CN115930255A - Method for controlling opening degree of air door baffle under deep peak shaving - Google Patents

Method for controlling opening degree of air door baffle under deep peak shaving Download PDF

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Publication number
CN115930255A
CN115930255A CN202211530352.9A CN202211530352A CN115930255A CN 115930255 A CN115930255 A CN 115930255A CN 202211530352 A CN202211530352 A CN 202211530352A CN 115930255 A CN115930255 A CN 115930255A
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China
Prior art keywords
opening
air door
air
baffle
door baffle
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CN202211530352.9A
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Chinese (zh)
Inventor
王小华
施发承
赵鹏
侯永超
俞胜捷
吴祖达
梅振锋
李任飞
陈宝康
陈敏
姚胜
薛晓垒
彭小敏
王祝成
刘瑞鹏
朱晋永
丁奕文
梁昊
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Xian Thermal Power Research Institute Co Ltd
Suzhou Xire Energy Saving Environmental Protection Technology Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Suzhou Xire Energy Saving Environmental Protection Technology Co Ltd
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Priority to CN202211530352.9A priority Critical patent/CN115930255A/en
Publication of CN115930255A publication Critical patent/CN115930255A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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Abstract

The invention provides a method for controlling the opening of a damper under deep peak shaving, which comprises the following steps: s1, selecting data parameters; s2, analyzing the depth peak regulation data; s3, modifying a logical control value of the opening degree of the air door baffle; s4, verifying an opening control curve of the air door baffle; the operation is simple, and NO is reasonably controlled by the opening degree of the air door baffle plate on the premise of ensuring stable combustion of the unit x The emission concentration is controlled at a low level.

Description

Method for controlling opening degree of air door baffle under deep peak shaving
Technical Field
The invention relates to the technical field of deep peak shaving, in particular to a method for controlling the opening degree of a damper under deep peak shaving.
Background
With large units participating in peak shaving more and more frequently and with lower and lower load probing, the boiler faces several major challenges as follows: firstly, the problem of low-load stable combustion of a boiler is solved; secondly, the problem of dry-wet state conversion exists on the steam-water side of the boiler; thirdly, the smoke temperature of the denitration system cannot meet the minimum temperature required by the catalyst reaction; fourth NO at low load x The emission concentration is higher, the ammonia spraying amount of a denitration system is larger, and the ammonia escape is large. In response to the above problems, researchers have conducted extensive studies in which low loads are appliedStable combustion and NO x The contradiction problem is particularly outstanding when the emission concentration is high, and from the safe operation of a unit, a power plant selects more low-load stable combustion, which causes NO during low-load operation x The emission concentration is high, the ammonia spraying amount is large, the ammonia escape is easy to be too large, and the ammonium bisulfate blocks the air preheater.
Stable combustion and NO of unit during operation under deep peak regulation x The problem that the emission concentration is high and cannot be considered is more obvious, and how to balance the low-load stable combustion and NO x Therefore, the method for controlling the opening degree of the air door baffle under deep peak shaving needs to be provided.
Disclosure of Invention
In order to solve the technical problem, the method for controlling the opening degree of the air door baffle under deep peak shaving is simple to operate, and NO is reasonably controlled through the opening degree of the air door baffle on the premise of ensuring stable combustion of a unit x The emission concentration is controlled at a low level.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides a method for controlling the opening of a damper under deep peak shaving, which comprises the following steps:
s1, selecting data parameters, collecting and calling unit load parameters, economizer outlet oxygen quantity parameters and NO x The discharge concentration parameter, the opening degree parameter of the air door baffle and the flame signal parameter are used as deep peak regulation data;
s2, analyzing the deep peak regulation data, selecting parameters of the unit under rated load operation for key analysis, and analyzing the opening parameter of the air door baffle, the outlet oxygen quantity parameter of the economizer and NO x Analyzing the corresponding relation between the emission concentration parameter and the flame signal parameter to obtain analysis data;
s3, modifying the logical control value of the opening degree of the damper, and determining the NO of the key damper opening degree according to the analysis data x The influence degree of the emission concentration is reduced by repeating the step S2 for multiple times to modify the logical control value of the opening degree of the damper to reduce NO under deep peak regulation x The purpose of the emission concentration;
s4, verifying the opening control curve of the air door baffle, considering stable combustion of the unit under deep peak shaving, calculating the logical control value of the opening of the air door baffle through linear interpolation under the rated load operation condition of the unit, verifying the adaptability and solidifying of the opening control curve of the air door baffle according to the opening value of the air door baffle, and controlling the opening of the air door baffle under the deep peak shaving.
The method for controlling the opening degree of the air door baffle under deep peak shaving is simple to operate, and NO is reasonably controlled through the opening degree of the air door baffle on the premise of ensuring the stable combustion of a unit x The emission concentration is controlled at a low level.
As a preferred technical scheme, the step S2 of analyzing the depth peak-shaving data specifically includes the following steps: NO under rated load operation condition of the unit x The discharge concentration and the oxygen amount at the outlet of the economizer are in a positive correlation, and the oxygen amount at the outlet of the economizer and the opening of the high-level over-fire air baffle are in an inverse correlation.
As a preferred technical scheme, in step S3, according to the analysis data, the opening of the sub-upper high-level burn-up air flap and the opening of the uppermost high-level burn-up air flap are determined as the opening of the key damper flap so as to control NO under deep peak shaving x The concentration of the emission.
As a preferred technical scheme, the verification of the opening degree control curve of the damper door in the step S4 specifically comprises the following steps: the method comprises the steps that under the condition that a unit operates at a rated load, under the condition of deep peak regulation, flame signals are stable, a preset operating oxygen amount value and an actual operating oxygen amount value of the unit in the rated load interval are collected, the difference value between the actual operating oxygen amount value and the preset operating oxygen amount value is calculated, a corresponding oxygen amount range is obtained through the difference value calculation, a logical control value of the opening degree of an air door baffle is obtained through the corresponding oxygen amount range according to linear interpolation calculation, an opening degree value of the air door baffle is obtained through the linear interpolation calculation according to the logical control value of the opening degree of the air door baffle, the adaptability and solidification of an opening degree control curve of the air door baffle are verified according to the opening degree value of the air door baffle, and the opening degree of the air door baffle under the deep peak regulation is controlled, so that the actual operating oxygen amount value is gradually reduced to the preset operating oxygen amount value to achieve the purpose of reducing NO (NO) so as to achieve the purpose of reducing NO (NO) x The purpose of the emission concentration.
Preferably, the rated load is 20% to 50%.
As a preferred technical solution, the unit includes: the main air box is internally provided with at least 6 layers of reinforced ignition coal powder nozzles, fuel air is arranged around the coal powder nozzles, and the pressure difference of the main air box of the unit is 30-110mmH 2 O。
As the preferred technical scheme, arrange one deck auxiliary air spout between every adjacent two-layer buggy spout, the auxiliary air spout includes: the auxiliary air nozzles are arranged oppositely and have horizontal deflection angles.
As a preferred technical scheme, a layer of top combustion air door baffle and two layers of compact burnout air door baffles are arranged at the upper part of a main air box, and a layer of bottom combustion air door baffle and a layer of fire lower air door baffle are arranged at the lower part of the main air box.
As a preferred technical scheme, four layers of independent horizontally-swinging low-level burnout air door baffles are respectively arranged at the position 4.0-4.5 m away from the central line of the upper-layer combustor on the upper part of the main air box, and four layers of independent horizontally-swinging high-level burnout air door baffles are respectively arranged at the position 8.5-9.0 m away from the central line of the upper-layer combustor.
As a preferred technical scheme, the high-level burnout air door baffle is sequentially provided with an uppermost high-level burnout air baffle, a secondary upper high-level burnout air baffle, a middle high-level burnout air baffle and a lower high-level burnout air baffle from top to bottom along the height direction of the unit.
The method for controlling the opening of the air door baffle under deep peak shaving is simple to operate, and NO is reasonably controlled through the opening of the air door baffle on the premise of ensuring stable combustion of a unit x The emission concentration is controlled at a low level.
Drawings
FIG. 1 shows NO of the unit under rated load condition x A change data curve (which is not processed by the method for controlling the opening degree of the air door baffle under deep peak shaving);
FIG. 2 shows NO of the unit provided by the invention under rated load condition x The data curve (processed by the method for controlling the opening degree of the air door baffle under deep peak shaving) is changed.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It can be understood that the object of the present invention is achieved by some embodiments, and the present invention provides a method for controlling the opening of a damper flap under deep peak shaving, comprising the steps of:
s1, selecting data parameters, collecting and calling unit load parameters, economizer outlet oxygen quantity parameters and NO x The discharge concentration parameter, the opening degree parameter of the air door baffle and the flame signal parameter are used as deep peak regulation data;
s2, analyzing the deep peak regulation data, selecting parameters of the unit load under the rated load to perform key analysis, and analyzing the opening parameter of the air door baffle, the oxygen quantity parameter of the coal economizer outlet and NO x Analyzing the corresponding relation between the emission concentration parameter and the flame signal parameter to obtain analysis data;
NO under the condition of 20-50% of rated load x The emission concentration is in positive correlation with the oxygen quantity at the outlet of the economizer, namely the higher the oxygen quantity at the outlet of the economizer is, the NO is x The higher the emission concentration; the oxygen quantity at the outlet of the economizer is in an inverse correlation relation with the opening of the high-level overfire air baffle, namely the opening of the high-level overfire air baffle is large, and the oxygen quantity at the outlet of the economizer is reduced; the data analysis shows that under the condition of deep peak regulation, the flame signal is ensured not to flicker, and NO is controlled x The discharge concentration needs to be increased by adjusting the opening of the high-level over-fire air baffle, so that the running oxygen amount is reduced;
s3, modifying the logical control value of the opening degree of the damper, and determining the NO of the key damper opening degree according to the analysis data x The influence of the emission concentration is large, and the NO is reduced under deep peak regulation by repeatedly modifying the logical control value of the opening degree of the damper baffle for a plurality of times in the step S2 x The purpose of the emission concentration;
according to the analysis data, determining the opening degree of a secondary upper-layer high-level burn-up air baffle and the opening degree of an uppermost-layer high-level burn-up air baffle as the opening degrees of key air door baffles so as to realize control of NO under deep peak shaving x The concentration of the emissions;
s4, verifying an opening control curve of the air door baffle, considering stable combustion of the unit under deep peak regulation, calculating to obtain an opening value of the air door baffle through linear interpolation according to a logical control value of the opening of the air door baffle in a 20% -50% rated load interval of the unit, verifying the adaptability and solidifying of the opening control curve of the air door baffle, and controlling the opening of the air door baffle under the deep peak regulation;
the method comprises the steps that under the condition that a unit operates at 20% -50% rated load, under deep peak regulation, flame signals are stable, a preset operating oxygen amount value and an actual operating oxygen amount value of the unit in the rated load interval are collected, the difference value between the actual operating oxygen amount value and the preset operating oxygen amount value is calculated, a corresponding oxygen amount range is obtained through calculation of the difference value, a logical control value of the opening degree of an air door baffle is obtained according to the corresponding oxygen amount range through calculation of linear interpolation, the opening degree value of the air door baffle is obtained through calculation of the linear interpolation according to the logical control value of the opening degree of the air door baffle, the adaptability of an opening degree control curve of the air door baffle is verified and solidified according to the opening degree value of the air door baffle, the opening degree of the air door baffle under the deep peak regulation is controlled, and therefore the actual operating oxygen amount value is gradually reduced to the preset operating oxygen amount value so that NO reduction can be achieved x The purpose of the emission concentration.
The method for controlling the opening of the air door baffle under deep peak shaving is simple to operate, and NO is reasonably controlled through the opening of the air door baffle on the premise of ensuring stable combustion of a unit x The emission concentration is controlled at a low level.
The unit combustion mode adopts a TFS2000 combustion system, and the system design mainly aims at reducing the conversion of volatile nitrogen into NO x The main method is to establish early ignition and fuel/air staged combustion technology using controlled oxygen.
The main components of the unit include: the device comprises a compact overfire air door baffle (CCOFA), a horizontally-swinging separation overfire air door baffle (SOFA), an auxiliary air nozzle (CFS) with a preset horizontal deflection angle and a reinforced fired coal powder nozzle. The unit includes: the main bellows, be equipped with 6 at least layers in the main bellows and strengthen the buggy spout that catches fire, arranged the fuel wind around the buggy spout, arranged the supplementary wind spout of one deck between every adjacent two-layer buggy spout, supplementary wind spout includes: the auxiliary air nozzles are arranged in a horizontal deflection angle in an opposite mode; the upper part of the main air box is provided with a layer of top combustion air door baffle and two layers of compact burnout air door baffles, and the lower part of the main air box is provided with a layer of bottom combustion air door baffle and a layer of under-fire air door baffle; four layers of independent horizontally-swinging low-level burnout air door baffles are respectively arranged at the position 4.0-4.5 m away from the central line of the upper-layer burner on the upper part of the main air box, and four layers of independent horizontally-swinging high-level burnout air door baffles are respectively arranged at the position 8.5-9.0 m away from the central line of the upper-layer burner; the high-level burnout air door baffle is sequentially provided with an uppermost high-level burnout air baffle, a secondary upper high-level burnout air baffle, a middle high-level burnout air baffle and a lower high-level burnout air baffle from top to bottom along the height direction of the unit.
The air door baffle plates are numbered from bottom to top along the height direction of the unit in sequence: UFA, AA, A, ABA, AB, ABB, B, BCB, BC, BCC, C, CDC, CD, CDD, D, DED, DE, DEE, E, EFE, EF, EFF, F, FF, CCOFA, CCOFAB, LSOFA-A, LSOFA-B, LSOFA-C, LSOFA-D, HSOFA-A (lower upper overfire air baffle), HSOFA-B (middle upper overfire air baffle), HSOFA-C (lower upper overfire air door baffle) and HSOFA-D (upper overfire air door baffle), totaling 34 layers, wherein the proportion of overfire air in the secondary air volume is 40%. The center of the hearth of the unit forms an imaginary tangent circle which rotates clockwise when viewed from top to bottom.
The invention provides a method for controlling the opening of a damper under deep peak shaving, which comprises the following steps:
s1: selecting data parameters;
collecting and taking unit load parameters, economizer outlet oxygen quantity parameters and NO x The discharge concentration parameter, the opening degree parameter of the air door baffle and the flame signal parameter are used as deep peak regulation data;
s2: analyzing deep peak shaving data;
analyzing the deep peak regulation data, selecting parameters of the unit under the rated load condition for key analysis, and analyzing the opening parameter of the damper plate of the air door, the outlet oxygen quantity parameter of the coal economizer and NO x Analyzing the corresponding relation between the emission concentration parameter and the flame signal parameter to obtain analysis data;
at 20% to 50% of rated load conditions, NO is found from the data in FIG. 1 x The emission concentration is in positive correlation with the oxygen quantity at the outlet of the economizer, namely the higher the oxygen quantity is, the NO is x The higher the emission concentration, i.e. the higher the oxygen content at the exit of the economizer, the higher the NO x The higher the emission concentration, especially under low load conditions; historical data analysis also finds that the oxygen content at the outlet of the economizer is in an inverse correlation relation with the opening of a baffle (HSOFA-D) of a high-level burnout air door at the uppermost layer and the opening of a baffle (HSOFA-C) of a high-level burnout air door at a next upper layer, namely the opening of the baffle (HSOFA-D) of the high-level burnout air door at the uppermost layer and the opening of the baffle (HSOFA-C) of the high-level burnout air door at the next upper layer are increased, and the oxygen content at the outlet of the economizer is reduced; the data analysis shows that under the condition of deep peak regulation, the flame signal is ensured not to flicker, and the NO is controlled x The emission concentration needs to be increased by adjusting the opening degree of a high-level burnout air door baffle (HSOFA-D) at the uppermost layer and the opening degree of a high-level burnout air door baffle (HSOFA-C) at the next upper layer, so that the running oxygen amount is reduced;
s3: modifying the logical control value of the opening degree of the damper; the modification of the logical control value of the opening degree of the damper baffle plate determines the NO of the key damper baffle plate opening degree according to the analysis data x The influence of the emission concentration is large, and the NO is reduced under deep peak regulation by repeatedly modifying the logical control value of the opening degree of the damper baffle for a plurality of times in the step S2 x The purpose of the emission concentration;
according to the analysis data, determining the opening degree of a secondary upper high-level burnout air door baffle (HSOFA-C) and the opening degree of an uppermost high-level burnout air door baffle (HSOFA-D) as the opening degrees of key air door baffles so as to realize the control of NO under deep peak shaving x The concentration of the emissions;
and modifying the logical control value of the opening degree of the damper baffle by repeating the step S2 for a plurality of times, and specifically comprising the following steps:
when the unit is in operation, the pressure difference of the wind box of the unit hearth maintains the opening degree of the damper of the main combustion area (UFA, AA, A, ABA, AB, ABB, B, BCB, BC, BCC, C, CDC, CD, CDD, D, DED, DE, DEE, E, EFE, EF, EFF, F and FF) in a certain range, so that the flame signal does not flicker under deep peak regulation, and the control value of the pressure difference of the wind box of the unit hearth is 30-110mmH 2 O, shown in Table 1 below, for controlling ABA, AB, ABB,Opening degrees of the damper baffles such as BCB, BC, BCC, CDC, CD, CDD, DED, DE, DEE, EFE, EF and EFF;
TABLE 1 furnace bellows differential pressure control value
Figure BDA0003975561560000071
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Wherein, the control values of the opening degrees of the air door baffles of the UFA and AA of the bottom combustion air are shown in the following tables 2 to 3;
TABLE 2UFA/AA air door baffle opening control value (A coal mill during operation)
Figure BDA0003975561560000072
TABLE 3UFA/AA air door baffle opening control value (A coal pulverizer not in operation)
Figure BDA0003975561560000073
The opening control values of the air door baffles of the perimeter air doors A, B, C, D and E are shown in the following table 4;
TABLE 4 control values for fuel-air (perimeter-air) door shutters
Figure BDA0003975561560000081
Opening control values of the top-fired air door baffle FF and the compact overfire air door baffle CCOFA are shown in tables 5 to 6;
TABLE 5FF/CCOFA damper opening control value (F coal pulverizer in service)
Figure BDA0003975561560000082
TABLE 6FF/CCOFA damper opening control value (F when the coal pulverizer is not in operation)
Figure BDA0003975561560000083
The control values of the baffle opening of the low burnout damper (LSOFA) are shown in Table 7;
TABLE 7 Low burnout damper (LSOFA) baffle control values
Figure BDA0003975561560000084
The control values of the air door baffle opening degrees of the high-level overfire air HSOFA-A and HSOFA-B are shown in the table 8;
TABLE 8 high burnout damper (HSOFA-A, HSOFA-B) baffle control values
Figure BDA0003975561560000085
Analyzing the data, and controlling NO under deep peak shaving by using the opening of the secondary upper-layer high-level burn-up air baffle and the opening of the uppermost-layer high-level burn-up air baffle as the opening of the key air door baffle according to the analyzed data x The difference value between the measured value of the operating oxygen amount and the preset value of the operating oxygen amount is used for calculating the logical control value of the opening degree of the air door baffle as shown in the following table 8, and the logical control value of the opening degree of the air door baffle after the calculation is specifically modified as shown in tables 9 to 10;
TABLE 8 logical control value of damper opening degree calculated from difference between measured value of oxygen content and preset value of oxygen content
Figure BDA0003975561560000091
TABLE 9HSOFA-C baffle opening degree logic control values
Figure BDA0003975561560000092
TABLE 10HSOFA-D flapper OPEN DOOR LOGIC CONTROL VALUES
Figure BDA0003975561560000093
S4: verifying an opening control curve of the optimal air door baffle;
the rated load is preferably 30-50%, and when the unit operates at 30-50% of rated load and under deep peak regulation, the flame signal is stable, but NO is x The discharge concentration level is 310mg/m 3 ～350mg/m 3 (as shown in fig. 1); at the moment, under the rated load, the preset value of the collected running oxygen amount is 5.50%, the actual value of the collected running oxygen amount is 7.80%, the difference value between the actual value of the running oxygen amount and the preset value of the running oxygen amount is 7.80% -5.00% =2.80%, the corresponding oxygen amount range is obtained through difference value calculation, the calculation formula corresponding to the 21.0% oxygen amount range is 2.80%/21.0% =13.3%, the logical control value of the opening degree of the air door damper is obtained through linear interpolation calculation according to table 8 for the corresponding range, the logical control value of the opening degree of the air door damper is 30: (13.3-10)/90 = 50.1, at the moment, according to table 9, the logical control value of the opening degree of the air door damper of the next upper-level burnout air door damper (OFA-C) is calculated through linear interpolation, the opening degree of the air door damper is 100%, the control flap of the next upper-level high burnout air door damper (OFA-C) is adjusted and fully opened, at the next-upper-level burnout air door damper is adjusted to the preset value (OFA-C), the initial value of the upper-open air door damper is adjusted and the upper-10, the logical control flap is adjusted to the initial value of the upper-open the upper-up air door damper (OFA) and the calculated according to the preset value of the next-5.5.5.5.5.5.5.5.5.5.5.5% of the upper burnout damper, thereby reducing the upper burnout damper to the upper burnout damper x The purpose of discharging concentration is to verify the adaptability and solidification of the control curve of the opening degree of the air door baffle according to the opening degree value of the air door baffle, and when the unit operates at 30-50% rated load, the flame signal is stable, and NO is reduced under deep peak regulation x The discharge concentration level is 145mg/m 3 ～175mg/m 3 As shown in fig. 2, which facilitates control of ammonia slip. From FIG. 2, we can observe the depth of the inventionThe method for controlling the opening degree of the damper under peak shaving can reduce NO x Therefore, the method for controlling the opening degree of the air door baffle under deep peak shaving provided by the invention can reasonably control the NO at the denitration inlet by the opening degree of the air door baffle on the premise of ensuring the stable combustion of the unit x The control is at a lower level.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all modifications and equivalents falling within the scope of the appended claims. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. A method for controlling the opening degree of a damper under deep peak shaving is characterized by comprising the following steps:
s1, selecting data parameters, collecting and calling unit load parameters, economizer outlet oxygen quantity parameters and NO x The discharge concentration parameter, the opening degree parameter of the air door baffle and the flame signal parameter are used as deep peak regulation data;
s2, analyzing the deep peak regulation data, selecting parameters of the unit under rated load operation for key analysis, and analyzing the opening parameter of the air door baffle, the outlet oxygen quantity parameter of the economizer and NO x Analyzing the corresponding relation between the emission concentration parameter and the flame signal parameter to obtain analysis data;
s3, modifying the logical control value of the opening degree of the damper, and determining the NO of the key damper opening degree according to the analysis data x DischargingThe influence degree of the concentration is reduced by repeating the step S2 for multiple times to modify the logical control value of the opening degree of the damper to reduce NO under deep peak regulation x The purpose of the emission concentration;
s4, verifying the opening control curve of the air door baffle, considering stable combustion of the unit under deep peak shaving, calculating the logical control value of the opening of the air door baffle through linear interpolation under the rated load operation condition of the unit, verifying the adaptability and solidifying of the opening control curve of the air door baffle according to the opening value of the air door baffle, and controlling the opening of the air door baffle under the deep peak shaving.
2. The method for controlling the opening of the damper door under deep peak shaving according to claim 1, wherein the step S2 of analyzing the deep peak shaving data specifically comprises the following steps: NO under rated load operation condition of the unit x The discharge concentration and the oxygen amount at the outlet of the economizer are in a positive correlation, and the oxygen amount at the outlet of the economizer and the opening of the high-level over-fire air baffle are in an inverse correlation.
3. The method for controlling the opening of the lower damper flap for deep peak shaving according to claim 1, wherein in step S3, the opening of the next upper high-level overfire air flap and the opening of the uppermost high-level overfire air flap are determined as key damper flaps according to the analysis data so as to control the opening of the lower damper flap for deep peak shaving x The concentration of the emission.
4. The method for controlling the opening degree of the air door baffle under the deep peak shaving according to claim 1, wherein the verification of the control curve of the opening degree of the air door baffle in the step S4 specifically comprises the following steps: the method comprises the steps that under the condition of rated load operation of a unit, under deep peak regulation, flame signals are stable, a preset operating oxygen amount value and an actual operating oxygen amount value of the unit in a rated load interval are collected, the difference value between the actual operating oxygen amount value and the preset operating oxygen amount value is calculated, a corresponding oxygen amount range is obtained through difference calculation, a logical control value of the opening degree of an air door baffle plate is obtained through the corresponding oxygen amount range according to linear interpolation calculation, and the logical control value of the opening degree of the air door baffle plate is obtained through the linear interpolation according to the logical control value of the opening degree of the air door baffle plateCalculating to obtain an opening value of the air door baffle, verifying the adaptability of an opening control curve of the air door baffle according to the opening value of the air door baffle, solidifying the opening control curve, and controlling the opening of the air door baffle under deep peak shaving so as to gradually reduce the actual value of the running oxygen to a preset value of the running oxygen so as to reduce NO x The purpose of the emission concentration.
5. The method of controlling the opening of a damper flap under deep peaking according to claim 1, wherein the rated load is 20% to 50%.
6. The method for controlling the opening of the lower damper flap according to claim 1, wherein the unit includes: the main air box is internally provided with at least 6 layers of reinforced ignition coal powder nozzles, fuel air is arranged around the coal powder nozzles, and the pressure difference of the main air box of the unit is 30-110mmH 2 O。
7. The method for controlling the opening degree of the air door baffle under the deep peak shaving according to claim 6, wherein one layer of auxiliary air nozzles are arranged between every two adjacent layers of pulverized coal nozzles, and each auxiliary air nozzle comprises: and the auxiliary air nozzles are arranged in opposite horizontal deflection angles.
8. The method of claim 7, wherein a top-firing damper flap and two compact burn-out damper flaps are provided on the top of the main air box, and a bottom-firing damper flap and a underfire damper flap are provided on the bottom of the main air box.
9. The method for controlling the opening of the lower air door baffle in the deep peak shaving according to claim 8, wherein four layers of independent horizontally-swingable low-level burnout air door baffles are respectively arranged at positions 4.0-4.5 m away from the central line of the upper-layer burner at the upper part of the main air box, and four layers of independent horizontally-swingable high-level burnout air door baffles are respectively arranged at positions 8.5-9.0 m away from the central line of the upper-layer burner.
10. The method for controlling the opening of the lower air door baffle with the deep peak shaving according to claim 9, wherein the high-level burnout air door baffle is sequentially provided with an uppermost high-level burnout air baffle, a next upper high-level burnout air baffle, a middle high-level burnout air baffle and a lower high-level burnout air baffle from top to bottom along the height direction of the unit.
CN202211530352.9A 2022-12-01 2022-12-01 Method for controlling opening degree of air door baffle under deep peak shaving Pending CN115930255A (en)

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