Steam extraction pipeline blowpipe system, method and device for molten salt energy storage system

Abstract

The application provides a molten salt energy storage system steam extraction pipeline blowing system, method and device, relates to the field of generator set maintenance, and comprises a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a temporary blowing door and a target plate; wherein, the first temporary pipeline is arranged between the inlet and the outlet of the main steam superheating heat exchanger in the molten salt energy storage system, so as to short-circuit the main steam superheating heat exchanger; the second temporary pipeline is arranged between the inlet and the outlet of the heat re-superheating heat exchanger in the molten salt energy storage system, so as to short-circuit the heat re-superheating heat exchanger; the cold re-steam branch pipeline in the molten salt energy storage system is connected to the heat re-steam branch pipeline in the molten salt energy storage system through the third temporary pipeline; the temporary blowing door and the target plate are sequentially arranged on the third temporary pipeline. The application can solve the problems of low efficiency, long time consumption, energy waste and multiple shutdown and cooling in the traditional molten salt energy storage system steam extraction pipeline blowing process.

Description

Technical Field

[0001] This application relates to the field of generator set maintenance, specifically to a steam extraction pipeline blowing system, method, and apparatus for a molten salt energy storage system. Background Technology

[0002] For supercritical coal-fired steam turbine generator units, the extracted steam from a single unit can meet all the heat storage and heating needs of the molten salt energy storage system. This achieves thermoelectric decoupling, enhances the unit's peak-shaving capacity, and ensures normal heating supply during peak periods. The molten salt energy storage system consists of three subsystems: a cold / hot salt storage system, a molten salt thermal storage system, and a steam generation system. It uses ternary Hitec molten salt and is equipped with a nitrogen-sealing system. In the molten salt thermal storage system, main steam, hot reheat steam, and four-stage extracted steam heat the molten salt for heat storage. Condensate is pumped into the steam generation system via a molten salt feedwater pump, where it exchanges heat with the high-temperature molten salt to generate the industrial steam required by the user.

[0003] Steam pipeline blowing in molten salt thermal storage systems is a crucial procedure before commissioning. Its purpose is to remove various impurities (such as sand, stones, slag, welding slag, and rust) left in the steam pipelines during manufacturing, transportation, storage, and installation. This prevents reheater tube rupture and damage to the turbine's flow path during operation, improving the unit's safety and economy, and enhancing steam quality during operation. However, traditional molten salt thermal storage systems suffer from low efficiency, long processing times, energy waste, and multiple shutdowns for cooling during the steam extraction pipeline blowing process.

[0004] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section. Summary of the Invention

[0005] To address the problems in the existing technology, this application provides a method and apparatus for blowing steam into the extraction pipeline of a molten salt energy storage system, which can solve the problems of low efficiency, long time consumption, energy waste, and multiple shutdowns for cooling that exist in the traditional steam extraction pipeline blowing process of molten salt energy storage systems.

[0006] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0007] In a first aspect, this application provides a steam extraction pipeline blowing system for a molten salt energy storage system, including a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a temporary blowing valve, and a target plate;

[0008] Specifically, a first temporary pipe is installed between the inlet and outlet of the main steam superheater in the molten salt energy storage system to short-circuit the main steam superheater; a second temporary pipe is installed between the inlet and outlet of the hot reheater in the molten salt energy storage system to short-circuit the hot reheater; the connection between the cold reheat branch pipe and the cold reheat pipe in the molten salt energy storage system is disconnected, and connected to the hot reheat branch pipe in the molten salt energy storage system through a third temporary pipe; the temporary blow-off valve and the target plate are sequentially installed on the third temporary pipe.

[0009] Furthermore, the steam extraction pipeline blowing system of the large molten salt energy storage system also includes a fourth temporary pipeline and a silencer;

[0010] The fourth temporary pipe and silencer are installed at the outlet of the hot reheat heat exchanger.

[0011] Secondly, this application provides a method for blowing steam through the extraction pipeline of a molten salt energy storage system, applied to the aforementioned large-scale molten salt energy storage system's steam extraction pipeline blowing system, comprising:

[0012] The electric valves of the main steam branch pipes connected to the adjacent unit boilers, the electric valves of the cold resteam branch pipes connected to the adjacent unit boilers, the electric valves of the hot resteam branch pipes connected to the adjacent unit boilers, the electric valves of the pipes from the main steam superheat heat exchanger to the main steam condensing subcool heat exchanger, and the temporary blow-out valves in the molten salt energy storage system are kept in the closed state.

[0013] The electric gates along the purging pipeline in the molten salt energy storage system are controlled to be in the open state; wherein, the purging pipeline includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a fourth temporary pipeline, and a steam extraction pipeline in the molten salt energy storage system that participates in the purging.

[0014] Using the main steam from the original unit boiler as the steam source, the first stage of purging is carried out on the purging pipeline; wherein, the pressure of the main steam is controlled according to a predetermined purging coefficient;

[0015] After the furnace is shut down and cooled, the main steam is used as the steam source to perform the second stage of blowing on the purging pipeline;

[0016] After the furnace is shut down for cooling and the exhaust steam at the silencer is checked to be clean and free of debris, the main steam is used as the steam source to perform the third stage of blowing on the purging pipeline; wherein, the blowing is terminated when the marks on the target plate are detected to meet the preset blowing termination conditions.

[0017] Furthermore, the first stage of purging the purging pipeline using the main steam from the original unit boiler as the steam source includes:

[0018] The original unit boiler is controlled to sequentially perform water filling, cold flushing, boiler ignition, hot flushing, and pressurization;

[0019] The pre-purge valve is gradually opened to warm up the purging pipeline using the main steam as the steam source.

[0020] After the pipe has been warmed up sufficiently, the test blowing process in the first stage of pipe blowing is carried out;

[0021] During the test blowing process, the blowing coefficient is determined based on the steam flow rate under rated operating conditions, the steam specific volume under rated operating conditions, the real-time collected steam flow rate under blowing conditions, and the steam specific volume under blowing conditions.

[0022] Adjust the test blowpipe pressure according to the blowpipe coefficient, and determine the formal blowpipe pressure according to the test blowpipe pressure;

[0023] The formal blowing process in the first stage of blowing is carried out according to the formal blowing pressure; wherein, when the number of formal blowings in the first stage of blowing reaches the first preset number of blowings, the first stage of blowing ends and the furnace is shut down for cooling.

[0024] Furthermore, the second-stage purging of the purging pipeline using the main steam as the steam source includes:

[0025] Using the main steam as the steam source, the second stage of blowing is carried out according to the formal blowing pressure;

[0026] When the number of blow-throughs in the second stage reaches the second preset number of blow-throughs, check whether the exhaust from the silencer is clean and free of impurities;

[0027] If so, conduct a test firing, end the second stage of blowdown, and shut down the furnace for cooling.

[0028] Furthermore, the third-stage purging of the purging pipeline using the main steam as the steam source includes:

[0029] Using the main steam as the steam source, the third stage of blowing is carried out according to the formal blowing pressure;

[0030] When the exhaust from the muffler is detected to be clean and free of impurities, the actual target firing will commence.

[0031] Detect whether the marks on the target plate meet the preset blowpipe termination conditions; if so, end the third stage of blowpipe blowing; wherein, the blowpipe termination conditions include the mark size and the number of marks.

[0032] Thirdly, this application provides a steam extraction pipeline blowing device for a molten salt energy storage system, comprising:

[0033] The valve closing unit is used to control the electric valves of the main steam branch pipes connected to the adjacent unit boilers, the electric valves of the cold re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the hot re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the pipes from the main steam superheat heat exchanger to the main steam condensing subcool heat exchanger, and the temporary blow-off valve in the molten salt energy storage system to be in the closed state.

[0034] A valve opening unit is used to control the electric doors along the purging pipeline in the molten salt energy storage system to be in the open state; wherein, the purging pipeline includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a fourth temporary pipeline, and a steam extraction pipeline in the molten salt energy storage system that participates in purging;

[0035] The first blowdown unit is used to perform the first stage of blowdown on the purging pipeline using the main steam from the original unit boiler as the steam source; wherein, the pressure of the main steam is controlled according to a predetermined blowdown coefficient;

[0036] The second blowdown unit is used to perform a second stage of blowdown on the purging pipeline after the furnace is shut down and cooled, using the main steam as the steam source.

[0037] The third blowdown unit is used to perform the third stage of blowdown on the purging pipeline after the furnace is shut down for cooling and the exhaust steam at the silencer is clean and free of impurities. The blowdown ends when the marks on the target plate meet the preset blowdown termination conditions.

[0038] Further, the first blowpipe unit includes:

[0039] The boiler operation module is used to control the original unit boiler to sequentially perform water filling, cold flushing, boiler ignition, hot flushing and pressurization;

[0040] The warm-up operation module is used to control the gradual opening of the purge valve, using the main steam as the steam source, to warm up the purging pipeline;

[0041] The test blowing operation module is used to perform the test blowing process in the first stage of blowing after the pipe has been fully warmed up;

[0042] The coefficient determination module is used to determine the blowing coefficient based on the steam flow rate under rated operating conditions, the steam specific volume under rated operating conditions, and the real-time collected steam flow rate and steam specific volume under blowing conditions during the test blowing process.

[0043] The pressure determination module is used to adjust the test blowpipe pressure according to the blowpipe coefficient, and to determine the formal blowpipe pressure according to the test blowpipe pressure.

[0044] The formal blowing module is used to perform the formal blowing process in the first stage of blowing according to the formal blowing pressure; wherein, when the number of formal blowings in the first stage of blowing reaches the first preset number of blowings, the first stage of blowing ends and the furnace is shut down for cooling.

[0045] Furthermore, the second blowpipe unit includes:

[0046] The second blowdown module is used to perform a second stage of blowdown based on the main steam as the steam source and the formal blowdown pressure.

[0047] The second silencer detection module is used to detect whether the exhaust gas from the silencer is clean and free of impurities when the number of blow-throughs in the second stage reaches the second preset number of blow-throughs.

[0048] The second shutdown cooling module is used to perform test firing and end the second stage of blowing pipes, and then shut down the furnace for cooling.

[0049] Furthermore, the third blowpipe unit includes:

[0050] The third blowdown module is used to perform the third stage of blowdown based on the main steam as the steam source and the formal blowdown pressure.

[0051] The third silencer detection module is used to conduct formal target firing when the exhaust steam from the silencer is detected to be clean and free of impurities.

[0052] The third shutdown cooling module is used to detect whether the marks on the target plate meet the preset blow-off end conditions; if so, the third stage of blow-off is terminated; wherein, the blow-off end conditions include the mark size and the number of marks.

[0053] Fourthly, this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the steam extraction pipeline blowing method of the large molten salt energy storage system.

[0054] Fifthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the steam extraction pipeline blowing method for the large molten salt energy storage system.

[0055] Sixthly, this application provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the steam extraction pipeline blowing method for the large molten salt energy storage system.

[0056] To address the problems in the existing technology, the method and apparatus for blowing steam into the extraction pipeline of a large molten salt energy storage system provided in this application can connect the main steam extraction pipeline and the hot re-extraction pipeline of the molten salt energy storage system in series for energy storage, thereby achieving pressure reduction blowing. This solves the problems of traditional molten salt energy storage systems requiring segmented purging for steam extraction pipeline blowing, which results in low efficiency, long time consumption, large energy waste, and the need for multiple shutdowns for cooling. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a structural diagram of the steam extraction pipeline blowing system of the molten salt energy storage system in the embodiments of this application;

[0059] Figure 2 This is a flowchart of the steam extraction pipeline blowing method for a large molten salt energy storage system as described in this application.

[0060] Figure 3 This is a flowchart illustrating the first stage of blowpipe blowing in this embodiment of the application;

[0061] Figure 4 This is a flowchart illustrating the second-stage blowpipe procedure in an embodiment of this application;

[0062] Figure 5 This is a flowchart illustrating the third-stage blowpipe procedure in an embodiment of this application;

[0063] Figure 6 This is a structural diagram of the steam extraction pipeline blowing device of the large molten salt energy storage system in the embodiments of this application;

[0064] Figure 7 This is a structural diagram of the first blowpipe unit in the embodiments of this application;

[0065] Figure 8 This is a structural diagram of the second blowpipe unit in the embodiments of this application;

[0066] Figure 9 This is a structural diagram of the third blowpipe unit in the embodiments of this application;

[0067] Figure 10 This is a schematic diagram of the structure of the electronic device in the embodiments of this application. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0069] The information collected in the technical solution of this application is information and data authorized by the user or fully authorized by all parties. The collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data all comply with the relevant laws, regulations and standards of the relevant countries and regions, necessary confidentiality measures have been taken, and they do not violate public order and good morals. Corresponding operation portals are provided for users to choose to authorize or refuse.

[0070] Provide users with corresponding operation entry points, allowing them to choose to agree to or reject the automated decision results; if the user chooses to reject, the process will proceed to the expert decision-making process.

[0071] In one embodiment, see Figure 1 In order to solve the problems of low efficiency, long time consumption, energy waste and multiple shutdowns for cooling in the traditional steam extraction pipeline blowing process of molten salt energy storage system, this application provides a steam extraction pipeline blowing system for molten salt energy storage system, including a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a fourth temporary pipeline, a temporary blowing valve, a target plate and a silencer.

[0072] Specifically, a first temporary pipe is installed between the inlet and outlet of the main steam superheater in the molten salt energy storage system to short-circuit the main steam superheater; a second temporary pipe is installed between the inlet and outlet of the hot reheater in the molten salt energy storage system to short-circuit the hot reheater; the connection between the cold reheat branch pipe and the cold reheat pipe in the molten salt energy storage system is disconnected and connected to the hot reheat branch pipe in the molten salt energy storage system through a third temporary pipe; the temporary blow-off valve and the target plate are sequentially installed on the third temporary pipe; and a fourth temporary pipe and a silencer are installed at the outlet of the hot reheater.

[0073] Understandably, see Figure 1 This application's embodiments make the following key improvements to the original molten salt energy storage system: First, the main steam superheater's front and rear pipelines are short-circuited using temporary pipes. The main steam superheater does not participate in purging and must be cleaned before the equipment leaves the factory. Second, the hot reheater's front and rear pipelines are short-circuited using temporary pipes. The hot reheater does not participate in purging and must be cleaned before the equipment leaves the factory. Third, a temporary pressure measuring point and a temporary temperature measuring point are arranged at the outlet of the cold reheat steam branch pipe of the original unit boiler's molten salt thermal storage system. Fourth, temporary sealing devices are installed on pipelines that do not participate in purging during the blowdown process.

[0074] The working process of blowpipe blowing is as follows:

[0075] The purging steam source is the main steam from the original unit boiler. The main steam extraction branch pipe and main pipe, the cold reheat steam branch pipe and main pipe, and the hot reheat steam extraction branch pipe and main pipe of the molten salt thermal storage system connected to the original unit boiler are purged in series. The cold reheat steam branch pipe of the molten salt thermal storage system is disconnected at the connection point with the cold reheat steam pipe of the original unit boiler and connected to the hot reheat steam extraction branch pipe of the molten salt thermal storage system via a temporary pipe. Temporary purging valves and target plates are sequentially arranged on this temporary pipe section. The outlet pipe of the hot reheat superheater is disconnected after the mixing device and then connected to a temporary pipe and silencer. See the temporary purging system structure for details. Figure 1 As shown.

[0076] As can be seen from the above description, the steam extraction pipeline blowing system for the large-scale molten salt energy storage system provided in this application can connect the main steam extraction pipeline and the hot re-extraction pipeline of the molten salt energy storage system in series for energy storage, realize pressure reduction blowing, and solve the problems of traditional molten salt energy storage systems that require segmented purging for steam extraction pipeline blowing, resulting in low efficiency, long time consumption, large energy waste, and the need for multiple furnace shutdowns for cooling.

[0077] In one embodiment, see Figure 2 To address the problems of low efficiency, long processing time, energy waste, and multiple shutdowns for cooling in traditional molten salt energy storage system extraction steam pipeline blowing processes, this application provides a method for blowing steam into the extraction steam pipeline of a molten salt energy storage system, applicable to the aforementioned large-scale molten salt energy storage system extraction steam pipeline blowing system, comprising:

[0078] S101: Control the electric valves of the main steam branch pipes connected to the adjacent unit boilers, the electric valves of the cold re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the hot re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the pipes from the main steam superheat heat exchanger to the main steam condensing subcool heat exchanger, and the temporary blow-out valve in the molten salt energy storage system to be in the closed state.

[0079] S102: Control the electric gates along the purging pipeline in the molten salt energy storage system to be in the open state; wherein, the purging pipeline includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a fourth temporary pipeline, and a steam extraction pipeline in the molten salt energy storage system that participates in the purging.

[0080] S103: Using the main steam from the original unit boiler as the steam source, the first stage of purging is performed on the purging pipeline; wherein, the pressure of the main steam is controlled according to a predetermined purging coefficient;

[0081] S104: After the furnace is shut down and cooled, the main steam is used as the steam source to perform the second stage of blowing on the purging pipeline;

[0082] S105: After the furnace is shut down for cooling and the exhaust steam at the silencer is found to be clean and free of debris, the main steam is used as the steam source to perform the third stage of blowing on the purging pipeline; wherein, when the marks on the target plate are detected to meet the preset blowing end conditions, the blowing is terminated.

[0083] It is understood that the purpose of this invention is at least to provide a scheme for connecting the main steam extraction pipeline and the hot re-extraction pipeline of a molten salt energy storage system in series for energy storage and pressure reduction blow-off. Traditional molten salt energy storage systems use segmented purging for the extraction pipeline, which results in low efficiency, long processing time, energy waste, and multiple shutdowns for cooling.

[0084] Before purging, open all manual and electric valves along the purging route. "Along the route" includes at least all newly constructed temporary pipelines. Figure 1 (shown by a dotted line in the middle) and part of the pipelines in the original molten salt energy storage system ( Figure 1 (Indicated by the solid orange line).

[0085] Close the electric valves on the main steam branch pipes of the molten salt thermal storage system connected to the adjacent boiler units, the electric valves on the cold reheat steam branch pipes of the molten salt thermal storage system connected to the adjacent boiler units, and the electric valves on the hot reheat steam branch pipes of the molten salt thermal storage system connected to the adjacent boiler units. Close the electric valves on the pipes from the main steam superheater heat exchanger to the main steam condenser subcooler heat exchanger of the molten salt thermal storage system, and keep the emergency blowdown valve closed.

[0086] Next, the operators followed the unit's operating procedures to sequentially complete the boiler water filling, cold flushing, boiler ignition, hot flushing, and pressurization processes of the original unit. After the main steam pressure of the original unit's boiler began to rise, the main steam pressure was controlled through the original unit's high-pressure bypass valve. The temporary blowdown valve was slowly opened to warm up the temporary system pipes. When the main steam pressure reached P5, P6, P7, P8, and P9, the expansion and support checks of the boiler and the temporary system (referring to the steam extraction pipeline blowing system of the large molten salt energy storage system provided in this application) were performed. Among them, P5 < P6 < P7 < P8 < P9 represents the pressurization process of the main steam pressure, and the specific parameters are not limited and can be set according to the actual operating conditions.

[0087] The key parameter control process of this method is as follows: Before opening the temporary blow-out valve, the water level in the storage tank should be controlled at a low level to prevent steam from carrying water during the blow-out process; during the opening of the temporary blow-out valve, the automatic overflow regulating valve can be deactivated, and the water level in the storage tank can be manually adjusted; during the opening of the temporary blow-out valve, if the water level in the storage tank rises continuously (false water level), the overflow regulating valve can be closed to maintain the current feedwater pump output; during the closing of the temporary blow-out valve, if the water level in the storage tank drops sharply (false water level), the feedwater pump output should be quickly increased (or the feedwater bypass opening should be increased); when the water level in the storage tank begins to rise from its lowest point, the feedwater flow rate should be quickly reduced, and the overflow regulating valve should be adjusted to quickly restore the water level in the storage tank to the normal range, ensuring that the water level in the storage tank is visible. Here, the false water level refers to the unreal water level in the boiler storage tank during the blow-out process.

[0088] The system pressure drop during blowdown is compared to the system pressure drop ratio β under rated operating conditions, which is used as the criterion for closing the temporary blowdown control valve: the temporary blowdown control valve is closed when the pressure drop ratio β approaches 1.4. During blowdown, the main steam temperature is controlled to not exceed T1, and the steam parameters at all points in the boiler and molten salt thermal storage system must not exceed the allowable temperature and pressure values ​​of the materials. By strictly controlling the separator pressure drop, the number of blowdowns can be controlled to 4 times per hour.

[0089] Specifically, the pressure drop ratio β = ΔP1 / ΔP0. Where ΔP1 is the flow resistance of a certain section under blowdown conditions, in Pa; ΔP0 is the flow resistance of a certain section under rated conditions, in Pa; and β is the pressure drop ratio. Extensive engineering experience shows that when the pressure drop ratio β is 1.4, the corresponding blowdown coefficient K can be guaranteed to be greater than 1.

[0090] Specifically, the blowdown coefficient K = (G1 × v1) / (G0 × v0). Where G1 is the steam flow rate under blowdown conditions, t / h; and v1 is the specific volume of steam under blowdown conditions, m³ / h. 3 / kg; G0 is the steam flow rate under rated operating conditions, t / h; v0 is the steam specific volume under rated operating conditions, m³ / h. 3 / kg.

[0091] As can be seen from the above description, the steam extraction pipeline blowing system for the large-scale molten salt energy storage system provided in this application can connect the main steam extraction pipeline and the hot re-extraction pipeline of the molten salt energy storage system in series for energy storage, realize pressure reduction blowing, and solve the problems of traditional molten salt energy storage systems that require segmented purging for steam extraction pipeline blowing, resulting in low efficiency, long time consumption, large energy waste, and the need for multiple furnace shutdowns for cooling.

[0092] In one embodiment, see Figure 3 The first stage of purging the purging pipeline, using the main steam from the original unit boiler as the steam source, includes:

[0093] S201: Control the original unit boiler to sequentially perform water filling, cold flushing, boiler ignition, hot flushing and pressurization;

[0094] S202: Control the purge valve to open gradually, using the main steam as the steam source to warm up the purging pipeline;

[0095] S203: After the pipe has been warmed up sufficiently, proceed with the test blowing process in the first stage of pipe blowing;

[0096] S204: During the test blowing process, the blowing coefficient is determined based on the steam flow rate under rated operating conditions, the steam specific volume under rated operating conditions, the real-time collected steam flow rate under blowing conditions, and the steam specific volume under blowing conditions.

[0097] S205: Adjust the test blowpipe pressure according to the blowpipe coefficient, and determine the formal blowpipe pressure according to the test blowpipe pressure;

[0098] S206: Perform the formal blowing process in the first stage of blowing according to the formal blowing pressure; wherein, when the number of formal blowings in the first stage of blowing reaches the first preset number of blowings, the first stage of blowing ends and the furnace is shut down for cooling.

[0099] Understandably, the first stage of the blowpipe process is as follows:

[0100] (1) Before purging, open all manual and electric valves along the pipeline to be purged. Close the electric valves on the main steam branch pipeline of the molten salt thermal storage system connected to the adjacent unit boiler, the electric valves on the cold reheat steam branch pipeline of the molten salt thermal storage system connected to the adjacent unit boiler, and the electric valves on the hot reheat steam branch pipeline of the molten salt thermal storage system connected to the adjacent unit boiler. Close the electric valves on the pipeline from the main steam superheat heat exchanger to the main steam condenser subcooling heat exchanger of the molten salt thermal storage system. Keep the pre-purge valves closed.

[0101] (2) The operators shall complete the boiler water filling, cold flushing, boiler ignition, hot flushing and pressurization processes of the original unit in sequence according to the unit operation procedures. After the main steam pressure of the original unit boiler begins to rise, the main steam pressure shall be controlled by the high-pressure bypass valve of the original unit. The temporary blowdown bypass valve shall be opened slowly to warm up the temporary system. When the main steam pressure is P5, P6, P7, P8 and P9, the expansion and support of the boiler and temporary system shall be checked.

[0102] (3) After the pipe has been fully warmed up, begin the test blow-through. The test blow-through pressure can be set from P. 11 start.

[0103] (4) After the test blow-up, the temporary system and its support and fixation should be checked. If the formal system (referring to the original molten salt energy storage system) or the temporary system is found to be defective, the blow-up should be stopped immediately. If there is no abnormality, the temporary blow-up valve should be closed completely and the pressure should be increased.

[0104] (5) During the test blowdown process, observe the main steam pressure of the original unit boiler and the pressure at the temporary outlet of the cold reheat steam branch pipe of the molten salt thermal storage system when the temporary blowdown valve is fully open, and calculate the blowdown coefficient K. Then, determine the pressure for the next test blowdown based on the blowdown coefficient K. When the blowdown coefficient K > 1, the main steam pressure P... 21 This can stop the system pressurization and, according to the pressure P, 21 Proceed with the formal blowpipe blowing.

[0105] (6) During the formal blowing process, the first formal blowing requires the pre-installation of a target plate to check the initial level of dirt in the blowing system and the performance of the target plate. Strictly control the pressure drop of the separator and control the number of blowing cycles to 4 per hour. Control the blowing rate and the steam temperature of the main steam and reheater by reasonably adjusting the coal feed rate and water flow rate. During the blowing process, pay attention to checking the system expansion and the stress on the supports and hangers.

[0106] (7) During the blowdown process, each monitoring panel has a clear division of labor and timely adjustments are made to the boiler combustion.

[0107] (8) Once the muffler is found to be clean and free of debris, a test shot can be fired. When replacing the target plate, the temporary control valve of the blowpipe should be closed, the power supply should be cut off, and reliable safety measures should be in place.

[0108] (9) Make a record of each blowing operation. After the first blowing operation is completed (X1 times), the first stage of blowing will end and the furnace will be shut down for cooling.

[0109] As can be seen from the above description, the steam extraction pipeline blowing method for a large molten salt energy storage system provided in this application can use the main steam of the original unit boiler as the steam source to perform the first stage of blowing on the purging pipeline.

[0110] In one embodiment, see Figure 4 The second stage of purging the purging pipeline using the main steam as the steam source includes:

[0111] S301: Using the main steam as the steam source, perform the second stage of blowing according to the formal blowing pressure;

[0112] S302: When the number of blow-throughs in the second stage reaches the second preset number of blow-throughs, check whether the exhaust of the silencer is clean and free of impurities;

[0113] S303: If so, conduct a test firing and end the second stage of blowdown, then shut down the furnace for cooling.

[0114] Understandably, the second stage of blowdown process is as follows: repeat steps (1)-(6) of the first stage for the second stage of blowdown. After the formal blowdown X2 times, and after it is detected that the exhaust steam at the silencer is clean and free of debris, a test target can be performed. When replacing the target plate, the temporary control valve for blowdown should be closed, the power supply should be cut off, and reliable safety measures should be in place. After the formal blowdown X3 times, the second stage of blowdown ends, and the furnace is shut down for cooling.

[0115] As can be seen from the above description, the steam extraction pipeline blowing method for a large molten salt energy storage system provided in this application can use the main steam as a steam source to perform a second-stage blowing of the purging pipeline.

[0116] In one embodiment, see Figure 5 The third stage of purging the purging pipeline using the main steam as the steam source includes:

[0117] S401: Using the main steam as the steam source, perform the third stage of blowing according to the formal blowing pressure;

[0118] S402: When the exhaust from the silencer is detected to be clean and free of impurities, proceed with the formal target firing.

[0119] S403: Detect whether the marks on the target plate meet the preset blowpipe termination conditions; if so, end the third stage of blowpipe; wherein, the blowpipe termination conditions include the mark size and the number of marks.

[0120] Understandably, the third stage of blowpipe process is as follows: Repeat steps (1)-(6) of the first stage to perform the third stage of blowpipe. After the formal blowpipe has been performed four times, and after it is detected that the exhaust at the silencer is clean and free of debris, continuous target shooting can be performed. When changing the target plate, the temporary control valve for blowpipe should be closed, the power supply should be cut off, and reliable safety measures should be in place. After the formal blowpipe has been performed five times, the target plate should be changed twice consecutively for acceptance testing: it should meet the standard of "no blemishes larger than 0.8mm and no more than 8 blemishes in the range of 0.2mm to 0.8mm" to be considered qualified. After the blowpipe is qualified, the third stage of blowpipe is completed.

[0121] As can be seen from the above description, the steam extraction pipeline blowing method for a large molten salt energy storage system provided in this application can use the main steam as a steam source to perform a third-stage blowing of the purging pipeline.

[0122] In practice, risk prevention and control should also be carried out:

[0123] (1) Upon entering the site, workers must wear safety helmets; insulated shoes should be worn when performing live operations.

[0124] (2) On-site testing work must comply with the work permit system, work authorization system, work supervision system, and work interruption, transfer and termination system;

[0125] (3) During the blowing stage, the temperature and pressure at all parts of the system should be strictly controlled within the permissible range;

[0126] (4) Work clothes must be worn when entering the site. All work clothes must be buttoned up, sleeves must not be too long, and long hair must be tucked into a hat. Avoid direct contact with rotating equipment. A warning line should be set up and an isolation zone established for equipment trial operation. Personnel unrelated to the equipment trial operation are prohibited from approaching.

[0127] (5) When working at height, ladders and temporary climbing ladders should be firm and reliable, with anti-slip and anti-fall measures. When there is a risk of falling, safety belts should be worn. Safety belts should be fastened to firm and reliable fixed supports and should not be hung on movable supports.

[0128] (6) All equipment working lights and emergency lights in the factory are in good working order to ensure sufficient lighting. On-site lighting should be arranged reasonably, and directional lighting covers should be installed for nighttime lighting.

[0129] (7) During each blow-through, the pressure drop in the separator should be strictly controlled, and the saturation temperature drop should not exceed 42°C; (8) Before opening the blow-through valve, the water level in the storage tank should be kept low to prevent water carryover during blow-through; during the test blow-through...

[0130] During the process, operators should gradually familiarize themselves with the boiler's steam-water regulation characteristics and explore the boiler's water replenishment patterns during blowdown. When the blowdown valve is opened, the water level in the storage tank will continuously rise (false level), so the feedwater pump output should be increased (note that this should not exceed the rated output of the electric pump); when the blowdown valve is closed, continue replenishing water until the water level in the storage tank reaches its lowest point.

[0131] When the water level begins to rise, quickly reduce the water supply flow and adjust the water level in the storage tank to normal using the overflow regulating valve; (9) During the heating and pressurization process, operators should strengthen inspections and promptly report the tightness of pressurized components. Once a problem occurs, take immediate action.

[0132] Immediately address any leaks or spills, and implement appropriate safety measures. Observe and ensure proper handling of any steam leaks.

[0133] Maintain a safe distance, promptly set up isolation zones, and prohibit unauthorized personnel from approaching;

[0134] (10) During blowdown, the water level in the storage tank or steam drum fluctuates greatly. Timely water replenishment is crucial, and the feedwater flow rate should be controlled to be no lower than the manufacturer's specified protection value. Regularly monitor the deaerator water level and replenish water promptly. If the water replenishment is insufficient, [further action should be taken].

[0135] Contact the commissioning personnel immediately to reduce the rate of load change;

[0136] (11) The thermal expansion and reaction force of the temporary blow-out system shall be calculated by a qualified design unit to ensure the safe operation of the temporary system. During the blow-out period, all parties shall work together to strengthen the expansion inspection of the temporary pipeline supports and hangers, and keep good records of the expansion at each stage.

[0137] (12) Temporary system drains must be installed separately; during the heating and pressurization process, check the drains regularly to ensure they are unobstructed and purge the system.

[0138] Preheating work must be done before each pipe;

[0139] (13) A designated person should be responsible for safety patrols. Before each blowdown, the person should check and confirm that no one is working near the temporary systems and exhaust ports, and report to the blowdown commander and operator before proceeding with the blowdown operation. The exhaust direction of the exhaust port should point towards an open and unoccupied area, and a sufficiently large warning area should be set up in the exhaust direction with sufficiently conspicuous warning signs. Personnel should be assigned to strengthen patrols to prevent anyone from accidentally entering the exhaust area during the blowdown phase.

[0140] (14) Installation personnel must obtain permission from the commissioning personnel before disassembling or assembling the target plate and cleaning the pellet collector. When disassembling or assembling the target plate, the temporary blow-off door should be tightly closed, the power should be turned off, and the temporary blow-off door operation token should be removed. After verifying that the target plate has been restored, personnel should safely evacuate.

[0141] Afterwards, return the temporary blow-out operation token; this is considered as permission to blow the blow-out pipe, and no personnel are allowed to linger at the site.

[0142] (15) The temporary blowdown system must be designed and verified by a qualified design unit, and the temporary pipeline support must be...

[0143] After verification and calculation, it is sufficient to resist the maximum reaction force that may occur during exhaust;

[0144] (16) Install a silencer, set up a safety zone around the silencer and have a dedicated person to guard it, avoid blowing the pipe at night as much as possible, and issue a public notice in advance to notify the surrounding residents and personnel;

[0145] (17) Check and verify the thermal measuring points and the calculated feedwater flow rate, ensuring temperature correction is included; verify the water level in the storage tank; verify the temperature of the desuperheating water regulating valve and the consistency of the temperature before and after the desuperheating water flow. For accidental conditions involving a sudden drop in feedwater flow rate, [further details are needed].

[0146] Rapid response requires familiarity with the coordination of water supply flow and fuel quantity under different loads;

[0147] (18) Check and verify the water level range of the storage tank to confirm the signal is correct. On-site check that the positive and negative pressure side gauge pipe routing of the water level gauge meets the requirements of the drawing. When manually adjusting the steam temperature, the proportion of desuperheating water should be controlled according to the load. During low load periods, it is also important to ensure that the opening of the desuperheating water regulating valve is not too large. If the opening is increased while the desuperheating range remains unchanged, a large amount of desuperheating water will cause water blockage, and the steam temperature will drop suddenly when the load increases.

[0148] Based on the same inventive concept, this application also provides a steam extraction pipeline blowing device for a molten salt energy storage system, which can be used to implement the method described in the above embodiments, as described in the following embodiments. Since the principle of the steam extraction pipeline blowing device for a large molten salt energy storage system is similar to the steam extraction pipeline blowing method for a large molten salt energy storage system, the implementation of the steam extraction pipeline blowing device for a large molten salt energy storage system can refer to the implementation of the method based on software performance benchmarks, and will not be repeated. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0149] In one embodiment, see Figure 6 To address the problems of low efficiency, long processing time, energy waste, and multiple shutdowns for cooling in traditional molten salt energy storage systems' extraction steam pipeline blowing process, this application provides a molten salt energy storage system extraction steam pipeline blowing device, comprising:

[0150] The valve closing unit 601 is used to control the electric valves of the main steam branch pipes connected to the adjacent unit boilers, the electric valves of the cold re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the hot re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the pipes from the main steam superheat heat exchanger to the main steam condensing subcool heat exchanger, and the temporary blow-off valve in the molten salt energy storage system to be in the closed state.

[0151] The valve opening unit 602 is used to control the electric doors along the purging pipeline in the molten salt energy storage system to be in the open state; wherein, the purging pipeline includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a fourth temporary pipeline, and a steam extraction pipeline in the molten salt energy storage system that participates in the purging.

[0152] The first blowdown unit 603 is used to perform the first stage of blowdown on the purging pipeline using the main steam from the original unit boiler as the steam source; wherein, the pressure of the main steam is controlled according to a predetermined blowdown coefficient;

[0153] The second blowdown unit 604 is used to perform a second stage of blowdown on the purging pipeline after the furnace is shut down and cooled, using the main steam as the steam source.

[0154] The third blowdown unit 605 is used to perform a third stage of blowdown on the purging pipeline after the furnace is shut down for cooling and the exhaust steam at the silencer is clean and free of impurities, using the main steam as the steam source; wherein, the blowdown ends when the marks on the target plate are detected to meet the preset blowdown termination conditions.

[0155] In one embodiment, see Figure 7 The first blowpipe unit 603 includes:

[0156] Boiler operation module 701 is used to control the original unit boiler to sequentially perform water filling, cold flushing, boiler ignition, hot flushing and pressurization.

[0157] The warm-up operation module 702 is used to control the gradual opening of the purge valve, using the main steam as the steam source to warm up the purging pipeline;

[0158] The test blowing operation module 703 is used to perform the test blowing process in the first stage of blowing after the pipe has been fully warmed up;

[0159] The coefficient determination module 704 is used to determine the blowing coefficient based on the steam flow rate under rated operating conditions, the steam specific volume under rated operating conditions, the real-time collected steam flow rate under blowing conditions, and the steam specific volume under blowing conditions during the test blowing process.

[0160] The pressure determination module 705 is used to adjust the test blowpipe pressure according to the blowpipe coefficient, and to determine the formal blowpipe pressure according to the test blowpipe pressure.

[0161] The formal blowing module 706 is used to perform the formal blowing process in the first stage of blowing according to the formal blowing pressure; wherein, when the number of formal blowings in the first stage of blowing reaches the first preset number of blowings, the first stage of blowing ends and the furnace is shut down for cooling.

[0162] In one embodiment, see Figure 8 The second blowpipe unit 604 includes:

[0163] The second blowdown module 801 is used to perform a second stage of blowdown based on the main steam as the steam source and the formal blowdown pressure.

[0164] The second silencer detection module 802 is used to detect whether the exhaust of the silencer is clean and free of impurities when the number of blow-throughs in the second stage reaches the second preset number of blow-throughs.

[0165] The second shutdown cooling module 803 is used to perform test firing and end the second stage of blowing pipes, and then shut down the furnace for cooling.

[0166] In one embodiment, see Figure 9 The third blowpipe unit 605 includes:

[0167] The third blowdown module 901 is used to perform the third stage of blowdown based on the main steam as the steam source and the formal blowdown pressure.

[0168] The third muffler detection module 902 is used to conduct formal target firing when the exhaust steam from the muffler is detected to be clean and free of impurities.

[0169] The third shutdown cooling module 903 is used to detect whether the marks on the target plate meet the preset blow-off end conditions; if so, the third stage of blow-off is terminated; wherein, the blow-off end conditions include the mark size and the number of marks.

[0170] From a hardware perspective, in order to solve the problems of low efficiency, long time consumption, energy waste, and multiple shutdowns for cooling in the traditional molten salt energy storage system's steam extraction pipeline blowing process, this application provides an embodiment of an electronic device for implementing all or part of the aforementioned large-scale molten salt energy storage system's steam extraction pipeline blowing method. The electronic device specifically includes the following components:

[0171] The system comprises a processor, a memory, a communications interface, and a bus; wherein the processor, memory, and communications interface communicate with each other via the bus; the communications interface is used to realize information transmission between the steam extraction pipeline blowing device of the large molten salt energy storage system and the core business system, user terminals, and related databases and other related equipment; the logic controller can be a desktop computer, tablet computer, or mobile terminal, etc., and this embodiment is not limited to these. In this embodiment, the logic controller can be implemented with reference to the embodiments of the steam extraction pipeline blowing method of the large molten salt energy storage system and the embodiments of the steam extraction pipeline blowing device of the large molten salt energy storage system, the contents of which are incorporated herein by reference, and repeated details will not be described again.

[0172] It is understood that the user terminal may include smartphones, tablet computers, network set-top boxes, portable computers, desktop computers, personal digital assistants (PDAs), in-vehicle devices, smart wearable devices, etc. Among these, the smart wearable devices may include smart glasses, smartwatches, smart bracelets, etc.

[0173] In practical applications, the steam extraction pipeline blowing method for large-scale molten salt energy storage systems can be partially executed on the electronic equipment side as described above, or all operations can be completed in the client device. The choice can be made based on the processing power of the client device and the limitations of the user's usage scenario. This application does not impose any limitations on this. If all operations are completed in the client device, the client device may further include a processor.

[0174] The aforementioned client device may have a communication module (i.e., a communication unit) that can communicate with a remote server to achieve data transmission. The server may include a server on the task scheduling center side; in other implementation scenarios, it may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, a server cluster consisting of multiple servers, or a distributed server structure.

[0175] Figure 10 This is a schematic block diagram illustrating the system configuration of the electronic device 9600 according to an embodiment of this application. Figure 10 As shown, the electronic device 9600 may include a central processing unit 9100 and a memory 9140; the memory 9140 is coupled to the central processing unit 9100. It is worth noting that... Figure 10 This is an example; other types of structures can also be used to supplement or replace this structure to achieve telecommunications functions or other functions.

[0176] In one embodiment, the steam extraction pipeline blowing method function of a large molten salt energy storage system can be integrated into a central processing unit 9100. The central processing unit 9100 can be configured to perform the following control:

[0177] S101: Control the electric valves of the main steam branch pipes connected to the adjacent unit boilers, the electric valves of the cold re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the hot re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the pipes from the main steam superheat heat exchanger to the main steam condensing subcool heat exchanger, and the temporary blow-out valve in the molten salt energy storage system to be in the closed state.

[0178] S102: Control the electric gates along the purging pipeline in the molten salt energy storage system to be in the open state; wherein, the purging pipeline includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a fourth temporary pipeline, and a steam extraction pipeline in the molten salt energy storage system that participates in the purging.

[0179] S103: Using the main steam from the original unit boiler as the steam source, the first stage of purging is performed on the purging pipeline; wherein, the pressure of the main steam is controlled according to a predetermined purging coefficient;

[0180] S104: After the furnace is shut down and cooled, the main steam is used as the steam source to perform the second stage of blowing on the purging pipeline;

[0181] S105: After the furnace is shut down for cooling and the exhaust steam at the silencer is found to be clean and free of debris, the main steam is used as the steam source to perform the third stage of blowing on the purging pipeline; wherein, when the marks on the target plate are detected to meet the preset blowing end conditions, the blowing is terminated.

[0182] As can be seen from the above description, the steam extraction pipeline blowing system for the large-scale molten salt energy storage system provided in this application can connect the main steam extraction pipeline and the hot re-extraction pipeline of the molten salt energy storage system in series for energy storage, realize pressure reduction blowing, and solve the problems of traditional molten salt energy storage systems that require segmented purging for steam extraction pipeline blowing, resulting in low efficiency, long time consumption, large energy waste, and the need for multiple furnace shutdowns for cooling.

[0183] In another embodiment, the steam extraction pipeline blowing device of the large molten salt energy storage system can be configured separately from the central processing unit 9100. For example, the data composite transmission device of the steam extraction pipeline blowing device of the large molten salt energy storage system can be configured as a chip connected to the central processing unit 9100, and the function of the steam extraction pipeline blowing method of the large molten salt energy storage system can be realized through the control of the central processing unit.

[0184] like Figure 10 As shown, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily need to include these components. Figure 10 All components shown; in addition, the electronic device 9600 may also include Figure 10 For components not shown, please refer to existing technologies.

[0185] like Figure 10 As shown, the central processing unit 9100, sometimes also referred to as a controller or operating control, may include a microprocessor or other processor device and / or logic device, which receives inputs and controls the operation of various components of the electronic device 9600.

[0186] The memory 9140 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned failure-related information, and also store a program for executing that information. The central processing unit 9100 may execute the program stored in the memory 9140 to perform information storage or processing, etc.

[0187] Input unit 9120 provides input to central processing unit 9100. Input unit 9120 may be, for example, a keypad or touch input device. Power supply 9170 provides power to electronic device 9600. Display 9160 displays images and text. Display may be, for example, an LCD display, but is not limited thereto.

[0188] The memory 9140 can be a solid-state memory, such as a read-only memory (ROM), random access memory (RAM), a SIM card, etc. It can also be a memory that retains information even when power is off, can be selectively erased, and contains more data; examples of this type of memory are sometimes referred to as EPROMs. The memory 9140 can also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142 for storing application programs and function programs or processes for executing the operation of the electronic device 9600 via the central processing unit 9100.

[0189] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for the electronic device's communication functions and / or for performing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0190] The communication module 9110 is a transmitter / receiver that sends and receives signals via the antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processing unit 9100 to provide input signals and receive output signals, which is the same as in a conventional mobile communication terminal.

[0191] Based on different communication technologies, multiple communication modules 9110 can be configured in the same electronic device, such as cellular network modules, Bluetooth modules, and / or wireless LAN modules. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby realizing typical telecommunications functions. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. Additionally, the audio processor 9130 is also coupled to a central processing unit 9100, enabling on-device recording via the microphone 9132 and on-device playback of stored sound via the speaker 9131.

[0192] Embodiments of this application also provide a computer-readable storage medium capable of implementing all steps of the steam extraction pipeline blowing method for a large molten salt energy storage system with a server or client as the execution subject in the above embodiments. The computer-readable storage medium stores a computer program that, when executed by a processor, implements all steps of the steam extraction pipeline blowing method for a large molten salt energy storage system with a server or client as the execution subject in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0193] S101: Control the electric valves of the main steam branch pipes connected to the adjacent unit boilers, the electric valves of the cold re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the hot re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the pipes from the main steam superheat heat exchanger to the main steam condensing subcool heat exchanger, and the temporary blow-out valve in the molten salt energy storage system to be in the closed state.

[0194] S102: Control the electric gates along the purging pipeline in the molten salt energy storage system to be in the open state; wherein, the purging pipeline includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a fourth temporary pipeline, and a steam extraction pipeline in the molten salt energy storage system that participates in the purging.

[0195] S103: Using the main steam from the original unit boiler as the steam source, the first stage of purging is performed on the purging pipeline; wherein, the pressure of the main steam is controlled according to a predetermined purging coefficient;

[0196] S104: After the furnace is shut down and cooled, the main steam is used as the steam source to perform the second stage of blowing on the purging pipeline;

[0197] S105: After the furnace is shut down for cooling and the exhaust steam at the silencer is found to be clean and free of debris, the main steam is used as the steam source to perform the third stage of blowing on the purging pipeline; wherein, when the marks on the target plate are detected to meet the preset blowing end conditions, the blowing is terminated.

[0198] As can be seen from the above description, the steam extraction pipeline blowing system for the large-scale molten salt energy storage system provided in this application can connect the main steam extraction pipeline and the hot re-extraction pipeline of the molten salt energy storage system in series for energy storage, realize pressure reduction blowing, and solve the problems of traditional molten salt energy storage systems that require segmented purging for steam extraction pipeline blowing, resulting in low efficiency, long time consumption, large energy waste, and the need for multiple furnace shutdowns for cooling.

[0199] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0200] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0201] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0202] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0203] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for blowing steam through the extraction pipeline of a molten salt energy storage system, applied to the steam extraction pipeline blowing system of a molten salt energy storage system, characterized in that, include: When a blow-off command is received, the electric valves of the main steam branch pipes connected to the adjacent unit boilers, the electric valves of the cold re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the hot re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the pipes from the main steam superheat heat exchanger to the main steam condensing subcool heat exchanger, and the emergency blow-off valve in the molten salt energy storage system are kept closed. The electric gates along the purging pipeline in the molten salt energy storage system are controlled to be in the open state; wherein, the purging pipeline includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a fourth temporary pipeline, and a steam extraction pipeline in the molten salt energy storage system that participates in the purging. Using the main steam from the original unit boiler as the steam source, the first stage of purging is carried out on the purging pipeline; wherein, the pressure of the main steam is controlled according to a predetermined purging coefficient; After the furnace is shut down and cooled, the main steam is used as the steam source to perform the second stage of blowing on the purging pipeline; After the furnace is shut down for cooling and the exhaust steam at the silencer is checked to be clean and free of impurities, the main steam is used as the steam source to perform the third stage of blowing on the purging pipeline; wherein, the blowing is terminated when the marks on the target plate are detected to meet the preset blowing termination conditions. The molten salt energy storage system's steam extraction pipeline blowing system includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a temporary blowing valve and a target plate; and a fourth temporary pipeline and a silencer. The first temporary pipeline is installed between the inlet and outlet of the main steam superheater in the molten salt energy storage system to short-circuit the main steam superheater; the second temporary pipeline is installed between the inlet and outlet of the hot reheater in the molten salt energy storage system to short-circuit the hot reheater; the cold reheater branch pipeline in the molten salt energy storage system is connected to the hot reheater branch pipeline in the molten salt energy storage system through the third temporary pipeline; the temporary blow-off valve and the target plate are sequentially installed on the third temporary pipeline; the fourth temporary pipeline and the silencer are installed at the outlet of the hot reheater.

2. The steam extraction pipeline blowing method for a molten salt energy storage system according to claim 1, characterized in that, The first stage of purging the purging pipeline, using the main steam from the original unit boiler as the steam source, includes: The original unit boiler is controlled to sequentially perform water filling, cold flushing, boiler ignition, hot flushing, and pressurization; The blow-off valve is gradually opened to warm up the purging pipeline using the main steam as the steam source. After the pipe has been warmed up sufficiently, the test blowing process in the first stage of pipe blowing is carried out. During the test blowing process, the blowing coefficient is determined based on the steam flow rate under rated operating conditions, the steam specific volume under rated operating conditions, the real-time collected steam flow rate under blowing conditions, and the steam specific volume under blowing conditions. Adjust the test blowpipe pressure according to the blowpipe coefficient, and determine the formal blowpipe pressure according to the test blowpipe pressure; The formal blowing process in the first stage of blowing is carried out according to the formal blowing pressure; wherein, when the number of formal blowings in the first stage of blowing reaches the first preset number of blowings, the first stage of blowing ends and the furnace is shut down for cooling.

3. The steam extraction pipeline blowing method for a molten salt energy storage system according to claim 2, characterized in that, The second stage of purging the purging pipeline using the main steam as the steam source includes: Using the main steam as the steam source, the second stage of blowing is carried out according to the formal blowing pressure; When the number of blow-throughs in the second stage reaches the second preset number of blow-throughs, check whether the exhaust from the silencer is clean and free of impurities; If so, conduct a test firing, end the second stage of blowdown, and shut down the furnace for cooling.

4. The steam extraction pipeline blowing method for a molten salt energy storage system according to claim 2, characterized in that, The third stage of purging the purging pipeline using the main steam as the steam source includes: Using the main steam as the steam source, the third stage of blowing is carried out according to the formal blowing pressure; When the exhaust from the muffler is detected to be clean and free of impurities, the actual target firing will commence. Detect whether the marks on the target plate meet the preset blowpipe termination conditions; if so, end the third stage of blowpipe blowing; wherein, the blowpipe termination conditions include the mark size and the number of marks.

5. A steam extraction pipeline blowing device for a molten salt energy storage system, applied to the steam extraction pipeline blowing system of a molten salt energy storage system, characterized in that, include: The valve closing unit is used to control the electric valves of the main steam branch pipes connected to the adjacent unit boilers, the electric valves of the cold re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the hot re-steam branch pipes connected to the adjacent unit boilers, the electric valves of the pipes from the main steam superheat heat exchanger to the main steam condensing subcool heat exchanger, and the temporary blow-off valve in the molten salt energy storage system to be in the closed state. A valve opening unit is used to control the electric doors along the purging pipeline in the molten salt energy storage system to be in the open state; wherein, the purging pipeline includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a fourth temporary pipeline, and a steam extraction pipeline in the molten salt energy storage system that participates in purging; The first blowdown unit is used to perform the first stage of blowdown on the purging pipeline using the main steam from the original unit boiler as the steam source; wherein the pressure of the main steam is controlled according to a predetermined blowdown coefficient; The second blowdown unit is used to perform a second stage of blowdown on the purging pipeline after the furnace is shut down and cooled, using the main steam as the steam source. The third blowdown unit is used to perform the third stage of blowdown on the purging pipeline after the furnace is shut down for cooling and the exhaust steam at the silencer is clean and free of impurities. The blowdown is terminated when the marks on the target plate meet the preset blowdown termination conditions. The molten salt energy storage system's steam extraction pipeline blowing system includes a first temporary pipeline, a second temporary pipeline, a third temporary pipeline, a temporary blowing valve and a target plate; and a fourth temporary pipeline and a silencer. The first temporary pipeline is installed between the inlet and outlet of the main steam superheater in the molten salt energy storage system to short-circuit the main steam superheater; the second temporary pipeline is installed between the inlet and outlet of the hot reheater in the molten salt energy storage system to short-circuit the hot reheater; the cold reheater branch pipeline in the molten salt energy storage system is connected to the hot reheater branch pipeline in the molten salt energy storage system through the third temporary pipeline; the temporary blow-off valve and the target plate are sequentially installed on the third temporary pipeline; the fourth temporary pipeline and the silencer are installed at the outlet of the hot reheater.

6. The steam extraction pipeline blowing device for the molten salt energy storage system according to claim 5, characterized in that, The first blowpipe unit includes: The boiler operation module is used to control the original unit boiler to sequentially perform water filling, cold flushing, boiler ignition, hot flushing and pressurization; The warm-up operation module is used to control the gradual opening of the purge valve, using the main steam as the steam source, to warm up the purging pipeline; The test blowing operation module is used to perform the test blowing process in the first stage of blowing after the pipe has been fully warmed up; The coefficient determination module is used to determine the blowing coefficient based on the steam flow rate under rated operating conditions, the steam specific volume under rated operating conditions, and the real-time collected steam flow rate and steam specific volume under blowing conditions during the test blowing process. The pressure determination module is used to adjust the test blowpipe pressure according to the blowpipe coefficient, and to determine the formal blowpipe pressure according to the test blowpipe pressure. The formal blowing module is used to perform the formal blowing process in the first stage of blowing according to the formal blowing pressure; wherein, when the number of formal blowings in the first stage of blowing reaches the first preset number of blowings, the first stage of blowing ends and the furnace is shut down for cooling.

7. The steam extraction pipeline blowing device for the molten salt energy storage system according to claim 6, characterized in that, The second blowpipe unit includes: The second blowdown module is used to perform a second stage of blowdown based on the main steam as the steam source and the formal blowdown pressure. The second silencer detection module is used to detect whether the exhaust gas from the silencer is clean and free of impurities when the number of blow-throughs in the second stage reaches the second preset number of blow-throughs. The second shutdown cooling module is used to perform test firing and end the second stage of blowing, and then shut down the furnace for cooling.

8. The steam extraction pipeline blowing device for the molten salt energy storage system according to claim 6, characterized in that, The third blowpipe unit includes: The third blowdown module is used to perform the third stage of blowdown based on the main steam as the steam source and the formal blowdown pressure. The third muffler detection module is used to conduct formal target firing when the exhaust steam from the muffler is detected to be clean and free of impurities. The third shutdown cooling module is used to detect whether the marks on the target plate meet the preset blow-off end conditions; if so, the third stage of blow-off is terminated; wherein, the blow-off end conditions include the mark size and the number of marks.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the steam extraction pipeline blowing method for the molten salt energy storage system according to any one of claims 1 to 4.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the steam extraction pipeline blowing method for the molten salt energy storage system as described in any one of claims 1 to 4.

11. A computer program product, comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the steam extraction pipeline blowing method for the molten salt energy storage system as described in any one of claims 1 to 4.

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