JPH07158811A - Iron removing device - Google Patents

Abstract

PURPOSE:To provide an iron removing device installed in a deaeration device placed in a water feeding facility in a power generating plant such as a heat power plant and a nuclear power plant and the like so as to remove iron contained in condensate. CONSTITUTION:Condensate 7 obtained from a steam turbine enters a water storing tank 8-2 through a deaeration tank 8-1 and stored as water 17. A partition plate 14 as well as an electromagnetic filter 13 are arranged within the water storing tank 8-2 and then the tank is divided into two segments. To its lower part is connected a water storing tank 8-2 divided into two segments with a pipe passage 15 and a valve 16. An iron substance contained in water 17 passes through the electromagnetic filter 13 to become water 18. The iron substance is removed by the electromagnetic filter 13, no iron substance is contained in water 18 and the feedwater 10 contains no iron substance, so that the iron is prevented from being adhered to a steam generating device. In addition, as a differential pressure is increased, the valve 16 is opened to cause water to flow in it, so that the water feeding is continuously carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron removing device installed inside a deaerator installed in a water supply facility of a thermal power and nuclear power plant.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a conventional deaerator. The deaerator 8 is composed of a deaeration chamber 8-1 and a water storage tank 8-2, and a communication section 8-3 communicates between them. There is. Deaeration chamber 8-1
The condensate 7 enters from the upper part of the water, and the condensate 7 is heated by the steam 9 to be deaerated, becomes saturated water, passes through the communication part 8-3, and flows into the water storage tank 8-2 from the inflow port 20. It becomes water 17 and is stored. After that, the water 17 is returned to the steam generator from the water supply port 21 as the water supply 10 by an external pump.

FIG. 2 is a system diagram of the entire turbine. Steam 2 from a steam generator 1 becomes water in a condenser 4 after having worked in a turbine 3, and then is boosted by a pump 5 and passes through a feed water heater 6. The condensed water 7 flows into the deaerator 8. The deaerator 8 is composed of a deaeration chamber 8-1 and a water storage tank 8-2, and the condensate 7 is heated by steam 9 in the deaeration chamber 8-1,
It is configured to be deaerated to become saturated water and flow into the water storage tank 8-2 to become water 17, which is then supplied to the pump 11 as the water supply 10 and further to the steam generator 1 via the water supply heater 12. ing.

[0004]

Since most of the equipment shown in FIG. 2 described above is made of steel, the condensate 7 contains iron, and the water storage tank 8-2 shown in FIG. In the water 17 therein, the form of this iron component is mostly magnetite. If this iron content is contained in the water supply 10, the iron content is brought into the steam generator 1, so that the iron content is accumulated inside the steam generator 1 and adheres to the heat transfer tube of the steam generator 1, etc. As a result, the performance is degraded, and this countermeasure is a major issue.

[0005]

In order to solve such a problem, the present invention provides a deaerator installed in a water supply facility of a power plant, wherein an electromagnetic filter is provided inside a water tank of the deaerator. By passing an electromagnetic filter from the upstream side in the water storage tank, the iron content contained in the stored water is removed as a structure to take out the feed water from the downstream side of the electromagnetic filter, and the pipeline and valve that bypass the electromagnetic filter are stored in the deaerator. It is installed in the tank to bypass water when the differential pressure rises abnormally on both sides of the electromagnetic filter.

[0006] That is, the present invention is a dewatering system which is installed in a water supply system of a power plant and has an inflow port for inflowing condensate from a steam turbine and a water supply port for deaerating this condensate and supplying it to a steam generator. In the vaporizer, an electromagnetic filter is provided together with a partition plate inside the water storage tank of the deaerator so that the water inlet is arranged on one side of the water tank and the water supply port is arranged on the other side. There is provided an iron removing device characterized in that the tank is divided into two and a pipe line with a valve that bypasses the electromagnetic filter is connected between the two divided water storage tanks.

[0007]

According to the present invention, the condensate from the turbine is heated by the steam in the deaerator and degassed by such means.
It becomes saturated water and flows into one side of the water storage tank from the inlet. The inflowing water passes through the electromagnetic filter, flows into the water storage tank on the other side, and is stored. At this time, the iron content contained in the water, that is, magnetite, etc., is adsorbed and removed by the filter part by the electromagnetic force of the electromagnetic filter, and therefore, on the other side of the water storage tank, that is, on the downstream side of the electromagnetic filter. Does not contain iron, so the water supplied from the water supply port does not contain iron.

Further, the valve of the valved conduit is normally closed,
If the differential pressure between the two sides of the electromagnetic filter becomes abnormally high, open the valve and guide the water through the conduit from one side of the water storage tank to the other side, that is, the downstream side of the electromagnetic filter.
Since water can be sent as water supply, the water supply to the steam generator will not be stopped.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of an iron removing apparatus according to an embodiment of the present invention, and corresponds to the deaerator 8 of the entire turbine shown in FIG.

In FIG. 1, reference numerals 7 to 10 are the same as those of the conventional deaerator shown in FIG. 3, and therefore the description thereof will be given as they are. However, the features of the present invention are the portions 13 to 16. Is. These will be described in detail below.

In the figure, a water storage tank 8-2 of the deaerator 8 is shown.
An electromagnetic filter 13 is provided inside the
The structure is such that the water supply 10 is taken out from the downstream side of the electromagnetic filter 13, and a conduit constituted by a conduit 15 and a valve 16 bypassing the electromagnetic filter 13 is provided in the lower portion of the water storage tank 8-2.

The electromagnetic filter 13 causes the water 2 to flow by electromagnetic force.
It is a device having a function of adsorbing and removing iron (magnetite) in 7.

The partition plate 14 prevents the water 17 in the water storage tank 8-2 from becoming high and the water 17 from flowing past the electromagnetic filter 13 to the downstream side.

In the embodiment having such a structure, the iron content contained in the water 17 flowing from the degassing chamber 8-1 through the communication portion 8-3 into the water storage tank 8-2 from the inflow port 20,
That is, since magnetite has magnetism, it is adsorbed by the electromagnetic force of the electromagnetic filter 13 and removed by the electromagnetic force of the electromagnetic filter 13 when passing through the electromagnetic filter 13. For this reason, the water 18 on the downstream side that has passed through the electromagnetic filter 13 does not contain iron, so that the water 10 that flows out from the water supply port 21 does not contain iron.

Normally, the valve 16 provided in the pipe line 15 is closed, but when the differential pressure of the electromagnetic filter 13 becomes abnormally high, the valve 16 is opened and water 17 passes through the pipe line 15. Leading to the downstream side of the electromagnetic filter 13 by
Since water can be sent as the water supply 10, the water supply 10 to the steam generator 1 is not stopped even in such a case. In addition,
The valve 16 may be manually operated, or it will be more effective if the valve is automatically opened upon detection of an abnormal differential pressure.

According to the iron removing apparatus of this embodiment, the condensed water 7 from the turbine 3 flows into the deaerator 8 and flows into the water storage tank 8-2 as water 17. Iron is contained in the water, and the iron is directly supplied to the water supply 10
Was returned to the steam generator 1. According to the present embodiment, the iron content contained in the water 17 is removed by the electromagnetic filter 13, so that the water 18 ie the water supply 10 does not contain the iron content, and the iron content can be prevented from being carried into the steam generator 1. The performance of the steam generator 1 can be remarkably improved as compared with the conventional one.

[0017]

As described above, according to the iron removing apparatus of the present invention described above, the iron content contained in the condensate from the steam turbine is removed by the electromagnetic filter, so that the water, that is, the feed water does not contain the iron content. Therefore, it is possible to prevent the iron content from being carried into the steam generator, which makes it possible to improve the performance of the steam generator as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an iron removing device according to an embodiment of the present invention.

FIG. 2 is a general system diagram of the entire turbine.

FIG. 3 is a configuration diagram of a conventional deaerator.

[Explanation of symbols]

 7 Condensate 8 Deaerator 8-1 Degassing chamber 8-2 Water storage tank 9 Steam 10 Water supply 13 Electromagnetic filter 14 Partition plate 15 Pipeline 16 Valve 17 Water 18 Water 20 Inlet 21 Water inlet

Claims (1)

[Claims] 1. A deaerator, which is installed in a water supply facility of a power plant and has an inlet for inflowing condensate from a steam turbine and a water inlet for deaerating this condensate and supplying it to a steam generator, An electromagnetic filter is provided together with a partition plate inside the water storage tank of the deaerator, and the water storage tank is divided into two parts so that the inflow port is arranged on one side of the water storage tank and the water supply port is arranged on the other side. In addition, the iron removing device is characterized in that a pipe line with a valve that bypasses the electromagnetic filter is connected between the two divided water storage tanks.