Determination of boiler heat transfer inertia, boiler heat transfer inertia control analysis method and device

Abstract

The present invention discloses a method for determining the heat transfer inertia of a boiler, a method and device for regulating and analyzing the heat transfer inertia of a boiler, and relates to the technical field of comprehensive energy optimization and scheduling, wherein the method for determining the heat transfer inertia of a boiler includes: determining the mapping relationship between the output heat of the boiler and the boiler load; determining the mapping relationship between the heat storage of the boiler and the boiler load; determining a heat transfer inertia calculation model based on the mapping relationship between the output heat of the boiler and the boiler load, and the mapping relationship between the heat storage of the boiler and the boiler load, wherein the heat transfer inertia calculation model is used to calculate the heat transfer inertia of the boiler based on the heat storage of the boiler at the initial and final states of the boiler load change, as well as the input and output heat of the boiler; and determining the heat transfer inertia of the boiler using the heat transfer inertia calculation model. The present invention can accurately characterize the heat transfer inertia of the boiler, and provide basic data for the comparison and selection of boiler variable load capacity improvement plans and the design of automatic control systems.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive energy optimization scheduling, and in particular to a method and device for determining boiler heat transfer inertia and regulating and analyzing boiler heat transfer inertia. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section.

[0003] A boiler is a device that converts the chemical energy in the fuel into the internal energy of steam. The energy transfer process is: the chemical energy of the incoming fuel is converted into the thermal energy of the flue gas / bed material; the flue gas / bed material transfers the thermal energy to the heating surface metal through refractory materials (or directly); the heating surface metal transfers the thermal energy to the working fluid; the working fluid outputs the boiler after the internal energy increases. There are many technologies for regulating the heat transfer inertia of the boiler, such as: changing the heat transfer coefficient on the flue gas / working fluid side, changing the total amount of flue gas, bed material, refractory materials or heating surface metal, and changing the thermal properties of refractory materials / heating surface metal. When one or more of these factors change, the heat transfer inertia may increase or decrease accordingly. This is the basic principle of heat transfer inertia control technology. In order to quantitatively evaluate the potential of heat transfer inertia control technology, it is necessary to estimate the maximum change in heat transfer inertia under ideal conditions.

[0004] The prior art provides a method for characterizing the heat transfer inertia of a graphite heating element of a heating system for aerospace aircraft testing. The method mainly obtains the heat transfer inertia characterization parameters of the modular graphite heating element in the temperature rise range of 30 to 2000°C by the method of "determining the size value of the modular graphite heating element → determining the voltage boundary of the modular graphite heating element → determining the heat transfer inertia characterization parameters of the modular graphite heating element"; by determining the specific calculation method of the heat transfer inertia characterization parameters of the modular graphite heating element, a theoretical support is provided for the subsequent specific design of the modular graphite heating element, so that the actual performance of the prepared modular graphite heating element can be as close to the theoretical value as possible, that is, a modular graphite heating element with better thermal response characteristics is prepared. However, the heat transfer inertia characterization parameters of the graphite heating element proposed by this method and its experimental determination method are not suitable for boiler equipment.

[0005] The prior art also provides a comprehensive energy system optimization scheduling method, including: establishing an electricity-gas-heat multi-energy coupling system model; building a natural gas system pipeline storage model; building a thermal system heat transfer inertia model; with the goal of minimizing the total operating cost, reconstructing the electricity-gas-heat multi-energy coupling system model based on the natural gas system pipeline storage model and the thermal system heat transfer inertia model, obtaining a comprehensive energy system optimization scheduling model that takes into account pipeline storage and heat transfer inertia, and using the comprehensive energy system optimization scheduling model to solve and obtain a scheduling plan. However, the heat transfer inertia model constructed by this method is not suitable for boiler equipment. Summary of the invention

[0006] The embodiment of the present invention provides a method for determining the heat transfer inertia of a boiler, which is used to accurately characterize the heat transfer inertia of the boiler and provide basic data for the comparison and selection of boiler variable load capacity improvement schemes and the design of automatic control systems. The method for determining the heat transfer inertia of a boiler includes:

[0007] Determine the mapping relationship between boiler output heat and boiler load;

[0008] Determine the mapping relationship between boiler heat storage and boiler load;

[0009] According to the mapping relationship between boiler output heat and boiler load, and the mapping relationship between boiler heat storage and boiler load, a heat transfer inertia calculation model is determined, wherein the heat transfer inertia calculation model is used to calculate the boiler heat transfer inertia according to the boiler heat storage at the initial and final states of boiler load change, and the boiler input and output heat;

[0010] The heat transfer inertia calculation model is used to determine the heat transfer inertia of the boiler.

[0011] The embodiment of the present invention further provides a boiler heat transfer inertia control analysis method using the above boiler heat transfer inertia determination method, so as to achieve quantitative evaluation of the improvement effect of boiler heat transfer inertia control technology. The boiler heat transfer inertia control analysis method includes:

[0012] Obtain the boiler heat transfer inertia before regulation determined through actual furnace tests;

[0013] Determine the influencing parameters of the control on the boiler, wherein the influencing parameters include one or more of the following parameters: boiler heat storage at the initial and final states of boiler load change, and boiler input and output heat;

[0014] Determine the combination of influencing parameters that maximizes the change in boiler heat transfer inertia before and after regulation;

[0015] According to the combination of influencing parameters, using the heat transfer inertia calculation model, determining the heat transfer inertia of the boiler after regulation;

[0016] The heat transfer inertia of the boiler after regulation is compared with the heat transfer inertia of the boiler before regulation to determine the change in the heat transfer inertia of the boiler before and after regulation;

[0017] The regulation effect is analyzed based on the change in boiler heat transfer inertia before and after regulation.

[0018] The embodiment of the present invention further provides a boiler heat transfer inertia determination device, which is used to accurately characterize the boiler heat transfer inertia and provide basic data for boiler variable load capacity improvement scheme comparison and automatic control system design. The boiler heat transfer inertia determination device includes:

[0019] A first mapping relationship determination module, used to determine a mapping relationship between boiler output heat and boiler load;

[0020] A second mapping relationship determination module is used to determine the mapping relationship between boiler heat storage and boiler load;

[0021] A heat transfer inertia calculation model determination module is used to determine a heat transfer inertia calculation model according to a mapping relationship between boiler output heat and boiler load, and a mapping relationship between boiler heat storage and boiler load, wherein the heat transfer inertia calculation model is used to calculate the boiler heat transfer inertia according to the boiler heat storage at the initial and final states of boiler load change, and the boiler input and output heat;

[0022] The heat transfer inertia determination module is used to determine the heat transfer inertia of the boiler using the heat transfer inertia calculation model.

[0023] The embodiment of the present invention further provides a boiler heat transfer inertia control and analysis device using the above-mentioned boiler heat transfer inertia determination device, so as to achieve quantitative evaluation of the improvement effect of the boiler heat transfer inertia control technology. The boiler heat transfer inertia control and analysis device includes:

[0024] A module for determining heat transfer inertia before regulation, used to obtain the heat transfer inertia of the boiler before regulation determined through actual furnace tests;

[0025] An influencing parameter determination module is used to determine the influencing parameters of the control on the boiler, wherein the influencing parameters include one or more of the following parameters: boiler heat storage at the initial and final states of boiler load change, and boiler input and output heat;

[0026] An influencing parameter combination determination module is used to determine the influencing parameter combination that maximizes the change in boiler heat transfer inertia before and after regulation among the influencing parameters;

[0027] A module for determining heat transfer inertia after regulation, used to determine the heat transfer inertia of the boiler after regulation according to the combination of influencing parameters and using the heat transfer inertia calculation model;

[0028] A heat transfer inertia change determination module is used to compare the heat transfer inertia of the boiler after regulation with the heat transfer inertia of the boiler before regulation to determine the change in the heat transfer inertia of the boiler before and after regulation;

[0029] The analysis module is used to analyze the control effect according to the change in boiler heat transfer inertia before and after control.

[0030] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned boiler heat transfer inertia determination method or boiler heat transfer inertia control and analysis method when executing the computer program.

[0031] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-mentioned boiler heat transfer inertia determination method or boiler heat transfer inertia control and analysis method.

[0032] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the method for determining the heat transfer inertia of a boiler or the method for regulating and analyzing the heat transfer inertia of a boiler is implemented.

[0033] Compared with the technical solution of building a heat transfer inertia model for a graphite heating element or a thermal system in the prior art, the embodiment of the present invention determines the mapping relationship between the boiler output heat and the boiler load; determines the mapping relationship between the boiler heat storage and the boiler load; determines the heat transfer inertia calculation model according to the mapping relationship between the boiler output heat and the boiler load, and the mapping relationship between the boiler heat storage and the boiler load; the heat transfer inertia calculation model is used to calculate the boiler heat transfer inertia according to the boiler heat storage at the initial and final states of the boiler load change, as well as the boiler input and output heat; uses the heat transfer inertia calculation model to determine the boiler heat transfer inertia, thereby achieving accurate characterization of the boiler heat transfer inertia, and providing basic data for the comparison of boiler variable load capacity improvement plans and the design of automatic control systems.

[0034] The embodiment of the present invention also obtains the heat transfer inertia of the boiler before regulation determined by actual furnace tests; determines the influencing parameters of the regulation on the boiler; determines the influencing parameter combination that maximizes the change in the heat transfer inertia of the boiler before and after regulation among the influencing parameters; determines the heat transfer inertia of the boiler after regulation using the heat transfer inertia calculation model according to the influencing parameter combination; compares the heat transfer inertia of the boiler after regulation with the heat transfer inertia of the boiler before regulation to determine the change in the heat transfer inertia of the boiler before and after regulation; and analyzes the regulation effect according to the change in the heat transfer inertia of the boiler before and after regulation, thereby achieving quantitative evaluation of the improvement effect of the boiler heat transfer inertia regulation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0036] Figure 1 It is a flow chart of a method for determining the heat transfer inertia of a boiler in an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of boiler heat transfer inertia real furnace test process in an embodiment of the present invention;

[0038] Figure 3 This is a flow chart of a boiler heat transfer inertia control analysis method according to an embodiment of the present invention;

[0039] Figure 4 It is a structural block diagram of a device for determining heat transfer inertia of a boiler in an embodiment of the present invention;

[0040] Figure 5 The structure block diagram of a boiler heat transfer inertia control and analysis device in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] Embodiments of the present invention provide a boiler heat transfer inertia determination method, a boiler heat transfer inertia control analysis method, a boiler heat transfer inertia determination device, a boiler heat transfer inertia control analysis device, a computing device, a computer-readable storage medium, and a computer program product.

[0042] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0043] The following first introduces the terms involved in the present invention.

[0044] Heat transfer inertia: refers to the time required for the boiler input heat change to complete the internal energy response of the working fluid through the heat transfer process. Heat transfer inertia can also be defined as the boiler heat capacity or temperature change rate. Heat transfer inertia is an important factor affecting the boiler load change rate. The smaller the heat transfer inertia, the faster the boiler load change rate.

[0045] As for the determination method of heat transfer inertia, the existing technologies are as follows: (1) The thermal inertia characterization method of the graphite heating element of the heating system for aerospace plane testing; through the method of "determining the size value of the modular graphite heating element → determining the voltage boundary of the modular graphite heating element → determining the thermal inertia characterization parameter of the modular graphite heating element", the thermal inertia characterization parameter of the modular graphite heating element in the temperature rise range of 30 to 2000°C is obtained; however, the thermal inertia characterization parameter of the graphite heating element proposed by this method and its experimental determination method are not suitable for boiler equipment. (2) The optimization scheduling method of the comprehensive energy system taking into account pipeline storage and thermal inertia includes the following steps: S1, building a natural gas system pipeline gas storage model; S2, building a thermal inertia model of the thermal system; S3, establishing a comprehensive energy system model taking into account pipeline storage and thermal inertia; S4, establishing a comprehensive energy system optimization scheduling model taking into account pipeline storage and thermal inertia, and establishing a day-ahead economic optimization scheduling model with the goal of minimizing the total operating cost. (3) A frequency regulation method that takes into account the flexible exit of thermal inertia of the integrated energy system. First, the slow-motion characteristics of the thermal system in the integrated energy system are deeply explored and modeled. Then, the potential of thermal inertia to respond to power shortages in the power grid is used to provide support for power grid frequency failures. At the same time, the importance of heat demand to different heat loads is considered, and thermal inertia is allowed to be flexibly exited during the frequency regulation process according to the importance of heat demand. (4) A frequency regulation method that takes into account the gas-thermal inertia of the integrated energy system. First, the slow-dynamic characteristics of the natural gas system and the thermal system are explored and modeled. Then, the potential of gas-thermal inertia in the integrated energy system to respond to power shortages in the power grid is used to provide frequency response for the power grid. Finally, the energy storage characteristics of gas inertia are used to assist in the recovery of thermal inertia output and support the secondary drop in frequency. (5) An integrated energy system optimization scheduling method, including: establishing an electricity-gas-heat multi-energy coupling system model; building a natural gas system pipeline storage model; building a thermal system thermal inertia model; step S4, with the goal of minimizing the total operating cost, reconstructing the electricity-gas-heat multi-energy coupling system model based on the natural gas system pipeline storage model and the thermal system thermal inertia model, obtaining an integrated energy system optimization scheduling model that takes pipeline storage and thermal inertia into account, and using the integrated energy system optimization scheduling model to solve and obtain a scheduling plan. The hot water network and building thermal inertia models established in (2)-(5) are also not suitable for boiler equipment, and no experimental verification method for the model and a boiler heat transfer inertia control analysis method have been established.

[0046] Technical evaluation refers to the pre-estimation of the most ideal effect that can be achieved before the implementation of technical improvement / innovation. Technical evaluation can provide a technical basis for the benefit evaluation of technical improvement / innovation, and is an important prerequisite for technical links such as improvement / innovation scheme comparison and automatic control system design. The existing technology does not propose a quantitative evaluation method for the effect of heat transfer inertia control technology suitable for boiler equipment.

[0047] In view of the shortcomings of the prior art, an embodiment of the present invention provides a method for determining the heat transfer inertia of a boiler, which is used to accurately characterize the heat transfer inertia applicable to the boiler; it also provides an experimental verification method for a boiler heat transfer inertia model and a boiler heat transfer inertia control analysis method, which are used to quantitatively evaluate the improvement effect of the boiler heat transfer inertia control technology.

[0048] Figure 1 FIG. 1 is a flow chart of a method for determining the heat transfer inertia of a boiler according to an embodiment of the present invention. Figure 1 As shown, the method for determining the heat transfer inertia of a boiler provided in an embodiment of the present invention includes:

[0049] S101, determining a mapping relationship between boiler output heat and boiler load;

[0050] S102, determining a mapping relationship between boiler heat storage and boiler load;

[0051] S103, determining a heat transfer inertia calculation model according to a mapping relationship between boiler output heat and boiler load, and a mapping relationship between boiler heat storage and boiler load, wherein the heat transfer inertia calculation model is used to calculate the boiler heat transfer inertia according to the boiler heat storage at the initial and final states of boiler load change, and the boiler input and output heat;

[0052] S104: Determine the heat transfer inertia of the boiler using the heat transfer inertia calculation model.

[0053] In one embodiment, determining the mapping relationship between boiler output heat and boiler load may include: obtaining boiler load test data and boiler output heat test data of the boiler operating under multiple steady-state conditions, and determining the mapping relationship between boiler output heat and boiler load by fitting the boiler load test data and the boiler output heat test data.

[0054] For example, establish a mapping relationship between boiler output heat and load:

[0055] Q s =f 1 (L)

[0056] In the formula, Q s is the boiler output heat, unit MW; L is the boiler load, unit t / h; f 1 is the relationship function between boiler load and boiler output heat. The specific determination method can be: select multiple steady-state operating conditions within the coverage of boiler automatic control operation range to obtain the boiler load L and output heat Q s , obtain a set of test data (L 1 , Q s1 )、(L 2 , Q s2 )、(L 3 , Q s3)……; Use appropriate functional relationship to fit the test data.

[0057] In this embodiment, fitting the boiler load test data and the boiler output heat test data may include: using a second-order or higher polynomial to fit the boiler load test data and the boiler output heat test data. n ≥ 2 fitting test data, where k i are the polynomial coefficients.

[0058] In one embodiment, determining the mapping relationship between boiler output heat and boiler load may include: determining the mapping relationship between boiler output heat and boiler load according to the input working fluid enthalpy and output working fluid enthalpy of the boiler. The specific formula may be as follows:

[0059]

[0060] In the formula, h 1 and h 2 They are the input and output enthalpy of the working fluid of the boiler respectively, in kJ / kg.

[0061] In one embodiment, determining the mapping relationship between boiler heat storage and boiler load may include: obtaining boiler load test data and boiler heat storage test data of the boiler operating under multiple steady-state conditions, and determining the mapping relationship between boiler heat storage and boiler load by fitting the boiler load test data and the boiler heat storage test data.

[0062] In this embodiment, boiler heat storage refers to the sum of the heat energy stored in flue gas, bed material, metal and other materials in each link of boiler heat transfer under different stable load conditions.

[0063] For example, when measuring boiler heat storage, 20°C can be uniformly selected as the reference temperature to establish a mapping relationship between boiler heat storage and boiler load:

[0064] E=f 2 (L)

[0065] Where, E is the boiler heat storage, unit GJ; f 2 is the relationship function between boiler load and boiler heat storage. For the heat transfer inertia control technology that does not change the heat transfer coefficient, its determination method can be: select multiple steady-state conditions within the coverage of the boiler automatic control operation range, test or calculate the boiler energy storage E corresponding to the boiler load L, and obtain a set of data (L 1 , E 1 )、(L 2 , E 2 )、(L 3 , E 3 )……; Use appropriate functional relationship to fit the test data.

[0066] In one embodiment, fitting the boiler load test data and the boiler heat storage test data may include: using a second-order or higher polynomial to fit the boiler load test data and the boiler heat storage test data. n≥2 fitting test data, where c i are the polynomial coefficients.

[0067] In one embodiment, the mapping relationship between boiler heat storage and boiler load may be determined by using a heat transfer numerical calculation method, including:

[0068] Taking the working fluid flow and temperature of the boiler at a stable load as boundary conditions, the inner wall temperature of the metal heating surface is calculated based on the flow heat transfer in the tube;

[0069] Taking the inner wall temperature of the metal heating surface as the boundary condition, the temperature distribution inside the metal material and the refractory and wear-resistant material in the boiler is calculated according to the solid heat conduction. Based on the temperature distribution inside the metal material and the refractory and wear-resistant material in the boiler and the thermophysical property database of the corresponding materials, the heat storage of the metal material and the refractory and wear-resistant material under the stable load is calculated.

[0070] Taking the temperature distribution inside the metal material and refractory and wear-resistant material in the boiler as the boundary condition, the temperature of the flue gas and bed material is calculated according to the heat transfer in the boiler, and the thermal physical property database of the flue gas and bed material is used to calculate the heat storage of the flue gas and bed material under the stable load;

[0071] The sum of the heat storage of metal materials and refractory and wear-resistant materials, flue gas and bed material under the load condition is determined as the boiler heat storage corresponding to the stable load.

[0072] In one embodiment, the heat transfer inertia calculation model may specifically be:

[0073]

[0074] Where, ΔT ht is the boiler heat transfer inertia, unit is s; E 1 and E 2 They are respectively the boiler heat storage at the initial and final states of boiler load change, in GJ; Q i and Q s are the boiler input and output heat, respectively, in MW; ω is the correction factor, dimensionless.

[0075] In one embodiment, the correction factor can be verified by actual furnace testing. Figure 2 Schematic diagram of the boiler heat transfer inertia test process in an embodiment of the present invention. Figure 2As shown in the figure, the response process of the main steam pressure (curve 2) after the boiler has a step change in the amount of fuel entering the furnace (curve 1). The time required for the main steam pressure to change from the initial state to the final state according to the maximum slope is the response time ΔT of the boiler heat transfer inertia. ht The value of ω can be verified by substituting the heat transfer inertia response time measured in the experiment together with the relevant parameters of the boiler equipment and the initial and final states of the variable load into the heat transfer inertia calculation model formula.

[0076] In this embodiment, when the actual furnace test is for one boiler or one test condition, the correction coefficient is a numerical value; when the actual furnace test is for multiple boilers or the initial and final state conditions of boiler load change, the correction coefficient is a function that changes with the initial and final state conditions of the boiler or the boiler load change.

[0077] The embodiment of the present invention further provides a boiler heat transfer inertia control and analysis method using the above boiler heat transfer inertia determination method. Figure 3 The flowchart of the boiler heat transfer inertia control analysis method is as follows: Figure 3 As shown, the method includes:

[0078] S301, obtaining the heat transfer inertia of the boiler before regulation determined by actual furnace test;

[0079] S302, determining the influencing parameters of the control on the boiler, wherein the influencing parameters include one or more of the following parameters: boiler heat storage at the initial and final states of boiler load change, and boiler input and output heat;

[0080] S303, determining a combination of influencing parameters that maximizes the change in boiler heat transfer inertia before and after regulation;

[0081] S304, determining the heat transfer inertia of the boiler after adjustment according to the combination of influencing parameters and using the heat transfer inertia calculation model;

[0082] S305, comparing the heat transfer inertia of the boiler after the regulation with the heat transfer inertia of the boiler before the regulation to determine the change in the heat transfer inertia of the boiler before and after the regulation;

[0083] S306. Analyze the control effect according to the change in the heat transfer inertia of the boiler before and after the control.

[0084] In one embodiment, for the technology of reducing the heat transfer inertia of the boiler, taking the technical control improvement scheme as an example, the ideal control effect can be analyzed and estimated according to the following steps: Obtain the heat transfer inertia of the boiler before control determined by the actual furnace test, recorded as ΔT ht1 ; Determine the parameters affecting the boiler, which include one or more of the following parameters: boiler heat storage at the initial and final states of boiler load change, and boiler input and output heat; for example, reducing the bed material inventory in a circulating fluidized bed boiler may affect E at the same time1 、E 2 , Q i , Q s , ω; determine the influencing parameter combination that maximizes the change in boiler heat transfer inertia before and after regulation; that is, when ΔT ht At maximum, E 1 、E 2 , Q i , Q s , ω; according to the combination of influencing parameters, using the heat transfer inertia calculation model to determine the heat transfer inertia of the boiler after regulation; making ΔT ht The maximum change is the best impact condition, and the ΔT corresponding to the best impact condition is calculated. ht Value, denoted as ΔT ht2 ω needs to be determined in combination with actual furnace tests; compare the heat transfer inertia of the boiler after regulation with the heat transfer inertia of the boiler before regulation to determine the change in the heat transfer inertia of the boiler before and after regulation; calculate ΔT before and after improvement ht The change in (ΔT ht2 -ΔT ht1 ), that is, the ideal effect of the scheme; according to the change of boiler heat transfer inertia before and after regulation, the regulation effect is analyzed, and the regulation effect before and after improvement is evaluated.

[0085] In one embodiment, the change in the heat transfer inertia of the boiler before and after the regulation is: the difference or quotient of the heat transfer inertia of the boiler after the regulation and the heat transfer inertia of the boiler before the regulation. ht2 -ΔT ht1 ) or ΔT ht2 / ΔT ht1 Formal characterization of ΔT ht The size of the change.

[0086] It should be noted that although the operations of the method of the present invention are described in a specific order in the drawings, this does not require or imply that the operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0087] The present invention also provides a boiler heat transfer inertia determination device, as described in the following embodiments. Since the principle of the device to solve the problem is similar to the boiler heat transfer inertia determination method, the implementation of the device can refer to the implementation of the boiler heat transfer inertia determination method, and the repeated parts will not be repeated.

[0088] Figure 4 FIG. 1 is a structural block diagram of a boiler heat transfer inertia determination device according to an embodiment of the present invention. Figure 4As shown, a boiler heat transfer inertia determination device 400 provided by the present invention includes:

[0089] A first mapping relationship determination module 401 is used to determine a mapping relationship between boiler output heat and boiler load;

[0090] A second mapping relationship determination module 402 is used to determine a mapping relationship between boiler heat storage and boiler load;

[0091] The heat transfer inertia calculation model determination module 403 is used to determine the heat transfer inertia calculation model according to the mapping relationship between the boiler output heat and the boiler load, and the mapping relationship between the boiler heat storage and the boiler load. The heat transfer inertia calculation model is used to calculate the boiler heat transfer inertia according to the boiler heat storage at the initial and final states of the boiler load change, and the boiler input and output heat;

[0092] The heat transfer inertia determination module 404 is used to determine the heat transfer inertia of the boiler using the heat transfer inertia calculation model.

[0093] In one embodiment, the first mapping relationship determination module 401 is specifically used to:

[0094] The boiler load test data and the boiler output heat test data of the boiler under multiple steady-state operating conditions are obtained, and the mapping relationship between the boiler output heat and the boiler load is determined by fitting the boiler load test data and the boiler output heat test data.

[0095] In this embodiment, the first mapping relationship determining module 401 is further configured to:

[0096] Second-order and higher-order polynomials are used to fit boiler load test data and boiler output heat test data.

[0097] In one embodiment, the first mapping relationship determining module 401 is specifically used to:

[0098] According to the input working fluid enthalpy and output working fluid enthalpy of the boiler, the mapping relationship between the boiler output heat and the boiler load is determined.

[0099] In one embodiment, the second mapping relationship determination module 402 is specifically configured to:

[0100] The boiler load test data and boiler heat storage test data of the boiler under multiple steady-state conditions are obtained, and the mapping relationship between the boiler heat storage and the boiler load is determined by fitting the boiler load test data and the boiler heat storage test data.

[0101] In this embodiment, the second mapping relationship determining module 402 is further configured to:

[0102] Second-order and higher-order polynomials are used to fit boiler load test data and boiler heat storage test data.

[0103] In one embodiment, the second mapping relationship determination module 402 is specifically configured to:

[0104] Taking the working fluid flow and temperature of the boiler at a stable load as boundary conditions, the inner wall temperature of the metal heating surface is calculated based on the flow heat transfer in the tube;

[0105] Taking the inner wall temperature of the metal heating surface as the boundary condition, the temperature distribution inside the metal material and the refractory and wear-resistant material in the boiler is calculated according to the solid heat conduction. Based on the temperature distribution inside the metal material and the refractory and wear-resistant material in the boiler and the thermophysical property database of the corresponding materials, the heat storage of the metal material and the refractory and wear-resistant material under the stable load is calculated.

[0106] Taking the temperature distribution inside the metal material and refractory and wear-resistant material in the boiler as the boundary condition, the temperature of the flue gas and bed material is calculated according to the heat transfer in the boiler, and the thermal physical property database of the flue gas and bed material is used to calculate the heat storage of the flue gas and bed material under the stable load;

[0107] The sum of the heat storage of metal materials and refractory and wear-resistant materials, flue gas and bed material under the load condition is determined as the boiler heat storage corresponding to the stable load.

[0108] In one embodiment, the heat transfer inertia calculation model is specifically:

[0109]

[0110] Where, ΔT ht is the boiler heat transfer inertia; E 1 and E 2 They are respectively the boiler heat storage at the initial and final states of boiler load change; Q i and Q s are the boiler input and output heat respectively; ω is the correction coefficient.

[0111] In one embodiment, the correction factor is verified by actual furnace testing.

[0112] In one embodiment, when the actual furnace test is for one boiler or one test condition, the correction coefficient is a numerical value; when the actual furnace test is for multiple boilers or the initial and final state conditions of boiler load change, the correction coefficient is a function that changes with the initial and final state conditions of the boiler or the boiler load change.

[0113] The embodiment of the present invention also provides a boiler heat transfer inertia control and analysis device using the above-mentioned boiler heat transfer inertia determination device, as described in the following embodiment. Since the principle of solving the problem by the device is similar to that of the boiler heat transfer inertia control and analysis method, the implementation of the device can refer to the implementation of the boiler heat transfer inertia control and analysis method, and the repeated parts will not be repeated.

[0114] Figure 5 FIG. 1 is a structural block diagram of a boiler heat transfer inertia control and analysis device according to an embodiment of the present invention. Figure 5 As shown, a boiler heat transfer inertia control and analysis device 500 provided by the present invention includes:

[0115] The heat transfer inertia determination module 501 before regulation is used to obtain the heat transfer inertia of the boiler before regulation through actual furnace test;

[0116] The influencing parameter determination module 502 is used to determine the influencing parameters of the control on the boiler, wherein the influencing parameters include one or more of the following parameters: boiler heat storage at the initial and final states of boiler load change, and boiler input and output heat;

[0117] The influencing parameter combination determination module 503 is used to determine the influencing parameter combination that maximizes the change in boiler heat transfer inertia before and after regulation.

[0118] A module 504 for determining heat transfer inertia after regulation, for determining the heat transfer inertia of the boiler after regulation according to the combination of influencing parameters and using the heat transfer inertia calculation model;

[0119] The heat transfer inertia change determination module 505 is used to compare the heat transfer inertia of the boiler after regulation with the heat transfer inertia of the boiler before regulation to determine the change in the heat transfer inertia of the boiler before and after regulation;

[0120] The analysis module 506 is used to analyze the control effect according to the change in the heat transfer inertia of the boiler before and after the control.

[0121] In one embodiment, the change in the heat transfer inertia of the boiler before and after the regulation is: the difference or quotient of the heat transfer inertia of the boiler after the regulation and the heat transfer inertia of the boiler before the regulation.

[0122] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned boiler heat transfer inertia determination method or boiler heat transfer inertia control and analysis method when executing the computer program.

[0123] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-mentioned boiler heat transfer inertia determination method or boiler heat transfer inertia control and analysis method.

[0124] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the method for determining the heat transfer inertia of a boiler or the method for regulating and analyzing the heat transfer inertia of a boiler is implemented.

[0125] Compared with the technical solution of building a heat transfer inertia model for a graphite heating element or a thermal system in the prior art, the embodiment of the present invention determines the mapping relationship between the boiler output heat and the boiler load; determines the mapping relationship between the boiler heat storage and the boiler load; determines the heat transfer inertia calculation model according to the mapping relationship between the boiler output heat and the boiler load, and the mapping relationship between the boiler heat storage and the boiler load; the heat transfer inertia calculation model is used to calculate the boiler heat transfer inertia according to the boiler heat storage at the initial and final states of the boiler load change, as well as the boiler input and output heat; uses the heat transfer inertia calculation model to determine the boiler heat transfer inertia, thereby achieving accurate characterization of the boiler heat transfer inertia, and providing basic data for the comparison of boiler variable load capacity improvement plans and the design of automatic control systems.

[0126] The embodiment of the present invention also obtains the heat transfer inertia of the boiler before regulation determined by actual furnace tests; determines the influencing parameters of the regulation on the boiler; determines the influencing parameter combination that maximizes the change in the heat transfer inertia of the boiler before and after regulation among the influencing parameters; determines the heat transfer inertia of the boiler after regulation using the heat transfer inertia calculation model according to the influencing parameter combination; compares the heat transfer inertia of the boiler after regulation with the heat transfer inertia of the boiler before regulation to determine the change in the heat transfer inertia of the boiler before and after regulation; and analyzes the regulation effect according to the change in the heat transfer inertia of the boiler before and after regulation, thereby achieving quantitative evaluation of the improvement effect of the boiler heat transfer inertia regulation technology.

[0127] The embodiment of the present invention also verifies the correction parameters in the heat transfer inertia calculation model through actual furnace tests to improve the accuracy of the heat transfer inertia calculation model.

[0128] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0129] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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 processes in the flowchart and / or block diagram. 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.

[0130] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0131] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0132] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for determining the heat transfer inertia of a boiler, characterized in that: include: Determine the mapping relationship between boiler output heat and boiler load; Determine the mapping relationship between boiler heat storage and boiler load; According to the mapping relationship between boiler output heat and boiler load, and the mapping relationship between boiler heat storage and boiler load, a heat transfer inertia calculation model is determined, wherein the heat transfer inertia calculation model is used to calculate the boiler heat transfer inertia according to the boiler heat storage at the initial and final states of boiler load change, and the boiler input and output heat; Determining the heat transfer inertia of the boiler by using the heat transfer inertia calculation model; Determine the mapping relationship between boiler heat storage and boiler load, including: Taking the working fluid flow and temperature of the boiler at a stable load as boundary conditions, the inner wall temperature of the metal heating surface is calculated based on the flow heat transfer in the tube; Taking the inner wall temperature of the metal heating surface as the boundary condition, the temperature distribution inside the metal material and the refractory and wear-resistant material in the boiler is calculated according to the solid heat conduction. Based on the temperature distribution inside the metal material and the refractory and wear-resistant material in the boiler and the thermophysical property database of the corresponding materials, the heat storage of the metal material and the refractory and wear-resistant material under the stable load is calculated. Taking the temperature distribution inside the metal material and refractory and wear-resistant material in the boiler as the boundary condition, the temperature of the flue gas and bed material is calculated according to the heat transfer in the boiler, and the thermal physical property database of the flue gas and bed material is used to calculate the heat storage of the flue gas and bed material under the stable load; The sum of the heat storage of metal materials and refractory and wear-resistant materials, flue gas and bed material under the load condition is determined as the boiler heat storage corresponding to the stable load; The heat transfer inertia calculation model is specifically: In the formula, ΔT ht is the boiler heat transfer inertia; E1 and E2 are the boiler heat storage at the initial and final states of boiler load change respectively; Q i and Q s are the boiler input and output heat respectively; ω is the correction coefficient.

2. The method according to claim 1, characterized in that Determine the mapping relationship between boiler output heat and boiler load, including: The boiler load test data and the boiler output heat test data of the boiler under multiple steady-state operating conditions are obtained, and the mapping relationship between the boiler output heat and the boiler load is determined by fitting the boiler load test data and the boiler output heat test data.

3. The method according to claim 2, characterized in that Fitting boiler load test data and boiler output heat test data, including: Second-order and higher-order polynomials are used to fit boiler load test data and boiler output heat test data.

4. The method according to claim 1, characterized in that Determine the mapping relationship between boiler output heat and boiler load, including: According to the input working fluid enthalpy and output working fluid enthalpy of the boiler, the mapping relationship between the boiler output heat and the boiler load is determined.

5. The method according to claim 1, characterized in that Determine the mapping relationship between boiler heat storage and boiler load, including: The boiler load test data and boiler heat storage test data of the boiler under multiple steady-state conditions are obtained, and the mapping relationship between the boiler heat storage and the boiler load is determined by fitting the boiler load test data and the boiler heat storage test data.

6. The method according to claim 5, characterized in that Fitting boiler load test data and boiler heat storage test data, including: Second-order and higher-order polynomials are used to fit boiler load test data and boiler heat storage test data.

7. The method according to claim 1, characterized in that The correction factor is verified through actual furnace tests.

8. The method according to claim 7, characterized in that When the actual furnace test is for one boiler or one test condition, the correction coefficient is a numerical value; when the actual furnace test is for multiple boilers or the initial and final state conditions of boiler load change, the correction coefficient is a function that changes with the boiler or the initial and final state conditions of boiler load change.

9. A boiler heat transfer inertia control and analysis method using the boiler heat transfer inertia determination method according to any one of claims 1 to 8, characterized in that: include: Obtain the boiler heat transfer inertia before regulation determined through actual furnace tests; Determine the influencing parameters of the control on the boiler, wherein the influencing parameters include one or more of the following parameters: boiler heat storage at the initial and final states of boiler load change, and boiler input and output heat; Determine the combination of influencing parameters that maximizes the change in boiler heat transfer inertia before and after regulation; According to the combination of influencing parameters, using the heat transfer inertia calculation model, determining the heat transfer inertia of the boiler after regulation; The heat transfer inertia of the boiler after regulation is compared with the heat transfer inertia of the boiler before regulation to determine the change in the heat transfer inertia of the boiler before and after regulation; The regulation effect is analyzed based on the change in boiler heat transfer inertia before and after regulation.

10. The method according to claim 9, characterized in that The change in the heat transfer inertia of the boiler before and after regulation is: the difference or quotient of the heat transfer inertia of the boiler after regulation and the heat transfer inertia of the boiler before regulation.

11. A device for determining heat transfer inertia of a boiler, characterized in that: include: A first mapping relationship determination module, used to determine a mapping relationship between boiler output heat and boiler load; A second mapping relationship determination module is used to determine the mapping relationship between boiler heat storage and boiler load; A heat transfer inertia calculation model determination module is used to determine a heat transfer inertia calculation model according to a mapping relationship between boiler output heat and boiler load, and a mapping relationship between boiler heat storage and boiler load, wherein the heat transfer inertia calculation model is used to calculate the boiler heat transfer inertia according to the boiler heat storage at the initial and final states of boiler load change, and the boiler input and output heat; A heat transfer inertia determination module, used to determine the heat transfer inertia of the boiler using the heat transfer inertia calculation model; The second mapping relationship determination module is specifically used for: Taking the working fluid flow and temperature of the boiler at a stable load as boundary conditions, the inner wall temperature of the metal heating surface is calculated based on the flow heat transfer in the tube; Taking the inner wall temperature of the metal heating surface as the boundary condition, the temperature distribution inside the metal material and the refractory and wear-resistant material in the boiler is calculated according to the solid heat conduction. Based on the temperature distribution inside the metal material and the refractory and wear-resistant material in the boiler and the thermophysical property database of the corresponding materials, the heat storage of the metal material and the refractory and wear-resistant material under the stable load is calculated. Taking the temperature distribution inside the metal material and refractory and wear-resistant material in the boiler as the boundary condition, the temperature of the flue gas and bed material is calculated according to the heat transfer in the boiler, and the thermal physical property database of the flue gas and bed material is used to calculate the heat storage of the flue gas and bed material under the stable load; The sum of the heat storage of metal materials and refractory and wear-resistant materials, flue gas and bed material under the load condition is determined as the boiler heat storage corresponding to the stable load; The heat transfer inertia calculation model is specifically: In the formula, ΔT ht is the boiler heat transfer inertia; E1 and E2 are the boiler heat storage at the initial and final states of boiler load change respectively; Q i and Q s are the boiler input and output heat respectively; ω is the correction coefficient.

12. The device according to claim 11, characterized in that The first mapping relationship determination module is specifically used for: The boiler load test data and the boiler output heat test data of the boiler under multiple steady-state operating conditions are obtained, and the mapping relationship between the boiler output heat and the boiler load is determined by fitting the boiler load test data and the boiler output heat test data.

13. The device according to claim 12, characterized in that The first mapping relationship determination module is specifically used for: Second-order and higher-order polynomials are used to fit boiler load test data and boiler output heat test data.

14. The device according to claim 11, characterized in that The first mapping relationship determination module is specifically used for: According to the input working fluid enthalpy and output working fluid enthalpy of the boiler, the mapping relationship between the boiler output heat and the boiler load is determined.

15. The device according to claim 11, characterized in that The second mapping relationship determination module is specifically used for: The boiler load test data and boiler heat storage test data of the boiler under multiple steady-state conditions are obtained, and the mapping relationship between the boiler heat storage and the boiler load is determined by fitting the boiler load test data and the boiler heat storage test data.

16. The device according to claim 15, characterized in that The second mapping relationship determination module is specifically used for: Second-order and higher-order polynomials are used to fit boiler load test data and boiler heat storage test data.

17. The device according to claim 11, characterized in that The correction factor is verified through actual furnace tests.

18. The device according to claim 17, characterized in that When the actual furnace test is for one boiler or one test condition, the correction coefficient is a numerical value; when the actual furnace test is for multiple boilers or the initial and final state conditions of boiler load change, the correction coefficient is a function that changes with the boiler or the initial and final state conditions of boiler load change.

19. A boiler heat transfer inertia control and analysis device using the boiler heat transfer inertia determination device according to any one of claims 11 to 18, characterized in that: include: A module for determining heat transfer inertia before regulation, used to obtain the heat transfer inertia of the boiler before regulation determined through actual furnace tests; An influencing parameter determination module is used to determine the influencing parameters of the control on the boiler, wherein the influencing parameters include one or more of the following parameters: boiler heat storage at the initial and final states of boiler load change, and boiler input and output heat; An influencing parameter combination determination module is used to determine the influencing parameter combination that maximizes the change in boiler heat transfer inertia before and after regulation among the influencing parameters; A module for determining heat transfer inertia after regulation, used to determine the heat transfer inertia of the boiler after regulation according to the combination of influencing parameters and using the heat transfer inertia calculation model; A heat transfer inertia change determination module is used to compare the heat transfer inertia of the boiler after regulation with the heat transfer inertia of the boiler before regulation to determine the change in the heat transfer inertia of the boiler before and after regulation; The analysis module is used to analyze the control effect according to the change of boiler heat transfer inertia before and after control.

20. The boiler heat transfer inertia control and analysis device according to claim 19, characterized in that: The change in the heat transfer inertia of the boiler before and after regulation is: the difference or quotient of the heat transfer inertia of the boiler after regulation and the heat transfer inertia of the boiler before regulation.

21. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 10 is implemented.

22. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

23. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

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