CN108167053A - A kind of internal-combustion engine system - Google Patents

Abstract

The invention discloses an internal combustion engine system, which belongs to the technical field of internal combustion engines, comprising: an internal combustion engine (1), on which an air inlet and an exhaust port are arranged; a first turbine (2), whose inlet is connected to the exhaust gas of the internal combustion engine (1) mouth; the first compressor (3), its inlet communicates with the atmosphere, and its outlet communicates with the air intake of the internal combustion engine (1); the second turbine (4), its inlet communicates with the outlet of the first turbine (2); the second compressor machine (5), its inlet is connected to the outlet of the second turbine (4), and the outlet is connected to the atmosphere; the first turbine (2) is connected with the first compressor (3) and the second compressor through the first shafting (6) (5) Coaxial connection, used to drive the first compressor (3) and the second compressor (5) to rotate to perform compression work; the second turbine (4) outputs power through the second shafting (7). In the present invention, one turbine is used to drive two compressors to rotate, the other turbine is used for power output, and the reverse Brayden cycle is used to comprehensively recover and utilize the energy of exhaust gas. At the same time, it takes into account the intake boost of the internal combustion engine, so that the energy utilization rate of the entire system structure is higher. .

Description

an internal combustion engine system

technical field

The invention relates to the technical field of internal combustion engines, in particular to an internal combustion engine system.

Background technique

Internal combustion engines play a very important role in national production and life. At present, the vast majority of vehicles and ships are powered by internal combustion engines. The internal combustion engine consumes a large amount of fossil fuels, but on average only 30%-40% of the energy is converted into mechanical energy, and nearly 60%-70% of the energy is dissipated into the atmosphere in the form of heat transfer during the working process of the internal combustion engine. Among them, the exhaust gas energy emitted by the internal combustion engine accounts for about 30% of the total energy. That is to say, the energy actually utilized by the internal combustion engine is in the same proportion as the exhaust gas energy emitted, which causes a great waste of energy. Recycling the exhaust energy of internal combustion engines and continuously improving energy utilization efficiency are important means to achieve energy conservation and emission reduction, and are of great significance to the sustainable development of the global economy.

In order to solve the above problems, it is a very effective technical means to recover and utilize the exhaust gas energy of internal combustion engines by using turbocharging in the prior art, and it is widely used at present. Most of the existing diesel engines and about 40% of gasoline engines have adopted turbocharging technology. The technical scheme of prior art mainly contains following several kinds:

1. Solution 1: As shown in Figure 1, it is a schematic structural diagram of a turbocharged internal combustion engine system widely used in the prior art. Its working principle is: the exhaust gas discharged from the internal combustion engine 1 enters the turbine 2 to expand and do work, the turbine 2 outputs work to the compressor 3 through the shafting 6, the compressor 3 compresses the air, increases the intake pressure and density, and the compressed gas enters the heat exchanger 8 cooling, lowering the intake air temperature, further increasing the intake air density, and improving the dynamic performance of the internal combustion engine 1. The exhaust gas passing through the turbine 2 is discharged into the atmosphere after after-treatment. However, in this solution, the exhaust gas discharged after passing through the turbine 2 still has a relatively high temperature, and a part of the energy cannot be recovered, and the exhaust energy of the internal combustion engine is insufficiently utilized.

2. Scheme two: In order to further utilize the exhaust gas energy discharged by the turbine 2 in the scheme one, the technical scheme of the prior art is to add a turbocharging system behind the turbocharger 2 on the basis of the scheme one, and adopt two-stage turbocharging technology, Both the two-stage turbos are used for air intake boosting, but this solution is not suitable for situations where the power demand of the internal combustion engine is not large, and the matching of the two-stage supercharging system with the internal combustion engine is more complicated. At the same time, the exhaust gas expanded by the two-stage turbine still has a certain amount of recyclable energy, and this part of energy has not been recycled.

3. Scheme 3: When a single-stage turbocharger can meet the power requirements of the internal combustion engine, in order to avoid complicated system matching, two-stage turbocharger technology is generally not used. Instead, on the basis of Scheme 1, the technology of adding a power turbine behind the turbine 2 is used to further recover the exhaust gas energy of the internal combustion engine, but this scheme requires that the gas pressure entering the power turbine is higher than atmospheric pressure, so when the exhaust gas entering the power turbine When the pressure is close to atmospheric pressure, the working ability of the power turbine is limited, and the exhaust energy of the internal combustion engine cannot be further recovered.

Contents of the invention

(1) Purpose of the invention

The object of the present invention is to provide an internal combustion engine system. One turbine is used to drive two compressors to rotate, and the other turbine is used for power output. While taking into account the intake boost of the internal combustion engine, the reverse Brayden cycle is used for comprehensive recovery and utilization of exhaust gas energy, which makes the energy utilization rate of the entire system structure higher. The reverse Brayden cycle system is to pass the exhaust gas into the turbine, and then connect a cooling device and a compressor after the turbine, and the outlet of the compressor is the atmosphere. After the exhaust gas is expanded by the turbine, it enters the cooling device for cooling, and then is compressed to atmospheric pressure by the compressor and discharged into the atmosphere. This process is called the reverse Brayden cycle. It solves the problem of insufficient utilization of the exhaust gas energy of the internal combustion engine in the prior art, and at the same time solves the problem that the exhaust energy of the internal combustion engine cannot be further recovered due to the limited working capacity of the power turbine in the prior art; further The recovery and utilization of exhaust gas energy solves the problem in the prior art that part of the exhaust gas energy cannot be recycled due to the use of two-stage turbocharging, and it is not suitable for the situation where the power demand of the internal combustion engine is not large.

(2) Technical solution

In order to solve the above problems, the present invention provides an internal combustion engine system, comprising: an internal combustion engine, on which an air inlet and an exhaust port are arranged; a first turbine, whose inlet is connected to the exhaust port of the internal combustion engine; a first compressor, Its inlet communicates with the atmosphere, and its outlet communicates with the intake port of the internal combustion engine; the second turbine, its inlet communicates with the outlet of the first turbine; the second compressor, its inlet communicates with the outlet of the second turbine, and its outlet It is connected to the atmosphere; the first turbine is coaxially connected with the first compressor and the second compressor through a first shaft system, and is used to drive the first compressor and the second compressor to rotate and perform compression work.

Further, the second turbine outputs power to the power device through the second shaft system.

Further, the power device is a generator or a crankshaft of the internal combustion engine.

Further, the internal combustion engine system further includes: an intercooler, the inlet of which is connected to the outlet of the first compressor, and the outlet is connected to the intake port of the internal combustion engine, for cooling the gas discharged by the first compressor, And increase the intake air density of the internal combustion engine.

Further, the intercooler is an air-cooled or water-cooled heat exchanger.

Further, the internal combustion engine system further includes: a cooling device, which is arranged between the second turbine and the second compressor, and is used for cooling the gas discharged by the turbine.

Further, the cooling device is at least one of a first heat exchange component, a thermoelectric conversion component, a Rankine cycle system and an organic Rankine cycle system.

Further, the inlet of the first heat exchange component is connected to the outlet of the second turbine, and the outlet is connected to the inlet of the second compressor for cooling the gas discharged by the turbine.

Further, the inlet of the thermoelectric conversion component is connected to the outlet of the second turbine, and the outlet is connected to the inlet of the second compressor for cooling the gas discharged by the turbine and converting the absorbed heat energy into electric energy for output .

Further, the Rankine cycle system or the organic Rankine cycle system includes: a second heat exchange component, the first inlet of which is connected to the outlet of the second turbine, and the first outlet is connected to the inlet of the second compressor; a steam turbine, whose inlet is connected to the second outlet of the second heat exchange component; a third heat exchange component, whose inlet is connected to the outlet of the steam turbine; a pump, whose inlet is connected to the outlet of the third heat exchange component, The outlet is connected to the second inlet of the second heat exchange component; the steam turbine outputs power through the third shaft system; the Rankine cycle system or organic Rankine cycle system is used to cool the gas discharged from the turbine, and simultaneously The absorbed heat is converted into power output.

(3) Beneficial effects

The technical solution of the present invention has the following beneficial technical effects:

An internal combustion engine system provided by the present invention uses one turbine to drive two compressors to rotate, and the other turbine for power output, while taking into account the intake boost of the internal combustion engine, and uses the reverse Brayden cycle to comprehensively recover and utilize the exhaust gas energy, so that The energy utilization rate of the entire system structure is higher, which solves the problem of insufficient utilization of the exhaust energy of the internal combustion engine in the prior art, and at the same time solves the problem in the prior art that the exhaust energy of the internal combustion engine cannot be further recovered due to the limited working capacity of the power turbine; through The reverse Brayden cycle system is used to further recover and utilize the exhaust gas energy, which solves the problem in the prior art that part of the exhaust gas energy cannot be recovered due to the use of two-stage turbocharging, and it is not suitable for situations where the power demand of the internal combustion engine is not large.

The internal combustion engine system of the present invention can also use the thermoelectric material to replace the heat exchanger in the reverse Brayden cycle system, absorb the heat energy of the waste gas through the thermoelectric material, reduce the temperature of the gas, and at the same time, the thermoelectric material can also convert the absorbed heat energy into electrical energy, The recycling rate of the exhaust gas energy of the internal combustion engine is further improved.

The internal combustion engine system of the present invention can also utilize the Rankine cycle system and the organic Rankine cycle system to recycle the heat absorbed by the heat exchanger in the reverse Brayden cycle system, further improving the recovery rate of exhaust gas energy of the internal combustion engine.

Description of drawings

Fig. 1 is a schematic structural view of a turbocharged internal combustion engine system in the prior art;

Fig. 2 is a schematic diagram of the composition of the internal combustion engine system provided by Embodiment 1 of the present invention;

Fig. 3 is a schematic structural diagram of an internal combustion engine system provided by Embodiment 1 of the present invention;

Fig. 4 is a schematic structural diagram of an internal combustion engine system provided by Embodiment 2 of the present invention;

Fig. 5 is a schematic structural diagram of an internal combustion engine system provided by Embodiment 3 of the present invention;

Fig. 6 is a schematic structural diagram of the internal combustion engine system provided by Embodiment 5 of the present invention;

Fig. 7 is a schematic structural diagram of an internal combustion engine system provided by Embodiment 6 of the present invention;

Fig. 8 is a schematic structural diagram of an internal combustion engine system provided by Embodiment 7 of the present invention;

Fig. 9 is a schematic structural diagram of the internal combustion engine system provided by the eighth embodiment of the present invention.

Reference signs:

1. Internal combustion engine, 2. First turbine, 3. First compressor, 4. Second turbine, 5. Second compressor, 6. First shafting, 7. Second shafting, 8. Intercooler, 9. Cooling device, 91. First heat exchange component, 92. Thermoelectric conversion component, 93. Second heat exchange component, 94. Steam turbine, 95. Third heat exchange component, 96. Pump, 97. Third shaft system.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

Embodiment one

Fig. 2 is a schematic diagram of the composition of the internal combustion engine system provided by Embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of the internal combustion engine system provided by Embodiment 1 of the present invention.

Please refer to Fig. 2 and Fig. 3, the present invention provides an internal combustion engine system, including: an internal combustion engine 1, a turbine 2, a first compressor 3, a second turbine 4, a second compressor 5, a first shaft system 6 and a first shaft Department 7.

An internal combustion engine 1 is provided with an intake port and an exhaust port. The internal combustion engine 1 is a kind of power machine, which burns fuel inside and directly converts the heat energy released by the fuel combustion into a heat engine for power.

The inlet of the first turbine 2 is connected to the exhaust port of the internal combustion engine 1 , and the outlet is connected to the second turbine 4 .

The first compressor 3 has an inlet connected to the atmosphere and an outlet connected to the intake port of the internal combustion engine 1, and is used to compress the atmosphere and send it into the internal combustion engine 1 to participate in combustion and work, thereby improving the power of the internal combustion engine 1.

The inlet of the second compressor 5 is connected to the outlet of the second turbine 4, and the outlet is connected to the atmosphere, for compressing the gas discharged from the second turbine 4 and discharging it into the atmosphere.

The first turbine 2 is coaxially connected with the first compressor 3 and the second compressor 5 through the first shaft system 6, and is used to drive the first compressor 3 and the second compressor 5 to rotate and perform compression work. The second turbine 4 outputs power to the power plant through the second shaft system 7 for external power output.

Optionally, the power device is a generator or the crankshaft of the internal combustion engine 1 , but the present invention is not limited thereto, and the power device can also be other devices.

Please refer to Fig. 2, in this embodiment, the internal combustion engine system also includes an intercooler 8, the inlet of which is connected to the outlet of the first compressor 3, and the outlet is connected to the air inlet of the internal combustion engine 1 for cooling the first compressor 3 Exhaust gas, and increase the intake air density of the internal combustion engine 1.

Please refer to FIG. 3 , optionally, the intercooler 8 is an air-cooled or water-cooled heat exchanger, but the present invention is not limited thereto.

Please refer to FIG. 2 , in this embodiment, the internal combustion engine system further includes a cooling device 9 disposed between the second turbine 4 and the second compressor 5 for cooling the gas discharged from the second turbine 4 .

Please refer to FIG. 3 , in this embodiment, the cooling device 9 is a first heat exchange component 91, the inlet of the first heat exchange component 91 is connected to the outlet of the second turbine 4, and the outlet is connected to the inlet of the second compressor 5, Used to cool the gas discharged from the second turbine 4 .

Optionally, the first heat exchange component 91 is an air-cooled or water-cooled heat exchanger, but the present invention is not limited thereto.

Preferably, the first heat exchange component 91 is a water-cooled heat exchanger, and the water-cooled heat exchanger has a better cooling effect, so that the second compressor 5 consumes less power and has a higher energy recovery rate.

Please refer to Fig. 3, specifically, the first turbine 2, the first compressor 3 and the second compressor 5 are coaxial, connected coaxially through the first shafting 6, and the first turbine 2 drives the first compressor 3 and the second Compressor 5 works. The second turbine 4 is connected to the power plant through the second shaft system 7 to output power outward. According to the direction of gas flow, the components are arranged in the order of the first compressor 3 , the intercooler 8 , the internal combustion engine 1 , the first turbine 2 , the second turbine 4 , the first heat exchange component 91 and the second compressor 5 . Among them, the first turbine 2, the first compressor 3, and the intercooler 8 form a turbocharging system; the second turbine 4, the second compressor 5, and the first heat exchange component 91 form a reverse Brayden cycle system. The process in which the gas expanded by the first turbine 2 is re-expanded by the second turbine 4 to perform work, then cooled by the first heat exchange component 91 and then entered into the second compressor 5 to be compressed to atmospheric pressure is called the reverse Brayden cycle. The internal combustion engine system of the present invention adopts a turbocharging system and a reverse Brayton cycle system, and takes into account the comprehensive recovery and utilization of intake air supercharging and exhaust gas energy, so that the utilization rate of the exhaust gas energy of the internal combustion engine is higher.

The working principle of internal combustion engine system of the present invention is introduced below:

Please refer to FIG. 2 , the exhaust gas produced by the internal combustion engine 1 enters the first turbine 2 to expand and perform work, and the first turbine 2 is connected to the first compressor 3 and the second compressor 5 through the first shafting 6 .

The first turbine 2 drives the first compressor 3 to rotate through the first shaft system 6, and compresses the air to increase the intake pressure and density of the internal combustion engine 1, and after being cooled by the intercooler 8, the intake air density of the internal combustion engine 1 is further increased. The increase is beneficial to improve the dynamic performance of the internal combustion engine 1 . The air after supercharging and cooling enters the internal combustion engine 1 to mix with fuel for combustion.

At the same time, the first turbine 2 also drives the second compressor 5 to rotate through the first shaft system 6 . The outlet of the second air compressor 5 is an atmospheric environment, and a vacuum environment can be formed at its inlet end by the rotation of the second air compressor 5 . The pressure of the outlet of the second turbine 4 and the inlet of the second compressor 5 is almost equal, and only the pressure loss generated by the pipeline and the first heat exchange component 91 is very small. Therefore, the pressure at the outlet end of the second turbine 4 below atmospheric pressure. The pressure of the exhaust gas produced by the internal combustion engine 1 is relatively high. When it enters the second turbine 4 and expands below the atmospheric pressure, the expansion is larger and the work done is more, that is, more energy of the exhaust gas is recycled. The exhaust gas passing through the second turbine 4 is cooled by the heat exchanger 91, and the temperature of the gas is lowered. The internal combustion engine exhaust gas of the same mass flow is expanded through the second turbine 4 and compressed by the second compressor 5. Since the temperature and pressure of the gas entering the second compressor 5 are much lower than the temperature and pressure of the gas entering the second turbine 4, the compressed gas Power consumption will be relatively small. Through the second shaft system 7, all the mechanical energy generated by the second turbine 4 is output. The second shaft system 7 can be connected to a generator and a battery to store this part of energy in the form of electric energy. The second shaft system 7 can also be connected to The crankshaft of the internal combustion engine 1 provides power for the internal combustion engine 1 .

Embodiment two

Referring to FIG. 4 , the difference between this embodiment and the first embodiment is that the cooling device 9 uses a thermoelectric conversion component 92 instead of the first heat exchange component 91 .

The inlet of the thermoelectric conversion component 92 is connected to the outlet of the second turbine 4 , and the outlet is connected to the inlet of the second compressor 5 for cooling the gas discharged from the second turbine 4 and converting the absorbed heat energy into electrical energy for output.

Optionally, the material of the thermoelectric conversion component 92 is a thermoelectric material, which is a material that can convert thermal energy into electrical energy.

Specifically, after the exhaust gas discharged from the internal combustion engine 1 is expanded to perform work by the second turbine 4, it still has a relatively high temperature, and there is room for waste heat recovery and utilization. The exhaust gas discharged from the second turbine 4 absorbs the heat energy of the exhaust gas through the thermoelectric conversion component 92, so that the thermoelectric conversion component 92 reduces the temperature of the gas on the one hand, achieving the purpose of cooling, and on the other hand converts the absorbed heat energy into electrical energy, further improving The rate of recovery of exhaust gas energy of the internal combustion engine 1 .

The structures and connections of other parts in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Embodiment Three

Because in the technical solution of Embodiment 1, the first heat exchange component 91 absorbs the heat of the exhaust gas, the purpose of reducing the temperature of the exhaust gas can be achieved, but no matter whether the first heat exchange component 91 adopts an air-cooled or water-cooled heat exchanger, This part of the heat is not recycled, but dissipated into the atmosphere. Therefore, in this embodiment, the Rankine cycle system is used to replace the first heat exchange component 91 , and the heat absorbed by the second heat exchange component 93 is further recycled to improve the utilization rate of energy.

Referring to FIG. 5 , in this embodiment, the Rankine cycle system includes a second heat exchange component 93 , a steam turbine 94 , a third heat exchange component 95 , a pump 96 and a third shaft system 97 .

The first inlet of the second heat exchange component 93 is connected to the outlet of the second turbine 4 , and the first outlet is connected to the inlet of the second compressor 5 .

The inlet of the steam turbine 94 communicates with the second outlet of the second heat exchange component 93 .

The inlet of the third heat exchange member 95 communicates with the outlet of the steam turbine 94 .

Optionally, the third heat exchange component 95 is an air-cooled or water-cooled heat exchanger, but the present invention is not limited thereto.

The inlet of the pump 96 is connected to the outlet of the third heat exchange component 95 , and the outlet is connected to the second inlet of the second heat exchange component 93 .

The steam turbine 94 outputs power through the third shaft system 97 . Specifically, one end of the third shafting 97 is connected to the steam turbine 94, and the other end outputs power to an external power device.

The Rankine cycle system is used to cool the gas discharged from the second turbine 4, and at the same time convert the absorbed heat into power output, further recycle the exhaust gas energy of the internal combustion engine 1, and improve the energy utilization rate.

Specifically, the pump 96 provides power for the flow of the working fluid in the Rankine cycle system, and the working fluid passes through the second heat exchange component 93 to exchange heat with the exhaust gas discharged from the second turbine 4 . The working fluid of the Rankine cycle system is heated and the exhaust gas is cooled. The heated working fluid enters the steam turbine 94 , expands in the steam turbine 94 to perform work, and the mechanical energy generated by the work is output through the third shaft system 97 . The expanded working fluid enters the third heat exchange component 95 to be cooled, and then enters the pump 96 for circulation. This method can further recycle the exhaust gas energy of the internal combustion engine 1, thereby improving the energy utilization rate.

The structures and connections of other parts in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Embodiment Four

The difference between this embodiment and the third embodiment is that an organic Rankine cycle system is used instead of the Rankine cycle system.

The structure, composition and working principle of the organic Rankine cycle system and the Rankine cycle system are the same, the only difference is that the circulating working medium in the Rankine cycle system is water, and the circulating working medium in the organic Rankine cycle system is organic matter.

The structures and connections of other parts in this embodiment are the same as those in Embodiment 3, and will not be repeated here.

Embodiment five

Please refer to Fig. 6, the difference between this embodiment and Embodiment 1 and Embodiment 2 is that the cooling device 9 in this embodiment is the first heat exchange component 91 in Embodiment 1 and the thermoelectric element in Embodiment 2 The conversion part 92 is combined, that is, the gas discharged from the second turbine 4 is cooled by using the first heat exchange part 91 and the thermoelectric conversion part 92 at the same time. While increasing the cooling effect, the heat energy absorbed by the thermoelectric conversion part 92 can also be converted into power output.

Please refer to FIG. 6, specifically, the gas discharged from the second turbine 4 first passes through the first heat exchange component 91, and then passes through the thermoelectric conversion component 92 to be connected to the inlet of the second compressor 5, that is, the inlet of the first heat exchange component 91. It is connected to the outlet of the second turbine 4 , the outlet is connected to the inlet of the thermoelectric conversion component 92 , and the outlet of the thermoelectric conversion component 92 is connected to the inlet of the second compressor 5 .

The present invention is not limited thereto. The gas discharged from the second turbine 4 may first pass through the thermoelectric conversion component 92, and then pass through the first heat exchange component 91 to be connected to the inlet of the second compressor 5, that is, the inlet of the thermoelectric conversion component 92. It is connected to the outlet of the second turbine 4 , the outlet is connected to the inlet of the first heat exchange component 91 , and the outlet of the first heat exchange component 91 is connected to the inlet of the second compressor 5 .

The structures and connections of other parts in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Embodiment six

Please refer to Fig. 7, the difference between this embodiment and Embodiment 1 and Embodiment 3 is that the cooling device 9 in this embodiment is the first heat exchange component 91 in Embodiment 1 and the Lang in Embodiment 3 Combined with the Rankine cycle system, that is, the first heat exchange component 91 and the Rankine cycle system are used to cool the gas discharged from the second turbine 4. While increasing the cooling effect, the heat absorbed by the second heat exchange component 93 is further reduced. Recycling to improve energy efficiency.

Please refer to FIG. 7. Specifically, the gas discharged from the second turbine 4 first passes through the second heat exchange component 93 in the Rankine cycle system, and then passes through the first heat exchange component 91 to the inlet of the second compressor 5, namely In the Rankine cycle system, the first inlet of the second heat exchange component 93 is connected to the outlet of the second turbine 4, the first outlet is connected to the inlet of the first heat exchange component 91, and the outlet of the first heat exchange component 91 is connected to the second turbine 4. Inlet of compressor 5.

The present invention is not limited thereto. The gas discharged from the second turbine 4 may first pass through the first heat exchange component 91, and then pass through the second heat exchange component 93 in the Rankine cycle system to be connected to the inlet of the second compressor 5. , that is, the inlet of the first heat exchange component 91 is connected to the outlet of the second turbine 4, the outlet is connected to the first inlet of the second heat exchange component 93 in the Rankine cycle system, and the first outlet of the second heat exchange component 93 is connected to The inlet of the second compressor 5.

The structures and connections of other parts in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Embodiment seven

Please refer to Fig. 8, the difference between the present embodiment and the second embodiment and the third embodiment is that the cooling device 9 in the present embodiment is a combination of the thermoelectric conversion component 92 in the second embodiment and the Rankine cycle in the third embodiment The system is combined, that is, the gas discharged from the second turbine 4 is cooled by using the thermoelectric conversion component 92 and the Rankine cycle system at the same time. While increasing the cooling effect, the heat energy absorbed by the thermoelectric conversion component 92 can also be converted into electrical energy output. The heat absorbed by the second heat exchange component 93 is further recycled to improve energy utilization.

Please refer to Fig. 8. Specifically, the gas discharged from the second turbine 4 first passes through the second heat exchange component 93 in the Rankine cycle system, and then passes through the thermoelectric conversion component 92 to the inlet of the second compressor 5, that is, the Rankine The first inlet of the second heat exchange component 93 in the circulation system is connected to the outlet of the second turbine 4 , the first outlet is connected to the inlet of the thermoelectric conversion component 92 , and the outlet of the thermoelectric conversion component 92 is connected to the inlet of the second compressor 5 .

The present invention is not limited thereto. The gas discharged from the second turbine 4 may first pass through the thermoelectric conversion component 92, and then pass through the second heat exchange component 93 in the Rankine cycle system to be connected to the inlet of the second compressor 5, namely The inlet of the thermoelectric conversion part 92 is connected to the outlet of the second turbine 4, the outlet is connected to the first inlet of the second heat exchange part 93 in the Rankine cycle system, and the first outlet of the second heat exchange part 93 is connected to the second compressed air Entrance to machine 5.

The structures and connections of other parts in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Embodiment eight

Please refer to Fig. 9. The difference between this embodiment and Embodiments 1 to 7 is that the cooling device 9 in this embodiment is the first heat exchange component 91 in Embodiment 1 and the thermoelectric conversion in Embodiment 2. The component 92 is combined with the Rankine cycle system in the third embodiment, that is, the first heat exchange component 91, the thermoelectric conversion component 92 and the Rankine cycle system are used to cool the gas discharged from the second turbine 4, while increasing the cooling effect , the heat energy absorbed by the thermoelectric conversion component 92 can also be converted into electric energy output, and the heat absorbed by the second heat exchange component 93 can be further recycled to improve energy utilization.

Please refer to FIG. 9. Specifically, the gas discharged from the second turbine 4 first passes through the second heat exchange component 93 in the Rankine cycle system, then passes through the first heat exchange component 91, and finally passes through the thermoelectric conversion component 92 to connect to the second The inlet of the compressor 5, that is, the first inlet of the second heat exchange component 93 in the Rankine cycle system is connected to the outlet of the second turbine 4, the first outlet is connected to the inlet of the first heat exchange component 91, and the thermoelectric conversion component 92 The inlet is connected to the outlet of the first heat exchange component 91 , and the outlet is connected to the inlet of the second compressor 5 .

The present invention is not limited thereto. The gas discharged from the second turbine 4 may first pass through the thermoelectric conversion component 92, then pass through the first heat exchange component 91, and finally pass through the second heat exchange component 93 in the Rankine cycle system to be connected to The inlet of the second compressor 5. Alternatively, the gas discharged from the second turbine 4 first passes through the first heat exchange component 91 , then passes through the second heat exchange component 93 in the Rankine cycle system, and finally passes through the thermoelectric conversion component 92 to be connected to the inlet of the second compressor 5 .

In this embodiment, the arrangement sequence of the first heat exchange component 91, the thermoelectric conversion component 92 and the Rankine cycle system includes but not limited to the above-mentioned several sequences, and the first heat exchange component 91, the thermoelectric conversion component 92 and the Rankine cycle system also Arrangements can be made in other orders, and the specific arrangement order can be appropriately adjusted according to actual needs.

The structures and connections of other parts in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Embodiment nine

The difference between this embodiment and Embodiment 1 to Embodiment 7 is that the cooling device 9 in this embodiment is the first heat exchange component 91 in Embodiment 1, the thermoelectric conversion component 92 in Embodiment 2, and the The Rankine cycle system in the third is combined with the organic Rankine cycle system in the fourth embodiment, that is, the first heat exchange component 91, the thermoelectric conversion component 92, the Rankine cycle system and the organic Rankine cycle system are used to control the second turbine. 4. The exhausted gas is cooled. While increasing the cooling effect, the heat energy absorbed by the thermoelectric conversion component 92 can also be converted into electrical energy output, and the heat absorbed by the second heat exchange component 93 can also be further recycled to improve energy efficiency. utilization rate.

Specifically, the gas discharged from the second turbine 4 first passes through the first heat exchange component 91, then through the thermoelectric conversion component 92, then through the Rankine cycle system, and finally through the organic Rankine cycle system to be connected to the inlet of the second compressor 5 .

The present invention is not limited thereto. The gas discharged from the second turbine 4 may first pass through the thermoelectric conversion component 92, then pass through the first heat exchange component 91, then pass through the Rankine cycle system, and finally pass through the organic Rankine cycle system to connect to The inlet of the second compressor 5.

In this embodiment, the arrangement sequence of the first heat exchange component 91, the thermoelectric conversion component 92, the Rankine cycle system and the organic Rankine cycle system includes but not limited to the above-mentioned several sequences, the first heat exchange component 91, the thermoelectric conversion The component 92, the Rankine cycle system and the organic Rankine cycle system can also be arranged in other orders, and the specific order of arrangement can be appropriately adjusted according to actual needs.

The structures and connections of other parts in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

In the above sixth, seventh and eighth embodiments, the Rankine cycle system in the cooling device 9 can also be replaced by an organic Rankine cycle system.

The present invention aims to protect an internal combustion engine system. One turbine is used to drive two compressors to rotate, and the other turbine is used for power output. While taking into account the intake boost of the internal combustion engine, the reverse Brayden cycle is used to comprehensively recover and utilize exhaust gas energy. It makes the energy utilization rate of the whole system structure higher, solves the problem of insufficient utilization of the exhaust energy of the internal combustion engine in the prior art, and at the same time solves the problem in the prior art that the exhaust energy of the internal combustion engine cannot be further recovered due to the limited working capacity of the power turbine; By using the reverse Brayden cycle system to further recover and utilize the energy of the exhaust gas, it solves the problem in the prior art that part of the energy of the exhaust gas cannot be recovered due to the use of two-stage turbocharging, and it is not suitable for the situation where the power demand of the internal combustion engine is not large. The internal combustion engine system of the present invention can also use the thermoelectric material to replace the heat exchanger, absorb the heat energy of the exhaust gas through the thermoelectric material, and reduce the temperature of the gas. recycling rate. The internal combustion engine system of the present invention can also use the Rankine cycle system to recycle the heat absorbed by the heat exchanger in the reverse Brayton cycle system, further improving the recovery rate of the exhaust gas energy of the internal combustion engine.

In the description of the present invention, it should be noted that the terms "first", "second", "third" and "fourth" are used for description purposes only, and should not be understood as indicating or implying relative importance.

It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principle of the present invention, and not to limit the present invention. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention shall fall within the protection scope of the present invention. Furthermore, it is intended that the appended claims of the present invention embrace all changes and modifications that come within the scope and metesques of the appended claims, or equivalents of such scope and metes and bounds.

Claims (10)

1. a kind of internal-combustion engine system, which is characterized in that including：

Internal combustion engine (1) sets air inlet and exhaust outlet thereon；

First turbine (2), entrance are communicated to the exhaust outlet of the internal combustion engine (1)；

First compressor (3), entrance connection air, outlet to the air inlet of the internal combustion engine (1)；

Second turbine (4), entrance are communicated to the outlet of first turbine (2)；

Second compressor (5), entrance are communicated to the outlet of second turbine (4), and the outlet of second compressor (5) connects Lead to air；

First turbine (2) by the first shafting (6) connection coaxial with first compressor (3) and the second compressor (5), For first compressor (3) and the second compressor (5) to be driven to rotate and carry out compressed action.

2. system according to claim 1, which is characterized in that

Second turbine (4) exports power to power plant by the second shafting (7).

3. system according to claim 2, which is characterized in that

The power plant is generator or the bent axle of the internal combustion engine (1).

4. system according to claim 1, which is characterized in that further include：

Charge air cooler (8), entrance are communicated to the outlet of first compressor (3), the outlet of the charge air cooler (8) to institute The air inlet of internal combustion engine (1) is stated, for cooling down the gas of the first compressor (3) discharge, and increases the internal combustion engine (1) Density of the induced air.

5. system according to claim 4, which is characterized in that

The charge air cooler (8) is air-cooled or water cooling heat exchanger.

6. system according to claim 1, which is characterized in that further include：

Cooling device (9) is arranged between second turbine (4) and the second compressor (5), for cooling down second whirlpool Take turns the gas of (4) discharge.

7. system according to claim 6, which is characterized in that

The cooling device (9) is the first heat exchanger components (91), thermoelectric conversion member (92), Rankine cycle system and organic Rankine At least one of circulatory system.

8. system according to claim 7, which is characterized in that

The entrance of first heat exchanger components (91) is communicated to the outlet of second turbine (4), first heat exchanger components (91) outlet to second compressor (5) entrance, for cooling down the gas of second turbine (4) discharge.

9. system according to claim 7, which is characterized in that

The entrance of the thermoelectric conversion member (92) is communicated to the outlet of second turbine (4), the thermoelectric conversion member (92) outlet to second compressor (5) entrance, for cooling down the gas of second turbine (4) discharge, and The thermal energy of absorption is converted into electric energy output.

10. system according to claim 7, which is characterized in that the Rankine cycle system or organic rankine cycle system Including：

Second heat exchanger components (93), first entrance are communicated to the outlet of second turbine (4), second heat exchanger components (93) first outlet is communicated to the entrance of second compressor (5)；

Steam turbine (94), entrance are communicated to the second outlet of second heat exchanger components (93)；

Third heat exchanger components (95), entrance are communicated to the outlet of the steam turbine (94)；

It pumps (96), entrance is communicated to the outlet of the third heat exchanger components (95), and the outlet of the pump (96) is described in The second entrance of second heat exchanger components (93)；

The steam turbine (94) exports power by third shafting (97)；

The Rankine cycle system or organic rankine cycle system are used to cool down the gas of the second turbine (4) discharge, simultaneously The heat of absorption is converted into power output.