JP2003343805A - Condensate supply method for boiler system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently recover heat from condensate. <P>SOLUTION: A condensate supply method in a boiler system 1 comprising: a boiler 2 for heating feedwater to generate steam; a water supply part 3 for supplying feedwater to the boiler 2; a steam supply part 5 for supplying steam generated in the boiler 2 to load equipment 4; and a condensate supply part 6 for supplying steam used in the load equipment 4 to the water supply part 3 as condensate, includes a measurement step of measuring the water temperature of condensate condensed in the condensate supply part 6, and a determination step of determining whether to supply condensate in the condensate supply part 6 to the water supply part 3 according to the measurement result by the measurement step. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler
Water supply method, in particular, heating the feed water to produce steam
Boiler to be generated and water supply section for supplying water to this boiler
And steam for supplying steam generated by the boiler to load equipment.
Air supply unit, and steam used in the load device as condensate
A boiler device including a condensate supply unit that supplies the water to the water supply unit
Condensate supply method in Japan. [0002] 2. Description of the Related Art A boiler apparatus uses steam generated from a boiler.
Used in the load equipment, this vapor lost latent heat and condensed
Equipped with a condensate supply path to supply water to the water tank as condensate
ing. However, the disadvantage of supplying condensate is that the iron content is high.
Existing in the boiler water pipes,
Deposit corrosion caused by accumulation of iron on steel
Have the potential. Also contains dissolved oxygen and carbon dioxide gas.
The water supply system and boiler water pipes.
May cause. On the other hand, as an advantage of supplying condensate,
Water has sensible heat and is supplied to the water tank
It can save energy if it is reused as water supply. [0004] However, at the initial stage of starting the boiler, low load operation is performed.
Condensate when heat recovery is performed to the maximum with load equipment
Has a low water temperature and has little heat. That
Therefore, the above condensate can save energy even if it is supplied.
Not only do not tie, but also
Formation and corrosion. [0005] SUMMARY OF THE INVENTION The present invention provides
In view of the above, it is an object to efficiently recover condensate heat. [0006] The present invention solves the above problems.
It has been made to solve the problem, and has been described in claim 1
The invention provides a boiler that heats feed water to produce steam,
A water supply unit for supplying water to the boiler;
A steam supply unit for supplying steam to a load device;
Steam supplied to the water supply section as condensate
Condensate supply method in a boiler device equipped with a water supply unit
And the temperature of the condensate condensed in the condensate supply unit.
Measuring step of measuring the measurement result in the measuring step
The condensate in the condensate supply section is supplied to the water supply section based on
Determination step of determining whether or not to supply. [0007] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.
The boiler device according to the embodiment will be described. In FIG.
A boiler 2 that heats feed water to generate steam
And a water supply device 3 (water supply unit) for supplying water to the boiler 2
Example), load equipment 4 using steam, and the boiler
Steam pipe 5 for supplying the steam generated in 2 to the load equipment 4
(An example of a steam supply unit) and the steam used in the load device 4.
Condensate piping 6 for supplying air to the water supply device 3 as condensate
(One example of a condensate supply unit) and a condensate supply unit
A switching valve 7 for switching between supply and disposal of water;
Mainly equipped with a water temperature measuring device 8 for measuring the condensate water temperature in 6.
I have. The water supply device 3 supplies water to the boiler 2.
For this purpose, make-up water injection channel 9 and
A water supply tank 10 for storing water supply;
Water supply path 11 for supplying the water stored in the boiler 2
(See FIG. 1). Where the irrigation channel
9 includes a water softener 12 and a deoxygenator 13 in this order.
Each has it. The water softening device 12 is provided with
Such as calcium ions and magnesium ions
Replaces hardness components with sodium ions and converts them to soft water
Things. On the other hand, the deoxygenation device 13
The dissolved oxygen contained therein is mechanically removed. Ma
In addition, the water supply channel 11 sends out water to the boiler 2.
A water supply pump 14 is provided. [0009] The load device 4 is provided with the steam from the boiler 2.
The required heat exchange using air, that is, the boiler
A load device in the device 1, which is downstream of the steam pipe 5.
Connected to the side. The switching valve 7 is used to return water to the water supply device 3.
In order to switch between supply and disposal, as shown in FIG.
The condensing pipe 6 is provided. And the switching valve
7 and the first port 15 and the second port 16
The condensate is supplied via the condensate supply passage 17 to the water supply tank.
Supplied to the client 10. A first port of the switching valve 7;
Condensate by connecting 15 and the third port 18
Is discarded from the condensate disposal passage 19. The water temperature measuring device 8 is provided in the condensate pipe 6.
In order to measure the water temperature of the condensate,
And is provided in the measurement sample supply path 20 (see FIG. 1).
See). As shown in FIG. 2, the water temperature measuring device 8
A cell 21, a measuring device 22, and a control device 23 are mainly provided.
I have. The measuring cell 21 has a control device 23
It has. In addition, on the side surface of the measurement cell 21,
A sample introduction path 24 connected to the measurement sample supply path 20 is provided.
Have been killed. The sample introduction path 24 is provided for the measurement sample supply.
The filter 25 and the solenoid valve 26 are sequentially arranged from the supply path 20 side.
Each of which is provided with the condensate pipe 6 and the measurement sample.
The condensate supplied through the supply path 20 is supplied to the measuring cell 21.
It is set to be able to be supplied inside. In addition, the measurement cell 2
A sample discharge path 2 for discharging the measurement sample to the outside
7 are provided. The measuring device 22 is provided in the measuring cell 21.
Condensate (hereinafter referred to as “condensate sample”) stored in
The temperature is measured, and the condensate test in the measurement cell 21 is performed.
A water thermometer 28 is provided in the sample. The control device 23 is provided with the water temperature measuring device 8.
The operation is controlled as shown in FIG.
It mainly has a device 29 and an input / output port 30. this
The arithmetic unit 29 includes a central control unit 31 (hereinafter, “CPU 3
1 ". ), The operation program of the control device 23
The stored read-only storage device 32 (hereinafter referred to as “RO
M32 ". ) And readable / writable storage device 33
(Hereinafter, referred to as “RAM 33”). On the other hand, the input side of the input / output port 30
Are switches 34 for the operator to input operating conditions and the like.
The water temperature gauge 28 and the like are connected. Also, its output side
The LCD 35 for displaying measurement results and the like, the electromagnetic valve 2
6 are connected. The control device 23 stores information in the ROM 32.
According to the operation program remembered, the arithmetic unit 2
9 shows various information input through the input / output port 30.
The arithmetic processing is performed while appropriately storing the information in the RAM 33,
The arithmetic unit 29 is based on the arithmetic result obtained therefrom.
Various operation commands through the input / output port 30.
It is set to transmit to members. Next, the operation of the boiler device 1 will be described.
In addition, a condensate supply method of the boiler device 1 will be described.
You. When the boiler device 1 is operated, the water supply passage 9 is used.
Supply water to the water supply tank 10 from the
Is stored in the water supply tank 10 as water supply to the boiler 2.
To stay. Here, the stored water is supplied from the water softening device 1.
2 and the one treated by the deoxidizer 13
It is soft water deoxygenated. And the water supply pump 1
4 to operate the water supply stored in the water supply tank 10.
The water is supplied to the boiler 2 through the water supply channel 11. The water is supplied to the boiler 2 through the water supply channel 11.
The supplied water is stored in the boiler 2 as boiler water
Is done. The boiler water stored in the boiler 2
Is heated and gradually turns into steam. The generated steam is
It is supplied to the load device 4 through the steam pipe 5. Previous
The steam supplied to the load device 4 is then cooled and recovered.
It becomes water and is supplied to the water supply tank 10. By the way, at the initial stage of starting the boiler 2, a low
During load operation, when heat recovery is performed to the maximum with load equipment, etc.
Condensate has low water temperature and has almost all the heat to be recovered
You may not. Therefore, the above condensate
Supplying water will not only save energy.
And can easily cause scale formation and corrosion
There is. Therefore, the boiler device 1 is provided with the water temperature measurement.
The temperature of the condensed water in which the steam is condensed by the
Measure every interval. Then, the water temperature is measured by the water temperature measurement device 8.
Measure, if it is determined that the water temperature is high, the condensate
Before the switching valve 7, the water is supplied to the condensate supply passage 17.
The first port 15 communicates with the second port 16
Then, the water is supplied to the water supply tank 10. Conversely, the water temperature measurement
When the water temperature is measured by the fixing device 8 and it is determined that the water temperature is low
So that condensate is supplied to the condensate waste passage 19,
The first port 15 and the third port 1 of the switching valve 7
8 and discarded. Hereinafter, FIG. 4 and FIG.
This operation is described in detail according to the operation flowchart
explain. When the operation of the boiler device 1 is started,
In step S1, the program is executed by the control device 2
The elapsed time t of the internal timer of No. 3 is set to zero (0),
In the next step S2, when the elapsed time t is constant.
Interval t₁Is determined. Elapsed time t is constant
Time t₁, The program moves to step S3
Then, the elapsed time t is reset to zero (0). Here
And a certain time t₁Is usually about 0.01 to 10 hours
Time. After step S3, the program proceeds to step
Move to S4 and measure the condensate water temperature
About). Here, the solenoid valve 26 is opened and the measurement cell is opened.
In the area 21, a predetermined amount of water is returned to the water level indicated by the broken line in FIG.
Store the water as a condensate sample. The water level indicated by the broken line in FIG.
When the condensate is stored in the above, the electromagnetic valve 26 is closed and the condensate is condensed.
Stop supplying. Thereby, the measuring cell 21
The inflow of condensate water is cut off, and in the measurement cell 21,
A predetermined amount of condensate up to the water level indicated by the broken line in FIG.
Is stored. In this state, the measuring device 22 is activated.
Then, the water temperature is measured by the water temperature meter 28. And the system
The control device 23 displays the water temperature in the condensate sample on the LCD 35.
Show. After the water temperature measurement step as described above, the program
The program moves to step S5, and in this step S5
To determine whether to supply condensed water to the water supply tank 10.
(Determination step). In the water temperature measurement process of step S4
And the water temperature is set at a preset value, for example, 80 ° C. or higher.
Measured (ie, the condensate sample is measured as hot)
), The program proceeds from step S5 to step S9.
And the condensate supply identification flag of the CPU 31 is turned on.
(ON) is determined. Condensate supply identification flag
Is ON, the program returns to step S2.
You. When the condensate supply identification flag of the CPU 31 is off (OF
In the case of F), in the subsequent step S10,
Implement the process. In the condensate supply step, the control unit 23
Are connected to the first port 15 and the second port of the switching valve 7.
16 and the flow path of the condensate pipe 6
Switch to the water supply path 17 side. As a result, the condensate distribution
Condensate in the pipe 6 is supplied to the water supply tank 10.
Become. Here, the switching valve 7 is connected to the control device 2.
Unless a switching command is received from the first port 1
5 and the second port 16, and the condensate supply
Condensed water is continuously supplied to the supply path 17 side. As a result, the condensate pipe 6
Since the condensate supplied to the tank 10 has sensible heat,
The water supply in the water supply tank 10 is heated to increase the water supply temperature.
Can be After the end of step S10, the step
The process proceeds to step S11, and the condensate supply
Is set to ON, and the program proceeds to step S2
Return to On the other hand, in the water temperature measurement process of step S4,
And the water temperature is set at a preset value, for example, less than 80 ° C.
(I.e., if the condensate sample is measured as cold)
The program moves from step S5 to step S6.
(See FIG. 5), and the condensate supply
Is turned on (ON). Condensate supply
If the other flag is off (OFF), the program
Return to step S2. On the other hand, in step S6,
If the supply identification flag is on (ON), the program
Proceeding to step S7, the first port 1 of the switching valve 7
5 and the third port 18 to communicate with each other,
Switch to the condensed water disposal path 19 side. As a result, the
The condensate in the water pipe 8 is supplied to the condensate disposal path 19 side.
Discarded. As a result, condensate with lower water temperature is discarded
Will be. After the end of step S7, the program
The process proceeds to step S8, and the condensate supply identification flag is turned off (OF
Set to F). Then, the process returns to step S2. Then, the program proceeds to step S2.
Has been reset to zero (0) in step S3
Time t is constant time t₁Is determined. Soshi
And the elapsed time t is a certain time t₁Once you reach
Step S4 and subsequent steps are repeated. Therefore, the boiler device
In 1, the fixed time t₁The temperature of the condensed water is measured every time
Is determined, and based on the results,
Will be supplied to the client 10. For example, in step S4, condensate
Even if the temperature is measured as high,
Condensate was measured as low temperature in step S4 in
In this case, the program moves from step S5 to step S6.
Run. Here, in step S9, the condensate water supply
Because another flag is set to ON,
Ram moves from step S6 to step S7 and step S8.
Then, the process returns to step S2. Therefore, the first port
The port 15 communicates with the third port 18, and the condensate
Condensate supply from the pipe 6 to the condensate disposal path 19 is started.
Will be. Conversely, in step S4, condensate
Even if it is measured as low temperature,
If high temperature is measured in step S4,
The program moves from step S5 to step S9,
From step S10 to step S11 via step S11
Go back to 2. Therefore, the first port 15 and the second port 15
Port 16 and the condensate supply line
The supply of the condensed water to the supply path 17 is started. On the other hand, in step S4, the condensate
Temperature and measured in step S4 of the next repetition process.
If it is determined that the temperature is too high, the program proceeds to step S5.
From step S9 to the first port 15
The communication with the second port 16 is continued, and
The supply of condensed water to the condensed water supply path 17 is continued. As described above, in the boiler apparatus 1,
Is continuous or regular, independent of the condensate temperature
Instead of supplying condensed water to the water supply tank 10,
If water is measured at high temperature, ie above the set value
Only from the condensate pipe 6 to the first port of the switching valve 7.
The port 15 communicates with the second port 16 and the condensate
Supplying to the water supply tank 10 via the supply path 17
The heat recovery of condensate can be performed efficiently.
You. [Other Embodiments] (1) In the above embodiment, the fixed time t₁Elapses
The condensate water temperature is measured every time, and based on the results,
Although the water is supplied to the water supply tank 10,
Can be changed according to the situation. For example, in FIG.
As shown, after step S8 of the operation flowchart,
Step S12 is further set, and in step S3
The elapsed time t reset to zero (0) is another fixed time t
_TwoIs determined. Then, step S1
The elapsed time t is constant time t at 2 _TwoHas reached
If so, the program proceeds to step S3.
Set as follows. Where t_TwoIs t₁When shorter than
Between. In this case, the boiler device 1 includes a step
If it is determined in S4 that the condensate water temperature is high,
Fixed time t₁The condensate water temperature is measured every time
If the condensate water temperature is measured to be low in step S4
If it is, a shorter fixed time t_TwoMeasures condensate water temperature every time
Efficient recovery of condensate heat
Can be. (2) Used in the above embodiment
The water temperature measuring device 8 automatically determines the water temperature during condensing.
Change to another form if you can
You can also. (3) In the above embodiment, the boiler
The apparatus 1 is provided with the water temperature measuring device 8, and the water temperature measuring device
Based on the condensate water temperature automatically determined in step 8,
The condensate is supplied to the condensate supply passage 17 by switching the switching valve 7.
Supply to the water supply tank 10 through the
The condensate supply method of the present invention is not limited to this.
No. For example, the condensate water temperature is measured manually and the
Based on the measurement result, the switching valve 7 is switched to condense water.
Supply to the water supply tank 10 via the condensate supply path 17
can do. (4) In the above embodiment, the water temperature
The measuring device 8 is provided in the measurement sample introduction path 20.
However, the condensate supply method of the present invention is not limited to this.
is not. For example, the water temperature measuring device
The arrangement 8 can be provided directly. [0038] As described above, according to the present invention, condensate
Heat can be efficiently recovered.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a boiler device applied to an embodiment of the present invention. FIG. 2 is a schematic diagram of a water temperature measuring device used in the boiler device. FIG. 3 is a diagram showing a schematic configuration of a control device portion of the water temperature measuring device. FIG. 4 is a flowchart showing a condensate supply operation process in the boiler device. FIG. 5 is a flowchart showing a condensate supply operation process in the boiler device. FIG. 6 is a flowchart of another embodiment showing a condensate supply operation step in the boiler device. [Description of Signs] 1 Boiler device 2 Boiler 3 Water supply unit 4 Load equipment 5 Steam supply unit 6 Condensate supply unit

Claims (1)

Claims: 1. A boiler for producing steam by heating feed water.
A water supply unit 3 for supplying water to the boiler 2, a steam supply unit 5 for supplying steam generated by the boiler 2 to a load device 4, and a water supply unit using steam used in the load device 4 as condensate water. A condensate supply method for the boiler apparatus 1 including a condensate supply unit 6 for supplying the condensate water to the condensate supply unit 6. A determining step of determining whether to supply the condensed water in the condensed water supply unit 6 to the water supply unit 3 based on the measurement result.