Control method and device of double-machine steam extraction heating fused salt heat storage system

Abstract

The invention provides a control method and device for a double-unit steam extraction heating fused salt heat storage system, and the double-unit steam extraction heating fused salt heat storage system comprises two generator sets and a set of fused salt heat storage system. Heating steam sources of a main steam overheating heat exchanger and a heat re-overheating heat exchanger of the fused salt heat storage system are taken from a first generator set; the first preset condition comprises that the power generation power of the first generator set is larger than first preset power, steam extraction and heat storage control of the second generator set is in a cut-off state, a main steam extraction isolating valve is in a closed transition state, a hot re-extraction isolating valve is in a closed state, and a cold re-extraction isolating valve is in a closed state; the invention provides a safety control interlocking logic for a double-unit steam extraction heating fused salt heat storage system, so that the error rate of manual operation of operators can be greatly reduced, the safety and the reliability in a double-unit steam extraction heat storage state are enhanced, and the safety of equipment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation coupled with molten salt heat storage and release for thermal power peak shaving, and particularly relates to a control method and device for a dual-unit extraction steam heating molten salt heat storage system. Background Art

[0002] At present, with the rapid and profound changes in the power system, improving the flexibility of cogeneration units has become one of the important issues in the construction of a new power system. By configuring a molten salt heat storage system in a thermal power unit, the deep peak shaving capacity of the unit can be achieved while ensuring the maximum heat supply. In recent years, the steam extraction heating molten salt scheme for steam turbines has received extensive attention in the area of thermal power flexibility transformation. For a dual-unit extraction steam heating molten salt heat storage system, there are problems such as complex system and immature operation. There are too many unsafe factors during the system commissioning process, and the risk of safe operation of equipment is high. Summary of the Invention

[0003] A control method and device for a dual-unit extraction steam heating molten salt heat storage system provided by the present invention aims to reduce the error rate of manual operations by operators, enhance the safety and reliability of the unit under the steam extraction and heat storage state, and ensure the safety of equipment.

[0004] To achieve the above object, in a first aspect, the present invention provides a control method for a dual-unit extraction steam heating molten salt heat storage system. The dual-unit extraction steam heating molten salt heat storage system includes: two generating sets and a set of molten salt heat storage system. The control method includes:

[0005] When a first preset condition is satisfied, the heating steam sources of the main steam superheater and the hot reheat superheater of the molten salt heat storage system are taken from the first generating set. The first preset condition includes: the power generation of the first generating set is greater than a first preset power, the extraction steam heat storage control of the second generating set is in a cut-off state, the main steam extraction isolation valve is in a closed state, the hot reheat extraction isolation valve is in a closed state, and the cold reheat isolation valve is in a closed state;

[0006] When a second preset condition is satisfied, the heating steam sources of the main steam superheater and the hot reheat superheater of the molten salt heat storage system are taken from the second generating set. The second preset condition includes: the power generation of the second generating set is greater than a second preset power, the extraction steam heat storage control of the first generating set is in a cut-off state, the main steam extraction isolation valve is in a closed state, the hot reheat extraction isolation valve is in a closed state, and the cold reheat isolation valve is in a closed state.

[0007] In some embodiments of the present invention, the main steam extraction isolation valve of the first generating unit is arranged on the pipeline connecting the pipeline between the boiler of the first generating unit and the high-pressure cylinder of the first generating unit and the main steam superheater heat exchanger; the hot reheat extraction isolation valve of the first generating unit is placed on the pipeline connecting the pipeline between the boiler of the first generating unit and the intermediate-pressure cylinder of the first generating unit and the reheated superheater heat exchanger;

[0008] The main steam extraction isolation valve of the second generating unit is arranged on the pipeline connecting the pipeline between the boiler of the second generating unit and the high-pressure cylinder of the second generating unit and the main steam superheater heat exchanger; the hot reheat extraction isolation valve of the second generating unit is placed on the pipeline connecting the pipeline between the boiler of the second generating unit and the intermediate-pressure cylinder of the second generating unit and the reheated superheater heat exchanger.

[0009] In some embodiments of the present invention, a control method for a dual-unit extraction heating molten salt thermal energy storage system further includes:

[0010] When the third preset condition is satisfied, the main steam extraction control of the first generating unit is put into operation; the third preset condition includes: the extraction thermal energy storage control and the re-extraction control of the first generating unit are in the input state;

[0011] When the fourth preset condition is satisfied, the main steam extraction control of the second generating unit is put into operation; the fourth preset condition includes: the extraction thermal energy storage control and the re-extraction control of the second generating unit are in the input state.

[0012] In some embodiments of the present invention, a control method for a dual-unit extraction heating molten salt thermal energy storage system further includes:

[0013] When the fifth preset condition is satisfied, the main steam extraction control of the first generating unit is cut off; the fifth preset condition includes at least one of the following: the main fuel trip, turbine trip, and generator disconnection of the boiler of the first generating unit;

[0014] When the sixth preset condition is satisfied, the main steam extraction control of the second generating unit is cut off; the sixth preset condition includes at least one of the following: the main fuel trip, turbine trip, and generator disconnection of the boiler of the second generating unit.

[0015] In some embodiments of the present invention, the fifth preset condition further includes:

[0016] The inlet steam flow rate of the main steam superheater heat exchanger is less than the first preset flow rate, or the opening degree of the inlet regulating valve of the main steam superheater heat exchanger is less than the first preset opening degree;

[0017] In some embodiments of the present invention, the sixth preset condition further includes:

[0018] The steam inlet flow rate of the main steam superheater heat exchanger is less than a second preset flow rate, or the opening degree of the steam inlet regulating valve of the main steam superheater heat exchanger is less than a second preset opening degree.

[0019] In some embodiments of the present invention, a control method for a dual-unit extraction heating molten salt thermal energy storage system further includes:

[0020] When the main steam extraction control of the first generating unit is in the input state, the main steam extraction isolation valve of the first generating unit and the molten salt inlet regulating valve of the main steam superheater heat exchanger have opening permission; and

[0021] The main steam extraction isolation valve, cold reheat isolation valve, molten salt inlet isolation valve, and molten salt outlet isolation valve of the main steam superheater heat exchanger of the first generating unit are kept in the open state;

[0022] When the main steam extraction control of the second generating unit is in the input state, the main steam extraction isolation valve of the second generating unit and the molten salt inlet regulating valve of the main steam superheater heat exchanger have opening permission; and

[0023] The main steam extraction isolation valve, cold reheat isolation valve, molten salt inlet isolation valve, and molten salt outlet isolation valve of the main steam superheater heat exchanger of the second generating unit are kept in the open state.

[0024] In some embodiments of the present invention, the cold reheat isolation valve of the first generating unit is arranged on the pipeline connecting the pipeline between the boiler of the first generating unit and the high-pressure cylinder of the first generating unit and the main steam superheater heat exchanger;

[0025] The cold reheat isolation valve of the second generating unit is arranged on the pipeline connecting the pipeline between the boiler of the second generating unit and the high-pressure cylinder of the second generating unit and the main steam superheater heat exchanger.

[0026] In a second aspect, the present invention provides a control device for a dual-unit extraction heating molten salt thermal energy storage system. The dual-unit extraction heating molten salt thermal energy storage system includes: two generating units and a set of molten salt thermal energy storage systems. The control device includes:

[0027] The first unit heat extraction module is used to, when a first preset condition is satisfied, take the heating steam source of the main steam superheater heat exchanger and the hot reheat superheater heat exchanger of the molten salt thermal energy storage system from the first generating unit. The first preset condition includes: the power generation of the first generating unit is greater than a first preset power, the extraction thermal energy storage control of the second generating unit is in the cut-off state, the main steam extraction isolation valve is in the closed state, the hot reheat extraction isolation valve is in the closed state, and the cold reheat isolation valve is in the closed state;

[0028] The second unit heat extraction module is used to obtain the heating steam source of the main steam superheater and the reheat steam superheater of the molten salt thermal energy storage system from the second generating unit when the second preset condition is satisfied; the second preset condition includes: the power generation power of the second generating unit is greater than the second preset power, and the extraction steam thermal energy storage control of the first generating unit is in the cut-off state.

[0029] In some embodiments of the present invention, the main steam extraction isolation valve of the first generating unit is arranged on the pipeline connecting the pipeline between the boiler of the first generating unit and the high-pressure cylinder of the first generating unit and the main steam superheater; the reheat steam extraction isolation valve of the first generating unit is arranged on the pipeline connecting the pipeline between the boiler of the first generating unit and the intermediate-pressure cylinder of the first generating unit and the reheat superheater;

[0030] The main steam extraction isolation valve of the second generating unit is arranged on the pipeline connecting the pipeline between the boiler of the second generating unit and the high-pressure cylinder of the second generating unit and the main steam superheater; the reheat steam extraction isolation valve of the second generating unit is arranged on the pipeline connecting the pipeline between the boiler of the second generating unit and the intermediate-pressure cylinder of the second generating unit and the reheat superheater.

[0031] In some embodiments of the present invention, a control device for a dual-unit extraction steam heating molten salt thermal energy storage system further includes:

[0032] The first unit main steam extraction control input module is used to input the main steam extraction control of the first generating unit when the third preset condition is satisfied; the third preset condition includes: the extraction steam thermal energy storage control and the re-extraction steam control of the first generating unit are in the input state;

[0033] The second unit main steam extraction control input module is used to input the main steam extraction control of the second generating unit when the fourth preset condition is satisfied; the fourth preset condition includes: the extraction steam thermal energy storage control and the re-extraction steam control of the second generating unit are in the input state.

[0034] In some embodiments of the present invention, a control device for a dual-unit extraction steam heating molten salt thermal energy storage system further includes:

[0035] The first unit main steam extraction control cut-off module is used to cut off the main steam extraction control of the first generating unit when the fifth preset condition is satisfied; the fifth preset condition includes at least one of the following: the main fuel trip, turbine trip, and generator disconnection of the boiler of the first generating unit;

[0036] The main steam extraction control cut-off module of the second unit is used to cut off the main steam extraction control of the second generating unit when the sixth preset condition is met; the sixth preset condition includes at least one of the following: the main fuel trip of the boiler of the second generating unit, the turbine trip, and the generator disconnection.

[0037] In some embodiments of the present invention, the fifth preset condition further includes:

[0038] The inlet steam flow rate of the main steam superheater heat exchanger is less than the first preset flow rate, or the opening degree of the inlet regulating valve of the main steam superheater heat exchanger is less than the first preset opening degree;

[0039] The sixth preset condition further includes:

[0040] The inlet steam flow rate of the main steam superheater heat exchanger is less than the second preset flow rate, or the opening degree of the inlet regulating valve of the main steam superheater heat exchanger is less than the second preset opening degree.

[0041] In some embodiments of the present invention, a control device for a dual-unit extraction heating molten salt thermal energy storage system further includes:

[0042] The valve opening permission module of the first unit is used to allow the opening of the main steam extraction isolation valve of the first generating unit and the molten salt inlet regulating valve of the main steam superheater heat exchanger when the main steam extraction control of the first generating unit is in the input state; and

[0043] For the main steam extraction isolation valve, cold reheat isolation valve, molten salt inlet isolation valve, and molten salt outlet isolation valve of the first generating unit to remain in the open state;

[0044] The valve opening permission module of the second unit is used to allow the opening of the main steam extraction isolation valve of the second generating unit and the molten salt inlet regulating valve of the main steam superheater heat exchanger when the main steam extraction control of the second generating unit is in the input state; and

[0045] For the main steam extraction isolation valve, cold reheat isolation valve, molten salt inlet isolation valve, and molten salt outlet isolation valve of the second generating unit to remain in the open state.

[0046] In some embodiments of the present invention, the cold reheat isolation valve of the first generating unit is arranged on the pipeline connecting the pipeline between the boiler of the first generating unit and the high-pressure cylinder of the first generating unit and the main steam superheater heat exchanger;

[0047] The cold reheat isolation valve of the second generating unit is arranged on the pipeline connecting the pipeline between the boiler of the second generating unit and the high-pressure cylinder of the second generating unit and the main steam superheater heat exchanger.

[0048] In a third aspect, the present invention provides a computer program product, including a computer program / instructions, which, when executed by a processor, implement the steps of a control method for a dual-unit extraction steam heating molten salt thermal energy storage system.

[0049] In a fourth aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the steps of a control method for a dual-unit extraction steam heating molten salt thermal energy storage system.

[0050] In a fifth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of a control method for a dual-unit extraction steam heating molten salt thermal energy storage system.

[0051] As can be seen from the above description, a control method and device for a dual-unit extraction steam heating molten salt thermal energy storage system provided by an embodiment of the present invention, the corresponding method includes: when a first preset condition is satisfied, the heating steam sources of the main steam superheater and the hot reheat superheater of the molten salt thermal energy storage system are taken from the first generating unit; the first preset condition includes: the power generation power of the first generating unit is greater than a first preset power, the extraction steam thermal energy storage control of the second generating unit is in a cut-off state, the main steam extraction isolation valve is in a closed state, the hot reheat extraction isolation valve is in a closed state, and the cold reheat isolation valve is in a closed state; when a second preset condition is satisfied, the heating steam sources of the main steam superheater and the hot reheat superheater of the molten salt thermal energy storage system are taken from the second generating unit; the second preset condition includes: the power generation power of the second generating unit is greater than a second preset power, the extraction steam thermal energy storage control of the first generating unit is in a cut-off state, the main steam extraction isolation valve is in a closed state, the hot reheat extraction isolation valve is in a closed state, and the cold reheat isolation valve is in a closed state.

[0052] In summary, the present invention provides a safety control interlock logic for a dual-unit extraction steam heating molten salt thermal energy storage system, greatly reducing the error rate of manual operations by operators, enhancing the safety and reliability in the state of dual-unit extraction steam thermal energy storage, and ensuring the safety of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0054] Figure 1 Flow schematic diagram of a control method for a dual-unit extraction steam heating molten salt thermal energy storage system provided in an embodiment of the present invention Figure 1 ;

[0055] Figure 2 It is a structural schematic diagram of a dual - machine extraction - steam heating molten - salt thermal energy storage system provided in an embodiment of the present invention;

[0056] Figure 3 It is a flow schematic diagram of a control method for a dual - machine extraction - steam heating molten - salt thermal energy storage system provided in an embodiment of the present invention Figure 2 ;

[0057] Figure 4 It is a flow schematic diagram of a control method for a dual - machine extraction - steam heating molten - salt thermal energy storage system provided in an embodiment of the present invention Figure 3 ;

[0058] Figure 5 It is a flow schematic diagram of a control method for a dual - machine extraction - steam heating molten - salt thermal energy storage system provided in an embodiment of the present invention Figure 4 ;

[0059] Figure 6 It is a schematic diagram of the normal input process of the extraction - steam thermal energy storage of Unit #1 provided in a specific application example of the present invention;

[0060] Figure 7 It is a schematic diagram of the normal withdrawal process of the extraction - steam thermal energy storage of Unit #1 provided in a specific application example of the present invention;

[0061] Figure 8 It is a schematic diagram of the rapid - protection withdrawal process of the extraction - steam thermal energy storage of Unit #1 provided in a specific application example of the present invention;

[0062] Figure 9 It is a schematic diagram of the slow - protection withdrawal process of the extraction - steam thermal energy storage of Unit #1 provided in a specific application example of the present invention;

[0063] Figure 10 It is a structural schematic diagram of a control device for a dual - machine extraction - steam heating molten - salt thermal energy storage system provided in an embodiment of the present invention Figure 1 ;

[0064] Figure 11 It is a structural schematic diagram of a control device for a dual - machine extraction - steam heating molten - salt thermal energy storage system provided in an embodiment of the present invention Figure 2 ;

[0065] Figure 12 It is a structural schematic diagram of a control device for a dual - machine extraction - steam heating molten - salt thermal energy storage system provided in an embodiment of the present invention Figure 3 ;

[0066] Figure 13 It is a structural schematic diagram of a control device for a dual - machine extraction - steam heating molten - salt thermal energy storage system provided in an embodiment of the present invention Figure 4 ;

[0067] Figure 14 Schematic diagram of the structure of the electronic device in the embodiment of the present invention.

[0068] Reference numerals: 1: #1 generator set boiler; 2: #1 generator set high-pressure cylinder; 3: #1 generator set intermediate-pressure cylinder; 4: #2 generator set boiler; 5: #2 generator set high-pressure cylinder; 6: #2 generator set intermediate-pressure cylinder; 7: #1 unit main steam extraction isolation valve; 8: #1 unit hot reheat extraction isolation valve; 9: #2 generator set main steam extraction isolation valve; 10: #2 generator set hot reheat extraction isolation valve; 11: #1 generator set intermediate control valve; 12: #2 generator set intermediate control valve; 13: main steam extraction to #1 unit cold reheat isolation valve; 14: main steam extraction to #2 unit cold reheat isolation valve; 15: main steam superheater steam inlet regulating valve; 16: hot reheat superheater steam inlet regulating valve; 17: main steam superheater; 18: hot reheat superheater; 19: main steam superheater molten salt inlet isolation valve; 20: main steam superheater molten salt inlet regulating valve; 21: main steam superheater molten salt outlet isolation valve; 22: hot reheat superheater molten salt inlet isolation valve; 23: hot reheat superheater molten salt inlet regulating valve; 24: hot reheat superheater molten salt outlet isolation valve; 25: cold salt tank; 26: hot salt tank; 27: cold salt pump; 28: cold salt pump outlet valve. Detailed implementation manners

[0069] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0070] Those skilled in the art should understand that the embodiments of the present invention may be provided as a method, a system, or a computer program product. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention may take the form of a computer program product implemented 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.

[0071] It should be noted that, in the description, claims and the above drawings of this application, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0072] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0073] An embodiment of the present invention provides a specific implementation manner of a control method for a dual-unit extraction heating molten salt energy storage system. This method performs interlock control on two generator sets to ensure that only a single generator set extracts steam to heat the molten salt energy storage, achieving complete isolation of the two units and ensuring the stability of unit operation. Specifically, see Figure 1 , this method specifically includes the following content: The dual-unit extraction heating molten salt energy storage system includes: two generator sets and a set of molten salt energy storage systems:

[0074] Step 100: When the first preset condition is satisfied, the heating steam sources of the main steam superheater and the hot reheat superheater of the molten salt energy storage system are taken from the first generator set; the first preset condition includes: the power generation power of the first generator set is greater than the first preset power, the extraction heat storage control of the second generator set is in the cut-off state, the main steam extraction isolation valve is in the closed state, the hot reheat extraction isolation valve is in the closed state, and the cold reheat isolation valve is in the closed state;

[0075] Step 200: When the second preset condition is satisfied, the heating steam sources of the main steam superheater and the hot reheat superheater of the molten salt energy storage system are taken from the second generator set; the second preset condition includes: the power generation power of the second generator set is greater than the second preset power, the extraction heat storage control of the first generator set is in the cut-off state, the main steam extraction isolation valve is in the closed state, the hot reheat extraction isolation valve is in the closed state, and the cold reheat isolation valve is in the closed state.

[0076] In step 100, see Figure 2 , interlock control is performed on the two units. Specifically, an extraction heat storage control button for Unit #1 and an extraction heat storage control button for Unit #2 are set; when the extraction heat storage control button for Unit #1 is in the input state, there is no opening permission condition for the main steam extraction isolation valve 9 (the main steam extraction isolation valve 9 of the second generator set) of Unit #2, the hot reheat extraction isolation valve 10 of Unit #2, and the main steam extraction to cold reheat isolation valve 14 of Unit #2, that is, the heating steam sources of the main steam superheater and the hot reheat superheater can only be taken from Unit #1;

[0077] Continue to refer to Figure 2 In step 200, when the extraction steam heat storage button of Unit #2 is in the on state, there is no opening permission condition for the main steam extraction isolation valve 7 of Unit #1 (the main steam extraction isolation valve 7 of the first generating unit), the hot reheat extraction isolation valve 8 of Unit #1 (the hot reheat extraction isolation valve 8 of the first generating unit), and the main steam extraction to cold reheat isolation valve 13 of Unit #1. That is, the heating steam sources of the main steam superheater and the hot reheat superheater can only be taken from Unit #2.

[0078] In some embodiments of the present invention, the main steam extraction isolation valve 7 of the first generating unit is arranged on the pipeline connecting the pipeline between the boiler 1 of the first generating unit and the high-pressure cylinder 2 of the first generating unit and the main steam superheater 17; the hot reheat extraction isolation valve 8 of the first generating unit is placed on the pipeline connecting the pipeline between the boiler 1 of the first generating unit and the intermediate-pressure cylinder 3 of the first generating unit and the hot reheat superheater 18.

[0079] The main steam extraction isolation valve 9 of the second generating unit is arranged on the pipeline connecting the pipeline between the boiler 4 of the second generating unit and the high-pressure cylinder 5 of the second generating unit and the main steam superheater 17; the hot reheat extraction isolation valve 10 of the second generating unit is placed on the pipeline connecting the pipeline between the boiler 4 of the second generating unit and the intermediate-pressure cylinder 6 of the second generating unit and the hot reheat superheater 18.

[0080] In some embodiments of the present invention, refer to Figure 3 A control method for a dual-unit extraction steam heating molten salt heat storage system further includes:

[0081] Step 300: When the third preset condition is satisfied, put into the main steam extraction control of the first generating unit; the third preset condition includes: the extraction steam heat storage control and the re-extraction steam control of the first generating unit are in the on state;

[0082] Specifically, the main steam extraction control of the first generating unit can be realized through the input permission control of the main steam extraction control button of Unit #1. Then step 300 includes: if the following conditions are all satisfied, the main steam extraction control button of Unit #1 can be put into: the extraction steam heat storage control button of Unit #1 is input and the hot reheat extraction control button of Unit #1 is input.

[0083] Step 400: When the fourth preset condition is satisfied, put into the main steam extraction control of the second generating unit; the fourth preset condition includes: the extraction steam heat storage control and the re-extraction steam control of the second generating unit are in the on state.

[0084] Similar to step 300, the main steam extraction control of the second generating unit can be achieved through the enabling control of the main steam extraction control button of Unit #2. Then, step 400 includes: If all the following conditions are met, the main steam extraction control button of Unit #2 can be enabled: the extraction heat storage control button of Unit #2 is enabled and the hot reheat extraction control button of Unit #2 is enabled.

[0085] In some embodiments of the present invention, referring to Figure 4 , a control method for a dual-unit steam extraction heating molten salt heat storage system further includes:

[0086] Step 500: When the fifth preset condition is satisfied, cut off the main steam extraction control of the first generating unit; the fifth preset condition includes at least one of the following: the main fuel trip of the boiler of the first generating unit, the turbine trip, and the generator disconnection.

[0087] Specifically, if any of the following conditions is met, the main steam extraction control button of Unit #1 is automatically cut off: the main fuel trip (MFT) of the boiler of Unit #1, with a delay of 5 minutes; the turbine trip of Unit #1, with a delay of 5 minutes; and the generator disconnection of Unit #1, with a delay of 5 minutes.

[0088] Step 600: When the sixth preset condition is satisfied, cut off the main steam extraction control of the second generating unit; the sixth preset condition includes at least one of the following: the main fuel trip of the boiler of the second generating unit, the turbine trip, and the generator disconnection.

[0089] Similar to step 500, if any of the following conditions is met, the main steam extraction control button of Unit #2 is automatically cut off: the main fuel trip of the boiler of Unit #2, with a delay of 5 minutes; the turbine trip of Unit #2, with a delay of 5 minutes; and the generator disconnection of Unit #2, with a delay of 5 minutes.

[0090] In some embodiments of the present invention, the fifth preset condition further includes:

[0091] The inlet steam flow rate of the main steam superheater is less than the first preset flow rate, or the opening degree of the inlet regulating valve of the main steam superheater is less than the first preset opening degree.

[0092] Specifically, if the following conditions are all met, the main steam extraction control button of Unit #1 can be cut off: the inlet steam flow rate of the main steam superheater < the first preset flow rate (preferably, the first preset flow rate is 10 t / h); the opening degree of the inlet regulating valve of the main steam superheater is less than the first preset opening degree (preferably, the first preset opening degree is 3%).

[0093] The sixth preset condition further includes: the steam inlet flow rate of the main steam superheater heat exchanger is less than the second preset flow rate, or the opening degree of the steam inlet regulating valve of the main steam superheater heat exchanger is less than the second preset opening degree.

[0094] Specifically, if the following conditions are all met, the main steam extraction control button of #2 unit can be cut off: the steam inlet flow rate of the main steam superheater heat exchanger < the second preset flow rate (preferably, the second preset flow rate is 10 t / h); the opening degree of the steam inlet regulating valve of the main steam superheater heat exchanger is less than the second preset opening degree (preferably, the second preset opening degree is 3%).

[0095] In some embodiments of the present invention, referring to Figure 5 , a control method for a dual-unit steam extraction heating molten salt energy storage system further includes:

[0096] Step 700: When the main steam extraction control of the first generating unit is in the input state, the main steam extraction isolation valve of the first generating unit and the molten salt inlet regulating valve of the main steam superheater heat exchanger have opening permission; and

[0097] The main steam extraction isolation valve, cold reheat isolation valve, molten salt inlet isolation valve, and molten salt outlet isolation valve of the main steam superheater heat exchanger of the first generating unit are kept open;

[0098] Specifically, when the main steam extraction control button of #1 unit is in the input state, the following valves have opening permission: the main steam extraction isolation valve 7 of #1 unit; the cold reheat isolation valve 13 for the main steam extraction to #1 unit; the molten salt inlet isolation valve 19 of the main steam superheater heat exchanger; the molten salt inlet regulating valve 20 of the main steam superheater heat exchanger, and the molten salt outlet isolation valve 21 of the main steam superheater heat exchanger;

[0099] In addition, when the main steam extraction control button of #1 unit is in the input state, the following valves do not have closing permission: the main steam extraction isolation valve 7 of #1 unit; the cold reheat isolation valve 13 for the main steam extraction to #1 unit; the molten salt inlet isolation valve 19 of the main steam superheater heat exchanger, and the molten salt outlet isolation valve 21 of the main steam superheater heat exchanger.

[0100] Step 800: When the main steam extraction control of the second generating unit is in the input state, the main steam extraction isolation valve of the second generating unit and the molten salt inlet regulating valve of the main steam superheater heat exchanger have opening permission; and

[0101] The main steam extraction isolation valve, cold reheat isolation valve, molten salt inlet isolation valve, and molten salt outlet isolation valve of the second generating unit are kept open.

[0102] Similar to step 800, when the main steam extraction control button of Unit #2 is in the enabled state, the following valves are allowed to open: the main steam extraction isolation valve 9 of Unit #2; the isolation valve 14 for the main steam extraction to the cold reheat of Unit #2; the isolation valve 19 for the molten salt inlet of the main steam superheater; the regulating valve 20 for the molten salt inlet of the main steam superheater; and the isolation valve 21 for the molten salt outlet of the main steam superheater.

[0103] In addition, when the main steam extraction control button of Unit #2 is in the enabled state, the following valves are not allowed to close: the main steam extraction isolation valve 9 of Unit #2; the isolation valve 14 for the main steam extraction to the cold reheat of Unit #2; the isolation valve 19 for the molten salt inlet of the main steam superheater; and the isolation valve 21 for the molten salt outlet of the main steam superheater.

[0104] In some embodiments of the present invention, refer to Figure 2 , the cold reheat isolation valve 13 of the first generating unit is arranged on the pipeline connecting the pipeline between the boiler 1 of the first generating unit and the high-pressure cylinder 2 of the first generating unit and the main steam superheater 17;

[0105] The cold reheat isolation valve 14 of the second generating unit is arranged on the pipeline connecting the pipeline between the boiler 4 of the second generating unit and the high-pressure cylinder 5 of the second generating unit and the main steam superheater 17.

[0106] To further illustrate the present solution, the present invention provides a specific application example of the control method of the dual-unit steam extraction heating molten salt thermal energy storage system. Refer to Figure 6 、 Figure 7 、 Figure 8 And Figure 9 , which specifically includes the following content.

[0107] Based on steps 100 and 200, both the steam extraction thermal energy storage button of Unit #1 and the steam extraction thermal energy storage button of Unit #2 include enabling conditions;

[0108] Enabling conditions for the steam extraction thermal energy storage button of Unit #1. If the following conditions are all met, the steam extraction thermal energy storage button of Unit #1 can be enabled: the power generation of Unit #1 > the first preset power value; the steam extraction thermal energy storage control button of Unit #2 has been cut off; the main steam extraction isolation valve of Unit #2 has been closed; the hot reheat steam extraction isolation valve of Unit #2 has been closed; the isolation valve for the main steam extraction to the cold reheat of Unit #2 has been closed.

[0109] Enabling conditions for the steam extraction thermal energy storage button of Unit #2. If the following conditions are all met, the steam extraction thermal energy storage control button of Unit #2 can be enabled: the power generation of Unit #2 > the second preset power value; the steam extraction button of Unit #1 has been cut off; the main steam extraction isolation valve of Unit #1 has been closed; the hot reheat steam extraction isolation valve of Unit #1 has been closed; the isolation valve for the main steam extraction to the cold reheat of Unit #1 has been closed.

[0110] In addition, the extraction steam heat storage control buttons for Unit #1 and Unit #2 both include the conditions for allowing removal.

[0111] For the conditions allowing removal of the extraction steam heat storage control button for Unit #1, if the following conditions are all met, the extraction steam heat storage control button for Unit #1 can be removed: the main steam extraction control button for Unit #1 has been removed; the hot reheat extraction control button for Unit #1 has been removed;

[0112] For the conditions allowing removal of the extraction steam heat storage control button for Unit #2, if the following conditions are all met, the extraction steam heat storage control button for Unit #2 can be put into operation: the main steam extraction control button for Unit #2 has been removed; the hot reheat extraction control button for Unit #2 has been removed;

[0113] Regarding the control of the main steam extraction for Unit #1, specifically, a main steam extraction control button for Unit #1 is set, and it includes the control for allowing the input of the main steam extraction control button for Unit #1, the control for allowing the removal of the main steam extraction control button for Unit #1, and the automatic removal control of the main steam extraction control button for Unit #1 (the control of the main steam extraction for Unit #2 is similar and will not be repeated).

[0114] For the control allowing the input of the main steam extraction control button for Unit #1, if the following conditions are all met, the main steam extraction control button for Unit #1 can be put into operation: the extraction steam heat storage control button for Unit #1 is in operation; the hot reheat extraction control button for Unit #1 is in operation;

[0115] For the control allowing the removal of the main steam extraction control button for Unit #1, if the following conditions are all met, the main steam extraction control button for Unit #1 can be removed: the inlet steam flow of the main steam superheater heat exchanger < the first preset flow rate; the opening degree of the inlet regulating valve of the main steam superheater heat exchanger is less than the first preset opening degree

[0116] For the automatic removal control of the main steam extraction control button for Unit #1, if any of the following conditions is met, the main steam extraction control button for Unit #1 will be automatically removed: MFT of the boiler for Unit #1, with a 5-minute delay; turbine trip of Unit #1, with a 5-minute delay; generator disconnection of Unit #1, with a 5-minute delay

[0117] The control of the main steam extraction for Unit #1 also includes: when the main steam extraction control button for Unit #1 is in the input state, the following valves are only allowed to open; the main steam extraction isolation valve 7 for Unit #1; the isolation valve 13 for the main steam extraction to the cold reheat of Unit #1; the molten salt inlet isolation valve 19 of the main steam superheater heat exchanger; the molten salt inlet regulating valve 20 of the main steam superheater heat exchanger; the molten salt outlet isolation valve 21 of the main steam superheater heat exchanger.

[0118] The control of the main steam extraction of Unit #1 also includes: when the main steam extraction control button of Unit #1 is in the enabled state, the following valves are not allowed to be closed; the main steam extraction isolation valve 7 of Unit #1; the isolation valve 13 from the main steam extraction to the cold reheat of Unit #1; the molten salt inlet isolation valve 19 of the main steam superheater; the molten salt outlet isolation valve 21 of the main steam superheater.

[0119] The control of the hot reheat extraction of Unit #1 is specifically as follows: a hot reheat extraction control button of Unit #1 is set; and it includes the enabled control of the hot reheat extraction button of Unit #1, the disabled control of the hot reheat extraction button of Unit #1, and the automatic disabled control of the hot reheat extraction button of Unit #1 (the control of the hot reheat extraction of Unit #2 is similar and will not be repeated).

[0120] For the enabled control of the hot reheat extraction button of Unit #1, if the following conditions are met, the hot reheat extraction control button of Unit #1 can be enabled: the extraction heat storage control button of Unit #1 has been enabled.

[0121] For the disabled control of the hot reheat extraction button of Unit #1, if the following conditions are all met, the hot reheat extraction control button of Unit #1 can be disabled: the inlet steam flow of the hot reheat superheater < the second preset flow rate; the opening of the inlet regulating valve of the hot reheat superheater < the second preset opening.

[0122] For the automatic disabled control of the hot reheat extraction button of Unit #1, if any of the following conditions is met, the hot reheat extraction control button of Unit #1 is automatically disabled: the steam turbine of Unit #1 trips, with a delay of 5 minutes; the generator of Unit #1 is disconnected from the grid, with a delay of 5 minutes; the boiler MFT of Unit #1, with a delay of 5 minutes.

[0123] The control of the hot reheat extraction also includes: when the hot reheat extraction control button of Unit #1 is in the enabled state, the following valves are allowed to be opened; the hot reheat extraction isolation valve of Unit #1; the molten salt inlet isolation valve of the hot reheat superheater; the molten salt inlet regulating valve of the hot reheat superheater; the molten salt outlet isolation valve of the hot reheat superheater.

[0124] The control of the hot reheat extraction also includes: when the hot reheat extraction control button of Unit #1 is in the enabled state, the following valves are not allowed to be closed; the hot reheat extraction isolation valve of Unit #1; the molten salt inlet isolation valve of the hot reheat superheater; the molten salt outlet isolation valve of the hot reheat superheater.

[0125] The control of the hot reheat steam extraction of Unit #1 also includes the protective shutdown control of the hot reheat steam extraction (similar for Unit #2). The protective control of the hot reheat steam extraction is divided into two types: fast protection and slow protection shutdown control; when any of the fast protection conditions of the hot reheat steam extraction is triggered, the steam inlet regulating valve of the hot reheat superheater will close the steam inlet regulating valve of the hot reheat superheater at the first closing rate, and at the same time close the hot reheat steam extraction isolation valve of Unit #1, close the isolation valve of the hot reheat steam extraction to the cold reheat of Unit #1, close the molten salt inlet isolation valve of the hot reheat superheater, close the molten salt inlet regulating valve of the hot reheat superheater, and close the molten salt outlet isolation valve of the hot reheat superheater.

[0126] The quick protection conditions for the hot reheat steam extraction of Unit #1 are as follows: The input status of the hot reheat steam extraction control button of Unit #1 and the turbine trip of Unit #1; The input status of the hot reheat steam extraction control button of Unit #1 and the MFT of Unit #1's boiler; The input status of the hot reheat steam extraction control button of Unit #1 and the overspeed protection control action of Unit #1 (opc - overspeed protection control, OPC); The input status of the hot reheat steam extraction control button of Unit #1 and the signal of the extraction heat storage accident cut - off button of Unit #1, 3S pulse; The input status of the hot reheat steam extraction control button of Unit #1 and all cold salt pumps are stopped, with a delay of 30 seconds and a pulse of 3 seconds; The input status of the hot reheat steam extraction control button of Unit #1 and the high - pressure exhaust temperature of Unit #1's steam turbine > the first preset high - pressure exhaust temperature value, with a delay of 3s; The input status of the hot reheat steam extraction control button of Unit #1, the input status of the main steam extraction control button of Unit #1, and the trigger signal for the quick protection closing condition of the steam inlet regulating valve of the main steam superheater heat exchanger; The hot reheat steam extraction control button of Unit #1 is in the on state and the closing signal of the hot reheat steam extraction isolation valve's shut - off valve comes in, with a pulse of 5S: The input status of the hot reheat steam extraction control button of Unit #1 and (the hot reheat superheater molten salt inlet isolation valve is closed or the hot reheat superheater molten salt outlet isolation valve is closed), with a pulse of 5S. The input status of the hot reheat steam extraction control button of Unit #1 and the steam temperature after the hot reheat steam desuperheater > the first preset steam temperature after the hot reheat steam desuperheater; The input status of the hot reheat steam extraction control button of Unit #1 and the pressure difference between the first - stage extraction pressure and the high - pressure exhaust pressure of Unit #1 > the first preset pressure difference value; The input status of the hot reheat steam extraction control button of Unit #1 and the pressure after the hot reheat steam pressure reducing valve > the first preset pressure after the hot reheat steam pressure reducing valve; The input status of the hot reheat steam extraction control button of Unit #1 and the molten salt outlet temperature of the hot reheat superheater > the first preset molten salt outlet temperature of the hot reheat superheater; The input status of the hot reheat steam extraction control button of Unit #1 and the difference between the main steam extraction steam flow and the hot reheat steam extraction steam flow is greater than 60T / H and the temperature of the positive thrust bearing is greater than 80°C; The input status of the hot reheat steam extraction control button of Unit #1 and the difference between the hot reheat steam extraction steam flow and the main steam extraction steam flow is greater than 150T / H and the temperature of the negative thrust bearing is greater than 80°C; The slow - speed protection control of the hot reheat steam extraction of Unit #1. When the slow - speed protection condition of the hot reheat steam extraction is triggered, the steam inlet regulating valve of the hot reheat superheater will close the steam inlet regulating valve of the hot reheat superheater at the second closing rate, and at the same time, close the molten salt inlet regulating valve of the hot reheat superheater.

[0127] The slow - speed protection conditions for the hot reheat steam extraction include runback (RB) of the unit's auxiliary equipment.

[0128] The protection shutdown control of the main steam extraction of Unit 1 includes the fast protection shutdown control of the main steam extraction. Specifically, when any of the fast protection shutdown conditions of the main steam extraction is triggered, the steam inlet regulating valve of the main steam superheater heat exchanger will close the steam inlet regulating valve of the reheat superheater heat exchanger at the third closing rate. At the same time, the main steam extraction isolation valve of Unit 1 will be closed, the isolation valve of the main steam extraction to the cold reheat of Unit 1 will be closed, the molten salt inlet isolation valve of the main steam superheater heat exchanger will be closed, the molten salt inlet regulating valve of the main steam superheater heat exchanger will be closed, and the molten salt outlet isolation valve of the main steam superheater heat exchanger will be closed.

[0129] The fast protection shutdown conditions of the main steam extraction of Unit 1 are as follows: the main steam extraction heat storage input button of Unit 1 and the turbine trip of Unit 1; the main steam extraction heat storage input button of Unit 1 and the boiler MFT of Unit 1; the main steam extraction heat storage input button of Unit 1 and the OPC action of Unit 1; the main steam extraction heat storage input button of Unit 1 and all cold salt pumps are out of service, with a time delay of 30 seconds and a pulse of 3 seconds; the main steam extraction heat storage input button of Unit 1 and the high pressure exhaust temperature of Unit 1 > 380 °C; the main steam extraction heat storage input button of Unit 1 and the liquid level of the main steam condensation subcooler > 1000 mm, with a time delay of 5S; the main steam extraction heat storage input button of Unit 1 and the main steam extraction heat storage input button of the reheat extraction and the fast closing condition of the reheat liquid-actuated desuperheating and pressure reducing valve; the main steam extraction control button of Unit 1 is put into operation and the closing signal of the main steam extraction isolation valve shut-off valve of Unit 1 comes, with a pulse of 5S; the main steam extraction control button of Unit 1 is in the input state and (the molten salt inlet isolation valve of the main steam superheater heat exchanger of Unit 1 is closed or the molten salt outlet isolation valve of the main steam superheater heat exchanger is closed), with a pulse of 5S; the main steam extraction control button of Unit 1 is in the input state and the pressure difference between the first stage extraction pressure and the high pressure exhaust pressure of Unit 1 > the first preset pressure difference value; the main steam extraction control button of Unit 1 is in the input state and the pressure after the main steam extraction pressure reducing valve > the first preset pressure after the reheat extraction pressure reducing valve; the main steam extraction control button of Unit 1 is in the input state and the molten salt outlet temperature of the main steam superheater heat exchanger > the first preset molten salt outlet temperature of the reheat superheater heat exchanger; the main steam extraction control button of Unit 1 is in the input state and the difference between the main steam extraction steam flow and the reheat extraction steam flow is greater than 60 T / H and the temperature of the positive thrust bearing pad > 80 °C; the main steam extraction control button of Unit 1 is in the input state and the difference between the reheat extraction steam flow and the main steam extraction steam flow is greater than 150 T / H and the temperature of the negative thrust bearing pad > 80 °C.

[0130] The control of the main steam extraction of Unit 1 includes the slow protection shutdown control of the main steam extraction. When the slow protection condition of the main steam extraction is triggered, the steam inlet regulating valve of the main steam superheater heat exchanger will be closed at the fourth closing rate. At the same time, the molten salt inlet regulating valve of the main steam superheater heat exchanger will be closed.

[0131] The slow protection shutdown conditions of the main steam extraction of Unit 1 are as follows: Unit RB.

[0132] The hot reheat steam extraction control of Unit 1 also includes the coordinated control valve parameter adjustment control (Unit 2 is similar). The coordinated control valve parameter adjustment control includes the protection opening control of the coordinated control valve; specifically:

[0133] When the fast protection closing condition of the hot reheat steam extraction is triggered, the coordinated control valve returns to the valve opening corresponding to the comprehensive valve position at the first opening rate;

[0134] When the slow protection closing condition of the hot reheat steam extraction is triggered, the coordinated control valve returns to the valve opening corresponding to the comprehensive valve position at the second opening rate;

[0135] The coordinated control valve parameter adjustment control also includes the locking closing control of the coordinated control valve; when any of the following conditions is triggered, the opening of the coordinated control valve is locked and reduced:

[0136] (1) The hot reheat steam extraction control button of Unit 1 is put into operation AND the opening of the coordinated control valve < the first preset minimum opening of the coordinated control valve;

[0137] (2) The hot reheat steam extraction control button of Unit 1 is put into operation AND the differential pressure before and after the coordinated control valve > the first preset maximum pressure difference value;

[0138] (3) The hot reheat steam extraction control button of Unit 1 is put into operation AND the high pressure cylinder exhaust temperature ≥ the first preset high pressure cylinder exhaust temperature;

[0139] (4) The hot reheat steam extraction control button of Unit 1 is put into operation AND the opening of the governing valve of the auxiliary turbine > the first preset maximum opening of the governing valve of the auxiliary turbine;

[0140] (5) The hot reheat steam extraction control button of Unit 1 is put into operation AND the inlet steam pressure of the low pressure cylinder < the first preset minimum inlet steam pressure of the low pressure cylinder;

[0141] (6) The hot reheat steam extraction control button of Unit 1 is put into operation AND the hot reheat pressure > the first preset maximum hot reheat pressure.

[0142] It should be noted that the protection closing control of the valve has a higher priority than the closing permission control of the valve, that is, when the protection condition of the valve is triggered, the valve can still be closed even if there is no closing permission condition for the valve.

[0143] In addition, the above safety control logic can be built based on the distributed control system (DCS).

[0144] Based on the same inventive concept, the embodiments of the present application further provide a control device for a dual-machine extraction heating molten salt thermal energy storage system, which can be used to implement the methods described in the above embodiments, as in the following embodiments. Since the principle of the control device for the dual-machine extraction heating molten salt thermal energy storage system to solve problems is similar to that of the control method for the dual-machine extraction heating molten salt thermal energy storage system, the implementation of the control device for the dual-machine extraction heating molten salt thermal energy storage system can refer to the implementation of the control method for the dual-machine extraction heating molten salt thermal energy storage system, and the repeated parts will not be described again. As used hereinafter, the term "unit" or "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the systems described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0145] An embodiment of the present invention provides a specific implementation manner of a control device for a dual-machine extraction heating molten salt thermal energy storage system that can implement the control method of the dual-machine extraction heating molten salt thermal energy storage system. Refer to Figure 10 , the dual-machine extraction heating molten salt thermal energy storage system includes: two generator sets and a set of molten salt thermal energy storage systems, and the control device includes:

[0146] The first unit heat extraction module A is used to, when a first preset condition is satisfied, the heating steam sources of the main steam superheater and the reheat steam superheater of the molten salt thermal energy storage system are taken from the first generator set; the first preset condition includes: the power generation power of the first generator set is greater than a first preset power, the extraction thermal energy storage control of the second generator set is in a cut-off state, the main steam extraction isolation valve is in a closed state, the reheat steam extraction isolation valve is in a closed state, and the cold reheat isolation valve is in a closed state;

[0147] The second unit heat extraction module B is used to, when a second preset condition is satisfied, the heating steam sources of the main steam superheater and the reheat steam superheater of the molten salt thermal energy storage system are taken from the second generator set; the second preset condition includes: the power generation power of the second generator set is greater than a second preset power, and the extraction thermal energy storage control of the first generator set is in a cut-off state.

[0148] In some embodiments of the present invention, the main steam extraction isolation valve of the first generator set is arranged on the pipeline connecting the pipeline between the boiler of the first generator set and the high-pressure cylinder of the first generator set and the main steam superheater; the reheat steam extraction isolation valve of the first generator set is arranged on the pipeline connecting the pipeline between the boiler of the first generator set and the intermediate-pressure cylinder of the first generator set and the reheat superheater;

[0149] The main steam extraction isolation valve of the second generating unit is arranged on the pipeline connecting the pipeline between the boiler of the second generating unit and the high-pressure cylinder of the second generating unit and the main steam superheater heat exchanger; the hot reheat extraction isolation valve of the second generating unit is placed on the pipeline connecting the pipeline between the boiler of the second generating unit and the intermediate-pressure cylinder of the second generating unit and the reheater superheater heat exchanger.

[0150] In some embodiments of the present invention, a control device for a dual-unit extraction heating molten salt energy storage system, see Figure 11 , further includes:

[0151] The main steam extraction control input module 30 of the first unit is used to input the main steam extraction control of the first generating unit when the third preset condition is met; the third preset condition includes: the extraction energy storage control and the re-extraction control of the first generating unit are in the input state;

[0152] The main steam extraction control input module 40 of the second unit is used to input the main steam extraction control of the second generating unit when the fourth preset condition is met; the fourth preset condition includes: the extraction energy storage control and the re-extraction control of the second generating unit are in the input state.

[0153] In some embodiments of the present invention, see Figure 12 , a control device for a dual-unit extraction heating molten salt energy storage system, further includes:

[0154] The main steam extraction control cut-off module 50 of the first unit is used to cut off the main steam extraction control of the first generating unit when the fifth preset condition is met; the fifth preset condition includes at least one of the following: the main fuel trip, turbine trip, and generator disconnection of the boiler of the first generating unit;

[0155] The main steam extraction control cut-off module 60 of the second unit is used to cut off the main steam extraction control of the second generating unit when the sixth preset condition is met; the sixth preset condition includes at least one of the following: the main fuel trip, turbine trip, and generator disconnection of the boiler of the second generating unit.

[0156] In some embodiments of the present invention, the fifth preset condition further includes:

[0157] The inlet steam flow rate of the main steam superheater heat exchanger is less than the first preset flow rate, or the opening of the inlet regulating valve of the main steam superheater heat exchanger is less than the first preset opening;

[0158] The sixth preset condition further includes:

[0159] The inlet steam flow rate of the main steam superheater heat exchanger is less than the second preset flow rate, or the opening of the inlet regulating valve of the main steam superheater heat exchanger is less than the second preset opening.

[0160] In some embodiments of the present invention, referring to Figure 13 , a control device for a dual-unit extraction heating molten salt thermal energy storage system further includes:

[0161] A first unit valve opening permission module 70, configured to, when the main steam extraction control of the first generating unit is in an input state, enable the opening of the main steam extraction isolation valve of the first generating unit and the molten salt inlet regulating valve of the main steam superheater; and

[0162] For the main steam extraction isolation valve, cold reheat isolation valve, molten salt inlet isolation valve, and molten salt outlet isolation valve of the main steam superheater of the first generating unit to remain open;

[0163] A second unit valve opening permission module 80, configured to, when the main steam extraction control of the second generating unit is in an input state, enable the opening of the main steam extraction isolation valve of the second generating unit and the molten salt inlet regulating valve of the main steam superheater; and

[0164] For the main steam extraction isolation valve, cold reheat isolation valve, molten salt inlet isolation valve, and molten salt outlet isolation valve of the main steam superheater of the second generating unit to remain open.

[0165] In some embodiments of the present invention, the cold reheat isolation valve of the first generating unit is arranged on the pipeline connecting the pipeline between the boiler of the first generating unit and the high-pressure cylinder of the first generating unit and the main steam superheater;

[0166] The cold reheat isolation valve of the second generating unit is arranged on the pipeline connecting the pipeline between the boiler of the second generating unit and the high-pressure cylinder of the second generating unit and the main steam superheater.

[0167] As can be seen from the above description, a control device for a dual-machine extraction heating molten salt thermal energy storage system provided by an embodiment of the present invention includes: a first unit heat extraction module, configured to, when a first preset condition is satisfied, obtain the heating steam sources of the main steam superheater and the hot reheat superheater of the molten salt thermal energy storage system from a first generating unit; the first preset condition includes: the power generation power of the first generating unit is greater than a first preset power, the extraction thermal energy storage control of the second generating unit is in a cut-off state, the main steam extraction isolation valve is in a closed state, the hot reheat extraction isolation valve is in a closed state, and the cold reheat isolation valve is in a closed state; a second unit heat extraction module, configured to, when a second preset condition is satisfied, obtain the heating steam sources of the main steam superheater and the hot reheat superheater of the molten salt thermal energy storage system from a second generating unit; the second preset condition includes: the power generation power of the second generating unit is greater than a second preset power, the extraction thermal energy storage control of the first generating unit is in a cut-off state, the main steam extraction isolation valve is in a closed state, the hot reheat extraction isolation valve is in a closed state, and the cold reheat isolation valve is in a closed state.

[0168] In summary, the present invention provides a safety control interlock logic for a dual-machine extraction heating molten salt thermal energy storage system, which greatly reduces the error rate of manual operations by operators, enhances the safety and reliability in the state of dual-unit extraction thermal energy storage, and ensures the safety of equipment.

[0169] An embodiment of the present application further provides a specific implementation manner of an electronic device capable of implementing all steps in the control method of the dual-machine extraction heating molten salt thermal energy storage system in the above embodiment. Refer to Figure 14 , and the electronic device specifically includes the following contents:

[0170] A processor 1201, a memory 1202, a communication interface 1203, and a bus 1204;

[0171] Among them, the processor 1201, the memory 1202, and the communication interface 1203 complete mutual communication through the bus 1204; the communication interface 1203 is used to implement information transmission between related devices such as a server-side device, a power measurement device, and a user-side device.

[0172] The processor 1201 is configured to call a computer program in the memory 1202. When the processor executes the computer program, all steps in the control method of the dual-machine extraction heating molten salt thermal energy storage system in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0173] Step 100: When the first preset condition is satisfied, the heating steam sources of the main steam superheater and the reheat steam superheater of the molten salt thermal energy storage system are taken from the first generating unit; the first preset condition includes: the power generation power of the first generating unit is greater than the first preset power, the extraction steam thermal energy storage control of the second generating unit is in the cut-off state, the main steam extraction isolation valve is in the closed state, the reheat steam extraction isolation valve is in the closed state, and the cold reheat isolation valve is in the closed state;

[0174] Step 200: When the second preset condition is satisfied, the heating steam sources of the main steam superheater and the reheat steam superheater of the molten salt thermal energy storage system are taken from the second generating unit; the second preset condition includes: the power generation power of the second generating unit is greater than the second preset power, the extraction steam thermal energy storage control of the first generating unit is in the cut-off state, the main steam extraction isolation valve is in the closed state, the reheat steam extraction isolation valve is in the closed state, and the cold reheat isolation valve is in the closed state.

[0175] An embodiment of the present application also provides a computer-readable storage medium capable of implementing all steps in the control method of the dual-unit extraction steam heating molten salt thermal energy storage system in the above embodiment. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, all steps of the control method of the dual-unit extraction steam heating molten salt thermal energy storage system in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0176] Step 100: When the first preset condition is satisfied, the heating steam sources of the main steam superheater and the reheat steam superheater of the molten salt thermal energy storage system are taken from the first generating unit; the first preset condition includes: the power generation power of the first generating unit is greater than the first preset power, the extraction steam thermal energy storage control of the second generating unit is in the cut-off state, the main steam extraction isolation valve is in the closed state, the reheat steam extraction isolation valve is in the closed state, and the cold reheat isolation valve is in the closed state;

[0177] Step 200: When the second preset condition is satisfied, the heating steam sources of the main steam superheater and the reheat steam superheater of the molten salt thermal energy storage system are taken from the second generating unit; the second preset condition includes: the power generation power of the second generating unit is greater than the second preset power, the extraction steam thermal energy storage control of the first generating unit is in the cut-off state, the main steam extraction isolation valve is in the closed state, the reheat steam extraction isolation valve is in the closed state, and the cold reheat isolation valve is in the closed state.

[0178] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the hardware + program type embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments.

[0179] The above describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve the desired results. Additionally, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0180] Although this application provides method operation steps such as in the embodiments or flowcharts, it may include more or fewer operation steps based on routine or non-creative labor. The order of steps listed in the embodiments is only one way among many orders of step execution and does not represent the only execution order. When the actual device or client product is executing, it can be executed in the order of the method shown in the embodiments or figures or in parallel (e.g., in an environment of parallel processors or multithreaded processing).

[0181] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0182] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that implements the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0183] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0184] In the present invention, specific embodiments are used to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A control method for a dual-machine steam extraction heating molten salt heat storage system, characterized in that: The dual-machine steam extraction heating molten salt heat storage system includes: two generator sets and a molten salt heat storage system, and the control method includes: When the first preset condition is met, the heating steam source of the main steam superheat heat exchanger and the hot re-superheat heat exchanger of the molten salt heat storage system is taken from the first generator set; the first preset condition includes: the power generation of the first generator set is greater than the first preset power, the steam extraction heat storage control of the second generator set is in a cut-off state, the main steam extraction isolation valve is in a closed state, the hot re-extraction isolation valve is in a closed state, and the cold re-extraction isolation valve is in a closed state; When the second preset condition is met, the heating steam source of the main steam superheat exchanger and the hot re-superheat exchanger of the molten salt heat storage system is taken from the second generator set; the second preset condition includes: the power generation power of the second generator set is greater than the second preset power, the steam extraction heat storage control of the first generator set is in the cut-off state, the main steam extraction isolation valve is in the closed state, the hot re-extraction isolation valve is in the closed state, and the cold re-isolation valve is in the closed state.

2. The control method according to claim 1, characterized in that: The main steam extraction isolation valve of the first generator set is arranged on a pipe connecting the pipe between the boiler of the first generator set and the high-pressure cylinder of the first generator set and the main steam superheat heat exchanger; the hot re-extraction isolation valve of the first generator set is arranged on a pipe connecting the pipe between the boiler of the first generator set and the medium-pressure cylinder of the first generator set and the reheat superheat heat exchanger; The main steam extraction isolation valve of the second generator set is arranged on the pipeline connecting the pipeline between the boiler of the second generator set and the high-pressure cylinder of the second generator set and the main steam superheat exchanger; the hot re-extraction isolation valve of the second generator set is placed on the pipeline connecting the pipeline between the boiler of the second generator set and the medium-pressure cylinder of the second generator set and the reheat superheat exchanger.

3. The control method according to claim 1, characterized in that: Also includes: When a third preset condition is met, main steam extraction control of the first generator set is put into operation; The third preset condition includes: the steam extraction heat storage control and the re-extraction steam control of the first generator set are in the input state; When the fourth preset condition is met, the main steam extraction control of the second generator set is put into operation; the fourth preset condition includes: the extraction heat storage control and the re-extraction control of the second generator set are in the put-in state.

4. The control method according to claim 1, characterized in that: Also includes: When a fifth preset condition is met, the main steam extraction control of the first generator set is cut off; the fifth preset condition includes at least one of the following: the main fuel tripping, the steam turbine tripping and the generator disconnection of the boiler of the first generator set; When the sixth preset condition is met, the main steam extraction control of the second generator set is cut off; the sixth preset condition includes at least one of the following: main fuel tripping, steam turbine tripping and generator disconnection of the boiler of the second generator set.

5. The control method according to claim 4, characterized in that: The fifth preset condition also includes: The inlet steam flow rate of the main steam superheat heat exchanger is less than the first preset flow rate, or the opening of the inlet steam regulating valve of the main steam superheat heat exchanger is less than the first preset opening; The sixth preset condition also includes: The inlet steam flow rate of the main steam superheat heat exchanger is less than the second preset flow rate, or the opening degree of the inlet steam regulating valve of the main steam superheat heat exchanger is less than the second preset opening degree.

6. The control method according to claim 1, characterized in that: Also includes: When the main steam extraction control of the first generator set is in the input state, the main steam extraction isolation valve of the first generator set and the molten salt inlet regulating valve of the main steam superheat heat exchanger have the permission to open; and The main steam extraction isolation valve, cold re-isolation valve, molten salt inlet isolation valve of the main steam superheat heat exchanger and molten salt outlet isolation valve of the main steam superheat heat exchanger of the first generator set are kept in an open state; When the main steam extraction control of the second generator set is in the input state, the main steam extraction isolation valve of the second generator set and the molten salt inlet regulating valve of the main steam superheat heat exchanger are allowed to be opened; and The main steam extraction isolation valve, cold re-isolation valve, molten salt inlet isolation valve of the main steam superheat heat exchanger and molten salt outlet isolation valve of the main steam superheat heat exchanger of the second generator set are kept in the open state.

7. The control method according to claim 6, characterized in that: The cold re-isolating valve of the first generator set is arranged on a pipeline connecting the pipeline between the boiler of the first generator set and the high-pressure cylinder of the first generator set and the main steam superheat heat exchanger; The cold re-isolating valve of the second generator set is arranged on a pipeline connecting a pipeline between the boiler of the second generator set and the high-pressure cylinder of the second generator set and the main steam superheat heat exchanger.

8. A control device for a dual-machine steam extraction heating molten salt heat storage system, characterized in that: The dual-machine steam extraction heating molten salt heat storage system includes: two generator sets and a molten salt heat storage system, and the control device includes: The first unit heat extraction module is used for, when a first preset condition is met, the heating steam source of the main steam superheat heat exchanger and the hot re-superheat heat exchanger of the molten salt heat storage system is taken from the first generator set; the first preset condition includes: the power generation of the first generator set is greater than the first preset power, the steam extraction heat storage control of the second generator set is in a cut-off state, the main steam extraction isolation valve is in a closed state, the hot re-extraction isolation valve is in a closed state, and the cold re-extraction isolation valve is in a closed state; The second unit heat extraction module is used for taking the heating steam source of the main steam superheat heat exchanger and the hot re-superheat heat exchanger of the molten salt heat storage system from the second generator set when the second preset condition is met; the second preset condition includes: the power generation power of the second generator set is greater than the second preset power, the extraction steam heat storage control of the first generator set is in the cut-off state, the main steam extraction isolation valve is in the closed state, the hot re-extraction isolation valve is in the closed state, and the cold re-isolation valve is in the closed state.

9. The control device according to claim 8, characterized in that: The main steam extraction isolation valve of the first generator set is arranged on a pipe connecting the pipe between the boiler of the first generator set and the high-pressure cylinder of the first generator set and the main steam superheat heat exchanger; the hot re-extraction isolation valve of the first generator set is arranged on a pipe connecting the pipe between the boiler of the first generator set and the medium-pressure cylinder of the first generator set and the reheat superheat heat exchanger; The main steam extraction isolation valve of the second generator set is arranged on the pipeline connecting the pipeline between the boiler of the second generator set and the high-pressure cylinder of the second generator set and the main steam superheat exchanger; the hot re-extraction isolation valve of the second generator set is placed on the pipeline connecting the pipeline between the boiler of the second generator set and the medium-pressure cylinder of the second generator set and the reheat superheat exchanger.

10. The control device according to claim 8, characterized in that: Also includes: A first unit main steam extraction control input module, used for inputting the main steam extraction control of the first generator set when a third preset condition is met; The third preset condition includes: the steam extraction heat storage control and the re-extraction steam control of the first generator set are in the input state; The second unit main steam extraction control input module is used to input the main steam extraction control of the second generator set when the fourth preset condition is met; the fourth preset condition includes: the extraction heat storage control and the re-extraction control of the second generator set are in the input state.

11. The control device according to claim 8, characterized in that: Also includes: The first unit main steam extraction control cut-off module is used to cut off the main steam extraction control of the first generator set when a fifth preset condition is met; the fifth preset condition includes at least one of the following: the boiler of the first generator set has a main fuel trip, a steam turbine trip, and the generator is disconnected; The main steam extraction control cut-off module of the second unit is used to cut off the main steam extraction control of the second generator set when the sixth preset condition is met; the sixth preset condition includes at least one of the following: the main fuel tripping of the boiler of the second generator set, the steam turbine tripping and the generator disconnection.

12. The control device according to claim 11, characterized in that: The fifth preset condition also includes: The inlet steam flow rate of the main steam superheat heat exchanger is less than the first preset flow rate, or the opening of the inlet steam regulating valve of the main steam superheat heat exchanger is less than the first preset opening; The sixth preset condition also includes: The inlet steam flow rate of the main steam superheat heat exchanger is less than the second preset flow rate, or the opening degree of the inlet steam regulating valve of the main steam superheat heat exchanger is less than the second preset opening degree.

13. The control device according to claim 8, characterized in that: Also includes: The first unit valve opening permission module is used for allowing the main steam extraction isolation valve of the first generator set and the molten salt inlet regulating valve of the main steam superheat heat exchanger to open when the main steam extraction control of the first generator set is in the input state; as well as The main steam extraction isolation valve, cold re-isolation valve, molten salt inlet isolation valve of the main steam superheat heat exchanger and molten salt outlet isolation valve of the main steam superheat heat exchanger for the first generator set are kept in an open state; The second unit valve opening permission module is used for allowing the main steam extraction isolation valve of the second generator set and the molten salt inlet regulating valve of the main steam superheat heat exchanger to open when the main steam extraction control of the second generator set is in the input state; as well as The main steam extraction isolation valve, cold re-isolation valve, molten salt inlet isolation valve of the main steam superheat heat exchanger and molten salt outlet isolation valve of the main steam superheat heat exchanger for the second generator set are kept open.

14. The control device according to claim 13, characterized in that: The cold re-isolating valve of the first generator set is arranged on a pipeline connecting the pipeline between the boiler of the first generator set and the high-pressure cylinder of the first generator set and the main steam superheat heat exchanger; The cold re-isolating valve of the second generator set is arranged on a pipeline connecting a pipeline between the boiler of the second generator set and the high-pressure cylinder of the second generator set and the main steam superheat heat exchanger.

15. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the control method of the dual-machine steam extraction heating molten salt heat storage system described in any one of claims 1 to 7 are implemented.

16. 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, the steps of the control method of the dual-machine steam extraction heating molten salt heat storage system according to any one of claims 1 to 7 are implemented.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the control method of the dual-machine steam extraction heating molten salt heat storage system according to any one of claims 1 to 7 are implemented.

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