Pipe network optimization method and system for gas-steam combined cycle combined heat and power generation unit
By constructing multiple steam pipeline network schemes, establishing a direct correlation between the steam pipeline network and the steam supply parameters of the unit, quantifying heat consumption, and combining annual operating revenue and investment costs, the problem of the separation between the steam pipeline network and the unit in traditional design was solved, and the overall cost optimization of the gas-steam combined cycle cogeneration unit was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-26
- Publication Date
- 2026-04-07
AI Technical Summary
In existing technologies, the steam pipeline network design of gas-steam combined cycle cogeneration units cannot ensure optimal overall cost. Traditional step-by-step design leads to a disconnect between the pipeline network and the unit design, making it impossible to achieve the best match.
By constructing multiple steam pipeline network schemes, calculating the total annual investment cost, establishing a direct correlation between the steam pipeline network and the steam supply parameters of the unit, establishing a bottom-level steam cycle thermodynamic design model, quantifying heat consumption, and combining annual operating revenue and investment costs, the optimal steam pipeline network scheme is determined.
It achieves synergistic optimization of steam pipeline network and unit performance, reduces the overall cost of gas-steam combined cycle cogeneration units and their steam pipeline network, and improves system economy.
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Figure CN121810362A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of gas-steam combined cycle cogeneration unit, in particular to a pipe network optimization method and system of a gas-steam combined cycle cogeneration unit. BACKGROUND
[0002] The gas-steam combined cycle cogeneration unit has the advantages of clean and environmental protection, high comprehensive efficiency, small land occupation, etc. It is not only applied to large cities in the north of China such as Beijing as the main heat source for central heating, but also applied to economically developed areas such as Guangdong and Jiangsu in the south of China as the heat source for industrial steam. In the design process of the gas-steam combined cycle cogeneration unit and its steam pipe network, the thermal design of the gas-steam combined cycle cogeneration unit and the thermal design of the steam pipe network are generally carried out in steps. First, the steam parameters (steam pressure and temperature) required at the inlet of the steam pipe network are determined by the thermal design of the steam pipe network. Since the steam parameters (steam pressure and temperature) required at the inlet of the steam pipe network are the steam supply parameters (steam supply pressure and temperature) of the gas-steam combined cycle cogeneration unit, the thermal design of the gas-steam combined cycle cogeneration unit is then carried out based on the determined steam supply parameters to determine the operating performance of the unit. Although the above optimization method can significantly reduce the investment cost of the steam pipe network, it cannot ensure the optimal comprehensive cost of the gas-steam combined cycle cogeneration unit and its steam pipe network. SUMMARY
[0003] In view of the problems in the prior art, the present application provides a pipe network optimization method and system of a gas-steam combined cycle cogeneration unit, which reduces the comprehensive cost of the gas-steam combined cycle cogeneration unit and its steam pipe network by determining the optimal steam pipe network design scheme.
[0004] The present application is realized by the following technical solutions: A pipe network optimization method of a gas-steam combined cycle cogeneration unit, comprising the following steps: Step 1, constructing multiple steam pipe network schemes, the diameters of different pipe sections of each steam pipe network scheme being different, and determining the annual total investment cost of each steam pipe network scheme; Step 2, determining the steam supply parameters of the gas-steam combined cycle cogeneration unit corresponding to each steam pipe network scheme according to the steam parameters at the inlet of each steam pipe network scheme; Step 3, establishing a bottom steam cycle thermal design model of the gas-steam combined cycle cogeneration unit, determining the bottom steam cycle thermal scheme of each gas-steam combined cycle cogeneration unit according to the steam supply parameters of each gas-steam combined cycle cogeneration unit, and determining the heat consumption of each gas-steam combined cycle cogeneration unit according to the bottom steam cycle thermal scheme; Step 4: Determine the annual operating revenue of the gas-steam combined cycle cogeneration unit based on its heat consumption, and combine it with the total annual investment cost to obtain the annual comprehensive cost of the steam pipeline network scheme. Determine the optimal steam pipeline network scheme based on the annual comprehensive cost.
[0005] Preferably, the total annual investment cost of the steam pipeline network scheme described in step 1 includes: Calculate the total cost of each steam pipeline network scheme based on the cost of different pipe section diameters; The total annual investment cost of the steam pipeline network scheme is determined based on the total cost of each scheme and the annual rate of return on capital.
[0006] Preferably, the total cost of the steam pipeline network scheme is calculated as follows:
[0007] In the formula, The total cost of the steam pipeline network scheme, This relates the diameter of different pipe sections in a steam pipeline network scheme to the total cost of the steam pipeline network. This refers to the diameter schemes for different pipe sections in the steam pipeline network design.
[0008] Preferably, the method for determining the steam parameters at the inlet of the steam pipeline network scheme is as follows: Based on the diameters of different pipe sections in each steam network scheme, a hydraulic and thermal calculation model for the steam network is established. The steam parameters at the inlet of each steam network scheme, including steam pressure and temperature, are calculated according to the hydraulic and thermal calculation model.
[0009] Preferably, the calculation method for the steam supply parameters of the gas-steam combined cycle cogeneration unit is as follows:
[0010] In the formula: P heat,supply For the steam supply pressure of the gas-steam combined cycle cogeneration unit, T heat,supply This refers to the steam supply temperature of a gas-steam combined cycle cogeneration unit.
[0011] Preferably, the calculation method for the heat consumption of the gas-steam combined cycle cogeneration unit is as follows:
[0012] In the formula, For the heat consumption of gas-steam combined cycle cogeneration units, This relates the unit's heat consumption to its steam supply parameters.
[0013] Preferably, determining the annual operating revenue of the gas-steam combined cycle cogeneration unit based on its heat consumption includes: Based on the heat consumption of the gas-steam combined cycle cogeneration units corresponding to each steam pipeline scheme, and combined with the annual operating hours of the units, electricity price, and natural gas price, the annual operating revenue of each gas-steam combined cycle cogeneration unit is calculated.
[0014] Preferably, the annual operating revenue of the gas-steam combined cycle cogeneration unit is calculated as follows:
[0015] In the formula: For the annual operating revenue of gas-steam combined cycle cogeneration units, The annual power generation of the gas-steam combined cycle cogeneration unit, For electricity price, The calorific value of natural gas. For the density of natural gas, This refers to the price of natural gas.
[0016] Preferably, determining the optimal steam pipeline network scheme based on the annual comprehensive cost includes: The annual comprehensive cost of steam pipeline network schemes is ranked, and the steam pipeline network scheme with the lowest annual comprehensive cost is selected as the optimal steam pipeline network scheme.
[0017] An optimized design system for a gas-steam combined cycle cogeneration unit includes: The pipeline cost module is used to construct various steam pipeline network schemes. The diameters of different pipe sections in each steam pipeline network scheme are different, and the total annual investment cost of each steam pipeline network scheme is determined. The steam supply parameter module is used to determine the steam supply parameters of the gas-steam combined cycle cogeneration unit corresponding to each steam pipeline scheme based on the steam parameters at the inlet of each steam pipeline scheme. The heat consumption module is used to establish the bottom steam cycle thermodynamic design model of the gas-steam combined cycle cogeneration unit, determine the bottom steam cycle thermodynamic scheme of each gas-steam combined cycle cogeneration unit based on the steam supply parameters of each gas-steam combined cycle cogeneration unit, and determine the heat consumption of each gas-steam combined cycle cogeneration unit based on the bottom steam cycle thermodynamic scheme. The pipeline optimization module is used to determine the annual operating revenue of the gas-steam combined cycle cogeneration unit based on its heat consumption, and to obtain the annual comprehensive cost of the steam pipeline scheme by combining it with the total annual investment cost. The optimal steam pipeline scheme is then determined based on the annual comprehensive cost.
[0018] Compared with the prior art, the present invention has the following beneficial technical effects: This application provides a pipeline network optimization method for gas-steam combined cycle cogeneration units. Its core lies in constructing a closed-loop logic for the coordinated optimization of steam pipeline network schemes and unit performance. This effectively overcomes the problem of insufficient overall cost caused by the separation of pipeline network and unit design in traditional step-by-step design. Firstly, by constructing various steam pipeline network schemes with different pipe diameters and calculating the total annual investment cost, this method provides a rich library of alternative schemes for subsequent optimization, avoiding the local optimum trap that may result from a single scheme and ensuring the comprehensiveness of the optimization scope. Secondly, by directly linking the steam parameters at the steam pipeline network inlet to the unit's steam supply parameters, it breaks away from the traditional design approach of "fixed pipeline parameters and passive unit adaptation." This approach establishes a direct link between pipeline network design and unit performance, enabling precise matching of their parameters and laying the foundation for accurate calculation of unit thermal performance. Furthermore, by establishing a bottom-level steam cycle thermal design model for the unit, steam supply parameters are transformed into heat consumption, a core indicator reflecting unit energy consumption. This quantifies the impact of pipeline network design on unit operating efficiency, establishing a traceable causal relationship between pipeline network design and unit energy consumption. Finally, by combining the total annual investment cost of the steam pipeline network with the annual operating revenue of the unit to calculate the annual comprehensive cost and determine the optimal solution, a system-level trade-off between "investment cost and operating revenue" is achieved. This avoids the problem of excessively high unit operating costs due to solely pursuing low pipeline network investment, and also avoids the one-sidedness of focusing only on unit efficiency while neglecting pipeline network investment. Ultimately, this significantly reduces the comprehensive cost of the gas-steam combined cycle cogeneration unit and its steam pipeline network, improving the overall economic efficiency of the system. This end-to-end design, from scheme construction to parameter correlation, performance quantification and comprehensive optimization, realizes the coordinated optimization of pipeline network and unit, and provides a scientific and operable method for the efficient and economical design of cogeneration system.
[0019] This application also proposes a pipeline optimization system for gas-steam combined cycle cogeneration units, which possesses all the advantages of the aforementioned pipeline optimization methods for gas-steam combined cycle cogeneration units. Attached Figure Description
[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a flowchart of the pipeline network optimization method for the gas-steam combined cycle cogeneration unit of the present invention. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0024] A method for optimizing the pipeline network of a gas-steam combined cycle cogeneration unit includes the following steps: Step 1: Construct multiple steam pipeline network schemes. The diameters of different pipe sections in each steam pipeline network scheme are different. Determine the total annual investment cost of each steam pipeline network scheme. The diameter of the pipe sections in a steam pipeline network directly affects the amount of materials used, the difficulty of construction, and the initial investment (the larger the pipe diameter, the higher the material cost, but it may reduce the pipeline resistance loss). By changing the diameter of different pipe sections, a variety of differentiated steam pipeline network schemes can be generated; then, based on the total cost of each scheme and the annual rate of return on capital, the total cost is allocated to the annual investment cost (i.e., the annual total investment cost), thus achieving the annual quantification of the one-time investment.
[0025] It covers the possibilities of different pipe diameter combinations, avoids local optima caused by a single solution, and provides a comprehensive alternative solution library for subsequent integrated optimization; it converts the initial investment into annual cost, which is convenient for direct comparison with the benefits / costs of the subsequent operation phase, and unifies the quantitative dimensions.
[0026] Step 2: Determine the steam supply parameters of the gas-steam combined cycle cogeneration unit corresponding to each steam network scheme based on the steam parameters at the inlet of each steam network scheme. The steam parameters at the inlet of the steam pipeline network are the core requirements for the network operation and are determined by the hydraulic and thermal calculation models of the network. Since the steam supply from the generating unit must directly meet the inlet requirements of the pipeline network (steam enters the pipeline network after being output from the generating unit, and the inlet parameters are the actual output parameters of the steam supplied by the generating unit), the steam supply parameters of the generating unit are equal to the inlet parameters of the pipeline network.
[0027] Establish a direct link between steam pipeline design and unit design, breaking the fragmented model of "pipeline network parameters set and unit passive adaptation" in traditional step-by-step design, and ensure parameter matching between the two; provide clear input conditions for subsequent unit thermal performance calculations, and enable unit operating performance and pipeline design to work together.
[0028] Step 3: Establish the bottom steam cycle thermodynamic design model of the gas-steam combined cycle cogeneration unit. Based on the steam supply parameters of each gas-steam combined cycle cogeneration unit, determine the bottom steam cycle thermodynamic scheme of each gas-steam combined cycle cogeneration unit. Based on the bottom steam cycle thermodynamic scheme, determine the heat consumption of each gas-steam combined cycle cogeneration unit. The steam supply parameters of the unit directly affect the thermodynamic processes of the underlying steam cycle (such as steam expansion work efficiency and waste heat recovery efficiency). By establishing a steam cycle thermodynamic design model, the relationship between steam supply parameters and heat consumption (heat consumption per unit of electricity generated) can be quantified. The higher the steam supply parameters, the higher the steam cycle efficiency and the lower the heat consumption may be.
[0029] By transforming steam supply parameters into core indicators of unit operating efficiency (heat consumption), the impact of pipeline design on unit energy consumption is quantified; key parameters are provided for subsequent calculation of operating benefits, enabling a traceable causal chain of "pipeline design - unit performance - operating cost".
[0030] Step 4: Determine the annual operating revenue of the gas-steam combined cycle cogeneration unit based on its heat consumption, and combine it with the total annual investment cost to obtain the annual comprehensive cost of the steam pipeline network scheme. Determine the optimal steam pipeline network scheme based on the annual comprehensive cost.
[0031] The annual comprehensive cost needs to consider both the annual investment cost of the steam pipeline network and the annual operating revenue of the unit. The annual comprehensive cost of each scheme should be calculated, and the scheme with the lowest cost should be selected as the optimal one. This achieves a comprehensive trade-off between investment and revenue, avoiding one-sided optimization that only pursues low pipeline investment (which may lead to high unit heat consumption and high operating costs) or only pursues low unit heat consumption (which may lead to excessively high pipeline investment). The final optimal scheme minimizes the comprehensive cost of the gas-steam combined cycle cogeneration system throughout its entire life cycle, improving overall economic efficiency.
[0032] Example 1 A method for optimizing the pipeline network of a gas-steam combined cycle cogeneration unit includes the following steps: Step 1: Change the diameter of different pipe sections in different steam pipe networks to obtain M steam pipe network schemes, and calculate the total cost of the M steam pipe network schemes based on the cost of different pipe section diameters.
[0033] The formula for calculating the total cost of the i-th scheme among the M steam pipeline network schemes is as follows:
[0034] In the formula: —The total cost of the i-th steam pipeline network scheme, in ten thousand yuan; —The relationship between the diameter of different pipe sections and the total cost of the steam pipeline network in the i-th steam pipeline network scheme; —Diameter schemes for different pipe sections in the i-th steam pipeline network scheme; Step 2: Based on the total cost of the M steam pipeline network schemes, calculate the total annual investment cost of the M steam pipeline network schemes.
[0035] The formula for calculating the total annual investment cost of the i-th option is as follows:
[0036] In the formula: —The total annual investment cost of the i-th steam pipeline network scheme, in RMB 10,000 per year; —Annual rate of return on capital.
[0037] Step 3: Based on the diameters of different pipe sections of the M steam pipeline network schemes, establish a hydraulic and thermal calculation model for the steam pipeline network, and calculate the steam pressure and temperature at the inlet of the M steam pipeline network schemes.
[0038] The formulas for calculating the steam pressure and temperature at the inlet of the steam pipeline for the i-th scheme are as follows:
[0039] In the formula: P heat,inlet Let be the steam pressure at the inlet of the steam network for the i-th steam network scheme, in MPa; T heat,inlet Let be the steam temperature at the inlet of the steam network for the i-th steam network scheme, in °C; f pipe This is the hydraulic and thermal calculation model for the steam heating network of the i-th steam network scheme.
[0040] Step 4: Based on the calculated steam pressure and temperature at the inlet of the steam network for the M steam network schemes, determine the steam supply parameters (steam supply pressure and temperature) of the gas-steam combined cycle cogeneration unit corresponding to the M steam network schemes.
[0041] The calculation formulas for the steam supply parameters (steam pressure and temperature) of the gas-steam combined cycle cogeneration unit corresponding to the i-th scheme are as follows:
[0042] In the formula: P heat,supply is the steam supply pressure of the gas-steam combined cycle cogeneration unit corresponding to the i-th scheme, in MPa; T heat,supply Let be the steam supply temperature of the gas-steam combined cycle cogeneration unit corresponding to the i-th scheme, in °C.
[0043] Step 5: Establish the bottom-level steam cycle thermodynamic design model of the gas-steam combined cycle cogeneration unit. Based on the steam supply parameters (steam supply pressure and temperature) of the gas-steam combined cycle cogeneration unit corresponding to the determined M steam network schemes, calculate the bottom-level steam cycle thermodynamic scheme of the gas-steam combined cycle cogeneration unit corresponding to the M steam network schemes, and calculate the heat consumption of the gas-steam combined cycle cogeneration unit corresponding to the M steam network schemes.
[0044] The formula for calculating the heat consumption of the gas-steam combined cycle cogeneration unit corresponding to the i-th scheme is:
[0045] In the formula: Let be the heat consumption of the gas-steam combined cycle cogeneration unit corresponding to the i-th scheme, in kJ / kW.h; This represents the relationship between the unit's heat consumption and the unit's steam supply parameters (steam supply pressure and temperature) for the i-th scheme.
[0046] Step 6: Based on the heat consumption of the gas-steam combined cycle cogeneration unit corresponding to the M types of steam pipeline network schemes, and based on the annual operating hours of the unit, electricity price, and natural gas price, calculate the annual operating revenue of the gas-steam combined cycle cogeneration unit corresponding to the M types of steam pipeline network schemes.
[0047] The formula for calculating the annual operating revenue of the gas-steam combined cycle cogeneration unit corresponding to the i-th scheme is:
[0048] In the formula: The annual operating revenue of the gas-steam combined cycle cogeneration unit corresponding to the i-th scheme is RMB 10,000 / year; Let be the annual power generation of the gas-steam combined cycle cogeneration unit corresponding to the i-th scheme, in kW.h; Electricity price, in yuan / kW.h; The calorific value of natural gas is expressed in kJ / kg. The density of natural gas is kg / m³. 3 ; The price is for natural gas, in yuan / m³.3 ; Step 7: Based on the calculation of the total annual investment cost of the M types of steam pipeline network schemes obtained in the previous step, and the annual operating revenue of the gas-steam combined cycle cogeneration unit corresponding to the M types of steam pipeline network schemes, calculate the annual comprehensive cost of the M types of steam pipeline network schemes.
[0049] The formula for calculating the annual comprehensive cost of the i-th option is:
[0050] In the formula: —The annual comprehensive cost corresponding to the i-th option is RMB 10,000 per year.
[0051] Compare the annual comprehensive costs of M steam pipeline network schemes, and determine the optimal steam pipeline network scheme based on the lowest annual comprehensive cost.
[0052] Example 2 A power plant plans to conduct a comprehensive "source-grid" optimization design project for a gas-steam combined cycle cogeneration unit. The aim is to determine the optimal steam pipeline network scheme by comparing different schemes, thereby reducing the overall cost of the gas-steam combined cycle cogeneration unit and its steam pipeline network. This application employs a pipeline network optimization method for a gas-steam combined cycle cogeneration unit, comprising the following steps: Step 1: Construct multiple steam pipeline network schemes: At the initial stage of the project, the design team constructed several steam piping network schemes, each with different pipe section diameters. The team considered five steam piping network schemes with different pipe diameter combinations, labeled Scheme A through Scheme E. These schemes covered a range of possibilities, from conservative to optimized designs, to ensure comprehensive optimization.
[0053] Step 2: Calculate the total annual investment cost for each steam pipeline network scheme: The annual return on capital is set at 8%, and the project lifespan is 20 years.
[0054] For each option, the design team first calculated the total cost of each of the five options based on the diameter of different pipe sections.
[0055] Step 3: Determine the steam supply parameters corresponding to each steam pipeline network scheme.
[0056] Based on the different pipe section diameters of each steam pipeline scheme, a hydraulic and thermal calculation model for the steam pipeline network was established, and the steam pressure and temperature at the inlet of each scheme were calculated.
[0057] In the initial design, one scheme had inlet steam parameters of 1.55 MPa and 320°C. However, through optimized design, the optimal scheme C had inlet steam parameters increased to 1.75 MPa and 330°C.
[0058] Step 4: Determine the underlying steam cycle thermodynamic scheme and heat consumption for each scheme.
[0059] A bottom-level steam cycle thermodynamic design model for a gas-steam combined cycle cogeneration unit was established, and the bottom-level steam cycle thermodynamic schemes and heat consumption were determined based on the steam supply parameters of each scheme. It is worth noting that in this embodiment, although the steam supply parameters of the optimal scheme C are improved, its heat consumption remains unchanged due to the optimization of the unit design.
[0060] Step 5: Calculate the annual operating revenue and annual comprehensive cost of each plan. Based on the unit heat consumption of each scheme, combined with the annual operating hours of the unit (8000 hours), electricity price (0.5 yuan / kW·h), and natural gas price (3 yuan / m³, calorific value 40,000kJ / m³, density 0.75kg / m³), the annual operating revenue of each scheme was calculated. Subsequently, combined with the total annual investment cost, the annual comprehensive cost of each scheme was calculated.
[0061] Step 6: Determine the optimal steam pipeline network scheme.
[0062] By comparing the annual comprehensive costs of each option, it was found that option C has the lowest annual comprehensive cost.
[0063] Specifically, compared with the initial design scheme (inlet steam parameters of 1.55MPa and 320℃), the total cost of the steam pipeline network in Scheme C (inlet steam parameters of 1.75MPa and 330℃) decreased by 21.76 million yuan, and the annual comprehensive cost decreased by approximately 4.8 million yuan per year. Therefore, Scheme C was determined to be the optimal steam pipeline network scheme.
[0064] This power plant conducted a comprehensive optimization design of the "source-grid" of its gas-steam combined cycle cogeneration unit, ultimately determining the optimal steam pipeline network scheme by comparing different options. Compared to the scheme with a steam pressure and temperature of 1.55 MPa and 320°C at the steam pipeline inlet, the optimal steam pipeline network scheme increases the steam pressure and temperature at the inlet from 1.55 MPa and 320°C to 1.75 MPa and 330°C. After optimization, the heat consumption of the gas-steam combined cycle cogeneration unit remains unchanged, therefore the annual operating revenue remains unchanged. However, the total cost of the steam pipeline network decreases by 21.76 million yuan, resulting in a reduction of approximately 4.8 million yuan per year in overall annual costs.
[0065] Example 3 An optimized design system for a gas-steam combined cycle cogeneration unit includes: The pipeline cost module is used to construct various steam pipeline network schemes. The diameters of different pipe sections in each steam pipeline network scheme are different, and the total annual investment cost of each steam pipeline network scheme is determined. The steam supply parameter module is used to determine the steam supply parameters of the gas-steam combined cycle cogeneration unit corresponding to each steam pipeline scheme based on the steam parameters at the inlet of each steam pipeline scheme. The heat consumption module is used to establish the bottom steam cycle thermodynamic design model of the gas-steam combined cycle cogeneration unit, determine the bottom steam cycle thermodynamic scheme of each gas-steam combined cycle cogeneration unit based on the steam supply parameters of each gas-steam combined cycle cogeneration unit, and determine the heat consumption of each gas-steam combined cycle cogeneration unit based on the bottom steam cycle thermodynamic scheme. The pipeline optimization module is used to determine the annual operating revenue of the gas-steam combined cycle cogeneration unit based on its heat consumption, and to obtain the annual comprehensive cost of the steam pipeline scheme by combining it with the total annual investment cost. The optimal steam pipeline scheme is then determined based on the annual comprehensive cost.
[0066] It should be noted that, in the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into another device, or some features may be ignored or not executed. The modules described as separate components may or may not be physically separated. The components shown as modules may be one or more physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the modules can be selected to achieve the purpose of the solution in this embodiment according to actual needs.
[0067] Furthermore, in the various embodiments of the present invention, the modules can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit. The integrated unit described above can be implemented in hardware or as a software functional unit.
[0068] An electronic device provided in this application includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the optimized design method for a gas-steam combined cycle cogeneration unit as described in any of the above embodiments.
[0069] Another electronic device provided in this application embodiment may further include: an input port connected to a processor for transmitting multimodal data collected by an external acquisition device to the processor; a display unit connected to the processor for displaying the processor's processing results to the outside world; and a communication module connected to the processor for enabling communication between the electronic device and the outside world. The display unit may be a display panel, a laser scanning display, etc.; the communication method adopted by the communication module includes, but is not limited to, Mobile High Definition Link (HML), Universal Serial Bus (USB), High Definition Multimedia Interface (HDMI), and wireless connection (including Wi-Fi, Bluetooth, Bluetooth Low Energy, and IEEE 802.11s-based communication technology).
[0070] This application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the steps of the optimized design method for a gas-steam combined cycle cogeneration unit as described in any of the above embodiments.
[0071] For descriptions of relevant parts of the optimization design system, electronic equipment, and computer-readable storage medium for gas-steam combined cycle cogeneration units provided in this application, please refer to the detailed descriptions of the corresponding parts in the optimization design method for gas-steam combined cycle cogeneration units provided in this application, which will not be repeated here. Furthermore, parts of the technical solutions provided in this application that are consistent with the implementation principles of corresponding technical solutions in the prior art have not been described in detail to avoid excessive elaboration.
[0072] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.
Claims
1. A method for optimizing the pipeline network of a gas-steam combined cycle cogeneration unit, characterized in that, Includes the following steps: Step 1: Construct multiple steam pipeline network schemes. The diameters of different pipe sections in each steam pipeline network scheme are different. Determine the total annual investment cost of each steam pipeline network scheme. Step 2: Determine the steam supply parameters of the gas-steam combined cycle cogeneration unit corresponding to each steam network scheme based on the steam parameters at the inlet of each steam network scheme. Step 3: Establish the bottom steam cycle thermodynamic design model of the gas-steam combined cycle cogeneration unit. Based on the steam supply parameters of each gas-steam combined cycle cogeneration unit, determine the bottom steam cycle thermodynamic scheme of each gas-steam combined cycle cogeneration unit. Based on the bottom steam cycle thermodynamic scheme, determine the heat consumption of each gas-steam combined cycle cogeneration unit. Step 4: Determine the annual operating revenue of the gas-steam combined cycle cogeneration unit based on its heat consumption, and combine it with the total annual investment cost to obtain the annual comprehensive cost of the steam pipeline network scheme. Determine the optimal steam pipeline network scheme based on the annual comprehensive cost.
2. The pipeline network optimization method for a gas-steam combined cycle cogeneration unit according to claim 1, characterized in that, The total annual investment cost of the steam pipeline network scheme described in step 1 includes: Calculate the total cost of each steam pipeline network scheme based on the cost of different pipe section diameters; The total annual investment cost of the steam pipeline network scheme is determined based on the total cost of each scheme and the annual rate of return on capital.
3. The pipeline network optimization method for a gas-steam combined cycle cogeneration unit according to claim 1, characterized in that, The total cost of the steam pipeline network scheme is calculated as follows: In the formula, The total cost of the steam pipeline network scheme, This relates the diameter of different pipe sections in a steam pipeline network scheme to the total cost of the steam pipeline network. This refers to the diameter schemes for different pipe sections in the steam pipeline network design.
4. The pipeline network optimization method for a gas-steam combined cycle cogeneration unit according to claim 1, characterized in that, The method for determining the steam parameters at the inlet of the steam pipeline network scheme is as follows: Based on the diameters of different pipe sections in each steam network scheme, a hydraulic and thermal calculation model for the steam network is established. The steam parameters at the inlet of each steam network scheme, including steam pressure and temperature, are calculated according to the hydraulic and thermal calculation model.
5. The pipeline network optimization method for a gas-steam combined cycle cogeneration unit according to claim 1, characterized in that, The calculation method for the steam supply parameters of the gas-steam combined cycle cogeneration unit is as follows: In the formula: P heat,supply For the steam supply pressure of the gas-steam combined cycle cogeneration unit, T heat,supply This refers to the steam supply temperature of a gas-steam combined cycle cogeneration unit.
6. The pipeline network optimization method for a gas-steam combined cycle cogeneration unit according to claim 1, characterized in that, The calculation method for the heat consumption of the gas-steam combined cycle cogeneration unit is as follows: In the formula, For the heat consumption of gas-steam combined cycle cogeneration units, This relates the unit's heat consumption to its steam supply parameters.
7. The pipeline network optimization method for a gas-steam combined cycle cogeneration unit according to claim 1, characterized in that, The determination of annual operating revenue based on the heat consumption of the gas-steam combined cycle cogeneration unit includes: Based on the heat consumption of the gas-steam combined cycle cogeneration units corresponding to each steam pipeline scheme, and combined with the annual operating hours of the units, electricity price, and natural gas price, the annual operating revenue of each gas-steam combined cycle cogeneration unit is calculated.
8. The pipeline network optimization method for a gas-steam combined cycle cogeneration unit according to claim 7, characterized in that, The calculation method for the annual operating revenue of the gas-steam combined cycle cogeneration unit is as follows: In the formula: For the annual operating revenue of gas-steam combined cycle cogeneration units, The annual power generation of the gas-steam combined cycle cogeneration unit, For electricity price, The calorific value of natural gas. For the density of natural gas, This refers to the price of natural gas.
9. The method for optimizing the pipeline network of a gas-steam combined cycle cogeneration unit according to claim 1, characterized in that, The determination of the optimal steam pipeline network scheme based on the annual comprehensive cost includes: The annual comprehensive cost of steam pipeline network schemes is ranked, and the steam pipeline network scheme with the lowest annual comprehensive cost is selected as the optimal steam pipeline network scheme.
10. An optimized design system for a gas-steam combined cycle cogeneration unit, characterized in that, include: The pipeline cost module is used to construct various steam pipeline schemes. The diameters of different pipe sections in each steam pipeline scheme are different, and the total annual investment cost of each steam pipeline scheme is determined. The steam supply parameter module is used to determine the steam supply parameters of the gas-steam combined cycle cogeneration unit corresponding to each steam pipeline scheme based on the steam parameters at the inlet of each steam pipeline scheme. The heat consumption module is used to establish the bottom steam cycle thermodynamic design model of the gas-steam combined cycle cogeneration unit, determine the bottom steam cycle thermodynamic scheme of each gas-steam combined cycle cogeneration unit based on the steam supply parameters of each gas-steam combined cycle cogeneration unit, and determine the heat consumption of each gas-steam combined cycle cogeneration unit based on the bottom steam cycle thermodynamic scheme. The pipeline optimization module is used to determine the annual operating revenue of the gas-steam combined cycle cogeneration unit based on its heat consumption, and to obtain the annual comprehensive cost of the steam pipeline scheme by combining it with the total annual investment cost. The optimal steam pipeline scheme is then determined based on the annual comprehensive cost.