JPS6391409A - Heater drain controller of power plant with distilling plant - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention is directed to a turbine power generation plant having a water dispensing device, which is equipped with a heater when the fresh water generating device is operated alone and This invention relates to a heater drain control device for a power generation plant equipped with a fresh water generator.

(Conventional technology) In a power generation plant equipped with a water production device, even when the launching device and equipment are operated independently, they are operated using part of the heater and condenser, which are auxiliary equipment for the turbine. . At this time, if the heater drain level becomes high, the drain will eventually flow to the condenser. On the other hand, when the turbine is stopped, the condenser is out of operation, and it is problematic to flow high temperature drain water to the condenser at such times.

In the following, in a turbine power generation plant having a conventional launching plant device, the operation of the fresh water generator alone will be explained based on FIG. 3.

In FIG. 3, the steam that has done work in the turbine 1 turns into water in the condenser 2, and is converted to water in the first low pressure regulator 6. Second low pressure heater 7
, a third low pressure heater 8 and a deaerator 9, and then a first high pressure heater 10. It is heated by the second high pressure heater 11 and returns to the boiler.

On the other hand, in the water generator 13, water condensed from the extracted air of the turbine 1 is returned to a condensate line between the second low pressure heater 7 and the third low pressure heater 8. When the fresh water generator is operating independently, there is no steam from the turbine 1, and the fresh water generator 13 is operated with steam from a separate system. Condensate from the launching device 13 is led to the high pressure heater 10 through the third low pressure heater 8 and the deaerator 9. The second high-pressure heater 11 heats the condensate from the water generator 13 using steam supplied from the high-pressure bypass valve 12 via the low-temperature reheat line 4, and guides it to the boiler.

(Problems to be Solved by the Invention) At this time, if the high pressure heater 10.11 has a tube leak or the drain level control valve 51, 53, 54, etc. sticks, the condenser side drain control valve 52° 55 to drain the condenser 2 head drain. However, condenser 2
is stopped when the water generator is operating alone, and it is not desirable for condenser 2 to flow high-temperature water to condenser 2 at such times because the condensate pump is also stopped. . As described above, the conventional operation method has problems in terms of turbine plant operation, and also in stopping and repairing the condenser 2.

An object of the present invention is to provide a heater drain control system for a power generation plant equipped with a fresh water generator, which can safely repair the condenser without causing any trouble to the turbine plant even if there is an abnormality in the high pressure heater when the fresh water generator is operating independently. is to provide.

[Structure of the Invention] (Means and Effects for Solving the Problems) The heater drain control device for a power generation plant with a water generator according to the present invention has the following features:
A condensate line in which condensate from the turbine's condenser is heated through a low-pressure heater, a deaerator, and a high-pressure heater and returned to the boiler, and a water generator that returns water condensed from the turbine's bleed air from the low-pressure heater to the condensate line. The present invention is characterized in that the condenser drain line of the high-pressure heater is provided with a high-pressure heater drain stop valve and a heater drain discharge valve that are closed in the event of an abnormality of the heater during independent water generation operation.

In the present invention, when an abnormality occurs in the high-pressure heater during independent operation of the freshwater generator, the high-pressure heater drain stop valve closes.
Since the heater drain discharge valve listens, it prevents high-temperature drain from flowing into the condenser, allowing safe plant operation and repair of the condenser.

(Example) The present invention will be described below with reference to an example shown in FIG. In FIG. 1, the same reference numerals as in FIG. 3 indicate the same parts, so the explanation thereof will be omitted. In FIG. 1 showing a turbine generator plant with a freshwater generator according to the present invention, the present invention has a first valve on the downstream side of the condenser side drain control valves 52 and 55.
A high pressure heater drain valve 56 and a second high pressure heater drain stop valve 57 are provided, and the drain control valve 52 and the drain stop valve 56 are provided.
This is characterized in that a heater drain discharge valve 50 is provided between the two.

Next, the operation of the heater drain control device of the power generation plant with freshwater generation device of the present invention configured as described above is illustrated in FIGS. 1 and 2.
This will be explained with reference to the figures. First, in FIG. 1, when the freshwater generator 13 is operating independently, the drain level of the heaters 10 and 11 is at a high level, and the heater drain is connected to the regulating valves 54 and 51.
If the condenser cannot be drained, the drain valve 5 on the condenser side is automatically opened.
2 and 55.

Therefore, at this time, in order to prevent high-temperature sinful drain from flowing into the condenser side, high-pressure heater drain stop valves 56 and 5
7 to prevent heater drain from flowing into the condenser 2. If the heater causes a tube leak or the drain adjustment valve 51, 53, 54 sticks, etc., the heater drain level will become abnormally high, which is unfavorable from the operational point of view of the turbine plant and the fresh water generator 13. It is necessary to temporarily drain the drain. At this time, the heater drain discharge valve 50 is opened to discharge the drain to the outside of the system. ′［
[Effects of the Invention] As described above, according to the present invention, even if there is an abnormality in the heater or the like when the bookbinding device is operating alone, both the turbine plant and the launching device can be operated safely, and the condenser can be repaired.

[Brief explanation of the drawing]

FIG. 1 is a block system diagram showing an embodiment of a heater drain control device for a power generation plant with a bookbinding device according to the present invention;
The figure is a block diagram of its operation, and FIG. 3 is a block system diagram of a heater drain control device for a conventional power generation plant with a launching device. DESCRIPTION OF SYMBOLS 1... Turbine 2... Condenser 6... First low pressure heater 7... Second low pressure heater 8... Third low pressure heater 9... Deaerator 10... First High pressure heater 11...Second high pressure heater 51, 52...First high pressure heater drain level control valve 5
3, 54.55...Second high pressure heater drain level control valve 56...First high pressure heater drain stop valve 57...Second high pressure heater drain stop valve 50...Heater drain discharge valve (8733) Agent Patent attorney Inomata Yoshiaki (baka)
1 person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) A condensate line in which condensate from the turbine's condenser is heated through a low-pressure heater, a deaerator, and a high-pressure heater and returned to the boiler, and water condensed from the turbine's bleed air is returned from the low-pressure heater to the condensate line. A fresh water generator, characterized in that the condenser drain line of the high pressure heater is provided with a high pressure heater drain stop valve that closes and a heater drain discharge valve that opens when the heater is abnormal during fresh water generation alone operation. Heater drain control device for power generation plants.