JP2012132651A - Boiler device and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boiler device for preventing the concentration of canned water while stably maintaining a water level in a can body within the range of a predetermined water level, and for achieving energy saving by suppressing the deterioration of thermal efficiency accompanied by drainage and a method of controlling the same.SOLUTION: A control part includes: a concentration management drainage mode 30; and a water level management drainage mode 31 which is given priority over the concentration management drainage mode 30. The water level management drainage mode 31 is configured to, when a water level detected by a water level detection part is equal to or more than a first set water level, make a drainage part drain water whose water volume is predetermined, and the concentration management drainage mode 30 is configured to make the drainage part drain water whose water volume is made to correspond to the burning position of a burning part.

Description

  The present invention relates to a boiler device including a drainage unit capable of adjusting the amount of drainage from a can body and a control method thereof.

As a conventional boiler device, a can body in which water is stored, a combustion section that has a plurality of stepwise combustion positions, heats the can body, a water supply section that supplies water to the can body, 2. Description of the Related Art There is known a water level detection unit that detects a water level in a can body, a drainage unit that discharges water from the can body, and a control unit.
In this type of boiler apparatus, the water in the can (canned water) is concentrated, which may cause corrosion inside the can, including the water pipe, a decrease in dryness due to carry-over, and scale adhesion. For the purpose of preventing the concentration of such can water, a water softener is provided in the water supply line to the can body to perform water treatment such as reducing the hardness of the water. However, when the boiler apparatus has been operated for a certain period of time, the can water is concentrated (concentrated), resulting in problems of scale adhesion, corrosion, and carry-over.

  Therefore, for the purpose of eliminating the concentrated state of the can water, every time the cumulative combustion time of the combustion section reaches a set value, a concentration blow for draining the can water from the drain section is performed (for example, Patent Document 1 below). reference). While being drained from the can body by the concentration blow, water is supplied from the water supply section into the can body, so that the can water is diluted.

  In general, within a predetermined water level within the can body, the amount of water supplied per unit time supplied from the water supply section to the can body is set according to the combustion position of the combustion section. This is related to the fact that the evaporation amount (steam generation amount) of can water is roughly determined by the combustion position. On the other hand, when performing the concentration blow, the drainage part is always fully open.

JP 2002-106806 A

However, the conventional boiler apparatus has the following problems.
In recent years, the combustion position of the combustion section is of a high TDR (turn-down ratio) multi-position combustion type (for example, high combustion, medium combustion, low combustion, combustion stop) that can realize further energy saving than the conventional one. Became known.

  When the combustion section is set to a high TDR, such as the multi-position combustion type, the drainage amount of the concentrated blow is equivalent to the water supply amount (100% blow) at the combustion position where the amount of evaporation is low (low combustion, etc.) In some cases, excessive replacement of can water causes discharge of high temperature can water and lowers thermal efficiency, or the water level in the can body becomes too low.

  The present invention has been made in view of such circumstances, and can stably prevent the concentration of can water while stably maintaining the water level in the can within the range of the predetermined water level. It aims at providing the boiler apparatus which can suppress a fall, and can save energy, and its control method.

In order to achieve the above object, the present invention proposes the following means.
That is, the present invention provides a can body, a combustion section that has a plurality of stepwise combustion positions, heats the can body, a water level detection section that detects a water level in the can body, and a drainage amount from the can body. A boiler device including an adjustable drainage unit and a control unit, wherein the control unit includes a concentration management drainage mode and a water level management drainage mode that is prioritized over the concentration management drainage mode. The water level management drainage mode is configured to drain a predetermined amount of water from the drainage unit when the water level detected by the water level detection unit is equal to or higher than a first set water level, and the concentration management drainage mode includes the combustion unit It is comprised so that the amount of water corresponding to the combustion position may be drained from the drainage part.
Further, the present invention provides a can body, a combustion section that has a plurality of stepwise combustion positions, heats the can body, a water level detection section that detects a water level in the can body, and a drainage amount from the can body. A control method for a boiler device comprising an adjustable drainage unit, comprising: a concentration management drainage mode; and a water level management drainage mode that is prioritized over the concentration management drainage mode, the water level management drainage In the mode, when the water level detected by the water level detection unit is equal to or higher than the first set water level, a predetermined amount of water is drained from the drainage unit, and in the concentrated management drainage mode, it corresponds to the combustion position of the combustion unit. A quantity of water is drained from the drainage section.

  According to the boiler device and the control method thereof of the present invention, since it is provided with the concentrated management drainage mode and the water level management drainage mode that has priority over the concentrated management drainage mode, the amount of drainage from the drainage section is matched to the situation. It can be adjusted as appropriate, and has the following effects.

  That is, when the water level in the can body is equal to or higher than the first set water level (for example, the upper limit set water level), the water level management drainage mode drains a predetermined amount (for example, the maximum drainage amount) of water from the drainage section. The water level of the boiler device can be quickly shifted within the range of the desired predetermined water level, and the performance of the boiler device is stably exhibited.

  In addition, when the water level in the can is within a predetermined water level range (for example, between the upper limit set water level and the lower limit set water level), the concentration management drainage mode drains water of the amount corresponding to the combustion position of the combustion section. For example, even if the combustion section is set to a high TDR, even if the combustion section is set to a high TDR, the amount of drainage is appropriately adjusted according to each combustion position. It is prevented that high can water is discharged and the thermal efficiency is lowered or the water level in the can body becomes too low.

In this way, the amount of drainage from the drainage unit is adjusted as appropriate according to the water level in the can, the combustion position of the combustion unit, etc., so the purpose of drainage is achieved while reliably suppressing the impact of drainage on water supply. Appropriate blow control can be performed.
Therefore, according to the present invention, it is possible to reliably prevent scale adhesion, corrosion and carry-over due to concentration of can water while stably maintaining the water level in the can within the range of the predetermined water level, and accompanying drainage. Energy saving can be realized by suppressing a decrease in thermal efficiency.

  According to the boiler device and the control method thereof of the present invention, the water level in the can body can be stably maintained within a predetermined water level range, while the can water can be prevented from being concentrated, and the decrease in thermal efficiency associated with drainage can be suppressed. Energy saving is possible.

It is a schematic explanatory drawing of the boiler apparatus which concerns on one Embodiment of this invention. It is a flowchart explaining the control method of the boiler apparatus which concerns on one Embodiment of this invention.

Hereinafter, the boiler apparatus 10 which concerns on one Embodiment of this invention is demonstrated with reference to FIG.
As shown in FIG. 1, the boiler device 10 of the present embodiment includes a can body 1 in which water is stored, a combustion section 2 that has a plurality of stepwise combustion positions and heats the can body 1, and a can A water supply unit 3 for supplying water to the body 1, a water level detection unit 4 for detecting the water level in the can 1, and a drainage unit for discharging water (can water) from the can 1 and adjusting the amount of drainage 5, and a control unit 6 that is electrically connected to and controls the combustion unit 2, the water supply unit 3, the water level detection unit 4, and the drainage unit 5.

  The can 1 heats the upper header 7, the lower header 8, a plurality of water pipes 9 that connect the headers 7, 8, and the combustion gas (flame and exhaust gas) from the water pipe 9 and the combustion unit 2. And a combustion chamber 11 to be exchanged. The upper header 7, the lower header 8, and the water pipe 9 are formed in a liquid-tight manner while communicating with each other. Further, the upper header 7, the lower header 8 and the water pipe 9 are separated from the combustion chamber 11.

  The lower header 8 is disposed at the lower part of the can 1 and is connected to the lower ends of a plurality of water pipes 9. A water supply unit 3 is connected to the lower header 8 via a water supply line 12, and water is supplied into the can 1 through the water supply unit 3.

  The upper header 7 is disposed at the upper portion of the can 1 and is connected to the upper ends of a plurality of water pipes 9. A steam / water separator 14 is connected to the upper header 7 via a steam / water line 13. Steam generated in the water pipe 9 is stored in the upper header 7 so that the steam is sent out of the can body 1 through the steam / water line 13 and flows toward the steam / water separator 14. It is configured.

  The water supply unit 3 includes a pump 15 that sends water to the can 1 and an inverter 16 that is electrically connected to the pump 15 and can adjust the amount of water supplied from the pump 15 by changing the frequency. Yes. Specifically, the water supply line 12 connects the pump 15 of the water supply unit 3 and the lower header 8, and between the pump 15 and the lower header 8 in the water supply line 12, the water supply unit 3 connects the inside of the can 1. A flow meter 17 for measuring the amount of water supplied to the water is disposed. The flow meter 17 is electrically connected to the control unit 6.

  Although not particularly illustrated, a water softener and a water quality measurement unit disposed between the water softener and the pump 15 are provided on the upstream side of the pump 15 in the water supply line 12. The water quality measurement unit measures the quality of treated water that has been softened by a water softener, and in particular, measures the hardness, silica concentration, etc. that affect the generation of scale, and determines the presence or absence of water quality abnormalities. Used. A check valve may be provided on the downstream side of the pump 15 and the flow meter 17 in the water supply line 12.

  The steam / water separator 14 separates moisture from the steam supplied through the steam / water line 13. In addition to the steam / water line 13, the steam / water separator 14 includes a steam delivery line 18 for sending dry steam, and a precipitation line 19 for returning the water separated and collected by the steam / water separator 14 to the lower header 8. And are connected.

  The steam delivery line 18 connects the steam / water separator 14 to an external device (steam-using device) or the like, and the steam delivery line 18 is provided with a flow rate adjusting valve (not shown). The amount of dry steam delivered from the water separation unit 14 is adjusted.

  A drainage line 20 is connected to a precipitation line 19 that connects the steam separator 14 and the lower header 8, and the drainage unit 5 is connected to the lower header 8 via the drainage line 20 and the precipitation line 19. ing.

  The drainage unit 5 includes a plurality of drainage valves 21, and in this embodiment, two drainage valves 21 </ b> A and 21 </ b> B are arranged in parallel to the drainage line 20. Further, the drainage amount per unit time of one drainage valve 21A is set larger than the drainage amount of the other drainage valve 21B. Specifically, when the water supply amount per unit time from the water supply unit 3 corresponding to the highest combustion position with the largest combustion amount among the plurality of combustion positions in the combustion unit 2 is 100%, the water supply amount is On the other hand, the amount of drainage from one drain valve 21A is set to 12%, and the amount of drainage from the other drain valve 21B is set to 8%. That is, in a state where both the drain valves 21A and 21B are open, the blow rate is 20% with respect to the water supply amount (100%). These drain valves 21 </ b> A and 21 </ b> B are configured to be controlled by the control unit 6.

  The water level detection unit 4 detects the first set water level WL1 in the water pipe 9 of the can 1 and the second set water level WL2 that detects the second set water level WL2 lower than the first set water level WL1 in the water pipe 9. And a water level sensor 23. In the present embodiment, the first set water level WL1 is the upper limit set water level of the can water, and the second set water level WL2 is the lower limit set water level of the can water.

  The first water level sensor 22 and the second water level sensor 23 are inserted downward from the upper surface of the detector body 24 in which can water is stored. The first water level sensor 22 and the second water level sensor 23 have different lengths and different bottom end positions. The first water level sensor 22 and the second water level sensor 23 are each electrically connected to the control unit 6.

  The detector body 24 is connected to the upper header 7 via the upper connecting pipe 25 and is connected to the lower header 8 via the lower connecting pipe 26. Thereby, the detector main body 24 and the water pipe 9 are connected, and the water level in the detector main body 24 is made to correspond to the water level in the water pipe 9.

  Here, in the following description, a state in which the water level of the can 1 detected by the water level detection unit 4 is less than the first set water level WL1 and is equal to or higher than the second set water level WL2 is within a predetermined water level range. Say that. In addition, a state in which the water level of the can 1 detected by the water level detection unit 4 is equal to or higher than the first set water level WL1 or less than the second set water level WL2 is referred to as being outside the predetermined water level range.

The combustion unit 2 is disposed above the combustion chamber 11 and is connected to the burner 27 via a fuel supply line 28 and a burner 27 that ejects combustion gas into the combustion chamber 11 below, and opens the valve. And a fuel supply valve 29 capable of adjusting the amount of combustion of the burner 12 (the amount of combustion per unit time) by changing the degree.
And the amount of steam generation per unit time of the boiler device 10 is controlled by controlling the combustion amount of the burner 27.

  In the present embodiment, the combustion unit 2 is a four-position combustion type among the high TDR multi-position combustion types. Specifically, the combustion unit 2 has three combustion positions (high combustion, medium combustion, low combustion) having different combustion amounts and one combustion stop position. The amount of combustion in the combustion section 2 at the three combustion positions is set to 50% for medium combustion and 20% for low combustion, assuming that high combustion is 100%. That is, the TDR of the combustion unit 2 of the present embodiment is 1: 5. Further, the combustion amount at the combustion stop position is 0%.

  The high TDR is, for example, the combustion amount at the lowest (low combustion) combustion position among the plurality of combustion positions having different combustion amounts with respect to the combustion amount at the highest (high combustion) combustion position. , It is set to 20% or less. And if such conditions are satisfy | filled, the number of combustion positions will not be limited, that is, the said high TDR is not limited to the 4 position combustion type of this embodiment.

  The control unit 6 includes a concentrated management drainage mode 30 and a water level management drainage mode 31 that has priority over the concentrated management drainage mode 30.

The water level management drainage mode 31 is detected by the full water blow mode for draining a predetermined amount of water from the drainage unit 5 and the water level detection unit 4 when the water level detected by the water level detection unit 4 is equal to or higher than the first set water level WL1. When the water level is lower than the second set water level WL2, the water level tracking assist mode is configured to close the drainage part.
The water level management drainage mode 31 is configured to operate when the water level of the can 1 is outside the range of the predetermined water level.

  Specifically, when the water level detected by the water level detection unit 4 is equal to or higher than the first set water level WL1 in the water level management drain mode 31, the control unit 6 opens all the drain valves 21 set in advance. (Full blow mode). Here, the set drain valve 21 is a drain valve 21A and a drain valve 21B in the present embodiment. The predetermined amount is the maximum drainage amount in the present embodiment. That is, in the full water blow mode, the drainage unit 5 is fully opened (20% blow).

  Further, in the case of the water level management drainage mode 31, when the water level detected by the water level detection unit 4 is less than the second set water level WL2, the control unit 6 closes all the drain valves 21A and 21B set in advance. (Water level tracking assist mode).

The concentration management drainage mode 30 is configured to include a concentration restriction mode, a concentration upper limit value / concentration lower limit value mode, a post-blowing inhibition mode, and a concentration blow mode.
The concentration management drainage mode 30 is configured to operate when the water level of the can 1 is within the predetermined water level.

The priority order of each mode in the water level management drainage mode 31 and the concentration management drainage mode 30 is expressed as follows using an inequality sign.
Full water blow mode> Water level tracking assist mode> Concentration restriction mode> Concentration upper limit value / concentration lower limit value mode> After-blow suppression mode> Concentration blow mode.

  The concentration management drainage mode 30 is configured to drain the water amount corresponding to the combustion position of the combustion unit 2 from the drainage unit 5. That is, in the case of the concentration management drain mode 30, the control unit 6 is configured to open the drain valves 21 corresponding to the respective combustion positions among the set drain valves 21.

  Specifically, in the concentration management drainage mode 30, when the combustion unit 2 is burning at a combustion position lower than a preset combustion position, the amount of water less than the drainage amount corresponding to the set combustion position from the drainage unit 5 It is configured to drain the water.

  In the present embodiment, the set combustion position is “medium combustion” among the three combustion positions. And in the case of the concentration management drainage mode 30, the control part 6 is blown from the drainage part 5 in which the blow rate is set high when the combustion part 2 is burning at the combustion position of high combustion or medium combustion. For example, full blow). When the combustion unit 2 is burning at a low combustion position lower than the middle combustion, blow (restricted blow) is performed from the drainage unit 5 with a low blow rate.

Further, the concentration management drainage mode 30 performs the concentration management based on the drainage by the water level management drainage mode 31 and the drainage by the current concentration management drainage mode 30 performed after the previous concentration management drainage mode 30 ends. It is configured.
The drainage is
1. 1. Cumulative value of drainage time 2. Cumulative amount of wastewater 3. Calculated based on the drain valve 21 opening and drainage time. What added the combustion position of the combustion part 2 to the said 1-3 is further included.

In the boiler apparatus 10 having such a configuration, water is supplied from the pump 15 through the lower header 8 into the water pipe 9 so that the water level in the water pipe 9 detected by the water level detection unit 4 falls within the range of the predetermined water level. Supplied. When the burner 27 burns and the combustion gas is ejected into the combustion chamber 11, the can water in the water pipe 9 is heated to become steam, and this steam is stored in the upper header 7.
The steam in the upper header 7 is sent to the steam / water separator 14 through the steam / water line 13, and the steam / water separator 14 separates and collects moisture in the steam to obtain dry steam.

The dry steam thus obtained is sent to an external device or the like through the steam delivery line 18.
Further, the water separated and collected by the air / water separator 14 is sent to the lower header 8 through the precipitation line 19 and is supplied again into the water pipe 9. In addition, since the water | moisture content isolate | separated and collect | recovered by the steam separation part 14 has comparatively high temperature, the temperature of the can water in the lower header 8 will rise.

  Next, the control method of the boiler apparatus 10 is demonstrated with reference to the flowchart shown in FIG. The control method of the boiler device 10 in the present embodiment relates to blow control for controlling the amount of drainage from the drainage unit 5.

First, it is confirmed whether or not the boiler device 10 is in operation (S01).
If it is in operation, the process proceeds to S02 of the water level management drainage mode 31.
If it is not in operation, it is terminated.

Next, it is confirmed whether or not the water level in the can 1 is equal to or higher than the first set water level (upper limit set water level) WL1 (S02).
When the water level is equal to or higher than the first set water level WL1, the full water blow mode is set, the drain valve 21A and the drain valve 21B of the drainage section 5 are opened, fully opened (predetermined amount of drainage) (S03), and the process returns to S01. .
When the water level is lower than the first set water level WL1, the process proceeds to S04.

Next, it is confirmed whether or not the water level in the can 1 is less than the second set water level (lower limit set water level) WL2 (S04).
When the water level is less than the second set water level WL2, the water level follow-up assist mode is set, the drain valve 21A and the drain valve 21B of the drainage section 5 are closed, blow off (drainage is stopped) (S05), and the process returns to S01. .
When the said water level is more than 2nd setting water level WL2, it progresses to S06 of the concentration management drainage mode 30. FIG.

Next, it is confirmed whether or not the concentration management drainage mode 30 satisfies the concentration blow condition (S06). The concentration blow conditions include, for example, a comparison between a concentration value based on the detection result of the electric conductivity of water in the can 1 and a predetermined concentration upper limit value, a combustion accumulation time of the combustion unit 2, a combination thereof, and the like. Depending on the purpose of drainage of each mode of the concentration management drainage mode 30, different conditions are appropriately used. In addition, when the combustion accumulation time is used as the concentration blow condition, the combustion time is accumulated only when the steam pressure in the upper header 7 is equal to or higher than a predetermined value so that the combustion time of only the pilot fire (pilot burner) is not accumulated. It is preferable that it is set as the structure which carries out.
If the concentration blow condition is satisfied, the process proceeds to S07.
If the concentration blow condition is not satisfied, the process returns to S01.

Here, when proceeding to S07, the concentration management drainage mode 30 is set to one of the following modes according to the concentration blow condition of S06.
That is, when the combustion accumulation time of the combustion unit 2 is a predetermined value or more and the concentration value in the can 1 is within a predetermined concentration range (between the concentration upper limit value and the concentration lower limit value), It becomes the concentration blow mode.
Further, when the concentration value in the can body 1 is not increased (when scale adhesion in the can body 1 is effectively suppressed), the concentration restriction mode is set. The concentration limiting mode means that the progress of concentration in the can 1 (the increase in the concentration value) is limited.
Moreover, when the said concentration value in the can 1 is more than a predetermined concentration upper limit value, it becomes a concentration upper limit value mode, and when the said concentration value is below a predetermined concentration lower limit value, it is concentration lower limit value mode. Become.
In addition, when the interval from the previous blow to the current blow is short (for example, when the detected concentration value is greater than or equal to a predetermined concentration upper limit value, but the accumulated combustion time is significantly less than the predetermined value, etc.), It becomes the suppression mode.
And in the concentration management drainage mode 30, the blow rate setting according to each said mode is made. The priority order of these modes is as described above. Note that the opening / closing patterns (opening / closing states) of the drain valves 21A and 21B of the drainage unit 5 to be described later are merely examples used for simply explaining the present embodiment, and actually set variously according to the respective modes. However, the present invention is not limited to those described below.

Next, it is confirmed whether or not the combustion position of the combustion unit 2 is lower (low combustion) than the set combustion position (medium combustion) (S07).
When the combustion position of the combustion section 2 is lower than the set combustion position, only the drain valve 21B of the drain section 5 is opened, restriction blow is performed (S08), and the process proceeds to S10.
When the combustion position of the combustion section 2 is equal to or higher than the set combustion position (high combustion, medium combustion), the drain valve 21A of the drain section 5 is drained so that a larger amount of water than the limit blow is discharged. Then, the drain valve 21B is opened, fully opened (predetermined amount of drainage) is performed (S09), and the process proceeds to S11. In S09, instead of opening the drain valve 21A and the drain valve 21B as described above, only the drain valve 21A is opened, and the amount of drainage is higher than the limited blow with the low blow rate setting by only the drain valve 21B in S08. It may be limited blow for setting the blow rate.

If the restriction blow of S08 is performed, it is next checked whether or not the restriction blow completion condition is satisfied (S10).
If the restriction blow completion condition is satisfied, the process proceeds to S12.
If the restriction blow completion condition is not satisfied, the process returns to S08.

If the fully-open blow of S09 has been performed, it is next checked whether or not the fully-open blow completion condition is satisfied (S11).
If the fully open blow completion condition is satisfied, the process proceeds to S12.
If the fully open blow completion condition is not satisfied, the process returns to S09.

  The restriction blow completion condition and the fully open blow completion condition include, for example, a comparison between a concentration value based on a detection result of the electrical conductivity of water in the can 1 and a predetermined concentration lower limit value, and drainage of the drainage section 5. A configuration based on drainage such as cumulative time (see the description of “concentration management” above), a combination thereof, and the like, wherein different conditions are appropriately used depending on the drainage purpose of each mode of the concentration management drainage mode 30 Has been.

  If either the limited blow completion condition of S10 or the fully open blow completion condition of S11 is satisfied, then the drain valve 21 of the drainage unit 5 is closed, blow off (drainage stop) (S12), and the process returns to S01. .

  As described above, according to the boiler device 10 and the control method thereof according to the present embodiment, the concentrated management drainage mode 30 and the water level management drainage mode 31 that has priority over the concentrated management drainage mode 30 are provided. Therefore, the amount of drainage from the drainage part 5 can be adjusted as appropriate according to the situation, and specifically the following effects are achieved.

  That is, when the water level in the can body 1 is equal to or higher than the first set water level (upper limit set water level) WL1, the water level management drainage mode 31 drains a predetermined amount (maximum drainage amount) of water from the drainage part 5. The water level in the can 1 can be quickly shifted to the desired range of the predetermined water level, and the performance of the boiler device 10 is stably exhibited.

  Further, when the water level in the can 1 is within the range of the predetermined water level, the concentrated management drainage mode 30 drains the water of the amount corresponding to the combustion position of the combustion unit 2 from the drainage unit 5. As described in the embodiment, even when the combustion unit 2 is set to a high TDR and is burning low, the amount of drainage is appropriately adjusted according to each combustion position, and becomes equivalent to the water supply amount. There is nothing. As a result, it is possible to prevent the canned water having a high temperature from being discharged due to the replacement of the canned water more than necessary and lowering the thermal efficiency or the water level in the can 1 being too low.

As described above, the amount of drainage from the drainage unit 5 is appropriately adjusted according to the water level in the can body 1, the combustion position of the combustion unit 2, and the like. Appropriate blow control can be performed to achieve the objective.
Therefore, according to the boiler device 10 of the present embodiment, the scale level, corrosion, and carry-over due to the concentration of the can water can be ensured while the water level in the can body 1 is stably maintained within the range of the predetermined water level. It can be prevented, and energy saving can be realized by suppressing a decrease in thermal efficiency caused by drainage.

  Moreover, since the drainage unit 5 includes a plurality of drainage valves 21A and 21B, the drainage amount from the can 1 can be easily and accurately adjusted by selectively opening and closing the drainage valves 21A and 21B. .

Further, in the case of the water level management drainage mode 31, when the water level detected by the water level detection unit 4 is equal to or higher than the first set water level WL1, the control unit 6 opens all the drain valves 21A and 21B set in advance. Therefore, the water level can be surely lowered quickly to the range of the predetermined water level.
Further, in the case of the water level management drainage mode 31, when the water level detected by the water level detection unit 4 is less than the second set water level WL2, the control unit 6 closes all the drain valves 21A and 21B set in advance. Therefore, the water level can be reliably and quickly raised to within the predetermined water level by the water supply from the water supply unit 3.

  Further, when the water level in the can 1 is within the range of the predetermined water level, the number of the concentration management drain mode 30 corresponding to each combustion position of the combustion unit 2 among the set drain valves 21A and 21B. Since the drainage valves 21A and 21B are opened, it is easy to make the amount of water discharged from the drainage unit 5 correspond to the amount of water supplied from the water supply unit 3 that is also set corresponding to the combustion position.

  Further, the concentration management drainage mode 30 is set to the set combustion position from the drainage section 5 when the combustion section 2 is combusting at a lower combustion position (low combustion) than a preset combustion position (medium combustion). Since the amount of water is smaller than the corresponding amount of drainage (20% blow or 12% blow only by the drain valve 21A), the combustion unit 2 is configured to drain the water (8% blow only by the drain valve 21B). Even when combustion is performed at a lower combustion position, the amount of drainage from the drainage unit 5 is appropriately adjusted to reliably prevent the amount corresponding to (or more than) the amount of water supply from the water supply unit 3. The

  Further, the concentration management drainage mode 30 performs the concentration management based on the drainage by the water level management drainage mode 31 and the drainage by the current concentration management drainage mode 30 performed after the previous concentration management drainage mode 30 ends. Since it is configured, the purpose of drainage can be achieved more reliably, and highly accurate blow control without wasteful drainage can be performed.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the drainage unit 5 includes the two drainage valves 21A and 21B, but the number of drainage valves 21 is not limited to this.

  Specifically, three or more drainage valves 21 may be provided as the drainage unit 5. In this case, finer blow control is possible corresponding to the combustion position of the combustion section 2. In addition, the number of drain valves 21 to be used can be properly used according to the water temperature, temperature, and the like. That is, by increasing or decreasing the number of the set drain valves 21 according to the water temperature, the air temperature, etc., the blow control can be performed with higher accuracy and less waste.

  Further, only one drain valve 21 may be provided as the drain part 5. In this case, in order to adjust the amount of drainage, for example, a configuration in which the opening of the valve can be changed may be used.

  Moreover, instead of providing the drain valve 21 as the drainage section 5, a pump for draining water from the can 1 and an electrical connection to the pump, and the amount of drainage from the pump can be adjusted by changing the frequency. An inverter may be used.

In the concentration management drain mode 30, when the combustion position of the combustion section 2 is lower than the set combustion position, only the drain valve 21B of the drain section 5 is opened and limited blow is performed. Instead of 21B, only the drain valve 21A may be opened and limited blow may be performed.
Further, although the drainage amount from the drain valve 21A and the drainage amount from the drain valve 21B are different from each other, these drainage amounts may be the same.

  Further, in the water level management drainage mode 30, when the water level detected by the water level detection unit 4 is equal to or higher than the first set water level WL1, a predetermined amount (maximum drainage amount) of water is drained from the drainage unit 5. The determination is not limited to the maximum amount of drainage.

  Moreover, although the water level detection part 4 was provided with the two water level sensors (the 1st water level sensor 22 and the 2nd water level sensor 23), the number of water level sensors is not limited to this. That is, three or more water level sensors may be provided. In this case, what detects the 1st setting water level WL1 of the water in the can 1 and what detects the 2nd setting water level WL2 should just be selected suitably from several water level sensors.

  When three or more water level sensors are provided in this way, the first set water level WL1 detected by the first water level sensor 22 is set as the upper limit set water level, and the second set water level WL2 detected by the second water level sensor 23 is The lower limit set water level may not be set.

  Further, any of the above-described full blow mode, water level follow-up assist mode, concentration limit mode, concentration upper limit / concentration lower limit value mode, post-blowing suppression mode, and concentration blow mode may not be provided.

DESCRIPTION OF SYMBOLS 1 Can body 2 Combustion part 4 Water level detection part 5 Drainage part 6 Control part 10 Boiler apparatus 21 Drainage valve 21A One drainage valve 21B The other drainage valve 30 Concentration management drainage mode 31 Water level management drainage mode WL1 1st setting water level (upper limit setting) Water level)
WL2 Second set water level (lower limit set water level)

Claims (10)

Can body,
A combustion section having a plurality of staged combustion positions and heating the can;
A water level detector for detecting the water level in the can body;
A drainage section capable of adjusting the amount of drainage from the can body;
A boiler device comprising a control unit,
The control unit includes a concentration management drainage mode and a water level management drainage mode that has priority over the concentration management drainage mode.
In the water level management drainage mode, when the water level detected by the water level detection unit is equal to or higher than a first set water level, a predetermined amount of water is drained from the drainage unit,
The said concentrated management drainage mode is comprised so that the amount of water corresponding to the combustion position of the said combustion part may be drained from the said drainage part. The boiler device according to claim 1,
In the concentrated management drainage mode, when the combustion unit is burning at a combustion position lower than a preset combustion position, water having a smaller amount of water than the drainage amount corresponding to the set combustion position is discharged from the drainage unit. A boiler device configured to drain water. The boiler device according to claim 1 or 2,
The drainage unit includes a plurality of drainage valves,
The controller is
In the case of the water level management drainage mode, if the water level detected by the water level detection unit is equal to or higher than the first set water level, all the preset drainage valves are opened,
In the case of the concentration management drainage mode, the boiler apparatus is configured to open a number of drainage valves corresponding to the respective combustion positions among the set drainage valves. It is a boiler device as described in any one of Claims 1-3,
The water level management drainage mode is configured to close the drainage unit when the water level detected by the water level detection unit is lower than a second set water level lower than the first set water level. . It is a boiler device as described in any one of Claims 1-4,
The concentration management drainage mode is configured to perform concentration management based on drainage by the water level management drainage mode and drainage by the current concentration management drainage mode performed after the previous concentration management drainage mode has ended. A boiler device characterized by that. Can body,
A combustion section having a plurality of staged combustion positions and heating the can;
A water level detector for detecting the water level in the can body;
A drainage unit capable of adjusting the amount of drainage from the can body, and a control method for a boiler device comprising:
A concentration management drainage mode, and a water level management drainage mode that has priority over the concentration management drainage mode,
In the water level management drainage mode, when the water level detected by the water level detection unit is equal to or higher than the first set water level, a predetermined amount of water is drained from the drainage unit,
In the concentration management drainage mode, a control method for a boiler device, wherein water of a water amount corresponding to a combustion position of the combustion section is drained from the drainage section. A boiler device control method according to claim 6,
In the concentration management drainage mode, when the combustion unit is burning at a combustion position lower than a preset combustion position, water having a water amount smaller than the drainage amount corresponding to the set combustion position from the drainage unit. A control method for a boiler device, characterized by draining water. A boiler device control method according to claim 6 or 7,
When the drainage unit includes a plurality of drainage valves,
In the water level management drainage mode, when the water level detected by the water level detection unit is equal to or higher than the first set water level, all the drainage valves set in advance are opened,
In the concentration management drainage mode, the number of drainage valves corresponding to each of the combustion positions among the set drainage valves is opened and drained. It is the control method of the boiler device as described in any one of Claims 6-8,
In the water level management drainage mode, the drainage unit is closed when the water level detected by the water level detection unit is lower than a second set water level lower than the first set water level. It is a control method of the boiler device according to any one of claims 6 to 9,
In the concentration management drainage mode, the boiler performs the concentration management based on the drainage by the water level management drainage mode and the drainage by the current concentration management drainage mode performed after the end of the previous concentration management drainage mode. Control method of the device.

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