Marine methanol single fuel supply temperature control system

Abstract

The invention discloses a marine methanol single fuel supply temperature control system, and belongs to the field of methanol fuel temperature control. A marine methanol single fuel supply temperature control system comprises a water ethylene glycol pump, a methanol water ethylene glycol heat exchanger, an electric heater, a water ethylene glycol cylinder sleeve water heat exchanger and a three-way temperature adjusting valve, and the input end of the water ethylene glycol pump is communicated with the output end of the methanol water ethylene glycol heat exchanger; electric heating and waste heat of main engine cylinder sleeve water are used as heat sources, water glycol is used as a closed circulating medium, the heat sources are switched through a three-way temperature adjusting valve, before an engine or a generator is started, electric heating is used as a temporary heat source, and methanol fuel is heated to the required temperature through heat exchange of the water glycol; and after the engine or the generator is started, electric heating is stopped, the waste heat of the cylinder sleeve water is used as a heat source, additional energy consumption does not need to be increased, the energy utilization rate is increased, and the ship operation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of methanol fuel temperature control, and particularly to a marine methanol single-fuel supply temperature control system. Background Art

[0002] Methanol is a liquid at room temperature, which is convenient for storage and transportation and is considered as a preferred clean fuel to replace petroleum. At present, in the marine field, methanol has begun to be applied in batches as a fuel, especially on domestic small ships, and the dual-fuel mode of methanol-diesel has been in actual ship operation as the main power.

[0003] Since methanol single-fuel engines or generators do not have a diesel system, they have relatively high requirements for the temperature of methanol fuel during the startup phase. Especially in areas with lower temperatures, the methanol fuel needs to be heated to a certain temperature before startup. However, due to space and usage limitations, small ships generally do not have a boiler heat source configured. As a result, there is no heat source to heat the methanol fuel during the startup phase of methanol single-fuel engines or generators, leading to the inability of the ship to start and operate. If an additional heat source is added, the energy consumption will be relatively large, resulting in an increase in the operating cost of the ship. Therefore, a marine methanol single-fuel supply temperature control system is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that during the startup phase of methanol single-fuel engines or generators, there is no heat source to heat the methanol fuel, resulting in the inability of the ship to start and operate. If an additional heat source is added, the energy consumption will be relatively large, resulting in an increase in the operating cost of the ship, and to propose a marine methanol single-fuel supply temperature control system.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A marine methanol single-fuel supply temperature control system includes a water-ethylene glycol pump, a methanol-water-ethylene glycol heat exchanger, an electric heater, a water-ethylene glycol jacket water heat exchanger, and a three-way temperature control valve. The input end of the water-ethylene glycol pump is communicated with the output end of the methanol-water-ethylene glycol heat exchanger. The input end of the water-ethylene glycol pump is respectively communicated with the input ends of the electric heater and the water-ethylene glycol jacket water heat exchanger. The output end of the electric heater is communicated with one input end of the three-way temperature control valve. The output end of the water-ethylene glycol jacket water heat exchanger is communicated with the other input end of the three-way temperature control valve. The output end of the three-way temperature control valve is communicated with the input end of the methanol-water-ethylene glycol heat exchanger. Among them, an input port and an output port pipeline of methanol fuel are provided on the side wall of the methanol-water-ethylene glycol heat exchanger, and an input port and an output port pipeline of jacket water are provided on the side wall of the water-ethylene glycol jacket water heat exchanger.

[0006] To improve the safety of use, preferably, an expansion tank is provided on the connecting pipe between the water glycol pump and the methanol-water glycol heat exchanger. The expansion tank is equipped with a liquid level detection sensor and a water replenishment port. When the liquid level in the expansion tank is too low, it automatically replenishes water or reminds the crew to operate manually. When the liquid level in the expansion tank is too high, it automatically stops replenishing water or reminds the crew to operate manually. The expansion tank is equipped with a combustible gas detector, which alarms when combustible gas is detected in the expansion tank, warning the crew that there may be methanol leakage.

[0007] To improve the heat exchange efficiency, preferably, heat exchange plates are fixedly connected inside the methanol-water glycol heat exchanger. Heat exchange channels are provided inside the heat exchange plates. The two ends of the heat exchange channels are respectively connected to the input port and output port pipelines of the methanol fuel through pipes. A plurality of groups of heat exchange holes are equidistantly provided on the heat exchange plates.

[0008] Furthermore, guide vanes are fixedly connected to both sides of the heat exchange plates, and the guide vanes on both sides are arranged staggeredly. The number of guide vanes matches the number of heat exchange holes, and each group of guide vanes is located above its corresponding heat exchange hole.

[0009] Furthermore, the ends of the guide vanes are inclined towards the input end of the methanol-water glycol heat exchanger. When the water flow flows along the methanol-water glycol heat exchanger, it passes through the heat exchange holes under the blocking action of the guide vanes.

[0010] To improve the heat exchange efficiency, preferably, a serpentine heat exchange tube is installed inside the water glycol jacket water heat exchanger. The two ends of the serpentine heat exchange tube are respectively connected to the input port and output port pipelines of the jacket water through hoses.

[0011] To prevent impurities in the jacket water from precipitating and caking inside the serpentine heat exchange tube, preferably, telescopic sleeve rods are fixedly connected to both sides of the bottom and top of the inner cavity of the water glycol jacket water heat exchanger. The telescopic part of the telescopic sleeve rod is fixedly connected to the serpentine heat exchange tube, and a return spring is sleeved outside the telescopic sleeve rod. An expansion valve is provided at the top input port of the water glycol jacket water heat exchanger.

[0012] To facilitate the precise control of the heating temperature of the methanol fuel, preferably, a temperature sensor one is provided on the methanol output port pipeline of the methanol-water glycol heat exchanger, and a temperature sensor two is provided on the connecting pipeline between the three-way temperature control valve and the methanol-water glycol heat exchanger.

[0013] Furthermore, the electric heater, the temperature sensor one, and the temperature sensor two are connected by PLC control, and the heating temperature inside the electric heater is 30 - 50 °C.

[0014] Preferably, the heating power of the electric heater is adjusted in the form of a thyristor or a relay. The electric heater is equipped with overheat protection inside, and temperature sensors are provided at both the inlet and outlet of the electric heater.

[0015] Compared with the prior art, the present invention provides a marine methanol single-fuel supply temperature control system, which has the following beneficial effects: 1. The marine methanol single-fuel supply temperature control system uses electric heating and the waste heat of the main engine cylinder jacket water as heat sources, uses water-glycol as a closed-loop circulation medium, and switches the heat source through a three-way temperature control valve. Before the engine or generator starts, electric heating is used as a temporary heat source, and through heat exchange with water-glycol, the methanol fuel is heated to the required temperature. Then, after the engine or generator starts, the electric heating is turned off, and the waste heat of the cylinder jacket water is used as the heat source, without increasing additional energy consumption, improving energy utilization efficiency, and reducing the operating cost of the ship.

[0016] 2. The marine methanol single-fuel supply temperature control system, through the setting of the deflector and heat exchange holes, makes the water-glycol stagger through each group of heat exchange holes along the deflector during the process of water-glycol passing through the methanol-water-glycol heat exchanger, so as to better exchange heat with the methanol fuel in the heat exchange channel, and use the blocking effect of the deflector to slow down the flow rate of water-glycol in the methanol-water-glycol heat exchanger, increase the passing time of water-glycol in the methanol-water-glycol heat exchanger, thereby increasing the heat exchange time between water-glycol and methanol fuel, enabling the methanol fuel to quickly reach the required temperature for use, and improving the temperature control efficiency.

[0017] 3. The marine methanol single-fuel supply temperature control system, through the setting of the expansion valve, compresses the water-glycol entering the water-glycol cylinder jacket water heat exchanger. When the opening pressure of the expansion valve is reached, the water-glycol with impact force will impact the force-bearing plate, causing the overall downward movement of the serpentine heat exchange tube. When the above-mentioned impact force disappears, under the resilience of multiple reset springs, the serpentine heat exchange tube will reset, thereby making the water flow in the serpentine heat exchange tube move, effectively avoiding the precipitation and condensation of impurities in the water flow, improving the fluidity in the serpentine heat exchange tube, and ensuring the heat exchange effect of the serpentine heat exchange tube during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the frame structure of a marine methanol single-fuel supply temperature control system proposed by the present invention; Figure 2 is a schematic diagram of the local structure connection of a marine methanol single-fuel supply temperature control system proposed by the present invention; Figure 3 is a marine methanol single-fuel supply temperature control system proposed by the present invention Figure 2 of the transverse sectional structure schematicFigure 1 ; Figure 4 For a marine methanol single - fuel supply temperature control system proposed by the present invention Figure 2 Schematic transverse - section structure Figure 2 ; Figure 5 Schematic vertical - section structure diagram of the methanol - water - ethylene - glycol heat exchanger of a marine methanol single - fuel supply temperature control system proposed by the present invention.

[0019] In the figure: 1. Ethylene - glycol - water pump; 2. Methanol - water - ethylene - glycol heat exchanger; 21. Heat - exchange plate; 22. Heat - exchange channel; 23. Heat - exchange hole; 24. Deflector; 3. Electric heater; 4. Ethylene - glycol - water jacket - water heat exchanger; 41. Serpentine heat - exchange tube; 42. Telescopic sleeve rod; 43. Return spring; 44. Force - receiving plate; 5. Three - way temperature - regulating valve; 6. Expansion tank; 61. Liquid - level detection sensor; 62. Water - replenishing port; 63. Combustible - gas detector; 7. Temperature sensor I; 71. Temperature sensor II. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] Embodiment 1: Referring to Figures 1 - 5 , a marine methanol single - fuel supply temperature control system includes an ethylene - glycol - water pump 1, a methanol - water - ethylene - glycol heat exchanger 2, an electric heater 3, an ethylene - glycol - water jacket - water heat exchanger 4, and a three - way temperature - regulating valve 5. The methanol - water - ethylene - glycol heat exchanger 2 uses ethylene - glycol as an intermediate heat - exchange medium, and the ethylene - glycol - water pump 1 provides the circulating flow rate and power. And this circulation is a closed - loop circulation, which can prevent the accidental leakage of methanol from polluting other water - way systems on the ship, improving safety and reliability. The flow rate of the ethylene - glycol - water pump 1 is 3 m 3 / h, with a head of 50m. The input end of the water glycol pump 1 is connected to the output end of the methanol-water glycol heat exchanger 2. The input end of the water glycol pump 1 is respectively connected to the input ends of the electric heater 3 and the water glycol jacket water heat exchanger 4. The output end of the electric heater 3 is connected to one side input end of the three-way temperature control valve 5. The output end of the water glycol jacket water heat exchanger 4 is connected to the other side input end of the three-way temperature control valve 5. The output end of the three-way temperature control valve 5 is connected to the input end of the methanol-water glycol heat exchanger 2. Among them, an input port and an output port pipeline of methanol fuel are arranged on the side wall of the methanol-water glycol heat exchanger 2, and an input port and an output port pipeline of jacket water are arranged on the side wall of the water glycol jacket water heat exchanger 4.

[0023] Refer to Figure 1 , among which, a temperature sensor 7 is arranged on the methanol output port pipeline of the methanol-water glycol heat exchanger 2, and a temperature sensor 71 is arranged on the connecting pipeline between the three-way temperature control valve 5 and the methanol-water glycol heat exchanger 2. The electric heater 3, the temperature sensor 7 and the temperature sensor 71 are connected through PLC control. And the heating temperature in the electric heater 3 is 30 - 50°C. The heating power of the electric heater 3 is adjusted in the form of thyristor or relay. The electric heater 3 is equipped with overheat protection, and the overheat protection adopts the existing technology to avoid abnormal situations of too high temperature inside the electric heater 3, improving the protection effect on the electric heater 3. And temperature sensors are equipped at both the inlet and outlet of the electric heater 3. The setting of the temperature sensors is for the convenience of realizing precise temperature control. Through the coordinated setting among the electric heater 3, the temperature sensor 7 and the temperature sensor 71, the methanol temperature can be quickly and stably controlled within the required range, improving the temperature control efficiency of the methanol fuel.

[0024] Refer to Figure 1 , among which, an expansion tank 6 is arranged on the connecting pipeline between the water glycol pump 1 and the methanol-water glycol heat exchanger 2. The expansion tank 6 is mainly used to supplement the water evaporated during the closed-loop cycle. Among them, the expansion tank 6 is equipped with a liquid level detection sensor 61 and a water replenishment port 62. When the liquid level in the expansion tank 6 is too low, it automatically replenishes water or reminds the crew to operate manually. When the liquid level in the expansion tank 6 is too high, it automatically stops replenishing water or reminds the crew to operate manually. Among them, the expansion tank 6 is equipped with a combustible gas detector 63, which alarms when combustible gas is detected in the expansion tank 6, warning the crew that there may be methanol leakage.

[0025] Refer to Figures 3 - 5, wherein, a heat exchange plate 21 is fixedly connected inside the methanol-water-ethylene glycol heat exchanger 2, a heat exchange channel 22 is formed inside the heat exchange plate 21, two ends of the heat exchange channel 22 are respectively connected to the input port and output port of the methanol fuel through pipelines, a plurality of groups of heat exchange holes 23 are equidistantly formed on the heat exchange plate 21, guide vanes 24 are fixedly connected to both sides of the heat exchange plate 21, and the guide vanes 24 on both sides are arranged staggeredly. The number of the guide vanes 24 matches that of the heat exchange holes 23, and each group of guide vanes 24 is located above its corresponding heat exchange hole 23; the end of the guide vane 24 inclines towards the input end of the methanol-water-ethylene glycol heat exchanger 2. When water flows along the methanol-water-ethylene glycol heat exchanger 2, it passes through the heat exchange holes 23 under the blocking action of the guide vanes 24. Here, the guide vanes 24 are made of heat-conducting materials and can further conduct heat exchange. The heat exchange holes 23 are inclined, that is, the end close to the guide vane 24 is low, and it penetrates to the high side on the other side, so as to ensure that part of the liquid can still pass through the heat exchange holes 23 under the action of the fluid filled in the methanol-water-ethylene glycol heat exchanger 2, and further improve the heat exchange efficiency.

[0026] Through the setting of the above structure, when the water-ethylene glycol enters the methanol-water-ethylene glycol heat exchanger 2 along the three-way temperature regulating valve 5, it will move upward from the bottom of the inner cavity of the methanol-water-ethylene glycol heat exchanger 2. At this time, part of the water-ethylene glycol will directly move towards the output end of the methanol-water-ethylene glycol heat exchanger 2 through the gap between the guide vanes 24, while part of the water-ethylene glycol will hit the guide vanes 24. At this time, a blocking effect will be generated at the guide vanes 24, so that the water-ethylene glycol will stagger through each group of heat exchange holes 23 along the guide vanes 24, so as to better exchange heat with the methanol fuel in the heat exchange channel 22. And by using the blocking effect of the guide vanes 24, the flow rate of the water-ethylene glycol in the methanol-water-ethylene glycol heat exchanger 2 is slowed down, the passing time of the water-ethylene glycol in the methanol-water-ethylene glycol heat exchanger 2 is increased, so as to increase the heat exchange time between the water-ethylene glycol and the methanol fuel, make the methanol fuel quickly reach the required temperature for use, and improve the temperature control efficiency.

[0027] Refer to Figure 3 , Figure 4 , wherein, a serpentine heat exchange tube 41 is installed inside the water-ethylene glycol jacket water heat exchanger 4, two ends of the serpentine heat exchange tube 41 are respectively connected to the input port and output port of the jacket water through hoses; telescopic rods 42 are fixedly connected to both sides of the bottom and top of the inner cavity of the water-ethylene glycol jacket water heat exchanger 4, the telescopic of the telescopic rods 42 is fixedly connected with the serpentine heat exchange tube 41, and a return spring 43 is sleeved outside the telescopic rods 42. An expansion valve is arranged at the top input port of the water-ethylene glycol jacket water heat exchanger 4, a force-bearing plate 44 is fixedly connected to the top of the serpentine heat exchange tube 41, and the force-bearing plate 44 is located directly below the output end of the expansion valve.

[0028] With the above structure set, when the water glycol enters the water glycol jacket water heat exchanger 4 along the connecting pipe between the methanol-water glycol heat exchanger 2 and the water glycol jacket water heat exchanger 4, due to the setting of the expansion valve, the water glycol will be compressed. When the opening pressure of the expansion valve is reached, the water glycol with impact force will quickly enter the water glycol jacket water heat exchanger 4 and impact the force-receiving plate 44, causing the overall downward movement of the serpentine heat exchange tube 41. When the above impact force disappears, under the rebound action of multiple groups of return springs 43, the serpentine heat exchange tube 41 will be reset, thereby making the water flow in the serpentine heat exchange tube 41 move, effectively avoiding the precipitation and condensation of impurities in the water flow, improving the fluidity in the serpentine heat exchange tube 41, and ensuring the heat exchange effect of the serpentine heat exchange tube 41 during long-term use.

[0029] Referring to Figures 1 - 5 , in the present invention, before the engine or generator is started, the three-way temperature control valve 5 is adjusted to form a circulating flow channel between the methanol-water glycol heat exchanger 2 and the electric heater 3. At this time, the water glycol pump 1 is turned on to pump the water glycol in the circulating flow channel to flow. When the water glycol passes through the electric heater 3, it will be heated. Then the heated water glycol will enter the methanol-water glycol heat exchanger 2 and exchange heat with the heat exchange plate 21, and the heat in the heat exchange plate 21 will be transferred to the heat exchange channel 22 connected to the methanol fuel to heat the methanol fuel before startup. When the methanol fuel is heated to the required temperature, the engine or generator is started. At this time, the electric heater 3 is turned off, and the three-way temperature control valve 5 is adjusted to form a circulating flow channel between the methanol-water glycol heat exchanger 2 and the water glycol jacket water heat exchanger 4. At this time, the jacket water waste heat is used as a heat source to effectively exchange heat with the water glycol, and then the flowing water glycol exchanges heat with the methanol fuel in the heat exchange channel 22, without increasing additional energy consumption, improving the energy utilization rate, and reducing the ship operation cost.

[0030] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent replacements or changes, shall be covered by the protection scope of the present invention.

Claims

1. A marine methanol single-fuel supply temperature control system, comprising a water-glycol pump (1), a methanol-water-glycol heat exchanger (2), an electric heater (3), a water-glycol cylinder jacket water heat exchanger (4), and a three-way temperature control valve (5), characterized in that, The input end of the water glycol pump (1) is communicated with the output end of the methanol-water glycol heat exchanger (2). The input end of the water glycol pump (1) is respectively communicated with the input ends of the electric heater (3) and the water glycol jacket water heat exchanger (4). The output end of the electric heater (3) is communicated with one side input end of the three-way temperature control valve (5). The output end of the water glycol jacket water heat exchanger (4) is communicated with the other side input end of the three-way temperature control valve (5). The output end of the three-way temperature control valve (5) is communicated with the input end of the methanol-water glycol heat exchanger (2). Among them, an input port and an output port pipeline of methanol fuel are arranged on the side wall of the methanol-water glycol heat exchanger (2). An input port and an output port pipeline of jacket water are arranged on the side wall of the water glycol jacket water heat exchanger (4).

2. The marine methanol single-fuel supply temperature control system according to claim 1, characterized in that, An expansion water tank (6) is arranged on the communication pipeline between the water glycol pump (1) and the methanol-water glycol heat exchanger (2). Among them, the expansion water tank (6) is equipped with a liquid level detection sensor (61) and a water replenishing port (62). When the liquid level in the expansion water tank (6) is too low, it automatically replenishes water or reminds the crew to operate manually. When the liquid level in the expansion water tank (6) is too high, it automatically stops replenishing water or reminds the crew to operate manually. Among them, the expansion water tank (6) is equipped with a combustible gas detector (63). When combustible gas is detected in the expansion water tank (6), it alarms to warn the crew that there may be methanol leakage.

3. A marine methanol single-fuel supply temperature control system according to claim 1, characterized in that, A heat exchange plate (21) is fixedly connected inside the methanol-water glycol heat exchanger (2). A heat exchange channel (22) is opened inside the heat exchange plate (21). Both ends of the heat exchange channel (22) are respectively communicated with the input port and the output port pipeline of methanol fuel. A plurality of groups of heat exchange holes (23) are equidistantly opened on the heat exchange plate (21).

4. A marine methanol single-fuel supply temperature control system according to claim 3, characterized in that, Flow guiding sheets (24) are fixedly connected to both sides of the heat exchange plate (21), and the flow guiding sheets (24) on both sides are arranged staggeredly. The number of the flow guiding sheets (24) matches the number of the heat exchange holes (23), and each group of the flow guiding sheets (24) is located above its corresponding heat exchange hole (23).

5. The temperature control system for marine methanol single fuel supply according to claim 4, characterized in that The end of the flow guiding sheet (24) inclines towards the input end of the methanol-water glycol heat exchanger (2). When the water flow flows along the methanol-water glycol heat exchanger (2), it passes through the heat exchange hole (23) under the blocking action of the flow guiding sheet (24).

6. The marine methanol single-fuel supply temperature control system according to claim 1, characterized in that, A serpentine heat exchange tube (41) is installed inside the water glycol jacket water heat exchanger (4). Both ends of the serpentine heat exchange tube (41) are respectively connected to the input port and the output port pipeline of the jacket water through hoses.

7. The marine methanol single-fuel supply temperature control system according to claim 6, characterized in that Expansion sleeve rods (42) are fixedly connected to both sides of the bottom and the top of the inner cavity of the water glycol jacket water heat exchanger (4). The expansion and contraction of the expansion sleeve rods (42) are fixedly connected to the serpentine heat exchange tube (41). A return spring (43) is sleeved outside the expansion sleeve rods (42). An expansion valve is arranged at the top input port of the water glycol jacket water heat exchanger (4).

8. A marine methanol single-fuel supply temperature control system according to claim 1, characterized in that, A temperature sensor I (7) is provided on the methanol outlet pipeline of the methanol-water-ethylene glycol heat exchanger (2), and a temperature sensor II (71) is provided on the connecting pipeline between the three-way temperature regulating valve (5) and the methanol-water-ethylene glycol heat exchanger (2).

9. A marine methanol single-fuel supply temperature control system according to claim 7, characterized in that The electric heater (3), the temperature sensor I (7) and the temperature sensor II (71) are connected by PLC control, and the heating temperature in the electric heater (3) is 30 - 50 °C.

10. A marine methanol single-fuel supply temperature control system according to claim 1, characterized in that, The heating power of the electric heater (3) is adjusted in the form of thyristor or relay. The electric heater (3) is equipped with overheat protection inside, and temperature sensors are provided at both the inlet and outlet of the electric heater (3).

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