Methanol fuel engine preheating system

Abstract

The utility model provides a methanol fuel engine preheating system which comprises a methanol heat exchange system, a fresh water heating system, a seawater input system and a seawater heat exchange system, the methanol heat exchange system is connected with the seawater heat exchange system through a pipeline, the seawater heat exchange system is connected with the fresh water heating system through a pipeline, and the fresh water heating system is connected with the seawater input system through a pipeline. The methanol preheating system is connected with the seawater heat exchange system through a pipeline, the seawater heat exchange system is connected with the seawater input system through a pipeline, and the methanol heat exchange system is provided with two groups of methanol and seawater heat exchangers. Compared with a conventional fresh water system, a machine belt single water pump and an independent heat exchanger are omitted, the whole system is simplified in composition, safe, reliable and high in integration level, the energy-saving effect is achieved, the construction cost is reduced, and it is not needed to consume more extra energy to independently heat methanol fuel.

Description

Technical Field

[0001] The utility model belongs to the technical field of methanol fuel engine preheating, in particular to a methanol fuel engine preheating system. Background Art

[0002] The preheating system for methanol fueled ships refers to a system installed on ships to ensure that the methanol fuel reaches the appropriate temperature. The system usually includes a heater, a temperature sensor, a control unit and other related equipment. The preheating system for methanol fueled ships is designed to ensure the fluidity and combustion performance of the fuel by preheating the methanol fuel when starting the ship's engine, thereby improving the starting efficiency and stability of the engine. The preheating system helps reduce the instability of ship engines at startup and the problem of incomplete fuel combustion, improve the utilization rate of ship fuel and reduce adverse effects on the environment.

[0003] The preheating system requires the use of special equipment and technology to ensure that the methanol fuel reaches the appropriate temperature before the engine is started. These devices are often expensive, increasing the overall construction cost. The complexity and particularity of the preheating system may cause it to require more frequent maintenance and repairs in daily operation, which will increase additional costs. Some preheating systems may consume a lot of energy to keep the methanol fuel at the appropriate temperature, which will increase fuel costs and overall operating costs. Therefore, we hope to design a methanol fuel engine preheating system with a new structure to solve this problem. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a methanol fuel engine preheating system to solve the problems raised in the above-mentioned background technology.

[0005] The utility model is realized by the following technical scheme: a methanol fuel engine preheating system, comprising: a methanol heat exchange system, a fresh water heating system, a seawater input system and a seawater heat exchange system, wherein the methanol heat exchange system is connected to the seawater heat exchange system through a pipeline, the seawater heat exchange system is connected to the fresh water heating system through a pipeline, and the seawater heat exchange system is connected to the seawater input system through a pipeline;

[0006] The methanol heat exchange system is provided with two groups of methanol-seawater heat exchangers, and the fresh water heating system is provided with two groups of electric heaters, and each group of the electric heaters for heating fresh water is connected to a fresh water pump through a pipeline;

[0007] The seawater input system comprises a seawater main pipe and a seawater pump, wherein the seawater main pipe is connected to two seawater pumps via pipelines;

[0008] The seawater heat exchange system comprises a freshwater-seawater heat exchanger and an engine, and the engine is connected to the freshwater-seawater heat exchanger through a pipeline.

[0009] As a preferred embodiment, the seawater main is connected to the three-way valve four through a pipeline, a second temperature control valve, and a fourth temperature control valve; the water inlet ends of the two groups of seawater pumps are connected to the water inlet ends of the pipelines of the temperature control valves through pipelines, a stop valve, and the water outlet ends of the two groups of seawater pumps are connected to the water outlet ends of the pipelines of the temperature control valves through pipelines, a stop valve, and the water outlet ends of the pipelines of the temperature control valves.

[0010] As a preferred embodiment, the three-way valve four is connected to the seawater inlets of the two groups of seawater-fresh water heat exchangers through pipelines, and the water outlets of the two groups of seawater-fresh water heat exchangers are connected to the three-way valve one through pipelines.

[0011] As a preferred embodiment, the fresh water heat exchange chambers of the two groups of seawater-fresh water heat exchangers are connected through pipelines and connecting valves, the water inlet pipes of the fresh water heat exchange chambers of the two groups of seawater-fresh water heat exchangers are connected to the engine through pipelines, and the fresh water inlet of the engine is connected to the three-way valve five through pipelines and thermostats.

[0012] As a preferred embodiment, the three-way valve five is connected to two groups of electric heaters through two groups of pipelines and two groups of stop valves respectively, the two groups of electric heaters are connected to a three-way valve two through pipelines respectively, the three-way valve five is directly connected to two groups of three-way valves two through two groups of pipelines respectively, and the two groups of three-way valves two are connected to a fresh water pump through pipelines respectively.

[0013] As a preferred embodiment, the two groups of fresh water pumps are respectively connected to three-way valve three through a stop valve and a pipeline, and the three-way valve three is respectively connected to the engine fresh water outlet and the fresh water heat exchange chamber outlet through pipelines.

[0014] As a preferred embodiment, the three-way valve 1 is connected to the temperature control valve 1 through a pipeline, the pipeline connected to the temperature control valve 1 extends to the ship's side, the three-way valve 1 is respectively connected to the seawater inlet of a methanol-seawater heat exchanger through two groups of pipelines and two groups of stop valves, and the seawater outlets of the two groups of methanol-seawater heat exchangers are respectively connected to the pipeline at the discharge end of the temperature control valve through a group of pipelines and a group of stop valves.

[0015] After adopting the above technical scheme, the beneficial effects of the utility model are as follows: by setting a methanol preheating system and a seawater heat exchange system, coordinating a fresh water heating system and a seawater input system, in actual use, the seawater main pipe cooperates with a seawater pump to transport the freshwater to the seawater heat exchange cavity of the freshwater seawater heat exchanger. At the same time, the freshwater is transported to the corresponding electric heater through the freshwater pump for heating, and then transported to the inside of the engine through the three-way valve 5 through the thermostat to preheat the engine. The freshwater flowing out of the engine enters the freshwater heat exchange cavity of the freshwater seawater heat exchanger again and exchanges heat with the seawater at a lower temperature. The freshwater after the heat exchange is completed is transported to the electric heater through the freshwater pump again through the circulation pipeline for heating, so as to complete the purpose of circulating heating of the engine and seawater. The seawater after the heat exchange is completed is transported to the methanol seawater heat exchanger through the pipeline, and the methanol fuel in the methanol seawater heat exchanger is heated. The seawater after the heating is directly discharged through the pipeline arranged on the side of the ship;

[0016] After the engine starts running, stop using the electric heater to heat the fresh water, and the rest of the fresh water heating system operates normally. At this time, the temperature of the engine is higher than the temperature of the fresh water, which will heat the fresh water and cool the engine simultaneously. The heated fresh water then enters the freshwater-seawater heat exchanger to heat the continuously input seawater. The lower temperature of the fresh water after the heat exchange helps to recirculate and cool the engine, and the heated seawater preheats the methanol in the methanol-seawater heat exchanger when it reaches the methanol preheating system. Compared with conventional fresh water systems, the engine-driven single water pump and independent heat exchanger are eliminated, and the entire system is simplified, safe and reliable, highly integrated, energy-saving, and reduces construction costs. There is no need to consume more additional energy to heat the methanol fuel separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model 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 only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 The utility model is a schematic diagram of the overall structure of a methanol fuel engine preheating system.

[0019] Figure 2 This is a schematic diagram of another structural scheme of a methanol fuel engine preheating system of the utility model.

[0020] In the figure, 100-methanol preheating system, 110-methanol seawater heat exchanger, 120-three-way valve one, 130-temperature control valve one;

[0021] 200-Fresh water heating system, 210-Electric heater, 220-Three-way valve 2, 230-Fresh water pump, 240-Three-way valve 3;

[0022] 300-seawater input system, 310-seawater main pipe, 320-seawater pump, 330-three-way valve 4, 340-temperature control valve 2;

[0023] 400-seawater heat exchange system, 410-fresh water and seawater heat exchanger, 420-engine, 430-connecting valve, 440-three-way valve V. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1 The utility model provides a technical solution: a methanol fuel engine 420 preheating system, including: a methanol heat exchange system, a fresh water heating system 200, a seawater input system 300 and a seawater heat exchange system 400, the methanol heat exchange system is connected to the seawater heat exchange system 400 through a pipeline, the seawater heat exchange system 400 is connected to the fresh water heating system 200 through a pipeline, and the seawater heat exchange system 400 is connected to the seawater input system 300 through a pipeline;

[0026] The methanol heat exchange system is provided with two sets of methanol-seawater heat exchangers 110, and the fresh water heating system 200 is provided with two sets of electric heaters 210, and each set of electric heaters 210 for heating fresh water is connected to a fresh water pump 230 through a pipeline;

[0027] The seawater input system 300 includes a seawater main pipe 310 and seawater pumps 320, and the seawater main pipe 310 is connected to two seawater pumps 320 through pipelines;

[0028] The seawater heat exchange system 400 includes a freshwater-seawater heat exchanger 410 and an engine 420 , and the engine 420 is connected to the freshwater-seawater heat exchanger 410 via a pipeline.

[0029] See also Figure 1 The seawater main pipe 310 is connected to the three-way valve 4 330 through a pipeline and a second temperature control valve 340. The water inlet ends of the two groups of seawater pumps 320 are connected to the water inlet ends of the pipelines of the temperature control valves through pipelines and stop valves. The water outlet ends of the two groups of seawater pumps 320 are connected to the water outlet ends of the pipelines of the temperature control valves through pipelines and stop valves.

[0030] The three-way valve four 330 is connected to the seawater inlet of the two sets of seawater-fresh water heat exchangers through pipelines, and the water outlets of the two sets of seawater-fresh water heat exchangers are connected to the three-way valve one 120 through pipelines.

[0031] The fresh water heat exchange chambers of the two sets of seawater-fresh water heat exchangers are connected through pipelines and connecting valves 430, the water inlet pipes of the fresh water heat exchange chambers of the two sets of seawater-fresh water heat exchangers are connected to the engine 420 through pipelines, and the fresh water inlet of the engine 420 is connected to the three-way valve 440 through pipelines and thermostats.

[0032] The three-way valve five 440 is connected to two groups of electric heaters 210 through two groups of pipelines and two groups of stop valves respectively. The two groups of electric heaters 210 are connected to a three-way valve two 220 through pipelines respectively. The three-way valve five 440 is directly connected to two groups of three-way valve two 220 through two groups of pipelines respectively. The two groups of three-way valve two 220 are connected to a fresh water pump 230 through pipelines respectively.

[0033] The two groups of fresh water pumps 230 are respectively connected to the three-way valve 240 through a stop valve and a pipeline, and the three-way valve 240 is respectively connected to the fresh water outlet of the engine 420 and the outlet of the fresh water heat exchange chamber through pipelines.

[0034] The three-way valve 120 is connected to the temperature control valve 130 through a pipeline, and the pipeline connected to the temperature control valve 130 extends to the ship's side. The three-way valve 120 is connected to the seawater inlet of a methanol-seawater heat exchanger 110 through two groups of pipelines and two groups of stop valves. The seawater outlets of the two groups of methanol-seawater heat exchangers 110 are connected to the pipeline at the discharge end of the temperature control valve through a group of pipelines and a group of stop valves.

[0035] As the first embodiment of the utility model, in actual use, the seawater main pipe 310 cooperates with the seawater pump 320 to transport the seawater to the seawater heat exchange chamber of the freshwater-seawater heat exchanger. At the same time, the freshwater is transported to the corresponding electric heater 210 through the freshwater pump 230 for heating, and then transported to the inside of the engine 420 through the three-way valve 440 and the thermostat to preheat the engine 420. The freshwater flowing out of the engine 420 enters the freshwater heat exchange chamber of the freshwater-seawater heat exchanger again and exchanges heat with the seawater with a lower temperature. The freshwater after the heat exchange is transported to the electric heater 210 through the freshwater pump 230 again through the circulation pipeline for heating, so as to complete the purpose of circulating heating of the engine 420 and seawater. The seawater after the heat exchange is transported to the methanol-seawater heat exchanger 110 through the pipeline, and the methanol fuel in the methanol-seawater heat exchanger 110 is heated. The seawater after heating is directly discharged through the pipeline set on the ship's side;

[0036] After the engine 420 starts running, the electric heater 210 is stopped from being used to heat the fresh water, and the other components of the fresh water heating system 200 operate normally. At this time, the temperature of the engine 420 is higher than the temperature of the fresh water, which will heat the fresh water and cool the engine 420 simultaneously. The heated fresh water then enters the fresh water-seawater heat exchanger to heat the continuously input seawater. The lower temperature of the fresh water after the heat exchange is helpful for recirculating cooling of the engine 420, and the heated seawater reaches the methanol preheating system 100 to preheat the methanol in the methanol-seawater heat exchanger. Compared with the conventional fresh water system, the single water pump and the independent heat exchanger are eliminated, the whole system composition is simplified, safe and reliable, highly integrated, energy-saving, and reduces the construction cost. There is no need to consume more additional energy to heat the methanol fuel separately.

[0037] See also Figure 2 The utility model provides another technical solution. In actual use, fresh water is transported to the electric heater through a fresh water pump for heating, and is transported to the engine through a pipeline via a thermostat to preheat the engine. After the first heat exchange, the fresh water enters the fresh water and sea water heat exchanger and reaches the methanol / fresh water heat exchanger through a circulation pipeline to preheat the methanol fuel inside. After the second heat exchange, the fresh water enters the electric heater again through the circulation pipeline through the fresh water pump to heat, thereby achieving the purpose of circulating heating of the engine and the methanol fuel.

[0038] After the engine starts running, the electric heater is stopped, and the fresh water still circulates normally. At this time, the fresh water temperature gradually becomes lower than that of the engine, and the engine begins to heat the fresh water, and the fresh water cools the engine. At the same time, seawater is transported to the seawater pump through the seawater main pipe, and then transported to the inside of the fresh water and seawater heat exchanger through the seawater pump. At this time, the fresh water with a higher temperature will heat the low-temperature seawater, thereby cooling the fresh water. The seawater used to cool the fresh water can then be directly discharged from the ship's side through the pipeline. Compared with the traditional structure, the above scheme cancels the independent circulation system (circulating water pump, expansion water tank and electric heater installed in the heat exchanger), and instead uses the circulating liquid in the engine to heat the methanol fuel through the fuel preheating module, which can heat the circulating water and methanol fuel in the engine simultaneously, is easy to operate, and easy to realize intelligent control, reduces repeated equipment configuration, and reduces construction costs.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A methanol fuel engine preheating system, comprising: A methanol preheating system (100), a fresh water heating system (200), a seawater input system (300) and a seawater heat exchange system (400), characterized in that the methanol preheating system (100) is connected to the seawater heat exchange system (400) via a pipeline, the seawater heat exchange system (400) is connected to the fresh water heating system (200) via a pipeline, and the seawater heat exchange system (400) is connected to the seawater input system (300) via a pipeline; The methanol preheating system (100) is provided with two groups of methanol-seawater heat exchangers (110), and the fresh water heating system (200) is provided with two groups of electric heaters (210), and each group of the electric heaters (210) for heating fresh water is connected to a fresh water pump (230) through a pipeline; The seawater input system (300) comprises a seawater main pipe (310) and a seawater pump (320), wherein the seawater main pipe (310) is connected to two seawater pumps (320) via pipelines; The seawater heat exchange system (400) comprises a freshwater-seawater heat exchanger (410) and an engine (420), wherein the engine (420) is connected to the freshwater-seawater heat exchanger (410) via a pipeline.

2. A methanol fuel engine preheating system as claimed in claim 1, characterized in that: The seawater main pipe (310) is connected to the four three-way valve (330) through a pipeline and a second temperature control valve (340); the water inlet ends of the two groups of seawater pumps (320) are connected to the water inlet ends of the pipelines of the temperature control valves through pipelines and stop valves; and the water outlet ends of the two groups of seawater pumps (320) are connected to the water outlet ends of the pipelines of the temperature control valves through pipelines and stop valves.

3. A methanol fuel engine preheating system as claimed in claim 2, characterized in that: The three-way valve four (330) is connected to the seawater inlets of the two groups of seawater-fresh water heat exchangers through pipelines, and the water outlets of the two groups of seawater-fresh water heat exchangers are connected to the three-way valve one (120) through pipelines.

4. A methanol fuel engine preheating system as claimed in claim 3, characterized in that: The fresh water heat exchange chambers of the two groups of seawater-fresh water heat exchangers are connected via pipelines and a connecting valve (430), the water inlet pipes of the fresh water heat exchange chambers of the two groups of seawater-fresh water heat exchangers are connected to the engine (420) via pipelines, and the fresh water inlet of the engine (420) is connected to the three-way valve (440) via pipelines and a thermostat.

5. A methanol fuel engine preheating system as claimed in claim 4, characterized in that: The three-way valve five (440) is connected to two groups of electric heaters (210) through two groups of pipelines and two groups of stop valves respectively, the two groups of electric heaters (210) are connected to a three-way valve two (220) through pipelines respectively, the three-way valve five (440) is directly connected to two groups of three-way valve two (220) through two groups of pipelines respectively, and the two groups of three-way valve two (220) are connected to a fresh water pump (230) through pipelines respectively.

6. A methanol fuel engine preheating system as claimed in claim 5, characterized in that: The two groups of fresh water pumps (230) are respectively connected to the three-way valve (240) through a stop valve and a pipeline, and the three-way valve (240) is respectively connected to the fresh water outlet of the engine (420) and the outlet of the fresh water heat exchange chamber through pipelines.

7. A methanol fuel engine preheating system as claimed in claim 6, characterized in that: The three-way valve (120) is connected to the temperature control valve (130) through a pipeline, and the pipeline connected to the temperature control valve (130) extends to the ship's side. The three-way valve (120) is connected to the seawater inlet of a methanol-seawater heat exchanger (110) through two groups of pipelines and two groups of stop valves respectively, and the seawater outlets of the two groups of methanol-seawater heat exchangers (110) are connected to the pipeline at the discharge end of the temperature control valve through a group of pipelines and a group of stop valves respectively.

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