Intake device and combustion system

Abstract

An intake device is provided, comprising: an engine body; a piston mounted within the engine body; a cylinder head mounted at an opening of the engine body, wherein the cylinder head, engine body, and piston define a first combustion chamber; an intake portion comprising: a second combustion chamber formed within the cylinder head and connected to the first combustion chamber; and a premixing tank, wherein the intake end of the premixing tank is connected to an air source and a gas source, respectively, and the exhaust end of the premixing tank is connected to the second combustion chamber; wherein air and gas are mixed within the premixing tank, and the mixed gas is output into the second combustion chamber. A combustion system is also provided, comprising: an intake device; a natural gas storage tank; and a compressed air storage tank; wherein the output ends of the natural gas storage tank and the compressed air storage tank are respectively connected to the premixing tank.

Description

Technical Field

[0001] The present invention relates to the technical field of internal combustion engines, and in particular to an air intake device and a combustion system. Background Art

[0002] At present, for pre-combustion chamber natural gas engines, the pre-combustion chamber mostly uses an injector or an air intake hole to directly inject natural gas. The natural gas is mixed with the remaining air from the previous cycle in the pre-combustion chamber, and after ignition, it ignites the natural gas in the main combustion chamber.

[0003] However, the pre-combustion chamber is smaller and more complex than the main combustion chamber. This can lead to uneven distribution of the pre-combustion chamber's equivalence ratio, which in turn causes localized lean combustion areas that are difficult to ignite, increasing the probability of pre-combustion chamber fires. Furthermore, due to large fluctuations in the fuel's equivalence ratio, combustion in the pre-combustion chamber is also unstable.

[0004] Furthermore, after each cycle, high-temperature exhaust gas is likely to remain in the pre-combustion chamber, which may cause pre-combustion chamber ablation and fire in the next cycle, thereby reducing the reliability of the combustion system. Summary of the Invention

[0005] In response to the existing technical problems, the present invention provides an air intake device and a combustion system, which are used to at least partially solve the above technical problems.

[0006] One aspect of the present disclosure provides an intake device, comprising: a body; a piston installed in the body; a cylinder head installed at an opening position of the body, the cylinder head, the body and the piston defining a first combustion chamber; an intake portion, comprising: a second combustion chamber formed in the cylinder head and connected to the first combustion chamber; and a premixing tank, the intake end of the premixing tank being connected to the air source and the gas source respectively, and the exhaust end of the premixing tank being connected to the second combustion chamber; wherein the air and the gas are mixed in the premixing tank, and the mixed gas is output into the second combustion chamber.

[0007] According to an embodiment of the present disclosure, the air intake device further includes an air intake passage formed in the cylinder head, and the air intake passage is in communication with the fuel gas source.

[0008] According to an embodiment of the present disclosure, the air intake device further includes an injection valve provided on the gas delivery pipeline between the premixing tank and the second combustion chamber.

[0009] According to an embodiment of the present disclosure, a premixing chamber is formed in the premixing tank, and an auxiliary heating component is provided in the premixing chamber.

[0010] According to an embodiment of the present disclosure, the air intake portion includes: a shell, in which the second combustion chamber is formed; a spark plug, arranged on the shell, and the discharge end of the spark plug is located in the second combustion chamber; an air duct formed on the shell, the first end of the air duct is connected to the second combustion chamber, and the second end of the air duct is connected to the premixing tank; and a jet hole formed at the end of the shell located in the first combustion chamber.

[0011] According to an embodiment of the present disclosure, the jet hole includes: a contraction section disposed facing the second combustion chamber; an expansion section disposed facing the first combustion chamber; and a throat disposed between the contraction section and the expansion section; wherein the radial cross-sectional areas of the contraction section, the expansion section, and the throat satisfy the following formula 1 to increase the ejection velocity of the jet hole;

[0012]

[0013] In formula 1, A any Characterizes the cross-sectional area of ​​the expansion section; A C Characterizes the cross-sectional area of ​​the throat; Ma any Characterizes the ejection velocity of the jet hole; k is the adiabatic index of air.

[0014] According to an embodiment of the present disclosure, the air intake device also includes a monitoring part, including: a first monitoring component, arranged in the premixing tank, for monitoring the pressure and / or temperature in the premixing tank; and a second monitoring component, arranged in the second combustion chamber, for monitoring the pressure and / or temperature in the second combustion chamber.

[0015] According to an embodiment of the present disclosure, the air intake device also includes a control unit, including: a solenoid valve, which is arranged on the air delivery pipeline between the premixing tank and the air source, for realizing the conduction or disconnection of the air delivery pipeline; and a control unit, which is electrically connected to the first monitoring component, the second monitoring component and the solenoid valve, respectively, for collecting the signals output by the first monitoring component and the second monitoring component, and controlling the conduction or disconnection of the solenoid valve.

[0016] Another aspect of the present disclosure provides a combustion system, comprising: an air intake device; a natural gas storage tank; and a compressed air storage tank; wherein output ends of the natural gas storage tank and the compressed air storage tank are respectively connected to a premixing tank.

[0017] According to an embodiment of the present disclosure, the combustion system further includes a one-way valve on the gas delivery pipeline connecting the natural gas storage tank and the premixing tank and connecting the compressed air storage tank and the premixing tank.

[0018] The present disclosure provides an air intake device, in which a premixing tank is provided at the air intake end of a second combustion chamber. On the one hand, air and gas are premixed in the premixing tank, so that the mixed gas entering the second combustion chamber is premixed according to the required equivalence ratio, which can effectively reduce the lean burn and difficult-to-ignite area in the second combustion chamber. On the other hand, because the premixing tank is connected to the second combustion chamber, the space for mixing air and gas is correspondingly increased, which is conducive to more complete mixing of air and gas. Moreover, after a combustion cycle is completed, the mixed gas in the premixing tank can also be passed into the second combustion chamber to achieve scavenging treatment for the second burner.

[0019] The present disclosure also provides a combustion system that uses a natural gas storage tank and a compressed air storage tank as gas sources in conjunction with the air intake device, so that the combustion system has the advantages of the above-mentioned air intake devices, which is conducive to more stable and uniform combustion of natural gas in the combustion system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of module connections of an air intake device according to an exemplary embodiment of the present disclosure;

[0021] Figure 2 yes Figure 1 A partial schematic diagram of a cylinder head portion of the illustrated exemplary embodiment;

[0022] Figure 3 yes Figure 1 a schematic diagram of the premix tank portion of the illustrated exemplary embodiment;

[0023] Figure 4 yes Figure 1 a radial cross-sectional view of a portion of the air intake section of the illustrated exemplary embodiment;

[0024] Figure 5 yes Figure 1 A partial enlarged view of the jet hole portion of the exemplary embodiment shown;

[0025] Figure 6 yes Figure 1 A schematic diagram of module connections between the monitoring unit and the control unit of the exemplary embodiment shown; and

[0026] Figure 7 Schematic diagram of module connections of a combustion system according to an exemplary embodiment of the present disclosure.

[0027] Reference numerals

[0028] 1. Premix tank;

[0029] 2. Cylinder head;

[0030] 21. Air intake;

[0031] 22. Intake valve;

[0032] 3. Body;

[0033] 4. Piston;

[0034] 5. Air intake;

[0035] 51. Shell;

[0036] 52. Spark plug;

[0037] 53. Airway;

[0038] 54. Second combustion chamber;

[0039] 55. Jet hole;

[0040] 551, contraction section;

[0041] 552, throat;

[0042] 553, expansion section;

[0043] 6. First combustion chamber;

[0044] 7. Control Department;

[0045] 8. Monitoring Department;

[0046] 81. First monitoring component;

[0047] 811. First temperature sensor;

[0048] 812. First pressure sensor;

[0049] 82. Second monitoring component;

[0050] 821, second temperature sensor;

[0051] 822, second pressure sensor;

[0052] 9. Pipeline components;

[0053] 91. Natural gas storage tanks;

[0054] 92. Jet valve;

[0055] 93. One-way valve;

[0056] 94. Solenoid valve;

[0057] 95. Filters; and

[0058] 96. Compressed air storage tank. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0060] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise," "include," etc. used herein indicate the presence of the features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0061] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0062] When expressions such as “at least one of A, B, and C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, and C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc. When expressions such as “at least one of A, B, or C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, or C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc.

[0063] Figure 1 is a schematic diagram of module connections of an air intake device according to an exemplary embodiment of the present disclosure; Figure 2 yes Figure 1 A partial schematic diagram of a cylinder head portion of the illustrated exemplary embodiment; Figure 3 yes Figure 1 a schematic diagram of the premix tank portion of the illustrated exemplary embodiment; Figure 4 yes Figure 1 a radial cross-sectional view of a portion of the air intake section of the illustrated exemplary embodiment; Figure 5 yes Figure 1 A partial enlarged view of the jet hole portion of the exemplary embodiment is shown.

[0064] The present disclosure provides an air intake device, such as Figures 1 to 6As shown, the engine comprises a body 3, a piston 4 mounted within the body 3, and a cylinder head 2 mounted at an opening of the body 3. An air intake 5 is provided within the cylinder head 2, forming a second combustion chamber 54 and a premixing tank 1. The cylinder head 2, the body 3, and the piston 4 define a first combustion chamber 6; the second combustion chamber 54 communicates with the first combustion chamber 6. The air intake end of the premixing tank 1 is respectively connected to an air source and a gas source, and is connected to the second combustion chamber 54 through the exhaust end of the premixing tank 1.

[0065] In an exemplary embodiment, the fuel gas source includes, but is not limited to, natural gas.

[0066] Specifically, the gas source and the air source should have certain pressures, wherein the pressure conditions should satisfy that the gas and air can be introduced into the second combustion chamber 54 under a pressure difference.

[0067] According to the embodiments of the present disclosure, Figure 2 As shown, the intake device further includes an intake passage 21 formed in the cylinder head 2 , and the intake passage 21 is connected to a fuel gas source.

[0068] In an illustrative embodiment, the fuel gas source is connected to the air intake duct 21 through a gas delivery pipeline, and an injection valve 92 is installed at the connection position between the gas delivery pipeline and the air intake duct 21 to inject the fuel gas into the air intake duct 21 .

[0069] Furthermore, an intake valve 22 is installed in the intake passage 21 , and the injection valve 92 is arranged in the intake passage 21 at an upstream position of the intake valve 22 .

[0070] According to the embodiments of the present disclosure, Figure 1 As shown, the air intake device further includes a gas injection valve 92 disposed on the gas delivery pipeline between the premixing tank 1 and the second combustion chamber 54. In the above embodiment, the injection valve 92 is used to inject the mixed gas discharged from the premixing tank 1 into the second combustion chamber 54, which is more conducive to the diffusion of the mixed gas in the second combustion chamber 54.

[0071] Furthermore, injection valves 92 are also provided on the gas delivery pipelines between the gas source and the premixing tank 1 , and between the gas source and the air inlet duct 21 , respectively, to facilitate diffusion of the gas in the premixing tank 1 and the air inlet duct 21 .

[0072] According to the embodiments of the present disclosure, Figure 3 As shown, a premixing chamber is formed in the premixing tank 1, and an auxiliary heating component is provided in the premixing chamber to perform auxiliary heating on the premixing chamber, which is beneficial to accelerate the diffusion of gas and / or air in the premixing tank 1 to form a more uniform mixed gas.

[0073] In an exemplary embodiment, the auxiliary heating component includes a heating wire, which is coiled along the inner wall of the premixing chamber. It should be understood that the embodiments of the present disclosure are not limited thereto.

[0074] For example, the auxiliary heating component can also use a device such as a coil with a high-temperature medium circulating inside. The high-temperature medium can be the exhaust gas generated during the combustion process, and the coil recovers the waste heat of the exhaust gas to achieve auxiliary heating.

[0075] In an exemplary embodiment, the volume of the premixing chamber can be set to 500 to 1000 ml. It should be understood that the embodiments of the present disclosure are not limited thereto.

[0076] For example, the volume of the premixing tank 1 can be designed according to actual combustion requirements, and other containers with a volume less than 500 ml or greater than 1000 ml can also be used.

[0077] Furthermore, the premixing tank 1 should be a pressure vessel, and the volume of the pressure vessel can be increased or decreased accordingly based on the pressure limit of the pressure vessel.

[0078] According to the embodiments of the present disclosure, Figure 4 As shown, the air intake portion 5 includes a housing 51, a spark plug 52, an air duct 53, and a jet hole 55 provided on the housing 51. A second combustion chamber 54 is formed within the housing 51, and the discharge end of the spark plug 52 is disposed within the second combustion chamber 54. The air duct 53 is in communication with the second combustion chamber 54 and the premixing tank 1, respectively. The jet hole 55 is formed at the end of the housing 51 located within the first combustion chamber 6, and connects the first combustion chamber 6 with the second combustion chamber 54.

[0079] In an illustrative embodiment, Figure 4 As shown, a one-way valve 93 is provided in the air duct 53 to allow the mixed gas to enter the second combustion chamber 54 from the air duct 53 and to limit the gas in the second combustion chamber 54 from being discharged from the air duct 53 .

[0080] According to the embodiments of the present disclosure, Figure 5 As shown, the jet hole 55 includes: a contraction section 551, an expansion section 553 and a throat 552, wherein the contraction section 551 is arranged facing the second combustion chamber 54, the expansion section 553 is arranged facing the first combustion chamber 6, and the throat 552 is arranged between the contraction section 551 and the expansion section 553.

[0081] The radial cross-sectional areas of the contraction section 551 , the expansion section 553 and the throat 552 satisfy the following formula 1 to increase the ejection velocity of the jet hole 55 :

[0082]

[0083] In formula 1, A anyrepresents the cross-sectional area of ​​the expansion section 553; Ac represents the cross-sectional area of ​​the throat 552; Ma any Characterizes the ejection velocity of the jet hole 55; k is the adiabatic index of air.

[0084] In an illustrative embodiment, Figure 5 As shown, in order to meet the requirements of the ejection velocity of the jet hole 55, on the basis that the jet hole 55 satisfies the formula 1, the pressure ratio between the inlet and outlet of the jet hole 55 needs to be set, and needs to satisfy the following formula 2:

[0085]

[0086] In formula 2, P inlet represents the inlet pressure of the jet hole 55; Pe represents the outlet pressure of the jet hole 55; Ma represents the exit velocity of the jet hole 55; k is the adiabatic index of air.

[0087] In an illustrative embodiment, in order to satisfy that the ejection velocity of the jet hole 55 is not less than Mach 1, the above parameters are designed as follows based on the above equations 1 and 2.

[0088] In the case of air with an adiabatic index of 1.4, in order to ensure that the outlet pressure of the jet hole 55 is not less than 0.1 MPa, the inlet pressure of the jet hole 55 must be not less than 0.189 MPa. Under the above pressure conditions, the length L1 of the contraction section 551 is 3 mm, the length L2 of the throat 552 is 3 mm, the length L3 of the expansion section 553 is 4 mm, and the diameter D of the contraction section 551 is 0.189 MPa. inlet is 5 mm, and the diameter Dc of the throat 552 is 3 mm as a preset condition.

[0089] Wherein, assuming Mach 2 as the ejection velocity of the jet hole 55, the corresponding diameter D of the expansion section 553 is outlet It should be understood that the embodiments of the present disclosure are not limited thereto.

[0090] For example, under the above preset conditions, with Mach 1 as the ejection velocity of the jet hole 55, the corresponding diameter D of the expansion section 553 is outlet 3 mm; with Mach 3 as the ejection velocity of the jet hole 55, the corresponding diameter D of the expansion section 553 outlet 6.15 mm; with Mach 4 as the ejection velocity of the jet hole 55, the corresponding diameter D of the expansion section 553 is outlet It is 9.82 mm.

[0091] In an exemplary embodiment, the jet holes 55 are spaced circumferentially around the end of the housing 51 within the first combustion chamber 6, with a number of 6 to 8 being provided. The number and parameter design of the jet holes 55 effectively increases the flame propagation speed, thereby enhancing the turbulence within the first combustion chamber 6. Furthermore, the design of the jet holes 55, which are designed for supersonic speeds exceeding Mach 1, creates a localized high-temperature region below the jet holes 55, enhancing the ignition capability of the fuel.

[0092] According to the embodiments of the present disclosure, Figure 6 As shown, the air intake device further includes a monitoring unit 8, which includes a first monitoring component 81 disposed in the premixing tank 1 and a second monitoring component 82 disposed in the second combustion chamber 54. The first monitoring component 81 is used to monitor the pressure and / or temperature in the premixing tank 1; the second monitoring component 82 is used to monitor the pressure and / or temperature in the second combustion chamber 54.

[0093] In an illustrative embodiment, the first monitoring assembly 81 includes a first temperature sensor 811 and a first pressure sensor 812; the second monitoring assembly 82 includes a second temperature sensor 821 and a second pressure sensor 822. The first and second monitoring assemblies 81 and 82 enable real-time monitoring of the pressure and / or temperature within the premixing tank 1 and the second combustion chamber 54. Since the output pressures of the gas and air sources are known, and the volume of the premixing tank 1 is fixed, the equivalence ratio of the mixed gas suitable for the premixing chamber can be set based on the corresponding parameters.

[0094] Specifically, the intake amount of gas and / or air in the mixed gas is adjusted based on the preset equivalence ratio fuel coefficient / residual fuel coefficient of the mixed gas to achieve precise control of the equivalence ratio of the mixed gas in the premixing chamber. It should be understood that the embodiments of the present disclosure are not limited to this.

[0095] For example, the above-mentioned equivalence ratio may also be calculated using other indirect parameters collected by other collection devices.

[0096] According to the embodiments of the present disclosure, Figure 6 As shown, the air intake device further includes a control unit 7, which includes a solenoid valve 94 and a control unit disposed on the air delivery pipeline between the premix tank 1 and the air source. The control unit is electrically connected to the first monitoring component 81, the second monitoring component 82, and the solenoid valve 94, respectively, to collect signals output by the first monitoring component 81 and the second monitoring component 82, and to control the conduction or disconnection of the air delivery pipeline via the solenoid valve 94.

[0097] In an exemplary embodiment, the gas and air in premix tank 1 can be regulated based on the temperature and / or pressure information collected by the monitoring assembly. The gas source and premix tank 1 are in a normally open state, while the air source and premix tank 1 are connected or closed via solenoid valve 94. The equivalence ratio of the mixed gas in premix tank 1 is adjusted based on the Dalton partial pressure method.

[0098] Figure 7 Schematic diagram of module connections of a combustion system according to an exemplary embodiment of the present disclosure.

[0099] The present disclosure further provides a combustion system, comprising an air intake device, a natural gas storage tank 91, and a compressed air storage tank 96. The natural gas storage tank 91 and the compressed air storage tank 96 are respectively connected to the output end of the premixing drum.

[0100] In an exemplary embodiment, the combustion system includes a piping assembly 9 .

[0101] In an exemplary embodiment, a filter is installed between the compressed air storage tank 96 and the premix tank 1.

[0102] In an illustrative embodiment, the premixing tank 1 maintains a pressure environment condition of 2.5-3 bar, and the compressed air pipe can provide a stable compressed air pressure of 3 bar; when the pressure in the premixing tank 1 is lower than 2.5 bar, the control unit controls the solenoid valve 94 to open, and at the same time calculates the amount of compressed air entering the premixing tank 1 based on the real-time feedback signals of the first temperature sensor 811 and the first pressure sensor 812, and then controls the injection valve 92 installed on the premixing tank 1 to inject a corresponding amount of natural gas according to a preset premixed gas equivalence ratio.

[0103] In an illustrative embodiment, the piston 4 moves upward to compress the mixer in the compressor body 3, so that the gas temperature and pressure in the second combustion chamber 54 continue to increase, and the second temperature sensor 821 and the second pressure sensor 822 monitor the temperature and pressure of the second combustion chamber 54 in real time. The injection valve 92 on the premixing tank 1 sprays the natural gas injection amount of the second combustion chamber 54, which is not less than the amount of gas in the ideal gas state, which is calculated by the ideal gas state formula, so that scavenging is achieved in the second combustion chamber 54.

[0104] According to an embodiment of the present disclosure, the combustion system further includes one-way valves 93 respectively provided on the air delivery pipeline connecting the natural gas storage tank 91 and the premixing tank 1 , and on the air delivery pipeline connecting the compressed air storage tank 96 and the premixing tank 1 .

[0105] In an illustrative embodiment, the piston 4 first descends from the top dead center, and a low equivalence ratio natural gas mixture (0.4-0.9) enters the first combustion chamber 6 through the intake duct 21; when the piston 4 passes the bottom dead center, the intake valve 22 is closed, and in the compression stage in the cylinder, the premixing tank 1 of the air duct 53 connected to the second combustion chamber 54 sprays a high equivalence ratio (1-1.2) mixture into the second combustion chamber 54, and the spark plug 52 ignites the mixture, thereby igniting the uniform mixture in other parts of the second combustion chamber 54; the second combustion chamber 54 generates a higher pressure than the first combustion chamber 6, and under the action of the pressure difference, the jet flame of the second combustion chamber 54 enters the first combustion chamber 6, forming a hot atmosphere with a higher activity fuel at the center of the first combustion chamber 6, forming a distributed ignition, and igniting the fuel in the first combustion chamber 6 with lower activity or lean burn conditions.

[0106] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. An air intake device, comprising: Body (3); A piston (4) is installed in the body (3); A cylinder head (2) is mounted at an opening position of the engine body (3), wherein the cylinder head (2), the engine body (3) and the piston (4) define a first combustion chamber (6); The air intake portion (5) comprises: a second combustion chamber (54) formed in the cylinder head (2) and communicating with the first combustion chamber (6); a housing (51), wherein the second combustion chamber (54) is formed in the housing (51); a spark plug (52) disposed on the housing (51), wherein a discharge end of the spark plug (52) is located in the second combustion chamber (54); An air guide channel (53) is formed on the housing (51), a first end of the air guide channel (53) is in communication with the second combustion chamber (54), and a second end of the air guide channel (53) is in communication with the premixing tank (1); and Jet holes (55) are formed at the end of the housing (51) located in the first combustion chamber (6), and the jet holes (55) are arranged at intervals along the circumference of the end of the housing (51) located in the first combustion chamber (6). The jet holes (55) include: A contraction section (551) is arranged facing the second combustion chamber (54); an expansion section (553), disposed facing the first combustion chamber (6); and a throat (552) disposed between the contraction section (551) and the expansion section (553); The length L1 of the contraction section (551) is 3 mm, the length L2 of the throat (552) is 3 mm, the length L3 of the expansion section (553) is 4 mm, and the diameter D of the contraction section (551) is 1 mm. inlet is 5 mm, the diameter Dc of the throat (552) is 3 mm, and the diameter D of the expansion section (553) is outlet is 3.9 mm. When the adiabatic index of air is 1.4, in order to make the outlet pressure of the jet hole (55) not less than 0.1 MPa, the inlet pressure of the jet hole (55) must be not less than 0.189 MPa, and the jet hole (55) has an exit velocity of Mach 2; and A premixing tank (1), wherein an air inlet end of the premixing tank (1) is connected to an air source and a fuel gas source respectively, and an exhaust end of the premixing tank (1) is connected to the second combustion chamber (54); Air and gas are mixed in the premixing tank (1), and the mixed gas is output to the second combustion chamber (54).

2. The air intake device according to claim 1, further comprising an air intake passage (21) formed in the cylinder head (2), wherein the air intake passage (21) is connected to the fuel gas source.

3. The air intake device according to claim 1, further comprising an injection valve (92) provided on a gas delivery pipeline between the premixing tank (1) and the second combustion chamber (54).

4. The air intake device according to claim 1, wherein: A premixing chamber is formed in the premixing tank (1), and an auxiliary heating component is provided in the premixing chamber.

5. The air intake device according to claim 1, wherein: The jet hole (55) comprises: A contraction section (551) is arranged facing the second combustion chamber (54); an expansion section (553), disposed facing the first combustion chamber (6); and a throat (552) disposed between the contraction section (551) and the expansion section (553); The radial cross-sectional areas of the contraction section (551), the expansion section (553) and the throat (552) satisfy the following formula 1, so as to increase the ejection velocity of the jet hole (55); Formula 1 In formula 1, A any Characterizes the cross-sectional area of ​​the expansion section (553); A C Characterizes the cross-sectional area of ​​the throat (552); Ma any Characterizes the ejection velocity of the jet hole (55); k is the adiabatic index of air.

6. The air intake device according to any one of claims 1 to 5, further comprising a monitoring unit (8), comprising: A first monitoring component (81) is disposed in the premixing tank (1) and is used to monitor the pressure and / or temperature in the premixing tank (1); as well as A second monitoring component (82) is disposed in the second combustion chamber (54) and is used to monitor the pressure and / or temperature in the second combustion chamber (54).

7. The air intake device according to claim 6, further comprising a control unit (7), comprising: a solenoid valve (94), arranged on the air delivery pipeline between the premixing tank (1) and the air source, for realizing the connection or disconnection of the air delivery pipeline; and The control unit is electrically connected to the first monitoring component (81), the second monitoring component (82) and the solenoid valve (94) respectively, and is used to collect signals output by the first monitoring component (81) and the second monitoring component (82), and to control the conduction or disconnection of the solenoid valve (94).

8. A combustion system comprising: The air intake device according to any one of claims 1 to 7; Natural gas storage tanks (91); as well as Compressed air storage tank (96); The output ends of the natural gas storage tank (91) and the compressed air storage tank (96) are respectively connected to the premixing tank (1).

9. The combustion system according to claim 8, further comprising a one-way valve (93) on the gas delivery pipeline connecting the natural gas storage tank (91) and the premixing tank (1) and connecting the compressed air storage tank (96) and the premixing tank (1).

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