Novel drag suction dredger FGSS control system

Abstract

The invention discloses a novel drag suction dredger FGSS control system, and the system comprises a control monitoring module which is provided with instrument equipment and is used for carrying out the local or remote reading of important parameters of the whole gas; the control module is used for operating each device to issue a start-stop command; the safety module is used for automatically closing the gas fuel supply system when a fault occurs and other faults which are too fast in development speed and are too late for manual intervention; the LNG supply module is used for executing commands of the control monitoring module and the safety module, gasifying the LNG and conveying the LNG to the gas utilization module at constant pressure and temperature; and the BOG supply unit is used for executing commands of the control monitoring module and the safety module and conveying BOG to the gas consumption module at constant pressure and temperature. In the gas supply process, online switching between the LNG pump gas supply mode and the BOG gas supply mode can be achieved, BOG generated by the LNG storage tank is fully utilized, and the energy utilization rate is increased.

Description

Technical Field

[0001] The invention relates to a novel FGSS (gas supply system) control system of a trailing suction dredger. Background Art

[0002] In recent years, as my country has continuously put forward higher requirements for low-carbon and environmental protection standards in the shipping industry, the importance of upgrading and transforming the latest generation of green, energy-saving and environmentally friendly ships and existing fleet technologies has been increasing. LNG (liquefied natural gas) fuel has been widely used around the world and is widely recognized as the preferred large-scale clean alternative fuel. It has been widely used in passenger ships, cruise ships, LNG carriers, tankers, container ships and other ship types.

[0003] During the storage process, LNG will inevitably absorb heat from the external environment and vaporize to produce BOG (flash steam). The traditional treatment methods are: first, discharge through a vent pipe, which pollutes the environment; second, pressurize and supply gas through a BOG compressor, which not only requires a large investment but also has high maintenance and use costs; while heating BOG through a BOG heater and supplying BOG to a gas-using unit with a lower intake pressure requires not only a small investment but also low maintenance and use costs; the LNG fuel supply control system can realize automatic switching between LNG gas supply mode and BOG gas supply mode; in an emergency, all gas supply pipelines can be automatically cut off to confine dangerous gases in the fuel tank skid. Summary of the invention

[0004] The purpose of the present invention is to overcome the existing defects and provide a new type of FGSS control system for a trailing suction dredger, which can realize online switching between the LNG pump gas supply mode and the BOG gas supply mode during the gas supply process, fully utilize the BOG generated by the LNG storage tank, and improve the energy utilization rate.

[0005] The technical solution to achieve the above purpose is:

[0006] A new type of FGSS control system for trailing suction hopper dredger, including:

[0007] The control and monitoring module is equipped with instrumentation equipment, which is used to read the important parameters of the entire gas combustion locally or remotely; to operate each device to issue opening and closing commands; and to alarm when the remote control valve fails to open or close or the instrument value fails;

[0008] Safety module for automatically shutting down the gas fuel supply system in the event of a fault or other failure that develops too quickly for human intervention;

[0009] LNG gas supply module, used to execute the commands of the control monitoring module and the safety module, and gasify LNG and deliver it to the gas using module at a constant pressure and temperature;

[0010] BOG gas supply unit, used to execute the commands of the control monitoring module and the safety module, and deliver BOG to the gas using module at a constant pressure and temperature;

[0011] The gas consumption module is used to consume gas, wherein the gas consumption equipment includes an auxiliary generator and a hot water heater.

[0012] Preferably, the control monitoring module issues opening and closing commands to various devices; the various devices include but are not limited to remote control valves, LNG pumps, water glycol pumps and fans, and the devices that issue opening and closing commands to various devices include but are not limited to buttons;

[0013] The control monitoring module performs an alarm operation when there is a failure in opening or closing of the remote control valve or an error in the instrument value;

[0014] The alarm operation in the control monitoring module adopts Siemens redundant PLC, and the CPU is redundant in the PROFINET ring network. Two identical CPUs are synchronized through redundant connections.

[0015] Preferably, the safety module adopts Siemens redundant PLC, and the CPU is redundant in the PROFINET ring network, and two identical CPUs are synchronized through redundant connections.

[0016] Preferably, the LNG gas supply module receives an opening or closing command from the control and monitoring module to open or close the fan and the nitrogen system;

[0017] The LNG gas supply module determines whether the state of the blower is on. If it is on and the nitrogen pressure is normally greater than 4.1 Bar, it returns a signal to the control monitoring module and issues a command to start the water glycol system.

[0018] The LNG gas supply module receives the opening or closing command from the control and monitoring module to open or close the water glycol system;

[0019] The LNG gas supply module determines whether the water glycol temperature in the water glycol system is greater than 40° C., and reminds the staff to open the reflux valve, and the reflux valve opening is greater than 40%;

[0020] The LNG gas supply module determines whether the reflux valve is open and whether the reflux valve opening is greater than 40%. If so, the pump outlet valve and the LNG pump are automatically opened;

[0021] The LNG gas supply module determines whether the pressure difference at the pump outlet valve is greater than 0.5 Bar, and if so, automatically opens the vaporizer LNG inlet valve;

[0022] The LNG gas supply module determines whether the buffer tank pressure is greater than 6.5 Bar. If so, it sends a gas ready signal to the control monitoring module, and is in the LNG gas supply mode to supply gas to the gas using module.

[0023] Preferably, in the LNG gas supply module, in the LNG gas supply mode, the LNG pump, the LNG storage tank, the LNG heat exchanger cooperate with relevant remote control valve instruments to complete the gas supply to the gas consumption module.

[0024] Preferably, in the LNG gas supply module, if there is a failure in opening or closing of the remote control valve or an instrument value error, the LNG supply will be stopped, and the operation will be restarted after the corresponding fault processing.

[0025] Preferably, the BOG gas supply module determines the current LNG storage tank pressure value when in the LNG gas supply mode;

[0026] When the pressure of the LNG storage tank is higher than 3 barg, the BOG gas supply module will pop up a BOG management mode reminder, enter the BOG management state, and manually select to enter the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode;

[0027] The BOG gas supply module is in the BOG management state, when the LNG storage tank pressure is higher than 7 barg, and there is no operator confirmation within 30 seconds, it automatically switches to the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode; and is used to automatically exit the BOG management state and switch to the LNG gas supply mode when it is currently in the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode and the current tank pressure is lower than 5.5 barg.

[0028] Preferably, in the BOG gas supply module, when the pressure of the LNG storage tank is higher than 3 barg, a BOG management mode reminder pops up and the module enters the BOG management state. If the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode is not manually selected, the module remains in the LNG gas supply mode. If the module is in the BOG management state and when the pressure of the LNG storage tank is lower than 2 barg, the module automatically exits the BOG management state and switches to the LNG gas supply mode.

[0029] Preferably, in the BOG gas supply module, in the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode, the gas supply to the gas-using module can be completed by relying on the pressure of the LNG storage tank itself and the BOG heat exchanger in conjunction with relevant remote control valve instruments.

[0030] The beneficial effects of the present invention are as follows: the present invention can realize online switching between the LNG pump gas supply mode and the BOG gas supply mode during the gas supply process, the switching process can be completed automatically, and the gas supply pressure and temperature can be kept stable during the switching process, and will not affect the operation of the gas-using unit; the downtime risk during the switching of the gas supply mode is reduced, and the BOG generated by the LNG storage tank is fully utilized, thereby improving the utilization rate of energy; at the same time, the highly automated gas supply system also greatly reduces the workload of the crew. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a module diagram of a novel FGSS control system of a trailing suction dredger of the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, a novel FGSS control system for a trailing suction hopper dredger comprises: a control and monitoring module 1, a safety module 2, an LNG gas supply module 3, a BOG gas supply module 4 and a gas use module 5.

[0035] The control monitoring module 1 is provided with instrument equipment for reading important parameters of the entire gas combustion locally or remotely; for operating each device to issue opening and closing commands; and for performing alarm operations when the remote control valve fails to open or close or the instrument value fails. The remote control valves include but are not limited to the reflux valve, inlet valve, outlet valve, LNG main valve and BOG main valve.

[0036] The control monitoring module 1 issues opening and closing commands to various devices; the various devices include but are not limited to remote control valves, LNG pumps, water glycol pumps and fans, and the devices that issue opening and closing commands to various devices include but are not limited to buttons.

[0037] The control monitoring module 1 performs an alarm operation when there is a failure in opening or closing of the remote control valve or an error in the value of the instrument.

[0038] In the embodiment, after the control monitoring module 1 sends out a ready signal, the system waits for 5 minutes to be in a hot standby state. If no gas supply-related signal is received after 5 minutes, the gas supply stop procedure will be performed.

[0039] In the embodiment, the alarm operation in the control monitoring module 1 and the safety module 2 are both Siemens redundant PLCs, and the CPUs are redundant in the PROFINET ring network, and two identical CPUs are synchronized through redundant connections.

[0040] The LNG gas supply module 3 is used to execute the commands of the control and monitoring module 1 and the safety module 2, and gasify the LNG and deliver it to the gas use module 5 at a constant pressure and temperature.

[0041] The LNG gas supply module 3 receives the opening or closing command from the control and monitoring module 1, and opens or closes the fan and the nitrogen system.

[0042] The LNG gas supply module 3 determines whether the status of the blower is on. If it is on and the nitrogen pressure is normally greater than 4.1 Bar, it returns a signal to the control and monitoring module 1 and issues a command to start the water glycol system.

[0043] The LNG gas supply module 3 receives the opening or closing command from the control and monitoring module 1, and opens or closes the water glycol system.

[0044] The LNG gas supply module 3 determines whether the water glycol temperature in the water glycol system is greater than 40° C., and reminds the staff to open the reflux valve, and the reflux valve opening is greater than 40%.

[0045] The LNG gas supply module 3 determines whether the reflux valve is open and whether the opening degree of the reflux valve is greater than 40%. If so, the pump outlet valve and the LNG pump are automatically opened.

[0046] The LNG gas supply module 3 determines whether the pressure difference at the pump outlet valve is greater than 0.5 Bar, and if so, automatically opens the vaporizer LNG inlet valve.

[0047] The LNG gas supply module 3 determines whether the buffer tank pressure is greater than 6.5 Bar. If so, it sends a gas ready signal to the control monitoring module 1 and supplies gas to the gas using module 5 in the LNG gas supply mode.

[0048] In the embodiment, in the LNG gas supply mode, the LNG pump, the LNG storage tank, the LNG heat exchanger cooperate with the relevant remote control valve instruments to complete the gas supply to the gas module 5.

[0049] In the embodiment, if there is a failure in opening or closing of the remote control valve or an instrument value error, the LNG supply will be stopped, and the operation will be restarted after the corresponding fault processing.

[0050] The BOG gas supply module 4 is used to execute the commands of the control and monitoring module 1 and the safety module 2 to deliver BOG to the gas use module 5 at a constant pressure and temperature.

[0051] The BOG gas supply module 4 determines the current pressure value of the LNG storage tank when in the LNG gas supply mode.

[0052] When the pressure of the LNG storage tank is higher than 3 barg, the BOG gas supply module 4 pops up a BOG management mode reminder, enters the BOG management state, and manually selects to enter the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode.

[0053] In the embodiment, when the pressure of the LNG storage tank is higher than 3 barg, a BOG management mode reminder pops up and the system enters the BOG management state. If the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode is not manually selected, the system remains in the LNG gas supply mode. If the system is in the BOG management state and the pressure of the LNG storage tank is lower than 2 barg, the system automatically exits the BOG management state and switches to the LNG gas supply mode.

[0054] When the BOG gas supply module 4 is in the BOG management state and the pressure of the LNG storage tank is higher than 7 barg, and there is no operator confirmation within 30 seconds, it automatically switches to the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode; and when it is currently in the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode, and the current tank pressure is lower than 5.5 barg, it automatically exits the BOG management state and switches to the LNG gas supply mode.

[0055] In the embodiment, in the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode, the gas supply to the gas module 5 can be completed by relying on the pressure of the LNG storage tank itself and the BOG heat exchanger in conjunction with relevant remote control valve instruments.

[0056] In the embodiment, when the auxiliary generator enters the BOG gas supply mode, that is, when the auxiliary generator enters the BOG gas supply mode, the gas phase valve of the fuel tank, the inlet and outlet valves of the BOG heater and the auxiliary generator BOG main valve are opened, and the BOG auxiliary generator gas supply main valve is closed after 5 seconds; when exiting the BOG gas supply mode and entering the LNG supply mode, the auxiliary generator LNG main valve is opened, and the BOG auxiliary generator gas supply main valve is closed after 5 seconds;

[0057] When the hot water heater enters the BOG gas supply mode, that is, the hot water heater BOG mode, open the gas phase valve of the fuel tank, the inlet and outlet valves of the BOG hot water heater and the BOG main valve of the hot water heater, and close the LNG main valve of the hot water heater after 5 seconds; when exiting the BOG gas supply mode and entering the LNG supply mode, open the LNG main valve of the hot water heater, and close the BOG main valve of the hot water heater after 5 seconds.

[0058] The gas consumption module 5 is used for consuming gas, wherein the gas consumption equipment includes an auxiliary generator and a hot water heater.

[0059] In the embodiment, after the main gas supply valve is closed, the gas supply stop procedure is performed, and in sequence, the user ventilation valve V02 is opened, the gas pipeline is automatically purged, the fuel pump is turned off, the LNG vaporizer inlet valve is closed, the pump outlet valve and the reflux valve are closed, and the water glycol system is closed.

[0060] 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 above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A new type of FGSS control system for trailing suction hopper dredger, characterized in that: include: The control and monitoring module is equipped with instrumentation equipment, which is used to read the important parameters of the entire gas combustion locally or remotely; to operate each device to issue opening and closing commands; and to alarm when the remote control valve fails to open or close or the instrument value fails; Safety module for automatically shutting down the gas fuel supply system in the event of a fault or other failure that develops too quickly for human intervention; LNG gas supply module, used to execute the commands of the control monitoring module and the safety module, and gasify LNG and deliver it to the gas using module at a constant pressure and temperature; BOG gas supply module, used to execute the commands of the control monitoring module and the safety module, and deliver BOG to the gas using module at a constant pressure and temperature; The gas consumption module is used to consume gas, wherein the gas consumption equipment includes an auxiliary generator and a hot water heater.

2. A novel FGSS control system for a trailing suction hopper dredger according to claim 1, characterized in that: The control monitoring module issues opening and closing commands for various devices; the various devices include but are not limited to remote control valves, LNG pumps, water glycol pumps and fans, and the devices that issue opening and closing commands for various devices include but are not limited to buttons; The control monitoring module performs an alarm operation when there is a failure in opening or closing of the remote control valve or an error in the instrument value; The alarm operation in the control monitoring module adopts Siemens redundant PLC, and the CPU is redundant in the PROFINET ring network. Two identical CPUs are synchronized through redundant connections.

3. A novel FGSS control system for a trailing suction hopper dredger according to claim 1, characterized in that: The safety module adopts Siemens redundant PLC, and the CPU is redundant in the PROFINET ring network, and two identical CPUs are synchronized through redundant connections.

4. A novel FGSS control system for a trailing suction hopper dredger according to claim 1, characterized in that: The LNG gas supply module receives the opening or closing command from the control and monitoring module, and opens or closes the fan and the nitrogen system; The LNG gas supply module determines whether the state of the blower is on. If it is on and the nitrogen pressure is normally greater than 4.1 Bar, it returns a signal to the control monitoring module and issues a command to start the water glycol system. The LNG gas supply module receives the opening or closing command from the control and monitoring module to open or close the water glycol system; The LNG gas supply module determines whether the water glycol temperature in the water glycol system is greater than 40° C., and reminds the staff to open the reflux valve, and the reflux valve opening is greater than 40%; The LNG gas supply module determines whether the reflux valve is open and whether the reflux valve opening is greater than 40%. If so, the pump outlet valve and the LNG pump are automatically opened; The LNG gas supply module determines whether the pressure difference at the pump outlet valve is greater than 0.5 Bar, and if so, automatically opens the vaporizer LNG inlet valve; The LNG gas supply module determines whether the buffer tank pressure is greater than 6.5 Bar. If so, it sends a gas ready signal to the control monitoring module, and is in the LNG gas supply mode to supply gas to the gas using module.

5. A novel FGSS control system for a trailing suction hopper dredger according to claim 4, characterized in that: In the LNG gas supply module, in the LNG gas supply mode, the LNG pump, the LNG storage tank, the LNG heat exchanger cooperate with the relevant remote control valve instruments to complete the gas supply to the gas consumption module.

6. A novel FGSS control system for a trailing suction hopper dredger according to claim 4, characterized in that: In the LNG gas supply module, if the remote control valve fails to open or close or the instrument value fails, the LNG supply will be stopped and the operation will be restarted after the corresponding fault processing.

7. A novel FGSS control system for a trailing suction hopper dredger according to claim 4, characterized in that: The BOG gas supply module determines the current LNG storage tank pressure value when in the LNG gas supply mode; When the pressure of the LNG storage tank is higher than 3 barg, the BOG gas supply module will pop up a BOG management mode reminder, enter the BOG management state, and manually select to enter the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode; The BOG gas supply module is in the BOG management state, when the LNG storage tank pressure is higher than 7 barg, and there is no operator confirmation within 30 seconds, it automatically switches to the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode; and is used to automatically exit the BOG management state and switch to the LNG gas supply mode when it is currently in the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode and the current tank pressure is lower than 5.5 barg.

8. A novel FGSS control system for a trailing suction hopper dredger according to claim 7, characterized in that: In the BOG gas supply module, when the pressure of the LNG storage tank is higher than 3 barg, a BOG management mode reminder pops up and the module enters the BOG management state. If the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode is not manually selected, the module remains in the LNG gas supply mode. If the module is in the BOG management state and the pressure of the LNG storage tank is lower than 2 barg, the module automatically exits the BOG management state and switches to the LNG gas supply mode.

9. A novel FGSS control system for a trailing suction hopper dredger according to claim 7, characterized in that: In the BOG gas supply module, in the auxiliary generator BOG gas supply mode or the hot water heater BOG gas supply mode, the gas supply to the gas-using module can be completed by relying on the pressure of the LNG storage tank itself and the BOG heat exchanger in conjunction with relevant remote control valve instruments.

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