JPH11173539A - Exhaust gas treatment system for waste incinerator - Google Patents
Exhaust gas treatment system for waste incineratorInfo
- Publication number
- JPH11173539A JPH11173539A JP9362127A JP36212797A JPH11173539A JP H11173539 A JPH11173539 A JP H11173539A JP 9362127 A JP9362127 A JP 9362127A JP 36212797 A JP36212797 A JP 36212797A JP H11173539 A JPH11173539 A JP H11173539A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- temperature
- bag filter
- pressure boiler
- pressure
- 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
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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Chimneys And Flues (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は廃棄物焼却炉からの
排ガスをバグフィルタを通して処理するように構成され
た排ガス処理システムに関する。The present invention relates to an exhaust gas treatment system configured to treat exhaust gas from a waste incinerator through a bag filter.
【０００２】[0002]
【従来の技術】図３〜図４は従来技術に係る廃棄物焼却
炉の排ガス処理システムを示し、図３はその全体の構成
図、図４はブロック図である。図３〜図４において、１
は焼却炉で、ホッパ１３を介して投入される廃棄物（以
下ごみという）を焼却する。１６は該焼却炉１からの燃
焼排ガスが通流する排ガス管、２は該燃焼排ガスからの
熱を受けて蒸気を発生する高温高圧ボイラ即ち廃熱回収
ボイラである。１２は高圧タービンで、前記高温高圧ボ
イラ２の蒸気出口と高圧蒸気管２１により接続されてい
る。８は、該高圧タービン１２に直結駆動される発電機
である。2. Description of the Related Art FIGS. 3 and 4 show an exhaust gas treatment system for a waste incinerator according to the prior art. FIG. 3 is an overall configuration diagram and FIG. 4 is a block diagram. 3 and 4, 1
Is an incinerator for incinerating waste (hereinafter referred to as refuse) input through the hopper 13. Reference numeral 16 denotes an exhaust gas pipe through which the combustion exhaust gas from the incinerator 1 flows, and reference numeral 2 denotes a high-temperature and high-pressure boiler that receives heat from the combustion exhaust gas to generate steam, that is, a waste heat recovery boiler. A high-pressure turbine 12 is connected to a steam outlet of the high-temperature high-pressure boiler 2 by a high-pressure steam pipe 21. Reference numeral 8 denotes a generator directly connected to the high-pressure turbine 12.
【０００３】また、１１は排ガス温度を降下させるため
の減温装置、４は排ガス中の飛灰等の固粉除去用のバグ
フィルタ、１７は前記高温高圧ボイラ２の排ガス出口と
前記減温装置１１とを接続する排ガス管、１８は該減温
装置１１の出口と前記バグフィルタ４とを接続する排ガ
ス管である。また１４は排ガス中のＮＯｘ（窒素酸化
物）を除去するＮＯｘ処理装置、１９は前記バグフィル
タ４と該ＮＯｘ処理装置１４とを接続する排ガス管、１
５は煙突、２０は吸引式のブロワである。[0003] Reference numeral 11 denotes a temperature reducing device for lowering the temperature of exhaust gas, 4 denotes a bag filter for removing solid powder such as fly ash in the exhaust gas, and 17 denotes an exhaust gas outlet of the high-temperature and high-pressure boiler 2 and the temperature reducing device. Reference numeral 18 denotes an exhaust gas pipe connecting the outlet of the temperature reducing device 11 and the bag filter 4. Reference numeral 14 denotes a NOx processing device for removing NOx (nitrogen oxides) in exhaust gas, 19 denotes an exhaust gas pipe connecting the bag filter 4 and the NOx processing device 14, 1
5 is a chimney, 20 is a suction blower.
【０００４】かかる廃棄物焼却炉の運転時において、ホ
ッパ１３を介して投入されたごみは焼却炉１において燃
焼用空気との共働によって燃焼せしめられる。該燃焼炉
１からの燃焼排ガスは排ガス管１６を経て高温高圧ボイ
ラ２に導かれる。この排ガス温度は図４に示すように８
５０℃〜９５０℃程度である。高温高圧ボイラ２におい
ては、この排ガスにより給水を加熱して高温・高圧の蒸
気を発生する。該高温高圧ボイラ２における圧力×温度
レベルは、通常３０ａｔａ×３００℃〜１００ａｔａ×
５００℃程度である。前記高温高圧ボイラ２にて蒸気を
発生することにより熱回収されたガスは図４に示すよう
に２２０℃〜２４０℃程度の温度レベルに降下する。During the operation of such a waste incinerator, the refuse introduced through the hopper 13 is burned in the incinerator 1 in cooperation with the combustion air. The combustion exhaust gas from the combustion furnace 1 is guided to the high-temperature and high-pressure boiler 2 via the exhaust gas pipe 16. This exhaust gas temperature was 8 as shown in FIG.
It is about 50 ° C to 950 ° C. In the high-temperature and high-pressure boiler 2, feed water is heated by the exhaust gas to generate high-temperature and high-pressure steam. The pressure × temperature level in the high-temperature high-pressure boiler 2 is usually 30ata × 300 ° C. to 100ata ×
It is about 500 ° C. The gas recovered by heat generation by generating steam in the high-temperature and high-pressure boiler 2 falls to a temperature level of about 220 ° C. to 240 ° C. as shown in FIG.
【０００５】この排ガスを飛灰等の各種固形物質を除去
するためのバグフィルタ４に導入する際においては、該
バグフィルタ４の作動及び耐久性から、その入口排ガス
温度を１５０℃〜１６０℃に降下させることを要する。
このため前記バグフィルタ４の排ガス上流側に減温装置
１１を設けている。該減温装置１１においては、排ガス
中に水又はスラリーを噴霧して排ガス温度を上記温度
（１５０℃〜１６０℃）に降下させる。なお、前記噴霧
式の減温装置１１に代えて反応蒸発器を用いて減温して
もよい。When the exhaust gas is introduced into the bag filter 4 for removing various solid substances such as fly ash, the temperature of the exhaust gas at the inlet is set to 150 ° C. to 160 ° C. due to the operation and durability of the bag filter 4. It needs to be lowered.
Therefore, a temperature reducing device 11 is provided on the exhaust gas upstream side of the bag filter 4. In the temperature reducing device 11, water or slurry is sprayed into the exhaust gas to lower the temperature of the exhaust gas to the above temperature (150 ° C to 160 ° C). The temperature may be reduced by using a reaction evaporator instead of the spray-type temperature reducing device 11.
【０００６】前記減温装置１１（あるいは反応蒸発器）
は、それ自体が温度調整機能を備えており、該減温装置
１１にて前記温度（１５０℃〜１６０℃）に正しく調整
された排ガスはバグフィルタ４に入り、該バグフィルタ
４においては、前記のように排ガス中の有害物質の濃度
を低減する。該バグフィルタ４から導出された排ガスは
排ガス管１９を通ってＮＯｘ処理装置１４に導かれ、こ
こで脱硝触媒等によりＮＯｘ（窒素酸化物）が除去ある
いは低減される。ＮＯｘ低減処理後の排ガスは吸引式の
ブロワ２０に吸引され、煙突１５から大気中に排出され
る。[0006] The temperature reducing device 11 (or reaction evaporator)
Has a temperature adjusting function itself, and the exhaust gas correctly adjusted to the temperature (150 ° C. to 160 ° C.) by the temperature reducing device 11 enters the bag filter 4. And reduce the concentration of harmful substances in the exhaust gas. The exhaust gas derived from the bag filter 4 is guided to the NOx processing device 14 through an exhaust gas pipe 19, where NOx (nitrogen oxide) is removed or reduced by a denitration catalyst or the like. The exhaust gas after the NOx reduction processing is sucked by the suction blower 20 and discharged from the chimney 15 into the atmosphere.
【０００７】一方、前記高圧ボイラ２にて発生した高温
・高圧の蒸気は高圧蒸気管２１により高圧の蒸気タービ
ン（高圧タービン）１２に送られてこれを駆動する。こ
れにより、焼却炉１からの排ガスのエネルギ（熱量）を
高圧タービン１２に駆動エネルギとして回収することが
できる。On the other hand, the high-temperature and high-pressure steam generated in the high-pressure boiler 2 is sent to a high-pressure steam turbine (high-pressure turbine) 12 by a high-pressure steam pipe 21 to drive it. Thereby, the energy (heat amount) of the exhaust gas from the incinerator 1 can be recovered to the high-pressure turbine 12 as drive energy.
【０００８】[0008]
【発明が解決しようとする課題】図３〜図４に示す従来
技術に係る排ガス処理システムにあっては、バグフィル
タ４へ導入する排ガス温度を低下させるため、水あるい
はスラリー噴霧式の減温装置１１を設け、該減温装置１
１において、排ガス中に水あるいはスラリーを噴霧して
いる。このため、かかる従来技術においては、減温装置
１１内において前記水あるいはスラリーの噴霧により排
ガス量が増加するとともに、排ガス中の水分率が増加
し、これによって白煙の発生後流側に設けられる洗煙塔
の余剰水の増加等の問題点の発生をみる。In the exhaust gas treatment system according to the prior art shown in FIGS. 3 and 4, in order to lower the temperature of the exhaust gas introduced into the bag filter 4, a water or slurry spray type temperature reducing device is used. 11 and the temperature reducing device 1
In 1, water or slurry is sprayed into the exhaust gas. For this reason, in the prior art, the amount of exhaust gas is increased by spraying the water or the slurry in the temperature reducing device 11 and the moisture content in the exhaust gas is increased, whereby the exhaust gas is provided on the downstream side after the generation of white smoke. The occurrence of problems such as an increase in surplus water in the smoke tower will be observed.
【０００９】また、前記排ガス中の水分率の増大により
プラントの熱回収率が低下し、プラント熱効率の低下を
みるという問題点もある。There is also a problem that the heat recovery rate of the plant is reduced due to an increase in the water content in the exhaust gas, and the thermal efficiency of the plant is reduced.
【００１０】本発明は前記従来技術の課題に鑑み、バグ
フィルタ入口の排ガスを水分の増大無くして所要温度に
降温させるとともに、該温度降下に伴なうエネルギを回
収して、前記水分率増大による白煙発生等の不具合の発
生を防止し、さらにプラントの熱回収効率を上昇させて
プラントの熱効率を向上させた廃棄物焼却炉の排ガス処
理システムを提供することを目的とする。In view of the above-mentioned problems of the prior art, the present invention reduces the temperature of the exhaust gas at the inlet of the bag filter to a required temperature without increasing the water content, recovers the energy associated with the temperature drop, and increases the water content. It is an object of the present invention to provide an exhaust gas treatment system for a waste incinerator, which prevents problems such as white smoke from occurring and further increases the heat recovery efficiency of the plant to improve the heat efficiency of the plant.
【００１１】[0011]
【課題を解決するための手段】本発明はかかる課題を解
決するため、その第１発明として、廃棄物焼却炉からの
排ガスをバグフィルタを通して処理するように構成され
た廃棄物焼却炉の排ガス処理システムであって、前記焼
却炉とバグフィルタとの間に、該焼却炉からの排ガスに
より高圧蒸気を発生する高圧ボイラと該高圧ボイラを経
た排ガスにより低圧蒸気を発生する低圧ボイラとを直列
に配設したことを特徴とする廃棄物焼却炉の排ガス処理
システムを提案する。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides, as a first invention, exhaust gas treatment of a waste incinerator configured to treat exhaust gas from a waste incinerator through a bag filter. A system, in which a high-pressure boiler that generates high-pressure steam by exhaust gas from the incinerator and a low-pressure boiler that generates low-pressure steam by exhaust gas passing through the high-pressure boiler are arranged in series between the incinerator and the bag filter. We propose an exhaust gas treatment system for a waste incinerator, which is characterized in that it is installed.
【００１２】また第２発明は、第１発明に加えて、前記
高圧ボイラの発生蒸気及び低圧ボイラの発生蒸気により
駆動される混気タービンを備えてなる。[0012] The second invention further includes, in addition to the first invention, an air-fuel mixture turbine driven by the steam generated by the high-pressure boiler and the steam generated by the low-pressure boiler.
【００１３】かかる発明によれば、高圧ボイラで高温高
圧蒸気を発生させた後の排ガスは低圧ボイラに導入さ
れ、該低圧ボイラにおいて給水と熱交換することにより
低圧蒸気を発生させてバグフィルタ入口の所要温度まで
降温されてバグフィルタに導入される。一方低圧ボイラ
にて発生した低圧蒸気は混気タービンに送られ、前記高
圧ボイラにて発生した高温・高圧蒸気との併用により該
混気タービンを駆動し、あるいはヒータ等他の低圧蒸気
使用先に送られて熱回収がなされる。According to the invention, the exhaust gas after the high-pressure boiler has generated the high-temperature and high-pressure steam is introduced into the low-pressure boiler. The temperature is lowered to the required temperature and introduced into the bag filter. On the other hand, the low-pressure steam generated in the low-pressure boiler is sent to the air-fuel mixture turbine, and the low-pressure steam is driven in combination with the high-temperature and high-pressure steam generated in the high-pressure boiler, or to another low-pressure steam destination such as a heater. The heat is sent for heat recovery.
【００１４】従って、かかる発明によれば低圧ボイラに
おいて高圧ボイラにて熱回収され降温された排ガスによ
って給水を加熱して、蒸気を発生させることにより排ガ
ス温度を降下させるので、従来技術のような排ガス中の
水分の増加が皆無となり、かかる水分率の増大による白
煙発生、洗煙塔余剰水の増加等の不具合の発生が防止さ
れる。Therefore, according to the present invention, in the low-pressure boiler, the feedwater is heated by the exhaust gas whose temperature has been recovered and cooled by the high-pressure boiler, and the temperature of the exhaust gas is lowered by generating steam. There is no increase in the water content, and problems such as the generation of white smoke and the increase of surplus water in the smoke wash tower due to the increase in the water content are prevented.
【００１５】また高圧ボイラに続いて低圧ボイラにて排
ガス熱をさらに回収するので、バグフィルタにおける有
害物質の除去機能を従来技術と同等に保持しつつ、プラ
ントの熱回収率が上昇せしめられ、プラントの熱効率が
向上する。Further, since the exhaust gas heat is further recovered by the low-pressure boiler following the high-pressure boiler, the heat recovery rate of the plant is increased while the function of removing harmful substances in the bag filter is maintained at the same level as in the prior art. The thermal efficiency is improved.
【００１６】[0016]
【発明の実施の形態】以下、図面を参照して本発明の好
適な実施形態を例示的に詳しく説明する。但しこの実施
形態に記載されている構成部品の寸法、材質、形状、そ
の相対的配置等は特に特定的な記載がないかぎりは、こ
の発明の範囲をそれに限定する趣旨ではなく、単なる説
明例にすぎない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.
【００１７】図１は本発明の実施形態に係る廃棄物焼却
炉の排ガス処理システムの全体構成図、図２はこれのブ
ロック図である。図１〜図２において、１は焼却炉で、
ホッパ１３を介して投入される廃棄物（以下ごみとい
う）を燃焼用空気との共働によって焼却する。１６は該
焼却炉１から燃焼排ガスが通流する排ガス管、２は該燃
焼排ガスからの熱を受けて蒸気を発生する高温高圧ボイ
ラ即ち廃熱回収ボイラである。FIG. 1 is an overall configuration diagram of an exhaust gas treatment system for a waste incinerator according to an embodiment of the present invention, and FIG. 2 is a block diagram of the system. 1 and 2, 1 is an incinerator,
Waste (hereinafter referred to as refuse) input through the hopper 13 is incinerated in cooperation with combustion air. Reference numeral 16 denotes an exhaust gas pipe through which the combustion exhaust gas flows from the incinerator 1, and reference numeral 2 denotes a high-temperature and high-pressure boiler that generates steam by receiving heat from the combustion exhaust gas, that is, a waste heat recovery boiler.
【００１８】４は排ガス中の飛灰等の除去用のバグフィ
ルタ、１４は排ガス中のＮＯｘ（窒素酸化物）を除去す
るＮＯｘ処理装置、１９は前記バグフィルタ４とＮＯｘ
処理装置１４とを接続する排ガス管、１５は煙突、２０
は吸引式のブロワである。以上の構成は図３〜図４に示
す従来技術と同様である。4 is a bag filter for removing fly ash and the like in the exhaust gas, 14 is a NOx processing device for removing NOx (nitrogen oxide) in the exhaust gas, and 19 is the bag filter 4 and the NOx.
Exhaust gas pipe for connecting to the processing device 14, 15 for chimney, 20
Is a suction blower. The above configuration is the same as that of the prior art shown in FIGS.
【００１９】本発明は、バグフィルタ入口の排ガスの低
温手段の改良に係るものである。The present invention relates to an improvement in means for lowering the temperature of exhaust gas at the inlet of a bag filter.
【００２０】即ちその実施形態を示す図１〜図２におい
て、前記高温高圧ボイラ２とバグフィルタ４との間の排
ガス管路には温度調整機能を有する低圧ボイラ３が設置
されている。１７は前記高温高圧ボイラ２と該低圧ボイ
ラ３とを接続する排ガス管、１８は該低圧ボイラ３とバ
グフィルタ４とを接続する排ガス管である。また７は混
気タービンで、該混気タービン７には高温高圧ボイラ２
で発生した蒸気が高圧蒸気管２１を介して導入されると
ともに、前記低圧ボイラ３で発生した低圧蒸気が低圧蒸
気管２２を介して導入されている。８は前記混気タービ
ン７に直結駆動される発電機である。That is, in FIGS. 1 and 2 showing the embodiment, a low-pressure boiler 3 having a temperature adjusting function is installed in an exhaust gas line between the high-temperature and high-pressure boiler 2 and the bag filter 4. Reference numeral 17 denotes an exhaust gas pipe for connecting the high-temperature and high-pressure boiler 2 to the low-pressure boiler 3, and reference numeral 18 denotes an exhaust gas pipe for connecting the low-pressure boiler 3 to the bag filter 4. Reference numeral 7 denotes an air-fuel mixture turbine.
Is introduced through a high-pressure steam pipe 21, and low-pressure steam generated in the low-pressure boiler 3 is introduced through a low-pressure steam pipe 22. Reference numeral 8 denotes a generator directly connected to the air-fuel mixture turbine 7.
【００２１】かかる構成からなる排ガス処理システムを
備えた廃棄物焼却炉の運転時において、ホッパ１３を介
して投入されたごみは焼却炉１において燃焼用空気との
共働によって燃焼せしめられる。該焼却炉１からの燃焼
排ガスは排ガス管１６を経て高温・高圧ボイラ２に導か
れる。この排ガス温度は図２に示すように８５０℃〜９
５０℃程度である。During the operation of the waste incinerator provided with the exhaust gas treatment system having the above-mentioned configuration, the refuse introduced through the hopper 13 is burned in the incinerator 1 in cooperation with the combustion air. The combustion exhaust gas from the incinerator 1 is guided to the high-temperature and high-pressure boiler 2 via the exhaust gas pipe 16. This exhaust gas temperature is 850 ° C. to 9 as shown in FIG.
It is about 50 ° C.
【００２２】高温高圧ボイラ２においては、この排ガス
により給水を加熱して高温・高圧の蒸気を発生する。該
高温高圧ボイラ２における圧力×温度レベルは、通常３
０ａｔａ×３００℃〜１００ａｔａ×５００℃程度であ
る。前記高温高圧ボイラ２にて蒸気を発生することによ
り熱回収された排ガスは図２に示すように２２０℃〜２
４０℃程度の温度レベルに降下する。In the high-temperature and high-pressure boiler 2, the exhaust gas heats the feed water to generate high-temperature and high-pressure steam. The pressure × temperature level in the high-temperature high-pressure boiler 2 is usually 3
It is about 0 at × 300 ° C. to 100 at × 500 ° C. Exhaust gas recovered by heat generation by generating steam in the high-temperature and high-pressure boiler 2 has a temperature of 220 ° C. to 2 ° C. as shown in FIG.
The temperature drops to a temperature level of about 40 ° C.
【００２３】この排ガスは、排ガス管１７を通って低圧
ボイラ３に導入される。該低圧ボイラ３においては、排
ガスによりボイラ給水を加熱して低圧の蒸気を発生せし
める。これにより、低圧ボイラ３出口の排ガス温度は、
図２に示すように、その温度調整手段（不図示）によっ
て１５０℃〜１６０℃に降温され、バグフィルタ４の作
動及び耐久性の面からの所要入口温度となる。前記低圧
ボイラ３にて前記温度（１５０℃〜１６０℃）に正しく
調整された排ガスはバグフィルタ４に入る。該バグフィ
ルタ４においては、前記のように排ガス中の有害物質の
濃度を低減する。This exhaust gas is introduced into the low-pressure boiler 3 through an exhaust gas pipe 17. In the low-pressure boiler 3, the boiler feedwater is heated by the exhaust gas to generate low-pressure steam. Thereby, the exhaust gas temperature at the outlet of the low-pressure boiler 3 becomes
As shown in FIG. 2, the temperature is lowered to 150 ° C. to 160 ° C. by the temperature adjusting means (not shown), and the required inlet temperature is obtained from the viewpoint of the operation and durability of the bag filter 4. The exhaust gas correctly adjusted to the temperature (150 ° C. to 160 ° C.) by the low-pressure boiler 3 enters the bag filter 4. In the bag filter 4, the concentration of harmful substances in the exhaust gas is reduced as described above.
【００２４】該バグフィルタ４から導出された排ガスは
排ガス管１９を通ってＮＯｘ処理装置１４に導かれ、こ
こで脱硝触媒等によりＮＯｘ（窒素酸化物）が除去ある
いは低減される。ＮＯｘ低減処理後の排ガスは吸引式の
ブロワ２０に吸引され、煙突１５から大気中に排出され
る。The exhaust gas led out from the bag filter 4 is guided to the NOx treatment device 14 through the exhaust gas pipe 19, where NOx (nitrogen oxide) is removed or reduced by a denitration catalyst or the like. The exhaust gas after the NOx reduction processing is sucked by the suction blower 20 and discharged from the chimney 15 into the atmosphere.
【００２５】一方、前記高温高圧ボイラ２にて発生した
前記圧力・温度レベルの高温・高圧蒸気は高圧蒸気管２
１により混気タービン７に送られ、また前記低圧ボイラ
３にて発生した低温低圧蒸気も低圧蒸気管２２により前
記混気タービン７に送られ、該混気タービン７は前記高
温高圧蒸気と、低温低圧蒸気との併用により運転され
る。On the other hand, the high-temperature and high-pressure steam generated at the high-temperature and high-pressure boiler 2 at the pressure and temperature level is supplied to the high-pressure steam pipe 2.
1, the low-temperature low-pressure steam generated in the low-pressure boiler 3 is also sent to the air-fuel mixture turbine 7 by a low-pressure steam pipe 22, and the air-fuel mixture turbine 7 Operated in combination with low pressure steam.
【００２６】これにより、焼却炉１からの排ガスのエネ
ルギ（熱量）を高温高圧ボイラ２で回収し、さらにその
後流においても低圧ボイラ３にて回収して混気タービン
７の駆動源とすることができることとなり、バグフィル
タ４における有害物質の除去機能を保持しつつ、排ガス
の熱回収率が上昇するとともに、発電機効率が上昇し、
プラントの熱効率を向上することができる。Thus, the energy (calorific value) of the exhaust gas from the incinerator 1 is recovered by the high-temperature and high-pressure boiler 2, and is also recovered by the low-pressure boiler 3 in the subsequent flow to be used as a drive source of the air-fuel mixture turbine 7. As a result, while maintaining the function of removing harmful substances in the bag filter 4, the heat recovery rate of the exhaust gas increases, and the generator efficiency increases.
The thermal efficiency of the plant can be improved.
【００２７】尚、前記低圧ボイラ３にて発生した低圧蒸
気をヒータ等、他の低圧蒸気使用先に送って利用するこ
とも可能である。この場合は、前記混気タービン７に代
えて、図３〜図４に示す通常の蒸気タービン１２を設置
してもよい。The low-pressure steam generated in the low-pressure boiler 3 can be sent to another low-pressure steam destination such as a heater for use. In this case, a normal steam turbine 12 shown in FIGS. 3 and 4 may be installed instead of the air-fuel mixture turbine 7.
【００２８】また、かかる実施形態において、低圧ボイ
ラ３にて、エレメント内のボイラ給水と排ガスとを熱交
換させることにより、排ガス温度を降温するので、従来
技術のように、排ガス中に水が混入することがなく、排
ガス中の水分率を低く保持できるとともに排ガス量の増
加が無く、従って、従来技術のような、排ガス中の水分
率の上昇による白煙の発生を防止でき、またバグフィル
タ４の後流に洗煙設備を設置した場合には減温余剰水の
減少も達成され環境負荷が低減できる。In this embodiment, the exhaust gas temperature is lowered by exchanging heat between the boiler feed water in the element and the exhaust gas in the low-pressure boiler 3, so that water is mixed in the exhaust gas as in the prior art. Therefore, the water content in the exhaust gas can be kept low and the amount of the exhaust gas does not increase. Therefore, the generation of white smoke due to the increase in the water content in the exhaust gas as in the prior art can be prevented. When a smoke washing facility is installed in the downstream of the facility, the reduction of the temperature-reducing surplus water is also achieved, and the environmental load can be reduced.
【００２９】[0029]
【発明の効果】以上記載のごとく、本発明によれば、低
圧ボイラにおいて、高圧ボイラにて熱回収され降温され
た排ガスによって給水を加熱して蒸気を発生させること
により排ガス温度を降下させるので、従来技術のような
排ガス中の水分の増加が皆無となり、かかる水分率の増
大による白煙発生、洗煙塔余剰水の増加等の不具合の発
生が防止される。As described above, according to the present invention, in a low-pressure boiler, heat is recovered by a high-pressure boiler, and the temperature of the exhaust gas is lowered by heating the feed water with the cooled exhaust gas to generate steam. There is no increase in the water content in the exhaust gas as in the prior art, and problems such as the generation of white smoke and the increase of surplus water in the smoke wash tower due to the increase in the water content are prevented.
【００３０】また高圧ボイラに続いて低圧ボイラにて排
ガス熱をさらに回収するので、バグフィルタでの有害物
質の除去機能を保持しつつ、プランドの熱回収率が上昇
せしめられ、これによってプラントの熱効率を向上する
ことができる。Further, since the exhaust gas heat is further recovered by the low-pressure boiler following the high-pressure boiler, the heat recovery rate of the plunge is increased while maintaining the function of removing harmful substances by the bag filter, thereby increasing the thermal efficiency of the plant. Can be improved.
【図１】本発明の実施形態に係る廃棄物焼却炉の排ガス
処理システムの全体構成図である。FIG. 1 is an overall configuration diagram of an exhaust gas treatment system for a waste incinerator according to an embodiment of the present invention.
【図２】前記実施形態におけるブロック図である。FIG. 2 is a block diagram in the embodiment.
【図３】従来技術を示す図１に対応する図である。FIG. 3 is a diagram corresponding to FIG. 1 showing a conventional technique.
【図４】従来技術を示す図２に対応する図である。FIG. 4 is a diagram corresponding to FIG. 2 showing a conventional technique.
１ 焼却炉 ２ 高温高圧ボイラ ３ 低圧ボイラ ４ バグフィルタ ７ 混気タービン ８ 発電機 １３ ホッパ １４ ＮＯｘ処理装置 １５ 煙突 １６、１７、１８、１９ 排ガス管 ２０ ブロワ ２１ 高圧蒸気管 ２２ 低圧蒸気管 REFERENCE SIGNS LIST 1 incinerator 2 high-temperature high-pressure boiler 3 low-pressure boiler 4 bag filter 7 air-fuel mixture turbine 8 generator 13 hopper 14 NOx processing device 15 chimney 16, 17, 18, 19 exhaust gas pipe 20 blower 21 high-pressure steam pipe 22 low-pressure steam pipe
Claims (2)
タを通して処理するように構成された排気物焼却炉の排
ガス処理システムにおいて、 前記焼却炉とバグフィルタとの間に、該焼却炉からの排
ガスにより高圧蒸気を発生する高圧ボイラと該高圧ボイ
ラを経た排ガスにより低圧蒸気を発生する低圧ボイラと
を直列に配設したことを特徴とする廃棄物焼却炉の排ガ
ス処理システム。An exhaust gas treatment system for an exhaust incinerator configured to treat exhaust gas from a waste incinerator through a bag filter, wherein an exhaust gas from the incinerator is disposed between the incinerator and the bag filter. An exhaust gas treatment system for a waste incinerator, comprising a high pressure boiler for generating high pressure steam and a low pressure boiler for generating low pressure steam by exhaust gas passing through the high pressure boiler in series.
ラの発生蒸気により駆動される混気タービンを備えてな
る請求項１記載の廃棄物焼却炉の排ガス処理システム。2. The exhaust gas treatment system for a waste incinerator according to claim 1, further comprising an air-fuel mixture turbine driven by the steam generated by the high-pressure boiler and the steam generated by the low-pressure boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36212797A JP3519590B2 (en) | 1997-12-11 | 1997-12-11 | Exhaust gas treatment method for waste incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36212797A JP3519590B2 (en) | 1997-12-11 | 1997-12-11 | Exhaust gas treatment method for waste incinerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11173539A true JPH11173539A (en) | 1999-06-29 |
| JP3519590B2 JP3519590B2 (en) | 2004-04-19 |
Family
ID=18475995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36212797A Expired - Lifetime JP3519590B2 (en) | 1997-12-11 | 1997-12-11 | Exhaust gas treatment method for waste incinerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3519590B2 (en) |
-
1997
- 1997-12-11 JP JP36212797A patent/JP3519590B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3519590B2 (en) | 2004-04-19 |
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