JPH0824907B2 - Cladding precoat equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a feed water purification apparatus for a steam generator of a power plant, and is particularly suitable for preventing oil / fat and organic matters from adhering to a hollow fiber membrane filtration apparatus and clogging. The present invention relates to a cladded precoat device.

[Conventional technology]

The conventional hollow fiber membrane filtration equipment is thermal power nuclear power Vo.137.No.1
It has the structure shown in.

However, this document does not show any measures against the increase in the differential pressure due to the adhesion and blockage of the oil and fat component on the hollow fiber membrane and the difficulty of removal.

[Problems to be Solved by the Invention]

The above-mentioned prior art does not consider the point of preventing oil and fat from adhering to the hollow fiber membrane, and has a problem that the differential pressure increases due to blockage and that the differential pressure does not recover even after cleaning because it is difficult to remove.

An object of the present invention is to provide a clad precoat device which can prevent adhesion of oil and fats and organic substances to the hollow fiber membranes and can always ensure sufficient filtration performance even when it has a plurality of hollow fiber membrane filtration devices. Especially.

[Means for solving the problem]

The above-mentioned object is to connect a plurality of hollow fiber membrane filtration devices that are connected in parallel to the condensate system, and each have an inflow side valve and an outflow side valve on the inflow side and the outflow side of the condensate, respectively, to purify the condensate. In a clad precoating device for precoating a clad, an iron clad generating device for generating an iron clad, a pump for increasing the pressure of water containing the iron clad generated by the iron clad generating device, the hollow fiber membrane filtering device and its A first point located between the inlet side valve and the first side connecting the outlet side of the pump, and a second point located between the hollow fiber membrane filtration device and the outlet side valve. Point and a second pipe connecting the inlet side of the iron clad generator, and the first pipe branches downstream of the pump for each of the hollow fiber membrane filtration devices. Between the diverging point and the first point The second pipe is branched for each of the hollow fiber membrane filtration devices on the upstream side of the iron clad generation device, and the second pipe is provided between the branched point and the second point. It is achieved by having the valve of.

[Action]

According to the present invention, the iron clad is pre-coated on each hollow fiber membrane during the initial water passage of each hollow fiber membrane filtration device, so that the oil and fat components and organic matter in the condensate will adhere to the iron clad during normal operation. Therefore, it is possible to prevent oil and fat components and organic substances in the condensed water from directly adhering to the hollow fiber membrane. Along with this, it is possible to prevent an abnormal increase in the differential pressure of the hollow fiber membrane filtration device and prevent the differential pressure from not recovering.

In addition, backwashing is required by opening only the first valve and the second valve connected to the filtration apparatus that requires backwashing due to an increase in differential pressure among a plurality of hollow fiber membrane filtration apparatuses. Since the iron clad can be pre-coated after backwashing by separating only the filtered device that has become the above, other filtering devices can be fully utilized during this period, and a sufficient filtering performance can always be ensured.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to FIG.

The steam that has flowed into the steam turbine 1 flows into the condenser 2 where it is cooled and condensed. The pressure is increased by the low-pressure condensate pump 4, passes through the condensate pipe 3, and is purified by the condensate filtering device 7. The pressure is further raised by the high-pressure condensate pump 10, and the temperature is raised by the low-pressure feed water heater 11.

Condensed water whose pressure is further increased by the water supply pump 12 is further raised in temperature by the high-pressure water supply heater 13 and is supplied to the reactor 15 through the water supply pipe 14. The steam generated in the nuclear reactor 15 enters the steam turbine 1 through the steam pipe 16.

The extracted steam flows into the high-pressure feed water heater 13 through the steam pipe 17, condenses due to heat exchange with the condensate to become a drain, passes through the drain pipe 19, and flows into the low-pressure feed water heater 11. Extracted steam flows into the low-pressure feed water heater 11 through the steam pipe 18, and is condensed by heat exchange with condensate to form a drain.
It is collected in the condenser 2 through the. The water levels of the high-pressure feed water heater 13 and the low-pressure feed water heater are controlled by water level control valves 20 and 22, respectively.

The condensate filter device 7 includes a condensate inlet stop valve 5, an inlet pipe 6, an outlet pipe 8,
It is composed of an outlet stop valve 9.

The clad generated by the iron clad injection device 24 is pressurized by the injection pump 25, enters the inlet pipe 6 through the injection pipe 26 and the stop valve 27, and adheres to the condensate filtration device 7. The injection water from the outlet pipe 8 passes through the stop valve 28 and the return pipe 23, and the iron cladding injection device 24
Return to

 Next, the driving method will be described.

The inlet stop valve 5 and the outlet stop valve 9 of one tower of the condensate filter 7 are fully closed. The iron clad injection device 24 is operated to generate an iron clad, and the iron clad is injected into the inlet pipe 6 together with the condensate by the injection pump 25. The cladding is captured by the hollow fiber membrane in the condensate filter 7, and the condensate passes through the outlet pipe 8 and the outlet stop valve 2
8, Return to the iron cladding injection device 24 through the return pipe 23.

When the cladded pre-coat for the one tower is completed, the inlet valve 5,
The outlet valve 9, the inlet stop valve 27, and the outlet stop valve 28 are fully closed, and each of the other towers is opened and switched to precoat all the condensate filtration apparatus towers with cladding.

Next, the action of the condensate filter 7 on the hollow fiber membrane will be described with reference to FIGS. 2 and 3.

FIG. 2 shows a state in which oil and fat components adhere to the hollow fiber membrane after the condensate containing oil is passed through the hollow fiber membrane in the condensate filtration device and purified.

The hollow fiber membrane has a large number of pores of 0.1 μm, and allows pure water to permeate and filter impurities. Oils and fats have a high viscosity and adhere to the inside of the holes, increasing the differential pressure. Contrary to the flow direction during filtration,
Even if backwashing is performed by flowing condensate, the attached oil and fat cannot be removed, and the pressure difference cannot be recovered.

FIG. 3 shows the adhesion state of the oil / fat to the hollow fiber membrane after the pre-coating of the hollow fiber membrane with the cladding in advance and then passing the condensed water containing the oil / fat, according to the present invention. Since the oil and fat content in the condensate adheres to the pre-coated cladding in the initial stage, it does not adhere to the pores of the hollow fiber membrane. Therefore, the abnormal increase in the differential pressure does not occur, and the cladding can be removed from the hollow fiber membrane by backwashing water. At this time, however, the oil film is also removed, so that the differential pressure can be recovered.

According to this embodiment, the hollow fiber membrane of the condensate filter can be pre-coated with the cladding in advance, so that oil and fat or organic matter can be attached to the cladding in the plant to prevent the oil and fat from attaching to the holes of the hollow fiber membrane. Therefore, it is possible to prevent an abnormal increase in the differential pressure of the hollow fiber membrane, and it is possible to recover the pressure by backwashing.

Next, another embodiment of the present invention will be described with reference to FIG.

The feature of this embodiment is that the cladding contained in the feed water heater drain can be pre-coated on the hollow fiber membrane.

The overall structure is the same as that of the embodiment of the present invention shown in FIG. The drain of the high-pressure feed water heater 13 is boosted by the high-pressure drain pump 42 and is collected at the inlet side of the feed water pump 12, and the drain of the low-pressure feed water heater 11 is boosted by the low-pressure drain pump 43, and the high-pressure condensate pump. It is collected at the entrance side of 10. The drain of the low-pressure feed water heater 11 is branched from the downstream of the water level control valve 22, passes through the drain injection pipe 44 and the injection valve 45, is injected into the inlet pipe 6, is branched from the outlet pipe 8, and is collected into the recovery pipe 46 and the stop valve. 47
Return to condenser 2 through.

 Next, the driving method will be described.

When the condensate filtration device reaches a specified differential pressure by capturing impurities during the plant operation, the inlet stop valve 5 and the outlet stop valve 9 are fully closed and isolated, and the backwash removes the clad. Then the injection valve
45 is opened and the drain of the feed water heater containing a large amount of cladding is pre-coated on the hollow fiber membrane in the condensate filtration device 7 through the inlet pipe 6, and the condensed water is collected from the outlet pipe 8 to the recovery pipe 46 and the stop valve 4
It is collected in the condenser 2 through the 7.

The action on the hollow fiber membrane in the condensate filtration device 7 is the same as that of the embodiment of the present invention shown in FIG.

According to the present embodiment, in the cladding precoating on the hollow fiber membrane of the condensate filtration device, since the cladding contained in the water supply heat source drain can be used for precoating, after the backwashing of the condensate filtration device during plant operation, At the time of initial water passage, there is an effect that it is not necessary to operate the iron cladding injection device.

〔The invention's effect〕

According to the present invention, even when a plurality of hollow fiber membrane filtration devices are provided, it is possible to prevent the fats and oils and organic matter in the condensate from adhering to the hollow fiber membranes, and always ensure sufficient filtration performance. it can.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention, FIGS. 2 and 3 are sectional views of a hollow fiber membrane, and FIG. 4 is a system diagram of another embodiment of the present invention. 1 ... Steam turbine, 2 ... Condenser, 3 ... Condenser pipe, 4
...... Lower condensate pump, 5 …… Inlet stop valve, 6 …… Inlet pipe,
7 ... Condensate filter, 8 ... Exit pipe, 9 ... Exit stop valve.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ken Ueno Ken 1-1 Uchimachi, Hitachi, Ibaraki 3-1-1 Hitachi Factory, Hitachi Works (56) References JP 63-252507 (JP, A) Kaisho 61-185372 (JP, A)

Claims (2)

[Claims] 1. A plurality of hollow fiber membrane filtration devices for purifying condensate, which are connected in parallel to a condensate system, each having an inflow side valve and an outflow side valve on an inflow side and an outflow side of the condensate, respectively. In a clad precoating device for precoating an iron clad, an iron clad generating device for generating an iron clad, a pump for increasing the pressure of water containing the iron clad generated by the iron clad generating device, and each of the hollow fiber membrane filtration devices, A first point located between the inlet side valve and the first side connecting the outlet side of the pump, a first point located between the hollow fiber membrane filtration device and the outlet side valve. 2 points, and a second pipe connecting the inlet side of the iron clad generator, the first pipe is branched for each of the hollow fiber membrane filtration device downstream of the pump, The branched point and the first
The second pipe is branched for each of the hollow fiber membrane filtration devices on the upstream side of the iron clad generation device, and the second point and the second point. A clad precoating device comprising a second valve between the point and the point. 2. The clad according to claim 1, further comprising a third pipe for supplying the drain of the feed water heater between each of the hollow fiber membrane filtration devices and the first point. Precoat equipment.