Automatic control system, method and storage medium for air-powder balanced combustion of boiler

Abstract

The present invention provides an automatic control system, method and storage medium for air-powder balanced combustion of a boiler, comprising: an upper furnace cross-section temperature field measurement module, a combustion chamber near-wall CO measurement module, a distributed control module, a data communication module, an automatic control strategy operation module and a bias instruction superposition module. Through the five modules of the upper furnace cross-section temperature field measurement module, the combustion chamber near-wall CO measurement module, the distributed control module, the data communication module, the automatic control strategy operation module and the bias instruction superposition module, the automatic control of the air-powder balanced combustion of the boiler can ultimately be achieved, thereby saving labor costs and avoiding the problem of uneven air-powder combustion of the boiler under traditional conventional automatic control conditions leading to furnace heat load deviation.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler automatic control, and in particular to an automatic control system, method and storage medium for air-powder balanced combustion of a boiler. Background Art

[0002] W-flame boilers are specifically designed for low-volatile anthracite and lean coal. They offer strong adaptability and significantly improve the ignition and low-load combustion performance of low-volatile coals. Compared with traditional tangentially fired and opposed-fired boilers, W-flame boilers, given the same evaporation rate, are more susceptible to uneven furnace heat load distribution due to their wider furnace width and the predominantly vertical tube panel layout of the lower water-cooled wall. This can lead to problems such as water-wall temperature deviation, drum water level deviation, and steam temperature deviation.

[0003] Because W-flame boilers have a large number of burners arranged across their width and need to be switched on and off when operating conditions change, the coordination of primary air and pulverized gas, secondary air and pulverized gas, and burnout air and pulverized gas is difficult to control. Conventional automatic control systems struggle to maintain balanced combustion, which can easily lead to high local heat loads or mainstream flue gas brushing against the upper furnace wall. Therefore, W-flame boiler operators typically use manual control methods to control air and pulverized gas. However, manual control methods suffer from lag and accuracy issues, and are unable to resolve the range of combustion issues that arise when W-flame boilers operate under variable operating conditions.

[0004] The main reason why conventional automatic control systems cannot achieve balanced air-powder combustion is the lack of key parameters such as the furnace temperature field and the reducing atmosphere near the wall. It is impossible to obtain the actual combustion conditions in the current furnace, and it is impossible to adjust the air-powder parameters in a targeted manner. It is difficult to adapt to changes in coal quality, load, etc. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides an automatic control system, method and storage medium for air-powder balanced combustion of boilers, which not only solves the problem of furnace heat load deviation caused by uneven air-powder combustion of boilers under traditional conventional automatic control conditions, but also can automatically control the air-powder balanced combustion of boilers, saving labor costs.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] The present invention provides an automatic control system for air-powder balanced combustion of a boiler, comprising:

[0008] Upper furnace cross-section temperature field measurement module: The upper furnace cross-section temperature field measurement module is used to measure the upper furnace cross-section temperature field data;

[0009] Combustion chamber near wall CO measurement module: The combustion chamber near wall CO measurement module is used to measure the CO concentration data near the combustion chamber wall;

[0010] Distributed control module: The distributed control module is used to measure the operating parameter data of the distributed control of the unit;

[0011] Data communication module: The data communication module is used to collect the upper furnace cross-section temperature field data, the CO concentration data near the combustion chamber wall and the distributed control operation parameter data in real time and transmit them to the automatic control strategy calculation module;

[0012] Automatic control strategy calculation module: The automatic control strategy calculation module is used to receive the upper furnace cross-section temperature field measurement data, the combustion chamber near wall CO measurement data and the unit distributed control operation parameter data, obtain the air-powder parameter adjustment strategy under the current combustion conditions through calculation and calculate the real-time adjustment target value of the air-powder parameter. The real-time adjustment target value of the air-powder parameter is transmitted back to the distributed control module through the data communication module;

[0013] Bias instruction superposition module: The bias instruction superposition module is used to adjust the target value in real time according to the air-powder parameters transmitted back to the distributed control module through communication. Through the logical configuration and screen configuration of the distributed control module, it is incorporated into the air-powder control loop in the form of a set value bias instruction to achieve real-time automatic control of the boiler's air-powder operating parameters.

[0014] The present invention provides an automatic control system, method and storage medium for air-powder balanced combustion of a boiler, which not only solves the problem of furnace heat load deviation caused by uneven air-powder combustion in the boiler under traditional conventional automatic control conditions, but also can automatically control the air-powder balanced combustion of the boiler, saving labor costs.

[0015] As a preferred technical solution, the data communication module is used for two-way data communication between the distributed control module and the automatic control strategy operation module.

[0016] As an optimal technical solution, the data communication module includes: an abnormal data judgment module, which is used to perform abnormal judgment on the real-time adjustment target value data of the wind and powder parameters transmitted back to each distributed control module, and judge that the normal real-time adjustment target value data of the wind and powder parameters is transmitted to the bias instruction superposition module.

[0017] As an optimal technical solution, the automatic control strategy operation module includes: an operation service module, which is used to obtain the coupling relationship between the air-powder operation parameter data and the upper furnace section temperature field data and the CO measurement data near the combustion chamber wall through the unit distributed control operation parameter data and calibration test, and calculate the real-time adjustment target value of the boiler's air-powder parameters with the boiler operation economic parameters and boiler operation safety parameters as the optimization control targets.

[0018] The present invention also provides an automatic control method for air-powder balanced combustion of a boiler, comprising the following steps:

[0019] Collect the measured upper furnace cross-section temperature field data, combustion chamber near-wall CO concentration data, and distributed control operating parameter data;

[0020] Based on the temperature field measurement data of the upper furnace section, the CO measurement data near the combustion chamber wall, and the operating parameter data of the unit distributed control, the air-powder parameter adjustment strategy under the current combustion conditions is obtained through calculation and the real-time adjustment target value of the air-powder parameter is calculated;

[0021] Adjust the target value data of each wind and powder parameter in real time to make abnormal judgment;

[0022] The normal air-powder parameters are judged to be adjusted in real time by target value data through logic configuration and screen configuration, and incorporated into the air-powder control loop in the form of set value offset instructions to achieve real-time automatic control of the air-powder operating parameters of the boiler.

[0023] As a preferred technical solution, measuring the temperature field data of the upper furnace section includes the following steps: using a non-contact temperature measurement method to measure the temperature field data of the upper furnace section in the upper furnace area of the boiler, and setting a non-contact temperature measuring element on the upper furnace, the non-contact temperature measuring element is used to measure the temperature distribution of the upper furnace section to obtain the temperature field data of the upper furnace section.

[0024] As an optimal technical solution, the CO concentration data near the combustion chamber wall is measured using a wheel measurement method.

[0025] As an optimal technical solution, the wheel measurement method is used to measure the CO concentration data near the wall of the combustion chamber, including the following steps: a plurality of measuring tube seats are arranged at the water-cooled wall of the boiler combustion chamber area by a tube-letting method, and the measuring tube seats are used to extract the flue gas near the wall. The measuring tube seats are provided with a control and measurement flue gas path component. The extracted flue gas is pre-treated and then connected to the CO concentration meter, and the CO concentration meter measures and obtains the CO concentration data near the wall of the combustion chamber.

[0026] As an optimal technical solution, obtaining the air-powder parameter adjustment strategy under the current combustion conditions through calculation and calculating the real-time adjustment target value of the air-powder parameter includes the following steps: obtaining the coupling relationship between the air-powder operating parameter data and the upper furnace section temperature field data and the CO measurement data near the combustion chamber wall through the operating parameter data of the unit distributed control and calibration tests, taking the boiler operation economic parameters and the boiler operation safety parameters as the optimization control targets, and calculating the real-time adjustment target value of the boiler's air-powder parameter.

[0027] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the automatic control method for air-powder balanced combustion of a boiler as described above.

[0028] The present invention provides an automatic control system, method and storage medium for air-powder balanced combustion of a boiler, which not only solves the problem of furnace heat load deviation caused by uneven air-powder combustion in the boiler under traditional conventional automatic control conditions, but also can automatically control the air-powder balanced combustion of the boiler, saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The upper furnace cross-section temperature and the CO measurement hole structure diagram near the combustion chamber wall provided by the present invention;

[0030] Figure 2 A two-dimensional temperature field structure diagram of the upper furnace cross section provided by the present invention;

[0031] Figure 3 This is a structural diagram of CO concentration near the combustion chamber wall provided by the present invention;

[0032] Figure 4 This is a partial flow chart of an automatic control system for air-powder balanced combustion of a boiler provided by the present invention;

[0033] Figure 5 This is a flow chart of an automatic control system for air-powder balanced combustion of a boiler provided by the present invention;

[0034] 1- Water-cooled wall in the boiler combustion chamber area; 2- CO concentration measurement tube socket; 3- Water-cooled wall in the boiler upper furnace area; 4- Temperature field measurement tube socket. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] It can be understood that the present invention is to achieve the purpose of the present invention through some embodiments, such as Figure 4-5 As shown, the present invention provides an automatic control system for air-powder balanced combustion of a boiler, comprising:

[0037] Upper furnace cross-section temperature field measurement module: The upper furnace cross-section temperature field measurement module is used to measure the upper furnace cross-section temperature field data;

[0038] Combustion chamber near wall CO measurement module: The combustion chamber near wall CO measurement module is used to measure the CO concentration data near the combustion chamber wall;

[0039] Distributed control module: The distributed control module is used to measure the operating parameter data of the distributed control of the unit;

[0040] Data communication module: The data communication module is used to collect real-time temperature field data of the upper furnace section, CO concentration data near the combustion chamber wall, and distributed control operating parameter data and transmit them to the automatic control strategy operation module; the data communication module is also used for two-way data communication between the distributed control module and the automatic control strategy operation module;

[0041] Automatic control strategy calculation module: The automatic control strategy calculation module is used to receive the upper furnace section temperature field measurement data, the combustion chamber near wall CO measurement data and the unit distributed control operation parameter data, obtain the air-powder parameter adjustment strategy under the current combustion condition through calculation and calculate the air-powder parameter real-time adjustment target value, and the air-powder parameter real-time adjustment target value is transmitted back to the distributed control module through the data communication module; the automatic control strategy calculation module includes: an operation service module, the operation service module is used to obtain the coupling relationship between the air-powder operation parameter data and the upper furnace section temperature field data and the combustion chamber near wall CO measurement data through the unit distributed control operation parameter data and calibration test, and calculate the boiler air-powder parameter real-time adjustment target value with the boiler operation economic parameters and boiler operation safety parameters as the optimization control targets;

[0042] The data communication module includes: an abnormal data judgment module, which is used to judge abnormalities in the real-time adjustment target value data of the wind and powder parameters transmitted back to each distributed control module, and transmit the normal real-time adjustment target value data of the wind and powder parameters to the bias instruction superposition module;

[0043] Bias instruction superposition module: The bias instruction superposition module is used to adjust the target value in real time based on the normal air-powder parameters judged by the communication back to the distributed control module. Through the logic configuration and screen configuration of the distributed control module, the module is incorporated into the air-powder control loop in the form of a set value bias instruction to achieve real-time automatic control of the air-powder operating parameters of the boiler;

[0044] Through the upper furnace cross-section temperature field measurement module, the combustion chamber near-wall CO measurement module, the distributed control module, the data communication module, the automatic control strategy operation module and the bias instruction superposition module, the above five modules can ultimately realize the automatic control of the boiler's air-powder balanced combustion, saving labor costs and avoiding the problem of furnace heat load deviation caused by uneven boiler air-powder combustion under traditional conventional automatic control conditions.

[0045] The present invention also provides an automatic control method for air-powder balanced combustion of a boiler, comprising the following steps:

[0046] The non-contact temperature measurement method is used to measure the temperature field data of the upper furnace section in the upper furnace area of the boiler;

[0047] The CO concentration data near the combustion chamber wall is measured by using the round measurement method to measure the CO concentration near the combustion chamber wall to obtain the CO measurement data near the combustion chamber wall;

[0048] Collect the measured upper furnace cross-section temperature field data, combustion chamber near-wall CO concentration data, and distributed control operating parameter data;

[0049] Based on the temperature field measurement data of the upper furnace section, the CO measurement data near the combustion chamber wall, and the operating parameter data of the unit distributed control, the air-powder parameter adjustment strategy under the current combustion conditions is obtained through calculation and the real-time adjustment target value of the air-powder parameter is calculated;

[0050] Obtaining the air-powder parameter adjustment strategy under the current combustion conditions and calculating the real-time adjustment target value of the air-powder parameter through calculation includes the following specific steps: obtaining the coupling relationship between the air-powder operating parameter data and the upper furnace cross-section temperature field data and the CO measurement data near the combustion chamber wall through the operating parameter data of the unit distributed control and calibration test, and calculating the real-time adjustment target value of the boiler air-powder parameter with the boiler operating economic parameters and boiler operating safety parameters as the optimization control targets;

[0051] Adjust the target value data of each wind and powder parameter in real time to make abnormal judgment;

[0052] The normal air-powder parameters are judged to be adjusted in real time by target value data through logic configuration and screen configuration, and incorporated into the air-powder control loop in the form of set value offset instructions to achieve real-time automatic control of the air-powder operating parameters of the boiler.

[0053] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the automatic control method for air-powder balanced combustion of a boiler as described in any one of the above items.

[0054] This will ultimately achieve automatic control of the boiler's air-powder balanced combustion, save labor costs, and avoid the problem of uneven boiler air-powder combustion leading to furnace heat load deviation under traditional conventional automatic control conditions.

[0055] like Figure 1 and Figure 3 As shown, the present invention provides a CO measurement structure near the combustion chamber wall, in which multiple measuring tube seats 2 are arranged at the water-cooled wall 1 in the boiler combustion chamber area by means of a pipe-passing method. The measuring tube seats 2 are used to extract the flue gas near the wall. The measuring tube seats are provided with a control and measurement flue gas path component. The extracted flue gas is pre-treated and then connected to the CO concentration meter. The CO concentration meter measures and obtains the CO concentration data near the combustion chamber wall.

[0056] like Figure 2 As shown, a non-contact temperature measurement method is used to measure the temperature field of the upper furnace section in the upper furnace area of the boiler. A non-contact temperature measuring element is set on the upper furnace, and the non-contact temperature measuring element is used to measure the temperature distribution of the upper furnace section to obtain the temperature field data of the upper furnace section.

[0057] like Figure 4-5 As shown, taking a W flame boiler as an example, the present invention provides an air-powder balanced combustion automatic control system for the boiler, comprising:

[0058] Upper furnace cross-section temperature field measurement module: used to measure the upper furnace cross-section temperature field in the upper furnace area of a W-flame boiler using a non-contact temperature measurement method. The non-contact temperature measurement method refers to an acoustic method or an optical method. Non-contact temperature measurement elements are arranged at a height of 30 meters or more in the upper furnace. The non-contact temperature measurement elements measure the temperature distribution of the upper furnace cross-section and obtain the upper furnace cross-section temperature field data.

[0059] Combustion chamber near-wall CO measurement module: used to measure and obtain the CO concentration distribution near the combustion chamber area to obtain CO data near the combustion chamber wall. Multiple measuring pipe sockets are arranged on the water-cooled wall of the combustion chamber area of the W-flame boiler by means of a pipe-passing method. The near-wall flue gas is extracted and connected to the CO measuring instrument after pre-treatment steps such as cooling, dehumidification, and dust removal. The CO concentration distribution near the combustion chamber wall is measured. The combustion chamber near-wall CO measurement module uses a round measurement method to measure the CO concentration, that is, a CO measuring instrument is arranged at the measuring hole position of the measuring pipe socket on the front wall, rear wall, left wall, and right wall of the combustion chamber. The flue gas measurement path in each area is controlled by a solenoid valve.

[0060] Distributed control module (DCS side): used to measure the operating parameter data of the distributed control of the unit;

[0061] Data communication module: This module is used to collect the operating parameter data (DCS operating data) of the distributed control of the unit, the upper furnace section temperature field data, and the CO concentration data near the combustion chamber wall in real time through an independent communication server, and transmit the real-time adjustment target value of the air-powder parameter obtained by the automatic control strategy operation module back to the distributed control module. The data communication system uses the Modbus RTU protocol to achieve two-way data communication between the distributed control module (DCS end) and the automatic control strategy operation module, and realizes one-way communication of the upper furnace section temperature field data and the CO concentration data near the combustion chamber wall through analog quantity acquisition. The data communication module is also used to judge the abnormality of each real-time adjustment target value of the air-powder parameter transmitted back to the distributed control module to prevent abnormal data from affecting the operation of the unit.

[0062] Automatic control strategy calculation module: used to receive the upper furnace section temperature field data, the combustion chamber near wall CO data and the unit distributed control operating parameter data synchronously obtained through the data communication module, and obtain the air-powder parameter adjustment strategy under the current combustion conditions through the calculation service module; the calculation service module obtains the coupling relationship between the air-powder operating parameters and the upper furnace section temperature field data and the combustion chamber near wall CO measurement data through the unit distributed control operating parameter data and calibration test, and calculates the real-time adjustment target value of the boiler's air-powder parameter with the boiler operation economy and boiler operation safety parameters as the optimization control target. The real-time adjustment target value of the boiler's air-powder parameter is transmitted back to the distributed control module through the data communication module; during this process, the data communication module is also used to judge the abnormality of each real-time adjustment target value of the air-powder parameter transmitted back to the distributed control module to prevent abnormal data from affecting the unit operation;

[0063] Bias instruction superposition module: used to judge the normal air-powder parameters in real time based on the communication feedback to the distributed control module. Through the logic configuration and screen configuration of the distributed control module, it is incorporated into the air-powder control loop in the form of set value bias instructions to achieve real-time automatic control of the boiler's air-powder operating parameters;

[0064] The operating parameter data of the unit's distributed control include: boiler oxygen content, boiler air volume, boiler coal volume, damper opening and other parameters;

[0065] The solenoid valve is preferably used as the control and measurement component for the flue gas path;

[0066] Through the upper furnace cross-section temperature field measurement module, the combustion chamber near-wall CO measurement module, the distributed control module, the data communication module, the automatic control strategy calculation module and the bias instruction superposition module, the above five modules can ultimately realize the automatic control of the boiler's air-powder balanced combustion, avoiding the problem of uneven boiler air-powder combustion causing furnace heat load deviation under traditional conventional automatic control conditions.

[0067] It will be appreciated that the present invention is described through some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are subject to various changes or equivalent substitutions. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope protected by the present invention.

Claims

1. An automatic control system for air-powder balanced combustion of a boiler, characterized in that: include: Upper furnace cross-section temperature field measurement module: used to measure the upper furnace cross-section temperature field data; Combustion chamber near wall CO measurement module: used to measure the CO concentration data near the combustion chamber wall; Distributed control module: used to measure the operating parameter data of the distributed control of the unit; Data communication module: used to collect the temperature field data of the upper furnace section, the CO concentration data near the combustion chamber wall and the operating parameter data of the distributed control in real time and transmit them to the automatic control strategy calculation module; Automatic control strategy calculation module: used to receive the upper furnace cross-section temperature field measurement data, the combustion chamber near wall CO measurement data and the unit distributed control operation parameter data, obtain the air-powder parameter adjustment strategy under the current combustion conditions through calculation and calculate the real-time adjustment target value of the air-powder parameter. The real-time adjustment target value of the air-powder parameter is transmitted back to the distributed control module through the data communication module; Bias instruction superposition module: The bias instruction superposition module is used to adjust the target value in real time according to the air-powder parameters transmitted back to the distributed control module via communication. Through the logic configuration and screen configuration of the distributed control module, the module is incorporated into the air-powder control loop in the form of a set value bias instruction to achieve real-time automatic control of the air-powder operating parameters of the boiler; The data communication module includes: an abnormal data judgment module, which is used to judge abnormalities of each wind and powder parameter real-time adjustment target value data transmitted back to the distributed control module, and transmit normal wind and powder parameter real-time adjustment target value data to the bias instruction superposition module; The automatic control strategy operation module includes: an operation service module, which is used to obtain the coupling relationship between the air-powder operation parameter data and the upper furnace section temperature field data and the CO measurement data near the combustion chamber wall through the unit distributed control operation parameter data and calibration test, and calculate the real-time adjustment target value of the boiler's air-powder parameter with the boiler operation economic parameters and boiler operation safety parameters as optimization control targets.

2. The air-powder balanced combustion automatic control system for a boiler according to claim 1, characterized in that: The data communication module is used for two-way data communication between the distributed control module and the automatic control strategy operation module.

3. A method for automatically controlling air-powder balanced combustion in a boiler, characterized in that: Running the air-powder balanced combustion automatic control system for a boiler according to any one of claims 1 to 2 comprises the following steps: Collect the measured upper furnace cross-section temperature field data, combustion chamber near-wall CO concentration data, and distributed control operating parameter data; Based on the temperature field measurement data of the upper furnace section, the CO measurement data near the combustion chamber wall, and the operating parameter data of the unit distributed control, the air-powder parameter adjustment strategy under the current combustion conditions is obtained through calculation and the real-time adjustment target value of the air-powder parameter is calculated; Adjust the target value data of each wind and powder parameter in real time to make abnormal judgment; The normal air-powder parameters are judged to be adjusted in real time by target value data through logic configuration and screen configuration, and incorporated into the air-powder control loop in the form of set value offset instructions to achieve real-time automatic control of the air-powder operating parameters of the boiler.

4. The automatic control method for air-powder balanced combustion of a boiler according to claim 3, characterized in that: Measuring the temperature field data of the upper furnace section includes the following steps: measuring the temperature field data of the upper furnace section in the upper furnace area of the boiler using a non-contact temperature measurement method, and setting a non-contact temperature measuring element on the upper furnace. The non-contact temperature measuring element is used to measure the temperature distribution of the upper furnace section to obtain the temperature field data of the upper furnace section.

5. The automatic control method for air-powder balanced combustion of a boiler according to claim 3, characterized in that: The CO concentration data near the combustion chamber wall was measured using a wheel measurement method.

6. The automatic control method for air-powder balanced combustion of a boiler according to claim 5, characterized in that: The wheel measurement method is used to measure the CO concentration data near the wall of the combustion chamber, which includes the following steps: a plurality of measuring tube seats are arranged at the water-cooled wall of the boiler combustion chamber area by a pipe-passing method, and the measuring tube seats are used to extract the flue gas near the wall. The measuring tube seats are provided with a control and measurement flue gas path component. The extracted flue gas is pre-treated and then connected to the CO concentration meter. The CO concentration meter measures and obtains the CO concentration data near the wall of the combustion chamber.

7. The automatic control method for air-powder balanced combustion of a boiler according to claim 5, characterized in that: The following steps are included in the process of obtaining the air-powder parameter adjustment strategy under the current combustion conditions and calculating the real-time adjustment target value of the air-powder parameter through calculation: obtaining the coupling relationship between the air-powder operating parameter data and the upper furnace section temperature field data and the CO measurement data near the combustion chamber wall through the operating parameter data of the unit distributed control and calibration tests, and calculating the real-time adjustment target value of the boiler's air-powder parameter with the boiler operating economic parameters and boiler operating safety parameters as the optimization control targets.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the automatic control method for air-powder balanced combustion for a boiler as described in any one of claims 3 to 7 is implemented.

Images