Steam system pipe network pressure control method, storage medium and electronic equipment

Abstract

The present invention provides a steam system pipe network pressure control method, storage medium and electronic equipment, the method comprising: obtaining process side steam parameters and utility side steam parameters of the steam system; constructing a pressure optimization model based on the process side steam parameters and the utility side steam parameters; inputting the current utility steam flow into the pressure optimization model to obtain a target utility steam flow; obtaining pipe section parameters of each pipe section of the steam system, and constructing a pipe network transportation model based on the pipe section parameters; inputting the target utility steam flow into the pipe network transportation model to obtain a target pipe section pressure drop of each pipe section; and adjusting the pressure of each pipe section according to the target pipe section pressure drop. The implementation of the present invention can realize automatic adjustment of pipe network pressure with high efficiency, and can also achieve global optimal energy-saving effect with low cost.

Description

Technical Field

[0001] The present invention relates to the field of chemical technology, and in particular to a steam system pipe network pressure control method, a storage medium and an electronic device. Background Art

[0002] In large-scale chemical parks, especially those involving multiple industrial chains and multiple production equipment, there are many steam grades involved, and the steam production, use and transportation processes are complex.

[0003] At present, the existing steam system pipeline pressure control method is mainly through manual adjustment by operators based on operating experience.

[0004] In the process of realizing the invention, the inventors found that the existing steam system pipeline pressure control method has the following defects: First, it can only achieve local optimal balance but not global optimal balance, resulting in energy waste, such as optimal within a single production device but not optimal for the entire park; second, the operation adjustment is limited, and the adjustment is subject to the local vent valve pressure, pipeline bearing pressure, user demand pressure, etc., and it is impossible to affect the overall situation through local adjustment; third, it cannot be adjusted automatically, with low efficiency and high cost. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a steam system pipe network pressure control method, storage medium and electronic equipment to achieve automatic adjustment of pipe network pressure with high efficiency, while achieving global optimal energy-saving effect with low cost.

[0006] The technical solution of the present invention provides a steam system pipe network pressure control method, comprising:

[0007] Acquire process-side steam parameters and utility-side steam parameters of the steam system, wherein the utility-side steam parameters include current utility-side steam flow;

[0008] Constructing a pressure optimization model based on the process side steam parameters and the utility side steam parameters;

[0009] Inputting the current utility steam flow into the pressure optimization model to obtain a target utility steam flow;

[0010] Obtaining pipe section parameters of each pipe section of the steam system, and constructing a pipe network transportation model based on the pipe section parameters, wherein the pipe section parameters include current pipe section pressure drop, pipe section geometric parameters, and pipe section pressure restriction conditions;

[0011] Inputting the target utility steam flow into the pipeline network transportation model to obtain the target pipe section pressure drop of each pipe section;

[0012] The pressure of each pipe section is adjusted according to the target pipe section pressure drop.

[0013] Furthermore, the pressure optimization model is constructed based on the process side steam parameters and the utility side steam parameters, including:

[0014] Constructing an objective function for minimizing the global operating cost of the steam system;

[0015] According to the process side steam parameters, the maximum capacity of each device in the steam system, the pipeline transmission flow rate and the upper and lower limit constraints of the system balance are established;

[0016] The minimum value of the objective function is solved according to the steam parameters on the utility side and the upper and lower limit constraints to obtain the pressure optimization model.

[0017] Furthermore, the objective function of constructing the steam system with the lowest global operating cost includes:

[0018] The objective function is constructed using the following formula:

[0019] u=f(x)x=(x 1 ,x 2 ,x 3 ,…,x n )

[0020] Wherein, u is the global operating cost; x is the steam parameter on the utility side;

[0021] The maximum capacity of each device in the steam system, pipeline transport flow and upper and lower limit constraints of system balance are constructed according to the process side steam parameters, including:

[0022] The upper and lower limit constraints are constructed using the following formula:

[0023] g i (x)≤(=,≥)0…i=1,2,3,…,m

[0024] Among them, g i (x) is the functional relationship of each constraint condition.

[0025] Furthermore, the constructing of the pipeline network transportation model based on the pipeline segment parameters includes:

[0026] Obtaining the current pipe section pressure drop of each pipe section;

[0027] Constructing a formula for the total reduced length of pipeline friction according to the pipe section parameters, the current pipe section pressure drop and the target utility steam flow rate;

[0028] The pipeline network transportation model is constructed according to the pipeline segment parameters and the formula of the total converted pipeline friction length.

[0029] Furthermore, the pipe section parameters include the average density of the steam medium, the pipeline friction resistance coefficient and the inner diameter of the pipeline. The formula for constructing the total pipeline friction converted length according to the pipe section parameters, the current pipe section pressure drop and the target utility steam flow rate includes:

[0030] The following formula is used to construct the total reduced length of the pipeline friction:

[0031]

[0032] Among them, L 总 is the total converted length of the pipeline friction, in m; Δρ is the current pipe section pressure drop, in MPa; ρ is the average density, in kg / m3; λ is the pipeline friction resistance coefficient; d is the inner diameter of the pipeline, in mm; v is the average flow velocity of the steam medium, in m / s; Q is the target utility steam flow, in t / h.

[0033] The pipeline network transportation model is constructed according to the pipeline segment parameters and the formula of the total converted pipeline friction length, including:

[0034] The pipeline network transportation model is constructed using the following formula:

[0035]

[0036] Wherein, Δp′ is the target pipe section pressure drop.

[0037] Furthermore, the target utility steam flow is input into the pipe network transport model to obtain the target pipe section pressure drop force of each pipe section, and then the following steps are further included:

[0038] Obtaining pipe section pressure constraint conditions of each pipe section;

[0039] Calculating the target pipe section pressure of each pipe section according to the pipe section pressure constraint condition and the target pipe section pressure drop;

[0040] The step of adjusting the pressure of each pipe section according to the target pipe section pressure drop comprises:

[0041] Obtaining the current pressure setting value of each pipe section;

[0042] The pressure of each pipe section is adjusted according to the current pressure setting value and the target pipe section pressure.

[0043] Further, the adjusting the pressure of each pipe section according to the current pressure setting value and the target pipe section pressure includes:

[0044] If the current pressure setting value is greater than the target pipe section pressure, reducing the current pressure setting value;

[0045] If the current pressure setting value is less than the target pipe section pressure, the current pressure setting value is increased.

[0046] Furthermore, the steam parameters on the process side include the steam production due to reaction heat, the steam consumption of the heat exchanger, the steam consumption for insulation and heating, the steam consumption converted into pipeline loss, and the steam production and consumption of the steam turbine without a spare motor used in the process. The steam parameters on the public works side also include the steam production of the boiler or the purchased steam, the flow rate of the temperature and pressure reducer, the steam production and consumption of the steam turbine with a spare motor used in the process and its standby motor and electrical power, the steam venting volume and the condenser steam flow rate.

[0047] The technical solution of the present invention also provides a storage medium, which stores computer instructions. When a computer executes the computer instructions, it is used to execute all the steps of the steam system pipeline pressure control method as described above.

[0048] The technical solution of the present invention further provides an electronic device, comprising:

[0049] at least one processor; and,

[0050] a memory communicatively connected to the at least one processor; wherein,

[0051] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the steam system pipeline network pressure control method as described above.

[0052] After adopting the above technical scheme, the following beneficial effects are achieved: by obtaining the steam parameters on the process side and the steam parameters on the public engineering side of the steam system, a pressure optimization model is constructed based on the steam parameters on the process side and the steam parameters on the public engineering side, the current public engineering steam flow is input into the pressure optimization model to obtain the target public engineering steam flow, the pipe section parameters of each pipe section of the steam system are obtained, and a pipeline transportation model is constructed based on the pipe section parameters, the target public engineering steam flow is input into the pipeline transportation model to obtain the target pipe section pressure drop of each pipe section, and the pressure of each pipe section is adjusted according to the target pipe section pressure drop, thereby realizing automatic adjustment of the pipeline network pressure with high efficiency, and at the same time achieving the global optimal energy-saving effect with low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0054] Figure 1 A working flow chart of a steam system pipe network pressure control method provided in Embodiment 1 of the present invention;

[0055] Figure 2 A working flow chart of a steam system pipe network pressure control method provided in the second embodiment of the present invention;

[0056] Figure 3 This is a schematic diagram of the structure of a steam system that uses three sets of equipment together;

[0057] Figure 4 A schematic diagram of the hardware structure of an electronic device for controlling the pressure of a steam system pipe network provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0058] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0059] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the invention.

[0060] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0061] Embodiment 1

[0062] like Figure 1 As shown, Figure 1 A working flow chart of a steam system pipe network pressure control method provided in the first embodiment of the present invention includes:

[0063] Step S101: obtaining steam parameters on the process side and steam parameters on the utility side of the steam system;

[0064] Step S102: constructing a pressure optimization model based on process-side steam parameters and utility-side steam parameters;

[0065] Step S103: inputting the current utility steam flow into the pressure optimization model to obtain the target utility steam flow;

[0066] Step S104: acquiring pipe section parameters of each pipe section of the steam system, and constructing a pipe network transportation model based on the pipe section parameters;

[0067] Step S105: inputting the target utility steam flow into the pipe network transportation model to obtain the target pipe section pressure drop of each pipe section;

[0068] Step S106: adjusting the pressure of each pipe section according to the target pipe section pressure drop.

[0069] Specifically, first, execute step S101 to obtain the process side steam parameters and the utility side steam parameters of the steam system. The process side steam parameters are the steam parameters of points whose flow cannot be freely adjusted, such as process waste heat by-product steam, process consumption steam, and steam for driving process steam turbine equipment. The utility side steam parameters are the steam parameters of points whose flow can be freely changed, such as coal-fired / gas-fired furnace steam production, temperature and pressure reducer, extraction condensing steam turbine, and steam turbine-driven moving equipment with electric drive standby machine. The utility side steam parameters include the current utility steam flow.

[0070] Secondly, step S102 is performed to construct a pressure optimization model based on the process side steam parameters and the utility side steam parameters, and the pressure optimization model is used to optimize the pressure of the steam system pipe network. Preferably, the pressure optimization model includes a linear programming model, a nonlinear programming model, a mixed integer linear programming model, a mixed integer nonlinear programming model, etc.

[0071] Next, execute step S103 to input the current utility steam flow into the pressure optimization model to obtain the target utility steam flow, which is the global optimal utility steam flow. Preferably, the current utility steam flow can be input into the pressure optimization model using a simplex method, a cyclic iteration method, a particle swarm algorithm, a genetic algorithm, or the like, to solve the pressure optimization model and obtain the optimized target utility steam flow.

[0072] Next, execute step S104 to obtain the pipe section parameters of each pipe section of the steam system, and construct a pipeline network transportation model based on the pipe section parameters. The pipe section parameters include the current pipe section pressure drop, pipe section geometric parameters and pipe section pressure limit conditions. The pipe section pressure drop of each pipe section can be calculated through the pipeline network transportation model.

[0073] Then, step S105 is executed to input the target utility steam flow into the pipeline network transportation model to obtain the target pipeline section pressure drop of each pipeline section.

[0074] Finally, step S106 is executed to adjust the pressure of each pipe section according to the target pipe section pressure drop to achieve automatic adjustment of the pipe network pressure.

[0075] According to an embodiment of the present invention, by acquiring process-side steam parameters and utility-side steam parameters of a steam system, a pressure optimization model is constructed based on the process-side steam parameters and the utility-side steam parameters, the current utility-side steam flow is input into the pressure optimization model to obtain a target utility-side steam flow, the pipe section parameters of each pipe section of the steam system are acquired, and a pipeline network transportation model is constructed based on the pipe section parameters, the target utility-side steam flow is input into the pipeline network transportation model to obtain a target pipe section pressure drop of each pipe section, and the pressure of each pipe section is adjusted according to the target pipe section pressure drop, thereby realizing automatic adjustment of the pipeline network pressure with high efficiency, and achieving a globally optimal energy-saving effect with low cost.

[0076] In one embodiment, the steam parameters on the process side include the steam production due to reaction heat, the steam consumption of the heat exchanger, the steam consumption for insulation and heating, the steam consumption converted into pipeline loss, and the steam production and consumption of the steam turbine without a spare motor used in the process. The steam parameters on the public works side also include the steam production of the boiler or the purchased steam, the flow rate of the temperature and pressure reducer, the steam production and consumption of the steam turbine with a spare motor used in the process and its standby motor and electrical power, the steam venting volume and the condenser steam flow rate.

[0077] Embodiment 2

[0078] like Figure 2 As shown, Figure 2 A working flow chart of a steam system pipe network pressure control method provided in the second embodiment of the present invention includes:

[0079] Step S201: obtaining steam parameters on the process side and steam parameters on the utility side of the steam system;

[0080] Step S202: constructing an objective function for minimizing the global operating cost of the steam system;

[0081] Step S203: constructing upper and lower limit constraints of the maximum capacity of each device in the steam system, pipeline transport flow and system balance according to the process side steam parameters;

[0082] Step S204: solving the minimum value of the objective function according to the steam parameters on the utility side and the upper and lower limit constraints to obtain a pressure optimization model;

[0083] Step S205: inputting the current utility steam flow into the pressure optimization model to obtain the target utility steam flow;

[0084] Step S206: obtaining pipe section parameters of each pipe section of the steam system;

[0085] Step S207: obtaining the current pipe section pressure drop of each pipe section;

[0086] Step S208: constructing a formula for the total reduced length of pipeline friction according to the pipe section parameters, the current pipe section pressure drop and the target utility steam flow rate;

[0087] Step S209: constructing a pipeline network transportation model according to the pipeline segment parameters and the formula of the total converted pipeline friction length;

[0088] Step S210: inputting the target utility steam flow into the pipe network transportation model to obtain the target pipe section pressure drop of each pipe section;

[0089] Step S211: obtaining the pipe section pressure constraint conditions of each pipe section;

[0090] Step S212: Calculate the target pipe section pressure of each pipe section according to the pipe section pressure constraint condition and the target pipe section pressure drop;

[0091] Step S213: obtaining the current pressure setting value of each pipe section;

[0092] Step S214: determining whether the current pressure setting value is greater than the target pipe section pressure;

[0093] Step S215: reducing the current pressure setting value;

[0094] Step S216: Increase the current pressure setting value.

[0095] Specifically, step S202 constructs an objective function for minimizing the global operating cost of the steam system, and the global operating cost includes the fuel cost of coal-fired / gas-fired boilers, boiler water cost, electric drive equipment cost, externally purchased steam cost, and the benefits generated by the external sale of condensate. Step S214 determines whether the current pressure setting value is greater than the target pipe section pressure. If so, step S215 is executed to reduce the current pressure setting value of the pressure regulating device, otherwise, step S216 is executed. Preferably, the pressure regulating device includes a pressure reducing valve, a steam extraction valve, a vent valve, and a steam introduction valve.

[0096] Preferably, the pipeline section pressure constraint conditions include the pressure limit of the pipeline section vent valve, the pressure limit of the steam user demand, the pressure limit of the pipeline safety valve, and as few pressure fluctuation points as possible.

[0097] According to an embodiment of the present invention, by acquiring process-side steam parameters and utility-side steam parameters of a steam system, a pressure optimization model is constructed based on the process-side steam parameters and the utility-side steam parameters, the current utility-side steam flow is input into the pressure optimization model to obtain a target utility-side steam flow, the pipe section parameters of each pipe section of the steam system are acquired, and a pipeline network transportation model is constructed based on the pipe section parameters, the target utility-side steam flow is input into the pipeline network transportation model to obtain a target pipe section pressure drop of each pipe section, and the pressure of each pipe section is adjusted according to the target pipe section pressure drop, thereby realizing automatic adjustment of the pipeline network pressure with high efficiency, and achieving a globally optimal energy-saving effect with low cost.

[0098] In one embodiment, in order to facilitate the establishment of a pressure optimization model, step S202 includes:

[0099] The objective function is constructed using the following formula:

[0100] u=f(x)x=(x 1 ,x 2 ,x 3 ,…,x n )

[0101] Among them, u is the global operating cost; x is the steam parameter on the utility side;

[0102] Step S203 includes:

[0103] The following formulas are used to construct the upper and lower limit constraints:

[0104] g i (x)≤(=,≥)0…i=1,2,3,…,m

[0105] Among them, g i (x) is the functional relationship of each constraint condition.

[0106] In one embodiment, in order to facilitate the construction of a pipeline network transportation model, the pipeline section parameters include the average density of the steam medium, the pipeline friction resistance coefficient and the pipeline inner diameter. Step S208 includes:

[0107] The following formula is used to construct the total reduced length of pipeline friction:

[0108]

[0109] Among them, L 总 is the total converted length of pipeline friction, in m; Δp is the current pipe section pressure drop, in MPa; ρ is the average density, in kg / m3; λ is the pipeline friction resistance coefficient; d is the inner diameter of the pipeline, in mm; v is the average flow velocity of the steam medium, in m / s; Q is the target utility steam flow, in t / h.

[0110] Step S209 includes:

[0111] The following formula is used to construct the pipeline network transportation model:

[0112]

[0113] Wherein, Δp′ is the target pipe section pressure drop.

[0114] The following uses a steam system used by three sets of devices as an example to illustrate the use of the steam system pipe network control method provided by the present invention, as follows:

[0115] like Figure 3 As shown, Figure 3 The following is a simplified diagram of the steam system balance.

[0116] First, obtain the steam parameters of the system process side and the utility side, such as Figure 3 As shown in the mark, the meanings of the symbols are as follows:

[0117] ① Byproduct steam, for example: P-18-A1 byproduct S18 grade steam, numbered A1;

[0118] ② Purchased steam, for example: B-4-A11 purchases S4 grade steam, numbered A11;

[0119] ③External steam delivery, for example: O-10-A5 externally delivers S10 grade steam, numbered A5;

[0120] ④ Steam decompression, for example: V-18 / 10-A4 is decompressed from S18 to S10 steam, numbered A4;

[0121] ⑤ Consume steam, for example: E-18-A2 consumes S18 grade steam, numbered A2;

[0122] ⑥ Steam inlet to the turbine, for example: Tuin-98-B2 turbine inlet S98 grade steam, numbered B2;

[0123] ⑦ Steam extraction from steam turbine, for example: Tuout-4-B3 steam turbine extracts S4 grade steam, numbered as B3;

[0124] ⑧ Steam turbine condensate, for example: SC-B4 steam turbine condensate, numbered B4.

[0125] Secondly, a pressure optimization model was established with the steam parameters on the process side as fixed values, the steam parameters on the utility side as variables, the minimum global operating cost as the objective function, the maximum capacity of the equipment, the pipeline transportation flow rate and the system balance as the upper and lower limit constraints.

[0126] The objective function is:

[0127] u=F (B-98-B1) *Price S98 +(F (B-10-C10) -F (O-10-A5) )*Price S10 -

[0128] F (SC-B4) *Price S98 Formula (1)

[0129] The upper and lower limit constraints are:

[0130] ①S4 pipe network mass balance;

[0131] ②S10 pipe network mass balance;

[0132] ③The steam turbine power remains unchanged;

[0133] ④ The upper and lower limits of the S4 steam extraction volume of the steam turbine;

[0134] ⑤ Upper and lower limits of steam transport volume in pipelines.

[0135] Next, the system is optimized and calculated under certain working conditions at a certain time, and the target utility steam flow rates of each utility side before and after optimization are shown in Table 1 below:

[0136] Table 1

[0137]

[0138]

[0139] Next, establish the S4 steam system pipeline transportation model:

[0140]

[0141]

[0142]

[0143] Device A pipe network pressure P S4-A It is controlled by the pressure setting value of the pressure reducing valve and is limited by the pressure demand value of the user. If the pressure is too low, the heat exchange area of ​​the heat exchanger will be insufficient.

[0144] Device B pipe network pressure P S4-B Controlled by the extraction steam pressure setting value and limited by the vent valve pressure setting value, it will vent if the pressure is too high;

[0145] Device C pipe network pressure P S4-C It is controlled by the pressure setting value of the pressure reducing valve and is limited by the pressure demand value of the user. If the pressure is too low, the heat exchange area of ​​the heat exchanger will be insufficient.

[0146] Device B to Device A:

[0147] Under this condition, P S4-B =0.436MPa, P S4-A =0.348MPa, calculated to get L 总A-B =2500m; Substituting the optimized flow parameters into the above formula (2), the target pipe section pressure drop is obtained to be 106kPa;

[0148] Device B to Device C:

[0149] Under this condition, P S4-B =0.436MPa, P S4-C=0.335MPa, calculated to get L 总B-C =2900m; Substituting the optimized flow parameters into the above formula (2), the target pipe section pressure drop is obtained to be 110kPa;

[0150] Then, the pipe section pressure constraint conditions of each pipe section are obtained: according to the pipe network pressure constraint conditions, the pipe network pressure of device B is close to the vent valve setting pressure, the pipe network pressure of device A is greater than the user demand pressure, and the pipe network pressure of device C is close to the user demand pressure. In this case, the pressure setting value of the pressure reducing valve of device A has adjustment space, while the steam extraction pressure setting value of device B and the pressure reducing valve pressure setting value of device C do not have adjustment space.

[0151] Finally, the output adjustment value P VS10 / S4-A =0.33MPa, transmitted to the pressure reducing valve controller of device A for automatic adjustment. After the adjustment is completed, the actual utility steam flow rate on each utility side is shown in Table 2 below:

[0152] Table 2

[0153] Point Before adjustment t / h After adjustment t / h <![CDATA[F (O-10-A5) ]]> 62 82 <![CDATA[F (V-10 / 4-A7) ]]> 20 0 <![CDATA[F (B-4-A11) ]]> 0 20 <![CDATA[F (O-4-B8) ]]> 35 55 <![CDATA[F (Tuin-98-B2) ]]> 173 179 <![CDATA[F (Tuout-4-B3) ]]> 65 85 <![CDATA[F (SC-B4) ]]> 108 94 <![CDATA[F (B-10-C10) ]]> 10 10 <![CDATA[F (V-10 / 4-C6) ]]> 21 21 <![CDATA[F (B-4-C11) ]]> 65 65

[0154] It can be seen from Table 2 and Table 1 above that the actual utility steam flow rate on each utility side using the steam system pipe network pressure control method provided by the present invention can be consistent with the target utility steam flow rate on each utility side after optimization.

[0155] Embodiment 3

[0156] Embodiment 3 of the present invention provides a storage medium, which is used to store computer instructions. When a computer executes the computer instructions, it is used to execute all steps of the steam system pipeline pressure control method in any of the method embodiments described above.

[0157] Embodiment 4

[0158] like Figure 4 As shown, a hardware structure diagram of an electronic device for controlling the pressure of a steam system pipe network provided by Embodiment 4 of the present invention includes:

[0159] at least one processor 401; and,

[0160] A memory 402 is communicatively connected to at least one processor 401; wherein,

[0161] The memory 402 stores instructions that can be executed by at least one processor 401. The instructions are executed by at least one processor 401 so that the at least one processor 401 can execute the steam system pipe network pressure control method as described above.

[0162] Figure 4A processor 401 is taken as an example.

[0163] The electronic device is preferably an Electronic Control Unit (ECU).

[0164] The electronic device may further include: an input device 403 and an output device 404 .

[0165] The processor 401, the memory 402, the input device 403 and the output device 404 may be connected via a bus or other means, and the figure takes the connection via a bus as an example.

[0166] The memory 402 is a non-volatile computer-readable storage medium that can be used to obtain non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the steam system pipe network pressure control method in the embodiment of the present application, for example, Figure 1-Figure 2 The processor 401 executes various functional applications and data processing by running the non-volatile software programs, instructions and modules acquired in the memory 402, that is, the steam system pipe network pressure control method in the above embodiment is implemented.

[0167] The memory 402 may include an acquisition program area and an acquisition data area, wherein the acquisition program area may acquire an operating system and an application required by at least one function; the acquisition data area may acquire data created according to the use of the steam system pipe network pressure control method, etc. In addition, the memory 402 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 402 may optionally include a memory remotely arranged relative to the processor 401, and these remote memories may be connected to the device for executing the steam system pipe network pressure control method via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0168] The input device 403 can receive input user clicks and generate signal inputs related to user settings and function control of the steam system pipe network pressure control method. The output device 404 can include display devices such as display screens.

[0169] The one or more modules are acquired in the memory 402, and when being run by the one or more processors 401, the steam system pipe network pressure control method in any of the above method embodiments is executed.

[0170] The above-mentioned product can execute the method provided in the embodiment of the present application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the method provided in the embodiment of the present application.

[0171] The electronic devices of the embodiments of the present invention exist in various forms, including but not limited to:

[0172] (1) Electronic Control Unit (ECU) is also called "driving computer" or "on-board computer". It is mainly composed of microprocessor (CPU), memory (ROM, RAM), input / output interface (I / O), analog-to-digital converter (A / D) and large-scale integrated circuits such as shaping and driving.

[0173] (2) Mobile communication devices: These devices are characterized by their mobile communication functions and their main purpose is to provide voice and data communications. These terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.

[0174] (3) Ultra-mobile personal computer devices: These devices belong to the category of personal computers, have computing and processing functions, and generally also have mobile Internet access features. These terminals include: PDA, MID and UMPC devices, etc.

[0175] (4) Portable entertainment devices: These devices can display and play multimedia content. They include audio and video players (such as iPods), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.

[0176] (5) Server: A device that provides computing services. The server consists of a processor, hard disk, memory, system bus, etc. The server is similar to the general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, manageability, etc.

[0177] (6) Other electronic devices with data interaction functions.

[0178] In addition, the logic instructions in the above-mentioned memory 402 can be implemented in the form of a software functional unit and can be obtained in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is obtained in a storage medium, including a number of instructions to enable a mobile terminal (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can obtain program code.

[0179] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiments of the present invention. Those of ordinary skill in the art may understand and implement them without creative effort.

[0180] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be obtained in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0181] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, rather than to limit them. Although the embodiments of the present invention have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steam system pipe network pressure control method, characterized in that: include: Acquire process-side steam parameters and utility-side steam parameters of the steam system, wherein the utility-side steam parameters include current utility-side steam flow; A pressure optimization model is constructed based on the process-side steam parameters and the utility-side steam parameters: an objective function for minimizing the global operating cost of the steam system is constructed; upper and lower limit constraints of the maximum capacity of each device in the steam system, pipeline transport flow, and system balance are constructed based on the process-side steam parameters; the minimum value of the objective function is solved based on the utility-side steam parameters and the upper and lower limit constraints to obtain the pressure optimization model; Inputting the current utility steam flow into the pressure optimization model to obtain a target utility steam flow; Obtain the pipe section parameters of each pipe section of the steam system, and construct a pipe network transportation model based on the pipe section parameters, wherein the pipe section parameters include current pipe section pressure drop, pipe section geometric parameters and pipe section pressure restriction conditions: obtain the current pipe section pressure drop of each pipe section; construct a formula for the total converted length of pipeline friction according to the pipe section parameters, the current pipe section pressure drop and the target utility steam flow; construct the pipe network transportation model according to the pipe section parameters and the formula for the total converted length of pipeline friction; Inputting the target utility steam flow into the pipeline network transportation model to obtain the target pipe section pressure drop of each pipe section; The pressure of each pipe section is adjusted according to the target pipe section pressure drop.

2. The steam system pipe network pressure control method according to claim 1, characterized in that: The objective function for constructing the steam system with the lowest global operating cost includes: The objective function is constructed using the following formula: u=f(x)x=(x1,x2,x3,…,x n ) Wherein, u is the global operating cost; x is the current utility steam flow; The maximum capacity of each device in the steam system, pipeline transport flow and upper and lower limit constraints of system balance are constructed according to the process side steam parameters, including: The upper and lower limit constraints are constructed using the following formula: g i (x)≤(=,≥)0…i=1,2,3,…,m Among them, g i (x) is the functional relationship of each constraint condition.

3. The steam system pipe network pressure control method according to claim 1, characterized in that: The pipe section parameters include the average density of the steam medium, the pipeline friction resistance coefficient and the inner diameter of the pipeline. The formula for constructing the total pipeline friction converted length according to the pipe section parameters, the current pipe section pressure drop and the target utility steam flow rate includes: The following formula is used to construct the total reduced length of the pipeline friction: Among them, L 总 is the total converted length of the pipeline friction, in m; Δp is the current pipe section pressure drop, in MPa; ρ is the average density, in kg / m3; λ is the pipeline friction resistance coefficient; d is the inner diameter of the pipeline, in mm; v is the average flow velocity of the steam medium, in m / s; Q is the target utility steam flow, in t / h; The pipeline network transportation model is constructed according to the pipeline segment parameters and the formula of the total converted pipeline friction length, including: The pipeline network transportation model is constructed using the following formula: Among them, Δp ′ is the target pipe section pressure drop.

4. The method for controlling the pressure of a steam system pipe network according to any one of claims 1 to 3, characterized in that: The target utility steam flow is input into the pipeline network transport model to obtain the target pipe section pressure drop force of each pipe section, and then further includes: Obtaining pipe section pressure constraint conditions of each pipe section; Calculating the target pipe section pressure of each pipe section according to the pipe section pressure constraint condition and the target pipe section pressure drop; The step of adjusting the pressure of each pipe section according to the target pipe section pressure drop comprises: Obtaining the current pressure setting value of each pipe section; The pressure of each pipe section is adjusted according to the current pressure setting value and the target pipe section pressure.

5. The steam system pipe network pressure control method according to claim 4, characterized in that: The step of adjusting the pressure of each pipe section according to the current pressure setting value and the target pipe section pressure includes: If the current pressure setting value is greater than the target pipe section pressure, reducing the current pressure setting value; If the current pressure setting value is less than the target pipe section pressure, the current pressure setting value is increased.

6. The method for controlling the pressure of a steam system pipe network according to claim 1, characterized in that: The steam parameters on the process side include the steam production due to reaction heat, the steam consumption of the heat exchanger, the steam consumption for insulation and heating, the steam consumption converted into pipeline loss, and the steam production and consumption of the steam turbine without a spare motor used in the process. The steam parameters on the public works side also include the steam production of the boiler or the purchased steam, the flow rate of the temperature and pressure reducer, the steam production and consumption of the steam turbine with a spare motor used in the process and its standby motor and electrical power, the steam venting volume and the condenser steam flow rate.

7. A storage medium, characterized in that: The storage medium stores computer instructions, and when a computer executes the computer instructions, it is used to execute all steps of the steam system pipeline network pressure control method according to any one of claims 1 to 6.

8. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the steam system pipeline pressure control method as described in any one of claims 1-6.

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