New energy electric energy virtual storage system

Abstract

The invention discloses a new energy electric energy virtual storage system which comprises a large heating furnace, a petrochemical fuel heating subsystem of the large heating furnace, an electric heating subsystem and a control subsystem, and the system can effectively utilize fluctuating new energy electric power and / or low-price off-peak electricity in real time to reduce or stop input of petrochemical fuel. When high-price electricity or new energy of the power grid is weakened and disappears, petrochemical energy is input. According to the system, electric power and petrochemical fuel are added and reduced in real time through computer operation, possible waste electric energy is fully utilized while the output material temperature is met, the large-scale light and wind abandoning phenomenon is avoided, the use amount of non-renewable energy resources is reduced, and virtual storage of new energy and / or power grid low-price off-peak electricity is achieved; foreign exchange is saved, waste is avoided, use of petrochemical energy is reduced, and environmental pollution is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy, in particular to a new energy electric energy virtual storage system. BACKGROUND

[0002] If the new energy is used as a primary power source alone, due to its instability and the characteristics of relying on the weather, it is difficult to find a suitable user or load, although small-capacity new energy power can be alleviated by battery pack storage and other methods, but at this time the safety and life problems of the battery pack become particularly prominent. For large-capacity new energy power generation, it needs super-large-scale and super-large-capacity battery packs, which are extremely high in cost and safety risk, and currently cannot be used in engineering, and usually need to be connected to the power grid (also known as large power grid) before being put into use.

[0003] However, this unstable large-capacity new energy power grid connection will have a great impact on the large power grid, and when the large power grid cannot eliminate such sudden fluctuations, the phenomenon of "abandoning light and wind" occurs. With the increasing of new energy generation capacity, especially for large-capacity new energy power generation, the "abandoning light and wind" phenomenon is becoming more and more serious.

[0004] Large industrial and mining enterprises, especially industrial and mining enterprises in the "three north" area, mostly have self-provided power plants or equipment facilities, or have new energy power plants nearby to use as much green and clean energy as possible, and strive to achieve green production and green manufacturing, and the installed capacity of such new energy power plants is very high. The traditional battery pack electric energy buffering method is not applicable, and all need to be connected to the large power grid for regulation and control, so it is inevitable to face the problem of large-scale "abandoning light and wind".

[0005] Therefore, there is an urgent need for an economical and effective large-capacity new energy electric energy use or storage method. SUMMARY

[0006] The purpose of the present application is to alleviate or solve the serious "abandoning light and wind" problem faced by the current new energy industry, and to provide a reasonable use method for large-capacity and unstable new energy electric energy, so as to realize the virtual storage of new energy electric energy.

[0007] In order to achieve the above object, the present application designs a new energy electric energy virtual storage system, new energy power and mains without grid connection (without special description, this application refers to the traditional power direct grid connection), the virtual storage system includes a large heating furnace and its petrochemical fuel heating subsystem, electric heating subsystem and control subsystem, the present application is also called as petrochemical fuel and electric hybrid heating system, the large heating furnace includes heating furnace body, material inlet device, material outlet device, combustion air inlet device and petrochemical fuel inlet device, the petrochemical fuel heating system is the original heating system of the heating furnace, the petrochemical fuel heating subsystem, electric heating subsystem and control subsystem are electrically connected;The electric heating subsystem includes at least one of heating furnace body electric heating unit, material inlet electric preheating unit, material outlet electric heat preservation unit, combustion air electric preheating unit, petrochemical fuel electric preheating unit (the above units are collectively referred to as electric heating unit) and the like, which are respectively installed in the heating furnace corresponding to the heated medium flow or buffer part of the pipeline or hearth; The control subsystem includes a detection unit and a cooperative control unit, the detection unit at least includes corresponding sensors or instruments of medium temperature detection, medium flow detection and electric quantity detection;The electric energy source of the electric heating subsystem includes new energy direct power supply and / or mains power supply.

[0008] Further, the electric quantity detection project includes at least one of current, voltage or power;The measured object of the electric quantity detection includes at least new energy power generation (or available power).

[0009] Further, the medium includes material, combustion air or petrochemical fuel;The mains power supply of the electric heating subsystem includes valley power supply.

[0010] Further, the large heating furnace includes at least one of the furnace heated by traditional petrochemical fuel, such as boiler, steam superheater, annealing furnace, natural gas furnace, cracking furnace, etc.;The virtual storage system includes a new energy electric energy virtual storage system composed of two or more large heating furnaces, the corresponding petrochemical fuel heating subsystem and electric heating subsystem of each large heating furnace correspond to independent layout, the control subsystem includes the control subsystem independently arranged for each large heating furnace or the control subsystem integrally arranged for several (including all) large heating furnaces.

[0011] Further, the new energy electric energy includes solar energy, wind energy, tidal energy or sea wave energy.

[0012] Further, since the mains and new energy power supply are not grid connected, all electric heating units need special design, when the mains and new energy power supply are jointly used, the electric heating subsystem includes design mode one or design mode two. The design mode one includes two sets of heating devices for each electric heating unit designed for mains heating and new energy power supply heating respectively, and each set of device is controlled by the control switch and power regulation of the control subsystem. The design mode two includes connecting the mains and new energy power supply through single-pole double-throw or double-pole double-throw switches and then connecting the heating device.

[0013] Further, the cooperative control method of the virtual storage system includes a heating furnace body cooperative control method or a body and auxiliary heating cooperative control method.

[0014] Further, the heating furnace body cooperative control method includes: According to the design requirement information of material type (obtainable specific heat, unit mass vaporization heat absorption parameters), inlet temperature, outlet temperature, outlet pressure, power generation capacity corresponding outlet flow (unified with mass flow kg / s for measurement and calculation, which can be converted with volume flow), etc., the target material output power requirement can be calculated and obtained, denoted as P D_out , the measured output power is P C_out , both are known quantities; the specific heat of combustion air C air , the inlet combustion air temperature is T air , the mass flow is M air ; the petrochemical fuel ignition temperature is T fire , the specific heat of petrochemical fuel C fuel , the inlet petrochemical fuel temperature is T fuel , the mass flow is M fuel , the unit mass petrochemical fuel combustion heat release energy W fuel , wherein M air and M fuel are unknown quantities, and the rest are known quantities; the real-time available power of new energy power P new (including measured power or real-time predicted power), the real-time available power of mains P AC , both are known quantities. According to the petrochemical fuel combustion equation, there is a certain proportional relationship between M air and M fuel , and the proportional coefficient is k1; that is, (1) According to the energy conservation theorem, (2) wherein, is the petrochemical fuel combustion efficiency, is the electric heating efficiency, both are known quantities. First, for the case of P AC =0, i.e. no mains power supply, according to the new energy power supply power P new, formula 1 and formula 2 are solved simultaneously M air And M fuel That is; Secondly, for the case of existing mains power supply, M air And M fuel The value corresponding to zero or minimum combustion quantity, in short, is a determined value, and the mains supply supplements the part of the new energy power supply that is insufficient to meet the energy demand.

[0015] Further, the body and auxiliary heating cooperative control method comprises: According to the design requirement information of material type (obtainable specific heat, unit mass vaporization heat absorption parameters), inlet temperature, outlet temperature, outlet pressure, power generation capacity corresponding outlet flow (unified with mass flow kg / s for calculation, which can be converted with volume flow), etc. The target output power demand can be calculated and obtained, denoted as P D_out , the measured output power is P C_out , both are known quantities; the specific heat of combustion air C air , the inlet combustion air temperature is T air , the mass flow is M air ; the ignition temperature of petrochemical fuel is T fire , the specific heat of petrochemical fuel C fuel , the inlet petrochemical fuel temperature is T fuel , the mass flow is M fuel , the unit mass petrochemical fuel combustion heat energy W fuel , wherein M air And M fuel Are unknown quantities, and the rest are known quantities; the real-time available power of new energy power P new (Including measured power or real-time predicted power), the real-time power supply of mains P AC , both belong to known quantities; Wherein, according to the petrochemical fuel combustion equation, there is a certain proportional relationship between M air And M fuel , and the proportional coefficient is k1; that is (1) According to the energy conservation theorem, we have (2) Wherein, The combustion efficiency of petrochemical fuel is C The electric heating efficiency is known; According to the electric power distribution scheme, we have (3) Wherein, P1 is the power allocated to the electric heating unit of the furnace body, P2 is the power allocated to the electric preheating unit of the material inlet, P3 is the power allocated to the electric insulation unit of the material outlet, P4 is the power allocated to the electric preheating unit of the combustion air, and P5 is the power allocated to the electric preheating unit of the petrochemical fuel. First, for P AC In the case where the power supply is 0, i.e., there is no mains power supply, then the power supply capacity P of the new energy source is used as the basis. new Solve M by combining Equations 1 and 2. air and M fuel Then, the power of the new energy source is allocated according to the boundary conditions, power allocation strategy, and Formula 3. Secondly, for situations where mains power is available, M air and M fuel The value corresponding to zero or minimum combustion is a definite value, which is the part of the energy supply from the mains power supply that is insufficient for the energy demand from new energy sources; then the power is allocated according to the power allocation strategy and formula 3.

[0016] Furthermore, the power allocation strategy includes a proportional allocation strategy, a priority allocation strategy, or an efficiency allocation strategy; The proportional allocation strategy includes a strategy of allocating power proportionally within the upper limit of the power of each electric heating unit. The priority allocation strategy includes pre-defining the priority of each electric heating unit, with higher priority units heating at full power first; The efficiency allocation strategy includes defining the power allocation ratio based on the individual electric heating efficiency of each electric heating unit. Under the premise of meeting the boundary conditions, the higher the efficiency of the unit, the higher the power allocation ratio it receives, until it reaches its rated power value.

[0017] Furthermore, the method for coordinated control of the main body and auxiliary heating also includes: When the measured output power of the large heating furnace is P C_out With design requirements P D_out When a deviation occurs, based on the actual amount of electricity and petrochemical fuel used, and under the premise of meeting the boundary conditions, if it is necessary to reduce energy output, then the petrochemical fuel energy input should be reduced first; if it is necessary to increase energy output, then the electrical energy input should be increased first. Then, the changes in petrochemical fuel and electrical power are calculated according to the principles of Formulas 1 to 2, and finally, the corresponding control commands are issued through the control subsystem.

[0018] Furthermore, the method for coordinated control of the main body and auxiliary heating also includes: When the measured output power of the large heating furnace is P C_out With design requirements P D_outWhen the deviation occurs, according to the actual use of electricity and the amount of petrochemical fuel, under the premise of meeting the boundary conditions, if the energy output needs to be reduced, the petrochemical fuel energy input is reduced first; if the energy output needs to be increased, the electricity input is increased first; then the change amount of petrochemical fuel and the change amount of electric power are calculated according to the principles of formula 1 to formula 3, and finally the corresponding control instructions are issued through the control subsystem.

[0019] The advantages and beneficial effects of the present application are: Currently, while renewable energy development has made great achievements, the problems of wind power and photovoltaic power consumption difficulty and increasing "abandoned wind and light" power have become increasingly prominent, and large-scale new energy consumption has been a worldwide problem.

[0020] This situation not only causes waste of energy resources, but also brings serious economic losses to renewable energy power generation enterprises, discourages the enthusiasm of investors to continue investing in renewable energy infrastructure projects, and affects sustainable development.

[0021] The large heating furnace of the present application can operate with dual energy, and the technical effects are obvious: 1. By designing the petrochemical fuel-electricity hybrid heating system of the large heating furnace, the problem of unstable new energy power generation such as solar energy and wind energy and the inability to be used continuously is solved, and the problems of high cost, difficult safety guarantee and immature technology of current super large capacity battery energy storage are also avoided.

[0022] 2. The method of the present application can realize the digestion of new energy in the "Three North" region, and the new energy power can be directly used, reducing the demand for multiple inversion and direct grid connection and transmission; for new energy power generation and nearby thermal power plants, the application of the present application is equivalent to a kind of virtual grid connection or local grid connection of new energy, which is essentially a kind of energy grid connection technology, rather than a traditional direct power grid connection technology.

[0023] 3. The new system of the present application can not only absorb new energy power near it, but also can work independently without grid connection, and the heating furnace itself has peak shaving capability, solving the big problem of "abandoned wind and light" when new energy leaves the grid for peak shaving, although the use efficiency of new energy may be lower than that of direct grid connection, but it is still better than direct "abandoned wind and light".

[0024] 4. The new system of the present application can also absorb low-price electricity during valley period, reducing the waste of valley electricity.

[0025] 5. The large heating furnace can peak shave the grid, which is a win-win technology for industrial and mining enterprises and power plants. At present, places rich in solar and wind energy in China are mostly places rich in mineral resources, and mineral processing requires a lot of heat energy. The petrochemical fuel-electricity hybrid heating system enables new energy to be connected nearby, without the need for thermal power peak shaving, solving the problems of new energy power transmission loss and peak shaving.

[0026] 6. Reduce the import or internal exploitation of petrochemical energy, so as to realize the virtual storage of new energy electric energy, and benefit the environmental construction.

[0027] 7. Regarding the new energy electric power efficiency, the direct grid-connection use efficiency of traditional new energy is about 85% (without considering "abandoned light and wind", only considering grid-connection and transmission loss, etc.), the use efficiency of battery group buffer is less than 70%, and the direct heating efficiency of the new energy electric power of the present application can reach more than 97%. From this point, for large industrial and mining enterprises, even if the problem of "abandoned light and wind" is not considered, the use efficiency of the new energy electric power of the present application is obviously improved. If the problem of "abandoned light and wind" is considered, the use efficiency of the new energy electric power is more considerable.

[0028] In summary, the system of the present application can realize real-time addition and subtraction of electric power and petrochemical fuel through computer operation, fully utilizes the possible abandoned electric energy while meeting the output material temperature, avoids large-scale "abandoned light and wind" phenomenon, reduces the use amount of non-renewable energy, realizes the virtual storage of new energy and / or low-price valley electric power of the power grid, saves foreign exchange, avoids waste, reduces the use of petrochemical energy and environmental pollution, and can produce obvious technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the system structure connection diagram of the present application.

[0030] Markings in the figure: R1, heating furnace body electric heating unit; R2, material inlet electric preheating unit; R3, material outlet electric heat preservation unit; R4, combustion air electric preheating unit; R5, petrochemical fuel electric preheating unit; F1, heating furnace; F2, petrochemical fuel heating sub-system; K1, control sub-system; K2, burner fan; IN1, material inlet; IN2, combustion air inlet; IN3, petrochemical fuel inlet; OUT1, material outlet; The remaining markings in the figure are shown in the following table: DETAILED DESCRIPTION

[0031] The specific embodiments of the present application will be further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0032] For small-capacity new energy power generation, battery can be used for power storage, and there is no need for grid connection. Even if grid connection is needed, the impact on the power grid is not great because the power fluctuation can be controlled. However, for large-capacity new energy, on the one hand, battery storage is difficult to achieve, and on the other hand, the safety of large-capacity batteries has not been solved, so the battery storage technology is not suitable for the current demand of large-capacity new energy.

[0033] After the grid connection of large-capacity new energy, the power plant mainly adjusts the steam generation of the boiler to cope with the impact of grid connection of new energy. When the grid connection power is too high or the grid connection power is too large, it is difficult to offset the grid connection and disconnection power impact through the adjustment, and it is necessary to shut down or restart several boilers to achieve this, and the start and shutdown of the boiler need a long process (neither immediate start nor immediate shutdown), and the boiler is usually continuously running after starting, and cannot be arbitrarily shut down and started, unless for failure or regular maintenance, which will inevitably cause the phenomenon of abandoning light and wind.

[0034] To solve the above problems, first of all, the energy consumption status of power generation and large energy consumers is reviewed.

[0035] The existing petrochemical fuel heating furnace, including power generation boiler, is a single petrochemical fuel combustion heating, which is collectively referred to as a heating furnace. Currently, the main process of typical thermal power generation is to generate steam in the boiler to drive the steam turbine to drive the generator to generate electricity. After passing through the steam turbine, the steam with reduced temperature is reheated by the steam superheater and then fed into the steam turbine again.

[0036] Most large industrial and mining enterprises cannot do without large-scale heating furnaces in continuous production, and such heating furnaces mainly consume petrochemical fuels including natural gas. Natural gas is a major imported commodity, and gas heating furnaces are the main natural gas consumption equipment: For example, a factory with 10 natural gas annealing furnaces has a total continuous power of 2.5 MW; For example, a single natural gas furnace for material hydrogenation in a chemical plant has a power of 2.3 MW; For example, a single natural gas furnace for lithium ore drying has a power of 10 MW; For example, a single natural gas furnace for steam superheater in a factory self-provided power plant has a power of 16 MW; For example, a cracking furnace in a refinery and petrochemical process has a heating power of 300-600 MW.

[0037] In summary, as a device for heating materials, natural gas heating furnaces are currently important representatives, and generally work continuously, with huge demand for natural gas and huge energy consumption.

[0038] Considering that large traditional fuel heating equipment such as boilers and / or steam superheaters exist in current large industrial and mining enterprises and thermal power plants, the present application simultaneously inputs new energy and traditional heating energy into a heating furnace, realizes reasonable use of large-capacity new energy through collaborative control, and saves traditional petrochemical fuels; the present application adds an electric heating system to the current mainstream natural gas heating furnace system, changes single-fuel heating into gas-electric hybrid heating, and when new energy electric energy is available, electric energy is inputted for heating, thereby saving mainstream petrochemical fuels such as natural gas, which is equivalent to indirectly / virtually storing new energy electric energy in saved petrochemical fuels.

[0039] Specifically, the present application realizes output control of target steam (flow, pressure, temperature, etc.) by monitoring new energy electric energy in real time (including current, voltage or power, and temperature, flow, etc. of electric heating medium), and adjusting and controlling gas usage (flow) in real time.

[0040] Embodiment 1: The present application is a new energy electric energy virtual storage system, and new energy electric power does not need to be connected to the grid (here, it means that new energy electric power can be used without being connected to the grid after the grid), such as Figure 1 As shown, the virtual storage system includes a large heating furnace F1 and a petrochemical fuel heating subsystem F2, an electric heating subsystem and a control subsystem K1, and the present application is also called a petrochemical fuel and electric hybrid heating system, the large heating furnace includes a heating furnace body, a material inlet device, a material outlet device, a combustion air inlet device and a petrochemical fuel inlet device, the petrochemical fuel heating system is the original heating system of the heating furnace, the petrochemical fuel heating subsystem F2, the electric heating subsystem and the control subsystem are electrically connected (the electrical connection is omitted in the figure, and only part of the electrical connection of the control subsystem and each control unit and its valves, sensors and instruments is shown); the electric heating subsystem includes at least one of a heating furnace body electric heating unit R1, a material inlet electric preheating unit R2, a material outlet electric heat preservation unit R3 (sometimes also called an electric superheating unit, mainly to make up for heat loss in the material transmission process), a combustion air electric preheating unit R4, a petrochemical fuel electric preheating unit R5 (the above units are collectively referred to as heating units) and the like, which are respectively installed at the heated medium flow-through or buffer part of the corresponding pipeline or hearth of the heating furnace, such as on the pipeline or in the hearth; considering that there are inconvenient implementation links in the modification of old equipment, therefore, the appropriate combination of the above several units can be designed according to the actual situation on site, and the low-temperature petrochemical fuel generally does not set up a corresponding fuel preheating unit, and the present embodiment designs all the above heating units; The heating furnace body electric heating unit R1 includes installing an electric heating element in the heating furnace; the material inlet electric preheating unit R2 includes installing an electric heating element in front of the heating furnace to preheat the material; the material outlet electric heat preservation unit R3 includes installing an electric heating element behind the heating furnace to superheat the material, which is also called an electric superheating unit, mainly to make up for heat loss during material transmission; the combustion air electric preheating unit R4 includes installing an electric heating element on the combustion air pipeline to preheat the combustion air; and the petrochemical fuel electric preheating unit R5 includes installing an electric heating element on the fuel pipeline to preheat the fuel. All the above units are collectively referred to as electric heating units.

[0041] The control subsystem includes a detection unit and a cooperative control unit (belonging to a DCS, PLC computer control system), which mainly completes real-time monitoring of the temperature, pressure, flow, current, voltage, and power of each subsystem, and real-time control of switch on-off, valve rotation angle, and electric power size. In this embodiment, the electric heating control device and the fuel heating control device are classified as the electric heating subsystem and the petrochemical fuel heating subsystem, respectively, and the control quantity calculation and control instructions are all from the cooperative control unit. The control subsystem also includes a material inlet control unit, a material outlet control unit, a combustion air control unit, and a petrochemical fuel inlet control unit, which respectively control the material inlet quantity, the pressure and flow of the material (steam) outlet, and the flow of the combustion air, which are all conventional control devices of the heating furnace. The detection unit includes at least corresponding sensors or instruments for medium temperature detection, medium flow detection, and electric quantity detection. The electric energy source of the electric heating subsystem includes new energy direct power supply and / or commercial power supply. All temperature, pressure, flow, voltage, current, and power detection sensors or instruments are installed on the corresponding pipelines, lines, or containers according to industry standards or practices. The sensors and instruments of each detection unit and the switches, valves, etc. of each control unit are distributed alternately, so the explicit boundaries of each detection unit and control unit are not shown.

[0042] The system can control the subsystem to use new energy power as much as possible according to new energy power supply conditions, determine the input quantity and timing according to commercial power input decision conditions, and issue different control instructions to different heating units or subsystems to real-time adjust the petrochemical fuel input quantity, control the free switching and power adjustment of each unit (including petrochemical fuel input control), and realize petrochemical fuel-electricity hybrid heating (generally gas-electricity hybrid heating, so it is also called a gas-electricity hybrid heating system) and single energy heating, so that new energy power can be fully utilized, the phenomenon of "abandoning light and wind" can be avoided, and petrochemical fuel can be reasonably saved, i.e., virtual storage of new energy power.

[0043] Virtual storage refers to saving fossil fuels by effectively utilizing new energy sources, specifically by virtually storing new energy sources and / or off-peak electricity in the saved fossil fuels.

[0044] Preferably, the power consumption detection items include at least one of current, voltage, or power. For example, for constant current source heating, voltage or power can be measured, and for constant voltage source heating, current or power can be measured. In short, it is necessary to measure the power consumption of heating in order to more accurately control the amount of petrochemical fuel used. The measured object of the power consumption detection includes at least the power generation (or available power) of new energy sources, such as real-time power or real-time predicted power (the prediction accuracy needs to be within the allowable power fluctuation error range). In this embodiment, real-time power consumption detection is also performed on each electric heating unit.

[0045] Preferably, the medium includes materials, combustion air, or petrochemical fuels; the power source for the electric heating subsystem also includes mains power (when the cost of electricity is lower than the cost of petrochemical fuels, mains power heating can be considered as the main method, generally during off-peak hours). This embodiment simultaneously designs new energy power supply and mains power supply. The materials include water and / or steam, which are boiler working media. The petrochemical fuels include liquefied petroleum gas, natural gas, shale gas, gasoline, diesel, kerosene, coal (flow detection is equivalent to weight or mass detection, and ultimately it is all about usage detection or control), etc.

[0046] Preferably, the large heating furnace includes a boiler, a steam superheater, an annealing furnace, a natural gas furnace, and a pyrolysis furnace; this embodiment takes a single natural gas furnace as an example and designs a new energy virtual energy storage system based on the natural gas furnace.

[0047] Preferably, the new energy source includes solar energy, wind energy, tidal energy, or wave energy, etc., and is characterized by the fact that none of them can provide a stable power supply for a long period of time. For ease of introduction, this invention focuses on solar energy and wind energy as examples.

[0048] Preferably, since the mains power and the new energy power supply are not connected to the grid, all electric heating units need to be specially designed. When the mains power and the new energy power supply are used in combination, the electric heating subsystem includes design mode one or design mode two. In this embodiment, the mains power and new energy power supply are combined. Design mode one is adopted. Each electric heating unit (all units of the electric heating subsystem) is designed with two sets of heating devices: one for mains power heating and one for new energy power heating. Each set of devices is controlled by the control subsystem to switch and adjust the power. In this way, the mains power heating and the new energy power heating can maintain their original heating and power supply methods, such as constant voltage source mode, constant current source mode, DC mode, AC mode, high voltage mode, low voltage mode, etc., and can independently heat the same medium. Example 2: The difference from Embodiment 1 is that the large heating furnace described in this embodiment includes at least two types of furnaces heated by traditional petrochemical fuels, such as boilers, steam superheaters, annealing furnaces, natural gas furnaces, and pyrolysis furnaces; the virtual storage system includes a new energy power virtual storage system composed of two or more large heating furnaces, with the petrochemical fuel heating subsystem and electric heating subsystem corresponding to each large heating furnace being independently arranged; the control subsystem includes a control subsystem independently set for each large heating furnace or a control subsystem integrated for several (including all) large heating furnaces; in actual engineering, multiple heating furnaces are generally used to jointly complete the virtual storage of new energy power. This embodiment also includes a new energy power virtual storage system of boilers, steam superheaters, annealing furnaces, natural gas furnaces, and pyrolysis furnaces, and its control subsystem adopts an integrated setting method, which can improve the consumption capacity of large-capacity new energy power and the adaptability of the virtual storage system.

[0049] Example 3: The difference from Embodiment 1 is that this embodiment adopts Design Mode 2, which connects the mains power and the new energy power supply respectively through a single-pole double-throw or double-pole double-throw switch before connecting the heating device. That is, at the same time, the independent electric heating unit, heat preservation power supply or preheating unit is only connected to one power supply. The mains heating and the new energy power supply heating use the same heating device (therefore the heating method and the power supply method are generally the same, but the two are still not connected to the grid). The single-pole double-throw or double-pole double-throw switch includes a traditional controlled hardware switch or an electronic switch. The specific power supply and the amount of power provided are controlled by the control subsystem.

[0050] Example 4: In the foregoing embodiments and their preferred embodiments, the virtual storage system further includes a collaborative control method, such as a furnace body collaborative control method or a furnace body and auxiliary heating collaborative control method; the furnace body collaborative control method is for systems that only require heating control of the furnace body; the furnace body and auxiliary heating collaborative control method is a collaborative control method for furnace bodies that have at least two simultaneous heating requirements among electric heating of materials, electric preheating of material inlet, electric insulation of material outlet, electric preheating of combustion air, and electric preheating of petrochemical fuel.

[0051] This embodiment employs a coordinated control method for the heating furnace body, including: Based on the material type (parameters such as specific heat and heat absorption per unit mass of vaporization are available), inlet temperature, outlet temperature, outlet pressure, and outlet flow rate corresponding to the power generation (calculated using mass flow rate kg / s, which can be converted to volumetric flow rate), the output power requirement of the target material can be calculated, denoted as P. D_out The measured output power is P. C_out All are known quantities; the specific heat of combustion air, C air The inlet combustion air temperature is Tair The mass flow rate is M air The ignition temperature of petrochemical fuels is T. fire Specific heat of petrochemical fuels C fuel The inlet petrochemical fuel temperature is T. fuel The mass flow rate is M fuel Heat release energy per unit mass of fossil fuel combustion (W) fuel M air and M fuel One is an unknown quantity, and the rest are known quantities; the real-time available power supply P of new energy power. new The real-time available power supply P from the mains power AC (Including measured power or real-time predicted power), all of which are known quantities; Among them, according to the petrochemical fuel combustion equation, M air and M fuel There exists a definite proportional relationship between them, let the proportionality coefficient be k1; that is... (1) Furthermore, when the decision is made to use mains power, theoretically, full-power supply is possible, meaning no fossil fuels or new energy sources are needed. However, in actual engineering projects, the use of new energy sources should be considered first. Secondly, some large heating furnaces generally do not shut down their fossil fuels, meaning a minimum fuel and energy supply needs to be maintained. Any energy shortage is then supplied by mains power. The real-time mains power supply power P described in this invention... AC This refers to the real-time power supply from the mains under these conditions; According to the law of conservation of energy, we have (2) in, For the combustion efficiency of fossil fuels, The values ​​are all known quantities, representing the electric heating efficiency. When there are differences in the efficiency of each electric heating unit, the average electric heating efficiency is generally considered to be used. The specific efficiency can be fine-tuned based on actual usage experience. In short, the real-time output power of the system should be controlled within the allowable fluctuation range. Although M in the above equation air and M fuel All are unknown, but essentially there is only one unknown; the goal of the aforementioned coordinated control method for the heating furnace body is to calculate the supply of combustion air and petrochemical fuel in real time, i.e., M. air and M fuel .

[0052] First, for P AC In the case where the power supply is 0, i.e., there is no mains power supply, then the power supply capacity P of the new energy source is used as the basis. new Solve M by combining Equations 1 and 2. air and M fuelThat is, when the power output of the new energy source (after efficiency conversion, the same below) is greater than or equal to the design power output requirement of the large heating furnace, the corresponding M air and M fuel The value corresponding to zero or minimum combustion; when P new When the value is also 0, the system is equivalent to a single petrochemical fuel heating system; Secondly, for situations where mains power is available (such as during off-peak hours, where cost optimization rules might prioritize the use of renewable energy sources with mains power supplementing any shortfall), the control strategy is relatively simple. air and M fuel The value corresponding to zero or minimum combustion output, in short, a definite value, represents the portion of energy demand that is insufficient for renewable energy supply in addition to the mains power supply; when M fuel When the value is 0, the system is equivalent to a single electric heating system.

[0053] Preferably, the coordinated control method of the main body and auxiliary heating further includes: When the measured output power of the large heating furnace is P C_out With design requirements P D_out When deviations occur, traditional control methods adjust the material feed rate, combustion air intake rate, and petrochemical fuel intake rate in real time based on the magnitude of the deviation and combustion efficiency. The basic principle of this invention is similar, but the difference lies in that it adjusts the input of petrochemical fuel based on the actual amount of electricity and petrochemical fuel used, while meeting boundary conditions. If energy output needs to be reduced, the petrochemical fuel energy input is reduced first; if energy output needs to be increased, the electrical energy input is increased first. Then, the changes in petrochemical fuel and electrical power are calculated according to the principles of Formulas 1 and 2, and finally, corresponding control commands are issued through the control subsystem.

[0054] Example 5: The difference from Example 4 is that this example is for an integrated system with two or more large heating furnaces, and for P AC In the case of =0, the new energy power can be allocated proportionally according to the rated output power of each large heating furnace before executing the solution process for a single heating furnace in Example 4 above, or a new energy power supply priority can be defined for each large heating furnace, and power can be supplied at full power in sequence according to priority (at this time, the M corresponding to the large heating furnace air and M fuel (The value corresponding to zero or minimum combustion amount) is used for the part that is less than full power, and the above solution process is performed again for a single heating furnace. Although, theoretically, when the supply of new energy power exceeds the power demand of all heating furnaces, the phenomenon of "curtailment of solar and wind power" will also occur, in fact, the installed capacity of new energy near large industrial and mining enterprises is far from meeting their actual power consumption demand.

[0055] In situations where mains power is available, integrated systems with two or more large heating furnaces can also operate at full power.

[0056] Example 6: The difference from Example 4 is that this example uses a combined control method of main body and auxiliary heating, including: Based on the material type (parameters such as specific heat and heat absorption per unit mass of vaporization are available), inlet temperature, outlet temperature, outlet pressure, and outlet flow rate corresponding to the power generation (calculated using mass flow rate kg / s, which can be converted to volumetric flow rate), the target output power requirement can be calculated, denoted as P. D_out The measured output power is P. C_out All are known quantities; the specific heat of combustion air, C air The inlet combustion air temperature is T air The mass flow rate is M air The ignition temperature of petrochemical fuels is T. fire Specific heat of petrochemical fuels C fuel The inlet petrochemical fuel temperature is T. fuel The mass flow rate is M fuel Heat release energy per unit mass of fossil fuel combustion (W) fuel M air and M fuel One is an unknown quantity, and the rest are known quantities; the real-time available power supply P of new energy power. new (Including measured power or real-time predicted power), real-time mains power supply power P AC All of them are known quantities; Among them, according to the petrochemical fuel combustion equation, M air and M fuel There exists a definite proportional relationship between them, let the proportionality coefficient be k1; that is... (1) Furthermore, when the decision is made to use mains power, theoretically, full-power supply is possible, meaning no fossil fuels or new energy sources are needed. However, in actual engineering projects, the use of new energy sources should be considered first. Secondly, some large heating furnaces generally do not shut down their fossil fuels, meaning a minimum fuel and energy supply needs to be maintained. Any energy shortage is supplied by mains power. The real-time available mains power P described in this invention... AC This refers to the real-time power supply from the mains under these conditions; According to the law of conservation of energy, we have (2) in, For the combustion efficiency of fossil fuels, The values ​​are all known quantities, representing the electric heating efficiency. When there are differences in the efficiency of each electric heating unit, the average electric heating efficiency is generally considered to be used. The specific efficiency can be fine-tuned based on actual usage experience. In short, the real-time output power of the system should be controlled within the allowable fluctuation range. Although M in the above equation air and M fuel All are unknown, but essentially there is only one unknown; one of the goals of the aforementioned furnace body collaborative control method is to calculate the supply of combustion air and petrochemical fuel in real time, i.e., M. air and M fuel The second objective is to determine how to rationally allocate electrical power among the electric heating unit of the furnace body, the electric preheating unit at the material inlet, the electric insulation unit at the material outlet, the electric preheating unit for combustion air, and the electric preheating unit for petrochemical fuel.

[0057] According to the power distribution scheme, there are (3) Wherein, P1 is the power allocated to the electric heating unit of the furnace body, P2 is the power allocated to the electric preheating unit of the material inlet, P3 is the power allocated to the electric insulation unit of the material outlet, P4 is the power allocated to the electric preheating unit of the combustion air, and P5 is the power allocated to the electric preheating unit of the petrochemical fuel. First, for P AC In the case where the power supply is 0, i.e., there is no mains power supply, then the power supply capacity P of the new energy source is used as the basis. new Solve M by combining Equations 1 and 2. air and M fuel Then, based on boundary conditions (such as various threshold requirements, rated power limits, maximum power limits, temperature limits, pressure limits, etc., the temperature limit is such that when preheating petrochemical fuels, a safe temperature below the ignition point must be set; when using water as a material, the maximum preheating temperature before entering the heating furnace generally does not exceed 90°C; pressure limits are a direct safety-related limiting factor), power allocation strategies, and Formula 3, the new energy power is allocated; since there are countless power allocation options, in actual engineering, the allocation principle or scheme is determined based on the physical configuration of the heating unit, its respective electric heating efficiency and its role in the system, the allowable adjustable range of power, and other factors.

[0058] When the power output of the new energy source (after efficiency conversion, the same below) is greater than or equal to the design power output requirement of the large heating furnace, the corresponding M air and M fuel The value corresponding to zero or minimum combustion; when P new When the value is also 0, the system is equivalent to a single petrochemical fuel heating system.

[0059] Secondly, for situations where mains power is available (such as during off-peak hours, where cost optimization rules might prioritize the use of renewable energy sources with mains power supplementing any shortfall), the control strategy is relatively simple. air and M fuel The value corresponding to zero or minimum combustion is a definite value, representing the portion of energy demand that is insufficient due to insufficient renewable energy supply from the mains power supply; then, the power is allocated according to the power distribution strategy and formula 3, generally with each electric heating unit operating at full power (rated power); when M fuel When the value is 0, the system is equivalent to a single electric heating system.

[0060] Preferably, the power allocation strategy includes a proportional allocation strategy, a priority allocation strategy, or an efficiency allocation strategy; this embodiment adopts a proportional allocation strategy.

[0061] The proportional allocation strategy includes allocating power proportionally within the upper limit of the power of each electric heating unit. The specific ratio can be determined according to the actual situation of the large heating furnace. Factors to be considered include the maximum allowable power, rated power, electric heater type, corresponding installation location and its actual installation structure (affecting heat transfer efficiency), and energy loss along the medium transmission path of each electric heating unit. Under normal circumstances, heating can be carried out in equal proportions of the maximum allowable power or rated power (i.e., the heating power of each unit accounts for the same proportion of its maximum allowable power or rated power). The maximum allowable power includes the smaller of the maximum allowable power of the electric heater and the heating power corresponding to the highest heating temperature of the heated medium. In this embodiment, the electric power is allocated according to the strategy of equal proportional heating based on the rated power. Preferably, the coordinated control method of the main body and auxiliary heating further includes: When the measured output power of the large heating furnace is P C_out With design requirements P D_out When deviations occur, traditional control methods adjust the material feed rate, combustion air intake rate, and petrochemical fuel intake rate in real time based on the magnitude of the deviation and combustion efficiency. The basic principle of this invention is similar, but the difference lies in that it adjusts the input of petrochemical fuel based on the actual amount of electricity and petrochemical fuel used, while meeting boundary conditions. If energy output needs to be reduced, the petrochemical fuel energy input is reduced first; if energy output needs to be increased, the electrical energy input is increased first. Then, the changes in petrochemical fuel and electrical power are calculated according to the principles of Formulas 1 to 3, and finally, corresponding control commands are issued through the control subsystem.

[0062] Example 7: The difference from Example 6 is that this example is for an integrated system with two or more large heating furnaces, and for P ACIn the case of =0, the new energy power can be allocated proportionally according to the rated output power of each large heating furnace before executing the solution and power allocation process for a single heating furnace as described in Example 6 above. Alternatively, a new energy power supply priority can be defined for each large heating furnace, and power can be supplied at full power sequentially according to priority (at this time, the M corresponding to the large heating furnace). air and M fuel (The value corresponding to zero or minimum combustion amount) is used for the part that is less than full power, and the above solution and power allocation process is performed for a single heating furnace. Although, theoretically, when the supply of new energy power exceeds the power demand of all heating furnaces, the phenomenon of "curtailment of solar and wind power" will also occur, in fact, the installed capacity of new energy near large industrial and mining enterprises is far from meeting their actual power consumption needs.

[0063] In situations where mains power is available, integrated systems with two or more large heating furnaces can also operate at full power.

[0064] Example 8: The difference from Example 6 is that this example uses a priority allocation strategy.

[0065] The priority allocation strategy includes pre-defining the priority of each electric heating unit. Units with higher priority are heated at full power first. Full power generally refers to rated power, which is less than or equal to its maximum power. In this embodiment, the electric heating unit of the furnace body is defined as the highest priority (first priority). The electric insulation unit at the material outlet, the electric preheating unit at the material inlet, the electric preheating unit at the combustion air, and the electric preheating unit at the petrochemical fuel are respectively the second to fifth priorities. Of course, combined priorities can also be defined, such as the electric heating unit of the furnace body being the first priority, the electric insulation unit at the material outlet being allocated power, the electric preheating unit at the material inlet being allocated power, the electric preheating unit at the combustion air being the second priority, the electric preheating unit at the petrochemical fuel being the third priority, and so on. Example 9: The difference from Example 6 is that this example adopts an efficiency allocation strategy.

[0066] The efficiency allocation strategy includes defining the power allocation ratio based on the individual heating efficiency of each electric heating unit. Under the premise of meeting boundary conditions, the higher the efficiency of a unit, the higher its power allocation ratio, until its rated power value is reached. Due to factors such as heater installation location, structure, and environmental heat loss, the efficiency of different electric heating units varies. When design or modification site conditions permit, they can generally approach the optimal heating efficiency, resulting in minimal difference in the actual efficiency of each electric heating unit. However, when site engineering conditions are not suitable, the heating efficiency of each unit may differ significantly. In this case, prioritizing the allocation of power to the more efficient unit is more reasonable and economical.

[0067] The above description is only a partial and relatively comprehensive embodiment of a new energy virtual storage system of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention. For example, the selection of different types of heating furnaces, the combination of non-electric heating units, the selection of a separate new energy power supply method or a separate mains power supply method (generally off-peak electricity, which can also reduce costs and save fossil fuels; the specific implementation only needs to be simply reduced based on embodiment 1), and the selection of heating switching equipment and switching method when choosing a combination of mains power and new energy power supply, the source of new energy, the use of deviation control method during collaborative control, and the use of different power distribution strategies for electric heating units, etc. These combinations or preferred solutions should also be considered within the scope of protection of the present invention, and will not be listed one by one here.

Claims

1. A new energy virtual energy storage system, characterized in that, The new energy power does not need to be connected to the grid. The virtual storage system includes a large heating furnace (F1) and its petrochemical fuel heating subsystem (F2), electric heating subsystem and control subsystem (K1). The petrochemical fuel heating subsystem (F2), electric heating subsystem and control subsystem are electrically connected. The electric heating subsystem includes at least one of the following: heating furnace body electric heating unit (R1), material inlet electric preheating unit (R2), material outlet electric insulation unit (R3), combustion air electric preheating unit (R4) and petrochemical fuel electric preheating unit (R5), which are respectively installed in the heating medium flow or buffer part of the corresponding pipeline or furnace of the heating furnace. The control subsystem includes a detection unit and a collaborative control unit. The detection unit includes at least sensors or instruments for detecting medium temperature, medium flow rate, and power consumption. The power source for the electric heating subsystem includes direct power supply from new energy sources and / or mains power supply.

2. The new energy virtual storage system according to claim 1, characterized in that, The power detection items include at least one of current, voltage, or power; the measured object of the power detection includes at least the power generation of new energy sources.

3. The new energy virtual storage system according to claim 1, characterized in that, The medium includes materials, combustion air, or petrochemical fuels; the mains power supply for the electric heating subsystem includes off-peak electricity supply.

4. The new energy virtual storage system according to claim 1, characterized in that, The large heating furnace includes at least one of a boiler, a steam superheater, an annealing furnace, a natural gas furnace, and a pyrolysis furnace; the virtual storage system includes a new energy power virtual storage system composed of two or more large heating furnaces, with the petrochemical fuel heating subsystem and electric heating subsystem corresponding to each large heating furnace being independently arranged; the control subsystem includes a control subsystem independently set up for each large heating furnace or a control subsystem integrated with several large heating furnaces.

5. A new energy virtual storage system according to claim 1, characterized in that, The new energy sources include solar, wind, tidal, or wave energy.

6. A new energy virtual storage system according to claim 1, characterized in that, When both mains power and new energy sources are used for power supply, the electric heating subsystem includes either design mode one or design mode two; The design mode one includes two sets of heating devices for each electric heating unit: one for mains power heating and one for new energy power supply heating. Each device is controlled by a control subsystem for switching and power adjustment. The second design mode involves connecting the mains power and the new energy power supply respectively through a single-pole double-throw or double-pole double-throw switch before connecting the heating device.

7. A new energy virtual storage system according to any one of claims 1 to 6, characterized in that, The collaborative control method of the virtual storage system includes a furnace body collaborative control method or a furnace body and auxiliary heating collaborative control method.

8. A new energy virtual storage system according to claim 7, characterized in that, The furnace body coordinated control method includes: The output power requirement of the target material is calculated and denoted as P. D_out Specific heat of combustion air C air The inlet combustion air temperature is T air The mass flow rate is M air The ignition temperature of petrochemical fuels is T. fire Specific heat of petrochemical fuels C fuel The inlet petrochemical fuel temperature is T. fuel The mass flow rate is M fuel Heat release energy per unit mass of fossil fuel combustion (W) fuel Real-time power supply of new energy power P new Real-time power supply P from mains power AC ; Among them, according to the petrochemical fuel combustion equation, M air and M fuel There exists a definite proportional relationship between them, let the proportionality coefficient be k1; that is... （1） According to the law of conservation of energy, we have （2） in, For the combustion efficiency of fossil fuels, For electric heating efficiency, all are known quantities; First, for P AC =0, based on the power supply capacity P of new energy power new Solve M by combining Equations 1 and 2. air and M fuel ; Secondly, for situations where mains power is available, M air and M fuel The value corresponding to zero or minimum combustion is the portion of the energy demand that is insufficient for renewable energy supply in order to supplement the mains power supply.

9. A new energy virtual storage system according to claim 7, characterized in that, The method for coordinated control of the main body and auxiliary heating includes: The output power requirement of the target material is calculated and denoted as P. D_out Specific heat of combustion air C air The inlet combustion air temperature is T air The mass flow rate is M air The ignition temperature of petrochemical fuels is T. fire Specific heat of petrochemical fuels C fuel The inlet petrochemical fuel temperature is T. fuel The mass flow rate is M fuel Heat release energy per unit mass of fossil fuel combustion (W) fuel Real-time power supply of new energy power P new Real-time power supply P from mains power AC ; Among them, according to the petrochemical fuel combustion equation, M air and M fuel There exists a definite proportional relationship between them, let the proportionality coefficient be k1; that is... （1） According to the law of conservation of energy, we have （2） in, For the combustion efficiency of fossil fuels, For electric heating efficiency, all are known quantities; According to the power distribution scheme, there are （3） Wherein, P1 is the power allocated to the electric heating unit of the furnace body, P2 is the power allocated to the electric preheating unit of the material inlet, P3 is the power allocated to the electric insulation unit of the material outlet, P4 is the power allocated to the electric preheating unit of the combustion air, and P5 is the power allocated to the electric preheating unit of the petrochemical fuel. First, for P AC =0, based on the power supply capacity P of new energy power new Solve M by combining Equations 1 and 2. air and M fuel Then, the power of the new energy source is allocated according to the boundary conditions, power allocation strategy, and Formula 3. Secondly, for situations where mains power is available, M air and M fuel The value corresponding to zero or minimum combustion is the portion of the energy demand that is insufficient for renewable energy supply in the mains power supply; then the power is allocated according to the power allocation strategy and formula 3.

10. A new energy virtual storage system according to claim 9, characterized in that, The power allocation strategy includes a proportional allocation strategy, a priority allocation strategy, or an efficiency allocation strategy. The proportional allocation strategy includes a strategy of allocating power proportionally within the upper limit of the power of each electric heating unit. The priority allocation strategy includes pre-defining the priority of each electric heating unit, with higher priority units heating at full power first; The efficiency allocation strategy includes defining the power allocation ratio based on the individual electric heating efficiency of each electric heating unit. Under the premise of meeting the boundary conditions, the higher the efficiency of the unit, the higher the power allocation ratio it receives, until it reaches its rated power value.

11. A new energy virtual storage system according to claim 8, characterized in that, The combined control method of body and auxiliary heating also includes: When the measured output power of the large heating furnace is P C_out With design requirements P D_out When a deviation occurs, based on the actual amount of electricity and petrochemical fuel used, and under the premise of meeting the boundary conditions, if it is necessary to reduce energy output, then the petrochemical fuel energy input should be reduced first; if it is necessary to increase energy output, then the electrical energy input should be increased first. Then, the changes in petrochemical fuel and electrical power are calculated according to the principles of Formulas 1 to 2, and finally, the corresponding control commands are issued through the control subsystem.

12. A new energy virtual storage system according to claim 9 or 10, characterized in that, The combined control method of body and auxiliary heating also includes: When the measured output power of the large heating furnace is P C_out With design requirements P D_out When a deviation occurs, based on the actual amount of electricity and petrochemical fuel used, and under the premise of meeting the boundary conditions, if it is necessary to reduce energy output, then the petrochemical fuel energy input should be reduced first; if it is necessary to increase energy output, then the electrical energy input should be increased first. Then, the changes in petrochemical fuel and electrical power are calculated according to the principles of Formulas 1 to 3, and finally, the corresponding control commands are issued through the control subsystem.

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