Blast furnace gas molten salt heat storage scheduling and utilization system and method

Abstract

The invention relates to the technical field of fused salt heat storage scheduling, and discloses a blast furnace gas fused salt heat storage scheduling and utilization system and method.The blast furnace gas fused salt heat storage scheduling and utilization system comprises a blast furnace gas collection and allocation module, a fused salt combustion heating module, a fused salt heat storage tank module, a steam generation module and a scheduling optimization module. According to the method, the waste gas amount is minimized as a scheduling optimization criterion, the economical efficiency of coal gas resource utilization is enhanced, the diffusion rate is reduced, meanwhile, indirect improvement of the steam productivity is considered, and coordination and unification of multiple targets are achieved.

Description

Technical Field

[0001] This invention relates to the field of molten salt thermal storage and scheduling technology, specifically to a system and method for scheduling and utilizing molten salt thermal storage of blast furnace gas. Background Technology

[0002] In modern steel production processes, blast furnace gas, as a typical by-product gas, has become an important source of energy recovery due to its considerable calorific value and stable supply. However, due to fluctuations in production conditions, its production process is unstable, often resulting in a significant mismatch between gas supply and demand, making it difficult to achieve "production and demand synchronization." The traditional "produce and use as needed" model can no longer adapt to the dynamic changes in actual load.

[0003] To alleviate this contradiction, some steel companies have introduced thermal storage mechanisms (such as molten salt thermal storage systems) to temporarily store the calorific value of coal gas as thermal energy for subsequent steam supply or power generation. However, due to the highly sensitive physical characteristics of molten salt thermal storage media to system start-up and shutdown, they face the following engineering challenges in actual operation:

[0004] System start-up and shutdown can easily lead to molten salt crystallization, pipe blockage, and heat exchanger scaling, which seriously affects equipment life and operational safety.

[0005] Frequent start-stop cycles lead to energy waste and increased restart load, resulting in a decrease in overall efficiency.

[0006] Most existing scheduling systems lack modeling support for equipment safety conditions, focusing solely on economic efficiency while ignoring engineering constraints, making it difficult to implement the models.

[0007] Therefore, constructing a system solution that can ensure the continuous operation of molten salt thermal storage systems, possess engineering safety control logic, and integrate energy dynamic scheduling and optimization capabilities has become an urgent technical requirement for the steel industry to achieve efficient conversion of coal gas resources. Summary of the Invention

[0008] In view of this, the present invention provides a blast furnace gas molten salt thermal storage scheduling and utilization system and method to solve the problem of how to achieve dynamic scheduling and maximum calorific value conversion and utilization of blast furnace gas.

[0009] In a first aspect, the present invention provides a blast furnace gas molten salt thermal storage scheduling and utilization system, comprising: a blast furnace gas acquisition and distribution module, a molten salt combustion heating module, a molten salt thermal storage tank module, a steam generation module, and a scheduling optimization module. The blast furnace gas acquisition and distribution module is connected to the scheduling optimization module and is used to acquire the gas produced by the blast furnace in the steel plant in real time, and based on the control commands of the scheduling optimization module, to distribute the gas to a direct utilization path, or to distribute the gas to a molten salt combustion furnace through a molten salt thermal storage path. The molten salt combustion heating module is used to heat the molten salt medium using the gas as fuel. The molten salt thermal storage tank module is connected to a steam generator and is used to store high-temperature molten salt. The steam generation module is used to release heat energy from the molten salt tank to heat water and generate steam when gas is insufficient; the steam is used for power generation or industrial load heating. The scheduling optimization module is used to achieve optimal scheduling of dynamic gas distribution and thermal energy utilization efficiency.

[0010] In one alternative implementation, the scheduling optimization module is deployed on MATLAB or an equivalent industrial scheduling platform.

[0011] Secondly, the present invention provides a method for scheduling and utilizing blast furnace gas molten salt thermal storage. The method is applied to the scheduling optimization module of the blast furnace gas molten salt thermal storage scheduling and utilization system in the first aspect and any optional embodiment thereof. The method includes: predicting the blast furnace gas output at the current moment; establishing an objective function based on the amount of gas released and wasted; establishing a gas conservation equation regarding the predicted blast furnace gas output at the current moment, the amount of gas directly utilized, the amount of gas released and wasted, and the amount of gas entering the molten salt combustion heating module; and dynamically optimizing the gas conservation equation using multiple constraints and the objective function to obtain the amount of gas directly utilized and the amount of gas entering the molten salt combustion heating module at the current moment.

[0012] In one alternative implementation, the objective function is:

[0013]

[0014] Where, x loss (t) represents the amount of gas wasted; T represents the scheduling cycle.

[0015] In one alternative implementation, the constraints include: the amount of gas entering the molten salt combustion heating module at the current moment is greater than or equal to the minimum gas input flow rate required by the molten salt combustion heating module, and the amount of gas entering the molten salt combustion heating module at the current moment is less than or equal to the maximum safe gas input flow rate that the molten salt combustion heating module can withstand.

[0016] In one optional implementation, the constraints further include: the steam flow rate output by the steam generating module at the current moment is greater than or equal to the minimum output steam amount required for safe heat exchange of the steam generating module, and the steam flow rate output by the steam generating module at the current moment is less than or equal to the upper limit of steam output allowed by the maximum heat exchange capacity of the steam generating module.

[0017] In one alternative implementation, the constraints further include: the thermal state of the molten salt in the molten salt storage tank module at the current moment is greater than or equal to the minimum allowable heat value, and the thermal state of the molten salt in the molten salt storage tank module at the current moment is less than or equal to the heat capacity limit.

[0018] In one optional implementation, the formula for calculating the thermal state of the molten salt in the molten salt storage tank module at the current moment is as follows:

[0019] h s (t)=h s (t-1)+r1·xg(t)-r2·q steam (t)

[0020] Among them, h s (t) represents the thermal state of the molten salt in the molten salt storage tank module at the current moment; h s (t-1) represents the thermal state of the molten salt in the molten salt storage tank module at the previous moment; r1 is the thermal energy conversion coefficient corresponding to a unit gas input flow rate; r2 is the molten salt thermal energy consumption coefficient required for a unit steam output; x g (t) represents the flow rate entering the molten salt thermal storage tank module at the current moment; q steam (t) represents the steam output at the current moment.

[0021] Thirdly, the present invention provides a computer device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the blast furnace gas molten salt thermal storage scheduling and utilization method described in the second aspect or any corresponding embodiment thereof.

[0022] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the blast furnace gas molten salt thermal storage scheduling and utilization method described in the second aspect or any of the corresponding embodiments.

[0023] Fifthly, the present invention provides a computer program product, including computer instructions, which are used to cause a computer to execute the blast furnace gas molten salt thermal storage scheduling and utilization method of the second aspect or any corresponding embodiment described above.

[0024] This application aims to maximize the utilization of blast furnace gas calorific value. By minimizing the amount of "wasted gas" as the scheduling optimization criterion, it enhances the economic efficiency of gas resource utilization, reduces the venting rate, and also takes into account the indirect improvement of steam production capacity, thus achieving the coordinated unity of multiple objectives. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a diagram illustrating the composition of a blast furnace gas molten salt thermal storage scheduling and utilization system according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic flowchart of the blast furnace gas molten salt thermal storage scheduling and utilization method according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This embodiment provides a blast furnace gas molten salt thermal storage scheduling and utilization system, such as Figure 1 As shown, it includes: a blast furnace gas acquisition and distribution module, a molten salt combustion heating module, a molten salt thermal storage tank module, a steam generation module, and a scheduling optimization module. Through the coordinated operation of multiple modules, dynamic storage and efficient cascade utilization of blast furnace gas energy are achieved, significantly improving the stability and economy of the steel plant's energy system.

[0031] refer to Figure 1 The blast furnace gas acquisition and allocation module is connected to the scheduling optimization module. It is used to acquire the gas produced by the blast furnace of the steel plant in real time, and based on the control commands of the scheduling optimization module, allocate the gas to the direct utilization path, or allocate the gas to the molten salt combustion furnace through the molten salt heat storage path.

[0032] Specifically, the blast furnace gas acquisition and distribution module, acting as the system's "energy entry and distribution hub," is connected to the main blast furnace gas pipeline on one end and to both the direct utilization path (such as existing gas equipment in the steel plant) and the molten salt thermal storage path (molten salt combustion furnace) on the other. It communicates in real-time with the scheduling and optimization module via an industrial bus. Its core functions include two parts:

[0033] (1) By deploying intelligent sensing units (such as high-temperature gas flow meters, pressure transmitters, and online gas composition analyzers) on gas pipelines, the instantaneous output, pressure, temperature and core components of blast furnace gas are continuously monitored to ensure accurate capture of gas characteristics.

[0034] (2) Based on the dynamic control commands issued by the scheduling optimization module, the gas diversion and flow control are realized through the electric regulating valve group. When the gas production is sufficient (higher than the immediate demand of the steel plant), the module will transport the surplus gas to the molten salt combustion furnace through the molten salt thermal storage path; when the gas production is insufficient or it is necessary to prioritize the direct users (such as steel rolling heating furnace), the gas will be preferentially allocated to the direct utilization path. At the same time, the pipeline pressure can be stabilized through the pressure compensation device to avoid the operation of downstream equipment due to flow fluctuations.

[0035] refer to Figure 1 The molten salt combustion heating module is used to heat the molten salt medium using blast furnace gas as fuel. Specifically, the molten salt combustion heating module is the "core of thermal energy conversion" of the system, using blast furnace gas as the sole fuel, and undertakes the key task of converting chemical energy into molten salt thermal energy.

[0036] refer to Figure 1 The molten salt thermal storage tank module, connected to the steam generator, is used to store high-temperature molten salt. As the system's "thermal energy bank," the molten salt thermal storage tank module forms a closed-loop cycle with the molten salt combustion heating module and the steam generation module via insulated pipes.

[0037] refer to Figure 1 The steam generation module is used to release heat energy from the molten salt tank to heat water and generate steam when there is insufficient gas. The steam is then used for power generation or industrial load heating. Specifically, the steam generation module is the system's "heat energy release and secondary utilization terminal," mainly activated during periods of insufficient blast furnace gas supply (such as blast furnace shutdown or a sharp drop in gas production) or peak steam demand, playing a "supplementary energy" role.

[0038] refer to Figure 1The scheduling optimization module is used to achieve optimal scheduling of dynamic gas allocation and thermal energy utilization efficiency. Specifically, the scheduling optimization module receives multiple parameters in real time from the blast furnace gas acquisition module (output, composition), molten salt heat storage tank module (liquid level, temperature), steam generation module (steam demand, load fluctuations), and external environment (such as grid electricity price, industrial load period curves), etc., to build a system operation status database; dynamically calculates the allocation ratio of gas in the direct utilization path and molten salt heat storage path, converts the optimization results into specific control commands (such as valve opening, pump frequency, burner load), and sends them to each execution module through the industrial control system, and monitors the execution effect of the commands in real time. When deviations occur, the parameters are corrected to achieve full closed-loop scheduling and ensure that the system is always in the optimal operating state.

[0039] In some alternative implementations, the scheduling optimization module is deployed on MATLAB or an equivalent industrial scheduling platform.

[0040] Specifically, the scheduling optimization module, as the "intelligent decision-making hub" of the system, needs to meet the industrial-grade real-time and reliability requirements of its core algorithm and operating environment. Therefore, it is deployed in MATLAB or an equivalent industrial scheduling platform (such as Siemens TIAPortal, Rockwell FactoryTalk Analytics, etc.) to form a hardware and software collaborative decision-making system.

[0041] According to an embodiment of the present invention, a method for scheduling and utilizing blast furnace gas molten salt thermal storage is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0042] This embodiment provides a method for scheduling and utilizing blast furnace gas molten salt thermal storage. The method is applied to the scheduling optimization module of the above-mentioned blast furnace gas molten salt thermal storage scheduling and utilization system, such as... Figure 2 As shown, the method includes:

[0043] Step S1: Predict the blast furnace gas output at the current moment.

[0044] Specifically, the current blast furnace gas production forecast is the core prerequisite for the precise control of the entire dispatching system, and its accuracy directly determines the rationality of the subsequent gas allocation plan. Optionally, this forecasting process is not a simple output of a single model, but rather a dynamic forecasting system integrating "data-model-correction" to achieve real-time perception and forward-looking prediction of gas production through multi-dimensional technical means.

[0045] If the predicted value of blast furnace gas production at the current moment is Q gas (t) is greater than the load demand value Qdemand If the excess gas is used for molten salt heating, and the predicted blast furnace gas output Q at the current moment is... gas (t) is less than the load demand value Q demand This triggers heat release compensation from the molten salt thermal storage module.

[0046] Specifically, when the predicted blast furnace gas production exceeds the current total load demand, the system determines it to be in an "energy surplus state." At this time, the surplus gas (ΔQ = Q) needs to be released into the system. gas (t)-Q demand The gas is transported through dedicated pipelines to the molten salt combustion heating module, where it is converted into thermal energy and stored in the molten salt thermal storage tank. The entire process requires coordinated control of "precise allocation, efficient conversion, and safe storage." When the predicted output of blast furnace gas cannot meet the current load demand, the system determines it to be in an "energy shortage state." At this time, the heat release process of the molten salt thermal storage tank module needs to be activated. Steam is generated through heat exchange between high-temperature molten salt and water to make up for the energy gap (ΔQ' = Q). demand -Q gas (t)), the entire process needs to achieve dynamic regulation of "heat release on demand, precise energy replenishment, and load coordination".

[0047] Step S2: Establish an objective function based on the amount of gas wasted.

[0048] Optionally, the objective function is:

[0049]

[0050] Where, x loss (t) represents the amount of gas wasted; T represents the scheduling cycle; t represents the scheduling time index, usually in hours.

[0051] Specifically, the objective function is set to minimize the inefficiently utilized gas flow, i.e., to release wasted gas, thereby maximizing the molten salt heat absorption and steam output efficiency. When x loss When (t) decreases, more gas is directed to the molten salt combustion furnace, and the furnace heat load tends to stabilize (avoiding heat loss caused by frequent start-ups and shutdowns), making the molten salt heating process closer to the design conditions.

[0052] Step S3: Establish the gas conservation equation for the predicted current blast furnace gas production, the amount of gas directly utilized, the amount of gas released and wasted, and the amount of gas entering the molten salt combustion heating module.

[0053] Specifically, the gas conservation equation is the mathematical foundation describing the balance relationship between "production-distribution-consumption." It is necessary to clearly define the physical meaning of each variable and the boundary conditions to ensure the rigor of the equation. Specifically:

[0054] xg(t)+x direct (t)+xloss (t)=Qgas(t)(2)

[0055] Where, x g (t) represents the amount of gas entering the molten salt combustion heating module; x direct (t) represents the amount of gas directly utilized; Q gas (t) represents the predicted blast furnace gas output at the current moment.

[0056] Step S4: Using multiple constraints and objective functions, dynamically optimize the gas conservation equation to obtain the amount of gas directly used at the current moment and the amount of gas entering the molten salt combustion heating module.

[0057] Specifically, dynamically optimizing the gas conservation equation using multiple constraints and objective functions is the core step in achieving precise gas allocation. This process is not a simple mathematical solution, but rather involves constructing a closed-loop system of "constraints - objective function - algorithm iteration" to find the optimal combination of the amount of gas directly utilized at the current moment and the amount of gas entering the molten salt combustion heating module, while meeting the actual constraints of the industrial scenario.

[0058] Optionally, this embodiment uses a scheduling optimization model based on Mixed Integer Linear Programming (MILP) constructed in steps S1-S4. This model transforms the engineering characteristics of the molten salt system, such as its inability to start / stop, safe load range, and dynamic state of thermal storage, into mathematical constraints, serving as the basis for the scheduling logic. Unlike traditional scheduling methods that focus on minimizing operating costs or economic indicators such as electricity and coal prices as core optimization objectives, this embodiment prioritizes system safety and stability. It constructs the model based on engineering operational constraints, optimizing and improving thermal energy conversion efficiency while ensuring stable equipment operation. This method is suitable for process industry sites with drastic fluctuations in by-product gas and high requirements for the operating conditions of the thermal storage system.

[0059] The design possesses excellent engineering adaptability and practical application value.

[0060] In some alternative implementations, once the molten salt thermal storage system is started, it is required to run continuously throughout the scheduling cycle and cannot be started or stopped. Therefore, state variables are introduced:

[0061]

[0062] Where st represents the operating state of the molten salt thermal storage system at time t. st is always 1, which means that it runs continuously within the scheduling cycle to prevent problems such as molten salt crystallization and system scaling.

[0063] Specifically, when molten salt systems operate at high temperatures (550–580°C), they are highly susceptible to crystallization due to a sudden drop in temperature once flow or heating ceases, leading to the following engineering problems:

[0064] (1) Rapid scaling on the surface of the heat exchanger reduces heat exchange efficiency;

[0065] (2) The pump pipe is blocked, which affects the system restart;

[0066] (3) Molten salt crystallization expansion causes damage to the equipment structure;

[0067] (4) Restarting requires a lot of electric heating to remelt, which is time-consuming and energy-intensive.

[0068] Therefore, to ensure system safety and thermal efficiency, the molten salt system must be maintained in continuous operation, and short-term start-stop operations are not permitted. The optimized scheduling logic in this embodiment constructs the objective function and allocation strategy around the "start-stop prohibited" condition, fundamentally avoiding inefficient operation or thermal failures, thus demonstrating the essential difference between this embodiment and traditional scheduling strategies.

[0069] In some optional implementations, the boundary limit on the amount of gas entering the molten salt combustion heating module in the constraints is a core technical indicator to ensure the safe and stable operation of the module. Essentially, it avoids risks such as unstable combustion due to excessively low flow rates or overpressure and overheating due to excessively high flow rates by defining upper and lower thresholds for the gas input flow rate. The constraints include: the amount of gas entering the molten salt combustion heating module at the current moment is greater than or equal to the minimum gas input flow rate required by the molten salt combustion heating module, and the amount of gas entering the molten salt combustion heating module at the current moment is less than or equal to the maximum safe gas input flow rate that the molten salt combustion heating module can withstand. The specific expressions for the constraints are as follows:

[0070] x min ≤xg(t)≤x max (3)

[0071] Where, x min The minimum gas input flow rate required for the molten salt combustion heating module; x max This is the maximum safe gas input flow rate that the molten salt combustion heating module can withstand.

[0072] In some optional implementations, the boundary limits on the steam flow rate output by the steam generating module in the constraints are key technical specifications for ensuring safe heat exchange and efficient thermal energy conversion of the module. The core is to avoid uneven heat exchange due to excessively low flow rates or exceeding the heat exchange capacity of the equipment by clearly defining the upper and lower limits of the steam output flow rate. Specific constraint details are as follows: The constraints also include: the steam flow rate output by the steam generating module at the current moment is greater than or equal to the minimum output steam quantity required for safe heat exchange by the steam generating module, and the steam flow rate output by the steam generating module at the current moment is less than or equal to the upper limit of steam output allowed by the maximum heat exchange capacity of the steam generating module.

[0073] In some optional implementations, the boundary limits regarding the thermal state of the molten salt in the molten salt storage tank module are core principles for ensuring the safe heat storage, stable heat release, and extended equipment life of the thermal storage system. The key is to clearly define the upper and lower limits of the thermal state to avoid insufficient heat release capacity due to excessively low heat or excessively high heat exceeding the tank's capacity limit. Specific constraint details are as follows: the thermal state of the molten salt in the molten salt storage tank module at the current moment is greater than or equal to the minimum allowable heat value, and the thermal state of the molten salt in the molten salt storage tank module at the current moment is less than or equal to the heat capacity limit. The specific expression for the constraint is as follows:

[0074] h min ≤h s (t)≤h max (4)

[0075] Among them, h s (t) represents the steam output at the current moment; h min The minimum allowable caloric value; h max This is the heat capacity limit.

[0076] In some alternative implementations, the formula for calculating the thermal state of the molten salt in the molten salt storage tank module at the current moment is as follows:

[0077] h s (t)=h s (t-1)+r1·xg(t)-r2·q steam (t)(5)

[0078] Among them, h s (t) represents the thermal state of the molten salt in the molten salt storage tank module at the current moment; h s (t-1) represents the thermal state of the molten salt in the molten salt storage tank module at the previous moment; r1 is the thermal energy conversion coefficient corresponding to a unit gas input flow rate; r2 is the molten salt thermal energy consumption coefficient required for a unit steam output; x g (t) represents the flow rate entering the molten salt thermal storage tank module at the current moment; q steam (t) represents the steam output at the current moment.

[0079] This invention also provides a computer device; please refer to [link / reference]. Figure 3 , Figure 3 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 3As shown, the computer device includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 3 Take a processor 10 as an example.

[0080] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0081] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0082] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0083] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0084] The computer device also includes an input device 30 and an output device 40. The processor 10, memory 20, input device 30, and output device 40 can be connected via a bus or other means. Figure 3 Taking the example of a connection between China and Israel via a bus.

[0085] Input device 30 can receive input numerical or character information, and generate key signal inputs related to user settings and function control of the computer device, such as a touchscreen, keypad, mouse, trackpad, touchpad, joystick, one or more mouse buttons, trackball, joystick, etc. Output device 40 may include display devices, auxiliary lighting devices (e.g., LEDs), and haptic feedback devices (e.g., vibration motors). The aforementioned display devices include, but are not limited to, liquid crystal displays, light-emitting diodes, displays, and plasma displays. In some alternative embodiments, the display device may be a touchscreen.

[0086] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0087] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0088] Although embodiments of the 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 invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A blast furnace gas molten salt thermal storage scheduling and utilization system, characterized in that, include: The system includes a blast furnace gas acquisition and distribution module, a molten salt combustion and heating module, a molten salt thermal storage tank module, a steam generation module, and a scheduling optimization module. A blast furnace gas acquisition and allocation module, which is connected to a scheduling optimization module, is used to acquire the gas produced by the blast furnace of the steel plant in real time, and based on the control commands of the scheduling optimization module, allocate the gas to the direct utilization path, or allocate the gas to the molten salt combustion furnace through the molten salt heat storage path. Molten salt combustion heating module, which is used to heat molten salt medium using coal gas as fuel; A molten salt thermal storage tank module, which is connected to the steam generator, is used to store high-temperature molten salt; A steam generating module is used to release heat energy from a molten salt tank to heat water and generate steam when gas is insufficient. The steam is used for power generation or industrial load heating. The scheduling optimization module is used to achieve optimal scheduling of dynamic gas allocation and thermal energy utilization efficiency.

2. The blast furnace gas molten salt thermal storage scheduling and utilization system according to claim 1, characterized in that, The scheduling optimization module is deployed on MATLAB or an equivalent industrial scheduling platform.

3. A method for scheduling and utilizing molten salt thermal energy storage in blast furnace gas, characterized in that, The method is applied to the scheduling optimization module of the blast furnace gas molten salt thermal storage scheduling and utilization system according to any one of claims 1-2, and the method includes: Predict the current blast furnace gas production; Based on the amount of gas wasted through waste, an objective function is established. Establish a gas conservation equation for the predicted current blast furnace gas production, the amount of gas directly utilized, the amount of gas released and wasted, and the amount of gas entering the molten salt combustion heating module. By utilizing multiple constraints and the objective function, the gas conservation equation is dynamically optimized to obtain the amount of gas directly utilized at the current moment and the amount of gas entering the molten salt combustion heating module.

4. The method for scheduling and utilizing blast furnace gas molten salt thermal storage according to claim 3, characterized in that, The objective function is: Where, x loss (t) represents the amount of gas wasted; T represents the scheduling cycle.

5. The method for scheduling and utilizing blast furnace gas molten salt thermal storage according to claim 3, characterized in that, The constraints include: The amount of gas entering the molten salt combustion heating module at the current moment is greater than or equal to the minimum gas input flow rate required by the molten salt combustion heating module, and the amount of gas entering the molten salt combustion heating module at the current moment is less than or equal to the maximum safe gas input flow rate that the molten salt combustion heating module can withstand.

6. The method for scheduling and utilizing blast furnace gas molten salt thermal storage according to claim 5, characterized in that, The constraints also include: The steam flow rate output by the steam generating module at the current moment is greater than or equal to the minimum output steam quantity required for safe heat exchange of the steam generating module, and the steam flow rate output by the steam generating module at the current moment is less than or equal to the upper limit of steam output allowed by the maximum heat exchange capacity of the steam generating module.

7. The method for scheduling and utilizing blast furnace gas molten salt thermal storage according to claim 6, characterized in that, The constraints also include: At the current moment, the thermal state of the molten salt in the molten salt storage tank module is greater than or equal to the minimum allowable heat value, and at the current moment, the thermal state of the molten salt in the molten salt storage tank module is less than or equal to the heat capacity limit.

8. The method for scheduling and utilizing blast furnace gas molten salt thermal storage according to claim 7, characterized in that, The formula for calculating the thermal state of the molten salt in the molten salt storage tank module at the current moment is as follows: h s (t)=h s (t-1)+r1·xg(t)-r2·q steam (t) Among them, h s (t) represents the thermal state of the molten salt in the molten salt storage tank module at the current moment; h s (t-1) represents the thermal state of the molten salt in the molten salt storage tank module at the previous moment; r1 is the thermal energy conversion coefficient corresponding to a unit gas input flow rate; r2 is the molten salt thermal energy consumption coefficient required for a unit steam output; x g (t) represents the flow rate entering the molten salt thermal storage tank module at the current moment; q steam (t) represents the steam output at the current moment.

9. A computer device, characterized in that, include: The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the blast furnace gas molten salt thermal storage scheduling and utilization method as described in any one of claims 3 to 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the blast furnace gas molten salt thermal storage scheduling and utilization method as described in any one of claims 3 to 8.

11. A computer program product, characterized in that, It includes computer instructions for causing a computer to execute the blast furnace gas molten salt thermal storage scheduling and utilization method as described in any one of claims 3 to 8.

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