Derivation method of characteristic equation and power operation limit of combined cycle single extraction heat supply unit

Abstract

The application provides a combined cycle single-extraction heat supply unit characteristic equation and power operation limit derivation method, obtains a gas turbine temperature correction coefficient, a gas turbine intake amount and a steam turbine extraction amount; obtains combined cycle power according to a first coefficient, a second coefficient and a third coefficient in a steam turbine power expression, a fourth coefficient, a fifth coefficient, a sixth coefficient, a seventh coefficient and an eighth coefficient in a gas turbine power expression and the gas turbine temperature correction coefficient; the application saves the number of field performance test working conditions of a gas-steam combined cycle single-extraction heat and power cogeneration unit, and is beneficial to relieving the phenomenon of excessive power generation of a heat and power unit, heat and power unit peak regulation difficulty and wind and light abandonment in grid peak regulation.

Description

Technical Field

[0001] This invention relates to the field of combined cycle single-extraction heating units, and in particular to a method for deriving characteristic equations and power operating limits for combined cycle single-extraction heating units. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Gas-fired steam cogeneration power plants are designed to operate in a combination of gas turbine and steam turbine, meaning that the electrical load has two forms: gas turbine electrical load and steam turbine electrical load. The thermal load is generated by the intermediate extraction of steam from the steam turbine. Therefore, the relationship between thermal load and electrical load is more complex than that of conventional coal-fired units.

[0004] To obtain the operating characteristic equations of combined cycle single-extraction heating units, a variable operating condition analysis of the thermal system is typically employed. This involves calculating the operating condition diagram of the combined cycle unit based on the baseline operating condition and the variable operating condition calculations of the combined cycle unit's thermal system. The results are then fitted using multiple linear regression. However, the variable operating condition calculation steps for combined cycle units are more complex than those for coal-fired units, requiring separate modeling for different gas turbines and steam turbines. This makes them unsuitable for load optimization and scheduling algorithms that require extensive exhaustive calculations. Furthermore, current energy-saving scheduling models for combined heat and power units often use the upper and lower limits of single-unit output for electrical and thermal loads, treating them as fixed values. This leads to excessive power generation by combined cycle units, difficulties in system peak shaving, and consequently, severe wind and solar power curtailment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for deriving characteristic equations and power operating limits for combined cycle single-extraction cogeneration units. Based on an analysis of the operating conditions of coal-fired single-extraction condensing cogeneration units, and using the cyclic function method as a theoretical foundation, the boundary points of the single-extraction steam turbine unit are identified, and the characteristic equations of the steam turbine unit are derived from these boundary points. Then, using the main steam flow rate of the steam turbine as an intermediate quantity, the operating characteristic equations of the gas turbine are derived. Finally, the relationship between the combined cycle unit's electrical power and the gas turbine's intake air volume and the steam turbine's heating extraction steam volume is derived. The characteristic equations described in this invention provide a simple underlying algorithm model for energy-saving unit scheduling and a theoretical basis for determining the unit's characteristic equations in performance tests, thus reducing the number of on-site performance test conditions required for gas-steam combined cycle single-extraction cogeneration units.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of this invention provides a method for deriving the characteristic equations of a combined cycle single-extraction heating unit.

[0008] A method for deriving the characteristic equations of a combined cycle single-extraction heating unit includes the following steps:

[0009] Obtain the gas turbine temperature correction coefficient, gas turbine air intake, and steam turbine extraction steam rate;

[0010] The combined cycle power is obtained by using the first, second, and third coefficients in the steam turbine power expression, the fourth, fifth, sixth, seventh, and eighth coefficients in the gas turbine power expression, and the gas turbine temperature correction coefficient.

[0011] Furthermore, the expression for steam turbine power is:

[0012] P e1汽机 =k1D1+k2D e1 +k3

[0013] Where k1 is the first coefficient, k2 is the second coefficient, k3 is the third coefficient, D1 is the high-pressure main steam flow rate, and D... e1 This refers to the steam extraction rate of the steam turbine.

[0014] Furthermore, the power expression for a gas turbine is:

[0015] P e1燃机 =k4D1 2 +k5D1+k6;

[0016] P e1燃机 =k7D rq +k8

[0017] Where k4 is the fourth coefficient, k5 is the fifth coefficient, k6 is the sixth coefficient, k7 is the seventh coefficient, k8 is the eighth coefficient, D1 is the high-pressure main steam flow rate, and D... rq This refers to gas consumption.

[0018] Furthermore, the temperature correction factor for the gas turbine is:

[0019] η=k9t 2 +k 10 t+k 11

[0020] Where t is the temperature before correction, k9 is the ninth coefficient, and k 10 k is the tenth coefficient. 11 It is the eleventh coefficient.

[0021] Furthermore, the combined cycle power is:

[0022]

[0023] Where k1 is the first coefficient, k2 is the second coefficient, k3 is the third coefficient, D1 is the high-pressure main steam flow rate, and D... e1 The steam turbine extraction rate is represented by k4, k5, k6, k7, k8, and D1, where k1 is the high-pressure main steam flow rate. rq This refers to gas consumption.

[0024] The second aspect of this invention provides a method for deriving the power operating limit of a combined cycle single-extraction heating unit.

[0025] A method for deriving power operating limits of a combined-cycle single-extraction heating unit, utilizing the method for deriving the characteristic equations of a combined-cycle single-extraction heating unit as described in the first aspect of this invention, includes:

[0026] When D e1min <D e1 <D e1.a D1 is a constant, and is D 1.b ,but:

[0027]

[0028] Furthermore, when D e1.a <D e1 <D e1max D1 and P e1 Satisfying D1 = cP e1总 +d, then:

[0029]

[0030]

[0031] Furthermore, when D e1min <De1<D e1.a Time: D 1min =D 1.a ;

[0032] When D e1.a <D e1 <D e1max D1 and P e1 Satisfying D1=aP e1汽机 +b, then:

[0033]

[0034] D 1max =D 1.d .

[0035] The third aspect of this invention provides a system for deriving characteristic equations for a combined cycle single-extraction heating unit.

[0036] A system for deriving characteristic equations for a combined cycle single-extraction heating unit includes:

[0037] The data acquisition module is configured to acquire the gas turbine temperature correction coefficient, gas turbine intake air volume, and steam turbine extraction steam volume.

[0038] The characteristic equation derivation module is configured to obtain the combined cycle power based on the first, second, and third coefficients in the steam turbine power expression, the fourth, fifth, sixth, seventh, and eighth coefficients in the gas turbine power expression, and the gas turbine temperature correction coefficient.

[0039] The fourth aspect of the present invention provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps in the method for deriving the characteristic equation of a combined-cycle single-extraction heating unit as described in the first aspect of the present invention or the method for deriving the power operating limit of a combined-cycle single-extraction heating unit as described in the second aspect of the present invention.

[0040] The fifth aspect of the present invention provides an electronic device, including a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps in the method for deriving the characteristic equation of a combined cycle single-extraction heating unit or the method for deriving the power operating limit of a combined cycle single-extraction heating unit as described in the first aspect of the present invention.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] 1. This invention relates to a method for deriving characteristic equations and power operating limits for combined cycle single-extraction cogeneration units. Based on the analysis of the operating conditions of coal-fired single-extraction cogeneration units, and using the cyclic function method as the theoretical basis, the boundary points of the single-extraction steam turbine unit are identified, and the characteristic equations of the steam turbine unit are derived based on these boundary points. Then, using the main steam flow rate of the steam turbine as an intermediate quantity, the operating characteristic equations of the gas turbine are derived. Finally, the relationship between the combined cycle unit's electrical power and the gas turbine's intake air volume and the steam turbine's heating extraction steam volume is derived. The characteristic equations can provide a simple underlying algorithm model for energy-saving scheduling of the unit, and also provide a theoretical basis for determining the unit's characteristic equations in performance tests, thus saving the number of on-site performance test conditions for gas-steam combined cycle single-extraction cogeneration units.

[0043] 2. The present invention provides a method for deriving the characteristic equation and power operation limit of a combined cycle single-extraction cogeneration unit. Based on the boundary points of the unit's operating conditions, it further derives the functional relationship between the upper and lower limits of the electrical power of the gas-steam combined cycle cogeneration unit and the amount of extracted steam. This method can accurately reflect the new energy-saving dispatch model of the gas-steam combined cycle single-extraction unit's "heat-determined power generation" model, which is beneficial to alleviating the problems of excessive power generation of cogeneration units, difficulties in peak shaving of cogeneration units, and wind and solar power curtailment in grid peak shaving dispatch.

[0044] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0045] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0046] Figure 1 This is a schematic diagram showing the relationship between the total power and the extraction volume of the combined cycle single-extraction cogeneration unit provided in Embodiment 1 of the present invention.

[0047] Figure 2 This is a simplified structural schematic diagram of the operating conditions of a single-extraction cogeneration condensing unit provided in Embodiment 1 of the present invention.

[0048] Figure 3 This is a schematic diagram showing the relationship between the main steam flow rate and the turbine power of a gas-steam combined cycle unit provided in Embodiment 1 of the present invention.

[0049] Figure 4 This is a schematic diagram of the adjustable total power range under different pumping volumes provided in Embodiment 1 of the present invention.

[0050] Figure 5 This is a schematic diagram showing the main steam flow range under different extraction rates provided in Embodiment 1 of the present invention.

[0051] Figure 6 This is a schematic diagram of the peak-shaving capacity curves of units with different extraction volumes provided in Embodiment 1 of the present invention. Detailed Implementation

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0053] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, 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 pertains.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0056] Example 1:

[0057] Embodiment 1 of the present invention provides a method for deriving the characteristic equations and power operating limits of a combined cycle single-extraction heating unit. The method for deriving the characteristic equations includes the following steps:

[0058] Obtain the gas turbine temperature correction coefficient, gas turbine air intake, and steam turbine extraction steam rate;

[0059] The combined cycle power is obtained by using the first, second, and third coefficients in the steam turbine power expression, the fourth, fifth, sixth, seventh, and eighth coefficients in the gas turbine power expression, and the gas turbine temperature correction coefficient.

[0060] In this embodiment, the terminology is explained as follows:

[0061] Steam turbine operating characteristic equation: the relationship between the electric power of a combined cycle steam turbine and the intake and extraction steam rates of a gas turbine;

[0062] Gas turbine operating characteristic equations: the relationship between gas turbine electrical power and steam turbine inlet steam rate, and between gas turbine electrical power and gas turbine inlet air rate;

[0063] Combined cycle unit operating characteristic equations: the relationship between total combined cycle power and gas turbine intake air volume and steam turbine heating extraction steam volume;

[0064] Combined cycle unit operating condition diagram: Operating condition diagram of a combined cycle unit with regulating steam extraction.

[0065] Specifically, the method includes the following processes:

[0066] S1: Typical heat balance parameters of a combined cycle single-extraction cogeneration unit

[0067] like Figure 1 As shown in the table below, taking a 9F-class combined cycle unit as an example, the typical heat balance parameters for pure condensing and extraction condensing are as follows:

[0068]

[0069] S2: Characteristic equation of steam turbine

[0070] By analyzing the operating condition diagrams of single-extraction steam turbine units, the operating condition diagrams of single-extraction cogeneration extraction condensing units are simplified. Figure 2 As shown.

[0071] Point a represents the minimum extraction power of the turbine (maximum extraction of 1 stage steam), point b represents the minimum extraction power of the turbine without extraction (0 for 1 stage steam extraction), point c represents the maximum steam intake without extraction (0 for 1 stage steam extraction), and point d represents the maximum steam intake and 1st stage steam extraction at its maximum value.

[0072] The operating condition diagram is drawn based on the results of numerous heat balance calculations under various operating conditions. The actual graph is a set of approximately parallel lines. According to the principle of the cyclic function method, the steam turbine power P is known. e1 High-pressure main steam flow rate D1 and steam turbine extraction steam rate D e1 The expression between them is:

[0073] P e1汽机 =k1D1+k2D e1 +k3

[0074] Once the values ​​of k1, k2, and k3 are determined, the dynamic characteristic equation of the steam turbine is obtained, and the power P of the steam turbine can be easily calculated. e1 Steam quantity D1, Steam extraction quantity D e1 The relationship between the three.

[0075] (1) Derivation method

[0076]

[0077] (2) Calculation Example

[0078]

[0079] As can be seen, by fitting the data to three points, the coefficients k1, k2, and k3 can be obtained, thus yielding the characteristic equations of the steam turbine:

[0080] P e1汽机 =0.6126D1-0.2056D e1 -21.52.

[0081] S3: Gas turbine characteristic equation

[0082] Steam turbine heating steam extraction rate D e1 The change only affects the steam cycle of the steam turbine, and has no effect on the top cycle of the gas turbine. Based on the principle of the cycle function method, the gas turbine power P is known. e1High-pressure main steam flow rate D1 and gas turbine power P e1 Gas consumption D rq The expression between them is:

[0083] P e1燃机 =k4D1 2 +k5D1+k6

[0084] P e1燃机 =k7D rq +k8.

[0085] (1) Derivation method

[0086]

[0087] (2) Calculation Example

[0088]

[0089] By fitting the data under four different load conditions, the coefficients k4, k5, k6, k7, and k8 can be obtained, thus yielding the gas turbine characteristic equations:

[0090] P e1燃机 = -0.0014D1 2 +1.2901D1+24.69

[0091] P e1燃机 =0.1449D rq +10.67.

[0092] (3) Gas turbine temperature correction

[0093] Temperature correction applies only to gas turbines. It is known that under the same gas turbine load, different ambient temperatures result in different actual gas turbine power P. ela For a gas turbine, taking one of the temperatures as a reference temperature, the corresponding actual power P of the gas turbine is... ela With the gas turbine as the reference power, and the corresponding gas turbine power temperature correction factor η = 1, the expression for solving the ambient temperature correction factor η for other gas turbine power is:

[0094]

[0095]

[0096] S4: Characteristic Equations for Gas-Steam Combined Cycle Units

[0097] In a gas-steam combined cycle unit, the combined cycle power P e1总 =P el燃机 +P e1汽机 By integrating the characteristic equations of gas turbines and steam turbines, the characteristic equations of combined cycle units can be obtained.

[0098] (1) Derivation method

[0099]

[0100] Combined cycle power P e1总 =P el燃机 +P e1汽机 However, the power output of the gas turbine needs to be adjusted, so P e1总 =P ela燃机 +P e1汽机 It is necessary to derive the total power P. e1 Gas turbine intake air volume D rq Steam turbine extraction steam volume D e1 The relationship is known as follows:

[0101] P e1汽机 =k1D1+k2D e1 +k3

[0102] P e1燃机 =P e1a燃机基准值 =k7D rq +k8, P e1a燃机 =ηP e1a燃机基准值

[0103] P e1总 =P e1汽机 +ηP e1a燃机基准值 =k1D1+k2D e1 +k3+η(k7D rq +k8)

[0104] D1 can be accessed via P e1燃机 =P e1a燃机基准值 =k4D1 2 The expression +k5D1+k6 is obtained as shown below. The axis of symmetry in the expression is calculated as follows. If the maximum D1 is less than In the following formula, ± is -, and vice versa is +:

[0105]

[0106] In the expression D1, P e1燃机 It can also be done through P e1燃机 =P e1a燃机基准值 =k7D rq +k8 is used as a substitute, and the ± in the expression of D1 depends on the actual situation.

[0107] Therefore, the total power P can be obtained. e1 Gas turbine intake air volume D rq Steam turbine extraction steam volume D e1 Relationship:

[0108]

[0109] Simplifying, we get:

[0110]

[0111] Where η=k9t 2 +k 10 t+k 11 t represents temperature, in °C.

[0112] (2) Calculation Example

[0113]

[0114]

[0115] Combined cycle power P e1总 =P ela燃机 +P e1汽机 Given:

[0116] P e1汽机 =0.6126D1-0.2056D e1 -21.52

[0117] P e1燃机 =P e1a燃机基准值 =0.1449D rq +10.67, P e1燃机 =P e1a燃机基准

[0118] P e1总 =P e1汽机 +ηP e1a燃机基准值 =0.6126D1-0.2056D e1 +0.1449D rq -10.85

[0119] D1 can be accessed via P e1燃机 =P e1a燃机基准值 = -0.0014D1 2 The expression +1.2901D1+24.69 is obtained. Since the axis of symmetry in the expression is... Greater than the maximum D 1.d 300.2t / h, therefore -, so D1 is calculated:

[0120]

[0121] In the expression D1, P e1燃机 It can also be done through P e1燃机 =P e1a燃机基准值 =0.1449D rq+10.67 replacement.

[0122] Therefore, the total power P can be obtained. e1 Gas turbine intake air volume D rq Steam turbine extraction steam volume D e1 Relationship:

[0123]

[0124] S5: Solving for the upper and lower limits of electrical power of gas-steam combined cycle units

[0125] like Figure 3 As shown, since the operating condition diagram of the gas-steam combined cycle unit is similar to that of the steam turbine, P is calculated by referring to the steam turbine operating condition diagram. e1总 With D e1 Restriction relationship and D e1 The constraint relationship between D1 and D2.

[0126] S5.1: P e1总 With D e1 Solving the constraint relationship

[0127] (1) Derivation method

[0128]

[0129]

[0130] from Figure 3 As seen in the diagram, point a represents the lower limit of the total power P. e1总min The turning point is D, so in order to calculate the upper and lower limits below, we first need to know D. e1.a The size, given the x and y coordinates of point a P e1汽机.a D 1.a It can be obtained through the following formula:

[0131] P e1汽机 =k1D1+k2D e1 +k3

[0132] Right now:

[0133]

[0134] 1) Lower limit calculation

[0135] ①When D e1min <D e1 <D e1.a D1 is a constant, and is D 1.b Since the following formula is satisfied:

[0136] P e1总 =k1D1+k2D e1 +k3+ηk4D12 +ηk5D1+ηk6

[0137] Substituting the values, we get:

[0138]

[0139] Simplifying, we get:

[0140]

[0141] ②When D e1.a <D e1 <D e1max D1 and P e1 The equation of line ad is satisfied, and D1 = cP. e1总 +d, because it satisfies the following formula:

[0142] P e1总 =k1D1+k2D e1 +k3+ηk4D1 2 +ηk5D1+ηk6

[0143] Substituting the values, we get:

[0144] P e1总min =k1(c×P e1总min +d)+k2D e1 +k3+ηk4(c×P e1总min +d) 2 +ηk5(c×P e1总min Simplifying +d)+ηk6, we get:

[0145]

[0146] The axis of symmetry in the calculation expression is If the maximum total power P on the straight line ad is e1总.d Less than In the following formula, ± is +, and conversely, -:

[0147] but:

[0148]

[0149] 2) Upper limit calculation

[0150] In the calculation of the upper limit, since there is no turning point, there is only one case.

[0151] When D e1min <D e1 <D e1max D1 is a constant, and is D 1.d Since the following formula is satisfied:

[0152] Pe1总 =k1D1+k2D e1 +k3+ηk4D1 2 +ηk5D1+ηk6

[0153] Substituting the values, we get:

[0154]

[0155] Simplifying, we get:

[0156]

[0157] In summary, P e1总 With D e1 The restrictive relationship between them is:

[0158]

[0159]

[0160] (2) Calculation Example

[0161]

[0162]

[0163] Point a is the lower limit of total power P. e1总min The turning point is D, so in order to calculate the upper and lower limits below, we first need to know D. e1.a The size, given the x and y coordinates of point a P e1汽机.a and D 1.a ,available:

[0164] D e1.a =124.21

[0165] Since the data used in the example is at the reference temperature, η = 1; therefore, by supplementing the table, we obtain:

[0166]

[0167] 1) Lower limit

[0168] ①When D e1min <D e1 ≤De1.a, i.e. 0 <D e1 When ≤124.21, D1 is a constant value of 141t / h, from which we can obtain:

[0169] P e1总min = -0.2056D e1 +243.62

[0170] ②When D e1.a <D e1<D e1max That is, 124.21 <D e1 When <315, D1 and P e1 The equation of line ad satisfies the following condition.

[0171] D1 = 0.9628P e1总 From -68.97, we can obtain the axis of symmetry in the calculation expression as... P e1总.d Since 383.42 is less than 392.16, a plus sign is applied, resulting in:

[0172]

[0173] 2) Upper limit calculation

[0174] When 0 <D e1 <D e1max That is, 0 <D e1 When <315, D1 is a constant value of 300.2 t / h, from which we can obtain:

[0175] P e1总max = -0.2056D e1 +448.2

[0176] In summary, P e1总 With D e1 The restrictive relationship between them is:

[0177]

[0178] 3) The constraint relationship between Pe1 and De1.

[0179] <![CDATA[D e1 ]]> <![CDATA[P e1总min ]]> <![CDATA[D e1 ]]> <![CDATA[P e1总max ]]> Point b 0 243.62 Point C <![CDATA[D e1.a =D e1.b =0]]> 448.19 Point A 124.21 218.08 point d 315 383.43 Take any point within the range 180 245.65 Take any point within the range 250 290.30 point d 315 383.43

[0180] A schematic diagram of the adjustable total power range under different pumping volumes is shown below. Figure 4 As shown.

[0181] S5.2: Solving the constraint relationship between De1 and D1

[0182] (1) Derivation method

[0183]

[0184]

[0185] 1) Lower limit calculation

[0186] As seen in the graph, point D represents the lower limit of the high-pressure main steam flow rate. e1min The turning point is D, so in order to calculate the upper and lower limits below, we first need to know D. e1.a The size, given the x and y coordinates of point a P e1汽机.a D1.a It can be obtained through the following formula:

[0187] P e1汽机 =k1D1+k2D e1 +k3

[0188] Right now:

[0189]

[0190] ①When D e1min <De1<D e1.a

[0191] D 1min =D 1.a

[0192] ②When D e1.a <D e1 <D e1max D1 and P e1 The equation of line ad is satisfied, and D1 = aP. e1汽机 +b satisfies the following formula:

[0193] P e1汽机 =k1D1+k2D e1 +k3

[0194] Substituting the values, we get:

[0195]

[0196] Simplifying, we get:

[0197]

[0198] 2) Upper limit calculation

[0199] In the calculation of the upper limit, since there is no turning point, there is only one case.

[0200] When D e1min <D e1 <D e1max

[0201] D 1max =D 1.d

[0202] In conclusion, D e1 Solving for the constraint relationship between D1 and D2:

[0203]

[0204] D 1max =D 1.d (D e1min <D e1 ≤De1max )

[0205] (2) Calculation Example

[0206]

[0207] 1) Lower limit calculation

[0208] As seen in the graph, point D represents the lower limit of the high-pressure main steam flow rate. e1min The turning point is D, so in order to calculate the upper and lower limits below, we first need to know D. e1.a The size, given the x and y coordinates of point a P e1汽机.a D 1.a We can obtain:

[0209]

[0210] ① When 0 <D e1 ≤124.21

[0211] D 1min =141

[0212] ②When 124.21 <D e1 ≤315, D1 and P e1 The equation of line ad satisfies the following condition:

[0213] D 1min =0.8344D e1 +37.36

[0214] 2) Upper limit calculation

[0215] In the calculation of the upper limit, since there is no turning point, there is only one case.

[0216] When D e1min <D e1 <D e1max

[0217] D 1max =300.3

[0218] In conclusion, D e1 Solving for the constraint relationship between D1 and D2:

[0219]

[0220] D 1max =300.3(0 <D e1 ≤315).

[0221] 3) The constraint relationship between De1 and D1

[0222] <![CDATA[D e1 ]]> <![CDATA[D 1min ]]> <![CDATA[D e1 ]]> <![CDATA[D 1max ]]> Point b 0 141 Point C <![CDATA[D e1.a =D e1.b =0]]> 300.3 Point A 124.21 141 point d 315 300.3 point d 315 300.3

[0223] The range of main steam flow rate under different extraction rates is as follows: Figure 5 As shown, the peak-shaving capacity curves for units with different extraction volumes are as follows: Figure 6 As shown.

[0224] Example 2:

[0225] Embodiment 2 of the present invention provides a system for deriving the characteristic equations of a combined cycle single-extraction heating unit, comprising:

[0226] The data acquisition module is configured to acquire the gas turbine temperature correction coefficient, gas turbine intake air volume, and steam turbine extraction steam volume.

[0227] The characteristic equation derivation module is configured to obtain the combined cycle power based on the first, second, and third coefficients in the steam turbine power expression, the fourth, fifth, sixth, seventh, and eighth coefficients in the gas turbine power expression, and the gas turbine temperature correction coefficient.

[0228] The working method of the system is the same as the derivation method of the characteristic equation of the combined cycle single-extraction heating unit provided in Example 1, and will not be repeated here.

[0229] Example 3:

[0230] Embodiment 3 of the present invention provides a computer-readable storage medium storing a program thereon, which, when executed by a processor, implements the steps in the derivation method of characteristic equations and power operating limits of combined cycle single-extraction heating units as described in Embodiment 1 of the present invention.

[0231] Example 4:

[0232] Embodiment 4 of the present invention provides an electronic device, including a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps in the derivation method of characteristic equation and power operation limit of combined cycle single-extraction heating unit as described in Embodiment 1 of the present invention.

[0233] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0234] This 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 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 computer program instructions. These computer program instructions can 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, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0235] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0236] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0237] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0238] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for deriving the characteristic equations of a combined cycle single-extraction heating unit, characterized in that: Includes the following processes: Obtain the gas turbine temperature correction coefficient, gas turbine air intake, and steam turbine extraction steam rate; The combined cycle power is obtained based on the first, second, and third coefficients in the steam turbine power expression, the fourth, fifth, sixth, seventh, and eighth coefficients in the gas turbine power expression, and the gas turbine temperature correction coefficient. The expression for the power of a steam turbine is: The power expression for a gas turbine is: ； The temperature correction factor for the gas turbine is: Combined cycle power is: in, t To correct the temperature before, k 9 is the ninth coefficient. k 10 It is the tenth coefficient. k 11 It is the eleventh coefficient; k 1 is the first coefficient. k 2 is the second coefficient. k 3 is the third coefficient. D 1 represents the high-pressure main steam flow rate. D e1 This refers to the steam extraction rate of the steam turbine. k 4 is the fourth coefficient. k 5 is the fifth coefficient. k 6 is the sixth coefficient. k 7 is the seventh coefficient. k 8 is the eighth coefficient, D rq This refers to gas consumption.

2. A method for deriving the power operating limit of a combined cycle single-extraction heating unit, characterized in that: The method for deriving the characteristic equations of a combined cycle single-extraction heating unit as described in claim 1 includes the following steps: When D e1min <D e1 <D e1.a D1 is a constant, and is D 1.b ,but: ； When D e1.a <D e1 <D e1max D1 and P e1 Satisfying D1=cP e1总 +d, then: ； 。 3. The method for deriving the characteristic equations of a combined cycle single-extraction heating unit as described in claim 2, characterized in that: When D e1min <D e1 <D e1.a hour: ; When D e1.a <D e1 <D e1max D1 and P e1 Satisfying D1=xP e1汽机 +y, then: ； 。 4. A system for deriving characteristic equations of a combined cycle single-extraction heating unit, characterized in that: include: The data acquisition module is configured to acquire the gas turbine temperature correction coefficient, gas turbine intake air volume, and steam turbine extraction steam volume. The characteristic equation derivation module is configured to: obtain the combined cycle power based on the first, second, and third coefficients in the steam turbine power expression, the fourth, fifth, sixth, seventh, and eighth coefficients in the gas turbine power expression, and the gas turbine temperature correction coefficient; The expression for the power of a steam turbine is: The power expression for a gas turbine is: ； The temperature correction factor for the gas turbine is: Combined cycle power is: in, t To correct the temperature before, k 9 is the ninth coefficient. k 10 It is the tenth coefficient. k 11 It is the eleventh coefficient; k 1 is the first coefficient. k 2 is the second coefficient. k 3 is the third coefficient. D 1 represents the high-pressure main steam flow rate. D e1 This refers to the steam extraction rate of the steam turbine. k 4 is the fourth coefficient. k 5 is the fifth coefficient. k 6 is the sixth coefficient. k 7 is the seventh coefficient. k 8 is the eighth coefficient, D rq This refers to gas consumption.

5. A computer-readable storage medium having a program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps in the method for deriving the characteristic equation of a combined cycle single-extraction heating unit as described in claim 1 or the method for deriving the power operating limit of a combined cycle single-extraction heating unit as described in any one of claims 2-3.

6. An electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the method for deriving the characteristic equation of a combined cycle single-extraction heating unit as described in claim 1 or the method for deriving the power operating limit of a combined cycle single-extraction heating unit as described in any one of claims 2-3.

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