JPS59515A - Exhaust gas processing device of internal-combustion engine with exhaust gas turbine supercharger - Google Patents

Abstract

PURPOSE:To improve the combustion when the engine is operated at a low speed or under a low load and provide a high power engine by introducing an exhaust gas into a bypass passage and attempting to obtain complete combustion of the engine by an after-burner unit and a catalyst part. CONSTITUTION:A bypass passage 10 which leads from the upstream side to the downstream side of a sluice valve 9 of an outlet vent 8. A sluice valve 11 which is controlled so that it is opened only when the internal-combustion engine is operated at a low speed or under a low load, is provided at the inlet side of the bypass passage 10. An after-burner flame outlet port 14 of the after-burner unit 13 consisting of a fuel pump 12 which is operated only when the sluice valve 11 is opened and an exhaust gas E is introduced into the bypass passage 10, a fresh air sucking blower as indicated by arrow (a), and a combustion apparatus, is opened at an ejector part 15 provided within the bypass passage 10. Flame flowing out of the after burner flame outlet port 14 and exhaust gas E are exhausted and mixed by the ejector part 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust gas treatment device for an internal combustion engine with an exhaust turbine supercharger.

As shown in the side view of Fig. 1 and the front view of Fig. 2, the exhaust gas E discharged from the exhaust port 1 of each cylinder of the internal combustion engine is
The air is introduced into the exhaust turbine supercharger 4 via the exhaust manifold 2, drives the exhaust turbine 3, rotates the compressor 6, which is coaxial with the exhaust turbine 6, and which sucks and pressurizes the intake air A via the intake silencer 5. The intake air A is introduced from the lower compressed air amount into each cylinder of the internal combustion engine via an ink cooler and an intake pipe (not shown), while the exhaust gas E that has driven the exhaust turbine 3 is introduced to the outside via the outlet bend 8 of the exhaust turbine 6. It is released into As mentioned above, conventional internal combustion engines with exhaust turbine superchargers, especially direct injection internal combustion engines, are designed to have higher output than non-supercharged internal combustion engines, so the specifications of the compression ratio and fuel injection system have to be adjusted at low speeds. At low loads, the combustion conditions are less favorable than those of non-supercharged internal combustion engines, and the exhaust turbine supercharger does not exert any supercharging effect.
It produces a large amount of blue-white smoke and a pungent exhaust odor, which is a problem in terms of exhaust pollution.

Therefore, even though an internal combustion engine with an exhaust turbine supercharger can be used as an engine with even higher output, if the specifications are made to support combustion at low speeds or low loads as described above, it is difficult to increase the output. is not obtained.

In other words, when the compression ratio is increased, the maximum pressure in the cylinder increases, so the strength of the crank etc. becomes a problem, and if the nozzle size of the fuel injection valve is made smaller for low-load combustion, the strength of the fuel injection pump at high output will be reduced. becomes a problem.

On the other hand, as in the invention of Japanese Patent Publication No. 52-25486 regarding an exhaust toxicity removal device for an Otto engine and the invention of Utility Model Publication No. 53-25048 regarding an exhaust reburning device for a diesel engine, even in internal combustion engines with an exhaust turbine supercharger, A method is already known in which the exhaust gas is burned at the exhaust turbine outlet of the exhaust turbocharger to remove the harmful components in the exhaust gas. Since the exhaust gas passes through an exhaust reburning device in the region, a catalyst device is required to treat a large amount of exhaust gas at high speeds, and since it is still used constantly, there are problems with the durability of the device.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and is provided in the exhaust turbine supercharger outlet bend only when combustion is poor at low speed or low load in an exhaust turbine supercharged engine. The purpose is to provide the internal combustion engine with the specifications of a high-output engine by closing the gate valve, introducing exhaust gas into the bypass passage, and achieving complete combustion using the afterburner device and catalyst section. It is.

That is, the exhaust gas treatment device of the present invention is provided with a gate valve that closes only when the internal combustion engine is at low speed or under low load, in the outlet bend of the exhaust turbine of the internal combustion engine with an exhaust turbine supercharger, and the gate valve of the outlet bend A bypass passage leading from the upstream side of the valve to the downstream side is provided, and in the bypass passage, a gate valve that opens only at low speed or low load of the internal combustion engine, and an afterburner device and a catalyst section are arranged after the gate valve. It consists of:

The present invention will be described in detail below with reference to the drawings. In the conventional example and each embodiment shown in FIGS. 1 and 2, the same parts are indicated by the same part numbers.

First, in the internal combustion engine equipped with the exhaust turbine supercharger 4 in Embodiment 1 shown in FIG. 3, which has almost the same configuration and function as in FIG.
A gate valve 9 is provided in the outlet pend 8 for discharging the internal combustion engine, and the gate valve 9 is controlled to close only when the internal combustion engine is at low speed or under low load.

A bypass passage 10 is provided that communicates from the upstream side of the gate valve 9 of the outlet vent 8 to the downstream side, and the bypass passage 100 is controlled to open only when the internal combustion engine is running at low speed or under low load. An afterburner device comprising a fuel pump 12 which is provided with a gate valve 11 and is operated only when the gate valve 11 is opened and exhaust gas E is introduced into the bypass passage 10, a blower for sucking fresh air shown by arrow a, a combustor, etc. 1
6, the afterburner flame outlet 14 is connected to the bypass passage 1.
The flame flowing out from the afterburner flame outlet 14 and the exhaust gas E introduced from the outlet bend 8 side are discharged and mixed at the ejector part 15, and the exhaust gas E is mixed with the flame flowing out from the afterburner flame outlet 14. A catalyst installed in the bypass passage 10 increases the temperature of the mixed exhaust gas from 200°C to 300°C with respect to the introduced exhaust gas E having a temperature of about 100°C. After passing through section 16 and being completely oxidized, it is discharged to the outside via outlet bend 8 again.

On the other hand, when the internal combustion engine is at high output, the gate valve 9 is opened,
The gate valve 11 is closed, and the exhaust gas E is discharged to the outside via the outlet pend 8 of the exhaust turbine 6 as usual. in this case,
The gate valve 11 is closed to prevent the exhaust gas E from flowing into the afterburner device 13, and the afterburner device 16, its fuel pump 12, a blower for sucking fresh air, etc. are stopped.

FIG. 4 shows levers 9A and 1 for opening and closing the gate valve 9 of the outlet bend 8 and the gate valve 11 of the bypass passage 10 in FIG.
1A respectively, and these levers 9A and 1
1A is a wire cord 17 as shown in the front view of Fig. 5.
They are each operated by

In Embodiment 2 shown in FIG. 6, the outlet bend 8 is divided into two parts in the middle to facilitate the insertion of the gate valve 9, and the lever 9A of the gate valve 9 and the lever 1 of the gate valve 11 are separated.
1A are connected by a connecting lever 18 as shown in FIG.
It is designed to be controlled remotely using the remote control wire ＼ 19.

Also, the inlet of the bypass passage 10 shown by arrow A on the upstream side of the gate valve 9 of the outlet bend 8 and the outlet bend 8 shown by arrow B.
The return port of the outflow bend 1OA of the bypass passage 10 that communicates with the downstream side of the gate valve 9 is shaped to prevent backflow due to the ejector effect caused by the mainstream of the exhaust gas E in the outlet bend 8.

Next, in the internal combustion engine equipped with the exhaust turbine supercharger 4 according to the third embodiment of the present invention shown in FIG. 4 and subsequent bypass passages 10 are curved onto the outer wall of the cylinder head 20 of the internal combustion engine, and the cylinder head 20 is curved onto the outer wall of the cylinder head 20 of the internal combustion engine without removing the afterburner device 13 etc.
Also, the bonnet 21 can be disassembled.

1.In response to the miniaturization of internal combustion engine models, they are still increasing in size.
The cylinder head 20 is also enlarged and becomes larger on the right side of FIG.
Case length 6 and joint pipe 1 of exhaust bypass passage 10
0B length t! 2 to a predetermined length and replaced.

In addition, in Fig. 8, 23 is the air supply pipe, and 2
4 is the ignition plug of afterburner device 1.

In the third embodiment as described above, the exhaust gas treatment device can be rearranged depending on the total amount of exhaust gas processed by the same internal combustion engine. For example, as shown in FIGS. 9 and 10, The case length 11 of the catalyst section 16 is made the same, only its height is changed, and the case is replaced with the case of the catalyst section 16 of the catalyst section 112, and connected to the mixed gas bend 10C of the bypass passage 10 via a spacer 22. By keeping the width of the catalyst section 160 the same, it is possible to adapt to cases where the same internal combustion engine has a large amount of exhaust gas up to medium speeds. This makes it possible to reduce costs, make it more versatile, and facilitate maintenance and inspection.

Therefore, by applying the present invention, incomplete combustion gas discharged from an internal combustion engine with an exhaust turbine can be completely combusted at low speed or low load, and blue-white smoke and pungent exhaust odor can be eliminated. .

Furthermore, by applying the exhaust gas treatment device of the present invention, there is an advantage that the internal combustion engine is freed from specifications that make combustion good at low speeds or low loads, and can be made into a high output engine.

Note that the present invention can be effectively applied to an internal combustion engine with an exhaust turbine supercharger.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a main part of an exhaust turbine supercharger of a conventional exhaust turbine supercharged internal combustion engine, FIG. 2 is a front view of the main part of FIG. 1, and FIG. Embodiment 1 A side view showing a main part of an exhaust gas treatment device for an internal combustion engine with an exhaust turbine supercharger in Embodiment 1, FIG. 4 is a side sectional view of the outlet bend in FIG. 3, and FIG. 5 is a front view of FIG. 4. 6 is a side sectional view of the outlet bend of the exhaust turbine in Embodiment 2 of the present invention,
7 is a front view taken along the line I-I in FIG. 6, and FIG. 8 is a plan view showing a cross section of a main part of an exhaust gas treatment device for an internal combustion engine equipped with an exhaust turbine supercharger according to Embodiment 3 of the present invention. FIG. 9 is a side view of FIG. 8, and FIG. 10 is a side sectional view showing a state in which the catalyst portion shown in FIG. 9 has been replaced with a catalyst portion having a higher height. 3... Exhaust turbine, 4... Exhaust turbine supercharger,
8... Outlet bend, 9... Gate valve, 10... Bypass passage, 11... Gate valve, 13... Afterburner device, 16... Catalyst section.

Claims (1)

[Claims] A gate valve that closes only at low speed or low load of the internal combustion engine is provided in the outlet bend of an exhaust turbine of an internal combustion engine with an exhaust turbine supercharger, and a bypass passage that communicates from the upstream side of the gate valve of the outlet bend to the downstream side. and an exhaust turbine supercharger, further comprising a gate valve that opens only when the internal combustion engine is running at low speed or under low load, and an afterburner device and a catalyst section disposed after the gate valve. Exhaust gas treatment equipment for internal combustion engines.