A full-cycle gas unit PSA nitrogen production coupling nitrogen supply control method

Abstract

The application discloses a full-cycle gas unit PSA nitrogen production coupling nitrogen supply control method, relates to the PSA nitrogen production control technical field, and comprises the following steps: using the existing public compressed air system of a power plant as a PSA nitrogen production raw material gas source; automatically switching the nitrogen production machine operation mode according to the nitrogen use characteristics of different stages of the capital construction period and the operation and maintenance period; purifying and stabilizing the pressure of the raw material gas, and supplying the prepared nitrogen to each nitrogen use scene; monitoring and safety interlocking protection are performed on the nitrogen pressure, purity and flow; and the temporary expansion module is configured to realize integrated configuration of the full-cycle nitrogen production. The method uses the existing public compressed air system of a power plant as a PSA nitrogen production raw material gas source, does not separately configure a nitrogen production special air compressor, and solves the problem of large initial investment caused by repeated configuration of the air compressor of the existing independent PSA nitrogen production system.

Description

Technical Field

[0001] This invention relates to the field of PSA nitrogen production control technology, and in particular to a full-cycle PSA nitrogen production coupled nitrogen supply control method for gas turbine units. Background Technology

[0002] With the continuous advancement of my country's new power system construction, gas-steam combined cycle generator units, as the core supporting power source for peak shaving and frequency regulation, are experiencing a significant increase in start-up and shutdown frequencies and equipment maintenance frequencies, placing higher demands on the stability, purity, and economy of nitrogen supply. During the construction and operation and maintenance phases of gas-fired generator units, nitrogen is widely used in critical operational processes such as natural gas pipeline purging, system replacement, equipment troubleshooting, and waste heat boiler maintenance. The quality of nitrogen supply directly affects operational safety, project progress, and operating costs.

[0003] Currently, gas-fired power plants primarily use industrial nitrogen cylinder banks for nitrogen supply. This involves purchasing or leasing high-pressure nitrogen cylinders, manually changing the cylinders, and adjusting the pressure before connecting them to the point of use. This method has revealed numerous problems in practical application: the nitrogen supply pressure fluctuates significantly due to factors such as the remaining gas volume in the cylinder, ambient temperature, and cylinder-changing operations, easily leading to incomplete natural gas replacement and the formation of explosive gas mixtures, posing significant safety hazards; large-scale replacement operations require frequent cylinder changes, resulting in high labor intensity, low efficiency, and single replacement cycles lasting several days; the purchase, leasing, transportation, storage, and labor costs of the cylinder banks are high, leading to poor economic efficiency throughout their lifecycle; furthermore, cylinder handling and high-altitude connection procedures involve high-risk operations such as cylinder tipping, gas leakage, and nitrogen asphyxiation, posing a severe challenge to on-site safety management.

[0004] To address the aforementioned issues, some power plants have begun to explore configuring independent PSA nitrogen generation systems for on-site nitrogen production. However, existing PSA nitrogen generation systems typically consist of a separate air compressor, post-processing equipment, and storage tank for the nitrogen generation unit, forming a complete independent system. This approach has significant technical drawbacks: Firstly, gas-fired power plants already have a shared compressed air system for instrument control and maintenance during the construction and operation phases. Deploying a dedicated nitrogen generation air compressor results in redundant equipment construction, significantly increasing initial investment. Secondly, independent nitrogen generation systems lack synergy between the construction and operation / maintenance phases. The high-flow nitrogen demand during construction and the high-purity, stable nitrogen demand during operation / maintenance cannot be simultaneously met within a single system, often requiring repeated modifications or the addition of temporary equipment, leading to low overall system utilization and poor lifecycle benefits. More critically, existing technologies have not yet achieved deep integration between the nitrogen generation system and the power plant's shared systems. There is a lack of integrated design in areas such as feedstock gas extraction, pressure matching, and flow regulation, failing to fully utilize the power plant's existing resources.

[0005] In summary, how to fully utilize the existing public compressed air system of the power plant to achieve stable nitrogen supply throughout the entire lifecycle of infrastructure construction and operation and maintenance, and to have the ability to automatically switch between high flow rate and high purity modes, while reducing initial investment and operating costs and improving operational safety, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] This invention provides a full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method. By utilizing the power plant's existing public compressed air system as the raw gas source for PSA nitrogen production and without configuring a separate dedicated nitrogen production air compressor, it solves the problem of high initial investment caused by the repeated configuration of air compressors in existing independent PSA nitrogen production systems.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides a full-cycle PSA nitrogen production coupled nitrogen supply control method for gas turbine units, comprising: S1 utilizes the power plant's existing public compressed air system as the feedstock for PSA nitrogen production; S2 automatically switches the nitrogen generator operating mode according to the nitrogen usage characteristics at different stages of the infrastructure construction and operation and maintenance phases; S3 purifies and stabilizes the raw gas, and supplies the generated nitrogen to various nitrogen-using scenarios. S4 provides real-time monitoring and safety interlock protection for nitrogen pressure, purity, and flow rate; The S5, through the configuration of a temporary expansion module, achieves integrated configuration throughout the entire nitrogen production cycle.

[0008] The beneficial effects of the technical solution provided by this invention include at least the following: The method of this invention utilizes the existing public compressed air system of the gas-fired power plant as the raw material gas source for PSA nitrogen production, eliminating the need to configure a separate air compressor for the nitrogen production system, thus avoiding redundant equipment construction from the source and significantly reducing the initial investment cost.

[0009] This invention automatically switches between high-flow-rate mode and high-purity stable mode according to the nitrogen usage characteristics at different stages of the infrastructure and operation and maintenance phases. It can simultaneously meet the high-flow-rate nitrogen demand for natural gas pipeline purging and system replacement during the infrastructure phase, as well as the high-purity nitrogen demand for equipment troubleshooting and waste heat boiler maintenance during the operation and maintenance phase. This achieves integrated utilization throughout the entire cycle, eliminating the need for repeated modifications and significantly improving the overall system utilization rate.

[0010] This invention purifies and stabilizes the raw gas from the public compressed air system before it enters the PSA nitrogen generator. The generated nitrogen is then connected to a storage tank and distributed to various nitrogen-using scenarios. This completely eliminates the traditional cylinder group nitrogen supply operation mode that relies on manual cylinder changing and pressure adjustment. The nitrogen supply pressure is stable, the purity is reliable, and the operation efficiency is greatly improved.

[0011] This invention, by real-time monitoring of nitrogen pressure, purity, and flow rate and automatically implementing interlock protection in case of abnormalities, technically eliminates the major safety hazard of explosive gas mixtures caused by incomplete natural gas replacement due to substandard nitrogen purity or abnormal pressure. At the same time, it eliminates high-risk operations such as cylinder handling, high-altitude connection, and cylinder replacement and pressure adjustment, thereby fundamentally avoiding the safety risks of cylinder tipping, gas leakage, and nitrogen asphyxiation. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a flowchart of the full-cycle gas turbine PSA nitrogen production coupled nitrogen supply control method provided in the embodiments of the present invention. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0015] Example A method for controlling nitrogen production coupled with nitrogen supply in a full-cycle gas turbine unit using a PSA system.

[0016] Please refer to Figure 1 This is a flowchart of the full-cycle gas turbine PSA nitrogen production coupled nitrogen supply control method provided in the embodiments of the present invention.

[0017] S1, establish a prediction library for nitrogen usage scenarios covering the entire lifecycle of infrastructure construction and operation and maintenance; S101 connects the raw material gas inlet of the PSA nitrogen generator to the maintenance compressed air header of the power plant's existing public compressed air system through a pipeline, without configuring a separate nitrogen-generating air compressor. It should be noted that the specific steps are as follows: an air intake interface is opened on the maintenance compressed air main pipe of the existing public compressed air system of the power plant, and the air intake interface is connected to the raw material gas inlet of the PSA nitrogen generator through a stainless steel pipe. The pipe connection is connected by a flange and equipped with a shut-off valve and a check valve to realize the parallel coupling of the PSA nitrogen generator system and the compressed air system.

[0018] The absence of a dedicated nitrogen-generating air compressor specifically refers to utilizing the existing air compressor group in the power plant's public compressed air system as the sole source of raw material gas for the PSA nitrogen generation system. The nitrogen generation system itself does not have any type of air compressor, and all raw material gas for the nitrogen generation system is taken from the public compressed air system. The air compressor group is configured with four micro-oil screw air compressors, with two operating and two on standby during normal operation. When the PSA nitrogen generation system is started or running, there is no need to start a dedicated air compressor; the raw material gas is directly obtained from the compressed air header supplied by the operating air compressors.

[0019] S102, a pressure reducing valve and a pressure stabilizing device are installed on the coupling pipeline to adjust the raw material gas pressure to the rated working pressure range of the PSA nitrogen generator.

[0020] It should be noted that the installation of pressure reducing valve and pressure stabilizing device on the coupling pipeline specifically includes: a precision filter, a pilot-operated precision pressure reducing valve and a pressure stabilizing tank are installed sequentially along the airflow direction on the coupling pipeline. The precision filter has a filtration accuracy of 0.01μm. The pressure reducing valve adjusts the raw material gas pressure from the rated pressure of the compressed air main pipe to the pressure range required by the PSA nitrogen generator inlet. The pressure stabilizing tank is used to buffer pressure fluctuations and keep the raw material gas pressure entering the PSA nitrogen generator stable.

[0021] The specific adjustment process is as follows: Based on the rated working pressure parameters of the PSA nitrogen generator, set the outlet pressure of the pressure reducing valve to 0.6MPa to 0.8MPa, so that the pressure of the raw material gas entering the PSA nitrogen generator is always maintained within the optimal working range of the equipment, ensuring nitrogen production efficiency and nitrogen purity.

[0022] S2 automatically switches the nitrogen generator operating mode according to the nitrogen usage characteristics at different stages of the infrastructure construction and operation and maintenance phases; S201, Establish a nitrogen usage scenario identification mechanism during the infrastructure construction and operation and maintenance phases as a basis for determining the operation mode; It should be noted that when the current stage is identified as the infrastructure construction phase, the control system automatically switches to the high-flow mode, and the PSA nitrogen generator operates continuously at maximum gas production, shortening the switching cycle between adsorption and regeneration to meet the high-flow nitrogen demand for natural gas pipeline purging, system replacement, etc. When the current stage is identified as the operation and maintenance phase, the control system automatically switches to the high-purity stable mode, extending the adsorption time and optimizing the timing ratio of pressure equalization and regeneration to ensure that the nitrogen purity reaches more than 99.9%, meeting the high-purity nitrogen demand for equipment troubleshooting, waste heat boiler maintenance, etc.

[0023] S202, the control system switches the nitrogen generator operating mode according to the nitrogen usage scenario; The operating modes include high flow rate mode and high purity stable mode.

[0024] It should be noted that switching to high-flow mode specifically includes: the control system shortening the adsorption time parameter of the PSA nitrogen generator to 60% to 80% of the rated adsorption time and shortening the pressure equalization time parameter to 50% to 70% of the rated pressure equalization time, thereby increasing the switching frequency of the adsorption tower to 1.2 to 1.5 times the rated frequency; at the same time, the energy-saving circulation function is forcibly shut down, so that the air compressor maintains full-load continuous operation, and the PSA nitrogen generator continuously supplies gas at 100% of the rated gas production capacity; when there is a phased demand for ultra-high flow nitrogen during the construction period, the control system automatically activates the temporary expansion module, which is connected in parallel to the mobile nitrogen generator skid or an additional backup gas storage tank is opened to achieve instantaneous expansion of gas production capacity.

[0025] Switching to the high-purity stable mode specifically includes: the control system extending the adsorption time parameter of the PSA nitrogen generator to 120% to 150% of the rated adsorption time, allowing the carbon molecular sieve to fully adsorb oxygen and improve the purity of nitrogen separation; optimizing the timing ratio of pressure equalization and regeneration, adjusting the pressure equalization time to 15% to 20% of the adsorption time and the regeneration time to 80% to 100% of the adsorption time, ensuring that residual oxygen in the adsorption tower is fully discharged during the regeneration process; and introducing purity feedback control, installing an online purity analyzer at the nitrogen storage tank outlet. When the nitrogen purity is detected to be below 99.9%, the control system automatically extends the adsorption time of the current adsorption tower or shortens the regeneration time until the purity is restored to above the set threshold.

[0026] The nitrogen-based scene recognition mechanism specifically includes: The control system communicates with the distributed control system of the gas turbine unit to obtain the current operating status signal of the unit. When the signal is obtained that the unit has not yet completed its first grid connection or has not passed the 168-hour continuous trial operation, the current stage is determined to be the infrastructure construction period. When the control system and the infrastructure management system communicate through the task instruction interface, the system determines the construction period when it receives an infrastructure construction task instruction and the maintenance period when it receives an operation and maintenance task instruction.

[0027] It should be noted that the switching process between high-flow mode and high-purity stable mode specifically includes the following: When the control system determines that the current stage is switching from the construction phase to the operation and maintenance phase, it does not directly switch the operating mode, but executes a gradual transition procedure. That is, during the transition window of 48 to 72 hours, the gas production rate is gradually reduced and the purity setpoint is increased. The daily adjustment range does not exceed 30% of the total adjustment, so that the pressure field and concentration field inside the adsorption tower of the PSA nitrogen generator are smoothly transitioned, avoiding disturbance of the molecular sieve bed or drastic fluctuations in nitrogen purity due to sudden changes in operating parameters. At the same time, the control system automatically issues a removal command for the temporary expansion module, notifying the operation and maintenance personnel to remove the mobile nitrogen generator skid or additional gas storage tank temporarily connected during the construction phase, completing the seamless switch of the system from the construction phase configuration to the operation and maintenance phase configuration.

[0028] S3 purifies and stabilizes the raw gas, and supplies the resulting nitrogen to various nitrogen-using scenarios. S301 purifies the raw material air from the public compressed air system by passing it through a precision filter and a refrigerated dryer in sequence, removing oil, moisture and solid particles from the compressed air, so that the dew point of the raw material air meets the intake requirements of the PSA nitrogen generator. It should be noted that the purification process specifically includes: the raw gas first enters a precision filter group, which includes at least a primary filter and a secondary filter. The primary filter is used to filter solid particles with a diameter greater than 1 μm, and the secondary filter is used to filter oil mist and solid particles with a diameter greater than 0.01 μm, reducing the oil content of the raw gas to below 0.01 ppm. The raw gas after precision filtration enters a refrigerated dryer, where the compressed air is cooled to 2°C to 5°C through a refrigeration system, causing the water vapor in the raw gas to condense and precipitate. The condensate is then discharged through a gas-liquid separator, reducing the pressure dew point of the raw gas to below -20°C.

[0029] S302, the purified raw material gas is put into the buffer tank for pressure stabilization, and then sent to the PSA nitrogen generator for nitrogen separation; It should be noted that the pressure stabilization process specifically includes: the purified raw gas enters a buffer tank, the volume of which is configured to be 1.5 to 2 times the rated gas production capacity of the PSA nitrogen generator; a pressure reducing valve is installed at the inlet of the buffer tank to stabilize the raw gas pressure within the range of 0.6 MPa to 0.8 MPa; a pressure transmitter is installed at the outlet of the buffer tank to monitor the outlet pressure in real time. When the pressure fluctuation exceeds the set range, the control system performs closed-loop regulation by adjusting the opening of the pressure reducing valve to ensure that the pressure fluctuation range of the raw gas entering the PSA nitrogen generator does not exceed ±0.02 MPa.

[0030] S303 connects the generated nitrogen to a nitrogen storage tank via pipeline, and then connects it to nitrogen supply points during the construction and maintenance phases via branch gas supply pipelines, enabling the nitrogen generation system to meet the nitrogen supply needs of multiple scenarios simultaneously.

[0031] It should be noted that the nitrogen supply branch system specifically includes: nitrogen produced by the PSA nitrogen generator is first connected to a nitrogen storage tank, the volume of which is configured to be 1.2 to 1.5 times the peak gas consumption of the maximum nitrogen usage scenario; a branch gas supply main pipe is set at the outlet of the nitrogen storage tank, and the main pipe is connected in parallel to the gas supply branch during the construction period and the gas supply branch during the operation and maintenance period. Each branch is independently equipped with a switch valve, pressure regulating valve and flow meter; the gas supply branch during the construction period is reserved with a quick connector for connecting a temporary gas supply hose to the natural gas replacement point or pipeline purging point; the gas supply branch during the operation and maintenance period is connected to the nitrogen interface of the natural gas pressure regulating station, the pre-module, the fuel module and the waste heat boiler through a fixed pipeline.

[0032] The nitrogen generation system automatically identifies the current nitrogen usage scenario type and matches the corresponding gas supply parameters based on the nitrogen usage instructions received in real time. Nitrogen usage scenarios include pipeline purging during infrastructure construction, equipment troubleshooting during operation and maintenance, and waste heat boiler maintenance.

[0033] It should be noted that when the system is identified as a pipeline purging scenario during the infrastructure construction phase, the gas supply branch for the infrastructure construction phase will be automatically activated, and the nitrogen pressure will be adjusted to 0.4MPa to 0.6MPa to continuously supply gas at the maximum flow rate. When the system is identified as a troubleshooting scenario during the operation and maintenance phase, the gas supply branch for the operation and maintenance phase will be automatically activated, and the nitrogen purity will be prioritized to be controlled above 99.9% to supply gas intermittently at a stable flow rate. When the system is identified as a waste heat boiler maintenance scenario, two gas supply branches will be activated simultaneously or a high flow rate mode will be used for continuous gas supply, and the gas supply duration and number of gas exchanges will be automatically set according to the boiler maintenance procedures.

[0034] S4 provides real-time monitoring and safety interlock protection for nitrogen pressure, purity, and flow rate; S401, pressure sensors, purity analyzers and flow meters are installed at the outlet of the nitrogen storage tank and on the branch gas supply pipeline to monitor nitrogen supply parameters in real time; It should be noted that the real-time monitoring of nitrogen supply parameters specifically includes: installing an online oxygen content analyzer on the nitrogen storage tank outlet pipeline to continuously detect nitrogen purity and transmit it to the control system in real time with a 4-20mA signal; installing pressure transmitters and vortex flow meters on the branch gas supply pipelines to collect gas supply pressure and instantaneous flow data at a sampling frequency of not less than 1 time / second; and the control system comparing the collected data with preset safety thresholds, pressure fluctuation ranges, and flow upper limits in real time.

[0035] S402, the control system takes corresponding execution commands based on the monitored nitrogen supply parameters.

[0036] It should be noted that when the nitrogen purity is detected to be lower than the safety threshold, the control system automatically closes the gas supply valve and triggers an alarm to prevent impure nitrogen from entering the natural gas replacement system and forming an explosive mixture. When abnormal fluctuations in gas supply pressure or excessive flow are detected, the control system automatically performs flow limiting or cut-off protection to ensure nitrogen supply safety.

[0037] The execution instructions also include interlocking protection mechanisms, including primary purity interlocking protection and secondary emergency cut-off protection.

[0038] It should be noted that when the control system detects both substandard purity and abnormal pressure fluctuations, it will prioritize the purity interlock protection and unconditionally shut off the gas supply valve. When the pressure drop rate exceeds 0.05 MPa / s, it is determined to be a pipeline leak, and the control system will skip the flow limiting adjustment procedure and directly execute the emergency shut-off protection.

[0039] The S5 can achieve integrated configuration throughout the entire nitrogen production cycle by configuring a temporary expansion module; S501, during the infrastructure construction period, is equipped with a temporary expansion module to meet the phased large-flow nitrogen demand during the infrastructure construction period by adding a mobile nitrogen generator skid; It should be noted that after the unit is put into operation, the temporary expansion module will be removed, and the core nitrogen generation system will be retained for stable nitrogen supply during the operation and maintenance period. Specifically, after the unit completes 168 hours of continuous trial operation and is officially handed over for production, the control system will issue a command to remove the temporary expansion module. On-site operators will close the inlet and outlet valves of the temporary expansion module, disassemble the flange connection bolts, remove the mobile nitrogen generator skid or temporary gas storage tank, and seal or install blind flanges on the parallel interfaces to restore the independent operation of the core nitrogen generation system.

[0040] The S502 control system has built-in switching logic between the infrastructure construction period and the operation and maintenance period. When it detects that the unit is connected to the grid for the first time or the 168-hour trial operation is completed, it automatically switches the system configuration parameters from the infrastructure construction period mode to the operation and maintenance period mode.

[0041] It should be noted that the control system has preset parameters for the infrastructure construction period and parameters for the operation and maintenance period. The parameters for the infrastructure construction period include the upper limit of gas production, the lower limit of adsorption time, and the lower limit of purity. The parameters for the operation and maintenance period include the economic range of gas production, the optimized value of adsorption time, and the upper limit of purity. The control system monitors the unit's operating status signals in real time, including the unit's first grid connection signal, the signal indicating the completion of 168 hours of continuous trial operation, and the unit's load change signal.

[0042] The configuration of the temporary expansion module specifically includes: before the start of the infrastructure construction period, calculating the specifications of the temporary expansion module based on the peak nitrogen demand during the infrastructure construction period, adding a parallel interface at the outlet of the nitrogen storage tank of the core nitrogen generation system, and connecting it to the mobile nitrogen generator skid or temporary gas storage tank via flange connection; the mobile nitrogen generator skid has an independent adsorption tower and control system built in it, which operates in parallel with the core nitrogen generation system to jointly supply nitrogen to the nitrogen usage points during the infrastructure construction period; the temporary gas storage tank, by increasing the gas storage volume, smooths out the pressure fluctuations caused by the large-flow replacement operation during the infrastructure construction period.

[0043] It should be noted that when the control system simultaneously receives the unit's first grid connection signal and the 168-hour continuous trial operation completion signal, it triggers the mode switching program and performs the following operations: First, it lowers the PSA nitrogen generator's gas production setpoint from the maximum gas production during the construction period to the economic gas production during the operation and maintenance period; second, it adjusts the adsorption time parameter from the short-cycle mode during the construction period to the optimized cycle mode during the operation and maintenance period; third, it raises the nitrogen purity control target from 95% to meet the replacement requirements during the construction period to over 99.9% to meet the equipment maintenance requirements during the operation and maintenance period; fourth, it switches the air compressor group's joint control strategy from prioritizing nitrogen production gas supply during the construction period to prioritizing instrument gas supply during the operation and maintenance period, with the surplus supply for nitrogen production.

[0044] Furthermore, it should be noted that the present invention can be provided as a method, apparatus, or computer program product. Therefore, embodiments of the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, embodiments of the present invention can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code.

[0045] The embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0046] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing terminal equipment to cause a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0047] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0048] Finally, it should be noted that the above description represents a preferred embodiment of the present invention. It should be pointed out that although preferred embodiments have been described, those skilled in the art, once they understand the basic inventive concept of the present invention, can make various improvements and modifications without departing from the principles described herein. These improvements and modifications should also be considered within the scope of protection of the present invention. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

Claims

1. A method for controlling the coupling of nitrogen production and supply in a PSA (Power Supply Actuation) system for a full-cycle gas turbine unit, characterized in that: include: S1 utilizes the power plant's existing public compressed air system as the feedstock for PSA nitrogen production; S2 automatically switches the nitrogen generator operating mode according to the nitrogen usage characteristics at different stages of the infrastructure construction and operation and maintenance phases; S3 purifies and stabilizes the raw gas, and supplies the generated nitrogen to various nitrogen-using scenarios. S4 provides real-time monitoring and safety interlock protection for nitrogen pressure, purity, and flow rate; The S5, through the configuration of a temporary expansion module, achieves integrated configuration throughout the entire nitrogen production cycle.

2. The full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method as described in claim 1, characterized in that, S1 utilizes the power plant's existing public compressed air system as the feedstock gas source for PSA nitrogen production, wherein: S101 connects the raw material gas inlet of the PSA nitrogen generator to the maintenance compressed air header of the power plant's existing public compressed air system through a pipeline, without configuring a separate nitrogen-generating air compressor. S102, a pressure reducing valve and a pressure stabilizing device are installed on the coupling pipeline to adjust the raw material gas pressure to the rated working pressure range of the PSA nitrogen generator.

3. The full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method as described in claim 1, characterized in that, The S2 automatically switches the nitrogen generator operating mode according to the nitrogen usage characteristics at different stages of the infrastructure construction and operation and maintenance phases, wherein: S201, Establish a nitrogen usage scenario identification mechanism during the infrastructure construction and operation and maintenance phases as a basis for determining the operation mode; S202, the control system switches the nitrogen generator operating mode according to the nitrogen usage scenario; The operating modes include high flow rate mode and high purity stable mode.

4. The full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method as described in claim 3, characterized in that, The mechanism for identifying nitrogen usage scenarios during the infrastructure and operation / maintenance phases is described above, wherein: The nitrogen-using scene recognition mechanism specifically includes: The control system communicates with the distributed control system of the gas turbine unit to obtain the current operating status signal of the unit. When the signal is obtained that the unit has not yet completed its first grid connection or has not passed the 168-hour continuous trial operation, the current stage is determined to be the infrastructure construction period. When the control system and the infrastructure management system communicate through the task instruction interface, the system determines the construction period when it receives an infrastructure construction task instruction and the maintenance period when it receives an operation and maintenance task instruction.

5. The full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method as described in claim 1, characterized in that, S3 purifies and stabilizes the raw gas, and distributes the resulting nitrogen to various nitrogen-using scenarios, wherein: S301 purifies the raw material air from the public compressed air system by passing it through a precision filter and a refrigerated dryer in sequence, removing oil, moisture and solid particles from the compressed air, so that the dew point of the raw material air meets the intake requirements of the PSA nitrogen generator. S302, the purified raw material gas is put into the buffer tank for pressure stabilization, and then sent to the PSA nitrogen generator for nitrogen separation; S303 connects the generated nitrogen to a nitrogen storage tank via pipeline, and then connects it to nitrogen supply points during the construction and maintenance phases via branch gas supply pipelines, enabling the nitrogen generation system to meet the nitrogen supply needs of multiple scenarios simultaneously.

6. The full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method as described in claim 5, characterized in that, The nitrogen generation system is designed to simultaneously meet the nitrogen supply needs of multiple scenarios, wherein: The nitrogen generation system automatically identifies the current nitrogen usage scenario type and matches the corresponding gas supply parameters based on the real-time nitrogen usage instructions received. The nitrogen usage scenarios include pipeline purging during the infrastructure construction phase, equipment troubleshooting during the operation and maintenance phase, and waste heat boiler maintenance.

7. The full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method as described in claim 1, characterized in that, The S4 provides real-time monitoring and safety interlock protection for nitrogen pressure, purity, and flow rate, wherein: S401, pressure sensors, purity analyzers and flow meters are installed at the outlet of the nitrogen storage tank and on the branch gas supply pipeline to monitor nitrogen supply parameters in real time; S402, the control system takes corresponding execution commands based on the monitored nitrogen supply parameters.

8. The full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method as described in claim 7, characterized in that, The control system executes corresponding commands based on the monitored nitrogen supply parameters, wherein: The execution command also includes an interlocking protection mechanism, including primary purity interlocking protection and secondary emergency cut-off protection.

9. The full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method as described in claim 1, characterized in that, The S5, through the configuration of a temporary expansion module, achieves integrated configuration for the entire nitrogen production cycle, wherein: S501, during the infrastructure construction period, is equipped with a temporary expansion module to meet the phased large-flow nitrogen demand during the infrastructure construction period by adding a mobile nitrogen generator skid; The S502 control system has built-in switching logic between the infrastructure construction period and the operation and maintenance period. When it detects that the unit is connected to the grid for the first time or the 168-hour trial operation is completed, it automatically switches the system configuration parameters from the infrastructure construction period mode to the operation and maintenance period mode.

10. The full-cycle gas turbine unit PSA nitrogen production coupled nitrogen supply control method as described in claim 9, characterized in that, The provision of temporary expansion modules during the infrastructure construction phase includes: The configuration of the temporary expansion module specifically includes: before the start of the infrastructure construction period, calculating the specifications of the temporary expansion module based on the maximum peak nitrogen demand during the infrastructure construction period, adding a parallel interface at the outlet of the nitrogen storage tank of the core nitrogen generation system, and connecting it to a mobile nitrogen generator skid or a temporary gas storage tank via flange connection; the mobile nitrogen generator skid has an independent built-in adsorption tower and control system, which operates in parallel with the core nitrogen generation system to jointly supply nitrogen to the nitrogen usage points during the infrastructure construction period; the temporary gas storage tank, by increasing the gas storage volume, smooths out pressure fluctuations caused by large-flow replacement operations during the infrastructure construction period.

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