CN115263467A - Method and system for determining upper and lower limits of operating power of single-extraction cogeneration extraction condensing unit - Google Patents

Method and system for determining upper and lower limits of operating power of single-extraction cogeneration extraction condensing unit Download PDF

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CN115263467A
CN115263467A CN202210855001.9A CN202210855001A CN115263467A CN 115263467 A CN115263467 A CN 115263467A CN 202210855001 A CN202210855001 A CN 202210855001A CN 115263467 A CN115263467 A CN 115263467A
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extraction
power
determining
cogeneration
steam
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李琳
苗井泉
姬锋军
张涛
杜银娟
安越里
吕玉红
苏伟
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Shandong Electric Power Engineering Consulting Institute Corp Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/003—Arrangements for measuring or testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/08—Thermal analysis or thermal optimisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Abstract

The invention belongs to the technical field of cogeneration and provides a method and a system for determining the upper and lower limits of the operating power of a single-extraction cogeneration extraction condensing unit. The method comprises the steps of determining an operation condition diagram of the single-extraction cogeneration extraction condensing unit and a unit characteristic equation between the upper and lower limits of the power of the steam turbine and the extraction steam quantity; based on a turbine thermodynamic system circulation function method as a theoretical basis, finding out boundary points of an operation condition diagram of the single extraction heat and power cogeneration extraction condensing unit, determining coefficients of a unit characteristic equation, and obtaining the unit characteristic equation with the determined coefficients; and increasing input working condition points required by the upper and lower power limits, and determining an upper and lower limit model of the turbine power by combining a set characteristic equation for determining the coefficient to obtain the upper and lower limit values of the turbine power so as to realize the distribution of the heat load.

Description

Method and system for determining upper and lower limits of operating power of single-extraction cogeneration extraction condensing unit
Technical Field
The invention belongs to the technical field of cogeneration, and particularly relates to a method and a system for determining an upper limit and a lower limit of operating power of a single-extraction cogeneration extraction condensing unit.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In order to obtain an operation characteristic equation of a heat supply unit, a common method is to adopt variable working condition analysis of a thermal system, namely when the heat and electricity load modes of the heat supply unit change, according to a reference working condition and a variable working condition calculation method of a heat supply turbine, calculating the variable working condition of the thermal system to obtain a working condition diagram of the turbine, and then fitting the calculation result of the variable working condition of the unit by using a multivariate linear regression principle to obtain the operation characteristic equation of the heat supply unit. The calculation steps of the variable working condition of the steam turbine are complex, different thermodynamic systems need to be modeled respectively, and the method is not suitable for a load optimization scheduling algorithm which needs a large amount of exhaustive calculation.
At present, the upper and lower limits of electric power are treated as fixed values in an energy-saving scheduling model of a cogeneration unit, so that the phenomena of overlarge generating power of the cogeneration unit, difficult system peak regulation and serious wind and light abandonment are caused.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a method and a system for determining the upper and lower limits of the operating power of a single-extraction cogeneration extraction and condensation unit, which are used for finding out the operating boundary points of the cogeneration extraction and condensation unit on the basis of analyzing a diagram of the operating conditions of the cogeneration extraction and condensation unit and taking a circulation function method as a theoretical basis, deriving a characteristic equation of the unit according to the boundary points, and determining the upper and lower limits of the operating power of the unit according to the characteristic equation of the unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for determining the upper and lower limits of the operating power of a single heat extraction, heat generation and condensation extraction unit.
The method for determining the upper and lower limits of the operating power of the single heat extraction and cogeneration extraction and condensation unit comprises the following steps:
determining an operation condition diagram of the single-extraction cogeneration extraction condensing unit and a unit characteristic equation between the upper and lower limits of the power of the steam turbine and the extraction steam quantity;
based on a steam turbine thermodynamic system cycle function method as a theoretical basis, finding out boundary points of an operation condition diagram of a single extraction heat and power cogeneration extraction condensing unit, determining coefficients of a unit characteristic equation, and obtaining the unit characteristic equation with the determined coefficients;
and increasing input working condition points required by the upper and lower power limits, and determining an upper and lower limit model of the turbine power by combining a set characteristic equation for determining the coefficient to obtain the upper and lower limit values of the turbine power so as to realize the distribution of the heat load.
Further, a unit characteristic equation between the upper and lower power limits of the steam turbine and the extraction steam quantity is as follows:
Pe1＝k1D0+k2De1+k3
wherein k is1、k2、k3Is a coefficient, Pe1For turbine power, D0As the amount of steam, De1Is the industrial steam extraction amount.
Further, the boundary points of the operation condition diagram of the single-extraction cogeneration extraction and coagulation unit include a minimum heat supply steam inflow non-extraction condition point, a maximum steam inflow one-stage steam extraction as a maximum condition point, a 30-th tha-pure-coagulation condition point, a 50-th tha-pure-coagulation condition point, a 75-th tha-pure-coagulation condition point, and a 100-th tha-pure-coagulation condition point.
Further, according toFitting the minimum heat supply steam admission non-extraction operating point, the maximum steam admission non-extraction operating point, 30% THA pure-condensation operating point, 50% THA pure-condensation operating point, 75% THA pure-condensation operating point and 100% THA pure-condensation operating point to obtain k1And k3A value of (d); according to k1And k3The value of (a) is combined with the maximum steam inlet amount and one-section steam extraction to be the maximum working condition point, and k is obtained2To obtain a unit characteristic equation for determining the coefficients.
Further, the input operating points required for increasing the upper and lower power limits include: the minimum power working point of the industrial steam extraction and the minimum power working point of which the first-stage steam extraction is the maximum value can be started.
Further, when the upper limit model of the turbine power is determined, the upper limit model of the turbine power is obtained by adopting a similar theorem according to the range of the steam extraction amount and based on the operation condition diagram of the single-extraction cogeneration extraction and condensation unit.
Further, when the lower limit model of the power of the steam turbine is determined, the lower limit model of the power of the steam turbine is obtained by adopting a similar theorem based on an operation condition diagram of the single-extraction cogeneration extraction and condensation unit according to the range of the extraction steam amount.
The invention provides a system for determining the upper and lower limits of the operating power of a single heat extraction, heat generation and condensation unit.
The system for determining the upper and lower limits of the operating power of the single heat extraction and cogeneration extraction and condensation unit comprises:
a model determination module configured to: determining an operation condition diagram of the single-extraction cogeneration condensing unit and a unit characteristic equation between the upper and lower limits of the electric power of the thermoelectric unit and the steam extraction amount;
a coefficient determination module configured to: based on a turbine thermodynamic system circulation function method as a theoretical basis, finding out boundary points of an operation condition diagram of the single extraction heat and power cogeneration extraction condensing unit, determining coefficients of a unit characteristic equation, and obtaining the unit characteristic equation with the determined coefficients;
a solving module configured to: and increasing input working condition points required by the upper and lower power limits, and determining a power upper and lower limit model by combining with a unit characteristic equation for determining the coefficient to obtain the power upper and lower limit values so as to realize the distribution of the heat load.
A third aspect of the invention provides a computer-readable storage medium.
A computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the method for determining the upper and lower limits of the operating power of a single extraction co-generation pumping and condensing unit according to the first aspect.
A fourth aspect of the invention provides a computer apparatus.
A computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method for determining the upper and lower limits of the operating power of the single extraction co-generation condensing unit according to the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
on the basis of analyzing a diagram of the operation condition of the cogeneration pumping and condensing single pump unit, the invention finds out the boundary points of the operation of the cogeneration pumping and condensing single pump unit by taking a circulation function method as a theoretical basis, deduces the characteristic equation of the unit according to the boundary points, can quickly and conveniently deduce the characteristic equation of the single pumping coal cogeneration pumping and condensing single pump unit suitable for various different thermodynamic systems, can provide a simple bottom layer algorithm model for energy-saving dispatching of the unit on one hand, and provides a theoretical basis for determining the characteristic equation of the unit in a unit performance test on the other hand, and can save the number of the operation conditions of the field performance test of the cogeneration pumping and condensing single pump unit.
Based on boundary points of unit operation conditions, the invention further deduces the functional relationship between the upper and lower limits of the electric power of the thermoelectric unit and the steam extraction amount, and establishes a novel energy-saving scheduling model which considers the change of the upper and lower limits of the electric power of the coal-fired cogeneration extraction condensing single-pump unit along with the steam extraction amount and can accurately reflect the power generation power of 'fixing power with heat'.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a flowchart of a method for determining an upper and lower limit of operating power of a single extraction cogeneration condensing unit according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the operation condition of a first-type single-extraction cogeneration condensing unit according to a first embodiment of the present invention;
FIG. 3 is a diagram illustrating a second type of single extraction heat, power and condensation unit according to a first embodiment of the present invention;
fig. 4 (a) is a diagram illustrating a variation process of an electric power upper limit of a single-pump unit according to an embodiment of the present invention;
FIG. 4 (b) is a view taken along the vertical line of FIG. 4 (a) illustrating an embodiment of the present invention;
fig. 5 (a) is a diagram illustrating a variation process of a lower power limit of a single-pump group according to an embodiment of the present invention;
FIG. 5 (b) is a view taken along the vertical line in FIG. 5 (a) in a first state shown in the first embodiment of the present invention;
FIG. 5 (c) is a view taken along the vertical line in FIG. 5 (a) showing a second condition of the embodiment of the present invention;
fig. 6 (a) is a diagram illustrating a variation process of the upper limit of the electric power of the single-pump unit according to the first embodiment of the present invention;
FIG. 6 (b) is a view taken along the vertical line of FIG. 6 (a) illustrating an embodiment of the present invention;
fig. 7 (a) is a diagram illustrating a variation process of a lower power limit of a single-pump group according to an embodiment of the present invention;
FIG. 7 (b) is a view taken along the vertical line of FIG. 7 (a) in a first state shown in the embodiment of the present invention;
FIG. 7 (c) is a view taken along the vertical line in FIG. 7 (a) showing a second condition of the embodiment of the present invention;
fig. 8 is a peak shaving capacity curve diagram corresponding to different extraction steam units according to the first embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It is noted that the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of methods and systems according to various embodiments of the present disclosure. It should be noted that each block in the flowchart or block diagrams may represent a module, a segment, or a portion of code, which may comprise one or more executable instructions for implementing the logical function specified in the respective embodiment. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Example one
As shown in fig. 1, the embodiment provides a method for determining an upper and lower limit of operating power of a single extraction cogeneration extraction and condensation unit, and the embodiment is illustrated by applying the method to a server, and it can be understood that the method can also be applied to a terminal, and can also be applied to a system including the terminal and the server, and is implemented by interaction between the terminal and the server. The server may be an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, or a cloud server providing basic cloud computing services such as a cloud service, a cloud database, cloud computing, a cloud function, cloud storage, a network server, cloud communication, middleware service, a domain name service, a security service CDN, a big data and artificial intelligence platform, and the like. The terminal may be, but is not limited to, a smart phone, a tablet computer, a laptop computer, a desktop computer, a smart speaker, a smart watch, and the like. The terminal and the server may be directly or indirectly connected through wired or wireless communication, and the application is not limited herein. In this embodiment, the method includes the steps of:
determining an operation condition diagram of the single-extraction cogeneration extraction condensing unit and a unit characteristic equation between the upper and lower limits of the power of the steam turbine and the extraction steam amount;
based on a steam turbine thermodynamic system cycle function method as a theoretical basis, finding out boundary points of an operation condition diagram of a single extraction heat and power cogeneration extraction condensing unit, determining coefficients of a unit characteristic equation, and obtaining the unit characteristic equation with the determined coefficients;
and increasing input working condition points required by the upper and lower power limits, and determining an upper and lower limit model of the turbine power by combining a set characteristic equation for determining the coefficient to obtain the upper and lower limit values of the turbine power so as to realize the distribution of the heat load.
The specific scheme of the embodiment can be realized by referring to the following contents:
in the embodiment, the operation condition diagram of the single pumping unit is analyzed, and the operation condition diagram of the single pumping cogeneration pumping condensing unit is simplified into the following two types:
type one, as shown in fig. 2, in the figure, point a is a working condition where the minimum power of the industrial steam extraction can be started (maximum extraction of 1 stage), point b is a working condition where the minimum power of the industrial steam extraction can be started and the steam extraction is not performed (extraction of 1 stage is 0), point c is a working condition where the maximum steam inflow is not performed (extraction of 1 stage is 0) (TMCR working condition), point d is a working condition where the extraction of 1 section of the maximum steam inflow is the maximum, and point e is a working condition where the extraction of 1 section of the maximum is the minimum power.
Type two, as shown in fig. 3, in the figure, point a is the working condition of minimum power (maximum extraction of 1 stage) of the operable industrial steam extraction, point b is the working condition of minimum power (extraction of 0 stage 1) of the operable industrial steam extraction, point c is the working condition of maximum steam inflow and no steam extraction (extraction of 0 stage 1), point d is the working condition of maximum steam inflow and extraction of 1 stage, and point e is the working condition of minimum power of the extraction of 1 stage.
The operation condition diagram is drawn according to the results of a large number of heat balance calculations under various conditions, the actual diagram is a group of approximate parallel lines, and the power P of the steam turbine is known according to the principle of a cyclic function methode1Steam amount D0Industrial extraction volume De1The expression between is:
Pe1＝k1D0+k2De1+k3
the numerical values of k1, k2 and k3 are solved, the power characteristic equation of the unit is obtained, and the turbine power P can be conveniently solvede1Steam amount D0Industrial extraction volume De1The relation between the three components greatly saves the calculation workload, and provides a simple and easy-to-use bottom layer calculation equation for economic and technical comparison and load optimization distribution among a plurality of units.
In order to more accurately obtain the coefficients k1, k2 and k3 of the characteristic equation, the operation boundary values of the unit are selected for derivation, and the calculation boundary values which need to be input are shown in table 1:
TABLE 1 calculated boundary values to be entered
Figure BDA0003753167770000081
Figure BDA0003753167770000091
The method of deriving the plant characteristic equation first determines coefficients k1 and k3 by fitting 6 points of c-point, 100-th-tha, 75-th-tha, 50-th-tha, 30-th-tha, and b-point. Then, the coefficient k2 is obtained from the point d.
To implement the solution of the present embodiment, the following is exemplified:
TABLE 2 raw input data of a 350MW condensing unit
Figure BDA0003753167770000092
Figure BDA0003753167770000101
The original input data of a certain 350MW extraction condensing unit is shown in table 2, and the known expressions among the power Pe1 of the steam turbine, the steam volume D0 and the industrial extraction volume De1 are as follows:
Pe1＝k1D0+k2De1+k3
fitting six working condition points with the steam extraction amount of 0 into a straight line, wherein the expression is as follows:
Pe1＝0.3292D0+9.3681
it is thus possible to obtain:
k1＝0.3292
k3＝9.3681
substituting the point d of the maximum heating and air extracting working condition into a general expression to obtain:
310.681＝k1×1166.8+k2×500+9.3681
k2＝-0.1655
therefore, the expression among the turbine power Pe1, the steam amount D0, and the industrial extraction steam amount De1 is:
Pe1＝0.3292D0-0.1655De1+9.3681
table 3 computational verification
Verification of operating conditions De1 D0 Pel Standard value Relative error
Rated extraction 1 170 1164.2 364.4715 366.48 -0.55％
Rated extraction 2 50 562 186.0987 180.577 3.06％
THA
0 1081.3 365.3321 365.034 0.08％
50％THA 0 514.9 178.8732 182.536 -2.01％
75％THA 0 784.5 267.6255 273.768 -2.24％
As shown in Table 3, the derived characteristic equation is adopted for calculation and verification, the relative error is small, and the engineering application requirements are met.
As shown in Table 4, the electric power upper and lower limit equations of the unit are solved as follows.
TABLE 4 calculation of input operating points for which the upper and lower power limits need to be increased
Figure BDA0003753167770000111
(1) Electric power upper limit solution method derivation
When D is reached as shown in FIGS. 4 (a) and 4 (b)e1min≤De1≤De1maxThen, according to the similar theorem:
Figure BDA0003753167770000112
substituting according to known conditions to obtain:
Figure BDA0003753167770000113
Figure BDA0003753167770000114
TABLE 5 Unit Power Upper Limit model
Figure BDA0003753167770000115
Figure BDA0003753167770000121
And constructing a unit power upper limit model according to the calculated electric power upper limit, wherein the unit power upper limit model is shown in a table 5.
(2) Derivation of electric power lower limit solving method
As shown in fig. 5 (a), the extraction amount is from 0 to Delmax, and the lower limit of the unit power is from b to a to e, so that the lower limit of the unit power needs to be calculated in two stages from b to a and a to e.
(1) When D is more than or equal to 0e1≤De1.aThen, according to the similar theorem:
Figure BDA0003753167770000122
as shown in fig. 5 (b), the following are substituted according to known conditions:
Figure BDA0003753167770000123
Figure BDA0003753167770000124
(2) when D is presente1.a≤De1≤De1maxThen, according to the similar theorem:
Figure BDA0003753167770000125
as shown in fig. 5 (c), the following are substituted according to known conditions:
Figure BDA0003753167770000126
Figure BDA0003753167770000127
table 6 unit power lower limit model:
Figure BDA0003753167770000128
Figure BDA0003753167770000131
and constructing a unit power lower limit model according to the calculated electric power lower limit, as shown in table 6.
TABLE 7 calculation of upper and lower limits of electric power for single-pump unit
Figure BDA0003753167770000132
Figure BDA0003753167770000141
In order to implement the solution of the present embodiment, the calculation of the upper and lower limits of the electric power of the single-pump unit is described as shown in table 7.
(1) An example of the electric power upper limit solution is shown in fig. 6 (a) and 6 (b).
When D is presente1min≤De1≤De1maxAccording to a similar theorem:
Figure BDA0003753167770000142
substituting according to known conditions to obtain:
Figure BDA0003753167770000143
Figure BDA0003753167770000144
substituting to obtain:
Pe1max＝-0.256De1+370.6(0≤De1≤160)
(2) The lower limit of electric power is solved as shown in FIG. 7 (a), FIG. 7 (b), and FIG. 7 (c)
(1) When D is more than or equal to 0e1≤De1.aAnd then, substituting data to obtain:
Pe1min＝a1＝b1＝105
(2) when D is presente1.a≤De1≤De1maxThen, according to the similar theorem:
Figure BDA0003753167770000145
substituting according to known conditions to obtain:
Figure BDA0003753167770000146
Figure BDA0003753167770000147
substituting data to obtain:
Pe1min＝0.876De1+61.2
TABLE 8 equation of upper and lower power limits
Figure BDA0003753167770000151
The final resulting upper and lower power limits equation is shown in table 8. And drawing a relation graph (figure 8) of the upper limit and the lower limit of the power of the unit corresponding to different heat supply quantities of the unit according to the upper limit and the lower limit of the power equation.
Example two
The embodiment provides a system for determining the upper and lower limits of the operating power of a single-extraction cogeneration pumping and condensing unit.
The system for determining the upper and lower limits of the operating power of the single-extraction cogeneration extraction and condensation unit comprises:
a model determination module configured to: determining an operation condition diagram of the single-extraction cogeneration extraction condensing unit and a unit characteristic equation between the upper limit and the lower limit of the electric power of the thermoelectric unit and the extraction steam quantity;
a coefficient determination module configured to: based on a turbine thermodynamic system circulation function method as a theoretical basis, finding out boundary points of an operation condition diagram of the single extraction heat and power cogeneration extraction condensing unit, determining coefficients of a unit characteristic equation, and obtaining the unit characteristic equation with the determined coefficients;
a solving module configured to: and (3) increasing input working condition points required by the upper and lower power limits, and determining a power upper and lower limit model by combining a unit characteristic equation for determining the coefficient to obtain the upper and lower power limits so as to realize the distribution of the heat load.
It should be noted here that the model determining module, the coefficient determining module and the solving module are the same as those of the example and the application scenario realized by the steps in the first embodiment, but are not limited to the disclosure of the first embodiment. It should be noted that the modules described above as part of a system may be implemented in a computer system such as a set of computer-executable instructions.
EXAMPLE III
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, where the program, when executed by a processor, implements the steps in the method for determining the upper and lower limits of the operating power of the single extraction cogeneration pumping and condensing unit as described in the first embodiment above.
Example four
The embodiment provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the program, the processor implements the steps in the method for determining the upper and lower limits of the operating power of the single extraction co-generation pumping and condensing unit according to the first embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention 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, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The method for determining the upper and lower limits of the operating power of the single heat extraction and cogeneration extraction and condensation unit is characterized by comprising the following steps of:
determining an operation condition diagram of the single-extraction cogeneration extraction condensing unit and a unit characteristic equation between the upper and lower limits of the power of the steam turbine and the extraction steam quantity;
based on a turbine thermodynamic system circulation function method as a theoretical basis, finding out boundary points of an operation condition diagram of the single extraction heat and power cogeneration extraction condensing unit, determining coefficients of a unit characteristic equation, and obtaining the unit characteristic equation with the determined coefficients;
and increasing input working condition points required by the upper and lower power limits, and determining an upper and lower limit model of the turbine power by combining a set characteristic equation for determining the coefficient to obtain the upper and lower limit values of the turbine power so as to realize the distribution of the heat load.
2. The method for determining the upper and lower limits of the operating power of the single heat extraction, cogeneration, extraction and condensation unit according to claim 1, wherein the unit characteristic equation between the upper and lower limits of the turbine power and the extraction steam amount is as follows:
Pe1＝k1D0+k2De1+k3
wherein k is1、k2、k3Is a coefficient, Pe1For turbine power, D0As the amount of steam, De1Is the industrial steam extraction amount.
3. The method for determining the upper and lower limits of the operating power of the single extraction cogeneration extraction and coagulation unit according to claim 1, wherein the boundary points of the operating condition map of the single extraction cogeneration extraction and coagulation unit include a minimum heating steam admission non-extraction operating point, a maximum steam admission one-stage steam extraction to a maximum operating point, a 30% -tha straight-line operating point, a 50% -tha straight-line operating point, a 75% -tha straight-line operating point and a 100% -tha straight-line operating point.
4. The method for determining upper and lower limits of operating power of a single-extraction cogeneration, condensing unit according to claim 3, wherein the fitting is performed based on a minimum-heat-supply-steam-intake-amount non-extraction operating point, a maximum-steam-intake-amount non-extraction operating point, 30%1And k3A value of (d); according to k1And k3The value of (a) is combined with the maximum steam inlet amount and one-section steam extraction to be the maximum working condition point, and k is obtained2To obtain a unit characteristic equation for determining the coefficients.
5. The method for determining the upper and lower limits of the operating power of the single heat extraction, cogeneration, pumping and condensing unit according to claim 1, wherein the input operating points required for increasing the upper and lower limits of the power comprise: the minimum power working point of the industrial steam extraction and the minimum power working point of the section of steam extraction with the maximum value can be used.
6. The method for determining the upper and lower limits of the operating power of the single extraction cogeneration extraction and condensation unit according to claim 1, wherein when the upper limit model of the turbine power is determined, the upper limit model of the turbine power is obtained by adopting a similarity theorem according to the range of the extraction steam based on the operating condition diagram of the single extraction cogeneration extraction and condensation unit.
7. The method for determining the upper limit and the lower limit of the operating power of the single extraction cogeneration extraction and condensation unit according to claim 1, wherein when the lower limit model of the turbine power is determined, the lower limit model of the turbine power is obtained by adopting a similar theorem according to the range of the extraction steam based on the operating condition diagram of the single extraction cogeneration extraction and condensation unit.
8. Single heat extraction cogeneration extraction condensing unit operating power upper and lower limit determination system, its characterized in that includes:
a model determination module configured to: determining an operation condition diagram of the single-extraction cogeneration condensing unit and a unit characteristic equation between the upper and lower limits of the electric power of the thermoelectric unit and the steam extraction amount;
a coefficient determination module configured to: based on a steam turbine thermodynamic system cycle function method as a theoretical basis, finding out boundary points of an operation condition diagram of a single extraction heat and power cogeneration extraction condensing unit, determining coefficients of a unit characteristic equation, and obtaining the unit characteristic equation with the determined coefficients;
a solving module configured to: and increasing input working condition points required by the upper and lower power limits, and determining a power upper and lower limit model by combining with a unit characteristic equation for determining the coefficient to obtain the power upper and lower limit values so as to realize the distribution of the heat load.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for determining the upper and lower limits of the operating power of a cogeneration pumping and condensing unit according to any one of claims 1 to 7.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method for determining the upper and lower limits of the operating power of a single co-generation pumping and condensing unit according to any one of claims 1 to 7.
CN202210855001.9A 2022-07-19 2022-07-19 Method and system for determining upper and lower limits of operating power of single-extraction cogeneration extraction condensing unit Pending CN115263467A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117829558A (en) * 2024-03-06 2024-04-05 天津迪比爱新能源科技有限公司 Adjustment method of cogeneration unit under peak regulation operation
CN117829558B (en) * 2024-03-06 2024-05-10 天津迪比爱新能源科技有限公司 Adjustment method of cogeneration unit under peak regulation operation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117829558A (en) * 2024-03-06 2024-04-05 天津迪比爱新能源科技有限公司 Adjustment method of cogeneration unit under peak regulation operation
CN117829558B (en) * 2024-03-06 2024-05-10 天津迪比爱新能源科技有限公司 Adjustment method of cogeneration unit under peak regulation operation

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