JPS5820908A - Electric power plant - Google Patents

Abstract

PURPOSE:To reduce fuel consumption of a boiler and to improve power generation efficiency drastically, by a method wherein a vapor reservoir is provided between a reheater outlet and a feed-water heater, and extraction steam quantity is reduced. CONSTITUTION:A low pressure feed-water heater 8 is connected through a gate valve 24 and piping 25 with an outlet edge of a vapor reservoir 18 which reserves vapor passing through a reheater 14. At the time of start of power generation the vapor which comes out of a boiler 1 and passes through a high pressure turbine bypass piping 13, the reheater 14, a desuperheater 21 is reserved in the vapor reservoir 18. At the time of a rating operation the vapor reserved in the vapor reservoir 18 is recovered in the low pressure feed-water heater 8. In this manner, vapor energy at the time of either start of the power generation or load interruption can be recovered, generated vapor quantity by the boiler is reduced, fuel consumption of the boiler can be reduced drastically and power generation efficiency can be improved drastically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power generation plan, and more particularly to a power generation plant equipped with a steam storage device.

FIG. 1 shows an embodiment of a conventional power generation plant, and reference numeral 1 indicates a boiler.

The steam generated in the boiler 1 passes through the pipe 2 and is introduced into the high-pressure turbine 6, and after passing through the intermediate-pressure turbine 4 and the low-pressure turbine 6 and driving the generator 5a, it is condensed in the condenser 6 installed in the low-pressure turbine 5. It is considered water.

This condensate is sucked by a pump 7, passes through three low-pressure feed water heaters 8 arranged in series, and then passes through a deaerator 9.
The gas components in the condensate are removed.

The condensate from which the gas components have been removed is sucked by the pump 10, passes through three high-pressure feed water heaters 11 arranged in series in sequence, is heated to a high temperature, and is then diverted to the boiler 1t.

In the power generation plant configured as described above, at the time of start-up or load interruption, the steam generated in the boiler 1 is transferred to the high-pressure turbine bypass pipe 1 which branches from the pipe 2 and has an on-off valve 12 inserted therein. Through the ink, boiler 1
After passing through the used reheater 14, the water passes through a low-pressure turbine bypass pipe 16 in which an on-off valve 15 is inserted, and is recovered to the condenser 6.

Therefore, in the power generation equipment configured as described above, the steam energy generated in the boiler 1 is absorbed into the condenser 6 when the plant is started up or when the load is cut off, making it possible to effectively utilize thermal energy. It could not necessarily be said that they were being used for this purpose.

The present invention has been made in response to such conventional circumstances, and includes a steam turbine driven by steam ζ2 from a boiler, a generator driven by the steam turbine, and steam condensate that has passed through the steam turbine. a feed water heater that heats the condensate; a turbine bypass device that temporarily guides the steam generated in the boiler to a reheater provided in the boiler; The present invention provides a power generation plant characterized by comprising a steam storage device for storing steam, and piping connecting the steam storage device and the high temperature side of the feed water heater.

The details of the present invention will be described below with reference to an embodiment shown in FIG.

Note that in FIG. 2, parts common to those in FIG. 1 are given the same reference numerals.

In the power plant shown in FIG. 2, a branch pipe 19 branches from a pipe 17 connecting the outlet of the reheater 14 provided in the boiler 1 and the intermediate pressure turbine 4 and is connected to the steam storage device 18.
is connected.

The branch pipe 19 includes an on-off valve 20 and a desuperheater 2 in order from upstream.
1 is inserted, and the desuperheater 21ζ is the steam storage device 1.
8 is connected to a pipe 23 via a pump 22.

A pipe 25 in which an on-off valve 24 connected to the high temperature side of the low pressure feed water heater 8 is inserted is connected to the outlet end of the steam storage device 18 . - In the power generation plant configured as described above, for example, at the time of plant startup, the high-pressure turbine pump is not vented to the turbine 5.4.5 until the main steam pressure equivalent to 30% load is generated at the turbine load.
1. The boiler 1 is fired by using the 1!1 bus piping.

In this case, the steam discharged from the boiler 1 passes through the high-pressure turbine bypass pipe 13, passes through the reheater 14 of the boiler 1, passes through the on-off valve 20, the desuperheater 21, and then passes through the steam storage device 1.
8ζ2 is stored.

By passing through the reheater 14, the steam temperature is 500°C or more. Therefore, if the reheating pressure is set to 12 atm in the desuperheater 21, the steam will have a temperature of 150 to 2 G (l). The temperature is reduced, and a decrease in strength of the material of the steam storage device 1B is prevented.

In addition, the spray water is stored in the steam storage device 18 in the desuperheater 21.
is supplied by a pump 22 from

After such operation continues for 2 to 3 hours, the on-off valves 12 and 20 provided in the high-pressure turbine bypass piping and the steam storage device 18 are closed, and the steam is transferred to the turbine 6.
．． 4.5, and transition to rated operation of 100 heavy loads is performed.

After entering the rated operation, the on-off valve 24 provided in the pipe 25 connected to the low-pressure feedwater heater 8 is opened, and the steam stored in the steam storage device 18 is recovered to the turbine wheel. In this case, since the steam storage device 18 stores steam as saturated water due to its internal pressure, the steam is generated by self-evaporation due to the reduced pressure of the steam storage bag [18].

Therefore, a certain level of pressure difference is required between the steam storage device 18 and the low-pressure feed water heater 8 for steam recovery light.

As shown in FIG. 3, in the power generation branch F configured as described above, the generated steam amount Gl,t- is recovered from the steam storage device 18 to the low-pressure feed water heater 8, thereby increasing the amount of air extracted from the turbine that is originally required. G2 can be reduced by the amount of generated steam G1.

Therefore, the amount of steam at the turbine inlet, that is, the amount of fuel consumed by the reboiler, where the amount of steam generated by the boiler is small, can be greatly reduced, and the efficiency can be greatly improved.

In addition, the steam storage device 18 is connected to the low pressure turbine bypass piping 1
6, this low pressure turbine bypass piping 16 can be removed.

As described above, according to the power generation plant of the present invention, it is possible to effectively utilize steam that has not been utilized in the past, and as a result, efficiency can be greatly increased.

[Brief explanation of the drawing]

Figure 1 is a piping diagram showing an example of a conventional power generation plant;
FIG. 2 is a piping diagram showing an embodiment of the power generation plant of the present invention;
FIG. 6 is an explanatory diagram for explaining that the amount of extracted air from the turbine decreases. 1...Poiwo 3...High pressure turbine 4...Intermediate pressure turbine 5...Low pressure turbine 6...Condenser 8... ...Low-pressure feed water heater 11 ...... High-pressure feed water heater 18 ...... Steam storage device 21 ...... Desuperheater (7317) Representative Patent Attorney Noriyuki Chika ( (and 1 other person) Figure 1 Figure 2 Deco Figure 3

Claims (1)

[Scope of Claims] t A steam turbine driven by steam 42 from a boiler, a generator driven by this steam turbine, a condenser that condenses the steam that has passed through the steam turbine, and this condenser. A feed water heater that heats water, a steam storage device that temporarily guides the steam generated in the boiler to a reheater installed in the boiler (a turbine bypass device, and a steam storage device that stores the steam that has passed through the reheater) and piping connecting the steam storage device and the high temperature of the feed water heater. 2. A power generation plant comprising: a pipe connecting the steam storage device and the high temperature of the feedwater heater. 2. Between the reheater and the steam storage device, there is a The power generation plunger according to claim 1, wherein an on-off valve and a desuperheater are inserted in this order.