A control method of a renewable energy driven electricity-heat-hydrogen-iron poly-generation system

Abstract

The application discloses a control method of an electric-thermal-hydrogen-iron poly-generation system driven by renewable energy, and the poly-generation system is composed of renewable energy power generation equipment, water electrolysis hydrogen production equipment, battery equipment and metallurgical equipment. The control method is divided into two parts: design value and real-time value calculation. In the design value calculation process, the design values of hydrogen production, reducing gas temperature and reducing gas proportion are obtained through the renewable energy characteristic curve, electrolytic cell characteristics and metallurgical quantity of the metallurgical equipment. In the real-time value calculation process, the real-time values of hydrogen production, reducing gas temperature and reducing gas proportion are obtained through the power generation fluctuation value, and the control methods of reducing gas proportion adjustment, reducing gas temperature and reducing gas proportion adjustment and battery mode switching are sequentially adopted. The application relieves the impact of renewable energy fluctuation on the poly-generation system through the layered calculation of design value and real-time value and the combined control of reducing gas and battery, and realizes the stable, safe and low-carbon operation of the poly-generation system.

Description

Technical Field

[0001] This invention belongs to the field of renewable energy utilization and control technology, specifically relating to a control method for a renewable energy-driven combined heat, power, hydrogen and iron system. Background Technology

[0002] The intermittent nature of renewable energy leads to fluctuations in power generation and hydrogen production, while metallurgical production is generally stable. How to use fluctuating "green hydrogen" to reduce stable "iron ore" has become a key technical bottleneck restricting the safe and stable operation of the power-heat-hydrogen-iron cogeneration system. Summary of the Invention

[0003] This invention addresses the problem of unstable operation caused by fluctuations in "green electricity" in combined heat, power, hydrogen, and iron (CHP) systems. Starting from the requirements of the total amount and temperature of reducing gas in the metallurgical system, it aims to propose a control method to ensure the stable operation of the CHP system. The purpose of this invention is to provide a control method for a renewable energy-driven CHP system. By adjusting the reducing gas temperature and ratio, and switching battery modes, it mitigates the impact of renewable energy fluctuations on the safe operation of the system, ensuring the stable operation of the CHP system and providing technical guidance for the large-scale consumption of renewable energy and low-carbon emissions in the metallurgical industry.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A control method for a renewable energy-driven combined heat, power, hydrogen, and iron (CHP) system is disclosed. The CHP system includes renewable energy power generation equipment, water electrolysis hydrogen production equipment, battery storage equipment, and metallurgical equipment. The control method consists of two parts: design value calculation and real-time value calculation. In the design value calculation, the predicted power generation of the renewable energy power generation equipment is obtained based on wind and solar characteristics. Based on the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment, the design value of hydrogen production is obtained based on the predicted power generation. Based on the metallurgical equipment, multiple sets of hydrogen quantity, reducing gas ratio, and reducing gas temperature are obtained through heat and material balance. The design values ​​of the reducing gas temperature and reducing gas ratio are determined based on the design value of hydrogen production. In the real-time value calculation, the change between the predicted and real-time power generation of the renewable energy power generation equipment is calculated, referred to as the power generation fluctuation value. After passing through speed limiting and amplitude limiting mechanisms, the real-time values ​​of the reducing gas ratio, reducing gas temperature, hydrogen production, and battery operating status are obtained, ensuring the stable and safe operation of the CHP system.

[0006] Furthermore, the connection method between the devices in the combined heat and power system is as follows: the electricity generated by the renewable energy power generation equipment is sent to the water electrolysis hydrogen production equipment to produce hydrogen. The hydrogen replaces part of the carbon monoxide as a reducing gas and is sent to the metallurgical equipment. After mixing with carbon monoxide, it is heated to form a high-temperature reducing gas to reduce iron ore and produce molten iron. When the battery equipment is in charging mode, it is connected to the renewable energy power generation equipment. When the battery equipment is in discharging mode, it is connected to the water electrolysis hydrogen production equipment.

[0007] Furthermore, the designed hydrogen production capacity is...

[0008] G s =g(P s )

[0009] Where: G s The design value for hydrogen production capacity of the water electrolysis hydrogen production equipment is given in kg / s; P s The predicted power generation of renewable energy power generation equipment is expressed in kW; g(P) s The formula is a fitting equation for the relationship between the amount of electricity and the amount of hydrogen produced, determined by the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment.

[0010] Furthermore, the reducing gas is composed of carbon monoxide and hydrogen produced in the water electrolysis hydrogen production equipment, and the reducing gas ratio is the proportion of hydrogen in the reducing gas.

[0011] Furthermore, the multiple sets of hydrogen quantities, reducing gas ratios, and reducing gas temperatures obtained based on the metallurgical quantity of the metallurgical equipment through heat balance and material balance are as follows:

[0012]

[0013] In the formula, L represents a combination of multiple hydrogen quantities, reducing gas ratios, and reducing gas temperatures; L i (T i The reducing gas temperature is T. i The combination of hydrogen quantity, reducing gas ratio, and reducing gas temperature at time T min This refers to the minimum reducing gas temperature in metallurgical equipment; T max G represents the maximum temperature of the reducing gas in the metallurgical equipment. i To reduce the gas temperature to T i The range of hydrogen quantities at that time; G i,min To reduce the gas temperature to T i The minimum amount of hydrogen at that time; G i,max To reduce the gas temperature to T i The maximum amount of hydrogen at that time; R i To reduce the gas temperature to T i The amount of hydrogen is G i The range of reducing gas ratios; R i,min To reduce the gas temperature to Ti The amount of hydrogen is G i The minimum value of the reducing gas ratio; R i,max To reduce the gas temperature to T i The amount of hydrogen is G i The maximum value of the reducing gas ratio.

[0014] Furthermore, the calculation methods for the design values ​​of the reducing gas temperature and the reducing gas ratio are as follows:

[0015] Based on the combination L of multiple sets of hydrogen quantity, reducing gas ratio, and reducing gas temperature, the required hydrogen range at multiple reducing gas temperatures is obtained. Take the midpoint of the hydrogen range The closest value to the design value of hydrogen production G s The reducing gas temperature T at that time i The design value T for the reducing gas temperature s The reducing gas ratio R at this time i The design value R is called the reducing gas ratio. s ;

[0016]

[0017] In the formula, To reduce the gas temperature to T i The minimum amount of hydrogen at that time; To reduce the gas temperature to T i The maximum amount of hydrogen at that time.

[0018] Furthermore, the method for calculating the fluctuation value of the power generation is as follows:

[0019] ΔP=P rt -P s

[0020] In the formula: ΔP is the fluctuation value of power generation, kW; P rt This is the real-time value of the power generated by renewable energy power generation equipment, expressed in kW.

[0021] Furthermore, the speed limiting mechanism functions as follows:

[0022] 1) Speed ​​limiting stage 1: |ΔP|≤P1

[0023] The design value T for the reducing gas temperature s Under the condition that the utilization rate of reducing gas is greater than 45%, the maximum and minimum values ​​of the proportion of reducing gas are obtained. When the change in hydrogen caused by the fluctuation value of power generation reaches the maximum or minimum value of the proportion of reducing gas, the fluctuation value of power generation at this time is recorded as P1.

[0024] When the fluctuation value of power generation ΔP is less than or equal to P1, the reducing gas ratio is adjusted. The real-time value of the reducing gas ratio is as follows:

[0025] R rt =R s +K p1 ·ΔP

[0026] In the formula: R rt R is the real-time value of the reducing gas ratio; s K is the design value for the reducing gas ratio. p1 A proportional controller can be selected to account for the changes in the reducing gas ratio caused by fluctuations in power generation.

[0027] 2) Speed ​​limiting stage 2: P1 < |ΔP| ≤ P2

[0028] At the maximum and minimum temperatures of the reducing gas, with the utilization rate of the reducing gas being greater than 45%, the maximum and minimum values ​​of the reducing gas ratio are obtained. When the change in hydrogen caused by the fluctuation in power generation reaches the maximum or minimum value of the reducing gas ratio, the fluctuation value of power generation at this time is recorded as P2.

[0029] When the fluctuation value of power generation ΔP is greater than P1 and less than or equal to P2, the reducing gas temperature and ratio are adjusted. The real-time values ​​of the reducing gas temperature and ratio are as follows:

[0030] T rt =T s +K p2 ·ΔP

[0031] R rt =R s +K p1 ·ΔP

[0032] In the formula: T rt T represents the real-time temperature of the reducing gas. s K is the design value for the reducing gas temperature. p2 To determine the relationship between the power generation fluctuations and the resulting reduction gas temperature changes, a proportional controller can be selected.

[0033] Furthermore, the workflow of the limiting step is as follows:

[0034] When the fluctuation value of power generation is greater than P2, the battery is in charging mode, and the power in the renewable energy power generation equipment is sent to the battery; when the fluctuation value of power generation is less than -P2, the battery is in discharging mode, and part of the power in the battery is sent to the water electrolysis hydrogen production equipment.

[0035] The calculation method for battery charging or discharging capacity is as follows:

[0036] ΔP x =P rt -P2

[0037] Where: ΔPx The charge or discharge capacity of a battery is expressed in kW.

[0038] Furthermore, the real-time value of the hydrogen production is calculated as follows:

[0039]

[0040] In the formula: The real-time value of hydrogen production is expressed in kg / s; ΔP x The charge or discharge capacity of a storage battery, expressed in kW; g(P) rt ) represents the fitted equation relating the real-time power generation of renewable energy power generation equipment to the real-time hydrogen production; g(P) rt +ΔP x () is a fitting formula for the relationship between the real-time value of the input electricity to the electrolyzer and the real-time value of the hydrogen production in the water electrolysis hydrogen production equipment.

[0041] Compared with the prior art, the advantages of the present invention are as follows:

[0042] (1) Combining the intermittent nature of renewable energy power generation equipment, a hierarchical calculation method is proposed based on the design value of renewable energy power generation forecast and the real-time value based on power generation fluctuation, which takes into account both the speed and accuracy of system regulation.

[0043] (2) A multi-level control method based on the speed and amplitude limiting link is proposed, such as "reducing gas ratio adjustment", "reducing gas temperature and ratio adjustment" and "battery mode switching", to achieve safe and stable operation of the multi-generation system. Attached Figure Description

[0044] Figure 1 This is a flowchart of the control method for a combined heat and power (CHP) system.

[0045] Figure 2 A schematic diagram of a combined heat, electricity, hydrogen, and iron power generation system driven by renewable energy. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0047] A control method for a renewable energy-driven combined heat, power, hydrogen, and iron (CHP) system, such as... Figure 2 As shown, the combined heat and power (CHP) system includes renewable energy power generation equipment, water electrolysis hydrogen production equipment, battery storage equipment, and metallurgical equipment; such as Figure 1As shown, the control method of the combined heat and power (CHP) system is divided into two parts: design value calculation and real-time value calculation. In the design value calculation process, the predicted value of the power generation of the renewable energy power generation equipment is obtained based on the characteristics of wind and solar power. Based on the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment, the design value of the hydrogen production is obtained based on the predicted value of the power generation of the renewable energy power generation equipment. Based on the metallurgical quantity of the metallurgical equipment, multiple sets of hydrogen quantity, reducing gas ratio, and reducing gas temperature are obtained through heat balance and material balance. The design values ​​of the reducing gas temperature and reducing gas ratio are determined based on the design value of the hydrogen production. In the real-time value calculation process, the change between the predicted value and the real-time value of the power generation of the renewable energy power generation equipment is calculated, which is called the power generation fluctuation value. After passing through the speed limiting and amplitude limiting links, the real-time values ​​of the reducing gas ratio, reducing gas temperature, hydrogen production, and battery operating status are obtained, thus completing the stable and safe operation of the CHP system.

[0048] like Figure 2 As shown, the connection method between the devices in the combined heat and power system is as follows: the electricity generated by the renewable energy power generation equipment is sent to the water electrolysis hydrogen production equipment to produce hydrogen. The hydrogen replaces part of the carbon monoxide as a reducing gas and is sent to the metallurgical equipment. After mixing with carbon monoxide, it is heated to form a high-temperature reducing gas to reduce iron ore and produce molten iron. When the battery equipment is in charging mode, it is connected to the renewable energy power generation equipment and stores the electricity generated by the renewable energy power generation equipment in the battery equipment. When the battery equipment is in discharging mode, it is connected to the water electrolysis hydrogen production equipment and supplies power to the water electrolysis hydrogen production equipment from the battery equipment.

[0049] The designed hydrogen production capacity is [value missing].

[0050] G s =g(P s )

[0051] Where: G s The design value for hydrogen production capacity of the water electrolysis hydrogen production equipment is given in kg / s; P s The predicted power generation of renewable energy power generation equipment is expressed in kW; g(P) s The formula is a fitting equation for the relationship between the amount of electricity and the amount of hydrogen produced, determined by the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment.

[0052] The reducing gas consists of carbon monoxide and hydrogen produced in the water electrolysis hydrogen production equipment, and the reducing gas ratio is the proportion of hydrogen in the reducing gas.

[0053] The following are multiple sets of hydrogen quantities, reducing gas ratios, and reducing gas temperatures obtained based on the metallurgical quantity of the metallurgical equipment through heat and material balance:

[0054]

[0055] In the formula, L represents a combination of multiple hydrogen quantities, reducing gas ratios, and reducing gas temperatures; L i (T i The reducing gas temperature is T. i The combination of hydrogen quantity, reducing gas ratio, and reducing gas temperature at time T min This refers to the minimum reducing gas temperature in metallurgical equipment; T max G represents the maximum temperature of the reducing gas in the metallurgical equipment. i To reduce the gas temperature to T i The range of hydrogen quantities at that time; G i,min To reduce the gas temperature to T i The minimum amount of hydrogen at that time; G i,max To reduce the gas temperature to T i The maximum amount of hydrogen at that time; R i To reduce the gas temperature to T i The amount of hydrogen is G i The range of reducing gas ratios; R i,min To reduce the gas temperature to T i The amount of hydrogen is G i The minimum value of the reducing gas ratio; R i,max To reduce the gas temperature to T i The amount of hydrogen is G i The maximum value of the reducing gas ratio.

[0056] The calculation methods for the design values ​​of the reducing gas temperature and the reducing gas ratio are as follows:

[0057] Based on the combination L of multiple sets of hydrogen quantity, reducing gas ratio, and reducing gas temperature, the required hydrogen range at multiple reducing gas temperatures is obtained. Take the midpoint of the hydrogen range The closest value to the design value of hydrogen production G s The reducing gas temperature T at that time i The design value T for the reducing gas temperature s The reducing gas ratio R at this time i The design value R is called the reducing gas ratio. s .

[0058]

[0059] In the formula, To reduce the gas temperature to T i The minimum amount of hydrogen at that time; To reduce the gas temperature to T i The maximum amount of hydrogen at that time.

[0060] The method for calculating the fluctuation value of power generation is as follows:

[0061] ΔP=P rt-P s

[0062] In the formula: ΔP is the fluctuation value of power generation, kW; P rt This is the real-time value of the power generated by renewable energy power generation equipment, expressed in kW.

[0063] The speed limiting mechanism serves the following functions:

[0064] 1) Speed ​​limiting stage 1: |ΔP|≤P1

[0065] The design value T for the reducing gas temperature s Under the condition that the utilization rate of reducing gas is greater than 45%, the maximum and minimum values ​​of the proportion of reducing gas are obtained. When the change in hydrogen caused by the fluctuation value of power generation reaches the maximum or minimum value of the proportion of reducing gas, the fluctuation value of power generation at this time is recorded as P1.

[0066] When the fluctuation value of power generation ΔP is less than or equal to P1, the reducing gas ratio is adjusted. The real-time value of the reducing gas ratio is as follows:

[0067] R rt =R s +K p1 ·ΔP

[0068] In the formula: R rt R is the real-time value of the reducing gas ratio; s K is the design value for the reducing gas ratio. p1 A proportional controller can be selected to account for the changes in the reducing gas ratio caused by fluctuations in power generation.

[0069] 2) Speed ​​limiting stage 2: P1 < |ΔP| ≤ P2

[0070] At the maximum and minimum temperatures of the reducing gas, with the utilization rate of the reducing gas being greater than 45%, the maximum and minimum values ​​of the reducing gas ratio are obtained. When the change in hydrogen caused by the fluctuation in power generation reaches the maximum or minimum value of the reducing gas ratio, the fluctuation value of power generation at this time is recorded as P2.

[0071] When the power generation fluctuation ΔP is greater than P1 and less than or equal to P2, the reducing gas temperature and ratio are adjusted. The real-time values ​​of the reducing gas temperature and ratio are as follows:

[0072] T rt =T s +K p2 ·ΔP

[0073] R rt =R s +K p1 ·ΔP

[0074] In the formula: T rtT represents the real-time temperature of the reducing gas. s K is the design value for the reducing gas temperature. p2 To determine the relationship between the power generation fluctuations and the resulting reduction gas temperature changes, a proportional controller can be selected.

[0075] The workflow of the limiting process is as follows.

[0076] When the fluctuation value of power generation is greater than P2, the battery is in charging mode, and the power from the renewable energy power generation equipment is sent to the battery; when the fluctuation value of power generation is less than -P2, the battery is in discharging mode, and part of the power in the battery is sent to the water electrolysis hydrogen production equipment.

[0077] The calculation method for battery charging or discharging capacity is as follows:

[0078] ΔP x =P rt -P2

[0079] Where: ΔP x The charge or discharge capacity of a battery is expressed in kW.

[0080] The real-time value of hydrogen production is calculated as follows.

[0081]

[0082] Where: G H2,rt The real-time value of hydrogen production is expressed in kg / s; ΔP x The charge or discharge capacity of a storage battery, expressed in kW; g(P) rt ) represents the fitted equation relating the real-time power generation of renewable energy power generation equipment to the real-time hydrogen production; g(P) rt +ΔP x () is a fitting formula for the relationship between the real-time value of the input electricity to the electrolyzer and the real-time value of the hydrogen production in the water electrolysis hydrogen production equipment.

[0083] This invention mitigates the impact of renewable energy fluctuations on the combined heat and power (CHP) system by using hierarchical calculation of design and real-time values ​​and joint regulation of reducing gas and batteries, thereby achieving stable, safe and low-carbon operation of the CHP system.

Claims

1. A control method for a renewable energy-driven combined heat, power, hydrogen, and iron production system, characterized in that: Combined power generation systems include renewable energy power generation equipment, water electrolysis hydrogen production equipment, battery storage equipment, and metallurgical equipment; The control method for the combined heat and power (CHP) system consists of two parts: design value calculation and real-time value calculation. In the design value calculation process, the predicted power generation of the renewable energy power generation equipment is obtained based on the characteristics of wind and solar power. Based on the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment, the design value of hydrogen production is obtained based on the predicted power generation of the renewable energy power generation equipment. Based on the metallurgical equipment, multiple sets of hydrogen quantity, reducing gas ratio, and reducing gas temperature are obtained through heat and material balance. The design values ​​of the reducing gas temperature and reducing gas ratio are determined based on the design value of hydrogen production. In the real-time value calculation process, the change between the predicted and real-time power generation of the renewable energy power generation equipment is calculated, referred to as the power generation fluctuation value. After passing through speed limiting and amplitude limiting links, the real-time values ​​of the reducing gas ratio, reducing gas temperature, hydrogen production, and the battery operating status are obtained, thus ensuring the stable and safe operation of the CHP system. The speed limiting mechanism serves the following functions: 1) Speed ​​limiting stage 1: |ΔP|≤P1 The design value T for the reducing gas temperature s Under the condition that the utilization rate of reducing gas is greater than 45%, the maximum and minimum values ​​of the proportion of reducing gas are obtained. When the change in hydrogen caused by the fluctuation value of power generation reaches the maximum or minimum value of the proportion of reducing gas, the fluctuation value of power generation at this time is recorded as P1. When the fluctuation value of power generation ΔP is less than or equal to P1, the reducing gas ratio is adjusted. The real-time value of the reducing gas ratio is as follows: R rt =R s +K p1 ·ΔP In the formula: R rt R is the real-time value of the reducing gas ratio; s K is the design value for the reducing gas ratio. p1 A proportional controller is selected based on the relationship between the change in the proportion of reducing gas caused by fluctuations in power generation. 2) Speed ​​limiting stage 2: P1 < |ΔP| ≤ P2 At the maximum and minimum temperatures of the reducing gas, with the utilization rate of the reducing gas being greater than 45%, the maximum and minimum values ​​of the reducing gas ratio are obtained. When the change in hydrogen caused by the fluctuation in power generation reaches the maximum or minimum value of the reducing gas ratio, the fluctuation value of power generation at this time is recorded as P2. When the power generation fluctuation ΔP is greater than P1 and less than or equal to P2, the reducing gas temperature and ratio are adjusted. The real-time values ​​of the reducing gas temperature and ratio are as follows: T rt =T s +K p2 ·ΔP R rt =R s +K p1 ·ΔP In the formula: T rt T represents the real-time temperature of the reducing gas. s K is the design value for the reducing gas temperature. p2 A proportional controller is selected based on the relationship between the power generation fluctuation and the reducing gas temperature change. The workflow of the limiting process is as follows. When the fluctuation value of power generation is greater than P2, the battery is in charging mode, and the power in the renewable energy power generation equipment is sent to the battery; when the fluctuation value of power generation is less than -P2, the battery is in discharging mode, and part of the power in the battery is sent to the water electrolysis hydrogen production equipment. The calculation method for battery charging or discharging capacity is as follows: ΔP x =P rt -P2 Where: ΔP x The charge or discharge capacity of a battery is expressed in kW.

2. The control method for a renewable energy-driven combined heat, power, hydrogen, and iron production system according to claim 1, characterized in that: The connection method between the devices in the combined heat and power system is as follows: the electricity generated by the renewable energy power generation equipment is sent to the water electrolysis hydrogen production equipment to produce hydrogen. The hydrogen replaces part of the carbon monoxide as a reducing gas and is sent to the metallurgical equipment. After mixing with carbon monoxide, it is heated to form a high-temperature reducing gas to reduce iron ore and produce molten iron. When the battery equipment is in charging mode, it is connected to the renewable energy power generation equipment. When the battery equipment is in discharging mode, it is connected to the water electrolysis hydrogen production equipment.

3. The control method for a renewable energy-driven combined heat, power, hydrogen, and iron production system according to claim 1, characterized in that: The designed hydrogen production capacity is [value missing]. G s =g(P s ) Where: G s The design value for hydrogen production capacity of the water electrolysis hydrogen production equipment is given in kg / s; P s The predicted power generation of renewable energy power generation equipment is expressed in kW; g(P) s The formula is a fitting equation for the relationship between the amount of electricity and the amount of hydrogen produced, determined by the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment.

4. The control method for a renewable energy-driven combined heat, power, hydrogen, and iron production system according to claim 1, characterized in that: The reducing gas consists of carbon monoxide and hydrogen produced in a water electrolysis hydrogen production device.

5. The control method for a renewable energy-driven combined heat, power, hydrogen, and iron production system according to claim 1, characterized in that: The reducing gas ratio refers to the proportion of hydrogen in the reducing gas.

6. The control method for a renewable energy-driven combined heat, power, hydrogen, and iron production system according to claim 1, characterized in that: The following are multiple sets of hydrogen quantities, reducing gas ratios, and reducing gas temperatures obtained based on the metallurgical quantity of the metallurgical equipment through heat and material balance: In the formula, L represents a combination of multiple hydrogen quantities, reducing gas ratios, and reducing gas temperatures; L i (T i The reducing gas temperature is T. i The combination of hydrogen quantity, reducing gas ratio, and reducing gas temperature at time T min This represents the minimum temperature of the reducing gas in metallurgical equipment. T max G represents the maximum temperature of the reducing gas in the metallurgical equipment. i To reduce the gas temperature to T i The range of hydrogen quantities at that time; G i,min To reduce the gas temperature to T i The minimum amount of hydrogen at that time; G i,max To reduce the gas temperature to T i The maximum amount of hydrogen at that time; R i To reduce the gas temperature to T i The amount of hydrogen is G i The range of reducing gas ratios; R i,min To reduce the gas temperature to T i The amount of hydrogen is G i The minimum value of the reducing gas ratio; R i,max To reduce the gas temperature to T i The amount of hydrogen is G i The maximum value of the reducing gas ratio.

7. The control method for a renewable energy-driven combined heat, power, hydrogen, and iron production system according to claim 1, characterized in that: The calculation methods for the design values ​​of the reducing gas temperature and the reducing gas ratio are as follows: Based on the combination L of multiple sets of hydrogen quantity, reducing gas ratio, and reducing gas temperature, the required hydrogen range at multiple reducing gas temperatures is obtained. Take the midpoint of the hydrogen range The closest value to the design value of hydrogen production G s The reducing gas temperature T at that time i The design value T for the reducing gas temperature s The reducing gas ratio R at this time i The design value R is called the reducing gas ratio. s ; In the formula, To reduce the gas temperature to T i The minimum amount of hydrogen at that time; To reduce the gas temperature to T i The maximum amount of hydrogen at that time.

8. The control method for a renewable energy-driven combined heat, power, hydrogen, and iron production system according to claim 1, characterized in that: The method for calculating the fluctuation value of power generation is as follows: ΔP=P rt -P s In the formula: ΔP is the fluctuation value of power generation, kW; P rt The real-time value of power generation from renewable energy power generation equipment, in kW; P s This is the predicted power generation of renewable energy power generation equipment, in kW.

9. The control method for a renewable energy-driven combined heat, power, hydrogen, and iron production system according to claim 1, characterized in that: The real-time value of hydrogen production is calculated as follows. In the formula: The real-time value of hydrogen production is expressed in kg / s; ΔP x The charge or discharge capacity of a storage battery, expressed in kW; g(P) rt ) represents the fitted equation relating the real-time power generation of renewable energy power generation equipment to the real-time hydrogen production; g(P) rt +ΔP x () is a fitting formula for the relationship between the real-time value of the input electricity to the electrolyzer and the real-time value of the hydrogen production in the water electrolysis hydrogen production equipment.

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