A spark-ignition methanol cracking gas engine

Abstract

The invention discloses an ignition type methanol cracking gas engine, which belongs to the technical field of methanol engines. The invention evaporates methanol and water through an evaporator, uses a methanol cracker to carry out cracking reaction, adopts a gas mixing tank to mix methanol cracking gas and air, and enters the ignition type engine for ignition. The invention can solve the problems of low thermal efficiency at low and medium loads and easy knock at high loads of the original ignition type methanol cracking gas engine. The invention adopts plasma to improve the combustion speed at low loads, adopts methanol water vapor cracking and adds hot EGR to improve the hydrogen production rate at medium loads, and adopts cold EGR to reduce the knock tendency at high loads to improve the thermal efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of methanol engines, and in particular relates to an ignition type methanol cracking gas engine. Background Art

[0002] The methanol cracking gas engine is developed to improve the economy of the methanol engine through waste energy recovery and methanol-hydrogen combustion. The methanol cracking gas engine is equipped with two fuel systems, one is direct supply from methanol combustion, and the other is supply of cracking gas generated by methanol cracking device.

[0003] The methanol cracking unit can catalyze methanol to produce hydrogen and other gases, and is a key component of the methanol cracking gas engine. However, due to the unpredictability of the operating conditions of the vehicle engine, the hydrogen production rate of the methanol cracking unit is uncertain, especially at low loads, when the exhaust temperature is low and the hydrogen production rate is extremely low. At high loads, the methanol cracking unit has a high hydrogen production rate, but high-load hydrogen mixing is prone to detonation.

[0004] The invention discloses a spark-ignition methanol cracking gas engine system and a control method thereof, which can switch to a suitable working mode under various working conditions. The control method of the invention can optimize the combustion of the methanol cracking gas engine under various working conditions and improve the economy. Summary of the invention

[0005] The purpose of the present invention is to provide a spark-ignition methanol cracking gas engine to solve the contradiction between the hydrogen production rate of the methanol cracking device and the combustion characteristics of methanol-hydrogen blending under different engine operating conditions.

[0006] The invention discloses a spark-ignition methanol cracking gas engine, which comprises a gas mixing tank A, an evaporator B, a methanol cracker C, a spark-ignition engine D, a throttle 1, an air intake duct 2, a one-way valve I3, an electromagnetic valve I4, a methanol pipe 5, a methanol cracking gas pipe 6, a methanol tank 7, a methanol pump 8, a pure water pump 9, a one-way valve II10, an EGR intercooler 11, a cold EGR pipe 12, an electromagnetic valve II13, a temperature sensor 14, an exhaust gas exhaust pipe 15, a methanol steam pipe 16, a total exhaust pipe 17, a heavy-load exhaust pipe 18, an exhaust valve 19, a one-way valve III20, an electromagnetic valve III21, a hot EGR pipe 22, an exhaust gas intake pipe 23, a pure water heater 24, a pure water tank 25 and a pure water pipe 26, wherein the front lower portion of the spark-ignition engine D is An engine hot coolant circulation pipe 49 is provided, an engine air intake 50 is provided at the upper front of the spark ignition engine D, and an engine exhaust port 51 is provided at the upper rear of the spark ignition engine D; the gas mixing tank A and the spark ignition engine D are arranged front and back, the methanol cracker C and the evaporator B are arranged left and right, and are located at the right rear of the spark ignition engine D; the engine air intake 50 of the spark ignition engine D is connected to the mixed gas outlet 32 ​​of the gas mixing tank A; the air intake 28 of the gas mixing tank A is connected to the rear end of the intake duct 2, and the throttle 1 is installed at the front of the intake duct 2; the gas mixing tank A is installed in the middle of the intake duct 2; the one-way valve I3 and the solenoid valve I4 are arranged left and right, and are installed at the front left end of the methanol cracking gas pipe 6, and this end of the methanol cracking gas pipe 6 is connected to the gas mixing tank A is connected to the methanol cracking gas inlet 30 of the methanol cracking gas pipe 6, and the right rear end of the methanol cracking gas pipe 6 is connected to the methanol cracking gas outlet 40 of the methanol cracker C; the temperature sensor 14 is installed at the front left end of the exhaust gas exhaust pipe 15, and is connected to the heat exchange exhaust gas outlet 44 of the methanol cracker C, and the right rear end of the exhaust gas exhaust pipe 15 is connected to the exhaust gas inlet 34 of the evaporator B; the one-way valve II 10, the EGR intercooler 11 and the solenoid valve II 13 are installed on the cold EGR pipe 12 from front to back; the front left end of the cold EGR pipe 12 is connected to the methanol cracking gas pipe 6, and the right rear end of the cold EGR pipe 12 is connected to the exhaust gas exhaust pipe 15; the rear right end of the methanol vapor pipe 16 is connected to the methanol water vapor outlet 38 of the evaporator B, and the left front end of the methanol vapor pipe 16 is connected to the exhaust gas outlet 38 on the methanol cracker C The methanol vapor inlet 45 is connected; the left end of the exhaust gas intake pipe 23 is connected to the front part of the heavy-load exhaust pipe 18, and the right end of the exhaust gas intake pipe 23 is connected to the exhaust gas inlet 48 of the methanol cracker C; the exhaust valve 19 is installed in the middle of the heavy-load exhaust pipe 18; the solenoid valve III 21 and the one-way valve III 20 are arranged on the left and right and installed on the right part of the hot EGR pipe 22; the left end of the hot EGR pipe 22 is connected to the heavy-load exhaust pipe 18, and the right end of the hot EGR pipe 22 is connected to the EGR inlet 46 of the methanol cracker C; the left front end of the heavy-load exhaust pipe 18 is connected to the engine exhaust port 51 of the spark-ignition engine D, and the rear right end of the heavy-load exhaust pipe 18 is connected to the front part of the main exhaust pipe 17; the front end of the main exhaust pipe 17 is connected to the exhaust gas outlet 37 of the evaporator B;The left front end of the pure water pipe 26 is inserted into the pure water tank 25, the right rear end of the pure water pipe 26 is connected to the water nozzle 36 of the evaporator B, and the near left end of the pure water pipe 26 is connected to the engine hot coolant circulation pipe 49 of the spark ignition engine D through the pure water heater 24; the front left end of the methanol pipe 5 is inserted into the methanol tank 7, and the rear part of the methanol pipe 5 is divided into two parts, one of which is connected to the methanol nozzle Ⅰ29 of the gas mixing tank A, and the other is connected to the methanol nozzle Ⅱ35 of the evaporator B; the methanol pump 8 is installed at the front left part of the methanol pipe 5; the pure water pump 9 is installed at the front right part of the pure water pipe 26. ;

[0007] The gas mixing tank A is composed of an outer shell Ⅰ27, a methanol nozzle Ⅰ29, and a plasma gun 31. The outer shell Ⅰ27 is a rectangular parallelepiped, with an air inlet 28 at the front center, a methanol cracking gas inlet 30 at the right center, and a mixed gas outlet 32 ​​at the rear center; the methanol nozzle Ⅰ29 is fixedly connected to the front right side of the outer shell Ⅰ27; the plasma gun 31 is fixedly connected to the rear right side of the outer shell Ⅰ27.

[0008] The evaporator B is composed of a shell II 33, a methanol nozzle II 35 and a water nozzle 36. The shell II 33 is a rectangular parallelepiped. An exhaust gas inlet 34 is provided at the center of the front of the shell II 33, an exhaust gas outlet 37 is provided at the center of the back of the shell II 33, and a methanol water vapor outlet 38 is provided at the center of the bottom of the shell II 33; the methanol nozzle II 35 is fixedly connected to the front of the shell II 33 near the upper end; the water nozzle 36 is fixedly connected to the back of the shell II 33 near the upper end.

[0009] The methanol cracker C is composed of a shell III 39, a methanol steam cracking tube 41, a methanol cracking catalyst 42, a metal wire 43 and a support plate 47. Two support plates 47 are arranged on both sides of the shell III 39. The methanol steam cracking tube 41 is fixedly connected to the two support plates. The metal wire 43 is installed in the methanol steam cracking tube, and the methanol cracking catalyst 42 is coated on the metal wire 43. The shell III 39 is cylindrical; a methanol cracking gas outlet 40 is arranged at the center of the front of the shell III 39; a heat exchange exhaust gas outlet 44 is arranged on the right side of the shell III 39; a methanol vapor inlet 45 is arranged at the center of the rear of the shell III 39; an EGR inlet 46 is arranged at the rear of the left side of the shell III 39; and an exhaust gas inlet 48 is arranged at the front of the left side of the shell III 39.

[0010] The beneficial effects of the present invention are as follows: it can solve the problems of low thermal efficiency at low and medium loads and easy detonation at high loads of the original spark-ignition methanol cracking gas engine, adopt a plasma method to increase the combustion speed at low loads, adopt methanol water vapor cracking and add hot EGR to increase the hydrogen production rate at medium loads, and adopt cold EGR to reduce the detonation tendency at high loads to improve the thermal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a spark-ignition methanol cracking gas engine;

[0012] Figure 2 It is a schematic diagram of the structure of the gas mixing tank A;

[0013] Figure 3 It is the structural schematic diagram of evaporator B;

[0014] Figure 4 It is a structural schematic diagram of a methanol cracker C;

[0015] Figure 5 It is a structural schematic diagram of a spark ignition engine D;

[0016] Among them: A. Gas mixing tank B. Evaporator C. Methanol cracker D. Spark ignition engine 1. Throttle 2. Intake duct 3. Check valve I 4. Solenoid valve I 5. Methanol pipe 6. Methanol cracking gas pipe 7. Methanol tank 8. Methanol pump 9. Pure water pump 10. Check valve II 11. EGR intercooler 12. Cold EGR pipe 13. Solenoid valve II 14. Temperature sensor 15. Exhaust gas exhaust pipe 16. Methanol vapor pipe 17. Main exhaust pipe 18. High-load exhaust pipe 19. Exhaust valve 20. Check valve III 21. Solenoid valve III 22. Hot EGR pipe 23. Exhaust gas intake pipe 24. Pure water heater 25. Pure water tank 26. Pure water pipe 27. Shell I 28. Air inlet 29. Methanol nozzle I 30. Methanol cracking gas inlet 31. Plasma gun 32. Mixed gas outlet 33. Shell II 34. Exhaust gas inlet 35. Methanol nozzle II 36. Water nozzle 37. Exhaust gas outlet 38. Methanol water vapor outlet 39. Shell III 40. Methanol cracking gas outlet 41. Methanol vapor cracking tube 42. Methanol cracking catalyst 43. Metal wire 44. Heat exchange exhaust gas outlet 45. Methanol vapor inlet 46. EGR inlet 47. Support plate 48. Exhaust gas inlet 49. Engine hot coolant circulation pipe 50. Engine air intake 51. Engine exhaust port. DETAILED DESCRIPTION

[0017] The present invention is described below with reference to the accompanying drawings.

[0018] like Figure 1As shown, a spark-ignition methanol cracking gas engine of the present invention is composed of a gas mixing tank A, an evaporator B, a methanol cracker C, a spark-ignition engine D, a throttle 1, an air intake duct 2, a one-way valve I3, a solenoid valve I4, a methanol pipe 5, a methanol cracking gas pipe 6, a methanol tank 7, a methanol pump 8, a pure water pump 9, a one-way valve II10, an EGR intercooler 11, a cold EGR pipe 12, a solenoid valve II13, a temperature sensor 14, an exhaust gas exhaust pipe 15, a methanol vapor pipe 16, a total exhaust pipe 17, a heavy-load exhaust pipe 18, an exhaust valve 19, a one-way valve III20, a solenoid valve III21, a hot EGR pipe 22, an exhaust gas intake pipe 23, a pure water heater 24, a pure water tank 25 and a pure water pipe 26, wherein the front side of the spark-ignition engine D An engine hot coolant circulation pipe 49 is provided at the lower part, an engine air intake 50 is provided at the upper front of the spark ignition engine D, and an engine exhaust port 51 is provided at the upper rear of the spark ignition engine D; the gas mixing tank A and the spark ignition engine D are arranged front and back, the methanol cracker C and the evaporator B are arranged left and right, and are located at the right rear of the spark ignition engine D; the engine air intake 50 of the spark ignition engine D is communicated with the mixed gas outlet 32 ​​of the gas mixing tank A; the air intake 28 of the gas mixing tank A is communicated with the rear end of the intake duct 2, and the throttle 1 is installed at the front of the intake duct 2; the gas mixing tank A is installed in the middle of the intake duct 2; the one-way valve I3 and the solenoid valve I4 are arranged left and right, and are installed at the front left end of the methanol cracking gas pipe 6, and this end of the methanol cracking gas pipe 6 is connected to the gas mixing gas outlet 32. The methanol cracking gas inlet 30 of the combined tank A is connected, and the right rear end of the methanol cracking gas pipe 6 is connected to the methanol cracking gas outlet 40 of the methanol cracker C; the temperature sensor 14 is installed at the front left end of the exhaust gas exhaust pipe 15, and is connected to the heat exchange exhaust gas outlet 44 of the methanol cracker C, and the right rear end of the exhaust gas exhaust pipe 15 is connected to the exhaust gas inlet 34 of the evaporator B; the one-way valve II 10, the EGR intercooler 11 and the solenoid valve II 13 are installed on the cold EGR pipe 12 from front to back; the front left end of the cold EGR pipe 12 is connected to the methanol cracking gas pipe 6, and the right rear end of the cold EGR pipe 12 is connected to the exhaust gas exhaust pipe 15; the rear right end of the methanol vapor pipe 16 is connected to the methanol water vapor outlet 38 of the evaporator B, and the left front end of the methanol vapor pipe 16 is connected to the methanol cracker C The left end of the exhaust gas intake pipe 23 is connected to the front part of the heavy-load exhaust pipe 18, and the right end of the exhaust gas intake pipe 23 is connected to the exhaust gas inlet 48 of the methanol cracker C; the exhaust valve 19 is installed in the middle part of the heavy-load exhaust pipe 18; the solenoid valve III 21 and the one-way valve III 20 are arranged on the left and right and installed on the right part of the hot EGR pipe 22; the left end of the hot EGR pipe 22 is connected to the heavy-load exhaust pipe 18, and the right end of the hot EGR pipe 22 is connected to the EGR inlet 46 of the methanol cracker C; the left front end of the heavy-load exhaust pipe 18 is connected to the engine exhaust port 51 of the spark-ignition engine D, and the rear right end of the heavy-load exhaust pipe 18 is connected to the front part of the main exhaust pipe 17; the front end of the main exhaust pipe 17 is connected to the exhaust gas outlet 37 of the evaporator B;The left front end of the pure water pipe 26 is inserted into the pure water tank 25, the right rear end of the pure water pipe 26 is connected to the water nozzle 36 of the evaporator B, and the near left end of the pure water pipe 26 is connected to the engine hot coolant circulation pipe 49 of the spark ignition engine D through the pure water heater 24; the front left end of the methanol pipe 5 is inserted into the methanol tank 7, and the rear part of the methanol pipe 5 is divided into two parts, one of which is connected to the methanol nozzle Ⅰ29 of the gas mixing tank A, and the other is connected to the methanol nozzle Ⅱ35 of the evaporator B; the methanol pump 8 is installed at the front left part of the methanol pipe 5; the pure water pump 9 is installed at the front right part of the pure water pipe 26. ;

[0019] like Figure 2 As shown, the gas mixing tank A is composed of a shell Ⅰ27, a methanol nozzle Ⅰ29, and a plasma gun 31. The shell Ⅰ27 is a rectangular parallelepiped, with an air inlet 28 at the front center, a methanol cracking gas inlet 30 at the right center, and a mixed gas outlet 32 ​​at the rear center; the methanol nozzle Ⅰ29 is fixedly connected to the front right side of the shell Ⅰ27; the plasma gun 31 is fixedly connected to the rear right side of the shell Ⅰ27.

[0020] like Figure 3 As shown, the evaporator B is composed of a shell II 33, a methanol nozzle II 35 and a water nozzle 36. The shell II 33 is a rectangular parallelepiped. An exhaust gas inlet 34 is provided at the center of the front of the shell II 33, an exhaust gas outlet 37 is provided at the center of the back of the shell II 33, and a methanol water vapor outlet 38 is provided at the center of the bottom of the shell II 33; the methanol nozzle II 35 is fixedly connected to the front of the shell II 33 near the upper end; the water nozzle 36 is fixedly connected to the back of the shell II 33 near the upper end.

[0021] like Figure 4 As shown, the methanol cracker C is composed of a shell III 39, a methanol steam cracking tube 41, a methanol cracking catalyst 42, a metal wire 43 and a support plate 47. Two support plates 47 are arranged on both sides of the inside of the shell III 39, the methanol steam cracking tube 41 is fixedly connected to the two support plates, the metal wire 43 is installed in the methanol steam cracking tube, and the methanol cracking catalyst 42 is coated on the metal wire 43; the shell III 39 is cylindrical; a methanol cracking gas outlet 40 is arranged at the center of the front of the shell III 39; a heat exchange exhaust gas outlet 44 is arranged on the right side of the shell III 39; a methanol vapor inlet 45 is arranged at the center of the rear of the shell III 39; an EGR inlet 46 is arranged at the rear of the left side of the shell III 39; and an exhaust gas inlet 48 is arranged at the front of the left side of the shell III 39.

Claims

1. A spark-ignition methanol cracking gas engine, comprising a gas mixing tank (A), an evaporator (B), a methanol cracker (C), a spark-ignition engine (D), a throttle (1), an air intake duct (2), a check valve I (3), a solenoid valve I (4), a methanol pipe (5), a methanol cracking gas pipe (6), a methanol tank (7), a methanol pump (8), a pure water pump (9), a check valve II (10), an EGR intercooler (11), a cold EGR pipe (12), a solenoid valve II (13), a temperature sensor (14), an exhaust gas exhaust pipe (15), and a methanol vapor pipe (16) , a main exhaust pipe (17), a heavy-load exhaust pipe (18), an exhaust valve (19), a non-return valve III (20), an electromagnetic valve III (21), a hot EGR pipe (22), an exhaust gas intake pipe (23), a pure water heater (24), a pure water tank (25) and a pure water pipe (26), wherein an engine hot coolant circulation pipe (49) is provided at the lower front side of the spark-ignition engine (D), an engine air intake port (50) is provided at the upper front side of the spark-ignition engine (D), and an engine exhaust port (51) is provided at the upper rear side of the spark-ignition engine (D); the characteristics are: The gas mixing tank (A) and the spark ignition engine (D) are arranged front and back, the methanol cracker (C) and the evaporator (B) are arranged left and right, and are located at the right rear of the spark ignition engine (D); the engine air intake (50) of the spark ignition engine (D) is connected to the mixed gas outlet (32) of the gas mixing tank (A); the air intake (28) of the gas mixing tank (A) is connected to the rear end of the intake duct (2), and the throttle valve (1) is installed at the front part of the intake duct (2); the gas mixing tank (A) is installed in the middle part of the intake duct (2); the one-way valve I (3) and the solenoid valve I (4) are arranged left and right, and are installed at the front left end of the methanol cracking gas pipe (6), and this end of the methanol cracking gas pipe (6) is connected to the methanol cracking gas inlet (30) of the gas mixing tank (A), and the methanol cracking gas pipe (6) is connected to the methanol cracking gas inlet (30) of the gas mixing tank (A). The right rear end of the gas pipe (6) is connected to the methanol cracking gas outlet (40) of the methanol cracker (C); the temperature sensor (14) is installed at the front left end of the waste gas exhaust pipe (15) and is connected to the heat exchange waste gas outlet (44) of the methanol cracker (C); the right rear end of the waste gas exhaust pipe (15) is connected to the waste gas inlet (34) of the evaporator (B); the one-way valve II (10), the EGR intercooler (11) and the solenoid valve II (13) are installed on the cold EGR pipe (12) from front to back; the front left end of the cold EGR pipe (12) is connected to the methanol cracking gas pipe (6), and the right rear end of the cold EGR pipe (12) is connected to the waste gas exhaust pipe (15); the rear right end of the methanol vapor pipe (16) is connected to the methanol water vapor outlet (38) of the evaporator (B), and the methanol vapor pipe (16) is connected to the methanol water vapor outlet (38) of the evaporator (B). The left front end of the alcohol vapor pipe (16) is connected to the methanol vapor inlet (45) on the methanol cracker (C); the left end of the exhaust gas intake pipe (23) is connected to the front part of the heavy-load exhaust pipe (18), and the right end of the exhaust gas intake pipe (23) is connected to the exhaust gas inlet (48) of the methanol cracker (C); the exhaust valve (19) is installed in the middle of the heavy-load exhaust pipe (18); the solenoid valve III (21) and the one-way valve III (20) are arranged on the left and right and installed on the right part of the hot EGR pipe (22); the left end of the hot EGR pipe (22) is connected to the heavy-load exhaust pipe (18), and the right end of the hot EGR pipe (22) is connected to the EGR inlet (46) of the methanol cracker (C); the left front end of the heavy-load exhaust pipe (18) is connected to the engine exhaust of the spark-ignition engine (D); The main exhaust pipe (17) is connected to the exhaust port (51); the rear right end of the heavy-load exhaust pipe (18) is connected to the front part of the main exhaust pipe (17); the front end of the main exhaust pipe (17) is connected to the exhaust gas outlet (37) of the evaporator (B); the left front end of the pure water pipe (26) is inserted into the pure water tank (25), the right rear end of the pure water pipe (26) is connected to the water nozzle (36) of the evaporator (B), and the near left end of the pure water pipe (26) is connected to the engine hot coolant circulation pipe (49) of the spark-ignition engine (D) through the pure water heater (24); the front left end of the methanol pipe (5) is inserted into the methanol tank (7), and the rear part of the methanol pipe (5) is divided into two parts, one of which is connected to the methanol nozzle I (29) of the gas mixing tank (A), and the other is connected to the methanol nozzle II (35) of the evaporator (B);The methanol pump (8) is installed on the front left part of the methanol pipe (5); the pure water pump (9) is installed on the front right part of the pure water pipe (26).

2. The spark-ignition methanol cracking gas engine according to claim 1, characterized in that: The gas mixing tank (A) is composed of a shell I (27), a methanol nozzle I (29), and a plasma gun (31). The shell I (27) is a rectangular parallelepiped, and is provided with an air inlet (28) at the center of the front, a methanol cracking gas inlet (30) at the center of the right, and a mixed gas outlet (32) at the center of the back; the methanol nozzle I (29) is fixedly connected to the front right side of the shell I (27); and the plasma gun (31) is fixedly connected to the rear right side of the shell I (27).

3. The spark-ignition methanol cracking gas engine according to claim 1, characterized in that: The evaporator (B) is composed of a shell II (33), a methanol nozzle II (35) and a water nozzle (36). The shell II (33) is a rectangular parallelepiped. An exhaust gas inlet (34) is provided at the center of the front of the shell II (33), an exhaust gas outlet (37) is provided at the center of the back of the shell II (33), and a methanol water vapor outlet (38) is provided at the center of the bottom of the shell II (33). The methanol nozzle II (35) is fixedly connected to the front of the shell II (33) near the upper end; the water nozzle (36) is fixedly connected to the back of the shell II (33) near the upper end.

4. The spark-ignition methanol cracking gas engine according to claim 1, characterized in that: The methanol cracker (C) is composed of a shell III (39), a methanol steam cracking tube (41), a methanol cracking catalyst (42), a metal wire (43) and a support plate (47). Two support plates (47) are arranged on both sides of the shell III (39), the methanol steam cracking tube (41) is fixedly connected to the two support plates, the metal wire (43) is installed in the methanol steam cracking tube, and the methanol cracking catalyst (42) is coated on the metal wire (43); the shell III (39) is cylindrical; a methanol cracking gas outlet (40) is arranged at the center of the front of the shell III (39); a heat exchange exhaust gas outlet (44) is arranged on the right side of the shell III (39); a methanol vapor inlet (45) is arranged at the center of the rear of the shell III (39); an EGR inlet (46) is arranged at the rear of the left side of the shell III (39); and an exhaust gas inlet (48) is arranged at the front of the left side of the shell III (39).

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