JP5671915B2 - Boiler equipment - Google Patents

Description

  The present invention relates to a boiler apparatus having a concentration blow line for preventing scale adhesion in a boiler water pipe.

Conventionally, in a boiler device, in order to prevent the scale from sticking firmly in the boiler water pipe, a water softener is provided in the water supply line to the boiler water pipe to perform water treatment such as reducing the hardness of the water. Yes. The boiler water pipe is provided with a temperature sensor or the like that detects scale adhesion at an early stage.
And if the water softener is malfunctioning or the operation of the boiler device has passed for a certain period of time and there is a concern about the concentration of scale components in the boiler water pipe, in order to prevent scale adhesion in the boiler water pipe, A concentration blow line for forcibly discharging boiler water in the boiler water pipe to the outside is provided (for example, see Patent Document 1).

Also, in the boiler device, in order to prevent overheating of the boiler water pipe and to adjust the generated steam to a predetermined dryness, the amount of water supplied to the boiler water pipe is controlled so as to maintain the water level in the boiler water pipe. (For example, refer to Patent Document 2).
Here, as a method of supplying boiler water into the boiler water pipe, a continuous water supply method that continuously adjusts the supply water amount so as to keep the water level constant, and a water supply for a certain time when the water level falls below a threshold value There is an intermittent water supply system.

JP 2009-192194 A JP 2010-0708204 A

By the way, when the above-described concentration blow line is opened and the boiler water is blown, the boiler water in the boiler water pipe is temporarily reduced. For this reason, there has been a problem that the amount of internal circulation in the boiler water pipe is reduced, and the boiler water pipe is easily overheated.
Moreover, when the water level in a boiler water pipe | tube falls by blow processing, in order to maintain a water level, a lot of water will be supplied in a boiler water pipe | tube from a water supply part. However, since the water supplied from the water supply unit to the boiler water pipe has a relatively low temperature, it takes time to become steam. For this reason, the amount of steam is insufficient, and the boiler water pipe is overheated.

  The present invention has been made in view of the above-described situation, and even when the boiler water in the boiler water pipe is blow-processed, the boiler water pipe can be prevented from being overheated and stable operation can be performed. It aims at providing a boiler apparatus.

In order to solve this problem, a boiler device according to the present invention includes a boiler water pipe, a combustion part that heats the boiler water pipe, a water supply part that supplies water to the boiler water pipe, and a water level in the boiler water pipe. A water level detection unit to detect, a water supply control unit that adjusts the amount of water supplied to the boiler water pipe by the water supply unit so that the water level detected by the water level detection unit becomes a target water level, and boiler water in the boiler water pipe And the water supply control unit determines whether to open the concentration blow line and perform the blow process of the boiler water, and to perform the blow process. Is characterized by raising the target water level in the boiler water pipe.

  In the boiler device having this configuration, when the concentration blow line is opened and the boiler water blow process in the boiler water pipe is performed, the target water level in the boiler water pipe is raised. The amount of water supplied from the water supply unit is increased so that the water level in the water pipe becomes temporarily high. Therefore, even when the boiler water in the boiler water pipe is discharged to the outside by the blow process, it is possible to prevent the occurrence of an overheated state without a shortage of internal circulation. Therefore, it is possible to stably operate the boiler device.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the boiler water in a boiler water pipe is blow-processed, the boiler apparatus which can prevent the overheating state of a boiler water pipe and can perform the stable operation can be provided.

It is a schematic explanatory drawing of the boiler apparatus which is 1st Embodiment. It is expansion explanatory drawing of the boiler water pipe and water level detection part with which the boiler apparatus which is 1st Embodiment was equipped. It is a flowchart of the water level control in the boiler apparatus which is 1st Embodiment. It is a schematic explanatory drawing of the boiler apparatus which is 1st Embodiment. It is an expansion explanatory drawing of the boiler water pipe and water level detection part with which the boiler apparatus which is 2nd Embodiment was equipped. It is a flowchart of the water level control in the boiler apparatus which is 2nd Embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
First, the boiler apparatus 1 which is the 1st Embodiment of this invention is demonstrated.
As shown in FIG. 1, the boiler device 1 includes a boiler body 10, a water supply unit 20, a water supply control unit 27, a water level detection unit 30, a steam / water separation unit 40, and a concentration blow line 50. ing.

The boiler body 10 includes a boiler can body 11, a plurality of boiler water pipes 12, a lower header 13, an upper header 14, and a heating burner 15.
The boiler can body 11 has a cylindrical shape, and a plurality of boiler water pipes 12 are accommodated therein. The boiler water pipe 12 is provided with a scale detection sensor (not shown) for detecting the generation of scale inside.
The plurality of boiler water pipes 12 define a combustion chamber 16 inside the boiler can body 11, and a heating burner 15 is disposed in the combustion chamber 16.

  The heating burner 15 is disposed above the combustion chamber 16 as shown in FIG. A fuel supply line 17 having a fuel supply valve 18 is connected to the heating burner 15, and the combustion amount of the heating burner 15 is controlled by adjusting the opening of the fuel supply valve 18. ing. Note that the amount of steam generated per unit time in the boiler device 1 is controlled by controlling the amount of combustion of the heating burner 15.

The lower header 13 is disposed at the lower part of the boiler can body 11, and the lower ends of the plurality of boiler water pipes 12 are connected to each other. A water supply line 21 of a water supply unit 20 is connected to the lower header 13, and boiler water is supplied from the water supply unit 20.
The upper header 14 is disposed on the upper portion of the boiler can body 11, and the upper ends of the plurality of boiler water pipes 12 are connected to each other. The upper header 14 is configured to store steam generated in the boiler water pipe 12 and is connected to an air / water line 41 for sending out the steam.

The water supply unit 20 includes a water supply line 21 connected to the lower header 13, a water quality measurement unit 22, a water supply pump 23, and a check valve 24. A water softener (not shown) is disposed upstream of the water quality measurement unit 22.
The water quality measurement unit 22 measures the quality of treated water subjected to soft water treatment by a water softener, and particularly measures the hardness, silica concentration, etc. that affect the generation of scale, and determines the presence or absence of water quality abnormality.

  The steam / water separator 40 includes a steam / water line 41 connected to the upper header 14, a steam / water separator 42 that separates moisture from steam supplied through the steam / water line 41, and dry steam from the steam / water separator 42. And a precipitation line 45 for returning the water separated and collected by the steam separator 42 to the lower header 13. Here, the steam delivery line 43 is provided with a flow rate adjusting valve 44 so that the amount of dry steam delivered from the steam separator 42 is adjusted.

A concentration blow line 50 is connected to the precipitation line 45 connecting the steam separator 42 and the lower header 13.
The concentrating blow line 50 includes a concentrating blow valve 51. By opening the concentrating blow valve 51, the boiler water in the boiler water pipe 12 passes through the lower header 13 and the precipitation line 45, and It is configured to be forcibly discharged to the outside.

As shown in FIG. 2, the water level detection unit 30 includes a detector body 31 in which boiler water is stored, a water level sensor 32 disposed in the detector body 31, and a lower end of the detector body 31. And a lower connecting pipe 33 that connects the lower end of the boiler water pipe 12 and an upper connecting pipe 34 that connects the upper end of the detector body 31 and the upper end of the boiler water pipe 12.
The detector main body 31 and the boiler water pipe 12 are connected by the lower connecting pipe 33 and the upper connecting pipe 34, so that the water level inside the detector main body 31 is matched with the water level in the boiler water pipe 12.

  The water supply control unit 27 is configured to give a command to the water supply pump 23 to control the amount of water supplied to the lower header 13 so that the water level detected by the water level sensor 32 of the water level detection unit 30 becomes the target water level. ing. Here, in this embodiment, the continuous water supply system which adjusts the output of the water supply pump 23 so that it may become a target water level, and adjusts the water supply amount per unit time continuously is employ | adopted.

In the boiler apparatus 1 having such a configuration, boiler water is supplied from the water supply unit 20 into the boiler water pipe 12 via the lower header 13. When the heating burner 15 burns in the combustion chamber 16, the boiler water in the boiler water pipe 12 is heated to become steam, and this steam is stored in the upper header 14.
The steam in the upper header 14 is sent to the steam / water separator 42 through the steam / water line 41, and the steam / water separator 42 separates and collects moisture in the steam, thereby obtaining dry steam.

The dry steam obtained in this way is sent to an external steam using device (not shown) through the steam delivery line 43.
Further, the water separated and collected by the steam separator 42 is sent to the lower header 13 through the precipitation line 45 and supplied again into the boiler water pipe 12. In addition, since the water | moisture content isolate | separated and collect | recovered with the steam separator 42 has comparatively high temperature, the temperature of the boiler water in the lower header 13 will rise.

Further, when the boiler device 1 is operated for a certain period of time, the scale component may be concentrated in the boiler water pipe 12, so that the scale may adhere. In addition, when the water softener is malfunctioning, an abnormality in hardness or silica concentration may be detected in the water quality measurement unit 22 provided in the water supply unit 20.
Therefore, when the boiler device 1 is operated for a certain time, the concentration blow valve 51 of the concentration blow line 50 is opened, and the boiler water in the boiler water pipe 12 is forcibly sent to the outside via the lower header 13 and the precipitation line 45. And the boiler water in the boiler water pipe 12 is replaced. This blow treatment prevents the scale from firmly adhering to the boiler water pipe 12.

  Here, the water level detection unit 30 and the water supply control unit 27 monitor the water level in the boiler water pipe 12 and adjust the output of the water supply pump 23 so that the boiler water pipe 12 is not overheated.

Next, the water level control method in the boiler water pipe 12 in the boiler apparatus 1 which is this embodiment is demonstrated with reference to the flowchart shown in FIG.
First, the steam generation amount (combustion amount of the heating burner 15) in the boiler device 1 is confirmed (S01). The target water level is set according to the amount of steam generated (the amount of combustion of the heating burner 15) (S02). Specifically, the target water level corresponding to the amount of steam generated (the amount of combustion of the heating burner 15) is selected from a database prepared in advance. And a water level is measured by the water level sensor 32 of the water level detection part 30, and the output of the water supply pump 23 is controlled in the water supply control part 27 so that it may become a target water level (S03).

And after operation of the boiler apparatus 1 passes for a fixed time, the measurement result of a scale detection sensor or the water quality measurement part 22 is referred, and implementation of the blow process by the concentration blow line 50 is judged (S04).
When the blow process is not performed, the target water level is set according to the steam generation amount (combustion amount of the heating burner 15), and the water level control in the boiler water pipe 12 is continued so as to be the target water level ( S01 to S03).

On the other hand, when the scale detection sensor detects the occurrence of scale or when an abnormality is detected in the water quality measurement unit 22, the concentration blow valve 51 of the concentration blow line 50 is opened to perform the blowing process. Become. In addition, you may perform a blow process whenever the operation time of the boiler apparatus 1 passes for a fixed time.
When performing the blow process, first, the target water level is changed (S05). Specifically, a target water level at the time of blow processing is selected from a database or the like prepared in advance according to the amount of steam generated (combustion amount of the heating burner 15). In the present embodiment, the target water level is changed so as to be higher by a predetermined height (for example, 10 mm) than the target water level during normal operation.

The water level is measured by the water level sensor 32 of the water level detection unit 30 so that the changed target water level (target water level at the time of the blow process) is obtained, and the water supply control unit 27 controls the output of the water supply pump 23 (S06).
And the presence or absence of the stop of the boiler apparatus 1 is confirmed (S07), and when continuing an operation, a target water level is set according to the amount of steam generation (combustion amount of the heating burner 15), and it will become this target water level. Next, the water level control in the boiler water pipe 12 is continued (S01 to S03).

  By performing such control, the target water level at the time of blow processing is set according to the amount of steam generated in the boiler device 1 (combustion amount of the heating burner 15). In addition, the amount of water supplied from the water supply pump 23 per unit time increases.

  In the boiler apparatus 1 according to the present embodiment having such a configuration, when the blow process of the boiler water in the boiler water pipe 12 is performed by opening the concentration blow line 50, the target water level in the boiler water pipe 12 is set. Since the water level is controlled so as to be higher, the amount of water supplied per unit time from the water supply pump 23 is increased so that the water level in the boiler water pipe 12 becomes higher than that during normal operation. Become. Therefore, even when the boiler water in the boiler water pipe 12 is discharged to the outside by the blow process, it is possible to prevent the occurrence of an overheated state without a shortage of the internal circulation amount in the boiler device 1. Therefore, operation of boiler device 1 can be carried out stably.

  In the present embodiment, since the concentration blow line 50 is connected to the precipitation line 45 that connects the steam separator 42 and the lower header 13, when the blow process is performed, the steam separator 42 is used. The separated and recovered water does not return to the lower header 13. For this reason, since the temperature of the water stored in the lower header 13 is lowered, the evaporation of the boiler water is delayed, the amount of internal circulation in the boiler device 1 is reduced, and the boiler water pipe 12 becomes overheated. It becomes easy. For this reason, it is particularly effective to secure the internal circulation amount and prevent the boiler water tube 12 from being overheated by increasing the water level in the boiler water tube 12.

  Moreover, in this embodiment, it is set as the continuous water supply system which the water supply part 20 implements water supply continuously, and adjusts the output of the water supply pump 23 according to the target water level of the boiler water pipe 12, and supplies per unit time Since it is set as the structure which adjusts the amount of water, it becomes possible to change the water level of the boiler water pipe 12 to the target water level after a change (target water level at the time of a blow process) with a sufficient precision.

  Furthermore, in this embodiment, since the water quality measurement part 22 is provided in the water supply part 20, and it is set as the structure by which the hardness and silica density | concentration of the water supplied by this water quality measurement part 22 are measured, a water supply part The malfunction of the water softener disposed upstream of the water 20 can be detected at an early stage, and by performing the blow process at an appropriate timing, it is possible to prevent the scale from adhering to the boiler water pipe 12 in advance. Become.

(Second Embodiment)
Next, the boiler apparatus which is the 2nd Embodiment of this invention is demonstrated.
The boiler device 101 differs from the boiler device 101 according to the first embodiment in the configuration of a water supply unit 120, a water supply control unit 127, and a water level detection unit 130, and the other components are common. Therefore, common members are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the boiler apparatus 101 which is this 2nd Embodiment, as shown in FIG. 4, a boiler main body, the water supply part 120, the water supply control part 127, the water level detection part 130, the steam-water separation part 40, and concentration And a blow line 50.

As shown in FIG. 5, the water level detection unit 130 includes a detector body 131 in which boiler water is stored, an electrode bar 132 disposed in the detector body 131, a lower end of the detector body 131, and a boiler. A lower connecting pipe 133 that connects the lower end of the water pipe 12 and an upper connecting pipe 134 that connects the upper end of the detector main body 131 and the upper end of the boiler water pipe 12 are provided.
The detector main body 131 and the boiler water pipe 12 are connected by the lower connecting pipe 133 and the upper connecting pipe 134, so that the water level inside the detector main body 131 is matched with the water level in the boiler water pipe 12.

  Here, the detector main body 131 is formed of a conductive metal. The electrode rod 132 includes an external connection terminal 135 provided on one end side and an electrode portion 136 provided on the other end side, and the external connection terminal 135 extends from above the detector body 131 to the outside. The electrode portion 136 is disposed in the detector main body 131 so as to protrude from the upper end of the detector main body 131 while being insulated from the detector main body 131 by a cylindrical insulator (not shown). It is drooping.

The water level detection unit 130 is provided with a power supply unit 137 outside the detector main body 131, and one side of the power supply unit 137 is connected to the external connection terminal 135 of the electrode bar 132, and the other end of the power supply unit 137. The side is connected to the detector body 131.
In the water level detection unit 130 configured as described above, when the water level in the detector main body 131 rises and water comes into contact with the electrode unit 136 of the electrode bar 132, the gap between the external connection terminal 135 and the detector main body 131 is increased. Thus, it is possible to detect that the water level has risen to the lower end position of the electrode rod 132.

  The water supply control unit 127 estimates the amount of water supplied from the water level detected by the electrode bar 132 of the water level detection unit 130 to the target water level, adjusts the start timing and start time of the water supply pump 123, and lower header 13 It is set as the structure which controls the amount of water supply to. That is, in this embodiment, the water supply pump 123 is ON / OFF controlled, and an intermittent water supply method is used in which the start timing and start time of the water supply pump 123 are adjusted so as to reach the target water level.

Next, a method for controlling the water level in the boiler water pipe 12 in the boiler apparatus 101 according to the present embodiment will be described with reference to the flowchart shown in FIG.
First, the steam generation amount (combustion amount of the heating burner 15) in the boiler apparatus 101 is confirmed (S11). A target water level is set according to the amount of steam generated (the amount of combustion of the heating burner 15) (S12). The water level is detected by the electrode rod 132 of the water level detection unit 130, and the water supply control unit 127 performs ON / OFF control of the water supply pump 123 so as to reach the target water level (S13). Specifically, when it is detected that the water level is lower than the lower end of the electrode rod 132, the water supply pump 123 is activated at a predetermined timing from the detection of the water level by the electrode rod 132, and after the water supply pump 123 is activated for a certain period of time. Then, the water supply pump 123 is stopped. By confirming in advance the relationship between the water supply time by the water supply pump 123 and the water level fluctuation in the boiler water pipe 12, control to the target water level becomes possible.

And after operation of the boiler apparatus 101 passes for a fixed time, with reference to the measurement result of a scale detection sensor or the water quality measurement part 122, implementation of the blow process by the concentration blow line 50 is judged (S14).
When the blow process is not performed, the target water level is set according to the steam generation amount (combustion amount of the heating burner 15), and the water level control in the boiler water pipe 12 is continued so as to be the target water level ( S11 to S13).

On the other hand, when the scale detection sensor detects the occurrence of scale or when an abnormality is detected in the water quality measurement unit 122, the concentration blow valve 51 of the concentration blow line 50 is opened to perform the blow process. Become. In addition, you may perform a blow process whenever the operation time of the boiler apparatus 101 passes for a fixed time.
When performing the blow process, first, the target water level is changed (S15). Specifically, a target water level at the time of blow processing is selected from a database or the like prepared in advance according to the amount of steam generated (combustion amount of the heating burner 15). In the present embodiment, the target water level is changed so as to be higher by a predetermined height (for example, 10 mm) than the target water level during normal operation.

The water level is detected by the electrode bar 132 of the water level detection unit 130 so that the changed target water level (target water level at the time of the blow process) is obtained, and at the water supply control unit 127, at least the start timing and start time of the water supply pump 123 Either one is changed (S16).
By performing such control, the target water level at the time of blow processing is set according to the amount of steam generated in the boiler device 101 (the amount of combustion of the heating burner 15).

  And the presence or absence of the stop of the boiler apparatus 101 is confirmed (S17), and when continuing an operation, a target water level is set according to the amount of steam generation (combustion amount of the heating burner 15), and it becomes this target water level. Then, the water level control in the boiler water pipe 12 is continued (S11 to S13).

  In the boiler apparatus 101 according to the present embodiment having such a configuration, even if the water supply unit 120 is an intermittent water supply method and the water level detection unit 130 is a water level detection method using the electrode rod 132, the blow process is performed. Sometimes, the water level in the boiler water pipe 12 can be raised, and the occurrence of an overheated state can be prevented without the internal circulation amount in the boiler device 101 being insufficient. Therefore, it becomes possible to stably operate the boiler device 101.

As mentioned above, although the boiler apparatus which is embodiment of this invention was demonstrated, this invention is not limited to this, In the range which does not deviate from the technical idea of the invention, it can change suitably.
For example, although it demonstrated as what connected the concentration blow line to the precipitation line from a steam separator, it is not limited to this, The concentration blow line may be directly connected to the lower header.

In the second embodiment, the water level detection unit has been described as including one electrode rod. However, the present invention is not limited to this, and the water level detection unit may include two or more electrode rods. Good. In this case, the upper limit and the lower limit of the water level can be detected, and the detection accuracy of the water level is improved.
Furthermore, the boiler apparatus of the present invention can be applied to a method for controlling the combustion amount in stages or a method for proportionally controlling the combustion amount.

1,101 Boiler unit 12 Boiler water pipe 15 Heating burner (combustion section)
20, 120 Water supply unit 27, 127 Water supply control unit 30, 130 Water level detection unit 42 Gas-water separator (gas-liquid separator)
45 Precipitation line (return road)
50 Concentrated blow line

Claims (5)

A boiler water pipe, a combustion part for heating the boiler water pipe, a water supply part for supplying water to the boiler water pipe, a water level detection part for detecting the water level in the boiler water pipe, and a water level detected by the water level detection part A water supply control unit that adjusts the amount of water supplied to the boiler water pipe by the water supply unit, and a concentration blow line that discharges boiler water in the boiler water pipe to the outside so that the water level becomes a target water level,
In the water supply control unit, it is determined whether or not to perform the boiler water blowing process by opening the concentration blow line, and when performing the blowing process, the target water level in the boiler water pipe is raised. A boiler device characterized by that.   The said water supply part is made into the continuous water supply system which implements water supply continuously, and adjusts the supply water quantity per unit time according to the said target water level in the said boiler water pipe | tube. The boiler device described.   The water supply unit is an intermittent water supply system that intermittently supplies water, adjusts at least one of a water supply time and a water supply timing according to the target water level in the boiler water pipe, and the boiler water pipe The boiler apparatus according to claim 1, wherein the amount of water supplied to the boiler is adjusted.   The boiler according to any one of claims 1 to 3, wherein a setting of the target water level when the boiler water is blown is changed according to a combustion amount in the combustion section. apparatus. A gas-liquid separator that takes in the steam generated from the boiler water pipe and removes the liquid phase component from the steam, and a reflux path that recirculates the liquid phase component recovered in the gas-liquid separator into the boiler water pipe. Has
The concentration blow line is connected to the reflux path, and when the concentration blow line is opened, the boiler water in the boiler water pipe is discharged to the outside through the return path. The boiler apparatus as described in any one of Claims 1-4 characterized by the above-mentioned.

Images