JPH0113209Y2 - - Google Patents
Info
- Publication number
- JPH0113209Y2 JPH0113209Y2 JP1981153629U JP15362981U JPH0113209Y2 JP H0113209 Y2 JPH0113209 Y2 JP H0113209Y2 JP 1981153629 U JP1981153629 U JP 1981153629U JP 15362981 U JP15362981 U JP 15362981U JP H0113209 Y2 JPH0113209 Y2 JP H0113209Y2
- Authority
- JP
- Japan
- Prior art keywords
- fluidized
- air
- combustion
- air supply
- supply path
- 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.)
- Expired
Links
- 238000002485 combustion reaction Methods 0.000 claims description 56
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 description 7
- 238000007664 blowing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000010763 heavy fuel oil Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Air Supply (AREA)
Description
【考案の詳細な説明】
本考案は、流動床燃焼炉、特にウインドボツク
スを少くとも２分割した流動床燃焼炉に於ける流
動燃焼用空気供給装置に関するものである。[Detailed Description of the Invention] The present invention relates to an air supply device for fluidized combustion in a fluidized bed combustion furnace, particularly in a fluidized bed combustion furnace in which a wind box is divided into at least two parts.
第１図に示す如く流動床燃焼炉１の流動層２内
に伝熱管３を配管したボイラ又は加熱器に於いて
は、近時、ウインドボツクス４を隔壁５にて少く
とも２分割し、一部のウインドボツクス４の空気
ノズル６からの流動燃焼用空気の吹込みと燃料供
給路７からの燃料及び流動媒体（石灰石）の供給
を開始したり停止したりして、流動層２の割合を
変え、伝熱管３による収熱量を制御するか或いは
流動床燃焼炉１を数台もち、その運転台数を変え
ることによつて負荷を増減することが行われてい
る。 As shown in FIG. 1, in boilers or heaters in which heat transfer tubes 3 are installed in the fluidized bed 2 of a fluidized bed combustion furnace 1, the wind box 4 is divided into at least two parts by a partition 5, and one The proportion of the fluidized bed 2 is controlled by starting and stopping the blowing of fluidized combustion air from the air nozzle 6 of the wind box 4 and the supply of fuel and fluidized medium (limestone) from the fuel supply path 7. The load is increased or decreased by controlling the amount of heat absorbed by the heat exchanger tubes 3, or by having several fluidized bed combustion furnaces 1 and changing the number of them in operation.
ところで、一部のウインドボツクス４への流動
燃焼用空気の供給を停止し、空気ノズル６からの
吹込みを停止して、一部流動燃焼を停止する際に
は、流動燃焼用空気供給装置８の前記ウインドボ
ツクス４に連なる空気供給路９のダンパ１０を閉
めるのであるが、この種空気供給路９のダンパ１
０は構造上シール性が悪く、その上押込送風機１
１により空気予熱器１２、熱風炉１３を経由して
流動燃焼用空気が高い圧力で供給されているの
で、ダンパ１０を閉めても流動燃焼用空気が数％
乃至10％程度漏れてしまうものである。 By the way, when stopping the supply of fluidized combustion air to some of the wind boxes 4 and stopping blowing from the air nozzle 6 to partially stop fluidized combustion, the fluidized combustion air supply device 8 The damper 10 of the air supply path 9 connected to the window box 4 of this type is closed.
0 has poor sealing performance due to its structure, and the forced air blower 1
1, the fluidized combustion air is supplied at high pressure via the air preheater 12 and the hot stove 13, so even if the damper 10 is closed, the fluidized combustion air remains only a few percent.
Approximately 10% to 10% will leak.
その結果、流動燃焼を停止した状態の固定層
２′中の残留燃料が流動しないまま空気ノズル６
から漏出する空気により燃焼せしめられて、固定
層２′中の灰が溶けて下部炉床１４上に付着堆積
したり、固定層２′を通つて漏洩してきた空気が
流動層２内または流動層２の直上で、流動燃焼を
継続している流動層２で発生した燃焼ガスと混合
されるので、流動層２内又は流動層２の直上での
空気比が変動し、NOx還元の為の雰囲気が破壊
され、流動床燃焼炉１の空塔部に設けられた２段
燃焼空気吹込装置１８の効果が十分発揮できず、
NOxの発生量が増加する。また排ガス中のO2％
が変動し、ボイラ効果の低下を来たしたりするも
のである。また固定層２′が空気ノズル６から漏
出する空気に短時間で冷やされて温度が降下する
ので、再起動時には加熱に長時間要するものであ
る。 As a result, the residual fuel in the fixed bed 2', in which fluidized combustion has been stopped, flows through the air nozzle 6 without flowing.
The ash in the fixed bed 2' is melted and deposited on the lower hearth 14 due to the combustion caused by the air leaking from the fixed bed 2', and the air leaking through the fixed bed 2' is burned in the fluidized bed 2 or the fluidized bed. 2, the air ratio within the fluidized bed 2 or just above the fluidized bed 2 changes, creating an atmosphere for NOx reduction. was destroyed, and the two-stage combustion air blowing device 18 installed in the empty tower part of the fluidized bed combustion furnace 1 could not be fully effective.
The amount of NOx generated increases. Also O 2 % in exhaust gas
This can lead to fluctuations in the boiler efficiency, resulting in a decrease in boiler efficiency. Further, since the fixed layer 2' is cooled in a short time by the air leaking from the air nozzle 6 and its temperature drops, it takes a long time to heat up when restarting.
前記空気供給路６に於いて、流動床燃焼炉１の
分割されたウインドボツクス４への流動燃焼用空
気の供給を停止した際、該空気の漏洩を完全に防
止するには、高精度の複雑な各種機器設備を必要
として、流動床燃焼炉１の付帯設備費用が嵩むば
かりではなく、取扱操作も甚だ面倒なものとなる
ものである。 In the air supply path 6, in order to completely prevent the air from leaking when the supply of fluidized combustion air to the divided wind boxes 4 of the fluidized bed combustion furnace 1 is stopped, it is necessary to This not only increases the cost of the ancillary equipment for the fluidized bed combustion furnace 1, but also makes handling operations extremely troublesome.
本考案は、上記諸事情に鑑みなされたもので、
流動床燃焼炉の分割されたウインドボツクスの一
部のウインドボツクスへの空気供給路のダンパを
閉じて流動燃焼用空気の供給を停止し且つ燃料供
給路からの燃料及び流動媒体の供給を停止して固
定層を形成した際、閉じたダンパから漏れた流動
燃焼用空気を最小限ウインドボツクス内に入れて
流動燃焼炉の炉内圧と固定層側のウインドボツク
ス内の風圧を略均等にして、流動燃焼用空気を押
込送風機の上流に戻すようにした流動床燃焼炉に
於ける流動燃焼用空気供給装置を提供せんとする
ものである。 This idea was created in view of the above circumstances.
Closing the damper of the air supply path to some of the divided wind boxes of the fluidized bed combustion furnace to stop the supply of fluidized combustion air, and also stop the supply of fuel and fluidized medium from the fuel supply path. When a fixed bed is formed, the fluidized combustion air that leaked from the closed damper is put into the wind box to a minimum to equalize the internal pressure of the fluidized combustion furnace and the wind pressure in the wind box on the fixed bed side. It is an object of the present invention to provide a fluidized combustion air supply device for a fluidized bed combustion furnace in which combustion air is returned upstream of a forced air blower.
以下本考案による流動燃焼用空気供給装置の一
実施例を第２図によつて説明する。図中第１図と
同一符号は、同一物を示すので、その説明を省略
する。図示の如くウインドボツクス４を少くとも
２分割した流動床燃焼炉１に於いて、各ウインド
ボツクス４に連なる流動燃焼用空気供給路６のダ
ンパ１０の出口側に、夫々流動燃焼用空気の小口
径の戻り管１５を設け、各戻り管１５は入口に開
閉弁１６を設けると共に１本の戻り管１７に集合
接続し、この１本の戻り管１７は流動燃焼用空気
供給路６の押込送風機１１の上流側に接続してあ
る。 An embodiment of the fluidized combustion air supply device according to the present invention will be described below with reference to FIG. Since the same reference numerals in the figure as in FIG. 1 indicate the same parts, the explanation thereof will be omitted. In the fluidized bed combustion furnace 1 in which the wind box 4 is divided into at least two parts as shown in the figure, a small caliber of fluidized combustion air is provided at the outlet side of the damper 10 of the fluidized combustion air supply path 6 connected to each wind box 4. Each return pipe 15 is provided with an on-off valve 16 at its inlet and collectively connected to one return pipe 17, and this one return pipe 17 is connected to the forced blower 11 of the fluidized combustion air supply path 6. It is connected to the upstream side of
以上の如く構成された本考案の流動燃焼用空気
供給装置によれば、分割された一部のウインドボ
ツクス４の空気ノズル６からの流動燃焼用空気の
吹込みを停止すべくそのウインドボツクス４に連
なる空気供給路６のダンパ１０を閉じ、また燃料
供給路７からの燃料及び流動媒体の供給を停止し
て、流動床燃焼炉１内の一部に鎖線に示す如く固
定層２′を形成した際、前記の閉じたダンパ１０
の出口側に接続した小口径の戻り管１５の入口の
開閉弁１６を開き、閉じたダンパ１０から漏れた
流動燃焼用空気を戻り管１５を通して空気供給路
６の押込送風機１１の上流側に戻す。即ち、漏れ
た流動燃焼用空気がウインドボツクス４内に入
れ、ウインドボツクス４内の風圧を流動床燃焼炉
１内の圧力と略均等にした後それ以上漏れてくる
流動燃焼用空気は圧力の低い小口径の戻り管１５
を通つて押込送風機１１の上流側に戻され、再び
押込送風機１１により空気供給路６を通して供給
される。 According to the fluidized combustion air supply device of the present invention configured as described above, in order to stop blowing fluidized combustion air from the air nozzles 6 of some of the divided wind boxes 4. The damper 10 of the continuous air supply path 6 was closed, and the supply of fuel and fluidized medium from the fuel supply path 7 was stopped to form a fixed bed 2' in a part of the fluidized bed combustion furnace 1 as shown by the chain line. When the damper 10 is closed,
The opening/closing valve 16 at the inlet of the small-diameter return pipe 15 connected to the outlet side of is opened, and the flowing combustion air leaking from the closed damper 10 is returned to the upstream side of the forced blower 11 in the air supply path 6 through the return pipe 15. . That is, after the leaked fluidized combustion air is introduced into the wind box 4 and the wind pressure inside the wind box 4 is made approximately equal to the pressure inside the fluidized bed combustion furnace 1, the fluidized combustion air that leaks out has a lower pressure. Small diameter return pipe 15
The air is returned to the upstream side of the forced air blower 11 through the forced air blower 11, and is again supplied through the air supply path 6 by the forced air blower 11.
従つて流動燃焼を停止した状態の固定層２′中
には空気が漏出せず、固定層２′中の残留燃料が
燃焼することがないので、固定層２′中の灰が溶
けることがなく、下部炉床１４上に灰が付着堆積
することがなく、また固定層２′中から空気が漏
出しないので、NOxの発生量の増加やボイラ効
率の低下がない。またウインドボツクス４内には
新たに空気が漏れて入つてくるようなことがない
ので、固定層２′が空気の流れにより冷やされて
温度降下するようなことがなく、或る程度長時間
停止した後でも再起動時には直ちに流動燃焼する
ことができる。さらにまた開閉弁１６を制御して
ウインドボツクス４内の圧力を大略炉内のガス圧
と等しくなるようにしているので固定層２′を通
して流動床燃焼炉１内の燃焼ガスがウインドボツ
クス４内に逆流することがないので、空気供給路
９を通つてダンパ１０の〓間から漏出するような
こともない等の優れた作用効果がある。しかも本
考案の流動燃焼用空気供給装置は、流動燃焼用空
気供給路のダンパの出口側に、開閉弁を有する流
動燃焼用空気の小口径の戻り管を設け、これを流
動燃焼用空気供給路の押込送風機の上流側に接続
しただけで、前記した優れた作用効果を奏するこ
とができるばかりではなく、既存の流動床燃焼炉
にも簡単に採用できて設備費用も低廉で、取扱操
作も至つて簡単である等の効果もある。 Therefore, air does not leak into the fixed bed 2' when fluidized combustion is stopped, and residual fuel in the fixed bed 2' does not burn, so the ash in the fixed bed 2' does not melt. Since ash does not adhere and accumulate on the lower hearth 14 and air does not leak out from the fixed bed 2', there is no increase in the amount of NOx generated or a decrease in boiler efficiency. In addition, since no new air leaks into the wind box 4, the fixed layer 2' is not cooled by the air flow and its temperature does not drop, and the wind box 4 is stopped for a certain period of time. Even after this, fluid combustion can occur immediately upon restart. Furthermore, the on-off valve 16 is controlled so that the pressure in the wind box 4 is approximately equal to the gas pressure in the furnace, so that the combustion gas in the fluidized bed combustion furnace 1 flows into the wind box 4 through the fixed bed 2'. Since there is no backflow, there are excellent effects such as no leakage from the gap between the dampers 10 through the air supply path 9. Moreover, the fluidized combustion air supply device of the present invention provides a small-diameter return pipe for fluidized combustion air having an on-off valve on the exit side of the damper of the fluidized combustion air supply path, and connects this to the fluidized combustion air supply path. By simply connecting it to the upstream side of a forced air blower, it not only provides the excellent functions and effects described above, but also can be easily adopted in existing fluidized bed combustion furnaces, has low equipment costs, and is easy to handle. It also has the advantage of being easy to apply.
第１図は流動床燃焼炉に於ける従来の流動燃焼
用空気供給装置の概略系統図、第２図は本考案の
流動燃焼用空気供給装置の概略系統図である。
１……流動床燃焼炉、２……流動層、２′……
固定層、３……伝熱管、４……ウインドボツク
ス、５……隔壁、６……空気ノズル、７……燃料
供給路、８……流動燃焼用空気供給装置、９……
空気供給路、１０……ダンパ、１１……押込送風
機、１２……空気予熱器、１３……熱風炉、１４
……下部炉床、１５……小口径の戻り管、１６…
…開閉弁、１７……戻り管。
FIG. 1 is a schematic system diagram of a conventional fluidized combustion air supply system in a fluidized bed combustion furnace, and FIG. 2 is a schematic system diagram of the fluidized combustion air supply system of the present invention. 1...Fluidized bed combustion furnace, 2...Fluidized bed, 2'...
Fixed bed, 3... Heat transfer tube, 4... Wind box, 5... Partition wall, 6... Air nozzle, 7... Fuel supply path, 8... Air supply device for fluidized combustion, 9...
Air supply path, 10... Damper, 11... Forced blower, 12... Air preheater, 13... Hot air stove, 14
...Lower hearth, 15...Small diameter return pipe, 16...
...Opening/closing valve, 17...Return pipe.
Claims (1)
燃焼炉に於いて、各ウインドボツクスに連なる流
動燃焼用空気供給路のダンパの出口側に、夫々流
動燃焼用空気の小口径の戻り管を設け、各戻り管
は入口に開閉弁を設けると共に１本の戻り管を介
して流動燃焼用空気供給路の押込送風機の上流側
に接続したことを特徴とする流動床燃焼炉に於け
る流動燃焼用空気供給装置。 In a fluidized bed combustion furnace in which the wind box is divided into at least two parts, a small-diameter return pipe for the fluidized combustion air is provided on the exit side of the damper of the fluidized combustion air supply path connected to each wind box, and each An air supply device for fluidized combustion in a fluidized bed combustion furnace, characterized in that the pipe is provided with an on-off valve at its inlet and is connected to the upstream side of a forced air blower in a fluidized combustion air supply path via one return pipe. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15362981U JPS5858211U (en) | 1981-10-16 | 1981-10-16 | Air supply device for fluidized combustion in a fluidized bed combustion furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15362981U JPS5858211U (en) | 1981-10-16 | 1981-10-16 | Air supply device for fluidized combustion in a fluidized bed combustion furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5858211U JPS5858211U (en) | 1983-04-20 |
| JPH0113209Y2 true JPH0113209Y2 (en) | 1989-04-18 |
Family
ID=29946241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15362981U Granted JPS5858211U (en) | 1981-10-16 | 1981-10-16 | Air supply device for fluidized combustion in a fluidized bed combustion furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5858211U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51101234A (en) * | 1975-03-04 | 1976-09-07 | Inoe Setsukei Kogyo Kk | NOONRIIKUBARUBU |
-
1981
- 1981-10-16 JP JP15362981U patent/JPS5858211U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51101234A (en) * | 1975-03-04 | 1976-09-07 | Inoe Setsukei Kogyo Kk | NOONRIIKUBARUBU |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5858211U (en) | 1983-04-20 |
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