CN118194591A - Method, device and equipment for calculating actual furnace heat load deviation coefficient of water-cooled wall of boiler - Google Patents
Method, device and equipment for calculating actual furnace heat load deviation coefficient of water-cooled wall of boiler Download PDFInfo
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Abstract
The invention discloses a method, a device and equipment for calculating a real heat load deviation coefficient of a boiler water-cooled wall, which comprises the following steps: s1, acquiring flow, inlet and outlet pressure, inlet and outlet enthalpy values of a water-cooled wall and actually measured outlet steam temperature of each loop; s2, calculating theoretical outlet steam temperature of each loop of the water-cooled wall according to flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and preset real furnace heat load deviation coefficients of each loop; s3, judging whether the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than a set value, if not, correcting the actual furnace heat load deviation coefficient of the corresponding loop, and executing S2 until the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than the set value, and outputting the actual furnace heat load deviation coefficient. The invention aims to accurately obtain the heat load deviation coefficient of the boiler so as to better judge the heating condition in the boiler.
Description
Technical Field
The invention belongs to the field of boilers of thermal power generating units, and particularly relates to a method, a device and equipment for calculating a real furnace heat load deviation coefficient of a boiler water-cooled wall.
Background
With the large-scale grid connection of renewable clean energy sources, the deep peak regulation requirement of the thermal generator set is improved, and the boiler is required to safely and stably operate under lower load. Under the lower operating condition of the boiler, the problems that the boiler normally works due to the fact that the water wall overtemperature alarm and even tube explosion occur due to factors such as small flow rate in the boiler, unstable combustion, heat load deviation and the like can be caused.
At present, in order to monitor the overtemperature tube explosion problem in the operation process of a boiler, a power plant generally adopts outlet steam temperature data directly measured by arranging a thermocouple at the outlet of a hearth to approximately know the heating condition in the boiler. However, the steam temperature at the outlet of the hearth is not only related to the heat load applied to the heating surface, but also related to the flow rate of working medium in the pipe, the heat transfer property of the pipe and the like, so that the steam temperature at the outlet of the hearth is used for judging the heating condition in the furnace to be unilateral. In actual operation, if the boiler heat load deviation coefficient can be accurately calculated, power plant staff can grasp the actual heating condition of the heating surface of the water-cooled wall of the boiler in real time, and the metal pipe wall with strong heating can be cooled in advance, so that the phenomenon of overtemperature pipe explosion is avoided.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method, a device and equipment for calculating the actual boiler heat load deviation coefficient of a boiler water-cooled wall, which aim to accurately obtain the boiler heat load deviation coefficient and further better judge the heating condition in the boiler.
In order to solve the technical problems, the invention is realized by the following technical scheme:
according to a first aspect of the invention, a method for calculating a real heat load deviation coefficient of a boiler water wall is provided, comprising the following steps:
S1, acquiring flow, inlet and outlet pressure, inlet and outlet enthalpy values of a water-cooled wall and actually measured outlet steam temperature of each loop;
S2, calculating theoretical outlet steam temperature of each loop of the water-cooled wall according to flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and preset real furnace heat load deviation coefficients of each loop;
S3, judging whether the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than a set value, if not, correcting the actual furnace heat load deviation coefficient of the corresponding loop, and executing S2 until the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than the set value, and outputting the actual furnace heat load deviation coefficient.
In a possible implementation manner of the first aspect, the correcting the actual furnace heat load deviation coefficient of the corresponding loop includes:
Obtaining an outlet actual enthalpy value of a corresponding loop according to the outlet pressure of the water-cooled wall and the actually measured outlet steam temperature of the corresponding loop;
Calculating the outlet average enthalpy value of the corresponding loop by using the outlet actual enthalpy value of the corresponding loop;
Obtaining an outlet theoretical enthalpy value of a corresponding loop according to the outlet pressure of the water-cooled wall and the theoretical outlet steam temperature of the corresponding loop;
and correcting the actual furnace heat load deviation coefficient by using the outlet average enthalpy value of the corresponding loop, the outlet actual enthalpy value of the corresponding loop and the outlet theoretical enthalpy value of the corresponding loop.
In a possible implementation manner of the first aspect, the calculating, using the actual enthalpy value of the outlet of the corresponding loop, an average enthalpy value of the outlet of the corresponding loop is specifically:
In the method, in the process of the invention, The outlet average enthalpy value of the i loop of the water-cooled wall; h r (i) is the actual enthalpy value of the outlet of the i loop of the water-cooled wall; n is the total number of loops.
In one possible implementation manner of the first aspect, the correcting the actual furnace heat load deviation coefficient by using the average enthalpy value of the outlet of the corresponding loop, the actual enthalpy value of the outlet of the corresponding loop, and the theoretical enthalpy value of the outlet of the corresponding loop specifically is:
Wherein eta' (i) is the corrected real furnace heat load deviation coefficient of the i loop; η (i) is the actual furnace heat load deviation coefficient of the i loop before correction; h jsz (i) is the theoretical enthalpy value of the outlet of the i loop of the water wall.
In one possible implementation manner of the first aspect, the obtaining, according to the outlet pressure of the water wall and the measured outlet steam temperature of the corresponding loop, an outlet actual enthalpy value of the corresponding loop specifically includes:
And according to the outlet pressure of the water-cooled wall and the measured outlet steam temperature of the corresponding loop, the outlet actual enthalpy value of the corresponding loop is searched from the NIST REFPROP database.
In one possible implementation manner of the first aspect, the obtaining, according to the outlet pressure of the water wall and the theoretical outlet steam temperature of the corresponding loop, the outlet theoretical enthalpy value of the corresponding loop is specifically:
And according to the outlet pressure of the water-cooled wall and the theoretical outlet steam temperature of the corresponding loop, searching the theoretical enthalpy value of the outlet of the corresponding loop from the NIST REFPROP database.
In one possible implementation manner of the first aspect, the calculating the theoretical outlet steam temperature of each loop of the water-cooled wall according to the flow, the inlet and outlet pressure, the inlet and outlet enthalpy value of the water-cooled wall and the preset real furnace heat load deviation coefficient of each loop specifically includes:
and calculating the theoretical outlet steam temperature of each loop of the water-cooling wall by using a hydrodynamic calculation model according to the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooling wall and a preset real furnace heat load deviation coefficient of each loop.
According to a second aspect of the present invention, a boiler water wall real furnace heat load deviation coefficient calculating device includes:
The acquisition module is used for acquiring the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and actually measured outlet steam temperature of each loop;
the calculation module is used for calculating theoretical outlet steam temperature of each loop of the water-cooled wall according to the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and preset real furnace heat load deviation coefficients of each loop;
And the correction module is used for judging whether the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than a set value, if not, correcting the actual furnace heat load deviation coefficient of the corresponding loop, and converting to the execution calculation module until the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than the set value, and outputting the actual furnace heat load deviation coefficient.
According to a third aspect of the invention, an apparatus comprises a memory, a processor and a computer program stored in the memory and operable on the processor, wherein the processor implements the steps of the method for calculating the actual boiler heat load deviation coefficient of the boiler water wall when executing the computer program.
According to a fourth aspect of the present invention, a computer readable storage medium stores a computer program which, when executed by a processor, implements the steps of the method for calculating a boiler water wall real furnace thermal load deviation coefficient.
Compared with the prior art, the invention has at least the following beneficial effects:
The invention provides a calculation method of a real furnace heat load deviation coefficient of a boiler water-cooled wall, which comprises the steps of obtaining flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and actually measured outlet steam temperature of each loop; then calculating theoretical outlet steam temperature of each loop of the water-cooled wall according to the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and preset real furnace heat load deviation coefficients of each loop; and finally judging whether the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than a set value, if not, correcting the actual furnace heat load deviation coefficient of the corresponding loop, performing cycle execution until the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than the set value, outputting the actual furnace heat load deviation coefficient, accurately obtaining the boiler heat load deviation coefficient, further judging the heating condition in the furnace, grasping the actual heating condition in the furnace and ensuring the safe pipe wall operation of the boiler during deep peak load regulation, effectively avoiding overtemperature alarm and even pipe explosion, and having practical guiding significance for the operation control of the boiler.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram showing an example of a method for calculating a real heat load deviation coefficient of a boiler water wall according to an embodiment of the present invention;
FIG. 2 is a graph showing the comparison of the calculated values of the program using the actual furnace heat load and the actual furnace measured value outlet steam temperature;
FIG. 3 is a Visual Basic display interface of the actual furnace heat load deviation calculation.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the embodiment of the application provides a method for calculating a real heat load deviation coefficient of a boiler water wall, which specifically comprises the following steps:
S1, acquiring flow, inlet and outlet pressure, inlet and outlet enthalpy values of a water-cooled wall and actually measuring outlet steam temperature of each loop.
It should be appreciated that these parameters are related to the boiler operating load, referred to as real-time data. The parameters are obtained by measuring the boiler water wall in real time through professional measuring equipment and recording the measured data.
By way of example, the ACCESS database is used to obtain real-time data by connecting the plant-level monitoring information system with the plant DCS system or MIS system and the on-line measuring points.
S2, calculating theoretical outlet steam temperature of each loop of the water-cooled wall according to the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and preset real furnace heat load deviation coefficients of each loop.
Specifically, in this step, the parameters are substituted into the model by using a hydrodynamic calculation model, and calculation is performed, so that the theoretical outlet steam temperature of each loop of the water-cooled wall is obtained.
The hydrodynamic calculation model is established by a flow network system method. Illustratively, hydrodynamic computational model modeling is performed in accordance with relevant computational criteria. The hydrodynamic force calculation model modeling mainly comprises the establishment of a steam-water flow path, a hydrodynamic force calculation loop and pipe section division. According to the data requirement required by hydrodynamic force calculation, four parts of data, namely boiler structure parameter data, flow network data, flow pressure initial value data, heat load and heat load deviation coefficient initial data, are mainly required, and the parts of data cannot be changed along with the change of the boiler load, and are called static data. Static data are stored under the same name and price folder of the hydrodynamic program calculation program in the form of a dat file. The hydrodynamic program reads dynamic data in the ACCESS database and static data of dat files stored in the same folder of the hydrodynamic calculation program.
Illustratively, hydrodynamic calculations are performed by Visual Basic invoking a DLL generated by the FORTRAN. The hydrodynamic force calculation program is written in FORTRAN language.
S3, judging whether the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than a set value (shown in fig. 2), if not, correcting the actual furnace heat load deviation coefficient of the corresponding loop, and executing S2 until the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than the set value, and outputting the actual furnace heat load deviation coefficient.
That is, after each correction is completed, the process returns to step S2 again, and the theoretical outlet steam temperature of each loop is recalculated by using the corrected actual furnace heat load deviation coefficient. And then, the step S3 is carried out again to judge, and the circulation is carried out until the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than the set value. At this point, the final real furnace heat load deviation coefficient is obtained, which is used in the subsequent boiler operation and optimization process.
It should be noted that this set value is generally determined according to actual needs and engineering experience, and is exemplified by 2% for measuring whether the deviation between the theoretical value and the actual value is within an acceptable range.
The calculation result is transmitted to the ACCESS database for long-time storage, so that the comprehensive analysis of the boiler operation state by the staff is facilitated. The data is stored, transmitted and input through the ACCESS database, so that the management of the data by workers is facilitated, and the existing database of the boiler can be connected with the ACCESS database to read the actual furnace operation parameter information required by calculation.
In one embodiment, the actual furnace heat load deviation coefficient of the corresponding loop is corrected by the following steps:
a. And obtaining the actual enthalpy value of the outlet of the corresponding loop according to the outlet pressure of the water-cooled wall and the actual outlet steam temperature of the corresponding loop.
Preferably, the actual enthalpy value of the outlet of the corresponding loop is retrieved from a NIST REFPROP database according to the outlet pressure of the water-cooled wall and the measured outlet steam temperature of the corresponding loop, namely
Hr(i)＝f(ti,p)
Wherein H r (i) is the actual enthalpy value of the outlet of the i loop of the water-cooled wall; the measured outlet steam temperature of the ith loop of t i, p is the outlet pressure of the water-cooled wall.
B. calculating the outlet average enthalpy value of the corresponding loop by using the outlet actual enthalpy value of the corresponding loop, wherein a calculation formula is specifically as follows:
In the method, in the process of the invention, The outlet average enthalpy value of the i loop of the water-cooled wall; h r (i) is the actual enthalpy value of the outlet of the i loop of the water-cooled wall; n is the total number of loops.
C. And obtaining the theoretical enthalpy value of the outlet of the corresponding loop according to the outlet pressure of the water-cooled wall and the theoretical outlet steam temperature of the corresponding loop.
Preferably, the theoretical enthalpy value of the outlet of the corresponding loop is retrieved from the NIST REFPROP database according to the outlet pressure of the water wall and the theoretical outlet steam temperature of the corresponding loop.
D. And correcting the actual furnace heat load deviation coefficient by using the outlet average enthalpy value of the corresponding loop, the outlet actual enthalpy value of the corresponding loop and the outlet theoretical enthalpy value of the corresponding loop, wherein the calculation formula is specifically as follows:
Wherein eta' (i) is the corrected real furnace heat load deviation coefficient of the i loop; η (i) is the actual furnace heat load deviation coefficient of the i loop before correction; h jsz (i) is the theoretical enthalpy value of the outlet of the i loop of the water wall.
Through the steps, the actual furnace heat load deviation coefficient of the boiler water wall can be accurately calculated, and powerful guarantee is provided for safe and efficient operation of the boiler. Meanwhile, the method has strong operability and practicability and can be widely applied to actual engineering.
Based on the embodiment, preferably, visual chart display is generated for the actual furnace heat load deviation coefficient according to the operation requirement of a user. As shown in fig. 3, an exemplary Visual Basic screen display is used to intuitively display a graph of the calculation result. The method not only calculates the actual heat load deviation coefficient of the furnace, but also displays the actual heat load deviation coefficient result by Visual Basic programming, so that operators can intuitively know the actual running condition in the furnace, grasp the running condition of the water-cooled wall of the boiler clearly and intuitively, provide reference for the decision of operators, and have strong man-machine interaction. If the heat load deviation coefficient of a certain pipe screen is too high or the outlet steam temperature deviation is too large, operators can find out in a short time and react at the first time, so that the operation of the boiler water wall is in a safe state.
For example, software of a method for calculating the actual furnace heat load deviation coefficient of the water-cooled wall of the boiler written in Visual Basic language is installed on an operator computer, and corresponding operation is carried out according to software prompts, so that the actual furnace heat load coefficient of the boiler can be calculated and displayed graphically. Besides the calculation results displayed on the result page, the results such as pressure drop and flow are stored in the same folder of the calculation software in the form of a dat file, so that data can be provided for an operator to comprehensively analyze the running state of the boiler.
The measuring points on the wall of the outlet pipe of the water-cooled wall have the function of accurately measuring the outlet steam temperature, and the actual heat load deviation coefficient of the boiler is calculated according to the actual outlet steam temperature of the hearth, so that the actual heating condition of the water-cooled wall can be accurately known.
The embodiment of the application also provides a device for calculating the actual furnace heat load deviation coefficient of the water-cooled wall of the boiler, which specifically comprises the following modules:
the acquisition module is used for acquiring the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and actually measured outlet steam temperature of each loop.
The calculation module is used for calculating the theoretical outlet steam temperature of each loop of the water-cooled wall according to the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and the preset real furnace heat load deviation coefficient of each loop.
And the correction module is used for judging whether the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than a set value, if not, correcting the actual furnace heat load deviation coefficient of the corresponding loop, and converting to the execution calculation module until the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than the set value, and outputting the actual furnace heat load deviation coefficient.
For specific implementation manners of the above modules, reference may be made to the corresponding contents disclosed in the foregoing embodiments, and no further description is given here.
In one embodiment, the invention provides a computer device comprising a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), but also other general purpose processors, digital signal processors (DIGITAL SIGNAL Processor, DSP), application Specific Integrated Circuits (ASIC), off-the-shelf Programmable gate arrays (Field-Programmable GATEARRAY, FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are computing and control cores of the terminal adapted to implement one or more instructions, in particular adapted to load and execute one or more instructions to implement a corresponding method flow or a corresponding function; the processor provided by the embodiment of the invention can be used for realizing the operation of a method for calculating the actual furnace heat load deviation coefficient of the water-cooled wall of the boiler.
In one embodiment, a method for calculating the actual furnace heat load deviation coefficient of the water-cooled wall of the boiler can be stored in a computer readable storage medium if the method is realized in the form of a software functional unit and sold or used as a separate product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. Computer-readable storage media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data.
The computer storage media may be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, non-volatile memory (NANDFLASH), solid State Disk (SSD)), etc.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the present invention, the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The method for calculating the actual furnace heat load deviation coefficient of the water-cooled wall of the boiler is characterized by comprising the following steps of:
S1, acquiring flow, inlet and outlet pressure, inlet and outlet enthalpy values of a water-cooled wall and actually measured outlet steam temperature of each loop;
S2, calculating theoretical outlet steam temperature of each loop of the water-cooled wall according to flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and preset real furnace heat load deviation coefficients of each loop;
S3, judging whether the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than a set value, if not, correcting the actual furnace heat load deviation coefficient of the corresponding loop, and executing S2 until the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than the set value, and outputting the actual furnace heat load deviation coefficient.
2. The method for calculating the actual furnace heat load deviation coefficient of the water-cooled wall of the boiler according to claim 1, wherein the step of correcting the actual furnace heat load deviation coefficient of the corresponding loop comprises the steps of:
Obtaining an outlet actual enthalpy value of a corresponding loop according to the outlet pressure of the water-cooled wall and the actually measured outlet steam temperature of the corresponding loop;
Calculating the outlet average enthalpy value of the corresponding loop by using the outlet actual enthalpy value of the corresponding loop;
Obtaining an outlet theoretical enthalpy value of a corresponding loop according to the outlet pressure of the water-cooled wall and the theoretical outlet steam temperature of the corresponding loop;
and correcting the actual furnace heat load deviation coefficient by using the outlet average enthalpy value of the corresponding loop, the outlet actual enthalpy value of the corresponding loop and the outlet theoretical enthalpy value of the corresponding loop.
3. The method for calculating the actual heat load deviation coefficient of the boiler water wall furnace according to claim 2, wherein the calculating the average enthalpy value of the outlet of the corresponding loop by using the actual enthalpy value of the outlet of the corresponding loop comprises the following steps:
In the method, in the process of the invention, The outlet average enthalpy value of the i loop of the water-cooled wall; h r (i) is the actual enthalpy value of the outlet of the i loop of the water-cooled wall; n is the total number of loops.
4. The method for calculating the actual heat load deviation coefficient of the boiler water wall according to claim 3, wherein the correction of the actual heat load deviation coefficient of the boiler is performed by using the average enthalpy value of the outlet of the corresponding loop, the actual enthalpy value of the outlet of the corresponding loop and the theoretical enthalpy value of the outlet of the corresponding loop, specifically:
Wherein eta' (i) is the corrected real furnace heat load deviation coefficient of the i loop; η (i) is the actual furnace heat load deviation coefficient of the i loop before correction; h jsz (i) is the theoretical enthalpy value of the outlet of the i loop of the water wall.
5. The method for calculating the actual heat load deviation coefficient of the boiler water-cooled wall according to claim 2, wherein the obtaining the actual enthalpy value of the outlet of the corresponding loop according to the outlet pressure of the water-cooled wall and the actual outlet steam temperature of the corresponding loop specifically comprises:
And according to the outlet pressure of the water-cooled wall and the measured outlet steam temperature of the corresponding loop, the outlet actual enthalpy value of the corresponding loop is searched from the NIST REFPROP database.
6. The method for calculating the actual heat load deviation coefficient of the boiler water wall according to claim 2, wherein the obtaining the theoretical enthalpy value of the outlet of the corresponding loop according to the outlet pressure of the water wall and the theoretical outlet steam temperature of the corresponding loop is specifically as follows:
And according to the outlet pressure of the water-cooled wall and the theoretical outlet steam temperature of the corresponding loop, searching the theoretical enthalpy value of the outlet of the corresponding loop from the NIST REFPROP database.
7. The method for calculating the actual furnace heat load deviation coefficient of the water-cooled wall of the boiler according to claim 1, wherein the calculating the theoretical outlet steam temperature of each loop of the water-cooled wall according to the flow, the inlet and outlet pressure, the inlet and outlet enthalpy value of the water-cooled wall and the preset actual furnace heat load deviation coefficient of each loop comprises the following steps:
and calculating the theoretical outlet steam temperature of each loop of the water-cooling wall by using a hydrodynamic calculation model according to the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooling wall and a preset real furnace heat load deviation coefficient of each loop.
8. The utility model provides a boiler water-cooled wall real stove thermal load deviation coefficient calculation device which characterized in that includes:
The acquisition module is used for acquiring the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and actually measured outlet steam temperature of each loop;
the calculation module is used for calculating theoretical outlet steam temperature of each loop of the water-cooled wall according to the flow, inlet and outlet pressure, inlet and outlet enthalpy values of the water-cooled wall and preset real furnace heat load deviation coefficients of each loop;
And the correction module is used for judging whether the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than a set value, if not, correcting the actual furnace heat load deviation coefficient of the corresponding loop, and converting to the execution calculation module until the error between the theoretical outlet steam temperature of each loop and the actually measured outlet steam temperature of each loop is smaller than the set value, and outputting the actual furnace heat load deviation coefficient.
9. An apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, performs the steps of a method for calculating a real boiler heat load deviation coefficient of a boiler water wall according to any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps of a boiler water wall real furnace heat load deviation coefficient calculation method according to any one of claims 1 to 7.
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