JPS6273086A - Recirculation equipment for condensate demineralizer - Google Patents

Abstract

PURPOSE:To control resin runoff to a condenser and perform recirculation efficiently by connecting to a condensor branch pipes which are further branched from branch pipes of outlet pipes at condensate demineralizers in recirculation equipment for condensate demineralizers in electric power plant. CONSTITUTION:Condensate condensed in a condenser 1 is gathered in a condenser hotwell 2 and transferred into condensate demineralizers 7 through a condensate pump 4, steam type air extractor 5, and a gland steam condenser 6 and purified and heated by a feed water heater 8 and then introduced again into an atomic reactor 9. Condensate of the condensate demineralizers 7 of which regeneration operation is finished after a specified quantity of impurities are captured is returned back to the upstream side from recirculation pipes 12 by a recirculation pump 13 and then flows into each condensate demineralizer 7. At that time, as recirculation operation is carried out in quantity of about 30-50% of normal flow rate, runoff of damaged resin, gas, and other impurities which are unable to be removed is controlled and said impurities etc. are able to be returned back to the upper parts of the condensate demineralizers. Further, condensate is returned back to the condenser hotwell 2 by a recirculation pipe 14 and recirculated in quantity of 100% flow rate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a recirculation device for a condensate desalination device in a power plant.

[Technical background of the invention and its problems]

The steam generated in the steam generator of the power plant rotates the turbine, becomes condensed water in the condenser, is collected in the hot well, is further purified in the condensate desalination equipment, is heated in the feed water heater, and is recycled again. returned to the steam generator.

By the way, the condensate desalination apparatus is filled with an ion exchange resin, and is configured to adsorb impurities present in the condensate with the ion exchange resin, thereby increasing the purity of the condensate. Therefore, if the ion exchange resin captures more than a certain amount of impurities, its function deteriorates, and in that case, the ion exchange resin is backwashed and regenerated or chemically regenerated before being reused.

To regenerate such ion-exchange resin, there are two methods: transporting it to a regenerator installed separately from the condensate desalination device, performing regeneration operations, and then returning it to the condensate demineralization device, and regenerating it within the condensate desalination device. There are cases where it is done.

Thus, with the regenerated ion exchange resin installed in the condensate desalination apparatus, a recirculation operation is first performed before it is put into operation. This recirculation operation returns the water that has passed through the condensate desalination equipment upstream as outlet water, rather than flowing it downstream, and its purpose is to improve operational performance.

By moving the resin that was damaged during the regeneration operation or resin transfer and was not removed during the regeneration operation to the upper part of the resin layer, the resin is prevented from flowing downstream, and when the resin is passed through water, ions are captured and the cladding is removed. This is to increase the packing density of the resin by effectively capturing the resin.

This recirculation operation includes a method of recirculating with a recirculation pump and a method of returning the condensate desalination outlet water to the condenser.

If the recirculation pump is used in Jishiya, a large pump will be required to flow the water flow rate of the condensate desalination equipment, and there may be disadvantages such as space consumption and power consumption, so it is not recommended for nuclear power generation plan 1. About 30 to 50% of the water flowing upstream of the condensate desalination device 7 is used, and about 60 to 80% of the water flow is used in thermal power plants.

In addition, when returning the latter to the condenser, the ion exchange resin flows out, and these resins, etc., including the flowed out ion exchange resin, accumulate in the hot well section of the condenser where the flow rate is very slow and other stagnation sections. There are many possibilities, and in actual practice in thermal power plants, a water flow rate of about 40 to 60% of the water flow rate of the condensate desalination equipment is used.

For these reasons, it has been desired to develop a recirculation system for a condensate desalination apparatus that efficiently recirculates the condensate desalination apparatus.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and its purpose is to efficiently perform recirculation in the recirculation operation that is carried out after the regeneration operation of the condensate desalination equipment and before the water is passed through. An object of the present invention is to provide a recirculation device for a condensate desalination device that can perform the following steps.

[Summary of the invention]

In order to achieve the above object, the present invention connects a first branch pipe branched from an outlet pipe of a condensate desalination device that desalinates condensate obtained from a condenser to the condensate water via a recirculation pump. In the condensate desalination equipment recirculation device connected to the inlet pipe of the desalination equipment, a second branch pipe further branched from the first branch pipe is provided, and the second branch pipe is connected to the 11η storage condenser. The present invention relates to a recirculation device for a condensate desalination device.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to the drawings.

The figure shows a system diagram of an embodiment of the present invention.
The condensed water is collected in the condenser hole 1-well 2, passes through the condensate piping 3, passes through the condensate pump 4, the steam air extractor 5, and the grand steam condenser 6 to the condenser 1. The water enters the desalination equipment 7, is purified, is heated by the downstream feed water heater 8, and then flows into the nuclear reactor 9 again.

The condensate desalination devices 7 are installed in parallel in a double water method, and water is passed through them at the same time. In addition, a recirculation pipe (first branch pipe) 12 branched from the outlet pipe 11 of the condensate desalination device 7 is connected to a recirculation pump 13.
It is connected to the inlet piping of the condensate desalination device 7 via.

The recirculation piping 12 is further branched and a recirculation condenser piping (second branch piping) +4 is installed which is connected to the condenser hot well 2 or the upper part of the condenser hot well.

By the way, when one of the condensate desalination devices 7 captures a predetermined amount of impurities, the valve of the condensate desalination device 7 is closed and the condensate desalination device 7 is removed from the system and regenerated. An operation is performed. After completing this regeneration operation, the condensate desalination device 7 operates the recirculation pump 13 for recirculation. At this time, the condensate is returned to the upstream side of the condensate demineralizer 7 by the recirculation pump 13 from the recirculation pipe 12 that branches from the demineralizer outlet pipe 11 upstream of the outlet valve 10, and is sent to each condensate demineralizer 7. enter. At this time, the recirculation operation is performed at about 30 to 50% of the flow rate during normal water flow, so that the damaged resin that is damaged during normal water flow, regeneration operation, and transfer and cannot be removed during regeneration operation becomes gas and Other impurities do not flow downstream and can be returned to the upper part of the condensate desalination device from the second stream.

Furthermore, it is returned to the condenser hotwell 2 or the upper part of the condenser hotwell through the recirculation condenser piping 14 connected to the condenser out of the recirculation piping, and is sent from the condensate pump 4 to the condensate desalination device 7 upstream. Perform recirculation.

This flow rate is 100% of the flow rate during normal water flow in the condensate desalination equipment 7.
Good flow rate. By this operation, the damaged resin that could not be returned to the upstream side of the condensate desalination device by the recirculation pump 13 can be brought into the upstream stream, and the gas remaining in the upper part of the condensate desalination device 7 can be removed. A stable resin bed can be obtained with this recirculation operation. Note that the intended purpose of the present invention can be achieved even if the recirculation line flow rate to the condenser is set to 30 to 50% of the flow rate during normal water flow, and the flow rate at the recirculation pump is set to 100% flow rate.

〔Effect of the invention〕

As explained above, according to the present invention, the amount of water that was conventionally passed at 30 to 50% of the normal water flow rate of the condensate desalination equipment has been reduced to 10%.
Since water can flow down to 0%, the amount of broken resin, gas, and other impurities that conventionally flowed downstream of the condensate desalination equipment after normal water flow can be reduced. When returning the resin to the condenser, we combined the operation of returning the condensate to the upstream of the condensate desalination equipment using a recirculation pump and the operation of returning it through the branch piping leading to the condenser, thereby reducing the risk of resin entering the condenser. This has the effect of suppressing outflow.

[Brief explanation of drawings]

The figure is a system diagram of an embodiment of the present invention. 1... Condenser, 3... Condensate piping 4.-
Condensate pump, 7... Condensate desalination device 8 Feed water heater, 9... Reactor IO... Outlet valve,
11... Condensate desalination equipment outlet piping 12... Recirculation piping,
13... Recirculation pump 14... Recirculation condenser piping agent Patent attorney Nori Chika Yudo Hirofumi Mitsumata

Claims (3)

[Claims] (1) A first branch pipe branched from the outlet pipe of the condensate desalination equipment that desalinates the condensate obtained from the condenser is connected to the inlet pipe of the condensate desalination equipment via a recirculation pump. In the recirculation device for a condensate desalination apparatus, a second branch pipe further branched from the first branch pipe is provided, and the second branch pipe is connected to the condenser. Recirculation device for water desalination equipment. (2) The flow rate to the first branch pipe is from 30 to the normal flow rate when water is flowing.
A recirculation device for a condensate desalination device according to claim 1, wherein the recirculation rate is 50% or 100%. (3) The flow rate to the second branch pipe is 100% of the flow rate during normal water flow.
% or 30 to 50%.