A boiler working condition CEMS marking method and system based on DCS system logic judgment

Abstract

The present application relates to the technical field of thermal power generation, and particularly relates to a DCS system logic judgment boiler working condition CEMS marking method and system, the method comprises the following steps: acquiring a plurality of unit signals of a power plant boiler; then, a distributed control system is used to perform logic configuration judgment according to the plurality of unit signals to obtain target working condition data; or, the distributed control system is used to perform logic configuration judgment according to the plurality of unit signals and known working condition data to obtain target working condition data. The DCS system logic judgment boiler working condition CEMS marking method and system can realize real-time monitoring of the operation of production facilities and pollution control facilities, and does not need manual reporting of related conditions, so that the accuracy is high, the timeliness is good, the superior management system can realize real-time and accurate control of enterprise production, and the superior management system can realize automatic monitoring, real-time online supervision, and more accurate monitoring of production dynamics.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, and in particular to a method and system for marking boiler operating conditions using CEMS for logical judgment in a DCS system. Background Technology

[0002] A thermal power plant, or coal-fired power plant for short, is a factory that uses combustible materials (such as coal) as fuel to produce electricity. Its basic production process is as follows: when the fuel is burned, it heats water to generate steam, which converts the chemical energy of the fuel into heat energy. The steam pressure drives the turbine to rotate, converting the heat energy into mechanical energy. Then the turbine drives the generator to rotate, converting the mechanical energy into electrical energy.

[0003] Thermal power plants generate large amounts of flue gas during power generation, which contains significant amounts of pollutants and dust. Therefore, thermal power plants typically employ real-time monitoring measures at the pollutant emission outlets. Examples include a continuous emission monitoring device for flue gas disclosed in existing technology CN 217773674U, and a pretreatment system based on a continuous emission monitoring system disclosed in existing technology CN219201521U. However, as can be seen from the disclosed technologies, existing continuous emission monitoring systems only perform online real-time monitoring of pollutant emission outlets or pretreatment of pollutant emission outlets, thus presenting the following technical problems: The superior management system failed to monitor the operation of production facilities and pollution control facilities. The status of production facilities and pollution control facilities, such as shutdown, startup, operation, and maintenance, required manual reporting. The superior management system could not grasp the company's production situation in real time and accurately. Summary of the Invention

[0004] The main objective of this invention is to overcome the shortcomings of existing technologies and provide a method and system for marking boiler operating conditions using CEMS (Conductivity, Technology, and Manufacturing) logic judgment in a DCS (Distributed Control System). This method and system offer advantages such as automatic monitoring by the upper-level management system, real-time online supervision, and more precise monitoring of production dynamics.

[0005] The technical solution adopted by this invention to achieve its technical objective is: a boiler operating condition CEMS marking method for DCS system logic judgment, comprising: Acquire signals from various units in the power plant boiler; The target operating condition data is obtained by performing logical configuration judgments based on various unit signals through a distributed control system, or by performing logical configuration judgments based on various unit signals and known operating condition data through a distributed control system.

[0006] Preferably, the unit signals include a first signal representing the loss of flame across the entire coal seam via an NOT gate, a second signal representing the closing of the generator outlet circuit breaker, and a third signal representing a manual reset signal; the step of obtaining target operating condition data by performing logical configuration judgments based on multiple unit signals through the distributed control system includes: The output of the first AND gate is obtained by using the output of the first signal through the turn-delay timer and the output of the second signal through the NOT gate as inputs to the first AND gate. The output of the first OR gate is obtained by passing the second and third signal turn-on pulse signals through the output of the monostable multivibrator; The outputs of the first AND gate and the first OR gate are used as inputs to the first RS flip-flop. The output of the first RS flip-flop is then used as the start-up condition signal, and the start-up condition signal is used as the target condition data.

[0007] Preferably, the unit signal further includes a fourth signal indicating whether the load is greater than 30%; the step of obtaining the target operating condition data by performing logical configuration judgment through the distributed control system based on multiple unit signals and known operating condition data includes: The start-up condition signal is passed through the output of the turn-off delay timer, and the second signal is passed through the output of the 5-second permanent pulse, which are used as the inputs of the second AND gate to obtain the output of the second AND gate. By using the fifth, sixth, seventh, and eighth signals as inputs to the third AND gate, the output of the third AND gate is obtained. The output of the second signal, delayed by 240 minutes by the on-delay timer, the fourth signal, and the output of the third AND gate are used as inputs to the second OR gate to obtain the output of the second OR gate; The outputs of the second AND gate and the second OR gate are used as the inputs of the second RS flip-flop. The output of the second RS flip-flop is then used as the grid-connected operating condition signal, and the grid-connected operating condition signal is used as the target operating condition data.

[0008] Preferably, the unit signals further include a ninth signal indicating whether the oxygen content at the exhaust outlet is less than or equal to 19%, a tenth signal indicating whether the flue gas velocity at the exhaust outlet is greater than or equal to 2 meters per second, an eleventh signal indicating whether the flue gas flow rate at the exhaust outlet is greater than 20%, and a twelfth signal indicating whether the flue gas temperature at the exhaust outlet is greater than 40 degrees Celsius; the step of obtaining target operating condition data by performing logical configuration judgments based on multiple unit signals and known operating condition data through a distributed control system includes: The start-up condition signal, grid connection condition signal, and fourth signal are used as the inputs of the fourth AND gate through the output of the monostable multivibrator to obtain the output of the fourth AND gate; By using the ninth, tenth, eleventh, and twelfth signals as inputs to the third OR gate, the F0 signal is obtained. Using the second signal and the F0 signal as inputs to the fifth AND gate, the output of the fifth AND gate is obtained; The outputs of the fourth AND gate and the fifth AND gate are used as inputs to the fourth OR gate to obtain the output of the fourth OR gate. The output of the fourth OR gate and the start-up condition signal are used as the input of the third RS flip-flop. The output of the third RS flip-flop is used as the shutdown condition signal, and the shutdown condition signal is used as the target condition data.

[0009] Preferably, the step of obtaining target operating condition data by performing logical configuration judgments based on multiple unit signals and known operating condition data through a distributed control system includes: The second signal is passed through a NOT gate and the output of a monostable multivibrator, along with the shutdown condition signal, as the input to the fourth RS flip-flop. The output of the fourth RS flip-flop is then used as the shutdown condition signal, and the shutdown (machine) condition signal is used as the target condition data.

[0010] Preferably, the unit signals further include a thirteenth signal indicating whether the generator active power is less than 30%, a fourteenth signal indicating a manual disconnection command, and a fifteenth signal indicating whether the generator active power is less than 50%; the step of obtaining target operating condition data by performing logical configuration judgments based on multiple unit signals and known operating condition data through the distributed control system includes: The thirteenth signal is delayed for 30 seconds by a turn-on delay timer and then passed through a monostable multivibrator to obtain the F1 signal; The output of the fourteenth signal through a monostable multivibrator, the fifteenth signal, the output of the shutdown (machine) condition signal through an inverted gate, and the output of the shutdown condition signal through an inverted gate are used as inputs to the sixth AND gate to obtain the output of the sixth AND gate; Using the F1 signal and the output of the sixth AND gate as the input of the fifth OR gate, we obtain the output of the fifth OR gate; The output of the fifth OR gate and the second signal are used as the input of the fifth RS flip-flop. The output of the fifth RS flip-flop is used as the decoupling condition signal, and the decoupling condition signal is used as the target condition data.

[0011] Preferably, the unit signal further includes a sixteenth signal representing the maintenance handling button signal; the step of obtaining the target operating condition data by performing logical configuration judgment through the distributed control system based on multiple unit signals and known operating condition data includes: The shutdown condition signal and the sixteenth signal are used as the input of the seventh AND gate through the output of the monostable multivibrator. The output of the seventh AND gate is used as the shutdown (maintenance) condition signal, and the shutdown (maintenance) condition signal is used as the target condition data.

[0012] Preferably, the unit signals further include a seventeenth signal representing a fault / accident button signal; the step of obtaining target operating condition data by performing logical configuration judgment based on multiple unit signals through the distributed control system includes: The fault / accident button signal is used as the fault / accident condition signal, and the fault / accident condition signal is used as the target condition data.

[0013] Preferably, the step of obtaining target operating condition data by performing logical configuration judgments based on multiple unit signals and known operating condition data through a distributed control system includes: The output of the NOT gate is used as the input of the eighth AND gate to obtain the output of the eighth AND gate, which is the output of the tripping operation signal, boiler (machine) shutdown operation signal, shutdown operation signal, shutdown (maintenance and handling) operation signal, grid connection operation signal, and fault / accident operation signal. The normal operation signal is used as the target operation signal.

[0014] A distributed control system that uses the CEMS marking method for boiler operating conditions based on the DCS system logic judgment described above.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: By acquiring multiple unit signals from power plant boilers, and then using a distributed control system to perform logical configuration judgments based on these multiple unit signals to obtain target operating condition data, or by using a distributed control system to perform logical configuration judgments based on multiple unit signals and known operating condition data to obtain target operating condition data, the upper-level management system can monitor the operation of production facilities and pollution control facilities in real time, including their status of operation, shutdown, startup, operation, and maintenance. This eliminates the need for manual reporting of relevant information, resulting in high accuracy and timeliness. The upper-level management system can accurately grasp the enterprise's production situation in real time, enabling automatic monitoring and real-time online supervision, thus providing more precise monitoring of production dynamics. Attached Figure Description

[0016] Figure 1 This is a step-by-step diagram of the boiler operating condition marking method in power plants.

[0017] Figure 2 This is a logic diagram for obtaining the start-up operating condition signal.

[0018] Figure 3 This is a logic diagram for obtaining grid-connected operating condition signals.

[0019] Figure 4 This is a logic diagram for obtaining the shutdown condition signal.

[0020] Figure 5 This is a logic diagram for obtaining the shutdown (machine) condition signal.

[0021] Figure 6 This is a logic diagram for obtaining the disconnection condition signal.

[0022] Figure 7 This is a logic diagram for obtaining the shutdown (maintenance) condition signal.

[0023] Figure 8 This is a logic diagram for obtaining fault / accident condition signals.

[0024] Figure 9 This is a logic diagram for obtaining normal operating condition signals. Implementation

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention. Example

[0028] Please see Figure 1 A method for marking boiler operating conditions using CEMS for logical judgment in a DCS system, comprising: Step S100: Acquire various unit signals from the power plant boiler; Step S200: The distributed control system performs logical configuration judgment based on various unit signals to obtain target operating condition data; or, the distributed control system performs logical configuration judgment based on various unit signals and known operating condition data to obtain target operating condition data.

[0029] In this embodiment, the boiler operating conditions are divided into 8 states, namely "disconnection", "shutdown", "outage", "outage (maintenance)", "startup", "grid connection", "fault / accident", and "normal operation". The corresponding target operating condition data are disconnection operating condition signal, shutdown operating condition signal, outage operating condition signal, outage (maintenance) operating condition signal, startup operating condition signal, grid connection operating condition signal, fault / accident operating condition signal, and normal operation operating condition signal.

[0030] The above-mentioned method for marking the operating conditions of power plant boilers enables automatic monitoring, real-time online supervision, and more accurate monitoring of production dynamics. Example

[0031] Please see Figure 1-9 Based on the above embodiments, the CEMS marking method for boiler operating conditions logically determined by this DCS system is as follows: The unit signals include a first signal representing the loss of flame across the entire coal seam, a second signal representing the closing of the generator outlet circuit breaker, and a third signal representing a manual reset signal; the process of obtaining target operating condition data through logical configuration judgment based on multiple unit signals by the distributed control system includes: The output of the first signal turn-on delay timer (delayed by 30 seconds) and the output of the second signal NOT gate are used as the inputs of the first AND gate to obtain the output of the first AND gate. The output of the first OR gate is obtained by passing the second and third signal turn-on pulse signals through the output of the monostable multivibrator; The set signal output of the first AND gate and the reset signal output of the first OR gate are used as inputs to the first RS flip-flop. The output of the first RS flip-flop is used as the start-up condition signal, and the start-up condition signal is used as the target condition data.

[0032] The determination time for the first signal through the conduction delay timer is 30 seconds.

[0033] The period from boiler startup in a cold or hot state to "unit grid connection for power generation" is marked as "startup," and a startup status signal is output. The duration marked as "startup" generally does not exceed 24 hours, except for those that need to be extended due to other objective factors.

[0034] Furthermore, the unit signals also include a fourth signal indicating that the generator active power is greater than or equal to 30%, a fifth signal indicating whether the calculated dust content is greater than or equal to 0 and less than or equal to 10, a sixth signal indicating whether the calculated SO2 content in the clean flue gas is greater than or equal to 0 and less than or equal to 35, a seventh signal indicating whether the calculated NOx content in the clean flue gas is greater than or equal to 0 and less than or equal to 50, and an eighth signal indicating confirmation of environmental protection parameters; the process of obtaining target operating condition data by performing logical configuration judgments based on multiple unit signals and known operating condition data through the distributed control system includes: The start-up condition signal is passed through the output of the turn-off delay timer, and the second signal is passed through the output of the 5-second permanent pulse, which are used as the inputs of the second AND gate to obtain the output of the second AND gate. By using the fifth, sixth, seventh, and eighth signals as inputs to the third AND gate, the output of the third AND gate is obtained. The output of the second signal, delayed by 240 minutes by the on-delay timer, the fourth signal, and the output of the third AND gate are used as inputs to the second OR gate to obtain the output of the second OR gate; The outputs of the second AND gate and the second OR gate are used as the inputs of the second RS flip-flop. The output of the second RS flip-flop is then used as the grid-connected operating condition signal, and the grid-connected operating condition signal is used as the target operating condition data.

[0035] The determination time for the start-up condition signal through the turn-off delay is 2 seconds; the determination time for the second signal through the monostable trigger is 5 seconds; and the determination time for the second signal through the turn-on delay is 240 minutes.

[0036] The period from when the unit is connected to the grid to when the boiler pollution control facilities reach normal operating status is marked as "grid connected," and a grid connection status signal is output. The duration marked as "grid connected" generally does not exceed 4 hours. If an extension is necessary due to other objective factors, the maximum duration shall not exceed 8 hours, and supporting documents such as automatic monitoring data, facility performance parameters, and automatic generator control (AGC) system records for at least one year must be retained for future reference.

[0037] Furthermore, the unit signals also include a ninth signal indicating whether the oxygen content at the exhaust outlet is less than or equal to 19%, a tenth signal indicating whether the flue gas velocity at the exhaust outlet is greater than or equal to 2 meters per second, an eleventh signal indicating whether the flue gas flow rate at the exhaust outlet is greater than 20%, and a twelfth signal indicating whether the flue gas temperature at the exhaust outlet is greater than 40 degrees Celsius; the target operating condition data is obtained by performing logical configuration judgments based on multiple unit signals and known operating condition data through the distributed control system, including: The start-up condition signal, grid connection condition signal, and fourth signal are used as the inputs of the fourth AND gate through the output of the monostable multivibrator to obtain the output of the fourth AND gate; By using the ninth, tenth, eleventh, and twelfth signals as inputs to the third OR gate, the F0 signal is obtained. Using the second signal and the F0 signal as inputs to the fifth AND gate, the output of the fifth AND gate is obtained; The outputs of the fourth AND gate and the fifth AND gate are used as inputs to the fourth OR gate to obtain the output of the fourth OR gate. The output of the fourth OR gate and the start-up condition signal are used as the input of the third RS flip-flop. The output of the third RS flip-flop is used as the shutdown condition signal, and the shutdown condition signal is used as the target condition data.

[0038] The determination time for the fourth signal by the monostable multivibrator is 5 seconds.

[0039] After the unit is disconnected from the grid, the period from "boiler shutdown" to "restart" is marked as "shutdown," and a shutdown condition signal is output. Additionally, it should be noted that when the automatic monitoring data at the exhaust outlet shows: oxygen content ≤19%, flue gas velocity ≥2 m / s, or flue gas temperature >40℃, "shutdown" must not be marked.

[0040] Furthermore, the step of obtaining target operating condition data by performing logical configuration judgments based on various unit signals and known operating condition data through a distributed control system includes: The second signal is passed through a NOT gate and the output of a monostable multivibrator, along with the shutdown condition signal, as the input to the fourth RS flip-flop. The output of the fourth RS flip-flop is then used as the shutdown condition signal, and the shutdown (machine) condition signal is used as the target condition data.

[0041] The second signal is determined by a monostable multivibrator in 5 seconds.

[0042] The period from "unit disconnection from grid" to "boiler shutdown" is marked as "shutdown," and a shutdown status signal is output. It is important to note that during this period, parameters such as flue gas velocity, flow rate, and temperature from the automatic monitoring data at the exhaust outlet gradually decrease, while oxygen content gradually increases, requiring appropriate measures to be taken accordingly.

[0043] Furthermore, the unit signals also include a thirteenth signal indicating whether the generator active power is less than 30%, a fourteenth signal indicating a manual disconnection command, and a fifteenth signal indicating whether the generator active power is less than 50%; the step of obtaining target operating condition data by performing logical configuration judgments based on multiple unit signals and known operating condition data through the distributed control system includes: The thirteenth signal is delayed for 30 seconds by a turn-on delay timer and then passed through a monostable multivibrator to obtain the F1 signal; The output of the fourteenth signal through a monostable multivibrator, the fifteenth signal, the output of the shutdown (machine) condition signal through an inverted gate, and the output of the shutdown condition signal through an inverted gate are used as inputs to the sixth AND gate to obtain the output of the sixth AND gate; Using the F1 signal and the output of the sixth AND gate as the input of the fifth OR gate, we obtain the output of the fifth OR gate; The output of the fifth OR gate and the second signal are used as the input of the fifth RS flip-flop. The output of the fifth RS flip-flop is used as the decoupling condition signal, and the decoupling condition signal is used as the target condition data.

[0044] The decision time for the thirteenth signal through the turn-on delay is 30 seconds, and the decision time for the monostable multivibrator is 2 seconds.

[0045] The period from "boiler load drops to 50% or below" to "before the unit is disconnected from the grid" is marked as "disconnection," and a disconnection status signal is output. The duration marked as "disconnection" should not exceed 2 hours.

[0046] Furthermore, the unit signals also include a sixteenth signal representing the maintenance handling button signal; the step of obtaining target operating condition data by performing logical configuration judgments based on multiple unit signals and known operating condition data through the distributed control system includes: The shutdown condition signal and the sixteenth signal are used as the input of the seventh AND gate through the output of the monostable multivibrator. The output of the seventh AND gate is used as the shutdown (maintenance) condition signal, and the shutdown (maintenance) condition signal is used as the target condition data.

[0047] When a boiler / gas turbine is shut down, maintenance or repair of production facilities or pollution control facilities may cause the automatic monitoring data at the exhaust gas outlet to temporarily fail to meet the requirements for marking "shutdown" (oxygen content > 19% and flue gas velocity < 2 m / s). In this case, the system will be marked as "maintenance," and a maintenance status signal will be output. It is important to note that for systems marked as "maintenance," relevant maintenance records for the production facilities and pollution control facilities, automatic generator control (AGC) system records, automatic monitoring data records, and other supporting documentation must be retained for future reference.

[0048] Furthermore, the unit signals also include a seventeenth signal representing the fault / accident button signal; the step of obtaining target operating condition data by performing logical configuration judgment based on multiple unit signals through the distributed control system includes: The fault / accident button signal is used as the fault / accident condition signal, and the fault / accident condition signal is used as the target condition data.

[0049] The period during which a production facility or pollution control facility malfunctions or experiences an accident, including the maintenance and repair phase of the equipment or facility and the grid connection before resuming normal operation, is marked as a "fault" and a fault condition signal is output.

[0050] It should be noted that for boilers marked "Fault / Accident," the duration of continuous pollutant emissions due to each fault or accident should not exceed 4 hours, and the total annual emission should not exceed 60 hours. The cause of the fault or accident must be described. If a fault or accident occurs during boiler grid connection or disconnection, it should be marked as "Grid Connection" or "Disconnection" first.

[0051] Furthermore, the step of obtaining target operating condition data by performing logical configuration judgments based on various unit signals and known operating condition data through a distributed control system includes: The output of the NOT gate is used as the input of the seventh AND gate to obtain the output of the seventh AND gate, which is the output of the tripping operation signal, boiler (machine) shutdown operation signal, shutdown operation signal, shutdown (maintenance and handling) operation signal, grid connection operation signal, and fault / accident operation signal. The normal operation operation signal is used as the target operation condition data.

[0052] During periods when the following markings are not made: “Disconnection”, “Shutdown”, “Out of Service”, “Out of Service (Maintenance)”, “Start-up”, “Grid Connection”, “Fault / Accident”, or “Normal Operation”, the boiler is considered to be in “Normal Operation” and will output a normal operation condition signal.

[0053] The solution in this embodiment can be selectively combined with solutions in other embodiments. Example

[0054] Please see Figure 1 A distributed control system that uses the CEMS marking method for boiler operating conditions based on the logic judgment of the DCS system as described above.

[0055] A distributed control system (DCS) is a microprocessor-based control system that employs the design principles of decentralized control functions, centralized display and operation, and a balance between decentralized autonomy and comprehensive coordination. DCS is also known as a distributed control system or a distributed computer control system.

[0056] It adopts the basic design concept of decentralized control and centralized operation and management, and uses a multi-level, hierarchical, cooperative and autonomous structure. Its main feature is its centralized management and decentralized control, which usually adopts a hierarchical structure. Each level consists of several subsystems, and each subsystem achieves several specific and finite objectives, forming a pyramid structure.

[0057] The solution in this embodiment can be selectively combined with solutions in other embodiments.

[0058] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of this invention. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this invention, or equivalent structural, procedural, or functional transformations made using the description and drawings of this invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this invention.

Claims

1. A method for marking boiler operating conditions using CEMS in a DCS system for logical judgment, characterized in that, include: Acquire signals from various units in the power plant boiler; The target operating condition data is obtained by performing logical configuration judgment based on various unit signals through a distributed control system, or by performing logical configuration judgment based on various unit signals and known operating condition data through a distributed control system. The unit signals include a first signal representing the loss of flame across the entire coal seam via an NOT gate, a second signal representing the closing of the generator outlet circuit breaker, and a third signal representing a manual reset signal; the distributed control system performs logical configuration judgments based on multiple unit signals to obtain target operating condition data, including: The output of the first signal turn-on delay timer (delayed by 30 seconds) and the output of the second signal NOT gate are used as the input of the first AND gate to obtain the set signal output of the first AND gate. The second and third signal turn-on pulse signals are used as the input of the first OR gate through the output of the monostable multivibrator to obtain the reset signal output of the first OR gate; The set signal output of the first AND gate and the reset signal output of the first OR gate are used as the inputs of the first RS flip-flop, and the output of the first RS flip-flop is used as the start-up condition signal. The start-up condition signal is used as the target condition data. The unit signals also include a fourth signal indicating that the generator active power is greater than or equal to 30%, a fifth signal indicating whether the calculated dust content is greater than or equal to 0 and less than or equal to 10, a sixth signal indicating whether the calculated SO2 content in the clean flue gas is greater than or equal to 0 and less than or equal to 35, a seventh signal indicating whether the calculated NOx content in the clean flue gas is greater than or equal to 0 and less than or equal to 50, and an eighth signal indicating confirmation of environmental protection parameters; the target operating condition data is obtained by performing logical configuration judgment based on multiple unit signals and known operating condition data through the distributed control system, including: The start-up condition signal is passed through the output of the turn-off delay timer, and the second signal is passed through the output of the 5-second permanent pulse, which are used as the inputs of the second AND gate to obtain the output of the second AND gate. By using the fifth, sixth, seventh, and eighth signals as inputs to the third AND gate, the output of the third AND gate is obtained. The output of the second signal, delayed by 240 minutes by the on-delay timer, the fourth signal, and the output of the third AND gate are used as inputs to the second OR gate to obtain the output of the second OR gate; The output of the second AND gate and the output of the second OR gate are used as the input of the second RS flip-flop. The output of the second RS flip-flop is used as the grid-connected operating condition signal, and the grid-connected operating condition signal is used as the target operating condition data. The unit signals also include a ninth signal indicating whether the oxygen content at the exhaust outlet is less than or equal to 19%, a tenth signal indicating whether the flue gas velocity at the exhaust outlet is greater than or equal to 2 meters per second, an eleventh signal indicating whether the flue gas flow rate at the exhaust outlet is greater than 20%, and a twelfth signal indicating whether the flue gas temperature at the exhaust outlet is greater than 40 degrees Celsius; the target operating condition data is obtained by performing logical configuration judgments based on multiple unit signals and known operating condition data through the distributed control system, including: The start-up condition signal, grid connection condition signal, and fourth signal are used as the inputs of the fourth AND gate through the output of the monostable multivibrator to obtain the output of the fourth AND gate; By using the ninth, tenth, eleventh, and twelfth signals as inputs to the third OR gate, the F0 signal is obtained. Using the second signal and the F0 signal as inputs to the fifth AND gate, the output of the fifth AND gate is obtained; The outputs of the fourth AND gate and the fifth AND gate are used as inputs to the fourth OR gate to obtain the output of the fourth OR gate. The output of the fourth OR gate and the start-up condition signal are used as the input of the third RS flip-flop. The output of the third RS flip-flop is used as the shutdown condition signal, and the shutdown condition signal is used as the target condition data.

2. The boiler operating condition CEMS marking method for logical judgment in a DCS system according to claim 1, characterized in that: The process of obtaining target operating condition data by performing logical configuration judgments based on various unit signals and known operating condition data through a distributed control system includes: The second signal is passed through a NOT gate and the output of a monostable multivibrator, along with the shutdown condition signal, as the input to the fourth RS flip-flop. The output of the fourth RS flip-flop is then used as the shutdown condition signal, and the shutdown (machine) condition signal is used as the target condition data.

3. The boiler operating condition CEMS marking method for logical judgment in a DCS system according to claim 2, characterized in that: The unit signals also include a thirteenth signal indicating whether the generator's active power is less than 30%, a fourteenth signal indicating a manual disconnection command, and a fifteenth signal indicating whether the generator's active power is less than 50%. The process of obtaining target operating condition data by performing logical configuration judgments based on various unit signals and known operating condition data through a distributed control system includes: The thirteenth signal is delayed for 30 seconds by a turn-on delay timer and then passed through a monostable multivibrator to obtain the F1 signal; The output of the fourteenth signal through a monostable multivibrator, the fifteenth signal, the output of the shutdown (machine) condition signal through an inverted gate, and the output of the shutdown condition signal through an inverted gate are used as inputs to the sixth AND gate to obtain the output of the sixth AND gate; Using the F1 signal and the output of the sixth AND gate as the input of the fifth OR gate, we obtain the output of the fifth OR gate; The output of the fifth OR gate and the second signal are used as the input of the fifth RS flip-flop. The output of the fifth RS flip-flop is used as the decoupling condition signal, and the decoupling condition signal is used as the target condition data.

4. The boiler operating condition CEMS marking method for logical judgment in a DCS system according to claim 3, characterized in that: The unit signals also include a sixteenth signal representing the maintenance handling button signal; the process of obtaining target operating condition data by performing logical configuration judgments based on multiple unit signals and known operating condition data through the distributed control system includes: The shutdown condition signal and the sixteenth signal are used as the input of the seventh AND gate through the output of the monostable multivibrator. The output of the seventh AND gate is used as the shutdown (maintenance) condition signal, and the shutdown (maintenance) condition signal is used as the target condition data.

5. The boiler operating condition CEMS marking method for DCS system logic judgment according to claim 4, characterized in that: The unit signals also include a seventeenth signal that represents the fault / accident button signal; The process of obtaining target operating condition data by performing logical configuration judgments based on various unit signals through a distributed control system includes: The fault / accident button signal is used as the fault / accident condition signal, and the fault / accident condition signal is used as the target condition data.

6. The boiler operating condition CEMS marking method for DCS system logic judgment according to claim 5, characterized in that: The process of obtaining target operating condition data by performing logical configuration judgments based on various unit signals and known operating condition data through a distributed control system includes: The output of the NOT gate is used as the input of the eighth AND gate to obtain the output of the eighth AND gate, which is the output of the tripping operation signal, boiler (machine) shutdown operation signal, shutdown operation signal, shutdown (maintenance and handling) operation signal, grid connection operation signal, and fault / accident operation signal. The normal operation signal is used as the target operation signal.

7. A distributed control system, characterized in that, The boiler operating condition CEMS marking method is applied to the DCS system logic judgment as described in any one of claims 1 to 6.

Images