JPH029906A - Exhaust gas energy recovering device of turbosupercharge engine - Google Patents

Abstract

PURPOSE:To effectively utilize the exhaust energy by driving an air compressor unit for driving an exhaust turbine by a portion of exhaust gas and raising the temperature of the compressed air by the exhaust gas and cooling the compressed air by an air refrigerator which utilizes the compressed air as driving source. CONSTITUTION:An exhaust collecting tank 29 is installed midway in an exhaust bypass passage 5 branched from the exhaust pipes 11 and 12 which communicate to an engine body 10 and the exhaust turbine 16 of a supercharger 13, and an air compressor unit 34 for driving the exhaust turbine is installed on the downstream side of the tank 29 through an exhaust flow rate adjusting throttle device 30. The air whose pressure is increased by the air compressor 37 of the unit 34 is heated by an air heating device 19 which utilizes the exhaust gas at the outlet of the exhaust turbine of the super charger 13 as heating source, and the compressed air after heating and the atmosphere are mixed, and the warm air whose temperature is adjusted is blown into a car com partment from a blower device 52. Further, the air which is compressed and discharged from the air compressor 37 is cooled by an air refrigerator 58 consisting of an air compressor 59, air cooler 61, etc., and then mixed with the atmosphere, and cold air is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an exhaust gas energy recovery device for an internal combustion engine with an exhaust turbocharger (hereinafter referred to as a turbocharger).

2. Description of the Related Art Conventionally, as a device for recovering exhaust gas energy from a turbocharged engine, an exhaust gas boiler or an exhaust turbine is usually provided to recover and utilize the exhaust gas energy as thermal energy or motive energy.

In addition to the problems that the invention aims to solve, when an exhaust gas boiler is installed in such a conventional device, complicated water supply equipment, pneumatic equipment, condensation equipment, etc. are required to recover water vapor energy. In addition, it is widely known that there are drawbacks such as the fact that the heat transfer surface of the exhaust gas boiler that comes into contact with the exhaust gas is susceptible to corrosion due to the sulfuric acid content in the exhaust gas.

In addition, if an exhaust turbine is installed to recover high-speed power energy, in addition to the exhaust turbine, a shock absorber and a speed reducer for the fluid coupling are required. Normally, it is used only for turbocharged engines.

Therefore, the purpose of the present invention is to solve these conventional problems by creating a simple and inexpensive device that can effectively utilize exhaust gas energy even in small-output turbocharged engines by recovering exhaust gas energy. An object of the present invention is to provide an exhaust gas energy recovery device for a turbocharged engine.

Means for Solving the Problems According to the present invention, in order to achieve the above-mentioned object, an exhaust gas energy recovery device for a turbocharged engine connects the engine body of an internal combustion engine and the exhaust turbine of a supercharger. In a supercharged engine having an exhaust bypass passage branching from a communicating exhaust pipe, an exhaust gas collecting tank in the exhaust bypass passage, an exhaust flow rate regulating throttle device after the exhaust collecting tank, and a switching valve after the exhaust collecting tank are used. an exhaust turbine-driven air compression unit consisting of an exhaust turbine driven by exhaust gas energy and an air compressor connected to and driven by the exhaust turbine; an air heating device that heats compressed air with exhaust gas from the exhaust turbine outlet of the supercharger; a heat exchanger that heats fluid via a switching valve after the air heating device; The air blower is equipped with an air blower that sends hot air by mixing it with the atmosphere and adjusting the temperature, and the air blower is configured to cool the air compressor by an air chiller that is composed of an air compressor, an air cooler, and an air expander. It is characterized by being able to send discharged compressed air whose state has been changed to a low temperature and mix it with the atmosphere to send temperature-controlled cold air.

According to the means of the present invention, in a turbocharged engine equipped with an exhaust bypass passage branching from an exhaust pipe that communicates the engine body of the internal combustion engine and the exhaust turbine of the supercharger,
Exhaust gas at a flow rate adjusted by the exhaust gas flow rate regulating device is introduced into the exhaust turbine through the exhaust collection tank in the exhaust bypass passage, and the air compressor connected to the exhaust turbine is driven to convert the air taken in from the atmosphere. converting it into compressed air, and recovering exhaust gas waste heat at the exhaust turbine outlet of the supercharger from the primary side on the secondary side of an air heating device that communicates with the air compressor using the compressed air as a heat medium; The fluid from the primary side to the secondary side of the heat exchanger connected after the air heating device is heated via the switching valve. The compressed air that has radiated heat in the heat exchanger is introduced into the engine body through the switching valve and serves as air supply.

Furthermore, the compressed air introduced into the blower device connected after the air heating device through the other switching valve is mixed with air drawn from the atmosphere by the blower and whose flow rate is regulated by the damper. The temperature is regulated and hot air is sent through the ducts. In this case, the pressure energy of the compressed air is used as blowing energy.

In addition, the compressed air introduced into the compressor of the air refrigerator, which is connected through the other switching valve connected after the air compressor, is heated and pressurized by the compressor of the air refrigerator, and is then cooled. The temperature of the cooled air is adjusted by the air expander, which then enters the air expander and performs expansion work to drive the air compressor of the air refrigerator connected to the air expander, and the low-temperature air is passed through the switching valve to the blower. The air is introduced into the air, mixed with atmospheric air whose flow rate is controlled by a damper, and is then effectively used.

In this way, the turbine area of the supercharger of a turbocharged engine using dynamic pressure supercharging is reduced, and the exhaust gas is alternately exhausted from multiple exhaust pipes that connect the exhaust turbine of the supercharger and the engine body of the internal combustion engine. Gas flows in in a pulsating manner. The exhaust gas whose flow rate is regulated by the exhaust flow rate regulating throttle device installed after the exhaust collecting tank is introduced into the exhaust turbine via the switching valve, performs expansion work, and then becomes the exhaust gas at the exhaust turbine outlet of the supercharger. join with. The expansion work absorbed by the exhaust turbine is transmitted from the exhaust turbine as rotational energy by the shaft and drives the air compressor, which heats and pressurizes the air taken in from the atmosphere and sends the compressed air out of the connecting pipe at the air compressor outlet. The compressed air that has passed through one of the two switching valves provided in the connecting pipe is introduced into the secondary side of the air heating device provided at the exhaust turbine outlet of the turbocharger through the connecting pipe, and is heated by the exhaust gas passing through the primary side. After being heated, it is introduced into the primary side of the heat exchanger through two switching valves provided in the connecting pipe at the outlet of the air heating device, and after it plays the role of a heat medium that heats the fluid passing through the secondary side. The high temperature that is introduced into the air supply pipe of the internal combustion engine through the switching valve at the outlet of the heat exchanger and serves as supply air is supplied to the blower device via the other switching valve provided in the connecting pipe at the outlet of the air heating device. The compressed air is sucked in by the blower of the blower, mixed with air from the atmosphere whose flow rate is regulated by a damper, and sent from the duct as warm air, and the pressure energy of the compressed air at this time serves as blast energy. Also,
The compressed air is introduced into the air chiller, which consists of an air compressor, an air cooler, and an air expander, through the other switching valve provided on the connecting pipe at the air compressor outlet, and is further heated and pressurized by the air compressor. After that, the air is cooled in an air cooler to adjust the temperature. After that, an air expander performs expansion work, and the rotational energy absorbed by the air expander is conducted by the shaft and converted into energy for heating and pressurizing the air compressor. As it is reduced, it becomes low-temperature, low-pressure air, which is introduced into the blower via the switching valve provided in the connecting pipe at the outlet of the air cooler, where the blower of the blower absorbs it and mixes with air from the atmosphere whose flow rate is regulated by a damper. The temperature is then adjusted and sent through the duct as cold air. In addition, the rotational energy that the turbocharger's exhaust turbine absorbs from the exhaust gas can be maintained at the same level as before even if the exhaust gas is bypassed, since reducing the turbine area increases the heat drop of the exhaust gas at the exhaust turbine. Therefore, the amount of air supplied to the engine body can be maintained at the same level as before.

Other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Embodiment As shown in the drawings, an exhaust gas energy recovery device 1 for a turbocharged engine according to the present invention includes an exhaust pipe 11 that communicates an engine body 10 of an internal combustion engine with an exhaust turbine 16 of a supercharger 13.
．． In a turbocharged engine 2 having an exhaust bypass passage 5 branching from the exhaust bypass passage 12, an exhaust collection tank 29 in the exhaust bypass passage 5, an exhaust flow rate adjustment throttle device 30 after the exhaust collection tank 29, and an exhaust gas flow rate adjusting throttle device 30 after the exhaust collection tank 29. An exhaust turbine driven air compression unit 34 consisting of an exhaust turbine 35 driven by exhaust gas energy via a switching valve 32 and an air compressor 37 connected to the exhaust turbine 35 by a shaft 36 and driven; One air heating device heats air sucked in from the atmosphere and compressed by the air compressor 37 of the compression unit 34 with exhaust gas from the exhaust turbine outlet of the supercharger 13, and a switching valve 44 is installed after this one air heating device. Rebun Shiban 45, which heats the δ nine bodies through the air heating device, mixes the compressed air heated with one air heating device and the atmosphere to raise the temperature! The air refrigeration unit U!58 is mainly composed of a blower device 52 that sends hot air at intervals, and consists of five air compressors, an air cooler 61, and one indoor air cooler (I!6B).
By this, the compressed air discharged from the air compressor 37 can be mixed with the atmosphere and the temperature-controlled cold air can be sent.

As shown in the figure, the exhaust gas energy recovery device 1 for a turbocharged engine of the present invention is connected to an engine body 10 of an internal combustion engine of a turbocharged engine 2 to which the exhaust gas energy recovery device 1 is branch-connected, and an engine body 1o. an exhaust turbine 1 into which exhaust gas from the exhaust pipe 11.12 is introduced from the exhaust turbine 14.15;
6 and this jJF air turbine 16 and the air compressor tI connected by the shaft 21! 122, a supercharging U further 13,
An air supply connected to the outlet casing 17 of the exhaust turbine 16 of the supercharger 13 via an exhaust pipe 18 (1 device and air supply amount 1 of the air pressure lit vi 22 of the supercharger 13) 2
3, an air supply pipe 26 of the engine body 10 connected to the air supply pipe 24 via an air cooler 25,
Connecting pipes 27 and 28 of the exhaust bypass passage 5 branched and connected to the exhaust pipes 11 and 12 of the engine body 10 of the turbocharged engine 2
The two exhaust collecting tanks in the exhaust bypass passage 5 are connected so that exhaust gas is introduced by the exhaust! 13go 4
t'? 29, and this exhaust gas flow regulating throttle device 30 in the exhaust bypass passage 5 is followed by an exhaust gas flow regulating throttle device 30 connected to the outlet of Q) exchange valve 32 and a connecting pipe 33. An exhaust turbine-driven air compression unit 34 having an exhaust turbine 35 into which gas is introduced and an air compressor 37 connected to the exhaust turbine 35 via a shaft 36; Jli1!1137 is connected to a connecting pipe 39 through which compressed air is drawn from the atmosphere and sent out, through an LJj switching valve 41 and a connecting pipe 42, and the air is introduced into the secondary side of one unit and heated. The heat exchanger 2ii 45 into which compressed air is introduced via the switching valve 44 and the exhaust turbine 11 (the air pressure Jlii fi 37 outlet of the air pressure unit 34) are connected to the three V-pipes and the switching valve 4o.
An air refrigerator 58 having five air compressors, an air cooler 61, and a ±air expander 63 connected through the air refrigerator 58, a connecting pipe 65 connected to the outlet of the air expander 63 of the air refrigerator 58, and a switching valve. 66 and the blower 5 connected via the connecting pipe 51
3, a damper 54, and a mixing chamber 55.
It is made up of spikes.

As shown in the figure, in the exhaust gas energy recovery device 1 for a turbocharged engine of the present invention configured in this manner, the exhaust gas flowing out from the engine body 10 of the internal combustion engine is connected to the engine body 10 respectively. a first exhaust pipe 11 consisting of exhaust pipes 11a, llb, llc, and exhaust pipes 12a, 12b, 1;
A second exhaust pipe 12 consisting of 2c and an exhaust turbine 16 of the supercharger 13 via an exhaust turbine 14.15 respectively.
It drives the exhaust turbine 16, drives the supply air compressor 22 through the shaft 21 to suck in atmospheric air, compresses the intake air, and connects it from the supply air outlet 23 to the supply pipe. 24
send to. The exhaust gas that drove the exhaust turbine 16 of the supercharger 13 is sent to the outlet chamber 17 of the supercharger 13 and the exhaust outlet pipe 18.
The air is discharged into the atmosphere from the exhaust pipe 20 through the primary side of one air heating device connected to the exhaust outlet pipe 18. Further, the air intake sucked by the air compressor @ 22 of the supercharger 13 is introduced from the air intake outlet 23 through the air air intake pipe 24 into the air cooler 25 and the air air intake pipe 26 of the engine body 10, and is then introduced into the engine of the internal combustion engine. Air is supplied to the main body 10.

Further, a part of the exhaust gas introduced into the exhaust collecting tank 29 by the connecting pipe 27.28 of the exhaust bypass passage 5 connected to the exhaust pipe 11.12 of the engine body 10 of the internal combustion engine is transferred to the exhaust collecting tank 29. After the flow rate is adjusted by the exhaust gas flow rate regulating device 30 at the outlet, it is passed through the switching valve 32 to the connecting pipe 33.
The exhaust turbine 35 of the exhaust turbine drive air compression unit 34 is driven, and the exhaust turbine 16 of the supercharging 8113 is driven from the connecting pipe 38 to join the exhaust gas flowing out from the outlet casing 17 at the exhaust outlet pipe 18. Ru.

The rotational energy absorbed by the exhaust turbine 35 of the exhaust turbine-driven air compression unit 34 is transmitted by the shaft 36 to drive the air compressor 37, which heats and pressurizes the air taken in from the atmosphere and supplies it as compressed air to three connecting pipes. send out. When only the switching valve 41 of the switching valves 40 and 41 provided in the three connecting pipes is opened, the compressed air from the air compressor 37 of the exhaust turbine-driven air compression unit 34 is transferred from the connecting pipe 42 to the air heating device 1. The exhaust outlet pipe 18 that is introduced into the two secondary sides and passes through the primary side is heated by the exhaust gas released into the atmosphere from the exhaust pipe 20 through one air heating device, becomes high temperature, and flows into the connecting pipe 43. Ru. Further, the connecting pipe 43 is provided with a switching valve 44.5o, but when only the switching valve 44 is opened, high temperature compressed air is introduced into the heat exchanger H45 and sent to the heat exchanger 45 by the pump device 46. The fluid is heated and sent out from the air compressor 22 of the supercharger 13 through the connecting pipe 47, the switching valve 48, and the four connecting pipes, and merges with the air supply flowing into the air supply pipe 24 through the air supply outlet 23. After being cooled and temperature-controlled in an air cooler 25, the air is supplied to the engine main body 1o through an air supply pipe 26.

On the other hand, when the high temperature compressed air flowing in from one air heating device opens only another switching valve 50 provided in the connecting pipe 43, the blower 53 flows through the connecting pipe 51 into the mixing chamber 55 of the blower device 52. Air is sucked in from the atmosphere, the flow rate of which is regulated by a damper 54, and the mixture is induced and sent out from a duct 56 as warm air.

Further, compressed air from the outlet of the air compressor 37 of the exhaust turbine-driven air compression unit 34 is transferred to the air refrigerator 5 when only the other switching valve 40 provided in the three connecting pipes is opened.
The air is introduced into the five air compressors No. 8, the temperature and pressure are increased, and the connecting pipe No. 6
0 flows into the air cooler 61, where the cooling temperature is adjusted, and is introduced into the air expander 63 through the connecting pipe 62, where it performs expansion work and supplies rotational energy to the five air compressors through the shaft 64. The air becomes the connecting pipe 65 and the switching valve 66.
Air is sucked in from the atmosphere by the blower 53 in the mixing chamber 55 of the blower device 51 via the connecting pipe 51, and the flow rate is adjusted by the damper 54.The air is then mixed into the duct 56 as cold air whose temperature is adjusted.
sent from.

Effects of the Invention As described above, the exhaust gas energy recovery device for a turbocharged engine of the present invention takes advantage of recent improvements in performance of superchargers and improvements in matching technology between internal combustion engines and superchargers. By reducing the turbine area of the turbocharger and increasing the p head in the exhaust turbine of the exhaust gas, the exhaust gas energy recovery block (ζ) is improved.
(Constriction pressure JIW work) is maintained at the same level as before to maintain the supply of air to the engine body of the internal combustion engine, and by supplying bypass exhaust gas to the exhaust bypass 'device, a new exhaust turbine and The energy of the bypass exhaust gas is converted into pressure by an air compressor.
In addition to converting it into air energy, an air heating f:! The pressure 11 which recovered the IIF heat of the exhaust gas and became high temperature
6 Air heat exchanger 2S allows to heat the fluids: fuel T'1 heavy oil, lubricating oil, ice and snow; 5 after pressure 14th
The air energy can further be utilized as JΔ air in the U1 engine body of the internal combustion engine. In addition, an air heating device installed at the exhaust turbine outlet to supercharge exhaust gas
GoE collects J4 (to introduce high temperature, pressure 116 air into the blower).

It mixes with the atmosphere and generates heating as warm air.
If it can be used for the purpose of l+ /, "I '+'," the pressure 116 air energy can be used as ventilation energy.Furthermore, the compressed air is introduced into an air refrigerator and converted to low-temperature air. It can be supplied to an air blower, mixed with the atmosphere, and supplied as cold air for cooling purposes, etc.

[Brief explanation of the drawing]

The drawing is a schematic diagram of the exhaust gas energy recovery device of the turbocharged engine of the present invention; 1: Exhaust gas energy recovery device; 2: Turbocharged engine; 5: Exhaust bypass passage; 10: Engine body of internal combustion engine, 11.12: Exhaust pipe,
13: Supercharger, 14.15: JJF air turbine input [I
, 16.35: Exhaust turbine, 18: Exhaust outlet pipe, 1: Air heating device, 20: Exhaust pipe, 21.36.611.
Axis, 22: Pneumatic pressure J17 Sawa, 23 Air supply 1''-Blaze,
271.26: Air supply pipe, 25: Air cooler, 27.2
8: Connecting pipes, two groups! 1111.30. Exhaust gas flow M regulating restrictor, 31.33.38.39, /l
2.113.47.49.51.57.60.62.6
5: Connection IA pipe, 32.110.41.44.48.50
．． 66: Switching 4r, 34: Exhaust turbine driven air compression unit, 37.5: Air compressor, 45: Heat exchanger, 4
6: Pump device, 52: Air blower, 53 Niblower, 5.
1 damper, 55: mixing chamber, 56・dakl=, 58 air refrigerator, 61. Air cooler, 63. Air expansion cost.

Claims (1)

[Claims] In a supercharged engine having an exhaust bypass passage branching from an exhaust pipe that communicates the engine body of the internal combustion engine and an exhaust turbine of a supercharger, an exhaust collecting tank in the exhaust bypass passage and an exhaust flow rate adjustment after the exhaust collecting tank an exhaust turbine-driven air compression unit consisting of a throttling device, an exhaust turbine driven by exhaust gas energy after the exhaust collecting tank via a switching valve, and an air compressor connected to and driven by the exhaust turbine; An air heating device that heats the air sucked from the atmosphere and compressed by the air compressor of the drive air compression unit using exhaust gas from the exhaust turbine outlet of the supercharger; and after the air heating device, fluid is supplied through a switching valve. It is equipped with a heat exchanger for heating, a blower device that mixes the heated compressed air with the atmosphere, adjusts the temperature, and sends warm air, and the blower device includes an air compressor, an air cooler, and an air expander. Exhaust air of a turbocharged engine, characterized in that the compressed air discharged from the air compressor is changed to a low temperature by an air refrigerator, and is mixed with the atmosphere to send temperature-controlled cold air. Gas energy recovery equipment.