JP2017032224A - Heated water manufacturing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heated water manufacturing system for manufacturing heated water from treated water by performing heat exchange between treated water obtained in a water treatment system and steam obtained in a boiler system, which improves energy efficiency in the water treatment system and the boiler system.SOLUTION: A second system control unit 45 of a boiler system 4 calculates a heat exchange amount Qs on a steam side in a heat exchanger 62 on the basis of a total value of a collected output steam amount of a steam boiler 42. A first system control unit 25 of a water treatment system 2 calculates a heat exchange amount Qw on a treated water side in the heat exchanger 62 from the heat exchange amount Qs on a steam side calculated by the second system control unit 45, determines a flow rate of treated water W2 that can heat the treated water W2 passing through the heat exchanger 62 to a target temperature on the basis of the heat exchange amount Qw on a treated water side, and designates a divided flow rate obtained by dividing the flow rate of the treated water W2 by the number of water treatment devices in a water treatment device group 21 as a target flow rate value to a first local control unit 35.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heated water production system for producing heated water by heating treated water obtained by a water treatment system.

  Heating treated water (pure water) obtained by a water treatment system such as a pure water production apparatus is performed to produce warm water (for example, see Patent Documents 1 and 2 below). As a heat source for heating the treated water, steam produced in a boiler (boiler system) is used, and heated water is produced by heat exchange between the treated water and the steam in a heat exchanger. In a general heat exchange system using steam as a heat source, the temperature of the fluid to be heated after passing through the heat exchanger is detected, and the amount of steam to the heat exchanger is adjusted so that this detected value becomes the set value. It is controlled by the opening of the valve (see, for example, Patent Documents 3 and 4 below).

  In the systems of Patent Documents 3 and 4, since the amount of steam is adjusted following the temperature of the fluid to be heated after passing through the heat exchanger, the combustion rate of the boiler and the number of combustion units are changed according to fluctuations in the required amount of steam. Will also change. For this reason, the heat dissipation loss of the entire boiler system due to switching and starting / stopping of the combustion rate of the boiler was relatively large. Moreover, in the conventional water treatment system, the flow rate of treated water was not constant throughout the year due to the viscosity coefficient of water changing with temperature. For this reason, when the temperature of the supply water rises in the summer, the discharge flow rate of the feed water pump becomes excessive and wasteful power consumption occurs. Under such circumstances, it is desired to improve the energy efficiency in the water treatment system and the boiler system.

JP 63-189796 A (FIG. 2) JP2013-202581A (FIG. 2) JP 58-164999 A (FIG. 3) JP 2000-161084 A (FIG. 1)

  Accordingly, the present invention provides a water treatment system and a boiler in a heated water production system for producing heated water from treated water by exchanging heat between treated water obtained by the water treatment system and steam obtained by the boiler system. The aim is to improve energy efficiency in the system.

  The present invention is a water treatment system comprising a water treatment device group composed of one or more water treatment devices, and a first system control unit that specifies a target flow rate value of treated water produced by the water treatment device, A boiler system comprising a steam boiler group composed of one or more steam boilers, and a second system control unit that collects an output steam amount of the steam boiler, a heated water tank for storing heated water, and the water treatment system A heated water line through which the treated water produced in the flow circulates toward the heated water tank, a steam line through which the steam produced in the boiler system circulates, a treated water through the heated water line, and the steam line. A heat exchanger that exchanges heat with the circulating steam and heats the treated water to a predetermined temperature to obtain heated water, and the water treatment device obtains treated water from the supplied water. And entered A pump that is driven at a rotational speed according to the dynamic frequency, sucks the supplied water and discharges it toward the water treatment unit, an inverter that outputs a drive frequency corresponding to the input frequency setting signal to the pump, and processing The drive frequency of the pump is calculated using the physical quantity in the system so that the water production flow rate becomes the target flow rate value designated by the first system control unit, and the frequency setting corresponding to the calculated value of the drive frequency A first local control unit that outputs a signal to the inverter, and the steam boiler includes a boiler body in which combustion is performed, and a second local control unit that burns the boiler body at a preset predetermined combustion rate. The second system control unit calculates a heat exchange amount Qs on the steam side in the heat exchanger based on the collected total output steam amount of the steam boiler, The 1 system control unit calculates the heat exchange amount Qw on the treated water side in the heat exchanger from the heat exchange amount Qs on the steam side calculated by the second system control unit, and the heat exchange amount Qw on the treated water side The flow rate of the treated water that can heat the treated water passing through the heat exchanger to a predetermined target temperature is determined, and the divided flow rate obtained by dividing the flow rate of the treated water by the number of the water treatment device groups Is specified as the target flow rate value for the first local control unit.

  In addition, the second local control unit may be an eco operation point that is the combustion rate at which the boiler efficiency is the highest as the predetermined combustion rate, or a combustion rate in an eco operation zone that is a range of the combustion rate including the eco operation point. It is preferable to burn the boiler body.

  The steam boiler is an economizer that preheats boiler feedwater with the heat of the exhaust gas through the exhaust gas from the boiler body, and a temperature at which the feed water temperature is measured before or after being passed through the economizer It is preferable that the second local control unit sets the eco driving point or the eco driving zone based on a measured value of the temperature sensor.

  Moreover, it is preferable that the said steam boiler is comprised as a step value control boiler which changes a combustion rate in steps, and the said 2nd local control part burns the said boiler main body with the combustion rate of the said eco-operation point.

  Moreover, it is preferable that the said steam boiler is comprised as a proportional control boiler which changes a combustion rate continuously, and the said 2nd local control part burns the said boiler main body with the combustion rate of the said eco-operation zone.

  In addition, a water level sensor that detects the water level of the warmed water stored in the warming water tank, the first system control unit (i) when the detected water level value of the water level sensor is below the lower limit set water level, When the maximum production flow rate of treated water that can be produced by the water treatment device is designated as the target flow rate value for the first local control unit, while the detected water level value of the water level sensor exceeds the upper limit set water level A minimum production flow rate of treated water that can be produced by the water treatment device is designated as the target flow rate value for the first local control unit, and (ii) the target designated for the first local control unit Based on the flow rate obtained by multiplying the flow rate value by the number of the water treatment device groups, the heat exchange amount Qw on the treated water side required to heat the treated water passing through the heat exchanger to a predetermined target temperature is calculated. Calculated and said (I) When the detected water level value of the water level sensor is lower than the lower limit set water level or higher than the upper limit set water level, the second system control unit is configured to cancel the combustion control at the predetermined combustion rate. A predetermined combustion rate operation cancellation signal is transmitted to the control unit, and (ii) the steam-side heat exchange amount Qs in the heat exchanger is calculated from the treated water-side heat exchange amount Qw calculated by the first system control unit. And determining the necessary steam amount for obtaining the heat exchange amount Qs on the steam side, and dividing the necessary steam amount by the number of the steam boiler groups at a combustion rate that becomes the output steam amount. It is preferable to transmit a combustion rate designation signal to the second local control unit so as to burn the fuel.

  In addition, the water treatment unit includes a reverse osmosis membrane module that separates supply water into permeate and first concentrated water, and electricity that desalinates permeate with electric power to produce treated water and second concentrated water. A deionizing stack.

  Further, the apparatus further comprises a steam trap provided in the steam line downstream of the heat exchanger, and mixes the steam condensed water separated by the steam trap with the supply water to the water treatment unit, thereby supplying the supply water. It is preferable to dilute and raise the temperature.

  ADVANTAGE OF THE INVENTION According to this invention, in the heating water manufacturing system which heat-exchanges between the treated water obtained with a water treatment system, and the steam obtained with a boiler system, and manufactures heated water from a treated water, a water treatment system and a boiler Energy efficiency in the system can be improved.

1 is an overall schematic diagram of a heated water production system 1 according to an embodiment of the present invention. It is the schematic which shows mainly the water treatment system 2 about the warming water manufacturing system 1 which concerns on this embodiment. It is the schematic which shows the boiler system 4 centering | focusing on the heated water manufacturing system 1 which concerns on this embodiment. It is explanatory drawing which shows the relationship between the water level of the warming water tank 61, and the target flow value of the water treatment apparatus 22, and the relationship between the water level of the heating water tank 61 and the combustion rate of the steam boiler 42. It is a flowchart which shows the process sequence in the case of performing flow volume feedback water volume control in the water treatment apparatus 22. It is a flowchart which shows the process sequence in the case of performing voltage value control of the DC power supply device 34 in the water treatment apparatus 22. 4 is a flowchart showing a procedure for specifying a target flow rate value by the first system control unit 25. 6 is a flowchart showing a combustion rate switching procedure by a second system control unit 45.

Hereinafter, an embodiment of a heated water production system according to the present invention will be described with reference to the drawings. FIG. 1 is an overall schematic diagram of a heated water production system 1 according to an embodiment of the present invention. FIG. 2 is a schematic diagram centering on the water treatment system 2 for the heated water production system 1 according to the present embodiment. FIG. 3 is a schematic diagram centering on the boiler system 4 of the heated water production system 1 according to the present embodiment.
The present invention performs heating exchange between the treated water W2 obtained in the water treatment system 2 and the steam SM1 obtained in the boiler system 4, and heats the treated water W2 to produce heated water W3. System 1.

  In detail, as shown in FIGS. 1-3, the warming water manufacturing system 1 of this embodiment is the water treatment system 2, the boiler system 4, the warming water tank 61 which stores the warming water W3, and water treatment. The heated water line L6 through which the treated water W2 produced by the system 2 flows toward the heated water tank 61, the steam line L4 through which the steam SM1 produced by the boiler system 4 flows, and the treated water W2 at a predetermined temperature. Heat exchanger 62 for heating to obtain heated water W3, room temperature water tank 65 for storing treated water W2, and treated water W2 produced by water treatment system 2 are directed toward room temperature water tank 65 without being heated. And a room temperature water line L32 that circulates.

  The water treatment system 2 includes a water treatment device group 21 including one or more water treatment devices 22 and a first system control unit 25 that designates a target flow rate value of the treated water W2 produced by the water treatment device 22. Prepare. The boiler system 4 includes a steam boiler group 41 including one or more steam boilers 42, and a second system control unit 45 that collects the output steam amount of the steam boiler 42. The heat exchanger 62 performs heat exchange between the treated water W2 flowing through the heated water line L6 and the steam SM1 flowing through the steam line L4, and heats the treated water W2 to a predetermined temperature.

[Water treatment system 2]
The water treatment system 2 will be described. As shown in FIGS. 1 and 2, the water treatment system 2 includes a water treatment device group 21 and a first system control unit 25.
The water treatment device group 21 includes one or more water treatment devices 22, and in the present embodiment, includes four sets of water treatment devices 22. In the present embodiment, the water treatment device 22 is a pure water production device that produces demineralized water W2 as treated water from raw water (for example, tap water) W1 as supply water. The desalinated water W2 produced by the water treatment device 22 is sent to a demand location or the like.

  As shown in FIG. 2, the water treatment device 22 includes an RO membrane module (reverse osmosis membrane module) 32 as the water treatment unit 31, an EDI stack (electric deionization stack) 33 as the water treatment unit 31, and a DC power source. The apparatus 34, the pressurization pump 36, the inverter 37, and the 1st local control part 35 are provided.

  The water treatment device 22 includes a supply water line L1, a permeate water line L21, an RO concentrated water return line L22, an RO concentrated water discharge line L23, a desalted water line L24, and an EDI concentrated water line L25. The permeated water line L21 and the desalted water line L24 are also collectively referred to as “treated water line L2”. The “line” in the present specification is a general term for lines capable of flowing a fluid such as a flow path, a radial path, and a pipeline.

  The water treatment device 22 includes a pressure reducing valve V11, a supply water supply valve V21, a return control valve V22, a drainage control valve V23, a first flow rate sensor FM1, and a second flow rate sensor FM2.

  The first local control unit 35 is electrically connected to the inverter 37, the DC power supply device 34, the supply water supply valve V21, the return control valve V22, the drainage control valve V23, the first flow sensor FM1, the second flow sensor FM2, and the like. The

  As shown in FIGS. 1 and 2, the supply water line L <b> 1 is a line that distributes the supply water W <b> 1 to the RO membrane module 32 of the water treatment unit 31 of the water treatment device 22. The upstream end of the supply water line L1 is connected to a supply source (not shown) of the supply water W1. The downstream end of the supply water line L1 is connected to the primary inlet port (inlet for the supply water W1) of the RO membrane module 32.

In the supply water line L1, a connection portion J1, a pressure reducing valve V11, a supply water supply valve V21, a connection portion J11, a pressurizing pump 36, and an RO membrane module 32 are provided in this order from the upstream side.
The supply water supply valve V21 is an automatic valve that can control the opening and closing of the supply water line L1. The opening and closing of the supply water replenishing valve V21 is controlled by a flow path opening / closing signal transmitted from the first local control unit 35.

  The pressure reducing valve V11 is a device that adjusts the pressure of the supply water W1 supplied to the RO membrane module 32 to a pressure lower than the pressure of the first concentrated water W11 flowing out of the RO membrane module 32. The pressure reducing valve V11 adjusts the pressure of the supply water W1 so that the pressure of the first concentrated water W11 is larger than the pressure of the supply water W1 (pressure of the supply water W1 <pressure of the first concentrated water W11). Thereby, a part W12 of the first concentrated water W11 is circulated to the supply water W1 via the RO concentrated water return line L22. Therefore, the supply water W1 is supplied to the RO membrane module 32 in a state where the first concentrated water W11 is mixed. That is, in the RO membrane module 32, a cross-flow type separation operation for producing the permeated water W21 is performed while the supply water W1 is circulated by the pressure pump 36.

  The downstream end of the RO concentrated water return line L22 is connected to the connecting part J11.

  The pressurization pump 36 is a device that sucks the supply water W1 flowing through the supply water line L1 and pumps (discharges) the supply water W1 toward the RO membrane module 32. The driving power whose frequency is converted is input to the pressurizing pump 36 from the inverter 37. The pressurizing pump 36 is driven at a rotational speed corresponding to the frequency of the input driving power (hereinafter also referred to as “driving frequency”).

  The inverter 37 is an electric circuit (or a device having the circuit) that supplies driving power whose frequency is converted to the pressure pump 36. A frequency setting signal is input to the inverter 37 from the first local control unit 35. The inverter 37 supplies driving power having a driving frequency corresponding to a frequency setting signal (for example, a current value signal of 4 to 20 mA or a voltage value signal of 0 to 10 V) input by the first local control unit 35 to the pressurizing pump 36. Output to.

  The RO membrane module 32 separates the supply water W1 pumped by the pressurizing pump 36 into a permeated water W21 from which dissolved salts have been removed and a first concentrated water W11 from which dissolved salts have been concentrated. The RO membrane module 32 is configured by accommodating a single or a plurality of spiral RO membrane elements in a pressure vessel (vessel). Examples of the RO membrane used in the RO membrane element include a crosslinked aromatic polyamide composite membrane.

  The RO concentrated water return line L22 is a line for returning a part (circulated concentrated water) W12 of the first concentrated water W11 separated by the RO membrane module 32 to the supply water line L1. The upstream end of the RO concentrated water return line L22 is connected to the primary outlet port (the outlet of the first concentrated water W11) of the RO membrane module 32. The downstream end of the RO concentrated water return line L22 is connected to the supply water line L1 at the connection J11. A return control valve V22 is provided in the RO concentrated water return line L22.

  The return control valve V22 is a proportional control valve that adjusts the flow rate (circulation flow rate) of the first concentrated water W11 (circulated concentrated water W12) returned to the RO concentrated water return line L22. The opening degree of the return control valve V22 is controlled by a drive signal transmitted from the first local control unit 35. The circulation flow rate of the first concentrated water W11 can be adjusted by transmitting a current value signal from the first local control unit 35 to the return control valve V22 and controlling the valve opening degree. By this adjustment, the circulation ratio of the first concentrated water W11 can be kept at a preset value. The circulation ratio of the first concentrated water W11 is the ratio between the flow rate of the permeated water W21 flowing out from the secondary side port of the RO membrane module and the flow rate of the first concentrated water W11 flowing out from the primary side outlet port (first The flow rate of the concentrated water W11 / the flow rate of the permeated water W21).

  In the RO concentrated water return line L22, instead of providing the return control valve V22, a constant flow valve may be provided upstream of the connecting portion J21 (that is, in the vicinity of the primary outlet port of the RO membrane module 32). By configuring in this way, the circulation ratio of the first concentrated water W11 can be maintained at a preset value without depending on electrical adjustment.

  The RO concentrated water discharge line L23 is a line for discharging the remaining portion (discharged water) W13 of the first concentrated water W11 separated by the RO membrane module 32 from the middle of the RO concentrated water return line L22 to the outside of the water treatment device 22. is there. The upstream end of the RO concentrated water discharge line L23 is connected to the connection portion J21 of the RO concentrated water return line L22. The downstream end of the RO concentrated water discharge line L23 is connected or opened to, for example, a drainage pit (not shown).

  The drainage control valve V23 is a proportional control valve that adjusts the flow rate (discharge flow rate) of the first concentrated water W11 (discharged water W13) flowing through the RO concentrated water discharge line L23. The valve opening degree of the drainage control valve V <b> 23 is controlled by a drive signal transmitted from the first local control unit 35. By sending a current value signal from the first local control unit 35 to the drainage control valve V23 and controlling the valve opening, the discharge flow rate of the first concentrated water W11 can be adjusted. By this adjustment, the recovery rate of the permeated water W21 can be maintained at a preset value. The recovery rate of the permeated water W21 is the ratio of the permeated water W21 to the flow rate of the supplied water W1 supplied to the RO membrane module 32 (the supplied water W1 before the circulating concentrated water W12 of the first concentrated water W11 is mixed). Percentage (%).

  The permeated water line L <b> 21 is a line through which the permeated water W <b> 21 separated by the RO membrane module 32 flows through the EDI stack 33. The upstream end of the permeate line L21 is connected to the secondary port of the RO membrane module 32 (the outlet of the permeate W21). The downstream end of the permeate line L21 is branched (the branch line is not shown), and the primary port of the EDI stack 33 (inlet side of the desalination chamber) and the primary of the EDI stack 33, respectively. It is connected to the side port (concentration chamber inlet side). In addition, a constant flow valve (not shown) is provided in the permeate line L21 branched toward the inlet side of the concentration chamber of the EDI stack 33 so that the second concentrated water W31 is adjusted to a constant flow rate. It has become.

  The EDI stack 33 demineralizes the permeated water W21 separated by the RO membrane module 32 (deionized treatment) to obtain demineralized water W2 (deionized water) as treated water and the second concentrated water W31. Water treatment equipment. The EDI stack 33 is electrically connected to the DC power supply device 34. A direct current voltage is applied to the EDI stack 33 from the direct current power supply device 34 as power for desalination treatment. The EDI stack 33 is energized by the DC voltage applied from the DC power supply 34 and operates.

  The DC power supply 34 applies a DC voltage between the pair of electrodes of the EDI stack 33. An applied voltage setting signal is input from the first local control unit 35 to the DC power supply 34. The DC power supply device 34 applies an EDI stack to a DC voltage having a voltage value corresponding to an applied voltage setting signal (for example, a current value signal of 4 to 20 mA or a voltage value signal of 0 to 10 V) input by the first local control unit 35. 33.

  In the EDI stack 33, a cation exchange membrane and an anion exchange membrane (not shown) are alternately arranged between a pair of electrodes. The inside of the EDI stack 33 is partitioned into a desalting chamber and a concentration chamber (including an anode chamber and a cathode chamber) by these ion exchange membranes. The desalting chamber is filled with an ion exchanger (not shown). As an ion exchanger filled in the desalting chamber, for example, an ion exchange resin or an ion exchange fiber is used.

  One end of the downstream side of the permeate line L21 is connected to the inlet side of the desalting chamber. The outlet side of the desalting chamber is connected to a desalting water line L24 through which the desalted water W2 discharged from the ions in the desalting chamber is circulated. The other branched end on the downstream side of the permeate line L21 is connected to the inlet side of the concentrating chamber. An upstream end of the EDI concentrated water line L25 through which the second concentrated water W31 in which ions are concentrated is connected to the secondary port (concentration chamber outlet side) of the EDI stack 33. The downstream end of the EDI concentrated water line L25 is connected or opened to, for example, a drainage pit (not shown).

  The permeated water W21 flowing through the permeated water line L21 flows into each of the desalting chamber and the concentration chamber. Residual ions contained in the permeated water W21 are captured by an ion exchanger (not shown) filled in the desalting chamber and become desalted water W2. The demineralized water W2 is sent to the heated water tank 61 that is temporarily stored for supply to the demand point via the demineralized water line L24. Further, residual ions captured by the ion exchanger in the desalination chamber move to the concentration chamber by the electric energy of the applied DC voltage. And the water containing a residual ion is discharged | emitted out of the system of the water treatment apparatus 22 through the EDI concentrated water line L25 from the concentration chamber as the 2nd concentrated water W31. The second concentrated water W31 may be mixed with the supply water W1 to the RO membrane module 32 instead of being discharged out of the system of the water treatment device 22.

  The demineralized water line L24 is a line through which the demineralized water W2 obtained in the EDI stack 33 is treated as treated water (pure water) through the merging line L31, the heat exchanger 62, and the like toward the heated water tank 61. .

  As shown in FIG.1 and FIG.2, the upstream edge part of the desalination water line L24 is connected to the secondary side port (exit side of a desalination chamber) of the EDI stack 33. FIG. The downstream end of the demineralized water line L24 (treated water line L2) from each water treatment device 22 joins at the connection portion J31 and is connected to the upstream end of the merge line L31. The merge line L31 is connected to the upstream end of the warming water line L6 and the upstream end of the room temperature water line L32 at the connection J32. The downstream end of the warming water line L6 is connected to the warming water tank 61. The downstream end of the room temperature water line L <b> 32 is connected to the room temperature water tank 65.

  The demineralized water W2 sent from the EDI stack 33 (the outlet side of the demineralization chamber) is selectively heated via the heated water line L6 or the normal temperature water line L32 by opening / closing a valve (not shown) or the normal temperature water tank 61 or the normal temperature. The water tank 65 is replenished. That is, when the treated water produced by the water treatment device group 21 is replenished to the heated water tank 61, the replenishment of treated water to the room temperature water tank 65 is stopped. Conversely, when the treated water produced by the water treatment device group 21 is being replenished to the room temperature water tank 65, the replenishment of the treated water to the heated water tank 61 is stopped.

  The 1st flow sensor FM1 is an apparatus which measures the flow volume of the water (permeated water W21) which distribute | circulates the permeated water line L21. The second flow rate sensor FM2 is a device that measures the flow rate of water (desalted water W2) flowing through the desalted water line L24. The flow rate (detected flow rate value) of the permeated water W21 measured by the first flow rate sensor FM1 and the desalted water W2 measured by the second flow rate sensor FM2 is transmitted to the first local control unit 35 as a detection signal.

  The heat exchanger 62 performs heat exchange between the treated water W2 flowing through the heated water line L6 and the steam SM1 flowing through the steam line L4, and heats the treated water W2 to a predetermined temperature (for example, 80 ° C.). And it is an apparatus which obtains the warming water W3.

  The heated water tank 61 is a tank that stores the desalted water W2 obtained by the desalting process in the EDI stack 33 as heated treated water. The downstream end of the warming water line L6 is connected to the warming water tank 61. The room temperature water tank 65 is a tank that stores the desalted water W2 obtained by the desalting process in the EDI stack 33 as treated water that is not heated. The cold water tank 65 is connected to the downstream end of the cold water line L32.

  The heated water tank 61 is connected to a downstream demand point device or the like (not shown) via a heated water distribution line L7. The warming water distribution line L7 is a line through which the warming water W3 stored in the warming water tank 61 is circulated to an apparatus at a demand location. Desalinated water (treated water) W2 stored in the heated water tank 61 is supplied as heated pure water to a device or the like at a demand point via the heated water distribution line L7.

  The heated water tank 61 is provided with a water level sensor 63. The water level sensor 63 is a device that detects the water level of the warmed water W3 stored in the warmed water tank 61. The water level sensor 63 is electrically connected to the first system control unit 25. The water level of the heated water tank 61 measured by the water level sensor 63 (hereinafter also referred to as “detected water level value”) is output as a detection signal to the first system control unit 25 and the second system control unit 45.

  In the present embodiment, the water level sensor 63 is, for example, a level switch. The level switch is a preset liquid level position detector, and is configured to detect, for example, a plurality of liquid level positions (for example, 4 positions). The water level sensor 63 is not limited to a level switch, and may be, for example, a continuous level sensor. As the continuous level sensor, for example, a capacitive sensor, a pressure sensor, an ultrasonic sensor, or the like is used.

  The room temperature water tank 65 is connected to a downstream demand point device or the like (not shown) via a room temperature water distribution line L71. The room-temperature water distribution line L71 is a line through which the treated water W2 stored in the room-temperature water tank 65 is circulated to an apparatus or the like at a demand location. The demineralized water (treated water) W2 stored in the room temperature water tank 65 is supplied to a device or the like at a demand location as unheated room temperature pure water via a room temperature water distribution line L71.

  A steam trap 64 is provided at the end of the steam line L4 on the downstream side of the heat exchanger 62. Steam condensate (drain water) W41 is generated by the heat exchanger 62 depriving the latent heat of the steam SM1. The upstream end of the steam condensed water return line L42 is connected to the steam trap 64. The downstream end portion of the steam condensed water return line L42 is connected to the supply water line L1 at the connection portion J1 upstream of the pressure reducing valve V11. The steam condensed water W41 separated from the steam by the steam trap 64 is mixed with the supply water W1 flowing through the supply water line L1. Thereby, steam condensed water W41 heats up while diluting supply water W1.

  The supply water W1 such as tap water usually contains silica as an impurity. When the temperature rise and dilution of the feed water W1 occur due to the mixing of the steam condensed water W41, the solubility of silica increases and the concentration of silica decreases. As a result, the recovery rate of the permeated water W21 is increased in the RO membrane module 32, and water saving in the water treatment system 2 is achieved.

  The water treatment system 2 can be provided with various devices, valves, lines, and the like related to water treatment in addition to the devices, valves, and lines described above. For example, various devices, valves, lines, and the like can be provided as described in JP 2014-184407 A.

  The first system control unit 25 is electrically connected to the first local control unit 35 of each water treatment device 22 in order to control the entire water treatment device group 21. The first system control unit 25 sets the target flow rate value of the treated water W2 to the first local control unit 35 of each water treatment device 22 in accordance with the detected water level value of the water level sensor 63 provided in the heated water tank 61. specify. In particular, when the detected water level value of the water level sensor 63 is between the lower limit setting water level and the upper limit setting water level, the first system control unit 25 controls the second system control of the boiler system 4 with respect to the first local control unit 35. The target flow rate value of the treated water W2 determined by the cooperation with the unit 45 is designated.

  The relationship between the water level of the heated water tank 61 and the target flow rate value of the treated water W2 produced by each water treatment device 22 will be described. As shown in FIG. 4, in the present embodiment, the water level of the warming water tank 61 is in four stages of WL1, WL2, WL3, WL4 in order from the lowest to the highest (˜WL1; WL1 to WL2; WL2 WL3; WL3 to WL4; WL4 to 5 divisions).

  [1] When the detected water level value of the water level sensor 63 falls below the water level WL1, the first system control unit 25 sets the maximum production flow rate of the treated water W2 that can be produced by the water treatment device 22 to the first local control unit 35. Specify as the target flow rate value. Thereby, all the machines of the water treatment apparatus 22 start the operation with the maximum production water volume, and the treated water W2 is produced with a 100% flow rate value. Further, the first system control unit 25 calculates the flow rate obtained by multiplying the target flow rate value designated for the first local control unit 35 by the number n of the water treatment device groups 21 (that is, 100% flow rate value × n units). Based on the above, the heat exchange amount Qw on the treated water W2 side necessary for heating the treated water W2 passing through the heat exchanger 62 to a predetermined target temperature (for example, 80 ° C.) is calculated. Information on the heat exchange amount Qw on the treated water W2 side is shared with the second system control unit 45. The above control process is continued while the detected water level value of the water level sensor 63 is below the water level WL2.

  [2] When the detected water level value of the water level sensor 63 becomes equal to or higher than the water level WL2, the first system control unit 25 performs processing in the heat exchanger 62 from the heat exchange amount Qs on the steam SM1 side calculated by the second system control unit 45. A process for calculating the heat exchange amount Qw on the water W2 side and heating the treated water W2 passing through the heat exchanger 62 to a predetermined target temperature (for example, 80 ° C.) based on the heat exchange amount Qw on the treated water W2 side. The flow rate of water W2 is determined. Then, the divided flow rate obtained by dividing the flow rate of the treated water W2 by the number of water treatment device groups 21 is designated as the target flow rate value for the first local control unit 35. Thereby, all the units of the water treatment device 22 are switched to the operation at the production flow rate assigned to each unit at the divided flow rate. The above control process is continued until the detected water level value of the water level sensor 63 reaches the water level WL3.

  [3] When the detected water level value of the water level sensor 63 exceeds the water level WL3, the first system control unit 25 sets the minimum production flow rate of the treated water W2 that can be produced by the water treatment device 22 to the first local control unit 35. Specify as the target flow rate value. Thereby, all the machines of the water treatment device 22 are switched to the operation at the minimum production flow rate, and the treated water W2 is manufactured at a flow rate value of 20%, for example. Further, the first system control unit 25 calculates the flow rate obtained by multiplying the target flow rate value designated for the first local control unit 35 by the number n of the water treatment device groups 21 (that is, 20% flow rate value × n units). Based on the above, the heat exchange amount Qw on the treated water W2 side necessary for heating the treated water W2 passing through the heat exchanger 62 to a predetermined target temperature (for example, 80 ° C.) is calculated. Information on the heat exchange amount Qw on the treated water W2 side is shared with the second system control unit 45. The above control process is continued until the detected water level value of the water level sensor 63 reaches the water level WL4.

  [4] When the detected water level value of the water level sensor 63 exceeds the water level WL4, the first system control unit 25 sets the first flow rate for stopping the production of the treated water W2 in the water treatment device 22 (that is, zero production flow rate). A target flow rate value is specified for the local control unit 35. Thereby, all the machines of the water treatment device 22 stop the operation (0% flow rate value).

  In [2] above, “calculating the heat exchange amount Qw on the treated water W2 side in the heat exchanger 62 from the heat exchange amount Qs on the steam SM1 side” means that the heat exchange amount is completely balanced as Qw = Qs. As well as the case of calculating in consideration of the heat conduction loss due to the characteristics of the heat exchanger, such as Qw = α · Qs (α <1).

The heat exchange amount Qs on the steam SM1 side in the heat exchanger 62 calculated by the second system control unit 45 is defined by the following equation (1).
Qs [kW] = E [kJ / kg] × S [kg / h] / 3600 (1)

  In the formula (1), E: latent heat amount of saturated steam, S: steam amount. The steam amount S is the total value of the output steam amount of the steam boiler 42 collected by the second system control unit 45 or the total value of the output steam amount assigned to each steam boiler 42 by the second system control unit 45 (= required steam). Amount). Collection and allocation of the output steam amount of the steam boiler 42 by the second system control unit 45 will be described later.

The heat exchange amount Qw on the treated water W2 side in the heat exchanger 62 calculated by the first system control unit 25 is defined by the following equation (2).
Qw [kW] = (T ₂ [° C.] − T ₁ [° C.] × D [kg / m ³ ] × C [kJ / kg ° C.] × W [m ³ / h] / 3600 (2)

In formula (2), T ₁ is the inlet temperature of the heat exchanger, T ₂ is the outlet temperature of the heat exchanger, D is the specific gravity of water, C is the specific heat of water, and W is the flow rate of water. The water flow rate W corresponds to the total amount of treated water W2 produced by the water treatment device 22.

  As described above, after the operation of the water treatment device 22 is started, while the detected water level value of the water level sensor 63 is not less than the water level WL2 and not more than the water level WL3, the first system control unit 25 sets the divided flow rate as the target flow rate value. The first local control unit 35 executes the flow rate control of the treated water W2 according to the target flow rate value. That is, the first system control unit 25 sets the water level WL2 as the lower limit set water level, the water level WL3 as the upper limit set water level, and the detected water level value of the water level sensor 63 does not fall below the lower limit set water level and does not exceed the upper limit set water level. The water treatment device 22 is caused to execute flow rate control according to the divided flow rate.

  The first system control unit 25 includes a first local control unit so that the production flow rate of the water treatment device 22 constituting the water treatment device group 21 is equal to any of the maximum production flow rate, the minimum production water amount, and the divided flow rate. 35 is controlled. However, when the RO membrane module 32 operates at a low pressure and the water quality of the permeated water W21 decreases, the number of operating RO membrane modules 32 (water treatment devices 22) is decreased to avoid the low pressure operation. As an avoidance method, for example, when the operating pressure of any RO membrane module 32 falls below a specified pressure, the operation is stopped, or when the electrical conductivity of the treated water W2 exceeds a specified value, one operation is stopped. Can be mentioned.

  The first local control unit 35 provided in each water treatment device 22 controls each water treatment device 22 in cooperation with the first system control unit 25. The first local control unit 35 calculates the drive frequency of the pressurization pump 36 using the physical quantity in the system so that the production flow rate of the treated water W2 becomes the target flow rate value specified by the first system control unit 25. Then, a frequency setting signal corresponding to the calculated value of the driving frequency is output to the inverter 37.

  The first local control unit 35 will be further described. The first local control unit 35 is configured by a microprocessor (not shown) including a CPU and a memory. The CPU of the microprocessor executes various controls described later according to a predetermined program read from the memory. Data and various programs for controlling the water treatment device 22 are stored in the memory of the microprocessor.

  As the flow rate feedback water volume control, the first local control unit 35 adds a velocity type digital PID algorithm so that the detected flow rate value of the second flow rate sensor FM2 becomes the target flow rate value specified by the first system control unit 25. The drive frequency of the pressure pump 36 is calculated, and a frequency setting signal corresponding to the calculated value of the drive frequency is output to the inverter 37. The flow rate feedback water amount control by the first local control unit 35 will be described later.

  The first local control unit 35 controls the drainage so that the recovery rate of the permeated water W21 and the circulation ratio of the first concentrated water W11 are maintained at preset values when the target flow rate value is changed (increased / decreased). The valve opening degree of the valve V23 and the valve opening degree of the return control valve V22 are controlled.

  The first local control unit 35 controls the DC power supply 34 so that a DC voltage having a preset voltage value is supplied to the EDI stack 33 (hereinafter also referred to as “voltage value control”). Specifically, the first local control unit 35 changes the voltage value of the DC voltage supplied to the EDI stack 33 according to the detected flow rate value of the permeated water W21 output from the first flow rate sensor FM1. The DC power supply 34 is controlled. More specifically, the first local control unit 35 controls the DC power supply 34 such that the voltage value of the DC voltage supplied to the EDI stack 33 increases as the detected flow rate value of the permeated water W21 increases. Then, the DC power supply 34 is controlled so that the voltage value of the DC voltage supplied to the EDI stack 33 decreases as the detected flow rate value of the permeated water W21 decreases.

  In the memory (not shown) of the microprocessor constituting the first local control unit 35, there is a relational expression (program) for associating the detected flow rate value of the permeated water W21 with the voltage value of the DC voltage supplied to the EDI stack 33. It is remembered. The first local control unit 35 calculates a voltage value corresponding to the detected flow rate value of the first flow rate sensor FM1 by the above relational expression, and outputs an applied voltage setting signal corresponding to this voltage value to the DC power supply device 34. The voltage value control of the DC power supply 34 by the first local control unit 35 will be described later.

  In the first local control unit 35, a data table in which the flow rate value of the permeated water W21 and the voltage value of the DC voltage output to the EDI stack 33 are associated with each other is stored in the memory of the microprocessor. The voltage value of the direct current voltage may be acquired based on this.

  Next, flow rate feedback water amount control by the first local control unit 35 will be described. FIG. 5 is a flowchart showing a processing procedure when the flow rate feedback water amount control is executed in the water treatment device 22. The process of the flowchart shown in FIG. 5 is repeatedly executed during operation of the water treatment device 22.

In step ST101 shown in FIG. 5, the first local control unit 35 acquires the target flow rate value G _t ′ of the treated water (demineralized water) W2. As described above, the target flow rate value G _t ′ is a value designated by the first system control unit 25 and is changed according to the detected water level value of the water level sensor 63.

In step ST 102, a first local control unit 35 acquires the detected flow rate value _{G t} of the second flow rate sensor FM2 as a feedback value.

In step ST 103, a first local control unit 35, so that the detected flow rate value (feedback value) _{G t} obtained in step ST 102, the deviation between the target flow rate value _{G t} 'obtained in step ST101 becomes zero, the speed calculating a manipulated variable _{U n} by shape digital PID algorithm. In the speed type digital PID algorithm, an operation amount change ΔU _n is calculated every predetermined control period Δt (for example, 100 ms), and this is added to the operation amount _Un-1 at the time of the previous control period. _Is determined.

An arithmetic expression used for the velocity type digital PID algorithm is represented by the following expressions (3a) and (3b).
_{ΔU n = K p {(e} n -e n-1) + (Δt / T i) × e n + (T d / Δt) × (e n -2e n-1 + e n-2)} (3a)
U _n = U _n-1 + ΔU _n (3b)

In Expression (3a) and Expression (3b), Δt: control period, U _n : current operation amount, U _n-1 : operation amount at the previous control period, ΔU _n : change in operation amount from the previous time to this time. Minute, e _n : magnitude of current deviation, e _n-1 : magnitude of deviation at the previous control cycle, e _n-2 : magnitude of deviation at the previous control cycle, K _p : proportional gain, T _i : integration time, T _d : differentiation time. The size e _n of the current deviation is obtained by the following formula (4).
e _n = G _t ′ −G _t (4)

In step ST104, the first local control unit 35 performs a predetermined calculation using the current operation amount U _n , the target flow rate value G _t ′, and the maximum drive frequency of the pressurizing pump 36 (set value of 50 Hz or 60 Hz). The drive frequency F [Hz] of the pressurizing pump 36 is calculated by the equation.

  In step ST105, the first local control unit 35 converts the calculated value of the drive frequency F into a corresponding frequency setting signal (for example, a current value signal of 4 to 20 mA or a voltage value signal of 0 to 10 V), and this frequency setting. The signal is output to the inverter 37. Thereby, the process of this flowchart is complete | finished (it returns to step ST101). In step ST105, when the first local control unit 35 outputs a frequency setting signal to the inverter 37, the inverter 37 supplies the driving power converted to the frequency specified by the input frequency setting signal to the pressurizing pump 36. Supply. As a result, the pressurizing pump 36 is driven at a rotational speed corresponding to the driving frequency input from the inverter 37.

  Next, voltage value control by the first local control unit 35 will be described. FIG. 6 is a flowchart showing a processing procedure in the case of executing voltage value control of the DC power supply device 34 in the water treatment device 22. The process of the flowchart shown in FIG. 6 is repeatedly executed during operation of the water treatment device 22.

In step ST201 shown in FIG. 6, the first local control unit 35 acquires the detected flow rate value _{G p} of the first flow rate sensor FM1.

In step ST 202, a first local control unit 35 substitutes the detected flow rate value _{G p} obtained in step ST 201, the relational expression associating the voltage value of the DC voltage to be outputted to the detected flow value and EDI stack 33 permeate W21 Then, the voltage value of the DC voltage is calculated.

  In step ST203, the first local control unit 35 converts the voltage value obtained by the calculation into an applied voltage setting signal (for example, a current value signal of 4 to 20 mA or a voltage value signal of 0 to 10 V). An applied voltage setting signal is output to the DC power supply 34. Thereby, the process of this flowchart is complete | finished (it returns to step ST201). When the applied voltage setting signal is input from the first local control unit 35, the DC power supply 34 supplies a DC voltage having a voltage value specified by the applied voltage setting signal to the EDI stack 33.

[Boiler system 4]
The boiler system 4 will be described. The boiler system 4 includes a steam boiler group 41 including one or more (three in this embodiment) steam boilers 42, a steam header 43 that collects steam generated in the steam boiler 42, and a steam boiler group 41. And a second system control unit 45 that controls the combustion state.

The steam boiler group 41 generates steam that is a heat source for heating the treated water W2.
The steam header 43 is connected to a plurality of steam boilers 42 constituting the steam boiler group 41 via individual steam lines L41. The downstream side of the steam header 43 is connected to the heat exchanger 62 via the steam line L4.
The steam header 43 collects and stores the steam generated by the steam boiler group 41 to adjust the pressure difference and pressure fluctuation between the steam boilers 42, and the steam whose pressure is adjusted is converted into a heat exchanger. 62.

  In the steam line L4, a strainer, a pressure reducing valve, and a relief valve (not shown) are sequentially provided from the steam header 43 toward the heat exchanger 62. The strainer removes foreign substances contained in the steam. The pressure reducing valve reduces the pressure of the steam to a pressure lower than the maximum design pressure of the heat exchanger 62 (for example, 0.2 MPa). The relief valve releases the steam to protect the heat exchanger 62 when the pressure of the steam exceeds the set pressure.

  The steam boiler 42 has a boiler main body 51 in which combustion is performed, an economizer 52 through which the exhaust gas G2 from the boiler main body 51 is passed and preheats the boiler feed water W4 with the heat of the exhaust gas G2, and water supply before being passed through the economizer 52 A temperature sensor TS that measures temperature and a second local control unit 55 are included. Each of the steam boilers 42 in the present embodiment is a small once-through boiler that uses softened water as boiler feed water.

  In the boiler body 51, the fuel supplied from the fuel supply unit 53 is burned by a burner (not shown) provided in the boiler body 51. The combustion gas G1 generated by this combustion heats the water inside the can body (not shown) of the boiler body 51 and is discharged to the discharge passage 54 as the exhaust gas G2.

  The discharge path 54 is a passage for transferring the exhaust gas G2 generated by combustion in the boiler body 51 from the boiler body 51 to a discharge unit that is opened to the atmosphere and discharging it into the atmosphere. The discharge path 54 has a descending circulation part as a circulation part extending in the vertical direction at least in part. In the descending circulation part, the exhaust gas G2 descends from the upper side and circulates.

  The economizer 52 is mainly composed of a portion arranged in a descending flow portion of the discharge passage 54 in the boiler water supply line L5. The economizer 52 heats the boiler feed water W <b> 4 in advance with the exhaust gas G <b> 2 discharged from the boiler body 51 and flowing through the discharge path 54, and then supplies the boiler feed water W <b> 4 to the boiler body 51.

  The temperature sensor TS is provided in the boiler feed water line L5 on the upstream side of the economizer 52, and measures the temperature of the boiler feed water W4 (that is, the feed water temperature) before being preheated.

  In this embodiment, the steam boiler 42 is comprised from the step value control boiler. A step value control boiler is a boiler that can change the combustion rate step by step, and is selected by controlling the amount of combustion by selectively turning combustion on and off or adjusting the size of the flame. The output steam amount can be increased or decreased step by step according to the combustion position. The stage value control boiler refers to a boiler whose combustion position is small compared to the proportional control boiler.

  In the three steam boilers 42 composed of the stage value control boilers in the present embodiment, the output steam amounts at the respective combustion positions are set equal.

Stage value control boiler
1) Combustion stopped state (first combustion position: combustion rate 0%; output steam volume 0%)
2) Low combustion state L (second combustion position: combustion rate 20%; output steam volume 20%)
3) Medium combustion state M (third combustion position: combustion rate 45%; output steam volume 45%)
4) High combustion state H (fourth combustion position: combustion rate 100%; output steam volume 100%)
These four-stage combustion states (combustion rate, output steam amount) are controllable so-called four-position control. The N position control means that the combustion amount of the step value control boiler can be controlled stepwise to the N position including the combustion stop state.

The second system control unit 45 is electrically connected to the second local control unit 55 of each steam boiler 42 in order to control the entire steam boiler group 41. The second system control unit 45 collects the output steam amount of the steam boiler 42 constituting the steam boiler group 41. For example, the current output steam amount in each steam boiler 42 is calculated by the following equation (5) based on the current combustion rate of the boiler body 51 controlled by the second local control unit 55.
Output steam volume [kg / h] = maximum output steam volume [kg / h] × current combustion rate [%] / 100 (5)

  Here, the maximum output steam amount is the output steam amount when the combustion rate of the steam boiler 42 is 100%. For example, when the current combustion rate of three steam boilers having a maximum output steam amount of 2000 kg / h is 45%, the current output steam amount of each steam boiler is 900 kg / h. Therefore, the total output steam amount collected by the second system control unit 45 is 2700 kg / h.

  The output steam amount of the steam boiler 42 can be measured by a steam flow meter provided in the individual steam line L41, or the steam pressure detected by the pressure sensor provided in the individual steam line L41 is converted into a steam flow rate. It can also be grasped.

  Further, the second system control unit 45 operates at a predetermined combustion rate with respect to the second local control unit 55 of each steam boiler 42 according to the detected water level value of the water level sensor 63 provided in the heated water tank 61 or Command the release. In particular, when the detected water level value of the water level sensor 63 is between the lower limit set water level and the upper limit set water level, the second system control unit 45 performs self-sustained combustion control (described later) of the second local control unit 55. The boiler main body 51 is burned at a preset predetermined combustion rate. On the other hand, when the detected water level value of the water level sensor 63 falls below the lower limit set water level or exceeds the upper limit set water level, the second system control unit 45 controls the water treatment system 2 with respect to the second local control unit 55. A combustion rate determined by cooperation with the first system control unit 25 is designated.

  The relationship between the water level in the heated water tank 61 and the combustion rate (that is, the output steam amount) of each steam boiler 42 will be described. As shown in FIG. 4 described above, in the present embodiment, the water level of the warming water tank 61 is in four stages of WL1, WL2, WL3, WL4 in order from low to high (˜WL1; WL1-WL2; WL2-WL3; WL3-WL4; WL4-).

  [1] When the detected water level value of the water level sensor 63 falls below the water level WL1, the second system control unit 45 first sets the predetermined combustion rate to the second local control unit 55 so as to cancel the combustion control at the predetermined combustion rate. Send an operation release signal. Next, the second system control unit 45 calculates the heat exchange amount Qs on the steam SM1 side in the heat exchanger 62 from the heat exchange amount Qw on the treated water W2 side calculated by the first system control unit 25, and this steam The necessary steam amount for obtaining the heat exchange amount Qs on the SM1 side is determined. Then, the second system control unit 45 divides the necessary steam amount by the number of steam boiler groups 41 so that the boiler main body 51 is burned at a combustion rate that is an output steam amount obtained. A combustion rate designation signal is transmitted to. Thereby, all the machines of the steam boiler 42 start the operation at the combustion rate designated for each machine by the combustion rate designation signal. The above control process is continued while the detected water level value of the water level sensor 63 is below the water level WL2.

  [2] When the detected water level value of the water level sensor 63 is equal to or higher than the water level WL2, the second system control unit 45 instructs the second local control unit 55 to burn the boiler body 51 at a preset predetermined combustion rate. A predetermined combustion rate operation execution signal is transmitted. Thereby, all the machines of the steam boiler 42 are switched to the operation at the predetermined combustion rate set in the second local control unit 55 of each machine. The predetermined combustion rate will be described later. The above control process is continued until the detected water level value of the water level sensor 63 reaches the water level WL3.

  [3] When the detected water level value of the water level sensor 63 is equal to or higher than the water level WL3, the second system control unit 45 first sets the predetermined combustion rate to the second local control unit 55 so as to cancel the combustion control at the predetermined combustion rate. Send an operation release signal. Next, the second system control unit 45 calculates the heat exchange amount Qs on the steam SM1 side in the heat exchanger 62 from the heat exchange amount Qw on the treated water W2 side calculated by the first system control unit 25, and this steam The necessary steam amount for obtaining the heat exchange amount Qs on the SM1 side is determined. Then, the second system control unit 45 divides the necessary steam amount by the number of steam boiler groups 41 so that the boiler main body 51 is burned at a combustion rate that is an output steam amount obtained. A combustion rate designation signal is transmitted to. Thereby, all the machines of the steam boiler 42 are switched to the operation at the combustion rate designated for each machine by the combustion rate designation signal. The above process is continued until the detected water level value of the water level sensor 63 reaches the water level WL4.

  [4] When the detected water level value of the water level sensor 63 exceeds the water level WL4, the second system control unit 45 sets the combustion rate for stopping the steam generation in the steam boiler 42 (that is, the output steam amount of zero) to the second local It designates with respect to the control part 55. Thereby, all the machines of the steam boiler 42 stop operation.

  In [1] and [3] above, “calculating the heat exchange amount Qs on the steam SM1 side in the heat exchanger 62 from the heat exchange amount Qw on the treated water W2 side” means that the heat exchange amount is Qs = Qw. This includes not only the case of calculating as perfectly balanced but also the case of calculating in consideration of the heat conduction loss due to the characteristics of the heat exchanger, such as α · Qs = Qw (α <1).

  The heat exchange amount Qs on the steam SM1 side in the heat exchanger 62 calculated by the second system control unit 45 is defined by the above equation (1). Further, the heat exchange amount Qw on the treated water W2 side in the heat exchanger 62 calculated by the first system control unit 25 is defined by the above equation (2).

  Thus, after the operation of the steam boiler 42 is started, the second system control unit 45 transmits a predetermined combustion rate operation execution signal while the detected water level value of the water level sensor 63 is not less than the water level WL2 and not more than the water level WL3. Then, the second local control unit 55 burns the boiler body 51 at a preset predetermined combustion rate. That is, the second system control unit 45 sets the water level WL2 as the lower limit set water level, the water level WL3 as the upper limit set water level, and the detected water level value of the water level sensor 63 does not fall below the lower limit set water level and does not exceed the upper limit set water level. The steam boiler 42 is caused to execute combustion control according to a predetermined combustion rate.

  The second local control unit 55 provided in each steam boiler 42 controls each steam boiler 42 in cooperation with the second system control unit 45. The second local control unit 55 collectively performs combustion control, water supply control, blow control, and the like of the boiler body 51.

  In the operation at a predetermined combustion rate that is executed when the detected water level value of the water level sensor 63 is between the lower limit set water level WL2 and the upper limit set water level WL3, the second local control unit 55 of the step value control boiler It is preferable that the boiler body 51 is burned at the combustion rate of the eco operation point EP, which is the combustion rate at which the boiler efficiency is highest.

  When the boiler main body 51 is burned at the combustion rate of the eco-operation point EP, the second local control unit 55 can also set the eco-operation point EP based on the temperature of the boiler feed water W4 measured by the temperature sensor TS. . When the temperature of the boiler feed water W4 is stable throughout the year, the fixed eco-operation point EP can be set regardless of the measured value of the temperature sensor TS, but the temperature of the boiler feed water W4 varies greatly. When doing so, it is preferable to switch the eco-operation point EP according to the measured value of the temperature sensor TS.

  Regarding the details of the eco-operation point EP in the stage value control boiler and the switching of the eco-operation point EP according to the temperature of the boiler feed water W4 (for example, the low combustion state and the middle combustion state), the description in Japanese Patent No. 4661993 is appropriately applied or Incorporated.

  Note that the steam boiler 42 of the boiler system 4 may be a proportional control boiler capable of burning by continuously changing the combustion rate. The proportional control boiler is a continuous combustion amount at least in the range from the minimum combustion state (for example, combustion rate 20%; output steam amount 20%) to the maximum combustion state (combustion rate 100%; output steam amount 100%). It is a boiler that can be controlled. The proportional control boiler adjusts the amount of combustion by, for example, controlling the opening degree (combustion ratio) of a valve that supplies fuel to the burner and a valve that supplies combustion air.

  Further, the continuous control of the combustion amount means that the calculation or signal in the second local control unit 55 is digital and handled in stages (for example, the output steam amount (combustion rate) of the steam boiler 42 is 1). Even when controlled in increments of%), includes the case where the output steam volume can be controlled virtually continuously.

  Normally, a minimum load factor that is a load factor in the minimum combustion state is set in the proportional control boiler. And the change of the combustion state between the combustion stop state of the proportional control boiler and the minimum combustion state is controlled by turning on / off the combustion of the proportional control boiler (burner). In the range from the minimum combustion state to the maximum combustion state, the combustion amount can be continuously controlled.

  In the operation at a predetermined combustion rate that is executed when the detected water level value of the water level sensor 63 is between the lower limit set water level WL2 and the upper limit set water level WL3, the second local control unit 55 of the proportional control boiler performs the predetermined combustion. As a rate, it is preferable to burn the boiler body 51 at a combustion rate in the eco-operation zone EZ including the eco-operation point EP. This eco-operation zone EZ is a range of a combustion rate that can increase boiler efficiency when the boiler body 51 is burned.

  When the boiler body 51 is burned at the combustion rate in the eco operation zone EZ, the second local control unit 55 can also set the eco operation zone EZ based on the temperature of the boiler feed water W4 measured by the temperature sensor TS. . When the temperature of the boiler feed water W4 is stable throughout the year, the fixed eco-operation zone EZ can be set regardless of the measured value of the temperature sensor TS, but the temperature of the boiler feed water W4 varies. In this case, it is preferable to switch the eco driving zone EZ according to the measured value of the temperature sensor TS.

  Regarding the details of the eco-operation zone EZ in the proportional control boiler and the switching of the eco-operation zone EZ depending on the boiler feed water temperature (for example, the proportional zone for low combustion and the middle combustion proportional zone), the description in Japanese Patent No. 5339219 is appropriately described. Applied or incorporated.

[Cooperation control between the first system control unit 25 and the second system control unit 45]
Next, the water amount control of the water treatment device 22 and the combustion control of the steam boiler 42 by the cooperation of the first system control unit 25 of the water treatment system 2 and the second system control unit 45 of the boiler system 4 will be described. FIG. 7 is a flowchart showing a procedure for specifying a target flow rate value by the first system control unit 25. FIG. 8 is a flowchart showing a procedure for switching the combustion rate by the second system control unit 45. The process of the flowchart shown in FIG.7 and FIG.8 is repeatedly performed during operation | movement of the heating water manufacturing system 1. FIG.

The first system control unit 25 acquires the detected water level value W of the water level sensor 63 in step ST301.
Similarly, the 2nd system control part 45 acquires the detection water level value W of the water level sensor 63 in step ST401.

[Detected water level value Y <determination of water level WL1]
In step ST302, the first system control unit 25 determines whether or not the detected water level value Y of the water level sensor 63 is lower than the water level WL1. When it is determined that the detected water level value Y is lower than the water level WL1 (YES), the process proceeds to step ST303. When it is determined that the detected water level value Y does not fall below the water level WL1 (NO), the process proceeds to step ST305.
Similarly, in step ST402, the second system control unit 45 determines whether or not the detected water level value Y of the water level sensor 63 is lower than the water level WL1. When it is determined that the detected water level value Y is lower than the water level WL1 (YES), the process proceeds to step ST403. When it is determined that the detected water level value Y does not fall below the water level WL1 (NO), the process proceeds to step ST409.

[In the case of detected water level value Y <water level WL1: processing of first system control unit 25]
In step ST303, the first system control unit 25 specifies the maximum production flow rate of the treated water W2 that can be produced by the water treatment device 22 as the target flow rate value G _t ′ for the first local control unit 35. Thereby, all the machines of the water treatment apparatus 22 start the operation with the maximum production water amount (100% flow rate value). In step ST304, the first system control unit 25 obtains the flow rate obtained by multiplying the target flow rate value G _t ′ designated for the first local control unit 35 by the number n of the water treatment device groups 21 (that is, W = G). _{Based on t} ′ × n), the above-described equation (2) is used to treat the treated water W2 passing through the heat exchanger 62 to a predetermined target temperature (for example, 80 ° C.) on the treated water W2 side. The heat exchange amount Qw is calculated.

[In the case of detected water level value Y <water level WL1: processing of second system control unit 45]
On the other hand, in Step ST403, the second system control unit 45 instructs the second local control unit 55 to cancel the combustion control at a predetermined combustion rate (for example, the combustion rate at the eco-operation point EP or the eco-operation zone EZ). Then, a predetermined combustion rate operation release signal is transmitted. In step ST404, the second system control unit 45 acquires the heat exchange amount Qw on the treated water W2 side in the heat exchanger 62 calculated by the first system control unit 25 in step ST304. In step ST405, the second system control unit 45 calculates the heat exchange amount Qs on the steam SM1 side in the heat exchanger 62 from the heat exchange amount Qw on the treated water W2 side acquired in step ST404 by, for example, a calculation formula of Qs = Qw. calculate. In step ST406, the second system control unit 45 determines the necessary steam amount S that can obtain the heat exchange amount Qs on the steam SM1 side calculated in step ST405, using the above-described equation (1). In step ST407, the second system control unit 45 divides the required steam amount S determined in step ST406 by the number m of the steam boiler groups 41 to output steam amount J of each steam boiler 42 (ie, J = S ÷ m ) In step ST408, the second system control unit 45 transmits a combustion rate designation signal to the second local control unit 55 so that the boiler body 51 is burned at the combustion rate corresponding to the output steam amount J obtained in step ST407. To do. Thereby, all the machines of the steam boiler 42 start the operation at the combustion rate designated for each machine by the combustion rate designation signal.

[Water Level WL1 ≦ Detected Water Level Value Y <Determination of Water Level WL2]
In step ST305, the first system control unit 25 determines whether or not the detected water level value Y of the water level sensor 63 is equal to or higher than the water level WL1 and lower than the water level WL2. When it is determined that the detected water level value Y is equal to or higher than the water level WL1 and lower than the water level WL2 (YES), the process proceeds to step ST303. If it is determined that the detected water level value Y does not fall below the water level WL2 (NO), the process proceeds to step ST306.
Similarly, in Step ST409, the second system control unit 45 determines whether or not the detected water level value Y of the water level sensor 63 is equal to or higher than the water level WL1 and lower than the water level WL2. When it is determined that the detected water level value Y is equal to or higher than the water level WL1 and lower than the water level WL2 (YES), the process proceeds to step ST403. When it is determined that the detected water level value Y does not fall below the water level WL2 (NO), the process proceeds to step ST410.

[When Water Level WL1 ≦ Detected Water Level Value Y <Water Level WL2: Process of First System Control Unit 25]
The first system control unit 25 performs the processes of step ST303 and step ST304 described above. Thereby, all the machines of the water treatment device 22 continue to operate at the maximum production water volume (100% flow rate value). Moreover, the 1st system control part 25 calculates the heat exchange amount Qw by the side of the treated water W2 required in order to heat the treated water W2 which passes the heat exchanger 62 to predetermined | prescribed target temperature (for example, 80 degreeC).

[When Water Level WL1 ≦ Detected Water Level Value Y <Water Level WL2: Process of Second System Control Unit 45]
On the other hand, the second system control unit 45 performs the processes of steps ST403 to ST408 described above. As a result, all the steam boilers 42 continue to operate at the combustion rate designated for each machine by the combustion rate designation signal.

[Water Level WL1 ≦ Detected Water Level Value Y <Determination of Water Level WL2]
In step ST306, the first system control unit 25 determines whether or not the detected water level value Y of the water level sensor 63 is not less than the water level WL2 and not more than the water level WL3. When it is determined that the detected water level value Y is not less than the water level WL2 and not more than the water level WL3 (YES), the process proceeds to step ST307. When it is determined that the detected water level value Y is not equal to or lower than the water level WL3 (NO), the process proceeds to step ST312.
Similarly, in step ST410, the second system control unit 45 determines whether or not the detected water level value Y of the water level sensor 63 is not less than the water level WL2 and not more than the water level WL3. When it is determined that the detected water level value Y is not less than the water level WL2 and not more than the water level WL3 (YES), the process proceeds to step ST411. When it is determined that the detected water level value Y is not equal to or lower than the water level WL3 (NO), the process proceeds to step ST414.

[When Water Level WL2 ≦ Detected Water Level Value Y ≦ Water Level WL3: Process of Second System Control Unit 45]
In step ST411, the second system control unit 45 causes the second local control unit to burn the boiler body 51 at a preset predetermined combustion rate (for example, the combustion rate of the eco-operation point EP or the eco-operation zone EZ). A predetermined combustion rate operation execution signal is transmitted to 55. Thereby, all the machines of the steam boiler 42 are switched to the operation at the predetermined combustion rate set in the second local control unit 55 of each machine. In Step ST412, the second system control unit 45 collects the output steam amount J of the steam boiler 42 that constitutes the steam boiler group 41. The current output steam amount J in each steam boiler 42 is calculated by the above equation (5). In step ST413, the second system control unit 45 uses the above-described equation (1) based on the total value (that is, S = J × m) of the output steam amount J of the steam boiler 42 collected in step ST412. A heat exchange amount Qs on the steam SM1 side in the heat exchanger 62 is calculated.

[When Water Level WL2 ≦ Detected Water Level Value Y ≦ Water Level WL3: Process of First System Control Unit 25]
In step ST307, the first system control unit 25 acquires the heat exchange amount Qs on the steam SM1 side in the heat exchanger 62 calculated by the first system control unit 25 in step ST412. In step ST308, the first system control unit 25 calculates the heat exchange amount Qw on the treated water W2 side in the heat exchanger 62 from the heat exchange amount Qs on the steam SM1 side acquired in step ST307 by, for example, a calculation formula of Qs = Qw. calculate. In step ST309, the 1st system control part 25 uses the formula (2) mentioned above based on the heat exchange amount Qw by the side of the treated water W2 calculated by step ST308, and the treated water W2 which passes the heat exchanger 62 is used. The flow rate W of the treated water W2 that can be heated to a predetermined target temperature (for example, 80 ° C.) is determined. In step ST310, the first system control unit 25 obtains a divided flow rate G (that is, G = W ÷ n) by dividing the flow rate W of the treated water W2 calculated in step ST309 by the number n of the water treatment device groups 21. . In Step ST311, the first system control unit 25 designates the divided flow rate G obtained in Step ST310 as the target flow rate value G _t ′ for the first local control unit 35. Thereby, all the units of the water treatment device 22 are switched to the operation at the production flow rate assigned to each unit with the divided flow rate G.

[Determination of Water Level WL3 <Detected Water Level Value Y ≦ Water Level WL4]
In step ST312, the first system control unit 25 determines whether or not the detected water level value Y of the water level sensor 63 is above the water level WL3 and below the water level WL4. When it is determined that the detected water level value Y exceeds the water level WL3 and is equal to or lower than the water level WL4 (YES), the process proceeds to step ST313. When it is determined that the detected water level value Y is not equal to or lower than the water level WL4 (NO), the process proceeds to step ST315.
Similarly, in step ST414, the second system control unit 45 determines whether or not the detected water level value Y of the water level sensor 63 is above the water level WL3 and below the water level WL4. When it is determined that the detected water level value Y exceeds the water level WL3 and is equal to or lower than the water level WL4 (YES), the process proceeds to step ST403. When it is determined that the detected water level value Y is not equal to or lower than the water level WL4 (NO), the process proceeds to step ST415.

[When Water Level WL3 <Detected Water Level Value Y ≦ Water Level WL4: Process of First System Control Unit 25]
In step ST313, the first system control unit 25 specifies the minimum production flow rate of the treated water W2 that can be produced by the water treatment device 22 as the target flow rate value G _t ′ for the first local control unit 35. Thereby, all the machines of the water treatment apparatus 22 are switched to the operation with the minimum production water volume (20% flow rate value). In step ST314, the first system control unit 25 obtains the flow rate obtained by multiplying the target flow rate value G _t ′ designated for the first local control unit 35 by the number n of the water treatment device groups 21 (that is, W = G). _{Based on t} ′ × n), the above-described equation (2) is used to treat the treated water W2 passing through the heat exchanger 62 to a predetermined target temperature (for example, 80 ° C.) on the treated water W2 side. The heat exchange amount Qw is calculated.

[When Water Level WL3 <Detected Water Level Value Y ≦ Water Level WL4: Process of Second System Control Unit 45]
On the other hand, the second system control unit 45 performs the processes of steps ST403 to ST408 described above. Thereby, all the machines of the steam boiler 42 are switched to the operation at the combustion rate designated for each machine by the combustion rate designation signal.

[Detection of detected water level value Y> water level WL4]
In step ST315, the first system control unit 25 determines whether or not the detected water level value Y of the water level sensor 63 exceeds the water level WL4. If it is determined that the detected water level value Y exceeds the water level WL3 (YES), the process proceeds to step ST316. If it is determined that the detected water level value Y does not exceed the water level WL4 (NO), the process returns to step ST301.
Similarly, in step ST415, the second system control unit 45 determines whether or not the detected water level value Y of the water level sensor 63 exceeds the water level WL4. When it is determined that the detected water level value Y exceeds the water level WL4 (YES), the process proceeds to step ST416. If it is determined that the detected water level value Y does not exceed the water level WL4 (NO), the process returns to step ST401.

[When the detected water level value Y> the water level WL4: processing of the first system control unit 25]
In step ST416, the first system control unit 25 sets a flow rate for stopping the production of the treated water W2 in the water treatment device 22 (that is, a production flow rate of zero) to the first local control unit 35 as a target flow rate value G _t ′. Specify as. Thereby, all the machines of the water treatment device 22 stop the operation (0% flow rate value).

[When the detected water level value Y> the water level WL4: processing of the second system control unit 45]
In step ST416, the second system control unit 45 designates, for the second local control unit 55, a combustion rate at which steam generation in the steam boiler 42 is stopped (that is, the output steam amount is zero). Thereby, all the machines of the steam boiler 42 stop operation.

  Note that, as shown in the flowchart of FIG. 7, after the processing of step ST304, step ST311, step ST314, and step ST316 is performed, the processing of the first local control unit 35 returns to step ST301. Further, as shown in the flowchart of FIG. 8, after the processing of step ST408, step ST413, and step ST416 is performed, the processing of the second local control unit 55 returns to step ST401.

According to the heated water production system 1 according to the present embodiment, for example, the following effects are exhibited.
In the heated water production system 1 according to the present embodiment, the water treatment device 22 is driven at a rotational speed according to the water treatment unit 31 that obtains the treated water W2 from the supplied water W1 and the input drive frequency, and the supplied water A pressurizing pump 36 that sucks W1 and discharges it toward the water treatment unit 31, an inverter 37 that outputs a driving frequency corresponding to the input frequency setting signal to the pressurizing pump 36, and a production flow rate of the treated water W2. The drive frequency of the pressurizing pump 36 is calculated using the physical quantity in the system so that the target flow rate value specified by the first system control unit 25 is obtained, and the frequency setting signal corresponding to the calculated value of the drive frequency is converted into an inverter. And a first local control unit 35 that outputs to 37. The steam boiler 42 includes a boiler body 51 in which combustion is performed, and a second local control unit 55 that burns the boiler body 51 at a preset predetermined combustion rate. The second system control unit 45 calculates the heat exchange amount Qs on the steam side in the heat exchanger 62 based on the collected total output steam amount of the steam boiler 42, and the first system control unit 25 The heat exchange amount Qw on the treated water side in the heat exchanger 62 is calculated from the heat exchange amount Qs on the steam side calculated by the system control unit 45, and the heat exchanger 62 is based on the heat exchange amount Qw on the treated water side. The flow rate of the treated water W2 that can heat the treated water W2 passing through the water to a predetermined target temperature is determined, and the divided flow rate obtained by dividing the flow rate of the treated water W2 by the number of the water treatment device groups 21 is a first local control. Designated as a target flow rate value for the unit 35.

  Therefore, according to the present embodiment, the steam boiler group 41 does not adjust the total value of the output steam amount following the temperature of the heated water W3 after passing through the heat exchanger 62, but instead of the boiler body 51. The operation is performed so as to keep the total value of the output steam amount (that is, the amount of heat input to the heat exchanger 62) constant without changing the combustion rate or the number of combustion. On the other hand, in the water treatment device group 21, the production flow rate of the treated water W2 is adjusted following the amount of heat input to the heat exchanger 62. Therefore, in the steam boiler group 41, there is little heat dissipation loss of the whole boiler system due to switching or starting / stopping of the combustion rate, and the energy efficiency of the boiler system 4 is improved.

  Further, in the water treatment device group 21, since the flow rate feedback water amount control using an inverter is performed in each machine of the water treatment device 22, the power consumption of the pressure pump 36 can be reduced. Further, in the water treatment device group 21, since the treated water W2 is manufactured at a divided flow rate in each machine of the water treatment device 22, the load of the water treatment unit 31 (RO membrane module 32) is dispersed, and the water treatment unit 31 Clogging risk is reduced. Therefore, in the water treatment device group 21, the pressure pump 36 is not driven with an excessive operating pressure or discharge flow rate, so that the energy efficiency of the water treatment system 2 is improved.

  In the heated water production system 1 according to the present embodiment, the second local control unit 55 causes the boiler body 51 to burn at the eco operation point EP or the eco operation zone EZ as the predetermined combustion rate. Combustion at the eco-operation point EP is preferably carried out in a stage value control boiler. Combustion in the eco operation zone EZ is preferably performed in a proportional control boiler.

  Therefore, according to the present embodiment, the steam boiler group 41 performs the operation with priority on the boiler efficiency at the eco-operation point EP or the eco-operation zone EZ, so that the heat dissipation loss of the entire boiler system is greatly reduced. Therefore, in the steam boiler group 41, the energy efficiency of the boiler system 4 is significantly improved.

  In the heated water production system 1 according to the present embodiment, the steam boiler 42 is passed through the economizer 52 that passes the exhaust gas G1 from the boiler body 51 and preheats the boiler feed water W4 with the heat of the exhaust gas G1, and the economizer 52. Temperature sensor TS for measuring the feed water temperature before or after passing water, and the second local control unit 55 determines the eco-operation point EP or the eco-operation zone EZ based on the measured value of the temperature sensor TS. Set.

  Therefore, according to the present embodiment, the steam boiler group 41 performs the operation with priority on the boiler efficiency at the eco operation point EP or the eco operation zone EZ while recovering the waste heat by the economizer 52, and therefore, the energy of the boiler system 4 Efficiency improves dramatically.

  The warming water manufacturing system 1 according to the present embodiment includes a water level sensor 63 that detects the water level of warming water stored in the warming water tank 61. The first system control unit 25 performs (i) first local control on the maximum production flow rate of the treated water W2 that can be produced by the water treatment device 22 when the detected water level value Y of the water level sensor 63 is lower than the lower limit set water level WL2. When the detected water level value Y of the water level sensor 63 exceeds the upper limit set water level WL3 while being designated as the target flow rate value for the unit 35, the minimum production flow rate of the treated water W2 that can be produced by the water treatment device 22 is set to the first. Based on the flow rate obtained by multiplying the target flow rate value specified for the first local control unit 35 by the number of water treatment device groups 21 and specifying the target flow rate value for the 1 local control unit 35. The amount of heat exchange Qw on the treated water side required for heating the treated water W2 passing through the heat exchanger 62 to a predetermined target temperature is calculated. The second system control unit 45 (i) cancels the combustion control at the predetermined combustion rate when the detected water level value Y of the water level sensor 63 is lower than the lower limit set water level WL2 or higher than the upper limit set water level WL3. A predetermined combustion rate operation cancellation signal is transmitted to the second local control unit 55, and (ii) the steam side in the heat exchanger 62 is calculated from the treated water side heat exchange amount Qw calculated by the first system control unit 25. Calculate the heat exchange amount Qs, determine the necessary steam amount to obtain the heat exchange amount Qs on the steam side, and divide this necessary steam amount by the number of steam boiler groups 41 to obtain the combustion rate that becomes the output steam amount Then, a combustion rate designation signal is transmitted to the second local control unit 55 so that the boiler body 51 is burned.

  Therefore, according to the present embodiment, when the water level of the heated water tank 61 exceeds the upper limit set water level WL3 and approaches full water, the production flow rate of the treated water W2 in the water treatment device group 21 is reduced. On the other hand, in the steam boiler group 41, the total value of the output steam amount is adjusted following the required heat amount in the heat exchanger 62. That is, when the warm water W3 is sufficiently secured, the operation is performed by reducing the production flow rate of the water treatment device 22 and the output steam amount of the steam boiler 42 within a range in which the water treatment device 22 and the steam boiler 42 are not stopped. Will continue. Therefore, since the frequency of stopping the water treatment device 22 and the steam boiler 42 is greatly reduced, the amount of discarded low-temperature warming water W3 at the time of system startup (that is, loss of water and heat due to disposal) is reduced. The energy efficiency of the water treatment system 2 and the boiler system 4 is improved.

  Further, when the water level in the heated water tank 61 falls below the lower limit set water level WL2 and approaches drought, the production flow rate of the treated water W2 in the water treatment device group 21 is increased. On the other hand, in the steam boiler group 41, the total value of the output steam amount is adjusted following the required heat amount in the heat exchanger 62. That is, when the warming water W3 is insufficient, the operation is performed by increasing the production flow rate of the water treatment device 22 and the output steam amount of the steam boiler 42 so that the production of the warming water W3 at the maximum flow rate is given priority. Be started. Therefore, a situation where the warming water tank 61 is short of the warming water W3 is avoided.

  The heated water production system 1 according to the present embodiment further includes a steam trap 64 provided in the steam line L4 on the downstream side of the heat exchanger 62. By mixing the steam condensate water W41 separated by the steam trap 64 with the feed water W1 to the water treatment unit 31, the feed water W1 is diluted and heated.

  Therefore, according to the present embodiment, the supply water W1 is mixed with the steam condensed water W41, which is substantially pure water, so that the salt concentration decreases and the temperature increases. When the salt concentration of the supply water W1 decreases, the purity of the permeate W21 produced by the RO membrane module 32 increases. As a result, the energization amount of the EDI stack 33 can be reduced, and the power consumption of the water treatment system 2 can be reduced. Moreover, since the viscosity coefficient of water falls when the temperature of the supply water W1 rises, the water permeability coefficient of the RO membrane module 32 becomes large and it becomes easy to permeate | transmit water. As a result, the operating pressure of the pressurizing pump 36 can be lowered, and the power consumption of the water treatment system 2 can be reduced. In addition, when the temperature of the supply water W1 (permeate water W21) rises, the diffusion coefficient of ions in water increases, so that the EDI stack 33 facilitates ion movement from the desalting chamber to the concentration chamber. As a result, the energization amount of the EDI stack 33 can be reduced, and the power consumption of the water treatment system 2 can be reduced. Furthermore, due to the dilution of the feed water W1 and the temperature rise, the concentration of silica contained in the feed water W1 decreases and the solubility of silica increases. As a result, the RO membrane module 32 can increase the recovery rate of the permeated water W21, so that the water treatment system 2 can save water.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiments, and can be implemented in various forms.

  The water treatment device may be a water treatment device other than the pure water production device, for example, various filtration devices. The number of water treatment devices 22 constituting the water treatment device group 21 is not limited. The number of steam boilers 42 constituting the steam boiler group 41 is not limited.

  In the embodiment, the example in which the flow rate feedback water amount control is executed as the flow rate control of the treated water W2 that calculates the drive frequency of the pressure pump 36 using the physical quantity in the system has been described. However, the present invention is not limited to this, and the flow rate control of the treated water W2 may be performed by pressure feedback water amount control or temperature feedforward water amount control described in JP 2014-184407 A.

  In the embodiment, the example in which the driving frequency of the pressurizing pump 36 is calculated by the speed type digital PID algorithm as the feedback control algorithm has been described. However, the present invention is not limited to this, and the driving frequency of the pressure pump 36 may be calculated by a position type digital PID algorithm. Further, the drive frequency may be calculated not only by the PID algorithm but also by the P algorithm or the PI algorithm. This is not limited to flow rate feedback water amount control, and the same applies when pressure feedback water amount control is employed.

  The first local control unit 35 changes the current value or voltage value of the power supplied to the EDI stack 33 according to the detected flow value of the first flow sensor FM1, but the detected flow rate of the second flow sensor FM2. Depending on the value, the current value or the voltage value of the power supplied to the EDI stack 33 may be changed.

  Instead of the EDI stack (electric deionization stack) 33, a non-regenerative mixed bed ion exchange tower may be provided. In this case, deionized water can be obtained by deionizing the permeated water separated by the preceding RO membrane module with the ion exchange resin bed. In addition, immediately after the start of operation of the apparatus, deionized water whose water quality has been recovered can be supplied to the demand point. Further, by using the ion exchange tower, the power required for the treatment for obtaining deionized water from the permeated water can be made substantially zero.

  A decarboxylation device may be provided between the RO membrane module 32 and the EDI stack 33 or the non-regenerative mixed bed ion exchange tower.

  In the above-described embodiment, the example in which the voltage value of the power output from the DC power supply device 34 to the EDI stack 33 is changed as the voltage value control of the DC power supply device 34 has been described. However, the present invention is not limited to this, and the current value of power output from the DC power supply 34 to the EDI stack 33 may be changed (current value control).

  In the embodiment, the temperature sensor TS in the steam boiler 42 is provided so as to measure the feed water temperature before being passed through the discharge passage 54 (economizer 52) in the boiler feed water line L5. Not. The temperature sensor TS may measure the feed water temperature of the boiler feed water W4 after the economizer 52 is passed through.

  In the above-described embodiment, the example in which the plurality of steam boilers (stage value control boilers) 42 have the same maximum output steam amount has been described. However, the present invention is not limited to this, and the maximum output steam amount of each steam boiler 42 may be different. Moreover, also when the steam boiler 42 is a proportional control boiler, each maximum output steam amount may differ.

DESCRIPTION OF SYMBOLS 1 Warm water production system 2 Water treatment system 4 Boiler system 21 Water treatment apparatus group 22 Water treatment apparatus 25 1st system control part 31 Water treatment part 32 Reverse osmosis membrane module 33 Electrodeionization stack 35 1st local control part 36 Pressure Pump (pump)
37 Inverter 41 Steam boiler group 42 Steam boiler 45 Second system control unit 51 Boiler body 52 Economizer 53 Temperature sensor 55 Second local control unit 61 Heated water tank 62 Heat exchanger 63 Water level sensor 64 Steam trap G2 Exhaust gas L4 Steam line L6 Addition Warm water line SM1 Steam W1 Supply water W2 Treated water, desalted water W3 Heated water W4 Boiler feed water W11 First concentrated water W21 Permeated water W22 Second concentrated water W41 Steam condensed water

Claims (8)

A water treatment system comprising: a water treatment device group comprising one or more water treatment devices; and a first system control unit for designating a target flow rate value of treated water produced by the water treatment device;
A boiler system comprising: a steam boiler group including one or more steam boilers; and a second system control unit that collects an output steam amount of the steam boiler;
A heated water tank for storing heated water;
A heated water line through which treated water produced by the water treatment system circulates toward the heated water tank;
A steam line through which steam produced by the boiler system flows;
A heat exchanger for performing heat exchange between the treated water flowing through the heated water line and the steam flowing through the steam line, and heating the treated water to a predetermined temperature to obtain heated water, and
The water treatment device
A water treatment unit for obtaining treated water from the supply water;
A pump that is driven at a rotational speed according to the input driving frequency, sucks the supplied water, and discharges it toward the water treatment unit;
An inverter that outputs a driving frequency corresponding to the input frequency setting signal to the pump;
The drive frequency of the pump is calculated using the physical quantity in the system so that the production flow rate of the treated water becomes the target flow rate value specified by the first system control unit, and the frequency corresponding to the calculated value of the drive frequency A first local control unit that outputs a setting signal to the inverter;
The steam boiler is
A boiler body in which combustion is performed;
A second local control unit for burning the boiler body at a preset predetermined combustion rate,
The second system control unit calculates a steam-side heat exchange amount Qs in the heat exchanger based on the total value of the collected steam output steam steam,
The first system control unit calculates a heat exchange amount Qw on the treated water side in the heat exchanger from a heat exchange amount Qs on the steam side calculated by the second system control unit, and performs heat exchange on the treated water side. Based on the amount Qw, the flow rate of the treated water that can heat the treated water passing through the heat exchanger to a predetermined target temperature is determined, and the flow rate of the treated water is divided by the number of the water treatment device groups. Specifying the divided flow rate as the target flow rate value for the first local control unit,
Heated water production system. The second local control unit is configured to set the boiler at a combustion rate in an eco operation point that is a combustion rate at which the boiler efficiency is highest or a range of a combustion rate including the eco operation point as the predetermined combustion rate. Burn the body,
The heated water manufacturing system according to claim 1. The steam boiler is
An economizer that preheats boiler feed water with the heat of the exhaust gas through which the exhaust gas from the boiler body is passed,
A temperature sensor for measuring a water supply temperature before or after being passed through the economizer,
The second local control unit sets the eco driving point or the eco driving zone based on the measured value of the temperature sensor.
The heated water manufacturing system according to claim 2. The steam boiler is configured as a stage value control boiler that changes the combustion rate in stages,
The second local control unit burns the boiler body at a combustion rate of the eco-operation point;
The heated water manufacturing system according to claim 2 or 3. The steam boiler is configured as a proportional control boiler that continuously changes the combustion rate,
The second local control unit burns the boiler body at a combustion rate in the eco-operation zone.
The heated water manufacturing system according to claim 2 or 3. A water level sensor for detecting the water level of the heated water stored in the heated water tank;
When the detected water level value of the water level sensor is lower than a lower limit set water level, the first system control unit sends the maximum production flow rate of treated water that can be produced by the water treatment device to the first local control unit. On the other hand, when the detected water level value of the water level sensor is higher than the upper limit set water level, the minimum production flow rate of treated water that can be produced by the water treatment device is specified as the first local control unit. And (ii) based on the flow rate obtained by multiplying the target flow rate value specified for the first local control unit by the number of water treatment device groups, Calculate the heat exchange amount Qw on the treated water side required for heating the treated water passing through the exchanger to a predetermined target temperature,
The second system control unit is configured to cancel the combustion control at the predetermined combustion rate when the detected water level value of the water level sensor is lower than the lower limit set water level or higher than the upper limit set water level. (2) A steam-side heat exchange in the heat exchanger is transmitted from the treated water-side heat exchange amount Qw calculated by the first system control unit. The quantity Qs is calculated, the necessary steam quantity for obtaining the heat exchange quantity Qs on the steam side is determined, and the required steam quantity is divided by the number of the steam boiler groups at a combustion rate that becomes the output steam quantity. Transmitting a combustion rate designation signal to the second local control unit so as to burn the boiler body;
The heated water manufacturing system in any one of Claims 1-5. The water treatment unit is
A reverse osmosis membrane module for separating supply water into permeate and first concentrated water;
An electrodeionization stack that demineralizes the permeate with electric power to produce treated water and second concentrated water,
The heated water manufacturing system in any one of Claims 1-6. A steam trap provided in the steam line on the downstream side of the heat exchanger;
By mixing the steam condensate separated by the steam trap with the water supplied to the water treatment unit, the temperature of the feed water is diluted and increased.
The heated water manufacturing system in any one of Claims 1-7.

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