An optimization combination method and system for a liquefied natural gas gasification production line

Abstract

The present invention discloses an optimized combination method and system for a liquefied natural gas gasification production line, relating to the technical field of liquefied natural gas gasification. The method includes: obtaining the first, second, third, and fourth quantities in a target liquefied natural gas receiving station; calculating the functional relationships between the first, second, third, and fourth quantities and the gasification and external transmission volume of the target liquefied natural gas receiving station to obtain the first, second, third, and fourth functional relationships; obtaining a combined functional relationship according to a preset production load logical relationship; obtaining the current real-time gasification and external transmission volume of the target liquefied natural gas receiving station; and obtaining a real-time production equipment management plan according to the combined functional relationship to carry out liquefied natural gas gasification production. The present invention solves the technical problem that the utilization rate of the gasification production line in most liquefied natural gas receiving stations is not high during the non-guaranteed supply period in the prior art, and achieves the technical effect of realizing the overall energy-saving and efficient operation of the liquefied natural gas receiving station.

Description

Technical Field

[0001] The present invention relates to the technical field of liquefied natural gas gasification, and particularly to an optimized combination method and system for a liquefied natural gas gasification production line. Background Art

[0002] Liquefied Natural Gas (LNG) is natural gas at -162°C under normal pressure, and its main component is methane. Liquefied natural gas is colorless, odorless, non-toxic and non-corrosive. Its volume is about 1 / 625 of the volume of the equivalent gaseous natural gas, and its density is about 45% of that of water. It is an ideal clean energy source.

[0003] As a new type of energy, liquefied natural gas has the advantages of large transportation volume and low transportation cost, and is rapidly occupying the global energy market. At present, various large-scale liquefied natural gas receiving stations are being built in full swing in China, and the gasification process of liquefied natural gas has also become a research hotspot.

[0004] At present, most of the liquefied natural gas receiving stations built in China are mainly used for gasification peak shaving and play a significant role during the winter supply guarantee period. However, during the non-supply guarantee period, the utilization rate of the gasification production line is not high, and there are some deficiencies in the operation combination of the gasification device. Excessive energy consumption and high unit consumption have become the primary problems, resulting in a waste of electric energy while using this clean energy source of natural gas.

[0005] In the prior art, most liquefied natural gas receiving stations have the technical problem that the utilization rate of the gasification production line is not high during the non-supply guarantee period due to deficiencies in the gasification process. Summary of the Invention

[0006] The purpose of the present application is to provide an optimized combination method and system for a liquefied natural gas gasification production line to solve the technical problem that the utilization rate of the gasification production line is not high in most liquefied natural gas receiving stations in the prior art during the non-supply guarantee period.

[0007] In view of the above problems, the present application provides an optimized combination method and system for a liquefied natural gas gasification production line.

[0008] In a first aspect, the present application provides an optimized combination method for a liquefied natural gas gasification production line. The method includes: obtaining the number of liquefied natural gas high-pressure pumps, the number of seawater pumps, the number of boil-off gas compressors, and the number of liquefied natural gas low-pressure pumps in a target liquefied natural gas receiving station to obtain a first quantity, a second quantity, a third quantity, and a fourth quantity; calculating the functional relationships between the first quantity, the second quantity, the third quantity, and the fourth quantity and the gasification and external transportation volume of the target liquefied natural gas receiving station to obtain a first functional relationship, a second functional relationship, a third functional relationship, and a fourth functional relationship; obtaining a preset production load logical relationship, and calculating in accordance with the preset production load logical relationship and combining the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship to obtain a combined functional relationship; obtaining the current real-time gasification and external transportation volume of the target liquefied natural gas receiving station; inputting the real-time gasification and external transportation volume into the combined functional relationship to obtain a real-time production equipment management plan, and the target liquefied natural gas receiving station uses the real-time production equipment management plan for liquefied natural gas gasification production.

[0009] In a second aspect, the present application further provides an optimized combination system for a liquefied natural gas gasification production line, which is used to execute an optimized combination method for a liquefied natural gas gasification production line as described in the first aspect. Among them, the system includes: an equipment quantity acquisition module, which is used to obtain the number of liquefied natural gas high-pressure pumps, the number of seawater pumps, the number of boil-off gas compressors, and the number of liquefied natural gas low-pressure pumps in a target liquefied natural gas receiving station to obtain a first quantity, a second quantity, a third quantity, and a fourth quantity; a functional relationship calculation module, which is used to calculate the functional relationships between the first quantity, the second quantity, the third quantity, and the fourth quantity and the gasification and external transportation volume of the target liquefied natural gas receiving station to obtain a first functional relationship, a second functional relationship, a third functional relationship, and a fourth functional relationship; a combined functional relationship acquisition module, which is used to obtain a preset production load logical relationship and calculate in accordance with the preset production load logical relationship and combine the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship to obtain a combined functional relationship; a real-time gasification and external transportation volume acquisition module, which is used to obtain the current real-time gasification and external transportation volume of the target liquefied natural gas receiving station; a production equipment management module, which inputs the real-time gasification and external transportation volume into the combined functional relationship to obtain a real-time production equipment management plan, and the target liquefied natural gas receiving station uses the real-time production equipment management plan for liquefied natural gas gasification production.

[0010] One or more technical solutions provided in the present application have at least the following technical effects or advantages:

[0011] The technical solution provided by this application obtains the number of liquefied natural gas high-pressure pumps, the number of seawater pumps, the number of boil-off gas compressors, and the number of liquefied natural gas low-pressure pumps in the target liquefied natural gas receiving station to obtain the first quantity, the second quantity, the third quantity, and the fourth quantity; calculates the functional relationships between the first quantity, the second quantity, the third quantity, and the fourth quantity and the gasification and external transportation volume of the target liquefied natural gas receiving station to obtain the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship; obtains the preset production load logical relationship, and performs calculations in combination with the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship according to the preset production load logical relationship to obtain the combined functional relationship; obtains the current real-time gasification and external transportation volume of the target liquefied natural gas receiving station; inputs the real-time gasification and external transportation volume into the combined functional relationship to obtain the real-time production equipment management plan, and the target liquefied natural gas receiving station adopts the real-time production equipment management plan for liquefied natural gas gasification production. This application proposes an optimization combination method for a liquefied natural gas gasification production line, which makes full use of the excessive cold energy of liquefied natural gas itself to reliquefy the boil-off gas, calculates the required liquefied natural gas flow rate and seawater flow rate based on the gasification volume at different levels, and fits the optimal production line equipment combination method by the lowest total power consumption method of the production line, realizing the operation mode of optimizing the combination of the liquefied natural gas gasification production line, effectively reducing the power consumption of the low-pressure pump, high-pressure pump, seawater pump transmission line, and boil-off gas compression unit, reducing the gasification unit consumption of the liquefied natural gas gasification production line, achieving the technical effect of reducing the number of operating power-consuming equipment and realizing the energy-saving and efficient operation of the liquefied natural gas receiving station.

[0012] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of this application more obvious and understandable, the following specifically describes the specific embodiments of this application. Brief Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0014] Figure 1 It is a schematic flowchart of an optimization combination method for a liquefied natural gas gasification production line provided by an embodiment of this application;

[0015] Figure 2 It is a graph of the fluctuation range of the number of liquefied natural gas high-pressure pumps started in an optimization combination method for a liquefied natural gas gasification production line provided by an embodiment of this application;

[0016] Figure 3 It is a graph of the fluctuation range of the number of seawater pumps started in an optimized combination method for a liquefied natural gas gasification production line provided by an embodiment of the present application;

[0017] Figure 4 It is a graph of the fluctuation range of the number of evaporative gas compressors started in an optimized combination method for a liquefied natural gas gasification production line provided by an embodiment of the present application;

[0018] Figure 5 It is a graph of the fluctuation range of the number of liquefied natural gas low-pressure pumps started in an optimized combination method for a liquefied natural gas gasification production line provided by an embodiment of the present application;

[0019] Figure 6 It is a graph of the fluctuation range of the total power of the receiving station in an optimized combination method for a liquefied natural gas gasification production line provided by an embodiment of the present application;

[0020] Figure 7 It is a schematic structural diagram of an optimized combination system for a liquefied natural gas gasification production line provided by an embodiment of the present application;

[0021] Figure 8 It is a schematic structural diagram of an exemplary electronic device of the present application.

[0022] Explanation of reference numerals: Equipment quantity acquisition module 11, function relationship calculation module 12, combined function relationship acquisition module 13, real-time gasification and external output quantity acquisition module 14, production equipment management module 15, electronic device 300, memory 301, processor 302, communication interface 303, bus architecture 304. Detailed implementation manners

[0023] The present application provides an optimized combination method and system for a liquefied natural gas gasification production line to solve the technical problem that the utilization rate of the gasification production line in most liquefied natural gas receiving stations is not high during the non-guaranteed supply period in the prior art.

[0024] In the technical solution of the present application, the acquisition, storage, use, processing, etc. of data all comply with the relevant regulations of national laws and regulations.

[0025] Next, the technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the example embodiments described herein. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application. Additionally, it should be noted that for the sake of description, only the parts related to the present application are shown in the accompanying drawings rather than all.

[0026] Example 1

[0027] As Figure 1 shown, the present application provides an optimized combination method for a liquefied natural gas gasification production line, and the method includes:

[0028] S100: Obtain the number of liquefied natural gas high-pressure pumps, the number of seawater pumps, the number of boil-off gas compressors, and the number of liquefied natural gas low-pressure pumps in the target liquefied natural gas receiving station to obtain a first quantity, a second quantity, a third quantity, and a fourth quantity;

[0029] Specifically, the target liquefied natural gas receiving station is a liquefied natural gas receiving station that needs production equipment management. A liquefied natural gas receiving station refers to a transfer hub that receives liquefied natural gas (LNG) transported by seagoing ships, stores it, and then regasifies and transports it to users. It is equipped with liquefied natural gas storage tanks, low-pressure pumps, boil-off gas (BOG) low-pressure compressors, boil-off gas high-pressure compressors, boil-off gas main pipes, recondensers, tanker filling systems, high-pressure pumps, seawater pumps, seawater open rack vaporizers (ORVs), flares, natural gas export pipelines, boil-off gas return to the ship for replenishment and other devices. Obtain the number of liquefied natural gas high-pressure pumps, the number of seawater pumps, the number of boil-off gas compressors, and the number of liquefied natural gas low-pressure pumps in the target liquefied natural gas receiving station to obtain a first quantity, a second quantity, a third quantity, and a fourth quantity. Taking a liquefied natural gas receiving station as an example, this receiving station has a total of 6 production lines, and the core equipment of the production line includes 2 sets of boil-off gas low-pressure compressor units, 6 sets of liquefied natural gas high-pressure pumps, 12 sets of liquefied natural gas low-pressure pumps, and 5 sets of seawater pumps.

[0030] S200: Calculate the functional relationships between the first quantity, the second quantity, the third quantity, the fourth quantity and the gasification and export volume of the target liquefied natural gas receiving station to obtain a first functional relationship, a second functional relationship, a third functional relationship, and a fourth functional relationship;

[0031] Specifically, according to the rated flow rate and rated power of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump in the target liquefied natural gas receiving station, calculate the functional relationships between the first quantity, second quantity, third quantity, and fourth quantity and the gasification and external transportation volume of the target liquefied natural gas receiving station. Briefly speaking, when the operating quantities of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump are different, the gasification and external transportation volume of the target liquefied natural gas receiving station is also different. Taking the operating quantities of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump as the vertical coordinates and the gasification and external transportation volume of the target liquefied natural gas receiving station as the horizontal coordinates, four rectangular coordinate systems can be established respectively to represent the functional relationships between the operating quantities of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump and the gasification and external transportation volume of the target liquefied natural gas receiving station, and then obtain the first functional relationship, second functional relationship, third functional relationship, and fourth functional relationship.

[0032] S300: Obtain the preset production load logical relationship, and calculate according to the preset production load logical relationship in combination with the first functional relationship, second functional relationship, third functional relationship, and fourth functional relationship to obtain the combined functional relationship;

[0033] Specifically, obtain the preset production load logical relationship. The preset production load logical relationship includes the logical relationship satisfied by the optimal operating load, and the operating load is related to the operating quantities of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump. Calculate according to the preset production load logical relationship in combination with the first functional relationship, second functional relationship, third functional relationship, and fourth functional relationship to obtain the combined functional relationship. The combined functional relationship includes the functional relationships of the production line operating quantity, the operating quantities of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, liquefied natural gas low-pressure pump, gasification and external transportation volume, and total load.

[0034] S400: Obtain the current real-time gasification and external transportation volume of the target liquefied natural gas receiving station;

[0035] Specifically, the combined functional relationship is obtained in step S300. In the combined functional relationship, different gasification and external transportation volumes correspond to different production line operating quantities, and the operating quantities of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump. Obtain the current real-time gasification and external transportation volume of the target liquefied natural gas receiving station, and then obtain the real-time production equipment management plan according to the real-time gasification and external transportation volume.

[0036] S500: Input the real-time gasification and external transportation volume into the combined functional relationship to obtain the real-time production equipment management plan, and the target liquefied natural gas receiving station uses the real-time production equipment management plan for liquefied natural gas gasification production.

[0037] Specifically, by inputting the real-time gasification and external transportation volume into the combined functional relationship, the corresponding number of operating production lines, the number of operating liquefied natural gas high-pressure pumps, the number of operating seawater pumps, the number of operating boil-off gas compressors, and the number of operating liquefied natural gas low-pressure pumps can be obtained. Furthermore, a production equipment management plan can be obtained. The target liquefied natural gas receiving terminal adopts the real-time production equipment management plan to turn on or off relevant equipment, thereby carrying out liquefied natural gas gasification production. By combining the operation of different numbers of high-pressure pumps, seawater pumps, high-pressure pumps, and boil-off gas low-pressure compressors, the unit power consumption for external transportation gasification is reduced, and the overall energy-saving and efficient operation of the liquefied natural gas receiving terminal is achieved.

[0038] Furthermore, calculate the functional relationships between the first quantity, the second quantity, the third quantity, the fourth quantity, and the gasification and external transportation volume of the target liquefied natural gas receiving terminal. Step S200 in the method provided by the embodiments of the present application includes:

[0039] S210: Obtain the rated flow rates of a single liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump, and obtain a first rated flow rate, a second rated flow rate, a third rated flow rate, and a fourth rated flow rate;

[0040] S220: Obtain the rated powers of a single liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump, and obtain a first rated power, a second rated power, a third rated power, and a fourth rated power;

[0041] S230: According to the first rated flow rate, the second rated flow rate, the third rated flow rate, the fourth rated flow rate, as well as the first rated power, the second rated power, the third rated power, and the fourth rated power, calculate the functional relationships between the gasification and external transportation volume and the first quantity, the second quantity, the third quantity, and the fourth quantity, and obtain the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship.

[0042] Specifically, obtain the rated flow rates and rated powers of a single liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump. The rated flow rate refers to the volume of liquid (or gas) transported per unit time, and the rated power refers to the power when each device is working normally. Furthermore, obtain a first rated flow rate, a second rated flow rate, a third rated flow rate, a fourth rated flow rate, a first rated power, a second rated power, a third rated power, and a fourth rated power. According to the rated flow rate and the rated power, calculate the functional relationships between the gasification and external transportation volume and the first quantity, the second quantity, the third quantity, and the fourth quantity, and further obtain the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship.

[0043] For example, take a liquefied natural gas receiving terminal as an example. The receiving terminal has a total of 6 production lines. The core equipment of the production lines includes 2 sets of boil-off gas low-pressure compressor units, 6 sets of liquefied natural gas high-pressure pumps, 12 sets of liquefied natural gas low-pressure pumps, and 5 sets of seawater pumps, with a total installed capacity of 18,586 kW. The main energy-consuming equipment for the production operation of the receiving terminal is located in the low-pressure liquefied natural gas system, high-pressure transmission system, boil-off gas treatment system, and seawater pump system. The rated flow rates of the low-pressure pump, high-pressure pump, seawater pump, and low-pressure compressor are respectively: 350 m 3 / h, 424 m 3 / h, 6,850 m 3 / h, 11,900 Nm 3 / h, and the rated powers are 210 kW, 1,796 kW, 710 kW, and 870 kW respectively. According to the rated flow rate and rated power, calculate the functional relationships between the gasification and external transmission volume and the operating quantities of the low-pressure pump, high-pressure pump, seawater pump, and low-pressure compressor, and obtain the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship. As shown in Figure 2 , Figure 3 , Figure 4 , Figure 5 , they are the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship respectively.

[0044] Furthermore, the logic relationship for obtaining the preset production load in step S300 of the embodiment of the present application is as follows:

[0045] min z = 1,796α + 710β + 870γ + 210δ

[0046]

[0047] where z is the total load of the target liquefied natural gas receiving terminal, α is the operating quantity of the liquefied natural gas high-pressure pump, β is the operating quantity of the seawater pump, γ is the operating quantity of the boil-off gas compressor, δ is the operating quantity of the liquefied natural gas low-pressure pump, and M is the gasification and external transmission volume.

[0048] Specifically, the preset production load logic relationship is related to the operating quantities and rated powers of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump. For example, the external transmission volume of a full-load operation of a production line in a certain liquefied natural gas receiving terminal is 600×10^4 Nm 3 / d, and the designed maximum external transmission volume is 3600×10^4 Nm 3 / d. The main energy-consuming type of this liquefied natural gas receiving terminal is electricity. Assume that the number of liquefied natural gas high-pressure pumps turned on in the high-pressure transmission system is ɑ, that is, the power consumption of the high-pressure transmission system is 1796ɑ kW. Assume that the number of seawater pumps turned on in the seawater pump system is β, that is, the power consumption of the seawater pump system is 710β kW. Assume that the number of boil-off gas compressors turned on in the boil-off gas treatment system is γ, that is, the power consumption of the boil-off gas treatment system is 870γ kW. Assume that the number of liquefied natural gas low-pressure pumps turned on in the low-pressure liquefied natural gas system is δ, that is, the power consumption of the low-pressure liquefied natural gas system is 210δ kW. Assume that the gasification and external output of the production line is M×104 Nm 3 / d, and the cold insulation cycle is set to 150 m 3 / h (equivalent to 225×104 Nm 3 / d), the boil-off gas generation amount is a variable (equivalent to 14×104 Nm 3 / d + 0.05% of the gasification and external output of the production line), then the optimal operating load z should satisfy the following logical relationship:

[0049] min z = 1796α + 710β + 870γ + 210δ

[0050]

[0051] Among them, z is the total load of the target liquefied natural gas receiving terminal, α is the operating number of liquefied natural gas high-pressure pumps, β is the operating number of seawater pumps, γ is the operating number of boil-off gas compressors, δ is the operating number of liquefied natural gas low-pressure pumps, and M is the gasification and external output.

[0052] It should be noted that different numbers and models of liquefied natural gas high-pressure pumps, seawater pumps, boil-off gas compressors, and liquefied natural gas low-pressure pumps in different liquefied natural gas receiving terminals will cause certain changes in the above formula. For example, if the single power of liquefied natural gas high-pressure pumps, seawater pumps, boil-off gas compressors, and liquefied natural gas low-pressure pumps is different, the formula for the optimal operating load z will also be different.

[0053] Furthermore, according to the preset production load logical relationship, combining the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, step S300 in the method provided by the embodiments of the present application includes:

[0054] Step S310: According to the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, divide the gasification and external output interval to obtain multiple gasification and external output intervals;

[0055] Step S320: According to the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, combine the multiple gasification and external output intervals and the preset production load logical relationship to calculate and obtain multiple total loads;

[0056] Step S330: Obtain the combined function relationship based on the first function relationship, the second function relationship, the third function relationship, the fourth function relationship, multiple gasification and export volume intervals, and multiple total loads, where the combined function relationship includes the functional relationships among the operating quantities of the liquefied natural gas high-pressure pump, the seawater pump, the boil-off gas compressor, and the liquefied natural gas low-pressure pump, the gasification and export volume, and the total load.

[0057] Specifically, based on the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, perform gasification and export volume interval division to obtain multiple gasification and export volume intervals. For example, as shown in Figure 2 , Figure 3 , Figure 5 For the first function relationship, the second function relationship, and the fourth function relationship shown, the functional relationships between the operating quantities of the high-pressure pump, the seawater pump, and the low-pressure pump and the gasification and export volume are distributed in a stepped manner. Different operating quantities of the high-pressure pump, the seawater pump, the low-pressure compressor, and the low-pressure pump correspond to different gasification and export volume intervals. Perform gasification and export volume interval division according to the operating quantities of the high-pressure pump, the seawater pump, the low-pressure compressor, and the low-pressure pump, so as to obtain multiple gasification and export volume intervals. The number of operating devices corresponding to each gasification and export volume interval is different, and the multiple gasification and export volume intervals are in a stepped shape. Further, based on the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, in combination with the multiple gasification and export volume intervals and the preset production load logical relationship, calculate to obtain multiple total loads. The total load refers to the sum of the rated powers of all operating high-pressure pumps, seawater pumps, low-pressure compressors, and low-pressure pumps. Obtain the combined function relationship based on the first function relationship, the second function relationship, the third function relationship, the fourth function relationship, the multiple gasification and export volume intervals, and the multiple total loads, as shown in Figure 6 . Among them, the combined function relationship includes the functional relationships among the operating quantities of the liquefied natural gas high-pressure pump, the seawater pump, the boil-off gas compressor, and the liquefied natural gas low-pressure pump, the gasification and export volume, and the total load of all production lines of the liquefied natural gas receiving station, that is, for each gasification and export volume interval, there corresponds an operating quantity and a total load of the liquefied natural gas high-pressure pump, the seawater pump, the boil-off gas compressor, and the liquefied natural gas low-pressure pump.

[0058] Furthermore, after step S330 in the method provided in the embodiment of the present application, there is step S340, and step S340 includes:

[0059] Step S341: Obtain multiple production line operating quantities based on the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, in combination with the multiple gasification and export volume intervals;

[0060] Step S342: Add the multiple production line operating quantities to the combined function relationship.

[0061] Specifically, a liquefied natural gas receiving station may have multiple production lines. According to the first functional relationship, the second functional relationship, the third functional relationship and the fourth functional relationship, combined with multiple gasification external transmission volume intervals, the operating numbers of multiple production lines are obtained, and the operating numbers of multiple production lines are added to the combined functional relationship. In this way, the combined functional relationship includes the functional relationship between the operating numbers of production lines, the operating numbers of liquefied natural gas high-pressure pumps, seawater pumps, evaporated gas compressors and liquefied natural gas low-pressure pumps, the gasification external transmission volume and the total load, thereby obtaining the optimal combination of liquefied natural gas gasification production lines within different step ranges.

[0062] Furthermore, the real-time gasification output is input into the combined function relationship to obtain a real-time production equipment management plan. Step S500 in the method provided in the embodiment of the present application includes:

[0063] Step S510: obtaining a gasification external output volume interval corresponding to the real-time gasification external output volume as the real-time gasification external output volume interval;

[0064] Step S520: using the real-time gasification external output volume interval to traverse within the combined function relationship, to obtain the real-time production line operation quantity, the real-time liquefied natural gas high-pressure pump operation quantity, the real-time seawater pump operation quantity, the real-time boil-off gas compressor operation quantity, the real-time liquefied natural gas low-pressure pump operation quantity and the real-time total load;

[0065] Step S530: Summarize the real-time production line operation quantity, real-time LNG high-pressure pump operation quantity, real-time seawater pump operation quantity, real-time boil-off gas compressor operation quantity, real-time LNG low-pressure pump operation quantity and real-time total load to obtain the real-time production equipment management plan.

[0066] Specifically, there are multiple gasification external transmission volume intervals in the combined function relationship, each gasification external transmission volume interval corresponds to the number of production line operations, the number of liquefied natural gas high-pressure pump operations, the number of seawater pump operations, the number of boil-off gas compressor operations, the number of liquefied natural gas low-pressure pump operations and the total load, and the gasification external transmission volume interval corresponding to the real-time gasification external transmission volume is obtained as the real-time gasification external transmission volume interval, and the real-time gasification external transmission volume interval is used to traverse the combined function relationship to obtain the real-time production line operation number, real-time liquefied natural gas high-pressure pump operation number, real-time seawater pump operation number, real-time boil-off gas compressor operation number, The real-time number of LNG low-pressure pumps in operation and the real-time total load are summarized by the real-time number of production lines in operation, the real-time number of LNG high-pressure pumps in operation, the real-time number of seawater pumps in operation, the real-time number of evaporated gas compressors in operation, the real-time number of LNG low-pressure pumps in operation and the real-time total load, so as to obtain the real-time production equipment management plan. Furthermore, the target LNG receiving station adopts the real-time production equipment management plan for LNG gasification production, and reduces the unit electricity consumption of external transmission gasification through the combined operation of different numbers of high-pressure pumps, seawater pumps, high-pressure pumps and evaporated gas low-pressure compressors, so as to achieve the overall energy-saving and efficient operation of the LNG receiving station.

[0067] In summary, the optimization combination method of a liquefied natural gas gasification production line provided in this application has the following technical effects:

[0068] The present application proposes a method for optimizing the combination of a liquefied natural gas gasification production line, which makes full use of the excess cold energy of the liquefied natural gas itself to reliquefy the boil-off gas, calculates the required liquefied natural gas flow rate and seawater flow rate by using the gasification amount at different steps, and fits the optimal production line equipment combination method by the method of minimum total power consumption of the production line, thereby realizing the operation mode of the optimized combination of the liquefied natural gas gasification production line, effectively reducing the power consumption of the low-pressure pump, the high-pressure pump, the seawater pump transmission line and the boil-off gas compression unit, and reducing the gasification unit consumption of the liquefied natural gas gasification production line, thereby achieving the technical effect of reducing the number of power-consuming equipment in operation and realizing energy-saving and efficient operation of the liquefied natural gas receiving station.

[0069] Embodiment 2

[0070] Based on the same inventive concept as the method for optimizing the combination of a liquefied natural gas gasification production line in the aforementioned embodiment, Figure 7 As shown, the present application also provides a liquefied natural gas gasification production line optimization combination system, the system comprising:

[0071] The equipment quantity acquisition module 11 is used to acquire the number of LNG high-pressure pumps, the number of seawater pumps, the number of boil-off gas compressors and the number of LNG low-pressure pumps in the target LNG receiving station, and obtain a first number, a second number, a third number and a fourth number;

[0072] A function relationship calculation module 12 is configured to calculate the function relationships between the first quantity, the second quantity, the third quantity, the fourth quantity and the gasification and external transportation volume of the target liquefied natural gas receiving station, and obtain a first function relationship, a second function relationship, a third function relationship and a fourth function relationship;

[0073] A combined function relationship acquisition module 13 is configured to obtain a preset production load logical relationship, and calculate according to the preset production load logical relationship in combination with the first function relationship, the second function relationship, the third function relationship and the fourth function relationship to obtain a combined function relationship;

[0074] A real-time gasification and external transportation volume acquisition module 14 is configured to acquire the current real-time gasification and external transportation volume of the target liquefied natural gas receiving station;

[0075] A production equipment management module 15 inputs the real-time gasification and external transportation volume into the combined function relationship to obtain a real-time production equipment management plan, and the target liquefied natural gas receiving station adopts the real-time production equipment management plan for liquefied natural gas gasification production.

[0076] Furthermore, the function relationship calculation module 12 is further configured to implement the following functions:

[0077] Obtain the rated flow rates of a single liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor and liquefied natural gas low-pressure pump, and obtain a first rated flow rate, a second rated flow rate, a third rated flow rate and a fourth rated flow rate;

[0078] Obtain the rated powers of a single liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor and liquefied natural gas low-pressure pump, and obtain a first rated power, a second rated power, a third rated power and a fourth rated power;

[0079] Calculate the function relationships between the gasification and external transportation volume and the first quantity, the second quantity, the third quantity and the fourth quantity according to the first rated flow rate, the second rated flow rate, the third rated flow rate, the fourth rated flow rate, and the first rated power, the second rated power, the third rated power and the fourth rated power, and obtain the first function relationship, the second function relationship, the third function relationship and the fourth function relationship.

[0080] Furthermore, the obtaining of the preset production load logical relationship is as follows:

[0081] min z=1796α+710β+870γ+210δ

[0082]

[0083] Wherein, z is the total load of the target liquefied natural gas receiving terminal, α is the number of operating liquefied natural gas high-pressure pumps, β is the number of operating seawater pumps, γ is the number of operating boil-off gas compressors, δ is the number of operating liquefied natural gas low-pressure pumps, and M is the gasification and external output volume.

[0084] Furthermore, the combined function relationship acquisition module 13 is further configured to implement the following functions:

[0085] According to the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, divide the gasification and external output volume interval to obtain multiple gasification and external output volume intervals;

[0086] According to the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, combine the multiple gasification and external output volume intervals and the preset production load logical relationship to calculate and obtain multiple total loads;

[0087] According to the first function relationship, the second function relationship, the third function relationship, the fourth function relationship, the multiple gasification and external output volume intervals, and the multiple total loads, obtain the combined function relationship, wherein the combined function relationship includes the function relationships of the operating numbers of the liquefied natural gas high-pressure pump, the seawater pump, the boil-off gas compressor, and the liquefied natural gas low-pressure pump, the gasification and external output volume, and the total load.

[0088] Furthermore, the combined function relationship acquisition module 13 is further configured to implement the following functions:

[0089] According to the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, combine the multiple gasification and external output volume intervals to obtain multiple production line operating numbers;

[0090] Add the multiple production line operating numbers to the combined function relationship.

[0091] Furthermore, the production equipment management module 15 is configured to implement the following functions:

[0092] Obtain the gasification and external output volume interval corresponding to the real-time gasification and external output volume as the real-time gasification and external output volume interval;

[0093] Use the real-time gasification and external output volume interval to traverse within the combined function relationship to obtain the real-time production line operating number, the real-time liquefied natural gas high-pressure pump operating number, the real-time seawater pump operating number, the real-time boil-off gas compressor operating number, the real-time liquefied natural gas low-pressure pump operating number, and the real-time total load;

[0094] Summarize the real-time production line operation quantity, real-time liquefied natural gas high-pressure pump operation quantity, real-time seawater pump operation quantity, real-time boil-off gas compressor operation quantity, real-time liquefied natural gas low-pressure pump operation quantity, and real-time total load to obtain the real-time production equipment management plan.

[0095] Embodiment 3

[0096] Based on the same inventive concept as the method for optimizing the combination of a liquefied natural gas gasification production line in the foregoing embodiment, as Figure 8 shown, the present application further provides an electronic device 300, which includes a memory 301 and a processor 302. A computer program is stored in the memory 301, and when the calculator program is executed by the processor 302, the steps of the method in Embodiment 1 are implemented.

[0097] The electronic device 300 includes: a processor 302, a communication interface 303, and a memory 301. Optionally, the electronic device 300 may further include a bus architecture 304. Among them, the communication interface 303, the processor 302, and the memory 301 may be interconnected through the bus architecture 304; the bus architecture 304 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus architecture 304 may be divided into an address bus, a data bus, a control bus, etc. For the sake of simplicity of representation, Figure 8 only a thick line is used to represent it in the figure, but it does not mean that there is only one bus or one type of bus.

[0098] The processor 302 may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of the program of the present application solution.

[0099] The communication interface 303 uses any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), wired access networks, etc.

[0100] The memory 301 can be a ROM or other types of static storage devices that can store static information and instructions, a RAM or other types of dynamic storage devices that can store information and instructions, or can also be an electrically erasable programmable read only memory (EEPROM), a compact disc read only memory (CD ROM), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory can exist independently and be connected to the processor through the bus architecture 304. The memory can also be integrated with the processor.

[0101] Among them, the memory 301 is used to store the computer execution instructions for executing the solution of this application, and is controlled by the processor 302 for execution. The processor 302 is used to execute the computer execution instructions stored in the memory 301, so as to implement the steps of the method in the first embodiment of this application.

[0102] Embodiment 4

[0103] Based on the same inventive concept as the method for optimizing the combination of a liquefied natural gas gasification production line in the foregoing embodiments, this application also provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the steps of the method in Embodiment 1 are implemented.

[0104] In this specification, each embodiment is described in a progressive manner, and the key point of each embodiment is to illustrate the differences from other embodiments. The foregoing Figure 1 The method for optimizing the combination of a liquefied natural gas gasification production line and specific examples in Embodiment 1 are equally applicable to the system for optimizing the combination of a liquefied natural gas gasification production line in this embodiment. Through the foregoing detailed description of the method for optimizing the combination of a liquefied natural gas gasification production line, those skilled in the art can clearly know the system for optimizing the combination of a liquefied natural gas gasification production line in this embodiment. Therefore, for the sake of brevity of the specification, it will not be described in detail here. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0105] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An optimization combination method for a liquefied natural gas gasification production line, characterized in that The method includes: Obtaining the quantities of liquefied natural gas high-pressure pumps, seawater pumps, boil-off gas compressors, and liquefied natural gas low-pressure pumps in the target liquefied natural gas receiving terminal, and obtaining a first quantity, a second quantity, a third quantity, and a fourth quantity; Calculating the functional relationships between the first quantity, the second quantity, the third quantity, and the fourth quantity and the gasification and external transportation volume of the target liquefied natural gas receiving terminal, and obtaining a first functional relationship, a second functional relationship, a third functional relationship, and a fourth functional relationship; Obtaining a preset production load logical relationship, and calculating in accordance with the preset production load logical relationship, combining the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship, to obtain a combined functional relationship; Obtaining the current real-time gasification and external transportation volume of the target liquefied natural gas receiving terminal; Inputting the real-time gasification and external transportation volume into the combined functional relationship to obtain a real-time production equipment management plan, and the target liquefied natural gas receiving terminal adopts the real-time production equipment management plan for liquefied natural gas gasification production.

2. The method according to claim 1, wherein Calculating the functional relationships between the first quantity, the second quantity, the third quantity, and the fourth quantity and the gasification and external transportation volume of the target liquefied natural gas receiving terminal includes: Obtaining the rated flow rates of a single liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump, and obtaining a first rated flow rate, a second rated flow rate, a third rated flow rate, and a fourth rated flow rate; Obtaining the rated powers of a single liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump, and obtaining a first rated power, a second rated power, a third rated power, and a fourth rated power; According to the first rated flow rate, the second rated flow rate, the third rated flow rate, the fourth rated flow rate, as well as the first rated power, the second rated power, the third rated power, and the fourth rated power, calculating the functional relationships between the gasification and external transportation volume and the first quantity, the second quantity, the third quantity, and the fourth quantity, and obtaining the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship.

3. The method according to claim 1, wherein The obtaining of the preset production load logical relationship is as follows: min z = 1796α + 710β + 870γ + 210δ where z is the total load of the target liquefied natural gas receiving terminal, α is the number of operating liquefied natural gas high-pressure pumps, β is the number of operating seawater pumps, γ is the number of operating boil-off gas compressors, δ is the number of operating liquefied natural gas low-pressure pumps, and M is the gasification and external transportation volume.

4. The method according to claim 3, wherein Calculating in accordance with the preset production load logical relationship, combining the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship includes: According to the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship, performing gasification and external transportation volume interval division to obtain multiple gasification and external transportation volume intervals; According to the first functional relationship, the second functional relationship, the third functional relationship, and the fourth functional relationship, combining the multiple gasification and external transportation volume intervals and the preset production load logical relationship, and calculating to obtain multiple total loads; Obtain the combined function relationship according to the first function relationship, the second function relationship, the third function relationship, the fourth function relationship, multiple gasification output quantity intervals, and multiple total loads, where the combined function relationship includes the functional relationships of the operating quantities of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump, the gasification output quantity, and the total load.

5. The method according to claim 4, characterized in that, The method further includes: Obtain the operating quantities of multiple production lines according to the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship, in combination with the multiple gasification output quantity intervals. Add the operating quantities of the multiple production lines to the combined function relationship.

6. The method according to claim 5, characterized in that Input the real-time gasification output quantity into the combined function relationship to obtain a real-time production equipment management plan, including: Obtain the gasification output quantity interval corresponding to the real-time gasification output quantity as the real-time gasification output quantity interval. Traverse within the combined function relationship using the real-time gasification output quantity interval to obtain the real-time operating quantity of the production line, the real-time operating quantity of the liquefied natural gas high-pressure pump, the real-time operating quantity of the seawater pump, the real-time operating quantity of the boil-off gas compressor, the real-time operating quantity of the liquefied natural gas low-pressure pump, and the real-time total load. Summarize the real-time operating quantity of the production line, the real-time operating quantity of the liquefied natural gas high-pressure pump, the real-time operating quantity of the seawater pump, the real-time operating quantity of the boil-off gas compressor, the real-time operating quantity of the liquefied natural gas low-pressure pump, and the real-time total load to obtain the real-time production equipment management plan.

7. An optimized combined system for a liquefied natural gas gasification production line, characterized in that, The system includes: An equipment quantity acquisition module, configured to acquire the quantities of the liquefied natural gas high-pressure pump, seawater pump, boil-off gas compressor, and liquefied natural gas low-pressure pump in a target liquefied natural gas receiving station to obtain a first quantity, a second quantity, a third quantity, and a fourth quantity. A function relationship calculation module, configured to calculate the functional relationships between the first quantity, the second quantity, the third quantity, and the fourth quantity and the gasification output quantity of the target liquefied natural gas receiving station to obtain a first function relationship, a second function relationship, a third function relationship, and a fourth function relationship. A combined function relationship acquisition module, configured to acquire a preset production load logic relationship, and calculate in combination with the first function relationship, the second function relationship, the third function relationship, and the fourth function relationship according to the preset production load logic relationship to obtain a combined function relationship. A real-time gasification output quantity acquisition module, configured to acquire the current real-time gasification output quantity of the target liquefied natural gas receiving station. A production equipment management module, configured to input the real-time gasification output quantity into the combined function relationship to obtain a real-time production equipment management plan, and the target liquefied natural gas receiving station uses the real-time production equipment management plan for liquefied natural gas gasification production.

8. An electronic device, characterized in that, The electronic device includes a memory and a processor, and a computer program is stored in the memory. When the computer program is executed by the processor, the steps of the method according to any one of claims 1-6 are implemented.

9. A computer-readable storage medium, characterized in that, A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the method according to any one of claims 1-6 are implemented.

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