WO2010032406A1 - 給水制御装置 - Google Patents

給水制御装置 Download PDF

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Publication number
WO2010032406A1
WO2010032406A1 PCT/JP2009/004515 JP2009004515W WO2010032406A1 WO 2010032406 A1 WO2010032406 A1 WO 2010032406A1 JP 2009004515 W JP2009004515 W JP 2009004515W WO 2010032406 A1 WO2010032406 A1 WO 2010032406A1
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WIPO (PCT)
Prior art keywords
water
water level
blow
water supply
boiler
Prior art date
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Ceased
Application number
PCT/JP2009/004515
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English (en)
French (fr)
Japanese (ja)
Inventor
矢作陽一
浜田和寿
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Miura Co Ltd
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Miura Co Ltd
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Filing date
Publication date
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Publication of WO2010032406A1 publication Critical patent/WO2010032406A1/ja
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
    • F22B21/348—Radiation boilers with a burner at the top
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/50—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/78—Adaptations or mounting of level indicators

Definitions

  • the present invention relates to a water supply control device used for a boiler.
  • This application claims priority based on Japanese Patent Application No. 2008-238682 filed in Japan on September 17, 2008 and Japanese Patent Application No. 2009-203034 filed on September 2, 2009 in Japan. The contents are incorporated herein.
  • the can water is concentrated by impurities contained in the can water.
  • sludge and the like are generated by the impurities, and the generated sludge and the like are deposited on the bottom of the boiler can body. And accumulation of this sludge etc. has a possibility of reducing the steam generating ability in a boiler.
  • can water blow for discharging canned water, sludge and the like from the boiler can body has been regularly performed (see, for example, Patent Document 1).
  • the can water blow is performed based on the operation time of the boiler, the concentration of the can water, and the like, and usually the can water or sludge is discharged from the bottom of the boiler can body.
  • Patent Document 1 does not perform water supply control considering water level expansion due to the absence of bubbles when the water quality of the can water or the temperature of the boiler body changes. . That is, water supply control based on the same reference water level as before the can water blow was performed. Therefore, after performing can water blow, there existed a problem that there existed a possibility of causing malfunctions, such as a fall of the dryness of a vapor
  • An object of the present invention is to provide a water supply control device that can prevent a decrease in the dryness of steam and damage to a water pipe even when can water blow is performed.
  • the water supply control device of the present invention enables a boiler having a plurality of water pipes, a water supply pump that supplies water to the boiler, a control unit that controls the water supply pump to satisfy a specific water level, and drainage of the boiler. And when the boiler is drained by the blow device, the control unit has a second water level that is higher than the first water level before draining. The feed water pump is controlled so that the water level becomes the same.
  • the second water level is set based on at least the amount of drainage by the blow device.
  • the second water level is further set based on an evaporation amount generated by the boiler.
  • the present invention it is possible to provide a water supply control device that can prevent a decrease in the dryness of steam and damage of a water pipe even when can water blow is performed.
  • FIG. 1 is a schematic diagram showing a schematic configuration of a water supply control device 1 according to the first embodiment of the present invention.
  • the feed water control apparatus 1 which concerns on 1st Embodiment is the boiler main body 2, the water level detection apparatus 3, the feed water pump 4, the steam-water separator 5, the control part 6, as a boiler.
  • a first blow valve 7 as a first blow device and a second blow valve 8 as a second blow device are provided.
  • the water supply control device 1 includes a combustion amount, steam pressure, water supply temperature of water supplied from the water supply pump 4 and water introduced into the boiler body 2 (hereinafter referred to as “can”).
  • the amount of water supplied by the water supply pump 4 is adjusted according to the electrical conductivity of water), and water supply control based on the reference water level (S) as the first water level is performed.
  • the water supply control device 1 further controls the amount of water supplied by the water feed pump 4 according to the temperature of the lower header 22 described later and the electrical conductivity of the can water after the can water blow. It adjusts and performs water supply control based on the blow water level (SS) as a predetermined time and a 2nd water level.
  • the “reference water level (S)” is determined according to the combustion amount, the steam pressure, the water supply temperature of water supplied from the water supply pump 4 and the electrical conductivity of the can water during normal operation of the boiler body 2.
  • the “blow water level (SS)” is a water level higher than the reference water level (S).
  • the combustion amount, steam pressure, and feed water pump 4 of the boiler body 2 after the can water blow is performed.
  • the water level inside the water pipe 21 set according to the temperature of the water supplied from the water, the temperature of the lower header 22, and the electrical conductivity of the can water after the can water blow.
  • the boiler body 2 includes a boiler can body 20, a plurality of water pipes 21, a lower header 22, an upper header 23, and a heating burner 24.
  • the boiler can body 20 is formed in a substantially cylindrical shape and constitutes the appearance of the boiler body 2.
  • the plurality of water tubes 21 are accommodated inside the boiler can body 20 and are erected at predetermined intervals in the circumferential direction of the boiler can body 20.
  • the plurality of water tubes 21 define a combustion chamber 25 provided at a substantially central portion of the boiler can body 20. That is, the plurality of water pipes 21 are erected at predetermined intervals in the circumferential direction of the boiler can body 20 so as to surround the combustion chamber 25 inside the boiler can body 20.
  • the heating burner 24 is provided above the combustion chamber 25.
  • the heating burner 24 heats the can water introduced into the plurality of water tubes 21 to generate an air-water mixture (steam).
  • the heating burner 24 is connected to a fuel tank (not shown) through a fuel line 24a.
  • a flow rate adjusting valve 24b is provided in the fuel line 24a.
  • the combustion amount of the heating burner 24 is configured to be adjusted continuously or stepwise by adjusting the opening degree of the flow rate adjusting valve 24b.
  • the heating burner 24 is configured to be adjustable such that the opening degree of the flow rate adjusting valve 24b is 100% high combustion, the low opening degree is 50%, and the opening degree is 0% stop.
  • the lower header 22 is provided at the lower part of the boiler can body 20 and is connected to the lower ends of the plurality of water pipes 21.
  • One side of the water supply line 4a is connected to the lower header 22.
  • the water supply pump 4 connected to the water supply tank (not shown) is connected to the other side of the water supply line 4a.
  • the water stored in the water supply tank is introduced into the lower header 22 through the water supply line 40 by the water supply pump 4.
  • the water introduced into the lower header 22 is introduced into a plurality of water tubes 21 heated by the heating burner 24.
  • the boiler body 2 according to the present embodiment constitutes a so-called once-through boiler.
  • a blow line 7a capable of draining can water is connected to the lower header 22.
  • a first blow valve 7 is provided in the blow line 7a.
  • the first blow valve 7 is connected to the control unit 6 through a line 6a.
  • the water supply control device 1 causes the control unit 6 to open the first blow valve 7 at a predetermined timing to thereby introduce water (cooling water or the like) introduced by the water supply pump 4 and / or canned water introduced into the lower header 22.
  • water cooling water or the like
  • sludge or the like high concentration canned water or the like
  • the entire amount or a predetermined amount can be discharged from the lower header 22 (canned water blow).
  • the upper header 23 is provided at the upper part of the boiler can body 20 and is connected to the upper ends of the plurality of water pipes 21.
  • the upper header 23 is connected to one side of the air / water line 5a.
  • the steam separator 5 is connected to the other side of the steam line 5a.
  • the upper header 23 collects the air / water mixture (steam) generated in the plurality of water pipes 21 by the heating burner 24 and sends it to the steam / water separator 5 through the air / water line 5a.
  • the steam / water separator 5 is connected to the upper header 23 via the steam / water line 5a.
  • the steam / water separator 5 separates the steam / water mixture (steam) generated by the heating burner 24 and sent out from the upper header 23 into dry steam and moisture.
  • the steam separator 5 is connected to a steam communication line 51a connected to a predetermined device (not shown).
  • the dry steam separated by the steam separator 5 is sent out to a predetermined device through the steam communication line 51a.
  • the delivery of dry steam to a predetermined device is adjusted by opening and closing an opening / closing valve 51b provided in the steam communication line 51a.
  • the water separated by the steam separator 5 is sent out to the lower header 22 through a precipitation line 52 a that connects the steam separator 5 and the lower header 22.
  • the concentration blow line 8a is connected to the precipitation line 52a.
  • a second blow valve 8 is provided in the concentration blow line 8a.
  • the second blow valve 8 is connected to the control unit 6 through a line 6a.
  • the water supply control device 1 opens the second blow valve 8 based on a command from the control unit 6, thereby causing predetermined water (such as high-concentration can water) separated by the steam / water separator 5 to be supplied by the water supply pump 4.
  • the introduced water (cooling water or the like) and / or water at the time of starting the boiler body 2 can be drained (hereinafter referred to as “concentration blow”).
  • an electrical conductivity measurement sensor 53 is provided on the downstream side of the concentration blow line 8a in the precipitation line 52.
  • the electrical conductivity measurement sensor 53 measures the electrical conductivity of water supplied when the water supply control device 1 is started up, the electrical conductivity of canned water concentrated by long-time operation of the boiler body 2, and the like.
  • the water level detection device 3 includes a water level control cylinder 30 formed of a conductive metal, a high water level electrode rod 31, a middle water level electrode rod 32, and a low water level electrode rod 33.
  • the water level control cylinder 30 is formed in a substantially cylindrical shape with both ends sealed.
  • a communication pipe 3 a is connected to the upper end portion of the water level control cylinder 30, and the communication pipe 3 a is connected to the upper header 23.
  • a communication pipe 3 b is connected to the lower end portion of the water level control cylinder 30, and the communication pipe 3 b is connected to the lower header 22.
  • the water level control cylinder 30 has an upper end portion and a lower end portion communicating with the water pipe 21 via the upper header 23 and the lower header 22, so that the water level in the can similar to the can water introduced into the water pipe is set inside the water level control cylinder 30. Make it happen.
  • the high water level electrode rod 31 includes an external connection terminal 31 a formed on one end side and an electrode portion 31 b formed on the other end side, and detects a reference water level (S) inside the water level control cylinder 30.
  • the reference water level (S) is a target water level during normal operation of the boiler body 2.
  • the external connection terminal 31a protrudes outside the water level control cylinder 30 and is held at the upper end of the water level control cylinder 30 by a cylindrical insulator (not shown).
  • the electrode part 31 b is made of rod-shaped stainless steel and is disposed inside the water level control cylinder 30.
  • the electrode portion 31 b is formed to have a length capable of detecting the reference water level (S) of the can water introduced into the water level control cylinder 30.
  • the high water level electrode rod 31 connects the external connection terminal 31a to one side of a predetermined power supply unit (not shown) and connects the other side of the power supply unit to the water level control cylinder 30 to be in an energized state.
  • a predetermined power supply unit not shown
  • the can water inside the control cylinder 30 reaches the reference water level (S) and the electrode part 31b comes into contact with the can water, the reference water level (S) is detected.
  • the intermediate water level electrode rod 32 includes an external connection terminal 32 a provided on one end side and an electrode portion 32 b provided on the other end side, and detects the intermediate water level (M) inside the water level control cylinder 30.
  • the intermediate water level (M) is a water level that causes the boiler can body 20 to start water supply on the condition that the water inside the water level control cylinder 30 does not satisfy the intermediate water level (M).
  • the external connection terminal 32a protrudes outside the water level control cylinder 30 and is held at the upper end of the water level control cylinder 30 by a cylindrical insulator (not shown).
  • the electrode portion 32 b is formed of rod-shaped stainless steel and is disposed inside the water level control cylinder 30.
  • the electrode portion 32 b is formed to have a length capable of detecting the middle water level (M) of the can water introduced into the water level control cylinder 30.
  • the middle water level electrode rod 32 is connected to the water level control cylinder 30 by connecting the external connection terminal 32a to one side of a predetermined power source (not shown) and connecting the other side of the power source to the water level control cylinder 30, thereby When the can water inside the control cylinder 30 reaches the middle water level (M) and the electrode part 32b comes into contact with the can water, the middle water level (M) is detected.
  • the low water level electrode rod 33 includes an external connection terminal 33 a provided on one end side and an electrode portion 33 b provided on the other end side, and detects the low water level (L) inside the water level control cylinder 30.
  • the low water level (L) is a water level at which the boiler body 2 is interlocked and the operation of the boiler body 2 is stopped on condition that the water inside the water level control cylinder 30 does not satisfy the low water level (L). It is.
  • the external connection terminal 33a protrudes outside the water level control cylinder 30 and is held at the upper end of the water level control cylinder 30 by a cylindrical insulator (not shown).
  • the electrode portion 33 b is formed of rod-shaped stainless steel and is disposed inside the water level control cylinder 30. Further, the electrode portion 33 b is formed to have a length capable of detecting the low water level (L) of the canned water introduced into the water level control cylinder 30.
  • the low water level electrode rod 33 connects the external connection terminal 32a to one side of a predetermined power supply unit (not shown) and connects the other side of the power supply unit to the water level control cylinder 30 to be in an energized state.
  • a predetermined power supply unit not shown
  • the can water inside the control cylinder 30 reaches a low water level (L) and the electrode part 32b contacts the can water, the low water level (L) is detected.
  • the water supply pump 4 is connected to the lower header 22 through the water supply line 4a. Further, a check valve 4b is provided in the water supply line 4a. The check valve 4b prevents water from flowing backward from the lower header 22 to the feed pump 4 side.
  • a chemical injection tank (not shown) is connected between the water supply pump 4 and the water supply tank (not shown) via a chemical injection pump (not shown), and the electrical conductivity of the can water Accordingly, a predetermined medicine can be injected into the lower header 22.
  • the control unit 6 includes a water supply pump 4, a first blow valve 7, a second blow valve 8, a flow rate adjusting valve 24b, a high water level electrode rod 31, a middle water level electrode rod 32, a low water level electrode rod 33, and a line 6a.
  • the electrical conductivity measurement sensor 53 is connected.
  • the control unit 6 starts and stops the water supply pump 4 based on the detection results of the high water level electrode rod 31, the middle water level electrode rod 32, and the low water level electrode rod 33, and opens and closes the first blow valve 7 when can water is blown. Opening and closing of the second blow valve 8 at the time of the concentration blow based on the electric conductivity input by the electric conductivity measuring sensor 53, adjustment of the flow rate adjustment valve 24b for adjusting the fuel supplied to the heating burner 24, etc. Predetermined control is performed based on each condition.
  • the water supply control of the water supply control device 1 according to the first embodiment is performed based on the water level in the can inside the water level control cylinder 30 that satisfies the same water level as the water level of the can water introduced into the water pipe 21.
  • the water level in the can inside the water level control cylinder 30 is lowered to the middle water level (M)
  • the lower end of the electrode portion 33b of the middle water level electrode rod 32 does not come into contact with the can water.
  • a signal indicating that the water level detection device 3 does not satisfy the middle water level (M) is transmitted from the water level detection device 3 to the control unit 6 via the line 6a.
  • the control unit 6 activates the water supply pump 4 and starts water supply into the boiler can body 20.
  • the water supply pump 4 starts water supply into the boiler can body 20.
  • the water level inside the can inside the water level control cylinder 30 rises accordingly.
  • the water level in the can inside the water level control cylinder 30 rises to the reference water level (S)
  • the lower end of the electrode part 31b of the high water level electrode rod 31 comes into contact with the can water.
  • the high water level electrode rod 31 detects the reference water level (S).
  • the high water level detection electrode rod 31 detects the reference water level (S)
  • a signal indicating that the water level in the can has risen to the reference water level (S) is transmitted from the water level detection device 3 to the control unit 6 via the line 6a.
  • the control unit 6 stops the water supply pump 4.
  • the water supply control device 1 repeats the water supply control described above for the water level in the can that increases or decreases due to the generation of steam until the stop operation of the boiler body 2 is performed by the user.
  • the low water level (L) in the water level in the can is the limit water level of the boiler body 2, and when the water level in the can becomes lower than the low water level (L), the control unit 6 outputs a water level abnormality. Then, the boiler body 2 is interlocked and the operation of the boiler body 2 is stopped.
  • FIG. 2 is a flowchart showing the water supply control process related to the can water blow of the water supply control apparatus 1 according to the first embodiment.
  • the water supply control device 1 according to the first embodiment performs can water blow based on the passage of a predetermined operation time of the boiler body 2.
  • the water supply control device 1 determines whether or not can water blow is necessary from the state where water supply control based on the reference water level (S) during normal operation is performed (step S10).
  • whether or not the can water blow is necessary is determined based on the operating time of the boiler body 2 in principle.
  • the determination as to whether or not the can water blow is necessary may be made based on the concentration of the can water in addition to the operation time of the boiler body 2.
  • step S15 if it is determined that the can water blow is necessary due to the elapse of a predetermined operation time, the process proceeds to step S20, and the boiler body 2 is stopped. On the other hand, if it is determined that the can water blow is unnecessary, the process returns to step S10, and the reference water level control with the reference water level (S) as the target water level is continued until the can water blow is necessary.
  • step S20 when the boiler main body 2 is stopped, the water supply control device 1 causes the control unit 6 to open the first blow valve 7 in a full amount or a predetermined amount (step S25), and from the boiler can body 20 (lower header 22) to the can. Let the water drain. Thereby, sludge etc. are discharged
  • the water supply control apparatus 1 which concerns on this embodiment can perform either the whole blow which drains the whole quantity of can water, or the half blow which drains the half of can water. For example, when full blow is performed, all sludge and the like can be discharged. On the other hand, when half blow is performed, for example, sludge and the like can be discharged without greatly reducing the ph of the can water.
  • the water supplied by the water supply pump 4 may be introduced into the blow line 7a and mixed with the can water to be discharged.
  • the water supplied by the water supply pump 4 may be introduced into the blow line 7a and mixed with the can water to be discharged.
  • step S30 when drainage from the first blow valve 7 is completed, the control unit 6 closes the first blow valve 7 (step S40), and drains from the boiler can body 20 (lower header 22). To stop.
  • the water supply control device 1 sets the blow water level (SS) (step S45).
  • SS blow water level
  • the blow water level (SS) is the amount of combustion during operation of the boiler body 2, the steam pressure, the temperature of the water supplied from the water supply pump 4, the electrical conductivity of the can water, and the temperature of the lower header 22.
  • the control unit 6 When the blow water level (SS) is set in step S45, the control unit 6 operates the water supply pump 4 (step S50) and starts water supply to the boiler can body 20 (lower header 22).
  • the water supply control device 1 controls the water level in the can based on the blow water level (SS) by adjusting the amount of water supplied by the water supply pump 4. That is, the control is performed so that the blow water level (SS) whose water level is higher than the reference water level (S) is the target water level (step S55).
  • step S55 when the can water inside the water level control cylinder 30 rises to the blow water level (SS) and the in-can water level satisfies the blow water level (SS), the water supply control device 1 stops the water supply pump 4 (step S55). S60), water supply is terminated.
  • the feed water pump 4 operates until the blow water level (SS) is satisfied, and feeds water to the boiler can body 20 (lower header 22).
  • the feed water control device 1 starts the boiler body 2 (step S65) and starts generating steam.
  • step S70 When the generation of steam based on the blow water level (SS) is performed for a predetermined time (T seconds) (step S70), the can water inside the water level control cylinder 30 is boiled and bubbles are generated. Therefore, the feed water control device 1 sets the reference water level (S) according to the combustion amount, steam pressure, feed water temperature of water fed from the feed water pump 4 and electrical conductivity of the can water during operation of the boiler body 2. (Step S75).
  • step S75 when the reference water level (S) is set by the water supply control device 1, the water supply control device 1 changes the target water level from the blow water level (SS) to the reference water level (S), and sets the reference water level (S) as the target.
  • a normal operation based on the reference water level control for the water level is performed (step S80).
  • the water supply control apparatus 1 in 1st Embodiment performs a blow (concentration blow) also when canned water stops satisfy
  • FIG. Concentration blow is performed by opening and closing the second blow valve 8.
  • the electrical conductivity measurement sensor 53 transmits a predetermined control signal to the control unit 6.
  • the control unit 6 receives the control signal transmitted from the electrical conductivity measurement sensor 53, the control unit 6 opens the second blow valve 8, drains high-concentration canned water and the like, and simultaneously activates the water supply pump 4. Then, water supply to the lower header 22 is started.
  • water supply adjusts the water supply amount by the water supply pump 4 according to the combustion amount at the time of the operation
  • the control part 6 stops the feed water pump 4 and closes the 2nd blow valve 8, and the concentration blow water level
  • the water supply control based on is terminated, and the water supply control is newly performed based on the reference water level (S).
  • the water level control device 1 is configured such that when the water quality of the can water or the temperature of the boiler can body changes due to the can water blow, the combustion amount, the steam pressure, the feed water pump during the operation of the boiler body 2
  • the water supply amount by the water supply pump 4 is adjusted according to the water supply temperature of water supplied from 4, the electrical conductivity of the can water, and the temperature of the lower header 22, and water supply control based on the blow water level (SS) is performed. That is, water supply control is performed at a higher water level than the reference water level (S), which is different from the control based on the reference water level (S), taking into account the water level expansion due to the absence of bubbles and the like. For this reason, it is possible to prevent overheating of the water pipe or the like due to insufficient water level such as the absence of bubbles. This makes it possible to prevent damage to the water pipe.
  • an appropriate blow water level is detected based on the combustion amount, steam pressure, water supply temperature of water supplied from the feed water pump 4, electric conductivity of can water, and the temperature of the lower header 22 during operation of the boiler body 2.
  • the water supply pump 4 can be used without applying an unnecessary load to the water supply pump. Thereby, the failure of the feed water pump 4 can be suppressed, and the life of the feed water pump 4 can be increased.
  • FIG. 3 is a schematic diagram showing a schematic configuration of a water level control apparatus 1A according to the second embodiment of the present invention.
  • the water supply control device 1 ⁇ / b> A according to the second embodiment includes a second water level detection electrode rod 32 ⁇ / b> A accommodated in the water pipe 21.
  • the second water level is based on the drainage amount of the can water drained from the water pipe 21 containing the second water level detection electrode rod 32A and the evaporation amount of the can water evaporated from the water pipe 21.
  • the blow water level (SS) is set, and water supply control based on the blow water level (SS) is performed using the second water level detection electrode rod 32A.
  • the water supply control device 1A is configured such that, during normal operation, the combustion amount, steam pressure, water supply temperature of water supplied from the water supply pump 4, and boiler main body during operation of the boiler main body 2 In accordance with the electrical conductivity of the water introduced in 2 (hereinafter referred to as “canned water”), the amount of water supplied by the water supply pump 4 is adjusted, and water supply control based on the reference water level (S) is performed. In the case where the can water blow is performed, the water supply control device 1A further discharges the can water drained from the water pipe 21 (the drain amount of the can water drained from the boiler body 2) and the combustion state of the heating burner 24.
  • the water supply control device 1A further discharges the can water drained from the water pipe 21 (the drain amount of the can water drained from the boiler body 2) and the combustion state of the heating burner 24.
  • the water supply amount by the water supply pump 4 is adjusted, and the blow water level is set for a predetermined time.
  • Water supply control based on (SS) is performed.
  • the “blow water level (SS)” is a boiler for canned water in the water pipe 21 according to the amount of canned water drained from the water pipe 21 (boiler body 2) and the combustion state of the heating burner 24. It refers to the water level inside the water pipe that is set based on the amount of evaporation generated by the main body 2. Also, the evaporation amount is the amount of water that can change steam per unit time in the boiler body 2.
  • the water supply control device 1A includes a boiler body 2, a water level detection device 3A, a water supply pump 4, a steam / water separator 5, a control unit 6A, and a first blower.
  • the water level detection device 3 ⁇ / b> A includes a water level control cylinder 30 formed of a conductive metal, a first water level detection electrode bar 34 accommodated in the water level control cylinder 30, and a second water level detection electrode bar 35 accommodated in the water pipe 21. And comprising.
  • the first water level detection electrode rod 34 includes an external connection terminal 34 a formed on one end side and a water level detection electrode portion 34 b formed on the other end side, and a specific water level (reference) inside the water level control cylinder 30. Water level (S), medium water level (M), low water level (L), etc.) are detected.
  • the external connection terminal 34a protrudes outside the water level control cylinder 30 and is held at the upper end of the water level control cylinder 30 by a cylindrical insulator (not shown).
  • the water level detection electrode part 34 b is formed of rod-shaped stainless steel and is disposed inside the water level control cylinder 30.
  • the surface of the water level detection electrode part 34b is covered with an insulating film made of engineer plastic.
  • the insulating film for example, engineer plastic with high heat resistance, high pressure resistance and high chemical resistance is preferable, and ketone-based synthetic resin materials such as polyether ether ketone, polyether ketone, polyether ketone ketone, polyallyl ether ketone, Or polyether ether ketone with high heat resistance can be illustrated.
  • the water level detection electrode part 34 b is formed in a predetermined length capable of detecting a specific water level of the canned water introduced into the water level control cylinder 30.
  • the first water level detection electrode rod 34 is connected to an external connection terminal 34a to one side of a predetermined power supply unit (not shown), and the other side of the power supply unit is connected to the metal water level control cylinder 30 to be in an energized state.
  • the contact portion of the water level detection electrode portion 34b in contact with the can water inside the water level control cylinder 30 serves as a capacitor, and the insulating film coated on the surface of the water level detection electrode portion 34b is used as a dielectric, and the water level detection electrode portion Capacitance between 34b and the water level control cylinder 30 can be measured.
  • the water level of the can water in the inside of the water level control cylinder 30 is detected with the measured electrostatic capacitance.
  • the second water level detection electrode rod 35 includes an external connection terminal 35a formed on one end side and an electrode portion 35b formed on the other end side, and detects the blow water level (SS) inside the water pipe 21.
  • the external connection terminal 35a protrudes outside the water tube 21 and is held at the upper end of the water tube 21 by a cylindrical insulator (not shown).
  • the electrode part 35 b is formed of a rod-shaped stainless steel and is disposed inside the water tube 21. Moreover, the electrode part 35b is formed in the predetermined
  • SS blow water level
  • the second water level detection electrode bar 35 is connected to the external connection terminal 35a on one side of a predetermined power supply unit (not shown) and the other side of the power supply unit is connected to the metal water pipe 21 to be in an energized state.
  • a predetermined power supply unit not shown
  • the other side of the power supply unit is connected to the metal water pipe 21 to be in an energized state.
  • the control unit 6A is connected to the water supply pump 4, the first blow valve 7, the second blow valve 8, the flow rate adjustment valve 24b, the first water level detection electrode bar 34, the second water level detection electrode bar 35, and the electric conduction via the line 6a. It is connected to the degree measuring sensor 53.
  • the control unit 6A starts and stops the water supply pump 4 based on the detection results of the first water level detection electrode rod 34 and the second water level detection electrode rod 35, opens and closes the first blow valve 7 when can water is blown, and electrical conduction.
  • Predetermined opening / closing of the second blow valve 8 at the time of the concentration blow based on the electric conductivity input by the degree measurement sensor 53 and the opening adjustment of the flow rate adjusting valve 24b for adjusting the fuel supplied to the heating burner 24, etc. Control is performed based on each condition.
  • the water supply control of the water supply control device 1A according to the second embodiment is performed based on the water level in the can of the water level control cylinder 30 and the water level in the can of the water pipe 21 detected by the water level detection device 3A.
  • the control unit 6A When a signal indicating that the middle water level (M) is not satisfied is transmitted from the water level detection device 3A, the control unit 6A operates the water supply pump 4 and starts water supply to the inside of the boiler can body 20. When water supply to the inside of the boiler can body 20 is started by the water supply pump 4, the water level in the can inside the water pipe 21 starts to rise.
  • the water level inside the can inside the water level control cylinder 30 rises accordingly.
  • the energization state of the water level detection electrode portion 34b in the water level detection device 3A changes, and the water level detection device 3A enters the energization state of the water level detection electrode portion 34b. Is detected to indicate the reference water level (S).
  • the water level detection electrode unit 34b transmits a signal indicating that the reference water level (S) is satisfied to the control unit 6A.
  • the control unit 6A stops the water supply pump 4.
  • the water supply control device 1 ⁇ / b> A repeats the water supply control described above for the water level in the can that increases or decreases due to the generation of steam until the user performs a stop operation of the boiler body 2.
  • the low water level (L) in the water level in the can is the limit water level of the boiler body 2, and when the energized state of the water level detection electrode unit 34b indicates the low water level (L) or less, the control unit 6 indicates that the water level is abnormal.
  • the boiler body 2 is interlocked to stop the operation of the boiler body 2.
  • FIG. 4 is a flowchart showing a water supply control process related to can water blow of the water supply control apparatus 1A according to the second embodiment.
  • the water supply control device 1A determines whether or not can water blow is necessary (step S115) from the state where water supply control based on the reference water level (S) during normal operation is performed (step S110).
  • whether or not the can water blow is necessary is determined based on the operating time of the boiler body 2 in principle.
  • the determination as to whether or not the can water blow is necessary may be made based on the concentration of the can water in addition to the operation time of the boiler body 2.
  • step S115 if it is determined that the can water blow is necessary due to the elapse of the predetermined operation time, the process proceeds to step S120. On the other hand, when it is determined that the can water blow is unnecessary, the process returns to step S110, and the reference water level control with the reference water level (S) as the target water level is continued until the can water blow is necessary.
  • the water supply control device 1A causes the control unit 6A to open the first blow valve 7 in a full amount or a predetermined amount (step S120) and drain the can water from the boiler can body 20 (lower header 22). Thereby, sludge etc. are discharged
  • step S125 when drainage from the first blow valve 7 is completed, the control unit 6A closes the first blow valve 7 (step S130) and stops drainage from the boiler can body 20 (lower header 22). .
  • the water supply control device 1 sets the blow water level (SS) (step S135).
  • the blow water level (SS) is a reference water level based on the amount of can water drained from the boiler body 2 (water pipe 21) and the amount of can water evaporated (in the water pipe 21) according to the combustion state of the heating burner 24.
  • the water level is set higher than (S).
  • the blow water level (SS) is set based on the water level corresponding to the case where the amount of drainage and evaporation of the can water is supplied to the boiler body 2.
  • step S135 When the blow water level (SS) is set in step S135, the control unit 6A operates the water supply pump 4 (step S140) and starts water supply to the boiler can body 20 (lower header 22).
  • step S140 When water supply by the water supply pump 4 is started, the water supply control device 1 controls the water level in the can based on the blow water level (SS) by adjusting the amount of water supplied by the water supply pump 4 (step S145).
  • step S145 when the can water in the water level control cylinder 30 rises to the blow water level (SS) and the in-can water level satisfies the blow water level (SS), the water supply control device 1A stops the water supply pump 4 (step S145). S150), water supply is terminated.
  • the water supply control device 1A When the blow water level (SS) is satisfied by the water supply pump 4, the water supply control device 1A performs control based on the blow water level (SS) for a predetermined time (T seconds).
  • the canned water inside the water level control cylinder 30 is boiled and bubbles are generated, so the water supply control device 1A operates the boiler body 2
  • the reference water level (S) is set according to the combustion amount at the time, the steam pressure, the temperature of the water supplied from the water supply pump 4 and the electrical conductivity of the can water (step S160).
  • step S160 when the reference water level (S) is set by the water supply control device 1A, the water supply control device 1A changes the target water level from the blow water level (SS) to the reference water level (S), and the reference water level (S).
  • the normal operation based on the reference water level control with the target water level as the target water level is performed (step S165).
  • the water supply control device 1A has a blow water level (SS) based on the drainage amount of can water drained from the water pipe 21 containing the second water level detection electrode rod 32A and the evaporation amount of can water evaporated from the water pipe 21.
  • SS blow water level
  • water supply control based on the blow water level (SS) is performed using the second water level detection electrode rod 32A.
  • the lower header 22 may be damaged.
  • the can water in the water pipe 21 has an appropriate electrical conductivity. Therefore, the water level of the can water in the water pipe 21 needs to be an appropriate water level.
  • the water supply control device 1A according to the second embodiment determines the blow water level based on the amount of drainage and the amount of evaporation. That is, by replenishing substantially the same amount of can water as the drainage and evaporated can water, the water level of the water pipe 21 can be easily set to an appropriate water level that is higher than the reference water level. Thereby, for example, it is possible to prevent the lower header 22 from being damaged and the concentration of the can water from becoming an inappropriate concentration.
  • the embodiment of the present invention is not limited to the above-described embodiments (first embodiment and second embodiment), and the technical scope of the present invention is not limited to these.
  • the effects described in the embodiments of the present invention are merely the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the above embodiments.
  • the water supply control when the water supply control device 1 performs the can water blow is performed with the boiler body 2 stopped, but the present invention is not limited thereto.
  • the water supply control when the canned water blow is performed by the water supply control device 1 may be performed during the combustion of the boiler body 2.
  • the water supply control device 1 is configured to perform either full blow or half blow.
  • the water supply control device may be configured to drain a predetermined amount of can water. In this case, for example, when the blow rate is 20%, the evaporation amount (the evaporation amount of can water based on the combustion state (high combustion state or low combustion state) of the heating burner 24) is 0.2 (20%). The amount multiplied by may be used as the amount of drainage.
  • the water level in the can is detected by the change in the energization state using the high water level electrode rod 31, the middle water level electrode rod 32, and the low water level electrode rod 33.
  • the water level detection electrode rod may be configured to detect the water level by measuring capacitance. That is, the water level detection electrode rod only needs to detect the water level in the water level control cylinder 30.
  • a plurality of water tubes 21 are erected at a predetermined interval in the circumferential direction of the boiler can body 20, and a combustion chamber 25 is provided in a substantially central portion, and the combustion chamber 25 is positioned above the combustion chamber 25.
  • the present invention is not limited to this.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
PCT/JP2009/004515 2008-09-17 2009-09-11 給水制御装置 Ceased WO2010032406A1 (ja)

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JP2008-238682 2008-09-17
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JP5593906B2 (ja) * 2010-07-16 2014-09-24 富士電機株式会社 ヒートポンプ式蒸気生成装置
JP5648789B2 (ja) * 2010-08-26 2015-01-07 三浦工業株式会社 ボイラ
JP5362665B2 (ja) * 2010-08-31 2013-12-11 川重冷熱工業株式会社 ボイラの自動ブロー制御方法及び装置
JP5671915B2 (ja) * 2010-09-29 2015-02-18 三浦工業株式会社 ボイラ装置
JP5632786B2 (ja) * 2011-03-31 2014-11-26 バブコック日立株式会社 排熱回収ボイラ
JP2014219117A (ja) * 2013-05-01 2014-11-20 三浦工業株式会社 ボイラ
JP6098339B2 (ja) * 2013-05-01 2017-03-22 三浦工業株式会社 ボイラシステム
JP7764777B2 (ja) * 2022-02-10 2025-11-06 三浦工業株式会社 ボイラ

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JPS6291704A (ja) * 1986-06-13 1987-04-27 三浦工業株式会社 多管式貫流ボイラ−における二連水位を用いた缶体過熱防止装置
JPH03236502A (ja) * 1990-02-14 1991-10-22 Takuma Co Ltd ボイラの水位制御方法
JPH06101805A (ja) * 1992-09-21 1994-04-12 Miura Co Ltd 水管内電極による水位制御機構
JPH07293806A (ja) * 1994-04-27 1995-11-10 Miura Co Ltd 純水仕様ボイラの水位制御方法

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS6291704A (ja) * 1986-06-13 1987-04-27 三浦工業株式会社 多管式貫流ボイラ−における二連水位を用いた缶体過熱防止装置
JPH03236502A (ja) * 1990-02-14 1991-10-22 Takuma Co Ltd ボイラの水位制御方法
JPH06101805A (ja) * 1992-09-21 1994-04-12 Miura Co Ltd 水管内電極による水位制御機構
JPH07293806A (ja) * 1994-04-27 1995-11-10 Miura Co Ltd 純水仕様ボイラの水位制御方法

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