CN112856474B - A self-adaptive intelligent control system and method for constant air leakage under all working conditions - Google Patents
A self-adaptive intelligent control system and method for constant air leakage under all working conditions Download PDFInfo
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- CN112856474B CN112856474B CN202110264275.6A CN202110264275A CN112856474B CN 112856474 B CN112856474 B CN 112856474B CN 202110264275 A CN202110264275 A CN 202110264275A CN 112856474 B CN112856474 B CN 112856474B
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- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 abstract description 9
- 239000003245 coal Substances 0.000 abstract description 4
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- 238000007781 pre-processing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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- 238000002485 combustion reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/02—Arrangements of regenerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/006—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for regenerative heat-exchange apparatus
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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
本发明公开了一种全工况恒定漏风量自适应智能控制系统及方法，将热端扇形板和冷端扇形板相结合，实现了当前机组负荷变化频繁情况下综合控制冷热端密封间隙，其中，通过激光传感器采集冷热端转子形变量，通过温度传感器建立不同负荷下转子变形的温度场，得出转子径向方向上各个点的形变量，以建立工况不同负荷下转子的转子形变模型，寻找最优控制位置分别驱动热端扇形板和冷端扇形板至最佳控制位，分别驱动热端扇形板和冷端扇形板至最佳控制位，保证热端和冷端密封间隙同时达到最小安全间隙，达到冷热端综合漏风率最佳状态，从而降低锅炉煤耗和厂用电，达到节能环保的目的。
The present invention discloses an adaptive intelligent control system and method for a constant air leakage volume under all working conditions, which combines a hot end fan-shaped plate and a cold end fan-shaped plate, and realizes comprehensive control of the hot and cold end sealing gaps under the current condition of frequent load changes of the unit, wherein the deformation quantities of the hot and cold end rotors are collected by a laser sensor, and a temperature field of rotor deformation under different loads is established by a temperature sensor, and the deformation quantities of each point in the radial direction of the rotor are obtained, so as to establish a rotor deformation model of the rotor under different loads under working conditions, find the optimal control position, and respectively drive the hot end fan-shaped plate and the cold end fan-shaped plate to the optimal control position, respectively drive the hot end fan-shaped plate and the cold end fan-shaped plate to the optimal control position, ensure that the hot end and the cold end sealing gaps simultaneously reach the minimum safety gap, and reach the optimal state of the comprehensive air leakage rate of the hot and cold ends, thereby reducing the coal consumption of the boiler and the power consumption of the plant, and achieving the purpose of energy saving and environmental protection.
Description
Technical Field
The invention belongs to the technical field of boiler heat exchange, and particularly relates to a full-working-condition constant air leakage self-adaptive intelligent control system and method.
Background
The boiler plant is one of three major plants in a thermal power plant. An air preheater is one of the important parts of a boiler, and is a heat exchange device for heating air for boiler combustion by utilizing the tail flue gas temperature of the boiler, and is a main waste heat recovery device in a boiler system.
In the normal operation process of the air preheater, the rotor generates mushroom-shaped deformation under the action of high temperature and dead weight. The air leakage gaps among the cold end sector plate and the hot end sector plate of the air preheater and the rotor are continuously changed, so that the generated air leakage has great negative influence on the running efficiency of the air preheater and the running efficiency of the fan unit.
At present, several domestic air preheater air leakage control systems are arranged at the hot end of the air preheater and are mainly used for controlling a hot end sector plate, the basic transmission principle of the air preheater is generally consistent, and a motor drives two spiral lifters to synchronously move so as to lift the sector plate to move up and down. The fan-shaped plate at the cold end is fixed, the gap between the fan-shaped plate at the cold end and the radial sealing piece at the cold end of the rotor is set when the air preheater is installed, but when the air preheater is actually operated, the deviation exists between the actual deformation quantity of the rotor and the theoretical design, and the air leakage quantity at the cold end cannot be effectively controlled. The current unit has rapid load change frequency, and the change of the gap between the cold end and the hot end is also relatively large, so how to comprehensively and efficiently control the simultaneous actions of the fan-shaped plates of the cold end and the hot end, and optimize the air leakage gap of the fan-shaped plates of the cold end and the hot end in each load interval is a subject of common research of the industry personnel.
Disclosure of Invention
The invention provides a full-working-condition constant air leakage self-adaptive intelligent control system and method for solving the technical problems, which realize comprehensive synchronous and optimal control of gaps of fan-shaped plates at cold and hot ends in each load zone and keep the gap value of the cold and hot ends at an optimal gap position.
In order to solve the problems, the technical scheme of the invention is as follows:
the self-adaptive intelligent control system for automatically adjusting the gap value between a fan-shaped plate at the cold end and the hot end of an air preheater and a rotor angle steel plane comprises a ranging sensor, an absolute displacement sensor, a temperature sensor, a processing controller and a fan-shaped plate adjusting device, wherein the ranging sensor, the absolute displacement sensor, the temperature sensor and the fan-shaped plate adjusting device are respectively arranged at the cold end and the hot end of the air preheater;
the temperature sensor is used for detecting the temperature of each measuring point of the cold and hot end of the air preheater, so as to obtain a temperature field from the central cylinder position to the outer side of the rotor of the air preheater, the distance measuring sensor is used for detecting the deformation quantity of the rotor of the cold and hot end of the air preheater, and the absolute displacement sensor is used for detecting the absolute position of the fan-shaped plate of the cold and hot end;
The processing controller is used for combining the rotor deformation quantity and the temperature field to obtain the minimum thermal deformation quantity of the cold and hot ends of the air preheater, performing curve fitting according to the minimum thermal deformation quantity corresponding to the temperatures of different load sections of working conditions to obtain a rotor deformation model, and controlling the sector plate adjusting device to automatically adjust the gap value between the sector plate of the cold and hot ends of the air preheater and the angle steel plane of the rotor according to the rotor deformation model and the absolute position.
According to an embodiment of the invention, the processing controller is further configured to automatically correct the rotor deformation model based on the rotor deformation detected in real time and the motor current of the air preheater.
According to an embodiment of the invention, the processing controller is further configured to protect the air preheater according to the deformation amount of the rotor.
According to an embodiment of the present invention, the temperature field is a full rotor temperature field having a longitudinal temperature distribution, an axial temperature distribution, and a circumferential temperature distribution centered on the central cylinder axis.
According to one embodiment of the invention, the sector plate adjusting device is a spiral lifter, the absolute displacement sensor is a linear potentiometer, the distance measuring sensor is a laser sensor, the temperature sensor at the hot end of the air preheater is a thermocouple sensor, the temperature sensor at the cold end of the air preheater is an infrared sensor, and the linear potentiometer is arranged at the top of the spiral lifter.
According to an embodiment of the invention, the device further comprises an up-down limit switch for limiting the up-down maximum travel of the sector plate.
A self-adaptive intelligent control method for constant air leakage under all working conditions comprises the following steps:
S1, acquiring a temperature field from a central cylinder position to the outer side of a rotor of an air preheater, a rotor deformation amount of a cold end and a hot end fan-shaped plate of the air preheater and an absolute position of the cold end and the hot end fan-shaped plate;
S2, combining the deformation quantity of the rotor with the temperature field to obtain the minimum thermal deformation quantity of the cold and hot ends of the air preheater;
S3, dividing the full working condition into a plurality of load sections, and performing curve fitting according to the minimum thermal deformation corresponding to the temperatures of different load sections of the working condition to obtain a rotor deformation model;
And S4, automatically adjusting the clearance value between the fan-shaped plate at the cold and hot ends of the air preheater and the angle steel plane of the rotor according to the deformation model and the absolute position of the rotor.
According to an embodiment of the present invention, step S4 further includes:
s41, obtaining a minimum gap of a cold end and a hot end of the air preheater according to a rotor deformation model and an absolute position;
S42, comparing the minimum gap with a preset set gap, wherein if the minimum gap is larger than the set gap, the gap value is reduced, and if the minimum gap is smaller than the set gap, the gap value is increased.
According to an embodiment of the invention, step S4 further comprises automatically correcting the rotor deformation model based on the rotor deformation detected in real time and the motor current of the air preheater.
According to an embodiment of the present invention, in step S1, acquiring a temperature field of the air preheater from the center barrel position to the outside of the rotor further comprises:
and detecting the temperature of each measuring point of the cold and hot end of the air preheater, and establishing a full rotor temperature field of the air preheater by taking the central cylinder axis as the central longitudinal temperature distribution, the axial temperature distribution and the circumferential temperature distribution.
Compared with the prior art, the invention has the following advantages and positive effects:
in order to keep the air leakage rate of the air preheater in an optimal constant state all the time in different load intervals of the unit, the system collects the deformation quantity of the rotor at the cold end and the hot end through the ranging sensor and the temperature field of the rotor through the temperature sensor so as to establish a rotor deformation model of the rotor under different loads of working conditions, find an optimal control position to drive the hot end sector plate and the cold end sector plate to the optimal control position respectively, and ensure that the sealing gap between the hot end and the cold end reaches the minimum safety gap at the same time, thereby reducing the coal consumption of the boiler and the power consumption of the factory and achieving the purposes of energy conservation and environmental protection;
The invention combines the hot end sector plate and the cold end sector plate, divides the system into a plurality of load sections, establishes the temperature fields, takes the central cylinder axis as the center for temperature field distribution, has longitudinal distribution and axial distribution for each corner section, calculates circumferential temperature distribution, can establish a full rotor temperature field, obtains deformation of each point in the radial direction of the rotor, finally fits a temperature deformation model between the load, the temperature and the minimum rotor deformation of the cold and hot ends, automatically controls according to the fitted load, the temperature and the minimum rotor deformation curve, automatically puts the cold and hot end sector plate to the optimal position, and in addition, carries out on-line correction in real time in an auxiliary mode according to the rotor deformation detected by the laser sensor and the motor current of the air preheater, reduces the error of gap control, and achieves the optimal state of the comprehensive air leakage rate of the cold and hot ends.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic diagram of a full-condition constant air leakage self-adaptive intelligent control system;
FIG. 2 is a schematic circuit diagram of an all-condition constant air leakage self-adaptive intelligent control system;
fig. 3 is a schematic flow chart of a full-working-condition constant air leakage self-adaptive intelligent control method.
Reference numerals illustrate:
1-distance measuring sensor, 2-absolute displacement sensor and 3-sector plate regulating device.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
The invention provides a full-working-condition constant air leakage self-adaptive intelligent control system and a full-working-condition constant air leakage self-adaptive intelligent control method, which are further described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, the application provides a full-working-condition constant air leakage self-adaptive intelligent control system, which is used for automatically adjusting the gap value between a fan-shaped plate at the cold end and the hot end of an air preheater and a rotor angle steel plane, and comprises a ranging sensor 1, an absolute displacement sensor 2, a temperature sensor, a processing controller and a fan-shaped plate adjusting device 3, wherein the ranging sensor 1, the absolute displacement sensor 2, the temperature sensor and the fan-shaped plate adjusting device 3 are respectively arranged at the cold end and the hot end of the air preheater;
The temperature sensor is used for detecting the temperature of each measuring point of the cold and hot end of the air preheater to obtain a temperature field from the central cylinder position to the outer side of the rotor of the air preheater, the ranging sensor 1 is used for detecting the deformation quantity of the rotor of the cold and hot end of the air preheater, and the absolute displacement sensor 2 is used for detecting the absolute position of the fan-shaped plate of the cold and hot end;
The processing controller is used for combining the rotor deformation quantity and the temperature field to obtain the minimum thermal deformation quantity of the cold and hot ends of the air preheater, performing curve fitting according to the minimum thermal deformation quantity corresponding to the temperatures of different load sections of working conditions to obtain a rotor deformation model, and controlling the sector plate adjusting device 3 to automatically adjust the gap value between the sector plate of the cold and hot ends of the air preheater and the angle steel plane of the rotor according to the rotor deformation model and the absolute position.
The present embodiment will now be described in detail, but is not limited thereto.
According to the embodiment, the deformation condition of the air preheater rotor under the full-load working condition of the unit is researched, the relation between the intelligent self-learning temperature and the deformation of the rotor is constructed, and the rotor deformation model is constructed, so that the fan-shaped plate of the refrigerating and heating end adaptively follows the action, and the air leakage quantity of the air preheater under each working condition is always kept in an optimal constant state.
Because the degree of the thermal deformation of the rotor in the air preheater is different when the unit is under different loads, the gap between the hot end sector plate and the rotor radial sealing piece and the gap between the cold end sector plate and the cold end radial sealing piece are necessarily caused to have corresponding relations. The hot end air leakage gap is gradually increased along with the continuous increase of the unit load, and the cold end air leakage is gradually reduced, otherwise, when the unit load is continuously reduced, the hot end air leakage gap is gradually reduced, and the cold end air leakage is gradually increased. In order to keep the air leakage rate of the air preheater in an optimal constant state all the time in different load intervals of the unit, the full-working-condition constant air leakage rate self-adaptive intelligent control system of the embodiment comprises a ranging sensor, an absolute displacement sensor, a temperature sensor, a processing controller and a sector plate adjusting device, and specifically:
According to the embodiment, the laser sensors are respectively arranged on the hot end sector plate and the cold end sector plate, laser beams are directly irradiated to the rotor angle steel plane, the laser sensors are utilized to realize non-contact remote measurement, the positions of the laser beams on the receiving element are processed through analog and digital circuits and analyzed through a microprocessor, corresponding output values are calculated, standard 4-20mA measurement signals are output in proportion in an analog quantity window set by a user, the data acquisition and analysis device is used for preprocessing, the rotor deformation quantity of the cold end is calculated, and the effects of real-time detection and real-time tracking can be achieved.
In the embodiment, temperature measuring points are respectively arranged at the cold end and the hot end, the thermocouple sensors are adopted for temperature acquisition at the hot end measuring points, the infrared sensors are adopted for temperature acquisition at the cold end, and temperature data of all measuring points are combined to establish temperature fields from the central cylinder position of the air preheater to the outer side of the rotor under different loads. Further preferably, in this embodiment, a full rotor temperature field is established by using the central cylinder axis as the central longitudinal temperature distribution, the axial temperature distribution and the circumferential temperature distribution, so as to obtain the thermal deformation of each point in the radial direction of the rotor, thereby screening the minimum deformation of the cold and hot ends.
The sector plate adjusting device of this embodiment adopts spiral elevator, realizes the lift adjustment of sector plate through the motor lead screw, wherein, through the accurate control of this control motor's operating time and rotation direction concrete realization lift distance. The absolute displacement sensor of the embodiment obtains the absolute position of the sector plate according to the analog quantity signal fed back by the linear potentiometer. Further, the absolute displacement sensor is arranged at the top of the spiral lifter by utilizing the anti-rotation function of the screw rod of the spiral lifter, so that the absolute displacement sensor is used for accurately detecting the actual position of the sector plate, the clearance value between the sector plate and the rotor sealing sheet is obtained through the deformation of the rotor detected by the distance measuring sensor, and the processing controller outputs an up-and-down action command to drive the motor of the sector plate adjusting device to operate. Preferably, the embodiment further comprises an up limit switch and a down limit switch, which are used for limiting the maximum up and down travel of the sector plate.
The processing controller of the embodiment combines the deformation amount of the cold end rotor collected by the ranging sensor and the temperature field collected by the temperature sensor to determine the thermal deformation amount of each position in the radial direction of the rotor, divides the full working condition into a plurality of load sections, establishes rotor deformation models of rotor deformation under different load sections through curve fitting, searches the optimal control position through the absolute positions collected by the rotor deformation models and the absolute displacement sensor, and respectively drives the sector plate adjusting device to automatically adjust the hot end sector plate and the cold end sector plate to the optimal control position so as to ensure that the sealing gap of the hot end and the cold end simultaneously reaches the minimum safety gap, thereby reducing the coal consumption of the boiler and the power consumption of factories and achieving the purposes of energy conservation and environmental protection. Specifically, referring to fig. 2, the processing controller of the present embodiment is connected with each sensor signal of the cold and hot end through a data acquisition module, acquires output signals of each sensor, and performs data preprocessing. Preferably, the processing controller is further configured to automatically correct the rotor deformation model according to the rotor deformation detected in real time and the motor current of the air preheater, wherein the rotor deformation obtained by the ranging sensor is not only used for correcting the model function relationship, but also used for protecting the system from the adjustment overrun.
In order to keep the air leakage rate of the air preheater in an optimal constant state all the time in different load intervals of the unit, the system collects the deformation quantity of the rotor at the cold end and the hot end through the ranging sensor and the temperature field of the rotor through the temperature sensor so as to establish a rotor deformation model of the rotor under different loads of working conditions, find an optimal control position to drive the hot end sector plate and the cold end sector plate to the optimal control position respectively, ensure that the sealing gap between the hot end and the cold end reaches the minimum safety gap simultaneously, and further reduce the coal consumption of the boiler and the power consumption of the factory, and achieve the purposes of energy conservation and environmental protection.
The system of the embodiment has an intelligent self-learning function, self-learning of the system is carried out for a period of time, data acquisition analysis and intelligent self-learning are combined to accumulate rotor deformation historical data of each load interval, wherein a hot end sector plate and a cold end sector plate are combined, the system is divided into a plurality of load sections, a temperature field is established, the temperature field distribution is provided with longitudinal distribution and axial distribution for each corner section by taking a central cylinder axis as a center, circumferential temperature distribution is calculated, a full-rotor temperature field can be established, deformation of each point in the radial direction of a rotor is obtained, finally, a temperature deformation model between load, temperature and a cold and hot end minimum rotor deformation is fitted, automatic control is carried out according to the fitted load, temperature and the minimum rotor deformation curve, the cold and hot end sector plates are automatically put into an optimal position, in addition, on-line correction is carried out in real time in an auxiliary mode according to the rotor deformation detected by a laser sensor and the motor current of an air preheater, the error of gap control is reduced, and the optimal state of the comprehensive air leakage rate of the cold and hot ends is achieved.
Referring to fig. 3, the application also provides a full-working-condition constant air leakage quantity self-adaptive intelligent control method based on the embodiment, which comprises the following steps:
S1, acquiring a temperature field from a central cylinder position to the outer side of a rotor of an air preheater, a rotor deformation amount of a cold end and a hot end fan-shaped plate of the air preheater and an absolute position of the cold end and the hot end fan-shaped plate;
S2, combining the deformation quantity of the rotor with the temperature field to obtain the minimum thermal deformation quantity of the cold and hot ends of the air preheater;
S3, dividing the full working condition into a plurality of load sections, and performing curve fitting according to the minimum thermal deformation corresponding to the temperatures of different load sections of the working condition to obtain a rotor deformation model;
And S4, automatically adjusting the clearance value between the fan-shaped plate at the cold and hot ends of the air preheater and the angle steel plane of the rotor according to the deformation model and the absolute position of the rotor.
The present embodiment will now be described in detail, but is not limited thereto.
According to the embodiment, the temperature sensor is used for measuring the temperature of the rotor of the air preheater in real time, a temperature field from the central cylinder position of the air preheater to the outer side of the rotor is obtained, the laser sensor arranged on the outer side is combined to detect the deformation quantity of the rotor on the outer side, the thermal deformation quantity of each position in the radial direction of the rotor is calculated, and therefore the minimum thermal deformation quantity of the cold and hot ends is screened. Preferably, the temperature of each measuring point of the cold and hot ends of the air preheater is detected, and a full rotor temperature field of the air preheater is established by taking the central cylinder axis as the center for longitudinal temperature distribution, axial temperature distribution and circumferential temperature distribution.
In this embodiment, the full working condition is divided into N load segments, and the minimum thermal deformation amounts S L and S R of the cold and hot ends corresponding to the N load segments are calculated by the above method, specifically, in this embodiment, the minimum thermal deformation amounts of Leng Reduan in one minute are calculated respectively according to the driving rotation speed of the air preheater (S L1SL2SL3......SL120)/(SR1SR2SR3......SR120), and curve fitting is performed on the temperatures of the N load segments and the minimum thermal deformation amounts, so as to obtain a functional relationship between the temperatures and the minimum thermal deformation amounts, that is, a rotor deformation model. Preferably, the functional relation is corrected in real time according to the current alarm feedback signal of the air preheater, and the rotor deformation model is automatically corrected according to the rotor deformation quantity detected in real time.
The step S4 further comprises the steps of S41, obtaining the minimum gap of the cold end and the hot end of the air preheater according to the deformation model and the absolute position of the rotor, S42, comparing the minimum gap with a preset gap, adjusting the gap value if the minimum gap is larger than the preset gap, and adjusting the gap value if the minimum gap is smaller than the preset gap. Specifically, according to the rotor deformation model, the embodiment can obtain a safe minimum thermal deformation amount at any load section corresponding to any working condition, and the safe minimum thermal deformation amount is calculated with fan-shaped plate positions X L1 and X R1 fed back by an absolute displacement sensor to obtain minimum gap values J Lmin and J Rmin of the cold and hot ends respectively, and compared with gap set values J Lset and J Rset. If J Lmin or J Rmin is larger than a preset clearance value J Lset or J Rset, the system judges that the clearance is large, the processing controller sends a downlink instruction to drive the sector plate to move downwards, t is taken as the downlink time of the motor, t= -J Lmin-JLset -/V, wherein V is the movement speed of the sector plate, otherwise, if J Lmin or J Rmin is smaller than a preset clearance value J Lset or J Rset, the system judges that the clearance is small, the processing controller sends an uplink instruction to drive the sector plate to move upwards, t is taken as the uplink time of the motor, and t= -J Lmin-JLset -/V ensures that the sector plate and the rotor plane are in the preset optimal clearance. Preferably, the gap value of the cold end and the hot end in the same load section is compared with the initial position of the installation design, and if the gap value deviation of the hot end and the cold end is larger than the design deviation value, the fan-shaped plates of the cold end and the hot end are independently and automatically thrown and the optimization curve is automatically corrected according to the actual throwing position and the motor current of the air preheater, so that the optimal comprehensive air leakage rate under all working conditions is achieved under the condition of ensuring the safe operation of the air preheater.
The on-site actual operation result shows that the control system and the method have good adaptability, stability and control precision, the control effect is obviously better than single-end independent control, and the control system and the method have wide application prospect in the air preheater of the large-scale power station boiler.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.
Claims (7)
1. The full-working-condition constant air leakage self-adaptive intelligent control device is characterized by comprising a ranging sensor, an absolute displacement sensor, a temperature sensor, a processing controller and a sector plate adjusting device, wherein the ranging sensor, the absolute displacement sensor, the temperature sensor and the sector plate adjusting device are respectively arranged at the cold end and the hot end of the air preheater;
The temperature sensor is used for detecting the temperature of each measuring point of the cold and hot end of the air preheater to obtain a temperature field from the central cylinder position to the outer side of the rotor of the air preheater, wherein the temperature field is a full-rotor temperature field which takes the central cylinder axis as the central longitudinal temperature distribution, the axial temperature distribution and the circumferential temperature distribution;
the processing controller is used for combining the rotor deformation quantity and the temperature field to obtain the minimum thermal deformation quantity of the cold and hot ends of the air preheater, performing curve fitting according to the minimum thermal deformation quantity corresponding to the temperatures of different load sections of working conditions to obtain a rotor deformation model, and controlling the sector plate adjusting device to automatically adjust the gap value between the sector plate of the cold and hot ends of the air preheater and the angle steel plane of the rotor according to the rotor deformation model and the absolute position;
The processing controller is also used for automatically correcting the rotor deformation model according to the rotor deformation detected in real time and the motor current of the air preheater;
the fan-shaped plate adjusting device is a spiral lifter, the absolute displacement sensor is a linear potentiometer, the ranging sensor is a laser sensor, the temperature sensor at the hot end of the air preheater is a thermocouple sensor, the temperature sensor at the cold end of the air preheater is an infrared sensor, and the linear potentiometer is arranged at the top of the spiral lifter.
2. The full-condition constant air leakage self-adaptive intelligent control device according to claim 1, wherein the processing controller is further used for protecting the air preheater according to the deformation amount of the rotor.
3. The full-condition constant air leakage self-adaptive intelligent control device according to claim 1, further comprising an up-down limit switch for limiting the up-down maximum stroke of the sector plate.
4. A method of using the all-condition constant air leakage adaptive intelligent control device according to any one of claims 1 to 3, comprising the steps of:
S1, acquiring a temperature field from a central cylinder position to the outer side of a rotor of an air preheater, a rotor deformation amount of a cold end and a hot end fan-shaped plate of the air preheater and an absolute position of the cold end and the hot end fan-shaped plate;
S2, combining the rotor deformation quantity and the temperature field to obtain the minimum thermal deformation quantity of the cold and hot ends of the air preheater;
s3, dividing the full working condition into a plurality of load sections, and performing curve fitting according to the minimum thermal deformation corresponding to the temperatures of different load sections of the working condition to obtain a rotor deformation model;
And S4, automatically adjusting the clearance value between the fan-shaped plate at the cold and hot ends of the air preheater and the angle steel plane of the rotor according to the rotor deformation model and the absolute position.
5. The method for adaptive intelligent control of constant air leakage under all conditions according to claim 4, wherein the step S4 further comprises:
s41, obtaining a minimum gap of a cold end and a hot end of the air preheater according to the rotor deformation model and the absolute position;
S42, comparing the minimum gap with a preset set gap, namely, adjusting the gap value to be smaller if the minimum gap is larger than the set gap, and adjusting the gap value to be larger if the minimum gap is smaller than the set gap.
6. The method for adaptively controlling the air leakage rate under the constant conditions according to claim 4 or 5, wherein the step S4 further comprises automatically correcting the rotor deformation model according to the rotor deformation detected in real time and the motor current of the air preheater.
7. The method for adaptively controlling the air leakage rate under the constant operating conditions according to claim 4, wherein in the step S1, the step of obtaining the temperature field from the central cylinder position to the outer side of the rotor of the air preheater further comprises:
and detecting the temperature of each measuring point of the cold and hot end of the air preheater, and establishing a full rotor temperature field of the air preheater by taking the central cylinder axis as the central longitudinal temperature distribution, the axial temperature distribution and the circumferential temperature distribution.
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| CN104019695A (en) * | 2014-06-27 | 2014-09-03 | 上海市东方海事工程技术有限公司 | Laser-type air pre-heater air leakage control system and control method thereof |
| CN214468755U (en) * | 2021-03-11 | 2021-10-22 | 上海市东方海事工程技术有限公司 | All-condition constant air leakage self-adaptive intelligent control system |
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| GB2400646B (en) * | 2003-04-15 | 2005-05-25 | Howden Power Ltd | Ljungstrom heat exchanger and method of controlling the gap between the rotor and the hot end sector plate |
| CN102278767B (en) * | 2010-06-12 | 2013-09-11 | 上海市东方海事工程技术有限公司 | Air leakage control system and control method for air pre-heater |
| CN203010656U (en) * | 2012-11-01 | 2013-06-19 | 北京国电龙源环保工程有限公司 | Sealing gap control device of rotary air preheater |
| CN204421054U (en) * | 2015-02-03 | 2015-06-24 | 彭可 | A kind of air preheater cold and hot end fanning strip synchronous follow-up device |
| CN105486162B (en) * | 2015-12-31 | 2018-05-18 | 上海市东方海事工程技术有限公司 | A kind of optical fiber type air preheater air leak control system and its control method |
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| CN104019695A (en) * | 2014-06-27 | 2014-09-03 | 上海市东方海事工程技术有限公司 | Laser-type air pre-heater air leakage control system and control method thereof |
| CN214468755U (en) * | 2021-03-11 | 2021-10-22 | 上海市东方海事工程技术有限公司 | All-condition constant air leakage self-adaptive intelligent control system |
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