LNG transport ship isolation void cabin and heavy oil heating system and heating method

Abstract

The invention provides an LNG transport ship isolation void and heavy oil heating system and method. The heating system comprises an air compressor, a front-end compressed air pipeline, an isolation void heating pipeline, a heavy oil heating pipeline, a rear-end compressed air pipeline and an air release unit. The air compressor is used for compressing air; the front-end compressed air pipeline is connected with the air compressor and the isolation void heating pipeline; the isolation void heating pipeline is connected with a heavy oil heating pipeline; the heavy oil heating pipeline is connected with the isolation void heating pipeline and the rear-end compressed air pipeline; the rear-end compressed air pipeline is connected with the air release unit; the air release unit is arranged at the bottom of the ship body and releases compressed air to form an air film. The heat energy of the compressed air is used for isolating a void cabin and heating heavy oil, and heat energy recovery is achieved. And multiple functions of isolated void heating, heavy oil heating, air lubrication and the like can be realized without additionally arranging an ethylene glycol water pipeline and inputting steam heat energy. The weight of an empty ship is reduced, and cost and energy consumption are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship technology, in particular to a LNG carrier segregated ballast tank and heavy oil heating system and a heating method. BACKGROUND

[0002] The segregated ballast tank of the cargo hold area of the LNG carrier needs to be heated by steam to heat the ethylene glycol water, and then the ethylene glycol water is used to heat the segregated ballast tank through the pipeline to prevent the low-temperature brittleness of the structure steel plate of the segregated ballast tank. The heavy oil in the heavy oil tank needs to be heated to maintain its fluidity. The traditional method relies on steam heating, which has the problems of high steam energy consumption and large boiler load. At the same time, the air lubrication system of the ship releases compressed air to form a bubble layer at the bottom of the ship to reduce the sailing resistance of the ship. However, the high temperature (usually about 120-180℃) generated by the compressed air of the air lubrication system is not effectively utilized, and an additional cooling system is needed to cool the compressed air or expensive duplex stainless steel material is used to prevent the corrosion of the compressed air pipeline in the ballast water tank. SUMMARY

[0003] (I) Technical problems to be solved The technical problem to be solved by the present application is that in the prior art, the segregated ballast tank and the heavy oil need to be heated by additional pipelines and corresponding heat sources, and the heat energy generated by the air lubrication system is not utilized, resulting in cost redundancy and energy waste.

[0004] (II) Technical solutions To achieve the above-mentioned purpose, the technical scheme adopted by the present application is: In a first aspect, the present application provides a LNG carrier segregated ballast tank and heavy oil heating system, comprising an air compressor, a front-end compressed air pipeline, a segregated ballast tank heating pipeline, a heavy oil heating pipeline, a rear-end compressed air pipeline and an air release unit; the air compressor is arranged in the chief officer's storeroom at the bow, and the air compressor is used to compress air to form compressed air; the front-end compressed air pipeline is arranged in the chief officer's storeroom at the bow, the inlet of which is connected to the air compressor, and the outlet of which is connected to the segregated ballast tank heating pipeline; the segregated ballast tank heating pipeline is arranged in the segregated ballast tank, the inlet of which is connected to the front-end compressed air pipeline, and the outlet of which is connected to the heavy oil heating pipeline; the heavy oil heating pipeline is arranged in the heavy oil tank, the inlet of which is connected to the segregated ballast tank heating pipeline, and the outlet of which is connected to the rear-end compressed air pipeline; the rear-end compressed air pipeline is arranged in the pipe and the ballast water tank at the bottom, the inlet of which is connected to the heavy oil heating pipeline, and the outlet of which is connected to the air release unit; the air release unit is arranged at the bottom of the ship body, and releases compressed air to form an air film to reduce the sailing resistance of the ship.

[0005] Preferably, the compressed air heats the air in the isolated air cabin during the process of flowing through the isolated air cabin heating pipeline, and the heat exchange form includes at least one of heat radiation, heat conduction and heat convection.

[0006] Preferably, the compressed air heats the heavy oil during the process of flowing through the heavy oil heating pipeline, and the heat exchange form includes at least one of heat radiation, heat conduction and heat convection.

[0007] Preferably, the heating pipeline is arranged in a spiral S shape.

[0008] Preferably, a temperature controller and a temperature sensor are further included, the temperature sensor is arranged in the heavy oil cabin, and the temperature controller is electrically connected with the temperature sensor and the air compressor.

[0009] Preferably, the material of the front-end compressed air pipeline, the isolated air cabin heating pipeline, the heavy oil heating pipeline and the rear-end compressed air pipeline is carbon steel material.

[0010] In a second aspect, the application further provides a heating method, which is based on the LNG transport ship isolated air cabin and heavy oil heating system and includes the following steps: The air compressor compresses air to form compressed air; During the process of the high-temperature compressed air passing through the isolated air cabin heating pipeline, the air in the isolated air cabin is heated by the surface of the heating pipeline, and at the same time, the compressed air is cooled; During the process of the cooled compressed air passing through the heavy oil heating pipeline, the heavy oil is heated by the surface of the heating pipeline, and at the same time, the compressed air is further cooled; The cooled compressed air is released to the bottom of the ship body through the air release unit to form an air film. The above technical scheme of the application has at least the following advantages: 1. Energy efficiency is greatly improved: through energy cascade utilization, the waste heat of compressed air is used for isolated air cabin heating and heavy oil heating, and energy is fully utilized. The traditional system needs to consume energy for isolated air cabin and heavy oil heating, while the system can realize multiple functions such as isolated air cabin heating, heavy oil heating and air lubrication without additional configuration of the above pipeline and heat energy input.

[0011] 2. The cost is significantly reduced: compared with the glycol heating and steam heating system, the system can save a large amount of heat energy loss. At the same time, the configuration of the steam boiler, the glycol heating system in the bow isolated air cabin and its pipeline is reduced, and the cooling system of the compressed air is omitted, reducing the equipment investment and maintenance cost.

[0012] 3. Environmentally friendly: compared with the steam heating system, the system reduces fuel consumption and correspondingly reduces carbon emissions.

[0013] 4. High system reliability: The intelligent temperature control system can accurately control the heavy oil temperature, avoiding the influence of high or low temperature on the normal operation of the engine. The alarm system timely reminds the abnormal situation to ensure the safety of navigation.

[0014] 5. Strong adaptability: The system can be adjusted according to the specific needs of different ships, such as heavy oil tank capacity, navigation area climate conditions, etc., and can meet various working condition requirements by adjusting the compressor parameters and pipeline design.

[0015] 6. Easy maintenance: The system structure is relatively simple, and the main equipment is mature industrial product, which is convenient to maintain.

[0016] 7. Flexible installation: It can be applied to new ships and is also convenient for existing ship modification. The system occupies small space, especially suitable for ships with limited space. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0018] Figure 1 is a structural schematic diagram of the ship isolated air cabin and heavy oil heating system provided by the embodiments of the present application.

[0019] The various reference signs in the drawings are as follows: 1, air compressor; 2, front end compressed air pipeline; 3, isolated air cabin heating pipeline; 4, heavy oil heating pipeline; 5, rear end compressed air pipeline; 6, air release unit. DETAILED DESCRIPTION In order to make the technical problems to be solved by the present application, the technical solutions and beneficial effects more clearly, the following will be further described in detail by combining with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

[0020] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected or indirectly connected to the other element.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and cannot be understood as indicating that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0022] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited. The specific implementation of the present application is described in more detail below in combination with specific embodiments: As Figure 1 shown, the present application provides a ship heavy oil tank heating system, which comprises an air compressor 1, a front-end compressed air pipeline 2, an isolated air tank heating pipeline 3, a heavy oil heating pipeline 4, a rear-end compressed air pipeline 5 and an air release unit 6; the air compressor 1 is arranged in the bosun's store room at the bow of the ship body, and the air compressor 1 is used to compress air into compressed gas; the front-end compressed air pipeline 2 is arranged in the bosun's store room at the bow of the ship body; the isolated air tank heating pipeline 3 is arranged in the isolated air tank, and the inlet thereof is connected with the front-end compressed air pipeline 2; the heavy oil heating pipeline 4 is arranged in the heavy oil tank, the inlet thereof is connected with the isolated air tank heating pipeline 3, and the outlet thereof is connected with the rear-end compressed air pipeline 5; the air release unit 6 is arranged in the pipe hole and the bottom ballast water tank at the bottom of the ship body, the air release unit 6 is connected with the outlet of the rear-end compressed air pipeline 5, and the air release unit 6 is used to form an air film at the bottom of the ship body to reduce the resistance.

[0023] In one embodiment, the heating pipeline can be arranged in a spiral S shape. This design can significantly increase the heat exchange area and improve the heat transfer efficiency.

[0024] In one embodiment, a temperature controller and a temperature sensor are further included, the temperature sensor is arranged in the heavy oil tank, and the temperature controller is electrically connected with the temperature sensor and the air compressor. The temperature controller adopts a PID control algorithm, can automatically adjust the output power of the air compressor according to the detected heavy oil temperature, and realizes precise temperature control. When an abnormal temperature is detected, the temperature controller will also issue an alarm through an alarm device.

[0025] In one embodiment, the material of the heating pipeline can be carbon steel.

[0026] In one embodiment, the air release unit 6 comprises a plurality of micro-porous spray heads. The plurality of micro-porous spray heads are arranged in a matrix, and can form a uniform and stable drag-reducing air film.

[0027] The embodiment of the present application also provides a heating method based on the LNG transport ship isolated cabin and heavy oil heating system, comprising the following steps: Air is compressed by the air compressor 1 to form high-temperature compressed gas; The high-temperature compressed gas is introduced into the cabin heating pipeline 3 arranged in the isolated cabin through the front-end compressed air pipeline 2; The isolated cabin is heated by using the heat on the surface of the cabin heating pipeline 3, and the high-temperature compressed air is cooled to a certain extent, and then introduced into the heavy oil heating pipeline 4; After the high-temperature compressed air enters the heavy oil heating pipeline 4, the heavy oil in the heavy oil cabin is heated by using the heavy oil heating pipeline 4, and then introduced into the rear-end compressed air pipeline 5, during which the high-temperature compressed air is further cooled; The compressed gas after heat exchange is released to the bottom of the ship body through the air release unit 6 to form an air film.

[0028] Specifically, the LNG transport ship isolated cabin and heavy oil heating system and the heating method of the present application comprise six main parts: the air compressor 1, the front-end compressed air pipeline 2, the isolated cabin heating pipeline 3, the heavy oil heating pipeline 4, the rear-end compressed air pipeline 5 and the air release unit 6. The air compressor 1 is preferably installed in the chief officer's storeroom at the bow of the ship and is installed by elastic support damping.

[0029] The air compressor 1 interface and the front-end compressed air pipeline 2 are provided with a thermal insulation layer to avoid injury to personnel and maintain the temperature of the compressed air.

[0030] The isolated cabin heating pipeline 3 is provided with a thermal insulation layer, so that the surface temperature is between 75℃ and 90℃.

[0031] The heating pipeline can adopt a spiral S shape design to significantly increase the heat exchange area.

[0032] The temperature sensor is a PT100 temperature sensor. The temperature sensor is installed at different positions of the heavy oil cabin to monitor the oil temperature in real time. The PLC adopts a PID control algorithm to automatically adjust the compressor operating frequency according to the set temperature (usually 45℃). When the temperature exceeds 50℃ or is lower than 30℃, the alarm gives an alarm.

[0033] The air release unit 6 can be made of stainless steel or high-carbon steel and comprises a plurality of microporous nozzles arranged in a matrix. A pressure regulating valve and a vortex flowmeter are installed in front of the nozzles, the working pressure is set to 1.65barg, the flow is controlled to be 46m³ / min, and the compressed air release can be adjusted according to the sailing conditions.

[0034] In actual operation, the high-temperature compressed gas (about 120-180℃) generated by the air compressor 1 firstly enters the front-end compressed air pipeline 2, then flows through the process of the isolated cabin heating pipeline 3 to heat the air in the isolated cabin, and then enters the heavy oil heating pipeline 4, and the oil temperature is heated to 35-45℃ through heat exchange with the heavy oil. In this process, the gas temperature is reduced to about 40℃, enters the rear-end compressed air pipeline 5, and finally forms a lubricating gas film at the bottom of the ship through the air release unit 6.

[0035] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An LNG carrier segregated ballast and heavy fuel oil heating system, characterized in that, The application relates to a ship air heating system, which comprises the following parts: an air compressor, a front compressed air pipeline, an isolated air cabin heating pipeline, a heavy oil heating pipeline, a rear compressed air pipeline and an air release unit; the air compressor is arranged in a first officer storage room, and the air compressor is used for compressing air to form compressed air; the front compressed air pipeline is arranged in the first officer storage room, the inlet of the front compressed air pipeline is connected with the air compressor, and the outlet of the front compressed air pipeline is connected with the isolated air cabin heating pipeline; the isolated air cabin heating pipeline is arranged in an isolated air cabin, the inlet of the isolated air cabin heating pipeline is connected with the front compressed air pipeline, and the outlet of the isolated air cabin heating pipeline is connected with the heavy oil heating pipeline; the heavy oil heating pipeline is arranged in a heavy oil cabin, the inlet of the heavy oil heating pipeline is connected with the isolated air cabin heating pipeline, and the outlet of the heavy oil heating pipeline is connected with the rear compressed air pipeline; the rear compressed air pipeline is arranged in a pipeline and a bottom ballast water cabin, the inlet of the rear compressed air pipeline is connected with the heavy oil heating pipeline, and the outlet of the rear compressed air pipeline is connected with the air release unit; the air release unit is arranged at the bottom of the ship body, and the compressed air is released to form an air film and reduce the sailing resistance of the ship. The compressed air heats the air in the isolated air cabin in the process of flowing through the isolated air cabin heating pipeline, and the heat exchange forms includes at least one of heat radiation, heat conduction and heat convection.

2. An LNG carrier segregated ballast and heavy fuel oil heating system as claimed in claim 1, characterised in that, The compressed air heats the heavy oil in the process of flowing through the heavy oil heating pipeline, and the heat exchange forms includes at least one of heat radiation, heat conduction and heat convection.

3. An LNG carrier segregated ballast and heavy fuel oil heating system as claimed in claim 1, wherein, The heavy oil heating pipeline is arranged in a spiral S shape.

4. An LNG carrier segregated ballast and heavy fuel oil heating system as claimed in claim 1, wherein, The application further comprises a temperature controller and a temperature sensor, the temperature sensor is arranged in the heavy oil cabin, and the temperature controller is electrically connected with the temperature sensor and the air compressor.

5. An LNG carrier segregated ballast and heavy fuel oil heating system as claimed in claim 1 wherein, The materials of the front compressed air pipeline, the isolated air cabin heating pipeline, the heavy oil heating pipeline and the rear compressed air pipeline are carbon steel materials.

6. An LNG carrier segregated ballast and heavy fuel oil heating system as claimed in claim 1 wherein, The application further comprises the following steps:

7. A method of heating, carried out on the basis of a heavy fuel oil heating system of an isolated hold of an LNG carrier according to any one of claims 1 to 6, characterized in that, The air compressor compresses air to form compressed air; In the process of passing through the isolated air cabin heating pipeline, the compressed air is cooled while heating the air in the isolated air cabin through the surface of the heating pipeline; In the process of passing through the heavy oil heating pipeline, the compressed air is further cooled while heating the heavy oil through the surface of the heating pipeline; The cooled compressed air is released to the bottom of the ship body through the air release unit to form an air film. ​

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