A molten salt energy storage electric heating system

Abstract

The present application discloses a molten salt energy storage electric heating system, which relates to the technical field of molten salt energy storage. The method includes: an effect module, which obtains the geographical environment of molten salt energy storage, analyzes the heat storage effect of different types of molten salt components and marks them as component effects; a cost module, which analyzes the cost consumption of different types of molten salt energy storage components and records them as cost consumption; an environmental protection module, which analyzes the environmental protection conditions of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and records them as environmental protection conditions; a proportion module, which calculates the suitability of different types of molten salt energy storage components, determines the proportion of different types of molten salt energy storage components according to the suitability of different molten salt energy storage components and records them as molten salt components; a demand module, which obtains the actual heating demand and calculates the actual demand situation; a scheduling module, which schedules the stored heat according to the demand situation. The present application improves the efficiency of the molten salt energy storage electric heating system.

Description

Technical Field

[0001] The present application relates to the technical field of molten salt energy storage, and in particular to a molten salt energy storage electric heating system. Background Art

[0002] Molten salt energy storage electric heating is a sensible heat storage technology that uses molten salt as a heat transfer medium. Molten salt refers to a liquid mixture formed by the melting of certain salts at high temperatures, such as halides, nitrates, sulfates, etc. of alkali metals and alkaline earth metals. This substance has the characteristics of high boiling point, low viscosity, low vapor pressure and high volume heat, making it an excellent heat transfer and storage medium. Molten salt energy storage technology has many advantages, such as low saturated vapor pressure, good high temperature stability, low viscosity and large specific heat capacity, so it is suitable for large-scale, long-term medium and high temperature heat storage. The molten salt heat storage system can not only be used for solar thermal power generation, but also can be used in many fields such as flexibility transformation of thermal power plants, waste heat recovery, clean heating, etc. It is one of the key technologies for building new energy storage systems in the future.

[0003] In the related art, the mode of using molten salt energy storage in different scenarios is single, resulting in that the performance of molten salt energy storage cannot be fully utilized when used in some scenarios, and the efficiency of molten salt energy storage is relatively low, and there is room for improvement. Summary of the invention

[0004] The object of the present invention is to provide a molten salt energy storage electric heating system to solve the problems raised in the above background technology.

[0005] The present application provides a molten salt energy storage electric heating system, which adopts the following technical solution:

[0006] Effect module, obtains the geographical environment of molten salt energy storage, analyzes the heat storage effects of different types of molten salt components according to the geographical environment of molten salt energy storage and marks them as component effects , where m is the number of different types of molten salt components;

[0007] Cost module, which analyzes the cost consumption of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and records it as cost consumption , where m is the number of different types of molten salt components;

[0008] Environmental protection module, which analyzes the environmental protection status of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and records it as environmental protection status , where m is the number of different types of molten salt components;

[0009] The proportion module is connected to the effect module, the cost module and the environmental protection module for receiving the component effect , the cost consumption And the environmental protection situation , calculating the suitability of different types of molten salt energy storage components, and determining the proportions of different types of molten salt energy storage components according to the suitability of different molten salt energy storage components and recording them as molten salt components;

[0010] A demand module, which is connected to the proportional module signal, is used to receive the molten salt composition, obtain the actual heating demand, and calculate the actual demand situation;

[0011] A scheduling module is connected to the demand module signal, and is used to receive the demand situation and schedule the stored thermal energy according to the demand situation.

[0012] By adopting the above technical solution, in different usage scenarios, the effects, costs and environmental protection conditions of different molten salt energy storage components are analyzed according to the actual geographical environment, and more suitable molten salt energy storage components are set according to the actual heating demand, thereby improving the efficiency of the molten salt energy storage electric heating system.

[0013] Preferably, the effect module obtains the geographical environment of molten salt energy storage, analyzes the heat storage effects of different types of molten salt components according to the geographical environment of molten salt energy storage and marks them as component effects. , where m is the numbering step of different types of molten salt components, specifically:

[0014] Obtaining the geographical environment of molten salt energy storage, wherein the geographical environment includes average temperature BW, average humidity BS and average light BG;

[0015] Obtaining a suitable environment for different types of molten salt components, the suitable environment includes a suitable temperature , Suitable humidity Suitable lighting , where m is the number of different types of molten salt components;

[0016] Obtaining the initial heat storage effect of different types of molten salt compositions , where m is the number of different types of molten salt components;

[0017] According to the heat storage effect correlation function Calculate the compositional effects of different types of molten salt compositions , where m is the number of different types of molten salt components, , , is the scaling factor and is greater than 0.

[0018] By adopting the above technical solution, the heat storage effects of different types of molten salt energy storage components are analyzed according to temperature, humidity and light, which is conducive to selecting molten salt energy storage components that are more suitable for the usage scenario, thereby improving the application effect of the molten salt energy storage system and improving the efficiency of the molten salt energy storage electric heating system.

[0019] Preferably, the cost module analyzes the cost consumption of different types of molten salt energy storage components according to the geographical environment of the molten salt energy storage and records it as cost consumption , where m is the numbering step of different types of molten salt components, specifically:

[0020] Cost of obtaining different types of molten salt energy storage components , where m is the number of different types of molten salt components;

[0021] Based on the average temperature BW, a negative correlation curve between the average temperature and the stability of different types of molten salt energy storage components is established, and the stability of different types of molten salt energy storage components is obtained according to the negative correlation curve between the average temperature and the stability of different types of molten salt energy storage components. , where m is the number of different types of molten salt components;

[0022] Obtaining the thermophysical properties of different types of molten salt energy storage components , where m is the number of different types of molten salt components;

[0023] Consumption-related functions based on cost Calculate the cost of different types of molten salt energy storage components , where m is the number of different types of molten salt components, , are different scale factors and are greater than 0.

[0024] By adopting the above technical scheme, the cost and consumption of molten salt energy storage components are analyzed according to the cost of different types of molten salt energy storage components, the stability of components affected by temperature, and thermophysical properties, which is conducive to selecting lower-cost molten salt energy storage components and reducing the cost of the molten salt energy storage electric heating system.

[0025] Preferably, the steps of calculating the suitability of different types of molten salt energy storage components, determining the proportions of different types of molten salt energy storage components according to the suitability of different molten salt energy storage components and recording them as molten salt components, are specifically:

[0026] According to the fitness correlation function Calculate the suitability of different types of molten salt energy storage components , where m is the number of different types of molten salt components, , , is the scale factor and is greater than 0;

[0027] According to the suitability of different types of molten salt energy storage components Form weighted percentages and label them as primary proportions;

[0028] Based on the primary ratio, the use environment of the molten salt energy storage is obtained, and the heat storage amount is obtained according to the use environment analysis of the molten salt energy storage;

[0029] Based on the heat storage, historical heating demand is obtained, and the weight percentage is adjusted according to the historical heating demand and recorded as the molten salt composition.

[0030] Through the above technical scheme, the heat storage effect, cost consumption and environmental protection of the molten salt energy storage components are comprehensively considered, the suitability of different types of molten salt energy storage components is analyzed, the proportion of molten salt energy storage components is set, and the proportion is adjusted according to the actual heating demand. A more suitable molten salt energy storage component is set, thereby improving the efficiency of the molten salt energy storage electric heating system.

[0031] Preferably, based on the primary ratio, the use environment of the molten salt energy storage is obtained, and the steps of analyzing the use environment of the molten salt energy storage to obtain the heat storage amount are specifically as follows:

[0032] Obtaining the use environment of molten salt energy storage, wherein the use environment includes pressure EY, pH value EP, water storage capacity EZ and chemical reaction conditions EH;

[0033] Obtain standard operating environments for different types of molten salt energy storage components, including standard pressure , Standard pH value and water consumption ;

[0034] Obtain the total amount of molten salt for molten salt energy storage, and calculate the initial heat storage capacity of the molten salt according to the primary ratio ;

[0035] According to the heat storage correlation function The heat storage EC is calculated as follows: , , is the scaling factor and is greater than 0.

[0036] By adopting the above technical scheme, the heat storage capacity of the molten salt energy storage component under the primary ratio is calculated according to the actual use pressure, pH value, water consumption and chemical reaction conditions of the molten salt energy storage system. The heat storage capacity calculated according to actual use will be more accurate, thereby improving the accuracy of the molten salt energy storage electric heating system.

[0037] Preferably, the steps of the chemical reaction situation EH are specifically:

[0038] Based on the primary ratio, different types of molten salt energy storage components that will react are screened to form different reaction combinations;

[0039] Based on the different reaction combinations, the reaction intensity of different reaction combinations is obtained. , where n is the number of different reaction combinations;

[0040] Based on the total molten salt amount of the molten salt energy storage and the primary ratio, the reaction range of different reaction combinations is obtained according to the amount of different reaction combinations. , where n is the number of different reaction combinations;

[0041] According to the reaction correlation function The chemical reaction situation EH is calculated, where n is the number of different reaction combinations.

[0042] By adopting the above technical scheme, the reaction conditions of different chemical reaction combinations in the molten salt energy storage components are comprehensively analyzed according to the reaction intensity of different chemical reaction combinations and the reaction range obtained according to the reaction amount. Finally, the reaction conditions of all chemical reaction combinations are superimposed to obtain the total chemical reaction condition, thereby improving the reliability of the molten salt energy storage electric heating system.

[0043] Preferably, based on the heat storage, the historical heating demand is obtained, and the weight percentage is adjusted according to the historical heating demand and recorded as the molten salt composition, specifically, the steps are:

[0044] Based on the heat storage, historical heating demand is obtained, and the difference between the heat storage and historical heating demand is calculated and recorded as a first demand difference;

[0045] Based on the first demand difference, setting a demand difference threshold, and if the first demand difference is not greater than 0, comparing the first demand difference with the demand difference threshold;

[0046] If the first demand difference is greater than the demand difference threshold, setting the molten salt energy storage composition at the primary ratio and recording it as the molten salt composition;

[0047] If the first demand difference is not greater than the demand difference threshold, then according to the component effect Sort different types of molten salt energy storage components from high to low and record them as sorted data;

[0048] Based on the sorting data, an adjustment ratio is set, and the molten salt energy storage component with the highest component effect is increased according to the adjustment ratio, and the molten salt energy storage component with the lowest component effect is decreased according to the adjustment ratio to form an intermediate ratio;

[0049] Based on the intermediate ratio, the heat storage value of the molten salt energy storage is calculated, a second demand difference is calculated according to the historical heating demand, and a comparison is made as to whether the second demand difference is greater than a demand difference threshold value;

[0050] If the second demand difference is greater than the demand difference threshold, the molten salt composition is obtained by setting the intermediate ratio;

[0051] If the second demand difference is not greater than the demand difference threshold, the new ratio is formed after adjustment again according to the adjustment ratio.

[0052] By adopting the above technical solution, according to the heating demand, it is analyzed whether the proportion setting of the molten salt energy storage component can meet the heating demand. If the heating demand cannot be met, the proportion is adjusted repeatedly and slightly until the heating demand is met. The molten salt energy storage component is set according to the proportion, thereby improving the efficiency of the molten salt energy storage electric heating system.

[0053] Preferably, the step of obtaining the actual heating demand and calculating the actual demand is specifically as follows:

[0054] Obtain real-time heating demand NG and temperature changes;

[0055] Based on the temperature change, a negative correlation curve between historical temperature and historical heating demand is obtained, and a heating demand fluctuation value NB is predicted according to the negative correlation curve between historical temperature and historical heating demand;

[0056] Obtain the historical heating change curve and find the historical maximum heating fluctuation value ND;

[0057] Associative functions according to requirements The actual demand situation NQ is calculated.

[0058] By adopting the above technical solution, the actual heating demand is comprehensively analyzed according to the real-time heating demand, the fluctuation of heating demand caused by temperature changes and the maximum fluctuation value in the historical usage records, so as to reduce the occurrence of heating not meeting user needs and improve the user experience of the molten salt energy storage electric heating system.

[0059] Preferably, the scheduling module is connected to the demand module signal, and is used to receive the demand situation and schedule the steps of storing thermal energy according to the demand situation, specifically:

[0060] Based on the actual demand situation NQ, the actual heating amount is obtained, and the difference between the actual heating amount and the actual demand situation is calculated and recorded as the actual heating difference;

[0061] Based on the actual heating difference, the power supply situation during the heating period is obtained to determine whether the power supply situation is in a peak period;

[0062] If the power supply is at a peak period, the heat energy of the actual heating difference is connected to the heat energy conversion device and then to the power grid for power generation;

[0063] If the power supply is not at a peak period, the heat energy of the actual heating difference is connected to the thermal energy conversion device and connected to the energy storage battery to store the electricity and use it for the next electric heating.

[0064] By adopting the above technical solution, the excess heating capacity is converted into electrical energy through a thermal energy conversion device. According to the time when the electricity is generated, the electricity is allocated for use in the power grid or for storage in energy storage batteries, thereby reducing the waste of thermal energy resources and improving the resource utilization rate of the molten salt energy storage electric heating system.

[0065] Preferably, if the power supply situation is not at a power supply peak period, the step of connecting the heat energy of the actual heating difference to the heat energy conversion device and connecting it to the energy storage battery to store the electricity and use it for the next electric heating is specifically:

[0066] The energy loss rate of the heat energy conversion device is obtained, and the actual energy storage electric energy is calculated based on the heat energy of the actual heating difference and the energy loss rate of the heat energy conversion device;

[0067] Based on the molten salt composition and the total molten salt amount of the molten salt energy storage, electric heating energy is calculated;

[0068] Determine whether the actual energy storage electric energy is not less than the electric heating electric energy. If the actual energy storage electric energy is not less than the electric heating electric energy, start the energy storage battery for electric heating in the electric heating stage;

[0069] If the actual energy storage power is less than the electric heating power, it is determined whether it is in the power supply valley period. If it is in the power supply valley period, the energy storage battery and the power grid are started to perform electric heating together;

[0070] If it is not in the power supply valley period, the required operating temperature is obtained, and the actual operating temperature of the energy storage battery heating is calculated, and the temperature difference threshold is set to determine whether the difference between the actual operating temperature of the energy storage battery heating and the required operating temperature reaches the temperature difference threshold;

[0071] If the difference between the actual working temperature of the energy storage battery heating and the required working temperature does not reach the temperature difference threshold, the energy storage battery is started for electrical heating;

[0072] If the difference between the actual operating temperature of the energy storage battery heating and the required operating temperature reaches the temperature difference threshold, the energy storage battery and the backup battery are started to be electrically heated together.

[0073] Through the above technical scheme, during the molten salt energy storage electric heating stage, according to the power demand and the storage power of the energy storage battery, combined with the power grid and backup batteries, a more reasonable electric heating method is arranged to reduce the impact on users and improve the convenience of the molten salt energy storage electric heating system.

[0074] In summary, the present application includes at least one of the following beneficial technical effects:

[0075] 1. In different usage scenarios, the effects, costs and environmental protection of different molten salt energy storage components are analyzed according to the actual geographical environment. According to the actual heating demand, more suitable molten salt energy storage components are set to improve the efficiency of the molten salt energy storage electric heating system.

[0076] 2. According to the actual use pressure, pH value, water consumption and chemical reaction conditions of the molten salt energy storage system, the heat storage capacity of the molten salt energy storage component under the primary ratio is calculated. The heat storage capacity calculated based on actual use will be more accurate, which improves the accuracy of the molten salt energy storage electric heating system.

[0077] 3. According to the reaction intensity of different chemical reaction combinations in the molten salt energy storage components and the reaction range obtained according to the reaction amount, the reaction conditions of different chemical reaction combinations are comprehensively analyzed. Finally, the reaction conditions of all chemical reaction combinations are superimposed to obtain the total chemical reaction condition, which improves the reliability of the molten salt energy storage electric heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 It is a schematic diagram of specific module connections of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0079] Figure 2 It is a schematic diagram of specific steps of an effect module of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0080] Figure 3 It is a schematic diagram of specific steps of a cost module of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0081] Figure 4 It is a schematic diagram of specific steps of a proportional module of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0082] Figure 5 It is a schematic diagram of specific steps of step 43 of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0083] Figure 6 It is a schematic diagram of specific steps of step 431 of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0084] Figure 7It is a schematic diagram of specific steps of step 44 of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0085] Figure 8 It is a schematic diagram of specific steps of a demand module of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0086] Fig. 9 It is a schematic diagram of specific steps of a scheduling module of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0087] Fig.10 It is a schematic diagram of specific steps of step 64 of an embodiment of a molten salt energy storage electric heating system of the present invention;

[0088] Explanation of the accompanying drawings: 1. Effect module; 2. Cost module; 3. Environmental protection module; 4. Ratio module; 5. Demand module; 6. Scheduling module. DETAILED DESCRIPTION

[0089] Below is a combination of the embodiments and the attached Figure 1-9 The present invention is further described in detail, but the embodiments of the present invention are not limited thereto. Example

[0090] The present invention discloses a molten salt energy storage electric heating system, referring to Figure 1 , specifically including the following steps:

[0091] Effect module, obtains the geographical environment of molten salt energy storage, analyzes the heat storage effects of different types of molten salt components according to the geographical environment of molten salt energy storage and marks them as component effects , where m is the number of different types of molten salt components.

[0092] Cost module, which analyzes the cost consumption of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and records it as cost consumption , where m is the number of different types of molten salt components.

[0093] Environmental protection module, which analyzes the environmental protection status of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and records it as environmental protection status , where m is the number of different types of molten salt components.

[0094] It should be noted that the environmental protection situation is obtained based on the degree of environmental pollution caused by the historical use of molten salt energy storage components.

[0095] Proportional module, which is connected to the effect module, cost module and environmental protection module, is used to receive component effects. , cost consumption And environmental protection , calculate the suitability of different types of molten salt energy storage components, and determine the proportion of different types of molten salt energy storage components according to the suitability of different molten salt energy storage components, which is denoted as the molten salt composition.

[0096] A demand module, which is signal-connected to the proportion module, is used to receive the molten salt composition, obtain the actual heating demand, and calculate the actual demand situation.

[0097] A scheduling module, which is signal-connected to the demand module, is used to receive the demand situation and schedule the stored thermal energy according to the demand situation.

[0098] In actual application, using the same molten salt energy storage components in different scenarios cannot maximize the effect of molten salt energy storage. According to the geographical environment in different scenarios, analyze the effects, costs, environmental protection, and user needs of different molten salt components, and comprehensively set the proportion of molten salt components for molten salt energy storage, which can give better play to the use effect of molten salt energy storage and improve the efficiency of molten salt energy storage. For example, nitrate in the molten salt composition has unique semi-volatility, its thermodynamic equilibrium is extremely unstable, and it is greatly affected by temperature and humidity. At night, higher relative humidity and lower temperature may lead to a higher concentration than during the day, which has a direct impact on the energy storage and release of the molten salt energy storage system. Therefore, in the usage scenarios of high humidity and low temperature, it is not suitable to use too much nitrate.

[0099] Refer to Figure 2 , an effect module, obtains the geographical environment of the molten salt energy storage, analyzes the heat storage effects of different types of molten salt components according to the geographical environment of the molten salt energy storage, and marks them as component effects , where m is the number of different types of molten salt components, the specific steps are as follows:

[0100] Step S11, obtain the geographical environment of the molten salt energy storage, where the geographical environment includes the average temperature BW, the average humidity BS, and the average sunlight BG.

[0101] The average temperature, average humidity, and average sunlight are obtained through historical weather information.

[0102] Step S12, obtain the suitable environment for different types of molten salt components, where the suitable environment includes the suitable temperature , the suitable humidity , and the suitable sunlight , where m is the number of different types of molten salt components.

[0103] The suitable environment for different types of molten salt components is obtained by looking up the characteristics of the molten salt components.

[0104] Step S13, obtain the initial heat storage effect of different types of molten salt components , where m is the number of different types of molten salt components.

[0105] The initial heat storage effects of different types of molten salt compositions are obtained through historical usage records.

[0106] Step S14: according to the heat storage effect correlation function Calculate the compositional effects of different types of molten salt compositions , where m is the number of different types of molten salt components, , , is the scaling factor and is greater than 0.

[0107] In actual use, there are many kinds of molten salt components in molten salt energy storage, such as halides of alkali metals and alkaline earth metals, nitrates, sulfates, etc. Different types of molten salt components are suitable for different use environments. Therefore, in different geographical environments, different types of molten salt components are affected to different degrees, and the heat storage effects presented are naturally different. For example, the molten salt energy storage system relies on the melting and solidification process of molten salt to store and release energy, and the temperature conditions in the geographical environment will directly affect the state of the molten salt and the energy storage efficiency. Therefore, in cold areas, molten salt components with higher melting points are more difficult to melt, which will affect the thermal energy storage of the molten salt, resulting in the molten salt energy storage system The efficiency is too low.

[0108] Reference Figure 3 , cost module, analyzes the cost consumption of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and records it as cost consumption , where m is the numbering step of different types of molten salt components, specifically:

[0109] Step S21, obtaining the cost of different types of molten salt energy storage components , where m is the number of different types of molten salt components.

[0110] The costs of different types of molten salt energy storage components are obtained based on historical usage records.

[0111] Step S22: based on the average temperature BW, establish a negative correlation curve between the average temperature and the stability of different types of molten salt energy storage components, and obtain the stability of different types of molten salt energy storage components according to the negative correlation curve between the average temperature and the stability of different types of molten salt energy storage components. , where m is the number of different types of molten salt components.

[0112] Step S23, obtaining the thermal properties of different types of molten salt energy storage components , where m is the number of different types of molten salt components.

[0113] The thermophysical properties of different types of molten salt energy storage components are obtained by looking up the molten salt composition characteristics.

[0114] Step S24: according to the cost consumption correlation function Calculate the cost of different types of molten salt energy storage components , where m is the number of different types of molten salt components, , are different scale factors and are greater than 0.

[0115] In actual application, when using a molten salt energy storage electric heating system, it is necessary to build a molten salt energy storage electric heating system first, so the cost of molten salt energy storage needs to be considered. Different molten salt components have different heat storage effects and different costs. The melting point, specific heat capacity, thermal conductivity and other thermophysical parameters of the molten salt directly affect the operating efficiency of the heat storage system. For example, a high melting point may cause the system to require more energy to maintain the liquid state of the molten salt, while a low specific heat capacity means that less heat is stored per unit mass of molten salt, which may cause the energy storage system to require more molten salt materials, thereby increasing costs and floor space. In addition, the molten salt energy storage components themselves also have price differences, and because of the instability of the molten salt energy storage components, the material will have a certain loss, increasing the cost consumption during the use of molten salt energy storage.

[0116] Reference Figure 4 , calculating the suitability of different types of molten salt energy storage components, determining the proportions of different types of molten salt energy storage components according to the suitability of different molten salt energy storage components and recording them as the steps of molten salt components, specifically:

[0117] Step S41, according to the fitness correlation function Calculate the suitability of different types of molten salt energy storage components , where m is the number of different types of molten salt components, , , is the scaling factor and is greater than 0.

[0118] Step S42, according to the suitability of different types of molten salt energy storage components The weighted percentages are formed and labeled as primary proportions.

[0119] Step S43, based on the primary ratio, obtaining the use environment of the molten salt energy storage, and obtaining the heat storage amount according to the use environment analysis of the molten salt energy storage.

[0120] Step S44, based on the heat storage, obtain the historical heating demand, adjust the weight percentage according to the historical heating demand and record it as the molten salt composition.

[0121] In actual application, different types of molten salt energy storage components have different advantages. Some molten salt energy storage components have low cost, some molten salt energy storage components have good effects, and some molten salt energy storage components are more environmentally friendly. Therefore, it is necessary to make a comprehensive consideration to find the appropriate molten salt energy storage components for configuration. For the molten salt components configured according to the suitability, it is necessary to calculate the heat storage capacity, verify whether it can meet the heating needs of the region, and determine the final molten salt energy storage components. For example, the molten salt energy storage components configured according to the suitability are 50% sulfate, 30% nitrate, and 20% alkali metal. However, in fact, the heat storage capacity does not meet the heating demand. At this time, as soon as possible, this ratio is the most suitable molten salt energy storage component ratio. When there is no way to meet the heating demand, the actual application effect of the molten salt energy storage system is very poor. Therefore, it is necessary to sacrifice the cost and environmental protection, adjust the ratio of molten salt energy storage components, and improve the efficiency of molten salt energy storage.

[0122] Reference Figure 5 Based on the primary ratio, the use environment of molten salt energy storage is obtained, and the steps for obtaining the heat storage amount are analyzed according to the use environment of molten salt energy storage, specifically:

[0123] Step S431, obtaining the use environment of molten salt energy storage, the use environment including pressure EY, pH value EP, water storage capacity EZ and chemical reaction conditions EH.

[0124] The usage environment is obtained through operation records.

[0125] Step S432, obtaining standard use environments of different types of molten salt energy storage components, the standard use environment including standard pressure , Standard pH value and water consumption .

[0126] The standard use environment is obtained by finding the characteristics of different types of molten salt energy storage components.

[0127] Step S433, obtain the total amount of molten salt for molten salt energy storage, and calculate the initial heat storage capacity of the molten salt according to the primary ratio .

[0128] The total amount of molten salt for molten salt energy storage is obtained according to the amount of molten salt set by the user.

[0129] Step S434, according to the heat storage correlation function The heat storage EC is calculated as follows: , , is the scaling factor and is greater than 0.

[0130] In actual application, for molten salt, changes in pressure may affect its physical and chemical properties, such as density, viscosity and conductivity, thus affecting the heat storage efficiency of molten salt energy storage. The pH of the solution will also affect the solubility of these salts. For example, nitrates are more stable in acidic environments, while sulfates may be more prone to chemical reactions in alkaline environments. Similarly, the components of molten salt energy storage are also affected by light. Some nitrates and halides will decompose under light, which will affect their chemical stability. Of course, chemical reactions will also occur between the components of molten salt, thereby changing the solubility and reactivity of these salts, ultimately affecting the heat storage capacity.

[0131] Reference Figure 6 , the steps of chemical reaction situation EH are:

[0132] Step S4311, based on the primary ratio, screen different types of molten salt energy storage components that will react to form different reaction combinations.

[0133] Step S4312, based on different reaction combinations, obtaining the reaction intensity of different reaction combinations , where n is the number of different reaction combinations.

[0134] It should be noted that the reaction intensity of different reaction combinations is obtained based on existing experimental data.

[0135] Step S4313, based on the total molten salt amount and primary ratio of the molten salt energy storage, the reaction range of different reaction combinations is obtained according to the amount of different reaction combinations , where n is the number of different reaction combinations.

[0136] Step S4314, according to the reaction correlation function The chemical reaction situation EH is calculated, where n is the number of different reaction combinations.

[0137] In actual use, there are many kinds of molten salt energy storage components, and not all molten salt components will produce chemical reactions. First, screen the molten salt energy storage components that will react to form a combination. Then, according to the reaction intensity and reaction range of different reaction combinations, the reaction conditions of the reaction combinations are calculated, and finally the reaction conditions of all reaction combinations are superimposed to obtain the total chemical reaction conditions. The more intense the chemical reaction, on the one hand, it will affect the molten salt energy storage, and on the other hand, it will cause material consumption, and ultimately affect the heat storage of the molten salt energy storage. For example, nitrates react with alkali metals at high temperatures to generate nitrogen oxide gas and other products. Sodium nitrate can decompose at high temperatures to generate sodium oxide and oxygen, while releasing nitrogen oxide gas.

[0138] Reference Figure 7, based on the heat storage, the historical heating demand is obtained, and the weight percentage is adjusted according to the historical heating demand and recorded as the molten salt composition. Specifically, the steps are:

[0139] Step S441, based on the heat storage, obtain the historical heating demand, calculate the difference between the heat storage and the historical heating demand and record it as the first demand difference.

[0140] Step S442: based on the first demand difference, a demand difference threshold is set; if the first demand difference is not greater than 0, the first demand difference is compared with the demand difference threshold.

[0141] Step S443: If the first demand difference is greater than the demand difference threshold, the molten salt energy storage component is set at the primary ratio and recorded as the molten salt component.

[0142] Step S444: If the first demand difference is not greater than the demand difference threshold, Sort different types of molten salt energy storage components from high to low and record them as sorted data.

[0143] Step S445, based on the sorting data, an adjustment ratio is set, and the molten salt energy storage component with the highest component effect is increased according to the adjustment ratio, and the molten salt energy storage component with the lowest component effect is decreased according to the adjustment ratio to form an intermediate ratio.

[0144] Step S446, based on the intermediate ratio, calculate the heat storage capacity of the molten salt energy storage, calculate the second demand difference according to the historical heating demand, and compare whether the second demand difference is greater than the demand difference threshold.

[0145] Step S447: if the second demand difference is greater than the demand difference threshold, the molten salt composition is obtained by setting the intermediate ratio.

[0146] Step S448: If the second demand difference is not greater than the demand difference threshold, the adjustment ratio is adjusted again to form a new ratio.

[0147] In actual application, in order to obtain a more accurate ratio of molten salt components and realize more economical, more environmentally friendly and more effective molten salt energy storage, it is necessary to adjust the molten salt energy storage components multiple times. For example, the primary ratio is the optimal ratio selection based on effect, cost and environmental protection. If the heating capacity meets the requirements, the molten salt components are directly configured using the primary ratio. If the primary ratio does not meet the requirements, the ratio of the molten salt component with better heat storage effect will be increased, and the ratio of the molten salt component with the worst heat storage effect will be decreased. Setting the adjustment ratio can achieve multiple adjustments and reduce errors. If the adjusted molten salt component ratio still does not meet the heating demand, it will be adjusted again until the heating demand is met.

[0148] Reference Figure 8, obtain the actual heating demand, and calculate the steps to obtain the actual demand situation, specifically:

[0149] Step S51, obtaining the real-time heating demand NG and temperature changes.

[0150] Step S52: based on the temperature change, a negative correlation curve between the historical temperature and the historical heating demand is obtained, and a heating demand fluctuation value NB is predicted according to the negative correlation curve between the historical temperature and the historical heating demand.

[0151] Step S53, obtaining the historical heating change curve, and finding the historical heating maximum fluctuation value ND.

[0152] Step S54, according to the demand correlation function The actual demand situation NQ is calculated.

[0153] In actual use, when building a molten salt energy storage system, it is necessary to build it according to the usage of previous years. In actual use, due to the changeable weather, the demand for heating is also changeable. The molten salt energy storage system needs to be electrically heated before it can store energy. Therefore, it is necessary to calculate the heating demand according to the actual situation to reduce the storage of too much heat and cause waste of electricity. When the temperature rises, the heating amount will decrease, and when the temperature drops, the heating amount will increase. For example, the real-time heating demand is 1 million kWh, and the current temperature is predicted to decrease, and the heating demand is expected to increase by 200,000 kWh. In order not to affect the user experience, more heating needs to be prepared in case of sudden changes in temperature. In the historical heating records, the maximum fluctuation value of the heating demand is 100,000 kWh, so it is actually necessary to store 130 kWh of heating through electric heating.

[0154] Reference Fig. 9 The scheduling module is connected to the demand module signal, and is used to receive the demand situation and schedule the steps of storing thermal energy according to the demand situation, specifically:

[0155] Step S61, based on the actual demand situation NQ, obtain the actual heating amount, calculate the difference between the actual heating amount and the actual demand situation and record it as the actual heating difference.

[0156] Step S62, based on the actual heating difference, obtain the power supply situation during the heating time, and determine whether the power supply situation is in the power supply peak period.

[0157] Step S63, if the power supply situation is at a peak period, the heat energy of the actual heating difference is connected to the heat energy conversion device and then to the power grid for power generation.

[0158] Step S64, if the power supply situation is not at the power supply peak period, the heat energy of the actual heating difference is connected to the heat energy conversion device and connected to the energy storage battery to store the electricity and use it for the next electric heating.

[0159] In actual use, in order not to affect the user experience, a heating amount greater than the user's demand will be prepared. In actual heating, there will often be a waste of excess heat energy. In order to reduce the waste of heat energy, excess heat energy can be used for power generation. For example, during peak electricity consumption, excess heat energy can be used for power generation in the power grid and directly used for residential electricity consumption, which can reduce the burden on the power grid. During non-peak electricity consumption periods, when the burden on the power grid is not heavy, heat energy can be converted into electrical energy and stored in energy storage batteries for the next electric heating to save resources.

[0160] Reference Fig.10 If the power supply is not at the peak period, the heat energy of the actual heating difference is connected to the heat energy conversion device and connected to the energy storage battery to store the electricity and use it for the next electric heating. Specifically, the steps are as follows:

[0161] Step S641, obtaining the energy loss rate of the thermal energy conversion device, and calculating the actual energy storage electric energy according to the thermal energy of the actual heating difference and the energy loss rate of the thermal energy conversion device.

[0162] The energy loss rate of the thermal energy conversion device is obtained through factory information of the thermal energy conversion device.

[0163] Step S642, calculating the electric heating energy based on the molten salt composition and the total molten salt amount of the molten salt energy storage.

[0164] The actual heating capacity is predicted based on the temperature change, and the electric energy required to heat to the heating temperature requirement is calculated based on the actual heating capacity and the total molten salt amount, which is recorded as electric heating electric energy.

[0165] Step S643, judging whether the actual stored energy is not less than the electric heating energy, if the actual stored energy is not less than the electric heating energy, the energy storage battery is started in the electric heating stage for electric heating.

[0166] Step S644: if the actual energy storage power is less than the electric heating power, determine whether it is in the power supply valley period. If it is in the power supply valley period, start the energy storage battery and the power grid to perform electric heating together.

[0167] Step S645: if the power supply is not in a low period, the required operating temperature is obtained, and the actual operating temperature of the energy storage battery heating is calculated, and a temperature difference threshold is set to determine whether the difference between the actual operating temperature of the energy storage battery heating and the required operating temperature reaches the temperature difference threshold.

[0168] Step S646: If the difference between the actual heating operating temperature of the energy storage battery and the required operating temperature does not reach the temperature difference threshold, the energy storage battery is started for electrical heating.

[0169] Step S647: If the difference between the actual heating operating temperature of the energy storage battery and the required operating temperature reaches the temperature difference threshold, the energy storage battery and the backup battery are started to perform electrical heating together.

[0170] In actual use, the conversion of thermal energy into electrical energy has a certain energy loss, and the actual amount of electricity is calculated based on the thermal energy conversion device. When the electric energy of the energy storage battery is not enough to support the molten salt energy storage system to achieve electric heating, if the power grid is in a low period at this time, the power grid can perform electric heating without affecting residents' electricity consumption. If the power grid is not in a low period, there is a risk of affecting residents' electricity consumption when the power grid heats the molten salt energy storage system. At this time, heating can be achieved by lowering the temperature. For example, if the heating demand reaches 60 degrees Celsius and the power is insufficient, it can be heated to 55 degrees Celsius to achieve heating. If the power still cannot meet the requirements, the backup battery is enabled.

[0171] The implementation principle of this system is as follows: the effect module is used to obtain the geographical environment of molten salt energy storage, analyze the heat storage effect of different types of molten salt components according to humidity, temperature and light, and mark it as component effect. The cost module analyzes the cost consumption of different types of molten salt energy storage components according to the cost of molten salt energy storage components and the use consumption caused by the stability and thermal properties of molten salt energy storage components and records it as cost consumption. The environmental protection module is used to analyze the environmental protection conditions of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and record it as environmental protection conditions. The proportion module calculates the suitability of different types of molten salt energy storage components according to the component effect, cost consumption and environmental protection conditions, and determines the primary proportion according to the suitability of different molten salt energy storage components. Based on the molten salt components configured based on the primary proportion, the heat storage capacity of the molten salt components under the proportion is analyzed according to the pressure, pH value, water consumption and chemical reaction conditions. When the heat storage does not meet the heating demand requirements, the proportion needs to be adjusted multiple times until the required proportion is obtained, and the molten salt energy storage components are obtained according to the proportion configuration. The demand module is used to receive the composition of molten salt, obtain the actual heating demand, and calculate the actual demand based on the temperature change and the maximum fluctuation value of the historical heating demand. The scheduling module is used to receive the demand and allocate excess heat energy to convert it into electrical energy under different circumstances through the thermal energy conversion device and then connect it to the power grid or energy storage battery. In the case of electric heating, different electric heating methods are matched according to the actual heating amount and the power of the energy storage battery.

[0172] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A molten salt energy storage electric heating system, characterized in that: The following steps are involved: Effect module, obtains the geographical environment of molten salt energy storage, analyzes the heat storage effects of different types of molten salt components according to the geographical environment of molten salt energy storage and marks them as component effects , where m is the number of different types of molten salt components; Cost module, which analyzes the cost consumption of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and records it as cost consumption ; Environmental protection module, which analyzes the environmental protection status of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and records it as environmental protection status ; The proportion module is connected to the effect module, the cost module and the environmental protection module for receiving the component effect , the cost consumption And the environmental protection situation , calculating the suitability of different types of molten salt energy storage components, and determining the proportions of different types of molten salt energy storage components according to the suitability of different molten salt energy storage components and recording them as molten salt components; A demand module, which is connected to the proportional module signal, is used to receive the molten salt composition, obtain the actual heating demand, and calculate the actual demand situation; A scheduling module is connected to the demand module signal, and is used to receive the demand situation and schedule the stored thermal energy according to the demand situation.

2. A molten salt energy storage electric heating system according to claim 1, characterized in that: The effect module obtains the geographical environment of molten salt energy storage, analyzes the heat storage effects of different types of molten salt components according to the geographical environment of molten salt energy storage, and marks them as component effects , specifically: Obtaining the geographical environment of molten salt energy storage, wherein the geographical environment includes average temperature BW, average humidity BS and average light BG; Obtaining a suitable environment for different types of molten salt components, the suitable environment includes a suitable temperature , Suitable humidity , suitable light ; Obtaining the initial heat storage effect of different types of molten salt compositions ; According to the heat storage effect correlation function Calculate the compositional effects of different types of molten salt compositions , , , is the scaling factor and is greater than 0.

3. A molten salt energy storage electric heating system according to claim 2, characterized in that: The cost module analyzes the cost consumption of different types of molten salt energy storage components according to the geographical environment of molten salt energy storage and records it as cost consumption , specifically: Cost of obtaining different types of molten salt energy storage components ; Based on the average temperature BW, a negative correlation curve between the average temperature and the stability of different types of molten salt energy storage components is established, and the stability of different types of molten salt energy storage components is obtained according to the negative correlation curve between the average temperature and the stability of different types of molten salt energy storage components. ; Obtaining the thermophysical properties of different types of molten salt energy storage components ; Consumption-related functions based on cost Calculate the cost of different types of molten salt energy storage components , , are different scale factors and are greater than 0.

4. A molten salt energy storage electric heating system according to claim 3, characterized in that: The steps of calculating the suitability of different types of molten salt energy storage components, determining the proportions of different types of molten salt energy storage components according to the suitability of different molten salt energy storage components and recording them as molten salt components, are specifically: According to the fitness correlation function Calculate the suitability of different types of molten salt energy storage components , , , is the scale factor and is greater than 0; According to the suitability of different types of molten salt energy storage components Form weighted percentages and label them as primary proportions; Based on the primary ratio, the use environment of the molten salt energy storage is obtained, and the heat storage amount is obtained according to the use environment analysis of the molten salt energy storage; Based on the heat storage, historical heating demand is obtained, and the weight percentage is adjusted according to the historical heating demand and recorded as the molten salt composition.

5. A molten salt energy storage electric heating system according to claim 4, characterized in that: Based on the primary ratio, the use environment of the molten salt energy storage is obtained, and the steps of obtaining the heat storage amount according to the use environment of the molten salt energy storage are specifically as follows: Obtaining the use environment of molten salt energy storage, wherein the use environment includes pressure EY, pH value EP, water storage capacity EZ and chemical reaction conditions EH; Obtain standard operating environments for different types of molten salt energy storage components, including standard pressure , Standard pH value And water consumption ; Obtain the total amount of molten salt for molten salt energy storage, and calculate the initial heat storage capacity of the molten salt according to the primary ratio ; According to the heat storage correlation function The heat storage EC is calculated as follows: , , is the scaling factor and is greater than 0.

6. A molten salt energy storage electric heating system according to claim 5, characterized in that: The steps of the chemical reaction scenario EH are specifically: Based on the primary ratio, different types of molten salt energy storage components that will react are screened to form different reaction combinations; Based on the different reaction combinations, the reaction intensity of different reaction combinations is obtained. , where n is the number of different reaction combinations; Based on the total molten salt amount of the molten salt energy storage and the primary ratio, the reaction range of different reaction combinations is obtained according to the amount of different reaction combinations. ; According to the reaction correlation function The chemical reaction condition EH is calculated.

7. A molten salt energy storage electric heating system according to claim 6, characterized in that: Based on the heat storage, a historical heating demand is obtained, and a weight percentage is adjusted according to the historical heating demand and recorded as the molten salt composition, specifically, the following steps: Based on the heat storage, historical heating demand is obtained, and the difference between the heat storage and historical heating demand is calculated and recorded as a first demand difference; Based on the first demand difference, setting a demand difference threshold, and if the first demand difference is not greater than 0, comparing the first demand difference with the demand difference threshold; If the first demand difference is greater than the demand difference threshold, setting the molten salt energy storage composition at the primary ratio and recording it as the molten salt composition; If the first demand difference is not greater than the demand difference threshold, then according to the component effect Sort different types of molten salt energy storage components from high to low and record them as sorted data; Based on the sorting data, an adjustment ratio is set, and the molten salt energy storage component with the highest component effect is increased according to the adjustment ratio, and the molten salt energy storage component with the lowest component effect is decreased according to the adjustment ratio to form an intermediate ratio; Based on the intermediate ratio, the heat storage value of the molten salt energy storage is calculated, a second demand difference is calculated according to the historical heating demand, and a comparison is made as to whether the second demand difference is greater than a demand difference threshold value; If the second demand difference is greater than the demand difference threshold, the molten salt composition is obtained by setting the intermediate ratio; If the second demand difference is not greater than the demand difference threshold, the new ratio is formed after adjustment again according to the adjustment ratio.

8. A molten salt energy storage electric heating system according to claim 7, characterized in that: The steps of obtaining the actual heating demand and calculating the actual demand are specifically as follows: Obtain real-time heating demand NG and temperature changes; Based on the temperature change, a negative correlation curve between historical temperature and historical heating demand is obtained, and a heating demand fluctuation value NB is predicted according to the negative correlation curve between historical temperature and historical heating demand; Obtain the historical heating change curve and find the historical maximum heating fluctuation value ND; Associative functions according to requirements The actual demand situation NQ is calculated.

9. A molten salt energy storage electric heating system according to claim 8, characterized in that: The scheduling module is connected to the demand module signal, and is used to receive the demand situation and schedule the steps of storing thermal energy according to the demand situation, specifically: Based on the actual demand situation NQ, the actual heating amount is obtained, and the difference between the actual heating amount and the actual demand situation is calculated and recorded as the actual heating difference; Based on the actual heating difference, the power supply situation during the heating period is obtained to determine whether the power supply situation is in a peak period; If the power supply is at a peak period, the heat energy of the actual heating difference is connected to the heat energy conversion device and then to the power grid for power generation; If the power supply is not at a peak period, the heat energy of the actual heating difference is connected to the thermal energy conversion device and connected to the energy storage battery to store the electricity and use it for the next electric heating.

10. A molten salt energy storage electric heating system according to claim 9, characterized in that: If the power supply is not at a peak period, the heat energy of the actual heating difference is connected to the heat energy conversion device and connected to the energy storage battery to store the electricity for the next electric heating, specifically: The energy loss rate of the heat energy conversion device is obtained, and the actual energy storage electric energy is calculated based on the heat energy of the actual heating difference and the energy loss rate of the heat energy conversion device; Based on the molten salt composition and the total molten salt amount of the molten salt energy storage, electric heating energy is calculated; Determine whether the actual energy storage electric energy is not less than the electric heating electric energy. If the actual energy storage electric energy is not less than the electric heating electric energy, start the energy storage battery for electric heating in the electric heating stage; If the actual energy storage power is less than the electric heating power, it is determined whether it is in the power supply valley period. If it is in the power supply valley period, the energy storage battery and the power grid are started to perform electric heating together; If it is not in the power supply valley period, the required operating temperature is obtained, and the actual operating temperature of the energy storage battery heating is calculated, and the temperature difference threshold is set to determine whether the difference between the actual operating temperature of the energy storage battery heating and the required operating temperature reaches the temperature difference threshold; If the difference between the actual working temperature of the energy storage battery heating and the required working temperature does not reach the temperature difference threshold, the energy storage battery is started for electrical heating; If the difference between the actual operating temperature of the energy storage battery heating and the required operating temperature reaches the temperature difference threshold, the energy storage battery and the backup battery are started to be electrically heated together.

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