A method and device for automatically identifying boiler inertia time and boiler heat storage time

Abstract

The present invention discloses a method and device for automatically identifying boiler inertia time and boiler heat storage time. The method comprises: obtaining operating parameters of a thermal power unit and real-time values ​​of main steam pressure; bringing the initial values ​​of the boiler inertia time and boiler heat storage time, the operating parameters of the thermal power unit, and the real-time value of the main steam pressure into a pre-built main steam pressure module to obtain a real-time analog value of the main steam pressure; obtaining the change of the real-time value and the real-time analog value of the main steam pressure within the same time period and the change time under the same trend; judging whether the difference between the change and the change time is within a threshold range, and if so, outputting the initial values ​​of the boiler inertia time and the boiler heat storage time; if not, adjusting the initial values ​​of the boiler inertia time and the boiler heat storage time, and bringing the adjusted initial values ​​into the above steps for iteration. The present invention can adaptively modify the two parameters according to actual conditions to maintain their accuracy.

Description

Technical Field

[0001] The present invention relates to a method and a device for automatically identifying boiler inertia time and boiler heat storage time, and belongs to the technical field of power systems. Background Art

[0002] In building a new power system dominated by renewable energy, thermal power units will bear the responsibility of stabilizing grid loads and ensuring power supply, posing a significant challenge to their stable, safe, and robust operation. Coordinated optimization control can improve the safety and stability of unit operation and enhance its deep peak-shaving capabilities, which is crucial for accommodating renewable energy. However, existing coordinated optimization control systems are difficult and time-consuming to commission on-site, hindering their rapid deployment. There is an urgent need to automatically identify key coordinated optimization parameters, reduce the difficulty and time required for on-site commissioning, and enhance the adaptive capabilities of coordinated optimization control.

[0003] Boiler inertia time and boiler heat storage time are two very important parameters. The boiler inertia time represents the time from the start of the boiler fuel quantity change to the generation of new steam. When the fuel quantity remains unchanged and the turbine high-pressure throttle valve is opened wide, the main steam pressure will change according to first-order inertia. This first-order inertia time is the boiler heat storage time. Only by accurately determining these two parameters can the coordinated control of a thermal power plant achieve smooth and efficient operation. Currently, experienced engineers mainly conduct load change tests in thermal power plants to debug and confirm these two parameters. However, this debugging method has the following main shortcomings:

[0004] 1. Uncontrollable commissioning costs: With the rapid development of new energy, thermal power plants face difficulties in applying for load changes, and on-site commissioning conditions are often unavailable.

[0005] 2. Long commissioning time: Thermal power plant units have many external and internal disturbance factors. Even experienced engineers need a long time to finally confirm these two main parameters.

[0006] 3. Poor adaptability: After a thermal power plant unit has been running for a period of time, the characteristics of the unit will change, causing changes in the boiler inertia time and boiler heat storage time. When this change exceeds a certain range, the parameters confirmed during commissioning will no longer be applicable and need to be re-commissioned and confirmed. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method and device for automatically identifying boiler inertia time and boiler heat storage time, which can adaptively modify the two parameters according to the actual situation of the thermal power unit to maintain the accuracy of the two parameters.

[0008] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0009] In a first aspect, the present invention provides a method for automatically identifying boiler inertia time and boiler heat storage time, comprising:

[0010] Determine the initial values ​​of boiler inertia time and boiler heat storage time;

[0011] Obtain the real-time data of the operating parameters and main steam pressure of the thermal power unit;

[0012] The initial values ​​of boiler inertia time, boiler heat storage time, operating parameters of the thermal power unit and real-time value of main steam pressure are brought into the pre-built main steam pressure module to obtain the real-time analog value of main steam pressure;

[0013] Obtain the real-time value and the change of the real-time analog value of the main steam pressure in the same period;

[0014] Obtain the change time of the real-time value and real-time analog value of the main steam pressure under the same trend;

[0015] Determine whether the change amount and change time difference between the real-time value and the real-time analog value of the main steam pressure are within the threshold range. If so, output the initial values ​​of the boiler inertia time and the boiler heat storage time;

[0016] If not, the initial values ​​of the boiler inertia time and the boiler heat storage time are adjusted, and the adjusted initial values ​​are brought into the above steps as initial values ​​for iteration.

[0017] Optionally, the construction of the main steam pressure module includes:

[0018] Determine the operating parameters of the thermal power unit, including coal feed rate, coal calorific value, power, water feed rate, and desuperheating water rate;

[0019] Convert standard coal according to coal feeding amount and coal calorific value:

[0020]

[0021] In the formula, a and c are the calorific value and amount of coal fed, b and d are the calorific value and amount of standard coal;

[0022] Calculate the first impact factor Y1(s) of main steam according to the standard coal quantity and boiler inertia time:

[0023]

[0024] Where, T i is the boiler inertia time, U1(s)=d is the standard coal quantity, and n is the order number;

[0025] Calculate the second impact factor Y2(s) of the main steam based on the power and boiler heat storage time:

[0026]

[0027] Where, T d1 is the boiler heat storage time, U2(s) is the power;

[0028] Calculate the third impact factor Y3(s) of main steam according to the feed water rate:

[0029]

[0030] Where, T d2 is the time constant, U3(s) is the water supply;

[0031] Calculate the fourth impact factor Y4(s) of main steam based on the desuperheating water volume:

[0032]

[0033] Where, T d3 is the time constant, U4(s) is the cooling water volume;

[0034] The main steam pressure simulation model is constructed based on the main steam first influencing factor Y1(s), the main steam second influencing factor Y2(s), the main steam third influencing factor Y3(s), the main steam fourth influencing factor Y4(s) and the main steam pressure Y(s):

[0035] Y ′ (s)=Y1(s)+Y2(s)+Y3(s)+Y4(s)+Y(s)

[0036] Optionally, the initial values ​​for adjusting the boiler inertia time and the boiler heat storage time include:

[0037] When the change in the real-time analog value of the main steam pressure within the same period is greater than the change in the real-time value of the main steam pressure, the boiler inertia time is reduced according to a preset gradient;

[0038] When the change in the real-time analog value of the main steam pressure within the same period is less than the change in the real-time value of the main steam pressure, the boiler inertia time is increased according to a preset gradient;

[0039] When the change time of the real-time analog value of the main steam pressure under the same trend is greater than the change time of the real-time value of the main steam pressure, the furnace heat storage time is increased according to the preset gradient;

[0040] When the change time of the real-time analog quantity of the main steam pressure under the same trend is less than the change time of the real-time quantity of the main steam pressure, the furnace heat storage time is reduced according to the preset gradient.

[0041] In a second aspect, the present invention provides a device for automatically identifying boiler inertia time and boiler heat storage time, the device comprising:

[0042] Initialization module, used to determine the initial values ​​of boiler inertia time and boiler heat storage time;

[0043] Data acquisition module, used to obtain the real-time value of the operating parameters and main steam pressure of the thermal power unit;

[0044] The model calculation module is used to bring the initial values ​​of the boiler inertia time, the boiler heat storage time, the operating parameters of the thermal power unit, and the real-time value of the main steam pressure into the pre-built main steam pressure module to obtain the real-time simulation value of the main steam pressure;

[0045] The change acquisition module is used to obtain the real-time value and the change of the real-time analog value of the main steam pressure within the same period;

[0046] The change time acquisition module is used to obtain the change time of the real-time value and real-time analog value of the main steam pressure under the same trend;

[0047] The judgment decision module is used to determine whether the change amount and change time difference between the real-time value and the real-time analog value of the main steam pressure are within the threshold range. If so, the initial values ​​of the boiler inertia time and the boiler heat storage time are output; if not, the initial values ​​of the boiler inertia time and the boiler heat storage time are adjusted, and the adjusted initial values ​​are used as the initial values ​​to iterate in the above steps.

[0048] In a third aspect, the present invention provides an automatic identification device for boiler inertia time and boiler heat storage time, comprising a processor and a storage medium;

[0049] The storage medium is used to store instructions;

[0050] The processor is configured to operate according to the instructions to execute the steps of the above method.

[0051] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method when executed by a processor.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] The present invention provides a method and device for automatically identifying boiler inertia time and boiler heat storage time. These methods automatically collect relevant parameters of a thermal power unit during load changes, thereby calculating the changes in the real-time and real-time analog values ​​of main steam pressure over the same period, as well as the time when these changes coincide with the same trend. Through continuous correction and iteration, the boiler inertia time and boiler heat storage time are ultimately determined. This eliminates the need for thermal power plants to submit load change requests, as correction and iteration can be performed continuously. These two important parameters can be confirmed in a relatively short period of time and can be adaptively modified based on the actual conditions of the thermal power unit to maintain their accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a flow chart of a method for automatically identifying boiler inertia time and boiler heat storage time provided in Example 1 of the present invention;

[0055] Figure 2 This is a schematic diagram of the construction principle of a main steam pressure module provided in the first embodiment of the present invention;

[0056] Figure 3 This is a thermal power unit simulation program interface 1 provided by the first embodiment of the present invention;

[0057] Figure 4 This is a second interface of a thermal power unit simulation program provided by the first embodiment of the present invention;

[0058] Figure 5 This is a third interface of a thermal power unit simulation program provided in the first embodiment of the present invention. DETAILED DESCRIPTION

[0059] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0060] Example 1:

[0061] like Figure 1 As shown, an embodiment of the present invention provides a method for automatically identifying boiler inertia time and boiler heat storage time, comprising the following steps:

[0062] 1. Determine the initial values ​​of boiler inertia time and boiler heat storage time;

[0063] 2. Obtain the real-time data of the operating parameters and main steam pressure of the thermal power unit;

[0064] 3. Submit the initial values ​​of the boiler inertia time, boiler heat storage time, thermal power unit operating parameters, and real-time main steam pressure into the pre-built main steam pressure module to obtain the real-time analog value of the main steam pressure;

[0065] 4. Obtain the real-time value and the change of the real-time analog value of the main steam pressure in the same period;

[0066] 5. Obtain the change time of the real-time value and real-time analog value of the main steam pressure under the same trend;

[0067] 6. Determine whether the change amount and change time difference between the real-time value and the real-time analog value of the main steam pressure are within the threshold range.

[0068] If so, the initial values ​​of boiler inertia time and boiler heat storage time are output;

[0069] If not, the initial values ​​of the boiler inertia time and the boiler heat storage time are adjusted, and the adjusted initial values ​​are brought into the above steps as initial values ​​for iteration.

[0070] The adjustment method is:

[0071] When the change in the real-time analog value of the main steam pressure within the same period is greater than the change in the real-time value of the main steam pressure, the boiler inertia time is reduced according to a preset gradient;

[0072] When the change in the real-time analog value of the main steam pressure during the same period is less than the change in the real-time value of the main steam pressure, the boiler inertia time is increased according to a preset gradient;

[0073] When the change time of the real-time analog value of the main steam pressure is greater than the change time of the real-time value of the main steam pressure under the same trend, the furnace heat storage time is increased according to the preset gradient;

[0074] When the change time of the real-time analog value of the main steam pressure is less than the change time of the real-time value of the main steam pressure under the same trend, the furnace heat storage time is reduced according to the preset gradient.

[0075] like Figure 2 As shown, the construction of the main steam pressure module includes:

[0076] Determine the operating parameters of the thermal power unit, including coal feed rate, coal calorific value, power, water feed rate and desuperheating water rate;

[0077] Convert standard coal according to coal feeding amount and coal calorific value:

[0078]

[0079] In the formula, a and c are the calorific value and amount of coal fed, b and d are the calorific value and amount of standard coal;

[0080] Calculate the first impact factor Y1(s) of main steam according to the standard coal quantity and boiler inertia time:

[0081]

[0082] Where, T i is the boiler inertia time, U1(s)=d is the standard coal quantity, and n is the order (generally set to 3);

[0083] Calculate the second impact factor Y2(s) of the main steam based on the power and boiler heat storage time:

[0084]

[0085] Where, T d1 is the boiler heat storage time, U2(s) is the power;

[0086] Calculate the third impact factor Y3(s) of main steam according to the feed water rate:

[0087]

[0088] Where, T d2 is the time constant (usually 60-120s), U3(s) is the water supply;

[0089] Calculate the fourth impact factor Y4(s) of main steam based on the desuperheating water volume:

[0090]

[0091] Where, T d3 is the time constant (usually 30-90s), U4(s) is the cooling water volume;

[0092] The main steam pressure simulation model is constructed based on the main steam first influencing factor Y1(s), the main steam second influencing factor Y2(s), the main steam third influencing factor Y3(s), the main steam fourth influencing factor Y4(s) and the main steam pressure Y(s):

[0093] Y ′ (s)=Y1(s)+Y2(s)+Y3(s)+Y4(s)+Y(s)

[0094] like Figure 3-5 As shown, the present invention has been configured in the DCS system and successfully applied to the simulation program of the thermal power unit. In the simulation program, the load change of the actual thermal power unit is simulated. After the automatic identification program runs, after several load changes, the identification program will obtain the correct boiler inertia time and boiler heat storage time.

[0095] 1. When the unit load changes, the main steam pressure change output by the model and the actual main steam pressure change (absolute value of change and change time) are calculated and compared in real time, and the boiler inertia time and boiler heat storage time correction values ​​are given based on the calculation results.

[0096] 2. Repeat step 1 until the boiler inertia time and boiler heat storage time correction values ​​are 0. At this time, the main steam pressure change trend output by the model and the actual main steam pressure change trend basically overlap.

[0097] 3. After a period of time, if the calculated boiler inertia time and boiler heat storage time do not change, the final parameters can be obtained and the identification is completed.

[0098] Related terms explanation:

[0099] TSG: Time of steam generation boiler inertia time

[0100] TSS:Time of steam storage boiler heat storage time

[0101] DCS:distributed control system

[0102] Example 2:

[0103] An embodiment of the present invention provides an automatic identification device for boiler inertia time and boiler heat storage time, the device comprising:

[0104] Initialization module, used to determine the initial values ​​of boiler inertia time and boiler heat storage time;

[0105] Data acquisition module, used to obtain the real-time value of the operating parameters and main steam pressure of the thermal power unit;

[0106] The model calculation module is used to bring the initial values ​​of the boiler inertia time, the boiler heat storage time, the operating parameters of the thermal power unit, and the real-time value of the main steam pressure into the pre-built main steam pressure module to obtain the real-time simulation value of the main steam pressure;

[0107] The change acquisition module is used to obtain the real-time value and the change of the real-time analog value of the main steam pressure within the same period;

[0108] The change time acquisition module is used to obtain the change time of the real-time value and real-time analog value of the main steam pressure under the same trend;

[0109] The judgment decision module is used to determine whether the change amount and change time difference between the real-time value and the real-time analog value of the main steam pressure are within the threshold range. If so, the initial values ​​of the boiler inertia time and the boiler heat storage time are output; if not, the initial values ​​of the boiler inertia time and the boiler heat storage time are adjusted, and the adjusted initial values ​​are used as the initial values ​​to iterate in the above steps.

[0110] Example 3:

[0111] Based on the first embodiment, the present invention provides an automatic identification device for boiler inertia time and boiler heat storage time, including a processor and a storage medium;

[0112] The storage medium is used to store instructions;

[0113] The processor is configured to operate according to the instructions to execute the steps of the above method.

[0114] Example 4:

[0115] Based on the first embodiment, the embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the above method are implemented.

[0116] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0117] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0118] These computer program instructions may 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, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0119] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0120] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for automatically identifying boiler inertia time and boiler heat storage time, characterized in that: include: Determine the initial values ​​of boiler inertia time and boiler heat storage time; Obtain the real-time data of the operating parameters and main steam pressure of the thermal power unit; The initial values ​​of boiler inertia time, boiler heat storage time, operating parameters of the thermal power unit and real-time value of main steam pressure are brought into the pre-built main steam pressure module to obtain the real-time analog value of main steam pressure; Obtain the real-time value and the change of the real-time analog value of the main steam pressure in the same period; Obtain the change time of the real-time value and real-time analog value of the main steam pressure under the same trend; Determine whether the difference between the change amount and change time of the real-time value and the real-time analog value of the main steam pressure is within If it is within the threshold range, then the initial values ​​of the boiler inertia time and boiler heat storage time are output; If not, adjust the initial values ​​of the boiler inertia time and the boiler heat storage time, and bring the adjusted initial values ​​into the above steps as the initial values ​​for iteration; The construction of the main steam pressure module includes: Determine the operating parameters of the thermal power unit, including coal feed rate, coal calorific value, power, water feed rate, and desuperheating water rate; Convert standard coal according to coal feeding amount and coal calorific value: ; Where, is the calorific value and amount of coal fed, is the calorific value and quantity of standard coal; Calculate the first influencing factor of main steam based on standard coal quantity and boiler inertia time : ; Where, is the boiler inertia time, is the standard coal quantity, is the order; Calculate the second influencing factor of main steam based on power and boiler heat storage time : ; Where, is the boiler heat storage time, is power; Calculate the third influencing factor of main steam based on feed water volume : ; Where, is the time constant, is the water supply; Calculate the fourth influencing factor of main steam based on the amount of desuperheating water : ; Where, is the time constant, The amount of water for cooling; According to the first impact factor of main steam , the second influencing factor of main steam , the third influencing factor of main steam , the fourth influencing factor of main steam and main steam pressure Constructing a main steam pressure simulation model: 。 2. The method for automatically identifying boiler inertia time and boiler heat storage time according to claim 1, characterized in that: The initial values ​​for adjusting the boiler inertia time and the boiler heat storage time include: When the change in the real-time analog value of the main steam pressure within the same period is greater than the change in the real-time value of the main steam pressure, the boiler inertia time is reduced according to a preset gradient; When the change in the real-time analog value of the main steam pressure within the same period is less than the change in the real-time value of the main steam pressure, the boiler inertia time is increased according to a preset gradient; When the change time of the real-time analog value of the main steam pressure under the same trend is greater than the change time of the real-time value of the main steam pressure, the furnace heat storage time is increased according to the preset gradient; When the change time of the real-time analog quantity of the main steam pressure under the same trend is less than the change time of the real-time quantity of the main steam pressure, the furnace heat storage time is reduced according to the preset gradient.

3. An automatic identification device for boiler inertia time and boiler heat storage time, characterized in that: The device comprises: Initialization module, used to determine the initial values ​​of boiler inertia time and boiler heat storage time; Data acquisition module, used to obtain the real-time value of the operating parameters and main steam pressure of the thermal power unit; The model calculation module is used to bring the initial values ​​of the boiler inertia time, the boiler heat storage time, the operating parameters of the thermal power unit, and the real-time value of the main steam pressure into the pre-built main steam pressure module to obtain the real-time simulation value of the main steam pressure; The change acquisition module is used to obtain the real-time value and the change of the real-time analog value of the main steam pressure within the same period; The change time acquisition module is used to obtain the change time of the real-time value and real-time analog value of the main steam pressure under the same trend; The judgment and decision module is used to determine whether the change amount and change time difference between the real-time value and the real-time analog value of the main steam pressure are within the threshold range. If so, the initial values ​​of the boiler inertia time and the boiler heat storage time are output; if not, the initial values ​​of the boiler inertia time and the boiler heat storage time are adjusted, and the adjusted initial values ​​are used as the initial values ​​for iteration in the above steps; The construction of the main steam pressure module includes: Determine the operating parameters of the thermal power unit, including coal feed rate, coal calorific value, power, water feed rate, and desuperheating water rate; Convert standard coal according to coal feeding amount and coal calorific value: ; Where, is the calorific value and amount of coal fed, is the calorific value and quantity of standard coal; Calculate the first influencing factor of main steam based on standard coal quantity and boiler inertia time : ; Where, is the boiler inertia time, is the standard coal quantity, is the order; Calculate the second influencing factor of main steam based on power and boiler heat storage time : ; Where, is the boiler heat storage time, is power; Calculate the third influencing factor of main steam based on feed water volume : ; Where, is the time constant, is the water supply; Calculate the fourth influencing factor of main steam based on the amount of desuperheating water : ; Where, is the time constant, The amount of water for cooling; According to the first impact factor of main steam , the second influencing factor of main steam , the third influencing factor of main steam , the fourth influencing factor of main steam and main steam pressure Constructing a main steam pressure simulation model: 。 4. An automatic identification device for boiler inertia time and boiler heat storage time, characterized in that: including processor and storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to claim 1 or 2.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to claim 1 or 2 are implemented.

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