JPH02251008A - Air preheater and prevention of abnormal temperature rise - Google Patents
Air preheater and prevention of abnormal temperature riseInfo
- Publication number
- JPH02251008A JPH02251008A JP1070686A JP7068689A JPH02251008A JP H02251008 A JPH02251008 A JP H02251008A JP 1070686 A JP1070686 A JP 1070686A JP 7068689 A JP7068689 A JP 7068689A JP H02251008 A JPH02251008 A JP H02251008A
- Authority
- JP
- Japan
- Prior art keywords
- air
- exhaust gas
- air preheater
- temperature
- 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.)
- Granted
Links
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 28
- 230000002265 prevention Effects 0.000 title description 4
- 238000001816 cooling Methods 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 238000005192 partition Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 47
- 238000002485 combustion reaction Methods 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 abstract description 6
- 230000005856 abnormality Effects 0.000 abstract description 5
- 230000020169 heat generation Effects 0.000 abstract description 5
- 238000005338 heat storage Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000011109 contamination Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はボイラプラント等の燃焼炉における燃焼排ガス
と燃焼用空気の熱交換を行う空気予熱装置に係り、特に
排ガス中の煤、未燃カーボンおよび未燃分を含む灰分な
どが熱交換器のヒーティングエレメント（蓄熱体）に付
着堆積し、これの酸化発熱による空気予熱装置の火災の
発生の防止ならびに蓄熱体の過熱溶損などによる損傷を
防止するのに好適な空気予熱装置およびその異常昇温防
止法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air preheating device for exchanging heat between combustion exhaust gas and combustion air in a combustion furnace such as a boiler plant. Ash content containing unburned matter adheres and accumulates on the heating element (heat storage body) of the heat exchanger, preventing fires in the air preheating device due to oxidation heat generation, and damage due to overheating and melting of the heat storage body. The present invention relates to an air preheating device suitable for preventing abnormal temperature rise and a method for preventing abnormal temperature rise.
従来、ボイラプラントなどの燃焼炉の燃焼排ガスの煙道
に、排ガスの熱損失を少なくして燃焼効率を高めること
、および燃焼速度を大きくして火炉の構造をシンプルに
することなどの理由で、煙道排ガスの有する熱量を利用
して燃焼用空気と熱交換させ、空気を予熱する空気予熱
器が設けられている。この空気予熱器は、軽量小型で広
い伝熱面積が得られること、および通風損失が少ないこ
とが要求され、この要求を満たすものとして、例えば回
転再生式空気予熱器が多用されている〔機械工学便覧、
改訂第６版、日本機械学会発行（１９７７年）：１・７
・４空気予熱器の構造、１３３５〜１３−３６頁〕。こ
の回転再生式空気予熱器は□、熱交換を行う蓄熱体（ヒ
ーティングエレメント）に排ガス中に含まれる煤、未燃
カーボンあるいは未燃分を含む灰分が付着し、これが堆
積して燃焼を起こし、空気予熱器に火災の発生の危険性
が生じたり、また蓄熱体が過熱溶損されるなどの問題が
あった。Conventionally, it has been used in the flue of flue gas of combustion furnaces such as boiler plants for reasons such as reducing heat loss of exhaust gas to increase combustion efficiency, and increasing combustion speed to simplify the structure of the furnace. An air preheater is provided that preheats the air by exchanging heat with combustion air using the amount of heat contained in the flue gas. This air preheater is required to be lightweight and compact, provide a large heat transfer area, and have low ventilation loss.To meet these requirements, for example, a rotary regenerative air preheater is often used [Mechanical Engineering Handbook,
Revised 6th edition, published by Japan Society of Mechanical Engineers (1977): 1.7
・4 Air Preheater Structure, pp. 1335-13-36]. In this rotary regenerative air preheater, soot, unburned carbon, or ash containing unburned matter contained in exhaust gas adheres to the heat storage element (heating element) that performs heat exchange, and this accumulates and causes combustion. There were problems such as the risk of fire occurring in the air preheater and the heat storage body being melted due to overheating.
ここで、従来の空気予熱装置の一例な挙げ、その構成な
らびに動作について説明する。第２図に示すごとく、回
転再生用空気予熱器１は、図示していないが鋼板などか
らなる多数のヒーティングエレメントが設けられていて
、これが高温の燃焼排ガスが通過する加熱ゾーンで加熱
され、蓄熱されたヒーティングエレメントを徐々に回転
させながら、押し込み送風機などによって送入される冷
たい燃焼用空気と接触させる予熱ゾーンへと移動させ、
燃焼用空気を予熱する構造の熱交換器である。上述した
ごとく、燃焼排ガス中には、煤、未燃カーボンあるいは
未燃分を含む灰分（以下、未燃分と言う）を含んでいる
ので、これが空気予熱器１のヒーティングエレメント部
に徐々に付着し堆積される。この未燃分がヒーティング
エレメントに堆積され、約２００〜２５０℃以上の温度
に加熱されると、酸素の存在下で燃焼（酸化発熱反応）
し、かつ上記エレメント部での酸化発熱によるエレメン
トへの蓄熱状態が長く持続されるとエレメントが溶損さ
れたり、あるいは空気予熱器１に火災が発生するなどの
重大な問題があった。Here, an example of a conventional air preheating device, its configuration, and operation will be explained. As shown in FIG. 2, the rotary regeneration air preheater 1 is provided with a large number of heating elements made of steel plates (not shown), which are heated in a heating zone through which high-temperature combustion exhaust gas passes. While gradually rotating the heated heating element, it is moved to a preheating zone where it is brought into contact with cold combustion air introduced by a forced air blower, etc.
This is a heat exchanger designed to preheat combustion air. As mentioned above, the combustion exhaust gas contains soot, unburned carbon, or ash containing unburned matter (hereinafter referred to as "unburned matter"), so this gradually enters the heating element of the air preheater 1. It adheres and is deposited. When this unburned content is deposited on the heating element and heated to a temperature of approximately 200-250°C or higher, it burns in the presence of oxygen (oxidation exothermic reaction).
However, if the state of heat accumulation in the element due to the heat generated by oxidation in the element portion continues for a long time, there are serious problems such as the element being melted and damaged, or a fire occurring in the air preheater 1.
このため、従来技術においては、例えば特開昭５５−５
３６２３号公報において提案されているように、空気予
熱器１には、空気予熱器１の出口排ガスの温度を検出す
る排ガス温度検出器８および予熱空気出口温度検出器９
を設けて、空気予熱器１から出る排ガスおよび空気の温
度の異常上昇、あるいは５Ｏｘ（またはＣＯ）検出器１
３を設け、ＳＯｘまたはＣＯ値の異常上昇を検知して、
消火水ライン１０より消火用水または消火剤を、空気予
熱器１内にスプレーして異常昇温の抑制あるいは火災発
生の防止対策が行われていた。しかし、消火用水あるい
は消火剤のスプレーの後、空気予熱器１のヒーティング
エレメントが汚染されたり、あるいは消火用水などによ
る急冷により生じた歪によってエレメントの損傷などが
発生するため、空気予熱器１の点検補修が必要となり、
直ちに空気予熱器の再使用ができなくなることから、ボ
イラなどの燃焼炉の運転の再開が直ちにできないという
問題があった。For this reason, in the prior art, for example,
As proposed in Publication No. 3623, the air preheater 1 includes an exhaust gas temperature detector 8 and a preheated air outlet temperature detector 9 for detecting the temperature of the exhaust gas at the outlet of the air preheater 1.
is installed to detect an abnormal rise in the temperature of the exhaust gas and air coming out of the air preheater 1, or a 5Ox (or CO) detector 1.
3 to detect an abnormal increase in SOx or CO levels,
Fire extinguishing water or extinguishing agent was sprayed into the air preheater 1 from the fire extinguishing water line 10 to suppress abnormal temperature rise or prevent the occurrence of fire. However, after spraying fire extinguishing water or extinguishing agent, the heating element of the air preheater 1 may become contaminated, or the element may be damaged due to distortion caused by rapid cooling with fire extinguishing water. Inspection and repair are required,
Since the air preheater cannot be reused immediately, there is a problem in that the operation of a combustion furnace such as a boiler cannot be restarted immediately.
上述したごとく、従来技術においては空気予熱器の異常
昇温の際にスプレーする消火用水または消火剤によって
ヒーティングエレメントが汚染され、また消火用水など
による急速冷却のための歪によるヒーティングエレメン
トの損傷などに対する配慮は全くなされておらず、消火
用水あるいは消火剤をスプレーして冷却した後は、ヒー
ティングエレメントの洗浄および損傷箇所の点検修理を
行わなければ空気予熱器の再使用ができないという問題
があった。As mentioned above, in the conventional technology, the heating element is contaminated by fire extinguishing water or extinguishing agent sprayed when the temperature of the air preheater rises abnormally, and the heating element is damaged due to distortion caused by rapid cooling by fire extinguishing water. No consideration was given to such issues, and after cooling by spraying fire extinguishing water or extinguishing agent, the air preheater could not be reused unless the heating element was cleaned and damaged areas were inspected and repaired. there were.
本発明の目的は、上記従来技術における問題点を解消し
、空気予熱器のヒーティングエレメントの汚染あるいは
急冷による損傷を与えることなく、空気予熱器のヒーテ
ィングニレメンＩ・の蓄熱昇温の初期段階において、効
果的にヒーティングエレメントを冷却し、その蓄熱昇温
を防止する手段を設けた空気予熱装置およびその異常Ｍ
温防止法を提供することにある。It is an object of the present invention to solve the problems in the prior art described above, and to prevent the heating element of the air preheater from being contaminated or damaged by rapid cooling during the initial heat storage temperature increase of the heating element I of the air preheater. An air preheating device equipped with a means for effectively cooling a heating element and preventing heat storage from rising in temperature during the stage, and its malfunction M
The purpose is to provide a method for preventing heat.
上記本発明の目的は、ボイラプラントなどの燃焼炉の煙
道部に設けられている燃焼用空気の予熱装置において、
燃焼用空気送入用の送風機から空気予熱器に至る通路に
、上記送風機の空気出口部から空気予熱器の排ガス人ロ
ダク１一部までの間に、強制冷却用の空気を送入するた
めのバイパスダクトを設け、空気予熱器のヒーティング
エレメントに堆積した未燃分の酸化発熱による昇温の初
期段階に、その異常昇温もしくは排ガス中のＳＯｘまた
はＣＯ濃度の異常上昇を検知して、冷却用空気を強制的
に空気予熱器の排ガス入口ダクト部に供給し、ヒーティ
ングエレメントを冷却することにより、達成される。The object of the present invention is to provide a combustion air preheating device installed in a flue section of a combustion furnace such as a boiler plant.
A passageway leading from the blower for feeding combustion air to the air preheater, for feeding forced cooling air between the air outlet of the blower and part of the exhaust gas cylinder of the air preheater. By installing a bypass duct, during the initial stage of temperature rise due to oxidation heat generation of unburned substances accumulated in the heating element of the air preheater, abnormal temperature rise or abnormal rise in SOx or CO concentration in exhaust gas is detected and cooling is performed. This is achieved by forcing air into the exhaust gas inlet duct of the air preheater to cool the heating element.
そして、本発明の空気予熱装置における異常昇温防止法
は、空気予熱器から出る予熱空気の温度、空気予熱器の
排ガス出口温度などの検出、または排ガス中のＳＯｘま
たはＣＯなどのガスの検出、あるいは上記の温度および
ガスの検出によって、排ガスの温度が異常に昇温し始め
た温度（例えば２００〜２５０°Ｃ以上の温度）あるい
は排ガス中のＳＯｘまたはＣＯ濃度が設定の濃度に対し
異常に増加し始めた時点において、燃焼用空気の押し込
み送風機の空気出口部から空気予熱器の排ガス入口ダク
ト部の間に設けられた強制冷却用バイパスダクトの仕切
りダンパを開放し、冷却用空気を空気予熱器内に送入す
ることにより、空気予熱器の異常昇温を未然に防止する
方法である。The abnormal temperature rise prevention method in the air preheating device of the present invention includes detecting the temperature of the preheated air coming out of the air preheater, the exhaust gas outlet temperature of the air preheater, or detecting gases such as SOx or CO in the exhaust gas. Or, by detecting the above temperature and gas, the temperature of the exhaust gas starts to rise abnormally (e.g. 200 to 250°C or higher) or the SOx or CO concentration in the exhaust gas increases abnormally compared to the set concentration. At the point when the combustion air starts to cool, the partition damper of the forced cooling bypass duct installed between the air outlet of the forced air blower for combustion air and the exhaust gas inlet duct of the air preheater is opened, and the cooling air is transferred to the air preheater. This method prevents abnormal temperature rise of the air preheater by feeding the air into the air preheater.
本発明の空気予熱装置およびその異常昇温防止方法にお
いては、空気予熱器のヒーティングエレメント部に、燃
焼排ガス中の未燃分が堆積し、これが燃焼（酸化発熱）
し始めると、空気予熱器の予熱空気および燃焼排ガス中
温度変化（温度」−昇）および排ガス中のＳＯＸまたは
Ｃ○濃度の変化（増加）が生じる。これらの変化を、そ
れぞれの検出器によって早期にその異常状態を発見する
ことにより、押し込み送風機からの冷却用空気を、強制
冷却用バイパスダクトを通じて自動的に送入することが
できるので、空気予熱器のヒーティングエレメントに堆
積した未燃分の酸化発熱の開始段階で、その蓄熱異常昇
温を未然に防止することが可能となる。そして、空気予
熱器のヒーティングエレメントの蓄熱昇温の防止を空気
によって行うためエレメントの汚染および冷却用水など
を用いた場合の急冷却によって生じるエレメントの損傷
を防止することができ、直ちに空気予熱器の再使用が可
能となり、ボイラプラントの運転の再開ができる。In the air preheating device and the abnormal temperature rise prevention method of the present invention, unburned components in the combustion exhaust gas accumulate in the heating element of the air preheater, and this causes combustion (oxidation heat generation).
When this starts, a temperature change (increase) in the preheated air of the air preheater and the combustion exhaust gas and a change (increase) in the SOX or CO concentration in the exhaust gas occur. By detecting these changes at an early stage using their respective detectors, cooling air from the forced air blower can be automatically introduced through the forced cooling bypass duct. It is possible to prevent abnormal temperature rise due to heat accumulation at the beginning stage of oxidative heat generation of unburned matter deposited on the heating element. In addition, since air is used to prevent heat accumulation and temperature rise in the heating element of the air preheater, it is possible to prevent contamination of the element and damage to the element caused by rapid cooling when using cooling water, etc. This makes it possible to reuse the boiler plant and resume operation of the boiler plant.
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。An embodiment of the present invention will be described below in more detail based on the drawings.
第１図に、本発明の空気予熱装置の構成の−例を示す。FIG. 1 shows an example of the configuration of the air preheating device of the present invention.
図において、空気予熱器１には、押し込み送風機７から
予熱する燃焼用空気を送入する空気ダクトが接続され、
他方、燃焼炉の煙道１５から高温の燃焼排ガスを送入す
る排ガスダクト１４が接続されている。空気予熱器１内
では、ヒーティングエレメント（図示せず）を回転させ
ながら高温の排ガスによって加熱する蓄熱ゾーンと、加
熱して蓄熱させたヒーティングエレメントと予熱用の冷
風とが接触する予熱ゾーンとが設けられ、高温の排ガス
と空気とが熱交換され予熱空気を生成させる構造になっ
ている。そして、空気予熱器１の予熱空気の出口部には
予熱空気出口温度検出器９、そして空気予熱器１の排ガ
スの出口部には排ガス出口温度検出器８および５Ｏｘ（
またはＣＯ）検出器１３が設けられていて、これらの検
出器からの検出信号が異常を示したときに、強制冷却用
バイパスダクト１１に設けられているバイパスダクト仕
切りダンパ１２が開放され、冷却用空気が空気予熱器１
の排ガス入口ダクト部近傍に送入され、空気予熱器１の
ヒーティングエレメントが冷却される構造になっている
。In the figure, an air duct for feeding combustion air to be preheated from a forced air blower 7 is connected to the air preheater 1.
On the other hand, an exhaust gas duct 14 is connected to which high-temperature combustion exhaust gas is introduced from a flue 15 of the combustion furnace. Inside the air preheater 1, there are a heat storage zone in which heating is performed using high-temperature exhaust gas while rotating a heating element (not shown), and a preheating zone in which the heated and stored heat element comes into contact with cold air for preheating. The structure is such that high-temperature exhaust gas and air exchange heat to generate preheated air. A preheated air outlet temperature detector 9 is installed at the preheated air outlet of the air preheater 1, and an exhaust gas outlet temperature detector 8 and 5Ox (
or CO) detectors 13 are provided, and when the detection signals from these detectors indicate an abnormality, the bypass duct partition damper 12 provided in the forced cooling bypass duct 11 is opened, and the cooling Air is air preheater 1
The structure is such that the heating element of the air preheater 1 is cooled by being introduced into the vicinity of the exhaust gas inlet duct of the air preheater 1.
本発明の空気予熱装置において、例えば燃焼用空気送入
用の押し込み送風機７を停止し、ボイラのホットバンキ
ングが行われた場合、節炭器２の出口排ガス温度が約２
００℃程度であるときに、空気予熱器１のヒーティング
エレメントに堆積した未燃分が酸化され始め、その発熱
でニレメンｌ−が蓄熱され始めると、空気予熱器１の排
ガス出口部に設けられている排ガス出口温度検出器８、
空気予熱器１の出口部に設けられている予熱空気出口温
度検出器９、または空気予熱器１の排ガス出口部に設け
られている５Ｏｘ（またはＣＯ）検出器１３に異常が現
れ、それらの温度および５Ｏｘ（ＣＯ）濃度が上昇し始
める。この異常を検出した段階で、押し込み送風機７を
運転し、押し込み送風機出口ダンパ５および予熱空気出
口ダンパ６および空気予熱器排ガス人口ダンパ３を閉に
して、バイパスダクト仕切りダンパ１２および空気予熱
器排ガス出口ダンパ４を開とすると、空気予熱器１内に
、強制冷却用バイパスダクト１１より冷却用空気が送入
され、堆積した未燃分が酸化発熱し蓄熱中のヒーティン
グエレメントが冷却され、エレメントの蓄熱異常昇温か
その初期段階で防止できることになる。そして、空気予
熱器１のエレメントの蓄熱昇温の初期段階での空気によ
る冷却であるため、エレメントは汚染や損傷を受けるこ
となく、また冷却用水などによる急冷の場合に、しばし
ば起こる熱歪によるエレメントの損傷が全くない。そし
て、空気予熱器１のヒーティングエレメントに蓄熱昇温
防止の冷却用空気を送入した後において、ヒーティング
エレメントは必要以上に冷却されることなく、適度の温
度に冷却されるだけであり、またエレメントの汚染も生
じないので、そのままの状態で空気予熱器を再起動させ
ることが可能となり、ボイラ装置の高率運用をはかるこ
とができるメリットがある。In the air preheating device of the present invention, for example, when the forced air blower 7 for feeding combustion air is stopped and hot banking of the boiler is performed, the exhaust gas temperature at the exit of the economizer 2 is approximately 2.
When the temperature is around 00°C, the unburned content deposited on the heating element of the air preheater 1 begins to oxidize, and the heat generated by this heat storage begins to accumulate. Exhaust gas outlet temperature detector 8,
An abnormality appears in the preheated air outlet temperature detector 9 provided at the outlet of the air preheater 1 or the 5Ox (or CO) detector 13 provided at the exhaust gas outlet of the air preheater 1, and the temperature and 5Ox (CO) concentration begins to rise. When this abnormality is detected, the forced air blower 7 is operated, the forced air blower outlet damper 5, the preheated air outlet damper 6, and the air preheater exhaust gas artificial damper 3 are closed, and the bypass duct partition damper 12 and the air preheater exhaust gas outlet are closed. When the damper 4 is opened, cooling air is sent into the air preheater 1 from the forced cooling bypass duct 11, and the accumulated unburned matter oxidizes and generates heat, cooling the heating element that is storing heat. Abnormal heat storage rise can be prevented at its initial stage. Since air is used to cool the element of the air preheater 1 at the initial stage of heat storage temperature rise, the element is not contaminated or damaged, and the element is not affected by thermal strain that often occurs when rapidly cooling with cooling water. There is no damage at all. After the cooling air for preventing heat accumulation and temperature rise is fed into the heating element of the air preheater 1, the heating element is not cooled more than necessary, but is only cooled to an appropriate temperature. Furthermore, since no element contamination occurs, it is possible to restart the air preheater in the same state, which has the advantage of allowing high efficiency operation of the boiler equipment.
なお、上記の実施例において、空気予熱器１のヒーティ
ングエレメントの冷却用空気を、燃焼用空気送入用の押
し込み送風機７より供給する方式について述べたが、上
記押し込み送風機７の代わりに、他の型式の大気吸い込
みファン（例えば、ＰＡＦ （−次空気フアン）、シー
リングエヤーファンなど）等から、冷却用空気を送入す
る強制冷却用バイパスダクト１１を、空気予熱器１の排
ガス入口ダクト部に導く方式にしても、効果的に空気予
熱器１のヒーティングエレメントの異常昇温を防止する
ことができる。In the above embodiment, a method was described in which cooling air for the heating element of the air preheater 1 is supplied from the forced air blower 7 for supplying combustion air. A forced cooling bypass duct 11 that feeds cooling air from a type of air suction fan (for example, PAF (-secondary air fan), ceiling air fan, etc.) is connected to the exhaust gas inlet duct of the air preheater 1. Even if the heating element is guided, abnormal temperature rise of the heating element of the air preheater 1 can be effectively prevented.
以上詳細に説明したごとく、従来技術においては、空気
予熱器の異常温度上昇によるヒーティングエレメントの
溶損、あるいは火災の発生の防止対策として、空気予熱
器の温度、５Ｏｘ（またはＣＯ）等の濃度の異常上昇を
検知し、冷却用水または消火剤をヒーティングエレメン
トに散布（スプレー）し冷却していたため、エレメント
の汚染および急冷により生じる熱歪が原因するエレメン
トの亀裂損傷などが発生し、そのためエレメントの洗浄
、損傷箇所の点検・補修を行わないと空気予熱器の再使
用ができないという問題があった。As explained in detail above, in the conventional technology, the temperature of the air preheater, the concentration of 5Ox (or CO), etc. are As a result, cooling water or fire extinguishing agent was sprayed onto the heating element to cool it down, resulting in contamination of the element and crack damage to the element due to thermal strain caused by rapid cooling. There was a problem in that the air preheater could not be reused unless the air preheater was cleaned, and damaged areas were inspected and repaired.
しかし、本発明の空気予熱装置およびその異常昇温防止
法を適用すると、空気予熱器のヒーティングエレメント
の蓄熱昇温の防止を、その初期において空気により効果
的に冷却するため、はぼ完全にヒーティングエレメント
の異常昇温を防止することができ、エレメントの汚染、
熱歪などによる損傷などの問題が全く生じないので、ヒ
ーティングエレメントを空気冷却した後においても、た
だちに再使用することが可能となり、ボイラプラントの
効率の高い運用を行うことができる。However, when the air preheating device and the abnormal temperature rise prevention method of the present invention are applied, the heat storage temperature rise of the heating element of the air preheater can be almost completely prevented because the air is effectively cooled at the initial stage. It can prevent abnormal temperature rise of the heating element and prevent contamination of the element.
Since problems such as damage due to thermal distortion etc. do not occur at all, even after the heating element has been air cooled, it can be immediately reused, and the boiler plant can be operated with high efficiency.
第１図は本発明の実施例において例示した空気予熱装置
の構成を示す系統図、第２図は従来の空気予熱装置の構
成を示す系統図である。
１・・空気予熱器
２・節炭器
３・・空気予熱器排ガス入口ダンパ
４・・空気予熱器排ガス出口ダンパ
５・・押し込み送風機出口ダンパ
６ 予熱空気出口ダンパ
フ・押し込み送風機
８ 排ガス出１コ温度検出器
９・・Ｐ熱空気出口温度検出器
１０ 消火水ライン
１１ 強制冷却用バイパスダクト
１２・・バイパスダクト仕切りダンパ
＋３− Ｓ Ｏｘ （またはＣＯ）検出器１４・排ガス
ダクト
１５・・煙道FIG. 1 is a system diagram showing the configuration of an air preheating device exemplified in an embodiment of the present invention, and FIG. 2 is a system diagram showing the configuration of a conventional air preheating device. 1. Air preheater 2. Economizer 3. Air preheater exhaust gas inlet damper 4. Air preheater exhaust gas outlet damper 5. Forced blower outlet damper 6 Preheating air outlet damper/forced blower 8 Exhaust gas outlet 1 temperature Detector 9...P hot air outlet temperature detector 10 Fire extinguishing water line 11 Forced cooling bypass duct 12...Bypass duct partition damper +3- S Ox (or CO) detector 14/Exhaust gas duct 15... Flue
Claims (1)
気送入用の送風機から供給される燃焼用空気と、上記高
温の燃焼排ガスとを熱交換させて燃焼用空気を予熱する
空気予熱器を有する燃焼炉の空気予熱装置において、上
記送風機の空気出口部と上記空気予熱器の排ガス入口部
との間に、上記送風機から空気予熱器の内部へ冷却用空
気を送入する通路である強制冷却用バイパスダクトを設
け、上記空気予熱器の予熱空気出口部および空気予熱器
の排ガス出口部のうちの少なくとも１箇所に、異常温度
上昇を検出する温度検出器を設けるか、もしくは上記温
度検出器と、上記空気予熱器の排ガス出口部に排ガス中
のＳＯｘまたはＣｏ濃度もしくはその両方の濃度の異常
値を検出するガス検出器を設け、上記温度検出器および
ガス検出器のうちのいずれか一方もしくは両方の異常信
号によって、上記強制冷却用バイパスダクトに設けられ
ている仕切りダンパを開放し、上記空気予熱器内に冷却
用空気を送入する手段を設けたことを特徴とする空気予
熱装置。 ２、特許請求の範囲第１項記載の空気予熱装置において
、強制冷却用バイパスダクトに冷却用空気を送入するた
めの送風機が、燃焼用空気送入用の送風機以外の別個に
配置された送風機によることを特徴とする空気予熱装置
。 ３、燃焼炉の燃焼排ガスの通路に設けられた、燃焼用空
気送入用の送風機から供給される燃焼用空気と、上記高
温の燃焼排ガスとを熱交換させて燃焼用空気を予熱する
空気予熱器を有する燃焼炉の空気予熱装置の異常昇温を
防止する方法であって、上記送風機の空気出口部と上記
空気予熱器の排ガス入口部との間に、上記送風機から空
気予熱器の内部へ冷却用空気を送入する通路である強制
冷却用バイパスダクトを設け、上記空気予熱器の予熱空
気出口部および空気予熱器の排ガス出口部のうちの少な
くとも１箇所に、異常温度上昇を検出する温度検出器を
設け、上記温度検出器の温度が２００〜２５０℃以上に
上昇した時に、上記強制冷却用バイパスダクトに設けら
れている仕切りダンパを開放し、上記空気予熱器内に冷
却用空気を送入することを特徴とする空気予熱装置にお
ける異常昇温防止法。 ４、特許請求の範囲第３項記載の空気予熱装置における
異常昇温防止法において、温度検出器における温度が２
００〜２５０℃以上に上昇した時もしくは排ガス中のＳ
ＯｘまたはＣＯ濃度が設定の濃度以上に増加した時に、
強制冷却用バイパスダクトに設けられている仕切りダン
パを開放し、空気予熱器のヒーティングエレメント部へ
冷却用空気を送入することを特徴とする空気予熱装置に
おける異常昇温防止法。[Scope of Claims] 1. Combustion air supplied from a blower for supplying combustion air provided in the flue gas passage of the combustion furnace and the high temperature flue gas for combustion. In an air preheating device for a combustion furnace having an air preheater for preheating air, cooling air is supplied from the blower to the inside of the air preheater between the air outlet of the blower and the exhaust gas inlet of the air preheater. A bypass duct for forced cooling is provided as a passage for feeding, and a temperature detector for detecting an abnormal temperature rise is provided at at least one of the preheated air outlet section of the air preheater and the exhaust gas outlet section of the air preheater. Alternatively, a gas detector is provided at the temperature detector and the exhaust gas outlet of the air preheater to detect an abnormal value of SOx or Co concentration or both concentration in the exhaust gas, and the temperature detector and the gas detector are provided. A means is provided for opening a partition damper provided in the forced cooling bypass duct and feeding cooling air into the air preheater in response to an abnormal signal from one or both of the above. Air preheating device. 2. In the air preheating device according to claim 1, the blower for feeding cooling air into the forced cooling bypass duct is a separately arranged blower other than the blower for feeding combustion air. An air preheating device characterized by: 3. Air preheating, which preheats the combustion air by exchanging heat between the combustion air supplied from a combustion air blower installed in the combustion exhaust gas passage of the combustion furnace and the high-temperature combustion exhaust gas. A method for preventing an abnormal temperature rise in an air preheating device of a combustion furnace having an air preheater, the method of preventing an abnormal temperature rise in an air preheating device of a combustion furnace having a A forced cooling bypass duct is provided as a passage for feeding cooling air, and at least one of the preheated air outlet of the air preheater and the exhaust gas outlet of the air preheater is provided with a temperature at which an abnormal temperature rise is detected. A detector is provided, and when the temperature of the temperature detector rises to 200 to 250°C or higher, a partition damper provided in the forced cooling bypass duct is opened to send cooling air into the air preheater. A method for preventing abnormal temperature rise in an air preheating device characterized by 4. In the method for preventing abnormal temperature rise in an air preheating device according to claim 3, when the temperature at the temperature detector is 2.
When the temperature rises to 00 to 250℃ or higher or S in exhaust gas
When the Ox or CO concentration increases above the set concentration,
A method for preventing abnormal temperature rise in an air preheating device, which is characterized by opening a partition damper provided in a forced cooling bypass duct and sending cooling air to a heating element portion of an air preheating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1070686A JP2708104B2 (en) | 1989-03-24 | 1989-03-24 | Air preheating device and its abnormal temperature rise prevention method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1070686A JP2708104B2 (en) | 1989-03-24 | 1989-03-24 | Air preheating device and its abnormal temperature rise prevention method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02251008A true JPH02251008A (en) | 1990-10-08 |
| JP2708104B2 JP2708104B2 (en) | 1998-02-04 |
Family
ID=13438776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1070686A Expired - Fee Related JP2708104B2 (en) | 1989-03-24 | 1989-03-24 | Air preheating device and its abnormal temperature rise prevention method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2708104B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285422A (en) * | 2019-07-09 | 2019-09-27 | 象山泛海环保科技有限责任公司 | A kind of refuse disposal installation of controllable temperature |
| CN111271726A (en) * | 2020-03-20 | 2020-06-12 | 西安热工研究院有限公司 | An air preheater inlet and outlet flue gas-air heat exchange system |
-
1989
- 1989-03-24 JP JP1070686A patent/JP2708104B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285422A (en) * | 2019-07-09 | 2019-09-27 | 象山泛海环保科技有限责任公司 | A kind of refuse disposal installation of controllable temperature |
| CN111271726A (en) * | 2020-03-20 | 2020-06-12 | 西安热工研究院有限公司 | An air preheater inlet and outlet flue gas-air heat exchange system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2708104B2 (en) | 1998-02-04 |
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