Flash boiling injection type methanol heating method and system for pure methanol engine

Abstract

The invention discloses a flash boiling injection type methanol heating method and system for a pure methanol engine, and relates to the technical field of pure methanol engines, and the method comprises the following steps: in the process of supplying methanol to the interior of the engine, pressurizing the methanol to enable the methanol to reach target pressure intensity; performing secondary heating on the methanol to enable the temperature of the methanol to reach a second temperature value; the second temperature value is greater than the first boiling point of the methanol under normal pressure, and the second temperature value is less than the second boiling point of the methanol under the target pressure. The system comprises a first-stage heating mechanism and a second-stage heating mechanism which are sequentially arranged in the supply direction of methanol. According to the flash boiling injection type methanol heating method and system for the pure methanol engine, methanol is pressurized and heated, so that the methanol can be instantly gasified when being ejected from the nozzle, and the problems that the pure methanol engine is difficult to start at low temperature and the performance is difficult to improve are solved.

Description

Technical Field

[0001] The invention relates to the field of methanol engines, in particular to a flash boiling injection type methanol heating method and system for pure methanol engines. Background Art

[0002] Compared with traditional fossil energy, methanol has the advantages of efficient combustion, clean emissions, and renewable energy. It is liquid at room temperature and pressure, easy to store, safe and convenient to use. Therefore, power systems using pure methanol as fuel have gradually become a new hot spot. However, internal combustion engines using methanol as fuel also have shortcomings, mainly because methanol is difficult to evaporate, which leads to difficulties in cold starting at low temperatures and difficulty in improving engine performance. The specific reasons are as follows: 1. The calorific value of methanol is only half of that of gasoline and diesel. To produce the same power, twice as much methanol needs to be injected and burned. The larger the amount of methanol injected, the more difficult it is to evaporate and atomize. 2. The theoretical air-fuel ratio for the complete reaction of air and methanol is about 6.47, while the theoretical air-fuel ratio of gasoline is about 14.5, which means that when both are in a state of complete reaction, when the amount of air is the same, the injection amount of methanol is much greater than that of gasoline, which increases the difficulty of methanol evaporation; 3. The vaporization latent heat of methanol is about three times that of gasoline. To evaporate the same mass of methanol, more heat needs to be absorbed. In addition, under the same theoretical air-fuel ratio, the amount of air corresponding to methanol is less than that of gasoline and diesel, which makes it more difficult for methanol to absorb enough heat from the air when evaporating, further increasing the difficulty of methanol evaporation and atomization. 4. Gasoline is a mixture with a boiling point of 30~190℃. Therefore, some components of gasoline can evaporate directly at normal temperature and pressure. However, the boiling point of methanol at normal pressure is 64.5℃, and its natural evaporation is slow. This also makes it more difficult for methanol to evaporate than gasoline. 5. Methanol is corrosive to a certain extent, and when the nozzle is open, methanol will produce local vaporization, which will lead to cavitation and dry friction, and ultimately accelerate the wear rate of the nozzle.

[0003] Based on the above reasons, technical means are needed to accelerate the evaporation rate of methanol and improve the adequacy of methanol evaporation and fragmentation, so that methanol can be burned smoothly in gaseous form. In the prior art, the methods used are mainly the following: 1. Use methanol-gasoline dual fuel or methanol-diesel dual fuel, burn gasoline or diesel during low-temperature cold start, and then ignite methanol during subsequent high-load operation. The biggest problem with this method is that it requires carrying two sets of fuel supply systems, which is not only costly, but also inconvenient for users to use. At the same time, the combustion of gasoline and diesel will still bring high carbon emissions and other emissions; 2. Using large-capacity batteries to heat the engine cooling water through electric heating, but it takes at least half an hour to heat to normal start, and the energy consumption is huge, which is not suitable for commercialization; 3. Methanol burners are used to burn methanol to heat engine cooling water, but it takes at least half an hour to heat to normal start, which also has the problem of huge energy consumption and is not suitable for commercialization; 4. Increase the injection pressure of methanol or use compression ignition for combustion. The biggest problem with this method is that the nozzle reliability is very poor. The main reason is that the viscosity of methanol is much lower than that of diesel. If the injection pressure of methanol is increased to a level close to that of a diesel engine, it will lead to poor lubrication of the nozzle parts and wear. Although this problem can be improved by adding some lipid additives, it is difficult to industrialize in the short term from the perspective of fuel preparation and supply chain.

[0004] In summary, the existing technologies generally have the problems of high cost and difficulty in commercialization when achieving sufficient evaporation of methanol to solve the problems of low-temperature cold start and performance improvement of pure methanol engines. Summary of the invention

[0005] In order to address the deficiencies in the prior art, the present invention provides a flash-boiling injection methanol heating method and system for a pure methanol engine. By pressurizing and heating methanol, methanol can be instantly vaporized when sprayed from a nozzle, thereby addressing the problems of low-temperature cold starting difficulties and performance improvement difficulties of the pure methanol engine.

[0006] In order to achieve the above object, the specific scheme adopted by the present invention is: a flash boiling injection type methanol heating method for a pure methanol engine, comprising the following steps: In the process of supplying methanol to the engine, the methanol is pressurized so that the methanol reaches a target pressure; Performing secondary heating on the methanol so that the temperature of the methanol reaches a second temperature value; The second temperature value is greater than a first boiling point of methanol at normal pressure, and the second temperature value is less than a second boiling point of methanol at the target pressure.

[0007] As a further optimization of the above-mentioned flash-boiling injection methanol heating method for a pure methanol engine: after the methanol reaches the target pressure, the methanol is heated once so that the temperature of the methanol reaches a first temperature value, and when the methanol approaches the nozzle, the methanol is heated twice so that the temperature of the methanol reaches a second temperature value, and the first temperature value is less than the second temperature value.

[0008] As a further optimization of the above-mentioned flash boiling injection type methanol heating method for a pure methanol engine: the method for primary heating of methanol includes: Obtain a heating medium, and the temperature of the heating medium is higher than the current ambient temperature; delivering the heating medium to the peripheral side of the methanol supply pipeline; The methanol supply line absorbs heat from the heating medium and transfers it to the methanol inside.

[0009] As a further optimization of the above-mentioned flash boiling injection methanol heating method for a pure methanol engine: after the heating medium completes the first-stage heating, it is transported to the engine side and the heating medium is heated up by utilizing the engine waste heat.

[0010] As a further optimization of the above-mentioned flash boiling injection type methanol heating method for a pure methanol engine: the method for secondary heating of methanol includes: supplying power to an electric heater disposed on the methanol supply pipeline until the temperature of the electric heater is higher than a second temperature value; The methanol supply line takes heat from the electric heater and transfers it to the methanol inside.

[0011] As a further optimization of the above-mentioned flash boiling injection methanol heating method for a pure methanol engine: the second temperature value is 75°C~120°C.

[0012] A flash boiling injection type methanol heating system for a pure methanol engine is used to implement the above-mentioned flash boiling injection type methanol heating method for a pure methanol engine, and the system comprises: A primary heating mechanism and a secondary heating mechanism are sequentially arranged along the supply direction of methanol, wherein the primary heating mechanism is used to perform primary heating on the methanol so that the temperature of the methanol reaches a first temperature value, and the secondary heating mechanism is used to perform secondary heating on the methanol so that the temperature of the methanol reaches a second temperature value.

[0013] As a further optimization of the above-mentioned flash boiling injection type methanol heating system for a pure methanol engine: the first-level heating mechanism includes a heat exchange tube sleeved on the methanol supply pipeline, and a distance is left between the heat exchange tube and the methanol supply pipeline to form a heat exchange space for the heating medium to pass through.

[0014] As a further optimization of the above-mentioned flash boiling injection type methanol heating system for a pure methanol engine: the secondary heating mechanism includes at least one heat conductive block fixedly attached to the methanol supply pipeline, the heat conductive block is provided with a cavity, and a heating element is fixedly arranged in the cavity.

[0015] As a further optimization of the above-mentioned flash boiling injection type methanol heating system for a pure methanol engine: the system also includes a controller connected to the primary heating mechanism and the secondary heating mechanism, and the controller is also connected to a pressure sensor for collecting the current pressure of methanol and a temperature sensor for collecting the temperature when methanol is sprayed.

[0016] Beneficial effects: The present invention first pressurizes methanol until the methanol reaches the target pressure, so that the boiling point of the methanol gradually rises from the first boiling point to the second boiling point, and then heats the methanol until the methanol reaches the second temperature value, so that the temperature of the methanol is increased but does not reach the second boiling point, thereby avoiding direct gasification of the methanol in the methanol supply pipeline, and achieving the effect of transporting the methanol in a high-pressure and high-temperature state; when the high-pressure and high-temperature methanol is sprayed out from the nozzle, its pressure is instantly reduced to normal pressure, and the corresponding boiling point is also instantly reduced from the second boiling point to the first boiling point, while the temperature of the methanol is still maintained at the second temperature value. Since the second temperature value is greater than the first boiling point, the methanol will be instantly gasified at the nozzle without the need for a droplet breakup process, effectively solving the problem of difficult methanol evaporation; thereafter, the methanol is directly mixed with the surrounding air in a gaseous form and can be directly ignited, thereby solving the problem of difficult low-temperature cold start of a pure methanol engine. On the other hand, in the process of improving the performance of a pure methanol engine, the use of the present invention also ensures that a sufficient amount of gaseous methanol can always be sprayed out at the nozzle, thereby enabling the pure methanol engine to operate in a high-performance state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the principle of the methanol heating method of the present invention; Figure 2 It is a structural schematic diagram of the methanol heating system of the present invention; Figure 3 It is a structural schematic diagram of the secondary heating mechanism; Figure 4 It is a structural diagram of the first-level heating mechanism.

[0018] Description of the drawings: 1- low-pressure methanol inlet, 2- boost pump, 3- high-pressure methanol delivery pipe, 4- primary heating mechanism, 5- medium input pipe, 6- medium output pipe, 7- heat conduction block, 8- heating element, 9- methanol diversion pipe, 10- nozzle, 11- pressure sensor, 12- high-pressure oil rail, 13- temperature sensor, 14- connecting plate, 15- fastening bolt, 16- bending part, 17- groove, 18- end plate, 19- heat exchange tube, 20- heat exchange space. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, a flash-injection methanol heating method for a pure methanol engine includes S1 to S2.

[0021] S1. In the process of supplying methanol to the engine, the methanol is pressurized so that the methanol reaches a target pressure.

[0022] S2. Perform secondary heating on methanol so that the temperature of methanol reaches a second temperature value, the second temperature value is greater than the first boiling point of methanol at normal pressure, and the second temperature value is less than the second boiling point of methanol at the target pressure.

[0023] The present invention first pressurizes methanol until the methanol reaches a target pressure, so that the boiling point of the methanol gradually rises from a first boiling point to a second boiling point, and then heats the methanol until the methanol reaches a second temperature value, so that the temperature of the methanol is increased but does not reach the second boiling point, thereby avoiding direct gasification of the methanol in the methanol supply pipeline, and achieving the effect of transporting the methanol at a high pressure and high temperature.

[0024] When high-pressure and high-temperature methanol is ejected from the nozzle 10, its pressure is instantly reduced to normal pressure, and the corresponding boiling point is also instantly reduced from the second boiling point to the first boiling point, while the temperature of the methanol is still maintained at the second temperature value. Since the second temperature value is greater than the first boiling point, the methanol is instantly vaporized at the nozzle 10 without the need for droplet breakage, effectively solving the problem of difficult methanol evaporation. Since the methanol is vaporized the moment it is ejected, it is called flash boiling injection.

[0025] Afterwards, methanol is directly mixed with the surrounding air in gaseous form and can be directly ignited, thereby solving the problem of low-temperature cold start difficulty of pure methanol engines. On the other hand, in the process of improving the performance of pure methanol engines, the use of the present invention also ensures that sufficient gaseous methanol can always be sprayed out from the nozzle 10, so that the pure methanol engine can operate in a high-performance state.

[0026] In addition, the methanol heating process may be performed by first performing primary heating and then performing secondary heating, or by directly performing secondary heating. The method of first performing primary heating and then performing secondary heating is: after the methanol reaches the target pressure, the methanol is first heated to make the temperature of the methanol reach a first temperature value, and when the methanol approaches the nozzle 10, the methanol is second heated to make the temperature of the methanol reach a second temperature value, the first temperature value is less than the second temperature value, and the first temperature value is greater than the first boiling point of the methanol at normal pressure.

[0027] In the state of low-temperature cold start, because there is no additional heat source in the environment, secondary heating is required directly. The secondary heating can be done by electric heating, consuming electric energy to make the methanol reach the second temperature value to meet the needs of flash boiling injection. During the operation of the pure methanol engine, heat will be continuously generated, which will form an additional heat source in the environment. Therefore, when the pure methanol engine is running, the methanol can be heated first. The primary heating can use the heat dissipated by the pure methanol engine to the environment, and then the methanol can be heated to the second temperature value through secondary heating. By recycling the waste heat, the effect of reducing power consumption can be achieved. Accordingly, there is no need to equip large-capacity batteries, which can reduce costs and make it easier to commercialize.

[0028] The method for primary heating of methanol includes S211 to S213.

[0029] S211. Obtain a heating medium, and the temperature of the heating medium is higher than the current ambient temperature.

[0030] S212, transporting the heating medium to the peripheral side of the methanol supply pipeline.

[0031] S213, utilizing the methanol supply pipeline to absorb heat from the heating medium and transfer it to the internal methanol.

[0032] The heating medium can be water, thereby reducing the use cost, and water has a high specific heat capacity, which can absorb more waste heat of the pure methanol engine, thereby fully heating the methanol in the first stage. In addition, since the temperature of the pure methanol engine is very high when it is in operation, the heating medium can be heated to a higher temperature. In order to reduce the difference between the first temperature value and the second temperature value, thereby further reducing the amount of heat required for the second stage heating, when the methanol is heated to the first temperature value in the first stage heating, the first temperature value can be made greater than the first boiling point of the methanol at normal pressure.

[0033] Furthermore, after completing the primary heating, the heating medium is transported to the peripheral side of the engine to use the residual heat of the engine to reheat the heating medium, thereby realizing the recycling of the heating medium and further reducing the cost of use.

[0034] The method for performing secondary heating on methanol includes S221 to S222.

[0035] S221. Supply power to the electric heater disposed on the methanol supply pipeline until the temperature of the electric heater is higher than a second temperature value.

[0036] S222. Utilize the methanol supply pipeline to obtain heat from the electric heater and transfer it to the internal methanol.

[0037] The secondary heating adopts electric heating, which has higher temperature control accuracy and can effectively heat methanol to the second temperature value.

[0038] In the present invention, the second temperature value is 75° C. to 120° C. In actual implementation, the higher the second temperature value, the higher the degree of gasification of methanol when it is sprayed from the nozzle 10, but correspondingly, more electric energy is consumed for heating, and the target pressure also needs to be higher. The appropriate second temperature value can be selected according to actual needs.

[0039] Furthermore, on the basis of performing primary heating and secondary heating of methanol in sequence, or directly performing secondary heating of methanol, methanol can also be initially heated in the methanol fuel tank, or initially heated in the process of methanol flowing from the fuel tank to the boost pump, thereby fully ensuring that flash boiling injection of methanol can be achieved.

[0040] The present invention also provides a flash boiling injection type methanol heating system for a pure methanol engine, which is used to implement the above-mentioned flash boiling injection type methanol heating method for a pure methanol engine. The system includes a primary heating mechanism and a secondary heating mechanism arranged in sequence along the supply direction of methanol, wherein the primary heating mechanism 4 is used to perform primary heating on methanol so that the temperature of methanol reaches a first temperature value, and the secondary heating mechanism is used to perform secondary heating on methanol so that the temperature of methanol reaches a second temperature value.

[0041] More specifically, the primary heating mechanism 4 obtains waste heat from the pure methanol engine through a heating medium, and transports the heating medium to the surrounding side of the methanol supply pipeline to achieve primary heating of the methanol; the secondary heating mechanism performs secondary heating of the methanol through electric heating.

[0042] like Figure 2 and 3 As shown, the specific structure of the primary heating mechanism 4 is as follows: the primary heating mechanism 4 includes a heat exchange tube 19 sleeved on the methanol supply pipeline, and a distance is left between the heat exchange tube 19 and the methanol supply pipeline to form a heat exchange space 20 for the heating medium to pass through. After the heating medium is transported to the peripheral side of the pure methanol engine to obtain waste heat for heating, the heating medium is transported to the heat exchange space 20, and the heat of the heating medium is transferred to the internal methanol through the methanol supply pipeline, thereby achieving primary heating of the methanol. Because the heat exchange space 20 surrounds the methanol supply pipeline, the methanol in the methanol supply pipeline can be evenly heated, and the heating efficiency is higher.

[0043] Furthermore, the heat exchange tube 19 is in the shape of a straight tube as a whole, and both ends are closed by the end plate 18. The end plate 18 is in the shape of a bowl, including a large diameter portion connected to the end of the heat exchange tube 19 and a small diameter portion that can be attached to the peripheral wall of the methanol supply pipeline, and the large diameter portion and the small diameter portion are transitioned by an arc portion. The small diameter portion can also extend a straight tube-shaped connecting portion, and the connecting portion is fixed to the methanol supply pipeline by welding or bonding.

[0044] The heat exchange pipe 19 is also connected to a medium input pipe 5 and a medium output pipe 6 , and the height of the medium input pipe 5 is lower than that of the medium output pipe 6 to ensure that the heat exchange medium can completely fill the heat exchange space 20 .

[0045] like Figure 2 and 3 As shown, the specific structure of the secondary heating mechanism is: the secondary heating mechanism includes at least one heat-conducting block 7 fixedly attached to the methanol supply pipeline, and a cavity is provided on the heat-conducting block 7, in which a heating element 8 is fixedly arranged. In the present invention, the heating element 8 can be made of metal or ceramic material, preferably ceramic material, so as to generate heat more efficiently and energy-savingly. After the heat generated by the heating element 8 is transferred to the heat-conducting block 7, it is transferred to the methanol through the heat-conducting block 7 and the methanol supply pipeline to achieve secondary heating of the methanol. Because the heat-conducting block 7 can have a larger contact area with the methanol supply pipeline, the heat transfer efficiency can be improved by using the heat-conducting block 7, thereby improving the efficiency of the secondary heating.

[0046] Furthermore, the heat conducting block 7 is in the shape of a rectangular parallelepiped as a whole, and a groove 17 is provided on one of the side walls formed by the long sides and the wide sides. The methanol supply pipeline can enter the groove 17 and fully fit with the heat conducting block 7, thereby effectively increasing the contact area between the heat conducting block 7 and the methanol supply pipeline. The two side walls formed by the long sides and the high sides of the heat conducting block 7 are each provided with a curved portion 16 that bulges toward the inner side of the cavity. The curved portion 16 forms a convex portion in the cavity, and a concave portion corresponding to the convex portion is correspondingly provided on the heating element 8. The cooperation of the convex portion and the concave portion can expand the contact area between the heating element 8 and the heat conducting block 7 and improve the heat transfer efficiency on the one hand, and also facilitate the fixing of the heating element 8 on the other hand.

[0047] In order to achieve a better secondary heating effect, in one embodiment of the present invention, the secondary heating mechanism includes two heat-conducting blocks 7, and the grooves 17 on the two heat-conducting blocks 7 are connected to form a storage space capable of accommodating the methanol supply pipeline, that is, the two heat-conducting blocks 7 are respectively located on both sides of the methanol supply pipeline, and are symmetrically arranged about the axis of the methanol supply pipeline. Further, the two heat-conducting blocks 7 are each integrally connected with two connecting plates 14, and the connecting plates 14 on the two heat-conducting blocks 7 are fitted one by one and connected by a plurality of fastening bolts 15. The structure of the connection mechanism is simple and easy to install, disassemble and maintain.

[0048] Based on the specific structures of the above-mentioned primary heating mechanism and secondary heating mechanism, as Figure 3As shown, when the present invention is actually applied to a pure methanol engine, after the methanol in the methanol fuel tank is drawn out, it is transported to the boost pump 2 through the low-pressure methanol inlet 1, the boost pump 2 is used to pressurize the methanol to the target pressure, and then the methanol is transported to the high-pressure oil rail 12 through the high-pressure methanol delivery pipe 3, and the primary heating mechanism 4 is arranged on the high-pressure methanol delivery pipe 3. Afterwards, the methanol is output from the high-pressure oil rail 12 to the methanol shunt pipe 9, and finally transported to the pure methanol engine through the methanol shunt pipe 9. The secondary heat exchange mechanism is arranged on the methanol shunt pipe 9, because the amount of methanol in the methanol shunt pipe 9 is small, so the methanol can be heated to the second temperature value more accurately and efficiently through the secondary heating.

[0049] Finally, the system also includes a controller connected to the primary heating mechanism 4 and the secondary heating mechanism, and the controller is also connected to a pressure sensor 11 for collecting the current pressure of methanol and a temperature sensor 13 for collecting the temperature of methanol when it is sprayed. The pressure sensor 11 is used to collect the pressure of methanol so that the controller can determine whether the methanol reaches the target pressure, and then accurately control the boost pump 2. The temperature sensor 13 is used to collect the temperature of methanol when it is sprayed from the nozzle 10, so that the controller can determine whether the methanol has achieved the above-mentioned flash boiling injection, and then accurately control the primary heating mechanism 4 and the secondary heating mechanism.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flash boiling injection type methanol heating method for a pure methanol engine, characterized in that: The steps include: In the process of supplying methanol to the engine, the methanol is pressurized so that the methanol reaches a target pressure; Performing secondary heating on the methanol so that the temperature of the methanol reaches a second temperature value; The second temperature value is greater than a first boiling point of methanol at normal pressure, and the second temperature value is less than a second boiling point of methanol at the target pressure.

2. A flash boiling injection type methanol heating method for a pure methanol engine as claimed in claim 1, characterized in that: After the methanol reaches the target pressure, the methanol is heated once so that the temperature of the methanol reaches a first temperature value, and when the methanol approaches the nozzle, the methanol is heated twice so that the temperature of the methanol reaches a second temperature value, and the first temperature value is less than the second temperature value.

3. A flash boiling injection type methanol heating method for a pure methanol engine as claimed in claim 2, characterized in that: Methods for primary heating of methanol include: Obtain a heating medium, and the temperature of the heating medium is higher than the current ambient temperature; delivering the heating medium to the peripheral side of the methanol supply pipeline; The methanol supply line absorbs heat from the heating medium and transfers it to the methanol inside.

4. A flash boiling injection type methanol heating method for a pure methanol engine as claimed in claim 3, characterized in that: After the heating medium completes the primary heating, it is transported to the engine periphery to use the engine waste heat to restore the temperature of the heating medium.

5. The flash boiling injection type methanol heating method for a pure methanol engine according to claim 1, characterized in that: Methods for secondary heating of methanol include: supplying power to an electric heater disposed on the methanol supply pipeline until the temperature of the electric heater is higher than a second temperature value; The methanol supply line takes heat from the electric heater and transfers it to the methanol inside.

6. A flash boiling injection type methanol heating method for a pure methanol engine as claimed in claim 1, characterized in that: The second temperature value is 75°C~120°C.

7. A flash boiling injection type methanol heating system for a pure methanol engine, characterized in that: A flash boiling injection type methanol heating method for a pure methanol engine as claimed in any one of claims 1 to 6, the system comprising: A primary heating mechanism (4) and a secondary heating mechanism are sequentially arranged along the supply direction of methanol, wherein the primary heating mechanism (4) is used to perform primary heating on the methanol so that the temperature of the methanol reaches a first temperature value, and the secondary heating mechanism is used to perform secondary heating on the methanol so that the temperature of the methanol reaches a second temperature value.

8. A flash boiling injection type methanol heating system for a pure methanol engine as claimed in claim 7, characterized in that: The primary heating mechanism (4) comprises a heat exchange tube (19) sleeved on the methanol supply pipeline, and a distance is left between the heat exchange tube (19) and the methanol supply pipeline to form a heat exchange space (20) for the heating medium to pass through.

9. A flash boiling injection type methanol heating system for a pure methanol engine as claimed in claim 7, characterized in that: The secondary heating mechanism comprises at least one heat conducting block (7) fixedly mounted on the methanol supply pipeline, wherein a cavity is provided on the heat conducting block (7), and a heating element (8) is fixedly arranged in the cavity.

10. A flash boiling injection type methanol heating system for a pure methanol engine as claimed in claim 7, characterized in that: The system further comprises a controller connected to the primary heating mechanism (4) and the secondary heating mechanism, and the controller is further connected to a pressure sensor (11) for collecting the current pressure of methanol and a temperature sensor (13) for collecting the temperature of methanol when it is sprayed out.

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