JP2015147189A - Condensate demineralization system and condensate demineralization method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress equipment costs included in initial costs of a power plant and an installation space.SOLUTION: Demineralization facilities are shared by a first turbine cycle and a second turbine cycle by: connecting water flow inlet portions of a plurality of demineralization vessels 2a through 2e to a water supply path of a unit 1 system provided with demineralization vessel inlet valves 5a through 5e and a water supply path of a unit 2 system provided with demineralization vessel inlet valves 5a through 5e; connecting water flow outlet portions of the plurality of demineralization vessels 2a through 2e to an outlet path of the unit 1 system provided with demineralization vessel outlet valves 8a through 8e and an outlet path of the unit 2 system provided with demineralization vessel outlet valves 8a through 8e; connecting the water supply path and the outlet path of the unit 1 system to the first turbine cycle; and connecting the water supply path and the outlet path of the unit 2 system to the second turbine cycle.

Description

  Embodiments described herein relate generally to a condensate demineralizer and a condensate demineralization method for removing impurity ions contained in condensate of a steam turbine.

  In general, in a power plant such as a thermal power plant, high-purity water is heated in a boiler to produce steam, the steam turbine is driven by this steam to generate power, and the steam that has finished expansion work is recovered by the steam turbine. The cycle of cooling with a water vessel and collecting it as condensate and heating the condensate again with a boiler to produce steam (this is called a turbine cycle) is repeated. In this turbine cycle, it is necessary to remove contaminants such as various impurity ions and metal oxides in the condensate in order to process the condensate into high-purity feed water and send it to the boiler.

  For this reason, in a power plant, a condensate demineralizer is installed in the condensate system to remove impurity ions contained in the condensate and satisfy the water quality required by the boiler.

  The condensate demineralizer is mainly desalted with a plurality of desalting towers filled with ion exchange resins such as cation exchange resin (cation resin) and anion exchange resin (anion resin). Regeneration equipment that regenerates ion exchange resin, equipment that supplies chemicals, and water supply and drainage equipment that supplies and discharges condensate to the desalting tower. These equipment costs and installation space reduce the initial cost of the power plant. It is one of the factors that increase. In addition, in a power plant, running costs are incurred due to replacement of chemicals and resins for regenerating ion exchange resins and periodic maintenance of facilities even after the start of operation.

  As this type of conventional technology, a technology for reducing the size of the condensate demineralizer as a whole by using a single ion exchange resin regeneration facility as a common facility for a plurality of desalting towers. By adjusting the number of desalting towers that pass water among the desalting towers of the base and controlling the amount of desalting treatment water, the frequency of ion-exchange resin regeneration treatment and the use of chemicals can be reduced to keep running costs low. Technology has been developed.

JP 2001-029801 A JP 2005-329314 A

  However, since one unit of condensate demineralization equipment is installed in one turbine cycle in the above-described conventional technology, the number of installed desalting towers cannot be suppressed, and the initial cost as a power plant is reduced. The occupied equipment cost and installation space cannot be suppressed.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and is configured so that a single unit of condensate demineralization equipment can be used as a common equipment in a plurality of turbine cycles. It is another object of the present invention to provide a condensate demineralization apparatus and a condensate demineralization method that can reduce installation space and reduce running costs.

  In order to solve the above problems, a condensate demineralization apparatus according to an embodiment of the present invention is connected to a plurality of demineralization towers filled with an ion exchange resin and a condensate system of a turbine cycle of a power plant. A water supply path for supplying condensate from the condensate system to the demineralizer, an outlet path for returning the condensate discharged from the demineralizer to the condensate system of the turbine cycle, and a dewatering provided in the water supply path In the condensate demineralization apparatus, comprising a salt tower inlet valve and a desalting tower outlet valve provided in the outlet path, and removing impurity ions contained in the condensate by the demineralizer, the turbine cycle And the feed water path and the outlet path of each turbine cycle are connected to the respective desalting towers.

1 is a schematic system diagram of a condensate demineralizer showing Embodiment 1 of the present invention. (A) is a figure which shows the detection level of the unit inlet water quality measuring instrument which measures the water quality of the condensate which flows through an inlet pipe, (b) is the detection level of the outlet water quality measuring instrument which measures the water quality of the condensate which flows through an outlet pipe. FIG. The schematic system diagram of the condensate demineralization apparatus which shows Embodiment 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, about the apparatus and components which are common throughout each figure, the overlapping description is abbreviate | omitted suitably by giving the same code | symbol.

(Embodiment 1)
Hereinafter, Embodiment 1 of the condensate demineralization system according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic system diagram of a condensate demineralization apparatus showing Embodiment 1 of the present invention, and FIG. 2 (a) shows a detection level of a unit inlet water quality measuring instrument for measuring water quality of condensate flowing through an inlet pipe. (B) is a figure which shows the detection level of the outlet water quality measuring instrument which measures the quality of the condensate which flows through an outlet pipe.

(Constitution)
In FIG. 1, a portion surrounded by a broken line is the condensate demineralizer 1 according to the first embodiment, and here, illustration of an ion exchange resin regeneration facility and a chemical supply facility is omitted.

  The condensate demineralization apparatus 1 according to Embodiment 1 includes a plurality of demineralization towers (A) 2a and demineralization towers (a deionization tower (a cation resin) and an anion exchange resin (anion resin) packed together. B) 2b, Desalting tower (C) 2c, Desalting tower (D) 2d and Desalting tower (E) 2e are installed, These desalting towers (A) 2a to Desalting tower (E) 2e Has a water supply path and an outlet path for two units, unit 1 and unit 2, so that they can be used as equipment common to two turbine cycles.

That is, demineralizer each passing water inlet portion (A). 2a-demineralizer (E) 2e, a water supply pipe 4 branched from the water supply mains 3 in ₁ unit 1 system connected to the first turbine cycle _{1 a~4 1} e is connected, similarly, the water supply pipe _{4 2} a~4 2 e is communicated branched from the water supply main pipe _{3 2} units 2 system connected to the second turbine cycle. Then, the water supply pipe ₄ 1 A～4 ₁ each of the intermediate portion demineralizer inlet valve of e _{5 1} a~5 1 e of unit 1 system is provided, similarly, the water supply pipe ₄ 2 a to the unit 2 based Desalting tower inlet valves 5 _{2 a to} 5 ₂ e are also provided in the middle part of 4 ₂ e, respectively.

Here, water mains _{3 1} and the water supply pipe ₄ 1 A～4 pipe path consisting of ₁ e branching therefrom, water mains _{3 2} and the water supply pipe ₄ 2 A～4 ₂ pipe path including the e respectively this from branched This is the water supply route described above.

On the other hand, at each water outlet of each of the desalting tower (A) 2a to the desalting tower (E) 2e, the outlet pipes 7 _{1 a to} 7 ₁ e of the unit ₁ system and the outlet pipe 7 _{2 a of the} unit 2 system are used. 7 ₂ e are connected to each other. The outlet pipe _{7 1 a~7} 1 e of unit 1 system is connected to a first turbine cycle merges with the outlet main pipe _61, similarly unit 2 system outlet pipe _{7 2 a~7} 2 e is is adapted to be connected to the second turbine cycle merges with the outlet main pipe 6 _2. Furthermore, the outlet pipe _{7 1 a~7 1 e, 7 2} a~7 2 e each intermediate portion and each demineralizer outlet valve ₈ 1 _a~8 1 _e of, 8 ₂ a~8 2 e is provided Yes.

Here, consists outlet main pipe _{6 first} pipe path consisting of the outlet pipe _{7 1 a~7} 1 e communicated thereto, an outlet pipe communicating with this outlet main pipe _{6 2 7 2 a~7} and ₂ e Each of the piping lines is the above-described outlet path.

  In addition, it is possible to measure both cations (anions) and anions (anions) contained in the condensate at the water outlet of each of the desalting towers (A) 2a to (E) 2e. Each outlet water quality measuring instrument 9a-9e is installed.

On the other hand, between the water mains 3 ₁ and the outlet main pipe ₆₁ of the unit 1 system, the bypass pipe 11 ₁ provided with a bypass pipe flow regulating valve 10 ₁ is connected, likewise water of the unit 2 system bypass pipe 11 ₂ having a bypass pipe flow regulating valve 10 ₂ is connected between the main pipe 3 ₂ and the outlet main pipe 6 _2.

12 ₁ is a unit inlet water quality measuring device that continuously monitors the quality of water (condensate) flowing into the water main 3 ₁ of unit 1 system, likewise 12 ₂ flows into the water main 3 ₂ units 2 based It is a unit entrance water quality measuring instrument that constantly monitors the quality of water (condensate). These units inlet water quality measuring instrument 12 ₁ and 12 ₂ measures the contaminants such as metal oxides.

Reference numeral 13 denotes a control device that inputs measurement values measured by the unit inlet water quality measuring instruments 12 ₁ and 12 ₂ and the outlet water quality measuring instruments 9a to 9e and outputs an opening command or a closing command to the corresponding valves. The control device 13, demineralizer inlet valve ₅ 1 _a~5 1 e, demineralizer outlet valve _{8 2 a~8} 2 e and the bypass pipe flow control valve ₁₀ 1, 10 ₂ of the set values for opening and closing Are set as shown in FIGS. 2A and 2B, for example.

Hereinafter, the response of the control device 13 will be described with reference to FIGS. 2 (a) and 2 (b).
In FIG. 2A, the control device 13 inputs measurement values measured by the unit inlet water quality measuring instruments 12 ₁ , 12 ₂ , and when the input value is equal to or higher than a set level Lα, the bypass pipe flow rate control valve 10 ₁ , 10 ₂ is fully opened, and a command to fully close the desalting tower inlet valves 5 _{1 a to} 5 ₁ e and the desalting tower outlet valves 8 _{2 a to} 8 ₂ e is output. When the input values from the unit inlet water quality measuring instruments 12 ₁ and 12 ₂ are less than the set level Lβ (Lα> Lβ), the desalting tower inlet valves 5 ₁ a to 5 ₁ e and 5 ₂ a to 5 ₂ e and demineralizer outlet valve _{8 1 a~8 1 e, 8 2} a~8 a ₂ e controls the opening of the bypass pipe flow control valve ₁₀ 1, 10 ₂ in a state that is fully closed.

In addition, when the measurement value measured by the unit inlet water quality measuring instruments 12 ₁ and 12 ₂ is in the hatching region between the setting levels Lα to Lβ, the control device 13 sets all the bypass pipe flow rate control valves 10 ₁ and 10 ₂ to while closed, and fully opening the demineralizer inlet valve _{5 1 a~5 1 e, 5 2} a~5 2 e and demineralizer outlet valve _{8 1 a~8 1 e, 8 2} a~8 2 e Control is performed so that water (condensate) flows through the desalting tower (A) 2a to the desalting tower (E) 2e.

  The outlet water quality measuring instruments 9a to 9e measure the water discharged from the water outlet portions of the desalting tower (A) 2a to the desalting tower (E) 2e and input the measured water to the control device 13.

In addition to the setting levels Lα and Lβ shown in FIG. 2A, the control device 13 also sets the setting level Lγ shown in FIG. 2B (Lα>Lγ> Lβ). If the measured values input from the measuring instruments 9a to 9e are less than the set level Lγ, it is determined that the desalting process is performed, and the bypass pipe flow control valves 10 ₁ , 10 ₂ , the desalting tower inlet valve 5 ₁ a ~5 _{1 e,} 5 2 a~5 of ₂ e and demineralizer outlet valve _{8 1 a~8 1 e, 8 2} a~8 2 e, to output the circuit opening command or closing command to the corresponding valve.

Furthermore, when the measured values measured by the outlet water quality measuring instruments 9a to 9e are equal to or higher than the set level Lγ, the control device 13 determines that the ion exchange resin is in a saturated state (a state where ion exchange cannot be performed), and determines that the state is saturated. To open the desalting tower inlet valves 5 _{1 a to} 5 ₁ e and the desalting tower outlet valves 8 _{2 a to} 8 ₂ e so that the desalting towers _{2 a to 2} e are switched to the waiting desalting towers _{2 a to 2} e. Alternatively, a closing command is output.

  In FIG. 1, a valve with a black symbol is shown in a fully closed state, and an unfilled valve shows an open circuit (fully open or opening degree control). FIG. 1 shows that a unit 1 system desalting tower (A) 2a and a desalting tower (B) 2b are connected to the first turbine cycle and are in operation, and a unit 2 system desalting tower (D ) 2d and desalting tower (E) 2e are connected to the second turbine cycle and are in operation, and the remaining one desalting tower (C) 2c is in a standby state.

(Function)
Hereinafter, a case where the first turbine cycle and the second turbine cycle are operated will be described.
In general, when the power plant is started up, the concentration of impurities in the condensate system is high, and the measured values measured by the unit inlet water quality measuring instruments 12 ₁ and 12 ₂ are equal to or higher than the set value Lα in FIG. For this reason, the control device 13 outputs a fully open command to the bypass pipe flow rate adjusting valves 10 ₁ , 10 ₂ , and at the same time, the desalting tower inlet valves 4 _{1 a to} 4 ₁ e and the desalting tower outlet valves 8 _{1 a to} 8 ₁ Fully closed command is output for e. The condensate system is supplied with pure water from a supply device such as a boiler (not shown). The supplied pure water is blown (discharged) after circulating in the condensate system. In the state immediately after the start of replenishment and blow of pure water, the water quality (conductivity) of the condensate system measured by the unit inlet water quality meters 12 ₁ and 12 ₂ is a value equal to or higher than the set level Lα in FIG. It is. Then, by replenishing and blowing pure water for a while, the impurity concentration in the condensate system decreases, and the measured values measured by the unit inlet water quality meters 12 ₁ and 12 ₂ become smaller than the set level Lα and are shown by hatching. When entering the region, the control device 13 determines that the condensate demineralizer can be operated, and outputs a command to the various valves so that the valves shown in FIG. That is, a closing command is given to the bypass pipe flow rate control valves 10 ₁ , 10 ₂ , and at the same time, the desalting tower inlet valves 4 ₁ a, 4 ₁ b, 4 ₂ d, 4 ₂ e, and the desalting tower outlet valves 8 ₁ a and 8 are provided. ₁ b, 8 ₂ d and 8 ₂ e are fully opened, and water that has been bypassed to the bypass pipes 11 ₁ , 11 ₂ side is passed through the desalting towers 2 a, ₂ b, ₂ d, ₂ e until The salt towers 2a, 2b, 2d and 2e are subjected to desalting treatment.

Hereinafter, the method of desalting in the desalting towers 2a to 2e will be specifically described.
As shown in FIG. 1, when the desalting tower (A) 2a and the desalting tower (B) 2b are connected to the unit 1 system, the outlet water quality measuring instruments 9a and 9b are respectively connected to the desalting tower (A) 2a. The water quality of the condensate discharged from the desalting tower (B) 2 b is measured, and the measured value is input to the control device 13. Similarly, when the desalting tower (D) 2d and the desalting tower (E) 2e are connected to the unit 2 system, the outlet water quality measuring instruments 9d and 9e are respectively connected to the desalting tower (D) 2d and the desalting tower ( E) The quality of the condensate discharged from 2e is measured, and the measured value is input to the control device 13.

  If the measured values sent from the outlet water quality measuring instruments 9a to 9e are in the shaded area in FIG. 2B, the control device 13 opens and closes each valve so that the valve shown in FIG. A command is output to cause the desalting tower (A) 2a, the desalting tower (B) 2b, the desalting tower (D) 2d, and the desalting tower (E) 2e to perform desalting treatment. However, when the measured value measured by a certain outlet water quality measuring instrument is equal to or greater than the set value Lγ, the control device 13 determines that the ion exchange resin of the desalting tower measured by the outlet water quality measuring instrument is in a saturated state. A close command is output to the inlet and outlet valves of the desalting tower, and an opening command is output to the inlet and outlet valves of the standby desalting tower instead.

For example, when the measured value sent from the outlet water quality measuring instrument 9a of the unit 1 system becomes equal to or higher than the set value Lγ, the control device 13 causes the ion exchange resin in the desalting tower (A) 2a of the unit 1 system to be saturated. The inlet valve 5 ₁ a and the outlet valve 8 ₁ a of the desalting tower (A) 2a are closed and the inlet valve 5 ₁ c and the outlet of the desalting tower (C) 2c, which are in a standby state, are instead determined. Open valve 8 ₁ c. As a result, in the first turbine cycle, the desalting tower (C) 2c is connected instead of the desalting tower (A) 2a, and water passage is started in the desalting tower (C) 2c to perform the desalting treatment. Is called.

  During the desalting process, the desalting tower (A) 2a is connected to a regeneration facility (not shown) to regenerate the ion exchange resin. The desalting tower (A) 2a enters a standby state after the regeneration process is completed.

Thereafter, when the measured value sent from the outlet water quality measuring instrument 9e becomes equal to or higher than the set value Lγ of the control device 13, the control device 13 determines that the ion exchange resin in the desalting tower (E) 2e is saturated. The inlet valve 5 ₂ e and the outlet valve 8 ₂ e of the desalting tower (E) ₂ e are closed, and the inlet valve 5 ₂ a and the outlet valve of the unit 2 system of the desalting tower (A) 2 a that are standing by instead are closed. Open 8 ₂ a. Thereby, in place of the desalting tower (E) 2e, the desalting tower (A) 2a is connected to the second turbine cycle, water flow to the desalting tower (A) 2a is started, and the desalting treatment is performed. Done.

  During the desalting process, the desalting tower (E) 2e is connected to a regeneration facility (not shown) to regenerate the ion exchange resin filled. The desalting tower (E) 2e enters a standby state after the regeneration process is completed.

  As described above, when the ion exchange resin filled in the operating desalting tower reaches the saturation level, the control device 13 determines and automatically connects to the waiting desalting tower, which is necessary for the boiler. Continue operation to ensure water quality.

When the control device 13 detects that the water quality in the condensate system has reached an arbitrary value below the set level Lβ in FIG. 2 based on the measured values of the unit inlet water quality meters 12 ₁ and 12 ₂ , the unit inlet water quality meter 12 ₁ and 12 ₂ , the bypass pipe flow control valves 10 ₁ and 10 ₂ are opened to bypass a part of the condensate to the bypass pipes 11 ₁ and 11 ₂ and the inlet valves 5 _{1 a to} 5 ₂ e. Are closed and the outlet valves 8 _{1 a to} 8 ₂ e connected in series therewith. That is, when the water quality of the condensate system is improved, there is no need to perform desalting treatment. Therefore, the related valves are opened and closed to reduce the number of desalting towers (A) 2a to (E) 2e through which water passes. To do. Thus, when the water quality of the condensate system is improved, the ion exchange resins filled in the desalting towers 2a to 2e are saturated by reducing the number of operating desalting towers (A) 2a to (E) 2e. The time to perform can be extended, and the continuous operation time of the desalination facility can be extended.

  In the above description, the ion exchange resin in the desalting tower has been saturated so that it can be switched to the standby desalting tower, but there are cases where the desalting tower becomes unusable due to failure or the like. Similarly, it can be switched to a standby demineralization tower.

(effect)
As described above, according to the first embodiment, since a plurality of demineralization towers are configured as a common facility for a plurality of turbine cycles, the overall facility can be reduced in size and installed space compared to this type of conventional apparatus. It is possible to reduce the size, and as a result, it is possible to reduce the initial cost of the power plant. In addition, since the number of installed desalting towers can be reduced as compared with the conventional apparatus, it is possible to increase the operating rate of the desalination equipment. Furthermore, by reducing the number of desalting towers, it is possible to reduce the amount of chemicals used for pH adjustment, the amount of chemicals necessary for the regeneration of ion exchange resins, and the frequency of resin exchange, and the running of the desalting equipment. Cost can be reduced.

(Embodiment 2)
Hereinafter, Embodiment 2 of the condensate demineralization system according to the present invention will be described with reference to FIG. FIG. 3 is a schematic system diagram of a condensate demineralizer showing Embodiment 2 of the present invention.

(Constitution)
In this Embodiment 2, instead of packing a cation resin and an anion resin into one desalting tower as in Embodiment 1, a cation desalting tower in which only a cation resin is packed in a desalting tower, and only an anion resin are used. It is characterized by being separated into a packed anion desalting tower.

  In FIG. 3, the present embodiment 2 is different from the desalting tower (A) 2a to the desalting tower (E) 2e of FIG. 1 in that the cation desalting tower (A) 20a to the cation desalting tower (E ) 20e and an anion desalting tower (A) 30a to an anion desalting tower (E) 30e filled with only an anion resin.

  And in connection with having made the desalination tower into another tower structure, while providing the outlet water quality measuring instruments 31a-31e of the anion desalting tower instead of the above-mentioned outlet water quality measuring instruments 9a-9e, the cation desalting tower (A) The outlet water quality measuring instruments 21a to 21e of the cation desalting tower are provided at the water outlet of the 20a to cation desalting tower (E) 20e.

  Furthermore, cation desalting tower bypass valves 22a to 22e are provided for the cation desalting tower (A) 20a to the cation desalting tower (E) 20e, respectively, and the anion desalting tower (A) 30a to the anion desalting tower (E ) Anion demineralization tower bypass valves 32a to 32e are provided for 30e. Furthermore, anion desalting tower inlet valves 33a to 33e are provided for the anion desalting tower (A) 30a to the anion desalting tower (E) 30e, respectively. Others are the same as those in the first embodiment, and the description is omitted.

  FIG. 3 shows a state where both the first turbine cycle and the second turbine cycle are operating as in FIG. As for the cation demineralization tower, two units of the cation demineralization tower (A) 20a and the cation demineralization tower (B) 20b are used in the unit 1 system, and the cation demineralization tower (D) 20d and the cation demineralization tower are used in the unit 2 system. A state in which two salt towers (E) 20e are used and the remaining one cation demineralizer (C) 20c is on standby.

  As for the anion desalting tower, in the unit 1 system, an anion desalting tower (A) 30a connected in series to the cation desalting tower (A) 20a and an anion connected in series to the cation desalting tower (B) 20b. In the unit 2 system, an anion desalting tower (D) 30d connected in series to a cation desalting tower (D) 20d and a cation desalting tower (E) 20e are used. The two anion demineralization towers (E) 30e connected in series are used, and the remaining one anion demineralization tower (C) 30c is on standby.

(Function)
As described in the first embodiment, when the power plant is started up, the concentration of impurities in the condensate system is high, and the measured values measured by the unit inlet water quality measuring devices 12 ₁ and 12 ₂ are equal to or higher than the set value Lα. controller 13 outputs a full open command to the first embodiment similarly bypass pipe flow control valve 10 ₁ and 10 _2, demineralizer inlet valve _{4 1 a~4 1 e, 4 2} a~4 2 e and desalting A full-close command is output to the tower outlet valves 8 ₁ a to 8 ₁ e and 8 ₂ a to 8 ₂ e.

By continuing to blow for a while while supplying pure water, the concentration of impurities in the condensate system decreases, and the measured value measured by the unit inlet water quality meters 12 ₁ and 12 ₂ becomes less than the set level Lα in FIG. Then, the control device 13 determines that the condensate demineralizer can be operated, and outputs a command to the various valves so that the valves shown in FIG. That is, a closing command is given to the bypass pipe flow control valves 10 ₁ , 10 ₂ , and at the same time, the desalting tower inlet valves 4 ₁ a, 4 ₁ b, 4 ₂ d, 4 ₂ e, and the desalting tower outlet valves 8 ₁ a, 8 ₁ b, 8 ₂ d, 8 ₂ e is given a full opening command, and a newly provided anion demineralization tower inlet valve 33 a, 33 b, 33 d, 33 e is given a full opening command, and cation demineralization tower bypass valves 22 a to 22 e. The fully closed command is also given to the anion desalting tower inlet valves 33a to 33e.

As a result, the condensate that has been flowing to the bypass pipes 11 ₁ and 11 ₂ side until now is a series piping line of the cation demineralizer (A) 20a and the anion demineralizer (A) 30a, the cation demineralizer (B). 20b and anion desalting tower (B) 30b in series piping, cation desalting tower (D) 20d and anion desalting tower (D) 30d in series piping, cation desalting tower (E) 20e and anion desalting tower (E) It flows to the serial piping line of 30e, and each desalting tower performs a desalting process.

For example, when the water quality measured by the outlet water quality measuring instrument 21a becomes equal to or higher than the set value Lγ during the operation of the desalting tower, the control device 13 saturates the cation exchange resin in the cation desalting tower (A) 20a. The inlet valve 5 ₁ a and the outlet valve 8 ₁ a of the cation demineralizer (A) 20a are closed and the inlet valve 5 ₁ c of the cation demineralizer (C) 20c, which has been in a standby state, is determined instead. The three valves of the inlet valve 33c and the outlet valve 8 ₁ c of the anion desalting tower (C) 33c are opened. Thereby, instead of the cation desalting tower (A) 20a and the anion desalting tower (A) 30a, the cation desalting tower (C) 20c and the anion desalting tower (C) 30c are connected to the first turbine cycle. Then, water flow is started and desalting treatment is performed.

  In parallel with this, the cation desalting tower (A) 20a is connected to a regenerating facility (not shown) to regenerate the cation exchange resin filled inside. At this time, since the anion desalting tower (A) 30a is not saturated, the regeneration treatment is not performed. After the regeneration treatment of the cation desalting tower (A) 20a is completed, the cation desalting tower (A) 20a and the anion desalting tower (A) 30a are in a standby state.

Thereafter, when the measured value sent from the outlet water quality measuring instrument 21e becomes equal to or higher than the set value Lγ of the control device 13, the control device 13 determines that the cation exchange resin in the cation demineralizer (E) 20e is saturated. The cation desalting tower (E) 20e side inlet valve 5 ₂ e and the anion desalting tower (A) 30a side outlet valve 8 ₂ e are closed, and the cation desalting tower (A) in standby instead. The inlet valve 5 ₂ a and the outlet valve 8 ₂ a of the unit 2 system 20a are opened. Thereby, the cation desalting tower (A) 20a and the anion desalting tower (A) 30a are connected to the second turbine cycle instead of the cation desalting tower (E) 20e and the anion desalting tower (E) 30e. Then, water passage to the cation desalting tower (A) 20a and the anion desalting tower (A) 30a is started to perform desalting treatment.

  In parallel with this, the cation desalting tower (E) 20e is reconnected to the regenerative facility (not shown) to regenerate the ion exchange resin filled. After the regeneration treatment of the cation desalting tower (E) 20e is completed, the cation desalting tower (E) 20e and the anion desalting tower (E) 30e are in a standby state.

  The above description is for the case where the cation resin in the cation desalting tower is saturated, but also in the case where the anion resin is saturated, each valve is opened and closed in accordance with a command from the control device 13, and the cation desalination in standby is performed. Switch to tower and anion desalting tower.

  As described above, when the ion exchange resin filled in the operating desalting tower reaches the saturation level, the control device 13 determines and automatically connects to the waiting desalting tower, which is necessary for the boiler. Continue operation to ensure water quality.

Incidentally, the cation demineralizer 20a~20e and water in the condensate system by desalting anion demineralizer 30a~30e is purified, the unit that was below the set level Lβ in FIG inlet water quality meter ₁₂ 1, When measured at 12 _2, from the fully closed state by the control unit 13 in accordance with the measurement result with respect to cation demineralizer bypass valve 22a~22e or anion demineralizer bypass valve 32a~32e to the appropriate valve opening An opening degree command is issued, and the amount of water flowing to the cation desalting tower (A) 20a to the cation desalting tower (E) 20e or the amount of water flowing to the anion desalting tower (A) 30a to the anion desalting tower (E) 30e Thus, the lifetime of the desalting towers 2a to 2e can be extended. Instead of outputting a command for adjusting the valve opening degree of the bypass pipe flow control valve 10 ₁ and 10 ₂ from the controller 13 to control the number of demineralization tower for passing water by opening and closing the valve, the demineralizer It is also possible to extend the operation time of the desalination equipment by minimizing the amount of water flow.

  In the above description, the ion exchange resin in the desalting tower is saturated and switched to the standby desalting tower. However, as in the first embodiment, the desalting tower is broken or the like. Even when it becomes unusable, it can be switched and connected to the demineralization tower on standby.

(effect)
Even in the case where the desalting tower is configured as separate towers in the cation desalting towers 20a to 20e and the anion desalting towers 30a to 30e as in the second embodiment, a plurality of turbine cycles are provided as in the first embodiment. In contrast, the condensate demineralizer can be used as a common facility. In addition, each impurity concentration is constantly monitored at the inlet of each demineralization tower, and by opening / closing the cation demineralization tower bypass valve or the anion demineralization tower bypass valve according to the result, only the cation resin demineralization tower, or Only the anion resin desalting tower is allowed to pass through, so that it is possible to extend the operating time of each.

(Effects common to the embodiments)
According to the embodiment of the present invention, the condensate demineralization equipment is used as a common equipment in a plurality of turbine cycles, so that the equipment can be downsized and the installation space can be reduced as compared with this type of conventional apparatus. This can reduce the initial cost of the power plant.

  As mentioned above, although several embodiment of this invention was described, these embodiment was shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Condensate demineralizer, 2a-2e ... Desalination tower (AE), 3 ₁ ... Unit 1 system water supply main, 3 ₂ ... Unit 2 system water supply main, 4 ₁ a-4 ₁ e ... unit 1 based demineralizer feed water _pipe, 4 _{2 a~4} 2 e ... unit 2 based demineralizer feed water _pipe, 5 _{1 a~5} 1 e ... unit 1 based demineralizer inlet _{valve, 5} 2 a 5 ₂ e ... Unit 2 system demineralization tower inlet valve, 6 ₁ ... Unit 1 system outlet main pipe, 6 ₂ ... Unit 2 system outlet main pipe, 7 ₁ a to 7 ₁ e ... Unit 1 system outlet main pipe _tube, 7 _{2 a~7} 2 e ... unit 2 system outlet _pipe, 8 ₁ a~8 1 e ... unit 1 based demineralizer outlet _valve, demineralizer of 8 ₂ a~8 2 e ... unit 2 system Outlet valve, 9a to 9e ... Outlet water quality measuring instrument, 10 ₁ ... Unit 1 system bypass pipe flow rate control valve, 10 ₂ ... Unit 2 system bypass pipe flow rate control valve, 11 ₁ ... Knit 1 system bypass pipe, 11 ₂ ... Unit 2 system bypass pipe, 12 ₁ ... Unit 1 system inlet water quality measuring instrument, 12 ₂ ... Unit 2 system inlet water quality measuring instrument, 13 ... Control device, 20a to 20e ... Cation Desalting towers (A) to (E), 21a to 21e ... Cationic desalting tower outlet water quality measuring instruments, 22a to 22e ... Cationic desalting tower bypass valve, 30a to 30e ... Anion desalting towers (A) to (E) 31a-31e ... anion demineralization tower outlet water quality measuring instrument, 32a-32e ... anion demineralization tower bypass valve, 33a-33e ... anion demineralization tower inlet valve.

Claims (7)

A plurality of demineralization towers filled with ion exchange resin;
A water supply path connected to the condensate system of the turbine cycle of the power plant and supplying condensate from the condensate system to the demineralizer;
An outlet path for returning the condensate discharged from the desalting tower to the condensate system of the turbine cycle;
A demineralization tower inlet valve provided in the water supply path;
A demineralization tower outlet valve provided in the outlet path;
In the condensate demineralizer for removing impurity ions contained in the condensate with the demineralizer,
A condensate demineralizer comprising a plurality of the turbine cycles, wherein the water supply path and the outlet path of each turbine cycle are connected to each demineralization tower. A water quality measuring instrument for measuring the quality of condensate in the water supply path or the water supply path is provided,
When the measured value input from the water quality measuring instrument is equal to or greater than a predetermined set value, it is determined that the ion exchange resin is saturated, the demineralizer inlet valve and the demineralizer outlet valve are opened and closed, and the condensate is The condensate demineralizer according to claim 1, further comprising a control device for automatically switching the desalting tower to be supplied from an operating desalting tower to a waiting desalting tower.   The demineralization tower is provided with a bypass pipe, and a unit inlet water quality measurement instrument that constantly monitors the water quality at the inlet of the demineralization tower is provided, and the control device has preset measurement values of the unit inlet water quality measurement instrument. 2. When outside the predetermined range, a part of condensate is passed through the bypass pipe to bypass the desalting tower, and the number of the desalting towers passing through is controlled. Condensate demineralizer.   The condensate demineralizer according to claim 1, wherein the desalting tower is filled with a cationic resin and an anionic resin together.   The condensate demineralization tower according to claim 1, wherein the demineralization tower is provided with a cation demineralization tower and an anion demineralization tower by separating and packing an ion exchange resin into a cation resin and an anion resin. Salt equipment.   A bypass pipe is provided in the cation desalting tower and the anion desalting tower, and a unit inlet water quality measuring instrument for constantly monitoring the water quality at the inlet of the cation desalting tower and the anion desalting tower is provided. Cationic desalting tower or anion desalting that bypasses the cation desalting tower or anion desalting tower individually and passes water when the measured value of the inlet water quality measuring instrument is lower than the preset level. 6. The condensate demineralizer according to claim 5, wherein the number of towers is controlled.   A condensate demineralization method, wherein impurity ions contained in condensate of a turbine cycle are removed by the demineralization tower using the condensate demineralization apparatus according to any one of claims 1 to 6.

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