JP2002327904A - Steam boiler device and method for operating steam boiler device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a corrosion inhibitor, suppressing corrosion of the steam piping and condensate piping of a steam boiler device, without waste, and besides to stably operate the steam boiler device. SOLUTION: The steam boiler device 1 comprises a steam boiler 3 to heat feed water to generate steam; a load device 4 to utilize steam generated at the steam boiler 3; steam piping 5 through which steam generated at the steam boiler 3 is fed to the load device 4; condensate piping 6 to recover condensate obtained by condensing steam utilized at the load device 4 and mix it in feed water; and a filling device 7 to fill the steam piping 5 with a necessary amount of the corrosion inhibitor. The filling device 7 adjustably sets a necessary amount of the corrosion inhibitor according to an amount of steam generated at the steam boiler 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler device and a method for operating a boiler device, and more particularly to a steam boiler device and a method for operating a steam boiler device.

[0002]

2. Description of the Related Art As a steam boiler device, a steam boiler that generates steam by heating feed water, a load device that uses steam generated by the steam boiler, and a load device that uses steam generated by the steam boiler to a load device And a condensing pipe for collecting condensed water obtained by condensing the steam used in the load device and mixing it with the water supplied to the steam boiler. Have been. Such a steam boiler can reuse steam supplied to the steam boiler while circulating the steam supplied to the load device as condensate water, thus reducing the amount of makeup water and enabling economical operation. become.

[0003] Incidentally, since steam pipes and condensate pipes used in this type of steam boiler apparatus are mainly made of steel pipes, there are cases where replacement is required due to corrosion. It is understood that corrosion of steam pipes and condensate pipes is mainly caused by the influence of bicarbonate ions and dissolved oxygen contained in the water supply to the steam boiler. Corrosion caused by bicarbonate ions is caused by the carbon dioxide gas generated by the thermal decomposition of feedwater containing bicarbonate ions in the steam boiler, which lowers the pH of steam and condensate, and comes into contact with the condensate. Since it progresses evenly to the inner surface portion of the pipe, thereby reducing the thickness of the pipe, it has the characteristic that the progress speed is relatively slow. Corrosion caused by dissolved oxygen, on the other hand, is a phenomenon in which steam or oxygen dissolved in condensate is partially intensively corroded to the lower part where sludge is deposited, such as the lower part of piping, especially horizontal piping. And lead to corrosive corrosion (pitting) from the inside to the outside of the pipe, so that the speed of progress is relatively high, causing fatal damage to the condensate pipe in a short time. Have.

For this reason, in the above-mentioned steam boiler, a neutralizing agent for neutralizing carbon dioxide in steam or condensate, or an anticorrosive film on the inner surface of steam pipe or condensate pipe is formed. An operation method of injecting a chemical such as a film forming agent (corrosion inhibitor) into water supplied to a steam boiler has been implemented. Of the corrosion inhibitors injected into the feedwater in this way, the neutralizer neutralizes the carbon dioxide gas generated in the steam boiler and suppresses the decrease in the pH of steam and condensate. Physical corrosion can be effectively suppressed. On the other hand, since the film-forming agent is supplied into the steam pipe together with the steam, it forms an anticorrosive film on the inner surface of the steam pipe and the condensate pipe, and the pitting corrosion caused by the dissolved oxygen as described above and It is possible to effectively suppress wall-thinning corrosion due to carbon dioxide gas.

However, in the above-described steam boiler apparatus, the feed water supplied to the steam boiler is heated there to become steam, and a part of the feed water remains as boiler water in the steam boiler. The corrosion inhibitor that has also been distributed to the steam and the boiler water. Therefore, some of the corrosion inhibitors injected into the feedwater remain in the boiler water and do not contribute to the corrosion inhibition of steam piping and condensate piping. It is necessary to set the injection amount into the water supply excessively in consideration of the residual amount of water.

Further, since the corrosion inhibitor, particularly the film forming agent, injected into the feed water may form a film on the water level detector for controlling the water level in the steam boiler, the water level can be smoothly controlled. And the operation of the steam boiler may become unstable.

An object of the present invention is to use a corrosion inhibitor for suppressing corrosion of a steam pipe and a condensing pipe of a steam boiler without waste, and to operate the steam boiler stably.

[0008]

SUMMARY OF THE INVENTION A steam boiler apparatus according to the present invention includes a steam boiler that heats feed water to generate steam, a load device that uses steam generated by the steam boiler, and a steam boiler that generates steam by using steam generated by the steam boiler. A steam pipe for supplying to the load device, a condensate pipe for collecting condensate obtained by condensing steam used in the load device and mixing it with feed water, a steam pipe and a condensate pipe. An injection section for injecting a required amount of the corrosion inhibitor into one of the injection sections,
The required amount of the corrosion inhibitor is set so as to be adjustable according to the amount of steam generated in the steam boiler.

In this steam boiler, for example, a plurality of load devices are provided, and a steam pipe and a condensate pipe are separately provided for each of the plurality of load devices, and steam from the steam boiler is supplied to the plurality of load devices. A steam distribution unit for distributing the steam to each steam pipe is further provided. In this case, the injection section is set, for example, to be able to inject the corrosion inhibitor into the vapor distribution section.

[0010] A steam boiler apparatus according to another aspect of the present invention includes a plurality of steam boilers that generate steam by heating feed water, a load device that uses steam generated by the steam boiler,
A steam concentrator for collecting steam from a plurality of steam boilers, a steam pipe for supplying the steam collected in the steam concentrator to a load device, and steam used in the load device condensing. A condensing pipe for collecting the obtained condensate and mixing it with the feedwater, and an injection part for injecting a required amount of a corrosion inhibitor into one of a steam pipe and a condensate pipe, Is set so that the required amount of the corrosion inhibitor can be adjusted according to the total amount of steam generated in each of the plurality of steam boilers.

In this steam boiler device, for example, a plurality of load devices are provided, and a steam pipe and a condensate pipe are separately provided for each of the plurality of load devices. The steam is set such that it can be distributed to the steam pipes of a plurality of load devices. Further, the injection section is set, for example, so as to be able to inject the corrosion inhibitor into the steam concentration section.

In the method for operating a steam boiler apparatus according to the present invention, steam is generated by heating feed water with a steam boiler, and the steam generated by the steam boiler is supplied to a load device through a steam pipe, and is used in the load device. This is a method for operating a steam boiler apparatus in which condensate obtained by condensing steam is mixed with feedwater through a condensate pipe and reused. This operation method includes an injection step of injecting a corrosion inhibitor in an amount corresponding to the amount of steam generated in the steam boiler into one of the steam pipe and the condensing pipe.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A steam boiler according to an embodiment of the present invention will be described with reference to FIG. In the figure, a steam boiler device 1 includes:
Water supply device 2, steam boiler 3, load device 4, steam pipe 5,
It mainly includes a condensate pipe 6 and an injection device 7 (an example of an injection section).

The water supply device 2 is for supplying water to the steam boiler 3. The water supply passage 8, a water supply tank 9 for storing supply water from the water supply passage 8, and a water supply tank 9.
A water supply passage 10 for supplying the water stored in the steam boiler 3 is mainly provided. The water supply passage 10 is provided with a water supply tank 9.
A water supply pump 11 is provided for sending out water stored in the steam boiler 3.

The steam boiler 3 is for heating the supply water supplied from the water supply device 2 to generate steam, and includes a heating burner 12 for heating the supply water and an operation control device 1.
3 is provided. The operation control device 13 includes the steam boiler 3
For example, a three-position control system, more specifically, a heating burner 12
Can be set to one of three positions: stop, low combustion, and high combustion. Here, the amount of steam generated in the steam boiler 3 corresponds to the amount of combustion set by the operation control device 13. For example, assuming that the amount of steam generated by the steam boiler 3 is “10” when the combustion amount set by the operation control device 13 is “high combustion”, when the combustion amount is set to “low combustion” (Ie, “5”), and becomes “0” when set to “stop”.

In the steam boiler 3, a water level detector 1 is provided.
4 are arranged. The water level detector 14 is set to be able to transmit a water level signal to the feedwater pump 11.
On the basis of this water level signal, the water supply pump 14 is on-off controlled so that the water level in the steam boiler 3 is kept constant.

The load device 4 is, for example, a heat exchanger for performing required heat exchange using steam generated in the steam boiler 3. The steam pipe 5 extends from the steam boiler 3,
This is for supplying steam from the steam boiler 3 to the load device 4. The condensate pipe 6 extends from the load device 4 to the water supply tank 9, and condensed water (condensate) obtained by condensing steam used in the load device 4 is supplied to the water supply tank 9.
It is intended to be collected. The condensing pipe 6 has a steam trap 15.

The injection device 7 includes a chemical tank 16 for storing a corrosion inhibitor, and a chemical injection pipe 17 connecting the chemical tank 16 and the steam pipe 5. Chemical injection pipe 17
Has a chemical injection pump 18 for supplying the corrosion inhibitor in the chemical tank 16 into the steam pipe 5. The chemical injection pump 18 is connected to the operation control device 13, and has a steam pipe according to the above-described combustion amount set in the operation control device 13, that is, according to the amount of steam generated in the steam boiler 3. 5, the required amount of the corrosion inhibitor to be supplied is set to be adjustable. More specifically, the chemical injection pump 18 sets the amount of combustion set in the operation control device 13 to “high combustion” (that is, the amount of steam generated in the steam boiler 3 is, for example, the above “10”). Is a steam pipe 5
The required amount of the corrosion inhibitor to be supplied is set to, for example, a predetermined unit amount (hereinafter referred to as a unit amount). When the combustion amount set in the operation control device 13 is “low combustion” (that is, when the amount of steam generated in the steam boiler 3 is, for example, “5” described above), the steam is supplied to the steam pipe 5. The required amount of the corrosion inhibitor is set to half the unit amount (hereinafter, referred to as a half unit amount). Further, when the combustion amount set in the operation control device 13 is “stop” (that is, when the steam amount generated in the steam boiler 3 is “0”), the supply of the corrosion inhibitor to the steam pipe 5 is stopped. .

The corrosion inhibitors used here are various ones used to suppress the corrosion of the steam pipe 5 and the condensate pipe 6. As such a corrosion inhibitor, a neutralizing agent having an effect of neutralizing carbon dioxide contained in steam or condensate, and an effect of forming a corrosion-resistant film on the inner surface of the steam pipe 5 or the condensate pipe 6. A film forming agent and a complexing agent in which a neutralizing agent and a film forming agent are compounded can be exemplified.

The various members constituting the steam boiler device 1 described above, particularly, the steam pipe 5 and the condensate pipe 6 are mainly formed using steel pipes.

Next, the operation of the above steam boiler 1 will be described. When operating the steam boiler device 1, make-up water is supplied from the water injection channel 8 to the water supply tank 9, and the make-up water is stored in the water supply tank 9. Then, the water supply pump 11 is operated to supply the water stored in the water supply tank 9 to the water supply passage 10.
Through the steam boiler 3. The steam boiler 3 heats feed water by the heating burner 12 to generate steam.
The generated steam is supplied to the load device 4 through the steam pipe 5. The steam that has passed through the load device 4 loses latent heat and partly changes to condensed water, and the steam and water are separated in the steam trap 15 to become condensed water (drain water). This condensate is collected in the water supply tank 9 through the condensate pipe 6,
Then, the steam boiler 3
Reused for water supply to

During operation of the steam boiler device 1 as described above, the operation control device 13 transmits the combustion amount of the steam boiler 3 to the chemical injection pump 18. And the chemical injection pump 18
Operates on the basis of the combustion amount information transmitted from the operation control device 13, and supplies a required amount of the corrosion inhibitor corresponding to the combustion amount, that is, the amount of steam generated in the steam boiler 3 from the chemical tank 16 to the chemical injection pipe 17. Through the steam pipe 5. Specifically, the chemical injection pump 18 supplies a unit amount of the corrosion inhibitor when the combustion amount of the steam boiler 3 is “high combustion”, and when the combustion amount of the steam boiler 3 is “low combustion”. Supplies half a unit of corrosion inhibitor. Further, when the combustion amount of the steam boiler 3 is “stop”, the supply of the corrosion inhibitor is stopped.

The corrosion inhibitor supplied to the steam pipe 5 as described above is dispersed in the steam moving inside the steam pipe 5 toward the load device 4. The corrosion inhibitor dispersed in the steam exerts a corrosion inhibitory action on the steam pipe 5 and the condensate pipe 6 according to its effect.

As described above, since the steam boiler device 1 is set so as to supply the corrosion inhibitor into the steam pipe 5, the steam boiler device 1 may have the same effect as the conventional device that supplies the corrosion inhibitor to the water supply. It is possible to reduce waste of the corrosion inhibitor and problems of the water level detector 14. In particular, in the steam boiler device 1, the required amount of the corrosion inhibitor is supplied from the injection device 7 to the steam pipe 5 in accordance with the amount of steam generated in the steam boiler 3, so that the amount of the corrosion inhibitor used is more appropriate. , And economical operation becomes possible. In addition, as a result of setting the usage amount of the corrosion inhibitor appropriately in this way, the condensed water collected from the condensate piping 6 to the water supply tank 9 suppresses the residual corrosion inhibitor, so that the water supply tank 9 It is difficult to impair the quality of the supply water stored inside. Therefore, when the condensed water is supplied to the steam boiler 3, the water level detector 14 is less likely to malfunction.

In the steam boiler apparatus 1 described above, the corrosion inhibitor is set to be supplied into the steam pipe 5. However, the chemical injection pipe 17 is connected to the condensate pipe 6, and It may be set to supply a corrosion inhibitor. By doing so, mainly the corrosion of the condensate pipe 6 is effectively suppressed. Incidentally, in this case, it is preferable that the chemical injection pipe 17 be connected to the condensate pipe 6 immediately after the steam trap 15. In this case, since the corrosion inhibitor can be directly supplied to the condensate water, a less volatile corrosion inhibitor can be used.

Embodiment 2 Referring to FIG. 2, a modification of the steam boiler device 1 according to Embodiment 1 will be described. 2, parts corresponding to those in FIG. 1 are denoted by the same reference numerals. In the figure, the steam boiler device 1 includes two load devices 4a and 4b. Steam pipes 5a and 5b are individually connected to the load devices 4a and 4b. These steam pipes 5a and 5b are
It extends from a steam distributor (an example of a steam distributor) 21 connected to a steam supply pipe 20 from the steam boiler 3. The steam distributor 21 distributes steam supplied from the steam boiler 3 via the steam supply pipe 20 to the steam pipes 5a and 5b.

Each of the load devices 4a and 4b is individually provided with condensate piping 6a and 6b having a steam trap 15, respectively. The two condensate pipes 6a and 6b are unified and extend to the water supply tank 9. Further, the chemical injection pipe 17 of the injection device 7 communicates with the vapor distribution device 21.

In the steam boiler 1, steam generated in the steam boiler 3 is supplied to a steam distributor 21 through a steam supply pipe 20. The steam supplied to the steam distribution device 21 is distributed there to the steam pipes 5a and 5b, and is used by the load devices 4a and 4b. Load device 4a, 4b
The steam that has passed through the pipes loses latent heat while passing through the condensate pipes 6a and 6b, and partly changes into condensed water. In the steam trap 15, the steam and water are separated to become condensed water (drain water). . The condensed water in each of the condensate pipes 6a and 6b is collected in the water supply tank 9 after being merged, where it is mixed with makeup water from the water injection passage 8 and reused as water supply to the steam boiler 3.

During the operation of the steam boiler device 1 as described above, the chemical injection pump 18 of the injection device 7 operates according to the first embodiment.
In the same manner as in the above case, the operation is performed based on the combustion amount information transmitted from the operation control device 13, and the required amount of the corrosion inhibitor corresponding to the combustion amount, that is, the amount of steam generated in the steam boiler 3 is injected from the chemical tank 16. It is supplied into the steam distribution device 21 through the pipe 17. The corrosion inhibitor supplied into the steam distribution device 21 is dispersed in the steam distributed to the steam pipes 5a and 5b. Therefore, in this embodiment, a required amount of the corrosion inhibitor is injected into the steam pipes 5a and 5b via the steam distribution device 21. The corrosion inhibitor dispersed in the steam is supplied to the steam pipes 5a and 5b and the condensate pipes 6a and 6a.
It exerts a corrosion inhibiting action according to its effect on b.

As described above, the steam boiler device 1 is set so as to supply the corrosion inhibitor into the steam pipes 5a and 5b through the steam distribution device 21, so that the same effect as in the first embodiment is obtained. Can be demonstrated.

In the steam boiler apparatus 1 according to this embodiment, the steam pipe 5
Although the corrosion inhibitor is supplied to the insides a and 5b, the corrosion inhibitor may be supplied directly to each of the steam pipes 5a and 5b individually. In this case, the injection device 7 is individually arranged for each of the steam pipes 5a and 5b. Then, the required amount of the corrosion inhibitor corresponding to the amount of steam generated in the steam boiler 3 is distributed according to the distribution ratio of steam to the steam pipes 5a and 5b set in the steam distributor 21 while each steam pipe 5a is distributed. Of the injection pumps 18 of the respective injection devices 7 so as to supply the liquid to the injection pumps 5 and 5b. Therefore, in the case of this modification, the load device 4
A different corrosion inhibitor can be supplied to each of the steam pipes 5a and 5b in accordance with the types of a and b.

In this embodiment, the case where two load devices 4a and 4b are used has been described. However, the present invention can be similarly applied to a case where three or more load devices are used.

Embodiment 3 Referring to FIG. 3, a steam boiler according to another embodiment will be described. In the figure, a steam boiler device 30 includes a water supply device 2, three steam boilers 3a, 3b, 3c, a steam concentrator 31, a load device 4, a steam pipe 5, a condensate pipe 6, and an injection device 7 (an example of an injection unit). ).

The water supply device 2 comprises steam boilers 3a, 3b, 3
c for supplying water to the supply water, a water supply tank 9 for storing supply water from the water supply path 8, and water supplied to the water supply tank 9 to the steam boilers 3a, 3b.
It mainly has a water supply passage 10 for supplying b, 3c. The water supply channel 10 has three individual water supply channels 10a, 10b, 1 so as to individually correspond to the steam boilers 3a, 3b, 3c.
0c, each of the individual water supply channels 10a, 10b, 1
0c has a water supply pump 11 for sending out the water stored in the water supply tank 9 toward the corresponding steam boilers 3a, 3b, 3c.

Each of the steam boilers 3a, 3b and 3c is for heating the water supplied from the water supply device 2 to generate steam, and is provided with a heating burner 12 for heating the water supply.
And the operation control device 13 are separately provided. The operation control device 13 is for setting the amount of combustion in the corresponding steam boilers 3a, 3b, 3c. For example, a three-position control system, more specifically, the heating burner 12 is stopped, and the low combustion and high combustion It can be set to any of the three combustion positions. Here, each steam boiler 3a, 3b, 3c
Will correspond to the combustion amount set by the operation control device 13. For example, taking the steam boiler 3a as an example, assuming that the steam amount generated in the steam boiler 3a is "10" when the combustion amount set by the operation control device 13 is "high combustion", it is set to "low combustion". For example, it is の (ie, “5”) at the time of high combustion, and becomes “0” when “stop” is set. The same applies to the other steam boilers 3b and 3c.

In each of the steam boilers 3a, 3b and 3c, a water level detector 14 is individually arranged. This water level detector 14 is provided with corresponding individual water supply channels 10a, 10b, 1
The water level signal is set to be able to be transmitted to the water supply pump 11 of 0c, and the water supply pump 11 maintains the water level in the corresponding steam boilers 3a, 3b, 3c based on the water level signal. On-off control is performed.

The steam concentrator 31 includes each steam boiler 3a,
The steam supply pipes 32a, 32b, and 32c extend from the steam boilers 3a, 3b, and 3c, respectively.
The steam concentrator 31 has a pressure sensor 33 for measuring the pressure of the steam supplied and collected, and a number control device 34 connected to the pressure sensor 33. The number control device 34 individually sets the operation or stop of each of the steam boilers 3a, 3b, 3c according to the pressure measured by the pressure sensor 33, and thereby adjusts the amount of steam supplied to the steam concentrator 31. belongs to. In addition, the steam boilers 3a, 3
The activation order of b and 3c follows the preset order.

The load device 4 includes, for example, a steam boiler 3a,
This is a heat exchanger for performing necessary heat exchange using the steam generated in 3b and 3c. The steam pipe 5 is a steam concentrator 3
1 and the load boiler 3
a, 3b, and 3c for supplying steam. The condensate pipe 6 extends from the load device 4 to the water supply tank 9, and is for collecting condensed water (condensed water) obtained by condensing the steam used in the load device 4 into the water supply tank 9. . The condensate pipe 6 has a steam trap 15.

The injection device 7 includes a chemical tank 16 for storing the corrosion inhibitor, the chemical tank 16 and the vapor concentrator 3.
1 and a chemical injection pipe 17 for communicating with the fuel injection pipe 1. The chemical injection pipe 17 has a chemical injection pump 18 for supplying the corrosion inhibitor in the chemical tank 16 into the steam concentration device 31.
The chemical injection pump 18 is connected to the operation control devices 13 of the steam boilers 3a, 3b, 3c through the number control device 34, and the number of operating steam boilers 3a, 3b, 3c set by the number control device 34 and Operation control device 13
In accordance with the total amount of the above-mentioned combustion amounts for the respective steam boilers 3a, 3b, 3c set in the above, that is, according to the total amount of the steam generated in the respective steam boilers 3a, 3b, 3c. The required amount of the corrosion inhibitor to be supplied into the inside 31 is set to be adjustable. The corrosion inhibitor used here is the same as in the first embodiment.

The various members constituting the steam boiler 30 described above, in particular, the steam pipe 5 and the condensing pipe 6 are mainly formed using steel pipes.

Next, the operation of the steam boiler 30 will be described. When the steam boiler device 30 is operated, makeup water is supplied from the water injection channel 8 to the water supply tank 9, and the makeup water is stored in the water supply tank 9. Then, each water supply pump 11 is operated to supply the water stored in the water supply tank 9 to each steam boiler 3a, 3b, 3c through the water supply path 10 and the individual water supply paths 10a, 10b, 10c. Each of the steam boilers 3a, 3b, and 3c heats feed water by a heating burner 12 to generate steam. The generated steam is supplied to the steam concentrator 31 through the steam supply pipes 32a, 32b, and 32c.
Supplied to

Here, if the amount of steam supplied to the steam concentrator 31 is excessive or less than the required amount in the load device 4, the pressure sensor 33 detects this, and the number controller 34 causes the steam boiler 3a, 3b and 3c are set, and the operation control device 13 operates the steam boilers 3a and 3c.
Individual combustion amounts for b and 3c are set.

The steam supplied to the steam concentrator 31 is subsequently supplied to the load device 4 through the steam pipe 5. The steam that has passed through the load device 4 loses latent heat and partly changes to condensed water, and the steam and water are separated in the steam trap 15 to become condensed water (drain water). This condensed water is collected in a water supply tank 9 through a condensate pipe 6, where it is mixed with make-up water from a water injection passage 8 to form a steam boiler 3 a, 3 b,
Reused as water for 3c.

During the operation of the steam boiler device 30 as described above, the operation control device 13 of each of the steam boilers 3a, 3b, 3c individually sends the combustion amount of each of the steam boilers 3a, 3b, 3c to the number control device 34. introduce. Then, the number control device 34 determines the total amount of steam generated in each of the steam boilers 3a, 3b, 3c based on the combustion amount information transmitted from each operation control device 13, and determines the corrosion amount corresponding to the total amount. The required amount of inhibitor is transmitted to the dosing pump 18. Thereby, the chemical injection pump 18 supplies the required amount of the corrosion inhibitor from the chemical tank 16 to the inside of the vapor concentration device 31 through the chemical injection pipe 17. The required amount here is, for example, three times the unit amount described in the first embodiment when the combustion amounts of all the steam boilers 3a, 3b, and 3c are "high combustion". When the combustion amount of 3a, 3b, 3c is "low combustion", it becomes 1.5 times the unit amount.

The corrosion inhibitor supplied to the steam concentrator 31 as described above is supplied from the steam concentrator 31 to the steam pipe 5.
Disperse in the steam supplied to. The corrosion inhibitor dispersed in the steam exerts a corrosion inhibitory action on the steam pipe 5 and the condensate pipe 6 according to its effect.

As described above, this steam boiler device 30
Since the corrosion inhibitor is set to be supplied into the steam pipe 5 via the steam concentration device 31, the same effect as in the case of the first embodiment can be exerted.

In the steam boiler 30 according to this embodiment, the corrosion inhibitor is supplied into the steam pipe 5 through the steam concentrator 31 as described above. May be directly supplied to the inside, or may be supplied to the condensate pipe 6. In these cases,
It is necessary to connect the injection device 7 to the steam pipe 5 or the condensing pipe 6. Further, in this embodiment, a case where three steam boilers 3a, 3b, 3c are used has been described, but the same can be applied to a case where two or four or more steam boilers are used.

Fourth Embodiment A modification of the steam boiler device 30 according to the third embodiment will be described with reference to FIG. 4, parts corresponding to those in FIG. 3 are denoted by the same reference numerals. In the figure, the steam boiler device 30 includes two load devices 4a and 4b. Each of the load devices 4a, 4b has a steam pipe 5a, 5
b are individually connected. These steam pipes 5a, 5b
Extends from the steam concentrator 31. The steam concentrator 31 used here collects the steam generated in the steam boilers 3a, 3b, 3c through the steam supply pipes 32a, 32b, 32c and distributes the steam to the steam pipes 5a, 5b.

Each of the load devices 4a and 4b is individually provided with condensate piping 6a and 6b having a steam trap 15, respectively. The two condensate pipes 6a and 6b are unified and extend to the water supply tank 9.

In the steam boiler device 30, each steam boiler 3a, 3
The steam from b, 3c is then distributed to the steam pipes 5a, 5b and used by the load devices 4a, 4b. The steam that has passed through the load devices 4a and 4b loses latent heat and is partially converted into condensed water. In the steam trap 15, the steam and water are separated and condensed (drain water). Each condensate piping 6
The condensed water in a and 6b is merged and collected in the water supply tank 9, where it is mixed with makeup water from the water injection passage 8 and reused as water for the steam boilers 3a, 3b and 3c.

During the operation of the steam boiler device 30 as described above, the chemical injection pump 18 of the injection device 7 controls the total amount of steam generated in each of the steam boilers 3a, 3b, 3c as in the case of the third embodiment. A corresponding required amount of the corrosion inhibitor is supplied from the chemical tank 16 to the vapor concentrator 31 through the chemical injection pipe 17.
Supply within. The corrosion inhibitor supplied into the steam concentrator 31 is dispersed in the steam distributed from the steam concentrator 31 to the steam pipes 5a and 5b. The corrosion inhibitor dispersed in the steam exerts a corrosion inhibitory action on the steam pipes 5a and 5b and the condensate pipes 6a and 6b according to the effect.

As described above, the steam boiler device 30
Since the corrosion inhibitor is set to be supplied into the steam pipes 5a and 5b via the steam concentrator 31, the same effect as in the first embodiment can be exerted.

In the steam boiler 30 according to this embodiment, the corrosion inhibitor is supplied to the steam pipes 5a and 5b via the steam concentrator 31.
The corrosion inhibitor may be directly supplied directly to each of the steam pipes 5a and 5b. In this case, the injection device 7 is individually arranged for each of the steam pipes 5a and 5b. And steam boiler 3
The required amount of the corrosion inhibitor corresponding to the total amount of steam generated in the steam concentrators a, 3b and 3c is distributed according to the steam distribution ratio to the steam pipes 5a and 5b set in the steam concentrator 31. The chemical injection pump 18 of each injection device 7 is set to supply to the pipes 5a and 5b. Therefore, in the case of this modification, a different corrosion inhibitor can be supplied to each of the steam pipes 5a and 5b according to the type of the load devices 4a and 4b.

In this embodiment, the case where two load devices 4a and 4b are used has been described. However, the present invention can be similarly applied to a case where three or more load devices are used.

[0055]

In the steam boiler apparatus according to the present invention, a required amount of the corrosion inhibitor is injected into one of the steam pipe and the condensate pipe in accordance with the amount of steam generated in the steam boiler. The inhibitor can be used without waste and can be operated stably.

In the method for operating the steam boiler according to the present invention, the amount of the corrosion inhibitor corresponding to the amount of steam generated in the steam boiler is injected into one of the steam pipe and the condensate pipe. In addition, the corrosion inhibitor can be used without waste, and the steam boiler can be operated stably.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a steam boiler device according to Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram of a steam boiler device according to Embodiment 2 of the present invention.

FIG. 3 is a schematic diagram of a steam boiler device according to Embodiment 3 of the present invention.

FIG. 4 is a schematic diagram of a steam boiler device according to Embodiment 4 of the present invention.

[Explanation of symbols]

 1,30 Steam boiler device 3,3a, 3b, 3c Steam boiler 4,4a, 4b Load device 5,5a, 5b Steam pipe 6,6a, 6b Condenser pipe 7 Injection device 21 Steam distribution device 31 Steam concentration device

Claims (7)

[Claims] 1. A steam boiler that generates steam by heating feed water, a load device that uses the steam, a steam pipe that supplies the steam to the load device, and a steam pipe that is used in the load device. A condensate pipe for collecting and mixing condensate obtained by condensation of the steam with the feedwater, and injecting a required amount of a corrosion inhibitor into one of the steam pipe and the condensate pipe. A steam boiler apparatus, comprising: an injection unit for adjusting the required amount according to the amount of steam generated in the steam boiler. 2. The apparatus according to claim 2, wherein a plurality of said load devices are provided, and said steam pipe and said condensate pipe are separately provided for each of said plurality of load devices, and said steam from said steam boiler is supplied to said plurality of load devices. The steam boiler device according to claim 1, further comprising a steam distribution unit for distributing the steam to the steam pipe for each device. 3. The steam boiler apparatus according to claim 2, wherein the injection section is set so that the corrosion inhibitor can be injected into the steam distribution section. 4. A plurality of steam boilers for generating steam by heating feed water, a load device using the steam, a steam concentrator for collecting the steam from the plurality of steam boilers, A steam pipe for supplying the steam collected in a steam concentrator to the load device; and collecting and collecting condensed water obtained by condensing the steam used in the load device with the feedwater. A condensing pipe for injecting a required amount of a corrosion inhibitor into one of the steam pipe and the condensing pipe, and the injecting section includes a plurality of steam boilers. The steam boiler device, wherein the necessary amount is set to be adjustable according to the total amount of the generated steam. 5. The apparatus according to claim 1, wherein a plurality of said load devices are provided, and said steam pipe and said condensate pipe are individually provided for each of said plurality of load devices. The steam boiler device according to claim 4, wherein the steam boiler device is set to be distributable to the steam pipe for each device. 6. The steam boiler apparatus according to claim 4, wherein the injection section is set so that the corrosion inhibitor can be injected into the steam concentration section. 7. A feed water is heated by a steam boiler to generate steam, the steam is supplied to a load device through a steam pipe, and condensate obtained by condensing the steam used in the load device is condensed. A method of operating a steam boiler apparatus that mixes and reuses the feedwater through a pipe, wherein an amount of a corrosion inhibitor according to an amount of steam generated in the steam boiler is one of the steam pipe and the condensate pipe. A method for operating a steam boiler device, including a pouring step of pouring into a steam boiler.