JPH08303718A - Circulating fluidized bed boiler - Google Patents
Circulating fluidized bed boilerInfo
- Publication number
- JPH08303718A JPH08303718A JP11175895A JP11175895A JPH08303718A JP H08303718 A JPH08303718 A JP H08303718A JP 11175895 A JP11175895 A JP 11175895A JP 11175895 A JP11175895 A JP 11175895A JP H08303718 A JPH08303718 A JP H08303718A
- Authority
- JP
- Japan
- Prior art keywords
- fluidized bed
- combustion chamber
- steam
- bed heat
- heat exchange
- 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.)
- Withdrawn
Links
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は循環流動層ボイラに関す
るものである。BACKGROUND OF THE INVENTION The present invention relates to a circulating fluidized bed boiler.
【０００２】[0002]
【従来の技術】図４は従来の循環流動層ボイラの系統図
である。図において、流動用空気は、ブロワ９により流
動層熱交換部７を経て火炉１へ送られ、燃料と共に燃焼
を行う。燃焼ガスと燃焼粒子は、サイクロン２に送ら
れ、ガス分は後部煙道３と後部煙道３内に設けられた中
・低温蒸気過熱器１０を経て煙突へと送られる。2. Description of the Related Art FIG. 4 is a system diagram of a conventional circulating fluidized bed boiler. In the figure, the flow air is sent to the furnace 1 by the blower 9 through the fluidized bed heat exchange section 7 and burns together with the fuel. The combustion gas and the combustion particles are sent to the cyclone 2, and the gas component is sent to the chimney via the rear flue 3 and the medium / low temperature steam superheater 10 provided in the rear flue 3.
【０００３】サイクロン２により補集分離された粒子
は、シールポット５を経て再び火炉１の燃焼室に戻る
が、一部の粒子は灰取り出し調整弁４を経て流動層熱交
換部７に入り、ここで蒸気過熱器６により冷却された
後、再び火炉１の燃焼室へ戻る。The particles collected and separated by the cyclone 2 return to the combustion chamber of the furnace 1 again through the seal pot 5, but some of the particles enter the fluidized bed heat exchange section 7 through the ash extraction adjusting valve 4. Here, after being cooled by the steam superheater 6, it returns to the combustion chamber of the furnace 1 again.
【０００４】[0004]
【発明が解決しようとする課題】従来の循環流動層ボイ
ラにおいては、塩化ビニル、廃プラスチック等の塩素を
多量に含む燃料を使うことも多いが、このような場合、
炉内脱塩を行っても、図４における後部煙道３の燃焼ガ
ス中の残存塩化水素ガスにより、伝熱管の腐食を起すた
め、後部煙道３には高温蒸気過熱器が設置できず、中・
低温蒸気過熱器１０を設けるにとどめ、高温蒸気過熱器
は塩化水素ガスの存在が少ない流動層熱交換部７に設置
している。In the conventional circulating fluidized bed boiler, a fuel containing a large amount of chlorine such as vinyl chloride and waste plastic is often used, but in such a case,
Even if the inside of the furnace is desalted, the residual hydrogen chloride gas in the combustion gas of the rear flue 3 in FIG. During·
Only the low temperature steam superheater 10 is provided, and the high temperature steam superheater is installed in the fluidized bed heat exchange section 7 in which hydrogen chloride gas is less present.
【０００５】この場合、部分負荷時に火炉１内の燃焼室
の温度を定格値に維持するため、流動層熱交換部７を経
由して燃焼室へ戻る冷却された粒子の量を低減させる
か、あるいはゼロとする必要がある。この時、流動層熱
交換部７における交換熱量も低下するため、流動層熱交
換部７内の蒸気過熱器６の出口蒸気温度が定格値より下
がるという問題があった。In this case, in order to maintain the temperature of the combustion chamber in the furnace 1 at the rated value during partial load, the amount of cooled particles returning to the combustion chamber via the fluidized bed heat exchange section 7 is reduced, or Or it should be zero. At this time, since the amount of heat exchanged in the fluidized bed heat exchange section 7 is also reduced, there is a problem that the outlet steam temperature of the steam superheater 6 in the fluidized bed heat exchange section 7 becomes lower than the rated value.
【０００６】また、流動層熱交換部７から火炉１の燃焼
室へ戻る粒子の温度が低下すると、燃焼室温度を定格値
に維持できなくなるため、流動層熱交換部７の交換熱量
すなわち過熱度が制約されるという問題があった。Further, when the temperature of the particles returning from the fluidized bed heat exchange section 7 to the combustion chamber of the furnace 1 decreases, the combustion chamber temperature cannot be maintained at the rated value, so the amount of heat exchanged in the fluidized bed heat exchange section 7, that is, the degree of superheat. There was a problem that was restricted.
【０００７】本発明は、上記従来の技術の欠点を解消
し、流動層熱交換部における熱交換量の制約をなくし、
燃焼室温度を定格値に維持できるようにするものであ
る。The present invention solves the above-mentioned drawbacks of the prior art, eliminates the restriction of the amount of heat exchange in the fluidized bed heat exchange section,
It is intended to maintain the combustion chamber temperature at the rated value.
【０００８】[0008]
【課題を解決するための手段】本発明は、上記課題を解
決したものであって、燃焼室を出て循環する粒子を冷却
する流動層熱交換部を備えた循環流動層ボイラにおい
て、上記流動層熱交換部の粒子に熱を与える加熱手段を
設けたことを特徴とする循環流動層ボイラに関するもの
である。DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems and provides a circulating fluidized bed boiler provided with a fluidized bed heat exchange section for cooling particles circulating from a combustion chamber. The present invention relates to a circulating fluidized bed boiler, characterized in that a heating means for applying heat to particles in a bed heat exchange section is provided.
【０００９】[0009]
（１）流動層熱交換部の粒子に熱を与えることにより、
熱交換量の制約がなくなり、流動層熱交換部から燃焼室
へ戻る粒子の温度を調節して燃焼室温度を定格値に維持
できる。これにより、広範囲の負荷において流動層熱交
換による蒸気過熱器の出口蒸気温度を定格値に維持でき
る。(1) By applying heat to the particles in the fluidized bed heat exchange section,
There is no restriction on the amount of heat exchange, and the temperature of the particles returning from the fluidized bed heat exchange section to the combustion chamber can be adjusted to maintain the combustion chamber temperature at the rated value. As a result, the outlet steam temperature of the steam superheater due to fluidized bed heat exchange can be maintained at the rated value in a wide range of loads.
【００１０】（２）蒸気の過熱を流動層熱交換部のみで
行う場合にも、流動層熱交換部の粒子に熱を与えること
により、燃焼室の温度を定格値に維持しつつ、必要な蒸
気過熱が達成される。(2) Even when the superheat of the steam is carried out only in the fluidized bed heat exchange section, heat is applied to the particles in the fluidized bed heat exchange section to maintain the temperature of the combustion chamber at the rated value, which is necessary. Steam superheat is achieved.
【００１１】[0011]
【実施例】図１は、本発明の第１実施例を示す。本実施
例では、図４の従来例にみられる流動用空気ブロワ９の
出口にダクトバーナ８を設けたものであり、図１におい
て図４におけると同一の部分には同一の符号を付し、そ
の説明を省略する。FIG. 1 shows a first embodiment of the present invention. In this embodiment, the duct burner 8 is provided at the outlet of the flow air blower 9 shown in the conventional example of FIG. 4, and the same parts as those in FIG. 4 are designated by the same reference numerals in FIG. The description is omitted.
【００１２】本実施例においては、火炉１の燃焼室を飛
び出した粒子はサイクロン２で補集される。粒子は、シ
ールポット５を経て直接燃焼室へ戻り、一部の粒子は灰
取り出し調整弁４を経て流動層熱交換部７へ入り、ここ
で蒸気過熱器６により冷却された後燃焼室へ戻る。流動
用空気ブロワ９の出口にダクトバーナ８を設置し、流動
用空気を加熱して流動層熱交換部７の内部粒子を加熱す
る。この粒子は、蒸気過熱器６に充分なる熱を与えると
共に、火炉１の燃焼室に戻って燃焼室温度を定格値に維
持することができる。In this embodiment, the particles that have flown out of the combustion chamber of the furnace 1 are collected by the cyclone 2. The particles directly return to the combustion chamber through the seal pot 5, and some particles enter the fluidized bed heat exchange section 7 through the ash extraction adjusting valve 4 where they are cooled by the steam superheater 6 and then return to the combustion chamber. . A duct burner 8 is installed at the outlet of the fluidizing air blower 9 to heat the fluidizing air to heat the internal particles of the fluidized bed heat exchange section 7. These particles give sufficient heat to the steam superheater 6 and can return to the combustion chamber of the furnace 1 to maintain the combustion chamber temperature at the rated value.
【００１３】図２は、内部循環流動層ボイラに係る本発
明の第２実施例を示す。内部循環流動層ボイラにおいて
は、図２に見るごとく、火炉１の底部に風箱１１、火炉
内の仕切り板１２及び火炉側面に空気取入れダクト１３
を有し、この空気取入れダクト１３内にダクトバーナ８
が設けられている。FIG. 2 shows a second embodiment of the present invention relating to an internal circulating fluidized bed boiler. In the internal circulating fluidized bed boiler, as shown in FIG. 2, a wind box 11 is provided at the bottom of the furnace 1, a partition plate 12 inside the furnace, and an air intake duct 13 at the side of the furnace.
And a duct burner 8 in the air intake duct 13.
Is provided.
【００１４】流動用空気は、風箱１１を通り火炉１へ送
りこまれ流動燃焼が行われる。燃焼粒子は、仕切り板１
２をあふれ出て、流動層熱交換部７に至り、ここにダク
トバーナ８で加熱された空気が熱交換量調節用空気とし
て送りこまれる。これにより内部粒子が加熱され、第１
実施例と同様燃焼室温度を定格値に維持する。The fluidizing air is sent to the furnace 1 through the wind box 11 and fluidized and burned. Combustion particles, partition plate 1
2 overflows to reach the fluidized bed heat exchange section 7, where the air heated by the duct burner 8 is sent as heat exchange amount adjusting air. This heats the internal particles,
The combustion chamber temperature is maintained at the rated value as in the embodiment.
【００１５】図３は、本発明の第３実施例を示す。本実
施例では、図４の従来例にみられる流動層熱交換部７の
内部にランスバーナ１４を設けてあり、このランスバー
ナ１４により流動層熱交換部７の内部粒子を加熱し、上
記実施例と同様に燃焼室温度を維持する。FIG. 3 shows a third embodiment of the present invention. In this embodiment, a lance burner 14 is provided inside the fluidized bed heat exchange section 7 shown in the conventional example of FIG. 4, and the lance burner 14 heats the internal particles of the fluidized bed heat exchange section 7 to carry out the above-mentioned operation. The combustion chamber temperature is maintained as in the example.
【００１６】[0016]
【発明の効果】本発明の循環流動層ボイラにおいては、
流動層熱交換部の粒子に熱を加えることにより、同部に
おける熱交換量の制約がなくなり、流動層熱交換部から
燃焼室に戻る粒子の温度を調節して燃焼室温度を定格値
に維持できる。従って、広範囲の負荷において流動層熱
交換による蒸気過熱器の出口蒸気温度を定格値に維持で
きる。In the circulating fluidized bed boiler of the present invention,
By applying heat to the particles in the fluidized bed heat exchange section, there is no restriction on the amount of heat exchange in that section, and the temperature of the particles returning from the fluidized bed heat exchange section to the combustion chamber is adjusted to maintain the combustion chamber temperature at the rated value. it can. Therefore, the outlet steam temperature of the steam superheater due to the fluidized bed heat exchange can be maintained at the rated value in a wide range of loads.
【００１７】また、蒸気の過熱を流動層熱交換部のみで
行う場合にも、流動層熱交換部の粒子に熱を与えること
により、必要な蒸気過熱が達成される。Even when the superheat of the steam is carried out only in the fluidized bed heat exchange section, the necessary steam superheat is achieved by applying heat to the particles in the fluidized bed heat exchange section.
【図１】本発明の第１実施例に係る循環流動層ボイラの
系統図である。FIG. 1 is a system diagram of a circulating fluidized bed boiler according to a first embodiment of the present invention.
【図２】本発明の第２実施例に係る内部循環流動層ボイ
ラの図である。FIG. 2 is a diagram of an internal circulation fluidized bed boiler according to a second embodiment of the present invention.
【図３】本発明の第３実施例に係る循環流動層ボイラの
系統図である。FIG. 3 is a system diagram of a circulating fluidized bed boiler according to a third embodiment of the present invention.
【図４】従来の循環流動層ボイラの系統図である。FIG. 4 is a system diagram of a conventional circulating fluidized bed boiler.
１ 火炉 ２ サイクロン ３ 後部煙道 ４ 灰取り出し調整弁 ５ シールポット ６ 蒸気過熱器 ７ 流動層熱交換部 ８ ダクトバーナ ９ ブロワ １０ 中・低温蒸気過熱器 １１ 風箱 １２ 仕切り板 １３ 空気取入れダクト １４ ランスバーナ 1 Fire Furnace 2 Cyclone 3 Rear Flue 4 Ash Removal Control Valve 5 Seal Pot 6 Steam Superheater 7 Fluidized Bed Heat Exchanger 8 Duct Burner 9 Blower 10 Middle / Low Temperature Steam Superheater 11 Air Box 12 Partition Plate 13 Air Intake Duct 14 Lance Burner
Claims (1)
動層熱交換部を備え、冷却された粒子を燃焼室に戻す循
環流動層ボイラにおいて、該流動層熱交換部の粒子を加
熱する手段を備えたことを特徴とする循環流動層ボイ
ラ。1. A circulating fluidized bed boiler, comprising a fluidized bed heat exchange section for cooling particles circulating from a combustion chamber and returning the cooled particles to the combustion chamber, wherein the particles in the fluidized bed heat exchange section are heated. A circulating fluidized bed boiler provided with means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11175895A JPH08303718A (en) | 1995-05-10 | 1995-05-10 | Circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11175895A JPH08303718A (en) | 1995-05-10 | 1995-05-10 | Circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08303718A true JPH08303718A (en) | 1996-11-22 |
Family
ID=14569449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11175895A Withdrawn JPH08303718A (en) | 1995-05-10 | 1995-05-10 | Circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08303718A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2014119612A1 (en) * | 2013-01-31 | 2017-01-26 | 住友重機械工業株式会社 | Fluidized bed combustion furnace and operation method of fluidized bed combustion furnace |
| EP3415816B1 (en) | 2017-05-10 | 2020-10-28 | Valmet Technologies Oy | A method and a system for extending the load range of a power plant comprising a boiler supplying steam to a steam turbine |
-
1995
- 1995-05-10 JP JP11175895A patent/JPH08303718A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2014119612A1 (en) * | 2013-01-31 | 2017-01-26 | 住友重機械工業株式会社 | Fluidized bed combustion furnace and operation method of fluidized bed combustion furnace |
| EP3415816B1 (en) | 2017-05-10 | 2020-10-28 | Valmet Technologies Oy | A method and a system for extending the load range of a power plant comprising a boiler supplying steam to a steam turbine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020806 |