JPH01115437A - Method for drying effluent water after scrubbing - Google Patents
Method for drying effluent water after scrubbingInfo
- Publication number
- JPH01115437A JPH01115437A JP62271663A JP27166387A JPH01115437A JP H01115437 A JPH01115437 A JP H01115437A JP 62271663 A JP62271663 A JP 62271663A JP 27166387 A JP27166387 A JP 27166387A JP H01115437 A JPH01115437 A JP H01115437A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- incinerator
- smoke
- smoke washing
- drying
- 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
- 238000001035 drying Methods 0.000 title claims abstract description 20
- 238000005201 scrubbing Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 8
- 239000007921 spray Substances 0.000 claims abstract description 18
- 239000000779 smoke Substances 0.000 claims description 59
- 238000005406 washing Methods 0.000 claims description 52
- 239000007789 gas Substances 0.000 claims description 40
- 239000002351 wastewater Substances 0.000 claims description 38
- 239000002912 waste gas Substances 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 abstract description 14
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract description 2
- 235000002639 sodium chloride Nutrition 0.000 description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000003303 reheating Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- -1 common salt Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、ごみ焼却炉から発生する焼却炉排ガスを洗煙
塔で洗浄して有害ガスを吸収した洗煙排水を乾燥し、洗
煙排水中の塩類を固体の状態にし”ζ回収する方法に関
する。[Detailed Description of the Invention] [Industrial Application Field] The present invention cleans incinerator exhaust gas generated from a garbage incinerator in a smoke washing tower and dries the smoke washing wastewater that has absorbed harmful gases. It relates to a method for converting salts in a solid state and recovering them.
［従来技術］
ごみ焼却炉から発生する焼却炉排ガス中には塩化水素や
硫黄酸化物等の有害ガスが含まれているため、有害ガス
の除去処理が行われるが、その処理方法の多くは苛性ソ
ーダを添加した液で洗浄する湿式洗煙法が採用されてい
る。湿式洗煙法においては、前記有害ガスと苛性ソーダ
の反応によって生成した食塩を主とする塩類が溶解され
た洗煙排水を排出する。この洗煙排水中の塩類の回収方
法としては、重金属を除去したのち、乾燥して固体の状
態にする方法が一部に行われている。[Prior art] The incinerator exhaust gas generated from garbage incinerators contains harmful gases such as hydrogen chloride and sulfur oxides, so the harmful gases are removed, but most of the processing methods use caustic soda. A wet smoke cleaning method is used to clean with a liquid containing . In the wet smoke washing method, smoke washing waste water in which salts, mainly common salt, produced by the reaction between the harmful gas and caustic soda is dissolved is discharged. Some methods for recovering salts from this smoke washing wastewater include removing heavy metals and then drying it to a solid state.
従来の洗煙排水の乾燥は第２図に示されている方法で行
われている。第２図は洗煙排水の乾燥工程を備えなごみ
焼却炉排ガス処理プラントの説明図である。第２図にお
いて、ごみ焼却炉１１から発生する焼却炉排ガス１２は
廃熱ボイラ１３で熱回収されて蒸気１４を発生させ、電
気集塵機１５で除塵されたのち洗煙塔１６に送られて有
害ガスが除去される。洗煙塔１６から排出した洗煙塔排
ガス１７は温度６０〜７０℃で湿度が飽和状態のガスで
あるので、大気放出時の白煙を防止するために、再加熱
部１８において、廃熱ボイラ１３で発生させた蒸気１４
との熱交換によって２００℃前後に加熱された空気１９
が混合されて、約１２０℃以上に昇温され、大気放出す
る。このような、ごみ焼却炉排ガスの処理工程番こおい
て、前記洗煙塔１６からは洗煙排水１が排出する。この
洗煙排水１は重金属処理装置２０で重金属類を除去され
たのち、ドラムドライヤー２１に送られる。このドラム
ドライヤー２１は特開昭５８−２７６０１、特開昭６０
−２８８０１等に開示されているように、回転し、かつ
加熱されたドラムの表面に液状乾燥物を薄膜状に付着さ
せ、回転中に乾燥させる装置である。このような−ドラ
ムドライヤー２１では、廃熱ボイラ１３で発生し叱蒸気
の一部２２をドラム２３の内部に供給してドラム２３を
加熱し、この加熱されたドラム２３の表面に洗煙排水１
を供給す−る。ドラムドライヤー２１に供給された洗煙
排水１は水分が蒸発して乾燥され、洗煙排水１中の塩類
は粉末状になって落下する。この際、ドラムドライヤー
２１からは洗煙排水１の水分の蒸発による水蒸気および
塩類のミストが発生するので、雰囲気ガスを強制排気し
、この排ガス２４を洗煙塔１６に送って焼却炉排ガス１
１とともに洗浄処理を行う。Conventionally, drying of smoke washing waste water is carried out by the method shown in FIG. FIG. 2 is an explanatory diagram of a garbage incinerator exhaust gas treatment plant equipped with a drying process for smoke washing wastewater. In Fig. 2, incinerator exhaust gas 12 generated from a garbage incinerator 11 is heat-recovered in a waste heat boiler 13 to generate steam 14, and after being removed by an electrostatic precipitator 15, it is sent to a smoke scrubbing tower 16 to generate harmful gas. is removed. The smoke scrubbing tower flue gas 17 discharged from the smoke scrubbing tower 16 is a gas with a temperature of 60 to 70°C and a saturated humidity state, so in order to prevent white smoke from being released into the atmosphere, a waste heat boiler is used in the reheating section 18. Steam 14 generated in 13
Air heated to around 200℃ by heat exchange with
are mixed, heated to about 120°C or higher, and released into the atmosphere. In this process of treating waste incinerator exhaust gas, smoke washing waste water 1 is discharged from the smoke washing tower 16. This smoke washing wastewater 1 is sent to a drum dryer 21 after heavy metals are removed by a heavy metal processing device 20 . This drum dryer 21 is JP-A-58-27601 and JP-A-60.
As disclosed in Japanese Patent Application No. 28801, etc., this is an apparatus in which a liquid dried material is deposited in a thin film on the surface of a rotating and heated drum, and is dried during rotation. In such a drum dryer 21, a part 22 of scolding steam generated in the waste heat boiler 13 is supplied to the inside of the drum 23 to heat the drum 23, and the smoke cleaning waste water 1 is applied to the surface of the heated drum 23.
supply. The smoke washing wastewater 1 supplied to the drum dryer 21 is dried by evaporating water, and the salts in the smoke washing wastewater 1 fall in the form of powder. At this time, water vapor and salt mist are generated from the drum dryer 21 due to the evaporation of moisture in the smoke washing waste water 1, so the atmospheric gas is forcibly exhausted and this waste gas 24 is sent to the smoke washing tower 16, and the incinerator waste gas 1 is sent to the smoke washing tower 16.
A cleaning process is performed together with 1.
［発明が解決しとうとする問題点］ しかし、前述の従来技術には次のような問題点がある。[Problem that the invention attempts to solve] However, the above-mentioned conventional technology has the following problems.
従来の方法においては、洗煙排水をドラムドライヤーで
蒸発させて乾燥しているが、このドラムドライヤーは腐
食性の塩類を含む洗煙排水との接触部分が多く、また、
乾燥中に発生する塩類のミストにも曝される環境で使用
されるので、腐食の度合いが大きく、耐用年数は非常に
短い。In the conventional method, smoke washing wastewater is evaporated and dried using a drum dryer, but this drum dryer has many parts that come into contact with smoke washing wastewater containing corrosive salts, and
Because they are used in environments where they are exposed to salt mist generated during drying, they are highly corrosive and have a very short service life.
また、ドラムドライヤーから発生する水蒸気やミストを
排気する際には、多量の空気も吸引し、この排ガス量は
焼却炉排ガスに対し１０％以上にもなる。したがって、
洗煙塔から排出する洗煙塔排ガスのガス量は洗煙排水処
理装置を設置しない場合より増加し、再加熱部における
加熱熱量が増加する。更に、ドラムドライヤーに導入す
る洗煙排水の乾燥熱源としてはコストの高い蒸気が使用
される。Further, when exhausting water vapor and mist generated from the drum dryer, a large amount of air is also sucked in, and the amount of this exhaust gas is more than 10% of the incinerator exhaust gas. therefore,
The amount of smoke-washing tower flue gas discharged from the smoke-washing tower increases compared to the case where no smoke-washing wastewater treatment device is installed, and the amount of heating heat in the reheating section increases. Furthermore, expensive steam is used as a heat source for drying the smoke washing wastewater introduced into the drum dryer.
本発明は、このような従来技術の問題点を解決するため
になされたものであり、乾燥機の腐食がなく、再加熱部
における加熱熱量が節減でき、洗煙排水の乾燥熱源には
蒸気を使用しない洗煙排水の乾燥方法を提供することを
目的とする。The present invention was made in order to solve the problems of the conventional technology, and there is no corrosion in the dryer, the amount of heating heat in the reheating section can be reduced, and steam is used as the drying heat source for the smoke washing wastewater. The purpose of the present invention is to provide a method for drying unused smoke washing waste water.
［問題点を解決するための手段］
本発明は、ごみ焼却炉から発生する焼却炉排ガスを洗煙
塔で洗浄して有害ガスを吸収した洗煙排水の乾燥方法に
おいて、前記洗煙排水を噴霧乾燥機に供給し、この噴霧
乾燥機に前記焼却炉排ガスの一部を導入して前記洗煙排
水を乾燥し、前記噴霧乾燥機から排出する乾燥機排ガス
を洗煙塔に送り、前記焼却炉排ガスの残部とともに有害
ガスの除去処理を行うことを特徴とする洗煙排水の乾燥
方法である。[Means for Solving the Problems] The present invention provides a method for drying smoke washing wastewater obtained by washing incinerator exhaust gas generated from a waste incinerator in a smoke washing tower and absorbing harmful gases, in which the smoke washing wastewater is atomized. A part of the incinerator exhaust gas is introduced into the spray dryer to dry the smoke washing wastewater, and the dryer exhaust gas discharged from the spray dryer is sent to the smoke washing tower, and a part of the incinerator exhaust gas is introduced into the spray dryer. This is a method for drying smoke washing wastewater, which is characterized in that harmful gases are removed along with the remainder of the exhaust gas.
［作用］
噴霧乾燥機は液状の被乾燥物を高温の気流中に噴霧して
、噴霧された液滴を乾燥させる装置であるので、洗煙排
水は噴霧すると瞬時に乾燥される。このため、腐食を惹
起する条件である湿潤状態になる装置の部分は噴霧器等
の極く一部に限定される。また、洗煙排水の乾燥熱源に
は焼却炉排ガスを導入するので、洗煙塔排ガスのガス量
増加がなくなり、したがって、再加熱部における洗煙塔
排ガスの加熱熱量も増加しない。[Function] Since a spray dryer is a device that sprays a liquid material to be dried into a high-temperature air stream and dries the sprayed droplets, the smoke washing wastewater is instantly dried when sprayed. For this reason, the parts of the apparatus that become wet, which is a condition that causes corrosion, are limited to only a few parts, such as the sprayer. Furthermore, since the incinerator exhaust gas is introduced into the drying heat source of the smoke washing wastewater, there is no increase in the gas amount of the smoke washing tower exhaust gas, and therefore, the amount of heating heat for the smoke washing tower exhaust gas in the reheating section does not increase.
［実施例］
以下、本発明の実施例を図面に基づいて説明する。第１
図は本発明の一実施例を示す説明図である。第１図にお
いて、従来技術の説明図である第２図と同じ部分は同一
の符号を付し説明を省略する０本実施例においては、洗
煙塔１６から排出し重金属処理装置２０で重金属類が除
去された洗煙排水１は噴霧乾燥機２に供給される。この
噴霧乾燥機２はディスク式であり、下部が円錐形状にな
っている乾燥槽の上部に高速回転するディスクが設けら
れ、このディスクに洗煙排水１が供給されて噴霧される
。乾燥熱源としては、ごみ焼却炉１１から発生する焼却
炉排ガスエ２の一部３が導入される。噴霧された洗煙排
水は瞬時に乾燥され、洗煙排水中の塩類は粉末状になる
。粉末状になった塩類４は落下し、噴霧乾燥機２の底部
から排出する。一方洗煙排水１を乾燥した乾燥機排ガス
５は、集塵機６で塩類の微粉が除去されたのち前記焼却
炉排ガスの残部とともに洗煙塔１６に送られ、有害ガス
が除去される。[Example] Hereinafter, an example of the present invention will be described based on the drawings. 1st
The figure is an explanatory diagram showing one embodiment of the present invention. In FIG. 1, the same parts as in FIG. 2, which is an explanatory diagram of the prior art, are given the same reference numerals and their explanations are omitted. The smoke washing wastewater 1 from which the smoke has been removed is supplied to a spray dryer 2. This spray dryer 2 is of a disk type, and a disk rotating at high speed is provided at the top of a drying tank having a conical bottom, and the smoke cleaning waste water 1 is supplied to this disk and sprayed thereon. A portion 3 of the incinerator exhaust gas 2 generated from the waste incinerator 11 is introduced as a dry heat source. The sprayed smoke washing wastewater is instantly dried, and the salts in the smoke washing wastewater are turned into powder. The powdered salts 4 fall and are discharged from the bottom of the spray dryer 2. On the other hand, the dryer exhaust gas 5 obtained by drying the smoke washing wastewater 1 is sent to a smoke washing tower 16 together with the remainder of the incinerator exhaust gas after removing fine salt powder in a dust collector 6, where harmful gases are removed.
なお、本発明は実施例に示された態様に限定されるもの
ではなく、例えば、・噴霧乾燥機２はノズル式の噴霧器
を備えたものであってもよい。Note that the present invention is not limited to the embodiments shown in the embodiments; for example, the spray dryer 2 may be equipped with a nozzle type sprayer.
［発明の効果］
本発明においては、洗煙排水の乾燥（こ噴霧乾燥機を配
置するので、供給した洗煙排水は瞬時に乾燥される。こ
のため、塩類のミストの生成もなく、また、噴霧乾燥機
内は乾燥状態で保たれ、湿潤状態のまま腐食性の塩類と
接触する装置部分は洗煙排水を噴霧する噴霧器の一部分
だけであり、装置の腐食はほとんどなくなる。また、コ
ストの高い蒸気を使用せず、洗煙排水の乾燥熱源には焼
却炉排ガスの一部を分岐して導入するので、洗煙塔排ガ
スのガス量増加がなく、したがって、再加熱部における
洗煙塔排ガスの加熱熱量も増加しない。[Effects of the Invention] In the present invention, since a spray dryer is installed for drying the smoke washing wastewater, the supplied smoke washing wastewater is instantly dried.Therefore, no salt mist is generated, and The interior of the spray dryer is kept dry, and the only part of the equipment that comes into contact with corrosive salts while still wet is the sprayer that sprays the smoke cleaning wastewater, which almost eliminates corrosion of the equipment. Since a part of the incinerator exhaust gas is branched and introduced into the drying heat source of the smoke washing wastewater, there is no increase in the amount of smoke washing tower exhaust gas, and therefore the heating of the smoke washing tower exhaust gas in the reheating section is reduced. The amount of heat does not increase either.
このように、本発明は乾燥機の腐食問題を解決し、また
、熱エネルギーを大幅に節減するとともに洗煙排水の乾
燥コストを低減できる極めて有用の方法である。Thus, the present invention is an extremely useful method that can solve the dryer corrosion problem, significantly save thermal energy, and reduce the cost of drying smoke wastewater.
第１図は本発明の一実施例を示す説明図、第２図は従来
技術の説明図である。
１・・・洗煙排水、２・・・噴霧乾燥機、３・・・焼却
炉排ガスの一部、４・・・粉末の塩類、５・・・乾燥
機排ガス、１１・・・ごみ焼却炉、１２・・・焼却炉排
ガス。
１６・・・洗煙塔、１７・・・洗煙塔排ガス 、１８・
・・再加熱部。FIG. 1 is an explanatory diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional technique. 1... Smoke washing waste water, 2... Spray dryer, 3... Part of incinerator exhaust gas, 4... Powdered salts, 5... Drying
Machine exhaust gas, 11... Garbage incinerator, 12... Incinerator exhaust gas. 16... Smoke washing tower, 17... Smoke washing tower exhaust gas, 18.
...Reheating section.
Claims (1)
して有害ガスを吸収した洗煙排水の乾燥方法において、
前記洗煙排水を噴霧乾燥機に供給し、この噴霧乾燥機に
前記焼却炉排ガスの一部を導入して前記洗煙排水を乾燥
し、前記噴霧乾燥機から排出する乾燥機排ガスを洗煙塔
に送り、前記焼却炉排ガスの残部とともに有害ガスの除
去処理を行うことを特徴とする洗煙排水の乾燥方法。In a method for drying incinerator exhaust gas generated from a garbage incinerator using a smoke scrubbing tower to absorb harmful gases,
The smoke washing wastewater is supplied to a spray dryer, a part of the incinerator exhaust gas is introduced into the spray dryer to dry the smoke washing wastewater, and the dryer waste gas discharged from the spray dryer is sent to a smoke washing tower. A method for drying smoke washing wastewater, characterized in that the smoke washing wastewater is sent to the wastewater and subjected to a treatment for removing harmful gases together with the remainder of the incinerator exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62271663A JPH0626648B2 (en) | 1987-10-29 | 1987-10-29 | Method of drying smoke washing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62271663A JPH0626648B2 (en) | 1987-10-29 | 1987-10-29 | Method of drying smoke washing wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01115437A true JPH01115437A (en) | 1989-05-08 |
| JPH0626648B2 JPH0626648B2 (en) | 1994-04-13 |
Family
ID=17503156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62271663A Expired - Lifetime JPH0626648B2 (en) | 1987-10-29 | 1987-10-29 | Method of drying smoke washing wastewater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0626648B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101334290B1 (en) | 2009-11-02 | 2013-11-29 | 사에스 스마트 머티리얼즈 | Ni-Ti SEMI-FINISHED PRODUCTS AND RELATED METHODS |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5243624A (en) * | 1975-09-25 | 1977-04-05 | Kubota Ltd | Tension clutch operating mechanism |
-
1987
- 1987-10-29 JP JP62271663A patent/JPH0626648B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5243624A (en) * | 1975-09-25 | 1977-04-05 | Kubota Ltd | Tension clutch operating mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0626648B2 (en) | 1994-04-13 |
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