Method for detecting ventilation safety of dangerous area picture of methanol dual-fuel container ship

Abstract

The invention discloses a method for detecting ventilation safety of a methanol dual-fuel container ship dangerous area picture, and relates to the technical field of ship safety monitoring, and the method comprises the following steps: installing a differential pressure gauge in a fuel cabin connecting chamber and an air lock chamber respectively, and connecting two pipelines of the differential pressure gauges to the fuel cabin connecting chamber and the air lock chamber respectively; if the fan in the fuel cabin connecting chamber operates normally and the differential pressure signal of the differential pressure gauge is within a preset range, judging that the fuel cabin connecting chamber is in a'safe ventilation state '; and if the fan in the fuel cabin connecting chamber operates normally, but the differential pressure signal of the differential pressure gauge is smaller than a preset range, judging that the differential pressure gauge fails or the fuel cabin connecting chamber is in an unsafe ventilation state. By simultaneously monitoring the running state of the fan and the differential pressure signal of the differential pressure gauge, the effect of quickly checking whether the fuel cabin connecting chamber and the air lock chamber are in the ventilation safety state or not is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ship safety monitoring, and in particular to a method for detecting ventilation safety of dangerous areas of a methanol dual-fuel container ship. Background Art

[0002] Methanol is a new type of clean fuel that has been increasingly used as ship fuel in recent years. Methanol is lighter than water, soluble in water, highly volatile, colorless, flammable, and has a smell very similar to ethanol (drinking alcohol). However, methanol is different from ethanol and is highly toxic. If a certain amount of methanol is accidentally inhaled, it will cause damage to the human central nervous system, eye damage, and metabolic acidosis. Therefore, good ventilation should always be maintained in the methanol fuel storage area and its adjacent areas. Once the ventilation fails, it needs to be quickly identified and an alarm should be issued to alert the crew.

[0003] According to the definition of dangerous zones in IEC60079-15 standard, the methanol fuel tank is a dangerous zone (ZONE 0) and cannot be directly connected to the ship's open deck (safety zone). Figure 1 As shown in the figure, two airtight compartments need to be set up, namely TANK CONNECTION SPACE (fuel tank connection room, ZONE 1 level) and TCS AIR LOCK SPACE (ZONE 2 level), referred to as TCS and airlock respectively; ZONE 0 indicates the place where explosive gas environment appears continuously and exists for a long time, ZONE 1 indicates the place where explosive gas environment may appear during normal operation, and ZONE 2 indicates the place where explosive gas environment is unlikely to appear during normal operation, and if it appears, it will only happen occasionally and exist only for a short time; negative pressure is always maintained between ZONE 1 and ZONE 2, so that after setting up TCS and airlock, methanol gas can be prevented from escaping and spreading outward.

[0004] To ensure the stability and reliability of the ventilation system, two fans are usually installed in the TCS and airlock of methanol dual-fuel container ships, one for use and one for backup. The fan type in the TCS is an exhaust fan, and the fan type in the airlock is a supply fan; but it is impossible to accurately determine whether the TCS and airlock are in a "safe ventilation" state by simply detecting the operating status of the fan. If the air duct is blocked or the air tightness of the room is lost, it may cause the overflow of methanol gas. Due to the toxicity of methanol, once a large-scale leak occurs, it will cause a serious safety accident. Summary of the invention

[0005] The purpose of the present invention is to provide a method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships, which can quickly check whether TCS and airlock chamber are in a ventilation safety state by simultaneously monitoring the operating state of the fan and the differential pressure signal of the differential pressure gauge.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: A method for detecting ventilation safety of dangerous areas of a methanol dual-fuel container ship comprises the following steps: installing a differential pressure gauge in a fuel tank connection room and an airlock room, respectively, and two pipes of the differential pressure gauge are connected to the fuel tank connection room and the airlock room respectively; If the fan in the fuel tank connection room operates normally and the differential pressure signal of the differential pressure gauge is within the preset range, the fuel tank connection room is judged to be in a "safe ventilation state"; If the fan in the fuel tank connecting room operates normally, but the differential pressure signal of the differential pressure gauge is less than the preset range, it is judged that the differential pressure gauge is faulty or the fuel tank connecting room is in an "unsafe ventilation state".

[0007] Furthermore, the preset range of the differential pressure signal of the differential pressure gauge is greater than 50Pa.

[0008] Furthermore, the method for determining whether the fan is operating normally includes the following steps: When the fan motor is running, the corresponding motor starter sends an operation signal to the ship's engine room monitoring and alarm system. After receiving the signal, the monitoring and alarm system determines that the corresponding fan is operating normally. When the fan motor is manually stopped, the corresponding fan motor starter sends a stop signal to the ship's engine room monitoring alarm system. After receiving the signal, the monitoring alarm system determines that the corresponding fan is stopped normally. If the monitoring and alarm system receives neither an operating signal nor a stop signal from the corresponding fan, the monitoring and alarm system determines that the corresponding fan has stopped abnormally.

[0009] Furthermore, there are two fans in the fuel compartment connecting room and the airlock room respectively. When one fan is determined to have stopped abnormally, the other fan will start operating immediately.

[0010] Furthermore, after one fan stops abnormally, the other fan starts immediately. If the pressure difference signal of the differential pressure gauge is within a preset range, the monitoring alarm system prompts that the corresponding fan is faulty.

[0011] Furthermore, after one fan stops abnormally, the other fan starts immediately. If the pressure difference signal of the differential pressure gauge is less than the preset range, the monitoring alarm system determines that the differential pressure gauge is faulty or the fuel tank connecting room is in an "unsafe ventilation state".

[0012] Furthermore, after one fan stopped abnormally, the other fan started immediately, but then also stopped abnormally. The monitoring alarm system prompted that the corresponding two fans were faulty and the fuel tank connecting room was in an "unsafe ventilation state".

[0013] Furthermore, the differential pressure gauge includes a self-checking module, which identifies whether the differential pressure gauge itself has a fault and sends a fault signal to a monitoring alarm system.

[0014] Furthermore, when the fan in the fuel tank connecting room operates normally, but the pressure difference signal of the differential pressure gauge is less than the preset range, if the differential pressure gauge sends a fault signal, the monitoring alarm system prompts that the differential pressure gauge is faulty, otherwise it prompts that the fuel tank connecting room is in an "unsafe ventilation state".

[0015] In summary, the present invention has the following beneficial effects: A differential pressure gauge is added to the TCS and the airlock room respectively. By simultaneously monitoring the operating status of the fan and the differential pressure signal of the differential pressure gauge, a comprehensive judgment is made as to whether the danger zone is in a safe ventilation state, thereby improving the accuracy of the judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the definition of the danger zone drawing in the background technology of the present invention; Figure 2 It is a schematic diagram of the distribution of differential pressure gauges in a method for detecting ventilation safety of dangerous areas of a methanol dual-fuel container ship of the present invention; Figure 3 It is a schematic diagram of the principle of a monitoring and alarm system in a method for detecting ventilation safety of dangerous areas of a methanol dual-fuel container ship of the present invention. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, and this embodiment does not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] A method for detecting ventilation safety in dangerous areas of methanol dual-fuel container ships, such as Figure 2 As shown, the following steps are included: a differential pressure gauge is installed in each of the TCS and the airlock chamber, and two pipes of the two differential pressure gauges are connected to the TCS and the airlock chamber respectively; in this embodiment, the differential pressure gauge has a differential pressure measurement range of 0-500Pa, and the differential pressure gauge sends the differential pressure signal to the monitoring and alarm system in real time. When the differential pressure gauge measures less than 50Pa, the monitoring and alarm system will prompt a low pressure differential alarm, and the differential pressure gauge will trigger the local sound and light alarm device; the differential pressure gauge should include a self-test module for identifying whether it has a fault and sending the fault signal to the monitoring and alarm system for identification.

[0019] like Figure 3As shown, there are two fans in each of the TCS and the airlock room, one is fan No. 1, which is used for normal operation, and the other is fan No. 2, which is used as a backup. When it is determined that fan No. 1 stops abnormally, fan No. 2 starts running immediately.

[0020] The method for determining whether the fan is operating normally includes the following steps: When the fan motor is running, the corresponding motor starter sends a running signal (RUN) to the ship's engine room monitoring and alarm system. After receiving the signal, the monitoring and alarm system determines that the corresponding fan is operating normally. For example, when fan No. 1 is running, the starter of fan No. 1 continuously or periodically sends the NO.1 FAN RUN signal. After receiving the signal, the monitoring and alarm system determines that fan No. 1 is operating normally. When the fan motor is manually stopped, the corresponding fan motor starter sends a stop signal (STOP) to the ship's engine room monitoring alarm system. After receiving the signal, the monitoring alarm system determines that the corresponding fan is stopped normally. If the monitoring alarm system receives neither the running signal nor the stop signal of the corresponding fan, the monitoring alarm system determines that the corresponding fan is abnormally stopped; For example, if the monitoring and alarm system receives neither the RUN signal nor the STOP signal from fan No. 1, the monitoring and alarm system will immediately determine that fan No. 1 has stopped abnormally; the reason for the abnormal stop may be a power failure of the fan motor, or it may be a failure of the motor itself that causes the fan to stop abnormally; once fan No. 1 stops, fan No. 2, as the backup fan of fan No. 1, should be started immediately to maintain normal ventilation in the room. The monitoring and alarm system will determine that fan No. 1 has stopped abnormally and issue an alarm, and the judgment logic for whether fan No. 2 is running normally is the same as described above.

[0021] The specific detection method includes the following steps: 1. If the fan (No. 1 fan) in the TCS operates normally and the differential pressure signal of the differential pressure gauge is within the preset range (the preset range of the differential pressure signal of the differential pressure gauge is 50-500Pa), the TCS is judged to be in a "safe ventilation state"; 2. If the fan (fan No. 1) in the TCS operates normally, but the differential pressure signal of the differential pressure gauge is less than 50Pa, it is judged that the differential pressure gauge is faulty or the TCS is in an "unsafe ventilation state"; 2.1 The cause of the abnormal pressure difference may be due to the failure of the differential pressure gauge itself. If the differential pressure gauge sends a fault signal, the monitoring and alarm system should prompt the differential pressure gauge failure instead of immediately judging that the TCS is in an "unsafe ventilation state".

[0022] 2.2 However, if the differential pressure gauge does not send out an abnormal operation signal, and the fault of the differential pressure gauge itself is ruled out, and it is not caused by a fan failure, then it can only be that the air duct is blocked or the air tightness of the TCS room is lost; at this time, the monitoring alarm system should prompt that the TCS is in an "unsafe ventilation state".

[0023] 3. When fan No. 1 in the TCS stops abnormally, fan No. 2 starts running automatically; If the differential pressure value of the differential pressure gauge is within the preset range of 50-500Pa, it indicates that the TCS is in a safe ventilation state, but the monitoring alarm system should prompt the NO.1 FAN ABNORMAL STOP state, indicating that the corresponding fan is faulty, and the fault of fan No. 1 should be resolved as soon as possible.

[0024] 4. When fan No. 1 in the TCS stops abnormally, fan No. 2 starts running automatically, but the pressure difference value of the differential pressure gauge is less than 50Pa, and the judgment logic of the monitoring alarm system is the same as point 2 above.

[0025] 5. When fan No. 1 in TCS stops abnormally, fan No. 2 starts running automatically, but then fan No. 2 also stops abnormally; at this time, the monitoring alarm system prompts NO.1 FAN ABNORMAL STOP and NO.2 FAN ABNORMAL STOP, and prompts that TCS is in "unsafe ventilation state" (without the signal from the differential pressure gauge).

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships, characterized by: The method comprises the following steps: installing a differential pressure gauge in the fuel tank connection room and the airlock room respectively, wherein two pipes of the differential pressure gauge are connected to the fuel tank connection room and the airlock room respectively; If the fan in the fuel tank connection room operates normally and the differential pressure signal of the differential pressure gauge is within the preset range, the fuel tank connection room is judged to be in a "safe ventilation state"; If the fan in the fuel tank connecting room operates normally, but the differential pressure signal of the differential pressure gauge is less than the preset range, it is judged that the differential pressure gauge is faulty or the fuel tank connecting room is in an "unsafe ventilation state".

2. A method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships according to claim 1, characterized in that: The preset range of the differential pressure signal of the differential pressure gauge is greater than 50Pa.

3. The method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships according to claim 1, characterized in that: The method for judging whether the fan is operating normally includes the following steps: When the fan motor is running, the corresponding motor starter sends an operation signal to the ship's engine room monitoring and alarm system. After receiving the signal, the monitoring and alarm system determines that the corresponding fan is operating normally. When the fan motor is manually stopped, the corresponding fan motor starter sends a stop signal to the ship's engine room monitoring alarm system. After receiving the signal, the monitoring alarm system determines that the corresponding fan is stopped normally. If the monitoring and alarm system receives neither an operating signal nor a stop signal from the corresponding fan, the monitoring and alarm system determines that the corresponding fan has stopped abnormally.

4. A method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships according to claim 1 or 3, characterized in that: There are two fans in the fuel compartment connecting room and the airlock room. When one fan is determined to have stopped abnormally, the other fan will start operating immediately.

5. A method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships according to claim 4, characterized in that: After one fan stops abnormally, the other fan starts immediately. If the pressure difference signal of the differential pressure gauge is within the preset range, the monitoring alarm system prompts that the corresponding fan is faulty.

6. A method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships according to claim 4, characterized in that: After one fan stops abnormally, the other fan starts immediately. If the pressure difference signal of the differential pressure gauge is less than the preset range, the monitoring alarm system determines that the differential pressure gauge is faulty or the fuel tank connecting room is in an "unsafe ventilation state".

7. A method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships according to claim 4, characterized in that: After one fan stopped abnormally, the other fan started immediately, but then it also stopped abnormally. The monitoring alarm system prompted that the two corresponding fans were faulty and the fuel tank connecting room was in an "unsafe ventilation state".

8. The method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships according to claim 1, characterized in that: The differential pressure gauge includes a self-checking module, which identifies whether the differential pressure gauge itself has a fault and sends a fault signal to a monitoring alarm system.

9. A method for detecting ventilation safety of dangerous areas of methanol dual-fuel container ships according to claim 8, characterized in that: The fan in the fuel tank connection room operates normally, but when the differential pressure signal of the differential pressure gauge is less than the preset range, if the differential pressure gauge sends a fault signal, the monitoring alarm system prompts that the differential pressure gauge is faulty, otherwise it prompts that the fuel tank connection room is in an "unsafe ventilation state".

Images