A method for online monitoring of molten salt energy storage system equipment

Abstract

The present invention discloses an online monitoring method for molten salt energy storage system equipment, and the present invention relates to the field of online monitoring technology. The online monitoring method for molten salt energy storage system equipment, through the collection of equipment operating parameter change data before historical faults of the molten salt energy storage system equipment, after trend analysis and threshold determination, constructs a fault type reference corresponding to different fault types to establish a fault library, and then deploys sensors on the molten salt energy storage system equipment according to the fault library to collect the operating parameters of the molten salt energy storage system equipment, and through the comparison and processing of the operating parameters with the fault library, realizes the effective prediction of possible faults of the molten salt energy storage system equipment, provides a clear direction for the maintenance of the molten salt energy storage system equipment, and effectively ensures the long-term safe and effective operation of the molten salt energy storage system equipment.

Description

Technical Field

[0001] The present invention relates to the field of online monitoring technology, and in particular to an online monitoring method for molten salt energy storage system equipment. Background Art

[0002] The core of molten salt energy storage technology is to use molten salt with a low melting point as a medium for heat energy transfer and storage. A complete molten salt energy storage system usually includes molten salt materials, molten salt storage tanks, molten salt pumps, electric heaters, heat exchangers, deaerators, control systems and supporting water pumps, pipes and valves and other components. The molten salt energy storage system usually adopts a double tank design of cold and hot molten salt, and controls the storage and release of energy by changing the flow direction of the molten salt. In short, when thermal energy needs to be stored, the cold molten salt will flow through the electric heater to be heated, and then converted into hot molten salt and stored in the hot molten salt storage tank; when the stored thermal energy needs to be released, the hot molten salt will flow out, transfer the heat energy to the working medium through the heat exchanger, and then cool back to the cold molten salt storage tank to complete a cycle.

[0003] In order to ensure the long-term stable operation of the molten salt energy storage system, it is often necessary to carry out regular maintenance of the molten salt energy storage system equipment. However, this type of maintenance cannot effectively avoid damage to the molten salt energy storage system equipment, and the maintenance of the existing molten salt energy storage system equipment is often carried out only after a failure occurs, which cannot achieve early warning of the failure, seriously affecting the effective use of the molten salt energy storage system equipment. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an online monitoring method for molten salt energy storage system equipment, which solves the problem that the existing molten salt energy storage system equipment cannot achieve early fault warning, affecting the effective use of the molten salt energy storage system equipment.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a method for online monitoring of molten salt energy storage system equipment, specifically comprising the following steps:

[0006] S1. Obtaining the equipment operating parameter change data at different times before different historical faults of the molten salt energy storage system equipment;

[0007] S2. Determine the change trend of equipment operation parameter change data and establish a fault database;

[0008] S3. Obtaining operating parameters of the molten salt energy storage system equipment;

[0009] S4. Fault prediction based on changes in operating parameters.

[0010] The present invention is further configured as follows: the method for acquiring the equipment operating parameter change data in S1 includes:

[0011] Collect historical operating parameter data of the molten salt energy storage system equipment at the same time from the operating log of the molten salt energy storage system equipment;

[0012] After obtaining the operating parameter data in different time periods, obtain the fault type;

[0013] The operating parameter data related to the fault type is determined by experts as the equipment operating parameter change data corresponding to the fault type.

[0014] The present invention is further configured as follows: the method of judging the change trend of the equipment operation parameter change data in S2 includes:

[0015] Draw a separate line trend chart for each operating parameter in the equipment operating parameter change data according to the time series, and after marking the change trends of adjacent operating parameters in the separate line trend chart according to the time series, obtain a single fault table group;

[0016] After obtaining several groups of single fault table groups corresponding to the same fault type, a set of broken line trend tables corresponding to the fault type is constructed.

[0017] The present invention is further configured as follows: the method of establishing the fault library in S2 includes:

[0018] Obtain the directional marks of all the same operating parameters in the line trend table set at the same time, perform consistency analysis, and obtain the change trend of the operating parameters at adjacent times;

[0019] Obtain the change amount of the same operating parameters in the single fault table group at different adjacent times as a reference change amount;

[0020] Obtain reference variation of all single fault table groups in the line trend table set, and generate a reference variation set;

[0021] Sort the reference variation set from high to low, and take the range between the highest value and the lowest value as the variation threshold of the operating parameter between adjacent moments;

[0022] A mapping relationship between fault types and operating parameters, change trends and change thresholds is established as a reference for the types of faults that may occur in the molten salt energy storage system equipment. Several groups of different fault type references are collected to complete the establishment of a fault library.

[0023] The present invention is further configured as follows: the consistency analysis method includes:

[0024] Obtain the directional marks of the same operating parameter at the same adjacent moments, set a percentage threshold as the judgment standard for the change area, and when the proportion of a certain directional mark in all directional marks exceeds the judgment standard, use the directional mark as the change trend of the operating parameter at the adjacent moments.

[0025] The present invention is further configured as follows: the directional mark includes an enlarged mark, a unchanged mark and a reduced mark.

[0026] The present invention is further configured as follows: the method of obtaining the operating parameters of the molten salt energy storage system equipment in S3 includes:

[0027] All operating parameters in the fault database are obtained, and after the operating parameters are divided into different types, operating parameter acquisition sensors are deployed in the molten salt energy storage system equipment to collect the operating parameters of the molten salt energy storage system equipment online.

[0028] The present invention is further configured as follows: the method of performing fault prediction according to the change of the operating parameters in S4 includes:

[0029] The operating parameters of the molten salt energy storage system equipment at different times are obtained online, and the change trends and changes of the operating parameters in adjacent times are calculated to obtain the operating calculation parameters. The operating calculation parameters are divided according to the fault type reference, and the change trends and changes are compared with the change trends and change amount thresholds in the fault type reference. When the change trends are the same and the change amount is within the change amount threshold, it is determined that the molten salt energy storage system equipment may have a fault of the corresponding fault type.

[0030] The present invention provides an online monitoring method for molten salt energy storage system equipment. It has the following beneficial effects:

[0031] The present invention collects the equipment operating parameter change data before historical faults of the molten salt energy storage system equipment, performs trend analysis and threshold determination, and then constructs a fault type reference corresponding to different fault types to establish a fault library. Then, sensors are deployed on the molten salt energy storage system equipment according to the fault library to collect the operating parameters of the molten salt energy storage system equipment. By comparing the operating parameters with the fault library, effective prediction of possible faults of the molten salt energy storage system equipment is achieved, a clear direction is provided for the maintenance of the molten salt energy storage system equipment, and the long-term safe and effective operation of the molten salt energy storage system equipment is effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the process of the present invention;

[0033] Figure 2 It is a schematic diagram of the process of obtaining the equipment operation parameter change data in the present invention;

[0034] Figure 3 It is a schematic diagram of a process for judging the change trend of equipment operation parameter change data in the present invention;

[0035] Figure 4 It is a schematic diagram of the process of establishing the fault library in the present invention. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] See also Figure 1-4 The embodiment of the present invention provides the following technical solution: an online monitoring method for molten salt energy storage system equipment, specifically comprising the following steps:

[0038] S1. Obtain the equipment operating parameter change data at different times before different historical faults of the molten salt energy storage system equipment. The specific methods include:

[0039] Collect historical operating parameter data of the molten salt energy storage system equipment at the same time from the operating log of the molten salt energy storage system equipment;

[0040] After obtaining the operating parameter data in different time periods, obtain the fault type;

[0041] The operating parameter data related to the fault type is determined by experts as the equipment operating parameter change data corresponding to the fault type.

[0042] S2. Determine the trend of equipment operation parameter change data:

[0043] Draw a separate line trend chart for each operating parameter in the equipment operating parameter change data according to the time series, and after marking the change trends of adjacent operating parameters in the separate line trend chart according to the time series, obtain a single fault table group, wherein the directional marks include an increase mark, a constant mark, and a decrease mark;

[0044] After obtaining several groups of single fault table groups corresponding to the same fault type, a set of broken line trend tables corresponding to the fault type is constructed.

[0045] Create a fault library:

[0046] Obtain the directional marks of all the same operating parameters in the line trend table set at the same time, perform consistency analysis, and obtain the change trend of the operating parameters at adjacent times, wherein the consistency analysis method includes: obtaining the directional marks of the same operating parameter at the same adjacent time, setting a percentage threshold as the judgment standard of the change area, and when the proportion of a certain directional mark in all directional marks exceeds the judgment standard, the directional mark is used as the change trend of the operating parameter at the adjacent time;

[0047] Obtain the change amount of the same operating parameters in the single fault table group at different adjacent times as a reference change amount;

[0048] Obtain reference variation of all single fault table groups in the line trend table set, and generate a reference variation set;

[0049] Sort the reference variation set from high to low, and take the range between the highest value and the lowest value as the variation threshold of the operating parameter between adjacent moments;

[0050] A mapping relationship between fault types and operating parameters, change trends and change thresholds is established as a reference for the types of faults that may occur in the molten salt energy storage system equipment. Several groups of different fault type references are collected to complete the establishment of a fault library.

[0051] S3. Obtain the operating parameters of the molten salt energy storage system equipment:

[0052] All operating parameters in the fault database are obtained, and after the operating parameters are divided into different types, operating parameter acquisition sensors are deployed in the molten salt energy storage system equipment to collect the operating parameters of the molten salt energy storage system equipment online.

[0053] S4. Fault prediction is performed based on the changes in operating parameters. The specific methods include:

[0054] The operating parameters of the molten salt energy storage system equipment at different times are obtained online, and the change trends and changes of the operating parameters in adjacent times are calculated to obtain the operating calculation parameters. The operating calculation parameters are divided according to the fault type reference, and the change trends and changes are compared with the change trends and change amount thresholds in the fault type reference. When the change trends are the same and the change amount is within the change amount threshold, it is determined that the molten salt energy storage system equipment may have a fault of the corresponding fault type.

[0055] As a detailed description, when making a comparison judgment, the change trend of the operating parameters in adjacent moments is compared one by one with the change trend in the corresponding fault reference to determine whether the comparison results are the same. If they are the same, go to the next step. Otherwise, if they are not the same, the judgment of this fault type reference is directly terminated.

[0056] Determine whether the change in the operating parameter in adjacent moments is within the change threshold in the fault type reference. If yes, determine that the molten salt energy storage system equipment may have a fault of the corresponding fault type. If no, directly terminate the judgment of this fault type reference.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for online monitoring of molten salt energy storage system equipment, characterized in that: The specific steps include: S1. Obtaining the equipment operating parameter change data at different times before different historical faults of the molten salt energy storage system equipment; S2. Determine the change trend of equipment operation parameter change data and establish a fault database; S3. Obtaining operating parameters of the molten salt energy storage system equipment; S4. Fault prediction based on changes in operating parameters.

2. The method for online monitoring of a molten salt energy storage system according to claim 1, characterized in that: The method for acquiring the equipment operating parameter change data in S1 includes: Collect historical operating parameter data of the molten salt energy storage system equipment at the same time from the operating log of the molten salt energy storage system equipment; After obtaining the operating parameter data in different time periods, obtain the fault type; The operating parameter data related to the fault type is determined by experts as the equipment operating parameter change data corresponding to the fault type.

3. The method for online monitoring of a molten salt energy storage system according to claim 2, characterized in that: The method of judging the change trend of the equipment operation parameter change data in S2 includes: Draw a separate line trend chart for each operating parameter in the equipment operating parameter change data according to the time series, and after marking the change trends of adjacent operating parameters in the separate line trend chart according to the time series, obtain a single fault table group; After obtaining several groups of single fault table groups corresponding to the same fault type, a set of broken line trend tables corresponding to the fault type is constructed.

4. The method for online monitoring of a molten salt energy storage system according to claim 3, characterized in that: The method of establishing the fault library in S2 includes: Obtain the directional marks of all the same operating parameters in the line trend table set at the same time, perform consistency analysis, and obtain the change trend of the operating parameters at adjacent times; Obtain the change amount of the same operating parameters in the single fault table group at different adjacent times as a reference change amount; Obtain reference variation of all single fault table groups in the line trend table set, and generate a reference variation set; Sort the reference variation set from high to low, and take the range between the highest value and the lowest value as the variation threshold of the operating parameter between adjacent moments; A mapping relationship between fault types and operating parameters, change trends and change thresholds is established as a reference for the types of faults that may occur in the molten salt energy storage system equipment. Several groups of different fault type references are collected to complete the establishment of a fault library.

5. The method for online monitoring of a molten salt energy storage system according to claim 4, characterized in that: The consistency analysis method includes: Obtain the directional marks of the same operating parameter at the same adjacent moments, set a percentage threshold as the judgment standard for the change area, and when the proportion of a certain directional mark in all directional marks exceeds the judgment standard, use the directional mark as the change trend of the operating parameter at the adjacent moments.

6. The method for online monitoring of a molten salt energy storage system according to claim 5, characterized in that: The directional marks include an enlargement mark, a constant mark and a reduction mark.

7. The method for online monitoring of a molten salt energy storage system according to claim 4, characterized in that: The method of obtaining the operating parameters of the molten salt energy storage system equipment in S3 includes: All operating parameters in the fault database are obtained, and after the operating parameters are divided into different types, operating parameter acquisition sensors are deployed in the molten salt energy storage system equipment to collect the operating parameters of the molten salt energy storage system equipment online.

8. The method for online monitoring of a molten salt energy storage system according to claim 7, characterized in that: The method of performing fault prediction according to the change of operating parameters in S4 includes: The operating parameters of the molten salt energy storage system equipment at different times are obtained online, and the change trends and changes of the operating parameters in adjacent times are calculated to obtain the operating calculation parameters. The operating calculation parameters are divided according to the fault type reference, and the change trends and changes are compared with the change trends and change amount thresholds in the fault type reference. When the change trends are the same and the change amount is within the change amount threshold, it is determined that the molten salt energy storage system equipment may have a fault of the corresponding fault type.

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