JPH03117802A - Desalination treatment system - Google Patents

Abstract

PURPOSE:To maintain proper performance of the condensate desalination device all the time by controlling valve means so as to close a first pipe passage and open a second pipe passage when the temperature of the inlet water of a desalination device that is measured by a temperature sensor rises above a specified value. CONSTITUTION:A temperature sensor 41 detects the temperature of the water at the inlet of a condensate desalination device which is a mixture of the condensate and the drain from a supply water heater, and the detected temperatures are sent to a temperature switch 42. The temperature switch 42 operates when the temperature detected by the temperature sensor 41 reaches the maximum temperature of use for resin, for example 60 deg.C, and it outputs the signal of opening to a supply valve 32 and signal of closing to a supply valve 29. With the supply valve 32 open and the supply valve 29 closed, the drain of the supply water heater is recovered on the side of the outlet of a condensate desalination device 15. With high temperature of the water at the inlet of the condensate desalination device the recovery point of the drain of the supply water heater is switched from the inlet of the condensate desalination device to its outlet, and by limiting the treatment in the condensate desalination device only to the condensate, it can be prevented that the inlet water temperature of the condensate desalination device exceeds the maximum temperature of use for resin and the lowering of the performance and the decomposition of the resin in the condensate desalination device are prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a desalination treatment system for treating condensate and heater drain in a condensate system of a power plant, and in particular, a desalination treatment system for treating condensate and heater drain in a condensate system of a power generation plant. The present invention relates to a desalination treatment system suitable for preventing a rise in temperature of water treated by a desalination apparatus due to temperature changes and for preventing performance deterioration of a condensate desalination apparatus.

[Conventional technology]

Conventionally, the condensate system of a thermal power plant or a nuclear power plant has a configuration as shown in FIG. After being filtered, the condensate is sent through an inlet pipe 14 to a condensate demineralizer comprising a plurality of condensate demineralizers 15, where it is desalinated. The condensate treated in the condensate demineralizer 15 is sent to the outlet pipe 1
6, the water is pressurized by a high-pressure condensate pump 17, heated by a feed water heater 18, and sent to the downstream system.

In addition, the heating side drain of the feed water heater 18 is connected to the feed water heater 1
8, the feed water heater drain tank 22 is connected via the pipe line 21.
After being recovered, it passes through the pipe line 23 and is pressurized by the drain pump 24. The drain whose pressure has been increased by the pump 24 is transferred to the pipe line 28
, through a supply valve 29 for drain supply control and a conduit 30, and joins with condensate at an inlet pipe 14, mixed with condensate, desalinated in a condensate demineralizer 15, and sent to the downstream system.

Here, the drain pump 24 that increases the pressure of the feed water heater drain
If condensate cannot be merged into the inlet pipe 14 due to a malfunction or the like, the condensate is collected from the condenser 11 via the condensate supply control supply valve 26 and the condensate condensate conduit 27 from the conduit 25, and mixed with condensate.
The pressure is increased by a low-pressure condensate pump 12, and the condensate is filtered and desalted by a condensate filtration device 13 and a condensate demineralizer 15.

Note that related devices of this type include, for example,
Examples include Utility Model Application No. 62-39108.

[Problem to be solved by the invention]

By the way, the condensate demineralizer 15 used in thermal power plants and nuclear power plants removes impurities in the condensate and feedwater heater drain by passing the condensate through a column that houses anion exchange resin and cation exchange resin. However, the maximum operating temperature of anion exchange resin is usually around 60°C, so if the water at the inlet of the condensate desalination equipment exceeds 60°C, the anion exchange performance will decrease and the resin will deteriorate. Elution of amine occurs due to decomposition of

Here, the condensate temperature in the atomic coupler is 20°C to 50°C during normal operation, and the maximum operating temperature is 66°C, and the feedwater heater drain temperature is 80°C to 90°C during normal operation.
The maximum operating temperature is generally 150°C.

In the system in which the feed water heater drain is collected at the condensate demineralizer inlet described above, the condensate temperature is high because the condensate and the feed water heater drain are mixed and then supplied to the condensate demineralizer 15. If the supply heater drain temperature is also high, since the temperature of the condensate demineralizer inlet water is not controlled, the maximum resin usage temperature of the condensate demineralizer 15 will exceed 60°C, and the condensate demineralizer 15 will There were problems with demineralization performance and decomposition of the resin.

An object of the present invention is to provide a desalination treatment system that controls the inlet water temperature of a condensate desalination device so that it does not exceed the maximum operating temperature of the resin, and that maintains the performance of the condensate desalination device appropriately at all times. It is in.

[Means to solve the problem]

According to the present invention, for the above purpose, a desalination device is installed between a condenser and a heater that heats the condensate discharged from the condenser, and a drain from the heater is connected upstream of the desalination device. In a desalination treatment system, the condensate and drain mixture that has been combined is processed in a desalination device, and the drain from the heater is downstream of the desalination device. a second pipe line for merging, a valve means provided in the first and second pipe lines, a temperature detection device for measuring the inlet water temperature of the desalination device, and a temperature detection device for measuring the temperature of the water at the inlet of the desalination device; A desalination treatment system is provided, comprising: control means for controlling the valve device to close the first pipe line and open the second pipe line when the inlet water temperature of the salt apparatus exceeds a predetermined value. Ru.

Preferably, the control means has a timer, and when the temperature of the inlet water of the desalination apparatus exceeds a predetermined value, the control of the valve means is performed after a predetermined period of time has elapsed.

Preferably, the valve means includes first and second valve devices provided in the first and second pipes, respectively, and the control means is configured to control the inlet water temperature of the desalination device to a predetermined value. When the water temperature exceeds the predetermined value, the second valve device is first opened after a certain period of time has passed, and after confirming that the inlet water temperature of the desalination device still exceeds the predetermined value, the first valve device is opened. Allow the valve device to close.

The valve means includes first and second valve devices provided in the first and second pipes, respectively, and the control means controls when the inlet water temperature of the desalination device exceeds a predetermined value. , calculates the opening ratio of the first and second valve devices to maintain the predetermined value, and adjusts the opening ratio of the first and second valve devices so that this opening ratio is achieved.
The valve opening degree of the valve device may be adjusted.

Further, a third pipe line that supplies drain from the heater to the condenser may be used instead of the second pipe line described above.

[Effect]

In the present invention configured in this manner, when the inlet water temperature of the desalination apparatus exceeds a predetermined value, the control means closes the first pipe line and opens the second pipe line or the third pipe line. Since the valve device is controlled, the condensate from the heater, which has a higher temperature than the condensate, does not flow upstream of the desalination equipment, but in the case of the second pipe, it flows downstream of the desalination equipment, and the condensate flows into the third pipe. In the case of a road, it is supplied to a condenser and cooled. For this reason, the inlet water temperature of the desalination equipment will be below a predetermined value, so by setting the predetermined value as the maximum operating temperature of the resin, the inlet water temperature of the desalination equipment will be controlled so as not to exceed the maximum operating temperature of the resin. This makes it possible to maintain proper performance of the desalination equipment at all times.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, the system configuration in which the condensate demineralizer 5 processes condensate and feedwater heater drain is unchanged from the conventional system. That is, the condensate flowing out from the condenser 11 is pressurized by the low-pressure condensate pump 12, filtered by the condensate filtration device 13, and then passed through the inlet pipe 14 to a plurality of condensate demineralizers 15. The condensate is sent to the desalination equipment and desalinated. The condensate treated in the condensate demineralizer 15 passes through an outlet pipe 16, is pressurized by a high-pressure condensate pump 17, is heated by a feed water heater 18, and is sent to the downstream system.

In addition, the heating side drain of the feed water heater 18 is connected to the feed water heater 1
8, the feed water heater drain tank 22 is connected via the pipe line 21.
After being recovered, it passes through the pipe line 23 and is pressurized by the drain pump 24. The drain whose pressure has been increased by the pump 24 is transferred to the pipe line 28
, passes through the supply valve 29 for drain supply control and the pipe 30, joins the condensate at the inlet pipe 14, is mixed with the condensate, is desalinated in the condensate demineralizer 15, and is sent to the downstream system. It will be done.

Here, the drain pump 24 that increases the pressure of the feed water heater drain
If condensate cannot be joined to the inlet pipe 14 due to a malfunction, etc., open the supply valve 26 for condensate supply control provided in the conduit 25, and condensate is supplied from the conduit 25 through the supply valve 26 and conduit 27. After being collected in a vessel 11 and mixed with condensate, the pressure is increased by a low-pressure condensate pump 12, and the condensate is filtered and desalted by a condensate filtration device 13 and a condensate demineralizer 15. And, in this example,
In addition to the configuration described above, lines 31.33 supplying the feedwater heater drain to the outlet pipe of the condensate desalination device, these lines 31.
A supply valve 32 for drain supply control according to 33 is installed, and a temperature detector 41 and a temperature switch 42 are installed at the inlet pipe 14 of the condensate desalination device.

The temperature detector 41 detects the concentration of condensate desalination equipment inlet water in which condensate and feed water heater drain are mixed, and transmits it to the temperature switch 42 . The temperature switch 42 operates when the temperature detected by the temperature detector 41 reaches the maximum operating temperature of the resin, for example 60° C., and outputs an open signal for the supply valve 32 and a close signal for the supply valve 29.

FIG. 2 shows a logic diagram of the condensate desalination apparatus inlet water temperature control by the temperature switch 42. Supply valve 29
If the supply valve 3 is open and the concentration of water at the inlet of the condensate desalination device exceeds the maximum operating temperature of the resin, for example 60°C, and the temperature continues to be high after a certain period of time set by the timer T, the supply valve 3
2 is opened, and the supply valve 29 is closed under the AND condition of the open signal of this valve 32 and the continuous high temperature of the condensate demineralizer inlet water, so that the feed water heater drain is connected to the condensate demineralizer. It is collected on the exit side. Further, if the concentration of water at the inlet of the condensate desalination apparatus exceeds the maximum operating temperature of the resin and the temperature continues to be high after a certain period of time set by timer T has elapsed, an alarm A will issue a warning of high temperature (H).

Here, if the feedwater heater drain is recovered downstream of the condensate desalination equipment, the feedwater heater drain will not be desalinated, but the water quality of plant feedwater heater drain in recent years has impurities of about 11111b. Therefore, there is little impact on the downstream system of the condensate desalination equipment.

According to this embodiment, when the temperature of the condensate desalination equipment inlet water is high,
By switching the recovery light of the feedwater heater drain from the inlet to the outlet of the condensate desalination equipment and allowing the condensate desalination equipment to process only the condensate, the water concentration at the inlet of the condensation demineralization equipment can be adjusted to the maximum operating temperature of the resin. This can prevent the performance of condensate demineralizer resin from exceeding
and has the effect of preventing decomposition.

Another embodiment of the present invention will be described with reference to FIG.

In this embodiment, the existing pipe line 25 is used to supply the feedwater heater drain to the outlet of the condensate desalination equipment, and the feedwater heater drain is drained at the high temperature of the water at the condensate desalination equipment inlet. is collected into a condenser. That is, the temperature switch 42 is connected to the supply valves 26 and 29, and when the high temperature of the water at the inlet of the condensate demineralizer is detected by the temperature sensor 41, the temperature switch 42 opens the supply valve 26 and then closes the supply valve. 29 is closed, the feed water heater drain is collected in the condenser 11, and after being cooled in the condenser, it is treated in the condensate demineralizer 15.

Even in this case, the same effect as the embodiment shown in FIG. 1 can be obtained.

Still another embodiment of the present invention will be described with reference to FIG. In this embodiment, the opening ratio of the supply valve 29 and the supply valve 32 is automatically controlled so that the concentration of water at the inlet of the condensate desalination apparatus does not exceed a specified temperature. That is, a temperature controller 45 is provided in place of the temperature switch 42 in the embodiment shown in FIG.
Drive controllers 46 and 47 operated by a signal from the temperature controller 45 are provided at 2.

The condensate desalination equipment inlet water concentration is detected by a temperature detector 41 and transmitted to a temperature controller 45. In the temperature controller 45, when the temperature detected by the temperature detector 41 reaches a specified temperature, the opening ratio of the supply valve 29.32 is calculated so as not to exceed this temperature, and the signal is sent to the drive controller 46.47. send. The drive controllers 46 and 47 respectively adjust the valve openings of the supply valves 29 and 32 so as to obtain the opening ratio determined by the temperature controller 45.
The amount of feed water heater drain collected into the condensate desalination device inlet pipe 14 is adjusted. As a result, the concentration of water at the inlet of the condensate demineralizer is adjusted to be below the maximum operating temperature of the condensate demineralizer resin.

〔Effect of the invention〕

According to the present invention, the feedwater heater drain collected at the condensate desalination equipment inlet is automatically transferred to the condensate desalination equipment outlet or the feedwater heater drain when the water temperature at the condensate demineralization equipment inlet is high. Since it is collected in a condenser that can be cooled, it has the effect of preventing performance deterioration and decomposition of the condensate demineralizer resin.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a desalination treatment system according to an embodiment of the present invention, FIG. 2 is a control logic diagram of the operation performed by the temperature switch of FIG. 1, and FIG. FIG. 4 is a schematic configuration diagram of a desalination treatment system according to an embodiment of
The figure is a schematic configuration diagram of a desalination processing system according to still another embodiment of the present invention, and FIG. 5 is a schematic configuration diagram of a conventional desalination processing system. Explanation of symbols 11...Condenser 14...Inlet pipe 15...Condensate demineralizer (desalination device) 16...Outlet pipe 18...Feed water heater 25.27...Pipe Channel (third pipe line) 26... Supply valve (valve means) 28.30... Pipe line (first pipe line) 29... Supply valve (valve means; first valve device) 31 .33
...Pipe line (second pipe line) 32... Supply valve (valve means; second valve device) 41...
Temperature detector 42... Temperature switch (control means) 45... Temperature controller (control means)

Claims (5)

[Claims] (1) A desalination device installed between a condenser and a heater that heats the condensate discharged from the condenser, and a first pipe line that joins the drain from the heater upstream of the desalination device. and
A desalination treatment system in which the mixed water of the combined condensate and drain is processed in a desalination device, comprising: a second pipe line that connects the drain from the heater downstream of the desalination device; and a valve means provided in a second pipe line, a temperature detection device for measuring the inlet water temperature of the desalination device, and when the inlet water temperature of the desalination device measured by the temperature detection device exceeds a predetermined value. A desalination processing system comprising: a control means for controlling the valve device to close the first pipe line and open the second pipe line. (2) In the desalination processing system according to claim 1, the control means has a timer, and when the temperature of the inlet water of the desalination apparatus exceeds a predetermined value, the valve means is controlled after a certain period of time has elapsed. A desalination processing system featuring: (3) In the desalination treatment system according to claim 1, the valve means has first and second valve devices provided in the first and second pipes, respectively, and the control means When the inlet water temperature of the desalination equipment exceeds a predetermined value, first open the second valve device after a certain period of time has passed, and the second valve device opens and the inlet water temperature of the desalination equipment still exceeds the predetermined value. A desalination processing system characterized in that the first valve device is closed after confirming that. (4) In the desalination treatment system according to claim 1, the valve means includes first and second valve devices provided in the first and second pipes, respectively, and the control means When the inlet water temperature of the desalination equipment exceeds a predetermined value, the opening ratio of the first and second valve devices is calculated to maintain the predetermined value, and the opening ratio of the first and second valve devices is calculated to maintain the predetermined value. A desalination processing system characterized by adjusting a valve opening degree of a second valve device. (5) A desalination device installed between a condenser and a heater that heats the condensate discharged from the condenser, and a first pipe line that joins the drain from the heater upstream of the desalination device. and
A desalination treatment system comprising a third pipe line that processes the mixed water of the combined condensate and drain in a desalination device and supplies drain from the heater to the condenser. a valve means provided in the first and third pipes; a temperature detection device for measuring the inlet water temperature of the desalination device; and a temperature detection device that measures the inlet water temperature of the desalination device exceeding a predetermined value as measured by the temperature detection device. and a control means for controlling the valve device to close the first pipe line and open the second pipe line.