A gas mixing pipeline and ammonia-diesel dual-fuel engine

Abstract

The present invention discloses a gas mixing pipeline and an ammonia-diesel dual-fuel engine. The gas mixing pipeline is used for mixing ammonia and air, and includes an inner tube, an outer tube and an ammonia supply pipe. The inner tube has an inner cavity and two openings respectively arranged at both ends of the inner tube and connected to the inner cavity, one of which is used for air to pass through; the outer tube is sleeved on the outside of the inner tube, and a heating channel is restricted between the inner tube and the outer tube; the ammonia supply pipe passes through the inner tube and the outer tube, and is used to connect the ammonia supply device and the inner cavity; wherein the heating channel is used for coolant in the engine to pass through, so as to heat the part of the ammonia supply pipe located in the heating channel. In this solution, ammonia is passed into the ammonia supply pipe, and coolant is filled into the heating channel to heat the part of the ammonia supply pipe located in the heating channel. The temperature of the coolant is higher than the boiling point of ammonia, so as to heat the ammonia in the ammonia supply pipe to prevent liquefaction, so that the ammonia can fully contact with the air and achieve full combustion.

Description

Technical Field

[0001] The invention relates to the technical field of engines, and in particular to a gas mixing pipeline and an ammonia-diesel dual-fuel engine. Background Art

[0002] In the ammonia-diesel dual-fuel engine, the liquid ammonia nozzle is sprayed in the ammonia supply pipeline behind the turbocharger, vaporized into ammonia mixed with air, and the mixed gas enters the cylinder through the intake valve. When the piston reaches the top dead center, diesel is sprayed. The low ignition point of diesel will burn and ignite ammonia, thereby rotating the engine. Good atomization of the fuel and full mixing with air are the prerequisites for full combustion.

[0003] In the ammonia supply pipeline, liquid ammonia vaporizes after passing through the nozzle, and vaporization absorbs heat. Different engine operating conditions require different amounts of ammonia fuel. Long-term vaporization and varying amounts of ammonia fuel will cause the temperature of the ammonia supply pipeline to drop, making fuel and other gases easier to liquefy. In addition, the ammonia nozzle is located in front of the intake valve. After the turbocharger is pressurized, the increase in pressure in the pipeline will cause the boiling point of the ammonia fuel to increase, making it easier to turn into liquid. If the fuel atomization effect is not good, it will enter the cylinder, resulting in incomplete combustion of the fuel, which will bring a variety of harmful effects. Summary of the invention

[0004] The main purpose of the present invention is to provide a gas mixing pipeline, aiming to solve the problem of incomplete fuel combustion in the existing ammonia-diesel dual-fuel engine.

[0005] To achieve the above-mentioned purpose, the present invention proposes a gas mixing pipeline and an ammonia-diesel dual-fuel engine, and particularly relates to a gas mixing pipeline, wherein the gas mixing pipeline comprises: an inner tube, an outer tube and an ammonia supply pipe, the inner tube having an inner cavity and two openings respectively arranged at both ends of the inner tube and connected to the inner cavity, one of the openings being used for allowing air to pass through; the outer tube is sleeved on the outside of the inner tube, and a heating channel is restricted between the inner tube and the outer tube; the ammonia supply pipe passes through the inner tube and the outer tube, and is used to connect the ammonia supply device and the inner cavity; wherein the heating channel is used for allowing coolant in the engine to pass through, so as to heat the portion of the ammonia supply pipe located in the heating channel.

[0006] Optionally, the length of the ammonia supply pipe in the heating channel is at least greater than 25 mm.

[0007] Optionally, the gas mixing pipeline further comprises:

[0008] A flow regulating valve is arranged at one end of the ammonia supply pipe located outside the outer pipe;

[0009] A temperature sensor is fixedly arranged in the heating channel;

[0010] A controller is electrically connected to the flow regulating valve and the temperature sensor.

[0011] Optionally, the gas mixing pipeline includes an electric heating device, the electric heating device includes an electric heating wire, the electric heating wire is wound around the outside of the inner tube, and the electric heating device is electrically connected to the controller.

[0012] Optionally, the gas mixing pipe includes a flow mixing device, which is arranged in the inner cavity. The flow mixer includes a plurality of blades, and the plurality of blades are arranged at intervals along the circumferential direction of the inner tube. The blades are at least partially bent along the circumferential direction of the inner tube and are inclined axially and radially relative to the inner tube.

[0013] Optionally, the flow mixing device is rotatably disposed in the inner tube along the axial direction of the inner tube.

[0014] Optionally, the gas mixing duct guide device is arranged at an opening at one end of the inner tube for allowing the air to pass through, and extends toward the other end of the inner tube, and has a guide channel that penetrates in the same direction as the extension direction, and the guide channel has an injection port located in the inner cavity, and the injection port is arranged corresponding to the connecting port between the ammonia supply pipe and the inner cavity.

[0015] Optionally, the flow guiding device comprises:

[0016] A fixing part, one end of which is fixedly arranged at an opening of the inner tube for air to pass through, and the cross-sectional width in the radial direction of the guide channel is gradually reduced along the extension direction of the guide device;

[0017] The adjusting part includes a plurality of first baffles, which are rotatably arranged at the other end of the fixing part along the tangent direction of the end surface of the fixing part, and are arranged along the circumferential direction of the other end of the fixing part;

[0018] The driving part includes a plurality of connecting rods and a driving rod, wherein one end of the plurality of connecting rods is rotatably connected to the plurality of first baffles respectively, and the other end is used to be rotatably connected to the driving rod, and the driving rod is movably arranged along the extension direction of the inner tube to drive the first baffle to rotate and adjust the opening size of the injection port.

[0019] Optionally, the guide device includes a plurality of second baffles, and avoidance grooves are respectively provided on opposite sides of two adjacent first baffles, and the second baffle is arranged between two adjacent first baffles and is at least partially clamped in the two avoidance grooves.

[0020] The present invention also proposes an ammonia-diesel dual-fuel engine, which includes the above-mentioned gas mixing pipe, and the gas mixing pipe includes: an inner pipe, an outer pipe and an ammonia supply pipe, the inner pipe has an inner cavity and two openings respectively arranged at both ends of the inner pipe and connected to the inner cavity, one of which is used for air to pass through; the outer pipe is sleeved on the outside of the inner pipe, and a heating channel is restricted between the inner pipe and the outer pipe; the ammonia supply pipe passes through the inner pipe and the outer pipe, and is used to connect the ammonia supply device and the inner cavity; wherein the heating channel is used for coolant in the engine to pass through, so as to heat the part of the ammonia supply pipe located in the heating channel.

[0021] In the technical solution provided by the present invention, ammonia is introduced into the ammonia supply pipe and coolant is filled into the heating channel to heat the portion of the ammonia supply pipe located in the heating channel. The temperature of the coolant is higher than the boiling point of ammonia to heat the ammonia in the ammonia supply pipe to prevent liquefaction, so that the ammonia can fully contact with the air and achieve full combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A three-dimensional schematic diagram of an embodiment of a gas mixing pipeline provided by the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of a full cross-section of a gas mixing pipeline;

[0025] Figure 3 for Figure 1 A three-dimensional schematic diagram of a flow guide device for a gas mixing pipeline.

[0026] Description of Figure Numbers:

[0027]

[0028]

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] 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.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] At present, the existing ammonia-diesel dual-fuel engines often have the problem of incomplete fuel combustion.

[0034] In order to solve the above problems, the present invention provides a gas mixing pipeline. Figures 1 to 3 This is a specific embodiment of the gas mixing pipeline provided by the present invention.

[0035] See also Figures 1 to 3 The gas mixing pipeline 100 includes: the gas mixing pipeline 100 is used for mixing ammonia and air, including an inner tube 1, an outer tube 2 and an ammonia supply pipe 4, the inner tube 1 has an inner cavity 11 and two openings respectively arranged at both ends of the inner tube 1 and connected to the inner cavity 11, one of which is used for air to pass through; the outer tube 2 is sleeved on the outside of the inner tube 1, and a heating channel 3 is restricted between the inner tube 1 and the outer tube 2; the ammonia supply pipe 4 passes through the inner tube 1 and the outer tube 2, and is used to connect the ammonia supply device and the inner cavity 11; wherein, the heating channel 3 is used for the coolant in the engine to pass through, so as to heat the part of the ammonia supply pipe 4 located in the heating channel 3.

[0036] In the technical solution provided by the present invention, the gas mixing pipeline 100 includes an inner tube 1 and an outer tube 2, the outer tube 2 is sleeved on the outer side of the inner tube 1, and a heating channel 3 is formed between the inner tube 1 and the outer tube 2. Coolant is introduced into the heating channel 3, and the temperature of the engine coolant is used to heat the part of the ammonia supply pipe 4 located in the heating channel 3. The pressure of ammonia in the ammonia supply pipe 4 is generally less than 3 MPa, and the corresponding maximum boiling point is about minus 10 degrees. The temperature of the coolant needs to be higher than minus 10 degrees, and the ammonia supply pipe 4 is heat exchanged, and the ammonia is further heat exchanged, so that the ammonia continues to absorb heat and maintains a gas state. The outer tube 2 is provided with a coolant inlet and a coolant outlet, so that the coolant is continuously filled, and the problem of poor heating effect after heating for a period of time when the coolant is sealed occurs. Using cooling water for water bath heating is more effective than using resistance wire for heating, and the temperature of the engine cooling water is used to provide heat for the vaporization of liquid ammonia. Prevent gases such as ammonia from re-liquefying and entering the cylinder, causing incomplete combustion, fuel waste, poor emissions, engine jitters, inability to accurately deliver and meter fuel, deterioration of operating conditions and other hazards.

[0037] In order to allow the coolant to have enough time to exchange heat with the ammonia gas, the length of the ammonia supply pipe 4 in the heating channel 3 needs to be long enough, and the ammonia gas can complete the heat exchange with the coolant during the time when the ammonia gas flows through the part of the ammonia supply pipe 4 in the heating channel 3. Generally, the inner diameter of the outer pipe 2 is about 130 mm, the inner diameter of the inner pipe 1 is about 80 mm, and the spacing between the inner pipe 1 and the outer pipe 2 (i.e., the radial width of the heating channel 3) is not less than 25 mm. The spacing between the inner pipe 1 and the outer pipe 2 (i.e., the radial width of the heating channel 3) can be changed by changing the diameters of the inner pipe 1 and the outer pipe 2, thereby changing the length of the ammonia supply pipe 4 in the heating channel 3. In another embodiment, the ammonia supply pipe 4 is tilted, so that the length of the ammonia supply pipe 4 in the heating channel 3 is longer than the length set in the radial direction, and has a better heating effect. Alternatively, the ammonia supply pipe 4 has a portion extending axially along the heating channel 3, wherein the portion extending axially is arranged in the heating channel 3, and the longer the portion extending axially is, the longer the corresponding heating time in the heating channel 3 is. The engine coolant is generally used to prevent the engine temperature from being too high and to cool down the key components of the engine. At this time, the coolant is in an absorbing heat state. If it absorbs heat for a long time, the cooling effect of the coolant will be reduced. In this scheme, the coolant is passed into the heating channel 3 to heat the ammonia gas, which causes the coolant to release heat. The coolant releases heat in the heating channel 3, which reduces the coolant temperature and is beneficial to cooling the key components of the engine. The coolant cools the key components of the engine and absorbs heat, which increases the coolant temperature and is beneficial to heating the ammonia gas.

[0038] In addition, the gas mixing pipeline 100 also includes a control system for adjusting the flow rate of ammonia output from the ammonia supply pipe 4, so that the flow rate of ammonia matches the temperature in the heating channel 3, ensuring that the ammonia can remain in a vaporized state, and a flow regulating valve is arranged at one end of the ammonia supply pipe 4 located outside the outer tube 2, and the flow rate of ammonia is controlled by adjusting the opening size of the flow regulating valve; a temperature sensor is fixedly arranged in the heating channel 3 for detecting the temperature in the heating channel 3; a controller is electrically connected to the flow regulating valve and the temperature sensor. When the temperature sensor sends a temperature signal corresponding to a higher temperature to the controller, the controller will control the flow regulating valve to open a larger opening. When the temperature sensor sends a temperature signal corresponding to a lower temperature to the controller, the controller will control the flow regulating valve to open a smaller opening.

[0039] In order to prevent the temperature provided by the cooling water from being insufficient to keep the ammonia in a gaseous state, the gas mixing pipe 100 is also provided with an electric heating device, which includes an electric heating wire, which is wound around the outside of the inner tube 1, and the electric heating device is electrically connected to the controller. The electric heating wire is wound around the outside of the inner tube 1 to supplement the heat when the cooling water lacks heat. When the engine just starts to work, the cooling water temperature has not yet risen and cannot provide enough heat, the electric heating device is turned on after the temperature sensor feeds back the temperature signal. When the engine is in different working conditions and requires a large amount of ammonia fuel, when the temperature provided by the cooling water is insufficient, electric auxiliary heating can also be used to supplement the heat.

[0040] In order to fully burn ammonia, ammonia and air must be fully mixed. The gas mixing pipeline 100 includes a mixing device 5, which is arranged in the inner cavity 11. The mixer includes a plurality of blades 51, and the plurality of blades 51 are arranged at intervals along the circumferential direction of the inner tube 1. The blades 51 are at least partially bent along the circumferential direction of the inner tube 1 and are inclined relative to the inner tube 1 in the axial and radial directions. The arrangement of the blades 51 enables the gas to rotate and move forward in a spiral shape, which is conducive to the mixing of ammonia and air. If the space of the inner cavity 11 is large enough, the mixing device 5 can also be arranged in a rotatable form, so that the mixing effect is better. Generally, the mixing device 5 is provided with 4 fan blades 51 to increase turbulence and gas rotation, and enter the cylinder after being fully mixed to achieve more complete combustion. Too many fan blades will increase gas resistance, and too few fan blades will cause uneven mixing of gases under different working conditions. Four are the best.

[0041] In order to mix ammonia gas and air as quickly as possible, the gas mixing pipeline 100 has a flow guide device 6, which is arranged at one end opening of the inner tube 1 for air to enter, and extends toward the other end of the inner tube 1, and has a flow guide channel 61 that penetrates in the same direction as the extension direction, and the flow guide channel 61 has an injection port 62 located in the inner cavity 11, and the injection port 62 is arranged corresponding to the connecting port 41 between the ammonia supply pipe 4 and the inner cavity 11. Ammonia gas ejected from the connecting port 41 just collides with the air ejected from the injection port 62 to mix.

[0042] In order to match the flow rate of the ammonia gas introduced with the flow rate of the air introduced, the size of the injection port 62 needs to be adjustable. Specifically, the flow guide device 6 includes a fixing portion 63, an adjusting portion 64 and a driving portion 65. One end of the fixing portion 63 is fixedly arranged at one end opening of the inner tube 1 for air introduction, and the cross-sectional width in the radial direction of the flow guide channel 61 is gradually reduced along the extension direction of the flow guide device 6; the adjusting portion 64 includes a plurality of first baffles 641, which are rotatably arranged at the other end of the fixing portion 63 along the tangent direction of the end surface of the fixing portion 63, and the plurality of first baffles 641 are arranged along the circumferential direction of the other end of the fixing portion 63; the driving portion 65 includes a plurality of connecting rods 651 and a driving rod 652, one end of the plurality of connecting rods 651 is rotatably connected to the plurality of first baffles 641 respectively, and the other end is used to be rotatably connected to the driving rod 652, and the driving rod 652 is movably arranged along the extension direction of the inner tube 1 to drive the first baffle 641 to rotate and adjust the opening size of the injection port 62. The radial cross-sectional width of the guide channel 61 is gradually reduced along the extension direction of the guide device 6 , which makes the gas flow faster, increases kinetic energy and facilitates mixing, and concentrates the air at the injection port 62 to mix with the ammonia.

[0043] The driving rod 652 moves along the extension direction of the inner tube 1, and the rotation of the multiple first baffles 641 is adjusted correspondingly through the multiple connecting rods 651. The rotation of the multiple first baffles 641 can adjust the opening size of the injection port 62. The guide channel 61 is a variable conical section. According to fluid mechanics, under different working conditions, the required ammonia fuel is different, and the air intake amount is different, so different air intake flow rates are designed to achieve a more complete mixing of air and ammonia. When the ammonia fuel required for the engine working condition decreases, the amount of air also decreases accordingly. However, if the air flow rate decreases as a result, it will lead to insufficient mixing of ammonia fuel and air, resulting in low combustion efficiency, poor fuel economy, emission pollution, etc., then the cross-section becomes smaller, the size of the injection port 62 becomes smaller, and the air flow rate is increased, so that the air flow rate flow at this time matches the amount of ammonia fuel at this time to achieve full mixing. When the ammonia fuel required by the engine increases, the amount of air also increases accordingly, then the variable conical section shrinks, the cross-section becomes larger, and the size of the injection port 62 becomes larger. Match the air flow rate flow at this time with the amount of ammonia fuel at this time to ensure that more air is mixed with ammonia fuel. In addition, in order to reduce the obstruction of the driving rod 652 and the multiple connecting rods 651 to the air flow, and the resistance generated by the air to the adjustment of the driving rod 652, the driving rod 652 is set to be hollow, and the air can pass through the inside of the driving rod 652, reducing the cross-sectional area of ​​the end of the driving rod 652 in contact with the air, so as to reduce the resistance encountered by the driving rod 652 when adjusting, and reduce the influence of the driving rod 652 on the air flow. Correspondingly, the smaller the diameter of the multiple connecting rods is, the better, while ensuring the rigidity.

[0044] Since the plurality of first baffles 641 are arranged to rotate, they must ensure that they do not interfere with each other during the rotation process. Therefore, there is a gap between two adjacent first baffles 641 to prevent ammonia from escaping from the gap instead of being sprayed from the injection port 62. Therefore, avoidance grooves are respectively arranged on the opposite sides of the two adjacent first baffles 641. The flow guide device 6 includes a plurality of second baffles 642. The second baffles 642 are arranged between two adjacent first baffles 641 and at least partially clamped in the two avoidance grooves. The larger the injection port 62 is, the larger the gap between the two first baffles 641 is, the larger the area of ​​the second baffle 642 exposed to the gap is, and the smaller the portion used for limiting in the avoidance groove is; the smaller the injection port 62 is, the smaller the gap between the two first baffles 641 is, the smaller the area of ​​the second baffle 642 exposed to the gap is, and the larger the portion used for limiting in the avoidance groove is. The avoidance groove has the function of limiting the second baffle 642 to prevent it from falling off between the two first baffles 641, and preventing the first baffle 641 and the second baffle 642 from interfering with each other when they move relative to each other. It is worth mentioning that the gas mixing pipeline 1 is applied to the ammonia-diesel dual-fuel engine. The internal pipe diameter of the general ammonia-diesel dual-fuel engine is 80-130mm, and there is enough installation space to set the guide device 6. For general small engines, there may be a situation where the internal space of the pipe diameter is small and it is not convenient to install the guide device 6. The gas mixing pipeline 1 and the ammonia-diesel dual-fuel engine in this scheme are mainly used in ship power systems. Under this condition, the ammonia-diesel dual-fuel engine has a large enough space to set the gas mixing pipeline 1 to heat the ammonia in the ammonia supply pipe 4 to prevent liquefaction, so that the ammonia can fully contact with the air and achieve full combustion.

[0045] In addition, the present invention provides an ammonia-diesel dual-fuel engine, which includes a gas mixing pipeline 100. The gas mixing pipeline 100 includes: the gas mixing pipeline 100 is used for mixing ammonia and air, including an inner tube 1, an outer tube 2 and an ammonia supply pipe 4, the inner tube 1 has an inner cavity 11 and two openings respectively arranged at both ends of the inner tube 1 and connected to the inner cavity 11, one of which is used for air to pass through; the outer tube 2 is sleeved on the outer side of the inner tube 1, and a heating channel 3 is limited between the inner tube 1 and the outer tube 2; the ammonia supply pipe 4 passes through the inner tube 1 and the outer tube 2, and is used to connect the ammonia supply device and the inner cavity 11; wherein the heating channel 3 is used for the coolant in the engine to pass through, so as to heat the part of the ammonia supply pipe 4 located in the heating channel 3. The ammonia-diesel dual-fuel engine includes a gas mixing pipeline 100 to solve the problem that long-term vaporization heat absorption will cause the re-formation of liquid ammonia droplets and enter the cylinder, resulting in incomplete combustion, fuel waste, and insufficient power. Specifically, by controlling the size of the flow regulating valve and the electric heating device, the ammonia can be fully absorbed to ensure that it will not liquefy. The existing ammonia-diesel dual-fuel engine in ships heats ammonia by using an additional steam boiler for heating. The present invention uses its own cooling water circulation heating, which is economical, and uses an electric heating device to control the degree of heating, which ensures the vaporization of liquid ammonia to the greatest extent while also ensuring its economy.

[0046] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A gas mixing pipeline for mixing ammonia and air, characterized in that: include: The inner tube has an inner cavity and two openings respectively disposed at two ends of the inner tube and connected to the inner cavity, one of the openings being used for air to flow in; An outer tube is sleeved on the outer side of the inner tube, and a heating channel is defined between the inner tube and the outer tube; an ammonia supply pipe, passing through the inner pipe and the outer pipe, for connecting the ammonia supply device and the inner cavity; the heating channel is used for the coolant in the engine to pass through, so as to heat the part of the ammonia supply pipe located in the heating channel; A flow guide device is provided at an opening at one end of the inner tube for allowing the air to pass through, and extends toward the other end of the inner tube, and has a flow guide channel penetrating in the same direction as the extension direction, and the flow guide channel has an injection port located in the inner cavity, and the injection port is provided corresponding to the communication port between the ammonia supply pipe and the inner cavity; Wherein, the flow-guiding device comprises: a fixing part, an adjusting part and a driving part, one end of the fixing part is fixedly arranged at an opening at one end of the inner tube for air to pass through, and the cross-sectional width in the radial direction of the flow-guiding channel is gradually reduced along the extension direction of the flow-guiding device; the adjusting part comprises a plurality of first baffles, and the plurality of first baffles are rotatably arranged at the other end of the fixing part along the tangent direction of the end face of the fixing part, and the plurality of first baffles are arranged circumferentially along the other end of the fixing part; the driving part comprises a plurality of connecting rods and a driving rod, one end of the plurality of connecting rods is rotatably connected to the plurality of first baffles respectively, and the other end is used for rotatably connecting to the driving rod, and the driving rod is movably arranged along the extension direction of the inner tube to drive the first baffle to rotate and adjust the size of the injection port opening.

2. The gas mixing pipeline according to claim 1, characterized in that: The length of the ammonia supply pipe in the heating channel is at least greater than 25 mm.

3. The gas mixing pipeline according to claim 2, characterized in that: The gas mixing pipeline also includes: A flow regulating valve is arranged at one end of the ammonia supply pipe located outside the outer pipe; A temperature sensor is fixedly arranged in the heating channel; A controller is electrically connected to the flow regulating valve and the temperature sensor.

4. The gas mixing pipeline according to claim 3, characterized in that: The gas mixing pipeline includes an electric heating device, which includes an electric heating wire. The electric heating wire is wound around the outside of the inner tube, and the electric heating device is electrically connected to the controller.

5. The gas mixing pipeline according to claim 1, characterized in that: The gas mixing pipeline includes a flow mixing device, which is arranged in the inner cavity. The flow mixer includes a plurality of blades, which are arranged at intervals along the circumferential direction of the inner tube. The blades are at least partially bent along the circumferential direction of the inner tube and are inclined relative to the axial and radial directions of the inner tube.

6. The gas mixing pipeline according to claim 5, characterized in that: The flow mixing device is rotatably arranged in the inner tube along the axial direction of the inner tube.

7. The gas mixing pipeline according to claim 1, characterized in that: The guide device includes a plurality of second baffles, and avoidance grooves are respectively arranged on opposite sides of two adjacent first baffles. The second baffle is arranged between two adjacent first baffles and is at least partially clamped in the two avoidance grooves.

8. An ammonia-diesel dual-fuel engine, characterized in that: Comprising a gas mixing pipeline as described in any one of claims 1 to 7.

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