JP2009243874A - Boiler and its operating method - Google Patents

Boiler and its operating method Download PDF

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JP2009243874A
JP2009243874A JP2009053539A JP2009053539A JP2009243874A JP 2009243874 A JP2009243874 A JP 2009243874A JP 2009053539 A JP2009053539 A JP 2009053539A JP 2009053539 A JP2009053539 A JP 2009053539A JP 2009243874 A JP2009243874 A JP 2009243874A
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boiler
ash
exhaust gas
air
combustion air
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JP5293956B2 (en
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Tomohiro Okumura
知洋 奥村
Fumihiko Tamamushi
文彦 玉蟲
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IHI Corp
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IHI Corp
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Priority to DE112009000570T priority patent/DE112009000570B4/en
Priority to PCT/JP2009/054437 priority patent/WO2009113498A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F23L15/02—Arrangements of regenerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
    • F23L2900/15041—Preheating combustion air by recuperating heat from ashes
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Supply (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Gasification And Melting Of Waste (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide boiler and itss operating method, providing efficiency improvement of a regenerative air pre-heater for preheating outside air and feeding the air as combustion air to a boiler. <P>SOLUTION: The boiler equipment is provided with: a coal fired boiler 1; the regenerative air pre-heater 2 equipped with a heat transfer section 2a for preheating air A1 from the outside and feeding the preheated air A1 as combustion air A2 to the coal fired boiler 1; and a dry clinker conveyor 3 for conveying ash B discharged from the coal fired boiler 1 while cooling the ash B with cooling air A4 introduced from the external, and is further provided with a bypass 13 for feeding a part of the combustion air A2 being fed from the regenerative air pre-heater 2 to the coal fired boiler 1 as cooling medium A6 to the dry clinker conveyor 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、石炭焚きボイラ装置などのボイラ装置に係り、特に、ボイラから排出される灰を搬送する灰搬送手段として乾式クリンカコンベアを採用した場合に適したボイラ装置及びその運転方法に関するものである。   The present invention relates to a boiler device such as a coal-fired boiler device, and more particularly to a boiler device suitable for a case where a dry clinker conveyor is employed as an ash conveying means for conveying ash discharged from a boiler, and an operation method thereof. .

従来、上記したようなボイラ装置としては、例えば、ボイラと、伝熱部を具備して外部からの空気を予熱してボイラに燃焼空気として送り込む再生式空気予熱器と、ボイラから排出される灰を載せて搬送するコンベアベルト及びこのコンベアベルトを覆うコンベアフードを具備した乾式クリンカコンベアを備えた石炭焚きボイラ装置がある。
この石炭焚きボイラ装置では、乾式クリンカコンベアのコンベアフードに設けた吸気口を通して外部から冷却空気を導入することで、コンベアベルト上における搬送途中の灰から顕熱を回収すると共に灰中の未燃焼分を燃焼させ、これにより高温となった冷却空気の一部をボイラに戻すようにしている（例えば、特許文献１参照）。 Conventionally, as the above-described boiler device, for example, a boiler, a regenerative air preheater that includes a heat transfer section, preheats air from the outside, and sends it as combustion air to the boiler, and ash discharged from the boiler There is a coal-fired boiler apparatus provided with a dry clinker conveyor provided with a conveyor belt that carries and conveys the conveyor belt and a conveyor hood that covers the conveyor belt.
In this coal-fired boiler device, by introducing cooling air from the outside through the air inlet provided in the conveyor hood of the dry clinker conveyor, sensible heat is recovered from the ash that is being transported on the conveyor belt and unburned components in the ash And a part of the cooling air that has become high temperature is returned to the boiler (see, for example, Patent Document 1).

特開昭63-6319号公報Japanese Unexamined Patent Publication No. 63-6319

ところが、上記した石炭焚きボイラ装置において、ボイラからコンベアベルト上に排出される灰（約８５０℃）を冷やす冷却空気（約１５℃）は、乾式クリンカコンベアのコンベアフードの吸気口を通して全量大気吸込みにより導入され、この大気吸込みにより導入された冷却空気のすべてが、ボイラにおいて燃焼に費やされて該ボイラにおける全燃焼空気量の１％程度を占めることから、その分だけ、再生式空気予熱器において、排ガスと熱交換する空気量を減らすことになって、排ガス温度を一定にするためには、再生式空気予熱器の伝熱面積を増やさざるを得ないのが現状である。   However, in the coal-fired boiler apparatus described above, the cooling air (about 15 ° C.) for cooling the ash (about 850 ° C.) discharged from the boiler onto the conveyor belt is entirely sucked into the air through the intake port of the conveyor hood of the dry clinker conveyor. Since all of the cooling air introduced by the air suction is consumed in the boiler and occupies about 1% of the total combustion air amount in the boiler, the regenerative air preheater is equivalent to that amount. In order to keep the exhaust gas temperature constant by reducing the amount of air that exchanges heat with exhaust gas, the current state is that the heat transfer area of the regenerative air preheater must be increased.

本発明は、上記した課題に着目してなされたもので、外部からの空気を予熱してボイラに燃焼空気として送り込む再生式空気予熱器の効率向上を実現することが可能なボイラ装置及びその運転方法を提供することを目的としている。   The present invention has been made paying attention to the above-described problem, and is a boiler device capable of realizing an improvement in the efficiency of a regenerative air preheater that preheats air from the outside and sends it as combustion air to the boiler, and its operation It aims to provide a method.

本発明は、ボイラと、外部からの空気を予熱する伝熱部が具備された再生式空気予熱器と、前記再生式空気予熱器で予熱された外部からの空気を燃焼空気として前記ボイラに送給する燃焼空気供給系統と、前記ボイラから排気される排ガスを前記再生式空気予熱器に送給する排ガス系統と、前記ボイラから排出される灰を外部から導入される冷却空気により冷却しつつ搬送する灰搬送手段を備えたボイラ装置において、前記燃焼空気供給系統及び排ガス系統のうちの少なくともいずれか一方の系統と、前記ボイラの灰排出部から前記灰搬送手段の搬送終端部に至るまでのいずれかの部位との間には、該系統内の気体を冷却媒体として送給するバイパスが形成されている構成としたことを特徴としており、このボイラ装置の構成を前述した従来の課題を解決するための手段としている。   The present invention relates to a boiler, a regenerative air preheater provided with a heat transfer section for preheating air from the outside, and air from the outside preheated by the regenerative air preheater as combustion air to the boiler. Combustion air supply system for supplying, exhaust gas system for supplying exhaust gas exhausted from the boiler to the regenerative air preheater, and transporting ash discharged from the boiler while being cooled by cooling air introduced from the outside In the boiler apparatus provided with the ash conveying means, any one of the combustion air supply system and the exhaust gas system and any one from the boiler ash discharge part to the conveying terminal part of the ash conveying means It is characterized by having a configuration in which a bypass for supplying the gas in the system as a cooling medium is formed between these parts. And a means for solving the problems.

また、本発明の請求項２に係るボイラ装置において、前記バイパスは、前記燃焼空気供給系統と、前記灰搬送手段との間に形成され、前記燃焼空気供給系統内の燃焼空気の一部を冷却媒体として前記灰搬送手段に送給する構成としている。
さらに、本発明の請求項３に係るボイラ装置において、前記排ガス系統と前記ボイラとの間には、該排ガス系統内の排ガスを前記ボイラに戻す排ガス再循環系統が形成され、前記バイパスは、前記排ガス再循環系統と、前記ボイラの灰排出部から前記灰搬送手段の搬送終端部に至るまでのいずれかの部位との間に形成されている構成としている。 Further, in the boiler device according to claim 2 of the present invention, the bypass is formed between the combustion air supply system and the ash conveying means, and cools a part of the combustion air in the combustion air supply system. The medium is fed to the ash conveying means as a medium.
Furthermore, in the boiler device according to claim 3 of the present invention, an exhaust gas recirculation system for returning exhaust gas in the exhaust gas system to the boiler is formed between the exhaust gas system and the boiler. A configuration is formed between the exhaust gas recirculation system and any part from the ash discharge part of the boiler to the transfer terminal part of the ash transfer means.

さらにまた、本発明の請求項４に係るボイラ装置において、前記灰搬送手段は、前記ボイラの灰排出部から排出される灰を載せて搬送するコンベアベルトと、このコンベアベルトを覆うコンベアフードが備えられた乾式クリンカコンベアであって、前記バイパスは、前記燃焼空気供給系統及び排ガス系統のうちの少なくともいずれか一方の系統と、前記乾式クリンカコンベアのコンベアフードとの間に形成されている構成としている。   Furthermore, the boiler apparatus which concerns on Claim 4 of this invention WHEREIN: The said ash conveyance means is equipped with the conveyor hood which mounts and conveys the ash discharged | emitted from the ash discharge part of the said boiler, and the conveyor hood which covers this conveyor belt The dry clinker conveyor is configured such that the bypass is formed between at least one of the combustion air supply system and the exhaust gas system and a conveyor hood of the dry clinker conveyor. .

さらにまた、本発明の請求項５に係るボイラ装置において、前記ボイラの灰排出部と前記灰搬送手段との間には、該ボイラの灰排出部から排出される灰を貯めるホッパーが配置され、前記バイパスは、前記燃焼空気供給系統及び排ガス系統のうちの少なくともいずれか一方の系統と、前記ホッパーとの間に形成されている構成としている。
一方、本発明の請求項６に係る発明は、上記したボイラ装置の運転方法であって、前記燃焼空気供給系統及び排ガス系統のうちの少なくともいずれか一方の系統内の気体を冷却媒体として、前記ボイラの灰排出部から前記灰搬送手段の搬送終端部に至るまでのいずれかの部位に送給する構成としたことを特徴としており、このボイラ装置の運転方法の構成を前述した従来の課題を解決するための手段とている。 Furthermore, in the boiler device according to claim 5 of the present invention, a hopper for storing ash discharged from the ash discharge portion of the boiler is disposed between the ash discharge portion of the boiler and the ash transport means, The bypass is configured to be formed between at least one of the combustion air supply system and the exhaust gas system and the hopper.
On the other hand, the invention according to claim 6 of the present invention is the above-described operation method of the boiler apparatus, wherein the gas in at least one of the combustion air supply system and the exhaust gas system is used as a cooling medium. It is characterized in that it is configured to feed to any part from the ash discharge part of the boiler to the transfer terminal part of the ash transfer means, and the configuration of the operation method of this boiler device is the conventional problem described above. It is a means to solve.

本発明に係るボイラ装置及びその運転方法では、再生式空気予熱器からボイラに対して送給する燃焼空気供給系統内の燃焼空気の一部、及び、ボイラから排気された排ガス系統内の排ガスの一部のうちの少なくともいずれか一方を冷却媒体として、ボイラの灰排出部から灰搬送手段（乾式クリンカコンベア）の搬送終端部に至るまでのいずれかの部位に送給するようにしているので、その分だけ大気吸込みによって灰搬送手段に導入される冷却空気の量が減ることとなる。   In the boiler apparatus and the operation method thereof according to the present invention, a part of the combustion air in the combustion air supply system that is fed from the regenerative air preheater to the boiler, and the exhaust gas in the exhaust gas system that is exhausted from the boiler. Since at least one of some of the parts is used as a cooling medium, it is sent to any part from the boiler ash discharge part to the transfer terminal part of the ash transfer means (dry clinker conveyor). Accordingly, the amount of cooling air introduced into the ash conveying means by air suction is reduced.

すなわち、大気吸込みにより灰搬送手段に導入される冷却空気の量がボイラにおける所定の全燃焼空気量に占める割合が現状よりも減ることとなり、その結果、再生式空気予熱器を通過する空気量が増えることとなって、再生式空気予熱器の効率の向上が図られることとなる。
とくに、燃焼空気供給系統内の燃焼空気の一部、及び、排ガス系統内の排ガスの一部の双方をボイラの灰排出部から灰搬送手段の搬送終端部に至るまでのいずれかの部位に送給する場合には、大気吸込みにより灰搬送手段に導入される冷却空気の量がより一層減ることとなり、したがって、再生式空気予熱器を通過する空気量がさらに増えることとなって、再生式空気予熱器の効率のより一層の向上が図られることとなる。 That is, the ratio of the amount of cooling air introduced into the ash conveying means by atmospheric suction to the predetermined total combustion air amount in the boiler is reduced from the current state, and as a result, the amount of air passing through the regenerative air preheater is reduced. As a result, the efficiency of the regenerative air preheater is improved.
In particular, a part of the combustion air in the combustion air supply system and a part of the exhaust gas in the exhaust gas system are sent to any part from the ash discharge part of the boiler to the transfer terminal part of the ash transfer means. In the case of supplying air, the amount of cooling air introduced into the ash conveying means due to atmospheric suction is further reduced, and therefore the amount of air passing through the regenerative air preheater is further increased. The efficiency of the preheater will be further improved.

本発明の請求項１〜５に係るボイラ装置及び請求項６に係るボイラ装置の運転方法では、上記した構成としているので、外部からの空気を予熱して燃焼空気としてボイラに送り込む再生式空気予熱器の効率を向上させることができ、これに伴って、再生式空気予熱器の小型化及び低コスト化をも実現することが可能になるという非常に優れた効果がもたらされる。   In the boiler apparatus according to claims 1 to 5 of the present invention and the operation method of the boiler apparatus according to claim 6, the regenerative air preheating that preheats air from the outside and sends it to the boiler as combustion air is provided. As a result, it is possible to improve the efficiency of the regenerator, and as a result, it is possible to reduce the size and cost of the regenerative air preheater.

本発明に係るボイラ装置の一実施例を示す石炭焚きボイラ装置の概略構成説明図である。BRIEF DESCRIPTION OF THE DRAWINGS It is schematic structure explanatory drawing of the coal burning boiler apparatus which shows one Example of the boiler apparatus which concerns on this invention. 図１における石炭焚きボイラ装置の灰搬送手段としての乾式クリンカコンベアの拡大断面説明図である。It is an expanded sectional view explanatory drawing of the dry-type clinker conveyor as an ash conveyance means of the coal burning boiler apparatus in FIG. 本発明に係るボイラ装置の他の実施例を示す石炭焚きボイラ装置の概略構成説明図である。It is schematic structure explanatory drawing of the coal burning boiler apparatus which shows the other Example of the boiler apparatus which concerns on this invention. 本発明に係るボイラ装置のさらに他の実施例を示す石炭焚きボイラ装置の概略構成説明図である。It is schematic structure explanatory drawing of the coal fired boiler apparatus which shows other Example of the boiler apparatus which concerns on this invention. 本発明に係るボイラ装置の他の構成例を示すボイラの灰排出部における部分拡大説明図である。It is the elements on larger scale in the ash discharge part of the boiler which shows the other structural example of the boiler apparatus which concerns on this invention.

以下、本発明の実施例を図面に基づいて説明する。
（実施例１）
図１は、本発明の一実施例によるボイラ装置を示しており、この実施例では、ボイラ装置が石炭焚きボイラ装置である場合を例に挙げて説明する。
図１に示すように、このボイラ装置は、石炭焚きボイラ１と、伝熱部２ａが具備された再生式空気予熱器２と、石炭焚きボイラ１から排出される灰を搬送する灰搬送手段としての乾式クリンカコンベア３と、石炭を粉砕するミル４とから主としてなっている。 Embodiments of the present invention will be described below with reference to the drawings.
Example 1
FIG. 1 shows a boiler apparatus according to an embodiment of the present invention. In this embodiment, a case where the boiler apparatus is a coal-fired boiler apparatus will be described as an example.
As shown in FIG. 1, the boiler apparatus includes a coal fired boiler 1, a regenerative air preheater 2 provided with a heat transfer unit 2 a, and ash transport means for transporting ash discharged from the coal fired boiler 1. The dry clinker conveyor 3 and the mill 4 for crushing coal are mainly used.

再生式空気予熱器２は、配管１１を介して供給される大気吸込みの外部空気Ａ１（約３５℃）を伝熱部２ａで加熱するようになっており、石炭焚きボイラ１から排ガス系統２０を介して送られる排ガス（約３５０℃）によっても外部空気Ａ１を加熱するようになっている。
この再生式空気予熱器２は、上記のようにして大気吸込みの外部空気Ａ１を加熱し、高温となった燃焼空気Ａ２（約３３０℃）を燃焼空気供給系統１２を介して石炭焚きボイラ１に送り込むようになっている。 The regenerative air preheater 2 heats the air suction external air A1 (about 35 ° C.) supplied through the pipe 11 by the heat transfer section 2a. The external air A1 is also heated by exhaust gas (about 350 ° C.) sent through the air.
The regenerative air preheater 2 heats the external air A1 that is sucked into the atmosphere as described above, and the combustion air A2 (about 330 ° C.) that has become high temperature is supplied to the coal-fired boiler 1 via the combustion air supply system 12. It comes to send.

また、再生式空気予熱器２には、配管１１から分かれてミル４に対して微粉炭搬送用の空気Ａ３（石炭種類及び投入量に応じた量の空気）を温度調節して供給するミル空気供給系統３０が接続してある。
一方、灰搬送手段としての乾式クリンカコンベア３は、図２にも示すように、石炭焚きボイラ１から排出される灰Ｂを載せて搬送するコンベアベルト３ａと、このコンベアベルト３ａを覆うコンベアフード３ｂを具備しており、このコンベアフード３ｂに設けた吸気口３ｃを通して外部から大気吸込みの冷却空気Ａ４（約１５℃）を導入することで、コンベアベルト３ａ上における搬送途中の灰Ｂから顕熱を回収すると共に灰Ｂ中の未燃焼分を燃焼させ、これにより高温となった冷却空気Ａ５の一部を石炭焚きボイラ１に戻すようになっている。 Further, the regenerative air preheater 2 is supplied from the pipe 11 and is supplied to the mill 4 by adjusting the temperature of the air A3 for conveying the pulverized coal (the amount of air corresponding to the type of coal and the input amount). A supply system 30 is connected.
On the other hand, as shown in FIG. 2, the dry clinker conveyor 3 as the ash conveying means includes a conveyor belt 3a that carries the ash B discharged from the coal-fired boiler 1, and a conveyor hood 3b that covers the conveyor belt 3a. By introducing cooling air A4 (approximately 15 ° C.) that is sucked into the atmosphere from the outside through the intake port 3c provided in the conveyor hood 3b, sensible heat is generated from the ash B that is being conveyed on the conveyor belt 3a. While recovering, the unburned part in the ash B is burned, and a part of the cooling air A5 that has become high temperature is returned to the coal burning boiler 1.

この場合、石炭焚きボイラ１及び再生式空気予熱器２間に配置した燃焼空気供給系統１２と、乾式クリンカコンベア３のコンベアフード３ｂとの間には、バイパス１３が形成されており、再生式空気予熱器２から石炭焚きボイラ１に対して送給する燃焼空気Ａ２の一部を冷却媒体Ａ６（約３３０℃）として送給するようにしている。
なお、図１において、配管１１上の符号１４は押し込み送風ファンであり、ミル空気供給系統３０上の符号３１はミル空気供給ファンである。 In this case, a bypass 13 is formed between the combustion air supply system 12 disposed between the coal fired boiler 1 and the regenerative air preheater 2 and the conveyor hood 3b of the dry clinker conveyor 3, and the regenerative air Part of the combustion air A2 fed from the preheater 2 to the coal fired boiler 1 is fed as a cooling medium A6 (about 330 ° C.).
In FIG. 1, reference numeral 14 on the pipe 11 is a push-in air fan, and reference numeral 31 on the mill air supply system 30 is a mill air supply fan.

また、排ガス系統２０上の符号２１，２２，２３は、それぞれ脱硝部，ガス精製部，誘引通風ファンである。
このような石炭焚きボイラ装置では、石炭焚きボイラ１と再生式空気予熱器２とを結ぶ燃焼空気供給系統１２内の燃焼空気Ａ２の一部を冷却媒体Ａ６として、バイパス１３を介して乾式クリンカコンベア３のコンベアフード３ｂ内に送給するようにしているので、その分だけ、大気吸込みによって乾式クリンカコンベア３のコンベアフード３ｂ内に導入される冷却空気Ａ４の量が減ることとなる。 Reference numerals 21, 22, and 23 on the exhaust gas system 20 are a denitration unit, a gas purification unit, and an induced draft fan, respectively.
In such a coal fired boiler apparatus, a part of the combustion air A2 in the combustion air supply system 12 connecting the coal fired boiler 1 and the regenerative air preheater 2 is used as a cooling medium A6, and a dry clinker conveyor via the bypass 13. Accordingly, the amount of the cooling air A4 introduced into the conveyor hood 3b of the dry clinker conveyor 3 is reduced by that amount.

つまり、大気吸込みによってコンベアフード３ｂ内に導入される冷却空気Ａ４の量が石炭焚きボイラ１における所定の全燃焼空気量に占める割合が従前よりも減ることになるので、再生式空気予熱器２を通過する空気Ａ１の量が増えることとなり、したがって、再生式空気予熱器２の効率の向上が図られることとなる。
また、再生式空気予熱器２の効率が向上するのに伴って、再生式空気予熱器２の小型化及び低コスト化をも実現し得ることとなる。
（実施例２）
図３は、本発明の他の実施例によるボイラ装置を示しており、この実施例においても、ボイラ装置が石炭焚きボイラ装置である場合を示す。 That is, since the ratio of the amount of the cooling air A4 introduced into the conveyor hood 3b by the air suction to the predetermined total combustion air amount in the coal-fired boiler 1 is smaller than before, the regenerative air preheater 2 is The amount of air A1 that passes through increases, and therefore, the efficiency of the regenerative air preheater 2 is improved.
Further, as the efficiency of the regenerative air preheater 2 is improved, the regenerative air preheater 2 can be reduced in size and cost.
(Example 2)
FIG. 3 shows a boiler apparatus according to another embodiment of the present invention, and also in this embodiment, the boiler apparatus is a coal-fired boiler apparatus.

図３に示すように、このボイラ装置において、排ガス系統２０とボイラ１との間には、排ガス系統２０内の排ガスをボイラ１に戻す排ガス再循環系統２０Ａが形成されている。この排ガス再循環系統２０Ａは、ＮＯＸを低減すること及びボイラ１の炉内温度を下げることを目的として設置されている。
この実施例では、先の実施例における燃焼空気供給系統１２からのバイパス１３に替えて、排ガス系統２０に連通するバイパス３３が形成されている。このバイパス３３は、排ガス再循環系統２０Ａと、乾式クリンカコンベア３のコンベアフード３ｂとの間に形成されており、排バスの一部を冷却媒体Ｇ１（約３５０℃）として送給するようにしている。
この際、必要に応じて、バイパス３３から枝分かれさせた分岐バイパス３４をボイラ１の灰排出部１Ａに接続させることができる。 As shown in FIG. 3, in this boiler apparatus, an exhaust gas recirculation system 20 </ b> A that returns exhaust gas in the exhaust gas system 20 to the boiler 1 is formed between the exhaust gas system 20 and the boiler 1. The exhaust gas recirculation system 20A is installed for the purpose of lowering the furnace temperature and that the boiler 1 is reduced NO X.
In this embodiment, a bypass 33 communicating with the exhaust gas system 20 is formed instead of the bypass 13 from the combustion air supply system 12 in the previous embodiment. The bypass 33 is formed between the exhaust gas recirculation system 20A and the conveyor hood 3b of the dry clinker conveyor 3 so that a part of the exhaust bus is supplied as a cooling medium G1 (about 350 ° C.). Yes.
At this time, the branch bypass 34 branched from the bypass 33 can be connected to the ash discharge part 1A of the boiler 1 as necessary.

なお、図３において、排ガス再循環系統２０Ａ上の符号３５は排ガス再循環通風ファンであり、他の構成は、先の実施例におけるボイラ装置と同じである。
このような排ガス再循環系統２０Ａを有する石炭焚きボイラ装置において、排ガス系統２０に連通する排ガス再循環系統２０Ａ内の排ガスの一部を冷却媒体Ｇ１として、バイパス３３を介して乾式クリンカコンベア３のコンベアフード３ｂ内に送給するようにしているので、その分だけ、大気吸込みによって乾式クリンカコンベア３のコンベアフード３ｂ内に導入される冷却空気Ａ４の量が減ることとなる。 In FIG. 3, reference numeral 35 on the exhaust gas recirculation system 20 </ b> A is an exhaust gas recirculation ventilation fan, and other configurations are the same as those of the boiler apparatus in the previous embodiment.
In the coal fired boiler apparatus having such an exhaust gas recirculation system 20A, a part of the exhaust gas in the exhaust gas recirculation system 20A communicating with the exhaust gas system 20 is used as a cooling medium G1, and the conveyor of the dry clinker conveyor 3 via the bypass 33. Since the air is fed into the hood 3b, the amount of the cooling air A4 introduced into the conveyor hood 3b of the dry clinker conveyor 3 by the air suction is reduced by that amount.

したがって、大気吸込みによりコンベアフード３ｂ内に導入される冷却空気Ａ４の量が石炭焚きボイラ１における所定の全燃焼空気量に占める割合が従前よりも減ることになるので、再生式空気予熱器２を通過する空気Ａ１の量が増えることとなり、その結果、再生式空気予熱器２の効率の向上が図られることとなる。
また、これに伴って、再生式空気予熱器２の小型化及び低コスト化をも実現し得ることとなる。
（実施例３）
図４は、本発明のさらに他の実施例によるボイラ装置を示しており、この実施例においても、ボイラ装置が石炭焚きボイラ装置である場合を示す。 Therefore, since the ratio of the amount of the cooling air A4 introduced into the conveyor hood 3b by the air suction to the predetermined total combustion air amount in the coal-fired boiler 1 is smaller than before, the regenerative air preheater 2 is As a result, the amount of air A1 passing through increases, and as a result, the efficiency of the regenerative air preheater 2 is improved.
Along with this, the regenerative air preheater 2 can be reduced in size and cost.
(Example 3)
FIG. 4 shows a boiler apparatus according to still another embodiment of the present invention, and also in this embodiment, the boiler apparatus is a coal-fired boiler apparatus.

図４に示すように、この実施例におけるボイラ装置は、先の実施例における燃焼空気供給系統１２からのバイパス１３、及び、排ガス再循環系統２０Ａを介して排ガス系統２０に連通するバイパス３３の双方を備えたものとなっている。
この場合も、必要に応じて、バイパス３３から枝分かれさせた分岐バイパス３４をボイラ１の灰排出部１Ａに接続させることができ、他の構成は、先の実施例におけるボイラ装置と同じである。 As shown in FIG. 4, the boiler apparatus in this embodiment includes both a bypass 13 from the combustion air supply system 12 in the previous embodiment and a bypass 33 communicating with the exhaust gas system 20 through the exhaust gas recirculation system 20A. It has become.
Also in this case, the branch bypass 34 branched from the bypass 33 can be connected to the ash discharge part 1A of the boiler 1 as necessary, and the other configuration is the same as the boiler device in the previous embodiment.

この実施例におけるボイラ装置では、燃焼空気供給系統１２内の燃焼空気Ａ２の一部を冷却媒体Ａ６として、バイパス１３を介して乾式クリンカコンベア３のコンベアフード３ｂ内に送給するようにしていると共に、排ガス系統２０内の排ガスの一部を冷却媒体Ｇ１として、バイパス３３を介して乾式クリンカコンベア３のコンベアフード３ｂ内に送給するようにしているので、大気吸込みにより乾式クリンカコンベア３に導入される冷却空気Ａ４の量がより一層減ることとなる。   In the boiler apparatus in this embodiment, a part of the combustion air A2 in the combustion air supply system 12 is fed as a cooling medium A6 into the conveyor hood 3b of the dry clinker conveyor 3 through the bypass 13. Since a part of the exhaust gas in the exhaust gas system 20 is fed as the cooling medium G1 into the conveyor hood 3b of the dry clinker conveyor 3 via the bypass 33, it is introduced into the dry clinker conveyor 3 by air suction. Therefore, the amount of the cooling air A4 is further reduced.

したがって、再生式空気予熱器２を通過する空気量Ａ１がさらに増えることとなって、再生式空気予熱器２の効率のより一層の向上が図られることとなる。
なお、上記した各実施例では、本発明に係るボイラ装置が石炭焚きボイラ装置である場合を例に挙げて説明したが、これに限定されるものではない。
また、本発明に係るボイラ装置の構成は、上記した実施例の構成に限定されるものではなく、他の構成として、例えば、図５に部分的に示すように、ボイラ１の灰排出部１Ａと乾式クリンカコンベア３のコンベアフード３ｂとの間に、ボイラ１の灰排出部１Ａから排出される灰を貯めるホッパー４１を配置し、このホッパー４１と、燃焼空気供給系統１２及び排ガス系統２０のうちの少なくともいずれか一方の系統との間に、バイパス４３を形成するようにしてもよい。 Therefore, the amount of air A1 passing through the regenerative air preheater 2 is further increased, and the efficiency of the regenerative air preheater 2 is further improved.
In addition, in each above-mentioned Example, although the case where the boiler apparatus which concerns on this invention was mentioned as an example and was a coal fired boiler apparatus was demonstrated, it is not limited to this.
Moreover, the structure of the boiler apparatus which concerns on this invention is not limited to the structure of an above-described Example, For example, as shown partially in FIG. And a hopper 41 for storing ash discharged from the ash discharge section 1A of the boiler 1 between the hopper 41 and the dry clinker conveyor 3 and the conveyor hood 3b. Of the hopper 41, the combustion air supply system 12, and the exhaust gas system 20 A bypass 43 may be formed between at least one of the systems.

１ 石炭焚きボイラ
２ 再生式空気予熱器
２ａ 伝熱部
３ 乾式クリンカコンベア（灰搬送手段）
３ａ コンベアベルト
３ｂ コンベアフード
１２ 燃焼空気供給系統
１３，３３，３４，４３ バイパス
２０ 排ガス系統
２０Ａ 排ガス再循環系統
４１ ホッパー
Ａ１ 外部からの空気
Ａ２ 燃焼空気
Ａ４ 冷却空気
Ａ６，Ｇ１ 冷却媒体
Ｂ 灰 1 Coal-fired boiler 2 Regenerative air preheater 2a Heat transfer section 3 Dry clinker conveyor (ash transport means)
3a Conveyor belt 3b Conveyor hood 12 Combustion air supply system 13, 33, 34, 43 Bypass 20 Exhaust gas system 20A Exhaust gas recirculation system 41 Hopper
A1 Air from outside A2 Combustion air A4 Cooling air A6, G1 Cooling medium B Ash

Claims (6)

ボイラと、
外部からの空気を予熱する伝熱部が具備された再生式空気予熱器と、
前記再生式空気予熱器で予熱された外部からの空気を燃焼空気として前記ボイラに送給する燃焼空気供給系統と、
前記ボイラから排気される排ガスを前記再生式空気予熱器に送給する排ガス系統と、
前記ボイラから排出される灰を外部から導入される冷却空気により冷却しつつ搬送する灰搬送手段
を備えたボイラ装置において、
前記燃焼空気供給系統及び排ガス系統のうちの少なくともいずれか一方の系統と、前記ボイラの灰排出部から前記灰搬送手段の搬送終端部に至るまでのいずれかの部位との間には、該系統内の気体を冷却媒体として送給するバイパスが形成されている
ことを特徴とするボイラ装置。 With a boiler,
A regenerative air preheater provided with a heat transfer section for preheating air from the outside;
A combustion air supply system that feeds external air preheated by the regenerative air preheater to the boiler as combustion air;
An exhaust gas system for supplying exhaust gas exhausted from the boiler to the regenerative air preheater;
In the boiler apparatus provided with ash conveying means for conveying the ash discharged from the boiler while being cooled by cooling air introduced from the outside,
Between at least one of the combustion air supply system and the exhaust gas system and any part from the ash discharge part of the boiler to the transfer terminal part of the ash transfer means, the system A boiler device is provided in which a bypass for supplying the inside gas as a cooling medium is formed. 前記バイパスは、前記燃焼空気供給系統と、前記灰搬送手段との間に形成され、前記燃焼空気供給系統内の燃焼空気の一部を冷却媒体として前記灰搬送手段に送給する請求項１に記載のボイラ装置。   The bypass is formed between the combustion air supply system and the ash conveying means, and sends a part of the combustion air in the combustion air supply system to the ash conveying means as a cooling medium. The boiler device described. 前記排ガス系統と前記ボイラとの間には、該排ガス系統内の排ガスを前記ボイラに戻す排ガス再循環系統が形成され、前記バイパスは、前記排ガス再循環系統と、前記ボイラの灰排出部から前記灰搬送手段の搬送終端部に至るまでのいずれかの部位との間に形成されている請求項１に記載のボイラ装置。   Between the exhaust gas system and the boiler, an exhaust gas recirculation system for returning the exhaust gas in the exhaust gas system to the boiler is formed, and the bypass is connected to the exhaust gas recirculation system and the boiler ash discharge unit. The boiler device according to claim 1, wherein the boiler device is formed between any part of the ash transport means and the transport terminal. 前記灰搬送手段は、前記ボイラの灰排出部から排出される灰を載せて搬送するコンベアベルトと、このコンベアベルトを覆うコンベアフードが備えられた乾式クリンカコンベアであって、前記バイパスは、前記燃焼空気供給系統及び排ガス系統のうちの少なくともいずれか一方の系統と、前記乾式クリンカコンベアのコンベアフードとの間に形成されている請求項１に記載のボイラ装置。   The ash conveying means is a dry clinker conveyor provided with a conveyor belt that carries and conveys the ash discharged from the ash discharge portion of the boiler, and a conveyor hood that covers the conveyor belt, and the bypass is the combustion The boiler apparatus according to claim 1, wherein the boiler apparatus is formed between at least one of an air supply system and an exhaust gas system and a conveyor hood of the dry clinker conveyor. 前記ボイラの灰排出部と前記灰搬送手段との間には、該ボイラの灰排出部から排出される灰を貯めるホッパーが配置され、前記バイパスは、前記燃焼空気供給系統及び排ガス系統のうちの少なくともいずれか一方の系統と、前記ホッパーとの間に形成されている請求項１に記載のボイラ装置。   A hopper for storing the ash discharged from the boiler ash discharge unit is disposed between the ash discharge unit of the boiler and the ash transfer means, and the bypass includes the combustion air supply system and the exhaust gas system. The boiler device according to claim 1, wherein the boiler device is formed between at least one of the systems and the hopper. 請求項１に記載のボイラ装置の運転方法であって、
前記燃焼空気供給系統及び排ガス系統のうちの少なくともいずれか一方の系統内の気体を冷却媒体として、前記ボイラの灰排出部から前記灰搬送手段の搬送終端部に至るまでのいずれかの部位に送給する
ことを特徴とするボイラ装置の運転方法。 A method for operating the boiler device according to claim 1,
The gas in at least one of the combustion air supply system and the exhaust gas system is used as a cooling medium, and is sent to any part from the ash discharge part of the boiler to the transfer terminal part of the ash transfer means. The operation method of the boiler apparatus characterized by supplying.
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