Tail gas utilization system and method for improving combustion efficiency of rotor engine

Abstract

The invention provides a tail gas utilization system and method for improving the combustion efficiency of a rotor engine, and belongs to the technical field of internal combustion engines. The tail gas filtering and distributing device is connected to a tail gas outlet of the rotor engine and used for separating tail gas into unburned fuel and high-temperature gas. Unburned fuel flows back to an engine air inlet system through the first pipeline; high-temperature gas is divided into two branches through the second pipeline, the first branch enters the supercharging device, and the second branch enters the fuel oil temperature increasing device; the supercharging device supercharges the high-temperature gas, and the supercharged high-temperature gas enters an engine gas inlet system; the fuel oil temperature increasing device increases the temperature of fuel oil through high-temperature gas, and the fuel oil after being heated is sprayed into the rotor engine through the oil sprayer. According to the invention, through cyclic utilization of tail gas, full recovery of unburned fuel, realization of intake pressurization and improvement of the fuel oil temperature, the combustion efficiency of the rotor engine is obviously improved, the emission of the unburned fuel is reduced, and the environmental pollution is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of internal combustion engines, and in particular to an exhaust gas recycling system for a rotary engine, which aims to improve combustion efficiency, reduce unburned fuel emissions, and further optimize the combustion process by fully utilizing unburned fuel, intake boosting, and increasing fuel temperature. Background Art

[0002] Rotary engines are widely used in aviation, automotive, and industrial equipment due to their compact structure, smooth operation, and high power-to-weight ratio. Their unique design makes the engine small and lightweight, capable of providing powerful power output in a limited space. However, despite the many advantages of rotary engines, their efficiency issues during the combustion process have become one of the key factors restricting their further development. Due to the geometric structure of the combustion chamber and the characteristics of the combustion process, rotary engines have low combustion efficiency, and the exhaust gas often contains a large amount of unburned fuel. The presence of this unburned fuel not only means a waste of fuel resources and reduces the overall fuel utilization of the engine, but also leads to an increase in the hydrocarbon (HC) content in the exhaust emissions, further exacerbating environmental pollution. Especially in the current context of increasingly stringent global environmental protection requirements, the environmental performance of rotary engines needs to be improved urgently.

[0003] In the existing technology, the methods for treating unburned fuel in the exhaust gas of rotary engines are relatively limited. Traditional exhaust gas treatment technologies, such as catalytic converters and particulate filters, mainly treat pollutants in the exhaust gas, but do not pay enough attention to the recovery and utilization of unburned fuel. Existing exhaust gas recycling systems usually lack full utilization of unburned fuel and fail to effectively reintroduce these unburned fuels into the intake system to participate in the next round of combustion process. At the same time, many systems fail to combine intake boosting technology to increase the intake pressure, thereby optimizing combustion conditions and improving combustion efficiency. More importantly, the impact of fuel temperature on combustion efficiency has not been fully considered in existing systems. Fuel combustion at lower temperatures is often incomplete, and appropriately increasing the fuel temperature can improve the atomization effect of the fuel, promote more complete combustion, improve combustion efficiency and reduce the emission of unburned fuel.

[0004] Furthermore, the high-speed operation of rotary engines results in incomplete mixing of fuel and air, further leading to incomplete combustion. The existing technology lacks a system that comprehensively considers unburned fuel recovery, intake pressure boosting, and fuel temperature increase to comprehensively improve the combustion efficiency and environmental performance of rotary engines.

[0005] Therefore, there is an urgent need for a comprehensive system that can fully recover unburned fuel from exhaust, effectively boost intake pressure, and optimize the combustion process by increasing fuel temperature. Such a system would not only improve rotary engine combustion efficiency, reducing fuel waste and environmental pollution, but also enhance engine power output and overall performance, providing a more reliable and environmentally friendly solution for rotary engine applications in aviation, automotive, and industrial equipment. Summary of the Invention

[0006] The present invention provides an exhaust gas utilization system and method for improving the combustion efficiency of a rotary engine. By filtering and diverting the exhaust gas from the rotary engine, unburned fuel and high-temperature gases are processed separately. The unburned fuel flows back to the intake system through a first pipeline, while the high-temperature gases enter a supercharging device through a second pipeline for pressure boosting before being delivered to the intake system. A third pipeline connects the high-temperature gases to the fuel supply system to increase the fuel temperature. These three pipelines work together to fully utilize the unburned fuel, achieve intake supercharging, and increase the fuel temperature, significantly improving the rotary engine's combustion efficiency and reducing fuel waste and pollutant emissions.

[0007] The technical solution of the present invention is: an engine exhaust utilization system, which includes:

[0008] An exhaust gas filtering and diverting device, which is connected to the exhaust gas outlet of the rotary engine and is used to separate the exhaust gas into unburned fuel and high-temperature gas;

[0009] The unburned fuel flows back to the engine intake system through the first pipeline;

[0010] The high-temperature gas is divided into two branches through the second pipeline. The first branch enters the supercharging device, and the second branch enters the fuel temperature raising device.

[0011] The supercharging device is used to pressurize the high-temperature gas, and the pressurized high-temperature gas enters the engine intake system;

[0012] The fuel temperature raising device uses high temperature gas to raise the fuel temperature, and injects the heated fuel into the rotary engine through the injector.

[0013] In one embodiment, it further includes: a control system electrically connected to the exhaust gas filtering and diverting device, the supercharging device, and the fuel temperature raising device;

[0014] The control system adjusts the exhaust gas diversion ratio of the air filter diversion device, adjusts the working parameters of the supercharging device and adjusts the heating state of the fuel temperature raising device in real time according to the operating status of the rotary engine.

[0015] In one embodiment, the exhaust gas filtering device includes a filter and a diverter valve. The filter is used to filter the exhaust gas. The diverter valve divides the filtered exhaust gas into an unburned fuel portion and a high-temperature gas portion, and sends the unburned fuel and the high-temperature gas into the first pipe and the second pipe respectively.

[0016] In one embodiment, the control system adjusts the exhaust gas diversion ratio of the air filter diversion device in real time according to the operating status of the rotary engine in a specific manner:

[0017] The control system sends instructions to the diverter valve, and the diverter valve adjusts the ratio of the exhaust gas to unburned fuel and high-temperature gas according to the instructions.

[0018] In one embodiment, the supercharging device includes a turbine, a compressor, and a cooling device;

[0019] The high-temperature gas enters the turbine-driven compressor through the first branch to increase the pressure of the high-temperature gas. The cooling device is used to reduce the temperature of the pressurized gas to a specified range, and the cooled gas is sent to the intake system.

[0020] In one embodiment, the fuel temperature raising device includes a heat exchanger and a control valve;

[0021] The high-temperature gas enters the heat exchanger through the second branch, where it exchanges heat with the fuel to increase the fuel temperature. The control valve adjusts the flow of the high-temperature gas according to the fuel temperature requirement, and the fuel with increased temperature is delivered to the injector.

[0022] The present invention also provides a method for utilizing engine exhaust gas, which comprises:

[0023] Connecting the exhaust gas filter and diversion device to the exhaust gas outlet of the rotary engine, and using the exhaust gas filter and diversion device to separate the exhaust gas into unburned fuel and high-temperature gas;

[0024] returning the unburned fuel to the engine intake system through the first pipeline;

[0025] The high-temperature gas is divided into two branches through the second pipeline, the first branch enters the supercharging device, and the second branch enters the fuel temperature raising device;

[0026] The high-temperature gas is pressurized by a supercharging device and the pressurized high-temperature gas is sent into the engine intake system;

[0027] The fuel temperature raising device is controlled to raise the fuel temperature by using high temperature gas, and the fuel with the raised temperature is sprayed into the rotary engine through the injector.

[0028] In one embodiment, it also includes: adjusting the exhaust gas diversion ratio of the air filter diversion device, adjusting the working parameters of the supercharging device and adjusting the heating state of the fuel temperature increasing device in real time according to the operating status of the rotary engine.

[0029] The present invention provides an exhaust gas utilization system and method for improving the combustion efficiency of a rotary engine. The system has the following beneficial effects:

[0030] (1) The present invention can fully recover unburned fuel. This process ensures that the unburned fuel can be fully utilized in the next round of combustion, significantly improving the overall utilization rate of fuel and reducing fuel costs.

[0031] (2) The present invention increases the pressure of high-temperature gas through a supercharging device and delivers the supercharged gas to the intake system. This process increases the density and pressure of the intake air, providing more oxygen for combustion, thereby enhancing combustion efficiency and engine power output, improving the overall performance of the engine, and meeting application scenarios with high power requirements;

[0032] (3) The present invention significantly increases the temperature of the fuel through heat exchange between high-temperature gas and fuel through the fuel temperature raising device. The temperature increase of the high-temperature fuel before entering the combustion chamber improves the atomization effect of the fuel, allowing the fuel to be more evenly distributed in the combustion chamber, making the mixing of fuel and air more sufficient, the combustion process more complete, and the overall combustion efficiency further improved, ensuring the efficient operation of the engine;

[0033] (4) The present invention significantly reduces the emission of hydrocarbons (HC) and other harmful gases in the tail gas by fully recovering unburned fuel and optimizing the combustion process, thereby reducing pollution to the atmospheric environment and complying with global environmental protection trends and regulatory requirements;

[0034] (5) The present invention significantly reduces fuel consumption and operating costs by improving combustion efficiency and fuel utilization, thereby improving the economy of the engine. Rotary engines with high combustion efficiency and low emissions are more attractive in the market, can meet high performance and environmental protection requirements, and enhance the market competitiveness and sales potential of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a schematic diagram of the overall structure of the exhaust gas utilization system for improving the combustion efficiency of the rotary engine according to the present invention.

[0036] Among them: 1-rotor engine; 2-intake system; 3-injector; 4-exhaust system; 5-filter device; 5a-filter; 5b-diverter valve; 6-unburned fuel return pipe; 7-high-temperature gas return pipe; 7a-boost gas pipe; 7b-fuel temperature raising gas pipe; 8-boosting device; 8a-turbine; 8b-compressor; 8c-cooling device; 9-fuel temperature raising device; 9a-control valve; 9b-heat exchanger; 10-oil pump. DETAILED DESCRIPTION

[0037] The present invention proposes an exhaust gas utilization system and method for improving the combustion efficiency of a rotary engine. The exhaust gas utilization system includes: a rotary engine, an exhaust gas filtering and diverting device, a supercharging device, a fuel temperature increasing device, a return pipe, a control system,

[0038] An exhaust gas filtering and diverting device is connected to the exhaust gas outlet of the rotary engine and is used to separate the exhaust gas into unburned fuel and high-temperature gas;

[0039] A booster device, connected to the high-temperature gas output end of the exhaust gas filtering and diverting device, for boosting the high-temperature gas;

[0040] A fuel temperature raising device connected to the high-temperature gas output end of the exhaust gas filtering and diverting device, used to raise the fuel temperature through the high-temperature gas;

[0041] The return pipe is respectively connected to the unburned fuel output end of the exhaust gas filtering and diverting device, the pressurized gas return end of the supercharging device, and the fuel return end of the fuel temperature raising device, and returns the unburned fuel to the intake system and fuel supply system of the rotary engine;

[0042] The control system is connected to the exhaust gas filter diversion device, the supercharging device and the fuel temperature raising device, and is used to control the exhaust gas diversion ratio, the working parameters of the supercharging device and the operating status of the fuel temperature raising device according to the operating status of the rotary engine.

[0043] The exhaust gas filtering and diverting device 5 is connected to the exhaust gas outlet of the rotary engine to separate the exhaust gas into unburned fuel and high-temperature gas; the unburned fuel flows back to the engine intake system 2 through the first pipeline 6; the high-temperature gas is divided into two branches through the second pipeline 7, the first branch enters the supercharging device 8, and the second branch enters the fuel temperature raising device 9; the supercharging device 8 is used to pressurize the high-temperature gas, and the pressurized high-temperature gas enters the engine intake system 2; the fuel temperature raising device 9 uses the high-temperature gas to increase the fuel temperature, and sprays the fuel with increased temperature into the rotary engine 1 through the injector 3.

[0044] Overall system structure

[0045] like Figure 1As shown, the exhaust gas utilization system for improving the combustion efficiency of a rotary engine of the present invention includes a rotary engine 1, an intake system 2, an injector 3, an exhaust gas exhaust system 4, a return pipe (6, 7, 7a, 7b), a filtering device 5, a supercharging device 8, a fuel temperature raising device 9, a control system and an oil pump 10. During operation, the rotary engine 1 generates exhaust gas, which is discharged from the exhaust system 4 to the filter device 5. After treatment by the filter device 5, the filtered exhaust gas is divided into an unburned fuel portion and a high-temperature gas portion. The unburned fuel flows back to the intake system 2 through pipeline 6, while the high-temperature gas portion is further divided into two paths through pipeline 7. One path enters the supercharger 8 through pipeline 7a, where it is supercharged and then connected to the intake system 2. The other path enters the fuel temperature raising device 9 through pipeline 7b. Fuel is pumped by the oil pump 10 through the oil line and also enters the fuel temperature raising device 9. The high-temperature gas is used to increase the fuel temperature. After the fuel temperature is increased, it is connected to the injector 3 and injected into the rotary engine 1, where it enters the next combustion cycle together with the supercharged gas and unburned fuel. The pipeline is made of high-temperature resistant material to ensure the safe transmission of the high-temperature gas and the efficient heating of the fuel. The control system adjusts the exhaust gas diversion ratio, the operating parameters of the supercharger, and the operating status of the fuel temperature raising device in real time according to the operating status of the rotary engine. By recycling the exhaust gas, fully recovering the unburned fuel, achieving intake pressure boost, and increasing the fuel temperature, the combustion efficiency of the rotary engine is significantly improved, the emission of unburned fuel is reduced, and environmental pollution is reduced.

[0046] Exhaust gas filtration device 5

[0047] The exhaust gas filtration device includes a filter 5a, a diverter valve 5b, and a diverter pipe. Filter 5a filters solid particles and impurities from the exhaust gas, ensuring the normal operation of subsequent equipment. Diverter valve 5b, based on the control system's instructions, separates the filtered exhaust gas into an unburned fuel fraction and a high-temperature gas fraction. The unburned fuel flows back to the intake system 2 via pipe 6, while the high-temperature gas fraction is further divided into two paths via pipe 7: one path enters the supercharging device through pipe 7a, and the other path enters the fuel temperature raising device through pipe 7b.

[0048] Booster 8

[0049] Supercharging device 8 employs a turbocharger structure, comprising a turbine 8a, a compressor 8b, and a cooling device 8c. High-temperature gas passes through turbine 8a, driving compressor 8b. This pressure is then increased and delivered to intake system 2 via pipe 7a. Supercharging device 8 is also equipped with a cooling device 8c, which cools the supercharged gas to ensure a suitable temperature before entering the intake system.

[0050] Fuel temperature raising device 9

[0051] Fuel temperature raising device 9 includes a heat exchanger 9b and a control valve 9a. High-temperature gas enters heat exchanger 9b through pipe 7b, where it exchanges heat with the fuel, raising the fuel temperature. Control valve 9a adjusts the flow of high-temperature gas based on the required fuel temperature to ensure the fuel temperature remains optimal. The elevated fuel is then delivered to injector 3 through pipe 7b.

[0052] The above specific description provides a detailed description of the purpose, technical devices and beneficial effects of the invention. It should be understood that the above is only a specific embodiment of the present invention, which is used to explain the present invention and is not used to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0053] In the present invention, the tail gas filtering and diversion device:

[0054] The combustion exhaust gas of the rotary engine is initially filtered to separate unburned fuel and high-temperature gas.

[0055] The unburned fuel flows back to the intake system through the first pipe to participate in the next round of combustion.

[0056] The high-temperature gas is pressurized by the supercharging device and then flows back to the intake system, increasing the intake pressure and enhancing combustion efficiency.

[0057] Booster device:

[0058] High-efficiency compressors or turbochargers are used to boost the high-temperature gas.

[0059] The pressurized gas is connected to the intake system through a dedicated pipe to ensure uniform mixing with fresh air and improve combustion efficiency.

[0060] Fuel temperature raising device:

[0061] Design a third pipeline to directly connect the high-temperature gas that has passed through the filtering and diversion device to the oil supply system.

[0062] The high-temperature gas is used to increase the temperature of the fuel so that the fuel reaches the optimal temperature state before entering the combustion chamber, thereby optimizing the combustion process.

[0063] Control system:

[0064] Equipped with an intelligent control module, it adjusts the exhaust gas diversion ratio, the working parameters of the supercharging device and the operating status of the fuel temperature raising device in real time according to the operating status of the rotary engine.

[0065] The exhaust gas temperature, pressure, unburned fuel content and fuel temperature are monitored by sensors to achieve automatic control and optimization of the system.

[0066] The present invention also provides a method for utilizing engine exhaust gas, which comprises:

[0067] Connecting the exhaust gas filter and diversion device to the exhaust gas outlet of the rotary engine, and using the exhaust gas filter and diversion device to separate the exhaust gas into unburned fuel and high-temperature gas;

[0068] returning the unburned fuel to the engine intake system through the first pipeline;

[0069] The high-temperature gas is divided into two branches through the second pipeline, the first branch enters the supercharging device, and the second branch enters the fuel temperature raising device;

[0070] The high-temperature gas is pressurized by a supercharging device and the pressurized high-temperature gas is sent into the engine intake system;

[0071] The fuel temperature raising device is controlled to raise the fuel temperature by using high temperature gas, and the fuel with the raised temperature is sprayed into the rotary engine through the injector.

[0072] The method further includes: adjusting the tail gas diversion ratio of the air filter diversion device, adjusting the working parameters of the supercharging device, and adjusting the heating state of the fuel temperature increasing device in real time according to the operating state of the rotary engine.

[0073] This invention provides an advanced exhaust gas utilization system and method for improving rotary engine combustion efficiency. This system aims to significantly enhance engine performance, reduce emissions, and achieve higher fuel economy through multiple optimization measures. Specifically, the system meticulously filters and diverts exhaust gas from the rotary engine, returning unburned fuel and high-temperature exhaust gas to the intake system, thereby maximizing energy utilization and optimizing the combustion process.

[0074] The system is equipped with a highly efficient exhaust filtration device that effectively separates unburned fuel and hot gases from the exhaust. Unburned fuel is returned to the intake system through a dedicated pipeline, where it participates in the next round of combustion, ensuring full fuel utilization and minimizing fuel waste. Furthermore, the hot gases are pressurized by a booster device, allowing some to flow back into the intake system, increasing intake pressure, improving combustion conditions, and enhancing combustion efficiency. To further optimize fuel combustion characteristics, the system incorporates a dedicated fuel temperature increase device. This device uses the returning hot gases to heat the fuel, raising its temperature to the optimal combustion range before entering the combustion chamber. This not only promotes more complete fuel combustion but also reduces fuel consumption during engine startup, improving overall engine thermal efficiency. Furthermore, both the fuel temperature increase device and the hot gas booster device in the system utilize intelligent control modules for precise regulation, dynamically adjusting parameters based on engine operating conditions and load requirements to ensure optimal combustion and emissions control under all operating conditions. This intelligent management enables the system to optimize the combustion process in real time, further improving combustion efficiency, reducing unburned fuel emissions, and significantly reducing environmental pollution.

[0075] The exhaust gas utilization system of the present invention effectively improves the combustion efficiency of the rotary engine, optimizes the fuel combustion process, and reduces the emission of unburned fuel and harmful gases through multiple innovative designs and intelligent control means. It has significant economic and environmental benefits and is suitable for various application scenarios that require high-efficiency, low-emission power systems. It has broad market prospects and application value.

Claims

1. An engine exhaust gas utilization system, characterized in that: It includes: An exhaust gas filtering and diverting device (5) is connected to the exhaust gas outlet of the rotary engine and is used to separate the exhaust gas into unburned fuel and high-temperature gas; The unburned fuel flows back to the engine intake system (2) through the first pipeline (6); The high-temperature gas is divided into two branches through the second pipeline (7), enters the supercharging device (8) through the first branch, and enters the fuel temperature raising device (9) through the second branch; The supercharging device (8) is used to supercharge the high-temperature gas, and the supercharged high-temperature gas enters the engine intake system (2); The fuel temperature raising device (9) uses high-temperature gas to raise the fuel temperature, and injects the fuel with the raised temperature into the rotary engine (1) through the injector (3).

2. The engine exhaust gas utilization system according to claim 1, characterized in that: It also includes: a control system, which is electrically connected to the exhaust gas filtering and diverting device (5), the supercharging device (8) and the fuel temperature raising device (9); The control system adjusts the tail gas diversion ratio of the air filter diversion device (5), adjusts the working parameters of the supercharging device (8), and adjusts the heating state of the fuel temperature raising device (9) in real time according to the operating state of the rotary engine.

3. The engine exhaust gas utilization system according to claim 2, characterized in that: The tail gas filtering device (5) comprises a filter (5a) and a diverter valve (5b). The filter (5a) is used to filter the tail gas. The diverter valve (5b) divides the filtered tail gas into an unburned fuel portion and a high-temperature gas portion, and respectively sends the unburned fuel and the high-temperature gas into a first pipe (6) and a second pipe (7).

4. The engine exhaust gas utilization system according to claim 3, characterized in that: The specific method of the control system adjusting the tail gas diversion ratio of the gas filter diversion device (5) in real time according to the operating state of the rotary engine is as follows: The control system sends an instruction to the diverter valve (5b), and the diverter valve (5b) adjusts the ratio of the tail gas to the unburned fuel and the high-temperature gas according to the instruction.

5. The engine exhaust gas utilization system according to claim 4, characterized in that: The supercharging device (8) includes a turbine (8a), a compressor (8b) and a cooling device (8c); The high-temperature gas enters the turbine (8a) through the first branch (7a) to drive the compressor (8b) to increase the pressure of the high-temperature gas. The cooling device (8c) is used to reduce the temperature of the pressurized gas to a specified range. The cooled gas is then sent to the intake system (2).

6. The engine exhaust gas utilization system according to claim 5, characterized in that: The fuel temperature raising device (9) comprises a heat exchanger (9b) and a control valve (9a); The high-temperature gas enters the heat exchanger (9b) through the second branch (7b), and the high-temperature gas and the fuel undergo heat exchange in the heat exchanger (9b), thereby increasing the temperature of the fuel. The control valve (9a) adjusts the flow of the high-temperature gas, and the fuel with increased temperature is delivered to the injector (3).

7. A method for utilizing engine exhaust, characterized in that: It includes: Connecting the exhaust gas filtering and diverting device (5) to the exhaust gas outlet of the rotary engine, and using the exhaust gas filtering and diverting device (5) to separate the exhaust gas into unburned fuel and high-temperature gas; Returning the unburned fuel to the engine intake system (2) through the first pipeline (6); The high-temperature gas is divided into two branches through the second pipeline (7), the first branch enters the supercharging device (8), and the second branch enters the fuel temperature raising device (9); Using a supercharging device (8) to supercharge the high-temperature gas, and sending the supercharged high-temperature gas into the engine intake system (2); The fuel temperature raising device (9) is controlled to raise the fuel temperature by using high-temperature gas, and the fuel with the raised temperature is sprayed into the rotary engine (1) through the injector (3).

8. The engine exhaust gas utilization method according to claim 7, characterized in that: It also includes: adjusting the tail gas diversion ratio of the air filter diversion device (5) in real time according to the operating state of the rotary engine, adjusting the working parameters of the supercharging device, and adjusting the heating state of the fuel temperature raising device.

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