JPH0252526B2 - - Google Patents
Info
- Publication number
- JPH0252526B2 JPH0252526B2 JP59021286A JP2128684A JPH0252526B2 JP H0252526 B2 JPH0252526 B2 JP H0252526B2 JP 59021286 A JP59021286 A JP 59021286A JP 2128684 A JP2128684 A JP 2128684A JP H0252526 B2 JPH0252526 B2 JP H0252526B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- catalyst
- deodorizing
- incinerator
- incinerator exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003054 catalyst Substances 0.000 claims description 32
- 230000001877 deodorizing effect Effects 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 17
- 239000000428 dust Substances 0.000 claims description 13
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 12
- 230000003197 catalytic effect Effects 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 11
- 239000010802 sludge Substances 0.000 claims description 10
- 238000004332 deodorization Methods 0.000 claims description 9
- 229910052697 platinum Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000012719 wet electrostatic precipitator Substances 0.000 description 5
- 239000003513 alkali Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000009841 combustion method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004868 gas analysis Methods 0.000 description 2
- 239000002574 poison Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000010718 Oxidation Activity Effects 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Description
〔産業上の利用分野〕
本発明は、汚泥焼却炉排ガスを経済的に脱臭す
る方法に関するものである。
〔従来の技術〕
従来、汚泥焼却炉排ガスの脱臭方法としては、
一般に、直接燃焼方式または酸・アルカリ洗浄方
式（薬液洗浄方式）が用いられてる。しかし直接
燃焼方式は処理効果は良好であるが、助燃料を多
く必要とし経済的な面で大きな問題があり、一
方、酸・アルカリ洗浄方式は、処理効果の面で厳
しい二次公害規制に対しては対応が困難な場合が
ある。
これらの問題に対応すべく、触媒の低温酸化活
性を利用した触媒脱臭法の採用が検討されてい
る。触媒脱臭法を組み込んだ排ガス処理のフロー
としては、第１図のものが考えられる。すなわ
ち、多段焼却炉１などの焼却炉から排出される排
ガスは、洗浄塔２に導入されて希NaOH水溶液
と接触して洗浄され、ついで湿式電気集塵機３に
送られて集塵された後、熱交換器４で後述の触媒
脱臭装置６からの高温排ガスと接触して予熱さ
れ、さらに加熱炉５で触媒脱臭に適する温度に加
熱され、触媒を充填した触媒脱臭装置６に導入さ
れる。触媒脱臭装置６からの高温排ガスは、前述
のように熱交換器４に送られて、湿式電気集塵機
３からの排ガスを予熱した後、煙突７から大気放
出される。多段焼却炉１の軸冷空気は、白煙防止
用空気として煙突７の前に供給される。
また、特開昭58−214323号公報には、多段式汚
泥焼却炉からの排ガスを、冷却塔、アルカリ洗浄
塔および湿式電気集塵機で処理した後、熱交換
器、加熱器を通し、ついで触媒を充填した酸化反
応器で処理する排ガスの処理方法が開示されてい
る。
〔発明が解決しようとする課題〕
しかし、第１図に示すフローでは、排ガスを一
度洗浄塔２で冷却した後、再び加熱炉５により昇
温しなければならいためエネルギー的に損失が大
きく、また熱回収を図るためフローが複雑になる
という不都合点がある。
また、特開昭58−214323号公報記載の排ガスの
処理方法も、第１図の場合と同様の不都合点を有
している。
本発明者らは、汚泥焼却炉排ガス中のSOx濃度
が比較的低濃度であるという点に着目し、排ガス
中の硫黄分が白金などの脱臭触媒にとつて決定的
な触媒毒とならず、触媒層流入前に乾式集塵機に
よりダスト等を除去して触媒毒を低減させること
により、触媒寿命を第１図および特開昭58−
214323号公報に示すフローと同程度保持可能なま
ま、著しくエネルギー効率を高めることができる
ことを知見した。
本発明は上記の緒点に鑑みなされたもので、排
ガス温度を下げることなく触媒層まで導入するた
め、脱臭のために必要な昇温はごくわずかとな
り、このため経済的に脱臭することができる汚泥
焼却炉排ガスの脱臭方法を提供することを目的と
するものである。
〔課題を解決するための手段および作用〕
上記の目的を達成するために、本発明の汚泥焼
却炉排ガスの脱臭方法は、第２図に示すように、
臭気成分を含む250〜400℃の汚泥焼却炉排ガスを
触媒により脱臭する方法において、焼却炉排ガス
を乾式集塵機８に導入して除塵した後、触媒脱臭
装置１０の触媒層を通して脱臭し、ついで洗浄塔
１１に導入してSOxを主とする有害物質を吸収・
除去するとともに、焼却炉排ガスを冷却すること
を特徴とするものである。
脱臭のための触媒としては、ハニカム型の白金
系触媒を使用するのが望ましい。
多段焼却炉１などの焼却炉から排出される排ガ
スは、乾式電気集塵機または移動床式集塵機など
の乾式集塵機８により集塵され、加熱炉９により
若干昇温された後、触媒脱臭装置１０を通過して
脱臭される。その後、洗浄塔１１で希NaOH水
溶液と接触してSOxを主とする有害物質が吸収・
除去されるともに、冷却されて煙突７から排出さ
れる。多段焼却炉１の軸冷空気は白煙防止用空気
として煙突７の前に供給される。触媒としては、
前述のように、ハニカム型の白金系触媒を用いる
のが望ましい。また乾式集塵機８出口の温度が、
触媒脱臭装置１０に必要な高温（350℃以上）で
ある場合は、加熱炉９を使用しなくてよい。すな
わち、焼却炉１出口排ガス温度を350〜380℃程度
にコントロールすることにより、脱臭のために加
熱する必要はなくなり、乾式集塵後、直ちに触媒
脱臭装置１０を通し脱臭することが可能となる。
〔実施例〕
つぎに本発明の実施例および比較例について説
明する。
実施例 １
第１表に示す組成の多段焼却炉排ガスを、第２
図に示すフローに従つて処理した。排ガス処理量
は120Nm3／ｈ、排ガス温度は350℃、乾式集塵機
出口温度は300℃、加熱炉出口温度は350℃、触媒
はハニカム型の白金系触媒を使用し、触媒脱臭装
置出口温度は350℃、洗浄塔出口温度は40℃であ
つた。触媒脱臭装置出口の排ガス分析結果は第１
表の如くであつた。
比較例 １
実施例１と同じ排ガスを、第１図に示すフロー
に従つて処理した。排ガス処理量は120Nm3／ｈ、
排ガス温度は350℃、洗浄塔出口温度は40℃、湿
式電気集塵機出口温度は40℃、熱交換器出口（加
熱炉入口）温度は180℃、加熱炉出口温度は350
℃、触媒はハニカム型の白金系触媒を使用し、触
媒脱臭装置出口温度は350℃、熱交換器出口温度
は250℃であつた。触媒脱臭装置出口の排ガス分
析結果は第１表の如くであつた。
[Industrial Field of Application] The present invention relates to a method for economically deodorizing sludge incinerator exhaust gas. [Conventional technology] Conventionally, as a method for deodorizing sludge incinerator exhaust gas,
Generally, a direct combustion method or an acid/alkali cleaning method (chemical cleaning method) is used. However, although the direct combustion method has a good treatment effect, it requires a large amount of auxiliary fuel and has a big economical problem.On the other hand, the acid/alkali cleaning method does not meet strict secondary pollution regulations in terms of treatment effect. In some cases, it may be difficult to respond. In order to address these problems, the adoption of catalytic deodorization methods that utilize the low-temperature oxidation activity of catalysts is being considered. A possible exhaust gas treatment flow that incorporates the catalytic deodorization method is shown in Figure 1. That is, the exhaust gas discharged from an incinerator such as the multi-stage incinerator 1 is introduced into a cleaning tower 2 where it is cleaned by contacting with a dilute NaOH aqueous solution, and then sent to a wet electrostatic precipitator 3 where it is collected and then heated. It is preheated in the exchanger 4 by contacting high-temperature exhaust gas from a catalytic deodorizing device 6 (described later), further heated in the heating furnace 5 to a temperature suitable for catalytic deodorizing, and introduced into the catalytic deodorizing device 6 filled with a catalyst. The high-temperature exhaust gas from the catalyst deodorizing device 6 is sent to the heat exchanger 4 as described above, and after preheating the exhaust gas from the wet electrostatic precipitator 3, it is released into the atmosphere from the chimney 7. The shaft-cooled air of the multistage incinerator 1 is supplied in front of the chimney 7 as white smoke prevention air. Furthermore, in Japanese Patent Application Laid-Open No. 58-214323, exhaust gas from a multistage sludge incinerator is treated with a cooling tower, an alkali washing tower, and a wet electrostatic precipitator, then passed through a heat exchanger and a heater, and then treated with a catalyst. A method for treating exhaust gas in a packed oxidation reactor is disclosed. [Problems to be Solved by the Invention] However, in the flow shown in FIG. 1, the exhaust gas must be cooled once in the cleaning tower 2 and then heated again in the heating furnace 5, resulting in a large energy loss. There is a disadvantage that the flow becomes complicated in order to recover heat. Furthermore, the exhaust gas treatment method described in Japanese Patent Application Laid-Open No. 58-214323 also has the same disadvantages as the case shown in FIG. The present inventors focused on the fact that the SOx concentration in the sludge incinerator exhaust gas is relatively low, and the sulfur content in the exhaust gas does not become a decisive catalyst poison for deodorizing catalysts such as platinum. By removing dust etc. with a dry dust collector before entering the catalyst layer and reducing catalyst poison, the life of the catalyst can be extended as shown in Figure 1 and JP-A-1988-
It has been found that energy efficiency can be significantly increased while maintaining the same flow as shown in Publication No. 214323. The present invention was developed in view of the above-mentioned points, and since the exhaust gas is introduced to the catalyst layer without lowering the temperature, the temperature increase required for deodorization is negligible, making it possible to deodorize economically. The purpose of this invention is to provide a method for deodorizing sludge incinerator exhaust gas. [Means and effects for solving the problem] In order to achieve the above object, the method for deodorizing sludge incinerator exhaust gas of the present invention, as shown in FIG.
In a method of deodorizing sludge incinerator exhaust gas at 250 to 400°C containing odor components using a catalyst, the incinerator exhaust gas is introduced into a dry dust collector 8 to remove dust, and then deodorized through a catalyst layer of a catalytic deodorizer 10, and then transferred to a cleaning tower. 11 to absorb and absorb harmful substances mainly SOx.
This system is characterized by removing incinerator exhaust gas and cooling the incinerator exhaust gas. As the catalyst for deodorization, it is desirable to use a honeycomb type platinum catalyst. Exhaust gas discharged from an incinerator such as the multistage incinerator 1 is collected by a dry dust collector 8 such as a dry electric dust collector or a moving bed dust collector, and after being slightly heated by a heating furnace 9, it passes through a catalytic deodorizing device 10. It is then deodorized. After that, in the cleaning tower 11, it comes into contact with a dilute NaOH aqueous solution to absorb and absorb harmful substances, mainly SOx.
It is removed, cooled and discharged from the chimney 7. The shaft-cooled air of the multistage incinerator 1 is supplied in front of the chimney 7 as white smoke prevention air. As a catalyst,
As mentioned above, it is desirable to use a honeycomb type platinum catalyst. In addition, the temperature of the dry dust collector 8 outlet is
If the temperature is high (350° C. or higher) required for the catalyst deodorizing device 10, the heating furnace 9 may not be used. That is, by controlling the exhaust gas temperature at the incinerator 1 outlet to about 350 to 380°C, there is no need to heat for deodorization, and it becomes possible to immediately deodorize the exhaust gas through the catalytic deodorization device 10 after dry dust collection. [Example] Next, Examples and Comparative Examples of the present invention will be described. Example 1 Multi-stage incinerator exhaust gas having the composition shown in Table 1 was
The process was performed according to the flow shown in the figure. The exhaust gas processing amount is 120Nm 3 /h, the exhaust gas temperature is 350℃, the dry dust collector outlet temperature is 300℃, the heating furnace outlet temperature is 350℃, the catalyst uses a honeycomb type platinum catalyst, and the catalyst deodorization device outlet temperature is 350℃. ℃, and the cleaning tower outlet temperature was 40℃. The exhaust gas analysis result at the outlet of the catalyst deodorizing equipment is the first
It was as shown in the table. Comparative Example 1 The same exhaust gas as in Example 1 was treated according to the flow shown in FIG. Exhaust gas processing amount is 120Nm 3 /h,
Exhaust gas temperature is 350℃, cleaning tower outlet temperature is 40℃, wet electrostatic precipitator outlet temperature is 40℃, heat exchanger outlet (heating furnace inlet) temperature is 180℃, heating furnace outlet temperature is 350℃
℃, a honeycomb-type platinum-based catalyst was used, the catalyst deodorizer outlet temperature was 350℃, and the heat exchanger outlet temperature was 250℃. The exhaust gas analysis results at the outlet of the catalyst deodorizing device were as shown in Table 1.
本発明は上記のように構成されているので、つ
ぎのような効果を奏する。
(1) 排ガス温度を下げることなく、触媒層まで排
ガスを導入できるので、エネルギー損失が少な
く、このため、脱臭に要する助燃料が少なくて
済み、ランニングコストも第１図に示す従来の
フローに比べて安価になる。なお、本発明者ら
の実験によれば、燃料費、触媒費などを含めた
ランニングコストは、本発明の方法の方が、第
１図に示すフローより、約30％安価になるとい
う結果を得た。
(2) 熱回収を積極的に図る必要がないため、熱交
換器を必要としなくなり、フローが簡単かつ確
実なものになる。
(3) 触媒層入口排ガス屋度が、適切な範囲に入る
ように、焼却炉運転状態により容易に制御する
ことができる。
Since the present invention is configured as described above, it has the following effects. (1) Since the exhaust gas can be introduced to the catalyst layer without lowering the exhaust gas temperature, there is less energy loss, so less auxiliary fuel is required for deodorization, and the running cost is lower than the conventional flow shown in Figure 1. It becomes cheaper. Furthermore, according to experiments conducted by the present inventors, the running costs, including fuel costs, catalyst costs, etc., are approximately 30% cheaper with the method of the present invention than with the flow shown in Figure 1. Obtained. (2) Since there is no need to actively recover heat, there is no need for a heat exchanger, making the flow simple and reliable. (3) The exhaust gas level at the inlet of the catalyst bed can be easily controlled by the incinerator operating conditions so that it falls within an appropriate range.
第１図は触媒脱臭装置を組み込んだ一般的なフ
ローの説明図、第２図は本発明の一実施例を示す
系統的説明図である。
１……多段焼却炉、２……洗浄塔、３……湿式
電気集塵機、４……熱交換器、５……加熱炉、６
……触媒脱臭装置、７……煙突、８……乾式集塵
機、９……加熱炉、１０……触媒脱臭装置、１１
……洗浄塔。
FIG. 1 is an explanatory diagram of a general flow incorporating a catalyst deodorizing device, and FIG. 2 is a systematic explanatory diagram showing one embodiment of the present invention. 1...Multi-stage incinerator, 2...Washing tower, 3...Wet electrostatic precipitator, 4...Heat exchanger, 5...Heating furnace, 6
... Catalytic deodorizing device, 7... Chimney, 8... Dry dust collector, 9... Heating furnace, 10... Catalytic deodorizing device, 11
...Cleaning tower.
Claims (1)
スを触媒により脱臭する方法において、焼却炉排
ガスを乾式集塵機８に導入して除塵した後、触媒
脱臭装置１０の触媒層を通して脱臭し、ついで洗
浄塔１１に導入してSOxを主とする有害物質を吸
収・除去するとともに、焼却炉排ガスを冷却する
ことを特徴とする汚泥焼却炉排ガスの脱臭方法。 ２ 脱臭のための触媒が、ハニカム型の白金系触
媒である特許請求の範囲第１項記載の汚泥焼却炉
排ガスの脱臭方法。[Scope of Claims] 1. In a method of deodorizing sludge incinerator exhaust gas at 250 to 400°C containing odor components using a catalyst, after the incinerator exhaust gas is introduced into a dry dust collector 8 to remove dust, the catalyst layer of the catalytic deodorizing device 10 A method for deodorizing sludge incinerator exhaust gas, which is characterized by deodorizing the incinerator exhaust gas through a cleaning tower 11, absorbing and removing harmful substances mainly including SOx, and cooling the incinerator exhaust gas. 2. The method for deodorizing sludge incinerator exhaust gas according to claim 1, wherein the catalyst for deodorization is a honeycomb-type platinum-based catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59021286A JPS60166021A (en) | 1984-02-07 | 1984-02-07 | Deodorization of waste gas from sludge incinerating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59021286A JPS60166021A (en) | 1984-02-07 | 1984-02-07 | Deodorization of waste gas from sludge incinerating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60166021A JPS60166021A (en) | 1985-08-29 |
| JPH0252526B2 true JPH0252526B2 (en) | 1990-11-13 |
Family
ID=12050886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59021286A Granted JPS60166021A (en) | 1984-02-07 | 1984-02-07 | Deodorization of waste gas from sludge incinerating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60166021A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0694029B2 (en) * | 1989-03-20 | 1994-11-24 | 荏原インフイルコ株式会社 | Ammonia-containing wastewater treatment method |
| JP4671391B2 (en) * | 2004-05-06 | 2011-04-13 | 株式会社タクマ | Exhaust gas cleaning system and cleaning method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58214323A (en) * | 1982-06-04 | 1983-12-13 | Mitsui Eng & Shipbuild Co Ltd | Treatment of exhaust gas |
-
1984
- 1984-02-07 JP JP59021286A patent/JPS60166021A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58214323A (en) * | 1982-06-04 | 1983-12-13 | Mitsui Eng & Shipbuild Co Ltd | Treatment of exhaust gas |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60166021A (en) | 1985-08-29 |
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