JPH08189618A - Combustion air preheating method and apparatus for garbage incinerator - Google Patents
Combustion air preheating method and apparatus for garbage incineratorInfo
- Publication number
- JPH08189618A JPH08189618A JP7002309A JP230995A JPH08189618A JP H08189618 A JPH08189618 A JP H08189618A JP 7002309 A JP7002309 A JP 7002309A JP 230995 A JP230995 A JP 230995A JP H08189618 A JPH08189618 A JP H08189618A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- heat storage
- air
- combustion
- combustion air
- 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.)
- Pending
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
- Incineration Of Waste (AREA)
- Air Supply (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ごみ焼却炉における燃
焼空気予熱方法および装置に関する。FIELD OF THE INVENTION The present invention relates to a method and an apparatus for preheating combustion air in a refuse incinerator.
【０００２】[0002]
【従来の技術】従来、ごみ焼却設備において、焼却され
るごみは、他の燃料に対して多量の水分を含んでいるこ
とが多く、燃焼を良好に行うためには高温の燃焼空気が
必要で、炉内に導入する燃焼空気を予熱する空気予熱器
が装備されている。2. Description of the Related Art Conventionally, in refuse incineration facilities, refuse to be incinerated often contains a large amount of water with respect to other fuels, and high temperature combustion air is required for good combustion. , Equipped with an air preheater to preheat the combustion air introduced into the furnace.
【０００３】燃焼用の一次空気は、高温であればあるほ
どごみの乾燥も早く燃焼が良好に行われ、焼却灰中の未
燃分が減少する。しかし、空気予熱器の構造と経済性の
面から一次燃焼空気の温度は、ごみの低位発熱量が1000
kcal/kg 以下の場合は200 〜250 ℃に、ごみの低位発熱
量が1000〜2000kcal/kg の場合は150 ℃に、ごみの低位
発熱量が2500kcal/kg 以上の場合は20〜100 ℃にそれぞ
れ設定されている。The higher the temperature of the primary air for combustion, the faster the drying of the waste, and the better the combustion, the less the unburned content in the incinerated ash. However, from the viewpoint of the structure and economy of the air preheater, the temperature of the primary combustion air is 1000
If the calorific value is less than kcal / kg, the temperature is 200 to 250 ℃, the lower heating value of waste is 1000 to 2000 kcal / kg, the temperature is 150 ° C, and if the lower heating value of waste is 2500 kcal / kg or more, the temperature is 20 to 100 ° C. It is set.
【０００４】また空気予熱器の形式として、燃焼排ガス
により多管式熱交換器を介して加熱されるガス式と、ボ
イラの発生蒸気を利用して燃焼空気を予熱する蒸気式
と、バーナーにより燃焼される重油・ガスなどの高温の
燃焼ガスと混合させる直火式とがある。Further, as the type of air preheater, there are a gas type in which combustion exhaust gas is heated through a multi-tube heat exchanger, a steam type in which combustion air is preheated by utilizing steam generated by a boiler, and a burner is used in combustion. There is a direct fire type that mixes with high temperature combustion gas such as heavy oil and gas.
【０００５】[0005]
【発明が解決しようとする課題】しかし、上記のガス式
空気予熱器は、水噴射による排ガス冷却装置を採用して
ボイラを設置しない設備に多く採用されるものあるが、
高温の燃焼空気を得るには高温の排ガスを多管式熱交換
器を介して加熱する方法が一般的であり、高温の腐食性
ガスによる伝熱管の腐食の問題があった。また蒸気式空
気予熱器は、ボイラを設置する場合にのみ採用可能で、
休止と運転を所定時間毎に繰り返す准連続運転式で休止
時の露点腐食の問題でボイラが設けられない設備では採
用ができないとともに、蒸気式の経済的な上昇可能温度
は、飽和蒸気温度より20〜30℃低い温度までで、ごみ質
が悪い場合には他の形式と併用して燃焼空気を加熱する
必要があった。さらに直火式空気予熱器は、他の燃料を
必要として運転コストが高いという問題があった。However, although the above-mentioned gas type air preheater is often used in equipment which employs an exhaust gas cooling device by water injection and does not have a boiler,
In order to obtain high-temperature combustion air, a method of heating high-temperature exhaust gas through a multi-tube heat exchanger is generally used, and there is a problem of heat transfer tube corrosion due to high-temperature corrosive gas. Also, the steam type air preheater can be used only when installing a boiler,
It is a quasi-continuous operation type in which suspension and operation are repeated every predetermined time, so it cannot be used in equipment that does not have a boiler due to the problem of dew point corrosion during suspension, and the steam type economically possible temperature rise is 20% higher than the saturated steam temperature. Up to -30 ℃ lower temperature, if the quality of the waste was poor, it was necessary to heat the combustion air in combination with other types. Further, the direct-fire air preheater has a problem that another fuel is required and the operation cost is high.
【０００６】本発明は、上記問題点を解決して、運転コ
ストも安くつき、伝熱管の腐食の問題もなく、高温の燃
焼空気を得られるごみ焼却炉における燃焼空気予熱方法
および装置を提供することを目的とする。The present invention solves the above problems and provides a method and an apparatus for preheating combustion air in a refuse incinerator in which operating costs are low, there is no problem of corrosion of heat transfer tubes, and high temperature combustion air can be obtained. The purpose is to
【０００７】[0007]
【課題を解決するための手段】上記問題点を解決するた
めに本発明のごみ焼却炉における燃焼空気予熱方法は、
蓄熱媒体を収容した少なくとも一対の蓄熱体に、燃焼排
ガスと燃焼空気とを所定時間毎に交互に導入して、燃焼
排ガスの熱を蓄熱体の蓄熱媒体を介して燃焼空気を間接
的に加熱するものである。In order to solve the above problems, the method for preheating combustion air in a refuse incinerator of the present invention is
The combustion exhaust gas and the combustion air are alternately introduced into the at least one pair of heat storage bodies containing the heat storage medium at predetermined time intervals, and the heat of the combustion exhaust gas indirectly heats the combustion air via the heat storage medium of the heat storage body. It is a thing.
【０００８】またごみ焼却炉における燃焼空気予熱装置
は、蓄熱媒体を収容した少なくとも一対の蓄熱体と、ご
み焼却炉からの燃焼排ガスを排ガス制御手段を介して各
蓄熱体に導入および排出する排ガス導管と、燃焼空気を
空気制御手段を介して各蓄熱体に導入および排出し一次
燃焼空気としてごみ焼却炉に供給する燃焼空気導管と、
前記排ガス制御手段および空気制御手段を操作して各蓄
熱体に燃焼排ガスと燃焼空気とを所定時間毎に交互に供
給排出させる予熱制御装置とを具備したものである。Further, the combustion air preheating device in the refuse incinerator comprises at least a pair of heat storage bodies containing a heat storage medium, and an exhaust gas conduit for introducing and discharging combustion exhaust gas from the waste incinerator to each heat storage body via the exhaust gas control means. And a combustion air conduit that introduces and discharges combustion air into and from each heat storage body via the air control means and supplies the combustion air as primary combustion air to the refuse incinerator,
A preheating control device for operating the exhaust gas control means and the air control means to alternately supply and discharge the combustion exhaust gas and the combustion air to and from each heat storage body at predetermined time intervals.
【０００９】さらに上記構成において、蓄熱体を、ごみ
焼却炉の炉壁に燃焼室に連通して設置し、各蓄熱体の出
入口に、排ガス制御手段を設けたものである。Further, in the above structure, the heat storage body is installed on the furnace wall of the refuse incinerator so as to communicate with the combustion chamber, and the exhaust gas control means is provided at the inlet and outlet of each heat storage body.
【００１０】[0010]
【作用】上記構成において、燃焼排ガスにより加熱され
た蓄熱体の蓄熱媒体に、燃焼空気を接触させて予熱する
ので、伝熱管の高温腐食の問題もなく、炉下流側の排ガ
ス経路に排ガス冷却器を設置する場合には、冷却器の冷
却水量を減少させることができる。また高温の燃焼排ガ
スから熱回収できるので、高温の燃焼空気が得られ、た
とえば蒸気タービンへの呑み込み蒸気量を増加させるこ
とができる。さらに他の燃料を使用しない分、運転コス
トを低減することができる。In the above structure, since the combustion air is brought into contact with the heat storage medium of the heat storage body heated by the combustion exhaust gas to preheat it, there is no problem of hot corrosion of the heat transfer tube, and the exhaust gas cooler is provided in the exhaust gas passage on the downstream side of the furnace. When installing, the cooling water amount of the cooler can be reduced. Further, since heat can be recovered from the high temperature combustion exhaust gas, high temperature combustion air can be obtained and, for example, the amount of steam swallowed into the steam turbine can be increased. Since no other fuel is used, the operating cost can be reduced.
【００１１】また、蓄熱体を炉壁に燃焼室に連通して設
置することにより、燃焼室から直接高温の燃焼排ガスを
取り出して蓄熱媒体を加熱することができ、高い熱回収
量を確保できて、燃焼空気を高温に加熱することができ
る。Further, by installing the heat storage body on the furnace wall so as to communicate with the combustion chamber, it is possible to take out the high temperature combustion exhaust gas directly from the combustion chamber to heat the heat storage medium and to secure a high heat recovery amount. The combustion air can be heated to a high temperature.
【００１２】[0012]
【実施例】以下、本発明に係るごみ焼却設備の一実施例
を図面に基づいて説明する。ストーカ式ごみ焼却炉の炉
本体１には、上流側にごみ投入ホッパー２が設けられる
とともに、内部に傾斜式火格子３が設けられている。そ
して、入口がごみピット４に接続された空気導入管（燃
焼空気導管）５は蓄熱式空気予熱器６に接続されるとと
もに、この空気予熱器６に接続された空気供給管（燃焼
空気導管）７がウインドボックス８に接続され、予熱さ
れた一次燃焼空気は火格子３を介して燃焼室９に供給さ
れる。この炉本体１内の排ガス経路には水管群を備えた
ボイラ部１０が設置されており、ボイラ部１０から排出
される排ガスは、誘引ファン１３Ａにより排ガス管１１
を通って水噴射式排ガス冷却装置１２に導入され冷却さ
れた後、バグフィルター１３Ｂにより除塵され、さらに
煙突１４に排出される。また空気予熱器６の熱源となっ
た燃焼排ガスは、排ガス導管１５から排ガス管１１の排
ガス冷却装置１２上流側に接続されて排出される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the refuse incineration facility according to the present invention will be described below with reference to the drawings. The furnace body 1 of the stoker-type refuse incinerator is provided with a refuse input hopper 2 on the upstream side and an inclined grate 3 inside. The air introduction pipe (combustion air conduit) 5 whose inlet is connected to the dust pit 4 is connected to the regenerative air preheater 6 and the air supply pipe (combustion air conduit) connected to this air preheater 6. 7 is connected to a wind box 8, and the preheated primary combustion air is supplied to the combustion chamber 9 via the grate 3. A boiler unit 10 having a water pipe group is installed in the exhaust gas passage in the furnace body 1, and the exhaust gas discharged from the boiler unit 10 is exhausted by the induction fan 13A.
After being introduced into the water-injection-type exhaust gas cooling device 12 and cooled, the dust is removed by the bag filter 13B and further discharged to the chimney 14. Further, the combustion exhaust gas that has become the heat source of the air preheater 6 is connected to the exhaust gas pipe 15 upstream of the exhaust gas cooling device 12 and discharged from the exhaust gas pipe 15.
【００１３】前記蓄熱式空気予熱器６は、少なくとも一
対の第１，第２蓄熱体２１Ａ，２１Ｂを備えており、こ
れら第１，第２蓄熱体２１Ａ，２１Ｂは同一構成で、断
熱ボックス内に隙間を通して排ガスや空気を流送可能な
粒状の蓄熱媒体が収容され、この蓄熱媒体は、たとえば
アルミナを焼成して直径２０〜５０ｍｍのボール状に形
成されたものや、砕石状のアルミナ電鋳品で２０〜３０
ｍｍの不定形のものが使用される。The heat storage type air preheater 6 is provided with at least a pair of first and second heat storage bodies 21A and 21B, and these first and second heat storage bodies 21A and 21B have the same structure and are placed in an adiabatic box. A granular heat storage medium capable of sending exhaust gas or air through the gap is housed, and this heat storage medium is, for example, formed by firing alumina into a ball shape having a diameter of 20 to 50 mm, or a crushed stone electroformed alumina product. 20 ~ 30
An irregular shape of mm is used.
【００１４】これら第１，第２蓄熱体２１Ａ，２１Ｂ
は、燃焼室９の排ガスを排ガス導入管を介して導入して
もよいが、好ましくは炉本体１の炉壁に直接設置するこ
とにより、高温の排ガスを送る特別仕様の排ガス導入管
を省略してメンテナンスの軽減や設備コストおよびヒー
トロスの低減を図っている。These first and second heat storage bodies 21A and 21B
May introduce the exhaust gas of the combustion chamber 9 through the exhaust gas introduction pipe, but by directly installing it on the furnace wall of the furnace body 1, a special specification exhaust gas introduction pipe for sending high temperature exhaust gas is omitted. Reduce maintenance, equipment cost and heat loss.
【００１５】第１，第２蓄熱体２１Ａ，２１Ｂが設置さ
れる炉壁は、燃焼室９の前壁や後壁、側壁でもよいが、
この実施例では高温の燃焼排ガスが集中して送られる天
壁１ａに設けられている。すなわち、天壁１ａに形成さ
れた貫通孔２２Ａ，２２Ｂに断熱ボックスが取り付けら
れて第１，第２蓄熱体２１Ａ，２１Ｂが装着され、排ガ
スを導入する開口底部に排ガス制御手段の一例であるシ
ャッター式または開閉ダンパー式の第１，第２開閉装置
２３Ａ，２３Ｂがそれぞれ設けられている。The furnace wall on which the first and second heat storage bodies 21A and 21B are installed may be the front wall, the rear wall or the side wall of the combustion chamber 9.
In this embodiment, it is provided on the ceiling wall 1a to which the high temperature combustion exhaust gas is concentratedly sent. That is, a heat insulating box is attached to the through holes 22A and 22B formed in the ceiling wall 1a, the first and second heat storage bodies 21A and 21B are attached, and a shutter which is an example of an exhaust gas control means is provided at the bottom of the opening for introducing the exhaust gas. The first and second opening / closing devices 23A and 23B of the open type or the open / close damper type are respectively provided.
【００１６】これら第１，第２蓄熱体２１Ａ，２１Ｂに
は、空気導入管５から分岐されて空気制御手段の一例で
ある第１，第２空気制御弁２４Ａ，２４Ｂがそれぞれ介
在された第１，第２空気導入管５ａ，５ｂが接続され、
さらに空気制御手段の一例である第３，第４空気制御弁
２４Ｃ，２４Ｄがそれぞれ介在された第１，第２空気供
給管７ａ，７ｂ（燃焼空気導管）が合流して空気供給管
７に接続される。この空気供給管７には、空気押込送風
機２５が介在されるとともに、燃焼空気温度制御手段の
一例である調整用空気導入管２６と流量調整弁２７が設
けられている。すなわち、空気押込送風機２５の上流側
に空気導入管５から分岐された調整用空気導入管２６が
接続され、この調整用空気導入管２６に予熱前の一次燃
焼空気の流入量を調整して一次燃焼空気の予熱温度を調
整する流量調整弁２７が介在されている。この流量調整
弁２７は、空気供給管７内の一次燃焼空気の温度を検出
する温度検出器３１に検出信号に基づいて予熱制御装置
２８により操作され、第１蓄熱体２１Ａまたは第２蓄熱
体２１Ｂを通過して予熱された一次燃焼空気に低温の燃
焼空気を混合して、ウインドボックス８に供給する一次
燃焼空気の温度を調整することができる。The first and second heat storage bodies 21A and 21B are provided with first and second air control valves 24A and 24B which are branched from the air introduction pipe 5 and are an example of air control means. , The second air introduction pipes 5a, 5b are connected,
Furthermore, the first and second air supply pipes 7a and 7b (combustion air conduits) in which the third and fourth air control valves 24C and 24D, which are an example of air control means, are respectively joined and connected to the air supply pipe 7. To be done. An air pushing blower 25 is interposed in the air supply pipe 7, and an adjusting air introducing pipe 26 and a flow rate adjusting valve 27, which are examples of combustion air temperature control means, are provided. That is, the adjusting air introducing pipe 26 branched from the air introducing pipe 5 is connected to the upstream side of the air pushing blower 25, and the inflow amount of the primary combustion air before preheating is adjusted to the adjusting air introducing pipe 26 by adjusting the primary combustion air. A flow rate adjusting valve 27 for adjusting the preheating temperature of the combustion air is interposed. The flow rate adjusting valve 27 is operated by the preheat control device 28 based on the detection signal in the temperature detector 31 that detects the temperature of the primary combustion air in the air supply pipe 7, and the first heat storage body 21A or the second heat storage body 21B. It is possible to adjust the temperature of the primary combustion air supplied to the wind box 8 by mixing the low temperature combustion air with the primary combustion air that has been preheated through.
【００１７】また、これら第１，第２蓄熱体２１Ａ，２
１Ｂには、排ガス制御手段の一例である第１，第２排ガ
ス制御弁２９Ａ，２９Ｂが介在された第１，第２排ガス
導管１５ａ，１５ｂが接続されて合流され、排ガス誘引
ファン３０が介在された排ガス導管１５に接続されてい
る。Further, these first and second heat storage bodies 21A, 2
1B, the first and second exhaust gas conduits 15a and 15b in which the first and second exhaust gas control valves 29A and 29B, which are an example of exhaust gas control means, are connected are joined together, and the exhaust gas induction fan 30 is interposed. Connected to the exhaust gas conduit 15.
【００１８】前記予熱制御装置２８は、上記のように一
次燃焼空気の温度を制御するとともに、予め入力された
データに基づいて燃焼状態により、第１，第２開閉装置
２３Ａ，２３Ｂ、第１，第２排ガス制御弁２９Ａ，２９
Ｂおよび第１〜第４空気制御弁２４Ａ，２４Ｄを操作し
て、燃焼排ガスと一次燃焼空気とを所定時間毎に交互に
切り換えて第１，第２蓄熱体２１Ａ，２１Ｂに導入し、
一方の蓄熱媒体を加熱するとともに他方の蓄熱媒体によ
り一次燃焼空気を加熱してウインドボックス８に供給す
るように構成されている。The preheat control device 28 controls the temperature of the primary combustion air as described above, and the first and second opening / closing devices 23A and 23B, the first and second opening / closing devices 23A and 23B are controlled according to the combustion state based on the previously input data. Second exhaust gas control valves 29A, 29
B and the first to fourth air control valves 24A, 24D are operated to alternately switch the combustion exhaust gas and the primary combustion air at predetermined intervals to introduce the first and second heat storage bodies 21A, 21B.
It is configured to heat one heat storage medium and heat the primary combustion air by the other heat storage medium and supply the primary combustion air to the wind box 8.
【００１９】上記構成において、第１開閉装置２３Ａと
第１排ガス制御弁２９Ａ、第２，第４空気制御弁２４
Ｂ，２４Ｄが開で、第２開閉装置２３Ｂと第２排ガス制
御弁２９Ｂ、第１，第３空気制御弁２４Ａ，２４Ｃが閉
とすることにより、第１蓄熱体２１Ａに燃焼排ガスを導
入して蓄熱媒体を加熱し、第１排ガス導管１５ａおよび
排ガス導管１５を介して燃焼排ガスを排ガス管１１に排
出する。同時に、一次燃焼空気を空気導入管５および第
１空気導入管５ｂを介して第２蓄熱体２１Ｂに導入し、
蓄熱媒体により一次燃焼空気を予熱し、第２空気供給管
７ｂおよび空気供給管７を介して燃焼室９に一次燃焼空
気を供給する。この時温度検出器３１に検出信号に基づ
いて予熱制御装置２８により流量調整弁２７が操作され
一次燃焼空気の温度が制御される。In the above structure, the first opening / closing device 23A, the first exhaust gas control valve 29A, the second and fourth air control valves 24
B and 24D are opened, and the second switchgear 23B, the second exhaust gas control valve 29B, and the first and third air control valves 24A and 24C are closed to introduce combustion exhaust gas into the first heat storage body 21A. The heat storage medium is heated, and the combustion exhaust gas is discharged to the exhaust gas pipe 11 via the first exhaust gas conduit 15a and the exhaust gas conduit 15. At the same time, the primary combustion air is introduced into the second heat storage body 21B via the air introduction pipe 5 and the first air introduction pipe 5b,
The primary combustion air is preheated by the heat storage medium, and the primary combustion air is supplied to the combustion chamber 9 via the second air supply pipe 7b and the air supply pipe 7. At this time, based on the detection signal from the temperature detector 31, the preheat control device 28 operates the flow rate adjusting valve 27 to control the temperature of the primary combustion air.
【００２０】所定時間経過すると、予熱制御装置２８に
より操作されて、第１開閉装置２３Ａと第１排ガス制御
弁２９Ａ、第２，第４空気制御弁２４Ｂ，２４Ｄが閉
で、第２開閉装置２３Ｂと第２排ガス制御弁２９Ｂ、第
１，第３空気制御弁２４Ａ，２４Ｃが開とすることによ
り、第２蓄熱体２１Ｂに燃焼排ガスを導入して蓄熱媒体
を加熱し、第２排ガス導管１５ｂおよび排ガス導管１５
を介して燃焼排ガスを排ガス管１１に排出する。同時
に、空気導入管５および第１空気導入管５ａを介して第
１蓄熱体２１Ａに一次燃焼空気を導入し、蓄熱媒体によ
り一次燃焼空気を予熱し、第１空気供給管７ａおよび空
気供給管７を介して燃焼室９に一次燃焼空気を供給する
ができる。After a lapse of a predetermined time, the preheat control device 28 is operated to close the first opening / closing device 23A, the first exhaust gas control valve 29A, the second and fourth air control valves 24B and 24D, and the second opening / closing device 23B. By opening the second exhaust gas control valve 29B and the first and third air control valves 24A and 24C, the combustion exhaust gas is introduced into the second heat storage body 21B to heat the heat storage medium, and the second exhaust gas conduit 15b and Exhaust gas conduit 15
The combustion exhaust gas is discharged to the exhaust gas pipe 11 via the. At the same time, the primary combustion air is introduced into the first heat storage body 21A via the air introduction pipe 5 and the first air introduction pipe 5a, the primary combustion air is preheated by the heat storage medium, and the first air supply pipe 7a and the air supply pipe 7 are provided. The primary combustion air can be supplied to the combustion chamber 9 via the.
【００２１】上記実施例によれば、予熱制御装置２８よ
り第１，第２開閉装置２３Ａ，２３Ｂ、第１，第２排ガ
ス制御弁２９Ａ，２９Ｂおよび第１〜第４空気制御弁２
４Ａ，２４Ｄを操作して、第１蓄熱体２１Ａ，第２蓄熱
体２１Ｂに排ガスと一次燃焼空気とを交互に供給し、燃
焼排ガスにより加熱された第１蓄熱体２１Ａまたは第２
蓄熱体２１Ｂの蓄熱媒体に、燃焼空気を接触させて加熱
するので、伝熱管の高温腐食の問題もなく、炉下流側の
排ガス経路に排ガス冷却器を設置する場合には、排ガス
冷却器の冷却水量を減少させることができ、また高温の
燃焼排ガスから熱回収できて高温の燃焼空気が得られ、
たとえばボイラ部１０から蒸気が供給される蒸気タービ
ンへの呑み込み蒸気量を増加させることができ、さら
に、ごみ焼却炉において燃焼排ガスからの熱回収効率を
向上させることができるとともに、他の燃料を使用しな
い分運転コストを低減することができる。According to the above embodiment, the preheat control device 28 controls the first and second opening / closing devices 23A and 23B, the first and second exhaust gas control valves 29A and 29B, and the first to fourth air control valves 2.
4A, 24D is operated to alternately supply the exhaust gas and the primary combustion air to the first heat storage body 21A and the second heat storage body 21B, and the first heat storage body 21A or the second heat storage body 21A heated by the combustion exhaust gas.
Since the combustion air is brought into contact with the heat storage medium of the heat storage body 21B to heat the heat storage medium, there is no problem of high temperature corrosion of the heat transfer tube, and when the exhaust gas cooler is installed in the exhaust gas passage on the downstream side of the furnace, the exhaust gas cooler is cooled. The amount of water can be reduced, and heat can be recovered from high temperature combustion exhaust gas to obtain high temperature combustion air.
For example, the amount of swallowed steam to the steam turbine to which steam is supplied from the boiler unit 10 can be increased, and further, the efficiency of heat recovery from combustion exhaust gas in the refuse incinerator can be improved and other fuels can be used. As a result, the operating cost can be reduced.
【００２２】また、第１，第２蓄熱体２１Ａ，２１Ｂを
天壁１ａに貫通孔を介して設置したので、燃焼室９から
直接高温の燃焼排ガスを第１，第２蓄熱体５Ａ，２５Ｂ
に導入して蓄熱媒体を加熱することができ、高い熱回収
量を確保できて燃焼空気を高温に加熱することができ
る。Since the first and second heat storage bodies 21A and 21B are installed in the ceiling wall 1a through the through holes, the high temperature combustion exhaust gas is directly supplied from the combustion chamber 9 to the first and second heat storage bodies 5A and 25B.
It is possible to heat the heat storage medium by introducing it into the air conditioner, secure a high heat recovery amount, and heat the combustion air to a high temperature.
【００２３】なお、上記構成では、一対の蓄熱体２１
Ａ，２１Ｂを設置したが、もう１組一対の蓄熱体を設置
して、各組の蓄熱体を交互に使用し、休止中の蓄熱体に
パルスジェット（洗浄用脈動空気または蒸気）を吹き込
んで、排ガスで汚染された蓄熱媒体を洗浄するように構
成してもよい。In the above construction, the pair of heat storage bodies 21
Although A and 21B were installed, another pair of heat storage bodies was installed, and each set of heat storage bodies was used alternately, and a pulse jet (pulsating air or steam for cleaning) was blown into the resting heat storage bodies. The heat storage medium contaminated with the exhaust gas may be cleaned.
【００２４】また、ごみ焼却炉の形式は、ストーカ式に
限らず、流動床式など他の形式に適用することもでき
る。さらに、ボイラ部１０や水噴射式排ガス冷却装置１
２を設置しないごみ焼却炉にも適用することができる。The type of the refuse incinerator is not limited to the stoker type, but can be applied to other types such as a fluidized bed type. Furthermore, the boiler part 10 and the water injection type exhaust gas cooling device 1
It can also be applied to refuse incinerators that do not have 2 installed.
【００２５】[0025]
【発明の効果】以上に述べたごとく本発明によれば、燃
焼排ガスにより加熱された蓄熱体の蓄熱媒体に、燃焼空
気を接触させて予熱するので、従来のガス式空気予熱器
に比べて、伝熱管の高温腐食の問題もなく、炉下流側の
排ガス経路に排ガス冷却器を設置する場合には、排ガス
冷却器の冷却水量を減少させることができる。また蒸気
式空気予熱器に比べて、高温の燃焼排ガスから熱回収で
きて高温の燃焼空気が得られ、たとえば蒸気タービンへ
の呑み込み蒸気量を増加させることができる。さらに直
火式空気予熱器に比べて、他の燃料を使用しない分運転
コストを低減することができる。As described above, according to the present invention, since the combustion air is brought into contact with the heat storage medium of the heat storage body heated by the combustion exhaust gas to preheat it, compared with the conventional gas type air preheater, When the exhaust gas cooler is installed in the exhaust gas passage on the downstream side of the furnace without the problem of high temperature corrosion of the heat transfer tube, the amount of cooling water of the exhaust gas cooler can be reduced. Further, compared with the steam type air preheater, heat can be recovered from the high temperature combustion exhaust gas to obtain high temperature combustion air, and for example, the amount of steam swallowed into the steam turbine can be increased. Further, as compared with the direct-fire air preheater, the operating cost can be reduced because other fuel is not used.
【００２６】また、蓄熱体を炉壁に燃焼室に連通して設
置することにより、燃焼室から直接高温の燃焼排ガスを
取り出して蓄熱媒体を加熱することができ、高い熱回収
量を確保できて、燃焼空気を高温に加熱することができ
る。Further, by installing the heat storage body on the furnace wall so as to communicate with the combustion chamber, the high temperature combustion exhaust gas can be directly taken out from the combustion chamber to heat the heat storage medium, and a high heat recovery amount can be secured. The combustion air can be heated to a high temperature.
【図１】本発明に係るごみ焼却設備の一実施例を示す構
成図である。FIG. 1 is a configuration diagram showing an embodiment of a refuse incineration facility according to the present invention.
１ 炉本体 １ａ 天壁 ５ 空気導入管（燃焼空気導管） ５ａ，５ｂ 第１，第２空気導入管（燃焼空気導管） ６ 空気予熱器 ７ 空気供給管（燃焼空気導管） ７ａ，７ｂ 第１，第２空気供給管（燃焼空気導管） ８ ウインドボックス ９ 燃焼室 １５ 排ガス導管 ２１Ａ 第１蓄熱体 ２１Ｂ 第２蓄熱体 ２２Ａ，２２Ｂ 貫通孔 ２３Ａ 第１開閉装置（排ガス制御手段） ２３Ｂ 第２開閉装置（排ガス制御手段） ２４Ａ〜２４Ｄ 第１〜第４空気制御弁（空気制御手
段） ２５ 空気押込送風機 ２６ 調整瀬用空気導入管 ２７ 流量調整弁 ２８ 予熱制御装置 ２９Ａ ２９Ｂ 第１，第２排ガス制御弁（排ガス制御
手段） ３０ 排ガス誘引ファン ３１ 温度検出器1 Furnace Main Body 1a Top Wall 5 Air Inlet Pipe (Combustion Air Conduit) 5a, 5b 1st, 2nd Air Inlet Pipe (Combustion Air Conduit) 6 Air Preheater 7 Air Supply Pipe (Combustion Air Conduit) 7a, 7b 1st, 1st Second air supply pipe (combustion air conduit) 8 Windbox 9 Combustion chamber 15 Exhaust gas conduit 21A First heat storage body 21B Second heat storage body 22A, 22B Through hole 23A First switchgear (exhaust gas control means) 23B Second switchgear ( Exhaust gas control means) 24A to 24D First to fourth air control valves (air control means) 25 Air pushing blower 26 Air inlet pipe for adjusting current 27 Flow rate adjusting valve 28 Preheating control device 29A 29B First and second exhaust gas control valves ( Exhaust gas control means) 30 Exhaust gas induction fan 31 Temperature detector
Claims (3)
熱体に、燃焼排ガスと燃焼空気とを所定時間毎に交互に
導入して、燃焼排ガスの熱を蓄熱体の蓄熱媒体を介して
燃焼空気を間接的に加熱することを特徴とするごみ焼却
炉における燃焼空気予熱方法。1. A combustion exhaust gas and a combustion air are alternately introduced into at least a pair of heat storage bodies accommodating the heat storage medium at predetermined time intervals, and the heat of the combustion exhaust gas is transferred to the combustion air via the heat storage medium of the heat storage body. A method for preheating combustion air in a refuse incinerator characterized by indirectly heating.
熱体と、ごみ焼却炉からの燃焼排ガスを排ガス制御手段
を介して各蓄熱体に導入および排出する排ガス導管と、
燃焼空気を空気制御手段を介して各蓄熱体に導入および
排出し一次燃焼空気としてごみ焼却炉に供給する燃焼空
気導管と、前記排ガス制御手段および空気制御手段を操
作して各蓄熱体に燃焼排ガスと燃焼空気とを所定時間毎
に交互に供給排出させる予熱制御装置とを具備したこと
を特徴とするごみ焼却炉における燃焼空気予熱装置。2. At least a pair of heat storage bodies containing a heat storage medium, and an exhaust gas conduit for introducing and discharging combustion exhaust gas from a refuse incinerator to each heat storage body via an exhaust gas control means.
Combustion air conduit for introducing and discharging combustion air to and from each heat storage body through the air control means and supplying it to the refuse incinerator as primary combustion air, and operating the exhaust gas control means and air control means to generate combustion exhaust gas for each heat storage body And a combustion air preheating control device for alternately supplying and discharging combustion air every predetermined time.
連通して設置し、各蓄熱体の出入口に、排ガス制御手段
を設けたことを特徴とする請求項２記載のごみ焼却炉に
おける燃焼空気予熱装置。3. The waste incineration system according to claim 2, wherein the heat storage body is installed on the furnace wall of the waste incinerator so as to communicate with the combustion chamber, and exhaust gas control means is provided at the inlet and outlet of each heat storage body. Combustion air preheater in a furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7002309A JPH08189618A (en) | 1995-01-11 | 1995-01-11 | Combustion air preheating method and apparatus for garbage incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7002309A JPH08189618A (en) | 1995-01-11 | 1995-01-11 | Combustion air preheating method and apparatus for garbage incinerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08189618A true JPH08189618A (en) | 1996-07-23 |
Family
ID=11525760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7002309A Pending JPH08189618A (en) | 1995-01-11 | 1995-01-11 | Combustion air preheating method and apparatus for garbage incinerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08189618A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013064584A (en) * | 2011-09-16 | 2013-04-11 | Yu Po Lee | Heat recovery system of high-temperature exhaust |
| CN113008042A (en) * | 2021-04-15 | 2021-06-22 | 新余钢铁股份有限公司 | Preheater protection structure for heating furnace and using method thereof |
-
1995
- 1995-01-11 JP JP7002309A patent/JPH08189618A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013064584A (en) * | 2011-09-16 | 2013-04-11 | Yu Po Lee | Heat recovery system of high-temperature exhaust |
| CN113008042A (en) * | 2021-04-15 | 2021-06-22 | 新余钢铁股份有限公司 | Preheater protection structure for heating furnace and using method thereof |
| CN113008042B (en) * | 2021-04-15 | 2023-04-18 | 新余钢铁股份有限公司 | Preheater protection structure for heating furnace and use method thereof |
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