JP2000205509A - Boiler capable of reducing injected quantity of water treating chemical - Google Patents
Boiler capable of reducing injected quantity of water treating chemicalInfo
- Publication number
- JP2000205509A JP2000205509A JP11003826A JP382699A JP2000205509A JP 2000205509 A JP2000205509 A JP 2000205509A JP 11003826 A JP11003826 A JP 11003826A JP 382699 A JP382699 A JP 382699A JP 2000205509 A JP2000205509 A JP 2000205509A
- Authority
- JP
- Japan
- Prior art keywords
- water
- steam
- boiler
- deaerator
- separator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Physical Water Treatments (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、多管式貫流ボイラ
等のボイラにおいて、スケール防止、腐食防止のための
水処理薬品の注入を不要又は大幅に低減し、無薬注運転
又は無薬注運転に近い運転が可能となるボイラに関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler such as a multi-tube once-through boiler, in which the injection of water treatment chemicals for scale prevention and corrosion prevention is unnecessary or greatly reduced, and chemical-free operation or chemical-free injection is performed. The present invention relates to a boiler that enables operation close to operation.
【0002】[0002]
【従来の技術】ボイラにおける給水に際しては、水管等
のスケール防止、腐食防止のために水処理薬品の注入
(薬注)が必要であった。また、ボイラに設けられた気
水分離器に給水を脱気する機能を持たせて、給水の溶存
酸素濃度を低減させ、水管等の腐食を軽減することも行
われているが、気水分離器による脱気のみでは、給水中
の溶存酸素濃度が、腐食を発生しない許容値である0.
5ppmを超えてしまうことがある。そして、この場合
も、スケール防止のために水処理薬品の注入が必要であ
る。スケールの原因は、給水に含まれるカルシウムやシ
リカ等の無機塩類の固体化にあり、薬品の注入により給
水の水質(pH、溶存酸素など)を管理することが必要と
なる。上記のように、気水分離器による脱気のみでは、
給水中の溶存酸素濃度が、腐食を発生しない許容値であ
る0.5ppmを超えてしまうことがあった。そこで、給
水を脱気して溶存酸素濃度を低減させるための脱気器を
用いる技術があるが、従来は、脱気器がボイラとは別の
装置として設置されるものであった。2. Description of the Related Art When supplying water to a boiler, it has been necessary to inject a water treatment chemical (chemical injection) in order to prevent scale and corrosion of water pipes and the like. In addition, the steam-water separator provided in the boiler is provided with a function to deaerate the feedwater, reducing the dissolved oxygen concentration of the feedwater and reducing the corrosion of water pipes, etc. The concentration of dissolved oxygen in the feed water is an allowable value that does not cause corrosion by only degassing with a gasifier.
May exceed 5 ppm. Also in this case, it is necessary to inject a water treatment chemical to prevent scale. The scale is caused by solidification of inorganic salts such as calcium and silica contained in the water supply, and it is necessary to control the water quality (pH, dissolved oxygen, etc.) of the water supply by injecting a chemical. As described above, only degassing with the steam separator
The dissolved oxygen concentration in the feedwater sometimes exceeded the allowable value of 0.5 ppm at which no corrosion occurred. Therefore, there is a technique using a deaerator for reducing the concentration of dissolved oxygen by deaeration of the feedwater. However, conventionally, the deaerator has been installed as a separate device from the boiler.
【0003】脱気器をボイラに適用する従来の技術とし
ては、一例として、図2に示すような装置が知られてい
る。すなわち、ボイラ10とは別の装置として設置され
た脱気器12に給水(予め軟化器を通して軟水としてい
る。)が供給され、脱気器12で給水が脱気されて、脱
気された酸素は脱気器12上部のベンド管14から系外
に排出され、脱気され溶存酸素濃度が低減した給水はポ
ンプ16により脱気器12下部から抜き出される。18
は調節弁である。脱気器12には蒸気だめ20の蒸気管
22から取り出される蒸気の一部が分岐蒸気管24を介
して供給され、この蒸気により給水が脱気される。26
は調節弁である。ポンプ16により抜き出された給水
は、給水配管28を通って給水ポンプ30により気水分
離器32に導入される。気水分離器32に流入した給水
は、ボイラ本体34からの気水混合物から分離された飽
和水とともに、戻り管36を通ってボイラ本体34に導
入される。ボイラ本体34からの気水混合物は、循環配
管38を通って気水分離器32に循環され、負荷に供さ
れる主蒸気が主蒸気管40から取り出されて蒸気だめ2
0に送られ、分離された飽和水は給水された水とともに
戻り管36を通ってボイラ本体34に循環される。42
は調節弁である。As a conventional technique for applying a deaerator to a boiler, for example, an apparatus as shown in FIG. 2 is known. That is, water (supplied through a softener beforehand) is supplied to a deaerator 12 installed as a device separate from the boiler 10, and the supply water is degassed by the deaerator 12, and the deaerated oxygen is supplied. Is discharged out of the system through a bend pipe 14 at the upper part of the deaerator 12, and the supply water, which has been deaerated and has a reduced dissolved oxygen concentration, is extracted from the lower part of the deaerator 12 by a pump 16. 18
Is a control valve. Part of the steam extracted from the steam pipe 22 of the steam sump 20 is supplied to the deaerator 12 through a branch steam pipe 24, and the feed water is degassed by the steam. 26
Is a control valve. The feedwater extracted by the pump 16 passes through a feedwater pipe 28 and is introduced into a steam separator 32 by a feedwater pump 30. The feedwater flowing into the steam separator 32 is introduced into the boiler body 34 through the return pipe 36 together with the saturated water separated from the steam-water mixture from the boiler body 34. The steam-water mixture from the boiler main body 34 is circulated through the circulation pipe 38 to the steam-water separator 32, and the main steam supplied to the load is taken out from the main steam pipe 40, and the steam sump 2
The saturated water separated and sent to the boiler body 34 is returned to the boiler body 34 through the return pipe 36 together with the supplied water. 42
Is a control valve.
【0004】[0004]
【発明が解決しようとする課題】薬注ポンプ等を用いて
給水配管に水処理薬品を注入する場合、例えば、取り扱
いにボイラ技士免許の要らない小型の多管式貫流ボイラ
等でも、運転中に水処理薬品がなくなったら、ボイラの
管理者などがいなければ、水処理薬品の注入が行えなか
った。このように、薬注運転を行うためには、取り扱い
に免許が不要なボイラであっても、ボイラ技士等を全く
不在とするわけにはいかなかった。また、気水分離器に
給水を脱気する機能を持たせ、気水分離器による給水脱
気のみを行う場合は、給水中の溶存酸素濃度が、腐食を
発生しない許容値である0.5ppmを超えてしまうおそ
れがあるだけでなく、脱気された酸素が主蒸気管に混入
するという問題がある。また、図2に示すような従来の
技術は、脱気器がボイラとは別の装置として設置される
ものであり、ボイラに脱気器を一体に組み込んだ構成で
はなく、ボイラに給水する給水ポンプの他に脱気器から
給水を抜き出すポンプが必要になり、また、脱気器での
脱気に使用される蒸気を蒸気だめから導入する構成とな
り、構成が大がかりで複雑になるという問題がある。When a water treatment chemical is injected into a water supply pipe by using a chemical injection pump or the like, for example, even a small multi-tube once-through boiler or the like that does not require a boiler engineer's license for handling is used during operation. When the water treatment chemicals were exhausted, the water treatment chemicals could not be injected without the boiler manager. As described above, in order to perform the chemical injection operation, even a boiler that does not require a license for handling could not completely eliminate a boiler engineer or the like. In addition, when the steam-water separator has a function of degassing the feedwater, and when only the feedwater deaeration is performed by the steam-water separator, the dissolved oxygen concentration in the feedwater is an allowable value of 0.5 ppm which does not cause corrosion. In addition, there is a problem that oxygen that has been degassed enters the main steam pipe. Further, in the conventional technology as shown in FIG. 2, the deaerator is installed as a separate device from the boiler, and the water supply for supplying water to the boiler is not a configuration in which the deaerator is integrated into the boiler. In addition to the pump, a pump that draws water from the deaerator is required, and the steam used for deaeration in the deaerator is introduced from the steam reservoir, and the configuration is large and complicated. is there.
【0005】本発明は上記の諸点に鑑みなされたもの
で、本発明の目的は、多管式貫流ボイラ等のボイラにお
いて、ボイラに脱気器を一体として組み込むことによ
り、スケール防止、腐食防止のための水処理薬品の注入
が不要又は大幅に低減され、無薬注運転又は無薬注運転
に近い運転が実現できるボイラを提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a boiler such as a multi-tube once-through boiler by incorporating a deaerator in the boiler to prevent scale and corrosion. It is an object of the present invention to provide a boiler that does not require or greatly reduces the injection of water treatment chemicals, and can realize a chemical-free operation or an operation close to a chemical-free operation.
【0006】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の水処理薬品の注入量を低減させることが
できるボイラは、脱気された給水をボイラ本体に供給
し、ボイラ本体からの気水混合物を気水分離器に導入
し、気水分離器から主蒸気を取り出すとともに、分離さ
れた水を給水とともにボイラ本体に循環するようにした
ボイラにおいて、ボイラに脱気器が一体として組み込ま
れ、脱気器に流入した未脱気の給水が、気水分離器から
の主蒸気の一部により脱気されるように、気水分離器か
らの主蒸気管と脱気器とが分岐蒸気管を介して接続さ
れ、脱気され溶存酸素濃度が低減された給水が、気水分
離器からの循環水とともにボイラ本体に供給されるよう
に、脱気器の底部とボイラ本体とが脱気給水管を介して
接続されるように構成されている(図1参照)。In order to achieve the above object, a boiler according to the present invention capable of reducing the injection amount of a water treatment chemical is provided by supplying degasified water to a boiler main body. The steam-water mixture is introduced into the steam-water separator, the main steam is extracted from the steam-water separator, and the separated water is circulated to the boiler body together with the water supply. And the main steam pipe from the steam separator and the deaerator so that the undegasified feedwater flowing into the degasser is degassed by a part of the main steam from the steam separator. Are connected via a branch steam pipe, and the bottom of the deaerator and the boiler body are connected so that the feedwater, which is degassed and the dissolved oxygen concentration is reduced, is supplied to the boiler body together with the circulating water from the steam separator. Are configured to be connected through a degassing water pipe And are (see Figure 1).
【0007】上記の本発明のボイラにおいて、脱気器に
流入した給水が脱気され、脱気器内の水頭(ヘッド)で
ボイラ本体に流入するような位置に、脱気器を設けるこ
とが好ましい(図1参照)。また、上記の本発明のボイ
ラにおいて、脱気された酸素が脱気器から系外に排出さ
れるように、脱気器の上部にベンド管を設けることが好
ましい(図1参照)。In the boiler of the present invention, the deaerator is provided at a position where the feedwater flowing into the deaerator is deaerated and flows into the boiler main body at the head in the deaerator. Preferred (see FIG. 1). Further, in the boiler of the present invention described above, it is preferable to provide a bend pipe above the deaerator so that the deaerated oxygen is discharged out of the system from the deaerator (see FIG. 1).
【0008】[0008]
【発明の実施の形態】以下、ボイラが多管式貫流ボイラ
である場合について、本発明の実施の形態を詳細に説明
するが、本発明は下記の実施の形態に何ら限定されるも
のではなく、適宜変更して実施することができるもので
ある。図1は、本発明の実施の形態による水処理薬品の
注入量を低減させることができるボイラの概略を示して
いる。図1に示すように、ボイラ44において、給水ポ
ンプ46により給水配管48に給水が行われる。この給
水は、軟化器を通して予め軟化されている。給水配管4
8はボイラ44に一体として組み込まれた脱気器50の
蒸気部52と接続されており、給水配管48から脱気器
50の蒸気部52に給水され、脱気器50で給水が脱気
されて、脱気された酸素は脱気器50上部のベンド管5
4から系外に排出される。56は調節弁である。脱気器
50には気水分離器58の主蒸気管60から取り出され
る主蒸気の一部が分岐蒸気管62を介して供給され、こ
の蒸気により蒸気部52に流入する給水が充分に脱気さ
れる。これにより、給水中の溶存酸素濃度が0.5ppm
以下となり、水管74や気水分離器58等の腐食が防止
される。また、気水分離器で脱気する場合のように、脱
気された酸素が主蒸気管60に混入することはない。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail for a case where the boiler is a multi-tube once-through boiler, but the present invention is not limited to the following embodiments. , Can be appropriately changed and implemented. FIG. 1 schematically shows a boiler capable of reducing an injection amount of a water treatment chemical according to an embodiment of the present invention. As shown in FIG. 1, in the boiler 44, water is supplied to a water supply pipe 48 by a water supply pump 46. This water supply is softened in advance through a softener. Water supply pipe 4
Numeral 8 is connected to the steam section 52 of the deaerator 50 integrated with the boiler 44, and water is supplied from the water supply pipe 48 to the steam section 52 of the deaerator 50, and the water is deaerated by the deaerator 50. The deaerated oxygen is supplied to the bend pipe 5 above the deaerator 50.
From 4 is discharged out of the system. 56 is a control valve. A part of the main steam extracted from the main steam pipe 60 of the steam separator 58 is supplied to the deaerator 50 through a branch steam pipe 62, and the feed water flowing into the steam section 52 is sufficiently deaerated by the steam. Is done. As a result, the dissolved oxygen concentration in the feed water is 0.5 ppm
Thus, the corrosion of the water pipe 74, the steam separator 58 and the like is prevented. Further, unlike the case of deaeration by the steam separator, the deaerated oxygen does not enter the main steam pipe 60.
【0009】脱気され溶存酸素濃度が低減した給水は、
脱気給水管64を通って、気水分離器58下部の戻り管
66を介して循環される気水混合物から分離された飽和
水とともに、ボイラ本体68の下部ヘッダー70に導入
される。この場合、脱気器50で脱気された給水は、脱
気器50内のヘッド(水頭)でボイラ本体68に流入す
るようになっている。下部ヘッダー70に導入された給
水は、燃焼室72の水冷壁を構成する水管74群の中を
流れ、上部ヘッダー76から気水混合物として取り出さ
れる。上部ヘッダー76からの気水混合物は、循環配管
78を通って気水分離器58に循環され、主蒸気管60
から負荷に供される主蒸気が取り出され、分離された飽
和水は脱気器50で脱気された給水とともにボイラ本体
68に循環される。主蒸気管60から取り出された主蒸
気は蒸気だめ(図示略)へ送られるが、その一部は、前
述のように、分岐蒸気管62を介して脱気器50に供給
される。80は調節弁である。なお、本実施形態では、
ボイラ缶水の濃縮を抑制してスケールトラブルを防止す
るための缶水をブローする構成等は、図示及び説明を省
略している。[0009] The feedwater degassed and the dissolved oxygen concentration is reduced,
The saturated water separated from the steam-water mixture circulated through the return pipe 66 below the steam separator 58 through the degassing water supply pipe 64 is introduced into the lower header 70 of the boiler main body 68. In this case, the supply water degassed by the deaerator 50 flows into the boiler main body 68 at a head (water head) inside the deaerator 50. The feedwater introduced into the lower header 70 flows through a group of water tubes 74 constituting a water cooling wall of the combustion chamber 72, and is taken out from the upper header 76 as a gas-water mixture. The steam mixture from the upper header 76 is circulated to the steam separator 58 through the circulation pipe 78 and the main steam pipe 60
The main steam supplied to the load is taken out from the tank, and the separated saturated water is circulated to the boiler main body 68 together with the supply water deaerated by the deaerator 50. The main steam extracted from the main steam pipe 60 is sent to a steam sump (not shown), and a part of the main steam is supplied to the deaerator 50 via the branch steam pipe 62 as described above. 80 is a control valve. In the present embodiment,
The illustration and description of the configuration and the like for blowing the boiler water for suppressing concentration of the boiler boiler water and preventing scale trouble are omitted.
【0010】[0010]
【発明の効果】本発明は上記のように構成されているの
で、つぎのような効果を奏する。 (1) ボイラに脱気器を組み込んでいるので、一体型
とすることができ、かつ、スケール防止、腐食防止のた
めの水処理薬品の注入が不要又は大幅に低減され、無薬
注運転又は無薬注運転に近い運転が可能になるボイラが
実現できる。 (2) ボイラに脱気器を組み込んだ一体型とすること
により、脱気器で脱気された給水をヘッド(水頭)でボ
イラ本体に流入することが可能となり、脱気器が別装置
である場合に必要となる給水抜出用のポンプが不要にな
り、また、脱気器での脱気に使用される蒸気を気水分離
器で取り出される主蒸気から供給できるので、構成が簡
単、かつ、コンパクトになる。 (3) ボイラに脱気器を一体として組み込んでいるの
で、気水分離器で脱気する場合のように、脱気された酸
素が主蒸気ライン(主蒸気管)に混入することはない。
例えば、脱気器の上部にベンド管を設ける構成では、脱
気された酸素は脱気器のベンド管から系外に排出され、
酸素が主蒸気ライン(主蒸気管)に混入することはな
い。As described above, the present invention has the following effects. (1) Since the deaerator is incorporated in the boiler, it can be integrated, and the injection of water treatment chemicals for scale prevention and corrosion prevention is unnecessary or greatly reduced. It is possible to realize a boiler that can perform operation close to non-chemical injection operation. (2) By integrating the boiler with a deaerator, the water degassed by the deaerator can flow into the boiler body with a head (water head). In some cases, a pump for water supply extraction required in some cases is not required, and the steam used for deaeration in the deaerator can be supplied from the main steam extracted in the steam separator, so the configuration is simple, And it becomes compact. (3) Since the deaerator is integrated into the boiler, the degassed oxygen does not enter the main steam line (main steam pipe) as in the case of deaeration by the steam separator.
For example, in a configuration in which a bend pipe is provided above the deaerator, the degassed oxygen is discharged out of the system from the bend pipe of the deaerator,
Oxygen does not enter the main steam line (main steam pipe).
【図1】本発明の実施の形態による水処理薬品の注入量
を低減させることができるボイラを示す概略構成図であ
る。FIG. 1 is a schematic configuration diagram showing a boiler capable of reducing an injection amount of a water treatment chemical according to an embodiment of the present invention.
【図2】脱気器をボイラに適用した従来の技術を示す概
略構成図である。FIG. 2 is a schematic configuration diagram showing a conventional technique in which a deaerator is applied to a boiler.
10、44 ボイラ 12、50 脱気器 14、54 ベンド管 16 ポンプ 18、26、42、56、80 調節弁 20 蒸気だめ 22 蒸気管 24、62 分岐蒸気管 28、48 給水配管 30、46 給水ポンプ 32、58 気水分離器 34、68 ボイラ本体 36、66 戻り管 38、78 循環配管 40、60 主蒸気管 52 蒸気部 64 脱気給水管 70 下部ヘッダー 72 燃焼室 74 水管 76 上部ヘッダー 10, 44 Boiler 12, 50 Deaerator 14, 54 Bend pipe 16 Pump 18, 26, 42, 56, 80 Control valve 20 Steam reservoir 22 Steam pipe 24, 62 Branch steam pipe 28, 48 Water supply pipe 30, 46 Water supply pump 32,58 Steam separator 34,68 Boiler body 36,66 Return pipe 38,78 Circulation pipe 40,60 Main steam pipe 52 Steam section 64 Degassing water pipe 70 Lower header 72 Combustion chamber 74 Water pipe 76 Upper header
Claims (3)
ボイラ本体からの気水混合物を気水分離器に導入し、気
水分離器から主蒸気を取り出すとともに、分離された水
を給水とともにボイラ本体に循環するようにしたボイラ
において、ボイラに脱気器が一体として組み込まれ、脱
気器に流入した未脱気の給水が、気水分離器からの主蒸
気の一部により脱気されるように、気水分離器からの主
蒸気管と脱気器とが分岐蒸気管を介して接続され、脱気
され溶存酸素濃度が低減された給水が、気水分離器から
の循環水とともにボイラ本体に供給されるように、脱気
器の底部とボイラ本体とが脱気給水管を介して接続され
たことを特徴とする水処理薬品の注入量を低減させるこ
とができるボイラ。1. The deaerated water supply is supplied to a boiler body,
In the boiler, the steam-water mixture from the boiler body is introduced into the steam-water separator, the main steam is extracted from the steam-water separator, and the separated water is circulated to the boiler body together with the water supply. The main steam pipe from the steam separator is connected to the main steam pipe from the steam separator so that the non-degassed feedwater flowing into the degasser is degassed by a part of the main steam from the steam separator. The deaerator and the boiler are connected to each other via a branch steam pipe so that the deaerated water with reduced dissolved oxygen concentration is supplied to the boiler body together with the circulating water from the steam separator. A boiler capable of reducing an injection amount of a water treatment chemical, wherein the boiler is connected to a main body via a deaerated water supply pipe.
器内の水頭でボイラ本体に流入するような位置に、脱気
器を設けた請求項1記載の水処理薬品の注入量を低減さ
せることができるボイラ。2. The water treatment chemical injection according to claim 1, wherein a deaerator is provided at a position where the feedwater flowing into the deaerator is deaerated and flows into the boiler body at a head in the deaerator. Boiler that can reduce the amount.
されるように、脱気器の上部にベンド管を設けた請求項
1又は2記載の水処理薬品の注入量を低減させることが
できるボイラ。3. The injection amount of the water treatment chemical according to claim 1 or 2, wherein a bend pipe is provided at an upper portion of the deaerator so that the deaerated oxygen is discharged out of the system from the deaerator. A boiler that can be made.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11003826A JP2000205509A (en) | 1999-01-11 | 1999-01-11 | Boiler capable of reducing injected quantity of water treating chemical |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11003826A JP2000205509A (en) | 1999-01-11 | 1999-01-11 | Boiler capable of reducing injected quantity of water treating chemical |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000205509A true JP2000205509A (en) | 2000-07-25 |
Family
ID=11568014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11003826A Pending JP2000205509A (en) | 1999-01-11 | 1999-01-11 | Boiler capable of reducing injected quantity of water treating chemical |
Country Status (1)
Country | Link |
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JP (1) | JP2000205509A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104421927A (en) * | 2013-08-27 | 2015-03-18 | 山西省霍州市化学工业有限责任公司 | Condensed water recycling device |
CN107489995A (en) * | 2017-07-12 | 2017-12-19 | 湘潭大学 | A kind of electrical heating pure steam generator |
JP2019020086A (en) * | 2017-07-20 | 2019-02-07 | 三井E&S環境エンジニアリング株式会社 | Operating method of once-through boiler in refuse incinerator and power-generating system using the same |
-
1999
- 1999-01-11 JP JP11003826A patent/JP2000205509A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104421927A (en) * | 2013-08-27 | 2015-03-18 | 山西省霍州市化学工业有限责任公司 | Condensed water recycling device |
CN107489995A (en) * | 2017-07-12 | 2017-12-19 | 湘潭大学 | A kind of electrical heating pure steam generator |
JP2019020086A (en) * | 2017-07-20 | 2019-02-07 | 三井E&S環境エンジニアリング株式会社 | Operating method of once-through boiler in refuse incinerator and power-generating system using the same |
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