Energy-saving control method for ultra-large container ship engine room fan

Abstract

The invention discloses an energy-saving control method for an ultra-large container ship engine room fan, and relates to the technical field of ship fan control, which comprises the following steps: monitoring the load condition of a host, the exhaust air temperature of the fan, the temperature values of different areas in an engine room and the pressure difference of air inside and outside the engine room, and adjusting the frequency of the corresponding fan to enable the fan to operate at a proper power point, according to the main engine load condition, the cabin fan frequency is correspondingly controlled according to the preset relation between the fan frequency and the main engine load; correspondingly controlling the frequencies of the fans in the cabin according to the temperature values of the different areas in the cabin, so that the fans run on the corresponding power points respectively; and the cabin fan frequency is controlled by judging whether the pressure difference exceeds a set value or not. It is ensured that the air volume needed in the large container ship cabin is sufficient, the internal environment of the cabin is appropriate, and meanwhile the effect of reducing power consumption of a cabin fan is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship fan control, and in particular to an energy-saving control method for a fan in an engine room of an ultra-large container ship. Background Art

[0002] The ship's engine room fan provides fresh air for the equipment in the engine room, especially the main engine, and is responsible for improving the ambient temperature of the engine room through ventilation. The main engine of a large container ship will emit a large amount of heat and consume a large amount of air during operation, which will affect the ambient temperature and air pressure in the engine room. The temperature and required air volume in different areas of the engine room are also different. In addition, the ventilation volume and heat emitted by the engine room equipment of ultra-large container ships are very large, which places high demands on the working capacity and power consumption of the engine room fan. Although the conventional constant frequency and constant power engine room fan can meet conventional use, it will cause great waste of electricity resources if it runs at full power when the main engine load is small, the cabin temperature is low or the demand for fresh air is low. Summary of the invention

[0003] The purpose of the present invention is to provide an energy-saving control method for a cabin fan of an ultra-large container ship, so as to ensure that the required air volume in the cabin of the large container ship is sufficient, ensure that the internal environment of the cabin is suitable, and at the same time reduce the power consumption of the cabin fan.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: An energy-saving control method for a fan in an engine room of an ultra-large container ship includes monitoring the load of the main engine, the exhaust temperature of the fan and the temperature values ​​of different areas in the engine room, and the air pressure difference inside and outside the engine room, and adjusting the frequency of the corresponding fan to make it operate at the corresponding power point. Among them, the main engine load condition controls the cabin fan frequency accordingly according to the preset relationship between the fan frequency and the main engine load; the corresponding cabin fan frequency is controlled by the temperature values ​​of different areas in the cabin, so that each fan operates at the corresponding power point; the cabin fan frequency is controlled by whether the pressure difference exceeds the set value.

[0005] Furthermore, the preset relationship between the fan frequency and the host load includes, when the host load is greater than or equal to a first percentage, controlling the cabin fan frequency to be a maximum frequency; when the host load is less than the first percentage, controlling the cabin fan frequency to be adjusted according to the linear relationship between the operating frequency range of the cabin fan and the host load.

[0006] Furthermore, during the fan frequency adjustment process, the priority of the fan exhaust temperature and the air pressure difference between the inside and outside of the cabin is higher than the priority of the main engine load condition.

[0007] Furthermore, during the fan frequency adjustment process, the priority of the temperature values ​​of different areas in the cabin is higher than the priority of the host load condition.

[0008] Furthermore, during the fan frequency adjustment process, the fan exhaust temperature, the air pressure difference between the inside and outside of the cabin, and the temperature values ​​of different areas in the cabin have equal priority.

[0009] Furthermore, the temperature values ​​of different areas in the engine room are divided into the temperature of the oil separator room and the temperature of other areas in the engine room. When the fan is operating normally, when it is monitored that the fan exhaust temperature is higher than the first frequency modulation setting value, the frequency of all fans is controlled to increase; when it is monitored that the temperature in other areas of the cabin is higher than the second frequency modulation setting value, the frequency of all fans is controlled to increase; when it is monitored that the temperature in the oil separator room is higher than the third frequency modulation setting value, the frequency of the fans in the relevant areas of the oil separator room is controlled to increase.

[0010] Furthermore, when it is monitored that the temperature in the oil separator room is higher than the first alarm setting value, the fan frequency in the relevant area of ​​the oil separator room is controlled to the highest frequency; when it is monitored that the temperature in other areas of the cabin is higher than the second alarm setting value, the frequency of all fans is controlled to the highest frequency.

[0011] Furthermore, when the pressure difference is lower than the fourth set value, all fan frequencies are controlled to the highest frequency. If the pressure difference is still lower than the fourth set value after 5 minutes, a low pressure alarm is issued. The pressure difference is monitored again after 10 minutes. If the pressure difference is higher than the fourth set value, the fan frequency is adjusted according to the host load at this time.

[0012] Furthermore, when the pressure difference is higher than the fifth set value and lasts for 5 minutes, a high pressure alarm is issued.

[0013] Furthermore, the fan exhaust temperature and the temperature of different areas in the cabin are monitored by temperature sensors, and the air pressure difference between the inside and outside of the cabin is monitored by pressure sensors.

[0014] In summary, the present invention has the following beneficial effects: The present application can timely control the fan power according to the real-time changes of the temperature in the engine room and the internal and external pressure difference, so that the ambient temperature in the engine room is suitable and the internal pressure of the engine room is kept higher than the external pressure by a certain appropriate value; since the heat discharged and the amount of air consumed by different loads of the ship's main engine are also different, the impact on the ambient temperature and air pressure in the engine room is different, and the present application can also timely control the fan power according to the different loads of the main engine; different areas of the ship's engine room are responsible for the air supply by different fans, and the present application also adopts different control strategies according to the temperature of different areas, so that different fans operate at reasonable power points; On the one hand, the engine room variable frequency fan monitors the main engine load and achieves the maximum frequency output when the main engine load is the first percentage or higher. When the main engine load is lower than the first percentage, the fan output adjusts the frequency linearly. In addition, the program will adjust the frequency of the engine room fan in real time through reasonable judgment logic according to the exhaust temperature of the engine room fan, the ambient temperature of different areas in the engine room (such as the oil separator room), the pressure difference between the inside and outside of the engine room, etc., to ensure the normal operation of the engine room equipment of large container ships and the suitability of the internal environment of the engine room, while achieving energy conservation and emission reduction to the greatest extent; On the basis of maintaining the normal use needs of various equipment and personnel in the engine room of ultra-large container ships, by monitoring the main engine load, fan exhaust temperature, the temperature of different areas in the engine room, the air pressure difference between the inside and outside of the engine room and other conditions, supplemented by reasonable control logic, the frequency conversion control of the engine room fan is realized to ensure that the required air volume in the engine room of large container ships is sufficient and the internal environment of the engine room is suitable. At the same time, the power consumption of the engine room fan is reduced, which has the characteristics of precise control, simple process, energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A control program block diagram of an energy-saving control method for a super-large container ship engine room fan according to the present invention; Figure 2 A curve showing the relationship between the frequency of a ship's engine room fan and the load of the main engine in an energy-saving control method for an engine room fan of a super-large container ship according to the present invention; Figure 3 The present invention is a flowchart of the alarm processing of the engine room fan of a super large container ship in the energy-saving control method of the engine room fan of the present invention. DETAILED DESCRIPTION

[0016] 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.

[0017] An energy-saving control method for a super large container ship engine room fan, such as Figure 1As shown, it includes monitoring the load of the main engine, the exhaust temperature of the fan and the temperature values ​​of different areas in the cabin, and the air pressure difference inside and outside the cabin, and adjusting the corresponding fan frequency to make it run at a suitable power point; wherein, the exhaust temperature of the fan and the temperature of different areas in the cabin are monitored by temperature sensors. In this embodiment, the sensor for monitoring the exhaust temperature of the fan is arranged in the fan room of the cabin, and the temperature sensors for monitoring the temperature of different areas in the cabin are respectively arranged in the oil separator room and the central fresh water cooling water area (near the equipment with relatively large heat generation); the air pressure difference inside and outside the cabin is monitored by a pressure sensor, which is arranged at the cabin outlet, for comparing the internal pressure of the cabin with the external pressure, and directly outputting the pressure difference data.

[0018] When the main engine load is greater than or equal to the first percentage (90%), the nacelle fan frequency is controlled to be the maximum frequency; Figure 2 As shown, when the host load is less than the first percentage (90%), the frequency of the cabin fan is controlled to be adjusted in real time according to the size of the host load, which can be adjusted by the linear relationship between the operating frequency range of the cabin fan and the host load (the maximum operating frequency of the cabin fan in this embodiment is 60Hz, the minimum operating frequency is 30Hz, and different frequencies linearly correspond to different power outputs); The corresponding cabin fan frequencies are controlled according to the temperature values ​​of different areas in the cabin (the temperature values ​​of different areas in the cabin include the temperature of the oil separator room and the temperature of other areas in the cabin. When the temperature of the oil separator room is abnormal, only the cabin fan frequency responsible for the oil separator room area is controlled. When the temperature of other areas in the cabin is abnormal, the frequency of all cabin fans is controlled), so that each fan can operate at the appropriate power point; the cabin fan frequency is controlled by whether the pressure difference exceeds the set value.

[0019] In this embodiment, during the fan frequency adjustment process, the priority of the fan exhaust temperature, the air pressure difference between the inside and outside of the cabin, and the temperature values ​​of different areas in the cabin is higher than the priority of the main engine load condition; while the priority of the fan exhaust temperature, the air pressure difference between the inside and outside of the cabin, and the temperature values ​​of different areas in the cabin are equal.

[0020] Specifically, in this embodiment, there are five cabin fans, No. 1 to No. 5, among which No. 4 and No. 5 fans also take into account the air supply between the oil separators. The frequency control process is as follows: Step S11, when the fan is operating normally, when it is monitored that the fan exhaust temperature is higher than the first frequency modulation setting value (≥41°C), the frequency of all fans (fans 1 to 5) is controlled to increase; At the same time, when it is detected that the pressure difference between the inside and outside of the cabin is lower than the fourth set value (5Pa) and lasts for 10 seconds, the frequency of all fans is controlled to the highest frequency (60Hz); Step S12, adjusting the corresponding cabin fan frequency according to the temperature of different areas in the cabin; Specifically, when it is monitored that the temperature in other areas of the engine room is higher than the second frequency modulation setting value (≥41°C), the frequency of all fans (fans 1 to 5) is controlled to increase; when it is monitored that the temperature in the oil separator room is higher than the third frequency modulation setting value (≥41°C), the frequency of fans (fans 4 and 5) in the relevant areas of the oil separator room is controlled to increase. The above frequency increase steps can be set to fixed steps, or a corresponding temperature and step relationship table or curve can be preset; When the temperature in other areas of the engine room is detected to be higher than the second alarm setting value (≥44°C), all fans are controlled to have the highest frequency (the frequency of fans 1 to 5 is 60Hz), and a high engine room temperature alarm is issued; when the temperature in the oil separator room is detected to be higher than the first alarm setting value (≥44°C), the fan frequency in the relevant areas of the oil separator room is controlled to have the highest frequency (the frequency of fans 4 and 5 is 60Hz), and a high engine room temperature alarm is issued; Step S13, after adjusting the fan frequency through steps S11 and S12, feeding back the current fan frequency to the cabin fan frequency control program; When the fan is operating normally, and the temperature inside the cabin and the pressure difference between inside and outside the cabin are normal, control all fan control programs according to the attached Figure 2 The frequency of all engine room fans is adjusted according to the overall load of the current main engine. Specifically, Figure 2 As shown, when the host load is greater than or equal to the first percentage (90%), the cabin fan frequency is controlled to be the maximum frequency (60Hz); when the host load is 0%, the cabin fan frequency is controlled to reach the minimum, which is 30Hz; when the host load is between 0% and the first percentage (90%), the cabin fan frequency is controlled to be adjusted in real time according to the size of the host load, and the adjustment is made through the linear relationship between the operating frequency range of the cabin fan and the host load (different frequency linearities correspond to different power outputs).

[0021] Step S14, after the fan frequency is adjusted in the above steps, return to step S11 to perform a loop judgment; In addition, it can be set to directly control the frequency of all cabin fans to the highest frequency when the program is abnormal.

[0022] like Figure 3 As shown, in some other embodiments, a specific program alarm process is also provided, including: After the fan frequency is adjusted in steps S11 and S12, when the temperature at any point is monitored to be higher than the corresponding alarm setting value (set to 44°C in this embodiment), a high cabin temperature alarm is issued; the arbitrary point temperature includes the fan exhaust temperature, the oil separator room temperature and the cabin temperature (when the fan exhaust temperature and the cabin temperature are abnormal, the fan frequency is controlled; when the monitored temperature reaches the alarm value, an alarm is issued, and the setting value of the temperature alarm value is higher than the setting value of the corresponding temperature abnormality value, which are set to 44°C and 41°C in this embodiment respectively); In step S11, after monitoring that the pressure difference between the inside and outside of the cabin is lower than the fourth set value (5Pa) and lasts for 10 seconds, all fans are controlled to have the highest frequency. If the pressure difference is still lower than the fourth set value (5Pa) after 5 minutes, a low pressure alarm is issued. After 10 minutes, the pressure difference is monitored again. If the pressure difference is higher than the fourth set value (5Pa), the fan frequency is adjusted according to the host load at this time. When the pressure difference between the inside and outside of the cabin is detected to be higher than the alarm value, that is, the fifth set value (100Pa), and lasts for 5 minutes, a high pressure alarm is issued; This application can ensure that the engine room fan power is adjusted in time with environmental changes, maintain a proper working environment in the engine room, take appropriate measures to control the fan operation, and make the fan power related to the ship's main engine load. It is also jointly controlled by the engine room ambient temperature and the internal and external pressure difference, and distinguishes the priority control level and control logic of the above conditions.

[0023] 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. An energy-saving control method for a super-large container ship engine room fan, characterized in that: This includes monitoring the load of the main engine, the temperature of the fan exhaust air and the temperature of different areas in the cabin, the air pressure difference inside and outside the cabin, and adjusting the corresponding fan frequency to make it run at the corresponding power point. Among them, the main engine load condition controls the cabin fan frequency accordingly according to the preset relationship between the fan frequency and the main engine load; the corresponding cabin fan frequency is controlled by the temperature values ​​of different areas in the cabin, so that each fan operates at the corresponding power point; the cabin fan frequency is controlled by whether the pressure difference exceeds the set value.

2. The energy-saving control method for a super-large container ship engine room fan according to claim 1 is characterized in that: The preset relationship between the fan frequency and the host load includes: when the host load is greater than or equal to a first percentage, the cabin fan frequency is controlled to be a maximum frequency; when the host load is less than the first percentage, the cabin fan frequency is controlled to be adjusted according to the linear relationship between the operating frequency range of the cabin fan and the host load.

3. The energy-saving control method for a super-large container ship engine room fan according to claim 1 is characterized in that: During the fan frequency adjustment process, the priority of the fan exhaust temperature and the air pressure difference between the inside and outside of the cabin is higher than the priority of the main engine load condition.

4. The energy-saving control method for a super-large container ship engine room fan according to claim 1 or 3, characterized in that: During the fan frequency adjustment process, the temperature values ​​of different areas in the cabin have a higher priority than the host load conditions.

5. The energy-saving control method for a super-large container ship engine room fan according to claim 1 or 3, characterized in that: During the fan frequency adjustment process, the fan exhaust temperature, the air pressure difference between the inside and outside of the cabin, and the temperature values ​​of different areas in the cabin have equal priority.

6. The energy-saving control method for a super-large container ship engine room fan according to claim 1, characterized in that: The temperature values ​​of different areas in the engine room are divided into the temperature of the oil separator room and the temperature of other areas in the engine room. When the fan is operating normally, when it is monitored that the fan exhaust temperature is higher than the first frequency modulation setting value, the frequency of all fans is controlled to increase; when it is monitored that the temperature in other areas of the cabin is higher than the second frequency modulation setting value, the frequency of all fans is controlled to increase; when it is monitored that the temperature in the oil separator room is higher than the third frequency modulation setting value, the frequency of the fans in the relevant areas of the oil separator room is controlled to increase.

7. The energy-saving control method for a super-large container ship engine room fan according to claim 6 is characterized in that: When it is monitored that the temperature in the oil separator room is higher than the first alarm setting value, the fan frequency in the relevant area of ​​the oil separator room is controlled to the highest frequency; when it is monitored that the temperature in other areas of the cabin is higher than the second alarm setting value, the frequency of all fans is controlled to the highest frequency.

8. The energy-saving control method for a super-large container ship engine room fan according to claim 1, characterized in that: When the pressure difference is lower than the fourth set value, all fans are controlled to the highest frequency. If the pressure difference is still lower than the fourth set value after 5 minutes, a low pressure alarm is issued. The pressure difference is monitored again after 10 minutes. If the pressure difference is higher than the fourth set value, the fan frequency is adjusted according to the host load at this time.

9. The energy-saving control method for a super-large container ship engine room fan according to claim 8, characterized in that: When the pressure difference is higher than the fifth set value and lasts for 5 minutes, a high pressure alarm is issued.

10. The energy-saving control method for a super-large container ship engine room fan according to claim 1, characterized in that: The fan exhaust temperature and the temperature of different areas in the cabin are monitored through temperature sensors, and the air pressure difference inside and outside the cabin is monitored through pressure sensors.

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