CN-121995817-A - Emergent cutting-off system of LNG ship

CN121995817ACN 121995817 ACN121995817 ACN 121995817ACN-121995817-A

Abstract

An LNG ship emergency cutting-off system can realize on-off control of circuit control signals and power sources through a microcontroller module according to collected current signals and feedback of a central control system and data supply of sensors. The intelligent control system comprises a central control system, a microcontroller module, a cut-off execution module, a current detection module, a temperature sensor, a pressure sensor, a liquid level sensor, an opening quantity module, an alarm indication module and a human-computer interaction interface. The emergency cutting-off device with double redundancy ensures the stability and reliability of the emergency cutting-off function. When the cut-off function is triggered, both sets of cut-off devices act simultaneously. When one set of cutting device fails and the cutting function cannot be realized, the cutting function of the whole loop can be realized through the other set of cutting device. According to the requirements of important systems such as an LNG ship liquid cargo control system and the like on emergency cutting-off of a power supply and a control loop, the loop for realizing the emergency cutting-off function is required to be ensured to be always in a safe and reliable state.

Inventors

GUO HUI
WANG BO
ZENG XIANPING
LIU YUEQIANG
WANG SHUPENG
WANG YANLONG
GAO YANFANG
QIN JUNJIE
HOU YUYI
LI BINGTAO

Assignees

大连船舶重工集团有限公司

Dates

Publication Date: 20260508
Application Date: 20251212

Claims (6)

1. The LNG ship emergency cutting-off system is characterized in that a central control system is connected with a microcontroller module, the microcontroller module is used for receiving control instructions from the central control system, executing commands together with corresponding actuators directly lowered by the central control system, and receiving data information from a sensor; the cut-off execution module receives signals from the current detection module, the microcontroller module and the central control system to control the on-off of a loop where the cut-off execution module is located, the cut-off execution module is provided with two sets of cut-off devices, the two sets of cut-off devices are connected in series, each set of cut-off devices respectively receives cut-off signals from independent signal sources, and when any cut-off device receives an emergency cut-off signal, a cut-off instruction is executed; The current detection module detects the current in the loop and transmits the current value to the microcontroller module in real time, the microcontroller module judges whether the current value is larger than a given threshold value, if so, a cutting-off signal is sent to the cutting-off execution module to execute the power cutting-off of the loop, and meanwhile, the signal is output to the alarm indication module and the man-machine interaction interface module; when the current detection module detects a short circuit, a cutting-off signal is directly sent to the cutting-off execution module to execute cutting-off action, and the information is fed back to the microcontroller module; The switching-in amount module receives switching-in amount signals from the outside, and the microcontroller module is used for sending a cutting-off signal to the cutting-off execution module to cut off a loop where the switching-in amount signals are cut off; the alarm indication module receives alarm triggering information from the microcontroller module and feeds back alarm types through different colors and sounds; the man-machine interaction interface module is connected with the microcontroller module, and receives various data signals provided by the microcontroller module and also receives a cutting instruction provided by the microcontroller module.
2. An LNG ship emergency shut-off system according to claim 1, wherein the two sets of shut-off device are installed at positions remote from each other when the electromagnetic environment in which the emergency shut-off device is installed is complex and severe.
3. An LNG ship emergency shut-off system according to claim 1, wherein the sensor module comprises a temperature sensor, a pressure sensor, a liquid level sensor; The temperature sensor monitors the line temperature, the temperature in the cabin and the temperature outside the cabin, temperature data are transmitted to the microcontroller module in real time, the microcontroller module compares the temperature data with a set temperature threshold value, and if the temperature data are larger than the set temperature threshold value, a cutting-off signal is sent to the cutting-off execution module and is fed back to the alarm indication module and the man-machine interaction interface module; Meanwhile, the microcontroller module is also involved in calculating the heating rate, and if the line heating rate reaches a set threshold value, the microcontroller module also sends a cutting-off signal to the cutting-off execution module and feeds back a signal to the alarm indication module and the man-machine interaction interface module; The pressure sensor monitors the pressure of the warehouse and feeds the pressure back to the microcontroller module, and when the pressure of the warehouse is overlarge, the microcontroller module transmits the signal to the central control system to make a decision; The liquid level sensor is used for monitoring the liquid level of the cargo house LNG, when the liquid level reaches a certain level, the microcontroller module can feed back the information to the central control system, and the central control system can receive liquid level data transmitted by the liquid level sensor of the system and liquid level data fed back by the microcontroller module at the same time, so that a user is reminded of timely paying attention to the liquid level condition.
4. The LNG ship emergency shut-off system of claim 1, wherein the man-machine interface module receives data signals from the microcontroller module including current signals, temperature signals, pressure signals, and liquid level signals.
5. The LNG ship emergency shut-off system of claim 1, wherein the man-machine interface module receives the shut-off command from the microcontroller module, and displays the time of occurrence, the location and the reason for making the shut-off judgment, and the user can check the trouble according to the displayed location for maintenance.
6. An LNG ship emergency shut-off system according to claim 1, characterized in that the threshold value for the line heating rate setting of the microcontroller module is 2 ℃/s.

Description

Emergent cutting-off system of LNG ship Technical Field The invention belongs to the field of marine ship construction and design, and particularly relates to an LNG ship emergency cutting-off system. Background When the working state of the liquid cargo control equipment or the flow control link of the LNG ship is abnormal, the power supply of related equipment and systems and related control signals are required to be cut off so as to ensure the safety and reliability of the liquid cargo operation and the flow control system of the LNG ship. In order to ensure long-term and stable operation of an automatic system, control components with higher safety are often adopted in an emergency cutting-off system, so that failure of the emergency cutting-off system caused by component faults is avoided. Even components with higher reliability may be abnormal in operation due to their own or the surrounding environment. The power or signal that should be cut off is not cut off in time, which is likely to have serious adverse effects and even cause safety accidents. Disclosure of Invention In order to solve the problems, the invention provides an LNG ship emergency cutting-off system, which aims to meet the requirements of important systems such as an LNG ship liquid cargo control system and the like on emergency cutting-off of a power supply and a control loop, and ensure that the loop for realizing the emergency cutting-off function is always in a safe and reliable state, and adopts the following technical scheme: the utility model provides an emergent cutting off system of LNG ship, central control system is connected with microcontroller module, and microcontroller module is used for receiving the control command from central control system, carries out the command with the corresponding executor that central control system directly descends, and microcontroller module still receives the data information from the sensor simultaneously. The cut-off execution module receives signals from the current detection module, the microcontroller module and the central control system to control the on-off of a loop where the cut-off execution module is located, the cut-off execution module is provided with two sets of cut-off devices, the two sets of cut-off devices are connected in series, each set of cut-off device receives cut-off signals from independent signal sources respectively, and when any cut-off device receives an emergency cut-off signal, a cut-off instruction is executed. The current detection module detects the current in the loop and transmits the current value to the microcontroller module in real time, the microcontroller module judges whether the current value is larger than a given threshold value, if so, the microcontroller module sends a cutting-off signal to the cutting-off execution module to execute the power cutting-off of the loop where the cutting-off execution module is located, and meanwhile, the signal is output to the alarm indication module and the man-machine interaction interface module. When the current detection module detects a short circuit, a cutting-off signal is directly sent to the cutting-off execution module to execute cutting-off action, and the information is fed back to the microcontroller module. The switching-in amount module receives switching-in amount signals from the outside, and the microcontroller module is used for sending a cutting-off signal to the cutting-off execution module to cut off a loop where the switching-in amount signals are cut off. The alarm indication module receives alarm triggering information from the microcontroller module and feeds back alarm types through different colors and sounds. The man-machine interaction interface module is connected with the microcontroller module, and receives various data signals provided by the microcontroller module and also receives a cutting instruction provided by the microcontroller module. According to the LNG ship emergency cutting system, even further, when the electromagnetic environment for installing the emergency cutting device is complex and severe, the installation positions of the two sets of cutting devices are far away from each other. The LNG ship emergency cutting system further comprises a sensor module, a temperature sensor, a pressure sensor and a liquid level sensor. The temperature sensor monitors the line temperature, the temperature in the cabin and the temperature outside the cabin, temperature data are transmitted to the microcontroller module in real time, the microcontroller module compares the temperature data with a set temperature threshold value, and if the temperature data are larger than the set temperature threshold value, a cutting-off signal is sent to the cutting-off execution module and fed back to the alarm indication module and the man-machine interaction interface module. And meanwhile, the microcontroller module also participates in calculating the heating rate, and if the li