JPS59150910A - Power generating system - Google Patents

Abstract

PURPOSE:To save energy by operating a turbine under low load conditions by providing a steam ejector between a boiler and a pressure regulating valve, and connecting an accumulator disposed at a steam outlet of the turbine to said steam ejector. CONSTITUTION:A pressure control valve is attached to a steam supply pipe 13 connecting a boiler 11 and a turbine 12. A valve 16, steam ejector 17 and valve 18 are sequentially attached to a by-pass pipe 15. A steam outlet of an accumulator 24 is connected to the steam ejector 17 through a steam supply pipe 25. When the steam passing through the turbine 12 is excessive for the process, it is branched through a branch pipe 22 to the accumulator for a temporary storage. Thus, operation in response to low loading conditions and a rapid change in loading conditions becomes possible, resulting in saving energy and saving manufacturing processes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power generation system that is particularly effective for small private power generators 7 and equipment.

An example of this type of development system is shown in Figure 1. This system is connected to a boiler I and a turbine 3 connected to a power generation unit 42, and is provided with a pinhole pipe 4 (- pressure reducing valve 5) installed in parallel with the turbine 3. The steam generated in the above is sent to the turbine 3 to perform the ignition 4. On the other hand, when the steam load decreases to 20 to 30 times the rated value, there is no load as shown in Figure 2 C2, and further (2 decreases T) This results in motoring, that is, consumption of electric power.For this reason, when the load is low, the turbine 3, power generation, and rock 2 are stopped, and process steam is supplied via the pressure reducing valve 5.

However, starting and stopping the turbine 3 and the engine 2 require a lot of time and manual operations to avoid problems such as thermal stress deformation. This power generation system is difficult to use when the above-described load fluctuation occurs every day. Therefore, in this case, steam is generally supplied by a low-pressure boiler so that electricity can be saved without purchasing electricity, but this poses a problem in terms of energy savings.

On the other hand, in the case of steam conditions with a toothpick circulation pressure and a large load difference between day and night, as shown in the third factor, a system combining a low pressure boiler 6 and an accumulator 7 shown in FIG. 4 is known as a steam supply system.

In this case, the accumulator is controlled independently using valves 8 and 9t, and the boiler is controlled by manual operation to keep the accumulator internal pressure within a certain range. However, since this system is manually operated, there is a problem in terms of labor saving.

The present invention has been made in view of the above-mentioned circumstances, and aims to provide a train starting system that can drive a turbine even during low load to save energy and labor.

That is, the present invention connects a boiler and a turbine connected to a generator via a pressure control valve, and also connects a bypass pipe in parallel between the boiler and the pressure control valve. and a part of the process steam pipe connected to the steam outlet of the turbine is branched and connected to the steam inlet of the accumulator, and all the steam outlets of the accumulator are connected to the steam generator (:). Go down.

The present invention will be explained below with reference to the embodiment shown in FIG. The illustrated power generation system includes a boiler ZZ and a turbine Z2.
A pressure control valve 14 is attached to the steam supply pipe I3. Between the boiler ZZ and the pressure control valve I4 (second), a bypass pipe I5 is provided in parallel with the steam supply pipe I3, and a valve Z6, a steam ejector 17, and a valve I8 are installed in this order in this bypass vI5.

The turbine I2 is connected to a generator Z9. The steam outlet (2) of the turbine 12 is connected to the process steam pipe 20I, and a valve 2Z is attached to the process steam pipe 20I. /J steam inlet. The steam outlet of the accumulator 24 is connected to the first steam ejector I7 through a steam supply pipe 25 and to the process steam pipe 20 through a steam supply pipe 26. A valve 27 is attached to this steam supply 16% f 26 g-. Also, the valve 1B of the bypass pipe I5 is connected to the process steam pipe 20.

This power generation system detects the internal pressure of the accumulator 24 to automatically control the boiler II, and uses the pressure control valve 14 to constantly control the boiler pressure.

The steam generated in boiler II drives turbine I2,
After the electrical power is generated, it passes through the process steam pipe 20.

If the steam passing through the turbine is greater than the steam required for the process, it is temporarily stored in the accumulator 24 through the branch pipe 225.

On the other hand, if the amount is small, using the steam passing through the bypass pipe 151i,
Steam ejector I2 stored in accumulator 24
The pressure is increased through seven passes, and the pressure is supplied to the turbine I2. This causes the turbine z2 to operate continuously.

The pressure control valve I4 ensures a minimum amount of steam passing through the turbine 12, and also functions to prevent backflow so that the amount of power generated by the starter Z9 does not exceed the amount required by the factory. In this case, a portion of the process steam is passed through the process steam pipe 20 via the valve 18f to compensate for the shortage +C of the process steam.

Note that the present invention is not limited to the above embodiments, but the accumulator 2
4 It is possible to vary the turbine I2 outlet pressure r up to the range of change according to changes in the circular pressure. This makes it possible to meet the plant's needs for steam, electricity (2) and flexible (2)
I can handle two things.

As explained above, by combining an accumulator and a steam ejector, it is possible to cope with low loads and severe load fluctuations using existing equipment, and it is possible to save energy and reduce the amount of labor required. This is particularly effective for small private power generation equipment.

[Brief explanation of the drawing]

Figure 1 shows the LL ratio of the conventional train departure system, Figure 2 shows the characteristic factors showing the relationship between the generator end output and steam load in the same system C, and Figure 3 shows an example of process steam load fluctuation. Figure 4 is an explanatory diagram of the steam supply boiler and accumulator system. FIG. 5 is an explanatory diagram of an emitting system showing an embodiment of the present invention. ZZ...Boiler, I2...Turbine, -13...
Steam supply pipe, I4...pressure control valve, 15...bypass pipe 16.1B, 21.23.21...valve, I7...
・Steam ejector, I9... from "U+'AJ2o..."
Process steam pipe, 22... Branch pipe, 24... Accumulator. 25...Steam supply pipe, company 26...Steam supply pipe. Applicant Sub-Agent Takehiko Shindo Suzue Figure 1 Figure 2 Figure 3 Anger (14)

Claims (1)

[Claims] A turbine connected to a boiler and a firing aircraft is connected via a pressure control valve, and a bypass pipe with a steam ejector kWjt is installed in parallel between the boiler, pressure control valve, and rJJ. 1. Part of the process steam pipe connected to the steam outlet of the turbine was branched off and connected to the steam inlet of the accumulator, and the steam outlet of the accumulator was connected to the steam ejector. power generation system.