AGC coordinated control system for coal-fired boiler

Abstract

The invention relates to the technical field of new energy and efficient energy conservation, and discloses an AGC coordination control system for a coal-fired boiler, the system comprises a monitoring module, a calculation module, a simulation module, a safety protection module and an alarm module, the monitoring module comprises a boiler combustion control unit, a steam turbine control valve control unit and a coordination control unit, the calculation module comprises a combustion analysis unit, a steam turbine control valve analysis unit and a coordination analysis unit, the monitoring module is used for collecting data, the calculation module serves as a system calculation platform, and the system can monitor the combustion process in real time and rapidly adjust operation parameters to adapt to constantly-changing operation conditions so as to keep the optimal performance of a boiler; according to the AGC coordinated control system, multiple operation means are combined, so that the AGC coordinated control system meets the requirements of environmental protection and safety while improving the efficiency of the coal-fired boiler, and the problems of unstable combustion, coking and partial combustion overtemperature easily caused by an operation mode of artificial experience are solved through labor division and cooperation of an automatic mode among modules in the system.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy and high-efficiency energy-saving, and in particular to an AGC coordinated control system for a coal-fired boiler. Background Art

[0002] With the rapid economic growth, the demand for electricity is rising. As one of the main sources of electricity, coal-fired power generation has become a dual challenge that needs to be urgently addressed, such as improving efficiency and reducing pollutant emissions. These units are an important support for power supply, but they also bring significant environmental pressure. Harmful gases such as CO2, NOx and SO2 generated in the process of coal-fired power generation are closely related to environmental problems such as acid rain and greenhouse effect, which has aroused widespread concern in society.

[0003] Faced with increasingly stringent environmental regulations and the current market competition situation of separation of power plants and grids and competitive bidding for grid access, improving the operating efficiency of coal-fired generating units and reducing coal consumption have become the key to improving the market competitiveness of thermal power generation companies. However, the combustion process of coal-fired boilers has the characteristics of strong multivariable coupling, nonlinearity, time variation and large delay, making it difficult for traditional control methods to achieve precise regulation of the combustion state. At present, large-scale coal-fired boilers mostly rely on the experience of on-site operators in adjusting key parameters such as secondary air. This over-reliance on manual experience can easily lead to problems such as unstable combustion, coking, and overheating, thus affecting the safe and stable operation of the unit.

[0004] In order to meet these challenges, an AGC coordinated control system for coal-fired boilers came into being. This system aims to achieve precise control of the combustion process of coal-fired boilers through advanced control strategies and technical means, thereby improving power generation efficiency, reducing coal consumption, and effectively reducing pollutant emissions. By integrating modern control theory, intelligent optimization algorithms and data analysis technology, the AGC coordinated control system can achieve lower pollutant emissions while ensuring power generation efficiency, meeting the modern society's demand for efficient, environmentally friendly and intelligent power systems. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the present invention provides an AGC coordinated control system for a coal-fired boiler, which has the advantage of a stable combustion state and solves the problem that manual operation methods easily lead to unstable combustion, coking and over-temperature.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solutions: an AGC coordinated control system for a coal-fired boiler, the system comprising a monitoring module, a calculation module, a simulation module, a safety protection module and an alarm module;

[0009] The monitoring module includes a boiler combustion control unit, a steam turbine valve control unit and a coordination control unit;

[0010] The boiler combustion control unit obtains boiler combustion data through the boiler online monitoring device, numbers it, and connects it to the calculation module through the network. The steam turbine valve control unit obtains steam turbine valve control data through the steam turbine online monitoring device, numbers it, and connects it to the calculation module through the network. The coordination control unit obtains coordination control data through the network sensor, and the monitoring module and the calculation module share data through the network.

[0011] The calculation module includes a combustion analysis unit, a turbine valve adjustment analysis unit and a coordination analysis unit. The combustion analysis unit calculates the combustion index Rz according to the boiler combustion data, the turbine valve adjustment analysis unit calculates the turbine control index Lv according to the turbine valve adjustment control data, and the coordination analysis unit calculates the boiler and turbine coordination coefficient Yril according to the combustion index Rz, the turbine control index Lv and the coordination control data. The calculation module and the simulation module share data through the network;

[0012] The simulation module performs parameter simulation according to the turbine coordination coefficient Yril, and the simulation module shares data with the safety protection module through the network;

[0013] The safety protection module is used to handle emergency situations of the combustion control unit, the turbine valve control unit and the coordination control unit. The safety protection module transmits the emergency code to the alarm module via the network in the first time for fault diagnosis.

[0014] Preferably, the boiler combustion control unit numbers the boiler's supply air volume, complete combustion air volume, theoretical maximum heat, actual heat generated by combustion, carbon monoxide supply volume and actual carbon monoxide usage according to the boiler combustion data characteristics, and the boiler's supply air volume, complete combustion air volume, actual heat generated by combustion, theoretical maximum heat, carbon monoxide supply volume and actual carbon monoxide usage are numbered X, X1, Y, Y1, Z, Z1, respectively.

[0015] Preferably, the combustion analysis unit calculates the combustion index Rz according to the boiler combustion data, and the calculation formula is:

[0016]

[0017] In the formula, Rz represents the combustion index, X, X1, Y, Y1, Z, and Z1 represent the boiler's air supply, complete combustion air, actual combustion heat, theoretical maximum heat, carbon monoxide supply, and actual carbon monoxide usage, respectively. Indicates the boiler air combustion efficiency index, Indicates the boiler heat effectiveness index, It represents the boiler carbon monoxide combustion effectiveness index, a, b, c represent the weights of boiler air combustion effectiveness index, boiler heat effectiveness index and boiler carbon monoxide combustion effectiveness index in the combustion index respectively.

[0018] Preferably, the turbine valve control unit numbers the time when the valve receives the instruction, the time when the valve actually starts to act, and the steam flow data according to the characteristics of the turbine valve control data. The time when the valve receives the instruction and the time when the valve actually starts to act are numbered T and T1 respectively, and the steam flow data are numbered V1, V2, V3, ... V n .

[0019] Preferably, the turbine valve adjustment analysis unit calculates the turbine control index Lv according to the turbine valve adjustment control data, and the calculation formula is:

[0020]

[0021] In the formula, Lv represents the calculated turbine control index, T and T1 represent the time when the regulating valve receives the command and the time when the regulating valve actually starts to act, respectively. Indicates the response efficiency, V1, V2, V3, ... V n represents steam flow data, n represents the number of times the steam flow data is counted within a period of time, represents the average value of steam flow, Indicates the stability index of steam flow.

[0022] Preferably, the coordination control unit numbers the coordinated response speed between the boiler and the steam turbine and the theoretically calculated response speed under the same load demand according to the coordinated control data characteristics, and the coordinated response speed between the boiler and the steam turbine and the theoretically calculated response speed are numbered I and I1 respectively.

[0023] Preferably, the coordination analysis unit calculates the boiler and turbine coordination coefficient Yril according to the combustion index Rz, the turbine control index Lv and the coordination control data, and the calculation formula is:

[0024]

[0025] In the formula, Yril represents the turbine coordination coefficient, I and I1 represent the response speed of the coordination between the boiler and the turbine and the response speed of the theoretical calculation, Rz represents the combustion index, and Lv represents the turbine control index. It indicates the effective index of the response speed of the coordination between boiler and steam turbine. It indicates the stability index of the coordination between boiler and steam turbine.

[0026] Preferably, the simulation module performs parameter simulation according to the steam turbine coordination coefficient Yril. After the simulation is verified to be qualified, the parameters are substituted into the system to calculate the formula of the steam turbine coordination coefficient Yril. When the calculated steam turbine coordination coefficient Yril is between 0.9 and 1, the simulation test is ended.

[0027] Preferably, the safety protection module is used to handle emergency situations of the combustion control unit, the steam turbine valve control unit and the coordination control unit. When the steam turbine coordination coefficient Yril is below 0.8, emergency response measures are immediately initiated and the alarm module is notified.

[0028] Preferably, the alarm module performs situation diagnosis according to the emergency situation of the safety protection module and notifies relevant maintenance personnel through the network.

[0029] Compared with the prior art, the present invention provides an AGC coordinated control system for a coal-fired boiler, which has the following features:

[0030] Beneficial effects:

[0031] 1. The present invention monitors the usage and supply of carbon monoxide through the coal-fired boiler online monitoring equipment of the AGC coordinated control system, which helps to prevent the accumulation of dangerous gases, thereby ensuring the safety of operators and equipment. At the same time, the system can reduce the emission of pollutants such as carbon monoxide and other harmful gases produced by incomplete combustion by optimizing the combustion process, thereby bringing environmental protection and cleanliness effects to the environment; in addition, by calculating the combustion index, the system can monitor the combustion process in real time and quickly adjust the operating parameters to adapt to the changing operating conditions to maintain the optimal performance of the boiler. The above operating means enable the AGC coordinated control system to improve the efficiency of coal-fired boilers while taking into account the needs of environmental protection and safety. Through the division of labor and cooperation of the automatic mode between modules in the system, the problem of unstable combustion, coking and over-temperature caused by manual operation mode is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the present invention; DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1, an AGC coordinated control system for a coal-fired boiler, the system includes a monitoring module, a calculation module, a simulation module, a safety protection module and an alarm module;

[0035] The monitoring module includes a boiler combustion control unit, a steam turbine valve control unit and a coordination control unit;

[0036] The boiler combustion control unit obtains boiler combustion data through the boiler online monitoring equipment, numbers it, and connects it to the calculation module through the network. The steam turbine valve control unit obtains steam turbine valve control data through the steam turbine online monitoring equipment, numbers it, and connects it to the calculation module through the network. The coordination control unit obtains coordination control data through network sensors, and the monitoring module and the calculation module share data through the network.

[0037] The calculation module includes a combustion analysis unit, a turbine valve adjustment analysis unit and a coordination analysis unit. The combustion analysis unit calculates the combustion index Rz according to the boiler combustion data, the turbine valve adjustment analysis unit calculates the turbine control index Lv according to the turbine valve adjustment control data, and the coordination analysis unit calculates the boiler and turbine coordination coefficient Yril according to the combustion index Rz, the turbine control index Lv and the coordination control data. The calculation module and the simulation module share data through the network;

[0038] The simulation module performs parameter simulation based on the turbine coordination coefficient Yril, and the simulation module shares data with the safety protection module through the network;

[0039] The safety protection module is used to handle emergency situations of the combustion control unit, turbine valve control unit and coordination control unit. The safety protection module transmits the emergency code to the alarm module via the network as soon as possible for fault diagnosis.

[0040] The boiler combustion control unit numbers the boiler's supply air volume, complete combustion air volume, theoretical maximum heat, actual heat generated by combustion, carbon monoxide supply volume and actual carbon monoxide usage according to the boiler combustion data characteristics. The boiler's supply air volume, complete combustion air volume, actual heat generated by combustion, theoretical maximum heat, carbon monoxide supply volume and actual carbon monoxide usage are numbered X, X1, Y, Y1, Z, Z1 respectively.

[0041] The combustion analysis unit calculates the combustion index Rz based on the boiler combustion data. The calculation formula is:

[0042]

[0043] In the formula, Rz represents the combustion index, X, X1, Y, Y1, Z, and Z1 represent the boiler's air supply, complete combustion air, actual combustion heat, theoretical maximum heat, carbon monoxide supply, and actual carbon monoxide usage, respectively. Indicates the boiler air combustion efficiency index, Indicates the boiler heat effectiveness index, It represents the boiler carbon monoxide combustion effectiveness index, a, b, c represent the weights of boiler air combustion effectiveness index, boiler heat effectiveness index and boiler carbon monoxide combustion effectiveness index in the combustion index respectively.

[0044] The advantages are: monitoring the usage and supply of carbon monoxide through the coal-fired boiler online monitoring equipment of the AGC coordinated control system helps prevent the accumulation of dangerous gases, thereby ensuring the safety of operators and equipment. At the same time, the system can reduce pollutants produced by incomplete combustion, such as carbon monoxide (CO) and other harmful gas emissions, by optimizing the combustion process, thereby bringing a more friendly impact on the environment. In addition, by calculating the combustion index Rz, the system can monitor the combustion process in real time and quickly adjust the operating parameters to adapt to the changing operating conditions to maintain the optimal performance of the boiler. The above operating methods enable the AGC coordinated control system to improve the efficiency of coal-fired boilers while taking into account both environmental protection and safety needs.

[0045] The turbine valve control unit numbers the time when the valve receives the instruction, the time when the valve actually starts to move, and the steam flow data according to the characteristics of the turbine valve control data. The time when the valve receives the instruction and the time when the valve actually starts to move are numbered as T and T1 respectively, and the steam flow data are numbered as V1, V2, V3, ... V n .

[0046] The turbine valve adjustment analysis unit calculates the turbine control index Lv based on the turbine valve adjustment control data. The calculation formula is:

[0047]

[0048] In the formula, Lv represents the calculated turbine control index, T and T1 represent the time when the regulating valve receives the command and the time when the regulating valve actually starts to act, respectively. Indicates the response efficiency, V1, V2, V3, ... V n represents steam flow data, n represents the number of times the steam flow data is counted within a period of time, represents the average value of steam flow, Indicates the stability index of steam flow.

[0049] The advantages are: by accurately measuring and numbering the time when the steam turbine regulating valve receives the instruction and the time when it actually starts to act, and calculating the response efficiency, the response time of the steam turbine regulating valve can be analyzed and adjusted. By adjusting the response time, the response parameters can be changed or the memory can be optimized to reduce the response delay, while improving the unit's response speed to load changes. By real-time monitoring of the regulating valve's response efficiency and steam flow data, possible failures can be prevented to achieve basic data maintenance. At the same time, combining the parameters of the two parts to calculate the steam flow stability index can effectively monitor and adjust the stability of the steam flow, ultimately reducing unit operation instability and equipment wear caused by flow fluctuations.

[0050] The coordinated control unit numbers the coordinated response speed between the boiler and the steam turbine and their theoretically calculated response speed under the same load demand according to the coordinated control data characteristics. The coordinated response speed between the boiler and the steam turbine and their theoretically calculated response speed are numbered I and I1 respectively.

[0051] The coordination analysis unit calculates the boiler and turbine coordination coefficient Yril based on the combustion index Rz, turbine control index Lv and coordination control data. The calculation formula is:

[0052]

[0053] In the formula, Yril represents the turbine coordination coefficient, I and I1 represent the response speed of the coordination between the boiler and the turbine and the response speed of the theoretical calculation, Rz represents the combustion index, and Lv represents the turbine control index. It indicates the effective index of the response speed of the coordination between boiler and steam turbine. It indicates the stability index of the coordination between boiler and steam turbine.

[0054] The advantage is that by combining the response speed effective index, combustion index Rz and turbine control index Lv between the boiler and the steam turbine to calculate the turbine coordination coefficient Yril, close coordination between the boiler and the steam turbine can be achieved, ensuring that the efficiency of energy conversion is maximized and energy loss is reduced during the entire power generation process.

[0055] The simulation module performs parameter simulation based on the steam turbine coordination coefficient Yril. After the simulation is verified to be qualified, the parameters are substituted into the system to calculate the formula of the steam turbine coordination coefficient Yril. When the calculated steam turbine coordination coefficient Yril is between 0.9 and 1, the simulation test is ended, indicating that the system state and performance at this time can reach excellent levels. After adjusting the parameters, the stability and response speed have reached the expected goals. At this time, the simulation test phase can be ended and the formal application phase can be entered to officially enable these optimized parameters.

[0056] The safety protection module is used to handle emergency situations of the combustion control unit, the steam turbine valve control unit and the coordination control unit. When the steam turbine coordination coefficient Yril is below 0.8, it indicates that the system is in a non-ideal state and there may be response delays or unstable steam flow problems. Staff must intervene immediately and initiate emergency response measures. First, automatically adjust the steam flow parameters or shut down the steam function to prevent further damage, implement autonomous rescue, and notify the alarm module at the same time.

[0057] The alarm module diagnoses the situation according to the emergency status of the safety protection module and notifies the relevant maintenance personnel through the network. The diagnosis results are immediately sent to the relevant maintenance personnel through the network to ensure that they can receive accurate fault information, so that they can quickly and effectively solve the problem, reduce downtime, and ensure the stable operation of the system.

[0058] The advantages are: through the joint work of these three modules (simulation module, safety protection module, and alarm module), the adjustment performance and safety of the system are improved. The simulation module can adjust the parameters and then conduct simulation tests to ensure the best effect of the parameters, and then apply these parameters to normal work, thereby ensuring that the stability and response speed of the system reach the expected goals; the safety protection module has an autonomous rescue function, which can detect potential risks in time and take measures, thereby improving the safety and reliability of the system. Once a problem is found, the module will immediately transmit the information to the alarm module, and the alarm module is responsible for notifying relevant maintenance personnel in time, ensuring the efficiency of problem handling. This automated process reduces human intervention, improves the level of automation, and ensures the stable operation of the entire system.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An AGC coordinated control system for a coal-fired boiler, characterized in that: The system includes a monitoring module, a calculation module, a simulation module, a safety protection module and an alarm module; The monitoring module includes a boiler combustion control unit, a steam turbine valve control unit and a coordination control unit; The boiler combustion control unit obtains boiler combustion data through the boiler online monitoring device, numbers it, and connects it to the calculation module through the network. The steam turbine valve control unit obtains steam turbine valve control data through the steam turbine online monitoring device, numbers it, and connects it to the calculation module through the network. The coordination control unit obtains coordination control data through the network sensor, and the monitoring module and the calculation module share data through the network. The calculation module includes a combustion analysis unit, a turbine valve adjustment analysis unit and a coordination analysis unit. The combustion analysis unit calculates the combustion index Rz according to the boiler combustion data, the turbine valve adjustment analysis unit calculates the turbine control index Lv according to the turbine valve adjustment control data, and the coordination analysis unit calculates the boiler and turbine coordination coefficient Yril according to the combustion index Rz, the turbine control index Lv and the coordination control data. The calculation module and the simulation module share data through the network; The simulation module performs parameter simulation according to the turbine coordination coefficient Yril, and the simulation module shares data with the safety protection module through the network; The safety protection module is used to handle emergency situations of the combustion control unit, the turbine valve control unit and the coordination control unit. The safety protection module transmits the emergency code to the alarm module via the network in the first time for fault diagnosis.

2. The AGC coordinated control system for a coal-fired boiler according to claim 1, characterized in that: The boiler combustion control unit numbers the boiler's supply air volume, complete combustion air volume, theoretical maximum heat, actual heat generated by combustion, carbon monoxide supply volume and actual carbon monoxide usage according to the boiler combustion data characteristics. The boiler's supply air volume, complete combustion air volume, actual heat generated by combustion, theoretical maximum heat, carbon monoxide supply volume and actual carbon monoxide usage are numbered X, X1, Y, Y1, Z, Z1, respectively.

3. The AGC coordinated control system for a coal-fired boiler according to claim 2, characterized in that: The combustion analysis unit calculates the combustion index Rz according to the boiler combustion data, and the calculation formula is: In the formula, Rz represents the combustion index, X, X1, Y, Y1, Z, and Z1 represent the boiler's air supply, complete combustion air, actual combustion heat, theoretical maximum heat, carbon monoxide supply, and actual carbon monoxide usage, respectively. Indicates the boiler air combustion efficiency index, Indicates the boiler heat effectiveness index, It represents the boiler carbon monoxide combustion effectiveness index, a, b, c represent the weights of boiler air combustion effectiveness index, boiler heat effectiveness index and boiler carbon monoxide combustion effectiveness index in the combustion index respectively.

4. The AGC coordinated control system for a coal-fired boiler according to claim 1, characterized in that: The turbine valve control unit numbers the time when the valve receives the instruction, the time when the valve actually starts to act, and the steam flow data according to the characteristics of the turbine valve control data. The time when the valve receives the instruction and the time when the valve actually starts to act are numbered T and T1 respectively, and the steam flow data are numbered V1, V2, V3, ... V n .

5. The AGC coordinated control system for a coal-fired boiler according to claim 4, characterized in that: The turbine valve adjustment analysis unit calculates the turbine control index Lv according to the turbine valve adjustment control data, and the calculation formula is: In the formula, Lv represents the calculated turbine control index, T and T1 represent the time when the regulating valve receives the command and the time when the regulating valve actually starts to act, respectively. Indicates the response efficiency, V1, V2, V3, ... V n represents steam flow data, n represents the number of times the steam flow data is counted within a period of time, represents the average value of steam flow, Indicates the stability index of steam flow.

6. The AGC coordinated control system for a coal-fired boiler according to claim 1, characterized in that: The coordination control unit numbers the response speed of the coordination between the boiler and the steam turbine and the response speed calculated theoretically under the same load demand according to the characteristics of the coordination control data. The response speed of the coordination between the boiler and the steam turbine and the response speed calculated theoretically are numbered I and I1 respectively.

7. The AGC coordinated control system for a coal-fired boiler according to claim 6, characterized in that: The coordination analysis unit calculates the boiler and turbine coordination coefficient Yril according to the combustion index Rz, the turbine control index Lv and the coordination control data, and the calculation formula is: In the formula, Yril represents the turbine coordination coefficient, I and I1 represent the response speed of the coordination between the boiler and the turbine and the response speed of the theoretical calculation, Rz represents the combustion index, and Lv represents the turbine control index. It indicates the effective index of the response speed of the coordination between boiler and steam turbine. It indicates the stability index of the coordination between boiler and steam turbine.

8. The AGC coordinated control system for a coal-fired boiler according to claim 7, characterized in that: The simulation module performs parameter simulation according to the turbine coordination coefficient Yril. After the simulation is verified to be qualified, the parameters are substituted into the system to calculate the formula of the turbine coordination coefficient Yril. When the calculated turbine coordination coefficient Yril is between 0.9 and 1, the simulation test is ended.

9. The AGC coordinated control system for a coal-fired boiler according to claim 8, characterized in that: The safety protection module is used to handle emergency situations of the combustion control unit, the turbine valve control unit and the coordination control unit. When the turbine coordination coefficient Yril is below 0.8, emergency response measures are immediately initiated and the alarm module is notified.

10. The AGC coordinated control system for a coal-fired boiler according to claim 9, characterized in that: The alarm module performs situation diagnosis according to the emergency situation of the safety protection module and notifies relevant maintenance personnel through the network.

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