CN110566928B - Automatic control method, device, equipment and medium for industrial pulverized coal boiler combustion - Google Patents
Automatic control method, device, equipment and medium for industrial pulverized coal boiler combustion Download PDFInfo
- Publication number
- CN110566928B CN110566928B CN201910870301.2A CN201910870301A CN110566928B CN 110566928 B CN110566928 B CN 110566928B CN 201910870301 A CN201910870301 A CN 201910870301A CN 110566928 B CN110566928 B CN 110566928B
- Authority
- CN
- China
- Prior art keywords
- boiler
- combustion
- coal
- air
- fluctuation range
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The embodiment of the invention discloses an automatic control method, device, equipment and medium for combustion of an industrial pulverized coal boiler. Wherein the method comprises the following steps: receiving a main steam flow value of the boiler detected by a field instrument; determining the current boiler instantaneous load fluctuation range according to the main steam flow value; and adjusting the control strategy of the boiler combustion system in time according to the current instantaneous load fluctuation range of the boiler, and controlling the air-coal ratio of the boiler so as to adjust the main steam pressure of the boiler. The system can realize real-time data exchange among systems, determines the air-coal ratio of boiler combustion according to boiler load, ensures stable combustion of the boiler, realizes full-automatic control of a boiler combustion system, improves the thermal efficiency of the boiler, and reduces operation cost and potential safety hazards.
Description
Technical Field
The embodiment of the invention relates to the field of automatic control, in particular to an automatic control method, device, equipment and medium for combustion of an industrial pulverized coal boiler.
Background
With increasingly strict requirements on energy utilization and environmental protection in China, the industrial pulverized coal boiler has the characteristics of high efficiency, energy conservation, environmental protection, emission, quick start and stop, simple operation, sealing and cleanness and low operation cost, conforms to the urgent situation of energy conservation and emission reduction and policy guidance of China, and is widely popularized and applied in more than ten provinces and markets in China.
The condition of serious load fluctuation of a heat supply center becomes the production normal state of the heat supply center, the requirement of automatic control of a boiler combustion control system cannot be met only by a PID (proportional integral derivative) control method, the boiler combustion control mode is controlled by a fuzzy algorithm in an auxiliary mode, the mode is limited by factors of coal quality change, and accurate combustion parameter Proportion cannot be given, so that the control mode of the current domestic industrial pulverized coal boiler for the boiler combustion system is basically in a remote manual operation mode. As the personnel operating the industrial pulverized coal boiler generally have the problems of weak technical capability and rough management, the thermal efficiency of the industrial pulverized coal boiler is reduced, the production and operation cost is increased, and the production safety accident is caused seriously.
Disclosure of Invention
The embodiment of the invention provides an automatic control method, device, equipment and medium for combustion of an industrial pulverized coal boiler, so as to realize automatic control of combustion of the industrial pulverized coal boiler, improve the heat efficiency, reduce the production and operation cost and reduce the occurrence of safety accidents.
In a first aspect, an embodiment of the present invention provides an automatic control method for combustion of an industrial pulverized coal boiler, including:
receiving a main steam flow value of the boiler detected by a field instrument;
determining the current boiler instantaneous load fluctuation range according to the main steam flow value;
and adjusting a control strategy of a boiler combustion system according to the current boiler instantaneous load fluctuation range, and controlling the air-coal ratio of the boiler so as to adjust the main steam pressure of the boiler.
Optionally, the controlling the air-coal ratio of the boiler according to the current instantaneous load fluctuation range of the boiler includes:
starting a combustion expert correction system by judging that the current boiler instantaneous load fluctuation range is greater than or equal to a boiler instantaneous load fluctuation range threshold value, and determining the current air-coal ratio parameter according to the combustion expert correction system;
determining the actual air-coal ratio of the boiler according to the current air-coal ratio parameter;
determining a target air-coal ratio of the boiler according to a mapping relation between a candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and a candidate parameter of the combustion equipment frequency converter;
and adjusting the air-coal ratio of the boiler according to the target air-coal ratio and the actual air-coal ratio.
Optionally, determining the actual air-coal ratio of the boiler according to the current air-coal ratio parameter includes:
determining the actual coal feeding amount of the boiler through the effective heat consumption of the boiler, the heat efficiency of the boiler and the low-level calorific power of fuel;
determining theoretical air quantity according to the coal quality parameters determined by the combustion expert correction system;
determining an actual air quantity according to the theoretical air quantity and the excess air coefficient;
determining an actual air-coal ratio parameter of the boiler according to the actual coal feeding amount and the actual air amount of the boiler;
wherein the coal quality parameters include at least one of: a base carbon content, a base sulfur content, a base hydrogen content, and an oxygen content.
Optionally, the determining a target air-coal ratio of the boiler according to a mapping relationship between a candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and a candidate parameter of the combustion device frequency converter includes:
and if the current boiler instantaneous load fluctuation range is larger than the boiler instantaneous load threshold value, determining the target boiler air-coal ratio according to the actual boiler air-coal ratio and the mapping relation between the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and the candidate parameters of the combustion equipment frequency converter.
Optionally, determining a mapping relationship between the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and the candidate parameter of the combustion equipment frequency converter by the following method:
before the current boiler instantaneous load fluctuation range is in a candidate load value, calibrating the combustion equipment frequency converter to obtain candidate parameters of the combustion equipment frequency converter;
and the candidate load value is obtained by taking 5% as a step length and increasing the initial candidate load value to the termination candidate load value.
In a second aspect, an embodiment of the present invention further provides an automatic combustion control device for an industrial pulverized coal boiler, including:
the main steam flow value receiving module is used for receiving a main steam flow value of the boiler detected by the field instrument;
the instantaneous load fluctuation range determining module is used for determining the instantaneous load fluctuation range of the current boiler according to the main steam flow value;
and the main steam pressure adjusting module is used for adjusting a control strategy of a boiler combustion system according to the current instantaneous load fluctuation range of the boiler and controlling the air-coal ratio of the boiler so as to adjust the main steam pressure of the boiler.
Optionally, the main steam pressure adjusting module includes:
the current air-coal ratio parameter determining submodule is used for starting the combustion expert correction system by judging that the current boiler instantaneous load fluctuation range is greater than or equal to the boiler instantaneous load fluctuation range threshold value, and determining the current air-coal ratio parameter according to the combustion expert correction system;
the actual air-coal ratio determining submodule is used for determining the actual air-coal ratio of the boiler according to the current air-coal ratio parameter;
and the target air-coal ratio determining submodule is used for determining the target air-coal ratio of the boiler according to the mapping relation between the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and the candidate parameters of the combustion equipment frequency converter.
Optionally, the actual wind-coal ratio determining submodule is specifically configured to:
determining the actual coal feeding amount of the boiler through the effective heat consumption of the boiler, the heat efficiency of the boiler and the low-level calorific power of fuel;
determining theoretical air quantity according to the coal quality parameters determined by the combustion expert correction system;
determining an actual air quantity according to the theoretical air quantity and the excess air coefficient;
determining an actual air-coal ratio parameter of the boiler according to the actual coal feeding amount and the actual air amount of the boiler;
wherein the coal quality parameters include at least one of: a base carbon content, a base sulfur content, a base hydrogen content, and an oxygen content.
In a third aspect, an embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, the processor implements the method for automatically controlling combustion of an industrial pulverized coal boiler according to any embodiment of the present invention.
In a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method for automatic control of combustion of an industrial pulverized coal boiler according to any embodiment of the present invention.
The embodiment of the invention provides an automatic control method, a device, equipment and a medium for combustion of an industrial pulverized coal boiler, which are used for determining the instantaneous load of the boiler by transmitting the main steam flow value of the boiler in real time, automatically adjusting the air-coal ratio of the boiler, ensuring the stable operation of the boiler, automatically controlling the combustion of the boiler in different load states, realizing the real-time exchange of data among systems, improving the thermal efficiency of the boiler, reducing the operation cost and reducing the occurrence of safety accidents.
Drawings
FIG. 1 is a schematic flow chart of an automatic control method for combustion of an industrial pulverized coal boiler according to a first embodiment of the present invention;
FIG. 2 is a schematic flow chart of an automatic control method for combustion of an industrial pulverized coal boiler according to a second embodiment of the present invention;
FIG. 3 is a flow chart of an automatic control method for combustion of an industrial pulverized coal boiler according to a third embodiment of the present invention;
fig. 4 is a block diagram showing the structure of an automatic combustion control device for an industrial pulverized coal boiler according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a computer device according to a fifth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic flow chart of an automatic control method for combustion of an industrial pulverized coal boiler according to an embodiment of the present invention, where the embodiment is applicable to a situation where an instantaneous load changes during combustion of a boiler, and the method can be executed by an automatic control device for combustion of an industrial pulverized coal boiler. As shown in fig. 1, the automatic control method for combustion of an industrial pulverized coal boiler specifically comprises the following steps:
Wherein, boiler master Control DCS System (Distributed Control System ) passes through the cable and is connected with the site instrument among the site instrument detecting System, and the site instrument transmits the main steam flow that detects to boiler master Control DCS System in real time, and the site instrument can include: vortex shedding flowmeter, uniform velocity tube flowmeter, orifice plate flowmeter, differential pressure flowmeter and throttling flowmeter.
And step 120, determining the current boiler instantaneous load fluctuation range according to the main steam flow value.
And step 130, adjusting a control strategy of a boiler combustion system according to the current instantaneous load fluctuation range of the boiler, and controlling the air-coal ratio of the boiler so as to adjust the main steam pressure of the boiler.
Wherein, the air-coal ratio of the boiler refers to the ratio of the coal feeding amount and the air amount of the boiler. Specifically, the current air-coal ratio parameter is determined according to the current boiler instantaneous load, and then the actual air-coal ratio of the boiler is adjusted according to the current air-coal ratio parameter.
Illustratively, the combustion apparatus frequency converter includes: primary air fan, secondary air fan, batcher and draught fan. The combustion equipment frequency converter is connected with the boiler main control DCS system through a Profibus DP bus (Profibus Decentralized peripheral, distributed peripheral field bus), and the calibration value is stored in the boiler main control DCS system.
Optionally, step 130 includes: starting a combustion expert correction system by judging that the current boiler instantaneous load fluctuation range is greater than or equal to a boiler instantaneous load fluctuation range threshold value, and determining the current air-coal ratio parameter according to the combustion expert correction system;
determining the actual air-coal ratio of the boiler according to the current air-coal ratio parameters;
determining a target air-coal ratio of the boiler according to a mapping relation between a candidate boiler instantaneous load fluctuation range stored in a combustion expert correction system and a candidate parameter of a combustion equipment frequency converter;
and adjusting the air-coal ratio of the boiler according to the target air-coal ratio and the actual air-coal ratio.
For example, the current parameters include coal quality parameters, effective heat consumption of the boiler, thermal efficiency of the boiler and a low calorific value of fuel, an online coal quality analysis system in the combustion expert correction system monitors the coal quality parameters of the boiler under the current instantaneous load in real time, and the actual air-coal ratio of the boiler is determined by calculating the ratio of the actual air supply quantity to the coal supply quantity according to the current parameters. The on-line coal quality analysis system is used for sending actual values of corresponding coal quality parameters to the combustion expert correction system when the coal quality of the fuel of the industrial pulverized coal boiler changes, so that the air-coal proportioning parameters are corrected in real time when the coal quality changes. Setting the boiler instantaneous load threshold value as 40%, taking 5% increasing of boiler load as a condition, respectively calibrating the wind-coal ratio parameter of the combustion equipment frequency converter as a candidate boiler instantaneous load fluctuation range when the boiler load is 40%, 45%, 50% and up to 100%, storing the calibrated value in a database of a boiler main Control DCS (distributed Control System) before an industrial pulverized coal boiler combustion automatic Control system is put into use, and transmitting the calibrated value to a combustion expert correction system through an OPC (Object Linking and Embedding for Process Control) protocol so as to enable the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system to be in one-to-one correspondence with the candidate parameters of the combustion equipment frequency converter.
Optionally, if the instantaneous load fluctuation range of the current boiler is greater than the instantaneous load fluctuation range threshold of the boiler, determining a target air-coal ratio of the boiler according to the instantaneous load fluctuation range of the current boiler and a mapping relation between candidate parameters of a candidate boiler instantaneous load fluctuation range and a combustion equipment frequency converter stored in a combustion expert correction system, and finally determining a set value of a final air-coal ratio under the current load according to the actual air-coal ratio and the target air-coal ratio through a neural network deep learning function.
In addition, when the instantaneous load fluctuation range of the boiler is smaller than the threshold value of the instantaneous load fluctuation range of the boiler, the boiler main control DCS system utilizes an automatic control program of a boiler combustion system in the boiler main control DCS system to realize the automatic operation of the boiler combustion system through the real-time detection of a field instrument.
Illustratively, the instantaneous load threshold of the boiler is 40%, and in the case that the fluctuation range of the instantaneous load is less than 40%, the main boiler control DCS system is implemented by three subsystems: the system comprises an air supply subsystem, a fuel regulation subsystem and an induced air regulation subsystem.
The air supply subsystem is composed of a flue gas oxygen content correction loop, an air supply quantity adjusting loop and an air supply quantity measuring loop, the boiler main steam pressure is used as a main signal to control, and the air supply quantity adjusting loop and the fuel adjusting subsystem are matched to complete air-coal proportioning. The air supply quantity measuring circuit determines a total air quantity signal, and an air supply regulator in the air supply quantity regulating circuit regulates parameters of a combustion equipment frequency converter according to the deviation of the main steam pressure instruction and the total air quantity signal, wherein the combustion equipment frequency converter can specifically comprise an air supply machine frequency converter and a powder feeder frequency converter. An oxygen regulator in the flue gas oxygen content correction loop ensures that the flue gas oxygen content is equal to a given value, and a large-value selector in the air supply subsystem is matched with a small-value selector in the fuel regulation subsystem so as to ensure that air is added firstly when the load is added and coal is reduced firstly when the load is reduced.
The fuel regulator in the fuel regulating subsystem regulates the rotation speed of the frequency converter of the powder feeder according to the deviation signal between the instantaneous load command of the boiler and the total coal amount in the frequency converter of the powder feeder, corrects the heat value change of the coal, and the fuel regulating subsystem obtains the fuel regulating set value by selecting the small value from the small value selector, thereby ensuring that the fuel amount is less than the air supply amount in the dynamic process.
The draught regulator in the draught regulating system is regulated by taking the negative pressure at the outlet of the boiler as a main signal, and simultaneously, the air supply quantity is introduced as a feed-forward signal to ensure that the negative pressure is in a proper range when the air supply quantity of the boiler changes.
When the instantaneous load fluctuation range of the boiler is larger than or equal to the instantaneous load fluctuation range threshold value of the boiler, the boiler main control DCS automatically sends an instruction request to the combustion expert correction system, the combustion expert correction system sends the corrected wind-coal ratio parameters back to the boiler main control DCS, the frequency converter of the combustion equipment is calibrated again, and the full-automatic adjusting function of the boiler combustion system is completed quickly and accurately.
According to the embodiment, the main steam flow of the boiler is obtained in real time, the instantaneous load fluctuation range of the boiler is obtained, and the current air-coal ratio of the boiler is determined, so that the main steam pressure of the boiler is automatically adjusted, the problem that the automatic control requirement of boiler combustion cannot be met by a traditional PID control method is solved, the influence of coal quality change on boiler combustion is avoided, the control strategy of a boiler combustion system is adjusted in time, accurate air-coal ratio is given, the full-automatic operation of the combustion system of the boiler under any load is guaranteed, the heat efficiency of the boiler is improved, the operation cost is reduced, and potential safety hazards are reduced.
Example two
Fig. 2 is a schematic flow chart of an automatic control method for combustion of an industrial pulverized coal boiler according to a second embodiment of the present invention. As shown in fig. 2, the method specifically includes the following steps:
And step 220, determining the current boiler instantaneous load fluctuation range according to the main steam flow value.
And step 230, starting a combustion expert correction system by judging that the current boiler instantaneous load fluctuation range is greater than or equal to the boiler instantaneous load fluctuation range threshold value, and determining the current air-coal ratio parameters.
Wherein, the current wind-coal ratio parameters may include at least one of: the coal quality parameters, the effective heat consumption of the boiler, the thermal efficiency of the boiler and the fuel receiving base low-level heating value are monitored in real time by an on-line coal quality analysis system in the combustion expert correction system. Optionally, the coal quality parameter includes at least one of the following: a base carbon content, a base sulfur content, a base hydrogen content, and an oxygen content.
And 240, determining the actual coal feeding amount of the boiler according to the effective heat consumption of the boiler, the thermal efficiency of the boiler and the fuel receiving base low-level heating value.
In this embodiment, the actual coal feeding amount may be determined by the following formula:
wherein beta is the actual coal supply of the boiler, QYXIs effective heat of the boiler, delta is boiler heat efficiency, QrA base lower heating value is received for the fuel.
And step 250, determining theoretical air quantity according to the coal quality parameters determined by the combustion expert correction system.
The theoretical air quantity can be determined by the following formula:
V0＝0.0889(Car+0.375Sar)+0.265Har-0.0333Oar
wherein, V0Theoretical amount of air, CarIs the amount of base carbon received by the fuel, SarIs the amount of sulfur radical received by the fuel, HarIs the amount of radical hydrogen received by the fuel, OarThe oxygen content received by the fuel.
In step 260, an actual air amount is determined based on the theoretical air amount and the excess air ratio.
The actual air quantity can be determined by the following formula: v is alpha V0
Wherein V is the actual air quantity, alpha is the given value of the excess air coefficient, and is determined by the furnace type.
And 270, determining the actual air-coal ratio of the boiler according to the actual coal feeding amount and the actual air amount of the boiler.
Wherein, the actual air-coal ratio of the boiler is the ratio of the actual coal feeding amount to the actual air amount. This embodiment obtains boiler instantaneous load through acquireing boiler main steam flow in real time, through obtaining boiler current parameter, in time adjusts boiler combustion system control strategy, confirms the actual wind coal ratio of boiler, avoids the influence of coal quality change to boiler burning, realizes the full-automatic safe operation of boiler, reduces the human consumption.
EXAMPLE III
Fig. 3 is a schematic flow chart of an automatic control method for combustion of an industrial pulverized coal boiler according to a third embodiment of the present invention, which is based on the third embodiment and is suitable for a situation where an instantaneous load fluctuation range of a boiler is greater than or equal to a threshold of the instantaneous load fluctuation range of the boiler during boiler combustion. As shown in fig. 3, the method specifically includes the following steps:
and 310, storing a calibration value in a boiler main control DCS (distributed control system) according to the calibration of the frequency converter of the combustion equipment on the air-coal ratio under different loads, and communicating the calibration value to a combustion expert correction system through an OPC (optical proximity correction) protocol.
Before the industrial pulverized coal boiler combustion automatic control system is put into use, firstly, the wind coal ratio of the boiler under different candidate loads is calibrated in a combustion equipment frequency converter, so that the instant load fluctuation range of the candidate boiler stored in a combustion expert correction system corresponds to the candidate parameters of the combustion equipment frequency converter one by one, the ratio parameters of each load are stored in a boiler main control DCS system, the mixture parameters are communicated to the combustion expert correction system through an OPC protocol, the mapping relation between the instant load fluctuation range of the candidate boiler stored in the combustion expert correction system and the candidate parameters of the combustion equipment frequency converter is determined, and the calibrated value is used as the wind coal ratio initialization parameter of the combustion expert correction system.
Illustratively, the candidate load values are incremented by 5% from the initial candidate load value of 40% to the final candidate load value of 100%.
And step 320, acquiring a main steam flow value detected by the field instrument.
And step 330, determining that the current boiler instantaneous load fluctuation range is larger than or equal to the boiler instantaneous load fluctuation range threshold value according to the main steam flow value.
And 340, calculating in real time according to the actual air-coal ratio under the current instantaneous load of the boiler.
The method comprises the steps of obtaining coal quality parameters by utilizing an online coal quality analysis system in a combustion expert correction system, and calculating the air-coal ratio under the current load of a boiler in real time to obtain related ratio parameters.
And 350, determining the target air-coal ratio of the boiler according to the mapping relation between the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and the candidate parameters of the combustion equipment frequency converter.
The method comprises the steps of obtaining a current wind coal ratio parameter and a wind coal ratio initialization parameter by utilizing an online coal quality analysis system in a combustion expert correction system, and finally determining a set value of a final wind coal ratio under a current load through a neural network deep learning function.
And step 360, adjusting the air-coal ratio of the boiler according to the target air-coal ratio and the actual air-coal ratio, sending a set value of the target air-coal ratio to a main control DCS (distributed control System) of the boiler to serve as a set value of a parameter of a frequency converter of the combustion equipment, and automatically correcting the air-coal ratio when the instantaneous load fluctuation range of the boiler exceeds a threshold value of the instantaneous load fluctuation range of the boiler.
When the combustion expert correction system receives a request that a load instantaneous range automatically sent by the boiler main control DCS system is larger than or equal to a boiler instantaneous load fluctuation range threshold value, the combustion expert correction system automatically sends a set value of a final air-coal ratio under the current actual load to the boiler main control DCS system, so that the automatic correction function of the air-coal ratio parameters under the working condition that the boiler load instantaneous fluctuation range is larger than or equal to the boiler instantaneous load fluctuation range threshold value is realized, and the full-automatic control requirement of the boiler combustion system is guaranteed.
In the embodiment, the main steam flow of the boiler is obtained in real time, the instantaneous load of the boiler is obtained, under the condition that the fluctuation range of the instantaneous load of the boiler is larger than or equal to the fluctuation range threshold value of the instantaneous load of the boiler, the main control DCS system of the boiler sends an instruction request to the combustion expert correction system, the combustion expert correction system transmits the corrected air-coal ratio to the main control DCS system of the boiler to serve as a parameter setting value of a frequency converter of combustion equipment, and therefore the boiler combustion system is guaranteed to rapidly and accurately complete the full-automatic regulation function of the boiler combustion system under the working condition that the fluctuation range of the instantaneous load of the boiler is larger than or equal to the fluctuation range threshold value of the instantaneous load of the.
Example four
Fig. 4 is a block diagram of an automatic combustion control device for an industrial pulverized coal boiler according to a fourth embodiment of the present invention, which is capable of executing an automatic combustion control method for an industrial pulverized coal boiler according to any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. As shown in fig. 4, the apparatus includes:
a main steam flow value receiving module 401, configured to receive a main steam flow value of the boiler detected by the field instrument;
an instantaneous load fluctuation determining module 402, configured to determine a current boiler instantaneous load fluctuation range according to the main steam flow value;
and the main steam pressure adjusting module 403 is configured to adjust a control strategy of a boiler combustion system according to the current transient load fluctuation range of the boiler, and control the air-coal ratio of the boiler to adjust the main steam pressure of the boiler.
Optionally, the main steam pressure adjusting module 403 includes: a current wind coal ratio parameter determining submodule 404, an actual wind coal ratio determining submodule 405 and a target wind coal ratio determining submodule 406.
And the current air-coal ratio parameter determining submodule 404 is used for starting a combustion expert correction system by judging that the current boiler instantaneous load fluctuation range is greater than or equal to the boiler instantaneous load fluctuation range threshold value, and determining the current air-coal ratio parameter according to the combustion expert correction system.
And the actual air-coal ratio determining submodule 405 is used for determining the actual air-coal ratio of the boiler according to the current air-coal ratio parameters.
Optionally, the actual wind-coal ratio determining submodule 405 is specifically configured to:
determining the actual coal feeding amount of the boiler through the effective heat consumption of the boiler, the heat efficiency of the boiler and the low-level calorific power of fuel;
determining theoretical air quantity according to the coal quality parameters determined by the combustion expert correction system;
determining an actual air amount according to the theoretical air amount and the excess air coefficient;
determining an actual air-coal ratio parameter of the boiler according to the actual coal feeding amount and the actual air amount of the boiler;
wherein the coal quality parameters comprise at least one of the following: a base carbon content, a base sulfur content, a base hydrogen content, and an oxygen content.
And the target air-coal ratio determining submodule 406 is used for determining the target air-coal ratio of the boiler according to the mapping relation between the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and the candidate parameters of the combustion equipment frequency converter.
The embodiment of the invention provides an automatic combustion control device for an industrial pulverized coal boiler, which is used for detecting the main steam flow value of the boiler in real time and automatically adjusting the main steam pressure of the boiler under the condition that the operation load fluctuation range of the industrial pulverized coal boiler is smaller than the instantaneous load fluctuation range threshold of the boiler and is larger than or equal to the instantaneous load fluctuation range threshold of the boiler, so that the problem that the traditional PID control device cannot meet the automatic combustion control requirement of the boiler is solved, the boiler combustion is prevented from being influenced by the coal quality change, the control strategy of a boiler combustion system is adjusted in time, accurate air-coal ratio is provided, the heat efficiency of the boiler is improved, the operation cost is reduced, and potential safety hazards are.
EXAMPLE five
Fig. 5 is a schematic structural diagram of a computer device according to a fifth embodiment of the present invention, and as shown in fig. 5, the computer device includes: memory 501, processor 502, input device 503, and output device 504.
The number of the processors 502 in the computer device may be one or more, and one processor 502 is taken as an example in fig. 5; the memory 501, the processor 502, the input device 503 and the output device 504 in the computer apparatus may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 5.
The memory 501 is used as a computer-readable storage medium and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the automatic control method for combustion of an industrial pulverized coal boiler in the embodiment of the present invention (for example, the main steam flow value receiving module 401, the instantaneous load fluctuation range determining module 402, the main steam pressure adjusting module 403, the current wind coal blending ratio parameter determining submodule 404, the actual wind coal blending ratio determining submodule 405, and the target wind coal blending ratio determining submodule 406 in the automatic control device for combustion of an industrial pulverized coal boiler). The processor 502 executes various functional applications and data processing of the computer device by running the software programs, instructions and modules stored in the memory 501, so as to implement the automatic control method for combustion of the industrial pulverized coal boiler according to any embodiment.
The memory 501 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 501 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 501 may further include memory located remotely from the processor 502, which may be connected to a computer device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 503 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the computer apparatus. The output device 504 may include a display device such as a display screen.
EXAMPLE six
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for automatically controlling combustion of an industrial pulverized coal boiler, the method including:
receiving a main steam flow value of the boiler detected by a field instrument;
determining the current boiler instantaneous load fluctuation range according to the main steam flow value;
and adjusting a control strategy of a boiler combustion system according to the current boiler instantaneous load fluctuation range, and controlling the air-coal ratio of the boiler so as to adjust the main steam pressure of the boiler.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the industrial pulverized coal boiler combustion automatic control method provided by any embodiments of the present invention.
From the above description of the embodiments, it is obvious for a person skilled in the art that the present invention can be implemented by software and necessary general hardware, and the technical solution of the present invention or a part contributing to the prior art can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for making a device execute the method described in the embodiments of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. An automatic control method for industrial pulverized coal boiler combustion is characterized by comprising the following steps:
receiving a main steam flow value of the boiler detected by a field instrument;
determining the current boiler instantaneous load fluctuation range according to the main steam flow value;
adjusting a control strategy of a boiler combustion system according to the current boiler instantaneous load fluctuation range, and controlling the air-coal ratio of the boiler so as to adjust the main steam pressure of the boiler;
the method for controlling the air-coal ratio of the boiler according to the current instantaneous load fluctuation range of the boiler comprises the following steps:
starting a combustion expert correction system by judging that the current boiler instantaneous load fluctuation range is greater than or equal to a boiler instantaneous load fluctuation range threshold value, and determining the current air-coal ratio parameter according to the combustion expert correction system;
determining the actual air-coal ratio of the boiler according to the current air-coal ratio parameter;
determining a target air-coal ratio of the boiler according to a mapping relation between a candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and a candidate parameter of a combustion equipment frequency converter;
and adjusting the air-coal ratio of the boiler according to the target air-coal ratio and the actual air-coal ratio.
2. The method of claim 1, wherein determining an actual wind-coal ratio of a boiler based on the current wind-coal ratio parameter comprises:
determining the actual coal feeding amount of the boiler through the effective heat consumption of the boiler, the heat efficiency of the boiler and the low-level calorific power of fuel;
determining theoretical air quantity according to the coal quality parameters determined by the combustion expert correction system;
determining an actual air quantity according to the theoretical air quantity and the excess air coefficient;
determining the actual air-coal ratio of the boiler according to the actual coal feeding amount and the actual air amount of the boiler;
wherein the coal quality parameters include at least one of: a base carbon content, a base sulfur content, a base hydrogen content, and an oxygen content.
3. The method of claim 1, wherein the determining the target air-coal ratio of the boiler according to the mapping relation between the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and the candidate parameters of the combustion equipment frequency converter comprises:
and if the current boiler instantaneous load fluctuation range is larger than the boiler instantaneous load fluctuation range threshold value, determining the target air-coal ratio of the boiler according to the actual air-coal ratio of the boiler and the mapping relation between the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and the candidate parameters of the combustion equipment frequency converter.
4. The method of claim 1, wherein the mapping between the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and the candidate parameters of the combustion plant frequency converter is determined by:
calibrating the frequency converter of the combustion equipment before the current boiler instantaneous load fluctuation range is in the candidate boiler instantaneous load fluctuation range to obtain candidate parameters of the frequency converter of the combustion equipment;
and the candidate boiler instantaneous load fluctuation range is obtained by gradually increasing the initial candidate boiler instantaneous load fluctuation range to the termination candidate boiler instantaneous load fluctuation range by taking 5% as a step length.
5. An industrial pulverized coal boiler combustion automatic control device is characterized by comprising:
the main steam flow value receiving module is used for receiving a main steam flow value of the boiler detected by the field instrument;
the instantaneous load fluctuation range determining module is used for determining the instantaneous load fluctuation range of the current boiler according to the main steam flow value;
the main steam pressure adjusting module is used for adjusting a control strategy of a boiler combustion system according to the current instantaneous load fluctuation range of the boiler and controlling the air-coal ratio of the boiler so as to adjust the main steam pressure of the boiler;
the main steam pressure adjusting module includes:
the current air-coal ratio parameter determining submodule is used for starting the combustion expert correction system by judging that the current boiler instantaneous load fluctuation range is greater than or equal to the boiler instantaneous load fluctuation range threshold value, and determining the current air-coal ratio parameter according to the combustion expert correction system;
the actual air-coal ratio determining submodule is used for determining the actual air-coal ratio of the boiler according to the current air-coal ratio parameter;
and the target air-coal ratio determining submodule is used for determining the target air-coal ratio of the boiler according to the mapping relation between the candidate boiler instantaneous load fluctuation range stored in the combustion expert correction system and the candidate parameters of the combustion equipment frequency converter.
6. The device of claim 5, wherein the actual wind-coal ratio determination submodule is specifically configured to:
determining the actual coal feeding amount of the boiler through the effective heat consumption of the boiler, the heat efficiency of the boiler and the low-level calorific power of fuel;
determining theoretical air quantity according to the coal quality parameters determined by the combustion expert correction system;
determining an actual air quantity according to the theoretical air quantity and the excess air coefficient;
determining the actual air-coal ratio of the boiler according to the actual coal feeding amount and the actual air amount of the boiler;
wherein the coal quality parameters include at least one of: a base carbon content, a base sulfur content, a base hydrogen content, and an oxygen content.
7. A computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, implements a method for automatic control of combustion of an industrial pulverized coal boiler as claimed in any one of claims 1 to 4.
8. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out a method for automatic control of combustion of an industrial pulverized coal boiler as claimed in any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870301.2A CN110566928B (en) | 2019-09-16 | 2019-09-16 | Automatic control method, device, equipment and medium for industrial pulverized coal boiler combustion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870301.2A CN110566928B (en) | 2019-09-16 | 2019-09-16 | Automatic control method, device, equipment and medium for industrial pulverized coal boiler combustion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110566928A CN110566928A (en) | 2019-12-13 |
| CN110566928B true CN110566928B (en) | 2021-06-15 |
Family
ID=68780294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910870301.2A Active CN110566928B (en) | 2019-09-16 | 2019-09-16 | Automatic control method, device, equipment and medium for industrial pulverized coal boiler combustion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110566928B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202032573U (en) * | 2011-04-01 | 2011-11-09 | 北京三博中自科技有限公司 | Combustion optimization control system of circulating fluidized bed boiler under load variation in large range |
| CN102620774A (en) * | 2012-02-29 | 2012-08-01 | 华北电力大学（保定） | Method for calibrating secondary air volume of coal-fired boiler on line |
| CN103697946A (en) * | 2013-12-05 | 2014-04-02 | 贵州电网公司电力调度控制中心 | Method for calculating flue gas flow of coal-fired boiler in heat-engine plant and method for controlling pollutant discharge amount |
| CN105240868A (en) * | 2015-11-05 | 2016-01-13 | 哈尔滨汇通电力工程有限公司 | Boiler automatic combustion adjustment control method based on coal-air ratio coal quality correction |
| CN205535933U (en) * | 2016-03-15 | 2016-08-31 | 广东工业大学 | High temperature air adds high temperature hypoxemia flue gas and mixes full automatic control ceramic kiln of combustion -supporting formula |
| CN107543199A (en) * | 2016-06-23 | 2018-01-05 | 天津市志捷科技有限公司 | A kind of pulverized-coal fired boiler online detection of primary air and burning optimization management system |
| CN108679592A (en) * | 2018-05-25 | 2018-10-19 | 北京德普新源科技发展有限公司 | A kind of the boiler load control system and control method of biomass boiler |
-
2019
- 2019-09-16 CN CN201910870301.2A patent/CN110566928B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202032573U (en) * | 2011-04-01 | 2011-11-09 | 北京三博中自科技有限公司 | Combustion optimization control system of circulating fluidized bed boiler under load variation in large range |
| CN102620774A (en) * | 2012-02-29 | 2012-08-01 | 华北电力大学（保定） | Method for calibrating secondary air volume of coal-fired boiler on line |
| CN103697946A (en) * | 2013-12-05 | 2014-04-02 | 贵州电网公司电力调度控制中心 | Method for calculating flue gas flow of coal-fired boiler in heat-engine plant and method for controlling pollutant discharge amount |
| CN105240868A (en) * | 2015-11-05 | 2016-01-13 | 哈尔滨汇通电力工程有限公司 | Boiler automatic combustion adjustment control method based on coal-air ratio coal quality correction |
| CN205535933U (en) * | 2016-03-15 | 2016-08-31 | 广东工业大学 | High temperature air adds high temperature hypoxemia flue gas and mixes full automatic control ceramic kiln of combustion -supporting formula |
| CN107543199A (en) * | 2016-06-23 | 2018-01-05 | 天津市志捷科技有限公司 | A kind of pulverized-coal fired boiler online detection of primary air and burning optimization management system |
| CN108679592A (en) * | 2018-05-25 | 2018-10-19 | 北京德普新源科技发展有限公司 | A kind of the boiler load control system and control method of biomass boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110566928A (en) | 2019-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109973300B (en) | Power control method and device for wind generating set | |
| CN103322547A (en) | Boiler control and combustion optimization method | |
| CN102654751A (en) | Coordination control method based on nonlinear control and fuzzy control | |
| CN110260356B (en) | Energy-saving control method of fluidized bed boiler | |
| CN103343961A (en) | Dynamic compensation method of attemperation water impact leading steam temperature measuring point in boiler steam temperature control system | |
| CN109062149A (en) | A kind of coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value | |
| CN109378833A (en) | A method of unit fast frequency hopping is realized by control extraction flow of steam | |
| CN103712235A (en) | Primary air fan controlling method and device | |
| CN111692611A (en) | Automatic control system and method for air supply of power plant boiler | |
| CN110889638B (en) | Thermal power plant operation evaluation method and related equipment | |
| CN113464920B (en) | Method and system for coordinated control of main pipe steam pressure | |
| CN110566928B (en) | Automatic control method, device, equipment and medium for industrial pulverized coal boiler combustion | |
| CN116382200A (en) | Full-load self-stabilization system of unit and operation method thereof | |
| CN115751276A (en) | Control system of gas boiler | |
| RU2361092C1 (en) | System of automatic control of steam-gas plant capacity with action at control elements of gas turbine set and steam turbine | |
| CN108361731B (en) | Hot-water boiler air and flue system automation control method | |
| JPS6133362Y2 (en) | ||
| CN113485499A (en) | Coal feeding regulation and control method for coal quality working condition change | |
| CN106406080A (en) | AGC function remote optimization system and method of thermal power generator set | |
| CN111998383A (en) | Over-fire air control method based on boiler load and flame central point coordinate quantization | |
| CN115681943A (en) | Automatic combustion control system for three kinds of coal gas power generation boiler | |
| CN114673982B (en) | Main steam temperature control system of thermal power generation boiler based on hybrid intelligent optimization algorithm | |
| CN111472852B (en) | Intermediate point enthalpy value frequency modulation based logical optimization method for generator set | |
| CN112799447B (en) | Control method of high-pressure heater | |
| CN113836729A (en) | Method for reducing content of combustible materials in fly ash of boiler of thermal power plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |