Automatic stowage method for chemical tanker based on route planning

Abstract

The invention discloses a chemical tanker automatic stowage method based on route planning, and belongs to the technical field of chemical tanker stowage, and the method comprises the steps: obtaining chemical property data and carrying condition data, and constructing a chemical information database; encoding ports in a planning period to generate an initial route population; according to database data and ship cargo hold performance, an optimal stowage scheme meeting stability and safety requirements is generated; formulating a transportation scheme evaluation standard and model, retaining first 40% of high-quality routes according to an evaluation result, and updating a route population; and judging whether a termination condition is met or not, if so, outputting an optimal transportation scheme, and if not, continuing iterative operation. According to the chemical tanker automatic stowage method based on route planning, the optimization problem of chemical tanker route planning and automatic stowage can be solved, the safety of dangerous chemical transportation is improved, the marine ecological environment is maintained, the shipping time is saved, the transport capacity tension is relieved, and the economic benefits are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical ship stowage, and in particular to an automatic stowage method for chemical ships based on route planning. Background Art

[0002] In recent years, the production and consumption of domestic chemical products have grown annually, driving the continued expansion of the chemical tanker shipping market. Chemical tankers carry a wide variety of cargoes, including toxic, flammable, volatile, and corrosive chemical liquids. These cargoes are chemically unstable and have varying requirements for suitable loading conditions, including temperature, pressure, cargo hold materials, and compatibility. With the rapid growth in shipping volume and the increasing demand for specialized chemical loading, there is an urgent need for specialized route planning and stowage solutions and systems to meet these demands.

[0003] Traditional chemical tanker route planning and stowage plans are typically developed by the chief officer based on experience. These plans include selecting the ordered cargo for service, determining the sequence of ports visited for loading and unloading, and the cargo holds in which the cargo will be stored. This type of plan requires comprehensive consideration of information related to the vessel, cargo, ports, and route to plan the transportation plan. However, manual planning is not only time-consuming and labor-intensive, but also often results in suboptimal or even unfeasible plans due to manual oversight. Stowage is a critical step in the chemical tanker transportation process, and the quality of the stowage plan directly impacts the safety and economic efficiency of chemical maritime transport. A reasonable stowage plan associated with route planning can improve transportation safety, protect the marine ecological environment, save shipping time, alleviate capacity constraints, and improve economic efficiency. Currently, research on stowage plans for chemical tanker cargo hold allocation and route planning is limited. There is a need to design a rational automated stowage method for the entire transportation process, tailored to the stowage plans for various chemical specifications and route planning between ports. Summary of the Invention

[0004] The purpose of the present invention is to provide a chemical tanker automatic loading method based on route planning, which can solve the optimization problem of chemical tanker route planning and automatic loading, improve the safety of dangerous chemical transportation, maintain the marine ecological environment, save shipping time, alleviate capacity shortage and improve economic benefits.

[0005] To achieve the above object, the present invention provides a method for automatic loading of chemical tankers based on route planning, comprising the following steps:

[0006] S1. Obtain the data on the properties and transportation conditions of the chemicals to be loaded, and build an information database of the chemicals to be loaded; obtain the information of all ports in the entire planning period and perform real-value coding on the ports in the planning period, and generate several individual routes as the initialization population;

[0007] S2. Generate an optimal loading plan that meets the chemical tanker's stability and chemical safety requirements based on the data in the chemical information database and the cargo tank performance data on the chemical tanker;

[0008] S3. Develop shipping scheme evaluation criteria and models. Based on the evaluation results of the current shipping schemes, retain the top 40% of routes with small scheme planning coefficients as the existing route population, and multiply and update the route population to obtain new feasible routes;

[0009] S4. Determine whether the termination condition is met. If so, terminate the operation and output the current route and loading plan combination as the optimal shipping plan. If not, return to S2 to continue the iterative operation.

[0010] Preferably, said S1 comprises the following steps:

[0011] S1.1. Based on the genetic algorithm, real-value encoding is performed on each port that the chemical tanker passes through during the entire planning period. Using the port loading period as a constraint, several individuals that meet the constraints are randomly generated as the initial routes, which constitute the initial population in the genetic algorithm.

[0012] The loading period refers to the period during which the vessel arrives at the agreed loading port within the specified date and is ready for loading; the number of individuals in the initial population consisting of several initial route individuals shall not exceed 15 times the number of ports within the planning period;

[0013] S1.2. Input the properties and transportation conditions of the chemicals to be loaded and build an information database of the chemicals to be loaded;

[0014] Among them, the data on the properties of chemicals to be loaded include the compatibility between chemicals and the characteristics of hazardous chemicals; the data on the transportation conditions of chemicals to be loaded include the temperature, pressure, and cargo hold materials required for transportation; the characteristics of hazardous chemicals include flammability, explosiveness, toxicity, corrosiveness, and harm to the environment; the data on the properties of chemicals to be loaded and the transportation conditions data can be obtained by the cargo consignor.

[0015] Preferably, said S2 comprises the following steps:

[0016] S2.1. Obtain the performance data of each cargo tank on the chemical carrier and generate a set of cargo tanks that can be loaded for each chemical using the data of the chemicals to be loaded in the information database of the chemicals to be loaded;

[0017] S2.2. Generate a loading plan that matches the current route and meets the principles of ship stability and chemical safety.

[0018] Preferably, said S3 comprises the following steps:

[0019] S3.1. Develop shipping plan evaluation criteria and a plan planning coefficient evaluation model. Calculate the plan planning coefficient χ for the current overall shipping plan, including the route plan and loading plan. Compare this coefficient with the existing plan planning coefficients. Retain the top 40% of routes with the smallest plan planning coefficients as the existing route population. Initially, the plan planning coefficient χ is set to 1.

[0020] The evaluation criteria include the total time consumed by the shipping scheme, the time that high-risk chemicals are on board, and the overall transportation process cost; the total time consumed by the shipping scheme refers to the total time it takes for the chemical ship to complete the transportation of chemicals during the entire planning period; the high-risk chemicals include flammable and explosive chemicals, highly corrosive chemicals, chemicals that are highly polluting to the ecological environment, and toxic and harmful chemicals if leaked; the time that high-risk chemicals are on board refers to the time that the above-mentioned high-risk chemicals are in transit; the overall transportation process cost includes total fuel cost, total charter fee, and total port fee; the evaluation model of the scheme planning coefficient χ is shown in formula (1):

[0021]

[0022] Among them, t z The total time consumed by the current shipping plan refers to the total time it takes for the chemical tanker to complete the chemical transportation during the entire planning period, in days; t w is the total time that high-risk chemicals are in transit in the current shipping plan, unit: day; t m1 The maximum time it takes for a chemical tanker to complete chemical transportation during the entire planning period in all shipping options, in days; t m2 is the maximum time that high-risk chemicals are on board in all shipping options, unit: day; c is the total transportation cost in the current shipping option, unit: 10,000 yuan; c m The highest transportation cost among all shipping options, unit: 10,000 yuan;

[0023] S3.2. Adaptively cross the codes in the adjacently ordered coding sequences of the route individuals in the existing route population to reproduce new offspring feasible route individuals to form an updated existing population.

[0024] Preferably, the termination condition in S4 is that the algorithm terminates when the relative difference between the individual planning coefficients of two adjacent generations of routes is less than 0.5%; or to avoid infinite iterations resulting in excessive calculation time, the number of iterations is preset to 100 to 500 times.

[0025] Preferably, the S2.1 includes the following steps:

[0026] S2.1.1. Obtain the cargo capacity data of each cargo tank on the chemical tanker; the cargo tank capacity data includes the maximum storage volume, cargo tank material, cargo tank temperature, and cargo tank pressure;

[0027] S2.1.2. Based on the data of chemicals to be loaded in the information database of chemicals to be loaded, match the available cargo holds on the chemical tanker for each chemical to be loaded; the available cargo holds should meet the temperature, pressure, and cargo hold material requirements for transporting the chemical;

[0028] S2.1.3. Based on the total transport volume of each chemical to be loaded and the maximum storage volume of the matching cargo hold, obtain the set of loadable compartments for each chemical.

[0029] Preferably, the S2.2 includes the following steps:

[0030] S2.2.1. Set the initial planning coefficient χ of each individual route to 1;

[0031] The program planning coefficient χ is a comprehensive evaluation standard used to evaluate the economy, safety and timeliness of each route planning and loading plan;

[0032] S2.2.2. Select the first chemical to be loaded according to the current route planning sequence;

[0033] The order of selecting the first chemical to be loaded shall be based on the current individual route planning order, and the chemical to be loaded at the first loading cargo port shall be selected as the first chemical to be loaded; if the first loading cargo port contains multiple chemicals to be loaded, they shall be selected and sorted in order of having hazardous chemical characteristics, requirements for cargo hold materials, requirements for cargo hold temperature, and large carrying capacity; if multiple chemicals to be loaded meet the above conditions, the first chemical to be loaded shall be randomly selected;

[0034] S2.2.3. Based on the current loading status of the chemical tanker, the remaining unloaded cargo holds of the ship shall be ranked according to the degree to which the next loading in this cargo hold will benefit the stability of the ship, specifically, the next loading in this cargo hold will result in the highest initial stability value of the ship; and the first cargo hold to be loaded shall be selected in the order;

[0035] S2.2.4. Determine whether the cargo hold can be fully loaded with the chemicals to be loaded. If so, proceed with loading and generate a complete loading plan for the chemicals to be loaded. If not, determine whether the cargo hold is the last one. If so, set the individual plan planning coefficient χ for the route to 1 and execute S3. If not, execute S2.2.5.

[0036] S2.2.5. Determine whether the chemicals to be loaded can be partially loaded in the cargo hold. If so, generate a partial loading plan for the chemicals to be loaded, and the remaining chemicals will be loaded into the next cargo hold in order and execute S2.2.4. If not, directly load the chemicals into the next cargo hold and execute S2.2.4.

[0037] S2.2.6. After generating a complete loading plan for the chemical to be loaded, determine whether the chemical to be loaded is the last chemical to be loaded on the current route. If so, proceed to S2.2.7. If not, select the next chemical to be loaded according to the route plan and proceed to S2.2.3.

[0038] S2.2.7. Determine whether all chemicals to be loaded on the individual route are fully loaded. If so, output the shipping plan and execute S3.1. Otherwise, set the plan planning coefficient of the individual route to 1 and execute S3.

[0039] Therefore, the present invention adopts the above-mentioned automatic loading method for chemical ships based on route planning, which can solve the optimization problem of route planning and automatic loading for chemical ships, improve the safety of dangerous chemical transportation, maintain the marine ecological environment, save shipping time, alleviate capacity shortage and improve economic benefits.

[0040] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a general flow chart of an embodiment of a method for automatic loading of a chemical tanker based on route planning according to the present invention;

[0042] Figure 2 This is a process diagram of an embodiment of a method for automatic loading of a chemical tanker based on route planning according to the present invention;

[0043] Figure 3 This is a flow chart of generating a loading plan according to an embodiment of a method for automatic loading of a chemical tanker based on route planning according to the present invention;

[0044] Figure 4 The present invention is a schematic diagram of a cargo hold structure for generating a loading plan according to an embodiment of a method for automatic loading of a chemical tanker based on route planning. DETAILED DESCRIPTION

[0045] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0046] Unless otherwise defined, technical or scientific terms used in the present invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0047] Example 1

[0048] like Figure 1 As shown, the present invention provides a method for automatic loading of chemical tankers based on route planning, comprising the following steps:

[0049] S1. Obtain the data on the properties and transportation conditions of the chemicals to be loaded, and build a database of the chemicals to be loaded; obtain the information on all ports within the entire planning period and perform real-value coding on the ports within the planning period, and generate several individual routes as the initial population. Figure 2 As shown, the following steps are included:

[0050] S1.1. Based on the genetic algorithm, real-value encoding is performed on each port that the chemical tanker passes through during the entire planning period. The loading period of the port is used as a constraint condition, and several individuals that meet the constraint conditions are randomly generated as the initial routes, which constitute the initialization population in the genetic algorithm.

[0051] The loading period is the time it takes for a vessel to arrive at the agreed loading port and be ready for loading. The number of individuals in the initial population consisting of several initial route individuals should not exceed 15 times the number of ports in the planning period.

[0052] S1.2. Input the property data and transportation condition data of the chemicals to be loaded and build an information database of the chemicals to be loaded.

[0053] In the present invention, the property data of the chemicals to be loaded includes the compatibility between chemicals and the characteristics of hazardous chemicals. The transportation condition data of the chemicals to be loaded includes the temperature, pressure, and cargo hold material required for transportation. The characteristics of hazardous chemicals include flammability, explosiveness, toxicity, corrosiveness, and environmental damage.

[0054] In the present invention, the property data of the chemicals to be loaded and the transportation condition data can be obtained by the cargo consignor.

[0055] S2. Based on the data in the chemical information database to be loaded and the cargo tank performance data on the chemical carrier, generate the best loading plan that meets the chemical tanker's ship stability and chemical safety principles. Figure 2 As shown, the following steps are included:

[0056] S2.1. Obtain the performance data of each cargo tank on the chemical ship, and use the data of the chemicals to be loaded in the information database of the chemicals to be loaded to generate a set of tanks that can be loaded for each chemical. Figure 2 As shown, the following steps are included:

[0057] S2.1.1. Obtain the carrying capacity data of each cargo tank on the chemical tanker.

[0058] The cargo hold's carrying performance data includes the maximum storage volume of the cargo hold, cargo hold material, cargo hold temperature, and cargo hold pressure.

[0059] S2.1.2. Based on the data of chemicals to be loaded in the information database of chemicals to be loaded, match the cargo holds available for loading each chemical to be loaded on the chemical tanker.

[0060] The cargo holds available for loading should meet the temperature, pressure, cargo hold material and other conditions required for transporting the chemical.

[0061] S2.1.3. Based on the total transport quantity of each chemical to be loaded and the maximum storage volume of the matching cargo hold, obtain the set of loadable compartments for each chemical.

[0062] S2.2. Generate a loading plan that matches the current route and meets the ship stability and chemical safety principles. Figure 3 As shown, the following steps are included:

[0063] S2.2.1. Set the initial planning coefficient χ of each individual route to 1.

[0064] The scheme planning coefficient is a comprehensive evaluation standard used to assess the economy, safety and timeliness of each route planning and loading plan.

[0065] S2.2.2. Select the first chemical to be loaded according to the current route planning sequence.

[0066] The order of selection of the first chemicals to be loaded should be based on the current individual route planning order, and the chemicals to be loaded in the first loading cargo port should be selected as the first chemicals to be loaded; if the first loading cargo port contains multiple chemicals to be loaded, they should be selected and sorted in order of having the characteristics of hazardous chemicals, having special requirements for cargo hold materials, having special requirements for cargo hold temperature, and having a large carrying capacity. If the above conditions are consistent for multiple chemicals to be loaded, the first chemical to be loaded will be randomly selected.

[0067] S2.2.3. Based on the current loading status of the chemical tanker, the remaining unloaded cargo holds of the ship shall be ranked according to the degree to which the next loading in this cargo hold will benefit the stability of the ship. Specifically, the ranking shall be based on the maximum initial stability (GM value) of the ship that will be increased by the next loading in this cargo hold within a reasonable range. The first cargo hold to be loaded shall be selected in the order.

[0068] S2.2.4. Determine whether the chemicals to be loaded can be completely loaded in the cargo hold. If so, proceed with loading and generate a complete loading plan for the chemicals to be loaded. If not, determine whether the cargo hold is the last one. If so, set the individual plan planning coefficient χ for the route to 1 and execute S3. If not, execute S2.2.5.

[0069] S2.2.5. Determine whether the chemicals to be loaded can be partially loaded in the cargo hold. If so, generate a partial loading plan for the chemicals to be loaded, and proceed to the next module in sequence to execute S2.2.4 for the remaining chemicals. If not, proceed directly to the next module to execute S2.2.4.

[0070] S2.2.6. After generating a complete loading plan for the current chemical to be loaded, determine whether the chemical to be loaded is the last chemical to be loaded on the current route. If so, execute S2.2.7; if not, select the next chemical to be loaded according to the route plan and execute S2.2.4.

[0071] S2.2.7. Determine whether all chemicals to be loaded on the route are fully loaded. If so, output the shipping plan and execute S3. Otherwise, set the individual plan planning coefficient to 1 and execute S3.

[0072] S3. Develop shipping scheme evaluation standards and models. Based on the evaluation results of the current shipping scheme, retain the top 40% of routes with the smallest scheme planning coefficients as the existing route population, and multiply and update the route population to obtain new feasible routes. Figure 2 As shown, the following steps are included:

[0073] S3.1. Develop shipping plan evaluation criteria and a plan planning coefficient evaluation model. Calculate the plan planning coefficient χ for the current overall shipping plan, including the route plan and stowage plan. Compare this coefficient with the existing plan planning coefficients. Retain the top 40% of individual routes with the smallest plan planning coefficients as the existing route population. Initially, set the plan planning coefficient χ to 1.

[0074] The evaluation criteria include the total time consumed by the shipping plan, the time high-risk chemicals are on board, and the overall transportation process cost. The total time consumed by the shipping plan refers to the total time it takes for the chemical ship to complete the chemical transportation during the entire planning period; high-risk chemicals include flammable and explosive chemicals, highly corrosive chemicals, chemicals that cause significant ecological pollution if leaked, and toxic and harmful chemicals. The time high-risk chemicals are on board refers to the time these high-risk chemicals are in transit; the overall transportation process cost includes total fuel costs, total charter fees, and total port fees. The evaluation model for the plan planning coefficient χ is shown in Equation (1):

[0075]

[0076] Among them, t z The total time consumed by the current shipping plan refers to the total time it takes for the chemical tanker to complete the chemical transportation during the entire planning period, in days; t w is the total time that high-risk chemicals are in transit in the current shipping plan, unit: day; t m1 The maximum time it takes for a chemical tanker to complete chemical transportation during the entire planning period in all shipping options, in days; t m2 is the maximum time that high-risk chemicals are on board in all shipping options, unit: day; c is the total transportation cost in the current shipping option, unit: 10,000 yuan; c m The highest transportation cost among all shipping options, unit: 10,000 yuan.

[0077] S3.2. Adaptively cross the codes in the adjacently ordered coding sequences of the route individuals in the existing route population to reproduce new offspring feasible route individuals to form an updated existing population.

[0078] S4. Determine whether the termination condition is met. If so, terminate the operation and output the current route and loading plan combination as the optimal shipping plan. If not, return to S2 to continue the iterative operation.

[0079] The termination condition means that the algorithm terminates when the relative difference between the planning coefficients of the individual schemes of two adjacent generations of routes is less than 0.5%; or in order to avoid infinite iterations that lead to excessive calculation time, the number of iterations is generally preset to 100 to 500 times.

[0080] As shown in the following experimental results, a certain type of chemical tanker was selected to carry 5 different chemicals. The specific information of the chemical tanker and the carried chemicals and the automatic loading results are as follows:

[0081] Table 1 Chemical tanker models

[0082]

[0083] Table 2 Information on transported chemical cargoes

[0084]

[0085]

[0086] The optimal shipping solution is obtained:

[0087] Departure Port: Port A

[0088] Port A: Load cargo 1 (500 tons) into hold 1, and cargo 3 (300 tons) into hold 3;

[0089] Port A-Port B: Estimated sailing time: 2 days;

[0090] Port B: Load cargo 2 (400 tons) into cargo hold 2, and cargo 5 (100 tons) into cargo hold 5;

[0091] Port B-Port C: Estimated sailing time: 1 day;

[0092] Port C: Load cargo 4 (200 tons) into cargo hold 4;

[0093] Port C-Port D: Estimated sailing time: 3 days;

[0094] Port D: unloaded cargo 1 (500 tons);

[0095] Port D-Port E: Estimated sailing time: 2 days;

[0096] Port E: unloaded cargo 2 (400 tons);

[0097] Port E-Port F: Estimated sailing time: 1 day;

[0098] Port F: unloaded cargo 3 (300 tons);

[0099] Port F-Port G: Estimated sailing time: 2 days;

[0100] Port G: unloaded cargo 4 (200 tons);

[0101] Port G-Port H: Estimated sailing time: 1 day;

[0102] Port H: Unloaded cargo 5 (100 tons).

[0103] Among them, cargo holds 6-8 are set as spare cargo holds for possible additional cargo or emergency situations.

[0104] The system's automatic stowage system screened out the n generated shipping options and selected the one with the lowest planning coefficient. The optimal shipping option's planning coefficient was 0.457 (rounded to three decimal places), representing the optimal shipping option based on a comprehensive selection of factors: short sailing time, short transit time for high-risk chemicals, and low shipping costs.

[0105] Therefore, the present invention adopts the above-mentioned automatic loading method for chemical ships based on route planning, which can solve the optimization problem of route planning and automatic loading for chemical ships, improve the safety of dangerous chemical transportation, maintain the marine ecological environment, save shipping time, alleviate capacity shortage and improve economic benefits.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for automatic loading of chemical tankers based on route planning, characterized by: The following steps are involved: S1. Obtaining data on the properties of chemicals to be loaded and data on transportation conditions, and building an information database on chemicals to be loaded; Obtain all port information during the entire planning period and perform real-value encoding on the ports during the planning period, generating several individual routes as the initial population; S2. Generate an optimal loading plan that meets the chemical tanker's stability and chemical safety requirements based on the data in the chemical information database and the cargo tank performance data on the chemical carrier; S3. Develop shipping scheme evaluation criteria and models. Based on the evaluation results of the current shipping schemes, retain the top 40% of routes with small scheme planning coefficients as the existing route population, and multiply and update the route population to obtain new feasible routes; S4. Determine whether the termination condition is met. If so, terminate the operation and output the current route and loading plan combination as the optimal shipping plan. If not, return to S2 to continue the iterative operation.

2. The automatic loading method for chemical tankers based on route planning according to claim 1, characterized in that: Said S1 comprises the following steps: S1.

1. Based on the genetic algorithm, real-value encoding is performed on each port that the chemical tanker passes through during the entire planning period. Using the port loading period as a constraint, several individuals that meet the constraints are randomly generated as the initial routes, which constitute the initial population in the genetic algorithm. The loading period refers to the period during which the vessel arrives at the agreed loading port within the specified date and is ready for loading; the number of individuals in the initial population consisting of several initial route individuals shall not exceed 15 times the number of ports within the planning period; S1.

2. Input the properties and transportation conditions of the chemicals to be loaded and build an information database of the chemicals to be loaded; Among them, the data on the properties of chemicals to be loaded include the compatibility between chemicals and the characteristics of hazardous chemicals; the data on the transportation conditions of chemicals to be loaded include the temperature, pressure, and cargo hold materials required for transportation; the characteristics of hazardous chemicals include flammability, explosiveness, toxicity, corrosiveness, and harm to the environment; the data on the properties of chemicals to be loaded and the transportation conditions data can be obtained by the cargo consignor.

3. The automatic loading method for chemical tankers based on route planning according to claim 1, characterized in that: The S2 comprises the following steps: S2.

1. Obtain the performance data of each cargo tank on the chemical carrier and generate a set of cargo tanks that can be loaded for each chemical using the data of the chemicals to be loaded in the information database of the chemicals to be loaded; S2.

2. Generate a loading plan that matches the current route and meets the principles of ship stability and chemical safety.

4. The automatic loading method for chemical tankers based on route planning according to claim 1 is characterized in that: The S3 includes the following steps: S3.

1. Develop shipping plan evaluation criteria and a plan planning coefficient evaluation model. Calculate the plan planning coefficient χ for the current overall shipping plan, including the route plan and loading plan. Compare this coefficient with the existing plan planning coefficients. Retain the top 40% of routes with the smallest plan planning coefficients as the existing route population. Initially, the plan planning coefficient χ is set to 1. The evaluation criteria include the total time consumed by the shipping scheme, the time that high-risk chemicals are on board, and the overall transportation process cost; the total time consumed by the shipping scheme refers to the total time it takes for the chemical ship to complete the transportation of chemicals during the entire planning period; the high-risk chemicals include flammable and explosive chemicals, highly corrosive chemicals, chemicals that are highly polluting to the ecological environment, and toxic and harmful chemicals if leaked; the time that high-risk chemicals are on board refers to the time that the above-mentioned high-risk chemicals are in transit; the overall transportation process cost includes total fuel cost, total charter fee, and total port fee; the evaluation model of the scheme planning coefficient χ is shown in formula (1): Among them, t z The total time consumed by the current shipping plan refers to the total time it takes for the chemical tanker to complete the chemical transportation during the entire planning period, in days; t w is the total time that high-risk chemicals are in transit in the current shipping plan, unit: day; t m1 The maximum time it takes for a chemical tanker to complete chemical transportation during the entire planning period in all shipping options, in days; t m2 is the maximum time that high-risk chemicals are on board in all shipping options, unit: day; c is the total transportation cost in the current shipping option, unit: 10,000 yuan; c m The highest transportation cost among all shipping options, unit: 10,000 yuan; S3.

2. Adaptively cross the codes in the adjacently ordered coding sequences of the route individuals in the existing route population to reproduce new offspring feasible route individuals to form an updated existing population.

5. The automatic loading method for chemical tankers based on route planning according to claim 1 is characterized in that: The termination condition in S4 is that the algorithm terminates when the relative difference between the planning coefficients of the individual schemes of two adjacent generations of routes is less than 0.5%; or to avoid the situation where infinite iterations lead to excessive calculation time, the number of iterations is preset to 100 to 500 times.

6. The automatic loading method for chemical tankers based on route planning according to claim 3, characterized in that: The S2.1 includes the following steps: S2.1.

1. Obtain the cargo capacity data of each cargo tank on the chemical tanker; the cargo tank capacity data includes the maximum storage volume, cargo tank material, cargo tank temperature, and cargo tank pressure; S2.1.

2. Based on the data of chemicals to be loaded in the information database of chemicals to be loaded, match the available cargo holds on the chemical tanker for each chemical to be loaded; the available cargo holds should meet the temperature, pressure, and cargo hold material requirements for transporting the chemical; S2.1.

3. Based on the total transport volume of each chemical to be loaded and the maximum storage volume of the matching cargo hold, obtain the set of loadable compartments for each chemical.

7. The automatic loading method for chemical tankers based on route planning according to claim 3 is characterized in that: The S2.2 includes the following steps: S2.2.

1. Set the initial planning coefficient χ of each individual route to 1; The program planning coefficient χ is a comprehensive evaluation standard used to evaluate the economy, safety and timeliness of each route planning and loading plan; S2.2.

2. Select the first chemical to be loaded according to the current route planning sequence; The order of selecting the first chemical to be loaded shall be based on the current individual route planning order, and the chemical to be loaded at the first loading cargo port shall be selected as the first chemical to be loaded; if the first loading cargo port contains multiple chemicals to be loaded, they shall be selected and sorted in order of having hazardous chemical characteristics, requirements for cargo hold materials, requirements for cargo hold temperature, and large carrying capacity; if multiple chemicals to be loaded meet the above conditions, the first chemical to be loaded shall be randomly selected; S2.2.

3. Based on the current loading status of the chemical tanker, the remaining unloaded cargo holds of the ship shall be ranked according to the degree to which the next loading in this cargo hold will benefit the stability of the ship, specifically, the next loading in this cargo hold will result in the highest initial stability value of the ship; and the first cargo hold to be loaded shall be selected in the order; S2.2.

4. Determine whether the cargo hold can be fully loaded with the chemicals to be loaded. If so, proceed with loading and generate a complete loading plan for the chemicals to be loaded. If not, determine whether the cargo hold is the last one. If so, set the individual plan planning coefficient χ for the route to 1 and execute S3. If not, execute S2.2.

5. S2.2.

5. Determine whether the chemicals to be loaded can be partially loaded in the cargo hold. If so, generate a partial loading plan for the chemicals to be loaded, and the remaining chemicals will be loaded into the next cargo hold in order and execute S2.2.

4. If not, directly load the chemicals into the next cargo hold and execute S2.2.

4. S2.2.

6. After generating a complete loading plan for the chemical to be loaded, determine whether the chemical to be loaded is the last chemical to be loaded on the current route. If so, proceed to S2.2.

7. If not, select the next chemical to be loaded according to the route plan and proceed to S2.2.

3. S2.2.

7. Determine whether all chemicals to be loaded on the individual route are fully loaded. If so, output the shipping plan and execute S3.

1. Otherwise, set the plan planning coefficient of the individual route to 1 and execute S3.

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