JPS6341518B2 - - Google Patents

Description

Detailed Description of the Invention The present invention is a method for urgently purifying condensate when the water quality of the condensate deteriorates rapidly due to condensate leakage etc. in nuclear power generation equipment. related to a device for Generally, for example, boiling water nuclear power generation facilities are
It is constructed as shown in the figures. That is, 1 is a nuclear reactor pressure vessel, and a reactor core (not shown) is accommodated in this reactor pressure vessel 1. The steam generated within the reactor pressure vessel 1 is sent to the turbine 3 via the main steam pipe 2, which drives the turbine 3, which in turn drives the generator 4 to generate electricity. It is configured as follows. The steam that drives the turbine 3 is condensed in a condenser 5 to become condensed water. Note that seawater is mainly used as the cooling medium for this condenser 5. and,
Condensate from the condenser 5 is pressurized by a low-pressure condensate pump 6, and is sent to a condensate purifier 9 via an air extractor 7 and a gland steam condenser 8. The condensate purification device 9 purifies the condensate by removing insoluble solids and soluble impurities from the condensate. The condensate that has passed through the condensate purification device 9 is further pressurized by a high pressure condensate pump 10, and is sent to a low pressure feed water heater 11 and heated. Then, the pressure of the water is further increased by the feed water pumps 12 . The condensate purification device 9 is provided with a plurality of condensate filtering towers 14 at the front stage, and a plurality of condensate demineralization towers 15 at the rear stage. As shown in FIG.
7 is pre-coated, and is configured to mainly remove insoluble solids from condensate. The condensate demineralization tower 15 has a granular ion exchange resin layer 18 therein as shown in FIG. 3, and is configured to mainly remove soluble impurities in the condensate. One of these condensate filter towers 14 and 15 is always on standby, and one of the condensate filter towers 14 is in operation.
...and the condensate desalination tower 15..., when their capacity has decreased, those with decreased capacity are removed from the system,
The water in the standby state is added to the system to continuously purify condensate. Then, the condensate filter tower 14 excluded from the system...
is reproduced by a reproduction device 19 as shown in FIG. Note that this Fig. 2 shows one condensate filter tower 1.
4 is shown, 20 is a strainer, and 21 is a holding pump. That is, 22 is a cation exchange resin hopper, and this cation exchange resin hopper 2
Powdered cation exchange resin is stored inside 2. Further, 23 is an anion exchange resin hopper in which a powdered anion exchange resin is stored. These cation exchange resin hoppers 22 and anion exchange resin hoppers 23
Opening/closing mechanisms 24, 25 are provided at the bottom of the tank 26, respectively, and when these opening/closing mechanisms 24, 25 are opened, the cation exchange resin and the anion exchange resin are supplied into the precoat tank 26. Water is supplied into the pre-coat tank 26 via a water supply valve 27, and a stirrer 28 mixes the water with the cation exchange resin and anion exchange resin to form an ion exchange resin slurry. It is composed of This ion exchange resin slurry is supplied into the condensate filter tower 14 by a slurry pump 29 via a valve 30. At the time of regeneration, the resin with reduced capacity pre-coated on the filtering element 16 in the condensate filtering tower 14 is removed by backwashing, and the removed waste resin is sent to the backwashing tank 31. It is configured as follows. Then, the ion exchange resin slurry in the precoat cylinder 26 is supplied to the condensate filter tower 14, and new cation and anion exchange resins are precoated onto the filter element 16 again for regeneration. There is. Further, the condensate demineralization tower 15 is also configured to be regenerated by a regenerator 32 as shown in FIG. In addition, only one condensate demineralization tower 15 is shown in FIG. 3, and 33 is a resin strainer that collects outflowing resin. That is, 34 is a cation exchange resin regeneration tower, and 35 is an anion exchange resin regeneration tower. Then, the granular resin discharged from the condensate demineralization tower 15 by backwashing is separated into a cation exchange resin and an anion exchange resin, and the cation exchange resin is sent to the cation exchange resin regeneration tower 34 and then to the anion exchange resin. The ion exchange resins are configured to be sent to anion exchange resin regeneration towers 35, respectively. Sulfuric acid and sodium hydroxide are passed through the cation exchange resin regeneration tower 34 and anion exchange resin regeneration tower 35, respectively, to restore the ion exchange capacity of the cation exchange resin and anion exchange resin. It is composed of Then, the cation exchange resin and anion exchange resin whose ion exchange capacity has been restored are sent to the resin storage tank 36, mixed, and sent to the condensate demineralization tower 15. Further, the sulfuric acid and sodium hydroxide passed through the cation exchange resin regeneration tower 34 and the anion exchange resin regeneration tower 35 are sent to the waste treatment facility 38 via the drain strainer 37, where solid components are separated. The solid components are transferred to solidification equipment 39.
The structure is such that it is sent to a factory for solidification. By the way, if a leak occurs inside the condenser 5, seawater will be mixed into the condensate, and the quality of the condensate will deteriorate rapidly. In such a case, the load on the above-mentioned condensate purification device 9 increases rapidly. However, the condensate filtering tower 1 of this condensate purification device 9
4... and condensate demineralization towers 15... must be regenerated one by one, so if the quality of condensate deteriorates rapidly, these condensate filter towers 14... and condensate demineralization towers 15... Regeneration must be performed frequently, making operation extremely cumbersome. Additionally, the amount of waste resin, sulfuric acid, and sodium hydroxide discharged also increased rapidly, causing problems such as interfering with the operation of waste treatment equipment. The present invention was made based on the above circumstances, and its purpose is to sufficiently cope with the sudden deterioration of condensate water quality due to contamination with seawater, etc., and to reduce the load on the condensate purification equipment. An object of the present invention is to obtain an emergency condensate purification system for nuclear power generation equipment that can prevent a sudden increase in water levels and ensure smooth operation of condensate purification equipment and waste treatment equipment. That is, in order to achieve the above object, the present invention provides a supply pipe 129 for supplying a slurry liquid consisting of a powdered cation exchange resin and an anion exchange resin to the condensate filter tower 114, as shown in FIG.
A branch pipe 140 is provided at the branch pipe 140, and this branch pipe 140 is connected to the upstream side of the condensate pump 106, so that when the water quality of condensate deteriorates, slurry liquid is injected from the branch pipe 140 to the upstream side of the condensate pump 106. It is characterized by the fact that Examples of the present invention will be described below. 4 to 6 show a first embodiment of the present invention, in which 101
is the reactor pressure vessel of a boiling water reactor. A reactor core (not shown) is housed within this reactor pressure vessel 101. The steam generated within this reactor pressure vessel 101 is transferred to the main steam pipe 102.
It is configured to be sent to a turbine 103 via the turbine 103 to drive the turbine 103, and the turbine 103 drives a generator 104 to generate electricity. The steam that drove this turbine 103 is condensed in a condenser 105 to become condensed water. Note that seawater is mainly used as a cooling medium for this condenser 105.
The condensate from the condenser 105 is pressurized by a low-pressure condensate pump 106 and sent to a condensate purification device 109 via an air extractor 107 and a gland steam condenser 108. There is.
The condensate purification device 109 purifies the condensate by removing insoluble solids and soluble impurities from the condensate. The condensate that has passed through the condensate purification device 109 is further pressurized by a high-pressure condensate pump 110...
It is sent to the low pressure feed water heater 111 and heated.
Then, the pressure of the water is further increased by the feed water pumps 112 . The condensate purification device 109 is provided with a plurality of condensate filtering towers 114 at the front stage and a plurality of condensate demineralization towers 115 at the rear stage. The above condensate filter tower 14... is the filter element 1
The surface of the ion exchange resin 117 is pre-coated with a powdered ion exchange resin 117, and is designed to mainly remove insoluble solids from condensate.
The condensate demineralization tower 115 has a granular ion exchange resin layer 118 therein, and is configured to mainly remove soluble impurities in the condensate. One of these condensate filtering towers 114... and condensate demineralization towers 115... is always on standby, and one of the condensate filtering towers 114... and condensate demineralization towers 115 is in operation. When the capacity decreases, those with decreased capacity are removed from the system, and those in a standby state are added to the system to continuously purify condensate. Then, the condensate filter tower 114 excluded from the system
... is reproduced by a reproduction device 119 as shown in FIG. Note that FIG. 5 shows only one condensate filter tower 114, and 120 is a strainer;
21 is a holding pump. That is, 122 is a cation exchange resin hopper, and a powdered cation exchange resin is stored in this cation exchange resin hopper 122. Reference numeral 123 is an anion exchange resin hopper 123 in which powdered anion exchange resin is stored. Opening/closing mechanisms 124, 125 are provided at the bottom of these cation exchange resin hopper 122 and anion exchange resin hopper 123, respectively, and when these opening/closing mechanisms 124, 125 are opened, the cation exchange resin and anion exchange resin are released. It is configured to be supplied into the precoat tank 126. Water is supplied into this pre-coat tank 126 via a water supply valve 127, and a slurry liquid (hereinafter referred to as ion exchange resin slurry) consisting of powdered cation exchange resin and anion exchange resin is supplied by a stirrer 128. ) is configured to be created. Then, this ion exchange resin slurry is supplied to the condensate filter tower 1 through a supply pipe 129a and valves 130a, 130b by a slurry pump 129.
14. During regeneration, the resin whose capacity has decreased and is pre-coated on the filtering element 116 in the condensate filtering tower 114 is removed by backwashing, and the removed waste resin is sent to the backwashing tank 131. It is configured as follows. Then, precoat tank 126
The ion exchange resin slurry in the condensate filter tower 114
re-precoating fresh cation and anion exchange resin onto the per element 114;
It is configured to perform playback. Further, the condensate demineralization tower 115 is also configured to be regenerated by a regenerator 132 as shown in FIG. Note that FIG. 6 shows only one condensate demineralization tower 115, and 133 is a resin strainer that collects the resin flowing out. That is, 134
135 is a cation exchange resin regeneration tower, and 135 is an anion exchange resin regeneration tower. And condensate demineralization tower 115
The granular resin discharged from the inside by backwashing is separated into a cation exchange resin and an anion exchange resin, and the cation exchange resin is sent to the cation exchange resin regeneration tower 134.
Furthermore, the anion exchange resin is configured to be sent to an anion exchange resin regeneration tower 135, respectively. And these cation exchange resin regeneration tower 1
Sulfuric acid and sodium hydroxide are passed through the anion exchange resin regeneration tower 34 and the anion exchange resin regeneration tower 135, respectively, so as to restore the ion exchange capacity of the cation exchange resin and the anion exchange resin. The cation exchange resin and anion exchange resin whose ion exchange capacity has been recovered are stored in the resin storage tank 1.
36 for mixing, and is configured to be sent to a condensate demineralization tower 115. In addition, the sulfuric acid and sodium hydroxide passed through the cation exchange resin regeneration tower 134 and the anion exchange resin regeneration tower 135 are sent to the waste treatment facility 138 via the drain strainer 137, where solid components are separated. The separated solid components are sent to a solidification facility 139 and are solidified. Further, a branch pipe 140 is provided in the supply pipe 129a between the slurry pump 129 and the valve 130. This branch pipe 140 is connected to the condensate pump 10
6, for example, the condensate pump 106 and the condenser 1
The ion exchange resin slurry is connected to the condensate pipe 141 provided between the condensate pump 106 and the condensate pump 106 . In addition,
Valves 142a and 142b are provided at both ends of the branch pipe 140.
is provided. The condenser 105 is also provided with a water quality detection mechanism 150 that detects the quality of the condensed water inside. This water quality detection mechanism 150 is provided with, for example, a conductivity detector 143, which constantly monitors the water quality of condensate. When the quality of the condensate deteriorates beyond a predetermined value, a signal is output from the conductivity detector 143 and the cation exchange resin hopper 12
2 and the opening/closing mechanisms 124 and 125 of the anion exchange resin hopper 123 are opened, and the cation and anion exchange resins are supplied into the precoat tank 126, and the water supply valve 127 is opened to supply water into the precoat tank 126. Lever pre-coat tank 12
6 and further operates a stirrer 128 to mix the resin and water to create an ion exchange resin slurry. At the same time, the slurry pump 129 is operated, and the valve 1
42a and 142b are opened, and the ion exchange resin slurry in the precoat tank 126 is supplied into the condensate pipe 141 via the emergency supply pipe 140. In the first embodiment of the present invention constructed as described above, condensate is normally purified by the condensate purifier 109 . For example, the condenser 10
If seawater leaks in the cation exchange resin hopper 122 and the quality of the condensate deteriorates rapidly, the conductivity detector 143 detects this condition, and the cation exchange resin hopper 122 and the negative The opening/closing mechanisms 124 and 125 of the ion exchange resin hopper 123 are opened, and positive and anion exchange resins are supplied into the precoat tank 126, and the water supply valve 127 is opened to supply water into the precoat tank 126. The stirrer 128 is operated to mix these resins and water to create an ion exchange resin slurry. Further, the slurry pump 129 is operated and the valves 142a and 142b are opened, and this ion exchange resin slurry is pumped into the branch pipe 140.
Through the condenser 105 and low pressure condensate pump 106...
It is supplied into the condensate pipe line 141 between... The ion exchange resin slurry supplied into the condensate pipe 141 is uniformly mixed in the condensate, adsorbs insoluble and soluble impurities in the condensate, and improves water quality. This resin is then transferred to the condensate purification device 10 along with the condensate via a low pressure condensate pump 106..., an air extractor 107, and a gland steam condenser 108.
Sent to 9th. And this resin is used in condensate purification device 1.
09 condensate filtering column 114 filtering element 116
Since it is in powder form similar to the resin pre-coated thereon, it is deposited on the over-element 116 and collected. Since this product mixes powdered cation and anion exchange resin into the condensate, its purification ability is extremely high, and even if the quality of the condensate deteriorates rapidly, it can quickly purify the condensate. The load on the condensate purification device 109 does not increase suddenly, and the condensate purification device 109 can be operated smoothly. Furthermore, this is the regeneration device 119 of the condensate filtering tower 114 of the condensate purification device 109.
It has a simple structure and can be easily implemented by making minor modifications to existing equipment. For example, FIGS. 7 and 8 show the second embodiment of the present invention.
An example is shown. This second embodiment is a condensate purification device 1.
An emergency condensate purification device 144 is provided, which is separate from the regeneration device 119 of the condensate filter tower 114 of No. 09. As shown in FIG. 8, this emergency condensate purification device 114 includes a cation exchange resin hopper 122', an anion exchange resin hopper 123', and a slurry preparation tank 1 similar to the regeneration device 119 of the condensate purification device 109 .
26', stirrer 128', slurry pump 129'
The configuration is similar to that of the playback device 119 of the first embodiment, and in FIGS. 7 and 8, parts corresponding to those of the first embodiment are given the same reference numerals. The explanation will be omitted. Furthermore, the present invention is not limited to the above embodiments. For example, an ion exchange resin capable of adsorbing both cations and anions can also be used, in which case only one hopper is required. In addition, the mechanism for creating ion exchange resin slurry by mixing ion exchange resin and water is not necessarily limited to the one described above. Alternatively, a replacement resin slurry may be prepared and continuously supplied into the condensate pipe. As described above, the present invention provides a branch pipe 140 in the supply pipe 129a that supplies a slurry liquid consisting of a powdered cation exchange resin and an anion exchange resin to the condensate filter tower 114, and connects this branch pipe 140 to the condensate filter tower 114. By connecting to the upstream side of the pump 106 and injecting slurry liquid from the branch pipe 140 to the upstream side of the condensate pump 106 when the water quality of the condensate deteriorates, the water quality of the condensate can be improved. Therefore, even if the quality of condensate deteriorates rapidly due to contamination with seawater, etc., the condensate filtering tower 114 and the condensate desalination tower 115 do not need to be regenerated frequently, reducing the load on the condensate purification device 109. can. In addition, along with this, condensate purification device 1
Since the amount of waste discharged from 09 can also be reduced, the operation of waste treatment equipment will not be hindered.
Furthermore, since the present invention can be easily implemented by only making minor modifications to existing equipment, the cost of modification can be reduced.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples, where Figure 1 is a schematic diagram of the overall configuration, Figure 2 is a schematic diagram of a condensate filtering tower and its regenerator, and Figure 3 is a diagram of a condensate desalination tower and It is a schematic block diagram of the reproduction|regeneration apparatus. 4 to 6 show a first embodiment of the present invention, FIG. 4 is a schematic diagram of the overall configuration, FIG. 5 is a schematic diagram of a condensate filter tower, a regeneration device, and an emergency condensate purification device, 6th
The figure is a schematic diagram of a condensate demineralization tower and its regeneration device. 101... Reactor pressure vessel, 103... Turbine, 105... Condenser, 109 ... Condensate purification device, 114... Condensate filter tower, 115... Condensate desalination tower, 119 ... Regeneration device , 132 ... playback device,
122,122′...Cation exchange resin hopper,
123,123′...Anion exchange resin hopper,
126... Precoat tank, 126'... Slurry preparation tank, 129, 129'... Slurry pump, 144 ... Water quality detection mechanism.

Claims (1)

[Claims] 1. A double water filtration tower that removes insoluble solids contained in condensate from a low-pressure condensate pump, and a condensate dewatering tower installed after this condensate filtration tower that removes soluble impurities contained in condensate. Regeneration of a nuclear power generation facility equipped with a salt tower and a regeneration device that supplies a slurry liquid consisting of a powdered cation exchange resin and an anion exchange resin into the condensate filter tower to regenerate the condensate filter tower. In the water purification device, a branch pipe is provided in the supply pipe for supplying the slurry liquid to the condensate filter tower, and the branch pipe is connected to the upstream side of the low-pressure condensate pump. Purification device.