JPH06257716A - Pressurized fluidized bed type boiler - Google Patents
Pressurized fluidized bed type boilerInfo
- Publication number
- JPH06257716A JPH06257716A JP4646593A JP4646593A JPH06257716A JP H06257716 A JPH06257716 A JP H06257716A JP 4646593 A JP4646593 A JP 4646593A JP 4646593 A JP4646593 A JP 4646593A JP H06257716 A JPH06257716 A JP H06257716A
- Authority
- JP
- Japan
- Prior art keywords
- fluidized bed
- combustion furnace
- fluidized
- temperature
- medium tank
- 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
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、負荷調整を流動層高の
増減によって行う加圧型流動床ボイラに係わり、特に流
動媒体タンクの放散熱損失の低減により流動媒体の温度
低下を防止し、流動層高増加時に流動層燃焼炉に供給さ
れる流動媒体による流動層燃焼炉内の温度低下を低減す
るのに好適な位置に流動媒体タンクを設置した加圧型流
動床ボイラに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure type fluidized bed boiler in which load adjustment is performed by increasing or decreasing the height of a fluidized bed. The present invention relates to a pressurized fluidized bed boiler in which a fluidized medium tank is installed at a position suitable for reducing the temperature decrease in the fluidized bed combustion furnace due to the fluidized medium supplied to the fluidized bed combustion furnace when the bed height increases.
【０００２】[0002]
【従来の技術】従来の加圧型流動床ボイラの構成図を図
３に示す。加圧容器１内に収納された流動層燃焼炉（以
後、単に燃焼炉と言うことがある。）２は、その底部に
空気分散板３が設けられ、その上に流動媒体５が充填さ
れている。圧縮空気が熱風炉６から圧縮空気配管７より
加圧容器１内に供給された後、燃焼用空気として空気分
散板３を通って、燃焼炉２内の流動媒体５を流動化して
流動層１０を形成する。このとき、石炭等の燃料（６ｍ
ｍから８ｍｍに粉砕された石炭と微粉炭と水とを混合し
た燃料）も燃料配管１１から熱風炉６を経由して燃焼炉
２内の流動層１０に導入される。燃料の流動層１０内で
の燃焼により、燃焼炉２内に配置された冷却管１２が加
熱される。冷却管１２内の給水が流動層１０で加熱され
スチームが生成する。また、燃焼炉２で生成した排ガス
は排ガス配管１４を通ってガスタービン（図示省略）等
に導入される。2. Description of the Related Art FIG. 3 shows a configuration diagram of a conventional pressurized fluidized bed boiler. A fluidized bed combustion furnace (hereinafter sometimes simply referred to as a combustion furnace) 2 housed in a pressure vessel 1 is provided with an air dispersion plate 3 at the bottom thereof, and a fluidized medium 5 is filled therein. There is. After compressed air is supplied from the hot-air stove 6 into the pressurized container 1 through the compressed air pipe 7, the fluidized medium 5 in the combustion furnace 2 is fluidized by passing through the air dispersion plate 3 as combustion air to fluidize the fluidized bed 10. To form. At this time, fuel such as coal (6 m
Fuel mixed with coal, pulverized coal, and water pulverized from m to 8 mm) is also introduced from the fuel pipe 11 to the fluidized bed 10 in the combustion furnace 2 via the hot air stove 6. The combustion of the fuel in the fluidized bed 10 heats the cooling pipe 12 arranged in the combustion furnace 2. The feed water in the cooling pipe 12 is heated in the fluidized bed 10 to generate steam. Further, the exhaust gas generated in the combustion furnace 2 is introduced into a gas turbine (not shown) or the like through the exhaust gas pipe 14.
【０００３】また、加圧容器１内には燃焼炉２とは別に
流動媒体タンク４も収納されていて、負荷増加時は、流
動媒体タンク４から流動媒体５を流動媒体供給管１５を
経て燃焼炉２内に供給し、燃焼炉２内の流動層１０の層
高を高くし、流動層１０と冷却管１２の伝熱面の接触面
積を増やすことにより負荷上昇に対応させることができ
る。また、負荷減少時はその逆動作となる。流動媒体タ
ンク４から流動媒体５を燃焼炉２内に供給するときは流
動媒体供給管１５に接続する圧縮空気配管１６の媒体供
給空気弁１８を開放してから空気を導入することで行
い、燃焼炉２から流動媒体タンク４に流動媒体５を返送
するときは圧縮空気配管１６の媒体抜き出し空気弁１９
を開放して燃焼炉２の底部の流動媒体抜き出し配管２０
から流動媒体５を抜き出す。また、流動層燃焼炉２と流
動媒体タンク４との内圧を等しくするために、両者の空
塔部は均圧弁２１を持つ配管２２で接続されている。A fluidized medium tank 4 is also housed in the pressure vessel 1 in addition to the combustion furnace 2. When the load increases, the fluidized medium 5 is burned from the fluidized medium tank 4 through a fluidized medium supply pipe 15. It is possible to cope with the load increase by supplying the gas into the furnace 2 to increase the bed height of the fluidized bed 10 in the combustion furnace 2 and increasing the contact area between the fluidized bed 10 and the heat transfer surface of the cooling pipe 12. When the load is reduced, the reverse operation is performed. When the fluidized medium 5 is supplied from the fluidized medium tank 4 into the combustion furnace 2, it is performed by opening the medium supply air valve 18 of the compressed air pipe 16 connected to the fluidized medium supply pipe 15 and then introducing air. When returning the fluidized medium 5 from the furnace 2 to the fluidized medium tank 4, the medium withdrawal air valve 19 of the compressed air pipe 16 is returned.
Open to open the fluidized medium extraction pipe 20 at the bottom of the combustion furnace 2.
The fluid medium 5 is extracted from the. Further, in order to equalize the internal pressures of the fluidized bed combustion furnace 2 and the fluidized medium tank 4, the empty column parts of both are connected by a pipe 22 having a pressure equalizing valve 21.
【０００４】加圧容器１内の温度は３００℃程度に保た
れているが、流動媒体タンク４が燃焼炉２の外に設置さ
れていて、また、流動媒体５を流動層燃焼炉２から抜き
出し流動媒体タンク４で貯蔵している時には、これを水
冷しているため、流動媒体タンク４内の温度が４００℃
程度と、燃焼炉２内の温度８６０℃よりも大幅に低くな
っている。そのため、負荷増加時に流動層１０の層高を
高くするために温度の低い流動媒体５を流動層燃焼炉２
内に供給すると、図４に示すように一時的に燃焼炉２内
の流動層１０の温度が低下する。そのため、ボイラ蒸発
量および蒸気温度の低下となり、負荷増加の妨げとな
り、燃焼炉２内の温度が回復するまでの時間だけ負荷上
昇が遅れることになる。The temperature in the pressure vessel 1 is maintained at about 300 ° C., but the fluidized medium tank 4 is installed outside the combustion furnace 2, and the fluidized medium 5 is extracted from the fluidized bed combustion furnace 2. Since it is water-cooled when it is stored in the fluidized medium tank 4, the temperature in the fluidized medium tank 4 is 400 ° C.
And the temperature inside the combustion furnace 2 is significantly lower than 860 ° C. Therefore, in order to increase the bed height of the fluidized bed 10 when the load increases, the fluidized medium 5 having a low temperature is used as the fluidized bed combustion furnace 2
When supplied to the inside, the temperature of the fluidized bed 10 in the combustion furnace 2 is temporarily lowered as shown in FIG. Therefore, the boiler evaporation amount and the steam temperature decrease, which hinders the load increase, and the load increase is delayed by the time until the temperature in the combustion furnace 2 recovers.
【０００５】[0005]
【発明が解決しようとする課題】上述した従来技術にお
いては、速い負荷変化に対する追従性が配慮されておら
ず、負荷増加時に、流動層１０の層高を高くするために
低温の流動媒体５を燃焼炉２内に供給すると、一時的に
燃焼炉２内の温度が低下し、ボイラ蒸発量および蒸気温
度の低下により、負荷増加に遅れが出るという問題があ
った。本発明の目的は、負荷増加時における流動層燃焼
炉内温度の低下を小さくし、流動層燃焼炉内温度を短時
間で安定させることができる負荷追従性に優れた加圧型
流動床ボイラを提供することにある。In the above-mentioned prior art, the followability to a rapid load change is not taken into consideration, and the low temperature fluidized medium 5 is used to increase the bed height of the fluidized bed 10 when the load increases. When the gas is supplied into the combustion furnace 2, the temperature inside the combustion furnace 2 is temporarily lowered, and there is a problem that the load increase is delayed due to the decrease in the boiler evaporation amount and the steam temperature. An object of the present invention is to provide a pressure type fluidized bed boiler excellent in load followability capable of reducing the decrease in temperature in the fluidized bed combustion furnace when the load increases and stabilizing the temperature in the fluidized bed combustion furnace in a short time. To do.
【０００６】[0006]
【課題を解決するための手段】本発明の上記目的は、次
の構成により達成される。すなわち、流動層燃焼炉と該
流動層燃焼炉を加圧状態に保つための加圧容器と流動層
燃焼炉の流動層高を増減するための流動媒体タンクを少
なくとも備えた加圧型流動床ボイラにおいて、前記流動
媒体タンクを流動層燃焼炉内の燃焼ガス通過部に設置し
た加圧型流動床ボイラである。The above object of the present invention can be achieved by the following constitutions. That is, in a pressurized fluidized bed boiler comprising at least a fluidized bed combustion furnace, a pressure vessel for maintaining the fluidized bed combustion furnace in a pressurized state, and a fluidized medium tank for increasing or decreasing the fluidized bed height of the fluidized bed combustion furnace. A pressurized fluidized bed boiler in which the fluidized medium tank is installed in a combustion gas passage in a fluidized bed combustion furnace.
【０００７】[0007]
【作用】流動媒体タンクを、燃焼炉内上部の燃焼ガス通
過部に設置することにより、流動媒体タンク内温度を極
力低下させないで、燃焼炉内温度近くに保つことができ
る。これにより、流動媒体を流動層燃焼炉に供給した時
の流動層燃焼炉内温度の低下が小さくなり、流動層燃焼
炉内温度を短時間で安定させることができ、負荷追従性
を良くすることができる。By installing the fluidized medium tank in the combustion gas passage in the upper part of the combustion furnace, the temperature in the fluidized medium tank can be kept near the temperature in the combustion furnace without being lowered as much as possible. As a result, a decrease in the temperature inside the fluidized bed combustion furnace when the fluidized medium is supplied to the fluidized bed combustion furnace is reduced, the temperature inside the fluidized bed combustion furnace can be stabilized in a short time, and load followability is improved. You can
【０００８】[0008]
【実施例】以下に本発明の実施例を挙げ、図面を用いて
さらに詳細に説明する。図１は本発明の実施例を示す構
成図である。図１において、図３に示した加圧型流動床
ボイラと同一部材は同一番号を付している。燃焼炉２内
の流動層１０はボイラ負荷に応じてその高さを変えられ
る。ボイラ負荷を増加する時は、流動層１０の層高を高
くして冷却管１２の伝熱面と流動層１０の接触面積を増
加させ、ボイラ負荷を減少する時は、その逆に流動層１
０の層高を低くする。流動層１０の層高を高くする時
は、媒体供給空気弁１８を開けて、流動媒体タンク４か
ら流動媒体供給管１５を経て流動媒体５を圧縮空気配管
１６からの空気で流動層１０に供給する。また、流動層
１０の層高を低くする時は、媒体抜き出し空気弁１９を
開けて、流動層１０から流動媒体抜き出し配管２０で流
動媒体５を抜き出し、流動媒体タンク４に戻す。Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, the same members as those of the pressure type fluidized bed boiler shown in FIG. 3 are designated by the same reference numerals. The height of the fluidized bed 10 in the combustion furnace 2 can be changed according to the boiler load. When the boiler load is increased, the bed height of the fluidized bed 10 is increased to increase the contact area between the heat transfer surface of the cooling pipe 12 and the fluidized bed 10, and when the boiler load is decreased, conversely.
Lower the layer height of 0. When increasing the bed height of the fluidized bed 10, the medium supply air valve 18 is opened and the fluidized medium 5 is supplied to the fluidized bed 10 from the fluidized medium tank 4 through the fluidized medium supply pipe 15 by the air from the compressed air pipe 16. To do. Further, when lowering the bed height of the fluidized bed 10, the medium withdrawing air valve 19 is opened, the fluidized medium 5 is withdrawn from the fluidized bed 10 with the fluidized medium withdrawing pipe 20, and returned to the fluidized medium tank 4.
【０００９】本実施例の特徴は流動媒体タンク４が燃焼
炉２の空塔部、すなわち燃焼炉内で流動床上部の燃焼ガ
ス通過部に設置されていることである。そのため、流動
媒体タンク４内にある流動媒体５の温度低下が少なく、
流動層燃焼炉２の温度に近い温度が保つことができる。
このことにより、負荷増加時に流動媒体５を流動媒体タ
ンク４から燃焼炉２内の流動層１０に供給した時の流動
層燃焼炉２の温度の低下を少なくすることができ、短時
間で層内温度を安定させることができる。このとき、流
動媒体タンク４が流動層１０内でガスの流れの障害とな
り、燃料の燃焼を局部的に不均一にしないように、燃焼
炉２の流動層１０表面から数メートル以上高く離れた位
置に配置される。また、流動層燃焼炉２の高さに制限が
ある場合には燃焼炉２の排ガス通過部と流動媒体タンク
の幅を広くし、流動媒体タンクの設置スペースをとるこ
とで対応できる。図２は流動媒体タンク４を燃焼炉２内
に設置要領の実施例を示す構成図である。流動媒体タン
ク４は燃焼炉２の上部から水管２３、例えば節炭器管の
一部を使って支持する。また、流動媒体タンク４の内外
表面にはキャスタ２４を施工し、過度の熱および流動あ
るいは飛散粒子の衝突による摩耗損傷から保護する構造
とする。流動媒体タンク４に使用可能な材質を考慮し、
流動媒体タンク温度は７００℃程度とする。The feature of this embodiment is that the fluidized medium tank 4 is installed in the empty tower portion of the combustion furnace 2, that is, in the combustion gas passage portion above the fluidized bed in the combustion furnace. Therefore, the temperature drop of the fluidized medium 5 in the fluidized medium tank 4 is small,
The temperature close to the temperature of the fluidized bed combustion furnace 2 can be maintained.
As a result, when the fluidized medium 5 is supplied from the fluidized medium tank 4 to the fluidized bed 10 in the combustion furnace 2 when the load is increased, the temperature drop in the fluidized bed combustion furnace 2 can be reduced, and the inside of the bed can be reduced in a short time. The temperature can be stabilized. At this time, in order to prevent the fluidized medium tank 4 from interfering with the flow of gas in the fluidized bed 10 and locally unevenly burning the fuel, a position separated by several meters or more from the surface of the fluidized bed 10 of the combustion furnace 2 is provided. Is located in. If the height of the fluidized bed combustion furnace 2 is limited, the width of the exhaust gas passage portion of the combustion furnace 2 and the fluidized medium tank can be widened so that a space for installing the fluidized medium tank can be taken. FIG. 2 is a configuration diagram showing an embodiment in which the fluidized medium tank 4 is installed in the combustion furnace 2. The fluidized medium tank 4 is supported from the upper part of the combustion furnace 2 by using a water pipe 23, for example, a part of a economizer pipe. Further, casters 24 are provided on the inner and outer surfaces of the fluidized medium tank 4 so as to protect the fluidized medium tank 4 from wear and damage caused by excessive heat and flow or collision of scattered particles. Considering the materials that can be used for the fluidized medium tank 4,
The fluid medium tank temperature is about 700 ° C.
【００１０】[0010]
【発明の効果】本発明によれば、負荷増加時に流動層高
を上昇させるために流動媒体を流動層燃焼炉に供給した
時の、流動層燃焼炉内の温度低下を小さくし、流動層燃
焼炉内温度を短時間で安定させることができ、負荷追従
性を良くすることができる。According to the present invention, when the fluidized medium is supplied to the fluidized bed combustion furnace in order to increase the fluidized bed height when the load is increased, the temperature drop in the fluidized bed combustion furnace is reduced, and the fluidized bed combustion is performed. The temperature in the furnace can be stabilized in a short time, and the load followability can be improved.
【図１】 本発明の実施例において例示した加圧型流動
床ボイラを示す構成図。FIG. 1 is a configuration diagram showing a pressurized fluidized bed boiler exemplified in an embodiment of the present invention.
【図２】 本発明の実施例において流動媒体タンクの設
置要領を示す構成図。FIG. 2 is a configuration diagram showing an installation procedure of a fluidized medium tank in an embodiment of the present invention.
【図３】 従来の加圧型流動床ボイラを示す構成図。FIG. 3 is a configuration diagram showing a conventional pressurized fluidized bed boiler.
【図４】 従来の加圧型流動床ボイラにおける負荷上昇
時の層温度特性を示す図。FIG. 4 is a diagram showing bed temperature characteristics when a load is increased in a conventional pressurized fluidized bed boiler.
１…加圧容器、２…流動層燃焼炉、４…流動媒体タン
ク、５…流動媒体、１０…流動層、１２…冷却管、１５
…流動媒体供給管、１６…圧縮空気配管 ２０…流動媒体抜き出し配管、２３…水管、２４…キャ
スタDESCRIPTION OF SYMBOLS 1 ... Pressurization container, 2 ... Fluidized bed combustion furnace, 4 ... Fluidized medium tank, 5 ... Fluidized medium, 10 ... Fluidized bed, 12 ... Cooling pipe, 15
... Fluid medium supply pipe, 16 ... Compressed air pipe 20 ... Fluid medium extraction pipe, 23 ... Water pipe, 24 ... Casters
Claims (1)
態に保つための加圧容器と流動層燃焼炉の流動層高を増
減するための流動媒体タンクを少なくとも備えた加圧型
流動床ボイラにおいて、前記流動媒体タンクを流動層燃
焼炉内の燃焼ガス通過部に設置したことを特徴とする加
圧型流動床ボイラ。1. A pressurized fluidized flow comprising at least a fluidized bed combustion furnace, a pressure vessel for maintaining the fluidized bed combustion furnace in a pressurized state, and a fluidized medium tank for increasing or decreasing the fluidized bed height of the fluidized bed combustion furnace. In the bed boiler, the pressurized fluidized bed boiler is characterized in that the fluidized medium tank is installed in a combustion gas passage in a fluidized bed combustion furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4646593A JPH06257716A (en) | 1993-03-08 | 1993-03-08 | Pressurized fluidized bed type boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4646593A JPH06257716A (en) | 1993-03-08 | 1993-03-08 | Pressurized fluidized bed type boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06257716A true JPH06257716A (en) | 1994-09-16 |
Family
ID=12747923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4646593A Pending JPH06257716A (en) | 1993-03-08 | 1993-03-08 | Pressurized fluidized bed type boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06257716A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015151631A1 (en) * | 2014-03-31 | 2015-10-08 | 住友重機械工業株式会社 | Fluidized-bed type combustion equipment and method for supplying fluidized medium to fluidized-bed combustion furnace |
-
1993
- 1993-03-08 JP JP4646593A patent/JPH06257716A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015151631A1 (en) * | 2014-03-31 | 2015-10-08 | 住友重機械工業株式会社 | Fluidized-bed type combustion equipment and method for supplying fluidized medium to fluidized-bed combustion furnace |
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