JPS6056111A - Power generating unit - Google Patents

Abstract

PURPOSE:To avoid the use of the commercial power supply so as to enhance profitability by providing a steam turbine and an internal combustion engine at each end of the rotary shaft of the A.C. power generator and further by, after actuating the plant by the internal combustion engine, switching the load to the steam turbine. CONSTITUTION:A double-end shaft type power generator is employed in a plant. A steam turbine 3 and a gas turbine 5 is connected mechanically to the right and left sides of the shaft via electrode clutches 6, 7 respectively. Initially, the clutch 6 is disconnected while the clutch 7 is connected so that the power generator is driven by the gas turbine 5. When the steam is generated after a predetermined period of time, the steam turbine is started and when its revolution is increased, clutch 6 is connected. Then after the governors of both turbines are adjusted, the load is transferred from the gas turbine 5 to the steam turbine 3, so that finally, the gas turbine is unloaded while all the load is placed on the steam turbine. According to this construction, the commercial power supply does not need to be used and consequently, fuel cost is reduced.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a power generation device that is not parallel to a commercial power source.

[Technical background of the invention and its problems] In general, chemical plants, waste incineration plants, etc. often use by-product steam to generate electricity, and for this reason, turbine generators are installed in the plants. Electricity is supplied from the generator to the power required within the factory, but in cases such as garbage incineration plants where auxiliary combustion work is required before the generator can begin regular operation, a commercial power source is inevitably required. The commercial power source and generator are operated in parallel. When the generator enters steady operation and the amount of power it generates becomes larger than the required amount of power consumed within the factory, the surplus power is sent back to the commercial power source.

However, as the energy situation has recently changed, the growth in power demand from power companies has slowed down and the capacity utilization rate has decreased, power companies are increasingly refusing to allow parallel operation with in-house power generation equipment. Even if parallel operation is permitted, the price of reverse transmission power, that is, charging power, tends to be kept low.

For this reason, local governments, etc., install power generation equipment that is lower than the power generation capacity to generate electricity that is commensurate with the power consumed within the factory, on the grounds that selling electricity is not worth the price of the power generation equipment. There seems to be a trend towards power systems that are unrelated to commercial power sources. However, in this case, since the power generation equipment is not in operation at the time the plant is started up, it is necessary to secure power by some means.

FIG. 1 shows a conceptual diagram of a conventional power supply system. That is, the generator 2 driven by the steam turbine 3 is operated in parallel with the commercial power source 1 and supplies power to the load 4.

At the beginning of the plant start-up, the load 4 is supplied with power from the commercial power source 1 and the plant enters process operation, but when steam is generated as a result, the turbine generators 2 and 3 enter the operating state, and the load 4 is supplied from the generator 2 to the load 4. At the same time, surplus power is transmitted to the commercial power source 1.

[Object of the Invention] The present invention does not perform any parallel operation with a commercial power source, starts up the plant with another power source, and when the amount of steam necessary for power generation is secured, the power generation device smoothly switches to a steam turbine. The purpose is to obtain.

[Summary of the Invention] The present invention comprises a gas turbine, a reciprocating engine, a steam turbine, and at least one generator directly connected to these prime movers. This is a power generation device that is characterized by the fact that it automatically drives the generator using a steam turbine after the process starts up, and supplies power to the plant without running it in parallel with a commercial power source.

[Embodiments of the invention]

Next, an embodiment of the present invention is shown in FIG. i.e. generator 2
The steam turbine 3 and the gas turbine 5 are mechanically connected via electromagnetic clutches 6.7 on the left and right sides, respectively. In this case, an appropriate speed reducer is provided to equalize the rotation speeds of the output shafts of the steam turbine 3 and the gas turbine 5. Initially, the clutch 6 is disengaged and the clutch 7 is closed, and the gas turbine 5 drives the generator 2. The power generated by the generator 2 is supplied to the load 4, but since the amount of load is small at the beginning of the plant start-up, the gas turbine 5 is automatically controlled to an output commensurate with the load 4. When steam is generated after a period of time has elapsed, the steam turbine 3
starts. When the rotational speed of the steam turbine 3 increases sufficiently and the relative speed of the clutch 6 approaches zero, a detector (not shown) detects this and closes the clutch 6. At this point, the generator 2 is driven by both the steam turbine 3 and the gas turbine 5, but as shown in FIG. Since the regulation rate curve of the steam turbine 3 is at the position Wt, 3a, the steam turbine 3 is in a no-load state. Then, by adjusting the governors (not shown) on both sides, the load is transferred from the gas turbine 5 to the steam turbine 3, and finally the fourth
As shown in the figure, by setting the adjustment ratios on both sides to curves 3b and 5b, the gas turbine 5 becomes unloaded and the steam turbine 3 becomes fully loaded. Since the relative speed on both sides of the clutch 7 is zero and there is no load, this clutch 7
Even if you open it, no big impact will occur. Power is supplied to the load 4 from the generator 2 without interruption.

Once the plant is started up and the generator 2 is driven by the steam turbine, it will be in continuous operation on a monthly basis from then on, so there will be no need for fuel costs for power generation. Furthermore, in order to increase the reliability of the power generation equipment, it is also possible to provide a plurality of power generation devices as shown in FIG. In this case, it is necessary to synchronize each generator.

Further, as another embodiment of the present invention, a reciprocating engine such as a gas engine or a diesel engine can be used instead of the gas turbine as shown in FIG. That is, in FIG. 4, generator 8 is directly connected to engine 9, and generators 2 and 8 are connected directly to engine 9.
Supplies power to the load from

Generator 8 has a lower rotation speed than generator 2, so it is separate.
If the output rotation speed of the steam engine 9 can be made equal to the rotation speed of the steam turbine 30, the configuration as shown in FIG. 2 will of course be obtained. The operation is the same as in the previous embodiment, in which the engine 9 initially drives the generator 8 to supply power to the load 4. When the plant starts up and steam is generated, the steam turbine 3 is started and drives the generator 2. The generator 2 is synchronized by a synchronization device (not shown) in order to operate in parallel with the generator 8. Immediately after synchronization, the generator 2 is under no load, as in FIG. 3 of the above-described embodiment, but the load is transferred from the generator 8 to the generator 2 under the control of a governor (not shown). When the generator 8 becomes unloaded, the load 4 is supplied from the generator 2, and the engine 9 is stopped.

〔Effect of the invention〕

According to the present invention, there is no need for receiving power from a commercial power source or a device for parallel operation with a commercial power source, and there is no need to pay any basic charges for receiving power from a commercial power source. By only using heavy oil or LNG,
Thereafter, there is no need for fuel costs, so an economical power generation device for a waste incineration plant can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional power generation device, FIG. 2 is a block diagram showing an embodiment of the power generation device of the present invention, FIGS. 3 and 4 are explanatory diagrams of characteristics of FIG. 2, and FIG. It is a block diagram which shows another Example of this invention. 2...Aircraft 11E 3...Steam turbine 5...
Gas turbine 6, 7...Clutch 8...Generator
9.1. Engine agent patent attorney Kensuke Chika (and 1 other person) 1st I!
1 Figure 2 Figure B Figure 4 ≦ Figure B

Claims (1)

[Claims] A power generation device comprising a generator that generates alternating current power, a steam turbine connected to one rotating end of the generator, and an internal combustion engine connected to the other end of the rotating shaft of the generator.