JP5811530B2 - Controller, boiler and boiler control method - Google Patents

Description

  The present invention relates to a controller capable of suppressing concentration of can water in a boiler, a boiler, and a boiler control method.

  As is well known, when a boiler is operated for a long time, the can water stored in the can is concentrated, causing corrosion inside the can body including the water pipe, a decrease in dryness due to carry over, and the cause of scale adhesion There is a case.

  Therefore, in order to prevent the concentration of can water, a boiler having a concentration blow line for forcibly discharging the concentrated can water may be used (for example, see Patent Document 1).

By the way, when draining canned water from the concentrating blow line and managing canned water, a constant rate blow is widely performed for the purpose of setting the blow rate based on the electrical conductivity of the raw water and achieving an appropriate concentration rate. It is.
The constant rate blow is based on the fact that the concentration of can water has a predetermined relationship with the steam supply state. On the assumption that the steam supply time and the combustion time of the heating burner are equal, a predetermined combustion time (for example, 10 Min)), the blow valve is controlled to open based on the blow rate.

JP 2009-192194 A

However, in actual operation of the boiler, the combustion of the heating burner is because the holding pressure in the so-called number control and the heating burner are frequently started and stopped. In fact, the steam is not steamed and the can water is concentrated. In spite of this, there is a case where concentration blow is performed to cause loss costs of water and energy.
Therefore, there is a strong technical demand for realizing can water management (for example, concentration blow, chemical injection, etc.) according to the actual concentration level of can water.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a controller, a boiler, and a control method capable of appropriately managing can water according to the concentration level of can water in a boiler. To do.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a boiler controller comprising a can body, a heating means for heating the can body, a pressure detection means, and a heating detection means, wherein the pressure detection means detects The boiler is determined to be in a steaming state when the pressure to be performed is equal to or higher than a predetermined pressure and the state of the heating means detected by the heating detection means is a heating state. And

  A fourth aspect of the present invention is a boiler, and includes the controller according to any one of the first to third aspects.

  The invention according to claim 5 is a boiler control method comprising a can body, a heating means for heating the can body, a pressure detection means, and a heating detection means, wherein the pressure detection means detects the boiler body. When the pressure to be performed is equal to or higher than a predetermined pressure and the state of the heating unit detected by the heating detection unit is a heating state, the boiler is in a steam supply state.

According to the controller, the boiler, and the boiler control method according to the present invention, when the pressure detected by the pressure detecting means is equal to or higher than the predetermined pressure, and the heating detecting means detects the heating state of the heating means, Therefore, the steam supply state and the concentration of the can water can be approximated to correspond to each other.

  Invention of Claim 2 is the controller of Claim 1, Comprising: It is comprised so that the steaming time may be calculated based on the time judged to be the said steaming state. .

A sixth aspect of the present invention is the boiler control method according to the fifth aspect of the present invention, wherein the steaming time is calculated based on the steaming time.

According to the controller and the boiler control method according to the present invention, since the steaming time is calculated based on the steaming time, the concentration level of the can water can be grasped by the correspondence with the steaming time. .

According to a third aspect of the invention, a controller of claim 1 or claim 2, e Bei the boiler drainage means, based on between the supply蒸時, it outputs an operation signal to said water discharge means It is comprised so that it may do.

The invention of claim 7 is a control method for a boiler according to claim 5 or claim 6, example Bei the boiler drainage means, actuating said drainage means based between the supply蒸時It is characterized by.

According to the controller and the boiler control method according to the present invention, the drainage means is operated based on the steam supply state of the boiler, so that appropriate can water management can be performed.
Here, based on the steaming time, in addition to the case of the steaming time, a physical quantity having a predetermined relationship (for example, a function including a constant) with the steaming time, for example, the time indicating the steaming state and the amount of evaporation This includes a case where a physical quantity weighted with the above and a case where natural evaporation associated with various factors (for example, combustion amount, standby time, etc.) is taken into consideration.

  According to the controller, the boiler, and the control method according to the present invention, the steam supply state is set based on the steam pressure and the heating state of the heating means. Can be controlled, and as a result, proper water management can be performed.

It is a longitudinal section showing a schematic structure of a boiler concerning one embodiment of the present invention. It is a flowchart explaining the effect | action of the boiler which concerns on one Embodiment. It is a conceptual diagram explaining the effect | action of the boiler which concerns on one Embodiment.

Hereinafter, a boiler 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a diagram showing a schematic configuration of a small once-through boiler 1 according to an embodiment, and FIG. 2 is a flowchart for explaining the operation of concentration blow control of the boiler 1.
As shown in FIG. 1, the boiler 1 includes a boiler body 10, a water supply unit 20, a water level detection unit 30, a steam / water separation unit 40, a concentration blow line (drainage means) 50, and a control unit (controller). 60).

The boiler body 10 is formed in a cylindrical shape, and includes a can body 11 and a heating burner (heating means) 15.
The can body 11 includes a plurality of can water pipes 12, a lower header 13, and an upper header 14. The upper header 14 detects a pressure (hereinafter referred to as can body pressure) P (t) in the can body. 14S is provided, for example, the can water pipe 12 is provided with a scale detection sensor (not shown) for detecting the generation of scale inside.

The plurality of can pipes 12 are configured such that a combustion chamber 17 is defined inside the can body 11, a heating burner 15 is disposed in the combustion chamber 17, and the heating burner 15 is disposed in the combustion chamber 17. By burning, the can water in the can water pipe 12 is heated to become steam, and this steam is stored in the upper header 14.
Further, the combustion state (heating state) of the heating burner 15 is detected by a flame detection sensor (heating detection means) 16 disposed in the heating burner 15.

  The heating burner 15 is disposed above the combustion chamber 17 as shown in FIG. A fuel supply line 18 having a fuel supply valve 19 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 19. ing. Note that the amount of steam generated per unit time in the boiler 1 is controlled by controlling the amount of combustion of the heating burner 15.

The lower header 13 is disposed at the lower portion of the can body 11, and the lower ends of the plurality of can 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 water is supplied from the water supply unit 20.
The upper header 14 is disposed on the upper portion of the can body 11, and the upper ends of the plurality of can water pipes 12 are connected. The upper header 14 stores steam generated in the can water pipe 12, and steam in the upper header 14 passes through a steam / water line 41 connected to the upper header 14. The steam in the steam is separated and collected in the steam separator 42 to obtain dry 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, a check valve 24, and a flow rate adjustment valve 25. A water softener (not shown) is disposed upstream of the water quality measurement unit 22.
The water quality measurement unit 22 measures, for example, the quality of treated water that has been softened by a water softener. The total dissolved salt concentration that affects carry-over, hardness that affects the generation of scale, silica concentration, acid One or more items selected from the consumption level (pH 4.8) or the like are measured, and a signal is output to the control unit 60.

The water level detection unit 30 includes a water level sensor 32 disposed in a detector main body 31 in which can water is stored, a lower connecting pipe 33 that connects the lower end of the detector main body 31 and the lower end of the can water pipe 12. The upper connecting pipe 34 connecting the upper end of the detector body 31 and the upper end of the can water pipe 12 is provided.
The detector main body 31 and the can 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 matches the water level in the can water pipe 12.

  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. The steam delivery line 43 is provided with a flow rate adjustment 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 concentration blow line 50 is provided with a concentration blow valve 51. By opening the concentration blow valve 51, the can water in the can water pipe 12 passes through the lower header 13 and the precipitation line 45 to the outside of the boiler 1. It is configured to forcibly discharge.

  The control unit 60 includes an input unit 61, a memory (not shown), a calculation unit 62, and an output unit 63. The input unit 61, the calculation unit 62, and the output unit 63 communicate data and the like through communication lines. They are connected to each other, and control the combustion of the heating burner 15, the amount of water supplied to the can 11, and the concentrated blow drainage.

  The input unit 61 includes, for example, a data input device such as a keyboard (not shown) so that settings and the like can be output to the calculation unit 62. The in-can pressure sensor 14S, the flame detection sensor 16, and the water level detection unit 30 It is connected to the water level sensor 32 by a signal line 65, and outputs signals input from the can body pressure sensor 14 </ b> S, the flame detection sensor 16, and the water level sensor 32 to the calculation unit 62.

The calculation unit 62 reads and executes a program stored in a storage medium (for example, ROM) of a memory, calculates a steaming time T based on an input from the input unit 61, and performs drainage control of the concentration blow line 50. It is supposed to be.
In addition, the calculation unit 62 adjusts the flow rate adjustment valve 25 based on the water level detected by the water level sensor 32 of the water level detection unit 30, for example, so that the water level in the can 11 becomes the target water level. The water supply to 13 is controlled.

  The output unit 63 is connected to the fuel supply valve 19, the flow rate adjustment valve 25, and the concentration blow valve 51 through a signal line 66, and outputs a signal from the calculation unit 62 to the fuel supply valve 19, the flow rate adjustment valve 25, and the concentration blow valve 51. It is supposed to be.

  With this configuration, when the boiler 1 is operated to generate steam and the steaming time T in the operation of the boiler 1 is equal to or greater than the drainage set time TS, the concentration blow valve 51 of the concentration blow line 50 is opened, Concentration of can water is suppressed by forcibly discharging the can water in the can body 11 to the outside through the lower header 13 and the precipitation line 45 and replacing the can water.

Hereinafter, with reference to FIG. 2, the effect | action of the boiler 1 which concerns on one Embodiment is demonstrated.
FIG. 2 is a flowchart showing an example of the concentration blow control related to the boiler 1.
(1) First, a set pressure (predetermined pressure) PS and a drainage set time TS for determining the steam supply state are set, and initial values (= 0) are set for the can pressure P (t) and the steam supply time T, respectively. ) Is set (S1).
(2) It is determined whether the boiler group 2 is in operation (S2).
When the boiler group 2 is operating, the process proceeds to S3, and when the operation is stopped, the program is terminated.
(3) The computing unit 62 determines whether the heating burner 15 is in combustion based on the signal from the flame detection sensor 16 input via the input unit 61 (S3).
(4) The calculation unit 62 acquires the can body pressure P (t) detected by the can body pressure sensor via the input unit 61 (S4).
(5) The computing unit 62 determines whether or not the in-can pressure P (t) ≧ the set pressure PS is satisfied.
If the can internal pressure P (t) ≧ the set pressure PS is satisfied, the process proceeds to S6. If not satisfied, the process proceeds to S2.
(6) The computing unit 62 calculates the steaming time T by, for example, integrating a timer (not shown) (S6).
(7) The calculation unit 62 determines whether or not the steaming time T ≧ drainage setting time TS is satisfied (S7).
If the steaming time T ≧ drainage set time TS is satisfied, the process proceeds to S8. If not satisfied, the process proceeds to S2.
(8) The calculation unit 62 resets the steaming time T by setting the steaming time T to zero (S8).
(9) The computing unit 62 opens the drain valve 51 via the output unit 63 and drains the concentrated water (S9).
(10) The computing unit 62 determines whether drainage is completed based on, for example, whether the water level acquired from the water level detection unit 30 has decreased to a predetermined water level (S10).
If the drainage is completed, the process proceeds to S2. If the drainage is not completed, the process returns to S10 and is repeated until the drainage is completed.
The above steps (2) to (10) are repeated.

Next, the operation of the boiler 1 will be described with reference to FIG.
FIG. 3 is a conceptual diagram for explaining the relationship among the pressure P (t) in the boiler of the boiler 1, the combustion state of the heating burner 15 (combustion presence / absence), the steam supply state, and the steam supply time T, and the horizontal axis represents time t. Show.
In FIG. 3, the pressure in the can P (t) is shaded as to whether it is greater than or less than the set pressure PS, the combustion state is based on the presence or absence of combustion (ON-OFF), and the steaming state is the timing of steaming by hatching The steaming time is a cumulative time based on the steaming state, and is indicated by a line segment indicated by a symbol T.

Hereinafter, the relationship between the pressure t (t) in the can, the steam supply state, and the steam supply time T in each time from zero to t1 to t7 to t8 will be described. The timing based on the code | symbol described in the horizontal axis | shaft of 3 is shown.
<Zero to t1>
Since the in-can pressure P (t) is less than the set pressure PS and the combustion state is OFF, the steam supply state is not present and the steam supply time T remains zero.
<T1-t2>
Since the can body pressure P (t) is equal to or higher than the set pressure PS and the combustion state is ON, the steam supply state is established, and the steam supply time T is integrated with time.
<T2-t3>
The pressure in the can P (t) is equal to or higher than the set pressure PS, but since the combustion state is OFF, there is no steam supply state and the steam supply time T remains unchanged.
<T3 to t4>
Since the in-can pressure P (t) is less than the set pressure PS and the combustion state is OFF, it is not in the steaming state and the steaming time T remains unchanged.
<T4 to t5>
The pressure in the can P (t) is less than the set pressure PS, the combustion state is ON, but not in the steaming state, and the steaming time T remains unchanged.
<T5 to t6>
Since the can body pressure P (t) is equal to or higher than the set pressure PS and the combustion state is ON, the steam supply state is established, and the steam supply time T is integrated with time.
Here, the reason why the steaming time T has moved to zero according to the arrow is that the steaming time T has reached the drainage set time TS, so the concentrated blow drainage has been carried out and the steaming time T has been reset. Is shown.
<T6-t7>
Although the pressure in the can P (t) is equal to or higher than the set pressure PS, since the combustion state is OFF, the steam supply state is not present and the steam supply time T remains zero.
<T7 to t8>
Since the can body pressure P (t) is equal to or higher than the set pressure PS and the combustion state is ON, the steam supply state is established, and the steam supply time T is integrated with time.

  According to the boiler 1 which concerns on one Embodiment, since can water management is performed corresponding to the steaming time T, appropriate can water management which approximates the concentration degree of can water can be performed.

  According to the boiler 1, since the steam supply state is set when the pressure is equal to or higher than the set pressure PS and the flame detection sensor 16 detects the combustion of the heating burner 15, the steam supply state and the concentration level of the can water are approximated. Can be made. As a result, appropriate can water management can be performed.

  Moreover, according to the boiler 1, since the concentration blow line 50 is operated based on the steam supply time T, it is possible to perform appropriate concentration blow drainage according to the concentration level of the can water.

The boiler 1 according to the embodiment of the present invention has been described above, but the present invention is not limited to this, and can be appropriately changed without departing from the technical idea of the present invention.
For example, in the above embodiment, the case where the boiler 1 includes the concentration blow line 50 has been described. However, the present invention may be applied to a boiler that does not include the concentration blow line 50.
Moreover, it may replace with the concentration blow line 50, and may be applied to the boiler 1 provided with the chemical injection device etc. which inject | pour a chemical | medical agent into can water with the concentration blow line 50. FIG. Moreover, you may apply to the boiler provided with can water management means other than the concentration blow line 50, a chemical injection device, etc.

  In the above-described embodiment, the case where the concentrated blow drainage is performed according to the steaming time T has been described. Concentrated blow drainage may be performed based on a physical quantity obtained by weighting the indicated time and the evaporation amount, or based on a physical quantity considering natural evaporation associated with various factors (for example, combustion amount, standby time, etc.).

Moreover, in the said embodiment, although the case where the pressure P (t) in a can was used as a predetermined pressure at the time of determining with a steam supply state was demonstrated, for example, the steam header which collects the steam of a plurality of boilers May be used.
Further, although the case where the set pressure PS is used as the predetermined pressure has been described, for example, the pressure calculated in the control unit 60 or the like may be used according to the operation state of the boiler 1 and various parameters.

In the above embodiment, the case where the heating detection means is the flame detection sensor 16 has been described. However, instead of the flame detection sensor 16, another heating detection means such as a thermocouple may be used, or a heating burner. It may be based on 15 control signals or the like.
Moreover, in the said embodiment, although the case where a heating means was the heating burner 15 was demonstrated, it is also possible to apply to the boiler provided with other heating means, such as a heater, for example.

  Further, in the above embodiment, the case where the boiler is a small once-through steam boiler has been described, but in addition to the small once-through boiler, a multi-tube boiler in which water tubes are arranged in an annular shape, a furnace flue tube boiler, and the like The present invention may be applied to boilers having various structures.

  Further, for example, the description has been made assuming that the concentration blow line 50 is connected to the precipitation line from the steam separator 42, but the present invention is not limited to this, and the concentration blow line 50 is directly connected to the lower header 13. It may be.

  An example of the schematic configuration of the program according to the present invention is shown as a flowchart in FIG. 2, but the program may be configured using a method (algorithm) other than the above flowchart, for example, from an analog computer It goes without saying that a controller may be used.

  According to the control unit, the boiler, and the control method according to the present invention, the boiler water can be appropriately managed according to the degree of concentration, and thus can be industrially utilized.

DESCRIPTION OF SYMBOLS 1 Boiler 11 Can body 14S Can body pressure sensor (pressure detection means)
15 Heating burner (heating unit)
16 Flame detection sensor (heating detection means)
50 Concentration blow line (drainage means)
60 Control unit (controller)

Claims (7)

Can body,
Heating means for heating the can body;
Pressure detecting means;
A boiler controller comprising heating detection means,
The pressure detected by the pressure detecting means is equal to or higher than a predetermined pressure;
And when the state of the heating means detected by the heating detection means is a heating state,
A controller configured to determine that the boiler is in a steam supply state. The controller of claim 1, comprising:
A controller configured to calculate a steaming time based on the time determined to be the steaming state. The controller according to claim 1 or 2, wherein
The boiler example Bei drainage means,
A controller configured to output an operation signal to the drainage means based on the steaming time.   A boiler comprising the controller according to any one of claims 1 to 3. Can body,
Heating means for heating the can body;
Pressure detecting means;
A heating control means, a boiler control method comprising:
The pressure detected by the pressure detecting means is equal to or higher than a predetermined pressure;
And when the state of the heating means detected by the heating detection means is a heating state,
Method of controlling a boiler, wherein the boiler is to be fed steam state. The boiler control method according to claim 5,
A boiler control method, wherein a steam supply time is calculated based on the time of the steam supply state. A boiler control method according to claim 5 or claim 6,
The boiler example Bei drainage means, the control method of the boiler, characterized in that actuating said drainage means based between the supply蒸時.

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