Ammonia-hydrogen fusion engine system and control method thereof

Abstract

The invention belongs to the technical field of clean energy, and particularly relates to an ammonia-hydrogen fusion engine system and a control method thereof.The ammonia-hydrogen fusion engine system comprises an engine, a liquid ammonia vaporization device and an ammonia reaction hydrogen production device, the engine is provided with an intake manifold and an exhaust manifold, and the exhaust manifold penetrates through the ammonia reaction hydrogen production device; the liquid ammonia vaporization device is communicated with the ammonia reaction hydrogen production device through a first pipeline and is communicated with the intake manifold through a second pipeline, and the second pipeline is communicated with the first pipeline so as to convey ammonia gas to the ammonia reaction hydrogen production device and the intake manifold respectively; and a gasoline injector is further arranged on the intake manifold, and when the water temperature of the engine is smaller than a first temperature threshold value or the temperature of a catalyst in the ammonia reaction hydrogen production device is smaller than a second temperature threshold value, the gasoline injector is used for injecting gasoline into the intake manifold so as to start the engine. The cold start problem of the engine can be solved, and the ignition reliability is improved.

Description

Technical Field

[0001] The present application relates to the field of clean energy technology, and more specifically, to an ammonia-hydrogen fusion engine system and a control method thereof. Background Art

[0002] With the development of industry, people pay more and more attention to environmental protection, and the use and research of various clean energy sources have gradually been carried out. Among them, hydrogen energy is widely used as an efficient and environmentally friendly green energy. However, the storage and transportation of hydrogen energy and the cost of the supply chain have always been one of the troublesome factors in the development of hydrogen energy. Ammonia is a bulk inorganic compound that is easy to transport and store after liquefaction, and ammonia is a carbon-free, hydrogen-rich energy carrier. Therefore, the ammonia-hydrogen fusion engine system produces hydrogen as fuel by decomposing ammonia, which has become a technical solution with good economic benefits and sustainable development.

[0003] However, when the water temperature of the engine or the temperature of the ammonia reaction hydrogen production device is low, for example, after being shut down at night in cold seasons, it generally takes a long time to cold-start the engine again, and the ignition reliability is poor. Summary of the invention

[0004] The purpose of the present application is to provide an ammonia-hydrogen fusion engine system and a control method thereof, which can solve the cold start problem of the engine and improve the reliability of ignition.

[0005] In a first aspect, an embodiment of the present application provides an ammonia-hydrogen fusion engine system, including an engine, a liquid ammonia vaporization device and an ammonia reaction hydrogen production device, the liquid ammonia vaporization device is used to vaporize liquid ammonia into ammonia gas, the engine has an intake manifold and an exhaust manifold, the exhaust manifold runs through the ammonia reaction hydrogen production device, the interior of the ammonia reaction hydrogen production device is filled with a catalyst, the liquid ammonia vaporization device is connected to the ammonia reaction hydrogen production device through a first pipeline, and is connected to the intake manifold through a second pipeline, and the second pipeline is connected to the first pipeline to respectively deliver ammonia gas to the ammonia reaction hydrogen production device and the intake manifold, the ammonia reaction hydrogen production device is provided with a temperature sensor for detecting the temperature of the catalyst; the intake manifold is also provided with a gasoline injector, when the water temperature of the engine is lower than the first temperature threshold or the temperature of the catalyst detected by the temperature sensor is lower than the second temperature threshold, the gasoline injector is used to inject gasoline into the intake manifold to start the engine.

[0006] In addition, the ammonia-hydrogen fusion engine according to the present application may also have the following additional technical features:

[0007] In some embodiments of the present application, a first valve and a first injection valve are provided on the second pipeline. When the first valve is opened, the first injection valve is used to inject ammonia into the intake manifold.

[0008] In some embodiments of the present application, the ammonia reaction hydrogen production device is connected to the intake manifold through a third pipeline. When the ammonia in the ammonia reaction hydrogen production device is decomposed into hydrogen and nitrogen, the hydrogen and nitrogen are transported to the intake manifold through the third pipeline.

[0009] In some embodiments of the present application, a heat exchanger and a filter are sequentially arranged on the third pipeline along the direction from the ammonia reaction hydrogen production device to the intake manifold. The heat exchanger is used to perform heat exchange with the hydrogen and nitrogen entering the third pipeline, and the filter is used to filter impurities in the hydrogen and nitrogen.

[0010] In some embodiments of the present application, a second valve and a second injection valve are also provided on the third pipeline. When the second valve is opened, the second injection valve is used to inject hydrogen and nitrogen into the intake manifold.

[0011] In some embodiments of the present application, the ammonia-hydrogen fusion engine system also includes a heater and a post-treatment device. The ammonia reaction hydrogen production device includes a reaction chamber for accommodating ammonia and a catalyst. The heater is used to heat the reaction chamber. The exhaust manifold passes through the outside of the reaction chamber and is connected to the post-treatment device.

[0012] In some embodiments of the present application, the liquid ammonia vaporization device includes a liquid ammonia tank, a liquid ammonia pump and a liquid ammonia vaporizer. The liquid ammonia tank is connected to the liquid ammonia vaporizer through the liquid ammonia pump, and the cooling water of the engine is connected to the liquid ammonia vaporizer through a fourth pipeline for heat exchange with the liquid ammonia in the liquid ammonia vaporizer. A control valve is provided on the fourth pipeline.

[0013] In the second aspect, an embodiment of the present application provides a control method for an ammonia-hydrogen fusion engine system, which is applied to the ammonia-hydrogen fusion engine system of each embodiment of the present application, and the control method includes: obtaining the water temperature of the engine or the temperature of the catalyst in the ammonia reaction hydrogen production device; when the water temperature of the engine is lower than a first temperature threshold or the temperature of the catalyst is lower than a second temperature threshold, controlling the gasoline injector to spray gasoline into the intake manifold of the engine to start the engine.

[0014] In some embodiments of the present application, a liquid ammonia vaporization device of an ammonia-hydrogen fusion engine system is connected to an intake manifold of the engine through a second pipeline, a first valve and a first injection valve are provided on the second pipeline, an ammonia reaction hydrogen production device is connected to the intake manifold through a third pipeline, a second valve and a second injection valve are also provided on the third pipeline, and a control method of the ammonia-hydrogen fusion engine system further includes: according to the water temperature of the engine being greater than or equal to the first temperature threshold and the temperature of the catalyst being less than the second temperature threshold, controlling the first valve to open, and injecting ammonia into the intake manifold through the first injection valve, so that the engine enters an ammonia and gasoline mixed combustion mode.

[0015] In some embodiments of the present application, when the temperature of the catalyst is greater than or equal to the second temperature threshold, the ammonia in the ammonia reaction hydrogen production device is decomposed into hydrogen and nitrogen, and the control method of the ammonia-hydrogen fusion engine system also includes: according to the water temperature of the engine being greater than or equal to the first temperature threshold and the temperature of the catalyst being greater than or equal to the second temperature threshold, closing the gasoline injector, controlling the second valve to open, and injecting hydrogen and nitrogen into the intake manifold through the second injection valve, so that the engine enters a mixed combustion mode of ammonia and hydrogen and nitrogen.

[0016] According to the ammonia-hydrogen fusion engine system and control method thereof provided in the embodiment of the present application, by arranging a gasoline injector on the intake manifold of the engine, when the water temperature of the engine is lower than a first temperature threshold or the temperature of the catalyst in the ammonia reaction hydrogen production device is lower than a second temperature threshold, the gasoline injector is used to inject gasoline into the intake manifold to start the engine, thereby solving the cold start problem of the engine and improving the reliability of ignition.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them:

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them:

[0020] Figure 1 This is a schematic structural diagram of an ammonia-hydrogen fusion engine system according to an embodiment of the present application;

[0021] Figure 2 for Figure 1 A partial structural schematic diagram of an ammonia-hydrogen fusion engine system is shown;

[0022] Figure 3 This is a flowchart of a control method for an ammonia-hydrogen fusion engine system according to an embodiment of the present application.

[0023] The reference numerals in the accompanying drawings represent the following:

[0024] 100. Ammonia-hydrogen fusion engine system;

[0025] 10. Gasoline injector; 20. Engine; 21. Intake manifold; 22. Exhaust manifold; 201. Cylinder block; 202. Piston; 203. Intake duct; 204. Exhaust duct; 205. Spark plug; 206. Cylinder head;

[0026] 30. Liquid ammonia vaporization device; 31. Liquid ammonia tank; 32. Liquid ammonia pump; 33. Liquid ammonia vaporizer;

[0027] 40. Ammonia reaction hydrogen production device; 41. Heat exchanger; 42. Filter; 43. First valve; 44. First injection valve; 45. Second valve; 46. Second injection valve; 47. Heater; 48. Post-processing device; 49. Temperature sensor;

[0028] a, first pipeline; b, second pipeline; c, third pipeline; d, fourth pipeline. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0030] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0031] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0032] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] Figure 1This is a schematic diagram of the structure of the ammonia-hydrogen fusion engine system according to an embodiment of the present application. Figure 2 for Figure 1 A schematic diagram of the partial structure of the ammonia-hydrogen fusion engine system is shown.

[0036] See also Figure 1 and Figure 2 The embodiment of the present application provides an ammonia-hydrogen fusion engine system 100 , including an engine 20 , a liquid ammonia vaporization device 30 , and an ammonia reaction hydrogen production device 40 .

[0037] The liquid ammonia vaporizing device 30 is used to vaporize liquid ammonia into ammonia gas. The engine 20 has an intake manifold 21 and an exhaust manifold 22. The exhaust manifold 22 runs through the ammonia reaction hydrogen production device 40. The interior of the ammonia reaction hydrogen production device 40 is filled with a catalyst. The liquid ammonia vaporizing device 30 is connected to the ammonia reaction hydrogen production device 40 through a first pipeline a, and is connected to the intake manifold 21 through a second pipeline b. The second pipeline b is connected to the first pipeline a to respectively transport ammonia gas to the ammonia reaction hydrogen production device 40 and the intake manifold 21. A temperature sensor 49 for detecting the temperature of the catalyst is provided on the ammonia reaction hydrogen production device 40.

[0038] A gasoline injector 10 is also provided on the intake manifold 21 . When the water temperature of the engine 20 is lower than a first temperature threshold or the temperature of the catalyst detected by the temperature sensor 49 is lower than a second temperature threshold, the gasoline injector 10 is used to inject gasoline into the intake manifold 21 to start the engine 20 .

[0039] In this embodiment, the engine 20 includes a cylinder body 201, a piston 202 located in the cylinder body 201, and a cylinder head 206 covering the cylinder body 201. An inner cylinder is formed between the cylinder body 201 and the cylinder head 206. A spark plug 205 is provided on the cylinder head 206 near the compression top dead center of the engine 20, and one end of the spark plug 205 faces the inner cylinder. The cylinder head 206 is also provided with at least one intake passage 203 and at least one exhaust passage 204 located on both sides of the spark plug 205. The intake passage 203 and the exhaust passage 204 are respectively connected to the inner cylinder. The intake passage 203 is also connected to the intake manifold 21, and the exhaust passage 204 is also connected to the exhaust manifold 22. The engine 20 also includes necessary engine components such as a camshaft, intake and exhaust valves, a crankshaft, and a piston connecting rod. The piston 202 reciprocates along the axial direction of the cylinder body 201. When the piston 202 moves to near the top dead center of compression, the spark plug 205 is used to ignite the mixed gas in the cylinder. The mixed gas includes ammonia, hydrogen, nitrogen, air, etc., and the combustion chemical energy of the fuel is converted into mechanical energy of the engine to provide power for the engine 20.

[0040] When the temperature of the catalyst in the ammonia reaction hydrogen production device 40 is low or the temperature of the cooling water discharged from the engine 20 is low, for example, after stopping at night in cold seasons, it generally takes a long time to restart the engine to cold start, and the ignition reliability is poor. For this reason, in the embodiment of the present application, a gasoline injector 10 is also provided on the intake manifold 21 of the engine 20. When the water temperature of the engine 20 is less than the first temperature threshold or the temperature of the catalyst detected by the temperature sensor 49 is less than the second temperature threshold, the first temperature threshold may be, for example, 70°C, and the second temperature threshold may be, for example, 350°C. During the intake stroke of the internal combustion engine, the gasoline injector 10 is used to spray gasoline into the intake manifold 21, and the mixed gas of gasoline and air is sequentially passed from the intake manifold 21 and the intake passage 203 into the inner cylinder, and the piston 202 reciprocates along the axial direction of the cylinder body 201. When the piston 202 moves to near the compression top dead center, the spark plug 205 is used to ignite the mixed gas in the cylinder, and the combustion chemical energy of the fuel is converted into the mechanical energy of the engine, so that the engine 20 can be started quickly and effectively.

[0041] It is understandable that the first temperature threshold and the second temperature threshold may also be other temperature values ​​respectively, depending on the specific application scenario, which will not be elaborated herein.

[0042] The liquid ammonia vaporization device 30 is used to vaporize liquid ammonia into ammonia gas, and the ammonia gas is supplied to the ammonia reaction hydrogen production device 40 through the first pipeline a. The interior of the ammonia reaction hydrogen production device 40 is filled with a catalyst, such as a ruthenium-based catalyst. After the engine 20 is started, the exhaust gas generated after combustion is discharged through the exhaust duct 204 and the exhaust manifold 22. Since the exhaust manifold 22 runs through the ammonia reaction hydrogen production device 40, the heat of the exhaust gas discharged by the exhaust manifold 22 can be fully utilized to heat the ammonia reaction hydrogen production device 40, so that the catalyst in the ammonia reaction hydrogen production device 40 reaches the required temperature. After the catalyst reaches the required temperature, the ammonia gas can be decomposed faster and more completely to generate hydrogen, nitrogen or hydrogen-nitrogen gas under the action of the catalyst.

[0043] According to the ammonia-hydrogen fusion engine system 100 provided in the embodiment of the present application, by arranging a gasoline injector 10 on the intake manifold 21 of the engine 20, when the water temperature of the engine 20 is lower than the first temperature threshold or the temperature of the catalyst in the ammonia reaction hydrogen production device 40 is lower than the second temperature threshold, the gasoline injector 10 is used to inject gasoline into the intake manifold 21 to start the engine 20, thereby solving the cold start problem of the engine and improving the reliability of ignition.

[0044] In some embodiments, a first valve 43 and a first injection valve 44 are disposed on the second pipeline b. When the first valve 43 is opened, the first injection valve 44 is used to inject ammonia into the intake manifold 21 .

[0045] like Figure 1As shown, the ammonia generated by the liquid ammonia vaporization device 30 is also connected to the intake manifold 21 through the second pipeline b, so that the inner cylinder of the engine 20 is filled with a mixture of ammonia and gasoline. When the water temperature of the engine 20 is greater than or equal to the first temperature threshold (for example, 70°C) and the temperature of the catalyst is less than the second temperature threshold (for example, 350°C), the first valve 43 on the second pipeline b is opened, and ammonia is sprayed into the intake manifold 21 through the first injection valve 44, so that the engine 20 enters the ammonia and gasoline mixed combustion mode. Under constant load conditions, the amount of gasoline sprayed into the intake manifold 21 by the first injection valve 44 can be gradually reduced to reduce fuel costs.

[0046] In some embodiments, the ammonia reaction hydrogen production device 40 is connected to the intake manifold 21 through the third pipeline c. When the ammonia gas in the ammonia reaction hydrogen production device 40 is decomposed into hydrogen and nitrogen, the hydrogen and nitrogen are transported to the intake manifold 21 through the third pipeline c.

[0047] like Figure 1 As shown, the ammonia reaction hydrogen production device 40 is connected to the intake manifold 21 through the third pipeline c. When the temperature of the catalyst is greater than or equal to the second temperature threshold, the ammonia in the ammonia reaction hydrogen production device 40 is decomposed into hydrogen and nitrogen. The second temperature threshold can be, for example, 350°C. When the temperature of the catalyst is greater than or equal to 350°C, more than 90% of the ammonia can be decomposed into hydrogen and nitrogen, and the hydrogen and nitrogen are transported to the intake manifold 21 through the third pipeline c. At this time, the gasoline injector 10 is closed, so that the inner cylinder of the engine 20 is filled with a mixture of ammonia and hydrogen and nitrogen, so that the engine 20 enters a mixed combustion mode of ammonia and hydrogen and nitrogen.

[0048] In addition, after the liquid ammonia vaporization device 30 vaporizes the liquid ammonia into ammonia gas, the ammonia gas is directly introduced into the intake manifold 21 through the second pipeline b. Since there is no limit on the amount of ammonia gas mixed into the intake manifold 21, carbon reduction combustion can be maximized to achieve zero carbon emissions.

[0049] In some embodiments, a heat exchanger and a filter are sequentially arranged on the third pipeline along the direction from the ammonia reaction hydrogen production device 40 to the intake manifold 21. The heat exchanger is used for heat exchange with the hydrogen and nitrogen entering the third pipeline, and the filter is used for filtering impurities in the hydrogen and nitrogen.

[0050] like Figure 2As shown, the heat exchanger 41 is arranged on the third pipeline c, and is used to perform heat exchange with the hydrogen and nitrogen entering the third pipeline c to cool down the high-temperature hydrogen and nitrogen. The cooled hydrogen and nitrogen can protect the various components on the third pipeline c from being damaged due to excessive temperature. The heat exchanger 41 can be an air heat exchange device or a coolant heat exchange device. Optionally, the ammonia hydrogen fusion engine system 100 also includes a liquid supply device, which includes an inlet pipe and an outlet pipe that are interconnected. The heat exchanger 41 has an inlet and an outlet. The inlet pipe is connected to the inlet, and the outlet pipe is connected to the outlet. The heat exchanger 41 performs heat exchange with the hydrogen and nitrogen entering the third pipeline c through a coolant. The coolant can be water, oil, etc., to cool down the high-temperature hydrogen and nitrogen. The filter 42 is located on the third pipeline c between the heat exchanger 41 and the intake manifold 21 and is used to filter impurities in the hydrogen and nitrogen gases. The filtered hydrogen and nitrogen gases are input into the intake manifold 21 to improve the combustion effect of the mixed gas in the engine 20 .

[0051] In some embodiments, a second valve 45 and a second injection valve 46 are further provided on the third pipeline c. When the second valve 45 is opened, the second injection valve 46 is used to inject hydrogen and nitrogen into the intake manifold 21 .

[0052] like Figure 2 As shown, when the temperature of the catalyst is greater than or equal to the second temperature threshold, the gasoline injector 10 is closed, the second valve 45 and the first valve 43 are opened at the same time, and hydrogen nitrogen and ammonia are respectively sprayed into the intake manifold 21 through the second injection valve 46 and the first injection valve 44, so that the engine 20 enters the ammonia and hydrogen nitrogen mixed combustion mode.

[0053] In some embodiments, the ammonia-hydrogen fusion engine system 100 also includes a heater 47 and a post-treatment device 48. The ammonia reaction hydrogen production device 40 includes a reaction chamber for accommodating ammonia and a catalyst. The heater 47 is used to heat the reaction chamber. The exhaust manifold 22 passes through the outside of the reaction chamber and is connected to the post-treatment device 48.

[0054] like Figure 2 As shown, in the process of catalytic decomposition reaction, in order to make full use of the heat energy of the combustion exhaust gas of the engine 20 and reduce the impact of the nitrogen oxides and unburned ammonia products in the gas discharged from the engine 20 on the environment, the exhaust manifold 22 of the engine 20 is passed through the outside of the reaction chamber and connected to the post-treatment device 48. The heat of the exhaust gas is transferred to the reaction chamber through the exhaust manifold 22, increasing the temperature of the catalyst in the reaction chamber and improving the conversion rate of ammonia to hydrogen. The post-treatment device 48 can process nitrogen oxides and unburned ammonia products in the tail body discharged from the engine 20, so that the exhaust gas of the engine 20 meets the emission standards.

[0055] In some embodiments, the liquid ammonia vaporization device 30 includes a liquid ammonia tank 31, a liquid ammonia pump 32 and a liquid ammonia vaporizer 33. The liquid ammonia tank 31 is connected to the liquid ammonia vaporizer 33 through the liquid ammonia pump 32. The cooling water of the engine 20 is connected to the liquid ammonia vaporizer 33 through the fourth pipeline d for heat exchange with the liquid ammonia in the liquid ammonia vaporizer 33. A control valve is provided on the fourth pipeline d.

[0056] like Figure 1 As shown, the liquid ammonia tank 31 is connected to the liquid ammonia vaporizer 33 through the liquid ammonia pump 32 to convert liquid ammonia into gaseous ammonia. When the engine 20 is running stably, the temperature of the cooling water discharged by the engine 20 can reach above 90°C. In order to further utilize the cooling water of the engine 20 and improve the energy recycling rate of the system, as an optional embodiment of the present application, the cooling water of the engine 20 is connected to the liquid ammonia vaporizer 33 through the fourth pipeline d, which is used to exchange heat with the liquid ammonia in the liquid ammonia vaporizer 33. The cooling water of the engine 20 flows through the liquid ammonia vaporizer 33 to vaporize the liquid ammonia. A control valve is provided between the engine 20 and the liquid ammonia vaporizer 33, and the control valve can be opened or closed as needed.

[0057] Figure 3 This is a flowchart of a control method for an ammonia-hydrogen fusion engine system according to an embodiment of the present application.

[0058] See also Figure 3 The embodiment of the present application also provides a control method of an ammonia-hydrogen fusion engine system, which is applied to the ammonia-hydrogen fusion engine system 100 as described above. The control method includes:

[0059] Step S1: obtaining the water temperature of the engine 20 or the temperature of the catalyst in the ammonia reaction hydrogen production device 40;

[0060] Step S2 : when the water temperature of the engine 20 is lower than the first temperature threshold or the temperature of the catalyst is lower than the second temperature threshold, the gasoline injector 10 is controlled to inject gasoline into the intake manifold 21 of the engine 20 to start the engine 20 .

[0061] Combination Figure 1 and Figure 2, when the temperature of the catalyst in the ammonia reaction hydrogen production device 40 is low or the temperature of the cooling water discharged from the engine 20 is low, for example, after stopping at night in cold seasons, it generally takes a long time to restart the engine to cold start, and the ignition reliability is poor. For this reason, in the embodiment of the present application, a gasoline injector 10 is also provided on the intake manifold 21 of the engine 20. When the water temperature of the engine 20 is less than the first temperature threshold or the temperature of the catalyst detected by the temperature sensor 49 is less than the second temperature threshold, the first temperature threshold may be, for example, 70°C, and the second temperature threshold may be, for example, 350°C. During the intake stroke of the internal combustion engine, the gasoline injector 10 is controlled to spray gasoline into the intake manifold 21 of the engine 20. The mixed gas of gasoline and air is sequentially passed into the inner cylinder from the intake manifold 21 and the intake passage 203. The piston 202 reciprocates along the axial direction of the cylinder body 201. When the piston 202 moves to near the compression top dead center, the spark plug 205 is used to ignite the mixed gas in the cylinder, and the combustion chemical energy of the fuel is converted into the mechanical energy of the engine, so that the engine 20 can be started quickly and effectively.

[0062] In some embodiments, the liquid ammonia vaporization device 30 of the ammonia-hydrogen fusion engine system 100 is connected to the intake manifold 21 of the engine 20 through the second pipeline b, and the second pipeline b is provided with a first valve 43 and a first injection valve 44. The ammonia reaction hydrogen production device 40 is connected to the intake manifold 21 through the third pipeline c, and the third pipeline c is also provided with a second valve 45 and a second injection valve 46. The control method of the ammonia-hydrogen fusion engine system also includes:

[0063] Step S3: Based on the water temperature of the engine 20 being greater than or equal to the first temperature threshold and the temperature of the catalyst being less than the second temperature threshold, the first valve 43 is controlled to open, and ammonia is sprayed into the intake manifold 21 through the first injection valve 44, so that the engine 20 enters an ammonia and gasoline mixed combustion mode.

[0064] like Figure 1 and Figure 2 As shown, the ammonia generated by the liquid ammonia vaporization device 30 is also connected to the intake manifold 21 through the second pipeline b, so that the inner cylinder of the engine 20 is filled with a mixture of ammonia and gasoline. When the water temperature of the engine 20 is greater than or equal to the first temperature threshold (for example, 70°C) and the temperature of the catalyst is less than the second temperature threshold (for example, 350°C), the first valve 43 on the second pipeline b is opened, and ammonia is sprayed into the intake manifold 21 through the first injection valve 44, so that the engine 20 enters the ammonia and gasoline mixed combustion mode. Under constant load conditions, the amount of gasoline sprayed into the intake manifold 21 can be gradually reduced to reduce fuel costs.

[0065] In some embodiments, when the temperature of the catalyst is greater than or equal to the second temperature threshold, the ammonia in the ammonia reaction hydrogen production device is decomposed into hydrogen and nitrogen, and the control method of the ammonia-hydrogen fusion engine system further includes:

[0066] Step S4: Based on the water temperature of the engine 20 being greater than or equal to the first temperature threshold and the temperature of the catalyst being equal to or higher than the second temperature threshold, the gasoline injector 10 is closed, the second valve 45 is controlled to open, and hydrogen and nitrogen are sprayed into the intake manifold 21 through the second injection valve 46, so that the engine 20 enters a mixed combustion mode of ammonia and hydrogen and nitrogen.

[0067] like Figure 1 and Figure 2 As shown, when the temperature of the catalyst is greater than or equal to the second temperature threshold, the ammonia in the ammonia reaction hydrogen production device 40 is decomposed into hydrogen and nitrogen. The second temperature threshold can be, for example, 350°C. When the temperature of the catalyst is greater than or equal to 350°C, more than 90% of the ammonia can be decomposed into hydrogen and nitrogen, and the hydrogen and nitrogen are transported to the intake manifold 21 through the third pipeline c. At this time, the gasoline injector 10 is closed, so that the inner cylinder of the engine 20 is filled with a mixture of ammonia and hydrogen and nitrogen, so that the engine 20 enters a mixed combustion mode of ammonia and hydrogen and nitrogen.

[0068] In addition, after the liquid ammonia vaporization device 30 vaporizes the liquid ammonia into ammonia gas, the ammonia gas is directly passed through the second pipeline b to the intake manifold 21. Since there is no limit on the amount of ammonia gas mixed into the intake manifold 21, carbon reduction combustion can be maximized to achieve zero carbon emissions.

[0069] According to the control method of the ammonia-hydrogen fusion engine system provided in the embodiment of the present application, by setting a gasoline injector 10 on the intake manifold 21 of the engine 20, when the water temperature of the engine 20 is lower than the first temperature threshold or the temperature of the catalyst in the ammonia reaction hydrogen production device 40 is lower than the second temperature threshold, the gasoline injector 10 is used to inject gasoline into the intake manifold 21 to start the engine 20, thereby solving the cold start problem of the engine and improving the reliability of ignition.

[0070] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An ammonia hydrogen fusion engine system, characterized in that: The invention comprises an engine, a liquid ammonia vaporizing device and an ammonia reaction hydrogen production device, wherein the liquid ammonia vaporizing device is used to vaporize liquid ammonia into ammonia gas, the engine has an intake manifold and an exhaust manifold, the exhaust manifold runs through the ammonia reaction hydrogen production device, the interior of the ammonia reaction hydrogen production device is filled with a catalyst, the liquid ammonia vaporizing device is connected to the ammonia reaction hydrogen production device through a first pipeline, and is connected to the intake manifold through a second pipeline, and the second pipeline is connected to the first pipeline, so as to respectively deliver ammonia gas to the ammonia reaction hydrogen production device and the intake manifold, and the ammonia reaction hydrogen production device is provided with a temperature sensor for detecting the temperature of the catalyst; The intake manifold is also provided with a gasoline injector, and when the water temperature of the engine is lower than a first temperature threshold or the temperature of the catalyst detected by the temperature sensor is lower than a second temperature threshold, the gasoline injector is used to inject gasoline into the intake manifold to start the engine.

2. The ammonia-hydrogen fusion engine system according to claim 1, characterized in that: The second pipeline is provided with a first valve and a first injection valve. When the first valve is opened, the first injection valve is used to inject ammonia into the intake manifold.

3. The ammonia-hydrogen fusion engine system according to claim 1, characterized in that: The ammonia reaction hydrogen production device is connected to the intake manifold through a third pipeline. When ammonia gas in the ammonia reaction hydrogen production device is decomposed into hydrogen and nitrogen gas, the hydrogen and nitrogen gas are transported to the intake manifold through the third pipeline.

4. The ammonia-hydrogen fusion engine system according to claim 3, characterized in that: Along the direction from the ammonia reaction hydrogen production device to the intake manifold, a heat exchanger and a filter are sequentially arranged on the third pipeline, the heat exchanger is used for heat exchange with the hydrogen and nitrogen entering the third pipeline, and the filter is used for filtering impurities in the hydrogen and nitrogen.

5. The ammonia-hydrogen fusion engine system according to claim 4, characterized in that: The third pipeline is also provided with a second valve and a second injection valve. When the second valve is opened, the second injection valve is used to inject the hydrogen and nitrogen into the intake manifold.

6. The ammonia-hydrogen fusion engine system according to any one of claims 1 to 5, characterized in that: The ammonia-hydrogen fusion engine system also includes a heater and a post-treatment device. The ammonia reaction hydrogen production device includes a reaction chamber for accommodating ammonia and a catalyst. The heater is used to heat the reaction chamber. The exhaust manifold passes through the outside of the reaction chamber and is connected to the post-treatment device.

7. The ammonia-hydrogen fusion engine system according to claim 1, characterized in that: The liquid ammonia vaporization device includes a liquid ammonia tank, a liquid ammonia pump and a liquid ammonia vaporizer. The liquid ammonia tank is connected to the liquid ammonia vaporizer through the liquid ammonia pump. The cooling water of the engine is connected to the liquid ammonia vaporizer through a fourth pipeline for heat exchange with the liquid ammonia in the liquid ammonia vaporizer. A control valve is provided on the fourth pipeline.

8. A control method for an ammonia-hydrogen fusion engine system, applied to the ammonia-hydrogen fusion engine system according to any one of claims 1 to 7, characterized in that: The control method comprises: Obtaining the water temperature of the engine or the temperature of the catalyst in the ammonia reaction hydrogen production device; When the water temperature of the engine is less than a first temperature threshold or the temperature of the catalyst is less than a second temperature threshold, the gasoline injector is controlled to inject gasoline into the intake manifold of the engine to start the engine.

9. The control method of the ammonia-hydrogen fusion engine system according to claim 8, characterized in that: The liquid ammonia vaporization device of the ammonia-hydrogen fusion engine system is connected to the intake manifold of the engine through a second pipeline, and a first valve and a first injection valve are arranged on the second pipeline. The ammonia reaction hydrogen production device is connected to the intake manifold through a third pipeline, and a second valve and a second injection valve are also arranged on the third pipeline. The control method also includes: Based on the water temperature of the engine being greater than or equal to the first temperature threshold and the temperature of the catalyst being less than the second temperature threshold, the first valve is controlled to open, and ammonia is sprayed into the intake manifold through the first injection valve, so that the engine enters an ammonia and gasoline mixed combustion mode.

10. The control method of the ammonia-hydrogen fusion engine system according to claim 9, characterized in that: When the temperature of the catalyst is greater than or equal to the second temperature threshold, the ammonia in the ammonia reaction hydrogen production device is decomposed into hydrogen and nitrogen, and the control method further includes: According to the water temperature of the engine being greater than or equal to the first temperature threshold and the temperature of the catalyst being greater than or equal to the second temperature threshold, the gasoline injector is closed, the second valve is controlled to open, and hydrogen and nitrogen are sprayed into the intake manifold through the second injection valve, so that the engine enters a mixed combustion mode of ammonia and hydrogen and nitrogen.

Images