JPS6222045B2 - - Google Patents
Info
- Publication number
- JPS6222045B2 JPS6222045B2 JP53001943A JP194378A JPS6222045B2 JP S6222045 B2 JPS6222045 B2 JP S6222045B2 JP 53001943 A JP53001943 A JP 53001943A JP 194378 A JP194378 A JP 194378A JP S6222045 B2 JPS6222045 B2 JP S6222045B2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- vent gas
- air
- pulverizer
- combustion
- 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
- 239000003245 coal Substances 0.000 claims description 65
- 238000002485 combustion reaction Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Description
【発明の詳細な説明】
本発明は微粉炭輸送用のガス（ベントガス）の
処理方法に関し、より詳しくは、微粉炭燃焼装置
のうち、微粉炭貯蔵型燃焼装置におけるべントガ
スの処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating gas (vent gas) for transporting pulverized coal, and more particularly to a method for treating vent gas in a pulverized coal storage type combustion device among pulverized coal combustion devices.
微粉炭燃焼装置のうち微粉炭貯蔵型の燃焼装置
にあつては、原炭を微粉炭機で粉砕し、加熱した
空気をこの微粉炭機に送入して石炭中の水分を蒸
発させると同時に、加熱空気の流通を利用して微
粉炭機から粉砕した微粉炭を排出輸送し、さらに
分離器で微粉炭と前記の乾燥および輸送に用いた
空気とを分離していた。しかしこの分離した空気
の中には分離器の効率上0.05〜0.3％程度の微粉
炭を含むことは避けられない。 Among pulverized coal combustion equipment, in the case of pulverized coal storage type combustion equipment, raw coal is pulverized in a pulverizer, and heated air is fed into the pulverizer to evaporate moisture in the coal. The pulverized coal was discharged and transported from a pulverizer using heated air circulation, and the pulverized coal was further separated from the air used for drying and transportation using a separator. However, this separated air inevitably contains about 0.05 to 0.3% of pulverized coal due to the efficiency of the separator.
従来、微粉炭の輸送を完了したベンドガスはフ
イルタを通して大気に放出するか、またはボイラ
火炉開口部から火炉に入れられ燃焼処理されてい
た。しかしながら大気中に放出する方法ではフイ
ルタで完全に微粉炭を処理することが不可能であ
るため大気を汚染し、他方火炉で燃焼処理する方
法ではボイラの空気制御や燃焼を乱すことにな
る。すなわち微粉炭機は微粉炭貯槽の能力に応じ
て作動し、ボイラの負荷に関係なく作動するた
め、この方法では空気の過剰供給などの不都合が
生ずるのである。この火炉に入れて燃焼処理する
方法を第１図に基づいてさらに具体的に説明す
る。第１図は従来の燃焼装置を示し、燃焼用空気
フアン８から供給された空気の一部は空気予熱器
９を通過し加熱され、熱空気ダクト１２を経て微
粉炭機１内の微粉炭を乾燥させるとともにこの微
粉炭を微粉炭機１から搬出する。分離器２に到達
した空気は微粉炭と分離され、ベントフアン４に
よりベントガス管１５を経てベントガス処理口１
６から火炉７内に送入され燃焼処理される。第１
図に示した従来の方法ではベントガスは微粉炭機
１の作動に対応してボイラに送入されるだけで、
燃焼用空気としての制御は全く行われていない。
このためベントガスの処理中には必要以上の空気
がボイラに供給され、空気供給率過剰でボイラを
運転することになり、NOx発生その他の燃焼制
御上の問題を生ずる。 Conventionally, the bent gas after transporting the pulverized coal was either discharged into the atmosphere through a filter or put into a furnace through the boiler furnace opening and burned. However, in the method of discharging pulverized coal into the atmosphere, it is impossible to completely process the pulverized coal with a filter, which pollutes the atmosphere.On the other hand, in the method of combustion in a furnace, the air control and combustion of the boiler are disturbed. That is, since the pulverizer operates according to the capacity of the pulverized coal storage tank and is operated regardless of the load on the boiler, this method causes problems such as excessive supply of air. The method of putting the material into the furnace and performing combustion treatment will be explained in more detail based on FIG. FIG. 1 shows a conventional combustion device, in which a part of the air supplied from a combustion air fan 8 passes through an air preheater 9, is heated, and passes through a hot air duct 12 to pulverized coal in a pulverizer 1. While drying, this pulverized coal is carried out from the pulverized coal machine 1. The air that has reached the separator 2 is separated from the pulverized coal, and is passed through the vent gas pipe 15 by the vent fan 4 to the vent gas processing port 1.
6 into a furnace 7 where it is burned. 1st
In the conventional method shown in the figure, vent gas is simply sent to the boiler in response to the operation of the coal pulverizer 1.
The combustion air is not controlled at all.
For this reason, more air than necessary is supplied to the boiler during vent gas processing, resulting in the boiler being operated at an excessive air supply rate, resulting in NOx generation and other combustion control problems.
本発明は上記従来技術の欠点を除去し、微粉炭
と分離したベントガスを直接焼却処理せず、微粉
炭輸送用および一次空気として利用しベントガス
中の微粉炭を燃焼させる一方、ベントガスの一部
を微粉炭機に回送することにより残存の微粉炭を
回収し、火炉に対し空気供給が過剰になることが
ないベントガスの処理方法を提供することを目的
とする。 The present invention eliminates the drawbacks of the above-mentioned prior art, does not directly incinerate the vent gas separated from the pulverized coal, and uses it for transporting the pulverized coal and as primary air to burn the pulverized coal in the vent gas, while also burning a part of the vent gas. An object of the present invention is to provide a vent gas processing method that recovers residual pulverized coal by sending it to a pulverizer and does not cause excessive air supply to the furnace.
要するに本発明は、微粉炭機より送出される微
粉炭を気流輸送し、分離器で分離し微粉炭貯蔵槽
に供給し、未分離の微粉炭を含む前記分離器より
のベントガスを、前記微粉炭貯蔵槽から送出され
る微粉炭をバーナへ気流輸送する一次空気に混入
するようにした微粉炭貯蔵型燃焼装置のベントガ
ス処理方法である。 In short, the present invention pneumatically transports pulverized coal sent out from a pulverized coal machine, separates it in a separator, and supplies it to a pulverized coal storage tank, and vent gas from the separator containing unseparated pulverized coal to the pulverized coal. This is a vent gas treatment method for a pulverized coal storage type combustion apparatus in which pulverized coal sent out from a storage tank is mixed into primary air that is airflow-transported to a burner.
次に本発明の一実施例を第２図に基いて説明す
る。原炭入口管１４から供給された石炭は微粉炭
機１において粉砕され微粉炭とされる。一方微粉
炭輸送用の空気は燃焼用空気フアン８により供給
され、空気予熱器９により加熱され、その一部は
二次空気として風箱１１に供給され、残余の加熱
された空気は管路１２を流れ、管路１３を流れる
冷空気と合流して微粉炭機１に導かれ、微粉炭を
乾燥するとともに微粉炭を微粉炭機１から搬出
し、分離器２へ輸送する。分離器２に達したベン
トガスは微粉炭と分離され、ロータリフイーダ２
ａを経由し分離した微粉炭は微粉炭貯蔵槽３に貯
えられる。微粉炭を分離したあとのベントガスは
ベントガスフアン４に送られる。ベントガスフア
ン４を出たベントガスはベントガス管１５を経
て、その一部はベントガス予熱器１９に入り加熱
され、ベントガス管１７を経て一次空気フアン１
０に達する。 Next, one embodiment of the present invention will be described based on FIG. Coal supplied from the raw coal inlet pipe 14 is pulverized by the pulverizer 1 into pulverized coal. On the other hand, air for transporting pulverized coal is supplied by a combustion air fan 8, heated by an air preheater 9, a part of which is supplied as secondary air to a wind box 11, and the remaining heated air is sent to a pipe 12. The pulverized coal flows through the pulverizer 1, joins with the cold air flowing through the pipe 13, and is guided to the pulverizer 1, where the pulverized coal is dried, carried out from the pulverizer 1, and transported to the separator 2. The vent gas that has reached the separator 2 is separated from the pulverized coal and sent to the rotary feeder 2.
The pulverized coal separated via a is stored in a pulverized coal storage tank 3. The vent gas after separating the pulverized coal is sent to the vent gas fan 4. The vent gas exiting the vent gas fan 4 passes through the vent gas pipe 15, a part of which enters the vent gas preheater 19 and is heated, and passes through the vent gas pipe 17 to the primary air fan 1.
reaches 0.
一次空気フアン１０を出たベントガスは管路１
０ａに入り、微粉炭貯蔵槽３の下部で微粉炭供給
量制御機たるロータリフイーダ２ｂから微粉炭の
供給を受け、ベントガスを含む一次空気の一部と
して微粉炭をバーナノズル６に送ることに使用さ
れ空気輸送された微粉炭は火炉７内で燃焼する。
５はバーナノズル６の附近に設けたエアレジスタ
である。一方ベントガス管１８に入つたベントガ
スは冷空気ダクト１３に入り、微粉炭機１に回送
され、該微粉炭機１の出口温度制御用の冷空気と
して利用される。微粉炭機１を運転していないと
きは、熱空気ダクト１２および冷空気ダクト１３
からの空気は合流し一次空気フアン１０を経て微
粉炭の輸送および一次空気として用いられる。ま
た、微粉炭機１に用いられる空気量と管路１０ａ
を流れる空気量との比率は、最低負荷運用時に微
粉炭搬送用空気流速を考慮する微粉炭機運転条件
を最低にして１：0.9（通常は１：1.2）となる。
これはベントガスが10％余分にあることを意味
し、この余分のベントガスは熱空気としてベント
ガス予熱器１９で再加熱して管路１２に供給し使
用する。このベントガス予熱器１９の容量は、燃
焼装置系統の使用空気量の10％程度の小形容量の
ものでよい。以上の実施例ではベントガスを一次
空気と微粉炭機１に対する冷空気の両方に利用し
たが、ベントガス予熱系統を除外して、ベントガ
ス予熱器へ行くべきベントガスを別に管路（図示
せず）を設けておき直接火炉に導いても良い。こ
の場合、ベントガスの一部は管路１３径由一次空
気フアンに供給し一次空気として利用されるため
火炉へ導入するベントガス量は少く空気の過剰供
給は生じない。さらには二段燃焼方式を採用した
装置の二段燃焼ポート、もしくはバーナノズル廻
りにベントガスを送入してもよい。 The vent gas leaving the primary air fan 10 is piped into the pipe 1.
0a, receives the supply of pulverized coal from the rotary feeder 2b which is a pulverized coal supply amount control device at the lower part of the pulverized coal storage tank 3, and is used to send the pulverized coal to the burner nozzle 6 as part of the primary air containing vent gas. The pulverized coal that has been pneumatically transported is burned in the furnace 7.
5 is an air register provided near the burner nozzle 6. On the other hand, the vent gas that has entered the vent gas pipe 18 enters the cold air duct 13, is sent to the pulverizer 1, and is used as cold air for controlling the outlet temperature of the pulverizer 1. When the pulverizer 1 is not operating, the hot air duct 12 and the cold air duct 13
The air from the pulverized coal is combined and passed through the primary air fan 10 to be used for transporting pulverized coal and as primary air. In addition, the amount of air used in the pulverizer 1 and the pipe line 10a
The ratio to the amount of air flowing through the pulverizer is 1:0.9 (usually 1:1.2) when the pulverizer operating conditions are set to the minimum, taking into account the air flow rate for pulverized coal conveyance during the lowest load operation.
This means that there is 10% extra vent gas, and this extra vent gas is reheated as hot air in the vent gas preheater 19 and supplied to the pipe line 12 for use. The capacity of the vent gas preheater 19 may be small, about 10% of the amount of air used in the combustion system. In the above embodiment, vent gas was used as both primary air and cold air for the pulverizer 1, but the vent gas preheating system was excluded and a separate pipe line (not shown) was provided for the vent gas to be sent to the vent gas preheater. You can also leave it there and lead it directly to the furnace. In this case, a part of the vent gas is supplied to the primary air fan through the pipe line 13 and used as primary air, so the amount of vent gas introduced into the furnace is small and no excessive supply of air occurs. Furthermore, the vent gas may be introduced into a two-stage combustion port of an apparatus employing a two-stage combustion method or around a burner nozzle.
本発明によれば、微粉炭との分離を終つたベン
トガスを直接火炉に送らないか、または直接火炉
に送る場合でも極く小量を送るにすぎないためボ
イラに対して過剰な空気を供給することがなく、
ボイラの効率を向上させることができかつベント
ガスに含まれる超微粉炭を全部燃焼させ良好な着
火性を保持することとなり、しかも大気汚染など
の公害が生ずることがない。 According to the present invention, the vent gas that has been separated from the pulverized coal is not sent directly to the furnace, or even if it is sent directly to the furnace, only a very small amount is sent, so that excess air is supplied to the boiler. Without a problem,
The efficiency of the boiler can be improved, all of the ultrafine coal contained in the vent gas is combusted, and good ignitability is maintained, and no pollution such as air pollution is caused.
またバーナ６へ燃料を供給する管路１０ａへの
微粉炭供給量の制御はロータリフイーダ２ｂの回
転数の制御でできるもので微粉炭機の微粉炭供給
能力に関係しないことは、燃焼装置の負荷への応
答を敏速適切にすることを可能とし、また微粉炭
機故障の場合でも微粉炭貯槽の容量に応じてある
時間バーナの燃焼を継続することができるもので
ある。またベントガス処理口など火炉に特別な措
置を施す必要がなく、またボイラの運転を安定さ
せることができる。 Furthermore, the amount of pulverized coal supplied to the pipe line 10a that supplies fuel to the burner 6 can be controlled by controlling the rotation speed of the rotary feeder 2b, and is not related to the pulverized coal supply capacity of the pulverized coal machine. It is possible to quickly and appropriately respond to the load, and even in the event of a failure of the pulverizer, the burner can continue combustion for a certain period of time depending on the capacity of the pulverized coal storage tank. Further, there is no need to take any special measures on the furnace such as a vent gas treatment port, and the boiler operation can be stabilized.
第１図は従来の燃焼装置の系統を示す概略図で
あり、第２図は本発明に係るベントガス処理系統
を有する燃焼装置の系統を示す概略図である。
１……微粉炭機、２……分離器、２ｂ……微粉
炭供給器（ロータリフイーダ）、３……微粉炭貯
蔵槽、４……ベントガスフアン、５……エアレジ
スタ、６……バーナノズル、７……火炉、８……
燃焼用空気フアン、９……空気予熱器、１０……
一次空気フアン、１１……風箱、１２……熱空気
ダクト、１３……冷空気ダクト、１４……原炭入
口管、１５，１７，１８……ベントガス管、１６
……ベントガス処理口、１９……ベントガス予熱
器。
FIG. 1 is a schematic diagram showing a conventional combustion apparatus system, and FIG. 2 is a schematic diagram showing a combustion apparatus system having a vent gas treatment system according to the present invention. 1...pulverized coal machine, 2...separator, 2b...pulverized coal feeder (rotary feeder), 3...pulverized coal storage tank, 4...vent gas fan, 5...air register, 6...burner nozzle , 7... Furnace, 8...
Combustion air fan, 9... Air preheater, 10...
Primary air fan, 11... Wind box, 12... Hot air duct, 13... Cold air duct, 14... Raw coal inlet pipe, 15, 17, 18... Vent gas pipe, 16
...Vent gas processing port, 19...Vent gas preheater.
Claims (1)
し、分離器で分離し微粉炭貯蔵槽に供給し、未分
離の微粉炭を含む前記分離器よりのベントガス
を、前記微粉炭貯蔵槽から送出される微粉炭をバ
ーナへ気流輸送する一次空気に混入するようにし
たことを特徴とする微粉炭貯蔵型燃焼装置のベン
トガス処理方法。1 The pulverized coal sent out from the pulverized coal machine is transported by pneumatic flow, separated by a separator and supplied to a pulverized coal storage tank, and the vent gas from the separator containing unseparated pulverized coal is sent out from the pulverized coal storage tank. 1. A vent gas treatment method for a pulverized coal storage type combustion apparatus, characterized in that pulverized coal is mixed into primary air that is airflow-transported to a burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP194378A JPS5495024A (en) | 1978-01-13 | 1978-01-13 | Vent air treating process in particle coal storage type combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP194378A JPS5495024A (en) | 1978-01-13 | 1978-01-13 | Vent air treating process in particle coal storage type combustion system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5495024A JPS5495024A (en) | 1979-07-27 |
| JPS6222045B2 true JPS6222045B2 (en) | 1987-05-15 |
Family
ID=11515688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP194378A Granted JPS5495024A (en) | 1978-01-13 | 1978-01-13 | Vent air treating process in particle coal storage type combustion system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5495024A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5749728A (en) * | 1980-09-08 | 1982-03-23 | Onoda Cement Co Ltd | Pulverized coal combustion device |
| JP6280857B2 (en) * | 2014-11-17 | 2018-02-14 | 三菱日立パワーシステムズ株式会社 | boiler |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4877422A (en) * | 1972-01-18 | 1973-10-18 |
-
1978
- 1978-01-13 JP JP194378A patent/JPS5495024A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4877422A (en) * | 1972-01-18 | 1973-10-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5495024A (en) | 1979-07-27 |
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