A chemical tanker automatic loading and unloading joint adjustment system

Abstract

A chemical tanker automatic loading and unloading joint adjustment system and its use method, the system includes multiple cargo holds, multiple ballast tanks, multiple cargo pumps and ballast pumps; the cargo hold is provided with a tank inlet valve, a cargo hold outlet valve, a cargo pump and a vent valve, the ballast tank is provided with a ballast tank inlet and outlet valve; the cargo pump is provided with a cargo pump outlet valve, the ballast pump is provided with a ballast pump discharge valve, and the ballast pump discharge valve is connected to multiple ballast tanks through a discharge pipeline; the use method includes loading joint adjustment operation and unloading joint adjustment operation; in the loading and unloading joint adjustment operation, the input flow of the cargo hold is allocated by mathematical calculation, the liquid level height in the cargo hold changes correspondingly with the flow, the pressure balance in the cargo hold is maintained, and at the same time, the ballast tank performs ballasting and water discharge operations to keep the ship stable, thereby completing the loading and unloading joint adjustment operation. Therefore, this design not only has a high degree of coordination between the ship and machine systems, but also has a high loading and unloading efficiency.

Description

Technical Field

[0001] The invention relates to a cargo loading and unloading system, and belongs to the field of liquid cargo loading and unloading systems for chemical tankers, and in particular to an automatic cargo loading and unloading joint adjustment system for chemical tankers. Background Art

[0002] The liquid cargo system is the core operating system of chemical tankers. The system generally includes cargo pump system, ballast system, valve remote control system, liquid level telemetry system, inert gas system, cargo hold heating system, ballast water treatment system, ODME system, ship-shore ESDS system, tank washing pump, tank washing machine, tank washing water heating equipment and cargo hold ventilation equipment, etc., to realize liquid cargo operations and cargo management functions such as cargo loading and unloading, tank washing, pressure discharge, cargo heating, cargo hold ventilation, etc.; Automatic loading and unloading of chemical tankers is a highly automated and intelligent system integration product, and CCS classification society has planned Cl intelligent symbol. Although the automatic loading and unloading function can complete loading and unloading operations, it still has the following defects:

[0003] In the process of loading and unloading, the coordination between the various ship engine systems of the liquid cargo system of the chemical ship in the prior art is not high, resulting in low efficiency when loading and unloading goods.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects and problems existing in the prior art of low coordination between ship engine systems and low loading and unloading efficiency, and to provide an automatic loading and unloading coordination system for chemical tankers with high coordination between ship engine systems and high loading and unloading efficiency.

[0006] To achieve the above objectives, the technical solution of the present invention is: a chemical tanker automatic loading and unloading coordination system, the automatic loading and unloading coordination system includes a wharf and a ship docked at the wharf; the ship includes multiple cargo holds, multiple ballast tanks, multiple cargo pumps and ballast pumps; the cargo hold is provided with a tank inlet valve, a cargo hold outlet valve, a cargo pump and a vent valve, and the ballast tank is provided with a ballast tank inlet and outlet valves; the cargo pump is provided with a cargo pump outlet valve, and the ballast pump is provided with a ballast pump discharge valve, and the ballast pump discharge valve is connected to multiple ballast tanks through a discharge pipeline.

[0007] The ship comprises ten cargo holds, ten ballast tanks, ten cargo pumps and at least one ballast pump. The cargo holds are provided with at least one tank inlet valve, at least one cargo hold outlet valve, at least one cargo pump and at least one vent valve; the ballast tanks are provided with at least one ballast tank inlet and outlet valve; the ballast pump load discharge valve is connected to the ballast tank inlet and outlet valves through a load discharge pipeline.

[0008] A method for using an automatic loading and unloading joint adjustment system for a chemical tanker, the method comprising loading joint adjustment operations and unloading joint adjustment operations;

[0009] The cargo loading joint adjustment operation includes: firstly, opening the cargo hold inlet valve, distributing the cargo hold input flow according to the number and position of the cargo holds and the opening of the cargo hold inlet valve, inputting cargo into the cargo hold, and the liquid level in the cargo hold changes correspondingly with the flow; then, opening the air vent valve to maintain the pressure balance in the cargo hold; at the same time, starting the ballast pump, opening the ballast pump discharge valve and the ballast tank inlet and outlet valves to discharge ballast water out of the ballast tank to maintain the stability of the ship, thereby completing the cargo loading joint adjustment operation;

[0010] The unloading joint adjustment operation includes: first opening the cargo hold outlet valve, then starting the cargo pump, the cargo pump outlet valve is opened, and the output flow of the cargo hold outlet valve is controlled according to the opening of the cargo hold outlet valve and the outlet pressure of the cargo pump to output the goods to the dock, and the liquid level in the cargo hold changes accordingly; then the air valve is opened to maintain the pressure balance in the cargo hold; at the same time, the ballast pump is started, and the ballast pump discharge valve and the ballast tank inlet and outlet valves are opened to add ballast water to the ballast tank to keep the ship stable, thereby completing the unloading joint adjustment operation.

[0011] In the loading coordination operation, the flow quantification formula used in the input flow of the allocated cargo hold is:

[0012] Q ij =K i *(Q0 / i)*(O j / 100) j *(O j / 100)

[0013] Where: i is the number of cargo holds loaded at the same time, that is, the number of cargo hold inlet valves opened, j is the cargo hold code, O is the opening of the cargo hold inlet valve, and K is the proportional coefficient of each cargo hold position;

[0014] The liquid level in the cargo hold changes in accordance with the flow rate, and the cargo hold liquid level quantification formula used is:

[0015] L jr =L j0 +m r *Q j

[0016] Where: j is the cargo hold code, m is the cargo hold ratio coefficient, r is the corresponding segment value, j is the current flow rate of the cargo hold, L j0 is the initial liquid level.

[0017] The cargo hold pressure quantification formula used to maintain the pressure balance in the cargo hold is:

[0018] ΔP j =K j *n / V j

[0019] Where: K j The proportional constant at various temperatures, n is the existing cargo hold gas mass, V j is the empty compartment volume;

[0020] The ballast water is discharged out of the ballast tank to maintain the stability of the ship. The formula for the change of the ballast tank liquid level is:

[0021] L j =L j0 -K 1j *N mj *Q0*(O j / 100) j *(O j / 100)

[0022] Where: j is the ballast tank number, K 1j is a constant, N mj is the proportionality factor of the ballast tank segment, L j0 is the initial liquid level, Q0 is the rated flow of the ballast pump, O j It is the opening degree of the ballast pump discharge valve.

[0023] In the unloading joint operation, first open the cargo hold outlet valve, start the cargo pump, open the cargo pump outlet valve, and control the output flow of the cargo hold outlet valve according to the opening of the cargo hold outlet valve and the outlet pressure of the cargo pump to output the goods to the dock. The cargo pump outlet pressure formula used is:

[0024] P ij =k i *n*(1-O j 2 / 10000)

[0025] Where: i is the number of cargo holds unloaded at the same time, that is, the number of cargo hold outlet valves opened, j is the cargo hold code, j is the opening of the cargo hold outlet valve, n is the speed of the cargo pump, k i is the proportionality coefficient;

[0026] The output flow quantification formula of the cargo hold outlet valve is:

[0027] Q ij =K i *n*O j 2 *P j

[0028] Where: i is the number of cargo holds unloaded at the same time, that is, the number of cargo hold outlet valves opened, j is the cargo hold code, j is the cargo hold outlet valve opening, n is the cargo pump speed, K i is the proportionality coefficient, P j It is the cargo pump outlet pressure.

[0029] The liquid level in the cargo hold changes in accordance with the flow rate, and the cargo hold liquid level quantification formula used is:

[0030] L jr =L j0 -m r *Q j

[0031] Where: j is the cargo hold code, m is the cargo hold ratio coefficient, r is the corresponding 100 segment value, Q j is the current flow rate of the cargo hold, L j0 is the initial liquid level;

[0032] The cargo hold pressure quantification formula used to maintain the pressure balance in the cargo hold is:

[0033] ΔP j =K j *n / V j

[0034] Where: K j The proportional constant at various temperatures, n is the existing cargo hold gas mass, V j is the empty compartment volume.

[0035] The ballast water is added to the ballast tank to keep the ship stable. The formula used for the change of the ballast tank liquid level is:

[0036] L j =L j0 +K 1j *N mj *Q0*(O j / 100) j *(O j / 100)

[0037] Where: j is the ballast tank number, K 1j is a constant, N mj is the proportionality factor of the ballast tank segment, L j0is the initial liquid level, Q0 is the rated flow of the ballast pump, O j It is the opening degree of the ballast pump discharge valve.

[0038] The cargo hold inlet valve, cargo hold outlet valve and ballast pump discharge valve are opening valves; the ballast tank inlet and outlet valves and the vent valve are switch valves.

[0039] The opening of the opening valve is from 0% to 100%, and the time used is 20 seconds to 30 seconds; the opening of the opening valve is from 100% to 0%, and the time used is 20 seconds to 30 seconds;

[0040] The time taken for the switch valve to be opened and closed is 10 seconds to 15 seconds; the time taken for the switch valve to be closed and opened is 10 seconds to 15 seconds.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The present invention discloses an automatic loading and unloading joint adjustment system for a chemical tanker, which comprises a plurality of cargo holds, a plurality of ballast tanks, a plurality of cargo pumps and a ballast pump; the cargo hold is provided with a hold inlet valve, a hold outlet valve, a cargo pump and a vent valve, and the ballast tank is provided with a ballast tank inlet and outlet valve; the cargo pump is provided with a cargo pump outlet valve, and the ballast pump is provided with a ballast pump discharge valve, which is connected to a plurality of ballast tanks through a discharge pipeline; when used, the system first opens the cargo hold inlet valve in the loading joint adjustment operation, distributes the input flow of the cargo hold according to the number and position of the cargo holds and the opening of the cargo hold inlet valve, inputs goods into the cargo hold, and the liquid level in the cargo hold changes correspondingly with the flow; then the vent valve is opened to maintain the pressure balance in the cargo hold; at the same time, the ballast pump is started, The ballast pump discharge valve and the ballast tank inlet and outlet valves are opened to discharge ballast water outside the ballast tank to keep the ship stable, thereby completing the loading joint adjustment operation; in the unloading joint adjustment operation, the system first opens the cargo hold outlet valve, then starts the cargo pump, and opens the cargo pump outlet valve. According to the opening of the cargo hold outlet valve and the outlet pressure of the cargo pump, the output flow of the cargo hold outlet valve is controlled to output goods to the dock, and the liquid level in the cargo hold changes accordingly with the flow; then the air-permeable valve is opened to maintain the pressure balance in the cargo hold; at the same time, the ballast pump is started, and the ballast pump discharge valve and the ballast tank inlet and outlet valves are opened to discharge ballast water into the ballast tank to keep the ship stable, thereby completing the unloading joint adjustment operation; through the mutual linkage operation of the joint adjustment system, the coordination between various ship and machine systems is improved. Therefore, the present invention can not only perform loading and unloading joint adjustment operations, but also has a high degree of coordination between ship and machine systems.

[0043] 2. In the automatic loading and unloading joint adjustment system of a chemical tanker of the present invention, the efficiency of loading and unloading operations is improved by mathematically calculating the joint adjustment relationship between the cargo hold flow, cargo hold pressure, cargo hold liquid level, ballast tank pressure drainage and other systems during the loading and unloading process. Therefore, the present invention can not only perform loading and unloading joint adjustment operations, but also has a high loading and unloading efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a system schematic diagram of the cargo hold in the present invention.

[0045] Figure 2 It is a system schematic diagram of the ballast tank in the present invention.

[0046] Figure 3 It is a cross-sectional view of the cargo hold and the ballast tank in the present invention.

[0047] In the figure: cargo hold 1, ballast tank 2, cargo pump 3, ballast pump 4, dirty oil tank 5, fore peak tank 6, aft peak tank 7. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0049] See also Figure 1 — Figure 3 A chemical tanker automatic loading and unloading coordination system, the automatic loading and unloading coordination system includes a wharf and a ship docked at the wharf; the ship includes multiple cargo holds 1, multiple ballast tanks 2, multiple cargo pumps 3 and ballast pumps 4; the cargo hold 1 is provided with a tank inlet valve, a cargo hold outlet valve, a cargo pump and a vent valve, the ballast tank 2 is provided with ballast tank inlet and outlet valves; the cargo pump 3 is provided with a cargo pump outlet valve, the ballast pump 4 is provided with a ballast pump discharge valve, and the ballast pump discharge valve is connected to multiple ballast tanks through a discharge pipeline.

[0050] The ship comprises ten cargo holds 1, ten ballast tanks 2, ten cargo pumps 3 and at least one ballast pump 4. The cargo holds 1 are provided with at least one tank inlet valve, at least one cargo hold outlet valve, at least one cargo pump and at least one vent valve; the ballast tank 2 is provided with at least one ballast tank inlet and outlet valve; the ballast pump discharge valve is connected to the ballast tank inlet and outlet valves through a discharge pipeline.

[0051] A method for using an automatic loading and unloading joint adjustment system for a chemical tanker, the method comprising loading joint adjustment operations and unloading joint adjustment operations;

[0052] The loading joint adjustment operation includes: firstly, opening the cargo hold inlet valve, distributing the input flow of cargo hold 1 according to the number and position of cargo holds 1 and the opening of the cargo hold inlet valve, inputting goods into cargo hold 1, and the liquid level height in cargo hold 1 changes correspondingly with the flow; then opening the air-permeable valve to maintain the pressure balance in cargo hold 1; at the same time, starting the ballast pump 4, opening the ballast pump discharge valve and the ballast tank inlet and outlet valves to discharge ballast water out of the ballast tank 2, and maintaining the stability of the ship, thereby completing the loading joint adjustment operation;

[0053] The unloading joint adjustment operation includes: first opening the cargo hold outlet valve, then starting the cargo pump 3, the cargo pump outlet valve is opened, and the output flow of the cargo hold outlet valve is controlled according to the opening of the cargo hold outlet valve and the outlet pressure of the cargo pump 3, and the goods are exported to the dock. The liquid level height in the cargo hold 1 changes accordingly with the flow rate; then the air valve is opened to maintain the pressure balance in the cargo hold 1; at the same time, the ballast pump 4 is started, and the ballast pump discharge valve and the ballast tank inlet and outlet valves are opened to add ballast water to the ballast tank 2 to keep the ship stable, thereby completing the unloading joint adjustment operation.

[0054] In the loading coordination operation, the flow quantification formula used in the input flow of the distribution cargo hold 1 is:

[0055] Q ij =K i *(Q0 / i)*(O j / 100) j *(O j / 100)

[0056] Where: i is the number of cargo holds loaded at the same time, that is, the number of cargo hold inlet valves opened, j is the cargo hold code, O is the opening of the cargo hold inlet valve, and K is the proportional coefficient of each cargo hold position;

[0057] The liquid level in the cargo hold 1 changes in accordance with the flow rate, and the cargo hold liquid level quantification formula used is:

[0058] L jr =L j0 +m r *Q j

[0059] Where: j is the cargo hold code, m is the cargo hold ratio coefficient, r is the corresponding segment value, j is the current flow rate of the cargo hold, L j0 is the initial liquid level.

[0060] The cargo hold pressure quantification formula used to maintain the pressure balance in the cargo hold 1 is:

[0061] ΔP j =K j *n / V j

[0062] Where: K j The proportional constant at various temperatures, n is the existing cargo hold gas mass, V j is the empty compartment volume;

[0063] The ballast water is discharged from the ballast tank 2 to maintain the stability of the ship. The formula used for the change of the ballast tank liquid level is:

[0064] L j =L j0 -K 1j *N mj *Q0*(O j / 100) j *(O j / 100)

[0065] Where: j is the ballast tank number, K 1j is a constant, N mj is the proportionality factor of the ballast tank segment, L j0 is the initial liquid level, Q0 is the rated flow of the ballast pump, O j It is the opening degree of the ballast pump discharge valve.

[0066] In the unloading joint operation, first open the cargo hold outlet valve, start the cargo pump 3, open the cargo pump outlet valve, and control the output flow of the cargo hold outlet valve according to the opening of the cargo hold outlet valve and the outlet pressure of the cargo pump to output the goods to the dock. The cargo pump outlet pressure formula used is:

[0067] P ij =k i *n*(1-O j 2 / 10000)

[0068] Where: i is the number of cargo holds unloaded at the same time, that is, the number of cargo hold outlet valves opened, j is the cargo hold code, Oj is the opening of the cargo hold outlet valve, n is the speed of the cargo pump, k is the speed of the cargo pump, i is the proportionality coefficient;

[0069] The output flow quantification formula of the cargo hold outlet valve is:

[0070] Q ij =K i *n*O j 2 *P j

[0071] Where: i is the number of cargo holds unloaded at the same time, that is, the number of cargo hold outlet valves opened, j is the cargo hold code, j is the cargo hold outlet valve opening, n is the cargo pump speed, K i is the proportionality coefficient, Pj It is the cargo pump outlet pressure.

[0072] The liquid level in the cargo hold 1 changes in accordance with the flow rate, and the cargo hold liquid level quantification formula used is:

[0073] L jr =L j0 -m r *Q j

[0074] Where: j is the cargo hold code, m is the cargo hold ratio coefficient, r is the corresponding 100 segment value, Q j is the current flow rate of the cargo hold, L j0 is the initial liquid level;

[0075] The cargo hold pressure quantification formula used to maintain the pressure balance in the cargo hold 1 is:

[0076] ΔP j =K j *n / V j

[0077] Where: K j The proportional constant at various temperatures, n is the existing cargo hold gas mass, V j is the empty compartment volume.

[0078] The ballast water is added to the ballast tank 2 to keep the ship stable. The formula used for the change of the ballast tank liquid level is:

[0079] L j =L j0 +K 1j *N mj *Q0*(O j / 100) j *(O j / 100)

[0080] Where: j is the ballast tank number, K 1j is a constant, N mj is the proportionality factor of the ballast tank segment, L j0 is the initial liquid level, Q0 is the rated flow of the ballast pump, O j It is the opening degree of the ballast pump discharge valve.

[0081] The cargo hold inlet valve, cargo hold outlet valve and ballast pump discharge valve are opening valves; the ballast tank inlet and outlet valves and the vent valve are switch valves.

[0082] The opening of the opening valve is from 0% to 100%, and the time used is 20 seconds to 30 seconds; the opening of the opening valve is from 100% to 0%, and the time used is 20 seconds to 30 seconds;

[0083] The time taken for the switch valve to be opened and closed is 10 seconds to 15 seconds; the time taken for the switch valve to be closed and opened is 10 seconds to 15 seconds.

[0084] The principle of the present invention is described as follows:

[0085] When the opening or closing command of the opening valve is issued, the opening of the opening valve opens linearly from 0% to 100% within 0 seconds to 30 seconds, and the opening of the opening valve directly affects the current valve output flow; similarly, the input and output flow of the ballast tank is determined by the capacity of the ballast pump. Assuming that the maximum flow of the ballast pump is 300m 3 / h, that is, 100% opening corresponds to 300m 3 / h, opening degree 0 corresponds to 0m 3 / h, and adopts linear opening, then when the total flow is constant, the joint control system divides the input and output flows equally according to the number of inlet and outlet valves of the ballast tank.

[0086] Embodiment 1:

[0087] See also Figure 1 — Figure 3 , a chemical tanker automatic loading and unloading coordination system, the automatic loading and unloading coordination system includes a wharf and a ship docked at the wharf; the ship includes multiple cargo holds 1, multiple ballast tanks 2, multiple cargo pumps 3 and ballast pumps 4; the cargo hold 1 is provided with a tank inlet valve, a cargo hold outlet valve, a cargo pump and a vent valve, the ballast tank 2 is provided with a ballast tank inlet and outlet valves; the cargo pump 3 is provided with a cargo pump outlet valve, the ballast pump 4 is provided with a ballast pump load discharge valve, and the ballast pump load discharge valve is connected to multiple ballast tanks through a load discharge pipeline; preferably, the ballast pump is a fixed-frequency motor driven pump room pump, which adopts star-delta starting; the cargo pump is an electric deep well pump with a stepless speed regulation function.

[0088] A method for using an automatic loading and unloading joint adjustment system for a chemical tanker, the method comprising loading joint adjustment operation and unloading joint adjustment operation; the loading joint adjustment operation comprises: firstly, opening the cargo hold inlet valve, distributing the input flow of cargo hold 1 according to the number and position of cargo hold 1 and the opening degree of the cargo hold inlet valve, inputting goods into cargo hold 1, and the liquid level height in cargo hold 1 changes correspondingly with the flow rate; then opening the air vent valve to maintain the pressure balance in cargo hold 1; at the same time, starting the ballast pump 4, opening the ballast pump discharge valve and the ballast tank inlet and outlet valves to discharge ballast water out of the ballast tank 2 to maintain the stability of the ship The cargo unloading joint adjustment operation includes: firstly, opening the cargo hold outlet valve, and then starting the cargo pump 3, the cargo pump outlet valve is opened, and the output flow of the cargo hold outlet valve is controlled according to the opening of the cargo hold outlet valve and the outlet pressure of the cargo pump 3, and the goods are output to the wharf, and the liquid level height in the cargo hold 1 changes accordingly with the flow rate; then the air valve is opened to keep the pressure balance in the cargo hold 1; at the same time, the ballast pump 4 is started, and the ballast pump discharge valve and the ballast tank inlet and outlet valves are opened to add ballast water to the ballast tank 2 to keep the ship stable, thereby completing the cargo unloading joint adjustment operation.

[0089] Embodiment 2:

[0090] The basic content is the same as that of Example 1, except that:

[0091] The ship comprises ten cargo holds 1, ten ballast tanks 2, ten cargo pumps 3 and at least one ballast pump 4. The cargo holds 1 are provided with at least one tank inlet valve, at least one cargo hold outlet valve, at least one cargo pump and at least one vent valve; the ballast tank 2 is provided with at least one ballast tank inlet and outlet valve; the ballast pump discharge valve is connected to the ballast tank inlet and outlet valves through a discharge pipeline.

[0092] Furthermore, the ship also includes two dirty oil tanks 5 for loading and unloading waste oil; and a forepeak tank 6 and a sternpeak tank 7 for stabilizing the ship, coping with shear force and adjusting bending moment.

[0093] Embodiment 3:

[0094] The basic content is the same as that of Example 1, except that:

[0095] In the loading coordination operation, the flow rate of the port terminal is assumed to be a fixed value Q0, and the input flow rate of cargo hold 1 is allocated according to the number and position of cargo hold 1 and the opening of the cargo hold inlet valve. The flow quantification formula used in allocating the input flow rate of cargo hold 1 is:

[0096] Q ij =K i *(Q0 / i)*(O j / 100) j *(O j / 100)

[0097] Where: i is the number of cargo holds loaded at the same time, that is, the number of cargo hold inlet valves opened, j is the cargo hold code, O is the opening of the cargo hold inlet valve, and K is the proportional coefficient of each cargo hold position;

[0098] Furthermore, the maximum flow rate of a chemical tanker cargo tank is 200m 3 / h;

[0099] The liquid level in the cargo hold 1 changes in accordance with the flow rate. The flow rate of each cargo hold corresponds to the liquid level. The liquid level of each cargo hold is divided into 100 sections. Each section represents a proportional coefficient between the liquid level and the flow rate. The cargo hold liquid level quantification formula used is:

[0100] L jr =L j0 +m r *Q j

[0101] Where: j is the cargo hold code, m is the cargo hold ratio coefficient, r is the corresponding segment value, j is the current flow rate of the cargo hold, L j0 is the initial liquid level;

[0102] The quantification of cargo hold pressure is related to the flow rate of the cargo hold during loading and debugging and the state of the vent valve. The vent valve has the following states: fully open, fully closed and stuck; the stuck state is any value of the vent valve opening of 0%-100%;

[0103] The corresponding relationship between the state of the vent valve and the cargo hold pressure is any one of the following:

[0104] When the vent valve is fully open, the cargo hold pressure is maintained at an ideal state;

[0105] When the vent valve is fully closed, the cargo hold pressure changes significantly with the amount of cargo loaded, i.e., as the amount of cargo loaded increases, the pressure increases; and as the amount of cargo loaded decreases, the pressure decreases.

[0106] When the vent valve is fully closed, the pressure in the cargo hold becomes low during the unloading operation, and the unloading operation cannot be continued; the pressure in the cargo hold becomes high during the loading operation, and the loading operation cannot be continued;

[0107] The cargo hold pressure quantification formula used for the cargo hold pressure change rate is:

[0108] ΔP j =K j *n / V j

[0109] Where: K jThe proportional constant at various temperatures, n is the existing cargo hold gas mass, V j is the empty compartment volume;

[0110] The ballast water is discharged from the ballast tank 2 to maintain the stability of the ship. The formula used for the change of the ballast tank liquid level is:

[0111] L j =L j0 -K 1j *N mj *Q0*(O j / 100) j *(O j / 100)

[0112] Where: j is the ballast tank number, K 1j is a constant, N mj is the proportionality factor of the ballast tank segment, L j0 is the initial liquid level, Q0 is the rated flow of the ballast pump, O j It is the opening degree of the ballast pump discharge valve.

[0113] Embodiment 4:

[0114] The basic content is the same as that of Example 1, except that:

[0115] In the unloading joint adjustment operation, first open the cargo hold outlet valve, start the cargo pump, open the cargo pump outlet valve, and control the output flow of the cargo hold outlet valve according to the opening of the cargo hold outlet valve and the outlet pressure of the cargo pump to output the goods to the dock. The cargo pump outlet pressure is related to the speed and the cargo pump outlet valve. The higher the speed, the smaller the outlet valve, and the higher the cargo pump outlet pressure. The cargo pump outlet pressure formula used is:

[0116] P ij =k i *n*(1-O j 2 / 10000)

[0117] Where: i is the number of cargo holds unloaded at the same time, that is, the number of cargo hold outlet valves opened, j is the cargo hold code, j is the opening of the cargo hold outlet valve, n is the speed of the cargo pump, k i is the proportionality coefficient;

[0118] In the unloading joint operation, the cargo pump in cargo hold 1 delivers the cargo to the wharf. The port wharf has control requirements for the head and flow rate. The head is the outlet pressure of the cargo pump. At this time, the flow rate of the cargo hold is determined according to the working status of the valve and cargo pump.

[0119] The output flow quantification formula of the cargo hold outlet valve is:

[0120] Qij =K i *n*O j 2 *P j

[0121] Where: i is the number of cargo holds unloaded at the same time, that is, the number of cargo hold outlet valves opened, j is the cargo hold code, j is the cargo hold outlet valve opening, n is the cargo pump speed, K i is the proportionality coefficient, P j is the cargo pump outlet pressure;

[0122] Furthermore, the cargo pump outlet pressure shall not exceed 0.6Mpa; the number of cargo pumps working at the same time shall be ≤4.

[0123] The liquid level in the cargo hold changes in accordance with the flow rate, and the cargo hold liquid level quantification formula used is:

[0124] L jr =L j0 -m r *Q j

[0125] Where: j is the cargo hold code, m is the cargo hold ratio coefficient, r is the corresponding 100 segment value, Q j is the current flow rate of the cargo hold, L j0 is the initial liquid level;

[0126] The cargo hold pressure quantification formula used to maintain the pressure balance in the cargo hold is:

[0127] ΔP j =K j *n / V j

[0128] Where: K j The proportional constant at various temperatures, n is the existing cargo hold gas mass, V j is the empty compartment volume;

[0129] The ballast water is added to the ballast tank to keep the ship stable. The formula used for the change of the ballast tank liquid level is:

[0130] L j =L j0 +K 1j *N mj *Q0*(O j / 100) j *(O j / 100)

[0131] Where: j is the ballast tank number, K 1j is a constant, N mjis the proportionality factor of the ballast tank segment, L j0 is the initial liquid level, Q0 is the rated flow of the ballast pump, O j It is the opening degree of the ballast pump discharge valve.

[0132] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A method for using a chemical tanker automatic loading and unloading joint adjustment system, characterized in that: The automatic loading and unloading cargo coordination system comprises a wharf and a ship docked at the wharf; the ship comprises a plurality of cargo holds (1), a plurality of ballast tanks (2), a plurality of cargo pumps (3) and a ballast pump (4); the cargo hold (1) is provided with a hold inlet valve, a cargo hold outlet valve, a cargo pump and a vent valve, the ballast tank (2) is provided with a ballast tank inlet and outlet valve; the cargo pump (3) is provided with a cargo pump outlet valve, the ballast pump (4) is provided with a ballast pump discharge valve, and the ballast pump discharge valve is connected to the plurality of ballast tanks via a discharge pipeline; The method for using the automatic loading and unloading joint adjustment system includes loading joint adjustment operation and unloading joint adjustment operation; The cargo loading and adjustment operation comprises: firstly, opening the cargo hold inlet valve, distributing the input flow of the cargo hold (1) according to the number and position of the cargo holds (1) and the opening degree of the cargo hold inlet valve, inputting cargo into the cargo hold (1), and the liquid level height in the cargo hold (1) changes correspondingly to the flow; then, opening the air vent valve to maintain the pressure balance in the cargo hold (1); at the same time, starting the ballast pump (4), opening the ballast pump discharge valve and the ballast tank inlet and outlet valves to discharge ballast water out of the ballast tank (2), and maintaining the stability of the ship, thereby completing the cargo loading and adjustment operation; The cargo unloading joint adjustment operation comprises: firstly, opening the cargo hold outlet valve, then starting the cargo pump (3), opening the cargo pump outlet valve, controlling the output flow of the cargo hold outlet valve according to the opening degree of the cargo hold outlet valve and the outlet pressure of the cargo pump (3), and outputting the cargo to the wharf, and the liquid level height in the cargo hold (1) changes correspondingly with the flow; then opening the air vent valve to maintain the pressure balance in the cargo hold (1); at the same time, starting the ballast pump (4), opening the ballast pump discharge valve and the ballast tank inlet and outlet valves to discharge ballast water into the ballast tank (2), and maintaining the stability of the ship, thereby completing the cargo unloading joint adjustment operation; In the loading coordination operation, the flow quantification formula used in the input flow of the distribution cargo hold (1) is: Q ij =K ij *(Q0 / i)*(O j / 100*(O j / 100); Where: i is the number of cargo holds loaded at the same time, that is, the number of cargo hold inlet valves opened; j is the cargo hold code, Q0 is the flow rate of the port terminal; j is the opening of the cargo hold inlet valve; K ij is the location coefficient for each cargo hold; The liquid level in the cargo hold (1) changes in accordance with the flow rate, and the cargo hold liquid level quantification formula used is: L jr =L j0 +m r *Q j ; Where: j is the cargo hold code, m is the cargo hold code r is the cargo hold segment ratio coefficient, r is the corresponding segment value, Q j is the current flow rate of the cargo hold, L j0 is the initial liquid level.

2. The method for using the automatic loading and unloading coordination system for a chemical tanker according to claim 1 is characterized in that: The ship comprises ten cargo holds (1), ten ballast tanks (2), ten cargo pumps (3) and at least one ballast pump (4); the cargo holds (1) are provided with at least one tank inlet valve, at least one cargo hold outlet valve, at least one cargo pump and at least one vent valve; the ballast tanks (2) are provided with at least one ballast tank inlet and outlet valve; the ballast pump discharge valve is connected to the ballast tank inlet and outlet valves via a discharge pipeline.

3. The method for using the automatic loading and unloading coordination system for a chemical tanker according to claim 1 is characterized in that: The cargo hold pressure quantification formula used to maintain the pressure balance in the cargo hold (1) is: ΔP j =K j *n / V j ; Where: K j is the proportional constant at various temperatures, n is the existing cargo hold gas mass, V j is the empty compartment volume; The ballast water is discharged to the ballast tank (2) to maintain the stability of the ship. The formula for the change of the ballast tank liquid level is: L j =L j0 -TO 1j *Nmj*Q0*(O j / 100*(O j / 100); Where: j is the ballast tank number, K 1j is a constant, N mj is the proportionality factor of the ballast tank segment, L j0 is the initial liquid level, Q0 is the rated flow of the ballast pump, O j It is the opening degree of the ballast pump discharge valve.

4. The method for using the automatic loading and unloading coordination system for a chemical tanker according to claim 1 is characterized in that: In the cargo unloading joint adjustment operation, the cargo hold outlet valve is first opened, the cargo pump (3) is started, the cargo pump outlet valve is opened, and the output flow of the cargo hold outlet valve is controlled according to the opening of the cargo hold outlet valve and the outlet pressure of the cargo pump to output the cargo to the dock. The cargo pump outlet pressure formula used is: P ij =K i *n*(1-O j 2 / 10000); Where: P ij K is the outlet pressure of the jth cargo pump when the number of cargo pumps is i and running simultaneously; i is the proportionality coefficient; O j is the opening of the cargo hold outlet valve; n is the speed of the cargo pump; The output flow quantification formula of the cargo hold outlet valve is: Q ij =K i *n*O j 2 *P j ; Where: i is the number of cargo holds unloaded at the same time, that is, the number of cargo hold outlet valves opened, j is the cargo hold code, j is the cargo hold outlet valve opening, n is the cargo pump speed, P j It is the cargo pump outlet pressure.

5. The method for using the automatic loading and unloading coordination system for a chemical tanker according to claim 1 is characterized in that: The liquid level in the cargo hold (1) changes in accordance with the flow rate, and the cargo hold liquid level quantification formula used is: L jr =L j0 -m r *Q j ; Where: j is the cargo hold code, m is the cargo hold code r is the cargo hold segment ratio coefficient, r is the corresponding segment value, Q j is the current flow rate of the cargo hold, L j0 is the initial liquid level; The cargo hold pressure quantification formula used to maintain the pressure balance in the cargo hold (1) is: ΔP j =K j *n / V j ; Where: K j The proportional constant at various temperatures, n is the existing cargo hold gas mass, V j is the empty compartment volume.

6. The method for using the automatic loading and unloading coordination system for a chemical tanker according to claim 5 is characterized by: The ballast water is added to the ballast tank (2) to maintain the stability of the ship. The formula used for the change of the ballast tank liquid level is: L j =L j0 +K 1j *N mj *Q0*(O j / 100*(O j / 100); Where: j is the ballast tank number, K 1j is a constant, N mj is the proportionality factor of the ballast tank segment, L j0 is the initial liquid level, Q0 is the rated flow of the ballast pump, O j It is the opening degree of the ballast pump discharge valve.

7. The method for using the automatic loading and unloading coordination system for a chemical tanker according to claim 1 is characterized in that: The cargo hold inlet valve, cargo hold outlet valve and ballast pump discharge valve are opening valves; the ballast tank inlet and outlet valves and the vent valve are switch valves.

8. The method for using the automatic loading and unloading coordination system for a chemical tanker according to claim 7 is characterized in that: The opening of the opening valve is from 0% to 100%, and the time used is 20 seconds to 30 seconds; the opening of the opening valve is from 100% to 0%, and the time used is 20 seconds to 30 seconds; The time taken for the switch valve to be opened and closed is 10 seconds to 15 seconds; the time taken for the switch valve to be closed and opened is 10 seconds to 15 seconds.

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