An energy management and control system for a steel enterprise with energy storage as the core

Abstract

The utility model belongs to metallurgical industry technical field especially relates to a kind of steel enterprise energy management and control system with energy storage as core. Including production terminal, production terminal is connected with waste heat recovery pipe network, coal gas pipe network, internal power grid, internal heat network, internal gas network, internal power grid is connected with purchased electricity access device, new energy power generation device, storage device, purchased electricity access device, new energy power generation device are connected with storage device, purchased electricity access device, new energy power generation device are connected internal heat network by electric heating heat storage device, new energy power generation device is connected production terminal by hydrogen production device, waste heat recovery pipe network is connected internal power grid by steam generator unit, waste heat recovery pipe network is connected steam generator unit, internal heat network by molten salt heat storage device, coal gas pipe network is connected internal power grid by coal-fired generator unit. By the utility model, the use efficiency of energy can be optimized, the enterprise cost is effectively reduced, and green low-carbon development is realized.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical industry technology, and in particular relates to an energy management system for steel enterprises with energy storage as its core. Background Technology

[0002] Most processes in steel enterprises are continuous production processes, resulting in continuous electricity load. However, some equipment has particularly high electricity loads and short power consumption cycles, which significantly impact the internal power grid, causing grid fluctuations. Meanwhile, renewable energy largely relies on natural resources, and the generation and supply times of distributed photovoltaic or wind power projects are cyclical and highly uncertain. As the proportion of renewable energy increases, this cyclicality and uncertainty have a growing impact on the stability of the enterprise's internal power grid. Furthermore, most enterprises also possess waste heat resources such as coal gas and steam, as well as waste heat power generation or self-owned power plants. Therefore, a stable match between the enterprise's energy consumption, electricity load, and energy and power supply is crucial.

[0003] Currently, most steel companies lack energy storage facilities such as thermal and electrical storage. When production fluctuates, they sometimes need to adjust production plans, reduce or stop production in some processes, or release energy to achieve a balance between energy supply and demand, which affects production efficiency and causes a certain degree of energy waste. In addition, some waste heat and energy are not fully utilized during normal production, and the utilization rate and efficiency of waste heat and energy need to be further improved. Summary of the Invention

[0004] The purpose of this invention is to provide an energy management system for steel enterprises with energy storage as its core, in order to solve the problems existing in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An energy management system for steel enterprises with energy storage as its core includes a production terminal. The production terminal is connected to a waste heat recovery pipeline network, an internal power grid, an internal heating network, and an internal gas network. The internal power grid is connected to an external power purchase access device, a new energy power generation device, and an energy storage device. The external power purchase access device, the new energy power generation device, and the energy storage device are connected. The external power purchase access device and the new energy power generation device are connected to the internal heating network through an electric heating thermal storage device. The new energy power generation device is connected to the production terminal through a hydrogen production device. The waste heat recovery pipeline network is connected to the internal power grid through a steam generator set. The waste heat recovery pipeline network is connected to the steam generator set and the internal heating network through a molten salt thermal storage device. The internal gas network is connected to a gas pipeline network. The gas pipeline network is connected to the internal power grid through a coal-fired generator set.

[0007] Furthermore, the waste heat recovery network includes flue gas pipelines and steam pipelines. The waste heat recovery network is connected to the production terminal through the flue gas pipelines and steam pipelines respectively. The flue gas pipelines are connected to the steam pipelines through the waste heat boiler, and the waste heat recovery network is connected to the steam generator set and molten salt thermal storage device through the steam pipelines.

[0008] Furthermore, the new energy power generation devices are photovoltaic generator sets and / or wind turbine sets.

[0009] Furthermore, the energy storage device is a lithium-ion or lithium iron phosphate battery energy storage cabinet.

[0010] This utility model has the following beneficial effects:

[0011] 1. This utility model utilizes an electric heating thermal storage device, a molten salt thermal storage device, and an electric energy storage device to store and convert electrical energy and thermal energy. On the one hand, when the production load decreases, excess energy is stored as electrical energy or thermal energy, and then released and used when the production load increases, reducing energy waste. On the other hand, it can reduce the instability of new energy power generation such as photovoltaic and wind power, reduce the impact on the internal power grid and internal heating network load, and ensure the stability of the production system.

[0012] 2. It can realize a dynamic usage strategy based on the purchased electricity price, and adjust the amount of purchased electricity used according to the off-peak / peak electricity price. During the off-peak period, electricity is stored through the energy storage device, and during the peak period, the amount of purchased electricity is reduced and the energy storage device discharges into the internal power grid, thereby making reasonable use of purchased electricity and reducing electricity costs.

[0013] 3. This utility model can optimize energy use efficiency, effectively reduce enterprise costs, and achieve green and low-carbon development. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] The components include: 1. Production terminal; 2. Waste heat recovery pipeline network; 3. Gas pipeline network; 4. Internal power grid; 5. Internal heating network; 6. Internal gas network; 7. External power supply connection device; 8. New energy power generation device; 9. Energy storage device; 10. Electric heating thermal storage device; 11. Hydrogen production device; 12. Steam generator set; 13. Molten salt thermal storage device; 14. Coal-fired generator set; 15. Flue gas pipeline; 16. Steam pipeline; 17. Waste heat boiler. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the scope of the utility model.

[0017] like Figure 1 As shown, an energy management system for a steel enterprise with energy storage as its core includes a production terminal 1. The production terminal 1 is connected to a waste heat recovery pipeline network 2, an internal power grid 4, an internal heating network 5, and an internal gas network 6. The internal power grid 4 is connected to an external power purchase access device 7, a new energy power generation device 8, and an energy storage device 9. The external power purchase access device 7, the new energy power generation device 8, and the energy storage device 9 are connected. The external power purchase access device 7 and the new energy power generation device 8 are connected to the internal heating network 5 through an electric heating heat storage device 10. The new energy power generation device 8 is connected to the production terminal 1 through a hydrogen production device 11. The waste heat recovery pipeline network 2 is connected to the internal power grid 4 through a steam generator set 12. The waste heat recovery pipeline network 2 is connected to the steam generator set 12 and the internal heating network 5 through a molten salt heat storage device 13. The internal gas network 6 is connected to a gas pipeline network 3. The gas pipeline network 3 is connected to the internal power grid 4 through a coal-fired generator set 14.

[0018] The waste heat recovery network 2 includes a flue gas pipeline 15 and a steam pipeline 16. The waste heat recovery network 2 is connected to the production terminal 1 through the flue gas pipeline 15 and the steam pipeline 16 respectively. The flue gas pipeline 15 is connected to the steam pipeline 16 through the waste heat boiler 17. The waste heat recovery network 2 is connected to the steam generator set 12 and the molten salt heat storage device 13 through the steam pipeline 16.

[0019] The new energy power generation device 8 is a photovoltaic generator set and / or a wind turbine set.

[0020] Energy storage device 9 is a lithium-ion or lithium iron phosphate battery energy storage cabinet.

[0021] The working principle of this utility model is as follows:

[0022] The system integrates four modules—purchased electricity, waste heat, coal gas, and photovoltaic / wind power—with the steel enterprise's production terminal 1. It establishes an energy management and control system for the steel enterprise with energy storage (electricity storage and heat storage) as the core, thereby optimizing resources and improving energy utilization efficiency.

[0023] 1. Application of purchased electricity: Purchased electricity is connected to the internal power grid 4 through the purchased electricity access device 7 and supplied to various electricity users. During off-peak hours, the purchased electricity is stored through the energy storage device 9. During peak hours, the purchased electricity is reduced and discharged into the internal power grid 4 by the energy storage device 9 to supplement the use. Purchased electricity is stored in heat through the electric heating heat storage device 10 to supplement the use of the internal heating network 5.

[0024] 2. The new energy power generation unit 8 generates electricity from new energy sources such as photovoltaics and wind power and connects it to the internal power grid 4 to supply the production terminal 1. It also produces hydrogen using green electricity through the hydrogen production unit 11 to supply the production terminal 1. When there is surplus electricity generated by the new energy power generation unit 8, it is stored in the energy storage device 9. When the production load increases, it supplies electricity to the internal power grid 4. The new energy power generation unit 8 also performs electric heating and heat storage, which is stored in the electric heating and heat storage device 10 to supplement the internal heat network 5.

[0025] 3. Waste heat recovery network 2 recovers the flue gas and steam generated by production terminal 1 through flue gas pipeline 15 and steam pipeline 16. Flue gas pipeline 15 uses waste heat from flue gas to generate steam through waste heat boiler 17. The generated steam and the recovered steam in steam pipeline 16 are used together to generate electricity through steam generator set 12 and connected to internal power grid 4. When there is excess waste heat, it is stored through molten salt heat storage device 13, which can supplement power generation on the one hand and supplement internal heat network 5 on the other hand.

[0026] 4. Gas application: In addition to being used for production at production terminal 1 through internal gas network 6, the gas produced at production terminal 1 is also transported to coal-fired power generation unit 14 through gas pipeline network 3 for power generation, which is then used by internal power grid 4.

[0027] 5. During the production process, based on changes in production load, the electric heating thermal storage device 10, the molten salt thermal storage device 13, and the power storage device 9 are used to convert electrical energy into thermal energy, thereby optimizing energy utilization.

[0028] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention.

[0029] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. An energy management and control system for steel enterprises with energy storage as its core, characterized in that, The system includes a production terminal connected to a waste heat recovery pipeline network, an internal power grid, an internal heating network, and an internal gas network. The internal power grid is connected to an external power purchase access device, a new energy power generation device, and an energy storage device. The external power purchase access device, the new energy power generation device, and the energy storage device are connected. The external power purchase access device and the new energy power generation device are connected to the internal heating network via an electric heating heat storage device. The new energy power generation device is connected to the production terminal via a hydrogen production device. The waste heat recovery pipeline network is connected to the internal power grid via a steam generator set. The waste heat recovery pipeline network is connected to the steam generator set and the internal heating network via a molten salt heat storage device. The internal gas network is connected to a coal gas pipeline network. The coal gas pipeline network is connected to the internal power grid via a coal-fired generator set. The waste heat recovery network includes flue gas pipelines and steam pipelines. The waste heat recovery network is connected to the production terminal through the flue gas pipelines and steam pipelines respectively. The flue gas pipelines are connected to the steam pipelines through the waste heat boiler. The waste heat recovery network is connected to the steam generator set and the molten salt heat storage device through the steam pipelines.

2. The energy management system for steel enterprises with energy storage as its core, as described in claim 1, is characterized in that, The new energy power generation device is a photovoltaic generator set and / or a wind turbine set.

3. The energy management system for steel enterprises with energy storage as its core, as described in claim 1, is characterized in that... The energy storage device is a lithium-ion or lithium iron phosphate battery energy storage cabinet.

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