System for restarting marine generator set after stopping in heavy oil mode

Abstract

The invention relates to a system for restarting a marine generator set after stopping in a heavy oil mode, which comprises a pipeline arranged between a light oil pipeline and a heavy oil pipeline and a light oil pump, the light oil pump is arranged on the light oil pipeline, the pipeline is provided with a remotely controlled valve group, and the valve group comprises a pneumatic check valve and an electromagnetic valve. The pipeline is further connected with a compressed air pipeline, whether compressed air enters the pneumatic check valve or not is controlled based on the electromagnetic valve, in the normal working state, the control system controls the electromagnetic valve to be in the closed state, and when the heavy oil mode operation is shut down due to faults, the control system controls the electromagnetic valve to be in the open state. Compressed air is supplied to the pneumatic check valve through the electromagnetic valve, the check valve is opened, and light oil is driven by the light oil pump to enter a heavy oil system. Under the condition that the marine generator set does not have the heavy oil start-stop function, the pneumatic light oil pump, the heavy oil standby pipeline entering light oil and the remote control valve bank are used for achieving abnormal shutdown and restart of the generator set in the heavy oil mode, and energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of design of marine generator sets, and in particular to a system for restarting a marine generator set after it stops in a heavy oil mode. Background Art

[0002] Marine generator sets can use new energy sources such as natural gas or methanol as fuel, and can also use heavy oil or light oil as fuel. When heavy oil is used as fuel, it is called heavy oil mode. Many marine light oil generator sets do not have the function of direct start and stop in heavy oil mode. In heavy oil mode, once they suddenly stop due to a fault, they cannot be directly started again with heavy oil, because the emergency generator set will start to power the entire ship when the main generator set stops, but due to its low power, it cannot make the pump of the generator set's heavy oil system run. The crew needs to switch to the light oil system and then start it. Switching to the light oil system requires operating valves and other operations, which is complicated and cannot be completed in a short time when the whole ship is powered off. The conventional response method can only be to start another backup generator set using a light oil system to power the entire ship. If there is no backup generator set that can be started, then the entire ship will lose power and the ship will be in a powerless state, which is an out-of-control state.

[0003] In summary, the prior art has the following shortcomings: 1. In order to prevent the generator set from shutting down abnormally when operating in heavy oil mode, the prior art always requires an additional generator set to be in standby status in light oil mode. When the generator set in heavy oil mode suddenly shuts down, the standby machine needs to be started. In this way, the light oil system of the standby machine needs to be running all the time to ensure that the standby machine can be started as soon as possible. The continuous operation of the light oil system results in high energy consumption and high maintenance costs for the crew. 2. The light oil system of the generator set is always in operation and is prone to failure. If the light oil system fails and cannot operate, there will be no standby generator set in light oil mode. In this way, it is impossible to risk letting the generator set use heavy oil again. The heavy oil system can only be switched to light oil, and burning light oil will increase costs. Summary of the invention

[0004] According to the technical problem raised above, a system for restarting a marine generator set after stopping in heavy oil mode is provided. The present invention is applicable to marine generator sets that do not have a heavy oil start-stop function. After stopping in heavy oil mode, the generator set can be restarted quickly and directly without switching to a light oil system. There is no need to keep an additional light oil system generator set as a backup during operation.

[0005] The technical means adopted by the present invention are as follows:

[0006] A system for restarting a marine generator set after it stops in a heavy oil mode, comprising a pipeline and a light oil pump arranged between a light oil pipeline and a heavy oil pipeline, the light oil pump being arranged on the light oil pipeline, a remotely controlled valve group being arranged on the pipeline, the valve group comprising a pneumatic check valve and a solenoid valve, a compressed air pipeline being also connected to the pipeline, and the solenoid valve controls whether compressed air enters the pneumatic check valve. Under normal working conditions, the control system controls the solenoid valve to be in a closed state. When the heavy oil mode operation stops due to a fault, the control system controls the solenoid valve to be in an open state, compressed air is supplied to the pneumatic check valve through the solenoid valve, the check valve opens, and light oil enters the heavy oil system driven by the light oil pump.

[0007] Furthermore, the light oil pump is a pneumatic light oil pump, which is provided with pneumatic power through a compressed air pipeline.

[0008] Furthermore, a cylinder jacket water preheating system is also provided, which includes a temperature sensor and a heating device. The temperature sensor is used to monitor the temperature of the cylinder jacket water, and the heating device is used to complete the heating of the cylinder jacket water. The control system is connected to the temperature sensor and the heating device. When the heavy oil mode is shut down due to a fault, the heating device is controlled to be turned on and off based on the data transmitted by the temperature sensor.

[0009] Furthermore, the temperature sensor monitors a temperature of 70°C. When the jacket water temperature drops below 70°C, the preheating system starts the heating function. When the jacket water temperature is heated to over 70°C, the heating stops automatically.

[0010] Compared with the prior art, the present invention has the following advantages: when the marine generator set does not have the heavy oil start-stop function, by adding a pneumatic light oil pump, the light oil enters the heavy oil standby pipeline, and the valve group is remotely controlled to realize the abnormal shutdown and restart of the generator set in the heavy oil mode, and there is no need to have an additional light oil generator set on standby, which reduces energy consumption. The generator set cylinder jacket water preheating system monitors the generator set cylinder jacket water temperature, so that the cylinder jacket water temperature is always maintained above 70°C regardless of whether the generator set is running or not, meeting the conditions for using heavy oil. The light oil pump is driven by compressed air. In the event of a power outage on the entire ship, the light oil system can still operate normally, so that the generator set has the conditions for starting. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 It is a simplified diagram of the system of the present invention.

[0013] Figure 2 It is a schematic diagram of pipeline connection for specific working conditions of the present invention.

[0014] In the figure: 1. Light oil pump; 2. Solenoid valve; 3. Pneumatic check valve; 4. Control system. DETAILED DESCRIPTION

[0015] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0018] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0019] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0020] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0021] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0022] When the generator set is shut down due to a fault while operating in heavy oil mode, the fuel system of the generator set is the heavy oil system. After the generator set is shut down, the entire ship loses power. After starting the emergency generator set, it can provide power for lighting and necessary control systems, but it cannot provide power for the pump of the heavy oil system. The system cannot run and the generator set cannot be started.

[0023] For this reason, Figure 1 , Figure 2 As shown, the embodiment of the present invention discloses a system for restarting a marine generator set after stopping in a heavy oil mode, comprising a system arranged in a light oil pipeline ( Figure 2 Medium Green Pipeline) and Heavy Oil Pipeline ( Figure 2 The pipeline between the purple pipeline ( Figure 2The light oil pump is arranged on the light oil pipeline, and a remote-controlled valve group is arranged on the pipeline. The valve group includes a pneumatic check valve 3 and a solenoid valve 2. A compressed air pipeline is also connected to the pipeline. The solenoid valve controls whether the compressed air enters the pneumatic check valve. Under normal working conditions, the control system 4 controls the solenoid valve to be in a power-off state, that is, in a closed state. The compressed air cannot supply air to the pneumatic check valve through the solenoid valve, and the pneumatic check valve is in a closed state. When the heavy oil mode stops due to a fault, the control system controls the solenoid valve to be in an open state, and compressed air supplies air to the pneumatic check valve through the solenoid valve. The check valve opens, and the light oil enters the heavy oil system under the drive of the light oil pump. The present invention realizes the supply of light oil to the generator set without switching the system, so that the generator set has the starting conditions.

[0024] Furthermore, the light oil pump is a pneumatic light oil pump, which is pneumatically powered by a compressed air pipeline. The light oil pump is driven by compressed air, so that the light oil system can still operate normally in the event of a power outage on the entire ship, so that the generator set is ready for starting.

[0025] Since there is residual heavy oil in the heavy oil pipeline and the generator set body when the generator set is shut down, in order to enable the heavy oil to be burned when the generator set is started again, the cylinder liner of the generator set needs to be in a warm cylinder state. As an optional implementation, a cylinder liner water preheating system is also provided, and the cylinder liner water preheating system includes a temperature sensor and a heating device. The temperature sensor is used to monitor the temperature of the cylinder liner water, and the heating device is used to complete the heating of the cylinder liner water. The control system is connected to the temperature sensor and the heating device. When the heavy oil mode is shut down due to a fault, the heating device is controlled to be turned on and off based on the data transmitted by the temperature sensor.

[0026] Furthermore, the temperature sensor monitors a temperature of 70°C. When the jacket water temperature drops below 70°C, the preheating system starts the heating function. When the jacket water temperature is heated to over 70°C, the heating stops automatically.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for restarting a marine generator set after it stops in heavy oil mode, characterized in that: It includes a pipeline and a light oil pump arranged between the light oil pipeline and the heavy oil pipeline. The light oil pump is arranged on the light oil pipeline. A remote-controlled valve group is arranged on the pipeline. The valve group includes a pneumatic check valve and a solenoid valve. A compressed air pipeline is also connected to the pipeline. The solenoid valve controls whether compressed air enters the pneumatic check valve. Under normal working conditions, the control system controls the solenoid valve to be in a closed state. When the heavy oil mode is shut down due to a fault, the control system controls the solenoid valve to be in an open state. Compressed air supplies air to the pneumatic check valve through the solenoid valve. The check valve opens, and the light oil enters the heavy oil system driven by the light oil pump.

2. The system for restarting a marine generator set after stopping in heavy oil mode according to claim 1, characterized in that: The light oil pump is a pneumatic light oil pump, which is provided with pneumatic power through a compressed air pipeline.

3. The system for restarting a marine generator set after stopping in heavy oil mode according to claim 1, characterized in that: It is also equipped with a cylinder jacket water preheating system, which includes a temperature sensor and a heating device. The temperature sensor is used to monitor the temperature of the cylinder jacket water, and the heating device is used to complete the heating of the cylinder jacket water. The control system is connected to the temperature sensor and the heating device. When the machine stops due to a fault in the heavy oil mode, the opening and closing of the heating device is controlled based on the data transmitted by the temperature sensor.

4. The system for restarting a marine generator set after stopping in heavy oil mode according to claim 3, characterized in that: The temperature monitored by the temperature sensor is 70℃. When the jacket water temperature drops below 70℃, the preheating system will start the heating function. When the jacket water temperature exceeds 70℃, the heating will stop automatically.

Images