonia-rich injection zone, and determine whether the excess ammonia is allowed to be released based on the comparison between the ammonia escape concentration and the ammonia escape warning threshold.

[0097] Excess ammonia refers to the portion of the current ammonia injection volume of a candidate ammonia-rich injection zone that exceeds the ammonia injection volume required for denitrification in that zone. Releasable excess ammonia refers to the excess ammonia volume that is allowed to participate in compensation without triggering an amplification of ammonia escape risk.

[0098] The excess ammonia amount is obtained by subtracting the current ammonia injection amount from the required ammonia injection amount for denitrification in the zone; when the ammonia escape concentration reaches or exceeds the ammonia escape warning threshold, the amount of releaseable excess ammonia is determined to be zero, and the flow path corresponding to this excess ammonia amount is taken as the path to be isolated.

[0099] S501: Determine the ammonia consumption of the relay ammonia injection zone based on the deviation of the zone's NOx concentration from the target NOx concentration, the flue gas flow rate of the relay ammonia injection zone, and the conversion factor for the amount of ammonia used for denitrification.

[0100] Intermediate ammonia consumption refers to the amount of ammonia consumed by the intermediate ammonia injection zone when the ammonia-rich flue gas passes through it. The intermediate NOx excess amount is calculated when the NOx concentration of the intermediate ammonia injection zone is higher than the target NOx concentration. When the intermediate NOx excess amount is positive, the intermediate ammonia consumption amount is obtained by multiplying the intermediate NOx excess amount, the flue gas flow rate of the intermediate ammonia injection zone, and the conversion factor of the denitrification ammonia amount in sequence. Otherwise, the intermediate ammonia consumption amount is determined to be zero.

[0101] S502: Determine the relay transmission rate based on the amount of releasable surplus ammonia entering the relay ammonia injection zone, the relay ammonia consumption, and the flue gas exchange flow rate between the relay ammonia injection zone and the adjacent next-level ammonia injection zone.

[0102] The relay transmission volume refers to the amount of excess ammonia that can be released and, after being consumed by the current relay ammonia injection zone, continues to be transmitted to the adjacent next-level ammonia injection zone.

[0103] The relay transmission volume is calculated along the lateral adjacent sequence corresponding to the ammonia-rich blending risk path, and the relay transmission volume of the previous relay ammonia injection zone is used as the entry volume of the next adjacent relay ammonia injection zone; if the relay transmission volume that finally reaches the target ammonia injection zone is less than the ammonia injection limit of the target ammonia injection zone, it is determined that there is a risk of insufficient compensation for the path.

[0104] S503: When the relay transmission volume calculated step by step along the ammonia-rich blending risk path is less than the ammonia injection limit of the target ammonia injection zone, it is determined that there is a risk of insufficient compensation in the ammonia-rich blending risk path.

[0105] The risk of insufficient compensation refers to the risk that the amount of surplus ammonia ultimately delivered to the target ammonia injection zone is less than the amount of ammonia exceeding the injection limit.

[0106] The relay transmission volume is calculated step by step along the ammonia-rich blending risk path according to the method of S502, and the relay transmission volume of the previous stage is used as the input volume of the next stage; if the final relay transmission volume is less than the ammonia injection limit of the target ammonia injection zone, it is determined that there is a risk of insufficient compensation in this path.

[0107] S504: When the injection adjustment margin of any relay ammonia injection zone is less than the corresponding relay ammonia consumption, or when the positive ammonia injection correction amount of any relay ammonia injection zone after considering the relay ammonia consumption exceeds the corresponding injection adjustment margin, it is determined that there is a risk of relay ammonia grabbing in the rich ammonia mixing risk path.

[0108] If the ammonia consumption of the relay is greater than the corresponding increase injection adjustment margin, or if the positive ammonia injection correction amount obtained by adding the ammonia injection amount required for denitrification of the relay ammonia injection zone to the ammonia consumption of the relay ammonia injection zone and recalculating according to S102 exceeds the corresponding increase injection adjustment margin, then it is determined that there is a risk of relay ammonia snatching in this path.

[0109] S505: When the amount of releasable surplus ammonia in the candidate ammonia-rich injection zone is greater than the ammonia injection limit in the target ammonia injection zone, and the difference between the ammonia escape concentration at the denitrification outlet and the ammonia escape warning threshold is less than the preset safety margin, it is determined that there is a risk of ammonia escape amplification in the ammonia-rich mixing risk path.

[0110] The preset safety margin refers to the minimum concentration difference that must be maintained between the ammonia slip concentration and the ammonia slip warning threshold. The ammonia slip margin is obtained by subtracting the ammonia slip concentration at the denitrification outlet from the ammonia slip warning threshold. When the ammonia slip concentration at the denitrification outlet reaches or exceeds the ammonia slip warning threshold, or when the amount of excess ammonia that can be released is greater than the ammonia injection limit of the target ammonia injection zone and the ammonia slip margin is less than the safety margin, it is determined that there is a risk of ammonia slip amplification in the rich ammonia mixing risk path.

[0111] Methods for generating path-isolated guide vane angle linkage commands include: S600: Based on the adjacency relationship between candidate rich ammonia injection zones, relay ammonia injection zones and target ammonia injection zones in the rich ammonia blending risk path, determine the target guide plate affected by the rich ammonia blending risk path.

[0112] The target guide plate refers to the guide plate used to adjust the amount of flue gas exchange between adjacent ammonia injection zones on the ammonia-rich blending risk path. The flue gas exchange position between each adjacent ammonia injection zone is determined along the ammonia-rich blending risk path, and the guide plate corresponding to the flue gas exchange position is determined as the target guide plate.

[0113] S601: Based on the current angle of the target guide vane, the angle limit of the target guide vane, and the preset single adjustment step size, determine the angle correction direction and angle correction amount for reducing the amount of flue gas exchange on the path to reduce the risk of ammonia-rich mixing.

[0114] The preset single adjustment step size is the maximum angle that the guide vane can be adjusted in a single operation. The direction of angle correction for the target guide vane is determined as the direction of reducing the amount of flue gas exchanged in the path that reduces the risk of ammonia-rich mixing; the single adjustment step size is used as the angle correction amount to be executed, and the angle correction amount is obtained according to the current angle and angle limit of the target guide vane in accordance with the amplitude limiting processing method in S206.

[0115] S602: Generate path-isolated guide vane angle linkage commands based on the angle correction direction and angle correction amount.

[0116] The target angle of the target deflector is determined according to the method in S207 to generate a path-isolated deflector angle linkage command.

[0117] S603: Based on the pre-established mapping relationship between the guide vane angle and the change in flue gas flow rate of each ammonia injection zone, predict the flue gas flow rate of the target ammonia injection zone after the execution of the path-isolated guide vane angle linkage command.

[0118] The angle change is determined by subtracting the target angle from the current angle of the target guide vane in the path isolation type guide vane angle linkage command; then, the flue gas flow change of the target ammonia injection zone is determined according to the method for determining the flue gas flow change in S300, and the predicted flue gas flow of the target ammonia injection zone is obtained based on the flue gas flow change.

[0119] S604: Based on the predicted flue gas flow rate of the target ammonia injection zone, recalculate the positive ammonia injection correction amount for the target ammonia injection zone.

[0120] Based on the predicted flue gas flow rate of the target ammonia injection zone, the positive ammonia injection correction amount of the target ammonia injection zone is recalculated according to the method in S301.

[0121] S605: When the recalculated positive ammonia injection correction amount still exceeds the injection adjustment margin, a guide vane angle linkage command is generated based on the flue gas flow difference between the target ammonia injection zone and the adjacent ammonia injection zone, the injection adjustment margin of the adjacent ammonia injection zone, and the current angle of the guide vane. This command is used to reduce the flue gas flow of the target ammonia injection zone or to transfer part of the flue gas load of the target ammonia injection zone to the adjacent ammonia injection zone with the injection adjustment margin. This command is a localized load reduction type.

[0122] If the limit is still exceeded, select the adjacent ammonia injection zone according to the method for determining the receiving zone in S404; then generate the guide vane angle linkage command according to the methods in S203 to S207.

[0123] After generating the baffle angle linkage command and before adjusting the ammonia production parameters according to the ammonia production linkage command, the following steps are also included: S700: After generating the guide vane angle linkage command, before adjusting the ammonia production parameters according to the ammonia production linkage command, the ammonia production response arrival time corresponding to the ammonia production linkage command is determined according to the preset urea hydrolysis ammonia production lag time.

[0124] The ammonia production response arrival time refers to the moment when the change in ammonia production caused by the ammonia production linkage command begins to affect the denitrification system.

[0125] Starting from the current moment, the ammonia production response arrival time is obtained by superimposing the lag time of urea hydrolysis.

[0126] S701: Based on the reduction amount of NOx load in the target ammonia injection zone between the current time and the ammonia production response time, according to the baffle angle linkage command, determine the equivalent ammonia reduction amount within the lag compensation window.

[0127] The lag compensation window refers to the time period between the current moment and the moment the ammonia production response is reached. The equivalent ammonia reduction is the amount of denitrification ammonia demand reduced by the flow plate adjustment within the lag compensation window.

[0128] The reduction in flue gas flow rate of the target ammonia injection zone is determined according to the S300 method. The reduction in flue gas flow rate is multiplied by the NOx concentration of the target ammonia injection zone to obtain the NOx load reduction. The NOx load reduction is then multiplied by the preset denitrification ammonia amount conversion factor to obtain the equivalent ammonia reduction.

[0129] S702: Determine the uncovered ammonia demand based on the deviation in denitrification ammonia demand and the equivalent ammonia reduction within the lag compensation window.

[0130] Uncovered ammonia demand refers to the amount of denitrification ammonia demand that is not offset by the equivalent ammonia reduction within the lag compensation window. The uncovered ammonia demand is obtained by subtracting the equivalent ammonia reduction from the denitrification ammonia demand deviation within the lag compensation window.

[0131] S703: When the amount of uncovered ammonia demand is less than or equal to the preset uncovered threshold, stop the ammonia increase adjustment in the ammonia production linkage command.

[0132] The preset uncovered threshold refers to the remaining ammonia demand judgment value that allows the ammonia increase regulation to be stopped. When the uncovered ammonia demand is less than or equal to the preset uncovered threshold, it indicates that the remaining ammonia increase demand within the ammonia production lag compensation window is small. Continuing to execute the ammonia increase regulation may bring the risk of ammonia escape. Therefore, the ammonia increase regulation content in the ammonia production linkage instruction is stopped.

[0133] S704: When the uncovered ammonia demand exceeds the preset uncovered threshold, the ammonia production increment in the ammonia production linkage command is adjusted according to the uncovered ammonia demand.

[0134] When the amount of ammonia not covered exceeds the preset threshold for not covered, it indicates that the adjustment of the guide plate is still insufficient to cover the ammonia increase demand within the ammonia production lag window. At this time, the ammonia production increment in the ammonia production linkage instruction is updated with the amount of ammonia not covered, according to the method of generating the ammonia production linkage instruction in S101.

[0135] S705: When the ammonia escape concentration reaches the preset ammonia escape warning threshold, postpone the execution time of the ammonia increase adjustment content in the ammonia production linkage command, or reduce the ammonia production increment or ammonia change rate in the ammonia production linkage command.

[0136] When the ammonia escape concentration reaches the ammonia escape warning threshold, the execution time of the ammonia increase adjustment is delayed, or the ammonia production increment or ammonia change rate is reduced.

[0137] Methods for determining the forward ammonia injection correction amount for each ammonia injection zone include: S800: Based on the NOx concentration and flue gas flow distribution data of each ammonia injection zone, determine the required ammonia injection amount for denitrification in each zone.

[0138] Following the method for determining the required ammonia injection amount for zoned denitrification in S102, the required ammonia injection amount for each zoned denitrification is determined based on the zoned NOx concentration and flue gas flow distribution data.

[0139] S801: Determine the initial ammonia injection correction amount for each ammonia injection zone based on the difference between the required ammonia injection amount for denitrification in each zone and the current ammonia injection amount.

[0140] The initial ammonia injection correction amount refers to the initial difference between the required ammonia injection amount for denitrification in each zone and the current ammonia injection amount. The corresponding initial ammonia injection correction amount is obtained by subtracting the current ammonia injection amount from the required ammonia injection amount for denitrification in each ammonia injection zone.

[0141] S802: Based on the initial ammonia injection correction amount, the NOx concentration of each ammonia injection zone, the target NOx concentration, and the slope of NOx concentration change, determine the candidate ammonia-deficient zones from each ammonia injection zone.

[0142] The slope of NOx concentration change refers to the amount of change in NOx concentration in a zone over the sampling time.

[0143] If the initial ammonia injection correction value of the ammonia injection zone is positive, the NOx concentration of the zone is higher than the target NOx concentration, and the slope of the NOx concentration change is positive, then the ammonia injection zone is determined as a candidate ammonia-deficient zone.

[0144] S803: When the proportion of the number of candidate ammonia-deficient zones to the total number of ammonia injection zones reaches the preset ammonia deficiency ratio threshold, it is determined that there is a total ammonia deficiency state.

[0145] The preset ammonia deficiency ratio threshold refers to the pre-set limit on the proportion of candidate ammonia-deficient zones used to determine whether a total ammonia deficiency state has formed. A total ammonia deficiency state refers to a state in which multiple ammonia injection zones share ammonia deficiency demand. The number of candidate ammonia-deficient zones is compared with the total number of ammonia injection zones; if this ratio reaches the preset ammonia deficiency ratio threshold, a total ammonia deficiency state is determined to exist.

[0146] S804: When there is a total ammonia deficiency, the initial ammonia injection correction amount of each candidate ammonia deficiency zone is proportionally corrected according to the deviation of ammonia demand for denitrification, so as to obtain the positive ammonia injection correction amount of each candidate ammonia deficiency zone.

[0147] When there is a total ammonia deficiency, it indicates that the overall ammonia supply of the denitrification system is insufficient. When the sum of the initial ammonia injection correction amounts of each candidate ammonia deficiency zone is greater than zero, the ammonia demand deviation for denitrification is allocated according to the proportion of the initial ammonia injection correction amounts of each candidate ammonia deficiency zone to obtain the positive ammonia injection correction amount of each candidate ammonia deficiency zone. When the sum is zero, the initial ammonia injection correction amounts of each candidate ammonia deficiency zone remain unchanged.

[0148] S805: When the initial ammonia injection correction amount of the target ammonia injection zone is positive, and the initial ammonia injection correction amount of at least one adjacent ammonia injection zone is negative or less than the preset correction threshold, it is determined that there is a distributed mismatch state.

[0149] The preset correction threshold refers to the limit value for ammonia injection correction used to determine whether there is no significant increase in ammonia injection demand in adjacent ammonia injection zones. Distributed mismatch refers to a situation where the target ammonia injection zone has an increase in injection demand, while adjacent ammonia injection zones have no significant increase in injection demand or have surplus ammonia injection.

[0150] S806: When a distributed mismatch exists, the initial ammonia injection correction amount of the target ammonia injection zone is determined as the positive ammonia injection correction amount of the target ammonia injection zone, and the total ammonia injection increment control generated based on the denitrification ammonia demand deviation is suspended or delayed. The guide vane angle linkage command is generated first based on the zone mismatch information between the target ammonia injection zone and the adjacent ammonia injection zone.

[0151] When a distributed mismatch exists, it indicates that the target ammonia injection zone has an increased injection demand, while the adjacent ammonia injection zone still has the capacity to receive the injection. The initial ammonia injection correction amount of the target ammonia injection zone is used as its positive ammonia injection correction amount. At the same time, the total ammonia injection increment control generated according to S101 is suspended or delayed, and the guide vane angle linkage command is generated according to the methods of S200 to S207.

[0152] When both total ammonia deficiency and distribution mismatch conditions are met simultaneously, the following additional conditions are also included: S900: When the conditions for determining the existence of both total ammonia deficiency and distribution mismatch are met simultaneously, the proportion of candidate ammonia deficiency zones, the sum of the initial ammonia injection correction for each candidate ammonia deficiency zone, and the deviation of denitrification ammonia demand are normalized respectively, and the total ammonia deficiency index is determined based on the preset total ammonia deficiency weight.

[0153] The total ammonia deficiency index is an evaluation value used to characterize the priority of total ammonia deficiency states. Each parameter can be compared with its corresponding preset upper limit value to obtain normalized parameters. These normalized parameters are then weighted and summed according to their corresponding total ammonia deficiency weights to obtain the total ammonia deficiency index. The preset total ammonia deficiency weights refer to the weighting coefficients corresponding to the above normalized indicators, and the sum of all total ammonia deficiency weights is 1.

[0154] S901: Normalize the initial ammonia injection correction difference, the NOx concentration difference, and the flue gas flow difference between the target ammonia injection zone and the adjacent ammonia injection zone, and determine the distribution mismatch index based on the preset distribution mismatch weight.

[0155] The distribution mismatch index is an evaluation value used to characterize the priority of distributed mismatch states. In this embodiment, the differences in initial ammonia injection correction amounts, NOx concentrations, and flue gas flow rates between the target ammonia injection zone and its adjacent zones are normalized, and then weighted and summed according to their corresponding distribution mismatch weights to obtain the distribution mismatch index.

[0156] S902: When the distribution mismatch index is greater than the total ammonia deficiency index, the distribution mismatch control is prioritized, and the total ammonia injection increment control generated based on the denitrification ammonia demand deviation is suspended or postponed. The guide vane angle linkage command is generated based on the partition mismatch information between the target ammonia injection partition and the adjacent ammonia injection partition.

[0157] When the distribution mismatch index is greater than the total ammonia deficiency index, the distribution mismatch control of S806 shall be implemented first, that is, the guide vane angle shall be adjusted first, and the total ammonia injection increment control shall be suspended or delayed.

[0158] S903: When the total ammonia deficiency index is greater than or equal to the distribution mismatch index, the total ammonia deficiency control shall be prioritized, and an ammonia production linkage instruction shall be generated or maintained based on the deviation of the denitrification ammonia demand.

[0159] When the total ammonia deficiency index is greater than or equal to the distribution mismatch index, total ammonia deficiency control shall be implemented first, and ammonia production linkage instructions shall be generated or maintained in accordance with the method of S101.

[0160] Based on the same inventive concept, embodiments of the present invention provide an integrated system for precise denitrification of coal-fired power generation peak-shaving units, comprising: The memory stores a program for a control method for precise denitrification integration of a coal-fired power peak-shaving unit as described in any one of the above-mentioned methods; The processor loads and executes programs stored in memory.

[0161] By adopting the above technical solution, a precise denitrification integrated method for coal-fired power peak-shaving units is executed by the processor in the memory, thereby reducing the amount of ammonia injected, which can easily lead to an increase in ammonia consumption.

[0162] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0163] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A precise denitrification integrated method for coal-fired power peak-shaving units, characterized in that, include: Acquire operating data during boiler load changes; The deviation in ammonia demand for denitrification within a preset time period is determined based on the operational data, and an ammonia production linkage instruction is generated based on the deviation in ammonia demand for denitrification and the preset lag time for ammonia production from urea hydrolysis. The positive ammonia injection correction amount for each ammonia injection zone is determined based on the operating data, and the additional injection adjustment margin for each ammonia injection zone is determined based on the current ammonia injection amount and the preset upper limit of the ammonia injection amount. When the positive ammonia injection correction amount of the ammonia injection zone does not exceed the corresponding increase injection adjustment margin, a zone ammonia injection linkage command is generated to adjust the ammonia injection amount of the ammonia injection zone. When there is a target ammonia injection zone where the positive ammonia injection correction exceeds the corresponding injection adjustment margin, a guide vane angle linkage command is generated based on the zone mismatch information between the target ammonia injection zone and the adjacent ammonia injection zone, the ammonia escape concentration, and the current angle of the guide vane. When the ammonia escape concentration reaches the preset ammonia escape warning threshold, the total ammonia injection rate is limited. Adjust the ammonia production parameters according to the ammonia production linkage command, adjust the ammonia injection volume of each ammonia injection zone according to the zone ammonia injection linkage command, and adjust the guide plate angle according to the guide plate angle linkage command.

2. The integrated method for precise denitrification of a coal-fired power plant peak-shaving unit according to claim 1, characterized in that, Methods for generating guide vane angle linkage commands include: Determine the partition mismatch information between the target ammonia injection zone and adjacent ammonia injection zones; The amount of ammonia injection exceeding the limit in the target ammonia injection zone is determined based on the difference between the positive ammonia injection correction amount and the corresponding increase injection adjustment margin. From the ammonia injection zones adjacent to the target ammonia injection zone, determine the candidate adjacent ammonia injection zones with increased injection adjustment margin; The deflection direction of the guide vane is determined based on the NOx concentration difference and flue gas flow rate difference between the target ammonia injection zone and the candidate adjacent ammonia injection zones. The initial angle correction amount is determined based on the ratio of the excess ammonia injection amount to the increase injection adjustment margin of the candidate adjacent ammonia injection zones. Based on the difference in flue gas flow between the target ammonia injection zone and the candidate adjacent ammonia injection zone, the initial angle correction amount is adjusted by increasing or decreasing to obtain the angle correction amount to be executed. The target angle is determined based on the deflection direction and the preset angle limit of the guide vane; Generate a guide vane angle linkage command based on the target angle and the current angle of the guide vane.

3. The integrated method for precise denitrification of a coal-fired power plant peak-shaving unit according to claim 2, characterized in that, After generating the deflector angle linkage command, but before executing the deflector angle linkage command, the process also includes: The flue gas flow rate change of the target ammonia injection zone and the candidate adjacent ammonia injection zone is predicted based on the pre-established guide vane angle correction amount. Based on the change in flue gas flow rate of the target ammonia injection zone, recalculate the positive ammonia injection correction amount for the target ammonia injection zone; Based on the change in flue gas flow rate of the candidate adjacent ammonia injection zone, the positive ammonia injection correction amount of the candidate adjacent ammonia injection zone is recalculated, and it is determined whether the positive ammonia injection correction amount of the recalculated candidate adjacent ammonia injection zone exceeds its injection adjustment margin. If the recalculated forward ammonia injection correction amount still exceeds the injection adjustment margin, the angle correction amount is increased within the preset angle limit of the guide vane, and the guide vane angle linkage command is regenerated based on the increased angle correction amount. If the positive ammonia injection correction amount of the candidate adjacent ammonia injection zone after recalculation exceeds its injection adjustment margin, then a supplementary zone with injection adjustment margin is determined from other adjacent ammonia injection zones, and the supplementary zone is used as a new candidate adjacent ammonia injection zone to regenerate the guide vane angle linkage command. If the forward ammonia injection correction amount of the recalculated target ammonia injection zone falls back to within the corresponding injection adjustment margin, and the forward ammonia injection correction amount of the recalculated candidate adjacent ammonia injection zone does not exceed its injection adjustment margin, then the guide vane angle linkage command is executed.

4. The integrated method for precise denitrification of a coal-fired power plant peak-shaving unit according to claim 1, characterized in that, When the ammonia slip concentration reaches the preset ammonia slip warning threshold and limits the increase in total ammonia injection, and the positive ammonia injection correction amount of the target ammonia injection zone exceeds the corresponding injection adjustment margin, the method for generating the guide vane angle linkage command also includes: Based on operational data, determine the risk path of ammonia blending between the target ammonia injection zone and at least one candidate ammonia-rich injection zone; Based on the NOx concentration, flue gas flow rate, and injection margin of the intermediate ammonia injection zone in the rich ammonia blending risk path, the intermediate ammonia snatching risk and ammonia escape amplification risk in the rich ammonia blending risk path are determined. When there is a risk of ammonia snatching or ammonia escape amplification in the rich ammonia blending risk path, an isolation type guide vane angle linkage command is generated to reduce the amount of flue gas exchange between the candidate rich ammonia injection zone and the target ammonia injection zone. Based on the predicted flue gas flow rate of the target ammonia injection zone after the execution of the path-isolated guide vane angle linkage command, the positive ammonia injection correction amount of the target ammonia injection zone is recalculated. When the recalculated positive ammonia injection correction amount still exceeds the injection adjustment margin, a localized deflector angle linkage command is generated based on the flue gas flow difference between the target ammonia injection zone and the adjacent ammonia injection zone, as well as the injection adjustment margin of the adjacent ammonia injection zone. This command is used to transfer part of the flue gas load of the target ammonia injection zone to the adjacent ammonia injection zone.

5. The integrated method for precise denitrification of a coal-fired power plant peak-shaving unit according to claim 4, characterized in that, Methods for determining the intermediate ammonia snatching risk and ammonia slip amplification risk in ammonia-rich blending risk pathways include: Based on the current ammonia injection rate, NOx concentration, and flue gas flow rate of the candidate ammonia-rich injection zone, the excess ammonia amount of the candidate ammonia-rich injection zone is determined, and whether the excess ammonia amount is allowed to be released is determined based on the comparison between the ammonia escape concentration and the ammonia escape warning threshold. The amount of ammonia consumed in the relay ammonia injection zone is determined based on the deviation of the NOx concentration in the relay ammonia injection zone from the target NOx concentration, the flue gas flow rate in the relay ammonia injection zone, and the conversion factor of the denitrification ammonia amount. The relay transmission rate is determined based on the amount of releasable surplus ammonia entering the relay ammonia injection zone, the relay ammonia consumption, and the flue gas exchange flow rate between the relay ammonia injection zone and the adjacent next-level ammonia injection zone. When the relay transmission volume calculated step by step along the ammonia-rich blending risk path is less than the ammonia injection limit of the target ammonia injection zone, it is determined that there is a risk of insufficient compensation in the ammonia-rich blending risk path. When the injection adjustment margin of any relay ammonia injection zone is less than the corresponding relay ammonia consumption, or when the positive ammonia injection correction amount of any relay ammonia injection zone after considering the relay ammonia consumption exceeds the corresponding injection adjustment margin, it is determined that there is a risk of relay ammonia snatching in the rich ammonia mixing risk path. When the amount of releasable surplus ammonia in the candidate ammonia-rich injection zone is greater than the ammonia injection limit in the target ammonia injection zone, and the difference between the ammonia escape concentration at the denitrification outlet and the ammonia escape warning threshold is less than the preset safety margin, it is determined that there is a risk of ammonia escape amplification in the ammonia-rich mixing risk path.

6. The integrated method for precise denitrification of a coal-fired power plant peak-shaving unit according to claim 5, characterized in that, Methods for generating path-isolated guide vane angle linkage commands include: Based on the adjacency relationship between candidate rich ammonia injection zones, relay ammonia injection zones and target ammonia injection zones in the rich ammonia blending risk path, the target guide plate affected by the rich ammonia blending risk path is determined. Based on the current angle of the target guide vane, the angle limit of the target guide vane, and the preset single adjustment step size, determine the angle correction direction and angle correction amount for reducing the amount of flue gas exchange on the path to reduce the risk of ammonia blending. Based on the angle correction direction and angle correction amount, generate path-isolated guide vane angle linkage commands; Based on the pre-established mapping relationship between the guide vane angle and the change in flue gas flow rate of each ammonia injection zone, the predicted flue gas flow rate of the target ammonia injection zone after the execution of the path-isolated guide vane angle linkage command is predicted. Based on the predicted flue gas flow rate of the target ammonia injection zone, recalculate the positive ammonia injection correction amount for the target ammonia injection zone; When the recalculated positive ammonia injection correction still exceeds the injection adjustment margin, a guide vane angle linkage command is generated based on the flue gas flow difference between the target ammonia injection zone and the adjacent ammonia injection zone, the injection adjustment margin of the adjacent ammonia injection zone, and the current angle of the guide vane. This command is used to reduce the flue gas flow of the target ammonia injection zone or to transfer part of the flue gas load of the target ammonia injection zone to the adjacent ammonia injection zone with the injection adjustment margin. This command is a localized load reduction type guide vane angle linkage command.

7. The integrated method for precise denitrification of a coal-fired power plant peak-shaving unit according to claim 1, characterized in that, After generating the baffle angle linkage command and before adjusting the ammonia production parameters according to the ammonia production linkage command, the following steps are also included: Based on the preset urea hydrolysis ammonia production lag time, determine the ammonia production response arrival time corresponding to the ammonia production linkage command; Based on the reduction amount of NOx load in the target ammonia injection zone between the current time and the ammonia production response time, according to the baffle angle linkage command, the equivalent ammonia reduction amount within the lag compensation window is determined. The amount of ammonia demand not covered is determined based on the deviation in ammonia demand for denitrification and the equivalent ammonia reduction within the delayed compensation window. When the amount of uncovered ammonia demand is less than or equal to the preset uncovered threshold, the ammonia increase adjustment in the ammonia production linkage command is stopped. When the uncovered ammonia demand exceeds the preset uncovered threshold, the ammonia production increment in the ammonia production linkage command is adjusted according to the uncovered ammonia demand. When the ammonia escape concentration reaches the preset ammonia escape warning threshold, the execution time of the ammonia increase adjustment content in the ammonia production linkage command is delayed, or the ammonia production increment or ammonia change rate in the ammonia production linkage command is reduced.

8. The integrated method for precise denitrification of a coal-fired power plant peak-shaving unit according to claim 1, characterized in that, Methods for determining the forward ammonia injection correction amount for each ammonia injection zone include: Based on the NOx concentration and flue gas flow distribution data of each ammonia injection zone, determine the required ammonia injection amount for denitrification in each zone. The initial ammonia injection correction amount for each ammonia injection zone is determined based on the difference between the required ammonia injection amount for denitrification in each zone and the current ammonia injection amount. Candidate ammonia-deficient zones are determined from each ammonia injection zone based on the initial ammonia injection correction amount, zone NOx concentration, target NOx concentration, and NOx concentration change slope. When the proportion of the number of candidate ammonia-deficient zones to the total number of ammonia injection zones reaches the preset ammonia deficiency ratio threshold, a total ammonia deficiency state is determined to exist. When there is a total ammonia deficiency, the initial ammonia injection correction amount of each candidate ammonia deficiency zone is proportionally corrected according to the deviation of ammonia demand for denitrification, so as to obtain the positive ammonia injection correction amount of each candidate ammonia deficiency zone. When the initial ammonia injection correction amount of the target ammonia injection zone is positive, and the initial ammonia injection correction amount of at least one adjacent ammonia injection zone is negative or less than the preset correction threshold, it is determined that there is a distributed mismatch state. When a distributed mismatch exists, the initial ammonia injection correction amount of the target ammonia injection zone is determined as the positive ammonia injection correction amount of the target ammonia injection zone, and the total ammonia injection increment control generated based on the denitrification ammonia demand deviation is suspended or delayed. The guide vane angle linkage command is generated first based on the zone mismatch information between the target ammonia injection zone and the adjacent ammonia injection zones.

9. The integrated method for precise denitrification of a coal-fired power plant peak-shaving unit according to claim 8, characterized in that, When both total ammonia deficiency and distribution mismatch conditions are met simultaneously, the following additional conditions are also included: The proportion of candidate ammonia-deficient zones, the sum of the initial ammonia injection correction for each candidate ammonia-deficient zone, and the deviation of ammonia demand for denitrification are normalized respectively, and the total ammonia deficiency index is determined based on the preset total ammonia deficiency weight. The differences in initial ammonia injection correction amount, NOx concentration, and flue gas flow rate between the target ammonia injection zone and adjacent ammonia injection zones are normalized respectively, and the distribution mismatch index is determined based on the preset distribution mismatch weight. When the distribution mismatch index is greater than the total ammonia deficiency index, the distribution mismatch control is prioritized, and the total ammonia injection increment control generated based on the denitrification ammonia demand deviation is suspended or postponed. The guide vane angle linkage command is generated based on the partition mismatch information between the target ammonia injection partition and the adjacent ammonia injection partition. When the total ammonia deficiency index is greater than or equal to the distribution mismatch index, the total ammonia deficiency control is prioritized, and ammonia production linkage instructions are generated or maintained based on the deviation of ammonia demand for denitrification.

10. A precision denitrification integrated system for coal-fired power peak-shaving units, characterized in that, include: The memory stores a program for implementing a control method for precise denitrification integration of a coal-fired power peak-shaving unit as described in any one of claims 1 to 9; The processor loads and executes programs stored in memory.

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