JP2708106B2 - Pulverized coal combustion equipment - Google Patents
Pulverized coal combustion equipmentInfo
- Publication number
- JP2708106B2 JP2708106B2 JP1126584A JP12658489A JP2708106B2 JP 2708106 B2 JP2708106 B2 JP 2708106B2 JP 1126584 A JP1126584 A JP 1126584A JP 12658489 A JP12658489 A JP 12658489A JP 2708106 B2 JP2708106 B2 JP 2708106B2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- preheated air
- air
- machine
- coal 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 - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
- Feeding And Controlling Fuel (AREA)
- Combustion Of Fluid Fuel (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は微粉炭燃焼システムに係り、特に熱効率を低
下させることなく、微粉炭を供給する微粉炭機を予熱空
気ラインから完全、かつ安全に隔離するのに好適な構造
を有する微粉炭燃焼装置に関する。The present invention relates to a pulverized coal combustion system, and more particularly to a pulverized coal machine for supplying pulverized coal completely and safely from a preheated air line without reducing thermal efficiency. The present invention relates to a pulverized coal combustion device having a structure suitable for isolation.
従来の石炭を粉砕し微粉炭を供給する微粉炭機を備え
た微粉炭燃焼装置において、例えばメンテナンス時に微
粉炭機を予熱空気ラインから隔離させる場合に、第３図
に示すごとく、二重ダンパ４を遮断することにより、微
粉炭機６の隔離を行っていた。しかし、二重ダンパ４の
みでの遮断ではダンパのシール部から予熱空気の漏洩が
あり、完全に隔離することができなかった。In a conventional pulverized coal combustion apparatus provided with a pulverized coal machine that pulverizes coal and supplies pulverized coal, for example, when the pulverized coal machine is separated from the preheating air line during maintenance, as shown in FIG. , The pulverized coal machine 6 was isolated. However, when the double damper 4 was cut off only, the preheated air leaked from the seal portion of the damper, so that complete isolation could not be achieved.
他方、第４図に示されるように、二重ダンパ４による
遮断装置の中間部に、エアベント11を設けて微粉炭機６
の隔離を行い、ダンパのシール部からの予熱空気の漏洩
はエアベント11から大気へ放出させていたために、漏洩
する予熱空気（約200〜300℃）の熱回収ができず、また
安全性についての配慮は全くなされていなかった。On the other hand, as shown in FIG. 4, an air vent 11 is provided in the middle of the shutoff device by the double damper 4 to
The preheated air leaked from the seal part of the damper was released to the atmosphere from the air vent 11, so the leaked preheated air (about 200 to 300 ° C) could not be recovered, and the safety No consideration was given.
上述したごとく、従来技術においては、微粉炭を供給
する微粉炭機を予熱空気ラインから隔離し、かつ漏洩す
る約200〜300℃の予熱空気の熱回収および安全性を確保
する点についての配慮が全くなく、微粉炭燃焼装置の熱
効率の低下および装置の安全性について問題があった。As described above, in the prior art, the pulverized coal machine that supplies the pulverized coal is separated from the preheated air line, and consideration is given to heat recovery of the leaked preheated air of about 200 to 300 ° C and to ensure safety. Absent, there was a problem with the reduction in thermal efficiency of the pulverized coal combustion device and the safety of the device.
本発明の目的は、上記従来技術の問題点を解消し、石
炭を粉砕しながら微粉炭をバーナに供給して燃焼させる
微粉炭機を備えた微粉炭燃焼装置のメンテナンス時にお
いて、上記微粉炭機を予熱空気ラインからほぼ完全に隔
離し、かつ漏洩する予熱空気を外気に放出させることな
く、効果的に回収できる熱効率ならびに安全性の高い構
造を有する微粉炭燃焼装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and perform maintenance on a pulverized coal combustion apparatus provided with a pulverized coal combustion apparatus that supplies pulverized coal to a burner while pulverizing coal, and burns the pulverized coal. Of the present invention is to provide a pulverized coal combustion apparatus having a structure with high thermal efficiency and high safety that can be effectively recovered without almost completely isolating the preheated air from the preheated air line and releasing the leaked preheated air to the outside air.
上記本発明の目的は、石炭を粉砕しながら微粉炭を供
給し燃焼させる微粉炭機を備えた微粉炭燃焼装置におい
て、予熱空気ラインに設けられている微粉炭機を隔離す
るために設けられている二重ダンパのダンパとダンパと
の中間部位に、上記二重ダンパから漏洩する予熱空気
を、空気予熱器に燃焼用空気を送入する押込通風機の入
口側および微粉炭燃焼装置のウインドボックスのうちの
いずれか一方もしくは両方に導入する熱回収ベントライ
ンを設けることにより達成できる。これにより、漏洩す
る予熱空気の熱回収と微粉炭機のメンテナンスが容易と
なり、かつ安全性を確保することができる。The object of the present invention is to provide a pulverized coal combustion apparatus having a pulverized coal machine that supplies and burns pulverized coal while pulverizing coal, provided to isolate the pulverized coal machine provided in the preheating air line. In the intermediate part between the dampers of the double damper, the preheated air leaking from the double damper is fed into the air preheater at the inlet side of a forced draft fan and the wind box of the pulverized coal combustion device. This can be achieved by providing a heat recovery vent line that is introduced into one or both of the above. Thereby, heat recovery of the leaking preheated air and maintenance of the pulverized coal machine become easy, and safety can be ensured.
本発明は、石炭を粉砕し微粉炭を生成する微粉炭機
と、該微粉炭機で生成した微粉炭を予熱空気によってバ
ーナへ搬送し燃焼させる予熱空気供給ラインを有する微
粉炭燃焼装置において、上記予熱空気供給ラインに、予
熱空気を遮断し微粉炭機を隔離するための遮断装置を所
定の間隔で２箇所に設置し、上記２箇所に設置した遮断
装置の中間部位に、上記遮断装置から漏洩する予熱空気
を、上記予熱用空気を送入する押込通風機の入口側およ
び上記バーナのウインドボックスのうちのいずれか一方
もしくは両方に導入する熱回収ベントラインを設けた微
粉炭燃焼装置である。The present invention relates to a pulverized coal combustion device having a pulverized coal machine that pulverizes coal to produce pulverized coal, and a preheated air supply line that transports and burns the pulverized coal generated by the pulverized coal machine to a burner with preheated air. In the preheated air supply line, shutoff devices for shutting off the preheated air and isolating the pulverized coal machine are installed at two places at predetermined intervals, and leakage from the shutoff device to an intermediate portion of the shutoff devices installed at the two places. A pulverized coal combustion device provided with a heat recovery vent line for introducing preheated air to one or both of an inlet side of a forced draft fan for feeding the preheating air and a wind box of the burner.
予熱空気を二重に遮断する二重ダンパのダンパとダン
パとの間にリークした予熱空気は、熱回収ベントライン
中に選択的に流入し、ライン圧力の低い押込通風機の入
口側あるいはウインドボックスに送入される。これによ
って、二重遮断装置（二重ダンパ）の後流側への熱空気
のリークはほぼ完全に遮断され、かつ予熱空気は系内に
回収されるので、予熱空気の微粉炭機に対する遮断が不
十分になったり、また微粉炭燃焼装置の熱効率が低下す
ることはない。The preheated air leaked between the damper of the double damper that double blocks the preheated air flows selectively into the heat recovery vent line, and the inlet side of the forced air ventilator with low line pressure or the wind box Will be sent to As a result, the leakage of hot air to the downstream side of the double shut-off device (double damper) is almost completely shut off, and the preheated air is recovered in the system. It does not become insufficient or the thermal efficiency of the pulverized coal combustion device decreases.
以下に本発明の一実施例を挙げ、図面に基づいてさら
に詳細に説明する。Hereinafter, an embodiment of the present invention will be described in more detail with reference to the drawings.
第１図に示すごとく、一次通風機２にて加圧された空
気は、空気予熱器３を通過し、200〜300℃に予熱され
る。この予熱空気は、各微粉炭機6a,6b,6cに分配され、
微粉炭機6a,6b,6cで粉砕された微粉炭を空気搬送し、バ
ーナ10に供給され、ボイラ火炉７内で燃焼される。As shown in FIG. 1, the air pressurized by the primary ventilator 2 passes through an air preheater 3 and is preheated to 200 to 300 ° C. This preheated air is distributed to each pulverized coal machine 6a, 6b, 6c,
The pulverized coal pulverized by the pulverized coal machines 6a, 6b, 6c is conveyed by air, supplied to the burner 10, and burned in the boiler furnace 7.
各微粉炭機6a,6b,6cの入口には、他の微粉炭機6b,6c
から微粉炭機6aを隔離するために二重ダンパ４が設置さ
れ、その中間部位から熱回収ベントライン5aが押込通風
機１の入口側に連結されている。At the inlet of each pulverized coal machine 6a, 6b, 6c, other pulverized coal machine 6b, 6c
A double damper 4 is installed to isolate the pulverized coal machine 6a from the heat exchanger, and a heat recovery vent line 5a is connected to the inlet side of the forced draft fan 1 from an intermediate portion thereof.
したがって、微粉炭機6aを予熱空気ラインから切離し
てメンテナンスする場合に、二重ダンパ４のシール部か
ら予熱空気の漏洩があっても、予熱空気は熱回収ベント
ライン5aを経由して押込通風機１の入口側へ流入し、ウ
インドボックス９から燃焼用空気として再利用すること
ができるので、リークする予熱空気を排熱が回収でき、
熱効率の向上をはかることができる。二重ダンパ４の閉
鎖時には、ダンパ４の入口側の圧力は約800mm水柱で、
二重ダンパ４の出口側は大気圧に開放されるため、ダン
パ４の入口部と出口部では約800mm水柱の圧力差が生じ
る。このため、加圧された予熱空気の一部は、二重ダン
パ４の中間部にリークするが、このリークした予熱空気
は、熱回収ベントライン5aから大気圧以下（約−50mm水
柱）の押込通風機１の入口部に選択的に流入して行き、
二重ダンパ４の後流側への予熱空気のリークを防ぐこと
ができる。また、リークした予熱空気は、押込通風機１
を通過し、他の空気流と混合され、ボイラ火炉系内のウ
インドボックス９に戻り熱回収されるので、ボイラ効率
の低下を防止することができる。Therefore, when the pulverized coal machine 6a is separated from the preheated air line for maintenance, even if the preheated air leaks from the seal portion of the double damper 4, the preheated air is forced through the heat recovery vent line 5a. 1 and can be reused as combustion air from the wind box 9, so that the leaked preheated air can be recovered as waste heat.
Thermal efficiency can be improved. When the double damper 4 is closed, the pressure on the inlet side of the damper 4 is about 800 mm water column,
Since the outlet side of the double damper 4 is opened to the atmospheric pressure, a pressure difference of about 800 mm water column occurs between the inlet and the outlet of the damper 4. For this reason, a part of the pressurized preheated air leaks into the middle part of the double damper 4, and the leaked preheated air is pushed into the heat recovery vent line 5a under the atmospheric pressure (about −50 mm water column). It selectively flows into the inlet of the ventilator 1,
Leakage of preheated air to the downstream side of the double damper 4 can be prevented. The leaked preheated air is supplied to the forced air
, Is mixed with another air flow, and is returned to the wind box 9 in the boiler furnace system to recover heat, so that a decrease in boiler efficiency can be prevented.
次に、本発明の他の実施例を第２図に示す。本実施例
は、熱回収ベントライン5bの連絡先をライン圧力が低い
ウインドボックス９へ連結させたものである。Next, another embodiment of the present invention is shown in FIG. In this embodiment, the contact point of the heat recovery vent line 5b is connected to a wind box 9 having a low line pressure.
以上詳細に説明したごとく本発明の微粉炭燃焼装置に
よれば、微粉炭機の予熱空気ラインからの完全な隔離お
よび漏洩する予熱空気の熱回収ができるので、漏洩予熱
空気の処理設備が省略でき、かつ微粉炭燃焼装置の熱効
率の低下を防止することができる。As described in detail above, according to the pulverized coal combustion apparatus of the present invention, since complete isolation from the preheated air line of the pulverized coal machine and heat recovery of the leaked preheated air can be performed, the treatment equipment for the leaked preheated air can be omitted. In addition, a decrease in the thermal efficiency of the pulverized coal combustion device can be prevented.
また、微粉炭機メインテナンスの時に、二重ダンパで
遮断して予熱空気から隔離するが、従来の微粉炭燃焼装
置では、約１％程度の予熱空気のリークがあるため、微
粉炭機の冷却用期間は約２日を要していたが、本発明の
微粉炭燃焼装置によれば、半日以下で微粉炭機の冷却が
可能となりメインテナンスを行うことができる。さら
に、耐熱設備が不要となり、かつメインテナンス費用を
大幅に低減できる効果がある。Also, during maintenance of the pulverized coal machine, it is shut off by a double damper to isolate it from preheated air. However, in the conventional pulverized coal combustion device, about 1% of preheated air leaks. Although the period required about 2 days, according to the pulverized coal combustion apparatus of the present invention, the pulverized coal machine can be cooled in less than half a day, and maintenance can be performed. Further, there is an effect that heat-resistant equipment is not required and maintenance costs can be significantly reduced.
第１図は本発明の実施例において例示した微粉炭機を予
熱空気ラインから隔離するシステムを示す系統図、第２
図は本発明の他の実施例を示す系統図、第３図および第
４図は従来の微粉炭燃焼システムにおける微粉炭機の隔
離を示す系統図である。 １……押込通風機、２……一次通風機 ３……空気予熱器、４……二重ダンパ 5,5a,5b……熱回収ベントライン 6,6a,6b,6c……微粉炭機 ７……ボイラ火炉、８……誘引通風機 ９……ウインドボックス 10……バーナ、11……エアベントFIG. 1 is a system diagram showing a system for isolating a pulverized coal machine illustrated in an embodiment of the present invention from a preheated air line.
FIG. 3 is a system diagram showing another embodiment of the present invention, and FIGS. 3 and 4 are system diagrams showing isolation of a pulverized coal machine in a conventional pulverized coal combustion system. 1… Insert ventilator, 2… Primary ventilator 3 …… Air preheater, 4… Dual damper 5,5a, 5b… Heat recovery vent line 6,6a, 6b, 6c… Pulverized coal machine 7 …… Boiler furnace, 8… Induced draft fan 9 …… Wind box 10 …… Burner, 11 …… Air vent
Claims (1)
と、該微粉炭機で生成した微粉炭を予熱空気によってバ
ーナへ搬送し燃焼させる予熱空気供給ラインを有する微
粉炭燃焼装置において、上記予熱空気供給ラインに、予
熱空気を遮断し微粉炭機を隔離するための遮断装置を所
定の間隔で２箇所に設置し、上記２箇所に設置した遮断
装置の中間部位に、上記遮断装置から漏洩する予熱空気
を、上記予熱用空気を送入する押込通風機の入口側およ
び上記バーナのウインドボックスのうちのいずれか一方
もしくは両方に導入する熱回収ベントラインを設けたこ
とを特徴とする微粉炭燃焼装置。1. A pulverized coal combustion apparatus having a pulverized coal machine for pulverizing coal to produce pulverized coal, and a preheated air supply line for conveying pulverized coal generated by the pulverized coal machine to a burner by preheated air and burning it. In the preheated air supply line, shutoff devices for shutting off the preheated air and isolating the pulverized coal machine are installed at two places at predetermined intervals, and the shutoff devices are installed at an intermediate portion of the shutoff devices installed at the two places. Fine powder characterized by having a heat recovery vent line for introducing the leaking preheated air into one or both of the inlet side of the push-in ventilator for feeding the preheating air and the wind box of the burner. Charcoal combustion device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1126584A JP2708106B2 (en) | 1989-05-22 | 1989-05-22 | Pulverized coal combustion equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1126584A JP2708106B2 (en) | 1989-05-22 | 1989-05-22 | Pulverized coal combustion equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02306003A JPH02306003A (en) | 1990-12-19 |
| JP2708106B2 true JP2708106B2 (en) | 1998-02-04 |
Family
ID=14938795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1126584A Expired - Fee Related JP2708106B2 (en) | 1989-05-22 | 1989-05-22 | Pulverized coal combustion equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2708106B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5137598B2 (en) * | 2008-01-23 | 2013-02-06 | 中国電力株式会社 | Ventilation system in steam power generation facilities |
-
1989
- 1989-05-22 JP JP1126584A patent/JP2708106B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02306003A (en) | 1990-12-19 |
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