Energy-saving evaluation system and evaluation method for steam turbine through-flow transformation

Abstract

The invention discloses an energy-saving evaluation system and evaluation method for steam turbine through-flow reconstruction, and the system comprises a data collection module, a model construction module, a result and graph module, and an energy-saving effect evaluation analysis module, and the output end of the data collection module is connected with the model construction module. The input end of the result and graph module is connected with the model building module, and the output end of the result and graph module is connected with the energy-saving effect evaluation and analysis module. A mathematical model before steam turbine through-flow transformation is established in the model building module according to the obtained data, and typical working condition performance data and an energy consumption curve of a steam turbine set before and after transformation are compared and analyzed in the energy-saving effect evaluation and analysis module through an energy consumption curve and a key energy efficiency index drawn in the result and graph module. And the energy-saving effect after the through-flow transformation is evaluated, the operation is simple and convenient, and the evaluation efficiency can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy assessment, and more particularly relates to an energy-saving assessment system and method for the flow path transformation of steam turbines. Background Art

[0002] Steam turbines are important equipment in industrial fields such as electric power and chemical industry. The flow path transformation of steam turbines is an important means to reduce the heat consumption rate of steam turbine units and the coal consumption for power generation and power supply. However, after the technical transformation of the flow path part, how to quickly evaluate the energy-saving effect after the transformation in the first time is a difficult problem.

[0003] Traditional energy-saving assessment methods are carried out through on-site tests according to the steam turbine performance test regulations and relevant national and industrial standards, and are determined through rigorous thermodynamic principle calculations and processes such as step-by-step review and verification. It is difficult to quickly evaluate the actual energy-saving effect after the transformation. Therefore, there is an urgent need for an assessment system and method that can quickly evaluate the energy-saving effect after the transformation to meet the actual production needs of power generation enterprises. Summary of the Invention

[0004] The main purpose of the present invention is to provide an energy-saving assessment system and method for the flow path transformation of steam turbines, so as to quickly evaluate the energy-saving effect after the flow path transformation of steam turbines and improve the assessment efficiency.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] An energy-saving assessment system for the flow path transformation of steam turbines includes a data acquisition module, a model construction module, a result and graph module, and an energy-saving effect assessment and analysis module. The data acquisition module is used to collect data before and after the flow path transformation of the steam turbine. The output end of the data acquisition module is connected to the model construction module. The model construction module can establish a mathematical model before and after the flow path transformation of the steam turbine according to the data of the data acquisition module. The input end of the result and graph module is connected to the model construction module. The result and graph module is used to display the calculation result of the mathematical model of the steam turbine after the transformation. The output end of the result and graph module is connected to the energy-saving effect assessment and analysis module. The energy-saving effect assessment and analysis module is used to evaluate the energy-saving effect after the flow path transformation of the steam turbine.

[0007] According to the first aspect embodiment of the present invention, the data acquisition module includes a first processing module and a second processing module that can respectively collect the reported performance data before the flow path transformation of the steam turbine and the power plant operation data after the transformation.

[0008] According to the first aspect embodiment of the present invention, the output ends of the first processing module and the second processing module are respectively connected to the model construction module.

[0009] According to an embodiment of the first aspect of the present invention, the energy-saving effect evaluation and analysis module can compare and analyze the typical operating condition performance data and energy consumption curves of the steam turbine unit before and after the retrofit through the comparison between the results and the graph module, so as to evaluate the energy-saving effect after the flow path retrofit.

[0010] According to an embodiment of the second aspect of the present invention, a method for evaluation through the energy-saving evaluation system for steam turbine flow path retrofit includes the following steps:

[0011] 1), Collect the energy consumption data of the steam turbine before the retrofit through the data acquisition module;

[0012] 2), Perform multiple linear fitting on the heat consumption rates of each operating condition collected, and establish a mathematical model and an energy consumption curve of the steam turbine generator set before the flow path retrofit;

[0013] 3), Construct a mathematical model of the steam turbine after the retrofit through the model construction module, and determine the correction parameters by obtaining real-time operation data such as the steam flow rate and steam enthalpy value of the steam turbine after the flow path retrofit through the second processing module;

[0014] 4), Calculate the performance data of each load condition through the mathematical model of the steam turbine after the retrofit through the results and graph module, draw the energy consumption curve, and compare and analyze it with the performance data and energy consumption curve of the corresponding operating condition before the retrofit;

[0015] 5), Evaluate the energy-saving effect after the retrofit through the energy-saving effect evaluation and analysis module.

[0016] According to an embodiment of the second aspect of the present invention, the energy consumption data collected in step 1) includes the heat consumption rate of the coal-fired power generation unit HR = α1 + α2x + α3x 2 + α4x 3 , The coal consumption for power generation The coal consumption for power supply

[0017] According to an embodiment of the second aspect of the present invention, the x is the power generation power, the α1 to α4 are all model parameters determined by the heat consumption rate under the operating conditions before the retrofit, the HR is the heat consumption rate of the steam turbine, and the η b is the boiler efficiency at the design value of the corresponding operating condition, the η p is the pipeline efficiency, and the ξ is the plant power consumption rate.

[0018] According to an embodiment of the second aspect of the present invention, the heat consumption rate of the steam turbine after the retrofit is k*HR + β, where k and β are correction parameters determined by the steam flow rate and enthalpy value of the corresponding operating conditions before and after the retrofit.

[0019] According to an embodiment of the second aspect of the present invention, the coal consumption for power generation after the retrofit is

[0020] According to the embodiment of the second aspect of the present invention, the modified power supply coal consumption is

[0021] At least one of the technical solutions in the above technical solutions of the present invention has the following advantages or beneficial effects:

[0022] The present invention intelligently collects the performance data of the steam turbine before the flow path modification through the data acquisition module, establishes a mathematical model of the steam turbine before the flow path modification in the model construction module according to the obtained data, draws an energy consumption curve and presents key energy efficiency indicators such as heat consumption rate and power supply and coal consumption in the result and graph module, and compares and analyzes the performance data and energy consumption curves of the typical working conditions of the steam turbine unit before and after the modification in the energy-saving effect evaluation and analysis module, and evaluates the energy-saving effect after the flow path modification, with simple operation and can effectively improve the evaluation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the drawings and embodiments;

[0024] Attached Figure 1 is the overall structure diagram of an embodiment of the present invention;

[0025] Attached Figure 2 is the working flow chart of the energy-saving evaluation system for the steam turbine flow path modification of an embodiment of the present invention;

[0026] Attached Figure 3 is the thermal balance diagram of the steam turbine generator set of an embodiment of the present invention;

[0027] Attached Figure 4 is the heat consumption rate curve of the steam turbine before and after the flow path modification of an embodiment of the present invention;

[0028] Attached Figure 5 is the power generation and power supply coal consumption curves of the steam turbine before and after the flow path modification of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship referred to, such as up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0031] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the number itself, and understandings such as "above", "below", "within", etc. include the number itself. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, or a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components, indirect communication or the interaction relationship between two components.

[0034] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0035] Refer to the attached Figure 1 to the attached Figure 5 As shown, an energy-saving evaluation system for steam turbine flow path retrofit includes a data acquisition module 1, a model construction module 2, a result and graph module 3, and an energy-saving effect evaluation and analysis module 4.

[0036] In an embodiment of the present invention, the data acquisition module 1 is used to collect data before and after the steam turbine flow path retrofit. The output end of the data acquisition module 1 is connected to the model construction module 2. The data acquisition module 1 includes a first processing module 11 and a second processing module 12 that can respectively collect the reported performance data before the steam turbine flow path retrofit and the power plant operation data after the retrofit. The output ends of the first processing module 11 and the second processing module 12 are respectively connected to the model construction module 2.

[0037] In an embodiment of the present invention, the model construction module 2 can establish a mathematical model before and after the steam turbine flow path retrofit according to the data of the data acquisition module 1. The input end of the result and graph module 3 is connected to the model construction module 2.

[0038] In one embodiment of the present invention, the result and graphics module 3 is used to display the calculation results of the retrofitted steam turbine mathematical model, and the output end of the result and graphics module 3 is connected to the energy-saving effect evaluation and analysis module 4.

[0039] In one embodiment of the present invention, the energy-saving effect evaluation and analysis module 4 is used to evaluate the energy-saving effect after the steam turbine flow path retrofit. The energy-saving effect evaluation and analysis module 4 can compare and analyze the typical operating condition performance data and energy consumption curves of the steam turbine unit before and after the retrofit through the result and graphics module 3 to evaluate the energy-saving effect after the flow path retrofit.

[0040] The steps of the evaluation method of this evaluation system are as follows:

[0041] First, use the data acquisition module 1, and according to the steam turbine thermal performance test report and design specification before the retrofit, collect the energy consumption data of the steam turbine before the retrofit, including the heat rate HR of the coal-fired power generation unit, the coal consumption for power generation bo, the coal consumption for power supply bg, etc.;

[0042] Furthermore, perform multiple linear fitting on the heat rates of each operating condition collected, and combine the definitions of the coal consumption for power generation and power supply to establish the mathematical model and energy consumption curve of the steam turbine generator set before the flow path retrofit. The model expression is as follows:

[0043] Heat rate HR of coal-fired power generation unit = α1 + α2x + α3x 2 + α4x 3 ;

[0044] Coal consumption for power generation

[0045] Coal consumption for power supply

[0046] Among them, HR is the heat rate of the steam turbine, with the unit of kJ / (kW·h); α1 to α4 are model parameters determined by the heat rates at 4 operating conditions in the report before the retrofit; x is the power generation, with the unit of MW; bo is the coal consumption for power generation, with the unit of g / (kW·h); b g is the coal consumption for power supply, with the unit of g / (kW·h); η b is the boiler efficiency, taking the design value corresponding to the operating condition; η p is the pipeline efficiency, taking 0.99; ξ is the plant electricity consumption rate, taking the empirical value of 4.48 - 4.64%; 29.307 is the lower calorific value of standard coal, with the unit of MJ / kg.

[0047] Furthermore, construct the mathematical model of the retrofitted steam turbine through the model construction module 2, and obtain the real-time operation data such as the steam flow rate and steam enthalpy value of the steam turbine after the flow path retrofit through the second processing module 12 to determine the correction parameters;

[0048] Furthermore, determine the heat rate HR of the retrofitted steam turbine改造后 It is k*HR + β, where k and β are correction parameters determined by the steam flow rate and enthalpy value under the corresponding working conditions before and after the transformation, and k and β are determined by the steam flow rate and enthalpy value under the corresponding working conditions before and after the transformation;

[0049] Furthermore, the power generation coal consumption b after the transformation o改造后 is in g / (kW·h); the power supply coal consumption b after the transformation g改造后 is in g / (kW·h);

[0050] Furthermore, through the result and graphics module 3, the performance data under each load condition are calculated from the mathematical model of the transformed steam turbine and the energy consumption curve is drawn, and a comparative analysis is made with the performance data and energy consumption curve under the corresponding working conditions before the transformation;

[0051] Finally, the energy-saving effect after the transformation is evaluated through the energy-saving effect evaluation and analysis module 4.

[0052] In an embodiment of the present invention, in practical applications, this evaluation system first intelligently collects the performance data of the steam turbine before the through-flow transformation through the data acquisition module 1, then establishes a mathematical model of the steam turbine before the through-flow transformation in the model construction module 2, constructs a mathematical model of the energy efficiency of the transformed steam turbine by introducing correction parameters k and β, and determines the correction parameters based on the real-time operation data of the power plant such as the steam flow rate and enthalpy value of the transformed steam turbine. And the performance data after the transformation under each typical load condition of the steam turbine are obtained through model calculation, and the energy consumption curve and key energy efficiency indicators such as heat consumption rate, power generation and supply coal consumption are presented in the result and graphics module. Finally, in the energy-saving effect evaluation and analysis module, a comparative analysis is made on the performance data and energy consumption curve of the typical working conditions of the steam turbine unit before and after the transformation (refer to Appendix Figure 4 、Appendix Figure 5 ), and the energy-saving effect after the through-flow transformation is evaluated.

[0053] Thus, the energy-saving effect after the through-flow transformation of the steam turbine can be quickly evaluated, meeting the actual production needs of power generation enterprises. At the same time, this evaluation system and evaluation method have high generality and scalability, and can be widely applied to the evaluation of the through-flow transformation of steam turbines of different types and specifications. In addition, this evaluation system and evaluation method also have the advantages of simple operation and fast calculation, and can greatly improve the evaluation efficiency.

[0054] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An energy-saving evaluation system for the steam turbine flow path retrofit, characterized in that It includes a data acquisition module (1), a model construction module (2), a result and graph module (3), and an energy-saving effect evaluation and analysis module (4). The data acquisition module (1) is used to collect data before and after the steam turbine flow path transformation. The output end of the data acquisition module (1) is connected to the model construction module (2). The model construction module (2) can establish a mathematical model of the steam turbine before and after the flow path transformation according to the data of the data acquisition module (1). The input end of the result and graph module (3) is connected to the model construction module (2). The result and graph module (3) is used to display the calculation results of the mathematical model of the steam turbine after transformation. The output end of the result and graph module (3) is connected to the energy-saving effect evaluation and analysis module (4). The energy-saving effect evaluation and analysis module (4) is used to evaluate the energy-saving effect after the steam turbine flow path transformation.

2. The energy-saving evaluation system for steam turbine flow path retrofit according to claim 1, wherein: The data acquisition module (1) includes a first processing module (11) and a second processing module (12) that can respectively collect the reported performance data before the steam turbine flow path transformation and the power plant operation data after the transformation.

3. The energy-saving evaluation system for steam turbine flow path retrofit according to claim 2, characterized in that: The output ends of the first processing module (11) and the second processing module (12) are respectively connected to the model construction module (2).

4. The energy-saving evaluation system for steam turbine flow path retrofit according to claim 1, characterized in that: The energy-saving effect evaluation and analysis module (4) can compare and analyze the typical operating condition performance data and energy consumption curves of the steam turbine unit before and after the transformation through the result and graph module (3) to evaluate the energy-saving effect after the flow path transformation.

5. A method for evaluation by means of an energy-saving evaluation system for steam turbine flow path retrofit according to any one of claims 1 to 4, characterized in that, It includes the following steps: 1). Collect the energy consumption data of the steam turbine before the transformation through the data acquisition module (1); 2). Conduct multiple linear fitting on the heat consumption rates of each operating condition collected, and establish a mathematical model and an energy consumption curve of the steam turbine generator set before the flow path transformation; 3). Construct a mathematical model of the steam turbine after the transformation through the model construction module (2), and obtain real-time operation data such as the steam flow rate and steam enthalpy value of the steam turbine after the flow path transformation through the second processing module (12) to determine the correction parameters; 4). Obtain the performance data of each load condition through the calculation of the mathematical model of the steam turbine after the transformation through the result and graph module (3) and draw the energy consumption curve, and conduct a comparative analysis with the performance data and energy consumption curve of the corresponding operating condition before the transformation; 5). Evaluate the energy-saving effect after the transformation through the energy-saving effect evaluation and analysis module (4).

6. The evaluation method according to claim 5, characterized in that: The energy consumption data collected in step 1) includes the heat rate HR of the coal-fired power generation unit = α1 + α2x + α3x 2 + α4x 3 and the coal consumption for power generation and the coal consumption for power supply 7. The evaluation method according to claim 6, characterized in that: where x is the power generation, α1 to α4 are all model parameters determined by the heat rate under the pre-transformation operating conditions, HR is the heat rate of the steam turbine, η b is the boiler efficiency corresponding to the design value of the operating condition, η p is the pipeline efficiency, and ξ is the auxiliary power consumption rate.

8. The evaluation method according to claim 6, wherein: In step 3), the heat consumption rate of the steam turbine after the transformation is k*HR + β, where k and β are correction parameters determined by the steam flow rate and enthalpy value of the corresponding operating condition before and after the transformation.

9. The evaluation method according to claim 8, wherein: The power generation coal consumption after transformation is 10. The evaluation method according to claim 8, characterized in that: The power supply coal consumption after transformation is

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