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CN-122014399-A - Combined type intercooling system based on fuel precooling, micro vortex tube and waste gas recycling

CN122014399ACN 122014399 ACN122014399 ACN 122014399ACN-122014399-A

Abstract

The invention discloses a combined type intercooling system based on fuel precooling and a micro-vortex tube and waste gas recycling, which comprises a primary cooling unit, a secondary cooling unit and a tertiary cooling unit which are sequentially connected along the air flowing direction entering an engine, wherein the primary cooling unit is used for utilizing fuel as a primary cold source to respectively perform primary cooling on charge air and waste gas of the engine and simultaneously preheat the fuel, the secondary cooling unit is used for introducing high-pressure driving air flow to generate low-temperature air flow and performing deep cooling on the primarily cooled charge air and waste gas, and the tertiary cooling unit is used for mixing the deeply cooled charge air and the waste gas to control the air inlet temperature finally entering the engine.

Inventors

  • WANG YANHU
  • DU JIAN
  • CHEN XIZHANG
  • WANG ZHIRUI
  • HU FENG

Assignees

  • 温州大学

Dates

Publication Date
20260512
Application Date
20260306

Claims (8)

  1. 1. The combined type intercooling system based on the fuel precooling, the micro vortex tube and the waste gas recycling is characterized by comprising a primary cooling unit, a secondary cooling unit and a tertiary cooling unit which are sequentially connected along the air flow direction entering an engine (7); the primary cooling unit is used for utilizing fuel oil as a primary cold source, respectively carrying out primary cooling on the charge air and the waste gas of the engine (7), and simultaneously preheating the fuel oil; the secondary cooling unit is used for introducing high-pressure driving airflow to generate low-temperature airflow and deeply cooling the primarily cooled charge air and the exhaust gas discharged by the engine (7); The three-stage cooling unit is used for mixing the deeply cooled charge air with the exhaust gas to control the temperature of the intake air finally entering the engine (7).
  2. 2. The combined type intercooling system based on the fuel precooling and the micro-vortex tube and the waste gas recycling according to claim 1 is characterized in that the primary cooling unit is a fuel oil cooler (3), and the fuel oil cooler (3) is arranged on a fuel oil supply pipeline of an engine (7); the first air inlet of the fuel cooler (3) is connected with the outlet of the turbocharger (1) and is used for primarily cooling the charge air; the second air inlet of the fuel cooler (3) is connected with an exhaust gas discharge port of the engine (7) and is used for primarily cooling the exhaust gas of the engine (7) and preheating fuel.
  3. 3. The combined type intercooling system based on fuel precooling and micro-vortex tube and waste gas recycling as claimed in claim 2, wherein the fuel cooler (3) adopts a plate-fin heat exchanger; A proportional control valve (2) is arranged between the air inlet of the plate-fin heat exchanger and the turbocharger (1); An air inlet of the proportional control valve (2) is connected with an outlet of the turbocharger (1); the first air outlet of the proportional control valve (2) is connected with the first air inlet of the plate-fin heat exchanger; and a driving gas circuit is led out of the second outlet of the proportional control valve (2) and is connected with the third gas inlet of the secondary cooling unit so as to drive the secondary cooling unit to operate.
  4. 4. -A combined charge air system based on fuel pre-cooling and micro-vortex tube and exhaust gas recycling according to claim 3, characterized in that the exhaust gas discharge port of the engine (7) is further provided with a digitally controlled engine exhaust gas recirculation valve (6) for controlling the amount of exhaust gas entering the plate-fin heat exchanger from the exhaust gas discharge port of the engine (7) to reduce the combustion temperature of the engine (7) and to suppress nitrogen oxide emissions.
  5. 5. A combined cold system based on fuel pre-cooling and micro-vortex tube and exhaust gas recycling according to claim 3, characterized in that the secondary cooling unit is a micro-vortex tube cooler (4); The first air inlet of the micro vortex tube cooler (4) is connected with the first air outlet of the plate-fin heat exchanger, and the second air inlet of the micro vortex tube cooler (4) is connected with the second air outlet of the plate-fin heat exchanger; and a third air inlet of the micro vortex tube cooler (4) is connected with a second outlet of the proportional control valve (2) and is used for introducing high-pressure driving air flow, generating low-temperature air flow by utilizing the vortex tube effect and deeply cooling the primarily cooled charge air and the primarily cooled exhaust gas.
  6. 6. The combined fuel precooling and micro-vortex tube and exhaust gas recycling intercooler system according to claim 4, characterized in that the three-stage cooling unit is a compact air-air cooler (5); The first air inlet of the compact air-air cooler (5) is connected with the first air outlet of the micro vortex tube cooler (4), and the second air inlet of the compact air-air cooler (5) is connected with the second air outlet of the micro vortex tube cooler (4) and is used for mixing the deeply cooled pressurized air with the waste gas to obtain mixed gas; The mixed gas enters a combustion chamber of the engine through an air outlet of the compact air-air cooler (5).
  7. 7. The combined type intercooling system based on fuel precooling and micro-vortex tube and waste gas recycling as set forth in claim 1, further comprising an intelligent control system (8); The intelligent control system (8) comprises an engine load sensor (81), a control unit (82) and an air inlet temperature sensor (83); The air inlet temperature sensor (83) is used for collecting the final air inlet temperature before entering the engine (7) in real time and feeding back the final air inlet temperature to the control unit (82); The engine load sensor (81) is used for acquiring the load state of the engine (7) in real time so as to judge the demand level of the engine (7) on the intake air cooling quantity; the control unit (82) is used for intelligently adjusting the opening of the proportional control valve (2) according to the real-time load state of the engine (7), the preset target air inlet temperature and the real-time temperature fed back by the air inlet temperature sensor (83).
  8. 8. The combined fuel pre-cooling and micro-vortex tube and exhaust gas recycling intercooler system of claim 7, wherein the control logic of the control unit (82) is: When the temperature required by the engine (7) is relatively high, the control unit (82) reduces or closes the opening degree of the proportional control valve (2), the charge air and the exhaust gas are primarily cooled by the fuel oil cooler (3), and the micro vortex tube cooler (4) is in a non-working or low-power consumption state; When the temperature required by the engine (7) is relatively low, the control unit (82) increases the opening of the proportional control valve (2) and increases the air flow driving the micro vortex tube cooler (4) to generate low-temperature air flow for deep cooling of the initially cooled charge air and exhaust gas.

Description

Combined type intercooling system based on fuel precooling, micro vortex tube and waste gas recycling Technical Field The invention relates to the technical field of piston aeroengines, in particular to a composite type intercooling system based on fuel precooling, a micro vortex tube and waste gas recycling. Background The turbo-charging technology can significantly improve the power density of the engine, but the high-temperature air intake after supercharging can cause the engine knocking tendency to increase and the thermal efficiency to decrease. For this purpose, an intercooler is required for cooling the charge air. The traditional air-air cooler is limited by the ambient temperature, the cooling efficiency is limited, and the water-air cooler system is complex and has the difficult problem of heat management. In the prior art, the concept of using fuel oil as a cold source exists, but when the engine is under a large load and has high supercharging, the cooling capacity of the fuel oil cooler is possibly insufficient due to the relatively limited fuel oil flow, so that the cooling of the intake air is insufficient. While the vortex tube can generate low-temperature airflow, the total refrigeration efficiency is low, and if the vortex tube is independently used for cooling all intake air, the energy consumption is excessive, so that the vortex tube has no economical efficiency. Therefore, how to overcome the limitation of the prior art, designing an intercooler system capable of realizing efficient and stable cooling under any working condition is a problem to be solved in the art. Disclosure of Invention The invention aims to provide a compound intercooling system based on fuel precooling, a micro-vortex tube and waste gas recycling, which sequentially carries out three-stage compound cooling on pressurized air through fuel precooling, micro-vortex tube refrigeration and waste gas mixing, thereby realizing accurate control on the inlet air temperature of an engine. In order to achieve the above purpose, the present invention provides the following technical solutions: A composite intercooling system based on fuel precooling, a micro vortex tube and waste gas recycling comprises a primary cooling unit, a secondary cooling unit and a tertiary cooling unit which are sequentially connected along the air flow direction entering an engine; The primary cooling unit is used for primarily cooling the charge air and the exhaust gas of the engine respectively by taking the fuel oil as a primary cold source, and simultaneously preheating the fuel oil; the secondary cooling unit is used for introducing high-pressure driving airflow to generate low-temperature airflow and deeply cooling the primarily cooled charge air and the exhaust gas discharged by the engine; the three-stage cooling unit is used for mixing the deeply cooled charge air with the exhaust gas to control the temperature of the intake air finally entering the engine. The primary cooling unit is a fuel oil cooler which is arranged on a fuel oil supply pipeline of the engine; the first air inlet of the fuel cooler is connected with the outlet of the turbocharger and is used for primarily cooling the charge air; And the second air inlet of the fuel cooler is connected with an exhaust gas discharge port of the engine and is used for primarily cooling the exhaust gas of the engine and preheating fuel. Further, the fuel oil cooler adopts a plate-fin heat exchanger; A proportional control valve is arranged between the air inlet of the plate-fin heat exchanger and the turbocharger; An air inlet of the proportional control valve is connected with an outlet of the turbocharger; The first air outlet of the proportional control valve is connected with the first air inlet of the plate-fin heat exchanger; and a driving gas circuit is led out of the second outlet of the proportional control valve and is connected with a third gas inlet of the secondary cooling unit so as to drive the secondary cooling unit to operate. Further, the exhaust gas outlet of the engine is also provided with a numerically controlled engine exhaust gas recirculation valve for controlling the amount of exhaust gas entering the plate-fin heat exchanger from the exhaust gas outlet of the engine so as to reduce the combustion temperature of the engine and inhibit the emission of nitrogen oxides. Further, the secondary cooling unit is a micro vortex tube cooler; The first air inlet of the micro vortex tube cooler is connected with the first air outlet of the plate-fin heat exchanger, and the second air inlet of the micro vortex tube cooler is connected with the second air outlet of the plate-fin heat exchanger; And a third air inlet of the micro vortex tube cooler is connected with a second outlet of the proportional control valve and is used for introducing high-pressure driving air flow, generating low-temperature air flow by utilizing the vortex tube effect and deeply cooling the primarily