JPH0441932A - Hot air supply device for turbo supercharging engine with fuel combustion device - Google Patents

Abstract

PURPOSE:To increase hot air energy by providing a fuel combustion device in the middle of an air supply bypass passage branching from an air supply passage which connects an engine body to an air compressor of a supercharger, by mixing the combustion gas with an exhaust gas from the engine body, and by introducing it to an exhaust turbine. CONSTITUTION:In this hot air supply device 2 in a turbo supercharging engine 1, an air flow regulating valve 20 is provided in an air supply bypass passage 19 branching from an air supply passage 27 which connects an engine body 10 to an air compressor 16 of a supercharger 13, and a fuel combustion device 22 is provided at the lower stream of this air flow regulating valve 20. And a mixed gas of combustion gas from this fuel combustion device 22 and an exhaust gas from the engine body 10 is introduced to an exhaust turbine 14 of the supercharger 13 by a manifold 23. Also, a supplied air discharge passage 29 branches from the air supply passage 27 connected to the air compressor 16 of the supercharger 13, and at the lower stream of this supplied air discharging passage 29, a heat exchanger 30 is provided for heating supplied air by an exhaust gas from a connecting pipe 33 connected to an exhaust outlet of the exhaust turbine 14 of the supercharger.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] This invention provides hot air supply for an internal combustion engine with an exhaust turbocharger (hereinafter referred to as a turbocharged engine) equipped with a fuel combustion device (hereinafter referred to as a combustion device). It is related to the device.

[Prior Art] Conventionally, the turbine area of the exhaust turbine of a supercharger driven by the exhaust gas of a turbocharged engine is reduced to increase the heat drop of the exhaust gas energy recovered by the exhaust turbine, thereby increasing the efficiency of the supercharger. A method is adopted in which a portion of the air taken in and discharged by the air compressor is supplied to the outside of the turbocharged engine, and the remaining air is used to satisfy the performance and output of the engine itself. Part of the air supplied to the outside of the turbocharged engine recovers waste heat from the exhaust gas through a heat exchanger installed at the turbocharger outlet and sends it to the vessel as hot air energy to reduce the humidity of the vessel. There are examples where it is used for controlled drying.

[Problems to be Solved by the Invention] However, in the case of humidity adjustment and drying in such a ship, a part of the supply air supplied to the outside from the turbocharged engine supercharges the exhaust energy from the engine body. Since it is the pressure energy of the air recovered and converted by the machine, the amount changes depending on the output of the turbocharged engine, and as a result, it cannot meet the demand load of humidity adjustment and drying on ships, both in terms of heat and time. There are cases. In other words, the turbocharged engine may stop or operate at low load due to the ship's berthing at a waiting port at its destination port, evacuation berthing at a port other than the destination port due to poor weather or sea conditions during transit, or slowing down sailing to adjust time, etc. Therefore, there are disadvantages such as cases where exhaust gas energy cannot be obtained or is reduced and cannot meet the load demand.

Therefore, an object of the present invention is to reduce the turbine area of the exhaust turbine of the supercharger of a turbocharged engine to reduce the thermal drop of the exhaust gas energy recovered by the exhaust turbine, in order to solve these conventional problems. By increasing the size, it is possible to supply part of the air discharged from the air compressor of the turbocharger to the outside of the turbocharged engine during normal load, and the air supply passage that communicates with the air compressor of the turbocharger. An air flow control valve and a fuel combustion device are installed in the air supply bypass passage that branches from the engine, and during low-load operation of the turbocharged engine, the combustion gas from the reheating combustion of the fuel combustion device is mixed with the exhaust gas from the engine body. The air is introduced into the exhaust turbine of the turbocharger to increase the output of the exhaust turbine, thereby increasing the amount and pressure of air supplied from the air compressor of the turbocharger. By increasing the gas volume and exhaust temperature, the amount of supply air supplied to the outside of the turbocharged engine and the amount of waste heat recovered from the exhaust gas recovered by the heat exchanger installed at the outlet of the turbocharger are increased. By increasing the hot air energy supplied to the ship, the humidity control and drying ability can be satisfied. In addition, even during normal load operation, if the hot air energy and air supply required for humidity adjustment and drying of the ship are insufficient due to the relatively low output of the turbocharged engine, the combustion gas is generated by reheating the fuel combustion device. An object of the present invention is to provide a hot air supply device for a turbocharged engine equipped with a fuel combustion device capable of supplementing energy by supplying energy to an exhaust turbine of a supercharger.

[Means for Solving the Problems] According to the present invention, a hot air supply device for a turbocharged engine equipped with a fuel combustion device communicates between the engine body of the internal combustion engine and the air compressor of the supercharger. In a turbocharged engine having an air intake bypass passage branching from an air intake passage, an air flow rate control valve provided in the air intake bypass passage, a fuel combustion device provided after the air flow rate adjustment valve, and the fuel combustion device a connecting pipe that mixes combustion gas from the engine and exhaust gas from the engine main body and introduces the mixture into the exhaust turbine of the supercharger, and an air supply branching from an air supply passage that communicates with the air compressor of the supercharger. The present invention is characterized in that it includes a heat exchanger that is arranged after the air discharge passage and the supply air discharge passage and heats the supply air with the exhaust gas from the exhaust turbine outlet of the supercharger.

[Function] According to the above-described means of the present invention, a part of the charge air is taken out to the outside of the turbocharged engine during low load operation and regular load operation of the turbocharged engine, and a part of the charge air is provided at the turbocharger outlet. When exhaust gas waste heat is recovered and used as hot air energy for supply air using a heat exchanger, it is branched from the supply air passage that communicates between the engine body and the air compressor of the supercharger in order to increase the heat energy and the amount of supply air. A portion of the bypass supply air that passes through an air flow control valve installed in the supply air bypass passage is used for combustion air to be mixed with the fuel introduced in the fuel combustion device, and the other portion is used to cool the fuel combustion device. At the same time, the combustion gas is diluted and mixed with the exhaust gas from the engine main body downstream, and then the exhaust turbine of the supercharger is driven to absorb the work of the combustion gas of the fuel supplied from the fuel combustion device into the turbocharger. The air compressor increases the air supply pressure and air intake, which also increases the exhaust gas amount and exhaust temperature at the exhaust turbine outlet of the supercharger.
The amount of air supplied to the outside of the turbocharged engine is also increased, and the amount of exhaust gas waste heat recovered by the heat exchanger installed at the exhaust turbine outlet of the turbocharger is also increased. Energy can be increased.

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

[Actual Example] As shown in the drawings, the hot air supply device 2 of the turbocharged engine 1 equipped with the fuel combustion device of the present invention has an engine main body 1o of the internal combustion engine, an air compressor 16 of the supercharger 13, In a turbocharged engine 1 having an air supply bypass passage #819 which is connected to an air supply passage 27 and branched, an air flow control valve 2o provided in the air supply bypass passage 19, and an air flow control valve 2o provided in the air supply bypass passage 19 a fuel combustion device 22 provided after or downstream;
A connecting pipe 23 that mixes the combustion gas of this fuel combustion device 22 and exhaust gas from the engine body 10 of the internal combustion engine and introduces the mixture into the exhaust turbine 14 of the supercharger 13 communicates with the air compressor 116 of the supercharger 13. A supply air discharge passage 29 branches from the supply air passage 27, and the supply air is supplied by exhaust gas from a connecting pipe 33 provided downstream of the supply air discharge passage 29 and connected to the exhaust outlet of the exhaust turbine 14 of the supercharger 13. heat exchanger to heat
It is mainly composed of 11830.

As shown in the figure, a turbocharged engine 1 equipped with a hot air supply device 2 of the present invention has an engine body 10 of an internal combustion engine, and exhaust pipes 11a, llb, 11 connected to the engine body 0, respectively.
The first exhaust pipe 11 and exhaust pipes 12a and 12b consisting of c.
, 12c, an exhaust turbine 14 into which the exhaust gases flowing into the first and second exhaust pipes 11, 12, respectively, are introduced, and the exhaust turbine 14 and the shaft 15.
A supercharger 13 with an air compressor 16 connected via
and an air supply passage 27 connected to the air supply outlet 17 via an air cooler 26 so as to supply air sucked in by the air compressor 16 of the supercharger 13 to the engine body 10 of the internal combustion engine. ing.

Air supply passage 27 connected to air supply outlet 17 of air compressor 16 of supercharger 13 of turbocharged engine 1 configured in this manner
An air supply bypass passage 19 is branched from the air supply bypass passage 19 via a branch pipe 18, and an air flow rate control valve 20 is provided in one of the air supply bypass passages. A fuel combustion device 22 having a tube 32 is provided. These first and second exhaust pipes 11.12
The fuel combustion device 22 is connected to the exhaust turbine 1 of the supercharger 13 through a connecting pipe 23 consisting of a connecting pipe 24 and an additional volume pipe 25.
The exhaust gas from the first and second exhaust pipes 11 and 12 and the combustion gas from the fuel combustion device 22 are connected to the supercharger 13.
The exhaust gas is introduced into the exhaust turbine 14 of the engine. The exhaust gas that has alternately flowed into the first and second exhaust pipes 11.12 passes through the first and second exhaust pipes 11.1 at the inlet of the exhaust turbine 14 of the supercharger 13.
2 and the combustion gas from the fuel combustion device 22 to the exhaust turbine 1
The pressure wave is attenuated by the volume effect and bypass effect of the additional volume pipe 25.25 that connects the connecting pipe 24 to the connecting pipe 23 introduced into the exhaust gas turbine 4, and the heat drop recovered by the exhaust turbine 14 having a small turbine area is increased. I can do it.

The rotational energy recovered by this exhaust turbine 14 is transferred to the shaft 15.
The air is transmitted to the air compressor 16 of the supercharger 13, and the air compressor 16 compresses the air sucked in from the atmosphere, and from the air air outlet 17, via the air cooler 26, and from the air air intake passage 27 to the internal combustion engine r! At the same time, part of the air supply is branched from the branch pipe 18 and sent to the air supply bypass passage 19 as bypass air supply. Similarly, the branch pipe 18 is connected to a supply air discharge port 118 via a valve 28.
29 is connected, and the other part of the supply air sent into this supply air discharge passage 29 is introduced into the secondary side of the heat exchanger 3o, and the waste heat of the exhaust gas exiting the exhaust turbine 14 is absorbed. It is collected, converted into hot air, and supplied from the connecting pipe 31. Therefore, the exhaust gas from the exhaust turbine 14 of the supercharger 13 is introduced into the primary side of the heat exchanger 3o via the connecting pipe 33 and the expansion joint 34, and the supply air is discharged through the heat exchanger 3o.
71B 29, waste heat of the exhaust gas is recovered and released to the atmosphere through the connecting pipe 35.

As shown in the diagram, when the load on the engine body 1o of the internal combustion engine is low, or when the output of the engine body 1o is small relative to the demand load of hot air energy, the flow out from the engine body 1o of the internal combustion engine is shown. Each exhaust pipe 1 of the first exhaust pipe 11
]-a, llb, llc and each exhaust pipe 12a, 12b12c of the second exhaust pipe 12, supercharging I! Since the exhaust gas energy introduced into the exhaust turbine 14 of 13 is insufficient, the rotational energy recovered by the exhaust turbine 14 is transmitted to the air compressor 16 by the shaft 15, but the air compressor 16 draws in air from the atmosphere. As a result, heat is released from the air supply outlet 17 of the air compressor 16 via the branch pipe 18, the valve 28, and the air supply discharge passage 29. The supply air heated by recovering waste heat in the exchanger 30 also lacks the waste heat of the exhaust gas flowing out from the exhaust turbine 14, so the recovered waste heat is small, and the connecting pipe 31
Both the energy and volume of the hot air, which is obtained by converting a portion of the supply air supplied from the source, will be insufficient.

Therefore, in this case, the air supply outlet 17 of the air compressor 16
The supply air whose flow rate is adjusted by the air flow control valve 20 is passed through the supply air bypass passage 19 from the connecting pipe 2 to the fuel combustion device 22.
The combustion gas obtained by reheating and combustion together with the fuel supplied from the outside through the fuel supply pipe 32 is transferred to the first and second exhaust pipes 1 through the connecting pipe 24 of the connecting pipe 23 for combustion gas.
1.12 and the engine body of the internal combustion engine through flow paths connected with additional volume pipes 25 and 25 respectively. ．．
12, and is introduced from the connecting pipe 24 of the connecting pipe 23 of the fuel combustion device 22 and passes from the exhaust turbine 14 through the shaft 15 to supplement the insufficient rotational energy and increase the compression work of the air compressor 16. , the pressure and amount of the supply air introduced into the heat exchanger 30 through the branch pipe 18, the valve 28, and the supply air discharge passage 29 are increased, and the amount and temperature of the exhaust gas flowing out from the exhaust turbine 14 are increased. The waste heat recovered by the heat exchanger 30 also increases, making it possible to compensate for the shortage of hot air energy and air volume supplied from the connecting pipe 31.

As shown in the figure, the exhaust gas flowing out of the exhaust turbine 14 is introduced into the primary side of the heat exchanger 30 via a connecting pipe 33 and an expansion joint 34, and after waste heat is recovered by supply air on the secondary side, the exhaust gas is connected. It is discharged to the atmosphere through pipe 35.

[Effects of the Invention] As described above, according to the hot air supply device for a turbocharged engine equipped with the fuel combustion device of the present invention, even when the turbocharged engine is operated in a low load range, the air compression of the turbocharger can be improved. After installing an air supply bypass passage that bypasses the engine body of the internal combustion engine from the aircraft and adjusting the amount of bypass air supply with an air flow control valve, the combustion gas that uses the bypass air supply as combustion air for the fuel combustion device is transferred to the engine body. By mixing with the exhaust gas from the turbocharger and supplying it to the exhaust turbine of the turbocharger, a part of the charge air amount and pressure to be supplied to the outside of the turbocharged engine can be obtained, and at the same time, the exhaust gas of the turbocharger By obtaining an increase in the amount of waste heat of the exhaust gas flowing out from the turbine, the temperature and air volume of the hot air converted from a part of the supply air supplied to the outside of the turbocharged engine by the heat exchanger installed at the exhaust turbine outlet are increased. allow to increase. In addition, when operating a turbocharged engine in the normal load range, by reducing the turbine area of the exhaust turbine of the turbocharger, the heat drop in the exhaust turbine is increased and a portion of the charge air is transferred outside the turbocharged engine. When the energy and air volume of the hot air, which is extracted from exhaust gas waste heat and recovered by a heat exchanger installed at the exit of the exhaust turbine, is insufficient for the demand load, an air supply binox passage bypasses the engine main body. The energy and volume of the hot air can be increased and supplemented by mixing the reheated combustion gas from the fuel combustion device installed in the engine with the exhaust gas flowing out from the engine body and supplying the mixture to the exhaust turbine of the supercharger.

Therefore, even when part of the air supplied to the outside from a turbocharged engine is used as the energy of hot air, which is the waste heat of the exhaust gas recovered by the heat exchanger installed at the exhaust turbine outlet, the turbocharger I! ! By making it possible to supply the necessary amount of hot air energy and air volume regardless of the load on the engine, it eliminates the inconveniences of hot air supply devices for turbocharged engines that use waste heat, which is the original purpose, and creates opportunities to use waste heat. Effects such as energy saving can be obtained by increasing the temperature of the hot air at 200°C.
At the above temperature level, heating, space heating, and even humidity control in combination with an adsorption dehumidifier that takes advantage of the characteristics of air energy,
This provides an energy saving effect for drying purposes, etc.

[Brief explanation of the drawing]

The drawing is a schematic diagram of a hot air supply device for a turbocharged engine equipped with a fuel combustion device of the present invention.In Figure 6, 1: turbocharged engine; 2: hot air supply device;
, 11, lla, llb, 11c, 12.12a, 12
b, 12c: exhaust pipe, 13: supercharger, 14: exhaust turbine, 15: shaft, 16: air compressor, 17: air supply outlet, 1
8: Branch pipe, 19: Air supply bypass passage, 20: Air flow rate control valve, 21; Connecting pipe, 22 - Fuel combustion device, 23 Two connecting pipes, 24: Connecting pipe, 25: Load volume pipe, 26: Air cooling vessel, 27: air supply road, 28: valve, 29; air supply discharge passage, 30: heat exchanger, 31.33.35: connecting pipe, 34:
Expansion joints.

Claims (1)

[Scope of Claims] In a turbocharged engine having an air intake bypass passage that branches from an air intake passage that communicates the engine body of the internal combustion engine with an air compressor of a supercharger, the turbocharged engine is provided in the air intake bypass passage. An air flow control valve, a fuel combustion device provided after the air flow control valve, and a connection that mixes combustion gas from the fuel combustion device and exhaust gas from the engine main body and introduces the mixture into the exhaust turbine of the supercharger. A supply air discharge passage branching from a supply air passage communicating with the air compressor of the supercharger, and a supply air discharge passage provided after the supply air discharge passage and supplied with exhaust gas from the exhaust turbine outlet of the supercharger. A hot air supply device for a turbocharged engine equipped with a fuel combustion device, characterized in that it is equipped with a heat exchanger that heats air.