Deep peak-shaving low-carbon operation method and system for gas turbine unit

Abstract

The invention relates to the technical field of gas power generation, and discloses a gas unit deep peak regulation low-carbon operation method and system.The method comprises the steps that a peak regulation instruction is received, and the peak regulation instruction is compared with the real-time operation load of a gas unit; and when the real-time operation load is larger than the peak regulation instruction, the unit load is kept unchanged, the on-grid electric quantity is output according to the peak regulation instruction, water electrolysis hydrogen production is conducted on the remaining electric quantity of the gas unit, and the prepared hydrogen is conveyed back to the gas unit for hydrogen-doped combustion of the gas unit. After a deep peak regulation instruction of the unit is received, the load of the unit is kept stable, alternating-current and direct-current conversion is carried out on residual electricity under the condition that the power grid electric quantity requirement is met, and generated direct current is used for electrolyzing water to produce hydrogen to ensure that the actual operation of the unit is consistent and unchanged, and the influence of load change on the service life of the unit is avoided; and meanwhile, prepared hydrogen is conveyed back to the gas unit for hydrogen-doped combustion of the gas unit, so that the energy utilization efficiency is improved while carbon emission is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas power generation, and particularly relates to a method and system for deep peak shaving and low-carbon operation of a gas unit. Background Art

[0002] With the large-scale promotion of new energy technologies in China, the country actively advocates the consumption of clean power generation such as wind and solar, thereby effectively reducing the carbon emissions of power generation enterprises in China and providing effective support for the realization of China's "dual carbon" goal.

[0003] The existing deep peak shaving of gas units mainly utilizes the advantages of fast load response speed of gas units to perform deep peak shaving on the units. For example, when there is a demand for deep peak shaving, generally only a simple reduction in load is adopted, and hot start is achieved under high load commands. Although gas units have the advantage of rapid load response, there are still problems such as excessive pollution of nitrogen oxides during startup. At the same time, frequent startup or load change causes certain damage to the components of gas units, increases the maintenance frequency of the units, and poses certain potential hazards to the safe and stable operation of the units. Summary of the Invention

[0004] In view of this, the present invention provides a method and system for deep peak shaving and low-carbon operation of a gas unit to solve the problems of how to avoid frequent load increase and decrease and low-carbon operation during the deep peak shaving of a gas unit.

[0005] In a first aspect, the present invention provides a method for deep peak shaving and low-carbon operation of a gas unit, the method comprising:

[0006] Receiving a peak shaving instruction, and comparing the peak shaving instruction with the real-time operating load of the gas unit;

[0007] When the real-time operating load is greater than the peak shaving instruction, keep the unit load unchanged, output the grid-connected power according to the peak shaving instruction, electrolyze water to produce hydrogen with the surplus power of the gas unit, and transport the prepared hydrogen back to the gas unit for hydrogen-doped combustion of the gas unit.

[0008] The method for deep peak shaving and low-carbon operation of a gas unit provided by the present invention keeps the load of the unit stable after receiving the deep peak shaving instruction of the unit. Under the condition of meeting the grid power demand, the surplus power is converted between AC and DC, and the generated direct current is used for electrolyzing water to produce hydrogen to ensure that the actual operation of the unit remains unchanged, avoiding the impact of load changes on the life of the unit. At the same time, the prepared hydrogen is transported back to the gas unit for hydrogen-doped combustion of the gas unit, reducing carbon emissions and improving energy utilization efficiency.

[0009] In an optional embodiment, electrolyzing water to produce hydrogen with the surplus power of the gas unit and transporting the prepared hydrogen back to the gas unit for hydrogen-doped combustion of the gas unit includes:

[0010] Start the AC-DC conversion device to convert the remaining power into direct current;

[0011] Start the hydrogen production device to produce hydrogen by electrolyzing water using the remaining power;

[0012] Transport the produced hydrogen back to the gas turbine unit for hydrogen-blended combustion of the gas turbine unit.

[0013] In an optional implementation manner, the method further includes: starting a desulfurization and denitrification flue gas purification device to perform desulfurization and denitrification purification treatment on the flue gas of the gas turbine unit.

[0014] The desulfurization and denitrification flue gas purification device uses activated coke or other technologies to treat the flue gas of the gas turbine unit, which can significantly reduce pollutant emissions and improve the cleanliness of energy utilization.

[0015] In an optional implementation manner, the method further includes: starting a carbon capture device to perform decarbonization treatment on the purified flue gas.

[0016] The carbon capture device can use the amine method, solid adsorption method or other methods to capture CO2. By performing decarbonization treatment on the flue gas, the carbon emissions of the gas turbine unit are further reduced.

[0017] In an optional implementation manner, the method further includes: starting a methanol preparation device to prepare the produced hydrogen and the captured carbon dioxide into industrial products.

[0018] By preparing the produced hydrogen and the captured carbon dioxide into industrial products, the by-products generated during the operation of the gas turbine unit are converted into resources that can create economic value, thereby improving the overall economic benefits.

[0019] In an optional implementation manner, the method further includes: when the real-time operating load is not greater than the peak shaving instruction, controlling the gas turbine unit to increase the load until the grid-connected power output by the gas turbine unit meets the peak shaving instruction.

[0020] In a second aspect, the present invention provides a deep peak shaving and low-carbon operation system for a gas turbine unit, and the system includes: a gas turbine unit, an AC-DC conversion device and a hydrogen production device, wherein,

[0021] The instruction receiving end of the gas turbine unit receives a peak shaving instruction, the first power transmission end of the gas turbine unit is connected to the grid bus, the second power transmission end of the gas turbine unit is connected to the input end of the AC-DC conversion device, the output end of the AC-DC conversion device is connected to the power supply end of the hydrogen production device, and the first gas output end of the hydrogen production device is connected to the fuel input end of the gas turbine unit;

[0022] The gas unit receives a peak shaving instruction, compares the peak shaving instruction with its own real-time operating load. When the real-time operating load is greater than the peak shaving instruction, the unit load remains unchanged, and the grid-connected power is output according to the peak shaving instruction. At the same time, the AC-DC conversion device is used to convert the surplus power of the gas unit into direct current, and then the direct current is transported to the hydrogen production device for water electrolysis to produce hydrogen. Finally, the produced hydrogen is transported back to the gas unit for hydrogen-doped combustion of the gas unit.

[0023] A deep peak shaving and low-carbon operation system for a gas unit provided by the present invention maintains the load stability of the unit after receiving the deep peak shaving instruction of the unit. Under the condition of meeting the grid power demand, the surplus power is converted between AC and DC, and the generated direct current is used for water electrolysis to produce hydrogen, so as to ensure that the actual operation of the unit remains unchanged and avoid the influence of load changes on the life of the unit. At the same time, the produced hydrogen is transported back to the gas unit for hydrogen-doped combustion of the gas unit, reducing carbon emissions and improving energy utilization efficiency.

[0024] In an optional embodiment, the system further includes: a desulfurization and denitrification flue gas purification device. The flue gas input end of the desulfurization and denitrification flue gas purification device is connected to the flue gas output end of the gas unit, and the desulfurization and denitrification flue gas purification device is used for desulfurization and denitrification purification treatment of the flue gas of the gas unit.

[0025] The desulfurization and denitrification flue gas purification device uses activated coke or other technologies to treat the flue gas of the gas unit, which can significantly reduce pollutant emissions and improve the cleanliness of energy utilization.

[0026] In an optional embodiment, the system further includes: a carbon capture device. The flue gas input end of the carbon capture device is connected to the flue gas output end of the desulfurization and denitrification flue gas purification device, and the carbon capture device is used for decarbonization treatment of the purified flue gas.

[0027] The carbon capture device can adopt the amine method, the solid adsorption method or other methods for CO2 capture. By performing decarbonization treatment on the flue gas, the carbon emissions of the gas unit are further reduced.

[0028] In an optional embodiment, the system further includes: a methanol preparation device. The first gas input end of the methanol preparation device is connected to the second gas output end of the hydrogen production device, and the second gas input end of the methanol preparation device is connected to the gas output end of the carbon capture device. The methanol preparation device is used to prepare industrial products from the produced hydrogen and the captured carbon dioxide.

[0029] By preparing industrial products from the produced hydrogen and the captured carbon dioxide, the by-products generated during the operation of the gas unit are converted into resources that can create economic value, thereby improving the overall economic benefits. Description of the Drawings

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 is a schematic flowchart of the method for deep peak shaving and low-carbon operation of a gas turbine unit according to an embodiment of the present invention;

[0032] Figure 2 is a structural block diagram of the deep peak shaving and low-carbon operation system of a gas turbine unit according to an embodiment of the present invention. Specific Embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can also be the communication inside two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] An embodiment of the present invention provides a method for deep peak-shaving and low-carbon operation of a gas-fired unit, which converts surplus electricity after grid demand into AC / DC, and then uses the produced DC electricity to prepare hydrogen, which is directly blended into the gas-fired unit to achieve the effect of reducing frequent load changes and low-carbon operation.

[0038] According to an embodiment of the present invention, an embodiment of a method for deep peak shaving and low-carbon operation of a gas-fired unit is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that shown here.

[0039] In this embodiment, a method for deep peak load regulation and low carbon operation of a gas turbine is provided. Figure 1 : is a flow chart of a method for deep peak load regulation and low carbon operation of a gas turbine according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0040] Step S1, receiving a peak load shaving instruction, and comparing the peak load shaving instruction with the real-time operating load of the gas unit.

[0041] Specifically, the peak load regulation command is a real-time power control command issued by the power grid dispatching center to cope with power grid load fluctuations (such as peak power consumption in the morning and evening) and ensure voltage and frequency stability. Real-time monitoring of the operating load of gas units requires the coordinated work of sensors, control systems and data platforms to achieve the collection, transmission and analysis of key parameters of the units.

[0042] Step S2, when the real-time operating load is greater than the peak-shaving instruction, the unit load is kept unchanged, the grid-connected power is output according to the peak-shaving instruction, the remaining power of the gas unit is electrolyzed to produce hydrogen, and the prepared hydrogen is transported back to the gas unit for hydrogen-blended combustion of the gas unit.

[0043] Specifically, the deep peak load regulation of gas turbines leads to frequent changes in unit load, aggravated unit temperature changes, and aggravated vibration, which in turn leads to a decrease in combustion efficiency, thereby increasing the maintenance frequency of the unit, increasing the cost of replacing unit components, and increasing the difficulty of control. When the gas unit receives a deep peak load regulation instruction for the unit, such as a load range of 30-60%, it will perform peak load regulation according to the actual load demand of the power grid. The unit maintains the existing efficient combustion state and outputs the grid-connected power according to the load demand instruction of the power grid. The remaining power is converted into direct current through the AC-DC conversion device for off-grid use, such as using the remaining power of the gas unit to electrolyze water to produce hydrogen, and the prepared hydrogen is transported back to the gas unit for hydrogen-blended combustion of the gas unit.

[0044] A method for deep peak shaving and low-carbon operation of a gas unit provided by the present invention maintains the load stability of the unit after receiving the deep peak shaving instruction of the unit. Under the condition of meeting the power grid power demand, the surplus power is converted between AC and DC, and the generated direct current is used for electrolyzing water to produce hydrogen, so as to ensure that the actual operation of the unit remains unchanged, avoid the influence of load changes on the service life of the unit, and at the same time transport the prepared hydrogen back to the gas unit for hydrogen-doped combustion of the gas unit, reducing carbon emissions while improving energy utilization efficiency.

[0045] In an alternative embodiment, electrolyzing water to produce hydrogen with the surplus power of the gas unit and transporting the prepared hydrogen back to the gas unit for hydrogen-doped combustion of the gas unit includes:

[0046] Step S21: Start the AC-DC conversion device to convert the surplus power into direct current.

[0047] Specifically, the AC-DC conversion device usually consists of a three-phase fully controlled bridge rectifier and a filter. The surplus power of the gas unit converts the positive and negative half-cycle waveforms of the alternating current into unidirectional pulsating direct current through the three-phase fully controlled bridge rectifier. Then, the high-frequency ripple is filtered out by the LC filter, and smooth direct current is output.

[0048] Step S22: Start the hydrogen production device to electrolyze water to produce hydrogen using the surplus power.

[0049] Specifically, under the action of the AC-DC conversion device, the surplus power beyond the power grid load demand is used to electrolyze water to produce hydrogen. In this process, a part of the H2 storage device can be synchronously matched to meet the subsequent H2 use.

[0050] Step S23: Transport the prepared hydrogen back to the gas unit for hydrogen-doped combustion of the gas unit.

[0051] Specifically, the prepared H2 can be used for hydrogen-doped combustion of the gas unit in the hydrogen-doped system of the gas turbine to achieve low-carbon operation of the unit. The hydrogen-doped combustion of the gas turbine needs to be precisely controlled, and safety monitoring of the relevant equipment of the gas turbine is carried out to avoid problems such as hydrogen leakage, and to achieve stable and safe operation of the hydrogen-doped gas turbine.

[0052] In an alternative embodiment, the method further includes:

[0053] Step S3: Start the desulfurization and denitrification flue gas purification device to carry out desulfurization and denitrification purification treatment on the flue gas of the gas unit.

[0054] Specifically, the desulfurization and denitrification flue gas purification device can use activated coke or other technologies to carry out desulfurization and denitrification purification treatment on the flue gas of the gas unit. Using activated coke or other technologies by the desulfurization and denitrification flue gas purification device to treat the flue gas of the gas unit can significantly reduce pollutant emissions and improve the cleanliness of energy utilization.

[0055] In an alternative embodiment, the method further includes:

[0056] Step S4: Start the carbon capture device to perform decarbonization treatment on the purified flue gas.

[0057] Specifically, the carbon capture efficiency design of the carbon capture device should preferably meet the requirements of the capture efficiency, and a partial reserve device is also equipped for the generated CO2 to meet the subsequent use of CO2. The carbon capture device can use the amine method, the solid adsorption method or other methods for CO2 capture. By performing decarbonization treatment on the flue gas, the carbon emissions of the gas turbine unit are further reduced.

[0058] In an alternative embodiment, the method further includes:

[0059] Step S5: Start the methanol preparation device to prepare industrial products from the prepared hydrogen and the captured carbon dioxide.

[0060] Specifically, the prepared H2 and the captured CO2 are used to prepare industrial products such as methanol by catalytic process technology. By preparing industrial products from the prepared hydrogen and the captured carbon dioxide, the by-products generated during the operation of the gas turbine unit are converted into resources that can create economic value, thereby improving the overall economic efficiency.

[0061] Meanwhile, if the demand for CO2 is strong, some CO2 can be sold externally. Excess H2 can be sold externally or used for H2-doped combustion of the existing gas turbine unit to achieve low-carbon operation of the unit.

[0062] In an alternative embodiment, the method further includes:

[0063] Step S6: When the real-time operating load is not greater than the peak shaving instruction, control the gas turbine unit to increase the load until the grid-connected power output by the gas turbine unit meets the peak shaving instruction.

[0064] Specifically, when the actual power generation of the gas turbine unit does not reach the requirements of the peak shaving instruction, gradually increase the power generation power of the gas turbine unit until its grid-connected power meets the value of the peak shaving instruction. If the unit still cannot meet the instruction even at its maximum output, it may be necessary to coordinate other power sources (such as energy storage, other generating units) to assist in peak shaving.

[0065] The present invention also provides a deep peak shaving and low-carbon operation system for a gas turbine unit, as Figure 2 shown, including: a gas turbine unit, an AC-DC conversion device and a hydrogen production device. Among them, the instruction receiving end of the gas turbine unit receives the peak shaving instruction, the first power transmission end of the gas turbine unit is connected to the grid bus, the second power transmission end of the gas turbine unit is connected to the input end of the AC-DC conversion device, the output end of the AC-DC conversion device is connected to the power supply end of the hydrogen production device, and the first gas output end of the hydrogen production device is connected to the fuel input end of the gas turbine unit.

[0066] Specifically, the gas turbine unit receives the peak shaving instruction, compares the peak shaving instruction with its own real-time operating load. When the real-time operating load is greater than the peak shaving instruction, the unit maintains its existing efficient combustion state, outputs the grid-connected power according to the peak shaving instruction. At the same time, using the AC-DC conversion device, the surplus power of the gas turbine unit is converted into direct current, and then the direct current is transported to the hydrogen production device for water electrolysis to produce hydrogen. Finally, the prepared hydrogen is transported back to the gas turbine unit for hydrogen-doped combustion of the gas turbine unit. During the process of water electrolysis to produce hydrogen, some H2 storage devices can be synchronously matched to meet the subsequent H2 usage.

[0067] A deep peak shaving and low-carbon operation system for a gas turbine unit provided by the present invention maintains the load stability of the unit after receiving the deep peak shaving instruction of the unit. Under the condition of meeting the grid power demand, the surplus power is converted between AC and DC, and the generated direct current is used for water electrolysis to produce hydrogen, so as to ensure that the actual operation of the unit remains unchanged, avoid the influence of load changes on the service life of the unit. At the same time, the prepared hydrogen is transported back to the gas turbine unit for hydrogen-doped combustion of the gas turbine unit, reducing carbon emissions and improving energy utilization efficiency.

[0068] In an alternative embodiment, as Figure 2 shown, the system further includes: a desulfurization and denitrification flue gas purification device. The flue gas input end of the desulfurization and denitrification flue gas purification device is connected to the flue gas output end of the gas turbine unit. The desulfurization and denitrification flue gas purification device is used for desulfurization and denitrification purification treatment of the flue gas of the gas turbine unit.

[0069] Specifically, the desulfurization and denitrification flue gas purification device can use activated coke or other technologies to carry out desulfurization and denitrification purification treatment on the flue gas of the gas turbine unit. Using activated coke or other technologies by the desulfurization and denitrification flue gas purification device to treat the flue gas of the gas turbine unit can significantly reduce pollutant emissions and improve the cleanliness of energy utilization.

[0070] In an alternative embodiment, the system further includes: a carbon capture device. The flue gas input end of the carbon capture device is connected to the flue gas output end of the desulfurization and denitrification flue gas purification device. The carbon capture device is used for decarbonization treatment of the purified flue gas.

[0071] Specifically, the carbon capture efficiency design of the carbon capture device should meet the requirements of the capture efficiency. The generated CO2 is also equipped with some storage devices to meet the subsequent CO2 usage. The carbon capture device can use the amine method, solid adsorption method or other methods for CO2 capture. By carrying out decarbonization treatment on the flue gas, the carbon emissions of the gas turbine unit are further reduced.

[0072] In an alternative embodiment, the system further includes: a methanol preparation device, the first gas input end of the methanol preparation device is connected to the second gas output end of the hydrogen production device, and the second gas input end of the methanol preparation device is connected to the gas output end of the carbon capture device. The methanol preparation device is used to prepare industrial products from the produced hydrogen and captured carbon dioxide.

[0073] Specifically, the produced H2 and captured CO2 are used to prepare industrial products such as methanol by catalytic process technology. At the same time, if the demand for CO2 is strong, some of the CO2 can be sold externally. The excess H2 can also be sold externally or used for hydrogen blending combustion in existing gas turbine units to achieve low-carbon operation of the units. By preparing industrial products from the produced hydrogen and captured carbon dioxide, the by-products generated during the operation of the gas turbine units are converted into resources that can create economic value, thereby improving the overall economic efficiency.

[0074] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for deep peak shaving and low-carbon operation of a gas unit, characterized in that, The method includes: Receiving a peak shaving instruction and comparing the peak shaving instruction with the real-time operating load of the gas turbine unit; When the real-time operating load is greater than the peak shaving instruction, keeping the unit load unchanged, outputting the grid-connected power according to the peak shaving instruction, electrolyzing water to produce hydrogen with the surplus power of the gas turbine unit, and transporting the produced hydrogen back to the gas turbine unit for hydrogen-blended combustion of the gas turbine unit.

2. The method for deep peak shaving and low-carbon operation of a gas turbine unit according to claim 1, wherein, Electrolyzing water to produce hydrogen with the surplus power of the gas turbine unit and transporting the produced hydrogen back to the gas turbine unit for hydrogen-blended combustion of the gas turbine unit includes: Starting the AC-DC conversion device to convert the surplus power into direct current; Starting the hydrogen production device to electrolyze water to produce hydrogen with the surplus power; Transporting the produced hydrogen back to the gas turbine unit for hydrogen-blended combustion of the gas turbine unit.

3. The method for deep peak shaving and low-carbon operation of a gas turbine unit according to claim 2, characterized in that The method further includes: starting the desulfurization and denitrification flue gas purification device to perform desulfurization and denitrification purification treatment on the flue gas of the gas turbine unit.

4. The method for deep peak shaving and low-carbon operation of a gas turbine unit according to claim 3, characterized in that, The method further includes: starting the carbon capture device to perform decarbonization treatment on the purified flue gas.

5. The method for deep peak shaving and low-carbon operation of a gas turbine unit according to claim 4, wherein The method further includes: starting the methanol preparation device to prepare industrial products from the produced hydrogen and the captured carbon dioxide.

6. The method for deep peak shaving and low-carbon operation of a gas turbine unit according to claim 1, characterized in that The method further includes: when the real-time operating load is not greater than the peak shaving instruction, controlling the gas turbine unit to increase the load until the grid-connected power output by the gas turbine unit meets the peak shaving instruction.

7. A deep peak shaving and low-carbon operation system for a gas turbine unit, characterized in that, The system includes: a gas turbine unit, an AC-DC conversion device, and a hydrogen production device, where The instruction receiving end of the gas turbine unit receives the peak shaving instruction, the first power transmission end of the gas turbine unit is connected to the grid bus, the second power transmission end of the gas turbine unit is connected to the input end of the AC-DC conversion device, the output end of the AC-DC conversion device is connected to the power supply end of the hydrogen production device, and the first gas output end of the hydrogen production device is connected to the fuel input end of the gas turbine unit; The gas turbine unit receives the peak shaving instruction, compares the peak shaving instruction with its own real-time operating load. When the real-time operating load is greater than the peak shaving instruction, it keeps the unit load unchanged, outputs the grid-connected power according to the peak shaving instruction, and at the same time uses the AC-DC conversion device to convert the surplus power of the gas turbine unit into direct current, then transports the direct current to the hydrogen production device for electrolyzing water to produce hydrogen, and finally transports the produced hydrogen back to the gas turbine unit for hydrogen-blended combustion of the gas turbine unit.

8. The deep peak shaving and low-carbon operation system of a gas turbine unit according to claim 7, characterized in that, The system further includes: a desulfurization and denitrification flue gas purification device, the flue gas input end of the desulfurization and denitrification flue gas purification device is connected to the flue gas output end of the gas turbine unit, and the desulfurization and denitrification flue gas purification device is used to perform desulfurization and denitrification purification treatment on the flue gas of the gas turbine unit.

9. The deep peak shaving and low-carbon operation system of a gas turbine unit according to claim 8, characterized in that, The system further includes: a carbon capture device, the flue gas input end of the carbon capture device is connected to the flue gas output end of the desulfurization and denitrification flue gas purification device, and the carbon capture device is used to perform decarbonization treatment on the purified flue gas.

10. The deep peak shaving and low-carbon operation system of a gas turbine unit according to claim 9, characterized in that, The system further includes: a methanol preparation device, the first gas input end of the methanol preparation device is connected to the second gas output end of the hydrogen production device, the second gas input end of the methanol preparation device is connected to the gas output end of the carbon capture device, and the methanol preparation device is used to prepare industrial products from the produced hydrogen and the captured carbon dioxide.

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