Implementation method for automatic commissioning of high-pressure heater and low-pressure heater in starting process of supercritical unit

Abstract

The invention provides a method for realizing automatic commissioning of high and low pressure heaters in the starting process of a supercritical unit, and belongs to the field of automatic commissioning, and the method comprises the following steps: in a typical starting mode of the supercritical unit, determining a corresponding heating pressure according to the current working type of the supercritical unit; obtaining a first constraint condition consistent with the heating pressure intensity, and screening unit data meeting the first constraint condition from the current operation data of the supercritical unit; based on the unit data, heating parameters of corresponding heaters in the supercritical unit are determined, the heating parameters are judged based on a second constraint condition, and whether automatic loop commissioning is needed or not is determined; and if yes, checking the heater after the automatic loop commissioning result meets the commissioning stop index, and stopping commissioning if the checking result meets the preset result. According to the method, the starting process of the supercritical unit is screened, screening is conducted again based on the heater needing to work, automatic operation work can be more accurate, and energy loss is reduced.

Description

Technical Field

[0001] The invention relates to the field of automatic commissioning, and in particular to a method for realizing automatic commissioning of high and low pressure heaters during the startup of a supercritical unit. Background Art

[0002] At present, with the development of science and technology, the application of science and technology in the field of industrial production has become more extensive. The most obvious is that supercritical units are used more frequently. At the same time, during the startup process of supercritical units, the commissioning of high-pressure heaters generally adopts random startup and is manually operated by operating personnel.

[0003] However, during the commissioning process of the high-pressure booster, manual startup can easily cause pressure fluctuations in the high-pressure booster, increase the amount of operations for operators and the amount of machine operations, and may also lead to operational errors and increase energy loss.

[0004] Therefore, the present invention provides a method for automatically putting high and low pressure heaters into operation during the startup of a supercritical unit. Summary of the invention

[0005] The present invention provides a method for realizing automatic operation of high and low pressure heaters during the startup process of a supercritical unit, which is used to screen the startup process of the supercritical unit and re-screen the heaters that need to work, so as to make the automatic operation more accurate, improve the accuracy of the heaters put into operation, and reduce energy loss.

[0006] The present invention provides a method for automatically putting high and low pressure heaters into operation during the startup of a supercritical unit, comprising:

[0007] Step 1: Under the typical startup mode of the supercritical unit, determine the heating pressure corresponding to the current working type in advance according to the current working type of the supercritical unit;

[0008] Step 2: obtaining a first constraint condition consistent with the heating pressure, and selecting unit data satisfying the first constraint condition from the current operating data of the supercritical unit;

[0009] Step 3: Based on the unit data, determine the heaters that need to work in the supercritical unit and the heating parameters of the corresponding heaters, and judge the heating parameters based on the second constraint condition to determine whether the corresponding heaters need to be put into operation in an automatic loop;

[0010] Step 4: If the corresponding heater requires automatic circuit commissioning, then when the automatic circuit commissioning result meets the commissioning stop index, the corresponding heater is checked. If the inspection result meets the preset result, the corresponding heater is controlled to stop commissioning.

[0011] In a possible implementation, before determining the heating pressure corresponding to the current working type, it also includes: judging whether the current supercritical unit startup mode is in a typical startup mode, specifically including:

[0012] Obtaining the metal temperature of the steam turbine before the current supercritical unit is started, and making a first judgment on whether the supercritical unit is within a typical startup state temperature range based on the metal temperature of the steam turbine;

[0013] Obtaining steam parameters of the corresponding steam turbine during the startup of the current supercritical unit, and performing a second judgment on whether the steam parameters are rated values;

[0014] Determine whether the current supercritical unit startup mode is a typical startup mode based on the result of the first judgment and the result of the second judgment;

[0015] If the first judgment result and the second judgment result of the current supercritical unit are both typical states, it is determined that the current startup mode of the supercritical unit is a typical startup mode.

[0016] In a possible implementation, in a typical startup mode of a supercritical unit, a heating pressure corresponding to the current working type is determined in advance according to the current working type of the supercritical unit, including:

[0017] Step 11: Acquire the unit operating data of the current supercritical unit during the startup process, and determine the operating type of the current supercritical unit based on the unit operating data;

[0018] Step 12: Based on the current working type, determine whether the heater cylinder pressure corresponding to the working type is high pressure, low pressure or mixed pressure;

[0019] If the pressure is in a high pressure state, it is determined that the current startup mode of the supercritical unit is that the high and low pressure cylinders are simultaneously fed with steam, and the heating pressure corresponding to the operation of the supercritical unit is determined based on the current steam feeding mode;

[0020] If the pressure is in a low pressure state, it is determined that the current startup mode of the supercritical unit is low-pressure cylinder steam intake, and the heating pressure corresponding to the operation of the supercritical unit is determined based on the current steam intake mode;

[0021] Otherwise, it is determined that the current startup mode of the supercritical unit is to use the high-pressure cylinder as the main and the low-pressure cylinder as the auxiliary for steam intake, and the steam intake ratio of the high- and low-pressure cylinders is determined based on the steam parameters, and the heating pressure corresponding to the operation of the supercritical unit is determined based on the current steam intake mode.

[0022] In a possible implementation, obtaining a first constraint condition consistent with the heating pressure, and selecting unit data satisfying the first constraint condition from current operating data of the supercritical unit, includes:

[0023] Step 21: determining a first constraint condition matching the current supercritical unit based on the heating pressure and the unit performance parameters of the supercritical unit;

[0024] Among them, the first constraint condition is all the critical conditions used to determine whether the unit can continue to work;

[0025] Step 22: Based on the corresponding data type of each first constraint sub-condition in the first constraint condition, obtain corresponding operation data of the supercritical unit;

[0026] Step 23: Perform data processing on each first constraint sub-condition, and fill the processed first constraint sub-condition into the same constraint graph to obtain a first constraint graph;

[0027] Processing the corresponding operation data, and filling the processed operation data into the same constraint graph to obtain a second constraint graph;

[0028] Acquire performance constraints of the supercritical unit based on corresponding performance under the current working type, and filter performance constraints of the part that overlaps with the corresponding data type in the first constraint condition based on the performance constraints, thereby obtaining the first performance constraints, and obtain a third constraint graph based on the first performance constraints;

[0029] Step 24: Connect all points in the first constraint graph, the second constraint graph, and the third constraint graph to obtain corresponding first constraint line graphs, second constraint line graphs, and third constraint line graphs, respectively, wherein the horizontal coordinates of the first constraint line graph, the second constraint line graph, and the third constraint line graph are all data types, and the corresponding order of the data types is consistent;

[0030] Step 25: Merge the second constraint line graph with the first constraint line graph and the third constraint line graph respectively, and determine whether there is an intersection between the second constraint line graph and the first constraint line graph and the third constraint line graph;

[0031] If there is an intersection between the second constraint line graph and the first constraint line graph, determine whether there is a portion of the second constraint line graph larger than the first constraint line graph on the left and right sides of the intersection; if so, remove the data corresponding to the portion of the second constraint line graph larger than the first constraint line graph to obtain a first corrected line graph;

[0032] If there is an intersection between the second constraint line graph and the third constraint line graph, determine whether there is a portion of the second constraint line graph larger than the third constraint line graph on the left and right sides of the intersection; if so, remove the data corresponding to the portion of the second constraint line graph larger than the third constraint line graph to obtain a second corrected line graph;

[0033] Step 26: Merge the first corrected line graph and the second corrected line graph, determine the overlapping part, and retain it;

[0034] The retained result is the unit data that meets the first constraint condition.

[0035] In a possible implementation, based on the unit data, determining the heaters that need to be operated in the supercritical unit and the heating parameters of the corresponding heaters includes:

[0036] Step 31: classifying the unit data according to the different heaters, and determining the sub-unit data corresponding to each heater in the supercritical unit;

[0037] Step 32: Determine the number of the heater corresponding to the sub-unit data, and determine the heater position based on the heater number, and obtain the real-time parameters of the current heater, and determine the heating parameters of the current heater based on the real-time parameters combined with the corresponding machine parameters.

[0038] In a possible implementation, judging the heating parameter based on the second constraint condition to determine whether the corresponding heater needs to be automatically looped and put into operation includes:

[0039] Step 01: judging the heating parameters of each heater based on the second constraint condition;

[0040] If the heating parameter of the current heater is within the second constraint condition, it is determined that the current heater needs to be put into automatic loop operation;

[0041] Step 02: Based on the heating parameters and preset tools, simulate the operation of the heater that needs to be put into automatic loop operation to determine whether the current heater can meet the working requirements of this automatic loop operation;

[0042] Step 03: Carry out automatic loop operation on the heater that can meet the requirements of this automatic loop operation.

[0043] In one possible implementation, based on the heating parameters and the preset tool, a working simulation is performed on the heater that needs to be put into automatic loop operation to determine whether the current heater can meet the working requirements of this automatic loop operation, including:

[0044] Step 021: Obtain heating parameters of the heater that needs to be put into automatic loop operation, and input the heating parameters into the preset tool to simulate the heater operation, and add real-time influencing factors in the simulation environment to perform simulation optimization;

[0045] Step 022: Based on the simulation optimization results, determine whether the current heater can meet the requirements of this automatic loop commissioning, and determine the heater that needs to be automatically commissioned based on the judgment result.

[0046] In a possible implementation, if the corresponding heater needs to be put into operation in an automatic loop, then when the result of the automatic loop operation meets the operation stop index, the corresponding heater is checked, and if the inspection result meets the preset result, the corresponding heater is controlled to stop operation, including:

[0047] Step 41: based on the heaters that need to be put into automatic loop operation, when the automatic loop operation result meets the preset operation stop index, stop the automatic operation, and obtain the heating parameters of the heaters that are currently stopped and the corresponding loop operation parameters;

[0048] Step 42: Perform a first check on the loop operation parameters to check whether the loop operation parameters meet the preset operation parameters;

[0049] Step 43: Perform a second check on the heating parameters of the heater that meets the automatic loop operation parameters. If the heating parameters are within the preset heating parameter range, it is determined that the current heater inspection result meets the preset result, and the corresponding heater is controlled to end the automatic loop operation.

[0050] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0051] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0053] Figure 1 It is a flow chart of a method for realizing automatic operation of high and low pressure heaters during the startup of a supercritical unit in an embodiment of the present invention;

[0054] Figure 2 A flowchart of selecting unit data that meets the first constraint condition in an embodiment of the present invention;

[0055] Figure 3 A flow chart of checking a corresponding heater in an embodiment of the present invention;

[0056] Figure 4 This is a structural diagram of a supercritical unit in an embodiment of the present invention;

[0057] Figure 5This is a picture of the high-pressure heater automatic operation during the unit startup process in an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0059] Embodiment 1:

[0060] The embodiment of the present invention provides a method for automatically putting high and low pressure heaters into operation during the startup of a supercritical unit, such as Figure 1 As shown, including:

[0061] Step 1: Under the typical startup mode of the supercritical unit, determine the heating pressure corresponding to the current working type in advance according to the current working type of the supercritical unit;

[0062] Step 2: obtaining a first constraint condition consistent with the heating pressure, and selecting unit data satisfying the first constraint condition from the current operating data of the supercritical unit;

[0063] Step 3: Based on the unit data, determine the heaters that need to work in the supercritical unit and the heating parameters of the corresponding heaters, and judge the heating parameters based on the second constraint condition to determine whether the corresponding heaters need to be put into operation in an automatic loop;

[0064] Step 4: If the corresponding heater requires automatic circuit commissioning, then when the automatic circuit commissioning result meets the commissioning stop index, the corresponding heater is checked. If the inspection result meets the preset result, the corresponding heater is controlled to stop commissioning.

[0065] In this embodiment, the supercritical unit refers to a working unit composed of a boiler whose internal water pressure and temperature are greater than the critical pressure.

[0066] In this embodiment, typical startup methods include but are not limited to cold startup, warm startup, and hot startup according to the boiler state of the supercritical unit, and rated parameter startup or sliding parameter startup according to boiler parameter changes.

[0067] In this embodiment, the work types include but are not limited to cooling work, heating work, compression work and startup work.

[0068] In this embodiment, the heating pressure refers to the pressure at which the supercritical unit needs to be heated, which is determined according to the current working type of the supercritical unit and the corresponding startup method.

[0069] In this embodiment, the first constraint condition is a constraint condition on the operation of the unit determined based on the unit performance parameters of the supercritical unit and the corresponding heating pressure. For example, the first constraint condition includes upper and lower output limit constraints, ramp rate constraints, minimum continuous start / stop time constraints, restricted operating area constraints, start-stop process output curve constraints, etc.

[0070] In this embodiment, the operation data refers to the operation data acquired when the supercritical unit is currently operating, and the unit data refers to the data consisting of a portion of the operation data that meets the first constraint condition.

[0071] In this embodiment, the heating parameters refer to the working parameters of the heater that needs to work in the supercritical unit, such as gas pressure, thermal power, gas consumption, hot water flow, etc.

[0072] In this embodiment, the second constraint condition is to constrain the heating parameters of the heater that needs to work, so as to ensure that the heater can meet the current heating demand.

[0073] In this embodiment, automatic loop operation means that the equipment can realize automatic cycle operation.

[0074] In this embodiment, the preset stop index is an index value that needs to stop working, which is determined based on the actual working needs of the supercritical unit currently working.

[0075] The beneficial effect of the above technical solution is: by screening the startup process of the supercritical unit and re-screening based on the heaters that need to work, the automatic commissioning work can be made more accurate, while the accuracy of the heaters put into work is improved and energy loss is reduced.

[0076] Embodiment 2:

[0077] Based on the first embodiment, before determining the heating pressure corresponding to the current working type, it also includes: judging whether the current supercritical unit startup mode is in a typical startup mode, specifically including:

[0078] Obtaining the metal temperature of the steam turbine before the current supercritical unit is started, and making a first judgment on whether the supercritical unit is within a typical startup state temperature range based on the metal temperature of the steam turbine;

[0079] Obtaining steam parameters of the corresponding steam turbine during the startup of the current supercritical unit, and performing a second judgment on whether the steam parameters are rated values;

[0080] Determine whether the current supercritical unit startup mode is a typical startup mode based on the result of the first judgment and the result of the second judgment;

[0081] If the first judgment result and the second judgment result of the current supercritical unit are both typical states, it is determined that the current startup mode of the supercritical unit is a typical startup mode.

[0082] In this embodiment, the metal temperature refers to the metal shell temperature of the corresponding steam turbine before the supercritical unit is started.

[0083] In this embodiment, the first judgment refers to judging whether the supercritical unit is in a typical startup state temperature range by the metal temperature of the turbine, including cold start (150-180°C), warm start (180-350°C), and hot start (>350°C).

[0084] In this embodiment, the steam parameters generally refer to the initial pressure and initial temperature of the cycle. For example, the steam parameters include the steam pressure and temperature at the turbine inlet.

[0085] In this embodiment, the second judgment refers to judging whether the supercritical unit is in the typical startup state temperature range through the steam parameters of the steam turbine. For example, it can generally be divided into sliding parameters and rated parameters. When starting based on sliding parameters or rated parameters, it is a typical startup method.

[0086] In this embodiment, typical startup methods include but are not limited to cold startup, warm startup, and hot startup according to the boiler state of the supercritical unit, and rated parameter startup or sliding parameter startup according to boiler parameter changes.

[0087] In this embodiment, typical states are cold state, warm state and hot state, rated parameter start-up state and sliding parameter start-up state.

[0088] In this embodiment, the supercritical unit should also make other preparations before working: 1. Check that the control air source of each pneumatic door in the system is normal, the power supply of each electric door is normal, and the valve status is correct. 2. Confirm that the drain valves of each heater are operating normally and have been put into automatic control. 3. Confirm that each meter of the system has been put into normal operation. 4. Confirm that the nitrogen filling protection system of the heater is isolated. 5. Check the correct position of all valves on the steam side and water side of the heater according to the system valve card. 6. Confirm that the water side of each high pressure heater has been put into operation normally and the condenser vacuum is normal.

[0089] The beneficial effect of the above technical solution is: by determining the startup method of the supercritical unit, the startup process of the supercritical unit can be screened in combination with the first constraint condition, and re-screened based on the heaters that need to work, which can make the automatic commissioning work more accurate, while improving the accuracy of the heaters put into work and reducing energy loss.

[0090] Embodiment 3:

[0091] Based on Example 2, in a typical startup mode of a supercritical unit, the heating pressure corresponding to the current working type is determined in advance according to the current working type of the supercritical unit, including:

[0092] Step 11: Acquire the unit operating data of the current supercritical unit during the startup process, and determine the operating type of the current supercritical unit based on the unit operating data;

[0093] Step 12: Based on the current working type, determine whether the heater cylinder pressure corresponding to the working type is high pressure, low pressure or mixed pressure;

[0094] If the pressure is in a high pressure state, it is determined that the current startup mode of the supercritical unit is that the high and low pressure cylinders are simultaneously fed with steam, and the heating pressure corresponding to the operation of the supercritical unit is determined based on the current steam feeding mode;

[0095] If the pressure is in a low pressure state, it is determined that the current startup mode of the supercritical unit is low-pressure cylinder steam intake, and the heating pressure corresponding to the operation of the supercritical unit is determined based on the current steam intake mode;

[0096] Otherwise, it is determined that the current startup mode of the supercritical unit is to use the high-pressure cylinder as the main and the low-pressure cylinder as the auxiliary for steam intake, and the steam intake ratio of the high- and low-pressure cylinders is determined based on the steam parameters, and the heating pressure corresponding to the operation of the supercritical unit is determined based on the current steam intake mode.

[0097] In this embodiment, the unit operating data refers to the operating data generated by the supercritical unit during the unit startup and operation process.

[0098] In this embodiment, the work types include but are not limited to cooling work, heating work, compression work and startup work.

[0099] In this embodiment, the cylinder pressure refers to the cylinder pressure of the high-pressure cylinder and the low-pressure cylinder.

[0100] In this embodiment, the heating pressure refers to the pressure at which the supercritical unit needs to be heated, which is determined according to the current working type of the supercritical unit and the corresponding startup method.

[0101] The beneficial effect of the above technical solution is: by determining the heating pressure of the supercritical unit startup process, and combining the first constraint condition to screen the supercritical unit, and combining the second constraint condition to screen the heaters that need to work again, the automatic commissioning work can be made more accurate, and at the same time the accuracy of the heaters put into operation is improved.

[0102] Embodiment 4:

[0103] Based on Example 3, a first constraint condition consistent with the heating pressure is obtained, and unit data satisfying the first constraint condition is selected from the current operating data of the supercritical unit, such as Figure 2 As shown, including:

[0104] Step 21: determining a first constraint condition matching the current supercritical unit based on the heating pressure and the unit performance parameters of the supercritical unit;

[0105] Among them, the first constraint condition is all the critical conditions used to determine whether the unit can continue to work;

[0106] Step 22: Based on the corresponding data type of each first constraint sub-condition in the first constraint condition, obtain corresponding operation data of the supercritical unit;

[0107] Step 23: Perform data processing on each first constraint sub-condition, and fill the processed first constraint sub-condition into the same constraint graph to obtain a first constraint graph;

[0108] Processing the corresponding operation data, and filling the processed operation data into the same constraint graph to obtain a second constraint graph;

[0109] Acquire performance constraints of the supercritical unit based on corresponding performance under the current working type, and filter performance constraints of the part that overlaps with the corresponding data type in the first constraint condition based on the performance constraints, thereby obtaining the first performance constraints, and obtain a third constraint graph based on the first performance constraints;

[0110] Step 24: Connect all points in the first constraint graph, the second constraint graph, and the third constraint graph to obtain corresponding first constraint line graphs, second constraint line graphs, and third constraint line graphs, respectively, wherein the horizontal coordinates of the first constraint line graph, the second constraint line graph, and the third constraint line graph are all data types, and the corresponding order of the data types is consistent;

[0111] Step 25: Merge the second constraint line graph with the first constraint line graph and the third constraint line graph respectively, and determine whether there is an intersection between the second constraint line graph and the first constraint line graph and the third constraint line graph;

[0112] If there is an intersection between the second constraint line graph and the first constraint line graph, determine whether there is a portion of the second constraint line graph larger than the first constraint line graph on the left and right sides of the intersection; if so, remove the data corresponding to the portion of the second constraint line graph larger than the first constraint line graph to obtain a first corrected line graph;

[0113] If there is an intersection between the second constraint line graph and the third constraint line graph, determine whether there is a portion of the second constraint line graph larger than the third constraint line graph on the left and right sides of the intersection; if so, remove the data corresponding to the portion of the second constraint line graph larger than the third constraint line graph to obtain a second corrected line graph;

[0114] Step 26: Merge the first corrected line graph and the second corrected line graph, determine the overlapping part, and retain it;

[0115] The retained result is the unit data that meets the first constraint condition.

[0116] In this embodiment, the unit performance parameters refer to the rated performance parameters of the supercritical unit. For example, the unit performance parameters include: unit rated power, rated voltage, maximum / minimum withstand temperature, etc.

[0117] In this embodiment, the first constraint condition is a constraint condition on the operation of the unit determined based on the unit performance parameters of the supercritical unit and the corresponding heating pressure. For example, the first constraint condition includes upper and lower output limit constraints, ramp rate constraints, minimum continuous start / stop time constraints, restricted operating area constraints, start-stop process output curve constraints, etc.

[0118] In this embodiment, the first constraint condition is all critical conditions used to determine whether the unit can continue to work.

[0119] In this embodiment, the first constraint sub-condition is obtained by classifying each constraint condition in the first constraint condition.

[0120] In this embodiment, the operating data refers to the operating data corresponding to the supercritical unit when the unit is in operation.

[0121] In this embodiment, the first constraint graph is obtained by performing data processing on each first constraint sub-condition and filling the processed first constraint sub-condition into the same constraint graph; the second constraint graph is obtained by performing data processing on the corresponding operating data and filling the processed operating data into the same constraint graph; the third constraint graph is obtained by performing data processing on each first performance constraint condition and filling the processed first performance constraint condition into the same constraint graph, wherein the points in the constraint graph are all data values ​​obtained after data processing on each constraint sub-condition.

[0122] In this embodiment, data processing for each constraint sub-condition refers to standardization based on the corresponding numerical value of each sub-condition, and making the standardized numerical value at (0,100) for easy comparison with other constraint sub-conditions. For example, if one of the constraint sub-conditions is that the maximum acceptable temperature of the heater is 280 degrees Celsius, then the constraint sub-condition after standardized processing is ln280.

[0123] In this embodiment, the performance constraint condition is a constraint condition obtained by the supercritical unit based on the corresponding performance under the current working type. For example, the performance constraint condition corresponding to the cooling work and the performance constraint condition corresponding to the heating work may be different.

[0124] In this embodiment, the first performance constraint condition refers to a constraint condition in which the data type corresponding to the screening condition from among the performance constraints is consistent with the data type in the first constraint condition.

[0125] In this embodiment, the first constraint line graph, the second constraint line graph, and the third constraint line graph refer to line graphs obtained by sequentially connecting adjacent points in the first constraint graph, the second constraint graph, and the third constraint graph.

[0126] In this embodiment, the horizontal axes of the first constraint line graph, the second constraint line graph, and the third constraint line graph are all data types of each sub-constraint condition in the corresponding constraint condition, and the vertical axes are data values ​​obtained after data processing of each sub-constraint condition.

[0127] In this embodiment, the first modified line graph refers to comparing the first constraint line graph with the second constraint line graph. If there is a part in the second constraint line graph that is larger than the first constraint line graph, the corresponding part of the second constraint line graph is removed to obtain a modified line graph.

[0128] In this embodiment, the second modified line graph refers to comparing the third constraint line graph with the second constraint line graph. If there is a part in the second constraint line graph that is larger than the third constraint line graph, the corresponding part of the second constraint line graph is removed to obtain a modified line graph.

[0129] The beneficial effect of the above technical solution is: by determining the first constraint condition, the supercritical units can be screened, and then the heaters that need to work can be screened again in combination with the second constraint condition, which can make the automatic commissioning work more accurate and improve the accuracy of the heaters put into operation.

[0130] Embodiment 5:

[0131] Based on the fourth embodiment and based on the unit data, determining the heaters that need to be operated in the supercritical unit and the heating parameters of the corresponding heaters includes:

[0132] Step 31: classifying the unit data according to the different heaters, and determining the sub-unit data corresponding to each heater in the supercritical unit;

[0133] Step 32: Determine the number of the heater corresponding to the sub-unit data, and determine the heater position based on the heater number, and obtain the real-time parameters of the current heater, and determine the heating parameters of the current heater based on the real-time parameters combined with the corresponding machine parameters.

[0134] In this embodiment, the sub-unit data refers to classifying several groups of data according to different heaters to obtain the corresponding unit data of each heater, wherein one heater corresponds to one group of sub-unit data.

[0135] In this embodiment, the heater position refers to the position of the heater in the supercritical unit determined according to the heater number.

[0136] In this embodiment, the real-time parameters refer to the real-time working parameters of the heater under the current working environment. For example, the real-time parameters include gas consumption, hot water flow, etc.

[0137] In this embodiment, the heating parameters refer to the working parameters of the heater that needs to work in the supercritical unit, such as gas pressure, thermal power, gas consumption, hot water flow, etc.

[0138] The beneficial effect of the above technical solution is: by classifying the heaters and determining the heating parameters of the heaters in combination with the machine parameters and the real-time parameters, the heating work is performed, thereby improving the accuracy of the heaters put into operation and reducing energy loss.

[0139] Embodiment 6:

[0140] Based on Example 5, the heating parameters are judged based on the second constraint condition to determine whether the corresponding heater needs automatic loop operation, including:

[0141] Step 01: judging the heating parameters of each heater based on the second constraint condition;

[0142] If the heating parameter of the current heater is within the second constraint condition, it is determined that the current heater needs to be put into automatic loop operation;

[0143] Step 02: Based on the heating parameters and preset tools, simulate the operation of the heater that needs to be put into automatic loop operation to determine whether the current heater can meet the working requirements of this automatic loop operation;

[0144] Step 03: Carry out automatic loop operation on the heater that can meet the requirements of this automatic loop operation.

[0145] In this embodiment, the second constraint condition is to constrain the heating parameters of the heater that needs to work, so as to ensure that the heater can meet the current heating demand.

[0146] In this embodiment, the conditions for allowing the high-pressure heater automatic circuit to be put into operation are: 1. The water level of the high-pressure heater is less than 400mm. 2. The outlet electric door of the high-pressure heater is open. 3. The three-way electric door of the high-pressure heater is on the "high-pressure heater side". 4. There is no high-pressure heater tripping condition. 5. The unit has been connected to the grid.

[0147] In this embodiment, automatic loop operation means that the equipment can realize automatic cycle operation.

[0148] In this embodiment, the preset tool refers to a working simulator capable of performing heater working simulation.

[0149] In this embodiment, the working simulation refers to inputting the heating parameters into the working simulator, and then adjusting the working simulator to a standard working environment, so that the work of the corresponding heater can be simulated.

[0150] In this embodiment, the startup procedure of the high-pressure heating subgroup is put into operation, and the inspection and confirmation procedure is executed according to the following steps: 1. Step 1, put the normal drain regulating valve of the high-pressure heating unit into "automatic" and put the emergency drain regulating valve of the high-pressure heating unit into "automatic". Check and confirm that the following conditions are met: a) The normal drain regulating valve of the high-pressure heating unit is in "automatic". b) The emergency drain regulating valve of the high-pressure heating unit is in "automatic", and the personnel set the setting value of the emergency drain regulating valve of the high-pressure heating unit according to actual needs. 2. Step 2, issue the following instructions: open the electric gate at the outlet of the high-pressure heating unit, and cut the "high-pressure heating side" with the three-way valve at the inlet of the high-pressure heating unit. Check and confirm: the water side of the high-pressure heating unit goes to the "high-pressure heating side". 3. Step 3, check and confirm that the water side of the high-pressure heating unit goes to the high-pressure heating side (if the water side of the high-pressure heating unit goes to the bypass, proceed to step 6). 4. Step 4, issue an instruction: put the normal drain regulating valve of the high-pressure heating unit into "automatic". Check and confirm that the normal drain regulating valve of the high-pressure heating unit is in "automatic", and the water side of the high-pressure heating unit goes to the "high-pressure heating side". 5. Step 5, issue an instruction: put the A3 steam extraction electric gate circuit into operation. Check and confirm that the steam extraction electric door circuit is put into operation. After the steam extraction electric door is put into operation, the program cyclically determines the rate of change of the outlet temperature of the high-pressure heater water side. If the outlet temperature of the high-pressure heater and the temperature of the high-pressure heater steam side meet the requirement that the temperature rise rate of the outlet water temperature is ≯1.83℃ / min, the A3 high-pressure heater inlet steam extraction electric door will be automatically opened by pulse, and the opening amplitude will be 1 / 3 of the normal pulse opening amplitude. If the high-pressure heater outlet temperature rise rate exceeds the limit, wait for 5 minutes. After the waiting time is over, the program continues to cyclically determine until the A3 steam extraction electric door is fully opened. 6. Step 6, the startup procedure of the high-pressure heater subgroup ends. 7. If the high-pressure heater tripping condition occurs during the automatic commissioning of the high-pressure heater, the high-pressure heater automatic commissioning circuit will be automatically exited.

[0151] The beneficial effect of the above technical solution is that by simulating the operation of the heater in advance, the automatic commissioning can be made more accurate, while the accuracy of the heater put into operation is improved and energy loss is reduced.

[0152] Embodiment 7:

[0153] Based on Example 6, judging whether the current heater can meet the working requirements of the current automatic loop commissioning includes:

[0154] Step 021: Obtain heating parameters of the heater that needs to be put into automatic loop operation, and input the heating parameters into the preset tool to simulate the heater operation, and add real-time influencing factors in the simulation environment to perform simulation optimization;

[0155] Step 022: Based on the simulation optimization results, determine whether the current heater can meet the requirements of this automatic loop commissioning, and determine the heater that needs to be automatically commissioned based on the judgment result.

[0156] In this embodiment, the heating parameters refer to the working parameters of the heater that needs to work in the supercritical unit, such as gas pressure, thermal power, gas consumption, hot water flow, etc.

[0157] In this embodiment, the real-time influencing factors include: heat dissipation of the heater, external temperature of the heater, temperature difference between the inside and outside of the heater, heater wear, etc.

[0158] In this embodiment, simulation optimization refers to optimizing the heater simulation environment based on real-time influencing factors.

[0159] In this embodiment, there are differences in the method and steps for the high-pressure heater and the low-pressure heater when the automatic loop is put into operation. For example, the commissioning of the low-pressure heater (I) Water side input: 1. The condensate system has been put into operation and the main pipe pressure is normal. 2. Check and close all the drain valves of the low-pressure heater water side pipeline and the main body, and open the bleed valve of the low-pressure heater main body and the water side pipeline. 3. Slightly open the low-pressure heater water inlet electric valve, and slowly inject water from the #8~#5 low-pressure heater water side in turn. The pipeline bleed valve is closed after water is seen. After the water injection is completed, the start bleed valve is closed. When injecting water, check that there should be no water level on the low-pressure heater water level gauge, and the condensate flow rate should not change after the water injection is completed. 4. Fully open the low-pressure heater water inlet electric valve, open the low-pressure heater water side outlet electric valve, close the bypass electric valve, and the low-pressure heater water side. 5. Flush the low-pressure heater water side as needed until it is qualified. (II) Steam side input 1. The #8A / B~#7A / B low-pressure heater steam side is randomly put into operation during the turbine run-up. 2. When the steam side of the low-pressure heater is put into operation, the water side of the low-pressure heater should be filled, and all the vent valves and the start-up exhaust valves should be closed. 3. When the steam side of the low-pressure heater is put into operation, check that the relevant drain valves of the steam extraction pipeline have been opened, open the check valve of the low-pressure heater extraction, slightly open the electric valve of the low-pressure heater extraction for preheating, and close the vent valve on the exhaust pipeline after seeing the steam. 4. The #5 and #6 low-pressure heaters are put into operation in sequence according to #6 and #5. When steam enters, open the emergency drain valve and the continuous exhaust valve, and pay attention to the changes in the condenser vacuum. After the warm-up is completed, gradually open the low-pressure heater extraction electric valve to full open, and pay attention to controlling the change rate of the low-pressure heater outlet water temperature ≯2℃ / min. During the operation, pay attention to monitoring the shell side pressure and the operation of each drain valve. 5. When the unit load is greater than 20%, check that all the drain valves of the fifth and sixth sections of the steam extraction pipeline should be closed. 6. According to the changes in the unit load and the heater pressure, timely change the #6 low-pressure heater drain from the emergency drain to the normal drain. 7. Pay attention to the fact that when the drain water quality is not up to standard during startup, the water should be discharged to the pressurized main drain pipe. Commissioning of high-pressure heater: (I) Commissioning when the water side is cold 1. Confirm that the water level of the deaerator is normal, check and confirm that the drain valves of the water side pipelines and the main body of each high-pressure heater are closed, and the vent valves of each high-pressure heater main body and pipeline are open. Confirm that the water supply pump has been filled with water, the inlet door of the water supply pump pre-pump has been opened, and the pump outlet door has been opened. Slightly open the high-pressure heater inlet three-way valve and outlet door, and vent the water of each high-pressure heater respectively. Close each vent valve after seeing water. Pay attention to controlling the temperature change rate of the high-pressure heater outlet water ≯1.83℃ / min. 2. After filling with water, check that there should be no water level on the high-pressure heater water level gauge. 3. After the pressure on the high-pressure heater water side is balanced with the main pipe pressure, fully open the high-pressure heater inlet three-way valve and outlet door. 4. Flush the high-pressure heater as needed until it is qualified. (II) Steam side commissioning 1. Confirm that the high-pressure heater water side has been commissioned normally, the high-pressure heater water level interlock protection test is normal, and the condenser vacuum is normal. 2. When the unit load reaches 30% of the rated load, commission the high-pressure heater steam side in the order of #3, #2, and #1. 3. Check that the relevant drain valves of the steam extraction pipeline are open, open the high-pressure heater steam extraction check valve, and slightly open the high-pressure heater steam extraction electric door to preheat the high-pressure heater. Pay attention to controlling the high-pressure heater outlet water temperature change rate ≯1.83℃ / min.Use the steam side of the high-pressure heater to drain the water to the pressurized main pipe drain valve to control the water level normally. After the water quality is qualified, open the emergency drain to the condenser. 4. After the high-pressure heater enters steam, close the startup exhaust valve and open the continuous exhaust valve on the steam side. 5. After the preheating is completed, the high-pressure heater is automatically put into the loop, and the high-pressure heater steam extraction electric door is gradually opened by the automatic loop. 6. When the steam side pressure of the #3 high-pressure heater is checked to be 0.3~0.5MPa higher than the deaerator pressure, confirm that the front and rear gates of the #3 high-pressure heater normal drain regulating valve are open, and slowly close the #3 high-pressure heater emergency drain valve. Note that the #3 high-pressure heater normal drain regulating valve should operate normally. 7. When the steam side pressure of the #2 high-pressure heater is checked to be 0.2~0.3MPa higher than the steam side pressure of the #3 high-pressure heater, confirm that the front and rear gates of the #2 high-pressure heater normal drain regulating valve are open, and slowly close the #2 high-pressure heater emergency drain valve. Note that the #2 high-pressure heater normal drain regulating valve should operate normally. 8. Check that the pressure on the steam side of #1 high-pressure heater is 0.2-0.3MPa higher than that on the steam side of #2 high-pressure heater, confirm that the front and rear stop valves of the normal drain regulating valve of #1 high-pressure heater are open, and slowly close the emergency drain valve of #1 high-pressure heater. Note that the normal drain regulating valve of #1 high-pressure heater should operate normally. 9. When the steam side of the high-pressure heater is put into operation normally, close all drain valves of the relevant steam extraction pipelines. 10. During the operation of the high-pressure heater, try to keep the unit load stable, and pay attention to whether the automatic adjustment of the water level of each high-pressure heater is normal. 11. During the unit startup process, after the units are paralleled (when starting in cold state, after the initial load warm-up is completed), open the first, second, and third extraction check valves, slightly open the first, second, and third extraction electric doors, preheat the high-pressure heater, and control the drainage through the emergency drain valve (when the water quality is unqualified, release the water to the pressurized drain main pipe); pay attention to the temperature rise and water level of the high-pressure heater outlet. As the load increases, gradually open the electric door of the high-pressure heater steam inlet until it is fully open, and then adjust the water level setting value of each normal drain adjustment door to normal. (III) The operation of the high-pressure heater during the operation of the unit 1. The relevant maintenance work has been completed, the maintenance site has been cleaned, and there are no items that hinder the start-up of this system. 2. The inspection and operation before the system start-up have been completed. 3. Check and confirm that the drain valves of the high-pressure heater water side pipelines and the main body are closed, and the vent valves of the high-pressure heater main body and pipelines are opened. Slowly open the high-pressure heater water filling door, vent the water of each high-pressure heater respectively, and close each vent valve after seeing water. Pay attention to controlling the change rate of the high-pressure heater outlet water temperature ≯1.83℃ / min. After the pressure on the high-pressure heater water side is balanced with the main pipe pressure, close the water filling door, slowly open the high-pressure heater outlet door and the inlet three-way valve, and the high-pressure heater water side. When switching from the bypass to the main circuit, pay attention to the normal boiler feed water flow. 4. When opening the emergency drain manual door, pay attention to the change of condenser vacuum. 5. When the high-pressure steam heater is put into operation, the pipes should be heated fully, and the outlet water temperature rise rate of the heater should be controlled to be ≯1.83℃ / min. Other operations are the same as the normal operation of the steam heater.

[0160] The beneficial effect of the above technical solution is that by judging the working capacity of the heater, the automatic commissioning can be made more accurate, while the accuracy of the heater put into operation is improved and the energy loss is reduced.

[0161] Embodiment 8:

[0162] Based on Example 6, the corresponding heaters were checked, such as Figure 3 As shown, including:

[0163] Step 41: based on the heaters that need to be put into automatic loop operation, when the automatic loop operation result meets the preset operation stop index, stop the automatic operation, and obtain the heating parameters of the heaters that are currently stopped and the corresponding loop operation parameters;

[0164] Step 42: Perform a first check on the loop operation parameters to check whether the loop operation parameters meet the preset operation parameters;

[0165] Step 43: Perform a second check on the heating parameters of the heater that meets the automatic loop operation parameters. If the heating parameters are within the preset heating parameter range, it is determined that the current heater inspection result meets the preset result, and the corresponding heater is controlled to end the automatic loop operation.

[0166] In this embodiment, attention should also be paid to the commissioning of the heater stop automatic circuit. For example, taking the A3 heater as an example: 1. When commissioning, first commission the water side and then the steam side; when decommissioning, first stop the steam side and then the water side. 2. When the heater is put into operation, it should be put into operation in the order of steam side pressure from low to high, the water side should be filled with water, and the corresponding steam extraction pipe should be warmed up. 3. All high-pressure heaters are shut down, and the load shall not exceed the rated load. The steam side of the high-pressure heater can be decoupled separately; when non-adjacent high-pressure heaters are decoupled, the maximum load is not allowed to exceed 91% of the rated load; when adjacent high-pressure heaters are decoupled, the maximum load is not allowed to exceed 95% of the rated load. In this working condition, the main steam flow, condensate flow, regulating stage pressure and each section steam extraction pressure must not exceed the maximum allowable value. For each low-pressure heater decoupled, the load is reduced by 5%. 4. All high-pressure heaters should be shut down in order of pressure from high to low. If the water side of any high-pressure heater is shut down, all three high-pressure heaters must be decoupled. 5. When the unit is operating normally, the #7 and #8 composite low-pressure heaters can be decoupled, that is, the water side of the #7 and #8 composite low-pressure heaters can be stopped. The steam side or water side of the #5 low-pressure heater can be stopped separately. When the steam side or water side of the #6 low-pressure heater is stopped, the steam side of the #5 low-pressure heater must be stopped. 6. When the high and low pressure heaters are put into operation and stopped, the load should be kept stable as much as possible under the corresponding load. 7. Before the high and low pressure heaters are put into operation, their water level protection should be put into operation normally, the emergency drain valve should be in automatic state, and the display instruments of the high and low pressure heaters should be normal. 8. During the process of putting the high and low pressure heaters into operation and stopping, the operation of the unit must be strictly monitored, especially the changes in differential expansion, monitoring section pressure, condensate flow, condensate pump current, etc. The temperature rise and temperature drop rate of the high and low pressure heaters must be strictly controlled within the allowable range. If an abnormality is found, the operation should be stopped, the cause should be found quickly, and the abnormality should be eliminated. 9. Before the heater is stopped, check and close the drain valve from the upper level to the current level heater and the front isolation valve. 10. When the heater is shut down, gradually reduce the heater steam inlet valve until it is closed, and control the heater outlet temperature drop rate to ≯1.83℃ / min. 11. When the heater steam inlet valve is closed until the heater pressure is close to the pressure of the next-stage heater, close the drain regulating valve and the front isolation valve from this stage to the next-stage heater. 12. After the steam inlet valve is closed, close the emergency drain regulating valve and the front isolation valve according to the water level.

[0167] In this embodiment, the loop commissioning parameters refer to the commissioning parameters generated during the automatic loop commissioning process.

[0168] In this embodiment, the first check refers to checking the commissioning result based on the loop commissioning parameters.

[0169] In this embodiment, the second check is to check the real-time heating parameters of the heater that meet the first check.

[0170] In this embodiment, the following inspections, monitoring and adjustments need to be performed on the normally operating heater: 1. During operation, the water level of the heater should be monitored to ensure that it is normal, the local water level gauge indicates normal, and each water level regulating valve operates normally. 2. Monitor the steam side pressure to ensure that it is normal, the heater inlet and outlet water temperatures and drain temperature are normal, and the terminal difference is normal. 3. Regularly check that the water quality of the heater is qualified. 4. Check that the heater system has no vibration or leakage. 5. When the load changes suddenly, the water level of the heater will change and should be adjusted in time. 6. Avoid long-term operation of the heater with no water level or low water level (high water level). 7. Monitor the steam extraction temperature, pressure, feed water temperature rise, terminal difference, water level, etc. of each section of the heater, and adjust the terminal difference within a reasonable range in time to achieve economical operation. 8. During the operation of the unit, it is strictly forbidden to close the heater emergency drain manual valve.

[0171] The beneficial effect of the above technical solution is that by checking the working results of the heater, it can ensure that the automatic commissioning work is more accurate, while improving the accuracy of the heater put into operation and reducing energy loss.

[0172] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for automatically putting high and low pressure heaters into operation during the startup of a supercritical unit, characterized in that: include: Step 1: Under the typical startup mode of the supercritical unit, determine the heating pressure corresponding to the current working type according to the current working type of the supercritical unit in advance; Step 2: obtaining a first constraint condition consistent with the heating pressure, and selecting unit data satisfying the first constraint condition from the current operating data of the supercritical unit; Step 3: Based on the unit data, determine the heaters that need to work in the supercritical unit and the heating parameters of the corresponding heaters, and judge the heating parameters based on the second constraint condition to determine whether the corresponding heaters need to be put into operation in an automatic loop; Step 4: If the corresponding heater requires automatic circuit commissioning, then when the automatic circuit commissioning result meets the commissioning stop index, the corresponding heater is checked. If the inspection result meets the preset result, the corresponding heater is controlled to stop commissioning.

2. The method for automatically putting high and low pressure heaters into operation during the startup of a supercritical unit according to claim 1, characterized in that: Before determining the heating pressure corresponding to the current working type, it also includes: judging whether the current supercritical unit startup mode is in a typical startup mode, specifically including: Obtaining the metal temperature of the steam turbine before the current supercritical unit is started, and making a first judgment on whether the supercritical unit is within a typical startup state temperature range based on the metal temperature of the steam turbine; Obtaining steam parameters of the corresponding steam turbine during the startup of the current supercritical unit, and performing a second judgment on whether the steam parameters are rated values; Determine whether the current supercritical unit startup mode is a typical startup mode based on the result of the first judgment and the result of the second judgment; If the first judgment result and the second judgment result of the current supercritical unit are both typical states, it is determined that the current startup mode of the supercritical unit is a typical startup mode.

3. The method for realizing automatic operation of high and low pressure heaters during the startup of a supercritical unit according to claim 2, characterized in that: In the typical startup mode of the supercritical unit, the heating pressure corresponding to the current working type is determined in advance according to the current working type of the supercritical unit, including: Step 11: Acquire the unit operating data of the current supercritical unit during the startup process, and determine the operating type of the current supercritical unit based on the unit operating data; Step 12: Based on the current working type, determine whether the heater cylinder pressure corresponding to the working type is high pressure, low pressure or mixed pressure; If the pressure is in a high pressure state, it is determined that the current startup mode of the supercritical unit is that the high and low pressure cylinders are simultaneously fed with steam, and the heating pressure corresponding to the operation of the supercritical unit is determined based on the current steam feeding mode; If the pressure is in a low pressure state, it is determined that the current startup mode of the supercritical unit is low-pressure cylinder steam intake, and the heating pressure corresponding to the operation of the supercritical unit is determined based on the current steam intake mode; Otherwise, it is determined that the current startup mode of the supercritical unit is to use the high-pressure cylinder as the main and the low-pressure cylinder as the auxiliary for steam intake, and the steam intake ratio of the high- and low-pressure cylinders is determined based on the steam parameters, and the heating pressure corresponding to the operation of the supercritical unit is determined based on the current steam intake mode.

4. The method for automatically putting high and low pressure heaters into operation during the startup of a supercritical unit according to claim 3, characterized in that: Acquiring a first constraint condition consistent with the heating pressure, and selecting unit data satisfying the first constraint condition from current operating data of the supercritical unit, including: Step 21: determining a first constraint condition matching the current supercritical unit based on the heating pressure and the unit performance parameters of the supercritical unit; Among them, the first constraint condition is all the critical conditions used to determine whether the unit can continue to work; Step 22: Based on the corresponding data type of each first constraint sub-condition in the first constraint condition, obtain corresponding operation data of the supercritical unit; Step 23: Perform data processing on each first constraint sub-condition, and fill the processed first constraint sub-condition into the same constraint graph to obtain a first constraint graph; Processing the corresponding operation data, and filling the processed operation data into the same constraint graph to obtain a second constraint graph; Acquire performance constraints of the supercritical unit based on corresponding performance under the current working type, and filter performance constraints of the part that overlaps with the corresponding data type in the first constraint condition based on the performance constraints, thereby obtaining the first performance constraints, and obtain a third constraint graph based on the first performance constraints; Step 24: Connect all points in the first constraint graph, the second constraint graph, and the third constraint graph to obtain corresponding first constraint line graphs, second constraint line graphs, and third constraint line graphs, respectively, wherein the horizontal coordinates of the first constraint line graph, the second constraint line graph, and the third constraint line graph are all data types, and the corresponding order of the data types is consistent; Step 25: Merge the second constraint line graph with the first constraint line graph and the third constraint line graph respectively, and determine whether there is an intersection between the second constraint line graph and the first constraint line graph and the third constraint line graph; If there is an intersection between the second constraint line graph and the first constraint line graph, determine whether there is a portion of the second constraint line graph larger than the first constraint line graph on the left and right sides of the intersection; if so, remove the data corresponding to the portion of the second constraint line graph larger than the first constraint line graph to obtain a first corrected line graph; If there is an intersection between the second constraint line graph and the third constraint line graph, determine whether there is a portion of the second constraint line graph larger than the third constraint line graph on the left and right sides of the intersection; if so, remove the data corresponding to the portion of the second constraint line graph larger than the third constraint line graph to obtain a second corrected line graph; Step 26: Merge the first corrected line graph and the second corrected line graph, determine the overlapping part, and retain it; The retained result is the unit data that meets the first constraint condition.

5. The method for automatically putting high and low pressure heaters into operation during the startup of a supercritical unit according to claim 4, characterized in that: Based on the unit data, determining the heaters that need to be operated in the supercritical unit and the heating parameters of the corresponding heaters, including: Step 31: classifying the unit data according to the different heaters, and determining the sub-unit data corresponding to each heater in the supercritical unit; Step 32: Determine the number of the heater corresponding to the sub-unit data, and determine the heater position based on the heater number, and obtain the real-time parameters of the current heater, and determine the heating parameters of the current heater based on the real-time parameters combined with the corresponding machine parameters.

6. The method for realizing automatic operation of high and low pressure heaters during the startup of a supercritical unit according to claim 5, characterized in that: The heating parameters are judged based on the second constraint condition to determine whether the corresponding heater needs to be put into operation automatically, including: Step 01: judging the heating parameters of each heater based on the second constraint condition; If the heating parameter of the current heater is within the second constraint condition, it is determined that the current heater needs to be put into automatic loop operation; Step 02: Based on the heating parameters and preset tools, simulate the operation of the heater that needs to be put into automatic loop operation to determine whether the current heater can meet the working requirements of this automatic loop operation; Step 03: Carry out automatic loop operation on the heater that can meet the requirements of this automatic loop operation.

7. The method for automatically putting high and low pressure heaters into operation during the startup of a supercritical unit according to claim 6, characterized in that: Based on the heating parameters and preset tools, the heater that needs to be put into automatic loop operation is simulated to determine whether the current heater can meet the working requirements of this automatic loop operation, including: Step 021: Obtain heating parameters of the heater that needs to be put into automatic loop operation, and input the heating parameters into the preset tool to simulate the heater operation, and add real-time influencing factors in the simulation environment to perform simulation optimization; Step 022: Based on the simulation optimization results, determine whether the current heater can meet the requirements of this automatic loop commissioning, and determine the heater that needs to be automatically commissioned based on the judgment result.

8. The method for automatically putting high and low pressure heaters into operation during the startup of a supercritical unit according to claim 6, characterized in that: If the corresponding heater needs to be put into operation automatically, then when the result of the automatic loop operation meets the operation stop index, the corresponding heater is checked. If the inspection result meets the preset result, the corresponding heater is controlled to stop operation, including: Step 41: based on the heaters that need to be put into automatic loop operation, when the automatic loop operation result meets the preset operation stop index, stop the automatic operation, and obtain the heating parameters of the heaters that are currently stopped and the corresponding loop operation parameters; Step 42: Perform a first check on the loop operation parameters to check whether the loop operation parameters meet the preset operation parameters; Step 43: Perform a second check on the heating parameters of the heater that meets the automatic loop operation parameters. If the heating parameters are within the preset heating parameter range, it is determined that the current heater inspection result meets the preset result, and the corresponding heater is controlled to end the automatic loop operation.

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