JP5277835B2 - Water supply control device - Google Patents

Abstract

A water supply control device comprises water level detection electrodes installed in a water tube stored in a boiler body and capable of detecting specific water levels inside the water tube, a water feed pump for feeding water into the boiler body, and a control part for controlling the start and stop of the water feed pump. The control part suitably starts the water feed pump when the water level detection electrode detects the specific water level, determines the start time of the water feed pump according to the pressure in the water tube and the temperature of the water fed into the water tube, and stops the water feed pump after the start time is elapsed.

Description

  The present invention relates to a water supply control device.

  Conventionally, in a boiler apparatus, the water level in the water pipe (hereinafter referred to as “canned water”) is used to prevent overheating of the water pipe, which is a heat transfer section, and to make the generated steam have a predetermined dryness. Water supply control is performed to maintain (hereinafter referred to as “in-pipe water level”) within a predetermined range. In such water supply control, a water level detection electrode rod is usually used, and the water level detection electrode rod detects the in-pipe water level by directly or indirectly contacting with the can water of the boiler device. The boiler device is configured such that a specific pipe water level is detected by the water level detection electrode rod, and the pipe water level is maintained within a predetermined range based on the detected pipe water level.

  However, in the above boiler apparatus, for example, during operation of the heating burner, the can water boils and a large amount of large bubbles are generated inside the water pipe. For this reason, when the water level detection electrode rod is attached to the water pipe and the water level in the pipe is directly detected, the water level detection electrode bar may come into contact with the air bubbles to detect a water level higher than the actual water level in the pipe. Thereby, even if the boiler device does not satisfy the target water level, the target water level is detected by the water level detection electrode rod, and there is a possibility that the water pipe is damaged due to insufficient water level.

In response to this, a technique is disclosed in which water is supplied until a predetermined time elapses so that the water level in the pipe reaches the target water level after the specific water level is detected by the water level detection electrode rod mounted inside the water pipe. (For example, refer to Patent Document 1). The boiler apparatus described in Patent Document 1 raises the actual water level to the target water level by supplying water until a predetermined time elapses even when the water level detection electrode rod detects a water level higher than the actual water level. It becomes possible.
JP-A-7-127810

  By the way, the boiler apparatus may be repeatedly activated and stopped in a short time depending on the type of steam-use equipment to be connected and the operation status. In such a case, for example, when the boiler apparatus is stopped, the boiling of the can water is stopped and the large bubbles disappear, so the water level detection electrode rod detects the actual water level. Thus, if water is supplied until a predetermined time has elapsed after the specific water level is detected by the water level detection electrode rod, the water level becomes higher than the target water level. And if a boiler apparatus was started with a high water level, since can water boiled in the state where the in-pipe water level was high, there existed a problem that can water was accompanied and flowed out with steam and the dryness of steam fell.

  On the other hand, during operation of the boiler device, since the can water boils and a large amount of large bubbles are generated, water is supplied until a predetermined time elapses after a specific water level is detected by the water level detection electrode rod. This makes it possible to satisfy the target water level. However, the water supply time varies depending on the situation of the can water. Therefore, unless the water supply time based on the state of the can water is set, there is a problem that the water level may not be reached and the water pipe may be damaged, or steam having a low dryness may be generated.

  This invention is made | formed in view of the said problem, Comprising: It aims at providing the water supply control apparatus which can prevent the fall of the dryness of the vapor | steam produced | generated, and the failure | damage of a water pipe.

Water supply control apparatus of the present invention includes a heating burner for injecting a flame, is mounted in the water tubes accommodated in the boiler body, the first water level detecting electrode bars capable of detecting a particular level of the interior of the water pipe and the second water level A detection electrode rod , a water supply pump for supplying water to the boiler can body, and a control unit for controlling the start and stop of the water supply pump, wherein the first water level detection electrode rod is the heating burner of the water pipe. The first water pipe disposed near the first water pipe is installed in a place where it is likely to overheat, and the second water level detection electrode rod is directly exposed to a flame injected from the heating burner. The two water pipes are mounted, and the control unit activates the water supply pump when the first water level detection electrode bar or the second water level detection electrode bar detects the specific water level, and the pressure of the water pipe and the Water is supplied to the water pipe Based on the water temperature to determine the start time of the water supply pump, and wherein the stopping the water supply pump after the lapse of the start-up time.

Also, the water supply control apparatus of the present invention includes a heating burner for injecting a flame, is mounted in the water tubes accommodated in the boiler body, the first water level detecting electrode bars capable of detecting a particular level of the interior of the water pipe and the Two water level detection electrode rods , a water supply pump for supplying water to the boiler can body, and a control unit for controlling the start and stop of the water supply pump, the first water level detection electrode rod, A first water pipe arranged in the vicinity of the heating burner, which is attached to a first water pipe arranged in a place where overheating is likely to occur, and the second water level detection electrode rod is directly exposed to a flame injected from the heating burner. The control unit is attached to a second water pipe that hits, and the control unit activates the water supply pump when the first water level detection electrode rod or the second water level detection electrode rod does not detect the specific water level. said first water level detector When Gokubo or the second water level detecting electrode bars detects the specific water level, together with the pressure of the water pipe and on the basis of the water supplied by the feed water temperature in the water pipe, determining the feed pump startup time after the detection, The water supply pump is stopped after the start-up time has elapsed.

  ADVANTAGE OF THE INVENTION According to this invention, the water supply control apparatus which can prevent the fall of the dryness of the produced | generated vapor | steam and the failure | damage of a water pipe can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[1] 1st Embodiment First, the boiler apparatus 1 with which the water supply control apparatus 5 which concerns on 1st Embodiment of this invention is mounted | worn with reference to FIG. 1 is demonstrated. FIG. 1 is a schematic diagram illustrating a schematic configuration of a boiler apparatus having a water supply control device according to a first embodiment of the present invention. As shown in FIG. 1, the boiler device 1 is mainly composed of a boiler body 2, a steam / water separator 3, a water level detection device 4, and a water supply control device 5.

  The boiler device 1 according to the present embodiment can perform so-called double water level control by using the water level detection device 4 and the water supply control device 5 described in detail later. Moreover, in this embodiment, the boiler apparatus 1 is mounted | worn with the 1st water level detection electrode rod 6 with which the 1st water pipe 21a is mounted | worn as the electrode rod for 2 stations in the water supply control apparatus 5, and the 2nd water pipe 21b. Water supply control is performed using the second water level detection electrode rod 7. In addition, the 1st water level detection electrode rod 6 and the 2nd water level detection electrode rod 7 are mounted | worn with the 1st water pipe 21a and the 2nd water pipe 21b which are the water pipes which are easy to heat in the boiler main body 2, respectively. For example, it attaches to the water pipe which the flame injected from the heating burner 20 directly hits.

  The boiler body 2 includes a boiler can 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 plurality of water tubes 21 to boil and vaporize 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. For example, 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 8a is connected to the lower header 22, and the water supply pump 8 connected to a water supply tank (not shown) is connected to the other side of the water supply line 8a. Water stored in the water supply tank is introduced into the lower header 22 by the water supply pump 8 through the water supply line 8a. The water introduced into the lower header 22 is further introduced into a plurality of water pipes 21 connected to the lower header 22. Thus, the boiler apparatus 1 which concerns on this embodiment comprises what is called a once-through boiler.

  In addition, a blow line 22 a is connected to the lower header 22. The blow line 22a is provided with a blow valve 22b. The lower header 22 is configured to be able to discharge all or a predetermined amount of water introduced by the water supply pump 8 and / or can water introduced into the lower header 22 by opening the blow valve 22b.

  The upper header 23 is provided on the upper portion 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 a steam / water line 23a, and the steam / water separator 3 is connected to the other side of the steam / water line 23a. The upper header 23 collects the air / water mixture (steam) generated by the plurality of water pipes 21 by the heating burner 24 and sends it to the steam / water separator 3 through the air / water line 23a.

  The steam / water separator 3 is connected to the upper header 23 via a steam / water line 23a. The steam separator 3 separates dry steam and moisture from the steam / water mixture (steam) generated by the heating burner 24 and sent out from the upper header 23. The steam separator 3 is connected to a steam communication line 31a connected to a predetermined steam use device (not shown). The dry steam separated by the steam separator 3 is sent to a predetermined steam using device via the steam communication line 31a. Note that the amount of dry steam delivered to a predetermined steam-using device is adjusted by opening / closing an opening / closing valve 31b provided in the steam communication line 31a.

  On the other hand, the water separated by the steam separator 3 is sent out to the lower header 22 through a precipitation line 32 a that connects the steam separator 3 and the lower header 22. Here, the concentration blow line 33a is connected to the precipitation line 32a. The concentration blow line 33a is provided with a concentration blow valve 33b. The boiler device 1 is configured to drain predetermined water (high-concentration can water, etc.) separated by the steam / water separator 3 and / or water at the start-up of the boiler device 1 by opening the concentration blow valve 33b. Has been. In addition, an electrical conductivity measurement sensor 34 is provided downstream of the concentration blow line 33a in the precipitation line 32a. The electrical conductivity measurement sensor 34 measures the electrical conductivity of water supplied when the boiler device 1 is started up, the concentration of can water concentrated by long-time operation of the boiler device 1, and the like.

  The water level detection device 4 includes a water level control cylinder 40 formed of a conductive metal, a high water level electrode rod 41, a middle water level electrode rod 42, a low water level electrode rod 43, and a control unit (not shown). It is prepared for. The water level detection device 4 is controlled based on the in-pipe water levels of the plurality of water pipes 21 indirectly detected by the high water level electrode rod 41, the middle water level electrode rod 42 and the low water level electrode rod 43 inside the water level control cylinder 40. The water supply pump 8 is started and stopped by the unit.

  The water level control cylinder 40 is formed in a substantially cylindrical shape with both ends sealed. A communication pipe 4 a is connected to the upper end portion of the water level control cylinder 40, and the communication pipe 4 a is connected to the upper header 23. A communication pipe 4 b is connected to the lower end of the water level control cylinder 40, and the communication pipe 4 b is connected to the lower header 22. The water level control cylinder 40 has an upper end and a lower end communicating with the plurality of water pipes 21 via the upper header 23 and the lower header 22, thereby controlling the water level in the pipe similar to the can water introduced into the plurality of water pipes 21. It is realized inside the tube 40.

  The high water level electrode rod 41 detects the high water level inside the water level control cylinder 40. The high water level is a target water level when water is supplied during normal operation of the boiler body 2. That is, when the high water level electrode rod 41 and the can water come into contact with each other, the water level detection device 4 detects the high water level and stops water supply by the water supply pump 8. The high water level electrode rod 41 includes an external connection terminal 41a provided on one end side and an electrode portion 41b provided on the other end side. The high water level electrode rod 41 is disposed so that the external connection terminal 41a protrudes outside the water level control cylinder 40 and the electrode portion 41b is accommodated inside the water level control cylinder 40, and is a cylindrical insulator (not shown). To the upper end of the water level control cylinder 40.

  The high water level electrode rod 41 has an external connection terminal 41a connected to one side of a predetermined power supply unit (not shown), and an electrode unit 41b formed of a stainless steel rod. The other side of the predetermined power supply unit is connected to the water level control cylinder 40. Therefore, for example, when the water inside the water level control cylinder 40 reaches a high water level and the electrode part 41b comes into contact with the can water, the energization state between the external connection terminal 41a and the water level control cylinder 40 changes. Thereby, a high water level is detected.

  The middle water level electrode rod 42 detects the middle water level inside the water level control cylinder 40. The medium water level means that the water supply to the boiler body 20 is started on the condition that the medium water level electrode rod 42 and the can water do not come into contact with each other (the can water inside the water level control cylinder 40 does not satisfy the medium water level). The water level is controlled. The middle water level electrode rod 42 includes an external connection terminal 42a provided on one end side and an electrode portion 42b provided on the other end side. The middle water level electrode rod 42 is disposed so that the external connection terminal 42a protrudes outside the water level control cylinder 40 and the electrode portion 42b is accommodated inside the water level control cylinder 40, and is a cylindrical insulator (not shown). To the upper end of the water level control cylinder 40.

  In addition, the intermediate water level electrode rod 42 has an external connection terminal 42a connected to one side of a predetermined power source (not shown), and an electrode portion 42b made of stainless steel in a rod shape. The other side of the predetermined power supply unit is connected to the water level control cylinder 40. Therefore, for example, when the water inside the water level control cylinder 40 decreases from the middle water level and the electrode part 42b does not contact the can water, the energization state between the external connection terminal 42a and the water level control cylinder 40 changes. . Thereby, the middle water level is detected.

  The low water level electrode rod 43 detects the low water level inside the water level control cylinder 40. The low water level means that the boiler body 2 is interlocked on the condition that the low water level electrode rod 43 and the can water do not come into contact with each other (the water inside the water level control cylinder 40 does not satisfy the low water level). This is the water level at which control for stopping the operation of the boiler body 2 is performed. The low water level electrode rod 43 includes an external connection terminal 43a provided on one end side and an electrode portion 43b provided on the other end side. The low water level electrode rod 43 is arranged so that the external connection terminal 43a protrudes outside the water level control cylinder 40 and the electrode portion 43b is accommodated inside the water level control cylinder 40, and is a cylindrical insulator (not shown). To the upper end of the water level control cylinder 40.

  The low water level electrode rod 43 has an external connection terminal 43a connected to one side of a predetermined power source (not shown), and an electrode portion 43b formed of a stainless steel rod. The other side of the predetermined power supply unit is connected to the water level control cylinder 40. Therefore, for example, when the water inside the water level control cylinder 40 decreases from the low water level and the electrode portion 43b does not come into contact with the can water, the energization state between the external connection terminal 43a and the water level control cylinder 40 changes. . Thereby, a low water level is detected.

  The control unit is connected to the high water level electrode rod 41, the middle water level electrode rod 42, the low water level electrode rod 43, and the water supply pump 8 via a predetermined line (not shown). Based on the in-pipe water levels of the plurality of water pipes 21 indirectly detected by the high water level electrode rod 41, the middle water level electrode rod 42, and the low water level electrode rod 43 inside the water level control cylinder 40, the control unit 8 Controls start and stop of. Specifically, the control unit activates the water supply pump 8 and starts supplying water to the boiler can body 20 on the condition that the middle water level electrode rod 42 and the can water do not contact with each other inside the water level control cylinder 40. Let And when the water level of the water level control cylinder 40 rises by water supply and the high water level electrode rod 41 and can water contact, the water supply pump 8 will be stopped and water supply will be stopped. Moreover, a control part performs the control which puts an interlock etc. on the boiler main body 2 and stops the operation | movement of the boiler main body 2 on condition that the low water level electrode rod 43 and can water stop contacting.

  Next, the water supply control device 5 according to the first embodiment will be described. As shown in FIG. 1, the water supply control device 5 includes a first water level detection electrode rod 6, a second water level detection electrode rod 7, a water supply pump 8, and a control unit 9.

  The water supply control device 5 according to the first embodiment supplies water from the steam pressure and the water supply pump 8 when the first water level detection electrode rod 6 or the second water level detection electrode rod 7 detects the first water level which is a specific water level. The start time of the feed water pump 8 is determined based on the feed water temperature of the water to be supplied, the feed water pump 8 is started, and the feed water pump 8 is stopped after a predetermined start time has elapsed, so that the target water level is satisfied. Take control.

  The first water level detection electrode rod 6 is attached from the upper header 23 to the upper end portion of the first water pipe 21a. The first water pipe 21a is a water pipe arranged in the vicinity of the heating burner 24. The first water level detection electrode rod 6 includes a first external terminal 6a provided on one end side and a first electrode portion 6b provided on the other end side. The first water level detection electrode rod 6 is arranged such that the first external terminal 6a protrudes outside the first water pipe 21a and the first electrode portion 6b is accommodated inside the first water pipe 21a. The first water level detection electrode rod 6 is held at the upper end of the first water pipe 21a by a cylindrical insulator (not shown).

  The 1st electrode part 6b is comprised with the stainless steel formed in the rod shape, The surface is covered with the insulating film by an engineer plastic. As 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.

  Moreover, the 1st electrode part 6b is formed in the predetermined | prescribed length so that the specific water level of the can water introduced into the 1st water pipe 21a is detectable. That is, the 1st electrode part 6b should just have a length which can contact the can water introduced so that the specific water level may be satisfy | filled inside the 1st water pipe 21a.

  The first water level detection electrode rod 6 configured as described above has a first external terminal 6a connected to one side of a predetermined power source (not shown), and the other side of the power source is a metal first water tube. When the first electrode portion 6b becomes a capacitor in the first water pipe 21a by being connected to the current supply 21a and energized, the insulating film coated on the surface of the first electrode portion 6b is used as a dielectric, and the first electrode portion 6b The capacitance between the first water pipe 21a can be measured. And it becomes possible to detect the water level of the can water which contacts the 1st electrode part 6b inside the 1st water pipe 21a with the measured electrostatic capacitance, and it is 1st by the change of the measured electrostatic capacitance. It is possible to detect a change in the level of the can water inside the water pipe 21a.

  As shown in FIG. 1, the second water level detection electrode rod 7 is attached from the upper header 23 to the upper end portion of the second water pipe 21 b. In addition, the 2nd water pipe 21b is a water pipe which the flame injected from the heating burner 20 directly hits. The second water level detection electrode rod 7 includes a second external terminal 7a provided on one end side and a second electrode portion 7b provided on the other end side. The second water level detection electrode rod 7 is arranged such that the second external terminal 7a protrudes outside the second water pipe 21b and the second electrode portion 7b is accommodated inside the second water pipe 21b. The second water level detection electrode rod 7 is held at the upper end of the second water pipe 21b by a cylindrical insulator (not shown).

  The 2nd electrode part 7b is comprised with the stainless steel formed in the rod shape, The surface is covered with the insulating film by an engineer plastic. As 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.

  Moreover, the 2nd electrode part 7b is formed in the predetermined | prescribed length so that the specific water level of the can water introduced into the 2nd water pipe 21b inside is detectable. That is, the 2nd electrode part 7b should just have a length which can contact the can water introduced so that the specific water level may be satisfy | filled inside the 2nd water pipe 21b.

  The second water level detection electrode rod 7 configured as described above has a second external terminal 7a connected to one side of a predetermined power source (not shown), and the other side of the power source is a metal second water tube. The second electrode portion 7b becomes a capacitor inside the second water pipe 21b by energizing it by being connected to 21b, and the insulating film coated on the surface of the second electrode portion 7b is used as a dielectric, and the second electrode portion 7b It becomes possible to measure the capacitance between the second water pipe 21b. And it becomes possible to detect the water level of the can water which contacts the 2nd electrode part 7b inside the 2nd water pipe 21b by the measured electrostatic capacitance, and it is 2nd by the change of the measured electrostatic capacitance. It is possible to detect a change in the water level of the can water inside the water pipe 21b.

  The water supply pump 8 is connected to the lower header 22 through a water supply line 8a. The water supply line 8a is provided with a check valve 8b. The check valve 8b prevents water from flowing backward from the lower header 22 to the feed pump 8 side. Note that a chemical injection tank (not shown) is connected between the water supply pump 8 and the water supply tank (not shown) via a chemical injection pump (not shown), and the electric conductivity of the can water. According to this, a predetermined medicine is injected.

  The controller 9 is connected to the first water level detection electrode rod 6, the second water level detection electrode rod 7, and the water supply pump 8 via a line 9a. The controller 9 activates the water supply pump 8 based on the in-pipe water level of the first water pipe 21a detected by the first water level detection electrode rod 6 and / or the in-pipe water level of the second water pipe 21b detected by the second water level detection electrode rod 7. In addition, the start time of the feed water pump 8 is determined based on the steam pressure in the first water pipe 21a and / or the second water pipe 21b and the feed water temperature supplied to the first water pipe 21a and the second water pipe 21b. Control is performed to stop the water supply pump 8 after a lapse of time.

  Hereinafter, the water supply control process by the control unit 9A of the water supply control device 5 according to the first embodiment will be described in detail. FIG. 2 is a flowchart showing a water supply control process of the water supply control device according to the first embodiment.

  First, when the water supply control device 5 is activated by the boiler device 1 (step S10), the control unit 9 determines whether or not a first water level that is a specific water level is detected by the first water level detection electrode rod 6. (Step S15). The first water level is, for example, a possibility that the first water pipe 21a or the second water pipe 21b may be damaged due to overheating due to a drop in the water level in the first water pipe 21a or the second water pipe 21b. Including water levels that require water.

  In Step S15, when the first water level is detected by the first water level detection electrode rod 6 (no water), the control unit 9 proceeds to Step S25. On the other hand, if the first water level is not detected in the first water level detection electrode rod 6 in step S15 (there is water), the control unit 9 has detected the first water level by the second water level detection electrode rod 7. It is determined whether or not (step S20). In step S20, when the first water level is not detected (there is water), the first water pipe 21a and the second water pipe 21b both satisfy the first water level. Returning to S15, the determination of detection of the first water level by the first water level detection electrode rod 6 and the second water level detection electrode rod 7 is repeated.

  Next, when the first water level is detected by the first water level detection electrode rod 6 in step S15 (no water), or when the first water level is detected by the second water level detection electrode rod 7 in step S20 (no water) ), The control unit 9 sets the activation time (T1) of the water supply pump 8 (step S25). The activation time (T1) is set based on the steam pressure of the first water pipe 21a or the second water pipe 21b in which the first water level is detected and the temperature of water supplied by the water supply pump 8 (water supply temperature).

  For example, in the case where the vapor pressure of the first water pipe 21a or the second water pipe 21b in which the first water level is detected is less than 0.79 MPa, the control unit 9 has a case where the feed water temperature is 40 degrees or less and 41 degrees or more. In either case, the activation time (T1) is set so that the water supply pump 8 is activated for 7 seconds. That is, the control unit 9 is set to supply water to the boiler can body 20 for 7 seconds.

  For example, in the case where the steam pressure of the first water pipe 21a or the second water pipe 21b in which the first water level is detected is 0.79 to 0.89 MPa, the control unit 9 The water supply pump 8 is started for 14 seconds, and when the water supply temperature is 41 degrees or more, the start time (T1) is set so that the water supply pump 8 is started for 7 seconds. That is, when the feed water temperature is 40 degrees or less, the control unit 9 supplies water to the boiler can body 14 for 14 seconds, and when the feed water temperature is 41 degrees or more, the control section 9 is set to feed water to the boiler can body 20 for 7 seconds. .

  Further, for example, in the case where the steam pressure of the first water pipe 21a or the second water pipe 21b in which the first water level is detected is 0.89 MPa or more, the control unit 9 performs 21 seconds when the feed water temperature is 40 degrees or less. When the feed water pump 8 is started and the feed water temperature is 41 degrees or more, the start time (T1) is set so that the feed water pump 8 is started for 7 seconds. That is, the control unit 9 is set to supply water for 21 seconds when the water supply temperature is 40 degrees or less, and to supply water for 7 seconds when the water supply temperature is 41 degrees or more.

  When the activation time (T1) is set, the control unit 9 activates the water supply pump 8 (step S30). In step S30, when the water supply pump 8 is activated, the control unit 9 determines whether the activation time (T1) has elapsed (step S35). If it is determined in step S35 that the predetermined activation time (T1) has elapsed, the process proceeds to step S40, and the control unit 9 stops the water supply pump 8 (step S40). On the other hand, if it is determined in step S35 that the activation time (T1) has not elapsed, the determination is repeated until the activation time (T1) has elapsed.

  Next, when the water supply pump 8 is stopped by the control unit 9 in step S40, the control unit 9 determines whether or not there is an instruction to stop the water supply control device 5 (step S45). In step S45, when there is an instruction to stop the water supply control device 5, the control unit 9 ends the water supply control process. On the other hand, when there is no stop instruction in the water supply control device 5, the process returns to step S15 and the above control is repeated.

  The water supply control device 5 according to the first embodiment having the above-described configuration has the following effects.

  The water supply control device 5 according to the first embodiment is based on the steam pressure of the first water pipe 21a or the second water pipe 21b in which the first water level is detected and the temperature of water supplied by the water supply pump 8 (water supply temperature). The starting time of the feed water pump 8 is set. For this reason, for example, even when the boiler device 1 is repeatedly activated and stopped in a short time, even after the boiler device 1 is started immediately after the stop, the first water level is detected by the water level detection electrode rod, and then based on the steam pressure and the feed water temperature. By supplying water for a predetermined time, it becomes possible to prevent the water level from becoming higher than the target water level. Accordingly, it is possible to prevent the steam dryness from being lowered by starting the boiler apparatus at a high water level and causing the steam to flow with the can water accompanying the steam. In addition, even during operation of the boiler apparatus 1, it is possible to set an appropriate target water level by supplying water for a predetermined time based on the steam pressure and the supply water temperature.

  Further, the water supply control device 5 according to the present embodiment detects the in-pipe water level inside the water pipe by using two electrode rods of the first water level detection electrode rod 6 and the second water level detection electrode rod 7. The first water level detection electrode rod 6 and the second water level detection electrode rod 7 are attached to a water pipe disposed in a place where overheating is likely to occur. Therefore, for example, even when the superheated water pipes differ depending on the location of the water pipes, the first water level detection electrode rod 6 and the second water level detection electrode rod 7 are attached to the water pipes that are likely to overheat. Since water is supplied based on easy water pipes, it is possible to prevent water pipes from being damaged due to overheating.

[2] Second Embodiment FIG. 3 is a schematic diagram showing a schematic configuration of a boiler apparatus having a water supply control device according to a second embodiment of the present invention. As shown in FIG. 3, the boiler apparatus 1A having the water supply control apparatus 5A according to the second embodiment has the same configuration as the boiler apparatus 1 according to the first embodiment. The water supply control device 5A according to the second embodiment is different from the first embodiment in the control method in the control unit 9A of the water supply control device 5A.

  Hereinafter, it demonstrates centering on the water supply control process in 9 A of control parts of the water supply control apparatus 5A which is a different part from 1st Embodiment. In the following embodiments, parts that are not particularly described are the same as those in the first embodiment, and the same reference numerals are given to the numbers given in the drawings if they are the same as those in the first embodiment.

  As shown in FIG. 3, the boiler device 1 </ b> A mainly includes a boiler body 2, an air / water separator 3, a water level detection device 4, and a water supply control device 5 </ b> A.

  The boiler body 2 includes a boiler can 20, a plurality of water pipes 21, a lower header 22, an upper header 23, and a heating burner 24.

  Further, the water supply control device 5A includes a first water level detection electrode rod 6, a second water level detection electrode rod 7, a water supply pump 8, and a control unit 9A.

  The control unit 9A is connected to the first water level detection electrode rod 6, the second water level detection electrode rod 7, and the water supply pump 8 through a line 9a. The control unit 9A activates the water supply pump 8 when the second water level, which is a specific water level by the first water level detection electrode rod 6 or the second water level detection electrode rod 7, is not detected due to a decrease in can water. When the water level rises due to the activation of the water supply pump and the second water level is detected by the first water level detection electrode rod 6 and the second water level detection electrode rod 7, the steam in the first water pipe 21a and the second water pipe 21b is detected. Based on the pressure and the temperature of the water supplied from the water supply pump 8 (water supply temperature), the start time of the feed water pump 8 after detection of the second water level (hereinafter referred to as “remaining start time”) is determined, and a predetermined start remaining Water supply control is performed so as to satisfy the target water level by stopping the water supply pump 8 after a lapse of time.

  Hereinafter, the water supply control process by the control unit 9A of the water supply control device 5A according to the second embodiment will be described in detail. FIG. 4 is a flowchart showing a water supply control process of the water supply control device according to the second embodiment.

  First, when the water supply control device 5A is activated by the boiler device 1A (step S50), the control unit 9A determines whether or not the second water level is detected by the first water level detection electrode rod 6 (step S55). In addition, a 2nd water level contains the target water level in the case of supplying water to the boiler main body 2, for example.

  In step S55, if the second water level is not detected by the first water level detection electrode rod 6 (no water), the process proceeds to step S65. On the other hand, in step S55, when the second water level is detected by the first water level detection electrode rod 6 (with water), the control unit 9 determines whether the second water level is detected by the second water level detection electrode rod 7 or not. Is determined (step S60).

  In step S60, if the second water level is not detected by the second water level detection electrode rod 7 (no water), the process proceeds to step S65. On the other hand, in step S60, when the second water level is detected by the second water level detection electrode rod 7 (with water), both the first water pipe 21a and the second water pipe 21b satisfy the second water level. Therefore, the control unit 9 returns to step S55 and repeats the determination of the detection of the second water level by the first water level detection electrode rod 6 and the second water level detection electrode rod 7.

  Next, when the second water level is not detected by the first water level detection electrode rod 6 in step S55, or when the second water level is detected by the second water level detection electrode rod 7 in step S60, the control unit 9A. Activates the water supply pump 8 (step S65).

  When the in-pipe water level rises due to the activation of the water supply pump 8, the control unit 9A determines whether or not the second water level is detected by the first water level detection electrode rod 6 (step S70). In step S70, when the second water level is not detected by the first water level detection electrode rod 6 (no water), the control unit 9A determines until the second water level is detected by the first water level detection electrode rod 6. repeat. On the other hand, when the second water level is detected by the first water level detection electrode rod 6 (with water), the process proceeds to step S75.

  Next, the control unit 9 </ b> A determines whether the second water level is detected by the second water level detection electrode rod 7. In step S75, if the second water level is not detected by the second water level detection electrode rod 7 (no water), the control unit 9A determines until the second water level is detected by the second water level detection electrode rod 7. repeat. On the other hand, when the second water level is detected by the second water level detection electrode rod 7 (with water), the process proceeds to step S80.

  Next, when the second water level is detected by the second water level detection electrode rod 7 in step S75 (with water), the first water pipe 21a and the second water pipe 21b may both satisfy the second water level. However, since there is a possibility of erroneous recognition due to bubbles or the like, the control unit 9A sets the remaining activation time (T2) of the water supply pump 8. The setting of the remaining activation time (T2) is set based on the steam pressure of the first water pipe 21a or the second water pipe 21b in which the second water level is detected and the temperature of water supplied by the water supply pump 8 (water supply temperature). .

  For example, in the case where the vapor pressure of the first water pipe 21a or the second water pipe 21b in which the second water level is detected is less than 0.79 MPa, the control unit 9A has a case where the feed water temperature is 40 degrees or less and 40 degrees or more. In any case, the remaining activation time (T2) is set so that the water supply pump 8 is activated for 7 seconds. That is, the control unit 9A sets the boiler can body 20 to supply water for 7 seconds.

  For example, when the steam pressure of the first water pipe 21a or the second water pipe 21b in which the second water level is detected is 0.79 to 0.89 MPa, the control unit 9A The water supply pump 8 is started for 14 seconds, and when the water supply temperature is 41 degrees or more, the remaining activation time (T2) is set so that the water supply pump 8 is started for 7 seconds. That is, the control unit 9A sets the boiler can body 20 to supply water for 14 seconds when the feed water temperature is 40 degrees or less, and to supply water to the boiler can body 20 for 7 seconds when the feed water temperature is 41 degrees or more. .

  Furthermore, for example, in the case where the steam pressure of the first water pipe 21a or the second water pipe 21b in which the second water level is detected is 0.89 MPa or more, the control unit 9A is 21 seconds when the feed water temperature is 40 degrees or less. When the feed water pump 8 is started and the feed water temperature is 41 degrees or more, the remaining start time (T2) is set so that the feed pump 8 is started for 7 seconds. That is, the control unit 9A sets to supply water for 21 seconds when the water supply temperature is 40 degrees or less, and to supply water for 7 seconds when the water supply temperature is 41 degrees or more.

  When the remaining activation time (T2) is set in step S80, the control unit 9A determines whether the remaining activation time (T2) has elapsed since the second water level was detected (step S85). If it is determined in step S85 that the remaining activation time (T2) has elapsed, the process proceeds to step S90, and the water supply pump 8 is stopped (step S90). On the other hand, if it is determined in step S85 that the remaining activation time (T2) has not elapsed, the determination is repeated until the remaining activation time (T2) has elapsed.

  Next, when the water supply pump 8 is stopped by the control unit 9A in step S90, the control unit 9A determines whether or not there is an instruction to stop the water supply control device 5A (step S95). In step S95, when there is an instruction to stop the water supply control device 5A, the control unit 9A ends the water supply control process. On the other hand, if there is no instruction to stop the water supply control device 5A, the process returns to step S55 and the above control is repeated.

  According to the water supply control device 5A according to the second embodiment having the above-described configuration, the following effects can be obtained.

  The water supply control device 5A according to the second embodiment is based on the steam pressure of the first water pipe 21a or the second water pipe 21b in which the second water level is detected and the temperature of water supplied by the water supply pump 8 (water supply temperature). The starting time of the feed water pump 8 is set. For this reason, for example, even when the boiler device 1A is repeatedly activated and stopped in a short time, even when the boiler device 1A is started immediately after the stop, the second water level is detected by the water level detection electrode rod, and then based on the steam pressure and the feed water temperature. By supplying water for a predetermined time, it becomes possible to prevent the water level from becoming higher than the target water level. Accordingly, it is possible to prevent the steam dryness from being lowered by starting the boiler apparatus 1A at a high water level and causing the steam to flow along with the can water. Further, even during operation of the boiler apparatus 1A, it is possible to set an appropriate target water level by supplying water for a predetermined time based on the steam pressure and the supply water temperature.

  In addition, the water supply control device 5A according to the second embodiment detects the in-pipe water level inside the water pipe by using two electrode rods of the first water level detection electrode rod 6 and the second water level detection electrode rod 7. The first water level detection electrode rod 6 and the second water level detection electrode rod 7 are attached to a water pipe disposed in a place where overheating is likely to occur. Therefore, for example, even when the superheated water pipes differ depending on the location of the water pipes, the first water level detection electrode rod 6 and the second water level detection electrode rod 7 are attached to the water pipes that are likely to overheat. Since water is supplied based on easy water pipes, it is possible to prevent water pipes from being damaged due to overheating.

  In addition, embodiment of this invention is not limited to the said embodiment at all, and the technical scope of this invention is not limited to this. For example, in the present embodiment, a plurality of water pipes 21 are erected at predetermined intervals in the circumferential direction of the boiler can body 20, a combustion chamber 25 is provided at a substantially central portion, and a heating burner 24 is disposed above the combustion chamber 25. However, the present invention is not limited to this. For example, it is good also as a structure which arrange | positions the heating burner 24 to the surrounding surface of the boiler can body 20, and heats each water pipe 21 from the side of the some water pipe 21 standingly arranged.

  Further, in the present embodiment, the first water pipe 21a to which the first water level detection electrode rod 6 is attached is disposed in the vicinity of the heating burner 24, and the second water pipe 21b to which the second water level detection electrode rod is attached is a heating burner. Although it arrange | positioned in the place where the flame injected from 20 hits directly, in this invention, it is not restricted to this. The first water pipe 21a to which the first water level detection electrode rod is attached and the second water pipe 21b to which the second water level detection electrode rod is attached are arranged at places where there is a possibility of overheating each other. That's fine. Examples of places where there is a possibility of overheating include the vicinity of the heating burner 24 and the vicinity of a flue (not shown).

  In this embodiment, the two water level detection electrode rods, ie, the first water level detection electrode rod 6 and the second water level detection electrode rod 7 have been described. However, the present invention is not limited to this. For example, a water supply control device may be configured using one water detection electrode rod, or a water supply control device may be configured using a plurality of water level detection electrode rods.

It is the schematic which shows schematic structure of the boiler apparatus which has a water supply control apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows the water supply control process of the water supply control apparatus which concerns on 1st Embodiment of this invention. It is the schematic which shows schematic structure of the boiler apparatus which has a water supply control apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the water supply control process of the water supply control apparatus which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Boiler apparatus 2 Boiler main body 3 Air-water separator 4 Water level detection apparatus 5, 5A Water supply control apparatus 6 1st water level detection apparatus (water level detection electrode rod)
7 Second water level detection device (water level detection electrode rod)
8 Water supply pump 9 Control unit 21a First water pipe 21b Second water pipe

Claims (2)

A heating burner that injects a flame;
Is attached to the water tubes accommodated in the boiler body, the interior of the first water level detecting electrode bars capable of detecting a specific water level and a second level detecting electrode bars of the water pipe,
A water supply pump for supplying water to the boiler can body;
A control unit for controlling the start and stop of the water supply pump,
The first water level detection electrode rod is a first water pipe arranged in the vicinity of the heating burner among the water pipes, and is attached to a first water pipe arranged in a place where it is easy to overheat,
The second water level detection electrode rod is attached to a second water pipe directly hit by a flame sprayed from the heating burner,
The controller is
When the first water level detection electrode rod or the second water level detection electrode rod detects the specific water level, the water supply pump is activated, and based on the pressure of the water pipe and the water supply temperature supplied to the water pipe A water supply control device, characterized by determining a start time of a water supply pump and stopping the water supply pump after the start time has elapsed. A heating burner that injects a flame;
Is attached to the water tubes accommodated in the boiler body, the interior of the first water level detecting electrode bars capable of detecting a specific water level and a second level detecting electrode bars of the water pipe,
A water supply pump for supplying water to the boiler can body;
A control unit for controlling the start and stop of the water supply pump,
The first water level detection electrode rod is a first water pipe arranged in the vicinity of the heating burner among the water pipes, and is attached to a first water pipe arranged in a place where it is easy to overheat,
The second water level detection electrode rod is attached to a second water pipe directly hit by a flame sprayed from the heating burner,
The controller is
When the first water level detection electrode rod or the second water level detection electrode rod does not detect the specific water level, the water supply pump is activated,
When the first water level detection electrode rod or the second water level detection electrode rod detects the specific water level by starting the water supply pump, based on the pressure of the water pipe and the water supply temperature supplied to the water pipe, A water supply control device that determines a start time of the water supply pump and stops the water supply pump after the start time has elapsed.

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