JPH0586877A - Turbocharged engine - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] A part of the supply air obtained by taking a large heat drop recovered by the exhaust turbine is supplied to the outside, and at the same time as the air compressor of the supercharger. Provided is a turbocharged engine in which a supply air bypass passage branched from a communication supply passage is provided and the pressure energy held by the bypass supply air and the heat energy recovered by the bypass supply air are supplied to the exhaust turbine. [Structure] An air flow rate adjusting throttle device 20 provided in an air supply bypass passage 19 branched from an air supply passage 32 that communicates between an engine body 10 and an air compressor 16, and recovery of exhaust gas waste heat of an exhaust turbine 14. Heat exchanger 24 for heating the supply air from the supply air bypass passage 19 and an additional volume pipe 28 connected to the heat exchanger.
And the air supply bypass device 2 and another air flow control throttle device 35 in the air supply discharge passage 34 branched from the air supply passage 32.
And a separate heat exchanger 37 for heating the supply air flowing through the supply air discharge passage 34 by the waste heat of the exhaust gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine with an exhaust turbocharger equipped with a hot air supply device (hereinafter referred to as a turbocharged engine).

[0002]

2. Description of the Related Art Conventionally, by reducing the area of the exhaust turbine of a supercharger driven by the exhaust gas of a turbocharged engine and increasing the heat drop of the exhaust gas energy recovered by the exhaust turbine, By increasing the work of the air compressor and letting in the air by the air compressor of the supercharger,
A method is adopted in which a part of the charge air discharged from the air compressor is supplied to the outside of the turbocharged engine and the performance output of the engine body is satisfied by the remaining charge air. A part of the supply air supplied to the outside of the turbocharged engine recovers waste heat from the exhaust gas by a heat exchanger provided at the outlet of the supercharger and is sent to the ship's ship as heat energy to carry it. It is known that it can be used for humidity control and drying.

[0003]

However, a part of the charge air supplied from the turbocharged engine to the outside is a part of the pressure energy of the air obtained by recovering and converting the exhaust energy from the engine body by the supercharger. Since it is a part, its amount may change depending on the output of the turbocharged engine, so that it may not be able to meet the demand load. That is, when the exhaust gas energy is reduced due to a low load operation of the turbocharged engine such as a change in weather and sea conditions during the voyage of the ship, and further deceleration navigation for adjusting the arrival time, etc. Inconvenience is seen. Further, when a part of the supply air supplied from the turbocharged engine to the outside is increased, the remaining supply amount of the supply air to the engine body is relatively insufficient and the performance output of the engine body is reduced. It causes inconvenience that is not satisfied.

Therefore, the object of the present invention is to solve the above problems in the prior art by reducing the exhaust turbine area of the supercharger of the turbocharged engine to reduce the exhaust gas of the exhaust gas supplied from the engine body. By taking a large heat drop to be collected by the turbocharger, a part of the charge air obtained by increasing the compression work of the air compressor of the supercharger is supplied to the outside of the turbocharged engine and An air supply bypass passage having a smaller flow path resistance than the engine main body connected to the exhaust turbine of the supercharger by branching from the air supply passage communicating with the air compressor is provided. The increase in the amount of air supply discharged by the air compressor due to the decrease in the flow path resistance on the discharge side of the air compressor of the supercharger is the bypass air supply to the exhaust turbine of the supercharger, and the pressure energy possessed by the bypass air supply is Supplied Both are provided with an air flow rate adjusting throttle device and a heat exchanger for recovering waste heat from exhaust gas from the exhaust turbine of the supercharger in the supply air bypass passage so that the heat energy recovered by the bypass supply air is supercharged. To provide a turbocharged engine having a charge air bypass device, which is supplied to an exhaust turbine of a machine.

Therefore, in such an air supply bypass device for a turbocharged engine, heat is exchanged with the air flow control throttle device in the air supply bypass passage branched from the air supply passage communicating with the air compressor of the supercharger. And an additional volume pipe that is provided at the exhaust turbine inlet of the supercharger and that attenuates the pressure wave of the exhaust gas that is introduced from the engine body through the exhaust pipe. The exhaust turbine of the supercharger is communicated with the exhaust turbine via the exhaust pipe. The bypass charge introduced into the exhaust turbine of the supercharger has the effect of increasing the gas flow rate in the exhaust turbine of the supercharger with the increase of the pressure energy and the thermal energy. With the effect of reducing, the energy recovery work of the turbocharger exhaust turbine is increased.

Such increased recovery work of the exhaust turbine of the supercharger is supplied to the air compressor of the supercharger as rotational energy and is discharged by the increase of the work amount of the air compressor of the supercharger. As a result of increasing and balancing the supply air amount and the supply pressure, a part of the supply air taken out of the turbocharged engine is also increased and provided at the exhaust turbine outlet of the supercharger. The amount of exhaust gas waste heat recovered by the heat exchanger is also increased, and the hot air energy supplied from the turbocharged engine to the outside is also increased. In the air supply bypass passage,
Even if the heat exchanger for recovering the bypass air from the exhaust gas from the exhaust turbine of the supercharger is omitted due to cost or installation space, the pressure energy of the bypass air and the flow rate effect of the supercharger With increased exhaust turbine work,
The hot air energy supplied to the outside from the turbocharged engine can be increased.

[0007]

According to the present invention, in order to achieve the above-mentioned object, a turbocharged engine is a turbocharged engine in which a turbine area of an exhaust turbine of a supercharger is reduced. An air flow rate adjusting throttle device provided in an air supply bypass passage branched from an air supply passage that connects the engine body of the internal combustion engine and the air compressor of the supercharger, and a connecting pipe to the air flow rate adjusting throttle device. A heat exchanger connected through the heat exchanger to heat the exhaust gas waste heat from the exhaust turbine of the supercharger to heat the intake air from the intake air bypass passage; and an additional volume pipe connected to the heat exchanger. A supply air bypass device, a supply air discharge passage branched from a supply air passage communicating with an air compressor of the supercharger, and another air flow rate adjusting throttle device provided in the supply air discharge passage. And connected to the air flow control throttle device And a hot air supply device including another heat exchanger for heating the supply air flowing through the supply air discharge passage by recovering exhaust gas waste heat from the exhaust turbine of the supercharger. I am trying.

According to the above-mentioned means of the present invention,
During low-load operation and normal-load operation of a turbocharged engine, part of the air supply of the turbocharged engine is exhausted through a heat exchanger provided in the passage of the exhaust gas flowing out from the exhaust turbine of the turbocharger. As a method of increasing the hot air energy of the supply air heated by recovering the waste heat of the gas, the turbine area of the exhaust turbine of the turbocharger of the turbocharged engine is made small and the heat drop of the exhaust gas is made large. A method of increasing the heat recovery work of the exhaust turbine; a method of increasing the flow rate of the gas fluid introduced into the exhaust turbine to relatively reduce the turbine area and increasing the heat drop to increase the heat recovery work; There is a method of increasing the amount of heat of the gas fluid introduced into the turbine to increase the heat recovery work of the exhaust turbine, and the amount of increase in the heat energy recovered by the exhaust turbine is equivalent to the rotational energy. Becomes increased conservation, the drive shaft is transferred to the air compressor of the turbocharger, the air is converted into an increase in the pressure energy of the charge air is sucked compressed by the air compressor.

Therefore, an air supply bypass passage is provided in parallel with the engine body so as to branch from the air supply passage that connects the engine body and the air compressor of the supercharger, and the air supply discharge resistance of the air compressor of the supercharger is provided. Is reduced, the amount of intake air that is sucked and discharged from the air compressor of the supercharger is increased, and the amount of intake air that is increased by the decrease in the intake air discharge resistance flows through the intake air bypass passage to add additional volume. Is introduced into the exhaust pipe by the pipe, thereby mixing the exhaust gas from the engine body and increasing the flow rate of the gas fluid introduced into the exhaust turbine of the supercharger, and at the same time, The increase amount is adjusted by an air flow rate adjusting throttle device provided in the air supply bypass passage.

Next, an air supply bypass passage is provided which is branched from the air supply passage that connects the engine body and the air compressor of the supercharger and is provided in parallel with the engine body. An air supply bypass device comprising a flow control throttle device and a heat exchanger connected to the air flow control throttle device and provided in a passage for exhaust gas flowing out from the exhaust turbine of the supercharger, The supply air flowing through the supply air bypass passage of the supply air bypass device obtains heat energy by recovering the exhaust heat of the exhaust gas, and is introduced into the exhaust pipe from the additional volume pipe and mixed with the exhaust gas from the engine body to generate heat energy and gas. The increased flow rate of the mixed gas is supplied to the exhaust turbine of the supercharger, which increases the heat recovery work of the exhaust turbine.

In this way, the effect of the exhaust gas waste heat recovery of the charge air bypass passage and the charge air flowing through the charge air bypass passage is obtained by increasing the heat recovery work of the exhaust turbine of the supercharger by the air compression of the supercharger. This increases the work of the engine, which in turn increases the discharge charge and thus the part of the charge supplied to the outside by the turbocharged engine, and therefore the exhaust gas from the exhaust turbine of the turbocharger. The amount of waste heat recovered is increased and the supply of heat energy is increased. Other objects, features and advantages of the present invention will become apparent from the detailed description given below with reference to the accompanying drawings.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in the drawings, a turbocharged engine 1 according to the present invention includes exhaust pipes 11 and 12 of an engine body 10 of an internal combustion engine.
The intake air sucked by the air compressor 16 of the supercharger 13 having the exhaust turbine 14 into which exhaust gas from the exhaust gas is introduced from the exhaust turbine inlet and the air compressor 16 connected to the exhaust turbine 14 is supplied to the internal combustion engine body 10. It is mainly configured by a supply air bypass device 2 branched from a supply air passage 32 to be supplied, and a hot air supply device 3 further branched from the supply air bypass device 2. That is, the turbocharged engine 1 including the hot air supply device 3 of the present invention includes an engine body 10 of an internal combustion engine, first and second exhaust pipes 11 and 12 connected to the engine body 10, and an exhaust pipe 11. Exhaust turbine 1 in which exhaust gas from the turbines 12, 12 is introduced from the exhaust turbine inlet
4 and an air compressor 16 connected to the exhaust turbine 14
Is provided in the air supply bypass passage 19 of the branch pipe 18 branched from the air supply passage 32 through which the air intake sucked by the air compressor 16 of the supercharger 13 is supplied to the internal combustion engine body 10. The air flow adjusting throttle device 20 and the air supply from the air flow adjusting throttle device 20 introduced into the primary side from the connection pipe 39 connected to the exhaust outlet of the exhaust turbine 14 of the supercharger 13. The heat exchanger 24 heated by heat recovery, the additional volume pipe 28 connected to the secondary side of the heat exchanger 24 by the connecting pipe 25, and the supply air heated on the secondary side of the heat exchanger 24 Exhaust pipes 11 and 12 of the engine body 10
Supply bypass device 2 configured by connecting pipes 28a and 28b connecting the additional volume pipe 28 and the exhaust pipes 11 and 12, and a supply pipe connected to the branch pipe 18 branched from the supply passage 32. Air flow rate adjusting throttle device 35 provided in the air discharge passage 34, and this air flow rate adjusting throttle device 35
A heat exchanger 37 in which the supply air from the engine is introduced to the secondary side through the connecting pipe 36 and the exhaust gas from the engine body 10 is introduced to the primary side to recover exhaust gas waste heat, and this heat exchange. Pipe 38 connected to the secondary side of the heat exchanger 37 so that the hot air energy from the heat exchanger 37 is supplied to the outside of the turbocharged engine.
The hot air supply device 3 is composed of

If the heat exchanger 24 cannot be provided due to cost and installation space restrictions, a valve 29 is provided after the air flow control throttle device 20, that is, downstream of the air flow control throttle device 20. The connection pipe 30 described above is provided, the connection pipe 30 is connected to the additional volume pipe 28, and the air supply bypass device 2 that is in communication with the exhaust pipes 11 and 12 through the additional volume pipe 28 can be provided.

As shown in the figure, a turbocharged engine 1 equipped with a hot air supply device 3 of the present invention is an engine body 1 of an internal combustion engine.
A first exhaust pipe 11 consisting of exhaust pipes 11a, 11b, 11c connected to 0 and exhaust pipes 12a, 12b, 12
a second exhaust pipe 12 composed of c and the first and second exhaust pipes
A supercharger 13 having an exhaust turbine 14 having a reduced turbine area into which the exhaust gas flowing into each of the exhaust pipes 11 and 12 and an air compressor 16 connected to the exhaust turbine 14 via a shaft 15; Air compressor 1 of feeder 13
The air supply passage 32 is connected to the air supply outlet 17 via the air cooler 31 so that the air supply discharged from the engine 6 is supplied to the engine body 10 of the internal combustion engine.

The exhaust pipes 11 and 12 are respectively communicated with the exhaust turbine inlet of the exhaust turbine 16 of the supercharger 13, so that the exhaust gas from the exhaust pipes 11 and 12 is exhausted from the exhaust turbine inlet of the exhaust turbine 16, respectively. It is introduced into the turbine 16 to drive the exhaust turbine 16. The exhaust turbine 16 of the supercharger 13 is connected by a shaft 15 to an air compressor 16 for air supply. Therefore, the rotational energy absorbed by the exhaust turbine 16 is transmitted to the air compressor 16 of the supercharger 13 by the shaft 15, and the air compressor 16 compresses the intake air sucked from the atmosphere to output from the air supply outlet 17. It is consumed as energy sent to the air supply passage 32 through the air cooler 31.

The exhaust gas driving the exhaust turbine 16 of the supercharger 13 is introduced into the primary side of the heat exchanger 24 via the exhaust outlet of the supercharger 13 and the connecting pipe 39 connected to the exhaust outlet. .. A connecting pipe 40 is connected to the outlet of the heat exchanger 24, and is further connected to the primary side of another heat exchanger 37 via the connecting pipe 40. Therefore, heat is discharged from the exhaust outlet via the connecting pipe 39. The exhaust gas introduced into the exchanger 29 is further introduced into the heat exchanger 37 via the connecting pipe 40, and is discharged from the heat exchanger 37 to the atmosphere via the connecting pipe 41.

Further, the air supply outlet 17 of the air compressor 16 of the supercharger 13 is connected to the air supply passage 32 of the engine body 10 of the internal combustion engine via the air cooler 31 to supply air to the engine body 10. Can be introduced. Further, the air supply pipe 32
Is connected to another branch pipe 18 and is provided with an air supply bypass passage 19 and an air flow rate adjusting throttle device 20.
A part of the air supply is branched. Further, the air flow control expansion device 20 is connected to the secondary side of the heat exchanger 24 by a connecting pipe 21, a valve 22 and a connecting pipe 23, and a part of the branched supply air is supercharged in the heat exchanger 24. Thirteen
The exhaust gas from the exhaust turbine 14 is heated. The secondary side of the heat exchanger 24 is a connecting pipe 25.
And additional volume pipe 28 via valve 26 and connecting pipe 27
Is connected to the supercharger 13 and is branched from the supercharger 13 and heated by the heat exchanger 24 is introduced into the additional volume pipe 28 to introduce pressure energy of the supply air. Connection pipes 28a and 28b are connected to the additional volume pipe 28,
The heated supply air is introduced into the first and second exhaust pipes 11 and 12 of the engine body 10, and is supplied from the exhaust pipes 11 and 12 to the exhaust turbine 14 of the supercharger 13.

Exhaust gas that alternately flows into the first and second exhaust pipes 11 and 12 from the engine body 10 of the internal combustion engine causes a volume effect and a bypass effect of the additional volume pipe 28 connected by the connecting pipes 28a and 28b. In addition, the pressure wave is attenuated by the cushioning effect of a part of the supply air introduced into the additional volume pipe 28, a large heat drop is recovered by the exhaust turbine 14 having a small turbine area, and the supply air bypass device is provided. When 2 includes a heat exchanger 24, heat energy and pressure energy are added, and when the heat exchanger 24 is not provided and only the air supply bypass passage is provided, only pressure energy is added by a part of the air supply. As a result, the energy recovered by the exhaust turbine 14 is increased.

The rotational energy recovered by the exhaust turbine 14 is transmitted by the shaft 15 to the air compressor 16 of the supercharger 13, and the intake air sucked and compressed from the atmosphere by the air compressor 16 is cooled by the air supply outlet 17. While being sent from the air supply passage 32 to the engine body 10 of the internal combustion engine via the device 31, part of the air supply is sent from the branch pipe 18 to the air supply bypass device 2 as bypass air supply.

Similarly, the hot air supply device 3 is connected from the branch pipe 18. This hot air supply device 3 is a branch pipe 1
After a part of the other supply air sent from 8 flows into the connection pipe 34 via the valve 33 and the supply amount of supply air is regulated by the air flow control expansion device 35 provided in the connection pipe 34,
It is introduced from the connecting pipe 36 to the secondary side of the heat exchanger 37, in which the waste heat of the exhaust gas from the exhaust turbine 14 is recovered, converted into hot air, and appropriately supplied from the connecting pipe 38. ..

Therefore, in the exhaust gas from the exhaust turbine 14 of the supercharger 13, when the air supply bypass device 2 has the heat exchanger 24, waste heat is recovered in the heat exchanger 24 from the connecting pipe 39. After that, it is introduced into the primary side of the next heat exchanger 37 via the connecting pipe 40 and is heat-exchanged with the supply air of the hot air supply device 3 in the heat exchanger 37 to recover the waste heat of the exhaust gas and connect it. Emitted from the pipe 41 to the atmosphere. Further, when the heat exchanger 24 is omitted in the air supply bypass device 2 for reasons such as cost and installation space, the exhaust gas from the exhaust turbine 14 passes from the connection pipe 40 to the heat exchanger 37 via the connection pipe 39. This heat exchanger 37 is introduced on the primary side of
At, the heat is exchanged with the supply air of the hot air supply device 3, and the waste heat of the exhaust gas is recovered and released from the connecting pipe 41 to the atmosphere.

[0022]

According to the turbocharged engine having the hot air supply device of the present invention having the above-described structure, the air compressor of the turbocharger of the turbocharged engine is connected in parallel with the engine body of the internal combustion engine. An air supply bypass device is provided, and an increase in the discharge air supply of the air compressor of the supercharger due to a decrease in the flow resistance of the air supply After the amount is adjusted, the exhaust gas waste heat is recovered by the heat exchanger provided at the outlet of the exhaust turbine of the supercharger, and the heated supply air is mixed with the exhaust gas discharged from the engine body. Since the pressure energy and the heat energy of the heated charge air are added, and the flow rate of the gas introduced into the exhaust turbine of the supercharger is increased, the heat of the exhaust turbine having a small turbine area can be obtained. Greater head drop It can be.

Furthermore, even when a heat exchanger for recovering exhaust gas waste heat is not provided in the air supply bypass device due to reasons such as cost and installation space, exhaust gas discharged from the engine body and bypass air supply Are mixed to add pressure energy to the supply air, and the heat drop of the exhaust turbine is increased by the effect of increasing the flow rate of the exhaust turbine having a small turbine area. Therefore, when a part of the supply air supplied from the turbocharged engine to the outside is used as the energy of the hot air in which the exhaust gas waste heat is recovered by the heat exchanger provided at the exhaust turbine outlet, Because the amount of air supply increases due to the increase in the work of the air compressor of the engine, a part of the amount of air supply supplied to the outside of the turbocharged engine is increased, and the recovery amount of exhaust gas waste heat is also increased. In addition, the energy of hot air that can be supplied from the turbocharged engine is increased.

As described above, since the ratio of the hot air energy supplied to the outside to the output of the turbocharged engine is increased, the opportunity of using the hot air supply device for the load factor of the turbocharged engine is increased. At the same time, it is possible to obtain an effect such as energy saving by increasing the amount of waste heat used.
Heating at a temperature level of hot air of 200 ° C or higher,
By utilizing the characteristics of heating and air energy, energy saving effects such as humidity control and drying combined with an adsorption dehumidifier can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a turbocharged engine including a hot air supply device of the present invention.

[Explanation of symbols]

1 Turbocharged Engine 2 Air Supply Bypass Device 3 Hot Air Supply Device 10 Engine Body of Internal Combustion Engine 11, 11a, 11b, 11c, 12, 12a, 12
b, 12c Exhaust pipe 13 Supercharger 14 Exhaust turbine 15 Shaft 16 Air compressor 17 Air supply outlet 18 Branch pipe 19 Connection pipe 20 Air flow rate adjustment throttle device 21 Connection pipe 22 Valve 23 Connection pipe 24 Heat exchanger 25 Connection pipe 26 Valve 27 Connection pipe 28 Additional volume pipe 28a, 28b Connection pipe 31 Air cooler 32 Air supply passage 33 Valve 34 Air supply discharge passage 35 Air flow rate adjusting throttle device 36 Connection pipe 37 Heat exchanger 38 Connection pipe 39 Connection pipe 40 Connection pipe 41 Connection tube

Claims (1)

[Claims] 1. A turbocharged engine in which a turbine area of an exhaust turbine of a supercharger is reduced, and an air supply bypass branched from an air supply passage that connects an engine body of an internal combustion engine and an air compressor of the supercharger. An air flow rate adjusting throttle device provided in the passage, and a supply from the air supply bypass passage for recovering exhaust gas waste heat from the exhaust turbine of the supercharger, which is connected to the air flow rate adjusting throttle device via a connecting pipe. A supply air bypass device composed of a heat exchanger for heating the air and an additional volume pipe connected to the heat exchanger, and a supply air passage communicating with the air compressor of the supercharger. A supply air discharge passage, another air flow rate adjusting throttle device provided in the supply air discharge passage, and exhaust gas waste heat from the exhaust turbine of the supercharger connected to the air flow rate adjusting throttle device. Supply that flows through the supply air discharge passage by recovery There turbocharged engine characterized by comprising a hot air supply device, which is composed of a separate heat exchanger to be heated.