All fresh air ventilation system of methanol dual-fuel container ship air conditioner and control method
By adopting a dual-unit design with side-controlled and a methanol steam concentration detection system on a methanol dual-fuel container ship, automatic switching of ventilation mode is achieved, which solves the problem that traditional ventilation systems are difficult to prevent methanol steam from diffusion, and significantly improves the reliability and emergency response capabilities of the ventilation system.
Patent Information
- Application Number
- CN202510626049.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-15
- Publication Date
- 2025-06-20
AI Technical Summary
Under high-risk conditions such as filling and leakage, traditional ventilation systems are difficult to effectively prevent the spread of methanol steam, which poses a risk of explosion and personnel poisoning. At the same time, blindly closing the ventilation system in the superstructure may cause overheating and failure of electrical equipment in the superstructure, threatening the safety of ship navigation.
The dual-unit design with side control, double-sided methanol steam concentration detection, and wind gate linkage control are adopted to realize automatic switching of ventilation mode, quickly and actively block the inhalation of methanol steam, and ensure the ventilation safety of the superstructure.
It effectively reduces the risk of steam entering residential areas under methanol filling or leakage conditions, improves response speed, avoids the risk of overheating and shutdown of electrical equipment caused by ventilation interruptions in traditional solutions, and significantly improves the reliability and emergency response capabilities of the ventilation system of the superstructure of dual-fuel ships.
Smart Images
Figure CN120171745A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of ship ventilation systems, and particularly to a fresh air ventilation system and control method for the air conditioners of methanol dual-fuel container ships. Background Art
[0002] With the global attention to environmental issues, more and more large clean energy ships have emerged in the international ship market. As a low-carbon and low-pollution alternative fuel, methanol has been rapidly popularized in the application of container ships. However, due to the low flash point and high volatility of methanol fuel, combustible vapor accumulation is likely to occur during the refueling and storage processes. Especially in the scenario where refueling stations are arranged on both sides of the ship's superstructure, the traditional ventilation system faces challenges. During refueling operations, external methanol vapor may invade the living area through the fresh air ducts of the air conditioners, posing risks of explosion and personnel poisoning. In addition, in the emergency condition of leakage, blindly closing the ventilation system may cause overheating and failure of the electrical equipment in the superstructure, threatening the navigation safety of the ship.
[0003] Therefore, a control method for the air conditioning ventilation system of methanol dual-fuel container ships is needed to ensure the rapid blocking of methanol leakage, maintain the heat dissipation efficiency of equipment under emergency conditions, and achieve coordinated cooperation with methanol fuel refueling operations. Summary of the Invention
[0004] The purpose of the present invention is to provide a fresh air ventilation system for the air conditioners of methanol dual-fuel container ships. Aiming at the diffusion risk of toxic vapor under high-risk conditions such as refueling and leakage of methanol dual-fuel powered ships, through the dual-unit design with side-by-side control, the detection of methanol vapor concentration on both sides, and the linkage control of air dampers, the automatic switching of the ventilation mode is realized, and the rapid and active blocking of methanol vapor inhalation is achieved to ensure the ventilation safety of the superstructure.
[0005] The above technical purpose of the present invention is achieved through the following technical solutions: A fresh air ventilation system for the air conditioners of methanol dual-fuel container ships includes at least two air conditioning fan units. Both air conditioning fan units include a supply air fan and an exhaust air fan for supplying air and exhausting air to the ship's superstructure. The supply air fan is connected to the fresh air duct of the air conditioner. The outer end of the fresh air duct of the air conditioner is connected to the fresh air inlet of the air conditioner. The exhaust air fan is connected to the exhaust air duct of the air conditioner. The outer end of the exhaust air duct of the air conditioner is connected to the exhaust air outlet of the air conditioner. And the two groups of fresh air inlets and exhaust air outlets of the air conditioner are respectively located on both sides of the superstructure. Check valves are provided in both the fresh air duct and the exhaust air duct of the air conditioner. Methanol vapor concentration probes are provided in the fresh air inlet and / or the exhaust air outlet of the air conditioner. When the concentration is higher than the set value, the ventilation system mode is switched.
[0006] Furthermore, the ventilation system mode includes the opposite-side air conditioning ventilation system mode. When the methanol vapor concentration probe at the air-conditioning fresh air inlet or air-conditioning exhaust outlet on any side detects that the methanol vapor concentration is higher than the set value, the air-conditioning ventilation system mode on the opposite side is entered, the power of the air-conditioning fan unit on the same side is turned off, and the reverse air damper of the air-conditioning fresh air duct and the air-conditioning exhaust duct is closed in conjunction; the air-conditioning fan unit and reverse air damper on the opposite side are started synchronously.
[0007] Furthermore, the ventilation system mode includes a conventional fresh air ventilation system mode. In the conventional fresh air ventilation system mode, single-sided or double-sided air-conditioning fan units are operated, and the corresponding check dampers of the air-conditioning fresh air duct and the air-conditioning exhaust duct are opened.
[0008] Furthermore, it also includes two internal circulation dampers, one end of the internal circulation damper is connected to the corresponding air conditioning fresh air duct, and the other end is connected to the corresponding air conditioning exhaust duct.
[0009] Furthermore, the ventilation system mode includes a global emergency internal circulation ventilation system mode. When the methanol vapor concentration probes on both sides detect that the methanol vapor concentration is higher than the set value, close the check dampers of all air-conditioning fresh air ducts and air-conditioning exhaust ducts, open the internal circulation damper on at least one side, and start the supply air fan and / or exhaust fan on the corresponding side.
[0010] Furthermore, the air supply fan is also connected to the superstructure air supply duct, the exhaust fan is also connected to the superstructure return air duct, and the superstructure air supply duct and the superstructure return air duct are both connected to the superstructure of the ship.
[0011] Furthermore, both air-conditioning fan units include energy recovery devices to recover the energy of exhaust air between the air-conditioning fresh air duct and the air-conditioning exhaust duct.
[0012] Furthermore, two sets of air-conditioning fresh air vents and air-conditioning exhaust vents are located on both sides, and maintain a safe distance from the corresponding methanol filling stations.
[0013] The present invention also discloses a control method for a methanol dual-fuel container ship air conditioning fresh air ventilation system, comprising the following steps: During normal navigation, the ship enters the normal fresh air ventilation system mode, with the air conditioning fan units on one or both sides running, the corresponding check dampers of the fresh air duct and the exhaust duct being in the open state, and the corresponding internal circulation dampers being in the closed state, to ensure normal fresh air ventilation of the superstructure; When the methanol vapor concentration probe at the air-conditioning fresh air inlet or air-conditioning exhaust outlet on any side detects that the methanol vapor concentration is higher than the set value, the air-conditioning ventilation system mode on the opposite side is entered, and the power of the air-conditioning fan unit on the same side is automatically shut down immediately, and the reverse air damper of the air-conditioning fresh air duct and the air-conditioning exhaust duct is closed in conjunction to achieve physical isolation of the leakage side; the air-conditioning fan unit and reverse air damper on the opposite side are started synchronously to maintain the ventilation needs of the superstructure.
[0014] Furthermore, before the filling operation is performed at the methanol filling station on either side of the superstructure, the ventilation system mode is set to the air-conditioning ventilation system mode on the opposite side.
[0015] In summary, the present invention has the following beneficial effects: In view of the risk of flammable vapor intrusion caused by the methanol filling stations on both sides of the superstructure, the methanol vapor concentration data is monitored in real time. Through the dual-unit design with side-by-side control and automatic switching of three-level ventilation modes (conventional fresh air mode, opposite-side ventilation mode, emergency internal circulation mode), the risk of vapor intrusion into residential areas under methanol filling or leakage conditions is reduced, and the response speed is improved. At the same time, in the internal circulation mode, the ventilation of the superstructure is guaranteed to avoid the risk of overheating and shutdown of electrical equipment due to ventilation interruption in traditional solutions. It has both active safety protection and energy efficiency optimization functions, which significantly improves the reliability and emergency response capability of the ventilation system of the superstructure of dual-fuel ships. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The present invention is a structural schematic diagram of a methanol dual-fuel container ship air-conditioning fresh air ventilation system.
[0017] In the figure, 1. air conditioning fan unit; 2. air conditioning fresh air duct; 3. air conditioning exhaust duct; 4. air conditioning fresh air outlet; 5. air conditioning exhaust outlet; 6. methanol vapor concentration probe; 7. check damper; 8. internal circulation damper; 9. superstructure supply air duct; 10. superstructure return air duct; 11. supply air fan; 12. exhaust fan; 13. energy recovery device. DETAILED DESCRIPTION
[0018] 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.
[0019] A methanol dual-fuel container ship air conditioning fresh air ventilation system, such as Figure 1 As shown, it includes two air conditioning fan units 1, both located in the air conditioning equipment room, and the two air conditioning fan units 1 include an air supply fan 11 and an exhaust fan 12, which are used for air supply and exhaust of the ship's superstructure; The air supply fan 11 is connected to the air conditioning fresh air duct 2, the outer end of the air conditioning fresh air duct 2 is connected to the air conditioning fresh air outlet 4, the exhaust fan 12 is connected to the air conditioning exhaust duct 3, the outer end of the air conditioning exhaust duct 3 is connected to the air conditioning exhaust outlet 5, and the two groups of air conditioning fresh air outlets 4 and air conditioning exhaust outlets 5 are respectively located on both sides of the superstructure (in this embodiment, the air conditioning fresh air outlet 4 is located on the upper floor, and the air conditioning exhaust outlet 5 is located on the lower floor), and the air conditioning fresh air duct 2 and the air conditioning exhaust duct 3 are both provided with electric check dampers 7; In the present embodiment, the inner ends of the two air-conditioning fresh air ducts 2 are connected to the superstructure air supply duct 9, the inner ends of the two air-conditioning exhaust ducts 3 are connected to the superstructure return air duct 10, and the other ends of the superstructure supply air duct 9 and the superstructure return air duct 10 are connected to the superstructure of the ship (living cabin and control station); in other embodiments, the two air-conditioning fan units 1 include energy recovery devices 13, which physically isolate the mixing of air-conditioning fresh air / exhaust air, and at the same time recover the energy of the exhaust air between the air-conditioning fresh air duct 2 and the air-conditioning exhaust duct 3.
[0020] like Figure 1 As shown, the ventilation system also includes two electric internal circulation dampers 8, one end of the electric internal circulation damper 8 is connected to the air conditioning fresh air duct 2 on the corresponding side, and the other end is connected to the air conditioning exhaust duct 3 on the corresponding side; in this embodiment, there are methanol filling stations on both sides of the ventilation system, and the two groups of air conditioning fresh air outlets 4 and air conditioning exhaust outlets 5 are kept at a safe distance from the methanol filling stations on the corresponding sides; the air conditioning fresh air outlets 4 and the air conditioning exhaust outlets 5 are provided with explosion-proof methanol vapor concentration probes 6 to monitor the methanol vapor concentration at the fresh air outlets and the exhaust outlets. When the concentration is higher than the set value, the signal is sent to the air conditioning control system to switch the ventilation system mode; The ventilation system modes include conventional fresh air ventilation system mode, opposite-side air-conditioning ventilation system mode and full-area emergency internal circulation ventilation system mode. In the conventional fresh air mode, single-side unit operation ensures normal ventilation; in the opposite-side ventilation mode, the leakage side or the methanol filling side is isolated and the opposite-side unit is enabled to maintain ventilation; in the full-area emergency internal circulation mode, external pollution sources are cut off and a closed circulation airflow is constructed to ensure equipment heat dissipation.
[0021] In the conventional fresh air ventilation system mode, the single-side or double-side air conditioning fan unit 1 is running, and the corresponding electric check damper 7 of the air conditioning fresh air duct 2 and the air conditioning exhaust duct 3 is opened; When the methanol vapor concentration probe 6 at the air-conditioning fresh air outlet 4 or the air-conditioning exhaust outlet 5 on any side detects that the methanol vapor concentration is higher than the set value, the air-conditioning ventilation system mode on the opposite side is entered, the power supply of the air-conditioning fan unit 1 on the same side is turned off, and the electric reverse damper 7 of the air-conditioning fresh air duct 2 and the air-conditioning exhaust duct 3 are closed in conjunction; the air-conditioning fan unit 1 and the electric reverse damper 7 on the opposite side are started synchronously.
[0022] When the methanol vapor concentration probes 6 on both sides detect that the methanol vapor concentration is higher than the set value, the full-area emergency internal circulation ventilation system mode is entered, the electric check dampers 7 of all air-conditioning fresh air ducts 2 and air-conditioning exhaust ducts 3 are closed, the electric internal circulation damper 8 on one side is opened, and the supply air fan 11 and exhaust air fan 12 on the corresponding side are turned on.
[0023] The present invention also discloses a control method for a methanol dual-fuel container ship air conditioning fresh air ventilation system, comprising the following steps of performing hierarchical control: During normal navigation, the ship enters the normal fresh air ventilation system mode, the air conditioning fan unit 1 on one side is running, the electric check damper 7 of the corresponding (same side) air conditioning fresh air duct 2 and air conditioning exhaust duct 3 is in the open state, and the corresponding (same side) electric internal circulation damper 8 is in the closed state, to ensure normal fresh air ventilation of the superstructure; When the methanol vapor concentration probe 6 at the air-conditioning fresh air outlet 4 or the air-conditioning exhaust outlet 5 on any side detects that the methanol vapor concentration is higher than the set value, the air-conditioning ventilation system mode on the opposite side is entered: the interlocking control is triggered, and the power supply of the air-conditioning fan unit 1 on the same side is automatically shut down immediately, and the electric check damper 7 of the air-conditioning fresh air duct 2 and the air-conditioning exhaust duct 3 is closed in conjunction, so as to achieve physical isolation of the leakage side and prevent methanol vapor from entering the superstructure; the air-conditioning fan unit 1 and the electric check damper 7 on the opposite side are started synchronously to maintain the ventilation demand of the superstructure; Before the methanol filling station on either side of the superstructure is used for filling, the ventilation system mode can also be manually set to the air conditioning ventilation system mode on the opposite side; When the methanol vapor concentration probes 6 on both sides detect that the methanol vapor concentration is higher than the set value, the full-area emergency internal circulation ventilation system mode is entered: the electric check dampers 7 of all air-conditioning fresh air ducts 2 and air-conditioning exhaust ducts 3 are automatically closed to cut off the input of external pollution sources, and the electric internal circulation damper 8 on one side is opened to build a closed circulation airflow through the supply fan 11 and the exhaust fan 12 to ensure the safety of the superstructure ventilation system and the heat dissipation efficiency of the electrical equipment in the control station.
[0024] 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 methanol dual-fuel container ship air conditioning fresh air ventilation system, characterized in that: It includes at least two air-conditioning fan units, each of which includes an air supply fan and an exhaust fan for supplying and exhausting air to the ship's superstructure; The air supply fan is connected to the air-conditioning fresh air duct, the outer end of the air-conditioning fresh air duct is connected to the air-conditioning fresh air outlet, the exhaust fan is connected to the air-conditioning exhaust duct, the outer end of the air-conditioning exhaust duct is connected to the air-conditioning exhaust outlet, and the two groups of air-conditioning fresh air outlets and air-conditioning exhaust outlets are respectively located on both sides of the superstructure, and the air-conditioning fresh air duct and the air-conditioning exhaust duct are both provided with a check damper; a methanol vapor concentration probe is provided in the air-conditioning fresh air outlet and / or the air-conditioning exhaust outlet, and when the concentration is higher than the set value, the ventilation system mode is switched.
2. A methanol dual-fuel container ship air conditioning fresh air ventilation system according to claim 1, characterized in that: The ventilation system mode includes the contralateral air conditioning ventilation system mode, When the methanol vapor concentration probe at the air-conditioning fresh air inlet or air-conditioning exhaust outlet on any side detects that the methanol vapor concentration is higher than the set value, the air-conditioning ventilation system mode on the opposite side is entered, the power of the air-conditioning fan unit on the same side is turned off, and the reverse air damper of the air-conditioning fresh air duct and the air-conditioning exhaust duct is closed in conjunction; the air-conditioning fan unit and reverse air damper on the opposite side are started synchronously.
3. A methanol dual-fuel container ship air conditioning fresh air ventilation system according to claim 1 or 2, characterized in that: The ventilation system mode includes a conventional fresh air ventilation system mode. In the conventional fresh air ventilation system mode, single-sided or double-sided air-conditioning fan units are running, and the corresponding check dampers of the air-conditioning fresh air duct and the air-conditioning exhaust duct are opened.
4. A methanol dual-fuel container ship air conditioning fresh air ventilation system according to claim 1 or 2, characterized in that: It also includes two internal circulation dampers, one end of which is connected to the corresponding air conditioning fresh air duct, and the other end is connected to the corresponding air conditioning exhaust duct.
5. A methanol dual-fuel container ship air conditioning fresh air ventilation system according to claim 4, characterized in that: The ventilation system mode includes the global emergency internal circulation ventilation system mode. When the methanol vapor concentration probes on both sides detect that the methanol vapor concentration is higher than the set value, close the check dampers of all air-conditioning fresh air ducts and air-conditioning exhaust ducts, open the internal circulation damper on at least one side, and start the supply air fan and / or exhaust fan on the corresponding side.
6. A methanol dual-fuel container ship air conditioning fresh air ventilation system according to claim 1, characterized in that: The air supply fan is also connected to the superstructure air supply duct, and the exhaust fan is also connected to the superstructure return air duct. The superstructure air supply duct and the superstructure return air duct are both connected to the ship superstructure.
7. A methanol dual-fuel container ship air conditioning fresh air ventilation system according to claim 1, characterized in that: Both air-conditioning fan units include energy recovery devices to recover the energy of exhaust air between the air-conditioning fresh air duct and the air-conditioning exhaust duct.
8. A methanol dual-fuel container ship air conditioning fresh air ventilation system according to claim 1 or 6, characterized in that: Two sets of air-conditioning fresh air vents and exhaust vents are located on both sides and keep a safe distance from the corresponding methanol filling stations.
9. A control method for a methanol dual-fuel container ship air conditioning fresh air ventilation system based on claim 1, characterized in that: The following steps are included: During normal navigation, the ship enters the normal fresh air ventilation system mode, with the air conditioning fan units on one or both sides running, the corresponding check dampers of the fresh air duct and the exhaust duct being in the open state, and the corresponding internal circulation dampers being in the closed state, to ensure normal fresh air ventilation of the superstructure; When the methanol vapor concentration probe at the air-conditioning fresh air inlet or air-conditioning exhaust outlet on any side detects that the methanol vapor concentration is higher than the set value, the air-conditioning ventilation system mode on the opposite side is entered, and the power of the air-conditioning fan unit on the same side is automatically shut down immediately, and the reverse air damper of the air-conditioning fresh air duct and the air-conditioning exhaust duct is closed in conjunction to achieve physical isolation of the leakage side; the air-conditioning fan unit and reverse air damper on the opposite side are started synchronously to maintain the ventilation needs of the superstructure.
10. The control method of a methanol dual-fuel container ship air conditioning fresh air ventilation system according to claim 9, characterized in that: Before carrying out filling operations at the methanol filling station on either side of the superstructure, the ventilation system mode is set to the air-conditioning ventilation system mode on the opposite side.