JPS60135617A - 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 synchronous generator driven through a reduction gear by a recovery turbine, which is driven by the exhaust gas of the supercharger of an internal-combustion engine, is converted from AC to DC and then from DC to AC again and 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 synchronous generator 12 driven through a reduction gear 11 by the turbine 10 is converted from AC to DC by a converter 13 and, after that, converted from DC to AC having the same frequency as that of the main generator in order to be superposed upon the output of the main generator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes exhaust gas energy from an internal combustion engine in an internal combustion engine drive power generation system that uses exhaust gas from the internal combustion engine to rotate a turbocharger to increase the output of the internal combustion engine. This invention relates to a turbocharger exhaust gas energy recovery power generation system that recovers and generates power from the resulting surplus energy to increase the output of the generator.

Generally, in this type of internal combustion engine-driven power generation device, internal combustion +
SN exhaust gas rotates the turbocharger and internal combustion ff
Increasing the IN output has been widely practiced in the past, but the exhaust gas after passing through the turbocharger is still high temperature and high pressure, and releases a considerable amount of surplus energy.

Despite this, the current situation is that it is being wasted and emitted outside the aircraft through the muffler. Therefore, the thermal efficiency of the internal combustion engine remains in the 40% range due to this waste gas and the ineffective release of thermal energy after cooling the internal combustion engine. Various attempts have been made to recover this ineffective emitted energy using exhaust heat recovery boilers, etc., but all of these have poor cost performance and are currently slow to make progress.

Internal combustion engines that reuse exhaust gas from turbochargers have been known for a long time in theory, but it has been difficult to put them into practical use, but recently the exhaust gas has been used to rotate a recovery turbine.
Turbo compound diesel engines, which attempt to increase output by transmitting the rotational power to the engine's crankshaft via a fluid coupling, have reached the stage of practical use.

However, with this method, the efficiency of the fluid coupling is low;
The disadvantages are that the recovered power is wasted and that it requires a large modification of the internal combustion engine 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,
Instead of relying on the conventional 1fAhi power synthesis method, the exhaust gas energy of the turbocharger is recovered, reused, and efficiently converted into electrical energy. A turbocharger exhaust gas energy recovery power generation system that is designed to increase the overall output by superimposing 11 on the output side of the directly connected main generator, thereby improving the overall energy efficiency of the internal combustion engine-driven power generator. We aim to provide the following.

In order to achieve such an object, the present invention provides an internal combustion engine-driven power generation system in which a recovery turbine is rotated by the exhaust gas of a turbocharger, and the shaft power is used to drive an auxiliary AC synchronous generator via a reduction gear to generate an AC generator. It is characterized by converting electric power into DC using a converter, and further converting it into AC having the same frequency as the main generator using an inverter, thereby superimposing it on the output side of the main generator, thereby increasing the number of main generators.

Furthermore, the present invention converts the DC WE power generated by driving the auxiliary DC generator through the reduction gear 1 into AC power using an inverter, and superimposes it on the output side of the main generator to recover exhaust gas energy and generate main power generation. It is characterized by increasing machine output.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram in which the exhaust gas energy recovery power generation device according to the present invention is incorporated into an internal combustion engine-driven power generation device.
2 is an internal combustion engine, and 2 is a power generator (hereinafter referred to as the main generator) which is driven by the internal combustion engine l and generates the main electric power.

3 is a turbocharger, 4 is an intake pipe of an internal combustion engine, 5
, 6゜7 is an exhaust pipe, 8 is a muff 2-19 is an external exhaust pipe, 1
0 is a recovery turbine, 11 is a recovery turbine 1 that rotates at high speed
12 is an auxiliary current transformation rotation generator 'RL machine directly connected to the auxiliary AC synchronous generator 11, and 13 is a converter that converts the AC output of this auxiliary AC synchronous generator 12 into DC. An inverter converts the DC output of the converter 13 into AC again, 15 is an AC output cable of the inverter 14, and 16 is an output cable of the main light N unit 2.

In FIG. 1, the operation of the turbocharger 3 is well known and will not be described here. However, the exhaust gas from the turbocharger 3 is directed to the recovery turbine 10 through the exhaust pipe 6, and the recovery turbine 10 is rotated at high speed again. After the interest energy is recovered, it passes through the exhaust pipe 7, is muffled by the muff 2-8, and is discharged into the atmosphere through the external exhaust pipe 9. This recovery turbine 10 rotates at a high speed, and the exhaust gas jIt of the internal combustion 4R' generator 1 inevitably changes as the load on the main generator 2 changes, so the rotational speed of the recovery turbine 10 also changes. The shaft output of the recovery turbine 10 is reduced by the rock 11 to the speed of the auxiliary AC synchronous generator 12, and the auxiliary AC synchronous generator 12 is driven. As mentioned above, the recovery turbine 1
0 changes with the load fluctuation of the main light 11L generator 2, so the frequency generated by the auxiliary AC synchronous generator 12 also inevitably changes, so it cannot be connected to the output side of the main generator 2 as it is. For this purpose, the converter 13 converts the output of the auxiliary AC synchronous generator 12 into DC, and then the imperter 14 converts it into AC with the same frequency as the main generator 2. It is designed to be superimposed on the output side of N machine 2. The frequency of this inverter 14 is controlled to follow the frequency of the main generator 20, and by controlling the excitation of the auxiliary AC synchronous generator 14, the output of the main generator 2 is increased by the recovered power.

FIG. 2 is a block diagram showing another embodiment according to the present invention, in which the same reference numerals as in FIG. 1 indicate the same parts, and redundant explanation will be omitted here.

17 is an auxiliary DC generator directly connected to the reducer 11; 18 is a DC power cable of the auxiliary DC generator 17; 19 is an inverter that converts the DC output of the auxiliary DC generator 17 into AC;
20 is an AC output cable of the inverter 19. In FIG. 2, the shaft output of the recovery turbine 10 is
The speed is stepped down to the speed of the auxiliary DC generator 17, and the auxiliary DC generator $1fi17 is driven. Converting the DC power generated by the auxiliary DC generator 17 into AC power of the inverter 19 and superimposing it on the output side of the main generator 2 4
From this, the main generator 2 is used for the amount of electricity recovered from the exhaust gas energy.
output 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 system according to the present invention may be installed separately, but if it is mounted above the main generator, the installation space will not be increased and the output of the internal combustion engine driven power generation system can be increased. It is possible.

In addition, 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 variations are possible.

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

[Brief explanation of drawings]

FIG. 1 is a block diagram in which an exhaust gas energy recovery power generation device according to the present invention is incorporated into an internal combustion engine drive system, and FIG. 2 is a block diagram showing another embodiment of the present invention. l... Internal combustion engine, 2... Alternating current generator (
Main power generation i), 3...Turbocharger, 8.
...Muffler, 10...Recovery turbine%
11... Speed reducer, 12... Auxiliary AC synchronous generator, 13... Converter, 14.19.
...Inverter, 17...Auxiliary 11th flow generator. Patent applicant Toyo Denki Manufacturing Co., Ltd. Representative Doi Atsuge 1st figure? 1,000 M, Amendment (spontaneous) J/D, 1985 Commissioner of the Patent Office, 1, Indication of the case, Patent Application No. 242851, 1982, 2, Title of the invention: Turbocharger exhaust gas energy recovery power generation system 3,
Relationship with the person making the amendment 41 cases Patent applicant postal code 104 No. 2, Yaesu 2-7, Chuo-ku, Tokyo J Specifications, “Detailed Description of the Invention,” No. 1-35, Contents of the Amendment (1) ) Mingha 11th! 1, page 4, line 18, [let the main generator...] be corrected to "let the main generator output...". (2) On page M5, lines 13 to 14, "recovery turbine 10 output" is corrected to "recovery turbine 10 output". (3) "Auxiliary AC synchronous generator 14J" in lines 3 to 4 on page 7 is corrected to "auxiliary AC synchronous generator 12J." (4) AC Cζ in r19 on page 7, line 17. Correct ``...'' to ``AC lζ...J in 19.〇(5) Same page 7, line 20, ``Like this...'' is changed to ``Like this...'' ...” is corrected.

Claims (1)

[Scope of Claims] 1. In an internal combustion engine-driven power generation device that uses exhaust gas from an internal combustion engine to rotate a turbocharger to increase output of the internal combustion engine, the exhaust gas from the turbocharger rotates a recovery turbine; The power of the motor drives an auxiliary AC synchronous generator via a speed reducer, converts the AC power generated by the AC synchronous generator into DC using a converter, and converts the AC power to DC at the same frequency as the main generator using an inverter. A turbocharger exhaust gas energy recovery power generation system characterized in that the turbocharger exhaust gas energy recovery power generation system is superimposed on the output side of the main generator to increase the output of the main generator. 2. In an internal combustion engine-driven power generator device that uses exhaust gas from an internal combustion engine to rotate a turbocharger to increase the output of the internal combustion engine, the exhaust gas from the turbocharger rotates a recovery turbine, and the shaft power of the recovery turbine decelerates the engine. An auxiliary DC generator is driven through the generator, and the DC power/power generated by the DC generator is converted into AC by an inverter, and the energy is recovered from the exhaust gas by rising to the output side of the main generator. A 1L turbocharger exhaust gas energy recovery system characterized by increasing generator output.