Methanol engine and pneumatic control system thereof

Abstract

The utility model discloses a methanol engine and a pneumatic control system thereof and relates to the technical field of engines. The air control system comprises a supercharger, a throttle valve, an anti-surge valve, an air inlet header pipe and a methanol rail pipe. The throttle valve is communicated with the supercharger through a throttle valve air inlet pipe, a supercharging front air inlet pipe is installed on the supercharger, and the anti-surge valve is communicated between the throttle valve air inlet pipe and the supercharging front air inlet pipe through an anti-surge connecting pipe. The air inlet main pipe is communicated with the throttle valve and is communicated with the air cylinder through the air inlet manifold; the methanol rail pipe is communicated with an external methanol supply skid-mounted device, the methanol rail pipe is a normally-opened double-layer pipe, an inner pipe of the methanol rail pipe is a methanol branch pipe, an outer pipe of the methanol rail pipe is an air branch pipe, and the methanol branch pipe is communicated with an air inlet manifold through a methanol sprayer. All-working-condition anti-surge control can be achieved, the reliability of the supercharger is improved, the engine maintenance space is enlarged, and the construction difficulty is reduced. Meanwhile, the utility model discloses a methanol engine.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine especially relates to a methanol engine and its gas control system. BACKGROUND

[0002] At the moment when the research and development process of methanol engine is gradually deepened, it exposes many problems to be solved in the real ship application scene.

[0003] Firstly, the step of setting FVT valve box near the engine has significant disadvantages. FVT valve box is the unit of fuel valve, which is essentially an airtight place or valve box, and integrates various valves for controlling and adjusting the fuel supply of the engine. From the actual application, this setting seriously compresses the maintenance space. When the engine and related equipment need to be maintained, the space occupied by the FVT valve box makes it very inconvenient for the maintenance personnel to operate, increasing the maintenance difficulty and time cost. Moreover, the arrangement of FVT valve box in the limited space of ship engine room is tricky. The engine room itself has many devices and the space layout is compact. The addition of FVT valve box further aggravates the space tension. Furthermore, the integration of many related valves and accessories into FVT valve box undoubtedly greatly increases the cost investment. At the same time, the double-wall management construction becomes complex and cumbersome because of the existence of FVT valve box. From pipe selection, installation technology to later maintenance, each link faces higher requirements and challenges.

[0004] Secondly, during the port stay, the ship is frequently in the state of disengagement and discharge. At this time, the engine operating condition is complex and changeable, which is easy to cause the surge problem of the supercharger. In addition, when the load is suddenly unloaded, the working state of the engine changes instantaneously, and the supercharger also frequently encounters the surge phenomenon. The surge of the supercharger not only reduces the performance of the engine and affects the stability of the ship power output, but also causes irreversible damage to the supercharger and related parts in the long run, shortens the service life of the equipment, increases the overall cost and safety risk of ship operation, and seriously restricts the promotion and development of methanol engine in real ship application. CONTENT OF THE UTILITY MODEL

[0005] Therefore, the technical problem to be solved by the utility model is to provide a methanol engine and its gas control system, which can realize full-condition anti-surge control, improve the reliability of the supercharger, increase the engine maintenance space, reduce the construction difficulty, realize the interlocking control of the pressure and temperature monitoring in the crankcase and the inert gas purging, and improve the maintenance convenience and safety.

[0006] To solve the above technical problems, the technical scheme of the utility model is:

[0007] A gas control system of a methanol engine, comprising a supercharger, a throttle valve, an anti-surge valve, an air intake manifold and a methanol rail pipe.

[0008] The throttle valve is connected to the turbocharger through the throttle valve intake pipe. The turbocharger is equipped with a turbocharger intake pipe. The anti-surge valve is connected between the throttle valve intake pipe and the turbocharger intake pipe through an anti-surge connecting pipe.

[0009] The intake manifold is connected to the throttle valve, and the intake manifold is connected to the cylinder through the intake manifold;

[0010] The methanol rail is connected to the external methanol supply skid. The methanol rail is a normally open double-layered pipe. The inner pipe of the methanol rail is a methanol branch pipe, and the outer pipe of the methanol rail is an air branch pipe. The methanol branch pipe is connected to the intake manifold through a methanol injector.

[0011] The booster is used to pressurize the air, the throttle valve is used to control the airflow, the anti-surge valve is used to control the conduction state of the anti-surge connecting pipe, and the methanol rail pipe is used to simultaneously transport methanol and ventilation air.

[0012] Preferably, an intercooler is installed on the throttle intake pipe, and one end of the anti-surge connecting pipe is installed between the throttle and the intercooler.

[0013] Preferably, an air filter is installed on the booster intake pipe, and the other end of the anti-surge connecting pipe is installed between the air filter and the booster.

[0014] Preferably, the cylinder is connected to the turbocharger via an exhaust pipe.

[0015] Preferably, the number of the alcohol injector, the intake manifold, and the cylinder corresponds one-to-one.

[0016] A methanol engine, wherein the aforementioned gas control system is installed on the methanol engine.

[0017] Preferably, the methanol engine includes a crankcase, on which an inert gas purging structure is installed for purging the internal oil and gas vapors.

[0018] Preferably, the inert gas purging structure includes a crankcase pressure and temperature sensor, an inert gas purging interface, and a vent.

[0019] The crankcase pressure and temperature sensor is used to detect the pressure and temperature inside the crankcase.

[0020] The inert gas purging port is connected to an external inert gas generator, and the vent is used to discharge the inert gas and the oil vapor it carries.

[0021] Preferably, the crankcase includes a cover plate, and the inert gas purging port and the vent are both installed on the cover plate.

[0022] Preferably, the inert gas entering the crankcase through the inert gas purging port is nitrogen.

[0023] After adopting the above technical solution, the beneficial effects of this utility model are:

[0024] A gas control system for a methanol engine includes a turbocharger, a throttle valve, an anti-surge valve, an intake manifold, and a methanol rail. The throttle valve is connected to the turbocharger via a throttle intake pipe. A booster intake pipe is installed on the turbocharger. The anti-surge valve is connected between the throttle intake pipe and the booster intake pipe via an anti-surge connecting pipe. By installing the anti-surge valve on both the throttle intake pipe and the booster intake pipe, and controlling it under the engine control system, the system automatically opens the anti-surge valve when the load is suddenly unloaded, allowing excess air to flow back to the booster intake pipe, creating a bypass and preventing surge. The system then promptly closes the anti-surge valve to maintain the air volume required for the current operating condition. This achieves anti-surge control under all operating conditions and improves turbocharger reliability.

[0025] The intake manifold is connected to the throttle valve and to the cylinders via the intake manifold. The methanol rail is connected to the external methanol supply skid. The methanol rail is a normally open double-walled pipe, with the inner pipe being a methanol branch pipe and the outer pipe an air branch pipe. The methanol branch pipe is connected to the intake manifold via an alcohol injector. This application adopts a multi-point injection method, with alcohol injectors arranged on the intake manifolds corresponding to each cylinder. Each cylinder is simultaneously connected to the methanol rail. The methanol rail adopts a double-walled pipe design with normally open inlet and outlet. The inner pipe carries methanol, and the outer pipe carries ventilation air. The engine-side FVT valve box is eliminated, and the methanol rail does not have any valve accessories. The relevant valves are integrated from the engine-side FVT into the methanol supply skid, achieving functional merging. The inlet and outlet of the methanol rail are connected to the methanol inlet and outlet ports of the methanol supply skid via double-walled pipes. When connecting the methanol rail to the methanol supply skid, it is not necessary to distinguish between the inlet and outlet of the methanol rail; either end of the methanol rail can be used as a methanol inlet or outlet, reducing construction difficulty.

[0026] Meanwhile, this application also discloses a methanol engine equipped with a gas control system; the methanol engine includes a crankcase, on which an inert gas purging structure for purging internal oil and gas vapors is installed. The inert gas purging structure includes a crankcase pressure and temperature sensor, an inert gas purging interface, and a vent. The crankcase pressure and temperature sensor is controlled by the engine control system. When the pressure and / or temperature inside the crankcase exceeds a limit value, the engine control system controls the inert gas generator to open a valve, and the inert gas generator purges inert gas into the crankcase, causing it to carry oil and gas vapors out through the vent, thereby improving the safety of methanol engine operation. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the structure of the methanol engine air control system according to Embodiment 1 of this utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the methanol engine in Embodiment 2 of this utility model;

[0030] Figure 3 yes Figure 2 Enlarged view of part A;

[0031] In the picture:

[0032] 1. Turbocharger; 11. Turbocharger intake manifold; 12. Air filter;

[0033] 2. Throttle body; 21. Throttle body intake manifold; 22. Intercooler;

[0034] 3. Anti-surge valve; 31. Anti-surge connecting pipe;

[0035] 4. Intake main pipe; 41. Intake manifold;

[0036] 5. Methanol rail; 51. Methanol injector;

[0037] 6. Cylinder; 61. Exhaust pipe;

[0038] 7. Crankcase; 71. Crankcase pressure and temperature sensor; 72. Inert gas purging port; 73. Vent; 74. Cover plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0040] Example 1

[0041] like Figure 1As shown, this embodiment includes a turbocharger 1, a throttle valve 2, an anti-surge valve 3, an intake manifold 4, and a methanol rail 5. The throttle valve 2 is connected to the turbocharger 1 via a throttle intake pipe 21. A booster intake manifold 11 is installed on the turbocharger 1. The anti-surge valve 3 is connected between the throttle intake manifold 21 and the booster intake manifold 11 via an anti-surge connecting pipe 31. By installing the anti-surge valve 3 on the throttle intake manifold 21 and the booster intake manifold 11, the anti-surge valve 3 is controlled by the engine control system. When the load is suddenly unloaded, the engine control system automatically controls the anti-surge valve 3 to open, allowing excess air to flow back to the booster intake manifold 11, forming a bypass and preventing surge. Subsequently, the anti-surge valve 3 is promptly closed to maintain the air volume required for the current operating condition. Thus, anti-surge control is achieved under all operating conditions, improving the reliability of the turbocharger.

[0042] The load status is detected by the existing relevant engine sensors, and the detection results are collected and analyzed by the engine control system. The engine control system is responsible for controlling the anti-surge valve 3 to perform its actions.

[0043] When the methanol engine is operating, the anti-surge valve 3 is normally closed, and there is no connection between the boost intake pipe 11 and the throttle intake pipe 21. Air is pressurized in the turbocharger 1, enters the turbocharger 1 through the boost intake pipe 11, then enters the throttle valve 2 through the throttle intake pipe 21, and finally enters the cylinder 6 through the intake manifold 4 to power the methanol engine. When the methanol engine is running at high speed and the throttle valve 2 is close, the anti-surge valve 3 opens, connecting the boost intake pipe 11, the throttle intake pipe 21, and the anti-surge connecting pipe 31. Air can then flow from the high-pressure area to the low-pressure area through the anti-surge connecting pipe 31, instead of flowing back and forth between the three areas, achieving pressure balance throughout the pipeline. Due to the pressure balance in the three pipelines, the gas is not excited to produce low-frequency, high-amplitude pressure pulsations and airflow oscillations, thus effectively preventing surge.

[0044] The intake manifold 4 is connected to the throttle valve 2, and the intake manifold 4 is connected to the cylinder 6 via the intake manifold 41. The methanol rail pipe 5 is connected to the external methanol supply skid. The methanol rail pipe 5 is a normally open double-walled pipe. The inner pipe of the methanol rail pipe 5 is a methanol branch pipe, and the outer pipe of the methanol rail pipe 5 is an air branch pipe. The methanol branch pipe is connected to the intake manifold 41 via the methanol injector 51. This application adopts a multi-point injection method. The methanol injector 51 is arranged on the intake manifold 41 corresponding to each cylinder. Each cylinder is simultaneously connected to the methanol rail pipe 5. The methanol rail pipe 5 adopts a double-walled pipe design with normally open inlet and outlet. The inner pipe is for methanol, and the outer pipe is for ventilation air. The engine-side FVT valve box is eliminated. The methanol rail pipe 5 does not have any valve accessories. The relevant valves are integrated from the engine-side FVT into the methanol supply skid (not shown in the figure), realizing the merging of functions. The inlet and outlet of the methanol rail pipe 5 are connected to the methanol inlet and outlet interfaces of the methanol supply skid via double-walled pipes. When connecting methanol rail pipe 5 to the methanol supply skid, it is not necessary to distinguish between the inlet and outlet of the methanol rail pipe. Either end of the methanol rail pipe can be used as a methanol inlet or outlet, which reduces the difficulty of construction.

[0045] The methanol rail 5 is connected to the methanol supply skid via a flange.

[0046] The booster 1 is used to pressurize the air, the throttle valve 2 is used to control the air flow, the anti-surge valve 3 is used to control the conduction state of the anti-surge connecting pipe 31, and the methanol rail pipe 5 is used to simultaneously transport methanol and ventilation air.

[0047] In this embodiment, an intercooler 22 is installed on the throttle intake pipe 21, and one end of the anti-surge connecting pipe 31 is installed between the throttle valve 2 and the intercooler 22. The gas entering the boost intake pipe 11 through the anti-surge valve 3 is intercooled air, which reduces the gas temperature in the boost intake pipe 11 and thus reduces the energy consumption of the intercooler 22.

[0048] An air filter 12 is installed on the booster inlet pipe 11, and the other end of the anti-surge connecting pipe 31 is installed between the air filter 12 and the booster 1. The installation of the air filter 12 can filter the incoming air to meet the usage requirements.

[0049] Cylinder 6 is connected to turbocharger 1 via exhaust pipe 61. The exhaust gas generated by cylinder 6 is used to drive turbocharger 1 to perform work, providing power to turbocharger 1.

[0050] Preferably, the number of methanol injectors 51, intake manifolds 41 and cylinders 6 are in one-to-one correspondence, with each methanol injector 51 corresponding to a separate cylinder 6 for methanol injection.

[0051] In this embodiment, based on load conditions and the engine control system, when the load is suddenly unloaded, the engine control system automatically controls the anti-surge valve 3 to open, allowing excess air to flow back to the turbocharger intake manifold 11, forming a bypass and participating in the intake of the turbocharger 1, thus preventing surge. Simultaneously, the engine-side FVT valve box is eliminated, and the methanol rail pipe 5 has no valve accessories. Related valves are integrated from the engine-side FVT into the methanol supply skid, achieving functional consolidation. The inlet and outlet of the methanol rail pipe 5 are connected to the methanol inlet and return interfaces of the methanol supply skid, respectively. Therefore, full-condition anti-surge control can be achieved, improving turbocharger reliability, increasing engine maintenance space, and reducing construction difficulty.

[0052] Example 2

[0053] like Figure 2 and Figure 3 As shown in the figure, this embodiment discloses a methanol engine, which is equipped with the gas control system described in the above embodiment. The methanol engine includes a crankcase 7, on which an inert gas purging structure for purging internal oil and gas vapors is installed.

[0054] Currently, existing methanol engines typically use oil mist detectors and main bearing temperature sensors to monitor and prevent crankcase explosions. When the oil mist concentration exceeds the limit or the temperature is too high, an alarm is triggered, and the methanol engine reduces torque or shuts down. In short, this approach relies on passive alarms and actions to detect blow-by gas and oil vapor within the crankcase, lacking interlocking active control functions.

[0055] In this embodiment, the inert gas purging structure includes a crankcase pressure and temperature sensor 71, an inert gas purging interface 72, and a vent 73. The crankcase pressure and temperature sensor 71 is used to detect the pressure and temperature inside the crankcase 7, the inert gas purging interface 72 is connected to an external inert gas source, and the vent 73 is used to discharge the inert gas and any oil vapors it carries.

[0056] The crankcase pressure and temperature sensor 71 and the inert gas generator are both controlled by the engine control system. When the pressure and / or temperature in the crankcase 7 exceeds the limit, the engine control system controls the inert gas generator to open the valve. The inert gas generator blows inert gas into the crankcase 7, so that it carries oil vapor and is discharged through the vent 73, which improves the safety of methanol engine operation.

[0057] Preferably, the crankcase 7 includes a cover plate 74, an inert gas purging port 72 and a vent 73, both of which are installed on the cover plate 74; the inert gas entering the crankcase 7 through the inert gas purging port 72 is nitrogen.

[0058] This embodiment can achieve a combination of pressure and temperature monitoring inside the crankcase 7, inert gas purging, and crankcase 7 ventilation control, thereby realizing automatic purging of gas inside the crankshaft and improving maintenance convenience and safety.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas control system for a methanol engine, characterized in that, It includes a turbocharger (1), a throttle valve (2), an anti-surge valve (3), an intake manifold (4), and a methanol rail (5); The throttle valve (2) is connected to the turbocharger (1) through the throttle valve intake pipe (21). The turbocharger (1) is equipped with a booster intake pipe (11). The anti-surge valve (3) is connected between the throttle valve intake pipe (21) and the booster intake pipe (11) through the anti-surge connecting pipe (31). The intake manifold (4) is connected to the throttle valve (2), and the intake manifold (4) is connected to the cylinder (6) through the intake manifold (41); The methanol rail pipe (5) is connected to the external methanol supply skid. The methanol rail pipe (5) is a normally open double-layer pipe. The inner pipe of the methanol rail pipe (5) is a methanol branch pipe, and the outer pipe of the methanol rail pipe (5) is an air branch pipe. The methanol branch pipe is connected to the air intake manifold (41) through the methanol injector (51). The booster (1) is used to pressurize the air, the throttle valve (2) is used to control the air flow, the anti-surge valve (3) is used to control the conduction state of the anti-surge connecting pipe (31), and the methanol rail pipe (5) is used to simultaneously transport methanol and ventilation air.

2. The gas control system for a methanol engine as described in claim 1, characterized in that, An intercooler (22) is installed on the throttle intake pipe (21), and one end of the anti-surge connecting pipe (31) is installed between the throttle (2) and the intercooler (22).

3. The gas control system for a methanol engine as described in claim 2, characterized in that, An air filter (12) is installed on the booster inlet pipe (11), and the other end of the anti-surge connecting pipe (31) is installed between the air filter (12) and the booster (1).

4. The gas control system for a methanol engine as described in claim 1, characterized in that, The cylinder (6) is connected to the turbocharger (1) through the exhaust pipe (61).

5. The gas control system for a methanol engine as described in claim 1, characterized in that, The number of the alcohol injector (51), the intake manifold (41), and the cylinder (6) are in one-to-one correspondence.

6. A methanol engine, characterized in that, The methanol engine is equipped with the gas control system according to any one of claims 1 to 5.

7. The methanol engine as described in claim 6, characterized in that, The methanol engine includes a crankcase (7) and an inert gas purging structure for purging the oil and gas vapor inside the crankcase (7).

8. The methanol engine as described in claim 7, characterized in that, The inert gas purging structure includes a crankcase pressure and temperature sensor (71), an inert gas purging interface (72), and a vent (73); The crankcase pressure and temperature sensor (71) is used to detect the pressure and temperature inside the crankcase (7); The inert gas purging port (72) is connected to the external inert gas generator, and the vent (73) is used to discharge the inert gas and the oil vapor it carries.

9. The methanol engine as described in claim 8, characterized in that, The crankcase (7) includes a cover plate (74), and the inert gas purging port (72) and the vent (73) are both installed on the cover plate (74).

10. The methanol engine as described in claim 8, characterized in that, The inert gas entering the crankcase (7) through the inert gas purging port (72) is nitrogen.

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