Control system for cold start of a marine methanol engine

Abstract

The utility model relates to the technical field of methanol engine, specifically disclose a control system for marine methanol engine cold start, including engine system, the top of one side of engine system is fixed with intercooler, the top of the other side of engine system is fixed with fresh water cooler and expansion water tank, and the top of expansion water tank is connected in fresh water cooler, and the bottom of fresh water cooler is connected with sea water circulation system, and sea water circulation system is connected with sea water pump, and the bottom of intercooler is equipped with water inlet no.

Description

Technical Field

[0001] This utility model relates to the field of methanol engine technology, and specifically discloses a control system for cold start of marine methanol engines. Background Technology

[0002] Marine methanol engines are marine power units that use methanol as the main fuel. They work by generating kinetic energy through the combustion of methanol to propel the ship. They are widely used in commercial ship power systems, bulk carriers, and inland waterway and intelligent ships. However, marine methanol engines may encounter difficulties in cold starting when sailing on routes with normal or low temperatures.

[0003] The main reason for the difficulty in cold-starting marine methanol engines is the high latent heat of vaporization of methanol. The cold-start performance of methanol should be improved by increasing the amount of methanol evaporated at low temperatures. However, methanol is a pure substance, and its evaporation rate cannot be increased by increasing the amount of methanol injected. Under cold-start conditions, the amount of methanol evaporated is lower than the required amount, resulting in a combustible mixture concentration that does not reach the ignition limit, thus making it difficult for the methanol engine to start at low temperatures. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a control system for cold start of marine methanol engine, which solves the problem of difficult cold start of methanol engine when the ambient temperature is too low, and also solves the problem of poor injection atomization effect of methanol engine in low temperature environment, improves the combustion efficiency of methanol in cylinder, and thus improves engine performance.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] The control system for cold starting a marine methanol engine includes an engine system. An intercooler is fixedly installed on the top of one side of the engine system, and a freshwater cooler and an expansion tank are fixedly installed on the top of the other side of the engine system. The expansion tank is connected to the top of the freshwater cooler. A seawater circulation system is connected to the bottom of the freshwater cooler, and a seawater pump is connected to the seawater circulation system. An inlet and an outlet are spaced apart at the bottom of the intercooler. An inlet and an outlet are respectively opened on both sides of the bottom of the freshwater cooler. The outlet is connected to the inlet and the expansion tank through a return water main. The inlet passes through the engine system and is connected to a preheating system through an inlet pipe. The preheating system is connected to the freshwater cooler.

[0007] Furthermore, outlet 2 is connected to outlet pipe 1, and a freshwater pump is installed on outlet pipe 1. The end of outlet pipe 1 away from the freshwater cooler is connected to the end of inlet pipe 1 away from inlet 1.

[0008] Furthermore, the preheating system includes an outlet pipe 2 connected to the end of outlet pipe 1 away from the freshwater cooler, the end of outlet pipe 2 away from outlet pipe 1 connected to inlet pipe 1, and a circulating water preheater is installed on outlet pipe 2.

[0009] Furthermore, a solenoid valve is installed on the outlet pipe 2, and a solenoid valve is installed on the inlet pipe 1 located between the two ends of the outlet pipe 2. A control unit 1 is linked between the circulating water preheater, solenoid valve 1 and solenoid valve 2. An ignition switch and an intercooler air temperature sensor 1 are installed at intervals on one side of the control unit 1.

[0010] Furthermore, the seawater circulation system includes a second inlet pipe located at the bottom of the freshwater cooler, with the end of the second inlet pipe away from the freshwater cooler passing through the engine system and connected to the seawater pump.

[0011] Furthermore, the bottom of the freshwater cooler is provided with an inlet three and an outlet three spaced apart. The end of the inlet pipe two away from the seawater pump passes through the inlet three into the freshwater cooler and then passes through the outlet three to extend to the outside of the freshwater cooler.

[0012] Furthermore, a branch pipe is connected to the second water inlet pipe. One end of the branch pipe is connected to the second water inlet pipe between the engine system and the freshwater cooler, and the other end of the branch pipe is connected to the second water inlet pipe extending to the outside of the freshwater cooler.

[0013] Furthermore, a solenoid valve three is installed on the water inlet pipe two between the end of the branch pipe near the engine system and the water inlet three, and a solenoid valve four is installed on the branch pipe. A control unit two is linked between the solenoid valve three and the solenoid valve four, and an intercooler air temperature sensor two is installed on one side of the control unit two.

[0014] Furthermore, a water inlet pipe 3 is connected to the water inlet pipe 1 located in the engine system, and a water outlet 4 is opened on the side of the engine system near the intercooler. The end of the water inlet pipe 3 away from the water inlet pipe 1 passes through the water outlet 4 and extends to the outside of the engine system.

[0015] Furthermore, the water inlet pipe is connected at intervals to several return water branch pipes, all of which pass through the top of the engine system and are connected to the main return water pipe.

[0016] The beneficial effects of this utility model are:

[0017] This invention solves the problem of difficult cold start ignition of methanol engines when the ambient temperature is too low by setting up a seawater circulation system and a preheating system, and by adjusting the temperature of the engine intake system to control the temperature of the methanol mixture entering the combustion chamber. This improves the combustion efficiency of methanol in the cylinder and thus improves the engine performance. This invention requires minimal modification to the original engine system and can use the heat generated by the engine to heat the methanol, which is energy-saving and environmentally friendly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1. Engine system; 2. Intercooler; 3. Freshwater cooler; 4. Main return water pipe; 5. Seawater pump; 6. Inlet pipe 1; 7. Outlet pipe 1; 8. Freshwater pump; 9. Outlet pipe 2; 10. Circulating water preheater; 11. Solenoid valve 1; 12. Solenoid valve 2; 13. Control unit 1; 14. Ignition switch; 15. Intercooler rear air temperature sensor 1; 16. Inlet pipe 2; 17. Branch pipe; 18. Solenoid valve 3; 19. Solenoid valve 4; 20. Control unit 2; 21. Intercooler rear air temperature sensor 2; 22. Inlet pipe 3; 23. Outlet 4; 24. Return water branch pipe; 25. Expansion tank. Detailed Implementation

[0020] The present invention will now be described and explained in detail with reference to the accompanying drawings.

[0021] Example 1

[0022] like Figure 1 As shown, the control system for cold starting a marine methanol engine includes an engine system 1. The engine system 1 is characterized by having an intercooler 2 fixedly mounted on the top of one side, and a freshwater cooler 3 and an expansion tank 25 fixedly mounted on the top of the other side. The expansion tank 25 is connected to the top of the freshwater cooler 3. The bottom of the freshwater cooler 3 is connected to a seawater circulation system, which is connected to a seawater pump 5. The bottom of the intercooler 2 has an inlet and an outlet spaced apart. The bottom of the freshwater cooler 3 has a second inlet and an outlet on each side. The outlet is connected to the second inlet and the expansion tank 25 via a return water main 4. The inlet passes through the engine system 1 via an inlet pipe 6 and is connected to a preheating system, which is also connected to the freshwater cooler 3.

[0023] The bottom of the freshwater cooler 3 is connected to a seawater circulation system, which is connected to a seawater pump 5. The seawater pump 5 can pump low-temperature seawater into the freshwater cooler 3, thereby cooling the freshwater in the freshwater cooler 3. By setting a preheating system, when the air temperature after the intercooler 2 is lower than the set temperature threshold, the circulating water can be heated to increase the engine water temperature. The engine water temperature is used to increase the air temperature after the intercooler 2, so that it reaches the ignition condition.

[0024] The outlet 2 is connected to the outlet pipe 1 7, and a fresh water pump 8 is installed on the outlet pipe 1 7. The end of the outlet pipe 1 7 away from the fresh water cooler 3 is connected to the end of the inlet pipe 1 6 away from the inlet 1.

[0025] The preheating system includes a second outlet pipe 9 connected to the end of the first outlet pipe 7 away from the freshwater cooler 3, and the end of the second outlet pipe 9 away from the first outlet pipe 7 connected to the first inlet pipe 6. A circulating water preheater 10 is installed on the second outlet pipe 9. By installing the circulating water preheater 10, the circulating water can be heated, thereby increasing the engine water temperature.

[0026] A solenoid valve 11 is installed on the outlet pipe 29, and a solenoid valve 12 is installed on the inlet pipe 6 located between the two ends of the outlet pipe 29. A control unit 13 is linked between the circulating water preheater 10, solenoid valve 11, and solenoid valve 12. An ignition switch 14 and an intercooler air temperature sensor 15 are installed on one side of the control unit 13. The circulating water preheater 10, solenoid valve 11, solenoid valve 12, and control unit 13 are linked. The intercooler air temperature sensor 15 can transmit a signal to the control unit 13 based on the air temperature after the intercooler 2. The control unit 13 can control the opening and closing of solenoid valve 11 and solenoid valve 12.

[0027] The seawater circulation system includes a second water inlet pipe 16 located at the bottom of the freshwater cooler 3. The end of the second water inlet pipe 16 away from the freshwater cooler 3 passes through the engine system 1 and is connected to the seawater pump 5.

[0028] The bottom of the freshwater cooler 3 is provided with an inlet 3 and an outlet 3 spaced apart. The end of the inlet pipe 2 16 away from the seawater pump 5 passes through the inlet 3 into the freshwater cooler 3 and then passes through the outlet 3 to extend to the outside of the freshwater cooler 3. By setting the seawater pump 5, low-temperature seawater can be pumped through the engine system 1 into the freshwater cooler 3 to cool the engine oil in the engine system 1 and the freshwater in the freshwater cooler 3.

[0029] A branch pipe 17 is connected to the second water inlet pipe 16. One end of the branch pipe 17 is connected to the second water inlet pipe 16 between the engine system 1 and the freshwater cooler 3, and the other end of the branch pipe 17 is connected to the second water inlet pipe 16 extending to the outside of the freshwater cooler 3.

[0030] A solenoid valve 18 is installed on the water inlet pipe 16 between the end of branch pipe 17 near engine system 1 and water inlet 3. A solenoid valve 19 is installed on branch pipe 17. A control unit 20 is linked between solenoid valves 18 and 19. An intercooler air temperature sensor 21 is installed on one side of control unit 20. Solenoid valves 18 and 19 are linked with control unit 20. The intercooler air temperature sensor 21 can transmit a signal to control unit 20 based on the air temperature after intercooler 2. Control unit 20 can control the opening and closing of solenoid valves 18 and 19.

[0031] A water inlet pipe 6 located in the engine system 1 is connected to a water inlet pipe 22. A water outlet 23 is provided on the side of the engine system 1 near the intercooler 2. The end of the water inlet pipe 22 away from the water inlet pipe 6 passes through the water outlet 23 and extends to the outside of the engine system 1.

[0032] Several return water branch pipes 24 are connected at intervals on the water inlet pipe 3 22. All the return water branch pipes 24 pass through the top of the engine system 1 and are connected to the return water main pipe 4.

[0033] Working principle and process:

[0034] When a marine methanol engine starts under excessively low ambient temperatures, if the air temperature after intercooler 2 is lower than the set temperature threshold, the intercooler air temperature sensor 15 transmits a signal to control unit 13. Control unit 13 then controls the opening of solenoid valve 11 and the closing of solenoid valve 12, activating the circulating water preheater 10 to heat the circulating water and raise the engine coolant temperature. This engine coolant temperature is then used to raise the air temperature after intercooler 2. When the air temperature after intercooler 2 reaches the set threshold, control unit 13 simultaneously closes solenoid valve 11 and opens solenoid valve 12, while the circulating water preheater 10 stops operating and indicates that the engine has reached ignition conditions. If the air temperature after intercooler 2 is suitable for starting the marine methanol engine, the circulating water preheater... Heater 10 will not start; after the engine starts, the engine freshwater is used to heat the air temperature after the intercooler 2, thereby increasing the temperature of the methanol mixture entering the engine combustion chamber. If the freshwater temperature is higher than the set threshold, the intercooler air temperature sensor 21 will transmit a signal to the control unit 20. The control unit 20 will control the opening of solenoid valve 3 18 and the closing of solenoid valve 4 19. Low-temperature seawater will enter the freshwater cooler 3 through the water inlet pipe 2 16 to cool the freshwater. If the freshwater temperature is lower than the set threshold, the control unit 20 will control the closing of solenoid valve 3 18 and the opening of solenoid valve 4 19. The low-temperature seawater will be discharged directly to the outside through the water inlet pipe 2 16 and the branch pipe 17, only cooling the engine oil in the engine system 1, and not cooling the freshwater.

Claims

1. A control system for cold starting a marine methanol engine, comprising an engine system (1), characterized in that, An intercooler (2) is fixedly installed on the top of one side of the engine system (1), and a freshwater cooler (3) and an expansion tank (25) are fixedly installed on the top of the other side of the engine system (1). The expansion tank (25) is connected to the top of the freshwater cooler (3). The bottom of the freshwater cooler (3) is connected to a seawater circulation system. The seawater circulation system is connected to a seawater pump (5). The bottom of the intercooler (2) is provided with an inlet and an outlet. The bottom of the freshwater cooler (3) is provided with an inlet and an outlet on both sides respectively. The outlet is connected to the inlet and the expansion tank (25) through the return water main pipe (4). The inlet passes through the engine system (1) through the inlet pipe (6) and is connected to the preheating system. The preheating system is connected to the freshwater cooler (3).

2. The control system for cold starting a marine methanol engine according to claim 1, characterized in that, The outlet 2 is connected to the outlet pipe 1 (7), and a fresh water pump (8) is installed on the outlet pipe 1 (7). The end of the outlet pipe 1 (7) away from the fresh water cooler (3) is connected to the end of the inlet pipe 1 (6) away from the inlet 1.

3. The control system for cold starting a marine methanol engine according to claim 2, characterized in that, The preheating system includes a second outlet pipe (9) connected to the end of the first outlet pipe (7) away from the fresh water cooler (3), the end of the second outlet pipe (9) away from the first outlet pipe (7) connected to the first inlet pipe (6), and a circulating water preheater (10) is installed on the second outlet pipe (9).

4. The control system for cold starting a marine methanol engine according to claim 3, characterized in that, A solenoid valve 1 (11) is installed on the outlet pipe 2 (9), and a solenoid valve 2 (12) is installed on the inlet pipe 1 (6) located between the two ends of the outlet pipe 2 (9). A control unit 1 (13) is connected in linkage between the circulating water preheater (10), the solenoid valve 1 (11) and the solenoid valve 2 (12). An ignition switch (14) and an intercooler air temperature sensor 1 (15) are installed on one side of the control unit 1 (13) at intervals.

5. The control system for cold starting a marine methanol engine according to claim 1, characterized in that, The seawater circulation system includes a second water inlet pipe (16) located at the bottom of the freshwater cooler (3). The end of the second water inlet pipe (16) away from the freshwater cooler (3) passes through the engine system (1) and is connected to the seawater pump (5).

6. The control system for cold starting a marine methanol engine according to claim 5, characterized in that, The bottom of the freshwater cooler (3) is provided with an inlet three and an outlet three. The end of the inlet pipe two (16) away from the seawater pump (5) passes through the inlet three into the freshwater cooler (3) and then passes through the outlet three to extend to the outside of the freshwater cooler (3).

7. The control system for cold starting a marine methanol engine according to claim 6, characterized in that, A branch pipe (17) is connected to the second water inlet pipe (16). One end of the branch pipe (17) is connected to the second water inlet pipe (16) between the engine system (1) and the fresh water cooler (3), and the other end of the branch pipe (17) is connected to the second water inlet pipe (16) extending to the outside of the fresh water cooler (3).

8. The control system for cold starting a marine methanol engine according to claim 7, characterized in that, A solenoid valve three (18) is installed on the water inlet pipe two (16) between the end of the branch pipe (17) near the engine system (1) and the water inlet three. A solenoid valve four (19) is installed on the branch pipe (17). A control unit two (20) is linked between the solenoid valve three (18) and the solenoid valve four (19). A second intercooler air temperature sensor two (21) is installed on one side of the control unit two (20).

9. The control system for cold starting a marine methanol engine according to claim 1, characterized in that, A water inlet pipe 3 (22) is connected to a water inlet pipe 1 (6) located in the engine system (1). A water outlet 4 (23) is opened on the side of the engine system (1) near the intercooler (2). The end of the water inlet pipe 3 (22) away from the water inlet pipe 1 (6) passes through the water outlet 4 (23) and extends to the outside of the engine system (1).

10. The control system for cold starting a marine methanol engine according to claim 9, characterized in that, Several return water branch pipes (24) are connected at intervals on the water inlet pipe (22). All the return water branch pipes (24) pass through the top of the engine system (1) and are connected to the return water main pipe (4).

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