JPS60135616A - Power generating system by recovering exhaust gas energy of turbocharger - Google Patents

Abstract

PURPOSE:To contrive to improve the overall efficiency by a method wherein the output of an auxiliary generator driven through a variable speed reduction gear by a recovery turbine, which is driven by the exhaust gas of the turbocharger of an internal combustion engine for driving generator, is superposed upon the output of a main generator. CONSTITUTION:A main generator 2 is driven by an internal combustion engine 1 equipped with a turbocharger 3, the exhaust gas 6 of which drives a recovery turbine 10 at the same time. The output of an auxiliary induction generator 12 driven through a variable speed reduction gear 11 by the turbine 10 is superposed upon the output of the main generator 2. The variable speed reduction gear 11 is automatically controlled so as to bring the rotating speed of the auxiliary generator 12 within the rated speed by inputting the signal of a speed detector 13 installed on the generator 12 to a control unit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an internal combustion engine-driven power generation device that uses exhaust gas from the internal combustion engine to rotate a turbocharger to increase the output of the internal combustion engine. This relates to a turbocharger exhaust gas energy recovery power generation system that generates electricity and increases the output of the power generator.

In general, in engine-driven power generators, it has been widely used to increase the output of the internal combustion engine by rotating the turbocharger with the exhaust gas from the internal combustion engine, but the exhaust gas after passing through the turbocharger is still at a high temperature. Despite having a considerable amount of surplus energy at high pressure, the current situation is that it is wastefully released outside the aircraft through the muffler.

Therefore, due to this waste gas and the wasteful release of heat energy after cooling the internal combustion engine, the thermal efficiency of the internal combustion engine remains in the 40s.Various attempts have been made to recover this wasteful release energy using waste heat recovery boilers, etc. However, both have poor cost performance and are currently slow to make progress.

Internal combustion engines that reuse exhaust gas from turbochargers have been theoretically known for a long time, but it has been difficult to put them into practical use. Turbo compound diesel engines, which attempt to increase output by transmitting power to the engine's crankshaft via a joint, have reached the stage of practical use.

However, with this method, the efficiency of the fluid coupling is low;
This has the disadvantage that the recovered power is wasted and that extensive modification of the internal combustion engine is required to incorporate a mechanism for transmitting the power of the fluid coupling to the crankshaft.

The present invention has been made focusing on the above-mentioned points,
By recovering and reusing the exhaust gas energy of the turbocharger and efficiently converting it into electrical energy, without relying on conventional mechanical power synthesis methods, conventional internal combustion engines can be used without any modification. Electrically superimposes on the output side of the main generator directly connected to the main generator to increase the total output,
It is an object of the present invention to provide a turbocharger exhaust gas energy recovery power generation system designed to improve the overall energy efficiency of an internal combustion engine-driven power generation device.

In order to achieve such an object, the present invention provides an internal combustion engine-driven power generation system in which exhaust gas from a turbocharger is used to rotate a recovery turbine, and this shaft power is used to drive an auxiliary induction generator via a variable speed reducer. By automatically controlling the speed of the variable speed reducer so that the output of the generator is within the rated value and compatible with the recovered power, the power generated from the auxiliary induction generator is superimposed on the output side of the main generator. It is characterized by increasing the generator output.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG.
2 is an internal combustion engine, and 2 is an alternating current generator (hereinafter referred to as the main generator) that is driven by the internal combustion engine 1 and generates the main electric power.

3 is a turbocharger, 4 is an intake pipe of internal combustion engine 1, 5 is
, 6.7 is an exhaust pipe, 8 is a muffler, 9 is an external exhaust pipe, 1
0 is a recovery turbine, 11 is a variable speed reducer that reduces and changes the speed of the output of the recovery turbine 10, 12 is an auxiliary induction generator directly connected to the variable speed reducer 11, and 13 is the shaft end of the auxiliary induction generator 12. A directly connected speed detection generator 14 is a control unit that controls the speed of the variable speed reducer 11, and inputs the output of the speed detection generator 13.

15 is the output cable of the auxiliary induction generator 12, and 16 is the output cable of the main generator 2! It is a pull. FIG. 2 is a block diagram showing another embodiment of the means input to the control unit 14 in FIG. 1, and 17 is a power flow detector provided on the output side of the auxiliary induction generator 12. , and the same as in FIG. 1 except that the output thereof is input to the control unit 14. □ In FIG. 2, the same parts as in FIG. 1 are omitted.

In FIGS. 1 and 2, the operation of the turbocharger 3 is well known and will not be described here, but the exhaust gas from the turbocharger 3 is guided to the recovery turbine 10 through the exhaust pipe 6, and the exhaust gas from the turbocharger 3 is guided to the recovery turbine 10 again. After the surplus energy is recovered by rotating at a high speed, the sound is muffled by a muffler 8 through an exhaust pipe 7, and then released into the atmosphere through an external exhaust pipe 9. This recovery turbine 10 rotates at high speed, and the main generator 2
Since the amount of exhaust gas from the internal combustion engine 1 inevitably changes as the load changes, the rotational speed of the recovery turbine 10 also changes.

Therefore, the speed is stepped down via the variable speed reducer 11 to drive the auxiliary induction generator 12. The variable speed reducer 11 is a speed reducer that can be electrically controlled and automatically controlled, such as a combination of a gear reducer in the front stage and an eddy current coupling in the rear stage.

As an input to the control 14 that controls the speed of the variable speed reducer 11, as shown in FIGS. 1 and 2, the auxiliary induction generator 12
The output of the speed detection generator 13 attached to the shaft end of the auxiliary induction generator 12 or the output of the power flow detector 17 provided on the output side of the auxiliary induction generator 12 is input. Connect the output cable 15Ci of the auxiliary induction generator 12 to the output cable 16 of the main generator 2.

As mentioned above, the rotational speed of the recovery turbine 10 varies according to the load fluctuation of the main generator 2, so the auxiliary induction power generation MA12
The variable speed reducer 11 is automatically controlled based on the command from the control section 14 so that the rotational speed of the variable speed reducer 11 is within the rated speed. That is, the speed detection generator 13, the control unit 14, and the variable speed reducer 11 perform slip control of the auxiliary induction generator 12, and the power flow detector 17, the control unit 14, and the variable speed reducer 11 perform slip control of the auxiliary induction generator 12. Performs power flow control.

The auxiliary induction generator 12 receives the excitation current from the output cable 16 of the main generator 2 and sends the energy recovered generated power from the recovery turbine 10 to the variable speed reducer 11 to the auxiliary induction generator 12 to the output cable 16. As a result, the recovered power is superimposed on the main generated power of the main generator 2,
Generated power is increased.

As described above, the method of the present invention recovers energy electrically, rather than using the conventional mechanical power synthesis method.

Since it is a synthetic device, control and various protections are easy because it is an electrical system, and it is possible to increase efficiency.

The exhaust gas energy recovery power generation device according to the present invention may be installed separately, but if it is mounted on top of the main generator, the output of the internal combustion engine-driven power generation device can be increased without increasing installation space. 〇Also, when installing a new internal combustion engine-driven power generation device, it is possible to incorporate the exhaust gas energy recovery power generation device according to the present invention, and if it is an existing internal combustion engine-driven power generation device, the output can be further increased by adding these. Various pariage signs are possible, such as:

As explained above, according to the present invention, the power generation output of the internal combustion engine-driven power generator is increased by the amount of power generated by the recovery turbine-driven auxiliary power generator, without changing the ratings and structures of the internal combustion engine and the main generator. is increased, improving overall energy efficiency〇

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an internal combustion engine-driven power generation device incorporating the τ exhaust gas energy recovery power generation device according to the present invention;
FIG. 2 is a block diagram of main parts showing another embodiment of the means for inputting to the control section of FIG. 1. l...Internal combustion engine, 2...AC light? lt
Machine (main generator), 3...Turbocharger, 8
...Muffler, 10 ...Recovery turbine, 1
1...Variable speed reducer, 12...Auxiliary induction generator, 13...Speed detection generator, 14...
Control unit, 15.16...Output cable, 17.
...Power flow detector. Hair 1 Figure 2 Figure 7i Hand Pillow Correction Book (Spontaneous) 1981! January 7th, Commissioner of the Japan Patent Office, 1, Indication of the case, Patent Application No. 242850, filed in 1982. Title of the invention: Turbocharger exhaust gas energy recovery power generation system 3.
Relationship with the case of the person making the amendment Patent applicant postal code 104 No. 2, 2-7 Yaesu, Chuo-ku, Tokyo Column 5 of “Detailed explanation of the invention” in the old specification, Contents of the amendment (1) Page 4 of the specification In the 18th line, "recovery turbine io output" is corrected to "output of recovery turbine 10". (2) Page 6, line 7, “control 14J is
Correct to.

Claims (1)

[Claims] In an internal combustion engine-driven power generation device that rotates a turbocharger using the exhaust gas of the internal combustion engine to increase the output of the internal combustion engine, the generator is equipped with a recovery turbine that rotates using the exhaust gas of the turbocharger, and is powered by the shaft power of the recovery turbine. generated by the induction generator by driving an auxiliary trace induction generator via a variable speed reducer and controlling the speed of the variable speed reducer so that the output of the induction generator is within the rated value and is compatible with the recovered power. The generated power is superimposed on the main generator output side,
A turbocharger exhaust gas energy recovery power generation system characterized by being written to increase the output of the main generator.