A fuel supply system for a methanol engine

Abstract

The utility model discloses a kind of methanol engine fuel supply systems, it is related to methanol engine field, the output of methanol tank is communicated with the input of first hydraulic pump and the input of flow valve respectively, when starting methanol engine, fuel in methanol tank is first delivered to methanol liquid rail after pressurizing by first hydraulic pump, heating module is provided in methanol liquid rail, pressurized methanol is heated up quickly by heating module, methanol fuel is directly delivered to the cylinder of engine after reaching predetermined temperature, and engine is started;In the stage that engine just starts, the mixture of methanol and air in conveying pipeline is pressurized and heated to predetermined condition by electronic supercharger, and the flow of cooling liquid in the condensing end of intercooler is reduced, the cooling capacity of the condensing end of intercooler to the mixture after pressurized and heated is reduced, to ensure that the mixture into the cylinder of engine can be at higher temperature, to maintain the low-speed smooth running of engine starting initial stage.

Description

Technical Field

[0001] This utility model relates to the field of methanol engines, and in particular to a methanol engine fuel supply system. Background Technology

[0002] For nearly a century, fossil fuels have been the primary energy source for human survival. However, the reserves of fossil fuels have been continuously depleted through long-term development and utilization, and the environmental problems caused by their combustion have increasingly drawn attention. Rising oil prices and global warming have become profound issues affecting economic development and environmental protection. With my country's rapid economic development and increasing per capita energy demand, from the perspective of energy substitution and environmental protection, it is urgent to find a renewable and clean energy source.

[0003] Among many alternative fuels, methanol (CH3OH) can be considered a sustainable and widely available energy source. However, as an alternative fuel for engines, methanol also presents some problems in practical applications: methanol has a high latent heat of vaporization, which is 4-5 times that of traditional fuels. During vaporization, methanol lowers the cylinder temperature, leading to unstable combustion in each cylinder. Furthermore, under low-temperature conditions, the low engine temperature can cause the engine to fail to start. Utility Model Content

[0004] The purpose of this invention is to provide a methanol engine fuel supply system to solve the problems existing in the prior art and to address the issue that the engine is difficult to start due to the high latent heat of vaporization of methanol.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a methanol engine fuel supply system, including a methanol tank and an engine; the output port of the methanol tank is connected to the input port of a first hydraulic pump and the input port of a flow valve, respectively;

[0006] The output port of the first hydraulic pump is connected to the methanol rail, which is equipped with a heating module. The output port of the methanol rail is connected to the engine through the feed pipe.

[0007] The output port of the flow valve is connected to the engine through a delivery pipeline. The delivery pipeline is equipped with the condenser end of the electronic supercharger and the intercooler in sequence. The condenser end of the intercooler exchanges heat with the methanol in the delivery pipeline.

[0008] In one embodiment, a second hydraulic pump is provided at the output port of the methanol tank. The output port of the second hydraulic pump is connected to the input port of the first hydraulic pump and the input port of the flow valve, respectively. The output pressure of the second hydraulic pump is less than the output pressure of the first hydraulic pump.

[0009] In one embodiment, the condenser end of the intercooler is connected to the evaporator end of the intercooler on the engine via a circulation pipe, and a coolant flow valve is provided on the circulation pipe.

[0010] In one embodiment, a turbocharger is provided on the engine's exhaust manifold, and the output of the turbocharger is connected to a pipe between an electric supercharger and a flow valve.

[0011] In one embodiment, a filter is provided between the second hydraulic pump and the first hydraulic pump.

[0012] In one embodiment, the feed pipe extends into the interior of the engine, and a nozzle is provided on the portion located inside the engine.

[0013] In one embodiment, an intake manifold is provided between the delivery pipe and the engine.

[0014] In one embodiment, a first temperature sensor is installed inside the methanol tank, a first temperature and pressure sensor is installed in the methanol liquid rail, and a second temperature and pressure sensor is installed on the delivery pipeline.

[0015] The present invention achieves the following technical advantages over the prior art:

[0016] The methanol engine fuel supply system includes a methanol tank and an engine. The output port of the methanol tank is connected to the input port of the first hydraulic pump and the input port of the flow valve. When the methanol engine is started, the fuel in the methanol tank is first pressurized by the first hydraulic pump and then delivered to the methanol rail. The methanol rail is equipped with a heating module. The pressurized methanol is rapidly heated by the heating module. After reaching the predetermined temperature, the methanol rail directly delivers the methanol fuel to the cylinder of the engine and starts the engine.

[0017] During the initial startup phase, the engine operates under low load. The electric supercharger pressurizes and heats the methanol-air mixture, controlling the temperature and pressure of the mixture entering the engine cylinders to meet predetermined conditions. Furthermore, because an intercooler is installed in the delivery pipeline, and the coolant at the intercooler's condenser exchange heat with the mixture in the pipeline, the flow rate of coolant at the intercooler's condenser is reduced during the initial startup phase. This reduces the intercooler's cooling capacity for the pressurized and heated mixture, ensuring that the mixture entering the engine cylinders remains at a relatively high temperature to maintain stable low-speed operation during the initial startup phase. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the methanol engine fuel supply system in one embodiment of the present invention;

[0020] The components include: 1. Engine; 2. Circulation pipeline; 3. Delivery pipeline; 4. Cylinder; 5. Methanol rail; and 6. Feed pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The purpose of this invention is to provide a methanol engine fuel supply system to solve the problems existing in the prior art and to address the difficulty in starting the engine due to the high latent heat of vaporization of methanol.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Please refer to Figure 1 This utility model provides a methanol engine fuel supply system, including a methanol tank and an engine 1. The methanol tank is used to hold methanol fuel for combustion and power generation inside the engine 1. The output port of the methanol tank is connected to the input port of a first hydraulic pump and the input port of a flow valve. The methanol in the methanol tank is delivered to the first hydraulic pump and the flow valve, that is, the methanol discharged from the methanol tank is divided into two pipes and delivered to the cylinder 4 of the engine 1.

[0025] The output port of the first hydraulic pump is connected to the methanol liquid rail 5. After being pressurized by the first hydraulic pump, the methanol enters the methanol liquid rail 5 and is rapidly heated and vaporized by the heating module in the methanol liquid rail 5. After passing through the first hydraulic pump and the heating module, the methanol-air mixture reaches the temperature and pressure required for combustion. The output port of the methanol liquid rail 5 is connected to the engine 1 through the feed pipe 6. After being pressurized and heated by the first hydraulic pump and the heating module, the mixture is directly fed into the cylinder 4 of the engine 1 through the feed pipe 6. The mixture is ignited and burned in the cylinder 4 of the engine 1 to do work and start the engine 1.

[0026] After engine 1 starts, methanol output from the outlet of the flow valve enters cylinder 4 of engine 1 through delivery pipe 3. Delivery pipe 3 is sequentially equipped with an electronic supercharger, the condenser end of the intercooler, and a throttle valve. The methanol-air mixture in delivery pipe 3 experiences pressure increase after being pressurized by the electronic supercharger, causing the mixture's temperature to rise. The throttle valve controls the flow rate of the mixture entering the engine, thereby controlling the engine's output power. The intercooler includes a condenser end and an evaporator end. The evaporator end of the intercooler is located on engine 1 to cool it. The condenser end of the intercooler exchanges heat with the methanol-air mixture in delivery pipe 3. The condenser end and the evaporator end are connected by a circulation pipe 2, which is equipped with a coolant flow valve.

[0027] During the actual operation of engine 1, the engine 1 generates a large amount of heat due to the combustion of fuel in cylinder 4. The intercooler transfers the heat generated by the engine 1 to the condenser end, using the heat generated during the operation of engine 1 to reheat the mixture in the delivery pipe 3. However, at the initial stage of engine 1 startup, the temperature of engine 1 itself is low, and the heat generated by the combustion of fuel in cylinder 4 of engine 1 needs to be used for engine 1 preheating. At this time, engine 1 cannot provide heat to the mixture in delivery pipe 3, and while providing heat to the mixture in delivery pipe 3, it will also lower the temperature inside cylinder 4 of engine 1, which can easily lead to a low temperature inside cylinder 4 of engine 1 during the initial operation, resulting in incomplete combustion of methanol inside cylinder 4. Therefore, in the early stage of engine 1 startup, the flow rate of coolant in the intercooler is controlled by the coolant flow valve, thereby controlling the heat exchange process between the condenser and delivery pipe 3, reducing the cooling capacity of the intercooler to cylinder 4 of engine 1, and ensuring stable operation of engine 1 in the initial stage of startup.

[0028] As engine 1 continues to run, the temperature of engine 1 rises. The intercooler uses the heat generated by engine 1 to further heat the mixture in the delivery pipe 3 after it has been pressurized and heated by the electric supercharger. While cooling engine 1, it reduces the load on the electric supercharger, keeps the mixture at a higher temperature, and ensures that the methanol-air mixture is fully combusted in the air chamber of engine 1.

[0029] A second hydraulic pump is installed at the outlet of the methanol tank. The second hydraulic pump is used to extract methanol from the methanol tank and deliver methanol fuel to the pipeline where the first hydraulic pump and the flow valve are located. The output pressure of the second hydraulic pump is less than the output pressure of the first hydraulic pump.

[0030] After engine 1 reaches a stable operating state, the fuel burns in cylinder 4 of engine 1, generating a large amount of heat and exhaust gas at high temperature and pressure. The exhaust gas is discharged from cylinder 4 of engine 1 through the exhaust manifold on engine 1. A turbocharger is installed on the exhaust manifold. The high temperature and pressure gas discharged from cylinder 4 acts on the turbocharger, driving the turbocharger to work. The turbocharger pressurizes and heats the methanol discharged from the methanol flow valve. During this stage, the electronic supercharger can be turned off, thereby reducing power consumption and extending the service life of the electronic supercharger.

[0031] A filter is installed between the second hydraulic pump and the first hydraulic pump to filter the methanol output by the second hydraulic pump and prevent impurities from entering the methanol liquid rail 5.

[0032] The process of methanol entering cylinder 4 of engine 1 through the first hydraulic pump and methanol rail 5 is a direct injection process. Therefore, the feed pipe 6 at the output end of methanol rail 5 extends into the interior of engine 1, and a nozzle is provided on the part located inside engine 1. The nozzle is used to atomize the mixture of methanol and air entering cylinder 4.

[0033] The number of cylinders 4 in engine 1 is determined according to the actual situation. When multiple cylinders 4 need to be set, an intake manifold is set between the delivery pipe 3 and engine 1. The mixture of methanol and air in the delivery pipe 3 is evenly distributed to each cylinder 4 through the intake manifold to improve the power output of engine 1.

[0034] The methanol tank is equipped with a first temperature sensor, the methanol rail 5 is equipped with a first temperature and pressure sensor, and the delivery pipeline 3 is equipped with a second temperature and pressure sensor.

[0035] The first temperature sensor is located inside the methanol tank to collect the methanol temperature in real time, thereby enabling accurate control of the heating power of the heating module and the flow rate of the methanol flow valve. The first pressure and temperature sensor is located on the methanol rail 5 to provide real-time feedback on the temperature and pressure of the methanol. The methanol rail 5 is equipped with a heating module, and the heating power of the heating module is adjusted by collecting the methanol temperature to achieve a rapid increase in methanol temperature. The second pressure and temperature sensor is located in front of the throttle valve of the intake manifold of engine 1 to provide real-time feedback on the temperature and pressure of the methanol-air mixture. Through the first temperature sensor, the first temperature and pressure sensor, and the second temperature and pressure sensor, the methanol temperature before entering engine 1 is precisely controlled to ensure the normal start-up and stable operation of engine 1.

[0036] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0037] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A methanol engine fuel supply system, characterized in that, It includes a methanol tank and an engine (1); the output port of the methanol tank is connected to the input port of the first hydraulic pump and the input port of the flow valve, respectively; The output port of the first hydraulic pump is connected to the methanol rail (5), the methanol rail (5) is equipped with a heating module, and the output port of the methanol rail (5) is connected to the engine (1) through the feed pipe (6). The output port of the flow valve is connected to the engine (1) through the delivery pipe (3). The delivery pipe (3) is provided with an electronic supercharger and an intercooler condenser in sequence. The condenser of the intercooler exchanges heat with the methanol in the delivery pipe (3).

2. The methanol engine fuel supply system according to claim 1, characterized in that, A second hydraulic pump is installed at the output port of the methanol tank. The output port of the second hydraulic pump is connected to the input port of the first hydraulic pump and the input port of the flow valve, respectively. The output pressure of the second hydraulic pump is less than the output pressure of the first hydraulic pump.

3. The methanol engine fuel supply system according to claim 2, characterized in that, The condenser end of the intercooler is connected to the evaporator end of the intercooler on the engine (1) through a circulation pipe (2), and a coolant flow valve is provided on the circulation pipe (2).

4. The methanol engine fuel supply system according to claim 3, characterized in that, A turbocharger is provided on the exhaust manifold of the engine (1), and the output end of the turbocharger is connected to the pipeline between the electronic supercharger and the flow valve.

5. The methanol engine fuel supply system according to claim 4, characterized in that, A filter is provided between the second hydraulic pump and the first hydraulic pump.

6. The methanol engine fuel supply system according to claim 1, characterized in that, The feed pipe (6) extends into the interior of the engine (1), and a nozzle is provided on the portion located inside the engine (1).

7. The methanol engine fuel supply system according to claim 1, characterized in that, An intake manifold is provided between the delivery pipe (3) and the engine (1).

8. The methanol engine fuel supply system according to claim 1, characterized in that, The methanol tank is equipped with a first temperature sensor, the methanol rail (5) is equipped with a first temperature and pressure sensor, and the delivery pipe (3) is equipped with a second temperature and pressure sensor.

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